/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=8 sw=4 et tw=79:
 *
 * ***** 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 <brendan@mozilla.org>
 *
 * Contributor(s):
 *   Andreas Gal <gal@mozilla.com>
 *
 * 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 <math.h>

#include "nanojit/avmplus.h"
#include "nanojit/nanojit.h"
#include "jsarray.h"
#include "jsbool.h"
#include "jstracer.h"
#include "jscntxt.h"
#include "jsscript.h"
#include "jsprf.h"
#include "jsinterp.h"
#include "jsscope.h"

using namespace avmplus;
using namespace nanojit;

static GC gc = GC();
static avmplus::AvmCore* core = new (&gc) avmplus::AvmCore();

Tracker::Tracker()
{
    pagelist = 0;
}

Tracker::~Tracker()
{
    clear();
}

long
Tracker::getPageBase(const void* v) const
{
    return ((long)v) & (~(NJ_PAGE_SIZE-1));
}

struct Tracker::Page*
Tracker::findPage(const void* v) const
{
    long 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) {
    long base = getPageBase(v);
    struct Tracker::Page* p = (struct Tracker::Page*)
        GC::Alloc(sizeof(struct Tracker::Page) + (NJ_PAGE_SIZE >> 2) * sizeof(LInsp));
    p->base = base;
    p->next = pagelist;
    pagelist = p;
    return p;
}

void
Tracker::clear()
{
    while (pagelist) {
        Page* p = pagelist;
        pagelist = pagelist->next;
        GC::Free(p);
    }
}

LIns*
Tracker::get(const void* v) const
{
    struct Tracker::Page* p = findPage(v);
    JS_ASSERT(p != 0); /* we must have a page for the slot we are looking for */
    LIns* i = p->map[(((long)v) & 0xfff) >> 2];
    JS_ASSERT(i != 0);
    return i;
}

void
Tracker::set(const void* v, LIns* ins)
{
    struct Tracker::Page* p = findPage(v);
    if (!p)
        p = addPage(v);
    p->map[(((long)v) & 0xfff) >> 2] = ins;
}

#define LO ARGSIZE_LO
#define F  ARGSIZE_F
#define Q  ARGSIZE_Q

#ifdef DEBUG
#define NAME(op) ,#op
#else
#define NAME(op)
#endif

#define builtin_DoubleToECMAInt32 js_DoubleToECMAInt32
#define builtin_DoubleToECMAUint32 js_DoubleToECMAUint32
#define builtin_CompareStrings js_CompareStrings

jsint builtin_StringLength(JSString* s)
{
    return JSSTRING_LENGTH(s);
}

jsdouble builtin_dmod(jsdouble a, jsdouble b)
{
    if (b == 0.0) { 
        jsdpun u;
        u.s.hi = JSDOUBLE_HI32_EXPMASK | JSDOUBLE_HI32_MANTMASK;
        u.s.lo = 0xffffffff;
        return u.d;      
    }
    jsdouble r;
#ifdef XP_WIN
    /* Workaround MS fmod bug where 42 % (1/0) => NaN, not 42. */
    if (!(JSDOUBLE_IS_FINITE(a) && JSDOUBLE_IS_INFINITE(b)))
        r = a;
    else
#endif
        r = fmod(a, b);
    return r;
}

#define BUILTIN1(op, at0, atr, tr, t0, cse, fold) \
    { (intptr_t)&builtin_##op, (at0 << 2) | atr, cse, fold NAME(op) },
#define BUILTIN2(op, at0, at1, atr, tr, t0, t1, cse, fold) \
    { (intptr_t)&builtin_##op, (at0 << 4) | (at1 << 2) | atr, cse, fold NAME(op) },
#define BUILTIN3(op, at0, at1, at2, atr, tr, t0, t1, t2, cse, fold) \
    { (intptr_t)&builtin_##op, (at0 << 6) | (at1 << 4) | (at2 << 2) | atr, cse, fold NAME(op) },

static struct CallInfo builtins[] = {
#include "builtins.tbl"
};

#undef NAME
#undef BUILTIN1
#undef BUILTIN2
#undef BUILTIN3

static void
buildTypeMap(JSStackFrame* entryFrame, JSStackFrame* fp, JSFrameRegs& regs, char* m);

TraceRecorder::TraceRecorder(JSContext* cx, Fragmento* fragmento, Fragment* _fragment) 
{
    this->cx = cx;
    this->fragment = _fragment;
    entryFrame = cx->fp;
    entryRegs.pc = entryFrame->regs->pc;
    entryRegs.sp = entryFrame->regs->sp;

    printf("entryRegs.pc=%p opcode=%d\n", entryRegs.pc, *entryRegs.pc);
    
    fragment->calldepth = 0;
    lirbuf = new (&gc) LirBuffer(fragmento, builtins);
    fragment->lirbuf = lirbuf;
    lir = lir_buf_writer = new (&gc) LirBufWriter(lirbuf);
#ifdef DEBUG    
    lirbuf->names = new (&gc) LirNameMap(&gc, builtins, fragmento->labels);
    lir = verbose_filter = new (&gc) VerboseWriter(&gc, lir, lirbuf->names);
#endif    
    lir = cse_filter = new (&gc) CseFilter(lir, &gc);
    lir = expr_filter = new (&gc) ExprFilter(lir);
    lir->ins0(LIR_trace);
    /* generate the entry map and stash it in the trace */
    entryNativeFrameSlots = nativeFrameSlots(entryFrame, entryRegs);
    maxNativeFrameSlots = entryNativeFrameSlots;
    LIns* data = lir_buf_writer->skip(sizeof(VMFragmentInfo) + entryNativeFrameSlots * sizeof(char));
    fragmentInfo = (VMFragmentInfo*)data->payload();
    buildTypeMap(entryFrame, entryFrame, entryRegs, fragmentInfo->typeMap);
    fragmentInfo->nativeStackBase = nativeFrameOffset(&cx->fp->spbase[0]);
    fragment->vmprivate = fragmentInfo;
    fragment->param0 = lir->insImm8(LIR_param, Assembler::argRegs[0], 0);
    fragment->param1 = lir->insImm8(LIR_param, Assembler::argRegs[1], 0);
    fragment->sp = lir->insLoadi(fragment->param0, offsetof(InterpState, sp));
    cx_ins = lir->insLoadi(fragment->param0, offsetof(InterpState, cx));
#ifdef DEBUG
    lirbuf->names->addName(fragment->param0, "state");
    lirbuf->names->addName(fragment->sp, "sp");
    lirbuf->names->addName(cx_ins, "cx");
#endif
    
