1 /* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_OS_HPP 26 #define SHARE_VM_RUNTIME_OS_HPP 27 28 #include "jvmtifiles/jvmti.h" 29 #include "runtime/atomic.hpp" 30 #include "runtime/extendedPC.hpp" 31 #include "runtime/handles.hpp" 32 #include "utilities/top.hpp" 33 #ifdef TARGET_OS_FAMILY_linux 34 # include "jvm_linux.h" 35 # include <setjmp.h> 36 #endif 37 #ifdef TARGET_OS_FAMILY_solaris 38 # include "jvm_solaris.h" 39 # include <setjmp.h> 40 #endif 41 #ifdef TARGET_OS_FAMILY_windows 42 # include "jvm_windows.h" 43 #endif 44 #ifdef TARGET_OS_FAMILY_aix 45 # include "jvm_aix.h" 46 # include <setjmp.h> 47 #endif 48 #ifdef TARGET_OS_FAMILY_bsd 49 # include "jvm_bsd.h" 50 # include <setjmp.h> 51 # ifdef __APPLE__ 52 # include <mach/mach_time.h> 53 # endif 54 #endif 55 56 class AgentLibrary; 57 58 // os defines the interface to operating system; this includes traditional 59 // OS services (time, I/O) as well as other functionality with system- 60 // dependent code. 61 62 typedef void (*dll_func)(...); 63 64 class Thread; 65 class JavaThread; 66 class Event; 67 class DLL; 68 class FileHandle; 69 class NativeCallStack; 70 71 template<class E> class GrowableArray; 72 73 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose 74 75 // Platform-independent error return values from OS functions 76 enum OSReturn { 77 OS_OK = 0, // Operation was successful 78 OS_ERR = -1, // Operation failed 79 OS_INTRPT = -2, // Operation was interrupted 80 OS_TIMEOUT = -3, // Operation timed out 81 OS_NOMEM = -5, // Operation failed for lack of memory 82 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource 83 }; 84 85 enum ThreadPriority { // JLS 20.20.1-3 86 NoPriority = -1, // Initial non-priority value 87 MinPriority = 1, // Minimum priority 88 NormPriority = 5, // Normal (non-daemon) priority 89 NearMaxPriority = 9, // High priority, used for VMThread 90 MaxPriority = 10, // Highest priority, used for WatcherThread 91 // ensures that VMThread doesn't starve profiler 92 CriticalPriority = 11 // Critical thread priority 93 }; 94 95 // Executable parameter flag for os::commit_memory() and 96 // os::commit_memory_or_exit(). 97 const bool ExecMem = true; 98 99 // Typedef for structured exception handling support 100 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); 101 102 class MallocTracker; 103 104 class os: AllStatic { 105 friend class VMStructs; 106 friend class MallocTracker; 107 public: 108 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) 109 110 private: 111 static OSThread* _starting_thread; 112 static address _polling_page; 113 static volatile int32_t * _mem_serialize_page; 114 static uintptr_t _serialize_page_mask; 115 public: 116 static size_t _page_sizes[page_sizes_max]; 117 118 private: 119 static void init_page_sizes(size_t default_page_size) { 120 _page_sizes[0] = default_page_size; 121 _page_sizes[1] = 0; // sentinel 122 } 123 124 static char* pd_reserve_memory(size_t bytes, char* addr = 0, 125 size_t alignment_hint = 0); 126 static char* pd_attempt_reserve_memory_at(size_t bytes, char* addr); 127 static void pd_split_reserved_memory(char *base, size_t size, 128 size_t split, bool realloc); 129 static bool pd_commit_memory(char* addr, size_t bytes, bool executable); 130 static bool pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 131 bool executable); 132 // Same as pd_commit_memory() that either succeeds or calls 133 // vm_exit_out_of_memory() with the specified mesg. 134 static void pd_commit_memory_or_exit(char* addr, size_t bytes, 135 bool executable, const char* mesg); 136 static void pd_commit_memory_or_exit(char* addr, size_t size, 137 size_t alignment_hint, 138 bool executable, const char* mesg); 139 static bool pd_uncommit_memory(char* addr, size_t bytes); 140 static bool pd_release_memory(char* addr, size_t bytes); 141 142 static char* pd_map_memory(int fd, const char* file_name, size_t file_offset, 143 char *addr, size_t bytes, bool read_only = false, 144 bool allow_exec = false); 145 static char* pd_remap_memory(int fd, const char* file_name, size_t file_offset, 146 char *addr, size_t bytes, bool read_only, 147 bool allow_exec); 148 static bool pd_unmap_memory(char *addr, size_t bytes); 149 static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint); 150 static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint); 151 152 static size_t page_size_for_region(size_t region_size, size_t min_pages, bool must_be_aligned); 153 154 static void initialize_initial_active_processor_count(); 155 public: 156 static void init(void); // Called before command line parsing 157 static void init_before_ergo(void); // Called after command line parsing 158 // before VM ergonomics processing. 