os_windows.cpp revision 647:bd441136a5ce
1/* 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25#ifdef _WIN64 26// Must be at least Windows 2000 or XP to use VectoredExceptions 27#define _WIN32_WINNT 0x500 28#endif 29 30// do not include precompiled header file 31# include "incls/_os_windows.cpp.incl" 32 33#ifdef _DEBUG 34#include <crtdbg.h> 35#endif 36 37 38#include <windows.h> 39#include <sys/types.h> 40#include <sys/stat.h> 41#include <sys/timeb.h> 42#include <objidl.h> 43#include <shlobj.h> 44 45#include <malloc.h> 46#include <signal.h> 47#include <direct.h> 48#include <errno.h> 49#include <fcntl.h> 50#include <io.h> 51#include <process.h> // For _beginthreadex(), _endthreadex() 52#include <imagehlp.h> // For os::dll_address_to_function_name 53 54/* for enumerating dll libraries */ 55#include <tlhelp32.h> 56#include <vdmdbg.h> 57 58// for timer info max values which include all bits 59#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 60 61// For DLL loading/load error detection 62// Values of PE COFF 63#define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c 64#define IMAGE_FILE_SIGNATURE_LENGTH 4 65 66static HANDLE main_process; 67static HANDLE main_thread; 68static int main_thread_id; 69 70static FILETIME process_creation_time; 71static FILETIME process_exit_time; 72static FILETIME process_user_time; 73static FILETIME process_kernel_time; 74 75#ifdef _WIN64 76PVOID topLevelVectoredExceptionHandler = NULL; 77#endif 78 79#ifdef _M_IA64 80#define __CPU__ ia64 81#elif _M_AMD64 82#define __CPU__ amd64 83#else 84#define __CPU__ i486 85#endif 86 87// save DLL module handle, used by GetModuleFileName 88 89HINSTANCE vm_lib_handle; 90static int getLastErrorString(char *buf, size_t len); 91 92BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { 93 switch (reason) { 94 case DLL_PROCESS_ATTACH: 95 vm_lib_handle = hinst; 96 if(ForceTimeHighResolution) 97 timeBeginPeriod(1L); 98 break; 99 case DLL_PROCESS_DETACH: 100 if(ForceTimeHighResolution) 101 timeEndPeriod(1L); 102#ifdef _WIN64 103 if (topLevelVectoredExceptionHandler != NULL) { 104 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler); 105 topLevelVectoredExceptionHandler = NULL; 106 } 107#endif 108 break; 109 default: 110 break; 111 } 112 return true; 113} 114 115static inline double fileTimeAsDouble(FILETIME* time) { 116 const double high = (double) ((unsigned int) ~0); 117 const double split = 10000000.0; 118 double result = (time->dwLowDateTime / split) + 119 time->dwHighDateTime * (high/split); 120 return result; 121} 122 123// Implementation of os 124 125bool os::getenv(const char* name, char* buffer, int len) { 126 int result = GetEnvironmentVariable(name, buffer, len); 127 return result > 0 && result < len; 128} 129 130 131// No setuid programs under Windows. 132bool os::have_special_privileges() { 133 return false; 134} 135 136 137// This method is a periodic task to check for misbehaving JNI applications 138// under CheckJNI, we can add any periodic checks here. 139// For Windows at the moment does nothing 140void os::run_periodic_checks() { 141 return; 142} 143 144#ifndef _WIN64 145LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 146#endif 147void os::init_system_properties_values() { 148 /* sysclasspath, java_home, dll_dir */ 149 { 150 char *home_path; 151 char *dll_path; 152 char *pslash; 153 char *bin = "\\bin"; 154 char home_dir[MAX_PATH]; 155 156 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) { 157 os::jvm_path(home_dir, sizeof(home_dir)); 158 // Found the full path to jvm[_g].dll. 159 // Now cut the path to <java_home>/jre if we can. 160 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */ 161 pslash = strrchr(home_dir, '\\'); 162 if (pslash != NULL) { 163 *pslash = '\0'; /* get rid of \{client|server} */ 164 pslash = strrchr(home_dir, '\\'); 165 if (pslash != NULL) 166 *pslash = '\0'; /* get rid of \bin */ 167 } 168 } 169 170 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1); 171 if (home_path == NULL) 172 return; 173 strcpy(home_path, home_dir); 174 Arguments::set_java_home(home_path); 175 176 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1); 177 if (dll_path == NULL) 178 return; 179 strcpy(dll_path, home_dir); 180 strcat(dll_path, bin); 181 Arguments::set_dll_dir(dll_path); 182 183 if (!set_boot_path('\\', ';')) 184 return; 185 } 186 187 /* library_path */ 188 #define EXT_DIR "\\lib\\ext" 189 #define BIN_DIR "\\bin" 190 #define PACKAGE_DIR "\\Sun\\Java" 191 { 192 /* Win32 library search order (See the documentation for LoadLibrary): 193 * 194 * 1. The directory from which application is loaded. 195 * 2. The current directory 196 * 3. The system wide Java Extensions directory (Java only) 197 * 4. System directory (GetSystemDirectory) 198 * 5. Windows directory (GetWindowsDirectory) 199 * 6. The PATH environment variable 200 */ 201 202 char *library_path; 203 char tmp[MAX_PATH]; 204 char *path_str = ::getenv("PATH"); 205 206 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 207 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10); 208 209 library_path[0] = '\0'; 210 211 GetModuleFileName(NULL, tmp, sizeof(tmp)); 212 *(strrchr(tmp, '\\')) = '\0'; 213 strcat(library_path, tmp); 214 215 strcat(library_path, ";."); 216 217 GetWindowsDirectory(tmp, sizeof(tmp)); 218 strcat(library_path, ";"); 219 strcat(library_path, tmp); 220 strcat(library_path, PACKAGE_DIR BIN_DIR); 221 222 GetSystemDirectory(tmp, sizeof(tmp)); 223 strcat(library_path, ";"); 224 strcat(library_path, tmp); 225 226 GetWindowsDirectory(tmp, sizeof(tmp)); 227 strcat(library_path, ";"); 228 strcat(library_path, tmp); 229 230 if (path_str) { 231 strcat(library_path, ";"); 232 strcat(library_path, path_str); 233 } 234 235 Arguments::set_library_path(library_path); 236 FREE_C_HEAP_ARRAY(char, library_path); 237 } 238 239 /* Default extensions directory */ 240 { 241 char path[MAX_PATH]; 242 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 243 GetWindowsDirectory(path, MAX_PATH); 244 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 245 path, PACKAGE_DIR, EXT_DIR); 246 Arguments::set_ext_dirs(buf); 247 } 248 #undef EXT_DIR 249 #undef BIN_DIR 250 #undef PACKAGE_DIR 251 252 /* Default endorsed standards directory. */ 253 { 254 #define ENDORSED_DIR "\\lib\\endorsed" 255 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR); 256 char * buf = NEW_C_HEAP_ARRAY(char, len); 257 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR); 258 Arguments::set_endorsed_dirs(buf); 259 #undef ENDORSED_DIR 260 } 261 262#ifndef _WIN64 263 SetUnhandledExceptionFilter(Handle_FLT_Exception); 264#endif 265 266 // Done 267 return; 268} 269 270void os::breakpoint() { 271 DebugBreak(); 272} 273 274// Invoked from the BREAKPOINT Macro 275extern "C" void breakpoint() { 276 os::breakpoint(); 277} 278 279// Returns an estimate of the current stack pointer. Result must be guaranteed 280// to point into the calling threads stack, and be no lower than the current 281// stack pointer. 282 283address os::current_stack_pointer() { 284 int dummy; 285 address sp = (address)&dummy; 286 return sp; 287} 288 289// os::current_stack_base() 290// 291// Returns the base of the stack, which is the stack's 292// starting address. This function must be called 293// while running on the stack of the thread being queried. 294 295address os::current_stack_base() { 296 MEMORY_BASIC_INFORMATION minfo; 297 address stack_bottom; 298 size_t stack_size; 299 300 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 301 stack_bottom = (address)minfo.AllocationBase; 302 stack_size = minfo.RegionSize; 303 304 // Add up the sizes of all the regions with the same 305 // AllocationBase. 306 while( 1 ) 307 { 308 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 309 if ( stack_bottom == (address)minfo.AllocationBase ) 310 stack_size += minfo.RegionSize; 311 else 312 break; 313 } 314 315#ifdef _M_IA64 316 // IA64 has memory and register stacks 317 stack_size = stack_size / 2; 318#endif 319 return stack_bottom + stack_size; 320} 321 322size_t os::current_stack_size() { 323 size_t sz; 324 MEMORY_BASIC_INFORMATION minfo; 325 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 326 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 327 return sz; 328} 329 330struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 331 const struct tm* time_struct_ptr = localtime(clock); 332 if (time_struct_ptr != NULL) { 333 *res = *time_struct_ptr; 334 return res; 335 } 336 return NULL; 337} 338 339LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 340 341// Thread start routine for all new Java threads 342static unsigned __stdcall java_start(Thread* thread) { 343 // Try to randomize the cache line index of hot stack frames. 344 // This helps when threads of the same stack traces evict each other's 345 // cache lines. The threads can be either from the same JVM instance, or 346 // from different JVM instances. The benefit is especially true for 347 // processors with hyperthreading technology. 348 static int counter = 0; 349 int pid = os::current_process_id(); 350 _alloca(((pid ^ counter++) & 7) * 128); 351 352 OSThread* osthr = thread->osthread(); 353 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 354 355 if (UseNUMA) { 356 int lgrp_id = os::numa_get_group_id(); 357 if (lgrp_id != -1) { 358 thread->set_lgrp_id(lgrp_id); 359 } 360 } 361 362 363 if (UseVectoredExceptions) { 364 // If we are using vectored exception we don't need to set a SEH 365 thread->run(); 366 } 367 else { 368 // Install a win32 structured exception handler around every thread created 369 // by VM, so VM can genrate error dump when an exception occurred in non- 370 // Java thread (e.g. VM thread). 371 __try { 372 thread->run(); 373 } __except(topLevelExceptionFilter( 374 (_EXCEPTION_POINTERS*)_exception_info())) { 375 // Nothing to do. 376 } 377 } 378 379 // One less thread is executing 380 // When the VMThread gets here, the main thread may have already exited 381 // which frees the CodeHeap containing the Atomic::add code 382 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 383 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); 384 } 385 386 return 0; 387} 388 389static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) { 390 // Allocate the OSThread object 391 OSThread* osthread = new OSThread(NULL, NULL); 392 if (osthread == NULL) return NULL; 393 394 // Initialize support for Java interrupts 395 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 396 if (interrupt_event == NULL) { 397 delete osthread; 398 return NULL; 399 } 400 osthread->set_interrupt_event(interrupt_event); 401 402 // Store info on the Win32 thread into the OSThread 403 osthread->set_thread_handle(thread_handle); 404 osthread->set_thread_id(thread_id); 405 406 if (UseNUMA) { 407 int lgrp_id = os::numa_get_group_id(); 408 if (lgrp_id != -1) { 409 thread->set_lgrp_id(lgrp_id); 410 } 411 } 412 413 // Initial thread state is INITIALIZED, not SUSPENDED 414 osthread->set_state(INITIALIZED); 415 416 return osthread; 417} 418 419 420bool os::create_attached_thread(JavaThread* thread) { 421#ifdef ASSERT 422 thread->verify_not_published(); 423#endif 424 HANDLE thread_h; 425 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 426 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 427 fatal("DuplicateHandle failed\n"); 428 } 429 OSThread* osthread = create_os_thread(thread, thread_h, 430 (int)current_thread_id()); 431 if (osthread == NULL) { 432 return false; 433 } 434 435 // Initial thread state is RUNNABLE 436 osthread->set_state(RUNNABLE); 437 438 thread->set_osthread(osthread); 439 return true; 440} 441 442bool os::create_main_thread(JavaThread* thread) { 443#ifdef ASSERT 444 thread->verify_not_published(); 445#endif 446 if (_starting_thread == NULL) { 447 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 448 if (_starting_thread == NULL) { 449 return false; 450 } 451 } 452 453 // The primordial thread is runnable from the start) 454 _starting_thread->set_state(RUNNABLE); 455 456 thread->set_osthread(_starting_thread); 457 return true; 458} 459 460// Allocate and initialize a new OSThread 461bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 462 unsigned thread_id; 463 464 // Allocate the OSThread object 465 OSThread* osthread = new OSThread(NULL, NULL); 466 if (osthread == NULL) { 467 return false; 468 } 469 470 // Initialize support for Java interrupts 471 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 472 if (interrupt_event == NULL) { 473 delete osthread; 474 return NULL; 475 } 476 osthread->set_interrupt_event(interrupt_event); 477 osthread->set_interrupted(false); 478 479 thread->set_osthread(osthread); 480 481 if (stack_size == 0) { 482 switch (thr_type) { 483 case os::java_thread: 484 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 485 if (JavaThread::stack_size_at_create() > 0) 486 stack_size = JavaThread::stack_size_at_create(); 487 break; 488 case os::compiler_thread: 489 if (CompilerThreadStackSize > 0) { 490 stack_size = (size_t)(CompilerThreadStackSize * K); 491 break; 492 } // else fall through: 493 // use VMThreadStackSize if CompilerThreadStackSize is not defined 494 case os::vm_thread: 495 case os::pgc_thread: 496 case os::cgc_thread: 497 case os::watcher_thread: 498 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 499 break; 500 } 501 } 502 503 // Create the Win32 thread 504 // 505 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 506 // does not specify stack size. Instead, it specifies the size of 507 // initially committed space. The stack size is determined by 508 // PE header in the executable. If the committed "stack_size" is larger 509 // than default value in the PE header, the stack is rounded up to the 510 // nearest multiple of 1MB. For example if the launcher has default 511 // stack size of 320k, specifying any size less than 320k does not 512 // affect the actual stack size at all, it only affects the initial 513 // commitment. On the other hand, specifying 'stack_size' larger than 514 // default value may cause significant increase in memory usage, because 515 // not only the stack space will be rounded up to MB, but also the 516 // entire space is committed upfront. 517 // 518 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 519 // for CreateThread() that can treat 'stack_size' as stack size. However we 520 // are not supposed to call CreateThread() directly according to MSDN 521 // document because JVM uses C runtime library. The good news is that the 522 // flag appears to work with _beginthredex() as well. 523 524#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION 525#define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000) 526#endif 527 528 HANDLE thread_handle = 529 (HANDLE)_beginthreadex(NULL, 530 (unsigned)stack_size, 531 (unsigned (__stdcall *)(void*)) java_start, 532 thread, 533 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, 534 &thread_id); 535 if (thread_handle == NULL) { 536 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again 537 // without the flag. 538 thread_handle = 539 (HANDLE)_beginthreadex(NULL, 540 (unsigned)stack_size, 541 (unsigned (__stdcall *)(void*)) java_start, 542 thread, 543 CREATE_SUSPENDED, 544 &thread_id); 545 } 546 if (thread_handle == NULL) { 547 // Need to clean up stuff we've allocated so far 548 CloseHandle(osthread->interrupt_event()); 549 thread->set_osthread(NULL); 550 delete osthread; 551 return NULL; 552 } 553 554 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); 555 556 // Store info on the Win32 thread into the OSThread 557 osthread->set_thread_handle(thread_handle); 558 osthread->set_thread_id(thread_id); 559 560 // Initial thread state is INITIALIZED, not SUSPENDED 561 osthread->set_state(INITIALIZED); 562 563 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 564 return true; 565} 566 567 568// Free Win32 resources related to the OSThread 569void os::free_thread(OSThread* osthread) { 570 assert(osthread != NULL, "osthread not set"); 571 CloseHandle(osthread->thread_handle()); 572 CloseHandle(osthread->interrupt_event()); 573 delete osthread; 574} 575 576 577static int has_performance_count = 0; 578static jlong first_filetime; 579static jlong initial_performance_count; 580static jlong performance_frequency; 581 582 583jlong as_long(LARGE_INTEGER x) { 584 jlong result = 0; // initialization to avoid warning 585 set_high(&result, x.HighPart); 586 set_low(&result, x.LowPart); 587 return result; 588} 589 590 591jlong os::elapsed_counter() { 592 LARGE_INTEGER count; 593 if (has_performance_count) { 594 QueryPerformanceCounter(&count); 595 return as_long(count) - initial_performance_count; 596 } else { 597 FILETIME wt; 598 GetSystemTimeAsFileTime(&wt); 599 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime); 600 } 601} 602 603 604jlong os::elapsed_frequency() { 605 if (has_performance_count) { 606 return performance_frequency; 607 } else { 608 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601. 