Encapsulate megamorphic load/tail-call in hydrogen

src/x64/lithium-x64.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_X64_LITHIUM_X64_H_
 #define V8_X64_LITHIUM_X64_H_
 
 #include "src/hydrogen.h"
 #include "src/lithium.h"
 #include "src/lithium-allocator.h"
@@ skipping 133 matching lines @@
   V(StoreKeyed)                              \
   V(StoreKeyedGeneric)                       \
   V(StoreNamedField)                         \
   V(StoreNamedGeneric)                       \
   V(StringAdd)                               \
   V(StringCharCodeAt)                        \
   V(StringCharFromCode)                      \
   V(StringCompareAndBranch)                  \
   V(SubI)                                    \
   V(TaggedToI)                               \
+  V(TailCallThroughMegamorphicCache)         \
   V(ThisFunction)                            \
   V(ToFastProperties)                        \
   V(TransitionElementsKind)                  \
   V(TrapAllocationMemento)                   \
   V(Typeof)                                  \
   V(TypeofIsAndBranch)                       \
   V(Uint32ToDouble)                          \
   V(UnknownOSRValue)                         \
   V(WrapReceiver)
 
@@ skipping 318 matching lines @@
     inputs_[0] = context;
   }
 
   LOperand* context() { return inputs_[0]; }
 
   DECLARE_CONCRETE_INSTRUCTION(CallStub, "call-stub")
   DECLARE_HYDROGEN_ACCESSOR(CallStub)
 };
 
 
+class LTailCallThroughMegamorphicCache FINAL
+    : public LTemplateInstruction<0, 3, 0> {
+ public:
+  explicit LTailCallThroughMegamorphicCache(LOperand* context,
+                                            LOperand* receiver,
+                                            LOperand* name) {
+    inputs_[0] = context;
+    inputs_[1] = receiver;
+    inputs_[2] = name;
+  }
+
+  LOperand* context() { return inputs_[0]; }
+  LOperand* receiver() { return inputs_[1]; }
+  LOperand* name() { return inputs_[2]; }
+
+  DECLARE_CONCRETE_INSTRUCTION(TailCallThroughMegamorphicCache,
+                               "tail-call-through-megamorphic-cache")
+  DECLARE_HYDROGEN_ACCESSOR(TailCallThroughMegamorphicCache)
+};
+
+
 class LUnknownOSRValue FINAL : public LTemplateInstruction<1, 0, 0> {
  public:
   virtual bool HasInterestingComment(LCodeGen* gen) const OVERRIDE {
     return false;
   }
   DECLARE_CONCRETE_INSTRUCTION(UnknownOSRValue, "unknown-osr-value")
 };
 
 
 template<int I, int T>
@@ skipping 1377 matching lines @@
  public:
   LCallWithDescriptor(CallInterfaceDescriptor descriptor,
                       const ZoneList<LOperand*>& operands, Zone* zone)
       : inputs_(descriptor.GetRegisterParameterCount() + 1, zone) {
     DCHECK(descriptor.GetRegisterParameterCount() + 1 == operands.length());
     inputs_.AddAll(operands, zone);
   }
 
   LOperand* target() const { return inputs_[0]; }
 
+  DECLARE_HYDROGEN_ACCESSOR(CallWithDescriptor)
+
  private:
   DECLARE_CONCRETE_INSTRUCTION(CallWithDescriptor, "call-with-descriptor")
-  DECLARE_HYDROGEN_ACCESSOR(CallWithDescriptor)
 
   virtual void PrintDataTo(StringStream* stream) OVERRIDE;
 
   int arity() const { return hydrogen()->argument_count() - 1; }
 
   ZoneList<LOperand*> inputs_;
 
   // Iterator support.
   virtual int InputCount() FINAL OVERRIDE { return inputs_.length(); }
   virtual LOperand* InputAt(int i) FINAL OVERRIDE { return inputs_[i]; }
@@ skipping 984 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::int
 
 #endif  // V8_X64_LITHIUM_X64_H_