    JSStackFrame* fp = cx->fp;
    unsigned n;
    for (n = 0; n < fp->argc; ++n)
        import(&fp->argv[n], "arg", n);
    for (n = 0; n < fp->nvars; ++n) 
        import(&fp->vars[n], "var", n);
    for (n = 0; n < (unsigned)(fp->regs->sp - fp->spbase); ++n)
        import(&fp->spbase[n], "stack", n);
}

TraceRecorder::~TraceRecorder()
{
#ifdef DEBUG
    delete lirbuf->names;
    delete verbose_filter;
#endif    
    delete cse_filter;
    delete expr_filter;
    delete lir_buf_writer;
}

/* Determine the current call depth (starting with the entry frame.) */
unsigned
TraceRecorder::calldepth() const
{
    JSStackFrame* fp = cx->fp;
    unsigned depth = 0;
    while (fp != entryFrame) {
        ++depth;
        fp = fp->down;
    }
    return depth;
}

/* Find the frame that this address belongs to (if any). */
JSStackFrame*
TraceRecorder::findFrame(void* p) const
{
    JSStackFrame* fp = cx->fp;
    while (1) {
        if ((p >= &fp->argv[0] && p < &fp->argv[fp->argc]) ||
            (p >= &fp->vars[0] && p < &fp->vars[fp->nvars]) ||
            (p >= &fp->spbase[0] && p < &fp->spbase[fp->script->depth]))
            return fp;
        if (fp == entryFrame)
            return NULL;
        fp = fp->down;
    }
}

/* Determine whether an address is part of a currently active frame. */
bool
TraceRecorder::onFrame(void* p) const
{
    return findFrame(p) != NULL;
}

/* 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. */
unsigned
TraceRecorder::nativeFrameSlots(JSStackFrame* fp, JSFrameRegs& regs) const
{
    unsigned size = 0;
    while (1) {
        size += fp->argc + fp->nvars + (regs.sp - fp->spbase);
        if (fp == entryFrame)
            return size;
        fp = fp->down;
    } 
}

/* Determine the offset in the native frame (marshal) for an address
   that is part of a currently active frame. */
unsigned
TraceRecorder::nativeFrameOffset(void* p) const
{
    JSStackFrame* fp = findFrame(p);
    JS_ASSERT(fp != NULL); // must be on the frame somewhere
    unsigned offset = 0;
    if (p >= &fp->argv[0] && p < &fp->argv[fp->argc])
        offset = unsigned((jsval*)p - &fp->argv[0]);
    else if (p >= &fp->vars[0] && p < &fp->vars[fp->nvars])
        offset = (fp->argc + unsigned((jsval*)p - &fp->vars[0]));
    else {
        JS_ASSERT((p >= &fp->spbase[0] && p < &fp->spbase[fp->script->depth]));
        offset = (fp->argc + fp->nvars + unsigned((jsval*)p - &fp->spbase[0]));
    }
    if (fp != entryFrame) 
        offset += nativeFrameSlots(fp->down, *fp->regs);
    return offset * sizeof(double);
}

/* Track the maximum number of native frame slots we need during 
   execution. */
void
TraceRecorder::trackNativeFrameUse(unsigned slots)
{
    if (slots > maxNativeFrameSlots)
        maxNativeFrameSlots = slots;
}

/* Return the tag of a jsval. Doubles are checked whether they actually 
   represent an int, in which case we treat them as JSVAL_INT. */
static inline int getType(jsval v)
{
    if (JSVAL_IS_INT(v))
        return JSVAL_INT;
    jsint i;
    if (JSVAL_IS_DOUBLE(v) && JSDOUBLE_IS_INT(*JSVAL_TO_DOUBLE(v), i))
        return JSVAL_INT;
    return JSVAL_TAG(v);
}   

static inline bool isInt(jsval v)
{
    return getType(v) == JSVAL_INT;
}

static inline bool isDouble(jsval v)
{
    return (getType(v) == JSVAL_DOUBLE) && !isInt(v);
}

static inline jsint asInt(jsval v)
{
    JS_ASSERT(isInt(v));
    if (JSVAL_IS_DOUBLE(v)) 
        return js_DoubleToECMAInt32(*JSVAL_TO_DOUBLE(v));
    return JSVAL_TO_INT(v);
}

/* Write out a type map for the current scopes and all outer scopes,
   up until the entry scope. */
static void
buildTypeMap(JSStackFrame* entryFrame, JSStackFrame* fp, JSFrameRegs& regs, char* m)
{
    if (fp != entryFrame)
        buildTypeMap(entryFrame, fp->down, *fp->down->regs, m);
    for (unsigned n = 0; n < fp->argc; ++n)
        *m++ = getType(fp->argv[n]);
    for (unsigned n = 0; n < fp->nvars; ++n)
        *m++ = getType(fp->vars[n]);
    for (jsval* sp = fp->spbase; sp < regs.sp; ++sp)
        *m++ = getType(*sp);
}

/* Make sure that all loop-carrying values have a stable type. */
static bool
verifyTypeStability(JSStackFrame* entryFrame, JSStackFrame* fp, JSFrameRegs& regs, char* m)
{
    if (fp != entryFrame)
        verifyTypeStability(entryFrame, fp->down, *fp->down->regs, m);
    for (unsigned n = 0; n < fp->argc; ++n)
        if (*m++ != getType(fp->argv[n]))
            return false;
    for (unsigned n = 0; n < fp->nvars; ++n)
        if (*m++ != getType(fp->vars[n]))
            return false;
    for (jsval* sp = fp->spbase; sp < regs.sp; ++sp)
        if (*m++ != getType(*sp))
            return false;
    return true;
}

