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Commit	Line	Data
	1	/*
	2	* Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
	3	* Copyright (C) 2001 Peter Kelly (pmk@post.com)
	4	* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
	5	*
	6	* This library is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU Lesser General Public
	8	* License as published by the Free Software Foundation; either
	9	* version 2 of the License, or (at your option) any later version.
	10	*
	11	* This library is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* Lesser General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU Lesser General Public
	17	* License along with this library; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	19	*
	20	*/
	21
	22	#ifndef MachineThreads_h
	23	#define MachineThreads_h
	24
	25	#include <setjmp.h>
	26	#include <wtf/Noncopyable.h>
	27	#include <wtf/ThreadSpecific.h>
	28	#include <wtf/ThreadingPrimitives.h>
	29
	30	namespace JSC {
	31
	32	class CodeBlockSet;
	33	class ConservativeRoots;
	34	class Heap;
	35	class JITStubRoutineSet;
	36
	37	class MachineThreads {
	38	WTF_MAKE_NONCOPYABLE(MachineThreads);
	39	public:
	40	typedef jmp_buf RegisterState;
	41
	42	MachineThreads(Heap*);
	43	~MachineThreads();
	44
	45	void gatherConservativeRoots(ConservativeRoots&, JITStubRoutineSet&, CodeBlockSet&, void* stackOrigin, void* stackTop, RegisterState& calleeSavedRegisters);
	46
	47	JS_EXPORT_PRIVATE void addCurrentThread(); // Only needs to be called by clients that can use the same heap from multiple threads.
	48
	49	private:
	50	class Thread;
	51
	52	void gatherFromCurrentThread(ConservativeRoots&, JITStubRoutineSet&, CodeBlockSet&, void* stackOrigin, void* stackTop, RegisterState& calleeSavedRegisters);
	53
	54	void tryCopyOtherThreadStack(Thread, void, size_t capacity, size_t*);
	55	bool tryCopyOtherThreadStacks(MutexLocker&, void, size_t capacity, size_t);
	56
	57	static void removeThread(void*);
	58
	59	template<typename PlatformThread>
	60	void removeThreadIfFound(PlatformThread);
	61
	62	Mutex m_registeredThreadsMutex;
	63	Thread* m_registeredThreads;
	64	WTF::ThreadSpecificKey m_threadSpecific;
	65	#if !ASSERT_DISABLED
	66	Heap* m_heap;
	67	#endif
	68	};
	69
	70	} // namespace JSC
	71
	72	#if COMPILER(GCC)
	73	#define REGISTER_BUFFER_ALIGNMENT __attribute__ ((aligned (sizeof(void*))))
	74	#else
	75	#define REGISTER_BUFFER_ALIGNMENT
	76	#endif
	77
	78	// ALLOCATE_AND_GET_REGISTER_STATE() is a macro so that it is always "inlined" even in debug builds.
	79	#if COMPILER(MSVC)
	80	#pragma warning(push)
	81	#pragma warning(disable: 4611)
	82	#define ALLOCATE_AND_GET_REGISTER_STATE(registers) \
	83	MachineThreads::RegisterState registers REGISTER_BUFFER_ALIGNMENT; \
	84	setjmp(registers)
	85	#pragma warning(pop)
	86	#else
	87	#define ALLOCATE_AND_GET_REGISTER_STATE(registers) \
	88	MachineThreads::RegisterState registers REGISTER_BUFFER_ALIGNMENT; \
	89	setjmp(registers)
	90	#endif
	91
	92	#endif // MachineThreads_h