1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce 26 #define _WIN32_WINNT 0x0600 27 28 // no precompiled headers 29 #include "jvm.h" 30 #include "classfile/classLoader.hpp" 31 #include "classfile/systemDictionary.hpp" 32 #include "classfile/vmSymbols.hpp" 33 #include "code/icBuffer.hpp" 34 #include "code/vtableStubs.hpp" 35 #include "compiler/compileBroker.hpp" 36 #include "compiler/disassembler.hpp" 37 #include "interpreter/interpreter.hpp" 38 #include "logging/log.hpp" 39 #include "memory/allocation.inline.hpp" 40 #include "memory/filemap.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "os_share_windows.hpp" 43 #include "os_windows.inline.hpp" 44 #include "prims/jniFastGetField.hpp" 45 #include "prims/jvm_misc.hpp" 46 #include "runtime/arguments.hpp" 47 #include "runtime/atomic.hpp" 48 #include "runtime/extendedPC.hpp" 49 #include "runtime/globals.hpp" 50 #include "runtime/interfaceSupport.hpp" 51 #include "runtime/java.hpp" 52 #include "runtime/javaCalls.hpp" 53 #include "runtime/mutexLocker.hpp" 54 #include "runtime/objectMonitor.hpp" 55 #include "runtime/orderAccess.inline.hpp" 56 #include "runtime/osThread.hpp" 57 #include "runtime/perfMemory.hpp" 58 #include "runtime/sharedRuntime.hpp" 59 #include "runtime/statSampler.hpp" 60 #include "runtime/stubRoutines.hpp" 61 #include "runtime/thread.inline.hpp" 62 #include "runtime/threadCritical.hpp" 63 #include "runtime/timer.hpp" 64 #include "runtime/vm_version.hpp" 65 #include "semaphore_windows.hpp" 66 #include "services/attachListener.hpp" 67 #include "services/memTracker.hpp" 68 #include "services/runtimeService.hpp" 69 #include "utilities/align.hpp" 70 #include "utilities/decoder.hpp" 71 #include "utilities/defaultStream.hpp" 72 #include "utilities/events.hpp" 73 #include "utilities/growableArray.hpp" 74 #include "utilities/macros.hpp" 75 #include "utilities/vmError.hpp" 76 #include "symbolengine.hpp" 77 #include "windbghelp.hpp" 78 79 80 #ifdef _DEBUG 81 #include <crtdbg.h> 82 #endif 83 84 85 #include <windows.h> 86 #include <sys/types.h> 87 #include <sys/stat.h> 88 #include <sys/timeb.h> 89 #include <objidl.h> 90 #include <shlobj.h> 91 92 #include <malloc.h> 93 #include <signal.h> 94 #include <direct.h> 95 #include <errno.h> 96 #include <fcntl.h> 97 #include <io.h> 98 #include <process.h> // For _beginthreadex(), _endthreadex() 99 #include <imagehlp.h> // For os::dll_address_to_function_name 100 // for enumerating dll libraries 101 #include <vdmdbg.h> 102 #include <psapi.h> 103 104 // for timer info max values which include all bits 105 #define ALL_64_BITS CONST64(-1) 106 107 // For DLL loading/load error detection 108 // Values of PE COFF 109 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c 110 #define IMAGE_FILE_SIGNATURE_LENGTH 4 111 112 static HANDLE main_process; 113 static HANDLE main_thread; 114 static int main_thread_id; 115 116 static FILETIME process_creation_time; 117 static FILETIME process_exit_time; 118 static FILETIME process_user_time; 119 static FILETIME process_kernel_time; 120 121 #ifdef _M_AMD64 122 #define __CPU__ amd64 123 #else 124 #define __CPU__ i486 125 #endif 126 127 // save DLL module handle, used by GetModuleFileName 128 129 HINSTANCE vm_lib_handle; 130 131 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { 132 switch (reason) { 133 case DLL_PROCESS_ATTACH: 134 vm_lib_handle = hinst; 135 if (ForceTimeHighResolution) { 136 timeBeginPeriod(1L); 137 } 138 WindowsDbgHelp::pre_initialize(); 139 SymbolEngine::pre_initialize(); 140 break; 141 case DLL_PROCESS_DETACH: 142 if (ForceTimeHighResolution) { 143 timeEndPeriod(1L); 144 } 145 break; 146 default: 147 break; 148 } 149 return true; 150 } 151 152 static inline double fileTimeAsDouble(FILETIME* time) { 153 const double high = (double) ((unsigned int) ~0); 154 const double split = 10000000.0; 155 double result = (time->dwLowDateTime / split) + 156 time->dwHighDateTime * (high/split); 157 return result; 158 } 159 160 // Implementation of os 161 162 bool os::unsetenv(const char* name) { 163 assert(name != NULL, "Null pointer"); 164 return (SetEnvironmentVariable(name, NULL) == TRUE); 165 } 166 167 // No setuid programs under Windows. 168 bool os::have_special_privileges() { 169 return false; 170 } 171 172 173 // This method is a periodic task to check for misbehaving JNI applications 174 // under CheckJNI, we can add any periodic checks here. 175 // For Windows at the moment does nothing 176 void os::run_periodic_checks() { 177 return; 178 } 179 180 // previous UnhandledExceptionFilter, if there is one 181 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL; 182 183 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 184 185 void os::init_system_properties_values() { 186 // sysclasspath, java_home, dll_dir 187 { 188 char *home_path; 189 char *dll_path; 190 char *pslash; 191 char *bin = "\\bin"; 192 char home_dir[MAX_PATH + 1]; 193 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR"); 194 195 if (alt_home_dir != NULL) { 196 strncpy(home_dir, alt_home_dir, MAX_PATH + 1); 197 home_dir[MAX_PATH] = '\0'; 198 } else { 199 os::jvm_path(home_dir, sizeof(home_dir)); 200 // Found the full path to jvm.dll. 201 // Now cut the path to <java_home>/jre if we can. 202 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll 203 pslash = strrchr(home_dir, '\\'); 204 if (pslash != NULL) { 205 *pslash = '\0'; // get rid of \{client|server} 206 pslash = strrchr(home_dir, '\\'); 207 if (pslash != NULL) { 208 *pslash = '\0'; // get rid of \bin 209 } 210 } 211 } 212 213 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal); 214 if (home_path == NULL) { 215 return; 216 } 217 strcpy(home_path, home_dir); 218 Arguments::set_java_home(home_path); 219 FREE_C_HEAP_ARRAY(char, home_path); 220 221 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, 222 mtInternal); 223 if (dll_path == NULL) { 224 return; 225 } 226 strcpy(dll_path, home_dir); 227 strcat(dll_path, bin); 228 Arguments::set_dll_dir(dll_path); 229 FREE_C_HEAP_ARRAY(char, dll_path); 230 231 if (!set_boot_path('\\', ';')) { 232 return; 233 } 234 } 235 236 // library_path 237 #define EXT_DIR "\\lib\\ext" 238 #define BIN_DIR "\\bin" 239 #define PACKAGE_DIR "\\Sun\\Java" 240 { 241 // Win32 library search order (See the documentation for LoadLibrary): 242 // 243 // 1. The directory from which application is loaded. 244 // 2. The system wide Java Extensions directory (Java only) 245 // 3. System directory (GetSystemDirectory) 246 // 4. Windows directory (GetWindowsDirectory) 247 // 5. The PATH environment variable 248 // 6. The current directory 249 250 char *library_path; 251 char tmp[MAX_PATH]; 252 char *path_str = ::getenv("PATH"); 253 254 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 255 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal); 256 257 library_path[0] = '\0'; 258 259 GetModuleFileName(NULL, tmp, sizeof(tmp)); 260 *(strrchr(tmp, '\\')) = '\0'; 261 strcat(library_path, tmp); 262 263 GetWindowsDirectory(tmp, sizeof(tmp)); 264 strcat(library_path, ";"); 265 strcat(library_path, tmp); 266 strcat(library_path, PACKAGE_DIR BIN_DIR); 267 268 GetSystemDirectory(tmp, sizeof(tmp)); 269 strcat(library_path, ";"); 270 strcat(library_path, tmp); 271 272 GetWindowsDirectory(tmp, sizeof(tmp)); 273 strcat(library_path, ";"); 274 strcat(library_path, tmp); 275 276 if (path_str) { 277 strcat(library_path, ";"); 278 strcat(library_path, path_str); 279 } 280 281 strcat(library_path, ";."); 282 283 Arguments::set_library_path(library_path); 284 FREE_C_HEAP_ARRAY(char, library_path); 285 } 286 287 // Default extensions directory 288 { 289 char path[MAX_PATH]; 290 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 291 GetWindowsDirectory(path, MAX_PATH); 292 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 293 path, PACKAGE_DIR, EXT_DIR); 294 Arguments::set_ext_dirs(buf); 295 } 296 #undef EXT_DIR 297 #undef BIN_DIR 298 #undef PACKAGE_DIR 299 300 #ifndef _WIN64 301 // set our UnhandledExceptionFilter and save any previous one 302 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception); 303 #endif 304 305 // Done 306 return; 307 } 308 309 void os::breakpoint() { 310 DebugBreak(); 311 } 312 313 // Invoked from the BREAKPOINT Macro 314 extern "C" void breakpoint() { 315 os::breakpoint(); 316 } 317 318 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP. 319 // So far, this method is only used by Native Memory Tracking, which is 320 // only supported on Windows XP or later. 321 // 322 int os::get_native_stack(address* stack, int frames, int toSkip) { 323 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL); 324 for (int index = captured; index < frames; index ++) { 325 stack[index] = NULL; 326 } 327 return captured; 328 } 329 330 331 // os::current_stack_base() 332 // 333 // Returns the base of the stack, which is the stack's 334 // starting address. This function must be called 335 // while running on the stack of the thread being queried. 336 337 address os::current_stack_base() { 338 MEMORY_BASIC_INFORMATION minfo; 339 address stack_bottom; 340 size_t stack_size; 341 342 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 343 stack_bottom = (address)minfo.AllocationBase; 344 stack_size = minfo.RegionSize; 345 346 // Add up the sizes of all the regions with the same 347 // AllocationBase. 348 while (1) { 349 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 350 if (stack_bottom == (address)minfo.AllocationBase) { 351 stack_size += minfo.RegionSize; 352 } else { 353 break; 354 } 355 } 356 return stack_bottom + stack_size; 357 } 358 359 size_t os::current_stack_size() { 360 size_t sz; 361 MEMORY_BASIC_INFORMATION minfo; 362 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 363 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 364 return sz; 365 } 366 367 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 368 const struct tm* time_struct_ptr = localtime(clock); 369 if (time_struct_ptr != NULL) { 370 *res = *time_struct_ptr; 371 return res; 372 } 373 return NULL; 374 } 375 376 struct tm* os::gmtime_pd(const time_t* clock, struct tm* res) { 377 const struct tm* time_struct_ptr = gmtime(clock); 378 if (time_struct_ptr != NULL) { 379 *res = *time_struct_ptr; 380 return res; 381 } 382 return NULL; 383 } 384 385 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 386 387 // Thread start routine for all newly created threads 388 static unsigned __stdcall thread_native_entry(Thread* thread) { 389 // Try to randomize the cache line index of hot stack frames. 390 // This helps when threads of the same stack traces evict each other's 391 // cache lines. The threads can be either from the same JVM instance, or 392 // from different JVM instances. The benefit is especially true for 393 // processors with hyperthreading technology. 394 static int counter = 0; 395 int pid = os::current_process_id(); 396 _alloca(((pid ^ counter++) & 7) * 128); 397 398 thread->initialize_thread_current(); 399 400 OSThread* osthr = thread->osthread(); 401 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 402 403 if (UseNUMA) { 404 int lgrp_id = os::numa_get_group_id(); 405 if (lgrp_id != -1) { 406 thread->set_lgrp_id(lgrp_id); 407 } 408 } 409 410 // Diagnostic code to investigate JDK-6573254 411 int res = 30115; // non-java thread 412 if (thread->is_Java_thread()) { 413 res = 20115; // java thread 414 } 415 416 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id()); 417 418 // Install a win32 structured exception handler around every thread created 419 // by VM, so VM can generate error dump when an exception occurred in non- 420 // Java thread (e.g. VM thread). 421 __try { 422 thread->run(); 423 } __except(topLevelExceptionFilter( 424 (_EXCEPTION_POINTERS*)_exception_info())) { 425 // Nothing to do. 426 } 427 428 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); 429 430 // One less thread is executing 431 // When the VMThread gets here, the main thread may have already exited 432 // which frees the CodeHeap containing the Atomic::add code 433 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 434 Atomic::dec(&os::win32::_os_thread_count); 435 } 436 437 // If a thread has not deleted itself ("delete this") as part of its 438 // termination sequence, we have to ensure thread-local-storage is 439 // cleared before we actually terminate. No threads should ever be 440 // deleted asynchronously with respect to their termination. 441 if (Thread::current_or_null_safe() != NULL) { 442 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 443 thread->clear_thread_current(); 444 } 445 446 // Thread must not return from exit_process_or_thread(), but if it does, 447 // let it proceed to exit normally 448 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res); 449 } 450 451 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, 452 int thread_id) { 453 // Allocate the OSThread object 454 OSThread* osthread = new OSThread(NULL, NULL); 455 if (osthread == NULL) return NULL; 456 457 // Initialize support for Java interrupts 458 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 459 if (interrupt_event == NULL) { 460 delete osthread; 461 return NULL; 462 } 463 osthread->set_interrupt_event(interrupt_event); 464 465 // Store info on the Win32 thread into the OSThread 466 osthread->set_thread_handle(thread_handle); 467 osthread->set_thread_id(thread_id); 468 469 if (UseNUMA) { 470 int lgrp_id = os::numa_get_group_id(); 471 if (lgrp_id != -1) { 472 thread->set_lgrp_id(lgrp_id); 473 } 474 } 475 476 // Initial thread state is INITIALIZED, not SUSPENDED 477 osthread->set_state(INITIALIZED); 478 479 return osthread; 480 } 481 482 483 bool os::create_attached_thread(JavaThread* thread) { 484 #ifdef ASSERT 485 thread->verify_not_published(); 486 #endif 487 HANDLE thread_h; 488 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 489 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 490 fatal("DuplicateHandle failed\n"); 491 } 492 OSThread* osthread = create_os_thread(thread, thread_h, 493 (int)current_thread_id()); 494 if (osthread == NULL) { 495 return false; 496 } 497 498 // Initial thread state is RUNNABLE 499 osthread->set_state(RUNNABLE); 500 501 thread->set_osthread(osthread); 502 503 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", 504 os::current_thread_id()); 505 506 return true; 507 } 508 509 bool os::create_main_thread(JavaThread* thread) { 510 #ifdef ASSERT 511 thread->verify_not_published(); 512 #endif 513 if (_starting_thread == NULL) { 514 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 515 if (_starting_thread == NULL) { 516 return false; 517 } 518 } 519 520 // The primordial thread is runnable from the start) 521 _starting_thread->set_state(RUNNABLE); 522 523 thread->set_osthread(_starting_thread); 524 return true; 525 } 526 527 // Helper function to trace _beginthreadex attributes, 528 // similar to os::Posix::describe_pthread_attr() 529 static char* describe_beginthreadex_attributes(char* buf, size_t buflen, 530 size_t stacksize, unsigned initflag) { 531 stringStream ss(buf, buflen); 532 if (stacksize == 0) { 533 ss.print("stacksize: default, "); 534 } else { 535 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); 536 } 537 ss.print("flags: "); 538 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " "); 539 #define ALL(X) \ 540 X(CREATE_SUSPENDED) \ 541 X(STACK_SIZE_PARAM_IS_A_RESERVATION) 542 ALL(PRINT_FLAG) 543 #undef ALL 544 #undef PRINT_FLAG 545 return buf; 546 } 547 548 // Allocate and initialize a new OSThread 549 bool os::create_thread(Thread* thread, ThreadType thr_type, 550 size_t stack_size) { 551 unsigned thread_id; 552 553 // Allocate the OSThread object 554 OSThread* osthread = new OSThread(NULL, NULL); 555 if (osthread == NULL) { 556 return false; 557 } 558 559 // Initialize support for Java interrupts 560 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 561 if (interrupt_event == NULL) { 562 delete osthread; 563 return NULL; 564 } 565 osthread->set_interrupt_event(interrupt_event); 566 osthread->set_interrupted(false); 567 568 thread->set_osthread(osthread); 569 570 if (stack_size == 0) { 571 switch (thr_type) { 572 case os::java_thread: 573 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 574 if (JavaThread::stack_size_at_create() > 0) { 575 stack_size = JavaThread::stack_size_at_create(); 576 } 577 break; 578 case os::compiler_thread: 579 if (CompilerThreadStackSize > 0) { 580 stack_size = (size_t)(CompilerThreadStackSize * K); 581 break; 582 } // else fall through: 583 // use VMThreadStackSize if CompilerThreadStackSize is not defined 584 case os::vm_thread: 585 case os::pgc_thread: 586 case os::cgc_thread: 587 case os::watcher_thread: 588 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 589 break; 590 } 591 } 592 593 // Create the Win32 thread 594 // 595 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 596 // does not specify stack size. Instead, it specifies the size of 597 // initially committed space. The stack size is determined by 598 // PE header in the executable. If the committed "stack_size" is larger 599 // than default value in the PE header, the stack is rounded up to the 600 // nearest multiple of 1MB. For example if the launcher has default 601 // stack size of 320k, specifying any size less than 320k does not 602 // affect the actual stack size at all, it only affects the initial 603 // commitment. On the other hand, specifying 'stack_size' larger than 604 // default value may cause significant increase in memory usage, because 605 // not only the stack space will be rounded up to MB, but also the 606 // entire space is committed upfront. 607 // 608 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 609 // for CreateThread() that can treat 'stack_size' as stack size. However we 610 // are not supposed to call CreateThread() directly according to MSDN 611 // document because JVM uses C runtime library. The good news is that the 612 // flag appears to work with _beginthredex() as well. 613 614 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION; 615 HANDLE thread_handle = 616 (HANDLE)_beginthreadex(NULL, 617 (unsigned)stack_size, 618 (unsigned (__stdcall *)(void*)) thread_native_entry, 619 thread, 620 initflag, 621 &thread_id); 622 623 char buf[64]; 624 if (thread_handle != NULL) { 625 log_info(os, thread)("Thread started (tid: %u, attributes: %s)", 626 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag)); 627 } else { 628 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.", 629 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag)); 630 } 631 632 if (thread_handle == NULL) { 633 // Need to clean up stuff we've allocated so far 634 CloseHandle(osthread->interrupt_event()); 635 thread->set_osthread(NULL); 636 delete osthread; 637 return NULL; 638 } 639 640 Atomic::inc(&os::win32::_os_thread_count); 641 642 // Store info on the Win32 thread into the OSThread 643 osthread->set_thread_handle(thread_handle); 644 osthread->set_thread_id(thread_id); 645 646 // Initial thread state is INITIALIZED, not SUSPENDED 647 osthread->set_state(INITIALIZED); 648 649 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 650 return true; 651 } 652 653 654 // Free Win32 resources related to the OSThread 655 void os::free_thread(OSThread* osthread) { 656 assert(osthread != NULL, "osthread not set"); 657 658 // We are told to free resources of the argument thread, 659 // but we can only really operate on the current thread. 660 assert(Thread::current()->osthread() == osthread, 661 "os::free_thread but not current thread"); 662 663 CloseHandle(osthread->thread_handle()); 664 CloseHandle(osthread->interrupt_event()); 665 delete osthread; 666 } 667 668 static jlong first_filetime; 669 static jlong initial_performance_count; 670 static jlong performance_frequency; 671 672 673 jlong as_long(LARGE_INTEGER x) { 674 jlong result = 0; // initialization to avoid warning 675 set_high(&result, x.HighPart); 676 set_low(&result, x.LowPart); 677 return result; 678 } 679 680 681 jlong os::elapsed_counter() { 682 LARGE_INTEGER count; 683 QueryPerformanceCounter(&count); 684 return as_long(count) - initial_performance_count; 685 } 686 687 688 jlong os::elapsed_frequency() { 689 return performance_frequency; 690 } 691 692 693 julong os::available_memory() { 694 return win32::available_memory(); 695 } 696 697 julong os::win32::available_memory() { 698 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 699 // value if total memory is larger than 4GB 700 MEMORYSTATUSEX ms; 701 ms.dwLength = sizeof(ms); 702 GlobalMemoryStatusEx(&ms); 703 704 return (julong)ms.ullAvailPhys; 705 } 706 707 julong os::physical_memory() { 708 return win32::physical_memory(); 709 } 710 711 bool os::has_allocatable_memory_limit(julong* limit) { 712 MEMORYSTATUSEX ms; 713 ms.dwLength = sizeof(ms); 714 GlobalMemoryStatusEx(&ms); 715 #ifdef _LP64 716 *limit = (julong)ms.ullAvailVirtual; 717 return true; 718 #else 719 // Limit to 1400m because of the 2gb address space wall 720 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual); 721 return true; 722 #endif 723 } 724 725 int os::active_processor_count() { 726 DWORD_PTR lpProcessAffinityMask = 0; 727 DWORD_PTR lpSystemAffinityMask = 0; 728 int proc_count = processor_count(); 729 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 730 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 731 // Nof active processors is number of bits in process affinity mask 732 int bitcount = 0; 733 while (lpProcessAffinityMask != 0) { 734 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 735 bitcount++; 736 } 737 return bitcount; 738 } else { 739 return proc_count; 740 } 741 } 742 743 void os::set_native_thread_name(const char *name) { 744 745 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx 746 // 747 // Note that unfortunately this only works if the process 748 // is already attached to a debugger; debugger must observe 749 // the exception below to show the correct name. 750 751 // If there is no debugger attached skip raising the exception 752 if (!IsDebuggerPresent()) { 753 return; 754 } 755 756 const DWORD MS_VC_EXCEPTION = 0x406D1388; 757 struct { 758 DWORD dwType; // must be 0x1000 759 LPCSTR szName; // pointer to name (in user addr space) 760 DWORD dwThreadID; // thread ID (-1=caller thread) 761 DWORD dwFlags; // reserved for future use, must be zero 762 } info; 763 764 info.dwType = 0x1000; 765 info.szName = name; 766 info.dwThreadID = -1; 767 info.dwFlags = 0; 768 769 __try { 770 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info ); 771 } __except(EXCEPTION_EXECUTE_HANDLER) {} 772 } 773 774 bool os::distribute_processes(uint length, uint* distribution) { 775 // Not yet implemented. 