• file
• revisions
• annotate
• diff
• comparison
• raw

src/os/linux/vm/os_linux.hpp@b0133e4187d3 (annotated)

src/os/linux/vm/os_linux.hpp

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

author

goetz

date

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

changeset 6486

b0133e4187d3

parent 5679

2e6938dd68f2

child 6876

710a3c8b516e

child 7074

833b0f92429a

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

duke@435	1	/*
simonis@4675	2	* Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#ifndef OS_LINUX_VM_OS_LINUX_HPP
stefank@2314	26	#define OS_LINUX_VM_OS_LINUX_HPP
stefank@2314	27
duke@435	28	// Linux_OS defines the interface to Linux operating systems
duke@435	29
duke@435	30	/* pthread_getattr_np comes with LinuxThreads-0.9-7 on RedHat 7.1 */
duke@435	31	typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *);
duke@435	32
goetz@6486	33	// Information about the protection of the page at address '0' on this os.
goetz@6486	34	static bool zero_page_read_protected() { return true; }
goetz@6486	35
duke@435	36	class Linux {
duke@435	37	friend class os;
stefank@5578	38	friend class TestReserveMemorySpecial;
duke@435	39
duke@435	40	// For signal-chaining
duke@435	41	#define MAXSIGNUM 32
duke@435	42	static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
duke@435	43	static unsigned int sigs; // mask of signals that have
duke@435	44	// preinstalled signal handlers
duke@435	45	static bool libjsig_is_loaded; // libjsig that interposes sigaction(),
duke@435	46	// __sigaction(), signal() is loaded
duke@435	47	static struct sigaction *(*get_signal_action)(int);
duke@435	48	static struct sigaction *get_preinstalled_handler(int);
duke@435	49	static void save_preinstalled_handler(int, struct sigaction&);
duke@435	50
duke@435	51	static void check_signal_handler(int sig);
duke@435	52
duke@435	53	// For signal flags diagnostics
duke@435	54	static int sigflags[MAXSIGNUM];
duke@435	55
duke@435	56	static int (*_clock_gettime)(clockid_t, struct timespec *);
duke@435	57	static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *);
duke@435	58
duke@435	59	static address _initial_thread_stack_bottom;
duke@435	60	static uintptr_t _initial_thread_stack_size;
duke@435	61
xlu@634	62	static const char *_glibc_version;
xlu@634	63	static const char *_libpthread_version;
duke@435	64
duke@435	65	static bool _is_floating_stack;
duke@435	66	static bool _is_NPTL;
duke@435	67	static bool _supports_fast_thread_cpu_time;
duke@435	68
iveresov@576	69	static GrowableArray<int>* _cpu_to_node;
iveresov@576	70
duke@435	71	protected:
duke@435	72
duke@435	73	static julong _physical_memory;
duke@435	74	static pthread_t _main_thread;
duke@435	75	static Mutex* _createThread_lock;
duke@435	76	static int _page_size;
vladidan@4996	77	static const int _vm_default_page_size;
duke@435	78
duke@435	79	static julong available_memory();
duke@435	80	static julong physical_memory() { return _physical_memory; }
duke@435	81	static void initialize_system_info();
duke@435	82
dcubed@5255	83	static int commit_memory_impl(char* addr, size_t bytes, bool exec);
dcubed@5255	84	static int commit_memory_impl(char* addr, size_t bytes,
dcubed@5255	85	size_t alignment_hint, bool exec);
dcubed@5255	86
xlu@634	87	static void set_glibc_version(const char *s) { _glibc_version = s; }
xlu@634	88	static void set_libpthread_version(const char *s) { _libpthread_version = s; }
duke@435	89
duke@435	90	static bool supports_variable_stack_size();
duke@435	91
duke@435	92	static void set_is_NPTL() { _is_NPTL = true; }
duke@435	93	static void set_is_LinuxThreads() { _is_NPTL = false; }
duke@435	94	static void set_is_floating_stack() { _is_floating_stack = true; }
duke@435	95
iveresov@576	96	static void rebuild_cpu_to_node_map();
iveresov@576	97	static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; }
iveresov@2818	98
stefank@5578	99	static size_t find_large_page_size();
stefank@5578	100	static size_t setup_large_page_size();
stefank@5578	101
stefank@5578	102	static bool setup_large_page_type(size_t page_size);
stefank@5578	103	static bool transparent_huge_pages_sanity_check(bool warn, size_t pages_size);
