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rev 4499 : 8013120: NMT: Kitchensink crashes with assert(next_region == NULL || !next_region->is_committed_region()) failed: Sanity check
Summary: Fixed NMT to deal with releasing virtual memory region when there are still committed regions within it
Reviewed-by: acorn, coleenp
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--- old/src/share/vm/runtime/os.hpp
+++ new/src/share/vm/runtime/os.hpp
1 1 /*
2 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 4 *
5 5 * This code is free software; you can redistribute it and/or modify it
6 6 * under the terms of the GNU General Public License version 2 only, as
7 7 * published by the Free Software Foundation.
8 8 *
9 9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 12 * version 2 for more details (a copy is included in the LICENSE file that
13 13 * accompanied this code).
14 14 *
15 15 * You should have received a copy of the GNU General Public License version
16 16 * 2 along with this work; if not, write to the Free Software Foundation,
17 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 18 *
19 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 20 * or visit www.oracle.com if you need additional information or have any
21 21 * questions.
22 22 *
23 23 */
24 24
25 25 #ifndef SHARE_VM_RUNTIME_OS_HPP
26 26 #define SHARE_VM_RUNTIME_OS_HPP
27 27
28 28 #include "jvmtifiles/jvmti.h"
29 29 #include "runtime/atomic.hpp"
30 30 #include "runtime/extendedPC.hpp"
31 31 #include "runtime/handles.hpp"
32 32 #include "utilities/top.hpp"
33 33 #ifdef TARGET_OS_FAMILY_linux
34 34 # include "jvm_linux.h"
35 35 #endif
36 36 #ifdef TARGET_OS_FAMILY_solaris
37 37 # include "jvm_solaris.h"
38 38 #endif
39 39 #ifdef TARGET_OS_FAMILY_windows
40 40 # include "jvm_windows.h"
41 41 #endif
42 42 #ifdef TARGET_OS_FAMILY_bsd
43 43 # include "jvm_bsd.h"
44 44 #endif
45 45
46 46 // os defines the interface to operating system; this includes traditional
47 47 // OS services (time, I/O) as well as other functionality with system-
48 48 // dependent code.
49 49
50 50 typedef void (*dll_func)(...);
51 51
52 52 class Thread;
53 53 class JavaThread;
54 54 class Event;
55 55 class DLL;
56 56 class FileHandle;
57 57 template<class E> class GrowableArray;
58 58
59 59 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose
60 60
61 61 // Platform-independent error return values from OS functions
62 62 enum OSReturn {
63 63 OS_OK = 0, // Operation was successful
64 64 OS_ERR = -1, // Operation failed
65 65 OS_INTRPT = -2, // Operation was interrupted
66 66 OS_TIMEOUT = -3, // Operation timed out
67 67 OS_NOMEM = -5, // Operation failed for lack of memory
68 68 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource
69 69 };
70 70
71 71 enum ThreadPriority { // JLS 20.20.1-3
72 72 NoPriority = -1, // Initial non-priority value
73 73 MinPriority = 1, // Minimum priority
74 74 NormPriority = 5, // Normal (non-daemon) priority
75 75 NearMaxPriority = 9, // High priority, used for VMThread
76 76 MaxPriority = 10, // Highest priority, used for WatcherThread
77 77 // ensures that VMThread doesn't starve profiler
78 78 CriticalPriority = 11 // Critical thread priority
79 79 };
80 80
81 81 // Typedef for structured exception handling support
82 82 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
83 83
84 84 class os: AllStatic {
85 85 public:
86 86 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel)
87 87
88 88 private:
89 89 static OSThread* _starting_thread;
90 90 static address _polling_page;
91 91 static volatile int32_t * _mem_serialize_page;
92 92 static uintptr_t _serialize_page_mask;
93 93 public:
94 94 static size_t _page_sizes[page_sizes_max];
95 95
96 96 private:
97 97 static void init_page_sizes(size_t default_page_size) {
98 98 _page_sizes[0] = default_page_size;
99 99 _page_sizes[1] = 0; // sentinel
100 100 }
101 101
102 102 static char* pd_reserve_memory(size_t bytes, char* addr = 0,
103 103 size_t alignment_hint = 0);
104 104 static char* pd_attempt_reserve_memory_at(size_t bytes, char* addr);
105 105 static void pd_split_reserved_memory(char *base, size_t size,
106 106 size_t split, bool realloc);
107 107 static bool pd_commit_memory(char* addr, size_t bytes, bool executable = false);
108 108 static bool pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
109 109 bool executable = false);
110 110 static bool pd_uncommit_memory(char* addr, size_t bytes);
111 111 static bool pd_release_memory(char* addr, size_t bytes);
112 112
113 113 static char* pd_map_memory(int fd, const char* file_name, size_t file_offset,
114 114 char *addr, size_t bytes, bool read_only = false,
115 115 bool allow_exec = false);
116 116 static char* pd_remap_memory(int fd, const char* file_name, size_t file_offset,
117 117 char *addr, size_t bytes, bool read_only,
118 118 bool allow_exec);
119 119 static bool pd_unmap_memory(char *addr, size_t bytes);
120 120 static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint);
121 121 static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint);
122 122
123 123
124 124 public:
125 125 static void init(void); // Called before command line parsing
126 126 static jint init_2(void); // Called after command line parsing
127 127 static void init_globals(void) { // Called from init_globals() in init.cpp
128 128 init_globals_ext();
129 129 }
130 130 static void init_3(void); // Called at the end of vm init
131 131
132 132 // File names are case-insensitive on windows only
133 133 // Override me as needed
134 134 static int file_name_strcmp(const char* s1, const char* s2);
135 135
136 136 static bool getenv(const char* name, char* buffer, int len);
137 137 static bool have_special_privileges();
138 138
139 139 static jlong javaTimeMillis();
140 140 static jlong javaTimeNanos();
141 141 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr);
142 142 static void run_periodic_checks();
143 143
144 144
145 145 // Returns the elapsed time in seconds since the vm started.
