Fri, 21 Nov 2008 08:09:11 -0800
6676175: BigApps crash JVM Client VM (build 10.0-b22, mixed mode, sharing) with SIGSEGV (0xb)
Summary: Add test for biased locking epoch before walking own thread stack in case of rare race
Reviewed-by: phh, never
1 /*
2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 // os defines the interface to operating system; this includes traditional
26 // OS services (time, I/O) as well as other functionality with system-
27 // dependent code.
29 typedef void (*dll_func)(...);
31 class Thread;
32 class JavaThread;
33 class Event;
34 class DLL;
35 class FileHandle;
36 template<class E> class GrowableArray;
38 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose
40 // Platform-independent error return values from OS functions
41 enum OSReturn {
42 OS_OK = 0, // Operation was successful
43 OS_ERR = -1, // Operation failed
44 OS_INTRPT = -2, // Operation was interrupted
45 OS_TIMEOUT = -3, // Operation timed out
46 OS_NOMEM = -5, // Operation failed for lack of memory
47 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource
48 };
50 enum ThreadPriority { // JLS 20.20.1-3
51 NoPriority = -1, // Initial non-priority value
52 MinPriority = 1, // Minimum priority
53 NormPriority = 5, // Normal (non-daemon) priority
54 NearMaxPriority = 9, // High priority, used for VMThread
55 MaxPriority = 10 // Highest priority, used for WatcherThread
56 // ensures that VMThread doesn't starve profiler
57 };
59 // Typedef for structured exception handling support
60 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
62 class os: AllStatic {
63 private:
64 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel)
66 static OSThread* _starting_thread;
67 static address _polling_page;
68 static volatile int32_t * _mem_serialize_page;
69 static uintptr_t _serialize_page_mask;
70 static size_t _page_sizes[page_sizes_max];
72 static void init_page_sizes(size_t default_page_size) {
73 _page_sizes[0] = default_page_size;
74 _page_sizes[1] = 0; // sentinel
75 }
77 public:
79 static void init(void); // Called before command line parsing
80 static jint init_2(void); // Called after command line parsing
82 // File names are case-insensitive on windows only
83 // Override me as needed
84 static int file_name_strcmp(const char* s1, const char* s2);
86 static bool getenv(const char* name, char* buffer, int len);
87 static bool have_special_privileges();
89 static jlong javaTimeMillis();
90 static jlong javaTimeNanos();
91 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr);
92 static void run_periodic_checks();
95 // Returns the elapsed time in seconds since the vm started.
96 static double elapsedTime();
98 // Returns real time in seconds since an arbitrary point
99 // in the past.
100 static bool getTimesSecs(double* process_real_time,
101 double* process_user_time,
102 double* process_system_time);
104 // Interface to the performance counter
105 static jlong elapsed_counter();
106 static jlong elapsed_frequency();
108 // The "virtual time" of a thread is the amount of time a thread has
109 // actually run. The first function indicates whether the OS supports
110 // this functionality for the current thread, and if so:
111 // * the second enables vtime tracking (if that is required).
112 // * the third tells whether vtime is enabled.
113 // * the fourth returns the elapsed virtual time for the current
114 // thread.
115 static bool supports_vtime();
116 static bool enable_vtime();
117 static bool vtime_enabled();
118 static double elapsedVTime();
120 // Return current local time in a string (YYYY-MM-DD HH:MM:SS).
121 // It is MT safe, but not async-safe, as reading time zone
122 // information may require a lock on some platforms.
123 static char* local_time_string(char *buf, size_t buflen);
124 // Fill in buffer with current local time as an ISO-8601 string.
125 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz.
126 // Returns buffer, or NULL if it failed.
127 static char* iso8601_time(char* buffer, size_t buffer_length);
129 // Interface for detecting multiprocessor system
130 static inline bool is_MP() {
131 assert(_processor_count > 0, "invalid processor count");
132 return _processor_count > 1;
133 }
134 static julong available_memory();
135 static julong physical_memory();
136 static julong allocatable_physical_memory(julong size);
137 static bool is_server_class_machine();
139 // number of CPUs
140 static int processor_count() {
141 return _processor_count;
142 }
144 // Returns the number of CPUs this process is currently allowed to run on.
145 // Note that on some OSes this can change dynamically.
146 static int active_processor_count();
148 // Bind processes to processors.