609 return 10000000; 610 } 611} 612 613 614julong os::available_memory() { 615 return win32::available_memory(); 616} 617 618julong os::win32::available_memory() { 619 // FIXME: GlobalMemoryStatus() may return incorrect value if total memory 620 // is larger than 4GB 621 MEMORYSTATUS ms; 622 GlobalMemoryStatus(&ms); 623 624 return (julong)ms.dwAvailPhys; 625} 626 627julong os::physical_memory() { 628 return win32::physical_memory(); 629} 630 631julong os::allocatable_physical_memory(julong size) { 632#ifdef _LP64 633 return size; 634#else 635 // Limit to 1400m because of the 2gb address space wall 636 return MIN2(size, (julong)1400*M); 637#endif 638} 639 640// VC6 lacks DWORD_PTR 641#if _MSC_VER < 1300 642typedef UINT_PTR DWORD_PTR; 643#endif 644 645int os::active_processor_count() { 646 DWORD_PTR lpProcessAffinityMask = 0; 647 DWORD_PTR lpSystemAffinityMask = 0; 648 int proc_count = processor_count(); 649 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 650 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 651 // Nof active processors is number of bits in process affinity mask 652 int bitcount = 0; 653 while (lpProcessAffinityMask != 0) { 654 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 655 bitcount++; 656 } 657 return bitcount; 658 } else { 659 return proc_count; 660 } 661} 662 663bool os::distribute_processes(uint length, uint* distribution) { 664 // Not yet implemented. 665 return false; 666} 667 668bool os::bind_to_processor(uint processor_id) { 669 // Not yet implemented. 670 return false; 671} 672 673static void initialize_performance_counter() { 674 LARGE_INTEGER count; 675 if (QueryPerformanceFrequency(&count)) { 676 has_performance_count = 1; 677 performance_frequency = as_long(count); 678 QueryPerformanceCounter(&count); 679 initial_performance_count = as_long(count); 680 } else { 681 has_performance_count = 0; 682 FILETIME wt; 683 GetSystemTimeAsFileTime(&wt); 684 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 685 } 686} 687 688 689double os::elapsedTime() { 690 return (double) elapsed_counter() / (double) elapsed_frequency(); 691} 692 693 694// Windows format: 695// The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 696// Java format: 697// Java standards require the number of milliseconds since 1/1/1970 698 699// Constant offset - calculated using offset() 700static jlong _offset = 116444736000000000; 701// Fake time counter for reproducible results when debugging 702static jlong fake_time = 0; 703 704#ifdef ASSERT 705// Just to be safe, recalculate the offset in debug mode 706static jlong _calculated_offset = 0; 707static int _has_calculated_offset = 0; 708 709jlong offset() { 710 if (_has_calculated_offset) return _calculated_offset; 711 SYSTEMTIME java_origin; 712 java_origin.wYear = 1970; 713 java_origin.wMonth = 1; 714 java_origin.wDayOfWeek = 0; // ignored 715 java_origin.wDay = 1; 716 java_origin.wHour = 0; 717 java_origin.wMinute = 0; 718 java_origin.wSecond = 0; 719 java_origin.wMilliseconds = 0; 720 FILETIME jot; 721 if (!SystemTimeToFileTime(&java_origin, &jot)) { 722 fatal1("Error = %d\nWindows error", GetLastError()); 723 } 724 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 725 _has_calculated_offset = 1; 726 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 727 return _calculated_offset; 728} 729#else 730jlong offset() { 731 return _offset; 732} 733#endif 734 735jlong windows_to_java_time(FILETIME wt) { 736 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 737 return (a - offset()) / 10000; 738} 739 740FILETIME java_to_windows_time(jlong l) { 741 jlong a = (l * 10000) + offset(); 742 FILETIME result; 743 result.dwHighDateTime = high(a); 744 result.dwLowDateTime = low(a); 745 return result; 746} 747 748// For now, we say that Windows does not support vtime. I have no idea 749// whether it can actually be made to (DLD, 9/13/05). 750 751bool os::supports_vtime() { return false; } 752bool os::enable_vtime() { return false; } 753bool os::vtime_enabled() { return false; } 754double os::elapsedVTime() { 755 // better than nothing, but not much 756 return elapsedTime(); 757} 758 759jlong os::javaTimeMillis() { 760 if (UseFakeTimers) { 761 return fake_time++; 762 } else { 763 FILETIME wt; 764 GetSystemTimeAsFileTime(&wt); 765 return windows_to_java_time(wt); 766 } 767} 768 769#define NANOS_PER_SEC CONST64(1000000000) 770#define NANOS_PER_MILLISEC 1000000 771jlong os::javaTimeNanos() { 772 if (!has_performance_count) { 773 return javaTimeMillis() * NANOS_PER_MILLISEC; // the best we can do. 774 } else { 775 LARGE_INTEGER current_count; 776 QueryPerformanceCounter(¤t_count); 777 double current = as_long(current_count); 778 double freq = performance_frequency; 779 jlong time = (jlong)((current/freq) * NANOS_PER_SEC); 780 return time; 781 } 782} 783 784void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 785 if (!has_performance_count) { 786 // javaTimeMillis() doesn't have much percision, 787 // but it is not going to wrap -- so all 64 bits 788 info_ptr->max_value = ALL_64_BITS; 789 790 // this is a wall clock timer, so may skip 791 info_ptr->may_skip_backward = true; 792 info_ptr->may_skip_forward = true; 793 } else { 794 jlong freq = performance_frequency; 795 if (freq < NANOS_PER_SEC) { 796 // the performance counter is 64 bits and we will 797 // be multiplying it -- so no wrap in 64 bits 798 info_ptr->max_value = ALL_64_BITS; 799 } else if (freq > NANOS_PER_SEC) { 800 // use the max value the counter can reach to 801 // determine the max value which could be returned 802 julong max_counter = (julong)ALL_64_BITS; 803 info_ptr->max_value = (jlong)(max_counter / (freq / NANOS_PER_SEC)); 804 } else { 805 // the performance counter is 64 bits and we will 806 // be using it directly -- so no wrap in 64 bits 807 info_ptr->max_value = ALL_64_BITS; 808 } 809 810 // using a counter, so no skipping 811 info_ptr->may_skip_backward = false; 812 info_ptr->may_skip_forward = false; 813 } 814 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 815} 816 817char* os::local_time_string(char *buf, size_t buflen) { 818 SYSTEMTIME st; 819 GetLocalTime(&st); 820 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 821 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 822 return buf; 823} 824 825bool os::getTimesSecs(double* process_real_time, 826 double* process_user_time, 827 double* process_system_time) { 828 HANDLE h_process = GetCurrentProcess(); 829 FILETIME create_time, exit_time, kernel_time, user_time; 830 BOOL result = GetProcessTimes(h_process, 831 &create_time, 832 &exit_time, 833 &kernel_time, 834 &user_time); 835 if (result != 0) { 836 FILETIME wt; 837 GetSystemTimeAsFileTime(&wt); 838 jlong rtc_millis = windows_to_java_time(wt); 839 jlong user_millis = windows_to_java_time(user_time); 840 jlong system_millis = windows_to_java_time(kernel_time); 841 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 842 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); 843 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); 844 return true; 845 } else { 846 return false; 847 } 848} 849 850void os::shutdown() { 851 852 // allow PerfMemory to attempt cleanup of any persistent resources 853 perfMemory_exit(); 854 855 // flush buffered output, finish log files 856 ostream_abort(); 857 858 // Check for abort hook 859 abort_hook_t abort_hook = Arguments::abort_hook(); 860 if (abort_hook != NULL) { 861 abort_hook(); 862 } 863} 864 865void os::abort(bool dump_core) 866{ 867 os::shutdown(); 868 // no core dump on Windows 869 ::exit(1); 870} 871 872// Die immediately, no exit hook, no abort hook, no cleanup. 873void os::die() { 874 _exit(-1); 875} 876 877// Directory routines copied from src/win32/native/java/io/dirent_md.c 878// * dirent_md.c 1.15 00/02/02 879// 880// The declarations for DIR and struct dirent are in jvm_win32.h. 881 882/* Caller must have already run dirname through JVM_NativePath, which removes 883 duplicate slashes and converts all instances of '/' into '\\'. */ 884 885DIR * 886os::opendir(const char *dirname) 887{ 888 assert(dirname != NULL, "just checking"); // hotspot change 889 DIR *dirp = (DIR *)malloc(sizeof(DIR)); 890 DWORD fattr; // hotspot change 891 char alt_dirname[4] = { 0, 0, 0, 0 }; 892 893 if (dirp == 0) { 894 errno = ENOMEM; 895 return 0; 896 } 897 898 /* 899 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it 900 * as a directory in FindFirstFile(). We detect this case here and 901 * prepend the current drive name. 902 */ 903 if (dirname[1] == '\0' && dirname[0] == '\\') { 904 alt_dirname[0] = _getdrive() + 'A' - 1; 905 alt_dirname[1] = ':'; 906 alt_dirname[2] = '\\'; 907 alt_dirname[3] = '\0'; 908 dirname = alt_dirname; 909 } 910 911 dirp->path = (char *)malloc(strlen(dirname) + 5); 912 if (dirp->path == 0) { 913 free(dirp); 914 errno = ENOMEM; 915 return 0; 916 } 917 strcpy(dirp->path, dirname); 918 919 fattr = GetFileAttributes(dirp->path); 920 if (fattr == 0xffffffff) { 921 free(dirp->path); 922 free(dirp); 923 errno = ENOENT; 924 return 0; 925 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 926 free(dirp->path); 927 free(dirp); 928 errno = ENOTDIR; 929 return 0; 930 } 931 932 /* Append "*.*", or possibly "\\*.*", to path */ 933 if (dirp->path[1] == ':' 934 && (dirp->path[2] == '\0' 935 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 936 /* No '\\' needed for cases like "Z:" or "Z:\" */ 937 strcat(dirp->path, "*.*"); 938 } else { 939 strcat(dirp->path, "\\*.*"); 940 } 941 942 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 943 if (dirp->handle == INVALID_HANDLE_VALUE) { 944 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 945 free(dirp->path); 946 free(dirp); 947 errno = EACCES; 948 return 0; 949 } 950 } 951 return dirp; 952} 953 954/* parameter dbuf unused on Windows */ 955 956struct dirent * 957os::readdir(DIR *dirp, dirent *dbuf) 958{ 959 assert(dirp != NULL, "just checking"); // hotspot change 960 if (dirp->handle == INVALID_HANDLE_VALUE) { 961 return 0; 962 } 963 964 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 965 966 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 967 if (GetLastError() == ERROR_INVALID_HANDLE) { 968 errno = EBADF; 969 return 0; 970 } 971 FindClose(dirp->handle); 972 dirp->handle = INVALID_HANDLE_VALUE; 973 } 974 975 return &dirp->dirent; 976} 977 978int 979os::closedir(DIR *dirp) 980{ 981 assert(dirp != NULL, "just checking"); // hotspot change 982 if (dirp->handle != INVALID_HANDLE_VALUE) { 983 if (!FindClose(dirp->handle)) { 984 errno = EBADF; 985 return -1; 986 } 987 dirp->handle = INVALID_HANDLE_VALUE; 988 } 989 free(dirp->path); 990 free(dirp); 991 return 0; 992} 993 994const char* os::dll_file_extension() { return ".dll"; } 995 996const char * os::get_temp_directory() 997{ 998 static char path_buf[MAX_PATH]; 999 if (GetTempPath(MAX_PATH, path_buf)>0) 1000 return path_buf; 1001 else{ 1002 path_buf[0]='\0'; 1003 return path_buf; 1004 } 1005} 1006 1007void os::dll_build_name(char *holder, size_t holderlen, 1008 const char* pname, const char* fname) 1009{ 1010 // copied from libhpi 1011 const size_t pnamelen = pname ? strlen(pname) : 0; 1012 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0; 1013 1014 /* Quietly truncates on buffer overflow. Should be an error. */ 1015 if (pnamelen + strlen(fname) + 10 > holderlen) { 1016 *holder = '\0'; 1017 return; 1018 } 1019 1020 if (pnamelen == 0) { 1021 sprintf(holder, "%s.dll", fname); 1022 } else if (c == ':' || c == '\\') { 1023 sprintf(holder, "%s%s.dll", pname, fname); 1024 } else { 1025 sprintf(holder, "%s\\%s.dll", pname, fname); 1026 } 1027} 1028 1029// Needs to be in os specific directory because windows requires another 1030// header file <direct.h> 1031const char* os::get_current_directory(char *buf, int buflen) { 1032 return _getcwd(buf, buflen); 1033} 1034 1035//----------------------------------------------------------- 1036// Helper functions for fatal error handler 1037 1038// The following library functions are resolved dynamically at runtime: 1039 1040// PSAPI functions, for Windows NT, 2000, XP 1041 1042// psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform 1043// SDK from Microsoft. Here are the definitions copied from psapi.h 1044typedef struct _MODULEINFO { 1045 LPVOID lpBaseOfDll; 1046 DWORD SizeOfImage; 1047 LPVOID EntryPoint; 1048} MODULEINFO, *LPMODULEINFO; 1049 1050static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD ); 1051static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD ); 1052static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD ); 1053 1054// ToolHelp Functions, for Windows 95, 98 and ME 1055 1056static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ; 1057static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ; 1058static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ; 1059 1060bool _has_psapi; 1061bool _psapi_init = false; 1062bool _has_toolhelp; 1063 1064static bool _init_psapi() { 1065 HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ; 1066 if( psapi == NULL ) return false ; 1067 1068 _EnumProcessModules = CAST_TO_FN_PTR( 1069 BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD), 1070 GetProcAddress(psapi, "EnumProcessModules")) ; 1071 _GetModuleFileNameEx = CAST_TO_FN_PTR( 1072 DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD), 1073 GetProcAddress(psapi, "GetModuleFileNameExA")); 1074 _GetModuleInformation = CAST_TO_FN_PTR( 1075 BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD), 1076 GetProcAddress(psapi, "GetModuleInformation")); 1077 1078 _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation); 1079 _psapi_init = true; 1080 return _has_psapi; 1081} 1082 1083static bool _init_toolhelp() { 1084 HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ; 1085 if (kernel32 == NULL) return false ; 1086 1087 _CreateToolhelp32Snapshot = CAST_TO_FN_PTR( 1088 HANDLE(WINAPI *)(DWORD,DWORD), 1089 GetProcAddress(kernel32, "CreateToolhelp32Snapshot")); 1090 _Module32First = CAST_TO_FN_PTR( 1091 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32), 1092 GetProcAddress(kernel32, "Module32First" )); 1093 _Module32Next = CAST_TO_FN_PTR( 1094 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32), 1095 GetProcAddress(kernel32, "Module32Next" )); 1096 1097 _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next); 1098 return _has_toolhelp; 1099} 1100 1101#ifdef _WIN64 1102// Helper routine which returns true if address in 1103// within the NTDLL address space. 1104// 1105static bool _addr_in_ntdll( address addr ) 1106{ 1107 HMODULE hmod; 1108 MODULEINFO minfo; 1109 1110 hmod = GetModuleHandle("NTDLL.DLL"); 1111 if ( hmod == NULL ) return false; 1112 if ( !_GetModuleInformation( GetCurrentProcess(), hmod, 1113 &minfo, sizeof(MODULEINFO)) ) 1114 return false; 1115 1116 if ( (addr >= minfo.lpBaseOfDll) && 1117 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) 1118 return true; 1119 else 1120 return false; 1121} 1122#endif 1123 1124 1125// Enumerate all modules for a given process ID 1126// 1127// Notice that Windows 95/98/Me and Windows NT/2000/XP have 1128// different API for doing this. We use PSAPI.DLL on NT based 1129// Windows and ToolHelp on 95/98/Me. 1130 1131// Callback function that is called by enumerate_modules() on 1132// every DLL module. 1133// Input parameters: 1134// int pid, 1135// char* module_file_name, 1136// address module_base_addr, 1137// unsigned module_size, 1138// void* param 1139typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *); 1140 1141// enumerate_modules for Windows NT, using PSAPI 1142static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param) 1143{ 1144 HANDLE hProcess ; 1145 1146# define MAX_NUM_MODULES 128 1147 HMODULE modules[MAX_NUM_MODULES]; 1148 static char filename[ MAX_PATH ]; 1149 int result = 0; 1150 1151 if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0; 1152 1153 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1154 FALSE, pid ) ; 1155 if (hProcess == NULL) return 0; 1156 1157 DWORD size_needed; 1158 if (!_EnumProcessModules(hProcess, modules, 1159 sizeof(modules), &size_needed)) { 1160 CloseHandle( hProcess ); 1161 return 0; 1162 } 1163 1164 // number of modules that are currently loaded 1165 int num_modules = size_needed / sizeof(HMODULE); 1166 1167 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1168 // Get Full pathname: 1169 if(!_GetModuleFileNameEx(hProcess, modules[i], 1170 filename, sizeof(filename))) { 1171 filename[0] = '\0'; 1172 } 1173 1174 MODULEINFO modinfo; 1175 if (!