/* Unbox a jsval into a slot. Slots are wide enough to hold double values 
   directly (instead of storing a pointer to them). */
static bool
unbox_jsval(jsval v, int t, double* slot)
{
    if (t != getType(v))
        return false;
    switch (t) {
    case JSVAL_BOOLEAN:
        *(bool*)slot = JSVAL_TO_BOOLEAN(v);
        break;
    case JSVAL_INT:
        *(jsint*)slot = asInt(v);
        break;
    case JSVAL_DOUBLE:
        *(jsdouble*)slot = *JSVAL_TO_DOUBLE(v);
        break;
    case JSVAL_STRING:
        *(JSString**)slot = JSVAL_TO_STRING(v);
        break;
    default:
        JS_ASSERT(JSVAL_IS_GCTHING(v));
        *(void**)slot = JSVAL_TO_GCTHING(v);
    }
    return true;
}

/* 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 bool 
box_jsval(JSContext* cx, jsval* vp, int t, double* slot)
{
    switch (t) {
    case JSVAL_BOOLEAN:
        *vp = BOOLEAN_TO_JSVAL(*(bool*)slot);
        break;
    case JSVAL_INT:
        jsint i = *(jsint*)slot;
        if (INT_FITS_IN_JSVAL(i))
            *vp = INT_TO_JSVAL(i);
        else
            return js_NewDoubleInRootedValue(cx, (jsdouble)i, vp);
        break;
    case JSVAL_DOUBLE:
        return js_NewDoubleInRootedValue(cx, *slot, vp);
    case JSVAL_STRING:
        *vp = STRING_TO_JSVAL(*(JSString**)slot);
        break;
    default:
        JS_ASSERT(t == JSVAL_OBJECT);
        *vp = OBJECT_TO_JSVAL(*(JSObject**)slot);
        break;
    }
    return true;
}

/* Attempt to unbox the given JS frame into a native frame, checking
   along the way that the supplied typemap holds. */
static bool
unbox(JSStackFrame* fp, JSFrameRegs& regs, char* m, double* native)
{
    jsval* vp;
    for (vp = fp->argv; vp < fp->argv + fp->argc; ++vp)
        if (!unbox_jsval(*vp, (JSType)*m++, native++))
            return false;
    for (vp = fp->vars; vp < fp->vars + fp->nvars; ++vp)
        if (!unbox_jsval(*vp, (JSType)*m++, native++))
            return false;
    for (vp = fp->spbase; vp < regs.sp; ++vp)
        if (!unbox_jsval(*vp, (JSType)*m++, native++))
            return false;
    return true;
}

/* Attempt to unbox the given JS frame into a native frame, checking
   along the way that the supplied typemap holds. */
static bool
box(JSContext* cx, JSStackFrame* fp, JSFrameRegs& regs, char* m, double* native)
{
    jsval* vp;
    for (vp = fp->argv; vp < fp->argv + fp->argc; ++vp)
        if (!box_jsval(cx, vp, (JSType)*m++, native++))
            return false;
    for (vp = fp->vars; vp < fp->vars + fp->nvars; ++vp)
        if (!box_jsval(cx, vp, (JSType)*m++, native++))
            return false;
    for (vp = fp->spbase; vp < regs.sp; ++vp)
        if (!box_jsval(cx, vp, (JSType)*m++, native++))
            return false;
    return true;
}

/* Emit load instructions onto the trace that read the initial stack state. */
void 
TraceRecorder::import(jsval* p, char *prefix, int index)
{
    JS_ASSERT(onFrame(p));
    LIns *ins = lir->insLoad(isDouble(*p) ? LIR_ldq : LIR_ld,
            fragment->sp, -fragmentInfo->nativeStackBase + nativeFrameOffset(p) + 8);
    tracker.set(p, ins);
#ifdef DEBUG
    if (prefix) {
        char name[16];
        JS_ASSERT(strlen(prefix) < 10);
        JS_snprintf(name, sizeof name, "$%s%d", prefix, index);
        lirbuf->names->addName(ins, name);
    }
#endif

}

/* Update the tracker. If the value is part of any argv/vars/stack of any 
   currently active frame (onFrame), then issue a write back store. */
void 
TraceRecorder::set(void* p, LIns* i)
{
    tracker.set(p, i);
    if (onFrame(p)) 
        lir->insStorei(i, fragment->sp, -fragmentInfo->nativeStackBase + nativeFrameOffset(p) + 8);
}

LIns* 
TraceRecorder::get(void* p)
{
    return tracker.get(p);
}

SideExit*
TraceRecorder::snapshot()
{
    /* generate the entry map and stash it in the trace */
    unsigned slots = nativeFrameSlots(cx->fp, *cx->fp->regs);
    trackNativeFrameUse(slots);
    LIns* data = lir_buf_writer->skip(sizeof(VMSideExitInfo) + slots * sizeof(char));
    VMSideExitInfo* si = (VMSideExitInfo*)data->payload();
    buildTypeMap(entryFrame, cx->fp, *cx->fp->regs, si->typeMap);
    /* setup side exit structure */
    memset(&exit, 0, sizeof(exit));
#ifdef DEBUG    
    exit.from = fragment;
#endif    
    exit.calldepth = calldepth();
    exit.sp_adj = (cx->fp->regs->sp - entryRegs.sp) * sizeof(double);
    exit.ip_adj = cx->fp->regs->pc - entryRegs.pc;
    exit.vmprivate = si;
    return &exit;
}

void
TraceRecorder::guard(bool expected, LIns* cond)
{
    lir->insGuard(expected ? LIR_xf : LIR_xt, 
            cond, 
            snapshot());
}

void
TraceRecorder::closeLoop(Fragmento* fragmento)
{
    if (!verifyTypeStability(entryFrame, entryFrame, entryRegs, fragmentInfo->typeMap)) {
#ifdef DEBUG
        printf("Trace rejected: unstable loop variables.\n");
#endif        
        return;
    }
    fragment->lastIns = lir->ins0(LIR_loop);
    ((VMFragmentInfo*)fragment->vmprivate)->maxNativeFrameSlots = maxNativeFrameSlots;
    compile(fragmento->assm(), fragment);
}

bool
TraceRecorder::loopEdge(JSContext* cx)
{
    if (cx->fp->regs->pc == entryRegs.pc) {
        closeLoop(JS_TRACE_MONITOR(cx).fragmento);
        return false; /* done recording */
    }
    return false; /* abort recording */
}

void 
js_DeleteRecorder(JSContext* cx)
{
    JSTraceMonitor* tm = &JS_TRACE_MONITOR(cx);
    delete tm->recorder;
    tm->recorder = NULL;
}

bool
js_LoopEdge(JSContext* cx)
{
    JSTraceMonitor* tm = &JS_TRACE_MONITOR(cx);
    
