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

src/runtime/runtime-function.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/runtime/runtime-utils.h"
 
 #include "src/accessors.h"
 #include "src/arguments.h"
 #include "src/compiler.h"
 #include "src/cpu-profiler.h"
 #include "src/deoptimizer.h"
 #include "src/frames-inl.h"
 #include "src/messages.h"
 
 namespace v8 {
 namespace internal {
 
 RUNTIME_FUNCTION(Runtime_IsSloppyModeFunction) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_CHECKED(JSReceiver, callable, 0);
   if (!callable->IsJSFunction()) {
     HandleScope scope(isolate);
-    Handle<Object> delegate;
+    Handle<JSFunction> delegate;
     ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-        isolate, delegate, Execution::TryGetFunctionDelegate(
-                               isolate, Handle<JSReceiver>(callable)));
+        isolate, delegate,
+        Execution::GetFunctionDelegate(isolate, Handle<JSReceiver>(callable)));
     callable = JSFunction::cast(*delegate);
   }
   JSFunction* function = JSFunction::cast(callable);
   SharedFunctionInfo* shared = function->shared();
   return isolate->heap()->ToBoolean(is_sloppy(shared->language_mode()));
 }
 
 
 RUNTIME_FUNCTION(Runtime_FunctionGetName) {
   SealHandleScope shs(isolate);
@@ skipping 469 matching lines @@
   base::SmartArrayPointer<Handle<Object> > param_data =
       GetCallerArguments(isolate, bound_argc, &total_argc);
   for (int i = 0; i < bound_argc; i++) {
     param_data[i] = Handle<Object>(
         bound_args->get(JSFunction::kBoundArgumentsStartIndex + i), isolate);
   }
 
   if (!bound_function->IsJSFunction()) {
     ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
         isolate, bound_function,
-        Execution::TryGetConstructorDelegate(isolate, bound_function));
+        Execution::GetConstructorDelegate(isolate, bound_function));
   }
   DCHECK(bound_function->IsJSFunction());
 
   Handle<Object> result;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, result, Execution::New(Handle<JSFunction>::cast(bound_function),
                                       total_argc, param_data.get()));
   return *result;
 }
 
@@ skipping 66 matching lines @@
       Execution::Call(isolate, fun, receiver, argc, argv, true));
   return *result;
 }
 
 
 RUNTIME_FUNCTION(Runtime_GetFunctionDelegate) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
   RUNTIME_ASSERT(!object->IsJSFunction());
-  return *Execution::GetFunctionDelegate(isolate, object);
+  Handle<JSFunction> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, result, Execution::GetFunctionDelegate(isolate, object));
+  return *result;
 }
 
 
 RUNTIME_FUNCTION(Runtime_GetConstructorDelegate) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
   RUNTIME_ASSERT(!object->IsJSFunction());
-  return *Execution::GetConstructorDelegate(isolate, object);
+  Handle<JSFunction> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, result, Execution::GetConstructorDelegate(isolate, object));
+  return *result;
 }
 
 
 RUNTIME_FUNCTION(Runtime_GetOriginalConstructor) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 0);
   JavaScriptFrameIterator it(isolate);
   JavaScriptFrame* frame = it.frame();
   return frame->IsConstructor() ? frame->GetOriginalConstructor()
                                 : isolate->heap()->undefined_value();
@@ skipping 24 matching lines @@
 
 
 RUNTIME_FUNCTION(Runtime_ThrowStrongModeTooFewArguments) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 0);
   THROW_NEW_ERROR_RETURN_FAILURE(isolate,
                                  NewTypeError(MessageTemplate::kStrongArity));
 }
 }  // namespace internal
 }  // namespace v8