_GetModuleInformation(hProcess, modules[i], 1176 &modinfo, sizeof(modinfo))) { 1177 modinfo.lpBaseOfDll = NULL; 1178 modinfo.SizeOfImage = 0; 1179 } 1180 1181 // Invoke callback function 1182 result = func(pid, filename, (address)modinfo.lpBaseOfDll, 1183 modinfo.SizeOfImage, param); 1184 if (result) break; 1185 } 1186 1187 CloseHandle( hProcess ) ; 1188 return result; 1189} 1190 1191 1192// enumerate_modules for Windows 95/98/ME, using TOOLHELP 1193static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param) 1194{ 1195 HANDLE hSnapShot ; 1196 static MODULEENTRY32 modentry ; 1197 int result = 0; 1198 1199 if (!_has_toolhelp) return 0; 1200 1201 // Get a handle to a Toolhelp snapshot of the system 1202 hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ; 1203 if( hSnapShot == INVALID_HANDLE_VALUE ) { 1204 return FALSE ; 1205 } 1206 1207 // iterate through all modules 1208 modentry.dwSize = sizeof(MODULEENTRY32) ; 1209 bool not_done = _Module32First( hSnapShot, &modentry ) != 0; 1210 1211 while( not_done ) { 1212 // invoke the callback 1213 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr, 1214 modentry.modBaseSize, param); 1215 if (result) break; 1216 1217 modentry.dwSize = sizeof(MODULEENTRY32) ; 1218 not_done = _Module32Next( hSnapShot, &modentry ) != 0; 1219 } 1220 1221 CloseHandle(hSnapShot); 1222 return result; 1223} 1224 1225int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param ) 1226{ 1227 // Get current process ID if caller doesn't provide it. 1228 if (!pid) pid = os::current_process_id(); 1229 1230 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param); 1231 else return _enumerate_modules_windows(pid, func, param); 1232} 1233 1234struct _modinfo { 1235 address addr; 1236 char* full_path; // point to a char buffer 1237 int buflen; // size of the buffer 1238 address base_addr; 1239}; 1240 1241static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr, 1242 unsigned size, void * param) { 1243 struct _modinfo *pmod = (struct _modinfo *)param; 1244 if (!pmod) return -1; 1245 1246 if (base_addr <= pmod->addr && 1247 base_addr+size > pmod->addr) { 1248 // if a buffer is provided, copy path name to the buffer 1249 if (pmod->full_path) { 1250 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1251 } 1252 pmod->base_addr = base_addr; 1253 return 1; 1254 } 1255 return 0; 1256} 1257 1258bool os::dll_address_to_library_name(address addr, char* buf, 1259 int buflen, int* offset) { 1260// NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1261// return the full path to the DLL file, sometimes it returns path 1262// to the corresponding PDB file (debug info); sometimes it only 1263// returns partial path, which makes life painful. 1264 1265 struct _modinfo mi; 1266 mi.addr = addr; 1267 mi.full_path = buf; 1268 mi.buflen = buflen; 1269 int pid = os::current_process_id(); 1270 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) { 1271 // buf already contains path name 1272 if (offset) *offset = addr - mi.base_addr; 1273 return true; 1274 } else { 1275 if (buf) buf[0] = '\0'; 1276 if (offset) *offset = -1; 1277 return false; 1278 } 1279} 1280 1281bool os::dll_address_to_function_name(address addr, char *buf, 1282 int buflen, int *offset) { 1283 // Unimplemented on Windows - in order to use SymGetSymFromAddr(), 1284 // we need to initialize imagehlp/dbghelp, then load symbol table 1285 // for every module. That's too much work to do after a fatal error. 1286 // For an example on how to implement this function, see 1.4.2. 1287 if (offset) *offset = -1; 1288 if (buf) buf[0] = '\0'; 1289 return false; 1290} 1291 1292void* os::dll_lookup(void* handle, const char* name) { 1293 return GetProcAddress((HMODULE)handle, name); 1294} 1295 1296// save the start and end address of jvm.dll into param[0] and param[1] 1297static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr, 1298 unsigned size, void * param) { 1299 if (!param) return -1; 1300 1301 if (base_addr <= (address)_locate_jvm_dll && 1302 base_addr+size > (address)_locate_jvm_dll) { 1303 ((address*)param)[0] = base_addr; 1304 ((address*)param)[1] = base_addr + size; 1305 return 1; 1306 } 1307 return 0; 1308} 1309 1310address vm_lib_location[2]; // start and end address of jvm.dll 1311 1312// check if addr is inside jvm.dll 1313bool os::address_is_in_vm(address addr) { 1314 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1315 int pid = os::current_process_id(); 1316 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) { 1317 assert(false, "Can't find jvm module."); 1318 return false; 1319 } 1320 } 1321 1322 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1323} 1324 1325// print module info; param is outputStream* 1326static int _print_module(int pid, char* fname, address base, 1327 unsigned size, void* param) { 1328 if (!param) return -1; 1329 1330 outputStream* st = (outputStream*)param; 1331 1332 address end_addr = base + size; 1333 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname); 1334 return 0; 1335} 1336 1337// Loads .dll/.so and 1338// in case of error it checks if .dll/.so was built for the 1339// same architecture as Hotspot is running on 1340void * os::dll_load(const char *name, char *ebuf, int ebuflen) 1341{ 1342 void * result = LoadLibrary(name); 1343 if (result != NULL) 1344 { 1345 return result; 1346 } 1347 1348 long errcode = GetLastError(); 1349 if (errcode == ERROR_MOD_NOT_FOUND) { 1350 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1); 1351 ebuf[ebuflen-1]='\0'; 1352 return NULL; 1353 } 1354 1355 // Parsing dll below 1356 // If we can read dll-info and find that dll was built 1357 // for an architecture other than Hotspot is running in 1358 // - then print to buffer "DLL was built for a different architecture" 1359 // else call getLastErrorString to obtain system error message 1360 1361 // Read system error message into ebuf 1362 // It may or may not be overwritten below (in the for loop and just above) 1363 getLastErrorString(ebuf, (size_t) ebuflen); 1364 ebuf[ebuflen-1]='\0'; 1365 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0); 1366 if (file_descriptor<0) 1367 { 1368 return NULL; 1369 } 1370 1371 uint32_t signature_offset; 1372 uint16_t lib_arch=0; 1373 bool failed_to_get_lib_arch= 1374 ( 1375 //Go to position 3c in the dll 1376 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0) 1377 || 1378 // Read loacation of signature 1379 (sizeof(signature_offset)!= 1380 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset)))) 1381 || 1382 //Go to COFF File Header in dll 1383 //that is located after"signature" (4 bytes long) 1384 (os::seek_to_file_offset(file_descriptor, 1385 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0) 1386 || 1387 //Read field that contains code of architecture 1388 // that dll was build for 1389 (sizeof(lib_arch)!= 1390 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch)))) 1391 ); 1392 1393 ::close(file_descriptor); 1394 if (failed_to_get_lib_arch) 1395 { 1396 // file i/o error - report getLastErrorString(...) msg 1397 return NULL; 1398 } 1399 1400 typedef struct 1401 { 1402 uint16_t arch_code; 1403 char* arch_name; 1404 } arch_t; 1405 1406 static const arch_t arch_array[]={ 1407 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1408 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1409 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1410 }; 1411 #if (defined _M_IA64) 1412 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64; 1413 #elif (defined _M_AMD64) 1414 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64; 1415 #elif (defined _M_IX86) 1416 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386; 1417 #else 1418 #error Method os::dll_load requires that one of following \ 1419 is defined :_M_IA64,_M_AMD64 or _M_IX86 1420 #endif 1421 1422 1423 // Obtain a string for printf operation 1424 // lib_arch_str shall contain string what platform this .dll was built for 1425 // running_arch_str shall string contain what platform Hotspot was built for 1426 char *running_arch_str=NULL,*lib_arch_str=NULL; 1427 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++) 1428 { 1429 if (lib_arch==arch_array[i].arch_code) 1430 lib_arch_str=arch_array[i].arch_name; 1431 if (running_arch==arch_array[i].arch_code) 1432 running_arch_str=arch_array[i].arch_name; 1433 } 1434 1435 assert(running_arch_str, 1436 "Didn't find runing architecture code in arch_array"); 1437 1438 // If the architure is right 1439 // but some other error took place - report getLastErrorString(...) msg 1440 if (lib_arch == running_arch) 1441 { 1442 return NULL; 1443 } 1444 1445 if (lib_arch_str!=NULL) 1446 { 1447 ::_snprintf(ebuf, ebuflen-1, 1448 "Can't load %s-bit .dll on a %s-bit platform", 1449 lib_arch_str,running_arch_str); 1450 } 1451 else 1452 { 1453 // don't know what architecture this dll was build for 1454 ::_snprintf(ebuf, ebuflen-1, 1455 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1456 lib_arch,running_arch_str); 1457 } 1458 1459 return NULL; 1460} 1461 1462 1463void os::print_dll_info(outputStream *st) { 1464 int pid = os::current_process_id(); 1465 st->print_cr("Dynamic libraries:"); 1466 enumerate_modules(pid, _print_module, (void *)st); 1467} 1468 1469// function pointer to Windows API "GetNativeSystemInfo". 1470typedef void (WINAPI *GetNativeSystemInfo_func_type)(LPSYSTEM_INFO); 1471static GetNativeSystemInfo_func_type _GetNativeSystemInfo; 1472 1473void os::print_os_info(outputStream* st) { 1474 st->print("OS:"); 1475 1476 OSVERSIONINFOEX osvi; 1477 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1478 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1479 1480 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1481 st->print_cr("N/A"); 1482 return; 1483 } 1484 1485 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion; 1486 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) { 1487 switch (os_vers) { 1488 case 3051: st->print(" Windows NT 3.51"); break; 1489 case 4000: st->print(" Windows NT 4.0"); break; 1490 case 5000: st->print(" Windows 2000"); break; 1491 case 5001: st->print(" Windows XP"); break; 1492 case 5002: 1493 case 6000: { 1494 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1495 // find out whether we are running on 64 bit processor or not. 1496 SYSTEM_INFO si; 1497 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1498 // Check to see if _GetNativeSystemInfo has been initialized. 1499 if (_GetNativeSystemInfo == NULL) { 1500 HMODULE hKernel32 = GetModuleHandle(TEXT("kernel32.dll")); 1501 _GetNativeSystemInfo = 1502 CAST_TO_FN_PTR(GetNativeSystemInfo_func_type, 1503 GetProcAddress(hKernel32, 1504 "GetNativeSystemInfo")); 1505 if (_GetNativeSystemInfo == NULL) 1506 GetSystemInfo(&si); 1507 } else { 1508 _GetNativeSystemInfo(&si); 1509 } 1510 if (os_vers == 5002) { 1511 if (osvi.wProductType == VER_NT_WORKSTATION && 1512 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) 1513 st->print(" Windows XP x64 Edition"); 1514 else 1515 st->print(" Windows Server 2003 family"); 1516 } else { // os_vers == 6000 1517 if (osvi.wProductType == VER_NT_WORKSTATION) 1518 st->print(" Windows Vista"); 1519 else 1520 st->print(" Windows Server 2008"); 1521 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) 1522 st->print(" , 64 bit"); 1523 } 1524 break; 1525 } 1526 default: // future windows, print out its major and minor versions 1527 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1528 } 1529 } else { 1530 switch (os_vers) { 1531 case 4000: st->print(" Windows 95"); break; 1532 case 4010: st->print(" Windows 98"); break; 1533 case 4090: st->print(" Windows Me"); break; 1534 default: // future windows, print out its major and minor versions 1535 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1536 } 1537 } 1538 st->print(" Build %d", osvi.dwBuildNumber); 1539 st->print(" %s", osvi.szCSDVersion); // service pack 1540 st->cr(); 1541} 1542 1543void os::print_memory_info(outputStream* st) { 1544 st->print("Memory:"); 1545 st->print(" %dk page", os::vm_page_size()>>10); 1546 1547 // FIXME: GlobalMemoryStatus() may return incorrect value if total memory 1548 // is larger than 4GB 1549 MEMORYSTATUS ms; 1550 GlobalMemoryStatus(&ms); 1551 1552 st->print(", physical %uk", os::physical_memory() >> 10); 1553 st->print("(%uk free)", os::available_memory() >> 10); 1554 1555 st->print(", swap %uk", ms.dwTotalPageFile >> 10); 1556 st->print("(%uk free)", ms.dwAvailPageFile >> 10); 1557 st->cr(); 1558} 1559 1560void os::print_siginfo(outputStream *st, void *siginfo) { 1561 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1562 st->print("siginfo:"); 1563 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1564 1565 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1566 er->NumberParameters >= 2) { 1567 switch (er->ExceptionInformation[0]) { 1568 case 0: st->print(", reading address"); break; 1569 case 1: st->print(", writing address"); break; 1570 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1571 er->ExceptionInformation[0]); 1572 } 1573 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1574 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1575 er->NumberParameters >= 2 && UseSharedSpaces) { 1576 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1577 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1578 st->print("\n\nError accessing class data sharing archive." \ 1579 " Mapped file inaccessible during execution, " \ 1580 " possible disk/network problem."); 1581 } 1582 } else { 1583 int num = er->NumberParameters; 1584 if (num > 0) { 1585 st->print(", ExceptionInformation="); 1586 for (int i = 0; i < num; i++) { 1587 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1588 } 1589 } 1590 } 1591 st->cr(); 1592} 1593 1594void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1595 // do nothing 1596} 1597 1598static char saved_jvm_path[MAX_PATH] = {0}; 1599 1600// Find the full path to the current module, jvm.dll or jvm_g.dll 1601void os::jvm_path(char *buf, jint buflen) { 1602 // Error checking. 1603 if (buflen < MAX_PATH) { 1604 assert(false, "must use a large-enough buffer"); 1605 buf[0] = '\0'; 1606 return; 1607 } 1608 // Lazy resolve the path to current module. 1609 if (saved_jvm_path[0] != 0) { 1610 strcpy(buf, saved_jvm_path); 1611 return; 1612 } 1613 1614 GetModuleFileName(vm_lib_handle, buf, buflen); 1615 strcpy(saved_jvm_path, buf); 1616} 1617 1618 1619void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1620#ifndef _WIN64 1621 st->print("_"); 1622#endif 1623} 1624 1625 1626void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1627#ifndef _WIN64 1628 st->print("@%d", args_size * sizeof(int)); 1629#endif 1630} 1631 1632// sun.misc.Signal 1633// NOTE that this is a workaround for an apparent kernel bug where if 1634// a signal handler for SIGBREAK is installed then that signal handler 1635// takes priority over the console control handler for CTRL_CLOSE_EVENT. 1636// See bug 4416763. 1637static void (*sigbreakHandler)(int) = NULL; 1638 1639static void UserHandler(int sig, void *siginfo, void *context) { 1640 os::signal_notify(sig); 1641 // We need to reinstate the signal handler each time... 1642 os::signal(sig, (void*)UserHandler); 1643} 1644 1645void* os::user_handler() { 1646 return (void*) UserHandler; 1647} 1648 1649void* os::signal(int signal_number, void* handler) { 1650 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1651 void (*oldHandler)(int) = sigbreakHandler; 1652 sigbreakHandler = (void (*)(int)) handler; 1653 return (void*) oldHandler; 1654 } else { 1655 return (void*)::signal(signal_number, (void (*)(int))handler); 1656 } 1657} 1658 1659void os::signal_raise(int signal_number) { 1660 raise(signal_number); 1661} 1662 1663// The Win32 C runtime library maps all console control events other than ^C 1664// into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1665// logoff, and shutdown events. We therefore install our own console handler 1666// that raises SIGTERM for the latter cases. 1667// 1668static BOOL WINAPI consoleHandler(DWORD event) { 1669 switch(event) { 1670 case CTRL_C_EVENT: 1671 if (is_error_reported()) { 1672 // Ctrl-C is pressed during error reporting, likely because the error 1673 // handler fails to abort. Let VM die immediately. 1674 os::die(); 1675 } 1676 1677 os::signal_raise(SIGINT); 1678 return TRUE; 1679 break; 1680 case CTRL_BREAK_EVENT: 1681 if (sigbreakHandler != NULL) { 1682 (*sigbreakHandler)(SIGBREAK); 1683 } 1684 return TRUE; 1685 break; 1686 case CTRL_CLOSE_EVENT: 1687 case CTRL_LOGOFF_EVENT: 1688 case CTRL_SHUTDOWN_EVENT: 1689 os::signal_raise(SIGTERM); 1690 return TRUE; 1691 break; 1692 default: 1693 break; 1694 } 1695 return FALSE; 1696} 1697 1698/* 1699 * The following code is moved from os.cpp for making this 1700 * code platform specific, which it is by its very nature. 