776 return false; 777 } 778 779 bool os::bind_to_processor(uint processor_id) { 780 // Not yet implemented. 781 return false; 782 } 783 784 void os::win32::initialize_performance_counter() { 785 LARGE_INTEGER count; 786 QueryPerformanceFrequency(&count); 787 performance_frequency = as_long(count); 788 QueryPerformanceCounter(&count); 789 initial_performance_count = as_long(count); 790 } 791 792 793 double os::elapsedTime() { 794 return (double) elapsed_counter() / (double) elapsed_frequency(); 795 } 796 797 798 // Windows format: 799 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 800 // Java format: 801 // Java standards require the number of milliseconds since 1/1/1970 802 803 // Constant offset - calculated using offset() 804 static jlong _offset = 116444736000000000; 805 // Fake time counter for reproducible results when debugging 806 static jlong fake_time = 0; 807 808 #ifdef ASSERT 809 // Just to be safe, recalculate the offset in debug mode 810 static jlong _calculated_offset = 0; 811 static int _has_calculated_offset = 0; 812 813 jlong offset() { 814 if (_has_calculated_offset) return _calculated_offset; 815 SYSTEMTIME java_origin; 816 java_origin.wYear = 1970; 817 java_origin.wMonth = 1; 818 java_origin.wDayOfWeek = 0; // ignored 819 java_origin.wDay = 1; 820 java_origin.wHour = 0; 821 java_origin.wMinute = 0; 822 java_origin.wSecond = 0; 823 java_origin.wMilliseconds = 0; 824 FILETIME jot; 825 if (!SystemTimeToFileTime(&java_origin, &jot)) { 826 fatal("Error = %d\nWindows error", GetLastError()); 827 } 828 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 829 _has_calculated_offset = 1; 830 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 831 return _calculated_offset; 832 } 833 #else 834 jlong offset() { 835 return _offset; 836 } 837 #endif 838 839 jlong windows_to_java_time(FILETIME wt) { 840 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 841 return (a - offset()) / 10000; 842 } 843 844 // Returns time ticks in (10th of micro seconds) 845 jlong windows_to_time_ticks(FILETIME wt) { 846 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 847 return (a - offset()); 848 } 849 850 FILETIME java_to_windows_time(jlong l) { 851 jlong a = (l * 10000) + offset(); 852 FILETIME result; 853 result.dwHighDateTime = high(a); 854 result.dwLowDateTime = low(a); 855 return result; 856 } 857 858 bool os::supports_vtime() { return true; } 859 bool os::enable_vtime() { return false; } 860 bool os::vtime_enabled() { return false; } 861 862 double os::elapsedVTime() { 863 FILETIME created; 864 FILETIME exited; 865 FILETIME kernel; 866 FILETIME user; 867 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) { 868 // the resolution of windows_to_java_time() should be sufficient (ms) 869 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS; 870 } else { 871 return elapsedTime(); 872 } 873 } 874 875 jlong os::javaTimeMillis() { 876 if (UseFakeTimers) { 877 return fake_time++; 878 } else { 879 FILETIME wt; 880 GetSystemTimeAsFileTime(&wt); 881 return windows_to_java_time(wt); 882 } 883 } 884 885 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 886 FILETIME wt; 887 GetSystemTimeAsFileTime(&wt); 888 jlong ticks = windows_to_time_ticks(wt); // 10th of micros 889 jlong secs = jlong(ticks / 10000000); // 10000 * 1000 890 seconds = secs; 891 nanos = jlong(ticks - (secs*10000000)) * 100; 892 } 893 894 jlong os::javaTimeNanos() { 895 LARGE_INTEGER current_count; 896 QueryPerformanceCounter(¤t_count); 897 double current = as_long(current_count); 898 double freq = performance_frequency; 899 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC); 900 return time; 901 } 902 903 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 904 jlong freq = performance_frequency; 905 if (freq < NANOSECS_PER_SEC) { 906 // the performance counter is 64 bits and we will 907 // be multiplying it -- so no wrap in 64 bits 908 info_ptr->max_value = ALL_64_BITS; 909 } else if (freq > NANOSECS_PER_SEC) { 910 // use the max value the counter can reach to 911 // determine the max value which could be returned 912 julong max_counter = (julong)ALL_64_BITS; 913 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC)); 914 } else { 915 // the performance counter is 64 bits and we will 916 // be using it directly -- so no wrap in 64 bits 917 info_ptr->max_value = ALL_64_BITS; 918 } 919 920 // using a counter, so no skipping 921 info_ptr->may_skip_backward = false; 922 info_ptr->may_skip_forward = false; 923 924 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 925 } 926 927 char* os::local_time_string(char *buf, size_t buflen) { 928 SYSTEMTIME st; 929 GetLocalTime(&st); 930 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 931 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 932 return buf; 933 } 934 935 bool os::getTimesSecs(double* process_real_time, 936 double* process_user_time, 937 double* process_system_time) { 938 HANDLE h_process = GetCurrentProcess(); 939 FILETIME create_time, exit_time, kernel_time, user_time; 940 BOOL result = GetProcessTimes(h_process, 941 &create_time, 942 &exit_time, 943 &kernel_time, 944 &user_time); 945 if (result != 0) { 946 FILETIME wt; 947 GetSystemTimeAsFileTime(&wt); 948 jlong rtc_millis = windows_to_java_time(wt); 949 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 950 *process_user_time = 951 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS); 952 *process_system_time = 953 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS); 954 return true; 955 } else { 956 return false; 957 } 958 } 959 960 void os::shutdown() { 961 // allow PerfMemory to attempt cleanup of any persistent resources 962 perfMemory_exit(); 963 964 // flush buffered output, finish log files 965 ostream_abort(); 966 967 // Check for abort hook 968 abort_hook_t abort_hook = Arguments::abort_hook(); 969 if (abort_hook != NULL) { 970 abort_hook(); 971 } 972 } 973 974 975 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 976 PMINIDUMP_EXCEPTION_INFORMATION, 977 PMINIDUMP_USER_STREAM_INFORMATION, 978 PMINIDUMP_CALLBACK_INFORMATION); 979 980 static HANDLE dumpFile = NULL; 981 982 // Check if dump file can be created. 983 void os::check_dump_limit(char* buffer, size_t buffsz) { 984 bool status = true; 985 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) { 986 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line"); 987 status = false; 988 } 989 990 #ifndef ASSERT 991 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) { 992 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows"); 993 status = false; 994 } 995 #endif 996 997 if (status) { 998 const char* cwd = get_current_directory(NULL, 0); 999 int pid = current_process_id(); 1000 if (cwd != NULL) { 1001 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid); 1002 } else { 1003 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid); 1004 } 1005 1006 if (dumpFile == NULL && 1007 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL)) 1008 == INVALID_HANDLE_VALUE) { 1009 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError()); 1010 status = false; 1011 } 1012 } 1013 VMError::record_coredump_status(buffer, status); 1014 } 1015 1016 void os::abort(bool dump_core, void* siginfo, const void* context) { 1017 EXCEPTION_POINTERS ep; 1018 MINIDUMP_EXCEPTION_INFORMATION mei; 1019 MINIDUMP_EXCEPTION_INFORMATION* pmei; 1020 1021 HANDLE hProcess = GetCurrentProcess(); 1022 DWORD processId = GetCurrentProcessId(); 1023 MINIDUMP_TYPE dumpType; 1024 1025 shutdown(); 1026 if (!dump_core || dumpFile == NULL) { 1027 if (dumpFile != NULL) { 1028 CloseHandle(dumpFile); 1029 } 1030 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1031 } 1032 1033 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData | 1034 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules); 1035 1036 if (siginfo != NULL && context != NULL) { 1037 ep.ContextRecord = (PCONTEXT) context; 1038 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo; 1039 1040 mei.ThreadId = GetCurrentThreadId(); 1041 mei.ExceptionPointers = &ep; 1042 pmei = &mei; 1043 } else { 1044 pmei = NULL; 1045 } 1046 1047 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all 1048 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then. 1049 if (!WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) && 1050 !WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL)) { 1051 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError()); 1052 } 1053 CloseHandle(dumpFile); 1054 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1055 } 1056 1057 // Die immediately, no exit hook, no abort hook, no cleanup. 1058 void os::die() { 1059 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1); 1060 } 1061 1062 // Directory routines copied from src/win32/native/java/io/dirent_md.c 1063 // * dirent_md.c 1.15 00/02/02 1064 // 1065 // The declarations for DIR and struct dirent are in jvm_win32.h. 1066 1067 // Caller must have already run dirname through JVM_NativePath, which removes 1068 // duplicate slashes and converts all instances of '/' into '\\'. 1069 1070 DIR * os::opendir(const char *dirname) { 1071 assert(dirname != NULL, "just checking"); // hotspot change 1072 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal); 1073 DWORD fattr; // hotspot change 1074 char alt_dirname[4] = { 0, 0, 0, 0 }; 1075 1076 if (dirp == 0) { 1077 errno = ENOMEM; 1078 return 0; 1079 } 1080 1081 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it 1082 // as a directory in FindFirstFile(). We detect this case here and 1083 // prepend the current drive name. 1084 // 1085 if (dirname[1] == '\0' && dirname[0] == '\\') { 1086 alt_dirname[0] = _getdrive() + 'A' - 1; 1087 alt_dirname[1] = ':'; 1088 alt_dirname[2] = '\\'; 1089 alt_dirname[3] = '\0'; 1090 dirname = alt_dirname; 1091 } 1092 1093 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal); 1094 if (dirp->path == 0) { 1095 free(dirp); 1096 errno = ENOMEM; 1097 return 0; 1098 } 1099 strcpy(dirp->path, dirname); 1100 1101 fattr = GetFileAttributes(dirp->path); 1102 if (fattr == 0xffffffff) { 1103 free(dirp->path); 1104 free(dirp); 1105 errno = ENOENT; 1106 return 0; 1107 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 1108 free(dirp->path); 1109 free(dirp); 1110 errno = ENOTDIR; 1111 return 0; 1112 } 1113 1114 // Append "*.*", or possibly "\\*.*", to path 1115 if (dirp->path[1] == ':' && 1116 (dirp->path[2] == '\0' || 1117 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 1118 // No '\\' needed for cases like "Z:" or "Z:\" 1119 strcat(dirp->path, "*.*"); 1120 } else { 1121 strcat(dirp->path, "\\*.*"); 1122 } 1123 1124 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 1125 if (dirp->handle == INVALID_HANDLE_VALUE) { 1126 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 1127 free(dirp->path); 1128 free(dirp); 1129 errno = EACCES; 1130 return 0; 1131 } 1132 } 1133 return dirp; 1134 } 1135 1136 // parameter dbuf unused on Windows 1137 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) { 1138 assert(dirp != NULL, "just checking"); // hotspot change 1139 if (dirp->handle == INVALID_HANDLE_VALUE) { 1140 return 0; 1141 } 1142 1143 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 1144 1145 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 1146 if (GetLastError() == ERROR_INVALID_HANDLE) { 1147 errno = EBADF; 1148 return 0; 1149 } 1150 FindClose(dirp->handle); 1151 dirp->handle = INVALID_HANDLE_VALUE; 1152 } 1153 1154 return &dirp->dirent; 1155 } 1156 1157 int os::closedir(DIR *dirp) { 1158 assert(dirp != NULL, "just checking"); // hotspot change 1159 if (dirp->handle != INVALID_HANDLE_VALUE) { 1160 if (!FindClose(dirp->handle)) { 1161 errno = EBADF; 1162 return -1; 1163 } 1164 dirp->handle = INVALID_HANDLE_VALUE; 1165 } 1166 free(dirp->path); 1167 free(dirp); 1168 return 0; 1169 } 1170 1171 // This must be hard coded because it's the system's temporary 1172 // directory not the java application's temp directory, ala java.io.tmpdir. 1173 const char* os::get_temp_directory() { 1174 static char path_buf[MAX_PATH]; 1175 if (GetTempPath(MAX_PATH, path_buf) > 0) { 1176 return path_buf; 1177 } else { 1178 path_buf[0] = '\0'; 1179 return path_buf; 1180 } 1181 } 1182 1183 // Needs to be in os specific directory because windows requires another 1184 // header file <direct.h> 1185 const char* os::get_current_directory(char *buf, size_t buflen) { 1186 int n = static_cast<int>(buflen); 1187 if (buflen > INT_MAX) n = INT_MAX; 1188 return _getcwd(buf, n); 1189 } 1190 1191 //----------------------------------------------------------- 1192 // Helper functions for fatal error handler 1193 #ifdef _WIN64 1194 // Helper routine which returns true if address in 1195 // within the NTDLL address space. 1196 // 1197 static bool _addr_in_ntdll(address addr) { 1198 HMODULE hmod; 1199 MODULEINFO minfo; 1200 1201 hmod = GetModuleHandle("NTDLL.DLL"); 1202 if (hmod == NULL) return false; 1203 if (!GetModuleInformation(GetCurrentProcess(), hmod, 1204 &minfo, sizeof(MODULEINFO))) { 1205 return false; 1206 } 1207 1208 if ((addr >= minfo.lpBaseOfDll) && 1209 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) { 1210 return true; 1211 } else { 1212 return false; 1213 } 1214 } 1215 #endif 1216 1217 struct _modinfo { 1218 address addr; 1219 char* full_path; // point to a char buffer 1220 int buflen; // size of the buffer 1221 address base_addr; 1222 }; 1223 1224 static int _locate_module_by_addr(const char * mod_fname, address base_addr, 1225 address top_address, void * param) { 1226 struct _modinfo *pmod = (struct _modinfo *)param; 1227 if (!pmod) return -1; 1228 1229 if (base_addr <= pmod->addr && 1230 top_address > pmod->addr) { 1231 // if a buffer is provided, copy path name to the buffer 1232 if (pmod->full_path) { 1233 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1234 } 1235 pmod->base_addr = base_addr; 1236 return 1; 1237 } 1238 return 0; 1239 } 1240 1241 bool os::dll_address_to_library_name(address addr, char* buf, 1242 int buflen, int* offset) { 1243 // buf is not optional, but offset is optional 1244 assert(buf != NULL, "sanity check"); 1245 1246 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1247 // return the full path to the DLL file, sometimes it returns path 1248 // to the corresponding PDB file (debug info); sometimes it only 1249 // returns partial path, which makes life painful. 1250 1251 struct _modinfo mi; 1252 mi.addr = addr; 1253 mi.full_path = buf; 1254 mi.buflen = buflen; 1255 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) { 1256 // buf already contains path name 1257 if (offset) *offset = addr - mi.base_addr; 1258 return true; 1259 } 1260 1261 buf[0] = '\0'; 1262 if (offset) *offset = -1; 1263 return false; 1264 } 1265 1266 bool os::dll_address_to_function_name(address addr, char *buf, 1267 int buflen, int *offset, 1268 bool demangle) { 1269 // buf is not optional, but offset is optional 1270 assert(buf != NULL, "sanity check"); 1271 1272 if (Decoder::decode(addr, buf, buflen, offset, demangle)) { 1273 return true; 1274 } 1275 if (offset != NULL) *offset = -1; 1276 buf[0] = '\0'; 1277 return false; 1278 } 1279 1280 // save the start and end address of jvm.dll into param[0] and param[1] 1281 static int _locate_jvm_dll(const char* mod_fname, address base_addr, 1282 address top_address, void * param) { 1283 if (!param) return -1; 1284 1285 if (base_addr <= (address)_locate_jvm_dll && 1286 top_address > (address)_locate_jvm_dll) { 1287 ((address*)param)[0] = base_addr; 1288 ((address*)param)[1] = top_address; 1289 return 1; 1290 } 1291 return 0; 1292 } 1293 1294 address vm_lib_location[2]; // start and end address of jvm.dll 1295 1296 // check if addr is inside jvm.dll 1297 bool os::address_is_in_vm(address addr) { 1298 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1299 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) { 1300 assert(false, "Can't find jvm module."); 1301 return false; 1302 } 1303 } 1304 1305 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1306 } 1307 1308 // print module info; param is outputStream* 1309 static int _print_module(const char* fname, address base_address, 1310 address top_address, void* param) { 1311 if (!param) return -1; 1312 1313 outputStream* st = (outputStream*)param; 1314 1315 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname); 1316 return 0; 1317 } 1318 1319 // Loads .dll/.so and 1320 // in case of error it checks if .dll/.so was built for the 1321 // same architecture as Hotspot is running on 1322 void * os::dll_load(const char *name, char *ebuf, int ebuflen) { 1323 void * result = LoadLibrary(name); 1324 if (result != NULL) { 1325 // Recalculate pdb search path if a DLL was loaded successfully. 1326 SymbolEngine::recalc_search_path(); 1327 return result; 1328 } 1329 1330 DWORD errcode = GetLastError(); 1331 if (errcode == ERROR_MOD_NOT_FOUND) { 1332 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1); 1333 ebuf[ebuflen - 1] = '\0'; 1334 return NULL; 1335 } 1336 1337 // Parsing dll below 1338 // If we can read dll-info and find that dll was built 1339 // for an architecture other than Hotspot is running in 1340 // - then print to buffer "DLL was built for a different architecture" 1341 // else call os::lasterror to obtain system error message 1342 1343 // Read system error message into ebuf 1344 // It may or may not be overwritten below (in the for loop and just above) 1345 lasterror(ebuf, (size_t) ebuflen); 1346 ebuf[ebuflen - 1] = '\0'; 1347 int fd = ::open(name, O_RDONLY | O_BINARY, 0); 1348 if (fd < 0) { 1349 return NULL; 1350 } 1351 1352 uint32_t signature_offset; 1353 uint16_t lib_arch = 0; 1354 bool failed_to_get_lib_arch = 1355 ( // Go to position 3c in the dll 1356 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0) 1357 || 1358 // Read location of signature 1359 (sizeof(signature_offset) != 1360 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset)))) 1361 || 1362 // Go to COFF File Header in dll 1363 // that is located after "signature" (4 bytes long) 1364 (os::seek_to_file_offset(fd, 1365 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0) 1366 || 1367 // Read field that contains code of architecture 1368 // that dll was built for 1369 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch)))) 1370 ); 1371 1372 ::close(fd); 1373 if (failed_to_get_lib_arch) { 1374 // file i/o error - report os::lasterror(...) msg 1375 return NULL; 1376 } 1377 1378 typedef struct { 1379 uint16_t arch_code; 1380 char* arch_name; 1381 } arch_t; 1382 1383 static const arch_t arch_array[] = { 1384 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1385 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"} 1386 }; 1387 #if (defined _M_AMD64) 1388 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64; 1389 #elif (defined _M_IX86) 1390 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386; 1391 #else 1392 #error Method os::dll_load requires that one of following \ 1393 is defined :_M_AMD64 or _M_IX86 1394 #endif 1395 1396 1397 // Obtain a string for printf operation 1398 // lib_arch_str shall contain string what platform this .dll was built for 1399 // running_arch_str shall string contain what platform Hotspot was built for 1400 char *running_arch_str = NULL, *lib_arch_str = NULL; 1401 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) { 1402 if (lib_arch == arch_array[i].arch_code) { 1403 lib_arch_str = arch_array[i].arch_name; 1404 } 1405 if (running_arch == arch_array[i].arch_code) { 1406 running_arch_str = arch_array[i].arch_name; 1407 } 1408 } 1409 1410 assert(running_arch_str, 1411 "Didn't find running architecture code in arch_array"); 1412 1413 // If the architecture is right 1414 // but some other error took place - report os::lasterror(...) msg 1415 if (lib_arch == running_arch) { 1416 return NULL; 1417 } 1418 1419 if (lib_arch_str != NULL) { 1420 ::_snprintf(ebuf, ebuflen - 1, 1421 "Can't load %s-bit .dll on a %s-bit platform", 1422 lib_arch_str, running_arch_str); 1423 } else { 1424 // don't know what architecture this dll was build for 1425 ::_snprintf(ebuf, ebuflen - 1, 1426 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1427 lib_arch, running_arch_str); 1428 } 1429 1430 return NULL; 1431 } 1432 1433 void os::print_dll_info(outputStream *st) { 1434 st->print_cr("Dynamic libraries:"); 1435 get_loaded_modules_info(_print_module, (void *)st); 1436 } 1437 1438 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1439 HANDLE hProcess; 1440 1441 # define MAX_NUM_MODULES 128 1442 HMODULE modules[MAX_NUM_MODULES]; 1443 static char filename[MAX_PATH]; 1444 int result = 0; 1445 1446 int pid = os::current_process_id(); 1447 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1448 FALSE, pid); 1449 if (hProcess == NULL) return 0; 1450 1451 DWORD size_needed; 1452 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) { 1453 CloseHandle(hProcess); 1454 return 0; 1455 } 1456 1457 // number of modules that are currently loaded 1458 int num_modules = size_needed / sizeof(HMODULE); 1459 1460 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1461 // Get Full pathname: 1462 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) { 1463 filename[0] = '\0'; 1464 } 1465 1466 MODULEINFO modinfo; 1467 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) { 1468 modinfo.lpBaseOfDll = NULL; 1469 modinfo.SizeOfImage = 0; 1470 } 1471 1472 // Invoke callback function 1473 result = callback(filename, (address)modinfo.lpBaseOfDll, 1474 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param); 1475 if (result) break; 1476 } 1477 1478 CloseHandle(hProcess); 1479 return result; 1480 } 1481 1482 bool os::get_host_name(char* buf, size_t buflen) { 1483 DWORD size = (DWORD)buflen; 1484 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE); 1485 } 1486 1487 void os::get_summary_os_info(char* buf, size_t buflen) { 1488 stringStream sst(buf, buflen); 1489 os::win32::print_windows_version(&sst); 1490 // chop off newline character 1491 char* nl = strchr(buf, '\n'); 1492 if (nl != NULL) *nl = '\0'; 1493 } 1494 1495 int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) { 1496 int ret = vsnprintf(buf, len, fmt, args); 1497 // Get the correct buffer size if buf is too small 1498 if (ret < 0) { 1499 return _vscprintf(fmt, args); 1500 } 1501 return ret; 1502 } 1503 1504 static inline time_t get_mtime(const char* filename) { 1505 struct stat st; 1506 int ret = os::stat(filename, &st); 1507 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 1508 return st.st_mtime; 1509 } 1510 1511 int os::compare_file_modified_times(const char* file1, const char* file2) { 