Merge 6095:6198 from bleeding_edge to experimental/gc.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
===================================================================
--- src/hydrogen-instructions.h	(revision 6170)
+++ src/hydrogen-instructions.h	(working copy)
@@ -76,7 +76,6 @@
 //       HLoadKeyed
 //         HLoadKeyedFastElement
 //         HLoadKeyedGeneric
-//       HLoadNamedGeneric
 //       HPower
 //       HStoreNamed
 //         HStoreNamedField
@@ -119,7 +118,6 @@
 //       HStoreKeyedFastElement
 //       HStoreKeyedGeneric
 //     HUnaryOperation
-//       HArrayLength
 //       HBitNot
 //       HChange
 //       HCheckFunction
@@ -129,9 +127,13 @@
 //       HCheckPrototypeMaps
 //       HCheckSmi
 //       HDeleteProperty
+//       HFixedArrayLength
+//       HJSArrayLength
 //       HLoadElements
 //         HTypeofIs
 //       HLoadNamedField
+//       HLoadNamedGeneric
+//       HLoadFunctionPrototype
 //       HPushArgument
 //       HTypeof
 //       HUnaryMathOperation
@@ -170,7 +172,6 @@
   V(ArgumentsElements)                         \
   V(ArgumentsLength)                           \
   V(ArgumentsObject)                           \
-  V(ArrayLength)                               \
   V(ArrayLiteral)                              \
   V(BitAnd)                                    \
   V(BitNot)                                    \
@@ -203,6 +204,7 @@
   V(Deoptimize)                                \
   V(Div)                                       \
   V(EnterInlined)                              \
+  V(FixedArrayLength)                          \
   V(FunctionLiteral)                           \
   V(GlobalObject)                              \
   V(GlobalReceiver)                            \
@@ -213,6 +215,7 @@
   V(IsSmi)                                     \
   V(HasInstanceType)                           \
   V(HasCachedArrayIndex)                       \
+  V(JSArrayLength)                             \
   V(ClassOfTest)                               \
   V(LeaveInlined)                              \
   V(LoadElements)                              \
@@ -221,6 +224,7 @@
   V(LoadKeyedGeneric)                          \
   V(LoadNamedField)                            \
   V(LoadNamedGeneric)                          \
+  V(LoadFunctionPrototype)                     \
   V(Mod)                                       \
   V(Mul)                                       \
   V(ObjectLiteral)                             \
@@ -256,6 +260,7 @@
   V(GlobalVars)                                \
   V(Maps)                                      \
   V(ArrayLengths)                              \
+  V(FunctionPrototypes)                        \
   V(OsrEntries)
 
 #define DECLARE_INSTRUCTION(type)                   \
@@ -905,6 +910,9 @@
   virtual HBasicBlock* FirstSuccessor() const { return true_destination_; }
   virtual HBasicBlock* SecondSuccessor() const { return false_destination_; }
 
+  HBasicBlock* true_destination() const { return true_destination_; }
+  HBasicBlock* false_destination() const { return false_destination_; }
+
   virtual void PrintDataTo(StringStream* stream) const;
 
   Handle<Map> map() const { return map_; }
@@ -1015,10 +1023,10 @@
 
 class HSimulate: public HInstruction {
  public:
-  HSimulate(int ast_id, int pop_count, int environment_height)
+  HSimulate(int ast_id, int pop_count, int environment_length)
       : ast_id_(ast_id),
         pop_count_(pop_count),
-        environment_height_(environment_height),
+        environment_length_(environment_length),
         values_(2),
         assigned_indexes_(2) {}
   virtual ~HSimulate() {}
@@ -1032,7 +1040,7 @@
     ast_id_ = id;
   }
 
-  int environment_height() const { return environment_height_; }
+  int environment_length() const { return environment_length_; }
   int pop_count() const { return pop_count_; }
   const ZoneList<HValue*>* values() const { return &values_; }
   int GetAssignedIndexAt(int index) const {
@@ -1074,7 +1082,7 @@
   }
   int ast_id_;
   int pop_count_;
-  int environment_height_;
+  int environment_length_;
   ZoneList<HValue*> values_;
   ZoneList<int> assigned_indexes_;
 };
@@ -1336,9 +1344,9 @@
 };
 
