Small MessageLocation related refactoring.

src/messages.cc

 // Copyright 2011 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/messages.h"
 
 #include "src/api.h"
 #include "src/execution.h"
 #include "src/string-builder.h"
 
@@ skipping 15 matching lines @@
     base::SmartArrayPointer<char> data_str;
     if (data->IsString())
       data_str = Handle<String>::cast(data)->ToCString(DISALLOW_NULLS);
     PrintF("%s:%i: %s\n", data_str.get() ? data_str.get() : "<unknown>",
            loc->start_pos(), str.get());
   }
 }
 
 
 Handle<JSMessageObject> MessageHandler::MakeMessageObject(
-    Isolate* isolate, MessageTemplate::Template message, MessageLocation* loc,
-    Handle<Object> argument, Handle<JSArray> stack_frames) {
+    Isolate* isolate, MessageTemplate::Template message,
+    MessageLocation* location, Handle<Object> argument,
+    Handle<JSArray> stack_frames) {
   Factory* factory = isolate->factory();
 
-  int start = 0;
-  int end = 0;
+  int start = -1;
+  int end = -1;
   Handle<Object> script_handle = factory->undefined_value();
-  if (loc) {
-    start = loc->start_pos();
-    end = loc->end_pos();
-    script_handle = Script::GetWrapper(loc->script());
+  if (location != NULL) {
+    start = location->start_pos();
+    end = location->end_pos();
+    script_handle = Script::GetWrapper(location->script());
+  } else {
+    script_handle = Script::GetWrapper(isolate->factory()->empty_script());
   }
 
   Handle<Object> stack_frames_handle = stack_frames.is_null()
       ? Handle<Object>::cast(factory->undefined_value())
       : Handle<Object>::cast(stack_frames);
 
   Handle<JSMessageObject> message_obj = factory->NewJSMessageObject(
       message, argument, start, end, script_handle, stack_frames_handle);
 
   return message_obj;
@@ skipping 411 matching lines @@
   if (obj->IsUndefined()) return default_value;
   if (!obj->IsString()) {
     ASSIGN_RETURN_ON_EXCEPTION(isolate, obj, Execution::ToString(isolate, obj),
                                String);
   }
   return Handle<String>::cast(obj);
 }
 
 }  // namespace internal
 }  // namespace v8