146 146 static double elapsedTime();
147 147
148 148 // Returns real time in seconds since an arbitrary point
149 149 // in the past.
150 150 static bool getTimesSecs(double* process_real_time,
151 151 double* process_user_time,
152 152 double* process_system_time);
153 153
154 154 // Interface to the performance counter
155 155 static jlong elapsed_counter();
156 156 static jlong elapsed_frequency();
157 157
158 158 // The "virtual time" of a thread is the amount of time a thread has
159 159 // actually run. The first function indicates whether the OS supports
160 160 // this functionality for the current thread, and if so:
161 161 // * the second enables vtime tracking (if that is required).
162 162 // * the third tells whether vtime is enabled.
163 163 // * the fourth returns the elapsed virtual time for the current
164 164 // thread.
165 165 static bool supports_vtime();
166 166 static bool enable_vtime();
167 167 static bool vtime_enabled();
168 168 static double elapsedVTime();
169 169
170 170 // Return current local time in a string (YYYY-MM-DD HH:MM:SS).
171 171 // It is MT safe, but not async-safe, as reading time zone
172 172 // information may require a lock on some platforms.
173 173 static char* local_time_string(char *buf, size_t buflen);
174 174 static struct tm* localtime_pd (const time_t* clock, struct tm* res);
175 175 // Fill in buffer with current local time as an ISO-8601 string.
176 176 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz.
177 177 // Returns buffer, or NULL if it failed.
178 178 static char* iso8601_time(char* buffer, size_t buffer_length);
179 179
180 180 // Interface for detecting multiprocessor system
181 181 static inline bool is_MP() {
182 182 assert(_processor_count > 0, "invalid processor count");
183 183 return _processor_count > 1;
184 184 }
185 185 static julong available_memory();
186 186 static julong physical_memory();
187 187 static julong allocatable_physical_memory(julong size);
188 188 static bool is_server_class_machine();
189 189
190 190 // number of CPUs
191 191 static int processor_count() {
192 192 return _processor_count;
193 193 }
194 194 static void set_processor_count(int count) { _processor_count = count; }
195 195
196 196 // Returns the number of CPUs this process is currently allowed to run on.
197 197 // Note that on some OSes this can change dynamically.
198 198 static int active_processor_count();
199 199
200 200 // Bind processes to processors.
201 201 // This is a two step procedure:
202 202 // first you generate a distribution of processes to processors,
203 203 // then you bind processes according to that distribution.
204 204 // Compute a distribution for number of processes to processors.
205 205 // Stores the processor id's into the distribution array argument.
206 206 // Returns true if it worked, false if it didn't.
207 207 static bool distribute_processes(uint length, uint* distribution);
208 208 // Binds the current process to a processor.
209 209 // Returns true if it worked, false if it didn't.
210 210 static bool bind_to_processor(uint processor_id);
211 211
212 212 // Give a name to the current thread.
213 213 static void set_native_thread_name(const char *name);
214 214
215 215 // Interface for stack banging (predetect possible stack overflow for
216 216 // exception processing) There are guard pages, and above that shadow
217 217 // pages for stack overflow checking.
218 218 static bool uses_stack_guard_pages();
219 219 static bool allocate_stack_guard_pages();
220 220 static void bang_stack_shadow_pages();
221 221 static bool stack_shadow_pages_available(Thread *thread, methodHandle method);
222 222
223 223 // OS interface to Virtual Memory
224 224
225 225 // Return the default page size.
226 226 static int vm_page_size();
227 227
228 228 // Return the page size to use for a region of memory. The min_pages argument
229 229 // is a hint intended to limit fragmentation; it says the returned page size
230 230 // should be <= region_max_size / min_pages. Because min_pages is a hint,
231 231 // this routine may return a size larger than region_max_size / min_pages.
232 232 //
233 233 // The current implementation ignores min_pages if a larger page size is an
234 234 // exact multiple of both region_min_size and region_max_size. This allows
235 235 // larger pages to be used when doing so would not cause fragmentation; in
236 236 // particular, a single page can be used when region_min_size ==
237 237 // region_max_size == a supported page size.
238 238 static size_t page_size_for_region(size_t region_min_size,
239 239 size_t region_max_size,
240 240 uint min_pages);
241 241
242 242 // Methods for tracing page sizes returned by the above method; enabled by
243 243 // TracePageSizes. The region_{min,max}_size parameters should be the values
244 244 // passed to page_size_for_region() and page_size should be the result of that
245 245 // call. The (optional) base and size parameters should come from the
246 246 // ReservedSpace base() and size() methods.
247 247 static void trace_page_sizes(const char* str, const size_t* page_sizes,
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248 248 int count) PRODUCT_RETURN;
249 249 static void trace_page_sizes(const char* str, const size_t region_min_size,
250 250 const size_t region_max_size,
251 251 const size_t page_size,
252 252 const char* base = NULL,
253 253 const size_t size = 0) PRODUCT_RETURN;
254 254
255 255 static int vm_allocation_granularity();
256 256 static char* reserve_memory(size_t bytes, char* addr = 0,
257 257 size_t alignment_hint = 0);
258 + static char* reserve_memory(size_t bytes, char* addr,
259 + size_t alignment_hint, MEMFLAGS flags);
258 260 static char* reserve_memory_aligned(size_t size, size_t alignment);
259 261 static char* attempt_reserve_memory_at(size_t bytes, char* addr);
260 262 static void split_reserved_memory(char *base, size_t size,
261 263 size_t split, bool realloc);
262 264 static bool commit_memory(char* addr, size_t bytes, bool executable = false);
263 265 static bool commit_memory(char* addr, size_t size, size_t alignment_hint,
264 266 bool executable = false);
265 267 static bool uncommit_memory(char* addr, size_t bytes);
266 268 static bool release_memory(char* addr, size_t bytes);
267 269
268 270 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX };
269 271 static bool protect_memory(char* addr, size_t bytes, ProtType prot,
270 272 bool is_committed = true);
271 273
272 274 static bool guard_memory(char* addr, size_t bytes);
273 275 static bool unguard_memory(char* addr, size_t bytes);
274 276 static bool create_stack_guard_pages(char* addr, size_t bytes);
275 277 static bool pd_create_stack_guard_pages(char* addr, size_t bytes);
276 278 static bool remove_stack_guard_pages(char* addr, size_t bytes);
277 279
278 280 static char* map_memory(int fd, const char* file_name, size_t file_offset,
279 281 char *addr, size_t bytes, bool read_only = false,
280 282 bool allow_exec = false);
281 283 static char* remap_memory(int fd, const char* file_name, size_t file_offset,
282 284 char *addr, size_t bytes, bool read_only,
283 285 bool allow_exec);
284 286 static bool unmap_memory(char *addr, size_t bytes);
285 287 static void free_memory(char *addr, size_t bytes, size_t alignment_hint);
286 288 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint);
287 289
288 290 // NUMA-specific interface
289 291 static bool numa_has_static_binding();
290 292 static bool numa_has_group_homing();
291 293 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint);
292 294 static void numa_make_global(char *addr, size_t bytes);
293 295 static size_t numa_get_groups_num();
294 296 static size_t numa_get_leaf_groups(int *ids, size_t size);
295 297 static bool numa_topology_changed();
296 298 static int numa_get_group_id();
297 299
298 300 // Page manipulation
299 301 struct page_info {
300 302 size_t size;
301 303 int lgrp_id;
302 304 };
303 305 static bool get_page_info(char *start, page_info* info);
304 306 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found);
305 307
306 308 static char* non_memory_address_word();
307 309 // reserve, commit and pin the entire memory region
308 310 static char* reserve_memory_special(size_t size, char* addr = NULL,
309 311 bool executable = false);
310 312 static bool release_memory_special(char* addr, size_t bytes);
311 313 static void large_page_init();
312 314 static size_t large_page_size();
313 315 static bool can_commit_large_page_memory();
314 316 static bool can_execute_large_page_memory();
315 317
316 318 // OS interface to polling page
317 319 static address get_polling_page() { return _polling_page; }
318 320 static void set_polling_page(address page) { _polling_page = page; }
319 321 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); }
320 322 static void make_polling_page_unreadable();
321 323 static void make_polling_page_readable();
322 324
323 325 // Routines used to serialize the thread state without using membars
324 326 static void serialize_thread_states();
325 327
326 328 // Since we write to the serialize page from every thread, we
327 329 // want stores to be on unique cache lines whenever possible
328 330 // in order to minimize CPU cross talk. We pre-compute the
329 331 // amount to shift the thread* to make this offset unique to
330 332 // each thread.
