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MIPS: port Implement Harmony semantics for typeof null (behind a flag).

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Port r8876 (2aeeae7)

Original commit message:
Harmony is intended to make typeof null === "null". This may
break existing programs. Implementing it will allow us to run
some tests on the actual web.

BUG=
TEST=

Review URL: http://codereview.chromium.org/7650009
Patch from Paul Lind <plind44@gmail.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8939 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
rossberg@chromium.org 2011-08-16 10:08:50 +00:00
parent af112fda75
commit b1ae597808
1 changed files with 8 additions and 2 deletions
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10
src/mips/full-codegen-mips.cc
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@ -4052,6 +4052,10 @@ void FullCodeGenerator::EmitLiteralCompareTypeof(Expression* expr,
__ Branch(if_true, eq, v0, Operand(at));
__ LoadRoot(at, Heap::kFalseValueRootIndex);
Split(eq, v0, Operand(at), if_true, if_false, fall_through);
} else if (FLAG_harmony_typeof &&
check->Equals(isolate()->heap()->null_symbol())) {
__ LoadRoot(at, Heap::kNullValueRootIndex);
Split(eq, v0, Operand(at), if_true, if_false, fall_through);
} else if (check->Equals(isolate()->heap()->undefined_symbol())) {
__ LoadRoot(at, Heap::kUndefinedValueRootIndex);
__ Branch(if_true, eq, v0, Operand(at));
@ -4069,8 +4073,10 @@ void FullCodeGenerator::EmitLiteralCompareTypeof(Expression* expr,
} else if (check->Equals(isolate()->heap()->object_symbol())) {
__ JumpIfSmi(v0, if_false);
__ LoadRoot(at, Heap::kNullValueRootIndex);
__ Branch(if_true, eq, v0, Operand(at));
if (!FLAG_harmony_typeof) {
__ LoadRoot(at, Heap::kNullValueRootIndex);
__ Branch(if_true, eq, v0, Operand(at));
}
// Check for JS objects => true.
__ GetObjectType(v0, v0, a1);
__ Branch(if_false, lt, a1, Operand(FIRST_NONCALLABLE_SPEC_OBJECT_TYPE));