159 static jint init_2(void); // Called after command line parsing 160 // and VM ergonomics processing 161 static void init_globals(void) { // Called from init_globals() in init.cpp 162 init_globals_ext(); 163 } 164 165 // File names are case-insensitive on windows only 166 // Override me as needed 167 static int file_name_strcmp(const char* s1, const char* s2); 168 169 // get/unset environment variable 170 static bool getenv(const char* name, char* buffer, int len); 171 static bool unsetenv(const char* name); 172 173 static bool have_special_privileges(); 174 175 static jlong javaTimeMillis(); 176 static jlong javaTimeNanos(); 177 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); 178 static void run_periodic_checks(); 179 180 181 // Returns the elapsed time in seconds since the vm started. 182 static double elapsedTime(); 183 184 // Returns real time in seconds since an arbitrary point 185 // in the past. 186 static bool getTimesSecs(double* process_real_time, 187 double* process_user_time, 188 double* process_system_time); 189 190 // Interface to the performance counter 191 static jlong elapsed_counter(); 192 static jlong elapsed_frequency(); 193 194 // The "virtual time" of a thread is the amount of time a thread has 195 // actually run. The first function indicates whether the OS supports 196 // this functionality for the current thread, and if so: 197 // * the second enables vtime tracking (if that is required). 198 // * the third tells whether vtime is enabled. 199 // * the fourth returns the elapsed virtual time for the current 200 // thread. 201 static bool supports_vtime(); 202 static bool enable_vtime(); 203 static bool vtime_enabled(); 204 static double elapsedVTime(); 205 206 // Return current local time in a string (YYYY-MM-DD HH:MM:SS). 207 // It is MT safe, but not async-safe, as reading time zone 208 // information may require a lock on some platforms. 209 static char* local_time_string(char *buf, size_t buflen); 210 static struct tm* localtime_pd (const time_t* clock, struct tm* res); 211 // Fill in buffer with current local time as an ISO-8601 string. 212 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. 213 // Returns buffer, or NULL if it failed. 214 static char* iso8601_time(char* buffer, size_t buffer_length); 215 216 // Interface for detecting multiprocessor system 217 static inline bool is_MP() { 218 // During bootstrap if _processor_count is not yet initialized 219 // we claim to be MP as that is safest. If any platform has a 220 // stub generator that might be triggered in this phase and for 221 // which being declared MP when in fact not, is a problem - then 222 // the bootstrap routine for the stub generator needs to check 223 // the processor count directly and leave the bootstrap routine 224 // in place until called after initialization has ocurred. 225 return (_processor_count != 1) || AssumeMP; 226 } 227 static julong available_memory(); 228 static julong physical_memory(); 229 static bool has_allocatable_memory_limit(julong* limit); 230 static bool is_server_class_machine(); 231 232 // number of CPUs 233 static int processor_count() { 234 return _processor_count; 235 } 236 static void set_processor_count(int count) { _processor_count = count; } 237 238 // Returns the number of CPUs this process is currently allowed to run on. 239 // Note that on some OSes this can change dynamically. 240 static int active_processor_count(); 241 242 // At startup the number of active CPUs this process is allowed to run on. 243 // This value does not change dynamically. May be different from active_processor_count(). 244 static int initial_active_processor_count() { 245 assert(_initial_active_processor_count > 0, "Initial active processor count not set yet."); 246 return _initial_active_processor_count; 247 } 248 249 // Bind processes to processors. 250 // This is a two step procedure: 251 // first you generate a distribution of processes to processors, 252 // then you bind processes according to that distribution. 253 // Compute a distribution for number of processes to processors. 254 // Stores the processor id's into the distribution array argument. 255 // Returns true if it worked, false if it didn't. 256 static bool distribute_processes(uint length, uint* distribution); 257 // Binds the current process to a processor. 258 // Returns true if it worked, false if it didn't. 259 static bool bind_to_processor(uint processor_id); 260 261 // Give a name to the current thread. 262 static void set_native_thread_name(const char *name); 263 264 // Interface for stack banging (predetect possible stack overflow for 265 // exception processing) There are guard pages, and above that shadow 266 // pages for stack overflow checking. 