Refactor parser Checkpoints.

src/parser.cc

 // Copyright 2012 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/api.h"
 #include "src/ast.h"
 #include "src/base/platform/platform.h"
 #include "src/bootstrapper.h"
@@ skipping 323 matching lines @@
 
 #define CHECK_FAILED  /**/);   \
   if (failed_) return NULL; \
   ((void)0
 #define DUMMY )  // to make indentation work
 #undef DUMMY
 
 // ----------------------------------------------------------------------------
 // Implementation of Parser
 
+class ParserTraits::Checkpoint
+    : public ParserBase<ParserTraits>::CheckpointBase {
+ public:
+  explicit Checkpoint(ParserBase<ParserTraits>* parser)
+      : CheckpointBase(parser) {
+    isolate_ = parser->zone()->isolate();
+    saved_ast_node_id_ = isolate_->ast_node_id();
+  }
+
+  void Restore() {
+    CheckpointBase::Restore();
+    isolate_->set_ast_node_id(saved_ast_node_id_);
+  }
+
+ private:
+  Isolate* isolate_;
+  int saved_ast_node_id_;
+};
+
+
 bool ParserTraits::IsEvalOrArguments(const AstRawString* identifier) const {
   return identifier == parser_->ast_value_factory_->eval_string() ||
          identifier == parser_->ast_value_factory_->arguments_string();
 }
 
 
 bool ParserTraits::IsThisProperty(Expression* expression) {
   DCHECK(expression != NULL);
   Property* property = expression->AsProperty();
   return property != NULL &&
@@ skipping 4456 matching lines @@
     info()->SetAstValueFactory(ast_value_factory_);
   }
   ast_value_factory_ = NULL;
 
   InternalizeUseCounts();
 
   return (result != NULL);
 }
 
 } }  // namespace v8::internal