os_windows.cpp revision 467:8724fb00c422
1/* 2 * Copyright 1997-2008 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} 739 740// For now, we say that Windows does not support vtime. I have no idea 741// whether it can actually be made to (DLD, 9/13/05). 742 743bool os::supports_vtime() { return false; } 744bool os::enable_vtime() { return false; } 745bool os::vtime_enabled() { return false; } 746double os::elapsedVTime() { 747 // better than nothing, but not much 748 return elapsedTime(); 749} 750 751jlong os::javaTimeMillis() { 752 if (UseFakeTimers) { 753 return fake_time++; 754 } else { 755 FILETIME wt; 756 GetSystemTimeAsFileTime(&wt); 757 return windows_to_java_time(wt); 758 } 759} 760 761#define NANOS_PER_SEC CONST64(1000000000) 762#define NANOS_PER_MILLISEC 1000000 763jlong os::javaTimeNanos() { 764 if (!has_performance_count) { 765 return javaTimeMillis() * NANOS_PER_MILLISEC; // the best we can do. 766 } else { 767 LARGE_INTEGER current_count; 768 QueryPerformanceCounter(¤t_count); 769 double current = as_long(current_count); 770 double freq = performance_frequency; 771 jlong time = (jlong)((current/freq) * NANOS_PER_SEC); 772 return time; 773 } 774} 775 776void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 777 if (!has_performance_count) { 778 // javaTimeMillis() doesn't have much percision, 779 // but it is not going to wrap -- so all 64 bits 780 info_ptr->max_value = ALL_64_BITS; 781 782 // this is a wall clock timer, so may skip 783 info_ptr->may_skip_backward = true; 784 info_ptr->may_skip_forward = true; 785 } else { 786 jlong freq = performance_frequency; 787 if (freq < NANOS_PER_SEC) { 788 // the performance counter is 64 bits and we will 789 // be multiplying it -- so no wrap in 64 bits 790 info_ptr->max_value = ALL_64_BITS; 791 } else if (freq > NANOS_PER_SEC) { 792 // use the max value the counter can reach to 793 // determine the max value which could be returned 794 julong max_counter = (julong)ALL_64_BITS; 795 info_ptr->max_value = (jlong)(max_counter / (freq / NANOS_PER_SEC)); 796 } else { 797 // the performance counter is 64 bits and we will 798 // be using it directly -- so no wrap in 64 bits 799 info_ptr->max_value = ALL_64_BITS; 800 } 801 802 // using a counter, so no skipping 803 info_ptr->may_skip_backward = false; 804 info_ptr->may_skip_forward = false; 805 } 806 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 807} 808 809char* os::local_time_string(char *buf, size_t buflen) { 810 SYSTEMTIME st; 811 GetLocalTime(&st); 812 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 813 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 814 return buf; 815} 816 817bool os::getTimesSecs(double* process_real_time, 818 double* process_user_time, 819 double* process_system_time) { 820 HANDLE h_process = GetCurrentProcess(); 821 FILETIME create_time, exit_time, kernel_time, user_time; 822 BOOL result = GetProcessTimes(h_process, 823 &create_time, 824 &exit_time, 825 &kernel_time, 826 &user_time); 827 if (result != 0) { 828 FILETIME wt; 829 GetSystemTimeAsFileTime(&wt); 830 jlong rtc_millis = windows_to_java_time(wt); 831 jlong user_millis = windows_to_java_time(user_time); 832 jlong system_millis = windows_to_java_time(kernel_time); 833 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 834 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); 835 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); 836 return true; 837 } else { 838 return false; 839 } 840} 841 842void os::shutdown() { 843 844 // allow PerfMemory to attempt cleanup of any persistent resources 845 perfMemory_exit(); 846 847 // flush buffered output, finish log files 848 ostream_abort(); 849 850 // Check for abort hook 851 abort_hook_t abort_hook = Arguments::abort_hook(); 852 if (abort_hook != NULL) { 853 abort_hook(); 854 } 855} 856 857void os::abort(bool dump_core) 858{ 859 os::shutdown(); 860 // no core dump on Windows 861 ::exit(1); 862} 863 864// Die immediately, no exit hook, no abort hook, no cleanup. 865void os::die() { 866 _exit(-1); 867} 868 869// Directory routines copied from src/win32/native/java/io/dirent_md.c 870// * dirent_md.c 1.15 00/02/02 871// 872// The declarations for DIR and struct dirent are in jvm_win32.h. 873 874/* Caller must have already run dirname through JVM_NativePath, which removes 875 duplicate slashes and converts all instances of '/' into '\\'. */ 876 877DIR * 878os::opendir(const char *dirname) 879{ 880 assert(dirname != NULL, "just checking"); // hotspot change 881 DIR *dirp = (DIR *)malloc(sizeof(DIR)); 882 DWORD fattr; // hotspot change 883 char alt_dirname[4] = { 0, 0, 0, 0 }; 884 885 if (dirp == 0) { 886 errno = ENOMEM; 887 return 0; 888 } 889 890 /* 891 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it 892 * as a directory in FindFirstFile(). We detect this case here and 893 * prepend the current drive name. 894 */ 895 if (dirname[1] == '\0' && dirname[0] == '\\') { 896 alt_dirname[0] = _getdrive() + 'A' - 1; 897 alt_dirname[1] = ':'; 898 alt_dirname[2] = '\\'; 899 alt_dirname[3] = '\0'; 900 dirname = alt_dirname; 901 } 902 903 dirp->path = (char *)malloc(strlen(dirname) + 5); 904 if (dirp->path == 0) { 905 free(dirp); 906 errno = ENOMEM; 907 return 0; 908 } 909 strcpy(dirp->path, dirname); 910 911 fattr = GetFileAttributes(dirp->path); 912 if (fattr == 0xffffffff) { 913 free(dirp->path); 914 free(dirp); 915 errno = ENOENT; 916 return 0; 917 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 918 free(dirp->path); 919 free(dirp); 920 errno = ENOTDIR; 921 return 0; 922 } 923 924 /* Append "*.*", or possibly "\\*.*", to path */ 925 if (dirp->path[1] == ':' 926 && (dirp->path[2] == '\0' 927 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 928 /* No '\\' needed for cases like "Z:" or "Z:\" */ 929 strcat(dirp->path, "*.*"); 930 } else { 931 strcat(dirp->path, "\\*.*"); 932 } 933 934 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 935 if (dirp->handle == INVALID_HANDLE_VALUE) { 936 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 937 free(dirp->path); 938 free(dirp); 939 errno = EACCES; 940 return 0; 941 } 942 } 943 return dirp; 944} 945 946/* parameter dbuf unused on Windows */ 947 948struct dirent * 949os::readdir(DIR *dirp, dirent *dbuf) 950{ 951 assert(dirp != NULL, "just checking"); // hotspot change 952 if (dirp->handle == INVALID_HANDLE_VALUE) { 953 return 0; 954 } 955 956 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 957 958 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 959 if (GetLastError() == ERROR_INVALID_HANDLE) { 960 errno = EBADF; 961 return 0; 962 } 963 FindClose(dirp->handle); 964 dirp->handle = INVALID_HANDLE_VALUE; 965 } 966 967 return &dirp->dirent; 968} 969 970int 971os::closedir(DIR *dirp) 972{ 973 assert(dirp != NULL, "just checking"); // hotspot change 974 if (dirp->handle != INVALID_HANDLE_VALUE) { 975 if (!FindClose(dirp->handle)) { 976 errno = EBADF; 977 return -1; 978 } 979 dirp->handle = INVALID_HANDLE_VALUE; 980 } 981 free(dirp->path); 982 free(dirp); 983 return 0; 984} 985 986const char* os::dll_file_extension() { return ".dll"; } 987 988const char * os::get_temp_directory() 989{ 990 static char path_buf[MAX_PATH]; 991 if (GetTempPath(MAX_PATH, path_buf)>0) 992 return path_buf; 993 else{ 994 path_buf[0]='\0'; 995 return path_buf; 996 } 997} 998 999void os::dll_build_name(char *holder, size_t holderlen, 1000 const char* pname, const char* fname) 1001{ 1002 // copied from libhpi 1003 const size_t pnamelen = pname ? strlen(pname) : 0; 1004 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0; 1005 1006 /* Quietly truncates on buffer overflow. Should be an error. */ 1007 if (pnamelen + strlen(fname) + 10 > holderlen) { 1008 *holder = '\0'; 1009 return; 1010 } 1011 1012 if (pnamelen == 0) { 1013 sprintf(holder, "%s.dll", fname); 1014 } else if (c == ':' || c == '\\') { 1015 sprintf(holder, "%s%s.dll", pname, fname); 1016 } else { 1017 sprintf(holder, "%s\\%s.dll", pname, fname); 1018 } 1019} 1020 1021// Needs to be in os specific directory because windows requires another 1022// header file <direct.h> 1023const char* os::get_current_directory(char *buf, int buflen) { 1024 return _getcwd(buf, buflen); 1025} 1026 1027//----------------------------------------------------------- 1028// Helper functions for fatal error handler 1029 1030// The following library functions are resolved dynamically at runtime: 1031 1032// PSAPI functions, for Windows NT, 2000, XP 1033 1034// psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform 1035// SDK from Microsoft. Here are the definitions copied from psapi.h 1036typedef struct _MODULEINFO { 1037 LPVOID lpBaseOfDll; 1038 DWORD SizeOfImage; 1039 LPVOID EntryPoint; 1040} MODULEINFO, *LPMODULEINFO; 1041 1042static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD ); 1043static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD ); 1044static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD ); 1045 1046// ToolHelp Functions, for Windows 95, 98 and ME 1047 1048static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ; 1049static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ; 1050static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ; 1051 1052bool _has_psapi; 1053bool _psapi_init = false; 1054bool _has_toolhelp; 1055 1056static bool _init_psapi() { 1057 HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ; 1058 if( psapi == NULL ) return false ; 1059 1060 _EnumProcessModules = CAST_TO_FN_PTR( 1061 BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD), 1062 GetProcAddress(psapi, "EnumProcessModules")) ; 1063 _GetModuleFileNameEx = CAST_TO_FN_PTR( 1064 DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD), 1065 GetProcAddress(psapi, "GetModuleFileNameExA")); 1066 _GetModuleInformation = CAST_TO_FN_PTR( 1067 BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD), 1068 GetProcAddress(psapi, "GetModuleInformation")); 1069 1070 _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation); 1071 _psapi_init = true; 1072 return _has_psapi; 1073} 1074 1075static bool _init_toolhelp() { 1076 HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ; 1077 if (kernel32 == NULL) return false ; 1078 1079 _CreateToolhelp32Snapshot = CAST_TO_FN_PTR( 1080 HANDLE(WINAPI *)(DWORD,DWORD), 1081 GetProcAddress(kernel32, "CreateToolhelp32Snapshot")); 1082 _Module32First = CAST_TO_FN_PTR( 1083 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32), 1084 GetProcAddress(kernel32, "Module32First" )); 1085 _Module32Next = CAST_TO_FN_PTR( 1086 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32), 1087 GetProcAddress(kernel32, "Module32Next" )); 1088 1089 _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next); 1090 return _has_toolhelp; 1091} 1092 1093#ifdef _WIN64 1094// Helper routine which returns true if address in 1095// within the NTDLL address space. 1096// 1097static bool _addr_in_ntdll( address addr ) 1098{ 1099 HMODULE hmod; 1100 MODULEINFO minfo; 1101 1102 hmod = GetModuleHandle("NTDLL.DLL"); 1103 if ( hmod == NULL ) return false; 1104 if ( !_GetModuleInformation( GetCurrentProcess(), hmod, 1105 &minfo, sizeof(MODULEINFO)) ) 1106 return false; 1107 1108 if ( (addr >= minfo.lpBaseOfDll) && 1109 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) 1110 return true; 1111 else 1112 return false; 1113} 1114#endif 1115 1116 1117// Enumerate all modules for a given process ID 1118// 1119// Notice that Windows 95/98/Me and Windows NT/2000/XP have 1120// different API for doing this. We use PSAPI.DLL on NT based 1121// Windows and ToolHelp on 95/98/Me. 1122 1123// Callback function that is called by enumerate_modules() on 1124// every DLL module. 1125// Input parameters: 1126// int pid, 1127// char* module_file_name, 1128// address module_base_addr, 1129// unsigned module_size, 1130// void* param 1131typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *); 1132 1133// enumerate_modules for Windows NT, using PSAPI 1134static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param) 1135{ 1136 HANDLE hProcess ; 1137 1138# define MAX_NUM_MODULES 128 1139 HMODULE modules[MAX_NUM_MODULES]; 1140 static char filename[ MAX_PATH ]; 1141 int result = 0; 1142 1143 if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0; 1144 1145 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1146 FALSE, pid ) ; 1147 if (hProcess == NULL) return 0; 1148 1149 DWORD size_needed; 1150 if (!_EnumProcessModules(hProcess, modules, 1151 sizeof(modules), &size_needed)) { 1152 CloseHandle( hProcess ); 1153 return 0; 1154 } 1155 1156 // number of modules that are currently loaded 1157 int num_modules = size_needed / sizeof(HMODULE); 1158 1159 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1160 // Get Full pathname: 1161 if(!_GetModuleFileNameEx(hProcess, modules[i], 1162 filename, sizeof(filename))) { 1163 filename[0] = '\0'; 1164 } 1165 1166 MODULEINFO modinfo; 1167 if (!_GetModuleInformation(hProcess, modules[i], 1168 &modinfo, sizeof(modinfo))) { 1169 modinfo.lpBaseOfDll = NULL; 1170 modinfo.SizeOfImage = 0; 1171 } 1172 1173 // Invoke callback function 1174 result = func(pid, filename, (address)modinfo.lpBaseOfDll, 1175 modinfo.SizeOfImage, param); 1176 if (result) break; 1177 } 1178 1179 CloseHandle( hProcess ) ; 1180 return result; 1181} 1182 1183 1184// enumerate_modules for Windows 95/98/ME, using TOOLHELP 1185static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param) 1186{ 1187 HANDLE hSnapShot ; 1188 static MODULEENTRY32 modentry ; 1189 int result = 0; 1190 1191 if (!