iveresov@2818	104	static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
iveresov@2818	105
stefank@5578	106	static char* reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec);
stefank@5578	107	static char* reserve_memory_special_huge_tlbfs(size_t bytes, size_t alignment, char* req_addr, bool exec);
stefank@5578	108	static char* reserve_memory_special_huge_tlbfs_only(size_t bytes, char* req_addr, bool exec);
stefank@5578	109	static char* reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec);
stefank@5578	110
stefank@5578	111	static bool release_memory_special_shm(char* base, size_t bytes);
stefank@5578	112	static bool release_memory_special_huge_tlbfs(char* base, size_t bytes);
stefank@5578	113
nloodin@3783	114	static void print_full_memory_info(outputStream* st);
nloodin@3783	115	static void print_distro_info(outputStream* st);
nloodin@3783	116	static void print_libversion_info(outputStream* st);
nloodin@3783	117
duke@435	118	public:
iklam@4710	119	static bool _stack_is_executable;
iklam@4812	120	static void *dlopen_helper(const char *name, char *ebuf, int ebuflen);
iklam@4812	121	static void *dll_load_in_vmthread(const char *name, char *ebuf, int ebuflen);
iklam@4710	122
duke@435	123	static void init_thread_fpu_state();
duke@435	124	static int get_fpu_control_word();
duke@435	125	static void set_fpu_control_word(int fpu_control);
duke@435	126	static pthread_t main_thread(void) { return _main_thread; }
duke@435	127	// returns kernel thread id (similar to LWP id on Solaris), which can be
duke@435	128	// used to access /proc
duke@435	129	static pid_t gettid();
duke@435	130	static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; }
duke@435	131	static Mutex* createThread_lock(void) { return _createThread_lock; }
duke@435	132	static void hotspot_sigmask(Thread* thread);
duke@435	133
duke@435	134	static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; }
duke@435	135	static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; }
duke@435	136	static bool is_initial_thread(void);
duke@435	137
duke@435	138	static int page_size(void) { return _page_size; }
duke@435	139	static void set_page_size(int val) { _page_size = val; }
duke@435	140
vladidan@4996	141	static int vm_default_page_size(void) { return _vm_default_page_size; }
vladidan@4996	142
duke@435	143	static address ucontext_get_pc(ucontext_t* uc);
duke@435	144	static intptr_t* ucontext_get_sp(ucontext_t* uc);
duke@435	145	static intptr_t* ucontext_get_fp(ucontext_t* uc);
duke@435	146
duke@435	147	// For Analyzer Forte AsyncGetCallTrace profiling support:
duke@435	148	//
duke@435	149	// This interface should be declared in os_linux_i486.hpp, but
duke@435	150	// that file provides extensions to the os class and not the
duke@435	151	// Linux class.
duke@435	152	static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
duke@435	153	intptr_t** ret_sp, intptr_t** ret_fp);
duke@435	154
duke@435	155	// This boolean allows users to forward their own non-matching signals
duke@435	156	// to JVM_handle_linux_signal, harmlessly.
duke@435	157	static bool signal_handlers_are_installed;
duke@435	158
duke@435	159	static int get_our_sigflags(int);
duke@435	160	static void set_our_sigflags(int, int);
duke@435	161	static void signal_sets_init();
duke@435	162	static void install_signal_handlers();
duke@435	163	static void set_signal_handler(int, bool);
duke@435	164	static bool is_sig_ignored(int sig);
duke@435	165
duke@435	166	static sigset_t* unblocked_signals();
duke@435	167	static sigset_t* vm_signals();
duke@435	168	static sigset_t* allowdebug_blocked_signals();
duke@435	169
duke@435	170	// For signal-chaining
duke@435	171	static struct sigaction *get_chained_signal_action(int sig);
duke@435	172	static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
duke@435	173
duke@435	174	// GNU libc and libpthread version strings
xlu@634	175	static const char *glibc_version() { return _glibc_version; }
xlu@634	176	static const char *libpthread_version() { return _libpthread_version; }
duke@435	177
duke@435	178	// NPTL or LinuxThreads?
