Add Object::IsNullOrUndefined(Isolate*) helper method

src/runtime/runtime-debug.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/arguments.h"
 #include "src/debug/debug-evaluate.h"
 #include "src/debug/debug-frames.h"
 #include "src/debug/debug-scopes.h"
@@ skipping 62 matching lines @@
 }
 
 
 // Adds a JavaScript function as a debug event listener.
 // args[0]: debug event listener function to set or null or undefined for
 //          clearing the event listener function
 // args[1]: object supplied during callback
 RUNTIME_FUNCTION(Runtime_SetDebugEventListener) {
   SealHandleScope shs(isolate);
   DCHECK_EQ(2, args.length());
-  CHECK(args[0]->IsJSFunction() || args[0]->IsUndefined(isolate) ||
-        args[0]->IsNull(isolate));
+  CHECK(args[0]->IsJSFunction() || args[0]->IsNullOrUndefined(isolate));
   CONVERT_ARG_HANDLE_CHECKED(Object, callback, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, data, 1);
   isolate->debug()->SetEventListener(callback, data);
 
   return isolate->heap()->undefined_value();
 }
 
 
 RUNTIME_FUNCTION(Runtime_ScheduleBreak) {
   SealHandleScope shs(isolate);
@@ skipping 1600 matching lines @@
 }
 
 Handle<Object> ScriptLocationFromLine(Isolate* isolate, Handle<Script> script,
                                       Handle<Object> opt_line,
                                       Handle<Object> opt_column,
                                       int32_t offset) {
   // Line and column are possibly undefined and we need to handle these cases,
   // additionally subtracting corresponding offsets.
 
   int32_t line = 0;
-  if (!opt_line->IsNull(isolate) && !opt_line->IsUndefined(isolate)) {
+  if (!opt_line->IsNullOrUndefined(isolate)) {
     CHECK(opt_line->IsNumber());
     line = NumberToInt32(*opt_line) - script->line_offset();
   }
 
   int32_t column = 0;
-  if (!opt_column->IsNull(isolate) && !opt_column->IsUndefined(isolate)) {
+  if (!opt_column->IsNullOrUndefined(isolate)) {
     CHECK(opt_column->IsNumber());
     column = NumberToInt32(*opt_column);
     if (line == 0) column -= script->column_offset();
   }
 
   int line_position = ScriptLinePositionWithOffset(script, line, offset);
   if (line_position < 0 || column < 0) return isolate->factory()->null_value();
 
   return GetJSPositionInfo(script, line_position + column, Script::NO_OFFSET,
                            isolate);
@@ skipping 193 matching lines @@
 }
 
 
 RUNTIME_FUNCTION(Runtime_DebugBreakInOptimizedCode) {
   UNIMPLEMENTED();
   return NULL;
 }
 
 }  // namespace internal
 }  // namespace v8