/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- * vim: set ts=4 sw=4 et tw=99: * * ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is Mozilla SpiderMonkey JavaScript 1.9 code, released * May 28, 2008. * * The Initial Developer of the Original Code is * Brendan Eich * * Contributor(s): * Andreas Gal * Mike Shaver * David Anderson * * Alternatively, the contents of this file may be used under the terms of * either of the GNU General Public License Version 2 or later (the "GPL"), * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ #include "jsstdint.h" #include "jsbit.h" // low-level (NSPR-based) headers next #include "jsprf.h" #include // standard headers next #if defined(_MSC_VER) || defined(__MINGW32__) #include #ifdef _MSC_VER #define alloca _alloca #endif #endif #ifdef SOLARIS #include #endif #include #include "nanojit/nanojit.h" #include "jsapi.h" // higher-level library and API headers #include "jsarray.h" #include "jsbool.h" #include "jscntxt.h" #include "jsdbgapi.h" #include "jsemit.h" #include "jsfun.h" #include "jsinterp.h" #include "jsiter.h" #include "jsobj.h" #include "jsopcode.h" #include "jsregexp.h" #include "jsscope.h" #include "jsscript.h" #include "jsdate.h" #include "jsstaticcheck.h" #include "jstracer.h" #include "jsxml.h" #include "jsautooplen.h" // generated headers last #include "imacros.c.out" #if JS_HAS_XML_SUPPORT #define ABORT_IF_XML(v) \ JS_BEGIN_MACRO \ if (!JSVAL_IS_PRIMITIVE(v) && OBJECT_IS_XML(BOGUS_CX, JSVAL_TO_OBJECT(v)))\ ABORT_TRACE("xml detected"); \ JS_END_MACRO #else #define ABORT_IF_XML(cx, v) ((void) 0) #endif /* Never use JSVAL_IS_BOOLEAN because it restricts the value (true, false) and the type. What you want to use is JSVAL_TAG(x) == JSVAL_BOOLEAN and then handle the undefined case properly (bug 457363). */ #undef JSVAL_IS_BOOLEAN #define JSVAL_IS_BOOLEAN(x) JS_STATIC_ASSERT(0) JS_STATIC_ASSERT(sizeof(JSTraceType) == 1); /* Map to translate a type tag into a printable representation. */ static const char typeChar[] = "OIDXSNBF"; static const char tagChar[] = "OIDISIBI"; /* Blacklist parameters. */ /* Number of iterations of a loop where we start tracing. That is, we don't start tracing until the beginning of the HOTLOOP-th iteration. */ #define HOTLOOP 2 /* Attempt recording this many times before blacklisting permanently. */ #define BL_ATTEMPTS 2 /* Skip this many hits before attempting recording again, after an aborted attempt. */ #define BL_BACKOFF 32 /* Number of times we wait to exit on a side exit before we try to extend the tree. */ #define HOTEXIT 1 /* Number of times we try to extend the tree along a side exit. */ #define MAXEXIT 3 /* Maximum number of peer trees allowed. */ #define MAXPEERS 9 /* Max call depths for inlining. */ #define MAX_CALLDEPTH 10 /* Max native stack size. */ #define MAX_NATIVE_STACK_SLOTS 1024 /* Max call stack size. */ #define MAX_CALL_STACK_ENTRIES 64 /* Max global object size. */ #define MAX_GLOBAL_SLOTS 4096 /* Max memory needed to rebuild the interpreter stack when falling off trace. */ #define MAX_INTERP_STACK_BYTES \ (MAX_NATIVE_STACK_SLOTS * sizeof(jsval) + \ MAX_CALL_STACK_ENTRIES * sizeof(JSInlineFrame) + \ sizeof(JSInlineFrame)) /* possibly slow native frame at top of stack */ /* Max number of branches per tree. */ #define MAX_BRANCHES 32 #define CHECK_STATUS(expr) \ JS_BEGIN_MACRO \ JSRecordingStatus _status = (expr); \ if (_status != JSRS_CONTINUE) \ return _status; \ JS_END_MACRO #ifdef JS_JIT_SPEW #define ABORT_TRACE_RV(msg, value) \ JS_BEGIN_MACRO \ debug_only_printf(LC_TMAbort, "abort: %d: %s\n", __LINE__, (msg)); \ return (value); \ JS_END_MACRO #else #define ABORT_TRACE_RV(msg, value) return (value) #endif #define ABORT_TRACE(msg) ABORT_TRACE_RV(msg, JSRS_STOP) #define ABORT_TRACE_ERROR(msg) ABORT_TRACE_RV(msg, JSRS_ERROR) #ifdef JS_JIT_SPEW struct __jitstats { #define JITSTAT(x) uint64 x; #include "jitstats.tbl" #undef JITSTAT } jitstats = { 0LL, }; JS_STATIC_ASSERT(sizeof(jitstats) % sizeof(uint64) == 0); enum jitstat_ids { #define JITSTAT(x) STAT ## x ## ID, #include "jitstats.tbl" #undef JITSTAT STAT_IDS_TOTAL }; static JSPropertySpec jitstats_props[] = { #define JITSTAT(x) { #x, STAT ## x ## ID, JSPROP_ENUMERATE | JSPROP_READONLY | JSPROP_PERMANENT }, #include "jitstats.tbl" #undef JITSTAT { 0 } }; static JSBool jitstats_getProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp) { int index = -1; if (JSVAL_IS_STRING(id)) { JSString* str = JSVAL_TO_STRING(id); if (strcmp(JS_GetStringBytes(str), "HOTLOOP") == 0) { *vp = INT_TO_JSVAL(HOTLOOP); return JS_TRUE; } } if (JSVAL_IS_INT(id)) index = JSVAL_TO_INT(id); uint64 result = 0; switch (index) { #define JITSTAT(x) case STAT ## x ## ID: result = jitstats.x; break; #include "jitstats.tbl" #undef JITSTAT default: *vp = JSVAL_VOID; return JS_TRUE; } if (result < JSVAL_INT_MAX) { *vp = INT_TO_JSVAL(result); return JS_TRUE; } char retstr[64]; JS_snprintf(retstr, sizeof retstr, "%llu", result); *vp = STRING_TO_JSVAL(JS_NewStringCopyZ(cx, retstr)); return JS_TRUE; } JSClass jitstats_class = { "jitstats", JSCLASS_HAS_PRIVATE, JS_PropertyStub, JS_PropertyStub, jitstats_getProperty, JS_PropertyStub, JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, JS_FinalizeStub, JSCLASS_NO_OPTIONAL_MEMBERS }; void js_InitJITStatsClass(JSContext *cx, JSObject *glob) { JS_InitClass(cx, glob, NULL, &jitstats_class, NULL, 0, jitstats_props, NULL, NULL, NULL); } #define AUDIT(x) (jitstats.x++) #else #define AUDIT(x) ((void)0) #endif /* JS_JIT_SPEW */ #define INS_CONST(c) addName(lir->insImm(c), #c) #define INS_CONSTPTR(p) addName(lir->insImmPtr(p), #p) #define INS_CONSTFUNPTR(p) addName(lir->insImmPtr(JS_FUNC_TO_DATA_PTR(void*, p)), #p) #define INS_CONSTWORD(v) addName(lir->insImmPtr((void *) v), #v) using namespace avmplus; using namespace nanojit; static GC gc = GC(); static avmplus::AvmCore s_core = avmplus::AvmCore(); static avmplus::AvmCore* core = &s_core; #ifdef JS_JIT_SPEW void js_DumpPeerStability(JSTraceMonitor* tm, const void* ip, JSObject* globalObj, uint32 globalShape, uint32 argc); #endif /* We really need a better way to configure the JIT. Shaver, where is my fancy JIT object? */ /* NB: this is raced on, if jstracer.cpp should ever be running MT. I think it's harmless tho. */ static bool did_we_check_processor_features = false; /* ------ Debug logging control ------ */ /* All the logging control stuff lives in here. It is shared between all threads, but I think that's OK. */ LogControl js_LogController; #ifdef JS_JIT_SPEW /* NB: this is raced on too, if jstracer.cpp should ever be running MT. Also harmless. */ static bool did_we_set_up_debug_logging = false; static void js_InitJITLogController ( void ) { char *tm, *tmf; uint32_t bits; js_LogController.lcbits = 0; tm = getenv("TRACEMONKEY"); if (tm) goto help; tmf = getenv("TMFLAGS"); if (!tmf) return; /* This is really a cheap hack as far as flag decoding goes. */ if (strstr(tmf, "help")) goto help; bits = 0; /* flags for jstracer.cpp */ if (strstr(tmf, "minimal")) bits |= LC_TMMinimal; if (strstr(tmf, "tracer")) bits |= LC_TMTracer; if (strstr(tmf, "recorder")) bits |= LC_TMRecorder; if (strstr(tmf, "patcher")) bits |= LC_TMPatcher; if (strstr(tmf, "abort")) bits |= LC_TMAbort; if (strstr(tmf, "stats")) bits |= LC_TMStats; if (strstr(tmf, "regexp")) bits |= LC_TMRegexp; /* flags for nanojit */ if (strstr(tmf, "liveness")) bits |= LC_Liveness; if (strstr(tmf, "readlir")) bits |= LC_ReadLIR; if (strstr(tmf, "aftersf_sp")) bits |= LC_AfterSF_SP; if (strstr(tmf, "aftersf_rp")) bits |= LC_AfterSF_RP; if (strstr(tmf, "afterdeadf")) bits |= LC_AfterDeadF; if (strstr(tmf, "regalloc")) bits |= LC_RegAlloc; if (strstr(tmf, "assembly")) bits |= LC_Assembly; if (strstr(tmf, "nocodeaddrs")) bits |= LC_NoCodeAddrs; if (strstr(tmf, "full")) { bits |= LC_TMMinimal | LC_TMTracer | LC_TMRecorder | LC_TMPatcher | LC_TMAbort | LC_TMAbort | LC_TMStats | LC_TMRegexp | LC_Liveness | LC_ReadLIR | LC_AfterSF_SP | LC_AfterSF_RP | LC_AfterDeadF | LC_RegAlloc | LC_Assembly; } js_LogController.lcbits = bits; return; help: fflush(NULL); printf("\n"); printf("Debug output control help summary for TraceMonkey:\n"); printf("\n"); printf("TRACEMONKEY= is no longer used; use TMFLAGS= " "instead.\n"); printf("\n"); printf("usage: TMFLAGS=option,option,option,... where options can be:\n"); printf(" help show this message\n"); printf(" ------ options for jstracer & jsregexp ------\n"); printf(" minimal ultra-minimalist output; try this first\n"); printf(" full everything (old verbosity)\n"); printf(" tracer tracer lifetime (FIXME:better description)\n"); printf(" recorder trace recording stuff (FIXME:better description)\n"); printf(" patcher patching stuff (FIXME:better description)\n"); printf(" abort show trace recording aborts\n"); printf(" stats show trace recording stats\n"); printf(" regexp show compilation & entry for regexps\n"); printf(" ------ options for Nanojit ------\n"); printf(" liveness show LIR liveness at start of rdr pipeline\n"); printf(" readlir show LIR as it enters the reader pipeline\n"); printf(" aftersf_sp show LIR after StackFilter(sp)\n"); printf(" aftersf_rp show LIR after StackFilter(rp)\n"); printf(" afterdeadf show LIR after DeadCodeFilter\n"); printf(" regalloc show regalloc details\n"); printf(" assembly show final aggregated assembly code\n"); printf(" nocodeaddrs don't show code addresses in assembly listings\n"); printf("\n"); printf("Exiting now. Bye.\n"); printf("\n"); exit(0); /*NOTREACHED*/ } #endif #if defined DEBUG static const char* getExitName(ExitType type) { static const char* exitNames[] = { #define MAKE_EXIT_STRING(x) #x, JS_TM_EXITCODES(MAKE_EXIT_STRING) #undef MAKE_EXIT_STRING NULL }; JS_ASSERT(type < TOTAL_EXIT_TYPES); return exitNames[type]; } #endif /* The entire VM shares one oracle. Collisions and concurrent updates are tolerated and worst case cause performance regressions. */ static Oracle oracle; Tracker::Tracker() { pagelist = 0; } Tracker::~Tracker() { clear(); } jsuword Tracker::getPageBase(const void* v) const { return jsuword(v) & ~jsuword(NJ_PAGE_SIZE-1); } struct Tracker::Page* Tracker::findPage(const void* v) const { jsuword base = getPageBase(v); struct Tracker::Page* p = pagelist; while (p) { if (p->base == base) { return p; } p = p->next; } return 0; } struct Tracker::Page* Tracker::addPage(const void* v) { jsuword base = getPageBase(v); struct Tracker::Page* p = (struct Tracker::Page*) GC::Alloc(sizeof(*p) - sizeof(p->map) + (NJ_PAGE_SIZE >> 2) * sizeof(LIns*)); p->base = base; p->next = pagelist; pagelist = p; return p; } void Tracker::clear() { while (pagelist) { Page* p = pagelist; pagelist = pagelist->next; GC::Free(p); } } bool Tracker::has(const void *v) const { return get(v) != NULL; } #if defined NANOJIT_64BIT #define PAGEMASK 0x7ff #else #define PAGEMASK 0xfff #endif LIns* Tracker::get(const void* v) const { struct Tracker::Page* p = findPage(v); if (!p) return NULL; return p->map[(jsuword(v) & PAGEMASK) >> 2]; } void Tracker::set(const void* v, LIns* i) { struct Tracker::Page* p = findPage(v); if (!p) p = addPage(v); p->map[(jsuword(v) & PAGEMASK) >> 2] = i; } static inline jsuint argSlots(JSStackFrame* fp) { return JS_MAX(fp->argc, fp->fun->nargs); } static inline bool isNumber(jsval v) { return JSVAL_IS_INT(v) || JSVAL_IS_DOUBLE(v); } static inline jsdouble asNumber(jsval v) { JS_ASSERT(isNumber(v)); if (JSVAL_IS_DOUBLE(v)) return *JSVAL_TO_DOUBLE(v); return (jsdouble)JSVAL_TO_INT(v); } static inline bool isInt32(jsval v) { if (!isNumber(v)) return false; jsdouble d = asNumber(v); jsint i; return JSDOUBLE_IS_INT(d, i); } static inline jsint asInt32(jsval v) { JS_ASSERT(isNumber(v)); if (JSVAL_IS_INT(v)) return JSVAL_TO_INT(v); #ifdef DEBUG jsint i; JS_ASSERT(JSDOUBLE_IS_INT(*JSVAL_TO_DOUBLE(v), i)); #endif return jsint(*JSVAL_TO_DOUBLE(v)); } /* Return TT_DOUBLE for all numbers (int and double) and the tag otherwise. */ static inline JSTraceType getPromotedType(jsval v) { if (JSVAL_IS_INT(v)) return TT_DOUBLE; if (JSVAL_IS_OBJECT(v)) { if (JSVAL_IS_NULL(v)) return TT_NULL; if (HAS_FUNCTION_CLASS(JSVAL_TO_OBJECT(v))) return TT_FUNCTION; return TT_OBJECT; } uint8_t tag = JSVAL_TAG(v); JS_ASSERT(tag == JSVAL_DOUBLE || tag == JSVAL_STRING || tag == JSVAL_BOOLEAN); JS_STATIC_ASSERT(TT_DOUBLE == JSVAL_DOUBLE); JS_STATIC_ASSERT(TT_STRING == JSVAL_STRING); JS_STATIC_ASSERT(TT_PSEUDOBOOLEAN == JSVAL_BOOLEAN); return JSTraceType(tag); } /* Return TT_INT32 for all whole numbers that fit into signed 32-bit and the tag otherwise. */ static inline JSTraceType getCoercedType(jsval v) { if (isInt32(v)) return TT_INT32; if (JSVAL_IS_OBJECT(v)) { if (JSVAL_IS_NULL(v)) return TT_NULL; if (HAS_FUNCTION_CLASS(JSVAL_TO_OBJECT(v))) return TT_FUNCTION; return TT_OBJECT; } uint8_t tag = JSVAL_TAG(v); JS_ASSERT(tag == JSVAL_DOUBLE || tag == JSVAL_STRING || tag == JSVAL_BOOLEAN); JS_STATIC_ASSERT(TT_DOUBLE == JSVAL_DOUBLE); JS_STATIC_ASSERT(TT_STRING == JSVAL_STRING); JS_STATIC_ASSERT(TT_PSEUDOBOOLEAN == JSVAL_BOOLEAN); return JSTraceType(tag); } /* * Constant seed and accumulate step borrowed from the DJB hash. */ #define ORACLE_MASK (ORACLE_SIZE - 1) #define FRAGMENT_TABLE_MASK (FRAGMENT_TABLE_SIZE - 1) #define HASH_SEED 5381 static inline void hash_accum(uintptr_t& h, uintptr_t i, uintptr_t mask) { h = ((h << 5) + h + (mask & i)) & mask; } JS_REQUIRES_STACK static inline int stackSlotHash(JSContext* cx, unsigned slot) { uintptr_t h = HASH_SEED; hash_accum(h, uintptr_t(cx->fp->script), ORACLE_MASK); hash_accum(h, uintptr_t(cx->fp->regs->pc), ORACLE_MASK); hash_accum(h, uintptr_t(slot), ORACLE_MASK); return int(h); } JS_REQUIRES_STACK static inline int globalSlotHash(JSContext* cx, unsigned slot) { uintptr_t h = HASH_SEED; JSStackFrame* fp = cx->fp; while (fp->down) fp = fp->down; hash_accum(h, uintptr_t(fp->script), ORACLE_MASK); hash_accum(h, uintptr_t(OBJ_SHAPE(JS_GetGlobalForObject(cx, fp->scopeChain))), ORACLE_MASK); hash_accum(h, uintptr_t(slot), ORACLE_MASK); return int(h); } static inline int pcHash(jsbytecode* pc) { return int(uintptr_t(pc) & ORACLE_MASK); } Oracle::Oracle() { /* Grow the oracle bitsets to their (fixed) size here, once. */ _stackDontDemote.set(&gc, ORACLE_SIZE-1); _globalDontDemote.set(&gc, ORACLE_SIZE-1); clear(); } /* Tell the oracle that a certain global variable should not be demoted. */ JS_REQUIRES_STACK void Oracle::markGlobalSlotUndemotable(JSContext* cx, unsigned slot) { _globalDontDemote.set(&gc, globalSlotHash(cx, slot)); } /* Consult with the oracle whether we shouldn't demote a certain global variable. */ JS_REQUIRES_STACK bool Oracle::isGlobalSlotUndemotable(JSContext* cx, unsigned slot) const { return _globalDontDemote.get(globalSlotHash(cx, slot)); } /* Tell the oracle that a certain slot at a certain stack slot should not be demoted. */ JS_REQUIRES_STACK void Oracle::markStackSlotUndemotable(JSContext* cx, unsigned slot) { _stackDontDemote.set(&gc, stackSlotHash(cx, slot)); } /* Consult with the oracle whether we shouldn't demote a certain slot. */ JS_REQUIRES_STACK bool Oracle::isStackSlotUndemotable(JSContext* cx, unsigned slot) const { return _stackDontDemote.get(stackSlotHash(cx, slot)); } /* Tell the oracle that a certain slot at a certain bytecode location should not be demoted. */ void Oracle::markInstructionUndemotable(jsbytecode* pc) { _pcDontDemote.set(&gc, pcHash(pc)); } /* Consult with the oracle whether we shouldn't demote a certain bytecode location. */ bool Oracle::isInstructionUndemotable(jsbytecode* pc) const { return _pcDontDemote.get(pcHash(pc)); } void Oracle::clearDemotability() { _stackDontDemote.reset(); _globalDontDemote.reset(); _pcDontDemote.reset(); } struct PCHashEntry : public JSDHashEntryStub { size_t count; }; #define PC_HASH_COUNT 1024 static void js_Blacklist(jsbytecode* pc) { AUDIT(blacklisted); JS_ASSERT(*pc == JSOP_LOOP || *pc == JSOP_NOP); *pc = JSOP_NOP; } static void js_Backoff(JSContext *cx, jsbytecode* pc, Fragment* tree=NULL) { JSDHashTable *table = &JS_TRACE_MONITOR(cx).recordAttempts; if (table->ops) { PCHashEntry *entry = (PCHashEntry *) JS_DHashTableOperate(table, pc, JS_DHASH_ADD); if (entry) { if (!entry->key) { entry->key = pc; JS_ASSERT(entry->count == 0); } JS_ASSERT(JS_DHASH_ENTRY_IS_LIVE(&(entry->hdr))); if (entry->count++ > (BL_ATTEMPTS * MAXPEERS)) { entry->count = 0; js_Blacklist(pc); return; } } } if (tree) { tree->hits() -= BL_BACKOFF; /* * In case there is no entry or no table (due to OOM) or some * serious imbalance in the recording-attempt distribution on a * multitree, give each tree another chance to blacklist here as * well. */ if (++tree->recordAttempts > BL_ATTEMPTS) js_Blacklist(pc); } } static void js_resetRecordingAttempts(JSContext *cx, jsbytecode* pc) { JSDHashTable *table = &JS_TRACE_MONITOR(cx).recordAttempts; if (table->ops) { PCHashEntry *entry = (PCHashEntry *) JS_DHashTableOperate(table, pc, JS_DHASH_LOOKUP); if (JS_DHASH_ENTRY_IS_FREE(&(entry->hdr))) return; JS_ASSERT(JS_DHASH_ENTRY_IS_LIVE(&(entry->hdr))); entry->count = 0; } } static inline size_t fragmentHash(const void *ip, JSObject* globalObj, uint32 globalShape, uint32 argc) { uintptr_t h = HASH_SEED; hash_accum(h, uintptr_t(ip), FRAGMENT_TABLE_MASK); hash_accum(h, uintptr_t(globalObj), FRAGMENT_TABLE_MASK); hash_accum(h, uintptr_t(globalShape), FRAGMENT_TABLE_MASK); hash_accum(h, uintptr_t(argc), FRAGMENT_TABLE_MASK); return size_t(h); } /* * argc is cx->fp->argc at the trace loop header, i.e., the number of arguments * pushed for the innermost JS frame. This is required as part of the fragment * key because the fragment will write those arguments back to the interpreter * stack when it exits, using its typemap, which implicitly incorporates a given * value of argc. Without this feature, a fragment could be called as an inner * tree with two different values of argc, and entry type checking or exit * frame synthesis could crash. */ struct VMFragment : public Fragment { VMFragment(const void* _ip, JSObject* _globalObj, uint32 _globalShape, uint32 _argc) : Fragment(_ip), next(NULL), globalObj(_globalObj), globalShape(_globalShape), argc(_argc) {} VMFragment* next; JSObject* globalObj; uint32 globalShape; uint32 argc; }; static VMFragment* getVMFragment(JSTraceMonitor* tm, const void *ip, JSObject* globalObj, uint32 globalShape, uint32 argc) { size_t h = fragmentHash(ip, globalObj, globalShape, argc); VMFragment* vf = tm->vmfragments[h]; while (vf && ! (vf->globalObj == globalObj && vf->globalShape == globalShape && vf->ip == ip && vf->argc == argc)) { vf = vf->next; } return vf; } static VMFragment* getLoop(JSTraceMonitor* tm, const void *ip, JSObject* globalObj, uint32 globalShape, uint32 argc) { return getVMFragment(tm, ip, globalObj, globalShape, argc); } static Fragment* getAnchor(JSTraceMonitor* tm, const void *ip, JSObject* globalObj, uint32 globalShape, uint32 argc) { VMFragment *f = new (&gc) VMFragment(ip, globalObj, globalShape, argc); JS_ASSERT(f); Fragment *p = getVMFragment(tm, ip, globalObj, globalShape, argc); if (p) { f->first = p; /* append at the end of the peer list */ Fragment* next; while ((next = p->peer) != NULL) p = next; p->peer = f; } else { /* this is the first fragment */ f->first = f; size_t h = fragmentHash(ip, globalObj, globalShape, argc); f->next = tm->vmfragments[h]; tm->vmfragments[h] = f; } f->anchor = f; f->root = f; f->kind = LoopTrace; return f; } #ifdef DEBUG static void ensureTreeIsUnique(JSTraceMonitor* tm, VMFragment* f, TreeInfo* ti) { JS_ASSERT(f->root == f); /* * Check for duplicate entry type maps. This is always wrong and hints at * trace explosion since we are trying to stabilize something without * properly connecting peer edges. */ TreeInfo* ti_other; for (Fragment* peer = getLoop(tm, f->ip, f->globalObj, f->globalShape, f->argc); peer != NULL; peer = peer->peer) { if (!peer->code() || peer == f) continue; ti_other = (TreeInfo*)peer->vmprivate; JS_ASSERT(ti_other); JS_ASSERT(!ti->typeMap.matches(ti_other->typeMap)); } } #endif static void js_AttemptCompilation(JSContext *cx, JSTraceMonitor* tm, JSObject* globalObj, jsbytecode* pc, uint32 argc) { /* * If we already permanently blacklisted the location, undo that. */ JS_ASSERT(*(jsbytecode*)pc == JSOP_NOP || *(jsbytecode*)pc == JSOP_LOOP); *(jsbytecode*)pc = JSOP_LOOP; js_resetRecordingAttempts(cx, pc); /* * Breath new live into all peer fragments at the designated loop header. */ Fragment* f = (VMFragment*)getLoop(tm, pc, globalObj, OBJ_SHAPE(globalObj), argc); if (!f) { /* * If the global object's shape changed, we can't easily find the * corresponding loop header via a hash table lookup. In this * we simply bail here and hope that the fragment has another * outstanding compilation attempt. This case is extremely rare. */ return; } JS_ASSERT(f->root == f); f = f->first; while (f) { JS_ASSERT(f->root == f); --f->recordAttempts; f->hits() = HOTLOOP; f = f->peer; } } // Forward declarations. JS_DEFINE_CALLINFO_1(static, DOUBLE, i2f, INT32, 1, 1) JS_DEFINE_CALLINFO_1(static, DOUBLE, u2f, UINT32, 1, 1) static bool isi2f(LInsp i) { if (i->isop(LIR_i2f)) return true; if (nanojit::AvmCore::config.soft_float && i->isop(LIR_qjoin) && i->oprnd1()->isop(LIR_call) && i->oprnd2()->isop(LIR_callh)) { if (i->oprnd1()->callInfo() == &i2f_ci) return true; } return false; } static bool isu2f(LInsp i) { if (i->isop(LIR_u2f)) return true; if (nanojit::AvmCore::config.soft_float && i->isop(LIR_qjoin) && i->oprnd1()->isop(LIR_call) && i->oprnd2()->isop(LIR_callh)) { if (i->oprnd1()->callInfo() == &u2f_ci) return true; } return false; } static LInsp iu2fArg(LInsp i) { if (nanojit::AvmCore::config.soft_float && i->isop(LIR_qjoin)) { return i->oprnd1()->arg(0); } return i->oprnd1(); } static LIns* demote(LirWriter *out, LInsp i) { if (i->isCall()) return callArgN(i, 0); if (isi2f(i) || isu2f(i)) return iu2fArg(i); if (i->isconst()) return i; AvmAssert(i->isconstq()); double cf = i->imm64f(); int32_t ci = cf > 0x7fffffff ? uint32_t(cf) : int32_t(cf); return out->insImm(ci); } static bool isPromoteInt(LIns* i) { if (isi2f(i) || i->isconst()) return true; if (!i->isconstq()) return false; jsdouble d = i->imm64f(); return d == jsdouble(jsint(d)) && !JSDOUBLE_IS_NEGZERO(d); } static bool isPromoteUint(LIns* i) { if (isu2f(i) || i->isconst()) return true; if (!i->isconstq()) return false; jsdouble d = i->imm64f(); return d == jsdouble(jsuint(d)) && !JSDOUBLE_IS_NEGZERO(d); } static bool isPromote(LIns* i) { return isPromoteInt(i) || isPromoteUint(i); } static bool isconst(LIns* i, int32_t c) { return i->isconst() && i->imm32() == c; } /* * Determine whether this operand is guaranteed to not overflow the specified * integer operation. */ static bool overflowSafe(LOpcode op, LIns* i) { LIns* c; switch (op) { case LIR_add: case LIR_sub: return (i->isop(LIR_and) && ((c = i->oprnd2())->isconst()) && ((c->imm32() & 0xc0000000) == 0)) || (i->isop(LIR_rsh) && ((c = i->oprnd2())->isconst()) && ((c->imm32() > 0))); default: JS_ASSERT(op == LIR_mul); } return (i->isop(LIR_and) && ((c = i->oprnd2())->isconst()) && ((c->imm32() & 0xffff0000) == 0)) || (i->isop(LIR_ush) && ((c = i->oprnd2())->isconst()) && ((c->imm32() >= 16))); } /* soft float support */ static jsdouble FASTCALL fneg(jsdouble x) { return -x; } JS_DEFINE_CALLINFO_1(static, DOUBLE, fneg, DOUBLE, 1, 1) static jsdouble FASTCALL i2f(int32 i) { return i; } static jsdouble FASTCALL u2f(jsuint u) { return u; } static int32 FASTCALL fcmpeq(jsdouble x, jsdouble y) { return x==y; } JS_DEFINE_CALLINFO_2(static, INT32, fcmpeq, DOUBLE, DOUBLE, 1, 1) static int32 FASTCALL fcmplt(jsdouble x, jsdouble y) { return x < y; } JS_DEFINE_CALLINFO_2(static, INT32, fcmplt, DOUBLE, DOUBLE, 1, 1) static int32 FASTCALL fcmple(jsdouble x, jsdouble y) { return x <= y; } JS_DEFINE_CALLINFO_2(static, INT32, fcmple, DOUBLE, DOUBLE, 1, 1) static int32 FASTCALL fcmpgt(jsdouble x, jsdouble y) { return x > y; } JS_DEFINE_CALLINFO_2(static, INT32, fcmpgt, DOUBLE, DOUBLE, 1, 1) static int32 FASTCALL fcmpge(jsdouble x, jsdouble y) { return x >= y; } JS_DEFINE_CALLINFO_2(static, INT32, fcmpge, DOUBLE, DOUBLE, 1, 1) static jsdouble FASTCALL fmul(jsdouble x, jsdouble y) { return x * y; } JS_DEFINE_CALLINFO_2(static, DOUBLE, fmul, DOUBLE, DOUBLE, 1, 1) static jsdouble FASTCALL fadd(jsdouble x, jsdouble y) { return x + y; } JS_DEFINE_CALLINFO_2(static, DOUBLE, fadd, DOUBLE, DOUBLE, 1, 1) static jsdouble FASTCALL fdiv(jsdouble x, jsdouble y) { return x / y; } JS_DEFINE_CALLINFO_2(static, DOUBLE, fdiv, DOUBLE, DOUBLE, 1, 1) static jsdouble FASTCALL fsub(jsdouble x, jsdouble y) { return x - y; } JS_DEFINE_CALLINFO_2(static, DOUBLE, fsub, DOUBLE, DOUBLE, 1, 1) class SoftFloatFilter: public LirWriter { public: SoftFloatFilter(LirWriter* out): LirWriter(out) { } LInsp quadCall(const CallInfo *ci, LInsp args[]) { LInsp qlo, qhi; qlo = out->insCall(ci, args); qhi = out->ins1(LIR_callh, qlo); return out->qjoin(qlo, qhi); } LInsp ins1(LOpcode v, LInsp s0) { if (v == LIR_fneg) return quadCall(&fneg_ci, &s0); if (v == LIR_i2f) return quadCall(&i2f_ci, &s0); if (v == LIR_u2f) return quadCall(&u2f_ci, &s0); return out->ins1(v, s0); } LInsp ins2(LOpcode v, LInsp s0, LInsp s1) { LInsp args[2]; LInsp bv; // change the numeric value and order of these LIR opcodes and die if (LIR_fadd <= v && v <= LIR_fdiv) { static const CallInfo *fmap[] = { &fadd_ci, &fsub_ci, &fmul_ci, &fdiv_ci }; args[0] = s1; args[1] = s0; return quadCall(fmap[v - LIR_fadd], args); } if (LIR_feq <= v && v <= LIR_fge) { static const CallInfo *fmap[] = { &fcmpeq_ci, &fcmplt_ci, &fcmpgt_ci, &fcmple_ci, &fcmpge_ci }; args[0] = s1; args[1] = s0; bv = out->insCall(fmap[v - LIR_feq], args); return out->ins2(LIR_eq, bv, out->insImm(1)); } return out->ins2(v, s0, s1); } LInsp insCall(const CallInfo *ci, LInsp args[]) { // if the return type is ARGSIZE_F, we have // to do a quadCall ( qjoin(call,callh) ) if ((ci->_argtypes & 3) == ARGSIZE_F) return quadCall(ci, args); return out->insCall(ci, args); } }; class FuncFilter: public LirWriter { public: FuncFilter(LirWriter* out): LirWriter(out) { } LInsp ins2(LOpcode v, LInsp s0, LInsp s1) { if (s0 == s1 && v == LIR_feq) { if (isPromote(s0)) { // double(int) and double(uint) cannot be nan return insImm(1); } if (s0->isop(LIR_fmul) || s0->isop(LIR_fsub) || s0->isop(LIR_fadd)) { LInsp lhs = s0->oprnd1(); LInsp rhs = s0->oprnd2(); if (isPromote(lhs) && isPromote(rhs)) { // add/sub/mul promoted ints can't be nan return insImm(1); } } } else if (LIR_feq <= v && v <= LIR_fge) { if (isPromoteInt(s0) && isPromoteInt(s1)) { // demote fcmp to cmp v = LOpcode(v + (LIR_eq - LIR_feq)); return out->ins2(v, demote(out, s0), demote(out, s1)); } else if (isPromoteUint(s0) && isPromoteUint(s1)) { // uint compare v = LOpcode(v + (LIR_eq - LIR_feq)); if (v != LIR_eq) v = LOpcode(v + (LIR_ult - LIR_lt)); // cmp -> ucmp return out->ins2(v, demote(out, s0), demote(out, s1)); } } else if (v == LIR_or && s0->isop(LIR_lsh) && isconst(s0->oprnd2(), 16) && s1->isop(LIR_and) && isconst(s1->oprnd2(), 0xffff)) { LIns* msw = s0->oprnd1(); LIns* lsw = s1->oprnd1(); LIns* x; LIns* y; if (lsw->isop(LIR_add) && lsw->oprnd1()->isop(LIR_and) && lsw->oprnd2()->isop(LIR_and) && isconst(lsw->oprnd1()->oprnd2(), 0xffff) && isconst(lsw->oprnd2()->oprnd2(), 0xffff) && msw->isop(LIR_add) && msw->oprnd1()->isop(LIR_add) && msw->oprnd2()->isop(LIR_rsh) && msw->oprnd1()->oprnd1()->isop(LIR_rsh) && msw->oprnd1()->oprnd2()->isop(LIR_rsh) && isconst(msw->oprnd2()->oprnd2(), 16) && isconst(msw->oprnd1()->oprnd1()->oprnd2(), 16) && isconst(msw->oprnd1()->oprnd2()->oprnd2(), 16) && (x = lsw->oprnd1()->oprnd1()) == msw->oprnd1()->oprnd1()->oprnd1() && (y = lsw->oprnd2()->oprnd1()) == msw->oprnd1()->oprnd2()->oprnd1() && lsw == msw->oprnd2()->oprnd1()) { return out->ins2(LIR_add, x, y); } } return out->ins2(v, s0, s1); } LInsp insCall(const CallInfo *ci, LInsp args[]) { if (ci == &js_DoubleToUint32_ci) { LInsp s0 = args[0]; if (s0->isconstq()) return out->insImm(js_DoubleToECMAUint32(s0->imm64f())); if (isi2f(s0) || isu2f(s0)) return iu2fArg(s0); } else if (ci == &js_DoubleToInt32_ci) { LInsp s0 = args[0]; if (s0->isconstq()) return out->insImm(js_DoubleToECMAInt32(s0->imm64f())); if (s0->isop(LIR_fadd) || s0->isop(LIR_fsub)) { LInsp lhs = s0->oprnd1(); LInsp rhs = s0->oprnd2(); if (isPromote(lhs) && isPromote(rhs)) { LOpcode op = LOpcode(s0->opcode() & ~LIR64); return out->ins2(op, demote(out, lhs), demote(out, rhs)); } } if (isi2f(s0) || isu2f(s0)) return iu2fArg(s0); // XXX ARM -- check for qjoin(call(UnboxDouble),call(UnboxDouble)) if (s0->isCall()) { const CallInfo* ci2 = s0->callInfo(); if (ci2 == &js_UnboxDouble_ci) { LIns* args2[] = { callArgN(s0, 0) }; return out->insCall(&js_UnboxInt32_ci, args2); } else if (ci2 == &js_StringToNumber_ci) { // callArgN's ordering is that as seen by the builtin, not as stored in // args here. True story! LIns* args2[] = { callArgN(s0, 1), callArgN(s0, 0) }; return out->insCall(&js_StringToInt32_ci, args2); } else if (ci2 == &js_String_p_charCodeAt0_ci) { // Use a fast path builtin for a charCodeAt that converts to an int right away. LIns* args2[] = { callArgN(s0, 0) }; return out->insCall(&js_String_p_charCodeAt0_int_ci, args2); } else if (ci2 == &js_String_p_charCodeAt_ci) { LIns* idx = callArgN(s0, 1); // If the index is not already an integer, force it to be an integer. idx = isPromote(idx) ? demote(out, idx) : out->insCall(&js_DoubleToInt32_ci, &idx); LIns* args2[] = { idx, callArgN(s0, 0) }; return out->insCall(&js_String_p_charCodeAt_int_ci, args2); } } } else if (ci == &js_BoxDouble_ci) { LInsp s0 = args[0]; JS_ASSERT(s0->isQuad()); if (isi2f(s0)) { LIns* args2[] = { iu2fArg(s0), args[1] }; return out->insCall(&js_BoxInt32_ci, args2); } if (s0->isCall() && s0->callInfo() == &js_UnboxDouble_ci) return callArgN(s0, 0); } return out->insCall(ci, args); } }; template JS_REQUIRES_STACK static bool VisitFrameSlots(Visitor &visitor, unsigned depth, JSStackFrame *fp, JSStackFrame *up) { if (depth > 0 && !VisitFrameSlots(visitor, depth-1, fp->down, fp)) return false; if (fp->callee) { if (depth == 0) { visitor.setStackSlotKind("args"); if (!visitor.visitStackSlots(&fp->argv[-2], argSlots(fp) + 2, fp)) return false; } visitor.setStackSlotKind("var"); if (!visitor.visitStackSlots(fp->slots, fp->script->nfixed, fp)) return false; } visitor.setStackSlotKind("stack"); JS_ASSERT(fp->regs->sp >= StackBase(fp)); if (!visitor.visitStackSlots(StackBase(fp), size_t(fp->regs->sp - StackBase(fp)), fp)) { return false; } if (up) { int missing = up->fun->nargs - up->argc; if (missing > 0) { visitor.setStackSlotKind("missing"); if (!visitor.visitStackSlots(fp->regs->sp, size_t(missing), fp)) return false; } } return true; } template JS_REQUIRES_STACK static JS_ALWAYS_INLINE bool VisitStackSlots(Visitor &visitor, JSContext *cx, unsigned callDepth) { return VisitFrameSlots(visitor, callDepth, cx->fp, NULL); } template JS_REQUIRES_STACK static JS_ALWAYS_INLINE void VisitGlobalSlots(Visitor &visitor, JSContext *cx, JSObject *globalObj, unsigned ngslots, uint16 *gslots) { for (unsigned n = 0; n < ngslots; ++n) { unsigned slot = gslots[n]; visitor.visitGlobalSlot(&STOBJ_GET_SLOT(globalObj, slot), n, slot); } } class AdjustCallerTypeVisitor; template JS_REQUIRES_STACK static JS_ALWAYS_INLINE void VisitGlobalSlots(Visitor &visitor, JSContext *cx, SlotList &gslots) { VisitGlobalSlots(visitor, cx, JS_GetGlobalForObject(cx, cx->fp->scopeChain), gslots.length(), gslots.data()); } template JS_REQUIRES_STACK static JS_ALWAYS_INLINE void VisitSlots(Visitor& visitor, JSContext* cx, JSObject* globalObj, unsigned callDepth, unsigned ngslots, uint16* gslots) { if (VisitStackSlots(visitor, cx, callDepth)) VisitGlobalSlots(visitor, cx, globalObj, ngslots, gslots); } template JS_REQUIRES_STACK static JS_ALWAYS_INLINE void VisitSlots(Visitor& visitor, JSContext* cx, unsigned callDepth, unsigned ngslots, uint16* gslots) { VisitSlots(visitor, cx, JS_GetGlobalForObject(cx, cx->fp->scopeChain), callDepth, ngslots, gslots); } template JS_REQUIRES_STACK static JS_ALWAYS_INLINE void VisitSlots(Visitor &visitor, JSContext *cx, JSObject *globalObj, unsigned callDepth, const SlotList& slots) { VisitSlots(visitor, cx, globalObj, callDepth, slots.length(), slots.data()); } template JS_REQUIRES_STACK static JS_ALWAYS_INLINE void VisitSlots(Visitor &visitor, JSContext *cx, unsigned callDepth, const SlotList& slots) { VisitSlots(visitor, cx, JS_GetGlobalForObject(cx, cx->fp->scopeChain), callDepth, slots.length(), slots.data()); } class SlotVisitorBase { #ifdef JS_JIT_SPEW protected: char const *mStackSlotKind; public: SlotVisitorBase() : mStackSlotKind(NULL) {} JS_ALWAYS_INLINE const char *stackSlotKind() { return mStackSlotKind; } JS_ALWAYS_INLINE void setStackSlotKind(char const *k) { mStackSlotKind = k; } #else public: JS_ALWAYS_INLINE const char *stackSlotKind() { return NULL; } JS_ALWAYS_INLINE void setStackSlotKind(char const *k) {} #endif }; struct CountSlotsVisitor : public SlotVisitorBase { unsigned mCount; bool mDone; jsval* mStop; public: JS_ALWAYS_INLINE CountSlotsVisitor(jsval* stop = NULL) : mCount(0), mDone(false), mStop(stop) {} JS_REQUIRES_STACK JS_ALWAYS_INLINE bool visitStackSlots(jsval *vp, size_t count, JSStackFrame* fp) { if (mDone) return false; if (mStop && size_t(mStop - vp) < count) { mCount += size_t(mStop - vp); mDone = true; return false; } mCount += count; return true; } JS_ALWAYS_INLINE unsigned count() { return mCount; } JS_ALWAYS_INLINE bool stopped() { return mDone; } }; /* Calculate the total number of native frame slots we need from this frame all the way back to the entry frame, including the current stack usage. */ JS_REQUIRES_STACK unsigned js_NativeStackSlots(JSContext *cx, unsigned callDepth) { JSStackFrame* fp = cx->fp; unsigned slots = 0; unsigned depth = callDepth; for (;;) { unsigned operands = fp->regs->sp - StackBase(fp); slots += operands; if (fp->callee) slots += fp->script->nfixed; if (depth-- == 0) { if (fp->callee) slots += 2/*callee,this*/ + argSlots(fp); #ifdef DEBUG CountSlotsVisitor visitor; VisitStackSlots(visitor, cx, callDepth); JS_ASSERT(visitor.count() == slots && !visitor.stopped()); #endif return slots; } JSStackFrame* fp2 = fp; fp = fp->down; int missing = fp2->fun->nargs - fp2->argc; if (missing > 0) slots += missing; } JS_NOT_REACHED("js_NativeStackSlots"); } class CaptureTypesVisitor : public SlotVisitorBase { JSContext* mCx; JSTraceType* mTypeMap; JSTraceType* mPtr; public: JS_ALWAYS_INLINE CaptureTypesVisitor(JSContext* cx, JSTraceType* typeMap) : mCx(cx), mTypeMap(typeMap), mPtr(typeMap) {} JS_REQUIRES_STACK JS_ALWAYS_INLINE void visitGlobalSlot(jsval *vp, unsigned n, unsigned slot) { JSTraceType type = getCoercedType(*vp); if (type == TT_INT32 && oracle.isGlobalSlotUndemotable(mCx, slot)) type = TT_DOUBLE; JS_ASSERT(type != TT_JSVAL); debug_only_printf(LC_TMTracer, "capture type global%d: %d=%c\n", n, type, typeChar[type]); *mPtr++ = type; } JS_REQUIRES_STACK JS_ALWAYS_INLINE bool visitStackSlots(jsval *vp, int count, JSStackFrame* fp) { for (int i = 0; i < count; ++i) { JSTraceType type = getCoercedType(vp[i]); if (type == TT_INT32 && oracle.isStackSlotUndemotable(mCx, length())) type = TT_DOUBLE; JS_ASSERT(type != TT_JSVAL); debug_only_printf(LC_TMTracer, "capture type %s%d: %d=%c\n", stackSlotKind(), i, type, typeChar[type]); *mPtr++ = type; } return true; } JS_ALWAYS_INLINE uintptr_t length() { return mPtr - mTypeMap; } }; /* * Capture the type map for the selected slots of the global object and currently pending * stack frames. */ JS_REQUIRES_STACK void TypeMap::captureTypes(JSContext* cx, JSObject* globalObj, SlotList& slots, unsigned callDepth) { setLength(js_NativeStackSlots(cx, callDepth) + slots.length()); CaptureTypesVisitor visitor(cx, data()); VisitSlots(visitor, cx, globalObj, callDepth, slots); JS_ASSERT(visitor.length() == length()); } JS_REQUIRES_STACK void TypeMap::captureMissingGlobalTypes(JSContext* cx, JSObject* globalObj, SlotList& slots, unsigned stackSlots) { unsigned oldSlots = length() - stackSlots; int diff = slots.length() - oldSlots; JS_ASSERT(diff >= 0); setLength(length() + diff); CaptureTypesVisitor visitor(cx, data() + stackSlots + oldSlots); VisitGlobalSlots(visitor, cx, globalObj, diff, slots.data() + oldSlots); } /* Compare this type map to another one and see whether they match. */ bool TypeMap::matches(TypeMap& other) const { if (length() != other.length()) return false; return !memcmp(data(), other.data(), length()); } /* Use the provided storage area to create a new type map that contains the partial type map with the rest of it filled up from the complete type map. */ static void mergeTypeMaps(JSTraceType** partial, unsigned* plength, JSTraceType* complete, unsigned clength, JSTraceType* mem) { unsigned l = *plength; JS_ASSERT(l < clength); memcpy(mem, *partial, l * sizeof(JSTraceType)); memcpy(mem + l, complete + l, (clength - l) * sizeof(JSTraceType)); *partial = mem; *plength = clength; } /* Specializes a tree to any missing globals, including any dependent trees. */ static JS_REQUIRES_STACK void specializeTreesToMissingGlobals(JSContext* cx, JSObject* globalObj, TreeInfo* root) { TreeInfo* ti = root; ti->typeMap.captureMissingGlobalTypes(cx, globalObj, *ti->globalSlots, ti->nStackTypes); JS_ASSERT(ti->globalSlots->length() == ti->typeMap.length() - ti->nStackTypes); for (unsigned i = 0; i < root->dependentTrees.length(); i++) { ti = (TreeInfo*)root->dependentTrees[i]->vmprivate; /* ti can be NULL if we hit the recording tree in emitTreeCall; this is harmless. */ if (ti && ti->nGlobalTypes() < ti->globalSlots->length()) specializeTreesToMissingGlobals(cx, globalObj, ti); } for (unsigned i = 0; i < root->linkedTrees.length(); i++) { ti = (TreeInfo*)root->linkedTrees[i]->vmprivate; if (ti && ti->nGlobalTypes() < ti->globalSlots->length()) specializeTreesToMissingGlobals(cx, globalObj, ti); } } static void js_TrashTree(JSContext* cx, Fragment* f); JS_REQUIRES_STACK TraceRecorder::TraceRecorder(JSContext* cx, VMSideExit* _anchor, Fragment* _fragment, TreeInfo* ti, unsigned stackSlots, unsigned ngslots, JSTraceType* typeMap, VMSideExit* innermostNestedGuard, jsbytecode* outer, uint32 outerArgc) { JS_ASSERT(!