os_windows.cpp revision 61:5a76ab815e34
1/* 2 * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any 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 66static HANDLE main_process; 67static HANDLE main_thread; 68static int main_thread_id; 69 70static FILETIME process_creation_time; 71static FILETIME process_exit_time; 72static FILETIME process_user_time; 73static FILETIME process_kernel_time; 74 75#ifdef _WIN64 76PVOID 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 89HINSTANCE vm_lib_handle; 90static int getLastErrorString(char *buf, size_t len); 91 92BOOL 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 115static 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 125bool 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. 132bool 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 140void os::run_periodic_checks() { 141 return; 142} 143 144#ifndef _WIN64 145LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 146#endif 147void os::init_system_properties_values() { 148 /* sysclasspath, java_home, dll_dir */ 149 { 150 char *home_path; 151 char *dll_path; 152 char *pslash; 153 char *bin = "\\bin"; 154 char home_dir[MAX_PATH]; 155 156 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) { 157 os::jvm_path(home_dir, sizeof(home_dir)); 158 // Found the full path to jvm[_g].dll. 159 // Now cut the path to <java_home>/jre if we can. 160 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */ 161 pslash = strrchr(home_dir, '\\'); 162 if (pslash != NULL) { 163 *pslash = '\0'; /* get rid of \{client|server} */ 164 pslash = strrchr(home_dir, '\\'); 165 if (pslash != NULL) 166 *pslash = '\0'; /* get rid of \bin */ 167 } 168 } 169 170 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1); 171 if (home_path == NULL) 172 return; 173 strcpy(home_path, home_dir); 174 Arguments::set_java_home(home_path); 175 176 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1); 177 if (dll_path == NULL) 178 return; 179 strcpy(dll_path, home_dir); 180 strcat(dll_path, bin); 181 Arguments::set_dll_dir(dll_path); 182 183 if (!set_boot_path('\\', ';')) 184 return; 185 } 186 187 /* library_path */ 188 #define EXT_DIR "\\lib\\ext" 189 #define BIN_DIR "\\bin" 190 #define PACKAGE_DIR "\\Sun\\Java" 191 { 192 /* Win32 library search order (See the documentation for LoadLibrary): 193 * 194 * 1. The directory from which application is loaded. 195 * 2. The current directory 196 * 3. The system wide Java Extensions directory (Java only) 197 * 4. System directory (GetSystemDirectory) 198 * 5. Windows directory (GetWindowsDirectory) 199 * 6. The PATH environment variable 200 */ 201 202 char *library_path; 203 char tmp[MAX_PATH]; 204 char *path_str = ::getenv("PATH"); 205 206 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 207 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10); 208 209 library_path[0] = '\0'; 210 211 GetModuleFileName(NULL, tmp, sizeof(tmp)); 212 *(strrchr(tmp, '\\')) = '\0'; 213 strcat(library_path, tmp); 214 215 strcat(library_path, ";."); 216 217 GetWindowsDirectory(tmp, sizeof(tmp)); 218 strcat(library_path, ";"); 219 strcat(library_path, tmp); 220 strcat(library_path, PACKAGE_DIR BIN_DIR); 221 222 GetSystemDirectory(tmp, sizeof(tmp)); 223 strcat(library_path, ";"); 224 strcat(library_path, tmp); 225 226 GetWindowsDirectory(tmp, sizeof(tmp)); 227 strcat(library_path, ";"); 228 strcat(library_path, tmp); 229 230 if (path_str) { 231 strcat(library_path, ";"); 232 strcat(library_path, path_str); 233 } 234 235 Arguments::set_library_path(library_path); 236 FREE_C_HEAP_ARRAY(char, library_path); 237 } 238 239 /* Default extensions directory */ 240 { 241 char path[MAX_PATH]; 242 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 243 GetWindowsDirectory(path, MAX_PATH); 244 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 245 path, PACKAGE_DIR, EXT_DIR); 246 Arguments::set_ext_dirs(buf); 247 } 248 #undef EXT_DIR 249 #undef BIN_DIR 250 #undef PACKAGE_DIR 251 252 /* Default endorsed standards directory. */ 253 { 254 #define ENDORSED_DIR "\\lib\\endorsed" 255 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR); 256 char * buf = NEW_C_HEAP_ARRAY(char, len); 257 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR); 258 Arguments::set_endorsed_dirs(buf); 259 #undef ENDORSED_DIR 260 } 261 262#ifndef _WIN64 263 SetUnhandledExceptionFilter(Handle_FLT_Exception); 264#endif 265 266 // Done 267 return; 268} 269 270void os::breakpoint() { 271 DebugBreak(); 272} 273 274// Invoked from the BREAKPOINT Macro 275extern "C" void breakpoint() { 276 os::breakpoint(); 277} 278 279// Returns an estimate of the current stack pointer. Result must be guaranteed 280// to point into the calling threads stack, and be no lower than the current 281// stack pointer. 282 283address os::current_stack_pointer() { 284 int dummy; 285 address sp = (address)&dummy; 286 return sp; 287} 288 289// os::current_stack_base() 290// 291// Returns the base of the stack, which is the stack's 292// starting address. This function must be called 293// while running on the stack of the thread being queried. 294 295address os::current_stack_base() { 296 MEMORY_BASIC_INFORMATION minfo; 297 address stack_bottom; 298 size_t stack_size; 299 300 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 301 stack_bottom = (address)minfo.AllocationBase; 302 stack_size = minfo.RegionSize; 303 304 // Add up the sizes of all the regions with the same 305 // AllocationBase. 306 while( 1 ) 307 { 308 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 309 if ( stack_bottom == (address)minfo.AllocationBase ) 310 stack_size += minfo.RegionSize; 311 else 312 break; 313 } 314 315#ifdef _M_IA64 316 // IA64 has memory and register stacks 317 stack_size = stack_size / 2; 318#endif 319 return stack_bottom + stack_size; 320} 321 322size_t os::current_stack_size() { 323 size_t sz; 324 MEMORY_BASIC_INFORMATION minfo; 325 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 326 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 327 return sz; 328} 329 330 331LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 332 333// Thread start routine for all new Java threads 334static unsigned __stdcall java_start(Thread* thread) { 335 // Try to randomize the cache line index of hot stack frames. 336 // This helps when threads of the same stack traces evict each other's 337 // cache lines. The threads can be either from the same JVM instance, or 338 // from different JVM instances. The benefit is especially true for 339 // processors with hyperthreading technology. 340 static int counter = 0; 341 int pid = os::current_process_id(); 342 _alloca(((pid ^ counter++) & 7) * 128); 343 344 OSThread* osthr = thread->osthread(); 345 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 346 347 if (UseNUMA) { 348 int lgrp_id = os::numa_get_group_id(); 349 if (lgrp_id != -1) { 350 thread->set_lgrp_id(lgrp_id); 351 } 352 } 353 354 355 if (UseVectoredExceptions) { 356 // If we are using vectored exception we don't need to set a SEH 357 thread->run(); 358 } 359 else { 360 // Install a win32 structured exception handler around every thread created 361 // by VM, so VM can genrate error dump when an exception occurred in non- 362 // Java thread (e.g. VM thread). 363 __try { 364 thread->run(); 365 } __except(topLevelExceptionFilter( 366 (_EXCEPTION_POINTERS*)_exception_info())) { 367 // Nothing to do. 368 } 369 } 370 371 // One less thread is executing 372 // When the VMThread gets here, the main thread may have already exited 373 // which frees the CodeHeap containing the Atomic::add code 374 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 375 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); 376 } 377 378 return 0; 379} 380 381static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) { 382 // Allocate the OSThread object 383 OSThread* osthread = new OSThread(NULL, NULL); 384 if (osthread == NULL) return NULL; 385 386 // Initialize support for Java interrupts 387 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 388 if (interrupt_event == NULL) { 389 delete osthread; 390 return NULL; 391 } 392 osthread->set_interrupt_event(interrupt_event); 393 394 // Store info on the Win32 thread into the OSThread 395 osthread->set_thread_handle(thread_handle); 396 osthread->set_thread_id(thread_id); 397 398 if (UseNUMA) { 399 int lgrp_id = os::numa_get_group_id(); 400 if (lgrp_id != -1) { 401 thread->set_lgrp_id(lgrp_id); 402 } 403 } 404 405 // Initial thread state is INITIALIZED, not SUSPENDED 406 osthread->set_state(INITIALIZED); 407 408 return osthread; 409} 410 411 412bool os::create_attached_thread(JavaThread* thread) { 413#ifdef ASSERT 414 thread->verify_not_published(); 415#endif 416 HANDLE thread_h; 417 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 418 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 419 fatal("DuplicateHandle failed\n"); 420 } 421 OSThread* osthread = create_os_thread(thread, thread_h, 422 (int)current_thread_id()); 423 if (osthread == NULL) { 424 return false; 425 } 426 427 // Initial thread state is RUNNABLE 428 osthread->set_state(RUNNABLE); 429 430 thread->set_osthread(osthread); 431 return true; 432} 433 434bool os::create_main_thread(JavaThread* thread) { 435#ifdef ASSERT 436 thread->verify_not_published(); 437#endif 438 if (_starting_thread == NULL) { 439 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 440 if (_starting_thread == NULL) { 441 return false; 442 } 443 } 444 445 // The primordial thread is runnable from the start) 446 _starting_thread->set_state(RUNNABLE); 447 448 thread->set_osthread(_starting_thread); 449 return true; 450} 451 452// Allocate and initialize a new OSThread 453bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 454 unsigned thread_id; 455 456 // Allocate the OSThread object 457 OSThread* osthread = new OSThread(NULL, NULL); 458 if (osthread == NULL) { 459 return false; 460 } 461 462 // Initialize support for Java interrupts 463 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 464 if (interrupt_event == NULL) { 465 delete osthread; 466 return NULL; 467 } 468 osthread->set_interrupt_event(interrupt_event); 469 osthread->set_interrupted(false); 470 471 thread->set_osthread(osthread); 472 473 if (stack_size == 0) { 474 switch (thr_type) { 475 case os::java_thread: 476 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 477 if (JavaThread::stack_size_at_create() > 0) 478 stack_size = JavaThread::stack_size_at_create(); 479 break; 480 case os::compiler_thread: 481 if (CompilerThreadStackSize > 0) { 482 stack_size = (size_t)(CompilerThreadStackSize * K); 483 break; 484 } // else fall through: 485 // use VMThreadStackSize if CompilerThreadStackSize is not defined 486 case os::vm_thread: 487 case os::pgc_thread: 488 case os::cgc_thread: 489 case os::watcher_thread: 490 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 491 break; 492 } 493 } 494 495 // Create the Win32 thread 496 // 497 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 498 // does not specify stack size. Instead, it specifies the size of 499 // initially committed space. The stack size is determined by 500 // PE header in the executable. If the committed "stack_size" is larger 501 // than default value in the PE header, the stack is rounded up to the 502 // nearest multiple of 1MB. For example if the launcher has default 503 // stack size of 320k, specifying any size less than 320k does not 504 // affect the actual stack size at all, it only affects the initial 505 // commitment. On the other hand, specifying 'stack_size' larger than 506 // default value may cause significant increase in memory usage, because 507 // not only the stack space will be rounded up to MB, but also the 508 // entire space is committed upfront. 509 // 510 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 511 // for CreateThread() that can treat 'stack_size' as stack size. However we 512 // are not supposed to call CreateThread() directly according to MSDN 513 // document because JVM uses C runtime library. The good news is that the 514 // flag appears to work with _beginthredex() as well. 515 516#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION 517#define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000) 518#endif 519 520 HANDLE thread_handle = 521 (HANDLE)_beginthreadex(NULL, 522 (unsigned)stack_size, 523 (unsigned (__stdcall *)(void*)) java_start, 524 thread, 525 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, 526 &thread_id); 527 if (thread_handle == NULL) { 528 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again 529 // without the flag. 530 thread_handle = 531 (HANDLE)_beginthreadex(NULL, 532 (unsigned)stack_size, 533 (unsigned (__stdcall *)(void*)) java_start, 534 thread, 535 CREATE_SUSPENDED, 536 &thread_id); 537 } 538 if (thread_handle == NULL) { 539 // Need to clean up stuff we've allocated so far 540 CloseHandle(osthread->interrupt_event()); 541 thread->set_osthread(NULL); 542 delete osthread; 543 return NULL; 544 } 545 546 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); 547 548 // Store info on the Win32 thread into the OSThread 549 osthread->set_thread_handle(thread_handle); 550 osthread->set_thread_id(thread_id); 551 552 // Initial thread state is INITIALIZED, not SUSPENDED 553 osthread->set_state(INITIALIZED); 554 555 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 556 return true; 557} 558 559 560// Free Win32 resources related to the OSThread 561void os::free_thread(OSThread* osthread) { 562 assert(osthread != NULL, "osthread not set"); 563 CloseHandle(osthread->thread_handle()); 564 CloseHandle(osthread->interrupt_event()); 565 delete osthread; 566} 567 568 569static int has_performance_count = 0; 570static jlong first_filetime; 571static jlong initial_performance_count; 572static jlong performance_frequency; 573 574 575jlong as_long(LARGE_INTEGER x) { 576 jlong result = 0; // initialization to avoid warning 577 set_high(&result, x.HighPart); 578 set_low(&result, x.LowPart); 579 return result; 580} 581 582 583jlong os::elapsed_counter() { 584 LARGE_INTEGER count; 585 if (has_performance_count) { 586 QueryPerformanceCounter(&count); 587 return as_long(count) - initial_performance_count; 588 } else { 589 FILETIME wt; 590 GetSystemTimeAsFileTime(&wt); 591 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime); 592 } 593} 594 595 596jlong os::elapsed_frequency() { 597 if (has_performance_count) { 598 return performance_frequency; 599 } else { 600 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601. 601 return 10000000; 602 } 603} 604 605 606julong os::available_memory() { 607 return win32::available_memory(); 608} 609 610julong os::win32::available_memory() { 611 // FIXME: GlobalMemoryStatus() may return incorrect value if total memory 612 // is larger than 4GB 613 MEMORYSTATUS ms; 614 GlobalMemoryStatus(&ms); 615 616 return (julong)ms.dwAvailPhys; 617} 618 619julong os::physical_memory() { 620 return win32::physical_memory(); 621} 622 623julong os::allocatable_physical_memory(julong size) { 624 return MIN2(size, (julong)1400*M); 625} 626 627// VC6 lacks DWORD_PTR 628#if _MSC_VER < 1300 629typedef UINT_PTR DWORD_PTR; 630#endif 631 632int os::active_processor_count() { 633 DWORD_PTR lpProcessAffinityMask = 0; 634 DWORD_PTR lpSystemAffinityMask = 0; 635 int proc_count = processor_count(); 636 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 637 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 638 // Nof active processors is number of bits in process affinity mask 639 int bitcount = 0; 640 while (lpProcessAffinityMask != 0) { 641 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 642 bitcount++; 643 } 644 return bitcount; 645 } else { 646 return proc_count; 647 } 648} 649 650bool os::distribute_processes(uint length, uint* distribution) { 651 // Not yet implemented. 