 
-class HArrayLength: public HUnaryOperation {
+class HJSArrayLength: public HUnaryOperation {
  public:
-  explicit HArrayLength(HValue* value) : HUnaryOperation(value) {
+  explicit HJSArrayLength(HValue* value) : HUnaryOperation(value) {
     // The length of an array is stored as a tagged value in the array
     // object. It is guaranteed to be 32 bit integer, but it can be
     // represented as either a smi or heap number.
@@ -1351,10 +1359,26 @@
     return Representation::Tagged();
   }
 
-  DECLARE_CONCRETE_INSTRUCTION(ArrayLength, "array_length")
+  DECLARE_CONCRETE_INSTRUCTION(JSArrayLength, "js_array_length")
 };
 
 
+class HFixedArrayLength: public HUnaryOperation {
+ public:
+  explicit HFixedArrayLength(HValue* value) : HUnaryOperation(value) {
+    set_representation(Representation::Tagged());
+    SetFlag(kDependsOnArrayLengths);
+    SetFlag(kUseGVN);
+  }
+
+  virtual Representation RequiredInputRepresentation(int index) const {
+    return Representation::Tagged();
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(FixedArrayLength, "fixed_array_length")
+};
+
+
 class HBitNot: public HUnaryOperation {
  public:
   explicit HBitNot(HValue* value) : HUnaryOperation(value) {
@@ -1766,6 +1790,8 @@
 
   Handle<Object> handle() const { return handle_; }
 
+  bool InOldSpace() const { return !Heap::InNewSpace(*handle_); }
+
   virtual bool EmitAtUses() const { return !representation().IsDouble(); }
   virtual void PrintDataTo(StringStream* stream) const;
   virtual HType CalculateInferredType() const;
@@ -2617,6 +2643,27 @@
 };
 
 
+class HLoadFunctionPrototype: public HUnaryOperation {
+ public:
+  explicit HLoadFunctionPrototype(HValue* function)
+      : HUnaryOperation(function) {
+    set_representation(Representation::Tagged());
+    SetFlagMask(kDependsOnFunctionPrototypes);
+  }
+
+  HValue* function() const { return OperandAt(0); }
+
+  virtual Representation RequiredInputRepresentation(int index) const {
+    return Representation::Tagged();
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(LoadFunctionPrototype, "load_function_prototype")
+
+ protected:
+  virtual bool DataEquals(HValue* other) const { return true; }
+};
+
+
 class HLoadKeyed: public HBinaryOperation {
  public:
   HLoadKeyed(HValue* obj, HValue* key) : HBinaryOperation(obj, key) {
@@ -2663,6 +2710,12 @@
 };
 
 
+static inline bool StoringValueNeedsWriteBarrier(HValue* value) {
+  return !value->type().IsSmi() &&
+      !(value->IsConstant() && HConstant::cast(value)->InOldSpace());
+}
+
+
 class HStoreNamed: public HBinaryOperation {
  public:
   HStoreNamed(HValue* obj, Handle<Object> name, HValue* val)
@@ -2680,6 +2733,10 @@
   HValue* value() const { return OperandAt(1); }
   void set_value(HValue* value) { SetOperandAt(1, value); }
 
+  bool NeedsWriteBarrier() const {
+    return StoringValueNeedsWriteBarrier(value());
+  }
+
   DECLARE_INSTRUCTION(StoreNamed)
 
  protected:
@@ -2760,6 +2817,10 @@
   HValue* key() const { return OperandAt(1); }
   HValue* value() const { return OperandAt(2); }
 
+  bool NeedsWriteBarrier() const {
+    return StoringValueNeedsWriteBarrier(value());
+  }
+
   DECLARE_INSTRUCTION(StoreKeyed)
 
  protected:
@@ -2779,10 +2840,6 @@
     SetFlag(kChangesArrayElements);
   }
 
-  bool NeedsWriteBarrier() const {
-    return !value()->type().IsSmi();
-  }
-
   virtual Representation RequiredInputRepresentation(int index) const {
     // The key is supposed to be Integer32.
     return (index == 1) ? Representation::Integer32()