os_windows.cpp revision 20:e195fe4c40c7
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#ifdef _LP64 625 return size; 626#else 627 // Limit to 1400m because of the 2gb address space wall 628 return MIN2(size, (julong)1400*M); 629#endif 630} 631 632// VC6 lacks DWORD_PTR 633#if _MSC_VER < 1300 634typedef UINT_PTR DWORD_PTR; 635#endif 636 637int os::active_processor_count() { 638 DWORD_PTR lpProcessAffinityMask = 0; 639 DWORD_PTR lpSystemAffinityMask = 0; 640 int proc_count = processor_count(); 641 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 642 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 643 // Nof active processors is number of bits in process affinity mask 644 int bitcount = 0; 645 while (lpProcessAffinityMask != 0) { 646 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 647 bitcount++; 648 } 649 return bitcount; 650 } else { 651 return proc_count; 652 } 653} 654 655bool os::distribute_processes(uint length, uint* distribution) { 656 // Not yet implemented. 657 return false; 658} 659 660bool os::bind_to_processor(uint processor_id) { 661 // Not yet implemented. 662 return false; 663} 664 665static void initialize_performance_counter() { 666 LARGE_INTEGER count; 667 if (QueryPerformanceFrequency(&count)) { 668 has_performance_count = 1; 669 performance_frequency = as_long(count); 670 QueryPerformanceCounter(&count); 671 initial_performance_count = as_long(count); 672 } else { 673 has_performance_count = 0; 674 FILETIME wt; 675 GetSystemTimeAsFileTime(&wt); 676 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 677 } 678} 679 680 681double os::elapsedTime() { 682 return (double) elapsed_counter() / (double) elapsed_frequency(); 683} 684 685 686// Windows format: 687// The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 688// Java format: 689// Java standards require the number of milliseconds since 1/1/1970 690 691// Constant offset - calculated using offset() 692static jlong _offset = 116444736000000000; 693// Fake time counter for reproducible results when debugging 694static jlong fake_time = 0; 695 696#ifdef ASSERT 697// Just to be safe, recalculate the offset in debug mode 698static jlong _calculated_offset = 0; 699static int _has_calculated_offset = 0; 700 701jlong offset() { 702 if (_has_calculated_offset) return _calculated_offset; 703 SYSTEMTIME java_origin; 704 java_origin.wYear = 1970; 705 java_origin.wMonth = 1; 706 java_origin.wDayOfWeek = 0; // ignored 707 java_origin.wDay = 1; 708 java_origin.wHour = 0; 709 java_origin.wMinute = 0; 710 java_origin.wSecond = 0; 711 java_origin.wMilliseconds = 0; 712 FILETIME jot; 713 if (!SystemTimeToFileTime(&java_origin, &jot)) { 714 fatal1("Error = %d\nWindows error", GetLastError()); 715 } 716 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 717 _has_calculated_offset = 1; 718 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 719 return _calculated_offset; 720} 721#else 722jlong offset() { 723 return _offset; 724} 725#endif 726 727jlong windows_to_java_time(FILETIME wt) { 728 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 729 return (a - offset()) / 10000; 730} 731 732FILETIME java_to_windows_time(jlong l) { 733 jlong a = (l * 10000) + offset(); 734 FILETIME result; 735 result.dwHighDateTime = high(a); 736 result.dwLowDateTime = low(a); 737 return result; 738} 739 740jlong os::timeofday() { 741 FILETIME wt; 742 GetSystemTimeAsFileTime(&wt); 743 return windows_to_java_time(wt); 744} 745 746 747// Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 748// _use_global_time is only set if CacheTimeMillis is true 749jlong os::javaTimeMillis() { 750 if (UseFakeTimers) { 751 return fake_time++; 752 } else { 753 return (_use_global_time ? read_global_time() : timeofday()); 754 } 755} 756 757#define NANOS_PER_SEC CONST64(1000000000) 758#define NANOS_PER_MILLISEC 1000000 759jlong os::javaTimeNanos() { 760 if (!has_performance_count) { 761 return javaTimeMillis() * NANOS_PER_MILLISEC; // the best we can do. 762 } else { 763 LARGE_INTEGER current_count; 764 QueryPerformanceCounter(¤t_count); 765 double current = as_long(current_count); 766 double freq = performance_frequency; 767 jlong time = (jlong)((current/freq) * NANOS_PER_SEC); 768 return time; 769 } 770} 771 772void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 773 if (!has_performance_count) { 774 // javaTimeMillis() doesn't have much percision, 775 // but it is not going to wrap -- so all 64 bits 776 info_ptr->max_value = ALL_64_BITS; 777 778 // this is a wall clock timer, so may skip 779 info_ptr->may_skip_backward = true; 780 info_ptr->may_skip_forward = true; 781 } else { 782 jlong freq = performance_frequency; 783 if (freq < NANOS_PER_SEC) { 784 // the performance counter is 64 bits and we will 785 // be multiplying it -- so no wrap in 64 bits 786 info_ptr->max_value = ALL_64_BITS; 787 } else if (freq > NANOS_PER_SEC) { 788 // use the max value the counter can reach to 789 // determine the max value which could be returned 790 julong max_counter = (julong)ALL_64_BITS; 791 info_ptr->max_value = (jlong)(max_counter / (freq / NANOS_PER_SEC)); 792 } else { 793 // the performance counter is 64 bits and we will 794 // be using it directly -- so no wrap in 64 bits 795 info_ptr->max_value = ALL_64_BITS; 796 } 797 798 // using a counter, so no skipping 799 info_ptr->may_skip_backward = false; 800 info_ptr->may_skip_forward = false; 801 } 802 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 803} 804 805char* os::local_time_string(char *buf, size_t buflen) { 806 SYSTEMTIME st; 807 GetLocalTime(&st); 808 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 809 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 810 return buf; 811} 812 813bool os::getTimesSecs(double* process_real_time, 814 double* process_user_time, 815 double* process_system_time) { 816 HANDLE h_process = GetCurrentProcess(); 817 FILETIME create_time, exit_time, kernel_time, user_time; 818 BOOL result = GetProcessTimes(h_process, 819 &create_time, 820 &exit_time, 821 &kernel_time, 822 &user_time); 823 if (result != 0) { 824 FILETIME wt; 825 GetSystemTimeAsFileTime(&wt); 826 jlong rtc_millis = windows_to_java_time(wt); 827 jlong user_millis = windows_to_java_time(user_time); 828 jlong system_millis = windows_to_java_time(kernel_time); 829 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 830 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); 831 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); 832 return true; 833 } else { 834 return false; 835 } 836} 837 838void os::shutdown() { 839 840 // allow PerfMemory to attempt cleanup of any persistent resources 841 perfMemory_exit(); 842 843 // flush buffered output, finish log files 844 ostream_abort(); 845 846 // Check for abort hook 847 abort_hook_t abort_hook = Arguments::abort_hook(); 848 if (abort_hook != NULL) { 849 abort_hook(); 850 } 851} 852 853void os::abort(bool dump_core) 854{ 855 os::shutdown(); 856 // no core dump on Windows 857 ::exit(1); 858} 859 860// Die immediately, no exit hook, no abort hook, no cleanup. 861void os::die() { 862 _exit(-1); 863} 864 865// Directory routines copied from src/win32/native/java/io/dirent_md.c 866// * dirent_md.c 1.15 00/02/02 867// 868// The declarations for DIR and struct dirent are in jvm_win32.h. 869 870/* Caller must have already run dirname through JVM_NativePath, which removes 871 duplicate slashes and converts all instances of '/' into '\\'. */ 872 873DIR * 874os::opendir(const char *dirname) 875{ 876 assert(dirname != NULL, "just checking"); // hotspot change 877 DIR *dirp = (DIR *)malloc(sizeof(DIR)); 878 DWORD fattr; // hotspot change 879 char alt_dirname[4] = { 0, 0, 0, 0 }; 880 881 if (dirp == 0) { 882 errno = ENOMEM; 883 return 0; 884 } 885 886 /* 887 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it 888 * as a directory in FindFirstFile(). We detect this case here and 889 * prepend the current drive name. 890 */ 891 if (dirname[1] == '\0' && dirname[0] == '\\') { 892 alt_dirname[0] = _getdrive() + 'A' - 1; 893 alt_dirname[1] = ':'; 894 alt_dirname[2] = '\\'; 895 alt_dirname[3] = '\0'; 896 dirname = alt_dirname; 897 } 898 899 dirp->path = (char *)malloc(strlen(dirname) + 5); 900 if (dirp->path == 0) { 901 free(dirp); 902 errno = ENOMEM; 903 return 0; 904 } 905 strcpy(dirp->path, dirname); 906 907 fattr = GetFileAttributes(dirp->path); 908 if (fattr == 0xffffffff) { 909 free(dirp->path); 910 free(dirp); 911 errno = ENOENT; 912 return 0; 913 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 914 free(dirp->path); 915 free(dirp); 916 errno = ENOTDIR; 917 return 0; 918 } 919 920 /* Append "*.*", or possibly "\\*.*", to path */ 921 if (dirp->path[1] == ':' 922 && (dirp->path[2] == '\0' 923 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 924 /* No '\\' needed for cases like "Z:" or "Z:\" */ 925 strcat(dirp->path, "*.*"); 926 } else { 927 strcat(dirp->path, "\\*.*"); 928 } 929 930 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 931 if (dirp->handle == INVALID_HANDLE_VALUE) { 932 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 933 free(dirp->path); 934 free(dirp); 935 errno = EACCES; 936 return 0; 937 } 938 } 939 return dirp; 940} 941 942/* parameter dbuf unused on Windows */ 943 944struct dirent * 945os::readdir(DIR *dirp, dirent *dbuf) 946{ 947 assert(dirp != NULL, "just checking"); // hotspot change 948 if (dirp->handle == INVALID_HANDLE_VALUE) { 949 return 0; 950 } 951 952 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 953 954 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 955 if (GetLastError() == ERROR_INVALID_HANDLE) { 956 errno = EBADF; 957 return 0; 958 } 959 FindClose(dirp->handle); 960 dirp->handle = INVALID_HANDLE_VALUE; 961 } 962 963 return &dirp->dirent; 964} 965 966int 967os::closedir(DIR *dirp) 968{ 969 assert(dirp != NULL, "just checking"); // hotspot change 970 if (dirp->handle != INVALID_HANDLE_VALUE) { 971 if (!FindClose(dirp->handle)) { 972 errno = EBADF; 973 return -1; 974 } 975 dirp->handle = INVALID_HANDLE_VALUE; 976 } 977 free(dirp->path); 978 free(dirp); 979 return 0; 980} 981 982const char* os::dll_file_extension() { return ".dll"; } 983 984const char * os::get_temp_directory() 985{ 986 static char path_buf[MAX_PATH]; 987 if (GetTempPath(MAX_PATH, path_buf)>0) 988 return path_buf; 989 else{ 990 path_buf[0]='\0'; 991 return path_buf; 992 } 993} 994 995// Needs to be in os specific directory because windows requires another 996// header file <direct.h> 997const char* os::get_current_directory(char *buf, int buflen) { 998 return _getcwd(buf, buflen); 999} 1000 1001//----------------------------------------------------------- 1002// Helper functions for fatal error handler 1003 1004// The following library functions are resolved dynamically at runtime: 1005 1006// PSAPI functions, for Windows NT, 2000, XP 1007 1008// psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform 1009// SDK from Microsoft. Here are the definitions copied from psapi.h 1010typedef struct _MODULEINFO { 1011 LPVOID lpBaseOfDll; 1012 DWORD SizeOfImage; 1013 LPVOID EntryPoint; 1014} MODULEINFO, *LPMODULEINFO; 1015 1016static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD ); 1017static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD ); 1018static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD ); 1019 1020// ToolHelp Functions, for Windows 95, 98 and ME 1021 1022static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ; 1023static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ; 1024static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ; 1025 1026bool _has_psapi; 1027bool _psapi_init = false; 1028bool _has_toolhelp; 1029 1030static bool _init_psapi() { 1031 HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ; 1032 if( psapi == NULL ) return false ; 1033 1034 _EnumProcessModules = CAST_TO_FN_PTR( 1035 BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD), 1036 GetProcAddress(psapi, "EnumProcessModules")) ; 1037 _GetModuleFileNameEx = CAST_TO_FN_PTR( 1038 DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD), 1039 GetProcAddress(psapi, "GetModuleFileNameExA")); 1040 _GetModuleInformation = CAST_TO_FN_PTR( 1041 BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD), 1042 GetProcAddress(psapi, "GetModuleInformation")); 1043 1044 _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation); 1045 _psapi_init = true; 1046 return _has_psapi; 1047} 1048 1049static bool _init_toolhelp() { 1050 HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ; 1051 if (kernel32 == NULL) return false ; 1052 1053 _CreateToolhelp32Snapshot = CAST_TO_FN_PTR( 1054 HANDLE(WINAPI *)(DWORD,DWORD), 1055 GetProcAddress(kernel32, "CreateToolhelp32Snapshot")); 1056 _Module32First = CAST_TO_FN_PTR( 1057 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32), 1058 GetProcAddress(kernel32, "Module32First" )); 1059 _Module32Next = CAST_TO_FN_PTR( 1060 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32), 1061 GetProcAddress(kernel32, "Module32Next" )); 1062 1063 _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next); 1064 return _has_toolhelp; 1065} 1066 1067#ifdef _WIN64 1068// Helper routine which returns true if address in 1069// within the NTDLL address space. 1070// 1071static bool _addr_in_ntdll( address addr ) 1072{ 1073 HMODULE hmod; 1074 MODULEINFO minfo; 1075 1076 hmod = GetModuleHandle("NTDLL.DLL"); 1077 if ( hmod == NULL ) return false; 1078 if ( !_GetModuleInformation( GetCurrentProcess(), hmod, 1079 &minfo, sizeof(MODULEINFO)) ) 1080 return false; 1081 1082 if ( (addr >= minfo.lpBaseOfDll) && 1083 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) 1084 return true; 1085 else 1086 return false; 1087} 1088#endif 1089 1090 1091// Enumerate all modules for a given process ID 1092// 1093// Notice that Windows 95/98/Me and Windows NT/2000/XP have 1094// different API for doing this. We use PSAPI.DLL on NT based 1095// Windows and ToolHelp on 95/98/Me. 1096 1097// Callback function that is called by enumerate_modules() on 1098// every DLL module. 