652 return false; 653} 654 655bool os::bind_to_processor(uint processor_id) { 656 // Not yet implemented. 657 return false; 658} 659 660static void initialize_performance_counter() { 661 LARGE_INTEGER count; 662 if (QueryPerformanceFrequency(&count)) { 663 has_performance_count = 1; 664 performance_frequency = as_long(count); 665 QueryPerformanceCounter(&count); 666 initial_performance_count = as_long(count); 667 } else { 668 has_performance_count = 0; 669 FILETIME wt; 670 GetSystemTimeAsFileTime(&wt); 671 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 672 } 673} 674 675 676double os::elapsedTime() { 677 return (double) elapsed_counter() / (double) elapsed_frequency(); 678} 679 680 681// Windows format: 682// The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 683// Java format: 684// Java standards require the number of milliseconds since 1/1/1970 685 686// Constant offset - calculated using offset() 687static jlong _offset = 116444736000000000; 688// Fake time counter for reproducible results when debugging 689static jlong fake_time = 0; 690 691#ifdef ASSERT 692// Just to be safe, recalculate the offset in debug mode 693static jlong _calculated_offset = 0; 694static int _has_calculated_offset = 0; 695 696jlong offset() { 697 if (_has_calculated_offset) return _calculated_offset; 698 SYSTEMTIME java_origin; 699 java_origin.wYear = 1970; 700 java_origin.wMonth = 1; 701 java_origin.wDayOfWeek = 0; // ignored 702 java_origin.wDay = 1; 703 java_origin.wHour = 0; 704 java_origin.wMinute = 0; 705 java_origin.wSecond = 0; 706 java_origin.wMilliseconds = 0; 707 FILETIME jot; 708 if (!SystemTimeToFileTime(&java_origin, &jot)) { 709 fatal1("Error = %d\nWindows error", GetLastError()); 710 } 711 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 712 _has_calculated_offset = 1; 713 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 714 return _calculated_offset; 715} 716#else 717jlong offset() { 718 return _offset; 719} 720#endif 721 722jlong windows_to_java_time(FILETIME wt) { 723 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 724 return (a - offset()) / 10000; 725} 726 727FILETIME java_to_windows_time(jlong l) { 728 jlong a = (l * 10000) + offset(); 729 FILETIME result; 730 result.dwHighDateTime = high(a); 731 result.dwLowDateTime = low(a); 732 return result; 733} 734 735jlong os::javaTimeMillis() { 736 if (UseFakeTimers) { 737 return fake_time++; 738 } else { 739 FILETIME wt; 740 GetSystemTimeAsFileTime(&wt); 741 return windows_to_java_time(wt); 742 } 743} 744 745#define NANOS_PER_SEC CONST64(1000000000) 746#define NANOS_PER_MILLISEC 1000000 747jlong os::javaTimeNanos() { 748 if (!has_performance_count) { 749 return javaTimeMillis() * NANOS_PER_MILLISEC; // the best we can do. 750 } else { 751 LARGE_INTEGER current_count; 752 QueryPerformanceCounter(¤t_count); 753 double current = as_long(current_count); 754 double freq = performance_frequency; 755 jlong time = (jlong)((current/freq) * NANOS_PER_SEC); 756 return time; 757 } 758} 759 760void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 761 if (!has_performance_count) { 762 // javaTimeMillis() doesn't have much percision, 763 // but it is not going to wrap -- so all 64 bits 764 info_ptr->max_value = ALL_64_BITS; 765 766 // this is a wall clock timer, so may skip 767 info_ptr->may_skip_backward = true; 768 info_ptr->may_skip_forward = true; 769 } else { 770 jlong freq = performance_frequency; 771 if (freq < NANOS_PER_SEC) { 772 // the performance counter is 64 bits and we will 773 // be multiplying it -- so no wrap in 64 bits 774 info_ptr->max_value = ALL_64_BITS; 775 } else if (freq > NANOS_PER_SEC) { 776 // use the max value the counter can reach to 777 // determine the max value which could be returned 778 julong max_counter = (julong)ALL_64_BITS; 779 info_ptr->max_value = (jlong)(max_counter / (freq / NANOS_PER_SEC)); 780 } else { 781 // the performance counter is 64 bits and we will 782 // be using it directly -- so no wrap in 64 bits 783 info_ptr->max_value = ALL_64_BITS; 784 } 785 786 // using a counter, so no skipping 787 info_ptr->may_skip_backward = false; 788 info_ptr->may_skip_forward = false; 789 } 790 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 791} 792 793char* os::local_time_string(char *buf, size_t buflen) { 794 SYSTEMTIME st; 795 GetLocalTime(&st); 796 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 797 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 798 return buf; 799} 800 801bool os::getTimesSecs(double* process_real_time, 802 double* process_user_time, 803 double* process_system_time) { 804 HANDLE h_process = GetCurrentProcess(); 805 FILETIME create_time, exit_time, kernel_time, user_time; 806 BOOL result = GetProcessTimes(h_process, 807 &create_time, 808 &exit_time, 809 &kernel_time, 810 &user_time); 811 if (result != 0) { 812 FILETIME wt; 813 GetSystemTimeAsFileTime(&wt); 814 jlong rtc_millis = windows_to_java_time(wt); 815 jlong user_millis = windows_to_java_time(user_time); 816 jlong system_millis = windows_to_java_time(kernel_time); 817 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 818 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); 819 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); 820 return true; 821 } else { 822 return false; 823 } 824} 825 826void os::shutdown() { 827 828 // allow PerfMemory to attempt cleanup of any persistent resources 829 perfMemory_exit(); 830 831 // flush buffered output, finish log files 832 ostream_abort(); 833 834 // Check for abort hook 835 abort_hook_t abort_hook = Arguments::abort_hook(); 836 if (abort_hook != NULL) { 837 abort_hook(); 838 } 839} 840 841void os::abort(bool dump_core) 842{ 843 os::shutdown(); 844 // no core dump on Windows 845 ::exit(1); 846} 847 848// Die immediately, no exit hook, no abort hook, no cleanup. 849void os::die() { 850 _exit(-1); 851} 852 853// Directory routines copied from src/win32/native/java/io/dirent_md.c 854// * dirent_md.c 1.15 00/02/02 855// 856// The declarations for DIR and struct dirent are in jvm_win32.h. 857 858/* Caller must have already run dirname through JVM_NativePath, which removes 859 duplicate slashes and converts all instances of '/' into '\\'. */ 860 861DIR * 862os::opendir(const char *dirname) 863{ 864 assert(dirname != NULL, "just checking"); // hotspot change 865 DIR *dirp = (DIR *)malloc(sizeof(DIR)); 866 DWORD fattr; // hotspot change 867 char alt_dirname[4] = { 0, 0, 0, 0 }; 868 869 if (dirp == 0) { 870 errno = ENOMEM; 871 return 0; 872 } 873 874 /* 875 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it 876 * as a directory in FindFirstFile(). We detect this case here and 877 * prepend the current drive name. 878 */ 879 if (dirname[1] == '\0' && dirname[0] == '\\') { 880 alt_dirname[0] = _getdrive() + 'A' - 1; 881 alt_dirname[1] = ':'; 882 alt_dirname[2] = '\\'; 883 alt_dirname[3] = '\0'; 884 dirname = alt_dirname; 885 } 886 887 dirp->path = (char *)malloc(strlen(dirname) + 5); 888 if (dirp->path == 0) { 889 free(dirp); 890 errno = ENOMEM; 891 return 0; 892 } 893 strcpy(dirp->path, dirname); 894 895 fattr = GetFileAttributes(dirp->path); 896 if (fattr == 0xffffffff) { 897 free(dirp->path); 898 free(dirp); 899 errno = ENOENT; 900 return 0; 901 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 902 free(dirp->path); 903 free(dirp); 904 errno = ENOTDIR; 905 return 0; 906 } 907 908 /* Append "*.*", or possibly "\\*.*", to path */ 909 if (dirp->path[1] == ':' 910 && (dirp->path[2] == '\0' 911 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 912 /* No '\\' needed for cases like "Z:" or "Z:\" */ 913 strcat(dirp->path, "*.*"); 914 } else { 915 strcat(dirp->path, "\\*.*"); 916 } 917 918 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 919 if (dirp->handle == INVALID_HANDLE_VALUE) { 920 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 921 free(dirp->path); 922 free(dirp); 923 errno = EACCES; 924 return 0; 925 } 926 } 927 return dirp; 928} 929 930/* parameter dbuf unused on Windows */ 931 932struct dirent * 933os::readdir(DIR *dirp, dirent *dbuf) 934{ 935 assert(dirp != NULL, "just checking"); // hotspot change 936 if (dirp->handle == INVALID_HANDLE_VALUE) { 937 return 0; 938 } 939 940 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 941 942 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 943 if (GetLastError() == ERROR_INVALID_HANDLE) { 944 errno = EBADF; 945 return 0; 946 } 947 FindClose(dirp->handle); 948 dirp->handle = INVALID_HANDLE_VALUE; 949 } 950 951 return &dirp->dirent; 952} 953 954int 955os::closedir(DIR *dirp) 956{ 957 assert(dirp != NULL, "just checking"); // hotspot change 958 if (dirp->handle != INVALID_HANDLE_VALUE) { 959 if (!FindClose(dirp->handle)) { 960 errno = EBADF; 961 return -1; 962 } 963 dirp->handle = INVALID_HANDLE_VALUE; 964 } 965 free(dirp->path); 966 free(dirp); 967 return 0; 968} 969 970const char* os::dll_file_extension() { return ".dll"; } 971 972const char * os::get_temp_directory() 973{ 974 static char path_buf[MAX_PATH]; 975 if (GetTempPath(MAX_PATH, path_buf)>0) 976 return path_buf; 977 else{ 978 path_buf[0]='\0'; 979 return path_buf; 980 } 981} 982 983// Needs to be in os specific directory because windows requires another 984// header file <direct.h> 985const char* os::get_current_directory(char *buf, int buflen) { 986 return _getcwd(buf, buflen); 987} 988 989//----------------------------------------------------------- 990// Helper functions for fatal error handler 991 992// The following library functions are resolved dynamically at runtime: 993 994// PSAPI functions, for Windows NT, 2000, XP 995 996// psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform 997// SDK from Microsoft. Here are the definitions copied from psapi.h 998typedef struct _MODULEINFO { 999 LPVOID lpBaseOfDll; 1000 DWORD SizeOfImage; 1001 LPVOID EntryPoint; 1002} MODULEINFO, *LPMODULEINFO; 1003 1004static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD ); 1005static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD ); 1006static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD ); 1007 1008// ToolHelp Functions, for Windows 95, 98 and ME 1009 1010static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ; 1011static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ; 1012static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ; 1013 1014bool _has_psapi; 1015bool _psapi_init = false; 1016bool _has_toolhelp; 1017 1018static bool _init_psapi() { 1019 HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ; 1020 if( psapi == NULL ) return false ; 1021 1022 _EnumProcessModules = CAST_TO_FN_PTR( 1023 BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD), 1024 GetProcAddress(psapi, "EnumProcessModules")) ; 1025 _GetModuleFileNameEx = CAST_TO_FN_PTR( 1026 DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD), 1027 GetProcAddress(psapi, "GetModuleFileNameExA")); 1028 _GetModuleInformation = CAST_TO_FN_PTR( 1029 BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD), 1030 GetProcAddress(psapi, "GetModuleInformation")); 1031 1032 _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation); 1033 _psapi_init = true; 1034 return _has_psapi; 1035} 1036 1037static bool _init_toolhelp() { 1038 HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ; 1039 if (kernel32 == NULL) return false ; 1040 1041 _CreateToolhelp32Snapshot = CAST_TO_FN_PTR( 1042 HANDLE(WINAPI *)(DWORD,DWORD), 1043 GetProcAddress(kernel32, "CreateToolhelp32Snapshot")); 1044 _Module32First = CAST_TO_FN_PTR( 1045 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32), 1046 GetProcAddress(kernel32, "Module32First" )); 1047 _Module32Next = CAST_TO_FN_PTR( 1048 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32), 1049 GetProcAddress(kernel32, "Module32Next" )); 1050 1051 _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next); 1052 return _has_toolhelp; 1053} 1054 1055#ifdef _WIN64 1056// Helper routine which returns true if address in 1057// within the NTDLL address space. 1058// 1059static bool _addr_in_ntdll( address addr ) 1060{ 1061 HMODULE hmod; 1062 MODULEINFO minfo; 1063 1064 hmod = GetModuleHandle("NTDLL.DLL"); 1065 if ( hmod == NULL ) return false; 1066 if ( !_GetModuleInformation( GetCurrentProcess(), hmod, 1067 &minfo, sizeof(MODULEINFO)) ) 1068 return false; 1069 1070 if ( (addr >= minfo.lpBaseOfDll) && 1071 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) 1072 return true; 1073 else 1074 return false; 1075} 1076#endif 1077 1078 1079// Enumerate all modules for a given process ID 1080// 1081// Notice that Windows 95/98/Me and Windows NT/2000/XP have 1082// different API for doing this. We use PSAPI.DLL on NT based 1083// Windows and ToolHelp on 95/98/Me. 1084 1085// Callback function that is called by enumerate_modules() on 1086// every DLL module. 1087// Input parameters: 1088// int pid, 1089// char* module_file_name, 1090// address module_base_addr, 1091// unsigned module_size, 1092// void* param 1093typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *); 1094 1095// enumerate_modules for Windows NT, using PSAPI 1096static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param) 1097{ 1098 HANDLE hProcess ; 1099 1100# define MAX_NUM_MODULES 128 1101 HMODULE modules[MAX_NUM_MODULES]; 1102 static char filename[ MAX_PATH ]; 1103 int result = 0; 1104 1105 if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0; 1106 1107 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1108 FALSE, pid ) ; 1109 if (hProcess == NULL) return 0; 1110 1111 DWORD size_needed; 1112 if (!_EnumProcessModules(hProcess, modules, 1113 sizeof(modules), &size_needed)) { 1114 CloseHandle( hProcess ); 1115 return 0; 1116 } 1117 1118 // number of modules that are currently loaded 1119 int num_modules = size_needed / sizeof(HMODULE); 1120 1121 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1122 // Get Full pathname: 1123 if(!_GetModuleFileNameEx(hProcess, modules[i], 1124 filename, sizeof(filename))) { 1125 filename[0] = '\0'; 1126 } 1127 1128 MODULEINFO modinfo; 1129 if (!_GetModuleInformation(hProcess, modules[i], 1130 &modinfo, sizeof(modinfo))) { 1131 modinfo.lpBaseOfDll = NULL; 1132 modinfo.SizeOfImage = 0; 1133 } 1134 1135 // Invoke callback function 1136 result = func(pid, filename, (address)modinfo.lpBaseOfDll, 1137 modinfo.SizeOfImage, param); 1138 if (result) break; 1139 } 1140 1141 CloseHandle( hProcess ) ; 1142 return result; 1143} 1144 1145 1146// enumerate_modules for Windows 95/98/ME, using TOOLHELP 1147static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param) 1148{ 1149 HANDLE hSnapShot ; 1150 static MODULEENTRY32 modentry ; 1151 int result = 0; 1152 1153 if (!