_fragment->vmprivate && ti && cx->fp->regs->pc == (jsbytecode*)_fragment->ip); /* Reset the fragment state we care about in case we got a recycled fragment. */ _fragment->lastIns = NULL; this->cx = cx; this->traceMonitor = &JS_TRACE_MONITOR(cx); this->globalObj = JS_GetGlobalForObject(cx, cx->fp->scopeChain); this->lexicalBlock = cx->fp->blockChain; this->anchor = _anchor; this->fragment = _fragment; this->lirbuf = _fragment->lirbuf; this->treeInfo = ti; this->callDepth = _anchor ? _anchor->calldepth : 0; this->atoms = FrameAtomBase(cx, cx->fp); this->deepAborted = false; this->trashSelf = false; this->global_dslots = this->globalObj->dslots; this->loop = true; /* default assumption is we are compiling a loop */ this->wasRootFragment = _fragment == _fragment->root; this->outer = outer; this->outerArgc = outerArgc; this->pendingTraceableNative = NULL; this->newobj_ins = NULL; this->generatedTraceableNative = new JSTraceableNative(); JS_ASSERT(generatedTraceableNative); #ifdef JS_JIT_SPEW debug_only_print0(LC_TMMinimal, "\n"); debug_only_printf(LC_TMMinimal, "Recording starting from %s:%u@%u\n", ti->treeFileName, ti->treeLineNumber, ti->treePCOffset); debug_only_printf(LC_TMTracer, "globalObj=%p, shape=%d\n", (void*)this->globalObj, OBJ_SHAPE(this->globalObj)); #endif lir = lir_buf_writer = new (&gc) LirBufWriter(lirbuf); debug_only_stmt( if (js_LogController.lcbits & LC_TMRecorder) { lir = verbose_filter = new (&gc) VerboseWriter(&gc, lir, lirbuf->names, &js_LogController); } ) if (nanojit::AvmCore::config.soft_float) lir = float_filter = new (&gc) SoftFloatFilter(lir); else float_filter = 0; lir = cse_filter = new (&gc) CseFilter(lir, &gc); lir = expr_filter = new (&gc) ExprFilter(lir); lir = func_filter = new (&gc) FuncFilter(lir); lir->ins0(LIR_start); if (!nanojit::AvmCore::config.tree_opt || fragment->root == fragment) lirbuf->state = addName(lir->insParam(0, 0), "state"); lirbuf->sp = addName(lir->insLoad(LIR_ldp, lirbuf->state, (int)offsetof(InterpState, sp)), "sp"); lirbuf->rp = addName(lir->insLoad(LIR_ldp, lirbuf->state, offsetof(InterpState, rp)), "rp"); cx_ins = addName(lir->insLoad(LIR_ldp, lirbuf->state, offsetof(InterpState, cx)), "cx"); eos_ins = addName(lir->insLoad(LIR_ldp, lirbuf->state, offsetof(InterpState, eos)), "eos"); eor_ins = addName(lir->insLoad(LIR_ldp, lirbuf->state, offsetof(InterpState, eor)), "eor"); /* If we came from exit, we might not have enough global types. */ if (ti->globalSlots->length() > ti->nGlobalTypes()) specializeTreesToMissingGlobals(cx, globalObj, ti); /* read into registers all values on the stack and all globals we know so far */ import(treeInfo, lirbuf->sp, stackSlots, ngslots, callDepth, typeMap); if (fragment == fragment->root) { /* * We poll the operation callback request flag. It is updated asynchronously whenever * the callback is to be invoked. */ LIns* x = lir->insLoadi(cx_ins, offsetof(JSContext, operationCallbackFlag)); guard(true, lir->ins_eq0(x), snapshot(TIMEOUT_EXIT)); } /* If we are attached to a tree call guard, make sure the guard the inner tree exited from is what we expect it to be. */ if (_anchor && _anchor->exitType == NESTED_EXIT) { LIns* nested_ins = addName(lir->insLoad(LIR_ldp, lirbuf->state, offsetof(InterpState, lastTreeExitGuard)), "lastTreeExitGuard"); guard(true, lir->ins2(LIR_eq, nested_ins, INS_CONSTPTR(innermostNestedGuard)), NESTED_EXIT); } } TreeInfo::~TreeInfo() { UnstableExit* temp; while (unstableExits) { temp = unstableExits->next; delete unstableExits; unstableExits = temp; } } TraceRecorder::~TraceRecorder() { JS_ASSERT(nextRecorderToAbort == NULL); JS_ASSERT(treeInfo && (fragment || wasDeepAborted())); #ifdef DEBUG TraceRecorder* tr = JS_TRACE_MONITOR(cx).abortStack; while (tr != NULL) { JS_ASSERT(this != tr); tr = tr->nextRecorderToAbort; } #endif if (fragment) { if (wasRootFragment && !fragment->root->code()) { JS_ASSERT(!fragment->root->vmprivate); delete treeInfo; } if (trashSelf) js_TrashTree(cx, fragment->root); for (unsigned int i = 0; i < whichTreesToTrash.length(); i++) js_TrashTree(cx, whichTreesToTrash[i]); } else if (wasRootFragment) { delete treeInfo; } #ifdef DEBUG debug_only_stmt( delete verbose_filter; ) #endif delete cse_filter; delete expr_filter; delete func_filter; delete float_filter; delete lir_buf_writer; delete generatedTraceableNative; } void TraceRecorder::removeFragmentoReferences() { fragment = NULL; } void TraceRecorder::deepAbort() { debug_only_print0(LC_TMTracer|LC_TMAbort, "deep abort"); deepAborted = true; } /* Add debug information to a LIR instruction as we emit it. */ inline LIns* TraceRecorder::addName(LIns* ins, const char* name) { #ifdef JS_JIT_SPEW /* We'll only ask for verbose Nanojit when .lcbits > 0, so there's no point in adding names otherwise. */ if (js_LogController.lcbits > 0) lirbuf->names->addName(ins, name); #endif return ins; } /* Determine the current call depth (starting with the entry frame.) */ unsigned TraceRecorder::getCallDepth() const { return callDepth; } /* Determine the offset in the native global frame for a jsval we track */ ptrdiff_t TraceRecorder::nativeGlobalOffset(jsval* p) const { JS_ASSERT(isGlobal(p)); if (size_t(p - globalObj->fslots) < JS_INITIAL_NSLOTS) return sizeof(InterpState) + size_t(p - globalObj->fslots) * sizeof(double); return sizeof(InterpState) + ((p - globalObj->dslots) + JS_INITIAL_NSLOTS) * sizeof(double); } /* Determine whether a value is a global stack slot */ bool TraceRecorder::isGlobal(jsval* p) const { return ((size_t(p - globalObj->fslots) < JS_INITIAL_NSLOTS) || (size_t(p - globalObj->dslots) < (STOBJ_NSLOTS(globalObj) - JS_INITIAL_NSLOTS))); } /* Determine the offset in the native stack for a jsval we track */ JS_REQUIRES_STACK ptrdiff_t TraceRecorder::nativeStackOffset(jsval* p) const { CountSlotsVisitor visitor(p); VisitStackSlots(visitor, cx, callDepth); size_t offset = visitor.count() * sizeof(double); /* * If it's not in a pending frame, it must be on the stack of the current frame above * sp but below fp->slots + script->nslots. */ if (!visitor.stopped()) { JS_ASSERT(size_t(p - cx->fp->slots) < cx->fp->script->nslots); offset += size_t(p - cx->fp->regs->sp) * sizeof(double); } return offset; } /* Track the maximum number of native frame slots we need during execution. */ void TraceRecorder::trackNativeStackUse(unsigned slots) { if (slots > treeInfo->maxNativeStackSlots) treeInfo->maxNativeStackSlots = slots; } /* Unbox a jsval into a slot. Slots are wide enough to hold double values directly (instead of storing a pointer to them). We now assert instead of type checking, the caller must ensure the types are compatible. */ static void ValueToNative(JSContext* cx, jsval v, JSTraceType type, double* slot) { uint8_t tag = JSVAL_TAG(v); switch (type) { case TT_OBJECT: JS_ASSERT(tag == JSVAL_OBJECT); JS_ASSERT(!JSVAL_IS_NULL(v) && !HAS_FUNCTION_CLASS(JSVAL_TO_OBJECT(v))); *(JSObject**)slot = JSVAL_TO_OBJECT(v); debug_only_printf(LC_TMTracer, "object<%p:%s> ", (void*)JSVAL_TO_OBJECT(v), JSVAL_IS_NULL(v) ? "null" : STOBJ_GET_CLASS(JSVAL_TO_OBJECT(v))->name); return; case TT_INT32: jsint i; if (JSVAL_IS_INT(v)) *(jsint*)slot = JSVAL_TO_INT(v); else if (tag == JSVAL_DOUBLE && JSDOUBLE_IS_INT(*JSVAL_TO_DOUBLE(v), i)) *(jsint*)slot = i; else JS_ASSERT(JSVAL_IS_INT(v)); debug_only_printf(LC_TMTracer, "int<%d> ", *(jsint*)slot); return; case TT_DOUBLE: jsdouble d; if (JSVAL_IS_INT(v)) d = JSVAL_TO_INT(v); else d = *JSVAL_TO_DOUBLE(v); JS_ASSERT(JSVAL_IS_INT(v) || JSVAL_IS_DOUBLE(v)); *(jsdouble*)slot = d; debug_only_printf(LC_TMTracer, "double<%g> ", d); return; case TT_JSVAL: JS_NOT_REACHED("found jsval type in an entry type map"); return; case TT_STRING: JS_ASSERT(tag == JSVAL_STRING); *(JSString**)slot = JSVAL_TO_STRING(v); debug_only_printf(LC_TMTracer, "string<%p> ", (void*)(*(JSString**)slot)); return; case TT_NULL: JS_ASSERT(tag == JSVAL_OBJECT); *(JSObject**)slot = NULL; debug_only_print0(LC_TMTracer, "null "); return; case TT_PSEUDOBOOLEAN: /* Watch out for pseudo-booleans. */ JS_ASSERT(tag == JSVAL_BOOLEAN); *(JSBool*)slot = JSVAL_TO_PSEUDO_BOOLEAN(v); debug_only_printf(LC_TMTracer, "pseudoboolean<%d> ", *(JSBool*)slot); return; case TT_FUNCTION: { JS_ASSERT(tag == JSVAL_OBJECT); JSObject* obj = JSVAL_TO_OBJECT(v); *(JSObject**)slot = obj; #ifdef DEBUG JSFunction* fun = GET_FUNCTION_PRIVATE(cx, obj); debug_only_printf(LC_TMTracer, "function<%p:%s> ", (void*) obj, fun->atom ? JS_GetStringBytes(ATOM_TO_STRING(fun->atom)) : "unnamed"); #endif return; } } JS_NOT_REACHED("unexpected type"); } /* We maintain an emergency pool of doubles so we can recover safely if a trace runs out of memory (doubles or objects). */ static jsval AllocateDoubleFromReservedPool(JSContext* cx) { JSTraceMonitor* tm = &JS_TRACE_MONITOR(cx); JS_ASSERT(tm->reservedDoublePoolPtr > tm->reservedDoublePool); return *--tm->reservedDoublePoolPtr; } static bool js_ReplenishReservedPool(JSContext* cx, JSTraceMonitor* tm) { /* We should not be called with a full pool. */ JS_ASSERT((size_t) (tm->reservedDoublePoolPtr - tm->reservedDoublePool) < MAX_NATIVE_STACK_SLOTS); /* * When the GC runs in js_NewDoubleInRootedValue, it resets * tm->reservedDoublePoolPtr back to tm->reservedDoublePool. */ JSRuntime* rt = cx->runtime; uintN gcNumber = rt->gcNumber; uintN lastgcNumber = gcNumber; jsval* ptr = tm->reservedDoublePoolPtr; while (ptr < tm->reservedDoublePool + MAX_NATIVE_STACK_SLOTS) { if (!js_NewDoubleInRootedValue(cx, 0.0, ptr)) goto oom; /* Check if the last call to js_NewDoubleInRootedValue GC'd. */ if (rt->gcNumber != lastgcNumber) { lastgcNumber = rt->gcNumber; JS_ASSERT(tm->reservedDoublePoolPtr == tm->reservedDoublePool); ptr = tm->reservedDoublePool; /* * Have we GC'd more than once? We're probably running really * low on memory, bail now. */ if (uintN(rt->gcNumber - gcNumber) > uintN(1)) goto oom; continue; } ++ptr; } tm->reservedDoublePoolPtr = ptr; return true; oom: /* * Already massive GC pressure, no need to hold doubles back. * We won't run any native code anyway. */ tm->reservedDoublePoolPtr = tm->reservedDoublePool; return false; } /* Box a value from the native stack back into the jsval format. Integers that are too large to fit into a jsval are automatically boxed into heap-allocated doubles. */ static void NativeToValue(JSContext* cx, jsval& v, JSTraceType type, double* slot) { jsint i; jsdouble d; switch (type) { case TT_OBJECT: v = OBJECT_TO_JSVAL(*(JSObject**)slot); JS_ASSERT(v != JSVAL_ERROR_COOKIE); /* don't leak JSVAL_ERROR_COOKIE */ debug_only_printf(LC_TMTracer, "object<%p:%s> ", (void*)JSVAL_TO_OBJECT(v), JSVAL_IS_NULL(v) ? "null" : STOBJ_GET_CLASS(JSVAL_TO_OBJECT(v))->name); break; case TT_INT32: i = *(jsint*)slot; debug_only_printf(LC_TMTracer, "int<%d> ", i); store_int: if (INT_FITS_IN_JSVAL(i)) { v = INT_TO_JSVAL(i); break; } d = (jsdouble)i; goto store_double; case TT_DOUBLE: d = *slot; debug_only_printf(LC_TMTracer, "double<%g> ", d); if (JSDOUBLE_IS_INT(d, i)) goto store_int; store_double: { /* Its not safe to trigger the GC here, so use an emergency heap if we are out of double boxes. */ if (cx->doubleFreeList) { #ifdef DEBUG JSBool ok = #endif js_NewDoubleInRootedValue(cx, d, &v); JS_ASSERT(ok); return; } v = AllocateDoubleFromReservedPool(cx); JS_ASSERT(JSVAL_IS_DOUBLE(v) && *JSVAL_TO_DOUBLE(v) == 0.0); *JSVAL_TO_DOUBLE(v) = d; return; } case TT_JSVAL: v = *(jsval*)slot; JS_ASSERT(v != JSVAL_ERROR_COOKIE); /* don't leak JSVAL_ERROR_COOKIE */ debug_only_printf(LC_TMTracer, "box<%p> ", (void*)v); break; case TT_STRING: v = STRING_TO_JSVAL(*(JSString**)slot); debug_only_printf(LC_TMTracer, "string<%p> ", (void*)(*(JSString**)slot)); break; case TT_NULL: JS_ASSERT(*(JSObject**)slot == NULL); v = JSVAL_NULL; debug_only_printf(LC_TMTracer, "null<%p> ", (void*)(*(JSObject**)slot)); break; case TT_PSEUDOBOOLEAN: /* Watch out for pseudo-booleans. */ v = PSEUDO_BOOLEAN_TO_JSVAL(*(JSBool*)slot); debug_only_printf(LC_TMTracer, "boolean<%d> ", *(JSBool*)slot); break; case TT_FUNCTION: { JS_ASSERT(HAS_FUNCTION_CLASS(*(JSObject**)slot)); v = OBJECT_TO_JSVAL(*(JSObject**)slot); #ifdef DEBUG JSFunction* fun = GET_FUNCTION_PRIVATE(cx, JSVAL_TO_OBJECT(v)); debug_only_printf(LC_TMTracer, "function<%p:%s> ", (void*)JSVAL_TO_OBJECT(v), fun->atom ? JS_GetStringBytes(ATOM_TO_STRING(fun->atom)) : "unnamed"); #endif break; } } } class BuildNativeFrameVisitor : public SlotVisitorBase { JSContext *mCx; JSTraceType *mTypeMap; double *mGlobal; double *mStack; public: BuildNativeFrameVisitor(JSContext *cx, JSTraceType *typemap, double *global, double *stack) : mCx(cx), mTypeMap(typemap), mGlobal(global), mStack(stack) {} JS_REQUIRES_STACK JS_ALWAYS_INLINE void visitGlobalSlot(jsval *vp, unsigned n, unsigned slot) { debug_only_printf(LC_TMTracer, "global%d: ", n); ValueToNative(mCx, *vp, *mTypeMap++, &mGlobal[slot]); } JS_REQUIRES_STACK JS_ALWAYS_INLINE bool visitStackSlots(jsval *vp, int count, JSStackFrame* fp) { for (int i = 0; i < count; ++i) { debug_only_printf(LC_TMTracer, "%s%d: ", stackSlotKind(), i); ValueToNative(mCx, *vp++, *mTypeMap++, mStack++); } return true; } }; static JS_REQUIRES_STACK void BuildNativeFrame(JSContext *cx, JSObject *globalObj, unsigned callDepth, unsigned ngslots, uint16 *gslots, JSTraceType *typeMap, double *global, double *stack) { BuildNativeFrameVisitor visitor(cx, typeMap, global, stack); VisitSlots(visitor, cx, globalObj, callDepth, ngslots, gslots); debug_only_print0(LC_TMTracer, "\n"); } class FlushNativeGlobalFrameVisitor : public SlotVisitorBase { JSContext *mCx; JSTraceType *mTypeMap; double *mGlobal; public: FlushNativeGlobalFrameVisitor(JSContext *cx, JSTraceType *typeMap, double *global) : mCx(cx), mTypeMap(typeMap), mGlobal(global) {} JS_REQUIRES_STACK JS_ALWAYS_INLINE void visitGlobalSlot(jsval *vp, unsigned n, unsigned slot) { debug_only_printf(LC_TMTracer, "global%d=", n); NativeToValue(mCx, *vp, *mTypeMap++, &mGlobal[slot]); } }; class FlushNativeStackFrameVisitor : public SlotVisitorBase { JSContext *mCx; JSTraceType *mTypeMap; double *mStack; jsval *mStop; public: FlushNativeStackFrameVisitor(JSContext *cx, JSTraceType *typeMap, double *stack, jsval *stop) : mCx(cx), mTypeMap(typeMap), mStack(stack), mStop(stop) {} JSTraceType* getTypeMap() { return mTypeMap; } JS_REQUIRES_STACK JS_ALWAYS_INLINE bool visitStackSlots(jsval *vp, size_t count, JSStackFrame* fp) { for (size_t i = 0; i < count; ++i) { if (vp == mStop) return false; debug_only_printf(LC_TMTracer, "%s%u=", stackSlotKind(), unsigned(i)); NativeToValue(mCx, *vp++, *mTypeMap++, mStack++); } return true; } }; /* Box the given native frame into a JS frame. This is infallible. */ static JS_REQUIRES_STACK void FlushNativeGlobalFrame(JSContext *cx, double *global, unsigned ngslots, uint16 *gslots, JSTraceType *typemap) { FlushNativeGlobalFrameVisitor visitor(cx, typemap, global); JSObject *globalObj = JS_GetGlobalForObject(cx, cx->fp->scopeChain); VisitGlobalSlots(visitor, cx, globalObj, ngslots, gslots); debug_only_print0(LC_TMTracer, "\n"); } /* * Generic function to read upvars on trace. * T Traits type parameter. Must provide static functions: * interp_get(fp, slot) Read the value out of an interpreter frame. * native_slot(argc, slot) Return the position of the desired value in the on-trace * stack frame (with position 0 being callee). * * upvarLevel Static level of the function containing the upvar definition. * slot Identifies the value to get. The meaning is defined by the traits type. * callDepth Call depth of current point relative to trace entry */ template JSTraceType JS_INLINE js_GetUpvarOnTrace(JSContext* cx, uint32 upvarLevel, int32 slot, uint32 callDepth, double* result) { InterpState* state = cx->interpState; FrameInfo** fip = state->rp + callDepth; /* * First search the FrameInfo call stack for an entry containing * our upvar, namely one with level == upvarLevel. */ while (--fip >= state->callstackBase) { FrameInfo* fi = *fip; JSFunction* fun = GET_FUNCTION_PRIVATE(cx, fi->callee); uintN calleeLevel = fun->u.i.script->staticLevel; if (calleeLevel == upvarLevel) { /* * Now find the upvar's value in the native stack. * nativeStackFramePos is the offset of the start of the * activation record corresponding to *fip in the native * stack. */ int32 nativeStackFramePos = state->callstackBase[0]->spoffset; for (FrameInfo** fip2 = state->callstackBase; fip2 <= fip; fip2++) nativeStackFramePos += (*fip2)->spdist; nativeStackFramePos -= (2 + (*fip)->get_argc()); uint32 native_slot = T::native_slot((*fip)->get_argc(), slot); *result = state->stackBase[nativeStackFramePos + native_slot]; return fi->get_typemap()[native_slot]; } } // Next search the trace entry frame, which is not in the FrameInfo stack. if (state->outermostTree->script->staticLevel == upvarLevel) { uint32 argc = ((VMFragment*) state->outermostTree->fragment)->argc; uint32 native_slot = T::native_slot(argc, slot); *result = state->stackBase[native_slot]; return state->callstackBase[0]->get_typemap()[native_slot]; } /* * If we did not find the upvar in the frames for the active traces, * then we simply get the value from the interpreter state. */ JS_ASSERT(upvarLevel < JS_DISPLAY_SIZE); JSStackFrame* fp = cx->display[upvarLevel]; jsval v = T::interp_get(fp, slot); JSTraceType type = getCoercedType(v); ValueToNative(cx, v, type, result); return type; } // For this traits type, 'slot' is the argument index, which may be -2 for callee. struct UpvarArgTraits { static jsval interp_get(JSStackFrame* fp, int32 slot) { return fp->argv[slot]; } static uint32 native_slot(uint32 argc, int32 slot) { return 2 /*callee,this*/ + slot; } }; uint32 JS_FASTCALL js_GetUpvarArgOnTrace(JSContext* cx, uint32 upvarLevel, int32 slot, uint32 callDepth, double* result) { return js_GetUpvarOnTrace(cx, upvarLevel, slot, callDepth, result); } // For this traits type, 'slot' is an index into the local slots array. struct UpvarVarTraits { static jsval interp_get(JSStackFrame* fp, int32 slot) { return fp->slots[slot]; } static uint32 native_slot(uint32 argc, int32 slot) { return 2 /*callee,this*/ + argc + slot; } }; uint32 JS_FASTCALL js_GetUpvarVarOnTrace(JSContext* cx, uint32 upvarLevel, int32 slot, uint32 callDepth, double* result) { return js_GetUpvarOnTrace(cx, upvarLevel, slot, callDepth, result); } /* * For this traits type, 'slot' is an index into the stack area (within slots, after nfixed) * of a frame with no function. (On trace, the top-level frame is the only one that can have * no function.) */ struct UpvarStackTraits { static jsval interp_get(JSStackFrame* fp, int32 slot) { return fp->slots[slot + fp->script->nfixed]; } static uint32 native_slot(uint32 argc, int32 slot) { /* * Locals are not imported by the tracer when the frame has no function, so * we do not add fp->script->nfixed. */ JS_ASSERT(argc == 0); return slot; } }; uint32 JS_FASTCALL js_GetUpvarStackOnTrace(JSContext* cx, uint32 upvarLevel, int32 slot, uint32 callDepth, double* result) { return js_GetUpvarOnTrace(cx, upvarLevel, slot, callDepth, result); } /** * Box the given native stack frame into the virtual machine stack. This * is infallible. * * @param callDepth the distance between the entry frame into our trace and * cx->fp when we make this call. If this is not called as a * result of a nested exit, callDepth is 0. * @param mp an array of JSTraceTypes that indicate what the types of the things * on the stack are. * @param np pointer to the native stack. We want to copy values from here to * the JS stack as needed. * @param stopFrame if non-null, this frame and everything above it should not * be restored. * @return the number of things we popped off of np. */ static JS_REQUIRES_STACK int FlushNativeStackFrame(JSContext* cx, unsigned callDepth, JSTraceType* mp, double* np, JSStackFrame* stopFrame) { jsval* stopAt = stopFrame ? &stopFrame->argv[-2] : NULL; /* Root all string and object references first (we don't need to call the GC for this). */ FlushNativeStackFrameVisitor visitor(cx, mp, np, stopAt); VisitStackSlots(visitor, cx, callDepth); // Restore thisp from the now-restored argv[-1] in each pending frame. // Keep in mind that we didn't restore frames at stopFrame and above! // Scope to keep |fp| from leaking into the macros we're using. { unsigned n = callDepth+1; // +1 to make sure we restore the entry frame JSStackFrame* fp = cx->fp; if (stopFrame) { for (; fp != stopFrame; fp = fp->down) { JS_ASSERT(n != 0); --n; } // Skip over stopFrame itself. JS_ASSERT(n != 0); --n; fp = fp->down; } for (; n != 0; fp = fp->down) { --n; if (fp->callee) { /* * We might return from trace with a different callee object, but it still * has to be the same JSFunction (FIXME: bug 471425, eliminate fp->callee). */ JS_ASSERT(JSVAL_IS_OBJECT(fp->argv[-1])); JS_ASSERT(HAS_FUNCTION_CLASS(JSVAL_TO_OBJECT(fp->argv[-2]))); JS_ASSERT(GET_FUNCTION_PRIVATE(cx, JSVAL_TO_OBJECT(fp->argv[-2])) == GET_FUNCTION_PRIVATE(cx, fp->callee)); JS_ASSERT(GET_FUNCTION_PRIVATE(cx, fp->callee) == fp->fun); fp->callee = JSVAL_TO_OBJECT(fp->argv[-2]); /* * SynthesizeFrame sets scopeChain to NULL, because we can't calculate the * correct scope chain until we have the final callee. Calculate the real * scope object here. */ if (!fp->scopeChain) { fp->scopeChain = OBJ_GET_PARENT(cx, fp->callee); if (fp->fun->flags & JSFUN_HEAVYWEIGHT) { /* * Set hookData to null because the failure case for js_GetCallObject * involves it calling the debugger hook. * * Allocating the Call object must not fail, so use an object * previously reserved by js_ExecuteTree if needed. */ void* hookData = ((JSInlineFrame*)fp)->hookData; ((JSInlineFrame*)fp)->hookData = NULL; JS_ASSERT(!JS_TRACE_MONITOR(cx).useReservedObjects); JS_TRACE_MONITOR(cx).useReservedObjects = JS_TRUE; #ifdef DEBUG JSObject *obj = #endif js_GetCallObject(cx, fp); JS_ASSERT(obj); JS_TRACE_MONITOR(cx).useReservedObjects = JS_FALSE; ((JSInlineFrame*)fp)->hookData = hookData; } } fp->thisp = JSVAL_TO_OBJECT(fp->argv[-1]); if (fp->flags & JSFRAME_CONSTRUCTING) // constructors always compute 'this' fp->flags |= JSFRAME_COMPUTED_THIS; } } } debug_only_print0(LC_TMTracer, "\n"); return visitor.getTypeMap() - mp; } /* Emit load instructions onto the trace that read the initial stack state. */ JS_REQUIRES_STACK void TraceRecorder::import(LIns* base, ptrdiff_t offset, jsval* p, JSTraceType t, const char *prefix, uintN index, JSStackFrame *fp) { LIns* ins; if (t == TT_INT32) { /* demoted */ JS_ASSERT(isInt32(*p)); /* Ok, we have a valid demotion attempt pending, so insert an integer read and promote it to double since all arithmetic operations expect to see doubles on entry. The first op to use this slot will emit a f2i cast which will cancel out the i2f we insert here. */ ins = lir->insLoadi(base, offset); ins = lir->ins1(LIR_i2f, ins); } else { JS_ASSERT_IF(t != TT_JSVAL, isNumber(*p) == (t == TT_DOUBLE)); if (t == TT_DOUBLE) { ins = lir->insLoad(LIR_ldq, base, offset); } else if (t == TT_PSEUDOBOOLEAN) { ins = lir->insLoad(LIR_ld, base, offset); } else { ins = lir->insLoad(LIR_ldp, base, offset); } } checkForGlobalObjectReallocation(); tracker.set(p, ins); #ifdef DEBUG char name[64]; JS_ASSERT(strlen(prefix) < 10); void* mark = NULL; jsuword* localNames = NULL; const char* funName = NULL; if (*prefix == 'a' || *prefix == 'v') { mark = JS_ARENA_MARK(&cx->tempPool); if (fp->fun->hasLocalNames()) localNames = js_GetLocalNameArray(cx, fp->fun, &cx->tempPool); funName = fp->fun->atom ? js_AtomToPrintableString(cx, fp->fun->atom) : ""; } if (!strcmp(prefix, "argv")) { if (index < fp->fun->nargs) { JSAtom *atom = JS_LOCAL_NAME_TO_ATOM(localNames[index]); JS_snprintf(name, sizeof name, "$%s.%s", funName, js_AtomToPrintableString(cx, atom)); } else { JS_snprintf(name, sizeof name, "$%s.", funName, index); } } else if (!strcmp(prefix, "vars")) { JSAtom *atom = JS_LOCAL_NAME_TO_ATOM(localNames[fp->fun->nargs + index]); JS_snprintf(name, sizeof name, "$%s.%s", funName, js_AtomToPrintableString(cx, atom)); } else { JS_snprintf(name, sizeof name, "$%s%d", prefix, index); } if (mark) JS_ARENA_RELEASE(&cx->tempPool, mark); addName(ins, name); static const char* typestr[] = { "object", "int", "double", "jsval", "string", "null", "boolean", "function" }; debug_only_printf(LC_TMTracer, "import vp=%p name=%s type=%s flags=%d\n", (void*)p, name, typestr[t & 7], t >> 3); #endif } class ImportGlobalSlotVisitor : public SlotVisitorBase { TraceRecorder &mRecorder; LIns *mBase; JSTraceType *mTypemap; public: ImportGlobalSlotVisitor(TraceRecorder &recorder, LIns *base, JSTraceType *typemap) : mRecorder(recorder), mBase(base), mTypemap(typemap) {} JS_REQUIRES_STACK JS_ALWAYS_INLINE void visitGlobalSlot(jsval *vp, unsigned n, unsigned slot) { JS_ASSERT(*mTypemap != TT_JSVAL); mRecorder.import(mBase, mRecorder.nativeGlobalOffset(vp), vp, *mTypemap++, "global", n, NULL); } }; class ImportBoxedStackSlotVisitor : public SlotVisitorBase { TraceRecorder &mRecorder; LIns *mBase; ptrdiff_t mStackOffset; JSTraceType *mTypemap; JSStackFrame *mFp; public: ImportBoxedStackSlotVisitor(TraceRecorder &recorder, LIns *base, ptrdiff_t stackOffset, JSTraceType *typemap) : mRecorder(recorder), mBase(base), mStackOffset(stackOffset), mTypemap(typemap) {} JS_REQUIRES_STACK JS_ALWAYS_INLINE bool visitStackSlots(jsval *vp, size_t count, JSStackFrame* fp) { for (size_t i = 0; i < count; ++i) { if (*mTypemap == TT_JSVAL) { mRecorder.import(mBase, mStackOffset, vp, TT_JSVAL, "jsval", i, fp); LIns *vp_ins = mRecorder.get(vp); mRecorder.unbox_jsval(*vp, vp_ins, mRecorder.copy(mRecorder.anchor)); mRecorder.set(vp, vp_ins); } vp++; mTypemap++; mStackOffset += sizeof(double); } return true; } }; class ImportUnboxedStackSlotVisitor : public SlotVisitorBase { TraceRecorder &mRecorder; LIns *mBase; ptrdiff_t mStackOffset; JSTraceType *mTypemap; JSStackFrame *mFp; public: ImportUnboxedStackSlotVisitor(TraceRecorder &recorder, LIns *base, ptrdiff_t stackOffset, JSTraceType *typemap) : mRecorder(recorder), mBase(base), mStackOffset(stackOffset), mTypemap(typemap) {} JS_REQUIRES_STACK JS_ALWAYS_INLINE bool visitStackSlots(jsval *vp, size_t count, JSStackFrame* fp) { for (size_t i = 0; i < count; ++i) { if (*mTypemap != TT_JSVAL) { mRecorder.import(mBase, mStackOffset, vp++, *mTypemap, stackSlotKind(), i, fp); } mTypemap++; mStackOffset += sizeof(double); } return true; } }; JS_REQUIRES_STACK void TraceRecorder::import(TreeInfo* treeInfo, LIns* sp, unsigned stackSlots, unsigned ngslots, unsigned callDepth, JSTraceType* typeMap) { /* If we get a partial list that doesn't have all the types (i.e. recording from a side exit that was recorded but we added more global slots later), merge the missing types from the entry type map. This is safe because at the loop edge we verify that we have compatible types for all globals (entry type and loop edge type match). While a different trace of the tree might have had a guard with a different type map for these slots we just filled in here (the guard we continue from didn't know about them), since we didn't take that particular guard the only way we could have ended up here is if that other trace had at its end a compatible type distribution with the entry map. Since thats exactly what we used to fill in the types our current side exit didn't provide, this is always safe to do. */ JSTraceType* globalTypeMap = typeMap + stackSlots; unsigned length = treeInfo->nGlobalTypes(); /* * This is potentially the typemap of the side exit and thus shorter than the tree's * global type map. */ if (ngslots < length) { mergeTypeMaps(&globalTypeMap/*out param*/, &ngslots/*out param*/, treeInfo->globalTypeMap(), length, (JSTraceType*)alloca(sizeof(JSTraceType) * length)); } JS_ASSERT(ngslots == treeInfo->nGlobalTypes()); ptrdiff_t offset = -treeInfo->nativeStackBase; /* * Check whether there are any values on the stack we have to unbox and * do that first before we waste any time fetching the state from the * stack. */ ImportBoxedStackSlotVisitor boxedStackVisitor(*this, sp, offset, typeMap); VisitStackSlots(boxedStackVisitor, cx, callDepth); ImportGlobalSlotVisitor globalVisitor(*this, lirbuf->state, globalTypeMap); VisitGlobalSlots(globalVisitor, cx, globalObj, ngslots, treeInfo->globalSlots->data()); ImportUnboxedStackSlotVisitor unboxedStackVisitor(*this, sp, offset, typeMap); VisitStackSlots(unboxedStackVisitor, cx, callDepth); } JS_REQUIRES_STACK bool TraceRecorder::isValidSlot(JSScope* scope, JSScopeProperty* sprop) { uint32 setflags = (js_CodeSpec[*cx->fp->regs->pc].format & (JOF_SET | JOF_INCDEC | JOF_FOR)); if (setflags) { if (!SPROP_HAS_STUB_SETTER(sprop)) ABORT_TRACE_RV("non-stub setter", false); if (sprop->attrs & JSPROP_READONLY) ABORT_TRACE_RV("writing to a read-only property", false); } /* This check applies even when setflags == 0. */ if (setflags != JOF_SET && !SPROP_HAS_STUB_GETTER(sprop)) ABORT_TRACE_RV("non-stub getter", false); if (!SPROP_HAS_VALID_SLOT(sprop, scope)) ABORT_TRACE_RV("slotless obj property", false); return true; } /* Lazily import a global slot if we don't already have it in the tracker. */ JS_REQUIRES_STACK bool TraceRecorder::lazilyImportGlobalSlot(unsigned slot) { if (slot != uint16(slot)) /* we use a table of 16-bit ints, bail out if that's not enough */ return false; /* * If the global object grows too large, alloca in js_ExecuteTree might fail, so * abort tracing on global objects with unreasonably many slots. */ if (STOBJ_NSLOTS(globalObj) > MAX_GLOBAL_SLOTS) return false; jsval* vp = &STOBJ_GET_SLOT(globalObj, slot); if (known(vp)) return true; /* we already have it */ unsigned index = treeInfo->globalSlots->length(); /* Add the slot to the list of interned global slots. */ JS_ASSERT(treeInfo->nGlobalTypes() == treeInfo->globalSlots->length()); treeInfo->globalSlots->add(slot); JSTraceType type = getCoercedType(*vp); if (type == TT_INT32 && oracle.isGlobalSlotUndemotable(cx, slot)) type = TT_DOUBLE; treeInfo->typeMap.add(type); import(lirbuf->state, sizeof(struct InterpState) + slot*sizeof(double), vp, type, "global", index, NULL); specializeTreesToMissingGlobals(cx, globalObj, treeInfo); return true; } /* Write back a value onto the stack or global frames. */ LIns* TraceRecorder::writeBack(LIns* i, LIns* base, ptrdiff_t offset) { /* Sink all type casts targeting the stack into the side exit by simply storing the original (uncasted) value. Each guard generates the side exit map based on the types of the last stores to every stack location, so its safe to not perform them on-trace. */ if (isPromoteInt(i)) i = ::demote(lir, i); return lir->insStorei(i, base, offset); } /* Update the tracker, then issue a write back store. */ JS_REQUIRES_STACK void TraceRecorder::set(jsval* p, LIns* i, bool initializing) { JS_ASSERT(i != NULL); JS_ASSERT(initializing || known(p)); checkForGlobalObjectReallocation(); tracker.set(p, i); /* If we are writing to this location for the first time, calculate the offset into the native frame manually, otherwise just look up the last load or store associated with the same source address (p) and use the same offset/base. */ LIns* x = nativeFrameTracker.get(p); if (!x) { if (isGlobal(p)) x = writeBack(i, lirbuf->state, nativeGlobalOffset(p)); else x = writeBack(i, lirbuf->sp, -treeInfo->nativeStackBase + nativeStackOffset(p)); nativeFrameTracker.set(p, x); } else { #define ASSERT_VALID_CACHE_HIT(base, offset) \ JS_ASSERT(base == lirbuf->sp || base == lirbuf->state); \ JS_ASSERT(offset == ((base == lirbuf->sp) \ ? -treeInfo->nativeStackBase + nativeStackOffset(p) \ : nativeGlobalOffset(p))); \ JS_ASSERT(x->isop(LIR_sti) || x->isop(LIR_stqi)); ASSERT_VALID_CACHE_HIT(x->oprnd2(), x->immdisp()); writeBack(i, x->oprnd2(), x->immdisp()); } #undef ASSERT_VALID_CACHE_HIT } JS_REQUIRES_STACK LIns* TraceRecorder::get(jsval* p) { checkForGlobalObjectReallocation(); return tracker.get(p); } JS_REQUIRES_STACK bool TraceRecorder::known(jsval* p) { checkForGlobalObjectReallocation(); return tracker.has(p); } /* * The dslots of the global object are sometimes reallocated by the interpreter. * This function check for that condition and re-maps the entries of the tracker * accordingly. */ JS_REQUIRES_STACK void TraceRecorder::checkForGlobalObjectReallocation() { if (global_dslots != globalObj->dslots) { debug_only_print0(LC_TMTracer, "globalObj->dslots relocated, updating tracker\n"); jsval* src = global_dslots; jsval* dst = globalObj->dslots; jsuint length = globalObj->dslots[-1] - JS_INITIAL_NSLOTS; LIns** map = (LIns**)alloca(sizeof(LIns*) * length); for (jsuint n = 0; n < length; ++n) { map[n] = tracker.get(src); tracker.set(src++, NULL); } for (jsuint n = 0; n < length; ++n) tracker.set(dst++, map[n]); global_dslots = globalObj->dslots; } } /* Determine whether the current branch is a loop edge (taken or not taken). */ static JS_REQUIRES_STACK bool js_IsLoopEdge(jsbytecode* pc, jsbytecode* header) { switch (*pc) { case JSOP_IFEQ: case JSOP_IFNE: return ((pc + GET_JUMP_OFFSET(pc)) == header); case JSOP_IFEQX: case JSOP_IFNEX: return ((pc + GET_JUMPX_OFFSET(pc)) == header); default: JS_ASSERT((*pc == JSOP_AND) || (*pc == JSOP_ANDX) || (*pc == JSOP_OR) || (*pc == JSOP_ORX)); } return false; } class AdjustCallerGlobalTypesVisitor : public SlotVisitorBase { TraceRecorder &mRecorder; JSContext *mCx; nanojit::LirBuffer *mLirbuf; nanojit::LirWriter *mLir; JSTraceType *mTypeMap; public: AdjustCallerGlobalTypesVisitor(TraceRecorder &recorder, JSTraceType *typeMap) : mRecorder(recorder), mCx(mRecorder.cx), mLirbuf(mRecorder.lirbuf), mLir(mRecorder.lir), mTypeMap(typeMap) {} JSTraceType* getTypeMap() { return mTypeMap; } JS_REQUIRES_STACK JS_ALWAYS_INLINE void visitGlobalSlot(jsval *vp, unsigned n, unsigned slot) { LIns *ins = mRecorder.get(vp); bool isPromote = isPromoteInt(ins); if (isPromote && *mTypeMap == TT_DOUBLE) { mLir->insStorei(mRecorder.get(vp), mLirbuf->state, mRecorder.nativeGlobalOffset(vp)); /* Aggressively undo speculation so the inner tree will compile if this fails. */ oracle.markGlobalSlotUndemotable(mCx, slot); } JS_ASSERT(!(!isPromote && *mTypeMap == TT_INT32)); ++mTypeMap; } }; class AdjustCallerStackTypesVisitor : public SlotVisitorBase { TraceRecorder &mRecorder; JSContext *mCx; nanojit::LirBuffer *mLirbuf; nanojit::LirWriter *mLir; unsigned mSlotnum; JSTraceType *mTypeMap; public: AdjustCallerStackTypesVisitor(TraceRecorder &recorder, JSTraceType *typeMap) : mRecorder(recorder), mCx(mRecorder.cx), mLirbuf(mRecorder.lirbuf), mLir(mRecorder.lir), mSlotnum(0), mTypeMap(typeMap) {} JSTraceType* getTypeMap() { return mTypeMap; } JS_REQUIRES_STACK JS_ALWAYS_INLINE bool visitStackSlots(jsval *vp, size_t count, JSStackFrame* fp) { for (size_t i = 0; i < count; ++i) { LIns *ins = mRecorder.get(vp); bool isPromote = isPromoteInt(ins); if (isPromote && *mTypeMap == TT_DOUBLE) { mLir->insStorei(mRecorder.get(vp), mLirbuf->sp, -mRecorder.treeInfo->nativeStackBase + mRecorder.nativeStackOffset(vp)); /* Aggressively undo speculation so the inner tree will compile if this fails. */ oracle.markStackSlotUndemotable(mCx, mSlotnum); } JS_ASSERT(!