| /* |
| * 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); |
| CompactVariableMap::Handle handleForEnvironment(CompactVariableEnvironment*) const; |
| void setHandleForEnvironment(CompactVariableEnvironment*, const CompactVariableMap::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<CompactVariableEnvironment*, CompactVariableMap::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 |