1 /* 2 * Copyright (c) 1997, 2016, 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 "classfile/classLoader.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "code/icBuffer.hpp" 33 #include "code/vtableStubs.hpp" 34 #include "compiler/compileBroker.hpp" 35 #include "compiler/disassembler.hpp" 36 #include "interpreter/interpreter.hpp" 37 #include "jvm_windows.h" 38 #include "logging/log.hpp" 39 #include "memory/allocation.inline.hpp" 40 #include "memory/filemap.hpp" 41 #include "mutex_windows.inline.hpp" 42 #include "oops/oop.inline.hpp" 43 #include "os_share_windows.hpp" 44 #include "os_windows.inline.hpp" 45 #include "prims/jniFastGetField.hpp" 46 #include "prims/jvm.h" 47 #include "prims/jvm_misc.hpp" 48 #include "runtime/arguments.hpp" 49 #include "runtime/atomic.inline.hpp" 50 #include "runtime/extendedPC.hpp" 51 #include "runtime/globals.hpp" 52 #include "runtime/interfaceSupport.hpp" 53 #include "runtime/java.hpp" 54 #include "runtime/javaCalls.hpp" 55 #include "runtime/mutexLocker.hpp" 56 #include "runtime/objectMonitor.hpp" 57 #include "runtime/orderAccess.inline.hpp" 58 #include "runtime/osThread.hpp" 59 #include "runtime/perfMemory.hpp" 60 #include "runtime/sharedRuntime.hpp" 61 #include "runtime/statSampler.hpp" 62 #include "runtime/stubRoutines.hpp" 63 #include "runtime/thread.inline.hpp" 64 #include "runtime/threadCritical.hpp" 65 #include "runtime/timer.hpp" 66 #include "runtime/vm_version.hpp" 67 #include "semaphore_windows.hpp" 68 #include "services/attachListener.hpp" 69 #include "services/memTracker.hpp" 70 #include "services/runtimeService.hpp" 71 #include "utilities/decoder.hpp" 72 #include "utilities/defaultStream.hpp" 73 #include "utilities/events.hpp" 74 #include "utilities/growableArray.hpp" 75 #include "utilities/macros.hpp" 76 #include "utilities/vmError.hpp" 77 78 #ifdef _DEBUG 79 #include <crtdbg.h> 80 #endif 81 82 83 #include <windows.h> 84 #include <sys/types.h> 85 #include <sys/stat.h> 86 #include <sys/timeb.h> 87 #include <objidl.h> 88 #include <shlobj.h> 89 90 #include <malloc.h> 91 #include <signal.h> 92 #include <direct.h> 93 #include <errno.h> 94 #include <fcntl.h> 95 #include <io.h> 96 #include <process.h> // For _beginthreadex(), _endthreadex() 97 #include <imagehlp.h> // For os::dll_address_to_function_name 98 // for enumerating dll libraries 99 #include <vdmdbg.h> 100 101 // for timer info max values which include all bits 102 #define ALL_64_BITS CONST64(-1) 103 104 // For DLL loading/load error detection 105 // Values of PE COFF 106 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c 107 #define IMAGE_FILE_SIGNATURE_LENGTH 4 108 109 static HANDLE main_process; 110 static HANDLE main_thread; 111 static int main_thread_id; 112 113 static FILETIME process_creation_time; 114 static FILETIME process_exit_time; 115 static FILETIME process_user_time; 116 static FILETIME process_kernel_time; 117 118 #ifdef _M_IA64 119 #define __CPU__ ia64 120 #else 121 #ifdef _M_AMD64 122 #define __CPU__ amd64 123 #else 124 #define __CPU__ i486 125 #endif 126 #endif 127 128 // save DLL module handle, used by GetModuleFileName 129 130 HINSTANCE vm_lib_handle; 131 132 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { 133 switch (reason) { 134 case DLL_PROCESS_ATTACH: 135 vm_lib_handle = hinst; 136 if (ForceTimeHighResolution) { 137 timeBeginPeriod(1L); 138 } 139 break; 140 case DLL_PROCESS_DETACH: 141 if (ForceTimeHighResolution) { 142 timeEndPeriod(1L); 143 } 144 break; 145 default: 146 break; 147 } 148 return true; 149 } 150 151 static inline double fileTimeAsDouble(FILETIME* time) { 152 const double high = (double) ((unsigned int) ~0); 153 const double split = 10000000.0; 154 double result = (time->dwLowDateTime / split) + 155 time->dwHighDateTime * (high/split); 156 return result; 157 } 158 159 // Implementation of os 160 161 bool os::unsetenv(const char* name) { 162 assert(name != NULL, "Null pointer"); 163 return (SetEnvironmentVariable(name, NULL) == TRUE); 164 } 165 166 // No setuid programs under Windows. 167 bool os::have_special_privileges() { 168 return false; 169 } 170 171 172 // This method is a periodic task to check for misbehaving JNI applications 173 // under CheckJNI, we can add any periodic checks here. 174 // For Windows at the moment does nothing 175 void os::run_periodic_checks() { 176 return; 177 } 178 179 // previous UnhandledExceptionFilter, if there is one 180 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL; 181 182 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 183 184 void os::init_system_properties_values() { 185 // sysclasspath, java_home, dll_dir 186 { 187 char *home_path; 188 char *dll_path; 189 char *pslash; 190 char *bin = "\\bin"; 191 char home_dir[MAX_PATH + 1]; 192 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR"); 193 194 if (alt_home_dir != NULL) { 195 strncpy(home_dir, alt_home_dir, MAX_PATH + 1); 196 home_dir[MAX_PATH] = '\0'; 197 } else { 198 os::jvm_path(home_dir, sizeof(home_dir)); 199 // Found the full path to jvm.dll. 200 // Now cut the path to <java_home>/jre if we can. 201 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll 202 pslash = strrchr(home_dir, '\\'); 203 if (pslash != NULL) { 204 *pslash = '\0'; // get rid of \{client|server} 205 pslash = strrchr(home_dir, '\\'); 206 if (pslash != NULL) { 207 *pslash = '\0'; // get rid of \bin 208 } 209 } 210 } 211 212 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal); 213 if (home_path == NULL) { 214 return; 215 } 216 strcpy(home_path, home_dir); 217 Arguments::set_java_home(home_path); 218 FREE_C_HEAP_ARRAY(char, home_path); 219 220 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, 221 mtInternal); 222 if (dll_path == NULL) { 223 return; 224 } 225 strcpy(dll_path, home_dir); 226 strcat(dll_path, bin); 227 Arguments::set_dll_dir(dll_path); 228 FREE_C_HEAP_ARRAY(char, dll_path); 229 230 if (!set_boot_path('\\', ';')) { 231 return; 232 } 233 } 234 235 // library_path 236 #define EXT_DIR "\\lib\\ext" 237 #define BIN_DIR "\\bin" 238 #define PACKAGE_DIR "\\Sun\\Java" 239 { 240 // Win32 library search order (See the documentation for LoadLibrary): 241 // 242 // 1. The directory from which application is loaded. 243 // 2. The system wide Java Extensions directory (Java only) 244 // 3. System directory (GetSystemDirectory) 245 // 4. Windows directory (GetWindowsDirectory) 246 // 5. The PATH environment variable 247 // 6. The current directory 248 249 char *library_path; 250 char tmp[MAX_PATH]; 251 char *path_str = ::getenv("PATH"); 252 253 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 254 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal); 255 256 library_path[0] = '\0'; 257 258 GetModuleFileName(NULL, tmp, sizeof(tmp)); 259 *(strrchr(tmp, '\\')) = '\0'; 260 strcat(library_path, tmp); 261 262 GetWindowsDirectory(tmp, sizeof(tmp)); 263 strcat(library_path, ";"); 264 strcat(library_path, tmp); 265 strcat(library_path, PACKAGE_DIR BIN_DIR); 266 267 GetSystemDirectory(tmp, sizeof(tmp)); 268 strcat(library_path, ";"); 269 strcat(library_path, tmp); 270 271 GetWindowsDirectory(tmp, sizeof(tmp)); 272 strcat(library_path, ";"); 273 strcat(library_path, tmp); 274 275 if (path_str) { 276 strcat(library_path, ";"); 277 strcat(library_path, path_str); 278 } 279 280 strcat(library_path, ";."); 281 282 Arguments::set_library_path(library_path); 283 FREE_C_HEAP_ARRAY(char, library_path); 284 } 285 286 // Default extensions directory 287 { 288 char path[MAX_PATH]; 289 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 290 GetWindowsDirectory(path, MAX_PATH); 291 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 292 path, PACKAGE_DIR, EXT_DIR); 293 Arguments::set_ext_dirs(buf); 294 } 295 #undef EXT_DIR 296 #undef BIN_DIR 297 #undef PACKAGE_DIR 298 299 #ifndef _WIN64 300 // set our UnhandledExceptionFilter and save any previous one 301 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception); 302 #endif 303 304 // Done 305 return; 306 } 307 308 void os::breakpoint() { 309 DebugBreak(); 310 } 311 312 // Invoked from the BREAKPOINT Macro 313 extern "C" void breakpoint() { 314 os::breakpoint(); 315 } 316 317 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP. 318 // So far, this method is only used by Native Memory Tracking, which is 319 // only supported on Windows XP or later. 320 // 321 int os::get_native_stack(address* stack, int frames, int toSkip) { 322 #ifdef _NMT_NOINLINE_ 323 toSkip++; 324 #endif 325 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL); 326 for (int index = captured; index < frames; index ++) { 327 stack[index] = NULL; 328 } 329 return captured; 330 } 331 332 333 // os::current_stack_base() 334 // 335 // Returns the base of the stack, which is the stack's 336 // starting address. This function must be called 337 // while running on the stack of the thread being queried. 338 339 address os::current_stack_base() { 340 MEMORY_BASIC_INFORMATION minfo; 341 address stack_bottom; 342 size_t stack_size; 343 344 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 345 stack_bottom = (address)minfo.AllocationBase; 346 stack_size = minfo.RegionSize; 347 348 // Add up the sizes of all the regions with the same 349 // AllocationBase. 350 while (1) { 351 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 352 if (stack_bottom == (address)minfo.AllocationBase) { 353 stack_size += minfo.RegionSize; 354 } else { 355 break; 356 } 357 } 358 359 #ifdef _M_IA64 360 // IA64 has memory and register stacks 361 // 362 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit 363 // at thread creation (1MB backing store growing upwards, 1MB memory stack 364 // growing downwards, 2MB summed up) 365 // 366 // ... 367 // ------- top of stack (high address) ----- 368 // | 369 // | 1MB 370 // | Backing Store (Register Stack) 371 // | 372 // | / \ 373 // | | 374 // | | 375 // | | 376 // ------------------------ stack base ----- 377 // | 1MB 378 // | Memory Stack 379 // | 380 // | | 381 // | | 382 // | | 383 // | \ / 384 // | 385 // ----- bottom of stack (low address) ----- 386 // ... 387 388 stack_size = stack_size / 2; 389 #endif 390 return stack_bottom + stack_size; 391 } 392 393 size_t os::current_stack_size() { 394 size_t sz; 395 MEMORY_BASIC_INFORMATION minfo; 396 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 397 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 398 return sz; 399 } 400 401 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 402 const struct tm* time_struct_ptr = localtime(clock); 403 if (time_struct_ptr != NULL) { 404 *res = *time_struct_ptr; 405 return res; 406 } 407 return NULL; 408 } 409 410 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 411 412 // Thread start routine for all newly created threads 413 static unsigned __stdcall thread_native_entry(Thread* thread) { 414 // Try to randomize the cache line index of hot stack frames. 415 // This helps when threads of the same stack traces evict each other's 416 // cache lines. The threads can be either from the same JVM instance, or 417 // from different JVM instances. The benefit is especially true for 418 // processors with hyperthreading technology. 419 static int counter = 0; 420 int pid = os::current_process_id(); 421 _alloca(((pid ^ counter++) & 7) * 128); 422 423 thread->initialize_thread_current(); 424 425 OSThread* osthr = thread->osthread(); 426 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 427 428 if (UseNUMA) { 429 int lgrp_id = os::numa_get_group_id(); 430 if (lgrp_id != -1) { 431 thread->set_lgrp_id(lgrp_id); 432 } 433 } 434 435 // Diagnostic code to investigate JDK-6573254 436 int res = 30115; // non-java thread 437 if (thread->is_Java_thread()) { 438 res = 20115; // java thread 439 } 440 441 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id()); 442 443 // Install a win32 structured exception handler around every thread created 444 // by VM, so VM can generate error dump when an exception occurred in non- 445 // Java thread (e.g. VM thread). 446 __try { 447 thread->run(); 448 } __except(topLevelExceptionFilter( 449 (_EXCEPTION_POINTERS*)_exception_info())) { 450 // Nothing to do. 451 } 452 453 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); 454 455 // One less thread is executing 456 // When the VMThread gets here, the main thread may have already exited 457 // which frees the CodeHeap containing the Atomic::add code 458 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 459 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); 460 } 461 462 // If a thread has not deleted itself ("delete this") as part of its 463 // termination sequence, we have to ensure thread-local-storage is 464 // cleared before we actually terminate. No threads should ever be 465 // deleted asynchronously with respect to their termination. 466 if (Thread::current_or_null_safe() != NULL) { 467 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 468 thread->clear_thread_current(); 469 } 470 471 // Thread must not return from exit_process_or_thread(), but if it does, 472 // let it proceed to exit normally 473 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res); 474 } 475 476 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, 477 int thread_id) { 478 // Allocate the OSThread object 479 OSThread* osthread = new OSThread(NULL, NULL); 480 if (osthread == NULL) return NULL; 481 482 // Initialize support for Java interrupts 483 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 484 if (interrupt_event == NULL) { 485 delete osthread; 486 return NULL; 487 } 488 osthread->set_interrupt_event(interrupt_event); 489 490 // Store info on the Win32 thread into the OSThread 491 osthread->set_thread_handle(thread_handle); 492 osthread->set_thread_id(thread_id); 493 494 if (UseNUMA) { 495 int lgrp_id = os::numa_get_group_id(); 496 if (lgrp_id != -1) { 497 thread->set_lgrp_id(lgrp_id); 498 } 499 } 500 501 // Initial thread state is INITIALIZED, not SUSPENDED 502 osthread->set_state(INITIALIZED); 503 504 return osthread; 505 } 506 507 508 bool os::create_attached_thread(JavaThread* thread) { 509 #ifdef ASSERT 510 thread->verify_not_published(); 511 #endif 512 HANDLE thread_h; 513 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 514 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 515 fatal("DuplicateHandle failed\n"); 516 } 517 OSThread* osthread = create_os_thread(thread, thread_h, 518 (int)current_thread_id()); 519 if (osthread == NULL) { 520 return false; 521 } 522 523 // Initial thread state is RUNNABLE 524 osthread->set_state(RUNNABLE); 525 526 thread->set_osthread(osthread); 527 528 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", 529 os::current_thread_id()); 530 531 return true; 532 } 533 534 bool os::create_main_thread(JavaThread* thread) { 535 #ifdef ASSERT 536 thread->verify_not_published(); 537 #endif 538 if (_starting_thread == NULL) { 539 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 540 if (_starting_thread == NULL) { 541 return false; 542 } 543 } 544 545 // The primordial thread is runnable from the start) 546 _starting_thread->set_state(RUNNABLE); 547 548 thread->set_osthread(_starting_thread); 549 return true; 550 } 551 552 // Helper function to trace _beginthreadex attributes, 553 // similar to os::Posix::describe_pthread_attr() 554 static char* describe_beginthreadex_attributes(char* buf, size_t buflen, 555 size_t stacksize, unsigned initflag) { 556 stringStream ss(buf, buflen); 557 if (stacksize == 0) { 558 ss.print("stacksize: default, "); 559 } else { 560 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); 561 } 562 ss.print("flags: "); 563 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " "); 564 #define ALL(X) \ 565 X(CREATE_SUSPENDED) \ 566 X(STACK_SIZE_PARAM_IS_A_RESERVATION) 567 ALL(PRINT_FLAG) 568 #undef ALL 569 #undef PRINT_FLAG 570 return buf; 571 } 572 573 // Allocate and initialize a new OSThread 574 bool os::create_thread(Thread* thread, ThreadType thr_type, 575 size_t stack_size) { 576 unsigned thread_id; 577 578 // Allocate the OSThread object 579 OSThread* osthread = new OSThread(NULL, NULL); 580 if (osthread == NULL) { 581 return false; 582 } 583 584 // Initialize support for Java interrupts 585 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 586 if (interrupt_event == NULL) { 587 delete osthread; 588 return NULL; 589 } 590 osthread->set_interrupt_event(interrupt_event); 591 osthread->set_interrupted(false); 592 593 thread->set_osthread(osthread); 594 595 if (stack_size == 0) { 596 switch (thr_type) { 597 case os::java_thread: 598 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 599 if (JavaThread::stack_size_at_create() > 0) { 600 stack_size = JavaThread::stack_size_at_create(); 601 } 602 break; 603 case os::compiler_thread: 604 if (CompilerThreadStackSize > 0) { 605 stack_size = (size_t)(CompilerThreadStackSize * K); 606 break; 607 } // else fall through: 608 // use VMThreadStackSize if CompilerThreadStackSize is not defined 609 case os::vm_thread: 610 case os::pgc_thread: 611 case os::cgc_thread: 612 case os::watcher_thread: 613 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 614 break; 615 } 616 } 617 618 // Create the Win32 thread 619 // 620 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 621 // does not specify stack size. Instead, it specifies the size of 622 // initially committed space. The stack size is determined by 623 // PE header in the executable. If the committed "stack_size" is larger 624 // than default value in the PE header, the stack is rounded up to the 625 // nearest multiple of 1MB. For example if the launcher has default 626 // stack size of 320k, specifying any size less than 320k does not 627 // affect the actual stack size at all, it only affects the initial 628 // commitment. On the other hand, specifying 'stack_size' larger than 629 // default value may cause significant increase in memory usage, because 630 // not only the stack space will be rounded up to MB, but also the 631 // entire space is committed upfront. 632 // 633 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 634 // for CreateThread() that can treat 'stack_size' as stack size. However we 635 // are not supposed to call CreateThread() directly according to MSDN 636 // document because JVM uses C runtime library. The good news is that the 637 // flag appears to work with _beginthredex() as well. 638 639 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION; 640 HANDLE thread_handle = 641 (HANDLE)_beginthreadex(NULL, 642 (unsigned)stack_size, 643 (unsigned (__stdcall *)(void*)) thread_native_entry, 644 thread, 645 initflag, 646 &thread_id); 647 648 char buf[64]; 649 if (thread_handle != NULL) { 650 log_info(os, thread)("Thread started (tid: %u, attributes: %s)", 651 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag)); 652 } else { 653 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.", 654 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag)); 655 } 656 657 if (thread_handle == NULL) { 658 // Need to clean up stuff we've allocated so far 659 CloseHandle(osthread->interrupt_event()); 660 thread->set_osthread(NULL); 661 delete osthread; 662 return NULL; 663 } 664 665 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); 666 667 // Store info on the Win32 thread into the OSThread 668 osthread->set_thread_handle(thread_handle); 669 osthread->set_thread_id(thread_id); 670 671 // Initial thread state is INITIALIZED, not SUSPENDED 672 osthread->set_state(INITIALIZED); 673 674 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 675 return true; 676 } 677 678 679 // Free Win32 resources related to the OSThread 680 void os::free_thread(OSThread* osthread) { 681 assert(osthread != NULL, "osthread not set"); 682 683 // We are told to free resources of the argument thread, 684 // but we can only really operate on the current thread. 685 assert(Thread::current()->osthread() == osthread, 686 "os::free_thread but not current thread"); 687 688 CloseHandle(osthread->thread_handle()); 689 CloseHandle(osthread->interrupt_event()); 690 delete osthread; 691 } 692 693 static jlong first_filetime; 694 static jlong initial_performance_count; 695 static jlong performance_frequency; 696 697 698 jlong as_long(LARGE_INTEGER x) { 699 jlong result = 0; // initialization to avoid warning 700 set_high(&result, x.HighPart); 701 set_low(&result, x.LowPart); 702 return result; 703 } 704 705 706 jlong os::elapsed_counter() { 707 LARGE_INTEGER count; 708 QueryPerformanceCounter(&count); 709 return as_long(count) - initial_performance_count; 710 } 711 712 713 jlong os::elapsed_frequency() { 714 return performance_frequency; 715 } 716 717 718 julong os::available_memory() { 719 return win32::available_memory(); 720 } 721 722 julong os::win32::available_memory() { 723 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 724 // value if total memory is larger than 4GB 725 MEMORYSTATUSEX ms; 726 ms.dwLength = sizeof(ms); 727 GlobalMemoryStatusEx(&ms); 728 729 return (julong)ms.ullAvailPhys; 730 } 731 732 julong os::physical_memory() { 733 return win32::physical_memory(); 734 } 735 736 bool os::has_allocatable_memory_limit(julong* limit) { 737 MEMORYSTATUSEX ms; 738 ms.dwLength = sizeof(ms); 739 GlobalMemoryStatusEx(&ms); 740 #ifdef _LP64 741 *limit = (julong)ms.ullAvailVirtual; 742 return true; 743 #else 744 // Limit to 1400m because of the 2gb address space wall 745 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual); 746 return true; 747 #endif 748 } 749 750 int os::active_processor_count() { 751 DWORD_PTR lpProcessAffinityMask = 0; 752 DWORD_PTR lpSystemAffinityMask = 0; 753 int proc_count = processor_count(); 754 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 755 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 756 // Nof active processors is number of bits in process affinity mask 757 int bitcount = 0; 758 while (lpProcessAffinityMask != 0) { 759 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 760 bitcount++; 761 } 762 return bitcount; 763 } else { 764 return proc_count; 765 } 766 } 767 768 void os::set_native_thread_name(const char *name) { 769 770 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx 771 // 772 // Note that unfortunately this only works if the process 773 // is already attached to a debugger; debugger must observe 774 // the exception below to show the correct name. 775 776 const DWORD MS_VC_EXCEPTION = 0x406D1388; 777 struct { 778 DWORD dwType; // must be 0x1000 779 LPCSTR szName; // pointer to name (in user addr space) 780 DWORD dwThreadID; // thread ID (-1=caller thread) 781 DWORD dwFlags; // reserved for future use, must be zero 782 } info; 783 784 info.dwType = 0x1000; 785 info.szName = name; 786 info.dwThreadID = -1; 787 info.dwFlags = 0; 788 789 __try { 790 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info ); 791 } __except(EXCEPTION_CONTINUE_EXECUTION) {} 792 } 793 794 bool os::distribute_processes(uint length, uint* distribution) { 795 // Not yet implemented. 796 return false; 797 } 798 799 bool os::bind_to_processor(uint processor_id) { 800 // Not yet implemented. 801 return false; 802 } 803 804 void os::win32::initialize_performance_counter() { 805 LARGE_INTEGER count; 806 QueryPerformanceFrequency(&count); 807 performance_frequency = as_long(count); 808 QueryPerformanceCounter(&count); 809 initial_performance_count = as_long(count); 810 } 811 812 813 double os::elapsedTime() { 814 return (double) elapsed_counter() / (double) elapsed_frequency(); 815 } 816 817 818 // Windows format: 819 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 820 // Java format: 821 // Java standards require the number of milliseconds since 1/1/1970 822 823 // Constant offset - calculated using offset() 824 static jlong _offset = 116444736000000000; 825 // Fake time counter for reproducible results when debugging 826 static jlong fake_time = 0; 827 828 #ifdef ASSERT 829 // Just to be safe, recalculate the offset in debug mode 830 static jlong _calculated_offset = 0; 831 static int _has_calculated_offset = 0; 832 833 jlong offset() { 834 if (_has_calculated_offset) return _calculated_offset; 835 SYSTEMTIME java_origin; 836 java_origin.wYear = 1970; 837 java_origin.wMonth = 1; 838 java_origin.wDayOfWeek = 0; // ignored 839 java_origin.wDay = 1; 840 java_origin.wHour = 0; 841 java_origin.wMinute = 0; 842 java_origin.wSecond = 0; 843 java_origin.wMilliseconds = 0; 844 FILETIME jot; 845 if (!SystemTimeToFileTime(&java_origin, &jot)) { 846 fatal("Error = %d\nWindows error", GetLastError()); 847 } 848 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 849 _has_calculated_offset = 1; 850 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 851 return _calculated_offset; 852 } 853 #else 854 jlong offset() { 855 return _offset; 856 } 857 #endif 858 859 jlong windows_to_java_time(FILETIME wt) { 860 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 861 return (a - offset()) / 10000; 862 } 863 864 // Returns time ticks in (10th of micro seconds) 865 jlong windows_to_time_ticks(FILETIME wt) { 866 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 867 return (a - offset()); 868 } 869 870 FILETIME java_to_windows_time(jlong l) { 871 jlong a = (l * 10000) + offset(); 872 FILETIME result; 873 result.dwHighDateTime = high(a); 874 result.dwLowDateTime = low(a); 875 return result; 876 } 877 878 bool os::supports_vtime() { return true; } 879 bool os::enable_vtime() { return false; } 880 bool os::vtime_enabled() { return false; } 881 882 double os::elapsedVTime() { 883 FILETIME created; 884 FILETIME exited; 885 FILETIME kernel; 886 FILETIME user; 887 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) { 888 // the resolution of windows_to_java_time() should be sufficient (ms) 889 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS; 890 } else { 891 return elapsedTime(); 892 } 893 } 894 895 jlong os::javaTimeMillis() { 896 if (UseFakeTimers) { 897 return fake_time++; 898 } else { 899 FILETIME wt; 900 GetSystemTimeAsFileTime(&wt); 901 return windows_to_java_time(wt); 902 } 903 } 904 905 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 906 FILETIME wt; 907 GetSystemTimeAsFileTime(&wt); 908 jlong ticks = windows_to_time_ticks(wt); // 10th of micros 909 jlong secs = jlong(ticks / 10000000); // 10000 * 1000 910 seconds = secs; 911 nanos = jlong(ticks - (secs*10000000)) * 100; 912 } 913 914 jlong os::javaTimeNanos() { 915 LARGE_INTEGER current_count; 916 QueryPerformanceCounter(¤t_count); 917 double current = as_long(current_count); 918 double freq = performance_frequency; 919 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC); 920 return time; 921 } 922 923 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 924 jlong freq = performance_frequency; 925 if (freq < NANOSECS_PER_SEC) { 926 // the performance counter is 64 bits and we will 927 // be multiplying it -- so no wrap in 64 bits 928 info_ptr->max_value = ALL_64_BITS; 929 } else if (freq > NANOSECS_PER_SEC) { 930 // use the max value the counter can reach to 931 // determine the max value which could be returned 932 julong max_counter = (julong)ALL_64_BITS; 933 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC)); 934 } else { 935 // the performance counter is 64 bits and we will 936 // be using it directly -- so no wrap in 64 bits 937 info_ptr->max_value = ALL_64_BITS; 938 } 939 940 // using a counter, so no skipping 941 info_ptr->may_skip_backward = false; 942 info_ptr->may_skip_forward = false; 943 944 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 945 } 946 947 char* os::local_time_string(char *buf, size_t buflen) { 948 SYSTEMTIME st; 949 GetLocalTime(&st); 950 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 951 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 952 return buf; 953 } 954 955 bool os::getTimesSecs(double* process_real_time, 956 double* process_user_time, 957 double* process_system_time) { 958 HANDLE h_process = GetCurrentProcess(); 959 FILETIME create_time, exit_time, kernel_time, user_time; 960 BOOL result = GetProcessTimes(h_process, 961 &create_time, 962 &exit_time, 963 &kernel_time, 964 &user_time); 965 if (result != 0) { 966 FILETIME wt; 967 GetSystemTimeAsFileTime(&wt); 968 jlong rtc_millis = windows_to_java_time(wt); 969 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 970 *process_user_time = 971 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS); 972 *process_system_time = 973 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS); 974 return true; 975 } else { 976 return false; 977 } 978 } 979 980 void os::shutdown() { 981 // allow PerfMemory to attempt cleanup of any persistent resources 982 perfMemory_exit(); 983 984 // flush buffered output, finish log files 985 ostream_abort(); 986 987 // Check for abort hook 988 abort_hook_t abort_hook = Arguments::abort_hook(); 989 if (abort_hook != NULL) { 990 abort_hook(); 991 } 992 } 993 994 995 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 996 PMINIDUMP_EXCEPTION_INFORMATION, 997 PMINIDUMP_USER_STREAM_INFORMATION, 998 PMINIDUMP_CALLBACK_INFORMATION); 999 1000 static HANDLE dumpFile = NULL; 1001 1002 // Check if dump file can be created. 1003 void os::check_dump_limit(char* buffer, size_t buffsz) { 1004 bool status = true; 1005 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) { 1006 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line"); 1007 status = false; 1008 } 1009 1010 #ifndef ASSERT 1011 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) { 1012 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows"); 1013 status = false; 1014 } 1015 #endif 1016 1017 if (status) { 1018 const char* cwd = get_current_directory(NULL, 0); 1019 int pid = current_process_id(); 1020 if (cwd != NULL) { 1021 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid); 1022 } else { 1023 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid); 1024 } 1025 1026 if (dumpFile == NULL && 1027 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL)) 1028 == INVALID_HANDLE_VALUE) { 1029 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError()); 1030 status = false; 1031 } 1032 } 1033 VMError::record_coredump_status(buffer, status); 1034 } 1035 1036 void os::abort(bool dump_core, void* siginfo, const void* context) { 1037 HINSTANCE dbghelp; 1038 EXCEPTION_POINTERS ep; 1039 MINIDUMP_EXCEPTION_INFORMATION mei; 1040 MINIDUMP_EXCEPTION_INFORMATION* pmei; 1041 1042 HANDLE hProcess = GetCurrentProcess(); 1043 DWORD processId = GetCurrentProcessId(); 1044 MINIDUMP_TYPE dumpType; 1045 1046 shutdown(); 1047 if (!dump_core || dumpFile == NULL) { 1048 if (dumpFile != NULL) { 1049 CloseHandle(dumpFile); 1050 } 1051 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1052 } 1053 1054 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0); 1055 1056 if (dbghelp == NULL) { 1057 jio_fprintf(stderr, "Failed to load dbghelp.dll\n"); 1058 CloseHandle(dumpFile); 1059 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1060 } 1061 1062 _MiniDumpWriteDump = 1063 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 1064 PMINIDUMP_EXCEPTION_INFORMATION, 1065 PMINIDUMP_USER_STREAM_INFORMATION, 1066 PMINIDUMP_CALLBACK_INFORMATION), 1067 GetProcAddress(dbghelp, 1068 "MiniDumpWriteDump")); 1069 1070 if (_MiniDumpWriteDump == NULL) { 1071 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n"); 1072 CloseHandle(dumpFile); 1073 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1074 } 1075 1076 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData | 1077 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules); 1078 1079 if (siginfo != NULL && context != NULL) { 1080 ep.ContextRecord = (PCONTEXT) context; 1081 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo; 1082 1083 mei.ThreadId = GetCurrentThreadId(); 1084 mei.ExceptionPointers = &ep; 1085 pmei = &mei; 1086 } else { 1087 pmei = NULL; 1088 } 1089 1090 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all 1091 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then. 1092 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false && 1093 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) { 1094 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError()); 1095 } 1096 CloseHandle(dumpFile); 1097 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1098 } 1099 1100 // Die immediately, no exit hook, no abort hook, no cleanup. 1101 void os::die() { 1102 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1); 1103 } 1104 1105 // Directory routines copied from src/win32/native/java/io/dirent_md.c 1106 // * dirent_md.c 1.15 00/02/02 1107 // 1108 // The declarations for DIR and struct dirent are in jvm_win32.h. 1109 1110 // Caller must have already run dirname through JVM_NativePath, which removes 1111 // duplicate slashes and converts all instances of '/' into '\\'. 1112 1113 DIR * os::opendir(const char *dirname) { 1114 assert(dirname != NULL, "just checking"); // hotspot change 1115 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal); 1116 DWORD fattr; // hotspot change 1117 char alt_dirname[4] = { 0, 0, 0, 0 }; 1118 1119 if (dirp == 0) { 1120 errno = ENOMEM; 1121 return 0; 1122 } 1123 1124 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it 1125 // as a directory in FindFirstFile(). We detect this case here and 1126 // prepend the current drive name. 1127 // 1128 if (dirname[1] == '\0' && dirname[0] == '\\') { 1129 alt_dirname[0] = _getdrive() + 'A' - 1; 1130 alt_dirname[1] = ':'; 1131 alt_dirname[2] = '\\'; 1132 alt_dirname[3] = '\0'; 1133 dirname = alt_dirname; 1134 } 1135 1136 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal); 1137 if (dirp->path == 0) { 1138 free(dirp); 1139 errno = ENOMEM; 1140 return 0; 1141 } 1142 strcpy(dirp->path, dirname); 1143 1144 fattr = GetFileAttributes(dirp->path); 1145 if (fattr == 0xffffffff) { 1146 free(dirp->path); 1147 free(dirp); 1148 errno = ENOENT; 1149 return 0; 1150 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 1151 free(dirp->path); 1152 free(dirp); 1153 errno = ENOTDIR; 1154 return 0; 1155 } 1156 1157 // Append "*.*", or possibly "\\*.*", to path 1158 if (dirp->path[1] == ':' && 1159 (dirp->path[2] == '\0' || 1160 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 1161 // No '\\' needed for cases like "Z:" or "Z:\" 1162 strcat(dirp->path, "*.*"); 1163 } else { 1164 strcat(dirp->path, "\\*.*"); 1165 } 1166 1167 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 1168 if (dirp->handle == INVALID_HANDLE_VALUE) { 1169 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 1170 free(dirp->path); 1171 free(dirp); 1172 errno = EACCES; 1173 return 0; 1174 } 1175 } 1176 return dirp; 1177 } 1178 1179 // parameter dbuf unused on Windows 1180 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) { 1181 assert(dirp != NULL, "just checking"); // hotspot change 1182 if (dirp->handle == INVALID_HANDLE_VALUE) { 1183 return 0; 1184 } 1185 1186 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 1187 1188 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 1189 if (GetLastError() == ERROR_INVALID_HANDLE) { 1190 errno = EBADF; 1191 return 0; 1192 } 1193 FindClose(dirp->handle); 1194 dirp->handle = INVALID_HANDLE_VALUE; 1195 } 1196 1197 return &dirp->dirent; 1198 } 1199 1200 int os::closedir(DIR *dirp) { 1201 assert(dirp != NULL, "just checking"); // hotspot change 1202 if (dirp->handle != INVALID_HANDLE_VALUE) { 1203 if (!FindClose(dirp->handle)) { 1204 errno = EBADF; 1205 return -1; 1206 } 1207 dirp->handle = INVALID_HANDLE_VALUE; 1208 } 1209 free(dirp->path); 1210 free(dirp); 1211 return 0; 1212 } 1213 1214 // This must be hard coded because it's the system's temporary 1215 // directory not the java application's temp directory, ala java.io.tmpdir. 1216 const char* os::get_temp_directory() { 1217 static char path_buf[MAX_PATH]; 1218 if (GetTempPath(MAX_PATH, path_buf) > 0) { 1219 return path_buf; 1220 } else { 1221 path_buf[0] = '\0'; 1222 return path_buf; 1223 } 1224 } 1225 1226 static bool file_exists(const char* filename) { 1227 if (filename == NULL || strlen(filename) == 0) { 1228 return false; 1229 } 1230 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES; 1231 } 1232 1233 bool os::dll_build_name(char *buffer, size_t buflen, 1234 const char* pname, const char* fname) { 1235 bool retval = false; 1236 const size_t pnamelen = pname ? strlen(pname) : 0; 1237 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0; 1238 1239 // Return error on buffer overflow. 1240 if (pnamelen + strlen(fname) + 10 > buflen) { 1241 return retval; 1242 } 1243 1244 if (pnamelen == 0) { 1245 jio_snprintf(buffer, buflen, "%s.dll", fname); 1246 retval = true; 1247 } else if (c == ':' || c == '\\') { 1248 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname); 1249 retval = true; 1250 } else if (strchr(pname, *os::path_separator()) != NULL) { 1251 int n; 1252 char** pelements = split_path(pname, &n); 1253 if (pelements == NULL) { 1254 return false; 1255 } 1256 for (int i = 0; i < n; i++) { 1257 char* path = pelements[i]; 1258 // Really shouldn't be NULL, but check can't hurt 1259 size_t plen = (path == NULL) ? 0 : strlen(path); 1260 if (plen == 0) { 1261 continue; // skip the empty path values 1262 } 1263 const char lastchar = path[plen - 1]; 1264 if (lastchar == ':' || lastchar == '\\') { 1265 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname); 1266 } else { 1267 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname); 1268 } 1269 if (file_exists(buffer)) { 1270 retval = true; 1271 break; 1272 } 1273 } 1274 // release the storage 1275 for (int i = 0; i < n; i++) { 1276 if (pelements[i] != NULL) { 1277 FREE_C_HEAP_ARRAY(char, pelements[i]); 1278 } 1279 } 1280 if (pelements != NULL) { 1281 FREE_C_HEAP_ARRAY(char*, pelements); 1282 } 1283 } else { 1284 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname); 1285 retval = true; 1286 } 1287 return retval; 1288 } 1289 1290 // Needs to be in os specific directory because windows requires another 1291 // header file <direct.h> 1292 const char* os::get_current_directory(char *buf, size_t buflen) { 1293 int n = static_cast<int>(buflen); 1294 if (buflen > INT_MAX) n = INT_MAX; 1295 return _getcwd(buf, n); 1296 } 1297 1298 //----------------------------------------------------------- 1299 // Helper functions for fatal error handler 1300 #ifdef _WIN64 1301 // Helper routine which returns true if address in 1302 // within the NTDLL address space. 1303 // 1304 static bool _addr_in_ntdll(address addr) { 1305 HMODULE hmod; 1306 MODULEINFO minfo; 1307 1308 hmod = GetModuleHandle("NTDLL.DLL"); 1309 if (hmod == NULL) return false; 1310 if (!GetModuleInformation(GetCurrentProcess(), hmod, 1311 &minfo, sizeof(MODULEINFO))) { 1312 return false; 1313 } 1314 1315 if ((addr >= minfo.lpBaseOfDll) && 1316 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) { 1317 return true; 1318 } else { 1319 return false; 1320 } 1321 } 1322 #endif 1323 1324 struct _modinfo { 1325 address addr; 1326 char* full_path; // point to a char buffer 1327 int buflen; // size of the buffer 1328 address base_addr; 1329 }; 1330 1331 static int _locate_module_by_addr(const char * mod_fname, address base_addr, 1332 address top_address, void * param) { 1333 struct _modinfo *pmod = (struct _modinfo *)param; 1334 if (!pmod) return -1; 1335 1336 if (base_addr <= pmod->addr && 1337 top_address > pmod->addr) { 1338 // if a buffer is provided, copy path name to the buffer 1339 if (pmod->full_path) { 1340 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1341 } 1342 pmod->base_addr = base_addr; 1343 return 1; 1344 } 1345 return 0; 1346 } 1347 1348 bool os::dll_address_to_library_name(address addr, char* buf, 1349 int buflen, int* offset) { 1350 // buf is not optional, but offset is optional 1351 assert(buf != NULL, "sanity check"); 1352 1353 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1354 // return the full path to the DLL file, sometimes it returns path 1355 // to the corresponding PDB file (debug info); sometimes it only 1356 // returns partial path, which makes life painful. 1357 1358 struct _modinfo mi; 1359 mi.addr = addr; 1360 mi.full_path = buf; 1361 mi.buflen = buflen; 1362 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) { 1363 // buf already contains path name 1364 if (offset) *offset = addr - mi.base_addr; 1365 return true; 1366 } 1367 1368 buf[0] = '\0'; 1369 if (offset) *offset = -1; 1370 return false; 1371 } 1372 1373 bool os::dll_address_to_function_name(address addr, char *buf, 1374 int buflen, int *offset, 1375 bool demangle) { 1376 // buf is not optional, but offset is optional 1377 assert(buf != NULL, "sanity check"); 1378 1379 if (Decoder::decode(addr, buf, buflen, offset, demangle)) { 1380 return true; 1381 } 1382 if (offset != NULL) *offset = -1; 1383 buf[0] = '\0'; 1384 return false; 1385 } 1386 1387 // save the start and end address of jvm.dll into param[0] and param[1] 1388 static int _locate_jvm_dll(const char* mod_fname, address base_addr, 1389 address top_address, void * param) { 1390 if (!param) return -1; 1391 1392 if (base_addr <= (address)_locate_jvm_dll && 1393 top_address > (address)_locate_jvm_dll) { 1394 ((address*)param)[0] = base_addr; 1395 ((address*)param)[1] = top_address; 1396 return 1; 1397 } 1398 return 0; 1399 } 1400 1401 address vm_lib_location[2]; // start and end address of jvm.dll 1402 1403 // check if addr is inside jvm.dll 1404 bool os::address_is_in_vm(address addr) { 1405 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1406 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) { 1407 assert(false, "Can't find jvm module."); 1408 return false; 1409 } 1410 } 1411 1412 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1413 } 1414 1415 // print module info; param is outputStream* 1416 static int _print_module(const char* fname, address base_address, 1417 address top_address, void* param) { 1418 if (!param) return -1; 1419 1420 outputStream* st = (outputStream*)param; 1421 1422 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname); 1423 return 0; 1424 } 1425 1426 // Loads .dll/.so and 1427 // in case of error it checks if .dll/.so was built for the 1428 // same architecture as Hotspot is running on 1429 void * os::dll_load(const char *name, char *ebuf, int ebuflen) { 1430 void * result = LoadLibrary(name); 1431 if (result != NULL) { 1432 return result; 1433 } 1434 1435 DWORD errcode = GetLastError(); 1436 if (errcode == ERROR_MOD_NOT_FOUND) { 1437 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1); 1438 ebuf[ebuflen - 1] = '\0'; 1439 return NULL; 1440 } 1441 1442 // Parsing dll below 1443 // If we can read dll-info and find that dll was built 1444 // for an architecture other than Hotspot is running in 1445 // - then print to buffer "DLL was built for a different architecture" 1446 // else call os::lasterror to obtain system error message 1447 1448 // Read system error message into ebuf 1449 // It may or may not be overwritten below (in the for loop and just above) 1450 lasterror(ebuf, (size_t) ebuflen); 1451 ebuf[ebuflen - 1] = '\0'; 1452 int fd = ::open(name, O_RDONLY | O_BINARY, 0); 1453 if (fd < 0) { 1454 return NULL; 1455 } 1456 1457 uint32_t signature_offset; 1458 uint16_t lib_arch = 0; 1459 bool failed_to_get_lib_arch = 1460 ( // Go to position 3c in the dll 1461 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0) 1462 || 1463 // Read location of signature 1464 (sizeof(signature_offset) != 1465 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset)))) 1466 || 1467 // Go to COFF File Header in dll 1468 // that is located after "signature" (4 bytes long) 1469 (os::seek_to_file_offset(fd, 1470 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0) 1471 || 1472 // Read field that contains code of architecture 1473 // that dll was built for 1474 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch)))) 1475 ); 1476 1477 ::close(fd); 1478 if (failed_to_get_lib_arch) { 1479 // file i/o error - report os::lasterror(...) msg 1480 return NULL; 1481 } 1482 1483 typedef struct { 1484 uint16_t arch_code; 1485 char* arch_name; 1486 } arch_t; 1487 1488 static const arch_t arch_array[] = { 1489 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1490 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1491 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1492 }; 1493 #if (defined _M_IA64) 1494 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64; 1495 #elif (defined _M_AMD64) 1496 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64; 1497 #elif (defined _M_IX86) 1498 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386; 1499 #else 1500 #error Method os::dll_load requires that one of following \ 1501 is defined :_M_IA64,_M_AMD64 or _M_IX86 1502 #endif 1503 1504 1505 // Obtain a string for printf operation 1506 // lib_arch_str shall contain string what platform this .dll was built for 1507 // running_arch_str shall string contain what platform Hotspot was built for 1508 char *running_arch_str = NULL, *lib_arch_str = NULL; 1509 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) { 1510 if (lib_arch == arch_array[i].arch_code) { 1511 lib_arch_str = arch_array[i].arch_name; 1512 } 1513 if (running_arch == arch_array[i].arch_code) { 1514 running_arch_str = arch_array[i].arch_name; 1515 } 1516 } 1517 1518 assert(running_arch_str, 1519 "Didn't find running architecture code in arch_array"); 1520 1521 // If the architecture is right 1522 // but some other error took place - report os::lasterror(...) msg 1523 if (lib_arch == running_arch) { 1524 return NULL; 1525 } 1526 1527 if (lib_arch_str != NULL) { 1528 ::_snprintf(ebuf, ebuflen - 1, 1529 "Can't load %s-bit .dll on a %s-bit platform", 1530 lib_arch_str, running_arch_str); 1531 } else { 1532 // don't know what architecture this dll was build for 1533 ::_snprintf(ebuf, ebuflen - 1, 1534 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1535 lib_arch, running_arch_str); 1536 } 1537 1538 return NULL; 1539 } 1540 1541 void os::print_dll_info(outputStream *st) { 1542 st->print_cr("Dynamic libraries:"); 1543 get_loaded_modules_info(_print_module, (void *)st); 1544 } 1545 1546 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1547 HANDLE hProcess; 1548 1549 # define MAX_NUM_MODULES 128 1550 HMODULE modules[MAX_NUM_MODULES]; 1551 static char filename[MAX_PATH]; 1552 int result = 0; 1553 1554 int pid = os::current_process_id(); 1555 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1556 FALSE, pid); 1557 if (hProcess == NULL) return 0; 1558 1559 DWORD size_needed; 1560 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) { 1561 CloseHandle(hProcess); 1562 return 0; 1563 } 1564 1565 // number of modules that are currently loaded 1566 int num_modules = size_needed / sizeof(HMODULE); 1567 1568 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1569 // Get Full pathname: 1570 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) { 1571 filename[0] = '\0'; 1572 } 1573 1574 MODULEINFO modinfo; 1575 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) { 1576 modinfo.lpBaseOfDll = NULL; 1577 modinfo.SizeOfImage = 0; 1578 } 1579 1580 // Invoke callback function 1581 result = callback(filename, (address)modinfo.lpBaseOfDll, 1582 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param); 1583 if (result) break; 1584 } 1585 1586 CloseHandle(hProcess); 1587 return result; 1588 } 1589 1590 bool os::get_host_name(char* buf, size_t buflen) { 1591 DWORD size = (DWORD)buflen; 1592 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE); 1593 } 1594 1595 void os::get_summary_os_info(char* buf, size_t buflen) { 1596 stringStream sst(buf, buflen); 1597 os::win32::print_windows_version(&sst); 1598 // chop off newline character 1599 char* nl = strchr(buf, '\n'); 1600 if (nl != NULL) *nl = '\0'; 1601 } 1602 1603 int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) { 1604 int ret = vsnprintf(buf, len, fmt, args); 1605 // Get the correct buffer size if buf is too small 1606 if (ret < 0) { 1607 return _vscprintf(fmt, args); 1608 } 1609 return ret; 1610 } 1611 1612 static inline time_t get_mtime(const char* filename) { 1613 struct stat st; 1614 int ret = os::stat(filename, &st); 1615 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 1616 return st.st_mtime; 1617 } 1618 1619 int os::compare_file_modified_times(const char* file1, const char* file2) { 1620 time_t t1 = get_mtime(file1); 1621 time_t t2 = get_mtime(file2); 1622 return t1 - t2; 1623 } 1624 1625 void os::print_os_info_brief(outputStream* st) { 1626 os::print_os_info(st); 1627 } 1628 1629 void os::print_os_info(outputStream* st) { 1630 #ifdef ASSERT 1631 char buffer[1024]; 1632 st->print("HostName: "); 1633 if (get_host_name(buffer, sizeof(buffer))) { 1634 st->print("%s ", buffer); 1635 } else { 1636 st->print("N/A "); 1637 } 1638 #endif 1639 st->print("OS:"); 1640 os::win32::print_windows_version(st); 1641 } 1642 1643 void os::win32::print_windows_version(outputStream* st) { 1644 OSVERSIONINFOEX osvi; 1645 VS_FIXEDFILEINFO *file_info; 1646 TCHAR kernel32_path[MAX_PATH]; 1647 UINT len, ret; 1648 1649 // Use the GetVersionEx information to see if we're on a server or 1650 // workstation edition of Windows. Starting with Windows 8.1 we can't 1651 // trust the OS version information returned by this API. 1652 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1653 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1654 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1655 st->print_cr("Call to GetVersionEx failed"); 1656 return; 1657 } 1658 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION); 1659 1660 // Get the full path to \Windows\System32\kernel32.dll and use that for 1661 // determining what version of Windows we're running on. 1662 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1; 1663 ret = GetSystemDirectory(kernel32_path, len); 1664 if (ret == 0 || ret > len) { 1665 st->print_cr("Call to GetSystemDirectory failed"); 1666 return; 1667 } 1668 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret); 1669 1670 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL); 1671 if (version_size == 0) { 1672 st->print_cr("Call to GetFileVersionInfoSize failed"); 1673 return; 1674 } 1675 1676 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal); 1677 if (version_info == NULL) { 1678 st->print_cr("Failed to allocate version_info"); 1679 return; 1680 } 1681 1682 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) { 1683 os::free(version_info); 1684 st->print_cr("Call to GetFileVersionInfo failed"); 1685 return; 1686 } 1687 1688 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) { 1689 os::free(version_info); 1690 st->print_cr("Call to VerQueryValue failed"); 1691 return; 1692 } 1693 1694 int major_version = HIWORD(file_info->dwProductVersionMS); 1695 int minor_version = LOWORD(file_info->dwProductVersionMS); 1696 int build_number = HIWORD(file_info->dwProductVersionLS); 1697 int build_minor = LOWORD(file_info->dwProductVersionLS); 1698 int os_vers = major_version * 1000 + minor_version; 1699 os::free(version_info); 1700 1701 st->print(" Windows "); 1702 switch (os_vers) { 1703 1704 case 6000: 1705 if (is_workstation) { 1706 st->print("Vista"); 1707 } else { 1708 st->print("Server 2008"); 1709 } 1710 break; 1711 1712 case 6001: 1713 if (is_workstation) { 1714 st->print("7"); 1715 } else { 1716 st->print("Server 2008 R2"); 1717 } 1718 break; 1719 1720 case 6002: 1721 if (is_workstation) { 1722 st->print("8"); 1723 } else { 1724 st->print("Server 2012"); 1725 } 1726 break; 1727 1728 case 6003: 1729 if (is_workstation) { 1730 st->print("8.1"); 1731 } else { 1732 st->print("Server 2012 R2"); 1733 } 1734 break; 1735 1736 case 10000: 1737 if (is_workstation) { 1738 st->print("10"); 1739 } else { 1740 st->print("Server 2016"); 1741 } 1742 break; 1743 1744 default: 1745 // Unrecognized windows, print out its major and minor versions 1746 st->print("%d.%d", major_version, minor_version); 1747 break; 1748 } 1749 1750 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1751 // find out whether we are running on 64 bit processor or not 1752 SYSTEM_INFO si; 1753 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1754 GetNativeSystemInfo(&si); 1755 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1756 st->print(" , 64 bit"); 1757 } 1758 1759 st->print(" Build %d", build_number); 1760 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor); 1761 st->cr(); 1762 } 1763 1764 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1765 // Nothing to do for now. 1766 } 1767 1768 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1769 HKEY key; 1770 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE, 1771 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key); 1772 if (status == ERROR_SUCCESS) { 1773 DWORD size = (DWORD)buflen; 1774 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size); 1775 if (status != ERROR_SUCCESS) { 1776 strncpy(buf, "## __CPU__", buflen); 1777 } 1778 RegCloseKey(key); 1779 } else { 1780 // Put generic cpu info to return 1781 strncpy(buf, "## __CPU__", buflen); 1782 } 1783 } 1784 1785 void os::print_memory_info(outputStream* st) { 1786 st->print("Memory:"); 1787 st->print(" %dk page", os::vm_page_size()>>10); 1788 1789 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1790 // value if total memory is larger than 4GB 1791 MEMORYSTATUSEX ms; 1792 ms.dwLength = sizeof(ms); 1793 GlobalMemoryStatusEx(&ms); 1794 1795 st->print(", physical %uk", os::physical_memory() >> 10); 1796 st->print("(%uk free)", os::available_memory() >> 10); 1797 1798 st->print(", swap %uk", ms.ullTotalPageFile >> 10); 1799 st->print("(%uk free)", ms.ullAvailPageFile >> 10); 1800 st->cr(); 1801 } 1802 1803 void os::print_siginfo(outputStream *st, const void* siginfo) { 1804 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo; 1805 st->print("siginfo:"); 1806 1807 char tmp[64]; 1808 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) { 1809 strcpy(tmp, "EXCEPTION_??"); 1810 } 1811 st->print(" %s (0x%x)", tmp, er->ExceptionCode); 1812 1813 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION || 1814 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) && 1815 er->NumberParameters >= 2) { 1816 switch (er->ExceptionInformation[0]) { 1817 case 0: st->print(", reading address"); break; 1818 case 1: st->print(", writing address"); break; 1819 case 8: st->print(", data execution prevention violation at address"); break; 1820 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1821 er->ExceptionInformation[0]); 1822 } 1823 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1824 } else { 1825 int num = er->NumberParameters; 1826 if (num > 0) { 1827 st->print(", ExceptionInformation="); 1828 for (int i = 0; i < num; i++) { 1829 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1830 } 1831 } 1832 } 1833 st->cr(); 1834 } 1835 1836 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1837 // do nothing 1838 } 1839 1840 static char saved_jvm_path[MAX_PATH] = {0}; 1841 1842 // Find the full path to the current module, jvm.dll 1843 void os::jvm_path(char *buf, jint buflen) { 1844 // Error checking. 1845 if (buflen < MAX_PATH) { 1846 assert(false, "must use a large-enough buffer"); 1847 buf[0] = '\0'; 1848 return; 1849 } 1850 // Lazy resolve the path to current module. 1851 if (saved_jvm_path[0] != 0) { 1852 strcpy(buf, saved_jvm_path); 1853 return; 1854 } 1855 1856 buf[0] = '\0'; 1857 if (Arguments::sun_java_launcher_is_altjvm()) { 1858 // Support for the java launcher's '-XXaltjvm=<path>' option. Check 1859 // for a JAVA_HOME environment variable and fix up the path so it 1860 // looks like jvm.dll is installed there (append a fake suffix 1861 // hotspot/jvm.dll). 1862 char* java_home_var = ::getenv("JAVA_HOME"); 1863 if (java_home_var != NULL && java_home_var[0] != 0 && 1864 strlen(java_home_var) < (size_t)buflen) { 1865 strncpy(buf, java_home_var, buflen); 1866 1867 // determine if this is a legacy image or modules image 1868 // modules image doesn't have "jre" subdirectory 1869 size_t len = strlen(buf); 1870 char* jrebin_p = buf + len; 1871 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1872 if (0 != _access(buf, 0)) { 1873 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1874 } 1875 len = strlen(buf); 1876 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1877 } 1878 } 1879 1880 if (buf[0] == '\0') { 1881 GetModuleFileName(vm_lib_handle, buf, buflen); 1882 } 1883 strncpy(saved_jvm_path, buf, MAX_PATH); 1884 saved_jvm_path[MAX_PATH - 1] = '\0'; 1885 } 1886 1887 1888 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1889 #ifndef _WIN64 1890 st->print("_"); 1891 #endif 1892 } 1893 1894 1895 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1896 #ifndef _WIN64 1897 st->print("@%d", args_size * sizeof(int)); 1898 #endif 1899 } 1900 1901 // This method is a copy of JDK's sysGetLastErrorString 1902 // from src/windows/hpi/src/system_md.c 1903 1904 size_t os::lasterror(char* buf, size_t len) { 1905 DWORD errval; 1906 1907 if ((errval = GetLastError()) != 0) { 1908 // DOS error 1909 size_t n = (size_t)FormatMessage( 1910 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1911 NULL, 1912 errval, 1913 0, 1914 buf, 1915 (DWORD)len, 1916 NULL); 1917 if (n > 3) { 1918 // Drop final '.', CR, LF 1919 if (buf[n - 1] == '\n') n--; 1920 if (buf[n - 1] == '\r') n--; 1921 if (buf[n - 1] == '.') n--; 1922 buf[n] = '\0'; 1923 } 1924 return n; 1925 } 1926 1927 if (errno != 0) { 1928 // C runtime error that has no corresponding DOS error code 1929 const char* s = os::strerror(errno); 1930 size_t n = strlen(s); 1931 if (n >= len) n = len - 1; 1932 strncpy(buf, s, n); 1933 buf[n] = '\0'; 1934 return n; 1935 } 1936 1937 return 0; 1938 } 1939 1940 int os::get_last_error() { 1941 DWORD error = GetLastError(); 1942 if (error == 0) { 1943 error = errno; 1944 } 1945 return (int)error; 1946 } 1947 1948 WindowsSemaphore::WindowsSemaphore(uint value) { 1949 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL); 1950 1951 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError()); 1952 } 1953 1954 WindowsSemaphore::~WindowsSemaphore() { 1955 ::CloseHandle(_semaphore); 1956 } 1957 1958 void WindowsSemaphore::signal(uint count) { 1959 if (count > 0) { 1960 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL); 1961 1962 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError()); 1963 } 1964 } 1965 1966 void WindowsSemaphore::wait() { 1967 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE); 1968 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError()); 1969 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret); 1970 } 1971 1972 // sun.misc.Signal 1973 // NOTE that this is a workaround for an apparent kernel bug where if 1974 // a signal handler for SIGBREAK is installed then that signal handler 1975 // takes priority over the console control handler for CTRL_CLOSE_EVENT. 1976 // See bug 4416763. 1977 static void (*sigbreakHandler)(int) = NULL; 1978 1979 static void UserHandler(int sig, void *siginfo, void *context) { 1980 os::signal_notify(sig); 1981 // We need to reinstate the signal handler each time... 1982 os::signal(sig, (void*)UserHandler); 1983 } 1984 1985 void* os::user_handler() { 1986 return (void*) UserHandler; 1987 } 1988 1989 void* os::signal(int signal_number, void* handler) { 1990 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1991 void (*oldHandler)(int) = sigbreakHandler; 1992 sigbreakHandler = (void (*)(int)) handler; 1993 return (void*) oldHandler; 1994 } else { 1995 return (void*)::signal(signal_number, (void (*)(int))handler); 1996 } 1997 } 1998 1999 void os::signal_raise(int signal_number) { 2000 raise(signal_number); 2001 } 2002 2003 // The Win32 C runtime library maps all console control events other than ^C 2004 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 2005 // logoff, and shutdown events. We therefore install our own console handler 2006 // that raises SIGTERM for the latter cases. 2007 // 2008 static BOOL WINAPI consoleHandler(DWORD event) { 2009 switch (event) { 2010 case CTRL_C_EVENT: 2011 if (is_error_reported()) { 2012 // Ctrl-C is pressed during error reporting, likely because the error 2013 // handler fails to abort. Let VM die immediately. 2014 os::die(); 2015 } 2016 2017 os::signal_raise(SIGINT); 2018 return TRUE; 2019 break; 2020 case CTRL_BREAK_EVENT: 2021 if (sigbreakHandler != NULL) { 2022 (*sigbreakHandler)(SIGBREAK); 2023 } 2024 return TRUE; 2025 break; 2026 case CTRL_LOGOFF_EVENT: { 2027 // Don't terminate JVM if it is running in a non-interactive session, 2028 // such as a service process. 2029 USEROBJECTFLAGS flags; 2030 HANDLE handle = GetProcessWindowStation(); 2031 if (handle != NULL && 2032 GetUserObjectInformation(handle, UOI_FLAGS, &flags, 2033 sizeof(USEROBJECTFLAGS), NULL)) { 2034 // If it is a non-interactive session, let next handler to deal 2035 // with it. 2036 if ((flags.dwFlags & WSF_VISIBLE) == 0) { 2037 return FALSE; 2038 } 2039 } 2040 } 2041 case CTRL_CLOSE_EVENT: 2042 case CTRL_SHUTDOWN_EVENT: 2043 os::signal_raise(SIGTERM); 2044 return TRUE; 2045 break; 2046 default: 2047 break; 2048 } 2049 return FALSE; 2050 } 2051 2052 // The following code is moved from os.cpp for making this 2053 // code platform specific, which it is by its very nature. 2054 2055 // Return maximum OS signal used + 1 for internal use only 2056 // Used as exit signal for signal_thread 2057 int os::sigexitnum_pd() { 2058 return NSIG; 2059 } 2060 2061 // a counter for each possible signal value, including signal_thread exit signal 2062 static volatile jint pending_signals[NSIG+1] = { 0 }; 2063 static HANDLE sig_sem = NULL; 2064 2065 void os::signal_init_pd() { 2066 // Initialize signal structures 2067 memset((void*)pending_signals, 0, sizeof(pending_signals)); 2068 2069 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 2070 2071 // Programs embedding the VM do not want it to attempt to receive 2072 // events like CTRL_LOGOFF_EVENT, which are used to implement the 2073 // shutdown hooks mechanism introduced in 1.3. For example, when 2074 // the VM is run as part of a Windows NT service (i.e., a servlet 2075 // engine in a web server), the correct behavior is for any console 2076 // control handler to return FALSE, not TRUE, because the OS's 2077 // "final" handler for such events allows the process to continue if 2078 // it is a service (while terminating it if it is not a service). 2079 // To make this behavior uniform and the mechanism simpler, we 2080 // completely disable the VM's usage of these console events if -Xrs 2081 // (=ReduceSignalUsage) is specified. This means, for example, that 2082 // the CTRL-BREAK thread dump mechanism is also disabled in this 2083 // case. See bugs 4323062, 4345157, and related bugs. 2084 2085 if (!ReduceSignalUsage) { 2086 // Add a CTRL-C handler 2087 SetConsoleCtrlHandler(consoleHandler, TRUE); 2088 } 2089 } 2090 2091 void os::signal_notify(int signal_number) { 2092 BOOL ret; 2093 if (sig_sem != NULL) { 2094 Atomic::inc(&pending_signals[signal_number]); 2095 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2096 assert(ret != 0, "ReleaseSemaphore() failed"); 2097 } 2098 } 2099 2100 static int check_pending_signals(bool wait_for_signal) { 2101 DWORD ret; 2102 while (true) { 2103 for (int i = 0; i < NSIG + 1; i++) { 2104 jint n = pending_signals[i]; 2105 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2106 return i; 2107 } 2108 } 2109 if (!wait_for_signal) { 2110 return -1; 2111 } 2112 2113 JavaThread *thread = JavaThread::current(); 2114 2115 ThreadBlockInVM tbivm(thread); 2116 2117 bool threadIsSuspended; 2118 do { 2119 thread->set_suspend_equivalent(); 2120 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2121 ret = ::WaitForSingleObject(sig_sem, INFINITE); 2122 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 2123 2124 // were we externally suspended while we were waiting? 2125 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2126 if (threadIsSuspended) { 2127 // The semaphore has been incremented, but while we were waiting 2128 // another thread suspended us. We don't want to continue running 2129 // while suspended because that would surprise the thread that 2130 // suspended us. 2131 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2132 assert(ret != 0, "ReleaseSemaphore() failed"); 2133 2134 thread->java_suspend_self(); 2135 } 2136 } while (threadIsSuspended); 2137 } 2138 } 2139 2140 int os::signal_lookup() { 2141 return check_pending_signals(false); 2142 } 2143 2144 int os::signal_wait() { 2145 return check_pending_signals(true); 2146 } 2147 2148 // Implicit OS exception handling 2149 2150 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, 2151 address handler) { 2152 JavaThread* thread = (JavaThread*) Thread::current_or_null(); 2153 // Save pc in thread 2154 #ifdef _M_IA64 2155 // Do not blow up if no thread info available. 2156 if (thread) { 2157 // Saving PRECISE pc (with slot information) in thread. 2158 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress; 2159 // Convert precise PC into "Unix" format 2160 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2); 2161 thread->set_saved_exception_pc((address)precise_pc); 2162 } 2163 // Set pc to handler 2164 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 2165 // Clear out psr.ri (= Restart Instruction) in order to continue 2166 // at the beginning of the target bundle. 2167 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF; 2168 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!"); 2169 #else 2170 #ifdef _M_AMD64 2171 // Do not blow up if no thread info available. 2172 if (thread) { 2173 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip); 2174 } 2175 // Set pc to handler 2176 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 2177 #else 2178 // Do not blow up if no thread info available. 2179 if (thread) { 2180 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip); 2181 } 2182 // Set pc to handler 2183 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler; 2184 #endif 2185 #endif 2186 2187 // Continue the execution 2188 return EXCEPTION_CONTINUE_EXECUTION; 2189 } 2190 2191 2192 // Used for PostMortemDump 2193 extern "C" void safepoints(); 2194 extern "C" void find(int x); 2195 extern "C" void events(); 2196 2197 // According to Windows API documentation, an illegal instruction sequence should generate 2198 // the 0xC000001C exception code. However, real world experience shows that occasionnaly 2199 // the execution of an illegal instruction can generate the exception code 0xC000001E. This 2200 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 2201 2202 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 2203 2204 // From "Execution Protection in the Windows Operating System" draft 0.35 2205 // Once a system header becomes available, the "real" define should be 2206 // included or copied here. 2207 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2208 2209 // Handle NAT Bit consumption on IA64. 2210 #ifdef _M_IA64 2211 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION 2212 #endif 2213 2214 // Windows Vista/2008 heap corruption check 2215 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374 2216 2217 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual 2218 // C++ compiler contain this error code. Because this is a compiler-generated 2219 // error, the code is not listed in the Win32 API header files. 2220 // The code is actually a cryptic mnemonic device, with the initial "E" 2221 // standing for "exception" and the final 3 bytes (0x6D7363) representing the 2222 // ASCII values of "msc". 2223 2224 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363 2225 2226 #define def_excpt(val) { #val, (val) } 2227 2228 static const struct { char* name; uint number; } exceptlabels[] = { 2229 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2230 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2231 def_excpt(EXCEPTION_BREAKPOINT), 2232 def_excpt(EXCEPTION_SINGLE_STEP), 2233 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2234 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2235 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2236 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2237 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2238 def_excpt(EXCEPTION_FLT_OVERFLOW), 2239 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2240 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2241 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2242 def_excpt(EXCEPTION_INT_OVERFLOW), 2243 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2244 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2245 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2246 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2247 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2248 def_excpt(EXCEPTION_STACK_OVERFLOW), 2249 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2250 def_excpt(EXCEPTION_GUARD_PAGE), 2251 def_excpt(EXCEPTION_INVALID_HANDLE), 2252 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION), 2253 def_excpt(EXCEPTION_HEAP_CORRUPTION) 2254 #ifdef _M_IA64 2255 , def_excpt(EXCEPTION_REG_NAT_CONSUMPTION) 2256 #endif 2257 }; 2258 2259 #undef def_excpt 2260 2261 const char* os::exception_name(int exception_code, char *buf, size_t size) { 2262 uint code = static_cast<uint>(exception_code); 2263 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) { 2264 if (exceptlabels[i].number == code) { 2265 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2266 return buf; 2267 } 2268 } 2269 2270 return NULL; 2271 } 2272 2273 //----------------------------------------------------------------------------- 2274 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2275 // handle exception caused by idiv; should only happen for -MinInt/-1 2276 // (division by zero is handled explicitly) 2277 #ifdef _M_IA64 2278 assert(0, "Fix Handle_IDiv_Exception"); 2279 #else 2280 #ifdef _M_AMD64 2281 PCONTEXT ctx = exceptionInfo->ContextRecord; 2282 address pc = (address)ctx->Rip; 2283 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode"); 2284 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2285 if (pc[0] == 0xF7) { 2286 // set correct result values and continue after idiv instruction 2287 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes 2288 } else { 2289 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes 2290 } 2291 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation) 2292 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the 2293 // idiv opcode (0xF7). 2294 ctx->Rdx = (DWORD)0; // remainder 2295 // Continue the execution 2296 #else 2297 PCONTEXT ctx = exceptionInfo->ContextRecord; 2298 address pc = (address)ctx->Eip; 2299 assert(pc[0] == 0xF7, "not an idiv opcode"); 2300 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2301 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2302 // set correct result values and continue after idiv instruction 2303 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2304 ctx->Eax = (DWORD)min_jint; // result 2305 ctx->Edx = (DWORD)0; // remainder 2306 // Continue the execution 2307 #endif 2308 #endif 2309 return EXCEPTION_CONTINUE_EXECUTION; 2310 } 2311 2312 //----------------------------------------------------------------------------- 2313 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2314 PCONTEXT ctx = exceptionInfo->ContextRecord; 2315 #ifndef _WIN64 2316 // handle exception caused by native method modifying control word 2317 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2318 2319 switch (exception_code) { 2320 case EXCEPTION_FLT_DENORMAL_OPERAND: 2321 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2322 case EXCEPTION_FLT_INEXACT_RESULT: 2323 case EXCEPTION_FLT_INVALID_OPERATION: 2324 case EXCEPTION_FLT_OVERFLOW: 2325 case EXCEPTION_FLT_STACK_CHECK: 2326 case EXCEPTION_FLT_UNDERFLOW: 2327 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2328 if (fp_control_word != ctx->FloatSave.ControlWord) { 2329 // Restore FPCW and mask out FLT exceptions 2330 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2331 // Mask out pending FLT exceptions 2332 ctx->FloatSave.StatusWord &= 0xffffff00; 2333 return EXCEPTION_CONTINUE_EXECUTION; 2334 } 2335 } 2336 2337 if (prev_uef_handler != NULL) { 2338 // We didn't handle this exception so pass it to the previous 2339 // UnhandledExceptionFilter. 2340 return (prev_uef_handler)(exceptionInfo); 2341 } 2342 #else // !_WIN64 2343 // On Windows, the mxcsr control bits are non-volatile across calls 2344 // See also CR 6192333 2345 // 2346 jint MxCsr = INITIAL_MXCSR; 2347 // we can't use StubRoutines::addr_mxcsr_std() 2348 // because in Win64 mxcsr is not saved there 2349 if (MxCsr != ctx->MxCsr) { 2350 ctx->MxCsr = MxCsr; 2351 return EXCEPTION_CONTINUE_EXECUTION; 2352 } 2353 #endif // !_WIN64 2354 2355 return EXCEPTION_CONTINUE_SEARCH; 2356 } 2357 2358 static inline void report_error(Thread* t, DWORD exception_code, 2359 address addr, void* siginfo, void* context) { 2360 VMError::report_and_die(t, exception_code, addr, siginfo, context); 2361 2362 // If UseOsErrorReporting, this will return here and save the error file 2363 // somewhere where we can find it in the minidump. 2364 } 2365 2366 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread, 2367 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) { 2368 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2369 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2370 if (Interpreter::contains(pc)) { 2371 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord); 2372 if (!fr->is_first_java_frame()) { 2373 assert(fr->safe_for_sender(thread), "Safety check"); 2374 *fr = fr->java_sender(); 2375 } 2376 } else { 2377 // more complex code with compiled code 2378 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above"); 2379 CodeBlob* cb = CodeCache::find_blob(pc); 2380 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) { 2381 // Not sure where the pc points to, fallback to default 2382 // stack overflow handling 2383 return false; 2384 } else { 2385 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord); 2386 // in compiled code, the stack banging is performed just after the return pc 2387 // has been pushed on the stack 2388 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp())); 2389 if (!fr->is_java_frame()) { 2390 assert(fr->safe_for_sender(thread), "Safety check"); 2391 *fr = fr->java_sender(); 2392 } 2393 } 2394 } 2395 assert(fr->is_java_frame(), "Safety check"); 2396 return true; 2397 } 2398 2399 //----------------------------------------------------------------------------- 2400 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2401 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2402 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2403 #ifdef _M_IA64 2404 // On Itanium, we need the "precise pc", which has the slot number coded 2405 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format). 2406 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress; 2407 // Convert the pc to "Unix format", which has the slot number coded 2408 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2 2409 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction" 2410 // information is saved in the Unix format. 2411 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2)); 2412 #else 2413 #ifdef _M_AMD64 2414 address pc = (address) exceptionInfo->ContextRecord->Rip; 2415 #else 2416 address pc = (address) exceptionInfo->ContextRecord->Eip; 2417 #endif 2418 #endif 2419 Thread* t = Thread::current_or_null_safe(); 2420 2421 // Handle SafeFetch32 and SafeFetchN exceptions. 2422 if (StubRoutines::is_safefetch_fault(pc)) { 2423 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc)); 2424 } 2425 2426 #ifndef _WIN64 2427 // Execution protection violation - win32 running on AMD64 only 2428 // Handled first to avoid misdiagnosis as a "normal" access violation; 2429 // This is safe to do because we have a new/unique ExceptionInformation 2430 // code for this condition. 2431 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2432 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2433 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2434 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2435 2436 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2437 int page_size = os::vm_page_size(); 2438 2439 // Make sure the pc and the faulting address are sane. 2440 // 2441 // If an instruction spans a page boundary, and the page containing 2442 // the beginning of the instruction is executable but the following 2443 // page is not, the pc and the faulting address might be slightly 2444 // different - we still want to unguard the 2nd page in this case. 2445 // 2446 // 15 bytes seems to be a (very) safe value for max instruction size. 2447 bool pc_is_near_addr = 2448 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2449 bool instr_spans_page_boundary = 2450 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2451 (intptr_t) page_size) > 0); 2452 2453 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2454 static volatile address last_addr = 2455 (address) os::non_memory_address_word(); 2456 2457 // In conservative mode, don't unguard unless the address is in the VM 2458 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2459 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2460 2461 // Set memory to RWX and retry 2462 address page_start = 2463 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2464 bool res = os::protect_memory((char*) page_start, page_size, 2465 os::MEM_PROT_RWX); 2466 2467 log_debug(os)("Execution protection violation " 2468 "at " INTPTR_FORMAT 2469 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr), 2470 p2i(page_start), (res ? "success" : os::strerror(errno))); 2471 2472 // Set last_addr so if we fault again at the same address, we don't 2473 // end up in an endless loop. 2474 // 2475 // There are two potential complications here. Two threads trapping 2476 // at the same address at the same time could cause one of the 2477 // threads to think it already unguarded, and abort the VM. Likely 2478 // very rare. 2479 // 2480 // The other race involves two threads alternately trapping at 2481 // different addresses and failing to unguard the page, resulting in 2482 // an endless loop. This condition is probably even more unlikely 2483 // than the first. 2484 // 2485 // Although both cases could be avoided by using locks or thread 2486 // local last_addr, these solutions are unnecessary complication: 2487 // this handler is a best-effort safety net, not a complete solution. 2488 // It is disabled by default and should only be used as a workaround 2489 // in case we missed any no-execute-unsafe VM code. 2490 2491 last_addr = addr; 2492 2493 return EXCEPTION_CONTINUE_EXECUTION; 2494 } 2495 } 2496 2497 // Last unguard failed or not unguarding 2498 tty->print_raw_cr("Execution protection violation"); 2499 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2500 exceptionInfo->ContextRecord); 2501 return EXCEPTION_CONTINUE_SEARCH; 2502 } 2503 } 2504 #endif // _WIN64 2505 2506 // Check to see if we caught the safepoint code in the 2507 // process of write protecting the memory serialization page. 2508 // It write enables the page immediately after protecting it 2509 // so just return. 2510 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2511 JavaThread* thread = (JavaThread*) t; 2512 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2513 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2514 if (os::is_memory_serialize_page(thread, addr)) { 2515 // Block current thread until the memory serialize page permission restored. 2516 os::block_on_serialize_page_trap(); 2517 return EXCEPTION_CONTINUE_EXECUTION; 2518 } 2519 } 2520 2521 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) && 2522 VM_Version::is_cpuinfo_segv_addr(pc)) { 2523 // Verify that OS save/restore AVX registers. 2524 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr()); 2525 } 2526 2527 if (t != NULL && t->is_Java_thread()) { 2528 JavaThread* thread = (JavaThread*) t; 2529 bool in_java = thread->thread_state() == _thread_in_Java; 2530 2531 // Handle potential stack overflows up front. 2532 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2533 #ifdef _M_IA64 2534 // Use guard page for register stack. 2535 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2536 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2537 // Check for a register stack overflow on Itanium 2538 if (thread->addr_inside_register_stack_red_zone(addr)) { 2539 // Fatal red zone violation happens if the Java program 2540 // catches a StackOverflow error and does so much processing 2541 // that it runs beyond the unprotected yellow guard zone. As 2542 // a result, we are out of here. 2543 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit."); 2544 } else if(thread->addr_inside_register_stack(addr)) { 2545 // Disable the yellow zone which sets the state that 2546 // we've got a stack overflow problem. 2547 if (thread->stack_yellow_reserved_zone_enabled()) { 2548 thread->disable_stack_yellow_reserved_zone(); 2549 } 2550 // Give us some room to process the exception. 2551 thread->disable_register_stack_guard(); 2552 // Tracing with +Verbose. 2553 if (Verbose) { 2554 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc); 2555 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr); 2556 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base()); 2557 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]", 2558 thread->register_stack_base(), 2559 thread->register_stack_base() + thread->stack_size()); 2560 } 2561 2562 // Reguard the permanent register stack red zone just to be sure. 2563 // We saw Windows silently disabling this without telling us. 2564 thread->enable_register_stack_red_zone(); 2565 2566 return Handle_Exception(exceptionInfo, 2567 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2568 } 2569 #endif 2570 if (thread->stack_guards_enabled()) { 2571 if (_thread_in_Java) { 2572 frame fr; 2573 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2574 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2575 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) { 2576 assert(fr.is_java_frame(), "Must be a Java frame"); 2577 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr); 2578 } 2579 } 2580 // Yellow zone violation. The o/s has unprotected the first yellow 2581 // zone page for us. Note: must call disable_stack_yellow_zone to 2582 // update the enabled status, even if the zone contains only one page. 2583 thread->disable_stack_yellow_reserved_zone(); 2584 // If not in java code, return and hope for the best. 2585 return in_java 2586 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2587 : EXCEPTION_CONTINUE_EXECUTION; 2588 } else { 2589 // Fatal red zone violation. 2590 thread->disable_stack_red_zone(); 2591 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2592 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2593 exceptionInfo->ContextRecord); 2594 return EXCEPTION_CONTINUE_SEARCH; 2595 } 2596 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2597 // Either stack overflow or null pointer exception. 2598 if (in_java) { 2599 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2600 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2601 address stack_end = thread->stack_end(); 2602 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2603 // Stack overflow. 2604 assert(!os::uses_stack_guard_pages(), 2605 "should be caught by red zone code above."); 2606 return Handle_Exception(exceptionInfo, 2607 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2608 } 2609 // Check for safepoint polling and implicit null 2610 // We only expect null pointers in the stubs (vtable) 2611 // the rest are checked explicitly now. 2612 CodeBlob* cb = CodeCache::find_blob(pc); 2613 if (cb != NULL) { 2614 if (os::is_poll_address(addr)) { 2615 address stub = SharedRuntime::get_poll_stub(pc); 2616 return Handle_Exception(exceptionInfo, stub); 2617 } 2618 } 2619 { 2620 #ifdef _WIN64 2621 // If it's a legal stack address map the entire region in 2622 // 2623 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2624 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2625 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) { 2626 addr = (address)((uintptr_t)addr & 2627 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2628 os::commit_memory((char *)addr, thread->stack_base() - addr, 2629 !ExecMem); 2630 return EXCEPTION_CONTINUE_EXECUTION; 2631 } else 2632 #endif 2633 { 2634 // Null pointer exception. 2635 #ifdef _M_IA64 2636 // Process implicit null checks in compiled code. Note: Implicit null checks 2637 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs. 2638 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) { 2639 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format); 2640 // Handle implicit null check in UEP method entry 2641 if (cb && (cb->is_frame_complete_at(pc) || 2642 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) { 2643 if (Verbose) { 2644 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0); 2645 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format); 2646 tty->print_cr(" to addr " INTPTR_FORMAT, addr); 2647 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)", 2648 *(bundle_start + 1), *bundle_start); 2649 } 2650 return Handle_Exception(exceptionInfo, 2651 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL)); 2652 } 2653 } 2654 2655 // Implicit null checks were processed above. Hence, we should not reach 2656 // here in the usual case => die! 2657 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception"); 2658 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2659 exceptionInfo->ContextRecord); 2660 return EXCEPTION_CONTINUE_SEARCH; 2661 2662 #else // !IA64 2663 2664 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr)) { 2665 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2666 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2667 } 2668 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2669 exceptionInfo->ContextRecord); 2670 return EXCEPTION_CONTINUE_SEARCH; 2671 #endif 2672 } 2673 } 2674 } 2675 2676 #ifdef _WIN64 2677 // Special care for fast JNI field accessors. 2678 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2679 // in and the heap gets shrunk before the field access. 2680 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2681 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2682 if (addr != (address)-1) { 2683 return Handle_Exception(exceptionInfo, addr); 2684 } 2685 } 2686 #endif 2687 2688 // Stack overflow or null pointer exception in native code. 2689 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2690 exceptionInfo->ContextRecord); 2691 return EXCEPTION_CONTINUE_SEARCH; 2692 } // /EXCEPTION_ACCESS_VIOLATION 2693 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2694 #if defined _M_IA64 2695 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION || 2696 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) { 2697 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0); 2698 2699 // Compiled method patched to be non entrant? Following conditions must apply: 2700 // 1. must be first instruction in bundle 2701 // 2. must be a break instruction with appropriate code 2702 if ((((uint64_t) pc & 0x0F) == 0) && 2703 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) { 2704 return Handle_Exception(exceptionInfo, 2705 (address)SharedRuntime::get_handle_wrong_method_stub()); 2706 } 2707 } // /EXCEPTION_ILLEGAL_INSTRUCTION 2708 #endif 2709 2710 2711 if (in_java) { 2712 switch (exception_code) { 2713 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2714 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2715 2716 case EXCEPTION_INT_OVERFLOW: 2717 return Handle_IDiv_Exception(exceptionInfo); 2718 2719 } // switch 2720 } 2721 if (((thread->thread_state() == _thread_in_Java) || 2722 (thread->thread_state() == _thread_in_native)) && 2723 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) { 2724 LONG result=Handle_FLT_Exception(exceptionInfo); 2725 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2726 } 2727 } 2728 2729 if (exception_code != EXCEPTION_BREAKPOINT) { 2730 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2731 exceptionInfo->ContextRecord); 2732 } 2733 return EXCEPTION_CONTINUE_SEARCH; 2734 } 2735 2736 #ifndef _WIN64 2737 // Special care for fast JNI accessors. 2738 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2739 // the heap gets shrunk before the field access. 2740 // Need to install our own structured exception handler since native code may 2741 // install its own. 2742 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2743 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2744 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2745 address pc = (address) exceptionInfo->ContextRecord->Eip; 2746 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2747 if (addr != (address)-1) { 2748 return Handle_Exception(exceptionInfo, addr); 2749 } 2750 } 2751 return EXCEPTION_CONTINUE_SEARCH; 2752 } 2753 2754 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \ 2755 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \ 2756 jobject obj, \ 2757 jfieldID fieldID) { \ 2758 __try { \ 2759 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \ 2760 obj, \ 2761 fieldID); \ 2762 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \ 2763 _exception_info())) { \ 2764 } \ 2765 return 0; \ 2766 } 2767 2768 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2769 DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2770 DEFINE_FAST_GETFIELD(jchar, char, Char) 2771 DEFINE_FAST_GETFIELD(jshort, short, Short) 2772 DEFINE_FAST_GETFIELD(jint, int, Int) 2773 DEFINE_FAST_GETFIELD(jlong, long, Long) 2774 DEFINE_FAST_GETFIELD(jfloat, float, Float) 2775 DEFINE_FAST_GETFIELD(jdouble, double, Double) 2776 2777 address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2778 switch (type) { 2779 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2780 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2781 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2782 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2783 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2784 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2785 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2786 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2787 default: ShouldNotReachHere(); 2788 } 2789 return (address)-1; 2790 } 2791 #endif 2792 2793 // Virtual Memory 2794 2795 int os::vm_page_size() { return os::win32::vm_page_size(); } 2796 int os::vm_allocation_granularity() { 2797 return os::win32::vm_allocation_granularity(); 2798 } 2799 2800 // Windows large page support is available on Windows 2003. In order to use 2801 // large page memory, the administrator must first assign additional privilege 2802 // to the user: 2803 // + select Control Panel -> Administrative Tools -> Local Security Policy 2804 // + select Local Policies -> User Rights Assignment 2805 // + double click "Lock pages in memory", add users and/or groups 2806 // + reboot 2807 // Note the above steps are needed for administrator as well, as administrators 2808 // by default do not have the privilege to lock pages in memory. 2809 // 2810 // Note about Windows 2003: although the API supports committing large page 2811 // memory on a page-by-page basis and VirtualAlloc() returns success under this 2812 // scenario, I found through experiment it only uses large page if the entire 2813 // memory region is reserved and committed in a single VirtualAlloc() call. 2814 // This makes Windows large page support more or less like Solaris ISM, in 2815 // that the entire heap must be committed upfront. This probably will change 2816 // in the future, if so the code below needs to be revisited. 2817 2818 #ifndef MEM_LARGE_PAGES 2819 #define MEM_LARGE_PAGES 0x20000000 2820 #endif 2821 2822 static HANDLE _hProcess; 2823 static HANDLE _hToken; 2824 2825 // Container for NUMA node list info 2826 class NUMANodeListHolder { 2827 private: 2828 int *_numa_used_node_list; // allocated below 2829 int _numa_used_node_count; 2830 2831 void free_node_list() { 2832 if (_numa_used_node_list != NULL) { 2833 FREE_C_HEAP_ARRAY(int, _numa_used_node_list); 2834 } 2835 } 2836 2837 public: 2838 NUMANodeListHolder() { 2839 _numa_used_node_count = 0; 2840 _numa_used_node_list = NULL; 2841 // do rest of initialization in build routine (after function pointers are set up) 2842 } 2843 2844 ~NUMANodeListHolder() { 2845 free_node_list(); 2846 } 2847 2848 bool build() { 2849 DWORD_PTR proc_aff_mask; 2850 DWORD_PTR sys_aff_mask; 2851 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false; 2852 ULONG highest_node_number; 2853 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false; 2854 free_node_list(); 2855 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal); 2856 for (unsigned int i = 0; i <= highest_node_number; i++) { 2857 ULONGLONG proc_mask_numa_node; 2858 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false; 2859 if ((proc_aff_mask & proc_mask_numa_node)!=0) { 2860 _numa_used_node_list[_numa_used_node_count++] = i; 2861 } 2862 } 2863 return (_numa_used_node_count > 1); 2864 } 2865 2866 int get_count() { return _numa_used_node_count; } 2867 int get_node_list_entry(int n) { 2868 // for indexes out of range, returns -1 2869 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1); 2870 } 2871 2872 } numa_node_list_holder; 2873 2874 2875 2876 static size_t _large_page_size = 0; 2877 2878 static bool request_lock_memory_privilege() { 2879 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2880 os::current_process_id()); 2881 2882 LUID luid; 2883 if (_hProcess != NULL && 2884 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2885 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2886 2887 TOKEN_PRIVILEGES tp; 2888 tp.PrivilegeCount = 1; 2889 tp.Privileges[0].Luid = luid; 2890 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2891 2892 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2893 // privilege. Check GetLastError() too. See MSDN document. 2894 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2895 (GetLastError() == ERROR_SUCCESS)) { 2896 return true; 2897 } 2898 } 2899 2900 return false; 2901 } 2902 2903 static void cleanup_after_large_page_init() { 2904 if (_hProcess) CloseHandle(_hProcess); 2905 _hProcess = NULL; 2906 if (_hToken) CloseHandle(_hToken); 2907 _hToken = NULL; 2908 } 2909 2910 static bool numa_interleaving_init() { 2911 bool success = false; 2912 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving); 2913 2914 // print a warning if UseNUMAInterleaving flag is specified on command line 2915 bool warn_on_failure = use_numa_interleaving_specified; 2916 #define WARN(msg) if (warn_on_failure) { warning(msg); } 2917 2918 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages) 2919 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2920 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity); 2921 2922 if (numa_node_list_holder.build()) { 2923 if (log_is_enabled(Debug, os, cpu)) { 2924 Log(os, cpu) log; 2925 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count()); 2926 for (int i = 0; i < numa_node_list_holder.get_count(); i++) { 2927 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i)); 2928 } 2929 } 2930 success = true; 2931 } else { 2932 WARN("Process does not cover multiple NUMA nodes."); 2933 } 2934 if (!success) { 2935 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag."); 2936 } 2937 return success; 2938 #undef WARN 2939 } 2940 2941 // this routine is used whenever we need to reserve a contiguous VA range 2942 // but we need to make separate VirtualAlloc calls for each piece of the range 2943 // Reasons for doing this: 2944 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise) 2945 // * UseNUMAInterleaving requires a separate node for each piece 2946 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, 2947 DWORD prot, 2948 bool should_inject_error = false) { 2949 char * p_buf; 2950 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size 2951 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2952 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size; 2953 2954 // first reserve enough address space in advance since we want to be 2955 // able to break a single contiguous virtual address range into multiple 2956 // large page commits but WS2003 does not allow reserving large page space 2957 // so we just use 4K pages for reserve, this gives us a legal contiguous 2958 // address space. then we will deallocate that reservation, and re alloc 2959 // using large pages 2960 const size_t size_of_reserve = bytes + chunk_size; 2961 if (bytes > size_of_reserve) { 2962 // Overflowed. 