os.hpp revision 9651:f7dc8eebc3f5
1/* 2 * Copyright (c) 1997, 2015, 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/extendedPC.hpp" 30#include "runtime/handles.hpp" 31#include "utilities/top.hpp" 32#ifdef TARGET_OS_FAMILY_linux 33# include "jvm_linux.h" 34# include <setjmp.h> 35#endif 36#ifdef TARGET_OS_FAMILY_solaris 37# include "jvm_solaris.h" 38# include <setjmp.h> 39#endif 40#ifdef TARGET_OS_FAMILY_windows 41# include "jvm_windows.h" 42#endif 43#ifdef TARGET_OS_FAMILY_aix 44# include "jvm_aix.h" 45# include <setjmp.h> 46#endif 47#ifdef TARGET_OS_FAMILY_bsd 48# include "jvm_bsd.h" 49# include <setjmp.h> 50# ifdef __APPLE__ 51# include <mach/mach_time.h> 52# endif 53#endif 54 55class AgentLibrary; 56 57// os defines the interface to operating system; this includes traditional 58// OS services (time, I/O) as well as other functionality with system- 59// dependent code. 60 61typedef void (*dll_func)(...); 62 63class Thread; 64class JavaThread; 65class Event; 66class DLL; 67class FileHandle; 68class NativeCallStack; 69 70template<class E> class GrowableArray; 71 72// %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose 73 74// Platform-independent error return values from OS functions 75enum OSReturn { 76 OS_OK = 0, // Operation was successful 77 OS_ERR = -1, // Operation failed 78 OS_INTRPT = -2, // Operation was interrupted 79 OS_TIMEOUT = -3, // Operation timed out 80 OS_NOMEM = -5, // Operation failed for lack of memory 81 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource 82}; 83 84enum ThreadPriority { // JLS 20.20.1-3 85 NoPriority = -1, // Initial non-priority value 86 MinPriority = 1, // Minimum priority 87 NormPriority = 5, // Normal (non-daemon) priority 88 NearMaxPriority = 9, // High priority, used for VMThread 89 MaxPriority = 10, // Highest priority, used for WatcherThread 90 // ensures that VMThread doesn't starve profiler 91 CriticalPriority = 11 // Critical thread priority 92}; 93 94// Executable parameter flag for os::commit_memory() and 95// os::commit_memory_or_exit(). 96const bool ExecMem = true; 97 98// Typedef for structured exception handling support 99typedef void (*java_call_t)(JavaValue* value, const methodHandle& method, JavaCallArguments* args, Thread* thread); 100 101class MallocTracker; 102 103class os: AllStatic { 104 friend class VMStructs; 105 friend class MallocTracker; 106 public: 107 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) 108 109 private: 110 static OSThread* _starting_thread; 111 static address _polling_page; 112 static volatile int32_t * _mem_serialize_page; 113 static uintptr_t _serialize_page_mask; 114 public: 115 static size_t _page_sizes[page_sizes_max]; 116 117 private: 118 static void init_page_sizes(size_t default_page_size) { 119 _page_sizes[0] = default_page_size; 120 _page_sizes[1] = 0; // sentinel 121 } 122 123 static char* pd_reserve_memory(size_t bytes, char* addr = 0, 124 size_t alignment_hint = 0); 125 static char* pd_attempt_reserve_memory_at(size_t bytes, char* addr); 126 static void pd_split_reserved_memory(char *base, size_t size, 127 size_t split, bool realloc); 128 static bool pd_commit_memory(char* addr, size_t bytes, bool executable); 129 static bool pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 130 bool executable); 131 // Same as pd_commit_memory() that either succeeds or calls 132 // vm_exit_out_of_memory() with the specified mesg. 133 static void pd_commit_memory_or_exit(char* addr, size_t bytes, 134 bool executable, const char* mesg); 135 static void pd_commit_memory_or_exit(char* addr, size_t size, 136 size_t alignment_hint, 137 bool executable, const char* mesg); 138 static bool pd_uncommit_memory(char* addr, size_t bytes); 139 static bool pd_release_memory(char* addr, size_t bytes); 140 141 static char* pd_map_memory(int fd, const char* file_name, size_t file_offset, 142 char *addr, size_t bytes, bool read_only = false, 143 bool allow_exec = false); 144 static char* pd_remap_memory(int fd, const char* file_name, size_t file_offset, 145 char *addr, size_t bytes, bool read_only, 146 bool allow_exec); 147 static bool pd_unmap_memory(char *addr, size_t bytes); 148 static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint); 149 static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint); 150 151 static size_t page_size_for_region(size_t region_size, size_t min_pages, bool must_be_aligned); 152 153 // Get summary strings for system information in buffer provided 154 static bool get_host_name(char* buf, size_t buflen) PRODUCT_RETURN_(return false;); // true if available 155 static void get_summary_cpu_info(char* buf, size_t buflen); 156 static void get_summary_os_info(char* buf, size_t buflen); 157 158 public: 159 static void init(void); // Called before command line parsing 160 static void init_before_ergo(void); // Called after command line parsing 161 // before VM ergonomics processing. 