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
|
/*
* 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_V8_DOM_WRAPPER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_DOM_WRAPPER_H_
#include "third_party/blink/renderer/platform/bindings/dom_data_store.h"
#include "third_party/blink/renderer/platform/bindings/runtime_call_stats.h"
#include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
#include "third_party/blink/renderer/platform/bindings/v8_binding.h"
#include "third_party/blink/renderer/platform/bindings/wrapper_creation_security_check.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/compiler.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"
#include "v8/include/v8.h"
namespace blink {
struct WrapperTypeInfo;
// Contains utility methods to create wrappers, associate ScriptWrappable
// objects with wrappers and set fields in wrappers.
class V8DOMWrapper {
STATIC_ONLY(V8DOMWrapper);
public:
PLATFORM_EXPORT static v8::Local<v8::Object> CreateWrapper(
v8::Isolate*,
v8::Local<v8::Object> creation_context,
const WrapperTypeInfo*);
PLATFORM_EXPORT static bool IsWrapper(v8::Isolate*, v8::Local<v8::Value>);
// Associates the given ScriptWrappable with the given |wrapper| if the
// ScriptWrappable is not yet associated with any wrapper. Returns the
// wrapper already associated or |wrapper| if not yet associated.
// The caller should always use the returned value rather than |wrapper|.
PLATFORM_EXPORT WARN_UNUSED_RESULT static v8::Local<v8::Object>
AssociateObjectWithWrapper(v8::Isolate*,
ScriptWrappable*,
const WrapperTypeInfo*,
v8::Local<v8::Object> wrapper);
static void SetNativeInfo(v8::Isolate*,
v8::Local<v8::Object>,
const WrapperTypeInfo*,
ScriptWrappable*);
static void ClearNativeInfo(v8::Isolate*, v8::Local<v8::Object>);
// hasInternalFieldsSet only checks if the value has the internal fields for
// wrapper obejct and type, and does not check if it's valid or not. The
// value may not be a Blink's wrapper object. In order to make sure of it,
// Use isWrapper function instead.
PLATFORM_EXPORT static bool HasInternalFieldsSet(v8::Local<v8::Value>);
};
inline void V8DOMWrapper::SetNativeInfo(
v8::Isolate* isolate,
v8::Local<v8::Object> wrapper,
const WrapperTypeInfo* wrapper_type_info,
ScriptWrappable* script_wrappable) {
DCHECK_GE(wrapper->InternalFieldCount(), 2);
DCHECK(script_wrappable);
DCHECK(wrapper_type_info);
int indices[] = {kV8DOMWrapperObjectIndex, kV8DOMWrapperTypeIndex};
void* values[] = {script_wrappable,
const_cast<WrapperTypeInfo*>(wrapper_type_info)};
wrapper->SetAlignedPointerInInternalFields(WTF_ARRAY_LENGTH(indices), indices,
values);
auto* per_isolate_data = V8PerIsolateData::From(isolate);
// We notify ScriptWrappableVisitor about the new wrapper association,
// so the visitor can make sure to trace the association (in case it is
// currently tracing). Because of some optimizations, V8 will not
// necessarily detect wrappers created during its incremental marking.
per_isolate_data->GetScriptWrappableMarkingVisitor()->RegisterV8Reference(
std::make_pair(const_cast<WrapperTypeInfo*>(wrapper_type_info),
script_wrappable));
}
inline void V8DOMWrapper::ClearNativeInfo(v8::Isolate* isolate,
v8::Local<v8::Object> wrapper) {
int indices[] = {kV8DOMWrapperObjectIndex, kV8DOMWrapperTypeIndex};
void* values[] = {nullptr, nullptr};
wrapper->SetAlignedPointerInInternalFields(WTF_ARRAY_LENGTH(indices), indices,
values);
}
inline v8::Local<v8::Object> V8DOMWrapper::AssociateObjectWithWrapper(
v8::Isolate* isolate,
ScriptWrappable* impl,
const WrapperTypeInfo* wrapper_type_info,
v8::Local<v8::Object> wrapper) {
RUNTIME_CALL_TIMER_SCOPE(
isolate, RuntimeCallStats::CounterId::kAssociateObjectWithWrapper);
if (DOMDataStore::SetWrapper(isolate, impl, wrapper_type_info, wrapper)) {
WrapperTypeInfo::WrapperCreated();
SetNativeInfo(isolate, wrapper, wrapper_type_info, impl);
DCHECK(HasInternalFieldsSet(wrapper));
}
SECURITY_CHECK(ToScriptWrappable(wrapper) == impl);
return wrapper;
}
class V8WrapperInstantiationScope {
STACK_ALLOCATED();
public:
V8WrapperInstantiationScope(v8::Local<v8::Object> creation_context,
v8::Isolate* isolate,
const WrapperTypeInfo* type)
: did_enter_context_(false),
context_(isolate->GetCurrentContext()),
try_catch_(isolate),
type_(type),
access_check_failed_(false) {
// creationContext should not be empty. Because if we have an
// empty creationContext, we will end up creating
// a new object in the context currently entered. This is wrong.
CHECK(!creation_context.IsEmpty());
v8::Local<v8::Context> context_for_wrapper =
creation_context->CreationContext();
// For performance, we enter the context only if the currently running
// context is different from the context that we are about to enter.
if (context_for_wrapper == context_)
return;
context_ = context_for_wrapper;
if (!WrapperCreationSecurityCheck::VerifyContextAccess(context_, type_)) {
DCHECK(try_catch_.HasCaught());
try_catch_.ReThrow();
access_check_failed_ = true;
return;
}
did_enter_context_ = true;
context_->Enter();
}
~V8WrapperInstantiationScope() {
if (!did_enter_context_) {
try_catch_.ReThrow();
return;
}
context_->Exit();
if (access_check_failed_ || !try_catch_.HasCaught())
return;
// Any exception caught here is a cross context exception and it may not be
// safe to directly rethrow the exception in the current context (without
// converting it). rethrowCrossContextException converts the exception in
// such a scenario.
v8::Local<v8::Value> caught_exception = try_catch_.Exception();
try_catch_.Reset();
WrapperCreationSecurityCheck::RethrowCrossContextException(
context_, type_, caught_exception);
try_catch_.ReThrow();
}
v8::Local<v8::Context> GetContext() const { return context_; }
bool AccessCheckFailed() const { return access_check_failed_; }
private:
bool did_enter_context_;
v8::Local<v8::Context> context_;
v8::TryCatch try_catch_;
const WrapperTypeInfo* type_;
bool access_check_failed_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_DOM_WRAPPER_H_
|