duke@435	179	static bool is_LinuxThreads() { return !_is_NPTL; }
duke@435	180	static bool is_NPTL() { return _is_NPTL; }
duke@435	181
duke@435	182	// NPTL is always floating stack. LinuxThreads could be using floating
duke@435	183	// stack or fixed stack.
duke@435	184	static bool is_floating_stack() { return _is_floating_stack; }
duke@435	185
duke@435	186	static void libpthread_init();
iveresov@897	187	static bool libnuma_init();
iveresov@1198	188	static void* libnuma_dlsym(void* handle, const char* name);
duke@435	189	// Minimum stack size a thread can be created with (allowing
duke@435	190	// the VM to completely create the thread and enter user code)
duke@435	191	static size_t min_stack_allowed;
duke@435	192
duke@435	193	// Return default stack size or guard size for the specified thread type
duke@435	194	static size_t default_stack_size(os::ThreadType thr_type);
duke@435	195	static size_t default_guard_size(os::ThreadType thr_type);
duke@435	196
duke@435	197	static void capture_initial_stack(size_t max_size);
duke@435	198
duke@435	199	// Stack overflow handling
duke@435	200	static bool manually_expand_stack(JavaThread * t, address addr);
duke@435	201	static int max_register_window_saves_before_flushing();
duke@435	202
duke@435	203	// Real-time clock functions
duke@435	204	static void clock_init(void);
duke@435	205
duke@435	206	// fast POSIX clocks support
duke@435	207	static void fast_thread_clock_init(void);
duke@435	208
johnc@4017	209	static inline bool supports_monotonic_clock() {
duke@435	210	return _clock_gettime != NULL;
duke@435	211	}
duke@435	212
duke@435	213	static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
duke@435	214	return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
duke@435	215	}
duke@435	216
duke@435	217	static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) {
duke@435	218	return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1;
duke@435	219	}
duke@435	220
duke@435	221	static bool supports_fast_thread_cpu_time() {
duke@435	222	return _supports_fast_thread_cpu_time;
duke@435	223	}
duke@435	224
duke@435	225	static jlong fast_thread_cpu_time(clockid_t clockid);
duke@435	226
dholmes@5679	227	// pthread_cond clock suppport
dholmes@5679	228	private:
dholmes@5679	229	static pthread_condattr_t _condattr[1];
dholmes@5679	230
dholmes@5679	231	public:
dholmes@5679	232	static pthread_condattr_t* condAttr() { return _condattr; }
dholmes@5679	233
duke@435	234	// Stack repair handling
duke@435	235
duke@435	236	// none present
duke@435	237
duke@435	238	// LinuxThreads work-around for 6292965
duke@435	239	static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
duke@435	240
iveresov@576	241	private:
iveresov@576	242	typedef int (*sched_getcpu_func_t)(void);
iveresov@576	243	typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
iveresov@576	244	typedef int (*numa_max_node_func_t)(void);
iveresov@576	245	typedef int (*numa_available_func_t)(void);
iveresov@576	246	typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
iveresov@897	247	typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
mgerdin@5644	248	typedef void (*numa_set_bind_policy_func_t)(int policy);
iveresov@576	249
iveresov@576	250	static sched_getcpu_func_t _sched_getcpu;
iveresov@576	251	static numa_node_to_cpus_func_t _numa_node_to_cpus;
iveresov@576	252	static numa_max_node_func_t _numa_max_node;
iveresov@576	253	static numa_available_func_t _numa_available;
iveresov@576	254	static numa_tonode_memory_func_t _numa_tonode_memory;
iveresov@897	255	static numa_interleave_memory_func_t _numa_interleave_memory;
mgerdin@5644	256	static numa_set_bind_policy_func_t _numa_set_bind_policy;
iveresov@897	257	static unsigned long* _numa_all_nodes;
iveresov@576	258
iveresov@576	259	static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
iveresov@576	260	static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
iveresov@576	261	static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
iveresov@576	262	static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
iveresov@576	263	static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