1701 */ 1702 1703// Return maximum OS signal used + 1 for internal use only 1704// Used as exit signal for signal_thread 1705int os::sigexitnum_pd(){ 1706 return NSIG; 1707} 1708 1709// a counter for each possible signal value, including signal_thread exit signal 1710static volatile jint pending_signals[NSIG+1] = { 0 }; 1711static HANDLE sig_sem; 1712 1713void os::signal_init_pd() { 1714 // Initialize signal structures 1715 memset((void*)pending_signals, 0, sizeof(pending_signals)); 1716 1717 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 1718 1719 // Programs embedding the VM do not want it to attempt to receive 1720 // events like CTRL_LOGOFF_EVENT, which are used to implement the 1721 // shutdown hooks mechanism introduced in 1.3. For example, when 1722 // the VM is run as part of a Windows NT service (i.e., a servlet 1723 // engine in a web server), the correct behavior is for any console 1724 // control handler to return FALSE, not TRUE, because the OS's 1725 // "final" handler for such events allows the process to continue if 1726 // it is a service (while terminating it if it is not a service). 1727 // To make this behavior uniform and the mechanism simpler, we 1728 // completely disable the VM's usage of these console events if -Xrs 1729 // (=ReduceSignalUsage) is specified. This means, for example, that 1730 // the CTRL-BREAK thread dump mechanism is also disabled in this 1731 // case. See bugs 4323062, 4345157, and related bugs. 1732 1733 if (!ReduceSignalUsage) { 1734 // Add a CTRL-C handler 1735 SetConsoleCtrlHandler(consoleHandler, TRUE); 1736 } 1737} 1738 1739void os::signal_notify(int signal_number) { 1740 BOOL ret; 1741 1742 Atomic::inc(&pending_signals[signal_number]); 1743 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 1744 assert(ret != 0, "ReleaseSemaphore() failed"); 1745} 1746 1747static int check_pending_signals(bool wait_for_signal) { 1748 DWORD ret; 1749 while (true) { 1750 for (int i = 0; i < NSIG + 1; i++) { 1751 jint n = pending_signals[i]; 1752 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1753 return i; 1754 } 1755 } 1756 if (!wait_for_signal) { 1757 return -1; 1758 } 1759 1760 JavaThread *thread = JavaThread::current(); 1761 1762 ThreadBlockInVM tbivm(thread); 1763 1764 bool threadIsSuspended; 1765 do { 1766 thread->set_suspend_equivalent(); 1767 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1768 ret = ::WaitForSingleObject(sig_sem, INFINITE); 1769 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 1770 1771 // were we externally suspended while we were waiting? 1772 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1773 if (threadIsSuspended) { 1774 // 1775 // The semaphore has been incremented, but while we were waiting 1776 // another thread suspended us. We don't want to continue running 1777 // while suspended because that would surprise the thread that 1778 // suspended us. 1779 // 1780 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 1781 assert(ret != 0, "ReleaseSemaphore() failed"); 1782 1783 thread->java_suspend_self(); 1784 } 1785 } while (threadIsSuspended); 1786 } 1787} 1788 1789int os::signal_lookup() { 1790 return check_pending_signals(false); 1791} 1792 1793int os::signal_wait() { 1794 return check_pending_signals(true); 1795} 1796 1797// Implicit OS exception handling 1798 1799LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) { 1800 JavaThread* thread = JavaThread::current(); 1801 // Save pc in thread 1802#ifdef _M_IA64 1803 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP); 1804 // Set pc to handler 1805 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 1806#elif _M_AMD64 1807 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip); 1808 // Set pc to handler 1809 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 1810#else 1811 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip); 1812 // Set pc to handler 1813 exceptionInfo->ContextRecord->Eip = (LONG)handler; 1814#endif 1815 1816 // Continue the execution 1817 return EXCEPTION_CONTINUE_EXECUTION; 1818} 1819 1820 1821// Used for PostMortemDump 1822extern "C" void safepoints(); 1823extern "C" void find(int x); 1824extern "C" void events(); 1825 1826// According to Windows API documentation, an illegal instruction sequence should generate 1827// the 0xC000001C exception code. However, real world experience shows that occasionnaly 1828// the execution of an illegal instruction can generate the exception code 0xC000001E. This 1829// seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 1830 1831#define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 1832 1833// From "Execution Protection in the Windows Operating System" draft 0.35 1834// Once a system header becomes available, the "real" define should be 1835// included or copied here. 1836#define EXCEPTION_INFO_EXEC_VIOLATION 0x08 1837 1838#define def_excpt(val) #val, val 1839 1840struct siglabel { 1841 char *name; 1842 int number; 1843}; 1844 1845struct siglabel exceptlabels[] = { 1846 def_excpt(EXCEPTION_ACCESS_VIOLATION), 1847 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 1848 def_excpt(EXCEPTION_BREAKPOINT), 1849 def_excpt(EXCEPTION_SINGLE_STEP), 1850 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 1851 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 1852 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 1853 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 1854 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 1855 def_excpt(EXCEPTION_FLT_OVERFLOW), 1856 def_excpt(EXCEPTION_FLT_STACK_CHECK), 1857 def_excpt(EXCEPTION_FLT_UNDERFLOW), 1858 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 1859 def_excpt(EXCEPTION_INT_OVERFLOW), 1860 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 1861 def_excpt(EXCEPTION_IN_PAGE_ERROR), 1862 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 1863 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 1864 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 1865 def_excpt(EXCEPTION_STACK_OVERFLOW), 1866 def_excpt(EXCEPTION_INVALID_DISPOSITION), 1867 def_excpt(EXCEPTION_GUARD_PAGE), 1868 def_excpt(EXCEPTION_INVALID_HANDLE), 1869 NULL, 0 1870}; 1871 1872const char* os::exception_name(int exception_code, char *buf, size_t size) { 1873 for (int i = 0; exceptlabels[i].name != NULL; i++) { 1874 if (exceptlabels[i].number == exception_code) { 1875 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 1876 return buf; 1877 } 1878 } 1879 1880 return NULL; 1881} 1882 1883//----------------------------------------------------------------------------- 1884LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 1885 // handle exception caused by idiv; should only happen for -MinInt/-1 1886 // (division by zero is handled explicitly) 1887#ifdef _M_IA64 1888 assert(0, "Fix Handle_IDiv_Exception"); 1889#elif _M_AMD64 1890 PCONTEXT ctx = exceptionInfo->ContextRecord; 1891 address pc = (address)ctx->Rip; 1892 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc)); 1893 assert(pc[0] == 0xF7, "not an idiv opcode"); 1894 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 1895 assert(ctx->Rax == min_jint, "unexpected idiv exception"); 1896 // set correct result values and continue after idiv instruction 1897 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 1898 ctx->Rax = (DWORD)min_jint; // result 1899 ctx->Rdx = (DWORD)0; // remainder 1900 // Continue the execution 1901#else 1902 PCONTEXT ctx = exceptionInfo->ContextRecord; 1903 address pc = (address)ctx->Eip; 1904 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc)); 1905 assert(pc[0] == 0xF7, "not an idiv opcode"); 1906 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 1907 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 1908 // set correct result values and continue after idiv instruction 1909 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 1910 ctx->Eax = (DWORD)min_jint; // result 1911 ctx->Edx = (DWORD)0; // remainder 1912 // Continue the execution 1913#endif 1914 return EXCEPTION_CONTINUE_EXECUTION; 1915} 1916 1917#ifndef _WIN64 1918//----------------------------------------------------------------------------- 1919LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 1920 // handle exception caused by native mothod modifying control word 1921 PCONTEXT ctx = exceptionInfo->ContextRecord; 1922 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 1923 1924 switch (exception_code) { 1925 case EXCEPTION_FLT_DENORMAL_OPERAND: 1926 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 1927 case EXCEPTION_FLT_INEXACT_RESULT: 1928 case EXCEPTION_FLT_INVALID_OPERATION: 1929 case EXCEPTION_FLT_OVERFLOW: 1930 case EXCEPTION_FLT_STACK_CHECK: 1931 case EXCEPTION_FLT_UNDERFLOW: 1932 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 1933 if (fp_control_word != ctx->FloatSave.ControlWord) { 1934 // Restore FPCW and mask out FLT exceptions 1935 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 1936 // Mask out pending FLT exceptions 1937 ctx->FloatSave.StatusWord &= 0xffffff00; 1938 return EXCEPTION_CONTINUE_EXECUTION; 1939 } 1940 } 1941 return EXCEPTION_CONTINUE_SEARCH; 1942} 1943#else //_WIN64 1944/* 1945 On Windows, the mxcsr control bits are non-volatile across calls 1946 See also CR 6192333 1947 If EXCEPTION_FLT_* happened after some native method modified 1948 mxcsr - it is not a jvm fault. 1949 However should we decide to restore of mxcsr after a faulty 1950 native method we can uncomment following code 1951 jint MxCsr = INITIAL_MXCSR; 1952 // we can't use StubRoutines::addr_mxcsr_std() 1953 // because in Win64 mxcsr is not saved there 1954 if (MxCsr != ctx->MxCsr) { 1955 ctx->MxCsr = MxCsr; 1956 return EXCEPTION_CONTINUE_EXECUTION; 1957 } 1958 1959*/ 1960#endif //_WIN64 1961 1962 1963// Fatal error reporting is single threaded so we can make this a 1964// static and preallocated. If it's more than MAX_PATH silently ignore 1965// it. 1966static char saved_error_file[MAX_PATH] = {0}; 1967 1968void os::set_error_file(const char *logfile) { 1969 if (strlen(logfile) <= MAX_PATH) { 1970 strncpy(saved_error_file, logfile, MAX_PATH); 1971 } 1972} 1973 1974static inline void report_error(Thread* t, DWORD exception_code, 1975 address addr, void* siginfo, void* context) { 1976 VMError err(t, exception_code, addr, siginfo, context); 1977 err.report_and_die(); 1978 1979 // If UseOsErrorReporting, this will return here and save the error file 1980 // somewhere where we can find it in the minidump. 1981} 1982 1983//----------------------------------------------------------------------------- 1984LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 1985 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 1986 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 1987#ifdef _M_IA64 1988 address pc = (address) exceptionInfo->ContextRecord->StIIP; 1989#elif _M_AMD64 1990 address pc = (address) exceptionInfo->ContextRecord->Rip; 1991#else 1992 address pc = (address) exceptionInfo->ContextRecord->Eip; 1993#endif 1994 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 1995 1996#ifndef _WIN64 1997 // Execution protection violation - win32 running on AMD64 only 1998 // Handled first to avoid misdiagnosis as a "normal" access violation; 1999 // This is safe to do because we have a new/unique ExceptionInformation 2000 // code for this condition. 2001 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2002 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2003 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2004 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2005 2006 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2007 int page_size = os::vm_page_size(); 2008 2009 // Make sure the pc and the faulting address are sane. 2010 // 2011 // If an instruction spans a page boundary, and the page containing 2012 // the beginning of the instruction is executable but the following 2013 // page is not, the pc and the faulting address might be slightly 2014 // different - we still want to unguard the 2nd page in this case. 2015 // 2016 // 15 bytes seems to be a (very) safe value for max instruction size. 2017 bool pc_is_near_addr = 2018 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2019 bool instr_spans_page_boundary = 2020 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2021 (intptr_t) page_size) > 0); 2022 2023 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2024 static volatile address last_addr = 2025 (address) os::non_memory_address_word(); 2026 2027 // In conservative mode, don't unguard unless the address is in the VM 2028 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2029 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2030 2031 // Set memory to RWX and retry 2032 address page_start = 2033 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2034 bool res = os::protect_memory((char*) page_start, page_size, 2035 os::MEM_PROT_RWX); 2036 2037 if (PrintMiscellaneous && Verbose) { 2038 char buf[256]; 2039 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 2040 "at " INTPTR_FORMAT 2041 ", unguarding " INTPTR_FORMAT ": %s", addr, 2042 page_start, (res ? "success" : strerror(errno))); 2043 tty->print_raw_cr(buf); 2044 } 2045 2046 // Set last_addr so if we fault again at the same address, we don't 2047 // end up in an endless loop. 2048 // 2049 // There are two potential complications here. Two threads trapping 2050 // at the same address at the same time could cause one of the 2051 // threads to think it already unguarded, and abort the VM. Likely 2052 // very rare. 2053 // 2054 // The other race involves two threads alternately trapping at 2055 // different addresses and failing to unguard the page, resulting in 2056 // an endless loop. This condition is probably even more unlikely 2057 // than the first. 2058 // 2059 // Although both cases could be avoided by using locks or thread 2060 // local last_addr, these solutions are unnecessary complication: 2061 // this handler is a best-effort safety net, not a complete solution. 2062 // It is disabled by default and should only be used as a workaround 2063 // in case we missed any no-execute-unsafe VM code. 2064 2065 last_addr = addr; 2066 2067 return EXCEPTION_CONTINUE_EXECUTION; 2068 } 2069 } 2070 2071 // Last unguard failed or not unguarding 2072 tty->print_raw_cr("Execution protection violation"); 2073 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2074 exceptionInfo->ContextRecord); 2075 return EXCEPTION_CONTINUE_SEARCH; 2076 } 2077 } 2078#endif // _WIN64 2079 2080 // Check to see if we caught the safepoint code in the 2081 // process of write protecting the memory serialization page. 2082 // It write enables the page immediately after protecting it 2083 // so just return. 2084 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { 2085 JavaThread* thread = (JavaThread*) t; 2086 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2087 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2088 if ( os::is_memory_serialize_page(thread, addr) ) { 2089 // Block current thread until the memory serialize page permission restored. 2090 os::block_on_serialize_page_trap(); 2091 return EXCEPTION_CONTINUE_EXECUTION; 2092 } 2093 } 2094 2095 2096 if (t != NULL && t->is_Java_thread()) { 2097 JavaThread* thread = (JavaThread*) t; 2098 bool in_java = thread->thread_state() == _thread_in_Java; 2099 2100 // Handle potential stack overflows up front. 2101 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2102 if (os::uses_stack_guard_pages()) { 2103#ifdef _M_IA64 2104 // 2105 // If it's a legal stack address continue, Windows will map it 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 return EXCEPTION_CONTINUE_EXECUTION; 2111 2112 // The register save area is the same size as the memory stack 2113 // and starts at the page just above the start of the memory stack. 2114 // If we get a fault in this area, we've run out of register 2115 // stack. If we are in java, try throwing a stack overflow exception. 2116 if (addr > thread->stack_base() && 2117 addr <= (thread->stack_base()+thread->stack_size()) ) { 2118 char buf[256]; 2119 jio_snprintf(buf, sizeof(buf), 2120 "Register stack overflow, addr:%p, stack_base:%p\n", 2121 addr, thread->stack_base() ); 2122 tty->print_raw_cr(buf); 2123 // If not in java code, return and hope for the best. 2124 return in_java ? Handle_Exception(exceptionInfo, 2125 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2126 : EXCEPTION_CONTINUE_EXECUTION; 2127 } 2128#endif 2129 if (thread->stack_yellow_zone_enabled()) { 2130 // Yellow zone violation. The o/s has unprotected the first yellow 2131 // zone page for us. Note: must call disable_stack_yellow_zone to 2132 // update the enabled status, even if the zone contains only one page. 2133 thread->disable_stack_yellow_zone(); 2134 // If not in java code, return and hope for the best. 2135 return in_java ? Handle_Exception(exceptionInfo, 2136 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2137 : EXCEPTION_CONTINUE_EXECUTION; 2138 } else { 2139 // Fatal red zone violation. 