2963 return NULL; 2964 } 2965 p_buf = (char *) VirtualAlloc(addr, 2966 size_of_reserve, // size of Reserve 2967 MEM_RESERVE, 2968 PAGE_READWRITE); 2969 // If reservation failed, return NULL 2970 if (p_buf == NULL) return NULL; 2971 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC); 2972 os::release_memory(p_buf, bytes + chunk_size); 2973 2974 // we still need to round up to a page boundary (in case we are using large pages) 2975 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size) 2976 // instead we handle this in the bytes_to_rq computation below 2977 p_buf = (char *) align_size_up((size_t)p_buf, page_size); 2978 2979 // now go through and allocate one chunk at a time until all bytes are 2980 // allocated 2981 size_t bytes_remaining = bytes; 2982 // An overflow of align_size_up() would have been caught above 2983 // in the calculation of size_of_reserve. 2984 char * next_alloc_addr = p_buf; 2985 HANDLE hProc = GetCurrentProcess(); 2986 2987 #ifdef ASSERT 2988 // Variable for the failure injection 2989 long ran_num = os::random(); 2990 size_t fail_after = ran_num % bytes; 2991 #endif 2992 2993 int count=0; 2994 while (bytes_remaining) { 2995 // select bytes_to_rq to get to the next chunk_size boundary 2996 2997 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size)); 2998 // Note allocate and commit 2999 char * p_new; 3000 3001 #ifdef ASSERT 3002 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after); 3003 #else 3004 const bool inject_error_now = false; 3005 #endif 3006 3007 if (inject_error_now) { 3008 p_new = NULL; 3009 } else { 3010 if (!UseNUMAInterleaving) { 3011 p_new = (char *) VirtualAlloc(next_alloc_addr, 3012 bytes_to_rq, 3013 flags, 3014 prot); 3015 } else { 3016 // get the next node to use from the used_node_list 3017 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected"); 3018 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count()); 3019 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node); 3020 } 3021 } 3022 3023 if (p_new == NULL) { 3024 // Free any allocated pages 3025 if (next_alloc_addr > p_buf) { 3026 // Some memory was committed so release it. 3027 size_t bytes_to_release = bytes - bytes_remaining; 3028 // NMT has yet to record any individual blocks, so it 3029 // need to create a dummy 'reserve' record to match 3030 // the release. 3031 MemTracker::record_virtual_memory_reserve((address)p_buf, 3032 bytes_to_release, CALLER_PC); 3033 os::release_memory(p_buf, bytes_to_release); 3034 } 3035 #ifdef ASSERT 3036 if (should_inject_error) { 3037 log_develop_debug(pagesize)("Reserving pages individually failed."); 3038 } 3039 #endif 3040 return NULL; 3041 } 3042 3043 bytes_remaining -= bytes_to_rq; 3044 next_alloc_addr += bytes_to_rq; 3045 count++; 3046 } 3047 // Although the memory is allocated individually, it is returned as one. 3048 // NMT records it as one block. 3049 if ((flags & MEM_COMMIT) != 0) { 3050 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC); 3051 } else { 3052 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC); 3053 } 3054 3055 // made it this far, success 3056 return p_buf; 3057 } 3058 3059 3060 3061 void os::large_page_init() { 3062 if (!UseLargePages) return; 3063 3064 // print a warning if any large page related flag is specified on command line 3065 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 3066 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 3067 bool success = false; 3068 3069 #define WARN(msg) if (warn_on_failure) { warning(msg); } 3070 if (request_lock_memory_privilege()) { 3071 size_t s = GetLargePageMinimum(); 3072 if (s) { 3073 #if defined(IA32) || defined(AMD64) 3074 if (s > 4*M || LargePageSizeInBytes > 4*M) { 3075 WARN("JVM cannot use large pages bigger than 4mb."); 3076 } else { 3077 #endif 3078 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 3079 _large_page_size = LargePageSizeInBytes; 3080 } else { 3081 _large_page_size = s; 3082 } 3083 success = true; 3084 #if defined(IA32) || defined(AMD64) 3085 } 3086 #endif 3087 } else { 3088 WARN("Large page is not supported by the processor."); 3089 } 3090 } else { 3091 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 3092 } 3093 #undef WARN 3094 3095 const size_t default_page_size = (size_t) vm_page_size(); 3096 if (success && _large_page_size > default_page_size) { 3097 _page_sizes[0] = _large_page_size; 3098 _page_sizes[1] = default_page_size; 3099 _page_sizes[2] = 0; 3100 } 3101 3102 cleanup_after_large_page_init(); 3103 UseLargePages = success; 3104 } 3105 3106 // On win32, one cannot release just a part of reserved memory, it's an 3107 // all or nothing deal. When we split a reservation, we must break the 3108 // reservation into two reservations. 3109 void os::pd_split_reserved_memory(char *base, size_t size, size_t split, 3110 bool realloc) { 3111 if (size > 0) { 3112 release_memory(base, size); 3113 if (realloc) { 3114 reserve_memory(split, base); 3115 } 3116 if (size != split) { 3117 reserve_memory(size - split, base + split); 3118 } 3119 } 3120 } 3121 3122 // Multiple threads can race in this code but it's not possible to unmap small sections of 3123 // virtual space to get requested alignment, like posix-like os's. 3124 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe. 3125 char* os::reserve_memory_aligned(size_t size, size_t alignment) { 3126 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 3127 "Alignment must be a multiple of allocation granularity (page size)"); 3128 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 3129 3130 size_t extra_size = size + alignment; 3131 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 3132 3133 char* aligned_base = NULL; 3134 3135 do { 3136 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 3137 if (extra_base == NULL) { 3138 return NULL; 3139 } 3140 // Do manual alignment 3141 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 3142 3143 os::release_memory(extra_base, extra_size); 3144 3145 aligned_base = os::reserve_memory(size, aligned_base); 3146 3147 } while (aligned_base == NULL); 3148 3149 return aligned_base; 3150 } 3151 3152 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 3153 assert((size_t)addr % os::vm_allocation_granularity() == 0, 3154 "reserve alignment"); 3155 assert(bytes % os::vm_page_size() == 0, "reserve page size"); 3156 char* res; 3157 // note that if UseLargePages is on, all the areas that require interleaving 3158 // will go thru reserve_memory_special rather than thru here. 3159 bool use_individual = (UseNUMAInterleaving && !UseLargePages); 3160 if (!use_individual) { 3161 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 3162 } else { 3163 elapsedTimer reserveTimer; 3164 if (Verbose && PrintMiscellaneous) reserveTimer.start(); 3165 // in numa interleaving, we have to allocate pages individually 3166 // (well really chunks of NUMAInterleaveGranularity size) 3167 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE); 3168 if (res == NULL) { 3169 warning("NUMA page allocation failed"); 3170 } 3171 if (Verbose && PrintMiscellaneous) { 3172 reserveTimer.stop(); 3173 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes, 3174 reserveTimer.milliseconds(), reserveTimer.ticks()); 3175 } 3176 } 3177 assert(res == NULL || addr == NULL || addr == res, 3178 "Unexpected address from reserve."); 3179 3180 return res; 3181 } 3182 3183 // Reserve memory at an arbitrary address, only if that area is 3184 // available (and not reserved for something else). 3185 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3186 // Windows os::reserve_memory() fails of the requested address range is 3187 // not avilable. 3188 return reserve_memory(bytes, requested_addr); 3189 } 3190 3191 size_t os::large_page_size() { 3192 return _large_page_size; 3193 } 3194 3195 bool os::can_commit_large_page_memory() { 3196 // Windows only uses large page memory when the entire region is reserved 3197 // and committed in a single VirtualAlloc() call. This may change in the 3198 // future, but with Windows 2003 it's not possible to commit on demand. 3199 return false; 3200 } 3201 3202 bool os::can_execute_large_page_memory() { 3203 return true; 3204 } 3205 3206 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, 3207 bool exec) { 3208 assert(UseLargePages, "only for large pages"); 3209 3210 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { 3211 return NULL; // Fallback to small pages. 3212 } 3213 3214 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 3215 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3216 3217 // with large pages, there are two cases where we need to use Individual Allocation 3218 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003) 3219 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page 3220 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) { 3221 log_debug(pagesize)("Reserving large pages individually."); 3222 3223 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError); 3224 if (p_buf == NULL) { 3225 // give an appropriate warning message 3226 if (UseNUMAInterleaving) { 3227 warning("NUMA large page allocation failed, UseLargePages flag ignored"); 3228 } 3229 if (UseLargePagesIndividualAllocation) { 3230 warning("Individually allocated large pages failed, " 3231 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 3232 } 3233 return NULL; 3234 } 3235 3236 return p_buf; 3237 3238 } else { 3239 log_debug(pagesize)("Reserving large pages in a single large chunk."); 3240 3241 // normal policy just allocate it all at once 3242 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3243 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); 3244 if (res != NULL) { 3245 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC); 3246 } 3247 3248 return res; 3249 } 3250 } 3251 3252 bool os::release_memory_special(char* base, size_t bytes) { 3253 assert(base != NULL, "Sanity check"); 3254 return release_memory(base, bytes); 3255 } 3256 3257 void os::print_statistics() { 3258 } 3259 3260 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) { 3261 int err = os::get_last_error(); 3262 char buf[256]; 3263 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3264 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 3265 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3266 exec, buf_len != 0 ? buf : "<no_error_string>", err); 3267 } 3268 3269 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 3270 if (bytes == 0) { 3271 // Don't bother the OS with noops. 3272 return true; 3273 } 3274 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 3275 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 3276 // Don't attempt to print anything if the OS call fails. We're 3277 // probably low on resources, so the print itself may cause crashes. 3278 3279 // unless we have NUMAInterleaving enabled, the range of a commit 3280 // is always within a reserve covered by a single VirtualAlloc 3281 // in that case we can just do a single commit for the requested size 3282 if (!UseNUMAInterleaving) { 3283 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) { 3284 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3285 return false; 3286 } 3287 if (exec) { 3288 DWORD oldprot; 3289 // Windows doc says to use VirtualProtect to get execute permissions 3290 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) { 3291 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3292 return false; 3293 } 3294 } 3295 return true; 3296 } else { 3297 3298 // when NUMAInterleaving is enabled, the commit might cover a range that 3299 // came from multiple VirtualAlloc reserves (using allocate_pages_individually). 3300 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery 3301 // returns represents the number of bytes that can be committed in one step. 3302 size_t bytes_remaining = bytes; 3303 char * next_alloc_addr = addr; 3304 while (bytes_remaining > 0) { 3305 MEMORY_BASIC_INFORMATION alloc_info; 3306 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info)); 3307 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3308 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, 3309 PAGE_READWRITE) == NULL) { 3310 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3311 exec);) 3312 return false; 3313 } 3314 if (exec) { 3315 DWORD oldprot; 3316 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, 3317 PAGE_EXECUTE_READWRITE, &oldprot)) { 3318 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3319 exec);) 3320 return false; 3321 } 3322 } 3323 bytes_remaining -= bytes_to_rq; 3324 next_alloc_addr += bytes_to_rq; 3325 } 3326 } 3327 // if we made it this far, return true 3328 return true; 3329 } 3330 3331 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 3332 bool exec) { 3333 // alignment_hint is ignored on this OS 3334 return pd_commit_memory(addr, size, exec); 3335 } 3336 3337 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 3338 const char* mesg) { 3339 assert(mesg != NULL, "mesg must be specified"); 3340 if (!pd_commit_memory(addr, size, exec)) { 3341 warn_fail_commit_memory(addr, size, exec); 3342 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 3343 } 3344 } 3345 3346 void os::pd_commit_memory_or_exit(char* addr, size_t size, 3347 size_t alignment_hint, bool exec, 3348 const char* mesg) { 3349 // alignment_hint is ignored on this OS 3350 pd_commit_memory_or_exit(addr, size, exec, mesg); 3351 } 3352 3353 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3354 if (bytes == 0) { 3355 // Don't bother the OS with noops. 3356 return true; 3357 } 3358 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 3359 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 3360 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0); 3361 } 3362 3363 bool os::pd_release_memory(char* addr, size_t bytes) { 3364 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 3365 } 3366 3367 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 3368 return os::commit_memory(addr, size, !ExecMem); 3369 } 3370 3371 bool os::remove_stack_guard_pages(char* addr, size_t size) { 3372 return os::uncommit_memory(addr, size); 3373 } 3374 3375 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) { 3376 uint count = 0; 3377 bool ret = false; 3378 size_t bytes_remaining = bytes; 3379 char * next_protect_addr = addr; 3380 3381 // Use VirtualQuery() to get the chunk size. 3382 while (bytes_remaining) { 3383 MEMORY_BASIC_INFORMATION alloc_info; 3384 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) { 3385 return false; 3386 } 3387 3388 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3389 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving, 3390 // but we don't distinguish here as both cases are protected by same API. 3391 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0; 3392 warning("Failed protecting pages individually for chunk #%u", count); 3393 if (!ret) { 3394 return false; 3395 } 3396 3397 bytes_remaining -= bytes_to_protect; 3398 next_protect_addr += bytes_to_protect; 3399 count++; 3400 } 3401 return ret; 3402 } 3403 3404 // Set protections specified 3405 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3406 bool is_committed) { 3407 unsigned int p = 0; 3408 switch (prot) { 3409 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 3410 case MEM_PROT_READ: p = PAGE_READONLY; break; 3411 case MEM_PROT_RW: p = PAGE_READWRITE; break; 3412 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 3413 default: 3414 ShouldNotReachHere(); 3415 } 3416 3417 DWORD old_status; 3418 3419 // Strange enough, but on Win32 one can change protection only for committed 3420 // memory, not a big deal anyway, as bytes less or equal than 64K 3421 if (!is_committed) { 3422 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX, 3423 "cannot commit protection page"); 3424 } 3425 // One cannot use os::guard_memory() here, as on Win32 guard page 3426 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 3427 // 3428 // Pages in the region become guard pages. Any attempt to access a guard page 3429 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 3430 // the guard page status. Guard pages thus act as a one-time access alarm. 3431 bool ret; 3432 if (UseNUMAInterleaving) { 3433 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time, 3434 // so we must protect the chunks individually. 3435 ret = protect_pages_individually(addr, bytes, p, &old_status); 3436 } else { 3437 ret = VirtualProtect(addr, bytes, p, &old_status) != 0; 3438 } 3439 #ifdef ASSERT 3440 if (!ret) { 3441 int err = os::get_last_error(); 3442 char buf[256]; 3443 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3444 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT 3445 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3446 buf_len != 0 ? buf : "<no_error_string>", err); 3447 } 3448 #endif 3449 return ret; 3450 } 3451 3452 bool os::guard_memory(char* addr, size_t bytes) { 3453 DWORD old_status; 3454 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 3455 } 3456 3457 bool os::unguard_memory(char* addr, size_t bytes) { 3458 DWORD old_status; 3459 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 3460 } 3461 3462 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3463 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3464 void os::numa_make_global(char *addr, size_t bytes) { } 3465 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 3466 bool os::numa_topology_changed() { return false; } 3467 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); } 3468 int os::numa_get_group_id() { return 0; } 3469 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 3470 if (numa_node_list_holder.get_count() == 0 && size > 0) { 3471 // Provide an answer for UMA systems 3472 ids[0] = 0; 3473 return 1; 3474 } else { 3475 // check for size bigger than actual groups_num 3476 size = MIN2(size, numa_get_groups_num()); 3477 for (int i = 0; i < (int)size; i++) { 3478 ids[i] = numa_node_list_holder.get_node_list_entry(i); 3479 } 3480 return size; 3481 } 3482 } 3483 3484 bool os::get_page_info(char *start, page_info* info) { 3485 return false; 3486 } 3487 3488 char *os::scan_pages(char *start, char* end, page_info* page_expected, 3489 page_info* page_found) { 3490 return end; 3491 } 3492 3493 char* os::non_memory_address_word() { 3494 // Must never look like an address returned by reserve_memory, 3495 // even in its subfields (as defined by the CPU immediate fields, 3496 // if the CPU splits constants across multiple instructions). 3497 return (char*)-1; 3498 } 3499 3500 #define MAX_ERROR_COUNT 100 3501 #define SYS_THREAD_ERROR 0xffffffffUL 3502 3503 void os::pd_start_thread(Thread* thread) { 3504 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 3505 // Returns previous suspend state: 3506 // 0: Thread was not suspended 3507 // 1: Thread is running now 3508 // >1: Thread is still suspended. 3509 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3510 } 3511 3512 class HighResolutionInterval : public CHeapObj<mtThread> { 3513 // The default timer resolution seems to be 10 milliseconds. 3514 // (Where is this written down?) 3515 // If someone wants to sleep for only a fraction of the default, 3516 // then we set the timer resolution down to 1 millisecond for 3517 // the duration of their interval. 3518 // We carefully set the resolution back, since otherwise we 3519 // seem to incur an overhead (3%?) that we don't need. 3520 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 3521 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 3522 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 3523 // timeBeginPeriod() if the relative error exceeded some threshold. 3524 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 3525 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 3526 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 3527 // resolution timers running. 3528 private: 3529 jlong resolution; 3530 public: 3531 HighResolutionInterval(jlong ms) { 3532 resolution = ms % 10L; 3533 if (resolution != 0) { 3534 MMRESULT result = timeBeginPeriod(1L); 3535 } 3536 } 3537 ~HighResolutionInterval() { 3538 if (resolution != 0) { 3539 MMRESULT result = timeEndPeriod(1L); 3540 } 3541 resolution = 0L; 3542 } 3543 }; 3544 3545 int os::sleep(Thread* thread, jlong ms, bool interruptable) { 3546 jlong limit = (jlong) MAXDWORD; 3547 3548 while (ms > limit) { 3549 int res; 3550 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) { 3551 return res; 3552 } 3553 ms -= limit; 3554 } 3555 3556 assert(thread == Thread::current(), "thread consistency check"); 3557 OSThread* osthread = thread->osthread(); 3558 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 3559 int result; 3560 if (interruptable) { 3561 assert(thread->is_Java_thread(), "must be java thread"); 3562 JavaThread *jt = (JavaThread *) thread; 3563 ThreadBlockInVM tbivm(jt); 3564 3565 jt->set_suspend_equivalent(); 3566 // cleared by handle_special_suspend_equivalent_condition() or 3567 // java_suspend_self() via check_and_wait_while_suspended() 3568 3569 HANDLE events[1]; 3570 events[0] = osthread->interrupt_event(); 3571 HighResolutionInterval *phri=NULL; 3572 if (!ForceTimeHighResolution) { 3573 phri = new HighResolutionInterval(ms); 3574 } 3575 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 3576 result = OS_TIMEOUT; 3577 } else { 3578 ResetEvent(osthread->interrupt_event()); 3579 osthread->set_interrupted(false); 3580 result = OS_INTRPT; 3581 } 3582 delete phri; //if it is NULL, harmless 3583 3584 // were we externally suspended while we were waiting? 3585 jt->check_and_wait_while_suspended(); 3586 } else { 3587 assert(!thread->is_Java_thread(), "must not be java thread"); 3588 Sleep((long) ms); 3589 result = OS_TIMEOUT; 3590 } 3591 return result; 3592 } 3593 3594 // Short sleep, direct OS call. 3595 // 3596 // ms = 0, means allow others (if any) to run. 3597 // 3598 void os::naked_short_sleep(jlong ms) { 3599 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3600 Sleep(ms); 3601 } 3602 3603 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3604 void os::infinite_sleep() { 3605 while (true) { // sleep forever ... 3606 Sleep(100000); // ... 100 seconds at a time 3607 } 3608 } 3609 3610 typedef BOOL (WINAPI * STTSignature)(void); 3611 3612 void os::naked_yield() { 3613 // Consider passing back the return value from SwitchToThread(). 3614 SwitchToThread(); 3615 } 3616 3617 // Win32 only gives you access to seven real priorities at a time, 3618 // so we compress Java's ten down to seven. It would be better 3619 // if we dynamically adjusted relative priorities. 