1 /* 2 * Copyright (c) 1997, 2019, 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(); 155 156 LINUX_ONLY(static void pd_init_container_support();) 157 158 public: 159 static void init(void); // Called before command line parsing 160 161 static void init_container_support() { // Called during command line parsing. 162 LINUX_ONLY(pd_init_container_support();) 163 } 164 165 static void init_before_ergo(void); // Called after command line parsing 166 // before VM ergonomics processing. 167 static jint init_2(void); // Called after command line parsing 168 // and VM ergonomics processing 169 static void init_globals(void) { // Called from init_globals() in init.cpp 170 init_globals_ext(); 171 } 172 173 // File names are case-insensitive on windows only 174 // Override me as needed 175 static int file_name_strcmp(const char* s1, const char* s2); 176 177 // get/unset environment variable 178 static bool getenv(const char* name, char* buffer, int len); 179 static bool unsetenv(const char* name); 180 181 static bool have_special_privileges(); 182 183 static jlong javaTimeMillis(); 184 static jlong javaTimeNanos(); 185 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); 186 static void run_periodic_checks(); 187 188 189 // Returns the elapsed time in seconds since the vm started. 190 static double elapsedTime(); 191 192 // Returns real time in seconds since an arbitrary point 193 // in the past. 194 static bool getTimesSecs(double* process_real_time, 195 double* process_user_time, 196 double* process_system_time); 197 198 // Interface to the performance counter 199 static jlong elapsed_counter(); 200 static jlong elapsed_frequency(); 201 202 // The "virtual time" of a thread is the amount of time a thread has 203 // actually run. The first function indicates whether the OS supports 204 // this functionality for the current thread, and if so: 205 // * the second enables vtime tracking (if that is required). 206 // * the third tells whether vtime is enabled. 207 // * the fourth returns the elapsed virtual time for the current 208 // thread. 209 static bool supports_vtime(); 210 static bool enable_vtime(); 211 static bool vtime_enabled(); 212 static double elapsedVTime(); 213 214 // Return current local time in a string (YYYY-MM-DD HH:MM:SS). 215 // It is MT safe, but not async-safe, as reading time zone 216 // information may require a lock on some platforms. 217 static char* local_time_string(char *buf, size_t buflen); 218 static struct tm* localtime_pd (const time_t* clock, struct tm* res); 219 // Fill in buffer with current local time as an ISO-8601 string. 220 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. 221 // Returns buffer, or NULL if it failed. 222 static char* iso8601_time(char* buffer, size_t buffer_length); 223 224 // Interface for detecting multiprocessor system 225 static inline bool is_MP() { 226 // During bootstrap if _processor_count is not yet initialized 227 // we claim to be MP as that is safest. If any platform has a 228 // stub generator that might be triggered in this phase and for 229 // which being declared MP when in fact not, is a problem - then 230 // the bootstrap routine for the stub generator needs to check 231 // the processor count directly and leave the bootstrap routine 232 // in place until called after initialization has ocurred. 233 return (_processor_count != 1) || AssumeMP; 234 } 235 static julong available_memory(); 236 static julong physical_memory(); 237 static bool has_allocatable_memory_limit(julong* limit); 238 static bool is_server_class_machine(); 239 240 // number of CPUs 241 static int processor_count() { 242 return _processor_count; 243 } 244 static void set_processor_count(int count) { _processor_count = count; } 245 246 // Returns the number of CPUs this process is currently allowed to run on. 247 // Note that on some OSes this can change dynamically. 248 static int active_processor_count(); 249 250 // At startup the number of active CPUs this process is allowed to run on. 251 // This value does not change dynamically. May be different from active_processor_count(). 252 static int initial_active_processor_count() { 253 assert(_initial_active_processor_count > 0, "Initial active processor count not set yet."); 254 return _initial_active_processor_count; 255 } 256 257 // Bind processes to processors. 258 // This is a two step procedure: 259 // first you generate a distribution of processes to processors, 260 // then you bind processes according to that distribution. 261 // Compute a distribution for number of processes to processors. 262 // Stores the processor id's into the distribution array argument. 263 // Returns true if it worked, false if it didn't. 264 static bool distribute_processes(uint length, uint* distribution); 265 // Binds the current process to a processor. 266 // Returns true if it worked, false if it didn't. 267 static bool bind_to_processor(uint processor_id); 268 269 // Give a name to the current thread. 270 static void set_native_thread_name(const char *name); 271 272 // Interface for stack banging (predetect possible stack overflow for 273 // exception processing) There are guard pages, and above that shadow 274 // pages for stack overflow checking. 275 static bool uses_stack_guard_pages(); 276 static bool allocate_stack_guard_pages(); 277 static void bang_stack_shadow_pages(); 278 static bool stack_shadow_pages_available(Thread *thread, methodHandle method); 279 280 // OS interface to Virtual Memory 281 282 // Return the default page size. 283 static int vm_page_size(); 284 285 // Returns the page size to use for a region of memory. 286 // region_size / min_pages will always be greater than or equal to the 287 // returned value. The returned value will divide region_size. 288 static size_t page_size_for_region_aligned(size_t region_size, size_t min_pages); 289 290 // Returns the page size to use for a region of memory. 291 // region_size / min_pages will always be greater than or equal to the 292 // returned value. The returned value might not divide region_size. 293 static size_t page_size_for_region_unaligned(size_t region_size, size_t min_pages); 294 295 // Return the largest page size that can be used 296 static size_t max_page_size() { 297 // The _page_sizes array is sorted in descending order. 298 return _page_sizes[0]; 299 } 300 301 // Methods for tracing page sizes returned by the above method; enabled by 302 // TracePageSizes. The region_{min,max}_size parameters should be the values 303 // passed to page_size_for_region() and page_size should be the result of that 304 // call. The (optional) base and size parameters should come from the 305 // ReservedSpace base() and size() methods. 306 static void trace_page_sizes(const char* str, const size_t* page_sizes, 307 int count) PRODUCT_RETURN; 308 static void trace_page_sizes(const char* str, const size_t region_min_size, 309 const size_t region_max_size, 310 const size_t page_size, 311 const char* base = NULL, 312 const size_t size = 0) PRODUCT_RETURN; 313 314 static int vm_allocation_granularity(); 315 static char* reserve_memory(size_t bytes, char* addr = 0, 316 size_t alignment_hint = 0); 317 static char* reserve_memory(size_t bytes, char* addr, 318 size_t alignment_hint, MEMFLAGS flags); 319 static char* reserve_memory_aligned(size_t size, size_t alignment); 320 static char* attempt_reserve_memory_at(size_t bytes, char* addr); 321 static void split_reserved_memory(char *base, size_t size, 322 size_t split, bool realloc); 323 static bool commit_memory(char* addr, size_t bytes, bool executable); 324 static bool commit_memory(char* addr, size_t size, size_t alignment_hint, 325 bool executable); 326 // Same as commit_memory() that either succeeds or calls 327 // vm_exit_out_of_memory() with the specified mesg. 328 static void commit_memory_or_exit(char* addr, size_t bytes, 329 bool executable, const char* mesg); 330 static void commit_memory_or_exit(char* addr, size_t size, 331 size_t alignment_hint, 332 bool executable, const char* mesg); 333 static bool uncommit_memory(char* addr, size_t bytes); 334 static bool release_memory(char* addr, size_t bytes); 335 336 // Touch memory pages that cover the memory range from start to end (exclusive) 337 // to make the OS back the memory range with actual memory. 338 // Current implementation may not touch the last page if unaligned addresses 339 // are passed. 