162 static jint init_2(void); // Called after command line parsing 163 // and VM ergonomics processing 164 static void init_globals(void) { // Called from init_globals() in init.cpp 165 init_globals_ext(); 166 } 167 168 // File names are case-insensitive on windows only 169 // Override me as needed 170 static int file_name_strcmp(const char* s1, const char* s2); 171 172 // unset environment variable 173 static bool unsetenv(const char* name); 174 175 static bool have_special_privileges(); 176 177 static jlong javaTimeMillis(); 178 static jlong javaTimeNanos(); 179 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); 180 static void javaTimeSystemUTC(jlong &seconds, jlong &nanos); 181 static void run_periodic_checks(); 182 static bool supports_monotonic_clock(); 183 184 // Returns the elapsed time in seconds since the vm started. 185 static double elapsedTime(); 186 187 // Returns real time in seconds since an arbitrary point 188 // in the past. 189 static bool getTimesSecs(double* process_real_time, 190 double* process_user_time, 191 double* process_system_time); 192 193 // Interface to the performance counter 194 static jlong elapsed_counter(); 195 static jlong elapsed_frequency(); 196 197 // The "virtual time" of a thread is the amount of time a thread has 198 // actually run. The first function indicates whether the OS supports 199 // this functionality for the current thread, and if so: 200 // * the second enables vtime tracking (if that is required). 201 // * the third tells whether vtime is enabled. 202 // * the fourth returns the elapsed virtual time for the current 203 // thread. 204 static bool supports_vtime(); 205 static bool enable_vtime(); 206 static bool vtime_enabled(); 207 static double elapsedVTime(); 208 209 // Return current local time in a string (YYYY-MM-DD HH:MM:SS). 210 // It is MT safe, but not async-safe, as reading time zone 211 // information may require a lock on some platforms. 212 static char* local_time_string(char *buf, size_t buflen); 213 static struct tm* localtime_pd (const time_t* clock, struct tm* res); 214 // Fill in buffer with current local time as an ISO-8601 string. 215 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. 216 // Returns buffer, or NULL if it failed. 217 static char* iso8601_time(char* buffer, size_t buffer_length); 218 219 // Interface for detecting multiprocessor system 220 static inline bool is_MP() { 221 // During bootstrap if _processor_count is not yet initialized 222 // we claim to be MP as that is safest. If any platform has a 223 // stub generator that might be triggered in this phase and for 224 // which being declared MP when in fact not, is a problem - then 225 // the bootstrap routine for the stub generator needs to check 226 // the processor count directly and leave the bootstrap routine 227 // in place until called after initialization has ocurred. 228 return (_processor_count != 1) || AssumeMP; 229 } 230 static julong available_memory(); 231 static julong physical_memory(); 232 static bool has_allocatable_memory_limit(julong* limit); 233 static bool is_server_class_machine(); 234 235 // number of CPUs 236 static int processor_count() { 237 return _processor_count; 238 } 239 static void set_processor_count(int count) { _processor_count = count; } 240 241 // Returns the number of CPUs this process is currently allowed to run on. 242 // Note that on some OSes this can change dynamically. 243 static int active_processor_count(); 244 245 // Bind processes to processors. 246 // This is a two step procedure: 247 // first you generate a distribution of processes to processors, 248 // then you bind processes according to that distribution. 249 // Compute a distribution for number of processes to processors. 250 // Stores the processor id's into the distribution array argument. 251 // Returns true if it worked, false if it didn't. 252 static bool distribute_processes(uint length, uint* distribution); 253 // Binds the current process to a processor. 254 // Returns true if it worked, false if it didn't. 255 static bool bind_to_processor(uint processor_id); 256 257 // Give a name to the current thread. 258 static void set_native_thread_name(const char *name); 259 260 // Interface for stack banging (predetect possible stack overflow for 261 // exception processing) There are guard pages, and above that shadow 262 // pages for stack overflow checking. 263 static bool uses_stack_guard_pages(); 264 static bool allocate_stack_guard_pages(); 265 static void bang_stack_shadow_pages(); 266 static bool stack_shadow_pages_available(Thread *thread, const methodHandle& method); 267 268 // OS interface to Virtual Memory 269 270 // Return the default page size. 271 static int vm_page_size(); 272 273 // Returns the page size to use for a region of memory. 