1512 time_t t1 = get_mtime(file1); 1513 time_t t2 = get_mtime(file2); 1514 return t1 - t2; 1515 } 1516 1517 void os::print_os_info_brief(outputStream* st) { 1518 os::print_os_info(st); 1519 } 1520 1521 void os::print_os_info(outputStream* st) { 1522 #ifdef ASSERT 1523 char buffer[1024]; 1524 st->print("HostName: "); 1525 if (get_host_name(buffer, sizeof(buffer))) { 1526 st->print("%s ", buffer); 1527 } else { 1528 st->print("N/A "); 1529 } 1530 #endif 1531 st->print("OS:"); 1532 os::win32::print_windows_version(st); 1533 } 1534 1535 void os::win32::print_windows_version(outputStream* st) { 1536 OSVERSIONINFOEX osvi; 1537 VS_FIXEDFILEINFO *file_info; 1538 TCHAR kernel32_path[MAX_PATH]; 1539 UINT len, ret; 1540 1541 // Use the GetVersionEx information to see if we're on a server or 1542 // workstation edition of Windows. Starting with Windows 8.1 we can't 1543 // trust the OS version information returned by this API. 1544 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1545 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1546 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1547 st->print_cr("Call to GetVersionEx failed"); 1548 return; 1549 } 1550 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION); 1551 1552 // Get the full path to \Windows\System32\kernel32.dll and use that for 1553 // determining what version of Windows we're running on. 1554 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1; 1555 ret = GetSystemDirectory(kernel32_path, len); 1556 if (ret == 0 || ret > len) { 1557 st->print_cr("Call to GetSystemDirectory failed"); 1558 return; 1559 } 1560 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret); 1561 1562 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL); 1563 if (version_size == 0) { 1564 st->print_cr("Call to GetFileVersionInfoSize failed"); 1565 return; 1566 } 1567 1568 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal); 1569 if (version_info == NULL) { 1570 st->print_cr("Failed to allocate version_info"); 1571 return; 1572 } 1573 1574 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) { 1575 os::free(version_info); 1576 st->print_cr("Call to GetFileVersionInfo failed"); 1577 return; 1578 } 1579 1580 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) { 1581 os::free(version_info); 1582 st->print_cr("Call to VerQueryValue failed"); 1583 return; 1584 } 1585 1586 int major_version = HIWORD(file_info->dwProductVersionMS); 1587 int minor_version = LOWORD(file_info->dwProductVersionMS); 1588 int build_number = HIWORD(file_info->dwProductVersionLS); 1589 int build_minor = LOWORD(file_info->dwProductVersionLS); 1590 int os_vers = major_version * 1000 + minor_version; 1591 os::free(version_info); 1592 1593 st->print(" Windows "); 1594 switch (os_vers) { 1595 1596 case 6000: 1597 if (is_workstation) { 1598 st->print("Vista"); 1599 } else { 1600 st->print("Server 2008"); 1601 } 1602 break; 1603 1604 case 6001: 1605 if (is_workstation) { 1606 st->print("7"); 1607 } else { 1608 st->print("Server 2008 R2"); 1609 } 1610 break; 1611 1612 case 6002: 1613 if (is_workstation) { 1614 st->print("8"); 1615 } else { 1616 st->print("Server 2012"); 1617 } 1618 break; 1619 1620 case 6003: 1621 if (is_workstation) { 1622 st->print("8.1"); 1623 } else { 1624 st->print("Server 2012 R2"); 1625 } 1626 break; 1627 1628 case 10000: 1629 if (is_workstation) { 1630 st->print("10"); 1631 } else { 1632 st->print("Server 2016"); 1633 } 1634 break; 1635 1636 default: 1637 // Unrecognized windows, print out its major and minor versions 1638 st->print("%d.%d", major_version, minor_version); 1639 break; 1640 } 1641 1642 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1643 // find out whether we are running on 64 bit processor or not 1644 SYSTEM_INFO si; 1645 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1646 GetNativeSystemInfo(&si); 1647 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1648 st->print(" , 64 bit"); 1649 } 1650 1651 st->print(" Build %d", build_number); 1652 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor); 1653 st->cr(); 1654 } 1655 1656 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1657 // Nothing to do for now. 1658 } 1659 1660 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1661 HKEY key; 1662 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE, 1663 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key); 1664 if (status == ERROR_SUCCESS) { 1665 DWORD size = (DWORD)buflen; 1666 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size); 1667 if (status != ERROR_SUCCESS) { 1668 strncpy(buf, "## __CPU__", buflen); 1669 } 1670 RegCloseKey(key); 1671 } else { 1672 // Put generic cpu info to return 1673 strncpy(buf, "## __CPU__", buflen); 1674 } 1675 } 1676 1677 void os::print_memory_info(outputStream* st) { 1678 st->print("Memory:"); 1679 st->print(" %dk page", os::vm_page_size()>>10); 1680 1681 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1682 // value if total memory is larger than 4GB 1683 MEMORYSTATUSEX ms; 1684 ms.dwLength = sizeof(ms); 1685 GlobalMemoryStatusEx(&ms); 1686 1687 st->print(", physical %uk", os::physical_memory() >> 10); 1688 st->print("(%uk free)", os::available_memory() >> 10); 1689 1690 st->print(", swap %uk", ms.ullTotalPageFile >> 10); 1691 st->print("(%uk free)", ms.ullAvailPageFile >> 10); 1692 st->cr(); 1693 } 1694 1695 void os::print_siginfo(outputStream *st, const void* siginfo) { 1696 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo; 1697 st->print("siginfo:"); 1698 1699 char tmp[64]; 1700 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) { 1701 strcpy(tmp, "EXCEPTION_??"); 1702 } 1703 st->print(" %s (0x%x)", tmp, er->ExceptionCode); 1704 1705 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION || 1706 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) && 1707 er->NumberParameters >= 2) { 1708 switch (er->ExceptionInformation[0]) { 1709 case 0: st->print(", reading address"); break; 1710 case 1: st->print(", writing address"); break; 1711 case 8: st->print(", data execution prevention violation at address"); break; 1712 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1713 er->ExceptionInformation[0]); 1714 } 1715 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1716 } else { 1717 int num = er->NumberParameters; 1718 if (num > 0) { 1719 st->print(", ExceptionInformation="); 1720 for (int i = 0; i < num; i++) { 1721 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1722 } 1723 } 1724 } 1725 st->cr(); 1726 } 1727 1728 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1729 // do nothing 1730 } 1731 1732 static char saved_jvm_path[MAX_PATH] = {0}; 1733 1734 // Find the full path to the current module, jvm.dll 1735 void os::jvm_path(char *buf, jint buflen) { 1736 // Error checking. 1737 if (buflen < MAX_PATH) { 1738 assert(false, "must use a large-enough buffer"); 1739 buf[0] = '\0'; 1740 return; 1741 } 1742 // Lazy resolve the path to current module. 1743 if (saved_jvm_path[0] != 0) { 1744 strcpy(buf, saved_jvm_path); 1745 return; 1746 } 1747 1748 buf[0] = '\0'; 1749 if (Arguments::sun_java_launcher_is_altjvm()) { 1750 // Support for the java launcher's '-XXaltjvm=<path>' option. Check 1751 // for a JAVA_HOME environment variable and fix up the path so it 1752 // looks like jvm.dll is installed there (append a fake suffix 1753 // hotspot/jvm.dll). 1754 char* java_home_var = ::getenv("JAVA_HOME"); 1755 if (java_home_var != NULL && java_home_var[0] != 0 && 1756 strlen(java_home_var) < (size_t)buflen) { 1757 strncpy(buf, java_home_var, buflen); 1758 1759 // determine if this is a legacy image or modules image 1760 // modules image doesn't have "jre" subdirectory 1761 size_t len = strlen(buf); 1762 char* jrebin_p = buf + len; 1763 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1764 if (0 != _access(buf, 0)) { 1765 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1766 } 1767 len = strlen(buf); 1768 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1769 } 1770 } 1771 1772 if (buf[0] == '\0') { 1773 GetModuleFileName(vm_lib_handle, buf, buflen); 1774 } 1775 strncpy(saved_jvm_path, buf, MAX_PATH); 1776 saved_jvm_path[MAX_PATH - 1] = '\0'; 1777 } 1778 1779 1780 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1781 #ifndef _WIN64 1782 st->print("_"); 1783 #endif 1784 } 1785 1786 1787 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1788 #ifndef _WIN64 1789 st->print("@%d", args_size * sizeof(int)); 1790 #endif 1791 } 1792 1793 // This method is a copy of JDK's sysGetLastErrorString 1794 // from src/windows/hpi/src/system_md.c 1795 1796 size_t os::lasterror(char* buf, size_t len) { 1797 DWORD errval; 1798 1799 if ((errval = GetLastError()) != 0) { 1800 // DOS error 1801 size_t n = (size_t)FormatMessage( 1802 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1803 NULL, 1804 errval, 1805 0, 1806 buf, 1807 (DWORD)len, 1808 NULL); 1809 if (n > 3) { 1810 // Drop final '.', CR, LF 1811 if (buf[n - 1] == '\n') n--; 1812 if (buf[n - 1] == '\r') n--; 1813 if (buf[n - 1] == '.') n--; 1814 buf[n] = '\0'; 1815 } 1816 return n; 1817 } 1818 1819 if (errno != 0) { 1820 // C runtime error that has no corresponding DOS error code 1821 const char* s = os::strerror(errno); 1822 size_t n = strlen(s); 1823 if (n >= len) n = len - 1; 1824 strncpy(buf, s, n); 1825 buf[n] = '\0'; 1826 return n; 1827 } 1828 1829 return 0; 1830 } 1831 1832 int os::get_last_error() { 1833 DWORD error = GetLastError(); 1834 if (error == 0) { 1835 error = errno; 1836 } 1837 return (int)error; 1838 } 1839 1840 WindowsSemaphore::WindowsSemaphore(uint value) { 1841 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL); 1842 1843 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError()); 1844 } 1845 1846 WindowsSemaphore::~WindowsSemaphore() { 1847 ::CloseHandle(_semaphore); 1848 } 1849 1850 void WindowsSemaphore::signal(uint count) { 1851 if (count > 0) { 1852 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL); 1853 1854 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError()); 1855 } 1856 } 1857 1858 void WindowsSemaphore::wait() { 1859 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE); 1860 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError()); 1861 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret); 1862 } 1863 1864 bool WindowsSemaphore::trywait() { 1865 DWORD ret = ::WaitForSingleObject(_semaphore, 0); 1866 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError()); 1867 return ret == WAIT_OBJECT_0; 1868 } 1869 1870 // sun.misc.Signal 1871 // NOTE that this is a workaround for an apparent kernel bug where if 1872 // a signal handler for SIGBREAK is installed then that signal handler 1873 // takes priority over the console control handler for CTRL_CLOSE_EVENT. 1874 // See bug 4416763. 1875 static void (*sigbreakHandler)(int) = NULL; 1876 1877 static void UserHandler(int sig, void *siginfo, void *context) { 1878 os::signal_notify(sig); 1879 // We need to reinstate the signal handler each time... 1880 os::signal(sig, (void*)UserHandler); 1881 } 1882 1883 void* os::user_handler() { 1884 return (void*) UserHandler; 1885 } 1886 1887 void* os::signal(int signal_number, void* handler) { 1888 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1889 void (*oldHandler)(int) = sigbreakHandler; 1890 sigbreakHandler = (void (*)(int)) handler; 1891 return (void*) oldHandler; 1892 } else { 1893 return (void*)::signal(signal_number, (void (*)(int))handler); 1894 } 1895 } 1896 1897 void os::signal_raise(int signal_number) { 1898 raise(signal_number); 1899 } 1900 1901 // The Win32 C runtime library maps all console control events other than ^C 1902 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1903 // logoff, and shutdown events. We therefore install our own console handler 1904 // that raises SIGTERM for the latter cases. 1905 // 1906 static BOOL WINAPI consoleHandler(DWORD event) { 1907 switch (event) { 1908 case CTRL_C_EVENT: 1909 if (VMError::is_error_reported()) { 1910 // Ctrl-C is pressed during error reporting, likely because the error 1911 // handler fails to abort. Let VM die immediately. 1912 os::die(); 1913 } 1914 1915 os::signal_raise(SIGINT); 1916 return TRUE; 1917 break; 1918 case CTRL_BREAK_EVENT: 1919 if (sigbreakHandler != NULL) { 1920 (*sigbreakHandler)(SIGBREAK); 1921 } 1922 return TRUE; 1923 break; 1924 case CTRL_LOGOFF_EVENT: { 1925 // Don't terminate JVM if it is running in a non-interactive session, 1926 // such as a service process. 1927 USEROBJECTFLAGS flags; 1928 HANDLE handle = GetProcessWindowStation(); 1929 if (handle != NULL && 1930 GetUserObjectInformation(handle, UOI_FLAGS, &flags, 1931 sizeof(USEROBJECTFLAGS), NULL)) { 1932 // If it is a non-interactive session, let next handler to deal 1933 // with it. 1934 if ((flags.dwFlags & WSF_VISIBLE) == 0) { 1935 return FALSE; 1936 } 1937 } 1938 } 1939 case CTRL_CLOSE_EVENT: 1940 case CTRL_SHUTDOWN_EVENT: 1941 os::signal_raise(SIGTERM); 1942 return TRUE; 1943 break; 1944 default: 1945 break; 1946 } 1947 return FALSE; 1948 } 1949 1950 // The following code is moved from os.cpp for making this 1951 // code platform specific, which it is by its very nature. 1952 1953 // Return maximum OS signal used + 1 for internal use only 1954 // Used as exit signal for signal_thread 1955 int os::sigexitnum_pd() { 1956 return NSIG; 1957 } 1958 1959 // a counter for each possible signal value, including signal_thread exit signal 1960 static volatile jint pending_signals[NSIG+1] = { 0 }; 1961 static HANDLE sig_sem = NULL; 1962 1963 void os::signal_init_pd() { 1964 // Initialize signal structures 1965 memset((void*)pending_signals, 0, sizeof(pending_signals)); 1966 1967 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 1968 1969 // Programs embedding the VM do not want it to attempt to receive 1970 // events like CTRL_LOGOFF_EVENT, which are used to implement the 1971 // shutdown hooks mechanism introduced in 1.3. For example, when 1972 // the VM is run as part of a Windows NT service (i.e., a servlet 1973 // engine in a web server), the correct behavior is for any console 1974 // control handler to return FALSE, not TRUE, because the OS's 1975 // "final" handler for such events allows the process to continue if 1976 // it is a service (while terminating it if it is not a service). 1977 // To make this behavior uniform and the mechanism simpler, we 1978 // completely disable the VM's usage of these console events if -Xrs 1979 // (=ReduceSignalUsage) is specified. This means, for example, that 1980 // the CTRL-BREAK thread dump mechanism is also disabled in this 1981 // case. See bugs 4323062, 4345157, and related bugs. 1982 1983 if (!ReduceSignalUsage) { 1984 // Add a CTRL-C handler 1985 SetConsoleCtrlHandler(consoleHandler, TRUE); 1986 } 1987 } 1988 1989 void os::signal_notify(int signal_number) { 1990 BOOL ret; 1991 if (sig_sem != NULL) { 1992 Atomic::inc(&pending_signals[signal_number]); 1993 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 1994 assert(ret != 0, "ReleaseSemaphore() failed"); 1995 } 1996 } 1997 1998 static int check_pending_signals(bool wait_for_signal) { 1999 DWORD ret; 2000 while (true) { 2001 for (int i = 0; i < NSIG + 1; i++) { 2002 jint n = pending_signals[i]; 2003 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2004 return i; 2005 } 2006 } 2007 if (!wait_for_signal) { 2008 return -1; 2009 } 2010 2011 JavaThread *thread = JavaThread::current(); 2012 2013 ThreadBlockInVM tbivm(thread); 2014 2015 bool threadIsSuspended; 2016 do { 2017 thread->set_suspend_equivalent(); 2018 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2019 ret = ::WaitForSingleObject(sig_sem, INFINITE); 2020 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 2021 2022 // were we externally suspended while we were waiting? 2023 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2024 if (threadIsSuspended) { 2025 // The semaphore has been incremented, but while we were waiting 2026 // another thread suspended us. We don't want to continue running 2027 // while suspended because that would surprise the thread that 2028 // suspended us. 2029 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2030 assert(ret != 0, "ReleaseSemaphore() failed"); 2031 2032 thread->java_suspend_self(); 2033 } 2034 } while (threadIsSuspended); 2035 } 2036 } 2037 2038 int os::signal_lookup() { 2039 return check_pending_signals(false); 2040 } 2041 2042 int os::signal_wait() { 2043 return check_pending_signals(true); 2044 } 2045 2046 // Implicit OS exception handling 2047 2048 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, 2049 address handler) { 2050 JavaThread* thread = (JavaThread*) Thread::current_or_null(); 2051 // Save pc in thread 2052 #ifdef _M_AMD64 2053 // Do not blow up if no thread info available. 2054 if (thread) { 2055 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip); 2056 } 2057 // Set pc to handler 2058 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 2059 #else 2060 // Do not blow up if no thread info available. 2061 if (thread) { 2062 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip); 2063 } 2064 // Set pc to handler 2065 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler; 2066 #endif 2067 2068 // Continue the execution 2069 return EXCEPTION_CONTINUE_EXECUTION; 2070 } 2071 2072 2073 // Used for PostMortemDump 2074 extern "C" void safepoints(); 2075 extern "C" void find(int x); 2076 extern "C" void events(); 2077 2078 // According to Windows API documentation, an illegal instruction sequence should generate 2079 // the 0xC000001C exception code. However, real world experience shows that occasionnaly 2080 // the execution of an illegal instruction can generate the exception code 0xC000001E. This 2081 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 2082 2083 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 2084 2085 // From "Execution Protection in the Windows Operating System" draft 0.35 2086 // Once a system header becomes available, the "real" define should be 2087 // included or copied here. 2088 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2089 2090 // Windows Vista/2008 heap corruption check 2091 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374 2092 2093 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual 2094 // C++ compiler contain this error code. Because this is a compiler-generated 2095 // error, the code is not listed in the Win32 API header files. 2096 // The code is actually a cryptic mnemonic device, with the initial "E" 2097 // standing for "exception" and the final 3 bytes (0x6D7363) representing the 2098 // ASCII values of "msc". 2099 2100 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363 2101 2102 #define def_excpt(val) { #val, (val) } 2103 2104 static const struct { char* name; uint number; } exceptlabels[] = { 2105 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2106 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2107 def_excpt(EXCEPTION_BREAKPOINT), 2108 def_excpt(EXCEPTION_SINGLE_STEP), 2109 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2110 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2111 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2112 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2113 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2114 def_excpt(EXCEPTION_FLT_OVERFLOW), 2115 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2116 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2117 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2118 def_excpt(EXCEPTION_INT_OVERFLOW), 2119 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2120 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2121 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2122 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2123 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2124 def_excpt(EXCEPTION_STACK_OVERFLOW), 2125 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2126 def_excpt(EXCEPTION_GUARD_PAGE), 2127 def_excpt(EXCEPTION_INVALID_HANDLE), 2128 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION), 2129 def_excpt(EXCEPTION_HEAP_CORRUPTION) 2130 }; 2131 2132 #undef def_excpt 2133 2134 const char* os::exception_name(int exception_code, char *buf, size_t size) { 2135 uint code = static_cast<uint>(exception_code); 2136 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) { 2137 if (exceptlabels[i].number == code) { 2138 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2139 return buf; 2140 } 2141 } 2142 2143 return NULL; 2144 } 2145 2146 //----------------------------------------------------------------------------- 2147 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2148 // handle exception caused by idiv; should only happen for -MinInt/-1 2149 // (division by zero is handled explicitly) 2150 #ifdef _M_AMD64 2151 PCONTEXT ctx = exceptionInfo->ContextRecord; 2152 address pc = (address)ctx->Rip; 2153 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode"); 2154 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2155 if (pc[0] == 0xF7) { 2156 // set correct result values and continue after idiv instruction 2157 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes 2158 } else { 2159 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes 2160 } 2161 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation) 2162 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the 2163 // idiv opcode (0xF7). 2164 ctx->Rdx = (DWORD)0; // remainder 2165 // Continue the execution 2166 #else 2167 PCONTEXT ctx = exceptionInfo->ContextRecord; 2168 address pc = (address)ctx->Eip; 2169 assert(pc[0] == 0xF7, "not an idiv opcode"); 2170 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2171 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2172 // set correct result values and continue after idiv instruction 2173 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2174 ctx->Eax = (DWORD)min_jint; // result 2175 ctx->Edx = (DWORD)0; // remainder 2176 // Continue the execution 2177 #endif 2178 return EXCEPTION_CONTINUE_EXECUTION; 2179 } 2180 2181 //----------------------------------------------------------------------------- 2182 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2183 PCONTEXT ctx = exceptionInfo->ContextRecord; 2184 #ifndef _WIN64 2185 // handle exception caused by native method modifying control word 2186 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2187 2188 switch (exception_code) { 2189 case EXCEPTION_FLT_DENORMAL_OPERAND: 2190 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2191 case EXCEPTION_FLT_INEXACT_RESULT: 2192 case EXCEPTION_FLT_INVALID_OPERATION: 2193 case EXCEPTION_FLT_OVERFLOW: 2194 case EXCEPTION_FLT_STACK_CHECK: 2195 case EXCEPTION_FLT_UNDERFLOW: 2196 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2197 if (fp_control_word != ctx->FloatSave.ControlWord) { 2198 // Restore FPCW and mask out FLT exceptions 2199 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2200 // Mask out pending FLT exceptions 2201 ctx->FloatSave.StatusWord &= 0xffffff00; 2202 return EXCEPTION_CONTINUE_EXECUTION; 2203 } 2204 } 2205 2206 if (prev_uef_handler != NULL) { 2207 // We didn't handle this exception so pass it to the previous 2208 // UnhandledExceptionFilter. 