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
|
/*
* Copyright (C) 2016 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
*/
#include "config.h"
#include "JSWebAssemblyMemory.h"
#if ENABLE(WEBASSEMBLY)
#include "JSCInlines.h"
#include "ArrayBuffer.h"
#include "JSArrayBuffer.h"
namespace JSC {
const ClassInfo JSWebAssemblyMemory::s_info = { "WebAssembly.Memory", &Base::s_info, 0, CREATE_METHOD_TABLE(JSWebAssemblyMemory) };
JSWebAssemblyMemory* JSWebAssemblyMemory::create(VM& vm, Structure* structure, Wasm::Memory&& memory)
{
auto* instance = new (NotNull, allocateCell<JSWebAssemblyMemory>(vm.heap)) JSWebAssemblyMemory(vm, structure, std::forward<Wasm::Memory>(memory));
instance->finishCreation(vm);
return instance;
}
Structure* JSWebAssemblyMemory::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
}
JSWebAssemblyMemory::JSWebAssemblyMemory(VM& vm, Structure* structure, Wasm::Memory&& memory)
: Base(vm, structure)
, m_memory(WTFMove(memory))
{
}
JSArrayBuffer* JSWebAssemblyMemory::buffer(VM& vm, JSGlobalObject* globalObject)
{
if (m_bufferWrapper)
return m_bufferWrapper.get();
auto destructor = [] (void*) {
// We don't need to do anything here to destroy the memory.
// The ArrayBuffer backing the JSArrayBuffer is only owned by us,
// so we guarantee its lifecycle.
};
m_buffer = ArrayBuffer::createFromBytes(memory()->memory(), memory()->size(), WTFMove(destructor));
m_bufferWrapper.set(vm, this, JSArrayBuffer::create(vm, globalObject->m_arrayBufferStructure.get(), m_buffer.get()));
RELEASE_ASSERT(m_bufferWrapper);
return m_bufferWrapper.get();
}
Wasm::PageCount JSWebAssemblyMemory::grow(ExecState* exec, uint32_t delta, bool shouldThrowExceptionsOnFailure)
{
VM& vm = exec->vm();
auto throwScope = DECLARE_THROW_SCOPE(vm);
Wasm::PageCount oldPageCount = memory()->sizeInPages();
if (!Wasm::PageCount::isValid(delta)) {
if (shouldThrowExceptionsOnFailure)
throwException(exec, throwScope, createRangeError(exec, ASCIILiteral("WebAssembly.Memory.grow expects the delta to be a valid page count")));
return Wasm::PageCount();
}
Wasm::PageCount newSize = oldPageCount + Wasm::PageCount(delta);
if (!newSize) {
if (shouldThrowExceptionsOnFailure)
throwException(exec, throwScope, createRangeError(exec, ASCIILiteral("WebAssembly.Memory.grow expects the grown size to be a valid page count")));
return Wasm::PageCount();
}
if (delta) {
bool success = memory()->grow(newSize);
if (!success) {
if (shouldThrowExceptionsOnFailure)
throwException(exec, throwScope, createOutOfMemoryError(exec));
return Wasm::PageCount();
}
}
// We need to clear out the old array buffer because it might now be pointing
// to stale memory.
// Neuter the old array.
if (m_buffer) {
ArrayBufferContents dummyContents;
m_buffer->transferTo(vm, dummyContents);
m_buffer = nullptr;
m_bufferWrapper.clear();
}
return oldPageCount;
}
void JSWebAssemblyMemory::finishCreation(VM& vm)
{
Base::finishCreation(vm);
ASSERT(inherits(vm, info()));
}
void JSWebAssemblyMemory::destroy(JSCell* cell)
{
auto memory = static_cast<JSWebAssemblyMemory*>(cell);
ASSERT(memory->classInfo() == info());
VM& vm = *memory->vm();
if (memory->m_buffer) {
ArrayBufferContents dummyContents;
memory->m_buffer->transferTo(vm, dummyContents);
memory->m_buffer = nullptr;
}
memory->JSWebAssemblyMemory::~JSWebAssemblyMemory();
}
void JSWebAssemblyMemory::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
auto* thisObject = jsCast<JSWebAssemblyMemory*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
Base::visitChildren(thisObject, visitor);
visitor.append(thisObject->m_bufferWrapper);
}
} // namespace JSC
#endif // ENABLE(WEBASSEMBLY)
|
