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

src/ia32/builtins-ia32.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_IA32
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
@@ skipping 976 matching lines @@
     __ CmpObjectType(ebx, FIRST_SPEC_OBJECT_TYPE, ecx);
     __ j(above_equal, &shift_arguments);
 
     __ bind(&convert_to_object);
 
     { // In order to preserve argument count.
       FrameScope scope(masm, StackFrame::INTERNAL);
       __ SmiTag(eax);
       __ push(eax);
 
-      __ push(ebx);
-      __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
+      __ mov(eax, ebx);
+      ToObjectStub stub(masm->isolate());
+      __ CallStub(&stub);
       __ mov(ebx, eax);
       __ Move(edx, Immediate(0));  // restore
 
       __ pop(eax);
       __ SmiUntag(eax);
     }
 
     // Restore the function to edi.
     __ mov(edi, Operand(esp, eax, times_4, 1 * kPointerSize));
     __ jmp(&patch_receiver);
@@ skipping 199 matching lines @@
     __ JumpIfSmi(ebx, &call_to_object);
     __ cmp(ebx, factory->null_value());
     __ j(equal, &use_global_proxy);
     __ cmp(ebx, factory->undefined_value());
     __ j(equal, &use_global_proxy);
     STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE);
     __ CmpObjectType(ebx, FIRST_SPEC_OBJECT_TYPE, ecx);
     __ j(above_equal, &push_receiver);
 
     __ bind(&call_to_object);
-    __ push(ebx);
-    __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
+    __ mov(eax, ebx);
+    ToObjectStub stub(masm->isolate());
+    __ CallStub(&stub);
     __ mov(ebx, eax);
     __ jmp(&push_receiver);
 
     __ bind(&use_global_proxy);
     __ mov(ebx,
            Operand(esi, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
     __ mov(ebx, FieldOperand(ebx, GlobalObject::kGlobalProxyOffset));
 
     // Push the receiver.
     __ bind(&push_receiver);
@@ skipping 529 matching lines @@
 
   __ bind(&ok);
   __ ret(0);
 }
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32