2209 return (prev_uef_handler)(exceptionInfo); 2210 } 2211 #else // !_WIN64 2212 // On Windows, the mxcsr control bits are non-volatile across calls 2213 // See also CR 6192333 2214 // 2215 jint MxCsr = INITIAL_MXCSR; 2216 // we can't use StubRoutines::addr_mxcsr_std() 2217 // because in Win64 mxcsr is not saved there 2218 if (MxCsr != ctx->MxCsr) { 2219 ctx->MxCsr = MxCsr; 2220 return EXCEPTION_CONTINUE_EXECUTION; 2221 } 2222 #endif // !_WIN64 2223 2224 return EXCEPTION_CONTINUE_SEARCH; 2225 } 2226 2227 static inline void report_error(Thread* t, DWORD exception_code, 2228 address addr, void* siginfo, void* context) { 2229 VMError::report_and_die(t, exception_code, addr, siginfo, context); 2230 2231 // If UseOsErrorReporting, this will return here and save the error file 2232 // somewhere where we can find it in the minidump. 2233 } 2234 2235 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread, 2236 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) { 2237 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2238 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2239 if (Interpreter::contains(pc)) { 2240 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord); 2241 if (!fr->is_first_java_frame()) { 2242 // get_frame_at_stack_banging_point() is only called when we 2243 // have well defined stacks so java_sender() calls do not need 2244 // to assert safe_for_sender() first. 2245 *fr = fr->java_sender(); 2246 } 2247 } else { 2248 // more complex code with compiled code 2249 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above"); 2250 CodeBlob* cb = CodeCache::find_blob(pc); 2251 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) { 2252 // Not sure where the pc points to, fallback to default 2253 // stack overflow handling 2254 return false; 2255 } else { 2256 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord); 2257 // in compiled code, the stack banging is performed just after the return pc 2258 // has been pushed on the stack 2259 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp())); 2260 if (!fr->is_java_frame()) { 2261 // See java_sender() comment above. 2262 *fr = fr->java_sender(); 2263 } 2264 } 2265 } 2266 assert(fr->is_java_frame(), "Safety check"); 2267 return true; 2268 } 2269 2270 //----------------------------------------------------------------------------- 2271 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2272 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2273 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2274 #ifdef _M_AMD64 2275 address pc = (address) exceptionInfo->ContextRecord->Rip; 2276 #else 2277 address pc = (address) exceptionInfo->ContextRecord->Eip; 2278 #endif 2279 Thread* t = Thread::current_or_null_safe(); 2280 2281 // Handle SafeFetch32 and SafeFetchN exceptions. 2282 if (StubRoutines::is_safefetch_fault(pc)) { 2283 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc)); 2284 } 2285 2286 #ifndef _WIN64 2287 // Execution protection violation - win32 running on AMD64 only 2288 // Handled first to avoid misdiagnosis as a "normal" access violation; 2289 // This is safe to do because we have a new/unique ExceptionInformation 2290 // code for this condition. 2291 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2292 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2293 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2294 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2295 2296 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2297 int page_size = os::vm_page_size(); 2298 2299 // Make sure the pc and the faulting address are sane. 2300 // 2301 // If an instruction spans a page boundary, and the page containing 2302 // the beginning of the instruction is executable but the following 2303 // page is not, the pc and the faulting address might be slightly 2304 // different - we still want to unguard the 2nd page in this case. 2305 // 2306 // 15 bytes seems to be a (very) safe value for max instruction size. 2307 bool pc_is_near_addr = 2308 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2309 bool instr_spans_page_boundary = 2310 (align_down((intptr_t) pc ^ (intptr_t) addr, 2311 (intptr_t) page_size) > 0); 2312 2313 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2314 static volatile address last_addr = 2315 (address) os::non_memory_address_word(); 2316 2317 // In conservative mode, don't unguard unless the address is in the VM 2318 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2319 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2320 2321 // Set memory to RWX and retry 2322 address page_start = align_down(addr, page_size); 2323 bool res = os::protect_memory((char*) page_start, page_size, 2324 os::MEM_PROT_RWX); 2325 2326 log_debug(os)("Execution protection violation " 2327 "at " INTPTR_FORMAT 2328 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr), 2329 p2i(page_start), (res ? "success" : os::strerror(errno))); 2330 2331 // Set last_addr so if we fault again at the same address, we don't 2332 // end up in an endless loop. 2333 // 2334 // There are two potential complications here. Two threads trapping 2335 // at the same address at the same time could cause one of the 2336 // threads to think it already unguarded, and abort the VM. Likely 2337 // very rare. 2338 // 2339 // The other race involves two threads alternately trapping at 2340 // different addresses and failing to unguard the page, resulting in 2341 // an endless loop. This condition is probably even more unlikely 2342 // than the first. 2343 // 2344 // Although both cases could be avoided by using locks or thread 2345 // local last_addr, these solutions are unnecessary complication: 2346 // this handler is a best-effort safety net, not a complete solution. 2347 // It is disabled by default and should only be used as a workaround 2348 // in case we missed any no-execute-unsafe VM code. 2349 2350 last_addr = addr; 2351 2352 return EXCEPTION_CONTINUE_EXECUTION; 2353 } 2354 } 2355 2356 // Last unguard failed or not unguarding 2357 tty->print_raw_cr("Execution protection violation"); 2358 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2359 exceptionInfo->ContextRecord); 2360 return EXCEPTION_CONTINUE_SEARCH; 2361 } 2362 } 2363 #endif // _WIN64 2364 2365 // Check to see if we caught the safepoint code in the 2366 // process of write protecting the memory serialization page. 2367 // It write enables the page immediately after protecting it 2368 // so just return. 2369 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2370 if (t != NULL && t->is_Java_thread()) { 2371 JavaThread* thread = (JavaThread*) t; 2372 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2373 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2374 if (os::is_memory_serialize_page(thread, addr)) { 2375 // Block current thread until the memory serialize page permission restored. 2376 os::block_on_serialize_page_trap(); 2377 return EXCEPTION_CONTINUE_EXECUTION; 2378 } 2379 } 2380 } 2381 2382 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) && 2383 VM_Version::is_cpuinfo_segv_addr(pc)) { 2384 // Verify that OS save/restore AVX registers. 2385 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr()); 2386 } 2387 2388 if (t != NULL && t->is_Java_thread()) { 2389 JavaThread* thread = (JavaThread*) t; 2390 bool in_java = thread->thread_state() == _thread_in_Java; 2391 2392 // Handle potential stack overflows up front. 2393 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2394 if (thread->stack_guards_enabled()) { 2395 if (in_java) { 2396 frame fr; 2397 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2398 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2399 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) { 2400 assert(fr.is_java_frame(), "Must be a Java frame"); 2401 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr); 2402 } 2403 } 2404 // Yellow zone violation. The o/s has unprotected the first yellow 2405 // zone page for us. Note: must call disable_stack_yellow_zone to 2406 // update the enabled status, even if the zone contains only one page. 2407 assert(thread->thread_state() != _thread_in_vm, "Undersized StackShadowPages"); 2408 thread->disable_stack_yellow_reserved_zone(); 2409 // If not in java code, return and hope for the best. 2410 return in_java 2411 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2412 : EXCEPTION_CONTINUE_EXECUTION; 2413 } else { 2414 // Fatal red zone violation. 2415 thread->disable_stack_red_zone(); 2416 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2417 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2418 exceptionInfo->ContextRecord); 2419 return EXCEPTION_CONTINUE_SEARCH; 2420 } 2421 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2422 // Either stack overflow or null pointer exception. 2423 if (in_java) { 2424 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2425 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2426 address stack_end = thread->stack_end(); 2427 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2428 // Stack overflow. 2429 assert(!os::uses_stack_guard_pages(), 2430 "should be caught by red zone code above."); 2431 return Handle_Exception(exceptionInfo, 2432 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2433 } 2434 // Check for safepoint polling and implicit null 2435 // We only expect null pointers in the stubs (vtable) 2436 // the rest are checked explicitly now. 2437 CodeBlob* cb = CodeCache::find_blob(pc); 2438 if (cb != NULL) { 2439 if (os::is_poll_address(addr)) { 2440 address stub = SharedRuntime::get_poll_stub(pc); 2441 return Handle_Exception(exceptionInfo, stub); 2442 } 2443 } 2444 { 2445 #ifdef _WIN64 2446 // If it's a legal stack address map the entire region in 2447 // 2448 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2449 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2450 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) { 2451 addr = (address)((uintptr_t)addr & 2452 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2453 os::commit_memory((char *)addr, thread->stack_base() - addr, 2454 !ExecMem); 2455 return EXCEPTION_CONTINUE_EXECUTION; 2456 } else 2457 #endif 2458 { 2459 // Null pointer exception. 2460 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr)) { 2461 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2462 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2463 } 2464 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2465 exceptionInfo->ContextRecord); 2466 return EXCEPTION_CONTINUE_SEARCH; 2467 } 2468 } 2469 } 2470 2471 #ifdef _WIN64 2472 // Special care for fast JNI field accessors. 2473 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2474 // in and the heap gets shrunk before the field access. 2475 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2476 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2477 if (addr != (address)-1) { 2478 return Handle_Exception(exceptionInfo, addr); 2479 } 2480 } 2481 #endif 2482 2483 // Stack overflow or null pointer exception in native code. 2484 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2485 exceptionInfo->ContextRecord); 2486 return EXCEPTION_CONTINUE_SEARCH; 2487 } // /EXCEPTION_ACCESS_VIOLATION 2488 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2489 2490 if (in_java) { 2491 switch (exception_code) { 2492 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2493 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2494 2495 case EXCEPTION_INT_OVERFLOW: 2496 return Handle_IDiv_Exception(exceptionInfo); 2497 2498 } // switch 2499 } 2500 if (((thread->thread_state() == _thread_in_Java) || 2501 (thread->thread_state() == _thread_in_native)) && 2502 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) { 2503 LONG result=Handle_FLT_Exception(exceptionInfo); 2504 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2505 } 2506 } 2507 2508 if (exception_code != EXCEPTION_BREAKPOINT) { 2509 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2510 exceptionInfo->ContextRecord); 2511 } 2512 return EXCEPTION_CONTINUE_SEARCH; 2513 } 2514 2515 #ifndef _WIN64 2516 // Special care for fast JNI accessors. 2517 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2518 // the heap gets shrunk before the field access. 2519 // Need to install our own structured exception handler since native code may 2520 // install its own. 2521 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2522 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2523 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2524 address pc = (address) exceptionInfo->ContextRecord->Eip; 2525 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2526 if (addr != (address)-1) { 2527 return Handle_Exception(exceptionInfo, addr); 2528 } 2529 } 2530 return EXCEPTION_CONTINUE_SEARCH; 2531 } 2532 2533 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \ 2534 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \ 2535 jobject obj, \ 2536 jfieldID fieldID) { \ 2537 __try { \ 2538 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \ 2539 obj, \ 2540 fieldID); \ 2541 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \ 2542 _exception_info())) { \ 2543 } \ 2544 return 0; \ 2545 } 2546 2547 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2548 DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2549 DEFINE_FAST_GETFIELD(jchar, char, Char) 2550 DEFINE_FAST_GETFIELD(jshort, short, Short) 2551 DEFINE_FAST_GETFIELD(jint, int, Int) 2552 DEFINE_FAST_GETFIELD(jlong, long, Long) 2553 DEFINE_FAST_GETFIELD(jfloat, float, Float) 2554 DEFINE_FAST_GETFIELD(jdouble, double, Double) 2555 2556 address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2557 switch (type) { 2558 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2559 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2560 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2561 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2562 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2563 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2564 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2565 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2566 default: ShouldNotReachHere(); 2567 } 2568 return (address)-1; 2569 } 2570 #endif 2571 2572 // Virtual Memory 2573 2574 int os::vm_page_size() { return os::win32::vm_page_size(); } 2575 int os::vm_allocation_granularity() { 2576 return os::win32::vm_allocation_granularity(); 2577 } 2578 2579 // Windows large page support is available on Windows 2003. In order to use 2580 // large page memory, the administrator must first assign additional privilege 2581 // to the user: 2582 // + select Control Panel -> Administrative Tools -> Local Security Policy 2583 // + select Local Policies -> User Rights Assignment 2584 // + double click "Lock pages in memory", add users and/or groups 2585 // + reboot 2586 // Note the above steps are needed for administrator as well, as administrators 2587 // by default do not have the privilege to lock pages in memory. 2588 // 2589 // Note about Windows 2003: although the API supports committing large page 2590 // memory on a page-by-page basis and VirtualAlloc() returns success under this 2591 // scenario, I found through experiment it only uses large page if the entire 2592 // memory region is reserved and committed in a single VirtualAlloc() call. 2593 // This makes Windows large page support more or less like Solaris ISM, in 2594 // that the entire heap must be committed upfront. This probably will change 2595 // in the future, if so the code below needs to be revisited. 2596 2597 #ifndef MEM_LARGE_PAGES 2598 #define MEM_LARGE_PAGES 0x20000000 2599 #endif 2600 2601 static HANDLE _hProcess; 2602 static HANDLE _hToken; 2603 2604 // Container for NUMA node list info 2605 class NUMANodeListHolder { 2606 private: 2607 int *_numa_used_node_list; // allocated below 2608 int _numa_used_node_count; 2609 2610 void free_node_list() { 2611 if (_numa_used_node_list != NULL) { 2612 FREE_C_HEAP_ARRAY(int, _numa_used_node_list); 2613 } 2614 } 2615 2616 public: 2617 NUMANodeListHolder() { 2618 _numa_used_node_count = 0; 2619 _numa_used_node_list = NULL; 2620 // do rest of initialization in build routine (after function pointers are set up) 2621 } 2622 2623 ~NUMANodeListHolder() { 2624 free_node_list(); 2625 } 2626 2627 bool build() { 2628 DWORD_PTR proc_aff_mask; 2629 DWORD_PTR sys_aff_mask; 2630 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false; 2631 ULONG highest_node_number; 2632 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false; 2633 free_node_list(); 2634 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal); 2635 for (unsigned int i = 0; i <= highest_node_number; i++) { 2636 ULONGLONG proc_mask_numa_node; 2637 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false; 2638 if ((proc_aff_mask & proc_mask_numa_node)!=0) { 2639 _numa_used_node_list[_numa_used_node_count++] = i; 2640 } 2641 } 2642 return (_numa_used_node_count > 1); 2643 } 2644 2645 int get_count() { return _numa_used_node_count; } 2646 int get_node_list_entry(int n) { 2647 // for indexes out of range, returns -1 2648 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1); 2649 } 2650 2651 } numa_node_list_holder; 2652 2653 2654 2655 static size_t _large_page_size = 0; 2656 2657 static bool request_lock_memory_privilege() { 2658 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2659 os::current_process_id()); 2660 2661 LUID luid; 2662 if (_hProcess != NULL && 2663 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2664 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2665 2666 TOKEN_PRIVILEGES tp; 2667 tp.PrivilegeCount = 1; 2668 tp.Privileges[0].Luid = luid; 2669 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2670 2671 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2672 // privilege. Check GetLastError() too. See MSDN document. 2673 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2674 (GetLastError() == ERROR_SUCCESS)) { 2675 return true; 2676 } 2677 } 2678 2679 return false; 2680 } 2681 2682 static void cleanup_after_large_page_init() { 2683 if (_hProcess) CloseHandle(_hProcess); 2684 _hProcess = NULL; 2685 if (_hToken) CloseHandle(_hToken); 2686 _hToken = NULL; 2687 } 2688 2689 static bool numa_interleaving_init() { 2690 bool success = false; 2691 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving); 2692 2693 // print a warning if UseNUMAInterleaving flag is specified on command line 2694 bool warn_on_failure = use_numa_interleaving_specified; 2695 #define WARN(msg) if (warn_on_failure) { warning(msg); } 2696 2697 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages) 2698 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2699 NUMAInterleaveGranularity = align_up(NUMAInterleaveGranularity, min_interleave_granularity); 2700 2701 if (numa_node_list_holder.build()) { 2702 if (log_is_enabled(Debug, os, cpu)) { 2703 Log(os, cpu) log; 2704 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count()); 2705 for (int i = 0; i < numa_node_list_holder.get_count(); i++) { 2706 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i)); 2707 } 2708 } 2709 success = true; 2710 } else { 2711 WARN("Process does not cover multiple NUMA nodes."); 2712 } 2713 if (!success) { 2714 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag."); 2715 } 2716 return success; 2717 #undef WARN 2718 } 2719 2720 // this routine is used whenever we need to reserve a contiguous VA range 2721 // but we need to make separate VirtualAlloc calls for each piece of the range 2722 // Reasons for doing this: 2723 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise) 2724 // * UseNUMAInterleaving requires a separate node for each piece 2725 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, 2726 DWORD prot, 2727 bool should_inject_error = false) { 2728 char * p_buf; 2729 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size 2730 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2731 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size; 2732 2733 // first reserve enough address space in advance since we want to be 2734 // able to break a single contiguous virtual address range into multiple 2735 // large page commits but WS2003 does not allow reserving large page space 2736 // so we just use 4K pages for reserve, this gives us a legal contiguous 2737 // address space. then we will deallocate that reservation, and re alloc 2738 // using large pages 2739 const size_t size_of_reserve = bytes + chunk_size; 2740 if (bytes > size_of_reserve) { 2741 // Overflowed. 2742 return NULL; 2743 } 2744 p_buf = (char *) VirtualAlloc(addr, 2745 size_of_reserve, // size of Reserve 2746 MEM_RESERVE, 2747 PAGE_READWRITE); 2748 // If reservation failed, return NULL 2749 if (p_buf == NULL) return NULL; 2750 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC); 2751 os::release_memory(p_buf, bytes + chunk_size); 2752 2753 // we still need to round up to a page boundary (in case we are using large pages) 2754 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size) 2755 // instead we handle this in the bytes_to_rq computation below 2756 p_buf = align_up(p_buf, page_size); 2757 2758 // now go through and allocate one chunk at a time until all bytes are 2759 // allocated 2760 size_t bytes_remaining = bytes; 2761 // An overflow of align_up() would have been caught above 2762 // in the calculation of size_of_reserve. 