1 /* 2 * Copyright (c) 1997, 2015, 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 "memory/allocation.inline.hpp" 39 #include "memory/filemap.hpp" 40 #include "mutex_windows.inline.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "os_share_windows.hpp" 43 #include "os_windows.inline.hpp" 44 #include "prims/jniFastGetField.hpp" 45 #include "prims/jvm.h" 46 #include "prims/jvm_misc.hpp" 47 #include "runtime/arguments.hpp" 48 #include "runtime/atomic.inline.hpp" 49 #include "runtime/extendedPC.hpp" 50 #include "runtime/globals.hpp" 51 #include "runtime/interfaceSupport.hpp" 52 #include "runtime/java.hpp" 53 #include "runtime/javaCalls.hpp" 54 #include "runtime/mutexLocker.hpp" 55 #include "runtime/objectMonitor.hpp" 56 #include "runtime/orderAccess.inline.hpp" 57 #include "runtime/osThread.hpp" 58 #include "runtime/perfMemory.hpp" 59 #include "runtime/sharedRuntime.hpp" 60 #include "runtime/statSampler.hpp" 61 #include "runtime/stubRoutines.hpp" 62 #include "runtime/thread.inline.hpp" 63 #include "runtime/threadCritical.hpp" 64 #include "runtime/timer.hpp" 65 #include "runtime/vm_version.hpp" 66 #include "semaphore_windows.hpp" 67 #include "services/attachListener.hpp" 68 #include "services/memTracker.hpp" 69 #include "services/runtimeService.hpp" 70 #include "utilities/decoder.hpp" 71 #include "utilities/defaultStream.hpp" 72 #include "utilities/events.hpp" 73 #include "utilities/growableArray.hpp" 74 #include "utilities/vmError.hpp" 75 76 #ifdef _DEBUG 77 #include <crtdbg.h> 78 #endif 79 80 81 #include <windows.h> 82 #include <sys/types.h> 83 #include <sys/stat.h> 84 #include <sys/timeb.h> 85 #include <objidl.h> 86 #include <shlobj.h> 87 88 #include <malloc.h> 89 #include <signal.h> 90 #include <direct.h> 91 #include <errno.h> 92 #include <fcntl.h> 93 #include <io.h> 94 #include <process.h> // For _beginthreadex(), _endthreadex() 95 #include <imagehlp.h> // For os::dll_address_to_function_name 96 // for enumerating dll libraries 97 #include <vdmdbg.h> 98 99 // for timer info max values which include all bits 100 #define ALL_64_BITS CONST64(-1) 101 102 // For DLL loading/load error detection 103 // Values of PE COFF 104 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c 105 #define IMAGE_FILE_SIGNATURE_LENGTH 4 106 107 static HANDLE main_process; 108 static HANDLE main_thread; 109 static int main_thread_id; 110 111 static FILETIME process_creation_time; 112 static FILETIME process_exit_time; 113 static FILETIME process_user_time; 114 static FILETIME process_kernel_time; 115 116 #ifdef _M_IA64 117 #define __CPU__ ia64 118 #else 119 #ifdef _M_AMD64 120 #define __CPU__ amd64 121 #else 122 #define __CPU__ i486 123 #endif 124 #endif 125 126 // save DLL module handle, used by GetModuleFileName 127 128 HINSTANCE vm_lib_handle; 129 130 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { 131 switch (reason) { 132 case DLL_PROCESS_ATTACH: 133 vm_lib_handle = hinst; 134 if (ForceTimeHighResolution) { 135 timeBeginPeriod(1L); 136 } 137 break; 138 case DLL_PROCESS_DETACH: 139 if (ForceTimeHighResolution) { 140 timeEndPeriod(1L); 141 } 142 break; 143 default: 144 break; 145 } 146 return true; 147 } 148 149 static inline double fileTimeAsDouble(FILETIME* time) { 150 const double high = (double) ((unsigned int) ~0); 151 const double split = 10000000.0; 152 double result = (time->dwLowDateTime / split) + 153 time->dwHighDateTime * (high/split); 154 return result; 155 } 156 157 // Implementation of os 158 159 bool os::unsetenv(const char* name) { 160 assert(name != NULL, "Null pointer"); 161 return (SetEnvironmentVariable(name, NULL) == TRUE); 162 } 163 164 // No setuid programs under Windows. 165 bool os::have_special_privileges() { 166 return false; 167 } 168 169 170 // This method is a periodic task to check for misbehaving JNI applications 171 // under CheckJNI, we can add any periodic checks here. 172 // For Windows at the moment does nothing 173 void os::run_periodic_checks() { 174 return; 175 } 176 177 // previous UnhandledExceptionFilter, if there is one 178 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL; 179 180 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 181 182 void os::init_system_properties_values() { 183 // sysclasspath, java_home, dll_dir 184 { 185 char *home_path; 186 char *dll_path; 187 char *pslash; 188 char *bin = "\\bin"; 189 char home_dir[MAX_PATH + 1]; 190 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR"); 191 192 if (alt_home_dir != NULL) { 193 strncpy(home_dir, alt_home_dir, MAX_PATH + 1); 194 home_dir[MAX_PATH] = '\0'; 195 } else { 196 os::jvm_path(home_dir, sizeof(home_dir)); 197 // Found the full path to jvm.dll. 198 // Now cut the path to <java_home>/jre if we can. 199 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll 200 pslash = strrchr(home_dir, '\\'); 201 if (pslash != NULL) { 202 *pslash = '\0'; // get rid of \{client|server} 203 pslash = strrchr(home_dir, '\\'); 204 if (pslash != NULL) { 205 *pslash = '\0'; // get rid of \bin 206 } 207 } 208 } 209 210 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal); 211 if (home_path == NULL) { 212 return; 213 } 214 strcpy(home_path, home_dir); 215 Arguments::set_java_home(home_path); 216 FREE_C_HEAP_ARRAY(char, home_path); 217 218 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, 219 mtInternal); 220 if (dll_path == NULL) { 221 return; 222 } 223 strcpy(dll_path, home_dir); 224 strcat(dll_path, bin); 225 Arguments::set_dll_dir(dll_path); 226 FREE_C_HEAP_ARRAY(char, dll_path); 227 228 if (!set_boot_path('\\', ';')) { 229 return; 230 } 231 } 232 233 // library_path 234 #define EXT_DIR "\\lib\\ext" 235 #define BIN_DIR "\\bin" 236 #define PACKAGE_DIR "\\Sun\\Java" 237 { 238 // Win32 library search order (See the documentation for LoadLibrary): 239 // 240 // 1. The directory from which application is loaded. 241 // 2. The system wide Java Extensions directory (Java only) 242 // 3. System directory (GetSystemDirectory) 243 // 4. Windows directory (GetWindowsDirectory) 244 // 5. The PATH environment variable 245 // 6. The current directory 246 247 char *library_path; 248 char tmp[MAX_PATH]; 249 char *path_str = ::getenv("PATH"); 250 251 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 252 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal); 253 254 library_path[0] = '\0'; 255 256 GetModuleFileName(NULL, tmp, sizeof(tmp)); 257 *(strrchr(tmp, '\\')) = '\0'; 258 strcat(library_path, tmp); 259 260 GetWindowsDirectory(tmp, sizeof(tmp)); 261 strcat(library_path, ";"); 262 strcat(library_path, tmp); 263 strcat(library_path, PACKAGE_DIR BIN_DIR); 264 265 GetSystemDirectory(tmp, sizeof(tmp)); 266 strcat(library_path, ";"); 267 strcat(library_path, tmp); 268 269 GetWindowsDirectory(tmp, sizeof(tmp)); 270 strcat(library_path, ";"); 271 strcat(library_path, tmp); 272 273 if (path_str) { 274 strcat(library_path, ";"); 275 strcat(library_path, path_str); 276 } 277 278 strcat(library_path, ";."); 279 280 Arguments::set_library_path(library_path); 281 FREE_C_HEAP_ARRAY(char, library_path); 282 } 283 284 // Default extensions directory 285 { 286 char path[MAX_PATH]; 287 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 288 GetWindowsDirectory(path, MAX_PATH); 289 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 290 path, PACKAGE_DIR, EXT_DIR); 291 Arguments::set_ext_dirs(buf); 292 } 293 #undef EXT_DIR 294 #undef BIN_DIR 295 #undef PACKAGE_DIR 296 297 #ifndef _WIN64 298 // set our UnhandledExceptionFilter and save any previous one 299 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception); 300 #endif 301 302 // Done 303 return; 304 } 305 306 void os::breakpoint() { 307 DebugBreak(); 308 } 309 310 // Invoked from the BREAKPOINT Macro 311 extern "C" void breakpoint() { 312 os::breakpoint(); 313 } 314 315 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP. 316 // So far, this method is only used by Native Memory Tracking, which is 317 // only supported on Windows XP or later. 318 // 319 int os::get_native_stack(address* stack, int frames, int toSkip) { 320 #ifdef _NMT_NOINLINE_ 321 toSkip++; 322 #endif 323 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames, 324 (PVOID*)stack, NULL); 325 for (int index = captured; index < frames; index ++) { 326 stack[index] = NULL; 327 } 328 return captured; 329 } 330 331 332 // os::current_stack_base() 333 // 334 // Returns the base of the stack, which is the stack's 335 // starting address. This function must be called 336 // while running on the stack of the thread being queried. 337 338 address os::current_stack_base() { 339 MEMORY_BASIC_INFORMATION minfo; 340 address stack_bottom; 341 size_t stack_size; 342 343 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 344 stack_bottom = (address)minfo.AllocationBase; 345 stack_size = minfo.RegionSize; 346 347 // Add up the sizes of all the regions with the same 348 // AllocationBase. 349 while (1) { 350 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 351 if (stack_bottom == (address)minfo.AllocationBase) { 352 stack_size += minfo.RegionSize; 353 } else { 354 break; 355 } 356 } 357 358 #ifdef _M_IA64 359 // IA64 has memory and register stacks 360 // 361 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit 362 // at thread creation (1MB backing store growing upwards, 1MB memory stack 363 // growing downwards, 2MB summed up) 364 // 365 // ... 366 // ------- top of stack (high address) ----- 367 // | 368 // | 1MB 369 // | Backing Store (Register Stack) 370 // | 371 // | / \ 372 // | | 373 // | | 374 // | | 375 // ------------------------ stack base ----- 376 // | 1MB 377 // | Memory Stack 378 // | 379 // | | 380 // | | 381 // | | 382 // | \ / 383 // | 384 // ----- bottom of stack (low address) ----- 385 // ... 386 387 stack_size = stack_size / 2; 388 #endif 389 return stack_bottom + stack_size; 390 } 391 392 size_t os::current_stack_size() { 393 size_t sz; 394 MEMORY_BASIC_INFORMATION minfo; 395 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 396 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 397 return sz; 398 } 399 400 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 401 const struct tm* time_struct_ptr = localtime(clock); 402 if (time_struct_ptr != NULL) { 403 *res = *time_struct_ptr; 404 return res; 405 } 406 return NULL; 407 } 408 409 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 410 411 // Thread start routine for all new Java threads 412 static unsigned __stdcall java_start(Thread* thread) { 413 // Try to randomize the cache line index of hot stack frames. 414 // This helps when threads of the same stack traces evict each other's 415 // cache lines. The threads can be either from the same JVM instance, or 416 // from different JVM instances. The benefit is especially true for 417 // processors with hyperthreading technology. 418 static int counter = 0; 419 int pid = os::current_process_id(); 420 _alloca(((pid ^ counter++) & 7) * 128); 421 422 thread->initialize_thread_current(); 423 424 OSThread* osthr = thread->osthread(); 425 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 426 427 if (UseNUMA) { 428 int lgrp_id = os::numa_get_group_id(); 429 if (lgrp_id != -1) { 430 thread->set_lgrp_id(lgrp_id); 431 } 432 } 433 434 // Diagnostic code to investigate JDK-6573254 435 int res = 30115; // non-java thread 436 if (thread->is_Java_thread()) { 437 res = 20115; // java thread 438 } 439 440 // Install a win32 structured exception handler around every thread created 441 // by VM, so VM can generate error dump when an exception occurred in non- 442 // Java thread (e.g. VM thread). 443 __try { 444 thread->run(); 445 } __except(topLevelExceptionFilter( 446 (_EXCEPTION_POINTERS*)_exception_info())) { 447 // Nothing to do. 448 } 449 450 // One less thread is executing 451 // When the VMThread gets here, the main thread may have already exited 452 // which frees the CodeHeap containing the Atomic::add code 453 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 454 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); 455 } 456 457 // Thread must not return from exit_process_or_thread(), but if it does, 458 // let it proceed to exit normally 459 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res); 460 } 461 462 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, 463 int thread_id) { 464 // Allocate the OSThread object 465 OSThread* osthread = new OSThread(NULL, NULL); 466 if (osthread == NULL) return NULL; 467 468 // Initialize support for Java interrupts 469 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 470 if (interrupt_event == NULL) { 471 delete osthread; 472 return NULL; 473 } 474 osthread->set_interrupt_event(interrupt_event); 475 476 // Store info on the Win32 thread into the OSThread 477 osthread->set_thread_handle(thread_handle); 478 osthread->set_thread_id(thread_id); 479 480 if (UseNUMA) { 481 int lgrp_id = os::numa_get_group_id(); 482 if (lgrp_id != -1) { 483 thread->set_lgrp_id(lgrp_id); 484 } 485 } 486 487 // Initial thread state is INITIALIZED, not SUSPENDED 488 osthread->set_state(INITIALIZED); 489 490 return osthread; 491 } 492 493 494 bool os::create_attached_thread(JavaThread* thread) { 495 #ifdef ASSERT 496 thread->verify_not_published(); 497 #endif 498 HANDLE thread_h; 499 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 500 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 501 fatal("DuplicateHandle failed\n"); 502 } 503 OSThread* osthread = create_os_thread(thread, thread_h, 504 (int)current_thread_id()); 505 if (osthread == NULL) { 506 return false; 507 } 508 509 // Initial thread state is RUNNABLE 510 osthread->set_state(RUNNABLE); 511 512 thread->set_osthread(osthread); 513 return true; 514 } 515 516 bool os::create_main_thread(JavaThread* thread) { 517 #ifdef ASSERT 518 thread->verify_not_published(); 519 #endif 520 if (_starting_thread == NULL) { 521 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 522 if (_starting_thread == NULL) { 523 return false; 524 } 525 } 526 527 // The primordial thread is runnable from the start) 528 _starting_thread->set_state(RUNNABLE); 529 530 thread->set_osthread(_starting_thread); 531 return true; 532 } 533 534 // Allocate and initialize a new OSThread 535 bool os::create_thread(Thread* thread, ThreadType thr_type, 536 size_t stack_size) { 537 unsigned thread_id; 538 539 // Allocate the OSThread object 540 OSThread* osthread = new OSThread(NULL, NULL); 541 if (osthread == NULL) { 542 return false; 543 } 544 545 // Initialize support for Java interrupts 546 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 547 if (interrupt_event == NULL) { 548 delete osthread; 549 return NULL; 550 } 551 osthread->set_interrupt_event(interrupt_event); 552 osthread->set_interrupted(false); 553 554 thread->set_osthread(osthread); 555 556 if (stack_size == 0) { 557 switch (thr_type) { 558 case os::java_thread: 559 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 560 if (JavaThread::stack_size_at_create() > 0) { 561 stack_size = JavaThread::stack_size_at_create(); 562 } 563 break; 564 case os::compiler_thread: 565 if (CompilerThreadStackSize > 0) { 566 stack_size = (size_t)(CompilerThreadStackSize * K); 567 break; 568 } // else fall through: 569 // use VMThreadStackSize if CompilerThreadStackSize is not defined 570 case os::vm_thread: 571 case os::pgc_thread: 572 case os::cgc_thread: 573 case os::watcher_thread: 574 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 575 break; 576 } 577 } 578 579 // Create the Win32 thread 580 // 581 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 582 // does not specify stack size. Instead, it specifies the size of 583 // initially committed space. The stack size is determined by 584 // PE header in the executable. If the committed "stack_size" is larger 585 // than default value in the PE header, the stack is rounded up to the 586 // nearest multiple of 1MB. For example if the launcher has default 587 // stack size of 320k, specifying any size less than 320k does not 588 // affect the actual stack size at all, it only affects the initial 589 // commitment. On the other hand, specifying 'stack_size' larger than 590 // default value may cause significant increase in memory usage, because 591 // not only the stack space will be rounded up to MB, but also the 592 // entire space is committed upfront. 593 // 594 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 595 // for CreateThread() that can treat 'stack_size' as stack size. However we 596 // are not supposed to call CreateThread() directly according to MSDN 597 // document because JVM uses C runtime library. The good news is that the 598 // flag appears to work with _beginthredex() as well. 599 600 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION 601 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000) 602 #endif 603 604 HANDLE thread_handle = 605 (HANDLE)_beginthreadex(NULL, 606 (unsigned)stack_size, 607 (unsigned (__stdcall *)(void*)) java_start, 608 thread, 609 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, 610 &thread_id); 611 if (thread_handle == NULL) { 612 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again 613 // without the flag. 614 thread_handle = 615 (HANDLE)_beginthreadex(NULL, 616 (unsigned)stack_size, 617 (unsigned (__stdcall *)(void*)) java_start, 618 thread, 619 CREATE_SUSPENDED, 620 &thread_id); 621 } 622 if (thread_handle == NULL) { 623 // Need to clean up stuff we've allocated so far 624 CloseHandle(osthread->interrupt_event()); 625 thread->set_osthread(NULL); 626 delete osthread; 627 return NULL; 628 } 629 630 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); 631 632 // Store info on the Win32 thread into the OSThread 633 osthread->set_thread_handle(thread_handle); 634 osthread->set_thread_id(thread_id); 635 636 // Initial thread state is INITIALIZED, not SUSPENDED 637 osthread->set_state(INITIALIZED); 638 639 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 640 return true; 641 } 642 643 644 // Free Win32 resources related to the OSThread 645 void os::free_thread(OSThread* osthread) { 646 assert(osthread != NULL, "osthread not set"); 647 CloseHandle(osthread->thread_handle()); 648 CloseHandle(osthread->interrupt_event()); 649 delete osthread; 650 } 651 652 static jlong first_filetime; 653 static jlong initial_performance_count; 654 static jlong performance_frequency; 655 656 657 jlong as_long(LARGE_INTEGER x) { 658 jlong result = 0; // initialization to avoid warning 659 set_high(&result, x.HighPart); 660 set_low(&result, x.LowPart); 661 return result; 662 } 663 664 665 jlong os::elapsed_counter() { 666 LARGE_INTEGER count; 667 if (win32::_has_performance_count) { 668 QueryPerformanceCounter(&count); 669 return as_long(count) - initial_performance_count; 670 } else { 671 FILETIME wt; 672 GetSystemTimeAsFileTime(&wt); 673 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime); 674 } 675 } 676 677 678 jlong os::elapsed_frequency() { 679 if (win32::_has_performance_count) { 680 return performance_frequency; 681 } else { 682 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601. 683 return 10000000; 684 } 685 } 686 687 688 julong os::available_memory() { 689 return win32::available_memory(); 690 } 691 692 julong os::win32::available_memory() { 693 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 694 // value if total memory is larger than 4GB 695 MEMORYSTATUSEX ms; 696 ms.dwLength = sizeof(ms); 697 GlobalMemoryStatusEx(&ms); 698 699 return (julong)ms.ullAvailPhys; 700 } 701 702 julong os::physical_memory() { 703 return win32::physical_memory(); 704 } 705 706 bool os::has_allocatable_memory_limit(julong* limit) { 707 MEMORYSTATUSEX ms; 708 ms.dwLength = sizeof(ms); 709 GlobalMemoryStatusEx(&ms); 710 #ifdef _LP64 711 *limit = (julong)ms.ullAvailVirtual; 712 return true; 713 #else 714 // Limit to 1400m because of the 2gb address space wall 715 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual); 716 return true; 717 #endif 718 } 719 720 // VC6 lacks DWORD_PTR 721 #if _MSC_VER < 1300 722 typedef UINT_PTR DWORD_PTR; 723 #endif 724 725 int os::active_processor_count() { 726 DWORD_PTR lpProcessAffinityMask = 0; 727 DWORD_PTR lpSystemAffinityMask = 0; 728 int proc_count = processor_count(); 729 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 730 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 731 // Nof active processors is number of bits in process affinity mask 732 int bitcount = 0; 733 while (lpProcessAffinityMask != 0) { 734 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 735 bitcount++; 736 } 737 return bitcount; 738 } else { 739 return proc_count; 740 } 741 } 742 743 void os::set_native_thread_name(const char *name) { 744 745 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx 746 // 747 // Note that unfortunately this only works if the process 748 // is already attached to a debugger; debugger must observe 749 // the exception below to show the correct name. 750 751 const DWORD MS_VC_EXCEPTION = 0x406D1388; 752 struct { 753 DWORD dwType; // must be 0x1000 754 LPCSTR szName; // pointer to name (in user addr space) 755 DWORD dwThreadID; // thread ID (-1=caller thread) 756 DWORD dwFlags; // reserved for future use, must be zero 757 } info; 758 759 info.dwType = 0x1000; 760 info.szName = name; 761 info.dwThreadID = -1; 762 info.dwFlags = 0; 763 764 __try { 765 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info ); 766 } __except(EXCEPTION_CONTINUE_EXECUTION) {} 767 } 768 769 bool os::distribute_processes(uint length, uint* distribution) { 770 // Not yet implemented. 771 return false; 772 } 773 774 bool os::bind_to_processor(uint processor_id) { 775 // Not yet implemented. 776 return false; 777 } 778 779 void os::win32::initialize_performance_counter() { 780 LARGE_INTEGER count; 781 if (QueryPerformanceFrequency(&count)) { 782 win32::_has_performance_count = 1; 783 performance_frequency = as_long(count); 784 QueryPerformanceCounter(&count); 785 initial_performance_count = as_long(count); 786 } else { 787 win32::_has_performance_count = 0; 788 FILETIME wt; 789 GetSystemTimeAsFileTime(&wt); 790 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 791 } 792 } 793 794 795 double os::elapsedTime() { 796 return (double) elapsed_counter() / (double) elapsed_frequency(); 797 } 798 799 800 // Windows format: 801 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 802 // Java format: 803 // Java standards require the number of milliseconds since 1/1/1970 804 805 // Constant offset - calculated using offset() 806 static jlong _offset = 116444736000000000; 807 // Fake time counter for reproducible results when debugging 808 static jlong fake_time = 0; 809 810 #ifdef ASSERT 811 // Just to be safe, recalculate the offset in debug mode 812 static jlong _calculated_offset = 0; 813 static int _has_calculated_offset = 0; 814 815 jlong offset() { 816 if (_has_calculated_offset) return _calculated_offset; 817 SYSTEMTIME java_origin; 818 java_origin.wYear = 1970; 819 java_origin.wMonth = 1; 820 java_origin.wDayOfWeek = 0; // ignored 821 java_origin.wDay = 1; 822 java_origin.wHour = 0; 823 java_origin.wMinute = 0; 824 java_origin.wSecond = 0; 825 java_origin.wMilliseconds = 0; 826 FILETIME jot; 827 if (!SystemTimeToFileTime(&java_origin, &jot)) { 828 fatal("Error = %d\nWindows error", GetLastError()); 829 } 830 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 831 _has_calculated_offset = 1; 832 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 833 return _calculated_offset; 834 } 835 #else 836 jlong offset() { 837 return _offset; 838 } 839 #endif 840 841 jlong windows_to_java_time(FILETIME wt) { 842 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 843 return (a - offset()) / 10000; 844 } 845 846 // Returns time ticks in (10th of micro seconds) 847 jlong windows_to_time_ticks(FILETIME wt) { 848 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 849 return (a - offset()); 850 } 851 852 FILETIME java_to_windows_time(jlong l) { 853 jlong a = (l * 10000) + offset(); 854 FILETIME result; 855 result.dwHighDateTime = high(a); 856 result.dwLowDateTime = low(a); 857 return result; 858 } 859 860 bool os::supports_vtime() { return true; } 861 bool os::enable_vtime() { return false; } 862 bool os::vtime_enabled() { return false; } 863 864 double os::elapsedVTime() { 865 FILETIME created; 866 FILETIME exited; 867 FILETIME kernel; 868 FILETIME user; 869 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) { 870 // the resolution of windows_to_java_time() should be sufficient (ms) 871 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS; 872 } else { 873 return elapsedTime(); 874 } 875 } 876 877 jlong os::javaTimeMillis() { 878 if (UseFakeTimers) { 879 return fake_time++; 880 } else { 881 FILETIME wt; 882 GetSystemTimeAsFileTime(&wt); 883 return windows_to_java_time(wt); 884 } 885 } 886 887 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 888 FILETIME wt; 889 GetSystemTimeAsFileTime(&wt); 890 jlong ticks = windows_to_time_ticks(wt); // 10th of micros 891 jlong secs = jlong(ticks / 10000000); // 10000 * 1000 892 seconds = secs; 893 nanos = jlong(ticks - (secs*10000000)) * 100; 894 } 895 896 jlong os::javaTimeNanos() { 897 if (!win32::_has_performance_count) { 898 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do. 899 } else { 900 LARGE_INTEGER current_count; 901 QueryPerformanceCounter(¤t_count); 902 double current = as_long(current_count); 903 double freq = performance_frequency; 904 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC); 905 return time; 906 } 907 } 908 909 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 910 if (!win32::_has_performance_count) { 911 // javaTimeMillis() doesn't have much percision, 912 // but it is not going to wrap -- so all 64 bits 913 info_ptr->max_value = ALL_64_BITS; 914 915 // this is a wall clock timer, so may skip 916 info_ptr->may_skip_backward = true; 917 info_ptr->may_skip_forward = true; 918 } else { 919 jlong freq = performance_frequency; 920 if (freq < NANOSECS_PER_SEC) { 921 // the performance counter is 64 bits and we will 922 // be multiplying it -- so no wrap in 64 bits 923 info_ptr->max_value = ALL_64_BITS; 924 } else if (freq > NANOSECS_PER_SEC) { 925 // use the max value the counter can reach to 926 // determine the max value which could be returned 927 julong max_counter = (julong)ALL_64_BITS; 928 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC)); 929 } else { 930 // the performance counter is 64 bits and we will 931 // be using it directly -- so no wrap in 64 bits 932 info_ptr->max_value = ALL_64_BITS; 933 } 934 935 // using a counter, so no skipping 936 info_ptr->may_skip_backward = false; 937 info_ptr->may_skip_forward = false; 938 } 939 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 940 } 941 942 char* os::local_time_string(char *buf, size_t buflen) { 943 SYSTEMTIME st; 944 GetLocalTime(&st); 945 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 946 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 947 return buf; 948 } 949 950 bool os::getTimesSecs(double* process_real_time, 951 double* process_user_time, 952 double* process_system_time) { 953 HANDLE h_process = GetCurrentProcess(); 954 FILETIME create_time, exit_time, kernel_time, user_time; 955 BOOL result = GetProcessTimes(h_process, 956 &create_time, 957 &exit_time, 958 &kernel_time, 959 &user_time); 960 if (result != 0) { 961 FILETIME wt; 962 GetSystemTimeAsFileTime(&wt); 963 jlong rtc_millis = windows_to_java_time(wt); 964 jlong user_millis = windows_to_java_time(user_time); 965 jlong system_millis = windows_to_java_time(kernel_time); 966 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 967 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); 968 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); 969 return true; 970 } else { 971 return false; 972 } 973 } 974 975 void os::shutdown() { 976 // allow PerfMemory to attempt cleanup of any persistent resources 977 perfMemory_exit(); 978 979 // flush buffered output, finish log files 980 ostream_abort(); 981 982 // Check for abort hook 983 abort_hook_t abort_hook = Arguments::abort_hook(); 984 if (abort_hook != NULL) { 985 abort_hook(); 986 } 987 } 988 989 990 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 991 PMINIDUMP_EXCEPTION_INFORMATION, 992 PMINIDUMP_USER_STREAM_INFORMATION, 993 PMINIDUMP_CALLBACK_INFORMATION); 994 995 static HANDLE dumpFile = NULL; 996 997 // Check if dump file can be created. 998 void os::check_dump_limit(char* buffer, size_t buffsz) { 999 bool status = true; 1000 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) { 1001 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line"); 1002 status = false; 1003 } 1004 1005 #ifndef ASSERT 1006 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) { 1007 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows"); 1008 status = false; 1009 } 1010 #endif 1011 1012 if (status) { 1013 const char* cwd = get_current_directory(NULL, 0); 1014 int pid = current_process_id(); 1015 if (cwd != NULL) { 1016 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid); 1017 } else { 1018 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid); 1019 } 1020 1021 if (dumpFile == NULL && 1022 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL)) 1023 == INVALID_HANDLE_VALUE) { 1024 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError()); 1025 status = false; 1026 } 1027 } 1028 VMError::record_coredump_status(buffer, status); 1029 } 1030 1031 void os::abort(bool dump_core, void* siginfo, void* context) { 1032 HINSTANCE dbghelp; 1033 EXCEPTION_POINTERS ep; 1034 MINIDUMP_EXCEPTION_INFORMATION mei; 1035 MINIDUMP_EXCEPTION_INFORMATION* pmei; 1036 1037 HANDLE hProcess = GetCurrentProcess(); 1038 DWORD processId = GetCurrentProcessId(); 1039 MINIDUMP_TYPE dumpType; 1040 1041 shutdown(); 1042 if (!dump_core || dumpFile == NULL) { 1043 if (dumpFile != NULL) { 1044 CloseHandle(dumpFile); 1045 } 1046 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1047 } 1048 1049 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0); 1050 1051 if (dbghelp == NULL) { 1052 jio_fprintf(stderr, "Failed to load dbghelp.dll\n"); 1053 CloseHandle(dumpFile); 1054 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1055 } 1056 1057 _MiniDumpWriteDump = 1058 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 1059 PMINIDUMP_EXCEPTION_INFORMATION, 1060 PMINIDUMP_USER_STREAM_INFORMATION, 1061 PMINIDUMP_CALLBACK_INFORMATION), 1062 GetProcAddress(dbghelp, 1063 "MiniDumpWriteDump")); 1064 1065 if (_MiniDumpWriteDump == NULL) { 1066 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n"); 1067 CloseHandle(dumpFile); 1068 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1069 } 1070 1071 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData); 1072 1073 // Older versions of dbghelp.h do not contain all the dumptypes we want, dbghelp.h with 1074 // API_VERSION_NUMBER 11 or higher contains the ones we want though 1075 #if API_VERSION_NUMBER >= 11 1076 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | 1077 MiniDumpWithUnloadedModules); 1078 #endif 1079 1080 if (siginfo != NULL && context != NULL) { 1081 ep.ContextRecord = (PCONTEXT) context; 1082 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo; 1083 1084 mei.ThreadId = GetCurrentThreadId(); 1085 mei.ExceptionPointers = &ep; 1086 pmei = &mei; 1087 } else { 1088 pmei = NULL; 1089 } 1090 1091 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all 1092 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then. 1093 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false && 1094 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) { 1095 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError()); 1096 } 1097 CloseHandle(dumpFile); 1098 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1099 } 1100 1101 // Die immediately, no exit hook, no abort hook, no cleanup. 1102 void os::die() { 1103 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1); 1104 } 1105 1106 // Directory routines copied from src/win32/native/java/io/dirent_md.c 1107 // * dirent_md.c 1.15 00/02/02 1108 // 1109 // The declarations for DIR and struct dirent are in jvm_win32.h. 1110 1111 // Caller must have already run dirname through JVM_NativePath, which removes 1112 // duplicate slashes and converts all instances of '/' into '\\'. 1113 1114 DIR * os::opendir(const char *dirname) { 1115 assert(dirname != NULL, "just checking"); // hotspot change 1116 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal); 1117 DWORD fattr; // hotspot change 1118 char alt_dirname[4] = { 0, 0, 0, 0 }; 1119 1120 if (dirp == 0) { 1121 errno = ENOMEM; 1122 return 0; 1123 } 1124 1125 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it 1126 // as a directory in FindFirstFile(). We detect this case here and 1127 // prepend the current drive name. 1128 // 1129 if (dirname[1] == '\0' && dirname[0] == '\\') { 1130 alt_dirname[0] = _getdrive() + 'A' - 1; 1131 alt_dirname[1] = ':'; 1132 alt_dirname[2] = '\\'; 1133 alt_dirname[3] = '\0'; 1134 dirname = alt_dirname; 1135 } 1136 1137 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal); 1138 if (dirp->path == 0) { 1139 free(dirp); 1140 errno = ENOMEM; 1141 return 0; 1142 } 1143 strcpy(dirp->path, dirname); 1144 1145 fattr = GetFileAttributes(dirp->path); 1146 if (fattr == 0xffffffff) { 1147 free(dirp->path); 1148 free(dirp); 1149 errno = ENOENT; 1150 return 0; 1151 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 1152 free(dirp->path); 1153 free(dirp); 1154 errno = ENOTDIR; 1155 return 0; 1156 } 1157 1158 // Append "*.*", or possibly "\\*.*", to path 1159 if (dirp->path[1] == ':' && 1160 (dirp->path[2] == '\0' || 1161 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 1162 // No '\\' needed for cases like "Z:" or "Z:\" 1163 strcat(dirp->path, "*.*"); 1164 } else { 1165 strcat(dirp->path, "\\*.*"); 1166 } 1167 1168 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 1169 if (dirp->handle == INVALID_HANDLE_VALUE) { 1170 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 1171 free(dirp->path); 1172 free(dirp); 1173 errno = EACCES; 1174 return 0; 1175 } 1176 } 1177 return dirp; 1178 } 1179 1180 // parameter dbuf unused on Windows 1181 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) { 1182 assert(dirp != NULL, "just checking"); // hotspot change 1183 if (dirp->handle == INVALID_HANDLE_VALUE) { 1184 return 0; 1185 } 1186 1187 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 1188 1189 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 1190 if (GetLastError() == ERROR_INVALID_HANDLE) { 1191 errno = EBADF; 1192 return 0; 1193 } 1194 FindClose(dirp->handle); 1195 dirp->handle = INVALID_HANDLE_VALUE; 1196 } 1197 1198 return &dirp->dirent; 1199 } 1200 1201 int os::closedir(DIR *dirp) { 1202 assert(dirp != NULL, "just checking"); // hotspot change 1203 if (dirp->handle != INVALID_HANDLE_VALUE) { 1204 if (!FindClose(dirp->handle)) { 1205 errno = EBADF; 1206 return -1; 1207 } 1208 dirp->handle = INVALID_HANDLE_VALUE; 1209 } 1210 free(dirp->path); 1211 free(dirp); 1212 return 0; 1213 } 1214 1215 // This must be hard coded because it's the system's temporary 1216 // directory not the java application's temp directory, ala java.io.tmpdir. 1217 const char* os::get_temp_directory() { 1218 static char path_buf[MAX_PATH]; 1219 if (GetTempPath(MAX_PATH, path_buf) > 0) { 1220 return path_buf; 1221 } else { 1222 path_buf[0] = '\0'; 1223 return path_buf; 1224 } 1225 } 1226 1227 static bool file_exists(const char* filename) { 1228 if (filename == NULL || strlen(filename) == 0) { 1229 return false; 1230 } 1231 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES; 1232 } 1233 1234 bool os::dll_build_name(char *buffer, size_t buflen, 1235 const char* pname, const char* fname) { 1236 bool retval = false; 1237 const size_t pnamelen = pname ? strlen(pname) : 0; 1238 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0; 1239 1240 // Return error on buffer overflow. 1241 if (pnamelen + strlen(fname) + 10 > buflen) { 1242 return retval; 1243 } 1244 1245 if (pnamelen == 0) { 1246 jio_snprintf(buffer, buflen, "%s.dll", fname); 1247 retval = true; 1248 } else if (c == ':' || c == '\\') { 1249 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname); 1250 retval = true; 1251 } else if (strchr(pname, *os::path_separator()) != NULL) { 1252 int n; 1253 char** pelements = split_path(pname, &n); 1254 if (pelements == NULL) { 1255 return false; 1256 } 1257 for (int i = 0; i < n; i++) { 1258 char* path = pelements[i]; 1259 // Really shouldn't be NULL, but check can't hurt 1260 size_t plen = (path == NULL) ? 0 : strlen(path); 1261 if (plen == 0) { 1262 continue; // skip the empty path values 1263 } 1264 const char lastchar = path[plen - 1]; 1265 if (lastchar == ':' || lastchar == '\\') { 1266 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname); 1267 } else { 1268 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname); 1269 } 1270 if (file_exists(buffer)) { 1271 retval = true; 1272 break; 1273 } 1274 } 1275 // release the storage 1276 for (int i = 0; i < n; i++) { 1277 if (pelements[i] != NULL) { 1278 FREE_C_HEAP_ARRAY(char, pelements[i]); 1279 } 1280 } 1281 if (pelements != NULL) { 1282 FREE_C_HEAP_ARRAY(char*, pelements); 1283 } 1284 } else { 1285 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname); 1286 retval = true; 1287 } 1288 return retval; 1289 } 1290 1291 // Needs to be in os specific directory because windows requires another 1292 // header file <direct.h> 1293 const char* os::get_current_directory(char *buf, size_t buflen) { 1294 int n = static_cast<int>(buflen); 1295 if (buflen > INT_MAX) n = INT_MAX; 1296 return _getcwd(buf, n); 1297 } 1298 1299 //----------------------------------------------------------- 1300 // Helper functions for fatal error handler 1301 #ifdef _WIN64 1302 // Helper routine which returns true if address in 1303 // within the NTDLL address space. 1304 // 1305 static bool _addr_in_ntdll(address addr) { 1306 HMODULE hmod; 1307 MODULEINFO minfo; 1308 1309 hmod = GetModuleHandle("NTDLL.DLL"); 1310 if (hmod == NULL) return false; 1311 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod, 1312 &minfo, sizeof(MODULEINFO))) { 1313 return false; 1314 } 1315 1316 if ((addr >= minfo.lpBaseOfDll) && 1317 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) { 1318 return true; 1319 } else { 1320 return false; 1321 } 1322 } 1323 #endif 1324 1325 struct _modinfo { 1326 address addr; 1327 char* full_path; // point to a char buffer 1328 int buflen; // size of the buffer 1329 address base_addr; 1330 }; 1331 1332 static int _locate_module_by_addr(const char * mod_fname, address base_addr, 1333 address top_address, void * param) { 1334 struct _modinfo *pmod = (struct _modinfo *)param; 1335 if (!pmod) return -1; 1336 1337 if (base_addr <= pmod->addr && 1338 top_address > pmod->addr) { 1339 // if a buffer is provided, copy path name to the buffer 1340 if (pmod->full_path) { 1341 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1342 } 1343 pmod->base_addr = base_addr; 1344 return 1; 1345 } 1346 return 0; 1347 } 1348 1349 bool os::dll_address_to_library_name(address addr, char* buf, 1350 int buflen, int* offset) { 1351 // buf is not optional, but offset is optional 1352 assert(buf != NULL, "sanity check"); 1353 1354 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1355 // return the full path to the DLL file, sometimes it returns path 1356 // to the corresponding PDB file (debug info); sometimes it only 1357 // returns partial path, which makes life painful. 1358 1359 struct _modinfo mi; 1360 mi.addr = addr; 1361 mi.full_path = buf; 1362 mi.buflen = buflen; 1363 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) { 1364 // buf already contains path name 1365 if (offset) *offset = addr - mi.base_addr; 1366 return true; 1367 } 1368 1369 buf[0] = '\0'; 1370 if (offset) *offset = -1; 1371 return false; 1372 } 1373 1374 bool os::dll_address_to_function_name(address addr, char *buf, 1375 int buflen, int *offset, 1376 bool demangle) { 1377 // buf is not optional, but offset is optional 1378 assert(buf != NULL, "sanity check"); 1379 1380 if (Decoder::decode(addr, buf, buflen, offset, demangle)) { 1381 return true; 1382 } 1383 if (offset != NULL) *offset = -1; 1384 buf[0] = '\0'; 1385 return false; 1386 } 1387 1388 // save the start and end address of jvm.dll into param[0] and param[1] 1389 static int _locate_jvm_dll(const char* mod_fname, address base_addr, 1390 address top_address, void * param) { 1391 if (!param) return -1; 1392 1393 if (base_addr <= (address)_locate_jvm_dll && 1394 top_address > (address)_locate_jvm_dll) { 1395 ((address*)param)[0] = base_addr; 1396 ((address*)param)[1] = top_address; 1397 return 1; 1398 } 1399 return 0; 1400 } 1401 1402 address vm_lib_location[2]; // start and end address of jvm.dll 1403 1404 // check if addr is inside jvm.dll 1405 bool os::address_is_in_vm(address addr) { 1406 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1407 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) { 1408 assert(false, "Can't find jvm module."); 1409 return false; 1410 } 1411 } 1412 1413 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1414 } 1415 1416 // print module info; param is outputStream* 1417 static int _print_module(const char* fname, address base_address, 1418 address top_address, void* param) { 1419 if (!param) return -1; 1420 1421 outputStream* st = (outputStream*)param; 1422 1423 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname); 1424 return 0; 1425 } 1426 1427 // Loads .dll/.so and 1428 // in case of error it checks if .dll/.so was built for the 1429 // same architecture as Hotspot is running on 1430 void * os::dll_load(const char *name, char *ebuf, int ebuflen) { 1431 void * result = LoadLibrary(name); 1432 if (result != NULL) { 1433 return result; 1434 } 1435 1436 DWORD errcode = GetLastError(); 1437 if (errcode == ERROR_MOD_NOT_FOUND) { 1438 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1); 1439 ebuf[ebuflen - 1] = '\0'; 1440 return NULL; 1441 } 1442 1443 // Parsing dll below 1444 // If we can read dll-info and find that dll was built 1445 // for an architecture other than Hotspot is running in 1446 // - then print to buffer "DLL was built for a different architecture" 1447 // else call os::lasterror to obtain system error message 1448 1449 // Read system error message into ebuf 1450 // It may or may not be overwritten below (in the for loop and just above) 1451 lasterror(ebuf, (size_t) ebuflen); 1452 ebuf[ebuflen - 1] = '\0'; 1453 int fd = ::open(name, O_RDONLY | O_BINARY, 0); 1454 if (fd < 0) { 1455 return NULL; 1456 } 1457 1458 uint32_t signature_offset; 1459 uint16_t lib_arch = 0; 1460 bool failed_to_get_lib_arch = 1461 ( // Go to position 3c in the dll 1462 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0) 1463 || 1464 // Read location of signature 1465 (sizeof(signature_offset) != 1466 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset)))) 1467 || 1468 // Go to COFF File Header in dll 1469 // that is located after "signature" (4 bytes long) 1470 (os::seek_to_file_offset(fd, 1471 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0) 1472 || 1473 // Read field that contains code of architecture 1474 // that dll was built for 1475 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch)))) 1476 ); 1477 1478 ::close(fd); 1479 if (failed_to_get_lib_arch) { 1480 // file i/o error - report os::lasterror(...) msg 1481 return NULL; 1482 } 1483 1484 typedef struct { 1485 uint16_t arch_code; 1486 char* arch_name; 1487 } arch_t; 1488 1489 static const arch_t arch_array[] = { 1490 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1491 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1492 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1493 }; 1494 #if (defined _M_IA64) 1495 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64; 1496 #elif (defined _M_AMD64) 1497 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64; 1498 #elif (defined _M_IX86) 1499 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386; 1500 #else 1501 #error Method os::dll_load requires that one of following \ 1502 is defined :_M_IA64,_M_AMD64 or _M_IX86 1503 #endif 1504 1505 1506 // Obtain a string for printf operation 1507 // lib_arch_str shall contain string what platform this .dll was built for 1508 // running_arch_str shall string contain what platform Hotspot was built for 1509 char *running_arch_str = NULL, *lib_arch_str = NULL; 1510 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) { 1511 if (lib_arch == arch_array[i].arch_code) { 1512 lib_arch_str = arch_array[i].arch_name; 1513 } 1514 if (running_arch == arch_array[i].arch_code) { 1515 running_arch_str = arch_array[i].arch_name; 1516 } 1517 } 1518 1519 assert(running_arch_str, 1520 "Didn't find running architecture code in arch_array"); 1521 1522 // If the architecture is right 1523 // but some other error took place - report os::lasterror(...) msg 1524 if (lib_arch == running_arch) { 1525 return NULL; 1526 } 1527 1528 if (lib_arch_str != NULL) { 1529 ::_snprintf(ebuf, ebuflen - 1, 1530 "Can't load %s-bit .dll on a %s-bit platform", 1531 lib_arch_str, running_arch_str); 1532 } else { 1533 // don't know what architecture this dll was build for 1534 ::_snprintf(ebuf, ebuflen - 1, 1535 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1536 lib_arch, running_arch_str); 1537 } 1538 1539 return NULL; 1540 } 1541 1542 void os::print_dll_info(outputStream *st) { 1543 st->print_cr("Dynamic libraries:"); 1544 get_loaded_modules_info(_print_module, (void *)st); 1545 } 1546 1547 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1548 HANDLE hProcess; 1549 1550 # define MAX_NUM_MODULES 128 1551 HMODULE modules[MAX_NUM_MODULES]; 1552 static char filename[MAX_PATH]; 1553 int result = 0; 1554 1555 if (!os::PSApiDll::PSApiAvailable()) { 1556 return 0; 1557 } 1558 1559 int pid = os::current_process_id(); 1560 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1561 FALSE, pid); 1562 if (hProcess == NULL) return 0; 1563 1564 DWORD size_needed; 1565 if (!os::PSApiDll::EnumProcessModules(hProcess, modules, 1566 sizeof(modules), &size_needed)) { 1567 CloseHandle(hProcess); 1568 return 0; 1569 } 1570 1571 // number of modules that are currently loaded 1572 int num_modules = size_needed / sizeof(HMODULE); 1573 1574 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1575 // Get Full pathname: 1576 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i], 1577 filename, sizeof(filename))) { 1578 filename[0] = '\0'; 1579 } 1580 1581 MODULEINFO modinfo; 1582 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i], 1583 &modinfo, sizeof(modinfo))) { 1584 modinfo.lpBaseOfDll = NULL; 1585 modinfo.SizeOfImage = 0; 1586 } 1587 1588 // Invoke callback function 1589 result = callback(filename, (address)modinfo.lpBaseOfDll, 1590 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param); 1591 if (result) break; 1592 } 1593 1594 CloseHandle(hProcess); 1595 return result; 1596 } 1597 1598 #ifndef PRODUCT 1599 bool os::get_host_name(char* buf, size_t buflen) { 1600 DWORD size = (DWORD)buflen; 1601 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE); 1602 } 1603 #endif // PRODUCT 1604 1605 void os::get_summary_os_info(char* buf, size_t buflen) { 1606 stringStream sst(buf, buflen); 1607 os::win32::print_windows_version(&sst); 1608 // chop off newline character 1609 char* nl = strchr(buf, '\n'); 1610 if (nl != NULL) *nl = '\0'; 1611 } 1612 1613 void os::print_os_info_brief(outputStream* st) { 1614 os::print_os_info(st); 1615 } 1616 1617 void os::print_os_info(outputStream* st) { 1618 #ifdef ASSERT 1619 char buffer[1024]; 1620 st->print("HostName: "); 1621 if (get_host_name(buffer, sizeof(buffer))) { 1622 st->print("%s ", buffer); 1623 } else { 1624 st->print("N/A "); 1625 } 1626 #endif 1627 st->print("OS:"); 1628 os::win32::print_windows_version(st); 1629 } 1630 1631 void os::win32::print_windows_version(outputStream* st) { 1632 OSVERSIONINFOEX osvi; 1633 VS_FIXEDFILEINFO *file_info; 1634 TCHAR kernel32_path[MAX_PATH]; 1635 UINT len, ret; 1636 1637 // Use the GetVersionEx information to see if we're on a server or 1638 // workstation edition of Windows. Starting with Windows 8.1 we can't 1639 // trust the OS version information returned by this API. 1640 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1641 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1642 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1643 st->print_cr("Call to GetVersionEx failed"); 1644 return; 1645 } 1646 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION); 1647 1648 // Get the full path to \Windows\System32\kernel32.dll and use that for 1649 // determining what version of Windows we're running on. 1650 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1; 1651 ret = GetSystemDirectory(kernel32_path, len); 1652 if (ret == 0 || ret > len) { 1653 st->print_cr("Call to GetSystemDirectory failed"); 1654 return; 1655 } 1656 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret); 1657 1658 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL); 1659 if (version_size == 0) { 1660 st->print_cr("Call to GetFileVersionInfoSize failed"); 1661 return; 1662 } 1663 1664 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal); 1665 if (version_info == NULL) { 1666 st->print_cr("Failed to allocate version_info"); 1667 return; 1668 } 1669 1670 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) { 1671 os::free(version_info); 1672 st->print_cr("Call to GetFileVersionInfo failed"); 1673 return; 1674 } 1675 1676 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) { 1677 os::free(version_info); 1678 st->print_cr("Call to VerQueryValue failed"); 1679 return; 1680 } 1681 1682 int major_version = HIWORD(file_info->dwProductVersionMS); 1683 int minor_version = LOWORD(file_info->dwProductVersionMS); 1684 int build_number = HIWORD(file_info->dwProductVersionLS); 1685 int build_minor = LOWORD(file_info->dwProductVersionLS); 1686 int os_vers = major_version * 1000 + minor_version; 1687 os::free(version_info); 1688 1689 st->print(" Windows "); 1690 switch (os_vers) { 1691 1692 case 6000: 1693 if (is_workstation) { 1694 st->print("Vista"); 1695 } else { 1696 st->print("Server 2008"); 1697 } 1698 break; 1699 1700 case 6001: 1701 if (is_workstation) { 1702 st->print("7"); 1703 } else { 1704 st->print("Server 2008 R2"); 1705 } 1706 break; 1707 1708 case 6002: 1709 if (is_workstation) { 1710 st->print("8"); 1711 } else { 1712 st->print("Server 2012"); 1713 } 1714 break; 1715 1716 case 6003: 1717 if (is_workstation) { 1718 st->print("8.1"); 1719 } else { 1720 st->print("Server 2012 R2"); 1721 } 1722 break; 1723 1724 case 10000: 1725 if (is_workstation) { 1726 st->print("10"); 1727 } else { 1728 // The server version name of Windows 10 is not known at this time 1729 st->print("%d.%d", major_version, minor_version); 1730 } 1731 break; 1732 1733 default: 1734 // Unrecognized windows, print out its major and minor versions 1735 st->print("%d.%d", major_version, minor_version); 1736 break; 1737 } 1738 1739 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1740 // find out whether we are running on 64 bit processor or not 1741 SYSTEM_INFO si; 1742 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1743 os::Kernel32Dll::GetNativeSystemInfo(&si); 1744 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1745 st->print(" , 64 bit"); 1746 } 1747 1748 st->print(" Build %d", build_number); 1749 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor); 1750 st->cr(); 1751 } 1752 1753 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1754 // Nothing to do for now. 1755 } 1756 1757 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1758 HKEY key; 1759 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE, 1760 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key); 1761 if (status == ERROR_SUCCESS) { 1762 DWORD size = (DWORD)buflen; 1763 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size); 1764 if (status != ERROR_SUCCESS) { 1765 strncpy(buf, "## __CPU__", buflen); 1766 } 1767 RegCloseKey(key); 1768 } else { 1769 // Put generic cpu info to return 1770 strncpy(buf, "## __CPU__", buflen); 1771 } 1772 } 1773 1774 void os::print_memory_info(outputStream* st) { 1775 st->print("Memory:"); 1776 st->print(" %dk page", os::vm_page_size()>>10); 1777 1778 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1779 // value if total memory is larger than 4GB 1780 MEMORYSTATUSEX ms; 1781 ms.dwLength = sizeof(ms); 1782 GlobalMemoryStatusEx(&ms); 1783 1784 st->print(", physical %uk", os::physical_memory() >> 10); 1785 st->print("(%uk free)", os::available_memory() >> 10); 1786 1787 st->print(", swap %uk", ms.ullTotalPageFile >> 10); 1788 st->print("(%uk free)", ms.ullAvailPageFile >> 10); 1789 st->cr(); 1790 } 1791 1792 void os::print_siginfo(outputStream *st, void *siginfo) { 1793 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1794 st->print("siginfo:"); 1795 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1796 1797 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1798 er->NumberParameters >= 2) { 1799 switch (er->ExceptionInformation[0]) { 1800 case 0: st->print(", reading address"); break; 1801 case 1: st->print(", writing address"); break; 1802 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1803 er->ExceptionInformation[0]); 1804 } 1805 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1806 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1807 er->NumberParameters >= 2 && UseSharedSpaces) { 1808 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1809 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1810 st->print("\n\nError accessing class data sharing archive." \ 1811 " Mapped file inaccessible during execution, " \ 1812 " possible disk/network problem."); 1813 } 1814 } else { 1815 int num = er->NumberParameters; 1816 if (num > 0) { 1817 st->print(", ExceptionInformation="); 1818 for (int i = 0; i < num; i++) { 1819 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1820 } 1821 } 1822 } 1823 st->cr(); 1824 } 1825 1826 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1827 // do nothing 1828 } 1829 1830 static char saved_jvm_path[MAX_PATH] = {0}; 1831 1832 // Find the full path to the current module, jvm.dll 1833 void os::jvm_path(char *buf, jint buflen) { 1834 // Error checking. 1835 if (buflen < MAX_PATH) { 1836 assert(false, "must use a large-enough buffer"); 1837 buf[0] = '\0'; 1838 return; 1839 } 1840 // Lazy resolve the path to current module. 1841 if (saved_jvm_path[0] != 0) { 1842 strcpy(buf, saved_jvm_path); 1843 return; 1844 } 1845 1846 buf[0] = '\0'; 1847 if (Arguments::sun_java_launcher_is_altjvm()) { 1848 // Support for the java launcher's '-XXaltjvm=<path>' option. Check 1849 // for a JAVA_HOME environment variable and fix up the path so it 1850 // looks like jvm.dll is installed there (append a fake suffix 1851 // hotspot/jvm.dll). 1852 char* java_home_var = ::getenv("JAVA_HOME"); 1853 if (java_home_var != NULL && java_home_var[0] != 0 && 1854 strlen(java_home_var) < (size_t)buflen) { 1855 strncpy(buf, java_home_var, buflen); 1856 1857 // determine if this is a legacy image or modules image 1858 // modules image doesn't have "jre" subdirectory 1859 size_t len = strlen(buf); 1860 char* jrebin_p = buf + len; 1861 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1862 if (0 != _access(buf, 0)) { 1863 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1864 } 1865 len = strlen(buf); 1866 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1867 } 1868 } 1869 1870 if (buf[0] == '\0') { 1871 GetModuleFileName(vm_lib_handle, buf, buflen); 1872 } 1873 strncpy(saved_jvm_path, buf, MAX_PATH); 1874 saved_jvm_path[MAX_PATH - 1] = '\0'; 1875 } 1876 1877 1878 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1879 #ifndef _WIN64 1880 st->print("_"); 1881 #endif 1882 } 1883 1884 1885 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1886 #ifndef _WIN64 1887 st->print("@%d", args_size * sizeof(int)); 1888 #endif 1889 } 1890 1891 // This method is a copy of JDK's sysGetLastErrorString 1892 // from src/windows/hpi/src/system_md.c 1893 1894 size_t os::lasterror(char* buf, size_t len) { 1895 DWORD errval; 1896 1897 if ((errval = GetLastError()) != 0) { 1898 // DOS error 1899 size_t n = (size_t)FormatMessage( 1900 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1901 NULL, 1902 errval, 1903 0, 1904 buf, 1905 (DWORD)len, 1906 NULL); 1907 if (n > 3) { 1908 // Drop final '.', CR, LF 1909 if (buf[n - 1] == '\n') n--; 1910 if (buf[n - 1] == '\r') n--; 1911 if (buf[n - 1] == '.') n--; 1912 buf[n] = '\0'; 1913 } 1914 return n; 1915 } 1916 1917 if (errno != 0) { 1918 // C runtime error that has no corresponding DOS error code 1919 const char* s = strerror(errno); 1920 size_t n = strlen(s); 1921 if (n >= len) n = len - 1; 1922 strncpy(buf, s, n); 1923 buf[n] = '\0'; 1924 return n; 1925 } 1926 1927 return 0; 1928 } 1929 1930 int os::get_last_error() { 1931 DWORD error = GetLastError(); 1932 if (error == 0) { 1933 error = errno; 1934 } 1935 return (int)error; 1936 } 1937 1938 WindowsSemaphore::WindowsSemaphore(uint value) { 1939 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL); 1940 1941 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError()); 1942 } 1943 1944 WindowsSemaphore::~WindowsSemaphore() { 1945 ::CloseHandle(_semaphore); 1946 } 1947 1948 void WindowsSemaphore::signal(uint count) { 1949 if (count > 0) { 1950 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL); 1951 1952 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError()); 1953 } 1954 } 1955 1956 void WindowsSemaphore::wait() { 1957 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE); 1958 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError()); 1959 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret); 1960 } 1961 1962 // sun.misc.Signal 1963 // NOTE that this is a workaround for an apparent kernel bug where if 1964 // a signal handler for SIGBREAK is installed then that signal handler 1965 // takes priority over the console control handler for CTRL_CLOSE_EVENT. 1966 // See bug 4416763. 1967 static void (*sigbreakHandler)(int) = NULL; 1968 1969 static void UserHandler(int sig, void *siginfo, void *context) { 1970 os::signal_notify(sig); 1971 // We need to reinstate the signal handler each time... 1972 os::signal(sig, (void*)UserHandler); 1973 } 1974 1975 void* os::user_handler() { 1976 return (void*) UserHandler; 1977 } 1978 1979 void* os::signal(int signal_number, void* handler) { 1980 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1981 void (*oldHandler)(int) = sigbreakHandler; 1982 sigbreakHandler = (void (*)(int)) handler; 1983 return (void*) oldHandler; 1984 } else { 1985 return (void*)::signal(signal_number, (void (*)(int))handler); 1986 } 1987 } 1988 1989 void os::signal_raise(int signal_number) { 1990 raise(signal_number); 1991 } 1992 1993 // The Win32 C runtime library maps all console control events other than ^C 1994 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1995 // logoff, and shutdown events. We therefore install our own console handler 1996 // that raises SIGTERM for the latter cases. 1997 // 1998 static BOOL WINAPI consoleHandler(DWORD event) { 1999 switch (event) { 2000 case CTRL_C_EVENT: 2001 if (is_error_reported()) { 2002 // Ctrl-C is pressed during error reporting, likely because the error 2003 // handler fails to abort. Let VM die immediately. 2004 os::die(); 2005 } 2006 2007 os::signal_raise(SIGINT); 2008 return TRUE; 2009 break; 2010 case CTRL_BREAK_EVENT: 2011 if (sigbreakHandler != NULL) { 2012 (*sigbreakHandler)(SIGBREAK); 2013 } 2014 return TRUE; 2015 break; 2016 case CTRL_LOGOFF_EVENT: { 2017 // Don't terminate JVM if it is running in a non-interactive session, 2018 // such as a service process. 2019 USEROBJECTFLAGS flags; 2020 HANDLE handle = GetProcessWindowStation(); 2021 if (handle != NULL && 2022 GetUserObjectInformation(handle, UOI_FLAGS, &flags, 2023 sizeof(USEROBJECTFLAGS), NULL)) { 2024 // If it is a non-interactive session, let next handler to deal 2025 // with it. 2026 if ((flags.dwFlags & WSF_VISIBLE) == 0) { 2027 return FALSE; 2028 } 2029 } 2030 } 2031 case CTRL_CLOSE_EVENT: 2032 case CTRL_SHUTDOWN_EVENT: 2033 os::signal_raise(SIGTERM); 2034 return TRUE; 2035 break; 2036 default: 2037 break; 2038 } 2039 return FALSE; 2040 } 2041 2042 // The following code is moved from os.cpp for making this 2043 // code platform specific, which it is by its very nature. 2044 2045 // Return maximum OS signal used + 1 for internal use only 2046 // Used as exit signal for signal_thread 2047 int os::sigexitnum_pd() { 2048 return NSIG; 2049 } 2050 2051 // a counter for each possible signal value, including signal_thread exit signal 2052 static volatile jint pending_signals[NSIG+1] = { 0 }; 2053 static HANDLE sig_sem = NULL; 2054 2055 void os::signal_init_pd() { 2056 // Initialize signal structures 2057 memset((void*)pending_signals, 0, sizeof(pending_signals)); 2058 2059 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 2060 2061 // Programs embedding the VM do not want it to attempt to receive 2062 // events like CTRL_LOGOFF_EVENT, which are used to implement the 2063 // shutdown hooks mechanism introduced in 1.3. For example, when 2064 // the VM is run as part of a Windows NT service (i.e., a servlet 2065 // engine in a web server), the correct behavior is for any console 2066 // control handler to return FALSE, not TRUE, because the OS's 2067 // "final" handler for such events allows the process to continue if 2068 // it is a service (while terminating it if it is not a service). 2069 // To make this behavior uniform and the mechanism simpler, we 2070 // completely disable the VM's usage of these console events if -Xrs 2071 // (=ReduceSignalUsage) is specified. This means, for example, that 2072 // the CTRL-BREAK thread dump mechanism is also disabled in this 2073 // case. See bugs 4323062, 4345157, and related bugs. 2074 2075 if (!ReduceSignalUsage) { 2076 // Add a CTRL-C handler 2077 SetConsoleCtrlHandler(consoleHandler, TRUE); 2078 } 2079 } 2080 2081 void os::signal_notify(int signal_number) { 2082 BOOL ret; 2083 if (sig_sem != NULL) { 2084 Atomic::inc(&pending_signals[signal_number]); 2085 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2086 assert(ret != 0, "ReleaseSemaphore() failed"); 2087 } 2088 } 2089 2090 static int check_pending_signals(bool wait_for_signal) { 2091 DWORD ret; 2092 while (true) { 2093 for (int i = 0; i < NSIG + 1; i++) { 2094 jint n = pending_signals[i]; 2095 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2096 return i; 2097 } 2098 } 2099 if (!wait_for_signal) { 2100 return -1; 2101 } 2102 2103 JavaThread *thread = JavaThread::current(); 2104 2105 ThreadBlockInVM tbivm(thread); 2106 2107 bool threadIsSuspended; 2108 do { 2109 thread->set_suspend_equivalent(); 2110 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2111 ret = ::WaitForSingleObject(sig_sem, INFINITE); 2112 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 2113 2114 // were we externally suspended while we were waiting? 2115 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2116 if (threadIsSuspended) { 2117 // The semaphore has been incremented, but while we were waiting 2118 // another thread suspended us. We don't want to continue running 2119 // while suspended because that would surprise the thread that 2120 // suspended us. 2121 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2122 assert(ret != 0, "ReleaseSemaphore() failed"); 2123 2124 thread->java_suspend_self(); 2125 } 2126 } while (threadIsSuspended); 2127 } 2128 } 2129 2130 int os::signal_lookup() { 2131 return check_pending_signals(false); 2132 } 2133 2134 int os::signal_wait() { 2135 return check_pending_signals(true); 2136 } 2137 2138 // Implicit OS exception handling 2139 2140 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, 2141 address handler) { 2142 JavaThread* thread = JavaThread::current(); 2143 // Save pc in thread 2144 #ifdef _M_IA64 2145 // Do not blow up if no thread info available. 2146 if (thread) { 2147 // Saving PRECISE pc (with slot information) in thread. 2148 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress; 2149 // Convert precise PC into "Unix" format 2150 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2); 2151 thread->set_saved_exception_pc((address)precise_pc); 2152 } 2153 // Set pc to handler 2154 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 2155 // Clear out psr.ri (= Restart Instruction) in order to continue 2156 // at the beginning of the target bundle. 2157 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF; 2158 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!"); 2159 #else 2160 #ifdef _M_AMD64 2161 // Do not blow up if no thread info available. 2162 if (thread) { 2163 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip); 2164 } 2165 // Set pc to handler 2166 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 2167 #else 2168 // Do not blow up if no thread info available. 2169 if (thread) { 2170 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip); 2171 } 2172 // Set pc to handler 2173 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler; 2174 #endif 2175 #endif 2176 2177 // Continue the execution 2178 return EXCEPTION_CONTINUE_EXECUTION; 2179 } 2180 2181 2182 // Used for PostMortemDump 2183 extern "C" void safepoints(); 2184 extern "C" void find(int x); 2185 extern "C" void events(); 2186 2187 // According to Windows API documentation, an illegal instruction sequence should generate 2188 // the 0xC000001C exception code. However, real world experience shows that occasionnaly 2189 // the execution of an illegal instruction can generate the exception code 0xC000001E. This 2190 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 2191 2192 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 2193 2194 // From "Execution Protection in the Windows Operating System" draft 0.35 2195 // Once a system header becomes available, the "real" define should be 2196 // included or copied here. 2197 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2198 2199 // Handle NAT Bit consumption on IA64. 2200 #ifdef _M_IA64 2201 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION 2202 #endif 2203 2204 // Windows Vista/2008 heap corruption check 2205 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374 2206 2207 #define def_excpt(val) #val, val 2208 2209 struct siglabel { 2210 char *name; 2211 int number; 2212 }; 2213 2214 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual 2215 // C++ compiler contain this error code. Because this is a compiler-generated 2216 // error, the code is not listed in the Win32 API header files. 2217 // The code is actually a cryptic mnemonic device, with the initial "E" 2218 // standing for "exception" and the final 3 bytes (0x6D7363) representing the 2219 // ASCII values of "msc". 2220 2221 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363 2222 2223 2224 struct siglabel exceptlabels[] = { 2225 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2226 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2227 def_excpt(EXCEPTION_BREAKPOINT), 2228 def_excpt(EXCEPTION_SINGLE_STEP), 2229 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2230 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2231 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2232 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2233 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2234 def_excpt(EXCEPTION_FLT_OVERFLOW), 2235 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2236 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2237 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2238 def_excpt(EXCEPTION_INT_OVERFLOW), 2239 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2240 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2241 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2242 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2243 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2244 def_excpt(EXCEPTION_STACK_OVERFLOW), 2245 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2246 def_excpt(EXCEPTION_GUARD_PAGE), 2247 def_excpt(EXCEPTION_INVALID_HANDLE), 2248 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION), 2249 def_excpt(EXCEPTION_HEAP_CORRUPTION), 2250 #ifdef _M_IA64 2251 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION), 2252 #endif 2253 NULL, 0 2254 }; 2255 2256 const char* os::exception_name(int exception_code, char *buf, size_t size) { 2257 for (int i = 0; exceptlabels[i].name != NULL; i++) { 2258 if (exceptlabels[i].number == exception_code) { 2259 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2260 return buf; 2261 } 2262 } 2263 2264 return NULL; 2265 } 2266 2267 //----------------------------------------------------------------------------- 2268 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2269 // handle exception caused by idiv; should only happen for -MinInt/-1 2270 // (division by zero is handled explicitly) 2271 #ifdef _M_IA64 2272 assert(0, "Fix Handle_IDiv_Exception"); 2273 #else 2274 #ifdef _M_AMD64 2275 PCONTEXT ctx = exceptionInfo->ContextRecord; 2276 address pc = (address)ctx->Rip; 2277 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode"); 2278 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2279 if (pc[0] == 0xF7) { 2280 // set correct result values and continue after idiv instruction 2281 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes 2282 } else { 2283 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes 2284 } 2285 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation) 2286 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the 2287 // idiv opcode (0xF7). 2288 ctx->Rdx = (DWORD)0; // remainder 2289 // Continue the execution 2290 #else 2291 PCONTEXT ctx = exceptionInfo->ContextRecord; 2292 address pc = (address)ctx->Eip; 2293 assert(pc[0] == 0xF7, "not an idiv opcode"); 2294 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2295 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2296 // set correct result values and continue after idiv instruction 2297 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2298 ctx->Eax = (DWORD)min_jint; // result 2299 ctx->Edx = (DWORD)0; // remainder 2300 // Continue the execution 2301 #endif 2302 #endif 2303 return EXCEPTION_CONTINUE_EXECUTION; 2304 } 2305 2306 //----------------------------------------------------------------------------- 2307 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2308 PCONTEXT ctx = exceptionInfo->ContextRecord; 2309 #ifndef _WIN64 2310 // handle exception caused by native method modifying control word 2311 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2312 2313 switch (exception_code) { 2314 case EXCEPTION_FLT_DENORMAL_OPERAND: 2315 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2316 case EXCEPTION_FLT_INEXACT_RESULT: 2317 case EXCEPTION_FLT_INVALID_OPERATION: 2318 case EXCEPTION_FLT_OVERFLOW: 2319 case EXCEPTION_FLT_STACK_CHECK: 2320 case EXCEPTION_FLT_UNDERFLOW: 2321 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2322 if (fp_control_word != ctx->FloatSave.ControlWord) { 2323 // Restore FPCW and mask out FLT exceptions 2324 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2325 // Mask out pending FLT exceptions 2326 ctx->FloatSave.StatusWord &= 0xffffff00; 2327 return EXCEPTION_CONTINUE_EXECUTION; 2328 } 2329 } 2330 2331 if (prev_uef_handler != NULL) { 2332 // We didn't handle this exception so pass it to the previous 2333 // UnhandledExceptionFilter. 2334 return (prev_uef_handler)(exceptionInfo); 2335 } 2336 #else // !_WIN64 2337 // On Windows, the mxcsr control bits are non-volatile across calls 2338 // See also CR 6192333 2339 // 2340 jint MxCsr = INITIAL_MXCSR; 2341 // we can't use StubRoutines::addr_mxcsr_std() 2342 // because in Win64 mxcsr is not saved there 2343 if (MxCsr != ctx->MxCsr) { 2344 ctx->MxCsr = MxCsr; 2345 return EXCEPTION_CONTINUE_EXECUTION; 2346 } 2347 #endif // !_WIN64 2348 2349 return EXCEPTION_CONTINUE_SEARCH; 2350 } 2351 2352 static inline void report_error(Thread* t, DWORD exception_code, 2353 address addr, void* siginfo, void* context) { 2354 VMError::report_and_die(t, exception_code, addr, siginfo, context); 2355 2356 // If UseOsErrorReporting, this will return here and save the error file 2357 // somewhere where we can find it in the minidump. 2358 } 2359 2360 //----------------------------------------------------------------------------- 2361 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2362 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2363 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2364 #ifdef _M_IA64 2365 // On Itanium, we need the "precise pc", which has the slot number coded 2366 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format). 2367 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress; 2368 // Convert the pc to "Unix format", which has the slot number coded 2369 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2 2370 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction" 2371 // information is saved in the Unix format. 2372 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2)); 2373 #else 2374 #ifdef _M_AMD64 2375 address pc = (address) exceptionInfo->ContextRecord->Rip; 2376 #else 2377 address pc = (address) exceptionInfo->ContextRecord->Eip; 2378 #endif 2379 #endif 2380 Thread* t = Thread::current(); 2381 2382 // Handle SafeFetch32 and SafeFetchN exceptions. 2383 if (StubRoutines::is_safefetch_fault(pc)) { 2384 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc)); 2385 } 2386 2387 #ifndef _WIN64 2388 // Execution protection violation - win32 running on AMD64 only 2389 // Handled first to avoid misdiagnosis as a "normal" access violation; 2390 // This is safe to do because we have a new/unique ExceptionInformation 2391 // code for this condition. 2392 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2393 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2394 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2395 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2396 2397 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2398 int page_size = os::vm_page_size(); 2399 2400 // Make sure the pc and the faulting address are sane. 2401 // 2402 // If an instruction spans a page boundary, and the page containing 2403 // the beginning of the instruction is executable but the following 2404 // page is not, the pc and the faulting address might be slightly 2405 // different - we still want to unguard the 2nd page in this case. 2406 // 2407 // 15 bytes seems to be a (very) safe value for max instruction size. 2408 bool pc_is_near_addr = 2409 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2410 bool instr_spans_page_boundary = 2411 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2412 (intptr_t) page_size) > 0); 2413 2414 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2415 static volatile address last_addr = 2416 (address) os::non_memory_address_word(); 2417 2418 // In conservative mode, don't unguard unless the address is in the VM 2419 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2420 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2421 2422 // Set memory to RWX and retry 2423 address page_start = 2424 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2425 bool res = os::protect_memory((char*) page_start, page_size, 2426 os::MEM_PROT_RWX); 2427 2428 if (PrintMiscellaneous && Verbose) { 2429 char buf[256]; 2430 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 2431 "at " INTPTR_FORMAT 2432 ", unguarding " INTPTR_FORMAT ": %s", addr, 2433 page_start, (res ? "success" : strerror(errno))); 2434 tty->print_raw_cr(buf); 2435 } 2436 2437 // Set last_addr so if we fault again at the same address, we don't 2438 // end up in an endless loop. 2439 // 2440 // There are two potential complications here. Two threads trapping 2441 // at the same address at the same time could cause one of the 2442 // threads to think it already unguarded, and abort the VM. Likely 2443 // very rare. 2444 // 2445 // The other race involves two threads alternately trapping at 2446 // different addresses and failing to unguard the page, resulting in 2447 // an endless loop. This condition is probably even more unlikely 2448 // than the first. 2449 // 2450 // Although both cases could be avoided by using locks or thread 2451 // local last_addr, these solutions are unnecessary complication: 2452 // this handler is a best-effort safety net, not a complete solution. 2453 // It is disabled by default and should only be used as a workaround 2454 // in case we missed any no-execute-unsafe VM code. 2455 2456 last_addr = addr; 2457 2458 return EXCEPTION_CONTINUE_EXECUTION; 2459 } 2460 } 2461 2462 // Last unguard failed or not unguarding 2463 tty->print_raw_cr("Execution protection violation"); 2464 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2465 exceptionInfo->ContextRecord); 2466 return EXCEPTION_CONTINUE_SEARCH; 2467 } 2468 } 2469 #endif // _WIN64 2470 2471 // Check to see if we caught the safepoint code in the 2472 // process of write protecting the memory serialization page. 2473 // It write enables the page immediately after protecting it 2474 // so just return. 2475 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2476 JavaThread* thread = (JavaThread*) t; 2477 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2478 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2479 if (os::is_memory_serialize_page(thread, addr)) { 2480 // Block current thread until the memory serialize page permission restored. 2481 os::block_on_serialize_page_trap(); 2482 return EXCEPTION_CONTINUE_EXECUTION; 2483 } 2484 } 2485 2486 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) && 2487 VM_Version::is_cpuinfo_segv_addr(pc)) { 2488 // Verify that OS save/restore AVX registers. 2489 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr()); 2490 } 2491 2492 if (t != NULL && t->is_Java_thread()) { 2493 JavaThread* thread = (JavaThread*) t; 2494 bool in_java = thread->thread_state() == _thread_in_Java; 2495 2496 // Handle potential stack overflows up front. 2497 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2498 if (os::uses_stack_guard_pages()) { 2499 #ifdef _M_IA64 2500 // Use guard page for register stack. 2501 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2502 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2503 // Check for a register stack overflow on Itanium 2504 if (thread->addr_inside_register_stack_red_zone(addr)) { 2505 // Fatal red zone violation happens if the Java program 2506 // catches a StackOverflow error and does so much processing 2507 // that it runs beyond the unprotected yellow guard zone. As 2508 // a result, we are out of here. 2509 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit."); 2510 } else if(thread->addr_inside_register_stack(addr)) { 2511 // Disable the yellow zone which sets the state that 2512 // we've got a stack overflow problem. 2513 if (thread->stack_yellow_zone_enabled()) { 2514 thread->disable_stack_yellow_zone(); 2515 } 2516 // Give us some room to process the exception. 2517 thread->disable_register_stack_guard(); 2518 // Tracing with +Verbose. 2519 if (Verbose) { 2520 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc); 2521 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr); 2522 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base()); 2523 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]", 2524 thread->register_stack_base(), 2525 thread->register_stack_base() + thread->stack_size()); 2526 } 2527 2528 // Reguard the permanent register stack red zone just to be sure. 2529 // We saw Windows silently disabling this without telling us. 2530 thread->enable_register_stack_red_zone(); 2531 2532 return Handle_Exception(exceptionInfo, 2533 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2534 } 2535 #endif 2536 if (thread->stack_yellow_zone_enabled()) { 2537 // Yellow zone violation. The o/s has unprotected the first yellow 2538 // zone page for us. Note: must call disable_stack_yellow_zone to 2539 // update the enabled status, even if the zone contains only one page. 2540 thread->disable_stack_yellow_zone(); 2541 // If not in java code, return and hope for the best. 2542 return in_java 2543 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2544 : EXCEPTION_CONTINUE_EXECUTION; 2545 } else { 2546 // Fatal red zone violation. 2547 thread->disable_stack_red_zone(); 2548 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2549 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2550 exceptionInfo->ContextRecord); 2551 return EXCEPTION_CONTINUE_SEARCH; 2552 } 2553 } else if (in_java) { 2554 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2555 // a one-time-only guard page, which it has released to us. The next 2556 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2557 return Handle_Exception(exceptionInfo, 2558 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2559 } else { 2560 // Can only return and hope for the best. Further stack growth will 2561 // result in an ACCESS_VIOLATION. 2562 return EXCEPTION_CONTINUE_EXECUTION; 2563 } 2564 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2565 // Either stack overflow or null pointer exception. 2566 if (in_java) { 2567 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2568 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2569 address stack_end = thread->stack_base() - thread->stack_size(); 2570 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2571 // Stack overflow. 2572 assert(!os::uses_stack_guard_pages(), 2573 "should be caught by red zone code above."); 2574 return Handle_Exception(exceptionInfo, 2575 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2576 } 2577 // Check for safepoint polling and implicit null 2578 // We only expect null pointers in the stubs (vtable) 2579 // the rest are checked explicitly now. 2580 CodeBlob* cb = CodeCache::find_blob(pc); 2581 if (cb != NULL) { 2582 if (os::is_poll_address(addr)) { 2583 address stub = SharedRuntime::get_poll_stub(pc); 2584 return Handle_Exception(exceptionInfo, stub); 2585 } 2586 } 2587 { 2588 #ifdef _WIN64 2589 // If it's a legal stack address map the entire region in 2590 // 2591 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2592 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2593 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) { 2594 addr = (address)((uintptr_t)addr & 2595 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2596 os::commit_memory((char *)addr, thread->stack_base() - addr, 2597 !ExecMem); 2598 return EXCEPTION_CONTINUE_EXECUTION; 2599 } else 2600 #endif 2601 { 2602 // Null pointer exception. 2603 #ifdef _M_IA64 2604 // Process implicit null checks in compiled code. Note: Implicit null checks 2605 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs. 2606 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) { 2607 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format); 2608 // Handle implicit null check in UEP method entry 2609 if (cb && (cb->is_frame_complete_at(pc) || 2610 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) { 2611 if (Verbose) { 2612 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0); 2613 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format); 2614 tty->print_cr(" to addr " INTPTR_FORMAT, addr); 2615 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)", 2616 *(bundle_start + 1), *bundle_start); 2617 } 2618 return Handle_Exception(exceptionInfo, 2619 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL)); 2620 } 2621 } 2622 2623 // Implicit null checks were processed above. Hence, we should not reach 2624 // here in the usual case => die! 2625 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception"); 2626 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2627 exceptionInfo->ContextRecord); 2628 return EXCEPTION_CONTINUE_SEARCH; 2629 2630 #else // !IA64 2631 2632 // Windows 98 reports faulting addresses incorrectly 2633 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2634 !os::win32::is_nt()) { 2635 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2636 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2637 } 2638 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2639 exceptionInfo->ContextRecord); 2640 return EXCEPTION_CONTINUE_SEARCH; 2641 #endif 2642 } 2643 } 2644 } 2645 2646 #ifdef _WIN64 2647 // Special care for fast JNI field accessors. 2648 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2649 // in and the heap gets shrunk before the field access. 2650 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2651 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2652 if (addr != (address)-1) { 2653 return Handle_Exception(exceptionInfo, addr); 2654 } 2655 } 2656 #endif 2657 2658 // Stack overflow or null pointer exception in native code. 2659 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2660 exceptionInfo->ContextRecord); 2661 return EXCEPTION_CONTINUE_SEARCH; 2662 } // /EXCEPTION_ACCESS_VIOLATION 2663 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2664 #if defined _M_IA64 2665 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION || 2666 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) { 2667 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0); 2668 2669 // Compiled method patched to be non entrant? Following conditions must apply: 2670 // 1. must be first instruction in bundle 2671 // 2. must be a break instruction with appropriate code 2672 if ((((uint64_t) pc & 0x0F) == 0) && 2673 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) { 2674 return Handle_Exception(exceptionInfo, 2675 (address)SharedRuntime::get_handle_wrong_method_stub()); 2676 } 2677 } // /EXCEPTION_ILLEGAL_INSTRUCTION 2678 #endif 2679 2680 2681 if (in_java) { 2682 switch (exception_code) { 2683 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2684 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2685 2686 case EXCEPTION_INT_OVERFLOW: 2687 return Handle_IDiv_Exception(exceptionInfo); 2688 2689 } // switch 2690 } 2691 if (((thread->thread_state() == _thread_in_Java) || 2692 (thread->thread_state() == _thread_in_native)) && 2693 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) { 2694 LONG result=Handle_FLT_Exception(exceptionInfo); 2695 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2696 } 2697 } 2698 2699 if (exception_code != EXCEPTION_BREAKPOINT) { 2700 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2701 exceptionInfo->ContextRecord); 2702 } 2703 return EXCEPTION_CONTINUE_SEARCH; 2704 } 2705 2706 #ifndef _WIN64 2707 // Special care for fast JNI accessors. 2708 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2709 // the heap gets shrunk before the field access. 2710 // Need to install our own structured exception handler since native code may 2711 // install its own. 2712 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2713 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2714 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2715 address pc = (address) exceptionInfo->ContextRecord->Eip; 2716 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2717 if (addr != (address)-1) { 2718 return Handle_Exception(exceptionInfo, addr); 2719 } 2720 } 2721 return EXCEPTION_CONTINUE_SEARCH; 2722 } 2723 2724 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \ 2725 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \ 2726 jobject obj, \ 2727 jfieldID fieldID) { \ 2728 __try { \ 2729 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \ 2730 obj, \ 2731 fieldID); \ 2732 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \ 2733 _exception_info())) { \ 2734 } \ 2735 return 0; \ 2736 } 2737 2738 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2739 DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2740 DEFINE_FAST_GETFIELD(jchar, char, Char) 2741 DEFINE_FAST_GETFIELD(jshort, short, Short) 2742 DEFINE_FAST_GETFIELD(jint, int, Int) 2743 DEFINE_FAST_GETFIELD(jlong, long, Long) 2744 DEFINE_FAST_GETFIELD(jfloat, float, Float) 2745 DEFINE_FAST_GETFIELD(jdouble, double, Double) 2746 2747 address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2748 switch (type) { 2749 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2750 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2751 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2752 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2753 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2754 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2755 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2756 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2757 default: ShouldNotReachHere(); 2758 } 2759 return (address)-1; 2760 } 2761 #endif 2762 2763 // Virtual Memory 2764 2765 int os::vm_page_size() { return os::win32::vm_page_size(); } 2766 int os::vm_allocation_granularity() { 2767 return os::win32::vm_allocation_granularity(); 2768 } 2769 2770 // Windows large page support is available on Windows 2003. In order to use 2771 // large page memory, the administrator must first assign additional privilege 2772 // to the user: 2773 // + select Control Panel -> Administrative Tools -> Local Security Policy 2774 // + select Local Policies -> User Rights Assignment 2775 // + double click "Lock pages in memory", add users and/or groups 2776 // + reboot 2777 // Note the above steps are needed for administrator as well, as administrators 2778 // by default do not have the privilege to lock pages in memory. 2779 // 2780 // Note about Windows 2003: although the API supports committing large page 2781 // memory on a page-by-page basis and VirtualAlloc() returns success under this 2782 // scenario, I found through experiment it only uses large page if the entire 2783 // memory region is reserved and committed in a single VirtualAlloc() call. 2784 // This makes Windows large page support more or less like Solaris ISM, in 2785 // that the entire heap must be committed upfront. This probably will change 2786 // in the future, if so the code below needs to be revisited. 2787 2788 #ifndef MEM_LARGE_PAGES 2789 #define MEM_LARGE_PAGES 0x20000000 2790 #endif 2791 2792 static HANDLE _hProcess; 2793 static HANDLE _hToken; 2794 2795 // Container for NUMA node list info 2796 class NUMANodeListHolder { 2797 private: 2798 int *_numa_used_node_list; // allocated below 2799 int _numa_used_node_count; 2800 2801 void free_node_list() { 2802 if (_numa_used_node_list != NULL) { 2803 FREE_C_HEAP_ARRAY(int, _numa_used_node_list); 2804 } 2805 } 2806 2807 public: 2808 NUMANodeListHolder() { 2809 _numa_used_node_count = 0; 2810 _numa_used_node_list = NULL; 2811 // do rest of initialization in build routine (after function pointers are set up) 2812 } 2813 2814 ~NUMANodeListHolder() { 2815 free_node_list(); 2816 } 2817 2818 bool build() { 2819 DWORD_PTR proc_aff_mask; 2820 DWORD_PTR sys_aff_mask; 2821 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false; 2822 ULONG highest_node_number; 2823 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false; 2824 free_node_list(); 2825 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal); 2826 for (unsigned int i = 0; i <= highest_node_number; i++) { 2827 ULONGLONG proc_mask_numa_node; 2828 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false; 2829 if ((proc_aff_mask & proc_mask_numa_node)!=0) { 2830 _numa_used_node_list[_numa_used_node_count++] = i; 2831 } 2832 } 2833 return (_numa_used_node_count > 1); 2834 } 2835 2836 int get_count() { return _numa_used_node_count; } 2837 int get_node_list_entry(int n) { 2838 // for indexes out of range, returns -1 2839 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1); 2840 } 2841 2842 } numa_node_list_holder; 2843 2844 2845 2846 static size_t _large_page_size = 0; 2847 2848 static bool resolve_functions_for_large_page_init() { 2849 return os::Kernel32Dll::GetLargePageMinimumAvailable() && 2850 os::Advapi32Dll::AdvapiAvailable(); 2851 } 2852 2853 static bool request_lock_memory_privilege() { 2854 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2855 os::current_process_id()); 2856 2857 LUID luid; 2858 if (_hProcess != NULL && 2859 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2860 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2861 2862 TOKEN_PRIVILEGES tp; 2863 tp.PrivilegeCount = 1; 2864 tp.Privileges[0].Luid = luid; 2865 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2866 2867 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2868 // privilege. Check GetLastError() too. See MSDN document. 2869 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2870 (GetLastError() == ERROR_SUCCESS)) { 2871 return true; 2872 } 2873 } 2874 2875 return false; 2876 } 2877 2878 static void cleanup_after_large_page_init() { 2879 if (_hProcess) CloseHandle(_hProcess); 2880 _hProcess = NULL; 2881 if (_hToken) CloseHandle(_hToken); 2882 _hToken = NULL; 2883 } 2884 2885 static bool numa_interleaving_init() { 2886 bool success = false; 2887 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving); 2888 2889 // print a warning if UseNUMAInterleaving flag is specified on command line 2890 bool warn_on_failure = use_numa_interleaving_specified; 2891 #define WARN(msg) if (warn_on_failure) { warning(msg); } 2892 2893 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages) 2894 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2895 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity); 2896 2897 if (os::Kernel32Dll::NumaCallsAvailable()) { 2898 if (numa_node_list_holder.build()) { 2899 if (PrintMiscellaneous && Verbose) { 2900 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count()); 2901 for (int i = 0; i < numa_node_list_holder.get_count(); i++) { 2902 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i)); 2903 } 2904 tty->print("\n"); 2905 } 2906 success = true; 2907 } else { 2908 WARN("Process does not cover multiple NUMA nodes."); 2909 } 2910 } else { 2911 WARN("NUMA Interleaving is not supported by the operating system."); 2912 } 2913 if (!success) { 2914 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag."); 2915 } 2916 return success; 2917 #undef WARN 2918 } 2919 2920 // this routine is used whenever we need to reserve a contiguous VA range 2921 // but we need to make separate VirtualAlloc calls for each piece of the range 2922 // Reasons for doing this: 2923 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise) 2924 // * UseNUMAInterleaving requires a separate node for each piece 2925 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, 2926 DWORD prot, 2927 bool should_inject_error = false) { 2928 char * p_buf; 2929 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size 2930 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2931 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size; 2932 2933 // first reserve enough address space in advance since we want to be 2934 // able to break a single contiguous virtual address range into multiple 2935 // large page commits but WS2003 does not allow reserving large page space 2936 // so we just use 4K pages for reserve, this gives us a legal contiguous 2937 // address space. then we will deallocate that reservation, and re alloc 2938 // using large pages 2939 const size_t size_of_reserve = bytes + chunk_size; 2940 if (bytes > size_of_reserve) { 2941 // Overflowed. 2942 return NULL; 2943 } 2944 p_buf = (char *) VirtualAlloc(addr, 2945 size_of_reserve, // size of Reserve 2946 MEM_RESERVE, 2947 PAGE_READWRITE); 2948 // If reservation failed, return NULL 2949 if (p_buf == NULL) return NULL; 2950 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC); 2951 os::release_memory(p_buf, bytes + chunk_size); 2952 2953 // we still need to round up to a page boundary (in case we are using large pages) 2954 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size) 2955 // instead we handle this in the bytes_to_rq computation below 2956 p_buf = (char *) align_size_up((size_t)p_buf, page_size); 2957 2958 // now go through and allocate one chunk at a time until all bytes are 2959 // allocated 2960 size_t bytes_remaining = bytes; 2961 // An overflow of align_size_up() would have been caught above 2962 // in the calculation of size_of_reserve. 2963 char * next_alloc_addr = p_buf; 2964 HANDLE hProc = GetCurrentProcess(); 2965 2966 #ifdef ASSERT 2967 // Variable for the failure injection 2968 long ran_num = os::random(); 2969 size_t fail_after = ran_num % bytes; 2970 #endif 2971 2972 int count=0; 2973 while (bytes_remaining) { 2974 // select bytes_to_rq to get to the next chunk_size boundary 2975 2976 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size)); 2977 // Note allocate and commit 2978 char * p_new; 2979 2980 #ifdef ASSERT 2981 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after); 2982 #else 2983 const bool inject_error_now = false; 2984 #endif 2985 2986 if (inject_error_now) { 2987 p_new = NULL; 2988 } else { 2989 if (!UseNUMAInterleaving) { 2990 p_new = (char *) VirtualAlloc(next_alloc_addr, 2991 bytes_to_rq, 2992 flags, 2993 prot); 2994 } else { 2995 // get the next node to use from the used_node_list 2996 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected"); 2997 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count()); 2998 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc, 2999 next_alloc_addr, 3000 bytes_to_rq, 3001 flags, 3002 prot, 3003 node); 3004 } 3005 } 3006 3007 if (p_new == NULL) { 3008 // Free any allocated pages 3009 if (next_alloc_addr > p_buf) { 3010 // Some memory was committed so release it. 3011 size_t bytes_to_release = bytes - bytes_remaining; 3012 // NMT has yet to record any individual blocks, so it 3013 // need to create a dummy 'reserve' record to match 3014 // the release. 3015 MemTracker::record_virtual_memory_reserve((address)p_buf, 3016 bytes_to_release, CALLER_PC); 3017 os::release_memory(p_buf, bytes_to_release); 3018 } 3019 #ifdef ASSERT 3020 if (should_inject_error) { 3021 if (TracePageSizes && Verbose) { 3022 tty->print_cr("Reserving pages individually failed."); 3023 } 3024 } 3025 #endif 3026 return NULL; 3027 } 3028 3029 bytes_remaining -= bytes_to_rq; 3030 next_alloc_addr += bytes_to_rq; 3031 count++; 3032 } 3033 // Although the memory is allocated individually, it is returned as one. 3034 // NMT records it as one block. 3035 if ((flags & MEM_COMMIT) != 0) { 3036 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC); 3037 } else { 3038 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC); 3039 } 3040 3041 // made it this far, success 3042 return p_buf; 3043 } 3044 3045 3046 3047 void os::large_page_init() { 3048 if (!UseLargePages) return; 3049 3050 // print a warning if any large page related flag is specified on command line 3051 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 3052 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 3053 bool success = false; 3054 3055 #define WARN(msg) if (warn_on_failure) { warning(msg); } 3056 if (resolve_functions_for_large_page_init()) { 3057 if (request_lock_memory_privilege()) { 3058 size_t s = os::Kernel32Dll::GetLargePageMinimum(); 3059 if (s) { 3060 #if defined(IA32) || defined(AMD64) 3061 if (s > 4*M || LargePageSizeInBytes > 4*M) { 3062 WARN("JVM cannot use large pages bigger than 4mb."); 3063 } else { 3064 #endif 3065 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 3066 _large_page_size = LargePageSizeInBytes; 3067 } else { 3068 _large_page_size = s; 3069 } 3070 success = true; 3071 #if defined(IA32) || defined(AMD64) 3072 } 3073 #endif 3074 } else { 3075 WARN("Large page is not supported by the processor."); 3076 } 3077 } else { 3078 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 3079 } 3080 } else { 3081 WARN("Large page is not supported by the operating system."); 3082 } 3083 #undef WARN 3084 3085 const size_t default_page_size = (size_t) vm_page_size(); 3086 if (success && _large_page_size > default_page_size) { 3087 _page_sizes[0] = _large_page_size; 3088 _page_sizes[1] = default_page_size; 3089 _page_sizes[2] = 0; 3090 } 3091 3092 cleanup_after_large_page_init(); 3093 UseLargePages = success; 3094 } 3095 3096 // On win32, one cannot release just a part of reserved memory, it's an 3097 // all or nothing deal. When we split a reservation, we must break the 3098 // reservation into two reservations. 3099 void os::pd_split_reserved_memory(char *base, size_t size, size_t split, 3100 bool realloc) { 3101 if (size > 0) { 3102 release_memory(base, size); 3103 if (realloc) { 3104 reserve_memory(split, base); 3105 } 3106 if (size != split) { 3107 reserve_memory(size - split, base + split); 3108 } 3109 } 3110 } 3111 3112 // Multiple threads can race in this code but it's not possible to unmap small sections of 3113 // virtual space to get requested alignment, like posix-like os's. 3114 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe. 3115 char* os::reserve_memory_aligned(size_t size, size_t alignment) { 3116 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 3117 "Alignment must be a multiple of allocation granularity (page size)"); 3118 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 3119 3120 size_t extra_size = size + alignment; 3121 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 3122 3123 char* aligned_base = NULL; 3124 3125 do { 3126 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 3127 if (extra_base == NULL) { 3128 return NULL; 3129 } 3130 // Do manual alignment 3131 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 3132 3133 os::release_memory(extra_base, extra_size); 3134 3135 aligned_base = os::reserve_memory(size, aligned_base); 3136 3137 } while (aligned_base == NULL); 3138 3139 return aligned_base; 3140 } 3141 3142 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 3143 assert((size_t)addr % os::vm_allocation_granularity() == 0, 3144 "reserve alignment"); 3145 assert(bytes % os::vm_page_size() == 0, "reserve page size"); 3146 char* res; 3147 // note that if UseLargePages is on, all the areas that require interleaving 3148 // will go thru reserve_memory_special rather than thru here. 3149 bool use_individual = (UseNUMAInterleaving && !UseLargePages); 3150 if (!use_individual) { 3151 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 3152 } else { 3153 elapsedTimer reserveTimer; 3154 if (Verbose && PrintMiscellaneous) reserveTimer.start(); 3155 // in numa interleaving, we have to allocate pages individually 3156 // (well really chunks of NUMAInterleaveGranularity size) 3157 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE); 3158 if (res == NULL) { 3159 warning("NUMA page allocation failed"); 3160 } 3161 if (Verbose && PrintMiscellaneous) { 3162 reserveTimer.stop(); 3163 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes, 3164 reserveTimer.milliseconds(), reserveTimer.ticks()); 3165 } 3166 } 3167 assert(res == NULL || addr == NULL || addr == res, 3168 "Unexpected address from reserve."); 3169 3170 return res; 3171 } 3172 3173 // Reserve memory at an arbitrary address, only if that area is 3174 // available (and not reserved for something else). 3175 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3176 // Windows os::reserve_memory() fails of the requested address range is 3177 // not avilable. 3178 return reserve_memory(bytes, requested_addr); 3179 } 3180 3181 size_t os::large_page_size() { 3182 return _large_page_size; 3183 } 3184 3185 bool os::can_commit_large_page_memory() { 3186 // Windows only uses large page memory when the entire region is reserved 3187 // and committed in a single VirtualAlloc() call. This may change in the 3188 // future, but with Windows 2003 it's not possible to commit on demand. 3189 return false; 3190 } 3191 3192 bool os::can_execute_large_page_memory() { 3193 return true; 3194 } 3195 3196 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, 3197 bool exec) { 3198 assert(UseLargePages, "only for large pages"); 3199 3200 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { 3201 return NULL; // Fallback to small pages. 3202 } 3203 3204 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 3205 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3206 3207 // with large pages, there are two cases where we need to use Individual Allocation 3208 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003) 3209 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page 3210 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) { 3211 if (TracePageSizes && Verbose) { 3212 tty->print_cr("Reserving large pages individually."); 3213 } 3214 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError); 3215 if (p_buf == NULL) { 3216 // give an appropriate warning message 3217 if (UseNUMAInterleaving) { 3218 warning("NUMA large page allocation failed, UseLargePages flag ignored"); 3219 } 3220 if (UseLargePagesIndividualAllocation) { 3221 warning("Individually allocated large pages failed, " 3222 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 3223 } 3224 return NULL; 3225 } 3226 3227 return p_buf; 3228 3229 } else { 3230 if (TracePageSizes && Verbose) { 3231 tty->print_cr("Reserving large pages in a single large chunk."); 3232 } 3233 // normal policy just allocate it all at once 3234 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3235 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); 3236 if (res != NULL) { 3237 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC); 3238 } 3239 3240 return res; 3241 } 3242 } 3243 3244 bool os::release_memory_special(char* base, size_t bytes) { 3245 assert(base != NULL, "Sanity check"); 3246 return release_memory(base, bytes); 3247 } 3248 3249 void os::print_statistics() { 3250 } 3251 3252 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) { 3253 int err = os::get_last_error(); 3254 char buf[256]; 3255 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3256 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 3257 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3258 exec, buf_len != 0 ? buf : "<no_error_string>", err); 3259 } 3260 3261 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 3262 if (bytes == 0) { 3263 // Don't bother the OS with noops. 3264 return true; 3265 } 3266 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 3267 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 3268 // Don't attempt to print anything if the OS call fails. We're 3269 // probably low on resources, so the print itself may cause crashes. 3270 3271 // unless we have NUMAInterleaving enabled, the range of a commit 3272 // is always within a reserve covered by a single VirtualAlloc 3273 // in that case we can just do a single commit for the requested size 3274 if (!UseNUMAInterleaving) { 3275 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) { 3276 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3277 return false; 3278 } 3279 if (exec) { 3280 DWORD oldprot; 3281 // Windows doc says to use VirtualProtect to get execute permissions 3282 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) { 3283 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3284 return false; 3285 } 3286 } 3287 return true; 3288 } else { 3289 3290 // when NUMAInterleaving is enabled, the commit might cover a range that 3291 // came from multiple VirtualAlloc reserves (using allocate_pages_individually). 3292 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery 3293 // returns represents the number of bytes that can be committed in one step. 3294 size_t bytes_remaining = bytes; 3295 char * next_alloc_addr = addr; 3296 while (bytes_remaining > 0) { 3297 MEMORY_BASIC_INFORMATION alloc_info; 3298 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info)); 3299 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3300 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, 3301 PAGE_READWRITE) == NULL) { 3302 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3303 exec);) 3304 return false; 3305 } 3306 if (exec) { 3307 DWORD oldprot; 3308 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, 3309 PAGE_EXECUTE_READWRITE, &oldprot)) { 3310 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3311 exec);) 3312 return false; 3313 } 3314 } 3315 bytes_remaining -= bytes_to_rq; 3316 next_alloc_addr += bytes_to_rq; 3317 } 3318 } 3319 // if we made it this far, return true 3320 return true; 3321 } 3322 3323 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 3324 bool exec) { 3325 // alignment_hint is ignored on this OS 3326 return pd_commit_memory(addr, size, exec); 3327 } 3328 3329 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 3330 const char* mesg) { 3331 assert(mesg != NULL, "mesg must be specified"); 3332 if (!pd_commit_memory(addr, size, exec)) { 3333 warn_fail_commit_memory(addr, size, exec); 3334 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 3335 } 3336 } 3337 3338 void os::pd_commit_memory_or_exit(char* addr, size_t size, 3339 size_t alignment_hint, bool exec, 3340 const char* mesg) { 3341 // alignment_hint is ignored on this OS 3342 pd_commit_memory_or_exit(addr, size, exec, mesg); 3343 } 3344 3345 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3346 if (bytes == 0) { 3347 // Don't bother the OS with noops. 3348 return true; 3349 } 3350 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 3351 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 3352 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0); 3353 } 3354 3355 bool os::pd_release_memory(char* addr, size_t bytes) { 3356 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 3357 } 3358 3359 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 3360 return os::commit_memory(addr, size, !ExecMem); 3361 } 3362 3363 bool os::remove_stack_guard_pages(char* addr, size_t size) { 3364 return os::uncommit_memory(addr, size); 3365 } 3366 3367 // Set protections specified 3368 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3369 bool is_committed) { 3370 unsigned int p = 0; 3371 switch (prot) { 3372 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 3373 case MEM_PROT_READ: p = PAGE_READONLY; break; 3374 case MEM_PROT_RW: p = PAGE_READWRITE; break; 3375 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 3376 default: 3377 ShouldNotReachHere(); 3378 } 3379 3380 DWORD old_status; 3381 3382 // Strange enough, but on Win32 one can change protection only for committed 3383 // memory, not a big deal anyway, as bytes less or equal than 64K 3384 if (!is_committed) { 3385 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX, 3386 "cannot commit protection page"); 3387 } 3388 // One cannot use os::guard_memory() here, as on Win32 guard page 3389 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 3390 // 3391 // Pages in the region become guard pages. Any attempt to access a guard page 3392 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 3393 // the guard page status. Guard pages thus act as a one-time access alarm. 3394 return VirtualProtect(addr, bytes, p, &old_status) != 0; 3395 } 3396 3397 bool os::guard_memory(char* addr, size_t bytes) { 3398 DWORD old_status; 3399 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 3400 } 3401 3402 bool os::unguard_memory(char* addr, size_t bytes) { 3403 DWORD old_status; 3404 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 3405 } 3406 3407 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3408 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3409 void os::numa_make_global(char *addr, size_t bytes) { } 3410 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 3411 bool os::numa_topology_changed() { return false; } 3412 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); } 3413 int os::numa_get_group_id() { return 0; } 3414 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 3415 if (numa_node_list_holder.get_count() == 0 && size > 0) { 3416 // Provide an answer for UMA systems 3417 ids[0] = 0; 3418 return 1; 3419 } else { 3420 // check for size bigger than actual groups_num 3421 size = MIN2(size, numa_get_groups_num()); 3422 for (int i = 0; i < (int)size; i++) { 3423 ids[i] = numa_node_list_holder.get_node_list_entry(i); 3424 } 3425 return size; 3426 } 3427 } 3428 3429 bool os::get_page_info(char *start, page_info* info) { 3430 return false; 3431 } 3432 3433 char *os::scan_pages(char *start, char* end, page_info* page_expected, 3434 page_info* page_found) { 3435 return end; 3436 } 3437 3438 char* os::non_memory_address_word() { 3439 // Must never look like an address returned by reserve_memory, 3440 // even in its subfields (as defined by the CPU immediate fields, 3441 // if the CPU splits constants across multiple instructions). 3442 return (char*)-1; 3443 } 3444 3445 #define MAX_ERROR_COUNT 100 3446 #define SYS_THREAD_ERROR 0xffffffffUL 3447 3448 void os::pd_start_thread(Thread* thread) { 3449 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 3450 // Returns previous suspend state: 3451 // 0: Thread was not suspended 3452 // 1: Thread is running now 3453 // >1: Thread is still suspended. 3454 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3455 } 3456 3457 class HighResolutionInterval : public CHeapObj<mtThread> { 3458 // The default timer resolution seems to be 10 milliseconds. 3459 // (Where is this written down?) 3460 // If someone wants to sleep for only a fraction of the default, 3461 // then we set the timer resolution down to 1 millisecond for 3462 // the duration of their interval. 3463 // We carefully set the resolution back, since otherwise we 3464 // seem to incur an overhead (3%?) that we don't need. 3465 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 3466 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 3467 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 3468 // timeBeginPeriod() if the relative error exceeded some threshold. 3469 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 3470 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 3471 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 3472 // resolution timers running. 3473 private: 3474 jlong resolution; 3475 public: 3476 HighResolutionInterval(jlong ms) { 3477 resolution = ms % 10L; 3478 if (resolution != 0) { 3479 MMRESULT result = timeBeginPeriod(1L); 3480 } 3481 } 3482 ~HighResolutionInterval() { 3483 if (resolution != 0) { 3484 MMRESULT result = timeEndPeriod(1L); 3485 } 3486 resolution = 0L; 3487 } 3488 }; 3489 3490 int os::sleep(Thread* thread, jlong ms, bool interruptable) { 3491 jlong limit = (jlong) MAXDWORD; 3492 3493 while (ms > limit) { 3494 int res; 3495 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) { 3496 return res; 3497 } 3498 ms -= limit; 3499 } 3500 3501 assert(thread == Thread::current(), "thread consistency check"); 3502 OSThread* osthread = thread->osthread(); 3503 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 3504 int result; 3505 if (interruptable) { 3506 assert(thread->is_Java_thread(), "must be java thread"); 3507 JavaThread *jt = (JavaThread *) thread; 3508 ThreadBlockInVM tbivm(jt); 3509 3510 jt->set_suspend_equivalent(); 3511 // cleared by handle_special_suspend_equivalent_condition() or 3512 // java_suspend_self() via check_and_wait_while_suspended() 3513 3514 HANDLE events[1]; 3515 events[0] = osthread->interrupt_event(); 3516 HighResolutionInterval *phri=NULL; 3517 if (!ForceTimeHighResolution) { 3518 phri = new HighResolutionInterval(ms); 3519 } 3520 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 3521 result = OS_TIMEOUT; 3522 } else { 3523 ResetEvent(osthread->interrupt_event()); 3524 osthread->set_interrupted(false); 3525 result = OS_INTRPT; 3526 } 3527 delete phri; //if it is NULL, harmless 3528 3529 // were we externally suspended while we were waiting? 3530 jt->check_and_wait_while_suspended(); 3531 } else { 3532 assert(!thread->is_Java_thread(), "must not be java thread"); 3533 Sleep((long) ms); 3534 result = OS_TIMEOUT; 3535 } 3536 return result; 3537 } 3538 3539 // Short sleep, direct OS call. 3540 // 3541 // ms = 0, means allow others (if any) to run. 3542 // 3543 void os::naked_short_sleep(jlong ms) { 3544 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3545 Sleep(ms); 3546 } 3547 3548 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3549 void os::infinite_sleep() { 3550 while (true) { // sleep forever ... 3551 Sleep(100000); // ... 100 seconds at a time 3552 } 3553 } 3554 3555 typedef BOOL (WINAPI * STTSignature)(void); 3556 3557 void os::naked_yield() { 3558 // Use either SwitchToThread() or Sleep(0) 3559 // Consider passing back the return value from SwitchToThread(). 3560 if (os::Kernel32Dll::SwitchToThreadAvailable()) { 3561 SwitchToThread(); 3562 } else { 3563 Sleep(0); 3564 } 3565 } 3566 3567 // Win32 only gives you access to seven real priorities at a time, 3568 // so we compress Java's ten down to seven. It would be better 3569 // if we dynamically adjusted relative priorities. 3570 3571 int os::java_to_os_priority[CriticalPriority + 1] = { 3572 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3573 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3574 THREAD_PRIORITY_LOWEST, // 2 3575 THREAD_PRIORITY_BELOW_NORMAL, // 3 3576 THREAD_PRIORITY_BELOW_NORMAL, // 4 3577 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3578 THREAD_PRIORITY_NORMAL, // 6 3579 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3580 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3581 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3582 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority 3583 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority 3584 }; 3585 3586 int prio_policy1[CriticalPriority + 1] = { 3587 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3588 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3589 THREAD_PRIORITY_LOWEST, // 2 3590 THREAD_PRIORITY_BELOW_NORMAL, // 3 3591 THREAD_PRIORITY_BELOW_NORMAL, // 4 3592 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3593 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3594 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3595 THREAD_PRIORITY_HIGHEST, // 8 3596 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3597 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority 3598 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority 3599 }; 3600 3601 static int prio_init() { 3602 // If ThreadPriorityPolicy is 1, switch tables 3603 if (ThreadPriorityPolicy == 1) { 3604 int i; 3605 for (i = 0; i < CriticalPriority + 1; i++) { 3606 os::java_to_os_priority[i] = prio_policy1[i]; 3607 } 3608 } 3609 if (UseCriticalJavaThreadPriority) { 3610 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 3611 } 3612 return 0; 3613 } 3614 3615 OSReturn os::set_native_priority(Thread* thread, int priority) { 3616 if (!UseThreadPriorities) return OS_OK; 3617 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3618 return ret ? OS_OK : OS_ERR; 3619 } 3620 3621 OSReturn os::get_native_priority(const Thread* const thread, 3622 int* priority_ptr) { 3623 if (!UseThreadPriorities) { 3624 *priority_ptr = java_to_os_priority[NormPriority]; 3625 return OS_OK; 3626 } 3627 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3628 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3629 assert(false, "GetThreadPriority failed"); 3630 return OS_ERR; 3631 } 3632 *priority_ptr = os_prio; 3633 return OS_OK; 3634 } 3635 3636 3637 // Hint to the underlying OS that a task switch would not be good. 3638 // Void return because it's a hint and can fail. 3639 void os::hint_no_preempt() {} 3640 3641 void os::interrupt(Thread* thread) { 3642 assert(!thread->is_Java_thread() || Thread::current() == thread || 3643 Threads_lock->owned_by_self(), 3644 "possibility of dangling Thread pointer"); 3645 3646 OSThread* osthread = thread->osthread(); 3647 osthread->set_interrupted(true); 3648 // More than one thread can get here with the same value of osthread, 3649 // resulting in multiple notifications. We do, however, want the store 3650 // to interrupted() to be visible to other threads before we post 3651 // the interrupt event. 3652 OrderAccess::release(); 3653 SetEvent(osthread->interrupt_event()); 3654 // For JSR166: unpark after setting status 3655 if (thread->is_Java_thread()) { 3656 ((JavaThread*)thread)->parker()->unpark(); 3657 } 3658 3659 ParkEvent * ev = thread->_ParkEvent; 3660 if (ev != NULL) ev->unpark(); 3661 } 3662 3663 3664 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3665 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3666 "possibility of dangling Thread pointer"); 3667 3668 OSThread* osthread = thread->osthread(); 3669 // There is no synchronization between the setting of the interrupt 3670 // and it being cleared here. It is critical - see 6535709 - that 3671 // we only clear the interrupt state, and reset the interrupt event, 3672 // if we are going to report that we were indeed interrupted - else 3673 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups 3674 // depending on the timing. By checking thread interrupt event to see 3675 // if the thread gets real interrupt thus prevent spurious wakeup. 3676 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0); 3677 if (interrupted && clear_interrupted) { 3678 osthread->set_interrupted(false); 3679 ResetEvent(osthread->interrupt_event()); 3680 } // Otherwise leave the interrupted state alone 3681 3682 return interrupted; 3683 } 3684 3685 // Get's a pc (hint) for a running thread. Currently used only for profiling. 3686 ExtendedPC os::get_thread_pc(Thread* thread) { 3687 CONTEXT context; 3688 context.ContextFlags = CONTEXT_CONTROL; 3689 HANDLE handle = thread->osthread()->thread_handle(); 3690 #ifdef _M_IA64 3691 assert(0, "Fix get_thread_pc"); 3692 return ExtendedPC(NULL); 3693 #else 3694 if (GetThreadContext(handle, &context)) { 3695 #ifdef _M_AMD64 3696 return ExtendedPC((address) context.Rip); 3697 #else 3698 return ExtendedPC((address) context.Eip); 3699 #endif 3700 } else { 3701 return ExtendedPC(NULL); 3702 } 3703 #endif 3704 } 3705 3706 // GetCurrentThreadId() returns DWORD 3707 intx os::current_thread_id() { return GetCurrentThreadId(); } 3708 3709 static int _initial_pid = 0; 3710 3711 int os::current_process_id() { 3712 return (_initial_pid ? _initial_pid : _getpid()); 3713 } 3714 3715 int os::win32::_vm_page_size = 0; 3716 int os::win32::_vm_allocation_granularity = 0; 3717 int os::win32::_processor_type = 0; 3718 // Processor level is not available on non-NT systems, use vm_version instead 3719 int os::win32::_processor_level = 0; 3720 julong os::win32::_physical_memory = 0; 3721 size_t os::win32::_default_stack_size = 0; 3722 3723 intx os::win32::_os_thread_limit = 0; 3724 volatile intx os::win32::_os_thread_count = 0; 3725 3726 bool os::win32::_is_nt = false; 3727 bool os::win32::_is_windows_2003 = false; 3728 bool os::win32::_is_windows_server = false; 3729 3730 // 6573254 3731 // Currently, the bug is observed across all the supported Windows releases, 3732 // including the latest one (as of this writing - Windows Server 2012 R2) 3733 bool os::win32::_has_exit_bug = true; 3734 bool os::win32::_has_performance_count = 0; 3735 3736 void os::win32::initialize_system_info() { 3737 SYSTEM_INFO si; 3738 GetSystemInfo(&si); 3739 _vm_page_size = si.dwPageSize; 3740 _vm_allocation_granularity = si.dwAllocationGranularity; 3741 _processor_type = si.dwProcessorType; 3742 _processor_level = si.wProcessorLevel; 3743 set_processor_count(si.dwNumberOfProcessors); 3744 3745 MEMORYSTATUSEX ms; 3746 ms.dwLength = sizeof(ms); 3747 3748 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3749 // dwMemoryLoad (% of memory in use) 3750 GlobalMemoryStatusEx(&ms); 3751 _physical_memory = ms.ullTotalPhys; 3752 3753 OSVERSIONINFOEX oi; 3754 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 3755 GetVersionEx((OSVERSIONINFO*)&oi); 3756 switch (oi.dwPlatformId) { 3757 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 3758 case VER_PLATFORM_WIN32_NT: 3759 _is_nt = true; 3760 { 3761 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3762 if (os_vers == 5002) { 3763 _is_windows_2003 = true; 3764 } 3765 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER || 3766 oi.wProductType == VER_NT_SERVER) { 3767 _is_windows_server = true; 3768 } 3769 } 3770 break; 3771 default: fatal("Unknown platform"); 3772 } 3773 3774 _default_stack_size = os::current_stack_size(); 3775 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3776 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3777 "stack size not a multiple of page size"); 3778 3779 initialize_performance_counter(); 3780 } 3781 3782 3783 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, 3784 int ebuflen) { 3785 char path[MAX_PATH]; 3786 DWORD size; 3787 DWORD pathLen = (DWORD)sizeof(path); 3788 HINSTANCE result = NULL; 3789 3790 // only allow library name without path component 3791 assert(strchr(name, '\\') == NULL, "path not allowed"); 3792 assert(strchr(name, ':') == NULL, "path not allowed"); 3793 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) { 3794 jio_snprintf(ebuf, ebuflen, 3795 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name); 3796 return NULL; 3797 } 3798 3799 // search system directory 3800 if ((size = GetSystemDirectory(path, pathLen)) > 0) { 3801 if (size >= pathLen) { 3802 return NULL; // truncated 3803 } 3804 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3805 return NULL; // truncated 3806 } 3807 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3808 return result; 3809 } 3810 } 3811 3812 // try Windows directory 3813 if ((size = GetWindowsDirectory(path, pathLen)) > 0) { 3814 if (size >= pathLen) { 3815 return NULL; // truncated 3816 } 3817 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3818 return NULL; // truncated 3819 } 3820 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3821 return result; 3822 } 3823 } 3824 3825 jio_snprintf(ebuf, ebuflen, 3826 "os::win32::load_windows_dll() cannot load %s from system directories.", name); 3827 return NULL; 3828 } 3829 3830 #define EXIT_TIMEOUT 300000 /* 5 minutes */ 3831 3832 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) { 3833 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect); 3834 return TRUE; 3835 } 3836 3837 int os::win32::exit_process_or_thread(Ept what, int exit_code) { 3838 // Basic approach: 3839 // - Each exiting thread registers its intent to exit and then does so. 3840 // - A thread trying to terminate the process must wait for all 3841 // threads currently exiting to complete their exit. 3842 3843 if (os::win32::has_exit_bug()) { 3844 // The array holds handles of the threads that have started exiting by calling 3845 // _endthreadex(). 3846 // Should be large enough to avoid blocking the exiting thread due to lack of 3847 // a free slot. 3848 static HANDLE handles[MAXIMUM_WAIT_OBJECTS]; 3849 static int handle_count = 0; 3850 3851 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT; 3852 static CRITICAL_SECTION crit_sect; 3853 static volatile jint process_exiting = 0; 3854 int i, j; 3855 DWORD res; 3856 HANDLE hproc, hthr; 3857 3858 // The first thread that reached this point, initializes the critical section. 3859 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) { 3860 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__); 3861 } else if (OrderAccess::load_acquire(&process_exiting) == 0) { 3862 EnterCriticalSection(&crit_sect); 3863 3864 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) { 3865 // Remove from the array those handles of the threads that have completed exiting. 3866 for (i = 0, j = 0; i < handle_count; ++i) { 3867 res = WaitForSingleObject(handles[i], 0 /* don't wait */); 3868 if (res == WAIT_TIMEOUT) { 3869 handles[j++] = handles[i]; 3870 } else { 3871 if (res == WAIT_FAILED) { 3872 warning("WaitForSingleObject failed (%u) in %s: %d\n", 3873 GetLastError(), __FILE__, __LINE__); 3874 } 3875 // Don't keep the handle, if we failed waiting for it. 3876 CloseHandle(handles[i]); 3877 } 3878 } 3879 3880 // If there's no free slot in the array of the kept handles, we'll have to 3881 // wait until at least one thread completes exiting. 3882 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) { 3883 // Raise the priority of the oldest exiting thread to increase its chances 3884 // to complete sooner. 3885 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL); 3886 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT); 3887 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) { 3888 i = (res - WAIT_OBJECT_0); 3889 handle_count = MAXIMUM_WAIT_OBJECTS - 1; 3890 for (; i < handle_count; ++i) { 3891 handles[i] = handles[i + 1]; 3892 } 3893 } else { 3894 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3895 (res == WAIT_FAILED ? "failed" : "timed out"), 3896 GetLastError(), __FILE__, __LINE__); 3897 // Don't keep handles, if we failed waiting for them. 3898 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) { 3899 CloseHandle(handles[i]); 3900 } 3901 handle_count = 0; 3902 } 3903 } 3904 3905 // Store a duplicate of the current thread handle in the array of handles. 3906 hproc = GetCurrentProcess(); 3907 hthr = GetCurrentThread(); 3908 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count], 3909 0, FALSE, DUPLICATE_SAME_ACCESS)) { 3910 warning("DuplicateHandle failed (%u) in %s: %d\n", 3911 GetLastError(), __FILE__, __LINE__); 3912 } else { 3913 ++handle_count; 3914 } 3915 3916 // The current exiting thread has stored its handle in the array, and now 3917 // should leave the critical section before calling _endthreadex(). 3918 3919 } else if (what != EPT_THREAD) { 3920 if (handle_count > 0) { 3921 // Before ending the process, make sure all the threads that had called 3922 // _endthreadex() completed. 3923 3924 // Set the priority level of the current thread to the same value as 3925 // the priority level of exiting threads. 3926 // This is to ensure it will be given a fair chance to execute if 3927 // the timeout expires. 3928 hthr = GetCurrentThread(); 3929 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL); 3930 for (i = 0; i < handle_count; ++i) { 3931 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL); 3932 } 3933 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT); 3934 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) { 3935 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3936 (res == WAIT_FAILED ? "failed" : "timed out"), 3937 GetLastError(), __FILE__, __LINE__); 3938 } 3939 for (i = 0; i < handle_count; ++i) { 3940 CloseHandle(handles[i]); 3941 } 3942 handle_count = 0; 3943 } 3944 3945 OrderAccess::release_store(&process_exiting, 1); 3946 } 3947 3948 LeaveCriticalSection(&crit_sect); 3949 } 3950 3951 if (what == EPT_THREAD) { 3952 while (OrderAccess::load_acquire(&process_exiting) != 0) { 3953 // Some other thread is about to call exit(), so we 3954 // don't let the current thread proceed to _endthreadex() 3955 SuspendThread(GetCurrentThread()); 3956 // Avoid busy-wait loop, if SuspendThread() failed. 3957 Sleep(EXIT_TIMEOUT); 3958 } 3959 } 3960 } 3961 3962 // We are here if either 3963 // - there's no 'race at exit' bug on this OS release; 3964 // - initialization of the critical section failed (unlikely); 3965 // - the current thread has stored its handle and left the critical section; 3966 // - the process-exiting thread has raised the flag and left the critical section. 3967 if (what == EPT_THREAD) { 3968 _endthreadex((unsigned)exit_code); 3969 } else if (what == EPT_PROCESS) { 3970 ::exit(exit_code); 3971 } else { 3972 _exit(exit_code); 3973 } 3974 3975 // Should not reach here 3976 return exit_code; 3977 } 3978 3979 #undef EXIT_TIMEOUT 3980 3981 void os::win32::setmode_streams() { 3982 _setmode(_fileno(stdin), _O_BINARY); 3983 _setmode(_fileno(stdout), _O_BINARY); 3984 _setmode(_fileno(stderr), _O_BINARY); 3985 } 3986 3987 3988 bool os::is_debugger_attached() { 3989 return IsDebuggerPresent() ? true : false; 3990 } 3991 3992 3993 void os::wait_for_keypress_at_exit(void) { 3994 if (PauseAtExit) { 3995 fprintf(stderr, "Press any key to continue...