_has_toolhelp) return 0; 1154 1155 // Get a handle to a Toolhelp snapshot of the system 1156 hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ; 1157 if( hSnapShot == INVALID_HANDLE_VALUE ) { 1158 return FALSE ; 1159 } 1160 1161 // iterate through all modules 1162 modentry.dwSize = sizeof(MODULEENTRY32) ; 1163 bool not_done = _Module32First( hSnapShot, &modentry ) != 0; 1164 1165 while( not_done ) { 1166 // invoke the callback 1167 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr, 1168 modentry.modBaseSize, param); 1169 if (result) break; 1170 1171 modentry.dwSize = sizeof(MODULEENTRY32) ; 1172 not_done = _Module32Next( hSnapShot, &modentry ) != 0; 1173 } 1174 1175 CloseHandle(hSnapShot); 1176 return result; 1177} 1178 1179int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param ) 1180{ 1181 // Get current process ID if caller doesn't provide it. 1182 if (!pid) pid = os::current_process_id(); 1183 1184 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param); 1185 else return _enumerate_modules_windows(pid, func, param); 1186} 1187 1188struct _modinfo { 1189 address addr; 1190 char* full_path; // point to a char buffer 1191 int buflen; // size of the buffer 1192 address base_addr; 1193}; 1194 1195static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr, 1196 unsigned size, void * param) { 1197 struct _modinfo *pmod = (struct _modinfo *)param; 1198 if (!pmod) return -1; 1199 1200 if (base_addr <= pmod->addr && 1201 base_addr+size > pmod->addr) { 1202 // if a buffer is provided, copy path name to the buffer 1203 if (pmod->full_path) { 1204 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1205 } 1206 pmod->base_addr = base_addr; 1207 return 1; 1208 } 1209 return 0; 1210} 1211 1212bool os::dll_address_to_library_name(address addr, char* buf, 1213 int buflen, int* offset) { 1214// NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1215// return the full path to the DLL file, sometimes it returns path 1216// to the corresponding PDB file (debug info); sometimes it only 1217// returns partial path, which makes life painful. 1218 1219 struct _modinfo mi; 1220 mi.addr = addr; 1221 mi.full_path = buf; 1222 mi.buflen = buflen; 1223 int pid = os::current_process_id(); 1224 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) { 1225 // buf already contains path name 1226 if (offset) *offset = addr - mi.base_addr; 1227 return true; 1228 } else { 1229 if (buf) buf[0] = '\0'; 1230 if (offset) *offset = -1; 1231 return false; 1232 } 1233} 1234 1235bool os::dll_address_to_function_name(address addr, char *buf, 1236 int buflen, int *offset) { 1237 // Unimplemented on Windows - in order to use SymGetSymFromAddr(), 1238 // we need to initialize imagehlp/dbghelp, then load symbol table 1239 // for every module. That's too much work to do after a fatal error. 1240 // For an example on how to implement this function, see 1.4.2. 1241 if (offset) *offset = -1; 1242 if (buf) buf[0] = '\0'; 1243 return false; 1244} 1245 1246// save the start and end address of jvm.dll into param[0] and param[1] 1247static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr, 1248 unsigned size, void * param) { 1249 if (!param) return -1; 1250 1251 if (base_addr <= (address)_locate_jvm_dll && 1252 base_addr+size > (address)_locate_jvm_dll) { 1253 ((address*)param)[0] = base_addr; 1254 ((address*)param)[1] = base_addr + size; 1255 return 1; 1256 } 1257 return 0; 1258} 1259 1260address vm_lib_location[2]; // start and end address of jvm.dll 1261 1262// check if addr is inside jvm.dll 1263bool os::address_is_in_vm(address addr) { 1264 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1265 int pid = os::current_process_id(); 1266 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) { 1267 assert(false, "Can't find jvm module."); 1268 return false; 1269 } 1270 } 1271 1272 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1273} 1274 1275// print module info; param is outputStream* 1276static int _print_module(int pid, char* fname, address base, 1277 unsigned size, void* param) { 1278 if (!param) return -1; 1279 1280 outputStream* st = (outputStream*)param; 1281 1282 address end_addr = base + size; 1283 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname); 1284 return 0; 1285} 1286 1287// Loads .dll/.so and 1288// in case of error it checks if .dll/.so was built for the 1289// same architecture as Hotspot is running on 1290void * os::dll_load(const char *name, char *ebuf, int ebuflen) 1291{ 1292 void * result = LoadLibrary(name); 1293 if (result != NULL) 1294 { 1295 return result; 1296 } 1297 1298 long errcode = GetLastError(); 1299 if (errcode == ERROR_MOD_NOT_FOUND) { 1300 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1); 1301 ebuf[ebuflen-1]='\0'; 1302 return NULL; 1303 } 1304 1305 // Parsing dll below 1306 // If we can read dll-info and find that dll was built 1307 // for an architecture other than Hotspot is running in 1308 // - then print to buffer "DLL was built for a different architecture" 1309 // else call getLastErrorString to obtain system error message 1310 1311 // Read system error message into ebuf 1312 // It may or may not be overwritten below (in the for loop and just above) 1313 getLastErrorString(ebuf, (size_t) ebuflen); 1314 ebuf[ebuflen-1]='\0'; 1315 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0); 1316 if (file_descriptor<0) 1317 { 1318 return NULL; 1319 } 1320 1321 uint32_t signature_offset; 1322 uint16_t lib_arch=0; 1323 bool failed_to_get_lib_arch= 1324 ( 1325 //Go to position 3c in the dll 1326 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0) 1327 || 1328 // Read loacation of signature 1329 (sizeof(signature_offset)!= 1330 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset)))) 1331 || 1332 //Go to COFF File Header in dll 1333 //that is located after"signature" (4 bytes long) 1334 (os::seek_to_file_offset(file_descriptor, 1335 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0) 1336 || 1337 //Read field that contains code of architecture 1338 // that dll was build for 1339 (sizeof(lib_arch)!= 1340 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch)))) 1341 ); 1342 1343 ::close(file_descriptor); 1344 if (failed_to_get_lib_arch) 1345 { 1346 // file i/o error - report getLastErrorString(...) msg 1347 return NULL; 1348 } 1349 1350 typedef struct 1351 { 1352 uint16_t arch_code; 1353 char* arch_name; 1354 } arch_t; 1355 1356 static const arch_t arch_array[]={ 1357 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1358 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1359 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1360 }; 1361 #if (defined _M_IA64) 1362 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64; 1363 #elif (defined _M_AMD64) 1364 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64; 1365 #elif (defined _M_IX86) 1366 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386; 1367 #else 1368 #error Method os::dll_load requires that one of following \ 1369 is defined :_M_IA64,_M_AMD64 or _M_IX86 1370 #endif 1371 1372 1373 // Obtain a string for printf operation 1374 // lib_arch_str shall contain string what platform this .dll was built for 1375 // running_arch_str shall string contain what platform Hotspot was built for 1376 char *running_arch_str=NULL,*lib_arch_str=NULL; 1377 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++) 1378 { 1379 if (lib_arch==arch_array[i].arch_code) 1380 lib_arch_str=arch_array[i].arch_name; 1381 if (running_arch==arch_array[i].arch_code) 1382 running_arch_str=arch_array[i].arch_name; 1383 } 1384 1385 assert(running_arch_str, 1386 "Didn't find runing architecture code in arch_array"); 1387 1388 // If the architure is right 1389 // but some other error took place - report getLastErrorString(...) msg 1390 if (lib_arch == running_arch) 1391 { 1392 return NULL; 1393 } 1394 1395 if (lib_arch_str!=NULL) 1396 { 1397 ::_snprintf(ebuf, ebuflen-1, 1398 "Can't load %s-bit .dll on a %s-bit platform", 1399 lib_arch_str,running_arch_str); 1400 } 1401 else 1402 { 1403 // don't know what architecture this dll was build for 1404 ::_snprintf(ebuf, ebuflen-1, 1405 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1406 lib_arch,running_arch_str); 1407 } 1408 1409 return NULL; 1410} 1411 1412 1413void os::print_dll_info(outputStream *st) { 1414 int pid = os::current_process_id(); 1415 st->print_cr("Dynamic libraries:"); 1416 enumerate_modules(pid, _print_module, (void *)st); 1417} 1418 1419void os::print_os_info(outputStream* st) { 1420 st->print("OS:"); 1421 1422 OSVERSIONINFOEX osvi; 1423 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1424 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1425 1426 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1427 st->print_cr("N/A"); 1428 return; 1429 } 1430 1431 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion; 1432 1433 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) { 1434 switch (os_vers) { 1435 case 3051: st->print(" Windows NT 3.51"); break; 1436 case 4000: st->print(" Windows NT 4.0"); break; 1437 case 5000: st->print(" Windows 2000"); break; 1438 case 5001: st->print(" Windows XP"); break; 1439 case 5002: st->print(" Windows Server 2003 family"); break; 1440 case 6000: st->print(" Windows Vista"); break; 1441 default: // future windows, print out its major and minor versions 1442 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1443 } 1444 } else { 1445 switch (os_vers) { 1446 case 4000: st->print(" Windows 95"); break; 1447 case 4010: st->print(" Windows 98"); break; 1448 case 4090: st->print(" Windows Me"); break; 1449 default: // future windows, print out its major and minor versions 1450 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1451 } 1452 } 1453 1454 st->print(" Build %d", osvi.dwBuildNumber); 1455 st->print(" %s", osvi.szCSDVersion); // service pack 1456 st->cr(); 1457} 1458 1459void os::print_memory_info(outputStream* st) { 1460 st->print("Memory:"); 1461 st->print(" %dk page", os::vm_page_size()>>10); 1462 1463 // FIXME: GlobalMemoryStatus() may return incorrect value if total memory 1464 // is larger than 4GB 1465 MEMORYSTATUS ms; 1466 GlobalMemoryStatus(&ms); 1467 1468 st->print(", physical %uk", os::physical_memory() >> 10); 1469 st->print("(%uk free)", os::available_memory() >> 10); 1470 1471 st->print(", swap %uk", ms.dwTotalPageFile >> 10); 1472 st->print("(%uk free)", ms.dwAvailPageFile >> 10); 1473 st->cr(); 1474} 1475 1476void os::print_siginfo(outputStream *st, void *siginfo) { 1477 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1478 st->print("siginfo:"); 1479 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1480 1481 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1482 er->NumberParameters >= 2) { 1483 switch (er->ExceptionInformation[0]) { 1484 case 0: st->print(", reading address"); break; 1485 case 1: st->print(", writing address"); break; 1486 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1487 er->ExceptionInformation[0]); 1488 } 1489 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1490 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1491 er->NumberParameters >= 2 && UseSharedSpaces) { 1492 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1493 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1494 st->print("\n\nError accessing class data sharing archive." \ 1495 " Mapped file inaccessible during execution, " \ 1496 " possible disk/network problem."); 1497 } 1498 } else { 1499 int num = er->NumberParameters; 1500 if (num > 0) { 1501 st->print(", ExceptionInformation="); 1502 for (int i = 0; i < num; i++) { 1503 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1504 } 1505 } 1506 } 1507 st->cr(); 1508} 1509 1510void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1511 // do nothing 1512} 1513 1514static char saved_jvm_path[MAX_PATH] = {0}; 1515 1516// Find the full path to the current module, jvm.dll or jvm_g.dll 1517void os::jvm_path(char *buf, jint buflen) { 1518 // Error checking. 1519 if (buflen < MAX_PATH) { 1520 assert(false, "must use a large-enough buffer"); 1521 buf[0] = '\0'; 1522 return; 1523 } 1524 // Lazy resolve the path to current module. 1525 if (saved_jvm_path[0] != 0) { 1526 strcpy(buf, saved_jvm_path); 1527 return; 1528 } 1529 1530 GetModuleFileName(vm_lib_handle, buf, buflen); 1531 strcpy(saved_jvm_path, buf); 1532} 1533 1534 1535void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1536#ifndef _WIN64 1537 st->print("_"); 1538#endif 1539} 1540 1541 1542void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1543#ifndef _WIN64 1544 st->print("@%d", args_size * sizeof(int)); 1545#endif 1546} 1547 1548// sun.misc.Signal 1549// NOTE that this is a workaround for an apparent kernel bug where if 1550// a signal handler for SIGBREAK is installed then that signal handler 1551// takes priority over the console control handler for CTRL_CLOSE_EVENT. 1552// See bug 4416763. 1553static void (*sigbreakHandler)(int) = NULL; 1554 1555static void UserHandler(int sig, void *siginfo, void *context) { 1556 os::signal_notify(sig); 1557 // We need to reinstate the signal handler each time... 1558 os::signal(sig, (void*)UserHandler); 1559} 1560 1561void* os::user_handler() { 1562 return (void*) UserHandler; 1563} 1564 1565void* os::signal(int signal_number, void* handler) { 1566 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1567 void (*oldHandler)(int) = sigbreakHandler; 1568 sigbreakHandler = (void (*)(int)) handler; 1569 return (void*) oldHandler; 1570 } else { 1571 return (void*)::signal(signal_number, (void (*)(int))handler); 1572 } 1573} 1574 1575void os::signal_raise(int signal_number) { 1576 raise(signal_number); 1577} 1578 1579// The Win32 C runtime library maps all console control events other than ^C 1580// into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1581// logoff, and shutdown events. We therefore install our own console handler 1582// that raises SIGTERM for the latter cases. 1583// 1584static BOOL WINAPI consoleHandler(DWORD event) { 1585 switch(event) { 1586 case CTRL_C_EVENT: 1587 if (is_error_reported()) { 1588 // Ctrl-C is pressed during error reporting, likely because the error 1589 // handler fails to abort. Let VM die immediately. 1590 os::die(); 1591 } 1592 1593 os::signal_raise(SIGINT); 1594 return TRUE; 1595 break; 1596 case CTRL_BREAK_EVENT: 1597 if (sigbreakHandler != NULL) { 1598 (*sigbreakHandler)(SIGBREAK); 1599 } 1600 return TRUE; 1601 break; 1602 case CTRL_CLOSE_EVENT: 1603 case CTRL_LOGOFF_EVENT: 1604 case CTRL_SHUTDOWN_EVENT: 1605 os::signal_raise(SIGTERM); 1606 return TRUE; 1607 break; 1608 default: 1609 break; 1610 } 1611 return FALSE; 1612} 1613 1614/* 1615 * The following code is moved from os.cpp for making this 1616 * code platform specific, which it is by its very nature. 1617 */ 1618 1619// Return maximum OS signal used + 1 for internal use only 1620// Used as exit signal for signal_thread 1621int os::sigexitnum_pd(){ 1622 return NSIG; 1623} 1624 1625// a counter for each possible signal value, including signal_thread exit signal 1626static volatile jint pending_signals[NSIG+1] = { 0 }; 1627static HANDLE sig_sem; 1628 1629void os::signal_init_pd() { 1630 // Initialize signal structures 1631 memset((void*)pending_signals, 0, sizeof(pending_signals)); 1632 1633 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 1634 1635 // Programs embedding the VM do not want it to attempt to receive 1636 // events like CTRL_LOGOFF_EVENT, which are used to implement the 1637 // shutdown hooks mechanism introduced in 1.3. For example, when 1638 // the VM is run as part of a Windows NT service (i.e., a servlet 1639 // engine in a web server), the correct behavior is for any console 1640 // control handler to return FALSE, not TRUE, because the OS's 1641 // "final" handler for such events allows the process to continue if 1642 // it is a service (while terminating it if it is not a service). 1643 // To make this behavior uniform and the mechanism simpler, we 1644 // completely disable the VM's usage of these console events if -Xrs 1645 // (=ReduceSignalUsage) is specified. This means, for example, that 1646 // the CTRL-BREAK thread dump mechanism is also disabled in this 1647 // case. See bugs 4323062, 4345157, and related bugs. 1648 1649 if (!ReduceSignalUsage) { 1650 // Add a CTRL-C handler 1651 SetConsoleCtrlHandler(consoleHandler, TRUE); 1652 } 1653} 1654 1655void os::signal_notify(int signal_number) { 1656 BOOL ret; 1657 1658 Atomic::inc(&pending_signals[signal_number]); 1659 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 1660 assert(ret != 0, "ReleaseSemaphore() failed"); 1661} 1662 1663static int check_pending_signals(bool wait_for_signal) { 1664 DWORD ret; 1665 while (true) { 1666 for (int i = 0; i < NSIG + 1; i++) { 1667 jint n = pending_signals[i]; 1668 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1669 return i; 1670 } 1671 } 1672 if (!wait_for_signal) { 1673 return -1; 1674 } 1675 1676 JavaThread *thread = JavaThread::current(); 1677 1678 ThreadBlockInVM tbivm(thread); 1679 1680 bool threadIsSuspended; 1681 do { 1682 thread->set_suspend_equivalent(); 1683 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1684 ret = ::WaitForSingleObject(sig_sem, INFINITE); 1685 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 1686 1687 // were we externally suspended while we were waiting? 