os_windows.cpp revision 79:82db0859acbe
1245512Sdelphij/* 2245512Sdelphij * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved. 3245512Sdelphij * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4245512Sdelphij * 5245512Sdelphij * This code is free software; you can redistribute it and/or modify it 6245512Sdelphij * under the terms of the GNU General Public License version 2 only, as 7245512Sdelphij * published by the Free Software Foundation. 8245512Sdelphij * 9245512Sdelphij * This code is distributed in the hope that it will be useful, but WITHOUT 10245512Sdelphij * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11245512Sdelphij * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12245512Sdelphij * version 2 for more details (a copy is included in the LICENSE file that 13245512Sdelphij * accompanied this code). 14245512Sdelphij * 15245512Sdelphij * You should have received a copy of the GNU General Public License version 16245512Sdelphij * 2 along with this work; if not, write to the Free Software Foundation, 17245512Sdelphij * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18245512Sdelphij * 19245512Sdelphij * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20245512Sdelphij * CA 95054 USA or visit www.sun.com if you need additional information or 21245512Sdelphij * have any questions. 22245512Sdelphij * 23245512Sdelphij */ 24245512Sdelphij 25245512Sdelphij#ifdef _WIN64 26245512Sdelphij// Must be at least Windows 2000 or XP to use VectoredExceptions 27245512Sdelphij#define _WIN32_WINNT 0x500 28245512Sdelphij#endif 29245512Sdelphij 30245512Sdelphij// do not include precompiled header file 31# include "incls/_os_windows.cpp.incl" 32 33#ifdef _DEBUG 34#include <crtdbg.h> 35#endif 36 37 38#include <windows.h> 39#include <sys/types.h> 40#include <sys/stat.h> 41#include <sys/timeb.h> 42#include <objidl.h> 43#include <shlobj.h> 44 45#include <malloc.h> 46#include <signal.h> 47#include <direct.h> 48#include <errno.h> 49#include <fcntl.h> 50#include <io.h> 51#include <process.h> // For _beginthreadex(), _endthreadex() 52#include <imagehlp.h> // For os::dll_address_to_function_name 53 54/* for enumerating dll libraries */ 55#include <tlhelp32.h> 56#include <vdmdbg.h> 57 58// for timer info max values which include all bits 59#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 60 61// For DLL loading/load error detection 62// Values of PE COFF 63#define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c 64#define IMAGE_FILE_SIGNATURE_LENGTH 4 65 66static HANDLE main_process; 67static HANDLE main_thread; 68static int main_thread_id; 69 70static FILETIME process_creation_time; 71static FILETIME process_exit_time; 72static FILETIME process_user_time; 73static FILETIME process_kernel_time; 74 75#ifdef _WIN64 76PVOID topLevelVectoredExceptionHandler = NULL; 77#endif 78 79#ifdef _M_IA64 80#define __CPU__ ia64 81#elif _M_AMD64 82#define __CPU__ amd64 83#else 84#define __CPU__ i486 85#endif 86 87// save DLL module handle, used by GetModuleFileName 88 89HINSTANCE vm_lib_handle; 90static int getLastErrorString(char *buf, size_t len); 91 92BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { 93 switch (reason) { 94 case DLL_PROCESS_ATTACH: 95 vm_lib_handle = hinst; 96 if(ForceTimeHighResolution) 97 timeBeginPeriod(1L); 98 break; 99 case DLL_PROCESS_DETACH: 100 if(ForceTimeHighResolution) 101 timeEndPeriod(1L); 102#ifdef _WIN64 103 if (topLevelVectoredExceptionHandler != NULL) { 104 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler); 105 topLevelVectoredExceptionHandler = NULL; 106 } 107#endif 108 break; 109 default: 110 break; 111 } 112 return true; 113} 114 115static inline double fileTimeAsDouble(FILETIME* time) { 116 const double high = (double) ((unsigned int) ~0); 117 const double split = 10000000.0; 118 double result = (time->dwLowDateTime / split) + 119 time->dwHighDateTime * (high/split); 120 return result; 121} 122 123// Implementation of os 124 125bool os::getenv(const char* name, char* buffer, int len) { 126 int result = GetEnvironmentVariable(name, buffer, len); 127 return result > 0 && result < len; 128} 129 130 131// No setuid programs under Windows. 132bool os::have_special_privileges() { 133 return false; 134} 135 136 137// This method is a periodic task to check for misbehaving JNI applications 138// under CheckJNI, we can add any periodic checks here. 139// For Windows at the moment does nothing 140void os::run_periodic_checks() { 141 return; 142} 143 144#ifndef _WIN64 145LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 146#endif 147void os::init_system_properties_values() { 148 /* sysclasspath, java_home, dll_dir */ 149 { 150 char *home_path; 151 char *dll_path; 152 char *pslash; 153 char *bin = "\\bin"; 154 char home_dir[MAX_PATH]; 155 156 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) { 157 os::jvm_path(home_dir, sizeof(home_dir)); 158 // Found the full path to jvm[_g].dll. 159 // Now cut the path to <java_home>/jre if we can. 160 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */ 161 pslash = strrchr(home_dir, '\\'); 162 if (pslash != NULL) { 163 *pslash = '\0'; /* get rid of \{client|server} */ 164 pslash = strrchr(home_dir, '\\'); 165 if (pslash != NULL) 166 *pslash = '\0'; /* get rid of \bin */ 167 } 168 } 169 170 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1); 171 if (home_path == NULL) 172 return; 173 strcpy(home_path, home_dir); 174 Arguments::set_java_home(home_path); 175 176 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1); 177 if (dll_path == NULL) 178 return; 179 strcpy(dll_path, home_dir); 180 strcat(dll_path, bin); 181 Arguments::set_dll_dir(dll_path); 182 183 if (!set_boot_path('\\', ';')) 184 return; 185 } 186 187 /* library_path */ 188 #define EXT_DIR "\\lib\\ext" 189 #define BIN_DIR "\\bin" 190 #define PACKAGE_DIR "\\Sun\\Java" 191 { 192 /* Win32 library search order (See the documentation for LoadLibrary): 193 * 194 * 1. The directory from which application is loaded. 195 * 2. The current directory 196 * 3. The system wide Java Extensions directory (Java only) 197 * 4. System directory (GetSystemDirectory) 198 * 5. Windows directory (GetWindowsDirectory) 199 * 6. The PATH environment variable 200 */ 201 202 char *library_path; 203 char tmp[MAX_PATH]; 204 char *path_str = ::getenv("PATH"); 205 206 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 207 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10); 208 209 library_path[0] = '\0'; 210 211 GetModuleFileName(NULL, tmp, sizeof(tmp)); 212 *(strrchr(tmp, '\\')) = '\0'; 213 strcat(library_path, tmp); 214 215 strcat(library_path, ";."); 216 217 GetWindowsDirectory(tmp, sizeof(tmp)); 218 strcat(library_path, ";"); 219 strcat(library_path, tmp); 220 strcat(library_path, PACKAGE_DIR BIN_DIR); 221 222 GetSystemDirectory(tmp, sizeof(tmp)); 223 strcat(library_path, ";"); 224 strcat(library_path, tmp); 225 226 GetWindowsDirectory(tmp, sizeof(tmp)); 227 strcat(library_path, ";"); 228 strcat(library_path, tmp); 229 230 if (path_str) { 231 strcat(library_path, ";"); 232 strcat(library_path, path_str); 233 } 234 235 Arguments::set_library_path(library_path); 236 FREE_C_HEAP_ARRAY(char, library_path); 237 } 238 239 /* Default extensions directory */ 240 { 241 char path[MAX_PATH]; 242 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 243 GetWindowsDirectory(path, MAX_PATH); 244 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 245 path, PACKAGE_DIR, EXT_DIR); 246 Arguments::set_ext_dirs(buf); 247 } 248 #undef EXT_DIR 249 #undef BIN_DIR 250 #undef PACKAGE_DIR 251 252 /* Default endorsed standards directory. */ 253 { 254 #define ENDORSED_DIR "\\lib\\endorsed" 255 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR); 256 char * buf = NEW_C_HEAP_ARRAY(char, len); 257 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR); 258 Arguments::set_endorsed_dirs(buf); 259 #undef ENDORSED_DIR 260 } 261 262#ifndef _WIN64 263 SetUnhandledExceptionFilter(Handle_FLT_Exception); 264#endif 265 266 // Done 267 return; 268} 269 270void os::breakpoint() { 271 DebugBreak(); 272} 273 274// Invoked from the BREAKPOINT Macro 275extern "C" void breakpoint() { 276 os::breakpoint(); 277} 278 279// Returns an estimate of the current stack pointer. Result must be guaranteed 280// to point into the calling threads stack, and be no lower than the current 281// stack pointer. 282 283address os::current_stack_pointer() { 284 int dummy; 285 address sp = (address)&dummy; 286 return sp; 287} 288 289// os::current_stack_base() 290// 291// Returns the base of the stack, which is the stack's 292// starting address. This function must be called 293// while running on the stack of the thread being queried. 294 295address os::current_stack_base() { 296 MEMORY_BASIC_INFORMATION minfo; 297 address stack_bottom; 298 size_t stack_size; 299 300 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 301 stack_bottom = (address)minfo.AllocationBase; 302 stack_size = minfo.RegionSize; 303 304 // Add up the sizes of all the regions with the same 305 // AllocationBase. 306 while( 1 ) 307 { 308 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 309 if ( stack_bottom == (address)minfo.AllocationBase ) 310 stack_size += minfo.RegionSize; 311 else 312 break; 313 } 314 315#ifdef _M_IA64 316 // IA64 has memory and register stacks 317 stack_size = stack_size / 2; 318#endif 319 return stack_bottom + stack_size; 320} 321 322size_t os::current_stack_size() { 323 size_t sz; 324 MEMORY_BASIC_INFORMATION minfo; 325 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 326 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 327 return sz; 328} 329 330 331LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 332 333// Thread start routine for all new Java threads 334static unsigned __stdcall java_start(Thread* thread) { 335 // Try to randomize the cache line index of hot stack frames. 336 // This helps when threads of the same stack traces evict each other's 337 // cache lines. The threads can be either from the same JVM instance, or 338 // from different JVM instances. The benefit is especially true for 339 // processors with hyperthreading technology. 340 static int counter = 0; 341 int pid = os::current_process_id(); 342 _alloca(((pid ^ counter++) & 7) * 128); 343 344 OSThread* osthr = thread->osthread(); 345 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 346 347 if (UseNUMA) { 348 int lgrp_id = os::numa_get_group_id(); 349 if (lgrp_id != -1) { 350 thread->set_lgrp_id(lgrp_id); 351 } 352 } 353 354 355 if (UseVectoredExceptions) { 356 // If we are using vectored exception we don't need to set a SEH 357 thread->run(); 358 } 359 else { 360 // Install a win32 structured exception handler around every thread created 361 // by VM, so VM can genrate error dump when an exception occurred in non- 362 // Java thread (e.g. VM thread). 363 __try { 364 thread->run(); 365 } __except(topLevelExceptionFilter( 366 (_EXCEPTION_POINTERS*)_exception_info())) { 367 // Nothing to do. 368 } 369 } 370 371 // One less thread is executing 372 // When the VMThread gets here, the main thread may have already exited 373 // which frees the CodeHeap containing the Atomic::add code 374 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 375 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); 376 } 377 378 return 0; 379} 380 381static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) { 382 // Allocate the OSThread object 383 OSThread* osthread = new OSThread(NULL, NULL); 384 if (osthread == NULL) return NULL; 385 386 // Initialize support for Java interrupts 387 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 388 if (interrupt_event == NULL) { 389 delete osthread; 390 return NULL; 391 } 392 osthread->set_interrupt_event(interrupt_event); 393 394 // Store info on the Win32 thread into the OSThread 395 osthread->set_thread_handle(thread_handle); 396 osthread->set_thread_id(thread_id); 397 398 if (UseNUMA) { 399 int lgrp_id = os::numa_get_group_id(); 400 if (lgrp_id != -1) { 401 thread->set_lgrp_id(lgrp_id); 402 } 403 } 404 405 // Initial thread state is INITIALIZED, not SUSPENDED 406 osthread->set_state(INITIALIZED); 407 408 return osthread; 409} 410 411 412bool os::create_attached_thread(JavaThread* thread) { 413#ifdef ASSERT 414 thread->verify_not_published(); 415#endif 416 HANDLE thread_h; 417 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 418 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 419 fatal("DuplicateHandle failed\n"); 420 } 421 OSThread* osthread = create_os_thread(thread, thread_h, 422 (int)current_thread_id()); 423 if (osthread == NULL) { 424 return false; 425 } 426 427 // Initial thread state is RUNNABLE 428 osthread->set_state(RUNNABLE); 429 430 thread->set_osthread(osthread); 431 return true; 432} 433 434bool os::create_main_thread(JavaThread* thread) { 435#ifdef ASSERT 436 thread->verify_not_published(); 437#endif 438 if (_starting_thread == NULL) { 439 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 440 if (_starting_thread == NULL) { 441 return false; 442 } 443 } 444 445 // The primordial thread is runnable from the start) 446 _starting_thread->set_state(RUNNABLE); 447 448 thread->set_osthread(_starting_thread); 449 return true; 450} 451 452// Allocate and initialize a new OSThread 453bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 454 unsigned thread_id; 455 456 // Allocate the OSThread object 457 OSThread* osthread = new OSThread(NULL, NULL); 458 if (osthread == NULL) { 459 return false; 460 } 461 462 // Initialize support for Java interrupts 463 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 464 if (interrupt_event == NULL) { 465 delete osthread; 466 return NULL; 467 } 468 osthread->set_interrupt_event(interrupt_event); 469 osthread->set_interrupted(false); 470 471 thread->set_osthread(osthread); 472 473 if (stack_size == 0) { 474 switch (thr_type) { 475 case os::java_thread: 476 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 477 if (JavaThread::stack_size_at_create() > 0) 478 stack_size = JavaThread::stack_size_at_create(); 479 break; 480 case os::compiler_thread: 481 if (CompilerThreadStackSize > 0) { 482 stack_size = (size_t)(CompilerThreadStackSize * K); 483 break; 484 } // else fall through: 485 // use VMThreadStackSize if CompilerThreadStackSize is not defined 486 case os::vm_thread: 487 case os::pgc_thread: 488 case os::cgc_thread: 489 case os::watcher_thread: 490 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 491 break; 492 } 493 } 494 495 // Create the Win32 thread 496 // 497 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 498 // does not specify stack size. Instead, it specifies the size of 499 // initially committed space. The stack size is determined by 500 // PE header in the executable. If the committed "stack_size" is larger 501 // than default value in the PE header, the stack is rounded up to the 502 // nearest multiple of 1MB. For example if the launcher has default 503 // stack size of 320k, specifying any size less than 320k does not 504 // affect the actual stack size at all, it only affects the initial 505 // commitment. On the other hand, specifying 'stack_size' larger than 506 // default value may cause significant increase in memory usage, because 507 // not only the stack space will be rounded up to MB, but also the 508 // entire space is committed upfront. 