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/*
* Copyright (C) 2013-2023 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 "CollectionScope.h"
#include <wtf/HashSet.h>
#include <wtf/Lock.h>
#include <wtf/Noncopyable.h>
#include <wtf/PrintStream.h>
#include <wtf/TZoneMalloc.h>
namespace JSC {
class CodeBlock;
class Heap;
class JSCell;
class VM;
// CodeBlockSet tracks all CodeBlocks. Every CodeBlock starts out with one
// reference coming in from GC. The GC is responsible for freeing CodeBlocks
// once they hasOneRef() and nobody is running code from that CodeBlock.
class CodeBlockSet {
WTF_MAKE_TZONE_ALLOCATED(CodeBlockSet);
WTF_MAKE_NONCOPYABLE(CodeBlockSet);
public:
CodeBlockSet();
~CodeBlockSet();
void mark(const AbstractLocker&, CodeBlock* candidateCodeBlock);
void clearCurrentlyExecutingAndRemoveDeadCodeBlocks(VM&);
bool contains(const AbstractLocker&, void* candidateCodeBlock);
Lock& getLock() WTF_RETURNS_LOCK(m_lock) { return m_lock; }
// This is expected to run only when we're not adding to the set for now. If
// this needs to run concurrently in the future, we'll need to lock around this.
bool isCurrentlyExecuting(CodeBlock*);
// Visits each CodeBlock in the heap until the visitor function returns true
// to indicate that it is done iterating, or until every CodeBlock has been
// visited.
template<typename Functor> void iterate(const Functor&);
template<typename Functor> void iterate(const AbstractLocker&, const Functor&);
template<typename Functor> void iterateCurrentlyExecuting(const Functor&);
void dump(PrintStream&) const;
void add(CodeBlock*);
void remove(CodeBlock*);
private:
UncheckedKeyHashSet<CodeBlock*> m_codeBlocks;
UncheckedKeyHashSet<CodeBlock*> m_currentlyExecuting;
Lock m_lock;
};
} // namespace JSC
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