_has_toolhelp) return 0; 1192 1193 // Get a handle to a Toolhelp snapshot of the system 1194 hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ; 1195 if( hSnapShot == INVALID_HANDLE_VALUE ) { 1196 return FALSE ; 1197 } 1198 1199 // iterate through all modules 1200 modentry.dwSize = sizeof(MODULEENTRY32) ; 1201 bool not_done = _Module32First( hSnapShot, &modentry ) != 0; 1202 1203 while( not_done ) { 1204 // invoke the callback 1205 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr, 1206 modentry.modBaseSize, param); 1207 if (result) break; 1208 1209 modentry.dwSize = sizeof(MODULEENTRY32) ; 1210 not_done = _Module32Next( hSnapShot, &modentry ) != 0; 1211 } 1212 1213 CloseHandle(hSnapShot); 1214 return result; 1215} 1216 1217int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param ) 1218{ 1219 // Get current process ID if caller doesn't provide it. 1220 if (!pid) pid = os::current_process_id(); 1221 1222 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param); 1223 else return _enumerate_modules_windows(pid, func, param); 1224} 1225 1226struct _modinfo { 1227 address addr; 1228 char* full_path; // point to a char buffer 1229 int buflen; // size of the buffer 1230 address base_addr; 1231}; 1232 1233static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr, 1234 unsigned size, void * param) { 1235 struct _modinfo *pmod = (struct _modinfo *)param; 1236 if (!pmod) return -1; 1237 1238 if (base_addr <= pmod->addr && 1239 base_addr+size > pmod->addr) { 1240 // if a buffer is provided, copy path name to the buffer 1241 if (pmod->full_path) { 1242 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1243 } 1244 pmod->base_addr = base_addr; 1245 return 1; 1246 } 1247 return 0; 1248} 1249 1250bool os::dll_address_to_library_name(address addr, char* buf, 1251 int buflen, int* offset) { 1252// NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1253// return the full path to the DLL file, sometimes it returns path 1254// to the corresponding PDB file (debug info); sometimes it only 1255// returns partial path, which makes life painful. 1256 1257 struct _modinfo mi; 1258 mi.addr = addr; 1259 mi.full_path = buf; 1260 mi.buflen = buflen; 1261 int pid = os::current_process_id(); 1262 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) { 1263 // buf already contains path name 1264 if (offset) *offset = addr - mi.base_addr; 1265 return true; 1266 } else { 1267 if (buf) buf[0] = '\0'; 1268 if (offset) *offset = -1; 1269 return false; 1270 } 1271} 1272 1273bool os::dll_address_to_function_name(address addr, char *buf, 1274 int buflen, int *offset) { 1275 // Unimplemented on Windows - in order to use SymGetSymFromAddr(), 1276 // we need to initialize imagehlp/dbghelp, then load symbol table 1277 // for every module. That's too much work to do after a fatal error. 1278 // For an example on how to implement this function, see 1.4.2. 1279 if (offset) *offset = -1; 1280 if (buf) buf[0] = '\0'; 1281 return false; 1282} 1283 1284void* os::dll_lookup(void* handle, const char* name) { 1285 return GetProcAddress((HMODULE)handle, name); 1286} 1287 1288// save the start and end address of jvm.dll into param[0] and param[1] 1289static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr, 1290 unsigned size, void * param) { 1291 if (!param) return -1; 1292 1293 if (base_addr <= (address)_locate_jvm_dll && 1294 base_addr+size > (address)_locate_jvm_dll) { 1295 ((address*)param)[0] = base_addr; 1296 ((address*)param)[1] = base_addr + size; 1297 return 1; 1298 } 1299 return 0; 1300} 1301 1302address vm_lib_location[2]; // start and end address of jvm.dll 1303 1304// check if addr is inside jvm.dll 1305bool os::address_is_in_vm(address addr) { 1306 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1307 int pid = os::current_process_id(); 1308 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) { 1309 assert(false, "Can't find jvm module."); 1310 return false; 1311 } 1312 } 1313 1314 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1315} 1316 1317// print module info; param is outputStream* 1318static int _print_module(int pid, char* fname, address base, 1319 unsigned size, void* param) { 1320 if (!param) return -1; 1321 1322 outputStream* st = (outputStream*)param; 1323 1324 address end_addr = base + size; 1325 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname); 1326 return 0; 1327} 1328 1329// Loads .dll/.so and 1330// in case of error it checks if .dll/.so was built for the 1331// same architecture as Hotspot is running on 1332void * os::dll_load(const char *name, char *ebuf, int ebuflen) 1333{ 1334 void * result = LoadLibrary(name); 1335 if (result != NULL) 1336 { 1337 return result; 1338 } 1339 1340 long errcode = GetLastError(); 1341 if (errcode == ERROR_MOD_NOT_FOUND) { 1342 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1); 1343 ebuf[ebuflen-1]='\0'; 1344 return NULL; 1345 } 1346 1347 // Parsing dll below 1348 // If we can read dll-info and find that dll was built 1349 // for an architecture other than Hotspot is running in 1350 // - then print to buffer "DLL was built for a different architecture" 1351 // else call getLastErrorString to obtain system error message 1352 1353 // Read system error message into ebuf 1354 // It may or may not be overwritten below (in the for loop and just above) 1355 getLastErrorString(ebuf, (size_t) ebuflen); 1356 ebuf[ebuflen-1]='\0'; 1357 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0); 1358 if (file_descriptor<0) 1359 { 1360 return NULL; 1361 } 1362 1363 uint32_t signature_offset; 1364 uint16_t lib_arch=0; 1365 bool failed_to_get_lib_arch= 1366 ( 1367 //Go to position 3c in the dll 1368 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0) 1369 || 1370 // Read loacation of signature 1371 (sizeof(signature_offset)!= 1372 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset)))) 1373 || 1374 //Go to COFF File Header in dll 1375 //that is located after"signature" (4 bytes long) 1376 (os::seek_to_file_offset(file_descriptor, 1377 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0) 1378 || 1379 //Read field that contains code of architecture 1380 // that dll was build for 1381 (sizeof(lib_arch)!= 1382 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch)))) 1383 ); 1384 1385 ::close(file_descriptor); 1386 if (failed_to_get_lib_arch) 1387 { 1388 // file i/o error - report getLastErrorString(...) msg 1389 return NULL; 1390 } 1391 1392 typedef struct 1393 { 1394 uint16_t arch_code; 1395 char* arch_name; 1396 } arch_t; 1397 1398 static const arch_t arch_array[]={ 1399 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1400 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1401 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1402 }; 1403 #if (defined _M_IA64) 1404 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64; 1405 #elif (defined _M_AMD64) 1406 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64; 1407 #elif (defined _M_IX86) 1408 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386; 1409 #else 1410 #error Method os::dll_load requires that one of following \ 1411 is defined :_M_IA64,_M_AMD64 or _M_IX86 1412 #endif 1413 1414 1415 // Obtain a string for printf operation 1416 // lib_arch_str shall contain string what platform this .dll was built for 1417 // running_arch_str shall string contain what platform Hotspot was built for 1418 char *running_arch_str=NULL,*lib_arch_str=NULL; 1419 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++) 1420 { 1421 if (lib_arch==arch_array[i].arch_code) 1422 lib_arch_str=arch_array[i].arch_name; 1423 if (running_arch==arch_array[i].arch_code) 1424 running_arch_str=arch_array[i].arch_name; 1425 } 1426 1427 assert(running_arch_str, 1428 "Didn't find runing architecture code in arch_array"); 1429 1430 // If the architure is right 1431 // but some other error took place - report getLastErrorString(...) msg 1432 if (lib_arch == running_arch) 1433 { 1434 return NULL; 1435 } 1436 1437 if (lib_arch_str!=NULL) 1438 { 1439 ::_snprintf(ebuf, ebuflen-1, 1440 "Can't load %s-bit .dll on a %s-bit platform", 1441 lib_arch_str,running_arch_str); 1442 } 1443 else 1444 { 1445 // don't know what architecture this dll was build for 1446 ::_snprintf(ebuf, ebuflen-1, 1447 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1448 lib_arch,running_arch_str); 1449 } 1450 1451 return NULL; 1452} 1453 1454 1455void os::print_dll_info(outputStream *st) { 1456 int pid = os::current_process_id(); 1457 st->print_cr("Dynamic libraries:"); 1458 enumerate_modules(pid, _print_module, (void *)st); 1459} 1460 1461// function pointer to Windows API "GetNativeSystemInfo". 1462typedef void (WINAPI *GetNativeSystemInfo_func_type)(LPSYSTEM_INFO); 1463static GetNativeSystemInfo_func_type _GetNativeSystemInfo; 1464 1465void os::print_os_info(outputStream* st) { 1466 st->print("OS:"); 1467 1468 OSVERSIONINFOEX osvi; 1469 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1470 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1471 1472 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1473 st->print_cr("N/A"); 1474 return; 1475 } 1476 1477 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion; 1478 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) { 1479 switch (os_vers) { 1480 case 3051: st->print(" Windows NT 3.51"); break; 1481 case 4000: st->print(" Windows NT 4.0"); break; 1482 case 5000: st->print(" Windows 2000"); break; 1483 case 5001: st->print(" Windows XP"); break; 1484 case 5002: 1485 case 6000: { 1486 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1487 // find out whether we are running on 64 bit processor or not. 1488 SYSTEM_INFO si; 1489 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1490 // Check to see if _GetNativeSystemInfo has been initialized. 1491 if (_GetNativeSystemInfo == NULL) { 1492 HMODULE hKernel32 = GetModuleHandle(TEXT("kernel32.dll")); 1493 _GetNativeSystemInfo = 1494 CAST_TO_FN_PTR(GetNativeSystemInfo_func_type, 1495 GetProcAddress(hKernel32, 1496 "GetNativeSystemInfo")); 1497 if (_GetNativeSystemInfo == NULL) 1498 GetSystemInfo(&si); 1499 } else { 1500 _GetNativeSystemInfo(&si); 1501 } 1502 if (os_vers == 5002) { 1503 if (osvi.wProductType == VER_NT_WORKSTATION && 1504 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) 1505 st->print(" Windows XP x64 Edition"); 1506 else 1507 st->print(" Windows Server 2003 family"); 1508 } else { // os_vers == 6000 1509 if (osvi.wProductType == VER_NT_WORKSTATION) 1510 st->print(" Windows Vista"); 1511 else 1512 st->print(" Windows Server 2008"); 1513 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) 1514 st->print(" , 64 bit"); 1515 } 1516 break; 1517 } 1518 default: // future windows, print out its major and minor versions 1519 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1520 } 1521 } else { 1522 switch (os_vers) { 1523 case 4000: st->print(" Windows 95"); break; 1524 case 4010: st->print(" Windows 98"); break; 1525 case 4090: st->print(" Windows Me"); break; 1526 default: // future windows, print out its major and minor versions 1527 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1528 } 1529 } 1530 st->print(" Build %d", osvi.dwBuildNumber); 1531 st->print(" %s", osvi.szCSDVersion); // service pack 1532 st->cr(); 1533} 1534 1535void os::print_memory_info(outputStream* st) { 1536 st->print("Memory:"); 1537 st->print(" %dk page", os::vm_page_size()>>10); 1538 1539 // FIXME: GlobalMemoryStatus() may return incorrect value if total memory 1540 // is larger than 4GB 1541 MEMORYSTATUS ms; 1542 GlobalMemoryStatus(&ms); 1543 1544 st->print(", physical %uk", os::physical_memory() >> 10); 1545 st->print("(%uk free)", os::available_memory() >> 10); 1546 1547 st->print(", swap %uk", ms.dwTotalPageFile >> 10); 1548 st->print("(%uk free)", ms.dwAvailPageFile >> 10); 1549 st->cr(); 1550} 1551 1552void os::print_siginfo(outputStream *st, void *siginfo) { 1553 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1554 st->print("siginfo:"); 1555 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1556 1557 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1558 er->NumberParameters >= 2) { 1559 switch (er->ExceptionInformation[0]) { 1560 case 0: st->print(", reading address"); break; 1561 case 1: st->print(", writing address"); break; 1562 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1563 er->ExceptionInformation[0]); 1564 } 1565 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1566 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1567 er->NumberParameters >= 2 && UseSharedSpaces) { 1568 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1569 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1570 st->print("\n\nError accessing class data sharing archive." \ 1571 " Mapped file inaccessible during execution, " \ 1572 " possible disk/network problem."); 1573 } 1574 } else { 1575 int num = er->NumberParameters; 1576 if (num > 0) { 1577 st->print(", ExceptionInformation="); 1578 for (int i = 0; i < num; i++) { 1579 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1580 } 1581 } 1582 } 1583 st->cr(); 1584} 1585 1586void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1587 // do nothing 1588} 1589 1590static char saved_jvm_path[MAX_PATH] = {0}; 1591 1592// Find the full path to the current module, jvm.dll or jvm_g.dll 1593void os::jvm_path(char *buf, jint buflen) { 1594 // Error checking. 1595 if (buflen < MAX_PATH) { 1596 assert(false, "must use a large-enough buffer"); 1597 buf[0] = '\0'; 1598 return; 1599 } 1600 // Lazy resolve the path to current module. 1601 if (saved_jvm_path[0] != 0) { 1602 strcpy(buf, saved_jvm_path); 1603 return; 1604 } 1605 1606 GetModuleFileName(vm_lib_handle, buf, buflen); 1607 strcpy(saved_jvm_path, buf); 1608} 1609 1610 1611void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1612#ifndef _WIN64 1613 st->print("_"); 1614#endif 1615} 1616 1617 1618void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1619#ifndef _WIN64 1620 st->print("@%d", args_size * sizeof(int)); 1621#endif 1622} 1623 1624// sun.misc.Signal 1625// NOTE that this is a workaround for an apparent kernel bug where if 1626// a signal handler for SIGBREAK is installed then that signal handler 1627// takes priority over the console control handler for CTRL_CLOSE_EVENT. 1628// See bug 4416763. 1629static void (*sigbreakHandler)(int) = NULL; 1630 1631static void UserHandler(int sig, void *siginfo, void *context) { 1632 os::signal_notify(sig); 1633 // We need to reinstate the signal handler each time... 1634 os::signal(sig, (void*)UserHandler); 1635} 1636 1637void* os::user_handler() { 1638 return (void*) UserHandler; 1639} 1640 1641void* os::signal(int signal_number, void* handler) { 1642 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1643 void (*oldHandler)(int) = sigbreakHandler; 1644 sigbreakHandler = (void (*)(int)) handler; 1645 return (void*) oldHandler; 1646 } else { 1647 return (void*)::signal(signal_number, (void (*)(int))handler); 1648 } 1649} 1650 1651void os::signal_raise(int signal_number) { 1652 raise(signal_number); 1653} 1654 1655// The Win32 C runtime library maps all console control events other than ^C 1656// into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1657// logoff, and shutdown events. We therefore install our own console handler 1658// that raises SIGTERM for the latter cases. 1659// 1660static BOOL WINAPI consoleHandler(DWORD event) { 1661 switch(event) { 1662 case CTRL_C_EVENT: 1663 if (is_error_reported()) { 1664 // Ctrl-C is pressed during error reporting, likely because the error 1665 // handler fails to abort. Let VM die immediately. 1666 os::die(); 1667 } 1668 1669 os::signal_raise(SIGINT); 1670 return TRUE; 1671 break; 1672 case CTRL_BREAK_EVENT: 1673 if (sigbreakHandler != NULL) { 1674 (*sigbreakHandler)(SIGBREAK); 1675 } 1676 return TRUE; 1677 break; 1678 case CTRL_CLOSE_EVENT: 1679 case CTRL_LOGOFF_EVENT: 1680 case CTRL_SHUTDOWN_EVENT: 1681 os::signal_raise(SIGTERM); 1682 return TRUE; 1683 break; 1684 default: 1685 break; 1686 } 1687 return FALSE; 1688} 1689 1690/* 1691 * The following code is moved from os.cpp for making this 1692 * code platform specific, which it is by its very nature. 1693 */ 1694 1695// Return maximum OS signal used + 1 for internal use only 1696// Used as exit signal for signal_thread 1697int os::sigexitnum_pd(){ 1698 return NSIG; 1699} 1700 1701// a counter for each possible signal value, including signal_thread exit signal 1702static volatile jint pending_signals[NSIG+1] = { 0 }; 1703static HANDLE sig_sem; 1704 1705void os::signal_init_pd() { 1706 // Initialize signal structures 1707 memset((void*)pending_signals, 0, sizeof(pending_signals)); 1708 1709 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 1710 1711 // Programs embedding the VM do not want it to attempt to receive 1712 // events like CTRL_LOGOFF_EVENT, which are used to implement the 1713 // shutdown hooks mechanism introduced in 1.3. For example, when 1714 // the VM is run as part of a Windows NT service (i.e., a servlet 1715 // engine in a web server), the correct behavior is for any console 1716 // control handler to return FALSE, not TRUE, because the OS's 1717 // "final" handler for such events allows the process to continue if 1718 // it is a service (while terminating it if it is not a service). 1719 // To make this behavior uniform and the mechanism simpler, we 1720 // completely disable the VM's usage of these console events if -Xrs 1721 // (=ReduceSignalUsage) is specified. This means, for example, that 1722 // the CTRL-BREAK thread dump mechanism is also disabled in this 1723 // case. See bugs 4323062, 4345157, and related bugs. 1724 1725 if (!ReduceSignalUsage) { 1726 // Add a CTRL-C handler 1727 SetConsoleCtrlHandler(consoleHandler, TRUE); 1728 } 1729} 1730 1731void os::signal_notify(int signal_number) { 1732 BOOL ret; 1733 1734 Atomic::inc(&pending_signals[signal_number]); 1735 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 1736 assert(ret != 0, "ReleaseSemaphore() failed"); 1737} 1738 1739static int check_pending_signals(bool wait_for_signal) { 1740 DWORD ret; 1741 while (true) { 1742 for (int i = 0; i < NSIG + 1; i++) { 1743 jint n = pending_signals[i]; 1744 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1745 return i; 1746 } 1747 } 1748 if (!wait_for_signal) { 1749 return -1; 1750 } 1751 1752 JavaThread *thread = JavaThread::current(); 1753 1754 ThreadBlockInVM tbivm(thread); 1755 1756 bool threadIsSuspended; 1757 do { 1758 thread->set_suspend_equivalent(); 1759 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1760 ret = ::WaitForSingleObject(sig_sem, INFINITE); 1761 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 1762 1763 // were we externally suspended while we were waiting? 1764 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1765 if (threadIsSuspended) { 1766 // 1767 // The semaphore has been incremented, but while we were waiting 1768 // another thread suspended us. We don't want to continue running 1769 // while suspended because that would surprise the thread that 1770 // suspended us. 1771 // 1772 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 1773 assert(ret != 0, "ReleaseSemaphore() failed"); 1774 1775 thread->java_suspend_self(); 1776 } 1777 } while (threadIsSuspended); 1778 } 1779} 1780 1781int os::signal_lookup() { 1782 return check_pending_signals(false); 1783} 1784 1785int os::signal_wait() { 1786 return check_pending_signals(true); 1787} 1788 1789// Implicit OS exception handling 1790 1791LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) { 1792 JavaThread* thread = JavaThread::current(); 1793 // Save pc in thread 1794#ifdef _M_IA64 1795 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP); 1796 // Set pc to handler 1797 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 1798#elif _M_AMD64 1799 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip); 1800 // Set pc to handler 1801 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 1802#else 1803 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip); 1804 // Set pc to handler 1805 exceptionInfo->ContextRecord->Eip = (LONG)handler; 1806#endif 1807 1808 // Continue the execution 1809 return EXCEPTION_CONTINUE_EXECUTION; 1810} 1811 1812 1813// Used for PostMortemDump 1814extern "C" void safepoints(); 1815extern "C" void find(int x); 1816extern "C" void events(); 1817 1818// According to Windows API documentation, an illegal instruction sequence should generate 1819// the 0xC000001C exception code. However, real world experience shows that occasionnaly 1820// the execution of an illegal instruction can generate the exception code 0xC000001E. This 1821// seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 1822 1823#define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 1824 1825// From "Execution Protection in the Windows Operating System" draft 0.35 1826// Once a system header becomes available, the "real" define should be 1827// included or copied here. 1828#define EXCEPTION_INFO_EXEC_VIOLATION 0x08 1829 1830#define def_excpt(val) #val, val 1831 1832struct siglabel { 1833 char *name; 1834 int number; 1835}; 1836 1837struct siglabel exceptlabels[] = { 1838 def_excpt(EXCEPTION_ACCESS_VIOLATION), 1839 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 1840 def_excpt(EXCEPTION_BREAKPOINT), 1841 def_excpt(EXCEPTION_SINGLE_STEP), 1842 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 1843 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 1844 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 1845 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 1846 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 1847 def_excpt(EXCEPTION_FLT_OVERFLOW), 1848 def_excpt(EXCEPTION_FLT_STACK_CHECK), 1849 def_excpt(EXCEPTION_FLT_UNDERFLOW), 1850 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 1851 def_excpt(EXCEPTION_INT_OVERFLOW), 1852 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 1853 def_excpt(EXCEPTION_IN_PAGE_ERROR), 1854 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 1855 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 1856 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 1857 def_excpt(EXCEPTION_STACK_OVERFLOW), 1858 def_excpt(EXCEPTION_INVALID_DISPOSITION), 1859 def_excpt(EXCEPTION_GUARD_PAGE), 1860 def_excpt(EXCEPTION_INVALID_HANDLE), 1861 NULL, 0 1862}; 1863 1864const char* os::exception_name(int exception_code, char *buf, size_t size) { 1865 for (int i = 0; exceptlabels[i].name != NULL; i++) { 1866 if (exceptlabels[i].number == exception_code) { 1867 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 1868 return buf; 1869 } 1870 } 1871 1872 return NULL; 1873} 1874 1875//----------------------------------------------------------------------------- 1876LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 1877 // handle exception caused by idiv; should only happen for -MinInt/-1 1878 // (division by zero is handled explicitly) 1879#ifdef _M_IA64 1880 assert(0, "Fix Handle_IDiv_Exception"); 1881#elif _M_AMD64 1882 PCONTEXT ctx = exceptionInfo->ContextRecord; 1883 address pc = (address)ctx->Rip; 1884 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc)); 1885 assert(pc[0] == 0xF7, "not an idiv opcode"); 1886 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 1887 assert(ctx->Rax == min_jint, "unexpected idiv exception"); 1888 // set correct result values and continue after idiv instruction 1889 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 1890 ctx->Rax = (DWORD)min_jint; // result 1891 ctx->Rdx = (DWORD)0; // remainder 1892 // Continue the execution 1893#else 1894 PCONTEXT ctx = exceptionInfo->ContextRecord; 1895 address pc = (address)ctx->Eip; 1896 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc)); 1897 assert(pc[0] == 0xF7, "not an idiv opcode"); 1898 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 1899 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 1900 // set correct result values and continue after idiv instruction 1901 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 1902 ctx->Eax = (DWORD)min_jint; // result 1903 ctx->Edx = (DWORD)0; // remainder 1904 // Continue the execution 1905#endif 1906 return EXCEPTION_CONTINUE_EXECUTION; 1907} 1908 1909#ifndef _WIN64 1910//----------------------------------------------------------------------------- 1911LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 1912 // handle exception caused by native mothod modifying control word 1913 PCONTEXT ctx = exceptionInfo->ContextRecord; 1914 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 1915 1916 switch (exception_code) { 1917 case EXCEPTION_FLT_DENORMAL_OPERAND: 1918 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 1919 case EXCEPTION_FLT_INEXACT_RESULT: 1920 case EXCEPTION_FLT_INVALID_OPERATION: 1921 case EXCEPTION_FLT_OVERFLOW: 1922 case EXCEPTION_FLT_STACK_CHECK: 1923 case EXCEPTION_FLT_UNDERFLOW: 1924 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 1925 if (fp_control_word != ctx->FloatSave.ControlWord) { 1926 // Restore FPCW and mask out FLT exceptions 1927 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 1928 // Mask out pending FLT exceptions 1929 ctx->FloatSave.StatusWord &= 0xffffff00; 1930 return EXCEPTION_CONTINUE_EXECUTION; 1931 } 1932 } 1933 return EXCEPTION_CONTINUE_SEARCH; 1934} 1935#else //_WIN64 1936/* 1937 On Windows, the mxcsr control bits are non-volatile across calls 1938 See also CR 6192333 1939 If EXCEPTION_FLT_* happened after some native method modified 1940 mxcsr - it is not a jvm fault. 1941 However should we decide to restore of mxcsr after a faulty 1942 native method we can uncomment following code 1943 jint MxCsr = INITIAL_MXCSR; 1944 // we can't use StubRoutines::addr_mxcsr_std() 1945 // because in Win64 mxcsr is not saved there 1946 if (MxCsr != ctx->MxCsr) { 1947 ctx->MxCsr = MxCsr; 1948 return EXCEPTION_CONTINUE_EXECUTION; 1949 } 1950 1951*/ 1952#endif //_WIN64 1953 1954 1955// Fatal error reporting is single threaded so we can make this a 1956// static and preallocated. If it's more than MAX_PATH silently ignore 1957// it. 1958static char saved_error_file[MAX_PATH] = {0}; 1959 1960void os::set_error_file(const char *logfile) { 1961 if (strlen(logfile) <= MAX_PATH) { 1962 strncpy(saved_error_file, logfile, MAX_PATH); 1963 } 1964} 1965 1966static inline void report_error(Thread* t, DWORD exception_code, 1967 address addr, void* siginfo, void* context) { 1968 VMError err(t, exception_code, addr, siginfo, context); 1969 err.report_and_die(); 1970 1971 // If UseOsErrorReporting, this will return here and save the error file 1972 // somewhere where we can find it in the minidump. 1973} 1974 1975//----------------------------------------------------------------------------- 1976LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 1977 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 1978 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 1979#ifdef _M_IA64 1980 address pc = (address) exceptionInfo->ContextRecord->StIIP; 1981#elif _M_AMD64 1982 address pc = (address) exceptionInfo->ContextRecord->Rip; 1983#else 1984 address pc = (address) exceptionInfo->ContextRecord->Eip; 1985#endif 1986 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 1987 1988#ifndef _WIN64 1989 // Execution protection violation - win32 running on AMD64 only 1990 // Handled first to avoid misdiagnosis as a "normal" access violation; 1991 // This is safe to do because we have a new/unique ExceptionInformation 1992 // code for this condition. 1993 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 1994 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 1995 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 1996 address addr = (address) exceptionRecord->ExceptionInformation[1]; 1997 1998 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 1999 int page_size = os::vm_page_size(); 2000 2001 // Make sure the pc and the faulting address are sane. 2002 // 2003 // If an instruction spans a page boundary, and the page containing 2004 // the beginning of the instruction is executable but the following 2005 // page is not, the pc and the faulting address might be slightly 2006 // different - we still want to unguard the 2nd page in this case. 2007 // 2008 // 15 bytes seems to be a (very) safe value for max instruction size. 2009 bool pc_is_near_addr = 2010 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2011 bool instr_spans_page_boundary = 2012 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2013 (intptr_t) page_size) > 0); 2014 2015 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2016 static volatile address last_addr = 2017 (address) os::non_memory_address_word(); 2018 2019 // In conservative mode, don't unguard unless the address is in the VM 2020 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2021 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2022 2023 // Unguard and retry 2024 address page_start = 2025 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2026 bool res = os::unguard_memory((char*) page_start, page_size); 2027 2028 if (PrintMiscellaneous && Verbose) { 2029 char buf[256]; 2030 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 2031 "at " INTPTR_FORMAT 2032 ", unguarding " INTPTR_FORMAT ": %s", addr, 2033 page_start, (res ? "success" : strerror(errno))); 2034 tty->print_raw_cr(buf); 2035 } 2036 2037 // Set last_addr so if we fault again at the same address, we don't 2038 // end up in an endless loop. 2039 // 2040 // There are two potential complications here. Two threads trapping 2041 // at the same address at the same time could cause one of the 2042 // threads to think it already unguarded, and abort the VM. Likely 2043 // very rare. 2044 // 2045 // The other race involves two threads alternately trapping at 2046 // different addresses and failing to unguard the page, resulting in 2047 // an endless loop. This condition is probably even more unlikely 2048 // than the first. 