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src/os/bsd/vm/os_bsd.hpp@b0133e4187d3 (annotated)

src/os/bsd/vm/os_bsd.hpp

Thu, 21 Nov 2013 18:29:34 -0800

author

goetz

date

Thu, 21 Nov 2013 18:29:34 -0800

changeset 6486

b0133e4187d3

parent 5834

faff125a1ead

child 6667

917873d2983d

permissions

-rw-r--r--

8028471: PPC64 (part 215): opto: Extend ImplicitNullCheck optimization.
Summary: Fixed Implicit NULL check optimization for AIX, where the page at address '0' is only write-protected.
Reviewed-by: kvn

never@3156	1	/*
simonis@4675	2	* Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
never@3156	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
never@3156	4	*
never@3156	5	* This code is free software; you can redistribute it and/or modify it
never@3156	6	* under the terms of the GNU General Public License version 2 only, as
never@3156	7	* published by the Free Software Foundation.
never@3156	8	*
never@3156	9	* This code is distributed in the hope that it will be useful, but WITHOUT
never@3156	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
never@3156	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
never@3156	12	* version 2 for more details (a copy is included in the LICENSE file that
never@3156	13	* accompanied this code).
never@3156	14	*
never@3156	15	* You should have received a copy of the GNU General Public License version
never@3156	16	* 2 along with this work; if not, write to the Free Software Foundation,
never@3156	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
never@3156	18	*
never@3156	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
never@3156	20	* or visit www.oracle.com if you need additional information or have any
never@3156	21	* questions.
never@3156	22	*
never@3156	23	*/
never@3156	24
never@3156	25	#ifndef OS_BSD_VM_OS_BSD_HPP
never@3156	26	#define OS_BSD_VM_OS_BSD_HPP
never@3156	27
never@3156	28	// Bsd_OS defines the interface to Bsd operating systems
never@3156	29
goetz@6486	30	// Information about the protection of the page at address '0' on this os.
goetz@6486	31	static bool zero_page_read_protected() { return true; }
goetz@6486	32
never@3156	33	/* pthread_getattr_np comes with BsdThreads-0.9-7 on RedHat 7.1 */
never@3156	34	typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *);
never@3156	35
never@3156	36	#ifdef __APPLE__
never@3156	37	// Mac OS X doesn't support clock_gettime. Stub out the type, it is
never@3156	38	// unused
never@3156	39	typedef int clockid_t;
never@3156	40	#endif
never@3156	41
never@3156	42	class Bsd {
never@3156	43	friend class os;
never@3156	44
never@3156	45	// For signal-chaining
never@3156	46	#define MAXSIGNUM 32
never@3156	47	static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
never@3156	48	static unsigned int sigs; // mask of signals that have
never@3156	49	// preinstalled signal handlers
never@3156	50	static bool libjsig_is_loaded; // libjsig that interposes sigaction(),
never@3156	51	// __sigaction(), signal() is loaded
never@3156	52	static struct sigaction *(*get_signal_action)(int);
never@3156	53	static struct sigaction *get_preinstalled_handler(int);
never@3156	54	static void save_preinstalled_handler(int, struct sigaction&);
never@3156	55
never@3156	56	static void check_signal_handler(int sig);
never@3156	57
never@3156	58	// For signal flags diagnostics
never@3156	59	static int sigflags[MAXSIGNUM];
never@3156	60
never@3156	61	static int (*_clock_gettime)(clockid_t, struct timespec *);
never@3156	62
never@3156	63	static GrowableArray<int>* _cpu_to_node;
never@3156	64
never@3156	65	protected:
never@3156	66
never@3156	67	static julong _physical_memory;
never@3156	68	static pthread_t _main_thread;
never@3156	69	static int _page_size;
never@3156	70
never@3156	71	static julong available_memory();
never@3156	72	static julong physical_memory() { return _physical_memory; }
never@3156	73	static void initialize_system_info();
never@3156	74
never@3156	75	static bool supports_variable_stack_size();
never@3156	76
never@3156	77	static void rebuild_cpu_to_node_map();
never@3156	78	static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; }
never@3156	79
never@3156	80	static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
never@3156	81
never@3156	82	public:
never@3156	83
never@3156	84	static void init_thread_fpu_state();
never@3156	85	static pthread_t main_thread(void) { return _main_thread; }
never@3156	86
never@3156	87	static void hotspot_sigmask(Thread* thread);
never@3156	88
never@3156	89	static bool is_initial_thread(void);
dsamersoff@5834	90	static pid_t gettid();
never@3156	91
never@3156	92	static int page_size(void) { return _page_size; }
never@3156	93	static void set_page_size(int val) { _page_size = val; }
never@3156	94
never@3156	95	static address ucontext_get_pc(ucontext_t* uc);
never@3156	96	static intptr_t* ucontext_get_sp(ucontext_t* uc);
never@3156	97	static intptr_t* ucontext_get_fp(ucontext_t* uc);
never@3156	98
never@3156	99	// For Analyzer Forte AsyncGetCallTrace profiling support:
never@3156	100	//
never@3156	101	// This interface should be declared in os_bsd_i486.hpp, but
never@3156	102	// that file provides extensions to the os class and not the
never@3156	103	// Bsd class.
never@3156	104	static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
never@3156	105	intptr_t** ret_sp, intptr_t** ret_fp);
never@3156	106
never@3156	107	// This boolean allows users to forward their own non-matching signals
never@3156	108	// to JVM_handle_bsd_signal, harmlessly.
never@3156	109	static bool signal_handlers_are_installed;
never@3156	110
never@3156	111	static int get_our_sigflags(int);
never@3156	112	static void set_our_sigflags(int, int);
never@3156	113	static void signal_sets_init();
never@3156	114	static void install_signal_handlers();
never@3156	115	static void set_signal_handler(int, bool);
never@3156	116	static bool is_sig_ignored(int sig);
never@3156	117
never@3156	118	static sigset_t* unblocked_signals();
