Use placement new for zone objects in hydrogen.

src/hydrogen.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 123 matching lines @@
 
   // If a target block is tagged as an inline function return, all
   // predecessors should contain the inlined exit sequence:
   //
   // LeaveInlined
   // Simulate (caller's environment)
   // Goto (target block)
   bool IsInlineReturnTarget() const { return is_inline_return_target_; }
   void MarkAsInlineReturnTarget() { is_inline_return_target_ = true; }
 
+  inline Zone* zone();
+
 #ifdef DEBUG
   void Verify();
 #endif
 
  private:
   void RegisterPredecessor(HBasicBlock* pred);
   void AddDominatedBlock(HBasicBlock* block);
 
   HSimulate* CreateSimulate(int id);
   HDeoptimize* CreateDeoptimize();
@@ skipping 40 matching lines @@
   ZoneList<HBasicBlock*> back_edges_;
   HBasicBlock* loop_header_;
   ZoneList<HBasicBlock*> blocks_;
 };
 
 
 class HGraph: public ZoneObject {
  public:
   explicit HGraph(CompilationInfo* info);
 
+  Isolate* isolate() { return isolate_; }
+  Zone* zone() { return isolate_->zone(); }
+
   const ZoneList<HBasicBlock*>* blocks() const { return &blocks_; }
   const ZoneList<HPhi*>* phi_list() const { return phi_list_; }
   HBasicBlock* entry_block() const { return entry_block_; }
   HEnvironment* start_environment() const { return start_environment_; }
 
   void InitializeInferredTypes();
   void InsertTypeConversions();
   void InsertRepresentationChanges();
   void ComputeMinusZeroChecks();
   bool ProcessArgumentsObject();
@@ skipping 60 matching lines @@
   void InsertRepresentationChangeForUse(HValue* value,
                                         HValue* use,
                                         Representation to);
   void InsertRepresentationChangesForValue(HValue* current,
                                            ZoneList<HValue*>* value_list,
                                            ZoneList<Representation>* rep_list);
   void InferTypes(ZoneList<HValue*>* worklist);
   void InitializeInferredTypes(int from_inclusive, int to_inclusive);
   void CheckForBackEdge(HBasicBlock* block, HBasicBlock* successor);
 
-  Isolate* isolate() { return isolate_; }
-
   Isolate* isolate_;
   int next_block_id_;
   HBasicBlock* entry_block_;
   HEnvironment* start_environment_;
   ZoneList<HBasicBlock*> blocks_;
   ZoneList<HValue*> values_;
   ZoneList<HPhi*>* phi_list_;
   SetOncePointer<HConstant> undefined_constant_;
   SetOncePointer<HConstant> constant_1_;
   SetOncePointer<HConstant> constant_minus1_;
   SetOncePointer<HConstant> constant_true_;
   SetOncePointer<HConstant> constant_false_;
   SetOncePointer<HArgumentsObject> arguments_object_;
 
   DISALLOW_COPY_AND_ASSIGN(HGraph);
 };
 
 
+Zone* HBasicBlock::zone() { return graph_->zone(); }
+
+
 class HEnvironment: public ZoneObject {
  public:
   HEnvironment(HEnvironment* outer,
                Scope* scope,
                Handle<JSFunction> closure);
 
   // Simple accessors.
   Handle<JSFunction> closure() const { return closure_; }
   const ZoneList<HValue*>* values() const { return &values_; }
   const ZoneList<int>* assigned_variables() const {
@@ skipping 141 matching lines @@
 
   void set_for_typeof(bool for_typeof) { for_typeof_ = for_typeof; }
   bool is_for_typeof() { return for_typeof_; }
 
  protected:
   AstContext(HGraphBuilder* owner, Expression::Context kind);
   virtual ~AstContext();
 
   HGraphBuilder* owner() const { return owner_; }
 
+  inline Zone* zone();
+
   // We want to be able to assert, in a context-specific way, that the stack
   // height makes sense when the context is filled.
 #ifdef DEBUG
   int original_length_;
 #endif
 
  private:
   HGraphBuilder* owner_;
   Expression::Context kind_;
   AstContext* outer_;
@@ skipping 148 matching lines @@
     BreakAndContinueScope* next_;
   };
 
   HGraphBuilder(CompilationInfo* info, TypeFeedbackOracle* oracle)
       : function_state_(NULL),
         initial_function_state_(this, info, oracle),
         ast_context_(NULL),
         break_scope_(NULL),
         graph_(NULL),
         current_block_(NULL),
-        inlined_count_(0) {
+        inlined_count_(0),
+        zone_(info->isolate()->zone()) {
     // This is not initialized in the initializer list because the
     // constructor for the initial state relies on function_state_ == NULL
     // to know it's the initial state.
     function_state_= &initial_function_state_;
   }
 
   HGraph* CreateGraph();
 
   // Simple accessors.
   HGraph* graph() const { return graph_; }
@@ skipping 223 matching lines @@
       HValue* val,
       Assignment* expr);
 
   HValue* BuildContextChainWalk(Variable* var);
 
   void AddCheckConstantFunction(Call* expr,
                                 HValue* receiver,
                                 Handle<Map> receiver_map,
                                 bool smi_and_map_check);
 
+  Zone* zone() { return zone_; }
 
   // The translation state of the currently-being-translated function.
   FunctionState* function_state_;
 
   // The base of the function state stack.
   FunctionState initial_function_state_;
 
   // Expression context of the currently visited subexpression. NULL when
   // visiting statements.
   AstContext* ast_context_;
 
   // A stack of breakable statements entered.
   BreakAndContinueScope* break_scope_;
 
   HGraph* graph_;
   HBasicBlock* current_block_;
 
   int inlined_count_;
 
+  Zone* zone_;
+
   friend class FunctionState;  // Pushes and pops the state stack.
   friend class AstContext;  // Pushes and pops the AST context stack.
 
   DISALLOW_COPY_AND_ASSIGN(HGraphBuilder);
 };
 
 
+Zone* AstContext::zone() { return owner_->zone(); }
+
+
 class HValueMap: public ZoneObject {
  public:
   HValueMap()
       : array_size_(0),
         lists_size_(0),
         count_(0),
         present_flags_(0),
         array_(NULL),
         lists_(NULL),
         free_list_head_(kNil) {
     ResizeLists(kInitialSize);
     Resize(kInitialSize);
   }
 
   void Kill(int flags);
 
   void Add(HValue* value) {
     present_flags_ |= value->flags();
     Insert(value);
   }
 
   HValue* Lookup(HValue* value) const;
-  HValueMap* Copy() const { return new HValueMap(this); }
+
+  HValueMap* Copy(Zone* zone) const {
+    return new(zone) HValueMap(this);
+  }
 
  private:
   // A linked list of HValue* values.  Stored in arrays.
   struct HValueMapListElement {
     HValue* value;
     int next;  // Index in the array of the next list element.
   };
   static const int kNil = -1;  // The end of a linked list
 
   // Must be a power of 2.
@@ skipping 174 matching lines @@
   const char* filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_