340 static void pretouch_memory(char* start, char* end); 341 342 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; 343 static bool protect_memory(char* addr, size_t bytes, ProtType prot, 344 bool is_committed = true); 345 346 static bool guard_memory(char* addr, size_t bytes); 347 static bool unguard_memory(char* addr, size_t bytes); 348 static bool create_stack_guard_pages(char* addr, size_t bytes); 349 static bool pd_create_stack_guard_pages(char* addr, size_t bytes); 350 static bool remove_stack_guard_pages(char* addr, size_t bytes); 351 352 static char* map_memory(int fd, const char* file_name, size_t file_offset, 353 char *addr, size_t bytes, bool read_only = false, 354 bool allow_exec = false); 355 static char* remap_memory(int fd, const char* file_name, size_t file_offset, 356 char *addr, size_t bytes, bool read_only, 357 bool allow_exec); 358 static bool unmap_memory(char *addr, size_t bytes); 359 static void free_memory(char *addr, size_t bytes, size_t alignment_hint); 360 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); 361 362 // NUMA-specific interface 363 static bool numa_has_static_binding(); 364 static bool numa_has_group_homing(); 365 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); 366 static void numa_make_global(char *addr, size_t bytes); 367 static size_t numa_get_groups_num(); 368 static size_t numa_get_leaf_groups(int *ids, size_t size); 369 static bool numa_topology_changed(); 370 static int numa_get_group_id(); 371 372 // Page manipulation 373 struct page_info { 374 size_t size; 375 int lgrp_id; 376 }; 377 static bool get_page_info(char *start, page_info* info); 378 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); 379 380 static char* non_memory_address_word(); 381 // reserve, commit and pin the entire memory region 382 static char* reserve_memory_special(size_t size, size_t alignment, 383 char* addr, bool executable); 384 static bool release_memory_special(char* addr, size_t bytes); 385 static void large_page_init(); 386 static size_t large_page_size(); 387 static bool can_commit_large_page_memory(); 388 static bool can_execute_large_page_memory(); 389 390 // OS interface to polling page 391 static address get_polling_page() { return _polling_page; } 392 static void set_polling_page(address page) { _polling_page = page; } 393 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } 394 static void make_polling_page_unreadable(); 395 static void make_polling_page_readable(); 396 397 // Routines used to serialize the thread state without using membars 398 static void serialize_thread_states(); 399 400 // Since we write to the serialize page from every thread, we 401 // want stores to be on unique cache lines whenever possible 402 // in order to minimize CPU cross talk. We pre-compute the 403 // amount to shift the thread* to make this offset unique to 404 // each thread. 405 static int get_serialize_page_shift_count() { 406 return SerializePageShiftCount; 407 } 408 409 static void set_serialize_page_mask(uintptr_t mask) { 410 _serialize_page_mask = mask; 411 } 412 413 static unsigned int get_serialize_page_mask() { 414 return _serialize_page_mask; 415 } 416 417 static void set_memory_serialize_page(address page); 418 419 static address get_memory_serialize_page() { 420 return (address)_mem_serialize_page; 421 } 422 423 static inline void write_memory_serialize_page(JavaThread *thread) { 424 uintptr_t page_offset = ((uintptr_t)thread >> 425 get_serialize_page_shift_count()) & 426 get_serialize_page_mask(); 427 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; 428 } 429 430 static bool is_memory_serialize_page(JavaThread *thread, address addr) { 431 if (UseMembar) return false; 432 // Previously this function calculated the exact address of this 433 // thread's serialize page, and checked if the faulting address 434 // was equal. However, some platforms mask off faulting addresses 435 // to the page size, so now we just check that the address is 436 // within the page. This makes the thread argument unnecessary, 437 // but we retain the NULL check to preserve existing behaviour. 438 if (thread == NULL) return false; 439 address page = (address) _mem_serialize_page; 440 return addr >= page && addr < (page + os::vm_page_size()); 441 } 442 443 static void block_on_serialize_page_trap(); 444 445 // threads 446 447 enum ThreadType { 448 vm_thread, 449 cgc_thread, // Concurrent GC thread 450 pgc_thread, // Parallel GC thread 451 java_thread, 452 compiler_thread, 453 watcher_thread, 454 os_thread 455 }; 456 457 static bool create_thread(Thread* thread, 458 ThreadType thr_type, 459 size_t stack_size = 0); 460 461 // The "main thread", also known as "starting thread", is the thread 462 // that loads/creates the JVM via JNI_CreateJavaVM. 