3620 3621 int os::java_to_os_priority[CriticalPriority + 1] = { 3622 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3623 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3624 THREAD_PRIORITY_LOWEST, // 2 3625 THREAD_PRIORITY_BELOW_NORMAL, // 3 3626 THREAD_PRIORITY_BELOW_NORMAL, // 4 3627 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3628 THREAD_PRIORITY_NORMAL, // 6 3629 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3630 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3631 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3632 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority 3633 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority 3634 }; 3635 3636 int prio_policy1[CriticalPriority + 1] = { 3637 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3638 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3639 THREAD_PRIORITY_LOWEST, // 2 3640 THREAD_PRIORITY_BELOW_NORMAL, // 3 3641 THREAD_PRIORITY_BELOW_NORMAL, // 4 3642 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3643 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3644 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3645 THREAD_PRIORITY_HIGHEST, // 8 3646 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3647 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority 3648 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority 3649 }; 3650 3651 static int prio_init() { 3652 // If ThreadPriorityPolicy is 1, switch tables 3653 if (ThreadPriorityPolicy == 1) { 3654 int i; 3655 for (i = 0; i < CriticalPriority + 1; i++) { 3656 os::java_to_os_priority[i] = prio_policy1[i]; 3657 } 3658 } 3659 if (UseCriticalJavaThreadPriority) { 3660 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 3661 } 3662 return 0; 3663 } 3664 3665 OSReturn os::set_native_priority(Thread* thread, int priority) { 3666 if (!UseThreadPriorities) return OS_OK; 3667 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3668 return ret ? OS_OK : OS_ERR; 3669 } 3670 3671 OSReturn os::get_native_priority(const Thread* const thread, 3672 int* priority_ptr) { 3673 if (!UseThreadPriorities) { 3674 *priority_ptr = java_to_os_priority[NormPriority]; 3675 return OS_OK; 3676 } 3677 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3678 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3679 assert(false, "GetThreadPriority failed"); 3680 return OS_ERR; 3681 } 3682 *priority_ptr = os_prio; 3683 return OS_OK; 3684 } 3685 3686 3687 // Hint to the underlying OS that a task switch would not be good. 3688 // Void return because it's a hint and can fail. 3689 void os::hint_no_preempt() {} 3690 3691 void os::interrupt(Thread* thread) { 3692 assert(!thread->is_Java_thread() || Thread::current() == thread || 3693 Threads_lock->owned_by_self(), 3694 "possibility of dangling Thread pointer"); 3695 3696 OSThread* osthread = thread->osthread(); 3697 osthread->set_interrupted(true); 3698 // More than one thread can get here with the same value of osthread, 3699 // resulting in multiple notifications. We do, however, want the store 3700 // to interrupted() to be visible to other threads before we post 3701 // the interrupt event. 3702 OrderAccess::release(); 3703 SetEvent(osthread->interrupt_event()); 3704 // For JSR166: unpark after setting status 3705 if (thread->is_Java_thread()) { 3706 ((JavaThread*)thread)->parker()->unpark(); 3707 } 3708 3709 ParkEvent * ev = thread->_ParkEvent; 3710 if (ev != NULL) ev->unpark(); 3711 } 3712 3713 3714 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3715 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3716 "possibility of dangling Thread pointer"); 3717 3718 OSThread* osthread = thread->osthread(); 3719 // There is no synchronization between the setting of the interrupt 3720 // and it being cleared here. It is critical - see 6535709 - that 3721 // we only clear the interrupt state, and reset the interrupt event, 3722 // if we are going to report that we were indeed interrupted - else 3723 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups 3724 // depending on the timing. By checking thread interrupt event to see 3725 // if the thread gets real interrupt thus prevent spurious wakeup. 3726 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0); 3727 if (interrupted && clear_interrupted) { 3728 osthread->set_interrupted(false); 3729 ResetEvent(osthread->interrupt_event()); 3730 } // Otherwise leave the interrupted state alone 3731 3732 return interrupted; 3733 } 3734 3735 // Get's a pc (hint) for a running thread. Currently used only for profiling. 3736 ExtendedPC os::get_thread_pc(Thread* thread) { 3737 CONTEXT context; 3738 context.ContextFlags = CONTEXT_CONTROL; 3739 HANDLE handle = thread->osthread()->thread_handle(); 3740 #ifdef _M_IA64 3741 assert(0, "Fix get_thread_pc"); 3742 return ExtendedPC(NULL); 3743 #else 3744 if (GetThreadContext(handle, &context)) { 3745 #ifdef _M_AMD64 3746 return ExtendedPC((address) context.Rip); 3747 #else 3748 return ExtendedPC((address) context.Eip); 3749 #endif 3750 } else { 3751 return ExtendedPC(NULL); 3752 } 3753 #endif 3754 } 3755 3756 // GetCurrentThreadId() returns DWORD 3757 intx os::current_thread_id() { return GetCurrentThreadId(); } 3758 3759 static int _initial_pid = 0; 3760 3761 int os::current_process_id() { 3762 return (_initial_pid ? _initial_pid : _getpid()); 3763 } 3764 3765 int os::win32::_vm_page_size = 0; 3766 int os::win32::_vm_allocation_granularity = 0; 3767 int os::win32::_processor_type = 0; 3768 // Processor level is not available on non-NT systems, use vm_version instead 3769 int os::win32::_processor_level = 0; 3770 julong os::win32::_physical_memory = 0; 3771 size_t os::win32::_default_stack_size = 0; 3772 3773 intx os::win32::_os_thread_limit = 0; 3774 volatile intx os::win32::_os_thread_count = 0; 3775 3776 bool os::win32::_is_windows_server = false; 3777 3778 // 6573254 3779 // Currently, the bug is observed across all the supported Windows releases, 3780 // including the latest one (as of this writing - Windows Server 2012 R2) 3781 bool os::win32::_has_exit_bug = true; 3782 3783 void os::win32::initialize_system_info() { 3784 SYSTEM_INFO si; 3785 GetSystemInfo(&si); 3786 _vm_page_size = si.dwPageSize; 3787 _vm_allocation_granularity = si.dwAllocationGranularity; 3788 _processor_type = si.dwProcessorType; 3789 _processor_level = si.wProcessorLevel; 3790 set_processor_count(si.dwNumberOfProcessors); 3791 3792 MEMORYSTATUSEX ms; 3793 ms.dwLength = sizeof(ms); 3794 3795 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3796 // dwMemoryLoad (% of memory in use) 3797 GlobalMemoryStatusEx(&ms); 3798 _physical_memory = ms.ullTotalPhys; 3799 3800 OSVERSIONINFOEX oi; 3801 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 3802 GetVersionEx((OSVERSIONINFO*)&oi); 3803 switch (oi.dwPlatformId) { 3804 case VER_PLATFORM_WIN32_NT: 3805 { 3806 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3807 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER || 3808 oi.wProductType == VER_NT_SERVER) { 3809 _is_windows_server = true; 3810 } 3811 } 3812 break; 3813 default: fatal("Unknown platform"); 3814 } 3815 3816 _default_stack_size = os::current_stack_size(); 3817 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3818 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3819 "stack size not a multiple of page size"); 3820 3821 initialize_performance_counter(); 3822 } 3823 3824 3825 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, 3826 int ebuflen) { 3827 char path[MAX_PATH]; 3828 DWORD size; 3829 DWORD pathLen = (DWORD)sizeof(path); 3830 HINSTANCE result = NULL; 3831 3832 // only allow library name without path component 3833 assert(strchr(name, '\\') == NULL, "path not allowed"); 3834 assert(strchr(name, ':') == NULL, "path not allowed"); 3835 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) { 3836 jio_snprintf(ebuf, ebuflen, 3837 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name); 3838 return NULL; 3839 } 3840 3841 // search system directory 3842 if ((size = GetSystemDirectory(path, pathLen)) > 0) { 3843 if (size >= pathLen) { 3844 return NULL; // truncated 3845 } 3846 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3847 return NULL; // truncated 3848 } 3849 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3850 return result; 3851 } 3852 } 3853 3854 // try Windows directory 3855 if ((size = GetWindowsDirectory(path, pathLen)) > 0) { 3856 if (size >= pathLen) { 3857 return NULL; // truncated 3858 } 3859 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3860 return NULL; // truncated 3861 } 3862 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3863 return result; 3864 } 3865 } 3866 3867 jio_snprintf(ebuf, ebuflen, 3868 "os::win32::load_windows_dll() cannot load %s from system directories.", name); 3869 return NULL; 3870 } 3871 3872 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS) 3873 #define EXIT_TIMEOUT 300000 /* 5 minutes */ 3874 3875 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) { 3876 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect); 3877 return TRUE; 3878 } 3879 3880 int os::win32::exit_process_or_thread(Ept what, int exit_code) { 3881 // Basic approach: 3882 // - Each exiting thread registers its intent to exit and then does so. 3883 // - A thread trying to terminate the process must wait for all 3884 // threads currently exiting to complete their exit. 3885 3886 if (os::win32::has_exit_bug()) { 3887 // The array holds handles of the threads that have started exiting by calling 3888 // _endthreadex(). 3889 // Should be large enough to avoid blocking the exiting thread due to lack of 3890 // a free slot. 3891 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP]; 3892 static int handle_count = 0; 3893 3894 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT; 3895 static CRITICAL_SECTION crit_sect; 3896 static volatile jint process_exiting = 0; 3897 int i, j; 3898 DWORD res; 3899 HANDLE hproc, hthr; 3900 3901 // We only attempt to register threads until a process exiting 3902 // thread manages to set the process_exiting flag. Any threads 3903 // that come through here after the process_exiting flag is set 3904 // are unregistered and will be caught in the SuspendThread() 3905 // infinite loop below. 3906 bool registered = false; 3907 3908 // The first thread that reached this point, initializes the critical section. 3909 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) { 3910 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__); 3911 } else if (OrderAccess::load_acquire(&process_exiting) == 0) { 3912 if (what != EPT_THREAD) { 3913 // Atomically set process_exiting before the critical section 3914 // to increase the visibility between racing threads. 3915 Atomic::cmpxchg((jint)GetCurrentThreadId(), &process_exiting, 0); 3916 } 3917 EnterCriticalSection(&crit_sect); 3918 3919 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) { 3920 // Remove from the array those handles of the threads that have completed exiting. 3921 for (i = 0, j = 0; i < handle_count; ++i) { 3922 res = WaitForSingleObject(handles[i], 0 /* don't wait */); 3923 if (res == WAIT_TIMEOUT) { 3924 handles[j++] = handles[i]; 3925 } else { 3926 if (res == WAIT_FAILED) { 3927 warning("WaitForSingleObject failed (%u) in %s: %d\n", 3928 GetLastError(), __FILE__, __LINE__); 3929 } 3930 // Don't keep the handle, if we failed waiting for it. 3931 CloseHandle(handles[i]); 3932 } 3933 } 3934 3935 // If there's no free slot in the array of the kept handles, we'll have to 3936 // wait until at least one thread completes exiting. 3937 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) { 3938 // Raise the priority of the oldest exiting thread to increase its chances 3939 // to complete sooner. 3940 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL); 3941 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT); 3942 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) { 3943 i = (res - WAIT_OBJECT_0); 3944 handle_count = MAXIMUM_THREADS_TO_KEEP - 1; 3945 for (; i < handle_count; ++i) { 3946 handles[i] = handles[i + 1]; 3947 } 3948 } else { 3949 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3950 (res == WAIT_FAILED ? "failed" : "timed out"), 3951 GetLastError(), __FILE__, __LINE__); 3952 // Don't keep handles, if we failed waiting for them. 3953 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) { 3954 CloseHandle(handles[i]); 3955 } 3956 handle_count = 0; 3957 } 3958 } 3959 3960 // Store a duplicate of the current thread handle in the array of handles. 3961 hproc = GetCurrentProcess(); 3962 hthr = GetCurrentThread(); 3963 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count], 3964 0, FALSE, DUPLICATE_SAME_ACCESS)) { 3965 warning("DuplicateHandle failed (%u) in %s: %d\n", 3966 GetLastError(), __FILE__, __LINE__); 3967 3968 // We can't register this thread (no more handles) so this thread 3969 // may be racing with a thread that is calling exit(). If the thread 3970 // that is calling exit() has managed to set the process_exiting 3971 // flag, then this thread will be caught in the SuspendThread() 3972 // infinite loop below which closes that race. A small timing 3973 // window remains before the process_exiting flag is set, but it 3974 // is only exposed when we are out of handles. 3975 } else { 3976 ++handle_count; 3977 registered = true; 3978 3979 // The current exiting thread has stored its handle in the array, and now 3980 // should leave the critical section before calling _endthreadex(). 3981 } 3982 3983 } else if (what != EPT_THREAD && handle_count > 0) { 3984 jlong start_time, finish_time, timeout_left; 3985 // Before ending the process, make sure all the threads that had called 3986 // _endthreadex() completed. 3987 3988 // Set the priority level of the current thread to the same value as 3989 // the priority level of exiting threads. 3990 // This is to ensure it will be given a fair chance to execute if 3991 // the timeout expires. 3992 hthr = GetCurrentThread(); 3993 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL); 3994 start_time = os::javaTimeNanos(); 3995 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L); 3996 for (i = 0; ; ) { 3997 int portion_count = handle_count - i; 3998 if (portion_count > MAXIMUM_WAIT_OBJECTS) { 3999 portion_count = MAXIMUM_WAIT_OBJECTS; 4000 } 4001 for (j = 0; j < portion_count; ++j) { 4002 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL); 4003 } 4004 timeout_left = (finish_time - start_time) / 1000000L; 4005 if (timeout_left < 0) { 4006 timeout_left = 0; 4007 } 4008 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left); 4009 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) { 4010 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 4011 (res == WAIT_FAILED ? "failed" : "timed out"), 4012 GetLastError(), __FILE__, __LINE__); 4013 // Reset portion_count so we close the remaining 4014 // handles due to this error. 4015 portion_count = handle_count - i; 4016 } 4017 for (j = 0; j < portion_count; ++j) { 4018 CloseHandle(handles[i + j]); 4019 } 4020 if ((i += portion_count) >= handle_count) { 4021 break; 4022 } 4023 start_time = os::javaTimeNanos(); 4024 } 4025 handle_count = 0; 4026 } 4027 4028 LeaveCriticalSection(&crit_sect); 4029 } 4030 4031 if (!registered && 4032 OrderAccess::load_acquire(&process_exiting) != 0 && 4033 process_exiting != (jint)GetCurrentThreadId()) { 4034 // Some other thread is about to call exit(), so we don't let 4035 // the current unregistered thread proceed to exit() or _endthreadex() 4036 while (true) { 4037 SuspendThread(GetCurrentThread()); 4038 // Avoid busy-wait loop, if SuspendThread() failed. 4039 Sleep(EXIT_TIMEOUT); 4040 } 4041 } 4042 } 4043 4044 // We are here if either 4045 // - there's no 'race at exit' bug on this OS release; 4046 // - initialization of the critical section failed (unlikely); 4047 // - the current thread has registered itself and left the critical section; 4048 // - the process-exiting thread has raised the flag and left the critical section. 4049 if (what == EPT_THREAD) { 4050 _endthreadex((unsigned)exit_code); 4051 } else if (what == EPT_PROCESS) { 4052 ::exit(exit_code); 4053 } else { 4054 _exit(exit_code); 4055 } 4056 4057 // Should not reach here 4058 return exit_code; 4059 } 4060 4061 #undef EXIT_TIMEOUT 4062 4063 void os::win32::setmode_streams() { 4064 _setmode(_fileno(stdin), _O_BINARY); 4065 _setmode(_fileno(stdout), _O_BINARY); 4066 _setmode(_fileno(stderr), _O_BINARY); 4067 } 4068 4069 4070 bool os::is_debugger_attached() { 4071 return IsDebuggerPresent() ? true : false; 4072 } 4073 4074 4075 void os::wait_for_keypress_at_exit(void) { 4076 if (PauseAtExit) { 4077 fprintf(stderr, "Press any key to continue...\n"); 4078 fgetc(stdin); 4079 } 4080 } 4081 4082 4083 bool os::message_box(const char* title, const char* message) { 4084 int result = MessageBox(NULL, message, title, 4085 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 4086 return result == IDYES; 4087 } 4088 4089 #ifndef PRODUCT 4090 #ifndef _WIN64 4091 // Helpers to check whether NX protection is enabled 4092 int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 4093 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 4094 pex->ExceptionRecord->NumberParameters > 0 && 4095 pex->ExceptionRecord->ExceptionInformation[0] == 4096 EXCEPTION_INFO_EXEC_VIOLATION) { 4097 return EXCEPTION_EXECUTE_HANDLER; 4098 } 4099 return EXCEPTION_CONTINUE_SEARCH; 4100 } 4101 4102 void nx_check_protection() { 4103 // If NX is enabled we'll get an exception calling into code on the stack 4104 char code[] = { (char)0xC3 }; // ret 4105 void *code_ptr = (void *)code; 4106 __try { 4107 __asm call code_ptr 4108 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 4109 tty->print_raw_cr("NX protection detected."); 4110 } 4111 } 4112 #endif // _WIN64 4113 #endif // PRODUCT 4114 4115 // This is called _before_ the global arguments have been parsed 4116 void os::init(void) { 4117 _initial_pid = _getpid(); 4118 4119 init_random(1234567); 4120 4121 win32::initialize_system_info(); 4122 win32::setmode_streams(); 4123 init_page_sizes((size_t) win32::vm_page_size()); 4124 4125 // This may be overridden later when argument processing is done. 4126 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, false); 4127 4128 // Initialize main_process and main_thread 4129 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 4130 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 4131 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 4132 fatal("DuplicateHandle failed\n"); 4133 } 4134 main_thread_id = (int) GetCurrentThreadId(); 4135 4136 // initialize fast thread access - only used for 32-bit 4137 win32::initialize_thread_ptr_offset(); 4138 } 4139 4140 // To install functions for atexit processing 4141 extern "C" { 4142 static void perfMemory_exit_helper() { 4143 perfMemory_exit(); 4144 } 4145 } 4146 4147 static jint initSock(); 4148 4149 // this is called _after_ the global arguments have been parsed 4150 jint os::init_2(void) { 4151 // Allocate a single page and mark it as readable for safepoint polling 4152 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 4153 guarantee(polling_page != NULL, "Reserve Failed for polling page"); 4154 4155 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 4156 guarantee(return_page != NULL, "Commit Failed for polling page"); 4157 4158 os::set_polling_page(polling_page); 4159 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page)); 4160 4161 if (!UseMembar) { 4162 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE); 4163 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 4164 4165 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE); 4166 guarantee(return_page != NULL, "Commit Failed for memory serialize page"); 4167 4168 os::set_memory_serialize_page(mem_serialize_page); 4169 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page)); 4170 } 4171 4172 // Setup Windows Exceptions 4173 4174 // for debugging float code generation bugs 4175 if (ForceFloatExceptions) { 4176 #ifndef _WIN64 4177 static long fp_control_word = 0; 4178 __asm { fstcw fp_control_word } 4179 // see Intel PPro Manual, Vol. 2, p 7-16 4180 const long precision = 0x20; 4181 const long underflow = 0x10; 4182 const long overflow = 0x08; 4183 const long zero_div = 0x04; 4184 const long denorm = 0x02; 4185 const long invalid = 0x01; 4186 fp_control_word |= invalid; 4187 __asm { fldcw fp_control_word } 4188 #endif 4189 } 4190 4191 // If stack_commit_size is 0, windows will reserve the default size, 4192 // but only commit a small portion of it. 4193 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 4194 size_t default_reserve_size = os::win32::default_stack_size(); 4195 size_t actual_reserve_size = stack_commit_size; 4196 if (stack_commit_size < default_reserve_size) { 4197 // If stack_commit_size == 0, we want this too 4198 actual_reserve_size = default_reserve_size; 4199 } 4200 4201 // Check minimum allowable stack size for thread creation and to initialize 4202 // the java system classes, including StackOverflowError - depends on page 4203 // size. Add two 4K pages for compiler2 recursion in main thread. 4204 // Add in 4*BytesPerWord 4K pages to account for VM stack during 4205 // class initialization depending on 32 or 64 bit VM. 4206 size_t min_stack_allowed = 4207 (size_t)(JavaThread::stack_guard_zone_size() + 4208 JavaThread::stack_shadow_zone_size() + 4209 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K); 4210 4211 min_stack_allowed = align_size_up(min_stack_allowed, os::vm_page_size()); 4212 4213 if (actual_reserve_size < min_stack_allowed) { 4214 tty->print_cr("\nThe stack size specified is too small, " 4215 "Specify at least %dk", 4216 min_stack_allowed / K); 4217 return JNI_ERR; 4218 } 4219 4220 JavaThread::set_stack_size_at_create(stack_commit_size); 4221 4222 // Calculate theoretical max. size of Threads to guard gainst artifical 4223 // out-of-memory situations, where all available address-space has been 4224 // reserved by thread stacks. 4225 assert(actual_reserve_size != 0, "Must have a stack"); 4226 4227 // Calculate the thread limit when we should start doing Virtual Memory 4228 // banging. Currently when the threads will have used all but 200Mb of space. 4229 // 4230 // TODO: consider performing a similar calculation for commit size instead 4231 // as reserve size, since on a 64-bit platform we'll run into that more 4232 // often than running out of virtual memory space. We can use the 4233 // lower value of the two calculations as the os_thread_limit. 4234 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 4235 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 4236 4237 // at exit methods are called in the reverse order of their registration. 4238 // there is no limit to the number of functions registered. atexit does 4239 // not set errno. 4240 4241 if (PerfAllowAtExitRegistration) { 4242 // only register atexit functions if PerfAllowAtExitRegistration is set. 4243 // atexit functions can be delayed until process exit time, which 4244 // can be problematic for embedded VM situations. Embedded VMs should 4245 // call DestroyJavaVM() to assure that VM resources are released. 4246 4247 // note: perfMemory_exit_helper atexit function may be removed in 4248 // the future if the appropriate cleanup code can be added to the 4249 // VM_Exit VMOperation's doit method. 