274 // region_size / min_pages will always be greater than or equal to the 275 // returned value. The returned value will divide region_size. 276 static size_t page_size_for_region_aligned(size_t region_size, size_t min_pages); 277 278 // Returns the page size to use for a region of memory. 279 // region_size / min_pages will always be greater than or equal to the 280 // returned value. The returned value might not divide region_size. 281 static size_t page_size_for_region_unaligned(size_t region_size, size_t min_pages); 282 283 // Return the largest page size that can be used 284 static size_t max_page_size() { 285 // The _page_sizes array is sorted in descending order. 286 return _page_sizes[0]; 287 } 288 289 // Methods for tracing page sizes returned by the above method; enabled by 290 // TracePageSizes. The region_{min,max}_size parameters should be the values 291 // passed to page_size_for_region() and page_size should be the result of that 292 // call. The (optional) base and size parameters should come from the 293 // ReservedSpace base() and size() methods. 294 static void trace_page_sizes(const char* str, const size_t* page_sizes, 295 int count) PRODUCT_RETURN; 296 static void trace_page_sizes(const char* str, const size_t region_min_size, 297 const size_t region_max_size, 298 const size_t page_size, 299 const char* base = NULL, 300 const size_t size = 0) PRODUCT_RETURN; 301 302 static int vm_allocation_granularity(); 303 static char* reserve_memory(size_t bytes, char* addr = 0, 304 size_t alignment_hint = 0); 305 static char* reserve_memory(size_t bytes, char* addr, 306 size_t alignment_hint, MEMFLAGS flags); 307 static char* reserve_memory_aligned(size_t size, size_t alignment); 308 static char* attempt_reserve_memory_at(size_t bytes, char* addr); 309 static void split_reserved_memory(char *base, size_t size, 310 size_t split, bool realloc); 311 static bool commit_memory(char* addr, size_t bytes, bool executable); 312 static bool commit_memory(char* addr, size_t size, size_t alignment_hint, 313 bool executable); 314 // Same as commit_memory() that either succeeds or calls 315 // vm_exit_out_of_memory() with the specified mesg. 316 static void commit_memory_or_exit(char* addr, size_t bytes, 317 bool executable, const char* mesg); 318 static void commit_memory_or_exit(char* addr, size_t size, 319 size_t alignment_hint, 320 bool executable, const char* mesg); 321 static bool uncommit_memory(char* addr, size_t bytes); 322 static bool release_memory(char* addr, size_t bytes); 323 324 // Touch memory pages that cover the memory range from start to end (exclusive) 325 // to make the OS back the memory range with actual memory. 326 // Current implementation may not touch the last page if unaligned addresses 327 // are passed. 328 static void pretouch_memory(char* start, char* end); 329 330 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; 331 static bool protect_memory(char* addr, size_t bytes, ProtType prot, 332 bool is_committed = true); 333 334 static bool guard_memory(char* addr, size_t bytes); 335 static bool unguard_memory(char* addr, size_t bytes); 336 static bool create_stack_guard_pages(char* addr, size_t bytes); 337 static bool pd_create_stack_guard_pages(char* addr, size_t bytes); 338 static bool remove_stack_guard_pages(char* addr, size_t bytes); 339 340 static char* map_memory(int fd, const char* file_name, size_t file_offset, 341 char *addr, size_t bytes, bool read_only = false, 342 bool allow_exec = false); 343 static char* remap_memory(int fd, const char* file_name, size_t file_offset, 344 char *addr, size_t bytes, bool read_only, 345 bool allow_exec); 346 static bool unmap_memory(char *addr, size_t bytes); 347 static void free_memory(char *addr, size_t bytes, size_t alignment_hint); 348 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); 349 350 // NUMA-specific interface 351 static bool numa_has_static_binding(); 352 static bool numa_has_group_homing(); 353 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); 354 static void numa_make_global(char *addr, size_t bytes); 355 static size_t numa_get_groups_num(); 356 static size_t numa_get_leaf_groups(int *ids, size_t size); 357 static bool numa_topology_changed(); 358 static int numa_get_group_id(); 359 360 // Page manipulation 361 struct page_info { 362 size_t size; 363 int lgrp_id; 364 }; 365 static bool get_page_info(char *start, page_info* info); 366 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); 367 368 static char* non_memory_address_word(); 369 // reserve, commit and pin the entire memory region 370 static char* reserve_memory_special(size_t size, size_t alignment, 371 char* addr, bool executable); 372 static bool release_memory_special(char* addr, size_t