509 // 510 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 511 // for CreateThread() that can treat 'stack_size' as stack size. However we 512 // are not supposed to call CreateThread() directly according to MSDN 513 // document because JVM uses C runtime library. The good news is that the 514 // flag appears to work with _beginthredex() as well. 515 516#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION 517#define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000) 518#endif 519 520 HANDLE thread_handle = 521 (HANDLE)_beginthreadex(NULL, 522 (unsigned)stack_size, 523 (unsigned (__stdcall *)(void*)) java_start, 524 thread, 525 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, 526 &thread_id); 527 if (thread_handle == NULL) { 528 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again 529 // without the flag. 530 thread_handle = 531 (HANDLE)_beginthreadex(NULL, 532 (unsigned)stack_size, 533 (unsigned (__stdcall *)(void*)) java_start, 534 thread, 535 CREATE_SUSPENDED, 536 &thread_id); 537 } 538 if (thread_handle == NULL) { 539 // Need to clean up stuff we've allocated so far 540 CloseHandle(osthread->interrupt_event()); 541 thread->set_osthread(NULL); 542 delete osthread; 543 return NULL; 544 } 545 546 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); 547 548 // Store info on the Win32 thread into the OSThread 549 osthread->set_thread_handle(thread_handle); 550 osthread->set_thread_id(thread_id); 551 552 // Initial thread state is INITIALIZED, not SUSPENDED 553 osthread->set_state(INITIALIZED); 554 555 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 556 return true; 557} 558 559 560// Free Win32 resources related to the OSThread 561void os::free_thread(OSThread* osthread) { 562 assert(osthread != NULL, "osthread not set"); 563 CloseHandle(osthread->thread_handle()); 564 CloseHandle(osthread->interrupt_event()); 565 delete osthread; 566} 567 568 569static int has_performance_count = 0; 570static jlong first_filetime; 571static jlong initial_performance_count; 572static jlong performance_frequency; 573 574 575jlong as_long(LARGE_INTEGER x) { 576 jlong result = 0; // initialization to avoid warning 577 set_high(&result, x.HighPart); 578 set_low(&result, x.LowPart); 579 return result; 580} 581 582 583jlong os::elapsed_counter() { 584 LARGE_INTEGER count; 585 if (has_performance_count) { 586 QueryPerformanceCounter(&count); 587 return as_long(count) - initial_performance_count; 588 } else { 589 FILETIME wt; 590 GetSystemTimeAsFileTime(&wt); 591 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime); 592 } 593} 594 595 596jlong os::elapsed_frequency() { 597 if (has_performance_count) { 598 return performance_frequency; 599 } else { 600 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601. 601 return 10000000; 602 } 603} 604 605 606julong os::available_memory() { 607 return win32::available_memory(); 608} 609 610julong os::win32::available_memory() { 611 // FIXME: GlobalMemoryStatus() may return incorrect value if total memory 612 // is larger than 4GB 613 MEMORYSTATUS ms; 614 GlobalMemoryStatus(&ms); 615 616 return (julong)ms.dwAvailPhys; 617} 618 619julong os::physical_memory() { 620 return win32::physical_memory(); 621} 622 623julong os::allocatable_physical_memory(julong size) { 624#ifdef _LP64 625 return size; 626#else 627 // Limit to 1400m because of the 2gb address space wall 628 return MIN2(size, (julong)1400*M); 629#endif 630} 631 632// VC6 lacks DWORD_PTR 633#if _MSC_VER < 1300 634typedef UINT_PTR DWORD_PTR; 635#endif 636 637int os::active_processor_count() { 638 DWORD_PTR lpProcessAffinityMask = 0; 639 DWORD_PTR lpSystemAffinityMask = 0; 640 int proc_count = processor_count(); 641 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 642 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 643 // Nof active processors is number of bits in process affinity mask 644 int bitcount = 0; 645 while (lpProcessAffinityMask != 0) { 646 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 647 bitcount++; 648 } 649 return bitcount; 650 } else { 651 return proc_count; 652 } 653} 654 655bool os::distribute_processes(uint length, uint* distribution) { 656 // Not yet implemented. 657 return false; 658} 659 660bool os::bind_to_processor(uint processor_id) { 661 // Not yet implemented. 662 return false; 663} 664 665static void initialize_performance_counter() { 666 LARGE_INTEGER count; 667 if (QueryPerformanceFrequency(&count)) { 668 has_performance_count = 1; 669 performance_frequency = as_long(count); 670 QueryPerformanceCounter(&count); 671 initial_performance_count = as_long(count); 672 } else { 673 has_performance_count = 0; 674 FILETIME wt; 675 GetSystemTimeAsFileTime(&wt); 676 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 677 } 678} 679 680 681double os::elapsedTime() { 682 return (double) elapsed_counter() / (double) elapsed_frequency(); 683} 684 685 686// Windows format: 687// The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 688// Java format: 689// Java standards require the number of milliseconds since 1/1/1970 690 691// Constant offset - calculated using offset() 692static jlong _offset = 116444736000000000; 693// Fake time counter for reproducible results when debugging 694static jlong fake_time = 0; 695 696#ifdef ASSERT 697// Just to be safe, recalculate the offset in debug mode 698static jlong _calculated_offset = 0; 699static int _has_calculated_offset = 0; 700 701jlong offset() { 702 if (_has_calculated_offset) return _calculated_offset; 703 SYSTEMTIME java_origin; 704 java_origin.wYear = 1970; 705 java_origin.wMonth = 1; 706 java_origin.wDayOfWeek = 0; // ignored 707 java_origin.wDay = 1; 708 java_origin.wHour = 0; 709 java_origin.wMinute = 0; 710 java_origin.wSecond = 0; 711 java_origin.wMilliseconds = 0; 712 FILETIME jot; 713 if (!SystemTimeToFileTime(&java_origin, &jot)) { 714 fatal1("Error = %d\nWindows error", GetLastError()); 715 } 716 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 717 _has_calculated_offset = 1; 718 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 719 return _calculated_offset; 720} 721#else 722jlong offset() { 723 return _offset; 724} 725#endif 726 727jlong windows_to_java_time(FILETIME wt) { 728 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 729 return (a - offset()) / 10000; 730} 731 732FILETIME java_to_windows_time(jlong l) { 733 jlong a = (l * 10000) + offset(); 734 FILETIME result; 735 result.dwHighDateTime = high(a); 736 result.dwLowDateTime = low(a); 737 return result; 738} 739 740jlong os::javaTimeMillis() { 741 if (UseFakeTimers) { 742 return fake_time++; 743 } else { 744 FILETIME wt; 745 GetSystemTimeAsFileTime(&wt); 746 return windows_to_java_time(wt); 747 } 748} 749 750#define NANOS_PER_SEC CONST64(1000000000) 751#define NANOS_PER_MILLISEC 1000000 752jlong os::javaTimeNanos() { 753 if (!has_performance_count) { 754 return javaTimeMillis() * NANOS_PER_MILLISEC; // the best we can do. 755 } else { 756 LARGE_INTEGER current_count; 757 QueryPerformanceCounter(¤t_count); 758 double current = as_long(current_count); 759 double freq = performance_frequency; 760 jlong time = (jlong)((current/freq) * NANOS_PER_SEC); 761 return time; 762 } 763} 764 765void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 766 if (!has_performance_count) { 767 // javaTimeMillis() doesn't have much percision, 768 // but it is not going to wrap -- so all 64 bits 769 info_ptr->max_value = ALL_64_BITS; 770 771 // this is a wall clock timer, so may skip 772 info_ptr->may_skip_backward = true; 773 info_ptr->may_skip_forward = true; 774 } else { 775 jlong freq = performance_frequency; 776 if (freq < NANOS_PER_SEC) { 777 // the performance counter is 64 bits and we will 778 // be multiplying it -- so no wrap in 64 bits 779 info_ptr->max_value = ALL_64_BITS; 780 } else if (freq > NANOS_PER_SEC) { 781 // use the max value the counter can reach to 782 // determine the max value which could be returned 783 julong max_counter = (julong)ALL_64_BITS; 784 info_ptr->max_value = (jlong)(max_counter / (freq / NANOS_PER_SEC)); 785 } else { 786 // the performance counter is 64 bits and we will 787 // be using it directly -- so no wrap in 64 bits 788 info_ptr->max_value = ALL_64_BITS; 789 } 790 791 // using a counter, so no skipping 792 info_ptr->may_skip_backward = false; 793 info_ptr->may_skip_forward = false; 794 } 795 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 796} 797 798char* os::local_time_string(char *buf, size_t buflen) { 799 SYSTEMTIME st; 800 GetLocalTime(&st); 801 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 802 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 803 return buf; 804} 805 806bool os::getTimesSecs(double* process_real_time, 807 double* process_user_time, 808 double* process_system_time) { 809 HANDLE h_process = GetCurrentProcess(); 810 FILETIME create_time, exit_time, kernel_time, user_time; 811 BOOL result = GetProcessTimes(h_process, 812 &create_time, 813 &exit_time, 814 &kernel_time, 815 &user_time); 816 if (result != 0) { 817 FILETIME wt; 818 GetSystemTimeAsFileTime(&wt); 819 jlong rtc_millis = windows_to_java_time(wt); 820 jlong user_millis = windows_to_java_time(user_time); 821 jlong system_millis = windows_to_java_time(kernel_time); 822 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 823 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); 824 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); 825 return true; 826 } else { 827 return false; 828 } 829} 830 831void os::shutdown() { 832 833 // allow PerfMemory to attempt cleanup of any persistent resources 834 perfMemory_exit(); 835 836 // flush buffered output, finish log files 837 ostream_abort(); 838 839 // Check for abort hook 840 abort_hook_t abort_hook = Arguments::abort_hook(); 841 if (abort_hook != NULL) { 842 abort_hook(); 843 } 844} 845 846void os::abort(bool dump_core) 847{ 848 os::shutdown(); 849 // no core dump on Windows 850 ::exit(1); 851} 852 853// Die immediately, no exit hook, no abort hook, no cleanup. 854void os::die() { 855 _exit(-1); 856} 857 858// Directory routines copied from src/win32/native/java/io/dirent_md.c 859// * dirent_md.c 1.15 00/02/02 860// 861// The declarations for DIR and struct dirent are in jvm_win32.h. 862 863/* Caller must have already run dirname through JVM_NativePath, which removes 864 duplicate slashes and converts all instances of '/' into '\\'. */ 865 866DIR * 867os::opendir(const char *dirname) 868{ 869 assert(dirname != NULL, "just checking"); // hotspot change 870 DIR *dirp = (DIR *)malloc(sizeof(DIR)); 871 DWORD fattr; // hotspot change 872 char alt_dirname[4] = { 0, 0, 0, 0 }; 873 874 if (dirp == 0) { 875 errno = ENOMEM; 876 return 0; 877 } 878 879 /* 880 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it 881 * as a directory in FindFirstFile(). We detect this case here and 882 * prepend the current drive name. 883 */ 884 if (dirname[1] == '\0' && dirname[0] == '\\') { 885 alt_dirname[0] = _getdrive() + 'A' - 1; 886 alt_dirname[1] = ':'; 887 alt_dirname[2] = '\\'; 888 alt_dirname[3] = '\0'; 889 dirname = alt_dirname; 890 } 891 892 dirp->path = (char *)malloc(strlen(dirname) + 5); 893 if (dirp->path == 0) { 894 free(dirp); 895 errno = ENOMEM; 896 return 0; 897 } 898 strcpy(dirp->path, dirname); 899 900 fattr = GetFileAttributes(dirp->path); 901 if (fattr == 0xffffffff) { 902 free(dirp->path); 903 free(dirp); 904 errno = ENOENT; 905 return 0; 906 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 907 free(dirp->path); 908 free(dirp); 909 errno = ENOTDIR; 910 return 0; 911 } 912 913 /* Append "*.*", or possibly "\\*.*", to path */ 914 if (dirp->path[1] == ':' 915 && (dirp->path[2] == '\0' 916 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 917 /* No '\\' needed for cases like "Z:" or "Z:\" */ 918 strcat(dirp->path, "*.*"); 919 } else { 920 strcat(dirp->path, "\\*.*"); 921 } 922 923 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 924 if (dirp->handle == INVALID_HANDLE_VALUE) { 925 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 926 free(dirp->path); 927 free(dirp); 928 errno = EACCES; 929 return 0; 930 } 931 } 932 return dirp; 933} 934 935/* parameter dbuf unused on Windows */ 936 937struct dirent * 938os::readdir(DIR *dirp, dirent *dbuf) 939{ 940 assert(dirp != NULL, "just checking"); // hotspot change 941 if (dirp->handle == INVALID_HANDLE_VALUE) { 942 return 0; 943 } 944 945 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 946 947 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 948 if (GetLastError() == ERROR_INVALID_HANDLE) { 949 errno = EBADF; 950 return 0; 951 } 952 FindClose(dirp->handle); 953 dirp->handle = INVALID_HANDLE_VALUE; 954 } 955 956 return &dirp->dirent; 957} 958 959int 960os::closedir(DIR *dirp) 961{ 962 assert(dirp != NULL, "just checking"); // hotspot change 963 if (dirp->handle != INVALID_HANDLE_VALUE) { 964 if (!FindClose(dirp->handle)) { 965 errno = EBADF; 966 return -1; 967 } 968 dirp->handle = INVALID_HANDLE_VALUE; 969 } 970 free(dirp->path); 971 free(dirp); 972 return 0; 973} 974 975const char* os::dll_file_extension() { return ".dll"; } 976 977const char * os::get_temp_directory() 978{ 979 static char path_buf[MAX_PATH]; 980 if (GetTempPath(MAX_PATH, path_buf)>0) 981 return path_buf; 982 else{ 983 path_buf[0]='\0'; 984 return path_buf; 985 } 986} 987 988// Needs to be in os specific directory because windows requires another 989// header file <direct.h> 990const char* os::get_current_directory(char *buf, int buflen) { 991 return _getcwd(buf, buflen); 992} 993 994//----------------------------------------------------------- 995// Helper functions for fatal error handler 996 997// The following library functions are resolved dynamically at runtime: 998 999// PSAPI functions, for Windows NT, 2000, XP 1000 1001// psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform 1002// SDK from Microsoft. Here are the definitions copied from psapi.h 1003typedef struct _MODULEINFO { 1004 LPVOID lpBaseOfDll; 1005 DWORD SizeOfImage; 1006 LPVOID EntryPoint; 1007} MODULEINFO, *LPMODULEINFO; 1008 1009static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD ); 1010static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD ); 1011static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD ); 1012 1013// ToolHelp Functions, for Windows 95, 98 and ME 1014 1015static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ; 1016static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ; 1017static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ; 1018 1019bool _has_psapi; 1020bool _psapi_init = false; 1021bool _has_toolhelp; 1022 1023static bool _init_psapi() { 1024 HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ; 1025 if( psapi == NULL ) return false ; 1026 1027 _EnumProcessModules = CAST_TO_FN_PTR( 1028 BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD), 1029 GetProcAddress(psapi, "EnumProcessModules")) ; 1030 _GetModuleFileNameEx = CAST_TO_FN_PTR( 1031 DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD), 1032 GetProcAddress(psapi, "GetModuleFileNameExA")); 1033 _GetModuleInformation = CAST_TO_FN_PTR( 1034 BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD), 1035 GetProcAddress(psapi, "GetModuleInformation")); 1036 1037 _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation); 1038 _psapi_init = true; 1039 return _has_psapi; 1040} 1041 1042static bool _init_toolhelp() { 1043 HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ; 1044 if (kernel32 == NULL) return false ; 1045 1046 _CreateToolhelp32Snapshot = CAST_TO_FN_PTR( 1047 HANDLE(WINAPI *)(DWORD,DWORD), 1048 GetProcAddress(kernel32, "CreateToolhelp32Snapshot")); 1049 _Module32First = CAST_TO_FN_PTR( 1050 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32), 1051 GetProcAddress(kernel32, "Module32First" )); 1052 _Module32Next = CAST_TO_FN_PTR( 1053 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32), 1054 GetProcAddress(kernel32, "Module32Next" )); 1055 1056 _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next); 1057 return _has_toolhelp; 1058} 1059 1060#ifdef _WIN64 1061// Helper routine which returns true if address in 1062// within the NTDLL address space. 1063// 1064static bool _addr_in_ntdll( address addr ) 1065{ 1066 HMODULE hmod; 1067 MODULEINFO minfo; 1068 1069 hmod = GetModuleHandle("NTDLL.DLL"); 1070 if ( hmod == NULL ) return false; 1071 if ( !_GetModuleInformation( GetCurrentProcess(), hmod, 1072 &minfo, sizeof(MODULEINFO)) ) 1073 return false; 1074 1075 if ( (addr >= minfo.lpBaseOfDll) && 1076 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) 1077 return true; 1078 else 1079 return false; 1080} 1081#endif 1082 1083 1084// Enumerate all modules for a given process ID 1085// 1086// Notice that Windows 95/98/Me and Windows NT/2000/XP have 1087// different API for doing this. We use PSAPI.DLL on NT based 1088// Windows and ToolHelp on 95/98/Me. 1089 1090// Callback function that is called by enumerate_modules() on 1091// every DLL module. 