HydrogenCodeStubs consume stack arguments via descriptor.

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 405 matching lines @@
   explicit PlatformCodeStub(Isolate* isolate) : CodeStub(isolate) {}
 
   // Generates the assembler code for the stub.
   virtual void Generate(MacroAssembler* masm) = 0;
 
   DEFINE_CODE_STUB_BASE(PlatformCodeStub, CodeStub);
 };
 
 
 enum StubFunctionMode { NOT_JS_FUNCTION_STUB_MODE, JS_FUNCTION_STUB_MODE };
-enum HandlerArgumentsMode { DONT_PASS_ARGUMENTS, PASS_ARGUMENTS };
 
 
 class CodeStubDescriptor {
  public:
   explicit CodeStubDescriptor(CodeStub* stub);
 
   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,
-                  HandlerArgumentsMode handler_mode = DONT_PASS_ARGUMENTS);
+                  StubFunctionMode function_mode = NOT_JS_FUNCTION_STUB_MODE);
 
   void SetMissHandler(ExternalReference handler) {
     miss_handler_ = handler;
     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 {
     return call_descriptor().GetRegisterParameterCount();
   }
 
+  int GetStackParameterCount() const {
+    return call_descriptor().GetStackParameterCount();
+  }
+
+  int GetParameterCount() const {
+    return call_descriptor().GetParameterCount();
+  }
+
   Register GetRegisterParameter(int index) const {
     return call_descriptor().GetRegisterParameter(index);
   }
 
   Type* GetParameterType(int index) const {
     return call_descriptor().GetParameterType(index);
   }
 
   ExternalReference miss_handler() const {
     DCHECK(has_miss_handler_);
     return miss_handler_;
   }
 
   bool has_miss_handler() const {
     return has_miss_handler_;
   }
 
   int GetHandlerParameterCount() const {
-    int params = GetRegisterParameterCount();
-    if (handler_arguments_mode_ == PASS_ARGUMENTS) {
+    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();
+  }
+
   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_;
-  HandlerArgumentsMode handler_arguments_mode_;
 
   ExternalReference miss_handler_;
   bool has_miss_handler_;
 };
 
 
 class HydrogenCodeStub : public CodeStub {
  public:
   enum InitializationState {
     UNINITIALIZED,
@@ skipping 2552 matching lines @@
 #undef DEFINE_PLATFORM_CODE_STUB
 #undef DEFINE_HANDLER_CODE_STUB
 #undef DEFINE_HYDROGEN_CODE_STUB
 #undef DEFINE_CODE_STUB
 #undef DEFINE_CODE_STUB_BASE
 
 extern Representation RepresentationFromType(Type* type);
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_