mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2025-04-11 11:20:43 +00:00
93 lines
4.0 KiB
C++
93 lines
4.0 KiB
C++
/*
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* Copyright (C) 2019 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "CachedBytecode.h"
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#include "CachedTypes.h"
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#include "UnlinkedFunctionExecutable.h"
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namespace JSC {
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void CachedBytecode::addGlobalUpdate(Ref<CachedBytecode> bytecode)
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{
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ASSERT(m_updates.isEmpty());
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m_leafExecutables.clear();
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copyLeafExecutables(bytecode.get());
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m_updates.append(CacheUpdate::GlobalUpdate { WTFMove(bytecode->m_payload) });
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}
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void CachedBytecode::addFunctionUpdate(const UnlinkedFunctionExecutable* executable, CodeSpecializationKind kind, Ref<CachedBytecode> bytecode)
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{
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auto it = m_leafExecutables.find(executable);
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ASSERT(it != m_leafExecutables.end());
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ptrdiff_t offset = it->value.base();
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ASSERT(offset);
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copyLeafExecutables(bytecode.get());
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m_updates.append(CacheUpdate::FunctionUpdate { offset, kind, { executable->features(), executable->hasCapturedVariables() }, WTFMove(bytecode->m_payload) });
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}
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void CachedBytecode::copyLeafExecutables(const CachedBytecode& bytecode)
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{
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for (const auto& it : bytecode.m_leafExecutables) {
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auto addResult = m_leafExecutables.add(it.key, it.value + m_size);
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ASSERT_UNUSED(addResult, addResult.isNewEntry);
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}
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m_size += bytecode.size();
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}
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void CachedBytecode::commitUpdates(const ForEachUpdateCallback& callback) const
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{
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off_t offset = m_payload.size();
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for (const auto& update : m_updates) {
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const CachePayload* payload = nullptr;
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if (update.isGlobal())
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payload = &update.asGlobal().m_payload;
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else {
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const CacheUpdate::FunctionUpdate& functionUpdate = update.asFunction();
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payload = &functionUpdate.m_payload;
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{
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ptrdiff_t kindOffset = functionUpdate.m_kind == CodeForCall ? CachedFunctionExecutableOffsets::codeBlockForCallOffset() : CachedFunctionExecutableOffsets::codeBlockForConstructOffset();
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ptrdiff_t codeBlockOffset = functionUpdate.m_base + kindOffset + CachedWriteBarrierOffsets::ptrOffset() + CachedPtrOffsets::offsetOffset();
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ptrdiff_t offsetPayload = static_cast<ptrdiff_t>(offset) - codeBlockOffset;
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static_assert(std::is_same<decltype(VariableLengthObjectBase::m_offset), ptrdiff_t>::value, "");
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callback(codeBlockOffset, &offsetPayload, sizeof(ptrdiff_t));
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}
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{
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ptrdiff_t metadataOffset = functionUpdate.m_base + CachedFunctionExecutableOffsets::metadataOffset();
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callback(metadataOffset, &functionUpdate.m_metadata, sizeof(functionUpdate.m_metadata));
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}
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}
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ASSERT(payload);
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callback(offset, payload->data(), payload->size());
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offset += payload->size();
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}
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ASSERT(static_cast<size_t>(offset) == m_size);
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}
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} // namespace JSC
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