    /* is the recorder currently active? */
    if (tm->recorder) {
        if (tm->recorder->loopEdge(cx)) 
            return true; /* keep recording */
        js_DeleteRecorder(cx);
        return false; /* done recording */
    }
    
    if (!tm->fragmento) {
        Fragmento* fragmento = new (&gc) Fragmento(core);
#ifdef DEBUG        
        fragmento->labels = new (&gc) LabelMap(core, NULL);
#endif        
        fragmento->assm()->setCallTable(builtins);
        tm->fragmento = fragmento;
    }

    InterpState state;
    state.ip = (FOpcodep)cx->fp->regs->pc;
    
    Fragment* f = tm->fragmento->getLoop(state);
    
    if (!f->code()) {
        tm->recorder = new (&gc) TraceRecorder(cx, tm->fragmento, f);
        return true; /* start recording */
    }

    /* execute previously recorded race */
    VMFragmentInfo* fi = (VMFragmentInfo*)f->vmprivate;
    double native[fi->maxNativeFrameSlots+1];
#ifdef DEBUG
    *(uint64*)&native[fi->maxNativeFrameSlots] = 0xdeadbeefdeadbeefLL;
#endif    
    unbox(cx->fp, *cx->fp->regs, fi->typeMap, native);
    double* entry_sp = &native[fi->nativeStackBase/sizeof(double) + (cx->fp->regs->sp - cx->fp->spbase - 1)];
    state.sp = (void*)entry_sp;
    state.rp = NULL;
    state.f = NULL;
    state.cx = cx;
    union { NIns *code; GuardRecord* (FASTCALL *func)(InterpState*, Fragment*); } u;
    u.code = f->code();
    GuardRecord* lr = u.func(&state, NULL);
    cx->fp->regs->sp += (((double*)state.sp - entry_sp));
    cx->fp->regs->pc = (jsbytecode*)state.ip;
    box(cx, cx->fp, *cx->fp->regs, ((VMSideExitInfo*)lr->vmprivate)->typeMap, native);
#ifdef DEBUG
    JS_ASSERT(*(uint64*)&native[fi->maxNativeFrameSlots] == 0xdeadbeefdeadbeefLL);
#endif    
    
    return false; /* continue with regular interpreter */
}

void
js_AbortRecording(JSContext* cx, const char* reason)
{
#ifdef DEBUG
    printf("Abort recording: %s.\n", reason);
#endif        
    JSTraceMonitor* tm = &JS_TRACE_MONITOR(cx);
    JS_ASSERT(tm->recorder != NULL);
    js_DeleteRecorder(cx);
}

jsval&
TraceRecorder::argval(unsigned n) const
{
    JS_ASSERT((n >= 0) && (n <= cx->fp->argc));
    return cx->fp->argv[n];
}

jsval&
TraceRecorder::varval(unsigned n) const
{
    JS_ASSERT((n >= 0) && (n <= cx->fp->nvars));
    return cx->fp->vars[n];
}

jsval&
TraceRecorder::stackval(int n) const
{
    JS_ASSERT((cx->fp->regs->sp + n < cx->fp->spbase + cx->fp->script->depth) && (cx->fp->regs->sp + n >= cx->fp->spbase));
    return cx->fp->regs->sp[n];
}

LIns*
TraceRecorder::arg(unsigned n) 
{
    return get(&argval(n));
}

void
TraceRecorder::arg(unsigned n, LIns* i)
{
    set(&argval(n), i);
}

LIns*
TraceRecorder::var(unsigned n) 
{
    return get(&varval(n));
}

void
TraceRecorder::var(unsigned n, LIns* i)
{
    set(&varval(n), i);
}

LIns*
TraceRecorder::stack(int n)
{
    return get(&stackval(n));
}

void
TraceRecorder::stack(int n, LIns* i) 
{
    set(&stackval(n), i);
}

bool
TraceRecorder::inc(jsval& v, jsint incr, bool pre)
{
    if (isInt(v)) {
        LIns* before = get(&v);
        LIns* after = lir->ins2i(LIR_add, before, incr);
        guard(false, lir->ins1(LIR_ov, after));
        set(&v, after);
        stack(0, pre ? after : before);
        return true;
    }
    return false;
}

bool
TraceRecorder::cmp(LOpcode op, bool negate)
{
    jsval& r = stackval(-1);
    jsval& l = stackval(-2);
    if (isInt(l) && isInt(r)) {
        LIns* x = lir->ins2(op, get(&l), get(&r));
        if (negate)
            x = lir->ins2i(LIR_eq, x, 0);
        bool cond;
        switch (op) {
        case LIR_lt:
            cond = asInt(l) < asInt(r); 
            break;
        case LIR_gt:
            cond = asInt(l) > asInt(r); 
            break;
        case LIR_le:
            cond = asInt(l) <= asInt(r); 
            break;
        case LIR_ge:
            cond = asInt(l) >= asInt(r); 
            break;
        default:
            JS_ASSERT(cond == LIR_eq);
            cond = asInt(l) == asInt(r);
            break;
        }
        /* The interpreter fuses comparisons and the following branch,
           so we have to do that here as well. */
        if (cx->fp->regs->pc[1] == ::JSOP_IFEQ)
            guard(!cond, x);
        else if (cx->fp->regs->pc[1] == ::JSOP_IFNE)
            guard(cond, x);
        /* We update the stack after the guard. This is safe since
           the guard bails out at the comparison and the interpreter
           will this 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 true;
    }
    return false;
}

bool
TraceRecorder::ibinary(LOpcode op, bool ov)
{
    jsval& r = stackval(-1);
    jsval& l = stackval(-2);
    if (isInt(l) && isInt(r)) {
        LIns* result = lir->ins2(op, get(&l), get(&r));
        if (ov)
            guard(false, lir->ins1(LIR_ov, result));
        set(&l, result);
        return true;
    }
    return false;
}

bool
TraceRecorder::map_is_native(JSObjectMap* map, LIns* map_ins)
{
    LIns* ops = lir->insLoadi(map_ins, offsetof(JSObjectMap, ops));
    if (map->ops == &js_ObjectOps) {
        guard(true, lir->ins2i(LIR_eq, ops, (long)&js_ObjectOps));
        return true;
    }
    LIns* n = lir->insLoadi(ops, offsetof(JSObjectOps, newObjectMap));
    if (map->ops->newObjectMap == js_ObjectOps.newObjectMap) {
        guard(true, lir->ins2i(LIR_eq, n, (long)js_ObjectOps.newObjectMap));
        return true;
    }
    return false;
}