4250 if (atexit(perfMemory_exit_helper) != 0) { 4251 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 4252 } 4253 } 4254 4255 #ifndef _WIN64 4256 // Print something if NX is enabled (win32 on AMD64) 4257 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 4258 #endif 4259 4260 // initialize thread priority policy 4261 prio_init(); 4262 4263 if (UseNUMA && !ForceNUMA) { 4264 UseNUMA = false; // We don't fully support this yet 4265 } 4266 4267 if (UseNUMAInterleaving) { 4268 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag 4269 bool success = numa_interleaving_init(); 4270 if (!success) UseNUMAInterleaving = false; 4271 } 4272 4273 if (initSock() != JNI_OK) { 4274 return JNI_ERR; 4275 } 4276 4277 return JNI_OK; 4278 } 4279 4280 // Mark the polling page as unreadable 4281 void os::make_polling_page_unreadable(void) { 4282 DWORD old_status; 4283 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4284 PAGE_NOACCESS, &old_status)) { 4285 fatal("Could not disable polling page"); 4286 } 4287 } 4288 4289 // Mark the polling page as readable 4290 void os::make_polling_page_readable(void) { 4291 DWORD old_status; 4292 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4293 PAGE_READONLY, &old_status)) { 4294 fatal("Could not enable polling page"); 4295 } 4296 } 4297 4298 4299 int os::stat(const char *path, struct stat *sbuf) { 4300 char pathbuf[MAX_PATH]; 4301 if (strlen(path) > MAX_PATH - 1) { 4302 errno = ENAMETOOLONG; 4303 return -1; 4304 } 4305 os::native_path(strcpy(pathbuf, path)); 4306 int ret = ::stat(pathbuf, sbuf); 4307 if (sbuf != NULL && UseUTCFileTimestamp) { 4308 // Fix for 6539723. st_mtime returned from stat() is dependent on 4309 // the system timezone and so can return different values for the 4310 // same file if/when daylight savings time changes. This adjustment 4311 // makes sure the same timestamp is returned regardless of the TZ. 4312 // 4313 // See: 4314 // http://msdn.microsoft.com/library/ 4315 // default.asp?url=/library/en-us/sysinfo/base/ 4316 // time_zone_information_str.asp 4317 // and 4318 // http://msdn.microsoft.com/library/default.asp?url= 4319 // /library/en-us/sysinfo/base/settimezoneinformation.asp 4320 // 4321 // NOTE: there is a insidious bug here: If the timezone is changed 4322 // after the call to stat() but before 'GetTimeZoneInformation()', then 4323 // the adjustment we do here will be wrong and we'll return the wrong 4324 // value (which will likely end up creating an invalid class data 4325 // archive). Absent a better API for this, or some time zone locking 4326 // mechanism, we'll have to live with this risk. 4327 TIME_ZONE_INFORMATION tz; 4328 DWORD tzid = GetTimeZoneInformation(&tz); 4329 int daylightBias = 4330 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 4331 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 4332 } 4333 return ret; 4334 } 4335 4336 4337 #define FT2INT64(ft) \ 4338 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 4339 4340 4341 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4342 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4343 // of a thread. 4344 // 4345 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4346 // the fast estimate available on the platform. 4347 4348 // current_thread_cpu_time() is not optimized for Windows yet 4349 jlong os::current_thread_cpu_time() { 4350 // return user + sys since the cost is the same 4351 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 4352 } 4353 4354 jlong os::thread_cpu_time(Thread* thread) { 4355 // consistent with what current_thread_cpu_time() returns. 4356 return os::thread_cpu_time(thread, true /* user+sys */); 4357 } 4358 4359 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4360 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4361 } 4362 4363 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 4364 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 4365 // If this function changes, os::is_thread_cpu_time_supported() should too 4366 FILETIME CreationTime; 4367 FILETIME ExitTime; 4368 FILETIME KernelTime; 4369 FILETIME UserTime; 4370 4371 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime, 4372 &ExitTime, &KernelTime, &UserTime) == 0) { 4373 return -1; 4374 } else if (user_sys_cpu_time) { 4375 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 4376 } else { 4377 return FT2INT64(UserTime) * 100; 4378 } 4379 } 4380 4381 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4382 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4383 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4384 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4385 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4386 } 4387 4388 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4389 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4390 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4391 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4392 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4393 } 4394 4395 bool os::is_thread_cpu_time_supported() { 4396 // see os::thread_cpu_time 4397 FILETIME CreationTime; 4398 FILETIME ExitTime; 4399 FILETIME KernelTime; 4400 FILETIME UserTime; 4401 4402 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime, 4403 &KernelTime, &UserTime) == 0) { 4404 return false; 4405 } else { 4406 return true; 4407 } 4408 } 4409 4410 // Windows does't provide a loadavg primitive so this is stubbed out for now. 4411 // It does have primitives (PDH API) to get CPU usage and run queue length. 4412 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 4413 // If we wanted to implement loadavg on Windows, we have a few options: 4414 // 4415 // a) Query CPU usage and run queue length and "fake" an answer by 4416 // returning the CPU usage if it's under 100%, and the run queue 4417 // length otherwise. It turns out that querying is pretty slow 4418 // on Windows, on the order of 200 microseconds on a fast machine. 4419 // Note that on the Windows the CPU usage value is the % usage 4420 // since the last time the API was called (and the first call 4421 // returns 100%), so we'd have to deal with that as well. 4422 // 4423 // b) Sample the "fake" answer using a sampling thread and store 4424 // the answer in a global variable. The call to loadavg would 4425 // just return the value of the global, avoiding the slow query. 4426 // 4427 // c) Sample a better answer using exponential decay to smooth the 4428 // value. This is basically the algorithm used by UNIX kernels. 4429 // 4430 // Note that sampling thread starvation could affect both (b) and (c). 4431 int os::loadavg(double loadavg[], int nelem) { 4432 return -1; 4433 } 4434 4435 4436 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 4437 bool os::dont_yield() { 4438 return DontYieldALot; 4439 } 4440 4441 // This method is a slightly reworked copy of JDK's sysOpen 4442 // from src/windows/hpi/src/sys_api_md.c 4443 4444 int os::open(const char *path, int oflag, int mode) { 4445 char pathbuf[MAX_PATH]; 4446 4447 if (strlen(path) > MAX_PATH - 1) { 4448 errno = ENAMETOOLONG; 4449 return -1; 4450 } 4451 os::native_path(strcpy(pathbuf, path)); 4452 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 4453 } 4454 4455 FILE* os::open(int fd, const char* mode) { 4456 return ::_fdopen(fd, mode); 4457 } 4458 4459 // Is a (classpath) directory empty? 4460 bool os::dir_is_empty(const char* path) { 4461 WIN32_FIND_DATA fd; 4462 HANDLE f = FindFirstFile(path, &fd); 4463 if (f == INVALID_HANDLE_VALUE) { 4464 return true; 4465 } 4466 FindClose(f); 4467 return false; 4468 } 4469 4470 // create binary file, rewriting existing file if required 4471 int os::create_binary_file(const char* path, bool rewrite_existing) { 4472 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 4473 if (!rewrite_existing) { 4474 oflags |= _O_EXCL; 4475 } 4476 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 4477 } 4478 4479 // return current position of file pointer 4480 jlong os::current_file_offset(int fd) { 4481 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 4482 } 4483 4484 // move file pointer to the specified offset 4485 jlong os::seek_to_file_offset(int fd, jlong offset) { 4486 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 4487 } 4488 4489 4490 jlong os::lseek(int fd, jlong offset, int whence) { 4491 return (jlong) ::_lseeki64(fd, offset, whence); 4492 } 4493 4494 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 4495 OVERLAPPED ov; 4496 DWORD nread; 4497 BOOL result; 4498 4499 ZeroMemory(&ov, sizeof(ov)); 4500 ov.Offset = (DWORD)offset; 4501 ov.OffsetHigh = (DWORD)(offset >> 32); 4502 4503 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4504 4505 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov); 4506 4507 return result ? nread : 0; 4508 } 4509 4510 4511 // This method is a slightly reworked copy of JDK's sysNativePath 4512 // from src/windows/hpi/src/path_md.c 4513 4514 // Convert a pathname to native format. On win32, this involves forcing all 4515 // separators to be '\\' rather than '/' (both are legal inputs, but Win95 4516 // sometimes rejects '/') and removing redundant separators. The input path is 4517 // assumed to have been converted into the character encoding used by the local 4518 // system. Because this might be a double-byte encoding, care is taken to 4519 // treat double-byte lead characters correctly. 4520 // 4521 // This procedure modifies the given path in place, as the result is never 4522 // longer than the original. There is no error return; this operation always 4523 // succeeds. 4524 char * os::native_path(char *path) { 4525 char *src = path, *dst = path, *end = path; 4526 char *colon = NULL; // If a drive specifier is found, this will 4527 // point to the colon following the drive letter 4528 4529 // Assumption: '/', '\\', ':', and drive letters are never lead bytes 4530 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\')) 4531 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte"); 4532 4533 // Check for leading separators 4534 #define isfilesep(c) ((c) == '/' || (c) == '\\') 4535 while (isfilesep(*src)) { 4536 src++; 4537 } 4538 4539 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 4540 // Remove leading separators if followed by drive specifier. This 4541 // hack is necessary to support file URLs containing drive 4542 // specifiers (e.g., "file://c:/path"). As a side effect, 4543 // "/c:/path" can be used as an alternative to "c:/path". 4544 *dst++ = *src++; 4545 colon = dst; 4546 *dst++ = ':'; 4547 src++; 4548 } else { 4549 src = path; 4550 if (isfilesep(src[0]) && isfilesep(src[1])) { 4551 // UNC pathname: Retain first separator; leave src pointed at 4552 // second separator so that further separators will be collapsed 4553 // into the second separator. The result will be a pathname 4554 // beginning with "\\\\" followed (most likely) by a host name. 4555 src = dst = path + 1; 4556 path[0] = '\\'; // Force first separator to '\\' 4557 } 4558 } 4559 4560 end = dst; 4561 4562 // Remove redundant separators from remainder of path, forcing all 4563 // separators to be '\\' rather than '/'. Also, single byte space 4564 // characters are removed from the end of the path because those 4565 // are not legal ending characters on this operating system. 4566 // 4567 while (*src != '\0') { 4568 if (isfilesep(*src)) { 4569 *dst++ = '\\'; src++; 4570 while (isfilesep(*src)) src++; 4571 if (*src == '\0') { 4572 // Check for trailing separator 4573 end = dst; 4574 if (colon == dst - 2) break; // "z:\\" 4575 if (dst == path + 1) break; // "\\" 4576 if (dst == path + 2 && isfilesep(path[0])) { 4577 // "\\\\" is not collapsed to "\\" because "\\\\" marks the 4578 // beginning of a UNC pathname. Even though it is not, by 4579 // itself, a valid UNC pathname, we leave it as is in order 4580 // to be consistent with the path canonicalizer as well 4581 // as the win32 APIs, which treat this case as an invalid 4582 // UNC pathname rather than as an alias for the root 4583 // directory of the current drive. 4584 break; 4585 } 4586 end = --dst; // Path does not denote a root directory, so 4587 // remove trailing separator 4588 break; 4589 } 4590 end = dst; 4591 } else { 4592 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character 4593 *dst++ = *src++; 4594 if (*src) *dst++ = *src++; 4595 end = dst; 4596 } else { // Copy a single-byte character 4597 char c = *src++; 4598 *dst++ = c; 4599 // Space is not a legal ending character 4600 if (c != ' ') end = dst; 4601 } 4602 } 4603 } 4604 4605 *end = '\0'; 4606 4607 // For "z:", add "." to work around a bug in the C runtime library 4608 if (colon == dst - 1) { 4609 path[2] = '.'; 4610 path[3] = '\0'; 4611 } 4612 4613 return path; 4614 } 4615 4616 // This code is a copy of JDK's sysSetLength 4617 // from src/windows/hpi/src/sys_api_md.c 4618 4619 int os::ftruncate(int fd, jlong length) { 4620 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4621 long high = (long)(length >> 32); 4622 DWORD ret; 4623 4624 if (h == (HANDLE)(-1)) { 4625 return -1; 4626 } 4627 4628 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 4629 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 4630 return -1; 4631 } 4632 4633 if (::SetEndOfFile(h) == FALSE) { 4634 return -1; 4635 } 4636 4637 return 0; 4638 } 4639 4640 int os::get_fileno(FILE* fp) { 4641 return _fileno(fp); 4642 } 4643 4644 // This code is a copy of JDK's sysSync 4645 // from src/windows/hpi/src/sys_api_md.c 4646 // except for the legacy workaround for a bug in Win 98 4647 4648 int os::fsync(int fd) { 4649 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 4650 4651 if ((!::FlushFileBuffers(handle)) && 4652 (GetLastError() != ERROR_ACCESS_DENIED)) { 4653 // from winerror.h 4654 return -1; 4655 } 4656 return 0; 4657 } 4658 4659 static int nonSeekAvailable(int, long *); 4660 static int stdinAvailable(int, long *); 4661 4662 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR) 4663 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO) 4664 4665 // This code is a copy of JDK's sysAvailable 4666 // from src/windows/hpi/src/sys_api_md.c 4667 4668 int os::available(int fd, jlong *bytes) { 4669 jlong cur, end; 4670 struct _stati64 stbuf64; 4671 4672 if (::_fstati64(fd, &stbuf64) >= 0) { 4673 int mode = stbuf64.st_mode; 4674 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 4675 int ret; 4676 long lpbytes; 4677 if (fd == 0) { 4678 ret = stdinAvailable(fd, &lpbytes); 4679 } else { 4680 ret = nonSeekAvailable(fd, &lpbytes); 4681 } 4682 (*bytes) = (jlong)(lpbytes); 4683 return ret; 4684 } 4685 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 4686 return FALSE; 4687 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 4688 return FALSE; 4689 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 4690 return FALSE; 4691 } 4692 *bytes = end - cur; 4693 return TRUE; 4694 } else { 4695 return FALSE; 4696 } 4697 } 4698 4699 void os::flockfile(FILE* fp) { 4700 _lock_file(fp); 4701 } 4702 4703 void os::funlockfile(FILE* fp) { 4704 _unlock_file(fp); 4705 } 4706 4707 // This code is a copy of JDK's nonSeekAvailable 4708 // from src/windows/hpi/src/sys_api_md.c 4709 4710 static int nonSeekAvailable(int fd, long *pbytes) { 4711 // This is used for available on non-seekable devices 4712 // (like both named and anonymous pipes, such as pipes 4713 // connected to an exec'd process). 4714 // Standard Input is a special case. 4715 HANDLE han; 4716 4717 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 4718 return FALSE; 4719 } 4720 4721 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 4722 // PeekNamedPipe fails when at EOF. In that case we 4723 // simply make *pbytes = 0 which is consistent with the 4724 // behavior we get on Solaris when an fd is at EOF. 4725 // The only alternative is to raise an Exception, 4726 // which isn't really warranted. 4727 // 4728 if (::GetLastError() != ERROR_BROKEN_PIPE) { 4729 return FALSE; 4730 } 4731 *pbytes = 0; 4732 } 4733 return TRUE; 4734 } 4735 4736 #define MAX_INPUT_EVENTS 2000 4737 4738 // This code is a copy of JDK's stdinAvailable 4739 // from src/windows/hpi/src/sys_api_md.c 4740 4741 static int stdinAvailable(int fd, long *pbytes) { 4742 HANDLE han; 4743 DWORD numEventsRead = 0; // Number of events read from buffer 4744 DWORD numEvents = 0; // Number of events in buffer 4745 DWORD i = 0; // Loop index 4746 DWORD curLength = 0; // Position marker 4747 DWORD actualLength = 0; // Number of bytes readable 4748 BOOL error = FALSE; // Error holder 4749 INPUT_RECORD *lpBuffer; // Pointer to records of input events 4750 4751 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4752 return FALSE; 4753 } 4754 4755 // Construct an array of input records in the console buffer 4756 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4757 if (error == 0) { 4758 return nonSeekAvailable(fd, pbytes); 4759 } 4760 4761 // lpBuffer must fit into 64K or else PeekConsoleInput fails 4762 if (numEvents > MAX_INPUT_EVENTS) { 4763 numEvents = MAX_INPUT_EVENTS; 4764 } 4765 4766 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal); 4767 if (lpBuffer == NULL) { 4768 return FALSE; 4769 } 4770 4771 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4772 if (error == 0) { 4773 os::free(lpBuffer); 4774 return FALSE; 4775 } 4776 4777 // Examine input records for the number of bytes available 4778 for (i=0; i<numEvents; i++) { 4779 if (lpBuffer[i].EventType == KEY_EVENT) { 4780 4781 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4782 &(lpBuffer[i].Event); 4783 if (keyRecord->bKeyDown == TRUE) { 4784 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4785 curLength++; 4786 if (*keyPressed == '\r') { 4787 actualLength = curLength; 4788 } 4789 } 4790 } 4791 } 4792 4793 if (lpBuffer != NULL) { 4794 os::free(lpBuffer); 4795 } 4796 4797 *pbytes = (long) actualLength; 4798 return TRUE; 4799 } 4800 4801 // Map a block of memory. 4802 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4803 char *addr, size_t bytes, bool read_only, 4804 bool allow_exec) { 4805 HANDLE hFile; 4806 char* base; 4807 4808 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4809 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4810 if (hFile == NULL) { 4811 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError()); 4812 return NULL; 4813 } 4814 4815 if (allow_exec) { 4816 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4817 // unless it comes from a PE image (which the shared archive is not.) 4818 // Even VirtualProtect refuses to give execute access to mapped memory 4819 // that was not previously executable. 4820 // 4821 // Instead, stick the executable region in anonymous memory. Yuck. 4822 // Penalty is that ~4 pages will not be shareable - in the future 4823 // we might consider DLLizing the shared archive with a proper PE 4824 // header so that mapping executable + sharing is possible. 4825 4826 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4827 PAGE_READWRITE); 4828 if (base == NULL) { 4829 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError()); 4830 CloseHandle(hFile); 4831 return NULL; 4832 } 4833 4834 DWORD bytes_read; 4835 OVERLAPPED overlapped; 4836 overlapped.Offset = (DWORD)file_offset; 4837 overlapped.OffsetHigh = 0; 4838 overlapped.hEvent = NULL; 4839 // ReadFile guarantees that if the return value is true, the requested 4840 // number of bytes were read before returning. 4841 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 4842 if (!res) { 4843 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError()); 4844 release_memory(base, bytes); 4845 CloseHandle(hFile); 4846 return NULL; 4847 } 4848 } else { 4849 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 4850 NULL /* file_name */); 4851 if (hMap == NULL) { 4852 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError()); 4853 CloseHandle(hFile); 4854 return NULL; 4855 } 4856 4857 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 4858 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 4859 (DWORD)bytes, addr); 4860 if (base == NULL) { 4861 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError()); 4862 CloseHandle(hMap); 4863 CloseHandle(hFile); 4864 return NULL; 4865 } 4866 4867 if (CloseHandle(hMap) == 0) { 4868 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError()); 4869 CloseHandle(hFile); 4870 return base; 4871 } 4872 } 4873 4874 if (allow_exec) { 4875 DWORD old_protect; 4876 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 4877 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 4878 4879 if (!res) { 4880 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError()); 4881 // Don't consider this a hard error, on IA32 even if the 4882 // VirtualProtect fails, we should still be able to execute 4883 CloseHandle(hFile); 4884 return base; 4885 } 4886 } 4887 4888 if (CloseHandle(hFile) == 0) { 4889 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError()); 4890 return base; 4891 } 4892 4893 return base; 4894 } 4895 4896 4897 // Remap a block of memory. 4898 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4899 char *addr, size_t bytes, bool read_only, 4900 bool allow_exec) { 4901 // This OS does not allow existing memory maps to be remapped so we 4902 // have to unmap the memory before we remap it. 4903 if (!os::unmap_memory(addr, bytes)) { 4904 return NULL; 4905 } 4906 4907 // There is a very small theoretical window between the unmap_memory() 4908 // call above and the map_memory() call below where a thread in native 4909 // code may be able to access an address that is no longer mapped. 4910 4911 return os::map_memory(fd, file_name, file_offset, addr, bytes, 4912 read_only, allow_exec); 4913 } 4914 4915 4916 // Unmap a block of memory. 4917 // Returns true=success, otherwise false. 4918 4919 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4920 MEMORY_BASIC_INFORMATION mem_info; 4921 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) { 4922 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError()); 4923 return false; 4924 } 4925 4926 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx. 4927 // Instead, executable region was allocated using VirtualAlloc(). See 4928 // pd_map_memory() above. 4929 // 4930 // The following flags should match the 'exec_access' flages used for 4931 // VirtualProtect() in pd_map_memory(). 4932 if (mem_info.Protect == PAGE_EXECUTE_READ || 4933 mem_info.Protect == PAGE_EXECUTE_READWRITE) { 4934 return pd_release_memory(addr, bytes); 4935 } 4936 4937 BOOL result = UnmapViewOfFile(addr); 4938 if (result == 0) { 4939 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError()); 4940 return false; 4941 } 4942 return true; 4943 } 4944 4945 void os::pause() { 4946 char filename[MAX_PATH]; 4947 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4948 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4949 } else { 4950 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4951 } 4952 4953 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4954 if (fd != -1) { 4955 struct stat buf; 4956 ::close(fd); 4957 while (::stat(filename, &buf) == 0) { 4958 Sleep(100); 4959 } 4960 } else { 4961 jio_fprintf(stderr, 4962 "Could not open pause file '%s', continuing immediately.\n", filename); 4963 } 4964 } 4965 4966 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 4967 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 4968 } 4969 4970 // See the caveats for this class in os_windows.hpp 4971 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back 4972 // into this method and returns false. If no OS EXCEPTION was raised, returns 4973 // true. 4974 // The callback is supposed to provide the method that should be protected. 4975 // 4976 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 4977 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); 4978 assert(!WatcherThread::watcher_thread()->has_crash_protection(), 4979 "crash_protection already set?"); 4980 4981 bool success = true; 4982 __try { 4983 WatcherThread::watcher_thread()->set_crash_protection(this); 4984 cb.call(); 4985 } __except(EXCEPTION_EXECUTE_HANDLER) { 4986 // only for protection, nothing to do 4987 success = false; 4988 } 4989 WatcherThread::watcher_thread()->set_crash_protection(NULL); 4990 return success; 4991 } 4992 4993 // An Event wraps a win32 "CreateEvent" kernel handle. 4994 // 4995 // We have a number of choices regarding "CreateEvent" win32 handle leakage: 4996 // 4997 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 4998 // field, and call CloseHandle() on the win32 event handle. Unpark() would 4999 // need to be modified to tolerate finding a NULL (invalid) win32 event handle. 5000 // In addition, an unpark() operation might fetch the handle field, but the 5001 // event could recycle between the fetch and the SetEvent() operation. 5002 // SetEvent() would either fail because the handle was invalid, or inadvertently work, 5003 // as the win32 handle value had been recycled. In an ideal world calling SetEvent() 5004 // on an stale but recycled handle would be harmless, but in practice this might 5005 // confuse other non-Sun code, so it's not a viable approach. 