1 /* 2 * Copyright (c) 1997, 2010, 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 #ifdef _WIN64 26 // Must be at least Windows 2000 or XP to use VectoredExceptions 27 #define _WIN32_WINNT 0x500 28 #endif 29 30 // do not include precompiled header file 31 # include "incls/_os_windows.cpp.incl" 32 33 #ifdef _DEBUG 34 #include <crtdbg.h> 35 #endif 36 37 38 #include <windows.h> 39 #include <sys/types.h> 40 #include <sys/stat.h> 41 #include <sys/timeb.h> 42 #include <objidl.h> 43 #include <shlobj.h> 44 45 #include <malloc.h> 46 #include <signal.h> 47 #include <direct.h> 48 #include <errno.h> 49 #include <fcntl.h> 50 #include <io.h> 51 #include <process.h> // For _beginthreadex(), _endthreadex() 52 #include <imagehlp.h> // For os::dll_address_to_function_name 53 54 /* for enumerating dll libraries */ 55 #include <tlhelp32.h> 56 #include <vdmdbg.h> 57 58 // for timer info max values which include all bits 59 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 60 61 // For DLL loading/load error detection 62 // Values of PE COFF 63 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c 64 #define IMAGE_FILE_SIGNATURE_LENGTH 4 65 66 static HANDLE main_process; 67 static HANDLE main_thread; 68 static int main_thread_id; 69 70 static FILETIME process_creation_time; 71 static FILETIME process_exit_time; 72 static FILETIME process_user_time; 73 static FILETIME process_kernel_time; 74 75 #ifdef _WIN64 76 PVOID topLevelVectoredExceptionHandler = NULL; 77 #endif 78 79 #ifdef _M_IA64 80 #define __CPU__ ia64 81 #elif _M_AMD64 82 #define __CPU__ amd64 83 #else 84 #define __CPU__ i486 85 #endif 86 87 // save DLL module handle, used by GetModuleFileName 88 89 HINSTANCE vm_lib_handle; 90 static int getLastErrorString(char *buf, size_t len); 91 92 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { 93 switch (reason) { 94 case DLL_PROCESS_ATTACH: 95 vm_lib_handle = hinst; 96 if(ForceTimeHighResolution) 97 timeBeginPeriod(1L); 98 break; 99 case DLL_PROCESS_DETACH: 100 if(ForceTimeHighResolution) 101 timeEndPeriod(1L); 102 #ifdef _WIN64 103 if (topLevelVectoredExceptionHandler != NULL) { 104 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler); 105 topLevelVectoredExceptionHandler = NULL; 106 } 107 #endif 108 break; 109 default: 110 break; 111 } 112 return true; 113 } 114 115 static inline double fileTimeAsDouble(FILETIME* time) { 116 const double high = (double) ((unsigned int) ~0); 117 const double split = 10000000.0; 118 double result = (time->dwLowDateTime / split) + 119 time->dwHighDateTime * (high/split); 120 return result; 121 } 122 123 // Implementation of os 124 125 bool os::getenv(const char* name, char* buffer, int len) { 126 int result = GetEnvironmentVariable(name, buffer, len); 127 return result > 0 && result < len; 128 } 129 130 131 // No setuid programs under Windows. 132 bool os::have_special_privileges() { 133 return false; 134 } 135 136 137 // This method is a periodic task to check for misbehaving JNI applications 138 // under CheckJNI, we can add any periodic checks here. 139 // For Windows at the moment does nothing 140 void os::run_periodic_checks() { 141 return; 142 } 143 144 #ifndef _WIN64 145 // previous UnhandledExceptionFilter, if there is one 146 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL; 147 148 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 149 #endif 150 void os::init_system_properties_values() { 151 /* sysclasspath, java_home, dll_dir */ 152 { 153 char *home_path; 154 char *dll_path; 155 char *pslash; 156 char *bin = "\\bin"; 157 char home_dir[MAX_PATH]; 158 159 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) { 160 os::jvm_path(home_dir, sizeof(home_dir)); 161 // Found the full path to jvm[_g].dll. 162 // Now cut the path to <java_home>/jre if we can. 163 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */ 164 pslash = strrchr(home_dir, '\\'); 165 if (pslash != NULL) { 166 *pslash = '\0'; /* get rid of \{client|server} */ 167 pslash = strrchr(home_dir, '\\'); 168 if (pslash != NULL) 169 *pslash = '\0'; /* get rid of \bin */ 170 } 171 } 172 173 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1); 174 if (home_path == NULL) 175 return; 176 strcpy(home_path, home_dir); 177 Arguments::set_java_home(home_path); 178 179 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1); 180 if (dll_path == NULL) 181 return; 182 strcpy(dll_path, home_dir); 183 strcat(dll_path, bin); 184 Arguments::set_dll_dir(dll_path); 185 186 if (!set_boot_path('\\', ';')) 187 return; 188 } 189 190 /* library_path */ 191 #define EXT_DIR "\\lib\\ext" 192 #define BIN_DIR "\\bin" 193 #define PACKAGE_DIR "\\Sun\\Java" 194 { 195 /* Win32 library search order (See the documentation for LoadLibrary): 196 * 197 * 1. The directory from which application is loaded. 198 * 2. The current directory 199 * 3. The system wide Java Extensions directory (Java only) 200 * 4. System directory (GetSystemDirectory) 201 * 5. Windows directory (GetWindowsDirectory) 202 * 6. The PATH environment variable 203 */ 204 205 char *library_path; 206 char tmp[MAX_PATH]; 207 char *path_str = ::getenv("PATH"); 208 209 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 210 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10); 211 212 library_path[0] = '\0'; 213 214 GetModuleFileName(NULL, tmp, sizeof(tmp)); 215 *(strrchr(tmp, '\\')) = '\0'; 216 strcat(library_path, tmp); 217 218 strcat(library_path, ";."); 219 220 GetWindowsDirectory(tmp, sizeof(tmp)); 221 strcat(library_path, ";"); 222 strcat(library_path, tmp); 223 strcat(library_path, PACKAGE_DIR BIN_DIR); 224 225 GetSystemDirectory(tmp, sizeof(tmp)); 226 strcat(library_path, ";"); 227 strcat(library_path, tmp); 228 229 GetWindowsDirectory(tmp, sizeof(tmp)); 230 strcat(library_path, ";"); 231 strcat(library_path, tmp); 232 233 if (path_str) { 234 strcat(library_path, ";"); 235 strcat(library_path, path_str); 236 } 237 238 Arguments::set_library_path(library_path); 239 FREE_C_HEAP_ARRAY(char, library_path); 240 } 241 242 /* Default extensions directory */ 243 { 244 char path[MAX_PATH]; 245 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 246 GetWindowsDirectory(path, MAX_PATH); 247 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 248 path, PACKAGE_DIR, EXT_DIR); 249 Arguments::set_ext_dirs(buf); 250 } 251 #undef EXT_DIR 252 #undef BIN_DIR 253 #undef PACKAGE_DIR 254 255 /* Default endorsed standards directory. */ 256 { 257 #define ENDORSED_DIR "\\lib\\endorsed" 258 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR); 259 char * buf = NEW_C_HEAP_ARRAY(char, len); 260 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR); 261 Arguments::set_endorsed_dirs(buf); 262 #undef ENDORSED_DIR 263 } 264 265 #ifndef _WIN64 266 // set our UnhandledExceptionFilter and save any previous one 267 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception); 268 #endif 269 270 // Done 271 return; 272 } 273 274 void os::breakpoint() { 275 DebugBreak(); 276 } 277 278 // Invoked from the BREAKPOINT Macro 279 extern "C" void breakpoint() { 280 os::breakpoint(); 281 } 282 283 // Returns an estimate of the current stack pointer. Result must be guaranteed 284 // to point into the calling threads stack, and be no lower than the current 285 // stack pointer. 286 287 address os::current_stack_pointer() { 288 int dummy; 289 address sp = (address)&dummy; 290 return sp; 291 } 292 293 // os::current_stack_base() 294 // 295 // Returns the base of the stack, which is the stack's 296 // starting address. This function must be called 297 // while running on the stack of the thread being queried. 298 299 address os::current_stack_base() { 300 MEMORY_BASIC_INFORMATION minfo; 301 address stack_bottom; 302 size_t stack_size; 303 304 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 305 stack_bottom = (address)minfo.AllocationBase; 306 stack_size = minfo.RegionSize; 307 308 // Add up the sizes of all the regions with the same 309 // AllocationBase. 310 while( 1 ) 311 { 312 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 313 if ( stack_bottom == (address)minfo.AllocationBase ) 314 stack_size += minfo.RegionSize; 315 else 316 break; 317 } 318 319 #ifdef _M_IA64 320 // IA64 has memory and register stacks 321 stack_size = stack_size / 2; 322 #endif 323 return stack_bottom + stack_size; 324 } 325 326 size_t os::current_stack_size() { 327 size_t sz; 328 MEMORY_BASIC_INFORMATION minfo; 329 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 330 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 331 return sz; 332 } 333 334 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 335 const struct tm* time_struct_ptr = localtime(clock); 336 if (time_struct_ptr != NULL) { 337 *res = *time_struct_ptr; 338 return res; 339 } 340 return NULL; 341 } 342 343 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 344 345 // Thread start routine for all new Java threads 346 static unsigned __stdcall java_start(Thread* thread) { 347 // Try to randomize the cache line index of hot stack frames. 348 // This helps when threads of the same stack traces evict each other's 349 // cache lines. The threads can be either from the same JVM instance, or 350 // from different JVM instances. The benefit is especially true for 351 // processors with hyperthreading technology. 352 static int counter = 0; 353 int pid = os::current_process_id(); 354 _alloca(((pid ^ counter++) & 7) * 128); 355 356 OSThread* osthr = thread->osthread(); 357 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 358 359 if (UseNUMA) { 360 int lgrp_id = os::numa_get_group_id(); 361 if (lgrp_id != -1) { 362 thread->set_lgrp_id(lgrp_id); 363 } 364 } 365 366 367 if (UseVectoredExceptions) { 368 // If we are using vectored exception we don't need to set a SEH 369 thread->run(); 370 } 371 else { 372 // Install a win32 structured exception handler around every thread created 373 // by VM, so VM can genrate error dump when an exception occurred in non- 374 // Java thread (e.g. VM thread). 375 __try { 376 thread->run(); 377 } __except(topLevelExceptionFilter( 378 (_EXCEPTION_POINTERS*)_exception_info())) { 379 // Nothing to do. 380 } 381 } 382 383 // One less thread is executing 384 // When the VMThread gets here, the main thread may have already exited 385 // which frees the CodeHeap containing the Atomic::add code 386 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 387 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); 388 } 389 390 return 0; 391 } 392 393 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) { 394 // Allocate the OSThread object 395 OSThread* osthread = new OSThread(NULL, NULL); 396 if (osthread == NULL) return NULL; 397 398 // Initialize support for Java interrupts 399 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 400 if (interrupt_event == NULL) { 401 delete osthread; 402 return NULL; 403 } 404 osthread->set_interrupt_event(interrupt_event); 405 406 // Store info on the Win32 thread into the OSThread 407 osthread->set_thread_handle(thread_handle); 408 osthread->set_thread_id(thread_id); 409 410 if (UseNUMA) { 411 int lgrp_id = os::numa_get_group_id(); 412 if (lgrp_id != -1) { 413 thread->set_lgrp_id(lgrp_id); 414 } 415 } 416 417 // Initial thread state is INITIALIZED, not SUSPENDED 418 osthread->set_state(INITIALIZED); 419 420 return osthread; 421 } 422 423 424 bool os::create_attached_thread(JavaThread* thread) { 425 #ifdef ASSERT 426 thread->verify_not_published(); 427 #endif 428 HANDLE thread_h; 429 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 430 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 431 fatal("DuplicateHandle failed\n"); 432 } 433 OSThread* osthread = create_os_thread(thread, thread_h, 434 (int)current_thread_id()); 435 if (osthread == NULL) { 436 return false; 437 } 438 439 // Initial thread state is RUNNABLE 440 osthread->set_state(RUNNABLE); 441 442 thread->set_osthread(osthread); 443 return true; 444 } 445 446 bool os::create_main_thread(JavaThread* thread) { 447 #ifdef ASSERT 448 thread->verify_not_published(); 449 #endif 450 if (_starting_thread == NULL) { 451 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 452 if (_starting_thread == NULL) { 453 return false; 454 } 455 } 456 457 // The primordial thread is runnable from the start) 458 _starting_thread->set_state(RUNNABLE); 459 460 thread->set_osthread(_starting_thread); 461 return true; 462 } 463 464 // Allocate and initialize a new OSThread 465 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 466 unsigned thread_id; 467 468 // Allocate the OSThread object 469 OSThread* osthread = new OSThread(NULL, NULL); 470 if (osthread == NULL) { 471 return false; 472 } 473 474 // Initialize support for Java interrupts 475 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 476 if (interrupt_event == NULL) { 477 delete osthread; 478 return NULL; 479 } 480 osthread->set_interrupt_event(interrupt_event); 481 osthread->set_interrupted(false); 482 483 thread->set_osthread(osthread); 484 485 if (stack_size == 0) { 486 switch (thr_type) { 487 case os::java_thread: 488 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 489 if (JavaThread::stack_size_at_create() > 0) 490 stack_size = JavaThread::stack_size_at_create(); 491 break; 492 case os::compiler_thread: 493 if (CompilerThreadStackSize > 0) { 494 stack_size = (size_t)(CompilerThreadStackSize * K); 495 break; 496 } // else fall through: 497 // use VMThreadStackSize if CompilerThreadStackSize is not defined 498 case os::vm_thread: 499 case os::pgc_thread: 500 case os::cgc_thread: 501 case os::watcher_thread: 502 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 503 break; 504 } 505 } 506 507 // Create the Win32 thread 508 // 509 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 510 // does not specify stack size. Instead, it specifies the size of 511 // initially committed space. The stack size is determined by 512 // PE header in the executable. If the committed "stack_size" is larger 513 // than default value in the PE header, the stack is rounded up to the 514 // nearest multiple of 1MB. For example if the launcher has default 515 // stack size of 320k, specifying any size less than 320k does not 516 // affect the actual stack size at all, it only affects the initial 517 // commitment. On the other hand, specifying 'stack_size' larger than 518 // default value may cause significant increase in memory usage, because 519 // not only the stack space will be rounded up to MB, but also the 520 // entire space is committed upfront. 521 // 522 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 523 // for CreateThread() that can treat 'stack_size' as stack size. However we 524 // are not supposed to call CreateThread() directly according to MSDN 525 // document because JVM uses C runtime library. The good news is that the 526 // flag appears to work with _beginthredex() as well. 527 528 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION 529 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000) 530 #endif 531 532 HANDLE thread_handle = 533 (HANDLE)_beginthreadex(NULL, 534 (unsigned)stack_size, 535 (unsigned (__stdcall *)(void*)) java_start, 536 thread, 537 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, 538 &thread_id); 539 if (thread_handle == NULL) { 540 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again 541 // without the flag. 542 thread_handle = 543 (HANDLE)_beginthreadex(NULL, 544 (unsigned)stack_size, 545 (unsigned (__stdcall *)(void*)) java_start, 546 thread, 547 CREATE_SUSPENDED, 548 &thread_id); 549 } 550 if (thread_handle == NULL) { 551 // Need to clean up stuff we've allocated so far 552 CloseHandle(osthread->interrupt_event()); 553 thread->set_osthread(NULL); 554 delete osthread; 555 return NULL; 556 } 557 558 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); 559 560 // Store info on the Win32 thread into the OSThread 561 osthread->set_thread_handle(thread_handle); 562 osthread->set_thread_id(thread_id); 563 564 // Initial thread state is INITIALIZED, not SUSPENDED 565 osthread->set_state(INITIALIZED); 566 567 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 568 return true; 569 } 570 571 572 // Free Win32 resources related to the OSThread 573 void os::free_thread(OSThread* osthread) { 574 assert(osthread != NULL, "osthread not set"); 575 CloseHandle(osthread->thread_handle()); 576 CloseHandle(osthread->interrupt_event()); 577 delete osthread; 578 } 579 580 581 static int has_performance_count = 0; 582 static jlong first_filetime; 583 static jlong initial_performance_count; 584 static jlong performance_frequency; 585 586 587 jlong as_long(LARGE_INTEGER x) { 588 jlong result = 0; // initialization to avoid warning 589 set_high(&result, x.HighPart); 590 set_low(&result, x.LowPart); 591 return result; 592 } 593 594 595 jlong os::elapsed_counter() { 596 LARGE_INTEGER count; 597 if (has_performance_count) { 598 QueryPerformanceCounter(&count); 599 return as_long(count) - initial_performance_count; 600 } else { 601 FILETIME wt; 602 GetSystemTimeAsFileTime(&wt); 603 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime); 604 } 605 } 606 607 608 jlong os::elapsed_frequency() { 609 if (has_performance_count) { 610 return performance_frequency; 611 } else { 612 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601. 