1099// Input parameters: 1100// int pid, 1101// char* module_file_name, 1102// address module_base_addr, 1103// unsigned module_size, 1104// void* param 1105typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *); 1106 1107// enumerate_modules for Windows NT, using PSAPI 1108static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param) 1109{ 1110 HANDLE hProcess ; 1111 1112# define MAX_NUM_MODULES 128 1113 HMODULE modules[MAX_NUM_MODULES]; 1114 static char filename[ MAX_PATH ]; 1115 int result = 0; 1116 1117 if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0; 1118 1119 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1120 FALSE, pid ) ; 1121 if (hProcess == NULL) return 0; 1122 1123 DWORD size_needed; 1124 if (!_EnumProcessModules(hProcess, modules, 1125 sizeof(modules), &size_needed)) { 1126 CloseHandle( hProcess ); 1127 return 0; 1128 } 1129 1130 // number of modules that are currently loaded 1131 int num_modules = size_needed / sizeof(HMODULE); 1132 1133 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1134 // Get Full pathname: 1135 if(!_GetModuleFileNameEx(hProcess, modules[i], 1136 filename, sizeof(filename))) { 1137 filename[0] = '\0'; 1138 } 1139 1140 MODULEINFO modinfo; 1141 if (!_GetModuleInformation(hProcess, modules[i], 1142 &modinfo, sizeof(modinfo))) { 1143 modinfo.lpBaseOfDll = NULL; 1144 modinfo.SizeOfImage = 0; 1145 } 1146 1147 // Invoke callback function 1148 result = func(pid, filename, (address)modinfo.lpBaseOfDll, 1149 modinfo.SizeOfImage, param); 1150 if (result) break; 1151 } 1152 1153 CloseHandle( hProcess ) ; 1154 return result; 1155} 1156 1157 1158// enumerate_modules for Windows 95/98/ME, using TOOLHELP 1159static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param) 1160{ 1161 HANDLE hSnapShot ; 1162 static MODULEENTRY32 modentry ; 1163 int result = 0; 1164 1165 if (!_has_toolhelp) return 0; 1166 1167 // Get a handle to a Toolhelp snapshot of the system 1168 hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ; 1169 if( hSnapShot == INVALID_HANDLE_VALUE ) { 1170 return FALSE ; 1171 } 1172 1173 // iterate through all modules 1174 modentry.dwSize = sizeof(MODULEENTRY32) ; 1175 bool not_done = _Module32First( hSnapShot, &modentry ) != 0; 1176 1177 while( not_done ) { 1178 // invoke the callback 1179 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr, 1180 modentry.modBaseSize, param); 1181 if (result) break; 1182 1183 modentry.dwSize = sizeof(MODULEENTRY32) ; 1184 not_done = _Module32Next( hSnapShot, &modentry ) != 0; 1185 } 1186 1187 CloseHandle(hSnapShot); 1188 return result; 1189} 1190 1191int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param ) 1192{ 1193 // Get current process ID if caller doesn't provide it. 1194 if (!pid) pid = os::current_process_id(); 1195 1196 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param); 1197 else return _enumerate_modules_windows(pid, func, param); 1198} 1199 1200struct _modinfo { 1201 address addr; 1202 char* full_path; // point to a char buffer 1203 int buflen; // size of the buffer 1204 address base_addr; 1205}; 1206 1207static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr, 1208 unsigned size, void * param) { 1209 struct _modinfo *pmod = (struct _modinfo *)param; 1210 if (!pmod) return -1; 1211 1212 if (base_addr <= pmod->addr && 1213 base_addr+size > pmod->addr) { 1214 // if a buffer is provided, copy path name to the buffer 1215 if (pmod->full_path) { 1216 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1217 } 1218 pmod->base_addr = base_addr; 1219 return 1; 1220 } 1221 return 0; 1222} 1223 1224bool os::dll_address_to_library_name(address addr, char* buf, 1225 int buflen, int* offset) { 1226// NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1227// return the full path to the DLL file, sometimes it returns path 1228// to the corresponding PDB file (debug info); sometimes it only 1229// returns partial path, which makes life painful. 1230 1231 struct _modinfo mi; 1232 mi.addr = addr; 1233 mi.full_path = buf; 1234 mi.buflen = buflen; 1235 int pid = os::current_process_id(); 1236 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) { 1237 // buf already contains path name 1238 if (offset) *offset = addr - mi.base_addr; 1239 return true; 1240 } else { 1241 if (buf) buf[0] = '\0'; 1242 if (offset) *offset = -1; 1243 return false; 1244 } 1245} 1246 1247bool os::dll_address_to_function_name(address addr, char *buf, 1248 int buflen, int *offset) { 1249 // Unimplemented on Windows - in order to use SymGetSymFromAddr(), 1250 // we need to initialize imagehlp/dbghelp, then load symbol table 1251 // for every module. That's too much work to do after a fatal error. 1252 // For an example on how to implement this function, see 1.4.2. 1253 if (offset) *offset = -1; 1254 if (buf) buf[0] = '\0'; 1255 return false; 1256} 1257 1258// save the start and end address of jvm.dll into param[0] and param[1] 1259static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr, 1260 unsigned size, void * param) { 1261 if (!param) return -1; 1262 1263 if (base_addr <= (address)_locate_jvm_dll && 1264 base_addr+size > (address)_locate_jvm_dll) { 1265 ((address*)param)[0] = base_addr; 1266 ((address*)param)[1] = base_addr + size; 1267 return 1; 1268 } 1269 return 0; 1270} 1271 1272address vm_lib_location[2]; // start and end address of jvm.dll 1273 1274// check if addr is inside jvm.dll 1275bool os::address_is_in_vm(address addr) { 1276 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1277 int pid = os::current_process_id(); 1278 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) { 1279 assert(false, "Can't find jvm module."); 1280 return false; 1281 } 1282 } 1283 1284 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1285} 1286 1287// print module info; param is outputStream* 1288static int _print_module(int pid, char* fname, address base, 1289 unsigned size, void* param) { 1290 if (!param) return -1; 1291 1292 outputStream* st = (outputStream*)param; 1293 1294 address end_addr = base + size; 1295 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname); 1296 return 0; 1297} 1298 1299// Loads .dll/.so and 1300// in case of error it checks if .dll/.so was built for the 1301// same architecture as Hotspot is running on 1302void * os::dll_load(const char *name, char *ebuf, int ebuflen) 1303{ 1304 void * result = LoadLibrary(name); 1305 if (result != NULL) 1306 { 1307 return result; 1308 } 1309 1310 long errcode = GetLastError(); 1311 if (errcode == ERROR_MOD_NOT_FOUND) { 1312 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1); 1313 ebuf[ebuflen-1]='\0'; 1314 return NULL; 1315 } 1316 1317 // Parsing dll below 1318 // If we can read dll-info and find that dll was built 1319 // for an architecture other than Hotspot is running in 1320 // - then print to buffer "DLL was built for a different architecture" 1321 // else call getLastErrorString to obtain system error message 1322 1323 // Read system error message into ebuf 1324 // It may or may not be overwritten below (in the for loop and just above) 1325 getLastErrorString(ebuf, (size_t) ebuflen); 1326 ebuf[ebuflen-1]='\0'; 1327 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0); 1328 if (file_descriptor<0) 1329 { 1330 return NULL; 1331 } 1332 1333 uint32_t signature_offset; 1334 uint16_t lib_arch=0; 1335 bool failed_to_get_lib_arch= 1336 ( 1337 //Go to position 3c in the dll 1338 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0) 1339 || 1340 // Read loacation of signature 1341 (sizeof(signature_offset)!= 1342 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset)))) 1343 || 1344 //Go to COFF File Header in dll 1345 //that is located after"signature" (4 bytes long) 1346 (os::seek_to_file_offset(file_descriptor, 1347 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0) 1348 || 1349 //Read field that contains code of architecture 1350 // that dll was build for 1351 (sizeof(lib_arch)!= 1352 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch)))) 1353 ); 1354 1355 ::close(file_descriptor); 1356 if (failed_to_get_lib_arch) 1357 { 1358 // file i/o error - report getLastErrorString(...) msg 1359 return NULL; 1360 } 1361 1362 typedef struct 1363 { 1364 uint16_t arch_code; 1365 char* arch_name; 1366 } arch_t; 1367 1368 static const arch_t arch_array[]={ 1369 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1370 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1371 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1372 }; 1373 #if (defined _M_IA64) 1374 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64; 1375 #elif (defined _M_AMD64) 1376 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64; 1377 #elif (defined _M_IX86) 1378 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386; 1379 #else 1380 #error Method os::dll_load requires that one of following \ 1381 is defined :_M_IA64,_M_AMD64 or _M_IX86 1382 #endif 1383 1384 1385 // Obtain a string for printf operation 1386 // lib_arch_str shall contain string what platform this .dll was built for 1387 // running_arch_str shall string contain what platform Hotspot was built for 1388 char *running_arch_str=NULL,*lib_arch_str=NULL; 1389 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++) 1390 { 1391 if (lib_arch==arch_array[i].arch_code) 1392 lib_arch_str=arch_array[i].arch_name; 1393 if (running_arch==arch_array[i].arch_code) 1394 running_arch_str=arch_array[i].arch_name; 1395 } 1396 1397 assert(running_arch_str, 1398 "Didn't find runing architecture code in arch_array"); 1399 1400 // If the architure is right 1401 // but some other error took place - report getLastErrorString(...) msg 1402 if (lib_arch == running_arch) 1403 { 1404 return NULL; 1405 } 1406 1407 if (lib_arch_str!=NULL) 1408 { 1409 ::_snprintf(ebuf, ebuflen-1, 1410 "Can't load %s-bit .dll on a %s-bit platform", 1411 lib_arch_str,running_arch_str); 1412 } 1413 else 1414 { 1415 // don't know what architecture this dll was build for 1416 ::_snprintf(ebuf, ebuflen-1, 1417 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1418 lib_arch,running_arch_str); 1419 } 1420 1421 return NULL; 1422} 1423 1424 1425void os::print_dll_info(outputStream *st) { 1426 int pid = os::current_process_id(); 1427 st->print_cr("Dynamic libraries:"); 1428 enumerate_modules(pid, _print_module, (void *)st); 1429} 1430 1431void os::print_os_info(outputStream* st) { 1432 st->print("OS:"); 1433 1434 OSVERSIONINFOEX osvi; 1435 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1436 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1437 1438 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1439 st->print_cr("N/A"); 1440 return; 1441 } 1442 1443 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion; 1444 1445 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) { 1446 switch (os_vers) { 1447 case 3051: st->print(" Windows NT 3.51"); break; 1448 case 4000: st->print(" Windows NT 4.0"); break; 1449 case 5000: st->print(" Windows 2000"); break; 1450 case 5001: st->print(" Windows XP"); break; 1451 case 5002: st->print(" Windows Server 2003 family"); break; 1452 case 6000: st->print(" Windows Vista"); break; 1453 default: // future windows, print out its major and minor versions 1454 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1455 } 1456 } else { 1457 switch (os_vers) { 1458 case 4000: st->print(" Windows 95"); break; 1459 case 4010: st->print(" Windows 98"); break; 1460 case 4090: st->print(" Windows Me"); break; 1461 default: // future windows, print out its major and minor versions 1462 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1463 } 1464 } 1465 1466 st->print(" Build %d", osvi.dwBuildNumber); 1467 st->print(" %s", osvi.szCSDVersion); // service pack 1468 st->cr(); 1469} 1470 1471void os::print_memory_info(outputStream* st) { 1472 st->print("Memory:"); 1473 st->print(" %dk page", os::vm_page_size()>>10); 1474 1475 // FIXME: GlobalMemoryStatus() may return incorrect value if total memory 1476 // is larger than 4GB 1477 MEMORYSTATUS ms; 1478 GlobalMemoryStatus(&ms); 1479 1480 st->print(", physical %uk", os::physical_memory() >> 10); 1481 st->print("(%uk free)", os::available_memory() >> 10); 1482 1483 st->print(", swap %uk", ms.dwTotalPageFile >> 10); 1484 st->print("(%uk free)", ms.dwAvailPageFile >> 10); 1485 st->cr(); 1486} 1487 1488void os::print_siginfo(outputStream *st, void *siginfo) { 1489 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1490 st->print("siginfo:"); 1491 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1492 1493 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1494 er->NumberParameters >= 2) { 1495 switch (er->ExceptionInformation[0]) { 1496 case 0: st->print(", reading address"); break; 1497 case 1: st->print(", writing address"); break; 1498 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1499 er->ExceptionInformation[0]); 1500 } 1501 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1502 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1503 er->NumberParameters >= 2 && UseSharedSpaces) { 1504 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1505 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1506 st->print("\n\nError accessing class data sharing archive." \ 1507 " Mapped file inaccessible during execution, " \ 1508 " possible disk/network problem."); 1509 } 1510 } else { 1511 int num = er->NumberParameters; 1512 if (num > 0) { 1513 st->print(", ExceptionInformation="); 1514 for (int i = 0; i < num; i++) { 1515 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1516 } 1517 } 1518 } 1519 st->cr(); 1520} 1521 1522void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1523 // do nothing 1524} 1525 1526static char saved_jvm_path[MAX_PATH] = {0}; 1527 1528// Find the full path to the current module, jvm.dll or jvm_g.dll 1529void os::jvm_path(char *buf, jint buflen) { 1530 // Error checking. 