267 static bool uses_stack_guard_pages(); 268 static bool allocate_stack_guard_pages(); 269 static void bang_stack_shadow_pages(); 270 static bool stack_shadow_pages_available(Thread *thread, methodHandle method); 271 272 // OS interface to Virtual Memory 273 274 // Return the default page size. 275 static int vm_page_size(); 276 277 // Returns the page size to use for a region of memory. 278 // region_size / min_pages will always be greater than or equal to the 279 // returned value. The returned value will divide region_size. 280 static size_t page_size_for_region_aligned(size_t region_size, size_t min_pages); 281 282 // Returns the page size to use for a region of memory. 283 // region_size / min_pages will always be greater than or equal to the 284 // returned value. The returned value might not divide region_size. 285 static size_t page_size_for_region_unaligned(size_t region_size, size_t min_pages); 286 287 // Return the largest page size that can be used 288 static size_t max_page_size() { 289 // The _page_sizes array is sorted in descending order. 290 return _page_sizes[0]; 291 } 292 293 // Methods for tracing page sizes returned by the above method; enabled by 294 // TracePageSizes. The region_{min,max}_size parameters should be the values 295 // passed to page_size_for_region() and page_size should be the result of that 296 // call. The (optional) base and size parameters should come from the 297 // ReservedSpace base() and size() methods. 298 static void trace_page_sizes(const char* str, const size_t* page_sizes, 299 int count) PRODUCT_RETURN; 300 static void trace_page_sizes(const char* str, const size_t region_min_size, 301 const size_t region_max_size, 302 const size_t page_size, 303 const char* base = NULL, 304 const size_t size = 0) PRODUCT_RETURN; 305 306 static int vm_allocation_granularity(); 307 static char* reserve_memory(size_t bytes, char* addr = 0, 308 size_t alignment_hint = 0); 309 static char* reserve_memory(size_t bytes, char* addr, 310 size_t alignment_hint, MEMFLAGS flags); 311 static char* reserve_memory_aligned(size_t size, size_t alignment); 312 static char* attempt_reserve_memory_at(size_t bytes, char* addr); 313 static void split_reserved_memory(char *base, size_t size, 314 size_t split, bool realloc); 315 static bool commit_memory(char* addr, size_t bytes, bool executable); 316 static bool commit_memory(char* addr, size_t size, size_t alignment_hint, 317 bool executable); 318 // Same as commit_memory() that either succeeds or calls 319 // vm_exit_out_of_memory() with the specified mesg. 320 static void commit_memory_or_exit(char* addr, size_t bytes, 321 bool executable, const char* mesg); 322 static void commit_memory_or_exit(char* addr, size_t size, 323 size_t alignment_hint, 324 bool executable, const char* mesg); 325 static bool uncommit_memory(char* addr, size_t bytes); 326 static bool release_memory(char* addr, size_t bytes); 327 328 // Touch memory pages that cover the memory range from start to end (exclusive) 329 // to make the OS back the memory range with actual memory. 330 // Current implementation may not touch the last page if unaligned addresses 331 // are passed. 332 static void pretouch_memory(char* start, char* end); 333 334 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; 335 static bool protect_memory(char* addr, size_t bytes, ProtType prot, 336 bool is_committed = true); 337 338 static bool guard_memory(char* addr, size_t bytes); 339 static bool unguard_memory(char* addr, size_t bytes); 340 static bool create_stack_guard_pages(char* addr, size_t bytes); 341 static bool pd_create_stack_guard_pages(char* addr, size_t bytes); 342 static bool remove_stack_guard_pages(char* addr, size_t bytes); 343 344 static char* map_memory(int fd, const char* file_name, size_t file_offset, 345 char *addr, size_t bytes, bool read_only = false, 346 bool allow_exec = false); 347 static char* remap_memory(int fd, const char* file_name, size_t file_offset, 348 char *addr, size_t bytes, bool read_only, 349 bool allow_exec); 350 static bool unmap_memory(char *addr, size_t bytes); 351 static void free_memory(char *addr, size_t bytes, size_t alignment_hint); 352 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); 353 354 // NUMA-specific interface 355 static bool numa_has_static_binding(); 356 static bool numa_has_group_homing(); 357 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); 358 static void numa_make_global(char *addr, size_t bytes); 359 static size_t numa_get_groups_num(); 360 static size_t numa_get_leaf_groups(int *ids, size_t size); 361 static bool numa_topology_changed(); 362 static int numa_get_group_id(); 363 364 // Page manipulation 365 struct page_info { 366 size_t size; 367 int lgrp_id; 368 }; 369 static bool get_page_info(char *start, page_info* info); 370 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); 371 372 static char* non_memory_address_word(); 373 // reserve, commit and pin the entire memory region 374 static