void
StackSpace::markFrameSlots(JSTracer *trc, StackFrame *fp, Value *slotsEnd, jsbytecode *pc)
{
Value *slotsBegin = fp->slots();
if (!fp->isScriptFrame()) {
JS_ASSERT(fp->isDummyFrame());
gc::MarkValueRootRange(trc, slotsBegin, slotsEnd, "vm_stack");
return;
}
/* If it's a scripted frame, we should have a pc. */
JS_ASSERT(pc);
JSScript *script = fp->script();
if (!script->hasAnalysis() || !script->analysis()->ranLifetimes()) {
gc::MarkValueRootRange(trc, slotsBegin, slotsEnd, "vm_stack");
return;
}
/*
* If the JIT ran a lifetime analysis, then it may have left garbage in the
* slots considered not live. We need to avoid marking them. Additionally,
* in case the analysis information is thrown out later, we overwrite these
* dead slots with valid values so that future GCs won't crash. Analysis
* results are thrown away during the sweeping phase, so we always have at
* least one GC to do this.
*/
analyze::AutoEnterAnalysis aea(script->compartment());
analyze::ScriptAnalysis *analysis = script->analysis();
uint32_t offset = pc - script->code;
Value *fixedEnd = slotsBegin + script->nfixed;
for (Value *vp = slotsBegin; vp < fixedEnd; vp++) {
uint32_t slot = analyze::LocalSlot(script, vp - slotsBegin);
/*
* Will this slot be synced by the JIT? If not, replace with a dummy
* value with the same type tag.
*/
if (!analysis->trackSlot(slot) || analysis->liveness(slot).live(offset))
gc::MarkValueRoot(trc, vp, "vm_stack");
else if (vp->isObject())
*vp = ObjectValue(fp->scopeChain()->global());
else if (vp->isString())
*vp = StringValue(trc->runtime->atomState.nullAtom);
}
gc::MarkValueRootRange(trc, fixedEnd, slotsEnd, "vm_stack");
}
bool
TypeInferenceOracle::canEnterInlinedFunction(JSFunction *target)
{
JSScript *script = target->script();
if (!script->hasAnalysis() || !script->analysis()->ranInference())
return false;
if (!script->analysis()->inlineable())
return false;
if (script->analysis()->usesScopeChain())
return false;
if (target->getType(cx)->unknownProperties())
return false;
// TI calls ObjectStateChange to trigger invalidation of the caller.
HeapTypeSet::WatchObjectStateChange(cx, target->getType(cx));
return true;
}
void
StackSpace::markFrameValues(JSTracer *trc, StackFrame *fp, Value *slotsEnd, jsbytecode *pc)
{
Value *slotsBegin = fp->slots();
if (!fp->isScriptFrame()) {
JS_ASSERT(fp->isDummyFrame());
gc::MarkValueRootRange(trc, slotsBegin, slotsEnd, "vm_stack");
return;
}
/* If it's a scripted frame, we should have a pc. */
JS_ASSERT(pc);
JSScript *script = fp->script();
if (!script->hasAnalysis() || !script->analysis()->ranLifetimes()) {
gc::MarkValueRootRange(trc, slotsBegin, slotsEnd, "vm_stack");
return;
}
/*
* If the JIT ran a lifetime analysis, then it may have left garbage in the
* slots considered not live. We need to avoid marking them. Additionally,
* in case the analysis information is thrown out later, we overwrite these
* dead slots with valid values so that future GCs won't crash. Analysis
* results are thrown away during the sweeping phase, so we always have at
* least one GC to do this.
*/
analyze::AutoEnterAnalysis aea(script->compartment());
analyze::ScriptAnalysis *analysis = script->analysis();
uint32_t offset = pc - script->code;
Value *fixedEnd = slotsBegin + script->nfixed;
for (Value *vp = slotsBegin; vp < fixedEnd; vp++) {
uint32_t slot = analyze::LocalSlot(script, vp - slotsBegin);
/*
* Will this slot be synced by the JIT? If not, replace with a dummy
* value with the same type tag.
*/
if (!analysis->trackSlot(slot) || analysis->liveness(slot).live(offset)) {
gc::MarkValueRoot(trc, vp, "vm_stack");
} else if (vp->isDouble()) {
*vp = DoubleValue(0.0);
} else {
/*
* It's possible that *vp may not be a valid Value. For example, it
* may be tagged as a NullValue but the low bits may be nonzero so
* that isNull() returns false. This can cause problems later on
* when marking the value. Extracting the type in this way and then
* overwriting the value circumvents the problem.
*/
JSValueType type = vp->extractNonDoubleType();
if (type == JSVAL_TYPE_INT32)
*vp = Int32Value(0);
else if (type == JSVAL_TYPE_UNDEFINED)
*vp = UndefinedValue();
else if (type == JSVAL_TYPE_BOOLEAN)
*vp = BooleanValue(false);
else if (type == JSVAL_TYPE_STRING)
*vp = StringValue(trc->runtime->atomState.nullAtom);
else if (type == JSVAL_TYPE_NULL)
*vp = NullValue();
else if (type == JSVAL_TYPE_OBJECT)
*vp = ObjectValue(fp->scopeChain()->global());
}
}
gc::MarkValueRootRange(trc, fixedEnd, slotsEnd, "vm_stack");
}
