1 /* 2 * Copyright (c) 1997, 2016, 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 #ifdef TARGET_OS_FAMILY_linux 32 # include "jvm_linux.h" 33 # include <setjmp.h> 34 #endif 35 #ifdef TARGET_OS_FAMILY_solaris 36 # include "jvm_solaris.h" 37 # include <setjmp.h> 38 #endif 39 #ifdef TARGET_OS_FAMILY_windows 40 # include "jvm_windows.h" 41 #endif 42 #ifdef TARGET_OS_FAMILY_aix 43 # include "jvm_aix.h" 44 # include <setjmp.h> 45 #endif 46 #ifdef TARGET_OS_FAMILY_bsd 47 # include "jvm_bsd.h" 48 # include <setjmp.h> 49 # ifdef __APPLE__ 50 # include <mach/mach_time.h> 51 # endif 52 #endif 53 54 class AgentLibrary; 55 56 // os defines the interface to operating system; this includes traditional 57 // OS services (time, I/O) as well as other functionality with system- 58 // dependent code. 59 60 typedef void (*dll_func)(...); 61 62 class Thread; 63 class JavaThread; 64 class Event; 65 class DLL; 66 class FileHandle; 67 class NativeCallStack; 68 69 template<class E> class GrowableArray; 70 71 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose 72 73 // Platform-independent error return values from OS functions 74 enum OSReturn { 75 OS_OK = 0, // Operation was successful 76 OS_ERR = -1, // Operation failed 77 OS_INTRPT = -2, // Operation was interrupted 78 OS_TIMEOUT = -3, // Operation timed out 79 OS_NOMEM = -5, // Operation failed for lack of memory 80 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource 81 }; 82 83 enum ThreadPriority { // JLS 20.20.1-3 84 NoPriority = -1, // Initial non-priority value 85 MinPriority = 1, // Minimum priority 86 NormPriority = 5, // Normal (non-daemon) priority 87 NearMaxPriority = 9, // High priority, used for VMThread 88 MaxPriority = 10, // Highest priority, used for WatcherThread 89 // ensures that VMThread doesn't starve profiler 90 CriticalPriority = 11 // Critical thread priority 91 }; 92 93 // Executable parameter flag for os::commit_memory() and 94 // os::commit_memory_or_exit(). 95 const bool ExecMem = true; 96 97 // Typedef for structured exception handling support 98 typedef void (*java_call_t)(JavaValue* value, const methodHandle& method, JavaCallArguments* args, Thread* thread); 99 100 class MallocTracker; 101 102 class os: AllStatic { 103 friend class VMStructs; 104 friend class JVMCIVMStructs; 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 void get_summary_cpu_info(char* buf, size_t buflen); 155 static void get_summary_os_info(char* buf, size_t buflen); 156 157 public: 158 static void init(void); // Called before command line parsing 159 static void init_before_ergo(void); // Called after command line parsing 160 // before VM ergonomics processing. 161 static jint init_2(void); // Called after command line parsing 162 // and VM ergonomics processing 163 static void init_globals(void) { // Called from init_globals() in init.cpp 164 init_globals_ext(); 165 } 166 167 // File names are case-insensitive on windows only 168 // Override me as needed 169 static int file_name_strcmp(const char* s1, const char* s2); 170 171 // unset environment variable 172 static bool unsetenv(const char* name); 173 174 static bool have_special_privileges(); 175 176 static jlong javaTimeMillis(); 177 static jlong javaTimeNanos(); 178 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); 179 static void javaTimeSystemUTC(jlong &seconds, jlong &nanos); 180 static void run_periodic_checks(); 181 static bool supports_monotonic_clock(); 182 183 // Returns the elapsed time in seconds since the vm started. 184 static double elapsedTime(); 185 186 // Returns real time in seconds since an arbitrary point 187 // in the past. 188 static bool getTimesSecs(double* process_real_time, 189 double* process_user_time, 190 double* process_system_time); 191 192 // Interface to the performance counter 193 static jlong elapsed_counter(); 194 static jlong elapsed_frequency(); 195 196 // The "virtual time" of a thread is the amount of time a thread has 197 // actually run. The first function indicates whether the OS supports 198 // this functionality for the current thread, and if so: 199 // * the second enables vtime tracking (if that is required). 200 // * the third tells whether vtime is enabled. 201 // * the fourth returns the elapsed virtual time for the current 202 // thread. 203 static bool supports_vtime(); 204 static bool enable_vtime(); 205 static bool vtime_enabled(); 206 static double elapsedVTime(); 207 208 // Return current local time in a string (YYYY-MM-DD HH:MM:SS). 209 // It is MT safe, but not async-safe, as reading time zone 210 // information may require a lock on some platforms. 