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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
/*
* Copyright (C) 2009 Google Inc. 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_DOM_WRAPPER_WORLD_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_DOM_WRAPPER_WORLD_H_
#include <memory>
#include "base/memory/ptr_util.h"
#include "base/memory/scoped_refptr.h"
#include "third_party/blink/public/platform/web_isolated_world_ids.h"
#include "third_party/blink/renderer/platform/bindings/script_state.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/hash_set.h"
#include "third_party/blink/renderer/platform/wtf/ref_counted.h"
#include "v8/include/v8.h"
namespace blink {
class DOMDataStore;
class DOMObjectHolderBase;
class ScriptWrappable;
class SecurityOrigin;
// This class represent a collection of DOM wrappers for a specific world. This
// is identified by a world id that is a per-thread global identifier (see
// WorldId enum).
class PLATFORM_EXPORT DOMWrapperWorld : public RefCounted<DOMWrapperWorld> {
public:
// Per-thread global identifiers for DOMWrapperWorld.
enum WorldId {
kInvalidWorldId = -1,
kMainWorldId = 0,
kDOMWrapperWorldEmbedderWorldIdLimit =
IsolatedWorldId::kEmbedderWorldIdLimit,
kDOMWrapperWorldIsolatedWorldIdLimit =
IsolatedWorldId::kIsolatedWorldIdLimit,
// Other worlds can use IDs after this. Don't manually pick up an ID from
// this range. generateWorldIdForType() picks it up on behalf of you.
kUnspecifiedWorldIdStart,
};
enum class WorldType {
kMain,
kIsolated,
kInspectorIsolated,
kRegExp,
kTesting,
kForV8ContextSnapshotNonMain,
kWorker,
};
static bool IsIsolatedWorldId(int world_id) {
return DOMWrapperWorld::kMainWorldId < world_id &&
world_id < DOMWrapperWorld::kDOMWrapperWorldIsolatedWorldIdLimit;
}
// Creates a world other than IsolatedWorld. Note this can return nullptr if
// GenerateWorldIdForType fails to allocate a valid id.
static scoped_refptr<DOMWrapperWorld> Create(v8::Isolate*, WorldType);
// Ensures an IsolatedWorld for |worldId|.
static scoped_refptr<DOMWrapperWorld> EnsureIsolatedWorld(v8::Isolate*,
int world_id);
~DOMWrapperWorld();
void Dispose();
// Called from performance-sensitive functions, so we should keep this simple
// and fast as much as possible.
static bool NonMainWorldsExistInMainThread() {
return number_of_non_main_worlds_in_main_thread_;
}
static void AllWorldsInCurrentThread(
Vector<scoped_refptr<DOMWrapperWorld>>& worlds);
// Traces wrappers corresponding to the ScriptWrappable in DOM data stores.
static void Trace(const ScriptWrappable*, Visitor*);
static DOMWrapperWorld& World(v8::Local<v8::Context> context) {
return ScriptState::From(context)->World();
}
static DOMWrapperWorld& Current(v8::Isolate* isolate) {
return World(isolate->GetCurrentContext());
}
static DOMWrapperWorld& MainWorld();
static void SetNonMainWorldHumanReadableName(int world_id, const String&);
String NonMainWorldHumanReadableName();
// Associates an isolated world (see above for description) with a security
// origin. XMLHttpRequest instances used in that world will be considered
// to come from that origin, not the frame's.