char* reserve_memory_special(size_t size, size_t alignment, 375 char* addr, bool executable); 376 static bool release_memory_special(char* addr, size_t bytes); 377 static void large_page_init(); 378 static size_t large_page_size(); 379 static bool can_commit_large_page_memory(); 380 static bool can_execute_large_page_memory(); 381 382 // OS interface to polling page 383 static address get_polling_page() { return _polling_page; } 384 static void set_polling_page(address page) { _polling_page = page; } 385 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } 386 static void make_polling_page_unreadable(); 387 static void make_polling_page_readable(); 388 389 // Routines used to serialize the thread state without using membars 390 static void serialize_thread_states(); 391 392 // Since we write to the serialize page from every thread, we 393 // want stores to be on unique cache lines whenever possible 394 // in order to minimize CPU cross talk. We pre-compute the 395 // amount to shift the thread* to make this offset unique to 396 // each thread. 397 static int get_serialize_page_shift_count() { 398 return SerializePageShiftCount; 399 } 400 401 static void set_serialize_page_mask(uintptr_t mask) { 402 _serialize_page_mask = mask; 403 } 404 405 static unsigned int get_serialize_page_mask() { 406 return _serialize_page_mask; 407 } 408 409 static void set_memory_serialize_page(address page); 410 411 static address get_memory_serialize_page() { 412 return (address)_mem_serialize_page; 413 } 414 415 static inline void write_memory_serialize_page(JavaThread *thread) { 416 uintptr_t page_offset = ((uintptr_t)thread >> 417 get_serialize_page_shift_count()) & 418 get_serialize_page_mask(); 419 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; 420 } 421 422 static bool is_memory_serialize_page(JavaThread *thread, address addr) { 423 if (UseMembar) return false; 424 // Previously this function calculated the exact address of this 425 // thread's serialize page, and checked if the faulting address 426 // was equal. However, some platforms mask off faulting addresses 427 // to the page size, so now we just check that the address is 428 // within the page. This makes the thread argument unnecessary, 429 // but we retain the NULL check to preserve existing behaviour. 430 if (thread == NULL) return false; 431 address page = (address) _mem_serialize_page; 432 return addr >= page && addr < (page + os::vm_page_size()); 433 } 434 435 static void block_on_serialize_page_trap(); 436 437 // threads 438 439 enum ThreadType { 440 vm_thread, 441 cgc_thread, // Concurrent GC thread 442 pgc_thread, // Parallel GC thread 443 java_thread, 444 compiler_thread, 445 watcher_thread, 446 os_thread 447 }; 448 449 static bool create_thread(Thread* thread, 450 ThreadType thr_type, 451 size_t stack_size = 0); 452 static bool create_main_thread(JavaThread* thread); 453 static bool create_attached_thread(JavaThread* thread); 454 static void pd_start_thread(Thread* thread); 455 static void start_thread(Thread* thread); 456 457 static void initialize_thread(Thread* thr); 458 static void free_thread(OSThread* osthread); 459 460 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit 461 static intx current_thread_id(); 462 static int current_process_id(); 463 static int sleep(Thread* thread, jlong ms, bool interruptable); 464 // Short standalone OS sleep suitable for slow path spin loop. 465 // Ignores Thread.interrupt() (so keep it short). 466 // ms = 0, will sleep for the least amount of time allowed by the OS. 467 static void naked_short_sleep(jlong ms); 468 static void infinite_sleep(); // never returns, use with CAUTION 469 static void yield(); // Yields to all threads with same priority 470 enum YieldResult { 471 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran 472 YIELD_NONEREADY = 0, // No other runnable/ready threads. 473 // platform-specific yield return immediately 474 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY 475 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong" 476 // yield that can be used in lieu of blocking. 477 } ; 478 static YieldResult NakedYield () ; 479 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority 480 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing 481 static OSReturn set_priority(Thread* thread, ThreadPriority priority); 482 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); 483 484 static void interrupt(Thread* thread); 485 static bool is_interrupted(Thread* thread, bool clear_interrupted); 486 487 static int pd_self_suspend_thread(Thread* thread); 488 489 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); 490 static frame fetch_frame_from_context(void* ucVoid); 491 492 static ExtendedPC get_thread_pc(Thread *thread); 493 static void breakpoint(); 494 495 static address current_stack_pointer(); 