1531 if (buflen < MAX_PATH) { 1532 assert(false, "must use a large-enough buffer"); 1533 buf[0] = '\0'; 1534 return; 1535 } 1536 // Lazy resolve the path to current module. 1537 if (saved_jvm_path[0] != 0) { 1538 strcpy(buf, saved_jvm_path); 1539 return; 1540 } 1541 1542 GetModuleFileName(vm_lib_handle, buf, buflen); 1543 strcpy(saved_jvm_path, buf); 1544} 1545 1546 1547void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1548#ifndef _WIN64 1549 st->print("_"); 1550#endif 1551} 1552 1553 1554void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1555#ifndef _WIN64 1556 st->print("@%d", args_size * sizeof(int)); 1557#endif 1558} 1559 1560// sun.misc.Signal 1561// NOTE that this is a workaround for an apparent kernel bug where if 1562// a signal handler for SIGBREAK is installed then that signal handler 1563// takes priority over the console control handler for CTRL_CLOSE_EVENT. 1564// See bug 4416763. 1565static void (*sigbreakHandler)(int) = NULL; 1566 1567static void UserHandler(int sig, void *siginfo, void *context) { 1568 os::signal_notify(sig); 1569 // We need to reinstate the signal handler each time... 1570 os::signal(sig, (void*)UserHandler); 1571} 1572 1573void* os::user_handler() { 1574 return (void*) UserHandler; 1575} 1576 1577void* os::signal(int signal_number, void* handler) { 1578 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1579 void (*oldHandler)(int) = sigbreakHandler; 1580 sigbreakHandler = (void (*)(int)) handler; 1581 return (void*) oldHandler; 1582 } else { 1583 return (void*)::signal(signal_number, (void (*)(int))handler); 1584 } 1585} 1586 1587void os::signal_raise(int signal_number) { 1588 raise(signal_number); 1589} 1590 1591// The Win32 C runtime library maps all console control events other than ^C 1592// into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1593// logoff, and shutdown events. We therefore install our own console handler 1594// that raises SIGTERM for the latter cases. 1595// 1596static BOOL WINAPI consoleHandler(DWORD event) { 1597 switch(event) { 1598 case CTRL_C_EVENT: 1599 if (is_error_reported()) { 1600 // Ctrl-C is pressed during error reporting, likely because the error 1601 // handler fails to abort. Let VM die immediately. 1602 os::die(); 1603 } 1604 1605 os::signal_raise(SIGINT); 1606 return TRUE; 1607 break; 1608 case CTRL_BREAK_EVENT: 1609 if (sigbreakHandler != NULL) { 1610 (*sigbreakHandler)(SIGBREAK); 1611 } 1612 return TRUE; 1613 break; 1614 case CTRL_CLOSE_EVENT: 1615 case CTRL_LOGOFF_EVENT: 1616 case CTRL_SHUTDOWN_EVENT: 1617 os::signal_raise(SIGTERM); 1618 return TRUE; 1619 break; 1620 default: 1621 break; 1622 } 1623 return FALSE; 1624} 1625 1626/* 1627 * The following code is moved from os.cpp for making this 1628 * code platform specific, which it is by its very nature. 1629 */ 1630 1631// Return maximum OS signal used + 1 for internal use only 1632// Used as exit signal for signal_thread 1633int os::sigexitnum_pd(){ 1634 return NSIG; 1635} 1636 1637// a counter for each possible signal value, including signal_thread exit signal 1638static volatile jint pending_signals[NSIG+1] = { 0 }; 1639static HANDLE sig_sem; 1640 1641void os::signal_init_pd() { 1642 // Initialize signal structures 1643 memset((void*)pending_signals, 0, sizeof(pending_signals)); 1644 1645 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 1646 1647 // Programs embedding the VM do not want it to attempt to receive 1648 // events like CTRL_LOGOFF_EVENT, which are used to implement the 1649 // shutdown hooks mechanism introduced in 1.3. For example, when 1650 // the VM is run as part of a Windows NT service (i.e., a servlet 1651 // engine in a web server), the correct behavior is for any console 1652 // control handler to return FALSE, not TRUE, because the OS's 1653 // "final" handler for such events allows the process to continue if 1654 // it is a service (while terminating it if it is not a service). 1655 // To make this behavior uniform and the mechanism simpler, we 1656 // completely disable the VM's usage of these console events if -Xrs 1657 // (=ReduceSignalUsage) is specified. This means, for example, that 1658 // the CTRL-BREAK thread dump mechanism is also disabled in this 1659 // case. See bugs 4323062, 4345157, and related bugs. 1660 1661 if (!ReduceSignalUsage) { 1662 // Add a CTRL-C handler 1663 SetConsoleCtrlHandler(consoleHandler, TRUE); 1664 } 1665} 1666 1667void os::signal_notify(int signal_number) { 1668 BOOL ret; 1669 1670 Atomic::inc(&pending_signals[signal_number]); 1671 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 1672 assert(ret != 0, "ReleaseSemaphore() failed"); 1673} 1674 1675static int check_pending_signals(bool wait_for_signal) { 1676 DWORD ret; 1677 while (true) { 1678 for (int i = 0; i < NSIG + 1; i++) { 1679 jint n = pending_signals[i]; 1680 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1681 return i; 1682 } 1683 } 1684 if (!wait_for_signal) { 1685 return -1; 1686 } 1687 1688 JavaThread *thread = JavaThread::current(); 1689 1690 ThreadBlockInVM tbivm(thread); 1691 1692 bool threadIsSuspended; 1693 do { 1694 thread->set_suspend_equivalent(); 1695 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1696 ret = ::WaitForSingleObject(sig_sem, INFINITE); 1697 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 1698 1699 // were we externally suspended while we were waiting? 1700 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1701 if (threadIsSuspended) { 1702 // 1703 // The semaphore has been incremented, but while we were waiting 1704 // another thread suspended us. We don't want to continue running 1705 // while suspended because that would surprise the thread that 1706 // suspended us. 1707 // 1708 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 1709 assert(ret != 0, "ReleaseSemaphore() failed"); 1710 1711 thread->java_suspend_self(); 1712 } 1713 } while (threadIsSuspended); 1714 } 1715} 1716 1717int os::signal_lookup() { 1718 return check_pending_signals(false); 1719} 1720 1721int os::signal_wait() { 1722 return check_pending_signals(true); 1723} 1724 1725// Implicit OS exception handling 1726 1727LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) { 1728 JavaThread* thread = JavaThread::current(); 1729 // Save pc in thread 1730#ifdef _M_IA64 1731 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP); 1732 // Set pc to handler 1733 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 1734#elif _M_AMD64 1735 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip); 1736 // Set pc to handler 1737 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 1738#else 1739 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip); 1740 // Set pc to handler 1741 exceptionInfo->ContextRecord->Eip = (LONG)handler; 1742#endif 1743 1744 // Continue the execution 1745 return EXCEPTION_CONTINUE_EXECUTION; 1746} 1747 1748 1749// Used for PostMortemDump 1750extern "C" void safepoints(); 1751extern "C" void find(int x); 1752extern "C" void events(); 1753 1754// According to Windows API documentation, an illegal instruction sequence should generate 1755// the 0xC000001C exception code. However, real world experience shows that occasionnaly 1756// the execution of an illegal instruction can generate the exception code 0xC000001E. This 1757// seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 1758 1759#define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 1760 1761// From "Execution Protection in the Windows Operating System" draft 0.35 1762// Once a system header becomes available, the "real" define should be 1763// included or copied here. 1764#define EXCEPTION_INFO_EXEC_VIOLATION 0x08 1765 1766#define def_excpt(val) #val, val 1767 1768struct siglabel { 1769 char *name; 1770 int number; 1771}; 1772 1773struct siglabel exceptlabels[] = { 1774 def_excpt(EXCEPTION_ACCESS_VIOLATION), 1775 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 1776 def_excpt(EXCEPTION_BREAKPOINT), 1777 def_excpt(EXCEPTION_SINGLE_STEP), 1778 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 1779 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 1780 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 1781 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 1782 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 1783 def_excpt(EXCEPTION_FLT_OVERFLOW), 1784 def_excpt(EXCEPTION_FLT_STACK_CHECK), 1785 def_excpt(EXCEPTION_FLT_UNDERFLOW), 1786 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 1787 def_excpt(EXCEPTION_INT_OVERFLOW), 1788 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 1789 def_excpt(EXCEPTION_IN_PAGE_ERROR), 1790 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 1791 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 1792 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 1793 def_excpt(EXCEPTION_STACK_OVERFLOW), 1794 def_excpt(EXCEPTION_INVALID_DISPOSITION), 1795 def_excpt(EXCEPTION_GUARD_PAGE), 1796 def_excpt(EXCEPTION_INVALID_HANDLE), 1797 NULL, 0 1798}; 1799 1800const char* os::exception_name(int exception_code, char *buf, size_t size) { 1801 for (int i = 0; exceptlabels[i].name != NULL; i++) { 1802 if (exceptlabels[i].number == exception_code) { 1803 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 1804 return buf; 1805 } 1806 } 1807 1808 return NULL; 1809} 1810 1811//----------------------------------------------------------------------------- 1812LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 1813 // handle exception caused by idiv; should only happen for -MinInt/-1 1814 // (division by zero is handled explicitly) 1815#ifdef _M_IA64 1816 assert(0, "Fix Handle_IDiv_Exception"); 1817#elif _M_AMD64 1818 PCONTEXT ctx = exceptionInfo->ContextRecord; 1819 address pc = (address)ctx->Rip; 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->Rax == min_jint, "unexpected idiv exception"); 1824 // set correct result values and continue after idiv instruction 1825 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 1826 ctx->Rax = (DWORD)min_jint; // result 1827 ctx->Rdx = (DWORD)0; // remainder 1828 // Continue the execution 1829#else 1830 PCONTEXT ctx = exceptionInfo->ContextRecord; 1831 address pc = (address)ctx->Eip; 1832 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc)); 1833 assert(pc[0] == 0xF7, "not an idiv opcode"); 1834 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 1835 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 1836 // set correct result values and continue after idiv instruction 1837 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 1838 ctx->Eax = (DWORD)min_jint; // result 1839 ctx->Edx = (DWORD)0; // remainder 1840 // Continue the execution 1841#endif 1842 return EXCEPTION_CONTINUE_EXECUTION; 1843} 1844 1845#ifndef _WIN64 1846//----------------------------------------------------------------------------- 1847LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 1848 // handle exception caused by native mothod modifying control word 1849 PCONTEXT ctx = exceptionInfo->ContextRecord; 1850 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 1851 1852 switch (exception_code) { 1853 case EXCEPTION_FLT_DENORMAL_OPERAND: 1854 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 1855 case EXCEPTION_FLT_INEXACT_RESULT: 1856 case EXCEPTION_FLT_INVALID_OPERATION: 1857 case EXCEPTION_FLT_OVERFLOW: 1858 case EXCEPTION_FLT_STACK_CHECK: 1859 case EXCEPTION_FLT_UNDERFLOW: 1860 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 1861 if (fp_control_word != ctx->FloatSave.ControlWord) { 1862 // Restore FPCW and mask out FLT exceptions 1863 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 1864 // Mask out pending FLT exceptions 1865 ctx->FloatSave.StatusWord &= 0xffffff00; 1866 return EXCEPTION_CONTINUE_EXECUTION; 1867 } 1868 } 1869 return EXCEPTION_CONTINUE_SEARCH; 1870} 1871#else //_WIN64 1872/* 1873 On Windows, the mxcsr control bits are non-volatile across calls 1874 See also CR 6192333 1875 If EXCEPTION_FLT_* happened after some native method modified 1876 mxcsr - it is not a jvm fault. 1877 However should we decide to restore of mxcsr after a faulty 1878 native method we can uncomment following code 1879 jint MxCsr = INITIAL_MXCSR; 1880 // we can't use StubRoutines::addr_mxcsr_std() 1881 // because in Win64 mxcsr is not saved there 1882 if (MxCsr != ctx->MxCsr) { 1883 ctx->MxCsr = MxCsr; 1884 return EXCEPTION_CONTINUE_EXECUTION; 1885 } 1886 1887*/ 1888#endif //_WIN64 1889 1890 1891// Fatal error reporting is single threaded so we can make this a 1892// static and preallocated. If it's more than MAX_PATH silently ignore 1893// it. 1894static char saved_error_file[MAX_PATH] = {0}; 1895 1896void os::set_error_file(const char *logfile) { 1897 if (strlen(logfile) <= MAX_PATH) { 1898 strncpy(saved_error_file, logfile, MAX_PATH); 1899 } 1900} 1901 1902static inline void report_error(Thread* t, DWORD exception_code, 1903 address addr, void* siginfo, void* context) { 1904 VMError err(t, exception_code, addr, siginfo, context); 1905 err.report_and_die(); 1906 1907 // If UseOsErrorReporting, this will return here and save the error file 1908 // somewhere where we can find it in the minidump. 1909} 1910 1911//----------------------------------------------------------------------------- 1912LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 1913 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 1914 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 1915#ifdef _M_IA64 1916 address pc = (address) exceptionInfo->ContextRecord->StIIP; 1917#elif _M_AMD64 1918 address pc = (address) exceptionInfo->ContextRecord->Rip; 1919#else 1920 address pc = (address) exceptionInfo->ContextRecord->Eip; 1921#endif 1922 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 1923 1924#ifndef _WIN64 1925 // Execution protection violation - win32 running on AMD64 only 1926 // Handled first to avoid misdiagnosis as a "normal" access violation; 1927 // This is safe to do because we have a new/unique ExceptionInformation 1928 // code for this condition. 