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Generate a list of interned global slots (gslots) when we process the tree header. This list is then used whenever we iterate over the native frame. This is faster and safer than looking up properties in the global object every time.

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This commit is contained in:
Andreas Gal 2008-07-15 01:53:39 -07:00
parent 84608819b9
commit 5848fd6694
2 changed files with 40 additions and 45 deletions
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81
js/src/jstracer.cpp
View File

@ -322,37 +322,17 @@ public:
frames that make up the native frame, including global variables and
frames consisting of rval, args, vars, and stack (except for the top-
level frame which does not have args or vars. */
#define FORALL_SLOTS_IN_PENDING_FRAMES(cx, entryFrame, currentFrame, code) \
#define FORALL_SLOTS_IN_PENDING_FRAMES(cx, ngslots, gslots, entryFrame, currentFrame, code) \
JS_BEGIN_MACRO \
DEF_VPNAME; \
JSObject* globalObj = JS_GetGlobalForObject(cx, cx->fp->scopeChain); \
unsigned n; \
jsval* vp; \
JSAtom** atoms = entryFrame->script->atomMap.vector; \
unsigned natoms = entryFrame->script->atomMap.length; \
SET_VPNAME("global"); \
for (n = 0; n < natoms; ++n) { \
JSAtom* atom = atoms[n]; \
if (!ATOM_IS_STRING(atom)) \
continue; \
jsid id = ATOM_TO_JSID(atom); \
JSObject* pobj; \
JSProperty *prop; \
JSScopeProperty* sprop; \
if (!js_LookupProperty(cx, globalObj, id, &pobj, &prop)) \
continue; /* XXX need to signal real error! */ \
if (!prop) \
continue; /* property not found -- string constant? */ \
if (pobj == globalObj) { \
sprop = (JSScopeProperty*) prop; \
if (SPROP_HAS_STUB_GETTER(sprop) && \
SPROP_HAS_STUB_SETTER(sprop)) { \
vp = &STOBJ_GET_SLOT(globalObj, sprop->slot); \
{ code; } \
INC_VPNUM(); \
} \
} \
JS_UNLOCK_OBJ(cx, pobj); \
for (n = 0; n < ngslots; ++n) { \
vp = &STOBJ_GET_SLOT(globalObj, gslots[n]); \
{ code; } \
INC_VPNUM(); \
} \
/* count the number of pending frames */ \
unsigned frames = 0; \
@ -394,7 +374,9 @@ class ExitFilter: public LirWriter
public:
ExitFilter(LirWriter *out, JSContext* cx, JSStackFrame* entryFrame,
Fragment* fragment, Tracker* tracker):
LirWriter(out), _cx(cx), _entryFrame(entryFrame), _fragment(fragment), _tracker(tracker)
LirWriter(out), _cx(cx),
_entryFrame(entryFrame),
_fragment(fragment), _tracker(tracker)
{
}
@ -413,7 +395,9 @@ public:
up until the entry scope. */
virtual LInsp insGuard(LOpcode v, LIns *c, SideExit *x) {
uint8* m = x->typeMap;
FORALL_SLOTS_IN_PENDING_FRAMES(_cx, _entryFrame, _cx->fp,
unsigned _ngslots = ((VMFragmentInfo*)_fragment->vmprivate)->ngslots;
uint16* _gslots = ((VMFragmentInfo*)_fragment->vmprivate)->gslots;
FORALL_SLOTS_IN_PENDING_FRAMES(_cx, _ngslots, _gslots, _entryFrame, _cx->fp,
*m++ = getStoreType(*vp));
return out->insGuard(v, c, x);
}
@ -450,6 +434,7 @@ TraceRecorder::TraceRecorder(JSContext* cx, Fragmento* fragmento, Fragment* _fra
#endif
fragment->calldepth = 0;
lirbuf = new (&gc) LirBuffer(fragmento, builtins);
fragment->lirbuf = lirbuf;
lir = lir_buf_writer = new (&gc) LirBufWriter(lirbuf);
@ -459,9 +444,11 @@ TraceRecorder::TraceRecorder(JSContext* cx, Fragmento* fragmento, Fragment* _fra
