Add a second kind of HandleScope that ties the lifetime of Handles created in its scope to the life…

src/compiler.h

 // Copyright 2012 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 27 matching lines @@
 class ScriptDataImpl;
 
 // CompilationInfo encapsulates some information known at compile time.  It
 // is constructed based on the resources available at compile-time.
 class CompilationInfo BASE_EMBEDDED {
  public:
   CompilationInfo(Handle<Script> script, Zone* zone);
   CompilationInfo(Handle<SharedFunctionInfo> shared_info, Zone* zone);
   CompilationInfo(Handle<JSFunction> closure, Zone* zone);
 
+  ~CompilationInfo();
+
   Isolate* isolate() {
     ASSERT(Isolate::Current() == isolate_);
     return isolate_;
   }
   Zone* zone() {
     return zone_;
   }
   bool is_lazy() const { return IsLazy::decode(flags_); }
   bool is_eval() const { return IsEval::decode(flags_); }
   bool is_global() const { return IsGlobal::decode(flags_); }
@@ skipping 108 matching lines @@
     flags_ |= SupportsDeoptimization::encode(true);
   }
 
   // Determines whether or not to insert a self-optimization header.
   bool ShouldSelfOptimize();
 
   // Disable all optimization attempts of this info for the rest of the
   // current compilation pipeline.
   void AbortOptimization();
 
+  void RememberHiddenExtensions(

[Erik Corry, 2012/06/22 11:08:36]

Could be called StorePersistentExtensions.

[sanjoy, 2012/06/22 20:08:10]

Fixed.

+      HandleScopeImplementer::HiddenExtensions* extensions) {
+    ASSERT(!hidden_extensions_);
+    hidden_extensions_ = extensions;
+  }
+
  private:
   Isolate* isolate_;
 
   // Compilation mode.
   // BASE is generated by the full codegen, optionally prepared for bailouts.
   // OPTIMIZE is optimized code generated by the Hydrogen-based backend.
   // NONOPT is generated by the full codegen and is not prepared for
   //   recompilation/bailouts.  These functions are never recompiled.
   enum Mode {
     BASE,
@@ skipping 66 matching lines @@
   Handle<Context> calling_context_;
 
   // Compilation mode flag and whether deoptimization is allowed.
   Mode mode_;
   int osr_ast_id_;
 
   // The zone from which the compilation pipeline working on this
   // CompilationInfo allocates.
   Zone* zone_;
 
+  HandleScopeImplementer::HiddenExtensions* hidden_extensions_;
+
   DISALLOW_COPY_AND_ASSIGN(CompilationInfo);
 };
 
 
 // Exactly like a CompilationInfo, except also creates and enters a
 // Zone on construction and deallocates it on exit.
 class CompilationInfoWithZone: public CompilationInfo {
  public:
   explicit CompilationInfoWithZone(Handle<Script> script)
       : CompilationInfo(script, &zone_),
@@ skipping 78 matching lines @@
 
   static void RecordFunctionCompilation(Logger::LogEventsAndTags tag,
                                         CompilationInfo* info,
                                         Handle<SharedFunctionInfo> shared);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILER_H_