463 static bool create_main_thread(JavaThread* thread); 464 465 // The primordial thread is the initial process thread. The java 466 // launcher never uses the primordial thread as the main thread, but 467 // applications that host the JVM directly may do so. Some platforms 468 // need special-case handling of the primordial thread if it attaches 469 // to the VM. 470 static bool is_primordial_thread(void) 471 #if defined(_WINDOWS) || defined(BSD) 472 // No way to identify the primordial thread. 473 { return false; } 474 #else 475 ; 476 #endif 477 478 static bool create_attached_thread(JavaThread* thread); 479 static void pd_start_thread(Thread* thread); 480 static void start_thread(Thread* thread); 481 482 static void initialize_thread(Thread* thr); 483 static void free_thread(OSThread* osthread); 484 485 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit 486 static intx current_thread_id(); 487 static int current_process_id(); 488 static int sleep(Thread* thread, jlong ms, bool interruptable); 489 // Short standalone OS sleep suitable for slow path spin loop. 490 // Ignores Thread.interrupt() (so keep it short). 491 // ms = 0, will sleep for the least amount of time allowed by the OS. 492 static void naked_short_sleep(jlong ms); 493 static void infinite_sleep(); // never returns, use with CAUTION 494 static void yield(); // Yields to all threads with same priority 495 enum YieldResult { 496 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran 497 YIELD_NONEREADY = 0, // No other runnable/ready threads. 498 // platform-specific yield return immediately 499 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY 500 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong" 501 // yield that can be used in lieu of blocking. 502 } ; 503 static YieldResult NakedYield () ; 504 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority 505 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing 506 static OSReturn set_priority(Thread* thread, ThreadPriority priority); 507 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); 508 509 static void interrupt(Thread* thread); 510 static bool is_interrupted(Thread* thread, bool clear_interrupted); 511 512 static int pd_self_suspend_thread(Thread* thread); 513 514 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); 515 static frame fetch_frame_from_context(void* ucVoid); 516 517 static ExtendedPC get_thread_pc(Thread *thread); 518 static void breakpoint(); 519 520 static address current_stack_pointer(); 521 static address current_stack_base(); 522 static size_t current_stack_size(); 523 524 static void verify_stack_alignment() PRODUCT_RETURN; 525 526 static int message_box(const char* title, const char* message); 527 static char* do_you_want_to_debug(const char* message); 528 529 // run cmd in a separate process and return its exit code; or -1 on failures 530 static int fork_and_exec(char *cmd); 531 532 // os::exit() is merged with vm_exit() 533 // static void exit(int num); 534 535 // Terminate the VM, but don't exit the process 536 static void shutdown(); 537 538 // Terminate with an error. Default is to generate a core file on platforms 539 // that support such things. This calls shutdown() and then aborts. 540 static void abort(bool dump_core = true); 541 542 // Die immediately, no exit hook, no abort hook, no cleanup. 543 static void die(); 544 545 // File i/o operations 546 static const int default_file_open_flags(); 547 static int open(const char *path, int oflag, int mode); 548 static FILE* open(int fd, const char* mode); 549 static int close(int fd); 550 static jlong lseek(int fd, jlong offset, int whence); 551 static char* native_path(char *path); 552 static int ftruncate(int fd, jlong length); 553 static int fsync(int fd); 554 static int available(int fd, jlong *bytes); 555 556 //File i/o operations 557 558 static size_t read(int fd, void *buf, unsigned int nBytes); 559 static size_t read_at(int fd, void *buf, unsigned int nBytes, jlong offset); 560 static size_t restartable_read(int fd, void *buf, unsigned int nBytes); 561 static size_t write(int fd, const void *buf, unsigned int nBytes); 562 563 // Reading directories. 