The IC exposes a register definition.

src/ic.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_IC_H_
 #define V8_IC_H_
 
 #include "src/macro-assembler.h"
 
 namespace v8 {
@@ skipping 380 matching lines @@
                     ConstantPoolArray* constant_pool);
 };
 
 
 class LoadIC: public IC {
  public:
   // ExtraICState bits
   class ContextualModeBits: public BitField<ContextualMode, 0, 1> {};
   STATIC_ASSERT(static_cast<int>(NOT_CONTEXTUAL) == 0);
 
+  enum RegisterInfo {
+    kReceiverIndex,
+    kNameIndex,
+    kRegisterArgumentCount
+  };
+  static const Register ReceiverRegister();
+  static const Register NameRegister();
+
   static ExtraICState ComputeExtraICState(ContextualMode contextual_mode) {
     return ContextualModeBits::encode(contextual_mode);
   }
 
   static ContextualMode GetContextualMode(ExtraICState state) {
     return ContextualModeBits::decode(state);
   }
 
   ContextualMode contextual_mode() const {
     return ContextualModeBits::decode(extra_ic_state());
@@ skipping 80 matching lines @@
 };
 
 
 class KeyedLoadIC: public LoadIC {
  public:
   explicit KeyedLoadIC(FrameDepth depth, Isolate* isolate)
       : LoadIC(depth, isolate) {
     ASSERT(target()->is_keyed_load_stub());
   }
 
+  static const Register ReceiverRegister();
+  static const Register NameRegister();
+
   MUST_USE_RESULT MaybeHandle<Object> Load(Handle<Object> object,
                                            Handle<Object> key);
 
   // Code generator routines.
   static void GenerateMiss(MacroAssembler* masm);
   static void GenerateRuntimeGetProperty(MacroAssembler* masm);
   static void GenerateInitialize(MacroAssembler* masm) { GenerateMiss(masm); }
   static void GeneratePreMonomorphic(MacroAssembler* masm) {
     GenerateMiss(masm);
   }
@@ skipping 503 matching lines @@
 DECLARE_RUNTIME_FUNCTION(ElementsTransitionAndStoreIC_Miss);
 DECLARE_RUNTIME_FUNCTION(BinaryOpIC_Miss);
 DECLARE_RUNTIME_FUNCTION(BinaryOpIC_MissWithAllocationSite);
 DECLARE_RUNTIME_FUNCTION(CompareNilIC_Miss);
 DECLARE_RUNTIME_FUNCTION(ToBooleanIC_Miss);
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_IC_H_