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/*
* Copyright (C) 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.
*/
#include "config.h"
#include "CachedBytecode.h"
#include "CachedTypes.h"
#include "UnlinkedFunctionExecutable.h"
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
void CachedBytecode::addGlobalUpdate(Ref<CachedBytecode> bytecode)
{
ASSERT(m_updates.isEmpty());
m_leafExecutables.clear();
copyLeafExecutables(bytecode.get());
m_updates.append(CacheUpdate::GlobalUpdate { WTFMove(bytecode->m_payload) });
}
void CachedBytecode::addFunctionUpdate(const UnlinkedFunctionExecutable* executable, CodeSpecializationKind kind, Ref<CachedBytecode> bytecode)
{
auto it = m_leafExecutables.find(executable);
ASSERT(it != m_leafExecutables.end());
ptrdiff_t offset = it->value.base();
ASSERT(offset);
copyLeafExecutables(bytecode.get());
m_updates.append(CacheUpdate::FunctionUpdate { offset, kind, { executable->features(), executable->lexicallyScopedFeatures(), executable->hasCapturedVariables() }, WTFMove(bytecode->m_payload) });
}
void CachedBytecode::copyLeafExecutables(const CachedBytecode& bytecode)
{
for (const auto& it : bytecode.m_leafExecutables) {
auto addResult = m_leafExecutables.add(it.key, it.value + m_size);
ASSERT_UNUSED(addResult, addResult.isNewEntry);
}
m_size += bytecode.size();
}
void CachedBytecode::commitUpdates(const ForEachUpdateCallback& callback) const
{
off_t offset = m_payload.size();
for (const auto& update : m_updates) {
const CachePayload* payload = nullptr;
if (update.isGlobal())
payload = &update.asGlobal().m_payload;
else {
const CacheUpdate::FunctionUpdate& functionUpdate = update.asFunction();
payload = &functionUpdate.m_payload;
{
ptrdiff_t kindOffset = functionUpdate.m_kind == CodeForCall ? CachedFunctionExecutableOffsets::codeBlockForCallOffset() : CachedFunctionExecutableOffsets::codeBlockForConstructOffset();
ptrdiff_t codeBlockOffset = functionUpdate.m_base + kindOffset + CachedWriteBarrierOffsets::ptrOffset() + CachedPtrOffsets::offsetOffset();
ptrdiff_t offsetPayload = static_cast<ptrdiff_t>(offset) - codeBlockOffset;
static_assert(std::is_same<decltype(VariableLengthObjectBase::m_offset), ptrdiff_t>::value);
callback(codeBlockOffset, { reinterpret_cast<const uint8_t*>(&offsetPayload), sizeof(ptrdiff_t) });
}
{
ptrdiff_t metadataOffset = functionUpdate.m_base + CachedFunctionExecutableOffsets::metadataOffset();
callback(metadataOffset, { reinterpret_cast<const uint8_t*>(&functionUpdate.m_metadata), sizeof(functionUpdate.m_metadata) });
}
}
ASSERT(payload);
callback(offset, payload->span());
offset += payload->size();
}
ASSERT(static_cast<size_t>(offset) == m_size);
}
} // namespace JSC
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
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