1/*
2 * Copyright (C) 2016-2019 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "JSWebAssemblyTable.h"
28
29#if ENABLE(WEBASSEMBLY)
30
31#include "JSCInlines.h"
32#include "JSWebAssemblyInstance.h"
33#include <wtf/CheckedArithmetic.h>
34
35namespace JSC {
36
37const ClassInfo JSWebAssemblyTable::s_info = { "WebAssembly.Table", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSWebAssemblyTable) };
38
39JSWebAssemblyTable* JSWebAssemblyTable::create(ExecState* exec, VM& vm, Structure* structure, Ref<Wasm::Table>&& table)
40{
41 auto throwScope = DECLARE_THROW_SCOPE(vm);
42 auto* globalObject = exec->lexicalGlobalObject();
43
44 if (!globalObject->webAssemblyEnabled()) {
45 throwException(exec, throwScope, createEvalError(exec, globalObject->webAssemblyDisabledErrorMessage()));
46 return nullptr;
47 }
48
49 auto* instance = new (NotNull, allocateCell<JSWebAssemblyTable>(vm.heap)) JSWebAssemblyTable(vm, structure, WTFMove(table));
50 instance->finishCreation(vm);
51 return instance;
52}
53
54Structure* JSWebAssemblyTable::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
55{
56 return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
57}
58
59JSWebAssemblyTable::JSWebAssemblyTable(VM& vm, Structure* structure, Ref<Wasm::Table>&& table)
60 : Base(vm, structure)
61 , m_table(WTFMove(table))
62{
63 // FIXME: It might be worth trying to pre-allocate maximum here. The spec recommends doing so.
64 // But for now, we're not doing that.
65 // FIXME this over-allocates and could be smarter about not committing all of that memory https://bugs.webkit.org/show_bug.cgi?id=181425
66 m_jsFunctions = MallocPtr<WriteBarrier<JSObject>>::malloc((sizeof(WriteBarrier<JSObject>) * Checked<size_t>(allocatedLength())).unsafeGet());
67 for (uint32_t i = 0; i < allocatedLength(); ++i)
68 new(&m_jsFunctions.get()[i]) WriteBarrier<JSObject>();
69}
70
71void JSWebAssemblyTable::finishCreation(VM& vm)
72{
73 Base::finishCreation(vm);
74 ASSERT(inherits(vm, info()));
75}
76
77void JSWebAssemblyTable::destroy(JSCell* cell)
78{
79 static_cast<JSWebAssemblyTable*>(cell)->JSWebAssemblyTable::~JSWebAssemblyTable();
80}
81
82void JSWebAssemblyTable::visitChildren(JSCell* cell, SlotVisitor& visitor)
83{
84 JSWebAssemblyTable* thisObject = jsCast<JSWebAssemblyTable*>(cell);
85 ASSERT_GC_OBJECT_INHERITS(thisObject, info());
86
87 Base::visitChildren(thisObject, visitor);
88
89 for (unsigned i = 0; i < thisObject->length(); ++i)
90 visitor.append(thisObject->m_jsFunctions.get()[i]);
91}
92
93bool JSWebAssemblyTable::grow(uint32_t delta)
94{
95 if (delta == 0)
96 return true;
97
98 size_t oldLength = length();
99
100 auto grew = m_table->grow(delta);
101 if (!grew)
102 return false;
103
104 size_t newLength = grew.value();
105 if (newLength > m_table->allocatedLength(oldLength))
106 // FIXME this over-allocates and could be smarter about not committing all of that memory https://bugs.webkit.org/show_bug.cgi?id=181425
107 m_jsFunctions.realloc((sizeof(WriteBarrier<JSObject>) * Checked<size_t>(m_table->allocatedLength(newLength))).unsafeGet());
108
109 for (size_t i = oldLength; i < m_table->allocatedLength(newLength); ++i)
110 new (&m_jsFunctions.get()[i]) WriteBarrier<JSObject>();
111
112 return true;
113}
114
115JSObject* JSWebAssemblyTable::getFunction(uint32_t index)
116{
117 RELEASE_ASSERT(index < length());
118 return m_jsFunctions.get()[index & m_table->mask()].get();
119}
120
121void JSWebAssemblyTable::clearFunction(uint32_t index)
122{
123 m_table->clearFunction(index);
124 m_jsFunctions.get()[index & m_table->mask()] = WriteBarrier<JSObject>();
125}
126
127void JSWebAssemblyTable::setFunction(VM& vm, uint32_t index, WebAssemblyFunction* function)
128{
129 m_table->setFunction(index, function->importableFunction(), &function->instance()->instance());
130 m_jsFunctions.get()[index & m_table->mask()].set(vm, this, function);
131}
132
133void JSWebAssemblyTable::setFunction(VM& vm, uint32_t index, WebAssemblyWrapperFunction* function)
134{
135 m_table->setFunction(index, function->importableFunction(), &function->instance()->instance());
136 m_jsFunctions.get()[index & m_table->mask()].set(vm, this, function);
137}
138
139} // namespace JSC
140
141#endif // ENABLE(WEBASSEMBLY)
142