2140 thread->disable_stack_red_zone(); 2141 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2142 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2143 exceptionInfo->ContextRecord); 2144 return EXCEPTION_CONTINUE_SEARCH; 2145 } 2146 } else if (in_java) { 2147 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2148 // a one-time-only guard page, which it has released to us. The next 2149 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2150 return Handle_Exception(exceptionInfo, 2151 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2152 } else { 2153 // Can only return and hope for the best. Further stack growth will 2154 // result in an ACCESS_VIOLATION. 2155 return EXCEPTION_CONTINUE_EXECUTION; 2156 } 2157 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2158 // Either stack overflow or null pointer exception. 2159 if (in_java) { 2160 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2161 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2162 address stack_end = thread->stack_base() - thread->stack_size(); 2163 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2164 // Stack overflow. 2165 assert(!os::uses_stack_guard_pages(), 2166 "should be caught by red zone code above."); 2167 return Handle_Exception(exceptionInfo, 2168 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2169 } 2170 // 2171 // Check for safepoint polling and implicit null 2172 // We only expect null pointers in the stubs (vtable) 2173 // the rest are checked explicitly now. 2174 // 2175 CodeBlob* cb = CodeCache::find_blob(pc); 2176 if (cb != NULL) { 2177 if (os::is_poll_address(addr)) { 2178 address stub = SharedRuntime::get_poll_stub(pc); 2179 return Handle_Exception(exceptionInfo, stub); 2180 } 2181 } 2182 { 2183#ifdef _WIN64 2184 // 2185 // If it's a legal stack address map the entire region in 2186 // 2187 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2188 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2189 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) { 2190 addr = (address)((uintptr_t)addr & 2191 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2192 os::commit_memory( (char *)addr, thread->stack_base() - addr ); 2193 return EXCEPTION_CONTINUE_EXECUTION; 2194 } 2195 else 2196#endif 2197 { 2198 // Null pointer exception. 2199#ifdef _M_IA64 2200 // We catch register stack overflows in compiled code by doing 2201 // an explicit compare and executing a st8(G0, G0) if the 2202 // BSP enters into our guard area. We test for the overflow 2203 // condition and fall into the normal null pointer exception 2204 // code if BSP hasn't overflowed. 2205 if ( in_java ) { 2206 if(thread->register_stack_overflow()) { 2207 assert((address)exceptionInfo->ContextRecord->IntS3 == 2208 thread->register_stack_limit(), 2209 "GR7 doesn't contain register_stack_limit"); 2210 // Disable the yellow zone which sets the state that 2211 // we've got a stack overflow problem. 2212 if (thread->stack_yellow_zone_enabled()) { 2213 thread->disable_stack_yellow_zone(); 2214 } 2215 // Give us some room to process the exception 2216 thread->disable_register_stack_guard(); 2217 // Update GR7 with the new limit so we can continue running 2218 // compiled code. 2219 exceptionInfo->ContextRecord->IntS3 = 2220 (ULONGLONG)thread->register_stack_limit(); 2221 return Handle_Exception(exceptionInfo, 2222 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2223 } else { 2224 // 2225 // Check for implicit null 2226 // We only expect null pointers in the stubs (vtable) 2227 // the rest are checked explicitly now. 2228 // 2229 if (((uintptr_t)addr) < os::vm_page_size() ) { 2230 // an access to the first page of VM--assume it is a null pointer 2231 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2232 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2233 } 2234 } 2235 } // in_java 2236 2237 // IA64 doesn't use implicit null checking yet. So we shouldn't 2238 // get here. 2239 tty->print_raw_cr("Access violation, possible null pointer exception"); 2240 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2241 exceptionInfo->ContextRecord); 2242 return EXCEPTION_CONTINUE_SEARCH; 2243#else /* !IA64 */ 2244 2245 // Windows 98 reports faulting addresses incorrectly 2246 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2247 !os::win32::is_nt()) { 2248 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2249 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2250 } 2251 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2252 exceptionInfo->ContextRecord); 2253 return EXCEPTION_CONTINUE_SEARCH; 2254#endif 2255 } 2256 } 2257 } 2258 2259#ifdef _WIN64 2260 // Special care for fast JNI field accessors. 2261 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2262 // in and the heap gets shrunk before the field access. 2263 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2264 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2265 if (addr != (address)-1) { 2266 return Handle_Exception(exceptionInfo, addr); 2267 } 2268 } 2269#endif 2270 2271#ifdef _WIN64 2272 // Windows will sometimes generate an access violation 2273 // when we call malloc. Since we use VectoredExceptions 2274 // on 64 bit platforms, we see this exception. We must 2275 // pass this exception on so Windows can recover. 2276 // We check to see if the pc of the fault is in NTDLL.DLL 2277 // if so, we pass control on to Windows for handling. 2278 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH; 2279#endif 2280 2281 // Stack overflow or null pointer exception in native code. 2282 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2283 exceptionInfo->ContextRecord); 2284 return EXCEPTION_CONTINUE_SEARCH; 2285 } 2286 2287 if (in_java) { 2288 switch (exception_code) { 2289 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2290 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2291 2292 case EXCEPTION_INT_OVERFLOW: 2293 return Handle_IDiv_Exception(exceptionInfo); 2294 2295 } // switch 2296 } 2297#ifndef _WIN64 2298 if ((thread->thread_state() == _thread_in_Java) || 2299 (thread->thread_state() == _thread_in_native) ) 2300 { 2301 LONG result=Handle_FLT_Exception(exceptionInfo); 2302 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2303 } 2304#endif //_WIN64 2305 } 2306 2307 if (exception_code != EXCEPTION_BREAKPOINT) { 2308#ifndef _WIN64 2309 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2310 exceptionInfo->ContextRecord); 2311#else 2312 // Itanium Windows uses a VectoredExceptionHandler 2313 // Which means that C++ programatic exception handlers (try/except) 2314 // will get here. Continue the search for the right except block if 2315 // the exception code is not a fatal code. 2316 switch ( exception_code ) { 2317 case EXCEPTION_ACCESS_VIOLATION: 2318 case EXCEPTION_STACK_OVERFLOW: 2319 case EXCEPTION_ILLEGAL_INSTRUCTION: 2320 case EXCEPTION_ILLEGAL_INSTRUCTION_2: 2321 case EXCEPTION_INT_OVERFLOW: 2322 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2323 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2324 exceptionInfo->ContextRecord); 2325 } 2326 break; 2327 default: 2328 break; 2329 } 2330#endif 2331 } 2332 return EXCEPTION_CONTINUE_SEARCH; 2333} 2334 2335#ifndef _WIN64 2336// Special care for fast JNI accessors. 2337// jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2338// the heap gets shrunk before the field access. 2339// Need to install our own structured exception handler since native code may 2340// install its own. 2341LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2342 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2343 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2344 address pc = (address) exceptionInfo->ContextRecord->Eip; 2345 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2346 if (addr != (address)-1) { 2347 return Handle_Exception(exceptionInfo, addr); 2348 } 2349 } 2350 return EXCEPTION_CONTINUE_SEARCH; 2351} 2352 2353#define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \ 2354Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \ 2355 __try { \ 2356 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \ 2357 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \ 2358 } \ 2359 return 0; \ 2360} 2361 2362DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2363DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2364DEFINE_FAST_GETFIELD(jchar, char, Char) 2365DEFINE_FAST_GETFIELD(jshort, short, Short) 2366DEFINE_FAST_GETFIELD(jint, int, Int) 2367DEFINE_FAST_GETFIELD(jlong, long, Long) 2368DEFINE_FAST_GETFIELD(jfloat, float, Float) 2369DEFINE_FAST_GETFIELD(jdouble, double, Double) 2370 2371address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2372 switch (type) { 2373 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2374 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2375 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2376 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2377 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2378 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2379 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2380 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2381 default: ShouldNotReachHere(); 2382 } 2383 return (address)-1; 2384} 2385#endif 2386 2387// Virtual Memory 2388 2389int os::vm_page_size() { return os::win32::vm_page_size(); } 2390int os::vm_allocation_granularity() { 2391 return os::win32::vm_allocation_granularity(); 2392} 2393 2394// Windows large page support is available on Windows 2003. In order to use 2395// large page memory, the administrator must first assign additional privilege 2396// to the user: 2397// + select Control Panel -> Administrative Tools -> Local Security Policy 2398// + select Local Policies -> User Rights Assignment 2399// + double click "Lock pages in memory", add users and/or groups 2400// + reboot 2401// Note the above steps are needed for administrator as well, as administrators 2402// by default do not have the privilege to lock pages in memory. 2403// 2404// Note about Windows 2003: although the API supports committing large page 2405// memory on a page-by-page basis and VirtualAlloc() returns success under this 2406// scenario, I found through experiment it only uses large page if the entire 2407// memory region is reserved and committed in a single VirtualAlloc() call. 2408// This makes Windows large page support more or less like Solaris ISM, in 2409// that the entire heap must be committed upfront. This probably will change 2410// in the future, if so the code below needs to be revisited. 2411 2412#ifndef MEM_LARGE_PAGES 2413#define MEM_LARGE_PAGES 0x20000000 2414#endif 2415 2416// GetLargePageMinimum is only available on Windows 2003. The other functions 2417// are available on NT but not on Windows 98/Me. We have to resolve them at 2418// runtime. 2419typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void); 2420typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type) 2421 (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 2422typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE); 2423typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID); 2424 2425static GetLargePageMinimum_func_type _GetLargePageMinimum; 2426static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges; 2427static OpenProcessToken_func_type _OpenProcessToken; 2428static LookupPrivilegeValue_func_type _LookupPrivilegeValue; 2429 2430static HINSTANCE _kernel32; 2431static HINSTANCE _advapi32; 2432static HANDLE _hProcess; 2433static HANDLE _hToken; 2434 2435static size_t _large_page_size = 0; 2436 2437static bool resolve_functions_for_large_page_init() { 2438 _kernel32 = LoadLibrary("kernel32.dll"); 2439 if (_kernel32 == NULL) return false; 2440 2441 _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type, 2442 GetProcAddress(_kernel32, "GetLargePageMinimum")); 2443 if (_GetLargePageMinimum == NULL) return false; 2444 2445 _advapi32 = LoadLibrary("advapi32.dll"); 2446 if (_advapi32 == NULL) return false; 2447 2448 _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type, 2449 GetProcAddress(_advapi32, "AdjustTokenPrivileges")); 2450 _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type, 2451 GetProcAddress(_advapi32, "OpenProcessToken")); 2452 _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type, 2453 GetProcAddress(_advapi32, "LookupPrivilegeValueA")); 2454 return _AdjustTokenPrivileges != NULL && 2455 _OpenProcessToken != NULL && 2456 _LookupPrivilegeValue != NULL; 2457} 2458 2459static bool request_lock_memory_privilege() { 2460 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2461 os::current_process_id()); 2462 2463 LUID luid; 2464 if (_hProcess != NULL && 2465 _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2466 _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2467 2468 TOKEN_PRIVILEGES tp; 2469 tp.PrivilegeCount = 1; 2470 tp.Privileges[0].Luid = luid; 2471 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2472 2473 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2474 // privilege. Check GetLastError() too. See MSDN document. 2475 if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2476 (GetLastError() == ERROR_SUCCESS)) { 2477 return true; 2478 } 2479 } 2480 2481 return false; 2482} 2483 2484static void cleanup_after_large_page_init() { 2485 _GetLargePageMinimum = NULL; 2486 _AdjustTokenPrivileges = NULL; 2487 _OpenProcessToken = NULL; 2488 _LookupPrivilegeValue = NULL; 2489 if (_kernel32) FreeLibrary(_kernel32); 2490 _kernel32 = NULL; 2491 if (_advapi32) FreeLibrary(_advapi32); 2492 _advapi32 = NULL; 2493 if (_hProcess) CloseHandle(_hProcess); 2494 _hProcess = NULL; 2495 if (_hToken) CloseHandle(_hToken); 2496 _hToken = NULL; 2497} 2498 2499bool os::large_page_init() { 2500 if (!UseLargePages) return false; 2501 2502 // print a warning if any large page related flag is specified on command line 2503 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2504 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2505 bool success = false; 2506 2507# define WARN(msg) if (warn_on_failure) { warning(msg); } 2508 if (resolve_functions_for_large_page_init()) { 2509 if (request_lock_memory_privilege()) { 2510 size_t s = _GetLargePageMinimum(); 2511 if (s) { 2512#if defined(IA32) || defined(AMD64) 2513 if (s > 4*M || LargePageSizeInBytes > 4*M) { 2514 WARN("JVM cannot use large pages bigger than 4mb."); 2515 } else { 2516#endif 2517 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 2518 _large_page_size = LargePageSizeInBytes; 2519 } else { 2520 _large_page_size = s; 2521 } 2522 success = true; 2523#if defined(IA32) || defined(AMD64) 2524 } 2525#endif 2526 } else { 2527 WARN("Large page is not supported by the processor."); 2528 } 2529 } else { 2530 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 2531 } 2532 } else { 2533 WARN("Large page is not supported by the operating system."); 2534 } 2535#undef WARN 2536 2537 const size_t default_page_size = (size_t) vm_page_size(); 2538 if (success && _large_page_size > default_page_size) { 2539 _page_sizes[0] = _large_page_size; 2540 _page_sizes[1] = default_page_size; 2541 _page_sizes[2] = 0; 2542 } 2543 2544 cleanup_after_large_page_init(); 2545 return success; 2546} 2547 2548// On win32, one cannot release just a part of reserved memory, it's an 2549// all or nothing deal. When we split a reservation, we must break the 2550// reservation into two reservations. 2551void os::split_reserved_memory(char *base, size_t size, size_t split, 2552 bool realloc) { 2553 if (size > 0) { 2554 release_memory(base, size); 2555 if (realloc) { 2556 reserve_memory(split, base); 2557 } 2558 if (size != split) { 2559 reserve_memory(size - split, base + split); 2560 } 2561 } 2562} 2563 2564char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 2565 assert((size_t)addr % os::vm_allocation_granularity() == 0, 2566 "reserve alignment"); 2567 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size"); 2568 char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, 2569 PAGE_EXECUTE_READWRITE); 2570 assert(res == NULL || addr == NULL || addr == res, 2571 "Unexpected address from reserve."); 2572 return res; 2573} 2574 2575// Reserve memory at an arbitrary address, only if that area is 2576// available (and not reserved for something else). 2577char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2578 // Windows os::reserve_memory() fails of the requested address range is 2579 // not avilable. 2580 return reserve_memory(bytes, requested_addr); 2581} 2582 2583size_t os::large_page_size() { 2584 return _large_page_size; 2585} 2586 2587bool os::can_commit_large_page_memory() { 2588 // Windows only uses large page memory when the entire region is reserved 2589 // and committed in a single VirtualAlloc() call. This may change in the 2590 // future, but with Windows 2003 it's not possible to commit on demand. 