2763 char * next_alloc_addr = p_buf; 2764 HANDLE hProc = GetCurrentProcess(); 2765 2766 #ifdef ASSERT 2767 // Variable for the failure injection 2768 int ran_num = os::random(); 2769 size_t fail_after = ran_num % bytes; 2770 #endif 2771 2772 int count=0; 2773 while (bytes_remaining) { 2774 // select bytes_to_rq to get to the next chunk_size boundary 2775 2776 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size)); 2777 // Note allocate and commit 2778 char * p_new; 2779 2780 #ifdef ASSERT 2781 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after); 2782 #else 2783 const bool inject_error_now = false; 2784 #endif 2785 2786 if (inject_error_now) { 2787 p_new = NULL; 2788 } else { 2789 if (!UseNUMAInterleaving) { 2790 p_new = (char *) VirtualAlloc(next_alloc_addr, 2791 bytes_to_rq, 2792 flags, 2793 prot); 2794 } else { 2795 // get the next node to use from the used_node_list 2796 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected"); 2797 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count()); 2798 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node); 2799 } 2800 } 2801 2802 if (p_new == NULL) { 2803 // Free any allocated pages 2804 if (next_alloc_addr > p_buf) { 2805 // Some memory was committed so release it. 2806 size_t bytes_to_release = bytes - bytes_remaining; 2807 // NMT has yet to record any individual blocks, so it 2808 // need to create a dummy 'reserve' record to match 2809 // the release. 2810 MemTracker::record_virtual_memory_reserve((address)p_buf, 2811 bytes_to_release, CALLER_PC); 2812 os::release_memory(p_buf, bytes_to_release); 2813 } 2814 #ifdef ASSERT 2815 if (should_inject_error) { 2816 log_develop_debug(pagesize)("Reserving pages individually failed."); 2817 } 2818 #endif 2819 return NULL; 2820 } 2821 2822 bytes_remaining -= bytes_to_rq; 2823 next_alloc_addr += bytes_to_rq; 2824 count++; 2825 } 2826 // Although the memory is allocated individually, it is returned as one. 2827 // NMT records it as one block. 2828 if ((flags & MEM_COMMIT) != 0) { 2829 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC); 2830 } else { 2831 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC); 2832 } 2833 2834 // made it this far, success 2835 return p_buf; 2836 } 2837 2838 2839 2840 void os::large_page_init() { 2841 if (!UseLargePages) return; 2842 2843 // print a warning if any large page related flag is specified on command line 2844 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2845 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2846 bool success = false; 2847 2848 #define WARN(msg) if (warn_on_failure) { warning(msg); } 2849 if (request_lock_memory_privilege()) { 2850 size_t s = GetLargePageMinimum(); 2851 if (s) { 2852 #if defined(IA32) || defined(AMD64) 2853 if (s > 4*M || LargePageSizeInBytes > 4*M) { 2854 WARN("JVM cannot use large pages bigger than 4mb."); 2855 } else { 2856 #endif 2857 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 2858 _large_page_size = LargePageSizeInBytes; 2859 } else { 2860 _large_page_size = s; 2861 } 2862 success = true; 2863 #if defined(IA32) || defined(AMD64) 2864 } 2865 #endif 2866 } else { 2867 WARN("Large page is not supported by the processor."); 2868 } 2869 } else { 2870 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 2871 } 2872 #undef WARN 2873 2874 const size_t default_page_size = (size_t) vm_page_size(); 2875 if (success && _large_page_size > default_page_size) { 2876 _page_sizes[0] = _large_page_size; 2877 _page_sizes[1] = default_page_size; 2878 _page_sizes[2] = 0; 2879 } 2880 2881 cleanup_after_large_page_init(); 2882 UseLargePages = success; 2883 } 2884 2885 // On win32, one cannot release just a part of reserved memory, it's an 2886 // all or nothing deal. When we split a reservation, we must break the 2887 // reservation into two reservations. 2888 void os::pd_split_reserved_memory(char *base, size_t size, size_t split, 2889 bool realloc) { 2890 if (size > 0) { 2891 release_memory(base, size); 2892 if (realloc) { 2893 reserve_memory(split, base); 2894 } 2895 if (size != split) { 2896 reserve_memory(size - split, base + split); 2897 } 2898 } 2899 } 2900 2901 // Multiple threads can race in this code but it's not possible to unmap small sections of 2902 // virtual space to get requested alignment, like posix-like os's. 2903 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe. 2904 char* os::reserve_memory_aligned(size_t size, size_t alignment) { 2905 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 2906 "Alignment must be a multiple of allocation granularity (page size)"); 2907 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 2908 2909 size_t extra_size = size + alignment; 2910 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 2911 2912 char* aligned_base = NULL; 2913 2914 do { 2915 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 2916 if (extra_base == NULL) { 2917 return NULL; 2918 } 2919 // Do manual alignment 2920 aligned_base = align_up(extra_base, alignment); 2921 2922 os::release_memory(extra_base, extra_size); 2923 2924 aligned_base = os::reserve_memory(size, aligned_base); 2925 2926 } while (aligned_base == NULL); 2927 2928 return aligned_base; 2929 } 2930 2931 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 2932 assert((size_t)addr % os::vm_allocation_granularity() == 0, 2933 "reserve alignment"); 2934 assert(bytes % os::vm_page_size() == 0, "reserve page size"); 2935 char* res; 2936 // note that if UseLargePages is on, all the areas that require interleaving 2937 // will go thru reserve_memory_special rather than thru here. 2938 bool use_individual = (UseNUMAInterleaving && !UseLargePages); 2939 if (!use_individual) { 2940 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 2941 } else { 2942 elapsedTimer reserveTimer; 2943 if (Verbose && PrintMiscellaneous) reserveTimer.start(); 2944 // in numa interleaving, we have to allocate pages individually 2945 // (well really chunks of NUMAInterleaveGranularity size) 2946 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE); 2947 if (res == NULL) { 2948 warning("NUMA page allocation failed"); 2949 } 2950 if (Verbose && PrintMiscellaneous) { 2951 reserveTimer.stop(); 2952 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes, 2953 reserveTimer.milliseconds(), reserveTimer.ticks()); 2954 } 2955 } 2956 assert(res == NULL || addr == NULL || addr == res, 2957 "Unexpected address from reserve."); 2958 2959 return res; 2960 } 2961 2962 // Reserve memory at an arbitrary address, only if that area is 2963 // available (and not reserved for something else). 2964 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2965 // Windows os::reserve_memory() fails of the requested address range is 2966 // not avilable. 2967 return reserve_memory(bytes, requested_addr); 2968 } 2969 2970 size_t os::large_page_size() { 2971 return _large_page_size; 2972 } 2973 2974 bool os::can_commit_large_page_memory() { 2975 // Windows only uses large page memory when the entire region is reserved 2976 // and committed in a single VirtualAlloc() call. This may change in the 2977 // future, but with Windows 2003 it's not possible to commit on demand. 2978 return false; 2979 } 2980 2981 bool os::can_execute_large_page_memory() { 2982 return true; 2983 } 2984 2985 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, 2986 bool exec) { 2987 assert(UseLargePages, "only for large pages"); 2988 2989 if (!is_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { 2990 return NULL; // Fallback to small pages. 2991 } 2992 2993 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 2994 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 2995 2996 // with large pages, there are two cases where we need to use Individual Allocation 2997 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003) 2998 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page 2999 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) { 3000 log_debug(pagesize)("Reserving large pages individually."); 3001 3002 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError); 3003 if (p_buf == NULL) { 3004 // give an appropriate warning message 3005 if (UseNUMAInterleaving) { 3006 warning("NUMA large page allocation failed, UseLargePages flag ignored"); 3007 } 3008 if (UseLargePagesIndividualAllocation) { 3009 warning("Individually allocated large pages failed, " 3010 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 3011 } 3012 return NULL; 3013 } 3014 3015 return p_buf; 3016 3017 } else { 3018 log_debug(pagesize)("Reserving large pages in a single large chunk."); 3019 3020 // normal policy just allocate it all at once 3021 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3022 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); 3023 if (res != NULL) { 3024 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC); 3025 } 3026 3027 return res; 3028 } 3029 } 3030 3031 bool os::release_memory_special(char* base, size_t bytes) { 3032 assert(base != NULL, "Sanity check"); 3033 return release_memory(base, bytes); 3034 } 3035 3036 void os::print_statistics() { 3037 } 3038 3039 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) { 3040 int err = os::get_last_error(); 3041 char buf[256]; 3042 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3043 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 3044 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3045 exec, buf_len != 0 ? buf : "<no_error_string>", err); 3046 } 3047 3048 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 3049 if (bytes == 0) { 3050 // Don't bother the OS with noops. 3051 return true; 3052 } 3053 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 3054 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 3055 // Don't attempt to print anything if the OS call fails. We're 3056 // probably low on resources, so the print itself may cause crashes. 3057 3058 // unless we have NUMAInterleaving enabled, the range of a commit 3059 // is always within a reserve covered by a single VirtualAlloc 3060 // in that case we can just do a single commit for the requested size 3061 if (!UseNUMAInterleaving) { 3062 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) { 3063 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3064 return false; 3065 } 3066 if (exec) { 3067 DWORD oldprot; 3068 // Windows doc says to use VirtualProtect to get execute permissions 3069 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) { 3070 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3071 return false; 3072 } 3073 } 3074 return true; 3075 } else { 3076 3077 // when NUMAInterleaving is enabled, the commit might cover a range that 3078 // came from multiple VirtualAlloc reserves (using allocate_pages_individually). 3079 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery 3080 // returns represents the number of bytes that can be committed in one step. 3081 size_t bytes_remaining = bytes; 3082 char * next_alloc_addr = addr; 3083 while (bytes_remaining > 0) { 3084 MEMORY_BASIC_INFORMATION alloc_info; 3085 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info)); 3086 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3087 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, 3088 PAGE_READWRITE) == NULL) { 3089 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3090 exec);) 3091 return false; 3092 } 3093 if (exec) { 3094 DWORD oldprot; 3095 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, 3096 PAGE_EXECUTE_READWRITE, &oldprot)) { 3097 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3098 exec);) 3099 return false; 3100 } 3101 } 3102 bytes_remaining -= bytes_to_rq; 3103 next_alloc_addr += bytes_to_rq; 3104 } 3105 } 3106 // if we made it this far, return true 3107 return true; 3108 } 3109 3110 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 3111 bool exec) { 3112 // alignment_hint is ignored on this OS 3113 return pd_commit_memory(addr, size, exec); 3114 } 3115 3116 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 3117 const char* mesg) { 3118 assert(mesg != NULL, "mesg must be specified"); 3119 if (!pd_commit_memory(addr, size, exec)) { 3120 warn_fail_commit_memory(addr, size, exec); 3121 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 3122 } 3123 } 3124 3125 void os::pd_commit_memory_or_exit(char* addr, size_t size, 3126 size_t alignment_hint, bool exec, 3127 const char* mesg) { 3128 // alignment_hint is ignored on this OS 3129 pd_commit_memory_or_exit(addr, size, exec, mesg); 3130 } 3131 3132 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3133 if (bytes == 0) { 3134 // Don't bother the OS with noops. 3135 return true; 3136 } 3137 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 3138 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 3139 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0); 3140 } 3141 3142 bool os::pd_release_memory(char* addr, size_t bytes) { 3143 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 3144 } 3145 3146 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 3147 return os::commit_memory(addr, size, !ExecMem); 3148 } 3149 3150 bool os::remove_stack_guard_pages(char* addr, size_t size) { 3151 return os::uncommit_memory(addr, size); 3152 } 3153 3154 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) { 3155 uint count = 0; 3156 bool ret = false; 3157 size_t bytes_remaining = bytes; 3158 char * next_protect_addr = addr; 3159 3160 // Use VirtualQuery() to get the chunk size. 3161 while (bytes_remaining) { 3162 MEMORY_BASIC_INFORMATION alloc_info; 3163 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) { 3164 return false; 3165 } 3166 3167 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3168 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving, 3169 // but we don't distinguish here as both cases are protected by same API. 3170 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0; 3171 warning("Failed protecting pages individually for chunk #%u", count); 3172 if (!ret) { 3173 return false; 3174 } 3175 3176 bytes_remaining -= bytes_to_protect; 3177 next_protect_addr += bytes_to_protect; 3178 count++; 3179 } 3180 return ret; 3181 } 3182 3183 // Set protections specified 3184 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3185 bool is_committed) { 3186 unsigned int p = 0; 3187 switch (prot) { 3188 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 3189 case MEM_PROT_READ: p = PAGE_READONLY; break; 3190 case MEM_PROT_RW: p = PAGE_READWRITE; break; 3191 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 3192 default: 3193 ShouldNotReachHere(); 3194 } 3195 3196 DWORD old_status; 3197 3198 // Strange enough, but on Win32 one can change protection only for committed 3199 // memory, not a big deal anyway, as bytes less or equal than 64K 3200 if (!is_committed) { 3201 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX, 3202 "cannot commit protection page"); 3203 } 3204 // One cannot use os::guard_memory() here, as on Win32 guard page 3205 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 3206 // 3207 // Pages in the region become guard pages. Any attempt to access a guard page 3208 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 3209 // the guard page status. Guard pages thus act as a one-time access alarm. 3210 bool ret; 3211 if (UseNUMAInterleaving) { 3212 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time, 3213 // so we must protect the chunks individually. 3214 ret = protect_pages_individually(addr, bytes, p, &old_status); 3215 } else { 3216 ret = VirtualProtect(addr, bytes, p, &old_status) != 0; 3217 } 3218 #ifdef ASSERT 3219 if (!ret) { 3220 int err = os::get_last_error(); 3221 char buf[256]; 3222 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3223 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT 3224 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3225 buf_len != 0 ? buf : "<no_error_string>", err); 3226 } 3227 #endif 3228 return ret; 3229 } 3230 3231 bool os::guard_memory(char* addr, size_t bytes) { 3232 DWORD old_status; 3233 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 3234 } 3235 3236 bool os::unguard_memory(char* addr, size_t bytes) { 3237 DWORD old_status; 3238 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 3239 } 3240 3241 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3242 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3243 void os::numa_make_global(char *addr, size_t bytes) { } 3244 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 3245 bool os::numa_topology_changed() { return false; } 3246 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); } 3247 int os::numa_get_group_id() { return 0; } 3248 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 3249 if (numa_node_list_holder.get_count() == 0 && size > 0) { 3250 // Provide an answer for UMA systems 3251 ids[0] = 0; 3252 return 1; 3253 } else { 3254 // check for size bigger than actual groups_num 3255 size = MIN2(size, numa_get_groups_num()); 3256 for (int i = 0; i < (int)size; i++) { 3257 ids[i] = numa_node_list_holder.get_node_list_entry(i); 3258 } 3259 return size; 3260 } 3261 } 3262 3263 bool os::get_page_info(char *start, page_info* info) { 3264 return false; 3265 } 3266 3267 char *os::scan_pages(char *start, char* end, page_info* page_expected, 3268 page_info* page_found) { 3269 return end; 3270 } 3271 3272 char* os::non_memory_address_word() { 3273 // Must never look like an address returned by reserve_memory, 3274 // even in its subfields (as defined by the CPU immediate fields, 3275 // if the CPU splits constants across multiple instructions). 3276 return (char*)-1; 3277 } 3278 3279 #define MAX_ERROR_COUNT 100 3280 #define SYS_THREAD_ERROR 0xffffffffUL 3281 3282 void os::pd_start_thread(Thread* thread) { 3283 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 3284 // Returns previous suspend state: 3285 // 0: Thread was not suspended 3286 // 1: Thread is running now 3287 // >1: Thread is still suspended. 3288 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3289 } 3290 3291 class HighResolutionInterval : public CHeapObj<mtThread> { 3292 // The default timer resolution seems to be 10 milliseconds. 3293 // (Where is this written down?) 3294 // If someone wants to sleep for only a fraction of the default, 3295 // then we set the timer resolution down to 1 millisecond for 3296 // the duration of their interval. 3297 // We carefully set the resolution back, since otherwise we 3298 // seem to incur an overhead (3%?) that we don't need. 3299 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 3300 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 3301 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 3302 // timeBeginPeriod() if the relative error exceeded some threshold. 3303 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 3304 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 3305 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 3306 // resolution timers running. 3307 private: 3308 jlong resolution; 3309 public: 3310 HighResolutionInterval(jlong ms) { 3311 resolution = ms % 10L; 3312 if (resolution != 0) { 3313 MMRESULT result = timeBeginPeriod(1L); 3314 } 3315 } 3316 ~HighResolutionInterval() { 3317 if (resolution != 0) { 3318 MMRESULT result = timeEndPeriod(1L); 3319 } 3320 resolution = 0L; 3321 } 3322 }; 3323 3324 int os::sleep(Thread* thread, jlong ms, bool interruptable) { 3325 jlong limit = (jlong) MAXDWORD; 3326 3327 while (ms > limit) { 3328 int res; 3329 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) { 3330 return res; 3331 } 3332 ms -= limit; 3333 } 3334 3335 assert(thread == Thread::current(), "thread consistency check"); 3336 OSThread* osthread = thread->osthread(); 3337 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 3338 int result; 3339 if (interruptable) { 3340 assert(thread->is_Java_thread(), "must be java thread"); 3341 JavaThread *jt = (JavaThread *) thread; 3342 ThreadBlockInVM tbivm(jt); 3343 3344 jt->set_suspend_equivalent(); 3345 // cleared by handle_special_suspend_equivalent_condition() or 3346 // java_suspend_self() via check_and_wait_while_suspended() 3347 3348 HANDLE events[1]; 3349 events[0] = osthread->interrupt_event(); 3350 HighResolutionInterval *phri=NULL; 3351 if (!ForceTimeHighResolution) { 3352 phri = new HighResolutionInterval(ms); 3353 } 3354 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 3355 result = OS_TIMEOUT; 3356 } else { 3357 ResetEvent(osthread->interrupt_event()); 3358 osthread->set_interrupted(false); 3359 result = OS_INTRPT; 3360 } 3361 delete phri; //if it is NULL, harmless 3362 3363 // were we externally suspended while we were waiting? 3364 jt->check_and_wait_while_suspended(); 3365 } else { 3366 assert(!thread->is_Java_thread(), "must not be java thread"); 3367 Sleep((long) ms); 3368 result = OS_TIMEOUT; 3369 } 3370 return result; 3371 } 3372 3373 // Short sleep, direct OS call. 3374 // 3375 // ms = 0, means allow others (if any) to run. 3376 // 3377 void os::naked_short_sleep(jlong ms) { 3378 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3379 Sleep(ms); 3380 } 3381 3382 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3383 void os::infinite_sleep() { 3384 while (true) { // sleep forever ... 3385 Sleep(100000); // ... 100 seconds at a time 3386 } 3387 } 3388 3389 typedef BOOL (WINAPI * STTSignature)(void); 3390 3391 void os::naked_yield() { 3392 // Consider passing back the return value from SwitchToThread(). 3393 SwitchToThread(); 3394 } 3395 3396 // Win32 only gives you access to seven real priorities at a time, 3397 // so we compress Java's ten down to seven. It would be better 3398 // if we dynamically adjusted relative priorities. 