void
BaselineFrame::trace(JSTracer* trc, JitFrameIterator& frameIterator)
{
replaceCalleeToken(MarkCalleeToken(trc, calleeToken()));
TraceRoot(trc, &thisValue(), "baseline-this");
// Mark actual and formal args.
if (isNonEvalFunctionFrame()) {
unsigned numArgs = js::Max(numActualArgs(), numFormalArgs());
TraceRootRange(trc, numArgs + isConstructing(), argv(), "baseline-args");
}
// Mark scope chain, if it exists.
if (scopeChain_)
TraceRoot(trc, &scopeChain_, "baseline-scopechain");
// Mark return value.
if (hasReturnValue())
TraceRoot(trc, returnValue().address(), "baseline-rval");
if (isEvalFrame()) {
TraceRoot(trc, &evalScript_, "baseline-evalscript");
if (isFunctionFrame())
TraceRoot(trc, evalNewTargetAddress(), "baseline-evalNewTarget");
}
if (hasArgsObj())
TraceRoot(trc, &argsObj_, "baseline-args-obj");
// Mark locals and stack values.
JSScript* script = this->script();
size_t nfixed = script->nfixed();
jsbytecode* pc;
frameIterator.baselineScriptAndPc(nullptr, &pc);
size_t nlivefixed = script->calculateLiveFixed(pc);
// NB: It is possible that numValueSlots() could be zero, even if nfixed is
// nonzero. This is the case if the function has an early stack check.
if (numValueSlots() == 0)
return;
MOZ_ASSERT(nfixed <= numValueSlots());
if (nfixed == nlivefixed) {
// All locals are live.
MarkLocals(this, trc, 0, numValueSlots());
} else {
// Mark operand stack.
MarkLocals(this, trc, nfixed, numValueSlots());
// Clear dead block-scoped locals.
while (nfixed > nlivefixed)
unaliasedLocal(--nfixed).setMagic(JS_UNINITIALIZED_LEXICAL);
// Mark live locals.
MarkLocals(this, trc, 0, nlivefixed);
}
}