1929 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 1930 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 1931 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 1932 address addr = (address) exceptionRecord->ExceptionInformation[1]; 1933 1934 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 1935 int page_size = os::vm_page_size(); 1936 1937 // Make sure the pc and the faulting address are sane. 1938 // 1939 // If an instruction spans a page boundary, and the page containing 1940 // the beginning of the instruction is executable but the following 1941 // page is not, the pc and the faulting address might be slightly 1942 // different - we still want to unguard the 2nd page in this case. 1943 // 1944 // 15 bytes seems to be a (very) safe value for max instruction size. 1945 bool pc_is_near_addr = 1946 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 1947 bool instr_spans_page_boundary = 1948 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 1949 (intptr_t) page_size) > 0); 1950 1951 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 1952 static volatile address last_addr = 1953 (address) os::non_memory_address_word(); 1954 1955 // In conservative mode, don't unguard unless the address is in the VM 1956 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 1957 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 1958 1959 // Unguard and retry 1960 address page_start = 1961 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 1962 bool res = os::unguard_memory((char*) page_start, page_size); 1963 1964 if (PrintMiscellaneous && Verbose) { 1965 char buf[256]; 1966 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 1967 "at " INTPTR_FORMAT 1968 ", unguarding " INTPTR_FORMAT ": %s", addr, 1969 page_start, (res ? "success" : strerror(errno))); 1970 tty->print_raw_cr(buf); 1971 } 1972 1973 // Set last_addr so if we fault again at the same address, we don't 1974 // end up in an endless loop. 1975 // 1976 // There are two potential complications here. Two threads trapping 1977 // at the same address at the same time could cause one of the 1978 // threads to think it already unguarded, and abort the VM. Likely 1979 // very rare. 1980 // 1981 // The other race involves two threads alternately trapping at 1982 // different addresses and failing to unguard the page, resulting in 1983 // an endless loop. This condition is probably even more unlikely 1984 // than the first. 1985 // 1986 // Although both cases could be avoided by using locks or thread 1987 // local last_addr, these solutions are unnecessary complication: 1988 // this handler is a best-effort safety net, not a complete solution. 1989 // It is disabled by default and should only be used as a workaround 1990 // in case we missed any no-execute-unsafe VM code. 1991 1992 last_addr = addr; 1993 1994 return EXCEPTION_CONTINUE_EXECUTION; 1995 } 1996 } 1997 1998 // Last unguard failed or not unguarding 1999 tty->print_raw_cr("Execution protection violation"); 2000 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2001 exceptionInfo->ContextRecord); 2002 return EXCEPTION_CONTINUE_SEARCH; 2003 } 2004 } 2005#endif // _WIN64 2006 2007 // Check to see if we caught the safepoint code in the 2008 // process of write protecting the memory serialization page. 2009 // It write enables the page immediately after protecting it 2010 // so just return. 2011 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { 2012 JavaThread* thread = (JavaThread*) t; 2013 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2014 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2015 if ( os::is_memory_serialize_page(thread, addr) ) { 2016 // Block current thread until the memory serialize page permission restored. 2017 os::block_on_serialize_page_trap(); 2018 return EXCEPTION_CONTINUE_EXECUTION; 2019 } 2020 } 2021 2022 2023 if (t != NULL && t->is_Java_thread()) { 2024 JavaThread* thread = (JavaThread*) t; 2025 bool in_java = thread->thread_state() == _thread_in_Java; 2026 2027 // Handle potential stack overflows up front. 2028 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2029 if (os::uses_stack_guard_pages()) { 2030#ifdef _M_IA64 2031 // 2032 // If it's a legal stack address continue, Windows will map it in. 2033 // 2034 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2035 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2036 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) 2037 return EXCEPTION_CONTINUE_EXECUTION; 2038 2039 // The register save area is the same size as the memory stack 2040 // and starts at the page just above the start of the memory stack. 2041 // If we get a fault in this area, we've run out of register 2042 // stack. If we are in java, try throwing a stack overflow exception. 2043 if (addr > thread->stack_base() && 2044 addr <= (thread->stack_base()+thread->stack_size()) ) { 2045 char buf[256]; 2046 jio_snprintf(buf, sizeof(buf), 2047 "Register stack overflow, addr:%p, stack_base:%p\n", 2048 addr, thread->stack_base() ); 2049 tty->print_raw_cr(buf); 2050 // If not in java code, return and hope for the best. 2051 return in_java ? Handle_Exception(exceptionInfo, 2052 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2053 : EXCEPTION_CONTINUE_EXECUTION; 2054 } 2055#endif 2056 if (thread->stack_yellow_zone_enabled()) { 2057 // Yellow zone violation. The o/s has unprotected the first yellow 2058 // zone page for us. Note: must call disable_stack_yellow_zone to 2059 // update the enabled status, even if the zone contains only one page. 2060 thread->disable_stack_yellow_zone(); 2061 // If not in java code, return and hope for the best. 2062 return in_java ? Handle_Exception(exceptionInfo, 2063 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2064 : EXCEPTION_CONTINUE_EXECUTION; 2065 } else { 2066 // Fatal red zone violation. 2067 thread->disable_stack_red_zone(); 2068 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2069 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2070 exceptionInfo->ContextRecord); 2071 return EXCEPTION_CONTINUE_SEARCH; 2072 } 2073 } else if (in_java) { 2074 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2075 // a one-time-only guard page, which it has released to us. The next 2076 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2077 return Handle_Exception(exceptionInfo, 2078 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2079 } else { 2080 // Can only return and hope for the best. Further stack growth will 2081 // result in an ACCESS_VIOLATION. 2082 return EXCEPTION_CONTINUE_EXECUTION; 2083 } 2084 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2085 // Either stack overflow or null pointer exception. 2086 if (in_java) { 2087 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2088 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2089 address stack_end = thread->stack_base() - thread->stack_size(); 2090 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2091 // Stack overflow. 2092 assert(!os::uses_stack_guard_pages(), 2093 "should be caught by red zone code above."); 2094 return Handle_Exception(exceptionInfo, 2095 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2096 } 2097 // 2098 // Check for safepoint polling and implicit null 2099 // We only expect null pointers in the stubs (vtable) 2100 // the rest are checked explicitly now. 2101 // 2102 CodeBlob* cb = CodeCache::find_blob(pc); 2103 if (cb != NULL) { 2104 if (os::is_poll_address(addr)) { 2105 address stub = SharedRuntime::get_poll_stub(pc); 2106 return Handle_Exception(exceptionInfo, stub); 2107 } 2108 } 2109 { 2110#ifdef _WIN64 2111 // 2112 // If it's a legal stack address map the entire region in 2113 // 2114 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2115 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2116 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) { 2117 addr = (address)((uintptr_t)addr & 2118 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2119 os::commit_memory( (char *)addr, thread->stack_base() - addr ); 2120 return EXCEPTION_CONTINUE_EXECUTION; 2121 } 2122 else 2123#endif 2124 { 2125 // Null pointer exception. 2126#ifdef _M_IA64 2127 // We catch register stack overflows in compiled code by doing 2128 // an explicit compare and executing a st8(G0, G0) if the 2129 // BSP enters into our guard area. We test for the overflow 2130 // condition and fall into the normal null pointer exception 2131 // code if BSP hasn't overflowed. 2132 if ( in_java ) { 2133 if(thread->register_stack_overflow()) { 2134 assert((address)exceptionInfo->ContextRecord->IntS3 == 2135 thread->register_stack_limit(), 2136 "GR7 doesn't contain register_stack_limit"); 2137 // Disable the yellow zone which sets the state that 2138 // we've got a stack overflow problem. 2139 if (thread->stack_yellow_zone_enabled()) { 2140 thread->disable_stack_yellow_zone(); 2141 } 2142 // Give us some room to process the exception 2143 thread->disable_register_stack_guard(); 2144 // Update GR7 with the new limit so we can continue running 2145 // compiled code. 2146 exceptionInfo->ContextRecord->IntS3 = 2147 (ULONGLONG)thread->register_stack_limit(); 2148 return Handle_Exception(exceptionInfo, 2149 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2150 } else { 2151 // 2152 // Check for implicit null 2153 // We only expect null pointers in the stubs (vtable) 2154 // the rest are checked explicitly now. 2155 // 2156 CodeBlob* cb = CodeCache::find_blob(pc); 2157 if (cb != NULL) { 2158 if (VtableStubs::stub_containing(pc) != NULL) { 2159 if (((uintptr_t)addr) < os::vm_page_size() ) { 2160 // an access to the first page of VM--assume it is a null pointer 2161 return Handle_Exception(exceptionInfo, 2162 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL)); 2163 } 2164 } 2165 } 2166 } 2167 } // in_java 2168 2169 // IA64 doesn't use implicit null checking yet. So we shouldn't 2170 // get here. 2171 tty->print_raw_cr("Access violation, possible null pointer exception"); 2172 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2173 exceptionInfo->ContextRecord); 2174 return EXCEPTION_CONTINUE_SEARCH; 2175#else /* !IA64 */ 2176 2177 // Windows 98 reports faulting addresses incorrectly 2178 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2179 !os::win32::is_nt()) { 2180 return Handle_Exception(exceptionInfo, 2181 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL)); 2182 } 2183 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2184 exceptionInfo->ContextRecord); 2185 return EXCEPTION_CONTINUE_SEARCH; 2186#endif 2187 } 2188 } 2189 } 2190 2191#ifdef _WIN64 2192 // Special care for fast JNI field accessors. 2193 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2194 // in and the heap gets shrunk before the field access. 2195 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2196 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2197 if (addr != (address)-1) { 2198 return Handle_Exception(exceptionInfo, addr); 2199 } 2200 } 2201#endif 2202 2203#ifdef _WIN64 2204 // Windows will sometimes generate an access violation 2205 // when we call malloc. Since we use VectoredExceptions 2206 // on 64 bit platforms, we see this exception. We must 2207 // pass this exception on so Windows can recover. 2208 // We check to see if the pc of the fault is in NTDLL.DLL 2209 // if so, we pass control on to Windows for handling. 2210 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH; 2211#endif 2212 2213 // Stack overflow or null pointer exception in native code. 2214 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2215 exceptionInfo->ContextRecord); 2216 return EXCEPTION_CONTINUE_SEARCH; 2217 } 2218 2219 if (in_java) { 2220 switch (exception_code) { 2221 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2222 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2223 2224 case EXCEPTION_INT_OVERFLOW: 2225 return Handle_IDiv_Exception(exceptionInfo); 2226 2227 } // switch 2228 } 2229#ifndef _WIN64 2230 if ((thread->thread_state() == _thread_in_Java) || 2231 (thread->thread_state() == _thread_in_native) ) 2232 { 2233 LONG result=Handle_FLT_Exception(exceptionInfo); 2234 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2235 } 2236#endif //_WIN64 2237 } 2238 2239 if (exception_code != EXCEPTION_BREAKPOINT) { 2240#ifndef _WIN64 2241 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2242 exceptionInfo->ContextRecord); 2243#else 2244 // Itanium Windows uses a VectoredExceptionHandler 2245 // Which means that C++ programatic exception handlers (try/except) 2246 // will get here. Continue the search for the right except block if 2247 // the exception code is not a fatal code. 2248 switch ( exception_code ) { 2249 case EXCEPTION_ACCESS_VIOLATION: 2250 case EXCEPTION_STACK_OVERFLOW: 2251 case EXCEPTION_ILLEGAL_INSTRUCTION: 2252 case EXCEPTION_ILLEGAL_INSTRUCTION_2: 2253 case EXCEPTION_INT_OVERFLOW: 2254 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2255 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2256 exceptionInfo->ContextRecord); 2257 } 2258 break; 2259 default: 2260 break; 2261 } 2262#endif 2263 } 2264 return EXCEPTION_CONTINUE_SEARCH; 2265} 2266 2267#ifndef _WIN64 2268// Special care for fast JNI accessors. 2269// jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2270// the heap gets shrunk before the field access. 