bootstrapper.h revision 3100271588b61cbc1dc472a3f2f105d2eed8497f 
1// Copyright 2006-2008 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
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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
29#ifndef V8_BOOTSTRAPPER_H_
30#define V8_BOOTSTRAPPER_H_
31
32namespace v8 {
33namespace internal {
34
35
36class BootstrapperActive BASE_EMBEDDED {
37 public:
38  BootstrapperActive() { nesting_++; }
39  ~BootstrapperActive() { nesting_--; }
40
41  // Support for thread preemption.
42  static int ArchiveSpacePerThread();
43  static char* ArchiveState(char* to);
44  static char* RestoreState(char* from);
45
46 private:
47  static bool IsActive() { return nesting_ != 0; }
48  static int nesting_;
49  friend class Bootstrapper;
50};
51
52
53// The Boostrapper is the public interface for creating a JavaScript global
54// context.
55class Bootstrapper : public AllStatic {
56 public:
57  // Requires: Heap::Setup has been called.
58  static void Initialize(bool create_heap_objects);
59  static void TearDown();
60
61  // Creates a JavaScript Global Context with initial object graph.
62  // The returned value is a global handle casted to V8Environment*.
63  static Handle<Context> CreateEnvironment(
64      Handle<Object> global_object,
65      v8::Handle<v8::ObjectTemplate> global_template,
66      v8::ExtensionConfiguration* extensions);
67
68  // Detach the environment from its outer global object.
69  static void DetachGlobal(Handle<Context> env);
70
71  // Traverses the pointers for memory management.
72  static void Iterate(ObjectVisitor* v);
73
74  // Accessors for the native scripts cache. Used in lazy loading.
75  static Handle<String> NativesSourceLookup(int index);
76
77  // Append code that needs fixup at the end of boot strapping.
78  static void AddFixup(Code* code, MacroAssembler* masm);
79
80  // Tells whether bootstrapping is active.
81  static bool IsActive() { return BootstrapperActive::IsActive(); }
82
83  // Encoding/decoding support for fixup flags.
84  class FixupFlagsUseCodeObject: public BitField<bool, 0, 1> {};
85  class FixupFlagsArgumentsCount: public BitField<uint32_t, 1, 32-1> {};
86
87  // Support for thread preemption.
88  static int ArchiveSpacePerThread();
89  static char* ArchiveState(char* to);
90  static char* RestoreState(char* from);
91  static void FreeThreadResources();
92
93  // This will allocate a char array that is deleted when V8 is shut down.
94  // It should only be used for strictly finite allocations.
95  static char* AllocateAutoDeletedArray(int bytes);
96
97  // Used for new context creation.
98  static bool InstallExtensions(Handle<Context> global_context,
99                                v8::ExtensionConfiguration* extensions);
100};
101
102
103class NativesExternalStringResource
104    : public v8::String::ExternalAsciiStringResource {
105 public:
106  explicit NativesExternalStringResource(const char* source);
107
108  const char* data() const {
109    return data_;
110  }
111
112  size_t length() const {
113    return length_;
114  }
115 private:
116  const char* data_;
117  size_t length_;
118};
119
120}}  // namespace v8::internal
121
122#endif  // V8_BOOTSTRAPPER_H_
123