LIns* 
TraceRecorder::loadObjectClass(LIns* objld)
{
    return lir->ins2(LIR_and,
                     lir->insLoadi(objld,
                                   offsetof(JSObject, fslots[JSSLOT_CLASS])),
                     lir->insImmPtr((void *)~3));
}

bool TraceRecorder::JSOP_INTERRUPT()
{
    return false;
}
bool TraceRecorder::JSOP_PUSH()
{
    return false;
}
bool TraceRecorder::JSOP_POPV()
{
    return false;
}
bool TraceRecorder::JSOP_ENTERWITH()
{
    return false;
}
bool TraceRecorder::JSOP_LEAVEWITH()
{
    return false;
}
bool TraceRecorder::JSOP_RETURN()
{
    return false;
}
bool TraceRecorder::JSOP_GOTO()
{
    return false;
}
bool TraceRecorder::JSOP_IFEQ()
{
    return false;
}
bool TraceRecorder::JSOP_IFNE()
{
    return false;
}
bool TraceRecorder::JSOP_ARGUMENTS()
{
    return false;
}
bool TraceRecorder::JSOP_FORARG()
{
    return false;
}
bool TraceRecorder::JSOP_FORVAR()
{
    return false;
}
bool TraceRecorder::JSOP_DUP()
{
    return false;
}
bool TraceRecorder::JSOP_DUP2()
{
    return false;
}
bool TraceRecorder::JSOP_SETCONST()
{
    return false;
}
bool TraceRecorder::JSOP_BITOR()
{
    return ibinary(LIR_or);
}
bool TraceRecorder::JSOP_BITXOR()
{
    return ibinary(LIR_xor);
}
bool TraceRecorder::JSOP_BITAND()
{
    return ibinary(LIR_and);
}
bool TraceRecorder::JSOP_EQ()
{
    return cmp(LIR_eq);
}
bool TraceRecorder::JSOP_NE()
{
    return cmp(LIR_eq, true);
}
bool TraceRecorder::JSOP_LT()
{
    return cmp(LIR_lt);
}
bool TraceRecorder::JSOP_LE()
{
    return cmp(LIR_le);
}
bool TraceRecorder::JSOP_GT()
{
    return cmp(LIR_gt);
}
bool TraceRecorder::JSOP_GE()
{
    return cmp(LIR_ge);
}
bool TraceRecorder::JSOP_LSH()
{
    return ibinary(LIR_lsh, false);
}
bool TraceRecorder::JSOP_RSH()
{
    return ibinary(LIR_rsh, false);
}
bool TraceRecorder::JSOP_URSH()
{
    return ibinary(LIR_ush, false);
}
bool TraceRecorder::JSOP_ADD()
{
    jsval& r = stackval(-1);
    jsval& l = stackval(-2);
    if (isInt(l) && isInt(r)) {
        LIns* result = lir->ins2(LIR_add, get(&l), get(&r));
        guard(false, lir->ins1(LIR_ov, result));
        set(&l, result);
        return true;
    }
    return false;
}
bool TraceRecorder::JSOP_SUB()
{
    return ibinary(LIR_sub, true);
}
bool TraceRecorder::JSOP_MUL()
{
    return ibinary(LIR_mul, true);
}
bool TraceRecorder::JSOP_DIV()
{
    return false;
}
bool TraceRecorder::JSOP_MOD()
{
    return false;
}
bool TraceRecorder::JSOP_NOT()
{
    return false;
}
bool TraceRecorder::JSOP_BITNOT()
{
    return false;
}
bool TraceRecorder::JSOP_NEG()
{
    jsval& v = stackval(-1);
    set(&v, lir->ins1(LIR_neg, get(&v)));
    return true;
}
bool TraceRecorder::JSOP_NEW()
{
    return false;
}
bool TraceRecorder::JSOP_DELNAME()
{
    return false;
}
bool TraceRecorder::JSOP_DELPROP()
{
    return false;
}
bool TraceRecorder::JSOP_DELELEM()
{
    return false;
}
bool TraceRecorder::JSOP_TYPEOF()
{
    return false;
}
bool TraceRecorder::JSOP_VOID()
{
    return false;
}
bool TraceRecorder::JSOP_INCNAME()
{
    return false;
}
bool TraceRecorder::JSOP_INCPROP()
{
    return false;
}
bool TraceRecorder::JSOP_INCELEM()
{
    return false;
}
bool TraceRecorder::JSOP_DECNAME()
{
    return false;
}
bool TraceRecorder::JSOP_DECPROP()
{
    return false;
}
bool TraceRecorder::JSOP_DECELEM()
{
    return false;
}
bool TraceRecorder::JSOP_NAMEINC()
{
    return false;
}
bool TraceRecorder::JSOP_PROPINC()
{
    return false;
}
bool TraceRecorder::JSOP_ELEMINC()
{
    return false;
}
bool TraceRecorder::JSOP_NAMEDEC()
{
    return false;
}
bool TraceRecorder::JSOP_PROPDEC()
{
    return false;
}
bool TraceRecorder::JSOP_ELEMDEC()
{
    return false;
}
bool TraceRecorder::JSOP_GETPROP()
{
    return false;
}
bool TraceRecorder::JSOP_SETPROP()
{
    return false;
}

bool TraceRecorder::guardAndLoadDenseArray(jsval& aval, jsval& ival,
                                           LIns*& objld, LIns*& dslotsld)
{
    JS_ASSERT(!JSVAL_IS_PRIMITIVE(aval));
    JSObject *obj = JSVAL_TO_OBJECT(aval);
    objld = get(&aval);
    dslotsld = lir->insLoadi(objld, offsetof(JSObject, dslots));