613 return 10000000; 614 } 615 } 616 617 618 julong os::available_memory() { 619 return win32::available_memory(); 620 } 621 622 julong os::win32::available_memory() { 623 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 624 // value if total memory is larger than 4GB 625 MEMORYSTATUSEX ms; 626 ms.dwLength = sizeof(ms); 627 GlobalMemoryStatusEx(&ms); 628 629 return (julong)ms.ullAvailPhys; 630 } 631 632 julong os::physical_memory() { 633 return win32::physical_memory(); 634 } 635 636 julong os::allocatable_physical_memory(julong size) { 637 #ifdef _LP64 638 return size; 639 #else 640 // Limit to 1400m because of the 2gb address space wall 641 return MIN2(size, (julong)1400*M); 642 #endif 643 } 644 645 // VC6 lacks DWORD_PTR 646 #if _MSC_VER < 1300 647 typedef UINT_PTR DWORD_PTR; 648 #endif 649 650 int os::active_processor_count() { 651 DWORD_PTR lpProcessAffinityMask = 0; 652 DWORD_PTR lpSystemAffinityMask = 0; 653 int proc_count = processor_count(); 654 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 655 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 656 // Nof active processors is number of bits in process affinity mask 657 int bitcount = 0; 658 while (lpProcessAffinityMask != 0) { 659 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 660 bitcount++; 661 } 662 return bitcount; 663 } else { 664 return proc_count; 665 } 666 } 667 668 bool os::distribute_processes(uint length, uint* distribution) { 669 // Not yet implemented. 670 return false; 671 } 672 673 bool os::bind_to_processor(uint processor_id) { 674 // Not yet implemented. 675 return false; 676 } 677 678 static void initialize_performance_counter() { 679 LARGE_INTEGER count; 680 if (QueryPerformanceFrequency(&count)) { 681 has_performance_count = 1; 682 performance_frequency = as_long(count); 683 QueryPerformanceCounter(&count); 684 initial_performance_count = as_long(count); 685 } else { 686 has_performance_count = 0; 687 FILETIME wt; 688 GetSystemTimeAsFileTime(&wt); 689 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 690 } 691 } 692 693 694 double os::elapsedTime() { 695 return (double) elapsed_counter() / (double) elapsed_frequency(); 696 } 697 698 699 // Windows format: 700 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 701 // Java format: 702 // Java standards require the number of milliseconds since 1/1/1970 703 704 // Constant offset - calculated using offset() 705 static jlong _offset = 116444736000000000; 706 // Fake time counter for reproducible results when debugging 707 static jlong fake_time = 0; 708 709 #ifdef ASSERT 710 // Just to be safe, recalculate the offset in debug mode 711 static jlong _calculated_offset = 0; 712 static int _has_calculated_offset = 0; 713 714 jlong offset() { 715 if (_has_calculated_offset) return _calculated_offset; 716 SYSTEMTIME java_origin; 717 java_origin.wYear = 1970; 718 java_origin.wMonth = 1; 719 java_origin.wDayOfWeek = 0; // ignored 720 java_origin.wDay = 1; 721 java_origin.wHour = 0; 722 java_origin.wMinute = 0; 723 java_origin.wSecond = 0; 724 java_origin.wMilliseconds = 0; 725 FILETIME jot; 726 if (!SystemTimeToFileTime(&java_origin, &jot)) { 727 fatal(err_msg("Error = %d\nWindows error", GetLastError())); 728 } 729 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 730 _has_calculated_offset = 1; 731 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 732 return _calculated_offset; 733 } 734 #else 735 jlong offset() { 736 return _offset; 737 } 738 #endif 739 740 jlong windows_to_java_time(FILETIME wt) { 741 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 742 return (a - offset()) / 10000; 743 } 744 745 FILETIME java_to_windows_time(jlong l) { 746 jlong a = (l * 10000) + offset(); 747 FILETIME result; 748 result.dwHighDateTime = high(a); 749 result.dwLowDateTime = low(a); 750 return result; 751 } 752 753 // For now, we say that Windows does not support vtime. I have no idea 754 // whether it can actually be made to (DLD, 9/13/05). 755 756 bool os::supports_vtime() { return false; } 757 bool os::enable_vtime() { return false; } 758 bool os::vtime_enabled() { return false; } 759 double os::elapsedVTime() { 760 // better than nothing, but not much 761 return elapsedTime(); 762 } 763 764 jlong os::javaTimeMillis() { 765 if (UseFakeTimers) { 766 return fake_time++; 767 } else { 768 FILETIME wt; 769 GetSystemTimeAsFileTime(&wt); 770 return windows_to_java_time(wt); 771 } 772 } 773 774 #define NANOS_PER_SEC CONST64(1000000000) 775 #define NANOS_PER_MILLISEC 1000000 776 jlong os::javaTimeNanos() { 777 if (!has_performance_count) { 778 return javaTimeMillis() * NANOS_PER_MILLISEC; // the best we can do. 779 } else { 780 LARGE_INTEGER current_count; 781 QueryPerformanceCounter(¤t_count); 782 double current = as_long(current_count); 783 double freq = performance_frequency; 784 jlong time = (jlong)((current/freq) * NANOS_PER_SEC); 785 return time; 786 } 787 } 788 789 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 790 if (!has_performance_count) { 791 // javaTimeMillis() doesn't have much percision, 792 // but it is not going to wrap -- so all 64 bits 793 info_ptr->max_value = ALL_64_BITS; 794 795 // this is a wall clock timer, so may skip 796 info_ptr->may_skip_backward = true; 797 info_ptr->may_skip_forward = true; 798 } else { 799 jlong freq = performance_frequency; 800 if (freq < NANOS_PER_SEC) { 801 // the performance counter is 64 bits and we will 802 // be multiplying it -- so no wrap in 64 bits 803 info_ptr->max_value = ALL_64_BITS; 804 } else if (freq > NANOS_PER_SEC) { 805 // use the max value the counter can reach to 806 // determine the max value which could be returned 807 julong max_counter = (julong)ALL_64_BITS; 808 info_ptr->max_value = (jlong)(max_counter / (freq / NANOS_PER_SEC)); 809 } else { 810 // the performance counter is 64 bits and we will 811 // be using it directly -- so no wrap in 64 bits 812 info_ptr->max_value = ALL_64_BITS; 813 } 814 815 // using a counter, so no skipping 816 info_ptr->may_skip_backward = false; 817 info_ptr->may_skip_forward = false; 818 } 819 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 820 } 821 822 char* os::local_time_string(char *buf, size_t buflen) { 823 SYSTEMTIME st; 824 GetLocalTime(&st); 825 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 826 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 827 return buf; 828 } 829 830 bool os::getTimesSecs(double* process_real_time, 831 double* process_user_time, 832 double* process_system_time) { 833 HANDLE h_process = GetCurrentProcess(); 834 FILETIME create_time, exit_time, kernel_time, user_time; 835 BOOL result = GetProcessTimes(h_process, 836 &create_time, 837 &exit_time, 838 &kernel_time, 839 &user_time); 840 if (result != 0) { 841 FILETIME wt; 842 GetSystemTimeAsFileTime(&wt); 843 jlong rtc_millis = windows_to_java_time(wt); 844 jlong user_millis = windows_to_java_time(user_time); 845 jlong system_millis = windows_to_java_time(kernel_time); 846 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 847 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); 848 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); 849 return true; 850 } else { 851 return false; 852 } 853 } 854 855 void os::shutdown() { 856 857 // allow PerfMemory to attempt cleanup of any persistent resources 858 perfMemory_exit(); 859 860 // flush buffered output, finish log files 861 ostream_abort(); 862 863 // Check for abort hook 864 abort_hook_t abort_hook = Arguments::abort_hook(); 865 if (abort_hook != NULL) { 866 abort_hook(); 867 } 868 } 869 870 void os::abort(bool dump_core) 871 { 872 os::shutdown(); 873 // no core dump on Windows 874 ::exit(1); 875 } 876 877 // Die immediately, no exit hook, no abort hook, no cleanup. 878 void os::die() { 879 _exit(-1); 880 } 881 882 // Directory routines copied from src/win32/native/java/io/dirent_md.c 883 // * dirent_md.c 1.15 00/02/02 884 // 885 // The declarations for DIR and struct dirent are in jvm_win32.h. 886 887 /* Caller must have already run dirname through JVM_NativePath, which removes 888 duplicate slashes and converts all instances of '/' into '\\'. */ 889 890 DIR * 891 os::opendir(const char *dirname) 892 { 893 assert(dirname != NULL, "just checking"); // hotspot change 894 DIR *dirp = (DIR *)malloc(sizeof(DIR)); 895 DWORD fattr; // hotspot change 896 char alt_dirname[4] = { 0, 0, 0, 0 }; 897 898 if (dirp == 0) { 899 errno = ENOMEM; 900 return 0; 901 } 902 903 /* 904 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it 905 * as a directory in FindFirstFile(). We detect this case here and 906 * prepend the current drive name. 907 */ 908 if (dirname[1] == '\0' && dirname[0] == '\\') { 909 alt_dirname[0] = _getdrive() + 'A' - 1; 910 alt_dirname[1] = ':'; 911 alt_dirname[2] = '\\'; 912 alt_dirname[3] = '\0'; 913 dirname = alt_dirname; 914 } 915 916 dirp->path = (char *)malloc(strlen(dirname) + 5); 917 if (dirp->path == 0) { 918 free(dirp); 919 errno = ENOMEM; 920 return 0; 921 } 922 strcpy(dirp->path, dirname); 923 924 fattr = GetFileAttributes(dirp->path); 925 if (fattr == 0xffffffff) { 926 free(dirp->path); 927 free(dirp); 928 errno = ENOENT; 929 return 0; 930 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 931 free(dirp->path); 932 free(dirp); 933 errno = ENOTDIR; 934 return 0; 935 } 936 937 /* Append "*.*", or possibly "\\*.*", to path */ 938 if (dirp->path[1] == ':' 939 && (dirp->path[2] == '\0' 940 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 941 /* No '\\' needed for cases like "Z:" or "Z:\" */ 942 strcat(dirp->path, "*.*"); 943 } else { 944 strcat(dirp->path, "\\*.*"); 945 } 946 947 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 948 if (dirp->handle == INVALID_HANDLE_VALUE) { 949 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 950 free(dirp->path); 951 free(dirp); 952 errno = EACCES; 953 return 0; 954 } 955 } 956 return dirp; 957 } 958 959 /* parameter dbuf unused on Windows */ 960 961 struct dirent * 962 os::readdir(DIR *dirp, dirent *dbuf) 963 { 964 assert(dirp != NULL, "just checking"); // hotspot change 965 if (dirp->handle == INVALID_HANDLE_VALUE) { 966 return 0; 967 } 968 969 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 970 971 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 972 if (GetLastError() == ERROR_INVALID_HANDLE) { 973 errno = EBADF; 974 return 0; 975 } 976 FindClose(dirp->handle); 977 dirp->handle = INVALID_HANDLE_VALUE; 978 } 979 980 return &dirp->dirent; 981 } 982 983 int 984 os::closedir(DIR *dirp) 985 { 986 assert(dirp != NULL, "just checking"); // hotspot change 987 if (dirp->handle != INVALID_HANDLE_VALUE) { 988 if (!FindClose(dirp->handle)) { 989 errno = EBADF; 990 return -1; 991 } 992 dirp->handle = INVALID_HANDLE_VALUE; 993 } 994 free(dirp->path); 995 free(dirp); 996 return 0; 997 } 998 999 const char* os::dll_file_extension() { return ".dll"; } 1000 1001 const char* os::get_temp_directory() { 1002 const char *prop = Arguments::get_property("java.io.tmpdir"); 1003 if (prop != 0) return prop; 1004 static char path_buf[MAX_PATH]; 1005 if (GetTempPath(MAX_PATH, path_buf)>0) 1006 return path_buf; 1007 else{ 1008 path_buf[0]='\0'; 1009 return path_buf; 1010 } 1011 } 1012 1013 static bool file_exists(const char* filename) { 1014 if (filename == NULL || strlen(filename) == 0) { 1015 return false; 1016 } 1017 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES; 1018 } 1019 1020 void os::dll_build_name(char *buffer, size_t buflen, 1021 const char* pname, const char* fname) { 1022 // Copied from libhpi 1023 const size_t pnamelen = pname ? strlen(pname) : 0; 1024 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0; 1025 1026 // Quietly truncates on buffer overflow. Should be an error. 1027 if (pnamelen + strlen(fname) + 10 > buflen) { 1028 *buffer = '\0'; 1029 return; 1030 } 1031 1032 if (pnamelen == 0) { 1033 jio_snprintf(buffer, buflen, "%s.dll", fname); 1034 } else if (c == ':' || c == '\\') { 1035 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname); 1036 } else if (strchr(pname, *os::path_separator()) != NULL) { 1037 int n; 1038 char** pelements = split_path(pname, &n); 1039 for (int i = 0 ; i < n ; i++) { 1040 char* path = pelements[i]; 1041 // Really shouldn't be NULL, but check can't hurt 1042 size_t plen = (path == NULL) ? 0 : strlen(path); 1043 if (plen == 0) { 1044 continue; // skip the empty path values 1045 } 1046 const char lastchar = path[plen - 1]; 1047 if (lastchar == ':' || lastchar == '\\') { 1048 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname); 1049 } else { 1050 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname); 1051 } 1052 if (file_exists(buffer)) { 1053 break; 1054 } 1055 } 1056 // release the storage 1057 for (int i = 0 ; i < n ; i++) { 1058 if (pelements[i] != NULL) { 1059 FREE_C_HEAP_ARRAY(char, pelements[i]); 1060 } 1061 } 1062 if (pelements != NULL) { 1063 FREE_C_HEAP_ARRAY(char*, pelements); 1064 } 1065 } else { 1066 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname); 1067 } 1068 } 1069 1070 // Needs to be in os specific directory because windows requires another 1071 // header file <direct.h> 1072 const char* os::get_current_directory(char *buf, int buflen) { 1073 return _getcwd(buf, buflen); 1074 } 1075 1076 //----------------------------------------------------------- 1077 // Helper functions for fatal error handler 1078 1079 // The following library functions are resolved dynamically at runtime: 1080 1081 // PSAPI functions, for Windows NT, 2000, XP 1082 1083 // psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform 1084 // SDK from Microsoft. Here are the definitions copied from psapi.h 1085 typedef struct _MODULEINFO { 1086 LPVOID lpBaseOfDll; 1087 DWORD SizeOfImage; 1088 LPVOID EntryPoint; 1089 } MODULEINFO, *LPMODULEINFO; 1090 1091 static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD ); 1092 static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD ); 1093 static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD ); 1094 1095 // ToolHelp Functions, for Windows 95, 98 and ME 1096 1097 static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ; 1098 static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ; 1099 static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ; 1100 1101 bool _has_psapi; 1102 bool _psapi_init = false; 1103 bool _has_toolhelp; 1104 1105 static bool _init_psapi() { 1106 HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ; 1107 if( psapi == NULL ) return false ; 1108 1109 _EnumProcessModules = CAST_TO_FN_PTR( 1110 BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD), 1111 GetProcAddress(psapi, "EnumProcessModules")) ; 1112 _GetModuleFileNameEx = CAST_TO_FN_PTR( 1113 DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD), 1114 GetProcAddress(psapi, "GetModuleFileNameExA")); 1115 _GetModuleInformation = CAST_TO_FN_PTR( 1116 BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD), 1117 GetProcAddress(psapi, "GetModuleInformation")); 1118 1119 _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation); 1120 _psapi_init = true; 1121 return _has_psapi; 1122 } 1123 1124 static bool _init_toolhelp() { 1125 HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ; 1126 if (kernel32 == NULL) return false ; 1127 1128 _CreateToolhelp32Snapshot = CAST_TO_FN_PTR( 1129 HANDLE(WINAPI *)(DWORD,DWORD), 1130 GetProcAddress(kernel32, "CreateToolhelp32Snapshot")); 1131 _Module32First = CAST_TO_FN_PTR( 1132 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32), 1133 GetProcAddress(kernel32, "Module32First" )); 1134 _Module32Next = CAST_TO_FN_PTR( 1135 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32), 1136 GetProcAddress(kernel32, "Module32Next" )); 1137 1138 _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next); 1139 return _has_toolhelp; 1140 } 1141 1142 #ifdef _WIN64 1143 // Helper routine which returns true if address in 1144 // within the NTDLL address space. 1145 // 1146 static bool _addr_in_ntdll( address addr ) 1147 { 1148 HMODULE hmod; 1149 MODULEINFO minfo; 1150 1151 hmod = GetModuleHandle("NTDLL.DLL"); 1152 if ( hmod == NULL ) return false; 1153 if ( !_GetModuleInformation( GetCurrentProcess(), hmod, 1154 &minfo, sizeof(MODULEINFO)) ) 1155 return false; 1156 1157 if ( (addr >= minfo.lpBaseOfDll) && 1158 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) 1159 return true; 1160 else 1161 return false; 1162 } 1163 #endif 1164 1165 1166 // Enumerate all modules for a given process ID 1167 // 1168 // Notice that Windows 95/98/Me and Windows NT/2000/XP have 1169 // different API for doing this. We use PSAPI.DLL on NT based 1170 // Windows and ToolHelp on 95/98/Me. 1171 1172 // Callback function that is called by enumerate_modules() on 1173 // every DLL module. 1174 // Input parameters: 1175 // int pid, 1176 // char* module_file_name, 1177 // address module_base_addr, 1178 // unsigned module_size, 1179 // void* param 1180 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *); 1181 1182 // enumerate_modules for Windows NT, using PSAPI 1183 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param) 1184 { 1185 HANDLE hProcess ; 1186 1187 # define MAX_NUM_MODULES 128 1188 HMODULE modules[MAX_NUM_MODULES]; 1189 static char filename[ MAX_PATH ]; 1190 int result = 0; 1191 1192 if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0; 1193 1194 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1195 FALSE, pid ) ; 1196 if (hProcess == NULL) return 0; 1197 1198 DWORD size_needed; 1199 if (!_EnumProcessModules(hProcess, modules, 1200 sizeof(modules), &size_needed)) { 1201 CloseHandle( hProcess ); 1202 return 0; 1203 } 1204 1205 // number of modules that are currently loaded 1206 int num_modules = size_needed / sizeof(HMODULE); 1207 1208 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1209 // Get Full pathname: 1210 if(!