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/*
* Copyright (C) 2012, 2013, 2015 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.
*/
#include "config.h"
#include "Disassembler.h"
#include "MacroAssemblerCodeRef.h"
#include <wtf/Condition.h>
#include <wtf/DataLog.h>
#include <wtf/Deque.h>
#include <wtf/Lock.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/StringPrintStream.h>
#include <wtf/Threading.h>
namespace JSC {
void disassemble(const MacroAssemblerCodePtr& codePtr, size_t size, const char* prefix, PrintStream& out)
{
if (tryToDisassemble(codePtr, size, prefix, out))
return;
out.printf("%sdisassembly not available for range %p...%p\n", prefix, codePtr.executableAddress(), static_cast<char*>(codePtr.executableAddress()) + size);
}
namespace {
// This is really a struct, except that it should be a class because that's what the WTF_* macros
// expect.
class DisassemblyTask {
WTF_MAKE_NONCOPYABLE(DisassemblyTask);
WTF_MAKE_FAST_ALLOCATED;
public:
DisassemblyTask()
{
}
~DisassemblyTask()
{
if (header)
free(header); // free() because it would have been copied by strdup.
}
char* header { nullptr };
MacroAssemblerCodeRef codeRef;
size_t size { 0 };
const char* prefix { nullptr };
};
class AsynchronousDisassembler {
public:
AsynchronousDisassembler()
{
createThread("Asynchronous Disassembler", [&] () { run(); });
}
void enqueue(std::unique_ptr<DisassemblyTask> task)
{
LockHolder locker(m_lock);
m_queue.append(WTFMove(task));
m_condition.notifyAll();
}
void waitUntilEmpty()
{
LockHolder locker(m_lock);
while (!m_queue.isEmpty() || m_working)
m_condition.wait(m_lock);
}
private:
NO_RETURN void run()
{
for (;;) {
std::unique_ptr<DisassemblyTask> task;
{
LockHolder locker(m_lock);
m_working = false;
m_condition.notifyAll();
while (m_queue.isEmpty())
m_condition.wait(m_lock);
task = m_queue.takeFirst();
m_working = true;
}
dataLog(task->header);
disassemble(task->codeRef.code(), task->size, task->prefix, WTF::dataFile());
}
}
Lock m_lock;
Condition m_condition;
Deque<std::unique_ptr<DisassemblyTask>> m_queue;
bool m_working { false };
};
bool hadAnyAsynchronousDisassembly = false;
AsynchronousDisassembler& asynchronousDisassembler()
{
static NeverDestroyed<AsynchronousDisassembler> disassembler;
hadAnyAsynchronousDisassembly = true;
return disassembler.get();
}
} // anonymous namespace
void disassembleAsynchronously(
const CString& header, const MacroAssemblerCodeRef& codeRef, size_t size, const char* prefix)
{
std::unique_ptr<DisassemblyTask> task = std::make_unique<DisassemblyTask>();
task->header = strdup(header.data()); // Yuck! We need this because CString does racy refcounting.
task->codeRef = codeRef;
task->size = size;
task->prefix = prefix;
asynchronousDisassembler().enqueue(WTFMove(task));
}
void waitForAsynchronousDisassembly()
{
if (!hadAnyAsynchronousDisassembly)
return;
asynchronousDisassembler().waitUntilEmpty();
}
} // namespace JSC
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