331 333 static int get_serialize_page_shift_count() {
332 334 return SerializePageShiftCount;
333 335 }
334 336
335 337 static void set_serialize_page_mask(uintptr_t mask) {
336 338 _serialize_page_mask = mask;
337 339 }
338 340
339 341 static unsigned int get_serialize_page_mask() {
340 342 return _serialize_page_mask;
341 343 }
342 344
343 345 static void set_memory_serialize_page(address page);
344 346
345 347 static address get_memory_serialize_page() {
346 348 return (address)_mem_serialize_page;
347 349 }
348 350
349 351 static inline void write_memory_serialize_page(JavaThread *thread) {
350 352 uintptr_t page_offset = ((uintptr_t)thread >>
351 353 get_serialize_page_shift_count()) &
352 354 get_serialize_page_mask();
353 355 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1;
354 356 }
355 357
356 358 static bool is_memory_serialize_page(JavaThread *thread, address addr) {
357 359 if (UseMembar) return false;
358 360 // Previously this function calculated the exact address of this
359 361 // thread's serialize page, and checked if the faulting address
360 362 // was equal. However, some platforms mask off faulting addresses
361 363 // to the page size, so now we just check that the address is
362 364 // within the page. This makes the thread argument unnecessary,
363 365 // but we retain the NULL check to preserve existing behaviour.
364 366 if (thread == NULL) return false;
365 367 address page = (address) _mem_serialize_page;
366 368 return addr >= page && addr < (page + os::vm_page_size());
367 369 }
368 370
369 371 static void block_on_serialize_page_trap();
370 372
371 373 // threads
372 374
373 375 enum ThreadType {
374 376 vm_thread,
375 377 cgc_thread, // Concurrent GC thread
376 378 pgc_thread, // Parallel GC thread
377 379 java_thread,
378 380 compiler_thread,
379 381 watcher_thread,
380 382 os_thread
381 383 };
382 384
383 385 static bool create_thread(Thread* thread,
384 386 ThreadType thr_type,
385 387 size_t stack_size = 0);
386 388 static bool create_main_thread(JavaThread* thread);
387 389 static bool create_attached_thread(JavaThread* thread);
388 390 static void pd_start_thread(Thread* thread);
389 391 static void start_thread(Thread* thread);
390 392
391 393 static void initialize_thread(Thread* thr);
392 394 static void free_thread(OSThread* osthread);
393 395
394 396 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit
395 397 static intx current_thread_id();
396 398 static int current_process_id();
397 399 static int sleep(Thread* thread, jlong ms, bool interruptable);
398 400 static int naked_sleep();
399 401 static void infinite_sleep(); // never returns, use with CAUTION
400 402 static void yield(); // Yields to all threads with same priority
401 403 enum YieldResult {
402 404 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran
403 405 YIELD_NONEREADY = 0, // No other runnable/ready threads.
404 406 // platform-specific yield return immediately
405 407 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY
406 408 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong"
407 409 // yield that can be used in lieu of blocking.
408 410 } ;
409 411 static YieldResult NakedYield () ;
410 412 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority
411 413 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing
412 414 static OSReturn set_priority(Thread* thread, ThreadPriority priority);
413 415 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority);
414 416
415 417 static void interrupt(Thread* thread);
416 418 static bool is_interrupted(Thread* thread, bool clear_interrupted);
417 419
418 420 static int pd_self_suspend_thread(Thread* thread);
419 421
420 422 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp);
421 423 static frame fetch_frame_from_context(void* ucVoid);
422 424
423 425 static ExtendedPC get_thread_pc(Thread *thread);
424 426 static void breakpoint();
425 427
426 428 static address current_stack_pointer();
427 429 static address current_stack_base();
428 430 static size_t current_stack_size();
429 431
430 432 static void verify_stack_alignment() PRODUCT_RETURN;
431 433
432 434 static int message_box(const char* title, const char* message);
433 435 static char* do_you_want_to_debug(const char* message);
434 436
435 437 // run cmd in a separate process and return its exit code; or -1 on failures
436 438 static int fork_and_exec(char *cmd);
437 439
438 440 // Set file to send error reports.
439 441 static void set_error_file(const char *logfile);
440 442
441 443 // os::exit() is merged with vm_exit()
442 444 // static void exit(int num);
443 445
444 446 // Terminate the VM, but don't exit the process
445 447 static void shutdown();
446 448
447 449 // Terminate with an error. Default is to generate a core file on platforms
448 450 // that support such things. This calls shutdown() and then aborts.
