[stubs] Port StringAddStub to TF

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/code-stub-assembler.h"
@@ skipping 42 matching lines @@
   /* This can be removed once there are no */ \
   /* more deopting Hydrogen stubs. */         \
   V(StubFailureTrampoline)                    \
   /* These are only called from FCG */        \
   /* They can be removed when only the TF  */ \
   /* version of the corresponding stub is  */ \
   /* used universally */                      \
   V(CallICTrampoline)                         \
   V(KeyedStoreICTrampoline)                   \
   /* --- HydrogenCodeStubs --- */             \
-  V(StringAdd)                                \
   /* These builtins w/ JS linkage are */      \
   /* just fast-cases of C++ builtins. They */ \
   /* require varg support from TF */          \
   V(FastArrayPush)                            \
   V(FastFunctionBind)                         \
   /* These will be ported/eliminated */       \
   /* as part of the new IC system, ask */     \
   /* ishell before doing anything  */         \
   V(LoadConstant)                             \
   V(LoadDictionaryElement)                    \
@@ skipping 38 matching lines @@
   V(FastCloneRegExp)                          \
   V(FastCloneShallowArray)                    \
   V(FastCloneShallowObject)                   \
   V(FastNewClosure)                           \
   V(FastNewFunctionContext)                   \
   V(KeyedLoadSloppyArguments)                 \
   V(KeyedStoreSloppyArguments)                \
   V(LoadScriptContextField)                   \
   V(StoreScriptContextField)                  \
   V(NumberToString)                           \
+  V(StringAdd)                                \
   V(GetProperty)                              \
   V(LoadIC)                                   \
   V(KeyedLoadICTF)                            \
   V(StoreFastElement)                         \
   V(StoreField)                               \
   V(StoreGlobal)                              \
   V(StoreIC)                                  \
   V(StoreInterceptor)                         \
   V(StoreMap)                                 \
   V(StoreTransition)                          \
@@ skipping 1471 matching lines @@
 
   BinaryOpWithAllocationSiteStub(Isolate* isolate, const BinaryOpICState& state)
       : BinaryOpICStub(isolate, state) {}
 
   Code::Kind GetCodeKind() const final { return Code::STUB; }
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(BinaryOpWithAllocationSite);
   DEFINE_HYDROGEN_CODE_STUB(BinaryOpWithAllocationSite, BinaryOpICStub);
 };
 
-
-class StringAddStub final : public HydrogenCodeStub {
+class StringAddStub final : public TurboFanCodeStub {
  public:
   StringAddStub(Isolate* isolate, StringAddFlags flags,
                 PretenureFlag pretenure_flag)
-      : HydrogenCodeStub(isolate) {
-    set_sub_minor_key(StringAddFlagsBits::encode(flags) |
-                      PretenureFlagBits::encode(pretenure_flag));
+      : TurboFanCodeStub(isolate) {
+    minor_key_ = (StringAddFlagsBits::encode(flags) |
+                  PretenureFlagBits::encode(pretenure_flag));
   }
 
   StringAddFlags flags() const {
-    return StringAddFlagsBits::decode(sub_minor_key());
+    return StringAddFlagsBits::decode(minor_key_);
   }
 
   PretenureFlag pretenure_flag() const {
-    return PretenureFlagBits::decode(sub_minor_key());
+    return PretenureFlagBits::decode(minor_key_);
   }
 
  private:
   class StringAddFlagsBits : public BitField<StringAddFlags, 0, 3> {};
   class PretenureFlagBits : public BitField<PretenureFlag, 3, 1> {};
 
   void PrintBaseName(std::ostream& os) const override;  // NOLINT
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(StringAdd);
-  DEFINE_HYDROGEN_CODE_STUB(StringAdd, HydrogenCodeStub);
+  DEFINE_TURBOFAN_CODE_STUB(StringAdd, TurboFanCodeStub);
 };
 
 
 class CompareICStub : public PlatformCodeStub {
  public:
   CompareICStub(Isolate* isolate, Token::Value op, CompareICState::State left,
                 CompareICState::State right, CompareICState::State state)
       : PlatformCodeStub(isolate) {
     DCHECK(Token::IsCompareOp(op));
     DCHECK(OpBits::is_valid(op - Token::EQ));
@@ skipping 1100 matching lines @@
 #undef DEFINE_HYDROGEN_CODE_STUB
 #undef DEFINE_CODE_STUB
 #undef DEFINE_CODE_STUB_BASE
 
 extern Representation RepresentationFromMachineType(MachineType type);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODE_STUBS_H_