211 static char* local_time_string(char *buf, size_t buflen); 212 static struct tm* localtime_pd (const time_t* clock, struct tm* res); 213 // Fill in buffer with current local time as an ISO-8601 string. 214 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. 215 // Returns buffer, or NULL if it failed. 216 static char* iso8601_time(char* buffer, size_t buffer_length); 217 218 // Interface for detecting multiprocessor system 219 static inline bool is_MP() { 220 // During bootstrap if _processor_count is not yet initialized 221 // we claim to be MP as that is safest. If any platform has a 222 // stub generator that might be triggered in this phase and for 223 // which being declared MP when in fact not, is a problem - then 224 // the bootstrap routine for the stub generator needs to check 225 // the processor count directly and leave the bootstrap routine 226 // in place until called after initialization has ocurred. 227 return (_processor_count != 1) || AssumeMP; 228 } 229 static julong available_memory(); 230 static julong physical_memory(); 231 static bool has_allocatable_memory_limit(julong* limit); 232 static bool is_server_class_machine(); 233 234 // number of CPUs 235 static int processor_count() { 236 return _processor_count; 237 } 238 static void set_processor_count(int count) { _processor_count = count; } 239 240 // Returns the number of CPUs this process is currently allowed to run on. 241 // Note that on some OSes this can change dynamically. 242 static int active_processor_count(); 243 244 // Bind processes to processors. 245 // This is a two step procedure: 246 // first you generate a distribution of processes to processors, 247 // then you bind processes according to that distribution. 248 // Compute a distribution for number of processes to processors. 249 // Stores the processor id's into the distribution array argument. 250 // Returns true if it worked, false if it didn't. 251 static bool distribute_processes(uint length, uint* distribution); 252 // Binds the current process to a processor. 253 // Returns true if it worked, false if it didn't. 254 static bool bind_to_processor(uint processor_id); 255 256 // Give a name to the current thread. 257 static void set_native_thread_name(const char *name); 258 259 // Interface for stack banging (predetect possible stack overflow for 260 // exception processing) There are guard pages, and above that shadow 261 // pages for stack overflow checking. 262 static bool uses_stack_guard_pages(); 263 static bool must_commit_stack_guard_pages(); 264 static void map_stack_shadow_pages(address sp); 265 static bool stack_shadow_pages_available(Thread *thread, const methodHandle& method, address sp); 266 267 // OS interface to Virtual Memory 268 269 // Return the default page size. 270 static int vm_page_size(); 271 272 // Returns the page size to use for a region of memory. 273 // region_size / min_pages will always be greater than or equal to the 274 // returned value. The returned value will divide region_size. 275 static size_t page_size_for_region_aligned(size_t region_size, size_t min_pages); 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 might not divide region_size. 280 static size_t page_size_for_region_unaligned(size_t region_size, size_t min_pages); 281 282 // Return the largest page size that can be used 283 static size_t max_page_size() { 284 // The _page_sizes array is sorted in descending order. 285 return _page_sizes[0]; 286 } 287 288 // Methods for tracing page sizes returned by the above method. 289 // The region_{min,max}_size parameters should be the values 290 // passed to page_size_for_region() and page_size should be the result of that 291 // call. The (optional) base and size parameters should come from the 292 // ReservedSpace base() and size() methods. 293 static void trace_page_sizes(const char* str, const size_t* page_sizes, int count); 294 static void trace_page_sizes(const char* str, 295 const size_t region_min_size, 296 const size_t region_max_size, 297 const size_t page_size, 298 const char* base, 299 const size_t size); 300 static void trace_page_sizes_for_requested_size(const char* str, 301 const size_t requested_size, 302 const size_t page_size, 303 const size_t alignment, 304 const char* base, 305 const size_t size); 306 307 static int vm_allocation_granularity(); 308 static char* reserve_memory(size_t bytes, char* addr = 0, 309 size_t alignment_hint = 0); 310 static char* reserve_memory(size_t bytes, char* addr, 311 size_t alignment_hint, MEMFLAGS flags); 312 static char* reserve_memory_aligned(size_t