_GetModuleFileNameEx(hProcess, modules[i], 1211 filename, sizeof(filename))) { 1212 filename[0] = '\0'; 1213 } 1214 1215 MODULEINFO modinfo; 1216 if (!_GetModuleInformation(hProcess, modules[i], 1217 &modinfo, sizeof(modinfo))) { 1218 modinfo.lpBaseOfDll = NULL; 1219 modinfo.SizeOfImage = 0; 1220 } 1221 1222 // Invoke callback function 1223 result = func(pid, filename, (address)modinfo.lpBaseOfDll, 1224 modinfo.SizeOfImage, param); 1225 if (result) break; 1226 } 1227 1228 CloseHandle( hProcess ) ; 1229 return result; 1230 } 1231 1232 1233 // enumerate_modules for Windows 95/98/ME, using TOOLHELP 1234 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param) 1235 { 1236 HANDLE hSnapShot ; 1237 static MODULEENTRY32 modentry ; 1238 int result = 0; 1239 1240 if (!_has_toolhelp) return 0; 1241 1242 // Get a handle to a Toolhelp snapshot of the system 1243 hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ; 1244 if( hSnapShot == INVALID_HANDLE_VALUE ) { 1245 return FALSE ; 1246 } 1247 1248 // iterate through all modules 1249 modentry.dwSize = sizeof(MODULEENTRY32) ; 1250 bool not_done = _Module32First( hSnapShot, &modentry ) != 0; 1251 1252 while( not_done ) { 1253 // invoke the callback 1254 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr, 1255 modentry.modBaseSize, param); 1256 if (result) break; 1257 1258 modentry.dwSize = sizeof(MODULEENTRY32) ; 1259 not_done = _Module32Next( hSnapShot, &modentry ) != 0; 1260 } 1261 1262 CloseHandle(hSnapShot); 1263 return result; 1264 } 1265 1266 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param ) 1267 { 1268 // Get current process ID if caller doesn't provide it. 1269 if (!pid) pid = os::current_process_id(); 1270 1271 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param); 1272 else return _enumerate_modules_windows(pid, func, param); 1273 } 1274 1275 struct _modinfo { 1276 address addr; 1277 char* full_path; // point to a char buffer 1278 int buflen; // size of the buffer 1279 address base_addr; 1280 }; 1281 1282 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr, 1283 unsigned size, void * param) { 1284 struct _modinfo *pmod = (struct _modinfo *)param; 1285 if (!pmod) return -1; 1286 1287 if (base_addr <= pmod->addr && 1288 base_addr+size > pmod->addr) { 1289 // if a buffer is provided, copy path name to the buffer 1290 if (pmod->full_path) { 1291 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1292 } 1293 pmod->base_addr = base_addr; 1294 return 1; 1295 } 1296 return 0; 1297 } 1298 1299 bool os::dll_address_to_library_name(address addr, char* buf, 1300 int buflen, int* offset) { 1301 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1302 // return the full path to the DLL file, sometimes it returns path 1303 // to the corresponding PDB file (debug info); sometimes it only 1304 // returns partial path, which makes life painful. 1305 1306 struct _modinfo mi; 1307 mi.addr = addr; 1308 mi.full_path = buf; 1309 mi.buflen = buflen; 1310 int pid = os::current_process_id(); 1311 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) { 1312 // buf already contains path name 1313 if (offset) *offset = addr - mi.base_addr; 1314 return true; 1315 } else { 1316 if (buf) buf[0] = '\0'; 1317 if (offset) *offset = -1; 1318 return false; 1319 } 1320 } 1321 1322 bool os::dll_address_to_function_name(address addr, char *buf, 1323 int buflen, int *offset) { 1324 // Unimplemented on Windows - in order to use SymGetSymFromAddr(), 1325 // we need to initialize imagehlp/dbghelp, then load symbol table 1326 // for every module. That's too much work to do after a fatal error. 1327 // For an example on how to implement this function, see 1.4.2. 1328 if (offset) *offset = -1; 1329 if (buf) buf[0] = '\0'; 1330 return false; 1331 } 1332 1333 void* os::dll_lookup(void* handle, const char* name) { 1334 return GetProcAddress((HMODULE)handle, name); 1335 } 1336 1337 // save the start and end address of jvm.dll into param[0] and param[1] 1338 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr, 1339 unsigned size, void * param) { 1340 if (!param) return -1; 1341 1342 if (base_addr <= (address)_locate_jvm_dll && 1343 base_addr+size > (address)_locate_jvm_dll) { 1344 ((address*)param)[0] = base_addr; 1345 ((address*)param)[1] = base_addr + size; 1346 return 1; 1347 } 1348 return 0; 1349 } 1350 1351 address vm_lib_location[2]; // start and end address of jvm.dll 1352 1353 // check if addr is inside jvm.dll 1354 bool os::address_is_in_vm(address addr) { 1355 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1356 int pid = os::current_process_id(); 1357 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) { 1358 assert(false, "Can't find jvm module."); 1359 return false; 1360 } 1361 } 1362 1363 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1364 } 1365 1366 // print module info; param is outputStream* 1367 static int _print_module(int pid, char* fname, address base, 1368 unsigned size, void* param) { 1369 if (!param) return -1; 1370 1371 outputStream* st = (outputStream*)param; 1372 1373 address end_addr = base + size; 1374 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname); 1375 return 0; 1376 } 1377 1378 // Loads .dll/.so and 1379 // in case of error it checks if .dll/.so was built for the 1380 // same architecture as Hotspot is running on 1381 void * os::dll_load(const char *name, char *ebuf, int ebuflen) 1382 { 1383 void * result = LoadLibrary(name); 1384 if (result != NULL) 1385 { 1386 return result; 1387 } 1388 1389 long errcode = GetLastError(); 1390 if (errcode == ERROR_MOD_NOT_FOUND) { 1391 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1); 1392 ebuf[ebuflen-1]='\0'; 1393 return NULL; 1394 } 1395 1396 // Parsing dll below 1397 // If we can read dll-info and find that dll was built 1398 // for an architecture other than Hotspot is running in 1399 // - then print to buffer "DLL was built for a different architecture" 1400 // else call getLastErrorString to obtain system error message 1401 1402 // Read system error message into ebuf 1403 // It may or may not be overwritten below (in the for loop and just above) 1404 getLastErrorString(ebuf, (size_t) ebuflen); 1405 ebuf[ebuflen-1]='\0'; 1406 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0); 1407 if (file_descriptor<0) 1408 { 1409 return NULL; 1410 } 1411 1412 uint32_t signature_offset; 1413 uint16_t lib_arch=0; 1414 bool failed_to_get_lib_arch= 1415 ( 1416 //Go to position 3c in the dll 1417 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0) 1418 || 1419 // Read loacation of signature 1420 (sizeof(signature_offset)!= 1421 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset)))) 1422 || 1423 //Go to COFF File Header in dll 1424 //that is located after"signature" (4 bytes long) 1425 (os::seek_to_file_offset(file_descriptor, 1426 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0) 1427 || 1428 //Read field that contains code of architecture 1429 // that dll was build for 1430 (sizeof(lib_arch)!= 1431 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch)))) 1432 ); 1433 1434 ::close(file_descriptor); 1435 if (failed_to_get_lib_arch) 1436 { 1437 // file i/o error - report getLastErrorString(...) msg 1438 return NULL; 1439 } 1440 1441 typedef struct 1442 { 1443 uint16_t arch_code; 1444 char* arch_name; 1445 } arch_t; 1446 1447 static const arch_t arch_array[]={ 1448 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1449 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1450 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1451 }; 1452 #if (defined _M_IA64) 1453 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64; 1454 #elif (defined _M_AMD64) 1455 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64; 1456 #elif (defined _M_IX86) 1457 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386; 1458 #else 1459 #error Method os::dll_load requires that one of following \ 1460 is defined :_M_IA64,_M_AMD64 or _M_IX86 1461 #endif 1462 1463 1464 // Obtain a string for printf operation 1465 // lib_arch_str shall contain string what platform this .dll was built for 1466 // running_arch_str shall string contain what platform Hotspot was built for 1467 char *running_arch_str=NULL,*lib_arch_str=NULL; 1468 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++) 1469 { 1470 if (lib_arch==arch_array[i].arch_code) 1471 lib_arch_str=arch_array[i].arch_name; 1472 if (running_arch==arch_array[i].arch_code) 1473 running_arch_str=arch_array[i].arch_name; 1474 } 1475 1476 assert(running_arch_str, 1477 "Didn't find runing architecture code in arch_array"); 1478 1479 // If the architure is right 1480 // but some other error took place - report getLastErrorString(...) msg 1481 if (lib_arch == running_arch) 1482 { 1483 return NULL; 1484 } 1485 1486 if (lib_arch_str!=NULL) 1487 { 1488 ::_snprintf(ebuf, ebuflen-1, 1489 "Can't load %s-bit .dll on a %s-bit platform", 1490 lib_arch_str,running_arch_str); 1491 } 1492 else 1493 { 1494 // don't know what architecture this dll was build for 1495 ::_snprintf(ebuf, ebuflen-1, 1496 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1497 lib_arch,running_arch_str); 1498 } 1499 1500 return NULL; 1501 } 1502 1503 1504 void os::print_dll_info(outputStream *st) { 1505 int pid = os::current_process_id(); 1506 st->print_cr("Dynamic libraries:"); 1507 enumerate_modules(pid, _print_module, (void *)st); 1508 } 1509 1510 // function pointer to Windows API "GetNativeSystemInfo". 1511 typedef void (WINAPI *GetNativeSystemInfo_func_type)(LPSYSTEM_INFO); 1512 static GetNativeSystemInfo_func_type _GetNativeSystemInfo; 1513 1514 void os::print_os_info(outputStream* st) { 1515 st->print("OS:"); 1516 1517 OSVERSIONINFOEX osvi; 1518 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1519 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1520 1521 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1522 st->print_cr("N/A"); 1523 return; 1524 } 1525 1526 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion; 1527 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) { 1528 switch (os_vers) { 1529 case 3051: st->print(" Windows NT 3.51"); break; 1530 case 4000: st->print(" Windows NT 4.0"); break; 1531 case 5000: st->print(" Windows 2000"); break; 1532 case 5001: st->print(" Windows XP"); break; 1533 case 5002: 1534 case 6000: 1535 case 6001: { 1536 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1537 // find out whether we are running on 64 bit processor or not. 1538 SYSTEM_INFO si; 1539 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1540 // Check to see if _GetNativeSystemInfo has been initialized. 1541 if (_GetNativeSystemInfo == NULL) { 1542 HMODULE hKernel32 = GetModuleHandle(TEXT("kernel32.dll")); 1543 _GetNativeSystemInfo = 1544 CAST_TO_FN_PTR(GetNativeSystemInfo_func_type, 1545 GetProcAddress(hKernel32, 1546 "GetNativeSystemInfo")); 1547 if (_GetNativeSystemInfo == NULL) 1548 GetSystemInfo(&si); 1549 } else { 1550 _GetNativeSystemInfo(&si); 1551 } 1552 if (os_vers == 5002) { 1553 if (osvi.wProductType == VER_NT_WORKSTATION && 1554 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) 1555 st->print(" Windows XP x64 Edition"); 1556 else 1557 st->print(" Windows Server 2003 family"); 1558 } else if (os_vers == 6000) { 1559 if (osvi.wProductType == VER_NT_WORKSTATION) 1560 st->print(" Windows Vista"); 1561 else 1562 st->print(" Windows Server 2008"); 1563 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) 1564 st->print(" , 64 bit"); 1565 } else if (os_vers == 6001) { 1566 if (osvi.wProductType == VER_NT_WORKSTATION) { 1567 st->print(" Windows 7"); 1568 } else { 1569 // Unrecognized windows, print out its major and minor versions 1570 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1571 } 1572 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) 1573 st->print(" , 64 bit"); 1574 } else { // future os 1575 // Unrecognized windows, print out its major and minor versions 1576 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1577 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) 1578 st->print(" , 64 bit"); 1579 } 1580 break; 1581 } 1582 default: // future windows, print out its major and minor versions 1583 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1584 } 1585 } else { 1586 switch (os_vers) { 1587 case 4000: st->print(" Windows 95"); break; 1588 case 4010: st->print(" Windows 98"); break; 1589 case 4090: st->print(" Windows Me"); break; 1590 default: // future windows, print out its major and minor versions 1591 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1592 } 1593 } 1594 st->print(" Build %d", osvi.dwBuildNumber); 1595 st->print(" %s", osvi.szCSDVersion); // service pack 1596 st->cr(); 1597 } 1598 1599 void os::print_memory_info(outputStream* st) { 1600 st->print("Memory:"); 1601 st->print(" %dk page", os::vm_page_size()>>10); 1602 1603 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1604 // value if total memory is larger than 4GB 1605 MEMORYSTATUSEX ms; 1606 ms.dwLength = sizeof(ms); 1607 GlobalMemoryStatusEx(&ms); 1608 1609 st->print(", physical %uk", os::physical_memory() >> 10); 1610 st->print("(%uk free)", os::available_memory() >> 10); 1611 1612 st->print(", swap %uk", ms.ullTotalPageFile >> 10); 1613 st->print("(%uk free)", ms.ullAvailPageFile >> 10); 1614 st->cr(); 1615 } 1616 1617 void os::print_siginfo(outputStream *st, void *siginfo) { 1618 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1619 st->print("siginfo:"); 1620 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1621 1622 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1623 er->NumberParameters >= 2) { 1624 switch (er->ExceptionInformation[0]) { 1625 case 0: st->print(", reading address"); break; 1626 case 1: st->print(", writing address"); break; 1627 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1628 er->ExceptionInformation[0]); 1629 } 1630 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1631 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1632 er->NumberParameters >= 2 && UseSharedSpaces) { 1633 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1634 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1635 st->print("\n\nError accessing class data sharing archive." \ 1636 " Mapped file inaccessible during execution, " \ 1637 " possible disk/network problem."); 1638 } 1639 } else { 1640 int num = er->NumberParameters; 1641 if (num > 0) { 1642 st->print(", ExceptionInformation="); 1643 for (int i = 0; i < num; i++) { 1644 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1645 } 1646 } 1647 } 1648 st->cr(); 1649 } 1650 1651 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1652 // do nothing 1653 } 1654 1655 static char saved_jvm_path[MAX_PATH] = {0}; 1656 1657 // Find the full path to the current module, jvm.dll or jvm_g.dll 1658 void os::jvm_path(char *buf, jint buflen) { 1659 // Error checking. 1660 if (buflen < MAX_PATH) { 1661 assert(false, "must use a large-enough buffer"); 1662 buf[0] = '\0'; 1663 return; 1664 } 1665 // Lazy resolve the path to current module. 1666 if (saved_jvm_path[0] != 0) { 1667 strcpy(buf, saved_jvm_path); 1668 return; 1669 } 1670 1671 buf[0] = '\0'; 1672 if (strcmp(Arguments::sun_java_launcher(), "gamma") == 0) { 1673 // Support for the gamma launcher. Check for a JAVA_HOME 1674 // environment variable and fix up the path so it looks like 1675 // libjvm.so is installed there (append a fake suffix 1676 // hotspot/libjvm.so). 1677 char* java_home_var = ::getenv("JAVA_HOME"); 1678 if (java_home_var != NULL && java_home_var[0] != 0) { 1679 1680 strncpy(buf, java_home_var, buflen); 1681 1682 // determine if this is a legacy image or modules image 1683 // modules image doesn't have "jre" subdirectory 1684 size_t len = strlen(buf); 1685 char* jrebin_p = buf + len; 1686 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1687 if (0 != _access(buf, 0)) { 1688 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1689 } 1690 len = strlen(buf); 1691 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1692 } 1693 } 1694 1695 if(buf[0] == '\0') { 1696 GetModuleFileName(vm_lib_handle, buf, buflen); 1697 } 1698 strcpy(saved_jvm_path, buf); 1699 } 1700 1701 1702 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1703 #ifndef _WIN64 1704 st->print("_"); 1705 #endif 1706 } 1707 1708 1709 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1710 #ifndef _WIN64 1711 st->print("@%d", args_size * sizeof(int)); 1712 #endif 1713 } 1714 1715 // sun.misc.Signal 1716 // NOTE that this is a workaround for an apparent kernel bug where if 1717 // a signal handler for SIGBREAK is installed then that signal handler 1718 // takes priority over the console control handler for CTRL_CLOSE_EVENT. 1719 // See bug 4416763. 1720 static void (*sigbreakHandler)(int) = NULL; 1721 1722 static void UserHandler(int sig, void *siginfo, void *context) { 1723 os::signal_notify(sig); 1724 // We need to reinstate the signal handler each time... 1725 os::signal(sig, (void*)UserHandler); 1726 } 1727 1728 void* os::user_handler() { 1729 return (void*) UserHandler; 1730 } 1731 1732 void* os::signal(int signal_number, void* handler) { 1733 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1734 void (*oldHandler)(int) = sigbreakHandler; 1735 sigbreakHandler = (void (*)(int)) handler; 1736 return (void*) oldHandler; 1737 } else { 1738 return (void*)::signal(signal_number, (void (*)(int))handler); 1739 } 1740 } 1741 1742 void os::signal_raise(int signal_number) { 1743 raise(signal_number); 1744 } 1745 1746 // The Win32 C runtime library maps all console control events other than ^C 1747 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1748 // logoff, and shutdown events. We therefore install our own console handler 1749 // that raises SIGTERM for the latter cases. 