Optimize loads from variables that might be shadowed by variables...

src/scopes.h

 // Copyright 2006-2008 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 148 matching lines @@
 
 
   // ---------------------------------------------------------------------------
   // Predicates.
 
   // Specific scope types.
   bool is_eval_scope() const  { return type_ == EVAL_SCOPE; }
   bool is_function_scope() const  { return type_ == FUNCTION_SCOPE; }
   bool is_global_scope() const  { return type_ == GLOBAL_SCOPE; }
 
+  // Information about which scopes calls eval.
+  bool calls_eval() const  { return scope_calls_eval_; }
+  bool outer_scope_calls_eval() const  { return outer_scope_calls_eval_; }
+
   // The scope immediately surrounding this scope, or NULL.
   Scope* outer_scope() const  { return outer_scope_; }
 
-
   // ---------------------------------------------------------------------------
   // Accessors.
 
   // The variable corresponding to the (function) receiver.
   VariableProxy* receiver() const  { return receiver_; }
 
   // The variable holding the function literal for named function
   // literals, or NULL.
   // Only valid for function scopes.
   Variable* function() const  {
@@ skipping 100 matching lines @@
   Expression* illegal_redecl_;
 
   // Scope-specific information.
   bool scope_inside_with_;  // this scope is inside a 'with' of some outer scope
   bool scope_contains_with_;  // this scope contains a 'with' statement
   bool scope_calls_eval_;  // this scope contains an 'eval' call
 
   // 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_;
 
   // Create a non-local variable with a given name.
   // These variables are looked up dynamically at runtime.
-  Variable* NonLocal(Handle<String> name);
+  Variable* NonLocal(Handle<String> name, Variable::Mode mode);
 
   // Variable resolution.
-  Variable* LookupRecursive(Handle<String> name, bool inner_lookup);
+  Variable* LookupRecursive(Handle<String> name,
+                            bool inner_lookup,
+                            Variable** invalidated_local);
   void ResolveVariable(Scope* global_scope, VariableProxy* proxy);
   void ResolveVariablesRecursively(Scope* global_scope);
 
   // Scope analysis.
-  bool PropagateScopeInfo(bool outer_scope_calls_eval);
+  bool PropagateScopeInfo(bool outer_scope_calls_eval,
+                          bool outer_scope_is_eval_scope);
   bool HasTrivialContext() const;
 
   // Predicates.
   bool MustAllocate(Variable* var);
   bool MustAllocateInContext(Variable* var);
   bool HasArgumentsParameter();
 
   // Variable allocation.
   void AllocateStackSlot(Variable* var);
   void AllocateHeapSlot(Variable* var);
@@ skipping 17 matching lines @@
   virtual VariableProxy* NewUnresolved(Handle<String> name, bool inside_with) {
     return NULL;
   }
   virtual VariableProxy* NewTemporary(Handle<String> name)  { return NULL; }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCOPES_H_