Make closures optimizable by Crankshaft compiler.

src/scopes.h

 // Copyright 2010 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 284 matching lines @@
   void Print(int n = 0);  // n = indentation; n < 0 => don't print recursively
 #endif
 
   // ---------------------------------------------------------------------------
   // Implementation.
  protected:
   friend class ParserFactory;
 
   explicit Scope(Type type);
 
+  void InsertAfterScope(Scope* scope) {
+    inner_scopes_.Add(scope);
+    outer_scope_ = scope->outer_scope_;
+    outer_scope_->inner_scopes_.RemoveElement(scope);
+    outer_scope_->inner_scopes_.Add(this);
+    scope->outer_scope_ = this;
+  }
+
   // Scope tree.
   Scope* outer_scope_;  // the immediately enclosing outer scope, or NULL
   ZoneList<Scope*> inner_scopes_;  // the immediately enclosed inner scopes
 
   // The scope type.
   Type type_;
 
   // Debugging support.
   Handle<String> scope_name_;
 
@@ skipping 33 matching lines @@
   // Computed via PropagateScopeInfo.
   bool outer_scope_calls_eval_;
   bool inner_scope_calls_eval_;
   bool outer_scope_is_eval_scope_;
   bool force_eager_compilation_;
 
   // Computed via AllocateVariables; function scopes only.
   int num_stack_slots_;
   int num_heap_slots_;
 
+  // Serialized scopes support.
+  SerializedScopeInfo* scope_info_;
+  bool resolved() { return scope_info_ != NULL; }
+
   // Create a non-local variable with a given name.
   // These variables are looked up dynamically at runtime.
   Variable* NonLocal(Handle<String> name, Variable::Mode mode);
 
   // Variable resolution.
   Variable* LookupRecursive(Handle<String> name,
                             bool inner_lookup,
                             Variable** invalidated_local);
   void ResolveVariable(Scope* global_scope,
                        Handle<Context> context,
@@ skipping 11 matching lines @@
   bool MustAllocateInContext(Variable* var);
   bool HasArgumentsParameter();
 
   // Variable allocation.
   void AllocateStackSlot(Variable* var);
   void AllocateHeapSlot(Variable* var);
   void AllocateParameterLocals();
   void AllocateNonParameterLocal(Variable* var);
   void AllocateNonParameterLocals();
   void AllocateVariablesRecursively();
+
+ private:
+  Scope(Scope* inner_scope, SerializedScopeInfo* scope_info);
+
+  void SetDefaults(Type type,
+                   Scope* outer_scope,
+                   SerializedScopeInfo* scope_info) {
+    outer_scope_ = outer_scope;
+    type_ = type;
+    scope_name_ = Factory::empty_symbol();
+    dynamics_ = NULL;
+    receiver_ = NULL;
+    function_ = NULL;
+    arguments_ = NULL;
+    arguments_shadow_ = NULL;
+    illegal_redecl_ = NULL;
+    scope_inside_with_ = false;
+    scope_contains_with_ = false;
+    scope_calls_eval_ = false;
+    outer_scope_calls_eval_ = false;
+    inner_scope_calls_eval_ = false;
+    outer_scope_is_eval_scope_ = false;
+    force_eager_compilation_ = false;
+    num_stack_slots_ = 0;
+    num_heap_slots_ = 0;
+    scope_info_ = scope_info;
+  }
 };
 
 
 // Scope used during pre-parsing.
 class DummyScope : public Scope {
  public:
   DummyScope()
       : Scope(GLOBAL_SCOPE),
         nesting_level_(1),  // Allows us to Leave the initial scope.
         inside_with_level_(kNotInsideWith) {
@@ skipping 36 matching lines @@
   int nesting_level_;
   // Nesting level of outermost scope that is contained in a with statement,
   // or kNotInsideWith if there are no with's around the current scope.
   int inside_with_level_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCOPES_H_