1// Copyright 2009 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
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11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28#ifndef V8_APIUTILS_H_
29#define V8_APIUTILS_H_
30
31namespace v8 {
32class ImplementationUtilities {
33 public:
34  static int GetNameCount(ExtensionConfiguration* that) {
35    return that->name_count_;
36  }
37
38  static const char** GetNames(ExtensionConfiguration* that) {
39    return that->names_;
40  }
41
42  // Packs additional parameters for the NewArguments function. |implicit_args|
43  // is a pointer to the last element of 3-elements array controlled by GC.
44  static void PrepareArgumentsData(internal::Object** implicit_args,
45                                   internal::Object* data,
46                                   internal::JSFunction* callee,
47                                   internal::Object* holder) {
48    implicit_args[v8::Arguments::kDataIndex] = data;
49    implicit_args[v8::Arguments::kCalleeIndex] = callee;
50    implicit_args[v8::Arguments::kHolderIndex] = holder;
51  }
52
53  static v8::Arguments NewArguments(internal::Object** implicit_args,
54                                    internal::Object** argv, int argc,
55                                    bool is_construct_call) {
56    ASSERT(implicit_args[v8::Arguments::kCalleeIndex]->IsJSFunction());
57    ASSERT(implicit_args[v8::Arguments::kHolderIndex]->IsHeapObject());
58
59    return v8::Arguments(implicit_args, argv, argc, is_construct_call);
60  }
61
62  // Introduce an alias for the handle scope data to allow non-friends
63  // to access the HandleScope data.
64  typedef v8::HandleScope::Data HandleScopeData;
65
66#ifdef DEBUG
67  static void ZapHandleRange(internal::Object** begin, internal::Object** end);
68#endif
69};
70
71}  // namespace v8
72
73#endif  // V8_APIUTILS_H_
74