bytes); 373 static void large_page_init(); 374 static size_t large_page_size(); 375 static bool can_commit_large_page_memory(); 376 static bool can_execute_large_page_memory(); 377 378 // OS interface to polling page 379 static address get_polling_page() { return _polling_page; } 380 static void set_polling_page(address page) { _polling_page = page; } 381 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } 382 static void make_polling_page_unreadable(); 383 static void make_polling_page_readable(); 384 385 // Routines used to serialize the thread state without using membars 386 static void serialize_thread_states(); 387 388 // Since we write to the serialize page from every thread, we 389 // want stores to be on unique cache lines whenever possible 390 // in order to minimize CPU cross talk. We pre-compute the 391 // amount to shift the thread* to make this offset unique to 392 // each thread. 393 static int get_serialize_page_shift_count() { 394 return SerializePageShiftCount; 395 } 396 397 static void set_serialize_page_mask(uintptr_t mask) { 398 _serialize_page_mask = mask; 399 } 400 401 static unsigned int get_serialize_page_mask() { 402 return _serialize_page_mask; 403 } 404 405 static void set_memory_serialize_page(address page); 406 407 static address get_memory_serialize_page() { 408 return (address)_mem_serialize_page; 409 } 410 411 static inline void write_memory_serialize_page(JavaThread *thread) { 412 uintptr_t page_offset = ((uintptr_t)thread >> 413 get_serialize_page_shift_count()) & 414 get_serialize_page_mask(); 415 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; 416 } 417 418 static bool is_memory_serialize_page(JavaThread *thread, address addr) { 419 if (UseMembar) return false; 420 // Previously this function calculated the exact address of this 421 // thread's serialize page, and checked if the faulting address 422 // was equal. However, some platforms mask off faulting addresses 423 // to the page size, so now we just check that the address is 424 // within the page. This makes the thread argument unnecessary, 425 // but we retain the NULL check to preserve existing behavior. 426 if (thread == NULL) return false; 427 address page = (address) _mem_serialize_page; 428 return addr >= page && addr < (page + os::vm_page_size()); 429 } 430 431 static void block_on_serialize_page_trap(); 432 433 // threads 434 435 enum ThreadType { 436 vm_thread, 437 cgc_thread, // Concurrent GC thread 438 pgc_thread, // Parallel GC thread 439 java_thread, 440 compiler_thread, 441 watcher_thread, 442 os_thread 443 }; 444 445 static bool create_thread(Thread* thread, 446 ThreadType thr_type, 447 size_t stack_size = 0); 448 static bool create_main_thread(JavaThread* thread); 449 static bool create_attached_thread(JavaThread* thread); 450 static void pd_start_thread(Thread* thread); 451 static void start_thread(Thread* thread); 452 453 static void initialize_thread(Thread* thr); 454 static void free_thread(OSThread* osthread); 455 456 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit 457 static intx current_thread_id(); 458 static int current_process_id(); 459 static int sleep(Thread* thread, jlong ms, bool interruptable); 460 // Short standalone OS sleep suitable for slow path spin loop. 461 // Ignores Thread.interrupt() (so keep it short). 462 // ms = 0, will sleep for the least amount of time allowed by the OS. 463 static void naked_short_sleep(jlong ms); 464 static void infinite_sleep(); // never returns, use with CAUTION 465 static void naked_yield () ; 466 static OSReturn set_priority(Thread* thread, ThreadPriority priority); 467 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); 468 469 static void interrupt(Thread* thread); 470 static bool is_interrupted(Thread* thread, bool clear_interrupted); 471 472 static int pd_self_suspend_thread(Thread* thread); 473 474 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); 475 static frame fetch_frame_from_context(void* ucVoid); 476 477 static ExtendedPC get_thread_pc(Thread *thread); 478 static void breakpoint(); 479 static bool start_debugging(char *buf, int buflen); 480 481 static address current_stack_pointer(); 482 static address current_stack_base(); 483 static size_t current_stack_size(); 484 485 static void verify_stack_alignment() PRODUCT_RETURN; 486 487 static bool message_box(const char* title, const char* message); 488 static char* do_you_want_to_debug(const char* message); 489 490 // run cmd in a separate process and return its exit code; or -1 on failures 491 static int fork_and_exec(char *cmd); 492 493 // Call ::exit() on all platforms but Windows 494 static void exit(int num); 495 496 // Terminate the VM, but don't exit the process 497 static void shutdown(); 498 499 // Terminate with an error. Default is to generate a core file on platforms 500 // that support such things. This calls shutdown() and then aborts. 