(!isPromote && *mTypeMap == TT_INT32)); ++vp; ++mTypeMap; ++mSlotnum; } return true; } }; /* * Promote slots if necessary to match the called tree's type map. This function is * infallible and must only be called if we are certain that it is possible to * reconcile the types for each slot in the inner and outer trees. */ JS_REQUIRES_STACK void TraceRecorder::adjustCallerTypes(Fragment* f) { TreeInfo* ti = (TreeInfo*)f->vmprivate; AdjustCallerGlobalTypesVisitor globalVisitor(*this, ti->globalTypeMap()); VisitGlobalSlots(globalVisitor, cx, *treeInfo->globalSlots); AdjustCallerStackTypesVisitor stackVisitor(*this, ti->stackTypeMap()); VisitStackSlots(stackVisitor, cx, 0); JS_ASSERT(f == f->root); } JS_REQUIRES_STACK JSTraceType TraceRecorder::determineSlotType(jsval* vp) { JSTraceType m; LIns* i = get(vp); if (isNumber(*vp)) { m = isPromoteInt(i) ? TT_INT32 : TT_DOUBLE; } else if (JSVAL_IS_OBJECT(*vp)) { if (JSVAL_IS_NULL(*vp)) m = TT_NULL; else if (HAS_FUNCTION_CLASS(JSVAL_TO_OBJECT(*vp))) m = TT_FUNCTION; else m = TT_OBJECT; } else { JS_ASSERT(JSVAL_TAG(*vp) == JSVAL_STRING || JSVAL_TAG(*vp) == JSVAL_BOOLEAN); JS_STATIC_ASSERT(TT_STRING == JSVAL_STRING); JS_STATIC_ASSERT(TT_PSEUDOBOOLEAN == JSVAL_BOOLEAN); m = JSTraceType(JSVAL_TAG(*vp)); } JS_ASSERT(m != TT_INT32 || isInt32(*vp)); return m; } class DetermineTypesVisitor : public SlotVisitorBase { TraceRecorder &mRecorder; JSTraceType *mTypeMap; public: DetermineTypesVisitor(TraceRecorder &recorder, JSTraceType *typeMap) : mRecorder(recorder), mTypeMap(typeMap) {} JS_REQUIRES_STACK JS_ALWAYS_INLINE void visitGlobalSlot(jsval *vp, unsigned n, unsigned slot) { *mTypeMap++ = mRecorder.determineSlotType(vp); } JS_REQUIRES_STACK JS_ALWAYS_INLINE bool visitStackSlots(jsval *vp, size_t count, JSStackFrame* fp) { for (size_t i = 0; i < count; ++i) *mTypeMap++ = mRecorder.determineSlotType(vp++); return true; } JSTraceType* getTypeMap() { return mTypeMap; } }; JS_REQUIRES_STACK VMSideExit* TraceRecorder::snapshot(ExitType exitType) { JSStackFrame* fp = cx->fp; JSFrameRegs* regs = fp->regs; jsbytecode* pc = regs->pc; /* Check for a return-value opcode that needs to restart at the next instruction. */ const JSCodeSpec& cs = js_CodeSpec[*pc]; /* * When calling a _FAIL native, make the snapshot's pc point to the next * instruction after the CALL or APPLY. Even on failure, a _FAIL native must not * be called again from the interpreter. */ bool resumeAfter = (pendingTraceableNative && JSTN_ERRTYPE(pendingTraceableNative) == FAIL_STATUS); if (resumeAfter) { JS_ASSERT(*pc == JSOP_CALL || *pc == JSOP_APPLY || *pc == JSOP_NEW); pc += cs.length; regs->pc = pc; MUST_FLOW_THROUGH("restore_pc"); } /* Generate the entry map for the (possibly advanced) pc and stash it in the trace. */ unsigned stackSlots = js_NativeStackSlots(cx, callDepth); /* It's sufficient to track the native stack use here since all stores above the stack watermark defined by guards are killed. */ trackNativeStackUse(stackSlots + 1); /* Capture the type map into a temporary location. */ unsigned ngslots = treeInfo->globalSlots->length(); unsigned typemap_size = (stackSlots + ngslots) * sizeof(JSTraceType); JSTraceType* typemap = (JSTraceType*)alloca(typemap_size); /* * Determine the type of a store by looking at the current type of the * actual value the interpreter is using. For numbers we have to check * what kind of store we used last (integer or double) to figure out * what the side exit show reflect in its typemap. */ DetermineTypesVisitor detVisitor(*this, typemap); VisitSlots(detVisitor, cx, callDepth, ngslots, treeInfo->globalSlots->data()); JS_ASSERT(unsigned(detVisitor.getTypeMap() - typemap) == ngslots + stackSlots); /* * If we are currently executing a traceable native or we are attaching a second trace * to it, the value on top of the stack is a jsval. Make a note of this in the typemap. */ if (pendingTraceableNative && (pendingTraceableNative->flags & JSTN_UNBOX_AFTER)) typemap[stackSlots - 1] = TT_JSVAL; /* Now restore the the original pc (after which early returns are ok). */ if (resumeAfter) { MUST_FLOW_LABEL(restore_pc); regs->pc = pc - cs.length; } else { /* If we take a snapshot on a goto, advance to the target address. This avoids inner trees returning on a break goto, which the outer recorder then would confuse with a break in the outer tree. */ if (*pc == JSOP_GOTO) pc += GET_JUMP_OFFSET(pc); else if (*pc == JSOP_GOTOX) pc += GET_JUMPX_OFFSET(pc); } /* * Check if we already have a matching side exit; if so we can return that * side exit instead of creating a new one. */ VMSideExit** exits = treeInfo->sideExits.data(); unsigned nexits = treeInfo->sideExits.length(); if (exitType == LOOP_EXIT) { for (unsigned n = 0; n < nexits; ++n) { VMSideExit* e = exits[n]; if (e->pc == pc && e->imacpc == fp->imacpc && ngslots == e->numGlobalSlots && !memcmp(getFullTypeMap(exits[n]), typemap, typemap_size)) { AUDIT(mergedLoopExits); return e; } } } if (sizeof(VMSideExit) + (stackSlots + ngslots) * sizeof(JSTraceType) >= NJ_MAX_SKIP_PAYLOAD_SZB) { /* * ::snapshot() is infallible in the sense that callers don't * expect errors; but this is a trace-aborting error condition. So * mangle the request to consume zero slots, and mark the tree as * to-be-trashed. This should be safe as the trace will be aborted * before assembly or execution due to the call to * trackNativeStackUse above. */ stackSlots = 0; ngslots = 0; trashSelf = true; } /* We couldn't find a matching side exit, so create a new one. */ LIns* data = lir->insSkip(sizeof(VMSideExit) + (stackSlots + ngslots) * sizeof(JSTraceType)); VMSideExit* exit = (VMSideExit*) data->payload(); /* Setup side exit structure. */ memset(exit, 0, sizeof(VMSideExit)); exit->from = fragment; exit->calldepth = callDepth; exit->numGlobalSlots = ngslots; exit->numStackSlots = stackSlots; exit->numStackSlotsBelowCurrentFrame = cx->fp->callee ? nativeStackOffset(&cx->fp->argv[-2])/sizeof(double) : 0; exit->exitType = exitType; exit->block = fp->blockChain; exit->pc = pc; exit->imacpc = fp->imacpc; exit->sp_adj = (stackSlots * sizeof(double)) - treeInfo->nativeStackBase; exit->rp_adj = exit->calldepth * sizeof(FrameInfo*); exit->nativeCalleeWord = 0; memcpy(getFullTypeMap(exit), typemap, typemap_size); return exit; } JS_REQUIRES_STACK LIns* TraceRecorder::createGuardRecord(VMSideExit* exit) { LIns* guardRec = lir->insSkip(sizeof(GuardRecord)); GuardRecord* gr = (GuardRecord*) guardRec->payload(); memset(gr, 0, sizeof(GuardRecord)); gr->exit = exit; exit->addGuard(gr); return guardRec; } /* * Emit a guard for condition (cond), expecting to evaluate to boolean result * (expected) and using the supplied side exit if the conditon doesn't hold. */ JS_REQUIRES_STACK void TraceRecorder::guard(bool expected, LIns* cond, VMSideExit* exit) { debug_only_printf(LC_TMRecorder, " About to try emitting guard code for " "SideExit=%p exitType=%s\n", (void*)exit, getExitName(exit->exitType)); LIns* guardRec = createGuardRecord(exit); /* * BIG FAT WARNING: If compilation fails we don't reset the lirbuf, so it's * safe to keep references to the side exits here. If we ever start * rewinding those lirbufs, we have to make sure we purge the side exits * that then no longer will be in valid memory. */ if (exit->exitType == LOOP_EXIT) treeInfo->sideExits.add(exit); if (!cond->isCond()) { expected = !expected; cond = lir->ins_eq0(cond); } LIns* guardIns = lir->insGuard(expected ? LIR_xf : LIR_xt, cond, guardRec); if (!guardIns) { debug_only_print0(LC_TMRecorder, " redundant guard, eliminated, no codegen\n"); } } JS_REQUIRES_STACK VMSideExit* TraceRecorder::copy(VMSideExit* copy) { size_t typemap_size = copy->numGlobalSlots + copy->numStackSlots; LIns* data = lir->insSkip(sizeof(VMSideExit) + typemap_size * sizeof(JSTraceType)); VMSideExit* exit = (VMSideExit*) data->payload(); /* Copy side exit structure. */ memcpy(exit, copy, sizeof(VMSideExit) + typemap_size * sizeof(JSTraceType)); exit->guards = NULL; exit->from = fragment; exit->target = NULL; /* * BIG FAT WARNING: If compilation fails we don't reset the lirbuf, so it's * safe to keep references to the side exits here. If we ever start * rewinding those lirbufs, we have to make sure we purge the side exits * that then no longer will be in valid memory. */ if (exit->exitType == LOOP_EXIT) treeInfo->sideExits.add(exit); return exit; } /* Emit a guard for condition (cond), expecting to evaluate to boolean result (expected) and generate a side exit with type exitType to jump to if the condition does not hold. */ JS_REQUIRES_STACK void TraceRecorder::guard(bool expected, LIns* cond, ExitType exitType) { guard(expected, cond, snapshot(exitType)); } /* Try to match the type of a slot to type t. checkType is used to verify that the type of * values flowing into the loop edge is compatible with the type we expect in the loop header. * * @param v Value. * @param t Typemap entry for value. * @param stage_val Outparam for set() address. * @param stage_ins Outparam for set() instruction. * @param stage_count Outparam for set() buffer count. * @return True if types are compatible, false otherwise. */ JS_REQUIRES_STACK bool TraceRecorder::checkType(jsval& v, JSTraceType t, jsval*& stage_val, LIns*& stage_ins, unsigned& stage_count) { if (t == TT_INT32) { /* initially all whole numbers cause the slot to be demoted */ debug_only_printf(LC_TMTracer, "checkType(tag=1, t=%d, isnum=%d, i2f=%d) stage_count=%d\n", t, isNumber(v), isPromoteInt(get(&v)), stage_count); if (!isNumber(v)) return false; /* not a number? type mismatch */ LIns* i = get(&v); /* This is always a type mismatch, we can't close a double to an int. */ if (!isPromoteInt(i)) return false; /* Looks good, slot is an int32, the last instruction should be promotable. */ JS_ASSERT(isInt32(v) && isPromoteInt(i)); /* Overwrite the value in this slot with the argument promoted back to an integer. */ stage_val = &v; stage_ins = f2i(i); stage_count++; return true; } if (t == TT_DOUBLE) { debug_only_printf(LC_TMTracer, "checkType(tag=2, t=%d, isnum=%d, promote=%d) stage_count=%d\n", t, isNumber(v), isPromoteInt(get(&v)), stage_count); if (!isNumber(v)) return false; /* not a number? type mismatch */ LIns* i = get(&v); /* We sink i2f conversions into the side exit, but at the loop edge we have to make sure we promote back to double if at loop entry we want a double. */ if (isPromoteInt(i)) { stage_val = &v; stage_ins = lir->ins1(LIR_i2f, i); stage_count++; } return true; } if (t == TT_NULL) return JSVAL_IS_NULL(v); if (t == TT_FUNCTION) return !JSVAL_IS_PRIMITIVE(v) && HAS_FUNCTION_CLASS(JSVAL_TO_OBJECT(v)); if (t == TT_OBJECT) return !JSVAL_IS_PRIMITIVE(v) && !HAS_FUNCTION_CLASS(JSVAL_TO_OBJECT(v)); /* for non-number types we expect a precise match of the type */ JSTraceType vt = getCoercedType(v); #ifdef DEBUG if (vt != t) { debug_only_printf(LC_TMTracer, "Type mismatch: val %c, map %c ", typeChar[vt], typeChar[t]); } #endif debug_only_printf(LC_TMTracer, "checkType(vt=%d, t=%d) stage_count=%d\n", (int) vt, t, stage_count); return vt == t; } class SelfTypeStabilityVisitor : public SlotVisitorBase { TraceRecorder &mRecorder; JSTraceType *mTypeMap; JSContext *mCx; bool &mDemote; jsval **&mStageVals; LIns **&mStageIns; unsigned &mStageCount; unsigned mStackSlotNum; bool mOk; public: SelfTypeStabilityVisitor(TraceRecorder &recorder, JSTraceType *typeMap, bool &demote, jsval **&stageVals, LIns **&stageIns, unsigned &stageCount) : mRecorder(recorder), mTypeMap(typeMap), mCx(mRecorder.cx), mDemote(demote), mStageVals(stageVals), mStageIns(stageIns), mStageCount(stageCount), mStackSlotNum(0), mOk(true) {} JS_REQUIRES_STACK JS_ALWAYS_INLINE void visitGlobalSlot(jsval *vp, unsigned n, unsigned slot) { if (mOk) { debug_only_printf(LC_TMTracer, "global%d ", n); if (!mRecorder.checkType(*vp, *mTypeMap, mStageVals[mStageCount], mStageIns[mStageCount], mStageCount)) { /* If the failure was an int->double, tell the oracle. */ if (*mTypeMap == TT_INT32 && isNumber(*vp) && !isPromoteInt(mRecorder.get(vp))) { oracle.markGlobalSlotUndemotable(mCx, slot); mDemote = true; } else { mOk = false; } } mTypeMap++; } } JS_REQUIRES_STACK JS_ALWAYS_INLINE bool visitStackSlots(jsval *vp, size_t count, JSStackFrame* fp) { for (size_t i = 0; i < count; ++i) { debug_only_printf(LC_TMTracer, "%s%u ", stackSlotKind(), unsigned(i)); if (!mRecorder.checkType(*vp, *mTypeMap, mStageVals[mStageCount], mStageIns[mStageCount], mStageCount)) { if (*mTypeMap == TT_INT32 && isNumber(*vp) && !isPromoteInt(mRecorder.get(vp))) { oracle.markStackSlotUndemotable(mCx, mStackSlotNum); mDemote = true; } else { mOk = false; break; } } vp++; mTypeMap++; mStackSlotNum++; } return mOk; } bool isOk() { return mOk; } }; class PeerTypeStabilityVisitor : public SlotVisitorBase { TraceRecorder &mRecorder; JSTraceType *mTypeMap; jsval **&mStageVals; LIns **&mStageIns; unsigned &mStageCount; bool mOk; public: PeerTypeStabilityVisitor(TraceRecorder &recorder, JSTraceType *typeMap, jsval **&stageVals, LIns **&stageIns, unsigned &stageCount) : mRecorder(recorder), mTypeMap(typeMap), mStageVals(stageVals), mStageIns(stageIns), mStageCount(stageCount), mOk(true) {} JS_REQUIRES_STACK JS_ALWAYS_INLINE void check(jsval *vp) { if (!mRecorder.checkType(*vp, *mTypeMap++, mStageVals[mStageCount], mStageIns[mStageCount], mStageCount)) mOk = false; } JS_REQUIRES_STACK JS_ALWAYS_INLINE void visitGlobalSlot(jsval *vp, unsigned n, unsigned slot) { if (mOk) check(vp); } JS_REQUIRES_STACK JS_REQUIRES_STACK JS_ALWAYS_INLINE bool visitStackSlots(jsval *vp, size_t count, JSStackFrame* fp) { for (size_t i = 0; i < count; ++i) { check(vp++); if (!mOk) break; } return mOk; } bool isOk() { return mOk; } }; class UndemoteVisitor : public SlotVisitorBase { TraceRecorder &mRecorder; JSContext *mCx; JSTraceType *mTypeMap; unsigned mStackSlotNum; public: UndemoteVisitor(TraceRecorder &recorder, JSTraceType *typeMap) : mRecorder(recorder), mCx(mRecorder.cx), mTypeMap(typeMap), mStackSlotNum(0) {} JS_REQUIRES_STACK JS_ALWAYS_INLINE void visitGlobalSlot(jsval *vp, unsigned n, unsigned slot) { if (*mTypeMap == TT_INT32) { JS_ASSERT(isNumber(*vp)); if (!isPromoteInt(mRecorder.get(vp))) oracle.markGlobalSlotUndemotable(mCx, slot); } else if (*mTypeMap == TT_DOUBLE) { JS_ASSERT(isNumber(*vp)); oracle.markGlobalSlotUndemotable(mCx, slot); } else { JS_ASSERT(*mTypeMap == TT_OBJECT ? !JSVAL_IS_PRIMITIVE(*vp) && !HAS_FUNCTION_CLASS(JSVAL_TO_OBJECT(*vp)) : *mTypeMap == TT_STRING ? JSVAL_IS_STRING(*vp) : *mTypeMap == TT_PSEUDOBOOLEAN && JSVAL_TAG(*vp) == JSVAL_BOOLEAN); } mTypeMap++; } JS_REQUIRES_STACK JS_ALWAYS_INLINE bool visitStackSlots(jsval *vp, size_t count, JSStackFrame* fp) { for (size_t i = 0; i < count; ++i) { if (*mTypeMap == TT_INT32) { JS_ASSERT(isNumber(*vp)); if (!isPromoteInt(mRecorder.get(vp))) oracle.markStackSlotUndemotable(mCx, mStackSlotNum); } else if (*mTypeMap == TT_DOUBLE) { JS_ASSERT(isNumber(*vp)); oracle.markStackSlotUndemotable(mCx, mStackSlotNum); } else { JS_ASSERT(*mTypeMap == TT_NULL ? JSVAL_IS_NULL(*vp) : *mTypeMap == TT_FUNCTION ? !JSVAL_IS_PRIMITIVE(*vp) && HAS_FUNCTION_CLASS(JSVAL_TO_OBJECT(*vp)) : *mTypeMap == TT_OBJECT ? !JSVAL_IS_PRIMITIVE(*vp) && !HAS_FUNCTION_CLASS(JSVAL_TO_OBJECT(*vp)) : *mTypeMap == TT_STRING ? JSVAL_IS_STRING(*vp) : *mTypeMap == TT_PSEUDOBOOLEAN && JSVAL_TAG(*vp) == JSVAL_BOOLEAN); } mStackSlotNum++; mTypeMap++; vp++; } return true; } }; /** * Make sure that the current values in the given stack frame and all stack frames * up and including entryFrame are type-compatible with the entry map. * * @param root_peer First fragment in peer list. * @param stable_peer Outparam for first type stable peer. * @param demote True if stability was achieved through demotion. * @return True if type stable, false otherwise. */ JS_REQUIRES_STACK bool TraceRecorder::deduceTypeStability(Fragment* root_peer, Fragment** stable_peer, bool& demote) { JS_ASSERT(treeInfo->globalSlots->length() == treeInfo->nGlobalTypes()); if (stable_peer) *stable_peer = NULL; /* * Rather than calculate all of this stuff twice, it gets cached locally. The "stage" buffers * are for calls to set() that will change the exit types. */ bool success; unsigned stage_count; jsval** stage_vals = (jsval**)alloca(sizeof(jsval*) * (treeInfo->typeMap.length())); LIns** stage_ins = (LIns**)alloca(sizeof(LIns*) * (treeInfo->typeMap.length())); /* First run through and see if we can close ourselves - best case! */ stage_count = 0; success = false; debug_only_printf(LC_TMTracer, "Checking type stability against self=%p\n", (void*)fragment); SelfTypeStabilityVisitor selfVisitor(*this, treeInfo->stackTypeMap(), demote, stage_vals, stage_ins, stage_count); VisitSlots(selfVisitor, cx, 0, *treeInfo->globalSlots); success = selfVisitor.isOk(); /* If we got a success and we don't need to recompile, we should just close here. */ if (success && !demote) { for (unsigned i = 0; i < stage_count; i++) set(stage_vals[i], stage_ins[i]); return true; /* If we need to trash, don't bother checking peers. */ } else if (trashSelf) { return false; } demote = false; /* At this point the tree is about to be incomplete, so let's see if we can connect to any * peer fragment that is type stable. */ Fragment* f; TreeInfo* ti; for (f = root_peer; f != NULL; f = f->peer) { debug_only_printf(LC_TMTracer, "Checking type stability against peer=%p (code=%p)\n", (void*)f, f->code()); if (!f->code()) continue; ti = (TreeInfo*)f->vmprivate; /* Don't allow varying stack depths */ if ((ti->nStackTypes != treeInfo->nStackTypes) || (ti->typeMap.length() != treeInfo->typeMap.length()) || (ti->globalSlots->length() != treeInfo->globalSlots->length())) continue; stage_count = 0; success = false; PeerTypeStabilityVisitor peerVisitor(*this, ti->stackTypeMap(), stage_vals, stage_ins, stage_count); VisitSlots(peerVisitor, cx, 0, *treeInfo->globalSlots); success = peerVisitor.isOk(); if (success) { /* * There was a successful match. We don't care about restoring the saved staging, but * we do need to clear the original undemote list. */ for (unsigned i = 0; i < stage_count; i++) set(stage_vals[i], stage_ins[i]); if (stable_peer) *stable_peer = f; demote = false; return false; } } /* * If this is a loop trace and it would be stable with demotions, build an undemote list * and return true. Our caller should sniff this and trash the tree, recording a new one * that will assumedly stabilize. */ if (demote && fragment->kind == LoopTrace) { UndemoteVisitor visitor(*this, treeInfo->stackTypeMap()); VisitSlots(visitor, cx, 0, *treeInfo->globalSlots); return true; } else { demote = false; } return false; } static JS_REQUIRES_STACK void FlushJITCache(JSContext* cx) { if (!TRACING_ENABLED(cx)) return; JSTraceMonitor* tm = &JS_TRACE_MONITOR(cx); debug_only_print0(LC_TMTracer, "Flushing cache.\n"); if (tm->recorder) js_AbortRecording(cx, "flush cache"); TraceRecorder* tr; while ((tr = tm->abortStack) != NULL) { tr->removeFragmentoReferences(); tr->deepAbort(); tr->popAbortStack(); } Fragmento* fragmento = tm->fragmento; if (fragmento) { if (tm->prohibitFlush) { debug_only_print0(LC_TMTracer, "Deferring fragmento flush due to deep bail.\n"); tm->needFlush = JS_TRUE; return; } fragmento->clearFrags(); #ifdef DEBUG JS_ASSERT(fragmento->labels); fragmento->labels->clear(); #endif tm->lirbuf->rewind(); for (size_t i = 0; i < FRAGMENT_TABLE_SIZE; ++i) { VMFragment* f = tm->vmfragments[i]; while (f) { VMFragment* next = f->next; fragmento->clearFragment(f); f = next; } tm->vmfragments[i] = NULL; } for (size_t i = 0; i < MONITOR_N_GLOBAL_STATES; ++i) { tm->globalStates[i].globalShape = -1; tm->globalStates[i].globalSlots->clear(); } } tm->needFlush = JS_FALSE; } /* Compile the current fragment. */ JS_REQUIRES_STACK void TraceRecorder::compile(JSTraceMonitor* tm) { #ifdef MOZ_TRACEVIS TraceVisStateObj tvso(S_COMPILE); #endif if (tm->needFlush) { FlushJITCache(cx); return; } Fragmento* fragmento = tm->fragmento; if (treeInfo->maxNativeStackSlots >= MAX_NATIVE_STACK_SLOTS) { debug_only_print0(LC_TMTracer, "Blacklist: excessive stack use.\n"); js_Blacklist((jsbytecode*) fragment->root->ip); return; } if (anchor && anchor->exitType != CASE_EXIT) ++treeInfo->branchCount; if (lirbuf->outOMem()) { fragmento->assm()->setError(nanojit::OutOMem); return; } ::compile(fragmento->assm(), fragment); if (fragmento->assm()->error() == nanojit::OutOMem) return; if (fragmento->assm()->error() != nanojit::None) { debug_only_print0(LC_TMTracer, "Blacklisted: error during compilation\n"); js_Blacklist((jsbytecode*) fragment->root->ip); return; } js_resetRecordingAttempts(cx, (jsbytecode*) fragment->ip); js_resetRecordingAttempts(cx, (jsbytecode*) fragment->root->ip); if (anchor) { #ifdef NANOJIT_IA32 if (anchor->exitType == CASE_EXIT) fragmento->assm()->patch(anchor, anchor->switchInfo); else #endif fragmento->assm()->patch(anchor); } JS_ASSERT(fragment->code()); JS_ASSERT(!fragment->vmprivate); if (fragment == fragment->root) fragment->vmprivate = treeInfo; /* :TODO: windows support */ #if defined DEBUG && !defined WIN32 const char* filename = cx->fp->script->filename; char* label = (char*)malloc((filename ? strlen(filename) : 7) + 16); sprintf(label, "%s:%u", filename ? filename : "", js_FramePCToLineNumber(cx, cx->fp)); fragmento->labels->add(fragment, sizeof(Fragment), 0, label); free(label); #endif AUDIT(traceCompleted); } static bool js_JoinPeersIfCompatible(Fragmento* frago, Fragment* stableFrag, TreeInfo* stableTree, VMSideExit* exit) { JS_ASSERT(exit->numStackSlots == stableTree->nStackTypes); /* Must have a matching type unstable exit. */ if ((exit->numGlobalSlots + exit->numStackSlots != stableTree->typeMap.length()) || memcmp(getFullTypeMap(exit), stableTree->typeMap.data(), stableTree->typeMap.length())) { return false; } exit->target = stableFrag; frago->assm()->patch(exit); stableTree->dependentTrees.addUnique(exit->from->root); ((TreeInfo*)exit->from->root->vmprivate)->linkedTrees.addUnique(stableFrag); return true; } /* Complete and compile a trace and link it to the existing tree if appropriate. */ JS_REQUIRES_STACK void TraceRecorder::closeLoop(JSTraceMonitor* tm, bool& demote) { /* * We should have arrived back at the loop header, and hence we don't want to be in an imacro * here and the opcode should be either JSOP_LOOP, or in case this loop was blacklisted in the * meantime JSOP_NOP. */ JS_ASSERT((*cx->fp->regs->pc == JSOP_LOOP || *cx->fp->regs->pc == JSOP_NOP) && !cx->fp->imacpc); bool stable; Fragment* peer; VMFragment* peer_root; Fragmento* fragmento = tm->fragmento; if (callDepth != 0) { debug_only_print0(LC_TMTracer, "Blacklisted: stack depth mismatch, possible recursion.\n"); js_Blacklist((jsbytecode*) fragment->root->ip); trashSelf = true; return; } VMSideExit* exit = snapshot(UNSTABLE_LOOP_EXIT); JS_ASSERT(exit->numStackSlots == treeInfo->nStackTypes); VMFragment* root = (VMFragment*)fragment->root; peer_root = getLoop(traceMonitor, root->ip, root->globalObj, root->globalShape, root->argc); JS_ASSERT(peer_root != NULL); stable = deduceTypeStability(peer_root, &peer, demote); #if DEBUG if (!stable) AUDIT(unstableLoopVariable); #endif if (trashSelf) { debug_only_print0(LC_TMTracer, "Trashing tree from type instability.\n"); return; } if (stable && demote) { JS_ASSERT(fragment->kind == LoopTrace); return; } if (!stable) { fragment->lastIns = lir->insGuard(LIR_x, lir->insImm(1), createGuardRecord(exit)); /* * If we didn't find a type stable peer, we compile the loop anyway and * hope it becomes stable later. */ if (!peer) { /* * If such a fragment does not exist, let's compile the loop ahead * of time anyway. Later, if the loop becomes type stable, we will * connect these two fragments together. */ debug_only_print0(LC_TMTracer, "Trace has unstable loop variable with no stable peer, " "compiling anyway.\n"); UnstableExit* uexit = new UnstableExit; uexit->fragment = fragment; uexit->exit = exit; uexit->next = treeInfo->unstableExits; treeInfo->unstableExits = uexit; } else { JS_ASSERT(peer->code()); exit->target = peer; debug_only_printf(LC_TMTracer, "Joining type-unstable trace to target fragment %p.\n", (void*)peer); stable = true; ((TreeInfo*)peer->vmprivate)->dependentTrees.addUnique(fragment->root); treeInfo->linkedTrees.addUnique(peer); } } else { exit->target = fragment->root; fragment->lastIns = lir->insGuard(LIR_loop, lir->insImm(1), createGuardRecord(exit)); } compile(tm); if (fragmento->assm()->error() != nanojit::None) return; joinEdgesToEntry(fragmento, peer_root); debug_only_print0(LC_TMTracer, "updating specializations on dependent and linked trees\n"); if (fragment->root->vmprivate) specializeTreesToMissingGlobals(cx, globalObj, (TreeInfo*)fragment->root->vmprivate); /* * If this is a newly formed tree, and the outer tree has not been compiled yet, we * should try to compile the outer tree again. */ if (outer) js_AttemptCompilation(cx, tm, globalObj, outer, outerArgc); #ifdef JS_JIT_SPEW debug_only_printf(LC_TMMinimal, "recording completed at %s:%u@%u via closeLoop\n", cx->fp->script->filename, js_FramePCToLineNumber(cx, cx->fp), FramePCOffset(cx->fp)); debug_only_print0(LC_TMMinimal, "\n"); #endif } JS_REQUIRES_STACK void TraceRecorder::joinEdgesToEntry(Fragmento* fragmento, VMFragment* peer_root) { if (fragment->kind == LoopTrace) { TreeInfo* ti; Fragment* peer; JSTraceType* t1; JSTraceType* t2; UnstableExit* uexit, **unext; uint32* stackDemotes = (uint32*)alloca(sizeof(uint32) * treeInfo->nStackTypes); uint32* globalDemotes = (uint32*)alloca(sizeof(uint32) * treeInfo->nGlobalTypes()); for (peer = peer_root; peer != NULL; peer = peer->peer) { if (!peer->code()) continue; ti = (TreeInfo*)peer->vmprivate; uexit = ti->unstableExits; unext = &ti->unstableExits; while (uexit != NULL) { bool remove = js_JoinPeersIfCompatible(fragmento, fragment, treeInfo, uexit->exit); JS_ASSERT(!remove || fragment != peer); debug_only_stmt( if (remove) { debug_only_printf(LC_TMTracer, "Joining type-stable trace to target exit %p->%p.\n", (void*)uexit->fragment, (void*)uexit->exit); } ) if (!remove) { /* See if this exit contains mismatch demotions, which imply trashing a tree. This is actually faster than trashing the original tree as soon as the instability is detected, since we could have compiled a fairly stable tree that ran faster with integers. */ unsigned stackCount = 0; unsigned globalCount = 0; t1 = treeInfo->stackTypeMap(); t2 = getStackTypeMap(uexit->exit); for (unsigned i = 0; i < uexit->exit->numStackSlots; i++) { if (t2[i] == TT_INT32 && t1[i] == TT_DOUBLE) { stackDemotes[stackCount++] = i; } else if (t2[i] != t1[i]) { stackCount = 0; break; } } t1 = treeInfo->globalTypeMap(); t2 = getGlobalTypeMap(uexit->exit); for (unsigned i = 0; i < uexit->exit->numGlobalSlots; i++) { if (t2[i] == TT_INT32 && t1[i] == TT_DOUBLE) { globalDemotes[globalCount++] = i; } else if (t2[i] != t1[i]) { globalCount = 0; stackCount = 0; break; } } if (stackCount || globalCount) { for (unsigned i = 0; i < stackCount; i++) oracle.markStackSlotUndemotable(cx, stackDemotes[i]); for (unsigned i = 0; i < globalCount; i++) oracle.markGlobalSlotUndemotable(cx, ti->globalSlots->get(globalDemotes[i])); JS_ASSERT(peer == uexit->fragment->root); if (fragment == peer) trashSelf = true; else whichTreesToTrash.addUnique(uexit->fragment->root); break; } } if (remove) { *unext = uexit->next; delete uexit; uexit = *unext; } else { unext = &uexit->next; uexit = uexit->next; } } } } debug_only_stmt(js_DumpPeerStability(traceMonitor, peer_root->ip, peer_root->globalObj, peer_root->globalShape, peer_root->argc);) } /* Emit an always-exit guard and compile the tree (used for break statements. */ JS_REQUIRES_STACK void TraceRecorder::endLoop(JSTraceMonitor* tm) { if (callDepth != 0) { debug_only_print0(LC_TMTracer, "Blacklisted: stack depth mismatch, possible recursion.\n"); js_Blacklist((jsbytecode*) fragment->root->ip); trashSelf = true; return; } fragment->lastIns = lir->insGuard(LIR_x, lir->insImm(1), createGuardRecord(snapshot(LOOP_EXIT))); compile(tm); if (tm->fragmento->assm()->error() != nanojit::None) return; VMFragment* root = (VMFragment*)fragment->root; joinEdgesToEntry(tm->fragmento, getLoop(tm, root->ip, root->globalObj, root->globalShape, root->argc)); /* Note: this must always be done, in case we added new globals on trace and haven't yet propagated those to linked and dependent trees. */ debug_only_print0(LC_TMTracer, "updating specializations on dependent and linked trees\n"); if (fragment->root->vmprivate) specializeTreesToMissingGlobals(cx, globalObj, (TreeInfo*)fragment->root->vmprivate); /* * If this is a newly formed tree, and the outer tree has not been compiled yet, we * should try to compile the outer tree again. */ if (outer) js_AttemptCompilation(cx, tm, globalObj, outer, outerArgc); #ifdef JS_JIT_SPEW debug_only_printf(LC_TMMinimal, "Recording completed at %s:%u@%u via endLoop\n", cx->fp->script->filename, js_FramePCToLineNumber(cx, cx->fp), FramePCOffset(cx->fp)); debug_only_print0(LC_TMTracer, "\n"); #endif } /* Emit code to adjust the stack to match the inner tree's stack expectations. */ JS_REQUIRES_STACK void TraceRecorder::prepareTreeCall(Fragment* inner) { TreeInfo* ti = (TreeInfo*)inner->vmprivate; inner_sp_ins = lirbuf->sp; /* The inner tree expects to be called from the current frame. If the outer tree (this trace) is currently inside a function inlining code (calldepth > 0), we have to advance the native stack pointer such that we match what the inner trace expects to see. We move it back when we come out of the inner tree call. */ if (callDepth > 0) { /* Calculate the amount we have to lift the native stack pointer by to compensate for any outer frames that the inner tree doesn't expect but the outer tree has. */ ptrdiff_t sp_adj = nativeStackOffset(&cx->fp->argv[-2]); /* Calculate the amount we have to lift the call stack by */ ptrdiff_t rp_adj = callDepth * sizeof(FrameInfo*); /* Guard that we have enough stack space for the tree we are trying to call on top of the new value for sp. */ debug_only_printf(LC_TMTracer, "sp_adj=%d outer=%d inner=%d\n", sp_adj, treeInfo->nativeStackBase, ti->nativeStackBase); LIns* sp_top = lir->ins2i(LIR_piadd, lirbuf->sp, - treeInfo->nativeStackBase /* rebase sp to beginning of outer tree's stack */ + sp_adj /* adjust for stack in outer frame inner tree can't see */ + ti->maxNativeStackSlots * sizeof(double)); /* plus the inner tree's stack */ guard(true, lir->ins2(LIR_lt, sp_top, eos_ins), OOM_EXIT); /* Guard that we have enough call stack space. */ LIns* rp_top = lir->ins2i(LIR_piadd, lirbuf->rp, rp_adj + ti->maxCallDepth * sizeof(FrameInfo*)); guard(true, lir->ins2(LIR_lt, rp_top, eor_ins), OOM_EXIT); /* We have enough space, so adjust sp and rp to their new level. */ lir->insStorei(inner_sp_ins = lir->ins2i(LIR_piadd, lirbuf->sp, - treeInfo->nativeStackBase /* rebase sp to beginning of outer tree's stack */ + sp_adj /* adjust for stack in outer frame inner tree can't see */ + ti->nativeStackBase), /* plus the inner tree's stack base */ lirbuf->state, offsetof(InterpState, sp)); lir->insStorei(lir->ins2i(LIR_piadd, lirbuf->rp, rp_adj), lirbuf->state, offsetof(InterpState, rp)); } } /* Record a call to an inner tree. */ JS_REQUIRES_STACK void TraceRecorder::emitTreeCall(Fragment* inner, VMSideExit* exit) { TreeInfo* ti = (TreeInfo*)inner->vmprivate; /* Invoke the inner tree. */ LIns* args[] = { INS_CONSTPTR(inner), lirbuf->state }; /* reverse order */ LIns* ret = lir->insCall(&js_CallTree_ci, args); /* Read back all registers, in case the called tree changed any of them. */ #ifdef DEBUG JSTraceType* map; size_t i; map = getGlobalTypeMap(exit); for (i = 0; i < exit->numGlobalSlots; i++) JS_ASSERT(map[i] != TT_JSVAL); map = getStackTypeMap(exit); for (i = 0; i < exit->numStackSlots; i++) JS_ASSERT(map[i] != TT_JSVAL); #endif import(ti, inner_sp_ins, exit->numStackSlots, exit->numGlobalSlots, exit->calldepth, getFullTypeMap(exit)); /* Restore sp and rp to their original values (we still have them in a register). */ if (callDepth > 0) { lir->insStorei(lirbuf->sp, lirbuf->state, offsetof(InterpState, sp)); lir->insStorei(lirbuf->rp, lirbuf->state, offsetof(InterpState, rp)); } /* * Guard that we come out of the inner tree along the same side exit we came out when * we called the inner tree at recording time. */ guard(true, lir->ins2(LIR_eq, ret, INS_CONSTPTR(exit)), NESTED_EXIT); /* Register us as a dependent tree of the inner tree. */ ((TreeInfo*)inner->vmprivate)->dependentTrees.addUnique(fragment->root); treeInfo->linkedTrees.addUnique(inner); } /* Add a if/if-else control-flow merge point to the list of known merge points. */ JS_REQUIRES_STACK void TraceRecorder::trackCfgMerges(jsbytecode* pc) { /* If we hit the beginning of an if/if-else, then keep track of the merge point after it. */ JS_ASSERT((*pc == JSOP_IFEQ) || (*pc == JSOP_IFEQX)); jssrcnote* sn = js_GetSrcNote(cx->fp->script, pc); if (sn != NULL) { if (SN_TYPE(sn) == SRC_IF) { cfgMerges.add((*pc == JSOP_IFEQ) ? pc + GET_JUMP_OFFSET(pc) : pc + GET_JUMPX_OFFSET(pc)); } else if (SN_TYPE(sn) == SRC_IF_ELSE) cfgMerges.add(pc + js_GetSrcNoteOffset(sn, 0)); } } /* Invert the direction of the guard if this is a loop edge that is not taken (thin loop). */ JS_REQUIRES_STACK void TraceRecorder::emitIf(jsbytecode* pc, bool cond, LIns* x) { ExitType exitType; if (js_IsLoopEdge(pc, (jsbytecode*)fragment->root->ip)) { exitType = LOOP_EXIT; /* * If we are about to walk out of the loop, generate code for the inverse loop * condition, pretending we recorded the case that stays on trace. */ if ((*pc == JSOP_IFEQ || *pc == JSOP_IFEQX) == cond) { JS_ASSERT(*pc == JSOP_IFNE || *pc == JSOP_IFNEX || *pc == JSOP_IFEQ || *pc == JSOP_IFEQX); debug_only_print0(LC_TMTracer, "Walking out of the loop, terminating it anyway.\n"); cond = !cond; } /* * Conditional guards do not have to be emitted if the condition is constant. We * make a note whether the loop condition is true or false here, so we later know * whether to emit a loop edge or a loop end. */ if (x->isconst()) { loop = (x->imm32() == cond); return; } } else { exitType = BRANCH_EXIT; } if (!x->isconst()) guard(cond, x, exitType); } /* Emit code for a fused IFEQ/IFNE. */ JS_REQUIRES_STACK void TraceRecorder::fuseIf(jsbytecode* pc, bool cond, LIns* x) { if (*pc == JSOP_IFEQ || *pc == JSOP_IFNE) { emitIf(pc, cond, x); if (*pc == JSOP_IFEQ) trackCfgMerges(pc); } } /* Check whether we have reached the end of the trace. */ JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::checkTraceEnd(jsbytecode *pc) { if (js_IsLoopEdge(pc, (jsbytecode*)fragment->root->ip)) { /* * If we compile a loop, the trace should have a zero stack balance at the loop * edge. Currently we are parked on a comparison op or IFNE/IFEQ, so advance * pc to the loop header and adjust the stack pointer and pretend we have * reached the loop header. */ if (loop) { JS_ASSERT(!cx->fp->imacpc && (pc == cx->fp->regs->pc || pc == cx->fp->regs->pc + 1)); bool fused = pc != cx->fp->regs->pc; JSFrameRegs orig = *cx->fp->regs; cx->fp->regs->pc = (jsbytecode*)fragment->root->ip; cx->fp->regs->sp -= fused ? 2 : 1; bool demote = false; closeLoop(traceMonitor, demote); *cx->fp->regs = orig; /* * If compiling this loop generated new oracle information which will likely * lead to a different compilation result, immediately trigger another * compiler run. This is guaranteed to converge since the oracle only * accumulates adverse information but never drops it (except when we * flush it during garbage collection.) */ if (demote) js_AttemptCompilation(cx, traceMonitor, globalObj, outer, outerArgc); } else { endLoop(traceMonitor); } return JSRS_STOP; } return JSRS_CONTINUE; } bool TraceRecorder::hasMethod(JSObject* obj, jsid id) { if (!obj) return false; JSObject* pobj; JSProperty* prop; int protoIndex = OBJ_LOOKUP_PROPERTY(cx, obj, id, &pobj, &prop); if (protoIndex < 0 || !prop) return false; bool found = false; if (OBJ_IS_NATIVE(pobj)) { JSScope* scope = OBJ_SCOPE(pobj); JSScopeProperty* sprop = (JSScopeProperty*) prop; if (SPROP_HAS_STUB_GETTER(sprop) && SPROP_HAS_VALID_SLOT(sprop, scope)) { jsval v = LOCKED_OBJ_GET_SLOT(pobj, sprop->slot); if (VALUE_IS_FUNCTION(cx, v)) { found = true; if (!SCOPE_IS_BRANDED(scope)) { js_MakeScopeShapeUnique(cx, scope); SCOPE_SET_BRANDED(scope); } } } } OBJ_DROP_PROPERTY(cx, pobj, prop); return found; } JS_REQUIRES_STACK bool TraceRecorder::hasIteratorMethod(JSObject* obj) { JS_ASSERT(cx->fp->regs->sp + 2 <= cx->fp->slots + cx->fp->script->nslots); return hasMethod(obj, ATOM_TO_JSID(cx->runtime->atomState.iteratorAtom)); } int nanojit::StackFilter::getTop(LInsp guard) { VMSideExit* e = (VMSideExit*)guard->record()->exit; if (sp == lirbuf->sp) return e->sp_adj; JS_ASSERT(sp == lirbuf->rp); return e->rp_adj; } #if defined NJ_VERBOSE void nanojit::LirNameMap::formatGuard(LIns *i, char *out) { VMSideExit *x; x = (VMSideExit *)i->record()->exit; sprintf(out, "%s: %s %s -> pc=%p imacpc=%p sp%+ld rp%+ld", formatRef(i), lirNames[i->opcode()], i->oprnd1()->isCond() ? formatRef(i->oprnd1()) : "", (void *)x->pc, (void *)x->imacpc, (long int)x->sp_adj, (long int)x->rp_adj); } #endif void nanojit::Fragment::onDestroy() { delete (TreeInfo *)vmprivate; } static JS_REQUIRES_STACK bool js_DeleteRecorder(JSContext* cx) { JSTraceMonitor* tm = &JS_TRACE_MONITOR(cx); /* Aborting and completing a trace end up here. */ delete tm->recorder; tm->recorder = NULL; /* * If we ran out of memory, flush the code cache. */ if (JS_TRACE_MONITOR(cx).fragmento->assm()->error() == OutOMem || js_OverfullFragmento(tm, tm->fragmento)) { FlushJITCache(cx); return false; } return true; } /** * Checks whether the shape of the global object has changed. */ static JS_REQUIRES_STACK bool CheckGlobalObjectShape(JSContext* cx, JSTraceMonitor* tm, JSObject* globalObj, uint32 *shape=NULL, SlotList** slots=NULL) { if (tm->needFlush) { FlushJITCache(cx); return false; } if (STOBJ_NSLOTS(globalObj) > MAX_GLOBAL_SLOTS) return false; uint32 globalShape = OBJ_SHAPE(globalObj); if (tm->recorder) { VMFragment* root = (VMFragment*)tm->recorder->getFragment()->root; TreeInfo* ti = tm->recorder->getTreeInfo(); /* Check the global shape matches the recorder's treeinfo's shape. */ if (globalObj != root->globalObj || globalShape != root->globalShape) { AUDIT(globalShapeMismatchAtEntry); debug_only_printf(LC_TMTracer, "Global object/shape mismatch (%p/%u vs. %p/%u), flushing cache.\n", (void*)globalObj, globalShape, (void*)root->globalObj, root->globalShape); js_Backoff(cx, (jsbytecode*) root->ip); FlushJITCache(cx); return false; } if (shape) *shape = globalShape; if (slots) *slots = ti->globalSlots; return true; } /* No recorder, search for a tracked global-state (or allocate one). */ for (size_t i = 0; i < MONITOR_N_GLOBAL_STATES; ++i) { GlobalState &state = tm->globalStates[i]; if (state.globalShape == uint32(-1)) { state.globalObj = globalObj; state.globalShape = globalShape; JS_ASSERT(state.globalSlots); JS_ASSERT(state.globalSlots->length() == 0); } if (state.globalObj == globalObj && state.globalShape == globalShape) { if (shape) *shape = globalShape; if (slots) *slots = state.globalSlots; return true; } } /* No currently-tracked-global found and no room to allocate, abort. */ AUDIT(globalShapeMismatchAtEntry); debug_only_printf(LC_TMTracer, "No global slotlist for global shape %u, flushing cache.\n", globalShape); FlushJITCache(cx); return false; } static JS_REQUIRES_STACK bool js_StartRecorder(JSContext* cx, VMSideExit* anchor, Fragment* f, TreeInfo* ti, unsigned stackSlots, unsigned ngslots, JSTraceType* typeMap, VMSideExit* expectedInnerExit, jsbytecode* outer, uint32 outerArgc) { JSTraceMonitor* tm = &JS_TRACE_MONITOR(cx); if (JS_TRACE_MONITOR(cx).needFlush) { FlushJITCache(cx); return false; } JS_ASSERT(f->root != f || !cx->fp->imacpc); /* start recording if no exception during construction */ tm->recorder = new (&gc) TraceRecorder(cx, anchor, f, ti, stackSlots, ngslots, typeMap, expectedInnerExit, outer, outerArgc); if (cx->throwing) { js_AbortRecording(cx, "setting up recorder failed"); return false; } /* clear any leftover error state */ tm->fragmento->assm()->setError(None); return true; } static void js_TrashTree(JSContext* cx, Fragment* f) { JS_ASSERT((!f->code()) == (!f->vmprivate)); JS_ASSERT(f == f->root); if (!f->code()) return; AUDIT(treesTrashed); debug_only_print0(LC_TMTracer, "Trashing tree info.\n"); Fragmento* fragmento = JS_TRACE_MONITOR(cx).fragmento; TreeInfo* ti = (TreeInfo*)f->vmprivate; f->vmprivate = NULL; f->releaseCode(fragmento); Fragment** data = ti->dependentTrees.data(); unsigned length = ti->dependentTrees.length(); for (unsigned n = 0; n < length; ++n) js_TrashTree(cx, data[n]); delete ti; JS_ASSERT(!f->code() && !f->vmprivate); } static int js_SynthesizeFrame(JSContext* cx, const FrameInfo& fi) { VOUCH_DOES_NOT_REQUIRE_STACK(); JS_ASSERT(HAS_FUNCTION_CLASS(fi.callee)); JSFunction* fun = GET_FUNCTION_PRIVATE(cx, fi.callee); JS_ASSERT(FUN_INTERPRETED(fun)); /* Assert that we have a correct sp distance from cx->fp->slots in fi. */ JSStackFrame* fp = cx->fp; JS_ASSERT_IF(!fi.imacpc, js_ReconstructStackDepth(cx, fp->script, fi.pc) == uintN(fi.spdist - fp->script->nfixed)); uintN nframeslots = JS_HOWMANY(sizeof(JSInlineFrame), sizeof(jsval)); JSScript* script = fun->u.i.script; size_t nbytes = (nframeslots + script->nslots) * sizeof(jsval); /* Code duplicated from inline_call: case in js_Interpret (FIXME). */ JSArena* a = cx->stackPool.current; void* newmark = (void*) a->avail; uintN argc = fi.get_argc(); jsval* vp = fp->slots + fi.spdist - (2 + argc); uintN missing = 0; jsval* newsp; if (fun->nargs > argc) { const JSFrameRegs& regs = *fp->regs; newsp = vp + 2 + fun->nargs; JS_ASSERT(newsp > regs.sp); if ((jsuword) newsp <= a->limit) { if ((jsuword) newsp > a->avail) a->avail = (jsuword) newsp; jsval* argsp = newsp; do { *--argsp = JSVAL_VOID; } while (argsp != regs.sp); missing = 0; } else { missing = fun->nargs - argc; nbytes += (2 + fun->nargs) * sizeof(jsval); } } /* Allocate the inline frame with its vars and operands. */ if (a->avail + nbytes <= a->limit) { newsp = (jsval *) a->avail; a->avail += nbytes; JS_ASSERT(missing == 0); } else { /* This allocation is infallible: js_ExecuteTree reserved enough stack. */ JS_ARENA_ALLOCATE_CAST(newsp, jsval *, &cx->stackPool, nbytes); JS_ASSERT(newsp); /* * Move args if the missing ones overflow arena a, then push * undefined for the missing args. */ if (missing) { memcpy(newsp, vp, (2 + argc) * sizeof(jsval)); vp = newsp; newsp = vp + 2 + argc; do { *newsp++ = JSVAL_VOID; } while (--missing != 0); } } /* Claim space for the stack frame and initialize it. */ JSInlineFrame* newifp = (JSInlineFrame *) newsp; newsp += nframeslots; newifp->frame.callobj = NULL; newifp->frame.argsobj = NULL; newifp->frame.varobj = NULL; newifp->frame.script = script; newifp->frame.callee = fi.callee; // Roll with a potentially stale callee for now. newifp->frame.fun = fun; bool constructing = fi.is_constructing(); newifp->frame.argc = argc; newifp->callerRegs.pc = fi.pc; newifp->callerRegs.sp = fp->slots + fi.spdist; fp->imacpc = fi.imacpc; #ifdef DEBUG if (fi.block != fp->blockChain) { for (JSObject* obj = fi.block; obj != fp->blockChain; obj = STOBJ_GET_PARENT(obj)) JS_ASSERT(obj); } #endif fp->blockChain = fi.block; newifp->frame.argv = newifp->callerRegs.sp - argc; JS_ASSERT(newifp->frame.argv); #ifdef DEBUG // Initialize argv[-1] to a known-bogus value so we'll catch it if // someone forgets to initialize it later. newifp->frame.argv[-1] = JSVAL_HOLE; #endif JS_ASSERT(newifp->frame.argv >= StackBase(fp) + 2); newifp->frame.rval = JSVAL_VOID; newifp->frame.down = fp; newifp->frame.annotation = NULL; newifp->frame.scopeChain = NULL; // will be updated in FlushNativeStackFrame newifp->frame.sharpDepth = 0; newifp->frame.sharpArray = NULL; newifp->frame.flags = constructing ? JSFRAME_CONSTRUCTING : 0; newifp->frame.dormantNext = NULL; newifp->frame.xmlNamespace = NULL; newifp->frame.blockChain = NULL; newifp->mark = newmark; newifp->frame.thisp = NULL; // will be updated in FlushNativeStackFrame newifp->frame.regs = fp->regs; newifp->frame.regs->pc = script->code; newifp->frame.regs->sp = newsp + script->nfixed; newifp->frame.imacpc = NULL; newifp->frame.slots = newsp; if (script->staticLevel < JS_DISPLAY_SIZE) { JSStackFrame **disp = &cx->display[script->staticLevel]; newifp->frame.displaySave = *disp; *disp = &newifp->frame; } /* * Note that fp->script is still the caller's script; set the callee * inline frame's idea of caller version from its version. */ newifp->callerVersion = (JSVersion) fp->script->version; // After this paragraph, fp and cx->fp point to the newly synthesized frame. fp->regs = &newifp->callerRegs; fp = cx->fp = &newifp->frame; /* * If there's a call hook, invoke it to compute the hookData used by * debuggers that cooperate with the interpreter. */ JSInterpreterHook hook = cx->debugHooks->callHook; if (hook) { newifp->hookData = hook(cx, fp, JS_TRUE, 0, cx->debugHooks->callHookData); } else { newifp->hookData = NULL; } // FIXME? we must count stack slots from caller's operand stack up to (but not including) // callee's, including missing arguments. Could we shift everything down to the caller's // fp->slots (where vars start) and avoid some of the complexity? return (fi.spdist - fp->down->script->nfixed) + ((fun->nargs > fp->argc) ? fun->nargs - fp->argc : 0) + script->nfixed; } static void SynthesizeSlowNativeFrame(JSContext *cx, VMSideExit *exit) { VOUCH_DOES_NOT_REQUIRE_STACK(); void *mark; JSInlineFrame *ifp; /* This allocation is infallible: js_ExecuteTree reserved enough stack. */ mark = JS_ARENA_MARK(&cx->stackPool); JS_ARENA_ALLOCATE_CAST(ifp, JSInlineFrame *, &cx->stackPool, sizeof(JSInlineFrame)); JS_ASSERT(ifp); JSStackFrame *fp = &ifp->frame; fp->regs = NULL; fp->imacpc = NULL; fp->slots = NULL; fp->callobj = NULL; fp->argsobj = NULL; fp->varobj = cx->fp->varobj; fp->callee = exit->nativeCallee(); fp->script = NULL; fp->fun = GET_FUNCTION_PRIVATE(cx, fp->callee); // fp->thisp is really a jsval, so reinterpret_cast here, not JSVAL_TO_OBJECT. fp->thisp = (JSObject *) cx->nativeVp[1]; fp->argc = cx->nativeVpLen - 2; fp->argv = cx->nativeVp + 2; fp->rval = JSVAL_VOID; fp->down = cx->fp; fp->annotation = NULL; JS_ASSERT(cx->fp->scopeChain); fp->scopeChain = cx->fp->scopeChain; fp->blockChain = NULL; fp->sharpDepth = 0; fp->sharpArray = NULL; fp->flags = exit->constructing() ? JSFRAME_CONSTRUCTING : 0; fp->dormantNext = NULL; fp->xmlNamespace = NULL; fp->displaySave = NULL; ifp->mark = mark; cx->fp = fp; } JS_REQUIRES_STACK bool js_RecordTree(JSContext* cx, JSTraceMonitor* tm, Fragment* f, jsbytecode* outer, uint32 outerArgc, JSObject* globalObj, uint32 globalShape, SlotList* globalSlots, uint32 argc) { JS_ASSERT(f->root == f); /* Make sure the global type map didn't change on us. */ if (!CheckGlobalObjectShape(cx, tm, globalObj)) { js_Backoff(cx, (jsbytecode*) f->root->ip); return false; } AUDIT(recorderStarted); /* Try to find an unused peer fragment, or allocate a new one. */ while (f->code() && f->peer) f = f->peer; if (f->code()) f = getAnchor(&JS_TRACE_MONITOR(cx), f->root->ip, globalObj, globalShape, argc); if (!f) { FlushJITCache(cx); return false; } f->root = f; f->lirbuf = tm->lirbuf; if (f->lirbuf->outOMem() || js_OverfullFragmento(tm, tm->fragmento)) { js_Backoff(cx, (jsbytecode*) f->root->ip); FlushJITCache(cx); debug_only_print0(LC_TMTracer, "Out of memory recording new tree, flushing cache.