2049 // 2050 // Although both cases could be avoided by using locks or thread 2051 // local last_addr, these solutions are unnecessary complication: 2052 // this handler is a best-effort safety net, not a complete solution. 2053 // It is disabled by default and should only be used as a workaround 2054 // in case we missed any no-execute-unsafe VM code. 2055 2056 last_addr = addr; 2057 2058 return EXCEPTION_CONTINUE_EXECUTION; 2059 } 2060 } 2061 2062 // Last unguard failed or not unguarding 2063 tty->print_raw_cr("Execution protection violation"); 2064 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2065 exceptionInfo->ContextRecord); 2066 return EXCEPTION_CONTINUE_SEARCH; 2067 } 2068 } 2069#endif // _WIN64 2070 2071 // Check to see if we caught the safepoint code in the 2072 // process of write protecting the memory serialization page. 2073 // It write enables the page immediately after protecting it 2074 // so just return. 2075 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { 2076 JavaThread* thread = (JavaThread*) t; 2077 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2078 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2079 if ( os::is_memory_serialize_page(thread, addr) ) { 2080 // Block current thread until the memory serialize page permission restored. 2081 os::block_on_serialize_page_trap(); 2082 return EXCEPTION_CONTINUE_EXECUTION; 2083 } 2084 } 2085 2086 2087 if (t != NULL && t->is_Java_thread()) { 2088 JavaThread* thread = (JavaThread*) t; 2089 bool in_java = thread->thread_state() == _thread_in_Java; 2090 2091 // Handle potential stack overflows up front. 2092 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2093 if (os::uses_stack_guard_pages()) { 2094#ifdef _M_IA64 2095 // 2096 // If it's a legal stack address continue, Windows will map it in. 2097 // 2098 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2099 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2100 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) 2101 return EXCEPTION_CONTINUE_EXECUTION; 2102 2103 // The register save area is the same size as the memory stack 2104 // and starts at the page just above the start of the memory stack. 2105 // If we get a fault in this area, we've run out of register 2106 // stack. If we are in java, try throwing a stack overflow exception. 2107 if (addr > thread->stack_base() && 2108 addr <= (thread->stack_base()+thread->stack_size()) ) { 2109 char buf[256]; 2110 jio_snprintf(buf, sizeof(buf), 2111 "Register stack overflow, addr:%p, stack_base:%p\n", 2112 addr, thread->stack_base() ); 2113 tty->print_raw_cr(buf); 2114 // If not in java code, return and hope for the best. 2115 return in_java ? Handle_Exception(exceptionInfo, 2116 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2117 : EXCEPTION_CONTINUE_EXECUTION; 2118 } 2119#endif 2120 if (thread->stack_yellow_zone_enabled()) { 2121 // Yellow zone violation. The o/s has unprotected the first yellow 2122 // zone page for us. Note: must call disable_stack_yellow_zone to 2123 // update the enabled status, even if the zone contains only one page. 2124 thread->disable_stack_yellow_zone(); 2125 // If not in java code, return and hope for the best. 2126 return in_java ? Handle_Exception(exceptionInfo, 2127 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2128 : EXCEPTION_CONTINUE_EXECUTION; 2129 } else { 2130 // Fatal red zone violation. 2131 thread->disable_stack_red_zone(); 2132 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2133 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2134 exceptionInfo->ContextRecord); 2135 return EXCEPTION_CONTINUE_SEARCH; 2136 } 2137 } else if (in_java) { 2138 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2139 // a one-time-only guard page, which it has released to us. The next 2140 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2141 return Handle_Exception(exceptionInfo, 2142 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2143 } else { 2144 // Can only return and hope for the best. Further stack growth will 2145 // result in an ACCESS_VIOLATION. 2146 return EXCEPTION_CONTINUE_EXECUTION; 2147 } 2148 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2149 // Either stack overflow or null pointer exception. 2150 if (in_java) { 2151 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2152 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2153 address stack_end = thread->stack_base() - thread->stack_size(); 2154 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2155 // Stack overflow. 2156 assert(!os::uses_stack_guard_pages(), 2157 "should be caught by red zone code above."); 2158 return Handle_Exception(exceptionInfo, 2159 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2160 } 2161 // 2162 // Check for safepoint polling and implicit null 2163 // We only expect null pointers in the stubs (vtable) 2164 // the rest are checked explicitly now. 2165 // 2166 CodeBlob* cb = CodeCache::find_blob(pc); 2167 if (cb != NULL) { 2168 if (os::is_poll_address(addr)) { 2169 address stub = SharedRuntime::get_poll_stub(pc); 2170 return Handle_Exception(exceptionInfo, stub); 2171 } 2172 } 2173 { 2174#ifdef _WIN64 2175 // 2176 // If it's a legal stack address map the entire region in 2177 // 2178 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2179 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2180 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) { 2181 addr = (address)((uintptr_t)addr & 2182 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2183 os::commit_memory( (char *)addr, thread->stack_base() - addr ); 2184 return EXCEPTION_CONTINUE_EXECUTION; 2185 } 2186 else 2187#endif 2188 { 2189 // Null pointer exception. 2190#ifdef _M_IA64 2191 // We catch register stack overflows in compiled code by doing 2192 // an explicit compare and executing a st8(G0, G0) if the 2193 // BSP enters into our guard area. We test for the overflow 2194 // condition and fall into the normal null pointer exception 2195 // code if BSP hasn't overflowed. 2196 if ( in_java ) { 2197 if(thread->register_stack_overflow()) { 2198 assert((address)exceptionInfo->ContextRecord->IntS3 == 2199 thread->register_stack_limit(), 2200 "GR7 doesn't contain register_stack_limit"); 2201 // Disable the yellow zone which sets the state that 2202 // we've got a stack overflow problem. 2203 if (thread->stack_yellow_zone_enabled()) { 2204 thread->disable_stack_yellow_zone(); 2205 } 2206 // Give us some room to process the exception 2207 thread->disable_register_stack_guard(); 2208 // Update GR7 with the new limit so we can continue running 2209 // compiled code. 2210 exceptionInfo->ContextRecord->IntS3 = 2211 (ULONGLONG)thread->register_stack_limit(); 2212 return Handle_Exception(exceptionInfo, 2213 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2214 } else { 2215 // 2216 // Check for implicit null 2217 // We only expect null pointers in the stubs (vtable) 2218 // the rest are checked explicitly now. 2219 // 2220 if (((uintptr_t)addr) < os::vm_page_size() ) { 2221 // an access to the first page of VM--assume it is a null pointer 2222 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2223 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2224 } 2225 } 2226 } // in_java 2227 2228 // IA64 doesn't use implicit null checking yet. So we shouldn't 2229 // get here. 2230 tty->print_raw_cr("Access violation, possible null pointer exception"); 2231 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2232 exceptionInfo->ContextRecord); 2233 return EXCEPTION_CONTINUE_SEARCH; 2234#else /* !IA64 */ 2235 2236 // Windows 98 reports faulting addresses incorrectly 2237 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2238 !os::win32::is_nt()) { 2239 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2240 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2241 } 2242 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2243 exceptionInfo->ContextRecord); 2244 return EXCEPTION_CONTINUE_SEARCH; 2245#endif 2246 } 2247 } 2248 } 2249 2250#ifdef _WIN64 2251 // Special care for fast JNI field accessors. 2252 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2253 // in and the heap gets shrunk before the field access. 2254 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2255 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2256 if (addr != (address)-1) { 2257 return Handle_Exception(exceptionInfo, addr); 2258 } 2259 } 2260#endif 2261 2262#ifdef _WIN64 2263 // Windows will sometimes generate an access violation 2264 // when we call malloc. Since we use VectoredExceptions 2265 // on 64 bit platforms, we see this exception. We must 2266 // pass this exception on so Windows can recover. 2267 // We check to see if the pc of the fault is in NTDLL.DLL 2268 // if so, we pass control on to Windows for handling. 2269 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH; 2270#endif 2271 2272 // Stack overflow or null pointer exception in native code. 2273 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2274 exceptionInfo->ContextRecord); 2275 return EXCEPTION_CONTINUE_SEARCH; 2276 } 2277 2278 if (in_java) { 2279 switch (exception_code) { 2280 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2281 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2282 2283 case EXCEPTION_INT_OVERFLOW: 2284 return Handle_IDiv_Exception(exceptionInfo); 2285 2286 } // switch 2287 } 2288#ifndef _WIN64 2289 if ((thread->thread_state() == _thread_in_Java) || 2290 (thread->thread_state() == _thread_in_native) ) 2291 { 2292 LONG result=Handle_FLT_Exception(exceptionInfo); 2293 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2294 } 2295#endif //_WIN64 2296 } 2297 2298 if (exception_code != EXCEPTION_BREAKPOINT) { 2299#ifndef _WIN64 2300 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2301 exceptionInfo->ContextRecord); 2302#else 2303 // Itanium Windows uses a VectoredExceptionHandler 2304 // Which means that C++ programatic exception handlers (try/except) 2305 // will get here. Continue the search for the right except block if 2306 // the exception code is not a fatal code. 2307 switch ( exception_code ) { 2308 case EXCEPTION_ACCESS_VIOLATION: 2309 case EXCEPTION_STACK_OVERFLOW: 2310 case EXCEPTION_ILLEGAL_INSTRUCTION: 2311 case EXCEPTION_ILLEGAL_INSTRUCTION_2: 2312 case EXCEPTION_INT_OVERFLOW: 2313 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2314 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2315 exceptionInfo->ContextRecord); 2316 } 2317 break; 2318 default: 2319 break; 2320 } 2321#endif 2322 } 2323 return EXCEPTION_CONTINUE_SEARCH; 2324} 2325 2326#ifndef _WIN64 2327// Special care for fast JNI accessors. 2328// jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2329// the heap gets shrunk before the field access. 2330// Need to install our own structured exception handler since native code may 2331// install its own. 2332LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2333 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2334 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2335 address pc = (address) exceptionInfo->ContextRecord->Eip; 2336 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2337 if (addr != (address)-1) { 2338 return Handle_Exception(exceptionInfo, addr); 2339 } 2340 } 2341 return EXCEPTION_CONTINUE_SEARCH; 2342} 2343 2344#define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \ 2345Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \ 2346 __try { \ 2347 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \ 2348 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \ 2349 } \ 2350 return 0; \ 2351} 2352 2353DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2354DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2355DEFINE_FAST_GETFIELD(jchar, char, Char) 2356DEFINE_FAST_GETFIELD(jshort, short, Short) 2357DEFINE_FAST_GETFIELD(jint, int, Int) 2358DEFINE_FAST_GETFIELD(jlong, long, Long) 2359DEFINE_FAST_GETFIELD(jfloat, float, Float) 2360DEFINE_FAST_GETFIELD(jdouble, double, Double) 2361 2362address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2363 switch (type) { 2364 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2365 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2366 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2367 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2368 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2369 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2370 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2371 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2372 default: ShouldNotReachHere(); 2373 } 2374 return (address)-1; 2375} 2376#endif 2377 2378// Virtual Memory 2379 2380int os::vm_page_size() { return os::win32::vm_page_size(); } 2381int os::vm_allocation_granularity() { 2382 return os::win32::vm_allocation_granularity(); 2383} 2384 2385// Windows large page support is available on Windows 2003. In order to use 2386// large page memory, the administrator must first assign additional privilege 2387// to the user: 2388// + select Control Panel -> Administrative Tools -> Local Security Policy 2389// + select Local Policies -> User Rights Assignment 2390// + double click "Lock pages in memory", add users and/or groups 2391// + reboot 2392// Note the above steps are needed for administrator as well, as administrators 2393// by default do not have the privilege to lock pages in memory. 2394// 2395// Note about Windows 2003: although the API supports committing large page 2396// memory on a page-by-page basis and VirtualAlloc() returns success under this 2397// scenario, I found through experiment it only uses large page if the entire 2398// memory region is reserved and committed in a single VirtualAlloc() call. 2399// This makes Windows large page support more or less like Solaris ISM, in 2400// that the entire heap must be committed upfront. This probably will change 2401// in the future, if so the code below needs to be revisited. 