static void
MarkIonJSFrame(JSTracer *trc, const IonFrameIterator &frame)
{
// Currently, this code only executes in sequential execution.
CompileMode compileMode = COMPILE_MODE_SEQ;
IonJSFrameLayout *layout = (IonJSFrameLayout *)frame.fp();
MarkCalleeToken(trc, layout->calleeToken());
IonScript *ionScript;
if (frame.checkInvalidation(&ionScript)) {
// This frame has been invalidated, meaning that its IonScript is no
// longer reachable through the callee token (JSFunction/JSScript->ion
// is now NULL or recompiled). Manually trace it here.
IonScript::Trace(trc, ionScript);
} else if (CalleeTokenIsFunction(layout->calleeToken())) {
ionScript = CalleeTokenToFunction(layout->calleeToken())->script()->ions[compileMode];
} else {
ionScript = CalleeTokenToScript(layout->calleeToken())->ions[compileMode];
}
if (CalleeTokenIsFunction(layout->calleeToken())) {
// (NBP) We do not need to mark formal arguments since they are covered
// by the safepoint.
size_t nargs = frame.numActualArgs();
// Trace function arguments. Note + 1 for thisv.
Value *argv = layout->argv();
for (size_t i = 0; i < nargs + 1; i++)
gc::MarkValueRoot(trc, &argv[i], "ion-argv");
}
const SafepointIndex *si = ionScript->getSafepointIndex(frame.returnAddressToFp());
SafepointReader safepoint(ionScript, si);
// Scan through slots which contain pointers (or on punboxing systems,
// actual values).
uint32 slot;
while (safepoint.getGcSlot(&slot)) {
uintptr_t *ref = layout->slotRef(slot);
gc::MarkGCThingRoot(trc, reinterpret_cast<void **>(ref), "ion-gc-slot");
}
while (safepoint.getValueSlot(&slot)) {
Value *v = (Value *)layout->slotRef(slot);
gc::MarkValueRoot(trc, v, "ion-gc-slot");
}
uintptr_t *spill = frame.spillBase();
GeneralRegisterSet gcRegs = safepoint.gcSpills();
GeneralRegisterSet valueRegs = safepoint.valueSpills();
for (GeneralRegisterIterator iter(safepoint.allSpills()); iter.more(); iter++) {
--spill;
if (gcRegs.has(*iter))
gc::MarkGCThingRoot(trc, reinterpret_cast<void **>(spill), "ion-gc-spill");
else if (valueRegs.has(*iter))
gc::MarkValueRoot(trc, reinterpret_cast<Value *>(spill), "ion-value-spill");
}
#ifdef JS_NUNBOX32
LAllocation type, payload;
while (safepoint.getNunboxSlot(&type, &payload)) {
jsval_layout layout;
layout.s.tag = (JSValueTag)ReadAllocation(frame, &type);
layout.s.payload.uintptr = ReadAllocation(frame, &payload);
Value v = IMPL_TO_JSVAL(layout);
gc::MarkValueRoot(trc, &v, "ion-torn-value");
JS_ASSERT(v == IMPL_TO_JSVAL(layout));
}
#endif
}
