1/*
2 * Copyright (C) 2017 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 "WasmInstance.h"
28
29#if ENABLE(WEBASSEMBLY)
30
31#include "JSCInlines.h"
32#include "JSWebAssemblyInstance.h"
33#include "Register.h"
34#include "WasmModuleInformation.h"
35#include <wtf/CheckedArithmetic.h>
36
37namespace JSC { namespace Wasm {
38
39namespace {
40size_t globalMemoryByteSize(Module& module)
41{
42 return (Checked<size_t>(module.moduleInformation().globals.size()) * sizeof(Register)).unsafeGet();
43}
44}
45
46Instance::Instance(Context* context, Ref<Module>&& module, EntryFrame** pointerToTopEntryFrame, void** pointerToActualStackLimit, StoreTopCallFrameCallback&& storeTopCallFrame)
47 : m_context(context)
48 , m_module(WTFMove(module))
49 , m_globals(MallocPtr<GlobalValue>::malloc(globalMemoryByteSize(m_module.get())))
50 , m_globalsToMark(m_module.get().moduleInformation().globals.size())
51 , m_pointerToTopEntryFrame(pointerToTopEntryFrame)
52 , m_pointerToActualStackLimit(pointerToActualStackLimit)
53 , m_storeTopCallFrame(WTFMove(storeTopCallFrame))
54 , m_numImportFunctions(m_module->moduleInformation().importFunctionCount())
55{
56 for (unsigned i = 0; i < m_numImportFunctions; ++i)
57 new (importFunctionInfo(i)) ImportFunctionInfo();
58 memset(static_cast<void*>(m_globals.get()), 0, globalMemoryByteSize(m_module.get()));
59 for (unsigned i = 0; i < m_module->moduleInformation().globals.size(); ++i) {
60 if (m_module.get().moduleInformation().globals[i].type == Anyref)
61 m_globalsToMark.set(i);
62 }
63}
64
65Ref<Instance> Instance::create(Context* context, Ref<Module>&& module, EntryFrame** pointerToTopEntryFrame, void** pointerToActualStackLimit, StoreTopCallFrameCallback&& storeTopCallFrame)
66{
67 return adoptRef(*new (NotNull, fastMalloc(allocationSize(module->moduleInformation().importFunctionCount()))) Instance(context, WTFMove(module), pointerToTopEntryFrame, pointerToActualStackLimit, WTFMove(storeTopCallFrame)));
68}
69
70Instance::~Instance() { }
71
72size_t Instance::extraMemoryAllocated() const
73{
74 return globalMemoryByteSize(m_module.get()) + allocationSize(m_numImportFunctions);
75}
76
77void Instance::setGlobal(unsigned i, JSValue value)
78{
79 ASSERT(m_owner);
80 m_globals.get()[i].anyref.set(*owner<JSWebAssemblyInstance>()->vm(), owner<JSWebAssemblyInstance>(), value);
81}
82
83} } // namespace JSC::Wasm
84
85#endif // ENABLE(WEBASSEMBLY)
86