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
|
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/typed_arrays/dom_array_buffer.h"
#include <algorithm>
#include "base/memory/scoped_refptr.h"
#include "third_party/blink/renderer/platform/bindings/dom_data_store.h"
#include "third_party/blink/renderer/platform/bindings/dom_wrapper_world.h"
#include "third_party/blink/renderer/platform/wtf/shared_buffer.h"
namespace blink {
// Construction of WrapperTypeInfo may require non-trivial initialization due
// to cross-component address resolution in order to load the pointer to the
// parent interface's WrapperTypeInfo. We ignore this issue because the issue
// happens only on component builds and the official release builds
// (statically-linked builds) are never affected by this issue.
#if defined(COMPONENT_BUILD) && defined(WIN32) && defined(__clang__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wglobal-constructors"
#endif
const WrapperTypeInfo DOMArrayBuffer::wrapper_type_info_body_{
gin::kEmbedderBlink,
nullptr,
nullptr,
"ArrayBuffer",
nullptr,
WrapperTypeInfo::kWrapperTypeObjectPrototype,
WrapperTypeInfo::kObjectClassId,
WrapperTypeInfo::kNotInheritFromActiveScriptWrappable,
WrapperTypeInfo::kIdlBufferSourceType,
};
const WrapperTypeInfo& DOMArrayBuffer::wrapper_type_info_ =
DOMArrayBuffer::wrapper_type_info_body_;
#if defined(COMPONENT_BUILD) && defined(WIN32) && defined(__clang__)
#pragma clang diagnostic pop
#endif
static void AccumulateArrayBuffersForAllWorlds(
v8::Isolate* isolate,
DOMArrayBuffer* object,
Vector<v8::Local<v8::ArrayBuffer>, 4>& buffers) {
Vector<scoped_refptr<DOMWrapperWorld>> worlds;
DOMWrapperWorld::AllWorldsInCurrentThread(worlds);
for (const auto& world : worlds) {
v8::Local<v8::Object> wrapper = world->DomDataStore().Get(object, isolate);
if (!wrapper.IsEmpty())
buffers.push_back(v8::Local<v8::ArrayBuffer>::Cast(wrapper));
}
}
bool DOMArrayBuffer::IsDetachable(v8::Isolate* isolate) {
Vector<v8::Local<v8::ArrayBuffer>, 4> buffer_handles;
v8::HandleScope handle_scope(isolate);
AccumulateArrayBuffersForAllWorlds(isolate, this, buffer_handles);
bool is_detachable = true;
for (const auto& buffer_handle : buffer_handles)
is_detachable &= buffer_handle->IsDetachable();
return is_detachable;
}
bool DOMArrayBuffer::Transfer(v8::Isolate* isolate,
ArrayBufferContents& result) {
DOMArrayBuffer* to_transfer = this;
if (!IsDetachable(isolate)) {
to_transfer = DOMArrayBuffer::Create(Content()->Data(), ByteLength());
}
return to_transfer->TransferDetachable(isolate, result);
}
bool DOMArrayBuffer::TransferDetachable(v8::Isolate* isolate,
ArrayBufferContents& result) {
DCHECK(IsDetachable(isolate));
if (IsDetached()) {
result.Detach();
return false;
}
if (!Content()->Data()) {
// We transfer an empty ArrayBuffer, we can just allocate an empty content.
result = ArrayBufferContents(Content()->BackingStore());
} else {
Content()->Transfer(result);
Detach();
}
Vector<v8::Local<v8::ArrayBuffer>, 4> buffer_handles;
v8::HandleScope handle_scope(isolate);
AccumulateArrayBuffersForAllWorlds(isolate, this, buffer_handles);
for (const auto& buffer_handle : buffer_handles)
buffer_handle->Detach();
return true;
}
DOMArrayBuffer* DOMArrayBuffer::CreateOrNull(size_t num_elements,
size_t element_byte_size) {
ArrayBufferContents contents(num_elements, element_byte_size,
ArrayBufferContents::kNotShared,
ArrayBufferContents::kZeroInitialize);
if (!contents.Data()) {
return nullptr;
}
return Create(std::move(contents));
}
DOMArrayBuffer* DOMArrayBuffer::CreateUninitializedOrNull(
size_t num_elements,
size_t element_byte_size) {
ArrayBufferContents contents(num_elements, element_byte_size,
ArrayBufferContents::kNotShared,
ArrayBufferContents::kDontInitialize);
if (!contents.Data()) {
return nullptr;
}
return Create(std::move(contents));
}
v8::MaybeLocal<v8::Value> DOMArrayBuffer::Wrap(ScriptState* script_state) {
DCHECK(!DOMDataStore::ContainsWrapper(this, script_state->GetIsolate()));
const WrapperTypeInfo* wrapper_type_info = GetWrapperTypeInfo();
v8::Local<v8::ArrayBuffer> wrapper;
{
v8::Context::Scope context_scope(script_state->GetContext());
wrapper = v8::ArrayBuffer::New(script_state->GetIsolate(),
Content()->BackingStore());
}
return AssociateWithWrapper(script_state->GetIsolate(), wrapper_type_info,
wrapper);
}
DOMArrayBuffer* DOMArrayBuffer::Create(
scoped_refptr<SharedBuffer> shared_buffer) {
ArrayBufferContents contents(shared_buffer->size(), 1,
ArrayBufferContents::kNotShared,
ArrayBufferContents::kDontInitialize);
uint8_t* data = static_cast<uint8_t*>(contents.Data());
if (UNLIKELY(!data))
OOM_CRASH(shared_buffer->size());
for (const auto& span : *shared_buffer) {
memcpy(data, span.data(), span.size());
data += span.size();
}
return Create(std::move(contents));
}
DOMArrayBuffer* DOMArrayBuffer::Create(
const Vector<base::span<const char>>& data) {
size_t size = 0;
for (const auto& span : data) {
size += span.size();
}
ArrayBufferContents contents(size, 1, ArrayBufferContents::kNotShared,
ArrayBufferContents::kDontInitialize);
uint8_t* ptr = static_cast<uint8_t*>(contents.Data());
if (UNLIKELY(!ptr))
OOM_CRASH(size);
for (const auto& span : data) {
memcpy(ptr, span.data(), span.size());
ptr += span.size();
}
return Create(std::move(contents));
}
DOMArrayBuffer* DOMArrayBuffer::Slice(size_t begin, size_t end) const {
begin = std::min(begin, ByteLength());
end = std::min(end, ByteLength());
size_t size = begin <= end ? end - begin : 0;
return Create(static_cast<const char*>(Data()) + begin, size);
}
} // namespace blink
|