149 // This is a two step procedure:
150 // first you generate a distribution of processes to processors,
151 // then you bind processes according to that distribution.
152 // Compute a distribution for number of processes to processors.
153 // Stores the processor id's into the distribution array argument.
154 // Returns true if it worked, false if it didn't.
155 static bool distribute_processes(uint length, uint* distribution);
156 // Binds the current process to a processor.
157 // Returns true if it worked, false if it didn't.
158 static bool bind_to_processor(uint processor_id);
160 // Interface for stack banging (predetect possible stack overflow for
161 // exception processing) There are guard pages, and above that shadow
162 // pages for stack overflow checking.
163 static bool uses_stack_guard_pages();
164 static bool allocate_stack_guard_pages();
165 static void bang_stack_shadow_pages();
166 static bool stack_shadow_pages_available(Thread *thread, methodHandle method);
168 // OS interface to Virtual Memory
170 // Return the default page size.
171 static int vm_page_size();
173 // Return the page size to use for a region of memory. The min_pages argument
174 // is a hint intended to limit fragmentation; it says the returned page size
175 // should be <= region_max_size / min_pages. Because min_pages is a hint,
176 // this routine may return a size larger than region_max_size / min_pages.
177 //
178 // The current implementation ignores min_pages if a larger page size is an
179 // exact multiple of both region_min_size and region_max_size. This allows
180 // larger pages to be used when doing so would not cause fragmentation; in
181 // particular, a single page can be used when region_min_size ==
182 // region_max_size == a supported page size.
183 static size_t page_size_for_region(size_t region_min_size,
184 size_t region_max_size,
185 uint min_pages);
187 // Method for tracing page sizes returned by the above method; enabled by
188 // TracePageSizes. The region_{min,max}_size parameters should be the values
189 // passed to page_size_for_region() and page_size should be the result of that
190 // call. The (optional) base and size parameters should come from the
191 // ReservedSpace base() and size() methods.
192 static void trace_page_sizes(const char* str, const size_t region_min_size,
193 const size_t region_max_size,
194 const size_t page_size,
195 const char* base = NULL,
196 const size_t size = 0) PRODUCT_RETURN;
198 static int vm_allocation_granularity();
199 static char* reserve_memory(size_t bytes, char* addr = 0,
200 size_t alignment_hint = 0);
201 static char* attempt_reserve_memory_at(size_t bytes, char* addr);
202 static void split_reserved_memory(char *base, size_t size,
203 size_t split, bool realloc);
204 static bool commit_memory(char* addr, size_t bytes);
205 static bool commit_memory(char* addr, size_t size, size_t alignment_hint);
206 static bool uncommit_memory(char* addr, size_t bytes);
207 static bool release_memory(char* addr, size_t bytes);
209 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX };
210 static bool protect_memory(char* addr, size_t bytes, ProtType prot,
211 bool is_committed = false);
213 static bool guard_memory(char* addr, size_t bytes);
214 static bool unguard_memory(char* addr, size_t bytes);
215 static char* map_memory(int fd, const char* file_name, size_t file_offset,
216 char *addr, size_t bytes, bool read_only = false,
217 bool allow_exec = false);
218 static char* remap_memory(int fd, const char* file_name, size_t file_offset,
219 char *addr, size_t bytes, bool read_only,
220 bool allow_exec);
221 static bool unmap_memory(char *addr, size_t bytes);
222 static void free_memory(char *addr, size_t bytes);
223 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint);
225 // NUMA-specific interface
226 static bool numa_has_static_binding();
227 static bool numa_has_group_homing();
228 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint);
229 static void numa_make_global(char *addr, size_t bytes);
230 static size_t numa_get_groups_num();
231 static size_t numa_get_leaf_groups(int *ids, size_t size);
232 static bool numa_topology_changed();
233 static int numa_get_group_id();
235 // Page manipulation
236 struct page_info {
237 size_t size;
238 int lgrp_id;
239 };
240 static bool get_page_info(char *start, page_info* info);
241 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found);
243 static char* non_memory_address_word();
244 // reserve, commit and pin the entire memory region
245 static char* reserve_memory_special(size_t size);
246 static bool release_memory_special(char* addr, size_t bytes);
247 static bool large_page_init();
248 static size_t large_page_size();
249 static bool can_commit_large_page_memory();
250 static bool can_execute_large_page_memory();
252 // OS interface to polling page
253 static address get_polling_page() { return _polling_page; }
254 static void set_polling_page(address page) { _polling_page = page; }
255 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); }
256 static void make_polling_page_unreadable();
257 static void make_polling_page_readable();
259 // Routines used to serialize the thread state without using membars
260 static void serialize_thread_states();
262 // Since we write to the serialize page from every thread, we
263 // want stores to be on unique cache lines whenever possible
264 // in order to minimize CPU cross talk. We pre-compute the
265 // amount to shift the thread* to make this offset unique to
266 // each thread.