size, size_t alignment); 313 static char* attempt_reserve_memory_at(size_t bytes, char* addr); 314 static void split_reserved_memory(char *base, size_t size, 315 size_t split, bool realloc); 316 static bool commit_memory(char* addr, size_t bytes, bool executable); 317 static bool commit_memory(char* addr, size_t size, size_t alignment_hint, 318 bool executable); 319 // Same as commit_memory() that either succeeds or calls 320 // vm_exit_out_of_memory() with the specified mesg. 321 static void commit_memory_or_exit(char* addr, size_t bytes, 322 bool executable, const char* mesg); 323 static void commit_memory_or_exit(char* addr, size_t size, 324 size_t alignment_hint, 325 bool executable, const char* mesg); 326 static bool uncommit_memory(char* addr, size_t bytes); 327 static bool release_memory(char* addr, size_t bytes); 328 329 // Touch memory pages that cover the memory range from start to end (exclusive) 330 // to make the OS back the memory range with actual memory. 331 // Current implementation may not touch the last page if unaligned addresses 332 // are passed. 333 static void pretouch_memory(void* start, void* end); 334 335 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; 336 static bool protect_memory(char* addr, size_t bytes, ProtType prot, 337 bool is_committed = true); 338 339 static bool guard_memory(char* addr, size_t bytes); 340 static bool unguard_memory(char* addr, size_t bytes); 341 static bool create_stack_guard_pages(char* addr, size_t bytes); 342 static bool pd_create_stack_guard_pages(char* addr, size_t bytes); 343 static bool remove_stack_guard_pages(char* addr, size_t bytes); 344 345 static char* map_memory(int fd, const char* file_name, size_t file_offset, 346 char *addr, size_t bytes, bool read_only = false, 347 bool allow_exec = false); 348 static char* remap_memory(int fd, const char* file_name, size_t file_offset, 349 char *addr, size_t bytes, bool read_only, 350 bool allow_exec); 351 static bool unmap_memory(char *addr, size_t bytes); 352 static void free_memory(char *addr, size_t bytes, size_t alignment_hint); 353 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); 354 355 // NUMA-specific interface 356 static bool numa_has_static_binding(); 357 static bool numa_has_group_homing(); 358 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); 359 static void numa_make_global(char *addr, size_t bytes); 360 static size_t numa_get_groups_num(); 361 static size_t numa_get_leaf_groups(int *ids, size_t size); 362 static bool numa_topology_changed(); 363 static int numa_get_group_id(); 364 365 // Page manipulation 366 struct page_info { 367 size_t size; 368 int lgrp_id; 369 }; 370 static bool get_page_info(char *start, page_info* info); 371 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); 372 373 static char* non_memory_address_word(); 374 // reserve, commit and pin the entire memory region 375 static char* reserve_memory_special(size_t size, size_t alignment, 376 char* addr, bool executable); 377 static bool release_memory_special(char* addr, size_t bytes); 378 static void large_page_init(); 379 static size_t large_page_size(); 380 static bool can_commit_large_page_memory(); 381 static bool can_execute_large_page_memory(); 382 383 // OS interface to polling page 384 static address get_polling_page() { return _polling_page; } 385 static void set_polling_page(address page) { _polling_page = page; } 386 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } 387 static void make_polling_page_unreadable(); 388 static void make_polling_page_readable(); 389 390 // Routines used to serialize the thread state without using membars 391 static void serialize_thread_states(); 392 393 // Since we write to the serialize page from every thread, we 394 // want stores to be on unique cache lines whenever possible 395 // in order to minimize CPU cross talk. We pre-compute the 396 // amount to shift the thread* to make this offset unique to 397 // each thread. 398 static int get_serialize_page_shift_count() { 399 return SerializePageShiftCount; 400 } 401 402 static void set_serialize_page_mask(uintptr_t mask) { 403 _serialize_page_mask = mask; 404 } 405 406 static unsigned int get_serialize_page_mask() { 407 return _serialize_page_mask; 408 } 409 410 static void set_memory_serialize_page(address page); 411 412 static address get_memory_serialize_page() { 413 return (address)_mem_serialize_page; 414 } 415 416 static inline void write_memory_serialize_page(JavaThread *thread) { 417 uintptr_t page_offset = ((uintptr_t)thread >> 418 get_serialize_page_shift_count()) & 419 get_serialize_page_mask(); 420 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; 421 } 422 423 static bool is_memory_serialize_page(JavaThread *thread, address addr) { 424 if (UseMembar) return false; 425 // Previously this function calculated the exact address of this 426 // thread's serialize page, and checked if the faulting address 427 // was equal. However, some platforms mask off faulting addresses 428 // to the page size, so now we just check that the address is 429 // within the page. This makes the thread argument unnecessary, 430 // but we retain the NULL check to preserve existing behavior. 