[stubs] Unify (and optimize) implementation of ToObject.

src/full-codegen/mips/full-codegen-mips.cc

 // Copyright 2012 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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_MIPS
 
 // Note on Mips implementation:
 //
@@ skipping 1067 matching lines @@
   __ LoadRoot(null_value, Heap::kNullValueRootIndex);
   __ Branch(&exit, eq, a0, Operand(null_value));
   PrepareForBailoutForId(stmt->PrepareId(), TOS_REG);
   __ mov(a0, v0);
   // Convert the object to a JS object.
   Label convert, done_convert;
   __ JumpIfSmi(a0, &convert);
   __ GetObjectType(a0, a1, a1);
   __ Branch(&done_convert, ge, a1, Operand(FIRST_SPEC_OBJECT_TYPE));
   __ bind(&convert);
-  __ push(a0);
-  __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
+  ToObjectStub stub(isolate());
+  __ CallStub(&stub);
   __ mov(a0, v0);
   __ bind(&done_convert);
   PrepareForBailoutForId(stmt->ToObjectId(), TOS_REG);
   __ push(a0);
 
   // Check for proxies.
   Label call_runtime;
   STATIC_ASSERT(FIRST_JS_PROXY_TYPE == FIRST_SPEC_OBJECT_TYPE);
   __ GetObjectType(a0, a1, a1);
   __ Branch(&call_runtime, le, a1, Operand(LAST_JS_PROXY_TYPE));
@@ skipping 2921 matching lines @@
   // Load the argument into a0 and call the stub.
   VisitForAccumulatorValue(args->at(0));
   __ mov(a0, result_register());
 
   NumberToStringStub stub(isolate());
   __ CallStub(&stub);
   context()->Plug(v0);
 }
 
 
+void FullCodeGenerator::EmitToObject(CallRuntime* expr) {
+  ZoneList<Expression*>* args = expr->arguments();
+  DCHECK_EQ(1, args->length());
+
+  // Load the argument into a0 and convert it.
+  VisitForAccumulatorValue(args->at(0));
+  __ mov(a0, result_register());
+
+  ToObjectStub stub(isolate());
+  __ CallStub(&stub);
+  context()->Plug(v0);
+}
+
+
 void FullCodeGenerator::EmitStringCharFromCode(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 1);
 
   VisitForAccumulatorValue(args->at(0));
 
   Label done;
   StringCharFromCodeGenerator generator(v0, a1);
   generator.GenerateFast(masm_);
   __ jmp(&done);
@@ skipping 1380 matching lines @@
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OsrAfterStackCheck()->entry()));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS