Merge 6168:6800 from bleeding_edge to experimental/gc branch.

src/ia32/lithium-ia32.h

-// Copyright 2010 the V8 project authors. All rights reserved.
+// 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
 //       with the distribution.
@@ skipping 11 matching lines @@
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #ifndef V8_IA32_LITHIUM_IA32_H_
 #define V8_IA32_LITHIUM_IA32_H_
 
 #include "hydrogen.h"
 #include "lithium-allocator.h"
+#include "lithium.h"
 #include "safepoint-table.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations.
 class LCodeGen;
-class LEnvironment;
-class Translation;
-class LGapNode;
-
-
-// Type hierarchy:
-//
-// LInstruction
-//   LAccessArgumentsAt
-//   LArgumentsElements
-//   LArgumentsLength
-//   LBinaryOperation
-//     LAddI
-//     LApplyArguments
-//     LArithmeticD
-//     LArithmeticT
-//     LBitI
-//     LBoundsCheck
-//     LCmpID
-//     LCmpIDAndBranch
-//     LCmpJSObjectEq
-//     LCmpJSObjectEqAndBranch
-//     LCmpT
-//     LDivI
-//     LInstanceOf
-//     LInstanceOfAndBranch
-//     LLoadKeyedFastElement
-//     LLoadKeyedGeneric
-//     LModI
-//     LMulI
-//     LPower
-//     LShiftI
-//     LSubI
-//   LCallConstantFunction
-//   LCallFunction
-//   LCallGlobal
-//   LCallKeyed
-//   LCallKnownGlobal
-//   LCallNamed
-//   LCallRuntime
-//   LCallStub
-//   LConstant
-//     LConstantD
-//     LConstantI
-//     LConstantT
-//   LDeoptimize
-//   LFunctionLiteral
-//   LGlobalObject
-//   LGlobalReceiver
-//   LLabel
-//   LLayzBailout
-//   LLoadGlobal
-//   LMaterializedLiteral
-//     LArrayLiteral
-//     LObjectLiteral
-//     LRegExpLiteral
-//   LOsrEntry
-//   LParameter
-//   LRegExpConstructResult
-//   LStackCheck
-//   LStoreKeyed
-//     LStoreKeyedFastElement
-//     LStoreKeyedGeneric
-//   LStoreNamed
-//     LStoreNamedField
-//     LStoreNamedGeneric
-//   LUnaryOperation
-//     LBitNotI
-//     LBranch
-//     LCallNew
-//     LCheckFunction
-//     LCheckInstanceType
-//     LCheckMap
-//     LCheckPrototypeMaps
-//     LCheckSmi
-//     LClassOfTest
-//     LClassOfTestAndBranch
-//     LDeleteProperty
-//     LDoubleToI
-//     LFixedArrayLength
-//     LHasCachedArrayIndex
-//     LHasCachedArrayIndexAndBranch
-//     LHasInstanceType
-//     LHasInstanceTypeAndBranch
-//     LInteger32ToDouble
-//     LIsNull
-//     LIsNullAndBranch
-//     LIsObject
-//     LIsObjectAndBranch
-//     LIsSmi
-//     LIsSmiAndBranch
-//     LJSArrayLength
-//     LLoadNamedField
-//     LLoadNamedGeneric
-//     LLoadFunctionPrototype
-//     LNumberTagD
-//     LNumberTagI
-//     LPushArgument
-//     LReturn
-//     LSmiTag
-//     LStoreGlobal
-//     LTaggedToI
-//     LThrow
-//     LTypeof
-//     LTypeofIs
-//     LTypeofIsAndBranch
-//     LUnaryMathOperation
-//     LValueOf
-//   LUnknownOSRValue
 
 #define LITHIUM_ALL_INSTRUCTION_LIST(V)         \
-  V(BinaryOperation)                            \
-  V(Constant)                                   \
+  V(ControlInstruction)                         \
   V(Call)                                       \
-  V(MaterializedLiteral)                        \
   V(StoreKeyed)                                 \
   V(StoreNamed)                                 \
-  V(UnaryOperation)                             \
   LITHIUM_CONCRETE_INSTRUCTION_LIST(V)
 
 
 #define LITHIUM_CONCRETE_INSTRUCTION_LIST(V)    \
   V(AccessArgumentsAt)                          \
   V(AddI)                                       \
   V(ApplyArguments)                             \
   V(ArgumentsElements)                          \
   V(ArgumentsLength)                            \
   V(ArithmeticD)                                \
@@ skipping 10 matching lines @@
   V(CallKnownGlobal)                            \
   V(CallNamed)                                  \
   V(CallNew)                                    \
   V(CallRuntime)                                \
   V(CallStub)                                   \
   V(CheckFunction)                              \
   V(CheckInstanceType)                          \
   V(CheckMap)                                   \
   V(CheckPrototypeMaps)                         \
   V(CheckSmi)                                   \
+  V(ClassOfTest)                                \
+  V(ClassOfTestAndBranch)                       \
   V(CmpID)                                      \
   V(CmpIDAndBranch)                             \
   V(CmpJSObjectEq)                              \
   V(CmpJSObjectEqAndBranch)                     \
   V(CmpMapAndBranch)                            \
   V(CmpT)                                       \
   V(CmpTAndBranch)                              \
   V(ConstantD)                                  \
   V(ConstantI)                                  \
   V(ConstantT)                                  \
+  V(Context)                                    \
   V(DeleteProperty)                             \
   V(Deoptimize)                                 \
   V(DivI)                                       \
   V(DoubleToI)                                  \
+  V(FixedArrayLength)                           \
   V(FunctionLiteral)                            \
   V(Gap)                                        \
   V(GlobalObject)                               \
   V(GlobalReceiver)                             \
   V(Goto)                                       \
-  V(FixedArrayLength)                           \
+  V(HasCachedArrayIndex)                        \
+  V(HasCachedArrayIndexAndBranch)               \
+  V(HasInstanceType)                            \
+  V(HasInstanceTypeAndBranch)                   \
   V(InstanceOf)                                 \
   V(InstanceOfAndBranch)                        \
+  V(InstanceOfKnownGlobal)                      \
   V(Integer32ToDouble)                          \
   V(IsNull)                                     \
   V(IsNullAndBranch)                            \
   V(IsObject)                                   \
   V(IsObjectAndBranch)                          \
   V(IsSmi)                                      \
   V(IsSmiAndBranch)                             \
+  V(IsConstructCall)                            \
+  V(IsConstructCallAndBranch)                   \
   V(JSArrayLength)                              \
-  V(HasInstanceType)                            \
-  V(HasInstanceTypeAndBranch)                   \
-  V(HasCachedArrayIndex)                        \
-  V(HasCachedArrayIndexAndBranch)               \
-  V(ClassOfTest)                                \
-  V(ClassOfTestAndBranch)                       \
   V(Label)                                      \
   V(LazyBailout)                                \
+  V(LoadContextSlot)                            \
   V(LoadElements)                               \
+  V(LoadFunctionPrototype)                      \
   V(LoadGlobal)                                 \
   V(LoadKeyedFastElement)                       \
   V(LoadKeyedGeneric)                           \
   V(LoadNamedField)                             \
   V(LoadNamedGeneric)                           \
-  V(LoadFunctionPrototype)                      \
+  V(LoadPixelArrayElement)                      \
+  V(LoadPixelArrayExternalPointer)              \
   V(ModI)                                       \
   V(MulI)                                       \
   V(NumberTagD)                                 \
   V(NumberTagI)                                 \
   V(NumberUntagD)                               \
   V(ObjectLiteral)                              \
   V(OsrEntry)                                   \
+  V(OuterContext)                               \
   V(Parameter)                                  \
+  V(PixelArrayLength)                           \
   V(Power)                                      \
   V(PushArgument)                               \
   V(RegExpLiteral)                              \
   V(Return)                                     \
   V(ShiftI)                                     \
   V(SmiTag)                                     \
   V(SmiUntag)                                   \
   V(StackCheck)                                 \
+  V(StoreContextSlot)                           \
   V(StoreGlobal)                                \
   V(StoreKeyedFastElement)                      \
   V(StoreKeyedGeneric)                          \
   V(StoreNamedField)                            \
   V(StoreNamedGeneric)                          \
+  V(StringCharCodeAt)                           \
+  V(StringLength)                               \
   V(SubI)                                       \
   V(TaggedToI)                                  \
   V(Throw)                                      \
   V(Typeof)                                     \
   V(TypeofIs)                                   \
   V(TypeofIsAndBranch)                          \
   V(UnaryMathOperation)                         \
   V(UnknownOSRValue)                            \
   V(ValueOf)
 
@@ skipping 14 matching lines @@
 
 #define DECLARE_HYDROGEN_ACCESSOR(type)     \
   H##type* hydrogen() const {               \
     return H##type::cast(hydrogen_value()); \
   }
 
 
 class LInstruction: public ZoneObject {
  public:
   LInstruction()
-      : hydrogen_value_(NULL) { }
+      : environment_(NULL),
+        hydrogen_value_(NULL),
+        is_call_(false),
+        is_save_doubles_(false) { }
   virtual ~LInstruction() { }
 
   virtual void CompileToNative(LCodeGen* generator) = 0;
   virtual const char* Mnemonic() const = 0;
-  virtual void PrintTo(StringStream* stream) const;
-  virtual void PrintDataTo(StringStream* stream) const { }
+  virtual void PrintTo(StringStream* stream);
+  virtual void PrintDataTo(StringStream* stream) = 0;
+  virtual void PrintOutputOperandTo(StringStream* stream) = 0;
 
   // Declare virtual type testers.
 #define DECLARE_DO(type) virtual bool Is##type() const { return false; }
   LITHIUM_ALL_INSTRUCTION_LIST(DECLARE_DO)
 #undef DECLARE_DO
+
   virtual bool IsControl() const { return false; }
+  virtual void SetBranchTargets(int true_block_id, int false_block_id) { }
 
-  void set_environment(LEnvironment* env) { environment_.set(env); }
-  LEnvironment* environment() const { return environment_.get(); }
-  bool HasEnvironment() const { return environment_.is_set(); }
+  void set_environment(LEnvironment* env) { environment_ = env; }
+  LEnvironment* environment() const { return environment_; }
+  bool HasEnvironment() const { return environment_ != NULL; }
 
   void set_pointer_map(LPointerMap* p) { pointer_map_.set(p); }
   LPointerMap* pointer_map() const { return pointer_map_.get(); }
   bool HasPointerMap() const { return pointer_map_.is_set(); }
 
-  void set_result(LOperand* operand) { result_.set(operand); }
-  LOperand* result() const { return result_.get(); }
-  bool HasResult() const { return result_.is_set(); }
 
   void set_hydrogen_value(HValue* value) { hydrogen_value_ = value; }
   HValue* hydrogen_value() const { return hydrogen_value_; }
 
   void set_deoptimization_environment(LEnvironment* env) {
     deoptimization_environment_.set(env);
   }
   LEnvironment* deoptimization_environment() const {
     return deoptimization_environment_.get();
   }
   bool HasDeoptimizationEnvironment() const {
     return deoptimization_environment_.is_set();
   }
 
+  void MarkAsCall() { is_call_ = true; }
+  void MarkAsSaveDoubles() { is_save_doubles_ = true; }
+
+  // Interface to the register allocator and iterators.
+  bool IsMarkedAsCall() const { return is_call_; }
+  bool IsMarkedAsSaveDoubles() const { return is_save_doubles_; }
+
+  virtual bool HasResult() const = 0;
+  virtual LOperand* result() = 0;
+
+  virtual int InputCount() = 0;
+  virtual LOperand* InputAt(int i) = 0;
+  virtual int TempCount() = 0;
+  virtual LOperand* TempAt(int i) = 0;
+
+  LOperand* FirstInput() { return InputAt(0); }
+  LOperand* Output() { return HasResult() ? result() : NULL; }
+
+#ifdef DEBUG
+  void VerifyCall();
+#endif
+
  private:
-  SetOncePointer<LEnvironment> environment_;
+  LEnvironment* environment_;
   SetOncePointer<LPointerMap> pointer_map_;
-  SetOncePointer<LOperand> result_;
   HValue* hydrogen_value_;
   SetOncePointer<LEnvironment> deoptimization_environment_;
+  bool is_call_;
+  bool is_save_doubles_;
 };
 
 
-class LGapResolver BASE_EMBEDDED {
+template<typename ElementType, int NumElements>
+class OperandContainer {
  public:
-  LGapResolver(const ZoneList<LMoveOperands>* moves, LOperand* marker_operand);
-  const ZoneList<LMoveOperands>* ResolveInReverseOrder();
+  OperandContainer() {
+    for (int i = 0; i < NumElements; i++) elems_[i] = NULL;
+  }
+  int length() { return NumElements; }
+  ElementType& operator[](int i) {
+    ASSERT(i < length());
+    return elems_[i];
+  }
+  void PrintOperandsTo(StringStream* stream);
 
  private:
-  LGapNode* LookupNode(LOperand* operand);
-  bool CanReach(LGapNode* a, LGapNode* b, int visited_id);
-  bool CanReach(LGapNode* a, LGapNode* b);
-  void RegisterMove(LMoveOperands move);
-  void AddResultMove(LOperand* from, LOperand* to);
-  void AddResultMove(LGapNode* from, LGapNode* to);
-  void ResolveCycle(LGapNode* start);
-
-  ZoneList<LGapNode*> nodes_;
-  ZoneList<LGapNode*> identified_cycles_;
-  ZoneList<LMoveOperands> result_;
-  LOperand* marker_operand_;
-  int next_visited_id_;
-  int bailout_after_ast_id_;
+  ElementType elems_[NumElements];
 };
 
 
-class LParallelMove : public ZoneObject {
+template<typename ElementType>
+class OperandContainer<ElementType, 0> {
  public:
-  LParallelMove() : move_operands_(4) { }
-
-  void AddMove(LOperand* from, LOperand* to) {
-    move_operands_.Add(LMoveOperands(from, to));
+  int length() { return 0; }
+  void PrintOperandsTo(StringStream* stream) { }
+  ElementType& operator[](int i) {
+    UNREACHABLE();
+    static ElementType t = 0;
+    return t;
   }
-
-  bool IsRedundant() const;
-
-  const ZoneList<LMoveOperands>* move_operands() const {
-    return &move_operands_;
-  }
-
-  void PrintDataTo(StringStream* stream) const;
-
- private:
-  ZoneList<LMoveOperands> move_operands_;
 };
 
 
-class LGap: public LInstruction {
+// R = number of result operands (0 or 1).
+// I = number of input operands.
+// T = number of temporary operands.
+template<int R, int I, int T>
+class LTemplateInstruction: public LInstruction {
+ public:
+  // Allow 0 or 1 output operands.
+  STATIC_ASSERT(R == 0 || R == 1);
+  virtual bool HasResult() const { return R != 0; }
+  void set_result(LOperand* operand) { results_[0] = operand; }
+  LOperand* result() { return results_[0]; }
+
+  int InputCount() { return I; }
+  LOperand* InputAt(int i) { return inputs_[i]; }
+
+  int TempCount() { return T; }
+  LOperand* TempAt(int i) { return temps_[i]; }
+
+  virtual void PrintDataTo(StringStream* stream);
+  virtual void PrintOutputOperandTo(StringStream* stream);
+
+ protected:
+  OperandContainer<LOperand*, R> results_;
+  OperandContainer<LOperand*, I> inputs_;
+  OperandContainer<LOperand*, T> temps_;
+};
+
+
+class LGap: public LTemplateInstruction<0, 0, 0> {
  public:
   explicit LGap(HBasicBlock* block)
       : block_(block) {
     parallel_moves_[BEFORE] = NULL;
     parallel_moves_[START] = NULL;
     parallel_moves_[END] = NULL;
     parallel_moves_[AFTER] = NULL;
   }
 
   DECLARE_CONCRETE_INSTRUCTION(Gap, "gap")
-  virtual void PrintDataTo(StringStream* stream) const;
+  virtual void PrintDataTo(StringStream* stream);
 
   bool IsRedundant() const;
 
   HBasicBlock* block() const { return block_; }
 
   enum InnerPosition {
     BEFORE,
     START,
     END,
     AFTER,
     FIRST_INNER_POSITION = BEFORE,
     LAST_INNER_POSITION = AFTER
   };
 
   LParallelMove* GetOrCreateParallelMove(InnerPosition pos)  {
     if (parallel_moves_[pos] == NULL) parallel_moves_[pos] = new LParallelMove;
     return parallel_moves_[pos];
   }
 
   LParallelMove* GetParallelMove(InnerPosition pos)  {
     return parallel_moves_[pos];
   }
 
  private:
   LParallelMove* parallel_moves_[LAST_INNER_POSITION + 1];
   HBasicBlock* block_;
 };
 
 
-class LGoto: public LInstruction {
+class LGoto: public LTemplateInstruction<0, 0, 0> {
  public:
   LGoto(int block_id, bool include_stack_check = false)
     : block_id_(block_id), include_stack_check_(include_stack_check) { }
 
   DECLARE_CONCRETE_INSTRUCTION(Goto, "goto")
-  virtual void PrintDataTo(StringStream* stream) const;
+  virtual void PrintDataTo(StringStream* stream);
   virtual bool IsControl() const { return true; }
 
   int block_id() const { return block_id_; }
   bool include_stack_check() const { return include_stack_check_; }
 
  private:
   int block_id_;
   bool include_stack_check_;
 };
 
 
-class LLazyBailout: public LInstruction {
+class LLazyBailout: public LTemplateInstruction<0, 0, 0> {
  public:
   LLazyBailout() : gap_instructions_size_(0) { }
 
   DECLARE_CONCRETE_INSTRUCTION(LazyBailout, "lazy-bailout")
 
   void set_gap_instructions_size(int gap_instructions_size) {
     gap_instructions_size_ = gap_instructions_size;
   }
   int gap_instructions_size() { return gap_instructions_size_; }
 
  private:
   int gap_instructions_size_;
 };
 
 
-class LDeoptimize: public LInstruction {
+class LDeoptimize: public LTemplateInstruction<0, 0, 0> {
  public:
   DECLARE_CONCRETE_INSTRUCTION(Deoptimize, "deoptimize")
 };
 
 
 class LLabel: public LGap {
  public:
   explicit LLabel(HBasicBlock* block)
       : LGap(block), replacement_(NULL) { }
 
   DECLARE_CONCRETE_INSTRUCTION(Label, "label")
 
-  virtual void PrintDataTo(StringStream* stream) const;
+  virtual void PrintDataTo(StringStream* stream);
 
   int block_id() const { return block()->block_id(); }
   bool is_loop_header() const { return block()->IsLoopHeader(); }
   Label* label() { return &label_; }
   LLabel* replacement() const { return replacement_; }
   void set_replacement(LLabel* label) { replacement_ = label; }
   bool HasReplacement() const { return replacement_ != NULL; }
 
  private:
   Label label_;
   LLabel* replacement_;
 };
 
 
-class LParameter: public LInstruction {
+class LParameter: public LTemplateInstruction<1, 0, 0> {
  public:
   DECLARE_CONCRETE_INSTRUCTION(Parameter, "parameter")
 };
 
 
-class LCallStub: public LInstruction {
+class LCallStub: public LTemplateInstruction<1, 1, 0> {
  public:
+  explicit LCallStub(LOperand* context) {
+    inputs_[0] = context;
+  }
+
   DECLARE_CONCRETE_INSTRUCTION(CallStub, "call-stub")
   DECLARE_HYDROGEN_ACCESSOR(CallStub)
 
+  LOperand* context() { return inputs_[0]; }
+
   TranscendentalCache::Type transcendental_type() {
     return hydrogen()->transcendental_type();
   }
 };
 
 
-class LUnknownOSRValue: public LInstruction {
+class LUnknownOSRValue: public LTemplateInstruction<1, 0, 0> {
  public:
   DECLARE_CONCRETE_INSTRUCTION(UnknownOSRValue, "unknown-osr-value")
 };
 
 
-class LUnaryOperation: public LInstruction {
+template<int I, int T>
+class LControlInstruction: public LTemplateInstruction<0, I, T> {
  public:
-  explicit LUnaryOperation(LOperand* input) : input_(input) { }
+  DECLARE_INSTRUCTION(ControlInstruction)
+  virtual bool IsControl() const { return true; }
 
-  DECLARE_INSTRUCTION(UnaryOperation)
-
-  LOperand* input() const { return input_; }
-
-  virtual void PrintDataTo(StringStream* stream) const;
+  int true_block_id() const { return true_block_id_; }
+  int false_block_id() const { return false_block_id_; }
+  void SetBranchTargets(int true_block_id, int false_block_id) {
+    true_block_id_ = true_block_id;
+    false_block_id_ = false_block_id;
+  }
 
  private:
-  LOperand* input_;
+  int true_block_id_;
+  int false_block_id_;
 };
 
 
-class LBinaryOperation: public LInstruction {
- public:
-  LBinaryOperation(LOperand* left, LOperand* right)
-      : left_(left), right_(right) { }
-
-  DECLARE_INSTRUCTION(BinaryOperation)
-
-  LOperand* left() const { return left_; }
-  LOperand* right() const { return right_; }
-  virtual void PrintDataTo(StringStream* stream) const;
-
- private:
-  LOperand* left_;
-  LOperand* right_;
-};
-
-
-class LApplyArguments: public LBinaryOperation {
+class LApplyArguments: public LTemplateInstruction<1, 4, 1> {
  public:
   LApplyArguments(LOperand* function,
                   LOperand* receiver,
                   LOperand* length,
-                  LOperand* elements)
-      : LBinaryOperation(function, receiver),
-        length_(length),
-        elements_(elements) { }
+                  LOperand* elements,
+                  LOperand* temp) {
+    inputs_[0] = function;
+    inputs_[1] = receiver;
+    inputs_[2] = length;
+    inputs_[3] = elements;
+    temps_[0] = temp;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(ApplyArguments, "apply-arguments")
 
-  LOperand* function() const { return left(); }
-  LOperand* receiver() const { return right(); }
-  LOperand* length() const { return length_; }
-  LOperand* elements() const { return elements_; }
-
- private:
-  LOperand* length_;
-  LOperand* elements_;
+  LOperand* function() { return inputs_[0]; }
+  LOperand* receiver() { return inputs_[1]; }
+  LOperand* length() { return inputs_[2]; }
+  LOperand* elements() { return inputs_[3]; }
 };
 
 
-class LAccessArgumentsAt: public LInstruction {
+class LAccessArgumentsAt: public LTemplateInstruction<1, 3, 0> {
  public:
-  LAccessArgumentsAt(LOperand* arguments, LOperand* length, LOperand* index)
-      : arguments_(arguments), length_(length), index_(index) { }
+  LAccessArgumentsAt(LOperand* arguments, LOperand* length, LOperand* index) {
+    inputs_[0] = arguments;
+    inputs_[1] = length;
+    inputs_[2] = index;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(AccessArgumentsAt, "access-arguments-at")
 
-  LOperand* arguments() const { return arguments_; }
-  LOperand* length() const { return length_; }
-  LOperand* index() const { return index_; }
+  LOperand* arguments() { return inputs_[0]; }
+  LOperand* length() { return inputs_[1]; }
+  LOperand* index() { return inputs_[2]; }
 
-  virtual void PrintDataTo(StringStream* stream) const;
-
- private:
-  LOperand* arguments_;
-  LOperand* length_;
-  LOperand* index_;
+  virtual void PrintDataTo(StringStream* stream);
 };
 
 
-class LArgumentsLength: public LUnaryOperation {
+class LArgumentsLength: public LTemplateInstruction<1, 1, 0> {
  public:
-  explicit LArgumentsLength(LOperand* elements) : LUnaryOperation(elements) {}
+  explicit LArgumentsLength(LOperand* elements) {
+    inputs_[0] = elements;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(ArgumentsLength, "arguments-length")
 };
 
 
-class LArgumentsElements: public LInstruction {
+class LArgumentsElements: public LTemplateInstruction<1, 0, 0> {
  public:
   LArgumentsElements() { }
 
   DECLARE_CONCRETE_INSTRUCTION(ArgumentsElements, "arguments-elements")
 };
 
 
-class LModI: public LBinaryOperation {
- public:
-  LModI(LOperand* left, LOperand* right) : LBinaryOperation(left, right) { }
+class LModI: public LTemplateInstruction<1, 2, 1> {
+ public:
+  LModI(LOperand* left, LOperand* right, LOperand* temp) {
+    inputs_[0] = left;
+    inputs_[1] = right;
+    temps_[0] = temp;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(ModI, "mod-i")
   DECLARE_HYDROGEN_ACCESSOR(Mod)
 };
 
 
-class LDivI: public LBinaryOperation {
- public:
-  LDivI(LOperand* left, LOperand* right)
-      : LBinaryOperation(left, right) { }
+class LDivI: public LTemplateInstruction<1, 2, 1> {
+ public:
+  LDivI(LOperand* left, LOperand* right, LOperand* temp) {
+    inputs_[0] = left;
+    inputs_[1] = right;
+    temps_[0] = temp;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(DivI, "div-i")
   DECLARE_HYDROGEN_ACCESSOR(Div)
 };
 
 
-class LMulI: public LBinaryOperation {
- public:
-  LMulI(LOperand* left, LOperand* right, LOperand* temp)
-      : LBinaryOperation(left, right), temp_(temp) { }
+class LMulI: public LTemplateInstruction<1, 2, 1> {
+ public:
+  LMulI(LOperand* left, LOperand* right, LOperand* temp) {
+    inputs_[0] = left;
+    inputs_[1] = right;
+    temps_[0] = temp;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(MulI, "mul-i")
   DECLARE_HYDROGEN_ACCESSOR(Mul)
-
-  LOperand* temp() const { return temp_; }
-
- private:
-  LOperand* temp_;
-};
-
-
-class LCmpID: public LBinaryOperation {
- public:
-  LCmpID(Token::Value op, LOperand* left, LOperand* right, bool is_double)
-      : LBinaryOperation(left, right), op_(op), is_double_(is_double) { }
-
-  Token::Value op() const { return op_; }
-  bool is_double() const { return is_double_; }
+};
+
+
+class LCmpID: public LTemplateInstruction<1, 2, 0> {
+ public:
+  LCmpID(LOperand* left, LOperand* right) {
+    inputs_[0] = left;
+    inputs_[1] = right;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(CmpID, "cmp-id")
-
- private:
-  Token::Value op_;
-  bool is_double_;
-};
-
-
-class LCmpIDAndBranch: public LCmpID {
- public:
-  LCmpIDAndBranch(Token::Value op,
-                  LOperand* left,
-                  LOperand* right,
-                  int true_block_id,
-                  int false_block_id,
-                  bool is_double)
-      : LCmpID(op, left, right, is_double),
-        true_block_id_(true_block_id),
-        false_block_id_(false_block_id) { }
+  DECLARE_HYDROGEN_ACCESSOR(Compare)
+
+  Token::Value op() const { return hydrogen()->token(); }
+  bool is_double() const {
+    return hydrogen()->GetInputRepresentation().IsDouble();
+  }
+};
+
+
+class LCmpIDAndBranch: public LControlInstruction<2, 0> {
+ public:
+  LCmpIDAndBranch(LOperand* left, LOperand* right) {
+    inputs_[0] = left;
+    inputs_[1] = right;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(CmpIDAndBranch, "cmp-id-and-branch")
-  virtual void PrintDataTo(StringStream* stream) const;
-  virtual bool IsControl() const { return true; }
-
-  int true_block_id() const { return true_block_id_; }
-  int false_block_id() const { return false_block_id_; }
-
- private:
-  int true_block_id_;
-  int false_block_id_;
-};
-
-
-class LUnaryMathOperation: public LUnaryOperation {
- public:
-  explicit LUnaryMathOperation(LOperand* value)
-      : LUnaryOperation(value) { }
+  DECLARE_HYDROGEN_ACCESSOR(Compare)
+
+  Token::Value op() const { return hydrogen()->token(); }
+  bool is_double() const {
+    return hydrogen()->GetInputRepresentation().IsDouble();
+  }
+
+  virtual void PrintDataTo(StringStream* stream);
+};
+
+
+class LUnaryMathOperation: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LUnaryMathOperation(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(UnaryMathOperation, "unary-math-operation")
   DECLARE_HYDROGEN_ACCESSOR(UnaryMathOperation)
 
-  virtual void PrintDataTo(StringStream* stream) const;
+  virtual void PrintDataTo(StringStream* stream);
   BuiltinFunctionId op() const { return hydrogen()->op(); }
 };
 
 
-class LCmpJSObjectEq: public LBinaryOperation {
- public:
-  LCmpJSObjectEq(LOperand* left, LOperand* right)
-      : LBinaryOperation(left, right) {}
+class LCmpJSObjectEq: public LTemplateInstruction<1, 2, 0> {
+ public:
+  LCmpJSObjectEq(LOperand* left, LOperand* right) {
+    inputs_[0] = left;
+    inputs_[1] = right;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(CmpJSObjectEq, "cmp-jsobject-eq")
 };
 
 
-class LCmpJSObjectEqAndBranch: public LCmpJSObjectEq {
- public:
-  LCmpJSObjectEqAndBranch(LOperand* left,
-                          LOperand* right,
-                          int true_block_id,
-                          int false_block_id)
-      : LCmpJSObjectEq(left, right),
-        true_block_id_(true_block_id),
-        false_block_id_(false_block_id) { }
+class LCmpJSObjectEqAndBranch: public LControlInstruction<2, 0> {
+ public:
+  LCmpJSObjectEqAndBranch(LOperand* left, LOperand* right) {
+    inputs_[0] = left;
+    inputs_[1] = right;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(CmpJSObjectEqAndBranch,
                                "cmp-jsobject-eq-and-branch")
-
-  int true_block_id() const { return true_block_id_; }
-  int false_block_id() const { return false_block_id_; }
-
- private:
-  int true_block_id_;
-  int false_block_id_;
-};
-
-
-class LIsNull: public LUnaryOperation {
- public:
-  LIsNull(LOperand* value, bool is_strict)
-      : LUnaryOperation(value), is_strict_(is_strict) {}
+};
+
+
+class LIsNull: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LIsNull(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(IsNull, "is-null")
-
-  bool is_strict() const { return is_strict_; }
-
- private:
-  bool is_strict_;
-};
-
-
-class LIsNullAndBranch: public LIsNull {
- public:
-  LIsNullAndBranch(LOperand* value,
-                   bool is_strict,
-                   LOperand* temp,
-                   int true_block_id,
-                   int false_block_id)
-      : LIsNull(value, is_strict),
-        temp_(temp),
-        true_block_id_(true_block_id),
-        false_block_id_(false_block_id) { }
+  DECLARE_HYDROGEN_ACCESSOR(IsNull)
+
+  bool is_strict() const { return hydrogen()->is_strict(); }
+};
+
+
+class LIsNullAndBranch: public LControlInstruction<1, 1> {
+ public:
+  LIsNullAndBranch(LOperand* value, LOperand* temp) {
+    inputs_[0] = value;
+    temps_[0] = temp;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(IsNullAndBranch, "is-null-and-branch")
-  virtual void PrintDataTo(StringStream* stream) const;
-  virtual bool IsControl() const { return true; }
-
-  int true_block_id() const { return true_block_id_; }
-  int false_block_id() const { return false_block_id_; }
-
-  LOperand* temp() const { return temp_; }
-
- private:
-  LOperand* temp_;
-  int true_block_id_;
-  int false_block_id_;
-};
-
-
-class LIsObject: public LUnaryOperation {
- public:
-  LIsObject(LOperand* value, LOperand* temp)
-      : LUnaryOperation(value), temp_(temp) {}
+  DECLARE_HYDROGEN_ACCESSOR(IsNull)
+
+  bool is_strict() const { return hydrogen()->is_strict(); }
+
+  virtual void PrintDataTo(StringStream* stream);
+};
+
+
+class LIsObject: public LTemplateInstruction<1, 1, 1> {
+ public:
+  LIsObject(LOperand* value, LOperand* temp) {
+    inputs_[0] = value;
+    temps_[0] = temp;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(IsObject, "is-object")
-
-  LOperand* temp() const { return temp_; }
-
- private:
-  LOperand* temp_;
-};
-
-
-class LIsObjectAndBranch: public LIsObject {
- public:
-  LIsObjectAndBranch(LOperand* value,
-                     LOperand* temp,
-                     LOperand* temp2,
-                     int true_block_id,
-                     int false_block_id)
-      : LIsObject(value, temp),
-        temp2_(temp2),
-        true_block_id_(true_block_id),
-        false_block_id_(false_block_id) { }
+};
+
+
+class LIsObjectAndBranch: public LControlInstruction<1, 2> {
+ public:
+  LIsObjectAndBranch(LOperand* value, LOperand* temp, LOperand* temp2) {
+    inputs_[0] = value;
+    temps_[0] = temp;
+    temps_[1] = temp2;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(IsObjectAndBranch, "is-object-and-branch")
-  virtual void PrintDataTo(StringStream* stream) const;
-  virtual bool IsControl() const { return true; }
-
-  int true_block_id() const { return true_block_id_; }
-  int false_block_id() const { return false_block_id_; }
-
-  LOperand* temp2() const { return temp2_; }
-
- private:
-  LOperand* temp2_;
-  int true_block_id_;
-  int false_block_id_;
-};
-
-
-class LIsSmi: public LUnaryOperation {
- public:
-  explicit LIsSmi(LOperand* value) : LUnaryOperation(value) {}
+
+  virtual void PrintDataTo(StringStream* stream);
+};
+
+
+class LIsSmi: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LIsSmi(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(IsSmi, "is-smi")
   DECLARE_HYDROGEN_ACCESSOR(IsSmi)
 };
 
 
-class LIsSmiAndBranch: public LIsSmi {
- public:
-  LIsSmiAndBranch(LOperand* value,
-                  int true_block_id,
-                  int false_block_id)
-      : LIsSmi(value),
-        true_block_id_(true_block_id),
-        false_block_id_(false_block_id) { }
+class LIsSmiAndBranch: public LControlInstruction<1, 0> {
+ public:
+  explicit LIsSmiAndBranch(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(IsSmiAndBranch, "is-smi-and-branch")
-  virtual void PrintDataTo(StringStream* stream) const;
-  virtual bool IsControl() const { return true; }
-
-  int true_block_id() const { return true_block_id_; }
-  int false_block_id() const { return false_block_id_; }
-
- private:
-  int true_block_id_;
-  int false_block_id_;
-};
-
-
-class LHasInstanceType: public LUnaryOperation {
- public:
-  explicit LHasInstanceType(LOperand* value)
-      : LUnaryOperation(value) { }
+
+  virtual void PrintDataTo(StringStream* stream);
+};
+
+
+class LHasInstanceType: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LHasInstanceType(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(HasInstanceType, "has-instance-type")
   DECLARE_HYDROGEN_ACCESSOR(HasInstanceType)
-
-  InstanceType TestType();  // The type to test against when generating code.
-  Condition BranchCondition();  // The branch condition for 'true'.
-};
-
-
-class LHasInstanceTypeAndBranch: public LHasInstanceType {
- public:
-  LHasInstanceTypeAndBranch(LOperand* value,
-                            LOperand* temporary,
-                            int true_block_id,
-                            int false_block_id)
-      : LHasInstanceType(value),
-        temp_(temporary),
-        true_block_id_(true_block_id),
-        false_block_id_(false_block_id) { }
+};
+
+
+class LHasInstanceTypeAndBranch: public LControlInstruction<1, 1> {
+ public:
+  LHasInstanceTypeAndBranch(LOperand* value, LOperand* temp) {
+    inputs_[0] = value;
+    temps_[0] = temp;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(HasInstanceTypeAndBranch,
                                "has-instance-type-and-branch")
-  virtual void PrintDataTo(StringStream* stream) const;
-  virtual bool IsControl() const { return true; }
-
-  int true_block_id() const { return true_block_id_; }
-  int false_block_id() const { return false_block_id_; }
-
-  LOperand* temp() { return temp_; }
-
- private:
-  LOperand* temp_;
-  int true_block_id_;
-  int false_block_id_;
-};
-
-
-class LHasCachedArrayIndex: public LUnaryOperation {
- public:
-  explicit LHasCachedArrayIndex(LOperand* value) : LUnaryOperation(value) {}
+  DECLARE_HYDROGEN_ACCESSOR(HasInstanceType)
+
+  virtual void PrintDataTo(StringStream* stream);
+};
+
+
+class LHasCachedArrayIndex: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LHasCachedArrayIndex(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(HasCachedArrayIndex, "has-cached-array-index")
   DECLARE_HYDROGEN_ACCESSOR(HasCachedArrayIndex)
 };
 
 
-class LHasCachedArrayIndexAndBranch: public LHasCachedArrayIndex {
- public:
-  LHasCachedArrayIndexAndBranch(LOperand* value,
-                                int true_block_id,
-                                int false_block_id)
-      : LHasCachedArrayIndex(value),
-        true_block_id_(true_block_id),
-        false_block_id_(false_block_id) { }
+class LHasCachedArrayIndexAndBranch: public LControlInstruction<1, 0> {
+ public:
+  explicit LHasCachedArrayIndexAndBranch(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(HasCachedArrayIndexAndBranch,
                                "has-cached-array-index-and-branch")
-  virtual void PrintDataTo(StringStream* stream) const;
-  virtual bool IsControl() const { return true; }
-
-  int true_block_id() const { return true_block_id_; }
-  int false_block_id() const { return false_block_id_; }
-
- private:
-  int true_block_id_;
-  int false_block_id_;
-};
-
-
-class LClassOfTest: public LUnaryOperation {
- public:
-  LClassOfTest(LOperand* value, LOperand* temp)
-      : LUnaryOperation(value), temporary_(temp) {}
+  virtual void PrintDataTo(StringStream* stream);
+};
+
+
+class LIsConstructCall: public LTemplateInstruction<1, 0, 0> {
+ public:
+  DECLARE_CONCRETE_INSTRUCTION(IsConstructCall, "is-construct-call")
+  DECLARE_HYDROGEN_ACCESSOR(IsConstructCall)
+};
+
+
+class LIsConstructCallAndBranch: public LControlInstruction<0, 1> {
+ public:
+  explicit LIsConstructCallAndBranch(LOperand* temp) {
+    temps_[0] = temp;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(IsConstructCallAndBranch,
+                               "is-construct-call-and-branch")
+};
+
+
+class LClassOfTest: public LTemplateInstruction<1, 1, 1> {
+ public:
+  LClassOfTest(LOperand* value, LOperand* temp) {
+    inputs_[0] = value;
+    temps_[0] = temp;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(ClassOfTest, "class-of-test")
   DECLARE_HYDROGEN_ACCESSOR(ClassOfTest)
 
-  virtual void PrintDataTo(StringStream* stream) const;
-
-  LOperand* temporary() { return temporary_; }
-
- private:
-  LOperand *temporary_;
-};
-
-
-class LClassOfTestAndBranch: public LClassOfTest {
- public:
-  LClassOfTestAndBranch(LOperand* value,
-                        LOperand* temporary,
-                        LOperand* temporary2,
-                        int true_block_id,
-                        int false_block_id)
-      : LClassOfTest(value, temporary),
-        temporary2_(temporary2),
-        true_block_id_(true_block_id),
-        false_block_id_(false_block_id) { }
+  virtual void PrintDataTo(StringStream* stream);
+};
+
+
+class LClassOfTestAndBranch: public LControlInstruction<1, 2> {
+ public:
+  LClassOfTestAndBranch(LOperand* value, LOperand* temp, LOperand* temp2) {
+    inputs_[0] = value;
+    temps_[0] = temp;
+    temps_[1] = temp2;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(ClassOfTestAndBranch,
                                "class-of-test-and-branch")
-  virtual void PrintDataTo(StringStream* stream) const;
-  virtual bool IsControl() const { return true; }
-
-  int true_block_id() const { return true_block_id_; }
-  int false_block_id() const { return false_block_id_; }
-  LOperand* temporary2() { return temporary2_; }
-
- private:
-  LOperand* temporary2_;
-  int true_block_id_;
-  int false_block_id_;
-};
-
-
-class LCmpT: public LBinaryOperation {
- public:
-  LCmpT(LOperand* left, LOperand* right) : LBinaryOperation(left, right) {}
+  DECLARE_HYDROGEN_ACCESSOR(ClassOfTest)
+
+  virtual void PrintDataTo(StringStream* stream);
+};
+
+
+class LCmpT: public LTemplateInstruction<1, 2, 0> {
+ public:
+  LCmpT(LOperand* left, LOperand* right) {
+    inputs_[0] = left;
+    inputs_[1] = right;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(CmpT, "cmp-t")
   DECLARE_HYDROGEN_ACCESSOR(Compare)
 
   Token::Value op() const { return hydrogen()->token(); }
 };
 
 
-class LCmpTAndBranch: public LCmpT {
+class LCmpTAndBranch: public LControlInstruction<2, 0> {
  public:
-  LCmpTAndBranch(LOperand* left,
-                 LOperand* right,
-                 int true_block_id,
-                 int false_block_id)
-      : LCmpT(left, right),
-        true_block_id_(true_block_id),
-        false_block_id_(false_block_id) { }
+  LCmpTAndBranch(LOperand* left, LOperand* right) {
+    inputs_[0] = left;
+    inputs_[1] = right;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(CmpTAndBranch, "cmp-t-and-branch")
+  DECLARE_HYDROGEN_ACCESSOR(Compare)
 
-  int true_block_id() const { return true_block_id_; }
-  int false_block_id() const { return false_block_id_; }
-
- private:
-  int true_block_id_;
-  int false_block_id_;
+  Token::Value op() const { return hydrogen()->token(); }
 };
 
 
-class LInstanceOf: public LBinaryOperation {
+class LInstanceOf: public LTemplateInstruction<1, 3, 0> {
  public:
-  LInstanceOf(LOperand* left, LOperand* right)
-      : LBinaryOperation(left, right) { }
+  LInstanceOf(LOperand* context, LOperand* left, LOperand* right) {
+    inputs_[0] = context;
+    inputs_[1] = left;
+    inputs_[2] = right;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(InstanceOf, "instance-of")
+
+  LOperand* context() { return inputs_[0]; }
 };
 
 
-class LInstanceOfAndBranch: public LInstanceOf {
+class LInstanceOfAndBranch: public LControlInstruction<3, 0> {
  public:
-  LInstanceOfAndBranch(LOperand* left,
-                       LOperand* right,
-                       int true_block_id,
-                       int false_block_id)
-      : LInstanceOf(left, right),
-        true_block_id_(true_block_id),
-        false_block_id_(false_block_id) { }
+  LInstanceOfAndBranch(LOperand* context, LOperand* left, LOperand* right) {
+    inputs_[0] = context;
+    inputs_[1] = left;
+    inputs_[2] = right;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(InstanceOfAndBranch, "instance-of-and-branch")
 
-  int true_block_id() const { return true_block_id_; }
-  int false_block_id() const { return false_block_id_; }
-
- private:
-  int true_block_id_;
-  int false_block_id_;
+  LOperand* context() { return inputs_[0]; }
 };
 
 
-class LBoundsCheck: public LBinaryOperation {
+class LInstanceOfKnownGlobal: public LTemplateInstruction<1, 1, 1> {
  public:
-  LBoundsCheck(LOperand* index, LOperand* length)
-      : LBinaryOperation(index, length) { }
+  LInstanceOfKnownGlobal(LOperand* value, LOperand* temp) {
+    inputs_[0] = value;
+    temps_[0] = temp;
+  }
 
-  LOperand* index() const { return left(); }
-  LOperand* length() const { return right(); }
+  DECLARE_CONCRETE_INSTRUCTION(InstanceOfKnownGlobal,
+                               "instance-of-known-global")
+  DECLARE_HYDROGEN_ACCESSOR(InstanceOfKnownGlobal)
+
+  Handle<JSFunction> function() const { return hydrogen()->function(); }
+};
+
+
+class LBoundsCheck: public LTemplateInstruction<0, 2, 0> {
+ public:
+  LBoundsCheck(LOperand* index, LOperand* length) {
+    inputs_[0] = index;
+    inputs_[1] = length;
+  }
+
+  LOperand* index() { return inputs_[0]; }
+  LOperand* length() { return inputs_[1]; }
 
   DECLARE_CONCRETE_INSTRUCTION(BoundsCheck, "bounds-check")
 };
 
 
-class LBitI: public LBinaryOperation {
+class LBitI: public LTemplateInstruction<1, 2, 0> {
  public:
   LBitI(Token::Value op, LOperand* left, LOperand* right)
-      : LBinaryOperation(left, right), op_(op) { }
+      : op_(op) {
+    inputs_[0] = left;
+    inputs_[1] = right;
+  }
 
   Token::Value op() const { return op_; }
 
   DECLARE_CONCRETE_INSTRUCTION(BitI, "bit-i")
 
  private:
   Token::Value op_;
 };
 
 
-class LShiftI: public LBinaryOperation {
+class LShiftI: public LTemplateInstruction<1, 2, 0> {
  public:
   LShiftI(Token::Value op, LOperand* left, LOperand* right, bool can_deopt)
-      : LBinaryOperation(left, right), op_(op), can_deopt_(can_deopt) { }
+      : op_(op), can_deopt_(can_deopt) {
+    inputs_[0] = left;
+    inputs_[1] = right;
+  }
 
   Token::Value op() const { return op_; }
 
   bool can_deopt() const { return can_deopt_; }
 
   DECLARE_CONCRETE_INSTRUCTION(ShiftI, "shift-i")
 
  private:
   Token::Value op_;
   bool can_deopt_;
 };
 
 
-class LSubI: public LBinaryOperation {
+class LSubI: public LTemplateInstruction<1, 2, 0> {
  public:
-  LSubI(LOperand* left, LOperand* right)
-      : LBinaryOperation(left, right) { }
+  LSubI(LOperand* left, LOperand* right) {
+    inputs_[0] = left;
+    inputs_[1] = right;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(SubI, "sub-i")
   DECLARE_HYDROGEN_ACCESSOR(Sub)
 };
 
 
-class LConstant: public LInstruction {
-  DECLARE_INSTRUCTION(Constant)
+class LConstantI: public LTemplateInstruction<1, 0, 0> {
+ public:
+  DECLARE_CONCRETE_INSTRUCTION(ConstantI, "constant-i")
+  DECLARE_HYDROGEN_ACCESSOR(Constant)
+
+  int32_t value() const { return hydrogen()->Integer32Value(); }
 };
 
 
-class LConstantI: public LConstant {
+class LConstantD: public LTemplateInstruction<1, 0, 1> {
  public:
-  explicit LConstantI(int32_t value) : value_(value) { }
-  int32_t value() const { return value_; }
+  explicit LConstantD(LOperand* temp) {
+    temps_[0] = temp;
+  }
 
-  DECLARE_CONCRETE_INSTRUCTION(ConstantI, "constant-i")
+  DECLARE_CONCRETE_INSTRUCTION(ConstantD, "constant-d")
+  DECLARE_HYDROGEN_ACCESSOR(Constant)
 
- private:
-  int32_t value_;
+  double value() const { return hydrogen()->DoubleValue(); }
 };
 
 
-class LConstantD: public LConstant {
+class LConstantT: public LTemplateInstruction<1, 0, 0> {
  public:
-  explicit LConstantD(double value) : value_(value) { }
-  double value() const { return value_; }
+  DECLARE_CONCRETE_INSTRUCTION(ConstantT, "constant-t")
+  DECLARE_HYDROGEN_ACCESSOR(Constant)
 
-  DECLARE_CONCRETE_INSTRUCTION(ConstantD, "constant-d")
-
- private:
-  double value_;
+  Handle<Object> value() const { return hydrogen()->handle(); }
 };
 
 
-class LConstantT: public LConstant {
+class LBranch: public LControlInstruction<1, 0> {
  public:
-  explicit LConstantT(Handle<Object> value) : value_(value) { }
-  Handle<Object> value() const { return value_; }
-
-  DECLARE_CONCRETE_INSTRUCTION(ConstantT, "constant-t")
-
- private:
-  Handle<Object> value_;
-};
-
-
-class LBranch: public LUnaryOperation {
- public:
-  LBranch(LOperand* input, int true_block_id, int false_block_id)
-      : LUnaryOperation(input),
-        true_block_id_(true_block_id),
-        false_block_id_(false_block_id) { }
+  explicit LBranch(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(Branch, "branch")
   DECLARE_HYDROGEN_ACCESSOR(Value)
 
-  virtual void PrintDataTo(StringStream* stream) const;
-  virtual bool IsControl() const { return true; }
-
-  int true_block_id() const { return true_block_id_; }
-  int false_block_id() const { return false_block_id_; }
-
- private:
-  int true_block_id_;
-  int false_block_id_;
+  virtual void PrintDataTo(StringStream* stream);
 };
 
 
-class LCmpMapAndBranch: public LUnaryOperation {
+class LCmpMapAndBranch: public LTemplateInstruction<0, 1, 0> {
  public:
-  LCmpMapAndBranch(LOperand* value,
-                   Handle<Map> map,
-                   int true_block_id,
-                   int false_block_id)
-      : LUnaryOperation(value),
-        map_(map),
-        true_block_id_(true_block_id),
-        false_block_id_(false_block_id) { }
+  explicit LCmpMapAndBranch(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(CmpMapAndBranch, "cmp-map-and-branch")
+  DECLARE_HYDROGEN_ACCESSOR(CompareMap)
 
   virtual bool IsControl() const { return true; }
 
-  Handle<Map> map() const { return map_; }
-  int true_block_id() const { return true_block_id_; }
-  int false_block_id() const { return false_block_id_; }
-
- private:
-  Handle<Map> map_;
-  int true_block_id_;
-  int false_block_id_;
+  Handle<Map> map() const { return hydrogen()->map(); }
+  int true_block_id() const {
+    return hydrogen()->FirstSuccessor()->block_id();
+  }
+  int false_block_id() const {
+    return hydrogen()->SecondSuccessor()->block_id();
+  }
 };
 
 
-class LJSArrayLength: public LUnaryOperation {
+class LJSArrayLength: public LTemplateInstruction<1, 1, 0> {
  public:
-  explicit LJSArrayLength(LOperand* input) : LUnaryOperation(input) { }
+  explicit LJSArrayLength(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(JSArrayLength, "js-array-length")
   DECLARE_HYDROGEN_ACCESSOR(JSArrayLength)
 };
 
 
-class LFixedArrayLength: public LUnaryOperation {
+class LPixelArrayLength: public LTemplateInstruction<1, 1, 0> {
  public:
-  explicit LFixedArrayLength(LOperand* input) : LUnaryOperation(input) { }
+  explicit LPixelArrayLength(LOperand* value) {
+    inputs_[0] = value;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(PixelArrayLength, "pixel-array-length")
+  DECLARE_HYDROGEN_ACCESSOR(PixelArrayLength)
+};
+
+
+class LFixedArrayLength: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LFixedArrayLength(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(FixedArrayLength, "fixed-array-length")
   DECLARE_HYDROGEN_ACCESSOR(FixedArrayLength)
 };
 
 
-class LValueOf: public LUnaryOperation {
+class LValueOf: public LTemplateInstruction<1, 1, 1> {
  public:
-  LValueOf(LOperand* input, LOperand* temporary)
-      : LUnaryOperation(input), temporary_(temporary) { }
-
-  LOperand* temporary() const { return temporary_; }
+  LValueOf(LOperand* value, LOperand* temp) {
+    inputs_[0] = value;
+    temps_[0] = temp;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(ValueOf, "value-of")
   DECLARE_HYDROGEN_ACCESSOR(ValueOf)
-
- private:
-  LOperand* temporary_;
 };
 
 
-class LThrow: public LUnaryOperation {
+class LThrow: public LTemplateInstruction<0, 1, 0> {
  public:
-  explicit LThrow(LOperand* value) : LUnaryOperation(value) { }
+  explicit LThrow(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(Throw, "throw")
 };
 
 
-class LBitNotI: public LUnaryOperation {
+class LBitNotI: public LTemplateInstruction<1, 1, 0> {
  public:
-  explicit LBitNotI(LOperand* use) : LUnaryOperation(use) { }
+  explicit LBitNotI(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(BitNotI, "bit-not-i")
 };
 
 
-class LAddI: public LBinaryOperation {
+class LAddI: public LTemplateInstruction<1, 2, 0> {
  public:
-  LAddI(LOperand* left, LOperand* right)
-      : LBinaryOperation(left, right) { }
+  LAddI(LOperand* left, LOperand* right) {
+    inputs_[0] = left;
+    inputs_[1] = right;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(AddI, "add-i")
   DECLARE_HYDROGEN_ACCESSOR(Add)
 };
 
 
-class LPower: public LBinaryOperation {
+class LPower: public LTemplateInstruction<1, 2, 0> {
  public:
-  LPower(LOperand* left, LOperand* right)
-      : LBinaryOperation(left, right) { }
+  LPower(LOperand* left, LOperand* right) {
+    inputs_[0] = left;
+    inputs_[1] = right;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(Power, "power")
   DECLARE_HYDROGEN_ACCESSOR(Power)
 };
 
 
-class LArithmeticD: public LBinaryOperation {
+class LArithmeticD: public LTemplateInstruction<1, 2, 0> {
  public:
   LArithmeticD(Token::Value op, LOperand* left, LOperand* right)
-      : LBinaryOperation(left, right), op_(op) { }
+      : op_(op) {
+    inputs_[0] = left;
+    inputs_[1] = right;
+  }
 
   Token::Value op() const { return op_; }
 
   virtual void CompileToNative(LCodeGen* generator);
   virtual const char* Mnemonic() const;
 
  private:
   Token::Value op_;
 };
 
 
-class LArithmeticT: public LBinaryOperation {
+class LArithmeticT: public LTemplateInstruction<1, 2, 0> {
  public:
   LArithmeticT(Token::Value op, LOperand* left, LOperand* right)
-      : LBinaryOperation(left, right), op_(op) { }
+      : op_(op) {
+    inputs_[0] = left;
+    inputs_[1] = right;
+  }
 
   virtual void CompileToNative(LCodeGen* generator);
   virtual const char* Mnemonic() const;
 
   Token::Value op() const { return op_; }
 
  private:
   Token::Value op_;
 };
 
 
-class LReturn: public LUnaryOperation {
- public:
-  explicit LReturn(LOperand* use) : LUnaryOperation(use) { }
+class LReturn: public LTemplateInstruction<0, 1, 0> {
+ public:
+  explicit LReturn(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(Return, "return")
 };
 
 
-class LLoadNamedField: public LUnaryOperation {
- public:
-  explicit LLoadNamedField(LOperand* object) : LUnaryOperation(object) { }
+class LLoadNamedField: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LLoadNamedField(LOperand* object) {
+    inputs_[0] = object;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(LoadNamedField, "load-named-field")
   DECLARE_HYDROGEN_ACCESSOR(LoadNamedField)
 };
 
 
-class LLoadNamedGeneric: public LUnaryOperation {
- public:
-  explicit LLoadNamedGeneric(LOperand* object) : LUnaryOperation(object) { }
+class LLoadNamedGeneric: public LTemplateInstruction<1, 2, 0> {
+ public:
+  LLoadNamedGeneric(LOperand* context, LOperand* object) {
+    inputs_[0] = context;
+    inputs_[1] = object;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(LoadNamedGeneric, "load-named-generic")
   DECLARE_HYDROGEN_ACCESSOR(LoadNamedGeneric)
 
-  LOperand* object() const { return input(); }
+  LOperand* context() { return inputs_[0]; }
+  LOperand* object() { return inputs_[1]; }
   Handle<Object> name() const { return hydrogen()->name(); }
 };
 
 
-class LLoadFunctionPrototype: public LUnaryOperation {
- public:
-  LLoadFunctionPrototype(LOperand* function, LOperand* temporary)
-      : LUnaryOperation(function), temporary_(temporary) { }
+class LLoadFunctionPrototype: public LTemplateInstruction<1, 1, 1> {
+ public:
+  LLoadFunctionPrototype(LOperand* function, LOperand* temp) {
+    inputs_[0] = function;
+    temps_[0] = temp;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(LoadFunctionPrototype, "load-function-prototype")
   DECLARE_HYDROGEN_ACCESSOR(LoadFunctionPrototype)
 
-  LOperand* function() const { return input(); }
-  LOperand* temporary() const { return temporary_; }
-
- private:
-  LOperand* temporary_;
-};
-
-
-class LLoadElements: public LUnaryOperation {
- public:
-  explicit LLoadElements(LOperand* obj) : LUnaryOperation(obj) { }
+  LOperand* function() { return inputs_[0]; }
+};
+
+
+class LLoadElements: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LLoadElements(LOperand* object) {
+    inputs_[0] = object;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(LoadElements, "load-elements")
 };
 
 
-class LLoadKeyedFastElement: public LBinaryOperation {
- public:
-  LLoadKeyedFastElement(LOperand* elements,
-                        LOperand* key,
-                        LOperand* load_result)
-      : LBinaryOperation(elements, key),
-        load_result_(load_result) { }
+class LLoadPixelArrayExternalPointer: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LLoadPixelArrayExternalPointer(LOperand* object) {
+    inputs_[0] = object;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(LoadPixelArrayExternalPointer,
+                               "load-pixel-array-external-pointer")
+};
+
+
+class LLoadKeyedFastElement: public LTemplateInstruction<1, 2, 0> {
+ public:
+  LLoadKeyedFastElement(LOperand* elements, LOperand* key) {
+    inputs_[0] = elements;
+    inputs_[1] = key;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(LoadKeyedFastElement, "load-keyed-fast-element")
   DECLARE_HYDROGEN_ACCESSOR(LoadKeyedFastElement)
 
-  LOperand* elements() const { return left(); }
-  LOperand* key() const { return right(); }
-  LOperand* load_result() const { return load_result_; }
-
- private:
-  LOperand* load_result_;
-};
-
-
-class LLoadKeyedGeneric: public LBinaryOperation {
- public:
-  LLoadKeyedGeneric(LOperand* obj, LOperand* key)
-      : LBinaryOperation(obj, key) { }
+  LOperand* elements() { return inputs_[0]; }
+  LOperand* key() { return inputs_[1]; }
+};
+
+
+class LLoadPixelArrayElement: public LTemplateInstruction<1, 2, 0> {
+ public:
+  LLoadPixelArrayElement(LOperand* external_pointer, LOperand* key) {
+    inputs_[0] = external_pointer;
+    inputs_[1] = key;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(LoadPixelArrayElement,
+                               "load-pixel-array-element")
+  DECLARE_HYDROGEN_ACCESSOR(LoadPixelArrayElement)
+
+  LOperand* external_pointer() { return inputs_[0]; }
+  LOperand* key() { return inputs_[1]; }
+};
+
+
+class LLoadKeyedGeneric: public LTemplateInstruction<1, 3, 0> {
+ public:
+  LLoadKeyedGeneric(LOperand* context, LOperand* obj, LOperand* key) {
+    inputs_[0] = context;
+    inputs_[1] = obj;
+    inputs_[2] = key;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(LoadKeyedGeneric, "load-keyed-generic")
 
-  LOperand* object() const { return left(); }
-  LOperand* key() const { return right(); }
-};
-
-
-class LLoadGlobal: public LInstruction {
+  LOperand* context() { return inputs_[0]; }
+  LOperand* object() { return inputs_[1]; }
+  LOperand* key() { return inputs_[2]; }
+};
+
+
+class LLoadGlobal: public LTemplateInstruction<1, 0, 0> {
  public:
   DECLARE_CONCRETE_INSTRUCTION(LoadGlobal, "load-global")
   DECLARE_HYDROGEN_ACCESSOR(LoadGlobal)
 };
 
 
-class LStoreGlobal: public LUnaryOperation {
- public:
-  explicit LStoreGlobal(LOperand* value) : LUnaryOperation(value) {}
+class LStoreGlobal: public LTemplateInstruction<0, 1, 0> {
+ public:
+  explicit LStoreGlobal(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(StoreGlobal, "store-global")
   DECLARE_HYDROGEN_ACCESSOR(StoreGlobal)
 };
 
 
-class LPushArgument: public LUnaryOperation {
- public:
-  explicit LPushArgument(LOperand* argument) : LUnaryOperation(argument) {}
+class LLoadContextSlot: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LLoadContextSlot(LOperand* context) {
+    inputs_[0] = context;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(LoadContextSlot, "load-context-slot")
+  DECLARE_HYDROGEN_ACCESSOR(LoadContextSlot)
+
+  LOperand* context() { return InputAt(0); }
+  int slot_index() { return hydrogen()->slot_index(); }
+
+  virtual void PrintDataTo(StringStream* stream);
+};
+
+
+class LStoreContextSlot: public LTemplateInstruction<0, 2, 1> {
+ public:
+  LStoreContextSlot(LOperand* context, LOperand* value, LOperand* temp) {
+    inputs_[0] = context;
+    inputs_[1] = value;
+    temps_[0] = temp;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(StoreContextSlot, "store-context-slot")
+  DECLARE_HYDROGEN_ACCESSOR(StoreContextSlot)
+
+  LOperand* context() { return InputAt(0); }
+  LOperand* value() { return InputAt(1); }
+  int slot_index() { return hydrogen()->slot_index(); }
+  int needs_write_barrier() { return hydrogen()->NeedsWriteBarrier(); }
+
+  virtual void PrintDataTo(StringStream* stream);
+};
+
+
+class LPushArgument: public LTemplateInstruction<0, 1, 0> {
+ public:
+  explicit LPushArgument(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(PushArgument, "push-argument")
 };
 
 
-class LGlobalObject: public LInstruction {
- public:
+class LContext: public LTemplateInstruction<1, 0, 0> {
+ public:
+  DECLARE_CONCRETE_INSTRUCTION(Context, "context")
+};
+
+
+class LOuterContext: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LOuterContext(LOperand* context) {
+    inputs_[0] = context;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(OuterContext, "outer-context")
+
+  LOperand* context() { return InputAt(0); }
+};
+
+
+class LGlobalObject: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LGlobalObject(LOperand* context) {
+    inputs_[0] = context;
+  }
+
   DECLARE_CONCRETE_INSTRUCTION(GlobalObject, "global-object")
-};
-
-
-class LGlobalReceiver: public LInstruction {
- public:
+
+  LOperand* context() { return InputAt(0); }
+};
+
+
+class LGlobalReceiver: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LGlobalReceiver(LOperand* global_object) {
+    inputs_[0] = global_object;
+  }
+
   DECLARE_CONCRETE_INSTRUCTION(GlobalReceiver, "global-receiver")
-};
-
-
-class LCallConstantFunction: public LInstruction {
+
+  LOperand* global() { return InputAt(0); }
+};
+
+
+class LCallConstantFunction: public LTemplateInstruction<1, 0, 0> {
  public:
   DECLARE_CONCRETE_INSTRUCTION(CallConstantFunction, "call-constant-function")
   DECLARE_HYDROGEN_ACCESSOR(CallConstantFunction)
 
-  virtual void PrintDataTo(StringStream* stream) const;
-
-  Handle<JSFunction> function() const { return hydrogen()->function(); }
-  int arity() const { return hydrogen()->argument_count() - 1; }
-};
-
-
-class LCallKeyed: public LInstruction {
- public:
+  virtual void PrintDataTo(StringStream* stream);
+
+  Handle<JSFunction> function() { return hydrogen()->function(); }
+  int arity() const { return hydrogen()->argument_count() - 1; }
+};
+
+
+class LCallKeyed: public LTemplateInstruction<1, 2, 0> {
+ public:
+  LCallKeyed(LOperand* context, LOperand* key) {
+    inputs_[0] = context;
+    inputs_[1] = key;
+  }
+
   DECLARE_CONCRETE_INSTRUCTION(CallKeyed, "call-keyed")
   DECLARE_HYDROGEN_ACCESSOR(CallKeyed)
 
-  virtual void PrintDataTo(StringStream* stream) const;
-
-  int arity() const { return hydrogen()->argument_count() - 1; }
-};
-
-
-class LCallNamed: public LInstruction {
- public:
+  LOperand* context() { return inputs_[0]; }
+  LOperand* key() { return inputs_[1]; }
+
+  virtual void PrintDataTo(StringStream* stream);
+
+  int arity() const { return hydrogen()->argument_count() - 1; }
+};
+
+
+class LCallNamed: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LCallNamed(LOperand* context) {
+    inputs_[0] = context;
+  }
+
   DECLARE_CONCRETE_INSTRUCTION(CallNamed, "call-named")
   DECLARE_HYDROGEN_ACCESSOR(CallNamed)
 
-  virtual void PrintDataTo(StringStream* stream) const;
-
+  virtual void PrintDataTo(StringStream* stream);
+
+  LOperand* context() { return inputs_[0]; }
   Handle<String> name() const { return hydrogen()->name(); }
   int arity() const { return hydrogen()->argument_count() - 1; }
 };
 
 
-class LCallFunction: public LInstruction {
- public:
+class LCallFunction: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LCallFunction(LOperand* context) {
+    inputs_[0] = context;
+  }
+
   DECLARE_CONCRETE_INSTRUCTION(CallFunction, "call-function")
   DECLARE_HYDROGEN_ACCESSOR(CallFunction)
 
+  LOperand* context() { return inputs_[0]; }
   int arity() const { return hydrogen()->argument_count() - 2; }
 };
 
 
-class LCallGlobal: public LInstruction {
- public:
+class LCallGlobal: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LCallGlobal(LOperand* context) {
+    inputs_[0] = context;
+  }
+
   DECLARE_CONCRETE_INSTRUCTION(CallGlobal, "call-global")
   DECLARE_HYDROGEN_ACCESSOR(CallGlobal)
 
-  virtual void PrintDataTo(StringStream* stream) const;
-
+  virtual void PrintDataTo(StringStream* stream);
+
+  LOperand* context() { return inputs_[0]; }
   Handle<String> name() const {return hydrogen()->name(); }
   int arity() const { return hydrogen()->argument_count() - 1; }
 };
 
 
-class LCallKnownGlobal: public LInstruction {
+class LCallKnownGlobal: public LTemplateInstruction<1, 0, 0> {
  public:
   DECLARE_CONCRETE_INSTRUCTION(CallKnownGlobal, "call-known-global")
   DECLARE_HYDROGEN_ACCESSOR(CallKnownGlobal)
 
-  virtual void PrintDataTo(StringStream* stream) const;
+  virtual void PrintDataTo(StringStream* stream);
 
   Handle<JSFunction> target() const { return hydrogen()->target();  }
   int arity() const { return hydrogen()->argument_count() - 1;  }
 };
 
 
-class LCallNew: public LUnaryOperation {
- public:
-  explicit LCallNew(LOperand* constructor) : LUnaryOperation(constructor) { }
+class LCallNew: public LTemplateInstruction<1, 2, 0> {
+ public:
+  LCallNew(LOperand* context, LOperand* constructor) {
+    inputs_[0] = context;
+    inputs_[1] = constructor;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(CallNew, "call-new")
   DECLARE_HYDROGEN_ACCESSOR(CallNew)
 
-  virtual void PrintDataTo(StringStream* stream) const;
-
-  int arity() const { return hydrogen()->argument_count() - 1; }
-};
-
-
-class LCallRuntime: public LInstruction {
+  virtual void PrintDataTo(StringStream* stream);
+
+  LOperand* context() { return inputs_[0]; }
+  LOperand* constructor() { return inputs_[1]; }
+  int arity() const { return hydrogen()->argument_count() - 1; }
+};
+
+
+class LCallRuntime: public LTemplateInstruction<1, 0, 0> {
  public:
   DECLARE_CONCRETE_INSTRUCTION(CallRuntime, "call-runtime")
   DECLARE_HYDROGEN_ACCESSOR(CallRuntime)
 
   Runtime::Function* function() const { return hydrogen()->function(); }
   int arity() const { return hydrogen()->argument_count(); }
 };
 
 
-class LInteger32ToDouble: public LUnaryOperation {
+class LInteger32ToDouble: public LTemplateInstruction<1, 1, 0> {
  public:
-  explicit LInteger32ToDouble(LOperand* use) : LUnaryOperation(use) { }
+  explicit LInteger32ToDouble(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(Integer32ToDouble, "int32-to-double")
 };
 
 
-class LNumberTagI: public LUnaryOperation {
+class LNumberTagI: public LTemplateInstruction<1, 1, 0> {
  public:
-  explicit LNumberTagI(LOperand* use) : LUnaryOperation(use) { }
+  explicit LNumberTagI(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(NumberTagI, "number-tag-i")
 };
 
 
-class LNumberTagD: public LUnaryOperation {
+class LNumberTagD: public LTemplateInstruction<1, 1, 1> {
  public:
-  explicit LNumberTagD(LOperand* value, LOperand* temp)
-      : LUnaryOperation(value), temp_(temp) { }
+  LNumberTagD(LOperand* value, LOperand* temp) {
+    inputs_[0] = value;
+    temps_[0] = temp;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(NumberTagD, "number-tag-d")
-
-  LOperand* temp() const { return temp_; }
-
- private:
-  LOperand* temp_;
 };
 
 
 // Sometimes truncating conversion from a tagged value to an int32.
-class LDoubleToI: public LUnaryOperation {
+class LDoubleToI: public LTemplateInstruction<1, 1, 1> {
  public:
-  explicit LDoubleToI(LOperand* value) : LUnaryOperation(value) { }
+  LDoubleToI(LOperand* value, LOperand* temp) {
+    inputs_[0] = value;
+    temps_[0] = temp;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(DoubleToI, "double-to-i")
   DECLARE_HYDROGEN_ACCESSOR(Change)
 
   bool truncating() { return hydrogen()->CanTruncateToInt32(); }
 };
 
 
 // Truncating conversion from a tagged value to an int32.
-class LTaggedToI: public LUnaryOperation {
+class LTaggedToI: public LTemplateInstruction<1, 1, 1> {
  public:
-  LTaggedToI(LOperand* value, LOperand* temp)
-      : LUnaryOperation(value), temp_(temp) { }
+  LTaggedToI(LOperand* value, LOperand* temp) {
+    inputs_[0] = value;
+    temps_[0] = temp;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(TaggedToI, "tagged-to-i")
   DECLARE_HYDROGEN_ACCESSOR(Change)
 
   bool truncating() { return hydrogen()->CanTruncateToInt32(); }
-  LOperand* temp() const { return temp_; }
-
- private:
-  LOperand* temp_;
 };
 
 
-class LSmiTag: public LUnaryOperation {
+class LSmiTag: public LTemplateInstruction<1, 1, 0> {
  public:
-  explicit LSmiTag(LOperand* use) : LUnaryOperation(use) { }
+  explicit LSmiTag(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(SmiTag, "smi-tag")
 };
 
 
-class LNumberUntagD: public LUnaryOperation {
+class LNumberUntagD: public LTemplateInstruction<1, 1, 0> {
  public:
-  explicit LNumberUntagD(LOperand* value) : LUnaryOperation(value) { }
+  explicit LNumberUntagD(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(NumberUntagD, "double-untag")
 };
 
 
-class LSmiUntag: public LUnaryOperation {
+class LSmiUntag: public LTemplateInstruction<1, 1, 0> {
  public:
-  LSmiUntag(LOperand* use, bool needs_check)
-      : LUnaryOperation(use), needs_check_(needs_check) { }
+  LSmiUntag(LOperand* value, bool needs_check)
+      : needs_check_(needs_check) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(SmiUntag, "smi-untag")
 
   bool needs_check() const { return needs_check_; }
 
  private:
   bool needs_check_;
 };
 
 
-class LStoreNamed: public LInstruction {
+class LStoreNamed: public LTemplateInstruction<0, 2, 1> {
  public:
-  LStoreNamed(LOperand* obj, Handle<Object> name, LOperand* val)
-      : object_(obj), name_(name), value_(val) { }
+  LStoreNamed(LOperand* obj, LOperand* val) {
+    inputs_[0] = obj;
+    inputs_[1] = val;
+  }
 
   DECLARE_INSTRUCTION(StoreNamed)
+  DECLARE_HYDROGEN_ACCESSOR(StoreNamed)
 
-  virtual void PrintDataTo(StringStream* stream) const;
+  virtual void PrintDataTo(StringStream* stream);
 
-  LOperand* object() const { return object_; }
-  Handle<Object> name() const { return name_; }
-  LOperand* value() const { return value_; }
-
- private:
-  LOperand* object_;
-  Handle<Object> name_;
-  LOperand* value_;
+  LOperand* object() { return inputs_[0]; }
+  LOperand* value() { return inputs_[1]; }
+  Handle<Object> name() const { return hydrogen()->name(); }
 };
 
 
 class LStoreNamedField: public LStoreNamed {
  public:
-  LStoreNamedField(LOperand* obj,
-                   Handle<Object> name,
-                   LOperand* val,
-                   bool in_object,
-                   int offset,
-                   LOperand* temp,
-                   bool needs_write_barrier,
-                   Handle<Map> transition)
-      : LStoreNamed(obj, name, val),
-        is_in_object_(in_object),
-        offset_(offset),
-        temp_(temp),
-        needs_write_barrier_(needs_write_barrier),
-        transition_(transition) { }
+  LStoreNamedField(LOperand* obj, LOperand* val, LOperand* temp)
+      : LStoreNamed(obj, val) {
+    temps_[0] = temp;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(StoreNamedField, "store-named-field")
+  DECLARE_HYDROGEN_ACCESSOR(StoreNamedField)
 
-  bool is_in_object() { return is_in_object_; }
-  int offset() { return offset_; }
-  LOperand* temp() { return temp_; }
-  bool needs_write_barrier() { return needs_write_barrier_; }
-  Handle<Map> transition() const { return transition_; }
-  void set_transition(Handle<Map> map) { transition_ = map; }
-
- private:
-  bool is_in_object_;
-  int offset_;
-  LOperand* temp_;
-  bool needs_write_barrier_;
-  Handle<Map> transition_;
+  bool is_in_object() { return hydrogen()->is_in_object(); }
+  int offset() { return hydrogen()->offset(); }
+  bool needs_write_barrier() { return hydrogen()->NeedsWriteBarrier(); }
+  Handle<Map> transition() const { return hydrogen()->transition(); }
 };
 
 
-class LStoreNamedGeneric: public LStoreNamed {
+class LStoreNamedGeneric: public LTemplateInstruction<0, 3, 0> {
  public:
-  LStoreNamedGeneric(LOperand* obj,
-                     Handle<Object> name,
-                     LOperand* val)
-      : LStoreNamed(obj, name, val) { }
+  LStoreNamedGeneric(LOperand* context, LOperand* object, LOperand* value) {
+    inputs_[0] = context;
+    inputs_[1] = object;
+    inputs_[2] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(StoreNamedGeneric, "store-named-generic")
+  DECLARE_HYDROGEN_ACCESSOR(StoreNamedGeneric)
+
+  LOperand* context() { return inputs_[0]; }
+  LOperand* object() { return inputs_[1]; }
+  LOperand* value() { return inputs_[2]; }
+  Handle<Object> name() const { return hydrogen()->name(); }
 };
 
 
-class LStoreKeyed: public LInstruction {
+class LStoreKeyed: public LTemplateInstruction<0, 3, 0> {
  public:
-  LStoreKeyed(LOperand* obj, LOperand* key, LOperand* val)
-      : object_(obj), key_(key), value_(val) { }
+  LStoreKeyed(LOperand* obj, LOperand* key, LOperand* val) {
+    inputs_[0] = obj;
+    inputs_[1] = key;
+    inputs_[2] = val;
+  }
 
   DECLARE_INSTRUCTION(StoreKeyed)
 
-  virtual void PrintDataTo(StringStream* stream) const;
+  virtual void PrintDataTo(StringStream* stream);
 
-  LOperand* object() const { return object_; }
-  LOperand* key() const { return key_; }
-  LOperand* value() const { return value_; }
-
- private:
-  LOperand* object_;
-  LOperand* key_;
-  LOperand* value_;
+  LOperand* object() { return inputs_[0]; }
+  LOperand* key() { return inputs_[1]; }
+  LOperand* value() { return inputs_[2]; }
 };
 
 
 class LStoreKeyedFastElement: public LStoreKeyed {
  public:
   LStoreKeyedFastElement(LOperand* obj, LOperand* key, LOperand* val)
       : LStoreKeyed(obj, key, val) {}
 
   DECLARE_CONCRETE_INSTRUCTION(StoreKeyedFastElement,
                                "store-keyed-fast-element")
   DECLARE_HYDROGEN_ACCESSOR(StoreKeyedFastElement)
 };
 
 
-class LStoreKeyedGeneric: public LStoreKeyed {
+class LStoreKeyedGeneric: public LTemplateInstruction<0, 4, 0> {
  public:
-  LStoreKeyedGeneric(LOperand* obj, LOperand* key, LOperand* val)
-      : LStoreKeyed(obj, key, val) { }
+  LStoreKeyedGeneric(LOperand* context,
+                     LOperand* object,
+                     LOperand* key,
+                     LOperand* value) {
+    inputs_[0] = context;
+    inputs_[1] = object;
+    inputs_[2] = key;
+    inputs_[3] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(StoreKeyedGeneric, "store-keyed-generic")
+
+  LOperand* context() { return inputs_[0]; }
+  LOperand* object() { return inputs_[1]; }
+  LOperand* key() { return inputs_[2]; }
+  LOperand* value() { return inputs_[3]; }
 };
 
 
-class LCheckFunction: public LUnaryOperation {
+class LStringCharCodeAt: public LTemplateInstruction<1, 2, 0> {
  public:
-  explicit LCheckFunction(LOperand* use) : LUnaryOperation(use) { }
+  LStringCharCodeAt(LOperand* string, LOperand* index) {
+    inputs_[0] = string;
+    inputs_[1] = index;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(StringCharCodeAt, "string-char-code-at")
+  DECLARE_HYDROGEN_ACCESSOR(StringCharCodeAt)
+
+  LOperand* string() { return inputs_[0]; }
+  LOperand* index() { return inputs_[1]; }
+};
+
+
+class LStringLength: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LStringLength(LOperand* string) {
+    inputs_[0] = string;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(StringLength, "string-length")
+  DECLARE_HYDROGEN_ACCESSOR(StringLength)
+
+  LOperand* string() { return inputs_[0]; }
+};
+
+
+class LCheckFunction: public LTemplateInstruction<0, 1, 0> {
+ public:
+  explicit LCheckFunction(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(CheckFunction, "check-function")
   DECLARE_HYDROGEN_ACCESSOR(CheckFunction)
 };
 
 
-class LCheckInstanceType: public LUnaryOperation {
+class LCheckInstanceType: public LTemplateInstruction<0, 1, 1> {
  public:
-  LCheckInstanceType(LOperand* use, LOperand* temp)
-      : LUnaryOperation(use), temp_(temp) { }
+  LCheckInstanceType(LOperand* value, LOperand* temp) {
+    inputs_[0] = value;
+    temps_[0] = temp;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(CheckInstanceType, "check-instance-type")
   DECLARE_HYDROGEN_ACCESSOR(CheckInstanceType)
-
-  LOperand* temp() const { return temp_; }
-
- private:
-  LOperand* temp_;
 };
 
 
-class LCheckMap: public LUnaryOperation {
+class LCheckMap: public LTemplateInstruction<0, 1, 0> {
  public:
-  explicit LCheckMap(LOperand* use) : LUnaryOperation(use) { }
+  explicit LCheckMap(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(CheckMap, "check-map")
   DECLARE_HYDROGEN_ACCESSOR(CheckMap)
 };
 
 
-class LCheckPrototypeMaps: public LInstruction {
+class LCheckPrototypeMaps: public LTemplateInstruction<0, 0, 1> {
  public:
-  LCheckPrototypeMaps(LOperand* temp,
-                      Handle<JSObject> holder,
-                      Handle<Map> receiver_map)
-      : temp_(temp),
-        holder_(holder),
-        receiver_map_(receiver_map) { }
+  explicit LCheckPrototypeMaps(LOperand* temp)  {
+    temps_[0] = temp;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(CheckPrototypeMaps, "check-prototype-maps")
+  DECLARE_HYDROGEN_ACCESSOR(CheckPrototypeMaps)
 
-  LOperand* temp() const { return temp_; }
-  Handle<JSObject> holder() const { return holder_; }
-  Handle<Map> receiver_map() const { return receiver_map_; }
-
- private:
-  LOperand* temp_;
-  Handle<JSObject> holder_;
-  Handle<Map> receiver_map_;
+  Handle<JSObject> prototype() const { return hydrogen()->prototype(); }
+  Handle<JSObject> holder() const { return hydrogen()->holder(); }
 };
 
 
-class LCheckSmi: public LUnaryOperation {
+class LCheckSmi: public LTemplateInstruction<0, 1, 0> {
  public:
-  LCheckSmi(LOperand* use, Condition condition)
-      : LUnaryOperation(use), condition_(condition) { }
+  LCheckSmi(LOperand* value, Condition condition)
+      : condition_(condition) {
+    inputs_[0] = value;
+  }
 
   Condition condition() const { return condition_; }
 
   virtual void CompileToNative(LCodeGen* generator);
   virtual const char* Mnemonic() const {
     return (condition_ == zero) ? "check-non-smi" : "check-smi";
   }
 
  private:
   Condition condition_;
 };
 
 
-class LMaterializedLiteral: public LInstruction {
- public:
-  DECLARE_INSTRUCTION(MaterializedLiteral)
-};
-
-
-class LArrayLiteral: public LMaterializedLiteral {
+class LArrayLiteral: public LTemplateInstruction<1, 0, 0> {
  public:
   DECLARE_CONCRETE_INSTRUCTION(ArrayLiteral, "array-literal")
   DECLARE_HYDROGEN_ACCESSOR(ArrayLiteral)
 };
 
 
-class LObjectLiteral: public LMaterializedLiteral {
+class LObjectLiteral: public LTemplateInstruction<1, 1, 0> {
  public:
+  explicit LObjectLiteral(LOperand* context) {
+    inputs_[0] = context;
+  }
+
   DECLARE_CONCRETE_INSTRUCTION(ObjectLiteral, "object-literal")
   DECLARE_HYDROGEN_ACCESSOR(ObjectLiteral)
+
+  LOperand* context() { return inputs_[0]; }
 };
 
 
-class LRegExpLiteral: public LMaterializedLiteral {
+class LRegExpLiteral: public LTemplateInstruction<1, 0, 0> {
  public:
   DECLARE_CONCRETE_INSTRUCTION(RegExpLiteral, "regexp-literal")
   DECLARE_HYDROGEN_ACCESSOR(RegExpLiteral)
 };
 
 
-class LFunctionLiteral: public LInstruction {
+class LFunctionLiteral: public LTemplateInstruction<1, 0, 0> {
  public:
   DECLARE_CONCRETE_INSTRUCTION(FunctionLiteral, "function-literal")
   DECLARE_HYDROGEN_ACCESSOR(FunctionLiteral)
 
   Handle<SharedFunctionInfo> shared_info() { return hydrogen()->shared_info(); }
 };
 
 
-class LTypeof: public LUnaryOperation {
+class LTypeof: public LTemplateInstruction<1, 1, 0> {
  public:
-  explicit LTypeof(LOperand* input) : LUnaryOperation(input) { }
+  explicit LTypeof(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(Typeof, "typeof")
 };
 
 
-class LTypeofIs: public LUnaryOperation {
+class LTypeofIs: public LTemplateInstruction<1, 1, 0> {
  public:
-  explicit LTypeofIs(LOperand* input) : LUnaryOperation(input) { }
-  virtual void PrintDataTo(StringStream* stream) const;
+  explicit LTypeofIs(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(TypeofIs, "typeof-is")
   DECLARE_HYDROGEN_ACCESSOR(TypeofIs)
 
   Handle<String> type_literal() { return hydrogen()->type_literal(); }
+
+  virtual void PrintDataTo(StringStream* stream);
 };
 
 
-class LTypeofIsAndBranch: public LTypeofIs {
+class LTypeofIsAndBranch: public LControlInstruction<1, 0> {
  public:
-  LTypeofIsAndBranch(LOperand* value,
-                     int true_block_id,
-                     int false_block_id)
-      : LTypeofIs(value),
-        true_block_id_(true_block_id),
-        false_block_id_(false_block_id) { }
+  explicit LTypeofIsAndBranch(LOperand* value) {
+    inputs_[0] = value;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(TypeofIsAndBranch, "typeof-is-and-branch")
+  DECLARE_HYDROGEN_ACCESSOR(TypeofIs)
 
-  virtual void PrintDataTo(StringStream* stream) const;
-  virtual bool IsControl() const { return true; }
+  Handle<String> type_literal() { return hydrogen()->type_literal(); }
 
-  int true_block_id() const { return true_block_id_; }
-  int false_block_id() const { return false_block_id_; }
-
- private:
-  int true_block_id_;
-  int false_block_id_;
+  virtual void PrintDataTo(StringStream* stream);
 };
 
 
-class LDeleteProperty: public LBinaryOperation {
+class LDeleteProperty: public LTemplateInstruction<1, 2, 0> {
  public:
-  LDeleteProperty(LOperand* obj, LOperand* key) : LBinaryOperation(obj, key) {}
+  LDeleteProperty(LOperand* obj, LOperand* key) {
+    inputs_[0] = obj;
+    inputs_[1] = key;
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(DeleteProperty, "delete-property")
 
-  LOperand* object() const { return left(); }
-  LOperand* key() const { return right(); }
+  LOperand* object() { return inputs_[0]; }
+  LOperand* key() { return inputs_[1]; }
 };
 
 
-class LOsrEntry: public LInstruction {
+class LOsrEntry: public LTemplateInstruction<0, 0, 0> {
  public:
   LOsrEntry();
 
   DECLARE_CONCRETE_INSTRUCTION(OsrEntry, "osr-entry")
 
   LOperand** SpilledRegisterArray() { return register_spills_; }
   LOperand** SpilledDoubleRegisterArray() { return double_register_spills_; }
 
   void MarkSpilledRegister(int allocation_index, LOperand* spill_operand);
   void MarkSpilledDoubleRegister(int allocation_index,
                                  LOperand* spill_operand);
 
  private:
   // Arrays of spill slot operands for registers with an assigned spill
   // slot, i.e., that must also be restored to the spill slot on OSR entry.
   // NULL if the register has no assigned spill slot.  Indexed by allocation
   // index.
   LOperand* register_spills_[Register::kNumAllocatableRegisters];
   LOperand* double_register_spills_[DoubleRegister::kNumAllocatableRegisters];
 };
 
 
-class LStackCheck: public LInstruction {
+class LStackCheck: public LTemplateInstruction<0, 0, 0> {
  public:
   DECLARE_CONCRETE_INSTRUCTION(StackCheck, "stack-check")
 };
 
 
-class LPointerMap: public ZoneObject {
- public:
-  explicit LPointerMap(int position)
-      : pointer_operands_(8), position_(position), lithium_position_(-1) { }
-
-  const ZoneList<LOperand*>* operands() const { return &pointer_operands_; }
-  int position() const { return position_; }
-  int lithium_position() const { return lithium_position_; }
-
-  void set_lithium_position(int pos) {
-    ASSERT(lithium_position_ == -1);
-    lithium_position_ = pos;
-  }
-
-  void RecordPointer(LOperand* op);
-  void PrintTo(StringStream* stream) const;
-
- private:
-  ZoneList<LOperand*> pointer_operands_;
-  int position_;
-  int lithium_position_;
-};
-
-
-class LEnvironment: public ZoneObject {
- public:
-  LEnvironment(Handle<JSFunction> closure,
-               int ast_id,
-               int parameter_count,
-               int argument_count,
-               int value_count,
-               LEnvironment* outer)
-      : closure_(closure),
-        arguments_stack_height_(argument_count),
-        deoptimization_index_(Safepoint::kNoDeoptimizationIndex),
-        translation_index_(-1),
-        ast_id_(ast_id),
-        parameter_count_(parameter_count),
-        values_(value_count),
-        representations_(value_count),
-        spilled_registers_(NULL),
-        spilled_double_registers_(NULL),
-        outer_(outer) {
-  }
-
-  Handle<JSFunction> closure() const { return closure_; }
-  int arguments_stack_height() const { return arguments_stack_height_; }
-  int deoptimization_index() const { return deoptimization_index_; }
-  int translation_index() const { return translation_index_; }
-  int ast_id() const { return ast_id_; }
-  int parameter_count() const { return parameter_count_; }
-  const ZoneList<LOperand*>* values() const { return &values_; }
-  LEnvironment* outer() const { return outer_; }
-
-  void AddValue(LOperand* operand, Representation representation) {
-    values_.Add(operand);
-    representations_.Add(representation);
-  }
-
-  bool HasTaggedValueAt(int index) const {
-    return representations_[index].IsTagged();
-  }
-
-  void Register(int deoptimization_index, int translation_index) {
-    ASSERT(!HasBeenRegistered());
-    deoptimization_index_ = deoptimization_index;
-    translation_index_ = translation_index;
-  }
-  bool HasBeenRegistered() const {
-    return deoptimization_index_ != Safepoint::kNoDeoptimizationIndex;
-  }
-
-  void SetSpilledRegisters(LOperand** registers,
-                           LOperand** double_registers) {
-    spilled_registers_ = registers;
-    spilled_double_registers_ = double_registers;
-  }
-
-  // Emit frame translation commands for this environment.
-  void WriteTranslation(LCodeGen* cgen, Translation* translation) const;
-
-  void PrintTo(StringStream* stream) const;
-
- private:
-  Handle<JSFunction> closure_;
-  int arguments_stack_height_;
-  int deoptimization_index_;
-  int translation_index_;
-  int ast_id_;
-  int parameter_count_;
-  ZoneList<LOperand*> values_;
-  ZoneList<Representation> representations_;
-
-  // Allocation index indexed arrays of spill slot operands for registers
-  // that are also in spill slots at an OSR entry.  NULL for environments
-  // that do not correspond to an OSR entry.
-  LOperand** spilled_registers_;
-  LOperand** spilled_double_registers_;
-
-  LEnvironment* outer_;
-};
-
 class LChunkBuilder;
 class LChunk: public ZoneObject {
  public:
-  explicit LChunk(HGraph* graph);
+  explicit LChunk(HGraph* graph)
+    : spill_slot_count_(0),
+      graph_(graph),
+      instructions_(32),
+      pointer_maps_(8),
+      inlined_closures_(1) { }
 
-  int AddInstruction(LInstruction* instruction, HBasicBlock* block);
+  void AddInstruction(LInstruction* instruction, HBasicBlock* block);
   LConstantOperand* DefineConstantOperand(HConstant* constant);
   Handle<Object> LookupLiteral(LConstantOperand* operand) const;
   Representation LookupLiteralRepresentation(LConstantOperand* operand) const;
 
   int GetNextSpillIndex(bool is_double);
   LOperand* GetNextSpillSlot(bool is_double);
 
   int ParameterAt(int index);
   int GetParameterStackSlot(int index) const;
   int spill_slot_count() const { return spill_slot_count_; }
@@ skipping 24 matching lines @@
   }
 
   const ZoneList<Handle<JSFunction> >* inlined_closures() const {
     return &inlined_closures_;
   }
 
   void AddInlinedClosure(Handle<JSFunction> closure) {
     inlined_closures_.Add(closure);
   }
 
-  void Verify() const;
-
  private:
   int spill_slot_count_;
   HGraph* const graph_;
   ZoneList<LInstruction*> instructions_;
   ZoneList<LPointerMap*> pointer_maps_;
   ZoneList<Handle<JSFunction> > inlined_closures_;
 };
 
 
 class LChunkBuilder BASE_EMBEDDED {
  public:
   LChunkBuilder(HGraph* graph, LAllocator* allocator)
       : chunk_(NULL),
         graph_(graph),
         status_(UNUSED),
         current_instruction_(NULL),
         current_block_(NULL),
         next_block_(NULL),
         argument_count_(0),
         allocator_(allocator),
         position_(RelocInfo::kNoPosition),
-        instructions_pending_deoptimization_environment_(NULL),
+        instruction_pending_deoptimization_environment_(NULL),
         pending_deoptimization_ast_id_(AstNode::kNoNumber) { }
 
   // Build the sequence for the graph.
   LChunk* Build();
 
   // Declare methods that deal with the individual node types.
 #define DECLARE_DO(type) LInstruction* Do##type(H##type* node);
   HYDROGEN_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
 #undef DECLARE_DO
 
@@ skipping 14 matching lines @@
   bool is_aborted() const { return status_ == ABORTED; }
 
   void Abort(const char* format, ...);
 
   // Methods for getting operands for Use / Define / Temp.
   LRegister* ToOperand(Register reg);
   LUnallocated* ToUnallocated(Register reg);
   LUnallocated* ToUnallocated(XMMRegister reg);
 
   // Methods for setting up define-use relationships.
-  LOperand* Use(HValue* value, LUnallocated* operand);
-  LOperand* UseFixed(HValue* value, Register fixed_register);
-  LOperand* UseFixedDouble(HValue* value, XMMRegister fixed_register);
+  MUST_USE_RESULT LOperand* Use(HValue* value, LUnallocated* operand);
+  MUST_USE_RESULT LOperand* UseFixed(HValue* value, Register fixed_register);
+  MUST_USE_RESULT LOperand* UseFixedDouble(HValue* value,
+                                           XMMRegister fixed_register);
 
   // A value that is guaranteed to be allocated to a register.
   // Operand created by UseRegister is guaranteed to be live until the end of
   // instruction. This means that register allocator will not reuse it's
   // register for any other operand inside instruction.
   // Operand created by UseRegisterAtStart is guaranteed to be live only at
   // instruction start. Register allocator is free to assign the same register
   // to some other operand used inside instruction (i.e. temporary or
   // output).
-  LOperand* UseRegister(HValue* value);
-  LOperand* UseRegisterAtStart(HValue* value);
+  MUST_USE_RESULT LOperand* UseRegister(HValue* value);
+  MUST_USE_RESULT LOperand* UseRegisterAtStart(HValue* value);
 
-  // A value in a register that may be trashed.
-  LOperand* UseTempRegister(HValue* value);
-  LOperand* Use(HValue* value);
-  LOperand* UseAtStart(HValue* value);
-  LOperand* UseOrConstant(HValue* value);
-  LOperand* UseOrConstantAtStart(HValue* value);
-  LOperand* UseRegisterOrConstant(HValue* value);
-  LOperand* UseRegisterOrConstantAtStart(HValue* value);
+  // An input operand in a register that may be trashed.
+  MUST_USE_RESULT LOperand* UseTempRegister(HValue* value);
+
+  // An input operand in a register or stack slot.
+  MUST_USE_RESULT LOperand* Use(HValue* value);
+  MUST_USE_RESULT LOperand* UseAtStart(HValue* value);
+
+  // An input operand in a register, stack slot or a constant operand.
+  MUST_USE_RESULT LOperand* UseOrConstant(HValue* value);
+  MUST_USE_RESULT LOperand* UseOrConstantAtStart(HValue* value);
+
+  // An input operand in a register or a constant operand.
+  MUST_USE_RESULT LOperand* UseRegisterOrConstant(HValue* value);
+  MUST_USE_RESULT LOperand* UseRegisterOrConstantAtStart(HValue* value);
+
+  // An input operand in register, stack slot or a constant operand.
+  // Will not be moved to a register even if one is freely available.
+  MUST_USE_RESULT LOperand* UseAny(HValue* value);
+
+  // Temporary operand that must be in a register.
+  MUST_USE_RESULT LUnallocated* TempRegister();
+  MUST_USE_RESULT LOperand* FixedTemp(Register reg);
+  MUST_USE_RESULT LOperand* FixedTemp(XMMRegister reg);
 
   // Methods for setting up define-use relationships.
   // Return the same instruction that they are passed.
-  LInstruction* Define(LInstruction* instr, LUnallocated* result);
-  LInstruction* Define(LInstruction* instr);
-  LInstruction* DefineAsRegister(LInstruction* instr);
-  LInstruction* DefineAsSpilled(LInstruction* instr, int index);
-  LInstruction* DefineSameAsFirst(LInstruction* instr);
-  LInstruction* DefineFixed(LInstruction* instr, Register reg);
-  LInstruction* DefineFixedDouble(LInstruction* instr, XMMRegister reg);
+  template<int I, int T>
+      LInstruction* Define(LTemplateInstruction<1, I, T>* instr,
+                           LUnallocated* result);
+  template<int I, int T>
+      LInstruction* Define(LTemplateInstruction<1, I, T>* instr);
+  template<int I, int T>
+      LInstruction* DefineAsRegister(LTemplateInstruction<1, I, T>* instr);
+  template<int I, int T>
+      LInstruction* DefineAsSpilled(LTemplateInstruction<1, I, T>* instr,
+                                    int index);
+  template<int I, int T>
+      LInstruction* DefineSameAsFirst(LTemplateInstruction<1, I, T>* instr);
+  template<int I, int T>
+      LInstruction* DefineFixed(LTemplateInstruction<1, I, T>* instr,
+                                Register reg);
+  template<int I, int T>
+      LInstruction* DefineFixedDouble(LTemplateInstruction<1, I, T>* instr,
+                                      XMMRegister reg);
   LInstruction* AssignEnvironment(LInstruction* instr);
   LInstruction* AssignPointerMap(LInstruction* instr);
 
   enum CanDeoptimize { CAN_DEOPTIMIZE_EAGERLY, CANNOT_DEOPTIMIZE_EAGERLY };
 
   // By default we assume that instruction sequences generated for calls
   // cannot deoptimize eagerly and we do not attach environment to this
   // instruction.
   LInstruction* MarkAsCall(
       LInstruction* instr,
       HInstruction* hinstr,
       CanDeoptimize can_deoptimize = CANNOT_DEOPTIMIZE_EAGERLY);
+  LInstruction* MarkAsSaveDoubles(LInstruction* instr);
 
   LInstruction* SetInstructionPendingDeoptimizationEnvironment(
       LInstruction* instr, int ast_id);
   void ClearInstructionPendingDeoptimizationEnvironment();
 
   LEnvironment* CreateEnvironment(HEnvironment* hydrogen_env);
 
-  // Temporary operand that may be a memory location.
-  LOperand* Temp();
-  // Temporary operand that must be in a register.
-  LUnallocated* TempRegister();
-  LOperand* FixedTemp(Register reg);
-  LOperand* FixedTemp(XMMRegister reg);
-
   void VisitInstruction(HInstruction* current);
 
   void DoBasicBlock(HBasicBlock* block, HBasicBlock* next_block);
   LInstruction* DoBit(Token::Value op, HBitwiseBinaryOperation* instr);
   LInstruction* DoShift(Token::Value op, HBitwiseBinaryOperation* instr);
   LInstruction* DoArithmeticD(Token::Value op,
                               HArithmeticBinaryOperation* instr);
   LInstruction* DoArithmeticT(Token::Value op,
                               HArithmeticBinaryOperation* instr);
 
   LChunk* chunk_;
   HGraph* const graph_;
   Status status_;
   HInstruction* current_instruction_;
   HBasicBlock* current_block_;
   HBasicBlock* next_block_;
   int argument_count_;
   LAllocator* allocator_;
   int position_;
-  LInstruction* instructions_pending_deoptimization_environment_;
+  LInstruction* instruction_pending_deoptimization_environment_;
   int pending_deoptimization_ast_id_;
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_LITHIUM_IA32_H_