431 if (thread == NULL) return false; 432 address page = (address) _mem_serialize_page; 433 return addr >= page && addr < (page + os::vm_page_size()); 434 } 435 436 static void block_on_serialize_page_trap(); 437 438 // threads 439 440 enum ThreadType { 441 vm_thread, 442 cgc_thread, // Concurrent GC thread 443 pgc_thread, // Parallel GC thread 444 java_thread, 445 compiler_thread, 446 watcher_thread, 447 os_thread 448 }; 449 450 static bool create_thread(Thread* thread, 451 ThreadType thr_type, 452 size_t stack_size = 0); 453 static bool create_main_thread(JavaThread* thread); 454 static bool create_attached_thread(JavaThread* thread); 455 static void pd_start_thread(Thread* thread); 456 static void start_thread(Thread* thread); 457 458 static void initialize_thread(Thread* thr); 459 static void free_thread(OSThread* osthread); 460 461 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit 462 static intx current_thread_id(); 463 static int current_process_id(); 464 static int sleep(Thread* thread, jlong ms, bool interruptable); 465 // Short standalone OS sleep suitable for slow path spin loop. 466 // Ignores Thread.interrupt() (so keep it short). 467 // ms = 0, will sleep for the least amount of time allowed by the OS. 468 static void naked_short_sleep(jlong ms); 469 static void infinite_sleep(); // never returns, use with CAUTION 470 static void naked_yield () ; 471 static OSReturn set_priority(Thread* thread, ThreadPriority priority); 472 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); 473 474 static void interrupt(Thread* thread); 475 static bool is_interrupted(Thread* thread, bool clear_interrupted); 476 477 static int pd_self_suspend_thread(Thread* thread); 478 479 static ExtendedPC fetch_frame_from_context(const void* ucVoid, intptr_t** sp, intptr_t** fp); 480 static frame fetch_frame_from_context(const void* ucVoid); 481 static frame fetch_frame_from_ucontext(Thread* thread, void* ucVoid); 482 483 static ExtendedPC get_thread_pc(Thread *thread); 484 static void breakpoint(); 485 static bool start_debugging(char *buf, int buflen); 486 487 static address current_stack_pointer(); 488 static address current_stack_base(); 489 static size_t current_stack_size(); 490 491 static void verify_stack_alignment() PRODUCT_RETURN; 492 493 static bool message_box(const char* title, const char* message); 494 static char* do_you_want_to_debug(const char* message); 495 496 // run cmd in a separate process and return its exit code; or -1 on failures 497 static int fork_and_exec(char *cmd); 498 499 // Call ::exit() on all platforms but Windows 500 static void exit(int num); 501 502 // Terminate the VM, but don't exit the process 503 static void shutdown(); 504 505 // Terminate with an error. Default is to generate a core file on platforms 506 // that support such things. This calls shutdown() and then aborts. 507 static void abort(bool dump_core, void *siginfo, const void *context); 508 static void abort(bool dump_core = true); 509 510 // Die immediately, no exit hook, no abort hook, no cleanup. 511 static void die(); 512 513 // File i/o operations 514 static const int default_file_open_flags(); 515 static int open(const char *path, int oflag, int mode); 516 static FILE* open(int fd, const char* mode); 517 static int close(int fd); 518 static jlong lseek(int fd, jlong offset, int whence); 519 static char* native_path(char *path); 520 static int ftruncate(int fd, jlong length); 521 static int fsync(int fd); 522 static int available(int fd, jlong *bytes); 523 static int get_fileno(FILE* fp); 524 static void flockfile(FILE* fp); 525 static void funlockfile(FILE* fp); 526 527 static int compare_file_modified_times(const char* file1, const char* file2); 528 529 //File i/o operations 530 531 static size_t read(int fd, void *buf, unsigned int nBytes); 532 static size_t read_at(int fd, void *buf, unsigned int nBytes, jlong offset); 533 static size_t restartable_read(int fd, void *buf, unsigned int nBytes); 534 static size_t write(int fd, const void *buf, unsigned int nBytes); 535 536 // Reading directories. 