449 451 static void abort(bool dump_core = true);
450 452
451 453 // Die immediately, no exit hook, no abort hook, no cleanup.
452 454 static void die();
453 455
454 456 // File i/o operations
455 457 static const int default_file_open_flags();
456 458 static int open(const char *path, int oflag, int mode);
457 459 static int close(int fd);
458 460 static jlong lseek(int fd, jlong offset, int whence);
459 461 static char* native_path(char *path);
460 462 static int ftruncate(int fd, jlong length);
461 463 static int fsync(int fd);
462 464 static int available(int fd, jlong *bytes);
463 465
464 466 //File i/o operations
465 467
466 468 static size_t read(int fd, void *buf, unsigned int nBytes);
467 469 static size_t restartable_read(int fd, void *buf, unsigned int nBytes);
468 470 static size_t write(int fd, const void *buf, unsigned int nBytes);
469 471
470 472 // Reading directories.
471 473 static DIR* opendir(const char* dirname);
472 474 static int readdir_buf_size(const char *path);
473 475 static struct dirent* readdir(DIR* dirp, dirent* dbuf);
474 476 static int closedir(DIR* dirp);
475 477
476 478 // Dynamic library extension
477 479 static const char* dll_file_extension();
478 480
479 481 static const char* get_temp_directory();
480 482 static const char* get_current_directory(char *buf, int buflen);
481 483
482 484 // Builds a platform-specific full library path given a ld path and lib name
483 485 static void dll_build_name(char* buffer, size_t size,
484 486 const char* pathname, const char* fname);
485 487
486 488 // Symbol lookup, find nearest function name; basically it implements
487 489 // dladdr() for all platforms. Name of the nearest function is copied
488 490 // to buf. Distance from its base address is returned as offset.
489 491 // If function name is not found, buf[0] is set to '\0' and offset is
490 492 // set to -1.
491 493 static bool dll_address_to_function_name(address addr, char* buf,
492 494 int buflen, int* offset);
493 495
494 496 // Locate DLL/DSO. On success, full path of the library is copied to
495 497 // buf, and offset is set to be the distance between addr and the
496 498 // library's base address. On failure, buf[0] is set to '\0' and
497 499 // offset is set to -1.
498 500 static bool dll_address_to_library_name(address addr, char* buf,
499 501 int buflen, int* offset);
500 502
501 503 // Find out whether the pc is in the static code for jvm.dll/libjvm.so.
502 504 static bool address_is_in_vm(address addr);
503 505
504 506 // Loads .dll/.so and
505 507 // in case of error it checks if .dll/.so was built for the
506 508 // same architecture as Hotspot is running on
507 509 static void* dll_load(const char *name, char *ebuf, int ebuflen);
508 510
509 511 // lookup symbol in a shared library
510 512 static void* dll_lookup(void* handle, const char* name);
511 513
512 514 // Unload library
513 515 static void dll_unload(void *lib);
514 516
515 517 // Print out system information; they are called by fatal error handler.
516 518 // Output format may be different on different platforms.
517 519 static void print_os_info(outputStream* st);
518 520 static void print_os_info_brief(outputStream* st);
519 521 static void print_cpu_info(outputStream* st);
520 522 static void pd_print_cpu_info(outputStream* st);
521 523 static void print_memory_info(outputStream* st);
522 524 static void print_dll_info(outputStream* st);
523 525 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len);
524 526 static void print_context(outputStream* st, void* context);
525 527 static void print_register_info(outputStream* st, void* context);
526 528 static void print_siginfo(outputStream* st, void* siginfo);
527 529 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
528 530 static void print_date_and_time(outputStream* st);
529 531
530 532 static void print_location(outputStream* st, intptr_t x, bool verbose = false);
531 533 static size_t lasterror(char *buf, size_t len);
532 534 static int get_last_error();
533 535
534 536 // Determines whether the calling process is being debugged by a user-mode debugger.
535 537 static bool is_debugger_attached();
536 538
537 539 // wait for a key press if PauseAtExit is set
538 540 static void wait_for_keypress_at_exit(void);
539 541
540 542 // The following two functions are used by fatal error handler to trace
541 543 // native (C) frames. They are not part of frame.hpp/frame.cpp because
542 544 // frame.hpp/cpp assume thread is JavaThread, and also because different
543 545 // OS/compiler may have different convention or provide different API to
544 546 // walk C frames.
545 547 //
546 548 // We don't attempt to become a debugger, so we only follow frames if that
547 549 // does not require a lookup in the unwind table, which is part of the binary
548 550 // file but may be unsafe to read after a fatal error. So on x86, we can
549 551 // only walk stack if %ebp is used as frame pointer; on ia64, it's not
550 552 // possible to walk C stack without having the unwind table.