1092// Input parameters: 1093// int pid, 1094// char* module_file_name, 1095// address module_base_addr, 1096// unsigned module_size, 1097// void* param 1098typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *); 1099 1100// enumerate_modules for Windows NT, using PSAPI 1101static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param) 1102{ 1103 HANDLE hProcess ; 1104 1105# define MAX_NUM_MODULES 128 1106 HMODULE modules[MAX_NUM_MODULES]; 1107 static char filename[ MAX_PATH ]; 1108 int result = 0; 1109 1110 if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0; 1111 1112 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1113 FALSE, pid ) ; 1114 if (hProcess == NULL) return 0; 1115 1116 DWORD size_needed; 1117 if (!_EnumProcessModules(hProcess, modules, 1118 sizeof(modules), &size_needed)) { 1119 CloseHandle( hProcess ); 1120 return 0; 1121 } 1122 1123 // number of modules that are currently loaded 1124 int num_modules = size_needed / sizeof(HMODULE); 1125 1126 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1127 // Get Full pathname: 1128 if(!_GetModuleFileNameEx(hProcess, modules[i], 1129 filename, sizeof(filename))) { 1130 filename[0] = '\0'; 1131 } 1132 1133 MODULEINFO modinfo; 1134 if (!_GetModuleInformation(hProcess, modules[i], 1135 &modinfo, sizeof(modinfo))) { 1136 modinfo.lpBaseOfDll = NULL; 1137 modinfo.SizeOfImage = 0; 1138 } 1139 1140 // Invoke callback function 1141 result = func(pid, filename, (address)modinfo.lpBaseOfDll, 1142 modinfo.SizeOfImage, param); 1143 if (result) break; 1144 } 1145 1146 CloseHandle( hProcess ) ; 1147 return result; 1148} 1149 1150 1151// enumerate_modules for Windows 95/98/ME, using TOOLHELP 1152static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param) 1153{ 1154 HANDLE hSnapShot ; 1155 static MODULEENTRY32 modentry ; 1156 int result = 0; 1157 1158 if (!_has_toolhelp) return 0; 1159 1160 // Get a handle to a Toolhelp snapshot of the system 1161 hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ; 1162 if( hSnapShot == INVALID_HANDLE_VALUE ) { 1163 return FALSE ; 1164 } 1165 1166 // iterate through all modules 1167 modentry.dwSize = sizeof(MODULEENTRY32) ; 1168 bool not_done = _Module32First( hSnapShot, &modentry ) != 0; 1169 1170 while( not_done ) { 1171 // invoke the callback 1172 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr, 1173 modentry.modBaseSize, param); 1174 if (result) break; 1175 1176 modentry.dwSize = sizeof(MODULEENTRY32) ; 1177 not_done = _Module32Next( hSnapShot, &modentry ) != 0; 1178 } 1179 1180 CloseHandle(hSnapShot); 1181 return result; 1182} 1183 1184int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param ) 1185{ 1186 // Get current process ID if caller doesn't provide it. 1187 if (!pid) pid = os::current_process_id(); 1188 1189 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param); 1190 else return _enumerate_modules_windows(pid, func, param); 1191} 1192 1193struct _modinfo { 1194 address addr; 1195 char* full_path; // point to a char buffer 1196 int buflen; // size of the buffer 1197 address base_addr; 1198}; 1199 1200static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr, 1201 unsigned size, void * param) { 1202 struct _modinfo *pmod = (struct _modinfo *)param; 1203 if (!pmod) return -1; 1204 1205 if (base_addr <= pmod->addr && 1206 base_addr+size > pmod->addr) { 1207 // if a buffer is provided, copy path name to the buffer 1208 if (pmod->full_path) { 1209 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1210 } 1211 pmod->base_addr = base_addr; 1212 return 1; 1213 } 1214 return 0; 1215} 1216 1217bool os::dll_address_to_library_name(address addr, char* buf, 1218 int buflen, int* offset) { 1219// NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1220// return the full path to the DLL file, sometimes it returns path 1221// to the corresponding PDB file (debug info); sometimes it only 1222// returns partial path, which makes life painful. 1223 1224 struct _modinfo mi; 1225 mi.addr = addr; 1226 mi.full_path = buf; 1227 mi.buflen = buflen; 1228 int pid = os::current_process_id(); 1229 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) { 1230 // buf already contains path name 1231 if (offset) *offset = addr - mi.base_addr; 1232 return true; 1233 } else { 1234 if (buf) buf[0] = '\0'; 1235 if (offset) *offset = -1; 1236 return false; 1237 } 1238} 1239 1240bool os::dll_address_to_function_name(address addr, char *buf, 1241 int buflen, int *offset) { 1242 // Unimplemented on Windows - in order to use SymGetSymFromAddr(), 1243 // we need to initialize imagehlp/dbghelp, then load symbol table 1244 // for every module. That's too much work to do after a fatal error. 1245 // For an example on how to implement this function, see 1.4.2. 1246 if (offset) *offset = -1; 1247 if (buf) buf[0] = '\0'; 1248 return false; 1249} 1250 1251// save the start and end address of jvm.dll into param[0] and param[1] 1252static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr, 1253 unsigned size, void * param) { 1254 if (!param) return -1; 1255 1256 if (base_addr <= (address)_locate_jvm_dll && 1257 base_addr+size > (address)_locate_jvm_dll) { 1258 ((address*)param)[0] = base_addr; 1259 ((address*)param)[1] = base_addr + size; 1260 return 1; 1261 } 1262 return 0; 1263} 1264 1265address vm_lib_location[2]; // start and end address of jvm.dll 1266 1267// check if addr is inside jvm.dll 1268bool os::address_is_in_vm(address addr) { 1269 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1270 int pid = os::current_process_id(); 1271 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) { 1272 assert(false, "Can't find jvm module."); 1273 return false; 1274 } 1275 } 1276 1277 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1278} 1279 1280// print module info; param is outputStream* 1281static int _print_module(int pid, char* fname, address base, 1282 unsigned size, void* param) { 1283 if (!param) return -1; 1284 1285 outputStream* st = (outputStream*)param; 1286 1287 address end_addr = base + size; 1288 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname); 1289 return 0; 1290} 1291 1292// Loads .dll/.so and 1293// in case of error it checks if .dll/.so was built for the 1294// same architecture as Hotspot is running on 1295void * os::dll_load(const char *name, char *ebuf, int ebuflen) 1296{ 1297 void * result = LoadLibrary(name); 1298 if (result != NULL) 1299 { 1300 return result; 1301 } 1302 1303 long errcode = GetLastError(); 1304 if (errcode == ERROR_MOD_NOT_FOUND) { 1305 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1); 1306 ebuf[ebuflen-1]='\0'; 1307 return NULL; 1308 } 1309 1310 // Parsing dll below 1311 // If we can read dll-info and find that dll was built 1312 // for an architecture other than Hotspot is running in 1313 // - then print to buffer "DLL was built for a different architecture" 1314 // else call getLastErrorString to obtain system error message 1315 1316 // Read system error message into ebuf 1317 // It may or may not be overwritten below (in the for loop and just above) 1318 getLastErrorString(ebuf, (size_t) ebuflen); 1319 ebuf[ebuflen-1]='\0'; 1320 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0); 1321 if (file_descriptor<0) 1322 { 1323 return NULL; 1324 } 1325 1326 uint32_t signature_offset; 1327 uint16_t lib_arch=0; 1328 bool failed_to_get_lib_arch= 1329 ( 1330 //Go to position 3c in the dll 1331 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0) 1332 || 1333 // Read loacation of signature 1334 (sizeof(signature_offset)!= 1335 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset)))) 1336 || 1337 //Go to COFF File Header in dll 1338 //that is located after"signature" (4 bytes long) 1339 (os::seek_to_file_offset(file_descriptor, 1340 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0) 1341 || 1342 //Read field that contains code of architecture 1343 // that dll was build for 1344 (sizeof(lib_arch)!= 1345 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch)))) 1346 ); 1347 1348 ::close(file_descriptor); 1349 if (failed_to_get_lib_arch) 1350 { 1351 // file i/o error - report getLastErrorString(...) msg 1352 return NULL; 1353 } 1354 1355 typedef struct 1356 { 1357 uint16_t arch_code; 1358 char* arch_name; 1359 } arch_t; 1360 1361 static const arch_t arch_array[]={ 1362 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1363 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1364 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1365 }; 1366 #if (defined _M_IA64) 1367 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64; 1368 #elif (defined _M_AMD64) 1369 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64; 1370 #elif (defined _M_IX86) 1371 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386; 1372 #else 1373 #error Method os::dll_load requires that one of following \ 1374 is defined :_M_IA64,_M_AMD64 or _M_IX86 1375 #endif 1376 1377 1378 // Obtain a string for printf operation 1379 // lib_arch_str shall contain string what platform this .dll was built for 1380 // running_arch_str shall string contain what platform Hotspot was built for 1381 char *running_arch_str=NULL,*lib_arch_str=NULL; 1382 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++) 1383 { 1384 if (lib_arch==arch_array[i].arch_code) 1385 lib_arch_str=arch_array[i].arch_name; 1386 if (running_arch==arch_array[i].arch_code) 1387 running_arch_str=arch_array[i].arch_name; 1388 } 1389 1390 assert(running_arch_str, 1391 "Didn't find runing architecture code in arch_array"); 1392 1393 // If the architure is right 1394 // but some other error took place - report getLastErrorString(...) msg 1395 if (lib_arch == running_arch) 1396 { 1397 return NULL; 1398 } 1399 1400 if (lib_arch_str!=NULL) 1401 { 1402 ::_snprintf(ebuf, ebuflen-1, 1403 "Can't load %s-bit .dll on a %s-bit platform", 1404 lib_arch_str,running_arch_str); 1405 } 1406 else 1407 { 1408 // don't know what architecture this dll was build for 1409 ::_snprintf(ebuf, ebuflen-1, 1410 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1411 lib_arch,running_arch_str); 1412 } 1413 1414 return NULL; 1415} 1416 1417 1418void os::print_dll_info(outputStream *st) { 1419 int pid = os::current_process_id(); 1420 st->print_cr("Dynamic libraries:"); 1421 enumerate_modules(pid, _print_module, (void *)st); 1422} 1423 1424void os::print_os_info(outputStream* st) { 1425 st->print("OS:"); 1426 1427 OSVERSIONINFOEX osvi; 1428 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1429 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1430 1431 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1432 st->print_cr("N/A"); 1433 return; 1434 } 1435 1436 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion; 1437 1438 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) { 1439 switch (os_vers) { 1440 case 3051: st->print(" Windows NT 3.51"); break; 1441 case 4000: st->print(" Windows NT 4.0"); break; 1442 case 5000: st->print(" Windows 2000"); break; 1443 case 5001: st->print(" Windows XP"); break; 1444 case 5002: st->print(" Windows Server 2003 family"); break; 1445 case 6000: st->print(" Windows Vista"); break; 1446 default: // future windows, print out its major and minor versions 1447 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1448 } 1449 } else { 1450 switch (os_vers) { 1451 case 4000: st->print(" Windows 95"); break; 1452 case 4010: st->print(" Windows 98"); break; 1453 case 4090: st->print(" Windows Me"); break; 1454 default: // future windows, print out its major and minor versions 1455 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1456 } 1457 } 1458 1459 st->print(" Build %d", osvi.dwBuildNumber); 1460 st->print(" %s", osvi.szCSDVersion); // service pack 1461 st->cr(); 1462} 1463 1464void os::print_memory_info(outputStream* st) { 1465 st->print("Memory:"); 1466 st->print(" %dk page", os::vm_page_size()>>10); 1467 1468 // FIXME: GlobalMemoryStatus() may return incorrect value if total memory 1469 // is larger than 4GB 1470 MEMORYSTATUS ms; 1471 GlobalMemoryStatus(&ms); 1472 1473 st->print(", physical %uk", os::physical_memory() >> 10); 1474 st->print("(%uk free)", os::available_memory() >> 10); 1475 1476 st->print(", swap %uk", ms.dwTotalPageFile >> 10); 1477 st->print("(%uk free)", ms.dwAvailPageFile >> 10); 1478 st->cr(); 1479} 1480 1481void os::print_siginfo(outputStream *st, void *siginfo) { 1482 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1483 st->print("siginfo:"); 1484 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1485 1486 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1487 er->NumberParameters >= 2) { 1488 switch (er->ExceptionInformation[0]) { 1489 case 0: st->print(", reading address"); break; 1490 case 1: st->print(", writing address"); break; 1491 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1492 er->ExceptionInformation[0]); 1493 } 1494 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1495 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1496 er->NumberParameters >= 2 && UseSharedSpaces) { 1497 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1498 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1499 st->print("\n\nError accessing class data sharing archive." \ 1500 " Mapped file inaccessible during execution, " \ 1501 " possible disk/network problem."); 1502 } 1503 } else { 1504 int num = er->NumberParameters; 1505 if (num > 0) { 1506 st->print(", ExceptionInformation="); 1507 for (int i = 0; i < num; i++) { 1508 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1509 } 1510 } 1511 } 1512 st->cr(); 1513} 1514 1515void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1516 // do nothing 1517} 1518 1519static char saved_jvm_path[MAX_PATH] = {0}; 1520 1521// Find the full path to the current module, jvm.dll or jvm_g.dll 1522void os::jvm_path(char *buf, jint buflen) { 1523 // Error checking. 1524 if (buflen < MAX_PATH) { 1525 assert(false, "must use a large-enough buffer"); 1526 buf[0] = '\0'; 1527 return; 1528 } 1529 // Lazy resolve the path to current module. 1530 if (saved_jvm_path[0] != 0) { 1531 strcpy(buf, saved_jvm_path); 1532 return; 1533 } 1534 1535 GetModuleFileName(vm_lib_handle, buf, buflen); 1536 strcpy(saved_jvm_path, buf); 1537} 1538 1539 1540void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1541#ifndef _WIN64 1542 st->print("_"); 1543#endif 1544} 1545 1546 1547void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1548#ifndef _WIN64 1549 st->print("@%d", args_size * sizeof(int)); 1550#endif 1551} 1552 1553// sun.misc.Signal 1554// NOTE that this is a workaround for an apparent kernel bug where if 1555// a signal handler for SIGBREAK is installed then that signal handler 1556// takes priority over the console control handler for CTRL_CLOSE_EVENT. 1557// See bug 4416763. 1558static void (*sigbreakHandler)(int) = NULL; 1559 1560static void UserHandler(int sig, void *siginfo, void *context) { 1561 os::signal_notify(sig); 1562 // We need to reinstate the signal handler each time... 1563 os::signal(sig, (void*)UserHandler); 1564} 1565 1566void* os::user_handler() { 1567 return (void*) UserHandler; 1568} 1569 1570void* os::signal(int signal_number, void* handler) { 1571 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1572 void (*oldHandler)(int) = sigbreakHandler; 1573 sigbreakHandler = (void (*)(int)) handler; 1574 return (void*) oldHandler; 1575 } else { 1576 return (void*)::signal(signal_number, (void (*)(int))handler); 1577 } 1578} 1579 1580void os::signal_raise(int signal_number) { 1581 raise(signal_number); 1582} 1583 1584// The Win32 C runtime library maps all console control events other than ^C 1585// into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1586// logoff, and shutdown events. We therefore install our own console handler 1587// that raises SIGTERM for the latter cases. 1588// 1589static BOOL WINAPI consoleHandler(DWORD event) { 1590 switch(event) { 1591 case CTRL_C_EVENT: 1592 if (is_error_reported()) { 1593 // Ctrl-C is pressed during error reporting, likely because the error 1594 // handler fails to abort. Let VM die immediately. 1595 os::die(); 1596 } 1597 1598 os::signal_raise(SIGINT); 1599 return TRUE; 1600 break; 1601 case CTRL_BREAK_EVENT: 1602 if (sigbreakHandler != NULL) { 1603 (*sigbreakHandler)(SIGBREAK); 1604 } 1605 return TRUE; 1606 break; 1607 case CTRL_CLOSE_EVENT: 1608 case CTRL_LOGOFF_EVENT: 1609 case CTRL_SHUTDOWN_EVENT: 1610 os::signal_raise(SIGTERM); 1611 return TRUE; 1612 break; 1613 default: 1614 break; 1615 } 1616 return FALSE; 1617} 1618 1619/* 1620 * The following code is moved from os.cpp for making this 1621 * code platform specific, which it is by its very nature. 1622 */ 1623 1624// Return maximum OS signal used + 1 for internal use only 1625// Used as exit signal for signal_thread 1626int os::sigexitnum_pd(){ 1627 return NSIG; 1628} 1629 1630// a counter for each possible signal value, including signal_thread exit signal 1631static volatile jint pending_signals[NSIG+1] = { 0 }; 1632static HANDLE sig_sem; 1633 1634void os::signal_init_pd() { 1635 // Initialize signal structures 1636 memset((void*)pending_signals, 0, sizeof(pending_signals)); 1637 1638 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 1639 1640 // Programs embedding the VM do not want it to attempt to receive 1641 // events like CTRL_LOGOFF_EVENT, which are used to implement the 1642 // shutdown hooks mechanism introduced in 1.3. For example, when 1643 // the VM is run as part of a Windows NT service (i.e., a servlet 1644 // engine in a web server), the correct behavior is for any console 1645 // control handler to return FALSE, not TRUE, because the OS's 1646 // "final" handler for such events allows the process to continue if 1647 // it is a service (while terminating it if it is not a service). 1648 // To make this behavior uniform and the mechanism simpler, we 1649 // completely disable the VM's usage of these console events if -Xrs 1650 // (=ReduceSignalUsage) is specified. This means, for example, that 1651 // the CTRL-BREAK thread dump mechanism is also disabled in this 1652 // case. See bugs 4323062, 4345157, and related bugs. 1653 1654 if (!ReduceSignalUsage) { 1655 // Add a CTRL-C handler 1656 SetConsoleCtrlHandler(consoleHandler, TRUE); 1657 } 1658} 1659 1660void os::signal_notify(int signal_number) { 1661 BOOL ret; 1662 1663 Atomic::inc(&pending_signals[signal_number]); 1664 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 1665 assert(ret != 0, "ReleaseSemaphore() failed"); 1666} 1667 1668static int check_pending_signals(bool wait_for_signal) { 1669 DWORD ret; 1670 while (true) { 1671 for (int i = 0; i < NSIG + 1; i++) { 1672 jint n = pending_signals[i]; 1673 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1674 return i; 1675 } 1676 } 1677 if (!wait_for_signal) { 1678 return -1; 1679 } 1680 1681 JavaThread *thread = JavaThread::current(); 1682 1683 ThreadBlockInVM tbivm(thread); 1684 1685 bool threadIsSuspended; 1686 do { 1687 thread->set_suspend_equivalent(); 1688 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1689 ret = ::WaitForSingleObject(sig_sem, INFINITE); 1690 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 1691 1692 // were we externally suspended while we were waiting? 1693 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1694 if (threadIsSuspended) { 1695 // 1696 // The semaphore has been incremented, but while we were waiting 1697 // another thread suspended us. We don't want to continue running 1698 // while suspended because that would surprise the thread that 1699 // suspended us. 1700 // 1701 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 1702 assert(ret != 0, "ReleaseSemaphore() failed"); 1703 1704 thread->java_suspend_self(); 1705 } 1706 } while (threadIsSuspended); 1707 } 1708} 1709 1710int os::signal_lookup() { 1711 return check_pending_signals(false); 1712} 1713 1714int os::signal_wait() { 1715 return check_pending_signals(true); 1716} 1717 1718// Implicit OS exception handling 1719 1720LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) { 1721 JavaThread* thread = JavaThread::current(); 1722 // Save pc in thread 1723#ifdef _M_IA64 1724 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP); 1725 // Set pc to handler 1726 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 1727#elif _M_AMD64 1728 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip); 1729 // Set pc to handler 1730 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 1731#else 1732 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip); 1733 // Set pc to handler 1734 exceptionInfo->ContextRecord->Eip = (LONG)handler; 1735#endif 1736 1737 // Continue the execution 1738 return EXCEPTION_CONTINUE_EXECUTION; 1739} 1740 1741 1742// Used for PostMortemDump 1743extern "C" void safepoints(); 1744extern "C" void find(int x); 1745extern "C" void events(); 1746 1747// According to Windows API documentation, an illegal instruction sequence should generate 1748// the 0xC000001C exception code. However, real world experience shows that occasionnaly 1749// the execution of an illegal instruction can generate the exception code 0xC000001E. This 1750// seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 1751 1752#define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 1753 1754// From "Execution Protection in the Windows Operating System" draft 0.35 1755// Once a system header becomes available, the "real" define should be 1756// included or copied here. 1757#define EXCEPTION_INFO_EXEC_VIOLATION 0x08 1758 1759#define def_excpt(val) #val, val 1760 1761struct siglabel { 1762 char *name; 1763 int number; 1764}; 1765 1766struct siglabel exceptlabels[] = { 1767 def_excpt(EXCEPTION_ACCESS_VIOLATION), 1768 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 1769 def_excpt(EXCEPTION_BREAKPOINT), 1770 def_excpt(EXCEPTION_SINGLE_STEP), 1771 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 1772 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 1773 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 1774 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 1775 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 1776 def_excpt(EXCEPTION_FLT_OVERFLOW), 1777 def_excpt(EXCEPTION_FLT_STACK_CHECK), 1778 def_excpt(EXCEPTION_FLT_UNDERFLOW), 1779 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 1780 def_excpt(EXCEPTION_INT_OVERFLOW), 1781 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 1782 def_excpt(EXCEPTION_IN_PAGE_ERROR), 1783 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 1784 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 1785 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 1786 def_excpt(EXCEPTION_STACK_OVERFLOW), 1787 def_excpt(EXCEPTION_INVALID_DISPOSITION), 1788 def_excpt(EXCEPTION_GUARD_PAGE), 1789 def_excpt(EXCEPTION_INVALID_HANDLE), 1790 NULL, 0 1791}; 1792 1793const char* os::exception_name(int exception_code, char *buf, size_t size) { 1794 for (int i = 0; exceptlabels[i].name != NULL; i++) { 1795 if (exceptlabels[i].number == exception_code) { 1796 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 1797 return buf; 1798 } 1799 } 1800 1801 return NULL; 1802} 1803 1804//----------------------------------------------------------------------------- 1805LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 1806 // handle exception caused by idiv; should only happen for -MinInt/-1 1807 // (division by zero is handled explicitly) 1808#ifdef _M_IA64 1809 assert(0, "Fix Handle_IDiv_Exception"); 1810#elif _M_AMD64 1811 PCONTEXT ctx = exceptionInfo->ContextRecord; 1812 address pc = (address)ctx->Rip; 1813 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc)); 1814 assert(pc[0] == 0xF7, "not an idiv opcode"); 1815 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 1816 assert(ctx->Rax == min_jint, "unexpected idiv exception"); 1817 // set correct result values and continue after idiv instruction 1818 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 1819 ctx->Rax = (DWORD)min_jint; // result 1820 ctx->Rdx = (DWORD)0; // remainder 1821 // Continue the execution 1822#else 1823 PCONTEXT ctx = exceptionInfo->ContextRecord; 1824 address pc = (address)ctx->Eip; 1825 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc)); 1826 assert(pc[0] == 0xF7, "not an idiv opcode"); 1827 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 1828 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 1829 // set correct result values and continue after idiv instruction 1830 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 1831 ctx->Eax = (DWORD)min_jint; // result 1832 ctx->Edx = (DWORD)0; // remainder 1833 // Continue the execution 1834#endif 1835 return EXCEPTION_CONTINUE_EXECUTION; 1836} 1837 1838#ifndef _WIN64 1839//----------------------------------------------------------------------------- 1840LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 1841 // handle exception caused by native mothod modifying control word 1842 PCONTEXT ctx = exceptionInfo->ContextRecord; 1843 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 1844 1845 switch (exception_code) { 1846 case EXCEPTION_FLT_DENORMAL_OPERAND: 1847 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 1848 case EXCEPTION_FLT_INEXACT_RESULT: 1849 case EXCEPTION_FLT_INVALID_OPERATION: 1850 case EXCEPTION_FLT_OVERFLOW: 1851 case EXCEPTION_FLT_STACK_CHECK: 1852 case EXCEPTION_FLT_UNDERFLOW: 1853 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 1854 if (fp_control_word != ctx->FloatSave.ControlWord) { 1855 // Restore FPCW and mask out FLT exceptions 1856 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 1857 // Mask out pending FLT exceptions 1858 ctx->FloatSave.StatusWord &= 0xffffff00; 1859 return EXCEPTION_CONTINUE_EXECUTION; 1860 } 1861 } 1862 return EXCEPTION_CONTINUE_SEARCH; 1863} 1864#else //_WIN64 1865/* 1866 On Windows, the mxcsr control bits are non-volatile across calls 1867 See also CR 6192333 1868 If EXCEPTION_FLT_* happened after some native method modified 1869 mxcsr - it is not a jvm fault. 1870 However should we decide to restore of mxcsr after a faulty 1871 native method we can uncomment following code 1872 jint MxCsr = INITIAL_MXCSR; 1873 // we can't use StubRoutines::addr_mxcsr_std() 1874 // because in Win64 mxcsr is not saved there 1875 if (MxCsr != ctx->MxCsr) { 1876 ctx->MxCsr = MxCsr; 1877 return EXCEPTION_CONTINUE_EXECUTION; 1878 } 1879 1880*/ 1881#endif //_WIN64 1882 1883 1884// Fatal error reporting is single threaded so we can make this a 1885// static and preallocated. If it's more than MAX_PATH silently ignore 1886// it. 1887static char saved_error_file[MAX_PATH] = {0}; 1888 1889void os::set_error_file(const char *logfile) { 1890 if (strlen(logfile) <= MAX_PATH) { 1891 strncpy(saved_error_file, logfile, MAX_PATH); 1892 } 1893} 1894 1895static inline void report_error(Thread* t, DWORD exception_code, 1896 address addr, void* siginfo, void* context) { 1897 VMError err(t, exception_code, addr, siginfo, context); 1898 err.report_and_die(); 1899 1900 // If UseOsErrorReporting, this will return here and save the error file 1901 // somewhere where we can find it in the minidump. 1902} 1903 1904//----------------------------------------------------------------------------- 1905LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 1906 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 1907 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 1908#ifdef _M_IA64 1909 address pc = (address) exceptionInfo->ContextRecord->StIIP; 1910#elif _M_AMD64 1911 address pc = (address) exceptionInfo->ContextRecord->Rip; 1912#else 1913 address pc = (address) exceptionInfo->ContextRecord->Eip; 1914#endif 1915 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 1916 1917#ifndef _WIN64 1918 // Execution protection violation - win32 running on AMD64 only 1919 // Handled first to avoid misdiagnosis as a "normal" access violation; 1920 // This is safe to do because we have a new/unique ExceptionInformation 1921 // code for this condition. 1922 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 1923 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 1924 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 1925 address addr = (address) exceptionRecord->ExceptionInformation[1]; 1926 1927 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 1928 int page_size = os::vm_page_size(); 1929 1930 // Make sure the pc and the faulting address are sane. 1931 // 1932 // If an instruction spans a page boundary, and the page containing 1933 // the beginning of the instruction is executable but the following 1934 // page is not, the pc and the faulting address might be slightly 1935 // different - we still want to unguard the 2nd page in this case. 1936 // 1937 // 15 bytes seems to be a (very) safe value for max instruction size. 1938 bool pc_is_near_addr = 1939 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 1940 bool instr_spans_page_boundary = 1941 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 1942 (intptr_t) page_size) > 0); 1943 1944 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 1945 static volatile address last_addr = 1946 (address) os::non_memory_address_word(); 1947 1948 // In conservative mode, don't unguard unless the address is in the VM 1949 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 1950 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 1951 1952 // Unguard and retry 1953 address page_start = 1954 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 1955 bool res = os::unguard_memory((char*) page_start, page_size); 1956 1957 if (PrintMiscellaneous && Verbose) { 1958 char buf[256]; 1959 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 1960 "at " INTPTR_FORMAT 1961 ", unguarding " INTPTR_FORMAT ": %s", addr, 1962 page_start, (res ? "success" : strerror(errno))); 1963 tty->print_raw_cr(buf); 1964 } 1965 1966 // Set last_addr so if we fault again at the same address, we don't 1967 // end up in an endless loop. 1968 // 1969 // There are two potential complications here. Two threads trapping 1970 // at the same address at the same time could cause one of the 1971 // threads to think it already unguarded, and abort the VM. Likely 1972 // very rare. 1973 // 1974 // The other race involves two threads alternately trapping at 1975 // different addresses and failing to unguard the page, resulting in 1976 // an endless loop. This condition is probably even more unlikely 1977 // than the first. 1978 // 1979 // Although both cases could be avoided by using locks or thread 1980 // local last_addr, these solutions are unnecessary complication: 1981 // this handler is a best-effort safety net, not a complete solution. 1982 // It is disabled by default and should only be used as a workaround 1983 // in case we missed any no-execute-unsafe VM code. 1984 1985 last_addr = addr; 1986 1987 return EXCEPTION_CONTINUE_EXECUTION; 1988 } 1989 } 1990 1991 // Last unguard failed or not unguarding 1992 tty->print_raw_cr("Execution protection violation"); 1993 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 1994 exceptionInfo->ContextRecord); 1995 return EXCEPTION_CONTINUE_SEARCH; 1996 } 1997 } 1998#endif // _WIN64 1999 2000 // Check to see if we caught the safepoint code in the 2001 // process of write protecting the memory serialization page. 2002 // It write enables the page immediately after protecting it 2003 // so just return. 2004 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { 2005 JavaThread* thread = (JavaThread*) t; 2006 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2007 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2008 if ( os::is_memory_serialize_page(thread, addr) ) { 2009 // Block current thread until the memory serialize page permission restored. 2010 os::block_on_serialize_page_trap(); 2011 return EXCEPTION_CONTINUE_EXECUTION; 2012 } 2013 } 2014 2015 2016 if (t != NULL && t->is_Java_thread()) { 2017 JavaThread* thread = (JavaThread*) t; 2018 bool in_java = thread->thread_state() == _thread_in_Java; 2019 2020 // Handle potential stack overflows up front. 2021 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2022 if (os::uses_stack_guard_pages()) { 2023#ifdef _M_IA64 2024 // 2025 // If it's a legal stack address continue, Windows will map it in. 2026 // 2027 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2028 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2029 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) 2030 return EXCEPTION_CONTINUE_EXECUTION; 2031 2032 // The register save area is the same size as the memory stack 2033 // and starts at the page just above the start of the memory stack. 