    // guard(OBJ_GET_CLASS(obj) == &js_ArrayClass);
    guard(true, lir->ins2(LIR_eq,
                          loadObjectClass(objld),
                          lir->insImmPtr(&js_ArrayClass)));

    
    jsint i = asInt(ival);
    jsuint capacity = ARRAY_DENSE_LENGTH(obj);
    jsint length = obj->fslots[JSSLOT_ARRAY_LENGTH];
    if ((jsuint)i >= capacity || i >= length)
        return false;
    
    // load lengths
    LIns* lengthld = lir->insLoadi(objld,
                                   offsetof(JSObject,
                                            fslots[JSSLOT_ARRAY_LENGTH]));
    
    // guard(i < length);
    guard(true, lir->ins2(LIR_lt, get(&ival), lengthld));
    
    // guard(i < capacity)
    guard(false, lir->ins_eq0(dslotsld));
    guard(true, lir->ins2(LIR_lt, get(&ival),
                          lir->insLoadi(dslotsld, sizeof(jsval) * -1)));

    return true;
}
bool TraceRecorder::JSOP_GETELEM()
{
    jsval& r = stackval(-1);
    jsval& l = stackval(-2);
    if (!isInt(r))
        return false;
    jsint i = asInt(r);
    if (!JSVAL_IS_PRIMITIVE(l)) {
        JSObject* obj = JSVAL_TO_OBJECT(l);
        if (OBJ_IS_DENSE_ARRAY(cx, obj)) {
            LInsp objld, dslotsld;
            if (!guardAndLoadDenseArray(l, r, objld, dslotsld))
                return false;

            LIns* slotoff = lir->ins2(LIR_mul, get(&r),
                                      lir->insImm(sizeof(jsval)));
                                      
            // XXX LIR_ld only accepts constant displacements!
            return false;
    
            LIns* val = lir->insLoad(LIR_ld, dslotsld, slotoff);
            if (obj->dslots[i] == JSVAL_HOLE)
                return false;
            guard(false, lir->ins2i(LIR_eq, val, JSVAL_HOLE));

            set(&l, val);
            return true;
        }
    }
    return false;
}
bool TraceRecorder::JSOP_SETELEM()
{
    jsval& v = stackval(-1);
    jsval& r = stackval(-2);
    jsval& l = stackval(-3);
    if (!isInt(r))
        return false;
    jsint i = asInt(r);
    if (!JSVAL_IS_PRIMITIVE(l)) {
        JSObject* obj = JSVAL_TO_OBJECT(l);
        if (OBJ_IS_DENSE_ARRAY(cx, obj)) {
            LInsp objld, dslotsld;
            if (!guardAndLoadDenseArray(l, r, objld, dslotsld))
                return false;

            LIns* slotoff = lir->ins2(LIR_mul, get(&r),
                                      lir->insImm(sizeof(jsval)));
                                      
            // XXX LIR_ld only accepts constant displacements!
            return false;

            LIns* oldval = lir->insLoad(LIR_ld, dslotsld, slotoff);
            if (obj->dslots[i] == JSVAL_HOLE)
                return false;
            guard(false, lir->ins2i(LIR_eq, oldval, JSVAL_HOLE));