3399 3400 int os::java_to_os_priority[CriticalPriority + 1] = { 3401 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3402 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3403 THREAD_PRIORITY_LOWEST, // 2 3404 THREAD_PRIORITY_BELOW_NORMAL, // 3 3405 THREAD_PRIORITY_BELOW_NORMAL, // 4 3406 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3407 THREAD_PRIORITY_NORMAL, // 6 3408 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3409 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3410 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3411 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority 3412 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority 3413 }; 3414 3415 int prio_policy1[CriticalPriority + 1] = { 3416 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3417 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3418 THREAD_PRIORITY_LOWEST, // 2 3419 THREAD_PRIORITY_BELOW_NORMAL, // 3 3420 THREAD_PRIORITY_BELOW_NORMAL, // 4 3421 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3422 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3423 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3424 THREAD_PRIORITY_HIGHEST, // 8 3425 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3426 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority 3427 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority 3428 }; 3429 3430 static int prio_init() { 3431 // If ThreadPriorityPolicy is 1, switch tables 3432 if (ThreadPriorityPolicy == 1) { 3433 int i; 3434 for (i = 0; i < CriticalPriority + 1; i++) { 3435 os::java_to_os_priority[i] = prio_policy1[i]; 3436 } 3437 } 3438 if (UseCriticalJavaThreadPriority) { 3439 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 3440 } 3441 return 0; 3442 } 3443 3444 OSReturn os::set_native_priority(Thread* thread, int priority) { 3445 if (!UseThreadPriorities) return OS_OK; 3446 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3447 return ret ? OS_OK : OS_ERR; 3448 } 3449 3450 OSReturn os::get_native_priority(const Thread* const thread, 3451 int* priority_ptr) { 3452 if (!UseThreadPriorities) { 3453 *priority_ptr = java_to_os_priority[NormPriority]; 3454 return OS_OK; 3455 } 3456 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3457 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3458 assert(false, "GetThreadPriority failed"); 3459 return OS_ERR; 3460 } 3461 *priority_ptr = os_prio; 3462 return OS_OK; 3463 } 3464 3465 3466 // Hint to the underlying OS that a task switch would not be good. 3467 // Void return because it's a hint and can fail. 3468 void os::hint_no_preempt() {} 3469 3470 void os::interrupt(Thread* thread) { 3471 assert(!thread->is_Java_thread() || Thread::current() == thread || 3472 Threads_lock->owned_by_self(), 3473 "possibility of dangling Thread pointer"); 3474 3475 OSThread* osthread = thread->osthread(); 3476 osthread->set_interrupted(true); 3477 // More than one thread can get here with the same value of osthread, 3478 // resulting in multiple notifications. We do, however, want the store 3479 // to interrupted() to be visible to other threads before we post 3480 // the interrupt event. 3481 OrderAccess::release(); 3482 SetEvent(osthread->interrupt_event()); 3483 // For JSR166: unpark after setting status 3484 if (thread->is_Java_thread()) { 3485 ((JavaThread*)thread)->parker()->unpark(); 3486 } 3487 3488 ParkEvent * ev = thread->_ParkEvent; 3489 if (ev != NULL) ev->unpark(); 3490 } 3491 3492 3493 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3494 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3495 "possibility of dangling Thread pointer"); 3496 3497 OSThread* osthread = thread->osthread(); 3498 // There is no synchronization between the setting of the interrupt 3499 // and it being cleared here. It is critical - see 6535709 - that 3500 // we only clear the interrupt state, and reset the interrupt event, 3501 // if we are going to report that we were indeed interrupted - else 3502 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups 3503 // depending on the timing. By checking thread interrupt event to see 3504 // if the thread gets real interrupt thus prevent spurious wakeup. 3505 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0); 3506 if (interrupted && clear_interrupted) { 3507 osthread->set_interrupted(false); 3508 ResetEvent(osthread->interrupt_event()); 3509 } // Otherwise leave the interrupted state alone 3510 3511 return interrupted; 3512 } 3513 3514 // GetCurrentThreadId() returns DWORD 3515 intx os::current_thread_id() { return GetCurrentThreadId(); } 3516 3517 static int _initial_pid = 0; 3518 3519 int os::current_process_id() { 3520 return (_initial_pid ? _initial_pid : _getpid()); 3521 } 3522 3523 int os::win32::_vm_page_size = 0; 3524 int os::win32::_vm_allocation_granularity = 0; 3525 int os::win32::_processor_type = 0; 3526 // Processor level is not available on non-NT systems, use vm_version instead 3527 int os::win32::_processor_level = 0; 3528 julong os::win32::_physical_memory = 0; 3529 size_t os::win32::_default_stack_size = 0; 3530 3531 intx os::win32::_os_thread_limit = 0; 3532 volatile intx os::win32::_os_thread_count = 0; 3533 3534 bool os::win32::_is_windows_server = false; 3535 3536 // 6573254 3537 // Currently, the bug is observed across all the supported Windows releases, 3538 // including the latest one (as of this writing - Windows Server 2012 R2) 3539 bool os::win32::_has_exit_bug = true; 3540 3541 void os::win32::initialize_system_info() { 3542 SYSTEM_INFO si; 3543 GetSystemInfo(&si); 3544 _vm_page_size = si.dwPageSize; 3545 _vm_allocation_granularity = si.dwAllocationGranularity; 3546 _processor_type = si.dwProcessorType; 3547 _processor_level = si.wProcessorLevel; 3548 set_processor_count(si.dwNumberOfProcessors); 3549 3550 MEMORYSTATUSEX ms; 3551 ms.dwLength = sizeof(ms); 3552 3553 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3554 // dwMemoryLoad (% of memory in use) 3555 GlobalMemoryStatusEx(&ms); 3556 _physical_memory = ms.ullTotalPhys; 3557 3558 if (FLAG_IS_DEFAULT(MaxRAM)) { 3559 // Adjust MaxRAM according to the maximum virtual address space available. 3560 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual)); 3561 } 3562 3563 OSVERSIONINFOEX oi; 3564 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 3565 GetVersionEx((OSVERSIONINFO*)&oi); 3566 switch (oi.dwPlatformId) { 3567 case VER_PLATFORM_WIN32_NT: 3568 { 3569 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3570 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER || 3571 oi.wProductType == VER_NT_SERVER) { 3572 _is_windows_server = true; 3573 } 3574 } 3575 break; 3576 default: fatal("Unknown platform"); 3577 } 3578 3579 _default_stack_size = os::current_stack_size(); 3580 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3581 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3582 "stack size not a multiple of page size"); 3583 3584 initialize_performance_counter(); 3585 } 3586 3587 3588 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, 3589 int ebuflen) { 3590 char path[MAX_PATH]; 3591 DWORD size; 3592 DWORD pathLen = (DWORD)sizeof(path); 3593 HINSTANCE result = NULL; 3594 3595 // only allow library name without path component 3596 assert(strchr(name, '\\') == NULL, "path not allowed"); 3597 assert(strchr(name, ':') == NULL, "path not allowed"); 3598 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) { 3599 jio_snprintf(ebuf, ebuflen, 3600 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name); 3601 return NULL; 3602 } 3603 3604 // search system directory 3605 if ((size = GetSystemDirectory(path, pathLen)) > 0) { 3606 if (size >= pathLen) { 3607 return NULL; // truncated 3608 } 3609 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3610 return NULL; // truncated 3611 } 3612 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3613 return result; 3614 } 3615 } 3616 3617 // try Windows directory 3618 if ((size = GetWindowsDirectory(path, pathLen)) > 0) { 3619 if (size >= pathLen) { 3620 return NULL; // truncated 3621 } 3622 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3623 return NULL; // truncated 3624 } 3625 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3626 return result; 3627 } 3628 } 3629 3630 jio_snprintf(ebuf, ebuflen, 3631 "os::win32::load_windows_dll() cannot load %s from system directories.", name); 3632 return NULL; 3633 } 3634 3635 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS) 3636 #define EXIT_TIMEOUT 300000 /* 5 minutes */ 3637 3638 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) { 3639 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect); 3640 return TRUE; 3641 } 3642 3643 int os::win32::exit_process_or_thread(Ept what, int exit_code) { 3644 // Basic approach: 3645 // - Each exiting thread registers its intent to exit and then does so. 3646 // - A thread trying to terminate the process must wait for all 3647 // threads currently exiting to complete their exit. 3648 3649 if (os::win32::has_exit_bug()) { 3650 // The array holds handles of the threads that have started exiting by calling 3651 // _endthreadex(). 3652 // Should be large enough to avoid blocking the exiting thread due to lack of 3653 // a free slot. 3654 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP]; 3655 static int handle_count = 0; 3656 3657 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT; 3658 static CRITICAL_SECTION crit_sect; 3659 static volatile DWORD process_exiting = 0; 3660 int i, j; 3661 DWORD res; 3662 HANDLE hproc, hthr; 3663 3664 // We only attempt to register threads until a process exiting 3665 // thread manages to set the process_exiting flag. Any threads 3666 // that come through here after the process_exiting flag is set 3667 // are unregistered and will be caught in the SuspendThread() 3668 // infinite loop below. 3669 bool registered = false; 3670 3671 // The first thread that reached this point, initializes the critical section. 3672 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) { 3673 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__); 3674 } else if (OrderAccess::load_acquire(&process_exiting) == 0) { 3675 if (what != EPT_THREAD) { 3676 // Atomically set process_exiting before the critical section 3677 // to increase the visibility between racing threads. 3678 Atomic::cmpxchg(GetCurrentThreadId(), &process_exiting, (DWORD)0); 3679 } 3680 EnterCriticalSection(&crit_sect); 3681 3682 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) { 3683 // Remove from the array those handles of the threads that have completed exiting. 3684 for (i = 0, j = 0; i < handle_count; ++i) { 3685 res = WaitForSingleObject(handles[i], 0 /* don't wait */); 3686 if (res == WAIT_TIMEOUT) { 3687 handles[j++] = handles[i]; 3688 } else { 3689 if (res == WAIT_FAILED) { 3690 warning("WaitForSingleObject failed (%u) in %s: %d\n", 3691 GetLastError(), __FILE__, __LINE__); 3692 } 3693 // Don't keep the handle, if we failed waiting for it. 3694 CloseHandle(handles[i]); 3695 } 3696 } 3697 3698 // If there's no free slot in the array of the kept handles, we'll have to 3699 // wait until at least one thread completes exiting. 3700 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) { 3701 // Raise the priority of the oldest exiting thread to increase its chances 3702 // to complete sooner. 3703 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL); 3704 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT); 3705 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) { 3706 i = (res - WAIT_OBJECT_0); 3707 handle_count = MAXIMUM_THREADS_TO_KEEP - 1; 3708 for (; i < handle_count; ++i) { 3709 handles[i] = handles[i + 1]; 3710 } 3711 } else { 3712 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3713 (res == WAIT_FAILED ? "failed" : "timed out"), 3714 GetLastError(), __FILE__, __LINE__); 3715 // Don't keep handles, if we failed waiting for them. 3716 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) { 3717 CloseHandle(handles[i]); 3718 } 3719 handle_count = 0; 3720 } 3721 } 3722 3723 // Store a duplicate of the current thread handle in the array of handles. 3724 hproc = GetCurrentProcess(); 3725 hthr = GetCurrentThread(); 3726 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count], 3727 0, FALSE, DUPLICATE_SAME_ACCESS)) { 3728 warning("DuplicateHandle failed (%u) in %s: %d\n", 3729 GetLastError(), __FILE__, __LINE__); 3730 3731 // We can't register this thread (no more handles) so this thread 3732 // may be racing with a thread that is calling exit(). If the thread 3733 // that is calling exit() has managed to set the process_exiting 3734 // flag, then this thread will be caught in the SuspendThread() 3735 // infinite loop below which closes that race. A small timing 3736 // window remains before the process_exiting flag is set, but it 3737 // is only exposed when we are out of handles. 3738 } else { 3739 ++handle_count; 3740 registered = true; 3741 3742 // The current exiting thread has stored its handle in the array, and now 3743 // should leave the critical section before calling _endthreadex(). 3744 } 3745 3746 } else if (what != EPT_THREAD && handle_count > 0) { 3747 jlong start_time, finish_time, timeout_left; 3748 // Before ending the process, make sure all the threads that had called 3749 // _endthreadex() completed. 3750 3751 // Set the priority level of the current thread to the same value as 3752 // the priority level of exiting threads. 3753 // This is to ensure it will be given a fair chance to execute if 3754 // the timeout expires. 3755 hthr = GetCurrentThread(); 3756 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL); 3757 start_time = os::javaTimeNanos(); 3758 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L); 3759 for (i = 0; ; ) { 3760 int portion_count = handle_count - i; 3761 if (portion_count > MAXIMUM_WAIT_OBJECTS) { 3762 portion_count = MAXIMUM_WAIT_OBJECTS; 3763 } 3764 for (j = 0; j < portion_count; ++j) { 3765 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL); 3766 } 3767 timeout_left = (finish_time - start_time) / 1000000L; 3768 if (timeout_left < 0) { 3769 timeout_left = 0; 3770 } 3771 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left); 3772 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) { 3773 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3774 (res == WAIT_FAILED ? "failed" : "timed out"), 3775 GetLastError(), __FILE__, __LINE__); 3776 // Reset portion_count so we close the remaining 3777 // handles due to this error. 3778 portion_count = handle_count - i; 3779 } 3780 for (j = 0; j < portion_count; ++j) { 3781 CloseHandle(handles[i + j]); 3782 } 3783 if ((i += portion_count) >= handle_count) { 3784 break; 3785 } 3786 start_time = os::javaTimeNanos(); 3787 } 3788 handle_count = 0; 3789 } 3790 3791 LeaveCriticalSection(&crit_sect); 3792 } 3793 3794 if (!registered && 3795 OrderAccess::load_acquire(&process_exiting) != 0 && 3796 process_exiting != GetCurrentThreadId()) { 3797 // Some other thread is about to call exit(), so we don't let 3798 // the current unregistered thread proceed to exit() or _endthreadex() 3799 while (true) { 3800 SuspendThread(GetCurrentThread()); 3801 // Avoid busy-wait loop, if SuspendThread() failed. 3802 Sleep(EXIT_TIMEOUT); 3803 } 3804 } 3805 } 3806 3807 // We are here if either 3808 // - there's no 'race at exit' bug on this OS release; 3809 // - initialization of the critical section failed (unlikely); 3810 // - the current thread has registered itself and left the critical section; 3811 // - the process-exiting thread has raised the flag and left the critical section. 3812 if (what == EPT_THREAD) { 3813 _endthreadex((unsigned)exit_code); 3814 } else if (what == EPT_PROCESS) { 3815 ::exit(exit_code); 3816 } else { 3817 _exit(exit_code); 3818 } 3819 3820 // Should not reach here 3821 return exit_code; 3822 } 3823 3824 #undef EXIT_TIMEOUT 3825 3826 void os::win32::setmode_streams() { 3827 _setmode(_fileno(stdin), _O_BINARY); 3828 _setmode(_fileno(stdout), _O_BINARY); 3829 _setmode(_fileno(stderr), _O_BINARY); 3830 } 3831 3832 3833 bool os::is_debugger_attached() { 3834 return IsDebuggerPresent() ? true : false; 3835 } 3836 3837 3838 void os::wait_for_keypress_at_exit(void) { 3839 if (PauseAtExit) { 3840 fprintf(stderr, "Press any key to continue...\n"); 3841 fgetc(stdin); 3842 } 3843 } 3844 3845 3846 bool os::message_box(const char* title, const char* message) { 3847 int result = MessageBox(NULL, message, title, 3848 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 3849 return result == IDYES; 3850 } 3851 3852 #ifndef PRODUCT 3853 #ifndef _WIN64 3854 // Helpers to check whether NX protection is enabled 3855 int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 3856 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 3857 pex->ExceptionRecord->NumberParameters > 0 && 3858 pex->ExceptionRecord->ExceptionInformation[0] == 3859 EXCEPTION_INFO_EXEC_VIOLATION) { 3860 return EXCEPTION_EXECUTE_HANDLER; 3861 } 3862 return EXCEPTION_CONTINUE_SEARCH; 3863 } 3864 3865 void nx_check_protection() { 3866 // If NX is enabled we'll get an exception calling into code on the stack 3867 char code[] = { (char)0xC3 }; // ret 3868 void *code_ptr = (void *)code; 3869 __try { 3870 __asm call code_ptr 3871 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 3872 tty->print_raw_cr("NX protection detected."); 3873 } 3874 } 3875 #endif // _WIN64 3876 #endif // PRODUCT 3877 3878 // This is called _before_ the global arguments have been parsed 3879 void os::init(void) { 3880 _initial_pid = _getpid(); 3881 3882 init_random(1234567); 3883 3884 win32::initialize_system_info(); 3885 win32::setmode_streams(); 3886 init_page_sizes((size_t) win32::vm_page_size()); 3887 3888 // This may be overridden later when argument processing is done. 3889 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, false); 3890 3891 // Initialize main_process and main_thread 3892 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 3893 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 3894 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 3895 fatal("DuplicateHandle failed\n"); 3896 } 3897 main_thread_id = (int) GetCurrentThreadId(); 3898 3899 // initialize fast thread access - only used for 32-bit 3900 win32::initialize_thread_ptr_offset(); 3901 } 3902 3903 // To install functions for atexit processing 3904 extern "C" { 3905 static void perfMemory_exit_helper() { 3906 perfMemory_exit(); 3907 } 3908 } 3909 3910 static jint initSock(); 3911 3912 // this is called _after_ the global arguments have been parsed 3913 jint os::init_2(void) { 3914 // Setup Windows Exceptions 3915 3916 // for debugging float code generation bugs 3917 if (ForceFloatExceptions) { 3918 #ifndef _WIN64 3919 static long fp_control_word = 0; 3920 __asm { fstcw fp_control_word } 3921 // see Intel PPro Manual, Vol. 2, p 7-16 3922 const long precision = 0x20; 3923 const long underflow = 0x10; 3924 const long overflow = 0x08; 3925 const long zero_div = 0x04; 3926 const long denorm = 0x02; 3927 const long invalid = 0x01; 3928 fp_control_word |= invalid; 3929 __asm { fldcw fp_control_word } 3930 #endif 3931 } 3932 3933 // If stack_commit_size is 0, windows will reserve the default size, 3934 // but only commit a small portion of it. 3935 size_t stack_commit_size = align_up(ThreadStackSize*K, os::vm_page_size()); 3936 size_t default_reserve_size = os::win32::default_stack_size(); 3937 size_t actual_reserve_size = stack_commit_size; 3938 if (stack_commit_size < default_reserve_size) { 3939 // If stack_commit_size == 0, we want this too 3940 actual_reserve_size = default_reserve_size; 3941 } 3942 3943 // Check minimum allowable stack size for thread creation and to initialize 3944 // the java system classes, including StackOverflowError - depends on page 3945 // size. Add two 4K pages for compiler2 recursion in main thread. 3946 // Add in 4*BytesPerWord 4K pages to account for VM stack during 3947 // class initialization depending on 32 or 64 bit VM. 3948 size_t min_stack_allowed = 3949 (size_t)(JavaThread::stack_guard_zone_size() + 3950 JavaThread::stack_shadow_zone_size() + 3951 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K); 3952 3953 min_stack_allowed = align_up(min_stack_allowed, os::vm_page_size()); 3954 3955 if (actual_reserve_size < min_stack_allowed) { 3956 tty->print_cr("\nThe Java thread stack size specified is too small. " 3957 "Specify at least %dk", 3958 min_stack_allowed / K); 3959 return JNI_ERR; 3960 } 3961 3962 JavaThread::set_stack_size_at_create(stack_commit_size); 3963 3964 // Calculate theoretical max. size of Threads to guard gainst artifical 3965 // out-of-memory situations, where all available address-space has been 3966 // reserved by thread stacks. 3967 assert(actual_reserve_size != 0, "Must have a stack"); 3968 3969 // Calculate the thread limit when we should start doing Virtual Memory 3970 // banging. Currently when the threads will have used all but 200Mb of space. 3971 // 3972 // TODO: consider performing a similar calculation for commit size instead 3973 // as reserve size, since on a 64-bit platform we'll run into that more 3974 // often than running out of virtual memory space. We can use the 3975 // lower value of the two calculations as the os_thread_limit. 3976 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 3977 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 3978 3979 // at exit methods are called in the reverse order of their registration. 3980 // there is no limit to the number of functions registered. atexit does 3981 // not set errno. 3982 3983 if (PerfAllowAtExitRegistration) { 3984 // only register atexit functions if PerfAllowAtExitRegistration is set. 3985 // atexit functions can be delayed until process exit time, which 3986 // can be problematic for embedded VM situations. Embedded VMs should 3987 // call DestroyJavaVM() to assure that VM resources are released. 3988 3989 // note: perfMemory_exit_helper atexit function may be removed in 3990 // the future if the appropriate cleanup code can be added to the 3991 // VM_Exit VMOperation's doit method. 3992 if (atexit(perfMemory_exit_helper) != 0) { 3993 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3994 } 3995 } 3996 3997 #ifndef _WIN64 3998 // Print something if NX is enabled (win32 on AMD64) 3999 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 4000 #endif 4001 4002 // initialize thread priority policy 4003 prio_init(); 4004 4005 if (UseNUMA && !ForceNUMA) { 4006 UseNUMA = false; // We don't fully support this yet 4007 } 4008 4009 if (UseNUMAInterleaving) { 4010 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag 4011 bool success = numa_interleaving_init(); 4012 if (!success) UseNUMAInterleaving = false; 4013 } 4014 4015 if (initSock() != JNI_OK) { 4016 return JNI_ERR; 4017 } 4018 4019 SymbolEngine::recalc_search_path(); 4020 4021 return JNI_OK; 4022 } 4023 4024 // Mark the polling page as unreadable 4025 void os::make_polling_page_unreadable(void) { 4026 DWORD old_status; 4027 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4028 PAGE_NOACCESS, &old_status)) { 4029 fatal("Could not disable polling page"); 4030 } 4031 } 4032 4033 // Mark the polling page as readable 4034 void os::make_polling_page_readable(void) { 4035 DWORD old_status; 4036 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4037 PAGE_READONLY, &old_status)) { 4038 fatal("Could not enable polling page"); 4039 } 4040 } 4041 4042 4043 int os::stat(const char *path, struct stat *sbuf) { 4044 char pathbuf[MAX_PATH]; 4045 if (strlen(path) > MAX_PATH - 1) { 4046 errno = ENAMETOOLONG; 4047 return -1; 4048 } 4049 os::native_path(strcpy(pathbuf, path)); 4050 int ret = ::stat(pathbuf, sbuf); 4051 if (sbuf != NULL && UseUTCFileTimestamp) { 4052 // Fix for 6539723. st_mtime returned from stat() is dependent on 4053 // the system timezone and so can return different values for the 4054 // same file if/when daylight savings time changes. This adjustment 4055 // makes sure the same timestamp is returned regardless of the TZ. 4056 // 4057 // See: 4058 // http://msdn.microsoft.com/library/ 4059 // default.asp?url=/library/en-us/sysinfo/base/ 4060 // time_zone_information_str.asp 4061 // and 4062 // http://msdn.microsoft.com/library/default.asp?url= 4063 // /library/en-us/sysinfo/base/settimezoneinformation.asp 4064 // 4065 // NOTE: there is a insidious bug here: If the timezone is changed 4066 // after the call to stat() but before 'GetTimeZoneInformation()', then 4067 // the adjustment we do here will be wrong and we'll return the wrong 4068 // value (which will likely end up creating an invalid class data 4069 // archive). Absent a better API for this, or some time zone locking 4070 // mechanism, we'll have to live with this risk. 4071 TIME_ZONE_INFORMATION tz; 4072 DWORD tzid = GetTimeZoneInformation(&tz); 4073 int daylightBias = 4074 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 4075 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 4076 } 4077 return ret; 4078 } 4079 4080 4081 #define FT2INT64(ft) \ 4082 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 4083 4084 4085 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4086 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4087 // of a thread. 