2034 // If we get a fault in this area, we've run out of register 2035 // stack. If we are in java, try throwing a stack overflow exception. 2036 if (addr > thread->stack_base() && 2037 addr <= (thread->stack_base()+thread->stack_size()) ) { 2038 char buf[256]; 2039 jio_snprintf(buf, sizeof(buf), 2040 "Register stack overflow, addr:%p, stack_base:%p\n", 2041 addr, thread->stack_base() ); 2042 tty->print_raw_cr(buf); 2043 // If not in java code, return and hope for the best. 2044 return in_java ? Handle_Exception(exceptionInfo, 2045 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2046 : EXCEPTION_CONTINUE_EXECUTION; 2047 } 2048#endif 2049 if (thread->stack_yellow_zone_enabled()) { 2050 // Yellow zone violation. The o/s has unprotected the first yellow 2051 // zone page for us. Note: must call disable_stack_yellow_zone to 2052 // update the enabled status, even if the zone contains only one page. 2053 thread->disable_stack_yellow_zone(); 2054 // If not in java code, return and hope for the best. 2055 return in_java ? Handle_Exception(exceptionInfo, 2056 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2057 : EXCEPTION_CONTINUE_EXECUTION; 2058 } else { 2059 // Fatal red zone violation. 2060 thread->disable_stack_red_zone(); 2061 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2062 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2063 exceptionInfo->ContextRecord); 2064 return EXCEPTION_CONTINUE_SEARCH; 2065 } 2066 } else if (in_java) { 2067 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2068 // a one-time-only guard page, which it has released to us. The next 2069 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2070 return Handle_Exception(exceptionInfo, 2071 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2072 } else { 2073 // Can only return and hope for the best. Further stack growth will 2074 // result in an ACCESS_VIOLATION. 2075 return EXCEPTION_CONTINUE_EXECUTION; 2076 } 2077 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2078 // Either stack overflow or null pointer exception. 2079 if (in_java) { 2080 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2081 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2082 address stack_end = thread->stack_base() - thread->stack_size(); 2083 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2084 // Stack overflow. 2085 assert(!os::uses_stack_guard_pages(), 2086 "should be caught by red zone code above."); 2087 return Handle_Exception(exceptionInfo, 2088 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2089 } 2090 // 2091 // Check for safepoint polling and implicit null 2092 // We only expect null pointers in the stubs (vtable) 2093 // the rest are checked explicitly now. 2094 // 2095 CodeBlob* cb = CodeCache::find_blob(pc); 2096 if (cb != NULL) { 2097 if (os::is_poll_address(addr)) { 2098 address stub = SharedRuntime::get_poll_stub(pc); 2099 return Handle_Exception(exceptionInfo, stub); 2100 } 2101 } 2102 { 2103#ifdef _WIN64 2104 // 2105 // If it's a legal stack address map the entire region in 2106 // 2107 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2108 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2109 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) { 2110 addr = (address)((uintptr_t)addr & 2111 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2112 os::commit_memory( (char *)addr, thread->stack_base() - addr ); 2113 return EXCEPTION_CONTINUE_EXECUTION; 2114 } 2115 else 2116#endif 2117 { 2118 // Null pointer exception. 2119#ifdef _M_IA64 2120 // We catch register stack overflows in compiled code by doing 2121 // an explicit compare and executing a st8(G0, G0) if the 2122 // BSP enters into our guard area. We test for the overflow 2123 // condition and fall into the normal null pointer exception 2124 // code if BSP hasn't overflowed. 2125 if ( in_java ) { 2126 if(thread->register_stack_overflow()) { 2127 assert((address)exceptionInfo->ContextRecord->IntS3 == 2128 thread->register_stack_limit(), 2129 "GR7 doesn't contain register_stack_limit"); 2130 // Disable the yellow zone which sets the state that 2131 // we've got a stack overflow problem. 2132 if (thread->stack_yellow_zone_enabled()) { 2133 thread->disable_stack_yellow_zone(); 2134 } 2135 // Give us some room to process the exception 2136 thread->disable_register_stack_guard(); 2137 // Update GR7 with the new limit so we can continue running 2138 // compiled code. 2139 exceptionInfo->ContextRecord->IntS3 = 2140 (ULONGLONG)thread->register_stack_limit(); 2141 return Handle_Exception(exceptionInfo, 2142 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2143 } else { 2144 // 2145 // Check for implicit null 2146 // We only expect null pointers in the stubs (vtable) 2147 // the rest are checked explicitly now. 2148 // 2149 CodeBlob* cb = CodeCache::find_blob(pc); 2150 if (cb != NULL) { 2151 if (VtableStubs::stub_containing(pc) != NULL) { 2152 if (((uintptr_t)addr) < os::vm_page_size() ) { 2153 // an access to the first page of VM--assume it is a null pointer 2154 return Handle_Exception(exceptionInfo, 2155 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL)); 2156 } 2157 } 2158 } 2159 } 2160 } // in_java 2161 2162 // IA64 doesn't use implicit null checking yet. So we shouldn't 2163 // get here. 2164 tty->print_raw_cr("Access violation, possible null pointer exception"); 2165 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2166 exceptionInfo->ContextRecord); 2167 return EXCEPTION_CONTINUE_SEARCH; 2168#else /* !IA64 */ 2169 2170 // Windows 98 reports faulting addresses incorrectly 2171 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2172 !os::win32::is_nt()) { 2173 return Handle_Exception(exceptionInfo, 2174 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL)); 2175 } 2176 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2177 exceptionInfo->ContextRecord); 2178 return EXCEPTION_CONTINUE_SEARCH; 2179#endif 2180 } 2181 } 2182 } 2183 2184#ifdef _WIN64 2185 // Special care for fast JNI field accessors. 2186 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2187 // in and the heap gets shrunk before the field access. 2188 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2189 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2190 if (addr != (address)-1) { 2191 return Handle_Exception(exceptionInfo, addr); 2192 } 2193 } 2194#endif 2195 2196#ifdef _WIN64 2197 // Windows will sometimes generate an access violation 2198 // when we call malloc. Since we use VectoredExceptions 2199 // on 64 bit platforms, we see this exception. We must 2200 // pass this exception on so Windows can recover. 2201 // We check to see if the pc of the fault is in NTDLL.DLL 2202 // if so, we pass control on to Windows for handling. 2203 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH; 2204#endif 2205 2206 // Stack overflow or null pointer exception in native code. 2207 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2208 exceptionInfo->ContextRecord); 2209 return EXCEPTION_CONTINUE_SEARCH; 2210 } 2211 2212 if (in_java) { 2213 switch (exception_code) { 2214 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2215 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2216 2217 case EXCEPTION_INT_OVERFLOW: 2218 return Handle_IDiv_Exception(exceptionInfo); 2219 2220 } // switch 2221 } 2222#ifndef _WIN64 2223 if ((thread->thread_state() == _thread_in_Java) || 2224 (thread->thread_state() == _thread_in_native) ) 2225 { 2226 LONG result=Handle_FLT_Exception(exceptionInfo); 2227 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2228 } 2229#endif //_WIN64 2230 } 2231 2232 if (exception_code != EXCEPTION_BREAKPOINT) { 2233#ifndef _WIN64 2234 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2235 exceptionInfo->ContextRecord); 2236#else 2237 // Itanium Windows uses a VectoredExceptionHandler 2238 // Which means that C++ programatic exception handlers (try/except) 2239 // will get here. Continue the search for the right except block if 2240 // the exception code is not a fatal code. 2241 switch ( exception_code ) { 2242 case EXCEPTION_ACCESS_VIOLATION: 2243 case EXCEPTION_STACK_OVERFLOW: 2244 case EXCEPTION_ILLEGAL_INSTRUCTION: 2245 case EXCEPTION_ILLEGAL_INSTRUCTION_2: 2246 case EXCEPTION_INT_OVERFLOW: 2247 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2248 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2249 exceptionInfo->ContextRecord); 2250 } 2251 break; 2252 default: 2253 break; 2254 } 2255#endif 2256 } 2257 return EXCEPTION_CONTINUE_SEARCH; 2258} 2259 2260#ifndef _WIN64 2261// Special care for fast JNI accessors. 2262// jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2263// the heap gets shrunk before the field access. 2264// Need to install our own structured exception handler since native code may 2265// install its own. 2266LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2267 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2268 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2269 address pc = (address) exceptionInfo->ContextRecord->Eip; 2270 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2271 if (addr != (address)-1) { 2272 return Handle_Exception(exceptionInfo, addr); 2273 } 2274 } 2275 return EXCEPTION_CONTINUE_SEARCH; 2276} 2277 2278#define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \ 2279Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \ 2280 __try { \ 2281 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \ 2282 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \ 2283 } \ 2284 return 0; \ 2285} 2286 2287DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2288DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2289DEFINE_FAST_GETFIELD(jchar, char, Char) 2290DEFINE_FAST_GETFIELD(jshort, short, Short) 2291DEFINE_FAST_GETFIELD(jint, int, Int) 2292DEFINE_FAST_GETFIELD(jlong, long, Long) 2293DEFINE_FAST_GETFIELD(jfloat, float, Float) 2294DEFINE_FAST_GETFIELD(jdouble, double, Double) 2295 2296address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2297 switch (type) { 2298 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2299 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2300 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2301 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2302 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2303 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2304 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2305 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2306 default: ShouldNotReachHere(); 2307 } 2308 return (address)-1; 2309} 2310#endif 2311 2312// Virtual Memory 2313 2314int os::vm_page_size() { return os::win32::vm_page_size(); } 2315int os::vm_allocation_granularity() { 2316 return os::win32::vm_allocation_granularity(); 2317} 2318 2319// Windows large page support is available on Windows 2003. In order to use 2320// large page memory, the administrator must first assign additional privilege 2321// to the user: 2322// + select Control Panel -> Administrative Tools -> Local Security Policy 2323// + select Local Policies -> User Rights Assignment 2324// + double click "Lock pages in memory", add users and/or groups 2325// + reboot 2326// Note the above steps are needed for administrator as well, as administrators 2327// by default do not have the privilege to lock pages in memory. 2328// 2329// Note about Windows 2003: although the API supports committing large page 2330// memory on a page-by-page basis and VirtualAlloc() returns success under this 2331// scenario, I found through experiment it only uses large page if the entire 2332// memory region is reserved and committed in a single VirtualAlloc() call. 2333// This makes Windows large page support more or less like Solaris ISM, in 2334// that the entire heap must be committed upfront. This probably will change 2335// in the future, if so the code below needs to be revisited. 2336 2337#ifndef MEM_LARGE_PAGES 2338#define MEM_LARGE_PAGES 0x20000000 2339#endif 2340 2341// GetLargePageMinimum is only available on Windows 2003. The other functions 2342// are available on NT but not on Windows 98/Me. We have to resolve them at 2343// runtime. 2344typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void); 2345typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type) 2346 (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 2347typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE); 2348typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID); 2349 2350static GetLargePageMinimum_func_type _GetLargePageMinimum; 2351static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges; 2352static OpenProcessToken_func_type _OpenProcessToken; 2353static LookupPrivilegeValue_func_type _LookupPrivilegeValue; 2354 2355static HINSTANCE _kernel32; 2356static HINSTANCE _advapi32; 2357static HANDLE _hProcess; 2358static HANDLE _hToken; 2359 2360static size_t _large_page_size = 0; 2361 2362static bool resolve_functions_for_large_page_init() { 2363 _kernel32 = LoadLibrary("kernel32.dll"); 2364 if (_kernel32 == NULL) return false; 2365 2366 _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type, 2367 GetProcAddress(_kernel32, "GetLargePageMinimum")); 2368 if (_GetLargePageMinimum == NULL) return false; 2369 2370 _advapi32 = LoadLibrary("advapi32.dll"); 2371 if (_advapi32 == NULL) return false; 2372 2373 _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type, 2374 GetProcAddress(_advapi32, "AdjustTokenPrivileges")); 2375 _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type, 2376 GetProcAddress(_advapi32, "OpenProcessToken")); 2377 _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type, 2378 GetProcAddress(_advapi32, "LookupPrivilegeValueA")); 2379 return _AdjustTokenPrivileges != NULL && 2380 _OpenProcessToken != NULL && 2381 _LookupPrivilegeValue != NULL; 2382} 2383 2384static bool request_lock_memory_privilege() { 2385 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2386 os::current_process_id()); 2387 2388 LUID luid; 2389 if (_hProcess != NULL && 2390 _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2391 _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2392 2393 TOKEN_PRIVILEGES tp; 2394 tp.PrivilegeCount = 1; 2395 tp.Privileges[0].Luid = luid; 2396 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2397 2398 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2399 // privilege. Check GetLastError() too. See MSDN document. 2400 if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2401 (GetLastError() == ERROR_SUCCESS)) { 2402 return true; 2403 } 2404 } 2405 2406 return false; 2407} 2408 2409static void cleanup_after_large_page_init() { 2410 _GetLargePageMinimum = NULL; 2411 _AdjustTokenPrivileges = NULL; 2412 _OpenProcessToken = NULL; 2413 _LookupPrivilegeValue = NULL; 2414 if (_kernel32) FreeLibrary(_kernel32); 2415 _kernel32 = NULL; 2416 if (_advapi32) FreeLibrary(_advapi32); 2417 _advapi32 = NULL; 2418 if (_hProcess) CloseHandle(_hProcess); 2419 _hProcess = NULL; 2420 if (_hToken) CloseHandle(_hToken); 2421 _hToken = NULL; 2422} 2423 2424bool os::large_page_init() { 2425 if (!UseLargePages) return false; 2426 2427 // print a warning if any large page related flag is specified on command line 2428 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2429 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2430 bool success = false; 2431 2432# define WARN(msg) if (warn_on_failure) { warning(msg); } 2433 if (resolve_functions_for_large_page_init()) { 2434 if (request_lock_memory_privilege()) { 2435 size_t s = _GetLargePageMinimum(); 2436 if (s) { 2437#if defined(IA32) || defined(AMD64) 2438 if (s > 4*M || LargePageSizeInBytes > 4*M) { 2439 WARN("JVM cannot use large pages bigger than 4mb."); 2440 } else { 2441#endif 2442 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 2443 _large_page_size = LargePageSizeInBytes; 2444 } else { 2445 _large_page_size = s; 2446 } 2447 success = true; 2448#if defined(IA32) || defined(AMD64) 2449 } 2450#endif 2451 } else { 2452 WARN("Large page is not supported by the processor."); 2453 } 2454 } else { 2455 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 2456 } 2457 } else { 2458 WARN("Large page is not supported by the operating system."); 2459 } 2460#undef WARN 2461 2462 const size_t default_page_size = (size_t) vm_page_size(); 2463 if (success && _large_page_size > default_page_size) { 2464 _page_sizes[0] = _large_page_size; 2465 _page_sizes[1] = default_page_size; 2466 _page_sizes[2] = 0; 2467 } 2468 2469 cleanup_after_large_page_init(); 2470 return success; 2471} 2472 2473// On win32, one cannot release just a part of reserved memory, it's an 2474// all or nothing deal. When we split a reservation, we must break the 2475// reservation into two reservations. 