2271// Need to install our own structured exception handler since native code may 2272// install its own. 2273LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2274 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2275 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2276 address pc = (address) exceptionInfo->ContextRecord->Eip; 2277 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2278 if (addr != (address)-1) { 2279 return Handle_Exception(exceptionInfo, addr); 2280 } 2281 } 2282 return EXCEPTION_CONTINUE_SEARCH; 2283} 2284 2285#define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \ 2286Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \ 2287 __try { \ 2288 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \ 2289 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \ 2290 } \ 2291 return 0; \ 2292} 2293 2294DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2295DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2296DEFINE_FAST_GETFIELD(jchar, char, Char) 2297DEFINE_FAST_GETFIELD(jshort, short, Short) 2298DEFINE_FAST_GETFIELD(jint, int, Int) 2299DEFINE_FAST_GETFIELD(jlong, long, Long) 2300DEFINE_FAST_GETFIELD(jfloat, float, Float) 2301DEFINE_FAST_GETFIELD(jdouble, double, Double) 2302 2303address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2304 switch (type) { 2305 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2306 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2307 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2308 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2309 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2310 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2311 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2312 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2313 default: ShouldNotReachHere(); 2314 } 2315 return (address)-1; 2316} 2317#endif 2318 2319// Virtual Memory 2320 2321int os::vm_page_size() { return os::win32::vm_page_size(); } 2322int os::vm_allocation_granularity() { 2323 return os::win32::vm_allocation_granularity(); 2324} 2325 2326// Windows large page support is available on Windows 2003. In order to use 2327// large page memory, the administrator must first assign additional privilege 2328// to the user: 2329// + select Control Panel -> Administrative Tools -> Local Security Policy 2330// + select Local Policies -> User Rights Assignment 2331// + double click "Lock pages in memory", add users and/or groups 2332// + reboot 2333// Note the above steps are needed for administrator as well, as administrators 2334// by default do not have the privilege to lock pages in memory. 2335// 2336// Note about Windows 2003: although the API supports committing large page 2337// memory on a page-by-page basis and VirtualAlloc() returns success under this 2338// scenario, I found through experiment it only uses large page if the entire 2339// memory region is reserved and committed in a single VirtualAlloc() call. 2340// This makes Windows large page support more or less like Solaris ISM, in 2341// that the entire heap must be committed upfront. This probably will change 2342// in the future, if so the code below needs to be revisited. 2343 2344#ifndef MEM_LARGE_PAGES 2345#define MEM_LARGE_PAGES 0x20000000 2346#endif 2347 2348// GetLargePageMinimum is only available on Windows 2003. The other functions 2349// are available on NT but not on Windows 98/Me. We have to resolve them at 2350// runtime. 2351typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void); 2352typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type) 2353 (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 2354typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE); 2355typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID); 2356 2357static GetLargePageMinimum_func_type _GetLargePageMinimum; 2358static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges; 2359static OpenProcessToken_func_type _OpenProcessToken; 2360static LookupPrivilegeValue_func_type _LookupPrivilegeValue; 2361 2362static HINSTANCE _kernel32; 2363static HINSTANCE _advapi32; 2364static HANDLE _hProcess; 2365static HANDLE _hToken; 2366 2367static size_t _large_page_size = 0; 2368 2369static bool resolve_functions_for_large_page_init() { 2370 _kernel32 = LoadLibrary("kernel32.dll"); 2371 if (_kernel32 == NULL) return false; 2372 2373 _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type, 2374 GetProcAddress(_kernel32, "GetLargePageMinimum")); 2375 if (_GetLargePageMinimum == NULL) return false; 2376 2377 _advapi32 = LoadLibrary("advapi32.dll"); 2378 if (_advapi32 == NULL) return false; 2379 2380 _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type, 2381 GetProcAddress(_advapi32, "AdjustTokenPrivileges")); 2382 _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type, 2383 GetProcAddress(_advapi32, "OpenProcessToken")); 2384 _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type, 2385 GetProcAddress(_advapi32, "LookupPrivilegeValueA")); 2386 return _AdjustTokenPrivileges != NULL && 2387 _OpenProcessToken != NULL && 2388 _LookupPrivilegeValue != NULL; 2389} 2390 2391static bool request_lock_memory_privilege() { 2392 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2393 os::current_process_id()); 2394 2395 LUID luid; 2396 if (_hProcess != NULL && 2397 _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2398 _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2399 2400 TOKEN_PRIVILEGES tp; 2401 tp.PrivilegeCount = 1; 2402 tp.Privileges[0].Luid = luid; 2403 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2404 2405 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2406 // privilege. Check GetLastError() too. See MSDN document. 2407 if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2408 (GetLastError() == ERROR_SUCCESS)) { 2409 return true; 2410 } 2411 } 2412 2413 return false; 2414} 2415 2416static void cleanup_after_large_page_init() { 2417 _GetLargePageMinimum = NULL; 2418 _AdjustTokenPrivileges = NULL; 2419 _OpenProcessToken = NULL; 2420 _LookupPrivilegeValue = NULL; 2421 if (_kernel32) FreeLibrary(_kernel32); 2422 _kernel32 = NULL; 2423 if (_advapi32) FreeLibrary(_advapi32); 2424 _advapi32 = NULL; 2425 if (_hProcess) CloseHandle(_hProcess); 2426 _hProcess = NULL; 2427 if (_hToken) CloseHandle(_hToken); 2428 _hToken = NULL; 2429} 2430 2431bool os::large_page_init() { 2432 if (!UseLargePages) return false; 2433 2434 // print a warning if any large page related flag is specified on command line 2435 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2436 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2437 bool success = false; 2438 2439# define WARN(msg) if (warn_on_failure) { warning(msg); } 2440 if (resolve_functions_for_large_page_init()) { 2441 if (request_lock_memory_privilege()) { 2442 size_t s = _GetLargePageMinimum(); 2443 if (s) { 2444#if defined(IA32) || defined(AMD64) 2445 if (s > 4*M || LargePageSizeInBytes > 4*M) { 2446 WARN("JVM cannot use large pages bigger than 4mb."); 2447 } else { 2448#endif 2449 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 2450 _large_page_size = LargePageSizeInBytes; 2451 } else { 2452 _large_page_size = s; 2453 } 2454 success = true; 2455#if defined(IA32) || defined(AMD64) 2456 } 2457#endif 2458 } else { 2459 WARN("Large page is not supported by the processor."); 2460 } 2461 } else { 2462 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 2463 } 2464 } else { 2465 WARN("Large page is not supported by the operating system."); 2466 } 2467#undef WARN 2468 2469 const size_t default_page_size = (size_t) vm_page_size(); 2470 if (success && _large_page_size > default_page_size) { 2471 _page_sizes[0] = _large_page_size; 2472 _page_sizes[1] = default_page_size; 2473 _page_sizes[2] = 0; 2474 } 2475 2476 cleanup_after_large_page_init(); 2477 return success; 2478} 2479 2480// On win32, one cannot release just a part of reserved memory, it's an 2481// all or nothing deal. When we split a reservation, we must break the 2482// reservation into two reservations. 2483void os::split_reserved_memory(char *base, size_t size, size_t split, 2484 bool realloc) { 2485 if (size > 0) { 2486 release_memory(base, size); 2487 if (realloc) { 2488 reserve_memory(split, base); 2489 } 2490 if (size != split) { 2491 reserve_memory(size - split, base + split); 2492 } 2493 } 2494} 2495 2496char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 2497 assert((size_t)addr % os::vm_allocation_granularity() == 0, 2498 "reserve alignment"); 2499 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size"); 2500 char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, 2501 PAGE_EXECUTE_READWRITE); 2502 assert(res == NULL || addr == NULL || addr == res, 2503 "Unexpected address from reserve."); 2504 return res; 2505} 2506 2507// Reserve memory at an arbitrary address, only if that area is 2508// available (and not reserved for something else). 2509char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2510 // Windows os::reserve_memory() fails of the requested address range is 2511 // not avilable. 2512 return reserve_memory(bytes, requested_addr); 2513} 2514 2515size_t os::large_page_size() { 2516 return _large_page_size; 2517} 2518 2519bool os::can_commit_large_page_memory() { 2520 // Windows only uses large page memory when the entire region is reserved 2521 // and committed in a single VirtualAlloc() call. This may change in the 2522 // future, but with Windows 2003 it's not possible to commit on demand. 2523 return false; 2524} 2525 2526char* os::reserve_memory_special(size_t bytes) { 2527 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 2528 char * res = (char *)VirtualAlloc(NULL, bytes, flag, PAGE_READWRITE); 2529 return res; 2530} 2531 2532bool os::release_memory_special(char* base, size_t bytes) { 2533 return release_memory(base, bytes); 2534} 2535 2536void os::print_statistics() { 2537} 2538 2539bool os::commit_memory(char* addr, size_t bytes) { 2540 if (bytes == 0) { 2541 // Don't bother the OS with noops. 2542 return true; 2543 } 2544 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 2545 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 2546 // Don't attempt to print anything if the OS call fails. We're 2547 // probably low on resources, so the print itself may cause crashes. 2548 return VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_EXECUTE_READWRITE) != NULL; 2549} 2550 2551bool os::commit_memory(char* addr, size_t size, size_t alignment_hint) { 2552 return commit_memory(addr, size); 2553} 2554 2555bool os::uncommit_memory(char* addr, size_t bytes) { 2556 if (bytes == 0) { 2557 // Don't bother the OS with noops. 2558 return true; 2559 } 2560 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 2561 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 2562 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0; 2563} 2564 2565bool os::release_memory(char* addr, size_t bytes) { 2566 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 2567} 2568 2569bool os::protect_memory(char* addr, size_t bytes) { 2570 DWORD old_status; 2571 return VirtualProtect(addr, bytes, PAGE_READONLY, &old_status) != 0; 2572} 2573 2574bool os::guard_memory(char* addr, size_t bytes) { 2575 DWORD old_status; 2576 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE | PAGE_GUARD, &old_status) != 0; 2577} 2578 2579bool os::unguard_memory(char* addr, size_t bytes) { 2580 DWORD old_status; 2581 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &old_status) != 0; 2582} 2583 2584void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 2585void os::free_memory(char *addr, size_t bytes) { } 2586void os::numa_make_global(char *addr, size_t bytes) { } 2587void os::numa_make_local(char *addr, size_t bytes) { } 2588bool os::numa_topology_changed() { return false; } 2589size_t os::numa_get_groups_num() { return 1; } 2590int os::numa_get_group_id() { return 0; } 2591size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2592 if (size > 0) { 2593 ids[0] = 0; 2594 return 1; 2595 } 2596 return 0; 2597} 2598 2599bool os::get_page_info(char *start, page_info* info) { 2600 return false; 2601} 2602 2603char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2604 return end; 2605} 2606 2607char* os::non_memory_address_word() { 2608 // Must never look like an address returned by reserve_memory, 2609 // even in its subfields (as defined by the CPU immediate fields, 2610 // if the CPU splits constants across multiple instructions). 2611 return (char*)-1; 2612} 2613 2614#define MAX_ERROR_COUNT 100 2615#define SYS_THREAD_ERROR 0xffffffffUL 2616 2617void os::pd_start_thread(Thread* thread) { 2618 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 2619 // Returns previous suspend state: 2620 // 0: Thread was not suspended 2621 // 1: Thread is running now 2622 // >1: Thread is still suspended. 2623 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 2624} 2625 2626size_t os::read(int fd, void *buf, unsigned int nBytes) { 2627 return ::read(fd, buf, nBytes); 2628} 2629 2630class HighResolutionInterval { 2631 // The default timer resolution seems to be 10 milliseconds. 2632 // (Where is this written down?) 2633 // If someone wants to sleep for only a fraction of the default, 2634 // then we set the timer resolution down to 1 millisecond for 2635 // the duration of their interval. 2636 // We carefully set the resolution back, since otherwise we 2637 // seem to incur an overhead (3%?) that we don't need. 2638 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 2639 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 2640 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 2641 // timeBeginPeriod() if the relative error exceeded some threshold. 2642 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 2643 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 2644 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 2645 // resolution timers running. 