4088 // 4089 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4090 // the fast estimate available on the platform. 4091 4092 // current_thread_cpu_time() is not optimized for Windows yet 4093 jlong os::current_thread_cpu_time() { 4094 // return user + sys since the cost is the same 4095 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 4096 } 4097 4098 jlong os::thread_cpu_time(Thread* thread) { 4099 // consistent with what current_thread_cpu_time() returns. 4100 return os::thread_cpu_time(thread, true /* user+sys */); 4101 } 4102 4103 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4104 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4105 } 4106 4107 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 4108 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 4109 // If this function changes, os::is_thread_cpu_time_supported() should too 4110 FILETIME CreationTime; 4111 FILETIME ExitTime; 4112 FILETIME KernelTime; 4113 FILETIME UserTime; 4114 4115 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime, 4116 &ExitTime, &KernelTime, &UserTime) == 0) { 4117 return -1; 4118 } else if (user_sys_cpu_time) { 4119 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 4120 } else { 4121 return FT2INT64(UserTime) * 100; 4122 } 4123 } 4124 4125 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4126 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4127 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4128 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4129 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4130 } 4131 4132 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4133 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4134 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4135 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4136 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4137 } 4138 4139 bool os::is_thread_cpu_time_supported() { 4140 // see os::thread_cpu_time 4141 FILETIME CreationTime; 4142 FILETIME ExitTime; 4143 FILETIME KernelTime; 4144 FILETIME UserTime; 4145 4146 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime, 4147 &KernelTime, &UserTime) == 0) { 4148 return false; 4149 } else { 4150 return true; 4151 } 4152 } 4153 4154 // Windows does't provide a loadavg primitive so this is stubbed out for now. 4155 // It does have primitives (PDH API) to get CPU usage and run queue length. 4156 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 4157 // If we wanted to implement loadavg on Windows, we have a few options: 4158 // 4159 // a) Query CPU usage and run queue length and "fake" an answer by 4160 // returning the CPU usage if it's under 100%, and the run queue 4161 // length otherwise. It turns out that querying is pretty slow 4162 // on Windows, on the order of 200 microseconds on a fast machine. 4163 // Note that on the Windows the CPU usage value is the % usage 4164 // since the last time the API was called (and the first call 4165 // returns 100%), so we'd have to deal with that as well. 4166 // 4167 // b) Sample the "fake" answer using a sampling thread and store 4168 // the answer in a global variable. The call to loadavg would 4169 // just return the value of the global, avoiding the slow query. 4170 // 4171 // c) Sample a better answer using exponential decay to smooth the 4172 // value. This is basically the algorithm used by UNIX kernels. 4173 // 4174 // Note that sampling thread starvation could affect both (b) and (c). 4175 int os::loadavg(double loadavg[], int nelem) { 4176 return -1; 4177 } 4178 4179 4180 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 4181 bool os::dont_yield() { 4182 return DontYieldALot; 4183 } 4184 4185 // This method is a slightly reworked copy of JDK's sysOpen 4186 // from src/windows/hpi/src/sys_api_md.c 4187 4188 int os::open(const char *path, int oflag, int mode) { 4189 char pathbuf[MAX_PATH]; 4190 4191 if (strlen(path) > MAX_PATH - 1) { 4192 errno = ENAMETOOLONG; 4193 return -1; 4194 } 4195 os::native_path(strcpy(pathbuf, path)); 4196 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 4197 } 4198 4199 FILE* os::open(int fd, const char* mode) { 4200 return ::_fdopen(fd, mode); 4201 } 4202 4203 // Is a (classpath) directory empty? 4204 bool os::dir_is_empty(const char* path) { 4205 WIN32_FIND_DATA fd; 4206 HANDLE f = FindFirstFile(path, &fd); 4207 if (f == INVALID_HANDLE_VALUE) { 4208 return true; 4209 } 4210 FindClose(f); 4211 return false; 4212 } 4213 4214 // create binary file, rewriting existing file if required 4215 int os::create_binary_file(const char* path, bool rewrite_existing) { 4216 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 4217 if (!rewrite_existing) { 4218 oflags |= _O_EXCL; 4219 } 4220 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 4221 } 4222 4223 // return current position of file pointer 4224 jlong os::current_file_offset(int fd) { 4225 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 4226 } 4227 4228 // move file pointer to the specified offset 4229 jlong os::seek_to_file_offset(int fd, jlong offset) { 4230 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 4231 } 4232 4233 4234 jlong os::lseek(int fd, jlong offset, int whence) { 4235 return (jlong) ::_lseeki64(fd, offset, whence); 4236 } 4237 4238 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 4239 OVERLAPPED ov; 4240 DWORD nread; 4241 BOOL result; 4242 4243 ZeroMemory(&ov, sizeof(ov)); 4244 ov.Offset = (DWORD)offset; 4245 ov.OffsetHigh = (DWORD)(offset >> 32); 4246 4247 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4248 4249 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov); 4250 4251 return result ? nread : 0; 4252 } 4253 4254 4255 // This method is a slightly reworked copy of JDK's sysNativePath 4256 // from src/windows/hpi/src/path_md.c 4257 4258 // Convert a pathname to native format. On win32, this involves forcing all 4259 // separators to be '\\' rather than '/' (both are legal inputs, but Win95 4260 // sometimes rejects '/') and removing redundant separators. The input path is 4261 // assumed to have been converted into the character encoding used by the local 4262 // system. Because this might be a double-byte encoding, care is taken to 4263 // treat double-byte lead characters correctly. 4264 // 4265 // This procedure modifies the given path in place, as the result is never 4266 // longer than the original. There is no error return; this operation always 4267 // succeeds. 4268 char * os::native_path(char *path) { 4269 char *src = path, *dst = path, *end = path; 4270 char *colon = NULL; // If a drive specifier is found, this will 4271 // point to the colon following the drive letter 4272 4273 // Assumption: '/', '\\', ':', and drive letters are never lead bytes 4274 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\')) 4275 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte"); 4276 4277 // Check for leading separators 4278 #define isfilesep(c) ((c) == '/' || (c) == '\\') 4279 while (isfilesep(*src)) { 4280 src++; 4281 } 4282 4283 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 4284 // Remove leading separators if followed by drive specifier. This 4285 // hack is necessary to support file URLs containing drive 4286 // specifiers (e.g., "file://c:/path"). As a side effect, 4287 // "/c:/path" can be used as an alternative to "c:/path". 4288 *dst++ = *src++; 4289 colon = dst; 4290 *dst++ = ':'; 4291 src++; 4292 } else { 4293 src = path; 4294 if (isfilesep(src[0]) && isfilesep(src[1])) { 4295 // UNC pathname: Retain first separator; leave src pointed at 4296 // second separator so that further separators will be collapsed 4297 // into the second separator. The result will be a pathname 4298 // beginning with "\\\\" followed (most likely) by a host name. 4299 src = dst = path + 1; 4300 path[0] = '\\'; // Force first separator to '\\' 4301 } 4302 } 4303 4304 end = dst; 4305 4306 // Remove redundant separators from remainder of path, forcing all 4307 // separators to be '\\' rather than '/'. Also, single byte space 4308 // characters are removed from the end of the path because those 4309 // are not legal ending characters on this operating system. 4310 // 4311 while (*src != '\0') { 4312 if (isfilesep(*src)) { 4313 *dst++ = '\\'; src++; 4314 while (isfilesep(*src)) src++; 4315 if (*src == '\0') { 4316 // Check for trailing separator 4317 end = dst; 4318 if (colon == dst - 2) break; // "z:\\" 4319 if (dst == path + 1) break; // "\\" 4320 if (dst == path + 2 && isfilesep(path[0])) { 4321 // "\\\\" is not collapsed to "\\" because "\\\\" marks the 4322 // beginning of a UNC pathname. Even though it is not, by 4323 // itself, a valid UNC pathname, we leave it as is in order 4324 // to be consistent with the path canonicalizer as well 4325 // as the win32 APIs, which treat this case as an invalid 4326 // UNC pathname rather than as an alias for the root 4327 // directory of the current drive. 4328 break; 4329 } 4330 end = --dst; // Path does not denote a root directory, so 4331 // remove trailing separator 4332 break; 4333 } 4334 end = dst; 4335 } else { 4336 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character 4337 *dst++ = *src++; 4338 if (*src) *dst++ = *src++; 4339 end = dst; 4340 } else { // Copy a single-byte character 4341 char c = *src++; 4342 *dst++ = c; 4343 // Space is not a legal ending character 4344 if (c != ' ') end = dst; 4345 } 4346 } 4347 } 4348 4349 *end = '\0'; 4350 4351 // For "z:", add "." to work around a bug in the C runtime library 4352 if (colon == dst - 1) { 4353 path[2] = '.'; 4354 path[3] = '\0'; 4355 } 4356 4357 return path; 4358 } 4359 4360 // This code is a copy of JDK's sysSetLength 4361 // from src/windows/hpi/src/sys_api_md.c 4362 4363 int os::ftruncate(int fd, jlong length) { 4364 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4365 long high = (long)(length >> 32); 4366 DWORD ret; 4367 4368 if (h == (HANDLE)(-1)) { 4369 return -1; 4370 } 4371 4372 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 4373 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 4374 return -1; 4375 } 4376 4377 if (::SetEndOfFile(h) == FALSE) { 4378 return -1; 4379 } 4380 4381 return 0; 4382 } 4383 4384 int os::get_fileno(FILE* fp) { 4385 return _fileno(fp); 4386 } 4387 4388 // This code is a copy of JDK's sysSync 4389 // from src/windows/hpi/src/sys_api_md.c 4390 // except for the legacy workaround for a bug in Win 98 4391 4392 int os::fsync(int fd) { 4393 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 4394 4395 if ((!::FlushFileBuffers(handle)) && 4396 (GetLastError() != ERROR_ACCESS_DENIED)) { 4397 // from winerror.h 4398 return -1; 4399 } 4400 return 0; 4401 } 4402 4403 static int nonSeekAvailable(int, long *); 4404 static int stdinAvailable(int, long *); 4405 4406 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR) 4407 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO) 4408 4409 // This code is a copy of JDK's sysAvailable 4410 // from src/windows/hpi/src/sys_api_md.c 4411 4412 int os::available(int fd, jlong *bytes) { 4413 jlong cur, end; 4414 struct _stati64 stbuf64; 4415 4416 if (::_fstati64(fd, &stbuf64) >= 0) { 4417 int mode = stbuf64.st_mode; 4418 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 4419 int ret; 4420 long lpbytes; 4421 if (fd == 0) { 4422 ret = stdinAvailable(fd, &lpbytes); 4423 } else { 4424 ret = nonSeekAvailable(fd, &lpbytes); 4425 } 4426 (*bytes) = (jlong)(lpbytes); 4427 return ret; 4428 } 4429 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 4430 return FALSE; 4431 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 4432 return FALSE; 4433 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 4434 return FALSE; 4435 } 4436 *bytes = end - cur; 4437 return TRUE; 4438 } else { 4439 return FALSE; 4440 } 4441 } 4442 4443 void os::flockfile(FILE* fp) { 4444 _lock_file(fp); 4445 } 4446 4447 void os::funlockfile(FILE* fp) { 4448 _unlock_file(fp); 4449 } 4450 4451 // This code is a copy of JDK's nonSeekAvailable 4452 // from src/windows/hpi/src/sys_api_md.c 4453 4454 static int nonSeekAvailable(int fd, long *pbytes) { 4455 // This is used for available on non-seekable devices 4456 // (like both named and anonymous pipes, such as pipes 4457 // connected to an exec'd process). 4458 // Standard Input is a special case. 4459 HANDLE han; 4460 4461 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 4462 return FALSE; 4463 } 4464 4465 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 4466 // PeekNamedPipe fails when at EOF. In that case we 4467 // simply make *pbytes = 0 which is consistent with the 4468 // behavior we get on Solaris when an fd is at EOF. 4469 // The only alternative is to raise an Exception, 4470 // which isn't really warranted. 4471 // 4472 if (::GetLastError() != ERROR_BROKEN_PIPE) { 4473 return FALSE; 4474 } 4475 *pbytes = 0; 4476 } 4477 return TRUE; 4478 } 4479 4480 #define MAX_INPUT_EVENTS 2000 4481 4482 // This code is a copy of JDK's stdinAvailable 4483 // from src/windows/hpi/src/sys_api_md.c 4484 4485 static int stdinAvailable(int fd, long *pbytes) { 4486 HANDLE han; 4487 DWORD numEventsRead = 0; // Number of events read from buffer 4488 DWORD numEvents = 0; // Number of events in buffer 4489 DWORD i = 0; // Loop index 4490 DWORD curLength = 0; // Position marker 4491 DWORD actualLength = 0; // Number of bytes readable 4492 BOOL error = FALSE; // Error holder 4493 INPUT_RECORD *lpBuffer; // Pointer to records of input events 4494 4495 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4496 return FALSE; 4497 } 4498 4499 // Construct an array of input records in the console buffer 4500 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4501 if (error == 0) { 4502 return nonSeekAvailable(fd, pbytes); 4503 } 4504 4505 // lpBuffer must fit into 64K or else PeekConsoleInput fails 4506 if (numEvents > MAX_INPUT_EVENTS) { 4507 numEvents = MAX_INPUT_EVENTS; 4508 } 4509 4510 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal); 4511 if (lpBuffer == NULL) { 4512 return FALSE; 4513 } 4514 4515 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4516 if (error == 0) { 4517 os::free(lpBuffer); 4518 return FALSE; 4519 } 4520 4521 // Examine input records for the number of bytes available 4522 for (i=0; i<numEvents; i++) { 4523 if (lpBuffer[i].EventType == KEY_EVENT) { 4524 4525 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4526 &(lpBuffer[i].Event); 4527 if (keyRecord->bKeyDown == TRUE) { 4528 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4529 curLength++; 4530 if (*keyPressed == '\r') { 4531 actualLength = curLength; 4532 } 4533 } 4534 } 4535 } 4536 4537 if (lpBuffer != NULL) { 4538 os::free(lpBuffer); 4539 } 4540 4541 *pbytes = (long) actualLength; 4542 return TRUE; 4543 } 4544 4545 // Map a block of memory. 4546 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4547 char *addr, size_t bytes, bool read_only, 4548 bool allow_exec) { 4549 HANDLE hFile; 4550 char* base; 4551 4552 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4553 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4554 if (hFile == NULL) { 4555 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError()); 4556 return NULL; 4557 } 4558 4559 if (allow_exec) { 4560 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4561 // unless it comes from a PE image (which the shared archive is not.) 4562 // Even VirtualProtect refuses to give execute access to mapped memory 4563 // that was not previously executable. 4564 // 4565 // Instead, stick the executable region in anonymous memory. Yuck. 4566 // Penalty is that ~4 pages will not be shareable - in the future 4567 // we might consider DLLizing the shared archive with a proper PE 4568 // header so that mapping executable + sharing is possible. 4569 4570 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4571 PAGE_READWRITE); 4572 if (base == NULL) { 4573 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError()); 4574 CloseHandle(hFile); 4575 return NULL; 4576 } 4577 4578 DWORD bytes_read; 4579 OVERLAPPED overlapped; 4580 overlapped.Offset = (DWORD)file_offset; 4581 overlapped.OffsetHigh = 0; 4582 overlapped.hEvent = NULL; 4583 // ReadFile guarantees that if the return value is true, the requested 4584 // number of bytes were read before returning. 4585 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 4586 if (!res) { 4587 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError()); 4588 release_memory(base, bytes); 4589 CloseHandle(hFile); 4590 return NULL; 4591 } 4592 } else { 4593 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 4594 NULL /* file_name */); 4595 if (hMap == NULL) { 4596 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError()); 4597 CloseHandle(hFile); 4598 return NULL; 4599 } 4600 4601 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 4602 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 4603 (DWORD)bytes, addr); 4604 if (base == NULL) { 4605 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError()); 4606 CloseHandle(hMap); 4607 CloseHandle(hFile); 4608 return NULL; 4609 } 4610 4611 if (CloseHandle(hMap) == 0) { 4612 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError()); 4613 CloseHandle(hFile); 4614 return base; 4615 } 4616 } 4617 4618 if (allow_exec) { 4619 DWORD old_protect; 4620 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 4621 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 4622 4623 if (!res) { 4624 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError()); 4625 // Don't consider this a hard error, on IA32 even if the 4626 // VirtualProtect fails, we should still be able to execute 4627 CloseHandle(hFile); 4628 return base; 4629 } 4630 } 4631 4632 if (CloseHandle(hFile) == 0) { 4633 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError()); 4634 return base; 4635 } 4636 4637 return base; 4638 } 4639 4640 4641 // Remap a block of memory. 4642 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4643 char *addr, size_t bytes, bool read_only, 4644 bool allow_exec) { 4645 // This OS does not allow existing memory maps to be remapped so we 4646 // have to unmap the memory before we remap it. 4647 if (!os::unmap_memory(addr, bytes)) { 4648 return NULL; 4649 } 4650 4651 // There is a very small theoretical window between the unmap_memory() 4652 // call above and the map_memory() call below where a thread in native 4653 // code may be able to access an address that is no longer mapped. 4654 4655 return os::map_memory(fd, file_name, file_offset, addr, bytes, 4656 read_only, allow_exec); 4657 } 4658 4659 4660 // Unmap a block of memory. 4661 // Returns true=success, otherwise false. 4662 4663 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4664 MEMORY_BASIC_INFORMATION mem_info; 4665 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) { 4666 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError()); 4667 return false; 4668 } 4669 4670 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx. 4671 // Instead, executable region was allocated using VirtualAlloc(). See 4672 // pd_map_memory() above. 4673 // 4674 // The following flags should match the 'exec_access' flages used for 4675 // VirtualProtect() in pd_map_memory(). 4676 if (mem_info.Protect == PAGE_EXECUTE_READ || 4677 mem_info.Protect == PAGE_EXECUTE_READWRITE) { 4678 return pd_release_memory(addr, bytes); 4679 } 4680 4681 BOOL result = UnmapViewOfFile(addr); 4682 if (result == 0) { 4683 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError()); 4684 return false; 4685 } 4686 return true; 4687 } 4688 4689 void os::pause() { 4690 char filename[MAX_PATH]; 4691 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4692 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4693 } else { 4694 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4695 } 4696 4697 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4698 if (fd != -1) { 4699 struct stat buf; 4700 ::close(fd); 4701 while (::stat(filename, &buf) == 0) { 4702 Sleep(100); 4703 } 4704 } else { 4705 jio_fprintf(stderr, 4706 "Could not open pause file '%s', continuing immediately.\n", filename); 4707 } 4708 } 4709 4710 Thread* os::ThreadCrashProtection::_protected_thread = NULL; 4711 os::ThreadCrashProtection* os::ThreadCrashProtection::_crash_protection = NULL; 4712 volatile intptr_t os::ThreadCrashProtection::_crash_mux = 0; 4713 4714 os::ThreadCrashProtection::ThreadCrashProtection() { 4715 } 4716 4717 // See the caveats for this class in os_windows.hpp 4718 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back 4719 // into this method and returns false. If no OS EXCEPTION was raised, returns 4720 // true. 4721 // The callback is supposed to provide the method that should be protected. 4722 // 4723 bool os::ThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 4724 4725 Thread::muxAcquire(&_crash_mux, "CrashProtection"); 4726 4727 _protected_thread = Thread::current_or_null(); 4728 assert(_protected_thread != NULL, "Cannot crash protect a NULL thread"); 4729 4730 bool success = true; 4731 __try { 4732 _crash_protection = this; 4733 cb.call(); 4734 } __except(EXCEPTION_EXECUTE_HANDLER) { 4735 // only for protection, nothing to do 4736 success = false; 4737 } 4738 _crash_protection = NULL; 4739 _protected_thread = NULL; 4740 Thread::muxRelease(&_crash_mux); 4741 return success; 4742 } 4743 4744 // An Event wraps a win32 "CreateEvent" kernel handle. 