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Fix stack alignment issue with the new fast Math.random() code

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under Mac OS.
Review URL: http://codereview.chromium.org/125123

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2168 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
kasperl@chromium.org 2009-06-15 13:17:09 +00:00
parent c1d0401b3d
commit 7f27314644
1 changed files with 16 additions and 0 deletions
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16
src/ia32/codegen-ia32.cc
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@ -4943,7 +4943,23 @@ void CodeGenerator::GenerateGetFramePointer(ZoneList<Expression*>* args) {
void CodeGenerator::GenerateRandomPositiveSmi(ZoneList<Expression*>* args) {
ASSERT(args->length() == 0);
frame_->SpillAll();
// Make sure the frame is aligned like the OS expects.
static const int kFrameAlignment = OS::ActivationFrameAlignment();
if (kFrameAlignment > 0) {
ASSERT(IsPowerOf2(kFrameAlignment));
__ mov(edi, Operand(esp)); // Save in callee-saved register.
__ and_(esp, -kFrameAlignment);
}
// Call V8::RandomPositiveSmi().
__ call(FUNCTION_ADDR(V8::RandomPositiveSmi), RelocInfo::RUNTIME_ENTRY);
// Restore stack pointer from callee-saved register edi.
if (kFrameAlignment > 0) {
__ mov(esp, Operand(edi));
}
Result result = allocator_->Allocate(eax);
frame_->Push(&result);
}