2402 2403#ifndef MEM_LARGE_PAGES 2404#define MEM_LARGE_PAGES 0x20000000 2405#endif 2406 2407// GetLargePageMinimum is only available on Windows 2003. The other functions 2408// are available on NT but not on Windows 98/Me. We have to resolve them at 2409// runtime. 2410typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void); 2411typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type) 2412 (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 2413typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE); 2414typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID); 2415 2416static GetLargePageMinimum_func_type _GetLargePageMinimum; 2417static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges; 2418static OpenProcessToken_func_type _OpenProcessToken; 2419static LookupPrivilegeValue_func_type _LookupPrivilegeValue; 2420 2421static HINSTANCE _kernel32; 2422static HINSTANCE _advapi32; 2423static HANDLE _hProcess; 2424static HANDLE _hToken; 2425 2426static size_t _large_page_size = 0; 2427 2428static bool resolve_functions_for_large_page_init() { 2429 _kernel32 = LoadLibrary("kernel32.dll"); 2430 if (_kernel32 == NULL) return false; 2431 2432 _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type, 2433 GetProcAddress(_kernel32, "GetLargePageMinimum")); 2434 if (_GetLargePageMinimum == NULL) return false; 2435 2436 _advapi32 = LoadLibrary("advapi32.dll"); 2437 if (_advapi32 == NULL) return false; 2438 2439 _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type, 2440 GetProcAddress(_advapi32, "AdjustTokenPrivileges")); 2441 _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type, 2442 GetProcAddress(_advapi32, "OpenProcessToken")); 2443 _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type, 2444 GetProcAddress(_advapi32, "LookupPrivilegeValueA")); 2445 return _AdjustTokenPrivileges != NULL && 2446 _OpenProcessToken != NULL && 2447 _LookupPrivilegeValue != NULL; 2448} 2449 2450static bool request_lock_memory_privilege() { 2451 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2452 os::current_process_id()); 2453 2454 LUID luid; 2455 if (_hProcess != NULL && 2456 _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2457 _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2458 2459 TOKEN_PRIVILEGES tp; 2460 tp.PrivilegeCount = 1; 2461 tp.Privileges[0].Luid = luid; 2462 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2463 2464 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2465 // privilege. Check GetLastError() too. See MSDN document. 2466 if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2467 (GetLastError() == ERROR_SUCCESS)) { 2468 return true; 2469 } 2470 } 2471 2472 return false; 2473} 2474 2475static void cleanup_after_large_page_init() { 2476 _GetLargePageMinimum = NULL; 2477 _AdjustTokenPrivileges = NULL; 2478 _OpenProcessToken = NULL; 2479 _LookupPrivilegeValue = NULL; 2480 if (_kernel32) FreeLibrary(_kernel32); 2481 _kernel32 = NULL; 2482 if (_advapi32) FreeLibrary(_advapi32); 2483 _advapi32 = NULL; 2484 if (_hProcess) CloseHandle(_hProcess); 2485 _hProcess = NULL; 2486 if (_hToken) CloseHandle(_hToken); 2487 _hToken = NULL; 2488} 2489 2490bool os::large_page_init() { 2491 if (!UseLargePages) return false; 2492 2493 // print a warning if any large page related flag is specified on command line 2494 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2495 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2496 bool success = false; 2497 2498# define WARN(msg) if (warn_on_failure) { warning(msg); } 2499 if (resolve_functions_for_large_page_init()) { 2500 if (request_lock_memory_privilege()) { 2501 size_t s = _GetLargePageMinimum(); 2502 if (s) { 2503#if defined(IA32) || defined(AMD64) 2504 if (s > 4*M || LargePageSizeInBytes > 4*M) { 2505 WARN("JVM cannot use large pages bigger than 4mb."); 2506 } else { 2507#endif 2508 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 2509 _large_page_size = LargePageSizeInBytes; 2510 } else { 2511 _large_page_size = s; 2512 } 2513 success = true; 2514#if defined(IA32) || defined(AMD64) 2515 } 2516#endif 2517 } else { 2518 WARN("Large page is not supported by the processor."); 2519 } 2520 } else { 2521 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 2522 } 2523 } else { 2524 WARN("Large page is not supported by the operating system."); 2525 } 2526#undef WARN 2527 2528 const size_t default_page_size = (size_t) vm_page_size(); 2529 if (success && _large_page_size > default_page_size) { 2530 _page_sizes[0] = _large_page_size; 2531 _page_sizes[1] = default_page_size; 2532 _page_sizes[2] = 0; 2533 } 2534 2535 cleanup_after_large_page_init(); 2536 return success; 2537} 2538 2539// On win32, one cannot release just a part of reserved memory, it's an 2540// all or nothing deal. When we split a reservation, we must break the 2541// reservation into two reservations. 2542void os::split_reserved_memory(char *base, size_t size, size_t split, 2543 bool realloc) { 2544 if (size > 0) { 2545 release_memory(base, size); 2546 if (realloc) { 2547 reserve_memory(split, base); 2548 } 2549 if (size != split) { 2550 reserve_memory(size - split, base + split); 2551 } 2552 } 2553} 2554 2555char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 2556 assert((size_t)addr % os::vm_allocation_granularity() == 0, 2557 "reserve alignment"); 2558 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size"); 2559 char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, 2560 PAGE_EXECUTE_READWRITE); 2561 assert(res == NULL || addr == NULL || addr == res, 2562 "Unexpected address from reserve."); 2563 return res; 2564} 2565 2566// Reserve memory at an arbitrary address, only if that area is 2567// available (and not reserved for something else). 2568char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2569 // Windows os::reserve_memory() fails of the requested address range is 2570 // not avilable. 2571 return reserve_memory(bytes, requested_addr); 2572} 2573 2574size_t os::large_page_size() { 2575 return _large_page_size; 2576} 2577 2578bool os::can_commit_large_page_memory() { 2579 // Windows only uses large page memory when the entire region is reserved 2580 // and committed in a single VirtualAlloc() call. This may change in the 2581 // future, but with Windows 2003 it's not possible to commit on demand. 2582 return false; 2583} 2584 2585bool os::can_execute_large_page_memory() { 2586 return true; 2587} 2588 2589char* os::reserve_memory_special(size_t bytes) { 2590 2591 if (UseLargePagesIndividualAllocation) { 2592 if (TracePageSizes && Verbose) { 2593 tty->print_cr("Reserving large pages individually."); 2594 } 2595 char * p_buf; 2596 // first reserve enough address space in advance since we want to be 2597 // able to break a single contiguous virtual address range into multiple 2598 // large page commits but WS2003 does not allow reserving large page space 2599 // so we just use 4K pages for reserve, this gives us a legal contiguous 2600 // address space. then we will deallocate that reservation, and re alloc 2601 // using large pages 2602 const size_t size_of_reserve = bytes + _large_page_size; 2603 if (bytes > size_of_reserve) { 2604 // Overflowed. 2605 warning("Individually allocated large pages failed, " 2606 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 2607 return NULL; 2608 } 2609 p_buf = (char *) VirtualAlloc(NULL, 2610 size_of_reserve, // size of Reserve 2611 MEM_RESERVE, 2612 PAGE_EXECUTE_READWRITE); 2613 // If reservation failed, return NULL 2614 if (p_buf == NULL) return NULL; 2615 2616 release_memory(p_buf, bytes + _large_page_size); 2617 // round up to page boundary. If the size_of_reserve did not 2618 // overflow and the reservation did not fail, this align up 2619 // should not overflow. 2620 p_buf = (char *) align_size_up((size_t)p_buf, _large_page_size); 2621 2622 // now go through and allocate one page at a time until all bytes are 2623 // allocated 2624 size_t bytes_remaining = align_size_up(bytes, _large_page_size); 2625 // An overflow of align_size_up() would have been caught above 2626 // in the calculation of size_of_reserve. 2627 char * next_alloc_addr = p_buf; 2628 2629#ifdef ASSERT 2630 // Variable for the failure injection 2631 long ran_num = os::random(); 2632 size_t fail_after = ran_num % bytes; 2633#endif 2634 2635 while (bytes_remaining) { 2636 size_t bytes_to_rq = MIN2(bytes_remaining, _large_page_size); 2637 // Note allocate and commit 2638 char * p_new; 2639 2640#ifdef ASSERT 2641 bool inject_error = LargePagesIndividualAllocationInjectError && 2642 (bytes_remaining <= fail_after); 2643#else 2644 const bool inject_error = false; 2645#endif 2646 2647 if (inject_error) { 2648 p_new = NULL; 2649 } else { 2650 p_new = (char *) VirtualAlloc(next_alloc_addr, 2651 bytes_to_rq, 2652 MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES, 2653 PAGE_EXECUTE_READWRITE); 2654 } 2655 2656 if (p_new == NULL) { 2657 // Free any allocated pages 2658 if (next_alloc_addr > p_buf) { 2659 // Some memory was committed so release it. 2660 size_t bytes_to_release = bytes - bytes_remaining; 2661 release_memory(p_buf, bytes_to_release); 2662 } 2663#ifdef ASSERT 2664 if (UseLargePagesIndividualAllocation && 2665 LargePagesIndividualAllocationInjectError) { 2666 if (TracePageSizes && Verbose) { 2667 tty->print_cr("Reserving large pages individually failed."); 2668 } 2669 } 2670#endif 2671 return NULL; 2672 } 2673 bytes_remaining -= bytes_to_rq; 2674 next_alloc_addr += bytes_to_rq; 2675 } 2676 2677 return p_buf; 2678 2679 } else { 2680 // normal policy just allocate it all at once 2681 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 2682 char * res = (char *)VirtualAlloc(NULL, 2683 bytes, 2684 flag, 2685 PAGE_EXECUTE_READWRITE); 2686 return res; 2687 } 2688} 2689 2690bool os::release_memory_special(char* base, size_t bytes) { 2691 return release_memory(base, bytes); 2692} 2693 2694void os::print_statistics() { 2695} 2696 2697bool os::commit_memory(char* addr, size_t bytes) { 2698 if (bytes == 0) { 2699 // Don't bother the OS with noops. 2700 return true; 2701 } 2702 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 2703 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 2704 // Don't attempt to print anything if the OS call fails. We're 2705 // probably low on resources, so the print itself may cause crashes. 2706 return VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_EXECUTE_READWRITE) != NULL; 2707} 2708 2709bool os::commit_memory(char* addr, size_t size, size_t alignment_hint) { 2710 return commit_memory(addr, size); 2711} 2712 2713bool os::uncommit_memory(char* addr, size_t bytes) { 2714 if (bytes == 0) { 2715 // Don't bother the OS with noops. 2716 return true; 2717 } 2718 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 2719 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 2720 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0; 2721} 2722 2723bool os::release_memory(char* addr, size_t bytes) { 2724 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 2725} 2726 2727// Set protections specified 2728bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2729 bool is_committed) { 2730 unsigned int p = 0; 2731 switch (prot) { 2732 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 2733 case MEM_PROT_READ: p = PAGE_READONLY; break; 2734 case MEM_PROT_RW: p = PAGE_READWRITE; break; 2735 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 2736 default: 2737 ShouldNotReachHere(); 2738 } 2739 2740 DWORD old_status; 2741 2742 // Strange enough, but on Win32 one can change protection only for committed 2743 // memory, not a big deal anyway, as bytes less or equal than 64K 2744 if (!is_committed && !commit_memory(addr, bytes)) { 2745 fatal("cannot commit protection page"); 2746 } 2747 // One cannot use os::guard_memory() here, as on Win32 guard page 2748 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 2749 // 2750 // Pages in the region become guard pages. Any attempt to access a guard page 2751 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 2752 // the guard page status. Guard pages thus act as a one-time access alarm. 2753 return VirtualProtect(addr, bytes, p, &old_status) != 0; 2754} 2755 2756bool os::guard_memory(char* addr, size_t bytes) { 2757 DWORD old_status; 2758 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE | PAGE_GUARD, &old_status) != 0; 2759} 2760 2761bool os::unguard_memory(char* addr, size_t bytes) { 2762 DWORD old_status; 2763 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &old_status) != 0; 2764} 2765 2766void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 2767void os::free_memory(char *addr, size_t bytes) { } 2768void os::numa_make_global(char *addr, size_t bytes) { } 2769void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 2770bool os::numa_topology_changed() { return false; } 2771size_t os::numa_get_groups_num() { return 1; } 2772int os::numa_get_group_id() { return 0; } 2773size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2774 if (size > 0) { 2775 ids[0] = 0; 2776 return 1; 2777 } 2778 return 0; 2779} 2780 2781bool os::get_page_info(char *start, page_info* info) { 2782 return false; 2783} 2784 2785char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2786 return end; 2787} 2788 2789char* os::non_memory_address_word() { 2790 // Must never look like an address returned by reserve_memory, 2791 // even in its subfields (as defined by the CPU immediate fields, 2792 // if the CPU splits constants across multiple instructions). 2793 return (char*)-1; 2794} 2795 2796#define MAX_ERROR_COUNT 100 2797#define SYS_THREAD_ERROR 0xffffffffUL 2798 2799void os::pd_start_thread(Thread* thread) { 2800 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 2801 // Returns previous suspend state: 2802 // 0: Thread was not suspended 2803 // 1: Thread is running now 2804 // >1: Thread is still suspended. 2805 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 2806} 2807 2808size_t os::read(int fd, void *buf, unsigned int nBytes) { 2809 return ::read(fd, buf, nBytes); 2810} 2811 2812class HighResolutionInterval { 2813 // The default timer resolution seems to be 10 milliseconds. 