496 static address current_stack_base(); 497 static size_t current_stack_size(); 498 499 static void verify_stack_alignment() PRODUCT_RETURN; 500 501 static int message_box(const char* title, const char* message); 502 static char* do_you_want_to_debug(const char* message); 503 504 // run cmd in a separate process and return its exit code; or -1 on failures 505 static int fork_and_exec(char *cmd); 506 507 // os::exit() is merged with vm_exit() 508 // static void exit(int num); 509 510 // Terminate the VM, but don't exit the process 511 static void shutdown(); 512 513 // Terminate with an error. Default is to generate a core file on platforms 514 // that support such things. This calls shutdown() and then aborts. 515 static void abort(bool dump_core = true); 516 517 // Die immediately, no exit hook, no abort hook, no cleanup. 518 static void die(); 519 520 // File i/o operations 521 static const int default_file_open_flags(); 522 static int open(const char *path, int oflag, int mode); 523 static FILE* open(int fd, const char* mode); 524 static int close(int fd); 525 static jlong lseek(int fd, jlong offset, int whence); 526 static char* native_path(char *path); 527 static int ftruncate(int fd, jlong length); 528 static int fsync(int fd); 529 static int available(int fd, jlong *bytes); 530 531 //File i/o operations 532 533 static size_t read(int fd, void *buf, unsigned int nBytes); 534 static size_t restartable_read(int fd, void *buf, unsigned int nBytes); 535 static size_t write(int fd, const void *buf, unsigned int nBytes); 536 537 // Reading directories. 538 static DIR* opendir(const char* dirname); 539 static int readdir_buf_size(const char *path); 540 static struct dirent* readdir(DIR* dirp, dirent* dbuf); 541 static int closedir(DIR* dirp); 542 543 // Dynamic library extension 544 static const char* dll_file_extension(); 545 546 static const char* get_temp_directory(); 547 static const char* get_current_directory(char *buf, size_t buflen); 548 549 // Builds a platform-specific full library path given a ld path and lib name 550 // Returns true if buffer contains full path to existing file, false otherwise 551 static bool dll_build_name(char* buffer, size_t size, 552 const char* pathname, const char* fname); 553 554 // Symbol lookup, find nearest function name; basically it implements 555 // dladdr() for all platforms. Name of the nearest function is copied 556 // to buf. Distance from its base address is optionally returned as offset. 557 // If function name is not found, buf[0] is set to '\0' and offset is 558 // set to -1 (if offset is non-NULL). 559 static bool dll_address_to_function_name(address addr, char* buf, 560 int buflen, int* offset); 561 562 // Locate DLL/DSO. On success, full path of the library is copied to 563 // buf, and offset is optionally set to be the distance between addr 564 // and the library's base address. On failure, buf[0] is set to '\0' 565 // and offset is set to -1 (if offset is non-NULL). 566 static bool dll_address_to_library_name(address addr, char* buf, 567 int buflen, int* offset); 568 569 // Find out whether the pc is in the static code for jvm.dll/libjvm.so. 570 static bool address_is_in_vm(address addr); 571 572 // Loads .dll/.so and 573 // in case of error it checks if .dll/.so was built for the 574 // same architecture as Hotspot is running on 575 static void* dll_load(const char *name, char *ebuf, int ebuflen); 576 577 // lookup symbol in a shared library 578 static void* dll_lookup(void* handle, const char* name); 579 580 // Unload library 581 static void dll_unload(void *lib); 582 583 // Return the handle of this process 584 static void* get_default_process_handle(); 585 586 // Check for static linked agent library 587 static bool find_builtin_agent(AgentLibrary *agent_lib, const char *syms[], 588 size_t syms_len); 589 590 // Find agent entry point 591 static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib, 592 const char *syms[], size_t syms_len); 593 594 // Print out system information; they are called by fatal error handler. 595 // Output format may be different on different platforms. 596 static void print_os_info(outputStream* st); 597 static void print_os_info_brief(outputStream* st); 598 static void print_cpu_info(outputStream* st); 599 static void pd_print_cpu_info(outputStream* st); 600 static void print_memory_info(outputStream* st); 601 static void print_dll_info(outputStream* st); 602 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len); 603 static void print_context(outputStream* st, void* context); 604 static void print_register_info(outputStream* st, void* context); 605 static void print_siginfo(outputStream* st, void* siginfo); 606 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); 607 static void print_date_and_time(outputStream* st); 608 609 static void print_location(outputStream* st, intptr_t x, bool verbose = false); 610 static size_t lasterror(char *buf, size_t len); 611 static int get_last_error(); 612 613 // Determines whether the calling process is being debugged by a user-mode debugger. 