551 553 static bool is_first_C_frame(frame *fr);
552 554 static frame get_sender_for_C_frame(frame *fr);
553 555
554 556 // return current frame. pc() and sp() are set to NULL on failure.
555 557 static frame current_frame();
556 558
557 559 static void print_hex_dump(outputStream* st, address start, address end, int unitsize);
558 560
559 561 // returns a string to describe the exception/signal;
560 562 // returns NULL if exception_code is not an OS exception/signal.
561 563 static const char* exception_name(int exception_code, char* buf, size_t buflen);
562 564
563 565 // Returns native Java library, loads if necessary
564 566 static void* native_java_library();
565 567
566 568 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler)
567 569 static void jvm_path(char *buf, jint buflen);
568 570
569 571 // Returns true if we are running in a headless jre.
570 572 static bool is_headless_jre();
571 573
572 574 // JNI names
573 575 static void print_jni_name_prefix_on(outputStream* st, int args_size);
574 576 static void print_jni_name_suffix_on(outputStream* st, int args_size);
575 577
576 578 // File conventions
577 579 static const char* file_separator();
578 580 static const char* line_separator();
579 581 static const char* path_separator();
580 582
581 583 // Init os specific system properties values
582 584 static void init_system_properties_values();
583 585
584 586 // IO operations, non-JVM_ version.
585 587 static int stat(const char* path, struct stat* sbuf);
586 588 static bool dir_is_empty(const char* path);
587 589
588 590 // IO operations on binary files
589 591 static int create_binary_file(const char* path, bool rewrite_existing);
590 592 static jlong current_file_offset(int fd);
591 593 static jlong seek_to_file_offset(int fd, jlong offset);
592 594
593 595 // Thread Local Storage
594 596 static int allocate_thread_local_storage();
595 597 static void thread_local_storage_at_put(int index, void* value);
596 598 static void* thread_local_storage_at(int index);
597 599 static void free_thread_local_storage(int index);
598 600
599 601 // Stack walk
600 602 static address get_caller_pc(int n = 0);
601 603
602 604 // General allocation (must be MT-safe)
603 605 static void* malloc (size_t size, MEMFLAGS flags, address caller_pc = 0);
604 606 static void* realloc (void *memblock, size_t size, MEMFLAGS flags, address caller_pc = 0);
605 607 static void free (void *memblock, MEMFLAGS flags = mtNone);
606 608 static bool check_heap(bool force = false); // verify C heap integrity
607 609 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup
608 610
609 611 #ifndef PRODUCT
610 612 static julong num_mallocs; // # of calls to malloc/realloc
611 613 static julong alloc_bytes; // # of bytes allocated
612 614 static julong num_frees; // # of calls to free
613 615 static julong free_bytes; // # of bytes freed
614 616 #endif
615 617
616 618 // SocketInterface (ex HPI SocketInterface )
617 619 static int socket(int domain, int type, int protocol);
618 620 static int socket_close(int fd);
619 621 static int socket_shutdown(int fd, int howto);
620 622 static int recv(int fd, char* buf, size_t nBytes, uint flags);
621 623 static int send(int fd, char* buf, size_t nBytes, uint flags);
622 624 static int raw_send(int fd, char* buf, size_t nBytes, uint flags);
623 625 static int timeout(int fd, long timeout);
624 626 static int listen(int fd, int count);
625 627 static int connect(int fd, struct sockaddr* him, socklen_t len);
626 628 static int bind(int fd, struct sockaddr* him, socklen_t len);
627 629 static int accept(int fd, struct sockaddr* him, socklen_t* len);
628 630 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags,
629 631 struct sockaddr* from, socklen_t* fromlen);
630 632 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len);
631 633 static int sendto(int fd, char* buf, size_t len, uint flags,
632 634 struct sockaddr* to, socklen_t tolen);
633 635 static int socket_available(int fd, jint* pbytes);
634 636
635 637 static int get_sock_opt(int fd, int level, int optname,
636 638 char* optval, socklen_t* optlen);
637 639 static int set_sock_opt(int fd, int level, int optname,
638 640 const char* optval, socklen_t optlen);
639 641 static int get_host_name(char* name, int namelen);
640 642
641 643 static struct hostent* get_host_by_name(char* name);
642 644
643 645 // Printing 64 bit integers
644 646 static const char* jlong_format_specifier();
645 647 static const char* julong_format_specifier();
646 648
647 649 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal)
648 650 static void signal_init();
649 651 static void signal_init_pd();
650 652 static void signal_notify(int signal_number);
651 653 static void* signal(int signal_number, void* handler);
652 654 static void signal_raise(int signal_number);
653 655 static int signal_wait();
654 656 static int signal_lookup();
655 657 static void* user_handler();
656 658 static void terminate_signal_thread();
657 659 static int sigexitnum_pd();
658 660
659 661 // random number generation
660 662 static long random(); // return 32bit pseudorandom number
661 663 static void init_random(long initval); // initialize random sequence
662 664
663 665 // Structured OS Exception support
664 666 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
665 667
666 668 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits
667 669 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize);
668 670
669 671 // Get the default path to the core file
670 672 // Returns the length of the string
671 673 static int get_core_path(char* buffer, size_t bufferSize);
672 674
673 675 // JVMTI & JVM monitoring and management support
674 676 // The thread_cpu_time() and current_thread_cpu_time() are only
675 677 // supported if is_thread_cpu_time_supported() returns true.