537 static DIR* opendir(const char* dirname); 538 static int readdir_buf_size(const char *path); 539 static struct dirent* readdir(DIR* dirp, dirent* dbuf); 540 static int closedir(DIR* dirp); 541 542 // Dynamic library extension 543 static const char* dll_file_extension(); 544 545 static const char* get_temp_directory(); 546 static const char* get_current_directory(char *buf, size_t buflen); 547 548 // Builds a platform-specific full library path given a ld path and lib name 549 // Returns true if buffer contains full path to existing file, false otherwise 550 static bool dll_build_name(char* buffer, size_t size, 551 const char* pathname, const char* fname); 552 553 // Symbol lookup, find nearest function name; basically it implements 554 // dladdr() for all platforms. Name of the nearest function is copied 555 // to buf. Distance from its base address is optionally returned as offset. 556 // If function name is not found, buf[0] is set to '\0' and offset is 557 // set to -1 (if offset is non-NULL). 558 static bool dll_address_to_function_name(address addr, char* buf, 559 int buflen, int* offset, 560 bool demangle = true); 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 // Callback for loaded module information 584 // Input parameters: 585 // char* module_file_name, 586 // address module_base_addr, 587 // address module_top_addr, 588 // void* param 589 typedef int (*LoadedModulesCallbackFunc)(const char *, address, address, void *); 590 591 static int get_loaded_modules_info(LoadedModulesCallbackFunc callback, void *param); 592 593 // Return the handle of this process 594 static void* get_default_process_handle(); 595 596 // Check for static linked agent library 597 static bool find_builtin_agent(AgentLibrary *agent_lib, const char *syms[], 598 size_t syms_len); 599 600 // Find agent entry point 601 static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib, 602 const char *syms[], size_t syms_len); 603 604 // Write to stream 605 static int log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) ATTRIBUTE_PRINTF(3, 0); 606 607 // Get host name in buffer provided 608 static bool get_host_name(char* buf, size_t buflen); 609 610 // Print out system information; they are called by fatal error handler. 611 // Output format may be different on different platforms. 612 static void print_os_info(outputStream* st); 613 static void print_os_info_brief(outputStream* st); 614 static void print_cpu_info(outputStream* st, char* buf, size_t buflen); 615 static void pd_print_cpu_info(outputStream* st, char* buf, size_t buflen); 616 static void print_summary_info(outputStream* st, char* buf, size_t buflen); 617 static void print_memory_info(outputStream* st); 618 static void print_dll_info(outputStream* st); 619 static void print_environment_variables(outputStream* st, const char** env_list); 620 static void print_context(outputStream* st, const void* context); 621 static void print_register_info(outputStream* st, const void* context); 622 static void print_siginfo(outputStream* st, const void* siginfo); 623 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); 624 static void print_date_and_time(outputStream* st, char* buf, size_t buflen); 625 626 static void print_location(outputStream* st, intptr_t x, bool verbose = false); 627 static size_t lasterror(char *buf, size_t len); 628 static int get_last_error(); 629 630 // Replacement for strerror(). 631 // Will return the english description of the error (e.g. "File not found", as 632 // suggested in the POSIX standard. 633 // Will return "Unknown error" for an unknown errno value. 634 // Will not attempt to localize the returned string. 635 // Will always return a valid string which is a static constant. 636 // Will not change the value of errno. 637 static const char* strerror(int e); 638 639 // Will return the literalized version of the given errno (e.g. "EINVAL" 640 // for EINVAL). 641 // Will return "Unknown error" for an unknown errno value. 642 // Will always return a valid string which is a static constant. 643 // Will not change the value of errno. 644 static const char* errno_name(int e); 645 646 // Determines whether the calling process is being debugged by a user-mode debugger. 647 static bool is_debugger_attached(); 648 649 // wait for a key press if PauseAtExit is set 650 static void wait_for_keypress_at_exit(void); 651 652 // The following two functions are used by fatal error handler to trace 653 // native (C) frames. They are not part of frame.hpp/frame.cpp because 654 // frame.hpp/cpp assume thread is JavaThread, and also because different 655 // OS/compiler may have different convention or provide different API to 656 // walk C frames. 