614 static bool is_debugger_attached(); 615 616 // wait for a key press if PauseAtExit is set 617 static void wait_for_keypress_at_exit(void); 618 619 // The following two functions are used by fatal error handler to trace 620 // native (C) frames. They are not part of frame.hpp/frame.cpp because 621 // frame.hpp/cpp assume thread is JavaThread, and also because different 622 // OS/compiler may have different convention or provide different API to 623 // walk C frames. 624 // 625 // We don't attempt to become a debugger, so we only follow frames if that 626 // does not require a lookup in the unwind table, which is part of the binary 627 // file but may be unsafe to read after a fatal error. So on x86, we can 628 // only walk stack if %ebp is used as frame pointer; on ia64, it's not 629 // possible to walk C stack without having the unwind table. 630 static bool is_first_C_frame(frame *fr); 631 static frame get_sender_for_C_frame(frame *fr); 632 633 // return current frame. pc() and sp() are set to NULL on failure. 634 static frame current_frame(); 635 636 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); 637 638 // returns a string to describe the exception/signal; 639 // returns NULL if exception_code is not an OS exception/signal. 640 static const char* exception_name(int exception_code, char* buf, size_t buflen); 641 642 // Returns native Java library, loads if necessary 643 static void* native_java_library(); 644 645 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler) 646 static void jvm_path(char *buf, jint buflen); 647 648 // Returns true if we are running in a headless jre. 649 static bool is_headless_jre(); 650 651 // JNI names 652 static void print_jni_name_prefix_on(outputStream* st, int args_size); 653 static void print_jni_name_suffix_on(outputStream* st, int args_size); 654 655 // File conventions 656 static const char* file_separator(); 657 static const char* line_separator(); 658 static const char* path_separator(); 659 660 // Init os specific system properties values 661 static void init_system_properties_values(); 662 663 // IO operations, non-JVM_ version. 664 static int stat(const char* path, struct stat* sbuf); 665 static bool dir_is_empty(const char* path); 666 667 // IO operations on binary files 668 static int create_binary_file(const char* path, bool rewrite_existing); 669 static jlong current_file_offset(int fd); 670 static jlong seek_to_file_offset(int fd, jlong offset); 671 672 // Thread Local Storage 673 static int allocate_thread_local_storage(); 674 static void thread_local_storage_at_put(int index, void* value); 675 static void* thread_local_storage_at(int index); 676 static void free_thread_local_storage(int index); 677 678 // Retrieve native stack frames. 679 // Parameter: 680 // stack: an array to storage stack pointers. 681 // frames: size of above array. 682 // toSkip: number of stack frames to skip at the beginning. 683 // Return: number of stack frames captured. 684 static int get_native_stack(address* stack, int size, int toSkip = 0); 685 686 // General allocation (must be MT-safe) 687 static void* malloc (size_t size, MEMFLAGS flags, const NativeCallStack& stack); 688 static void* malloc (size_t size, MEMFLAGS flags); 689 static void* realloc (void *memblock, size_t size, MEMFLAGS flag, const NativeCallStack& stack); 690 static void* realloc (void *memblock, size_t size, MEMFLAGS flag); 691 692 static void free (void *memblock, MEMFLAGS flags = mtNone); 693 static bool check_heap(bool force = false); // verify C heap integrity 694 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup 695 696 #ifndef PRODUCT 697 static julong num_mallocs; // # of calls to malloc/realloc 698 static julong alloc_bytes; // # of bytes allocated 699 static julong num_frees; // # of calls to free 700 static julong free_bytes; // # of bytes freed 701 #endif 702 703 // SocketInterface (ex HPI SocketInterface ) 704 static int socket(int domain, int type, int protocol); 705 static int socket_close(int fd); 706 static int socket_shutdown(int fd, int howto); 707 static int recv(int fd, char* buf, size_t nBytes, uint flags); 708 static int send(int fd, char* buf, size_t nBytes, uint flags); 709 static int raw_send(int fd, char* buf, size_t nBytes, uint flags); 710 static int timeout(int fd, long timeout); 711 static int listen(int fd, int count); 712 static int connect(int fd, struct sockaddr* him, socklen_t len); 713 static int bind(int fd, struct sockaddr* him, socklen_t len); 714 static int accept(int fd, struct sockaddr* him, socklen_t* len); 