1750 // 1751 static BOOL WINAPI consoleHandler(DWORD event) { 1752 switch(event) { 1753 case CTRL_C_EVENT: 1754 if (is_error_reported()) { 1755 // Ctrl-C is pressed during error reporting, likely because the error 1756 // handler fails to abort. Let VM die immediately. 1757 os::die(); 1758 } 1759 1760 os::signal_raise(SIGINT); 1761 return TRUE; 1762 break; 1763 case CTRL_BREAK_EVENT: 1764 if (sigbreakHandler != NULL) { 1765 (*sigbreakHandler)(SIGBREAK); 1766 } 1767 return TRUE; 1768 break; 1769 case CTRL_CLOSE_EVENT: 1770 case CTRL_LOGOFF_EVENT: 1771 case CTRL_SHUTDOWN_EVENT: 1772 os::signal_raise(SIGTERM); 1773 return TRUE; 1774 break; 1775 default: 1776 break; 1777 } 1778 return FALSE; 1779 } 1780 1781 /* 1782 * The following code is moved from os.cpp for making this 1783 * code platform specific, which it is by its very nature. 1784 */ 1785 1786 // Return maximum OS signal used + 1 for internal use only 1787 // Used as exit signal for signal_thread 1788 int os::sigexitnum_pd(){ 1789 return NSIG; 1790 } 1791 1792 // a counter for each possible signal value, including signal_thread exit signal 1793 static volatile jint pending_signals[NSIG+1] = { 0 }; 1794 static HANDLE sig_sem; 1795 1796 void os::signal_init_pd() { 1797 // Initialize signal structures 1798 memset((void*)pending_signals, 0, sizeof(pending_signals)); 1799 1800 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 1801 1802 // Programs embedding the VM do not want it to attempt to receive 1803 // events like CTRL_LOGOFF_EVENT, which are used to implement the 1804 // shutdown hooks mechanism introduced in 1.3. For example, when 1805 // the VM is run as part of a Windows NT service (i.e., a servlet 1806 // engine in a web server), the correct behavior is for any console 1807 // control handler to return FALSE, not TRUE, because the OS's 1808 // "final" handler for such events allows the process to continue if 1809 // it is a service (while terminating it if it is not a service). 1810 // To make this behavior uniform and the mechanism simpler, we 1811 // completely disable the VM's usage of these console events if -Xrs 1812 // (=ReduceSignalUsage) is specified. This means, for example, that 1813 // the CTRL-BREAK thread dump mechanism is also disabled in this 1814 // case. See bugs 4323062, 4345157, and related bugs. 1815 1816 if (!ReduceSignalUsage) { 1817 // Add a CTRL-C handler 1818 SetConsoleCtrlHandler(consoleHandler, TRUE); 1819 } 1820 } 1821 1822 void os::signal_notify(int signal_number) { 1823 BOOL ret; 1824 1825 Atomic::inc(&pending_signals[signal_number]); 1826 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 1827 assert(ret != 0, "ReleaseSemaphore() failed"); 1828 } 1829 1830 static int check_pending_signals(bool wait_for_signal) { 1831 DWORD ret; 1832 while (true) { 1833 for (int i = 0; i < NSIG + 1; i++) { 1834 jint n = pending_signals[i]; 1835 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1836 return i; 1837 } 1838 } 1839 if (!wait_for_signal) { 1840 return -1; 1841 } 1842 1843 JavaThread *thread = JavaThread::current(); 1844 1845 ThreadBlockInVM tbivm(thread); 1846 1847 bool threadIsSuspended; 1848 do { 1849 thread->set_suspend_equivalent(); 1850 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1851 ret = ::WaitForSingleObject(sig_sem, INFINITE); 1852 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 1853 1854 // were we externally suspended while we were waiting? 1855 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1856 if (threadIsSuspended) { 1857 // 1858 // The semaphore has been incremented, but while we were waiting 1859 // another thread suspended us. We don't want to continue running 1860 // while suspended because that would surprise the thread that 1861 // suspended us. 1862 // 1863 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 1864 assert(ret != 0, "ReleaseSemaphore() failed"); 1865 1866 thread->java_suspend_self(); 1867 } 1868 } while (threadIsSuspended); 1869 } 1870 } 1871 1872 int os::signal_lookup() { 1873 return check_pending_signals(false); 1874 } 1875 1876 int os::signal_wait() { 1877 return check_pending_signals(true); 1878 } 1879 1880 // Implicit OS exception handling 1881 1882 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) { 1883 JavaThread* thread = JavaThread::current(); 1884 // Save pc in thread 1885 #ifdef _M_IA64 1886 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP); 1887 // Set pc to handler 1888 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 1889 #elif _M_AMD64 1890 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip); 1891 // Set pc to handler 1892 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 1893 #else 1894 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip); 1895 // Set pc to handler 1896 exceptionInfo->ContextRecord->Eip = (LONG)handler; 1897 #endif 1898 1899 // Continue the execution 1900 return EXCEPTION_CONTINUE_EXECUTION; 1901 } 1902 1903 1904 // Used for PostMortemDump 1905 extern "C" void safepoints(); 1906 extern "C" void find(int x); 1907 extern "C" void events(); 1908 1909 // According to Windows API documentation, an illegal instruction sequence should generate 1910 // the 0xC000001C exception code. However, real world experience shows that occasionnaly 1911 // the execution of an illegal instruction can generate the exception code 0xC000001E. This 1912 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 1913 1914 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 1915 1916 // From "Execution Protection in the Windows Operating System" draft 0.35 1917 // Once a system header becomes available, the "real" define should be 1918 // included or copied here. 1919 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08 1920 1921 #define def_excpt(val) #val, val 1922 1923 struct siglabel { 1924 char *name; 1925 int number; 1926 }; 1927 1928 struct siglabel exceptlabels[] = { 1929 def_excpt(EXCEPTION_ACCESS_VIOLATION), 1930 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 1931 def_excpt(EXCEPTION_BREAKPOINT), 1932 def_excpt(EXCEPTION_SINGLE_STEP), 1933 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 1934 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 1935 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 1936 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 1937 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 1938 def_excpt(EXCEPTION_FLT_OVERFLOW), 1939 def_excpt(EXCEPTION_FLT_STACK_CHECK), 1940 def_excpt(EXCEPTION_FLT_UNDERFLOW), 1941 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 1942 def_excpt(EXCEPTION_INT_OVERFLOW), 1943 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 1944 def_excpt(EXCEPTION_IN_PAGE_ERROR), 1945 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 1946 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 1947 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 1948 def_excpt(EXCEPTION_STACK_OVERFLOW), 1949 def_excpt(EXCEPTION_INVALID_DISPOSITION), 1950 def_excpt(EXCEPTION_GUARD_PAGE), 1951 def_excpt(EXCEPTION_INVALID_HANDLE), 1952 NULL, 0 1953 }; 1954 1955 const char* os::exception_name(int exception_code, char *buf, size_t size) { 1956 for (int i = 0; exceptlabels[i].name != NULL; i++) { 1957 if (exceptlabels[i].number == exception_code) { 1958 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 1959 return buf; 1960 } 1961 } 1962 1963 return NULL; 1964 } 1965 1966 //----------------------------------------------------------------------------- 1967 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 1968 // handle exception caused by idiv; should only happen for -MinInt/-1 1969 // (division by zero is handled explicitly) 1970 #ifdef _M_IA64 1971 assert(0, "Fix Handle_IDiv_Exception"); 1972 #elif _M_AMD64 1973 PCONTEXT ctx = exceptionInfo->ContextRecord; 1974 address pc = (address)ctx->Rip; 1975 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc)); 1976 assert(pc[0] == 0xF7, "not an idiv opcode"); 1977 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 1978 assert(ctx->Rax == min_jint, "unexpected idiv exception"); 1979 // set correct result values and continue after idiv instruction 1980 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 1981 ctx->Rax = (DWORD)min_jint; // result 1982 ctx->Rdx = (DWORD)0; // remainder 1983 // Continue the execution 1984 #else 1985 PCONTEXT ctx = exceptionInfo->ContextRecord; 1986 address pc = (address)ctx->Eip; 1987 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc)); 1988 assert(pc[0] == 0xF7, "not an idiv opcode"); 1989 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 1990 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 1991 // set correct result values and continue after idiv instruction 1992 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 1993 ctx->Eax = (DWORD)min_jint; // result 1994 ctx->Edx = (DWORD)0; // remainder 1995 // Continue the execution 1996 #endif 1997 return EXCEPTION_CONTINUE_EXECUTION; 1998 } 1999 2000 #ifndef _WIN64 2001 //----------------------------------------------------------------------------- 2002 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2003 // handle exception caused by native method modifying control word 2004 PCONTEXT ctx = exceptionInfo->ContextRecord; 2005 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2006 2007 switch (exception_code) { 2008 case EXCEPTION_FLT_DENORMAL_OPERAND: 2009 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2010 case EXCEPTION_FLT_INEXACT_RESULT: 2011 case EXCEPTION_FLT_INVALID_OPERATION: 2012 case EXCEPTION_FLT_OVERFLOW: 2013 case EXCEPTION_FLT_STACK_CHECK: 2014 case EXCEPTION_FLT_UNDERFLOW: 2015 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2016 if (fp_control_word != ctx->FloatSave.ControlWord) { 2017 // Restore FPCW and mask out FLT exceptions 2018 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2019 // Mask out pending FLT exceptions 2020 ctx->FloatSave.StatusWord &= 0xffffff00; 2021 return EXCEPTION_CONTINUE_EXECUTION; 2022 } 2023 } 2024 2025 if (prev_uef_handler != NULL) { 2026 // We didn't handle this exception so pass it to the previous 2027 // UnhandledExceptionFilter. 2028 return (prev_uef_handler)(exceptionInfo); 2029 } 2030 2031 return EXCEPTION_CONTINUE_SEARCH; 2032 } 2033 #else //_WIN64 2034 /* 2035 On Windows, the mxcsr control bits are non-volatile across calls 2036 See also CR 6192333 2037 If EXCEPTION_FLT_* happened after some native method modified 2038 mxcsr - it is not a jvm fault. 2039 However should we decide to restore of mxcsr after a faulty 2040 native method we can uncomment following code 2041 jint MxCsr = INITIAL_MXCSR; 2042 // we can't use StubRoutines::addr_mxcsr_std() 2043 // because in Win64 mxcsr is not saved there 2044 if (MxCsr != ctx->MxCsr) { 2045 ctx->MxCsr = MxCsr; 2046 return EXCEPTION_CONTINUE_EXECUTION; 2047 } 2048 2049 */ 2050 #endif //_WIN64 2051 2052 2053 // Fatal error reporting is single threaded so we can make this a 2054 // static and preallocated. If it's more than MAX_PATH silently ignore 2055 // it. 2056 static char saved_error_file[MAX_PATH] = {0}; 2057 2058 void os::set_error_file(const char *logfile) { 2059 if (strlen(logfile) <= MAX_PATH) { 2060 strncpy(saved_error_file, logfile, MAX_PATH); 2061 } 2062 } 2063 2064 static inline void report_error(Thread* t, DWORD exception_code, 2065 address addr, void* siginfo, void* context) { 2066 VMError err(t, exception_code, addr, siginfo, context); 2067 err.report_and_die(); 2068 2069 // If UseOsErrorReporting, this will return here and save the error file 2070 // somewhere where we can find it in the minidump. 2071 } 2072 2073 //----------------------------------------------------------------------------- 2074 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2075 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2076 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2077 #ifdef _M_IA64 2078 address pc = (address) exceptionInfo->ContextRecord->StIIP; 2079 #elif _M_AMD64 2080 address pc = (address) exceptionInfo->ContextRecord->Rip; 2081 #else 2082 address pc = (address) exceptionInfo->ContextRecord->Eip; 2083 #endif 2084 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 2085 2086 #ifndef _WIN64 2087 // Execution protection violation - win32 running on AMD64 only 2088 // Handled first to avoid misdiagnosis as a "normal" access violation; 2089 // This is safe to do because we have a new/unique ExceptionInformation 2090 // code for this condition. 2091 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2092 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2093 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2094 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2095 2096 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2097 int page_size = os::vm_page_size(); 2098 2099 // Make sure the pc and the faulting address are sane. 2100 // 2101 // If an instruction spans a page boundary, and the page containing 2102 // the beginning of the instruction is executable but the following 2103 // page is not, the pc and the faulting address might be slightly 2104 // different - we still want to unguard the 2nd page in this case. 2105 // 2106 // 15 bytes seems to be a (very) safe value for max instruction size. 2107 bool pc_is_near_addr = 2108 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2109 bool instr_spans_page_boundary = 2110 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2111 (intptr_t) page_size) > 0); 2112 2113 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2114 static volatile address last_addr = 2115 (address) os::non_memory_address_word(); 2116 2117 // In conservative mode, don't unguard unless the address is in the VM 2118 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2119 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2120 2121 // Set memory to RWX and retry 2122 address page_start = 2123 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2124 bool res = os::protect_memory((char*) page_start, page_size, 2125 os::MEM_PROT_RWX); 2126 2127 if (PrintMiscellaneous && Verbose) { 2128 char buf[256]; 2129 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 2130 "at " INTPTR_FORMAT 2131 ", unguarding " INTPTR_FORMAT ": %s", addr, 2132 page_start, (res ? "success" : strerror(errno))); 2133 tty->print_raw_cr(buf); 2134 } 2135 2136 // Set last_addr so if we fault again at the same address, we don't 2137 // end up in an endless loop. 2138 // 2139 // There are two potential complications here. Two threads trapping 2140 // at the same address at the same time could cause one of the 2141 // threads to think it already unguarded, and abort the VM. Likely 2142 // very rare. 2143 // 2144 // The other race involves two threads alternately trapping at 2145 // different addresses and failing to unguard the page, resulting in 2146 // an endless loop. This condition is probably even more unlikely 2147 // than the first. 2148 // 2149 // Although both cases could be avoided by using locks or thread 2150 // local last_addr, these solutions are unnecessary complication: 2151 // this handler is a best-effort safety net, not a complete solution. 2152 // It is disabled by default and should only be used as a workaround 2153 // in case we missed any no-execute-unsafe VM code. 2154 2155 last_addr = addr; 2156 2157 return EXCEPTION_CONTINUE_EXECUTION; 2158 } 2159 } 2160 2161 // Last unguard failed or not unguarding 2162 tty->print_raw_cr("Execution protection violation"); 2163 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2164 exceptionInfo->ContextRecord); 2165 return EXCEPTION_CONTINUE_SEARCH; 2166 } 2167 } 2168 #endif // _WIN64 2169 2170 // Check to see if we caught the safepoint code in the 2171 // process of write protecting the memory serialization page. 2172 // It write enables the page immediately after protecting it 2173 // so just return. 2174 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { 2175 JavaThread* thread = (JavaThread*) t; 2176 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2177 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2178 if ( os::is_memory_serialize_page(thread, addr) ) { 2179 // Block current thread until the memory serialize page permission restored. 2180 os::block_on_serialize_page_trap(); 2181 return EXCEPTION_CONTINUE_EXECUTION; 2182 } 2183 } 2184 2185 2186 if (t != NULL && t->is_Java_thread()) { 2187 JavaThread* thread = (JavaThread*) t; 2188 bool in_java = thread->thread_state() == _thread_in_Java; 2189 2190 // Handle potential stack overflows up front. 2191 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2192 if (os::uses_stack_guard_pages()) { 2193 #ifdef _M_IA64 2194 // 2195 // If it's a legal stack address continue, Windows will map it in. 2196 // 2197 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2198 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2199 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) 2200 return EXCEPTION_CONTINUE_EXECUTION; 2201 2202 // The register save area is the same size as the memory stack 2203 // and starts at the page just above the start of the memory stack. 2204 // If we get a fault in this area, we've run out of register 2205 // stack. If we are in java, try throwing a stack overflow exception. 