657 // 658 // We don't attempt to become a debugger, so we only follow frames if that 659 // does not require a lookup in the unwind table, which is part of the binary 660 // file but may be unsafe to read after a fatal error. So on x86, we can 661 // only walk stack if %ebp is used as frame pointer; on ia64, it's not 662 // possible to walk C stack without having the unwind table. 663 static bool is_first_C_frame(frame *fr); 664 static frame get_sender_for_C_frame(frame *fr); 665 666 // return current frame. pc() and sp() are set to NULL on failure. 667 static frame current_frame(); 668 669 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); 670 671 // returns a string to describe the exception/signal; 672 // returns NULL if exception_code is not an OS exception/signal. 673 static const char* exception_name(int exception_code, char* buf, size_t buflen); 674 675 // Returns the signal number (e.g. 11) for a given signal name (SIGSEGV). 676 static int get_signal_number(const char* signal_name); 677 678 // Returns native Java library, loads if necessary 679 static void* native_java_library(); 680 681 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler) 682 static void jvm_path(char *buf, jint buflen); 683 684 // Returns true if we are running in a headless jre. 685 static bool is_headless_jre(); 686 687 // JNI names 688 static void print_jni_name_prefix_on(outputStream* st, int args_size); 689 static void print_jni_name_suffix_on(outputStream* st, int args_size); 690 691 // Init os specific system properties values 692 static void init_system_properties_values(); 693 694 // IO operations, non-JVM_ version. 695 static int stat(const char* path, struct stat* sbuf); 696 static bool dir_is_empty(const char* path); 697 698 // IO operations on binary files 699 static int create_binary_file(const char* path, bool rewrite_existing); 700 static jlong current_file_offset(int fd); 701 static jlong seek_to_file_offset(int fd, jlong offset); 702 703 // Retrieve native stack frames. 704 // Parameter: 705 // stack: an array to storage stack pointers. 706 // frames: size of above array. 707 // toSkip: number of stack frames to skip at the beginning. 708 // Return: number of stack frames captured. 709 static int get_native_stack(address* stack, int size, int toSkip = 0); 710 711 // General allocation (must be MT-safe) 712 static void* malloc (size_t size, MEMFLAGS flags, const NativeCallStack& stack); 713 static void* malloc (size_t size, MEMFLAGS flags); 714 static void* realloc (void *memblock, size_t size, MEMFLAGS flag, const NativeCallStack& stack); 715 static void* realloc (void *memblock, size_t size, MEMFLAGS flag); 716 717 static void free (void *memblock); 718 static bool check_heap(bool force = false); // verify C heap integrity 719 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup 720 // Like strdup, but exit VM when strdup() returns NULL 721 static char* strdup_check_oom(const char*, MEMFLAGS flags = mtInternal); 722 723 #ifndef PRODUCT 724 static julong num_mallocs; // # of calls to malloc/realloc 725 static julong alloc_bytes; // # of bytes allocated 726 static julong num_frees; // # of calls to free 727 static julong free_bytes; // # of bytes freed 728 #endif 729 730 // SocketInterface (ex HPI SocketInterface ) 731 static int socket(int domain, int type, int protocol); 732 static int socket_close(int fd); 733 static int recv(int fd, char* buf, size_t nBytes, uint flags); 734 static int send(int fd, char* buf, size_t nBytes, uint flags); 735 static int raw_send(int fd, char* buf, size_t nBytes, uint flags); 736 static int connect(int fd, struct sockaddr* him, socklen_t len); 737 static struct hostent* get_host_by_name(char* name); 738 739 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) 740 static void signal_init(); 741 static void signal_init_pd(); 742 static void signal_notify(int signal_number); 743 static void* signal(int signal_number, void* handler); 744 static void signal_raise(int signal_number); 745 static int signal_wait(); 746 static int signal_lookup(); 747 static void* user_handler(); 748 static void terminate_signal_thread(); 749 static int sigexitnum_pd(); 750 751 // random number generation 752 static long random(); // return 32bit pseudorandom number 753 static void init_random(long initval); // initialize random sequence 754 755 // Structured OS Exception support 756 static void os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method, JavaCallArguments* args, Thread* thread); 757 758 // On Posix compatible OS it will simply check core dump limits while on Windows 759 // it will check if dump file can be created. Check or prepare a core dump to be 760 // taken at a later point in the same thread in os::abort(). Use the caller 761 // provided buffer as a scratch buffer. The status message which will be written 762 // into the error log either is file location or a short error message, depending 763 // on the checking result. 