Preview of a first step towards unification of hydrogen calls

src/code-stubs.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 301 matching lines @@
 
   ExternalReference miss_handler() {
     ASSERT(has_miss_handler_);
     return miss_handler_;
   }
 
   bool has_miss_handler() {
     return has_miss_handler_;
   }
 
-  Register GetParameterRegister(int index) {
+  Register GetParameterRegister(int index) const {
     return register_params_[index];
   }
 
   bool IsParameterCountRegister(int index) {
     return GetParameterRegister(index).is(stack_parameter_count_);
   }
 
   int GetHandlerParameterCount() {
     int params = environment_length();
     if (handler_arguments_mode_ == PASS_ARGUMENTS) {
       params += 1;
     }
     return params;
   }
 
  private:
   ExternalReference miss_handler_;
   bool has_miss_handler_;
 };
 
 
+struct PlatformCallInterfaceDescriptor;
+
+
+struct CallInterfaceDescriptor {
+  CallInterfaceDescriptor()
+      : register_param_count_(-1),
+        register_params_(NULL),
+        param_representations_(NULL),
+        platform_specific_descriptor_(NULL) { }
+
+  bool initialized() const { return register_param_count_ >= 0; }
+
+  int environment_length() const {
+    return register_param_count_;
+  }
+
+  Representation GetParameterRepresentation(int index) const {
+    return param_representations_[index];
+  }
+
+  Register GetParameterRegister(int index) const {
+    return register_params_[index];
+  }
+
+  PlatformCallInterfaceDescriptor* platform_specific_descriptor() const {
+    return platform_specific_descriptor_;
+  }
+
+  int register_param_count_;
+  Register* register_params_;
+  Representation* param_representations_;
+  PlatformCallInterfaceDescriptor* platform_specific_descriptor_;
+};
+
+
 class HydrogenCodeStub : public CodeStub {
  public:
   enum InitializationState {
     UNINITIALIZED,
     INITIALIZED
   };
 
   explicit HydrogenCodeStub(InitializationState state = INITIALIZED) {
     is_uninitialized_ = (state == UNINITIALIZED);
   }
@@ skipping 2071 matching lines @@
                                   Isolate* isolate);
 
   Major MajorKey() { return ProfileEntryHook; }
   int MinorKey() { return 0; }
 
   void Generate(MacroAssembler* masm);
 
   DISALLOW_COPY_AND_ASSIGN(ProfileEntryHookStub);
 };
 
+
+class CallDescriptors {
+ public:
+  static void InitializeForIsolate(Isolate* isolate);
+};
+
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_