apiutils.h

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// Copyright 2012 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
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#ifndef V8_APIUTILS_H_
#define V8_APIUTILS_H_

namespace v8 {
class ImplementationUtilities {
 public:
  static int GetNameCount(ExtensionConfiguration* that) {
    return that->name_count_;
  }

  static const char** GetNames(ExtensionConfiguration* that) {
    return that->names_;
  }

  // Packs additional parameters for the NewArguments function. |implicit_args|
  // is a pointer to the last element of 4-elements array controlled by GC.
  static void PrepareArgumentsData(internal::Object** implicit_args,
                                   internal::Isolate* isolate,
                                   internal::Object* data,
                                   internal::JSFunction* callee,
                                   internal::Object* holder) {
    implicit_args[v8::Arguments::kDataIndex] = data;
    implicit_args[v8::Arguments::kCalleeIndex] = callee;
    implicit_args[v8::Arguments::kHolderIndex] = holder;
    implicit_args[v8::Arguments::kIsolateIndex] =
        reinterpret_cast<internal::Object*>(isolate);
  }

  static v8::Arguments NewArguments(internal::Object** implicit_args,
                                    internal::Object** argv, int argc,
                                    bool is_construct_call) {
    ASSERT(implicit_args[v8::Arguments::kCalleeIndex]->IsJSFunction());
    ASSERT(implicit_args[v8::Arguments::kHolderIndex]->IsHeapObject());
    // The implicit isolate argument is not tagged and looks like a SMI.
    ASSERT(implicit_args[v8::Arguments::kIsolateIndex]->IsSmi());

    return v8::Arguments(implicit_args, argv, argc, is_construct_call);
  }

  // Introduce an alias for the handle scope data to allow non-friends
  // to access the HandleScope data.
  typedef v8::HandleScope::Data HandleScopeData;

#ifdef DEBUG
  static void ZapHandleRange(internal::Object** begin, internal::Object** end);
#endif
};

}  // namespace v8

#endif  // V8_APIUTILS_H_