bootstrapper.h revision e46be819fca9468a0cd4e74859ce0f778eb8ca60 
1// Copyright 2006-2008 the V8 project authors. All rights reserved.
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3// modification, are permitted provided that the following conditions are
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5//
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15//
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27
28
29#ifndef V8_BOOTSTRAPPER_H_
30#define V8_BOOTSTRAPPER_H_
31
32namespace v8 {
33namespace internal {
34
35// The Boostrapper is the public interface for creating a JavaScript global
36// context.
37class Bootstrapper : public AllStatic {
38 public:
39  // Requires: Heap::Setup has been called.
40  static void Initialize(bool create_heap_objects);
41  static void TearDown();
42
43  // Creates a JavaScript Global Context with initial object graph.
44  // The returned value is a global handle casted to V8Environment*.
45  static Handle<Context> CreateEnvironment(
46      Handle<Object> global_object,
47      v8::Handle<v8::ObjectTemplate> global_template,
48      v8::ExtensionConfiguration* extensions);
49
50  // Detach the environment from its outer global object.
51  static void DetachGlobal(Handle<Context> env);
52
53  // Traverses the pointers for memory management.
54  static void Iterate(ObjectVisitor* v);
55
56  // Accessors for the native scripts cache. Used in lazy loading.
57  static Handle<String> NativesSourceLookup(int index);
58  static bool NativesCacheLookup(Vector<const char> name,
59                                 Handle<JSFunction>* handle);
60  static void NativesCacheAdd(Vector<const char> name, Handle<JSFunction> fun);
61
62  // Append code that needs fixup at the end of boot strapping.
63  static void AddFixup(Code* code, MacroAssembler* masm);
64
65  // Tells whether bootstrapping is active.
66  static bool IsActive();
67
68  // Encoding/decoding support for fixup flags.
69  class FixupFlagsUseCodeObject: public BitField<bool, 0, 1> {};
70  class FixupFlagsArgumentsCount: public BitField<uint32_t, 1, 32-1> {};
71
72  // Support for thread preemption.
73  static int ArchiveSpacePerThread();
74  static char* ArchiveState(char* to);
75  static char* RestoreState(char* from);
76  static void FreeThreadResources();
77
78  // This will allocate a char array that is deleted when V8 is shut down.
79  // It should only be used for strictly finite allocations.
80  static char* AllocateAutoDeletedArray(int bytes);
81};
82
83
84class NativesExternalStringResource
85    : public v8::String::ExternalAsciiStringResource {
86 public:
87  explicit NativesExternalStringResource(const char* source);
88
89  const char* data() const {
90    return data_;
91  }
92
93  size_t length() const {
94    return length_;
95  }
96 private:
97  const char* data_;
98  size_t length_;
99};
100
101}}  // namespace v8::internal
102
103#endif  // V8_BOOTSTRAPPER_H_
104