Add a flag to help platform ports bootstrap V8

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 30 matching lines @@
   V(MathPow)                                \
   V(ProfileEntryHook)                       \
   V(RecordWrite)                            \
   V(RegExpExec)                             \
   V(StoreBufferOverflow)                    \
   V(StoreElement)                           \
   V(StubFailureTrampoline)                  \
   V(SubString)                              \
   V(ToString)                               \
   V(ToName)                                 \
-  V(ToObject)                               \
   V(StoreICTrampoline)                      \
   V(KeyedStoreICTrampoline)                 \
   V(StoreIC)                                \
   V(KeyedStoreIC)                           \
   V(KeyedLoadIC)                            \
   V(LoadIC)                                 \
   V(LoadGlobalIC)                           \
   V(FastNewObject)                          \
   V(FastNewRestParameter)                   \
   V(FastNewSloppyArguments)                 \
   V(FastNewStrictArguments)                 \
   /* HydrogenCodeStubs */                   \
   V(BinaryOpIC)                             \
   V(BinaryOpWithAllocationSite)             \
   V(ElementsTransitionAndStore)             \
   V(FastArrayPush)                          \
   V(FastCloneRegExp)                        \
   V(FastCloneShallowArray)                  \
   V(FastFunctionBind)                       \
   V(GrowArrayElements)                      \
   V(KeyedLoadGeneric)                       \
   V(LoadScriptContextField)                 \
   V(LoadDictionaryElement)                  \
   V(NameDictionaryLookup)                   \
   V(NumberToString)                         \
+  V(ToObject)                               \
   V(Typeof)                                 \
   V(RegExpConstructResult)                  \
   V(StoreFastElement)                       \
   V(StoreGlobalViaContext)                  \
   V(StoreScriptContextField)                \
   V(StringAdd)                              \
   V(ToBooleanIC)                            \
   V(TransitionElementsKind)                 \
   /* TurboFanCodeStubs */                   \
   V(AllocateHeapNumber)                     \
@@ skipping 393 matching lines @@
   CodeStubDescriptor(Isolate* isolate, uint32_t stub_key);
 
   void Initialize(Address deoptimization_handler = NULL,
                   int hint_stack_parameter_count = -1,
                   StubFunctionMode function_mode = NOT_JS_FUNCTION_STUB_MODE);
   void Initialize(Register stack_parameter_count,
                   Address deoptimization_handler = NULL,
                   int hint_stack_parameter_count = -1,
                   StubFunctionMode function_mode = NOT_JS_FUNCTION_STUB_MODE);
 
-  void SetMissHandler(ExternalReference handler) {
-    miss_handler_ = handler;
+  void SetMissHandler(Runtime::FunctionId id) {
+    miss_handler_id_ = id;
+    miss_handler_ = ExternalReference(Runtime::FunctionForId(id), isolate_);
     has_miss_handler_ = true;
     // Our miss handler infrastructure doesn't currently support
     // variable stack parameter counts.
     DCHECK(!stack_parameter_count_.is_valid());
   }
 
   void set_call_descriptor(CallInterfaceDescriptor d) { call_descriptor_ = d; }
   CallInterfaceDescriptor call_descriptor() const { return call_descriptor_; }
 
   int GetRegisterParameterCount() const {
@@ skipping 14 matching lines @@
 
   Type* GetParameterType(int index) const {
     return call_descriptor().GetParameterType(index);
   }
 
   ExternalReference miss_handler() const {
     DCHECK(has_miss_handler_);
     return miss_handler_;
   }
 
+  Runtime::FunctionId miss_handler_id() const {
+    DCHECK(has_miss_handler_);
+    return miss_handler_id_;
+  }
+
   bool has_miss_handler() const {
     return has_miss_handler_;
   }
 
   int GetHandlerParameterCount() const {
     int params = GetParameterCount();
     if (PassesArgumentsToDeoptimizationHandler()) {
       params += 1;
     }
     return params;
   }
 
   int hint_stack_parameter_count() const { return hint_stack_parameter_count_; }
   Register stack_parameter_count() const { return stack_parameter_count_; }
   StubFunctionMode function_mode() const { return function_mode_; }
   Address deoptimization_handler() const { return deoptimization_handler_; }
 
  private:
   bool PassesArgumentsToDeoptimizationHandler() const {
     return stack_parameter_count_.is_valid();
   }
 
+  Isolate* isolate_;
   CallInterfaceDescriptor call_descriptor_;
   Register stack_parameter_count_;
   // If hint_stack_parameter_count_ > 0, the code stub can optimize the
   // return sequence. Default value is -1, which means it is ignored.
   int hint_stack_parameter_count_;
   StubFunctionMode function_mode_;
 
   Address deoptimization_handler_;
 
   ExternalReference miss_handler_;
+  Runtime::FunctionId miss_handler_id_;
   bool has_miss_handler_;
 };
 
 
 class HydrogenCodeStub : public CodeStub {
  public:
   enum InitializationState {
     UNINITIALIZED,
     INITIALIZED
   };
 
   template<class SubClass>
   static Handle<Code> GetUninitialized(Isolate* isolate) {
     SubClass::GenerateAheadOfTime(isolate);
     return SubClass().GetCode(isolate);
   }
 
   // Retrieve the code for the stub. Generate the code if needed.
   Handle<Code> GenerateCode() override = 0;
 
   bool IsUninitialized() const { return IsMissBits::decode(minor_key_); }
 
   Handle<Code> GenerateLightweightMissCode(ExternalReference miss);
 
+  Handle<Code> GenerateRuntimeTailCall(CodeStubDescriptor* descriptor);
+
   template<class StateType>
   void TraceTransition(StateType from, StateType to);
 
  protected:
   explicit HydrogenCodeStub(Isolate* isolate,
                             InitializationState state = INITIALIZED)
       : CodeStub(isolate) {
     minor_key_ = IsMissBits::encode(state == UNINITIALIZED);
   }
 
@@ skipping 2529 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_