1/*
2 * Copyright (C) 2019 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "CachedBytecode.h"
28
29#include "CachedTypes.h"
30#include "UnlinkedFunctionExecutable.h"
31#include <wtf/Function.h>
32
33namespace JSC {
34
35void CachedBytecode::addGlobalUpdate(Ref<CachedBytecode> bytecode)
36{
37 ASSERT(m_updates.isEmpty());
38 m_leafExecutables.clear();
39 copyLeafExecutables(bytecode.get());
40 m_updates.append(CacheUpdate::GlobalUpdate { WTFMove(bytecode->m_payload) });
41}
42
43void CachedBytecode::addFunctionUpdate(const UnlinkedFunctionExecutable* executable, CodeSpecializationKind kind, Ref<CachedBytecode> bytecode)
44{
45 auto it = m_leafExecutables.find(executable);
46 ASSERT(it != m_leafExecutables.end());
47 ptrdiff_t offset = it->value.base();
48 ASSERT(offset);
49 copyLeafExecutables(bytecode.get());
50 m_updates.append(CacheUpdate::FunctionUpdate { offset, kind, { executable->features(), executable->hasCapturedVariables() }, WTFMove(bytecode->m_payload) });
51}
52
53void CachedBytecode::copyLeafExecutables(const CachedBytecode& bytecode)
54{
55 for (const auto& it : bytecode.m_leafExecutables) {
56 auto addResult = m_leafExecutables.add(it.key, it.value + m_size);
57 ASSERT_UNUSED(addResult, addResult.isNewEntry);
58 }
59 m_size += bytecode.size();
60}
61
62void CachedBytecode::commitUpdates(const ForEachUpdateCallback& callback) const
63{
64 off_t offset = m_payload.size();
65 for (const auto& update : m_updates) {
66 const CachePayload* payload = nullptr;
67 if (update.isGlobal())
68 payload = &update.asGlobal().m_payload;
69 else {
70 const CacheUpdate::FunctionUpdate& functionUpdate = update.asFunction();
71 payload = &functionUpdate.m_payload;
72 {
73 ptrdiff_t kindOffset = functionUpdate.m_kind == CodeForCall ? CachedFunctionExecutableOffsets::codeBlockForCallOffset() : CachedFunctionExecutableOffsets::codeBlockForConstructOffset();
74 ptrdiff_t codeBlockOffset = functionUpdate.m_base + kindOffset + CachedWriteBarrierOffsets::ptrOffset() + CachedPtrOffsets::offsetOffset();
75 ptrdiff_t offsetPayload = static_cast<ptrdiff_t>(offset) - codeBlockOffset;
76 static_assert(std::is_same<decltype(VariableLengthObjectBase::m_offset), ptrdiff_t>::value, "");
77 callback(codeBlockOffset, &offsetPayload, sizeof(ptrdiff_t));
78 }
79
80 {
81 ptrdiff_t metadataOffset = functionUpdate.m_base + CachedFunctionExecutableOffsets::metadataOffset();
82 callback(metadataOffset, &functionUpdate.m_metadata, sizeof(functionUpdate.m_metadata));
83 }
84 }
85
86 ASSERT(payload);
87 callback(offset, payload->data(), payload->size());
88 offset += payload->size();
89 }
90 ASSERT(static_cast<size_t>(offset) == m_size);
91}
92
93} // namespace JSC
94