2646private: 2647 jlong resolution; 2648public: 2649 HighResolutionInterval(jlong ms) { 2650 resolution = ms % 10L; 2651 if (resolution != 0) { 2652 MMRESULT result = timeBeginPeriod(1L); 2653 } 2654 } 2655 ~HighResolutionInterval() { 2656 if (resolution != 0) { 2657 MMRESULT result = timeEndPeriod(1L); 2658 } 2659 resolution = 0L; 2660 } 2661}; 2662 2663int os::sleep(Thread* thread, jlong ms, bool interruptable) { 2664 jlong limit = (jlong) MAXDWORD; 2665 2666 while(ms > limit) { 2667 int res; 2668 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) 2669 return res; 2670 ms -= limit; 2671 } 2672 2673 assert(thread == Thread::current(), "thread consistency check"); 2674 OSThread* osthread = thread->osthread(); 2675 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 2676 int result; 2677 if (interruptable) { 2678 assert(thread->is_Java_thread(), "must be java thread"); 2679 JavaThread *jt = (JavaThread *) thread; 2680 ThreadBlockInVM tbivm(jt); 2681 2682 jt->set_suspend_equivalent(); 2683 // cleared by handle_special_suspend_equivalent_condition() or 2684 // java_suspend_self() via check_and_wait_while_suspended() 2685 2686 HANDLE events[1]; 2687 events[0] = osthread->interrupt_event(); 2688 HighResolutionInterval *phri=NULL; 2689 if(!ForceTimeHighResolution) 2690 phri = new HighResolutionInterval( ms ); 2691 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 2692 result = OS_TIMEOUT; 2693 } else { 2694 ResetEvent(osthread->interrupt_event()); 2695 osthread->set_interrupted(false); 2696 result = OS_INTRPT; 2697 } 2698 delete phri; //if it is NULL, harmless 2699 2700 // were we externally suspended while we were waiting? 2701 jt->check_and_wait_while_suspended(); 2702 } else { 2703 assert(!thread->is_Java_thread(), "must not be java thread"); 2704 Sleep((long) ms); 2705 result = OS_TIMEOUT; 2706 } 2707 return result; 2708} 2709 2710// Sleep forever; naked call to OS-specific sleep; use with CAUTION 2711void os::infinite_sleep() { 2712 while (true) { // sleep forever ... 2713 Sleep(100000); // ... 100 seconds at a time 2714 } 2715} 2716 2717typedef BOOL (WINAPI * STTSignature)(void) ; 2718 2719os::YieldResult os::NakedYield() { 2720 // Use either SwitchToThread() or Sleep(0) 2721 // Consider passing back the return value from SwitchToThread(). 2722 // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread. 2723 // In that case we revert to Sleep(0). 2724 static volatile STTSignature stt = (STTSignature) 1 ; 2725 2726 if (stt == ((STTSignature) 1)) { 2727 stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ; 2728 // It's OK if threads race during initialization as the operation above is idempotent. 2729 } 2730 if (stt != NULL) { 2731 return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ; 2732 } else { 2733 Sleep (0) ; 2734 } 2735 return os::YIELD_UNKNOWN ; 2736} 2737 2738void os::yield() { os::NakedYield(); } 2739 2740void os::yield_all(int attempts) { 2741 // Yields to all threads, including threads with lower priorities 2742 Sleep(1); 2743} 2744 2745// Win32 only gives you access to seven real priorities at a time, 2746// so we compress Java's ten down to seven. It would be better 2747// if we dynamically adjusted relative priorities. 2748 2749int os::java_to_os_priority[MaxPriority + 1] = { 2750 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 2751 THREAD_PRIORITY_LOWEST, // 1 MinPriority 2752 THREAD_PRIORITY_LOWEST, // 2 2753 THREAD_PRIORITY_BELOW_NORMAL, // 3 2754 THREAD_PRIORITY_BELOW_NORMAL, // 4 2755 THREAD_PRIORITY_NORMAL, // 5 NormPriority 2756 THREAD_PRIORITY_NORMAL, // 6 2757 THREAD_PRIORITY_ABOVE_NORMAL, // 7 2758 THREAD_PRIORITY_ABOVE_NORMAL, // 8 2759 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 2760 THREAD_PRIORITY_HIGHEST // 10 MaxPriority 2761}; 2762 2763int prio_policy1[MaxPriority + 1] = { 2764 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 2765 THREAD_PRIORITY_LOWEST, // 1 MinPriority 2766 THREAD_PRIORITY_LOWEST, // 2 2767 THREAD_PRIORITY_BELOW_NORMAL, // 3 2768 THREAD_PRIORITY_BELOW_NORMAL, // 4 2769 THREAD_PRIORITY_NORMAL, // 5 NormPriority 2770 THREAD_PRIORITY_ABOVE_NORMAL, // 6 2771 THREAD_PRIORITY_ABOVE_NORMAL, // 7 2772 THREAD_PRIORITY_HIGHEST, // 8 2773 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 2774 THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority 2775}; 2776 2777static int prio_init() { 2778 // If ThreadPriorityPolicy is 1, switch tables 2779 if (ThreadPriorityPolicy == 1) { 2780 int i; 2781 for (i = 0; i < MaxPriority + 1; i++) { 2782 os::java_to_os_priority[i] = prio_policy1[i]; 2783 } 2784 } 2785 return 0; 2786} 2787 2788OSReturn os::set_native_priority(Thread* thread, int priority) { 2789 if (!UseThreadPriorities) return OS_OK; 2790 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 2791 return ret ? OS_OK : OS_ERR; 2792} 2793 2794OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) { 2795 if ( !UseThreadPriorities ) { 2796 *priority_ptr = java_to_os_priority[NormPriority]; 2797 return OS_OK; 2798 } 2799 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 2800 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 2801 assert(false, "GetThreadPriority failed"); 2802 return OS_ERR; 2803 } 2804 *priority_ptr = os_prio; 2805 return OS_OK; 2806} 2807 2808 2809// Hint to the underlying OS that a task switch would not be good. 2810// Void return because it's a hint and can fail. 2811void os::hint_no_preempt() {} 2812 2813void os::interrupt(Thread* thread) { 2814 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 2815 "possibility of dangling Thread pointer"); 2816 2817 OSThread* osthread = thread->osthread(); 2818 osthread->set_interrupted(true); 2819 // More than one thread can get here with the same value of osthread, 2820 // resulting in multiple notifications. We do, however, want the store 2821 // to interrupted() to be visible to other threads before we post 2822 // the interrupt event. 2823 OrderAccess::release(); 2824 SetEvent(osthread->interrupt_event()); 2825 // For JSR166: unpark after setting status 2826 if (thread->is_Java_thread()) 2827 ((JavaThread*)thread)->parker()->unpark(); 2828 2829 ParkEvent * ev = thread->_ParkEvent ; 2830 if (ev != NULL) ev->unpark() ; 2831 2832} 2833 2834 2835bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 2836 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 2837 "possibility of dangling Thread pointer"); 2838 2839 OSThread* osthread = thread->osthread(); 2840 bool interrupted; 2841 interrupted = osthread->interrupted(); 2842 if (clear_interrupted == true) { 2843 osthread->set_interrupted(false); 2844 ResetEvent(osthread->interrupt_event()); 2845 } // Otherwise leave the interrupted state alone 2846 2847 return interrupted; 2848} 2849 2850// Get's a pc (hint) for a running thread. Currently used only for profiling. 2851ExtendedPC os::get_thread_pc(Thread* thread) { 2852 CONTEXT context; 2853 context.ContextFlags = CONTEXT_CONTROL; 2854 HANDLE handle = thread->osthread()->thread_handle(); 2855#ifdef _M_IA64 2856 assert(0, "Fix get_thread_pc"); 2857 return ExtendedPC(NULL); 2858#else 2859 if (GetThreadContext(handle, &context)) { 2860#ifdef _M_AMD64 2861 return ExtendedPC((address) context.Rip); 2862#else 2863 return ExtendedPC((address) context.Eip); 2864#endif 2865 } else { 2866 return ExtendedPC(NULL); 2867 } 2868#endif 2869} 2870 2871// GetCurrentThreadId() returns DWORD 2872intx os::current_thread_id() { return GetCurrentThreadId(); } 2873 2874static int _initial_pid = 0; 2875 2876int os::current_process_id() 2877{ 2878 return (_initial_pid ? _initial_pid : _getpid()); 2879} 2880 2881int os::win32::_vm_page_size = 0; 2882int os::win32::_vm_allocation_granularity = 0; 2883int os::win32::_processor_type = 0; 2884// Processor level is not available on non-NT systems, use vm_version instead 2885int os::win32::_processor_level = 0; 2886julong os::win32::_physical_memory = 0; 2887size_t os::win32::_default_stack_size = 0; 2888 2889 intx os::win32::_os_thread_limit = 0; 2890volatile intx os::win32::_os_thread_count = 0; 2891 2892bool os::win32::_is_nt = false; 2893 2894 2895void os::win32::initialize_system_info() { 2896 SYSTEM_INFO si; 2897 GetSystemInfo(&si); 2898 _vm_page_size = si.dwPageSize; 2899 _vm_allocation_granularity = si.dwAllocationGranularity; 2900 _processor_type = si.dwProcessorType; 2901 _processor_level = si.wProcessorLevel; 2902 _processor_count = si.dwNumberOfProcessors; 2903 2904 MEMORYSTATUS ms; 2905 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 2906 // dwMemoryLoad (% of memory in use) 2907 GlobalMemoryStatus(&ms); 2908 _physical_memory = ms.dwTotalPhys; 2909 2910 OSVERSIONINFO oi; 2911 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); 2912 GetVersionEx(&oi); 2913 switch(oi.dwPlatformId) { 2914 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 2915 case VER_PLATFORM_WIN32_NT: _is_nt = true; break; 2916 default: fatal("Unknown platform"); 2917 } 2918 2919 _default_stack_size = os::current_stack_size(); 2920 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 2921 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 2922 "stack size not a multiple of page size"); 2923 2924 initialize_performance_counter(); 2925 2926 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is 2927 // known to deadlock the system, if the VM issues to thread operations with 2928 // a too high frequency, e.g., such as changing the priorities. 2929 // The 6000 seems to work well - no deadlocks has been notices on the test 2930 // programs that we have seen experience this problem. 2931 if (!os::win32::is_nt()) { 2932 StarvationMonitorInterval = 6000; 2933 } 2934} 2935 2936 2937void os::win32::setmode_streams() { 2938 _setmode(_fileno(stdin), _O_BINARY); 2939 _setmode(_fileno(stdout), _O_BINARY); 2940 _setmode(_fileno(stderr), _O_BINARY); 2941} 2942 2943 2944int os::message_box(const char* title, const char* message) { 2945 int result = MessageBox(NULL, message, title, 2946 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 2947 return result == IDYES; 2948} 2949 2950int os::allocate_thread_local_storage() { 2951 return TlsAlloc(); 2952} 2953 2954 2955void os::free_thread_local_storage(int index) { 2956 TlsFree(index); 2957} 2958 2959 2960void os::thread_local_storage_at_put(int index, void* value) { 2961 TlsSetValue(index, value); 2962 assert(thread_local_storage_at(index) == value, "Just checking"); 2963} 2964 2965 2966void* os::thread_local_storage_at(int index) { 2967 return TlsGetValue(index); 2968} 2969 2970 2971#ifndef PRODUCT 2972#ifndef _WIN64 2973// Helpers to check whether NX protection is enabled 2974int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 2975 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 2976 pex->ExceptionRecord->NumberParameters > 0 && 2977 pex->ExceptionRecord->ExceptionInformation[0] == 2978 EXCEPTION_INFO_EXEC_VIOLATION) { 2979 return EXCEPTION_EXECUTE_HANDLER; 2980 } 2981 return EXCEPTION_CONTINUE_SEARCH; 2982} 2983 2984void nx_check_protection() { 2985 // If NX is enabled we'll get an exception calling into code on the stack 2986 char code[] = { (char)0xC3 }; // ret 2987 void *code_ptr = (void *)code; 2988 __try { 2989 __asm call code_ptr 2990 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 2991 tty->print_raw_cr("NX protection detected."); 2992 } 2993} 2994#endif // _WIN64 2995#endif // PRODUCT 2996 2997// this is called _before_ the global arguments have been parsed 2998void os::init(void) { 2999 _initial_pid = _getpid(); 3000 3001 init_random(1234567); 3002 3003 win32::initialize_system_info(); 3004 win32::setmode_streams(); 3005 init_page_sizes((size_t) win32::vm_page_size()); 3006 3007 // For better scalability on MP systems (must be called after initialize_system_info) 3008#ifndef PRODUCT 3009 if (is_MP()) { 3010 NoYieldsInMicrolock = true; 3011 } 3012#endif 3013 // Initialize main_process and main_thread 3014 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 3015 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 3016 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 3017 fatal("DuplicateHandle failed\n"); 3018 } 3019 main_thread_id = (int) GetCurrentThreadId(); 3020} 3021 3022// To install functions for atexit processing 3023extern "C" { 3024 static void perfMemory_exit_helper() { 3025 perfMemory_exit(); 3026 } 3027} 3028 3029 3030// this is called _after_ the global arguments have been parsed 3031jint os::init_2(void) { 3032 // Allocate a single page and mark it as readable for safepoint polling 3033 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 3034 guarantee( polling_page != NULL, "Reserve Failed for polling page"); 3035 3036 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 3037 guarantee( return_page != NULL, "Commit Failed for polling page"); 3038 3039 os::set_polling_page( polling_page ); 3040 3041#ifndef PRODUCT 3042 if( Verbose && PrintMiscellaneous ) 3043 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 3044#endif 3045 3046 if (!UseMembar) { 3047 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_EXECUTE_READWRITE); 3048 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 3049 3050 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_EXECUTE_READWRITE); 3051 guarantee( return_page != NULL, "Commit Failed for memory serialize page"); 3052 3053 os::set_memory_serialize_page( mem_serialize_page ); 3054 3055#ifndef PRODUCT 3056 if(Verbose && PrintMiscellaneous) 3057 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3058#endif 3059} 3060 3061 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init()); 3062 3063 // Setup Windows Exceptions 3064 3065 // On Itanium systems, Structured Exception Handling does not 3066 // work since stack frames must be walkable by the OS. Since 3067 // much of our code is dynamically generated, and we do not have 3068 // proper unwind .xdata sections, the system simply exits 3069 // rather than delivering the exception. To work around 3070 // this we use VectorExceptions instead. 