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Bug 995704 - Make Ion jitcode incrementally touch huge stack frames to avoid crashes on windows. r=sunfish

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This commit is contained in:
Kannan Vijayan 2014-04-30 12:09:32 -04:00
parent dff9bd8e4c
commit 5d4ad61dc8
1 changed files with 13 additions and 1 deletions
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14
js/src/jit/CodeGenerator.cpp
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@ -2728,7 +2728,19 @@ CodeGenerator::generateArgumentsChecks(bool bailout)
// Reserve the amount of stack the actual frame will use. We have to undo
// this before falling through to the method proper though, because the
// monomorphic call case will bypass this entire path.
masm.reserveStack(frameSize());
// On windows, we cannot skip very far down the stack without touching the
// memory pages in-between. This is a corner-case code for situations where the
// Ion frame data for a piece of code is very large. To handle this special case,
// for frames over 1k in size we allocate memory on the stack incrementally, touching
// it as we go.
uint32_t frameSizeLeft = frameSize();
while (frameSizeLeft > 1024) {
masm.reserveStack(1024);
masm.store32(Imm32(0), Address(StackPointer, 0));
frameSizeLeft -= 1024;
}
masm.reserveStack(frameSizeLeft);
// No registers are allocated yet, so it's safe to grab anything.
Register temp = GeneralRegisterSet(EntryTempMask).getAny();