564 static DIR* opendir(const char* dirname); 565 static int readdir_buf_size(const char *path); 566 static struct dirent* readdir(DIR* dirp, dirent* dbuf); 567 static int closedir(DIR* dirp); 568 569 // Dynamic library extension 570 static const char* dll_file_extension(); 571 572 static const char* get_temp_directory(); 573 static const char* get_current_directory(char *buf, size_t buflen); 574 575 // Builds a platform-specific full library path given a ld path and lib name 576 // Returns true if buffer contains full path to existing file, false otherwise 577 static bool dll_build_name(char* buffer, size_t size, 578 const char* pathname, const char* fname); 579 580 // Symbol lookup, find nearest function name; basically it implements 581 // dladdr() for all platforms. Name of the nearest function is copied 582 // to buf. Distance from its base address is optionally returned as offset. 583 // If function name is not found, buf[0] is set to '\0' and offset is 584 // set to -1 (if offset is non-NULL). 585 static bool dll_address_to_function_name(address addr, char* buf, 586 int buflen, int* offset); 587 588 // Locate DLL/DSO. On success, full path of the library is copied to 589 // buf, and offset is optionally set to be the distance between addr 590 // and the library's base address. On failure, buf[0] is set to '\0' 591 // and offset is set to -1 (if offset is non-NULL). 592 static bool dll_address_to_library_name(address addr, char* buf, 593 int buflen, int* offset); 594 595 // Find out whether the pc is in the static code for jvm.dll/libjvm.so. 596 static bool address_is_in_vm(address addr); 597 598 // Loads .dll/.so and 599 // in case of error it checks if .dll/.so was built for the 600 // same architecture as Hotspot is running on 601 static void* dll_load(const char *name, char *ebuf, int ebuflen); 602 603 // lookup symbol in a shared library 604 static void* dll_lookup(void* handle, const char* name); 605 606 // Unload library 607 static void dll_unload(void *lib); 608 609 // Callback for loaded module information 610 // Input parameters: 611 // char* module_file_name, 612 // address module_base_addr, 613 // address module_top_addr, 614 // void* param 615 typedef int (*LoadedModulesCallbackFunc)(const char *, address, address, void *); 616 617 static int get_loaded_modules_info(LoadedModulesCallbackFunc callback, void *param); 618 619 // Return the handle of this process 620 static void* get_default_process_handle(); 621 622 // Check for static linked agent library 623 static bool find_builtin_agent(AgentLibrary *agent_lib, const char *syms[], 624 size_t syms_len); 625 626 // Find agent entry point 627 static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib, 628 const char *syms[], size_t syms_len); 629 630 // Print out system information; they are called by fatal error handler. 631 // Output format may be different on different platforms. 632 static void print_os_info(outputStream* st); 633 static void print_os_info_brief(outputStream* st); 634 static void print_cpu_info(outputStream* st); 635 static void pd_print_cpu_info(outputStream* st); 636 static void print_memory_info(outputStream* st); 637 static void print_dll_info(outputStream* st); 638 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len); 639 static void print_context(outputStream* st, void* context); 640 static void print_register_info(outputStream* st, void* context); 641 static void print_siginfo(outputStream* st, void* siginfo); 642 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); 643 static void print_date_and_time(outputStream* st, char* buf, size_t buflen); 644 645 static void print_location(outputStream* st, intptr_t x, bool verbose = false); 646 static size_t lasterror(char *buf, size_t len); 647 static int get_last_error(); 648 649 // Determines whether the calling process is being debugged by a user-mode debugger. 650 static bool is_debugger_attached(); 651 652 // wait for a key press if PauseAtExit is set 653 static void wait_for_keypress_at_exit(void); 654 655 // The following two functions are used by fatal error handler to trace 656 // native (C) frames. They are not part of frame.hpp/frame.cpp because 657 // frame.hpp/cpp assume thread is JavaThread, and also because different 658 // OS/compiler may have different convention or provide different API to 659 // walk C frames. 