2206 if (addr > thread->stack_base() && 2207 addr <= (thread->stack_base()+thread->stack_size()) ) { 2208 char buf[256]; 2209 jio_snprintf(buf, sizeof(buf), 2210 "Register stack overflow, addr:%p, stack_base:%p\n", 2211 addr, thread->stack_base() ); 2212 tty->print_raw_cr(buf); 2213 // If not in java code, return and hope for the best. 2214 return in_java ? Handle_Exception(exceptionInfo, 2215 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2216 : EXCEPTION_CONTINUE_EXECUTION; 2217 } 2218 #endif 2219 if (thread->stack_yellow_zone_enabled()) { 2220 // Yellow zone violation. The o/s has unprotected the first yellow 2221 // zone page for us. Note: must call disable_stack_yellow_zone to 2222 // update the enabled status, even if the zone contains only one page. 2223 thread->disable_stack_yellow_zone(); 2224 // If not in java code, return and hope for the best. 2225 return in_java ? Handle_Exception(exceptionInfo, 2226 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2227 : EXCEPTION_CONTINUE_EXECUTION; 2228 } else { 2229 // Fatal red zone violation. 2230 thread->disable_stack_red_zone(); 2231 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2232 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2233 exceptionInfo->ContextRecord); 2234 return EXCEPTION_CONTINUE_SEARCH; 2235 } 2236 } else if (in_java) { 2237 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2238 // a one-time-only guard page, which it has released to us. The next 2239 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2240 return Handle_Exception(exceptionInfo, 2241 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2242 } else { 2243 // Can only return and hope for the best. Further stack growth will 2244 // result in an ACCESS_VIOLATION. 2245 return EXCEPTION_CONTINUE_EXECUTION; 2246 } 2247 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2248 // Either stack overflow or null pointer exception. 2249 if (in_java) { 2250 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2251 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2252 address stack_end = thread->stack_base() - thread->stack_size(); 2253 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2254 // Stack overflow. 2255 assert(!os::uses_stack_guard_pages(), 2256 "should be caught by red zone code above."); 2257 return Handle_Exception(exceptionInfo, 2258 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2259 } 2260 // 2261 // Check for safepoint polling and implicit null 2262 // We only expect null pointers in the stubs (vtable) 2263 // the rest are checked explicitly now. 2264 // 2265 CodeBlob* cb = CodeCache::find_blob(pc); 2266 if (cb != NULL) { 2267 if (os::is_poll_address(addr)) { 2268 address stub = SharedRuntime::get_poll_stub(pc); 2269 return Handle_Exception(exceptionInfo, stub); 2270 } 2271 } 2272 { 2273 #ifdef _WIN64 2274 // 2275 // If it's a legal stack address map the entire region in 2276 // 2277 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2278 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2279 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) { 2280 addr = (address)((uintptr_t)addr & 2281 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2282 os::commit_memory((char *)addr, thread->stack_base() - addr, 2283 false ); 2284 return EXCEPTION_CONTINUE_EXECUTION; 2285 } 2286 else 2287 #endif 2288 { 2289 // Null pointer exception. 2290 #ifdef _M_IA64 2291 // We catch register stack overflows in compiled code by doing 2292 // an explicit compare and executing a st8(G0, G0) if the 2293 // BSP enters into our guard area. We test for the overflow 2294 // condition and fall into the normal null pointer exception 2295 // code if BSP hasn't overflowed. 2296 if ( in_java ) { 2297 if(thread->register_stack_overflow()) { 2298 assert((address)exceptionInfo->ContextRecord->IntS3 == 2299 thread->register_stack_limit(), 2300 "GR7 doesn't contain register_stack_limit"); 2301 // Disable the yellow zone which sets the state that 2302 // we've got a stack overflow problem. 2303 if (thread->stack_yellow_zone_enabled()) { 2304 thread->disable_stack_yellow_zone(); 2305 } 2306 // Give us some room to process the exception 2307 thread->disable_register_stack_guard(); 2308 // Update GR7 with the new limit so we can continue running 2309 // compiled code. 2310 exceptionInfo->ContextRecord->IntS3 = 2311 (ULONGLONG)thread->register_stack_limit(); 2312 return Handle_Exception(exceptionInfo, 2313 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2314 } else { 2315 // 2316 // Check for implicit null 2317 // We only expect null pointers in the stubs (vtable) 2318 // the rest are checked explicitly now. 2319 // 2320 if (((uintptr_t)addr) < os::vm_page_size() ) { 2321 // an access to the first page of VM--assume it is a null pointer 2322 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2323 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2324 } 2325 } 2326 } // in_java 2327 2328 // IA64 doesn't use implicit null checking yet. So we shouldn't 2329 // get here. 2330 tty->print_raw_cr("Access violation, possible null pointer exception"); 2331 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2332 exceptionInfo->ContextRecord); 2333 return EXCEPTION_CONTINUE_SEARCH; 2334 #else /* !IA64 */ 2335 2336 // Windows 98 reports faulting addresses incorrectly 2337 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2338 !os::win32::is_nt()) { 2339 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2340 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2341 } 2342 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2343 exceptionInfo->ContextRecord); 2344 return EXCEPTION_CONTINUE_SEARCH; 2345 #endif 2346 } 2347 } 2348 } 2349 2350 #ifdef _WIN64 2351 // Special care for fast JNI field accessors. 2352 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2353 // in and the heap gets shrunk before the field access. 2354 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2355 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2356 if (addr != (address)-1) { 2357 return Handle_Exception(exceptionInfo, addr); 2358 } 2359 } 2360 #endif 2361 2362 #ifdef _WIN64 2363 // Windows will sometimes generate an access violation 2364 // when we call malloc. Since we use VectoredExceptions 2365 // on 64 bit platforms, we see this exception. We must 2366 // pass this exception on so Windows can recover. 2367 // We check to see if the pc of the fault is in NTDLL.DLL 2368 // if so, we pass control on to Windows for handling. 2369 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH; 2370 #endif 2371 2372 // Stack overflow or null pointer exception in native code. 2373 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2374 exceptionInfo->ContextRecord); 2375 return EXCEPTION_CONTINUE_SEARCH; 2376 } 2377 2378 if (in_java) { 2379 switch (exception_code) { 2380 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2381 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2382 2383 case EXCEPTION_INT_OVERFLOW: 2384 return Handle_IDiv_Exception(exceptionInfo); 2385 2386 } // switch 2387 } 2388 #ifndef _WIN64 2389 if ((thread->thread_state() == _thread_in_Java) || 2390 (thread->thread_state() == _thread_in_native) ) 2391 { 2392 LONG result=Handle_FLT_Exception(exceptionInfo); 2393 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2394 } 2395 #endif //_WIN64 2396 } 2397 2398 if (exception_code != EXCEPTION_BREAKPOINT) { 2399 #ifndef _WIN64 2400 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2401 exceptionInfo->ContextRecord); 2402 #else 2403 // Itanium Windows uses a VectoredExceptionHandler 2404 // Which means that C++ programatic exception handlers (try/except) 2405 // will get here. Continue the search for the right except block if 2406 // the exception code is not a fatal code. 2407 switch ( exception_code ) { 2408 case EXCEPTION_ACCESS_VIOLATION: 2409 case EXCEPTION_STACK_OVERFLOW: 2410 case EXCEPTION_ILLEGAL_INSTRUCTION: 2411 case EXCEPTION_ILLEGAL_INSTRUCTION_2: 2412 case EXCEPTION_INT_OVERFLOW: 2413 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2414 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2415 exceptionInfo->ContextRecord); 2416 } 2417 break; 2418 default: 2419 break; 2420 } 2421 #endif 2422 } 2423 return EXCEPTION_CONTINUE_SEARCH; 2424 } 2425 2426 #ifndef _WIN64 2427 // Special care for fast JNI accessors. 2428 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2429 // the heap gets shrunk before the field access. 2430 // Need to install our own structured exception handler since native code may 2431 // install its own. 2432 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2433 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2434 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2435 address pc = (address) exceptionInfo->ContextRecord->Eip; 2436 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2437 if (addr != (address)-1) { 2438 return Handle_Exception(exceptionInfo, addr); 2439 } 2440 } 2441 return EXCEPTION_CONTINUE_SEARCH; 2442 } 2443 2444 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \ 2445 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \ 2446 __try { \ 2447 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \ 2448 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \ 2449 } \ 2450 return 0; \ 2451 } 2452 2453 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2454 DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2455 DEFINE_FAST_GETFIELD(jchar, char, Char) 2456 DEFINE_FAST_GETFIELD(jshort, short, Short) 2457 DEFINE_FAST_GETFIELD(jint, int, Int) 2458 DEFINE_FAST_GETFIELD(jlong, long, Long) 2459 DEFINE_FAST_GETFIELD(jfloat, float, Float) 2460 DEFINE_FAST_GETFIELD(jdouble, double, Double) 2461 2462 address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2463 switch (type) { 2464 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2465 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2466 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2467 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2468 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2469 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2470 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2471 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2472 default: ShouldNotReachHere(); 2473 } 2474 return (address)-1; 2475 } 2476 #endif 2477 2478 // Virtual Memory 2479 2480 int os::vm_page_size() { return os::win32::vm_page_size(); } 2481 int os::vm_allocation_granularity() { 2482 return os::win32::vm_allocation_granularity(); 2483 } 2484 2485 // Windows large page support is available on Windows 2003. In order to use 2486 // large page memory, the administrator must first assign additional privilege 2487 // to the user: 2488 // + select Control Panel -> Administrative Tools -> Local Security Policy 2489 // + select Local Policies -> User Rights Assignment 2490 // + double click "Lock pages in memory", add users and/or groups 2491 // + reboot 2492 // Note the above steps are needed for administrator as well, as administrators 2493 // by default do not have the privilege to lock pages in memory. 2494 // 2495 // Note about Windows 2003: although the API supports committing large page 2496 // memory on a page-by-page basis and VirtualAlloc() returns success under this 2497 // scenario, I found through experiment it only uses large page if the entire 2498 // memory region is reserved and committed in a single VirtualAlloc() call. 2499 // This makes Windows large page support more or less like Solaris ISM, in 2500 // that the entire heap must be committed upfront. This probably will change 2501 // in the future, if so the code below needs to be revisited. 2502 2503 #ifndef MEM_LARGE_PAGES 2504 #define MEM_LARGE_PAGES 0x20000000 2505 #endif 2506 2507 // GetLargePageMinimum is only available on Windows 2003. The other functions 2508 // are available on NT but not on Windows 98/Me. We have to resolve them at 2509 // runtime. 2510 typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void); 2511 typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type) 2512 (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 2513 typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE); 2514 typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID); 2515 2516 static GetLargePageMinimum_func_type _GetLargePageMinimum; 2517 static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges; 2518 static OpenProcessToken_func_type _OpenProcessToken; 2519 static LookupPrivilegeValue_func_type _LookupPrivilegeValue; 2520 2521 static HINSTANCE _kernel32; 2522 static HINSTANCE _advapi32; 2523 static HANDLE _hProcess; 2524 static HANDLE _hToken; 2525 2526 static size_t _large_page_size = 0; 2527 2528 static bool resolve_functions_for_large_page_init() { 2529 _kernel32 = LoadLibrary("kernel32.dll"); 2530 if (_kernel32 == NULL) return false; 2531 2532 _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type, 2533 GetProcAddress(_kernel32, "GetLargePageMinimum")); 2534 if (_GetLargePageMinimum == NULL) return false; 2535 2536 _advapi32 = LoadLibrary("advapi32.dll"); 2537 if (_advapi32 == NULL) return false; 2538 2539 _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type, 2540 GetProcAddress(_advapi32, "AdjustTokenPrivileges")); 2541 _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type, 2542 GetProcAddress(_advapi32, "OpenProcessToken")); 2543 _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type, 2544 GetProcAddress(_advapi32, "LookupPrivilegeValueA")); 2545 return _AdjustTokenPrivileges != NULL && 2546 _OpenProcessToken != NULL && 2547 _LookupPrivilegeValue != NULL; 2548 } 2549 2550 static bool request_lock_memory_privilege() { 2551 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2552 os::current_process_id()); 2553 2554 LUID luid; 2555 if (_hProcess != NULL && 2556 _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2557 _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2558 2559 TOKEN_PRIVILEGES tp; 2560 tp.PrivilegeCount = 1; 2561 tp.Privileges[0].Luid = luid; 2562 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2563 2564 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2565 // privilege. Check GetLastError() too. See MSDN document. 2566 if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2567 (GetLastError() == ERROR_SUCCESS)) { 2568 return true; 2569 } 2570 } 2571 2572 return false; 2573 } 2574 2575 static void cleanup_after_large_page_init() { 2576 _GetLargePageMinimum = NULL; 2577 _AdjustTokenPrivileges = NULL; 2578 _OpenProcessToken = NULL; 2579 _LookupPrivilegeValue = NULL; 2580 if (_kernel32) FreeLibrary(_kernel32); 2581 _kernel32 = NULL; 2582 if (_advapi32) FreeLibrary(_advapi32); 2583 _advapi32 = NULL; 2584 if (_hProcess) CloseHandle(_hProcess); 2585 _hProcess = NULL; 2586 if (_hToken) CloseHandle(_hToken); 2587 _hToken = NULL; 2588 } 2589 2590 bool os::large_page_init() { 2591 if (!UseLargePages) return false; 2592 2593 // print a warning if any large page related flag is specified on command line 2594 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2595 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2596 bool success = false; 2597 2598 # define WARN(msg) if (warn_on_failure) { warning(msg); } 2599 if (resolve_functions_for_large_page_init()) { 2600 if (request_lock_memory_privilege()) { 2601 size_t s = _GetLargePageMinimum(); 2602 if (s) { 2603 #if defined(IA32) || defined(AMD64) 2604 if (s > 4*M || LargePageSizeInBytes > 4*M) { 2605 WARN("JVM cannot use large pages bigger than 4mb."); 2606 } else { 2607 #endif 2608 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 2609 _large_page_size = LargePageSizeInBytes; 2610 } else { 2611 _large_page_size = s; 2612 } 2613 success = true; 2614 #if defined(IA32) || defined(AMD64) 2615 } 2616 #endif 2617 } else { 2618 WARN("Large page is not supported by the processor."); 2619 } 2620 } else { 2621 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 2622 } 2623 } else { 2624 WARN("Large page is not supported by the operating system."); 2625 } 2626 #undef WARN 2627 2628 const size_t default_page_size = (size_t) vm_page_size(); 2629 if (success && _large_page_size > default_page_size) { 2630 _page_sizes[0] = _large_page_size; 2631 _page_sizes[1] = default_page_size; 2632 _page_sizes[2] = 0; 2633 } 2634 2635 cleanup_after_large_page_init(); 2636 return success; 2637 } 2638 2639 // On win32, one cannot release just a part of reserved memory, it's an 2640 // all or nothing deal. When we split a reservation, we must break the 2641 // reservation into two reservations. 2642 void os::split_reserved_memory(char *base, size_t size, size_t split, 2643 bool realloc) { 2644 if (size > 0) { 2645 release_memory(base, size); 2646 if (realloc) { 2647 reserve_memory(split, base); 2648 } 2649 if (size != split) { 2650 reserve_memory(size - split, base + split); 2651 } 2652 } 2653 } 2654 2655 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 2656 assert((size_t)addr % os::vm_allocation_granularity() == 0, 2657 "reserve alignment"); 2658 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size"); 2659 char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 2660 assert(res == NULL || addr == NULL || addr == res, 2661 "Unexpected address from reserve."); 2662 return res; 2663 } 2664 2665 // Reserve memory at an arbitrary address, only if that area is 2666 // available (and not reserved for something else). 