1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
// Copyright 2006-2008 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef V8_BOOTSTRAPPER_H_
#define V8_BOOTSTRAPPER_H_
#include "allocation.h"
namespace v8 {
namespace internal {
// A SourceCodeCache uses a FixedArray to store pairs of
// (AsciiString*, JSFunction*), mapping names of native code files
// (runtime.js, etc.) to precompiled functions. Instead of mapping
// names to functions it might make sense to let the JS2C tool
// generate an index for each native JS file.
class SourceCodeCache BASE_EMBEDDED {
public:
explicit SourceCodeCache(Script::Type type): type_(type), cache_(NULL) { }
void Initialize(bool create_heap_objects) {
cache_ = create_heap_objects ? HEAP->empty_fixed_array() : NULL;
}
void Iterate(ObjectVisitor* v) {
v->VisitPointer(BitCast<Object**, FixedArray**>(&cache_));
}
bool Lookup(Vector<const char> name, Handle<SharedFunctionInfo>* handle) {
for (int i = 0; i < cache_->length(); i+=2) {
SeqAsciiString* str = SeqAsciiString::cast(cache_->get(i));
if (str->IsEqualTo(name)) {
*handle = Handle<SharedFunctionInfo>(
SharedFunctionInfo::cast(cache_->get(i + 1)));
return true;
}
}
return false;
}
void Add(Vector<const char> name, Handle<SharedFunctionInfo> shared) {
HandleScope scope;
int length = cache_->length();
Handle<FixedArray> new_array =
FACTORY->NewFixedArray(length + 2, TENURED);
cache_->CopyTo(0, *new_array, 0, cache_->length());
cache_ = *new_array;
Handle<String> str = FACTORY->NewStringFromAscii(name, TENURED);
cache_->set(length, *str);
cache_->set(length + 1, *shared);
Script::cast(shared->script())->set_type(Smi::FromInt(type_));
}
private:
Script::Type type_;
FixedArray* cache_;
DISALLOW_COPY_AND_ASSIGN(SourceCodeCache);
};
// The Boostrapper is the public interface for creating a JavaScript global
// context.
class Bootstrapper {
public:
// Requires: Heap::SetUp has been called.
void Initialize(bool create_heap_objects);
void TearDown();
// Creates a JavaScript Global Context with initial object graph.
// The returned value is a global handle casted to V8Environment*.
Handle<Context> CreateEnvironment(
Isolate* isolate,
Handle<Object> global_object,
v8::Handle<v8::ObjectTemplate> global_template,
v8::ExtensionConfiguration* extensions);
// Detach the environment from its outer global object.
void DetachGlobal(Handle<Context> env);
// Reattach an outer global object to an environment.
void ReattachGlobal(Handle<Context> env, Handle<Object> global_object);
// Traverses the pointers for memory management.
void Iterate(ObjectVisitor* v);
// Accessor for the native scripts source code.
Handle<String> NativesSourceLookup(int index);
// Tells whether bootstrapping is active.
bool IsActive() const { return nesting_ != 0; }
// Support for thread preemption.
static int ArchiveSpacePerThread();
char* ArchiveState(char* to);
char* RestoreState(char* from);
void FreeThreadResources();
// This will allocate a char array that is deleted when V8 is shut down.
// It should only be used for strictly finite allocations.
char* AllocateAutoDeletedArray(int bytes);
// Used for new context creation.
bool InstallExtensions(Handle<Context> global_context,
v8::ExtensionConfiguration* extensions);
SourceCodeCache* extensions_cache() { return &extensions_cache_; }
private:
typedef int NestingCounterType;
NestingCounterType nesting_;
SourceCodeCache extensions_cache_;
// This is for delete, not delete[].
List<char*>* delete_these_non_arrays_on_tear_down_;
// This is for delete[]
List<char*>* delete_these_arrays_on_tear_down_;
friend class BootstrapperActive;
friend class Isolate;
friend class NativesExternalStringResource;
Bootstrapper();
DISALLOW_COPY_AND_ASSIGN(Bootstrapper);
};
class BootstrapperActive BASE_EMBEDDED {
public:
BootstrapperActive() {
++Isolate::Current()->bootstrapper()->nesting_;
}
~BootstrapperActive() {
--Isolate::Current()->bootstrapper()->nesting_;
}
private:
DISALLOW_COPY_AND_ASSIGN(BootstrapperActive);
};
class NativesExternalStringResource
: public v8::String::ExternalAsciiStringResource {
public:
NativesExternalStringResource(Bootstrapper* bootstrapper,
const char* source,
size_t length);
const char* data() const {
return data_;
}
size_t length() const {
return length_;
}
private:
const char* data_;
size_t length_;
};
}} // namespace v8::internal
#endif // V8_BOOTSTRAPPER_H_
|