#endif
lir = cse_filter = new (&gc) CseFilter(lir, &gc);
lir = expr_filter = new (&gc) ExprFilter(lir);
lir = exit_filter = new (&gc) ExitFilter(lir, cx, entryFrame, fragment, &tracker);
lir = exit_filter = new (&gc) ExitFilter(lir, cx,
entryFrame, fragment, &tracker);
lir = func_filter = new (&gc) FuncFilter(lir, *this);
lir->ins0(LIR_trace);
if (fragment->vmprivate == NULL) {
/* calculate the number of globals we want to intern */
unsigned internableGlobals = findInternableGlobals(entryFrame, NULL);
@ -472,7 +459,7 @@ TraceRecorder::TraceRecorder(JSContext* cx, Fragmento* fragmento, Fragment* _fra
entryNativeFrameSlots * sizeof(uint8));
fragmentInfo = (VMFragmentInfo*)data->payload();
fragmentInfo->typeMap = (uint8*)(fragmentInfo + 1);
fragmentInfo->internedGlobalSlots = (uint16*)(fragmentInfo->typeMap +
fragmentInfo->gslots = (uint16*)(fragmentInfo->typeMap +
entryNativeFrameSlots * sizeof(uint8));
fragmentInfo->entryNativeFrameSlots = entryNativeFrameSlots;
fragmentInfo->nativeStackBase = (entryNativeFrameSlots -
@ -480,19 +467,22 @@ TraceRecorder::TraceRecorder(JSContext* cx, Fragmento* fragmento, Fragment* _fra
fragmentInfo->maxNativeFrameSlots = entryNativeFrameSlots;
fragmentInfo->maxCallDepth = 0;
/* setup the list of global properties we want to intern */
findInternableGlobals(entryFrame, fragmentInfo->internedGlobalSlots);
fragmentInfo->internedGlobalSlotCount = internableGlobals;
findInternableGlobals(entryFrame, fragmentInfo->gslots);
fragmentInfo->ngslots = internableGlobals;
fragmentInfo->globalShape = OBJ_SCOPE(globalObj)->shape;
/* build the entry type map */
uint8* m = fragmentInfo->typeMap;
/* remember the coerced type of each active slot in the type map */
FORALL_SLOTS_IN_PENDING_FRAMES(cx, entryFrame, entryFrame,
*m++ = getCoercedType(*vp));
FORALL_SLOTS_IN_PENDING_FRAMES(cx, fragmentInfo->ngslots, fragmentInfo->gslots,
entryFrame, entryFrame,
*m++ = getCoercedType(*vp)
);
} else {
/* recompiling the trace, we already have a fragment info structure */
fragmentInfo = (VMFragmentInfo*)fragment->vmprivate;
}
fragment->vmprivate = fragmentInfo;
fragment->state = lir->insImm8(LIR_param, Assembler::argRegs[0], 0);
fragment->param1 = lir->insImm8(LIR_param, Assembler::argRegs[1], 0);
fragment->sp = lir->insLoadi(fragment->state, offsetof(InterpState, sp));
@ -506,7 +496,8 @@ TraceRecorder::TraceRecorder(JSContext* cx, Fragmento* fragmento, Fragment* _fra
#endif
uint8* m = fragmentInfo->typeMap;
FORALL_SLOTS_IN_PENDING_FRAMES(cx, entryFrame, entryFrame,
FORALL_SLOTS_IN_PENDING_FRAMES(cx, fragmentInfo->ngslots, fragmentInfo->gslots,
entryFrame, entryFrame,
import(vp, *m, vpname, vpnum);
m++
);
@ -657,7 +648,8 @@ TraceRecorder::nativeFrameOffset(jsval* p) const
{
JSStackFrame* currentFrame = cx->fp;
size_t offset = 0;
FORALL_SLOTS_IN_PENDING_FRAMES(cx, entryFrame, currentFrame,
FORALL_SLOTS_IN_PENDING_FRAMES(cx, fragmentInfo->ngslots, fragmentInfo->gslots,
entryFrame, currentFrame,
if (vp == p) return offset;
offset += sizeof(double)
);
@ -791,12 +783,13 @@ box_jsval(JSContext* cx, jsval& v, uint8 t, double* slot)
/* Attempt to unbox the given JS frame into a native frame, checking along the way that the
