PPC: [runtime] Add %ToString and %_ToString and remove the TO_STRING builtin.

src/ppc/code-stubs-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 3383 matching lines @@
 }
 
 
 void ToNumberStub::Generate(MacroAssembler* masm) {
   // The ToNumber stub takes one argument in r3.
   Label not_smi;
   __ JumpIfNotSmi(r3, &not_smi);
   __ blr();
   __ bind(&not_smi);
 
-  Label not_heap_number;
-  __ LoadP(r4, FieldMemOperand(r3, HeapObject::kMapOffset));
-  __ lbz(r4, FieldMemOperand(r4, Map::kInstanceTypeOffset));
-  // r3: object
-  // r4: instance type.
-  __ cmpi(r4, Operand(HEAP_NUMBER_TYPE));
-  __ bne(&not_heap_number);
-  __ blr();
-  __ bind(&not_heap_number);
+  __ CompareObjectType(r3, r4, r4, HEAP_NUMBER_TYPE);
+  // r3: receiver
+  // r4: receiver instance type
+  __ Ret(eq);
 
   Label not_string, slow_string;
   __ cmpli(r4, Operand(FIRST_NONSTRING_TYPE));
   __ bge(&not_string);
   // Check if string has a cached array index.
   __ lwz(r5, FieldMemOperand(r3, String::kHashFieldOffset));
   __ And(r0, r5, Operand(String::kContainsCachedArrayIndexMask), SetRC);
   __ bne(&slow_string, cr0);
   __ IndexFromHash(r5, r3);
   __ blr();
   __ bind(&slow_string);
   __ push(r3);  // Push argument.
   __ TailCallRuntime(Runtime::kStringToNumber, 1, 1);
   __ bind(&not_string);
 
   Label not_oddball;
   __ cmpi(r4, Operand(ODDBALL_TYPE));
   __ bne(&not_oddball);
   __ LoadP(r3, FieldMemOperand(r3, Oddball::kToNumberOffset));
   __ blr();
   __ bind(&not_oddball);
 
   __ push(r3);  // Push argument.
   __ TailCallRuntime(Runtime::kToNumber, 1, 1);
 }
 
 
+void ToStringStub::Generate(MacroAssembler* masm) {
+  // The ToString stub takes one argument in r3.
+  Label is_number;
+  __ JumpIfSmi(r3, &is_number);
+
+  __ CompareObjectType(r3, r4, r4, FIRST_NONSTRING_TYPE);
+  // r3: receiver
+  // r4: receiver instance type
+  __ Ret(lt);
+
+  Label not_heap_number;
+  __ cmpi(r4, Operand(HEAP_NUMBER_TYPE));
+  __ bne(&not_heap_number);
+  __ bind(&is_number);
+  NumberToStringStub stub(isolate());
+  __ TailCallStub(&stub);
+  __ bind(&not_heap_number);
+
+  Label not_oddball;
+  __ cmpi(r4, Operand(ODDBALL_TYPE));
+  __ bne(&not_oddball);
+  __ LoadP(r3, FieldMemOperand(r3, Oddball::kToStringOffset));
+  __ Ret();
+  __ bind(&not_oddball);
+
+  __ push(r3);  // Push argument.
+  __ TailCallRuntime(Runtime::kToString, 1, 1);
+}
+
+
 void StringHelper::GenerateFlatOneByteStringEquals(MacroAssembler* masm,
                                                    Register left,
                                                    Register right,
                                                    Register scratch1,
                                                    Register scratch2) {
   Register length = scratch1;
 
   // Compare lengths.
   Label strings_not_equal, check_zero_length;
   __ LoadP(length, FieldMemOperand(left, String::kLengthOffset));
@@ skipping 2277 matching lines @@
                            kStackUnwindSpace, NULL,
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC