[es5] Class of object is "Function" if object has [[Call]].

src/full-codegen/arm64/full-codegen-arm64.cc

Index: src/full-codegen/arm64/full-codegen-arm64.cc
diff --git a/src/full-codegen/arm64/full-codegen-arm64.cc b/src/full-codegen/arm64/full-codegen-arm64.cc
index 65ceb7cdbc6684f0dcc394dcf1fa288aac7166bb..750895a8a2e93b95fe59dfde3664ae43ada7d5e9 100644
--- a/src/full-codegen/arm64/full-codegen-arm64.cc
+++ b/src/full-codegen/arm64/full-codegen-arm64.cc
@@ -3390,7 +3390,7 @@ void FullCodeGenerator::EmitArgumentsLength(CallRuntime* expr) {
 void FullCodeGenerator::EmitClassOf(CallRuntime* expr) {
   ASM_LOCATION("FullCodeGenerator::EmitClassOf");
   ZoneList<Expression*>* args = expr->arguments();
-  DCHECK(args->length() == 1);
+  DCHECK_EQ(1, args->length());
   Label done, null, function, non_function_constructor;
 
   VisitForAccumulatorValue(args->at(0));
@@ -3398,25 +3398,19 @@ void FullCodeGenerator::EmitClassOf(CallRuntime* expr) {
   // If the object is a smi, we return null.
   __ JumpIfSmi(x0, &null);
 
-  // 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);
-  __ CompareObjectType(x0, x10, x11, FIRST_SPEC_OBJECT_TYPE);
+  // If the object is not a receiver, we return null.
+  STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
+  __ CompareObjectType(x0, x10, x11, FIRST_JS_RECEIVER_TYPE);
   // x10: object's map.
   // x11: object's type.
   __ B(lt, &null);
-  STATIC_ASSERT(FIRST_NONCALLABLE_SPEC_OBJECT_TYPE ==
-                FIRST_SPEC_OBJECT_TYPE + 1);
-  __ B(eq, &function);
-
-  __ Cmp(x11, LAST_SPEC_OBJECT_TYPE);
-  STATIC_ASSERT(LAST_NONCALLABLE_SPEC_OBJECT_TYPE ==
-                LAST_SPEC_OBJECT_TYPE - 1);
-  __ B(eq, &function);
-  // Assume that there is no larger type.
-  STATIC_ASSERT(LAST_NONCALLABLE_SPEC_OBJECT_TYPE == LAST_TYPE - 1);
+
+  // According to ES5 section 15 Standard Built-in ECMAScript Objects, the
+  // [[Class]] of builtin objects is "Function" if a [[Call]] internal
+  // method is present.
+  __ Ldrb(x11, FieldMemOperand(x10, Map::kBitFieldOffset));
+  __ Tst(x11, 1 << Map::kIsCallable);
+  __ B(ne, &function);
 
   // Check if the constructor in the map is a JS function.
   Register instance_type = x14;