501 static void abort(bool dump_core, void *siginfo, void *context); 502 static void abort(bool dump_core = true); 503 504 // Die immediately, no exit hook, no abort hook, no cleanup. 505 static void die(); 506 507 // File i/o operations 508 static const int default_file_open_flags(); 509 static int open(const char *path, int oflag, int mode); 510 static FILE* open(int fd, const char* mode); 511 static int close(int fd); 512 static jlong lseek(int fd, jlong offset, int whence); 513 static char* native_path(char *path); 514 static int ftruncate(int fd, jlong length); 515 static int fsync(int fd); 516 static int available(int fd, jlong *bytes); 517 518 //File i/o operations 519 520 static size_t read(int fd, void *buf, unsigned int nBytes); 521 static size_t read_at(int fd, void *buf, unsigned int nBytes, jlong offset); 522 static size_t restartable_read(int fd, void *buf, unsigned int nBytes); 523 static size_t write(int fd, const void *buf, unsigned int nBytes); 524 525 // Reading directories. 526 static DIR* opendir(const char* dirname); 527 static int readdir_buf_size(const char *path); 528 static struct dirent* readdir(DIR* dirp, dirent* dbuf); 529 static int closedir(DIR* dirp); 530 531 // Dynamic library extension 532 static const char* dll_file_extension(); 533 534 static const char* get_temp_directory(); 535 static const char* get_current_directory(char *buf, size_t buflen); 536 537 // Builds a platform-specific full library path given a ld path and lib name 538 // Returns true if buffer contains full path to existing file, false otherwise 539 static bool dll_build_name(char* buffer, size_t size, 540 const char* pathname, const char* fname); 541 542 // Symbol lookup, find nearest function name; basically it implements 543 // dladdr() for all platforms. Name of the nearest function is copied 544 // to buf. Distance from its base address is optionally returned as offset. 545 // If function name is not found, buf[0] is set to '\0' and offset is 546 // set to -1 (if offset is non-NULL). 547 static bool dll_address_to_function_name(address addr, char* buf, 548 int buflen, int* offset, 549 bool demangle = true); 550 551 // Locate DLL/DSO. On success, full path of the library is copied to 552 // buf, and offset is optionally set to be the distance between addr 553 // and the library's base address. On failure, buf[0] is set to '\0' 554 // and offset is set to -1 (if offset is non-NULL). 555 static bool dll_address_to_library_name(address addr, char* buf, 556 int buflen, int* offset); 557 558 // Find out whether the pc is in the static code for jvm.dll/libjvm.so. 559 static bool address_is_in_vm(address addr); 560 561 // Loads .dll/.so and 562 // in case of error it checks if .dll/.so was built for the 563 // same architecture as HotSpot is running on 564 static void* dll_load(const char *name, char *ebuf, int ebuflen); 565 566 // lookup symbol in a shared library 567 static void* dll_lookup(void* handle, const char* name); 568 569 // Unload library 570 static void dll_unload(void *lib); 571 572 // Callback for loaded module information 573 // Input parameters: 574 // char* module_file_name, 575 // address module_base_addr, 576 // address module_top_addr, 577 // void* param 578 typedef int (*LoadedModulesCallbackFunc)(const char *, address, address, void *); 579 580 static int get_loaded_modules_info(LoadedModulesCallbackFunc callback, void *param); 581 582 // Return the handle of this process 583 static void* get_default_process_handle(); 584 585 // Check for static linked agent library 586 static bool find_builtin_agent(AgentLibrary *agent_lib, const char *syms[], 587 size_t syms_len); 588 589 // Find agent entry point 590 static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib, 591 const char *syms[], size_t syms_len); 592 593 // Write to stream 594 static int log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) ATTRIBUTE_PRINTF(3, 0); 595 596 // Print out system information; they are called by fatal error handler. 597 // Output format may be different on different platforms. 598 static void print_os_info(outputStream* st); 599 static void print_os_info_brief(outputStream* st); 600 static void print_cpu_info(outputStream* st, char* buf, size_t buflen); 601 static void pd_print_cpu_info(outputStream* st, char* buf, size_t buflen); 602 static void print_summary_info(outputStream* st, char* buf, size_t buflen); 603 static void print_memory_info(outputStream* st); 604 static void print_dll_info(outputStream* st); 605 static void print_environment_variables(outputStream* st, const char** env_list); 606 static void print_context(outputStream* st, void* context); 607 static void print_register_info(outputStream* st, void* context); 608 static void print_siginfo(outputStream* st, void* siginfo); 609 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); 610 static void print_date_and_time(outputStream* st, char* buf, size_t buflen); 611 612 static void print_location(outputStream* st, intptr_t x, bool verbose = false); 613 static size_t lasterror(char *buf, size_t len); 614 static int get_last_error(); 615 616 // Determines whether the calling process is being debugged by a user-mode debugger. 