1688 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1689 if (threadIsSuspended) { 1690 // 1691 // The semaphore has been incremented, but while we were waiting 1692 // another thread suspended us. We don't want to continue running 1693 // while suspended because that would surprise the thread that 1694 // suspended us. 1695 // 1696 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 1697 assert(ret != 0, "ReleaseSemaphore() failed"); 1698 1699 thread->java_suspend_self(); 1700 } 1701 } while (threadIsSuspended); 1702 } 1703} 1704 1705int os::signal_lookup() { 1706 return check_pending_signals(false); 1707} 1708 1709int os::signal_wait() { 1710 return check_pending_signals(true); 1711} 1712 1713// Implicit OS exception handling 1714 1715LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) { 1716 JavaThread* thread = JavaThread::current(); 1717 // Save pc in thread 1718#ifdef _M_IA64 1719 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP); 1720 // Set pc to handler 1721 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 1722#elif _M_AMD64 1723 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip); 1724 // Set pc to handler 1725 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 1726#else 1727 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip); 1728 // Set pc to handler 1729 exceptionInfo->ContextRecord->Eip = (LONG)handler; 1730#endif 1731 1732 // Continue the execution 1733 return EXCEPTION_CONTINUE_EXECUTION; 1734} 1735 1736 1737// Used for PostMortemDump 1738extern "C" void safepoints(); 1739extern "C" void find(int x); 1740extern "C" void events(); 1741 1742// According to Windows API documentation, an illegal instruction sequence should generate 1743// the 0xC000001C exception code. However, real world experience shows that occasionnaly 1744// the execution of an illegal instruction can generate the exception code 0xC000001E. This 1745// seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 1746 1747#define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 1748 1749// From "Execution Protection in the Windows Operating System" draft 0.35 1750// Once a system header becomes available, the "real" define should be 1751// included or copied here. 1752#define EXCEPTION_INFO_EXEC_VIOLATION 0x08 1753 1754#define def_excpt(val) #val, val 1755 1756struct siglabel { 1757 char *name; 1758 int number; 1759}; 1760 1761struct siglabel exceptlabels[] = { 1762 def_excpt(EXCEPTION_ACCESS_VIOLATION), 1763 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 1764 def_excpt(EXCEPTION_BREAKPOINT), 1765 def_excpt(EXCEPTION_SINGLE_STEP), 1766 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 1767 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 1768 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 1769 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 1770 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 1771 def_excpt(EXCEPTION_FLT_OVERFLOW), 1772 def_excpt(EXCEPTION_FLT_STACK_CHECK), 1773 def_excpt(EXCEPTION_FLT_UNDERFLOW), 1774 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 1775 def_excpt(EXCEPTION_INT_OVERFLOW), 1776 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 1777 def_excpt(EXCEPTION_IN_PAGE_ERROR), 1778 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 1779 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 1780 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 1781 def_excpt(EXCEPTION_STACK_OVERFLOW), 1782 def_excpt(EXCEPTION_INVALID_DISPOSITION), 1783 def_excpt(EXCEPTION_GUARD_PAGE), 1784 def_excpt(EXCEPTION_INVALID_HANDLE), 1785 NULL, 0 1786}; 1787 1788const char* os::exception_name(int exception_code, char *buf, size_t size) { 1789 for (int i = 0; exceptlabels[i].name != NULL; i++) { 1790 if (exceptlabels[i].number == exception_code) { 1791 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 1792 return buf; 1793 } 1794 } 1795 1796 return NULL; 1797} 1798 1799//----------------------------------------------------------------------------- 1800LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 1801 // handle exception caused by idiv; should only happen for -MinInt/-1 1802 // (division by zero is handled explicitly) 1803#ifdef _M_IA64 1804 assert(0, "Fix Handle_IDiv_Exception"); 1805#elif _M_AMD64 1806 PCONTEXT ctx = exceptionInfo->ContextRecord; 1807 address pc = (address)ctx->Rip; 1808 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc)); 1809 assert(pc[0] == 0xF7, "not an idiv opcode"); 1810 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 1811 assert(ctx->Rax == min_jint, "unexpected idiv exception"); 1812 // set correct result values and continue after idiv instruction 1813 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 1814 ctx->Rax = (DWORD)min_jint; // result 1815 ctx->Rdx = (DWORD)0; // remainder 1816 // Continue the execution 1817#else 1818 PCONTEXT ctx = exceptionInfo->ContextRecord; 1819 address pc = (address)ctx->Eip; 1820 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc)); 1821 assert(pc[0] == 0xF7, "not an idiv opcode"); 1822 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 1823 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 1824 // set correct result values and continue after idiv instruction 1825 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 1826 ctx->Eax = (DWORD)min_jint; // result 1827 ctx->Edx = (DWORD)0; // remainder 1828 // Continue the execution 1829#endif 1830 return EXCEPTION_CONTINUE_EXECUTION; 1831} 1832 1833#ifndef _WIN64 1834//----------------------------------------------------------------------------- 1835LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 1836 // handle exception caused by native mothod modifying control word 1837 PCONTEXT ctx = exceptionInfo->ContextRecord; 1838 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 1839 1840 switch (exception_code) { 1841 case EXCEPTION_FLT_DENORMAL_OPERAND: 1842 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 1843 case EXCEPTION_FLT_INEXACT_RESULT: 1844 case EXCEPTION_FLT_INVALID_OPERATION: 1845 case EXCEPTION_FLT_OVERFLOW: 1846 case EXCEPTION_FLT_STACK_CHECK: 1847 case EXCEPTION_FLT_UNDERFLOW: 1848 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 1849 if (fp_control_word != ctx->FloatSave.ControlWord) { 1850 // Restore FPCW and mask out FLT exceptions 1851 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 1852 // Mask out pending FLT exceptions 1853 ctx->FloatSave.StatusWord &= 0xffffff00; 1854 return EXCEPTION_CONTINUE_EXECUTION; 1855 } 1856 } 1857 return EXCEPTION_CONTINUE_SEARCH; 1858} 1859#else //_WIN64 1860/* 1861 On Windows, the mxcsr control bits are non-volatile across calls 1862 See also CR 6192333 1863 If EXCEPTION_FLT_* happened after some native method modified 1864 mxcsr - it is not a jvm fault. 1865 However should we decide to restore of mxcsr after a faulty 1866 native method we can uncomment following code 1867 jint MxCsr = INITIAL_MXCSR; 1868 // we can't use StubRoutines::addr_mxcsr_std() 1869 // because in Win64 mxcsr is not saved there 1870 if (MxCsr != ctx->MxCsr) { 1871 ctx->MxCsr = MxCsr; 1872 return EXCEPTION_CONTINUE_EXECUTION; 1873 } 1874 1875*/ 1876#endif //_WIN64 1877 1878 1879// Fatal error reporting is single threaded so we can make this a 1880// static and preallocated. If it's more than MAX_PATH silently ignore 1881// it. 1882static char saved_error_file[MAX_PATH] = {0}; 1883 1884void os::set_error_file(const char *logfile) { 1885 if (strlen(logfile) <= MAX_PATH) { 1886 strncpy(saved_error_file, logfile, MAX_PATH); 1887 } 1888} 1889 1890static inline void report_error(Thread* t, DWORD exception_code, 1891 address addr, void* siginfo, void* context) { 1892 VMError err(t, exception_code, addr, siginfo, context); 1893 err.report_and_die(); 1894 1895 // If UseOsErrorReporting, this will return here and save the error file 1896 // somewhere where we can find it in the minidump. 1897} 1898 1899//----------------------------------------------------------------------------- 1900LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 1901 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 1902 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 1903#ifdef _M_IA64 1904 address pc = (address) exceptionInfo->ContextRecord->StIIP; 1905#elif _M_AMD64 1906 address pc = (address) exceptionInfo->ContextRecord->Rip; 1907#else 1908 address pc = (address) exceptionInfo->ContextRecord->Eip; 1909#endif 1910 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 1911 1912#ifndef _WIN64 1913 // Execution protection violation - win32 running on AMD64 only 1914 // Handled first to avoid misdiagnosis as a "normal" access violation; 1915 // This is safe to do because we have a new/unique ExceptionInformation 1916 // code for this condition. 1917 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 1918 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 1919 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 1920 address addr = (address) exceptionRecord->ExceptionInformation[1]; 1921 1922 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 1923 int page_size = os::vm_page_size(); 1924 1925 // Make sure the pc and the faulting address are sane. 1926 // 1927 // If an instruction spans a page boundary, and the page containing 1928 // the beginning of the instruction is executable but the following 1929 // page is not, the pc and the faulting address might be slightly 1930 // different - we still want to unguard the 2nd page in this case. 1931 // 1932 // 15 bytes seems to be a (very) safe value for max instruction size. 1933 bool pc_is_near_addr = 1934 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 1935 bool instr_spans_page_boundary = 1936 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 1937 (intptr_t) page_size) > 0); 1938 1939 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 1940 static volatile address last_addr = 1941 (address) os::non_memory_address_word(); 1942 1943 // In conservative mode, don't unguard unless the address is in the VM 1944 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 1945 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 1946 1947 // Unguard and retry 1948 address page_start = 1949 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 1950 bool res = os::unguard_memory((char*) page_start, page_size); 1951 1952 if (PrintMiscellaneous && Verbose) { 1953 char buf[256]; 1954 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 1955 "at " INTPTR_FORMAT 1956 ", unguarding " INTPTR_FORMAT ": %s", addr, 1957 page_start, (res ? "success" : strerror(errno))); 1958 tty->print_raw_cr(buf); 1959 } 1960 1961 // Set last_addr so if we fault again at the same address, we don't 1962 // end up in an endless loop. 1963 // 1964 // There are two potential complications here. Two threads trapping 1965 // at the same address at the same time could cause one of the 1966 // threads to think it already unguarded, and abort the VM. Likely 1967 // very rare. 1968 // 1969 // The other race involves two threads alternately trapping at 1970 // different addresses and failing to unguard the page, resulting in 1971 // an endless loop. This condition is probably even more unlikely 1972 // than the first. 1973 // 1974 // Although both cases could be avoided by using locks or thread 1975 // local last_addr, these solutions are unnecessary complication: 1976 // this handler is a best-effort safety net, not a complete solution. 1977 // It is disabled by default and should only be used as a workaround 1978 // in case we missed any no-execute-unsafe VM code. 1979 1980 last_addr = addr; 1981 1982 return EXCEPTION_CONTINUE_EXECUTION; 1983 } 1984 } 1985 1986 // Last unguard failed or not unguarding 1987 tty->print_raw_cr("Execution protection violation"); 1988 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 1989 exceptionInfo->ContextRecord); 1990 return EXCEPTION_CONTINUE_SEARCH; 1991 } 1992 } 1993#endif // _WIN64 1994 1995 // Check to see if we caught the safepoint code in the 1996 // process of write protecting the memory serialization page. 1997 // It write enables the page immediately after protecting it 1998 // so just return. 1999 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { 2000 JavaThread* thread = (JavaThread*) t; 2001 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2002 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2003 if ( os::is_memory_serialize_page(thread, addr) ) { 2004 // Block current thread until the memory serialize page permission restored. 2005 os::block_on_serialize_page_trap(); 2006 return EXCEPTION_CONTINUE_EXECUTION; 2007 } 2008 } 2009 2010 2011 if (t != NULL && t->is_Java_thread()) { 2012 JavaThread* thread = (JavaThread*) t; 2013 bool in_java = thread->thread_state() == _thread_in_Java; 2014 2015 // Handle potential stack overflows up front. 2016 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2017 if (os::uses_stack_guard_pages()) { 2018#ifdef _M_IA64 2019 // 2020 // If it's a legal stack address continue, Windows will map it in. 2021 // 2022 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2023 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2024 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) 2025 return EXCEPTION_CONTINUE_EXECUTION; 2026 2027 // The register save area is the same size as the memory stack 2028 // and starts at the page just above the start of the memory stack. 2029 // If we get a fault in this area, we've run out of register 2030 // stack. If we are in java, try throwing a stack overflow exception. 2031 if (addr > thread->stack_base() && 2032 addr <= (thread->stack_base()+thread->stack_size()) ) { 2033 char buf[256]; 2034 jio_snprintf(buf, sizeof(buf), 2035 "Register stack overflow, addr:%p, stack_base:%p\n", 2036 addr, thread->stack_base() ); 2037 tty->print_raw_cr(buf); 2038 // If not in java code, return and hope for the best. 2039 return in_java ? Handle_Exception(exceptionInfo, 2040 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2041 : EXCEPTION_CONTINUE_EXECUTION; 2042 } 2043#endif 2044 if (thread->stack_yellow_zone_enabled()) { 2045 // Yellow zone violation. The o/s has unprotected the first yellow 2046 // zone page for us. Note: must call disable_stack_yellow_zone to 2047 // update the enabled status, even if the zone contains only one page. 2048 thread->disable_stack_yellow_zone(); 2049 // If not in java code, return and hope for the best. 2050 return in_java ? Handle_Exception(exceptionInfo, 2051 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2052 : EXCEPTION_CONTINUE_EXECUTION; 2053 } else { 2054 // Fatal red zone violation. 2055 thread->disable_stack_red_zone(); 2056 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2057 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2058 exceptionInfo->ContextRecord); 2059 return EXCEPTION_CONTINUE_SEARCH; 2060 } 2061 } else if (in_java) { 2062 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2063 // a one-time-only guard page, which it has released to us. The next 2064 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2065 return Handle_Exception(exceptionInfo, 2066 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2067 } else { 2068 // Can only return and hope for the best. Further stack growth will 2069 // result in an ACCESS_VIOLATION. 