\n"); return false; } JS_ASSERT(!f->code() && !f->vmprivate); /* setup the VM-private treeInfo structure for this fragment */ TreeInfo* ti = new (&gc) TreeInfo(f, globalSlots); /* capture the coerced type of each active slot in the type map */ ti->typeMap.captureTypes(cx, globalObj, *globalSlots, 0/*callDepth*/); ti->nStackTypes = ti->typeMap.length() - globalSlots->length(); #ifdef DEBUG ensureTreeIsUnique(tm, (VMFragment*)f, ti); ti->treeFileName = cx->fp->script->filename; ti->treeLineNumber = js_FramePCToLineNumber(cx, cx->fp); ti->treePCOffset = FramePCOffset(cx->fp); #endif /* determine the native frame layout at the entry point */ unsigned entryNativeStackSlots = ti->nStackTypes; JS_ASSERT(entryNativeStackSlots == js_NativeStackSlots(cx, 0/*callDepth*/)); ti->nativeStackBase = (entryNativeStackSlots - (cx->fp->regs->sp - StackBase(cx->fp))) * sizeof(double); ti->maxNativeStackSlots = entryNativeStackSlots; ti->maxCallDepth = 0; ti->script = cx->fp->script; /* recording primary trace */ if (!js_StartRecorder(cx, NULL, f, ti, ti->nStackTypes, ti->globalSlots->length(), ti->typeMap.data(), NULL, outer, outerArgc)) { return false; } return true; } JS_REQUIRES_STACK static inline void markSlotUndemotable(JSContext* cx, TreeInfo* ti, unsigned slot) { if (slot < ti->nStackTypes) { oracle.markStackSlotUndemotable(cx, slot); return; } uint16* gslots = ti->globalSlots->data(); oracle.markGlobalSlotUndemotable(cx, gslots[slot - ti->nStackTypes]); } JS_REQUIRES_STACK static inline bool isSlotUndemotable(JSContext* cx, TreeInfo* ti, unsigned slot) { if (slot < ti->nStackTypes) return oracle.isStackSlotUndemotable(cx, slot); uint16* gslots = ti->globalSlots->data(); return oracle.isGlobalSlotUndemotable(cx, gslots[slot - ti->nStackTypes]); } JS_REQUIRES_STACK static bool js_AttemptToStabilizeTree(JSContext* cx, JSObject* globalObj, VMSideExit* exit, jsbytecode* outer, uint32 outerArgc) { JSTraceMonitor* tm = &JS_TRACE_MONITOR(cx); if (tm->needFlush) { FlushJITCache(cx); return false; } VMFragment* from = (VMFragment*)exit->from->root; TreeInfo* from_ti = (TreeInfo*)from->vmprivate; JS_ASSERT(exit->from->root->code()); /* * The loop edge exit might not know about all types since the tree could have * been further specialized since it was recorded. Fill in the missing types * from the entry type map. */ JSTraceType* m = getFullTypeMap(exit); unsigned ngslots = exit->numGlobalSlots; if (ngslots < from_ti->nGlobalTypes()) { uint32 partial = exit->numStackSlots + exit->numGlobalSlots; m = (JSTraceType*)alloca(from_ti->typeMap.length() * sizeof(JSTraceType)); memcpy(m, getFullTypeMap(exit), partial); memcpy(m + partial, from_ti->globalTypeMap() + exit->numGlobalSlots, from_ti->nGlobalTypes() - exit->numGlobalSlots); ngslots = from_ti->nGlobalTypes(); } JS_ASSERT(exit->numStackSlots + ngslots == from_ti->typeMap.length()); /* * If we see any doubles along the loop edge, mark those slots undemotable * since we know now for a fact that they can contain doubles. */ for (unsigned i = 0; i < from_ti->typeMap.length(); i++) { if (m[i] == TT_DOUBLE) markSlotUndemotable(cx, from_ti, i); } bool bound = false; for (Fragment* f = from->first; f != NULL; f = f->peer) { if (!f->code()) continue; TreeInfo* ti = (TreeInfo*)f->vmprivate; JS_ASSERT(exit->numStackSlots == ti->nStackTypes); /* Check the minimum number of slots that need to be compared. */ unsigned checkSlots = JS_MIN(from_ti->typeMap.length(), ti->typeMap.length()); JSTraceType* m2 = ti->typeMap.data(); /* Analyze the exit typemap against the peer typemap. * Two conditions are important: * 1) Typemaps are identical: these peers can be attached. * 2) Typemaps do not match, but only contain I->D mismatches. * In this case, the original tree must be trashed because it * will never connect to any peer. */ bool matched = true; bool undemote = false; for (uint32 i = 0; i < checkSlots; i++) { /* If the types are equal we're okay. */ if (m[i] == m2[i]) continue; matched = false; /* If there's an I->D that cannot be resolved, flag it. * Otherwise, break and go to the next peer. */ if (m[i] == TT_INT32 && m2[i] == TT_DOUBLE && isSlotUndemotable(cx, ti, i)) { undemote = true; } else { undemote = false; break; } } if (matched) { JS_ASSERT(from_ti->globalSlots == ti->globalSlots); JS_ASSERT(from_ti->nStackTypes == ti->nStackTypes); /* Capture missing globals on both trees and link the fragments together. */ if (from != f) { ti->dependentTrees.addUnique(from); from_ti->linkedTrees.addUnique(f); } if (ti->nGlobalTypes() < ti->globalSlots->length()) specializeTreesToMissingGlobals(cx, globalObj, ti); exit->target = f; tm->fragmento->assm()->patch(exit); /* Now erase this exit from the unstable exit list. */ UnstableExit** tail = &from_ti->unstableExits; for (UnstableExit* uexit = from_ti->unstableExits; uexit != NULL; uexit = uexit->next) { if (uexit->exit == exit) { *tail = uexit->next; delete uexit; bound = true; break; } tail = &uexit->next; } JS_ASSERT(bound); debug_only_stmt( js_DumpPeerStability(tm, f->ip, from->globalObj, from->globalShape, from->argc); ) break; } else if (undemote) { /* The original tree is unconnectable, so trash it. */ js_TrashTree(cx, f); /* We shouldn't attempt to record now, since we'll hit a duplicate. */ return false; } } if (bound) return false; VMFragment* root = (VMFragment*)from->root; return js_RecordTree(cx, tm, from->first, outer, outerArgc, root->globalObj, root->globalShape, from_ti->globalSlots, cx->fp->argc); } static JS_REQUIRES_STACK bool js_AttemptToExtendTree(JSContext* cx, VMSideExit* anchor, VMSideExit* exitedFrom, jsbytecode* outer #ifdef MOZ_TRACEVIS , TraceVisStateObj* tvso = NULL #endif ) { JSTraceMonitor* tm = &JS_TRACE_MONITOR(cx); if (tm->needFlush) { FlushJITCache(cx); #ifdef MOZ_TRACEVIS if (tvso) tvso->r = R_FAIL_EXTEND_FLUSH; #endif return false; } Fragment* f = anchor->from->root; JS_ASSERT(f->vmprivate); TreeInfo* ti = (TreeInfo*)f->vmprivate; /* Don't grow trees above a certain size to avoid code explosion due to tail duplication. */ if (ti->branchCount >= MAX_BRANCHES) { #ifdef MOZ_TRACEVIS if (tvso) tvso->r = R_FAIL_EXTEND_MAX_BRANCHES; #endif return false; } Fragment* c; if (!(c = anchor->target)) { c = JS_TRACE_MONITOR(cx).fragmento->createBranch(anchor, cx->fp->regs->pc); c->spawnedFrom = anchor; c->parent = f; anchor->target = c; c->root = f; } /* * If we are recycling a fragment, it might have a different ip so reset it here. This * can happen when attaching a branch to a NESTED_EXIT, which might extend along separate paths * (i.e. after the loop edge, and after a return statement). */ c->ip = cx->fp->regs->pc; debug_only_printf(LC_TMTracer, "trying to attach another branch to the tree (hits = %d)\n", c->hits()); int32_t& hits = c->hits(); if (outer || (hits++ >= HOTEXIT && hits <= HOTEXIT+MAXEXIT)) { /* start tracing secondary trace from this point */ c->lirbuf = f->lirbuf; unsigned stackSlots; unsigned ngslots; JSTraceType* typeMap; TypeMap fullMap; if (exitedFrom == NULL) { /* If we are coming straight from a simple side exit, just use that exit's type map as starting point. */ ngslots = anchor->numGlobalSlots; stackSlots = anchor->numStackSlots; typeMap = getFullTypeMap(anchor); } else { /* If we side-exited on a loop exit and continue on a nesting guard, the nesting guard (anchor) has the type information for everything below the current scope, and the actual guard we exited from has the types for everything in the current scope (and whatever it inlined). We have to merge those maps here. */ VMSideExit* e1 = anchor; VMSideExit* e2 = exitedFrom; fullMap.add(getStackTypeMap(e1), e1->numStackSlotsBelowCurrentFrame); fullMap.add(getStackTypeMap(e2), e2->numStackSlots); stackSlots = fullMap.length(); fullMap.add(getGlobalTypeMap(e2), e2->numGlobalSlots); if (e1->numGlobalSlots >= e2->numGlobalSlots) { fullMap.add(getGlobalTypeMap(e1) + e2->numGlobalSlots, e1->numGlobalSlots - e2->numGlobalSlots); } ngslots = e1->numGlobalSlots; typeMap = fullMap.data(); } JS_ASSERT(ngslots >= anchor->numGlobalSlots); bool rv = js_StartRecorder(cx, anchor, c, (TreeInfo*)f->vmprivate, stackSlots, ngslots, typeMap, exitedFrom, outer, cx->fp->argc); #ifdef MOZ_TRACEVIS if (!rv && tvso) tvso->r = R_FAIL_EXTEND_START; #endif return rv; } #ifdef MOZ_TRACEVIS if (tvso) tvso->r = R_FAIL_EXTEND_COLD; #endif return false; } static JS_REQUIRES_STACK VMSideExit* js_ExecuteTree(JSContext* cx, Fragment* f, uintN& inlineCallCount, VMSideExit** innermostNestedGuardp); JS_REQUIRES_STACK bool js_RecordLoopEdge(JSContext* cx, TraceRecorder* r, uintN& inlineCallCount) { #ifdef JS_THREADSAFE if (OBJ_SCOPE(JS_GetGlobalForObject(cx, cx->fp->scopeChain))->title.ownercx != cx) { js_AbortRecording(cx, "Global object not owned by this context"); return false; /* we stay away from shared global objects */ } #endif JSTraceMonitor* tm = &JS_TRACE_MONITOR(cx); /* Process needFlush and deep abort requests. */ if (tm->needFlush) { FlushJITCache(cx); return false; } if (r->wasDeepAborted()) { js_AbortRecording(cx, "deep abort requested"); return false; } JS_ASSERT(r->getFragment() && !r->getFragment()->lastIns); VMFragment* root = (VMFragment*)r->getFragment()->root; /* Does this branch go to an inner loop? */ Fragment* first = getLoop(&JS_TRACE_MONITOR(cx), cx->fp->regs->pc, root->globalObj, root->globalShape, cx->fp->argc); if (!first) { /* Not an inner loop we can call, abort trace. */ AUDIT(returnToDifferentLoopHeader); JS_ASSERT(!cx->fp->imacpc); debug_only_printf(LC_TMTracer, "loop edge to %d, header %d\n", cx->fp->regs->pc - cx->fp->script->code, (jsbytecode*)r->getFragment()->root->ip - cx->fp->script->code); js_AbortRecording(cx, "Loop edge does not return to header"); return false; } /* Make sure inner tree call will not run into an out-of-memory condition. */ if (tm->reservedDoublePoolPtr < (tm->reservedDoublePool + MAX_NATIVE_STACK_SLOTS) && !js_ReplenishReservedPool(cx, tm)) { js_AbortRecording(cx, "Couldn't call inner tree (out of memory)"); return false; } /* Make sure the shape of the global object still matches (this might flush the JIT cache). */ JSObject* globalObj = JS_GetGlobalForObject(cx, cx->fp->scopeChain); uint32 globalShape = -1; SlotList* globalSlots = NULL; if (!CheckGlobalObjectShape(cx, tm, globalObj, &globalShape, &globalSlots)) return false; debug_only_printf(LC_TMTracer, "Looking for type-compatible peer (%s:%d@%d)\n", cx->fp->script->filename, js_FramePCToLineNumber(cx, cx->fp), FramePCOffset(cx->fp)); // Find a matching inner tree. If none can be found, compile one. Fragment* f = r->findNestedCompatiblePeer(first); if (!f || !f->code()) { AUDIT(noCompatInnerTrees); VMFragment* outerFragment = (VMFragment*) tm->recorder->getFragment()->root; jsbytecode* outer = (jsbytecode*) outerFragment->ip; uint32 outerArgc = outerFragment->argc; uint32 argc = cx->fp->argc; js_AbortRecording(cx, "No compatible inner tree"); // Find an empty fragment we can recycle, or allocate a new one. for (f = first; f != NULL; f = f->peer) { if (!f->code()) break; } if (!f || f->code()) { f = getAnchor(tm, cx->fp->regs->pc, globalObj, globalShape, argc); if (!f) { FlushJITCache(cx); return false; } } return js_RecordTree(cx, tm, f, outer, outerArgc, globalObj, globalShape, globalSlots, argc); } r->adjustCallerTypes(f); r->prepareTreeCall(f); VMSideExit* innermostNestedGuard = NULL; VMSideExit* lr = js_ExecuteTree(cx, f, inlineCallCount, &innermostNestedGuard); if (!lr || r->wasDeepAborted()) { if (!lr) js_AbortRecording(cx, "Couldn't call inner tree"); return false; } VMFragment* outerFragment = (VMFragment*) tm->recorder->getFragment()->root; jsbytecode* outer = (jsbytecode*) outerFragment->ip; switch (lr->exitType) { case LOOP_EXIT: /* If the inner tree exited on an unknown loop exit, grow the tree around it. */ if (innermostNestedGuard) { js_AbortRecording(cx, "Inner tree took different side exit, abort current " "recording and grow nesting tree"); return js_AttemptToExtendTree(cx, innermostNestedGuard, lr, outer); } /* emit a call to the inner tree and continue recording the outer tree trace */ r->emitTreeCall(f, lr); return true; case UNSTABLE_LOOP_EXIT: /* abort recording so the inner loop can become type stable. */ js_AbortRecording(cx, "Inner tree is trying to stabilize, abort outer recording"); return js_AttemptToStabilizeTree(cx, globalObj, lr, outer, outerFragment->argc); case OVERFLOW_EXIT: oracle.markInstructionUndemotable(cx->fp->regs->pc); /* fall through */ case BRANCH_EXIT: case CASE_EXIT: /* abort recording the outer tree, extend the inner tree */ js_AbortRecording(cx, "Inner tree is trying to grow, abort outer recording"); return js_AttemptToExtendTree(cx, lr, NULL, outer); default: debug_only_printf(LC_TMTracer, "exit_type=%s\n", getExitName(lr->exitType)); js_AbortRecording(cx, "Inner tree not suitable for calling"); return false; } } static bool js_IsEntryTypeCompatible(jsval* vp, JSTraceType* m) { unsigned tag = JSVAL_TAG(*vp); debug_only_printf(LC_TMTracer, "%c/%c ", tagChar[tag], typeChar[*m]); switch (*m) { case TT_OBJECT: if (tag == JSVAL_OBJECT && !JSVAL_IS_NULL(*vp) && !HAS_FUNCTION_CLASS(JSVAL_TO_OBJECT(*vp))) { return true; } debug_only_printf(LC_TMTracer, "object != tag%u ", tag); return false; case TT_INT32: jsint i; if (JSVAL_IS_INT(*vp)) return true; if (tag == JSVAL_DOUBLE && JSDOUBLE_IS_INT(*JSVAL_TO_DOUBLE(*vp), i)) return true; debug_only_printf(LC_TMTracer, "int != tag%u(value=%lu) ", tag, (unsigned long)*vp); return false; case TT_DOUBLE: if (JSVAL_IS_INT(*vp) || tag == JSVAL_DOUBLE) return true; debug_only_printf(LC_TMTracer, "double != tag%u ", tag); return false; case TT_JSVAL: JS_NOT_REACHED("shouldn't see jsval type in entry"); return false; case TT_STRING: if (tag == JSVAL_STRING) return true; debug_only_printf(LC_TMTracer, "string != tag%u ", tag); return false; case TT_NULL: if (JSVAL_IS_NULL(*vp)) return true; debug_only_printf(LC_TMTracer, "null != tag%u ", tag); return false; case TT_PSEUDOBOOLEAN: if (tag == JSVAL_BOOLEAN) return true; debug_only_printf(LC_TMTracer, "bool != tag%u ", tag); return false; default: JS_ASSERT(*m == TT_FUNCTION); if (tag == JSVAL_OBJECT && !JSVAL_IS_NULL(*vp) && HAS_FUNCTION_CLASS(JSVAL_TO_OBJECT(*vp))) { return true; } debug_only_printf(LC_TMTracer, "fun != tag%u ", tag); return false; } } class TypeCompatibilityVisitor : public SlotVisitorBase { TraceRecorder &mRecorder; JSContext *mCx; JSTraceType *mTypeMap; unsigned mStackSlotNum; bool mOk; public: TypeCompatibilityVisitor (TraceRecorder &recorder, JSTraceType *typeMap) : mRecorder(recorder), mCx(mRecorder.cx), mTypeMap(typeMap), mStackSlotNum(0), mOk(true) {} JS_REQUIRES_STACK JS_ALWAYS_INLINE void visitGlobalSlot(jsval *vp, unsigned n, unsigned slot) { debug_only_printf(LC_TMTracer, "global%d=", n); if (!js_IsEntryTypeCompatible(vp, mTypeMap)) { mOk = false; } else if (!isPromoteInt(mRecorder.get(vp)) && *mTypeMap == TT_INT32) { oracle.markGlobalSlotUndemotable(mCx, slot); mOk = false; } else if (JSVAL_IS_INT(*vp) && *mTypeMap == TT_DOUBLE) { oracle.markGlobalSlotUndemotable(mCx, slot); } mTypeMap++; } JS_REQUIRES_STACK JS_ALWAYS_INLINE bool visitStackSlots(jsval *vp, size_t count, JSStackFrame* fp) { for (size_t i = 0; i < count; ++i) { debug_only_printf(LC_TMTracer, "%s%u=", stackSlotKind(), unsigned(i)); if (!js_IsEntryTypeCompatible(vp, mTypeMap)) { mOk = false; } else if (!isPromoteInt(mRecorder.get(vp)) && *mTypeMap == TT_INT32) { oracle.markStackSlotUndemotable(mCx, mStackSlotNum); mOk = false; } else if (JSVAL_IS_INT(*vp) && *mTypeMap == TT_DOUBLE) { oracle.markStackSlotUndemotable(mCx, mStackSlotNum); } vp++; mTypeMap++; mStackSlotNum++; } return true; } bool isOk() { return mOk; } }; JS_REQUIRES_STACK Fragment* TraceRecorder::findNestedCompatiblePeer(Fragment* f) { JSTraceMonitor* tm; tm = &JS_TRACE_MONITOR(cx); unsigned int ngslots = treeInfo->globalSlots->length(); TreeInfo* ti; for (; f != NULL; f = f->peer) { if (!f->code()) continue; ti = (TreeInfo*)f->vmprivate; debug_only_printf(LC_TMTracer, "checking nested types %p: ", (void*)f); if (ngslots > ti->nGlobalTypes()) specializeTreesToMissingGlobals(cx, globalObj, ti); /* * Determine whether the typemap of the inner tree matches the outer tree's * current state. If the inner tree expects an integer, but the outer tree * doesn't guarantee an integer for that slot, we mark the slot undemotable * and mismatch here. This will force a new tree to be compiled that accepts * a double for the slot. If the inner tree expects a double, but the outer * tree has an integer, we can proceed, but we mark the location undemotable. */ TypeCompatibilityVisitor visitor(*this, ti->typeMap.data()); VisitSlots(visitor, cx, 0, *treeInfo->globalSlots); debug_only_printf(LC_TMTracer, " %s\n", visitor.isOk() ? "match" : ""); if (visitor.isOk()) return f; } return NULL; } class CheckEntryTypeVisitor : public SlotVisitorBase { bool mOk; JSTraceType *mTypeMap; public: CheckEntryTypeVisitor(JSTraceType *typeMap) : mOk(true), mTypeMap(typeMap) {} JS_ALWAYS_INLINE void checkSlot(jsval *vp, char const *name, int i) { debug_only_printf(LC_TMTracer, "%s%d=", name, i); JS_ASSERT(*(uint8_t*)mTypeMap != 0xCD); mOk = js_IsEntryTypeCompatible(vp, mTypeMap++); } JS_REQUIRES_STACK JS_ALWAYS_INLINE void visitGlobalSlot(jsval *vp, unsigned n, unsigned slot) { if (mOk) checkSlot(vp, "global", n); } JS_REQUIRES_STACK JS_ALWAYS_INLINE bool visitStackSlots(jsval *vp, size_t count, JSStackFrame* fp) { for (size_t i = 0; i < count; ++i) { if (!mOk) break; checkSlot(vp++, stackSlotKind(), i); } return mOk; } bool isOk() { return mOk; } }; /** * Check if types are usable for trace execution. * * @param cx Context. * @param ti Tree info of peer we're testing. * @return True if compatible (with or without demotions), false otherwise. */ static JS_REQUIRES_STACK bool js_CheckEntryTypes(JSContext* cx, JSObject* globalObj, TreeInfo* ti) { unsigned int ngslots = ti->globalSlots->length(); JS_ASSERT(ti->nStackTypes == js_NativeStackSlots(cx, 0)); if (ngslots > ti->nGlobalTypes()) specializeTreesToMissingGlobals(cx, globalObj, ti); JS_ASSERT(ti->typeMap.length() == js_NativeStackSlots(cx, 0) + ngslots); JS_ASSERT(ti->typeMap.length() == ti->nStackTypes + ngslots); JS_ASSERT(ti->nGlobalTypes() == ngslots); CheckEntryTypeVisitor visitor(ti->typeMap.data()); VisitSlots(visitor, cx, 0, *ti->globalSlots); debug_only_print0(LC_TMTracer, "\n"); return visitor.isOk(); } /** * Find an acceptable entry tree given a PC. * * @param cx Context. * @param globalObj Global object. * @param f First peer fragment. * @param nodemote If true, will try to find a peer that does not require demotion. * @out count Number of fragments consulted. */ static JS_REQUIRES_STACK Fragment* js_FindVMCompatiblePeer(JSContext* cx, JSObject* globalObj, Fragment* f, uintN& count) { count = 0; for (; f != NULL; f = f->peer) { if (f->vmprivate == NULL) continue; debug_only_printf(LC_TMTracer, "checking vm types %p (ip: %p): ", (void*)f, f->ip); if (js_CheckEntryTypes(cx, globalObj, (TreeInfo*)f->vmprivate)) return f; ++count; } return NULL; } static void LeaveTree(InterpState&, VMSideExit* lr); /** * Executes a tree. */ static JS_REQUIRES_STACK VMSideExit* js_ExecuteTree(JSContext* cx, Fragment* f, uintN& inlineCallCount, VMSideExit** innermostNestedGuardp) { #ifdef MOZ_TRACEVIS TraceVisStateObj tvso(S_EXECUTE); #endif JS_ASSERT(f->root == f && f->code() && f->vmprivate); JSTraceMonitor* tm = &JS_TRACE_MONITOR(cx); JSObject* globalObj = JS_GetGlobalForObject(cx, cx->fp->scopeChain); TreeInfo* ti = (TreeInfo*)f->vmprivate; unsigned ngslots = ti->globalSlots->length(); uint16* gslots = ti->globalSlots->data(); unsigned globalFrameSize = STOBJ_NSLOTS(globalObj); /* Make sure the global object is sane. */ JS_ASSERT(!ngslots || (OBJ_SHAPE(JS_GetGlobalForObject(cx, cx->fp->scopeChain)) == ((VMFragment*)f)->globalShape)); /* Make sure our caller replenished the double pool. */ JS_ASSERT(tm->reservedDoublePoolPtr >= tm->reservedDoublePool + MAX_NATIVE_STACK_SLOTS); /* Reserve objects and stack space now, to make leaving the tree infallible. */ if (!js_ReserveObjects(cx, MAX_CALL_STACK_ENTRIES)) return NULL; #ifdef DEBUG uintN savedProhibitFlush = JS_TRACE_MONITOR(cx).prohibitFlush; #endif /* Setup the interpreter state block, which is followed by the native global frame. */ InterpState* state = (InterpState*)alloca(sizeof(InterpState) + (globalFrameSize+1)*sizeof(double)); state->cx = cx; state->inlineCallCountp = &inlineCallCount; state->innermostNestedGuardp = innermostNestedGuardp; state->outermostTree = ti; state->lastTreeExitGuard = NULL; state->lastTreeCallGuard = NULL; state->rpAtLastTreeCall = NULL; state->builtinStatus = 0; /* Setup the native global frame. */ double* global = (double*)(state+1); /* Setup the native stack frame. */ double stack_buffer[MAX_NATIVE_STACK_SLOTS]; state->stackBase = stack_buffer; state->sp = stack_buffer + (ti->nativeStackBase/sizeof(double)); state->eos = stack_buffer + MAX_NATIVE_STACK_SLOTS; /* Setup the native call stack frame. */ FrameInfo* callstack_buffer[MAX_CALL_STACK_ENTRIES]; state->callstackBase = callstack_buffer; state->rp = callstack_buffer; state->eor = callstack_buffer + MAX_CALL_STACK_ENTRIES; void *reserve; state->stackMark = JS_ARENA_MARK(&cx->stackPool); JS_ARENA_ALLOCATE(reserve, &cx->stackPool, MAX_INTERP_STACK_BYTES); if (!reserve) return NULL; #ifdef DEBUG memset(stack_buffer, 0xCD, sizeof(stack_buffer)); memset(global, 0xCD, (globalFrameSize+1)*sizeof(double)); JS_ASSERT(globalFrameSize <= MAX_GLOBAL_SLOTS); #endif debug_only_stmt(*(uint64*)&global[globalFrameSize] = 0xdeadbeefdeadbeefLL;) debug_only_printf(LC_TMTracer, "entering trace at %s:%u@%u, native stack slots: %u code: %p\n", cx->fp->script->filename, js_FramePCToLineNumber(cx, cx->fp), FramePCOffset(cx->fp), ti->maxNativeStackSlots, f->code()); JS_ASSERT(ti->nGlobalTypes() == ngslots); BuildNativeFrame(cx, globalObj, 0/*callDepth*/, ngslots, gslots, ti->typeMap.data(), global, stack_buffer); union { NIns *code; GuardRecord* (FASTCALL *func)(InterpState*, Fragment*); } u; u.code = f->code(); #ifdef EXECUTE_TREE_TIMER state->startTime = rdtsc(); #endif JS_ASSERT(!tm->tracecx); tm->tracecx = cx; state->prev = cx->interpState; cx->interpState = state; debug_only_stmt(fflush(NULL)); GuardRecord* rec; // Note that the block scoping is crucial here for TraceVis; the // TraceVisStateObj constructors and destructors must run at the right times. { #ifdef MOZ_TRACEVIS TraceVisStateObj tvso_n(S_NATIVE); #endif #if defined(JS_NO_FASTCALL) && defined(NANOJIT_IA32) SIMULATE_FASTCALL(rec, state, NULL, u.func); #else rec = u.func(state, NULL); #endif } VMSideExit* lr = (VMSideExit*)rec->exit; AUDIT(traceTriggered); cx->interpState = state->prev; JS_ASSERT(lr->exitType != LOOP_EXIT || !lr->calldepth); tm->tracecx = NULL; LeaveTree(*state, lr); JS_ASSERT(JS_TRACE_MONITOR(cx).prohibitFlush == savedProhibitFlush); return state->innermost; } static JS_FORCES_STACK void LeaveTree(InterpState& state, VMSideExit* lr) { VOUCH_DOES_NOT_REQUIRE_STACK(); JSContext* cx = state.cx; FrameInfo** callstack = state.callstackBase; double* stack = state.stackBase; /* Except if we find that this is a nested bailout, the guard the call returned is the one we have to use to adjust pc and sp. */ VMSideExit* innermost = lr; /* While executing a tree we do not update state.sp and state.rp even if they grow. Instead, guards tell us by how much sp and rp should be incremented in case of a side exit. When calling a nested tree, however, we actively adjust sp and rp. If we have such frames from outer trees on the stack, then rp will have been adjusted. Before we can process the stack of the frames of the tree we directly exited from, we have to first work our way through the outer frames and generate interpreter frames for them. Once the call stack (rp) is empty, we can process the final frames (which again are not directly visible and only the guard we exited on will tells us about). */ FrameInfo** rp = (FrameInfo**)state.rp; if (lr->exitType == NESTED_EXIT) { VMSideExit* nested = state.lastTreeCallGuard; if (!nested) { /* If lastTreeCallGuard is not set in state, we only have a single level of nesting in this exit, so lr itself is the innermost and outermost nested guard, and hence we set nested to lr. The calldepth of the innermost guard is not added to state.rp, so we do it here manually. For a nesting depth greater than 1 the CallTree builtin already added the innermost guard's calldepth to state.rpAtLastTreeCall. */ nested = lr; rp += lr->calldepth; } else { /* During unwinding state.rp gets overwritten at every step and we restore it here to its state at the innermost nested guard. The builtin already added the calldepth of that innermost guard to rpAtLastTreeCall. */ rp = (FrameInfo**)state.rpAtLastTreeCall; } innermost = state.lastTreeExitGuard; if (state.innermostNestedGuardp) *state.innermostNestedGuardp = nested; JS_ASSERT(nested); JS_ASSERT(nested->exitType == NESTED_EXIT); JS_ASSERT(state.lastTreeExitGuard); JS_ASSERT(state.lastTreeExitGuard->exitType != NESTED_EXIT); } int32_t bs = state.builtinStatus; bool bailed = innermost->exitType == STATUS_EXIT && (bs & JSBUILTIN_BAILED); if (bailed) { /* * Deep-bail case. * * A _FAIL native already called LeaveTree. We already reconstructed * the interpreter stack, in pre-call state, with pc pointing to the * CALL/APPLY op, for correctness. Then we continued in native code. * * First, if we just returned from a slow native, pop its stack frame. */ if (!cx->fp->script) { JSStackFrame *fp = cx->fp; JS_ASSERT(FUN_SLOW_NATIVE(GET_FUNCTION_PRIVATE(cx, fp->callee))); JS_ASSERT(fp->regs == NULL); JS_ASSERT(fp->down->regs != &((JSInlineFrame *) fp)->callerRegs); cx->fp = fp->down; JS_ARENA_RELEASE(&cx->stackPool, ((JSInlineFrame *) fp)->mark); } JS_ASSERT(cx->fp->script); if (!(bs & JSBUILTIN_ERROR)) { /* * The native succeeded (no exception or error). After it returned, the * trace stored the return value (at the top of the native stack) and * then immediately flunked the guard on state->builtinStatus. * * Now LeaveTree has been called again from the tail of * js_ExecuteTree. We are about to return to the interpreter. Adjust * the top stack frame to resume on the next op. */ JS_ASSERT(*cx->fp->regs->pc == JSOP_CALL || *cx->fp->regs->pc == JSOP_APPLY || *cx->fp->regs->pc == JSOP_NEW); uintN argc = GET_ARGC(cx->fp->regs->pc); cx->fp->regs->pc += JSOP_CALL_LENGTH; cx->fp->regs->sp -= argc + 1; JS_ASSERT_IF(!cx->fp->imacpc, cx->fp->slots + cx->fp->script->nfixed + js_ReconstructStackDepth(cx, cx->fp->script, cx->fp->regs->pc) == cx->fp->regs->sp); /* * The return value was not available when we reconstructed the stack, * but we have it now. Box it. */ JSTraceType* typeMap = getStackTypeMap(innermost); NativeToValue(cx, cx->fp->regs->sp[-1], typeMap[innermost->numStackSlots - 1], (jsdouble *) state.sp + innermost->sp_adj / sizeof(jsdouble) - 1); } JSTraceMonitor* tm = &JS_TRACE_MONITOR(cx); if (tm->prohibitFlush && --tm->prohibitFlush == 0 && tm->needFlush) FlushJITCache(cx); return; } JS_ARENA_RELEASE(&cx->stackPool, state.stackMark); while (callstack < rp) { /* Synthesize a stack frame and write out the values in it using the type map pointer on the native call stack. */ js_SynthesizeFrame(cx, **callstack); int slots = FlushNativeStackFrame(cx, 1 /* callDepth */, (JSTraceType*)(*callstack + 1), stack, cx->fp); #ifdef DEBUG JSStackFrame* fp = cx->fp; debug_only_printf(LC_TMTracer, "synthesized deep frame for %s:%u@%u, slots=%d\n", fp->script->filename, js_FramePCToLineNumber(cx, fp), FramePCOffset(fp), slots); #endif /* Keep track of the additional frames we put on the interpreter stack and the native stack slots we consumed. */ ++*state.inlineCallCountp; ++callstack; stack += slots; } /* We already synthesized the frames around the innermost guard. Here we just deal with additional frames inside the tree we are bailing out from. */ JS_ASSERT(rp == callstack); unsigned calldepth = innermost->calldepth; unsigned calldepth_slots = 0; for (unsigned n = 0; n < calldepth; ++n) { calldepth_slots += js_SynthesizeFrame(cx, *callstack[n]); ++*state.inlineCallCountp; #ifdef DEBUG JSStackFrame* fp = cx->fp; debug_only_printf(LC_TMTracer, "synthesized shallow frame for %s:%u@%u\n", fp->script->filename, js_FramePCToLineNumber(cx, fp), FramePCOffset(fp)); #endif } /* Adjust sp and pc relative to the tree we exited from (not the tree we entered into). These are our final values for sp and pc since js_SynthesizeFrame has already taken care of all frames in between. But first we recover fp->blockChain, which comes from the side exit struct. */ JSStackFrame* fp = cx->fp; fp->blockChain = innermost->block; /* If we are not exiting from an inlined frame the state->sp is spbase, otherwise spbase is whatever slots frames around us consume. */ fp->regs->pc = innermost->pc; fp->imacpc = innermost->imacpc; fp->regs->sp = StackBase(fp) + (innermost->sp_adj / sizeof(double)) - calldepth_slots; JS_ASSERT_IF(!fp->imacpc, fp->slots + fp->script->nfixed + js_ReconstructStackDepth(cx, fp->script, fp->regs->pc) == fp->regs->sp); #ifdef EXECUTE_TREE_TIMER uint64 cycles = rdtsc() - state.startTime; #elif defined(JS_JIT_SPEW) uint64 cycles = 0; #endif debug_only_printf(LC_TMTracer, "leaving trace at %s:%u@%u, op=%s, lr=%p, exitType=%s, sp=%d, " "calldepth=%d, cycles=%llu\n", fp->script->filename, js_FramePCToLineNumber(cx, fp), FramePCOffset(fp), js_CodeName[fp->imacpc ? *fp->imacpc : *fp->regs->pc], (void*)lr, getExitName(lr->exitType), fp->regs->sp - StackBase(fp), calldepth, cycles); /* If this trace is part of a tree, later branches might have added additional globals for which we don't have any type information available in the side exit. We merge in this information from the entry type-map. See also comment in the constructor of TraceRecorder why this is always safe to do. */ TreeInfo* outermostTree = state.outermostTree; uint16* gslots = outermostTree->globalSlots->data(); unsigned ngslots = outermostTree->globalSlots->length(); JS_ASSERT(ngslots == outermostTree->nGlobalTypes()); JSTraceType* globalTypeMap; /* Are there enough globals? This is the ideal fast path. */ if (innermost->numGlobalSlots == ngslots) { globalTypeMap = getGlobalTypeMap(innermost); /* Otherwise, merge the typemap of the innermost entry and exit together. This should always work because it is invalid for nested trees or linked trees to have incompatible types. Thus, whenever a new global type is lazily added into a tree, all dependent and linked trees are immediately specialized (see bug 476653). */ } else { TreeInfo* ti = (TreeInfo*)innermost->from->root->vmprivate; JS_ASSERT(ti->nGlobalTypes() == ngslots); JS_ASSERT(ti->nGlobalTypes() > innermost->numGlobalSlots); globalTypeMap = (JSTraceType*)alloca(ngslots * sizeof(JSTraceType)); memcpy(globalTypeMap, getGlobalTypeMap(innermost), innermost->numGlobalSlots); memcpy(globalTypeMap + innermost->numGlobalSlots, ti->globalTypeMap() + innermost->numGlobalSlots, ti->nGlobalTypes() - innermost->numGlobalSlots); } /* write back native stack frame */ #ifdef DEBUG int slots = #endif FlushNativeStackFrame(cx, innermost->calldepth, getStackTypeMap(innermost), stack, NULL); JS_ASSERT(unsigned(slots) == innermost->numStackSlots); if (innermost->nativeCalleeWord) SynthesizeSlowNativeFrame(cx, innermost); /* write back interned globals */ double* global = (double*)(&state + 1); FlushNativeGlobalFrame(cx, global, ngslots, gslots, globalTypeMap); JS_ASSERT(*(uint64*)&global[STOBJ_NSLOTS(JS_GetGlobalForObject(cx, cx->fp->scopeChain))] == 0xdeadbeefdeadbeefLL); cx->nativeVp = NULL; #ifdef DEBUG // Verify that our state restoration worked. for (JSStackFrame* fp = cx->fp; fp; fp = fp->down) { JS_ASSERT_IF(fp->callee, JSVAL_IS_OBJECT(fp->argv[-1])); } #endif #ifdef JS_JIT_SPEW if (innermost->exitType != TIMEOUT_EXIT) AUDIT(sideExitIntoInterpreter); else AUDIT(timeoutIntoInterpreter); #endif state.innermost = innermost; } JS_REQUIRES_STACK bool js_MonitorLoopEdge(JSContext* cx, uintN& inlineCallCount) { #ifdef MOZ_TRACEVIS TraceVisStateObj tvso(S_MONITOR); #endif JSTraceMonitor* tm = &JS_TRACE_MONITOR(cx); /* Is the recorder currently active? */ if (tm->recorder) { jsbytecode* innerLoopHeaderPC = cx->fp->regs->pc; if (js_RecordLoopEdge(cx, tm->recorder, inlineCallCount)) return true; /* * js_RecordLoopEdge will invoke an inner tree if we have a matching one. If we * arrive here, that tree didn't run to completion and instead we mis-matched * or the inner tree took a side exit other than the loop exit. We are thus * no longer guaranteed to be parked on the same loop header js_MonitorLoopEdge * was called for. In fact, this might not even be a loop header at all. Hence * if the program counter no longer hovers over the inner loop header, return to * the interpreter and do not attempt to trigger or record a new tree at this * location. */ if (innerLoopHeaderPC != cx->fp->regs->pc) { #ifdef MOZ_TRACEVIS tvso.r = R_INNER_SIDE_EXIT; #endif return false; } } JS_ASSERT(!tm->recorder); /* Check the pool of reserved doubles (this might trigger a GC). */ if (tm->reservedDoublePoolPtr < (tm->reservedDoublePool + MAX_NATIVE_STACK_SLOTS) && !js_ReplenishReservedPool(cx, tm)) { #ifdef MOZ_TRACEVIS tvso.r = R_DOUBLES; #endif return false; /* Out of memory, don't try to record now. */ } /* Make sure the shape of the global object still matches (this might flush the JIT cache). */ JSObject* globalObj = JS_GetGlobalForObject(cx, cx->fp->scopeChain); uint32 globalShape = -1; SlotList* globalSlots = NULL; if (!CheckGlobalObjectShape(cx, tm, globalObj, &globalShape, &globalSlots)) { js_Backoff(cx, cx->fp->regs->pc); return false; } /* Do not enter the JIT code with a pending operation callback. */ if (cx->operationCallbackFlag) { #ifdef MOZ_TRACEVIS tvso.r = R_CALLBACK_PENDING; #endif return false; } jsbytecode* pc = cx->fp->regs->pc; uint32 argc = cx->fp->argc; Fragment* f = getLoop(tm, pc, globalObj, globalShape, argc); if (!f) f = getAnchor(tm, pc, globalObj, globalShape, argc); if (!f) { FlushJITCache(cx); #ifdef MOZ_TRACEVIS tvso.r = R_OOM_GETANCHOR; #endif return false; } /* If we have no code in the anchor and no peers, we definitively won't be able to activate any trees so, start compiling. */ if (!f->code() && !f->peer) { record: if (++f->hits() < HOTLOOP) { #ifdef MOZ_TRACEVIS tvso.r = f->hits() < 1 ? R_BACKED_OFF : R_COLD; #endif return false; } /* We can give RecordTree the root peer. If that peer is already taken, it will walk the peer list and find us a free slot or allocate a new tree if needed. */ bool rv = js_RecordTree(cx, tm, f->first, NULL, 0, globalObj, globalShape, globalSlots, argc); #ifdef MOZ_TRACEVIS if (!rv) tvso.r = R_FAIL_RECORD_TREE; #endif return rv; } debug_only_printf(LC_TMTracer, "Looking for compat peer %d@%d, from %p (ip: %p)\n", js_FramePCToLineNumber(cx, cx->fp), FramePCOffset(cx->fp), (void*)f, f->ip); uintN count; Fragment* match = js_FindVMCompatiblePeer(cx, globalObj, f, count); if (!match) { if (count < MAXPEERS) goto record; /* If we hit the max peers ceiling, don't try to lookup fragments all the time. Thats expensive. This must be a rather type-unstable loop. */ debug_only_print0(LC_TMTracer, "Blacklisted: too many peer trees.