Merged r16393 into 3.20 branch.

src/hydrogen-instructions.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 31 matching lines @@
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations.
 class HBasicBlock;
 class HEnvironment;
 class HInferRepresentationPhase;
 class HInstruction;
 class HLoopInformation;
+class HStoreNamedField;
 class HValue;
 class LInstruction;
 class LChunkBuilder;
 
-
 #define HYDROGEN_ABSTRACT_INSTRUCTION_LIST(V)  \
   V(ArithmeticBinaryOperation)                 \
   V(BinaryOperation)                           \
   V(BitwiseBinaryOperation)                    \
   V(ControlInstruction)                        \
   V(Instruction)                               \
 
 
 #define HYDROGEN_CONCRETE_INSTRUCTION_LIST(V)  \
   V(AccessArgumentsAt)                         \
@@ skipping 3130 matching lines @@
   DECLARE_CONCRETE_INSTRUCTION(CapturedObject)
 };
 
 
 class HConstant: public HTemplateInstruction<0> {
  public:
   DECLARE_INSTRUCTION_FACTORY_P1(HConstant, int32_t);
   DECLARE_INSTRUCTION_FACTORY_P2(HConstant, int32_t, Representation);
   DECLARE_INSTRUCTION_FACTORY_P1(HConstant, double);
   DECLARE_INSTRUCTION_FACTORY_P1(HConstant, Handle<Object>);
+  DECLARE_INSTRUCTION_FACTORY_P2(HConstant, Handle<Map>, UniqueValueId);
   DECLARE_INSTRUCTION_FACTORY_P1(HConstant, ExternalReference);
 
+  static HConstant* CreateAndInsertAfter(Zone* zone,
+                                         HValue* context,
+                                         int32_t value,
+                                         HInstruction* instruction) {
+    HConstant* new_constant = HConstant::New(zone, context, value);
+    new_constant->InsertAfter(instruction);
+    return new_constant;
+  }
+
+  static HConstant* CreateAndInsertBefore(Zone* zone,
+                                          HValue* context,
+                                          int32_t value,
+                                          HInstruction* instruction) {
+    HConstant* new_constant = HConstant::New(zone, context, value);
+    new_constant->InsertBefore(instruction);
+    return new_constant;
+  }
+
   Handle<Object> handle() {
     if (handle_.is_null()) {
       Factory* factory = Isolate::Current()->factory();
       // Default arguments to is_not_in_new_space depend on this heap number
       // to be tenured so that it's guaranteed not be be located in new space.
       handle_ = factory->NewNumber(double_value_, TENURED);
     }
     AllowDeferredHandleDereference smi_check;
     ASSERT(has_int32_value_ || !handle_->IsSmi());
     return handle_;
@@ skipping 182 matching lines @@
             bool is_not_in_new_space = true,
             Handle<Object> optional_handle = Handle<Object>::null());
   HConstant(Handle<Object> handle,
             UniqueValueId unique_id,
             Representation r,
             HType type,
             bool is_internalized_string,
             bool is_not_in_new_space,
             bool is_cell,
             bool boolean_value);
+  HConstant(Handle<Map> handle,
+            UniqueValueId unique_id);
   explicit HConstant(ExternalReference reference);
 
   void Initialize(Representation r);
 
   virtual bool IsDeletable() const { return true; }
 
   // If this is a numerical constant, handle_ either points to to the
   // HeapObject the constant originated from or is null.  If the
   // constant is non-numeric, handle_ always points to a valid
   // constant HeapObject.
@@ skipping 1670 matching lines @@
     ALLOCATE_IN_OLD_POINTER_SPACE = 1 << 2,
     ALLOCATE_DOUBLE_ALIGNED = 1 << 3,
     PREFILL_WITH_FILLER = 1 << 4
   };
 
   HAllocate(HValue* context,
             HValue* size,
             HType type,
             PretenureFlag pretenure_flag,
             InstanceType instance_type)
-      : HTemplateInstruction<2>(type) {
+      : HTemplateInstruction<2>(type),
+        dominating_allocate_(NULL),
+        filler_free_space_size_(NULL),
+        clear_next_map_word_(false) {
     SetOperandAt(0, context);
     SetOperandAt(1, size);
     set_representation(Representation::Tagged());
     SetFlag(kTrackSideEffectDominators);
     SetGVNFlag(kChangesNewSpacePromotion);
     SetGVNFlag(kDependsOnNewSpacePromotion);
     flags_ = pretenure_flag == TENURED
         ? (Heap::TargetSpaceId(instance_type) == OLD_POINTER_SPACE
             ? ALLOCATE_IN_OLD_POINTER_SPACE : ALLOCATE_IN_OLD_DATA_SPACE)
         : ALLOCATE_IN_NEW_SPACE;
     if (instance_type == FIXED_DOUBLE_ARRAY_TYPE) {
-      flags_ = static_cast<HAllocate::Flags>(flags_ |
-          ALLOCATE_DOUBLE_ALIGNED);
+      flags_ = static_cast<HAllocate::Flags>(flags_ | ALLOCATE_DOUBLE_ALIGNED);
     }
+    // We have to fill the allocated object with one word fillers if we do
+    // not use allocation folding since some allocations may depend on each
+    // other, i.e., have a pointer to each other. A GC in between these
+    // allocations may leave such objects behind in a not completely initialized
+    // state.
+    if (!FLAG_use_gvn || !FLAG_use_allocation_folding) {
+      flags_ = static_cast<HAllocate::Flags>(flags_ | PREFILL_WITH_FILLER);
+    }
+    clear_next_map_word_ = pretenure_flag == NOT_TENURED &&
+        AllocationSite::CanTrack(instance_type);
   }
 
+  HAllocate* GetFoldableDominator(HAllocate* dominator);
+
+  void UpdateFreeSpaceFiller(int32_t filler_size);
+
+  void CreateFreeSpaceFiller(int32_t filler_size);
+
+  bool IsFoldable(HAllocate* allocate) {
+    return (IsNewSpaceAllocation() && allocate->IsNewSpaceAllocation()) ||
+        (IsOldDataSpaceAllocation() && allocate->IsOldDataSpaceAllocation()) ||
+        (IsOldPointerSpaceAllocation() &&
+            allocate->IsOldPointerSpaceAllocation());
+  }
+
+  void ClearNextMapWord(int offset);
+
   Flags flags_;
   Handle<Map> known_initial_map_;
+  HAllocate* dominating_allocate_;
+  HStoreNamedField* filler_free_space_size_;
+  bool clear_next_map_word_;
 };
 
 
 class HInnerAllocatedObject: public HTemplateInstruction<1> {
  public:
   static HInnerAllocatedObject* New(Zone* zone,
                                     HValue* context,
                                     HValue* value,
                                     int offset,
                                     HType type = HType::Tagged()) {
@@ skipping 836 matching lines @@
 
   bool NeedsWriteBarrierForMap() {
     if (IsSkipWriteBarrier()) return false;
     return ReceiverObjectNeedsWriteBarrier(object(), new_space_dominator());
   }
 
   Representation field_representation() const {
     return access_.representation();
   }
 
+  void UpdateValue(HValue* value) {
+    SetOperandAt(1, value);
+  }
+
  private:
   HStoreNamedField(HValue* obj,
                    HObjectAccess access,
                    HValue* val)
       : access_(access),
         new_space_dominator_(NULL),
         write_barrier_mode_(UPDATE_WRITE_BARRIER),
         has_transition_(false) {
     SetOperandAt(0, obj);
     SetOperandAt(1, val);
@@ skipping 792 matching lines @@
   virtual bool IsDeletable() const { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_