2814 // (Where is this written down?) 2815 // If someone wants to sleep for only a fraction of the default, 2816 // then we set the timer resolution down to 1 millisecond for 2817 // the duration of their interval. 2818 // We carefully set the resolution back, since otherwise we 2819 // seem to incur an overhead (3%?) that we don't need. 2820 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 2821 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 2822 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 2823 // timeBeginPeriod() if the relative error exceeded some threshold. 2824 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 2825 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 2826 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 2827 // resolution timers running. 2828private: 2829 jlong resolution; 2830public: 2831 HighResolutionInterval(jlong ms) { 2832 resolution = ms % 10L; 2833 if (resolution != 0) { 2834 MMRESULT result = timeBeginPeriod(1L); 2835 } 2836 } 2837 ~HighResolutionInterval() { 2838 if (resolution != 0) { 2839 MMRESULT result = timeEndPeriod(1L); 2840 } 2841 resolution = 0L; 2842 } 2843}; 2844 2845int os::sleep(Thread* thread, jlong ms, bool interruptable) { 2846 jlong limit = (jlong) MAXDWORD; 2847 2848 while(ms > limit) { 2849 int res; 2850 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) 2851 return res; 2852 ms -= limit; 2853 } 2854 2855 assert(thread == Thread::current(), "thread consistency check"); 2856 OSThread* osthread = thread->osthread(); 2857 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 2858 int result; 2859 if (interruptable) { 2860 assert(thread->is_Java_thread(), "must be java thread"); 2861 JavaThread *jt = (JavaThread *) thread; 2862 ThreadBlockInVM tbivm(jt); 2863 2864 jt->set_suspend_equivalent(); 2865 // cleared by handle_special_suspend_equivalent_condition() or 2866 // java_suspend_self() via check_and_wait_while_suspended() 2867 2868 HANDLE events[1]; 2869 events[0] = osthread->interrupt_event(); 2870 HighResolutionInterval *phri=NULL; 2871 if(!ForceTimeHighResolution) 2872 phri = new HighResolutionInterval( ms ); 2873 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 2874 result = OS_TIMEOUT; 2875 } else { 2876 ResetEvent(osthread->interrupt_event()); 2877 osthread->set_interrupted(false); 2878 result = OS_INTRPT; 2879 } 2880 delete phri; //if it is NULL, harmless 2881 2882 // were we externally suspended while we were waiting? 2883 jt->check_and_wait_while_suspended(); 2884 } else { 2885 assert(!thread->is_Java_thread(), "must not be java thread"); 2886 Sleep((long) ms); 2887 result = OS_TIMEOUT; 2888 } 2889 return result; 2890} 2891 2892// Sleep forever; naked call to OS-specific sleep; use with CAUTION 2893void os::infinite_sleep() { 2894 while (true) { // sleep forever ... 2895 Sleep(100000); // ... 100 seconds at a time 2896 } 2897} 2898 2899typedef BOOL (WINAPI * STTSignature)(void) ; 2900 2901os::YieldResult os::NakedYield() { 2902 // Use either SwitchToThread() or Sleep(0) 2903 // Consider passing back the return value from SwitchToThread(). 2904 // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread. 2905 // In that case we revert to Sleep(0). 2906 static volatile STTSignature stt = (STTSignature) 1 ; 2907 2908 if (stt == ((STTSignature) 1)) { 2909 stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ; 2910 // It's OK if threads race during initialization as the operation above is idempotent. 2911 } 2912 if (stt != NULL) { 2913 return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ; 2914 } else { 2915 Sleep (0) ; 2916 } 2917 return os::YIELD_UNKNOWN ; 2918} 2919 2920void os::yield() { os::NakedYield(); } 2921 2922void os::yield_all(int attempts) { 2923 // Yields to all threads, including threads with lower priorities 2924 Sleep(1); 2925} 2926 2927// Win32 only gives you access to seven real priorities at a time, 2928// so we compress Java's ten down to seven. It would be better 2929// if we dynamically adjusted relative priorities. 2930 2931int os::java_to_os_priority[MaxPriority + 1] = { 2932 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 2933 THREAD_PRIORITY_LOWEST, // 1 MinPriority 2934 THREAD_PRIORITY_LOWEST, // 2 2935 THREAD_PRIORITY_BELOW_NORMAL, // 3 2936 THREAD_PRIORITY_BELOW_NORMAL, // 4 2937 THREAD_PRIORITY_NORMAL, // 5 NormPriority 2938 THREAD_PRIORITY_NORMAL, // 6 2939 THREAD_PRIORITY_ABOVE_NORMAL, // 7 2940 THREAD_PRIORITY_ABOVE_NORMAL, // 8 2941 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 2942 THREAD_PRIORITY_HIGHEST // 10 MaxPriority 2943}; 2944 2945int prio_policy1[MaxPriority + 1] = { 2946 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 2947 THREAD_PRIORITY_LOWEST, // 1 MinPriority 2948 THREAD_PRIORITY_LOWEST, // 2 2949 THREAD_PRIORITY_BELOW_NORMAL, // 3 2950 THREAD_PRIORITY_BELOW_NORMAL, // 4 2951 THREAD_PRIORITY_NORMAL, // 5 NormPriority 2952 THREAD_PRIORITY_ABOVE_NORMAL, // 6 2953 THREAD_PRIORITY_ABOVE_NORMAL, // 7 2954 THREAD_PRIORITY_HIGHEST, // 8 2955 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 2956 THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority 2957}; 2958 2959static int prio_init() { 2960 // If ThreadPriorityPolicy is 1, switch tables 2961 if (ThreadPriorityPolicy == 1) { 2962 int i; 2963 for (i = 0; i < MaxPriority + 1; i++) { 2964 os::java_to_os_priority[i] = prio_policy1[i]; 2965 } 2966 } 2967 return 0; 2968} 2969 2970OSReturn os::set_native_priority(Thread* thread, int priority) { 2971 if (!UseThreadPriorities) return OS_OK; 2972 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 2973 return ret ? OS_OK : OS_ERR; 2974} 2975 2976OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) { 2977 if ( !UseThreadPriorities ) { 2978 *priority_ptr = java_to_os_priority[NormPriority]; 2979 return OS_OK; 2980 } 2981 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 2982 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 2983 assert(false, "GetThreadPriority failed"); 2984 return OS_ERR; 2985 } 2986 *priority_ptr = os_prio; 2987 return OS_OK; 2988} 2989 2990 2991// Hint to the underlying OS that a task switch would not be good. 2992// Void return because it's a hint and can fail. 2993void os::hint_no_preempt() {} 2994 2995void os::interrupt(Thread* thread) { 2996 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 2997 "possibility of dangling Thread pointer"); 2998 2999 OSThread* osthread = thread->osthread(); 3000 osthread->set_interrupted(true); 3001 // More than one thread can get here with the same value of osthread, 3002 // resulting in multiple notifications. We do, however, want the store 3003 // to interrupted() to be visible to other threads before we post 3004 // the interrupt event. 3005 OrderAccess::release(); 3006 SetEvent(osthread->interrupt_event()); 3007 // For JSR166: unpark after setting status 3008 if (thread->is_Java_thread()) 3009 ((JavaThread*)thread)->parker()->unpark(); 3010 3011 ParkEvent * ev = thread->_ParkEvent ; 3012 if (ev != NULL) ev->unpark() ; 3013 3014} 3015 3016 3017bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3018 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3019 "possibility of dangling Thread pointer"); 3020 3021 OSThread* osthread = thread->osthread(); 3022 bool interrupted; 3023 interrupted = osthread->interrupted(); 3024 if (clear_interrupted == true) { 3025 osthread->set_interrupted(false); 3026 ResetEvent(osthread->interrupt_event()); 3027 } // Otherwise leave the interrupted state alone 3028 3029 return interrupted; 3030} 3031 3032// Get's a pc (hint) for a running thread. Currently used only for profiling. 3033ExtendedPC os::get_thread_pc(Thread* thread) { 3034 CONTEXT context; 3035 context.ContextFlags = CONTEXT_CONTROL; 3036 HANDLE handle = thread->osthread()->thread_handle(); 3037#ifdef _M_IA64 3038 assert(0, "Fix get_thread_pc"); 3039 return ExtendedPC(NULL); 3040#else 3041 if (GetThreadContext(handle, &context)) { 3042#ifdef _M_AMD64 3043 return ExtendedPC((address) context.Rip); 3044#else 3045 return ExtendedPC((address) context.Eip); 3046#endif 3047 } else { 3048 return ExtendedPC(NULL); 3049 } 3050#endif 3051} 3052 3053// GetCurrentThreadId() returns DWORD 3054intx os::current_thread_id() { return GetCurrentThreadId(); } 3055 3056static int _initial_pid = 0; 3057 3058int os::current_process_id() 3059{ 3060 return (_initial_pid ? _initial_pid : _getpid()); 3061} 3062 3063int os::win32::_vm_page_size = 0; 3064int os::win32::_vm_allocation_granularity = 0; 3065int os::win32::_processor_type = 0; 3066// Processor level is not available on non-NT systems, use vm_version instead 3067int os::win32::_processor_level = 0; 3068julong os::win32::_physical_memory = 0; 3069size_t os::win32::_default_stack_size = 0; 3070 3071 intx os::win32::_os_thread_limit = 0; 3072volatile intx os::win32::_os_thread_count = 0; 3073 3074bool os::win32::_is_nt = false; 3075bool os::win32::_is_windows_2003 = false; 3076 3077 3078void os::win32::initialize_system_info() { 3079 SYSTEM_INFO si; 3080 GetSystemInfo(&si); 3081 _vm_page_size = si.dwPageSize; 3082 _vm_allocation_granularity = si.dwAllocationGranularity; 3083 _processor_type = si.dwProcessorType; 3084 _processor_level = si.wProcessorLevel; 3085 _processor_count = si.dwNumberOfProcessors; 3086 3087 MEMORYSTATUS ms; 3088 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3089 // dwMemoryLoad (% of memory in use) 3090 GlobalMemoryStatus(&ms); 3091 _physical_memory = ms.dwTotalPhys; 3092 3093 OSVERSIONINFO oi; 3094 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); 3095 GetVersionEx(&oi); 3096 switch(oi.dwPlatformId) { 3097 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 3098 case VER_PLATFORM_WIN32_NT: 3099 _is_nt = true; 3100 { 3101 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3102 if (os_vers == 5002) { 3103 _is_windows_2003 = true; 3104 } 3105 } 3106 break; 3107 default: fatal("Unknown platform"); 3108 } 3109 3110 _default_stack_size = os::current_stack_size(); 3111 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3112 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3113 "stack size not a multiple of page size"); 3114 3115 initialize_performance_counter(); 3116 3117 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is 3118 // known to deadlock the system, if the VM issues to thread operations with 3119 // a too high frequency, e.g., such as changing the priorities. 3120 // The 6000 seems to work well - no deadlocks has been notices on the test 3121 // programs that we have seen experience this problem. 3122 if (!os::win32::is_nt()) { 3123 StarvationMonitorInterval = 6000; 3124 } 3125} 3126 3127 3128void os::win32::setmode_streams() { 3129 _setmode(_fileno(stdin), _O_BINARY); 3130 _setmode(_fileno(stdout), _O_BINARY); 3131 _setmode(_fileno(stderr), _O_BINARY); 3132} 3133 3134 3135int os::message_box(const char* title, const char* message) { 3136 int result = MessageBox(NULL, message, title, 3137 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 3138 return result == IDYES; 3139} 3140 3141int os::allocate_thread_local_storage() { 3142 return TlsAlloc(); 3143} 3144 3145 3146void os::free_thread_local_storage(int index) { 3147 TlsFree(index); 3148} 3149 3150 3151void os::thread_local_storage_at_put(int index, void* value) { 3152 TlsSetValue(index, value); 3153 assert(thread_local_storage_at(index) == value, "Just checking"); 3154} 3155 3156 3157void* os::thread_local_storage_at(int index) { 3158 return TlsGetValue(index); 3159} 3160 3161 3162#ifndef PRODUCT 3163#ifndef _WIN64 3164// Helpers to check whether NX protection is enabled 3165int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 3166 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 3167 pex->ExceptionRecord->NumberParameters > 0 && 3168 pex->ExceptionRecord->ExceptionInformation[0] == 3169 EXCEPTION_INFO_EXEC_VIOLATION) { 3170 return EXCEPTION_EXECUTE_HANDLER; 3171 } 3172 return EXCEPTION_CONTINUE_SEARCH; 3173} 3174 3175void nx_check_protection() { 3176 // If NX is enabled we'll get an exception calling into code on the stack 3177 char code[] = { (char)0xC3 }; // ret 3178 void *code_ptr = (void *)code; 3179 __try { 3180 __asm call code_ptr 3181 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 3182 tty->print_raw_cr("NX protection detected."); 3183 } 3184} 3185#endif // _WIN64 3186#endif // PRODUCT 3187 3188// this is called _before_ the global arguments have been parsed 3189void os::init(void) { 3190 _initial_pid = _getpid(); 3191 3192 init_random(1234567); 3193 3194 win32::initialize_system_info(); 3195 win32::setmode_streams(); 3196 init_page_sizes((size_t) win32::vm_page_size()); 3197 3198 // For better scalability on MP systems (must be called after initialize_system_info) 3199#ifndef PRODUCT 3200 if (is_MP()) { 3201 NoYieldsInMicrolock = true; 3202 } 3203#endif 3204 // This may be overridden later when argument processing is done. 3205 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, 3206 os::win32::is_windows_2003()); 3207 3208 // Initialize main_process and main_thread 3209 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 3210 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 3211 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 3212 fatal("DuplicateHandle failed\n"); 3213 } 3214 main_thread_id = (int) GetCurrentThreadId(); 3215} 3216 3217// To install functions for atexit processing 3218extern "C" { 3219 static void perfMemory_exit_helper() { 3220 perfMemory_exit(); 3221 } 3222} 3223 3224 3225// this is called _after_ the global arguments have been parsed 3226jint os::init_2(void) { 3227 // Allocate a single page and mark it as readable for safepoint polling 3228 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 3229 guarantee( polling_page != NULL, "Reserve Failed for polling page"); 3230 3231 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 3232 guarantee( return_page != NULL, "Commit Failed for polling page"); 3233 3234 os::set_polling_page( polling_page ); 3235 3236#ifndef PRODUCT 3237 if( Verbose && PrintMiscellaneous ) 3238 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 3239#endif 3240 3241 if (!UseMembar) { 3242 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_EXECUTE_READWRITE); 3243 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 3244 3245 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_EXECUTE_READWRITE); 3246 guarantee( return_page != NULL, "Commit Failed for memory serialize page"); 3247 3248 os::set_memory_serialize_page( mem_serialize_page ); 3249 3250#ifndef PRODUCT 3251 if(Verbose && PrintMiscellaneous) 3252 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3253#endif 3254} 3255 3256 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init()); 3257 3258 // Setup Windows Exceptions 3259 3260 // On Itanium systems, Structured Exception Handling does not 3261 // work since stack frames must be walkable by the OS. Since 3262 // much of our code is dynamically generated, and we do not have 3263 // proper unwind .xdata sections, the system simply exits 3264 // rather than delivering the exception. To work around 3265 // this we use VectorExceptions instead. 