Introduce scopes to keep track of catch blocks at compile time.

src/ast.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 754 matching lines @@
   virtual bool IsInlineable() const;
 
  private:
   Block* try_block_;
   ZoneList<Label*>* escaping_targets_;
 };
 
 
 class TryCatchStatement: public TryStatement {
  public:
-  TryCatchStatement(Block* try_block, Handle<String> name, Block* catch_block)
+  TryCatchStatement(Block* try_block,
+                    Scope* scope,
+                    Variable* variable,
+                    Block* catch_block)
       : TryStatement(try_block),
-        name_(name),
+        scope_(scope),
+        variable_(variable),
         catch_block_(catch_block) {
   }
 
   DECLARE_NODE_TYPE(TryCatchStatement)
 
+  Scope* scope() { return scope_; }
+  Variable* variable() { return variable_; }
   Block* catch_block() const { return catch_block_; }
-  Handle<String> name() const { return name_; }
   virtual bool IsInlineable() const;
 
  private:
-  Handle<String> name_;
+  Scope* scope_;
+  Variable* variable_;
   Block* catch_block_;
 };
 
 
 class TryFinallyStatement: public TryStatement {
  public:
   TryFinallyStatement(Block* try_block, Block* finally_block)
       : TryStatement(try_block),
         finally_block_(finally_block) { }
 
@@ skipping 1340 matching lines @@
 
  private:
   Isolate* isolate_;
   bool stack_overflow_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_