764 static void check_dump_limit(char* buffer, size_t bufferSize); 765 766 // Get the default path to the core file 767 // Returns the length of the string 768 static int get_core_path(char* buffer, size_t bufferSize); 769 770 // JVMTI & JVM monitoring and management support 771 // The thread_cpu_time() and current_thread_cpu_time() are only 772 // supported if is_thread_cpu_time_supported() returns true. 773 // They are not supported on Solaris T1. 774 775 // Thread CPU Time - return the fast estimate on a platform 776 // On Solaris - call gethrvtime (fast) - user time only 777 // On Linux - fast clock_gettime where available - user+sys 778 // - otherwise: very slow /proc fs - user+sys 779 // On Windows - GetThreadTimes - user+sys 780 static jlong current_thread_cpu_time(); 781 static jlong thread_cpu_time(Thread* t); 782 783 // Thread CPU Time with user_sys_cpu_time parameter. 784 // 785 // If user_sys_cpu_time is true, user+sys time is returned. 786 // Otherwise, only user time is returned 787 static jlong current_thread_cpu_time(bool user_sys_cpu_time); 788 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); 789 790 // Return a bunch of info about the timers. 791 // Note that the returned info for these two functions may be different 792 // on some platforms 793 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 794 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 795 796 static bool is_thread_cpu_time_supported(); 797 798 // System loadavg support. Returns -1 if load average cannot be obtained. 799 static int loadavg(double loadavg[], int nelem); 800 801 // Hook for os specific jvm options that we don't want to abort on seeing 802 static bool obsolete_option(const JavaVMOption *option); 803 804 // Amount beyond the callee frame size that we bang the stack. 805 static int extra_bang_size_in_bytes(); 806 807 static char** split_path(const char* path, int* n); 808 809 // Extensions 810 #include "runtime/os_ext.hpp" 811 812 public: 813 class CrashProtectionCallback : public StackObj { 814 public: 815 virtual void call() = 0; 816 }; 817 818 // Platform dependent stuff 819 #ifdef TARGET_OS_FAMILY_linux 820 # include "os_linux.hpp" 821 # include "os_posix.hpp" 822 #endif 823 #ifdef TARGET_OS_FAMILY_solaris 824 # include "os_solaris.hpp" 825 # include "os_posix.hpp" 826 #endif 827 #ifdef TARGET_OS_FAMILY_windows 828 # include "os_windows.hpp" 829 #endif 830 #ifdef TARGET_OS_FAMILY_aix 831 # include "os_aix.hpp" 832 # include "os_posix.hpp" 833 #endif 834 #ifdef TARGET_OS_FAMILY_bsd 835 # include "os_posix.hpp" 836 # include "os_bsd.hpp" 837 #endif 838 #ifdef TARGET_OS_ARCH_linux_x86 839 # include "os_linux_x86.hpp" 840 #endif 841 #ifdef TARGET_OS_ARCH_linux_sparc 842 # include "os_linux_sparc.hpp" 843 #endif 844 #ifdef TARGET_OS_ARCH_linux_zero 845 # include "os_linux_zero.hpp" 846 #endif 847 #ifdef TARGET_OS_ARCH_solaris_x86 848 # include "os_solaris_x86.hpp" 849 #endif 850 #ifdef TARGET_OS_ARCH_solaris_sparc 851 # include "os_solaris_sparc.hpp" 852 #endif 853 #ifdef TARGET_OS_ARCH_windows_x86 854 # include "os_windows_x86.hpp" 855 #endif 856 #ifdef TARGET_OS_ARCH_linux_arm 857 # include "os_linux_arm.hpp" 858 #endif 859 #ifdef TARGET_OS_ARCH_linux_ppc 860 # include "os_linux_ppc.hpp" 861 #endif 862 #ifdef TARGET_OS_ARCH_aix_ppc 863 # include "os_aix_ppc.hpp" 864 #endif 865 #ifdef TARGET_OS_ARCH_linux_aarch64 866 # include "os_linux_aarch64.hpp" 867 #endif 868 #ifdef TARGET_OS_ARCH_bsd_x86 869 # include "os_bsd_x86.hpp" 870 #endif 871 #ifdef TARGET_OS_ARCH_bsd_zero 872 # include "os_bsd_zero.hpp" 873 #endif 874 875 #ifndef OS_NATIVE_THREAD_CREATION_FAILED_MSG 876 #define OS_NATIVE_THREAD_CREATION_FAILED_MSG "unable to create native thread: possibly out of memory or process/resource limits reached" 877 #endif 878 879 public: 880 #ifndef PLATFORM_PRINT_NATIVE_STACK 881 // No platform-specific code for printing the native stack. 