2476void os::split_reserved_memory(char *base, size_t size, size_t split, 2477 bool realloc) { 2478 if (size > 0) { 2479 release_memory(base, size); 2480 if (realloc) { 2481 reserve_memory(split, base); 2482 } 2483 if (size != split) { 2484 reserve_memory(size - split, base + split); 2485 } 2486 } 2487} 2488 2489char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 2490 assert((size_t)addr % os::vm_allocation_granularity() == 0, 2491 "reserve alignment"); 2492 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size"); 2493 char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, 2494 PAGE_EXECUTE_READWRITE); 2495 assert(res == NULL || addr == NULL || addr == res, 2496 "Unexpected address from reserve."); 2497 return res; 2498} 2499 2500// Reserve memory at an arbitrary address, only if that area is 2501// available (and not reserved for something else). 2502char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2503 // Windows os::reserve_memory() fails of the requested address range is 2504 // not avilable. 2505 return reserve_memory(bytes, requested_addr); 2506} 2507 2508size_t os::large_page_size() { 2509 return _large_page_size; 2510} 2511 2512bool os::can_commit_large_page_memory() { 2513 // Windows only uses large page memory when the entire region is reserved 2514 // and committed in a single VirtualAlloc() call. This may change in the 2515 // future, but with Windows 2003 it's not possible to commit on demand. 2516 return false; 2517} 2518 2519bool os::can_execute_large_page_memory() { 2520 return true; 2521} 2522 2523char* os::reserve_memory_special(size_t bytes) { 2524 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 2525 char * res = (char *)VirtualAlloc(NULL, bytes, flag, PAGE_EXECUTE_READWRITE); 2526 return res; 2527} 2528 2529bool os::release_memory_special(char* base, size_t bytes) { 2530 return release_memory(base, bytes); 2531} 2532 2533void os::print_statistics() { 2534} 2535 2536bool os::commit_memory(char* addr, size_t bytes) { 2537 if (bytes == 0) { 2538 // Don't bother the OS with noops. 2539 return true; 2540 } 2541 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 2542 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 2543 // Don't attempt to print anything if the OS call fails. We're 2544 // probably low on resources, so the print itself may cause crashes. 2545 return VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_EXECUTE_READWRITE) != NULL; 2546} 2547 2548bool os::commit_memory(char* addr, size_t size, size_t alignment_hint) { 2549 return commit_memory(addr, size); 2550} 2551 2552bool os::uncommit_memory(char* addr, size_t bytes) { 2553 if (bytes == 0) { 2554 // Don't bother the OS with noops. 2555 return true; 2556 } 2557 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 2558 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 2559 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0; 2560} 2561 2562bool os::release_memory(char* addr, size_t bytes) { 2563 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 2564} 2565 2566bool os::protect_memory(char* addr, size_t bytes) { 2567 DWORD old_status; 2568 return VirtualProtect(addr, bytes, PAGE_READONLY, &old_status) != 0; 2569} 2570 2571bool os::guard_memory(char* addr, size_t bytes) { 2572 DWORD old_status; 2573 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE | PAGE_GUARD, &old_status) != 0; 2574} 2575 2576bool os::unguard_memory(char* addr, size_t bytes) { 2577 DWORD old_status; 2578 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &old_status) != 0; 2579} 2580 2581void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 2582void os::free_memory(char *addr, size_t bytes) { } 2583void os::numa_make_global(char *addr, size_t bytes) { } 2584void os::numa_make_local(char *addr, size_t bytes) { } 2585bool os::numa_topology_changed() { return false; } 2586size_t os::numa_get_groups_num() { return 1; } 2587int os::numa_get_group_id() { return 0; } 2588size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2589 if (size > 0) { 2590 ids[0] = 0; 2591 return 1; 2592 } 2593 return 0; 2594} 2595 2596bool os::get_page_info(char *start, page_info* info) { 2597 return false; 2598} 2599 2600char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2601 return end; 2602} 2603 2604char* os::non_memory_address_word() { 2605 // Must never look like an address returned by reserve_memory, 2606 // even in its subfields (as defined by the CPU immediate fields, 2607 // if the CPU splits constants across multiple instructions). 2608 return (char*)-1; 2609} 2610 2611#define MAX_ERROR_COUNT 100 2612#define SYS_THREAD_ERROR 0xffffffffUL 2613 2614void os::pd_start_thread(Thread* thread) { 2615 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 2616 // Returns previous suspend state: 2617 // 0: Thread was not suspended 2618 // 1: Thread is running now 2619 // >1: Thread is still suspended. 2620 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 2621} 2622 2623size_t os::read(int fd, void *buf, unsigned int nBytes) { 2624 return ::read(fd, buf, nBytes); 2625} 2626 2627class HighResolutionInterval { 2628 // The default timer resolution seems to be 10 milliseconds. 2629 // (Where is this written down?) 2630 // If someone wants to sleep for only a fraction of the default, 2631 // then we set the timer resolution down to 1 millisecond for 2632 // the duration of their interval. 2633 // We carefully set the resolution back, since otherwise we 2634 // seem to incur an overhead (3%?) that we don't need. 2635 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 2636 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 2637 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 2638 // timeBeginPeriod() if the relative error exceeded some threshold. 2639 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 2640 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 2641 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 2642 // resolution timers running. 2643private: 2644 jlong resolution; 2645public: 2646 HighResolutionInterval(jlong ms) { 2647 resolution = ms % 10L; 2648 if (resolution != 0) { 2649 MMRESULT result = timeBeginPeriod(1L); 2650 } 2651 } 2652 ~HighResolutionInterval() { 2653 if (resolution != 0) { 2654 MMRESULT result = timeEndPeriod(1L); 2655 } 2656 resolution = 0L; 2657 } 2658}; 2659 2660int os::sleep(Thread* thread, jlong ms, bool interruptable) { 2661 jlong limit = (jlong) MAXDWORD; 2662 2663 while(ms > limit) { 2664 int res; 2665 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) 2666 return res; 2667 ms -= limit; 2668 } 2669 2670 assert(thread == Thread::current(), "thread consistency check"); 2671 OSThread* osthread = thread->osthread(); 2672 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 2673 int result; 2674 if (interruptable) { 2675 assert(thread->is_Java_thread(), "must be java thread"); 2676 JavaThread *jt = (JavaThread *) thread; 2677 ThreadBlockInVM tbivm(jt); 2678 2679 jt->set_suspend_equivalent(); 2680 // cleared by handle_special_suspend_equivalent_condition() or 2681 // java_suspend_self() via check_and_wait_while_suspended() 2682 2683 HANDLE events[1]; 2684 events[0] = osthread->interrupt_event(); 2685 HighResolutionInterval *phri=NULL; 2686 if(!ForceTimeHighResolution) 2687 phri = new HighResolutionInterval( ms ); 2688 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 2689 result = OS_TIMEOUT; 2690 } else { 2691 ResetEvent(osthread->interrupt_event()); 2692 osthread->set_interrupted(false); 2693 result = OS_INTRPT; 2694 } 2695 delete phri; //if it is NULL, harmless 2696 2697 // were we externally suspended while we were waiting? 2698 jt->check_and_wait_while_suspended(); 2699 } else { 2700 assert(!thread->is_Java_thread(), "must not be java thread"); 2701 Sleep((long) ms); 2702 result = OS_TIMEOUT; 2703 } 2704 return result; 2705} 2706 2707// Sleep forever; naked call to OS-specific sleep; use with CAUTION 2708void os::infinite_sleep() { 2709 while (true) { // sleep forever ... 2710 Sleep(100000); // ... 100 seconds at a time 2711 } 2712} 2713 2714typedef BOOL (WINAPI * STTSignature)(void) ; 2715 2716os::YieldResult os::NakedYield() { 2717 // Use either SwitchToThread() or Sleep(0) 2718 // Consider passing back the return value from SwitchToThread(). 2719 // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread. 2720 // In that case we revert to Sleep(0). 2721 static volatile STTSignature stt = (STTSignature) 1 ; 2722 2723 if (stt == ((STTSignature) 1)) { 2724 stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ; 2725 // It's OK if threads race during initialization as the operation above is idempotent. 2726 } 2727 if (stt != NULL) { 2728 return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ; 2729 } else { 2730 Sleep (0) ; 2731 } 2732 return os::YIELD_UNKNOWN ; 2733} 2734 2735void os::yield() { os::NakedYield(); } 2736 2737void os::yield_all(int attempts) { 2738 // Yields to all threads, including threads with lower priorities 2739 Sleep(1); 2740} 2741 2742// Win32 only gives you access to seven real priorities at a time, 2743// so we compress Java's ten down to seven. It would be better 2744// if we dynamically adjusted relative priorities. 2745 2746int os::java_to_os_priority[MaxPriority + 1] = { 2747 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 2748 THREAD_PRIORITY_LOWEST, // 1 MinPriority 2749 THREAD_PRIORITY_LOWEST, // 2 2750 THREAD_PRIORITY_BELOW_NORMAL, // 3 2751 THREAD_PRIORITY_BELOW_NORMAL, // 4 2752 THREAD_PRIORITY_NORMAL, // 5 NormPriority 2753 THREAD_PRIORITY_NORMAL, // 6 2754 THREAD_PRIORITY_ABOVE_NORMAL, // 7 2755 THREAD_PRIORITY_ABOVE_NORMAL, // 8 2756 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 2757 THREAD_PRIORITY_HIGHEST // 10 MaxPriority 2758}; 2759 2760int prio_policy1[MaxPriority + 1] = { 2761 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 2762 THREAD_PRIORITY_LOWEST, // 1 MinPriority 2763 THREAD_PRIORITY_LOWEST, // 2 2764 THREAD_PRIORITY_BELOW_NORMAL, // 3 2765 THREAD_PRIORITY_BELOW_NORMAL, // 4 2766 THREAD_PRIORITY_NORMAL, // 5 NormPriority 2767 THREAD_PRIORITY_ABOVE_NORMAL, // 6 2768 THREAD_PRIORITY_ABOVE_NORMAL, // 7 2769 THREAD_PRIORITY_HIGHEST, // 8 2770 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 2771 THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority 2772}; 2773 2774static int prio_init() { 2775 // If ThreadPriorityPolicy is 1, switch tables 2776 if (ThreadPriorityPolicy == 1) { 2777 int i; 2778 for (i = 0; i < MaxPriority + 1; i++) { 2779 os::java_to_os_priority[i] = prio_policy1[i]; 2780 } 2781 } 2782 return 0; 2783} 2784 2785OSReturn os::set_native_priority(Thread* thread, int priority) { 2786 if (!UseThreadPriorities) return OS_OK; 2787 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 2788 return ret ? OS_OK : OS_ERR; 2789} 2790 2791OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) { 2792 if ( !UseThreadPriorities ) { 2793 *priority_ptr = java_to_os_priority[NormPriority]; 2794 return OS_OK; 2795 } 2796 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 2797 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 2798 assert(false, "GetThreadPriority failed"); 2799 return OS_ERR; 2800 } 2801 *priority_ptr = os_prio; 2802 return OS_OK; 2803} 2804 2805 2806// Hint to the underlying OS that a task switch would not be good. 2807// Void return because it's a hint and can fail. 2808void os::hint_no_preempt() {} 2809 2810void os::interrupt(Thread* thread) { 2811 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 2812 "possibility of dangling Thread pointer"); 2813 2814 OSThread* osthread = thread->osthread(); 2815 osthread->set_interrupted(true); 2816 // More than one thread can get here with the same value of osthread, 2817 // resulting in multiple notifications. We do, however, want the store 2818 // to interrupted() to be visible to other threads before we post 2819 // the interrupt event. 2820 OrderAccess::release(); 2821 SetEvent(osthread->interrupt_event()); 2822 // For JSR166: unpark after setting status 2823 if (thread->is_Java_thread()) 2824 ((JavaThread*)thread)->parker()->unpark(); 2825 2826 ParkEvent * ev = thread->_ParkEvent ; 2827 if (ev != NULL) ev->unpark() ; 2828 2829} 2830 2831 2832bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 2833 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 2834 "possibility of dangling Thread pointer"); 2835 2836 OSThread* osthread = thread->osthread(); 2837 bool interrupted; 2838 interrupted = osthread->interrupted(); 2839 if (clear_interrupted == true) { 2840 osthread->set_interrupted(false); 2841 ResetEvent(osthread->interrupt_event()); 2842 } // Otherwise leave the interrupted state alone 2843 2844 return interrupted; 2845} 2846 2847// Get's a pc (hint) for a running thread. Currently used only for profiling. 2848ExtendedPC os::get_thread_pc(Thread* thread) { 2849 CONTEXT context; 2850 context.ContextFlags = CONTEXT_CONTROL; 2851 HANDLE handle = thread->osthread()->thread_handle(); 2852#ifdef _M_IA64 2853 assert(0, "Fix get_thread_pc"); 2854 return ExtendedPC(NULL); 2855#else 2856 if (GetThreadContext(handle, &context)) { 2857#ifdef _M_AMD64 2858 return ExtendedPC((address) context.Rip); 2859#else 2860 return ExtendedPC((address) context.Eip); 2861#endif 2862 } else { 2863 return ExtendedPC(NULL); 2864 } 2865#endif 2866} 2867 2868// GetCurrentThreadId() returns DWORD 2869intx os::current_thread_id() { return GetCurrentThreadId(); } 2870 2871static int _initial_pid = 0; 2872 2873int os::current_process_id() 2874{ 2875 return (_initial_pid ? _initial_pid : _getpid()); 2876} 2877 2878int os::win32::_vm_page_size = 0; 2879int os::win32::_vm_allocation_granularity = 0; 2880int os::win32::_processor_type = 0; 2881// Processor level is not available on non-NT systems, use vm_version instead 2882int os::win32::_processor_level = 0; 2883julong os::win32::_physical_memory = 0; 2884size_t os::win32::_default_stack_size = 0; 2885 2886 intx os::win32::_os_thread_limit = 0; 2887volatile intx os::win32::_os_thread_count = 0; 2888 2889bool os::win32::_is_nt = false; 2890 2891 2892void os::win32::initialize_system_info() { 2893 SYSTEM_INFO si; 2894 GetSystemInfo(&si); 2895 _vm_page_size = si.dwPageSize; 2896 _vm_allocation_granularity = si.dwAllocationGranularity; 2897 _processor_type = si.dwProcessorType; 2898 _processor_level = si.wProcessorLevel; 2899 _processor_count = si.dwNumberOfProcessors; 2900 2901 MEMORYSTATUS ms; 2902 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 2903 // dwMemoryLoad (% of memory in use) 2904 GlobalMemoryStatus(&ms); 2905 _physical_memory = ms.dwTotalPhys; 2906 2907 OSVERSIONINFO oi; 2908 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); 2909 GetVersionEx(&oi); 2910 switch(oi.dwPlatformId) { 2911 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 2912 case VER_PLATFORM_WIN32_NT: _is_nt = true; break; 2913 default: fatal("Unknown platform"); 2914 } 2915 2916 _default_stack_size = os::current_stack_size(); 2917 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 2918 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 2919 "stack size not a multiple of page size"); 2920 2921 initialize_performance_counter(); 2922 2923 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is 2924 // known to deadlock the system, if the VM issues to thread operations with 2925 // a too high frequency, e.g., such as changing the priorities. 2926 // The 6000 seems to work well - no deadlocks has been notices on the test 2927 // programs that we have seen experience this problem. 