660 // 661 // We don't attempt to become a debugger, so we only follow frames if that 662 // does not require a lookup in the unwind table, which is part of the binary 663 // file but may be unsafe to read after a fatal error. So on x86, we can 664 // only walk stack if %ebp is used as frame pointer; on ia64, it's not 665 // possible to walk C stack without having the unwind table. 666 static bool is_first_C_frame(frame *fr); 667 static frame get_sender_for_C_frame(frame *fr); 668 669 // return current frame. pc() and sp() are set to NULL on failure. 670 static frame current_frame(); 671 672 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); 673 674 // returns a string to describe the exception/signal; 675 // returns NULL if exception_code is not an OS exception/signal. 676 static const char* exception_name(int exception_code, char* buf, size_t buflen); 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 // File conventions 692 static const char* file_separator(); 693 static const char* line_separator(); 694 static const char* path_separator(); 695 696 // Init os specific system properties values 697 static void init_system_properties_values(); 698 699 // IO operations, non-JVM_ version. 700 static int stat(const char* path, struct stat* sbuf); 701 static bool dir_is_empty(const char* path); 702 703 // IO operations on binary files 704 static int create_binary_file(const char* path, bool rewrite_existing); 705 static jlong current_file_offset(int fd); 706 static jlong seek_to_file_offset(int fd, jlong offset); 707 708 // Thread Local Storage 709 static int allocate_thread_local_storage(); 710 static void thread_local_storage_at_put(int index, void* value); 711 static void* thread_local_storage_at(int index); 712 static void free_thread_local_storage(int index); 713 714 // Retrieve native stack frames. 715 // Parameter: 716 // stack: an array to storage stack pointers. 717 // frames: size of above array. 718 // toSkip: number of stack frames to skip at the beginning. 719 // Return: number of stack frames captured. 720 static int get_native_stack(address* stack, int size, int toSkip = 0); 721 722 // General allocation (must be MT-safe) 723 static void* malloc (size_t size, MEMFLAGS flags, const NativeCallStack& stack); 724 static void* malloc (size_t size, MEMFLAGS flags); 725 static void* realloc (void *memblock, size_t size, MEMFLAGS flag, const NativeCallStack& stack); 726 static void* realloc (void *memblock, size_t size, MEMFLAGS flag); 727 728 static void free (void *memblock, MEMFLAGS flags = mtNone); 729 static bool check_heap(bool force = false); // verify C heap integrity 730 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup 731 732 #ifndef PRODUCT 733 static julong num_mallocs; // # of calls to malloc/realloc 734 static julong alloc_bytes; // # of bytes allocated 735 static julong num_frees; // # of calls to free 736 static julong free_bytes; // # of bytes freed 737 #endif 738 739 // SocketInterface (ex HPI SocketInterface ) 740 static int socket(int domain, int type, int protocol); 741 static int socket_close(int fd); 742 static int socket_shutdown(int fd, int howto); 743 static int recv(int fd, char* buf, size_t nBytes, uint flags); 744 static int send(int fd, char* buf, size_t nBytes, uint flags); 745 static int raw_send(int fd, char* buf, size_t nBytes, uint flags); 746 static int timeout(int fd, long timeout); 747 static int listen(int fd, int count); 748 static int connect(int fd, struct sockaddr* him, socklen_t len); 749 static int bind(int fd, struct sockaddr* him, socklen_t len); 750 static int accept(int fd, struct sockaddr* him, socklen_t* len); 751 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags, 752 struct sockaddr* from, socklen_t* fromlen); 753 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len); 754 static int sendto(int fd, char* buf, size_t len, uint flags, 755 struct sockaddr* to, socklen_t tolen); 756 static int socket_available(int fd, jint* pbytes); 757 758 static int get_sock_opt(int fd, int level, int optname, 759 char* optval, socklen_t* optlen); 760 static int set_sock_opt(int fd, int level, int optname, 761 const char* optval, socklen_t optlen); 762 static int get_host_name(char* name, int namelen); 763 764 static struct hostent* get_host_by_name(char* name); 765 766 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) 767 static void signal_init(); 768 static void signal_init_pd(); 769 static void signal_notify(int signal_number); 770 static void* signal(int signal_number, void* handler); 771 