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/*
* Copyright (C) 2017 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 "VM.h"
#include <wtf/DoublyLinkedList.h>
#include <wtf/Expected.h>
#include <wtf/Lock.h>
namespace JSC {
class VMInspector {
public:
enum class Error {
None,
TimedOut
};
typedef WTF::Locker<Lock> Locker;
static VMInspector& instance();
void add(VM*);
void remove(VM*);
Expected<Locker, Error> lock(Seconds timeout = Seconds::infinity());
Expected<bool, Error> isValidExecutableMemory(const Locker&, void*);
Expected<CodeBlock*, Error> codeBlockForMachinePC(const Locker&, void*);
private:
enum class FunctorStatus {
Continue,
Done
};
template <typename Functor> void iterate(const Functor& functor)
{
for (VM* vm = m_list.head(); vm; vm = vm->next()) {
FunctorStatus status = functor(*vm);
if (status == FunctorStatus::Done)
return;
}
}
Lock m_lock;
DoublyLinkedList<VM> m_list;
};
} // namespace JSC
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