617 static bool is_debugger_attached(); 618 619 // wait for a key press if PauseAtExit is set 620 static void wait_for_keypress_at_exit(void); 621 622 // The following two functions are used by fatal error handler to trace 623 // native (C) frames. They are not part of frame.hpp/frame.cpp because 624 // frame.hpp/cpp assume thread is JavaThread, and also because different 625 // OS/compiler may have different convention or provide different API to 626 // walk C frames. 627 // 628 // We don't attempt to become a debugger, so we only follow frames if that 629 // does not require a lookup in the unwind table, which is part of the binary 630 // file but may be unsafe to read after a fatal error. So on x86, we can 631 // only walk stack if %ebp is used as frame pointer; on ia64, it's not 632 // possible to walk C stack without having the unwind table. 633 static bool is_first_C_frame(frame *fr); 634 static frame get_sender_for_C_frame(frame *fr); 635 636 // return current frame. pc() and sp() are set to NULL on failure. 637 static frame current_frame(); 638 639 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); 640 641 // returns a string to describe the exception/signal; 642 // returns NULL if exception_code is not an OS exception/signal. 643 static const char* exception_name(int exception_code, char* buf, size_t buflen); 644 645 // Returns the signal number (e.g. 11) for a given signal name (SIGSEGV). 646 static int get_signal_number(const char* signal_name); 647 648 // Returns native Java library, loads if necessary 649 static void* native_java_library(); 650 651 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler) 652 static void jvm_path(char *buf, jint buflen); 653 654 // Returns true if we are running in a headless jre. 655 static bool is_headless_jre(); 656 657 // JNI names 658 static void print_jni_name_prefix_on(outputStream* st, int args_size); 659 static void print_jni_name_suffix_on(outputStream* st, int args_size); 660 661 // Init os specific system properties values 662 static void init_system_properties_values(); 663 664 // IO operations, non-JVM_ version. 665 static int stat(const char* path, struct stat* sbuf); 666 static bool dir_is_empty(const char* path); 667 668 // IO operations on binary files 669 static int create_binary_file(const char* path, bool rewrite_existing); 670 static jlong current_file_offset(int fd); 671 static jlong seek_to_file_offset(int fd, jlong offset); 672 673 // Retrieve native stack frames. 674 // Parameter: 675 // stack: an array to storage stack pointers. 676 // frames: size of above array. 677 // toSkip: number of stack frames to skip at the beginning. 678 // Return: number of stack frames captured. 679 static int get_native_stack(address* stack, int size, int toSkip = 0); 680 681 // General allocation (must be MT-safe) 682 static void* malloc (size_t size, MEMFLAGS flags, const NativeCallStack& stack); 683 static void* malloc (size_t size, MEMFLAGS flags); 684 static void* realloc (void *memblock, size_t size, MEMFLAGS flag, const NativeCallStack& stack); 685 static void* realloc (void *memblock, size_t size, MEMFLAGS flag); 686 687 static void free (void *memblock); 688 static bool check_heap(bool force = false); // verify C heap integrity 689 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup 690 // Like strdup, but exit VM when strdup() returns NULL 691 static char* strdup_check_oom(const char*, MEMFLAGS flags = mtInternal); 692 693#ifndef PRODUCT 694 static julong num_mallocs; // # of calls to malloc/realloc 695 static julong alloc_bytes; // # of bytes allocated 696 static julong num_frees; // # of calls to free 697 static julong free_bytes; // # of bytes freed 698#endif 699 700 // SocketInterface (ex HPI SocketInterface ) 701 static int socket(int domain, int type, int protocol); 702 static int socket_close(int fd); 703 static int recv(int fd, char* buf, size_t nBytes, uint flags); 704 static int send(int fd, char* buf, size_t nBytes, uint flags); 705 static int raw_send(int fd, char* buf, size_t nBytes, uint flags); 706 static int connect(int fd, struct sockaddr* him, socklen_t len); 707 static struct hostent* get_host_by_name(char* name); 708 709 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) 710 static void signal_init(); 711 static void signal_init_pd(); 712 static void