\n"); js_Blacklist((jsbytecode*) f->root->ip); #ifdef MOZ_TRACEVIS tvso.r = R_MAX_PEERS; #endif return false; } VMSideExit* lr = NULL; VMSideExit* innermostNestedGuard = NULL; lr = js_ExecuteTree(cx, match, inlineCallCount, &innermostNestedGuard); if (!lr) { #ifdef MOZ_TRACEVIS tvso.r = R_FAIL_EXECUTE_TREE; #endif return false; } /* If we exit on a branch, or on a tree call guard, try to grow the inner tree (in case of a branch exit), or the tree nested around the tree we exited from (in case of the tree call guard). */ bool rv; switch (lr->exitType) { case UNSTABLE_LOOP_EXIT: rv = js_AttemptToStabilizeTree(cx, globalObj, lr, NULL, NULL); #ifdef MOZ_TRACEVIS if (!rv) tvso.r = R_FAIL_STABILIZE; #endif return rv; case OVERFLOW_EXIT: oracle.markInstructionUndemotable(cx->fp->regs->pc); /* fall through */ case BRANCH_EXIT: case CASE_EXIT: return js_AttemptToExtendTree(cx, lr, NULL, NULL #ifdef MOZ_TRACEVIS , &tvso #endif ); case LOOP_EXIT: if (innermostNestedGuard) return js_AttemptToExtendTree(cx, innermostNestedGuard, lr, NULL #ifdef MOZ_TRACEVIS , &tvso #endif ); #ifdef MOZ_TRACEVIS tvso.r = R_NO_EXTEND_OUTER; #endif return false; #ifdef MOZ_TRACEVIS case MISMATCH_EXIT: tvso.r = R_MISMATCH_EXIT; return false; case OOM_EXIT: tvso.r = R_OOM_EXIT; return false; case TIMEOUT_EXIT: tvso.r = R_TIMEOUT_EXIT; return false; case DEEP_BAIL_EXIT: tvso.r = R_DEEP_BAIL_EXIT; return false; case STATUS_EXIT: tvso.r = R_STATUS_EXIT; return false; #endif default: /* No, this was an unusual exit (i.e. out of memory/GC), so just resume interpretation. */ #ifdef MOZ_TRACEVIS tvso.r = R_OTHER_EXIT; #endif return false; } } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::monitorRecording(JSContext* cx, TraceRecorder* tr, JSOp op) { /* Process needFlush and deepAbort() requests now. */ if (JS_TRACE_MONITOR(cx).needFlush) { FlushJITCache(cx); return JSRS_STOP; } if (tr->wasDeepAborted()) { js_AbortRecording(cx, "deep abort requested"); return JSRS_STOP; } JS_ASSERT(!tr->fragment->lastIns); /* * Clear one-shot state used to communicate between record_JSOP_CALL and post- * opcode-case-guts record hook (record_NativeCallComplete). */ tr->pendingTraceableNative = NULL; tr->newobj_ins = NULL; debug_only_stmt( if (js_LogController.lcbits & LC_TMRecorder) { js_Disassemble1(cx, cx->fp->script, cx->fp->regs->pc, cx->fp->imacpc ? 0 : cx->fp->regs->pc - cx->fp->script->code, !cx->fp->imacpc, stdout); } ) /* If op is not a break or a return from a loop, continue recording and follow the trace. We check for imacro-calling bytecodes inside each switch case to resolve the if (JSOP_IS_IMACOP(x)) conditions at compile time. */ JSRecordingStatus status; #ifdef DEBUG bool wasInImacro = (cx->fp->imacpc != NULL); #endif switch (op) { default: status = JSRS_ERROR; goto stop_recording; # define OPDEF(x,val,name,token,length,nuses,ndefs,prec,format) \ case x: \ status = tr->record_##x(); \ if (JSOP_IS_IMACOP(x)) \ goto imacro; \ break; # include "jsopcode.tbl" # undef OPDEF } JS_ASSERT(status != JSRS_IMACRO); JS_ASSERT_IF(!wasInImacro, cx->fp->imacpc == NULL); /* Process deepAbort() requests now. */ if (tr->wasDeepAborted()) { js_AbortRecording(cx, "deep abort requested"); return JSRS_STOP; } if (JS_TRACE_MONITOR(cx).fragmento->assm()->error()) { js_AbortRecording(cx, "error during recording"); return JSRS_STOP; } if (tr->lirbuf->outOMem() || js_OverfullFragmento(&JS_TRACE_MONITOR(cx), JS_TRACE_MONITOR(cx).fragmento)) { js_AbortRecording(cx, "no more LIR memory"); FlushJITCache(cx); return JSRS_STOP; } imacro: if (!STATUS_ABORTS_RECORDING(status)) return status; stop_recording: /* If we recorded the end of the trace, destroy the recorder now. */ if (tr->fragment->lastIns) { js_DeleteRecorder(cx); return status; } /* Looks like we encountered an error condition. Abort recording. */ js_AbortRecording(cx, js_CodeName[op]); return status; } JS_REQUIRES_STACK void js_AbortRecording(JSContext* cx, const char* reason) { JSTraceMonitor* tm = &JS_TRACE_MONITOR(cx); JS_ASSERT(tm->recorder != NULL); AUDIT(recorderAborted); /* Abort the trace and blacklist its starting point. */ Fragment* f = tm->recorder->getFragment(); /* * If the recorder already had its fragment disposed, or we actually finished * recording and this recorder merely is passing through the deep abort state * to the next recorder on the stack, just destroy the recorder. There is * nothing to abort. */ if (!f || f->lastIns) { js_DeleteRecorder(cx); return; } JS_ASSERT(!f->vmprivate); #ifdef DEBUG TreeInfo* ti = tm->recorder->getTreeInfo(); debug_only_printf(LC_TMAbort, "Abort recording of tree %s:%d@%d at %s:%d@%d: %s.\n", ti->treeFileName, ti->treeLineNumber, ti->treePCOffset, cx->fp->script->filename, js_FramePCToLineNumber(cx, cx->fp), FramePCOffset(cx->fp), reason); #endif js_Backoff(cx, (jsbytecode*) f->root->ip, f->root); /* * If js_DeleteRecorder flushed the code cache, we can't rely on f any more. */ if (!js_DeleteRecorder(cx)) return; /* * If this is the primary trace and we didn't succeed compiling, trash the * TreeInfo object. */ if (!f->code() && (f->root == f)) js_TrashTree(cx, f); } #if defined NANOJIT_IA32 static bool js_CheckForSSE2() { int features = 0; #if defined _MSC_VER __asm { pushad mov eax, 1 cpuid mov features, edx popad } #elif defined __GNUC__ asm("xchg %%esi, %%ebx\n" /* we can't clobber ebx on gcc (PIC register) */ "mov $0x01, %%eax\n" "cpuid\n" "mov %%edx, %0\n" "xchg %%esi, %%ebx\n" : "=m" (features) : /* We have no inputs */ : "%eax", "%esi", "%ecx", "%edx" ); #elif defined __SUNPRO_C || defined __SUNPRO_CC asm("push %%ebx\n" "mov $0x01, %%eax\n" "cpuid\n" "pop %%ebx\n" : "=d" (features) : /* We have no inputs */ : "%eax", "%ecx" ); #endif return (features & (1<<26)) != 0; } #endif #if defined(NANOJIT_ARM) #if defined(_MSC_VER) && defined(WINCE) // these come in from jswince.asm extern "C" int js_arm_try_thumb_op(); extern "C" int js_arm_try_armv6t2_op(); extern "C" int js_arm_try_armv5_op(); extern "C" int js_arm_try_armv6_op(); extern "C" int js_arm_try_armv7_op(); extern "C" int js_arm_try_vfp_op(); static bool js_arm_check_thumb() { bool ret = false; __try { js_arm_try_thumb_op(); ret = true; } __except(GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION) { ret = false; } return ret; } static bool js_arm_check_thumb2() { bool ret = false; __try { js_arm_try_armv6t2_op(); ret = true; } __except(GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION) { ret = false; } return ret; } static unsigned int js_arm_check_arch() { unsigned int arch = 4; __try { js_arm_try_armv5_op(); arch = 5; js_arm_try_armv6_op(); arch = 6; js_arm_try_armv7_op(); arch = 7; } __except(GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION) { } return arch; } static bool js_arm_check_vfp() { bool ret = false; __try { js_arm_try_vfp_op(); ret = true; } __except(GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION) { ret = false; } return ret; } #elif defined(__GNUC__) && defined(AVMPLUS_LINUX) #include #include #include #include #include #include #include #include // Assume ARMv4 by default. static unsigned int arm_arch = 4; static bool arm_has_thumb = false; static bool arm_has_vfp = false; static bool arm_has_neon = false; static bool arm_has_iwmmxt = false; static bool arm_tests_initialized = false; static void arm_read_auxv() { int fd; Elf32_auxv_t aux; fd = open("/proc/self/auxv", O_RDONLY); if (fd > 0) { while (read(fd, &aux, sizeof(Elf32_auxv_t))) { if (aux.a_type == AT_HWCAP) { uint32_t hwcap = aux.a_un.a_val; if (getenv("ARM_FORCE_HWCAP")) hwcap = strtoul(getenv("ARM_FORCE_HWCAP"), NULL, 0); // hardcode these values to avoid depending on specific versions // of the hwcap header, e.g. HWCAP_NEON arm_has_thumb = (hwcap & 4) != 0; arm_has_vfp = (hwcap & 64) != 0; arm_has_iwmmxt = (hwcap & 512) != 0; // this flag is only present on kernel 2.6.29 arm_has_neon = (hwcap & 4096) != 0; } else if (aux.a_type == AT_PLATFORM) { const char *plat = (const char*) aux.a_un.a_val; if (getenv("ARM_FORCE_PLATFORM")) plat = getenv("ARM_FORCE_PLATFORM"); // The platform string has the form "v[0-9][lb]". The "l" or "b" indicate little- // or big-endian variants and the digit indicates the version of the platform. // We can only accept ARMv4 and above, but allow anything up to ARMv9 for future // processors. Architectures newer than ARMv7 are assumed to be // backwards-compatible with ARMv7. if ((plat[0] == 'v') && (plat[1] >= '4') && (plat[1] <= '9') && ((plat[2] == 'l') || (plat[2] == 'b'))) { arm_arch = plat[1] - '0'; } else { // For production code, ignore invalid (or unexpected) platform strings and // fall back to the default. For debug code, use an assertion to catch this. JS_ASSERT(false); } } } close (fd); // if we don't have 2.6.29, we have to do this hack; set // the env var to trust HWCAP. if (!getenv("ARM_TRUST_HWCAP") && (arm_arch >= 7)) arm_has_neon = true; } arm_tests_initialized = true; } static bool js_arm_check_thumb() { if (!arm_tests_initialized) arm_read_auxv(); return arm_has_thumb; } static bool js_arm_check_thumb2() { if (!arm_tests_initialized) arm_read_auxv(); // ARMv6T2 also supports Thumb2, but Linux doesn't provide an easy way to test for this as // there is no associated bit in auxv. ARMv7 always supports Thumb2, and future architectures // are assumed to be backwards-compatible. return (arm_arch >= 7); } static unsigned int js_arm_check_arch() { if (!arm_tests_initialized) arm_read_auxv(); return arm_arch; } static bool js_arm_check_vfp() { if (!arm_tests_initialized) arm_read_auxv(); return arm_has_vfp; } #else #warning Not sure how to check for architecture variant on your platform. Assuming ARMv4. static bool js_arm_check_thumb() { return false; } static bool js_arm_check_thumb2() { return false; } static unsigned int js_arm_check_arch() { return 4; } static bool js_arm_check_vfp() { return false; } #endif #endif /* NANOJIT_ARM */ #define K *1024 #define M K K #define G K M void js_SetMaxCodeCacheBytes(JSContext* cx, uint32 bytes) { JSTraceMonitor* tm = &JS_THREAD_DATA(cx)->traceMonitor; JS_ASSERT(tm->fragmento && tm->reFragmento); if (bytes > 1 G) bytes = 1 G; if (bytes < 128 K) bytes = 128 K; tm->maxCodeCacheBytes = bytes; } void js_InitJIT(JSTraceMonitor *tm) { #if defined JS_JIT_SPEW /* Set up debug logging */ if (!did_we_set_up_debug_logging) { js_InitJITLogController(); did_we_set_up_debug_logging = true; } #else memset(&js_LogController, 0, sizeof(js_LogController)); #endif if (!did_we_check_processor_features) { #if defined NANOJIT_IA32 avmplus::AvmCore::config.use_cmov = avmplus::AvmCore::config.sse2 = js_CheckForSSE2(); #endif #if defined NANOJIT_ARM bool arm_vfp = js_arm_check_vfp(); bool arm_thumb = js_arm_check_thumb(); bool arm_thumb2 = js_arm_check_thumb2(); unsigned int arm_arch = js_arm_check_arch(); avmplus::AvmCore::config.vfp = arm_vfp; avmplus::AvmCore::config.soft_float = !arm_vfp; avmplus::AvmCore::config.thumb = arm_thumb; avmplus::AvmCore::config.thumb2 = arm_thumb2; avmplus::AvmCore::config.arch = arm_arch; // Sanity-check the configuration detection. // * We don't understand architectures prior to ARMv4. JS_ASSERT(arm_arch >= 4); // * All architectures support Thumb with the possible exception of ARMv4. JS_ASSERT((arm_thumb) || (arm_arch == 4)); // * Only ARMv6T2 and ARMv7(+) support Thumb2, but ARMv6 does not. JS_ASSERT((arm_thumb2) || (arm_arch <= 6)); // * All architectures that support Thumb2 also support Thumb. JS_ASSERT((arm_thumb2 && arm_thumb) || (!arm_thumb2)); #endif did_we_check_processor_features = true; } /* * Set the default size for the code cache to 16MB. */ tm->maxCodeCacheBytes = 16 M; if (!tm->recordAttempts.ops) { JS_DHashTableInit(&tm->recordAttempts, JS_DHashGetStubOps(), NULL, sizeof(PCHashEntry), JS_DHASH_DEFAULT_CAPACITY(PC_HASH_COUNT)); } if (!tm->fragmento) { JS_ASSERT(!tm->reservedDoublePool); Fragmento* fragmento = new (&gc) Fragmento(core, &js_LogController, 32); verbose_only(fragmento->labels = new (&gc) LabelMap(core);) tm->fragmento = fragmento; tm->lirbuf = new (&gc) LirBuffer(fragmento); #ifdef DEBUG tm->lirbuf->names = new (&gc) LirNameMap(&gc, tm->fragmento->labels); #endif for (size_t i = 0; i < MONITOR_N_GLOBAL_STATES; ++i) { tm->globalStates[i].globalShape = -1; JS_ASSERT(!tm->globalStates[i].globalSlots); tm->globalStates[i].globalSlots = new (&gc) SlotList(); } tm->reservedDoublePoolPtr = tm->reservedDoublePool = new jsval[MAX_NATIVE_STACK_SLOTS]; memset(tm->vmfragments, 0, sizeof(tm->vmfragments)); } if (!tm->reFragmento) { Fragmento* fragmento = new (&gc) Fragmento(core, &js_LogController, 32); verbose_only(fragmento->labels = new (&gc) LabelMap(core);) tm->reFragmento = fragmento; tm->reLirBuf = new (&gc) LirBuffer(fragmento); } #if !defined XP_WIN debug_only(memset(&jitstats, 0, sizeof(jitstats))); #endif } void js_FinishJIT(JSTraceMonitor *tm) { #ifdef JS_JIT_SPEW if (jitstats.recorderStarted) { debug_only_printf(LC_TMStats, "recorder: started(%llu), aborted(%llu), completed(%llu), different header(%llu), " "trees trashed(%llu), slot promoted(%llu), unstable loop variable(%llu), " "breaks(%llu), returns(%llu), unstableInnerCalls(%llu), blacklisted(%llu)\n", jitstats.recorderStarted, jitstats.recorderAborted, jitstats.traceCompleted, jitstats.returnToDifferentLoopHeader, jitstats.treesTrashed, jitstats.slotPromoted, jitstats.unstableLoopVariable, jitstats.breakLoopExits, jitstats.returnLoopExits, jitstats.noCompatInnerTrees, jitstats.blacklisted); debug_only_printf(LC_TMStats, "monitor: triggered(%llu), exits(%llu), type mismatch(%llu), " "global mismatch(%llu)\n", jitstats.traceTriggered, jitstats.sideExitIntoInterpreter, jitstats.typeMapMismatchAtEntry, jitstats.globalShapeMismatchAtEntry); } #endif if (tm->fragmento != NULL) { JS_ASSERT(tm->reservedDoublePool); verbose_only(delete tm->fragmento->labels;) #ifdef DEBUG delete tm->lirbuf->names; tm->lirbuf->names = NULL; #endif delete tm->lirbuf; tm->lirbuf = NULL; if (tm->recordAttempts.ops) JS_DHashTableFinish(&tm->recordAttempts); for (size_t i = 0; i < FRAGMENT_TABLE_SIZE; ++i) { VMFragment* f = tm->vmfragments[i]; while(f) { VMFragment* next = f->next; tm->fragmento->clearFragment(f); f = next; } tm->vmfragments[i] = NULL; } delete tm->fragmento; tm->fragmento = NULL; for (size_t i = 0; i < MONITOR_N_GLOBAL_STATES; ++i) { JS_ASSERT(tm->globalStates[i].globalSlots); delete tm->globalStates[i].globalSlots; } delete[] tm->reservedDoublePool; tm->reservedDoublePool = tm->reservedDoublePoolPtr = NULL; } if (tm->reFragmento != NULL) { delete tm->reLirBuf; verbose_only(delete tm->reFragmento->labels;) delete tm->reFragmento; } } void TraceRecorder::pushAbortStack() { JSTraceMonitor* tm = &JS_TRACE_MONITOR(cx); JS_ASSERT(tm->abortStack != this); nextRecorderToAbort = tm->abortStack; tm->abortStack = this; } void TraceRecorder::popAbortStack() { JSTraceMonitor* tm = &JS_TRACE_MONITOR(cx); JS_ASSERT(tm->abortStack == this); tm->abortStack = nextRecorderToAbort; nextRecorderToAbort = NULL; } void js_PurgeJITOracle() { oracle.clear(); } static JSDHashOperator js_PurgeScriptRecordingAttempts(JSDHashTable *table, JSDHashEntryHdr *hdr, uint32 number, void *arg) { PCHashEntry *e = (PCHashEntry *)hdr; JSScript *script = (JSScript *)arg; jsbytecode *pc = (jsbytecode *)e->key; if (JS_UPTRDIFF(pc, script->code) < script->length) return JS_DHASH_REMOVE; return JS_DHASH_NEXT; } /* * Call 'action' for each root fragment created for 'script'. */ template static void js_IterateScriptFragments(JSContext* cx, JSScript* script, FragmentAction action) { JSTraceMonitor* tm = &JS_TRACE_MONITOR(cx); for (size_t i = 0; i < FRAGMENT_TABLE_SIZE; ++i) { for (VMFragment **f = &(tm->vmfragments[i]); *f; ) { VMFragment* frag = *f; /* Disable future use of any script-associated VMFragment.*/ if (JS_UPTRDIFF(frag->ip, script->code) < script->length) { JS_ASSERT(frag->root == frag); VMFragment* next = frag->next; if (action(cx, tm, frag)) { debug_only_printf(LC_TMTracer, "Disconnecting VMFragment %p " "with ip %p, in range [%p,%p).\n", (void*)frag, frag->ip, script->code, script->code + script->length); *f = next; } else { f = &((*f)->next); } } else { f = &((*f)->next); } } } } static bool trashTreeAction(JSContext* cx, JSTraceMonitor* tm, Fragment* frag) { for (Fragment *p = frag; p; p = p->peer) js_TrashTree(cx, p); return false; } static bool clearFragmentAction(JSContext* cx, JSTraceMonitor* tm, Fragment* frag) { tm->fragmento->clearFragment(frag); return true; } JS_REQUIRES_STACK void js_PurgeScriptFragments(JSContext* cx, JSScript* script) { if (!TRACING_ENABLED(cx)) return; debug_only_printf(LC_TMTracer, "Purging fragments for JSScript %p.\n", (void*)script); /* * js_TrashTree trashes dependent trees recursively, so we must do all the trashing * before clearing in order to avoid calling js_TrashTree with a deleted fragment. */ js_IterateScriptFragments(cx, script, trashTreeAction); js_IterateScriptFragments(cx, script, clearFragmentAction); JSTraceMonitor* tm = &JS_TRACE_MONITOR(cx); JS_DHashTableEnumerate(&(tm->recordAttempts), js_PurgeScriptRecordingAttempts, script); } bool js_OverfullFragmento(JSTraceMonitor* tm, Fragmento *fragmento) { /* * You might imagine the outOMem flag on the lirbuf is sufficient * to model the notion of "running out of memory", but there are actually * two separate issues involved: * * 1. The process truly running out of memory: malloc() or mmap() * failed. * * 2. The limit we put on the "intended size" of the tracemonkey code * cache, in pages, has been exceeded. * * Condition 1 doesn't happen very often, but we're obliged to try to * safely shut down and signal the rest of spidermonkey when it * does. Condition 2 happens quite regularly. * * Presently, the code in this file doesn't check the outOMem condition * often enough, and frequently misuses the unchecked results of * lirbuffer insertions on the asssumption that it will notice the * outOMem flag "soon enough" when it returns to the monitorRecording * function. This turns out to be a false assumption if we use outOMem * to signal condition 2: we regularly provoke "passing our intended * size" and regularly fail to notice it in time to prevent writing * over the end of an artificially self-limited LIR buffer. * * To mitigate, though not completely solve, this problem, we're * modeling the two forms of memory exhaustion *separately* for the * time being: condition 1 is handled by the outOMem flag inside * nanojit, and condition 2 is being handled independently *here*. So * we construct our fragmentos to use all available memory they like, * and only report outOMem to us when there is literally no OS memory * left. Merely purging our cache when we hit our highwater mark is * handled by the (few) callers of this function. * */ jsuint maxsz = tm->maxCodeCacheBytes; if (fragmento == tm->fragmento) { if (tm->prohibitFlush) return false; } else { /* * At the time of making the code cache size configurable, we were using * 16 MB for the main code cache and 1 MB for the regular expression code * cache. We will stick to this 16:1 ratio here until we unify the two * code caches. */ maxsz /= 16; } return (fragmento->cacheUsed() > maxsz); } JS_FORCES_STACK JS_FRIEND_API(void) js_DeepBail(JSContext *cx) { JS_ASSERT(JS_ON_TRACE(cx)); /* * Exactly one context on the current thread is on trace. Find out which * one. (Most callers cannot guarantee that it's cx.) */ JSTraceMonitor *tm = &JS_TRACE_MONITOR(cx); JSContext *tracecx = tm->tracecx; /* It's a bug if a non-FAIL_STATUS builtin gets here. */ JS_ASSERT(tracecx->bailExit); tm->tracecx = NULL; tm->prohibitFlush++; debug_only_print0(LC_TMTracer, "Deep bail.\n"); LeaveTree(*tracecx->interpState, tracecx->bailExit); tracecx->bailExit = NULL; tracecx->interpState->builtinStatus |= JSBUILTIN_BAILED; } JS_REQUIRES_STACK jsval& TraceRecorder::argval(unsigned n) const { JS_ASSERT(n < cx->fp->fun->nargs); return cx->fp->argv[n]; } JS_REQUIRES_STACK jsval& TraceRecorder::varval(unsigned n) const { JS_ASSERT(n < cx->fp->script->nslots); return cx->fp->slots[n]; } JS_REQUIRES_STACK jsval& TraceRecorder::stackval(int n) const { jsval* sp = cx->fp->regs->sp; return sp[n]; } JS_REQUIRES_STACK LIns* TraceRecorder::scopeChain() const { return lir->insLoad(LIR_ldp, lir->insLoad(LIR_ldp, cx_ins, offsetof(JSContext, fp)), offsetof(JSStackFrame, scopeChain)); } static inline bool FrameInRange(JSStackFrame* fp, JSStackFrame *target, unsigned callDepth) { while (fp != target) { if (callDepth-- == 0) return false; if (!(fp = fp->down)) return false; } return true; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::activeCallOrGlobalSlot(JSObject* obj, jsval*& vp) { // Lookup a name in the scope chain, arriving at a property either in the // global object or some call object's fp->slots, and import that property // into the trace's native stack frame. This could theoretically do *lookup* // through the property cache, but there is little performance to be gained // by doing so since at trace-execution time the underlying object (call // object or global object) will not be consulted at all: the jsval* // returned from this function will map (in the tracker) to a LIns* directly // defining a slot in the trace's native stack. JS_ASSERT(obj != globalObj); JSAtom* atom = atoms[GET_INDEX(cx->fp->regs->pc)]; JSObject* obj2; JSProperty* prop; if (!js_FindProperty(cx, ATOM_TO_JSID(atom), &obj, &obj2, &prop)) ABORT_TRACE_ERROR("error in js_FindProperty"); if (!prop) ABORT_TRACE("failed to find name in non-global scope chain"); if (obj == globalObj) { JSScopeProperty* sprop = (JSScopeProperty*) prop; if (obj2 != obj) { OBJ_DROP_PROPERTY(cx, obj2, prop); ABORT_TRACE("prototype property"); } if (!isValidSlot(OBJ_SCOPE(obj), sprop)) { OBJ_DROP_PROPERTY(cx, obj2, prop); return JSRS_STOP; } if (!lazilyImportGlobalSlot(sprop->slot)) { OBJ_DROP_PROPERTY(cx, obj2, prop); ABORT_TRACE("lazy import of global slot failed"); } vp = &STOBJ_GET_SLOT(obj, sprop->slot); OBJ_DROP_PROPERTY(cx, obj2, prop); return JSRS_CONTINUE; } if (wasDeepAborted()) ABORT_TRACE("deep abort from property lookup"); if (obj == obj2 && OBJ_GET_CLASS(cx, obj) == &js_CallClass) { JSStackFrame* cfp = (JSStackFrame*) JS_GetPrivate(cx, obj); if (cfp && FrameInRange(cx->fp, cfp, callDepth)) { JSScopeProperty* sprop = (JSScopeProperty*) prop; uint32 setflags = (js_CodeSpec[*cx->fp->regs->pc].format & (JOF_SET | JOF_INCDEC | JOF_FOR)); if (setflags && (sprop->attrs & JSPROP_READONLY)) ABORT_TRACE("writing to a read-only property"); uintN slot = sprop->shortid; vp = NULL; if (sprop->getter == js_GetCallArg) { JS_ASSERT(slot < cfp->fun->nargs); vp = &cfp->argv[slot]; } else if (sprop->getter == js_GetCallVar) { JS_ASSERT(slot < cfp->script->nslots); vp = &cfp->slots[slot]; } OBJ_DROP_PROPERTY(cx, obj2, prop); if (!vp) ABORT_TRACE("dynamic property of Call object"); return JSRS_CONTINUE; } } OBJ_DROP_PROPERTY(cx, obj2, prop); ABORT_TRACE("fp->scopeChain is not global or active call object"); } JS_REQUIRES_STACK LIns* TraceRecorder::arg(unsigned n) { return get(&argval(n)); } JS_REQUIRES_STACK void TraceRecorder::arg(unsigned n, LIns* i) { set(&argval(n), i); } JS_REQUIRES_STACK LIns* TraceRecorder::var(unsigned n) { return get(&varval(n)); } JS_REQUIRES_STACK void TraceRecorder::var(unsigned n, LIns* i) { set(&varval(n), i); } JS_REQUIRES_STACK LIns* TraceRecorder::stack(int n) { return get(&stackval(n)); } JS_REQUIRES_STACK void TraceRecorder::stack(int n, LIns* i) { set(&stackval(n), i, n >= 0); } extern jsdouble FASTCALL js_dmod(jsdouble a, jsdouble b); JS_REQUIRES_STACK LIns* TraceRecorder::alu(LOpcode v, jsdouble v0, jsdouble v1, LIns* s0, LIns* s1) { /* * To even consider this operation for demotion, both operands have to be * integers and the oracle must not give us a negative hint for the * instruction. */ if (oracle.isInstructionUndemotable(cx->fp->regs->pc) || !isPromoteInt(s0) || !isPromoteInt(s1)) { out: if (v == LIR_fmod) { LIns* args[] = { s1, s0 }; return lir->insCall(&js_dmod_ci, args); } LIns* result = lir->ins2(v, s0, s1); JS_ASSERT_IF(s0->isconstq() && s1->isconstq(), result->isconstq()); return result; } jsdouble r; switch (v) { case LIR_fadd: r = v0 + v1; break; case LIR_fsub: r = v0 - v1; break; case LIR_fmul: r = v0 * v1; if (r == 0.0) goto out; break; #ifdef NANOJIT_IA32 case LIR_fdiv: if (v1 == 0) goto out; r = v0 / v1; break; case LIR_fmod: if (v1 == 0) goto out; r = js_dmod(v0, v1); break; #endif default: goto out; } /* * The result must be an integer at record time, otherwise there is no * point in trying to demote it. */ if (jsint(r) != r || JSDOUBLE_IS_NEGZERO(r)) goto out; LIns* d0 = ::demote(lir, s0); LIns* d1 = ::demote(lir, s1); /* * Speculatively emit an integer operation, betting that at runtime we * will get integer results again. */ VMSideExit* exit; LIns* result; switch (v) { #ifdef NANOJIT_IA32 case LIR_fdiv: if (d0->isconst() && d1->isconst()) return lir->ins1(LIR_i2f, lir->insImm(jsint(r))); exit = snapshot(OVERFLOW_EXIT); /* * Make sure we don't trigger division by zero at runtime. */ if (!d1->isconst()) guard(false, lir->ins_eq0(d1), exit); result = lir->ins2(v = LIR_div, d0, d1); /* * As long the modulus is zero, the result is an integer. */ guard(true, lir->ins_eq0(lir->ins1(LIR_mod, result)), exit); break; case LIR_fmod: { if (d0->isconst() && d1->isconst()) return lir->ins1(LIR_i2f, lir->insImm(jsint(r))); exit = snapshot(OVERFLOW_EXIT); /* * Make sure we don't trigger division by zero at runtime. */ if (!d1->isconst()) guard(false, lir->ins_eq0(d1), exit); result = lir->ins1(v = LIR_mod, lir->ins2(LIR_div, d0, d1)); /* * If the result is not 0, it is always within the integer domain. */ LIns* branch = lir->insBranch(LIR_jf, lir->ins_eq0(result), NULL); /* * If the result is zero, we must exit if the lhs is negative since * the result is -0 in this case, which is not in the integer domain. */ guard(false, lir->ins2i(LIR_lt, result, 0), exit); branch->setTarget(lir->ins0(LIR_label)); break; } #endif default: v = (LOpcode)((int)v & ~LIR64); result = lir->ins2(v, d0, d1); /* * If the operands guarantee that the result will be an integer (i.e. * z = x + y with 0 <= (x|y) <= 0xffff guarantees z <= fffe0001), we * don't have to guard against an overflow. Otherwise we emit a guard * that will inform the oracle and cause a non-demoted trace to be * attached that uses floating-point math for this operation. */ if (!result->isconst() && (!overflowSafe(v, d0) || !overflowSafe(v, d1))) { exit = snapshot(OVERFLOW_EXIT); guard(false, lir->ins1(LIR_ov, result), exit); if (v == LIR_mul) // make sure we don't lose a -0 guard(false, lir->ins_eq0(result), exit); } break; } JS_ASSERT_IF(d0->isconst() && d1->isconst(), result->isconst() && result->imm32() == jsint(r)); return lir->ins1(LIR_i2f, result); } LIns* TraceRecorder::f2i(LIns* f) { return lir->insCall(&js_DoubleToInt32_ci, &f); } JS_REQUIRES_STACK LIns* TraceRecorder::makeNumberInt32(LIns* f) { JS_ASSERT(f->isQuad()); LIns* x; if (!isPromote(f)) { x = f2i(f); guard(true, lir->ins2(LIR_feq, f, lir->ins1(LIR_i2f, x)), MISMATCH_EXIT); } else { x = ::demote(lir, f); } return x; } JS_REQUIRES_STACK LIns* TraceRecorder::stringify(jsval& v) { LIns* v_ins = get(&v); if (JSVAL_IS_STRING(v)) return v_ins; LIns* args[] = { v_ins, cx_ins }; const CallInfo* ci; if (JSVAL_IS_NUMBER(v)) { ci = &js_NumberToString_ci; } else if (JSVAL_TAG(v) == JSVAL_BOOLEAN) { ci = &js_BooleanOrUndefinedToString_ci; } else { /* * Callers must deal with non-primitive (non-null object) values by * calling an imacro. We don't try to guess about which imacro, with * what valueOf hint, here. */ JS_ASSERT(JSVAL_IS_NULL(v)); return INS_CONSTPTR(ATOM_TO_STRING(cx->runtime->atomState.nullAtom)); } v_ins = lir->insCall(ci, args); guard(false, lir->ins_eq0(v_ins), OOM_EXIT); return v_ins; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::call_imacro(jsbytecode* imacro) { JSStackFrame* fp = cx->fp; JSFrameRegs* regs = fp->regs; // We can't nest imacros. if (fp->imacpc) return JSRS_STOP; fp->imacpc = regs->pc; regs->pc = imacro; atoms = COMMON_ATOMS_START(&cx->runtime->atomState); return JSRS_IMACRO; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::ifop() { jsval& v = stackval(-1); LIns* v_ins = get(&v); bool cond; LIns* x; if (JSVAL_IS_NULL(v)) { cond = false; x = lir->insImm(0); } else if (!JSVAL_IS_PRIMITIVE(v)) { cond = true; x = lir->insImm(1); } else if (JSVAL_TAG(v) == JSVAL_BOOLEAN) { /* Test for boolean is true, negate later if we are testing for false. */ cond = JSVAL_TO_PSEUDO_BOOLEAN(v) == JS_TRUE; x = lir->ins2i(LIR_eq, v_ins, 1); } else if (isNumber(v)) { jsdouble d = asNumber(v); cond = !JSDOUBLE_IS_NaN(d) && d; x = lir->ins2(LIR_and, lir->ins2(LIR_feq, v_ins, v_ins), lir->ins_eq0(lir->ins2(LIR_feq, v_ins, lir->insImmq(0)))); } else if (JSVAL_IS_STRING(v)) { cond = JSVAL_TO_STRING(v)->length() != 0; x = lir->ins2(LIR_piand, lir->insLoad(LIR_ldp, v_ins, (int)offsetof(JSString, mLength)), INS_CONSTWORD(JSString::LENGTH_MASK)); } else { JS_NOT_REACHED("ifop"); return JSRS_STOP; } jsbytecode* pc = cx->fp->regs->pc; emitIf(pc, cond, x); return checkTraceEnd(pc); } #ifdef NANOJIT_IA32 /* Record LIR for a tableswitch or tableswitchx op. We record LIR only the "first" time we hit the op. Later, when we start traces after exiting that trace, we just patch. */ JS_REQUIRES_STACK LIns* TraceRecorder::tableswitch() { jsval& v = stackval(-1); if (!isNumber(v)) return NULL; /* no need to guard if condition is constant */ LIns* v_ins = f2i(get(&v)); if (v_ins->isconst() || v_ins->isconstq()) return NULL; jsbytecode* pc = cx->fp->regs->pc; /* Starting a new trace after exiting a trace via switch. */ if (anchor && (anchor->exitType == CASE_EXIT || anchor->exitType == DEFAULT_EXIT) && fragment->ip == pc) { return NULL; } /* Decode jsop. */ jsint low, high; if (*pc == JSOP_TABLESWITCH) { pc += JUMP_OFFSET_LEN; low = GET_JUMP_OFFSET(pc); pc += JUMP_OFFSET_LEN; high = GET_JUMP_OFFSET(pc); } else { pc += JUMPX_OFFSET_LEN; low = GET_JUMPX_OFFSET(pc); pc += JUMPX_OFFSET_LEN; high = GET_JUMPX_OFFSET(pc); } /* Really large tables won't fit in a page. This is a conservative check. If it matters in practice we need to go off-page. */ if ((high + 1 - low) * sizeof(intptr_t*) + 128 > (unsigned) LARGEST_UNDERRUN_PROT) { // This throws away the return value of switchop but it seems // ok because switchop always returns true. (void) switchop(); return NULL; } /* Generate switch LIR. */ LIns* si_ins = lir_buf_writer->insSkip(sizeof(SwitchInfo)); SwitchInfo* si = (SwitchInfo*) si_ins->payload(); si->count = high + 1 - low; si->table = 0; si->index = (uint32) -1; LIns* diff = lir->ins2(LIR_sub, v_ins, lir->insImm(low)); LIns* cmp = lir->ins2(LIR_ult, diff, lir->insImm(si->count)); lir->insGuard(LIR_xf, cmp, createGuardRecord(snapshot(DEFAULT_EXIT))); lir->insStorei(diff, lir->insImmPtr(&si->index), 0); VMSideExit* exit = snapshot(CASE_EXIT); exit->switchInfo = si; return lir->insGuard(LIR_xtbl, diff, createGuardRecord(exit)); } #endif JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::switchop() { jsval& v = stackval(-1); LIns* v_ins = get(&v); /* no need to guard if condition is constant */ if (v_ins->isconst() || v_ins->isconstq()) return JSRS_CONTINUE; if (isNumber(v)) { jsdouble d = asNumber(v); guard(true, addName(lir->ins2(LIR_feq, v_ins, lir->insImmf(d)), "guard(switch on numeric)"), BRANCH_EXIT); } else if (JSVAL_IS_STRING(v)) { LIns* args[] = { v_ins, INS_CONSTPTR(JSVAL_TO_STRING(v)) }; guard(true, addName(lir->ins_eq0(lir->ins_eq0(lir->insCall(&js_EqualStrings_ci, args))), "guard(switch on string)"), BRANCH_EXIT); } else if (JSVAL_TAG(v) == JSVAL_BOOLEAN) { guard(true, addName(lir->ins2(LIR_eq, v_ins, lir->insImm(JSVAL_TO_PUBLIC_PSEUDO_BOOLEAN(v))), "guard(switch on boolean)"), BRANCH_EXIT); } else { ABORT_TRACE("switch on object or null"); } return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::inc(jsval& v, jsint incr, bool pre) { LIns* v_ins = get(&v); CHECK_STATUS(inc(v, v_ins, incr, pre)); set(&v, v_ins); return JSRS_CONTINUE; } /* * On exit, v_ins is the incremented unboxed value, and the appropriate * value (pre- or post-increment as described by pre) is stacked. */ JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::inc(jsval& v, LIns*& v_ins, jsint incr, bool pre) { if (!isNumber(v)) ABORT_TRACE("can only inc numbers"); LIns* v_after = alu(LIR_fadd, asNumber(v), incr, v_ins, lir->insImmf(incr)); const JSCodeSpec& cs = js_CodeSpec[*cx->fp->regs->pc]; JS_ASSERT(cs.ndefs == 1); stack(-cs.nuses, pre ? v_after : v_ins); v_ins = v_after; return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::incProp(jsint incr, bool pre) { jsval& l = stackval(-1); if (JSVAL_IS_PRIMITIVE(l)) ABORT_TRACE("incProp on primitive"); JSObject* obj = JSVAL_TO_OBJECT(l); LIns* obj_ins = get(&l); uint32 slot; LIns* v_ins; CHECK_STATUS(prop(obj, obj_ins, slot, v_ins)); if (slot == SPROP_INVALID_SLOT) ABORT_TRACE("incProp on invalid slot"); jsval& v = STOBJ_GET_SLOT(obj, slot); CHECK_STATUS(inc(v, v_ins, incr, pre)); box_jsval(v, v_ins); LIns* dslots_ins = NULL; stobj_set_slot(obj_ins, slot, dslots_ins, v_ins); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::incElem(jsint incr, bool pre) { jsval& r = stackval(-1); jsval& l = stackval(-2); jsval* vp; LIns* v_ins; LIns* addr_ins; if (!JSVAL_IS_OBJECT(l) || !JSVAL_IS_INT(r) || !guardDenseArray(JSVAL_TO_OBJECT(l), get(&l))) { return JSRS_STOP; } CHECK_STATUS(denseArrayElement(l, r, vp, v_ins, addr_ins)); if (!addr_ins) // if we read a hole, abort return JSRS_STOP; CHECK_STATUS(inc(*vp, v_ins, incr, pre)); box_jsval(*vp, v_ins); lir->insStorei(v_ins, addr_ins, 0); return JSRS_CONTINUE; } static bool evalCmp(LOpcode op, double result) { bool cond; switch (op) { case LIR_feq: cond = (result == 0); break; case LIR_flt: cond = result < 0; break; case LIR_fgt: cond = result > 0; break; case LIR_fle: cond = result <= 0; break; case LIR_fge: cond = result >= 0; break; default: JS_NOT_REACHED("unexpected comparison op"); return false; } return cond; } static bool evalCmp(LOpcode op, double l, double r) { return evalCmp(op, l - r); } static bool evalCmp(LOpcode op, JSString* l, JSString* r) { if (op == LIR_feq) return js_EqualStrings(l, r); return evalCmp(op, js_CompareStrings(l, r)); } JS_REQUIRES_STACK void TraceRecorder::strictEquality(bool equal, bool cmpCase) { jsval& r = stackval(-1); jsval& l = stackval(-2); LIns* l_ins = get(&l); LIns* r_ins = get(&r); LIns* x; bool cond; JSTraceType ltag = getPromotedType(l); if (ltag != getPromotedType(r)) { cond = !equal; x = lir->insImm(cond); } else if (ltag == TT_STRING) { LIns* args[] = { r_ins, l_ins }; x = lir->ins2i(LIR_eq, lir->insCall(&js_EqualStrings_ci, args), equal); cond = js_EqualStrings(JSVAL_TO_STRING(l), JSVAL_TO_STRING(r)); } else { LOpcode op = (ltag != TT_DOUBLE) ? LIR_eq : LIR_feq; x = lir->ins2(op, l_ins, r_ins); if (!equal) x = lir->ins_eq0(x); cond = (ltag == TT_DOUBLE) ? asNumber(l) == asNumber(r) : l == r; } cond = (cond == equal); if (cmpCase) { /* Only guard if the same path may not always be taken. */ if (!x->isconst()) guard(cond, x, BRANCH_EXIT); return; } set(&l, x); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::equality(bool negate, bool tryBranchAfterCond) { jsval& rval = stackval(-1); jsval& lval = stackval(-2); LIns* l_ins = get(&lval); LIns* r_ins = get(&rval); return equalityHelper(lval, rval, l_ins, r_ins, negate, tryBranchAfterCond, lval); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::equalityHelper(jsval l, jsval r, LIns* l_ins, LIns* r_ins, bool negate, bool tryBranchAfterCond, jsval& rval) { bool fp = false; bool cond; LIns* args[] = { NULL, NULL }; /* * The if chain below closely mirrors that found in 11.9.3, in general * deviating from that ordering of ifs only to account for SpiderMonkey's * conflation of booleans and undefined and for the possibility of * confusing objects and null. Note carefully the spec-mandated recursion * in the final else clause, which terminates because Number == T recurs * only if T is Object, but that must recur again to convert Object to * primitive, and ToPrimitive throws if the object cannot be converted to * a primitive value (which would terminate recursion). */ if (getPromotedType(l) == getPromotedType(r)) { if (JSVAL_TAG(l) == JSVAL_OBJECT || JSVAL_TAG(l) == JSVAL_BOOLEAN) { cond = (l == r); } else if (JSVAL_IS_STRING(l)) { args[0] = r_ins, args[1] = l_ins; l_ins = lir->insCall(&js_EqualStrings_ci, args); r_ins = lir->insImm(1); cond = js_EqualStrings(JSVAL_TO_STRING(l), JSVAL_TO_STRING(r)); } else { JS_ASSERT(isNumber(l) && isNumber(r)); cond = (asNumber(l) == asNumber(r)); fp = true; } } else if (JSVAL_IS_NULL(l) && JSVAL_TAG(r) == JSVAL_BOOLEAN) { l_ins = lir->insImm(JSVAL_TO_PSEUDO_BOOLEAN(JSVAL_VOID)); cond = (r == JSVAL_VOID); } else if (JSVAL_TAG(l) == JSVAL_BOOLEAN && JSVAL_IS_NULL(r)) { r_ins = lir->insImm(JSVAL_TO_PSEUDO_BOOLEAN(JSVAL_VOID)); cond = (l == JSVAL_VOID); } else if (isNumber(l) && JSVAL_IS_STRING(r)) { args[0] = r_ins, args[1] = cx_ins; r_ins = lir->insCall(&js_StringToNumber_ci, args); cond = (asNumber(l) == js_StringToNumber(cx, JSVAL_TO_STRING(r))); fp = true; } else if (JSVAL_IS_STRING(l) && isNumber(r)) { args[0] = l_ins, args[1] = cx_ins; l_ins = lir->insCall(&js_StringToNumber_ci, args); cond = (js_StringToNumber(cx, JSVAL_TO_STRING(l)) == asNumber(r)); fp = true; } else { if (JSVAL_TAG(l) == JSVAL_BOOLEAN) { bool isVoid = JSVAL_IS_VOID(l); guard(isVoid, lir->ins2(LIR_eq, l_ins, INS_CONST(JSVAL_TO_PSEUDO_BOOLEAN(JSVAL_VOID))), BRANCH_EXIT); if (!isVoid) { args[0] = l_ins, args[1] = cx_ins; l_ins = lir->insCall(&js_BooleanOrUndefinedToNumber_ci, args); l = (l == JSVAL_VOID) ? DOUBLE_TO_JSVAL(cx->runtime->jsNaN) : INT_TO_JSVAL(l == JSVAL_TRUE); return equalityHelper(l, r, l_ins, r_ins, negate, tryBranchAfterCond, rval); } } else if (JSVAL_TAG(r) == JSVAL_BOOLEAN) { bool isVoid = JSVAL_IS_VOID(r); guard(isVoid, lir->ins2(LIR_eq, r_ins, INS_CONST(JSVAL_TO_PSEUDO_BOOLEAN(JSVAL_VOID))), BRANCH_EXIT); if (!isVoid) { args[0] = r_ins, args[1] = cx_ins; r_ins = lir->insCall(&js_BooleanOrUndefinedToNumber_ci, args); r = (r == JSVAL_VOID) ? DOUBLE_TO_JSVAL(cx->runtime->jsNaN) : INT_TO_JSVAL(r == JSVAL_TRUE); return equalityHelper(l, r, l_ins, r_ins, negate, tryBranchAfterCond, rval); } } else { if ((JSVAL_IS_STRING(l) || isNumber(l)) && !JSVAL_IS_PRIMITIVE(r)) { ABORT_IF_XML(r); return call_imacro(equality_imacros.any_obj); } if (!JSVAL_IS_PRIMITIVE(l) && (JSVAL_IS_STRING(r) || isNumber(r))) { ABORT_IF_XML(l); return call_imacro(equality_imacros.obj_any); } } l_ins = lir->insImm(0); r_ins = lir->insImm(1); cond = false; } /* If the operands aren't numbers, compare them as integers. */ LOpcode op = fp ? LIR_feq : LIR_eq; LIns* x = lir->ins2(op, l_ins, r_ins); if (negate) { x = lir->ins_eq0(x); cond = !cond; } jsbytecode* pc = cx->fp->regs->pc; /* * Don't guard if the same path is always taken. If it isn't, we have to * fuse comparisons and the following branch, because the interpreter does * that. */ if (tryBranchAfterCond) fuseIf(pc + 1, cond, x); /* * There is no need to write out the result of this comparison if the trace * ends on this operation. */ if (pc[1] == JSOP_IFNE || pc[1] == JSOP_IFEQ) CHECK_STATUS(checkTraceEnd(pc + 1)); /* * We update the stack after the guard. This is safe since the guard bails * out at the comparison and the interpreter will therefore re-execute the * comparison. This way the value of the condition doesn't have to be * calculated and saved on the stack in most cases. */ set(&rval, x); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::relational(LOpcode op, bool tryBranchAfterCond) { jsval& r = stackval(-1); jsval& l = stackval(-2); LIns* x = NULL; bool cond; LIns* l_ins = get(&l); LIns* r_ins = get(&r); bool fp = false; jsdouble lnum, rnum; /* * 11.8.5 if either argument is an object with a function-valued valueOf * property; if both arguments are objects with non-function-valued valueOf * properties, abort. */ if (!JSVAL_IS_PRIMITIVE(l)) { ABORT_IF_XML(l); if (!JSVAL_IS_PRIMITIVE(r)) { ABORT_IF_XML(r); return call_imacro(binary_imacros.obj_obj); } return call_imacro(binary_imacros.obj_any); } if (!JSVAL_IS_PRIMITIVE(r)) { ABORT_IF_XML(r); return call_imacro(binary_imacros.any_obj); } /* 11.8.5 steps 3, 16-21. */ if (JSVAL_IS_STRING(l) && JSVAL_IS_STRING(r)) { LIns* args[] = { r_ins, l_ins }; l_ins = lir->insCall(&js_CompareStrings_ci, args); r_ins = lir->insImm(0); cond = evalCmp(op, JSVAL_TO_STRING(l), JSVAL_TO_STRING(r)); goto do_comparison; } /* 11.8.5 steps 4-5. */ if (!JSVAL_IS_NUMBER(l)) { LIns* args[] = { l_ins, cx_ins }; switch (JSVAL_TAG(l)) { case JSVAL_BOOLEAN: l_ins = lir->insCall(&js_BooleanOrUndefinedToNumber_ci, args); break; case JSVAL_STRING: l_ins = lir->insCall(&js_StringToNumber_ci, args); break; case JSVAL_OBJECT: if (JSVAL_IS_NULL(l)) { l_ins = lir->insImmf(0.0); break; } // FALL THROUGH case JSVAL_INT: case JSVAL_DOUBLE: default: JS_NOT_REACHED("JSVAL_IS_NUMBER if int/double, objects should " "have been handled at start of method"); ABORT_TRACE("safety belt"); } } if (!JSVAL_IS_NUMBER(r)) { LIns* args[] = { r_ins, cx_ins }; switch (JSVAL_TAG(r)) { case JSVAL_BOOLEAN: r_ins = lir->insCall(&js_BooleanOrUndefinedToNumber_ci, args); break; case JSVAL_STRING: r_ins = lir->insCall(&js_StringToNumber_ci, args); break; case JSVAL_OBJECT: if (JSVAL_IS_NULL(r)) { r_ins = lir->insImmf(0.0); break; } // FALL THROUGH case JSVAL_INT: case JSVAL_DOUBLE: default: JS_NOT_REACHED("JSVAL_IS_NUMBER if int/double, objects should " "have been handled at start of method"); ABORT_TRACE("safety belt"); } } { jsval tmp = JSVAL_NULL; JSAutoTempValueRooter tvr(cx, 1, &tmp); tmp = l; lnum = js_ValueToNumber(cx, &tmp); tmp = r; rnum = js_ValueToNumber(cx, &tmp); } cond = evalCmp(op, lnum, rnum); fp = true; /* 11.8.5 steps 6-15. */ do_comparison: /* If the result is not a number or it's not a quad, we must use an integer compare. */ if (!fp) { JS_ASSERT(op >= LIR_feq && op <= LIR_fge); op = LOpcode(op + (LIR_eq - LIR_feq)); } x = lir->ins2(op, l_ins, r_ins); jsbytecode* pc = cx->fp->regs->pc; /* * Don't guard if the same path is always taken. If it isn't, we have to * fuse comparisons and the following branch, because the interpreter does * that. */ if (tryBranchAfterCond) fuseIf(pc + 1, cond, x); /* * There is no need to write out the result of this comparison if the trace * ends on this operation. */ if (pc[1] == JSOP_IFNE || pc[1] == JSOP_IFEQ) CHECK_STATUS(checkTraceEnd(pc + 1)); /* * We update the stack after the guard. This is safe since the guard bails * out at the comparison and the interpreter will therefore re-execute the * comparison. This way the value of the condition doesn't have to be * calculated and saved on the stack in most cases. */ set(&l, x); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::unary(LOpcode op) { jsval& v = stackval(-1); bool intop = !