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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
10 //       disclaimer in the documentation and/or other materials provided
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
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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,
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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 
31 namespace v8 {
32 class ImplementationUtilities {
33  public:
GetNameCount(ExtensionConfiguration * that)34   static int GetNameCount(ExtensionConfiguration* that) {
35     return that->name_count_;
36   }
37 
GetNames(ExtensionConfiguration * that)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.
PrepareArgumentsData(internal::Object ** implicit_args,internal::Object * data,internal::JSFunction * callee,internal::Object * holder)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 
NewArguments(internal::Object ** implicit_args,internal::Object ** argv,int argc,bool is_construct_call)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