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MIPS: Prefill pre-allocated memory of folded allocation with one pointer fillers when heap verifier is on.

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Port r15798 (3b92806)

BUG=

Review URL: https://codereview.chromium.org/19485006
Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15809 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
palfia@homejinni.com 2013-07-22 18:16:44 +00:00
parent b2dd5c67f7
commit d6e54c5f58
1 changed files with 19 additions and 0 deletions
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19
src/mips/lithium-codegen-mips.cc
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@ -5323,6 +5323,25 @@ void LCodeGen::DoAllocate(LAllocate* instr) {
}
__ bind(deferred->exit());
if (instr->hydrogen()->MustPrefillWithFiller()) {
if (instr->size()->IsConstantOperand()) {
int32_t size = ToInteger32(LConstantOperand::cast(instr->size()));
__ li(scratch, Operand(size));
} else {
scratch = ToRegister(instr->size());
}
__ Subu(scratch, scratch, Operand(kPointerSize));
__ Subu(result, result, Operand(kHeapObjectTag));
Label loop;
__ bind(&loop);
__ li(scratch2, Operand(isolate()->factory()->one_pointer_filler_map()));
__ Addu(at, result, Operand(scratch));
__ sw(scratch2, MemOperand(at));
__ Subu(scratch, scratch, Operand(kPointerSize));
__ Branch(&loop, ge, scratch, Operand(zero_reg));
__ Addu(result, result, Operand(kHeapObjectTag));
}
}