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Bug 714109 - Add missing barriers to Generator; r=billm

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The generator object stores aside values from the stack of the generator
function when the generator is not running.  These values need to properly root
objects in the nursery.
This commit is contained in:
Terrence Cole 2012-01-03 11:50:07 -08:00
parent 389bd33824
commit 12879a07ec
4 changed files with 83 additions and 28 deletions
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24
js/src/jsiter.cpp
View File

@ -1371,16 +1371,11 @@ MarkGenerator(JSTracer *trc, JSGenerator *gen)
*/
JS_ASSERT(size_t(gen->regs.sp - fp->slots()) <= fp->numSlots());
/*
* Currently, generators are not mjitted. Still, (overflow) args can be
* pushed by the mjit and need to be conservatively marked. Technically, the
* formal args and generator slots are safe for exact marking, but since the
* plan is to eventually mjit generators, it makes sense to future-proof
* this code and save someone an hour later.
*/
MarkStackRangeConservatively(trc, gen->floatingStack, fp->formalArgsEnd());
MarkValueRange(trc, (HeapValue *)fp->formalArgsEnd() - gen->floatingStack,
gen->floatingStack, "Generator Floating Args");
js_TraceStackFrame(trc, fp);
MarkStackRangeConservatively(trc, fp->slots(), gen->regs.sp);
MarkValueRange(trc, gen->regs.sp - fp->slots(),
(HeapValue *)fp->slots(), "Generator Floating Stack");
}
static void
@ -1469,14 +1464,18 @@ js_NewGenerator(JSContext *cx)
(-1 + /* one Value included in JSGenerator */
vplen +
VALUES_PER_STACK_FRAME +
stackfp->numSlots()) * sizeof(Value);
stackfp->numSlots()) * sizeof(HeapValue);
JS_ASSERT(nbytes % sizeof(Value) == 0);
JS_STATIC_ASSERT(sizeof(StackFrame) % sizeof(HeapValue) == 0);
JSGenerator *gen = (JSGenerator *) cx->malloc_(nbytes);
if (!gen)
return NULL;
SetValueRangeToUndefined((Value *)gen, nbytes / sizeof(Value));
/* Cut up floatingStack space. */
Value *genvp = gen->floatingStack;
HeapValue *genvp = gen->floatingStack;
StackFrame *genfp = reinterpret_cast<StackFrame *>(genvp + vplen);
/* Initialize JSGenerator. */
@ -1487,7 +1486,8 @@ js_NewGenerator(JSContext *cx)
/* Copy from the stack to the generator's floating frame. */
gen->regs.rebaseFromTo(stackRegs, *genfp);
genfp->stealFrameAndSlots(genvp, stackfp, stackvp, stackRegs.sp);
genfp->stealFrameAndSlots<HeapValue, Value, StackFrame::DoPostBarrier>(
genfp, genvp, stackfp, stackvp, stackRegs.sp);
genfp->initFloatingGenerator();
obj->setPrivate(gen);

2
js/src/jsiter.h
View File

@ -237,7 +237,7 @@ struct JSGenerator {
js::FrameRegs regs;
JSObject *enumerators;
js::StackFrame *floating;
js::Value floatingStack[1];
js::HeapValue floatingStack[1];
js::StackFrame *floatingFrame() {
return floating;