iveresov@897	264	static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
mgerdin@5644	265	static void set_numa_set_bind_policy(numa_set_bind_policy_func_t func) { _numa_set_bind_policy = func; }
iveresov@897	266	static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
iveresov@3024	267	static int sched_getcpu_syscall(void);
iveresov@576	268	public:
iveresov@576	269	static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
iveresov@576	270	static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
iveresov@576	271	return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
iveresov@576	272	}
iveresov@576	273	static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
iveresov@576	274	static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
iveresov@576	275	static int numa_tonode_memory(void *start, size_t size, int node) {
iveresov@576	276	return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
iveresov@576	277	}
iveresov@897	278	static void numa_interleave_memory(void *start, size_t size) {
iveresov@897	279	if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
iveresov@897	280	_numa_interleave_memory(start, size, _numa_all_nodes);
iveresov@897	281	}
iveresov@897	282	}
mgerdin@5644	283	static void numa_set_bind_policy(int policy) {
mgerdin@5644	284	if (_numa_set_bind_policy != NULL) {
mgerdin@5644	285	_numa_set_bind_policy(policy);
mgerdin@5644	286	}
mgerdin@5644	287	}
iveresov@576	288	static int get_node_by_cpu(int cpu_id);
duke@435	289	};
duke@435	290
duke@435	291
zgu@3900	292	class PlatformEvent : public CHeapObj<mtInternal> {
duke@435	293	private:
duke@435	294	double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line
duke@435	295	volatile int _Event ;
duke@435	296	volatile int _nParked ;
duke@435	297	pthread_mutex_t _mutex [1] ;
duke@435	298	pthread_cond_t _cond [1] ;
duke@435	299	double PostPad [2] ;
duke@435	300	Thread * _Assoc ;
duke@435	301
duke@435	302	public: // TODO-FIXME: make dtor private
duke@435	303	~PlatformEvent() { guarantee (0, "invariant") ; }
duke@435	304
duke@435	305	public:
duke@435	306	PlatformEvent() {
duke@435	307	int status;
dholmes@5679	308	status = pthread_cond_init (_cond, os::Linux::condAttr());
duke@435	309	assert_status(status == 0, status, "cond_init");
duke@435	310	status = pthread_mutex_init (_mutex, NULL);
duke@435	311	assert_status(status == 0, status, "mutex_init");
duke@435	312	_Event = 0 ;
duke@435	313	_nParked = 0 ;
duke@435	314	_Assoc = NULL ;
duke@435	315	}
duke@435	316
duke@435	317	// Use caution with reset() and fired() -- they may require MEMBARs
duke@435	318	void reset() { _Event = 0 ; }
duke@435	319	int fired() { return _Event; }
duke@435	320	void park () ;
duke@435	321	void unpark () ;
duke@435	322	int TryPark () ;
dholmes@5679	323	int park (jlong millis) ; // relative timed-wait only
duke@435	324	void SetAssociation (Thread * a) { _Assoc = a ; }
duke@435	325	} ;
duke@435	326
zgu@3900	327	class PlatformParker : public CHeapObj<mtInternal> {
duke@435	328	protected:
dholmes@5679	329	enum {
dholmes@5679	330	REL_INDEX = 0,
dholmes@5679	331	ABS_INDEX = 1
dholmes@5679	332	};
dholmes@5679	333	int _cur_index; // which cond is in use: -1, 0, 1
duke@435	334	pthread_mutex_t _mutex [1] ;
dholmes@5679	335	pthread_cond_t _cond [2] ; // one for relative times and one for abs.
duke@435	336
duke@435	337	public: // TODO-FIXME: make dtor private
duke@435	338	~PlatformParker() { guarantee (0, "invariant") ; }
duke@435	339
duke@435	340	public:
duke@435	341	PlatformParker() {
duke@435	342	int status;
dholmes@5679	343	status = pthread_cond_init (&_cond[REL_INDEX], os::Linux::condAttr());
dholmes@5679	344	assert_status(status == 0, status, "cond_init rel");
dholmes@5679	345	status = pthread_cond_init (&_cond[ABS_INDEX], NULL);
dholmes@5679	346	assert_status(status == 0, status, "cond_init abs");
duke@435	347	status = pthread_mutex_init (_mutex, NULL);
duke@435	348	assert_status(status == 0, status, "mutex_init");
dholmes@5679	349	_cur_index = -1; // mark as unused
duke@435	350	}
sla@5237	351	};
stefank@2314	352
stefank@2314	353	#endif // OS_LINUX_VM_OS_LINUX_HPP