4745 // 4746 // We have a number of choices regarding "CreateEvent" win32 handle leakage: 4747 // 4748 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 4749 // field, and call CloseHandle() on the win32 event handle. Unpark() would 4750 // need to be modified to tolerate finding a NULL (invalid) win32 event handle. 4751 // In addition, an unpark() operation might fetch the handle field, but the 4752 // event could recycle between the fetch and the SetEvent() operation. 4753 // SetEvent() would either fail because the handle was invalid, or inadvertently work, 4754 // as the win32 handle value had been recycled. In an ideal world calling SetEvent() 4755 // on an stale but recycled handle would be harmless, but in practice this might 4756 // confuse other non-Sun code, so it's not a viable approach. 4757 // 4758 // 2: Once a win32 event handle is associated with an Event, it remains associated 4759 // with the Event. The event handle is never closed. This could be construed 4760 // as handle leakage, but only up to the maximum # of threads that have been extant 4761 // at any one time. This shouldn't be an issue, as windows platforms typically 4762 // permit a process to have hundreds of thousands of open handles. 4763 // 4764 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 4765 // and release unused handles. 4766 // 4767 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 4768 // It's not clear, however, that we wouldn't be trading one type of leak for another. 4769 // 4770 // 5. Use an RCU-like mechanism (Read-Copy Update). 4771 // Or perhaps something similar to Maged Michael's "Hazard pointers". 4772 // 4773 // We use (2). 4774 // 4775 // TODO-FIXME: 4776 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 4777 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 4778 // to recover from (or at least detect) the dreaded Windows 841176 bug. 4779 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 4780 // into a single win32 CreateEvent() handle. 4781 // 4782 // Assumption: 4783 // Only one parker can exist on an event, which is why we allocate 4784 // them per-thread. Multiple unparkers can coexist. 4785 // 4786 // _Event transitions in park() 4787 // -1 => -1 : illegal 4788 // 1 => 0 : pass - return immediately 4789 // 0 => -1 : block; then set _Event to 0 before returning 4790 // 4791 // _Event transitions in unpark() 4792 // 0 => 1 : just return 4793 // 1 => 1 : just return 4794 // -1 => either 0 or 1; must signal target thread 4795 // That is, we can safely transition _Event from -1 to either 4796 // 0 or 1. 4797 // 4798 // _Event serves as a restricted-range semaphore. 4799 // -1 : thread is blocked, i.e. there is a waiter 4800 // 0 : neutral: thread is running or ready, 4801 // could have been signaled after a wait started 4802 // 1 : signaled - thread is running or ready 4803 // 4804 // Another possible encoding of _Event would be with 4805 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 4806 // 4807 4808 int os::PlatformEvent::park(jlong Millis) { 4809 // Transitions for _Event: 4810 // -1 => -1 : illegal 4811 // 1 => 0 : pass - return immediately 4812 // 0 => -1 : block; then set _Event to 0 before returning 4813 4814 guarantee(_ParkHandle != NULL , "Invariant"); 4815 guarantee(Millis > 0 , "Invariant"); 4816 4817 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 4818 // the initial park() operation. 4819 // Consider: use atomic decrement instead of CAS-loop 4820 4821 int v; 4822 for (;;) { 4823 v = _Event; 4824 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4825 } 4826 guarantee((v == 0) || (v == 1), "invariant"); 4827 if (v != 0) return OS_OK; 4828 4829 // Do this the hard way by blocking ... 4830 // TODO: consider a brief spin here, gated on the success of recent 4831 // spin attempts by this thread. 4832 // 4833 // We decompose long timeouts into series of shorter timed waits. 4834 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 4835 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 4836 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 4837 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 4838 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 4839 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 4840 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 4841 // for the already waited time. This policy does not admit any new outcomes. 4842 // In the future, however, we might want to track the accumulated wait time and 4843 // adjust Millis accordingly if we encounter a spurious wakeup. 4844 4845 const int MAXTIMEOUT = 0x10000000; 4846 DWORD rv = WAIT_TIMEOUT; 4847 while (_Event < 0 && Millis > 0) { 4848 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT) 4849 if (Millis > MAXTIMEOUT) { 4850 prd = MAXTIMEOUT; 4851 } 4852 rv = ::WaitForSingleObject(_ParkHandle, prd); 4853 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed"); 4854 if (rv == WAIT_TIMEOUT) { 4855 Millis -= prd; 4856 } 4857 } 4858 v = _Event; 4859 _Event = 0; 4860 // see comment at end of os::PlatformEvent::park() below: 4861 OrderAccess::fence(); 4862 // If we encounter a nearly simultanous timeout expiry and unpark() 4863 // we return OS_OK indicating we awoke via unpark(). 4864 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 4865 return (v >= 0) ? OS_OK : OS_TIMEOUT; 4866 } 4867 4868 void os::PlatformEvent::park() { 4869 // Transitions for _Event: 4870 // -1 => -1 : illegal 4871 // 1 => 0 : pass - return immediately 4872 // 0 => -1 : block; then set _Event to 0 before returning 4873 4874 guarantee(_ParkHandle != NULL, "Invariant"); 4875 // Invariant: Only the thread associated with the Event/PlatformEvent 4876 // may call park(). 4877 // Consider: use atomic decrement instead of CAS-loop 4878 int v; 4879 for (;;) { 4880 v = _Event; 4881 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4882 } 4883 guarantee((v == 0) || (v == 1), "invariant"); 4884 if (v != 0) return; 4885 4886 // Do this the hard way by blocking ... 4887 // TODO: consider a brief spin here, gated on the success of recent 4888 // spin attempts by this thread. 4889 while (_Event < 0) { 4890 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE); 4891 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed"); 4892 } 4893 4894 // Usually we'll find _Event == 0 at this point, but as 4895 // an optional optimization we clear it, just in case can 4896 // multiple unpark() operations drove _Event up to 1. 4897 _Event = 0; 4898 OrderAccess::fence(); 4899 guarantee(_Event >= 0, "invariant"); 4900 } 4901 4902 void os::PlatformEvent::unpark() { 4903 guarantee(_ParkHandle != NULL, "Invariant"); 4904 4905 // Transitions for _Event: 4906 // 0 => 1 : just return 4907 // 1 => 1 : just return 4908 // -1 => either 0 or 1; must signal target thread 4909 // That is, we can safely transition _Event from -1 to either 4910 // 0 or 1. 4911 // See also: "Semaphores in Plan 9" by Mullender & Cox 4912 // 4913 // Note: Forcing a transition from "-1" to "1" on an unpark() means 4914 // that it will take two back-to-back park() calls for the owning 4915 // thread to block. This has the benefit of forcing a spurious return 4916 // from the first park() call after an unpark() call which will help 4917 // shake out uses of park() and unpark() without condition variables. 4918 4919 if (Atomic::xchg(1, &_Event) >= 0) return; 4920 4921 ::SetEvent(_ParkHandle); 4922 } 4923 4924 4925 // JSR166 4926 // ------------------------------------------------------- 4927 4928 // The Windows implementation of Park is very straightforward: Basic 4929 // operations on Win32 Events turn out to have the right semantics to 4930 // use them directly. We opportunistically resuse the event inherited 4931 // from Monitor. 4932 4933 void Parker::park(bool isAbsolute, jlong time) { 4934 guarantee(_ParkEvent != NULL, "invariant"); 4935 // First, demultiplex/decode time arguments 4936 if (time < 0) { // don't wait 4937 return; 4938 } else if (time == 0 && !isAbsolute) { 4939 time = INFINITE; 4940 } else if (isAbsolute) { 4941 time -= os::javaTimeMillis(); // convert to relative time 4942 if (time <= 0) { // already elapsed 4943 return; 4944 } 4945 } else { // relative 4946 time /= 1000000; // Must coarsen from nanos to millis 4947 if (time == 0) { // Wait for the minimal time unit if zero 4948 time = 1; 4949 } 4950 } 4951 4952 JavaThread* thread = JavaThread::current(); 4953 4954 // Don't wait if interrupted or already triggered 4955 if (Thread::is_interrupted(thread, false) || 4956 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 4957 ResetEvent(_ParkEvent); 4958 return; 4959 } else { 4960 ThreadBlockInVM tbivm(thread); 4961 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4962 thread->set_suspend_equivalent(); 4963 4964 WaitForSingleObject(_ParkEvent, time); 4965 ResetEvent(_ParkEvent); 4966 4967 // If externally suspended while waiting, re-suspend 4968 if (thread->handle_special_suspend_equivalent_condition()) { 4969 thread->java_suspend_self(); 4970 } 4971 } 4972 } 4973 4974 void Parker::unpark() { 4975 guarantee(_ParkEvent != NULL, "invariant"); 4976 SetEvent(_ParkEvent); 4977 } 4978 4979 // Run the specified command in a separate process. Return its exit value, 4980 // or -1 on failure (e.g. can't create a new process). 4981 int os::fork_and_exec(char* cmd) { 4982 STARTUPINFO si; 4983 PROCESS_INFORMATION pi; 4984 DWORD exit_code; 4985 4986 char * cmd_string; 4987 char * cmd_prefix = "cmd /C "; 4988 size_t len = strlen(cmd) + strlen(cmd_prefix) + 1; 4989 cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal); 4990 if (cmd_string == NULL) { 4991 return -1; 4992 } 4993 cmd_string[0] = '\0'; 4994 strcat(cmd_string, cmd_prefix); 4995 strcat(cmd_string, cmd); 4996 4997 // now replace all '\n' with '&' 4998 char * substring = cmd_string; 4999 while ((substring = strchr(substring, '\n')) != NULL) { 5000 substring[0] = '&'; 5001 substring++; 5002 } 5003 memset(&si, 0, sizeof(si)); 5004 si.cb = sizeof(si); 5005 memset(&pi, 0, sizeof(pi)); 5006 BOOL rslt = CreateProcess(NULL, // executable name - use command line 5007 cmd_string, // command line 5008 NULL, // process security attribute 5009 NULL, // thread security attribute 5010 TRUE, // inherits system handles 5011 0, // no creation flags 5012 NULL, // use parent's environment block 5013 NULL, // use parent's starting directory 5014 &si, // (in) startup information 5015 &pi); // (out) process information 5016 5017 if (rslt) { 5018 // Wait until child process exits. 5019 WaitForSingleObject(pi.hProcess, INFINITE); 5020 5021 GetExitCodeProcess(pi.hProcess, &exit_code); 5022 5023 // Close process and thread handles. 5024 CloseHandle(pi.hProcess); 5025 CloseHandle(pi.hThread); 5026 } else { 5027 exit_code = -1; 5028 } 5029 5030 FREE_C_HEAP_ARRAY(char, cmd_string); 5031 return (int)exit_code; 5032 } 5033 5034 bool os::find(address addr, outputStream* st) { 5035 int offset = -1; 5036 bool result = false; 5037 char buf[256]; 5038 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) { 5039 st->print(PTR_FORMAT " ", addr); 5040 if (strlen(buf) < sizeof(buf) - 1) { 5041 char* p = strrchr(buf, '\\'); 5042 if (p) { 5043 st->print("%s", p + 1); 5044 } else { 5045 st->print("%s", buf); 5046 } 5047 } else { 5048 // The library name is probably truncated. Let's omit the library name. 5049 // See also JDK-8147512. 5050 } 5051 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) { 5052 st->print("::%s + 0x%x", buf, offset); 5053 } 5054 st->cr(); 5055 result = true; 5056 } 5057 return result; 5058 } 5059 5060 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 5061 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 5062 5063 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 5064 JavaThread* thread = JavaThread::current(); 5065 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 5066 address addr = (address) exceptionRecord->ExceptionInformation[1]; 5067 5068 if (os::is_memory_serialize_page(thread, addr)) { 5069 return EXCEPTION_CONTINUE_EXECUTION; 5070 } 5071 } 5072 5073 return EXCEPTION_CONTINUE_SEARCH; 5074 } 5075 5076 // We don't build a headless jre for Windows 5077 bool os::is_headless_jre() { return false; } 5078 5079 static jint initSock() { 5080 WSADATA wsadata; 5081 5082 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) { 5083 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n", 5084 ::GetLastError()); 5085 return JNI_ERR; 5086 } 5087 return JNI_OK; 5088 } 5089 5090 struct hostent* os::get_host_by_name(char* name) { 5091 return (struct hostent*)gethostbyname(name); 5092 } 5093 5094 int os::socket_close(int fd) { 5095 return ::closesocket(fd); 5096 } 5097 5098 int os::socket(int domain, int type, int protocol) { 5099 return ::socket(domain, type, protocol); 5100 } 5101 5102 int os::connect(int fd, struct sockaddr* him, socklen_t len) { 5103 return ::connect(fd, him, len); 5104 } 5105 5106 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5107 return ::recv(fd, buf, (int)nBytes, flags); 5108 } 5109 5110 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5111 return ::send(fd, buf, (int)nBytes, flags); 5112 } 5113 5114 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5115 return ::send(fd, buf, (int)nBytes, flags); 5116 } 5117 5118 // WINDOWS CONTEXT Flags for THREAD_SAMPLING 5119 #if defined(IA32) 5120 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS) 5121 #elif defined (AMD64) 5122 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT) 5123 #endif 5124 5125 // returns true if thread could be suspended, 5126 // false otherwise 5127 static bool do_suspend(HANDLE* h) { 5128 if (h != NULL) { 5129 if (SuspendThread(*h) != ~0) { 5130 return true; 5131 } 5132 } 5133 return false; 5134 } 5135 5136 // resume the thread 5137 // calling resume on an active thread is a no-op 5138 static void do_resume(HANDLE* h) { 5139 if (h != NULL) { 5140 ResumeThread(*h); 5141 } 5142 } 5143 5144 // retrieve a suspend/resume context capable handle 5145 // from the tid. Caller validates handle return value. 5146 void get_thread_handle_for_extended_context(HANDLE* h, 5147 OSThread::thread_id_t tid) { 5148 if (h != NULL) { 5149 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid); 5150 } 5151 } 5152 5153 // Thread sampling implementation 5154 // 5155 void os::SuspendedThreadTask::internal_do_task() { 5156 CONTEXT ctxt; 5157 HANDLE h = NULL; 5158 5159 // get context capable handle for thread 5160 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id()); 5161 5162 // sanity 5163 if (h == NULL || h == INVALID_HANDLE_VALUE) { 5164 return; 5165 } 5166 5167 // suspend the thread 5168 if (do_suspend(&h)) { 5169 ctxt.ContextFlags = sampling_context_flags; 5170 // get thread context 5171 GetThreadContext(h, &ctxt); 5172 SuspendedThreadTaskContext context(_thread, &ctxt); 5173 // pass context to Thread Sampling impl 5174 do_task(context); 5175 // resume thread 5176 do_resume(&h); 5177 } 5178 5179 // close handle 5180 CloseHandle(h); 5181 } 5182 5183 bool os::start_debugging(char *buf, int buflen) { 5184 int len = (int)strlen(buf); 5185 char *p = &buf[len]; 5186 5187 jio_snprintf(p, buflen-len, 5188 "\n\n" 5189 "Do you want to debug the problem?\n\n" 5190 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n" 5191 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n" 5192 "Otherwise, select 'No' to abort...", 5193 os::current_process_id(), os::current_thread_id()); 5194 5195 bool yes = os::message_box("Unexpected Error", buf); 5196 5197 if (yes) { 5198 // os::breakpoint() calls DebugBreak(), which causes a breakpoint 5199 // exception. If VM is running inside a debugger, the debugger will 5200 // catch the exception. Otherwise, the breakpoint exception will reach 5201 // the default windows exception handler, which can spawn a debugger and 5202 // automatically attach to the dying VM. 5203 os::breakpoint(); 5204 yes = false; 5205 } 5206 return yes; 5207 } 5208 5209 void* os::get_default_process_handle() { 5210 return (void*)GetModuleHandle(NULL); 5211 } 5212 5213 // Builds a platform dependent Agent_OnLoad_<lib_name> function name 5214 // which is used to find statically linked in agents. 5215 // Additionally for windows, takes into account __stdcall names. 5216 // Parameters: 5217 // sym_name: Symbol in library we are looking for 5218 // lib_name: Name of library to look in, NULL for shared libs. 5219 // is_absolute_path == true if lib_name is absolute path to agent 5220 // such as "C:/a/b/L.dll" 5221 // == false if only the base name of the library is passed in 5222 // such as "L" 5223 char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 5224 bool is_absolute_path) { 5225 char *agent_entry_name; 5226 size_t len; 5227 size_t name_len; 5228 size_t prefix_len = strlen(JNI_LIB_PREFIX); 5229 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 5230 const char *start; 5231 5232 if (lib_name != NULL) { 5233 len = name_len = strlen(lib_name); 5234 if (is_absolute_path) { 5235 // Need to strip path, prefix and suffix 5236 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 5237 lib_name = ++start; 5238 } else { 5239 // Need to check for drive prefix 5240 if ((start = strchr(lib_name, ':')) != NULL) { 5241 lib_name = ++start; 5242 } 5243 } 5244 if (len <= (prefix_len + suffix_len)) { 5245 return NULL; 5246 } 5247 lib_name += prefix_len; 5248 name_len = strlen(lib_name) - suffix_len; 5249 } 5250 } 5251 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 5252 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 5253 if (agent_entry_name == NULL) { 5254 return NULL; 5255 } 5256 if (lib_name != NULL) { 5257 const char *p = strrchr(sym_name, '@'); 5258 if (p != NULL && p != sym_name) { 5259 // sym_name == _Agent_OnLoad@XX 5260 strncpy(agent_entry_name, sym_name, (p - sym_name)); 5261 agent_entry_name[(p-sym_name)] = '\0'; 5262 // agent_entry_name == _Agent_OnLoad 5263 strcat(agent_entry_name, "_"); 5264 strncat(agent_entry_name, lib_name, name_len); 5265 strcat(agent_entry_name, p); 5266 // agent_entry_name == _Agent_OnLoad_lib_name@XX 5267 } else { 5268 strcpy(agent_entry_name, sym_name); 5269 strcat(agent_entry_name, "_"); 5270 strncat(agent_entry_name, lib_name, name_len); 5271 } 5272 } else { 5273 strcpy(agent_entry_name, sym_name); 5274 } 5275 return agent_entry_name; 5276 } 5277 5278 #ifndef PRODUCT 5279 5280 // test the code path in reserve_memory_special() that tries to allocate memory in a single 5281 // contiguous memory block at a particular address. 5282 // The test first tries to find a good approximate address to allocate at by using the same 5283 // method to allocate some memory at any address. The test then tries to allocate memory in 5284 // the vicinity (not directly after it to avoid possible by-chance use of that location) 5285 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of 5286 // the previously allocated memory is available for allocation. The only actual failure 5287 // that is reported is when the test tries to allocate at a particular location but gets a 5288 // different valid one. A NULL return value at this point is not considered an error but may 5289 // be legitimate. 5290 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages. 5291 void TestReserveMemorySpecial_test() { 5292 if (!UseLargePages) { 5293 if (VerboseInternalVMTests) { 5294 tty->print("Skipping test because large pages are disabled"); 5295 } 5296 return; 5297 } 5298 // save current value of globals 5299 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; 5300 bool old_use_numa_interleaving = UseNUMAInterleaving; 5301 5302 // set globals to make sure we hit the correct code path 5303 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; 5304 5305 // do an allocation at an address selected by the OS to get a good one. 5306 const size_t large_allocation_size = os::large_page_size() * 4; 5307 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); 5308 if (result == NULL) { 5309 if (VerboseInternalVMTests) { 5310 tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.", 5311 large_allocation_size); 5312 } 5313 } else { 5314 os::release_memory_special(result, large_allocation_size); 5315 5316 // allocate another page within the recently allocated memory area which seems to be a good location. At least 5317 // we managed to get it once. 5318 const size_t expected_allocation_size = os::large_page_size(); 5319 char* expected_location = result + os::large_page_size(); 5320 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); 5321 if (actual_location == NULL) { 5322 if (VerboseInternalVMTests) { 5323 tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.", 5324 expected_location, large_allocation_size); 5325 } 5326 } else { 5327 // release memory 5328 os::release_memory_special(actual_location, expected_allocation_size); 5329 // only now check, after releasing any memory to avoid any leaks. 5330 assert(actual_location == expected_location, 5331 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead", 5332 expected_location, expected_allocation_size, actual_location); 5333 } 5334 } 5335 5336 // restore globals 5337 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; 5338 UseNUMAInterleaving = old_use_numa_interleaving; 5339 } 5340 #endif // PRODUCT 5341 5342 /* 5343 All the defined signal names for Windows. 5344 5345 NOTE that not all of these names are accepted by FindSignal! 5346 5347 For various reasons some of these may be rejected at runtime. 5348 5349 Here are the names currently accepted by a user of sun.misc.Signal with 5350 1.4.1 (ignoring potential interaction with use of chaining, etc): 5351 5352 (LIST TBD) 5353 5354 */ 5355 int os::get_signal_number(const char* name) { 5356 static const struct { 5357 char* name; 5358 int number; 5359 } siglabels [] = 5360 // derived from version 6.0 VC98/include/signal.h 5361 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl 5362 "FPE", SIGFPE, // floating point exception 5363 "SEGV", SIGSEGV, // segment violation 5364 "INT", SIGINT, // interrupt 5365 "TERM", SIGTERM, // software term signal from kill 5366 "BREAK", SIGBREAK, // Ctrl-Break sequence 5367 "ILL", SIGILL}; // illegal instruction 5368 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) { 5369 if (strcmp(name, siglabels[i].name) == 0) { 5370 return siglabels[i].number; 5371 } 5372 } 5373 return -1; 5374 } 5375 5376 // Fast current thread access 5377 5378 int os::win32::_thread_ptr_offset = 0; 5379 5380 static void call_wrapper_dummy() {} 5381 5382 // We need to call the os_exception_wrapper once so that it sets 5383 // up the offset from FS of the thread pointer. 5384 void os::win32::initialize_thread_ptr_offset() { 5385 os::os_exception_wrapper((java_call_t)call_wrapper_dummy, 5386 NULL, NULL, NULL, NULL); 5387 }