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CachedTypes.h
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/*
* Copyright (C) 2018-2019 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
#include "JSCast.h"
#include "ParserModes.h"
#include "VariableEnvironment.h"
#include <wtf/FileSystem.h>
#include <wtf/HashMap.h>
#include <wtf/MallocPtr.h>
namespace JSC {
class BytecodeCacheError;
class CachedBytecode;
class SourceCodeKey;
class UnlinkedCodeBlock;
class UnlinkedFunctionCodeBlock;
enum class SourceCodeType;
// This struct has to be updated when incrementally writing to the bytecode
// cache, since this will only be filled in when we parse the function
struct CachedFunctionExecutableMetadata {
CodeFeatures m_features;
bool m_hasCapturedVariables;
};
struct CachedFunctionExecutableOffsets {
static ptrdiff_t codeBlockForCallOffset();
static ptrdiff_t codeBlockForConstructOffset();
static ptrdiff_t metadataOffset();
};
struct CachedWriteBarrierOffsets {
static ptrdiff_t ptrOffset();
};
struct CachedPtrOffsets {
static ptrdiff_t offsetOffset();
};
class VariableLengthObjectBase {
friend class CachedBytecode;
protected:
VariableLengthObjectBase(ptrdiff_t offset)
: m_offset(offset)
{
}
ptrdiff_t m_offset;
};
class Decoder : public RefCounted<Decoder> {
WTF_MAKE_NONCOPYABLE(Decoder);
public:
static Ref<Decoder> create(VM&, Ref<CachedBytecode>, RefPtr<SourceProvider> = nullptr);
~Decoder();
VM& vm() { return m_vm; }
size_t size() const;
ptrdiff_t offsetOf(const void*);
void cacheOffset(ptrdiff_t, void*);
WTF::Optional<void*> cachedPtrForOffset(ptrdiff_t);
const void* ptrForOffsetFromBase(ptrdiff_t);
CompactTDZEnvironmentMap::Handle handleForTDZEnvironment(CompactTDZEnvironment*) const;
void setHandleForTDZEnvironment(CompactTDZEnvironment*, const CompactTDZEnvironmentMap::Handle&);
void addLeafExecutable(const UnlinkedFunctionExecutable*, ptrdiff_t);
RefPtr<SourceProvider> provider() const;
template<typename Functor>
void addFinalizer(const Functor&);
private:
Decoder(VM&, Ref<CachedBytecode>, RefPtr<SourceProvider>);
VM& m_vm;
Ref<CachedBytecode> m_cachedBytecode;
HashMap<ptrdiff_t, void*> m_offsetToPtrMap;
Vector<std::function<void()>> m_finalizers;
HashMap<CompactTDZEnvironment*, CompactTDZEnvironmentMap::Handle> m_environmentToHandleMap;
RefPtr<SourceProvider> m_provider;
};
JS_EXPORT_PRIVATE RefPtr<CachedBytecode> encodeCodeBlock(VM&, const SourceCodeKey&, const UnlinkedCodeBlock*);
JS_EXPORT_PRIVATE RefPtr<CachedBytecode> encodeCodeBlock(VM&, const SourceCodeKey&, const UnlinkedCodeBlock*, FileSystem::PlatformFileHandle fd, BytecodeCacheError&);
UnlinkedCodeBlock* decodeCodeBlockImpl(VM&, const SourceCodeKey&, Ref<CachedBytecode>);
template<typename UnlinkedCodeBlockType>
UnlinkedCodeBlockType* decodeCodeBlock(VM& vm, const SourceCodeKey& key, Ref<CachedBytecode> cachedBytecode)
{
return jsCast<UnlinkedCodeBlockType*>(decodeCodeBlockImpl(vm, key, WTFMove(cachedBytecode)));
}
JS_EXPORT_PRIVATE RefPtr<CachedBytecode> encodeFunctionCodeBlock(VM&, const UnlinkedFunctionCodeBlock*, BytecodeCacheError&);
JS_EXPORT_PRIVATE void decodeFunctionCodeBlock(Decoder&, int32_t cachedFunctionCodeBlockOffset, WriteBarrier<UnlinkedFunctionCodeBlock>&, const JSCell*);
bool isCachedBytecodeStillValid(VM&, Ref<CachedBytecode>, const SourceCodeKey&, SourceCodeType);
} // namespace JSC