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

port a0878333de4dd090f9d8987e1698a9eef9cc7219(r33460)

  original commit message:
  We already had hand-written optimized code for %_ToName in fullcodegen,
  but the optimizing compilers always went to the runtime for %_ToName,
  which is pretty bad for many of our builtins. So this CL moves the
  existing native code to a ToNameStub (similar to the existing
  ToStringStub), and uses the ToNameStub consistently in all compilers to
  actually implement %_ToName.

BUG=

Review URL: https://codereview.chromium.org/1622793006

Cr-Commit-Position: refs/heads/master@{#33483}

src/full-codegen/x87/full-codegen-x87.cc

@@ -3409,27 +3409,6 @@ void FullCodeGenerator::EmitToInteger(CallRuntime* expr) {
 }
 
 
-void FullCodeGenerator::EmitToName(CallRuntime* expr) {
-  ZoneList<Expression*>* args = expr->arguments();
-  DCHECK_EQ(1, args->length());
-
-  // Load the argument into eax and convert it.
-  VisitForAccumulatorValue(args->at(0));
-
-  // Convert the object to a name.
-  Label convert, done_convert;
-  __ JumpIfSmi(eax, &convert, Label::kNear);
-  STATIC_ASSERT(FIRST_NAME_TYPE == FIRST_TYPE);
-  __ CmpObjectType(eax, LAST_NAME_TYPE, ecx);
-  __ j(below_equal, &done_convert, Label::kNear);
-  __ bind(&convert);
-  __ Push(eax);
-  __ CallRuntime(Runtime::kToName);
-  __ bind(&done_convert);
-  context()->Plug(eax);
-}
-
-
 void FullCodeGenerator::EmitStringCharFromCode(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 1);

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,

src/x87/interface-descriptors-x87.cc

@@ -118,6 +118,10 @@ const Register ToLengthDescriptor::ReceiverRegister() { return eax; }
 const Register ToStringDescriptor::ReceiverRegister() { return eax; }
 
 
+// static
+const Register ToNameDescriptor::ReceiverRegister() { return eax; }
+
+
 // static
 const Register ToObjectDescriptor::ReceiverRegister() { return eax; }