3266#ifdef _WIN64 3267 if (UseVectoredExceptions) { 3268 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter); 3269 } 3270#endif 3271 3272 // for debugging float code generation bugs 3273 if (ForceFloatExceptions) { 3274#ifndef _WIN64 3275 static long fp_control_word = 0; 3276 __asm { fstcw fp_control_word } 3277 // see Intel PPro Manual, Vol. 2, p 7-16 3278 const long precision = 0x20; 3279 const long underflow = 0x10; 3280 const long overflow = 0x08; 3281 const long zero_div = 0x04; 3282 const long denorm = 0x02; 3283 const long invalid = 0x01; 3284 fp_control_word |= invalid; 3285 __asm { fldcw fp_control_word } 3286#endif 3287 } 3288 3289 // Initialize HPI. 3290 jint hpi_result = hpi::initialize(); 3291 if (hpi_result != JNI_OK) { return hpi_result; } 3292 3293 // If stack_commit_size is 0, windows will reserve the default size, 3294 // but only commit a small portion of it. 3295 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 3296 size_t default_reserve_size = os::win32::default_stack_size(); 3297 size_t actual_reserve_size = stack_commit_size; 3298 if (stack_commit_size < default_reserve_size) { 3299 // If stack_commit_size == 0, we want this too 3300 actual_reserve_size = default_reserve_size; 3301 } 3302 3303 JavaThread::set_stack_size_at_create(stack_commit_size); 3304 3305 // Calculate theoretical max. size of Threads to guard gainst artifical 3306 // out-of-memory situations, where all available address-space has been 3307 // reserved by thread stacks. 3308 assert(actual_reserve_size != 0, "Must have a stack"); 3309 3310 // Calculate the thread limit when we should start doing Virtual Memory 3311 // banging. Currently when the threads will have used all but 200Mb of space. 3312 // 3313 // TODO: consider performing a similar calculation for commit size instead 3314 // as reserve size, since on a 64-bit platform we'll run into that more 3315 // often than running out of virtual memory space. We can use the 3316 // lower value of the two calculations as the os_thread_limit. 3317 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 3318 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 3319 3320 // at exit methods are called in the reverse order of their registration. 3321 // there is no limit to the number of functions registered. atexit does 3322 // not set errno. 3323 3324 if (PerfAllowAtExitRegistration) { 3325 // only register atexit functions if PerfAllowAtExitRegistration is set. 3326 // atexit functions can be delayed until process exit time, which 3327 // can be problematic for embedded VM situations. Embedded VMs should 3328 // call DestroyJavaVM() to assure that VM resources are released. 3329 3330 // note: perfMemory_exit_helper atexit function may be removed in 3331 // the future if the appropriate cleanup code can be added to the 3332 // VM_Exit VMOperation's doit method. 3333 if (atexit(perfMemory_exit_helper) != 0) { 3334 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3335 } 3336 } 3337 3338 // initialize PSAPI or ToolHelp for fatal error handler 3339 if (win32::is_nt()) _init_psapi(); 3340 else _init_toolhelp(); 3341 3342#ifndef _WIN64 3343 // Print something if NX is enabled (win32 on AMD64) 3344 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 3345#endif 3346 3347 // initialize thread priority policy 3348 prio_init(); 3349 3350 if (UseNUMA && !ForceNUMA) { 3351 UseNUMA = false; // Currently unsupported. 3352 } 3353 3354 return JNI_OK; 3355} 3356 3357 3358// Mark the polling page as unreadable 3359void os::make_polling_page_unreadable(void) { 3360 DWORD old_status; 3361 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) ) 3362 fatal("Could not disable polling page"); 3363}; 3364 3365// Mark the polling page as readable 3366void os::make_polling_page_readable(void) { 3367 DWORD old_status; 3368 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) ) 3369 fatal("Could not enable polling page"); 3370}; 3371 3372 3373int os::stat(const char *path, struct stat *sbuf) { 3374 char pathbuf[MAX_PATH]; 3375 if (strlen(path) > MAX_PATH - 1) { 3376 errno = ENAMETOOLONG; 3377 return -1; 3378 } 3379 hpi::native_path(strcpy(pathbuf, path)); 3380 int ret = ::stat(pathbuf, sbuf); 3381 if (sbuf != NULL && UseUTCFileTimestamp) { 3382 // Fix for 6539723. st_mtime returned from stat() is dependent on 3383 // the system timezone and so can return different values for the 3384 // same file if/when daylight savings time changes. This adjustment 3385 // makes sure the same timestamp is returned regardless of the TZ. 3386 // 3387 // See: 3388 // http://msdn.microsoft.com/library/ 3389 // default.asp?url=/library/en-us/sysinfo/base/ 3390 // time_zone_information_str.asp 3391 // and 3392 // http://msdn.microsoft.com/library/default.asp?url= 3393 // /library/en-us/sysinfo/base/settimezoneinformation.asp 3394 // 3395 // NOTE: there is a insidious bug here: If the timezone is changed 3396 // after the call to stat() but before 'GetTimeZoneInformation()', then 3397 // the adjustment we do here will be wrong and we'll return the wrong 3398 // value (which will likely end up creating an invalid class data 3399 // archive). Absent a better API for this, or some time zone locking 3400 // mechanism, we'll have to live with this risk. 3401 TIME_ZONE_INFORMATION tz; 3402 DWORD tzid = GetTimeZoneInformation(&tz); 3403 int daylightBias = 3404 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 3405 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 3406 } 3407 return ret; 3408} 3409 3410 3411#define FT2INT64(ft) \ 3412 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 3413 3414 3415// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3416// are used by JVM M&M and JVMTI to get user+sys or user CPU time 3417// of a thread. 3418// 3419// current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3420// the fast estimate available on the platform. 3421 3422// current_thread_cpu_time() is not optimized for Windows yet 3423jlong os::current_thread_cpu_time() { 3424 // return user + sys since the cost is the same 3425 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 3426} 3427 3428jlong os::thread_cpu_time(Thread* thread) { 3429 // consistent with what current_thread_cpu_time() returns. 3430 return os::thread_cpu_time(thread, true /* user+sys */); 3431} 3432 3433jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3434 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3435} 3436 3437jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 3438 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 3439 // If this function changes, os::is_thread_cpu_time_supported() should too 3440 if (os::win32::is_nt()) { 3441 FILETIME CreationTime; 3442 FILETIME ExitTime; 3443 FILETIME KernelTime; 3444 FILETIME UserTime; 3445 3446 if ( GetThreadTimes(thread->osthread()->thread_handle(), 3447 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 3448 return -1; 3449 else 3450 if (user_sys_cpu_time) { 3451 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 3452 } else { 3453 return FT2INT64(UserTime) * 100; 3454 } 3455 } else { 3456 return (jlong) timeGetTime() * 1000000; 3457 } 3458} 3459 3460void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3461 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 3462 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 3463 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 3464 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3465} 3466 3467void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3468 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 3469 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 3470 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 3471 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3472} 3473 3474bool os::is_thread_cpu_time_supported() { 3475 // see os::thread_cpu_time 3476 if (os::win32::is_nt()) { 3477 FILETIME CreationTime; 3478 FILETIME ExitTime; 3479 FILETIME KernelTime; 3480 FILETIME UserTime; 3481 3482 if ( GetThreadTimes(GetCurrentThread(), 3483 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 3484 return false; 3485 else 3486 return true; 3487 } else { 3488 return false; 3489 } 3490} 3491 3492// Windows does't provide a loadavg primitive so this is stubbed out for now. 3493// It does have primitives (PDH API) to get CPU usage and run queue length. 3494// "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 3495// If we wanted to implement loadavg on Windows, we have a few options: 3496// 3497// a) Query CPU usage and run queue length and "fake" an answer by 3498// returning the CPU usage if it's under 100%, and the run queue 3499// length otherwise. It turns out that querying is pretty slow 3500// on Windows, on the order of 200 microseconds on a fast machine. 3501// Note that on the Windows the CPU usage value is the % usage 3502// since the last time the API was called (and the first call 3503// returns 100%), so we'd have to deal with that as well. 3504// 3505// b) Sample the "fake" answer using a sampling thread and store 3506// the answer in a global variable. The call to loadavg would 3507// just return the value of the global, avoiding the slow query. 3508// 3509// c) Sample a better answer using exponential decay to smooth the 3510// value. This is basically the algorithm used by UNIX kernels. 3511// 3512// Note that sampling thread starvation could affect both (b) and (c). 3513int os::loadavg(double loadavg[], int nelem) { 3514 return -1; 3515} 3516 3517 3518// DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 3519bool os::dont_yield() { 3520 return DontYieldALot; 3521} 3522 3523// Is a (classpath) directory empty? 3524bool os::dir_is_empty(const char* path) { 3525 WIN32_FIND_DATA fd; 3526 HANDLE f = FindFirstFile(path, &fd); 3527 if (f == INVALID_HANDLE_VALUE) { 3528 return true; 3529 } 3530 FindClose(f); 3531 return false; 3532} 3533 3534// create binary file, rewriting existing file if required 3535int os::create_binary_file(const char* path, bool rewrite_existing) { 3536 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 3537 if (!rewrite_existing) { 3538 oflags |= _O_EXCL; 3539 } 3540 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 3541} 3542 3543// return current position of file pointer 3544jlong os::current_file_offset(int fd) { 3545 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 3546} 3547 3548// move file pointer to the specified offset 3549jlong os::seek_to_file_offset(int fd, jlong offset) { 3550 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 3551} 3552 3553 3554// Map a block of memory. 3555char* os::map_memory(int fd, const char* file_name, size_t file_offset, 3556 char *addr, size_t bytes, bool read_only, 3557 bool allow_exec) { 3558 HANDLE hFile; 3559 char* base; 3560 3561 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 3562 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 3563 if (hFile == NULL) { 3564 if (PrintMiscellaneous && Verbose) { 3565 DWORD err = GetLastError(); 3566 tty->print_cr("CreateFile() failed: GetLastError->%ld."); 3567 } 3568 return NULL; 3569 } 3570 3571 if (allow_exec) { 3572 // CreateFileMapping/MapViewOfFileEx can't map executable memory 3573 // unless it comes from a PE image (which the shared archive is not.) 3574 // Even VirtualProtect refuses to give execute access to mapped memory 3575 // that was not previously executable. 3576 // 3577 // Instead, stick the executable region in anonymous memory. Yuck. 3578 // Penalty is that ~4 pages will not be shareable - in the future 3579 // we might consider DLLizing the shared archive with a proper PE 3580 // header so that mapping executable + sharing is possible. 3581 3582 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 3583 PAGE_READWRITE); 3584 if (base == NULL) { 3585 if (PrintMiscellaneous && Verbose) { 3586 DWORD err = GetLastError(); 3587 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 3588 } 3589 CloseHandle(hFile); 3590 return NULL; 3591 } 3592 3593 DWORD bytes_read; 3594 OVERLAPPED overlapped; 3595 overlapped.Offset = (DWORD)file_offset; 3596 overlapped.OffsetHigh = 0; 3597 overlapped.hEvent = NULL; 3598 // ReadFile guarantees that if the return value is true, the requested 3599 // number of bytes were read before returning. 3600 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 3601 if (!res) { 3602 if (PrintMiscellaneous && Verbose) { 3603 DWORD err = GetLastError(); 3604 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 3605 } 3606 release_memory(base, bytes); 3607 CloseHandle(hFile); 3608 return NULL; 3609 } 3610 } else { 3611 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 3612 NULL /*file_name*/); 3613 if (hMap == NULL) { 3614 if (PrintMiscellaneous && Verbose) { 3615 DWORD err = GetLastError(); 3616 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld."); 3617 } 3618 CloseHandle(hFile); 3619 return NULL; 3620 } 3621 3622 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 3623 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 3624 (DWORD)bytes, addr); 3625 if (base == NULL) { 3626 if (PrintMiscellaneous && Verbose) { 3627 DWORD err = GetLastError(); 3628 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 3629 } 3630 CloseHandle(hMap); 3631 CloseHandle(hFile); 3632 return NULL; 3633 } 3634 3635 if (CloseHandle(hMap) == 0) { 3636 if (PrintMiscellaneous && Verbose) { 3637 DWORD err = GetLastError(); 3638 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 3639 } 3640 CloseHandle(hFile); 3641 return base; 3642 } 3643 } 3644 3645 if (allow_exec) { 3646 DWORD old_protect; 3647 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 3648 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 3649 3650 if (!res) { 3651 if (PrintMiscellaneous && Verbose) { 3652 DWORD err = GetLastError(); 3653 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 3654 } 3655 // Don't consider this a hard error, on IA32 even if the 3656 // VirtualProtect fails, we should still be able to execute 3657 CloseHandle(hFile); 3658 return base; 3659 } 3660 } 3661 3662 if (CloseHandle(hFile) == 0) { 3663 if (PrintMiscellaneous && Verbose) { 3664 DWORD err = GetLastError(); 3665 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 3666 } 3667 return base; 3668 } 3669 3670 return base; 3671} 3672 3673 3674// Remap a block of memory. 