3071#ifdef _WIN64 3072 if (UseVectoredExceptions) { 3073 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter); 3074 } 3075#endif 3076 3077 // for debugging float code generation bugs 3078 if (ForceFloatExceptions) { 3079#ifndef _WIN64 3080 static long fp_control_word = 0; 3081 __asm { fstcw fp_control_word } 3082 // see Intel PPro Manual, Vol. 2, p 7-16 3083 const long precision = 0x20; 3084 const long underflow = 0x10; 3085 const long overflow = 0x08; 3086 const long zero_div = 0x04; 3087 const long denorm = 0x02; 3088 const long invalid = 0x01; 3089 fp_control_word |= invalid; 3090 __asm { fldcw fp_control_word } 3091#endif 3092 } 3093 3094 // Initialize HPI. 3095 jint hpi_result = hpi::initialize(); 3096 if (hpi_result != JNI_OK) { return hpi_result; } 3097 3098 // If stack_commit_size is 0, windows will reserve the default size, 3099 // but only commit a small portion of it. 3100 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 3101 size_t default_reserve_size = os::win32::default_stack_size(); 3102 size_t actual_reserve_size = stack_commit_size; 3103 if (stack_commit_size < default_reserve_size) { 3104 // If stack_commit_size == 0, we want this too 3105 actual_reserve_size = default_reserve_size; 3106 } 3107 3108 JavaThread::set_stack_size_at_create(stack_commit_size); 3109 3110 // Calculate theoretical max. size of Threads to guard gainst artifical 3111 // out-of-memory situations, where all available address-space has been 3112 // reserved by thread stacks. 3113 assert(actual_reserve_size != 0, "Must have a stack"); 3114 3115 // Calculate the thread limit when we should start doing Virtual Memory 3116 // banging. Currently when the threads will have used all but 200Mb of space. 3117 // 3118 // TODO: consider performing a similar calculation for commit size instead 3119 // as reserve size, since on a 64-bit platform we'll run into that more 3120 // often than running out of virtual memory space. We can use the 3121 // lower value of the two calculations as the os_thread_limit. 3122 size_t max_address_space = ((size_t)1 << (BitsPerOop - 1)) - (200 * K * K); 3123 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 3124 3125 // at exit methods are called in the reverse order of their registration. 3126 // there is no limit to the number of functions registered. atexit does 3127 // not set errno. 3128 3129 if (PerfAllowAtExitRegistration) { 3130 // only register atexit functions if PerfAllowAtExitRegistration is set. 3131 // atexit functions can be delayed until process exit time, which 3132 // can be problematic for embedded VM situations. Embedded VMs should 3133 // call DestroyJavaVM() to assure that VM resources are released. 3134 3135 // note: perfMemory_exit_helper atexit function may be removed in 3136 // the future if the appropriate cleanup code can be added to the 3137 // VM_Exit VMOperation's doit method. 3138 if (atexit(perfMemory_exit_helper) != 0) { 3139 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3140 } 3141 } 3142 3143 // initialize PSAPI or ToolHelp for fatal error handler 3144 if (win32::is_nt()) _init_psapi(); 3145 else _init_toolhelp(); 3146 3147#ifndef _WIN64 3148 // Print something if NX is enabled (win32 on AMD64) 3149 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 3150#endif 3151 3152 // initialize thread priority policy 3153 prio_init(); 3154 3155 return JNI_OK; 3156} 3157 3158 3159// Mark the polling page as unreadable 3160void os::make_polling_page_unreadable(void) { 3161 DWORD old_status; 3162 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) ) 3163 fatal("Could not disable polling page"); 3164}; 3165 3166// Mark the polling page as readable 3167void os::make_polling_page_readable(void) { 3168 DWORD old_status; 3169 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) ) 3170 fatal("Could not enable polling page"); 3171}; 3172 3173 3174int os::stat(const char *path, struct stat *sbuf) { 3175 char pathbuf[MAX_PATH]; 3176 if (strlen(path) > MAX_PATH - 1) { 3177 errno = ENAMETOOLONG; 3178 return -1; 3179 } 3180 hpi::native_path(strcpy(pathbuf, path)); 3181 int ret = ::stat(pathbuf, sbuf); 3182 if (sbuf != NULL && UseUTCFileTimestamp) { 3183 // Fix for 6539723. st_mtime returned from stat() is dependent on 3184 // the system timezone and so can return different values for the 3185 // same file if/when daylight savings time changes. This adjustment 3186 // makes sure the same timestamp is returned regardless of the TZ. 3187 // 3188 // See: 3189 // http://msdn.microsoft.com/library/ 3190 // default.asp?url=/library/en-us/sysinfo/base/ 3191 // time_zone_information_str.asp 3192 // and 3193 // http://msdn.microsoft.com/library/default.asp?url= 3194 // /library/en-us/sysinfo/base/settimezoneinformation.asp 3195 // 3196 // NOTE: there is a insidious bug here: If the timezone is changed 3197 // after the call to stat() but before 'GetTimeZoneInformation()', then 3198 // the adjustment we do here will be wrong and we'll return the wrong 3199 // value (which will likely end up creating an invalid class data 3200 // archive). Absent a better API for this, or some time zone locking 3201 // mechanism, we'll have to live with this risk. 3202 TIME_ZONE_INFORMATION tz; 3203 DWORD tzid = GetTimeZoneInformation(&tz); 3204 int daylightBias = 3205 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 3206 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 3207 } 3208 return ret; 3209} 3210 3211 3212#define FT2INT64(ft) \ 3213 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 3214 3215 3216// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3217// are used by JVM M&M and JVMTI to get user+sys or user CPU time 3218// of a thread. 3219// 3220// current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3221// the fast estimate available on the platform. 3222 3223// current_thread_cpu_time() is not optimized for Windows yet 3224jlong os::current_thread_cpu_time() { 3225 // return user + sys since the cost is the same 3226 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 3227} 3228 3229jlong os::thread_cpu_time(Thread* thread) { 3230 // consistent with what current_thread_cpu_time() returns. 3231 return os::thread_cpu_time(thread, true /* user+sys */); 3232} 3233 3234jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3235 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3236} 3237 3238jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 3239 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 3240 // If this function changes, os::is_thread_cpu_time_supported() should too 3241 if (os::win32::is_nt()) { 3242 FILETIME CreationTime; 3243 FILETIME ExitTime; 3244 FILETIME KernelTime; 3245 FILETIME UserTime; 3246 3247 if ( GetThreadTimes(thread->osthread()->thread_handle(), 3248 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 3249 return -1; 3250 else 3251 if (user_sys_cpu_time) { 3252 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 3253 } else { 3254 return FT2INT64(UserTime) * 100; 3255 } 3256 } else { 3257 return (jlong) timeGetTime() * 1000000; 3258 } 3259} 3260 3261void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3262 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 3263 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 3264 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 3265 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3266} 3267 3268void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3269 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 3270 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 3271 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 3272 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3273} 3274 3275bool os::is_thread_cpu_time_supported() { 3276 // see os::thread_cpu_time 3277 if (os::win32::is_nt()) { 3278 FILETIME CreationTime; 3279 FILETIME ExitTime; 3280 FILETIME KernelTime; 3281 FILETIME UserTime; 3282 3283 if ( GetThreadTimes(GetCurrentThread(), 3284 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 3285 return false; 3286 else 3287 return true; 3288 } else { 3289 return false; 3290 } 3291} 3292 3293// Windows does't provide a loadavg primitive so this is stubbed out for now. 3294// It does have primitives (PDH API) to get CPU usage and run queue length. 3295// "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 3296// If we wanted to implement loadavg on Windows, we have a few options: 3297// 3298// a) Query CPU usage and run queue length and "fake" an answer by 3299// returning the CPU usage if it's under 100%, and the run queue 3300// length otherwise. It turns out that querying is pretty slow 3301// on Windows, on the order of 200 microseconds on a fast machine. 3302// Note that on the Windows the CPU usage value is the % usage 3303// since the last time the API was called (and the first call 3304// returns 100%), so we'd have to deal with that as well. 3305// 3306// b) Sample the "fake" answer using a sampling thread and store 3307// the answer in a global variable. The call to loadavg would 3308// just return the value of the global, avoiding the slow query. 3309// 3310// c) Sample a better answer using exponential decay to smooth the 3311// value. This is basically the algorithm used by UNIX kernels. 3312// 3313// Note that sampling thread starvation could affect both (b) and (c). 3314int os::loadavg(double loadavg[], int nelem) { 3315 return -1; 3316} 3317 3318 3319// DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 3320bool os::dont_yield() { 3321 return DontYieldALot; 3322} 3323 3324// Is a (classpath) directory empty? 3325bool os::dir_is_empty(const char* path) { 3326 WIN32_FIND_DATA fd; 3327 HANDLE f = FindFirstFile(path, &fd); 3328 if (f == INVALID_HANDLE_VALUE) { 3329 return true; 3330 } 3331 FindClose(f); 3332 return false; 3333} 3334 3335// create binary file, rewriting existing file if required 3336int os::create_binary_file(const char* path, bool rewrite_existing) { 3337 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 3338 if (!rewrite_existing) { 3339 oflags |= _O_EXCL; 3340 } 3341 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 3342} 3343 3344// return current position of file pointer 3345jlong os::current_file_offset(int fd) { 3346 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 3347} 3348 3349// move file pointer to the specified offset 3350jlong os::seek_to_file_offset(int fd, jlong offset) { 3351 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 3352} 3353 3354 3355// Map a block of memory. 3356char* os::map_memory(int fd, const char* file_name, size_t file_offset, 3357 char *addr, size_t bytes, bool read_only, 3358 bool allow_exec) { 3359 HANDLE hFile; 3360 char* base; 3361 3362 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 3363 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 3364 if (hFile == NULL) { 3365 if (PrintMiscellaneous && Verbose) { 3366 DWORD err = GetLastError(); 3367 tty->print_cr("CreateFile() failed: GetLastError->%ld."); 3368 } 3369 return NULL; 3370 } 3371 3372 if (allow_exec) { 3373 // CreateFileMapping/MapViewOfFileEx can't map executable memory 3374 // unless it comes from a PE image (which the shared archive is not.) 3375 // Even VirtualProtect refuses to give execute access to mapped memory 3376 // that was not previously executable. 3377 // 3378 // Instead, stick the executable region in anonymous memory. Yuck. 3379 // Penalty is that ~4 pages will not be shareable - in the future 3380 // we might consider DLLizing the shared archive with a proper PE 3381 // header so that mapping executable + sharing is possible. 3382 3383 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 3384 PAGE_READWRITE); 3385 if (base == NULL) { 3386 if (PrintMiscellaneous && Verbose) { 3387 DWORD err = GetLastError(); 3388 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 3389 } 3390 CloseHandle(hFile); 3391 return NULL; 3392 } 3393 3394 DWORD bytes_read; 3395 OVERLAPPED overlapped; 3396 overlapped.Offset = (DWORD)file_offset; 3397 overlapped.OffsetHigh = 0; 3398 overlapped.hEvent = NULL; 3399 // ReadFile guarantees that if the return value is true, the requested 3400 // number of bytes were read before returning. 3401 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 3402 if (!res) { 3403 if (PrintMiscellaneous && Verbose) { 3404 DWORD err = GetLastError(); 3405 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 3406 } 3407 release_memory(base, bytes); 3408 CloseHandle(hFile); 3409 return NULL; 3410 } 3411 } else { 3412 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 3413 NULL /*file_name*/); 3414 if (hMap == NULL) { 3415 if (PrintMiscellaneous && Verbose) { 3416 DWORD err = GetLastError(); 3417 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld."); 3418 } 3419 CloseHandle(hFile); 3420 return NULL; 3421 } 3422 3423 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 3424 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 3425 (DWORD)bytes, addr); 3426 if (base == NULL) { 3427 if (PrintMiscellaneous && Verbose) { 3428 DWORD err = GetLastError(); 3429 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 3430 } 3431 CloseHandle(hMap); 3432 CloseHandle(hFile); 3433 return NULL; 3434 } 3435 3436 if (CloseHandle(hMap) == 0) { 3437 if (PrintMiscellaneous && Verbose) { 3438 DWORD err = GetLastError(); 3439 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 3440 } 3441 CloseHandle(hFile); 3442 return base; 3443 } 3444 } 3445 3446 if (allow_exec) { 3447 DWORD old_protect; 3448 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 3449 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 3450 3451 if (!res) { 3452 if (PrintMiscellaneous && Verbose) { 3453 DWORD err = GetLastError(); 3454 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 3455 } 3456 // Don't consider this a hard error, on IA32 even if the 3457 // VirtualProtect fails, we should still be able to execute 3458 CloseHandle(hFile); 3459 return base; 3460 } 3461 } 3462 3463 if (CloseHandle(hFile) == 0) { 3464 if (PrintMiscellaneous && Verbose) { 3465 DWORD err = GetLastError(); 3466 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 3467 } 3468 return base; 3469 } 3470 3471 return base; 3472} 3473 3474 3475// Remap a block of memory. 