2591 return false; 2592} 2593 2594bool os::can_execute_large_page_memory() { 2595 return true; 2596} 2597 2598char* os::reserve_memory_special(size_t bytes, char* addr) { 2599 2600 if (UseLargePagesIndividualAllocation) { 2601 if (TracePageSizes && Verbose) { 2602 tty->print_cr("Reserving large pages individually."); 2603 } 2604 char * p_buf; 2605 // first reserve enough address space in advance since we want to be 2606 // able to break a single contiguous virtual address range into multiple 2607 // large page commits but WS2003 does not allow reserving large page space 2608 // so we just use 4K pages for reserve, this gives us a legal contiguous 2609 // address space. then we will deallocate that reservation, and re alloc 2610 // using large pages 2611 const size_t size_of_reserve = bytes + _large_page_size; 2612 if (bytes > size_of_reserve) { 2613 // Overflowed. 2614 warning("Individually allocated large pages failed, " 2615 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 2616 return NULL; 2617 } 2618 p_buf = (char *) VirtualAlloc(addr, 2619 size_of_reserve, // size of Reserve 2620 MEM_RESERVE, 2621 PAGE_EXECUTE_READWRITE); 2622 // If reservation failed, return NULL 2623 if (p_buf == NULL) return NULL; 2624 2625 release_memory(p_buf, bytes + _large_page_size); 2626 // round up to page boundary. If the size_of_reserve did not 2627 // overflow and the reservation did not fail, this align up 2628 // should not overflow. 2629 p_buf = (char *) align_size_up((size_t)p_buf, _large_page_size); 2630 2631 // now go through and allocate one page at a time until all bytes are 2632 // allocated 2633 size_t bytes_remaining = align_size_up(bytes, _large_page_size); 2634 // An overflow of align_size_up() would have been caught above 2635 // in the calculation of size_of_reserve. 2636 char * next_alloc_addr = p_buf; 2637 2638#ifdef ASSERT 2639 // Variable for the failure injection 2640 long ran_num = os::random(); 2641 size_t fail_after = ran_num % bytes; 2642#endif 2643 2644 while (bytes_remaining) { 2645 size_t bytes_to_rq = MIN2(bytes_remaining, _large_page_size); 2646 // Note allocate and commit 2647 char * p_new; 2648 2649#ifdef ASSERT 2650 bool inject_error = LargePagesIndividualAllocationInjectError && 2651 (bytes_remaining <= fail_after); 2652#else 2653 const bool inject_error = false; 2654#endif 2655 2656 if (inject_error) { 2657 p_new = NULL; 2658 } else { 2659 p_new = (char *) VirtualAlloc(next_alloc_addr, 2660 bytes_to_rq, 2661 MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES, 2662 PAGE_EXECUTE_READWRITE); 2663 } 2664 2665 if (p_new == NULL) { 2666 // Free any allocated pages 2667 if (next_alloc_addr > p_buf) { 2668 // Some memory was committed so release it. 2669 size_t bytes_to_release = bytes - bytes_remaining; 2670 release_memory(p_buf, bytes_to_release); 2671 } 2672#ifdef ASSERT 2673 if (UseLargePagesIndividualAllocation && 2674 LargePagesIndividualAllocationInjectError) { 2675 if (TracePageSizes && Verbose) { 2676 tty->print_cr("Reserving large pages individually failed."); 2677 } 2678 } 2679#endif 2680 return NULL; 2681 } 2682 bytes_remaining -= bytes_to_rq; 2683 next_alloc_addr += bytes_to_rq; 2684 } 2685 2686 return p_buf; 2687 2688 } else { 2689 // normal policy just allocate it all at once 2690 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 2691 char * res = (char *)VirtualAlloc(NULL, 2692 bytes, 2693 flag, 2694 PAGE_EXECUTE_READWRITE); 2695 return res; 2696 } 2697} 2698 2699bool os::release_memory_special(char* base, size_t bytes) { 2700 return release_memory(base, bytes); 2701} 2702 2703void os::print_statistics() { 2704} 2705 2706bool os::commit_memory(char* addr, size_t bytes) { 2707 if (bytes == 0) { 2708 // Don't bother the OS with noops. 2709 return true; 2710 } 2711 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 2712 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 2713 // Don't attempt to print anything if the OS call fails. We're 2714 // probably low on resources, so the print itself may cause crashes. 2715 return VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_EXECUTE_READWRITE) != NULL; 2716} 2717 2718bool os::commit_memory(char* addr, size_t size, size_t alignment_hint) { 2719 return commit_memory(addr, size); 2720} 2721 2722bool os::uncommit_memory(char* addr, size_t bytes) { 2723 if (bytes == 0) { 2724 // Don't bother the OS with noops. 2725 return true; 2726 } 2727 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 2728 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 2729 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0; 2730} 2731 2732bool os::release_memory(char* addr, size_t bytes) { 2733 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 2734} 2735 2736// Set protections specified 2737bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2738 bool is_committed) { 2739 unsigned int p = 0; 2740 switch (prot) { 2741 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 2742 case MEM_PROT_READ: p = PAGE_READONLY; break; 2743 case MEM_PROT_RW: p = PAGE_READWRITE; break; 2744 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 2745 default: 2746 ShouldNotReachHere(); 2747 } 2748 2749 DWORD old_status; 2750 2751 // Strange enough, but on Win32 one can change protection only for committed 2752 // memory, not a big deal anyway, as bytes less or equal than 64K 2753 if (!is_committed && !commit_memory(addr, bytes)) { 2754 fatal("cannot commit protection page"); 2755 } 2756 // One cannot use os::guard_memory() here, as on Win32 guard page 2757 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 2758 // 2759 // Pages in the region become guard pages. Any attempt to access a guard page 2760 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 2761 // the guard page status. Guard pages thus act as a one-time access alarm. 2762 return VirtualProtect(addr, bytes, p, &old_status) != 0; 2763} 2764 2765bool os::guard_memory(char* addr, size_t bytes) { 2766 DWORD old_status; 2767 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 2768} 2769 2770bool os::unguard_memory(char* addr, size_t bytes) { 2771 DWORD old_status; 2772 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 2773} 2774 2775void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 2776void os::free_memory(char *addr, size_t bytes) { } 2777void os::numa_make_global(char *addr, size_t bytes) { } 2778void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 2779bool os::numa_topology_changed() { return false; } 2780size_t os::numa_get_groups_num() { return 1; } 2781int os::numa_get_group_id() { return 0; } 2782size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2783 if (size > 0) { 2784 ids[0] = 0; 2785 return 1; 2786 } 2787 return 0; 2788} 2789 2790bool os::get_page_info(char *start, page_info* info) { 2791 return false; 2792} 2793 2794char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2795 return end; 2796} 2797 2798char* os::non_memory_address_word() { 2799 // Must never look like an address returned by reserve_memory, 2800 // even in its subfields (as defined by the CPU immediate fields, 2801 // if the CPU splits constants across multiple instructions). 2802 return (char*)-1; 2803} 2804 2805#define MAX_ERROR_COUNT 100 2806#define SYS_THREAD_ERROR 0xffffffffUL 2807 2808void os::pd_start_thread(Thread* thread) { 2809 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 2810 // Returns previous suspend state: 2811 // 0: Thread was not suspended 2812 // 1: Thread is running now 2813 // >1: Thread is still suspended. 2814 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 2815} 2816 2817size_t os::read(int fd, void *buf, unsigned int nBytes) { 2818 return ::read(fd, buf, nBytes); 2819} 2820 2821class HighResolutionInterval { 2822 // The default timer resolution seems to be 10 milliseconds. 2823 // (Where is this written down?) 2824 // If someone wants to sleep for only a fraction of the default, 2825 // then we set the timer resolution down to 1 millisecond for 2826 // the duration of their interval. 2827 // We carefully set the resolution back, since otherwise we 2828 // seem to incur an overhead (3%?) that we don't need. 2829 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 2830 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 2831 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 2832 // timeBeginPeriod() if the relative error exceeded some threshold. 2833 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 2834 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 2835 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 2836 // resolution timers running. 2837private: 2838 jlong resolution; 2839public: 2840 HighResolutionInterval(jlong ms) { 2841 resolution = ms % 10L; 2842 if (resolution != 0) { 2843 MMRESULT result = timeBeginPeriod(1L); 2844 } 2845 } 2846 ~HighResolutionInterval() { 2847 if (resolution != 0) { 2848 MMRESULT result = timeEndPeriod(1L); 2849 } 2850 resolution = 0L; 2851 } 2852}; 2853 2854int os::sleep(Thread* thread, jlong ms, bool interruptable) { 2855 jlong limit = (jlong) MAXDWORD; 2856 2857 while(ms > limit) { 2858 int res; 2859 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) 2860 return res; 2861 ms -= limit; 2862 } 2863 2864 assert(thread == Thread::current(), "thread consistency check"); 2865 OSThread* osthread = thread->osthread(); 2866 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 2867 int result; 2868 if (interruptable) { 2869 assert(thread->is_Java_thread(), "must be java thread"); 2870 JavaThread *jt = (JavaThread *) thread; 2871 ThreadBlockInVM tbivm(jt); 2872 2873 jt->set_suspend_equivalent(); 2874 // cleared by handle_special_suspend_equivalent_condition() or 2875 // java_suspend_self() via check_and_wait_while_suspended() 2876 2877 HANDLE events[1]; 2878 events[0] = osthread->interrupt_event(); 2879 HighResolutionInterval *phri=NULL; 2880 if(!ForceTimeHighResolution) 2881 phri = new HighResolutionInterval( ms ); 2882 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 2883 result = OS_TIMEOUT; 2884 } else { 2885 ResetEvent(osthread->interrupt_event()); 2886 osthread->set_interrupted(false); 2887 result = OS_INTRPT; 2888 } 2889 delete phri; //if it is NULL, harmless 2890 2891 // were we externally suspended while we were waiting? 2892 jt->check_and_wait_while_suspended(); 2893 } else { 2894 assert(!thread->is_Java_thread(), "must not be java thread"); 2895 Sleep((long) ms); 2896 result = OS_TIMEOUT; 2897 } 2898 return result; 2899} 2900 2901// Sleep forever; naked call to OS-specific sleep; use with CAUTION 2902void os::infinite_sleep() { 2903 while (true) { // sleep forever ... 2904 Sleep(100000); // ... 100 seconds at a time 2905 } 2906} 2907 2908typedef BOOL (WINAPI * STTSignature)(void) ; 2909 2910os::YieldResult os::NakedYield() { 2911 // Use either SwitchToThread() or Sleep(0) 2912 // Consider passing back the return value from SwitchToThread(). 2913 // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread. 2914 // In that case we revert to Sleep(0). 2915 static volatile STTSignature stt = (STTSignature) 1 ; 2916 2917 if (stt == ((STTSignature) 1)) { 2918 stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ; 2919 // It's OK if threads race during initialization as the operation above is idempotent. 2920 } 2921 if (stt != NULL) { 2922 return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ; 2923 } else { 2924 Sleep (0) ; 2925 } 2926 return os::YIELD_UNKNOWN ; 2927} 2928 2929void os::yield() { os::NakedYield(); } 2930 2931void os::yield_all(int attempts) { 2932 // Yields to all threads, including threads with lower priorities 2933 Sleep(1); 2934} 2935 2936// Win32 only gives you access to seven real priorities at a time, 2937// so we compress Java's ten down to seven. It would be better 2938// if we dynamically adjusted relative priorities. 2939 2940int os::java_to_os_priority[MaxPriority + 1] = { 2941 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 2942 THREAD_PRIORITY_LOWEST, // 1 MinPriority 2943 THREAD_PRIORITY_LOWEST, // 2 2944 THREAD_PRIORITY_BELOW_NORMAL, // 3 2945 THREAD_PRIORITY_BELOW_NORMAL, // 4 2946 THREAD_PRIORITY_NORMAL, // 5 NormPriority 2947 THREAD_PRIORITY_NORMAL, // 6 2948 THREAD_PRIORITY_ABOVE_NORMAL, // 7 2949 THREAD_PRIORITY_ABOVE_NORMAL, // 8 2950 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 2951 THREAD_PRIORITY_HIGHEST // 10 MaxPriority 2952}; 2953 2954int prio_policy1[MaxPriority + 1] = { 2955 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 2956 THREAD_PRIORITY_LOWEST, // 1 MinPriority 2957 THREAD_PRIORITY_LOWEST, // 2 2958 THREAD_PRIORITY_BELOW_NORMAL, // 3 2959 THREAD_PRIORITY_BELOW_NORMAL, // 4 2960 THREAD_PRIORITY_NORMAL, // 5 NormPriority 2961 THREAD_PRIORITY_ABOVE_NORMAL, // 6 2962 THREAD_PRIORITY_ABOVE_NORMAL, // 7 2963 THREAD_PRIORITY_HIGHEST, // 8 2964 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 2965 THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority 2966}; 2967 2968static int prio_init() { 2969 // If ThreadPriorityPolicy is 1, switch tables 2970 if (ThreadPriorityPolicy == 1) { 2971 int i; 2972 for (i = 0; i < MaxPriority + 1; i++) { 2973 os::java_to_os_priority[i] = prio_policy1[i]; 2974 } 2975 } 2976 return 0; 2977} 2978 2979OSReturn os::set_native_priority(Thread* thread, int priority) { 2980 if (!UseThreadPriorities) return OS_OK; 2981 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 2982 return ret ? OS_OK : OS_ERR; 2983} 2984 2985OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) { 2986 if ( !UseThreadPriorities ) { 2987 *priority_ptr = java_to_os_priority[NormPriority]; 2988 return OS_OK; 2989 } 2990 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 2991 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 2992 assert(false, "GetThreadPriority failed"); 2993 return OS_ERR; 2994 } 2995 *priority_ptr = os_prio; 2996 return OS_OK; 2997} 2998 2999 3000// Hint to the underlying OS that a task switch would not be good. 3001// Void return because it's a hint and can fail. 3002void os::hint_no_preempt() {} 3003 3004void os::interrupt(Thread* thread) { 3005 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3006 "possibility of dangling Thread pointer"); 3007 3008 OSThread* osthread = thread->osthread(); 3009 osthread->set_interrupted(true); 3010 // More than one thread can get here with the same value of osthread, 3011 // resulting in multiple notifications. We do, however, want the store 3012 // to interrupted() to be visible to other threads before we post 3013 // the interrupt event. 3014 OrderAccess::release(); 3015 SetEvent(osthread->interrupt_event()); 3016 // For JSR166: unpark after setting status 3017 if (thread->is_Java_thread()) 3018 ((JavaThread*)thread)->parker()->unpark(); 3019 3020 ParkEvent * ev = thread->_ParkEvent ; 3021 if (ev != NULL) ev->unpark() ; 3022 3023} 3024 3025 3026bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3027 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3028 "possibility of dangling Thread pointer"); 3029 3030 OSThread* osthread = thread->osthread(); 3031 bool interrupted; 3032 interrupted = osthread->interrupted(); 3033 if (clear_interrupted == true) { 3034 osthread->set_interrupted(false); 3035 ResetEvent(osthread->interrupt_event()); 3036 } // Otherwise leave the interrupted state alone 3037 3038 return interrupted; 3039} 3040 3041// Get's a pc (hint) for a running thread. Currently used only for profiling. 3042ExtendedPC os::get_thread_pc(Thread* thread) { 3043 CONTEXT context; 3044 context.ContextFlags = CONTEXT_CONTROL; 3045 HANDLE handle = thread->osthread()->thread_handle(); 3046#ifdef _M_IA64 3047 assert(0, "Fix get_thread_pc"); 3048 return ExtendedPC(NULL); 3049#else 3050 if (GetThreadContext(handle, &context)) { 3051#ifdef _M_AMD64 3052 return ExtendedPC((address) context.Rip); 3053#else 3054 return ExtendedPC((address) context.Eip); 3055#endif 3056 } else { 3057 return ExtendedPC(NULL); 3058 } 3059#endif 3060} 3061 3062// GetCurrentThreadId() returns DWORD 3063intx os::current_thread_id() { return GetCurrentThreadId(); } 3064 3065static int _initial_pid = 0; 3066 3067int os::current_process_id() 3068{ 3069 return (_initial_pid ? _initial_pid : _getpid()); 3070} 3071 3072int os::win32::_vm_page_size = 0; 3073int os::win32::_vm_allocation_granularity = 0; 3074int os::win32::_processor_type = 0; 3075// Processor level is not available on non-NT systems, use vm_version instead 3076int os::win32::_processor_level = 0; 3077julong os::win32::_physical_memory = 0; 3078size_t os::win32::_default_stack_size = 0; 3079 3080 intx os::win32::_os_thread_limit = 0; 3081volatile intx os::win32::_os_thread_count = 0; 3082 3083bool os::win32::_is_nt = false; 3084bool os::win32::_is_windows_2003 = false; 3085 3086 3087void os::win32::initialize_system_info() { 3088 SYSTEM_INFO si; 3089 GetSystemInfo(&si); 3090 _vm_page_size = si.dwPageSize; 3091 _vm_allocation_granularity = si.dwAllocationGranularity; 3092 _processor_type = si.dwProcessorType; 3093 _processor_level = si.wProcessorLevel; 3094 _processor_count = si.dwNumberOfProcessors; 3095 3096 MEMORYSTATUS ms; 3097 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3098 // dwMemoryLoad (% of memory in use) 3099 GlobalMemoryStatus(&ms); 3100 _physical_memory = ms.dwTotalPhys; 3101 3102 OSVERSIONINFO oi; 3103 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); 3104 GetVersionEx(&oi); 3105 switch(oi.dwPlatformId) { 3106 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 3107 case VER_PLATFORM_WIN32_NT: 3108 _is_nt = true; 3109 { 3110 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3111 if (os_vers == 5002) { 3112 _is_windows_2003 = true; 3113 } 3114 } 3115 break; 3116 default: fatal("Unknown platform"); 3117 } 3118 3119 _default_stack_size = os::current_stack_size(); 3120 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3121 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3122 "stack size not a multiple of page size"); 3123 3124 initialize_performance_counter(); 3125 3126 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is 3127 // known to deadlock the system, if the VM issues to thread operations with 3128 // a too high frequency, e.g., such as changing the priorities. 