267 static int get_serialize_page_shift_count() {
268 return SerializePageShiftCount;
269 }
271 static void set_serialize_page_mask(uintptr_t mask) {
272 _serialize_page_mask = mask;
273 }
275 static unsigned int get_serialize_page_mask() {
276 return _serialize_page_mask;
277 }
279 static void set_memory_serialize_page(address page);
281 static address get_memory_serialize_page() {
282 return (address)_mem_serialize_page;
283 }
285 static inline void write_memory_serialize_page(JavaThread *thread) {
286 uintptr_t page_offset = ((uintptr_t)thread >>
287 get_serialize_page_shift_count()) &
288 get_serialize_page_mask();
289 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1;
290 }
292 static bool is_memory_serialize_page(JavaThread *thread, address addr) {
293 address thr_addr;
294 if (UseMembar) return false;
295 // Calculate thread specific address
296 if (thread == NULL) return false;
297 // TODO-FIXME: some platforms mask off faulting addresses to the base pagesize.
298 // Instead of using a test for equality we should probably use something
299 // of the form:
300 // return ((_mem_serialize_page ^ addr) & -pagesize) == 0
301 //
302 thr_addr = (address)(((uintptr_t)thread >>
303 get_serialize_page_shift_count()) &
304 get_serialize_page_mask()) + (uintptr_t)_mem_serialize_page;
305 return (thr_addr == addr);
306 }
308 static void block_on_serialize_page_trap();
310 // threads
312 enum ThreadType {
313 vm_thread,
314 cgc_thread, // Concurrent GC thread
315 pgc_thread, // Parallel GC thread
316 java_thread,
317 compiler_thread,
318 watcher_thread
319 };
321 static bool create_thread(Thread* thread,
322 ThreadType thr_type,
323 size_t stack_size = 0);
324 static bool create_main_thread(JavaThread* thread);
325 static bool create_attached_thread(JavaThread* thread);
326 static void pd_start_thread(Thread* thread);
327 static void start_thread(Thread* thread);
329 static void initialize_thread();
330 static void free_thread(OSThread* osthread);
332 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit
333 static intx current_thread_id();
334 static int current_process_id();
335 // hpi::read for calls from non native state
336 // For performance, hpi::read is only callable from _thread_in_native
337 static size_t read(int fd, void *buf, unsigned int nBytes);
338 static int sleep(Thread* thread, jlong ms, bool interruptable);
339 static int naked_sleep();
340 static void infinite_sleep(); // never returns, use with CAUTION
341 static void yield(); // Yields to all threads with same priority
342 enum YieldResult {
343 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran
344 YIELD_NONEREADY = 0, // No other runnable/ready threads.
345 // platform-specific yield return immediately
346 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY
347 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong"
348 // yield that can be used in lieu of blocking.
349 } ;
350 static YieldResult NakedYield () ;
351 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority
352 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing
353 static OSReturn set_priority(Thread* thread, ThreadPriority priority);
354 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority);
356 static void interrupt(Thread* thread);
357 static bool is_interrupted(Thread* thread, bool clear_interrupted);
359 static int pd_self_suspend_thread(Thread* thread);
361 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp);
362 static frame fetch_frame_from_context(void* ucVoid);
364 static ExtendedPC get_thread_pc(Thread *thread);
365 static void breakpoint();
367 static address current_stack_pointer();
368 static address current_stack_base();
369 static size_t current_stack_size();
371 static int message_box(const char* title, const char* message);
372 static char* do_you_want_to_debug(const char* message);
374 // run cmd in a separate process and return its exit code; or -1 on failures
375 static int fork_and_exec(char *cmd);
377 // Set file to send error reports.
378 static void set_error_file(const char *logfile);
380 // os::exit() is merged with vm_exit()
381 // static void exit(int num);
383 // Terminate the VM, but don't exit the process
384 static void shutdown();
386 // Terminate with an error. Default is to generate a core file on platforms
387 // that support such things. This calls shutdown() and then aborts.
