WebKit/Source/JavaScriptCore/heap/CodeBlockSet.h at main · WebKit/WebKit · GitHub

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* 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 <JavaScriptCore/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() LIFETIME_BOUND 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

WebKit/Source/JavaScriptCore/heap/CodeBlockSet.h at main · WebKit/WebKit · GitHub

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