2928 if (!os::win32::is_nt()) { 2929 StarvationMonitorInterval = 6000; 2930 } 2931} 2932 2933 2934void os::win32::setmode_streams() { 2935 _setmode(_fileno(stdin), _O_BINARY); 2936 _setmode(_fileno(stdout), _O_BINARY); 2937 _setmode(_fileno(stderr), _O_BINARY); 2938} 2939 2940 2941int os::message_box(const char* title, const char* message) { 2942 int result = MessageBox(NULL, message, title, 2943 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 2944 return result == IDYES; 2945} 2946 2947int os::allocate_thread_local_storage() { 2948 return TlsAlloc(); 2949} 2950 2951 2952void os::free_thread_local_storage(int index) { 2953 TlsFree(index); 2954} 2955 2956 2957void os::thread_local_storage_at_put(int index, void* value) { 2958 TlsSetValue(index, value); 2959 assert(thread_local_storage_at(index) == value, "Just checking"); 2960} 2961 2962 2963void* os::thread_local_storage_at(int index) { 2964 return TlsGetValue(index); 2965} 2966 2967 2968#ifndef PRODUCT 2969#ifndef _WIN64 2970// Helpers to check whether NX protection is enabled 2971int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 2972 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 2973 pex->ExceptionRecord->NumberParameters > 0 && 2974 pex->ExceptionRecord->ExceptionInformation[0] == 2975 EXCEPTION_INFO_EXEC_VIOLATION) { 2976 return EXCEPTION_EXECUTE_HANDLER; 2977 } 2978 return EXCEPTION_CONTINUE_SEARCH; 2979} 2980 2981void nx_check_protection() { 2982 // If NX is enabled we'll get an exception calling into code on the stack 2983 char code[] = { (char)0xC3 }; // ret 2984 void *code_ptr = (void *)code; 2985 __try { 2986 __asm call code_ptr 2987 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 2988 tty->print_raw_cr("NX protection detected."); 2989 } 2990} 2991#endif // _WIN64 2992#endif // PRODUCT 2993 2994// this is called _before_ the global arguments have been parsed 2995void os::init(void) { 2996 _initial_pid = _getpid(); 2997 2998 init_random(1234567); 2999 3000 win32::initialize_system_info(); 3001 win32::setmode_streams(); 3002 init_page_sizes((size_t) win32::vm_page_size()); 3003 3004 // For better scalability on MP systems (must be called after initialize_system_info) 3005#ifndef PRODUCT 3006 if (is_MP()) { 3007 NoYieldsInMicrolock = true; 3008 } 3009#endif 3010 // Initialize main_process and main_thread 3011 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 3012 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 3013 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 3014 fatal("DuplicateHandle failed\n"); 3015 } 3016 main_thread_id = (int) GetCurrentThreadId(); 3017} 3018 3019// To install functions for atexit processing 3020extern "C" { 3021 static void perfMemory_exit_helper() { 3022 perfMemory_exit(); 3023 } 3024} 3025 3026 3027// this is called _after_ the global arguments have been parsed 3028jint os::init_2(void) { 3029 // Allocate a single page and mark it as readable for safepoint polling 3030 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 3031 guarantee( polling_page != NULL, "Reserve Failed for polling page"); 3032 3033 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 3034 guarantee( return_page != NULL, "Commit Failed for polling page"); 3035 3036 os::set_polling_page( polling_page ); 3037 3038#ifndef PRODUCT 3039 if( Verbose && PrintMiscellaneous ) 3040 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 3041#endif 3042 3043 if (!UseMembar) { 3044 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_EXECUTE_READWRITE); 3045 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 3046 3047 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_EXECUTE_READWRITE); 3048 guarantee( return_page != NULL, "Commit Failed for memory serialize page"); 3049 3050 os::set_memory_serialize_page( mem_serialize_page ); 3051 3052#ifndef PRODUCT 3053 if(Verbose && PrintMiscellaneous) 3054 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3055#endif 3056} 3057 3058 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init()); 3059 3060 // Setup Windows Exceptions 3061 3062 // On Itanium systems, Structured Exception Handling does not 3063 // work since stack frames must be walkable by the OS. Since 3064 // much of our code is dynamically generated, and we do not have 3065 // proper unwind .xdata sections, the system simply exits 3066 // rather than delivering the exception. To work around 3067 // this we use VectorExceptions instead. 3068#ifdef _WIN64 3069 if (UseVectoredExceptions) { 3070 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter); 3071 } 3072#endif 3073 3074 // for debugging float code generation bugs 3075 if (ForceFloatExceptions) { 3076#ifndef _WIN64 3077 static long fp_control_word = 0; 3078 __asm { fstcw fp_control_word } 3079 // see Intel PPro Manual, Vol. 2, p 7-16 3080 const long precision = 0x20; 3081 const long underflow = 0x10; 3082 const long overflow = 0x08; 3083 const long zero_div = 0x04; 3084 const long denorm = 0x02; 3085 const long invalid = 0x01; 3086 fp_control_word |= invalid; 3087 __asm { fldcw fp_control_word } 3088#endif 3089 } 3090 3091 // Initialize HPI. 3092 jint hpi_result = hpi::initialize(); 3093 if (hpi_result != JNI_OK) { return hpi_result; } 3094 3095 // If stack_commit_size is 0, windows will reserve the default size, 3096 // but only commit a small portion of it. 3097 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 3098 size_t default_reserve_size = os::win32::default_stack_size(); 3099 size_t actual_reserve_size = stack_commit_size; 3100 if (stack_commit_size < default_reserve_size) { 3101 // If stack_commit_size == 0, we want this too 3102 actual_reserve_size = default_reserve_size; 3103 } 3104 3105 JavaThread::set_stack_size_at_create(stack_commit_size); 3106 3107 // Calculate theoretical max. size of Threads to guard gainst artifical 3108 // out-of-memory situations, where all available address-space has been 3109 // reserved by thread stacks. 3110 assert(actual_reserve_size != 0, "Must have a stack"); 3111 3112 // Calculate the thread limit when we should start doing Virtual Memory 3113 // banging. Currently when the threads will have used all but 200Mb of space. 3114 // 3115 // TODO: consider performing a similar calculation for commit size instead 3116 // as reserve size, since on a 64-bit platform we'll run into that more 3117 // often than running out of virtual memory space. We can use the 3118 // lower value of the two calculations as the os_thread_limit. 3119 size_t max_address_space = ((size_t)1 << (BitsPerOop - 1)) - (200 * K * K); 3120 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 3121 3122 // at exit methods are called in the reverse order of their registration. 3123 // there is no limit to the number of functions registered. atexit does 3124 // not set errno. 3125 3126 if (PerfAllowAtExitRegistration) { 3127 // only register atexit functions if PerfAllowAtExitRegistration is set. 3128 // atexit functions can be delayed until process exit time, which 3129 // can be problematic for embedded VM situations. Embedded VMs should 3130 // call DestroyJavaVM() to assure that VM resources are released. 3131 3132 // note: perfMemory_exit_helper atexit function may be removed in 3133 // the future if the appropriate cleanup code can be added to the 3134 // VM_Exit VMOperation's doit method. 3135 if (atexit(perfMemory_exit_helper) != 0) { 3136 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3137 } 3138 } 3139 3140 // initialize PSAPI or ToolHelp for fatal error handler 3141 if (win32::is_nt()) _init_psapi(); 3142 else _init_toolhelp(); 3143 3144#ifndef _WIN64 3145 // Print something if NX is enabled (win32 on AMD64) 3146 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 3147#endif 3148 3149 // initialize thread priority policy 3150 prio_init(); 3151 3152 return JNI_OK; 3153} 3154 3155 3156// Mark the polling page as unreadable 3157void os::make_polling_page_unreadable(void) { 3158 DWORD old_status; 3159 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) ) 3160 fatal("Could not disable polling page"); 3161}; 3162 3163// Mark the polling page as readable 3164void os::make_polling_page_readable(void) { 3165 DWORD old_status; 3166 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) ) 3167 fatal("Could not enable polling page"); 3168}; 3169 3170 3171int os::stat(const char *path, struct stat *sbuf) { 3172 char pathbuf[MAX_PATH]; 3173 if (strlen(path) > MAX_PATH - 1) { 3174 errno = ENAMETOOLONG; 3175 return -1; 3176 } 3177 hpi::native_path(strcpy(pathbuf, path)); 3178 int ret = ::stat(pathbuf, sbuf); 3179 if (sbuf != NULL && UseUTCFileTimestamp) { 3180 // Fix for 6539723. st_mtime returned from stat() is dependent on 3181 // the system timezone and so can return different values for the 3182 // same file if/when daylight savings time changes. This adjustment 3183 // makes sure the same timestamp is returned regardless of the TZ. 3184 // 3185 // See: 3186 // http://msdn.microsoft.com/library/ 3187 // default.asp?url=/library/en-us/sysinfo/base/ 3188 // time_zone_information_str.asp 3189 // and 3190 // http://msdn.microsoft.com/library/default.asp?url= 3191 // /library/en-us/sysinfo/base/settimezoneinformation.asp 3192 // 3193 // NOTE: there is a insidious bug here: If the timezone is changed 3194 // after the call to stat() but before 'GetTimeZoneInformation()', then 3195 // the adjustment we do here will be wrong and we'll return the wrong 3196 // value (which will likely end up creating an invalid class data 3197 // archive). Absent a better API for this, or some time zone locking 3198 // mechanism, we'll have to live with this risk. 3199 TIME_ZONE_INFORMATION tz; 3200 DWORD tzid = GetTimeZoneInformation(&tz); 3201 int daylightBias = 3202 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 3203 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 3204 } 3205 return ret; 3206} 3207 3208 3209#define FT2INT64(ft) \ 3210 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 3211 3212 3213// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3214// are used by JVM M&M and JVMTI to get user+sys or user CPU time 3215// of a thread. 3216// 3217// current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3218// the fast estimate available on the platform. 3219 3220// current_thread_cpu_time() is not optimized for Windows yet 3221jlong os::current_thread_cpu_time() { 3222 // return user + sys since the cost is the same 3223 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 3224} 3225 3226jlong os::thread_cpu_time(Thread* thread) { 3227 // consistent with what current_thread_cpu_time() returns. 3228 return os::thread_cpu_time(thread, true /* user+sys */); 3229} 3230 3231jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3232 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3233} 3234 3235jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 3236 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 3237 // If this function changes, os::is_thread_cpu_time_supported() should too 3238 if (os::win32::is_nt()) { 3239 FILETIME CreationTime; 3240 FILETIME ExitTime; 3241 FILETIME KernelTime; 3242 FILETIME UserTime; 3243 3244 if ( GetThreadTimes(thread->osthread()->thread_handle(), 3245 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 3246 return -1; 3247 else 3248 if (user_sys_cpu_time) { 3249 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 3250 } else { 3251 return FT2INT64(UserTime) * 100; 3252 } 3253 } else { 3254 return (jlong) timeGetTime() * 1000000; 3255 } 3256} 3257 3258void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3259 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 3260 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 3261 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 3262 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3263} 3264 3265void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3266 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 3267 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 3268 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 3269 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3270} 3271 3272bool os::is_thread_cpu_time_supported() { 3273 // see os::thread_cpu_time 3274 if (os::win32::is_nt()) { 3275 FILETIME CreationTime; 3276 FILETIME ExitTime; 3277 FILETIME KernelTime; 3278 FILETIME UserTime; 3279 3280 if ( GetThreadTimes(GetCurrentThread(), 3281 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 3282 return false; 3283 else 3284 return true; 3285 } else { 3286 return false; 3287 } 3288} 3289 3290// Windows does't provide a loadavg primitive so this is stubbed out for now. 3291// It does have primitives (PDH API) to get CPU usage and run queue length. 3292// "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 3293// If we wanted to implement loadavg on Windows, we have a few options: 3294// 3295// a) Query CPU usage and run queue length and "fake" an answer by 3296// returning the CPU usage if it's under 100%, and the run queue 3297// length otherwise. It turns out that querying is pretty slow 3298// on Windows, on the order of 200 microseconds on a fast machine. 3299// Note that on the Windows the CPU usage value is the % usage 3300// since the last time the API was called (and the first call 3301// returns 100%), so we'd have to deal with that as well. 3302// 3303// b) Sample the "fake" answer using a sampling thread and store 3304// the answer in a global variable. The call to loadavg would 3305// just return the value of the global, avoiding the slow query. 3306// 3307// c) Sample a better answer using exponential decay to smooth the 3308// value. This is basically the algorithm used by UNIX kernels. 3309// 3310// Note that sampling thread starvation could affect both (b) and (c). 3311int os::loadavg(double loadavg[], int nelem) { 3312 return -1; 3313} 3314 3315 3316// DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 3317bool os::dont_yield() { 3318 return DontYieldALot; 3319} 3320 3321// Is a (classpath) directory empty? 3322bool os::dir_is_empty(const char* path) { 3323 WIN32_FIND_DATA fd; 3324 HANDLE f = FindFirstFile(path, &fd); 3325 if (f == INVALID_HANDLE_VALUE) { 3326 return true; 3327 } 3328 FindClose(f); 3329 return false; 3330} 3331 3332// create binary file, rewriting existing file if required 3333int os::create_binary_file(const char* path, bool rewrite_existing) { 3334 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 3335 if (!rewrite_existing) { 3336 oflags |= _O_EXCL; 3337 } 3338 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 3339} 3340 3341// return current position of file pointer 3342jlong os::current_file_offset(int fd) { 3343 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 3344} 3345 3346// move file pointer to the specified offset 3347jlong os::seek_to_file_offset(int fd, jlong offset) { 3348 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 3349} 3350 3351 3352// Map a block of memory. 3353char* os::map_memory(int fd, const char* file_name, size_t file_offset, 3354 char *addr, size_t bytes, bool read_only, 3355 bool allow_exec) { 3356 HANDLE hFile; 3357 char* base; 3358 3359 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 3360 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 3361 if (hFile == NULL) { 3362 if (PrintMiscellaneous && Verbose) { 3363 DWORD err = GetLastError(); 3364 tty->print_cr("CreateFile() failed: GetLastError->%ld."); 3365 } 3366 return NULL; 3367 } 3368 3369 if (allow_exec) { 3370 // CreateFileMapping/MapViewOfFileEx can't map executable memory 3371 // unless it comes from a PE image (which the shared archive is not.) 3372 // Even VirtualProtect refuses to give execute access to mapped memory 3373 // that was not previously executable. 3374 // 3375 // Instead, stick the executable region in anonymous memory. Yuck. 3376 // Penalty is that ~4 pages will not be shareable - in the future 3377 // we might consider DLLizing the shared archive with a proper PE 3378 // header so that mapping executable + sharing is possible. 