[runtime] Optimize and unify rest parameters.

src/code-stubs.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_CODE_STUBS_H_
 #define V8_CODE_STUBS_H_
 
 #include "src/allocation.h"
 #include "src/assembler.h"
 #include "src/codegen.h"
@@ skipping 26 matching lines @@
   V(InternalArrayConstructor)               \
   V(JSEntry)                                \
   V(KeyedLoadICTrampoline)                  \
   V(LoadICTrampoline)                       \
   V(CallICTrampoline)                       \
   V(LoadIndexedInterceptor)                 \
   V(LoadIndexedString)                      \
   V(MathPow)                                \
   V(ProfileEntryHook)                       \
   V(RecordWrite)                            \
-  V(RestParamAccess)                        \
   V(RegExpExec)                             \
   V(StoreBufferOverflow)                    \
   V(StoreElement)                           \
   V(StringCompare)                          \
   V(StubFailureTrampoline)                  \
   V(SubString)                              \
   V(ToNumber)                               \
   V(ToLength)                               \
   V(ToString)                               \
   V(ToName)                                 \
@@ skipping 13 matching lines @@
   V(BinaryOpWithAllocationSite)             \
   V(CompareNilIC)                           \
   V(CreateAllocationSite)                   \
   V(CreateWeakCell)                         \
   V(ElementsTransitionAndStore)             \
   V(FastCloneRegExp)                        \
   V(FastCloneShallowArray)                  \
   V(FastCloneShallowObject)                 \
   V(FastNewClosure)                         \
   V(FastNewContext)                         \
+  V(FastNewRestParameter)                   \
   V(GrowArrayElements)                      \
   V(InternalArrayNArgumentsConstructor)     \
   V(InternalArrayNoArgumentConstructor)     \
   V(InternalArraySingleArgumentConstructor) \
   V(KeyedLoadGeneric)                       \
   V(LoadGlobalViaContext)                   \
   V(LoadScriptContextField)                 \
   V(LoadDictionaryElement)                  \
   V(NameDictionaryLookup)                   \
   V(NumberToString)                         \
@@ skipping 627 matching lines @@
   static const int kFunction = 0;
 
  private:
   class SlotsBits : public BitField<int, 0, 8> {};
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(FastNewContext);
   DEFINE_HYDROGEN_CODE_STUB(FastNewContext, HydrogenCodeStub);
 };
 
 
+// TODO(turbofan): This stub should be possible to write in TurboFan
+// using the CodeStubAssembler very soon in a way that is as efficient
+// and easy as the current handwritten version, which is partly a copy
+// of the strict arguments object materialization code.
+class FastNewRestParameterStub final : public PlatformCodeStub {
+ public:
+  explicit FastNewRestParameterStub(Isolate* isolate)
+      : PlatformCodeStub(isolate) {}
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(FastNewRestParameter);
+  DEFINE_PLATFORM_CODE_STUB(FastNewRestParameter, PlatformCodeStub);
+};
+
+
 class FastCloneRegExpStub final : public HydrogenCodeStub {
  public:
   explicit FastCloneRegExpStub(Isolate* isolate) : HydrogenCodeStub(isolate) {}
 
  private:
   DEFINE_CALL_INTERFACE_DESCRIPTOR(FastCloneRegExp);
   DEFINE_HYDROGEN_CODE_STUB(FastCloneRegExp, HydrogenCodeStub);
 };
 
 
@@ skipping 1109 matching lines @@
   void GenerateNewSloppySlow(MacroAssembler* masm);
 
   void PrintName(std::ostream& os) const override;  // NOLINT
 
   class TypeBits : public BitField<Type, 0, 2> {};
 
   DEFINE_PLATFORM_CODE_STUB(ArgumentsAccess, PlatformCodeStub);
 };
 
 
-class RestParamAccessStub : public PlatformCodeStub {
- public:
-  explicit RestParamAccessStub(Isolate* isolate) : PlatformCodeStub(isolate) {}
-
- private:
-  void GenerateNew(MacroAssembler* masm);
-
-  void PrintName(std::ostream& os) const override;  // NOLINT
-
-  DEFINE_CALL_INTERFACE_DESCRIPTOR(RestParamAccess);
-  DEFINE_PLATFORM_CODE_STUB(RestParamAccess, PlatformCodeStub);
-};
-
-
 class RegExpExecStub: public PlatformCodeStub {
  public:
   explicit RegExpExecStub(Isolate* isolate) : PlatformCodeStub(isolate) { }
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(ContextOnly);
   DEFINE_PLATFORM_CODE_STUB(RegExpExec, PlatformCodeStub);
 };
 
 
 class RegExpConstructResultStub final : public HydrogenCodeStub {
@@ skipping 1107 matching lines @@
 #undef DEFINE_HYDROGEN_CODE_STUB
 #undef DEFINE_CODE_STUB
 #undef DEFINE_CODE_STUB_BASE
 
 extern Representation RepresentationFromType(Type* type);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODE_STUBS_H_