signal_notify(int signal_number); 713 static void* signal(int signal_number, void* handler); 714 static void signal_raise(int signal_number); 715 static int signal_wait(); 716 static int signal_lookup(); 717 static void* user_handler(); 718 static void terminate_signal_thread(); 719 static int sigexitnum_pd(); 720 721 // random number generation 722 static long random(); // return 32bit pseudorandom number 723 static void init_random(long initval); // initialize random sequence 724 725 // Structured OS Exception support 726 static void os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method, JavaCallArguments* args, Thread* thread); 727 728 // On Posix compatible OS it will simply check core dump limits while on Windows 729 // it will check if dump file can be created. Check or prepare a core dump to be 730 // taken at a later point in the same thread in os::abort(). Use the caller 731 // provided buffer as a scratch buffer. The status message which will be written 732 // into the error log either is file location or a short error message, depending 733 // on the checking result. 734 static void check_dump_limit(char* buffer, size_t bufferSize); 735 736 // Get the default path to the core file 737 // Returns the length of the string 738 static int get_core_path(char* buffer, size_t bufferSize); 739 740 // JVMTI & JVM monitoring and management support 741 // The thread_cpu_time() and current_thread_cpu_time() are only 742 // supported if is_thread_cpu_time_supported() returns true. 743 // They are not supported on Solaris T1. 744 745 // Thread CPU Time - return the fast estimate on a platform 746 // On Solaris - call gethrvtime (fast) - user time only 747 // On Linux - fast clock_gettime where available - user+sys 748 // - otherwise: very slow /proc fs - user+sys 749 // On Windows - GetThreadTimes - user+sys 750 static jlong current_thread_cpu_time(); 751 static jlong thread_cpu_time(Thread* t); 752 753 // Thread CPU Time with user_sys_cpu_time parameter. 754 // 755 // If user_sys_cpu_time is true, user+sys time is returned. 756 // Otherwise, only user time is returned 757 static jlong current_thread_cpu_time(bool user_sys_cpu_time); 758 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); 759 760 // Return a bunch of info about the timers. 761 // Note that the returned info for these two functions may be different 762 // on some platforms 763 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 764 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 765 766 static bool is_thread_cpu_time_supported(); 767 768 // System loadavg support. Returns -1 if load average cannot be obtained. 769 static int loadavg(double loadavg[], int nelem); 770 771 // Hook for os specific jvm options that we don't want to abort on seeing 772 static bool obsolete_option(const JavaVMOption *option); 773 774 // Amount beyond the callee frame size that we bang the stack. 775 static int extra_bang_size_in_bytes(); 776 777 // Extensions 778#include "runtime/os_ext.hpp" 779 780 public: 781 class CrashProtectionCallback : public StackObj { 782 public: 783 virtual void call() = 0; 784 }; 785 786 // Platform dependent stuff 787#ifdef TARGET_OS_FAMILY_linux 788# include "os_linux.hpp" 789# include "os_posix.hpp" 790#endif 791#ifdef TARGET_OS_FAMILY_solaris 792# include "os_solaris.hpp" 793# include "os_posix.hpp" 794#endif 795#ifdef TARGET_OS_FAMILY_windows 796# include "os_windows.hpp" 797#endif 798#ifdef TARGET_OS_FAMILY_aix 799# include "os_aix.hpp" 800# include "os_posix.hpp" 801#endif 802#ifdef TARGET_OS_FAMILY_bsd 803# include "os_posix.hpp" 804# include "os_bsd.hpp" 805#endif 806#ifdef TARGET_OS_ARCH_linux_x86 807# include "os_linux_x86.hpp" 808#endif 809#ifdef TARGET_OS_ARCH_linux_sparc 810# include "os_linux_sparc.hpp" 811#endif 812#ifdef TARGET_OS_ARCH_linux_zero 813# include "os_linux_zero.hpp" 814#endif 815#ifdef TARGET_OS_ARCH_solaris_x86 816# include "os_solaris_x86.hpp" 817#endif 818#ifdef TARGET_OS_ARCH_solaris_sparc 819# include "os_solaris_sparc.hpp" 820#endif 821#ifdef TARGET_OS_ARCH_windows_x86 822# include "os_windows_x86.hpp" 823#endif 824#ifdef TARGET_OS_ARCH_linux_arm 825# include "os_linux_arm.hpp" 826#endif 827#ifdef TARGET_OS_ARCH_linux_ppc 828# include "os_linux_ppc.hpp" 829#endif 830#ifdef TARGET_OS_ARCH_aix_ppc 831# include "os_aix_ppc.hpp" 832#endif 833#ifdef TARGET_OS_ARCH_linux_aarch64 834# include "os_linux_aarch64.hpp" 835#endif 836#ifdef TARGET_OS_ARCH_bsd_x86 837# include "os_bsd_x86.hpp" 838#endif 839#ifdef TARGET_OS_ARCH_bsd_zero 840# include "os_bsd_zero.hpp" 841#endif 842 843#ifndef OS_NATIVE_THREAD_CREATION_FAILED_MSG 844#define OS_NATIVE_THREAD_CREATION_FAILED_MSG "unable to create native thread: possibly out of memory or process/resource limits reached" 845#endif 846 847 public: 848#ifndef PLATFORM_PRINT_NATIVE_STACK 849 // No platform-specific code for printing the native stack. 