882 static bool platform_print_native_stack(outputStream* st, const void* context, 883 char *buf, int buf_size) { 884 return false; 885 } 886 #endif 887 888 // debugging support (mostly used by debug.cpp but also fatal error handler) 889 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address 890 891 static bool dont_yield(); // when true, JVM_Yield() is nop 892 static void print_statistics(); 893 894 // Thread priority helpers (implemented in OS-specific part) 895 static OSReturn set_native_priority(Thread* thread, int native_prio); 896 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); 897 static int java_to_os_priority[CriticalPriority + 1]; 898 // Hint to the underlying OS that a task switch would not be good. 899 // Void return because it's a hint and can fail. 900 static void hint_no_preempt(); 901 static const char* native_thread_creation_failed_msg() { 902 return OS_NATIVE_THREAD_CREATION_FAILED_MSG; 903 } 904 905 // Used at creation if requested by the diagnostic flag PauseAtStartup. 906 // Causes the VM to wait until an external stimulus has been applied 907 // (for Unix, that stimulus is a signal, for Windows, an external 908 // ResumeThread call) 909 static void pause(); 910 911 // Builds a platform dependent Agent_OnLoad_<libname> function name 912 // which is used to find statically linked in agents. 913 static char* build_agent_function_name(const char *sym, const char *cname, 914 bool is_absolute_path); 915 916 class SuspendedThreadTaskContext { 917 public: 918 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {} 919 Thread* thread() const { return _thread; } 920 void* ucontext() const { return _ucontext; } 921 private: 922 Thread* _thread; 923 void* _ucontext; 924 }; 925 926 class SuspendedThreadTask { 927 public: 928 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {} 929 virtual ~SuspendedThreadTask() {} 930 void run(); 931 bool is_done() { return _done; } 932 virtual void do_task(const SuspendedThreadTaskContext& context) = 0; 933 protected: 934 private: 935 void internal_do_task(); 936 Thread* _thread; 937 bool _done; 938 }; 939 940 #ifndef TARGET_OS_FAMILY_windows 941 // Suspend/resume support 942 // Protocol: 943 // 944 // a thread starts in SR_RUNNING 945 // 946 // SR_RUNNING can go to 947 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it 948 // SR_SUSPEND_REQUEST can go to 949 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout) 950 // * SR_SUSPENDED if the stopped thread receives the signal and switches state 951 // SR_SUSPENDED can go to 952 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume 953 // SR_WAKEUP_REQUEST can go to 954 // * SR_RUNNING when the stopped thread receives the signal 955 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again) 956 class SuspendResume { 957 public: 958 enum State { 959 SR_RUNNING, 960 SR_SUSPEND_REQUEST, 961 SR_SUSPENDED, 962 SR_WAKEUP_REQUEST 963 }; 964 965 private: 966 volatile State _state; 967 968 private: 969 /* try to switch state from state "from" to state "to" 970 * returns the state set after the method is complete 971 */ 972 State switch_state(State from, State to); 973 974 public: 975 SuspendResume() : _state(SR_RUNNING) { } 976 977 State state() const { return _state; } 978 979 State request_suspend() { 980 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST); 981 } 982 983 State cancel_suspend() { 984 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING); 985 } 986 987 State suspended() { 988 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED); 989 } 990 991 State request_wakeup() { 992 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST); 993 } 994 995 State running() { 996 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING); 997 } 998 999 bool is_running() const { 1000 return _state == SR_RUNNING; 1001 } 1002 1003 bool is_suspend_request() const { 1004 return _state == SR_SUSPEND_REQUEST; 1005 } 1006 1007 bool is_suspended() const { 1008 return _state == SR_SUSPENDED; 1009 } 1010 }; 1011 #endif 1012 1013 1014 protected: 1015 static long _rand_seed; // seed for random number generator 1016 static int _processor_count; // number of processors 1017 1018 static char* format_boot_path(const char* format_string, 1019 const char* home, 1020 int home_len, 1021 char fileSep, 1022 char pathSep); 1023 static bool set_boot_path(char fileSep, char pathSep); 1024 1025 }; 1026 1027 // Note that "PAUSE" is almost always used with synchronization 1028 // so arguably we should provide Atomic::SpinPause() instead 1029 // of the global SpinPause() with C linkage. 1030 // It'd also be eligible for inlining on many platforms. 1031 1032 extern "C" int SpinPause(); 1033 1034 #endif // SHARE_VM_RUNTIME_OS_HPP