static void SetIsolatedWorldSecurityOrigin(int world_id,
scoped_refptr<SecurityOrigin>);
SecurityOrigin* IsolatedWorldSecurityOrigin();
static bool HasWrapperInAnyWorldInMainThread(ScriptWrappable*);
bool IsMainWorld() const { return world_type_ == WorldType::kMain; }
bool IsWorkerWorld() const { return world_type_ == WorldType::kWorker; }
bool IsIsolatedWorld() const {
return world_type_ == WorldType::kIsolated ||
world_type_ == WorldType::kInspectorIsolated;
}
int GetWorldId() const { return world_id_; }
DOMDataStore& DomDataStore() const { return *dom_data_store_; }
template <typename T>
void RegisterDOMObjectHolder(v8::Isolate* isolate,
T* object,
v8::Local<v8::Value> wrapper) {
RegisterDOMObjectHolderInternal(
DOMObjectHolder<T>::Create(isolate, object, wrapper));
}
private:
class DOMObjectHolderBase {
USING_FAST_MALLOC(DOMObjectHolderBase);
public:
DOMObjectHolderBase(v8::Isolate* isolate, v8::Local<v8::Value> wrapper)
: wrapper_(isolate, wrapper), world_(nullptr) {}
virtual ~DOMObjectHolderBase() = default;
DOMWrapperWorld* World() const { return world_; }
void SetWorld(DOMWrapperWorld* world) { world_ = world; }
void SetWeak(v8::WeakCallbackInfo<DOMObjectHolderBase>::Callback callback) {
wrapper_.SetWeak(this, callback);
}
private:
ScopedPersistent<v8::Value> wrapper_;
DOMWrapperWorld* world_;
};
template <typename T>
class DOMObjectHolder : public DOMObjectHolderBase {
public:
static std::unique_ptr<DOMObjectHolder<T>>
Create(v8::Isolate* isolate, T* object, v8::Local<v8::Value> wrapper) {
return base::WrapUnique(new DOMObjectHolder(isolate, object, wrapper));
}
private:
DOMObjectHolder(v8::Isolate* isolate,
T* object,
v8::Local<v8::Value> wrapper)
: DOMObjectHolderBase(isolate, wrapper), object_(object) {}
Persistent<T> object_;
};
DOMWrapperWorld(v8::Isolate*, WorldType, int world_id);
static void WeakCallbackForDOMObjectHolder(
const v8::WeakCallbackInfo<DOMObjectHolderBase>&);
void RegisterDOMObjectHolderInternal(std::unique_ptr<DOMObjectHolderBase>);
void UnregisterDOMObjectHolder(DOMObjectHolderBase*);
static unsigned number_of_non_main_worlds_in_main_thread_;
// Returns an identifier for a given world type. This must not be called for
// WorldType::IsolatedWorld because an identifier for the world is given from
// out of DOMWrapperWorld.
static int GenerateWorldIdForType(WorldType);
// Dissociates all wrappers in all worlds associated with |script_wrappable|.
//
// Do not use this function except for DOMWindow. Only DOMWindow needs to
// dissociate wrappers from the ScriptWrappable because of the following two
// reasons.
//
// Reason 1) Case of the main world
// A DOMWindow may be collected by Blink GC *before* V8 GC collects the
// wrapper because the wrapper object associated with a DOMWindow is a global
// proxy, which remains after navigations. We don't want V8 GC to reset the
// weak persistent handle to a wrapper within the DOMWindow
// (ScriptWrappable::main_world_wrapper_) *after* Blink GC collects the
// DOMWindow because it's use-after-free. Thus, we need to dissociate the
// wrapper in advance.
//
// Reason 2) Case of isolated worlds
// As same, a DOMWindow may be collected before the wrapper gets collected.
// A DOMWrapperMap supports mapping from ScriptWrappable* to v8::Global<T>,
// and we don't want to leave an entry of an already-dead DOMWindow* to the
// persistent handle for the global proxy object, especially considering that
// the address to the already-dead DOMWindow* may be re-used.
friend class DOMWindow;
static void DissociateDOMWindowWrappersInAllWorlds(ScriptWrappable*);
const WorldType world_type_;
const int world_id_;
std::unique_ptr<DOMDataStore> dom_data_store_;
HashSet<std::unique_ptr<DOMObjectHolderBase>> dom_object_holders_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_DOM_WRAPPER_WORLD_H_
|