static void signal_raise(int signal_number); 772 static int signal_wait(); 773 static int signal_lookup(); 774 static void* user_handler(); 775 static void terminate_signal_thread(); 776 static int sigexitnum_pd(); 777 778 // random number generation 779 static long random(); // return 32bit pseudorandom number 780 static void init_random(long initval); // initialize random sequence 781 782 // Structured OS Exception support 783 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); 784 785 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits 786 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize); 787 788 // Get the default path to the core file 789 // Returns the length of the string 790 static int get_core_path(char* buffer, size_t bufferSize); 791 792 // JVMTI & JVM monitoring and management support 793 // The thread_cpu_time() and current_thread_cpu_time() are only 794 // supported if is_thread_cpu_time_supported() returns true. 795 // They are not supported on Solaris T1. 796 797 // Thread CPU Time - return the fast estimate on a platform 798 // On Solaris - call gethrvtime (fast) - user time only 799 // On Linux - fast clock_gettime where available - user+sys 800 // - otherwise: very slow /proc fs - user+sys 801 // On Windows - GetThreadTimes - user+sys 802 static jlong current_thread_cpu_time(); 803 static jlong thread_cpu_time(Thread* t); 804 805 // Thread CPU Time with user_sys_cpu_time parameter. 806 // 807 // If user_sys_cpu_time is true, user+sys time is returned. 808 // Otherwise, only user time is returned 809 static jlong current_thread_cpu_time(bool user_sys_cpu_time); 810 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); 811 812 // Return a bunch of info about the timers. 813 // Note that the returned info for these two functions may be different 814 // on some platforms 815 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 816 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 817 818 static bool is_thread_cpu_time_supported(); 819 820 // System loadavg support. Returns -1 if load average cannot be obtained. 821 static int loadavg(double loadavg[], int nelem); 822 823 // Hook for os specific jvm options that we don't want to abort on seeing 824 static bool obsolete_option(const JavaVMOption *option); 825 826 // Extensions 827 #include "runtime/os_ext.hpp" 828 829 public: 830 class CrashProtectionCallback : public StackObj { 831 public: 832 virtual void call() = 0; 833 }; 834 835 // Platform dependent stuff 836 #ifdef TARGET_OS_FAMILY_linux 837 # include "os_linux.hpp" 838 # include "os_posix.hpp" 839 #endif 840 #ifdef TARGET_OS_FAMILY_solaris 841 # include "os_solaris.hpp" 842 # include "os_posix.hpp" 843 #endif 844 #ifdef TARGET_OS_FAMILY_windows 845 # include "os_windows.hpp" 846 #endif 847 #ifdef TARGET_OS_FAMILY_aix 848 # include "os_aix.hpp" 849 # include "os_posix.hpp" 850 #endif 851 #ifdef TARGET_OS_FAMILY_bsd 852 # include "os_posix.hpp" 853 # include "os_bsd.hpp" 854 #endif 855 #ifdef TARGET_OS_ARCH_linux_x86 856 # include "os_linux_x86.hpp" 857 #endif 858 #ifdef TARGET_OS_ARCH_linux_sparc 859 # include "os_linux_sparc.hpp" 860 #endif 861 #ifdef TARGET_OS_ARCH_linux_zero 862 # include "os_linux_zero.hpp" 863 #endif 864 #ifdef TARGET_OS_ARCH_solaris_x86 865 # include "os_solaris_x86.hpp" 866 #endif 867 #ifdef TARGET_OS_ARCH_solaris_sparc 868 # include "os_solaris_sparc.hpp" 869 #endif 870 #ifdef TARGET_OS_ARCH_windows_x86 871 # include "os_windows_x86.hpp" 872 #endif 873 #ifdef TARGET_OS_ARCH_linux_arm 874 # include "os_linux_arm.hpp" 875 #endif 876 #ifdef TARGET_OS_ARCH_linux_ppc 877 # include "os_linux_ppc.hpp" 878 #endif 879 #ifdef TARGET_OS_ARCH_aix_ppc 880 # include "os_aix_ppc.hpp" 881 #endif 882 #ifdef TARGET_OS_ARCH_bsd_x86 883 # include "os_bsd_x86.hpp" 884 #endif 885 #ifdef TARGET_OS_ARCH_bsd_zero 886 # include "os_bsd_zero.hpp" 887 #endif 888 889 public: 890 #ifndef PLATFORM_PRINT_NATIVE_STACK 891 // No platform-specific code for printing the native stack. 