2070 return EXCEPTION_CONTINUE_EXECUTION; 2071 } 2072 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2073 // Either stack overflow or null pointer exception. 2074 if (in_java) { 2075 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2076 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2077 address stack_end = thread->stack_base() - thread->stack_size(); 2078 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2079 // Stack overflow. 2080 assert(!os::uses_stack_guard_pages(), 2081 "should be caught by red zone code above."); 2082 return Handle_Exception(exceptionInfo, 2083 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2084 } 2085 // 2086 // Check for safepoint polling and implicit null 2087 // We only expect null pointers in the stubs (vtable) 2088 // the rest are checked explicitly now. 2089 // 2090 CodeBlob* cb = CodeCache::find_blob(pc); 2091 if (cb != NULL) { 2092 if (os::is_poll_address(addr)) { 2093 address stub = SharedRuntime::get_poll_stub(pc); 2094 return Handle_Exception(exceptionInfo, stub); 2095 } 2096 } 2097 { 2098#ifdef _WIN64 2099 // 2100 // If it's a legal stack address map the entire region in 2101 // 2102 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2103 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2104 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) { 2105 addr = (address)((uintptr_t)addr & 2106 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2107 os::commit_memory( (char *)addr, thread->stack_base() - addr ); 2108 return EXCEPTION_CONTINUE_EXECUTION; 2109 } 2110 else 2111#endif 2112 { 2113 // Null pointer exception. 2114#ifdef _M_IA64 2115 // We catch register stack overflows in compiled code by doing 2116 // an explicit compare and executing a st8(G0, G0) if the 2117 // BSP enters into our guard area. We test for the overflow 2118 // condition and fall into the normal null pointer exception 2119 // code if BSP hasn't overflowed. 2120 if ( in_java ) { 2121 if(thread->register_stack_overflow()) { 2122 assert((address)exceptionInfo->ContextRecord->IntS3 == 2123 thread->register_stack_limit(), 2124 "GR7 doesn't contain register_stack_limit"); 2125 // Disable the yellow zone which sets the state that 2126 // we've got a stack overflow problem. 2127 if (thread->stack_yellow_zone_enabled()) { 2128 thread->disable_stack_yellow_zone(); 2129 } 2130 // Give us some room to process the exception 2131 thread->disable_register_stack_guard(); 2132 // Update GR7 with the new limit so we can continue running 2133 // compiled code. 2134 exceptionInfo->ContextRecord->IntS3 = 2135 (ULONGLONG)thread->register_stack_limit(); 2136 return Handle_Exception(exceptionInfo, 2137 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2138 } else { 2139 // 2140 // Check for implicit null 2141 // We only expect null pointers in the stubs (vtable) 2142 // the rest are checked explicitly now. 2143 // 2144 CodeBlob* cb = CodeCache::find_blob(pc); 2145 if (cb != NULL) { 2146 if (VtableStubs::stub_containing(pc) != NULL) { 2147 if (((uintptr_t)addr) < os::vm_page_size() ) { 2148 // an access to the first page of VM--assume it is a null pointer 2149 return Handle_Exception(exceptionInfo, 2150 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL)); 2151 } 2152 } 2153 } 2154 } 2155 } // in_java 2156 2157 // IA64 doesn't use implicit null checking yet. So we shouldn't 2158 // get here. 2159 tty->print_raw_cr("Access violation, possible null pointer exception"); 2160 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2161 exceptionInfo->ContextRecord); 2162 return EXCEPTION_CONTINUE_SEARCH; 2163#else /* !IA64 */ 2164 2165 // Windows 98 reports faulting addresses incorrectly 2166 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2167 !os::win32::is_nt()) { 2168 return Handle_Exception(exceptionInfo, 2169 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL)); 2170 } 2171 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2172 exceptionInfo->ContextRecord); 2173 return EXCEPTION_CONTINUE_SEARCH; 2174#endif 2175 } 2176 } 2177 } 2178 2179#ifdef _WIN64 2180 // Special care for fast JNI field accessors. 2181 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2182 // in and the heap gets shrunk before the field access. 2183 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2184 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2185 if (addr != (address)-1) { 2186 return Handle_Exception(exceptionInfo, addr); 2187 } 2188 } 2189#endif 2190 2191#ifdef _WIN64 2192 // Windows will sometimes generate an access violation 2193 // when we call malloc. Since we use VectoredExceptions 2194 // on 64 bit platforms, we see this exception. We must 2195 // pass this exception on so Windows can recover. 2196 // We check to see if the pc of the fault is in NTDLL.DLL 2197 // if so, we pass control on to Windows for handling. 2198 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH; 2199#endif 2200 2201 // Stack overflow or null pointer exception in native code. 2202 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2203 exceptionInfo->ContextRecord); 2204 return EXCEPTION_CONTINUE_SEARCH; 2205 } 2206 2207 if (in_java) { 2208 switch (exception_code) { 2209 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2210 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2211 2212 case EXCEPTION_INT_OVERFLOW: 2213 return Handle_IDiv_Exception(exceptionInfo); 2214 2215 } // switch 2216 } 2217#ifndef _WIN64 2218 if ((thread->thread_state() == _thread_in_Java) || 2219 (thread->thread_state() == _thread_in_native) ) 2220 { 2221 LONG result=Handle_FLT_Exception(exceptionInfo); 2222 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2223 } 2224#endif //_WIN64 2225 } 2226 2227 if (exception_code != EXCEPTION_BREAKPOINT) { 2228#ifndef _WIN64 2229 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2230 exceptionInfo->ContextRecord); 2231#else 2232 // Itanium Windows uses a VectoredExceptionHandler 2233 // Which means that C++ programatic exception handlers (try/except) 2234 // will get here. Continue the search for the right except block if 2235 // the exception code is not a fatal code. 2236 switch ( exception_code ) { 2237 case EXCEPTION_ACCESS_VIOLATION: 2238 case EXCEPTION_STACK_OVERFLOW: 2239 case EXCEPTION_ILLEGAL_INSTRUCTION: 2240 case EXCEPTION_ILLEGAL_INSTRUCTION_2: 2241 case EXCEPTION_INT_OVERFLOW: 2242 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2243 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2244 exceptionInfo->ContextRecord); 2245 } 2246 break; 2247 default: 2248 break; 2249 } 2250#endif 2251 } 2252 return EXCEPTION_CONTINUE_SEARCH; 2253} 2254 2255#ifndef _WIN64 2256// Special care for fast JNI accessors. 2257// jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2258// the heap gets shrunk before the field access. 2259// Need to install our own structured exception handler since native code may 2260// install its own. 2261LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2262 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2263 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2264 address pc = (address) exceptionInfo->ContextRecord->Eip; 2265 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2266 if (addr != (address)-1) { 2267 return Handle_Exception(exceptionInfo, addr); 2268 } 2269 } 2270 return EXCEPTION_CONTINUE_SEARCH; 2271} 2272 2273#define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \ 2274Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \ 2275 __try { \ 2276 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \ 2277 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \ 2278 } \ 2279 return 0; \ 2280} 2281 2282DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2283DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2284DEFINE_FAST_GETFIELD(jchar, char, Char) 2285DEFINE_FAST_GETFIELD(jshort, short, Short) 2286DEFINE_FAST_GETFIELD(jint, int, Int) 2287DEFINE_FAST_GETFIELD(jlong, long, Long) 2288DEFINE_FAST_GETFIELD(jfloat, float, Float) 2289DEFINE_FAST_GETFIELD(jdouble, double, Double) 2290 2291address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2292 switch (type) { 2293 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2294 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2295 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2296 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2297 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2298 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2299 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2300 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2301 default: ShouldNotReachHere(); 2302 } 2303 return (address)-1; 2304} 2305#endif 2306 2307// Virtual Memory 2308 2309int os::vm_page_size() { return os::win32::vm_page_size(); } 2310int os::vm_allocation_granularity() { 2311 return os::win32::vm_allocation_granularity(); 2312} 2313 2314// Windows large page support is available on Windows 2003. In order to use 2315// large page memory, the administrator must first assign additional privilege 2316// to the user: 2317// + select Control Panel -> Administrative Tools -> Local Security Policy 2318// + select Local Policies -> User Rights Assignment 2319// + double click "Lock pages in memory", add users and/or groups 2320// + reboot 2321// Note the above steps are needed for administrator as well, as administrators 2322// by default do not have the privilege to lock pages in memory. 2323// 2324// Note about Windows 2003: although the API supports committing large page 2325// memory on a page-by-page basis and VirtualAlloc() returns success under this 2326// scenario, I found through experiment it only uses large page if the entire 2327// memory region is reserved and committed in a single VirtualAlloc() call. 2328// This makes Windows large page support more or less like Solaris ISM, in 2329// that the entire heap must be committed upfront. This probably will change 2330// in the future, if so the code below needs to be revisited. 2331 2332#ifndef MEM_LARGE_PAGES 2333#define MEM_LARGE_PAGES 0x20000000 2334#endif 2335 2336// GetLargePageMinimum is only available on Windows 2003. The other functions 2337// are available on NT but not on Windows 98/Me. We have to resolve them at 2338// runtime. 2339typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void); 2340typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type) 2341 (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 2342typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE); 2343typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID); 2344 2345static GetLargePageMinimum_func_type _GetLargePageMinimum; 2346static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges; 2347static OpenProcessToken_func_type _OpenProcessToken; 2348static LookupPrivilegeValue_func_type _LookupPrivilegeValue; 2349 2350static HINSTANCE _kernel32; 2351static HINSTANCE _advapi32; 2352static HANDLE _hProcess; 2353static HANDLE _hToken; 2354 2355static size_t _large_page_size = 0; 2356 2357static bool resolve_functions_for_large_page_init() { 2358 _kernel32 = LoadLibrary("kernel32.dll"); 2359 if (_kernel32 == NULL) return false; 2360 2361 _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type, 2362 GetProcAddress(_kernel32, "GetLargePageMinimum")); 2363 if (_GetLargePageMinimum == NULL) return false; 2364 2365 _advapi32 = LoadLibrary("advapi32.dll"); 2366 if (_advapi32 == NULL) return false; 2367 2368 _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type, 2369 GetProcAddress(_advapi32, "AdjustTokenPrivileges")); 2370 _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type, 2371 GetProcAddress(_advapi32, "OpenProcessToken")); 2372 _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type, 2373 GetProcAddress(_advapi32, "LookupPrivilegeValueA")); 2374 return _AdjustTokenPrivileges != NULL && 2375 _OpenProcessToken != NULL && 2376 _LookupPrivilegeValue != NULL; 2377} 2378 2379static bool request_lock_memory_privilege() { 2380 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2381 os::current_process_id()); 2382 2383 LUID luid; 2384 if (_hProcess != NULL && 2385 _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2386 _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2387 2388 TOKEN_PRIVILEGES tp; 2389 tp.PrivilegeCount = 1; 2390 tp.Privileges[0].Luid = luid; 2391 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2392 2393 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2394 // privilege. Check GetLastError() too. See MSDN document. 2395 if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2396 (GetLastError() == ERROR_SUCCESS)) { 2397 return true; 2398 } 2399 } 2400 2401 return false; 2402} 2403 2404static void cleanup_after_large_page_init() { 2405 _GetLargePageMinimum = NULL; 2406 _AdjustTokenPrivileges = NULL; 2407 _OpenProcessToken = NULL; 2408 _LookupPrivilegeValue = NULL; 2409 if (_kernel32) FreeLibrary(_kernel32); 2410 _kernel32 = NULL; 2411 if (_advapi32) FreeLibrary(_advapi32); 2412 _advapi32 = NULL; 2413 if (_hProcess) CloseHandle(_hProcess); 2414 _hProcess = NULL; 2415 if (_hToken) CloseHandle(_hToken); 2416 _hToken = NULL; 2417} 2418 2419bool os::large_page_init() { 2420 if (!UseLargePages) return false; 2421 2422 // print a warning if any large page related flag is specified on command line 2423 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2424 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2425 bool success = false; 2426 2427# define WARN(msg) if (warn_on_failure) { warning(msg); } 2428 if (resolve_functions_for_large_page_init()) { 2429 if (request_lock_memory_privilege()) { 2430 size_t s = _GetLargePageMinimum(); 2431 if (s) { 2432#if defined(IA32) || defined(AMD64) 2433 if (s > 4*M || LargePageSizeInBytes > 4*M) { 2434 WARN("JVM cannot use large pages bigger than 4mb."); 2435 } else { 2436#endif 2437 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 2438 _large_page_size = LargePageSizeInBytes; 2439 } else { 2440 _large_page_size = s; 2441 } 2442 success = true; 2443#if defined(IA32) || defined(AMD64) 2444 } 2445#endif 2446 } else { 2447 WARN("Large page is not supported by the processor."); 2448 } 2449 } else { 2450 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 2451 } 2452 } else { 2453 WARN("Large page is not supported by the operating system."); 2454 } 2455#undef WARN 2456 2457 const size_t default_page_size = (size_t) vm_page_size(); 2458 if (success && _large_page_size > default_page_size) { 2459 _page_sizes[0] = _large_page_size; 2460 _page_sizes[1] = default_page_size; 2461 _page_sizes[2] = 0; 2462 } 2463 2464 cleanup_after_large_page_init(); 2465 return success; 2466} 2467 2468// On win32, one cannot release just a part of reserved memory, it's an 2469// all or nothing deal. When we split a reservation, we must break the 2470// reservation into two reservations. 2471void os::split_reserved_memory(char *base, size_t size, size_t split, 2472 bool realloc) { 2473 if (size > 0) { 2474 release_memory(base, size); 2475 if (realloc) { 2476 reserve_memory(split, base); 2477 } 2478 if (size != split) { 2479 reserve_memory(size - split, base + split); 2480 } 2481 } 2482} 2483 2484char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 2485 assert((size_t)addr % os::vm_allocation_granularity() == 0, 2486 "reserve alignment"); 2487 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size"); 2488 char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, 2489 PAGE_EXECUTE_READWRITE); 2490 assert(res == NULL || addr == NULL || addr == res, 2491 "Unexpected address from reserve."); 2492 return res; 2493} 2494 2495// Reserve memory at an arbitrary address, only if that area is 2496// available (and not reserved for something else). 