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Bug 913216: Mark the entire heap to be flushed as soon as we start modifing bounds checks. (r=luke)

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This commit is contained in:
Marty Rosenberg 2013-09-06 05:14:44 -04:00
parent c122699022
commit 460dea0526
3 changed files with 7 additions and 4 deletions
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6
js/src/jit/AsmJSModule.cpp
View File

@ -33,11 +33,13 @@ AsmJSModule::patchHeapAccesses(ArrayBufferObject *heap, JSContext *cx)
JSC::X86Assembler::setPointer(heapAccesses_[i].patchOffsetAt(code_), heapOffset);
}
#elif defined(JS_CPU_ARM)
jit::IonContext ic(cx, NULL);
jit::AutoFlushCache afc("patchBoundsCheck");
uint32_t bits = mozilla::CeilingLog2(heap->byteLength());
for (unsigned i = 0; i < heapAccesses_.length(); i++)
jit::Assembler::updateBoundsCheck(bits, (jit::Instruction*)(heapAccesses_[i].offset() + code_));
// We already know the exact extent of areas that need to be patched, just make sure we
// flush all of them at once.
jit::AutoFlushCache::updateTop(uintptr_t(code_), pod.codeBytes_);
#endif
}

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

@ -2589,7 +2589,7 @@ void
AutoFlushCache::updateTop(uintptr_t p, size_t len)
{
IonContext *ictx = GetIonContext();
IonRuntime *irt = ictx->runtime->ionRuntime();
IonRuntime *irt = (ictx != NULL) ? ictx->runtime->ionRuntime() : NULL;
if (!irt || !irt->flusher())
JSC::ExecutableAllocator::cacheFlush((void*)p, len);
else

3
js/src/jit/arm/Assembler-arm.cpp
View File

@ -2741,7 +2741,8 @@ void Assembler::updateBoundsCheck(uint32_t logHeapSize, Instruction *inst)
// O2RegImmShift shift = reg.toO2RegImmShift();
*inst = InstALU(ScratchRegister, InvalidReg, lsr(index, logHeapSize), op_mov, SetCond, Always);
AutoFlushCache::updateTop(uintptr_t(inst), 4);
// NOTE: we don't update the Auto Flush Cache! this function is currently only called from
// within AsmJSModule::patchHeapAccesses, which does that for us. Don't call this!
}
void