Rewrite Error.prototype.toString in C++.

src/runtime/runtime-internal.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/v8.h"
 
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/debug/debug.h"
 #include "src/messages.h"
@@ skipping 235 matching lines @@
 
 
 RUNTIME_FUNCTION(Runtime_MessageGetScript) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_CHECKED(JSMessageObject, message, 0);
   return message->script();
 }
 
 
+RUNTIME_FUNCTION(Runtime_ErrorToStringRT) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, error, 0);
+  Handle<String> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, result,
+      isolate->error_tostring_helper()->Stringify(isolate, error));
+  return *result;
+}
+
+
 RUNTIME_FUNCTION(Runtime_FormatMessageString) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 4);
   CONVERT_INT32_ARG_CHECKED(template_index, 0);
   CONVERT_ARG_HANDLE_CHECKED(String, arg0, 1);
   CONVERT_ARG_HANDLE_CHECKED(String, arg1, 2);
   CONVERT_ARG_HANDLE_CHECKED(String, arg2, 3);
   Handle<String> result;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, result,
@@ skipping 99 matching lines @@
 }
 
 
 RUNTIME_FUNCTION(Runtime_GetCodeStubExportsObject) {
   HandleScope shs(isolate);
   return isolate->heap()->code_stub_exports_object();
 }
 
 }  // namespace internal
 }  // namespace v8