3379 3380 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 3381 PAGE_READWRITE); 3382 if (base == NULL) { 3383 if (PrintMiscellaneous && Verbose) { 3384 DWORD err = GetLastError(); 3385 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 3386 } 3387 CloseHandle(hFile); 3388 return NULL; 3389 } 3390 3391 DWORD bytes_read; 3392 OVERLAPPED overlapped; 3393 overlapped.Offset = (DWORD)file_offset; 3394 overlapped.OffsetHigh = 0; 3395 overlapped.hEvent = NULL; 3396 // ReadFile guarantees that if the return value is true, the requested 3397 // number of bytes were read before returning. 3398 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 3399 if (!res) { 3400 if (PrintMiscellaneous && Verbose) { 3401 DWORD err = GetLastError(); 3402 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 3403 } 3404 release_memory(base, bytes); 3405 CloseHandle(hFile); 3406 return NULL; 3407 } 3408 } else { 3409 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 3410 NULL /*file_name*/); 3411 if (hMap == NULL) { 3412 if (PrintMiscellaneous && Verbose) { 3413 DWORD err = GetLastError(); 3414 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld."); 3415 } 3416 CloseHandle(hFile); 3417 return NULL; 3418 } 3419 3420 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 3421 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 3422 (DWORD)bytes, addr); 3423 if (base == NULL) { 3424 if (PrintMiscellaneous && Verbose) { 3425 DWORD err = GetLastError(); 3426 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 3427 } 3428 CloseHandle(hMap); 3429 CloseHandle(hFile); 3430 return NULL; 3431 } 3432 3433 if (CloseHandle(hMap) == 0) { 3434 if (PrintMiscellaneous && Verbose) { 3435 DWORD err = GetLastError(); 3436 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 3437 } 3438 CloseHandle(hFile); 3439 return base; 3440 } 3441 } 3442 3443 if (allow_exec) { 3444 DWORD old_protect; 3445 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 3446 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 3447 3448 if (!res) { 3449 if (PrintMiscellaneous && Verbose) { 3450 DWORD err = GetLastError(); 3451 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 3452 } 3453 // Don't consider this a hard error, on IA32 even if the 3454 // VirtualProtect fails, we should still be able to execute 3455 CloseHandle(hFile); 3456 return base; 3457 } 3458 } 3459 3460 if (CloseHandle(hFile) == 0) { 3461 if (PrintMiscellaneous && Verbose) { 3462 DWORD err = GetLastError(); 3463 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 3464 } 3465 return base; 3466 } 3467 3468 return base; 3469} 3470 3471 3472// Remap a block of memory. 3473char* os::remap_memory(int fd, const char* file_name, size_t file_offset, 3474 char *addr, size_t bytes, bool read_only, 3475 bool allow_exec) { 3476 // This OS does not allow existing memory maps to be remapped so we 3477 // have to unmap the memory before we remap it. 3478 if (!os::unmap_memory(addr, bytes)) { 3479 return NULL; 3480 } 3481 3482 // There is a very small theoretical window between the unmap_memory() 3483 // call above and the map_memory() call below where a thread in native 3484 // code may be able to access an address that is no longer mapped. 3485 3486 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3487 allow_exec); 3488} 3489 3490 3491// Unmap a block of memory. 3492// Returns true=success, otherwise false. 3493 3494bool os::unmap_memory(char* addr, size_t bytes) { 3495 BOOL result = UnmapViewOfFile(addr); 3496 if (result == 0) { 3497 if (PrintMiscellaneous && Verbose) { 3498 DWORD err = GetLastError(); 3499 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 3500 } 3501 return false; 3502 } 3503 return true; 3504} 3505 3506void os::pause() { 3507 char filename[MAX_PATH]; 3508 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 3509 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 3510 } else { 3511 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 3512 } 3513 3514 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 3515 if (fd != -1) { 3516 struct stat buf; 3517 close(fd); 3518 while (::stat(filename, &buf) == 0) { 3519 Sleep(100); 3520 } 3521 } else { 3522 jio_fprintf(stderr, 3523 "Could not open pause file '%s', continuing immediately.\n", filename); 3524 } 3525} 3526 3527// An Event wraps a win32 "CreateEvent" kernel handle. 3528// 3529// We have a number of choices regarding "CreateEvent" win32 handle leakage: 3530// 3531// 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 3532// field, and call CloseHandle() on the win32 event handle. Unpark() would 3533// need to be modified to tolerate finding a NULL (invalid) win32 event handle. 3534// In addition, an unpark() operation might fetch the handle field, but the 3535// event could recycle between the fetch and the SetEvent() operation. 3536// SetEvent() would either fail because the handle was invalid, or inadvertently work, 3537// as the win32 handle value had been recycled. In an ideal world calling SetEvent() 3538// on an stale but recycled handle would be harmless, but in practice this might 3539// confuse other non-Sun code, so it's not a viable approach. 3540// 3541// 2: Once a win32 event handle is associated with an Event, it remains associated 3542// with the Event. The event handle is never closed. This could be construed 3543// as handle leakage, but only up to the maximum # of threads that have been extant 3544// at any one time. This shouldn't be an issue, as windows platforms typically 3545// permit a process to have hundreds of thousands of open handles. 3546// 3547// 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 3548// and release unused handles. 3549// 3550// 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 3551// It's not clear, however, that we wouldn't be trading one type of leak for another. 3552// 3553// 5. Use an RCU-like mechanism (Read-Copy Update). 3554// Or perhaps something similar to Maged Michael's "Hazard pointers". 3555// 3556// We use (2). 3557// 3558// TODO-FIXME: 3559// 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 3560// 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 3561// to recover from (or at least detect) the dreaded Windows 841176 bug. 3562// 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 3563// into a single win32 CreateEvent() handle. 3564// 3565// _Event transitions in park() 3566// -1 => -1 : illegal 3567// 1 => 0 : pass - return immediately 3568// 0 => -1 : block 3569// 3570// _Event serves as a restricted-range semaphore : 3571// -1 : thread is blocked 3572// 0 : neutral - thread is running or ready 3573// 1 : signaled - thread is running or ready 3574// 3575// Another possible encoding of _Event would be 3576// with explicit "PARKED" and "SIGNALED" bits. 3577 3578int os::PlatformEvent::park (jlong Millis) { 3579 guarantee (_ParkHandle != NULL , "Invariant") ; 3580 guarantee (Millis > 0 , "Invariant") ; 3581 int v ; 3582 3583 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 3584 // the initial park() operation. 3585 3586 for (;;) { 3587 v = _Event ; 3588 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 3589 } 3590 guarantee ((v == 0) || (v == 1), "invariant") ; 3591 if (v != 0) return OS_OK ; 3592 3593 // Do this the hard way by blocking ... 3594 // TODO: consider a brief spin here, gated on the success of recent 3595 // spin attempts by this thread. 3596 // 3597 // We decompose long timeouts into series of shorter timed waits. 3598 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 3599 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 3600 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 3601 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 3602 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 3603 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 3604 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 3605 // for the already waited time. This policy does not admit any new outcomes. 3606 // In the future, however, we might want to track the accumulated wait time and 3607 // adjust Millis accordingly if we encounter a spurious wakeup. 3608 3609 const int MAXTIMEOUT = 0x10000000 ; 3610 DWORD rv = WAIT_TIMEOUT ; 3611 while (_Event < 0 && Millis > 0) { 3612 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT) 3613 if (Millis > MAXTIMEOUT) { 3614 prd = MAXTIMEOUT ; 3615 } 3616 rv = ::WaitForSingleObject (_ParkHandle, prd) ; 3617 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ; 3618 if (rv == WAIT_TIMEOUT) { 3619 Millis -= prd ; 3620 } 3621 } 3622 v = _Event ; 3623 _Event = 0 ; 3624 OrderAccess::fence() ; 3625 // If we encounter a nearly simultanous timeout expiry and unpark() 3626 // we return OS_OK indicating we awoke via unpark(). 3627 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 3628 return (v >= 0) ? OS_OK : OS_TIMEOUT ; 3629} 3630 3631void os::PlatformEvent::park () { 3632 guarantee (_ParkHandle != NULL, "Invariant") ; 3633 // Invariant: Only the thread associated with the Event/PlatformEvent 3634 // may call park(). 3635 int v ; 3636 for (;;) { 3637 v = _Event ; 3638 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 3639 } 3640 guarantee ((v == 0) || (v == 1), "invariant") ; 3641 if (v != 0) return ; 3642 3643 // Do this the hard way by blocking ... 3644 // TODO: consider a brief spin here, gated on the success of recent 3645 // spin attempts by this thread. 3646 while (_Event < 0) { 3647 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ; 3648 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ; 3649 } 3650 3651 // Usually we'll find _Event == 0 at this point, but as 3652 // an optional optimization we clear it, just in case can 3653 // multiple unpark() operations drove _Event up to 1. 3654 _Event = 0 ; 3655 OrderAccess::fence() ; 3656 guarantee (_Event >= 0, "invariant") ; 3657} 3658 3659void os::PlatformEvent::unpark() { 3660 guarantee (_ParkHandle != NULL, "Invariant") ; 3661 int v ; 3662 for (;;) { 3663 v = _Event ; // Increment _Event if it's < 1. 3664 if (v > 0) { 3665 // If it's already signaled just return. 3666 // The LD of _Event could have reordered or be satisfied 3667 // by a read-aside from this processor's write buffer. 3668 // To avoid problems execute a barrier and then 3669 // ratify the value. A degenerate CAS() would also work. 3670 // Viz., CAS (v+0, &_Event, v) == v). 3671 OrderAccess::fence() ; 3672 if (_Event == v) return ; 3673 continue ; 3674 } 3675 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; 3676 } 3677 if (v < 0) { 3678 ::SetEvent (_ParkHandle) ; 3679 } 3680} 3681 3682 3683// JSR166 3684// ------------------------------------------------------- 3685 3686/* 3687 * The Windows implementation of Park is very straightforward: Basic 3688 * operations on Win32 Events turn out to have the right semantics to 3689 * use them directly. We opportunistically resuse the event inherited 3690 * from Monitor. 3691 */ 3692 3693 3694void Parker::park(bool isAbsolute, jlong time) { 3695 guarantee (_ParkEvent != NULL, "invariant") ; 3696 // First, demultiplex/decode time arguments 3697 if (time < 0) { // don't wait 3698 return; 3699 } 3700 else if (time == 0) { 3701 time = INFINITE; 3702 } 3703 else if (isAbsolute) { 3704 time -= os::javaTimeMillis(); // convert to relative time 3705 if (time <= 0) // already elapsed 3706 return; 3707 } 3708 else { // relative 3709 time /= 1000000; // Must coarsen from nanos to millis 3710 if (time == 0) // Wait for the minimal time unit if zero 3711 time = 1; 3712 } 3713 3714 JavaThread* thread = (JavaThread*)(Thread::current()); 3715 assert(thread->is_Java_thread(), "Must be JavaThread"); 3716 JavaThread *jt = (JavaThread *)thread; 3717 3718 // Don't wait if interrupted or already triggered 3719 if (Thread::is_interrupted(thread, false) || 3720 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 3721 ResetEvent(_ParkEvent); 3722 return; 3723 } 3724 else { 3725 ThreadBlockInVM tbivm(jt); 3726 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 3727 jt->set_suspend_equivalent(); 3728 3729 WaitForSingleObject(_ParkEvent, time); 3730 ResetEvent(_ParkEvent); 3731 3732 // If externally suspended while waiting, re-suspend 3733 if (jt->handle_special_suspend_equivalent_condition()) { 3734 jt->java_suspend_self(); 3735 } 3736 } 3737} 3738 3739void Parker::unpark() { 3740 guarantee (_ParkEvent != NULL, "invariant") ; 3741 SetEvent(_ParkEvent); 3742} 3743 3744// Run the specified command in a separate process. Return its exit value, 3745// or -1 on failure (e.g. can't create a new process). 3746int os::fork_and_exec(char* cmd) { 3747 STARTUPINFO si; 3748 PROCESS_INFORMATION pi; 3749 3750 memset(&si, 0, sizeof(si)); 3751 si.cb = sizeof(si); 3752 memset(&pi, 0, sizeof(pi)); 3753 BOOL rslt = CreateProcess(NULL, // executable name - use command line 3754 cmd, // command line 3755 NULL, // process security attribute 3756 NULL, // thread security attribute 3757 TRUE, // inherits system handles 3758 0, // no creation flags 3759 NULL, // use parent's environment block 3760 NULL, // use parent's starting directory 3761 &si, // (in) startup information 3762 &pi); // (out) process information 3763 3764 if (rslt) { 3765 // Wait until child process exits. 3766 WaitForSingleObject(pi.hProcess, INFINITE); 3767 3768 DWORD exit_code; 3769 GetExitCodeProcess(pi.hProcess, &exit_code); 3770 3771 // Close process and thread handles. 3772 CloseHandle(pi.hProcess); 3773 CloseHandle(pi.hThread); 3774 3775 return (int)exit_code; 3776 } else { 3777 return -1; 3778 } 3779} 3780 3781//-------------------------------------------------------------------------------------------------- 3782// Non-product code 3783 3784static int mallocDebugIntervalCounter = 0; 3785static int mallocDebugCounter = 0; 3786bool os::check_heap(bool force) { 3787 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 3788 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 3789 // Note: HeapValidate executes two hardware breakpoints when it finds something 3790 // wrong; at these points, eax contains the address of the offending block (I think). 3791 // To get to the exlicit error message(s) below, just continue twice. 3792 HANDLE heap = GetProcessHeap(); 3793 { HeapLock(heap); 3794 PROCESS_HEAP_ENTRY phe; 3795 phe.lpData = NULL; 3796 while (HeapWalk(heap, &phe) != 0) { 3797 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 3798 !HeapValidate(heap, 0, phe.lpData)) { 3799 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 3800 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 3801 fatal("corrupted C heap"); 3802 } 3803 } 3804 int err = GetLastError(); 3805 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 3806 fatal1("heap walk aborted with error %d", err); 3807 } 3808 HeapUnlock(heap); 3809 } 3810 mallocDebugIntervalCounter = 0; 3811 } 3812 return true; 3813} 3814 3815 3816#ifndef PRODUCT 3817bool os::find(address addr) { 3818 // Nothing yet 3819 return false; 3820} 3821#endif 3822 3823LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 3824 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 3825 3826 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { 3827 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow(); 3828 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 3829 address addr = (address) exceptionRecord->ExceptionInformation[1]; 3830 3831 if (os::is_memory_serialize_page(thread, addr)) 3832 return EXCEPTION_CONTINUE_EXECUTION; 3833 } 3834 3835 return EXCEPTION_CONTINUE_SEARCH; 3836} 3837 3838static int getLastErrorString(char *buf, size_t len) 3839{ 3840 long errval; 3841 3842 if ((errval = GetLastError()) != 0) 3843 { 3844 /* DOS error */ 3845 size_t n = (size_t)FormatMessage( 3846 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 3847 NULL, 3848 errval, 3849 0, 3850 buf, 3851 (DWORD)len, 3852 NULL); 3853 if (n > 3) { 3854 /* Drop final '.', CR, LF */ 3855 if (buf[n - 1] == '\n') n--; 3856 if (buf[n - 1] == '\r') n--; 3857 if (buf[n - 1] == '.') n--; 3858 buf[n] = '\0'; 3859 } 3860 return (int)n; 3861 } 3862 3863 if (errno != 0) 3864 { 3865 /* C runtime error that has no corresponding DOS error code */ 3866 const char *s = strerror(errno); 3867 size_t n = strlen(s); 3868 if (n >= len) n = len - 1; 3869 strncpy(buf, s, n); 3870 buf[n] = '\0'; 3871 return (int)n; 3872 } 3873 return 0; 3874} 3875