(op & LIR64); if (isNumber(v)) { LIns* a = get(&v); if (intop) a = f2i(a); a = lir->ins1(op, a); if (intop) a = lir->ins1(LIR_i2f, a); set(&v, a); return JSRS_CONTINUE; } return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::binary(LOpcode op) { jsval& r = stackval(-1); jsval& l = stackval(-2); if (!JSVAL_IS_PRIMITIVE(l)) { ABORT_IF_XML(l); if (!JSVAL_IS_PRIMITIVE(r)) { ABORT_IF_XML(r); return call_imacro(binary_imacros.obj_obj); } return call_imacro(binary_imacros.obj_any); } if (!JSVAL_IS_PRIMITIVE(r)) { ABORT_IF_XML(r); return call_imacro(binary_imacros.any_obj); } bool intop = !(op & LIR64); LIns* a = get(&l); LIns* b = get(&r); bool leftIsNumber = isNumber(l); jsdouble lnum = leftIsNumber ? asNumber(l) : 0; bool rightIsNumber = isNumber(r); jsdouble rnum = rightIsNumber ? asNumber(r) : 0; if ((op >= LIR_sub && op <= LIR_ush) || // sub, mul, (callh), or, xor, (not,) lsh, rsh, ush (op >= LIR_fsub && op <= LIR_fmod)) { // fsub, fmul, fdiv, fmod LIns* args[2]; if (JSVAL_IS_STRING(l)) { args[0] = a; args[1] = cx_ins; a = lir->insCall(&js_StringToNumber_ci, args); lnum = js_StringToNumber(cx, JSVAL_TO_STRING(l)); leftIsNumber = true; } if (JSVAL_IS_STRING(r)) { args[0] = b; args[1] = cx_ins; b = lir->insCall(&js_StringToNumber_ci, args); rnum = js_StringToNumber(cx, JSVAL_TO_STRING(r)); rightIsNumber = true; } } if (JSVAL_TAG(l) == JSVAL_BOOLEAN) { LIns* args[] = { a, cx_ins }; a = lir->insCall(&js_BooleanOrUndefinedToNumber_ci, args); lnum = js_BooleanOrUndefinedToNumber(cx, JSVAL_TO_PSEUDO_BOOLEAN(l)); leftIsNumber = true; } if (JSVAL_TAG(r) == JSVAL_BOOLEAN) { LIns* args[] = { b, cx_ins }; b = lir->insCall(&js_BooleanOrUndefinedToNumber_ci, args); rnum = js_BooleanOrUndefinedToNumber(cx, JSVAL_TO_PSEUDO_BOOLEAN(r)); rightIsNumber = true; } if (leftIsNumber && rightIsNumber) { if (intop) { LIns *args[] = { a }; a = lir->insCall(op == LIR_ush ? &js_DoubleToUint32_ci : &js_DoubleToInt32_ci, args); b = f2i(b); } a = alu(op, lnum, rnum, a, b); if (intop) a = lir->ins1(op == LIR_ush ? LIR_u2f : LIR_i2f, a); set(&l, a); return JSRS_CONTINUE; } return JSRS_STOP; } JS_STATIC_ASSERT(offsetof(JSObjectOps, objectMap) == 0); bool TraceRecorder::map_is_native(JSObjectMap* map, LIns* map_ins, LIns*& ops_ins, size_t op_offset) { JS_ASSERT(op_offset < sizeof(JSObjectOps)); JS_ASSERT(op_offset % sizeof(void *) == 0); #define OP(ops) (*(void **) ((uint8 *) (ops) + op_offset)) void* ptr = OP(map->ops); if (ptr != OP(&js_ObjectOps)) return false; #undef OP ops_ins = addName(lir->insLoad(LIR_ldp, map_ins, int(offsetof(JSObjectMap, ops))), "ops"); LIns* n = lir->insLoad(LIR_ldp, ops_ins, op_offset); guard(true, addName(lir->ins2(LIR_eq, n, INS_CONSTPTR(ptr)), "guard(native-map)"), BRANCH_EXIT); return true; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::test_property_cache(JSObject* obj, LIns* obj_ins, JSObject*& obj2, jsuword& pcval) { jsbytecode* pc = cx->fp->regs->pc; JS_ASSERT(*pc != JSOP_INITPROP && *pc != JSOP_SETNAME && *pc != JSOP_SETPROP); // Mimic the interpreter's special case for dense arrays by skipping up one // hop along the proto chain when accessing a named (not indexed) property, // typically to find Array.prototype methods. JSObject* aobj = obj; if (OBJ_IS_DENSE_ARRAY(cx, obj)) { guardDenseArray(obj, obj_ins, BRANCH_EXIT); aobj = OBJ_GET_PROTO(cx, obj); obj_ins = stobj_get_fslot(obj_ins, JSSLOT_PROTO); } LIns* map_ins = lir->insLoad(LIR_ldp, obj_ins, (int)offsetof(JSObject, map)); LIns* ops_ins; // Interpreter calls to PROPERTY_CACHE_TEST guard on native object ops // which is required to use native objects (those whose maps are scopes), // or even more narrow conditions required because the cache miss case // will call a particular object-op (js_GetProperty, js_SetProperty). // // We parameterize using offsetof and guard on match against the hook at // the given offset in js_ObjectOps. TraceRecorder::record_JSOP_SETPROP // guards the js_SetProperty case. uint32 format = js_CodeSpec[*pc].format; uint32 mode = JOF_MODE(format); // No need to guard native-ness of global object. JS_ASSERT(OBJ_IS_NATIVE(globalObj)); if (aobj != globalObj) { size_t op_offset = offsetof(JSObjectOps, objectMap); if (mode == JOF_PROP || mode == JOF_VARPROP) { JS_ASSERT(!(format & JOF_SET)); op_offset = offsetof(JSObjectOps, getProperty); } else { JS_ASSERT(mode == JOF_NAME); } if (!map_is_native(aobj->map, map_ins, ops_ins, op_offset)) ABORT_TRACE("non-native map"); } JSAtom* atom; JSPropCacheEntry* entry; PROPERTY_CACHE_TEST(cx, pc, aobj, obj2, entry, atom); if (!atom) { // Null atom means that obj2 is locked and must now be unlocked. JS_UNLOCK_OBJ(cx, obj2); } else { // Miss: pre-fill the cache for the interpreter, as well as for our needs. jsid id = ATOM_TO_JSID(atom); JSProperty* prop; if (JOF_OPMODE(*pc) == JOF_NAME) { JS_ASSERT(aobj == obj); entry = js_FindPropertyHelper(cx, id, true, &obj, &obj2, &prop); if (!entry) ABORT_TRACE_ERROR("error in js_FindPropertyHelper"); if (entry == JS_NO_PROP_CACHE_FILL) ABORT_TRACE("cannot cache name"); } else { int protoIndex = js_LookupPropertyWithFlags(cx, aobj, id, cx->resolveFlags, &obj2, &prop); if (protoIndex < 0) ABORT_TRACE_ERROR("error in js_LookupPropertyWithFlags"); if (prop) { if (!OBJ_IS_NATIVE(obj2)) { OBJ_DROP_PROPERTY(cx, obj2, prop); ABORT_TRACE("property found on non-native object"); } entry = js_FillPropertyCache(cx, aobj, 0, protoIndex, obj2, (JSScopeProperty*) prop, false); JS_ASSERT(entry); if (entry == JS_NO_PROP_CACHE_FILL) entry = NULL; } } if (!prop) { // Propagate obj from js_FindPropertyHelper to record_JSOP_BINDNAME // via our obj2 out-parameter. If we are recording JSOP_SETNAME and // the global it's assigning does not yet exist, create it. obj2 = obj; // Use PCVAL_NULL to return "no such property" to our caller. pcval = PCVAL_NULL; return JSRS_CONTINUE; } OBJ_DROP_PROPERTY(cx, obj2, prop); if (!entry) ABORT_TRACE("failed to fill property cache"); } if (wasDeepAborted()) ABORT_TRACE("deep abort from property lookup"); #ifdef JS_THREADSAFE // There's a potential race in any JS_THREADSAFE embedding that's nuts // enough to share mutable objects on the scope or proto chain, but we // don't care about such insane embeddings. Anyway, the (scope, proto) // entry->vcap coordinates must reach obj2 from aobj at this point. JS_ASSERT(cx->requestDepth); #endif // Emit guard(s), common code for both hit and miss cases. // Check for first-level cache hit and guard on kshape if possible. // Otherwise guard on key object exact match. if (PCVCAP_TAG(entry->vcap) <= 1) { if (aobj != globalObj) { LIns* shape_ins = addName(lir->insLoad(LIR_ld, map_ins, offsetof(JSScope, shape)), "shape"); guard(true, addName(lir->ins2i(LIR_eq, shape_ins, entry->kshape), "guard(kshape)(test_property_cache)"), BRANCH_EXIT); } } else { #ifdef DEBUG JSOp op = js_GetOpcode(cx, cx->fp->script, pc); JSAtom *pcatom; if (op == JSOP_LENGTH) { pcatom = cx->runtime->atomState.lengthAtom; } else { ptrdiff_t pcoff = (JOF_TYPE(js_CodeSpec[op].format) == JOF_SLOTATOM) ? SLOTNO_LEN : 0; GET_ATOM_FROM_BYTECODE(cx->fp->script, pc, pcoff, pcatom); } JS_ASSERT(entry->kpc == (jsbytecode *) pcatom); JS_ASSERT(entry->kshape == jsuword(aobj)); #endif if (aobj != globalObj && !obj_ins->isconstp()) { guard(true, addName(lir->ins2i(LIR_eq, obj_ins, entry->kshape), "guard(kobj)"), BRANCH_EXIT); } } // For any hit that goes up the scope and/or proto chains, we will need to // guard on the shape of the object containing the property. if (PCVCAP_TAG(entry->vcap) >= 1) { jsuword vcap = entry->vcap; uint32 vshape = PCVCAP_SHAPE(vcap); JS_ASSERT(OBJ_SHAPE(obj2) == vshape); LIns* obj2_ins; if (PCVCAP_TAG(entry->vcap) == 1) { // Duplicate the special case in PROPERTY_CACHE_TEST. obj2_ins = stobj_get_fslot(obj_ins, JSSLOT_PROTO); guard(false, lir->ins_eq0(obj2_ins), BRANCH_EXIT); } else { obj2_ins = INS_CONSTPTR(obj2); } map_ins = lir->insLoad(LIR_ldp, obj2_ins, (int)offsetof(JSObject, map)); if (!map_is_native(obj2->map, map_ins, ops_ins)) ABORT_TRACE("non-native map"); LIns* shape_ins = addName(lir->insLoad(LIR_ld, map_ins, offsetof(JSScope, shape)), "shape"); guard(true, addName(lir->ins2i(LIR_eq, shape_ins, vshape), "guard(vshape)(test_property_cache)"), BRANCH_EXIT); } pcval = entry->vword; return JSRS_CONTINUE; } void TraceRecorder::stobj_set_fslot(LIns *obj_ins, unsigned slot, LIns* v_ins, const char *name) { addName(lir->insStorei(v_ins, obj_ins, offsetof(JSObject, fslots) + slot * sizeof(jsval)), name); } void TraceRecorder::stobj_set_dslot(LIns *obj_ins, unsigned slot, LIns*& dslots_ins, LIns* v_ins, const char *name) { if (!dslots_ins) dslots_ins = lir->insLoad(LIR_ldp, obj_ins, offsetof(JSObject, dslots)); addName(lir->insStorei(v_ins, dslots_ins, slot * sizeof(jsval)), name); } void TraceRecorder::stobj_set_slot(LIns* obj_ins, unsigned slot, LIns*& dslots_ins, LIns* v_ins) { if (slot < JS_INITIAL_NSLOTS) { stobj_set_fslot(obj_ins, slot, v_ins, "set_slot(fslots)"); } else { stobj_set_dslot(obj_ins, slot - JS_INITIAL_NSLOTS, dslots_ins, v_ins, "set_slot(dslots)"); } } LIns* TraceRecorder::stobj_get_fslot(LIns* obj_ins, unsigned slot) { JS_ASSERT(slot < JS_INITIAL_NSLOTS); return lir->insLoad(LIR_ldp, obj_ins, offsetof(JSObject, fslots) + slot * sizeof(jsval)); } LIns* TraceRecorder::stobj_get_dslot(LIns* obj_ins, unsigned index, LIns*& dslots_ins) { if (!dslots_ins) dslots_ins = lir->insLoad(LIR_ldp, obj_ins, offsetof(JSObject, dslots)); return lir->insLoad(LIR_ldp, dslots_ins, index * sizeof(jsval)); } LIns* TraceRecorder::stobj_get_slot(LIns* obj_ins, unsigned slot, LIns*& dslots_ins) { if (slot < JS_INITIAL_NSLOTS) return stobj_get_fslot(obj_ins, slot); return stobj_get_dslot(obj_ins, slot - JS_INITIAL_NSLOTS, dslots_ins); } JSRecordingStatus TraceRecorder::native_set(LIns* obj_ins, JSScopeProperty* sprop, LIns*& dslots_ins, LIns* v_ins) { if (SPROP_HAS_STUB_SETTER(sprop) && sprop->slot != SPROP_INVALID_SLOT) { stobj_set_slot(obj_ins, sprop->slot, dslots_ins, v_ins); return JSRS_CONTINUE; } ABORT_TRACE("unallocated or non-stub sprop"); } JSRecordingStatus TraceRecorder::native_get(LIns* obj_ins, LIns* pobj_ins, JSScopeProperty* sprop, LIns*& dslots_ins, LIns*& v_ins) { if (!SPROP_HAS_STUB_GETTER(sprop)) return JSRS_STOP; if (sprop->slot != SPROP_INVALID_SLOT) v_ins = stobj_get_slot(pobj_ins, sprop->slot, dslots_ins); else v_ins = INS_CONST(JSVAL_TO_PSEUDO_BOOLEAN(JSVAL_VOID)); return JSRS_CONTINUE; } JS_REQUIRES_STACK void TraceRecorder::box_jsval(jsval v, LIns*& v_ins) { if (isNumber(v)) { LIns* args[] = { v_ins, cx_ins }; v_ins = lir->insCall(&js_BoxDouble_ci, args); guard(false, lir->ins2(LIR_eq, v_ins, INS_CONST(JSVAL_ERROR_COOKIE)), OOM_EXIT); return; } switch (JSVAL_TAG(v)) { case JSVAL_BOOLEAN: v_ins = lir->ins2i(LIR_pior, lir->ins2i(LIR_pilsh, v_ins, JSVAL_TAGBITS), JSVAL_BOOLEAN); return; case JSVAL_OBJECT: return; default: JS_ASSERT(JSVAL_TAG(v) == JSVAL_STRING); v_ins = lir->ins2(LIR_pior, v_ins, INS_CONST(JSVAL_STRING)); return; } } JS_REQUIRES_STACK void TraceRecorder::unbox_jsval(jsval v, LIns*& v_ins, VMSideExit* exit) { if (isNumber(v)) { // JSVAL_IS_NUMBER(v) guard(false, lir->ins_eq0(lir->ins2(LIR_pior, lir->ins2(LIR_piand, v_ins, INS_CONST(JSVAL_INT)), lir->ins2i(LIR_eq, lir->ins2(LIR_piand, v_ins, INS_CONST(JSVAL_TAGMASK)), JSVAL_DOUBLE))), exit); LIns* args[] = { v_ins }; v_ins = lir->insCall(&js_UnboxDouble_ci, args); return; } switch (JSVAL_TAG(v)) { case JSVAL_BOOLEAN: guard(true, lir->ins2i(LIR_eq, lir->ins2(LIR_piand, v_ins, INS_CONST(JSVAL_TAGMASK)), JSVAL_BOOLEAN), exit); v_ins = lir->ins2i(LIR_ush, v_ins, JSVAL_TAGBITS); return; case JSVAL_OBJECT: if (JSVAL_IS_NULL(v)) { // JSVAL_NULL maps to type TT_NULL, so insist that v_ins == 0 here. guard(true, lir->ins_eq0(v_ins), exit); } else { guard(false, lir->ins_eq0(v_ins), exit); guard(true, lir->ins2i(LIR_eq, lir->ins2(LIR_piand, v_ins, INS_CONSTWORD(JSVAL_TAGMASK)), JSVAL_OBJECT), exit); guard(HAS_FUNCTION_CLASS(JSVAL_TO_OBJECT(v)), lir->ins2(LIR_eq, lir->ins2(LIR_piand, lir->insLoad(LIR_ldp, v_ins, offsetof(JSObject, classword)), INS_CONSTWORD(~JSSLOT_CLASS_MASK_BITS)), INS_CONSTPTR(&js_FunctionClass)), exit); } return; default: JS_ASSERT(JSVAL_TAG(v) == JSVAL_STRING); guard(true, lir->ins2i(LIR_eq, lir->ins2(LIR_piand, v_ins, INS_CONST(JSVAL_TAGMASK)), JSVAL_STRING), exit); v_ins = lir->ins2(LIR_piand, v_ins, INS_CONST(~JSVAL_TAGMASK)); return; } } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::getThis(LIns*& this_ins) { /* * js_ComputeThisForFrame updates cx->fp->argv[-1], so sample it into 'original' first. */ jsval original = JSVAL_NULL; if (cx->fp->callee) { original = cx->fp->argv[-1]; if (!JSVAL_IS_PRIMITIVE(original) && guardClass(JSVAL_TO_OBJECT(original), get(&cx->fp->argv[-1]), &js_WithClass, snapshot(MISMATCH_EXIT))) { ABORT_TRACE("can't trace getThis on With object"); } } JSObject* thisObj = js_ComputeThisForFrame(cx, cx->fp); if (!thisObj) ABORT_TRACE_ERROR("js_ComputeThisForName failed"); /* * In global code, bake in the global object as 'this' object. */ if (!cx->fp->callee) { JS_ASSERT(callDepth == 0); this_ins = INS_CONSTPTR(thisObj); /* * We don't have argv[-1] in global code, so we don't update the tracker here. */ return JSRS_CONTINUE; } jsval& thisv = cx->fp->argv[-1]; JS_ASSERT(JSVAL_IS_OBJECT(thisv)); /* * Traces type-specialize between null and objects, so if we currently see a null * value in argv[-1], this trace will only match if we see null at runtime as well. * Bake in the global object as 'this' object, updating the tracker as well. We * can only detect this condition prior to calling js_ComputeThisForFrame, since it * updates the interpreter's copy of argv[-1]. */ JSClass* clasp = NULL;; if (JSVAL_IS_NULL(original) || (((clasp = STOBJ_GET_CLASS(JSVAL_TO_OBJECT(original))) == &js_CallClass) || (clasp == &js_BlockClass))) { if (clasp) guardClass(JSVAL_TO_OBJECT(original), get(&thisv), clasp, snapshot(BRANCH_EXIT)); JS_ASSERT(!JSVAL_IS_PRIMITIVE(thisv)); if (thisObj != globalObj) ABORT_TRACE("global object was wrapped while recording"); this_ins = INS_CONSTPTR(thisObj); set(&thisv, this_ins); return JSRS_CONTINUE; } this_ins = get(&thisv); /* * The only unwrapped object that needs to be wrapped that we can get here is the * global object obtained throught the scope chain. */ JSObject* obj = js_GetWrappedObject(cx, JSVAL_TO_OBJECT(thisv)); OBJ_TO_INNER_OBJECT(cx, obj); if (!obj) return JSRS_ERROR; JS_ASSERT(original == thisv || original == OBJECT_TO_JSVAL(obj)); this_ins = lir->ins_choose(lir->ins2(LIR_eq, this_ins, INS_CONSTPTR(obj)), INS_CONSTPTR(JSVAL_TO_OBJECT(thisv)), this_ins); return JSRS_CONTINUE; } LIns* TraceRecorder::getStringLength(LIns* str_ins) { LIns* len_ins = lir->insLoad(LIR_ldp, str_ins, (int)offsetof(JSString, mLength)); LIns* masked_len_ins = lir->ins2(LIR_piand, len_ins, INS_CONSTWORD(JSString::LENGTH_MASK)); return lir->ins_choose(lir->ins_eq0(lir->ins2(LIR_piand, len_ins, INS_CONSTWORD(JSString::DEPENDENT))), masked_len_ins, lir->ins_choose(lir->ins_eq0(lir->ins2(LIR_piand, len_ins, INS_CONSTWORD(JSString::PREFIX))), lir->ins2(LIR_piand, len_ins, INS_CONSTWORD(JSString::DEPENDENT_LENGTH_MASK)), masked_len_ins)); } JS_REQUIRES_STACK bool TraceRecorder::guardClass(JSObject* obj, LIns* obj_ins, JSClass* clasp, VMSideExit* exit) { bool cond = STOBJ_GET_CLASS(obj) == clasp; LIns* class_ins = lir->insLoad(LIR_ldp, obj_ins, offsetof(JSObject, classword)); class_ins = lir->ins2(LIR_piand, class_ins, lir->insImm(~JSSLOT_CLASS_MASK_BITS)); char namebuf[32]; JS_snprintf(namebuf, sizeof namebuf, "guard(class is %s)", clasp->name); guard(cond, addName(lir->ins2(LIR_eq, class_ins, INS_CONSTPTR(clasp)), namebuf), exit); return cond; } JS_REQUIRES_STACK bool TraceRecorder::guardDenseArray(JSObject* obj, LIns* obj_ins, ExitType exitType) { return guardClass(obj, obj_ins, &js_ArrayClass, snapshot(exitType)); } JS_REQUIRES_STACK bool TraceRecorder::guardHasPrototype(JSObject* obj, LIns* obj_ins, JSObject** pobj, LIns** pobj_ins, VMSideExit* exit) { *pobj = JSVAL_TO_OBJECT(obj->fslots[JSSLOT_PROTO]); *pobj_ins = stobj_get_fslot(obj_ins, JSSLOT_PROTO); bool cond = *pobj == NULL; guard(cond, addName(lir->ins_eq0(*pobj_ins), "guard(proto-not-null)"), exit); return !cond; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::guardPrototypeHasNoIndexedProperties(JSObject* obj, LIns* obj_ins, ExitType exitType) { /* * Guard that no object along the prototype chain has any indexed properties which * might become visible through holes in the array. */ VMSideExit* exit = snapshot(exitType); if (js_PrototypeHasIndexedProperties(cx, obj)) return JSRS_STOP; while (guardHasPrototype(obj, obj_ins, &obj, &obj_ins, exit)) { LIns* map_ins = lir->insLoad(LIR_ldp, obj_ins, (int)offsetof(JSObject, map)); LIns* ops_ins; if (!map_is_native(obj->map, map_ins, ops_ins)) ABORT_TRACE("non-native object involved along prototype chain"); LIns* shape_ins = addName(lir->insLoad(LIR_ld, map_ins, offsetof(JSScope, shape)), "shape"); guard(true, addName(lir->ins2i(LIR_eq, shape_ins, OBJ_SHAPE(obj)), "guard(shape)"), exit); } return JSRS_CONTINUE; } JSRecordingStatus TraceRecorder::guardNotGlobalObject(JSObject* obj, LIns* obj_ins) { if (obj == globalObj) ABORT_TRACE("reference aliases global object"); guard(false, lir->ins2(LIR_eq, obj_ins, INS_CONSTPTR(globalObj)), MISMATCH_EXIT); return JSRS_CONTINUE; } JS_REQUIRES_STACK void TraceRecorder::clearFrameSlotsFromCache() { /* Clear out all slots of this frame in the nativeFrameTracker. Different locations on the VM stack might map to different locations on the native stack depending on the number of arguments (i.e.) of the next call, so we have to make sure we map those in to the cache with the right offsets. */ JSStackFrame* fp = cx->fp; jsval* vp; jsval* vpstop; if (fp->callee) { vp = &fp->argv[-2]; vpstop = &fp->argv[argSlots(fp)]; while (vp < vpstop) nativeFrameTracker.set(vp++, (LIns*)0); } vp = &fp->slots[0]; vpstop = &fp->slots[fp->script->nslots]; while (vp < vpstop) nativeFrameTracker.set(vp++, (LIns*)0); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_EnterFrame() { JSStackFrame* fp = cx->fp; if (++callDepth >= MAX_CALLDEPTH) ABORT_TRACE("exceeded maximum call depth"); // FIXME: Allow and attempt to inline a single level of recursion until we compile // recursive calls as independent trees (459301). if (fp->script == fp->down->script && fp->down->down && fp->down->down->script == fp->script) ABORT_TRACE("recursive call"); debug_only_printf(LC_TMTracer, "EnterFrame %s, callDepth=%d\n", js_AtomToPrintableString(cx, cx->fp->fun->atom), callDepth); debug_only_stmt( if (js_LogController.lcbits & LC_TMRecorder) { js_Disassemble(cx, cx->fp->script, JS_TRUE, stdout); debug_only_print0(LC_TMTracer, "----\n"); } ) LIns* void_ins = INS_CONST(JSVAL_TO_PSEUDO_BOOLEAN(JSVAL_VOID)); jsval* vp = &fp->argv[fp->argc]; jsval* vpstop = vp + ptrdiff_t(fp->fun->nargs) - ptrdiff_t(fp->argc); while (vp < vpstop) { if (vp >= fp->down->regs->sp) nativeFrameTracker.set(vp, (LIns*)0); set(vp++, void_ins, true); } vp = &fp->slots[0]; vpstop = vp + fp->script->nfixed; while (vp < vpstop) set(vp++, void_ins, true); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_LeaveFrame() { debug_only_stmt( if (cx->fp->fun) debug_only_printf(LC_TMTracer, "LeaveFrame (back to %s), callDepth=%d\n", js_AtomToPrintableString(cx, cx->fp->fun->atom), callDepth); ); if (callDepth-- <= 0) ABORT_TRACE("returned out of a loop we started tracing"); // LeaveFrame gets called after the interpreter popped the frame and // stored rval, so cx->fp not cx->fp->down, and -1 not 0. atoms = FrameAtomBase(cx, cx->fp); set(&stackval(-1), rval_ins, true); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_PUSH() { stack(0, INS_CONST(JSVAL_TO_PSEUDO_BOOLEAN(JSVAL_VOID))); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_POPV() { jsval& rval = stackval(-1); LIns *rval_ins = get(&rval); box_jsval(rval, rval_ins); // Store it in cx->fp->rval. NB: Tricky dependencies. cx->fp is the right // frame because POPV appears only in global and eval code and we don't // trace JSOP_EVAL or leaving the frame where tracing started. LIns *fp_ins = lir->insLoad(LIR_ldp, cx_ins, offsetof(JSContext, fp)); lir->insStorei(rval_ins, fp_ins, offsetof(JSStackFrame, rval)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ENTERWITH() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_LEAVEWITH() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_RETURN() { /* A return from callDepth 0 terminates the current loop. */ if (callDepth == 0) { AUDIT(returnLoopExits); endLoop(traceMonitor); return JSRS_STOP; } /* If we inlined this function call, make the return value available to the caller code. */ jsval& rval = stackval(-1); JSStackFrame *fp = cx->fp; if ((cx->fp->flags & JSFRAME_CONSTRUCTING) && JSVAL_IS_PRIMITIVE(rval)) { JS_ASSERT(OBJECT_TO_JSVAL(fp->thisp) == fp->argv[-1]); rval_ins = get(&fp->argv[-1]); } else { rval_ins = get(&rval); } debug_only_printf(LC_TMTracer, "returning from %s\n", js_AtomToPrintableString(cx, cx->fp->fun->atom)); clearFrameSlotsFromCache(); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GOTO() { /* * If we hit a break, end the loop and generate an always taken loop exit guard. * For other downward gotos (like if/else) continue recording. */ jssrcnote* sn = js_GetSrcNote(cx->fp->script, cx->fp->regs->pc); if (sn && SN_TYPE(sn) == SRC_BREAK) { AUDIT(breakLoopExits); endLoop(traceMonitor); return JSRS_STOP; } return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_IFEQ() { trackCfgMerges(cx->fp->regs->pc); return ifop(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_IFNE() { return ifop(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ARGUMENTS() { #if 1 ABORT_TRACE("can't trace arguments yet"); #else LIns* args[] = { cx_ins }; LIns* a_ins = lir->insCall(&js_Arguments_ci, args); guard(false, lir->ins_eq0(a_ins), OOM_EXIT); stack(0, a_ins); return JSRS_CONTINUE; #endif } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DUP() { stack(0, get(&stackval(-1))); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DUP2() { stack(0, get(&stackval(-2))); stack(1, get(&stackval(-1))); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_SWAP() { jsval& l = stackval(-2); jsval& r = stackval(-1); LIns* l_ins = get(&l); LIns* r_ins = get(&r); set(&r, l_ins); set(&l, r_ins); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_PICK() { jsval* sp = cx->fp->regs->sp; jsint n = cx->fp->regs->pc[1]; JS_ASSERT(sp - (n+1) >= StackBase(cx->fp)); LIns* top = get(sp - (n+1)); for (jsint i = 0; i < n; ++i) set(sp - (n+1) + i, get(sp - n + i)); set(&sp[-1], top); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_SETCONST() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_BITOR() { return binary(LIR_or); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_BITXOR() { return binary(LIR_xor); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_BITAND() { return binary(LIR_and); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_EQ() { return equality(false, true); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_NE() { return equality(true, true); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_LT() { return relational(LIR_flt, true); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_LE() { return relational(LIR_fle, true); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GT() { return relational(LIR_fgt, true); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GE() { return relational(LIR_fge, true); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_LSH() { return binary(LIR_lsh); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_RSH() { return binary(LIR_rsh); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_URSH() { return binary(LIR_ush); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ADD() { jsval& r = stackval(-1); jsval& l = stackval(-2); if (!JSVAL_IS_PRIMITIVE(l)) { ABORT_IF_XML(l); if (!JSVAL_IS_PRIMITIVE(r)) { ABORT_IF_XML(r); return call_imacro(add_imacros.obj_obj); } return call_imacro(add_imacros.obj_any); } if (!JSVAL_IS_PRIMITIVE(r)) { ABORT_IF_XML(r); return call_imacro(add_imacros.any_obj); } if (JSVAL_IS_STRING(l) || JSVAL_IS_STRING(r)) { LIns* args[] = { stringify(r), stringify(l), cx_ins }; LIns* concat = lir->insCall(&js_ConcatStrings_ci, args); guard(false, lir->ins_eq0(concat), OOM_EXIT); set(&l, concat); return JSRS_CONTINUE; } return binary(LIR_fadd); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_SUB() { return binary(LIR_fsub); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_MUL() { return binary(LIR_fmul); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DIV() { return binary(LIR_fdiv); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_MOD() { return binary(LIR_fmod); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_NOT() { jsval& v = stackval(-1); if (JSVAL_TAG(v) == JSVAL_BOOLEAN) { set(&v, lir->ins_eq0(lir->ins2i(LIR_eq, get(&v), 1))); return JSRS_CONTINUE; } if (isNumber(v)) { LIns* v_ins = get(&v); set(&v, lir->ins2(LIR_or, lir->ins2(LIR_feq, v_ins, lir->insImmq(0)), lir->ins_eq0(lir->ins2(LIR_feq, v_ins, v_ins)))); return JSRS_CONTINUE; } if (JSVAL_TAG(v) == JSVAL_OBJECT) { set(&v, lir->ins_eq0(get(&v))); return JSRS_CONTINUE; } JS_ASSERT(JSVAL_IS_STRING(v)); set(&v, lir->ins_eq0(lir->ins2(LIR_piand, lir->insLoad(LIR_ldp, get(&v), (int)offsetof(JSString, mLength)), INS_CONSTWORD(JSString::LENGTH_MASK)))); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_BITNOT() { return unary(LIR_not); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_NEG() { jsval& v = stackval(-1); if (!JSVAL_IS_PRIMITIVE(v)) { ABORT_IF_XML(v); return call_imacro(unary_imacros.sign); } if (isNumber(v)) { LIns* a = get(&v); /* If we're a promoted integer, we have to watch out for 0s since -0 is a double. Only follow this path if we're not an integer that's 0 and we're not a double that's zero. */ if (!oracle.isInstructionUndemotable(cx->fp->regs->pc) && isPromoteInt(a) && (!JSVAL_IS_INT(v) || JSVAL_TO_INT(v) != 0) && (!JSVAL_IS_DOUBLE(v) || !JSDOUBLE_IS_NEGZERO(*JSVAL_TO_DOUBLE(v))) && -asNumber(v) == (int)-asNumber(v)) { a = lir->ins1(LIR_neg, ::demote(lir, a)); if (!a->isconst()) { VMSideExit* exit = snapshot(OVERFLOW_EXIT); guard(false, lir->ins1(LIR_ov, a), exit); guard(false, lir->ins2i(LIR_eq, a, 0), exit); } a = lir->ins1(LIR_i2f, a); } else { a = lir->ins1(LIR_fneg, a); } set(&v, a); return JSRS_CONTINUE; } if (JSVAL_IS_NULL(v)) { set(&v, lir->insImmf(-0.0)); return JSRS_CONTINUE; } JS_ASSERT(JSVAL_TAG(v) == JSVAL_STRING || JSVAL_TAG(v) == JSVAL_BOOLEAN); LIns* args[] = { get(&v), cx_ins }; set(&v, lir->ins1(LIR_fneg, lir->insCall(JSVAL_IS_STRING(v) ? &js_StringToNumber_ci : &js_BooleanOrUndefinedToNumber_ci, args))); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_POS() { jsval& v = stackval(-1); if (!JSVAL_IS_PRIMITIVE(v)) { ABORT_IF_XML(v); return call_imacro(unary_imacros.sign); } if (isNumber(v)) return JSRS_CONTINUE; if (JSVAL_IS_NULL(v)) { set(&v, lir->insImmq(0)); return JSRS_CONTINUE; } JS_ASSERT(JSVAL_TAG(v) == JSVAL_STRING || JSVAL_TAG(v) == JSVAL_BOOLEAN); LIns* args[] = { get(&v), cx_ins }; set(&v, lir->insCall(JSVAL_IS_STRING(v) ? &js_StringToNumber_ci : &js_BooleanOrUndefinedToNumber_ci, args)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_PRIMTOP() { // Either this opcode does nothing or we couldn't have traced here, because // we'd have thrown an exception -- so do nothing if we actually hit this. return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_OBJTOP() { jsval& v = stackval(-1); ABORT_IF_XML(v); return JSRS_CONTINUE; } JSBool js_Array(JSContext* cx, JSObject* obj, uintN argc, jsval* argv, jsval* rval); JSBool js_Object(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval); JSBool js_Date(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval); JSRecordingStatus TraceRecorder::getClassPrototype(JSObject* ctor, LIns*& proto_ins) { jsval pval; if (!OBJ_GET_PROPERTY(cx, ctor, ATOM_TO_JSID(cx->runtime->atomState.classPrototypeAtom), &pval)) { ABORT_TRACE_ERROR("error getting prototype from constructor"); } if (JSVAL_TAG(pval) != JSVAL_OBJECT) ABORT_TRACE("got primitive prototype from constructor"); #ifdef DEBUG JSBool ok, found; uintN attrs; ok = JS_GetPropertyAttributes(cx, ctor, js_class_prototype_str, &attrs, &found); JS_ASSERT(ok); JS_ASSERT(found); JS_ASSERT((~attrs & (JSPROP_READONLY | JSPROP_PERMANENT)) == 0); #endif proto_ins = INS_CONSTPTR(JSVAL_TO_OBJECT(pval)); return JSRS_CONTINUE; } JSRecordingStatus TraceRecorder::getClassPrototype(JSProtoKey key, LIns*& proto_ins) { JSObject* proto; if (!js_GetClassPrototype(cx, globalObj, INT_TO_JSID(key), &proto)) ABORT_TRACE_ERROR("error in js_GetClassPrototype"); proto_ins = INS_CONSTPTR(proto); return JSRS_CONTINUE; } #define IGNORE_NATIVE_CALL_COMPLETE_CALLBACK ((JSTraceableNative*)1) JSRecordingStatus TraceRecorder::newString(JSObject* ctor, uint32 argc, jsval* argv, jsval* rval) { JS_ASSERT(argc == 1); if (!JSVAL_IS_PRIMITIVE(argv[0])) { ABORT_IF_XML(argv[0]); return call_imacro(new_imacros.String); } LIns* proto_ins; CHECK_STATUS(getClassPrototype(ctor, proto_ins)); LIns* args[] = { stringify(argv[0]), proto_ins, cx_ins }; LIns* obj_ins = lir->insCall(&js_String_tn_ci, args); guard(false, lir->ins_eq0(obj_ins), OOM_EXIT); set(rval, obj_ins); pendingTraceableNative = IGNORE_NATIVE_CALL_COMPLETE_CALLBACK; return JSRS_CONTINUE; } JSRecordingStatus TraceRecorder::newArray(JSObject* ctor, uint32 argc, jsval* argv, jsval* rval) { LIns *proto_ins; CHECK_STATUS(getClassPrototype(ctor, proto_ins)); LIns *arr_ins; if (argc == 0 || (argc == 1 && JSVAL_IS_NUMBER(argv[0]))) { // arr_ins = js_NewEmptyArray(cx, Array.prototype) LIns *args[] = { proto_ins, cx_ins }; arr_ins = lir->insCall(&js_NewEmptyArray_ci, args); guard(false, lir->ins_eq0(arr_ins), OOM_EXIT); if (argc == 1) { // array_ins.fslots[JSSLOT_ARRAY_LENGTH] = length lir->insStorei(f2i(get(argv)), // FIXME: is this 64-bit safe? arr_ins, offsetof(JSObject, fslots) + JSSLOT_ARRAY_LENGTH * sizeof(jsval)); } } else { // arr_ins = js_NewUninitializedArray(cx, Array.prototype, argc) LIns *args[] = { INS_CONST(argc), proto_ins, cx_ins }; arr_ins = lir->insCall(&js_NewUninitializedArray_ci, args); guard(false, lir->ins_eq0(arr_ins), OOM_EXIT); // arr->dslots[i] = box_jsval(vp[i]); for i in 0..argc LIns *dslots_ins = NULL; for (uint32 i = 0; i < argc && !lirbuf->outOMem(); i++) { LIns *elt_ins = get(argv + i); box_jsval(argv[i], elt_ins); stobj_set_dslot(arr_ins, i, dslots_ins, elt_ins, "set_array_elt"); } if (argc > 0) stobj_set_fslot(arr_ins, JSSLOT_ARRAY_COUNT, INS_CONST(argc), "set_array_count"); } set(rval, arr_ins); pendingTraceableNative = IGNORE_NATIVE_CALL_COMPLETE_CALLBACK; return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::emitNativeCall(JSTraceableNative* known, uintN argc, LIns* args[]) { bool constructing = known->flags & JSTN_CONSTRUCTOR; if (JSTN_ERRTYPE(known) == FAIL_STATUS) { // This needs to capture the pre-call state of the stack. So do not set // pendingTraceableNative before taking this snapshot. JS_ASSERT(!pendingTraceableNative); // Take snapshot for deep LeaveTree and store it in cx->bailExit. // If we are calling a slow native, add information to the side exit // for SynthesizeSlowNativeFrame. VMSideExit* exit = snapshot(DEEP_BAIL_EXIT); JSObject* funobj = JSVAL_TO_OBJECT(stackval(0 - (2 + argc))); if (FUN_SLOW_NATIVE(GET_FUNCTION_PRIVATE(cx, funobj))) exit->setNativeCallee(funobj, constructing); lir->insStorei(INS_CONSTPTR(exit), cx_ins, offsetof(JSContext, bailExit)); // Tell nanojit not to discard or defer stack writes before this call. LIns* guardRec = createGuardRecord(exit); lir->insGuard(LIR_xbarrier, guardRec, guardRec); } LIns* res_ins = lir->insCall(known->builtin, args); rval_ins = res_ins; switch (JSTN_ERRTYPE(known)) { case FAIL_NULL: guard(false, lir->ins_eq0(res_ins), OOM_EXIT); break; case FAIL_NEG: res_ins = lir->ins1(LIR_i2f, res_ins); guard(false, lir->ins2(LIR_flt, res_ins, lir->insImmq(0)), OOM_EXIT); break; case FAIL_VOID: guard(false, lir->ins2i(LIR_eq, res_ins, JSVAL_TO_PSEUDO_BOOLEAN(JSVAL_VOID)), OOM_EXIT); break; case FAIL_COOKIE: guard(false, lir->ins2(LIR_eq, res_ins, INS_CONST(JSVAL_ERROR_COOKIE)), OOM_EXIT); break; default:; } set(&stackval(0 - (2 + argc)), res_ins); /* * The return value will be processed by NativeCallComplete since * we have to know the actual return value type for calls that return * jsval (like Array_p_pop). */ pendingTraceableNative = known; return JSRS_CONTINUE; } /* * Check whether we have a specialized implementation for this native invocation. */ JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::callTraceableNative(JSFunction* fun, uintN argc, bool constructing) { JSTraceableNative* known = FUN_TRCINFO(fun); JS_ASSERT(known && (JSFastNative)fun->u.n.native == known->native); JSStackFrame* fp = cx->fp; jsbytecode *pc = fp->regs->pc; jsval& fval = stackval(0 - (2 + argc)); jsval& tval = stackval(0 - (1 + argc)); LIns* this_ins = get(&tval); LIns* args[nanojit::MAXARGS]; do { if (((known->flags & JSTN_CONSTRUCTOR) != 0) != constructing) continue; uintN knownargc = strlen(known->argtypes); if (argc != knownargc) continue; intN prefixc = strlen(known->prefix); JS_ASSERT(prefixc <= 3); LIns** argp = &args[argc + prefixc - 1]; char argtype; #if defined DEBUG memset(args, 0xCD, sizeof(args)); #endif uintN i; for (i = prefixc; i--; ) { argtype = known->prefix[i]; if (argtype == 'C') { *argp = cx_ins; } else if (argtype == 'T') { /* this, as an object */ if (JSVAL_IS_PRIMITIVE(tval)) goto next_specialization; *argp = this_ins; } else if (argtype == 'S') { /* this, as a string */ if (!JSVAL_IS_STRING(tval)) goto next_specialization; *argp = this_ins; } else if (argtype == 'f') { *argp = INS_CONSTPTR(JSVAL_TO_OBJECT(fval)); } else if (argtype == 'p') { CHECK_STATUS(getClassPrototype(JSVAL_TO_OBJECT(fval), *argp)); } else if (argtype == 'R') { *argp = INS_CONSTPTR(cx->runtime); } else if (argtype == 'P') { // FIXME: Set pc to imacpc when recording JSOP_CALL inside the // JSOP_GETELEM imacro (bug 476559). if (*pc == JSOP_CALL && fp->imacpc && *fp->imacpc == JSOP_GETELEM) *argp = INS_CONSTPTR(fp->imacpc); else *argp = INS_CONSTPTR(pc); } else if (argtype == 'D') { /* this, as a number */ if (!isNumber(tval)) goto next_specialization; *argp = this_ins; } else { JS_NOT_REACHED("unknown prefix arg type"); } argp--; } for (i = knownargc; i--; ) { jsval& arg = stackval(0 - (i + 1)); *argp = get(&arg); argtype = known->argtypes[i]; if (argtype == 'd' || argtype == 'i') { if (!isNumber(arg)) goto next_specialization; if (argtype == 'i') *argp = f2i(*argp); } else if (argtype == 'o') { if (JSVAL_IS_PRIMITIVE(arg)) goto next_specialization; } else if (argtype == 's') { if (!JSVAL_IS_STRING(arg)) goto next_specialization; } else if (argtype == 'r') { if (!VALUE_IS_REGEXP(cx, arg)) goto next_specialization; } else if (argtype == 'f') { if (!VALUE_IS_FUNCTION(cx, arg)) goto next_specialization; } else if (argtype == 'v') { box_jsval(arg, *argp); } else { goto next_specialization; } argp--; } #if defined DEBUG JS_ASSERT(args[0] != (LIns *)0xcdcdcdcd); #endif return emitNativeCall(known, argc, args); next_specialization:; } while ((known++)->flags & JSTN_MORE); return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::callNative(uintN argc, JSOp mode) { LIns* args[5]; JS_ASSERT(mode == JSOP_CALL || mode == JSOP_NEW || mode == JSOP_APPLY); jsval* vp = &stackval(0 - (2 + argc)); JSObject* funobj = JSVAL_TO_OBJECT(vp[0]); JSFunction* fun = GET_FUNCTION_PRIVATE(cx, funobj); if (fun->flags & JSFUN_TRACEABLE) { JSRecordingStatus status; if ((status = callTraceableNative(fun, argc, mode == JSOP_NEW)) != JSRS_STOP) return status; } JSFastNative native = (JSFastNative)fun->u.n.native; if (native == js_fun_apply || native == js_fun_call) ABORT_TRACE("trying to call native apply or call"); // Allocate the vp vector and emit code to root it. uintN vplen = 2 + JS_MAX(argc, FUN_MINARGS(fun)) + fun->u.n.extra; if (!