2497char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2498 // Windows os::reserve_memory() fails of the requested address range is 2499 // not avilable. 2500 return reserve_memory(bytes, requested_addr); 2501} 2502 2503size_t os::large_page_size() { 2504 return _large_page_size; 2505} 2506 2507bool os::can_commit_large_page_memory() { 2508 // Windows only uses large page memory when the entire region is reserved 2509 // and committed in a single VirtualAlloc() call. This may change in the 2510 // future, but with Windows 2003 it's not possible to commit on demand. 2511 return false; 2512} 2513 2514char* os::reserve_memory_special(size_t bytes) { 2515 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 2516 char * res = (char *)VirtualAlloc(NULL, bytes, flag, PAGE_READWRITE); 2517 return res; 2518} 2519 2520bool os::release_memory_special(char* base, size_t bytes) { 2521 return release_memory(base, bytes); 2522} 2523 2524void os::print_statistics() { 2525} 2526 2527bool os::commit_memory(char* addr, size_t bytes) { 2528 if (bytes == 0) { 2529 // Don't bother the OS with noops. 2530 return true; 2531 } 2532 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 2533 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 2534 // Don't attempt to print anything if the OS call fails. We're 2535 // probably low on resources, so the print itself may cause crashes. 2536 return VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_EXECUTE_READWRITE) != NULL; 2537} 2538 2539bool os::commit_memory(char* addr, size_t size, size_t alignment_hint) { 2540 return commit_memory(addr, size); 2541} 2542 2543bool os::uncommit_memory(char* addr, size_t bytes) { 2544 if (bytes == 0) { 2545 // Don't bother the OS with noops. 2546 return true; 2547 } 2548 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 2549 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 2550 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0; 2551} 2552 2553bool os::release_memory(char* addr, size_t bytes) { 2554 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 2555} 2556 2557bool os::protect_memory(char* addr, size_t bytes) { 2558 DWORD old_status; 2559 return VirtualProtect(addr, bytes, PAGE_READONLY, &old_status) != 0; 2560} 2561 2562bool os::guard_memory(char* addr, size_t bytes) { 2563 DWORD old_status; 2564 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE | PAGE_GUARD, &old_status) != 0; 2565} 2566 2567bool os::unguard_memory(char* addr, size_t bytes) { 2568 DWORD old_status; 2569 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &old_status) != 0; 2570} 2571 2572void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 2573void os::free_memory(char *addr, size_t bytes) { } 2574void os::numa_make_global(char *addr, size_t bytes) { } 2575void os::numa_make_local(char *addr, size_t bytes) { } 2576bool os::numa_topology_changed() { return false; } 2577size_t os::numa_get_groups_num() { return 1; } 2578int os::numa_get_group_id() { return 0; } 2579size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2580 if (size > 0) { 2581 ids[0] = 0; 2582 return 1; 2583 } 2584 return 0; 2585} 2586 2587bool os::get_page_info(char *start, page_info* info) { 2588 return false; 2589} 2590 2591char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2592 return end; 2593} 2594 2595char* os::non_memory_address_word() { 2596 // Must never look like an address returned by reserve_memory, 2597 // even in its subfields (as defined by the CPU immediate fields, 2598 // if the CPU splits constants across multiple instructions). 2599 return (char*)-1; 2600} 2601 2602#define MAX_ERROR_COUNT 100 2603#define SYS_THREAD_ERROR 0xffffffffUL 2604 2605void os::pd_start_thread(Thread* thread) { 2606 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 2607 // Returns previous suspend state: 2608 // 0: Thread was not suspended 2609 // 1: Thread is running now 2610 // >1: Thread is still suspended. 2611 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 2612} 2613 2614size_t os::read(int fd, void *buf, unsigned int nBytes) { 2615 return ::read(fd, buf, nBytes); 2616} 2617 2618class HighResolutionInterval { 2619 // The default timer resolution seems to be 10 milliseconds. 2620 // (Where is this written down?) 2621 // If someone wants to sleep for only a fraction of the default, 2622 // then we set the timer resolution down to 1 millisecond for 2623 // the duration of their interval. 2624 // We carefully set the resolution back, since otherwise we 2625 // seem to incur an overhead (3%?) that we don't need. 2626 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 2627 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 2628 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 2629 // timeBeginPeriod() if the relative error exceeded some threshold. 2630 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 2631 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 2632 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 2633 // resolution timers running. 2634private: 2635 jlong resolution; 2636public: 2637 HighResolutionInterval(jlong ms) { 2638 resolution = ms % 10L; 2639 if (resolution != 0) { 2640 MMRESULT result = timeBeginPeriod(1L); 2641 } 2642 } 2643 ~HighResolutionInterval() { 2644 if (resolution != 0) { 2645 MMRESULT result = timeEndPeriod(1L); 2646 } 2647 resolution = 0L; 2648 } 2649}; 2650 2651int os::sleep(Thread* thread, jlong ms, bool interruptable) { 2652 jlong limit = (jlong) MAXDWORD; 2653 2654 while(ms > limit) { 2655 int res; 2656 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) 2657 return res; 2658 ms -= limit; 2659 } 2660 2661 assert(thread == Thread::current(), "thread consistency check"); 2662 OSThread* osthread = thread->osthread(); 2663 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 2664 int result; 2665 if (interruptable) { 2666 assert(thread->is_Java_thread(), "must be java thread"); 2667 JavaThread *jt = (JavaThread *) thread; 2668 ThreadBlockInVM tbivm(jt); 2669 2670 jt->set_suspend_equivalent(); 2671 // cleared by handle_special_suspend_equivalent_condition() or 2672 // java_suspend_self() via check_and_wait_while_suspended() 2673 2674 HANDLE events[1]; 2675 events[0] = osthread->interrupt_event(); 2676 HighResolutionInterval *phri=NULL; 2677 if(!ForceTimeHighResolution) 2678 phri = new HighResolutionInterval( ms ); 2679 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 2680 result = OS_TIMEOUT; 2681 } else { 2682 ResetEvent(osthread->interrupt_event()); 2683 osthread->set_interrupted(false); 2684 result = OS_INTRPT; 2685 } 2686 delete phri; //if it is NULL, harmless 2687 2688 // were we externally suspended while we were waiting? 2689 jt->check_and_wait_while_suspended(); 2690 } else { 2691 assert(!thread->is_Java_thread(), "must not be java thread"); 2692 Sleep((long) ms); 2693 result = OS_TIMEOUT; 2694 } 2695 return result; 2696} 2697 2698// Sleep forever; naked call to OS-specific sleep; use with CAUTION 2699void os::infinite_sleep() { 2700 while (true) { // sleep forever ... 2701 Sleep(100000); // ... 100 seconds at a time 2702 } 2703} 2704 2705typedef BOOL (WINAPI * STTSignature)(void) ; 2706 2707os::YieldResult os::NakedYield() { 2708 // Use either SwitchToThread() or Sleep(0) 2709 // Consider passing back the return value from SwitchToThread(). 2710 // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread. 2711 // In that case we revert to Sleep(0). 2712 static volatile STTSignature stt = (STTSignature) 1 ; 2713 2714 if (stt == ((STTSignature) 1)) { 2715 stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ; 2716 // It's OK if threads race during initialization as the operation above is idempotent. 2717 } 2718 if (stt != NULL) { 2719 return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ; 2720 } else { 2721 Sleep (0) ; 2722 } 2723 return os::YIELD_UNKNOWN ; 2724} 2725 2726void os::yield() { os::NakedYield(); } 2727 2728void os::yield_all(int attempts) { 2729 // Yields to all threads, including threads with lower priorities 2730 Sleep(1); 2731} 2732 2733// Win32 only gives you access to seven real priorities at a time, 2734// so we compress Java's ten down to seven. It would be better 2735// if we dynamically adjusted relative priorities. 2736 2737int os::java_to_os_priority[MaxPriority + 1] = { 2738 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 2739 THREAD_PRIORITY_LOWEST, // 1 MinPriority 2740 THREAD_PRIORITY_LOWEST, // 2 2741 THREAD_PRIORITY_BELOW_NORMAL, // 3 2742 THREAD_PRIORITY_BELOW_NORMAL, // 4 2743 THREAD_PRIORITY_NORMAL, // 5 NormPriority 2744 THREAD_PRIORITY_NORMAL, // 6 2745 THREAD_PRIORITY_ABOVE_NORMAL, // 7 2746 THREAD_PRIORITY_ABOVE_NORMAL, // 8 2747 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 2748 THREAD_PRIORITY_HIGHEST // 10 MaxPriority 2749}; 2750 2751int prio_policy1[MaxPriority + 1] = { 2752 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 2753 THREAD_PRIORITY_LOWEST, // 1 MinPriority 2754 THREAD_PRIORITY_LOWEST, // 2 2755 THREAD_PRIORITY_BELOW_NORMAL, // 3 2756 THREAD_PRIORITY_BELOW_NORMAL, // 4 2757 THREAD_PRIORITY_NORMAL, // 5 NormPriority 2758 THREAD_PRIORITY_ABOVE_NORMAL, // 6 2759 THREAD_PRIORITY_ABOVE_NORMAL, // 7 2760 THREAD_PRIORITY_HIGHEST, // 8 2761 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 2762 THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority 2763}; 2764 2765static int prio_init() { 2766 // If ThreadPriorityPolicy is 1, switch tables 2767 if (ThreadPriorityPolicy == 1) { 2768 int i; 2769 for (i = 0; i < MaxPriority + 1; i++) { 2770 os::java_to_os_priority[i] = prio_policy1[i]; 2771 } 2772 } 2773 return 0; 2774} 2775 2776OSReturn os::set_native_priority(Thread* thread, int priority) { 2777 if (!UseThreadPriorities) return OS_OK; 2778 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 2779 return ret ? OS_OK : OS_ERR; 2780} 2781 2782OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) { 2783 if ( !UseThreadPriorities ) { 2784 *priority_ptr = java_to_os_priority[NormPriority]; 2785 return OS_OK; 2786 } 2787 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 2788 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 2789 assert(false, "GetThreadPriority failed"); 2790 return OS_ERR; 2791 } 2792 *priority_ptr = os_prio; 2793 return OS_OK; 2794} 2795 2796 2797// Hint to the underlying OS that a task switch would not be good. 2798// Void return because it's a hint and can fail. 2799void os::hint_no_preempt() {} 2800 2801void os::interrupt(Thread* thread) { 2802 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 2803 "possibility of dangling Thread pointer"); 2804 2805 OSThread* osthread = thread->osthread(); 2806 osthread->set_interrupted(true); 2807 // More than one thread can get here with the same value of osthread, 2808 // resulting in multiple notifications. We do, however, want the store 2809 // to interrupted() to be visible to other threads before we post 2810 // the interrupt event. 2811 OrderAccess::release(); 2812 SetEvent(osthread->interrupt_event()); 2813 // For JSR166: unpark after setting status 2814 if (thread->is_Java_thread()) 2815 ((JavaThread*)thread)->parker()->unpark(); 2816 2817 ParkEvent * ev = thread->_ParkEvent ; 2818 if (ev != NULL) ev->unpark() ; 2819 2820} 2821 2822 2823bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 2824 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 2825 "possibility of dangling Thread pointer"); 2826 2827 OSThread* osthread = thread->osthread(); 2828 bool interrupted; 2829 interrupted = osthread->interrupted(); 2830 if (clear_interrupted == true) { 2831 osthread->set_interrupted(false); 2832 ResetEvent(osthread->interrupt_event()); 2833 } // Otherwise leave the interrupted state alone 2834 2835 return interrupted; 2836} 2837 2838// Get's a pc (hint) for a running thread. Currently used only for profiling. 2839ExtendedPC os::get_thread_pc(Thread* thread) { 2840 CONTEXT context; 2841 context.ContextFlags = CONTEXT_CONTROL; 2842 HANDLE handle = thread->osthread()->thread_handle(); 2843#ifdef _M_IA64 2844 assert(0, "Fix get_thread_pc"); 2845 return ExtendedPC(NULL); 2846#else 2847 if (GetThreadContext(handle, &context)) { 2848#ifdef _M_AMD64 2849 return ExtendedPC((address) context.Rip); 2850#else 2851 return ExtendedPC((address) context.Eip); 2852#endif 2853 } else { 2854 return ExtendedPC(NULL); 2855 } 2856#endif 2857} 2858 2859// GetCurrentThreadId() returns DWORD 2860intx os::current_thread_id() { return GetCurrentThreadId(); } 2861 2862static int _initial_pid = 0; 2863 2864int os::current_process_id() 2865{ 2866 return (_initial_pid ? _initial_pid : _getpid()); 2867} 2868 2869int os::win32::_vm_page_size = 0; 2870int os::win32::_vm_allocation_granularity = 0; 2871int os::win32::_processor_type = 0; 2872// Processor level is not available on non-NT systems, use vm_version instead 2873int os::win32::_processor_level = 0; 2874julong os::win32::_physical_memory = 0; 2875size_t os::win32::_default_stack_size = 0; 2876 2877 intx os::win32::_os_thread_limit = 0; 2878volatile intx os::win32::_os_thread_count = 0; 2879 2880bool os::win32::_is_nt = false; 2881 2882 2883void os::win32::initialize_system_info() { 2884 SYSTEM_INFO si; 2885 GetSystemInfo(&si); 2886 _vm_page_size = si.dwPageSize; 2887 _vm_allocation_granularity = si.dwAllocationGranularity; 2888 _processor_type = si.dwProcessorType; 2889 _processor_level = si.wProcessorLevel; 2890 _processor_count = si.dwNumberOfProcessors; 2891 2892 MEMORYSTATUS ms; 2893 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 2894 // dwMemoryLoad (% of memory in use) 2895 GlobalMemoryStatus(&ms); 2896 _physical_memory = ms.dwTotalPhys; 2897 2898 OSVERSIONINFO oi; 2899 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); 2900 GetVersionEx(&oi); 2901 switch(oi.dwPlatformId) { 2902 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 2903 case VER_PLATFORM_WIN32_NT: _is_nt = true; break; 2904 default: fatal("Unknown platform"); 2905 } 2906 2907 _default_stack_size = os::current_stack_size(); 2908 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 2909 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 2910 "stack size not a multiple of page size"); 2911 2912 initialize_performance_counter(); 2913 2914 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is 2915 // known to deadlock the system, if the VM issues to thread operations with 2916 // a too high frequency, e.g., such as changing the priorities. 2917 // The 6000 seems to work well - no deadlocks has been notices on the test 2918 // programs that we have seen experience this problem. 