388 static void abort(bool dump_core = true);
390 // Die immediately, no exit hook, no abort hook, no cleanup.
391 static void die();
393 // Reading directories.
394 static DIR* opendir(const char* dirname);
395 static int readdir_buf_size(const char *path);
396 static struct dirent* readdir(DIR* dirp, dirent* dbuf);
397 static int closedir(DIR* dirp);
399 // Dynamic library extension
400 static const char* dll_file_extension();
402 static const char* get_temp_directory();
403 static const char* get_current_directory(char *buf, int buflen);
405 // Builds a platform-specific full library path given a ld path and lib name
406 static void dll_build_name(char* buffer, size_t size,
407 const char* pathname, const char* fname);
409 // Symbol lookup, find nearest function name; basically it implements
410 // dladdr() for all platforms. Name of the nearest function is copied
411 // to buf. Distance from its base address is returned as offset.
412 // If function name is not found, buf[0] is set to '\0' and offset is
413 // set to -1.
414 static bool dll_address_to_function_name(address addr, char* buf,
415 int buflen, int* offset);
417 // Locate DLL/DSO. On success, full path of the library is copied to
418 // buf, and offset is set to be the distance between addr and the
419 // library's base address. On failure, buf[0] is set to '\0' and
420 // offset is set to -1.
421 static bool dll_address_to_library_name(address addr, char* buf,
422 int buflen, int* offset);
424 // Find out whether the pc is in the static code for jvm.dll/libjvm.so.
425 static bool address_is_in_vm(address addr);
427 // Loads .dll/.so and
428 // in case of error it checks if .dll/.so was built for the
429 // same architecture as Hotspot is running on
430 static void* dll_load(const char *name, char *ebuf, int ebuflen);
432 // lookup symbol in a shared library
433 static void* dll_lookup(void* handle, const char* name);
435 // Print out system information; they are called by fatal error handler.
436 // Output format may be different on different platforms.
437 static void print_os_info(outputStream* st);
438 static void print_cpu_info(outputStream* st);
439 static void print_memory_info(outputStream* st);
440 static void print_dll_info(outputStream* st);
441 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len);
442 static void print_context(outputStream* st, void* context);
443 static void print_siginfo(outputStream* st, void* siginfo);
444 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
445 static void print_date_and_time(outputStream* st);
447 // The following two functions are used by fatal error handler to trace
448 // native (C) frames. They are not part of frame.hpp/frame.cpp because
449 // frame.hpp/cpp assume thread is JavaThread, and also because different
450 // OS/compiler may have different convention or provide different API to
451 // walk C frames.
452 //
453 // We don't attempt to become a debugger, so we only follow frames if that
454 // does not require a lookup in the unwind table, which is part of the binary
455 // file but may be unsafe to read after a fatal error. So on x86, we can
456 // only walk stack if %ebp is used as frame pointer; on ia64, it's not
457 // possible to walk C stack without having the unwind table.
458 static bool is_first_C_frame(frame *fr);
459 static frame get_sender_for_C_frame(frame *fr);
461 // return current frame. pc() and sp() are set to NULL on failure.
462 static frame current_frame();
464 static void print_hex_dump(outputStream* st, address start, address end, int unitsize);
466 // returns a string to describe the exception/signal;
467 // returns NULL if exception_code is not an OS exception/signal.
468 static const char* exception_name(int exception_code, char* buf, size_t buflen);
470 // Returns native Java library, loads if necessary
471 static void* native_java_library();
473 // Fills in path to jvm.dll/libjvm.so (this info used to find hpi).
474 static void jvm_path(char *buf, jint buflen);
476 // JNI names
477 static void print_jni_name_prefix_on(outputStream* st, int args_size);
478 static void print_jni_name_suffix_on(outputStream* st, int args_size);
480 // File conventions
481 static const char* file_separator();
482 static const char* line_separator();
483 static const char* path_separator();
485 // Init os specific system properties values
486 static void init_system_properties_values();
488 // IO operations, non-JVM_ version.
