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/*
* Copyright (C) 2022-2023 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 "Options.h"
#include <optional>
#include <wtf/HashMap.h>
#include <wtf/Lock.h>
#include <wtf/StdMap.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/text/WTFString.h>
namespace JSC {
class AssemblyCommentRegistry {
WTF_MAKE_TZONE_ALLOCATED(AssemblyCommentRegistry);
WTF_MAKE_NONCOPYABLE(AssemblyCommentRegistry);
public:
static AssemblyCommentRegistry& singleton();
static void initialize();
Lock& getLock() WTF_RETURNS_LOCK(m_lock) { return m_lock; }
using CommentMap = UncheckedKeyHashMap<uintptr_t, String>;
void registerCodeRange(void* start, void* end, CommentMap&& map)
{
if (LIKELY(!Options::needDisassemblySupport()) || !map.size())
return;
Locker locker { m_lock };
auto newStart = std::bit_cast<uintptr_t>(start);
auto newEnd = std::bit_cast<uintptr_t>(end);
RELEASE_ASSERT(newStart < newEnd);
#if ASSERT_ENABLED
for (auto it : m_comments) {
auto thisStart = orderedKeyInverse(it.first);
auto& [thisEnd, _] = it.second;
ASSERT(newEnd <= thisStart
|| thisEnd <= newStart);
ASSERT(thisStart < thisEnd);
}
#else
(void) newStart;
#endif
m_comments.emplace(orderedKey(start), std::pair { newEnd, WTFMove(map) });
}
void unregisterCodeRange(void* start, void* end)
{
if (LIKELY(!Options::needDisassemblySupport()))
return;
Locker locker { m_lock };
auto it = m_comments.find(orderedKey(start));
if (it == m_comments.end())
return;
auto& [foundEnd, _] = it->second;
RELEASE_ASSERT(foundEnd == std::bit_cast<uintptr_t>(end));
m_comments.erase(it);
}
inline std::optional<String> comment(void* in)
{
if (LIKELY(!Options::needDisassemblySupport()))
return { };
Locker locker { m_lock };
auto it = m_comments.lower_bound(orderedKey(in));
if (it == m_comments.end())
return { };
auto& [end, map] = it->second;
if (std::bit_cast<uintptr_t>(in) > std::bit_cast<uintptr_t>(end))
return { };
auto it2 = map.find(std::bit_cast<uintptr_t>(in));
if (it2 == map.end())
return { };
return { it2->value.isolatedCopy() };
}
AssemblyCommentRegistry() = default;
private:
// Flip ordering for lower_bound comparator to work.
inline uintptr_t orderedKey(void* in) { return std::numeric_limits<uintptr_t>::max() - std::bit_cast<uintptr_t>(in); }
inline uintptr_t orderedKeyInverse(uintptr_t in) { return std::numeric_limits<uintptr_t>::max() - in; }
Lock m_lock;
StdMap<uintptr_t, std::pair<uintptr_t, CommentMap>> m_comments WTF_GUARDED_BY_LOCK(m_lock);
};
} // namespace JSC
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