supplied typemap holds. */
static bool
unbox(JSContext* cx, JSStackFrame* entryFrame, JSStackFrame* currentFrame, uint8* map, double* native)
unbox(JSContext* cx, unsigned ngslots, uint16* gslots,
JSStackFrame* entryFrame, JSStackFrame* currentFrame, uint8* map, double* native)
{
verbose_only(printf("unbox native@%p ", native);)
double* np = native;
uint8* mp = map;
FORALL_SLOTS_IN_PENDING_FRAMES(cx, entryFrame, currentFrame,
FORALL_SLOTS_IN_PENDING_FRAMES(cx, ngslots, gslots, entryFrame, currentFrame,
if (!unbox_jsval(*vp, *mp, np))
return false;
++mp; ++np;
@ -808,13 +801,14 @@ unbox(JSContext* cx, JSStackFrame* entryFrame, JSStackFrame* currentFrame, uint8
/* Box the given native frame into a JS frame. This only fails due to a hard error
(out of memory for example). */
static bool
box(JSContext* cx, JSStackFrame* entryFrame, JSStackFrame* currentFrame, uint8* map, double* native)
box(JSContext* cx, unsigned ngslots, uint16* gslots,
JSStackFrame* entryFrame, JSStackFrame* currentFrame, uint8* map, double* native)
{
verbose_only(printf("box native@%p ", native);)
double* np = native;
uint8* mp = map;
/* Root all string and object references first (we don't need to call the GC for this). */
FORALL_SLOTS_IN_PENDING_FRAMES(cx, entryFrame, currentFrame,
FORALL_SLOTS_IN_PENDING_FRAMES(cx, ngslots, gslots, entryFrame, currentFrame,
if ((*mp == JSVAL_STRING || *mp == JSVAL_OBJECT) && !box_jsval(cx, *vp, *mp, np))
return false;
++mp; ++np
@ -824,7 +818,7 @@ box(JSContext* cx, JSStackFrame* entryFrame, JSStackFrame* currentFrame, uint8*
but everything is rooted now (all strings/objects and all doubles we already boxed). */
np = native;
mp = map;
FORALL_SLOTS_IN_PENDING_FRAMES(cx, entryFrame, currentFrame,
FORALL_SLOTS_IN_PENDING_FRAMES(cx, ngslots, gslots, entryFrame, currentFrame,
if (!box_jsval(cx, *vp, *mp, np))
return false;
++mp; ++np
@ -988,7 +982,8 @@ TraceRecorder::checkType(jsval& v, uint8& t)
bool
TraceRecorder::verifyTypeStability(JSStackFrame* entryFrame, JSStackFrame* currentFrame, uint8* m)
{
FORALL_SLOTS_IN_PENDING_FRAMES(cx, entryFrame, currentFrame,
FORALL_SLOTS_IN_PENDING_FRAMES(cx, fragmentInfo->ngslots, fragmentInfo->gslots,
entryFrame, currentFrame,
if (!checkType(*vp, *m))
return false;
++m
@ -1161,7 +1156,7 @@ js_LoopEdge(JSContext* cx)
#ifdef DEBUG
*(uint64*)&native[fi->maxNativeFrameSlots] = 0xdeadbeefdeadbeefLL;
#endif
if (!unbox(cx, cx->fp, cx->fp, fi->typeMap, native)) {
if (!unbox(cx, fi->ngslots, fi->gslots, cx->fp, cx->fp, fi->typeMap, native)) {
#ifdef DEBUG
printf("typemap mismatch, skipping trace.\n");
#endif
@ -1192,7 +1187,7 @@ js_LoopEdge(JSContext* cx)
state.sp,
(rdtsc() - start));
#endif
box(cx, cx->fp, cx->fp, lr->exit->typeMap, native);
box(cx, fi->ngslots, fi->gslots, cx->fp, cx->fp, lr->exit->typeMap, native);
#ifdef DEBUG
JS_ASSERT(*(uint64*)&native[fi->maxNativeFrameSlots] == 0xdeadbeefdeadbeefLL);
#endif

4
js/src/jstracer.h
View File

@ -92,9 +92,9 @@ struct VMFragmentInfo {
size_t nativeStackBase;
unsigned maxCallDepth;
uint32 globalShape;
unsigned internedGlobalSlotCount;
unsigned ngslots;
uint8 *typeMap;
uint16 *internedGlobalSlots;
uint16 *gslots;
};
extern struct nanojit::CallInfo builtins[];