892 static bool platform_print_native_stack(outputStream* st, void* context, 893 char *buf, int buf_size) { 894 return false; 895 } 896 #endif 897 898 // debugging support (mostly used by debug.cpp but also fatal error handler) 899 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address 900 901 static bool dont_yield(); // when true, JVM_Yield() is nop 902 static void print_statistics(); 903 904 // Thread priority helpers (implemented in OS-specific part) 905 static OSReturn set_native_priority(Thread* thread, int native_prio); 906 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); 907 static int java_to_os_priority[CriticalPriority + 1]; 908 // Hint to the underlying OS that a task switch would not be good. 909 // Void return because it's a hint and can fail. 910 static void hint_no_preempt(); 911 912 // Used at creation if requested by the diagnostic flag PauseAtStartup. 913 // Causes the VM to wait until an external stimulus has been applied 914 // (for Unix, that stimulus is a signal, for Windows, an external 915 // ResumeThread call) 916 static void pause(); 917 918 // Builds a platform dependent Agent_OnLoad_<libname> function name 919 // which is used to find statically linked in agents. 920 static char* build_agent_function_name(const char *sym, const char *cname, 921 bool is_absolute_path); 922 923 class SuspendedThreadTaskContext { 924 public: 925 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {} 926 Thread* thread() const { return _thread; } 927 void* ucontext() const { return _ucontext; } 928 private: 929 Thread* _thread; 930 void* _ucontext; 931 }; 932 933 class SuspendedThreadTask { 934 public: 935 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {} 936 virtual ~SuspendedThreadTask() {} 937 void run(); 938 bool is_done() { return _done; } 939 virtual void do_task(const SuspendedThreadTaskContext& context) = 0; 940 protected: 941 private: 942 void internal_do_task(); 943 Thread* _thread; 944 bool _done; 945 }; 946 947 #ifndef TARGET_OS_FAMILY_windows 948 // Suspend/resume support 949 // Protocol: 950 // 951 // a thread starts in SR_RUNNING 952 // 953 // SR_RUNNING can go to 954 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it 955 // SR_SUSPEND_REQUEST can go to 956 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout) 957 // * SR_SUSPENDED if the stopped thread receives the signal and switches state 958 // SR_SUSPENDED can go to 959 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume 960 // SR_WAKEUP_REQUEST can go to 961 // * SR_RUNNING when the stopped thread receives the signal 962 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again) 963 class SuspendResume { 964 public: 965 enum State { 966 SR_RUNNING, 967 SR_SUSPEND_REQUEST, 968 SR_SUSPENDED, 969 SR_WAKEUP_REQUEST 970 }; 971 972 private: 973 volatile State _state; 974 975 private: 976 /* try to switch state from state "from" to state "to" 977 * returns the state set after the method is complete 978 */ 979 State switch_state(State from, State to); 980 981 public: 982 SuspendResume() : _state(SR_RUNNING) { } 983 984 State state() const { return _state; } 985 986 State request_suspend() { 987 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST); 988 } 989 990 State cancel_suspend() { 991 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING); 992 } 993 994 State suspended() { 995 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED); 996 } 997 998 State request_wakeup() { 999 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST); 1000 } 1001 1002 State running() { 1003 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING); 1004 } 1005 1006 bool is_running() const { 1007 return _state == SR_RUNNING; 1008 } 1009 1010 bool is_suspend_request() const { 1011 return _state == SR_SUSPEND_REQUEST; 1012 } 1013 1014 bool is_suspended() const { 1015 return _state == SR_SUSPENDED; 1016 } 1017 }; 1018 #endif 1019 1020 1021 protected: 1022 static long _rand_seed; // seed for random number generator 1023 static int _processor_count; // number of processors 1024 static int _initial_active_processor_count; // number of active processors during initialization. 1025 1026 static char* format_boot_path(const char* format_string, 1027 const char* home, 1028 int home_len, 1029 char fileSep, 1030 char pathSep); 1031 static bool set_boot_path(char fileSep, char pathSep); 1032 static char** split_path(const char* path, int* n); 1033 1034 }; 1035 1036 // Note that "PAUSE" is almost always used with synchronization 1037 // so arguably we should provide Atomic::SpinPause() instead 1038 // of the global SpinPause() with C linkage. 1039 // It'd also be eligible for inlining on many platforms. 1040 1041 extern "C" int SpinPause(); 1042 1043 #endif // SHARE_VM_RUNTIME_OS_HPP