850 static bool platform_print_native_stack(outputStream* st, void* context, 851 char *buf, int buf_size) { 852 return false; 853 } 854#endif 855 856 // debugging support (mostly used by debug.cpp but also fatal error handler) 857 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address 858 859 static bool dont_yield(); // when true, JVM_Yield() is nop 860 static void print_statistics(); 861 862 // Thread priority helpers (implemented in OS-specific part) 863 static OSReturn set_native_priority(Thread* thread, int native_prio); 864 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); 865 static int java_to_os_priority[CriticalPriority + 1]; 866 // Hint to the underlying OS that a task switch would not be good. 867 // Void return because it's a hint and can fail. 868 static void hint_no_preempt(); 869 static const char* native_thread_creation_failed_msg() { 870 return OS_NATIVE_THREAD_CREATION_FAILED_MSG; 871 } 872 873 // Used at creation if requested by the diagnostic flag PauseAtStartup. 874 // Causes the VM to wait until an external stimulus has been applied 875 // (for Unix, that stimulus is a signal, for Windows, an external 876 // ResumeThread call) 877 static void pause(); 878 879 // Builds a platform dependent Agent_OnLoad_<libname> function name 880 // which is used to find statically linked in agents. 881 static char* build_agent_function_name(const char *sym, const char *cname, 882 bool is_absolute_path); 883 884 class SuspendedThreadTaskContext { 885 public: 886 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {} 887 Thread* thread() const { return _thread; } 888 void* ucontext() const { return _ucontext; } 889 private: 890 Thread* _thread; 891 void* _ucontext; 892 }; 893 894 class SuspendedThreadTask { 895 public: 896 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {} 897 virtual ~SuspendedThreadTask() {} 898 void run(); 899 bool is_done() { return _done; } 900 virtual void do_task(const SuspendedThreadTaskContext& context) = 0; 901 protected: 902 private: 903 void internal_do_task(); 904 Thread* _thread; 905 bool _done; 906 }; 907 908#ifndef TARGET_OS_FAMILY_windows 909 // Suspend/resume support 910 // Protocol: 911 // 912 // a thread starts in SR_RUNNING 913 // 914 // SR_RUNNING can go to 915 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it 916 // SR_SUSPEND_REQUEST can go to 917 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout) 918 // * SR_SUSPENDED if the stopped thread receives the signal and switches state 919 // SR_SUSPENDED can go to 920 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume 921 // SR_WAKEUP_REQUEST can go to 922 // * SR_RUNNING when the stopped thread receives the signal 923 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again) 924 class SuspendResume { 925 public: 926 enum State { 927 SR_RUNNING, 928 SR_SUSPEND_REQUEST, 929 SR_SUSPENDED, 930 SR_WAKEUP_REQUEST 931 }; 932 933 private: 934 volatile State _state; 935 936 private: 937 /* try to switch state from state "from" to state "to" 938 * returns the state set after the method is complete 939 */ 940 State switch_state(State from, State to); 941 942 public: 943 SuspendResume() : _state(SR_RUNNING) { } 944 945 State state() const { return _state; } 946 947 State request_suspend() { 948 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST); 949 } 950 951 State cancel_suspend() { 952 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING); 953 } 954 955 State suspended() { 956 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED); 957 } 958 959 State request_wakeup() { 960 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST); 961 } 962 963 State running() { 964 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING); 965 } 966 967 bool is_running() const { 968 return _state == SR_RUNNING; 969 } 970 971 bool is_suspend_request() const { 972 return _state == SR_SUSPEND_REQUEST; 973 } 974 975 bool is_suspended() const { 976 return _state == SR_SUSPENDED; 977 } 978 }; 979#endif 980 981 982 protected: 983 static long _rand_seed; // seed for random number generator 984 static int _processor_count; // number of processors 985 986 static char* format_boot_path(const char* format_string, 987 const char* home, 988 int home_len, 989 char fileSep, 990 char pathSep); 991 static bool set_boot_path(char fileSep, char pathSep); 992 static char** split_path(const char* path, int* n); 993 994}; 995 996// Note that "PAUSE" is almost always used with synchronization 997// so arguably we should provide Atomic::SpinPause() instead 998// of the global SpinPause() with C linkage. 999// It'd also be eligible for inlining on many platforms. 1000 1001extern "C" int SpinPause(); 1002 1003#endif // SHARE_VM_RUNTIME_OS_HPP 1004