1/*
2 * Copyright (C) 2016-2018 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 "WebAssemblyMemoryConstructor.h"
28
29#if ENABLE(WEBASSEMBLY)
30
31#include "FunctionPrototype.h"
32#include "JSCInlines.h"
33#include "JSWebAssemblyHelpers.h"
34#include "JSWebAssemblyMemory.h"
35#include "WasmMemory.h"
36#include "WasmPageCount.h"
37#include "WebAssemblyMemoryPrototype.h"
38#include <wtf/Optional.h>
39
40#include "WebAssemblyMemoryConstructor.lut.h"
41
42namespace JSC {
43
44const ClassInfo WebAssemblyMemoryConstructor::s_info = { "Function", &Base::s_info, &constructorTableWebAssemblyMemory, nullptr, CREATE_METHOD_TABLE(WebAssemblyMemoryConstructor) };
45
46/* Source for WebAssemblyMemoryConstructor.lut.h
47 @begin constructorTableWebAssemblyMemory
48 @end
49 */
50
51static EncodedJSValue JSC_HOST_CALL constructJSWebAssemblyMemory(ExecState* exec)
52{
53 VM& vm = exec->vm();
54 auto throwScope = DECLARE_THROW_SCOPE(vm);
55 if (exec->argumentCount() != 1)
56 return JSValue::encode(throwException(exec, throwScope, createTypeError(exec, "WebAssembly.Memory expects exactly one argument"_s)));
57
58 JSObject* memoryDescriptor;
59 {
60 JSValue argument = exec->argument(0);
61 if (!argument.isObject())
62 return JSValue::encode(throwException(exec, throwScope, createTypeError(exec, "WebAssembly.Memory expects its first argument to be an object"_s)));
63 memoryDescriptor = jsCast<JSObject*>(argument);
64 }
65
66 Wasm::PageCount initialPageCount;
67 {
68 Identifier initial = Identifier::fromString(&vm, "initial");
69 JSValue minSizeValue = memoryDescriptor->get(exec, initial);
70 RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
71 uint32_t size = toNonWrappingUint32(exec, minSizeValue);
72 RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
73 if (!Wasm::PageCount::isValid(size))
74 return JSValue::encode(throwException(exec, throwScope, createRangeError(exec, "WebAssembly.Memory 'initial' page count is too large"_s)));
75 if (Wasm::PageCount(size).bytes() > MAX_ARRAY_BUFFER_SIZE)
76 return JSValue::encode(throwException(exec, throwScope, createOutOfMemoryError(exec)));
77 initialPageCount = Wasm::PageCount(size);
78 }
79
80 Wasm::PageCount maximumPageCount;
81 {
82 Identifier maximum = Identifier::fromString(&vm, "maximum");
83 bool hasProperty = memoryDescriptor->hasProperty(exec, maximum);
84 RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
85 if (hasProperty) {
86 JSValue maxSizeValue = memoryDescriptor->get(exec, maximum);
87 RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
88 uint32_t size = toNonWrappingUint32(exec, maxSizeValue);
89 RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
90 if (!Wasm::PageCount::isValid(size))
91 return JSValue::encode(throwException(exec, throwScope, createRangeError(exec, "WebAssembly.Memory 'maximum' page count is too large"_s)));
92 maximumPageCount = Wasm::PageCount(size);
93
94 if (initialPageCount > maximumPageCount) {
95 return JSValue::encode(throwException(exec, throwScope,
96 createRangeError(exec, "'maximum' page count must be than greater than or equal to the 'initial' page count"_s)));
97 }
98 }
99 }
100
101 auto* jsMemory = JSWebAssemblyMemory::create(exec, vm, exec->lexicalGlobalObject()->webAssemblyMemoryStructure());
102 RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
103
104 RefPtr<Wasm::Memory> memory = Wasm::Memory::tryCreate(initialPageCount, maximumPageCount,
105 [&vm] (Wasm::Memory::NotifyPressure) { vm.heap.collectAsync(CollectionScope::Full); },
106 [&vm] (Wasm::Memory::SyncTryToReclaim) { vm.heap.collectSync(CollectionScope::Full); },
107 [&vm, jsMemory] (Wasm::Memory::GrowSuccess, Wasm::PageCount oldPageCount, Wasm::PageCount newPageCount) { jsMemory->growSuccessCallback(vm, oldPageCount, newPageCount); });
108 if (!memory)
109 return JSValue::encode(throwException(exec, throwScope, createOutOfMemoryError(exec)));
110
111 jsMemory->adopt(memory.releaseNonNull());
112
113 return JSValue::encode(jsMemory);
114}
115
116static EncodedJSValue JSC_HOST_CALL callJSWebAssemblyMemory(ExecState* exec)
117{
118 VM& vm = exec->vm();
119 auto throwScope = DECLARE_THROW_SCOPE(vm);
120 return JSValue::encode(throwConstructorCannotBeCalledAsFunctionTypeError(exec, throwScope, "WebAssembly.Memory"));
121}
122
123WebAssemblyMemoryConstructor* WebAssemblyMemoryConstructor::create(VM& vm, Structure* structure, WebAssemblyMemoryPrototype* thisPrototype)
124{
125 auto* constructor = new (NotNull, allocateCell<WebAssemblyMemoryConstructor>(vm.heap)) WebAssemblyMemoryConstructor(vm, structure);
126 constructor->finishCreation(vm, thisPrototype);
127 return constructor;
128}
129
130Structure* WebAssemblyMemoryConstructor::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
131{
132 return Structure::create(vm, globalObject, prototype, TypeInfo(InternalFunctionType, StructureFlags), info());
133}
134
135void WebAssemblyMemoryConstructor::finishCreation(VM& vm, WebAssemblyMemoryPrototype* prototype)
136{
137 Base::finishCreation(vm, "Memory"_s, NameVisibility::Visible, NameAdditionMode::WithoutStructureTransition);
138 putDirectWithoutTransition(vm, vm.propertyNames->prototype, prototype, PropertyAttribute::DontEnum | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly);
139 putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(1), PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum | PropertyAttribute::DontDelete);
140}
141
142WebAssemblyMemoryConstructor::WebAssemblyMemoryConstructor(VM& vm, Structure* structure)
143 : Base(vm, structure, callJSWebAssemblyMemory, constructJSWebAssemblyMemory)
144{
145}
146
147} // namespace JSC
148
149#endif // ENABLE(WEBASSEMBLY)
150
151