(fun->flags & JSFUN_FAST_NATIVE)) vplen++; // slow native return value slot lir->insStorei(INS_CONST(vplen), cx_ins, offsetof(JSContext, nativeVpLen)); LIns* invokevp_ins = lir->insAlloc(vplen * sizeof(jsval)); lir->insStorei(invokevp_ins, cx_ins, offsetof(JSContext, nativeVp)); // vp[0] is the callee. lir->insStorei(INS_CONSTWORD(OBJECT_TO_JSVAL(funobj)), invokevp_ins, 0); // Calculate |this|. LIns* this_ins; if (mode == JSOP_NEW) { JSClass* clasp = fun->u.n.clasp; JS_ASSERT(clasp != &js_SlowArrayClass); if (!clasp) clasp = &js_ObjectClass; JS_ASSERT(((jsuword) clasp & 3) == 0); // Abort on |new Function|. js_NewInstance would allocate a regular- // sized JSObject, not a Function-sized one. (The Function ctor would // deep-bail anyway but let's not go there.) if (clasp == &js_FunctionClass) ABORT_TRACE("new Function"); if (clasp->getObjectOps) ABORT_TRACE("new with non-native ops"); args[0] = INS_CONSTPTR(funobj); args[1] = INS_CONSTPTR(clasp); args[2] = cx_ins; newobj_ins = lir->insCall(&js_NewInstance_ci, args); guard(false, lir->ins_eq0(newobj_ins), OOM_EXIT); this_ins = newobj_ins; // boxing an object is a no-op } else if (JSFUN_BOUND_METHOD_TEST(fun->flags)) { this_ins = INS_CONSTWORD(OBJECT_TO_JSVAL(OBJ_GET_PARENT(cx, funobj))); } else { this_ins = get(&vp[1]); /* * For fast natives, 'null' or primitives are fine as as 'this' value. * For slow natives we have to ensure the object is substituted for the * appropriate global object or boxed object value. JSOP_NEW allocates its * own object so it's guaranteed to have a valid 'this' value. */ if (!(fun->flags & JSFUN_FAST_NATIVE)) { if (JSVAL_IS_NULL(vp[1])) { JSObject* thisObj = js_ComputeThis(cx, JS_FALSE, vp + 2); if (!thisObj) ABORT_TRACE_ERROR("error in js_ComputeGlobalThis"); this_ins = INS_CONSTPTR(thisObj); } else if (!JSVAL_IS_OBJECT(vp[1])) { ABORT_TRACE("slow native(primitive, args)"); } else { if (guardClass(JSVAL_TO_OBJECT(vp[1]), this_ins, &js_WithClass, snapshot(MISMATCH_EXIT))) ABORT_TRACE("can't trace slow native invocation on With object"); this_ins = lir->ins_choose(lir->ins_eq0(stobj_get_fslot(this_ins, JSSLOT_PARENT)), INS_CONSTPTR(globalObj), this_ins); } } box_jsval(vp[1], this_ins); } lir->insStorei(this_ins, invokevp_ins, 1 * sizeof(jsval)); // Populate argv. for (uintN n = 2; n < 2 + argc; n++) { LIns* i = get(&vp[n]); box_jsval(vp[n], i); lir->insStorei(i, invokevp_ins, n * sizeof(jsval)); // For a very long argument list we might run out of LIR space, so // check inside the loop. if (lirbuf->outOMem()) ABORT_TRACE("out of memory in argument list"); } // Populate extra slots, including the return value slot for a slow native. if (2 + argc < vplen) { LIns* undef_ins = INS_CONSTWORD(JSVAL_VOID); for (uintN n = 2 + argc; n < vplen; n++) { lir->insStorei(undef_ins, invokevp_ins, n * sizeof(jsval)); if (lirbuf->outOMem()) ABORT_TRACE("out of memory in extra slots"); } } // Set up arguments for the JSNative or JSFastNative. uint32 types; if (fun->flags & JSFUN_FAST_NATIVE) { if (mode == JSOP_NEW) ABORT_TRACE("untraceable fast native constructor"); native_rval_ins = invokevp_ins; args[0] = invokevp_ins; args[1] = lir->insImm(argc); args[2] = cx_ins; types = ARGSIZE_LO | ARGSIZE_LO << 2 | ARGSIZE_LO << 4 | ARGSIZE_LO << 6; } else { native_rval_ins = lir->ins2i(LIR_piadd, invokevp_ins, int32_t((vplen - 1) * sizeof(jsval))); args[0] = native_rval_ins; args[1] = lir->ins2i(LIR_piadd, invokevp_ins, int32_t(2 * sizeof(jsval))); args[2] = lir->insImm(argc); args[3] = this_ins; args[4] = cx_ins; types = ARGSIZE_LO | ARGSIZE_LO << 2 | ARGSIZE_LO << 4 | ARGSIZE_LO << 6 | ARGSIZE_LO << 8 | ARGSIZE_LO << 10; } // Generate CallInfo and a JSTraceableNative structure on the fly. Do not // use JSTN_UNBOX_AFTER for mode JSOP_NEW because record_NativeCallComplete // unboxes the result specially. CallInfo* ci = (CallInfo*) lir->insSkip(sizeof(struct CallInfo))->payload(); ci->_address = uintptr_t(fun->u.n.native); ci->_cse = ci->_fold = 0; ci->_abi = ABI_CDECL; ci->_argtypes = types; #ifdef DEBUG ci->_name = JS_GetFunctionName(fun); #endif // Generate a JSTraceableNative structure on the fly. generatedTraceableNative->builtin = ci; generatedTraceableNative->native = (JSFastNative)fun->u.n.native; generatedTraceableNative->flags = FAIL_STATUS | ((mode == JSOP_NEW) ? JSTN_CONSTRUCTOR : JSTN_UNBOX_AFTER); generatedTraceableNative->prefix = generatedTraceableNative->argtypes = NULL; // argc is the original argc here. It is used to calculate where to place // the return value. JSRecordingStatus status; if ((status = emitNativeCall(generatedTraceableNative, argc, args)) != JSRS_CONTINUE) return status; // Unroot the vp. lir->insStorei(INS_CONSTPTR(NULL), cx_ins, offsetof(JSContext, nativeVp)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::functionCall(uintN argc, JSOp mode) { jsval& fval = stackval(0 - (2 + argc)); JS_ASSERT(&fval >= StackBase(cx->fp)); if (!VALUE_IS_FUNCTION(cx, fval)) ABORT_TRACE("callee is not a function"); jsval& tval = stackval(0 - (1 + argc)); /* * If callee is not constant, it's a shapeless call and we have to guard * explicitly that we will get this callee again at runtime. */ if (!get(&fval)->isconst()) CHECK_STATUS(guardCallee(fval)); /* * Require that the callee be a function object, to avoid guarding on its * class here. We know if the callee and this were pushed by JSOP_CALLNAME * or JSOP_CALLPROP that callee is a *particular* function, since these hit * the property cache and guard on the object (this) in which the callee * was found. So it's sufficient to test here that the particular function * is interpreted, not guard on that condition. * * Bytecode sequences that push shapeless callees must guard on the callee * class being Function and the function being interpreted. */ JSFunction* fun = GET_FUNCTION_PRIVATE(cx, JSVAL_TO_OBJECT(fval)); if (FUN_INTERPRETED(fun)) { if (mode == JSOP_NEW) { LIns* args[] = { get(&fval), INS_CONSTPTR(&js_ObjectClass), cx_ins }; LIns* tv_ins = lir->insCall(&js_NewInstance_ci, args); guard(false, lir->ins_eq0(tv_ins), OOM_EXIT); set(&tval, tv_ins); } return interpretedFunctionCall(fval, fun, argc, mode == JSOP_NEW); } if (FUN_SLOW_NATIVE(fun)) { JSNative native = fun->u.n.native; jsval* argv = &tval + 1; if (native == js_Array) return newArray(JSVAL_TO_OBJECT(fval), argc, argv, &fval); if (native == js_String && argc == 1) { if (mode == JSOP_NEW) return newString(JSVAL_TO_OBJECT(fval), 1, argv, &fval); if (!JSVAL_IS_PRIMITIVE(argv[0])) { ABORT_IF_XML(argv[0]); return call_imacro(call_imacros.String); } set(&fval, stringify(argv[0])); pendingTraceableNative = IGNORE_NATIVE_CALL_COMPLETE_CALLBACK; return JSRS_CONTINUE; } } return callNative(argc, mode); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_NEW() { uintN argc = GET_ARGC(cx->fp->regs->pc); cx->fp->assertValidStackDepth(argc + 2); return functionCall(argc, JSOP_NEW); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DELNAME() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DELPROP() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DELELEM() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_TYPEOF() { jsval& r = stackval(-1); LIns* type; if (JSVAL_IS_STRING(r)) { type = INS_CONSTPTR(ATOM_TO_STRING(cx->runtime->atomState.typeAtoms[JSTYPE_STRING])); } else if (isNumber(r)) { type = INS_CONSTPTR(ATOM_TO_STRING(cx->runtime->atomState.typeAtoms[JSTYPE_NUMBER])); } else if (VALUE_IS_FUNCTION(cx, r)) { type = INS_CONSTPTR(ATOM_TO_STRING(cx->runtime->atomState.typeAtoms[JSTYPE_FUNCTION])); } else { LIns* args[] = { get(&r), cx_ins }; if (JSVAL_TAG(r) == JSVAL_BOOLEAN) { // We specialize identically for boolean and undefined. We must not have a hole here. // Pass the unboxed type here, since TypeOfBoolean knows how to handle it. JS_ASSERT(r == JSVAL_TRUE || r == JSVAL_FALSE || r == JSVAL_VOID); type = lir->insCall(&js_TypeOfBoolean_ci, args); } else { JS_ASSERT(JSVAL_TAG(r) == JSVAL_OBJECT); type = lir->insCall(&js_TypeOfObject_ci, args); } } set(&r, type); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_VOID() { stack(-1, INS_CONST(JSVAL_TO_PSEUDO_BOOLEAN(JSVAL_VOID))); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_INCNAME() { return incName(1); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_INCPROP() { return incProp(1); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_INCELEM() { return incElem(1); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DECNAME() { return incName(-1); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DECPROP() { return incProp(-1); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DECELEM() { return incElem(-1); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::incName(jsint incr, bool pre) { jsval* vp; CHECK_STATUS(name(vp)); LIns* v_ins = get(vp); CHECK_STATUS(inc(*vp, v_ins, incr, pre)); set(vp, v_ins); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_NAMEINC() { return incName(1, false); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_PROPINC() { return incProp(1, false); } // XXX consolidate with record_JSOP_GETELEM code... JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ELEMINC() { return incElem(1, false); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_NAMEDEC() { return incName(-1, false); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_PROPDEC() { return incProp(-1, false); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ELEMDEC() { return incElem(-1, false); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GETPROP() { return getProp(stackval(-1)); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_SETPROP() { jsval& l = stackval(-2); if (JSVAL_IS_PRIMITIVE(l)) ABORT_TRACE("primitive this for SETPROP"); JSObject* obj = JSVAL_TO_OBJECT(l); if (obj->map->ops->setProperty != js_SetProperty) ABORT_TRACE("non-native JSObjectOps::setProperty"); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_SetPropHit(JSPropCacheEntry* entry, JSScopeProperty* sprop) { if (entry == JS_NO_PROP_CACHE_FILL) ABORT_TRACE("can't trace uncacheable property set"); if (PCVCAP_TAG(entry->vcap) >= 1) ABORT_TRACE("can't trace inherited property set"); jsbytecode* pc = cx->fp->regs->pc; JS_ASSERT(entry->kpc == pc); jsval& r = stackval(-1); jsval& l = stackval(-2); JS_ASSERT(!JSVAL_IS_PRIMITIVE(l)); JSObject* obj = JSVAL_TO_OBJECT(l); LIns* obj_ins = get(&l); JSScope* scope = OBJ_SCOPE(obj); JS_ASSERT(scope->object == obj); JS_ASSERT(SCOPE_HAS_PROPERTY(scope, sprop)); if (!isValidSlot(scope, sprop)) return JSRS_STOP; if (obj == globalObj) { JS_ASSERT(SPROP_HAS_VALID_SLOT(sprop, scope)); uint32 slot = sprop->slot; if (!lazilyImportGlobalSlot(slot)) ABORT_TRACE("lazy import of global slot failed"); LIns* r_ins = get(&r); /* * Writing a function into the global object might rebrand it; we don't * trace that case. There's no need to guard on that, though, because * separating functions into the trace-time type TT_FUNCTION will save * the day! */ if (VALUE_IS_FUNCTION(cx, r)) ABORT_TRACE("potential rebranding of the global object"); set(&STOBJ_GET_SLOT(obj, slot), r_ins); JS_ASSERT(*pc != JSOP_INITPROP); if (pc[JSOP_SETPROP_LENGTH] != JSOP_POP) set(&l, r_ins); return JSRS_CONTINUE; } // The global object's shape is guarded at trace entry, all others need a guard here. LIns* map_ins = lir->insLoad(LIR_ldp, obj_ins, (int)offsetof(JSObject, map)); LIns* ops_ins; if (!map_is_native(obj->map, map_ins, ops_ins, offsetof(JSObjectOps, setProperty))) ABORT_TRACE("non-native map"); LIns* shape_ins = addName(lir->insLoad(LIR_ld, map_ins, offsetof(JSScope, shape)), "shape"); guard(true, addName(lir->ins2i(LIR_eq, shape_ins, entry->kshape), "guard(kshape)(record_SetPropHit)"), BRANCH_EXIT); uint32 vshape = PCVCAP_SHAPE(entry->vcap); if (entry->kshape != vshape) { LIns *vshape_ins = lir->insLoad(LIR_ld, lir->insLoad(LIR_ldp, cx_ins, offsetof(JSContext, runtime)), offsetof(JSRuntime, protoHazardShape)); guard(true, addName(lir->ins2i(LIR_eq, vshape_ins, vshape), "guard(vshape)(record_SetPropHit)"), MISMATCH_EXIT); LIns* args[] = { INS_CONSTPTR(sprop), obj_ins, cx_ins }; LIns* ok_ins = lir->insCall(&js_AddProperty_ci, args); guard(false, lir->ins_eq0(ok_ins), OOM_EXIT); } LIns* dslots_ins = NULL; LIns* v_ins = get(&r); LIns* boxed_ins = v_ins; box_jsval(r, boxed_ins); CHECK_STATUS(native_set(obj_ins, sprop, dslots_ins, boxed_ins)); if (*pc != JSOP_INITPROP && pc[JSOP_SETPROP_LENGTH] != JSOP_POP) set(&l, v_ins); return JSRS_CONTINUE; } /* Functions used by JSOP_GETELEM. */ static JSBool GetProperty(JSContext *cx, uintN argc, jsval *vp) { jsval *argv; jsid id; JS_ASSERT_NOT_ON_TRACE(cx); JS_ASSERT(cx->fp->imacpc && argc == 1); argv = JS_ARGV(cx, vp); JS_ASSERT(JSVAL_IS_STRING(argv[0])); if (!js_ValueToStringId(cx, argv[0], &id)) return JS_FALSE; argv[0] = ID_TO_VALUE(id); return OBJ_GET_PROPERTY(cx, JS_THIS_OBJECT(cx, vp), id, &JS_RVAL(cx, vp)); } static jsval FASTCALL GetProperty_tn(JSContext *cx, jsbytecode *pc, JSObject *obj, JSString *name) { JSAutoTempIdRooter idr(cx); JSAutoTempValueRooter tvr(cx); if (!js_ValueToStringId(cx, STRING_TO_JSVAL(name), idr.addr()) || !OBJ_GET_PROPERTY(cx, obj, idr.id(), tvr.addr())) { js_SetBuiltinError(cx); *tvr.addr() = JSVAL_ERROR_COOKIE; } return tvr.value(); } static JSBool GetElement(JSContext *cx, uintN argc, jsval *vp) { jsval *argv; jsid id; JS_ASSERT_NOT_ON_TRACE(cx); JS_ASSERT(cx->fp->imacpc && argc == 1); argv = JS_ARGV(cx, vp); JS_ASSERT(JSVAL_IS_NUMBER(argv[0])); if (!JS_ValueToId(cx, argv[0], &id)) return JS_FALSE; argv[0] = ID_TO_VALUE(id); return OBJ_GET_PROPERTY(cx, JS_THIS_OBJECT(cx, vp), id, &JS_RVAL(cx, vp)); } static jsval FASTCALL GetElement_tn(JSContext* cx, jsbytecode *pc, JSObject* obj, int32 index) { JSAutoTempValueRooter tvr(cx); JSAutoTempIdRooter idr(cx); if (!js_Int32ToId(cx, index, idr.addr())) { js_SetBuiltinError(cx); return JSVAL_ERROR_COOKIE; } if (!OBJ_GET_PROPERTY(cx, obj, idr.id(), tvr.addr())) { js_SetBuiltinError(cx); *tvr.addr() = JSVAL_ERROR_COOKIE; } return tvr.value(); } JS_DEFINE_TRCINFO_1(GetProperty, (4, (static, JSVAL_FAIL, GetProperty_tn, CONTEXT, PC, THIS, STRING, 0, 0))) JS_DEFINE_TRCINFO_1(GetElement, (4, (extern, JSVAL_FAIL, GetElement_tn, CONTEXT, PC, THIS, INT32, 0, 0))) JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GETELEM() { bool call = *cx->fp->regs->pc == JSOP_CALLELEM; jsval& idx = stackval(-1); jsval& lval = stackval(-2); LIns* obj_ins = get(&lval); LIns* idx_ins = get(&idx); // Special case for array-like access of strings. if (JSVAL_IS_STRING(lval) && isInt32(idx)) { if (call) ABORT_TRACE("JSOP_CALLELEM on a string"); int i = asInt32(idx); if (size_t(i) >= JSVAL_TO_STRING(lval)->length()) ABORT_TRACE("Invalid string index in JSOP_GETELEM"); idx_ins = makeNumberInt32(idx_ins); LIns* args[] = { idx_ins, obj_ins, cx_ins }; LIns* unitstr_ins = lir->insCall(&js_String_getelem_ci, args); guard(false, lir->ins_eq0(unitstr_ins), MISMATCH_EXIT); set(&lval, unitstr_ins); return JSRS_CONTINUE; } if (JSVAL_IS_PRIMITIVE(lval)) ABORT_TRACE("JSOP_GETLEM on a primitive"); ABORT_IF_XML(lval); JSObject* obj = JSVAL_TO_OBJECT(lval); jsval id; LIns* v_ins; /* Property access using a string name or something we have to stringify. */ if (!JSVAL_IS_INT(idx)) { if (!JSVAL_IS_PRIMITIVE(idx)) ABORT_TRACE("non-primitive index"); // If index is not a string, turn it into a string. if (!js_InternNonIntElementId(cx, obj, idx, &id)) ABORT_TRACE_ERROR("failed to intern non-int element id"); set(&idx, stringify(idx)); // Store the interned string to the stack to save the interpreter from redoing this work. idx = ID_TO_VALUE(id); // The object is not guaranteed to be a dense array at this point, so it might be the // global object, which we have to guard against. CHECK_STATUS(guardNotGlobalObject(obj, obj_ins)); return call_imacro(call ? callelem_imacros.callprop : getelem_imacros.getprop); } if (!guardDenseArray(obj, obj_ins, BRANCH_EXIT)) { CHECK_STATUS(guardNotGlobalObject(obj, obj_ins)); return call_imacro(call ? callelem_imacros.callelem : getelem_imacros.getelem); } // Fast path for dense arrays accessed with a integer index. jsval* vp; LIns* addr_ins; CHECK_STATUS(denseArrayElement(lval, idx, vp, v_ins, addr_ins)); set(&lval, v_ins); if (call) set(&idx, obj_ins); return JSRS_CONTINUE; } /* Functions used by JSOP_SETELEM */ static JSBool SetProperty(JSContext *cx, uintN argc, jsval *vp) { jsval *argv; jsid id; JS_ASSERT(argc == 2); argv = JS_ARGV(cx, vp); JS_ASSERT(JSVAL_IS_STRING(argv[0])); if (!js_ValueToStringId(cx, argv[0], &id)) return JS_FALSE; argv[0] = ID_TO_VALUE(id); if (!OBJ_SET_PROPERTY(cx, JS_THIS_OBJECT(cx, vp), id, &argv[1])) return JS_FALSE; JS_SET_RVAL(cx, vp, JSVAL_VOID); return JS_TRUE; } static JSBool FASTCALL SetProperty_tn(JSContext* cx, JSObject* obj, JSString* idstr, jsval v) { JSAutoTempValueRooter tvr(cx, v); JSAutoTempIdRooter idr(cx); if (!js_ValueToStringId(cx, STRING_TO_JSVAL(idstr), idr.addr()) || !OBJ_SET_PROPERTY(cx, obj, idr.id(), tvr.addr())) { js_SetBuiltinError(cx); } return JSVAL_TO_PSEUDO_BOOLEAN(JSVAL_VOID); } static JSBool SetElement(JSContext *cx, uintN argc, jsval *vp) { jsval *argv; jsid id; JS_ASSERT(argc == 2); argv = JS_ARGV(cx, vp); JS_ASSERT(JSVAL_IS_NUMBER(argv[0])); if (!JS_ValueToId(cx, argv[0], &id)) return JS_FALSE; argv[0] = ID_TO_VALUE(id); if (!OBJ_SET_PROPERTY(cx, JS_THIS_OBJECT(cx, vp), id, &argv[1])) return JS_FALSE; JS_SET_RVAL(cx, vp, JSVAL_VOID); return JS_TRUE; } static JSBool FASTCALL SetElement_tn(JSContext* cx, JSObject* obj, int32 index, jsval v) { JSAutoTempIdRooter idr(cx); JSAutoTempValueRooter tvr(cx, v); if (!js_Int32ToId(cx, index, idr.addr()) || !OBJ_SET_PROPERTY(cx, obj, idr.id(), tvr.addr())) { js_SetBuiltinError(cx); } return JSVAL_TO_PSEUDO_BOOLEAN(JSVAL_VOID); } JS_DEFINE_TRCINFO_1(SetProperty, (4, (extern, BOOL_FAIL, SetProperty_tn, CONTEXT, THIS, STRING, JSVAL, 0, 0))) JS_DEFINE_TRCINFO_1(SetElement, (4, (extern, BOOL_FAIL, SetElement_tn, CONTEXT, THIS, INT32, JSVAL, 0, 0))) JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_SETELEM() { jsval& v = stackval(-1); jsval& idx = stackval(-2); jsval& lval = stackval(-3); /* no guards for type checks, trace specialized this already */ if (JSVAL_IS_PRIMITIVE(lval)) ABORT_TRACE("left JSOP_SETELEM operand is not an object"); ABORT_IF_XML(lval); JSObject* obj = JSVAL_TO_OBJECT(lval); LIns* obj_ins = get(&lval); LIns* idx_ins = get(&idx); LIns* v_ins = get(&v); jsid id; if (!JSVAL_IS_INT(idx)) { if (!JSVAL_IS_PRIMITIVE(idx)) ABORT_TRACE("non-primitive index"); // If index is not a string, turn it into a string. if (!js_InternNonIntElementId(cx, obj, idx, &id)) ABORT_TRACE_ERROR("failed to intern non-int element id"); set(&idx, stringify(idx)); // Store the interned string to the stack to save the interpreter from redoing this work. idx = ID_TO_VALUE(id); // The object is not guaranteed to be a dense array at this point, so it might be the // global object, which we have to guard against. CHECK_STATUS(guardNotGlobalObject(obj, obj_ins)); return call_imacro((*cx->fp->regs->pc == JSOP_INITELEM) ? initelem_imacros.initprop : setelem_imacros.setprop); } if (JSVAL_TO_INT(idx) < 0 || !OBJ_IS_DENSE_ARRAY(cx, obj)) { CHECK_STATUS(guardNotGlobalObject(obj, obj_ins)); return call_imacro((*cx->fp->regs->pc == JSOP_INITELEM) ? initelem_imacros.initelem : setelem_imacros.setelem); } // Make sure the array is actually dense. if (!guardDenseArray(obj, obj_ins, BRANCH_EXIT)) return JSRS_STOP; // Fast path for dense arrays accessed with a non-negative integer index. In case the trace // calculated the index using the FPU, force it to be an integer. idx_ins = makeNumberInt32(idx_ins); // Box the value so we can use one builtin instead of having to add one builtin for every // storage type. LIns* boxed_v_ins = v_ins; box_jsval(v, boxed_v_ins); LIns* args[] = { boxed_v_ins, idx_ins, obj_ins, cx_ins }; LIns* res_ins = lir->insCall(&js_Array_dense_setelem_ci, args); guard(false, lir->ins_eq0(res_ins), MISMATCH_EXIT); jsbytecode* pc = cx->fp->regs->pc; if (*pc == JSOP_SETELEM && pc[JSOP_SETELEM_LENGTH] != JSOP_POP) set(&lval, v_ins); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_CALLNAME() { JSObject* obj = cx->fp->scopeChain; if (obj != globalObj) { jsval* vp; CHECK_STATUS(activeCallOrGlobalSlot(obj, vp)); stack(0, get(vp)); stack(1, INS_CONSTPTR(globalObj)); return JSRS_CONTINUE; } LIns* obj_ins = scopeChain(); JSObject* obj2; jsuword pcval; CHECK_STATUS(test_property_cache(obj, obj_ins, obj2, pcval)); if (PCVAL_IS_NULL(pcval) || !PCVAL_IS_OBJECT(pcval)) ABORT_TRACE("callee is not an object"); JS_ASSERT(HAS_FUNCTION_CLASS(PCVAL_TO_OBJECT(pcval))); stack(0, INS_CONSTPTR(PCVAL_TO_OBJECT(pcval))); stack(1, obj_ins); return JSRS_CONTINUE; } JS_DEFINE_CALLINFO_5(extern, UINT32, js_GetUpvarArgOnTrace, CONTEXT, UINT32, INT32, UINT32, DOUBLEPTR, 0, 0) JS_DEFINE_CALLINFO_5(extern, UINT32, js_GetUpvarVarOnTrace, CONTEXT, UINT32, INT32, UINT32, DOUBLEPTR, 0, 0) JS_DEFINE_CALLINFO_5(extern, UINT32, js_GetUpvarStackOnTrace, CONTEXT, UINT32, INT32, UINT32, DOUBLEPTR, 0, 0) /* * Record LIR to get the given upvar. Return the LIR instruction for * the upvar value. NULL is returned only on a can't-happen condition * with an invalid typemap. The value of the upvar is returned as v. */ JS_REQUIRES_STACK LIns* TraceRecorder::upvar(JSScript* script, JSUpvarArray* uva, uintN index, jsval& v) { /* * Try to find the upvar in the current trace's tracker. For &vr to be * the address of the jsval found in js_GetUpvar, we must initialize * vr directly with the result, so it is a reference to the same location. * It does not work to assign the result to v, because v is an already * existing reference that points to something else. */ uint32 cookie = uva->vector[index]; jsval& vr = js_GetUpvar(cx, script->staticLevel, cookie); v = vr; LIns* upvar_ins = get(&vr); if (upvar_ins) { return upvar_ins; } /* * The upvar is not in the current trace, so get the upvar value * exactly as the interpreter does and unbox. */ uint32 level = script->staticLevel - UPVAR_FRAME_SKIP(cookie); uint32 cookieSlot = UPVAR_FRAME_SLOT(cookie); JSStackFrame* fp = cx->display[level]; const CallInfo* ci; int32 slot; if (!fp->fun) { ci = &js_GetUpvarStackOnTrace_ci; slot = cookieSlot; } else if (cookieSlot < fp->fun->nargs) { ci = &js_GetUpvarArgOnTrace_ci; slot = cookieSlot; } else if (cookieSlot == CALLEE_UPVAR_SLOT) { ci = &js_GetUpvarArgOnTrace_ci; slot = -2; } else { ci = &js_GetUpvarVarOnTrace_ci; slot = cookieSlot - fp->fun->nargs; } LIns* outp = lir->insAlloc(sizeof(double)); LIns* args[] = { outp, INS_CONST(callDepth), INS_CONST(slot), INS_CONST(level), cx_ins }; LIns* call_ins = lir->insCall(ci, args); JSTraceType type = getCoercedType(v); guard(true, addName(lir->ins2(LIR_eq, call_ins, lir->insImm(type)), "guard(type-stable upvar)"), BRANCH_EXIT); LOpcode loadOp; switch (type) { case TT_DOUBLE: loadOp = LIR_ldq; break; case TT_OBJECT: case TT_STRING: case TT_FUNCTION: case TT_NULL: loadOp = LIR_ldp; break; case TT_INT32: case TT_PSEUDOBOOLEAN: loadOp = LIR_ld; break; case TT_JSVAL: default: JS_NOT_REACHED("found jsval type in an upvar type map entry"); return NULL; } LIns* result = lir->insLoad(loadOp, outp, lir->insImm(0)); if (type == TT_INT32) result = lir->ins1(LIR_i2f, result); return result; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GETUPVAR() { uintN index = GET_UINT16(cx->fp->regs->pc); JSScript *script = cx->fp->script; JSUpvarArray* uva = JS_SCRIPT_UPVARS(script); JS_ASSERT(index < uva->length); jsval v; LIns* upvar_ins = upvar(script, uva, index, v); if (!upvar_ins) return JSRS_STOP; stack(0, upvar_ins); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_CALLUPVAR() { CHECK_STATUS(record_JSOP_GETUPVAR()); stack(1, INS_CONSTPTR(NULL)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GETDSLOT() { JSObject* callee = cx->fp->callee; LIns* callee_ins = get(&cx->fp->argv[-2]); unsigned index = GET_UINT16(cx->fp->regs->pc); LIns* dslots_ins = NULL; LIns* v_ins = stobj_get_dslot(callee_ins, index, dslots_ins); unbox_jsval(callee->dslots[index], v_ins, snapshot(BRANCH_EXIT)); stack(0, v_ins); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_CALLDSLOT() { CHECK_STATUS(record_JSOP_GETDSLOT()); stack(1, INS_CONSTPTR(NULL)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::guardCallee(jsval& callee) { JS_ASSERT(VALUE_IS_FUNCTION(cx, callee)); VMSideExit* branchExit = snapshot(BRANCH_EXIT); JSObject* callee_obj = JSVAL_TO_OBJECT(callee); LIns* callee_ins = get(&callee); guard(true, lir->ins2(LIR_eq, lir->ins2(LIR_piand, stobj_get_fslot(callee_ins, JSSLOT_PRIVATE), INS_CONSTWORD(~JSVAL_INT)), INS_CONSTPTR(OBJ_GET_PRIVATE(cx, callee_obj))), branchExit); guard(true, lir->ins2(LIR_eq, stobj_get_fslot(callee_ins, JSSLOT_PARENT), INS_CONSTPTR(OBJ_GET_PARENT(cx, callee_obj))), branchExit); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::interpretedFunctionCall(jsval& fval, JSFunction* fun, uintN argc, bool constructing) { if (JS_GetGlobalForObject(cx, JSVAL_TO_OBJECT(fval)) != globalObj) ABORT_TRACE("JSOP_CALL or JSOP_NEW crosses global scopes"); JSStackFrame* fp = cx->fp; // TODO: track the copying via the tracker... if (argc < fun->nargs && jsuword(fp->regs->sp + (fun->nargs - argc)) > cx->stackPool.current->limit) { ABORT_TRACE("can't trace calls with too few args requiring argv move"); } // Generate a type map for the outgoing frame and stash it in the LIR unsigned stackSlots = js_NativeStackSlots(cx, 0/*callDepth*/); if (sizeof(FrameInfo) + stackSlots * sizeof(JSTraceType) > NJ_MAX_SKIP_PAYLOAD_SZB) ABORT_TRACE("interpreted function call requires saving too much stack"); LIns* data = lir->insSkip(sizeof(FrameInfo) + stackSlots * sizeof(JSTraceType)); FrameInfo* fi = (FrameInfo*)data->payload(); JSTraceType* typemap = reinterpret_cast(fi + 1); DetermineTypesVisitor detVisitor(*this, typemap); VisitStackSlots(detVisitor, cx, 0); if (argc >= 0x8000) ABORT_TRACE("too many arguments"); fi->callee = JSVAL_TO_OBJECT(fval); fi->block = fp->blockChain; fi->pc = fp->regs->pc; fi->imacpc = fp->imacpc; fi->spdist = fp->regs->sp - fp->slots; fi->set_argc(argc, constructing); fi->spoffset = 2 /*callee,this*/ + fp->argc; unsigned callDepth = getCallDepth(); if (callDepth >= treeInfo->maxCallDepth) treeInfo->maxCallDepth = callDepth + 1; if (callDepth == 0) fi->spoffset = 2 /*callee,this*/ + argc - fi->spdist; lir->insStorei(INS_CONSTPTR(fi), lirbuf->rp, callDepth * sizeof(FrameInfo*)); atoms = fun->u.i.script->atomMap.vector; return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_CALL() { uintN argc = GET_ARGC(cx->fp->regs->pc); cx->fp->assertValidStackDepth(argc + 2); return functionCall(argc, (cx->fp->imacpc && *cx->fp->imacpc == JSOP_APPLY) ? JSOP_APPLY : JSOP_CALL); } static jsbytecode* apply_imacro_table[] = { apply_imacros.apply0, apply_imacros.apply1, apply_imacros.apply2, apply_imacros.apply3, apply_imacros.apply4, apply_imacros.apply5, apply_imacros.apply6, apply_imacros.apply7, apply_imacros.apply8 }; static jsbytecode* call_imacro_table[] = { apply_imacros.call0, apply_imacros.call1, apply_imacros.call2, apply_imacros.call3, apply_imacros.call4, apply_imacros.call5, apply_imacros.call6, apply_imacros.call7, apply_imacros.call8 }; JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_APPLY() { JSStackFrame* fp = cx->fp; jsbytecode *pc = fp->regs->pc; uintN argc = GET_ARGC(pc); cx->fp->assertValidStackDepth(argc + 2); jsval* vp = fp->regs->sp - (argc + 2); jsuint length = 0; JSObject* aobj = NULL; LIns* aobj_ins = NULL; JS_ASSERT(!fp->imacpc); if (!VALUE_IS_FUNCTION(cx, vp[0])) return record_JSOP_CALL(); ABORT_IF_XML(vp[0]); JSObject* obj = JSVAL_TO_OBJECT(vp[0]); JSFunction* fun = GET_FUNCTION_PRIVATE(cx, obj); if (FUN_INTERPRETED(fun)) return record_JSOP_CALL(); bool apply = (JSFastNative)fun->u.n.native == js_fun_apply; if (!apply && (JSFastNative)fun->u.n.native != js_fun_call) return record_JSOP_CALL(); /* * We don't trace apply and call with a primitive 'this', which is the * first positional parameter. */ if (argc > 0 && JSVAL_IS_PRIMITIVE(vp[2])) return record_JSOP_CALL(); /* * Guard on the identity of this, which is the function we are applying. */ if (!VALUE_IS_FUNCTION(cx, vp[1])) ABORT_TRACE("callee is not a function"); CHECK_STATUS(guardCallee(vp[1])); if (apply && argc >= 2) { if (argc != 2) ABORT_TRACE("apply with excess arguments"); if (JSVAL_IS_PRIMITIVE(vp[3])) ABORT_TRACE("arguments parameter of apply is primitive"); aobj = JSVAL_TO_OBJECT(vp[3]); aobj_ins = get(&vp[3]); /* * We expect a dense array for the arguments (the other * frequent case is the arguments object, but that we * don't trace at the moment). */ if (!guardDenseArray(aobj, aobj_ins)) ABORT_TRACE("arguments parameter of apply is not a dense array"); /* * We trace only apply calls with a certain number of arguments. */ length = jsuint(aobj->fslots[JSSLOT_ARRAY_LENGTH]); if (length >= JS_ARRAY_LENGTH(apply_imacro_table)) ABORT_TRACE("too many arguments to apply"); /* * Make sure the array has the same length at runtime. */ guard(true, lir->ins2i(LIR_eq, stobj_get_fslot(aobj_ins, JSSLOT_ARRAY_LENGTH), length), BRANCH_EXIT); return call_imacro(apply_imacro_table[length]); } if (argc >= JS_ARRAY_LENGTH(call_imacro_table)) ABORT_TRACE("too many arguments to call"); return call_imacro(call_imacro_table[argc]); } static JSBool FASTCALL CatchStopIteration_tn(JSContext* cx, JSBool ok, jsval* vp) { if (!ok && cx->throwing && js_ValueIsStopIteration(cx->exception)) { cx->throwing = JS_FALSE; cx->exception = JSVAL_VOID; *vp = JSVAL_HOLE; return JS_TRUE; } return ok; } JS_DEFINE_TRCINFO_1(CatchStopIteration_tn, (3, (static, BOOL, CatchStopIteration_tn, CONTEXT, BOOL, JSVALPTR, 0, 0))) JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_NativeCallComplete() { if (pendingTraceableNative == IGNORE_NATIVE_CALL_COMPLETE_CALLBACK) return JSRS_CONTINUE; jsbytecode* pc = cx->fp->regs->pc; JS_ASSERT(pendingTraceableNative); JS_ASSERT(*pc == JSOP_CALL || *pc == JSOP_APPLY || *pc == JSOP_NEW); jsval& v = stackval(-1); LIns* v_ins = get(&v); /* At this point the generated code has already called the native function and we can no longer fail back to the original pc location (JSOP_CALL) because that would cause the interpreter to re-execute the native function, which might have side effects. Instead, the snapshot() call below sees that we are currently parked on a traceable native's JSOP_CALL instruction, and it will advance the pc to restore by the length of the current opcode. If the native's return type is jsval, snapshot() will also indicate in the type map that the element on top of the stack is a boxed value which doesn't need to be boxed if the type guard generated by unbox_jsval() fails. */ if (JSTN_ERRTYPE(pendingTraceableNative) == FAIL_STATUS) { // Keep cx->bailExit null when it's invalid. lir->insStorei(INS_CONSTPTR(NULL), cx_ins, (int) offsetof(JSContext, bailExit)); LIns* status = lir->insLoad(LIR_ld, lirbuf->state, (int) offsetof(InterpState, builtinStatus)); if (pendingTraceableNative == generatedTraceableNative) { LIns* ok_ins = v_ins; /* * Custom implementations of Iterator.next() throw a StopIteration exception. * Catch and clear it and set the return value to JSVAL_HOLE in this case. */ if (uintptr_t(pc - nextiter_imacros.custom_iter_next) < sizeof(nextiter_imacros.custom_iter_next)) { LIns* args[] = { native_rval_ins, ok_ins, cx_ins }; /* reverse order */ ok_ins = lir->insCall(&CatchStopIteration_tn_ci, args); } /* * If we run a generic traceable native, the return value is in the argument * vector for native function calls. The actual return value of the native is a JSBool * indicating the error status. */ v_ins = lir->insLoad(LIR_ld, native_rval_ins, 0); if (*pc == JSOP_NEW) { LIns* x = lir->ins_eq0(lir->ins2i(LIR_piand, v_ins, JSVAL_TAGMASK)); x = lir->ins_choose(x, v_ins, INS_CONST(0)); v_ins = lir->ins_choose(lir->ins_eq0(x), newobj_ins, x); } set(&v, v_ins); /* * If this is a generic traceable native invocation, propagate the boolean return * value of the native into builtinStatus. If the return value (v_ins) * is true, status' == status. Otherwise status' = status | JSBUILTIN_ERROR. * We calculate (rval&1)^1, which is 1 if rval is JS_FALSE (error), and then * shift that by 1 which is JSBUILTIN_ERROR. */ JS_STATIC_ASSERT((1 - JS_TRUE) << 1 == 0); JS_STATIC_ASSERT((1 - JS_FALSE) << 1 == JSBUILTIN_ERROR); status = lir->ins2(LIR_or, status, lir->ins2i(LIR_lsh, lir->ins2i(LIR_xor, lir->ins2i(LIR_and, ok_ins, 1), 1), 1)); lir->insStorei(status, lirbuf->state, (int) offsetof(InterpState, builtinStatus)); } guard(true, lir->ins_eq0(status), STATUS_EXIT); } JSRecordingStatus ok = JSRS_CONTINUE; if (pendingTraceableNative->flags & JSTN_UNBOX_AFTER) { /* * If we side exit on the unboxing code due to a type change, make sure that the boxed * value is actually currently associated with that location, and that we are talking * about the top of the stack here, which is where we expected boxed values. */ JS_ASSERT(&v == &cx->fp->regs->sp[-1] && get(&v) == v_ins); unbox_jsval(v, v_ins, snapshot(BRANCH_EXIT)); set(&v, v_ins); } else if (JSTN_ERRTYPE(pendingTraceableNative) == FAIL_NEG) { /* Already added i2f in functionCall. */ JS_ASSERT(JSVAL_IS_NUMBER(v)); } else { /* Convert the result to double if the builtin returns int32. */ if (JSVAL_IS_NUMBER(v) && (pendingTraceableNative->builtin->_argtypes & 3) == nanojit::ARGSIZE_LO) { set(&v, lir->ins1(LIR_i2f, v_ins)); } } // We'll null pendingTraceableNative in monitorRecording, on the next op cycle. // There must be a next op since the stack is non-empty. return ok; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::name(jsval*& vp) { JSObject* obj = cx->fp->scopeChain; if (obj != globalObj) return activeCallOrGlobalSlot(obj, vp); /* Can't use prop here, because we don't want unboxing from global slots. */ LIns* obj_ins = scopeChain(); uint32 slot; JSObject* obj2; jsuword pcval; /* * Property cache ensures that we are dealing with an existing property, * and guards the shape for us. */ CHECK_STATUS(test_property_cache(obj, obj_ins, obj2, pcval)); /* * Abort if property doesn't exist (interpreter will report an error.) */ if (PCVAL_IS_NULL(pcval)) ABORT_TRACE("named property not found"); /* * Insist on obj being the directly addressed object. */ if (obj2 != obj) ABORT_TRACE("name() hit prototype chain"); /* Don't trace getter or setter calls, our caller wants a direct slot. */ if (PCVAL_IS_SPROP(pcval)) { JSScopeProperty* sprop = PCVAL_TO_SPROP(pcval); if (!isValidSlot(OBJ_SCOPE(obj), sprop)) ABORT_TRACE("name() not accessing a valid slot"); slot = sprop->slot; } else { if (!PCVAL_IS_SLOT(pcval)) ABORT_TRACE("PCE is not a slot"); slot = PCVAL_TO_SLOT(pcval); } if (!lazilyImportGlobalSlot(slot)) ABORT_TRACE("lazy import of global slot failed"); vp = &STOBJ_GET_SLOT(obj, slot); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::prop(JSObject* obj, LIns* obj_ins, uint32& slot, LIns*& v_ins) { /* * Can't specialize to assert obj != global, must guard to avoid aliasing * stale homes of stacked global variables. */ CHECK_STATUS(guardNotGlobalObject(obj, obj_ins)); /* * Property cache ensures that we are dealing with an existing property, * and guards the shape for us. */ JSObject* obj2; jsuword pcval; CHECK_STATUS(test_property_cache(obj, obj_ins, obj2, pcval)); /* Check for non-existent property reference, which results in undefined. */ const JSCodeSpec& cs = js_CodeSpec[*cx->fp->regs->pc]; if (PCVAL_IS_NULL(pcval)) { /* * We could specialize to guard on just JSClass.getProperty, but a mere * class guard is simpler and slightly faster. */ if (OBJ_GET_CLASS(cx, obj)->getProperty != JS_PropertyStub) { ABORT_TRACE("can't trace through access to undefined property if " "JSClass.getProperty hook isn't stubbed"); } guardClass(obj, obj_ins, OBJ_GET_CLASS(cx, obj), snapshot(MISMATCH_EXIT)); /* * This trace will be valid as long as neither the object nor any object * on its prototype chain changes shape. * * FIXME: This loop can become a single shape guard once bug 497789 has * been fixed. */ VMSideExit* exit = snapshot(BRANCH_EXIT); do { LIns* map_ins = lir->insLoad(LIR_ldp, obj_ins, (int)offsetof(JSObject, map)); LIns* ops_ins; if (map_is_native(obj->map, map_ins, ops_ins)) { LIns* shape_ins = addName(lir->insLoad(LIR_ld, map_ins, offsetof(JSScope, shape)), "shape"); guard(true, addName(lir->ins2i(LIR_eq, shape_ins, OBJ_SHAPE(obj)), "guard(shape)"), exit); } else if (!guardDenseArray(obj, obj_ins, BRANCH_EXIT)) ABORT_TRACE("non-native object involved in undefined property access"); } while (guardHasPrototype(obj, obj_ins, &obj, &obj_ins, exit)); v_ins = INS_CONST(JSVAL_TO_PSEUDO_BOOLEAN(JSVAL_VOID)); slot = SPROP_INVALID_SLOT; return JSRS_CONTINUE; } /* Insist if setting on obj being the directly addressed object. */ uint32 setflags = (cs.format & (JOF_SET | JOF_INCDEC | JOF_FOR)); LIns* dslots_ins = NULL; /* Don't trace getter or setter calls, our caller wants a direct slot. */ if (PCVAL_IS_SPROP(pcval)) { JSScopeProperty* sprop = PCVAL_TO_SPROP(pcval); if (setflags && !SPROP_HAS_STUB_SETTER(sprop)) ABORT_TRACE("non-stub setter"); if (setflags && (sprop->attrs & JSPROP_READONLY)) ABORT_TRACE("writing to a readonly property"); if (setflags != JOF_SET && !SPROP_HAS_STUB_GETTER(sprop)) { // FIXME 450335: generalize this away from regexp built-in getters. if (setflags == 0 && sprop->getter == js_RegExpClass.getProperty && sprop->shortid < 0) { if (sprop->shortid == REGEXP_LAST_INDEX) ABORT_TRACE("can't trace RegExp.lastIndex yet"); LIns* args[] = { INS_CONSTPTR(sprop), obj_ins, cx_ins }; v_ins = lir->insCall(&js_CallGetter_ci, args); guard(false, lir->ins2(LIR_eq, v_ins, INS_CONST(JSVAL_ERROR_COOKIE)), OOM_EXIT); /* * BIG FAT WARNING: This snapshot cannot be a BRANCH_EXIT, since * the value to the top of the stack is not the value we unbox. */ unbox_jsval((sprop->shortid == REGEXP_SOURCE) ? JSVAL_STRING : JSVAL_BOOLEAN, v_ins, snapshot(MISMATCH_EXIT)); return JSRS_CONTINUE; } if (setflags == 0 && sprop->getter == js_StringClass.getProperty && sprop->id == ATOM_KEY(cx->runtime->atomState.lengthAtom)) { if (!guardClass(obj, obj_ins, &js_StringClass, snapshot(MISMATCH_EXIT))) ABORT_TRACE("can't trace String.length on non-String objects"); LIns* str_ins = stobj_get_fslot(obj_ins, JSSLOT_PRIVATE); str_ins = lir->ins2(LIR_piand, str_ins, INS_CONSTWORD(~JSVAL_TAGMASK)); v_ins = lir->ins1(LIR_i2f, getStringLength(str_ins)); return JSRS_CONTINUE; } ABORT_TRACE("non-stub getter"); } if (!SPROP_HAS_VALID_SLOT(sprop, OBJ_SCOPE(obj2))) ABORT_TRACE("no valid slot"); slot = sprop->slot; } else { if (!PCVAL_IS_SLOT(pcval)) ABORT_TRACE("PCE is not a slot"); slot = PCVAL_TO_SLOT(pcval); } if (obj2 != obj) { if (setflags) ABORT_TRACE("JOF_SET opcode hit prototype chain"); /* * We're getting a proto-property. Walk up the prototype chain emitting * proto slot loads, updating obj as we go, leaving obj set to obj2 with * obj_ins the last proto-load. */ while (obj != obj2) { obj_ins = stobj_get_slot(obj_ins, JSSLOT_PROTO, dslots_ins); obj = STOBJ_GET_PROTO(obj); } } v_ins = stobj_get_slot(obj_ins, slot, dslots_ins); unbox_jsval(STOBJ_GET_SLOT(obj, slot), v_ins, snapshot(BRANCH_EXIT)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::denseArrayElement(jsval& oval, jsval& ival, jsval*& vp, LIns*& v_ins, LIns*& addr_ins) { JS_ASSERT(JSVAL_IS_OBJECT(oval) && JSVAL_IS_INT(ival)); JSObject* obj = JSVAL_TO_OBJECT(oval); LIns* obj_ins = get(&oval); jsint idx = JSVAL_TO_INT(ival); LIns* idx_ins = makeNumberInt32(get(&ival)); VMSideExit* exit = snapshot(BRANCH_EXIT); /* check that the index is within bounds */ LIns* dslots_ins = lir->insLoad(LIR_ldp, obj_ins, offsetof(JSObject, dslots)); jsuint capacity = js_DenseArrayCapacity(obj); bool within = (jsuint(idx) < jsuint(obj->fslots[JSSLOT_ARRAY_LENGTH]) && jsuint(idx) < capacity); if (!within) { /* If idx < 0, stay on trace (and read value as undefined, since this is a dense array). */ LIns* br1 = NULL; if (MAX_DSLOTS_LENGTH > JS_BITMASK(30) && !idx_ins->isconst()) { JS_ASSERT(sizeof(jsval) == 8); // Only 64-bit machines support large enough arrays for this. br1 = lir->insBranch(LIR_jt, lir->ins2i(LIR_lt, idx_ins, 0), NULL); } /* If not idx < length, stay on trace (and read value as undefined). */ LIns* br2 = lir->insBranch(LIR_jf, lir->ins2(LIR_ult, idx_ins, stobj_get_fslot(obj_ins, JSSLOT_ARRAY_LENGTH)), NULL); /* If dslots is NULL, stay on trace (and read value as undefined). */ LIns* br3 = lir->insBranch(LIR_jt, lir->ins_eq0(dslots_ins), NULL); /* If not idx < capacity, stay on trace (and read value as undefined). */ LIns* br4 = lir->insBranch(LIR_jf, lir->ins2(LIR_ult, idx_ins, lir->insLoad(LIR_ldp, dslots_ins, -(int)sizeof(jsval))), NULL); lir->insGuard(LIR_x, lir->insImm(1), createGuardRecord(exit)); LIns* label = lir->ins0(LIR_label); if (br1) br1->setTarget(label); br2->setTarget(label); br3->setTarget(label); br4->setTarget(label); CHECK_STATUS(guardPrototypeHasNoIndexedProperties(obj, obj_ins, MISMATCH_EXIT)); // Return undefined and indicate that we didn't actually read this (addr_ins). v_ins = lir->insImm(JSVAL_TO_PSEUDO_BOOLEAN(JSVAL_VOID)); addr_ins = NULL; return JSRS_CONTINUE; } /* Guard against negative index */ if (MAX_DSLOTS_LENGTH > JS_BITMASK(30) && !idx_ins->isconst()) { JS_ASSERT(sizeof(jsval) == 8); // Only 64-bit machines support large enough arrays for this. guard(false, lir->ins2i(LIR_lt, idx_ins, 0), exit); } /* Guard array length */ guard(true, lir->ins2(LIR_ult, idx_ins, stobj_get_fslot(obj_ins, JSSLOT_ARRAY_LENGTH)), exit); /* dslots must not be NULL */ guard(false, lir->ins_eq0(dslots_ins), exit); /* Guard array capacity */ guard(true, lir->ins2(LIR_ult, idx_ins, lir->insLoad(LIR_ldp, dslots_ins, 0 - (int)sizeof(jsval))), exit); /* Load the value and guard on its type to unbox it. */ vp = &obj->dslots[jsuint(idx)]; addr_ins = lir->ins2(LIR_piadd, dslots_ins, lir->ins2i(LIR_pilsh, idx_ins, (sizeof(jsval) == 4) ? 