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/*
* Copyright (C) 2017-2018 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.
*/
#pragma once
#if ENABLE(WEBASSEMBLY)
#include "WasmFormat.h"
#include "WasmMemory.h"
#include "WasmModule.h"
#include "WasmTable.h"
#include "WriteBarrier.h"
#include <wtf/BitVector.h>
#include <wtf/RefPtr.h>
#include <wtf/ThreadSafeRefCounted.h>
namespace JSC {
class LLIntOffsetsExtractor;
class JSWebAssemblyInstance;
namespace Wasm {
struct Context;
class Instance;
class Instance : public ThreadSafeRefCounted<Instance>, public CanMakeWeakPtr<Instance> {
friend LLIntOffsetsExtractor;
public:
using StoreTopCallFrameCallback = WTF::Function<void(void*)>;
using FunctionWrapperMap = HashMap<uint32_t, WriteBarrier<Unknown>, IntHash<uint32_t>, WTF::UnsignedWithZeroKeyHashTraits<uint32_t>>;
static Ref<Instance> create(Context*, Ref<Module>&&, EntryFrame** pointerToTopEntryFrame, void** pointerToActualStackLimit, StoreTopCallFrameCallback&&);
void finalizeCreation(void* owner, Ref<CodeBlock>&& codeBlock)
{
m_owner = owner;
m_codeBlock = WTFMove(codeBlock);
}
JS_EXPORT_PRIVATE ~Instance();
template<typename T> T* owner() const { return reinterpret_cast<T*>(m_owner); }
static ptrdiff_t offsetOfOwner() { return OBJECT_OFFSETOF(Instance, m_owner); }
size_t extraMemoryAllocated() const;
Wasm::Context* context() const { return m_context; }
Module& module() { return m_module.get(); }
CodeBlock* codeBlock() { return m_codeBlock.get(); }
Memory* memory() { return m_memory.get(); }
Table* table(unsigned);
void setTable(unsigned, Ref<Table>&&);
void* cachedMemory() const { return m_cachedMemory.getMayBeNull(cachedMemorySize()); }
size_t cachedMemorySize() const { return m_cachedMemorySize; }
void setMemory(Ref<Memory>&& memory)
{
m_memory = WTFMove(memory);
m_memory.get()->registerInstance(this);
updateCachedMemory();
}
void updateCachedMemory()
{
if (m_memory != nullptr) {
m_cachedMemory = CagedPtr<Gigacage::Primitive, void, tagCagedPtr>(memory()->memory(), memory()->size());
m_cachedMemorySize = memory()->size();
}
}
int32_t loadI32Global(unsigned i) const { return m_globals.get()[i].primitive; }
int64_t loadI64Global(unsigned i) const { return m_globals.get()[i].primitive; }
float loadF32Global(unsigned i) const { return bitwise_cast<float>(loadI32Global(i)); }
double loadF64Global(unsigned i) const { return bitwise_cast<double>(loadI64Global(i)); }
void setGlobal(unsigned i, int64_t bits) { m_globals.get()[i].primitive = bits; }
void setGlobal(unsigned, JSValue);
const BitVector& globalsToMark() { return m_globalsToMark; }
JSValue getFunctionWrapper(unsigned) const;
typename FunctionWrapperMap::ValuesConstIteratorRange functionWrappers() const { return m_functionWrappers.values(); }
void setFunctionWrapper(unsigned, JSValue);
static ptrdiff_t offsetOfMemory() { return OBJECT_OFFSETOF(Instance, m_memory); }
static ptrdiff_t offsetOfGlobals() { return OBJECT_OFFSETOF(Instance, m_globals); }
static ptrdiff_t offsetOfCachedMemory() { return OBJECT_OFFSETOF(Instance, m_cachedMemory); }
static ptrdiff_t offsetOfCachedMemorySize() { return OBJECT_OFFSETOF(Instance, m_cachedMemorySize); }
static ptrdiff_t offsetOfPointerToTopEntryFrame() { return OBJECT_OFFSETOF(Instance, m_pointerToTopEntryFrame); }
static ptrdiff_t offsetOfPointerToActualStackLimit() { return OBJECT_OFFSETOF(Instance, m_pointerToActualStackLimit); }
static ptrdiff_t offsetOfCachedStackLimit() { return OBJECT_OFFSETOF(Instance, m_cachedStackLimit); }
void* cachedStackLimit() const
{
ASSERT(*m_pointerToActualStackLimit == m_cachedStackLimit);
return m_cachedStackLimit;
}
void setCachedStackLimit(void* limit)
{
ASSERT(*m_pointerToActualStackLimit == limit || bitwise_cast<void*>(std::numeric_limits<uintptr_t>::max()) == limit);
m_cachedStackLimit = limit;
}
// Tail accessors.
static constexpr size_t offsetOfTail() { return WTF::roundUpToMultipleOf<sizeof(uint64_t)>(sizeof(Instance)); }
struct ImportFunctionInfo {
// Target instance and entrypoint are only set for wasm->wasm calls, and are otherwise nullptr. The embedder-specific logic occurs through import function.