5006 // 5007 // 2: Once a win32 event handle is associated with an Event, it remains associated 5008 // with the Event. The event handle is never closed. This could be construed 5009 // as handle leakage, but only up to the maximum # of threads that have been extant 5010 // at any one time. This shouldn't be an issue, as windows platforms typically 5011 // permit a process to have hundreds of thousands of open handles. 5012 // 5013 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 5014 // and release unused handles. 5015 // 5016 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 5017 // It's not clear, however, that we wouldn't be trading one type of leak for another. 5018 // 5019 // 5. Use an RCU-like mechanism (Read-Copy Update). 5020 // Or perhaps something similar to Maged Michael's "Hazard pointers". 5021 // 5022 // We use (2). 5023 // 5024 // TODO-FIXME: 5025 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 5026 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 5027 // to recover from (or at least detect) the dreaded Windows 841176 bug. 5028 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 5029 // into a single win32 CreateEvent() handle. 5030 // 5031 // Assumption: 5032 // Only one parker can exist on an event, which is why we allocate 5033 // them per-thread. Multiple unparkers can coexist. 5034 // 5035 // _Event transitions in park() 5036 // -1 => -1 : illegal 5037 // 1 => 0 : pass - return immediately 5038 // 0 => -1 : block; then set _Event to 0 before returning 5039 // 5040 // _Event transitions in unpark() 5041 // 0 => 1 : just return 5042 // 1 => 1 : just return 5043 // -1 => either 0 or 1; must signal target thread 5044 // That is, we can safely transition _Event from -1 to either 5045 // 0 or 1. 5046 // 5047 // _Event serves as a restricted-range semaphore. 5048 // -1 : thread is blocked, i.e. there is a waiter 5049 // 0 : neutral: thread is running or ready, 5050 // could have been signaled after a wait started 5051 // 1 : signaled - thread is running or ready 5052 // 5053 // Another possible encoding of _Event would be with 5054 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5055 // 5056 5057 int os::PlatformEvent::park(jlong Millis) { 5058 // Transitions for _Event: 5059 // -1 => -1 : illegal 5060 // 1 => 0 : pass - return immediately 5061 // 0 => -1 : block; then set _Event to 0 before returning 5062 5063 guarantee(_ParkHandle != NULL , "Invariant"); 5064 guarantee(Millis > 0 , "Invariant"); 5065 5066 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 5067 // the initial park() operation. 5068 // Consider: use atomic decrement instead of CAS-loop 5069 5070 int v; 5071 for (;;) { 5072 v = _Event; 5073 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5074 } 5075 guarantee((v == 0) || (v == 1), "invariant"); 5076 if (v != 0) return OS_OK; 5077 5078 // Do this the hard way by blocking ... 5079 // TODO: consider a brief spin here, gated on the success of recent 5080 // spin attempts by this thread. 5081 // 5082 // We decompose long timeouts into series of shorter timed waits. 5083 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 5084 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 5085 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 5086 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 5087 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 5088 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 5089 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 5090 // for the already waited time. This policy does not admit any new outcomes. 5091 // In the future, however, we might want to track the accumulated wait time and 5092 // adjust Millis accordingly if we encounter a spurious wakeup. 5093 5094 const int MAXTIMEOUT = 0x10000000; 5095 DWORD rv = WAIT_TIMEOUT; 5096 while (_Event < 0 && Millis > 0) { 5097 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT) 5098 if (Millis > MAXTIMEOUT) { 5099 prd = MAXTIMEOUT; 5100 } 5101 rv = ::WaitForSingleObject(_ParkHandle, prd); 5102 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed"); 5103 if (rv == WAIT_TIMEOUT) { 5104 Millis -= prd; 5105 } 5106 } 5107 v = _Event; 5108 _Event = 0; 5109 // see comment at end of os::PlatformEvent::park() below: 5110 OrderAccess::fence(); 5111 // If we encounter a nearly simultanous timeout expiry and unpark() 5112 // we return OS_OK indicating we awoke via unpark(). 5113 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 5114 return (v >= 0) ? OS_OK : OS_TIMEOUT; 5115 } 5116 5117 void os::PlatformEvent::park() { 5118 // Transitions for _Event: 5119 // -1 => -1 : illegal 5120 // 1 => 0 : pass - return immediately 5121 // 0 => -1 : block; then set _Event to 0 before returning 5122 5123 guarantee(_ParkHandle != NULL, "Invariant"); 5124 // Invariant: Only the thread associated with the Event/PlatformEvent 5125 // may call park(). 5126 // Consider: use atomic decrement instead of CAS-loop 5127 int v; 5128 for (;;) { 5129 v = _Event; 5130 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5131 } 5132 guarantee((v == 0) || (v == 1), "invariant"); 5133 if (v != 0) return; 5134 5135 // Do this the hard way by blocking ... 5136 // TODO: consider a brief spin here, gated on the success of recent 5137 // spin attempts by this thread. 5138 while (_Event < 0) { 5139 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE); 5140 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed"); 5141 } 5142 5143 // Usually we'll find _Event == 0 at this point, but as 5144 // an optional optimization we clear it, just in case can 5145 // multiple unpark() operations drove _Event up to 1. 5146 _Event = 0; 5147 OrderAccess::fence(); 5148 guarantee(_Event >= 0, "invariant"); 5149 } 5150 5151 void os::PlatformEvent::unpark() { 5152 guarantee(_ParkHandle != NULL, "Invariant"); 5153 5154 // Transitions for _Event: 5155 // 0 => 1 : just return 5156 // 1 => 1 : just return 5157 // -1 => either 0 or 1; must signal target thread 5158 // That is, we can safely transition _Event from -1 to either 5159 // 0 or 1. 5160 // See also: "Semaphores in Plan 9" by Mullender & Cox 5161 // 5162 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5163 // that it will take two back-to-back park() calls for the owning 5164 // thread to block. This has the benefit of forcing a spurious return 5165 // from the first park() call after an unpark() call which will help 5166 // shake out uses of park() and unpark() without condition variables. 5167 5168 if (Atomic::xchg(1, &_Event) >= 0) return; 5169 5170 ::SetEvent(_ParkHandle); 5171 } 5172 5173 5174 // JSR166 5175 // ------------------------------------------------------- 5176 5177 // The Windows implementation of Park is very straightforward: Basic 5178 // operations on Win32 Events turn out to have the right semantics to 5179 // use them directly. We opportunistically resuse the event inherited 5180 // from Monitor. 5181 5182 void Parker::park(bool isAbsolute, jlong time) { 5183 guarantee(_ParkEvent != NULL, "invariant"); 5184 // First, demultiplex/decode time arguments 5185 if (time < 0) { // don't wait 5186 return; 5187 } else if (time == 0 && !isAbsolute) { 5188 time = INFINITE; 5189 } else if (isAbsolute) { 5190 time -= os::javaTimeMillis(); // convert to relative time 5191 if (time <= 0) { // already elapsed 5192 return; 5193 } 5194 } else { // relative 5195 time /= 1000000; // Must coarsen from nanos to millis 5196 if (time == 0) { // Wait for the minimal time unit if zero 5197 time = 1; 5198 } 5199 } 5200 5201 JavaThread* thread = JavaThread::current(); 5202 5203 // Don't wait if interrupted or already triggered 5204 if (Thread::is_interrupted(thread, false) || 5205 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 5206 ResetEvent(_ParkEvent); 5207 return; 5208 } else { 5209 ThreadBlockInVM tbivm(thread); 5210 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5211 thread->set_suspend_equivalent(); 5212 5213 WaitForSingleObject(_ParkEvent, time); 5214 ResetEvent(_ParkEvent); 5215 5216 // If externally suspended while waiting, re-suspend 5217 if (thread->handle_special_suspend_equivalent_condition()) { 5218 thread->java_suspend_self(); 5219 } 5220 } 5221 } 5222 5223 void Parker::unpark() { 5224 guarantee(_ParkEvent != NULL, "invariant"); 5225 SetEvent(_ParkEvent); 5226 } 5227 5228 // Run the specified command in a separate process. Return its exit value, 5229 // or -1 on failure (e.g. can't create a new process). 5230 int os::fork_and_exec(char* cmd) { 5231 STARTUPINFO si; 5232 PROCESS_INFORMATION pi; 5233 5234 memset(&si, 0, sizeof(si)); 5235 si.cb = sizeof(si); 5236 memset(&pi, 0, sizeof(pi)); 5237 BOOL rslt = CreateProcess(NULL, // executable name - use command line 5238 cmd, // command line 5239 NULL, // process security attribute 5240 NULL, // thread security attribute 5241 TRUE, // inherits system handles 5242 0, // no creation flags 5243 NULL, // use parent's environment block 5244 NULL, // use parent's starting directory 5245 &si, // (in) startup information 5246 &pi); // (out) process information 5247 5248 if (rslt) { 5249 // Wait until child process exits. 5250 WaitForSingleObject(pi.hProcess, INFINITE); 5251 5252 DWORD exit_code; 5253 GetExitCodeProcess(pi.hProcess, &exit_code); 5254 5255 // Close process and thread handles. 5256 CloseHandle(pi.hProcess); 5257 CloseHandle(pi.hThread); 5258 5259 return (int)exit_code; 5260 } else { 5261 return -1; 5262 } 5263 } 5264 5265 //-------------------------------------------------------------------------------------------------- 5266 // Non-product code 5267 5268 static int mallocDebugIntervalCounter = 0; 5269 static int mallocDebugCounter = 0; 5270 5271 // For debugging possible bugs inside HeapWalk (a ring buffer) 5272 #define SAVE_COUNT 8 5273 static PROCESS_HEAP_ENTRY saved_heap_entries[SAVE_COUNT]; 5274 static int saved_heap_entry_index; 5275 5276 bool os::check_heap(bool force) { 5277 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 5278 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 5279 // Note: HeapValidate executes two hardware breakpoints when it finds something 5280 // wrong; at these points, eax contains the address of the offending block (I think). 5281 // To get to the exlicit error message(s) below, just continue twice. 5282 // 5283 // Note: we want to check the CRT heap, which is not necessarily located in the 5284 // process default heap. 5285 HANDLE heap = (HANDLE) _get_heap_handle(); 5286 if (!heap) { 5287 return true; 5288 } 5289 5290 // If we fail to lock the heap, then gflags.exe has been used 5291 // or some other special heap flag has been set that prevents 5292 // locking. We don't try to walk a heap we can't lock. 5293 if (HeapLock(heap) != 0) { 5294 PROCESS_HEAP_ENTRY phe; 5295 phe.lpData = NULL; 5296 memset(saved_heap_entries, 0, sizeof(saved_heap_entries)); 5297 saved_heap_entry_index = 0; 5298 int count = 0; 5299 5300 while (HeapWalk(heap, &phe) != 0) { 5301 count ++; 5302 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 5303 !HeapValidate(heap, 0, phe.lpData)) { 5304 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 5305 tty->print_cr("corrupted block near address %#x, length %d, count %d", phe.lpData, phe.cbData, count); 5306 HeapUnlock(heap); 5307 fatal("corrupted C heap"); 5308 } else { 5309 // Save previous seen entries in a ring buffer. We have seen strange 5310 // heap corruption fatal errors that produced mdmp files, but when we load 5311 // these mdmp files in WinDBG, "!heap -triage" shows no error. 5312 // We can examine the saved_heap_entries[] array in the mdmp file to 5313 // diagnose such seemingly spurious errors reported by HeapWalk. 5314 saved_heap_entries[saved_heap_entry_index++] = phe; 5315 if (saved_heap_entry_index >= SAVE_COUNT) { 5316 saved_heap_entry_index = 0; 5317 } 5318 } 5319 } 5320 DWORD err = GetLastError(); 5321 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED && 5322 (err == ERROR_INVALID_FUNCTION && phe.lpData != NULL)) { 5323 HeapUnlock(heap); 5324 fatal("heap walk aborted with error %d", err); 5325 } 5326 HeapUnlock(heap); 5327 } 5328 mallocDebugIntervalCounter = 0; 5329 } 5330 return true; 5331 } 5332 5333 5334 bool os::find(address addr, outputStream* st) { 5335 int offset = -1; 5336 bool result = false; 5337 char buf[256]; 5338 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) { 5339 st->print(PTR_FORMAT " ", addr); 5340 if (strlen(buf) < sizeof(buf) - 1) { 5341 char* p = strrchr(buf, '\\'); 5342 if (p) { 5343 st->print("%s", p + 1); 5344 } else { 5345 st->print("%s", buf); 5346 } 5347 } else { 5348 // The library name is probably truncated. Let's omit the library name. 5349 // See also JDK-8147512. 5350 } 5351 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) { 5352 st->print("::%s + 0x%x", buf, offset); 5353 } 5354 st->cr(); 5355 result = true; 5356 } 5357 return result; 5358 } 5359 5360 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 5361 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 5362 5363 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 5364 JavaThread* thread = JavaThread::current(); 5365 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 5366 address addr = (address) exceptionRecord->ExceptionInformation[1]; 5367 5368 if (os::is_memory_serialize_page(thread, addr)) { 5369 return EXCEPTION_CONTINUE_EXECUTION; 5370 } 5371 } 5372 5373 return EXCEPTION_CONTINUE_SEARCH; 5374 } 5375 5376 // We don't build a headless jre for Windows 5377 bool os::is_headless_jre() { return false; } 5378 5379 static jint initSock() { 5380 WSADATA wsadata; 5381 5382 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) { 5383 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n", 5384 ::GetLastError()); 5385 return JNI_ERR; 5386 } 5387 return JNI_OK; 5388 } 5389 5390 struct hostent* os::get_host_by_name(char* name) { 5391 return (struct hostent*)gethostbyname(name); 5392 } 5393 5394 int os::socket_close(int fd) { 5395 return ::closesocket(fd); 5396 } 5397 5398 int os::socket(int domain, int type, int protocol) { 5399 return ::socket(domain, type, protocol); 5400 } 5401 5402 int os::connect(int fd, struct sockaddr* him, socklen_t len) { 5403 return ::connect(fd, him, len); 5404 } 5405 5406 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5407 return ::recv(fd, buf, (int)nBytes, flags); 5408 } 5409 5410 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5411 return ::send(fd, buf, (int)nBytes, flags); 5412 } 5413 5414 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5415 return ::send(fd, buf, (int)nBytes, flags); 5416 } 5417 5418 // WINDOWS CONTEXT Flags for THREAD_SAMPLING 5419 #if defined(IA32) 5420 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS) 5421 #elif defined (AMD64) 5422 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT) 5423 #endif 5424 5425 // returns true if thread could be suspended, 5426 // false otherwise 5427 static bool do_suspend(HANDLE* h) { 5428 if (h != NULL) { 5429 if (SuspendThread(*h) != ~0) { 5430 return true; 5431 } 5432 } 5433 return false; 5434 } 5435 5436 // resume the thread 5437 // calling resume on an active thread is a no-op 5438 static void do_resume(HANDLE* h) { 5439 if (h != NULL) { 5440 ResumeThread(*h); 5441 } 5442 } 5443 5444 // retrieve a suspend/resume context capable handle 5445 // from the tid. Caller validates handle return value. 5446 void get_thread_handle_for_extended_context(HANDLE* h, 5447 OSThread::thread_id_t tid) { 5448 if (h != NULL) { 5449 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid); 5450 } 5451 } 5452 5453 // Thread sampling implementation 5454 // 5455 void os::SuspendedThreadTask::internal_do_task() { 5456 CONTEXT ctxt; 5457 HANDLE h = NULL; 5458 5459 // get context capable handle for thread 5460 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id()); 5461 5462 // sanity 5463 if (h == NULL || h == INVALID_HANDLE_VALUE) { 5464 return; 5465 } 5466 5467 // suspend the thread 5468 if (do_suspend(&h)) { 5469 ctxt.ContextFlags = sampling_context_flags; 5470 // get thread context 5471 GetThreadContext(h, &ctxt); 5472 SuspendedThreadTaskContext context(_thread, &ctxt); 5473 // pass context to Thread Sampling impl 5474 do_task(context); 5475 // resume thread 5476 do_resume(&h); 5477 } 5478 5479 // close handle 5480 CloseHandle(h); 5481 } 5482 5483 bool os::start_debugging(char *buf, int buflen) { 5484 int len = (int)strlen(buf); 5485 char *p = &buf[len]; 5486 5487 jio_snprintf(p, buflen-len, 5488 "\n\n" 5489 "Do you want to debug the problem?\n\n" 5490 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n" 5491 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n" 5492 "Otherwise, select 'No' to abort...", 5493 os::current_process_id(), os::current_thread_id()); 5494 5495 bool yes = os::message_box("Unexpected Error", buf); 5496 5497 if (yes) { 5498 // os::breakpoint() calls DebugBreak(), which causes a breakpoint 5499 // exception. If VM is running inside a debugger, the debugger will 5500 // catch the exception. Otherwise, the breakpoint exception will reach 5501 // the default windows exception handler, which can spawn a debugger and 5502 // automatically attach to the dying VM. 5503 os::breakpoint(); 5504 yes = false; 5505 } 5506 return yes; 5507 } 5508 5509 void* os::get_default_process_handle() { 5510 return (void*)GetModuleHandle(NULL); 5511 } 5512 5513 // Builds a platform dependent Agent_OnLoad_<lib_name> function name 5514 // which is used to find statically linked in agents. 5515 // Additionally for windows, takes into account __stdcall names. 5516 // Parameters: 5517 // sym_name: Symbol in library we are looking for 5518 // lib_name: Name of library to look in, NULL for shared libs. 5519 // is_absolute_path == true if lib_name is absolute path to agent 5520 // such as "C:/a/b/L.dll" 5521 // == false if only the base name of the library is passed in 5522 // such as "L" 5523 char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 5524 bool is_absolute_path) { 5525 char *agent_entry_name; 5526 size_t len; 5527 size_t name_len; 5528 size_t prefix_len = strlen(JNI_LIB_PREFIX); 5529 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 5530 const char *start; 5531 5532 if (lib_name != NULL) { 5533 len = name_len = strlen(lib_name); 5534 if (is_absolute_path) { 5535 // Need to strip path, prefix and suffix 5536 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 5537 lib_name = ++start; 5538 } else { 5539 // Need to check for drive prefix 5540 if ((start = strchr(lib_name, ':')) != NULL) { 5541 lib_name = ++start; 5542 } 5543 } 5544 if (len <= (prefix_len + suffix_len)) { 5545 return NULL; 5546 } 5547 lib_name += prefix_len; 5548 name_len = strlen(lib_name) - suffix_len; 5549 } 5550 } 5551 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 5552 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 5553 if (agent_entry_name == NULL) { 5554 return NULL; 5555 } 5556 if (lib_name != NULL) { 5557 const char *p = strrchr(sym_name, '@'); 5558 if (p != NULL && p != sym_name) { 5559 // sym_name == _Agent_OnLoad@XX 5560 strncpy(agent_entry_name, sym_name, (p - sym_name)); 5561 agent_entry_name[(p-sym_name)] = '\0'; 5562 // agent_entry_name == _Agent_OnLoad 5563 strcat(agent_entry_name, "_"); 5564 strncat(agent_entry_name, lib_name, name_len); 5565 strcat(agent_entry_name, p); 5566 // agent_entry_name == _Agent_OnLoad_lib_name@XX 5567 } else { 5568 strcpy(agent_entry_name, sym_name); 5569 strcat(agent_entry_name, "_"); 5570 strncat(agent_entry_name, lib_name, name_len); 5571 } 5572 } else { 5573 strcpy(agent_entry_name, sym_name); 5574 } 5575 return agent_entry_name; 5576 } 5577 5578 #ifndef PRODUCT 5579 5580 // test the code path in reserve_memory_special() that tries to allocate memory in a single 5581 // contiguous memory block at a particular address. 5582 // The test first tries to find a good approximate address to allocate at by using the same 5583 // method to allocate some memory at any address. The test then tries to allocate memory in 5584 // the vicinity (not directly after it to avoid possible by-chance use of that location) 5585 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of 5586 // the previously allocated memory is available for allocation. The only actual failure 5587 // that is reported is when the test tries to allocate at a particular location but gets a 5588 // different valid one. A NULL return value at this point is not considered an error but may 5589 // be legitimate. 5590 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages. 5591 void TestReserveMemorySpecial_test() { 5592 if (!UseLargePages) { 5593 if (VerboseInternalVMTests) { 5594 tty->print("Skipping test because large pages are disabled"); 5595 } 5596 return; 5597 } 5598 // save current value of globals 5599 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; 5600 bool old_use_numa_interleaving = UseNUMAInterleaving; 5601 5602 // set globals to make sure we hit the correct code path 5603 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; 5604 5605 // do an allocation at an address selected by the OS to get a good one. 5606 const size_t large_allocation_size = os::large_page_size() * 4; 5607 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); 5608 if (result == NULL) { 5609 if (VerboseInternalVMTests) { 5610 tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.", 5611 large_allocation_size); 5612 } 5613 } else { 5614 os::release_memory_special(result, large_allocation_size); 5615 5616 // allocate another page within the recently allocated memory area which seems to be a good location. At least 5617 // we managed to get it once. 5618 const size_t expected_allocation_size = os::large_page_size(); 5619 char* expected_location = result + os::large_page_size(); 5620 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); 5621 if (actual_location == NULL) { 5622 if (VerboseInternalVMTests) { 5623 tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.", 5624 expected_location, large_allocation_size); 5625 } 5626 } else { 5627 // release memory 5628 os::release_memory_special(actual_location, expected_allocation_size); 5629 // only now check, after releasing any memory to avoid any leaks. 5630 assert(actual_location == expected_location, 5631 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead", 5632 expected_location, expected_allocation_size, actual_location); 5633 } 5634 } 5635 5636 // restore globals 5637 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; 5638 UseNUMAInterleaving = old_use_numa_interleaving; 5639 } 5640 #endif // PRODUCT 5641 5642 /* 5643 All the defined signal names for Windows. 5644 5645 NOTE that not all of these names are accepted by FindSignal! 5646 5647 For various reasons some of these may be rejected at runtime. 5648 5649 Here are the names currently accepted by a user of sun.misc.Signal with 5650 1.4.1 (ignoring potential interaction with use of chaining, etc): 5651 5652 (LIST TBD) 5653 5654 */ 5655 int os::get_signal_number(const char* name) { 5656 static const struct { 5657 char* name; 5658 int number; 5659 } siglabels [] = 5660 // derived from version 6.0 VC98/include/signal.h 5661 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl 5662 "FPE", SIGFPE, // floating point exception 5663 "SEGV", SIGSEGV, // segment violation 5664 "INT", SIGINT, // interrupt 5665 "TERM", SIGTERM, // software term signal from kill 5666 "BREAK", SIGBREAK, // Ctrl-Break sequence 5667 "ILL", SIGILL}; // illegal instruction 5668 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) { 5669 if (strcmp(name, siglabels[i].name) == 0) { 5670 return siglabels[i].number; 5671 } 5672 } 5673 return -1; 5674 } 5675 5676 // Fast current thread access 5677 5678 int os::win32::_thread_ptr_offset = 0; 5679 5680 static void call_wrapper_dummy() {} 5681 5682 // We need to call the os_exception_wrapper once so that it sets 5683 // up the offset from FS of the thread pointer. 5684 void os::win32::initialize_thread_ptr_offset() { 5685 os::os_exception_wrapper((java_call_t)call_wrapper_dummy, 5686 NULL, NULL, NULL, NULL); 5687 }