2667 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2668 // Windows os::reserve_memory() fails of the requested address range is 2669 // not avilable. 2670 return reserve_memory(bytes, requested_addr); 2671 } 2672 2673 size_t os::large_page_size() { 2674 return _large_page_size; 2675 } 2676 2677 bool os::can_commit_large_page_memory() { 2678 // Windows only uses large page memory when the entire region is reserved 2679 // and committed in a single VirtualAlloc() call. This may change in the 2680 // future, but with Windows 2003 it's not possible to commit on demand. 2681 return false; 2682 } 2683 2684 bool os::can_execute_large_page_memory() { 2685 return true; 2686 } 2687 2688 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) { 2689 2690 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 2691 2692 if (UseLargePagesIndividualAllocation) { 2693 if (TracePageSizes && Verbose) { 2694 tty->print_cr("Reserving large pages individually."); 2695 } 2696 char * p_buf; 2697 // first reserve enough address space in advance since we want to be 2698 // able to break a single contiguous virtual address range into multiple 2699 // large page commits but WS2003 does not allow reserving large page space 2700 // so we just use 4K pages for reserve, this gives us a legal contiguous 2701 // address space. then we will deallocate that reservation, and re alloc 2702 // using large pages 2703 const size_t size_of_reserve = bytes + _large_page_size; 2704 if (bytes > size_of_reserve) { 2705 // Overflowed. 2706 warning("Individually allocated large pages failed, " 2707 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 2708 return NULL; 2709 } 2710 p_buf = (char *) VirtualAlloc(addr, 2711 size_of_reserve, // size of Reserve 2712 MEM_RESERVE, 2713 PAGE_READWRITE); 2714 // If reservation failed, return NULL 2715 if (p_buf == NULL) return NULL; 2716 2717 release_memory(p_buf, bytes + _large_page_size); 2718 // round up to page boundary. If the size_of_reserve did not 2719 // overflow and the reservation did not fail, this align up 2720 // should not overflow. 2721 p_buf = (char *) align_size_up((size_t)p_buf, _large_page_size); 2722 2723 // now go through and allocate one page at a time until all bytes are 2724 // allocated 2725 size_t bytes_remaining = align_size_up(bytes, _large_page_size); 2726 // An overflow of align_size_up() would have been caught above 2727 // in the calculation of size_of_reserve. 2728 char * next_alloc_addr = p_buf; 2729 2730 #ifdef ASSERT 2731 // Variable for the failure injection 2732 long ran_num = os::random(); 2733 size_t fail_after = ran_num % bytes; 2734 #endif 2735 2736 while (bytes_remaining) { 2737 size_t bytes_to_rq = MIN2(bytes_remaining, _large_page_size); 2738 // Note allocate and commit 2739 char * p_new; 2740 2741 #ifdef ASSERT 2742 bool inject_error = LargePagesIndividualAllocationInjectError && 2743 (bytes_remaining <= fail_after); 2744 #else 2745 const bool inject_error = false; 2746 #endif 2747 2748 if (inject_error) { 2749 p_new = NULL; 2750 } else { 2751 p_new = (char *) VirtualAlloc(next_alloc_addr, 2752 bytes_to_rq, 2753 MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES, 2754 prot); 2755 } 2756 2757 if (p_new == NULL) { 2758 // Free any allocated pages 2759 if (next_alloc_addr > p_buf) { 2760 // Some memory was committed so release it. 2761 size_t bytes_to_release = bytes - bytes_remaining; 2762 release_memory(p_buf, bytes_to_release); 2763 } 2764 #ifdef ASSERT 2765 if (UseLargePagesIndividualAllocation && 2766 LargePagesIndividualAllocationInjectError) { 2767 if (TracePageSizes && Verbose) { 2768 tty->print_cr("Reserving large pages individually failed."); 2769 } 2770 } 2771 #endif 2772 return NULL; 2773 } 2774 bytes_remaining -= bytes_to_rq; 2775 next_alloc_addr += bytes_to_rq; 2776 } 2777 2778 return p_buf; 2779 2780 } else { 2781 // normal policy just allocate it all at once 2782 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 2783 char * res = (char *)VirtualAlloc(NULL, bytes, flag, prot); 2784 return res; 2785 } 2786 } 2787 2788 bool os::release_memory_special(char* base, size_t bytes) { 2789 return release_memory(base, bytes); 2790 } 2791 2792 void os::print_statistics() { 2793 } 2794 2795 bool os::commit_memory(char* addr, size_t bytes, bool exec) { 2796 if (bytes == 0) { 2797 // Don't bother the OS with noops. 2798 return true; 2799 } 2800 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 2801 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 2802 // Don't attempt to print anything if the OS call fails. We're 2803 // probably low on resources, so the print itself may cause crashes. 2804 bool result = VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) != 0; 2805 if (result != NULL && exec) { 2806 DWORD oldprot; 2807 // Windows doc says to use VirtualProtect to get execute permissions 2808 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot) != 0; 2809 } else { 2810 return result; 2811 } 2812 } 2813 2814 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint, 2815 bool exec) { 2816 return commit_memory(addr, size, exec); 2817 } 2818 2819 bool os::uncommit_memory(char* addr, size_t bytes) { 2820 if (bytes == 0) { 2821 // Don't bother the OS with noops. 2822 return true; 2823 } 2824 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 2825 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 2826 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0; 2827 } 2828 2829 bool os::release_memory(char* addr, size_t bytes) { 2830 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 2831 } 2832 2833 bool os::create_stack_guard_pages(char* addr, size_t size) { 2834 return os::commit_memory(addr, size); 2835 } 2836 2837 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2838 return os::uncommit_memory(addr, size); 2839 } 2840 2841 // Set protections specified 2842 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2843 bool is_committed) { 2844 unsigned int p = 0; 2845 switch (prot) { 2846 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 2847 case MEM_PROT_READ: p = PAGE_READONLY; break; 2848 case MEM_PROT_RW: p = PAGE_READWRITE; break; 2849 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 2850 default: 2851 ShouldNotReachHere(); 2852 } 2853 2854 DWORD old_status; 2855 2856 // Strange enough, but on Win32 one can change protection only for committed 2857 // memory, not a big deal anyway, as bytes less or equal than 64K 2858 if (!is_committed && !commit_memory(addr, bytes, prot == MEM_PROT_RWX)) { 2859 fatal("cannot commit protection page"); 2860 } 2861 // One cannot use os::guard_memory() here, as on Win32 guard page 2862 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 2863 // 2864 // Pages in the region become guard pages. Any attempt to access a guard page 2865 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 2866 // the guard page status. Guard pages thus act as a one-time access alarm. 2867 return VirtualProtect(addr, bytes, p, &old_status) != 0; 2868 } 2869 2870 bool os::guard_memory(char* addr, size_t bytes) { 2871 DWORD old_status; 2872 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 2873 } 2874 2875 bool os::unguard_memory(char* addr, size_t bytes) { 2876 DWORD old_status; 2877 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 2878 } 2879 2880 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 2881 void os::free_memory(char *addr, size_t bytes) { } 2882 void os::numa_make_global(char *addr, size_t bytes) { } 2883 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 2884 bool os::numa_topology_changed() { return false; } 2885 size_t os::numa_get_groups_num() { return 1; } 2886 int os::numa_get_group_id() { return 0; } 2887 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2888 if (size > 0) { 2889 ids[0] = 0; 2890 return 1; 2891 } 2892 return 0; 2893 } 2894 2895 bool os::get_page_info(char *start, page_info* info) { 2896 return false; 2897 } 2898 2899 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2900 return end; 2901 } 2902 2903 char* os::non_memory_address_word() { 2904 // Must never look like an address returned by reserve_memory, 2905 // even in its subfields (as defined by the CPU immediate fields, 2906 // if the CPU splits constants across multiple instructions). 2907 return (char*)-1; 2908 } 2909 2910 #define MAX_ERROR_COUNT 100 2911 #define SYS_THREAD_ERROR 0xffffffffUL 2912 2913 void os::pd_start_thread(Thread* thread) { 2914 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 2915 // Returns previous suspend state: 2916 // 0: Thread was not suspended 2917 // 1: Thread is running now 2918 // >1: Thread is still suspended. 2919 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 2920 } 2921 2922 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2923 return ::read(fd, buf, nBytes); 2924 } 2925 2926 class HighResolutionInterval { 2927 // The default timer resolution seems to be 10 milliseconds. 2928 // (Where is this written down?) 2929 // If someone wants to sleep for only a fraction of the default, 2930 // then we set the timer resolution down to 1 millisecond for 2931 // the duration of their interval. 2932 // We carefully set the resolution back, since otherwise we 2933 // seem to incur an overhead (3%?) that we don't need. 2934 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 2935 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 2936 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 2937 // timeBeginPeriod() if the relative error exceeded some threshold. 2938 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 2939 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 2940 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 2941 // resolution timers running. 2942 private: 2943 jlong resolution; 2944 public: 2945 HighResolutionInterval(jlong ms) { 2946 resolution = ms % 10L; 2947 if (resolution != 0) { 2948 MMRESULT result = timeBeginPeriod(1L); 2949 } 2950 } 2951 ~HighResolutionInterval() { 2952 if (resolution != 0) { 2953 MMRESULT result = timeEndPeriod(1L); 2954 } 2955 resolution = 0L; 2956 } 2957 }; 2958 2959 int os::sleep(Thread* thread, jlong ms, bool interruptable) { 2960 jlong limit = (jlong) MAXDWORD; 2961 2962 while(ms > limit) { 2963 int res; 2964 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) 2965 return res; 2966 ms -= limit; 2967 } 2968 2969 assert(thread == Thread::current(), "thread consistency check"); 2970 OSThread* osthread = thread->osthread(); 2971 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 2972 int result; 2973 if (interruptable) { 2974 assert(thread->is_Java_thread(), "must be java thread"); 2975 JavaThread *jt = (JavaThread *) thread; 2976 ThreadBlockInVM tbivm(jt); 2977 2978 jt->set_suspend_equivalent(); 2979 // cleared by handle_special_suspend_equivalent_condition() or 2980 // java_suspend_self() via check_and_wait_while_suspended() 2981 2982 HANDLE events[1]; 2983 events[0] = osthread->interrupt_event(); 2984 HighResolutionInterval *phri=NULL; 2985 if(!ForceTimeHighResolution) 2986 phri = new HighResolutionInterval( ms ); 2987 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 2988 result = OS_TIMEOUT; 2989 } else { 2990 ResetEvent(osthread->interrupt_event()); 2991 osthread->set_interrupted(false); 2992 result = OS_INTRPT; 2993 } 2994 delete phri; //if it is NULL, harmless 2995 2996 // were we externally suspended while we were waiting? 2997 jt->check_and_wait_while_suspended(); 2998 } else { 2999 assert(!thread->is_Java_thread(), "must not be java thread"); 3000 Sleep((long) ms); 3001 result = OS_TIMEOUT; 3002 } 3003 return result; 3004 } 3005 3006 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3007 void os::infinite_sleep() { 3008 while (true) { // sleep forever ... 3009 Sleep(100000); // ... 100 seconds at a time 3010 } 3011 } 3012 3013 typedef BOOL (WINAPI * STTSignature)(void) ; 3014 3015 os::YieldResult os::NakedYield() { 3016 // Use either SwitchToThread() or Sleep(0) 3017 // Consider passing back the return value from SwitchToThread(). 3018 // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread. 3019 // In that case we revert to Sleep(0). 3020 static volatile STTSignature stt = (STTSignature) 1 ; 3021 3022 if (stt == ((STTSignature) 1)) { 3023 stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ; 3024 // It's OK if threads race during initialization as the operation above is idempotent. 3025 } 3026 if (stt != NULL) { 3027 return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ; 3028 } else { 3029 Sleep (0) ; 3030 } 3031 return os::YIELD_UNKNOWN ; 3032 } 3033 3034 void os::yield() { os::NakedYield(); } 3035 3036 void os::yield_all(int attempts) { 3037 // Yields to all threads, including threads with lower priorities 3038 Sleep(1); 3039 } 3040 3041 // Win32 only gives you access to seven real priorities at a time, 3042 // so we compress Java's ten down to seven. It would be better 3043 // if we dynamically adjusted relative priorities. 3044 3045 int os::java_to_os_priority[MaxPriority + 1] = { 3046 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3047 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3048 THREAD_PRIORITY_LOWEST, // 2 3049 THREAD_PRIORITY_BELOW_NORMAL, // 3 3050 THREAD_PRIORITY_BELOW_NORMAL, // 4 3051 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3052 THREAD_PRIORITY_NORMAL, // 6 3053 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3054 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3055 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3056 THREAD_PRIORITY_HIGHEST // 10 MaxPriority 3057 }; 3058 3059 int prio_policy1[MaxPriority + 1] = { 3060 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3061 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3062 THREAD_PRIORITY_LOWEST, // 2 3063 THREAD_PRIORITY_BELOW_NORMAL, // 3 3064 THREAD_PRIORITY_BELOW_NORMAL, // 4 3065 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3066 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3067 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3068 THREAD_PRIORITY_HIGHEST, // 8 3069 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3070 THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority 3071 }; 3072 3073 static int prio_init() { 3074 // If ThreadPriorityPolicy is 1, switch tables 3075 if (ThreadPriorityPolicy == 1) { 3076 int i; 3077 for (i = 0; i < MaxPriority + 1; i++) { 3078 os::java_to_os_priority[i] = prio_policy1[i]; 3079 } 3080 } 3081 return 0; 3082 } 3083 3084 OSReturn os::set_native_priority(Thread* thread, int priority) { 3085 if (!UseThreadPriorities) return OS_OK; 3086 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3087 return ret ? OS_OK : OS_ERR; 3088 } 3089 3090 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) { 3091 if ( !UseThreadPriorities ) { 3092 *priority_ptr = java_to_os_priority[NormPriority]; 3093 return OS_OK; 3094 } 3095 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3096 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3097 assert(false, "GetThreadPriority failed"); 3098 return OS_ERR; 3099 } 3100 *priority_ptr = os_prio; 3101 return OS_OK; 3102 } 3103 3104 3105 // Hint to the underlying OS that a task switch would not be good. 3106 // Void return because it's a hint and can fail. 3107 void os::hint_no_preempt() {} 3108 3109 void os::interrupt(Thread* thread) { 3110 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3111 "possibility of dangling Thread pointer"); 3112 3113 OSThread* osthread = thread->osthread(); 3114 osthread->set_interrupted(true); 3115 // More than one thread can get here with the same value of osthread, 3116 // resulting in multiple notifications. We do, however, want the store 3117 // to interrupted() to be visible to other threads before we post 3118 // the interrupt event. 3119 OrderAccess::release(); 3120 SetEvent(osthread->interrupt_event()); 3121 // For JSR166: unpark after setting status 3122 if (thread->is_Java_thread()) 3123 ((JavaThread*)thread)->parker()->unpark(); 3124 3125 ParkEvent * ev = thread->_ParkEvent ; 3126 if (ev != NULL) ev->unpark() ; 3127 3128 } 3129 3130 3131 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3132 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3133 "possibility of dangling Thread pointer"); 3134 3135 OSThread* osthread = thread->osthread(); 3136 bool interrupted; 3137 interrupted = osthread->interrupted(); 3138 if (clear_interrupted == true) { 3139 osthread->set_interrupted(false); 3140 ResetEvent(osthread->interrupt_event()); 3141 } // Otherwise leave the interrupted state alone 3142 3143 return interrupted; 3144 } 3145 3146 // Get's a pc (hint) for a running thread. Currently used only for profiling. 