676 678 // They are not supported on Solaris T1.
677 679
678 680 // Thread CPU Time - return the fast estimate on a platform
679 681 // On Solaris - call gethrvtime (fast) - user time only
680 682 // On Linux - fast clock_gettime where available - user+sys
681 683 // - otherwise: very slow /proc fs - user+sys
682 684 // On Windows - GetThreadTimes - user+sys
683 685 static jlong current_thread_cpu_time();
684 686 static jlong thread_cpu_time(Thread* t);
685 687
686 688 // Thread CPU Time with user_sys_cpu_time parameter.
687 689 //
688 690 // If user_sys_cpu_time is true, user+sys time is returned.
689 691 // Otherwise, only user time is returned
690 692 static jlong current_thread_cpu_time(bool user_sys_cpu_time);
691 693 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time);
692 694
693 695 // Return a bunch of info about the timers.
694 696 // Note that the returned info for these two functions may be different
695 697 // on some platforms
696 698 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
697 699 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
698 700
699 701 static bool is_thread_cpu_time_supported();
700 702
701 703 // System loadavg support. Returns -1 if load average cannot be obtained.
702 704 static int loadavg(double loadavg[], int nelem);
703 705
704 706 // Hook for os specific jvm options that we don't want to abort on seeing
705 707 static bool obsolete_option(const JavaVMOption *option);
706 708
707 709 // Read file line by line. If line is longer than bsize,
708 710 // rest of line is skipped. Returns number of bytes read or -1 on EOF
709 711 static int get_line_chars(int fd, char *buf, const size_t bsize);
710 712
711 713 // Extensions
712 714 #include "runtime/os_ext.hpp"
713 715
714 716 public:
715 717
716 718 // Platform dependent stuff
717 719 #ifdef TARGET_OS_FAMILY_linux
718 720 # include "os_linux.hpp"
719 721 # include "os_posix.hpp"
720 722 #endif
721 723 #ifdef TARGET_OS_FAMILY_solaris
722 724 # include "os_solaris.hpp"
723 725 # include "os_posix.hpp"
724 726 #endif
725 727 #ifdef TARGET_OS_FAMILY_windows
726 728 # include "os_windows.hpp"
727 729 #endif
728 730 #ifdef TARGET_OS_FAMILY_bsd
729 731 # include "os_posix.hpp"
730 732 # include "os_bsd.hpp"
731 733 #endif
732 734 #ifdef TARGET_OS_ARCH_linux_x86
733 735 # include "os_linux_x86.hpp"
734 736 #endif
735 737 #ifdef TARGET_OS_ARCH_linux_sparc
736 738 # include "os_linux_sparc.hpp"
737 739 #endif
738 740 #ifdef TARGET_OS_ARCH_linux_zero
739 741 # include "os_linux_zero.hpp"
740 742 #endif
741 743 #ifdef TARGET_OS_ARCH_solaris_x86
742 744 # include "os_solaris_x86.hpp"
743 745 #endif
744 746 #ifdef TARGET_OS_ARCH_solaris_sparc
745 747 # include "os_solaris_sparc.hpp"
746 748 #endif
747 749 #ifdef TARGET_OS_ARCH_windows_x86
748 750 # include "os_windows_x86.hpp"
749 751 #endif
750 752 #ifdef TARGET_OS_ARCH_linux_arm
751 753 # include "os_linux_arm.hpp"
752 754 #endif
753 755 #ifdef TARGET_OS_ARCH_linux_ppc
754 756 # include "os_linux_ppc.hpp"
755 757 #endif
756 758 #ifdef TARGET_OS_ARCH_bsd_x86
757 759 # include "os_bsd_x86.hpp"
758 760 #endif
759 761 #ifdef TARGET_OS_ARCH_bsd_zero
760 762 # include "os_bsd_zero.hpp"
761 763 #endif
762 764
763 765 public:
764 766 // debugging support (mostly used by debug.cpp but also fatal error handler)
765 767 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address
766 768
767 769 static bool dont_yield(); // when true, JVM_Yield() is nop
768 770 static void print_statistics();
769 771
770 772 // Thread priority helpers (implemented in OS-specific part)
771 773 static OSReturn set_native_priority(Thread* thread, int native_prio);
772 774 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr);
773 775 static int java_to_os_priority[CriticalPriority + 1];
774 776 // Hint to the underlying OS that a task switch would not be good.
