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Bug 976536 - Fix JSFunction::existingScript returning NULL in some cases. r=till

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This commit is contained in:
Jan de Mooij 2014-04-19 13:45:59 +02:00
parent 1a30be1a44
commit 4cc413921c
3 changed files with 17 additions and 11 deletions
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6
js/src/jit/BaselineBailouts.cpp
View File

@ -1339,9 +1339,10 @@ jit::BailoutIonToBaseline(JSContext *cx, JitActivation *activation, IonBailoutIt
SnapshotIterator snapIter(iter);
RootedFunction callee(cx, iter.maybeCallee());
RootedScript scr(cx, iter.script());
if (callee) {
IonSpew(IonSpew_BaselineBailouts, " Callee function (%s:%u)",
callee->existingScript()->filename(), callee->existingScript()->lineno());
scr->filename(), scr->lineno());
} else {
IonSpew(IonSpew_BaselineBailouts, " No callee!");
}
@ -1358,7 +1359,6 @@ jit::BailoutIonToBaseline(JSContext *cx, JitActivation *activation, IonBailoutIt
RootedScript caller(cx);
jsbytecode *callerPC = nullptr;
RootedFunction fun(cx, callee);
RootedScript scr(cx, iter.script());
AutoValueVector startFrameFormals(cx);
RootedScript topCaller(cx);
@ -1400,7 +1400,7 @@ jit::BailoutIonToBaseline(JSContext *cx, JitActivation *activation, IonBailoutIt
caller = scr;
callerPC = callPC;
fun = nextCallee;
scr = fun->existingScript();
scr = fun->existingScriptForInlinedFunction();
// Save top caller info for adjusting SPS frames later.
if (!topCaller) {

2
js/src/jit/IonFrames.cpp
View File

@ -1652,7 +1652,7 @@ InlineFrameIteratorMaybeGC<allowGC>::findNextFrame()
// Inlined functions may be clones that still point to the lazy script
// for the executed script, if they are clones. The actual script
// exists though, just make sure the function points to it.
script_ = callee_->existingScript();
script_ = callee_->existingScriptForInlinedFunction();
MOZ_ASSERT(script_->hasBaselineScript());
pc_ = script_->offsetToPC(si_.pcOffset());

20
js/src/jsfun.h
View File

@ -268,9 +268,9 @@ class JSFunction : public JSObject
// JSScript, delazifying the function if necessary. This is the safest to
// use, but has extra checks, requires a cx and may trigger a GC.
//
// - For functions which may have a LazyScript but whose JSScript is known
// to exist, existingScript() will get the script and delazify the
// function if necessary.
// - For inlined functions which may have a LazyScript but whose JSScript
// is known to exist, existingScriptForInlinedFunction() will get the
// script and delazify the function if necessary.
//
// - For functions known to have a JSScript, nonLazyScript() will get it.
@ -286,12 +286,18 @@ class JSFunction : public JSObject
return nonLazyScript();
}
JSScript *existingScript() {
JS_ASSERT(isInterpreted());
JSScript *existingScriptForInlinedFunction() {
MOZ_ASSERT(isInterpreted());
if (isInterpretedLazy()) {
// Get the script from the canonical function. Ion used the
// canonical function to inline the script and because it has
// Baseline code it has not been relazified. Note that we can't
// use lazyScript->script_ here as it may be null in some cases,
// see bug 976536.
js::LazyScript *lazy = lazyScript();
JSScript *script = lazy->maybeScript();
JS_ASSERT(script);
JSFunction *fun = lazy->functionNonDelazifying();
MOZ_ASSERT(fun);
JSScript *script = fun->nonLazyScript();
if (shadowZone()->needsBarrier())
js::LazyScript::writeBarrierPre(lazy);