2919 if (!os::win32::is_nt()) { 2920 StarvationMonitorInterval = 6000; 2921 } 2922} 2923 2924 2925void os::win32::setmode_streams() { 2926 _setmode(_fileno(stdin), _O_BINARY); 2927 _setmode(_fileno(stdout), _O_BINARY); 2928 _setmode(_fileno(stderr), _O_BINARY); 2929} 2930 2931 2932int os::message_box(const char* title, const char* message) { 2933 int result = MessageBox(NULL, message, title, 2934 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 2935 return result == IDYES; 2936} 2937 2938int os::allocate_thread_local_storage() { 2939 return TlsAlloc(); 2940} 2941 2942 2943void os::free_thread_local_storage(int index) { 2944 TlsFree(index); 2945} 2946 2947 2948void os::thread_local_storage_at_put(int index, void* value) { 2949 TlsSetValue(index, value); 2950 assert(thread_local_storage_at(index) == value, "Just checking"); 2951} 2952 2953 2954void* os::thread_local_storage_at(int index) { 2955 return TlsGetValue(index); 2956} 2957 2958 2959#ifndef PRODUCT 2960#ifndef _WIN64 2961// Helpers to check whether NX protection is enabled 2962int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 2963 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 2964 pex->ExceptionRecord->NumberParameters > 0 && 2965 pex->ExceptionRecord->ExceptionInformation[0] == 2966 EXCEPTION_INFO_EXEC_VIOLATION) { 2967 return EXCEPTION_EXECUTE_HANDLER; 2968 } 2969 return EXCEPTION_CONTINUE_SEARCH; 2970} 2971 2972void nx_check_protection() { 2973 // If NX is enabled we'll get an exception calling into code on the stack 2974 char code[] = { (char)0xC3 }; // ret 2975 void *code_ptr = (void *)code; 2976 __try { 2977 __asm call code_ptr 2978 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 2979 tty->print_raw_cr("NX protection detected."); 2980 } 2981} 2982#endif // _WIN64 2983#endif // PRODUCT 2984 2985// this is called _before_ the global arguments have been parsed 2986void os::init(void) { 2987 _initial_pid = _getpid(); 2988 2989 init_random(1234567); 2990 2991 win32::initialize_system_info(); 2992 win32::setmode_streams(); 2993 init_page_sizes((size_t) win32::vm_page_size()); 2994 2995 // For better scalability on MP systems (must be called after initialize_system_info) 2996#ifndef PRODUCT 2997 if (is_MP()) { 2998 NoYieldsInMicrolock = true; 2999 } 3000#endif 3001 // Initialize main_process and main_thread 3002 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 3003 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 3004 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 3005 fatal("DuplicateHandle failed\n"); 3006 } 3007 main_thread_id = (int) GetCurrentThreadId(); 3008} 3009 3010// To install functions for atexit processing 3011extern "C" { 3012 static void perfMemory_exit_helper() { 3013 perfMemory_exit(); 3014 } 3015} 3016 3017 3018// this is called _after_ the global arguments have been parsed 3019jint os::init_2(void) { 3020 // Allocate a single page and mark it as readable for safepoint polling 3021 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 3022 guarantee( polling_page != NULL, "Reserve Failed for polling page"); 3023 3024 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 3025 guarantee( return_page != NULL, "Commit Failed for polling page"); 3026 3027 os::set_polling_page( polling_page ); 3028 3029#ifndef PRODUCT 3030 if( Verbose && PrintMiscellaneous ) 3031 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 3032#endif 3033 3034 if (!UseMembar) { 3035 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_EXECUTE_READWRITE); 3036 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 3037 3038 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_EXECUTE_READWRITE); 3039 guarantee( return_page != NULL, "Commit Failed for memory serialize page"); 3040 3041 os::set_memory_serialize_page( mem_serialize_page ); 3042 3043#ifndef PRODUCT 3044 if(Verbose && PrintMiscellaneous) 3045 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3046#endif 3047} 3048 3049 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init()); 3050 3051 // Setup Windows Exceptions 3052 3053 // On Itanium systems, Structured Exception Handling does not 3054 // work since stack frames must be walkable by the OS. Since 3055 // much of our code is dynamically generated, and we do not have 3056 // proper unwind .xdata sections, the system simply exits 3057 // rather than delivering the exception. To work around 3058 // this we use VectorExceptions instead. 3059#ifdef _WIN64 3060 if (UseVectoredExceptions) { 3061 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter); 3062 } 3063#endif 3064 3065 // for debugging float code generation bugs 3066 if (ForceFloatExceptions) { 3067#ifndef _WIN64 3068 static long fp_control_word = 0; 3069 __asm { fstcw fp_control_word } 3070 // see Intel PPro Manual, Vol. 2, p 7-16 3071 const long precision = 0x20; 3072 const long underflow = 0x10; 3073 const long overflow = 0x08; 3074 const long zero_div = 0x04; 3075 const long denorm = 0x02; 3076 const long invalid = 0x01; 3077 fp_control_word |= invalid; 3078 __asm { fldcw fp_control_word } 3079#endif 3080 } 3081 3082 // Initialize HPI. 3083 jint hpi_result = hpi::initialize(); 3084 if (hpi_result != JNI_OK) { return hpi_result; } 3085 3086 // If stack_commit_size is 0, windows will reserve the default size, 3087 // but only commit a small portion of it. 3088 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 3089 size_t default_reserve_size = os::win32::default_stack_size(); 3090 size_t actual_reserve_size = stack_commit_size; 3091 if (stack_commit_size < default_reserve_size) { 3092 // If stack_commit_size == 0, we want this too 3093 actual_reserve_size = default_reserve_size; 3094 } 3095 3096 JavaThread::set_stack_size_at_create(stack_commit_size); 3097 3098 // Calculate theoretical max. size of Threads to guard gainst artifical 3099 // out-of-memory situations, where all available address-space has been 3100 // reserved by thread stacks. 3101 assert(actual_reserve_size != 0, "Must have a stack"); 3102 3103 // Calculate the thread limit when we should start doing Virtual Memory 3104 // banging. Currently when the threads will have used all but 200Mb of space. 3105 // 3106 // TODO: consider performing a similar calculation for commit size instead 3107 // as reserve size, since on a 64-bit platform we'll run into that more 3108 // often than running out of virtual memory space. We can use the 3109 // lower value of the two calculations as the os_thread_limit. 3110 size_t max_address_space = ((size_t)1 << (BitsPerOop - 1)) - (200 * K * K); 3111 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 3112 3113 // at exit methods are called in the reverse order of their registration. 3114 // there is no limit to the number of functions registered. atexit does 3115 // not set errno. 3116 3117 if (PerfAllowAtExitRegistration) { 3118 // only register atexit functions if PerfAllowAtExitRegistration is set. 3119 // atexit functions can be delayed until process exit time, which 3120 // can be problematic for embedded VM situations. Embedded VMs should 3121 // call DestroyJavaVM() to assure that VM resources are released. 3122 3123 // note: perfMemory_exit_helper atexit function may be removed in 3124 // the future if the appropriate cleanup code can be added to the 3125 // VM_Exit VMOperation's doit method. 3126 if (atexit(perfMemory_exit_helper) != 0) { 3127 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3128 } 3129 } 3130 3131 // initialize PSAPI or ToolHelp for fatal error handler 3132 if (win32::is_nt()) _init_psapi(); 3133 else _init_toolhelp(); 3134 3135#ifndef _WIN64 3136 // Print something if NX is enabled (win32 on AMD64) 3137 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 3138#endif 3139 3140 // initialize thread priority policy 3141 prio_init(); 3142 3143 return JNI_OK; 3144} 3145 3146 3147// Mark the polling page as unreadable 3148void os::make_polling_page_unreadable(void) { 3149 DWORD old_status; 3150 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) ) 3151 fatal("Could not disable polling page"); 3152}; 3153 3154// Mark the polling page as readable 3155void os::make_polling_page_readable(void) { 3156 DWORD old_status; 3157 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) ) 3158 fatal("Could not enable polling page"); 3159}; 3160 3161 3162int os::stat(const char *path, struct stat *sbuf) { 3163 char pathbuf[MAX_PATH]; 3164 if (strlen(path) > MAX_PATH - 1) { 3165 errno = ENAMETOOLONG; 3166 return -1; 3167 } 3168 hpi::native_path(strcpy(pathbuf, path)); 3169 int ret = ::stat(pathbuf, sbuf); 3170 if (sbuf != NULL && UseUTCFileTimestamp) { 3171 // Fix for 6539723. st_mtime returned from stat() is dependent on 3172 // the system timezone and so can return different values for the 3173 // same file if/when daylight savings time changes. This adjustment 3174 // makes sure the same timestamp is returned regardless of the TZ. 3175 // 3176 // See: 3177 // http://msdn.microsoft.com/library/ 3178 // default.asp?url=/library/en-us/sysinfo/base/ 3179 // time_zone_information_str.asp 3180 // and 3181 // http://msdn.microsoft.com/library/default.asp?url= 3182 // /library/en-us/sysinfo/base/settimezoneinformation.asp 3183 // 3184 // NOTE: there is a insidious bug here: If the timezone is changed 3185 // after the call to stat() but before 'GetTimeZoneInformation()', then 3186 // the adjustment we do here will be wrong and we'll return the wrong 3187 // value (which will likely end up creating an invalid class data 3188 // archive). Absent a better API for this, or some time zone locking 3189 // mechanism, we'll have to live with this risk. 3190 TIME_ZONE_INFORMATION tz; 3191 DWORD tzid = GetTimeZoneInformation(&tz); 3192 int daylightBias = 3193 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 3194 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 3195 } 3196 return ret; 3197} 3198 3199 3200#define FT2INT64(ft) \ 3201 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 3202 3203 3204// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3205// are used by JVM M&M and JVMTI to get user+sys or user CPU time 3206// of a thread. 3207// 3208// current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3209// the fast estimate available on the platform. 3210 3211// current_thread_cpu_time() is not optimized for Windows yet 3212jlong os::current_thread_cpu_time() { 3213 // return user + sys since the cost is the same 3214 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 3215} 3216 3217jlong os::thread_cpu_time(Thread* thread) { 3218 // consistent with what current_thread_cpu_time() returns. 3219 return os::thread_cpu_time(thread, true /* user+sys */); 3220} 3221 3222jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3223 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3224} 3225 3226jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 3227 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 3228 // If this function changes, os::is_thread_cpu_time_supported() should too 3229 if (os::win32::is_nt()) { 3230 FILETIME CreationTime; 3231 FILETIME ExitTime; 3232 FILETIME KernelTime; 3233 FILETIME UserTime; 3234 3235 if ( GetThreadTimes(thread->osthread()->thread_handle(), 3236 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 3237 return -1; 3238 else 3239 if (user_sys_cpu_time) { 3240 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 3241 } else { 3242 return FT2INT64(UserTime) * 100; 3243 } 3244 } else { 3245 return (jlong) timeGetTime() * 1000000; 3246 } 3247} 3248 3249void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3250 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 3251 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 3252 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 3253 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3254} 3255 3256void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3257 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 3258 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 3259 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 3260 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3261} 3262 3263bool os::is_thread_cpu_time_supported() { 3264 // see os::thread_cpu_time 3265 if (os::win32::is_nt()) { 3266 FILETIME CreationTime; 3267 FILETIME ExitTime; 3268 FILETIME KernelTime; 3269 FILETIME UserTime; 3270 3271 if ( GetThreadTimes(GetCurrentThread(), 3272 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 3273 return false; 3274 else 3275 return true; 3276 } else { 3277 return false; 3278 } 3279} 3280 3281// Windows does't provide a loadavg primitive so this is stubbed out for now. 3282// It does have primitives (PDH API) to get CPU usage and run queue length. 3283// "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 3284// If we wanted to implement loadavg on Windows, we have a few options: 3285// 3286// a) Query CPU usage and run queue length and "fake" an answer by 3287// returning the CPU usage if it's under 100%, and the run queue 3288// length otherwise. It turns out that querying is pretty slow 3289// on Windows, on the order of 200 microseconds on a fast machine. 3290// Note that on the Windows the CPU usage value is the % usage 3291// since the last time the API was called (and the first call 3292// returns 100%), so we'd have to deal with that as well. 3293// 3294// b) Sample the "fake" answer using a sampling thread and store 3295// the answer in a global variable. The call to loadavg would 3296// just return the value of the global, avoiding the slow query. 3297// 3298// c) Sample a better answer using exponential decay to smooth the 3299// value. This is basically the algorithm used by UNIX kernels. 3300// 3301// Note that sampling thread starvation could affect both (b) and (c). 3302int os::loadavg(double loadavg[], int nelem) { 3303 return -1; 3304} 3305 3306 3307// DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 3308bool os::dont_yield() { 3309 return DontYieldALot; 3310} 3311 3312// Is a (classpath) directory empty? 3313bool os::dir_is_empty(const char* path) { 3314 WIN32_FIND_DATA fd; 3315 HANDLE f = FindFirstFile(path, &fd); 3316 if (f == INVALID_HANDLE_VALUE) { 3317 return true; 3318 } 3319 FindClose(f); 3320 return false; 3321} 3322 3323// create binary file, rewriting existing file if required 3324int os::create_binary_file(const char* path, bool rewrite_existing) { 3325 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 3326 if (!rewrite_existing) { 3327 oflags |= _O_EXCL; 3328 } 3329 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 3330} 3331 3332// return current position of file pointer 3333jlong os::current_file_offset(int fd) { 3334 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 3335} 3336 3337// move file pointer to the specified offset 3338jlong os::seek_to_file_offset(int fd, jlong offset) { 3339 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 3340} 3341 3342 3343// Map a block of memory. 3344char* os::map_memory(int fd, const char* file_name, size_t file_offset, 3345 char *addr, size_t bytes, bool read_only, 3346 bool allow_exec) { 3347 HANDLE hFile; 3348 char* base; 3349 3350 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 3351 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 3352 if (hFile == NULL) { 3353 if (PrintMiscellaneous && Verbose) { 3354 DWORD err = GetLastError(); 3355 tty->print_cr("CreateFile() failed: GetLastError->%ld."); 3356 } 3357 return NULL; 3358 } 3359 3360 if (allow_exec) { 3361 // CreateFileMapping/MapViewOfFileEx can't map executable memory 3362 // unless it comes from a PE image (which the shared archive is not.) 3363 // Even VirtualProtect refuses to give execute access to mapped memory 3364 // that was not previously executable. 3365 // 3366 // Instead, stick the executable region in anonymous memory. Yuck. 3367 // Penalty is that ~4 pages will not be shareable - in the future 3368 // we might consider DLLizing the shared archive with a proper PE 3369 // header so that mapping executable + sharing is possible. 3370 3371 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 3372 PAGE_READWRITE); 3373 if (base == NULL) { 3374 if (PrintMiscellaneous && Verbose) { 3375 DWORD err = GetLastError(); 3376 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 3377 } 3378 CloseHandle(hFile); 3379 return NULL; 3380 } 3381 3382 DWORD bytes_read; 3383 OVERLAPPED overlapped; 3384 overlapped.Offset = (DWORD)file_offset; 3385 overlapped.OffsetHigh = 0; 3386 overlapped.hEvent = NULL; 3387 // ReadFile guarantees that if the return value is true, the requested 3388 // number of bytes were read before returning. 