            lir->insStore(get(&v), dslotsld, slotoff);
            set(&l, get(&v));
            return true;
        }
    }
    return false;
}
bool TraceRecorder::JSOP_CALLNAME()
{
    return false;
}
bool TraceRecorder::JSOP_CALL()
{
    return false;
}
bool TraceRecorder::JSOP_NAME()
{
    return false;
}
bool TraceRecorder::JSOP_DOUBLE()
{
    return false;
}
bool TraceRecorder::JSOP_STRING()
{
    return false;
}
bool TraceRecorder::JSOP_ZERO()
{
    stack(0, lir->insImm(0));
    return true;
}
bool TraceRecorder::JSOP_ONE()
{
    stack(0, lir->insImm(1));
    return true;
}
bool TraceRecorder::JSOP_NULL()
{
    stack(0, lir->insImm(0));
    return true;
}
bool TraceRecorder::JSOP_THIS()
{
    return false;
}
bool TraceRecorder::JSOP_FALSE()
{
    stack(0, lir->insImm(0));
    return true;
}
bool TraceRecorder::JSOP_TRUE()
{
    stack(0, lir->insImm(1));
    return true;
}
bool TraceRecorder::JSOP_OR()
{
    return false;
}
bool TraceRecorder::JSOP_AND()
{
    return false;
}
bool TraceRecorder::JSOP_TABLESWITCH()
{
    return false;
}
bool TraceRecorder::JSOP_LOOKUPSWITCH()
{
    return false;
}
bool TraceRecorder::JSOP_STRICTEQ()
{
    return false;
}
bool TraceRecorder::JSOP_STRICTNE()
{
    return false;
}
bool TraceRecorder::JSOP_CLOSURE()
{
    return false;
}
bool TraceRecorder::JSOP_EXPORTALL()
{
    return false;
}
bool TraceRecorder::JSOP_EXPORTNAME()
{
    return false;
}
bool TraceRecorder::JSOP_IMPORTALL()
{
    return false;
}
bool TraceRecorder::JSOP_IMPORTPROP()
{
    return false;
}
bool TraceRecorder::JSOP_IMPORTELEM()
{
    return false;
}
bool TraceRecorder::JSOP_OBJECT()
{
    return false;
}
bool TraceRecorder::JSOP_POP()
{
    return false;
}
bool TraceRecorder::JSOP_POS()
{
    return false;
}
bool TraceRecorder::JSOP_TRAP()
{
    return false;
}
bool TraceRecorder::JSOP_GETARG()
{
    stack(0, arg(GET_ARGNO(cx->fp->regs->pc)));
    return true;
}
bool TraceRecorder::JSOP_SETARG()
{
    arg(GET_ARGNO(cx->fp->regs->pc), stack(-1));
    return true;
}
bool TraceRecorder::JSOP_GETVAR()
{
    stack(0, var(GET_VARNO(cx->fp->regs->pc)));
    return true;
}
bool TraceRecorder::JSOP_SETVAR()
{
    var(GET_VARNO(cx->fp->regs->pc), stack(-1));
    return true;
}
bool TraceRecorder::JSOP_UINT16()
{
    stack(0, lir->insImm((jsint) GET_UINT16(cx->fp->regs->pc)));
    return true;
}
bool TraceRecorder::JSOP_NEWINIT()
{
    return false;
}
bool TraceRecorder::JSOP_ENDINIT()
{
    return false;
}
bool TraceRecorder::JSOP_INITPROP()
{
    return false;
}
bool TraceRecorder::JSOP_INITELEM()
{
    return false;
}
bool TraceRecorder::JSOP_DEFSHARP()
{
    return false;
}
bool TraceRecorder::JSOP_USESHARP()
{
    return false;
}
bool TraceRecorder::JSOP_INCARG()
{
    return inc(argval(GET_ARGNO(cx->fp->regs->pc)), 1, true);
}
bool TraceRecorder::JSOP_INCVAR()
{
    return inc(varval(GET_VARNO(cx->fp->regs->pc)), 1, true);
}
bool TraceRecorder::JSOP_DECARG()
{
    return inc(argval(GET_ARGNO(cx->fp->regs->pc)), -1, true);
}
bool TraceRecorder::JSOP_DECVAR()
{
    return inc(varval(GET_VARNO(cx->fp->regs->pc)), -1, true);
}
bool TraceRecorder::JSOP_ARGINC()
{
    return inc(argval(GET_ARGNO(cx->fp->regs->pc)), 1, false);
}
bool TraceRecorder::JSOP_VARINC()
{
    return inc(varval(GET_VARNO(cx->fp->regs->pc)), 1, false);
}
bool TraceRecorder::JSOP_ARGDEC()
{
    return inc(argval(GET_ARGNO(cx->fp->regs->pc)), -1, false);
}
bool TraceRecorder::JSOP_VARDEC()
{
    return inc(varval(GET_VARNO(cx->fp->regs->pc)), -1, false);
}
bool TraceRecorder::JSOP_ITER()
{
    return false;
}
bool TraceRecorder::JSOP_FORNAME()
{
    return false;
}
bool TraceRecorder::JSOP_FORPROP()
{
    return false;
}
bool TraceRecorder::JSOP_FORELEM()
{
    return false;
}
bool TraceRecorder::JSOP_POPN()
{
    return false;
}
bool TraceRecorder::JSOP_BINDNAME()
{
    /* BINDNAME is a no-op for the recorder. We wait until we hit the
       SETNAME/SETPROP that uses it. This is safe because the 
       interpreter calculates here the scope we will use and we
       will use that value to guard against in SETNAME/SETPROP. */
    return true;
}    
bool TraceRecorder::JSOP_SETNAME()
{
    return false;
}
bool TraceRecorder::JSOP_THROW()
{
    return false;
}
bool TraceRecorder::JSOP_IN()
{
    return false;
}
bool TraceRecorder::JSOP_INSTANCEOF()
{
    return false;
}
bool TraceRecorder::JSOP_DEBUGGER()
{
    return false;
}
bool TraceRecorder::JSOP_GOSUB()
{
    return false;
}
bool TraceRecorder::JSOP_RETSUB()
{
    return false;
}
bool TraceRecorder::JSOP_EXCEPTION()
{
    return false;
}
bool TraceRecorder::JSOP_LINENO()
{
    return false;
}
bool TraceRecorder::JSOP_CONDSWITCH()
{
    return false;
}
bool TraceRecorder::JSOP_CASE()
{
    return false;
}
bool TraceRecorder::JSOP_DEFAULT()
{
    return false;
}
bool TraceRecorder::JSOP_EVAL()
{
    return false;
}
bool TraceRecorder::JSOP_ENUMELEM()
{
    return false;
}
bool TraceRecorder::JSOP_GETTER()
{
    return false;
}
bool TraceRecorder::JSOP_SETTER()
{
    return false;
}
bool TraceRecorder::JSOP_DEFFUN()
{
    return false;
}
bool TraceRecorder::JSOP_DEFCONST()
{
    return false;
}
bool TraceRecorder::JSOP_DEFVAR()
{
    return false;
}
bool TraceRecorder::JSOP_ANONFUNOBJ()
{
    return false;
}
bool TraceRecorder::JSOP_NAMEDFUNOBJ()
{
    return false;
}
bool TraceRecorder::JSOP_SETLOCALPOP()
{
    return false;
}
bool TraceRecorder::JSOP_GROUP()
{
    return true; // no-op
}
bool TraceRecorder::JSOP_SETCALL()
{
    return false;
}
bool TraceRecorder::JSOP_TRY()
{
    return false;
}
bool TraceRecorder::JSOP_FINALLY()
{
    return false;
}
bool TraceRecorder::JSOP_NOP()
{
    return false;
}
bool TraceRecorder::JSOP_ARGSUB()
{
    return false;
}