3147 ExtendedPC os::get_thread_pc(Thread* thread) { 3148 CONTEXT context; 3149 context.ContextFlags = CONTEXT_CONTROL; 3150 HANDLE handle = thread->osthread()->thread_handle(); 3151 #ifdef _M_IA64 3152 assert(0, "Fix get_thread_pc"); 3153 return ExtendedPC(NULL); 3154 #else 3155 if (GetThreadContext(handle, &context)) { 3156 #ifdef _M_AMD64 3157 return ExtendedPC((address) context.Rip); 3158 #else 3159 return ExtendedPC((address) context.Eip); 3160 #endif 3161 } else { 3162 return ExtendedPC(NULL); 3163 } 3164 #endif 3165 } 3166 3167 // GetCurrentThreadId() returns DWORD 3168 intx os::current_thread_id() { return GetCurrentThreadId(); } 3169 3170 static int _initial_pid = 0; 3171 3172 int os::current_process_id() 3173 { 3174 return (_initial_pid ? _initial_pid : _getpid()); 3175 } 3176 3177 int os::win32::_vm_page_size = 0; 3178 int os::win32::_vm_allocation_granularity = 0; 3179 int os::win32::_processor_type = 0; 3180 // Processor level is not available on non-NT systems, use vm_version instead 3181 int os::win32::_processor_level = 0; 3182 julong os::win32::_physical_memory = 0; 3183 size_t os::win32::_default_stack_size = 0; 3184 3185 intx os::win32::_os_thread_limit = 0; 3186 volatile intx os::win32::_os_thread_count = 0; 3187 3188 bool os::win32::_is_nt = false; 3189 bool os::win32::_is_windows_2003 = false; 3190 3191 3192 void os::win32::initialize_system_info() { 3193 SYSTEM_INFO si; 3194 GetSystemInfo(&si); 3195 _vm_page_size = si.dwPageSize; 3196 _vm_allocation_granularity = si.dwAllocationGranularity; 3197 _processor_type = si.dwProcessorType; 3198 _processor_level = si.wProcessorLevel; 3199 set_processor_count(si.dwNumberOfProcessors); 3200 3201 MEMORYSTATUSEX ms; 3202 ms.dwLength = sizeof(ms); 3203 3204 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3205 // dwMemoryLoad (% of memory in use) 3206 GlobalMemoryStatusEx(&ms); 3207 _physical_memory = ms.ullTotalPhys; 3208 3209 OSVERSIONINFO oi; 3210 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); 3211 GetVersionEx(&oi); 3212 switch(oi.dwPlatformId) { 3213 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 3214 case VER_PLATFORM_WIN32_NT: 3215 _is_nt = true; 3216 { 3217 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3218 if (os_vers == 5002) { 3219 _is_windows_2003 = true; 3220 } 3221 } 3222 break; 3223 default: fatal("Unknown platform"); 3224 } 3225 3226 _default_stack_size = os::current_stack_size(); 3227 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3228 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3229 "stack size not a multiple of page size"); 3230 3231 initialize_performance_counter(); 3232 3233 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is 3234 // known to deadlock the system, if the VM issues to thread operations with 3235 // a too high frequency, e.g., such as changing the priorities. 3236 // The 6000 seems to work well - no deadlocks has been notices on the test 3237 // programs that we have seen experience this problem. 3238 if (!os::win32::is_nt()) { 3239 StarvationMonitorInterval = 6000; 3240 } 3241 } 3242 3243 3244 void os::win32::setmode_streams() { 3245 _setmode(_fileno(stdin), _O_BINARY); 3246 _setmode(_fileno(stdout), _O_BINARY); 3247 _setmode(_fileno(stderr), _O_BINARY); 3248 } 3249 3250 3251 int os::message_box(const char* title, const char* message) { 3252 int result = MessageBox(NULL, message, title, 3253 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 3254 return result == IDYES; 3255 } 3256 3257 int os::allocate_thread_local_storage() { 3258 return TlsAlloc(); 3259 } 3260 3261 3262 void os::free_thread_local_storage(int index) { 3263 TlsFree(index); 3264 } 3265 3266 3267 void os::thread_local_storage_at_put(int index, void* value) { 3268 TlsSetValue(index, value); 3269 assert(thread_local_storage_at(index) == value, "Just checking"); 3270 } 3271 3272 3273 void* os::thread_local_storage_at(int index) { 3274 return TlsGetValue(index); 3275 } 3276 3277 3278 #ifndef PRODUCT 3279 #ifndef _WIN64 3280 // Helpers to check whether NX protection is enabled 3281 int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 3282 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 3283 pex->ExceptionRecord->NumberParameters > 0 && 3284 pex->ExceptionRecord->ExceptionInformation[0] == 3285 EXCEPTION_INFO_EXEC_VIOLATION) { 3286 return EXCEPTION_EXECUTE_HANDLER; 3287 } 3288 return EXCEPTION_CONTINUE_SEARCH; 3289 } 3290 3291 void nx_check_protection() { 3292 // If NX is enabled we'll get an exception calling into code on the stack 3293 char code[] = { (char)0xC3 }; // ret 3294 void *code_ptr = (void *)code; 3295 __try { 3296 __asm call code_ptr 3297 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 3298 tty->print_raw_cr("NX protection detected."); 3299 } 3300 } 3301 #endif // _WIN64 3302 #endif // PRODUCT 3303 3304 // this is called _before_ the global arguments have been parsed 3305 void os::init(void) { 3306 _initial_pid = _getpid(); 3307 3308 init_random(1234567); 3309 3310 win32::initialize_system_info(); 3311 win32::setmode_streams(); 3312 init_page_sizes((size_t) win32::vm_page_size()); 3313 3314 // For better scalability on MP systems (must be called after initialize_system_info) 3315 #ifndef PRODUCT 3316 if (is_MP()) { 3317 NoYieldsInMicrolock = true; 3318 } 3319 #endif 3320 // This may be overridden later when argument processing is done. 3321 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, 3322 os::win32::is_windows_2003()); 3323 3324 // Initialize main_process and main_thread 3325 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 3326 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 3327 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 3328 fatal("DuplicateHandle failed\n"); 3329 } 3330 main_thread_id = (int) GetCurrentThreadId(); 3331 } 3332 3333 // To install functions for atexit processing 3334 extern "C" { 3335 static void perfMemory_exit_helper() { 3336 perfMemory_exit(); 3337 } 3338 } 3339 3340 3341 // this is called _after_ the global arguments have been parsed 3342 jint os::init_2(void) { 3343 // Allocate a single page and mark it as readable for safepoint polling 3344 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 3345 guarantee( polling_page != NULL, "Reserve Failed for polling page"); 3346 3347 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 3348 guarantee( return_page != NULL, "Commit Failed for polling page"); 3349 3350 os::set_polling_page( polling_page ); 3351 3352 #ifndef PRODUCT 3353 if( Verbose && PrintMiscellaneous ) 3354 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 3355 #endif 3356 3357 if (!UseMembar) { 3358 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE); 3359 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 3360 3361 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE); 3362 guarantee( return_page != NULL, "Commit Failed for memory serialize page"); 3363 3364 os::set_memory_serialize_page( mem_serialize_page ); 3365 3366 #ifndef PRODUCT 3367 if(Verbose && PrintMiscellaneous) 3368 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3369 #endif 3370 } 3371 3372 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init()); 3373 3374 // Setup Windows Exceptions 3375 3376 // On Itanium systems, Structured Exception Handling does not 3377 // work since stack frames must be walkable by the OS. Since 3378 // much of our code is dynamically generated, and we do not have 3379 // proper unwind .xdata sections, the system simply exits 3380 // rather than delivering the exception. To work around 3381 // this we use VectorExceptions instead. 3382 #ifdef _WIN64 3383 if (UseVectoredExceptions) { 3384 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter); 3385 } 3386 #endif 3387 3388 // for debugging float code generation bugs 3389 if (ForceFloatExceptions) { 3390 #ifndef _WIN64 3391 static long fp_control_word = 0; 3392 __asm { fstcw fp_control_word } 3393 // see Intel PPro Manual, Vol. 2, p 7-16 3394 const long precision = 0x20; 3395 const long underflow = 0x10; 3396 const long overflow = 0x08; 3397 const long zero_div = 0x04; 3398 const long denorm = 0x02; 3399 const long invalid = 0x01; 3400 fp_control_word |= invalid; 3401 __asm { fldcw fp_control_word } 3402 #endif 3403 } 3404 3405 // Initialize HPI. 3406 jint hpi_result = hpi::initialize(); 3407 if (hpi_result != JNI_OK) { return hpi_result; } 3408 3409 // If stack_commit_size is 0, windows will reserve the default size, 3410 // but only commit a small portion of it. 3411 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 3412 size_t default_reserve_size = os::win32::default_stack_size(); 3413 size_t actual_reserve_size = stack_commit_size; 3414 if (stack_commit_size < default_reserve_size) { 3415 // If stack_commit_size == 0, we want this too 3416 actual_reserve_size = default_reserve_size; 3417 } 3418 3419 JavaThread::set_stack_size_at_create(stack_commit_size); 3420 3421 // Calculate theoretical max. size of Threads to guard gainst artifical 3422 // out-of-memory situations, where all available address-space has been 3423 // reserved by thread stacks. 3424 assert(actual_reserve_size != 0, "Must have a stack"); 3425 3426 // Calculate the thread limit when we should start doing Virtual Memory 3427 // banging. Currently when the threads will have used all but 200Mb of space. 3428 // 3429 // TODO: consider performing a similar calculation for commit size instead 3430 // as reserve size, since on a 64-bit platform we'll run into that more 3431 // often than running out of virtual memory space. We can use the 3432 // lower value of the two calculations as the os_thread_limit. 3433 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 3434 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 3435 3436 // at exit methods are called in the reverse order of their registration. 3437 // there is no limit to the number of functions registered. atexit does 3438 // not set errno. 3439 3440 if (PerfAllowAtExitRegistration) { 3441 // only register atexit functions if PerfAllowAtExitRegistration is set. 3442 // atexit functions can be delayed until process exit time, which 3443 // can be problematic for embedded VM situations. Embedded VMs should 3444 // call DestroyJavaVM() to assure that VM resources are released. 3445 3446 // note: perfMemory_exit_helper atexit function may be removed in 3447 // the future if the appropriate cleanup code can be added to the 3448 // VM_Exit VMOperation's doit method. 3449 if (atexit(perfMemory_exit_helper) != 0) { 3450 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3451 } 3452 } 3453 3454 // initialize PSAPI or ToolHelp for fatal error handler 3455 if (win32::is_nt()) _init_psapi(); 3456 else _init_toolhelp(); 3457 3458 #ifndef _WIN64 3459 // Print something if NX is enabled (win32 on AMD64) 3460 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 3461 #endif 3462 3463 // initialize thread priority policy 3464 prio_init(); 3465 3466 if (UseNUMA && !ForceNUMA) { 3467 UseNUMA = false; // Currently unsupported. 3468 } 3469 3470 return JNI_OK; 3471 } 3472 3473 void os::init_3(void) { 3474 return; 3475 } 3476 3477 // Mark the polling page as unreadable 3478 void os::make_polling_page_unreadable(void) { 3479 DWORD old_status; 3480 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) ) 3481 fatal("Could not disable polling page"); 3482 }; 3483 3484 // Mark the polling page as readable 3485 void os::make_polling_page_readable(void) { 3486 DWORD old_status; 3487 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) ) 3488 fatal("Could not enable polling page"); 3489 }; 3490 3491 3492 int os::stat(const char *path, struct stat *sbuf) { 3493 char pathbuf[MAX_PATH]; 3494 if (strlen(path) > MAX_PATH - 1) { 3495 errno = ENAMETOOLONG; 3496 return -1; 3497 } 3498 hpi::native_path(strcpy(pathbuf, path)); 3499 int ret = ::stat(pathbuf, sbuf); 3500 if (sbuf != NULL && UseUTCFileTimestamp) { 3501 // Fix for 6539723. st_mtime returned from stat() is dependent on 3502 // the system timezone and so can return different values for the 3503 // same file if/when daylight savings time changes. This adjustment 3504 // makes sure the same timestamp is returned regardless of the TZ. 3505 // 3506 // See: 3507 // http://msdn.microsoft.com/library/ 3508 // default.asp?url=/library/en-us/sysinfo/base/ 3509 // time_zone_information_str.asp 3510 // and 3511 // http://msdn.microsoft.com/library/default.asp?url= 3512 // /library/en-us/sysinfo/base/settimezoneinformation.asp 3513 // 3514 // NOTE: there is a insidious bug here: If the timezone is changed 3515 // after the call to stat() but before 'GetTimeZoneInformation()', then 3516 // the adjustment we do here will be wrong and we'll return the wrong 3517 // value (which will likely end up creating an invalid class data 3518 // archive). Absent a better API for this, or some time zone locking 3519 // mechanism, we'll have to live with this risk. 3520 TIME_ZONE_INFORMATION tz; 3521 DWORD tzid = GetTimeZoneInformation(&tz); 3522 int daylightBias = 3523 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 3524 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 3525 } 3526 return ret; 3527 } 3528 3529 3530 #define FT2INT64(ft) \ 3531 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 3532 3533 3534 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3535 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3536 // of a thread. 3537 // 3538 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3539 // the fast estimate available on the platform. 3540 3541 // current_thread_cpu_time() is not optimized for Windows yet 3542 jlong os::current_thread_cpu_time() { 3543 // return user + sys since the cost is the same 3544 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 3545 } 3546 3547 jlong os::thread_cpu_time(Thread* thread) { 3548 // consistent with what current_thread_cpu_time() returns. 3549 return os::thread_cpu_time(thread, true /* user+sys */); 3550 } 3551 3552 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3553 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3554 } 3555 3556 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 3557 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 3558 // If this function changes, os::is_thread_cpu_time_supported() should too 3559 if (os::win32::is_nt()) { 3560 FILETIME CreationTime; 3561 FILETIME ExitTime; 3562 FILETIME KernelTime; 3563 FILETIME UserTime; 3564 3565 if ( GetThreadTimes(thread->osthread()->thread_handle(), 3566 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 3567 return -1; 3568 else 3569 if (user_sys_cpu_time) { 3570 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 3571 } else { 3572 return FT2INT64(UserTime) * 100; 3573 } 3574 } else { 3575 return (jlong) timeGetTime() * 1000000; 3576 } 3577 } 3578 3579 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3580 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 3581 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 3582 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 3583 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3584 } 3585 3586 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3587 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 3588 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 3589 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 3590 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3591 } 3592 3593 bool os::is_thread_cpu_time_supported() { 3594 // see os::thread_cpu_time 3595 if (os::win32::is_nt()) { 3596 FILETIME CreationTime; 3597 FILETIME ExitTime; 3598 FILETIME KernelTime; 3599 FILETIME UserTime; 3600 3601 if ( GetThreadTimes(GetCurrentThread(), 3602 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 3603 return false; 3604 else 3605 return true; 3606 } else { 3607 return false; 3608 } 3609 } 3610 3611 // Windows does't provide a loadavg primitive so this is stubbed out for now. 3612 // It does have primitives (PDH API) to get CPU usage and run queue length. 3613 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 3614 // If we wanted to implement loadavg on Windows, we have a few options: 3615 // 3616 // a) Query CPU usage and run queue length and "fake" an answer by 3617 // returning the CPU usage if it's under 100%, and the run queue 3618 // length otherwise. It turns out that querying is pretty slow 3619 // on Windows, on the order of 200 microseconds on a fast machine. 3620 // Note that on the Windows the CPU usage value is the % usage 3621 // since the last time the API was called (and the first call 3622 // returns 100%), so we'd have to deal with that as well. 3623 // 3624 // b) Sample the "fake" answer using a sampling thread and store 3625 // the answer in a global variable. The call to loadavg would 3626 // just return the value of the global, avoiding the slow query. 3627 // 3628 // c) Sample a better answer using exponential decay to smooth the 3629 // value. This is basically the algorithm used by UNIX kernels. 3630 // 3631 // Note that sampling thread starvation could affect both (b) and (c). 3632 int os::loadavg(double loadavg[], int nelem) { 3633 return -1; 3634 } 3635 3636 3637 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 3638 bool os::dont_yield() { 3639 return DontYieldALot; 3640 } 3641 3642 // Is a (classpath) directory empty? 3643 bool os::dir_is_empty(const char* path) { 3644 WIN32_FIND_DATA fd; 3645 HANDLE f = FindFirstFile(path, &fd); 3646 if (f == INVALID_HANDLE_VALUE) { 3647 return true; 3648 } 3649 FindClose(f); 3650 return false; 3651 } 3652 3653 // create binary file, rewriting existing file if required 3654 int os::create_binary_file(const char* path, bool rewrite_existing) { 3655 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 3656 if (!rewrite_existing) { 3657 oflags |= _O_EXCL; 3658 } 3659 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 3660 } 3661 3662 // return current position of file pointer 3663 jlong os::current_file_offset(int fd) { 3664 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 3665 } 3666 3667 // move file pointer to the specified offset 3668 jlong os::seek_to_file_offset(int fd, jlong offset) { 3669 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 3670 } 3671 3672 3673 // Map a block of memory. 