never@3156	119	static sigset_t* vm_signals();
never@3156	120	static sigset_t* allowdebug_blocked_signals();
never@3156	121
never@3156	122	// For signal-chaining
never@3156	123	static struct sigaction *get_chained_signal_action(int sig);
never@3156	124	static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
never@3156	125
never@3156	126	// Minimum stack size a thread can be created with (allowing
never@3156	127	// the VM to completely create the thread and enter user code)
never@3156	128	static size_t min_stack_allowed;
never@3156	129
never@3156	130	// Return default stack size or guard size for the specified thread type
never@3156	131	static size_t default_stack_size(os::ThreadType thr_type);
never@3156	132	static size_t default_guard_size(os::ThreadType thr_type);
never@3156	133
never@3156	134	// Real-time clock functions
never@3156	135	static void clock_init(void);
never@3156	136
johnc@4017	137	static inline bool supports_monotonic_clock() {
never@3156	138	return _clock_gettime != NULL;
never@3156	139	}
never@3156	140
never@3156	141	static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
never@3156	142	return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
never@3156	143	}
never@3156	144
never@3156	145	// Stack repair handling
never@3156	146
never@3156	147	// none present
never@3156	148
never@3156	149	// BsdThreads work-around for 6292965
never@3156	150	static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
never@3156	151
never@3156	152	private:
never@3156	153	typedef int (*sched_getcpu_func_t)(void);
never@3156	154	typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
never@3156	155	typedef int (*numa_max_node_func_t)(void);
never@3156	156	typedef int (*numa_available_func_t)(void);
never@3156	157	typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
never@3156	158	typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
never@3156	159
never@3156	160	static sched_getcpu_func_t _sched_getcpu;
never@3156	161	static numa_node_to_cpus_func_t _numa_node_to_cpus;
never@3156	162	static numa_max_node_func_t _numa_max_node;
never@3156	163	static numa_available_func_t _numa_available;
never@3156	164	static numa_tonode_memory_func_t _numa_tonode_memory;
never@3156	165	static numa_interleave_memory_func_t _numa_interleave_memory;
never@3156	166	static unsigned long* _numa_all_nodes;
never@3156	167
never@3156	168	static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
never@3156	169	static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
never@3156	170	static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
never@3156	171	static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
never@3156	172	static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
never@3156	173	static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
never@3156	174	static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
never@3156	175	public:
never@3156	176	static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
never@3156	177	static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
never@3156	178	return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
never@3156	179	}
never@3156	180	static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
never@3156	181	static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
never@3156	182	static int numa_tonode_memory(void *start, size_t size, int node) {
never@3156	183	return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
never@3156	184	}
never@3156	185	static void numa_interleave_memory(void *start, size_t size) {
never@3156	186	if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
never@3156	187	_numa_interleave_memory(start, size, _numa_all_nodes);
never@3156	188	}
never@3156	189	}
never@3156	190	static int get_node_by_cpu(int cpu_id);
never@3156	191	};
never@3156	192
never@3156	193
zgu@3900	194	class PlatformEvent : public CHeapObj<mtInternal> {
never@3156	195	private:
never@3156	196	double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line
never@3156	197	volatile int _Event ;
never@3156	198	volatile int _nParked ;
never@3156	199	pthread_mutex_t _mutex [1] ;
never@3156	200	pthread_cond_t _cond [1] ;
never@3156	201	double PostPad [2] ;
never@3156	202	Thread * _Assoc ;
never@3156	203
never@3156	204	public: // TODO-FIXME: make dtor private
never@3156	205	~PlatformEvent() { guarantee (0, "invariant") ; }
never@3156	206
never@3156	207	public:
never@3156	208	PlatformEvent() {
never@3156	209	int status;
never@3156	210	status = pthread_cond_init (_cond, NULL);
never@3156	211	assert_status(status == 0, status, "cond_init");
never@3156	212	status = pthread_mutex_init (_mutex, NULL);
never@3156	213	assert_status(status == 0, status, "mutex_init");
never@3156	214	_Event = 0 ;
never@3156	215	_nParked = 0 ;
never@3156	216	_Assoc = NULL ;
never@3156	217	}
never@3156	218
never@3156	219	// Use caution with reset() and fired() -- they may require MEMBARs
never@3156	220	void reset() { _Event = 0 ; }
never@3156	221	int fired() { return _Event; }
never@3156	222	void park () ;
never@3156	223	void unpark () ;
never@3156	224	int TryPark () ;
never@3156	225	int park (jlong millis) ;
never@3156	226	void SetAssociation (Thread * a) { _Assoc = a ; }
sla@5237	227	};
never@3156	228
zgu@3900	229	class PlatformParker : public CHeapObj<mtInternal> {
never@3156	230	protected:
never@3156	231	pthread_mutex_t _mutex [1] ;
never@3156	232	pthread_cond_t _cond [1] ;
never@3156	233
never@3156	234	public: // TODO-FIXME: make dtor private
never@3156	235	~PlatformParker() { guarantee (0, "invariant") ; }
never@3156	236
never@3156	237	public:
never@3156	238	PlatformParker() {
never@3156	239	int status;
never@3156	240	status = pthread_cond_init (_cond, NULL);
never@3156	241	assert_status(status == 0, status, "cond_init");
never@3156	242	status = pthread_mutex_init (_mutex, NULL);
never@3156	243	assert_status(status == 0, status, "mutex_init");
never@3156	244	}
sla@5237	245	};
never@3156	246
never@3156	247	#endif // OS_BSD_VM_OS_BSD_HPP