bool TraceRecorder::JSOP_ARGCNT()
{
    return false;
}
bool TraceRecorder::JSOP_DEFLOCALFUN()
{
    return false;
}
bool TraceRecorder::JSOP_GOTOX()
{
    return false;
}
bool TraceRecorder::JSOP_IFEQX()
{
    return false;
}
bool TraceRecorder::JSOP_IFNEX()
{
    return false;
}
bool TraceRecorder::JSOP_ORX()
{
    return false;
}
bool TraceRecorder::JSOP_ANDX()
{
    return false;
}
bool TraceRecorder::JSOP_GOSUBX()
{
    return false;
}
bool TraceRecorder::JSOP_CASEX()
{
    return false;
}
bool TraceRecorder::JSOP_DEFAULTX()
{
    return false;
}
bool TraceRecorder::JSOP_TABLESWITCHX()
{
    return false;
}
bool TraceRecorder::JSOP_LOOKUPSWITCHX()
{
    return false;
}
bool TraceRecorder::JSOP_BACKPATCH()
{
    return false;
}
bool TraceRecorder::JSOP_BACKPATCH_POP()
{
    return false;
}
bool TraceRecorder::JSOP_THROWING()
{
    return false;
}
bool TraceRecorder::JSOP_SETRVAL()
{
    return false;
}
bool TraceRecorder::JSOP_RETRVAL()
{
    return false;
}
bool TraceRecorder::JSOP_GETGVAR()
{
    return false;
}
bool TraceRecorder::JSOP_SETGVAR()
{
    return false;
}
bool TraceRecorder::JSOP_INCGVAR()
{
    return false;
}
bool TraceRecorder::JSOP_DECGVAR()
{
    return false;
}
bool TraceRecorder::JSOP_GVARINC()
{
    return false;
}
bool TraceRecorder::JSOP_GVARDEC()
{
    return false;
}
bool TraceRecorder::JSOP_REGEXP()
{
    return false;
}
bool TraceRecorder::JSOP_DEFXMLNS()
{
    return false;
}
bool TraceRecorder::JSOP_ANYNAME()
{
    return false;
}
bool TraceRecorder::JSOP_QNAMEPART()
{
    return false;
}
bool TraceRecorder::JSOP_QNAMECONST()
{
    return false;
}
bool TraceRecorder::JSOP_QNAME()
{
    return false;
}
bool TraceRecorder::JSOP_TOATTRNAME()
{
    return false;
}
bool TraceRecorder::JSOP_TOATTRVAL()
{
    return false;
}
bool TraceRecorder::JSOP_ADDATTRNAME()
{
    return false;
}
bool TraceRecorder::JSOP_ADDATTRVAL()
{
    return false;
}
bool TraceRecorder::JSOP_BINDXMLNAME()
{
    return false;
}
bool TraceRecorder::JSOP_SETXMLNAME()
{
    return false;
}
bool TraceRecorder::JSOP_XMLNAME()
{
    return false;
}
bool TraceRecorder::JSOP_DESCENDANTS()
{
    return false;
}
bool TraceRecorder::JSOP_FILTER()
{
    return false;
}
bool TraceRecorder::JSOP_ENDFILTER()
{
    return false;
}
bool TraceRecorder::JSOP_TOXML()
{
    return false;
}
bool TraceRecorder::JSOP_TOXMLLIST()
{
    return false;
}
bool TraceRecorder::JSOP_XMLTAGEXPR()
{
    return false;
}
bool TraceRecorder::JSOP_XMLELTEXPR()
{
    return false;
}
bool TraceRecorder::JSOP_XMLOBJECT()
{
    return false;
}
bool TraceRecorder::JSOP_XMLCDATA()
{
    return false;
}
bool TraceRecorder::JSOP_XMLCOMMENT()
{
    return false;
}
bool TraceRecorder::JSOP_XMLPI()
{
    return false;
}
bool TraceRecorder::JSOP_CALLPROP()
{
    return false;
}
bool TraceRecorder::JSOP_GETFUNNS()
{
    return false;
}
bool TraceRecorder::JSOP_UNUSED186()
{
    return false;
}
bool TraceRecorder::JSOP_DELDESC()
{
    return false;
}
bool TraceRecorder::JSOP_UINT24()
{
    stack(0, lir->insImm((jsint) GET_UINT24(cx->fp->regs->pc)));
    return true;
}
bool TraceRecorder::JSOP_INDEXBASE()
{
    return false;
}
bool TraceRecorder::JSOP_RESETBASE()
{
    return false;
}
bool TraceRecorder::JSOP_RESETBASE0()
{
    return false;
}
bool TraceRecorder::JSOP_STARTXML()
{
    return false;
}
bool TraceRecorder::JSOP_STARTXMLEXPR()
{
    return false;
}
bool TraceRecorder::JSOP_CALLELEM()
{
    return false;
}
bool TraceRecorder::JSOP_STOP()
{
    return false;
}
bool TraceRecorder::JSOP_GETXPROP()
{
    return false;
}
bool TraceRecorder::JSOP_CALLXMLNAME()
{
    return false;
}
bool TraceRecorder::JSOP_TYPEOFEXPR()
{
    return false;
}
bool TraceRecorder::JSOP_ENTERBLOCK()
{
    return false;
}
bool TraceRecorder::JSOP_LEAVEBLOCK()
{
    return false;
}
bool TraceRecorder::JSOP_GETLOCAL()
{
    return false;
}
bool TraceRecorder::JSOP_SETLOCAL()
{
    return false;
}
bool TraceRecorder::JSOP_INCLOCAL()
{
    return false;
}
bool TraceRecorder::JSOP_DECLOCAL()
{
    return false;
}
bool TraceRecorder::JSOP_LOCALINC()
{
    return false;
}
bool TraceRecorder::JSOP_LOCALDEC()
{
    return false;
}
bool TraceRecorder::JSOP_FORLOCAL()
{
    return false;
}
bool TraceRecorder::JSOP_FORCONST()
{
    return false;
}
bool TraceRecorder::JSOP_ENDITER()
{
    return false;
}
bool TraceRecorder::JSOP_GENERATOR()
{
    return false;
}
bool TraceRecorder::JSOP_YIELD()
{
    return false;
}
bool TraceRecorder::JSOP_ARRAYPUSH()
{
    return false;
}
bool TraceRecorder::JSOP_UNUSED213()
{
    return false;
}
bool TraceRecorder::JSOP_ENUMCONSTELEM()
{
    return false;
}
bool TraceRecorder::JSOP_LEAVEBLOCKEXPR()
{
    return false;
}
bool TraceRecorder::JSOP_GETTHISPROP()
{
    return false;
}
bool TraceRecorder::JSOP_GETARGPROP()
{
    return false;
}
bool TraceRecorder::JSOP_GETVARPROP()
{
    return false;
}
bool TraceRecorder::JSOP_GETLOCALPROP()
{
    return false;
}
bool TraceRecorder::JSOP_INDEXBASE1()
{
    return false;
}
bool TraceRecorder::JSOP_INDEXBASE2()
{
    return false;
}
bool TraceRecorder::JSOP_INDEXBASE3()
{
    return false;
}
bool TraceRecorder::JSOP_CALLGVAR()
{
    return false;
}
bool TraceRecorder::JSOP_CALLVAR()
{
    return false;
}
bool TraceRecorder::JSOP_CALLARG()
{
    return false;
}
bool TraceRecorder::JSOP_CALLLOCAL()
{
    return false;
}
bool TraceRecorder::JSOP_INT8()
{
    stack(0, lir->insImm(GET_INT8(cx->fp->regs->pc)));
    return true;
}
bool TraceRecorder::JSOP_INT32()
{
    stack(0, lir->insImm(GET_INT32(cx->fp->regs->pc)));
    return true;
}
bool TraceRecorder::JSOP_LENGTH()
{
    return false;
}
bool TraceRecorder::JSOP_NEWARRAY()
{
    return false;
}
bool TraceRecorder::JSOP_HOLE()
{
    return false;
}