3129 // The 6000 seems to work well - no deadlocks has been notices on the test 3130 // programs that we have seen experience this problem. 3131 if (!os::win32::is_nt()) { 3132 StarvationMonitorInterval = 6000; 3133 } 3134} 3135 3136 3137void os::win32::setmode_streams() { 3138 _setmode(_fileno(stdin), _O_BINARY); 3139 _setmode(_fileno(stdout), _O_BINARY); 3140 _setmode(_fileno(stderr), _O_BINARY); 3141} 3142 3143 3144int os::message_box(const char* title, const char* message) { 3145 int result = MessageBox(NULL, message, title, 3146 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 3147 return result == IDYES; 3148} 3149 3150int os::allocate_thread_local_storage() { 3151 return TlsAlloc(); 3152} 3153 3154 3155void os::free_thread_local_storage(int index) { 3156 TlsFree(index); 3157} 3158 3159 3160void os::thread_local_storage_at_put(int index, void* value) { 3161 TlsSetValue(index, value); 3162 assert(thread_local_storage_at(index) == value, "Just checking"); 3163} 3164 3165 3166void* os::thread_local_storage_at(int index) { 3167 return TlsGetValue(index); 3168} 3169 3170 3171#ifndef PRODUCT 3172#ifndef _WIN64 3173// Helpers to check whether NX protection is enabled 3174int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 3175 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 3176 pex->ExceptionRecord->NumberParameters > 0 && 3177 pex->ExceptionRecord->ExceptionInformation[0] == 3178 EXCEPTION_INFO_EXEC_VIOLATION) { 3179 return EXCEPTION_EXECUTE_HANDLER; 3180 } 3181 return EXCEPTION_CONTINUE_SEARCH; 3182} 3183 3184void nx_check_protection() { 3185 // If NX is enabled we'll get an exception calling into code on the stack 3186 char code[] = { (char)0xC3 }; // ret 3187 void *code_ptr = (void *)code; 3188 __try { 3189 __asm call code_ptr 3190 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 3191 tty->print_raw_cr("NX protection detected."); 3192 } 3193} 3194#endif // _WIN64 3195#endif // PRODUCT 3196 3197// this is called _before_ the global arguments have been parsed 3198void os::init(void) { 3199 _initial_pid = _getpid(); 3200 3201 init_random(1234567); 3202 3203 win32::initialize_system_info(); 3204 win32::setmode_streams(); 3205 init_page_sizes((size_t) win32::vm_page_size()); 3206 3207 // For better scalability on MP systems (must be called after initialize_system_info) 3208#ifndef PRODUCT 3209 if (is_MP()) { 3210 NoYieldsInMicrolock = true; 3211 } 3212#endif 3213 // This may be overridden later when argument processing is done. 3214 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, 3215 os::win32::is_windows_2003()); 3216 3217 // Initialize main_process and main_thread 3218 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 3219 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 3220 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 3221 fatal("DuplicateHandle failed\n"); 3222 } 3223 main_thread_id = (int) GetCurrentThreadId(); 3224} 3225 3226// To install functions for atexit processing 3227extern "C" { 3228 static void perfMemory_exit_helper() { 3229 perfMemory_exit(); 3230 } 3231} 3232 3233 3234// this is called _after_ the global arguments have been parsed 3235jint os::init_2(void) { 3236 // Allocate a single page and mark it as readable for safepoint polling 3237 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 3238 guarantee( polling_page != NULL, "Reserve Failed for polling page"); 3239 3240 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 3241 guarantee( return_page != NULL, "Commit Failed for polling page"); 3242 3243 os::set_polling_page( polling_page ); 3244 3245#ifndef PRODUCT 3246 if( Verbose && PrintMiscellaneous ) 3247 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 3248#endif 3249 3250 if (!UseMembar) { 3251 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_EXECUTE_READWRITE); 3252 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 3253 3254 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_EXECUTE_READWRITE); 3255 guarantee( return_page != NULL, "Commit Failed for memory serialize page"); 3256 3257 os::set_memory_serialize_page( mem_serialize_page ); 3258 3259#ifndef PRODUCT 3260 if(Verbose && PrintMiscellaneous) 3261 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3262#endif 3263} 3264 3265 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init()); 3266 3267 // Setup Windows Exceptions 3268 3269 // On Itanium systems, Structured Exception Handling does not 3270 // work since stack frames must be walkable by the OS. Since 3271 // much of our code is dynamically generated, and we do not have 3272 // proper unwind .xdata sections, the system simply exits 3273 // rather than delivering the exception. To work around 3274 // this we use VectorExceptions instead. 3275#ifdef _WIN64 3276 if (UseVectoredExceptions) { 3277 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter); 3278 } 3279#endif 3280 3281 // for debugging float code generation bugs 3282 if (ForceFloatExceptions) { 3283#ifndef _WIN64 3284 static long fp_control_word = 0; 3285 __asm { fstcw fp_control_word } 3286 // see Intel PPro Manual, Vol. 2, p 7-16 3287 const long precision = 0x20; 3288 const long underflow = 0x10; 3289 const long overflow = 0x08; 3290 const long zero_div = 0x04; 3291 const long denorm = 0x02; 3292 const long invalid = 0x01; 3293 fp_control_word |= invalid; 3294 __asm { fldcw fp_control_word } 3295#endif 3296 } 3297 3298 // Initialize HPI. 3299 jint hpi_result = hpi::initialize(); 3300 if (hpi_result != JNI_OK) { return hpi_result; } 3301 3302 // If stack_commit_size is 0, windows will reserve the default size, 3303 // but only commit a small portion of it. 3304 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 3305 size_t default_reserve_size = os::win32::default_stack_size(); 3306 size_t actual_reserve_size = stack_commit_size; 3307 if (stack_commit_size < default_reserve_size) { 3308 // If stack_commit_size == 0, we want this too 3309 actual_reserve_size = default_reserve_size; 3310 } 3311 3312 JavaThread::set_stack_size_at_create(stack_commit_size); 3313 3314 // Calculate theoretical max. size of Threads to guard gainst artifical 3315 // out-of-memory situations, where all available address-space has been 3316 // reserved by thread stacks. 3317 assert(actual_reserve_size != 0, "Must have a stack"); 3318 3319 // Calculate the thread limit when we should start doing Virtual Memory 3320 // banging. Currently when the threads will have used all but 200Mb of space. 3321 // 3322 // TODO: consider performing a similar calculation for commit size instead 3323 // as reserve size, since on a 64-bit platform we'll run into that more 3324 // often than running out of virtual memory space. We can use the 3325 // lower value of the two calculations as the os_thread_limit. 3326 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 3327 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 3328 3329 // at exit methods are called in the reverse order of their registration. 3330 // there is no limit to the number of functions registered. atexit does 3331 // not set errno. 3332 3333 if (PerfAllowAtExitRegistration) { 3334 // only register atexit functions if PerfAllowAtExitRegistration is set. 3335 // atexit functions can be delayed until process exit time, which 3336 // can be problematic for embedded VM situations. Embedded VMs should 3337 // call DestroyJavaVM() to assure that VM resources are released. 3338 3339 // note: perfMemory_exit_helper atexit function may be removed in 3340 // the future if the appropriate cleanup code can be added to the 3341 // VM_Exit VMOperation's doit method. 3342 if (atexit(perfMemory_exit_helper) != 0) { 3343 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3344 } 3345 } 3346 3347 // initialize PSAPI or ToolHelp for fatal error handler 3348 if (win32::is_nt()) _init_psapi(); 3349 else _init_toolhelp(); 3350 3351#ifndef _WIN64 3352 // Print something if NX is enabled (win32 on AMD64) 3353 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 3354#endif 3355 3356 // initialize thread priority policy 3357 prio_init(); 3358 3359 if (UseNUMA && !ForceNUMA) { 3360 UseNUMA = false; // Currently unsupported. 3361 } 3362 3363 return JNI_OK; 3364} 3365 3366 3367// Mark the polling page as unreadable 3368void os::make_polling_page_unreadable(void) { 3369 DWORD old_status; 3370 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) ) 3371 fatal("Could not disable polling page"); 3372}; 3373 3374// Mark the polling page as readable 3375void os::make_polling_page_readable(void) { 3376 DWORD old_status; 3377 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) ) 3378 fatal("Could not enable polling page"); 3379}; 3380 3381 3382int os::stat(const char *path, struct stat *sbuf) { 3383 char pathbuf[MAX_PATH]; 3384 if (strlen(path) > MAX_PATH - 1) { 3385 errno = ENAMETOOLONG; 3386 return -1; 3387 } 3388 hpi::native_path(strcpy(pathbuf, path)); 3389 int ret = ::stat(pathbuf, sbuf); 3390 if (sbuf != NULL && UseUTCFileTimestamp) { 3391 // Fix for 6539723. st_mtime returned from stat() is dependent on 3392 // the system timezone and so can return different values for the 3393 // same file if/when daylight savings time changes. This adjustment 3394 // makes sure the same timestamp is returned regardless of the TZ. 3395 // 3396 // See: 3397 // http://msdn.microsoft.com/library/ 3398 // default.asp?url=/library/en-us/sysinfo/base/ 3399 // time_zone_information_str.asp 3400 // and 3401 // http://msdn.microsoft.com/library/default.asp?url= 3402 // /library/en-us/sysinfo/base/settimezoneinformation.asp 3403 // 3404 // NOTE: there is a insidious bug here: If the timezone is changed 3405 // after the call to stat() but before 'GetTimeZoneInformation()', then 3406 // the adjustment we do here will be wrong and we'll return the wrong 3407 // value (which will likely end up creating an invalid class data 3408 // archive). Absent a better API for this, or some time zone locking 3409 // mechanism, we'll have to live with this risk. 3410 TIME_ZONE_INFORMATION tz; 3411 DWORD tzid = GetTimeZoneInformation(&tz); 3412 int daylightBias = 3413 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 3414 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 3415 } 3416 return ret; 3417} 3418 3419 3420#define FT2INT64(ft) \ 3421 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 3422 3423 3424// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3425// are used by JVM M&M and JVMTI to get user+sys or user CPU time 3426// of a thread. 3427// 3428// current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3429// the fast estimate available on the platform. 3430 3431// current_thread_cpu_time() is not optimized for Windows yet 3432jlong os::current_thread_cpu_time() { 3433 // return user + sys since the cost is the same 3434 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 3435} 3436 3437jlong os::thread_cpu_time(Thread* thread) { 3438 // consistent with what current_thread_cpu_time() returns. 3439 return os::thread_cpu_time(thread, true /* user+sys */); 3440} 3441 3442jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3443 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3444} 3445 3446jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 3447 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 3448 // If this function changes, os::is_thread_cpu_time_supported() should too 3449 if (os::win32::is_nt()) { 3450 FILETIME CreationTime; 3451 FILETIME ExitTime; 3452 FILETIME KernelTime; 3453 FILETIME UserTime; 3454 3455 if ( GetThreadTimes(thread->osthread()->thread_handle(), 3456 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 3457 return -1; 3458 else 3459 if (user_sys_cpu_time) { 3460 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 3461 } else { 3462 return FT2INT64(UserTime) * 100; 3463 } 3464 } else { 3465 return (jlong) timeGetTime() * 1000000; 3466 } 3467} 3468 3469void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3470 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 3471 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 3472 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 3473 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3474} 3475 3476void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3477 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 3478 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 3479 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 3480 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3481} 3482 3483bool os::is_thread_cpu_time_supported() { 3484 // see os::thread_cpu_time 3485 if (os::win32::is_nt()) { 3486 FILETIME CreationTime; 3487 FILETIME ExitTime; 3488 FILETIME KernelTime; 3489 FILETIME UserTime; 3490 3491 if ( GetThreadTimes(GetCurrentThread(), 3492 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 3493 return false; 3494 else 3495 return true; 3496 } else { 3497 return false; 3498 } 3499} 3500 3501// Windows does't provide a loadavg primitive so this is stubbed out for now. 3502// It does have primitives (PDH API) to get CPU usage and run queue length. 3503// "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 3504// If we wanted to implement loadavg on Windows, we have a few options: 3505// 3506// a) Query CPU usage and run queue length and "fake" an answer by 3507// returning the CPU usage if it's under 100%, and the run queue 3508// length otherwise. It turns out that querying is pretty slow 3509// on Windows, on the order of 200 microseconds on a fast machine. 3510// Note that on the Windows the CPU usage value is the % usage 3511// since the last time the API was called (and the first call 3512// returns 100%), so we'd have to deal with that as well. 3513// 3514// b) Sample the "fake" answer using a sampling thread and store 3515// the answer in a global variable. The call to loadavg would 3516// just return the value of the global, avoiding the slow query. 3517// 3518// c) Sample a better answer using exponential decay to smooth the 3519// value. This is basically the algorithm used by UNIX kernels. 3520// 3521// Note that sampling thread starvation could affect both (b) and (c). 3522int os::loadavg(double loadavg[], int nelem) { 3523 return -1; 3524} 3525 3526 3527// DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 3528bool os::dont_yield() { 3529 return DontYieldALot; 3530} 3531 3532// Is a (classpath) directory empty? 3533bool os::dir_is_empty(const char* path) { 3534 WIN32_FIND_DATA fd; 3535 HANDLE f = FindFirstFile(path, &fd); 3536 if (f == INVALID_HANDLE_VALUE) { 3537 return true; 3538 } 3539 FindClose(f); 3540 return false; 3541} 3542 3543// create binary file, rewriting existing file if required 3544int os::create_binary_file(const char* path, bool rewrite_existing) { 3545 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 3546 if (!rewrite_existing) { 3547 oflags |= _O_EXCL; 3548 } 3549 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 3550} 3551 3552// return current position of file pointer 3553jlong os::current_file_offset(int fd) { 3554 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 3555} 3556 3557// move file pointer to the specified offset 3558jlong os::seek_to_file_offset(int fd, jlong offset) { 3559 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 3560} 3561 3562 3563// Map a block of memory. 3564char* os::map_memory(int fd, const char* file_name, size_t file_offset, 3565 char *addr, size_t bytes, bool read_only, 3566 bool allow_exec) { 3567 HANDLE hFile; 3568 char* base; 3569 3570 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 3571 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 3572 if (hFile == NULL) { 3573 if (PrintMiscellaneous && Verbose) { 3574 DWORD err = GetLastError(); 3575 tty->print_cr("CreateFile() failed: GetLastError->%ld."); 3576 } 3577 return NULL; 3578 } 3579 3580 if (allow_exec) { 3581 // CreateFileMapping/MapViewOfFileEx can't map executable memory 3582 // unless it comes from a PE image (which the shared archive is not.) 3583 // Even VirtualProtect refuses to give execute access to mapped memory 3584 // that was not previously executable. 