72
js/src/vm/Stack.cpp
View File

@ -38,6 +38,7 @@
*
* ***** END LICENSE BLOCK ***** */
#include "jscntxt.h"
#include "jsgcmark.h"
#include "methodjit/MethodJIT.h"
#include "Stack.h"
@ -125,21 +126,31 @@ StackFrame::initDummyFrame(JSContext *cx, JSObject &chain)
setScopeChainNoCallObj(chain);
}
template <class T, class U, StackFrame::TriggerPostBarriers doPostBarrier>
void
StackFrame::stealFrameAndSlots(Value *vp, StackFrame *otherfp,
Value *othervp, Value *othersp)
StackFrame::stealFrameAndSlots(StackFrame *fp, T *vp, StackFrame *otherfp, U *othervp,
Value *othersp)
{
JS_ASSERT(vp == (Value *)this - ((Value *)otherfp - othervp));
JS_ASSERT(othervp == otherfp->actualArgs() - 2);
JS_ASSERT((U *)vp == (U *)this - ((U *)otherfp - othervp));
JS_ASSERT((Value *)othervp == otherfp->actualArgs() - 2);
JS_ASSERT(othersp >= otherfp->slots());
JS_ASSERT(othersp <= otherfp->base() + otherfp->numSlots());
JS_ASSERT((T *)fp - vp == (U *)otherfp - othervp);
PodCopy(vp, othervp, othersp - othervp);
JS_ASSERT(vp == this->actualArgs() - 2);
/* Copy args, StackFrame, and slots. */
U *srcend = (U *)otherfp->formalArgsEnd();
T *dst = vp;
for (U *src = othervp; src < srcend; src++, dst++)
*dst = *src;
/* Catch bad-touching of non-canonical args (e.g., generator_trace). */
if (otherfp->hasOverflowArgs())
Debug_SetValueRangeToCrashOnTouch(othervp, othervp + 2 + otherfp->numFormalArgs());
*fp = *otherfp;
if (doPostBarrier)
fp->writeBarrierPost();
srcend = (U *)othersp;
dst = (T *)fp->slots();
for (U *src = (U *)otherfp->slots(); src < srcend; src++, dst++)
*dst = *src;
/*
* Repoint Call, Arguments, Block and With objects to the new live frame.
@ -166,6 +177,37 @@ StackFrame::stealFrameAndSlots(Value *vp, StackFrame *otherfp,
}
}
/* Note: explicit instantiation for js_NewGenerator located in jsiter.cpp. */
template void StackFrame::stealFrameAndSlots<Value, HeapValue, StackFrame::NoPostBarrier>(
StackFrame *, Value *,
StackFrame *, HeapValue *, Value *);
template void StackFrame::stealFrameAndSlots<HeapValue, Value, StackFrame::DoPostBarrier>(
StackFrame *, HeapValue *,
StackFrame *, Value *, Value *);
void
StackFrame::writeBarrierPost()
{
/* This needs to follow the same rules as in js_TraceStackFrame. */
if (scopeChain_)
JSObject::writeBarrierPost(scopeChain_, (void *)&scopeChain_);
if (isDummyFrame())
return;
if (hasArgsObj())
JSObject::writeBarrierPost(argsObj_, (void *)&argsObj_);
if (isScriptFrame()) {
if (isFunctionFrame()) {
JSFunction::writeBarrierPost((JSObject *)exec.fun, (void *)&exec.fun);
if (isEvalFrame())
JSScript::writeBarrierPost(u.evalScript, (void *)&u.evalScript);
} else {
JSScript::writeBarrierPost(exec.script, (void *)&exec.script);
}
}
if (hasReturnValue())
HeapValue::writeBarrierPost(rval_, &rval_);
}
#ifdef DEBUG
JSObject *const StackFrame::sInvalidScopeChain = (JSObject *)0xbeef;
#endif
@ -755,8 +797,8 @@ bool
ContextStack::pushGeneratorFrame(JSContext *cx, JSGenerator *gen, GeneratorFrameGuard *gfg)
{
StackFrame *genfp = gen->floatingFrame();
Value *genvp = gen->floatingStack;
uintN vplen = (Value *)genfp - genvp;
HeapValue *genvp = gen->floatingStack;
uintN vplen = (HeapValue *)genfp - genvp;
uintN nvars = vplen + VALUES_PER_STACK_FRAME + genfp->numSlots();
Value *firstUnused = ensureOnTop(cx, REPORT_ERROR, nvars, CAN_EXTEND, &gfg->pushedSeg_);
@ -782,7 +824,8 @@ ContextStack::pushGeneratorFrame(JSContext *cx, JSGenerator *gen, GeneratorFrame
JSObject::writeBarrierPre(genobj);
/* Copy from the generator's floating frame to the stack. */
stackfp->stealFrameAndSlots(stackvp, genfp, genvp, gen->regs.sp);
stackfp->stealFrameAndSlots<Value, HeapValue, StackFrame::NoPostBarrier>(
stackfp, stackvp, genfp, genvp, gen->regs.sp);
stackfp->resetGeneratorPrev(cx);
stackfp->unsetFloatingGenerator();
gfg->regs_.rebaseFromTo(gen->regs, *stackfp);
@ -798,7 +841,7 @@ ContextStack::popGeneratorFrame(const GeneratorFrameGuard &gfg)
{
JSGenerator *gen = gfg.gen_;
StackFrame *genfp = gen->floatingFrame();
Value *genvp = gen->floatingStack;
HeapValue *genvp = gen->floatingStack;
const FrameRegs &stackRegs = gfg.regs_;
StackFrame *stackfp = stackRegs.fp();
@ -806,7 +849,8 @@ ContextStack::popGeneratorFrame(const GeneratorFrameGuard &gfg)
/* Copy from the stack to the generator's floating frame. */
gen->regs.rebaseFromTo(stackRegs, *genfp);
genfp->stealFrameAndSlots(genvp, stackfp, stackvp, stackRegs.sp);
genfp->stealFrameAndSlots<HeapValue, Value, StackFrame::DoPostBarrier>(
genfp, genvp, stackfp, stackvp, stackRegs.sp);
genfp->setFloatingGenerator();
/* ~FrameGuard/popFrame will finish the popping. */

13
js/src/vm/Stack.h
View File

@ -430,7 +430,14 @@ class StackFrame
const Value &thisv, JSObject &scopeChain, ExecuteType type);
/* Used when activating generators. */
void stealFrameAndSlots(Value *vp, StackFrame *otherfp, Value *othervp, Value *othersp);
enum TriggerPostBarriers {
DoPostBarrier = true,
NoPostBarrier = false
};
template <class T, class U, TriggerPostBarriers doPostBarrier>
void stealFrameAndSlots(StackFrame *fp, T *vp, StackFrame *otherfp, U *othervp,
Value *othersp);
void writeBarrierPost();
/* Perhaps one fine day we will remove dummy frames. */
void initDummyFrame(JSContext *cx, JSObject &chain);
@ -988,6 +995,10 @@ class StackFrame
/* Return value */
bool hasReturnValue() const {
return !!(flags_ & HAS_RVAL);
}
const Value &returnValue() {
if (!(flags_ & HAS_RVAL))
rval_.setUndefined();