Instance* targetInstance { nullptr };
WasmToWasmImportableFunction::LoadLocation wasmEntrypointLoadLocation { nullptr };
MacroAssemblerCodePtr<WasmEntryPtrTag> wasmToEmbedderStub;
void* importFunction { nullptr }; // In a JS embedding, this is a WriteBarrier<JSObject>.
};
unsigned numImportFunctions() const { return m_numImportFunctions; }
ImportFunctionInfo* importFunctionInfo(size_t importFunctionNum)
{
RELEASE_ASSERT(importFunctionNum < m_numImportFunctions);
return &bitwise_cast<ImportFunctionInfo*>(bitwise_cast<char*>(this) + offsetOfTail())[importFunctionNum];
}
static size_t offsetOfTargetInstance(size_t importFunctionNum) { return offsetOfTail() + importFunctionNum * sizeof(ImportFunctionInfo) + OBJECT_OFFSETOF(ImportFunctionInfo, targetInstance); }
static size_t offsetOfWasmEntrypointLoadLocation(size_t importFunctionNum) { return offsetOfTail() + importFunctionNum * sizeof(ImportFunctionInfo) + OBJECT_OFFSETOF(ImportFunctionInfo, wasmEntrypointLoadLocation); }
static size_t offsetOfWasmToEmbedderStub(size_t importFunctionNum) { return offsetOfTail() + importFunctionNum * sizeof(ImportFunctionInfo) + OBJECT_OFFSETOF(ImportFunctionInfo, wasmToEmbedderStub); }
static size_t offsetOfImportFunction(size_t importFunctionNum) { return offsetOfTail() + importFunctionNum * sizeof(ImportFunctionInfo) + OBJECT_OFFSETOF(ImportFunctionInfo, importFunction); }
template<typename T> T* importFunction(unsigned importFunctionNum) { return reinterpret_cast<T*>(&importFunctionInfo(importFunctionNum)->importFunction); }
static_assert(sizeof(ImportFunctionInfo) == WTF::roundUpToMultipleOf<sizeof(uint64_t)>(sizeof(ImportFunctionInfo)), "We rely on this for the alignment to be correct");
static constexpr size_t offsetOfTablePtr(unsigned numImportFunctions, unsigned i) { return offsetOfTail() + sizeof(ImportFunctionInfo) * numImportFunctions + sizeof(Table*) * i; }
void storeTopCallFrame(void* callFrame)
{
m_storeTopCallFrame(callFrame);
}
private:
Instance(Context*, Ref<Module>&&, EntryFrame**, void**, StoreTopCallFrameCallback&&);
static size_t allocationSize(Checked<size_t> numImportFunctions, Checked<size_t> numTables)
{
return (offsetOfTail() + sizeof(ImportFunctionInfo) * numImportFunctions + sizeof(Table*) * numTables).unsafeGet();
}
void* m_owner { nullptr }; // In a JS embedding, this is a JSWebAssemblyInstance*.
Context* m_context { nullptr };
CagedPtr<Gigacage::Primitive, void, tagCagedPtr> m_cachedMemory;
size_t m_cachedMemorySize { 0 };
Ref<Module> m_module;
RefPtr<CodeBlock> m_codeBlock;
RefPtr<Memory> m_memory;
union GlobalValue {
WriteBarrier<Unknown> anyref;
uint64_t primitive;
};
MallocPtr<GlobalValue> m_globals;
FunctionWrapperMap m_functionWrappers;
BitVector m_globalsToMark;
EntryFrame** m_pointerToTopEntryFrame { nullptr };
void** m_pointerToActualStackLimit { nullptr };
void* m_cachedStackLimit { bitwise_cast<void*>(std::numeric_limits<uintptr_t>::max()) };
StoreTopCallFrameCallback m_storeTopCallFrame;
unsigned m_numImportFunctions { 0 };
};
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)