489 static int stat(const char* path, struct stat* sbuf);
490 static bool dir_is_empty(const char* path);
492 // IO operations on binary files
493 static int create_binary_file(const char* path, bool rewrite_existing);
494 static jlong current_file_offset(int fd);
495 static jlong seek_to_file_offset(int fd, jlong offset);
497 // Thread Local Storage
498 static int allocate_thread_local_storage();
499 static void thread_local_storage_at_put(int index, void* value);
500 static void* thread_local_storage_at(int index);
501 static void free_thread_local_storage(int index);
503 // General allocation (must be MT-safe)
504 static void* malloc (size_t size);
505 static void* realloc (void *memblock, size_t size);
506 static void free (void *memblock);
507 static bool check_heap(bool force = false); // verify C heap integrity
508 static char* strdup(const char *); // Like strdup
510 #ifndef PRODUCT
511 static int num_mallocs; // # of calls to malloc/realloc
512 static size_t alloc_bytes; // # of bytes allocated
513 static int num_frees; // # of calls to free
514 #endif
516 // Printing 64 bit integers
517 static const char* jlong_format_specifier();
518 static const char* julong_format_specifier();
520 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal)
521 static void signal_init();
522 static void signal_init_pd();
523 static void signal_notify(int signal_number);
524 static void* signal(int signal_number, void* handler);
525 static void signal_raise(int signal_number);
526 static int signal_wait();
527 static int signal_lookup();
528 static void* user_handler();
529 static void terminate_signal_thread();
530 static int sigexitnum_pd();
532 // random number generation
533 static long random(); // return 32bit pseudorandom number
534 static void init_random(long initval); // initialize random sequence
536 // Structured OS Exception support
537 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
539 // JVMTI & JVM monitoring and management support
540 // The thread_cpu_time() and current_thread_cpu_time() are only
541 // supported if is_thread_cpu_time_supported() returns true.
542 // They are not supported on Solaris T1.
544 // Thread CPU Time - return the fast estimate on a platform
545 // On Solaris - call gethrvtime (fast) - user time only
546 // On Linux - fast clock_gettime where available - user+sys
547 // - otherwise: very slow /proc fs - user+sys
548 // On Windows - GetThreadTimes - user+sys
549 static jlong current_thread_cpu_time();
550 static jlong thread_cpu_time(Thread* t);
552 // Thread CPU Time with user_sys_cpu_time parameter.
553 //
554 // If user_sys_cpu_time is true, user+sys time is returned.
555 // Otherwise, only user time is returned
556 static jlong current_thread_cpu_time(bool user_sys_cpu_time);
557 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time);
559 // Return a bunch of info about the timers.
560 // Note that the returned info for these two functions may be different
561 // on some platforms
562 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
563 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
565 static bool is_thread_cpu_time_supported();
567 // System loadavg support. Returns -1 if load average cannot be obtained.
568 static int loadavg(double loadavg[], int nelem);
570 // Hook for os specific jvm options that we don't want to abort on seeing
571 static bool obsolete_option(const JavaVMOption *option);
573 // Platform dependent stuff
574 #include "incls/_os_pd.hpp.incl"
576 // debugging support (mostly used by debug.cpp)
577 static bool find(address pc) PRODUCT_RETURN0; // OS specific function to make sense out of an address
579 static bool dont_yield(); // when true, JVM_Yield() is nop
580 static void print_statistics();
582 // Thread priority helpers (implemented in OS-specific part)
583 static OSReturn set_native_priority(Thread* thread, int native_prio);
584 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr);
585 static int java_to_os_priority[MaxPriority + 1];
586 // Hint to the underlying OS that a task switch would not be good.
587 // Void return because it's a hint and can fail.
588 static void hint_no_preempt();
590 // Used at creation if requested by the diagnostic flag PauseAtStartup.
591 // Causes the VM to wait until an external stimulus has been applied
592 // (for Unix, that stimulus is a signal, for Windows, an external
593 // ResumeThread call)
594 static void pause();
596 protected:
597 static long _rand_seed; // seed for random number generator
598 static int _processor_count; // number of processors
600 static char* format_boot_path(const char* format_string,
601 const char* home,
602 int home_len,
603 char fileSep,
604 char pathSep);
605 static bool set_boot_path(char fileSep, char pathSep);
606 };
608 // Note that "PAUSE" is almost always used with synchronization
609 // so arguably we should provide Atomic::SpinPause() instead
610 // of the global SpinPause() with C linkage.
611 // It'd also be eligible for inlining on many platforms.
613 extern "C" int SpinPause () ;
614 extern "C" int SafeFetch32 (int * adr, int errValue) ;
615 extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t errValue) ;