2 : 3)); v_ins = lir->insLoad(LIR_ldp, addr_ins, 0); unbox_jsval(*vp, v_ins, exit); if (JSVAL_TAG(*vp) == JSVAL_BOOLEAN) { /* * If we read a hole from the array, convert it to undefined and guard that there * are no indexed properties along the prototype chain. */ LIns* br = lir->insBranch(LIR_jf, lir->ins2i(LIR_eq, v_ins, JSVAL_TO_PSEUDO_BOOLEAN(JSVAL_HOLE)), NULL); CHECK_STATUS(guardPrototypeHasNoIndexedProperties(obj, obj_ins, MISMATCH_EXIT)); br->setTarget(lir->ins0(LIR_label)); /* * Don't let the hole value escape. Turn it into an undefined. */ v_ins = lir->ins2i(LIR_and, v_ins, ~(JSVAL_HOLE_FLAG >> JSVAL_TAGBITS)); } return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::getProp(JSObject* obj, LIns* obj_ins) { uint32 slot; LIns* v_ins; CHECK_STATUS(prop(obj, obj_ins, slot, v_ins)); const JSCodeSpec& cs = js_CodeSpec[*cx->fp->regs->pc]; JS_ASSERT(cs.ndefs == 1); stack(-cs.nuses, v_ins); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::getProp(jsval& v) { if (JSVAL_IS_PRIMITIVE(v)) ABORT_TRACE("primitive lhs"); return getProp(JSVAL_TO_OBJECT(v), get(&v)); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_NAME() { jsval* vp; CHECK_STATUS(name(vp)); stack(0, get(vp)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DOUBLE() { jsval v = jsval(atoms[GET_INDEX(cx->fp->regs->pc)]); stack(0, lir->insImmf(*JSVAL_TO_DOUBLE(v))); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_STRING() { JSAtom* atom = atoms[GET_INDEX(cx->fp->regs->pc)]; JS_ASSERT(ATOM_IS_STRING(atom)); stack(0, INS_CONSTPTR(ATOM_TO_STRING(atom))); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ZERO() { stack(0, lir->insImmq(0)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ONE() { stack(0, lir->insImmf(1)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_NULL() { stack(0, INS_CONSTPTR(NULL)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_THIS() { LIns* this_ins; CHECK_STATUS(getThis(this_ins)); stack(0, this_ins); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_FALSE() { stack(0, lir->insImm(0)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_TRUE() { stack(0, lir->insImm(1)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_OR() { return ifop(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_AND() { return ifop(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_TABLESWITCH() { #ifdef NANOJIT_IA32 /* Handle tableswitches specially -- prepare a jump table if needed. */ LIns* guardIns = tableswitch(); if (guardIns) { fragment->lastIns = guardIns; compile(&JS_TRACE_MONITOR(cx)); } return JSRS_STOP; #else return switchop(); #endif } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_LOOKUPSWITCH() { return switchop(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_STRICTEQ() { strictEquality(true, false); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_STRICTNE() { strictEquality(false, false); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_OBJECT() { JSStackFrame* fp = cx->fp; JSScript* script = fp->script; unsigned index = atoms - script->atomMap.vector + GET_INDEX(fp->regs->pc); JSObject* obj; JS_GET_SCRIPT_OBJECT(script, index, obj); stack(0, INS_CONSTPTR(obj)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_POP() { return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_TRAP() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GETARG() { stack(0, arg(GET_ARGNO(cx->fp->regs->pc))); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_SETARG() { arg(GET_ARGNO(cx->fp->regs->pc), stack(-1)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GETLOCAL() { stack(0, var(GET_SLOTNO(cx->fp->regs->pc))); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_SETLOCAL() { var(GET_SLOTNO(cx->fp->regs->pc), stack(-1)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_UINT16() { stack(0, lir->insImmf(GET_UINT16(cx->fp->regs->pc))); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_NEWINIT() { JSProtoKey key = JSProtoKey(GET_INT8(cx->fp->regs->pc)); LIns *proto_ins; CHECK_STATUS(getClassPrototype(key, proto_ins)); LIns* args[] = { proto_ins, cx_ins }; const CallInfo *ci = (key == JSProto_Array) ? &js_NewEmptyArray_ci : &js_Object_tn_ci; LIns* v_ins = lir->insCall(ci, args); guard(false, lir->ins_eq0(v_ins), OOM_EXIT); stack(0, v_ins); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ENDINIT() { #ifdef DEBUG jsval& v = stackval(-1); JS_ASSERT(!JSVAL_IS_PRIMITIVE(v)); #endif return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_INITPROP() { // All the action is in record_SetPropHit. return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_INITELEM() { return record_JSOP_SETELEM(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DEFSHARP() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_USESHARP() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_INCARG() { return inc(argval(GET_ARGNO(cx->fp->regs->pc)), 1); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_INCLOCAL() { return inc(varval(GET_SLOTNO(cx->fp->regs->pc)), 1); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DECARG() { return inc(argval(GET_ARGNO(cx->fp->regs->pc)), -1); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DECLOCAL() { return inc(varval(GET_SLOTNO(cx->fp->regs->pc)), -1); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ARGINC() { return inc(argval(GET_ARGNO(cx->fp->regs->pc)), 1, false); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_LOCALINC() { return inc(varval(GET_SLOTNO(cx->fp->regs->pc)), 1, false); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ARGDEC() { return inc(argval(GET_ARGNO(cx->fp->regs->pc)), -1, false); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_LOCALDEC() { return inc(varval(GET_SLOTNO(cx->fp->regs->pc)), -1, false); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_IMACOP() { JS_ASSERT(cx->fp->imacpc); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ITER() { jsval& v = stackval(-1); if (JSVAL_IS_PRIMITIVE(v)) ABORT_TRACE("for-in on a primitive value"); ABORT_IF_XML(v); jsuint flags = cx->fp->regs->pc[1]; if (hasIteratorMethod(JSVAL_TO_OBJECT(v))) { if (flags == JSITER_ENUMERATE) return call_imacro(iter_imacros.for_in); if (flags == (JSITER_ENUMERATE | JSITER_FOREACH)) return call_imacro(iter_imacros.for_each); } else { if (flags == JSITER_ENUMERATE) return call_imacro(iter_imacros.for_in_native); if (flags == (JSITER_ENUMERATE | JSITER_FOREACH)) return call_imacro(iter_imacros.for_each_native); } ABORT_TRACE("unimplemented JSITER_* flags"); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_NEXTITER() { jsval& iterobj_val = stackval(-2); if (JSVAL_IS_PRIMITIVE(iterobj_val)) ABORT_TRACE("for-in on a primitive value"); ABORT_IF_XML(iterobj_val); JSObject* iterobj = JSVAL_TO_OBJECT(iterobj_val); JSClass* clasp = STOBJ_GET_CLASS(iterobj); LIns* iterobj_ins = get(&iterobj_val); if (clasp == &js_IteratorClass || clasp == &js_GeneratorClass) { guardClass(iterobj, iterobj_ins, clasp, snapshot(BRANCH_EXIT)); return call_imacro(nextiter_imacros.native_iter_next); } return call_imacro(nextiter_imacros.custom_iter_next); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ENDITER() { LIns* args[] = { stack(-2), cx_ins }; LIns* ok_ins = lir->insCall(&js_CloseIterator_ci, args); guard(false, lir->ins_eq0(ok_ins), MISMATCH_EXIT); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_FORNAME() { jsval* vp; CHECK_STATUS(name(vp)); set(vp, stack(-1)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_FORPROP() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_FORELEM() { return record_JSOP_DUP(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_FORARG() { return record_JSOP_SETARG(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_FORLOCAL() { return record_JSOP_SETLOCAL(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_POPN() { return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_BINDNAME() { JSStackFrame *fp = cx->fp; JSObject *obj; if (fp->fun) { // We can't trace BINDNAME in functions that contain direct // calls to eval, as they might add bindings which // previously-traced references would have to see. if (JSFUN_HEAVYWEIGHT_TEST(fp->fun->flags)) ABORT_TRACE("Can't trace JSOP_BINDNAME in heavyweight functions."); // In non-heavyweight functions, we can safely skip the call // object, if any. obj = OBJ_GET_PARENT(cx, fp->callee); } else { obj = fp->scopeChain; // In global code, fp->scopeChain can only contain blocks // whose values are still on the stack. We never use BINDNAME // to refer to these. while (OBJ_GET_CLASS(cx, obj) == &js_BlockClass) { // The block's values are still on the stack. JS_ASSERT(OBJ_GET_PRIVATE(cx, obj) == fp); obj = OBJ_GET_PARENT(cx, obj); // Blocks always have parents. JS_ASSERT(obj); } } if (obj != globalObj) ABORT_TRACE("JSOP_BINDNAME must return global object on trace"); // The trace is specialized to this global object. Furthermore, // we know it is the sole 'global' object on the scope chain: we // set globalObj to the scope chain element with no parent, and we // reached it starting from the function closure or the current // scopeChain, so there is nothing inner to it. So this must be // the right base object. stack(0, INS_CONSTPTR(globalObj)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_SETNAME() { jsval& l = stackval(-2); JS_ASSERT(!JSVAL_IS_PRIMITIVE(l)); /* * Trace cases that are global code or in lightweight functions scoped by * the global object only. */ JSObject* obj = JSVAL_TO_OBJECT(l); if (obj != cx->fp->scopeChain || obj != globalObj) ABORT_TRACE("JSOP_SETNAME left operand is not the global object"); // The rest of the work is in record_SetPropHit. return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_THROW() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_IN() { jsval& rval = stackval(-1); jsval& lval = stackval(-2); if (JSVAL_IS_PRIMITIVE(rval)) ABORT_TRACE("JSOP_IN on non-object right operand"); JSObject* obj = JSVAL_TO_OBJECT(rval); LIns* obj_ins = get(&rval); jsid id; LIns* x; if (JSVAL_IS_INT(lval)) { id = INT_JSVAL_TO_JSID(lval); LIns* args[] = { makeNumberInt32(get(&lval)), obj_ins, cx_ins }; x = lir->insCall(&js_HasNamedPropertyInt32_ci, args); } else if (JSVAL_IS_STRING(lval)) { if (!js_ValueToStringId(cx, lval, &id)) ABORT_TRACE_ERROR("left operand of JSOP_IN didn't convert to a string-id"); LIns* args[] = { get(&lval), obj_ins, cx_ins }; x = lir->insCall(&js_HasNamedProperty_ci, args); } else { ABORT_TRACE("string or integer expected"); } guard(false, lir->ins2i(LIR_eq, x, JSVAL_TO_PSEUDO_BOOLEAN(JSVAL_VOID)), OOM_EXIT); x = lir->ins2i(LIR_eq, x, 1); JSObject* obj2; JSProperty* prop; if (!OBJ_LOOKUP_PROPERTY(cx, obj, id, &obj2, &prop)) ABORT_TRACE_ERROR("OBJ_LOOKUP_PROPERTY failed in JSOP_IN"); bool cond = prop != NULL; if (prop) OBJ_DROP_PROPERTY(cx, obj2, prop); if (wasDeepAborted()) ABORT_TRACE("deep abort from property lookup"); /* The interpreter fuses comparisons and the following branch, so we have to do that here as well. */ fuseIf(cx->fp->regs->pc + 1, cond, x); /* We update the stack after the guard. This is safe since the guard bails out at the comparison and the interpreter will therefore re-execute the comparison. This way the value of the condition doesn't have to be calculated and saved on the stack in most cases. */ set(&lval, x); return JSRS_CONTINUE; } static JSBool HasInstance(JSContext *cx, uintN argc, jsval *vp) { jsval *argv; JS_ASSERT(argc == 1); argv = JS_ARGV(cx, vp); JSBool result = JS_FALSE; JSObject* obj = JS_THIS_OBJECT(cx, vp); if (!obj->map->ops->hasInstance(cx, obj, argv[0], &result)) return JS_FALSE; JS_SET_RVAL(cx, vp, BOOLEAN_TO_JSVAL(result)); return JS_TRUE; } static JSBool FASTCALL HasInstance_tn(JSContext* cx, JSObject* obj, jsval v) { JSBool result = JS_FALSE; if (!obj->map->ops->hasInstance(cx, obj, v, &result)) js_SetBuiltinError(cx); return result; } JS_DEFINE_TRCINFO_1(HasInstance, (3, (extern, BOOL_FAIL, HasInstance_tn, CONTEXT, THIS, JSVAL, 0, 0))) JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_INSTANCEOF() { jsval& r = stackval(-1); if (!JSVAL_IS_PRIMITIVE(r)) return call_imacro(instanceof_imacros.instanceof); return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DEBUGGER() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GOSUB() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_RETSUB() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_EXCEPTION() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_LINENO() { return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_CONDSWITCH() { return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_CASE() { strictEquality(true, true); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DEFAULT() { return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_EVAL() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ENUMELEM() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GETTER() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_SETTER() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DEFFUN() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DEFFUN_FC() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DEFCONST() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DEFVAR() { return JSRS_STOP; } jsatomid TraceRecorder::getFullIndex(ptrdiff_t pcoff) { jsatomid index = GET_INDEX(cx->fp->regs->pc + pcoff); index += atoms - cx->fp->script->atomMap.vector; return index; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_LAMBDA() { JSFunction* fun; JS_GET_SCRIPT_FUNCTION(cx->fp->script, getFullIndex(), fun); if (FUN_NULL_CLOSURE(fun) && OBJ_GET_PARENT(cx, FUN_OBJECT(fun)) == globalObj) { LIns *proto_ins; CHECK_STATUS(getClassPrototype(JSProto_Function, proto_ins)); LIns* args[] = { INS_CONSTPTR(globalObj), proto_ins, INS_CONSTPTR(fun), cx_ins }; LIns* x = lir->insCall(&js_NewNullClosure_ci, args); stack(0, x); return JSRS_CONTINUE; } return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_LAMBDA_FC() { JSFunction* fun; JS_GET_SCRIPT_FUNCTION(cx->fp->script, getFullIndex(), fun); LIns* scopeChain_ins = get(&cx->fp->argv[-2]); JS_ASSERT(scopeChain_ins); LIns* args[] = { scopeChain_ins, INS_CONSTPTR(fun), cx_ins }; LIns* call_ins = lir->insCall(&js_AllocFlatClosure_ci, args); guard(false, addName(lir->ins2(LIR_eq, call_ins, INS_CONSTPTR(0)), "guard(js_AllocFlatClosure)"), OOM_EXIT); stack(0, call_ins); JSUpvarArray *uva = JS_SCRIPT_UPVARS(fun->u.i.script); for (uint32 i = 0, n = uva->length; i < n; i++) { jsval v; LIns* upvar_ins = upvar(fun->u.i.script, uva, i, v); if (!upvar_ins) return JSRS_STOP; box_jsval(v, upvar_ins); LIns* dslots_ins = NULL; stobj_set_dslot(call_ins, i, dslots_ins, upvar_ins, "fc upvar"); } return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_CALLEE() { stack(0, get(&cx->fp->argv[-2])); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_SETLOCALPOP() { var(GET_SLOTNO(cx->fp->regs->pc), stack(-1)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_IFPRIMTOP() { // Traces are type-specialized, including null vs. object, so we need do // nothing here. The upstream unbox_jsval called after valueOf or toString // from an imacro (e.g.) will fork the trace for us, allowing us to just // follow along mindlessly :-). return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_SETCALL() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_TRY() { return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_FINALLY() { return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_NOP() { return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ARGSUB() { JSStackFrame* fp = cx->fp; if (!(fp->fun->flags & JSFUN_HEAVYWEIGHT)) { uintN slot = GET_ARGNO(fp->regs->pc); if (slot < fp->fun->nargs && slot < fp->argc && !fp->argsobj) { stack(0, get(&cx->fp->argv[slot])); return JSRS_CONTINUE; } } ABORT_TRACE("can't trace JSOP_ARGSUB hard case"); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ARGCNT() { if (!(cx->fp->fun->flags & JSFUN_HEAVYWEIGHT)) { stack(0, lir->insImmf(cx->fp->argc)); return JSRS_CONTINUE; } ABORT_TRACE("can't trace heavyweight JSOP_ARGCNT"); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_DefLocalFunSetSlot(uint32 slot, JSObject* obj) { JSFunction* fun = GET_FUNCTION_PRIVATE(cx, obj); if (FUN_NULL_CLOSURE(fun) && OBJ_GET_PARENT(cx, FUN_OBJECT(fun)) == globalObj) { LIns *proto_ins; CHECK_STATUS(getClassPrototype(JSProto_Function, proto_ins)); LIns* args[] = { INS_CONSTPTR(globalObj), proto_ins, INS_CONSTPTR(fun), cx_ins }; LIns* x = lir->insCall(&js_NewNullClosure_ci, args); var(slot, x); return JSRS_CONTINUE; } return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DEFLOCALFUN() { return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DEFLOCALFUN_FC() { return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GOTOX() { return record_JSOP_GOTO(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_IFEQX() { return record_JSOP_IFEQ(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_IFNEX() { return record_JSOP_IFNE(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ORX() { return record_JSOP_OR(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ANDX() { return record_JSOP_AND(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GOSUBX() { return record_JSOP_GOSUB(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_CASEX() { strictEquality(true, true); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DEFAULTX() { return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_TABLESWITCHX() { return record_JSOP_TABLESWITCH(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_LOOKUPSWITCHX() { return switchop(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_BACKPATCH() { return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_BACKPATCH_POP() { return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_THROWING() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_SETRVAL() { // If we implement this, we need to update JSOP_STOP. return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_RETRVAL() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GETGVAR() { jsval slotval = cx->fp->slots[GET_SLOTNO(cx->fp->regs->pc)]; if (JSVAL_IS_NULL(slotval)) return JSRS_CONTINUE; // We will see JSOP_NAME from the interpreter's jump, so no-op here. uint32 slot = JSVAL_TO_INT(slotval); if (!lazilyImportGlobalSlot(slot)) ABORT_TRACE("lazy import of global slot failed"); stack(0, get(&STOBJ_GET_SLOT(globalObj, slot))); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_SETGVAR() { jsval slotval = cx->fp->slots[GET_SLOTNO(cx->fp->regs->pc)]; if (JSVAL_IS_NULL(slotval)) return JSRS_CONTINUE; // We will see JSOP_NAME from the interpreter's jump, so no-op here. uint32 slot = JSVAL_TO_INT(slotval); if (!lazilyImportGlobalSlot(slot)) ABORT_TRACE("lazy import of global slot failed"); set(&STOBJ_GET_SLOT(globalObj, slot), stack(-1)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_INCGVAR() { jsval slotval = cx->fp->slots[GET_SLOTNO(cx->fp->regs->pc)]; if (JSVAL_IS_NULL(slotval)) // We will see JSOP_INCNAME from the interpreter's jump, so no-op here. return JSRS_CONTINUE; uint32 slot = JSVAL_TO_INT(slotval); if (!lazilyImportGlobalSlot(slot)) ABORT_TRACE("lazy import of global slot failed"); return inc(STOBJ_GET_SLOT(globalObj, slot), 1); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DECGVAR() { jsval slotval = cx->fp->slots[GET_SLOTNO(cx->fp->regs->pc)]; if (JSVAL_IS_NULL(slotval)) // We will see JSOP_INCNAME from the interpreter's jump, so no-op here. return JSRS_CONTINUE; uint32 slot = JSVAL_TO_INT(slotval); if (!lazilyImportGlobalSlot(slot)) ABORT_TRACE("lazy import of global slot failed"); return inc(STOBJ_GET_SLOT(globalObj, slot), -1); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GVARINC() { jsval slotval = cx->fp->slots[GET_SLOTNO(cx->fp->regs->pc)]; if (JSVAL_IS_NULL(slotval)) // We will see JSOP_INCNAME from the interpreter's jump, so no-op here. return JSRS_CONTINUE; uint32 slot = JSVAL_TO_INT(slotval); if (!lazilyImportGlobalSlot(slot)) ABORT_TRACE("lazy import of global slot failed"); return inc(STOBJ_GET_SLOT(globalObj, slot), 1, false); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GVARDEC() { jsval slotval = cx->fp->slots[GET_SLOTNO(cx->fp->regs->pc)]; if (JSVAL_IS_NULL(slotval)) // We will see JSOP_INCNAME from the interpreter's jump, so no-op here. return JSRS_CONTINUE; uint32 slot = JSVAL_TO_INT(slotval); if (!lazilyImportGlobalSlot(slot)) ABORT_TRACE("lazy import of global slot failed"); return inc(STOBJ_GET_SLOT(globalObj, slot), -1, false); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_REGEXP() { return JSRS_STOP; } // begin JS_HAS_XML_SUPPORT JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DEFXMLNS() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ANYNAME() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_QNAMEPART() { return record_JSOP_STRING(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_QNAMECONST() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_QNAME() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_TOATTRNAME() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_TOATTRVAL() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ADDATTRNAME() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ADDATTRVAL() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_BINDXMLNAME() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_SETXMLNAME() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_XMLNAME() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DESCENDANTS() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_FILTER() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ENDFILTER() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_TOXML() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_TOXMLLIST() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_XMLTAGEXPR() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_XMLELTEXPR() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_XMLOBJECT() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_XMLCDATA() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_XMLCOMMENT() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_XMLPI() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GETFUNNS() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_STARTXML() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_STARTXMLEXPR() { return JSRS_STOP; } // end JS_HAS_XML_SUPPORT JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_CALLPROP() { jsval& l = stackval(-1); JSObject* obj; LIns* obj_ins; LIns* this_ins; if (!JSVAL_IS_PRIMITIVE(l)) { obj = JSVAL_TO_OBJECT(l); obj_ins = get(&l); this_ins = obj_ins; // |this| for subsequent call } else { jsint i; debug_only_stmt(const char* protoname = NULL;) if (JSVAL_IS_STRING(l)) { i = JSProto_String; debug_only_stmt(protoname = "String.prototype";) } else if (JSVAL_IS_NUMBER(l)) { i = JSProto_Number; debug_only_stmt(protoname = "Number.prototype";) } else if (JSVAL_TAG(l) == JSVAL_BOOLEAN) { if (l == JSVAL_VOID) ABORT_TRACE("callprop on void"); guard(false, lir->ins2i(LIR_eq, get(&l), JSVAL_TO_PSEUDO_BOOLEAN(JSVAL_VOID)), MISMATCH_EXIT); i = JSProto_Boolean; debug_only_stmt(protoname = "Boolean.prototype";) } else { JS_ASSERT(JSVAL_IS_NULL(l) || JSVAL_IS_VOID(l)); ABORT_TRACE("callprop on null or void"); } if (!js_GetClassPrototype(cx, NULL, INT_TO_JSID(i), &obj)) ABORT_TRACE_ERROR("GetClassPrototype failed!"); obj_ins = INS_CONSTPTR(obj); debug_only_stmt(obj_ins = addName(obj_ins, protoname);) this_ins = get(&l); // use primitive as |this| } JSObject* obj2; jsuword pcval; CHECK_STATUS(test_property_cache(obj, obj_ins, obj2, pcval)); if (PCVAL_IS_NULL(pcval) || !PCVAL_IS_OBJECT(pcval)) ABORT_TRACE("callee is not an object"); JS_ASSERT(HAS_FUNCTION_CLASS(PCVAL_TO_OBJECT(pcval))); if (JSVAL_IS_PRIMITIVE(l)) { JSFunction* fun = GET_FUNCTION_PRIVATE(cx, PCVAL_TO_OBJECT(pcval)); if (!PRIMITIVE_THIS_TEST(fun, l)) ABORT_TRACE("callee does not accept primitive |this|"); } stack(0, this_ins); stack(-1, INS_CONSTPTR(PCVAL_TO_OBJECT(pcval))); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_DELDESC() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_UINT24() { stack(0, lir->insImmf(GET_UINT24(cx->fp->regs->pc))); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_INDEXBASE() { atoms += GET_INDEXBASE(cx->fp->regs->pc); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_RESETBASE() { atoms = cx->fp->script->atomMap.vector; return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_RESETBASE0() { atoms = cx->fp->script->atomMap.vector; return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_CALLELEM() { return record_JSOP_GETELEM(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_STOP() { JSStackFrame *fp = cx->fp; if (fp->imacpc) { // End of imacro, so return true to the interpreter immediately. The // interpreter's JSOP_STOP case will return from the imacro, back to // the pc after the calling op, still in the same JSStackFrame. atoms = fp->script->atomMap.vector; return JSRS_CONTINUE; } /* * We know falling off the end of a constructor returns the new object that * was passed in via fp->argv[-1], while falling off the end of a function * returns undefined. * * NB: we do not support script rval (eval, API users who want the result * of the last expression-statement, debugger API calls). */ if (fp->flags & JSFRAME_CONSTRUCTING) { JS_ASSERT(OBJECT_TO_JSVAL(fp->thisp) == fp->argv[-1]); rval_ins = get(&fp->argv[-1]); } else { rval_ins = INS_CONST(JSVAL_TO_PSEUDO_BOOLEAN(JSVAL_VOID)); } clearFrameSlotsFromCache(); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GETXPROP() { jsval& l = stackval(-1); if (JSVAL_IS_PRIMITIVE(l)) ABORT_TRACE("primitive-this for GETXPROP?"); JSObject* obj = JSVAL_TO_OBJECT(l); if (obj != cx->fp->scopeChain || obj != globalObj) return JSRS_STOP; jsval* vp; CHECK_STATUS(name(vp)); stack(-1, get(vp)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_CALLXMLNAME() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_TYPEOFEXPR() { return record_JSOP_TYPEOF(); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ENTERBLOCK() { JSObject* obj; JS_GET_SCRIPT_OBJECT(cx->fp->script, getFullIndex(0), obj); LIns* void_ins = INS_CONST(JSVAL_TO_PSEUDO_BOOLEAN(JSVAL_VOID)); for (int i = 0, n = OBJ_BLOCK_COUNT(cx, obj); i < n; i++) stack(i, void_ins); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_LEAVEBLOCK() { /* We mustn't exit the lexical block we began recording in. */ if (cx->fp->blockChain != lexicalBlock) return JSRS_CONTINUE; else return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GENERATOR() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_YIELD() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ARRAYPUSH() { uint32_t slot = GET_UINT16(cx->fp->regs->pc); JS_ASSERT(cx->fp->script->nfixed <= slot); JS_ASSERT(cx->fp->slots + slot < cx->fp->regs->sp - 1); jsval &arrayval = cx->fp->slots[slot]; JS_ASSERT(JSVAL_IS_OBJECT(arrayval)); JS_ASSERT(OBJ_IS_DENSE_ARRAY(cx, JSVAL_TO_OBJECT(arrayval))); LIns *array_ins = get(&arrayval); jsval &elt = stackval(-1); LIns *elt_ins = get(&elt); box_jsval(elt, elt_ins); LIns *args[] = { elt_ins, array_ins, cx_ins }; LIns *ok_ins = lir->insCall(&js_ArrayCompPush_ci, args); guard(false, lir->ins_eq0(ok_ins), OOM_EXIT); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_ENUMCONSTELEM() { return JSRS_STOP; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_LEAVEBLOCKEXPR() { LIns* v_ins = stack(-1); int n = -1 - GET_UINT16(cx->fp->regs->pc); stack(n, v_ins); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GETTHISPROP() { LIns* this_ins; CHECK_STATUS(getThis(this_ins)); /* * It's safe to just use cx->fp->thisp here because getThis() returns JSRS_STOP if thisp * is not available. */ CHECK_STATUS(getProp(cx->fp->thisp, this_ins)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GETARGPROP() { return getProp(argval(GET_ARGNO(cx->fp->regs->pc))); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_GETLOCALPROP() { return getProp(varval(GET_SLOTNO(cx->fp->regs->pc))); } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_INDEXBASE1() { atoms += 1 << 16; return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_INDEXBASE2() { atoms += 2 << 16; return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_INDEXBASE3() { atoms += 3 << 16; return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_CALLGVAR() { jsval slotval = cx->fp->slots[GET_SLOTNO(cx->fp->regs->pc)]; if (JSVAL_IS_NULL(slotval)) // We will see JSOP_CALLNAME from the interpreter's jump, so no-op here. return JSRS_CONTINUE; uint32 slot = JSVAL_TO_INT(slotval); if (!lazilyImportGlobalSlot(slot)) ABORT_TRACE("lazy import of global slot failed"); jsval& v = STOBJ_GET_SLOT(globalObj, slot); stack(0, get(&v)); stack(1, INS_CONSTPTR(NULL)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_CALLLOCAL() { uintN slot = GET_SLOTNO(cx->fp->regs->pc); stack(0, var(slot)); stack(1, INS_CONSTPTR(NULL)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_CALLARG() { uintN slot = GET_ARGNO(cx->fp->regs->pc); stack(0, arg(slot)); stack(1, INS_CONSTPTR(NULL)); return JSRS_CONTINUE; } /* Functions for use with JSOP_CALLBUILTIN. */ static JSBool ObjectToIterator(JSContext *cx, uintN argc, jsval *vp) { jsval *argv = JS_ARGV(cx, vp); JS_ASSERT(JSVAL_IS_INT(argv[0])); JS_SET_RVAL(cx, vp, JS_THIS(cx, vp)); return js_ValueToIterator(cx, JSVAL_TO_INT(argv[0]), &JS_RVAL(cx, vp)); } static JSObject* FASTCALL ObjectToIterator_tn(JSContext* cx, jsbytecode* pc, JSObject *obj, int32 flags) { jsval v = OBJECT_TO_JSVAL(obj); JSBool ok = js_ValueToIterator(cx, flags, &v); if (!ok) { js_SetBuiltinError(cx); return NULL; } return JSVAL_TO_OBJECT(v); } static JSBool CallIteratorNext(JSContext *cx, uintN argc, jsval *vp) { return js_CallIteratorNext(cx, JS_THIS_OBJECT(cx, vp), &JS_RVAL(cx, vp)); } static jsval FASTCALL CallIteratorNext_tn(JSContext* cx, jsbytecode* pc, JSObject* iterobj) { JSAutoTempValueRooter tvr(cx); JSBool ok = js_CallIteratorNext(cx, iterobj, tvr.addr()); if (!ok) { js_SetBuiltinError(cx); return JSVAL_ERROR_COOKIE; } return tvr.value(); } JS_DEFINE_TRCINFO_1(ObjectToIterator, (4, (static, OBJECT_FAIL, ObjectToIterator_tn, CONTEXT, PC, THIS, INT32, 0, 0))) JS_DEFINE_TRCINFO_1(CallIteratorNext, (3, (static, JSVAL_FAIL, CallIteratorNext_tn, CONTEXT, PC, THIS, 0, 0))) static const struct BuiltinFunctionInfo { JSTraceableNative *tn; int nargs; } builtinFunctionInfo[JSBUILTIN_LIMIT] = { {ObjectToIterator_trcinfo, 1}, {CallIteratorNext_trcinfo, 0}, {GetProperty_trcinfo, 1}, {GetElement_trcinfo, 1}, {SetProperty_trcinfo, 2}, {SetElement_trcinfo, 2}, {HasInstance_trcinfo, 1} }; JSObject * js_GetBuiltinFunction(JSContext *cx, uintN index) { JSRuntime *rt = cx->runtime; JSObject *funobj = rt->builtinFunctions[index]; if (!funobj) { /* Use NULL parent and atom. Builtin functions never escape to scripts. */ JS_ASSERT(index < JS_ARRAY_LENGTH(builtinFunctionInfo)); const BuiltinFunctionInfo *bfi = &builtinFunctionInfo[index]; JSFunction *fun = js_NewFunction(cx, NULL, JS_DATA_TO_FUNC_PTR(JSNative, bfi->tn), bfi->nargs, JSFUN_FAST_NATIVE | JSFUN_TRACEABLE, NULL, NULL); if (fun) { funobj = FUN_OBJECT(fun); STOBJ_CLEAR_PROTO(funobj); STOBJ_CLEAR_PARENT(funobj); JS_LOCK_GC(rt); if (!rt->builtinFunctions[index]) /* retest now that the lock is held */ rt->builtinFunctions[index] = funobj; else funobj = rt->builtinFunctions[index]; JS_UNLOCK_GC(rt); } } return funobj; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_CALLBUILTIN() { JSObject *obj = js_GetBuiltinFunction(cx, GET_INDEX(cx->fp->regs->pc)); if (!obj) ABORT_TRACE_ERROR("error in js_GetBuiltinFunction"); stack(0, get(&stackval(-1))); stack(-1, INS_CONSTPTR(obj)); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_INT8() { stack(0, lir->insImmf(GET_INT8(cx->fp->regs->pc))); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_INT32() { stack(0, lir->insImmf(GET_INT32(cx->fp->regs->pc))); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_LENGTH() { jsval& l = stackval(-1); if (JSVAL_IS_PRIMITIVE(l)) { if (!JSVAL_IS_STRING(l)) ABORT_TRACE("non-string primitive JSOP_LENGTH unsupported"); set(&l, lir->ins1(LIR_i2f, getStringLength(get(&l)))); return JSRS_CONTINUE; } JSObject* obj = JSVAL_TO_OBJECT(l); LIns* obj_ins = get(&l); LIns* v_ins; if (OBJ_IS_ARRAY(cx, obj)) { if (OBJ_IS_DENSE_ARRAY(cx, obj)) { if (!guardDenseArray(obj, obj_ins, BRANCH_EXIT)) { JS_NOT_REACHED("OBJ_IS_DENSE_ARRAY but not?!?"); return JSRS_STOP; } } else { if (!guardClass(obj, obj_ins, &js_SlowArrayClass, snapshot(BRANCH_EXIT))) ABORT_TRACE("can't trace length property access on non-array"); } v_ins = lir->ins1(LIR_i2f, stobj_get_fslot(obj_ins, JSSLOT_ARRAY_LENGTH)); } else { if (!OBJ_IS_NATIVE(obj)) ABORT_TRACE("can't trace length property access on non-array, non-native object"); return getProp(obj, obj_ins); } set(&l, v_ins); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_NEWARRAY() { LIns *proto_ins; CHECK_STATUS(getClassPrototype(JSProto_Array, proto_ins)); uint32 len = GET_UINT16(cx->fp->regs->pc); cx->fp->assertValidStackDepth(len); LIns* args[] = { lir->insImm(len), proto_ins, cx_ins }; LIns* v_ins = lir->insCall(&js_NewUninitializedArray_ci, args); guard(false, lir->ins_eq0(v_ins), OOM_EXIT); LIns* dslots_ins = NULL; uint32 count = 0; for (uint32 i = 0; i < len; i++) { jsval& v = stackval(int(i) - int(len)); if (v != JSVAL_HOLE) count++; LIns* elt_ins = get(&v); box_jsval(v, elt_ins); stobj_set_dslot(v_ins, i, dslots_ins, elt_ins, "set_array_elt"); } if (count > 0) stobj_set_fslot(v_ins, JSSLOT_ARRAY_COUNT, INS_CONST(count), "set_array_count"); stack(-int(len), v_ins); return JSRS_CONTINUE; } JS_REQUIRES_STACK JSRecordingStatus TraceRecorder::record_JSOP_HOLE() { stack(0, INS_CONST(JSVAL_TO_PSEUDO_BOOLEAN(JSVAL_HOLE))); return JSRS_CONTINUE; } JSRecordingStatus TraceRecorder::record_JSOP_LOOP() { return JSRS_CONTINUE; } #define DBG_STUB(OP) \ JS_REQUIRES_STACK JSRecordingStatus \ TraceRecorder::record_##OP() \ { \ ABORT_TRACE("can't trace " #OP); \ } DBG_STUB(JSOP_GETUPVAR_DBG) DBG_STUB(JSOP_CALLUPVAR_DBG) DBG_STUB(JSOP_DEFFUN_DBGFC) DBG_STUB(JSOP_DEFLOCALFUN_DBGFC) DBG_STUB(JSOP_LAMBDA_DBGFC) #ifdef JS_JIT_SPEW /* Prints information about entry typemaps and unstable exits for all peers at a PC */ void js_DumpPeerStability(JSTraceMonitor* tm, const void* ip, JSObject* globalObj, uint32 globalShape, uint32 argc) { Fragment* f; TreeInfo* ti; bool looped = false; unsigned length = 0; for (f = getLoop(tm, ip, globalObj, globalShape, argc); f != NULL; f = f->peer) { if (!f->vmprivate) continue; debug_only_printf(LC_TMStats, "fragment %p:\nENTRY: ", (void*)f); ti = (TreeInfo*)f->vmprivate; if (looped) JS_ASSERT(ti->nStackTypes == length); for (unsigned i = 0; i < ti->nStackTypes; i++) debug_only_printf(LC_TMStats, "S%d ", ti->stackTypeMap()[i]); for (unsigned i = 0; i < ti->nGlobalTypes(); i++) debug_only_printf(LC_TMStats, "G%d ", ti->globalTypeMap()[i]); debug_only_print0(LC_TMStats, "\n"); UnstableExit* uexit = ti->unstableExits; while (uexit != NULL) { debug_only_print0(LC_TMStats, "EXIT: "); JSTraceType* m = getFullTypeMap(uexit->exit); for (unsigned i = 0; i < uexit->exit->numStackSlots; i++) debug_only_printf(LC_TMStats, "S%d ", m[i]); for (unsigned i = 0; i < uexit->exit->numGlobalSlots; i++) debug_only_printf(LC_TMStats, "G%d ", m[uexit->exit->numStackSlots + i]); debug_only_print0(LC_TMStats, "\n"); uexit = uexit->next; } length = ti->nStackTypes; looped = true; } } #endif #ifdef MOZ_TRACEVIS FILE* traceVisLogFile = NULL; JS_FRIEND_API(bool) JS_StartTraceVis(const char* filename = "tracevis.dat") { if (traceVisLogFile) { // If we're currently recording, first we must stop. JS_StopTraceVis(); } traceVisLogFile = fopen(filename, "wb"); if (!traceVisLogFile) return false; return true; } JS_FRIEND_API(JSBool) js_StartTraceVis(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) { JSBool ok; if (argc > 0 && JSVAL_IS_STRING(argv[0])) { JSString *str = JSVAL_TO_STRING(argv[0]); char *filename = js_DeflateString(cx, str->chars(), str->length()); if (!filename) goto error; ok = JS_StartTraceVis(filename); JS_free(cx, filename); } else { ok = JS_StartTraceVis(); } if (ok) { fprintf(stderr, "started TraceVis recording\n"); return JS_TRUE; } error: JS_ReportError(cx, "failed to start TraceVis recording"); return JS_FALSE; } JS_FRIEND_API(bool) JS_StopTraceVis() { if (!traceVisLogFile) return false; fclose(traceVisLogFile); // not worth checking the result traceVisLogFile = NULL; return true; } JS_FRIEND_API(JSBool) js_StopTraceVis(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) { JSBool ok = JS_StopTraceVis(); if (ok) fprintf(stderr, "stopped TraceVis recording\n"); else JS_ReportError(cx, "TraceVis isn't running"); return ok; } #endif /* MOZ_TRACEVIS */ #define UNUSED(n) \ JS_REQUIRES_STACK bool \ TraceRecorder::record_JSOP_UNUSED##n() { \ JS_NOT_REACHED("JSOP_UNUSED" # n); \ return false; \ }