Mercurial > hg > truffle
annotate src/share/vm/runtime/os.hpp @ 477:24fda36852ce
6727377: VM stack guard pages on Windows should PAGE_READWRITE not PAGE_EXECUTE_READWRITE
Summary: Make reguard_stack change access to RW, not execute and use os::protect_memory with the new parameter when change needed to X.
Reviewed-by: acorn, jcoomes
| author | coleenp |
|---|---|
| date | Wed, 10 Dec 2008 15:14:29 -0800 |
| parents | 1ee8caae33af |
| children | 773234c55e8c |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved. |
| 0 | 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 */ | |
| 24 | |
| 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. | |
| 28 | |
| 29 typedef void (*dll_func)(...); | |
| 30 | |
| 31 class Thread; | |
| 32 class JavaThread; | |
| 33 class Event; | |
| 34 class DLL; | |
| 35 class FileHandle; | |
| 141 | 36 template<class E> class GrowableArray; |
| 0 | 37 |
| 38 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose | |
| 39 | |
| 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 }; | |
| 49 | |
| 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 }; | |
| 58 | |
| 59 // Typedef for structured exception handling support | |
| 60 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); | |
| 61 | |
| 62 class os: AllStatic { | |
| 63 private: | |
| 64 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) | |
| 65 | |
| 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]; | |
| 71 | |
| 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 } | |
| 76 | |
| 77 public: | |
| 78 | |
| 79 static void init(void); // Called before command line parsing | |
| 80 static jint init_2(void); // Called after command line parsing | |
| 81 | |
| 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); | |
| 85 | |
| 86 static bool getenv(const char* name, char* buffer, int len); | |
| 87 static bool have_special_privileges(); | |
| 88 | |
| 89 static jlong javaTimeMillis(); | |
| 90 static jlong javaTimeNanos(); | |
| 91 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); | |
| 92 static void run_periodic_checks(); | |
| 93 | |
| 94 | |
| 95 // Returns the elapsed time in seconds since the vm started. | |
| 96 static double elapsedTime(); | |
| 97 | |
| 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); | |
| 103 | |
| 104 // Interface to the performance counter | |
| 105 static jlong elapsed_counter(); | |
| 106 static jlong elapsed_frequency(); | |
| 107 | |
|
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108 // The "virtual time" of a thread is the amount of time a thread has |
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109 // actually run. The first function indicates whether the OS supports |
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110 // this functionality for the current thread, and if so: |
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111 // * the second enables vtime tracking (if that is required). |
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112 // * the third tells whether vtime is enabled. |
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113 // * the fourth returns the elapsed virtual time for the current |
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114 // thread. |
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115 static bool supports_vtime(); |
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116 static bool enable_vtime(); |
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117 static bool vtime_enabled(); |
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118 static double elapsedVTime(); |
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119 |
| 0 | 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); | |
| 128 | |
| 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(); | |
| 138 | |
| 139 // number of CPUs | |
| 140 static int processor_count() { | |
| 141 return _processor_count; | |
| 142 } | |
| 143 | |
| 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(); | |
| 147 | |
| 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); | |
| 159 | |
| 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); | |
| 167 | |
| 168 // OS interface to Virtual Memory | |
| 169 | |
| 170 // Return the default page size. | |
| 171 static int vm_page_size(); | |
| 172 | |
| 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); | |
| 186 | |
| 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; | |
| 197 | |
| 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); | |
|
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208 |
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209 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; |
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210 static bool protect_memory(char* addr, size_t bytes, ProtType prot, |
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211 bool is_committed = true); |
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212 |
| 0 | 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); | |
| 224 | |
| 225 // NUMA-specific interface | |
| 141 | 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); | |
| 0 | 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(); | |
| 234 | |
| 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); | |
| 242 | |
| 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(); | |
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250 static bool can_execute_large_page_memory(); |
| 0 | 251 |
| 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(); | |
| 258 | |
| 259 // Routines used to serialize the thread state without using membars | |
| 260 static void serialize_thread_states(); | |
| 261 | |
| 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 } | |
| 270 | |
| 271 static void set_serialize_page_mask(uintptr_t mask) { | |
| 272 _serialize_page_mask = mask; | |
| 273 } | |
| 274 | |
| 275 static unsigned int get_serialize_page_mask() { | |
| 276 return _serialize_page_mask; | |
| 277 } | |
| 278 | |
| 279 static void set_memory_serialize_page(address page); | |
| 280 | |
| 281 static address get_memory_serialize_page() { | |
| 282 return (address)_mem_serialize_page; | |
| 283 } | |
| 284 | |