3476char* os::remap_memory(int fd, const char* file_name, size_t file_offset, 3477 char *addr, size_t bytes, bool read_only, 3478 bool allow_exec) { 3479 // This OS does not allow existing memory maps to be remapped so we 3480 // have to unmap the memory before we remap it. 3481 if (!os::unmap_memory(addr, bytes)) { 3482 return NULL; 3483 } 3484 3485 // There is a very small theoretical window between the unmap_memory() 3486 // call above and the map_memory() call below where a thread in native 3487 // code may be able to access an address that is no longer mapped. 3488 3489 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3490 allow_exec); 3491} 3492 3493 3494// Unmap a block of memory. 3495// Returns true=success, otherwise false. 3496 3497bool os::unmap_memory(char* addr, size_t bytes) { 3498 BOOL result = UnmapViewOfFile(addr); 3499 if (result == 0) { 3500 if (PrintMiscellaneous && Verbose) { 3501 DWORD err = GetLastError(); 3502 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 3503 } 3504 return false; 3505 } 3506 return true; 3507} 3508 3509void os::pause() { 3510 char filename[MAX_PATH]; 3511 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 3512 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 3513 } else { 3514 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 3515 } 3516 3517 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 3518 if (fd != -1) { 3519 struct stat buf; 3520 close(fd); 3521 while (::stat(filename, &buf) == 0) { 3522 Sleep(100); 3523 } 3524 } else { 3525 jio_fprintf(stderr, 3526 "Could not open pause file '%s', continuing immediately.\n", filename); 3527 } 3528} 3529 3530// An Event wraps a win32 "CreateEvent" kernel handle. 3531// 3532// We have a number of choices regarding "CreateEvent" win32 handle leakage: 3533// 3534// 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 3535// field, and call CloseHandle() on the win32 event handle. Unpark() would 3536// need to be modified to tolerate finding a NULL (invalid) win32 event handle. 3537// In addition, an unpark() operation might fetch the handle field, but the 3538// event could recycle between the fetch and the SetEvent() operation. 3539// SetEvent() would either fail because the handle was invalid, or inadvertently work, 3540// as the win32 handle value had been recycled. In an ideal world calling SetEvent() 3541// on an stale but recycled handle would be harmless, but in practice this might 3542// confuse other non-Sun code, so it's not a viable approach. 3543// 3544// 2: Once a win32 event handle is associated with an Event, it remains associated 3545// with the Event. The event handle is never closed. This could be construed 3546// as handle leakage, but only up to the maximum # of threads that have been extant 3547// at any one time. This shouldn't be an issue, as windows platforms typically 3548// permit a process to have hundreds of thousands of open handles. 3549// 3550// 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 3551// and release unused handles. 3552// 3553// 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 3554// It's not clear, however, that we wouldn't be trading one type of leak for another. 3555// 3556// 5. Use an RCU-like mechanism (Read-Copy Update). 3557// Or perhaps something similar to Maged Michael's "Hazard pointers". 3558// 3559// We use (2). 3560// 3561// TODO-FIXME: 3562// 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 3563// 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 3564// to recover from (or at least detect) the dreaded Windows 841176 bug. 3565// 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 3566// into a single win32 CreateEvent() handle. 3567// 3568// _Event transitions in park() 3569// -1 => -1 : illegal 3570// 1 => 0 : pass - return immediately 3571// 0 => -1 : block 3572// 3573// _Event serves as a restricted-range semaphore : 3574// -1 : thread is blocked 3575// 0 : neutral - thread is running or ready 3576// 1 : signaled - thread is running or ready 3577// 3578// Another possible encoding of _Event would be 3579// with explicit "PARKED" and "SIGNALED" bits. 3580 3581int os::PlatformEvent::park (jlong Millis) { 3582 guarantee (_ParkHandle != NULL , "Invariant") ; 3583 guarantee (Millis > 0 , "Invariant") ; 3584 int v ; 3585 3586 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 3587 // the initial park() operation. 3588 3589 for (;;) { 3590 v = _Event ; 3591 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 3592 } 3593 guarantee ((v == 0) || (v == 1), "invariant") ; 3594 if (v != 0) return OS_OK ; 3595 3596 // Do this the hard way by blocking ... 3597 // TODO: consider a brief spin here, gated on the success of recent 3598 // spin attempts by this thread. 3599 // 3600 // We decompose long timeouts into series of shorter timed waits. 3601 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 3602 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 3603 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 3604 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 3605 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 3606 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 3607 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 3608 // for the already waited time. This policy does not admit any new outcomes. 3609 // In the future, however, we might want to track the accumulated wait time and 3610 // adjust Millis accordingly if we encounter a spurious wakeup. 3611 3612 const int MAXTIMEOUT = 0x10000000 ; 3613 DWORD rv = WAIT_TIMEOUT ; 3614 while (_Event < 0 && Millis > 0) { 3615 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT) 3616 if (Millis > MAXTIMEOUT) { 3617 prd = MAXTIMEOUT ; 3618 } 3619 rv = ::WaitForSingleObject (_ParkHandle, prd) ; 3620 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ; 3621 if (rv == WAIT_TIMEOUT) { 3622 Millis -= prd ; 3623 } 3624 } 3625 v = _Event ; 3626 _Event = 0 ; 3627 OrderAccess::fence() ; 3628 // If we encounter a nearly simultanous timeout expiry and unpark() 3629 // we return OS_OK indicating we awoke via unpark(). 3630 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 3631 return (v >= 0) ? OS_OK : OS_TIMEOUT ; 3632} 3633 3634void os::PlatformEvent::park () { 3635 guarantee (_ParkHandle != NULL, "Invariant") ; 3636 // Invariant: Only the thread associated with the Event/PlatformEvent 3637 // may call park(). 3638 int v ; 3639 for (;;) { 3640 v = _Event ; 3641 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 3642 } 3643 guarantee ((v == 0) || (v == 1), "invariant") ; 3644 if (v != 0) return ; 3645 3646 // Do this the hard way by blocking ... 3647 // TODO: consider a brief spin here, gated on the success of recent 3648 // spin attempts by this thread. 3649 while (_Event < 0) { 3650 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ; 3651 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ; 3652 } 3653 3654 // Usually we'll find _Event == 0 at this point, but as 3655 // an optional optimization we clear it, just in case can 3656 // multiple unpark() operations drove _Event up to 1. 3657 _Event = 0 ; 3658 OrderAccess::fence() ; 3659 guarantee (_Event >= 0, "invariant") ; 3660} 3661 3662void os::PlatformEvent::unpark() { 3663 guarantee (_ParkHandle != NULL, "Invariant") ; 3664 int v ; 3665 for (;;) { 3666 v = _Event ; // Increment _Event if it's < 1. 3667 if (v > 0) { 3668 // If it's already signaled just return. 3669 // The LD of _Event could have reordered or be satisfied 3670 // by a read-aside from this processor's write buffer. 3671 // To avoid problems execute a barrier and then 3672 // ratify the value. A degenerate CAS() would also work. 3673 // Viz., CAS (v+0, &_Event, v) == v). 3674 OrderAccess::fence() ; 3675 if (_Event == v) return ; 3676 continue ; 3677 } 3678 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; 3679 } 3680 if (v < 0) { 3681 ::SetEvent (_ParkHandle) ; 3682 } 3683} 3684 3685 3686// JSR166 3687// ------------------------------------------------------- 3688 3689/* 3690 * The Windows implementation of Park is very straightforward: Basic 3691 * operations on Win32 Events turn out to have the right semantics to 3692 * use them directly. We opportunistically resuse the event inherited 3693 * from Monitor. 3694 */ 3695 3696 3697void Parker::park(bool isAbsolute, jlong time) { 3698 guarantee (_ParkEvent != NULL, "invariant") ; 3699 // First, demultiplex/decode time arguments 3700 if (time < 0) { // don't wait 3701 return; 3702 } 3703 else if (time == 0) { 3704 time = INFINITE; 3705 } 3706 else if (isAbsolute) { 3707 time -= os::javaTimeMillis(); // convert to relative time 3708 if (time <= 0) // already elapsed 3709 return; 3710 } 3711 else { // relative 3712 time /= 1000000; // Must coarsen from nanos to millis 3713 if (time == 0) // Wait for the minimal time unit if zero 3714 time = 1; 3715 } 3716 3717 JavaThread* thread = (JavaThread*)(Thread::current()); 3718 assert(thread->is_Java_thread(), "Must be JavaThread"); 3719 JavaThread *jt = (JavaThread *)thread; 3720 3721 // Don't wait if interrupted or already triggered 3722 if (Thread::is_interrupted(thread, false) || 3723 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 3724 ResetEvent(_ParkEvent); 3725 return; 3726 } 3727 else { 3728 ThreadBlockInVM tbivm(jt); 3729 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 3730 jt->set_suspend_equivalent(); 3731 3732 WaitForSingleObject(_ParkEvent, time); 3733 ResetEvent(_ParkEvent); 3734 3735 // If externally suspended while waiting, re-suspend 3736 if (jt->handle_special_suspend_equivalent_condition()) { 3737 jt->java_suspend_self(); 3738 } 3739 } 3740} 3741 3742void Parker::unpark() { 3743 guarantee (_ParkEvent != NULL, "invariant") ; 3744 SetEvent(_ParkEvent); 3745} 3746 3747// Run the specified command in a separate process. Return its exit value, 3748// or -1 on failure (e.g. can't create a new process). 3749int os::fork_and_exec(char* cmd) { 3750 STARTUPINFO si; 3751 PROCESS_INFORMATION pi; 3752 3753 memset(&si, 0, sizeof(si)); 3754 si.cb = sizeof(si); 3755 memset(&pi, 0, sizeof(pi)); 3756 BOOL rslt = CreateProcess(NULL, // executable name - use command line 3757 cmd, // command line 3758 NULL, // process security attribute 3759 NULL, // thread security attribute 3760 TRUE, // inherits system handles 3761 0, // no creation flags 3762 NULL, // use parent's environment block 3763 NULL, // use parent's starting directory 3764 &si, // (in) startup information 3765 &pi); // (out) process information 3766 3767 if (rslt) { 3768 // Wait until child process exits. 3769 WaitForSingleObject(pi.hProcess, INFINITE); 3770 3771 DWORD exit_code; 3772 GetExitCodeProcess(pi.hProcess, &exit_code); 3773 3774 // Close process and thread handles. 3775 CloseHandle(pi.hProcess); 3776 CloseHandle(pi.hThread); 3777 3778 return (int)exit_code; 3779 } else { 3780 return -1; 3781 } 3782} 3783 3784//-------------------------------------------------------------------------------------------------- 3785// Non-product code 3786 3787static int mallocDebugIntervalCounter = 0; 3788static int mallocDebugCounter = 0; 3789bool os::check_heap(bool force) { 3790 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 3791 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 3792 // Note: HeapValidate executes two hardware breakpoints when it finds something 3793 // wrong; at these points, eax contains the address of the offending block (I think). 3794 // To get to the exlicit error message(s) below, just continue twice. 3795 HANDLE heap = GetProcessHeap(); 3796 { HeapLock(heap); 3797 PROCESS_HEAP_ENTRY phe; 3798 phe.lpData = NULL; 3799 while (HeapWalk(heap, &phe) != 0) { 3800 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 3801 !HeapValidate(heap, 0, phe.lpData)) { 3802 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 3803 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 3804 fatal("corrupted C heap"); 3805 } 3806 } 3807 int err = GetLastError(); 3808 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 3809 fatal1("heap walk aborted with error %d", err); 3810 } 3811 HeapUnlock(heap); 3812 } 3813 mallocDebugIntervalCounter = 0; 3814 } 3815 return true; 3816} 3817 3818 3819#ifndef PRODUCT 3820bool os::find(address addr) { 3821 // Nothing yet 3822 return false; 3823} 3824#endif 3825 3826LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 3827 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 3828 3829 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { 3830 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow(); 3831 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 3832 address addr = (address) exceptionRecord->ExceptionInformation[1]; 3833 3834 if (os::is_memory_serialize_page(thread, addr)) 3835 return EXCEPTION_CONTINUE_EXECUTION; 3836 } 3837 3838 return EXCEPTION_CONTINUE_SEARCH; 3839} 3840 3841static int getLastErrorString(char *buf, size_t len) 3842{ 3843 long errval; 3844 3845 if ((errval = GetLastError()) != 0) 3846 { 3847 /* DOS error */ 3848 size_t n = (size_t)FormatMessage( 3849 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 3850 NULL, 3851 errval, 3852 0, 3853 buf, 3854 (DWORD)len, 3855 NULL); 3856 if (n > 3) { 3857 /* Drop final '.', CR, LF */ 3858 if (buf[n - 1] == '\n') n--; 3859 if (buf[n - 1] == '\r') n--; 3860 if (buf[n - 1] == '.') n--; 3861 buf[n] = '\0'; 3862 } 3863 return (int)n; 3864 } 3865 3866 if (errno != 0) 3867 { 3868 /* C runtime error that has no corresponding DOS error code */ 3869 const char *s = strerror(errno); 3870 size_t n = strlen(s); 3871 if (n >= len) n = len - 1; 3872 strncpy(buf, s, n); 3873 buf[n] = '\0'; 3874 return (int)n; 3875 } 3876 return 0; 3877} 3878