3674 char* os::map_memory(int fd, const char* file_name, size_t file_offset, 3675 char *addr, size_t bytes, bool read_only, 3676 bool allow_exec) { 3677 HANDLE hFile; 3678 char* base; 3679 3680 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 3681 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 3682 if (hFile == NULL) { 3683 if (PrintMiscellaneous && Verbose) { 3684 DWORD err = GetLastError(); 3685 tty->print_cr("CreateFile() failed: GetLastError->%ld."); 3686 } 3687 return NULL; 3688 } 3689 3690 if (allow_exec) { 3691 // CreateFileMapping/MapViewOfFileEx can't map executable memory 3692 // unless it comes from a PE image (which the shared archive is not.) 3693 // Even VirtualProtect refuses to give execute access to mapped memory 3694 // that was not previously executable. 3695 // 3696 // Instead, stick the executable region in anonymous memory. Yuck. 3697 // Penalty is that ~4 pages will not be shareable - in the future 3698 // we might consider DLLizing the shared archive with a proper PE 3699 // header so that mapping executable + sharing is possible. 3700 3701 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 3702 PAGE_READWRITE); 3703 if (base == NULL) { 3704 if (PrintMiscellaneous && Verbose) { 3705 DWORD err = GetLastError(); 3706 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 3707 } 3708 CloseHandle(hFile); 3709 return NULL; 3710 } 3711 3712 DWORD bytes_read; 3713 OVERLAPPED overlapped; 3714 overlapped.Offset = (DWORD)file_offset; 3715 overlapped.OffsetHigh = 0; 3716 overlapped.hEvent = NULL; 3717 // ReadFile guarantees that if the return value is true, the requested 3718 // number of bytes were read before returning. 3719 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 3720 if (!res) { 3721 if (PrintMiscellaneous && Verbose) { 3722 DWORD err = GetLastError(); 3723 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 3724 } 3725 release_memory(base, bytes); 3726 CloseHandle(hFile); 3727 return NULL; 3728 } 3729 } else { 3730 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 3731 NULL /*file_name*/); 3732 if (hMap == NULL) { 3733 if (PrintMiscellaneous && Verbose) { 3734 DWORD err = GetLastError(); 3735 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld."); 3736 } 3737 CloseHandle(hFile); 3738 return NULL; 3739 } 3740 3741 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 3742 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 3743 (DWORD)bytes, addr); 3744 if (base == NULL) { 3745 if (PrintMiscellaneous && Verbose) { 3746 DWORD err = GetLastError(); 3747 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 3748 } 3749 CloseHandle(hMap); 3750 CloseHandle(hFile); 3751 return NULL; 3752 } 3753 3754 if (CloseHandle(hMap) == 0) { 3755 if (PrintMiscellaneous && Verbose) { 3756 DWORD err = GetLastError(); 3757 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 3758 } 3759 CloseHandle(hFile); 3760 return base; 3761 } 3762 } 3763 3764 if (allow_exec) { 3765 DWORD old_protect; 3766 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 3767 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 3768 3769 if (!res) { 3770 if (PrintMiscellaneous && Verbose) { 3771 DWORD err = GetLastError(); 3772 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 3773 } 3774 // Don't consider this a hard error, on IA32 even if the 3775 // VirtualProtect fails, we should still be able to execute 3776 CloseHandle(hFile); 3777 return base; 3778 } 3779 } 3780 3781 if (CloseHandle(hFile) == 0) { 3782 if (PrintMiscellaneous && Verbose) { 3783 DWORD err = GetLastError(); 3784 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 3785 } 3786 return base; 3787 } 3788 3789 return base; 3790 } 3791 3792 3793 // Remap a block of memory. 3794 char* os::remap_memory(int fd, const char* file_name, size_t file_offset, 3795 char *addr, size_t bytes, bool read_only, 3796 bool allow_exec) { 3797 // This OS does not allow existing memory maps to be remapped so we 3798 // have to unmap the memory before we remap it. 3799 if (!os::unmap_memory(addr, bytes)) { 3800 return NULL; 3801 } 3802 3803 // There is a very small theoretical window between the unmap_memory() 3804 // call above and the map_memory() call below where a thread in native 3805 // code may be able to access an address that is no longer mapped. 3806 3807 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3808 allow_exec); 3809 } 3810 3811 3812 // Unmap a block of memory. 3813 // Returns true=success, otherwise false. 3814 3815 bool os::unmap_memory(char* addr, size_t bytes) { 3816 BOOL result = UnmapViewOfFile(addr); 3817 if (result == 0) { 3818 if (PrintMiscellaneous && Verbose) { 3819 DWORD err = GetLastError(); 3820 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 3821 } 3822 return false; 3823 } 3824 return true; 3825 } 3826 3827 void os::pause() { 3828 char filename[MAX_PATH]; 3829 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 3830 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 3831 } else { 3832 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 3833 } 3834 3835 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 3836 if (fd != -1) { 3837 struct stat buf; 3838 close(fd); 3839 while (::stat(filename, &buf) == 0) { 3840 Sleep(100); 3841 } 3842 } else { 3843 jio_fprintf(stderr, 3844 "Could not open pause file '%s', continuing immediately.\n", filename); 3845 } 3846 } 3847 3848 // An Event wraps a win32 "CreateEvent" kernel handle. 3849 // 3850 // We have a number of choices regarding "CreateEvent" win32 handle leakage: 3851 // 3852 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 3853 // field, and call CloseHandle() on the win32 event handle. Unpark() would 3854 // need to be modified to tolerate finding a NULL (invalid) win32 event handle. 3855 // In addition, an unpark() operation might fetch the handle field, but the 3856 // event could recycle between the fetch and the SetEvent() operation. 3857 // SetEvent() would either fail because the handle was invalid, or inadvertently work, 3858 // as the win32 handle value had been recycled. In an ideal world calling SetEvent() 3859 // on an stale but recycled handle would be harmless, but in practice this might 3860 // confuse other non-Sun code, so it's not a viable approach. 3861 // 3862 // 2: Once a win32 event handle is associated with an Event, it remains associated 3863 // with the Event. The event handle is never closed. This could be construed 3864 // as handle leakage, but only up to the maximum # of threads that have been extant 3865 // at any one time. This shouldn't be an issue, as windows platforms typically 3866 // permit a process to have hundreds of thousands of open handles. 3867 // 3868 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 3869 // and release unused handles. 3870 // 3871 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 3872 // It's not clear, however, that we wouldn't be trading one type of leak for another. 3873 // 3874 // 5. Use an RCU-like mechanism (Read-Copy Update). 3875 // Or perhaps something similar to Maged Michael's "Hazard pointers". 3876 // 3877 // We use (2). 3878 // 3879 // TODO-FIXME: 3880 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 3881 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 3882 // to recover from (or at least detect) the dreaded Windows 841176 bug. 3883 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 3884 // into a single win32 CreateEvent() handle. 3885 // 3886 // _Event transitions in park() 3887 // -1 => -1 : illegal 3888 // 1 => 0 : pass - return immediately 3889 // 0 => -1 : block 3890 // 3891 // _Event serves as a restricted-range semaphore : 3892 // -1 : thread is blocked 3893 // 0 : neutral - thread is running or ready 3894 // 1 : signaled - thread is running or ready 3895 // 3896 // Another possible encoding of _Event would be 3897 // with explicit "PARKED" and "SIGNALED" bits. 3898 3899 int os::PlatformEvent::park (jlong Millis) { 3900 guarantee (_ParkHandle != NULL , "Invariant") ; 3901 guarantee (Millis > 0 , "Invariant") ; 3902 int v ; 3903 3904 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 3905 // the initial park() operation. 3906 3907 for (;;) { 3908 v = _Event ; 3909 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 3910 } 3911 guarantee ((v == 0) || (v == 1), "invariant") ; 3912 if (v != 0) return OS_OK ; 3913 3914 // Do this the hard way by blocking ... 3915 // TODO: consider a brief spin here, gated on the success of recent 3916 // spin attempts by this thread. 3917 // 3918 // We decompose long timeouts into series of shorter timed waits. 3919 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 3920 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 3921 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 3922 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 3923 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 3924 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 3925 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 3926 // for the already waited time. This policy does not admit any new outcomes. 3927 // In the future, however, we might want to track the accumulated wait time and 3928 // adjust Millis accordingly if we encounter a spurious wakeup. 3929 3930 const int MAXTIMEOUT = 0x10000000 ; 3931 DWORD rv = WAIT_TIMEOUT ; 3932 while (_Event < 0 && Millis > 0) { 3933 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT) 3934 if (Millis > MAXTIMEOUT) { 3935 prd = MAXTIMEOUT ; 3936 } 3937 rv = ::WaitForSingleObject (_ParkHandle, prd) ; 3938 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ; 3939 if (rv == WAIT_TIMEOUT) { 3940 Millis -= prd ; 3941 } 3942 } 3943 v = _Event ; 3944 _Event = 0 ; 3945 OrderAccess::fence() ; 3946 // If we encounter a nearly simultanous timeout expiry and unpark() 3947 // we return OS_OK indicating we awoke via unpark(). 3948 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 3949 return (v >= 0) ? OS_OK : OS_TIMEOUT ; 3950 } 3951 3952 void os::PlatformEvent::park () { 3953 guarantee (_ParkHandle != NULL, "Invariant") ; 3954 // Invariant: Only the thread associated with the Event/PlatformEvent 3955 // may call park(). 3956 int v ; 3957 for (;;) { 3958 v = _Event ; 3959 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 3960 } 3961 guarantee ((v == 0) || (v == 1), "invariant") ; 3962 if (v != 0) return ; 3963 3964 // Do this the hard way by blocking ... 3965 // TODO: consider a brief spin here, gated on the success of recent 3966 // spin attempts by this thread. 3967 while (_Event < 0) { 3968 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ; 3969 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ; 3970 } 3971 3972 // Usually we'll find _Event == 0 at this point, but as 3973 // an optional optimization we clear it, just in case can 3974 // multiple unpark() operations drove _Event up to 1. 3975 _Event = 0 ; 3976 OrderAccess::fence() ; 3977 guarantee (_Event >= 0, "invariant") ; 3978 } 3979 3980 void os::PlatformEvent::unpark() { 3981 guarantee (_ParkHandle != NULL, "Invariant") ; 3982 int v ; 3983 for (;;) { 3984 v = _Event ; // Increment _Event if it's < 1. 3985 if (v > 0) { 3986 // If it's already signaled just return. 3987 // The LD of _Event could have reordered or be satisfied 3988 // by a read-aside from this processor's write buffer. 3989 // To avoid problems execute a barrier and then 3990 // ratify the value. A degenerate CAS() would also work. 3991 // Viz., CAS (v+0, &_Event, v) == v). 3992 OrderAccess::fence() ; 3993 if (_Event == v) return ; 3994 continue ; 3995 } 3996 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; 3997 } 3998 if (v < 0) { 3999 ::SetEvent (_ParkHandle) ; 4000 } 4001 } 4002 4003 4004 // JSR166 4005 // ------------------------------------------------------- 4006 4007 /* 4008 * The Windows implementation of Park is very straightforward: Basic 4009 * operations on Win32 Events turn out to have the right semantics to 4010 * use them directly. We opportunistically resuse the event inherited 4011 * from Monitor. 4012 */ 4013 4014 4015 void Parker::park(bool isAbsolute, jlong time) { 4016 guarantee (_ParkEvent != NULL, "invariant") ; 4017 // First, demultiplex/decode time arguments 4018 if (time < 0) { // don't wait 4019 return; 4020 } 4021 else if (time == 0) { 4022 time = INFINITE; 4023 } 4024 else if (isAbsolute) { 4025 time -= os::javaTimeMillis(); // convert to relative time 4026 if (time <= 0) // already elapsed 4027 return; 4028 } 4029 else { // relative 4030 time /= 1000000; // Must coarsen from nanos to millis 4031 if (time == 0) // Wait for the minimal time unit if zero 4032 time = 1; 4033 } 4034 4035 JavaThread* thread = (JavaThread*)(Thread::current()); 4036 assert(thread->is_Java_thread(), "Must be JavaThread"); 4037 JavaThread *jt = (JavaThread *)thread; 4038 4039 // Don't wait if interrupted or already triggered 4040 if (Thread::is_interrupted(thread, false) || 4041 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 4042 ResetEvent(_ParkEvent); 4043 return; 4044 } 4045 else { 4046 ThreadBlockInVM tbivm(jt); 4047 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4048 jt->set_suspend_equivalent(); 4049 4050 WaitForSingleObject(_ParkEvent, time); 4051 ResetEvent(_ParkEvent); 4052 4053 // If externally suspended while waiting, re-suspend 4054 if (jt->handle_special_suspend_equivalent_condition()) { 4055 jt->java_suspend_self(); 4056 } 4057 } 4058 } 4059 4060 void Parker::unpark() { 4061 guarantee (_ParkEvent != NULL, "invariant") ; 4062 SetEvent(_ParkEvent); 4063 } 4064 4065 // Run the specified command in a separate process. Return its exit value, 4066 // or -1 on failure (e.g. can't create a new process). 4067 int os::fork_and_exec(char* cmd) { 4068 STARTUPINFO si; 4069 PROCESS_INFORMATION pi; 4070 4071 memset(&si, 0, sizeof(si)); 4072 si.cb = sizeof(si); 4073 memset(&pi, 0, sizeof(pi)); 4074 BOOL rslt = CreateProcess(NULL, // executable name - use command line 4075 cmd, // command line 4076 NULL, // process security attribute 4077 NULL, // thread security attribute 4078 TRUE, // inherits system handles 4079 0, // no creation flags 4080 NULL, // use parent's environment block 4081 NULL, // use parent's starting directory 4082 &si, // (in) startup information 4083 &pi); // (out) process information 4084 4085 if (rslt) { 4086 // Wait until child process exits. 4087 WaitForSingleObject(pi.hProcess, INFINITE); 4088 4089 DWORD exit_code; 4090 GetExitCodeProcess(pi.hProcess, &exit_code); 4091 4092 // Close process and thread handles. 4093 CloseHandle(pi.hProcess); 4094 CloseHandle(pi.hThread); 4095 4096 return (int)exit_code; 4097 } else { 4098 return -1; 4099 } 4100 } 4101 4102 //-------------------------------------------------------------------------------------------------- 4103 // Non-product code 4104 4105 static int mallocDebugIntervalCounter = 0; 4106 static int mallocDebugCounter = 0; 4107 bool os::check_heap(bool force) { 4108 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 4109 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 4110 // Note: HeapValidate executes two hardware breakpoints when it finds something 4111 // wrong; at these points, eax contains the address of the offending block (I think). 4112 // To get to the exlicit error message(s) below, just continue twice. 4113 HANDLE heap = GetProcessHeap(); 4114 { HeapLock(heap); 4115 PROCESS_HEAP_ENTRY phe; 4116 phe.lpData = NULL; 4117 while (HeapWalk(heap, &phe) != 0) { 4118 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 4119 !HeapValidate(heap, 0, phe.lpData)) { 4120 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 4121 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 4122 fatal("corrupted C heap"); 4123 } 4124 } 4125 int err = GetLastError(); 4126 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 4127 fatal(err_msg("heap walk aborted with error %d", err)); 4128 } 4129 HeapUnlock(heap); 4130 } 4131 mallocDebugIntervalCounter = 0; 4132 } 4133 return true; 4134 } 4135 4136 4137 bool os::find(address addr, outputStream* st) { 4138 // Nothing yet 4139 return false; 4140 } 4141 4142 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 4143 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 4144 4145 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { 4146 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow(); 4147 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 4148 address addr = (address) exceptionRecord->ExceptionInformation[1]; 4149 4150 if (os::is_memory_serialize_page(thread, addr)) 4151 return EXCEPTION_CONTINUE_EXECUTION; 4152 } 4153 4154 return EXCEPTION_CONTINUE_SEARCH; 4155 } 4156 4157 static int getLastErrorString(char *buf, size_t len) 4158 { 4159 long errval; 4160 4161 if ((errval = GetLastError()) != 0) 4162 { 4163 /* DOS error */ 4164 size_t n = (size_t)FormatMessage( 4165 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 4166 NULL, 4167 errval, 4168 0, 4169 buf, 4170 (DWORD)len, 4171 NULL); 4172 if (n > 3) { 4173 /* Drop final '.', CR, LF */ 4174 if (buf[n - 1] == '\n') n--; 4175 if (buf[n - 1] == '\r') n--; 4176 if (buf[n - 1] == '.') n--; 4177 buf[n] = '\0'; 4178 } 4179 return (int)n; 4180 } 4181 4182 if (errno != 0) 4183 { 4184 /* C runtime error that has no corresponding DOS error code */ 4185 const char *s = strerror(errno); 4186 size_t n = strlen(s); 4187 if (n >= len) n = len - 1; 4188 strncpy(buf, s, n); 4189 buf[n] = '\0'; 4190 return (int)n; 4191 } 4192 return 0; 4193 } 4194 4195 4196 // We don't build a headless jre for Windows 4197 bool os::is_headless_jre() { return false; } 4198