| 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 } | |
| 291 | |
| 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 } | |
| 307 | |
| 308 static void block_on_serialize_page_trap(); | |
| 309 | |
| 310 // threads | |
| 311 | |
| 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 }; | |
| 320 | |
| 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); | |
| 328 | |
| 329 static void initialize_thread(); | |
| 330 static void free_thread(OSThread* osthread); | |
| 331 | |
| 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); | |
| 355 | |
| 356 static void interrupt(Thread* thread); | |
| 357 static bool is_interrupted(Thread* thread, bool clear_interrupted); | |
| 358 | |
| 359 static int pd_self_suspend_thread(Thread* thread); | |
| 360 | |
| 361 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); | |
| 362 static frame fetch_frame_from_context(void* ucVoid); | |
| 363 | |
| 364 static ExtendedPC get_thread_pc(Thread *thread); | |
| 365 static void breakpoint(); | |
| 366 | |
| 367 static address current_stack_pointer(); | |
| 368 static address current_stack_base(); | |
| 369 static size_t current_stack_size(); | |
| 370 | |
| 371 static int message_box(const char* title, const char* message); | |
| 372 static char* do_you_want_to_debug(const char* message); | |
| 373 | |
| 374 // run cmd in a separate process and return its exit code; or -1 on failures | |
| 375 static int fork_and_exec(char *cmd); | |
| 376 | |
| 377 // Set file to send error reports. | |
| 378 static void set_error_file(const char *logfile); | |
| 379 | |
| 380 // os::exit() is merged with vm_exit() | |
| 381 // static void exit(int num); | |
| 382 | |
| 383 // Terminate the VM, but don't exit the process | |
| 384 static void shutdown(); | |
| 385 | |
| 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); | |
| 389 | |
| 390 // Die immediately, no exit hook, no abort hook, no cleanup. | |
| 391 static void die(); | |
| 392 | |
| 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); | |
| 398 | |
| 399 // Dynamic library extension | |
| 400 static const char* dll_file_extension(); | |
| 401 | |
| 402 static const char* get_temp_directory(); | |
| 403 static const char* get_current_directory(char *buf, int buflen); | |
| 404 | |
| 242 | 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); | |
| 408 | |
| 0 | 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); | |
| 416 | |
| 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); | |
| 423 | |
| 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); | |
| 426 | |
| 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); | |
| 431 | |
| 242 | 432 // lookup symbol in a shared library |
| 433 static void* dll_lookup(void* handle, const char* name); | |
| 434 | |
| 0 | 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); | |
| 446 | |
| 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); | |
| 460 | |
| 461 // return current frame. pc() and sp() are set to NULL on failure. | |
| 462 static frame current_frame(); | |
| 463 | |
| 464 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); | |
| 465 | |
| 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); | |
| 469 | |
| 470 // Returns native Java library, loads if necessary | |
| 471 static void* native_java_library(); | |
| 472 | |
| 473 // Fills in path to jvm.dll/libjvm.so (this info used to find hpi). | |
| 474 static void jvm_path(char *buf, jint buflen); | |
| 475 | |
| 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); | |
| 479 | |
| 480 // File conventions | |
| 481 static const char* file_separator(); | |
| 482 static const char* line_separator(); | |
| 483 static const char* path_separator(); | |
| 484 | |
| 485 // Init os specific system properties values | |
| 486 static void init_system_properties_values(); | |
| 487 | |
| 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); | |
| 491 | |
| 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); | |
| 496 | |
| 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); | |
| 502 | |
| 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 | |
| 509 | |
| 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 | |
| 515 | |
| 516 // Printing 64 bit integers | |
| 517 static const char* jlong_format_specifier(); | |
| 518 static const char* julong_format_specifier(); | |
| 519 | |
| 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(); | |
| 531 | |
| 532 // random number generation | |
| 533 static long random(); // return 32bit pseudorandom number | |
| 534 static void init_random(long initval); // initialize random sequence | |
| 535 | |
| 536 // Structured OS Exception support | |
| 537 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); | |
| 538 | |
| 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. | |
| 543 | |
| 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); | |
| 551 | |
| 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); | |
| 558 | |
| 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); | |
| 564 | |
| 565 static bool is_thread_cpu_time_supported(); | |
| 566 | |
| 567 // System loadavg support. Returns -1 if load average cannot be obtained. | |
| 568 static int loadavg(double loadavg[], int nelem); | |
| 569 | |
| 570 // Hook for os specific jvm options that we don't want to abort on seeing | |
| 571 static bool obsolete_option(const JavaVMOption *option); | |
| 572 | |
| 573 // Platform dependent stuff | |
| 574 #include "incls/_os_pd.hpp.incl" | |
| 575 | |
| 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 | |
| 578 | |
| 579 static bool dont_yield(); // when true, JVM_Yield() is nop | |
| 580 static void print_statistics(); | |
| 581 | |
| 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(); | |
| 589 | |
| 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(); | |
| 595 | |
| 596 protected: | |
| 597 static long _rand_seed; // seed for random number generator | |
| 598 static int _processor_count; // number of processors | |
| 599 | |
| 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 }; | |
| 607 | |
| 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. | |
| 612 | |
| 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) ; |