3675char* os::remap_memory(int fd, const char* file_name, size_t file_offset, 3676 char *addr, size_t bytes, bool read_only, 3677 bool allow_exec) { 3678 // This OS does not allow existing memory maps to be remapped so we 3679 // have to unmap the memory before we remap it. 3680 if (!os::unmap_memory(addr, bytes)) { 3681 return NULL; 3682 } 3683 3684 // There is a very small theoretical window between the unmap_memory() 3685 // call above and the map_memory() call below where a thread in native 3686 // code may be able to access an address that is no longer mapped. 3687 3688 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3689 allow_exec); 3690} 3691 3692 3693// Unmap a block of memory. 3694// Returns true=success, otherwise false. 3695 3696bool os::unmap_memory(char* addr, size_t bytes) { 3697 BOOL result = UnmapViewOfFile(addr); 3698 if (result == 0) { 3699 if (PrintMiscellaneous && Verbose) { 3700 DWORD err = GetLastError(); 3701 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 3702 } 3703 return false; 3704 } 3705 return true; 3706} 3707 3708void os::pause() { 3709 char filename[MAX_PATH]; 3710 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 3711 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 3712 } else { 3713 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 3714 } 3715 3716 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 3717 if (fd != -1) { 3718 struct stat buf; 3719 close(fd); 3720 while (::stat(filename, &buf) == 0) { 3721 Sleep(100); 3722 } 3723 } else { 3724 jio_fprintf(stderr, 3725 "Could not open pause file '%s', continuing immediately.\n", filename); 3726 } 3727} 3728 3729// An Event wraps a win32 "CreateEvent" kernel handle. 3730// 3731// We have a number of choices regarding "CreateEvent" win32 handle leakage: 3732// 3733// 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 3734// field, and call CloseHandle() on the win32 event handle. Unpark() would 3735// need to be modified to tolerate finding a NULL (invalid) win32 event handle. 3736// In addition, an unpark() operation might fetch the handle field, but the 3737// event could recycle between the fetch and the SetEvent() operation. 3738// SetEvent() would either fail because the handle was invalid, or inadvertently work, 3739// as the win32 handle value had been recycled. In an ideal world calling SetEvent() 3740// on an stale but recycled handle would be harmless, but in practice this might 3741// confuse other non-Sun code, so it's not a viable approach. 3742// 3743// 2: Once a win32 event handle is associated with an Event, it remains associated 3744// with the Event. The event handle is never closed. This could be construed 3745// as handle leakage, but only up to the maximum # of threads that have been extant 3746// at any one time. This shouldn't be an issue, as windows platforms typically 3747// permit a process to have hundreds of thousands of open handles. 3748// 3749// 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 3750// and release unused handles. 3751// 3752// 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 3753// It's not clear, however, that we wouldn't be trading one type of leak for another. 3754// 3755// 5. Use an RCU-like mechanism (Read-Copy Update). 3756// Or perhaps something similar to Maged Michael's "Hazard pointers". 3757// 3758// We use (2). 3759// 3760// TODO-FIXME: 3761// 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 3762// 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 3763// to recover from (or at least detect) the dreaded Windows 841176 bug. 3764// 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 3765// into a single win32 CreateEvent() handle. 3766// 3767// _Event transitions in park() 3768// -1 => -1 : illegal 3769// 1 => 0 : pass - return immediately 3770// 0 => -1 : block 3771// 3772// _Event serves as a restricted-range semaphore : 3773// -1 : thread is blocked 3774// 0 : neutral - thread is running or ready 3775// 1 : signaled - thread is running or ready 3776// 3777// Another possible encoding of _Event would be 3778// with explicit "PARKED" and "SIGNALED" bits. 3779 3780int os::PlatformEvent::park (jlong Millis) { 3781 guarantee (_ParkHandle != NULL , "Invariant") ; 3782 guarantee (Millis > 0 , "Invariant") ; 3783 int v ; 3784 3785 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 3786 // the initial park() operation. 3787 3788 for (;;) { 3789 v = _Event ; 3790 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 3791 } 3792 guarantee ((v == 0) || (v == 1), "invariant") ; 3793 if (v != 0) return OS_OK ; 3794 3795 // Do this the hard way by blocking ... 3796 // TODO: consider a brief spin here, gated on the success of recent 3797 // spin attempts by this thread. 3798 // 3799 // We decompose long timeouts into series of shorter timed waits. 3800 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 3801 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 3802 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 3803 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 3804 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 3805 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 3806 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 3807 // for the already waited time. This policy does not admit any new outcomes. 3808 // In the future, however, we might want to track the accumulated wait time and 3809 // adjust Millis accordingly if we encounter a spurious wakeup. 3810 3811 const int MAXTIMEOUT = 0x10000000 ; 3812 DWORD rv = WAIT_TIMEOUT ; 3813 while (_Event < 0 && Millis > 0) { 3814 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT) 3815 if (Millis > MAXTIMEOUT) { 3816 prd = MAXTIMEOUT ; 3817 } 3818 rv = ::WaitForSingleObject (_ParkHandle, prd) ; 3819 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ; 3820 if (rv == WAIT_TIMEOUT) { 3821 Millis -= prd ; 3822 } 3823 } 3824 v = _Event ; 3825 _Event = 0 ; 3826 OrderAccess::fence() ; 3827 // If we encounter a nearly simultanous timeout expiry and unpark() 3828 // we return OS_OK indicating we awoke via unpark(). 3829 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 3830 return (v >= 0) ? OS_OK : OS_TIMEOUT ; 3831} 3832 3833void os::PlatformEvent::park () { 3834 guarantee (_ParkHandle != NULL, "Invariant") ; 3835 // Invariant: Only the thread associated with the Event/PlatformEvent 3836 // may call park(). 3837 int v ; 3838 for (;;) { 3839 v = _Event ; 3840 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 3841 } 3842 guarantee ((v == 0) || (v == 1), "invariant") ; 3843 if (v != 0) return ; 3844 3845 // Do this the hard way by blocking ... 3846 // TODO: consider a brief spin here, gated on the success of recent 3847 // spin attempts by this thread. 3848 while (_Event < 0) { 3849 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ; 3850 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ; 3851 } 3852 3853 // Usually we'll find _Event == 0 at this point, but as 3854 // an optional optimization we clear it, just in case can 3855 // multiple unpark() operations drove _Event up to 1. 3856 _Event = 0 ; 3857 OrderAccess::fence() ; 3858 guarantee (_Event >= 0, "invariant") ; 3859} 3860 3861void os::PlatformEvent::unpark() { 3862 guarantee (_ParkHandle != NULL, "Invariant") ; 3863 int v ; 3864 for (;;) { 3865 v = _Event ; // Increment _Event if it's < 1. 3866 if (v > 0) { 3867 // If it's already signaled just return. 3868 // The LD of _Event could have reordered or be satisfied 3869 // by a read-aside from this processor's write buffer. 3870 // To avoid problems execute a barrier and then 3871 // ratify the value. A degenerate CAS() would also work. 3872 // Viz., CAS (v+0, &_Event, v) == v). 3873 OrderAccess::fence() ; 3874 if (_Event == v) return ; 3875 continue ; 3876 } 3877 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; 3878 } 3879 if (v < 0) { 3880 ::SetEvent (_ParkHandle) ; 3881 } 3882} 3883 3884 3885// JSR166 3886// ------------------------------------------------------- 3887 3888/* 3889 * The Windows implementation of Park is very straightforward: Basic 3890 * operations on Win32 Events turn out to have the right semantics to 3891 * use them directly. We opportunistically resuse the event inherited 3892 * from Monitor. 3893 */ 3894 3895 3896void Parker::park(bool isAbsolute, jlong time) { 3897 guarantee (_ParkEvent != NULL, "invariant") ; 3898 // First, demultiplex/decode time arguments 3899 if (time < 0) { // don't wait 3900 return; 3901 } 3902 else if (time == 0) { 3903 time = INFINITE; 3904 } 3905 else if (isAbsolute) { 3906 time -= os::javaTimeMillis(); // convert to relative time 3907 if (time <= 0) // already elapsed 3908 return; 3909 } 3910 else { // relative 3911 time /= 1000000; // Must coarsen from nanos to millis 3912 if (time == 0) // Wait for the minimal time unit if zero 3913 time = 1; 3914 } 3915 3916 JavaThread* thread = (JavaThread*)(Thread::current()); 3917 assert(thread->is_Java_thread(), "Must be JavaThread"); 3918 JavaThread *jt = (JavaThread *)thread; 3919 3920 // Don't wait if interrupted or already triggered 3921 if (Thread::is_interrupted(thread, false) || 3922 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 3923 ResetEvent(_ParkEvent); 3924 return; 3925 } 3926 else { 3927 ThreadBlockInVM tbivm(jt); 3928 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 3929 jt->set_suspend_equivalent(); 3930 3931 WaitForSingleObject(_ParkEvent, time); 3932 ResetEvent(_ParkEvent); 3933 3934 // If externally suspended while waiting, re-suspend 3935 if (jt->handle_special_suspend_equivalent_condition()) { 3936 jt->java_suspend_self(); 3937 } 3938 } 3939} 3940 3941void Parker::unpark() { 3942 guarantee (_ParkEvent != NULL, "invariant") ; 3943 SetEvent(_ParkEvent); 3944} 3945 3946// Run the specified command in a separate process. Return its exit value, 3947// or -1 on failure (e.g. can't create a new process). 3948int os::fork_and_exec(char* cmd) { 3949 STARTUPINFO si; 3950 PROCESS_INFORMATION pi; 3951 3952 memset(&si, 0, sizeof(si)); 3953 si.cb = sizeof(si); 3954 memset(&pi, 0, sizeof(pi)); 3955 BOOL rslt = CreateProcess(NULL, // executable name - use command line 3956 cmd, // command line 3957 NULL, // process security attribute 3958 NULL, // thread security attribute 3959 TRUE, // inherits system handles 3960 0, // no creation flags 3961 NULL, // use parent's environment block 3962 NULL, // use parent's starting directory 3963 &si, // (in) startup information 3964 &pi); // (out) process information 3965 3966 if (rslt) { 3967 // Wait until child process exits. 3968 WaitForSingleObject(pi.hProcess, INFINITE); 3969 3970 DWORD exit_code; 3971 GetExitCodeProcess(pi.hProcess, &exit_code); 3972 3973 // Close process and thread handles. 3974 CloseHandle(pi.hProcess); 3975 CloseHandle(pi.hThread); 3976 3977 return (int)exit_code; 3978 } else { 3979 return -1; 3980 } 3981} 3982 3983//-------------------------------------------------------------------------------------------------- 3984// Non-product code 3985 3986static int mallocDebugIntervalCounter = 0; 3987static int mallocDebugCounter = 0; 3988bool os::check_heap(bool force) { 3989 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 3990 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 3991 // Note: HeapValidate executes two hardware breakpoints when it finds something 3992 // wrong; at these points, eax contains the address of the offending block (I think). 3993 // To get to the exlicit error message(s) below, just continue twice. 3994 HANDLE heap = GetProcessHeap(); 3995 { HeapLock(heap); 3996 PROCESS_HEAP_ENTRY phe; 3997 phe.lpData = NULL; 3998 while (HeapWalk(heap, &phe) != 0) { 3999 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 4000 !HeapValidate(heap, 0, phe.lpData)) { 4001 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 4002 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 4003 fatal("corrupted C heap"); 4004 } 4005 } 4006 int err = GetLastError(); 4007 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 4008 fatal1("heap walk aborted with error %d", err); 4009 } 4010 HeapUnlock(heap); 4011 } 4012 mallocDebugIntervalCounter = 0; 4013 } 4014 return true; 4015} 4016 4017 4018#ifndef PRODUCT 4019bool os::find(address addr) { 4020 // Nothing yet 4021 return false; 4022} 4023#endif 4024 4025LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 4026 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 4027 4028 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { 4029 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow(); 4030 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 4031 address addr = (address) exceptionRecord->ExceptionInformation[1]; 4032 4033 if (os::is_memory_serialize_page(thread, addr)) 4034 return EXCEPTION_CONTINUE_EXECUTION; 4035 } 4036 4037 return EXCEPTION_CONTINUE_SEARCH; 4038} 4039 4040static int getLastErrorString(char *buf, size_t len) 4041{ 4042 long errval; 4043 4044 if ((errval = GetLastError()) != 0) 4045 { 4046 /* DOS error */ 4047 size_t n = (size_t)FormatMessage( 4048 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 4049 NULL, 4050 errval, 4051 0, 4052 buf, 4053 (DWORD)len, 4054 NULL); 4055 if (n > 3) { 4056 /* Drop final '.', CR, LF */ 4057 if (buf[n - 1] == '\n') n--; 4058 if (buf[n - 1] == '\r') n--; 4059 if (buf[n - 1] == '.') n--; 4060 buf[n] = '\0'; 4061 } 4062 return (int)n; 4063 } 4064 4065 if (errno != 0) 4066 { 4067 /* C runtime error that has no corresponding DOS error code */ 4068 const char *s = strerror(errno); 4069 size_t n = strlen(s); 4070 if (n >= len) n = len - 1; 4071 strncpy(buf, s, n); 4072 buf[n] = '\0'; 4073 return (int)n; 4074 } 4075 return 0; 4076} 4077