3585 // 3586 // Instead, stick the executable region in anonymous memory. Yuck. 3587 // Penalty is that ~4 pages will not be shareable - in the future 3588 // we might consider DLLizing the shared archive with a proper PE 3589 // header so that mapping executable + sharing is possible. 3590 3591 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 3592 PAGE_READWRITE); 3593 if (base == NULL) { 3594 if (PrintMiscellaneous && Verbose) { 3595 DWORD err = GetLastError(); 3596 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 3597 } 3598 CloseHandle(hFile); 3599 return NULL; 3600 } 3601 3602 DWORD bytes_read; 3603 OVERLAPPED overlapped; 3604 overlapped.Offset = (DWORD)file_offset; 3605 overlapped.OffsetHigh = 0; 3606 overlapped.hEvent = NULL; 3607 // ReadFile guarantees that if the return value is true, the requested 3608 // number of bytes were read before returning. 3609 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 3610 if (!res) { 3611 if (PrintMiscellaneous && Verbose) { 3612 DWORD err = GetLastError(); 3613 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 3614 } 3615 release_memory(base, bytes); 3616 CloseHandle(hFile); 3617 return NULL; 3618 } 3619 } else { 3620 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 3621 NULL /*file_name*/); 3622 if (hMap == NULL) { 3623 if (PrintMiscellaneous && Verbose) { 3624 DWORD err = GetLastError(); 3625 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld."); 3626 } 3627 CloseHandle(hFile); 3628 return NULL; 3629 } 3630 3631 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 3632 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 3633 (DWORD)bytes, addr); 3634 if (base == NULL) { 3635 if (PrintMiscellaneous && Verbose) { 3636 DWORD err = GetLastError(); 3637 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 3638 } 3639 CloseHandle(hMap); 3640 CloseHandle(hFile); 3641 return NULL; 3642 } 3643 3644 if (CloseHandle(hMap) == 0) { 3645 if (PrintMiscellaneous && Verbose) { 3646 DWORD err = GetLastError(); 3647 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 3648 } 3649 CloseHandle(hFile); 3650 return base; 3651 } 3652 } 3653 3654 if (allow_exec) { 3655 DWORD old_protect; 3656 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 3657 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 3658 3659 if (!res) { 3660 if (PrintMiscellaneous && Verbose) { 3661 DWORD err = GetLastError(); 3662 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 3663 } 3664 // Don't consider this a hard error, on IA32 even if the 3665 // VirtualProtect fails, we should still be able to execute 3666 CloseHandle(hFile); 3667 return base; 3668 } 3669 } 3670 3671 if (CloseHandle(hFile) == 0) { 3672 if (PrintMiscellaneous && Verbose) { 3673 DWORD err = GetLastError(); 3674 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 3675 } 3676 return base; 3677 } 3678 3679 return base; 3680} 3681 3682 3683// Remap a block of memory. 3684char* os::remap_memory(int fd, const char* file_name, size_t file_offset, 3685 char *addr, size_t bytes, bool read_only, 3686 bool allow_exec) { 3687 // This OS does not allow existing memory maps to be remapped so we 3688 // have to unmap the memory before we remap it. 3689 if (!os::unmap_memory(addr, bytes)) { 3690 return NULL; 3691 } 3692 3693 // There is a very small theoretical window between the unmap_memory() 3694 // call above and the map_memory() call below where a thread in native 3695 // code may be able to access an address that is no longer mapped. 3696 3697 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3698 allow_exec); 3699} 3700 3701 3702// Unmap a block of memory. 3703// Returns true=success, otherwise false. 3704 3705bool os::unmap_memory(char* addr, size_t bytes) { 3706 BOOL result = UnmapViewOfFile(addr); 3707 if (result == 0) { 3708 if (PrintMiscellaneous && Verbose) { 3709 DWORD err = GetLastError(); 3710 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 3711 } 3712 return false; 3713 } 3714 return true; 3715} 3716 3717void os::pause() { 3718 char filename[MAX_PATH]; 3719 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 3720 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 3721 } else { 3722 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 3723 } 3724 3725 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 3726 if (fd != -1) { 3727 struct stat buf; 3728 close(fd); 3729 while (::stat(filename, &buf) == 0) { 3730 Sleep(100); 3731 } 3732 } else { 3733 jio_fprintf(stderr, 3734 "Could not open pause file '%s', continuing immediately.\n", filename); 3735 } 3736} 3737 3738// An Event wraps a win32 "CreateEvent" kernel handle. 3739// 3740// We have a number of choices regarding "CreateEvent" win32 handle leakage: 3741// 3742// 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 3743// field, and call CloseHandle() on the win32 event handle. Unpark() would 3744// need to be modified to tolerate finding a NULL (invalid) win32 event handle. 3745// In addition, an unpark() operation might fetch the handle field, but the 3746// event could recycle between the fetch and the SetEvent() operation. 3747// SetEvent() would either fail because the handle was invalid, or inadvertently work, 3748// as the win32 handle value had been recycled. In an ideal world calling SetEvent() 3749// on an stale but recycled handle would be harmless, but in practice this might 3750// confuse other non-Sun code, so it's not a viable approach. 3751// 3752// 2: Once a win32 event handle is associated with an Event, it remains associated 3753// with the Event. The event handle is never closed. This could be construed 3754// as handle leakage, but only up to the maximum # of threads that have been extant 3755// at any one time. This shouldn't be an issue, as windows platforms typically 3756// permit a process to have hundreds of thousands of open handles. 3757// 3758// 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 3759// and release unused handles. 3760// 3761// 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 3762// It's not clear, however, that we wouldn't be trading one type of leak for another. 3763// 3764// 5. Use an RCU-like mechanism (Read-Copy Update). 3765// Or perhaps something similar to Maged Michael's "Hazard pointers". 3766// 3767// We use (2). 3768// 3769// TODO-FIXME: 3770// 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 3771// 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 3772// to recover from (or at least detect) the dreaded Windows 841176 bug. 3773// 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 3774// into a single win32 CreateEvent() handle. 3775// 3776// _Event transitions in park() 3777// -1 => -1 : illegal 3778// 1 => 0 : pass - return immediately 3779// 0 => -1 : block 3780// 3781// _Event serves as a restricted-range semaphore : 3782// -1 : thread is blocked 3783// 0 : neutral - thread is running or ready 3784// 1 : signaled - thread is running or ready 3785// 3786// Another possible encoding of _Event would be 3787// with explicit "PARKED" and "SIGNALED" bits. 3788 3789int os::PlatformEvent::park (jlong Millis) { 3790 guarantee (_ParkHandle != NULL , "Invariant") ; 3791 guarantee (Millis > 0 , "Invariant") ; 3792 int v ; 3793 3794 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 3795 // the initial park() operation. 3796 3797 for (;;) { 3798 v = _Event ; 3799 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 3800 } 3801 guarantee ((v == 0) || (v == 1), "invariant") ; 3802 if (v != 0) return OS_OK ; 3803 3804 // Do this the hard way by blocking ... 3805 // TODO: consider a brief spin here, gated on the success of recent 3806 // spin attempts by this thread. 3807 // 3808 // We decompose long timeouts into series of shorter timed waits. 3809 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 3810 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 3811 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 3812 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 3813 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 3814 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 3815 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 3816 // for the already waited time. This policy does not admit any new outcomes. 3817 // In the future, however, we might want to track the accumulated wait time and 3818 // adjust Millis accordingly if we encounter a spurious wakeup. 3819 3820 const int MAXTIMEOUT = 0x10000000 ; 3821 DWORD rv = WAIT_TIMEOUT ; 3822 while (_Event < 0 && Millis > 0) { 3823 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT) 3824 if (Millis > MAXTIMEOUT) { 3825 prd = MAXTIMEOUT ; 3826 } 3827 rv = ::WaitForSingleObject (_ParkHandle, prd) ; 3828 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ; 3829 if (rv == WAIT_TIMEOUT) { 3830 Millis -= prd ; 3831 } 3832 } 3833 v = _Event ; 3834 _Event = 0 ; 3835 OrderAccess::fence() ; 3836 // If we encounter a nearly simultanous timeout expiry and unpark() 3837 // we return OS_OK indicating we awoke via unpark(). 3838 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 3839 return (v >= 0) ? OS_OK : OS_TIMEOUT ; 3840} 3841 3842void os::PlatformEvent::park () { 3843 guarantee (_ParkHandle != NULL, "Invariant") ; 3844 // Invariant: Only the thread associated with the Event/PlatformEvent 3845 // may call park(). 3846 int v ; 3847 for (;;) { 3848 v = _Event ; 3849 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 3850 } 3851 guarantee ((v == 0) || (v == 1), "invariant") ; 3852 if (v != 0) return ; 3853 3854 // Do this the hard way by blocking ... 3855 // TODO: consider a brief spin here, gated on the success of recent 3856 // spin attempts by this thread. 3857 while (_Event < 0) { 3858 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ; 3859 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ; 3860 } 3861 3862 // Usually we'll find _Event == 0 at this point, but as 3863 // an optional optimization we clear it, just in case can 3864 // multiple unpark() operations drove _Event up to 1. 3865 _Event = 0 ; 3866 OrderAccess::fence() ; 3867 guarantee (_Event >= 0, "invariant") ; 3868} 3869 3870void os::PlatformEvent::unpark() { 3871 guarantee (_ParkHandle != NULL, "Invariant") ; 3872 int v ; 3873 for (;;) { 3874 v = _Event ; // Increment _Event if it's < 1. 3875 if (v > 0) { 3876 // If it's already signaled just return. 3877 // The LD of _Event could have reordered or be satisfied 3878 // by a read-aside from this processor's write buffer. 3879 // To avoid problems execute a barrier and then 3880 // ratify the value. A degenerate CAS() would also work. 3881 // Viz., CAS (v+0, &_Event, v) == v). 3882 OrderAccess::fence() ; 3883 if (_Event == v) return ; 3884 continue ; 3885 } 3886 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; 3887 } 3888 if (v < 0) { 3889 ::SetEvent (_ParkHandle) ; 3890 } 3891} 3892 3893 3894// JSR166 3895// ------------------------------------------------------- 3896 3897/* 3898 * The Windows implementation of Park is very straightforward: Basic 3899 * operations on Win32 Events turn out to have the right semantics to 3900 * use them directly. We opportunistically resuse the event inherited 3901 * from Monitor. 3902 */ 3903 3904 3905void Parker::park(bool isAbsolute, jlong time) { 3906 guarantee (_ParkEvent != NULL, "invariant") ; 3907 // First, demultiplex/decode time arguments 3908 if (time < 0) { // don't wait 3909 return; 3910 } 3911 else if (time == 0) { 3912 time = INFINITE; 3913 } 3914 else if (isAbsolute) { 3915 time -= os::javaTimeMillis(); // convert to relative time 3916 if (time <= 0) // already elapsed 3917 return; 3918 } 3919 else { // relative 3920 time /= 1000000; // Must coarsen from nanos to millis 3921 if (time == 0) // Wait for the minimal time unit if zero 3922 time = 1; 3923 } 3924 3925 JavaThread* thread = (JavaThread*)(Thread::current()); 3926 assert(thread->is_Java_thread(), "Must be JavaThread"); 3927 JavaThread *jt = (JavaThread *)thread; 3928 3929 // Don't wait if interrupted or already triggered 3930 if (Thread::is_interrupted(thread, false) || 3931 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 3932 ResetEvent(_ParkEvent); 3933 return; 3934 } 3935 else { 3936 ThreadBlockInVM tbivm(jt); 3937 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 3938 jt->set_suspend_equivalent(); 3939 3940 WaitForSingleObject(_ParkEvent, time); 3941 ResetEvent(_ParkEvent); 3942 3943 // If externally suspended while waiting, re-suspend 3944 if (jt->handle_special_suspend_equivalent_condition()) { 3945 jt->java_suspend_self(); 3946 } 3947 } 3948} 3949 3950void Parker::unpark() { 3951 guarantee (_ParkEvent != NULL, "invariant") ; 3952 SetEvent(_ParkEvent); 3953} 3954 3955// Run the specified command in a separate process. Return its exit value, 3956// or -1 on failure (e.g. can't create a new process). 3957int os::fork_and_exec(char* cmd) { 3958 STARTUPINFO si; 3959 PROCESS_INFORMATION pi; 3960 3961 memset(&si, 0, sizeof(si)); 3962 si.cb = sizeof(si); 3963 memset(&pi, 0, sizeof(pi)); 3964 BOOL rslt = CreateProcess(NULL, // executable name - use command line 3965 cmd, // command line 3966 NULL, // process security attribute 3967 NULL, // thread security attribute 3968 TRUE, // inherits system handles 3969 0, // no creation flags 3970 NULL, // use parent's environment block 3971 NULL, // use parent's starting directory 3972 &si, // (in) startup information 3973 &pi); // (out) process information 3974 3975 if (rslt) { 3976 // Wait until child process exits. 3977 WaitForSingleObject(pi.hProcess, INFINITE); 3978 3979 DWORD exit_code; 3980 GetExitCodeProcess(pi.hProcess, &exit_code); 3981 3982 // Close process and thread handles. 3983 CloseHandle(pi.hProcess); 3984 CloseHandle(pi.hThread); 3985 3986 return (int)exit_code; 3987 } else { 3988 return -1; 3989 } 3990} 3991 3992//-------------------------------------------------------------------------------------------------- 3993// Non-product code 3994 3995static int mallocDebugIntervalCounter = 0; 3996static int mallocDebugCounter = 0; 3997bool os::check_heap(bool force) { 3998 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 3999 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 4000 // Note: HeapValidate executes two hardware breakpoints when it finds something 4001 // wrong; at these points, eax contains the address of the offending block (I think). 4002 // To get to the exlicit error message(s) below, just continue twice. 4003 HANDLE heap = GetProcessHeap(); 4004 { HeapLock(heap); 4005 PROCESS_HEAP_ENTRY phe; 4006 phe.lpData = NULL; 4007 while (HeapWalk(heap, &phe) != 0) { 4008 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 4009 !HeapValidate(heap, 0, phe.lpData)) { 4010 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 4011 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 4012 fatal("corrupted C heap"); 4013 } 4014 } 4015 int err = GetLastError(); 4016 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 4017 fatal1("heap walk aborted with error %d", err); 4018 } 4019 HeapUnlock(heap); 4020 } 4021 mallocDebugIntervalCounter = 0; 4022 } 4023 return true; 4024} 4025 4026 4027#ifndef PRODUCT 4028bool os::find(address addr) { 4029 // Nothing yet 4030 return false; 4031} 4032#endif 4033 4034LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 4035 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 4036 4037 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { 4038 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow(); 4039 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 4040 address addr = (address) exceptionRecord->ExceptionInformation[1]; 4041 4042 if (os::is_memory_serialize_page(thread, addr)) 4043 return EXCEPTION_CONTINUE_EXECUTION; 4044 } 4045 4046 return EXCEPTION_CONTINUE_SEARCH; 4047} 4048 4049static int getLastErrorString(char *buf, size_t len) 4050{ 4051 long errval; 4052 4053 if ((errval = GetLastError()) != 0) 4054 { 4055 /* DOS error */ 4056 size_t n = (size_t)FormatMessage( 4057 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 4058 NULL, 4059 errval, 4060 0, 4061 buf, 4062 (DWORD)len, 4063 NULL); 4064 if (n > 3) { 4065 /* Drop final '.', CR, LF */ 4066 if (buf[n - 1] == '\n') n--; 4067 if (buf[n - 1] == '\r') n--; 4068 if (buf[n - 1] == '.') n--; 4069 buf[n] = '\0'; 4070 } 4071 return (int)n; 4072 } 4073 4074 if (errno != 0) 4075 { 4076 /* C runtime error that has no corresponding DOS error code */ 4077 const char *s = strerror(errno); 4078 size_t n = strlen(s); 4079 if (n >= len) n = len - 1; 4080 strncpy(buf, s, n); 4081 buf[n] = '\0'; 4082 return (int)n; 4083 } 4084 return 0; 4085} 4086