715 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags, 716 struct sockaddr* from, socklen_t* fromlen); 717 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len); 718 static int sendto(int fd, char* buf, size_t len, uint flags, 719 struct sockaddr* to, socklen_t tolen); 720 static int socket_available(int fd, jint* pbytes); 721 722 static int get_sock_opt(int fd, int level, int optname, 723 char* optval, socklen_t* optlen); 724 static int set_sock_opt(int fd, int level, int optname, 725 const char* optval, socklen_t optlen); 726 static int get_host_name(char* name, int namelen); 727 728 static struct hostent* get_host_by_name(char* name); 729 730 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) 731 static void signal_init(); 732 static void signal_init_pd(); 733 static void signal_notify(int signal_number); 734 static void* signal(int signal_number, void* handler); 735 static void signal_raise(int signal_number); 736 static int signal_wait(); 737 static int signal_lookup(); 738 static void* user_handler(); 739 static void terminate_signal_thread(); 740 static int sigexitnum_pd(); 741 742 // random number generation 743 static long random(); // return 32bit pseudorandom number 744 static void init_random(long initval); // initialize random sequence 745 746 // Structured OS Exception support 747 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); 748 749 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits 750 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize); 751 752 // Get the default path to the core file 753 // Returns the length of the string 754 static int get_core_path(char* buffer, size_t bufferSize); 755 756 // JVMTI & JVM monitoring and management support 757 // The thread_cpu_time() and current_thread_cpu_time() are only 758 // supported if is_thread_cpu_time_supported() returns true. 759 // They are not supported on Solaris T1. 760 761 // Thread CPU Time - return the fast estimate on a platform 762 // On Solaris - call gethrvtime (fast) - user time only 763 // On Linux - fast clock_gettime where available - user+sys 764 // - otherwise: very slow /proc fs - user+sys 765 // On Windows - GetThreadTimes - user+sys 766 static jlong current_thread_cpu_time(); 767 static jlong thread_cpu_time(Thread* t); 768 769 // Thread CPU Time with user_sys_cpu_time parameter. 770 // 771 // If user_sys_cpu_time is true, user+sys time is returned. 772 // Otherwise, only user time is returned 773 static jlong current_thread_cpu_time(bool user_sys_cpu_time); 774 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); 775 776 // Return a bunch of info about the timers. 777 // Note that the returned info for these two functions may be different 778 // on some platforms 779 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 780 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 781 782 static bool is_thread_cpu_time_supported(); 783 784 // System loadavg support. Returns -1 if load average cannot be obtained. 785 static int loadavg(double loadavg[], int nelem); 786 787 // Hook for os specific jvm options that we don't want to abort on seeing 788 static bool obsolete_option(const JavaVMOption *option); 789 790 // Extensions 791 #include "runtime/os_ext.hpp" 792 793 public: 794 class CrashProtectionCallback : public StackObj { 795 public: 796 virtual void call() = 0; 797 }; 798 799 // Platform dependent stuff 800 #ifdef TARGET_OS_FAMILY_linux 801 # include "os_linux.hpp" 802 # include "os_posix.hpp" 803 #endif 804 #ifdef TARGET_OS_FAMILY_solaris 805 # include "os_solaris.hpp" 806 # include "os_posix.hpp" 807 #endif 808 #ifdef TARGET_OS_FAMILY_windows 809 # include "os_windows.hpp" 810 #endif 811 #ifdef TARGET_OS_FAMILY_aix 812 # include "os_aix.hpp" 813 # include "os_posix.hpp" 814 #endif 815 #ifdef TARGET_OS_FAMILY_bsd 816 # include "os_posix.hpp" 817 # include "os_bsd.hpp" 818 #endif 819 #ifdef TARGET_OS_ARCH_linux_x86 820 # include "os_linux_x86.hpp" 821 #endif 822 #ifdef TARGET_OS_ARCH_linux_sparc 823 # include "os_linux_sparc.hpp" 824 #endif 825 #ifdef TARGET_OS_ARCH_linux_zero 826 # include "os_linux_zero.hpp" 827 #endif 828 #ifdef TARGET_OS_ARCH_solaris_x86 829 # include "os_solaris_x86.hpp" 830 #endif 831 #ifdef TARGET_OS_ARCH_solaris_sparc 832 # include "os_solaris_sparc.hpp" 833 #endif 834 #ifdef TARGET_OS_ARCH_windows_x86 835 # include "os_windows_x86.hpp" 836 #endif 837 #ifdef TARGET_OS_ARCH_linux_arm 838 # include "os_linux_arm.hpp" 839 #endif 840 #ifdef TARGET_OS_ARCH_linux_ppc 841 # include "os_linux_ppc.hpp" 842 #endif 843 #ifdef TARGET_OS_ARCH_aix_ppc 844 # include "os_aix_ppc.hpp" 845 #endif 846 #ifdef TARGET_OS_ARCH_bsd_x86 847 # include "os_bsd_x86.hpp" 848 #endif 849 #ifdef TARGET_OS_ARCH_bsd_zero 850 # include "os_bsd_zero.hpp" 851 #endif 852 853 public: 854 #ifndef PLATFORM_PRINT_NATIVE_STACK 855 // No platform-specific code for printing the native stack. 