775 777 // Void return because it's a hint and can fail.
776 778 static void hint_no_preempt();
777 779
778 780 // Used at creation if requested by the diagnostic flag PauseAtStartup.
779 781 // Causes the VM to wait until an external stimulus has been applied
780 782 // (for Unix, that stimulus is a signal, for Windows, an external
781 783 // ResumeThread call)
782 784 static void pause();
783 785
784 786 class SuspendedThreadTaskContext {
785 787 public:
786 788 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {}
787 789 Thread* thread() const { return _thread; }
788 790 void* ucontext() const { return _ucontext; }
789 791 private:
790 792 Thread* _thread;
791 793 void* _ucontext;
792 794 };
793 795
794 796 class SuspendedThreadTask {
795 797 public:
796 798 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {}
797 799 virtual ~SuspendedThreadTask() {}
798 800 void run();
799 801 bool is_done() { return _done; }
800 802 virtual void do_task(const SuspendedThreadTaskContext& context) = 0;
801 803 protected:
802 804 private:
803 805 void internal_do_task();
804 806 Thread* _thread;
805 807 bool _done;
806 808 };
807 809
808 810 #ifndef TARGET_OS_FAMILY_windows
809 811 // Suspend/resume support
810 812 // Protocol:
811 813 //
812 814 // a thread starts in SR_RUNNING
813 815 //
814 816 // SR_RUNNING can go to
815 817 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it
816 818 // SR_SUSPEND_REQUEST can go to
817 819 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout)
818 820 // * SR_SUSPENDED if the stopped thread receives the signal and switches state
819 821 // SR_SUSPENDED can go to
820 822 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume
821 823 // SR_WAKEUP_REQUEST can go to
822 824 // * SR_RUNNING when the stopped thread receives the signal
823 825 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again)
824 826 class SuspendResume {
825 827 public:
826 828 enum State {
827 829 SR_RUNNING,
828 830 SR_SUSPEND_REQUEST,
829 831 SR_SUSPENDED,
830 832 SR_WAKEUP_REQUEST
831 833 };
832 834
833 835 private:
834 836 volatile State _state;
835 837
836 838 private:
837 839 /* try to switch state from state "from" to state "to"
838 840 * returns the state set after the method is complete
839 841 */
840 842 State switch_state(State from, State to) {
841 843 State result = (State) Atomic::cmpxchg((jint) to, (jint *) &_state, (jint) from);
842 844 if (result == from) {
843 845 // success
844 846 return to;
845 847 }
846 848 return result;
847 849 }
848 850
849 851 public:
850 852 SuspendResume() : _state(SR_RUNNING) { }
851 853
852 854 State state() const { return _state; }
853 855
854 856 State request_suspend() {
855 857 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST);
856 858 }
857 859
858 860 State cancel_suspend() {
859 861 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING);
860 862 }
861 863
862 864 State suspended() {
863 865 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED);
864 866 }
865 867
866 868 State request_wakeup() {
867 869 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST);
868 870 }
869 871
870 872 State running() {
871 873 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING);
872 874 }
873 875
874 876 bool is_running() const {
875 877 return _state == SR_RUNNING;
876 878 }
877 879
878 880 bool is_suspend_request() const {
879 881 return _state == SR_SUSPEND_REQUEST;
880 882 }
881 883
882 884 bool is_suspended() const {
883 885 return _state == SR_SUSPENDED;
884 886 }
885 887 };
886 888 #endif
887 889
888 890
889 891 protected:
890 892 static long _rand_seed; // seed for random number generator
891 893 static int _processor_count; // number of processors
892 894
893 895 static char* format_boot_path(const char* format_string,
894 896 const char* home,
895 897 int home_len,
896 898 char fileSep,
897 899 char pathSep);
898 900 static bool set_boot_path(char fileSep, char pathSep);
899 901 static char** split_path(const char* path, int* n);
900 902 };
901 903
902 904 // Note that "PAUSE" is almost always used with synchronization
903 905 // so arguably we should provide Atomic::SpinPause() instead
904 906 // of the global SpinPause() with C linkage.
905 907 // It'd also be eligible for inlining on many platforms.
906 908
907 909 extern "C" int SpinPause () ;
908 910 extern "C" int SafeFetch32 (int * adr, int errValue) ;
909 911 extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t errValue) ;
910 912
911 913 #endif // SHARE_VM_RUNTIME_OS_HPP
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