[runtime] Drop FIRST/LAST_NONCALLABLE_SPEC_OBJECT instance type range.

src/full-codegen/x64/full-codegen-x64.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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 3172 matching lines @@
 }
 
 
 void FullCodeGenerator::EmitClassOf(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 1);
   Label done, null, function, non_function_constructor;
 
   VisitForAccumulatorValue(args->at(0));
 
-  // If the object is a smi, we return null.
-  __ JumpIfSmi(rax, &null);
+  // If the object is not a JSReceiver, we return null.
+  __ JumpIfSmi(rax, &null, Label::kNear);
+  STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
+  __ CmpObjectType(rax, FIRST_JS_RECEIVER_TYPE, rax);
+  __ j(below, &null, Label::kNear);
 
-  // Check that the object is a JS object but take special care of JS
-  // functions to make sure they have 'Function' as their class.
-  // Assume that there are only two callable types, and one of them is at
-  // either end of the type range for JS object types. Saves extra comparisons.
-  STATIC_ASSERT(NUM_OF_CALLABLE_SPEC_OBJECT_TYPES == 2);
-  __ CmpObjectType(rax, FIRST_JS_RECEIVER_TYPE, rax);
-  // Map is now in rax.
-  __ j(below, &null);
-
-  __ CmpInstanceType(rax, LAST_JS_RECEIVER_TYPE);
-  STATIC_ASSERT(LAST_NONCALLABLE_SPEC_OBJECT_TYPE ==
-                LAST_JS_RECEIVER_TYPE - 1);
-  __ j(equal, &function);
-  // Assume that there is no larger type.
-  STATIC_ASSERT(LAST_NONCALLABLE_SPEC_OBJECT_TYPE == LAST_TYPE - 1);
+  // Return 'Function' for JSFunction objects.
+  __ CmpInstanceType(rax, JS_FUNCTION_TYPE);
+  __ j(equal, &function, Label::kNear);
 
   // Check if the constructor in the map is a JS function.
   __ GetMapConstructor(rax, rax, rbx);
   __ CmpInstanceType(rbx, JS_FUNCTION_TYPE);
-  __ j(not_equal, &non_function_constructor);
+  __ j(not_equal, &non_function_constructor, Label::kNear);
 
   // rax now contains the constructor function. Grab the
   // instance class name from there.
   __ movp(rax, FieldOperand(rax, JSFunction::kSharedFunctionInfoOffset));
   __ movp(rax, FieldOperand(rax, SharedFunctionInfo::kInstanceClassNameOffset));
-  __ jmp(&done);
-
-  // Functions have class 'Function'.
-  __ bind(&function);
-  __ Move(rax, isolate()->factory()->Function_string());
-  __ jmp(&done);
-
-  // Objects with a non-function constructor have class 'Object'.
-  __ bind(&non_function_constructor);
-  __ Move(rax, isolate()->factory()->Object_string());
-  __ jmp(&done);
+  __ jmp(&done, Label::kNear);
 
   // Non-JS objects have class null.
   __ bind(&null);
   __ LoadRoot(rax, Heap::kNullValueRootIndex);
+  __ jmp(&done, Label::kNear);
+
+  // Functions have class 'Function'.
+  __ bind(&function);
+  __ LoadRoot(rax, Heap::kFunction_stringRootIndex);
+  __ jmp(&done, Label::kNear);
+
+  // Objects with a non-function constructor have class 'Object'.
+  __ bind(&non_function_constructor);
+  __ LoadRoot(rax, Heap::kObject_stringRootIndex);
 
   // All done.
   __ bind(&done);
 
   context()->Plug(rax);
 }
 
 
 void FullCodeGenerator::EmitValueOf(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
@@ skipping 1535 matching lines @@
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64