[es6] Initial steps towards a correct implementation of IsCallable.

src/bootstrapper.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.
 
 #include "src/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/api-natives.h"
 #include "src/base/utils/random-number-generator.h"
 #include "src/code-stubs.h"
@@ skipping 470 matching lines @@
                                  prototype, ro_attribs);
     map->AppendDescriptor(&d);
   }
 }
 
 
 Handle<Map> Genesis::CreateSloppyFunctionMap(FunctionMode function_mode) {
   Handle<Map> map = factory()->NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
   SetFunctionInstanceDescriptor(map, function_mode);
   map->set_function_with_prototype(IsFunctionModeWithPrototype(function_mode));
+  map->set_is_callable();
   return map;
 }
 
 
 Handle<JSFunction> Genesis::CreateEmptyFunction(Isolate* isolate) {
   // Allocate the map for function instances. Maps are allocated first and their
   // prototypes patched later, once empty function is created.
 
   // Functions with this map will not have a 'prototype' property, and
   // can not be used as constructors.
@@ skipping 219 matching lines @@
   }
   return strict_poison_function_;
 }
 
 
 Handle<Map> Genesis::CreateStrictFunctionMap(
     FunctionMode function_mode, Handle<JSFunction> empty_function) {
   Handle<Map> map = factory()->NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
   SetStrictFunctionInstanceDescriptor(map, function_mode);
   map->set_function_with_prototype(IsFunctionModeWithPrototype(function_mode));
+  map->set_is_callable();
   Map::SetPrototype(map, empty_function);
   return map;
 }
 
 
 Handle<Map> Genesis::CreateStrongFunctionMap(
     Handle<JSFunction> empty_function, bool is_constructor) {
   Handle<Map> map = factory()->NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
   SetStrongFunctionInstanceDescriptor(map);
   map->set_function_with_prototype(is_constructor);
   Map::SetPrototype(map, empty_function);
+  map->set_is_callable();
   map->set_is_extensible(is_constructor);
   map->set_is_strong();
   return map;
 }
 
 
 void Genesis::CreateStrictModeFunctionMaps(Handle<JSFunction> empty) {
   // Allocate map for the prototype-less strict mode instances.
   Handle<Map> strict_function_without_prototype_map =
       CreateStrictFunctionMap(FUNCTION_WITHOUT_PROTOTYPE, empty);
@@ skipping 286 matching lines @@
   native_context()->set_script_context_table(*script_context_table);
   InstallGlobalThisBinding();
 
   Handle<String> object_name = factory->Object_string();
   JSObject::AddProperty(
       global_object, object_name, isolate->object_function(), DONT_ENUM);
 
   Handle<JSObject> global(native_context()->global_object());
 
   // Install global Function object
-  InstallFunction(global, "Function", JS_FUNCTION_TYPE, JSFunction::kSize,
-                  empty_function, Builtins::kIllegal);
+  Handle<JSFunction> function_function =
+      InstallFunction(global, "Function", JS_FUNCTION_TYPE, JSFunction::kSize,
+                      empty_function, Builtins::kIllegal);
+  function_function->initial_map()->set_is_callable();
 
   {  // --- A r r a y ---
     Handle<JSFunction> array_function =
         InstallFunction(global, "Array", JS_ARRAY_TYPE, JSArray::kSize,
                         isolate->initial_object_prototype(),
                         Builtins::kArrayCode);
     array_function->shared()->DontAdaptArguments();
     array_function->shared()->set_function_data(Smi::FromInt(kArrayCode));
 
     // This seems a bit hackish, but we need to make sure Array.length
@@ skipping 1176 matching lines @@
         generator_function_prototype,
         static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY));
 
     JSObject::AddProperty(
         generator_function_prototype,
         factory()->InternalizeUtf8String("prototype"),
         generator_object_prototype,
         static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
 
     static const bool kUseStrictFunctionMap = true;
-    InstallFunction(builtins, "GeneratorFunction", JS_FUNCTION_TYPE,
-                    JSFunction::kSize, generator_function_prototype,
-                    Builtins::kIllegal, kUseStrictFunctionMap);
+    Handle<JSFunction> generator_function_function =
+        InstallFunction(builtins, "GeneratorFunction", JS_FUNCTION_TYPE,
+                        JSFunction::kSize, generator_function_prototype,
+                        Builtins::kIllegal, kUseStrictFunctionMap);
+    generator_function_function->initial_map()->set_is_callable();
 
     // Create maps for generator functions and their prototypes.  Store those
     // maps in the native context. The "prototype" property descriptor is
     // writable, non-enumerable, and non-configurable (as per ES6 draft
     // 04-14-15, section 25.2.4.3).
     Handle<Map> strict_function_map(strict_function_map_writable_prototype_);
     // Generator functions do not have "caller" or "arguments" accessors.
     Handle<Map> sloppy_generator_function_map =
         Map::Copy(strict_function_map, "SloppyGeneratorFunction");
     Map::SetPrototype(sloppy_generator_function_map,
@@ skipping 932 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8