X87: [stubs] Introduce ToNameStub to implement %_ToName.

src/x87/code-stubs-x87.cc

Index: src/x87/code-stubs-x87.cc
diff --git a/src/x87/code-stubs-x87.cc b/src/x87/code-stubs-x87.cc
index 9fd6ce68bd3968a75376f25231c1a3e14a9f674d..88bbf07cc88c3c3e59dd2333dd95a6ef95e8aa4e 100644
--- a/src/x87/code-stubs-x87.cc
+++ b/src/x87/code-stubs-x87.cc
@@ -2868,6 +2868,42 @@ void ToStringStub::Generate(MacroAssembler* masm) {
 }
 
 
+void ToNameStub::Generate(MacroAssembler* masm) {
+  // The ToName stub takes one argument in eax.
+  Label is_number;
+  __ JumpIfSmi(eax, &is_number, Label::kNear);
+
+  Label not_name;
+  STATIC_ASSERT(FIRST_NAME_TYPE == FIRST_TYPE);
+  __ CmpObjectType(eax, LAST_NAME_TYPE, edi);
+  // eax: receiver
+  // edi: receiver map
+  __ j(above, &not_name, Label::kNear);
+  __ Ret();
+  __ bind(&not_name);
+
+  Label not_heap_number;
+  __ CompareMap(eax, masm->isolate()->factory()->heap_number_map());
+  __ j(not_equal, &not_heap_number, Label::kNear);
+  __ bind(&is_number);
+  NumberToStringStub stub(isolate());
+  __ TailCallStub(&stub);
+  __ bind(&not_heap_number);
+
+  Label not_oddball;
+  __ CmpInstanceType(edi, ODDBALL_TYPE);
+  __ j(not_equal, &not_oddball, Label::kNear);
+  __ mov(eax, FieldOperand(eax, Oddball::kToStringOffset));
+  __ Ret();
+  __ bind(&not_oddball);
+
+  __ pop(ecx);   // Pop return address.
+  __ push(eax);  // Push argument.
+  __ push(ecx);  // Push return address.
+  __ TailCallRuntime(Runtime::kToName);
+}
+
+
 void StringHelper::GenerateFlatOneByteStringEquals(MacroAssembler* masm,
                                                    Register left,
                                                    Register right,