856 static bool platform_print_native_stack(outputStream* st, void* context, 857 char *buf, int buf_size) { 858 return false; 859 } 860 #endif 861 862 // debugging support (mostly used by debug.cpp but also fatal error handler) 863 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address 864 865 static bool dont_yield(); // when true, JVM_Yield() is nop 866 static void print_statistics(); 867 868 // Thread priority helpers (implemented in OS-specific part) 869 static OSReturn set_native_priority(Thread* thread, int native_prio); 870 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); 871 static int java_to_os_priority[CriticalPriority + 1]; 872 // Hint to the underlying OS that a task switch would not be good. 873 // Void return because it's a hint and can fail. 874 static void hint_no_preempt(); 875 876 // Used at creation if requested by the diagnostic flag PauseAtStartup. 877 // Causes the VM to wait until an external stimulus has been applied 878 // (for Unix, that stimulus is a signal, for Windows, an external 879 // ResumeThread call) 880 static void pause(); 881 882 // Builds a platform dependent Agent_OnLoad_<libname> function name 883 // which is used to find statically linked in agents. 884 static char* build_agent_function_name(const char *sym, const char *cname, 885 bool is_absolute_path); 886 887 class SuspendedThreadTaskContext { 888 public: 889 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {} 890 Thread* thread() const { return _thread; } 891 void* ucontext() const { return _ucontext; } 892 private: 893 Thread* _thread; 894 void* _ucontext; 895 }; 896 897 class SuspendedThreadTask { 898 public: 899 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {} 900 virtual ~SuspendedThreadTask() {} 901 void run(); 902 bool is_done() { return _done; } 903 virtual void do_task(const SuspendedThreadTaskContext& context) = 0; 904 protected: 905 private: 906 void internal_do_task(); 907 Thread* _thread; 908 bool _done; 909 }; 910 911 #ifndef TARGET_OS_FAMILY_windows 912 // Suspend/resume support 913 // Protocol: 914 // 915 // a thread starts in SR_RUNNING 916 // 917 // SR_RUNNING can go to 918 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it 919 // SR_SUSPEND_REQUEST can go to 920 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout) 921 // * SR_SUSPENDED if the stopped thread receives the signal and switches state 922 // SR_SUSPENDED can go to 923 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume 924 // SR_WAKEUP_REQUEST can go to 925 // * SR_RUNNING when the stopped thread receives the signal 926 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again) 927 class SuspendResume { 928 public: 929 enum State { 930 SR_RUNNING, 931 SR_SUSPEND_REQUEST, 932 SR_SUSPENDED, 933 SR_WAKEUP_REQUEST 934 }; 935 936 private: 937 volatile State _state; 938 939 private: 940 /* try to switch state from state "from" to state "to" 941 * returns the state set after the method is complete 942 */ 943 State switch_state(State from, State to); 944 945 public: 946 SuspendResume() : _state(SR_RUNNING) { } 947 948 State state() const { return _state; } 949 950 State request_suspend() { 951 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST); 952 } 953 954 State cancel_suspend() { 955 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING); 956 } 957 958 State suspended() { 959 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED); 960 } 961 962 State request_wakeup() { 963 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST); 964 } 965 966 State running() { 967 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING); 968 } 969 970 bool is_running() const { 971 return _state == SR_RUNNING; 972 } 973 974 bool is_suspend_request() const { 975 return _state == SR_SUSPEND_REQUEST; 976 } 977 978 bool is_suspended() const { 979 return _state == SR_SUSPENDED; 980 } 981 }; 982 #endif 983 984 985 protected: 986 static long _rand_seed; // seed for random number generator 987 static int _processor_count; // number of processors 988 static int _initial_active_processor_count; // number of active processors during initialization. 989 990 static char* format_boot_path(const char* format_string, 991 const char* home, 992 int home_len, 993 char fileSep, 994 char pathSep); 995 static bool set_boot_path(char fileSep, char pathSep); 996 static char** split_path(const char* path, int* n); 997 998 }; 999 1000 // Note that "PAUSE" is almost always used with synchronization 1001 // so arguably we should provide Atomic::SpinPause() instead 1002 // of the global SpinPause() with C linkage. 1003 // It'd also be eligible for inlining on many platforms. 1004 1005 extern "C" int SpinPause(); 1006 1007 #endif // SHARE_VM_RUNTIME_OS_HPP