3389 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 3390 if (!res) { 3391 if (PrintMiscellaneous && Verbose) { 3392 DWORD err = GetLastError(); 3393 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 3394 } 3395 release_memory(base, bytes); 3396 CloseHandle(hFile); 3397 return NULL; 3398 } 3399 } else { 3400 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 3401 NULL /*file_name*/); 3402 if (hMap == NULL) { 3403 if (PrintMiscellaneous && Verbose) { 3404 DWORD err = GetLastError(); 3405 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld."); 3406 } 3407 CloseHandle(hFile); 3408 return NULL; 3409 } 3410 3411 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 3412 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 3413 (DWORD)bytes, addr); 3414 if (base == NULL) { 3415 if (PrintMiscellaneous && Verbose) { 3416 DWORD err = GetLastError(); 3417 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 3418 } 3419 CloseHandle(hMap); 3420 CloseHandle(hFile); 3421 return NULL; 3422 } 3423 3424 if (CloseHandle(hMap) == 0) { 3425 if (PrintMiscellaneous && Verbose) { 3426 DWORD err = GetLastError(); 3427 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 3428 } 3429 CloseHandle(hFile); 3430 return base; 3431 } 3432 } 3433 3434 if (allow_exec) { 3435 DWORD old_protect; 3436 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 3437 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 3438 3439 if (!res) { 3440 if (PrintMiscellaneous && Verbose) { 3441 DWORD err = GetLastError(); 3442 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 3443 } 3444 // Don't consider this a hard error, on IA32 even if the 3445 // VirtualProtect fails, we should still be able to execute 3446 CloseHandle(hFile); 3447 return base; 3448 } 3449 } 3450 3451 if (CloseHandle(hFile) == 0) { 3452 if (PrintMiscellaneous && Verbose) { 3453 DWORD err = GetLastError(); 3454 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 3455 } 3456 return base; 3457 } 3458 3459 return base; 3460} 3461 3462 3463// Remap a block of memory. 3464char* os::remap_memory(int fd, const char* file_name, size_t file_offset, 3465 char *addr, size_t bytes, bool read_only, 3466 bool allow_exec) { 3467 // This OS does not allow existing memory maps to be remapped so we 3468 // have to unmap the memory before we remap it. 3469 if (!os::unmap_memory(addr, bytes)) { 3470 return NULL; 3471 } 3472 3473 // There is a very small theoretical window between the unmap_memory() 3474 // call above and the map_memory() call below where a thread in native 3475 // code may be able to access an address that is no longer mapped. 3476 3477 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3478 allow_exec); 3479} 3480 3481 3482// Unmap a block of memory. 3483// Returns true=success, otherwise false. 3484 3485bool os::unmap_memory(char* addr, size_t bytes) { 3486 BOOL result = UnmapViewOfFile(addr); 3487 if (result == 0) { 3488 if (PrintMiscellaneous && Verbose) { 3489 DWORD err = GetLastError(); 3490 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 3491 } 3492 return false; 3493 } 3494 return true; 3495} 3496 3497void os::pause() { 3498 char filename[MAX_PATH]; 3499 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 3500 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 3501 } else { 3502 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 3503 } 3504 3505 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 3506 if (fd != -1) { 3507 struct stat buf; 3508 close(fd); 3509 while (::stat(filename, &buf) == 0) { 3510 Sleep(100); 3511 } 3512 } else { 3513 jio_fprintf(stderr, 3514 "Could not open pause file '%s', continuing immediately.\n", filename); 3515 } 3516} 3517 3518// An Event wraps a win32 "CreateEvent" kernel handle. 3519// 3520// We have a number of choices regarding "CreateEvent" win32 handle leakage: 3521// 3522// 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 3523// field, and call CloseHandle() on the win32 event handle. Unpark() would 3524// need to be modified to tolerate finding a NULL (invalid) win32 event handle. 3525// In addition, an unpark() operation might fetch the handle field, but the 3526// event could recycle between the fetch and the SetEvent() operation. 3527// SetEvent() would either fail because the handle was invalid, or inadvertently work, 3528// as the win32 handle value had been recycled. In an ideal world calling SetEvent() 3529// on an stale but recycled handle would be harmless, but in practice this might 3530// confuse other non-Sun code, so it's not a viable approach. 3531// 3532// 2: Once a win32 event handle is associated with an Event, it remains associated 3533// with the Event. The event handle is never closed. This could be construed 3534// as handle leakage, but only up to the maximum # of threads that have been extant 3535// at any one time. This shouldn't be an issue, as windows platforms typically 3536// permit a process to have hundreds of thousands of open handles. 3537// 3538// 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 3539// and release unused handles. 3540// 3541// 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 3542// It's not clear, however, that we wouldn't be trading one type of leak for another. 3543// 3544// 5. Use an RCU-like mechanism (Read-Copy Update). 3545// Or perhaps something similar to Maged Michael's "Hazard pointers". 3546// 3547// We use (2). 3548// 3549// TODO-FIXME: 3550// 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 3551// 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 3552// to recover from (or at least detect) the dreaded Windows 841176 bug. 3553// 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 3554// into a single win32 CreateEvent() handle. 3555// 3556// _Event transitions in park() 3557// -1 => -1 : illegal 3558// 1 => 0 : pass - return immediately 3559// 0 => -1 : block 3560// 3561// _Event serves as a restricted-range semaphore : 3562// -1 : thread is blocked 3563// 0 : neutral - thread is running or ready 3564// 1 : signaled - thread is running or ready 3565// 3566// Another possible encoding of _Event would be 3567// with explicit "PARKED" and "SIGNALED" bits. 3568 3569int os::PlatformEvent::park (jlong Millis) { 3570 guarantee (_ParkHandle != NULL , "Invariant") ; 3571 guarantee (Millis > 0 , "Invariant") ; 3572 int v ; 3573 3574 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 3575 // the initial park() operation. 3576 3577 for (;;) { 3578 v = _Event ; 3579 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 3580 } 3581 guarantee ((v == 0) || (v == 1), "invariant") ; 3582 if (v != 0) return OS_OK ; 3583 3584 // Do this the hard way by blocking ... 3585 // TODO: consider a brief spin here, gated on the success of recent 3586 // spin attempts by this thread. 3587 // 3588 // We decompose long timeouts into series of shorter timed waits. 3589 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 3590 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 3591 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 3592 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 3593 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 3594 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 3595 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 3596 // for the already waited time. This policy does not admit any new outcomes. 3597 // In the future, however, we might want to track the accumulated wait time and 3598 // adjust Millis accordingly if we encounter a spurious wakeup. 3599 3600 const int MAXTIMEOUT = 0x10000000 ; 3601 DWORD rv = WAIT_TIMEOUT ; 3602 while (_Event < 0 && Millis > 0) { 3603 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT) 3604 if (Millis > MAXTIMEOUT) { 3605 prd = MAXTIMEOUT ; 3606 } 3607 rv = ::WaitForSingleObject (_ParkHandle, prd) ; 3608 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ; 3609 if (rv == WAIT_TIMEOUT) { 3610 Millis -= prd ; 3611 } 3612 } 3613 v = _Event ; 3614 _Event = 0 ; 3615 OrderAccess::fence() ; 3616 // If we encounter a nearly simultanous timeout expiry and unpark() 3617 // we return OS_OK indicating we awoke via unpark(). 3618 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 3619 return (v >= 0) ? OS_OK : OS_TIMEOUT ; 3620} 3621 3622void os::PlatformEvent::park () { 3623 guarantee (_ParkHandle != NULL, "Invariant") ; 3624 // Invariant: Only the thread associated with the Event/PlatformEvent 3625 // may call park(). 3626 int v ; 3627 for (;;) { 3628 v = _Event ; 3629 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 3630 } 3631 guarantee ((v == 0) || (v == 1), "invariant") ; 3632 if (v != 0) return ; 3633 3634 // Do this the hard way by blocking ... 3635 // TODO: consider a brief spin here, gated on the success of recent 3636 // spin attempts by this thread. 3637 while (_Event < 0) { 3638 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ; 3639 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ; 3640 } 3641 3642 // Usually we'll find _Event == 0 at this point, but as 3643 // an optional optimization we clear it, just in case can 3644 // multiple unpark() operations drove _Event up to 1. 3645 _Event = 0 ; 3646 OrderAccess::fence() ; 3647 guarantee (_Event >= 0, "invariant") ; 3648} 3649 3650void os::PlatformEvent::unpark() { 3651 guarantee (_ParkHandle != NULL, "Invariant") ; 3652 int v ; 3653 for (;;) { 3654 v = _Event ; // Increment _Event if it's < 1. 3655 if (v > 0) { 3656 // If it's already signaled just return. 3657 // The LD of _Event could have reordered or be satisfied 3658 // by a read-aside from this processor's write buffer. 3659 // To avoid problems execute a barrier and then 3660 // ratify the value. A degenerate CAS() would also work. 3661 // Viz., CAS (v+0, &_Event, v) == v). 3662 OrderAccess::fence() ; 3663 if (_Event == v) return ; 3664 continue ; 3665 } 3666 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; 3667 } 3668 if (v < 0) { 3669 ::SetEvent (_ParkHandle) ; 3670 } 3671} 3672 3673 3674// JSR166 3675// ------------------------------------------------------- 3676 3677/* 3678 * The Windows implementation of Park is very straightforward: Basic 3679 * operations on Win32 Events turn out to have the right semantics to 3680 * use them directly. We opportunistically resuse the event inherited 3681 * from Monitor. 3682 */ 3683 3684 3685void Parker::park(bool isAbsolute, jlong time) { 3686 guarantee (_ParkEvent != NULL, "invariant") ; 3687 // First, demultiplex/decode time arguments 3688 if (time < 0) { // don't wait 3689 return; 3690 } 3691 else if (time == 0) { 3692 time = INFINITE; 3693 } 3694 else if (isAbsolute) { 3695 time -= os::javaTimeMillis(); // convert to relative time 3696 if (time <= 0) // already elapsed 3697 return; 3698 } 3699 else { // relative 3700 time /= 1000000; // Must coarsen from nanos to millis 3701 if (time == 0) // Wait for the minimal time unit if zero 3702 time = 1; 3703 } 3704 3705 JavaThread* thread = (JavaThread*)(Thread::current()); 3706 assert(thread->is_Java_thread(), "Must be JavaThread"); 3707 JavaThread *jt = (JavaThread *)thread; 3708 3709 // Don't wait if interrupted or already triggered 3710 if (Thread::is_interrupted(thread, false) || 3711 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 3712 ResetEvent(_ParkEvent); 3713 return; 3714 } 3715 else { 3716 ThreadBlockInVM tbivm(jt); 3717 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 3718 jt->set_suspend_equivalent(); 3719 3720 WaitForSingleObject(_ParkEvent, time); 3721 ResetEvent(_ParkEvent); 3722 3723 // If externally suspended while waiting, re-suspend 3724 if (jt->handle_special_suspend_equivalent_condition()) { 3725 jt->java_suspend_self(); 3726 } 3727 } 3728} 3729 3730void Parker::unpark() { 3731 guarantee (_ParkEvent != NULL, "invariant") ; 3732 SetEvent(_ParkEvent); 3733} 3734 3735// Run the specified command in a separate process. Return its exit value, 3736// or -1 on failure (e.g. can't create a new process). 3737int os::fork_and_exec(char* cmd) { 3738 STARTUPINFO si; 3739 PROCESS_INFORMATION pi; 3740 3741 memset(&si, 0, sizeof(si)); 3742 si.cb = sizeof(si); 3743 memset(&pi, 0, sizeof(pi)); 3744 BOOL rslt = CreateProcess(NULL, // executable name - use command line 3745 cmd, // command line 3746 NULL, // process security attribute 3747 NULL, // thread security attribute 3748 TRUE, // inherits system handles 3749 0, // no creation flags 3750 NULL, // use parent's environment block 3751 NULL, // use parent's starting directory 3752 &si, // (in) startup information 3753 &pi); // (out) process information 3754 3755 if (rslt) { 3756 // Wait until child process exits. 3757 WaitForSingleObject(pi.hProcess, INFINITE); 3758 3759 DWORD exit_code; 3760 GetExitCodeProcess(pi.hProcess, &exit_code); 3761 3762 // Close process and thread handles. 3763 CloseHandle(pi.hProcess); 3764 CloseHandle(pi.hThread); 3765 3766 return (int)exit_code; 3767 } else { 3768 return -1; 3769 } 3770} 3771 3772//-------------------------------------------------------------------------------------------------- 3773// Non-product code 3774 3775static int mallocDebugIntervalCounter = 0; 3776static int mallocDebugCounter = 0; 3777bool os::check_heap(bool force) { 3778 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 3779 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 3780 // Note: HeapValidate executes two hardware breakpoints when it finds something 3781 // wrong; at these points, eax contains the address of the offending block (I think). 3782 // To get to the exlicit error message(s) below, just continue twice. 3783 HANDLE heap = GetProcessHeap(); 3784 { HeapLock(heap); 3785 PROCESS_HEAP_ENTRY phe; 3786 phe.lpData = NULL; 3787 while (HeapWalk(heap, &phe) != 0) { 3788 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 3789 !HeapValidate(heap, 0, phe.lpData)) { 3790 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 3791 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 3792 fatal("corrupted C heap"); 3793 } 3794 } 3795 int err = GetLastError(); 3796 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 3797 fatal1("heap walk aborted with error %d", err); 3798 } 3799 HeapUnlock(heap); 3800 } 3801 mallocDebugIntervalCounter = 0; 3802 } 3803 return true; 3804} 3805 3806 3807#ifndef PRODUCT 3808bool os::find(address addr) { 3809 // Nothing yet 3810 return false; 3811} 3812#endif 3813 3814LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 3815 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 3816 3817 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { 3818 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow(); 3819 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 3820 address addr = (address) exceptionRecord->ExceptionInformation[1]; 3821 3822 if (os::is_memory_serialize_page(thread, addr)) 3823 return EXCEPTION_CONTINUE_EXECUTION; 3824 } 3825 3826 return EXCEPTION_CONTINUE_SEARCH; 3827} 3828 3829static int getLastErrorString(char *buf, size_t len) 3830{ 3831 long errval; 3832 3833 if ((errval = GetLastError()) != 0) 3834 { 3835 /* DOS error */ 3836 size_t n = (size_t)FormatMessage( 3837 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 3838 NULL, 3839 errval, 3840 0, 3841 buf, 3842 (DWORD)len, 3843 NULL); 3844 if (n > 3) { 3845 /* Drop final '.', CR, LF */ 3846 if (buf[n - 1] == '\n') n--; 3847 if (buf[n - 1] == '\r') n--; 3848 if (buf[n - 1] == '.') n--; 3849 buf[n] = '\0'; 3850 } 3851 return (int)n; 3852 } 3853 3854 if (errno != 0) 3855 { 3856 /* C runtime error that has no corresponding DOS error code */ 3857 const char *s = strerror(errno); 3858 size_t n = strlen(s); 3859 if (n >= len) n = len - 1; 3860 strncpy(buf, s, n); 3861 buf[n] = '\0'; 3862 return (int)n; 3863 } 3864 return 0; 3865} 3866