\n"); 3996 fgetc(stdin); 3997 } 3998 } 3999 4000 4001 int os::message_box(const char* title, const char* message) { 4002 int result = MessageBox(NULL, message, title, 4003 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 4004 return result == IDYES; 4005 } 4006 4007 #ifndef PRODUCT 4008 #ifndef _WIN64 4009 // Helpers to check whether NX protection is enabled 4010 int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 4011 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 4012 pex->ExceptionRecord->NumberParameters > 0 && 4013 pex->ExceptionRecord->ExceptionInformation[0] == 4014 EXCEPTION_INFO_EXEC_VIOLATION) { 4015 return EXCEPTION_EXECUTE_HANDLER; 4016 } 4017 return EXCEPTION_CONTINUE_SEARCH; 4018 } 4019 4020 void nx_check_protection() { 4021 // If NX is enabled we'll get an exception calling into code on the stack 4022 char code[] = { (char)0xC3 }; // ret 4023 void *code_ptr = (void *)code; 4024 __try { 4025 __asm call code_ptr 4026 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 4027 tty->print_raw_cr("NX protection detected."); 4028 } 4029 } 4030 #endif // _WIN64 4031 #endif // PRODUCT 4032 4033 // this is called _before_ the global arguments have been parsed 4034 void os::init(void) { 4035 _initial_pid = _getpid(); 4036 4037 init_random(1234567); 4038 4039 win32::initialize_system_info(); 4040 win32::setmode_streams(); 4041 init_page_sizes((size_t) win32::vm_page_size()); 4042 4043 // This may be overridden later when argument processing is done. 4044 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, 4045 os::win32::is_windows_2003()); 4046 4047 // Initialize main_process and main_thread 4048 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 4049 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 4050 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 4051 fatal("DuplicateHandle failed\n"); 4052 } 4053 main_thread_id = (int) GetCurrentThreadId(); 4054 4055 // initialize fast thread access - only used for 32-bit 4056 win32::initialize_thread_ptr_offset(); 4057 } 4058 4059 // To install functions for atexit processing 4060 extern "C" { 4061 static void perfMemory_exit_helper() { 4062 perfMemory_exit(); 4063 } 4064 } 4065 4066 static jint initSock(); 4067 4068 // this is called _after_ the global arguments have been parsed 4069 jint os::init_2(void) { 4070 // Allocate a single page and mark it as readable for safepoint polling 4071 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 4072 guarantee(polling_page != NULL, "Reserve Failed for polling page"); 4073 4074 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 4075 guarantee(return_page != NULL, "Commit Failed for polling page"); 4076 4077 os::set_polling_page(polling_page); 4078 4079 #ifndef PRODUCT 4080 if (Verbose && PrintMiscellaneous) { 4081 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", 4082 (intptr_t)polling_page); 4083 } 4084 #endif 4085 4086 if (!UseMembar) { 4087 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE); 4088 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 4089 4090 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE); 4091 guarantee(return_page != NULL, "Commit Failed for memory serialize page"); 4092 4093 os::set_memory_serialize_page(mem_serialize_page); 4094 4095 #ifndef PRODUCT 4096 if (Verbose && PrintMiscellaneous) { 4097 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", 4098 (intptr_t)mem_serialize_page); 4099 } 4100 #endif 4101 } 4102 4103 // Setup Windows Exceptions 4104 4105 // for debugging float code generation bugs 4106 if (ForceFloatExceptions) { 4107 #ifndef _WIN64 4108 static long fp_control_word = 0; 4109 __asm { fstcw fp_control_word } 4110 // see Intel PPro Manual, Vol. 2, p 7-16 4111 const long precision = 0x20; 4112 const long underflow = 0x10; 4113 const long overflow = 0x08; 4114 const long zero_div = 0x04; 4115 const long denorm = 0x02; 4116 const long invalid = 0x01; 4117 fp_control_word |= invalid; 4118 __asm { fldcw fp_control_word } 4119 #endif 4120 } 4121 4122 // If stack_commit_size is 0, windows will reserve the default size, 4123 // but only commit a small portion of it. 4124 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 4125 size_t default_reserve_size = os::win32::default_stack_size(); 4126 size_t actual_reserve_size = stack_commit_size; 4127 if (stack_commit_size < default_reserve_size) { 4128 // If stack_commit_size == 0, we want this too 4129 actual_reserve_size = default_reserve_size; 4130 } 4131 4132 // Check minimum allowable stack size for thread creation and to initialize 4133 // the java system classes, including StackOverflowError - depends on page 4134 // size. Add a page for compiler2 recursion in main thread. 4135 // Add in 2*BytesPerWord times page size to account for VM stack during 4136 // class initialization depending on 32 or 64 bit VM. 4137 size_t min_stack_allowed = 4138 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 4139 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size(); 4140 if (actual_reserve_size < min_stack_allowed) { 4141 tty->print_cr("\nThe stack size specified is too small, " 4142 "Specify at least %dk", 4143 min_stack_allowed / K); 4144 return JNI_ERR; 4145 } 4146 4147 JavaThread::set_stack_size_at_create(stack_commit_size); 4148 4149 // Calculate theoretical max. size of Threads to guard gainst artifical 4150 // out-of-memory situations, where all available address-space has been 4151 // reserved by thread stacks. 4152 assert(actual_reserve_size != 0, "Must have a stack"); 4153 4154 // Calculate the thread limit when we should start doing Virtual Memory 4155 // banging. Currently when the threads will have used all but 200Mb of space. 4156 // 4157 // TODO: consider performing a similar calculation for commit size instead 4158 // as reserve size, since on a 64-bit platform we'll run into that more 4159 // often than running out of virtual memory space. We can use the 4160 // lower value of the two calculations as the os_thread_limit. 4161 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 4162 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 4163 4164 // at exit methods are called in the reverse order of their registration. 4165 // there is no limit to the number of functions registered. atexit does 4166 // not set errno. 4167 4168 if (PerfAllowAtExitRegistration) { 4169 // only register atexit functions if PerfAllowAtExitRegistration is set. 4170 // atexit functions can be delayed until process exit time, which 4171 // can be problematic for embedded VM situations. Embedded VMs should 4172 // call DestroyJavaVM() to assure that VM resources are released. 4173 4174 // note: perfMemory_exit_helper atexit function may be removed in 4175 // the future if the appropriate cleanup code can be added to the 4176 // VM_Exit VMOperation's doit method. 4177 if (atexit(perfMemory_exit_helper) != 0) { 4178 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 4179 } 4180 } 4181 4182 #ifndef _WIN64 4183 // Print something if NX is enabled (win32 on AMD64) 4184 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 4185 #endif 4186 4187 // initialize thread priority policy 4188 prio_init(); 4189 4190 if (UseNUMA && !ForceNUMA) { 4191 UseNUMA = false; // We don't fully support this yet 4192 } 4193 4194 if (UseNUMAInterleaving) { 4195 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag 4196 bool success = numa_interleaving_init(); 4197 if (!success) UseNUMAInterleaving = false; 4198 } 4199 4200 if (initSock() != JNI_OK) { 4201 return JNI_ERR; 4202 } 4203 4204 return JNI_OK; 4205 } 4206 4207 // Mark the polling page as unreadable 4208 void os::make_polling_page_unreadable(void) { 4209 DWORD old_status; 4210 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4211 PAGE_NOACCESS, &old_status)) { 4212 fatal("Could not disable polling page"); 4213 } 4214 } 4215 4216 // Mark the polling page as readable 4217 void os::make_polling_page_readable(void) { 4218 DWORD old_status; 4219 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4220 PAGE_READONLY, &old_status)) { 4221 fatal("Could not enable polling page"); 4222 } 4223 } 4224 4225 4226 int os::stat(const char *path, struct stat *sbuf) { 4227 char pathbuf[MAX_PATH]; 4228 if (strlen(path) > MAX_PATH - 1) { 4229 errno = ENAMETOOLONG; 4230 return -1; 4231 } 4232 os::native_path(strcpy(pathbuf, path)); 4233 int ret = ::stat(pathbuf, sbuf); 4234 if (sbuf != NULL && UseUTCFileTimestamp) { 4235 // Fix for 6539723. st_mtime returned from stat() is dependent on 4236 // the system timezone and so can return different values for the 4237 // same file if/when daylight savings time changes. This adjustment 4238 // makes sure the same timestamp is returned regardless of the TZ. 4239 // 4240 // See: 4241 // http://msdn.microsoft.com/library/ 4242 // default.asp?url=/library/en-us/sysinfo/base/ 4243 // time_zone_information_str.asp 4244 // and 4245 // http://msdn.microsoft.com/library/default.asp?url= 4246 // /library/en-us/sysinfo/base/settimezoneinformation.asp 4247 // 4248 // NOTE: there is a insidious bug here: If the timezone is changed 4249 // after the call to stat() but before 'GetTimeZoneInformation()', then 4250 // the adjustment we do here will be wrong and we'll return the wrong 4251 // value (which will likely end up creating an invalid class data 4252 // archive). Absent a better API for this, or some time zone locking 4253 // mechanism, we'll have to live with this risk. 4254 TIME_ZONE_INFORMATION tz; 4255 DWORD tzid = GetTimeZoneInformation(&tz); 4256 int daylightBias = 4257 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 4258 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 4259 } 4260 return ret; 4261 } 4262 4263 4264 #define FT2INT64(ft) \ 4265 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 4266 4267 4268 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4269 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4270 // of a thread. 4271 // 4272 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4273 // the fast estimate available on the platform. 4274 4275 // current_thread_cpu_time() is not optimized for Windows yet 4276 jlong os::current_thread_cpu_time() { 4277 // return user + sys since the cost is the same 4278 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 4279 } 4280 4281 jlong os::thread_cpu_time(Thread* thread) { 4282 // consistent with what current_thread_cpu_time() returns. 4283 return os::thread_cpu_time(thread, true /* user+sys */); 4284 } 4285 4286 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4287 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4288 } 4289 4290 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 4291 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 4292 // If this function changes, os::is_thread_cpu_time_supported() should too 4293 if (os::win32::is_nt()) { 4294 FILETIME CreationTime; 4295 FILETIME ExitTime; 4296 FILETIME KernelTime; 4297 FILETIME UserTime; 4298 4299 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime, 4300 &ExitTime, &KernelTime, &UserTime) == 0) { 4301 return -1; 4302 } else if (user_sys_cpu_time) { 4303 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 4304 } else { 4305 return FT2INT64(UserTime) * 100; 4306 } 4307 } else { 4308 return (jlong) timeGetTime() * 1000000; 4309 } 4310 } 4311 4312 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4313 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4314 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4315 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4316 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4317 } 4318 4319 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4320 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4321 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4322 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4323 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4324 } 4325 4326 bool os::is_thread_cpu_time_supported() { 4327 // see os::thread_cpu_time 4328 if (os::win32::is_nt()) { 4329 FILETIME CreationTime; 4330 FILETIME ExitTime; 4331 FILETIME KernelTime; 4332 FILETIME UserTime; 4333 4334 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime, 4335 &KernelTime, &UserTime) == 0) { 4336 return false; 4337 } else { 4338 return true; 4339 } 4340 } else { 4341 return false; 4342 } 4343 } 4344 4345 // Windows does't provide a loadavg primitive so this is stubbed out for now. 4346 // It does have primitives (PDH API) to get CPU usage and run queue length. 4347 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 4348 // If we wanted to implement loadavg on Windows, we have a few options: 4349 // 4350 // a) Query CPU usage and run queue length and "fake" an answer by 4351 // returning the CPU usage if it's under 100%, and the run queue 4352 // length otherwise. It turns out that querying is pretty slow 4353 // on Windows, on the order of 200 microseconds on a fast machine. 4354 // Note that on the Windows the CPU usage value is the % usage 4355 // since the last time the API was called (and the first call 4356 // returns 100%), so we'd have to deal with that as well. 4357 // 4358 // b) Sample the "fake" answer using a sampling thread and store 4359 // the answer in a global variable. The call to loadavg would 4360 // just return the value of the global, avoiding the slow query. 4361 // 4362 // c) Sample a better answer using exponential decay to smooth the 4363 // value. This is basically the algorithm used by UNIX kernels. 4364 // 4365 // Note that sampling thread starvation could affect both (b) and (c). 4366 int os::loadavg(double loadavg[], int nelem) { 4367 return -1; 4368 } 4369 4370 4371 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 4372 bool os::dont_yield() { 4373 return DontYieldALot; 4374 } 4375 4376 // This method is a slightly reworked copy of JDK's sysOpen 4377 // from src/windows/hpi/src/sys_api_md.c 4378 4379 int os::open(const char *path, int oflag, int mode) { 4380 char pathbuf[MAX_PATH]; 4381 4382 if (strlen(path) > MAX_PATH - 1) { 4383 errno = ENAMETOOLONG; 4384 return -1; 4385 } 4386 os::native_path(strcpy(pathbuf, path)); 4387 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 4388 } 4389 4390 FILE* os::open(int fd, const char* mode) { 4391 return ::_fdopen(fd, mode); 4392 } 4393 4394 // Is a (classpath) directory empty? 4395 bool os::dir_is_empty(const char* path) { 4396 WIN32_FIND_DATA fd; 4397 HANDLE f = FindFirstFile(path, &fd); 4398 if (f == INVALID_HANDLE_VALUE) { 4399 return true; 4400 } 4401 FindClose(f); 4402 return false; 4403 } 4404 4405 // create binary file, rewriting existing file if required 4406 int os::create_binary_file(const char* path, bool rewrite_existing) { 4407 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 4408 if (!rewrite_existing) { 4409 oflags |= _O_EXCL; 4410 } 4411 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 4412 } 4413 4414 // return current position of file pointer 4415 jlong os::current_file_offset(int fd) { 4416 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 4417 } 4418 4419 // move file pointer to the specified offset 4420 jlong os::seek_to_file_offset(int fd, jlong offset) { 4421 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 4422 } 4423 4424 4425 jlong os::lseek(int fd, jlong offset, int whence) { 4426 return (jlong) ::_lseeki64(fd, offset, whence); 4427 } 4428 4429 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 4430 OVERLAPPED ov; 4431 DWORD nread; 4432 BOOL result; 4433 4434 ZeroMemory(&ov, sizeof(ov)); 4435 ov.Offset = (DWORD)offset; 4436 ov.OffsetHigh = (DWORD)(offset >> 32); 4437 4438 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4439 4440 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov); 4441 4442 return result ? nread : 0; 4443 } 4444 4445 4446 // This method is a slightly reworked copy of JDK's sysNativePath 4447 // from src/windows/hpi/src/path_md.c 4448 4449 // Convert a pathname to native format. On win32, this involves forcing all 4450 // separators to be '\\' rather than '/' (both are legal inputs, but Win95 4451 // sometimes rejects '/') and removing redundant separators. The input path is 4452 // assumed to have been converted into the character encoding used by the local 4453 // system. Because this might be a double-byte encoding, care is taken to 4454 // treat double-byte lead characters correctly. 4455 // 4456 // This procedure modifies the given path in place, as the result is never 4457 // longer than the original. There is no error return; this operation always 4458 // succeeds. 4459 char * os::native_path(char *path) { 4460 char *src = path, *dst = path, *end = path; 4461 char *colon = NULL; // If a drive specifier is found, this will 4462 // point to the colon following the drive letter 4463 4464 // Assumption: '/', '\\', ':', and drive letters are never lead bytes 4465 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\')) 4466 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte"); 4467 4468 // Check for leading separators 4469 #define isfilesep(c) ((c) == '/' || (c) == '\\') 4470 while (isfilesep(*src)) { 4471 src++; 4472 } 4473 4474 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 4475 // Remove leading separators if followed by drive specifier. This 4476 // hack is necessary to support file URLs containing drive 4477 // specifiers (e.g., "file://c:/path"). As a side effect, 4478 // "/c:/path" can be used as an alternative to "c:/path". 4479 *dst++ = *src++; 4480 colon = dst; 4481 *dst++ = ':'; 4482 src++; 4483 } else { 4484 src = path; 4485 if (isfilesep(src[0]) && isfilesep(src[1])) { 4486 // UNC pathname: Retain first separator; leave src pointed at 4487 // second separator so that further separators will be collapsed 4488 // into the second separator. The result will be a pathname 4489 // beginning with "\\\\" followed (most likely) by a host name. 4490 src = dst = path + 1; 4491 path[0] = '\\'; // Force first separator to '\\' 4492 } 4493 } 4494 4495 end = dst; 4496 4497 // Remove redundant separators from remainder of path, forcing all 4498 // separators to be '\\' rather than '/'. Also, single byte space 4499 // characters are removed from the end of the path because those 4500 // are not legal ending characters on this operating system. 4501 // 4502 while (*src != '\0') { 4503 if (isfilesep(*src)) { 4504 *dst++ = '\\'; src++; 4505 while (isfilesep(*src)) src++; 4506 if (*src == '\0') { 4507 // Check for trailing separator 4508 end = dst; 4509 if (colon == dst - 2) break; // "z:\\" 4510 if (dst == path + 1) break; // "\\" 4511 if (dst == path + 2 && isfilesep(path[0])) { 4512 // "\\\\" is not collapsed to "\\" because "\\\\" marks the 4513 // beginning of a UNC pathname. Even though it is not, by 4514 // itself, a valid UNC pathname, we leave it as is in order 4515 // to be consistent with the path canonicalizer as well 4516 // as the win32 APIs, which treat this case as an invalid 4517 // UNC pathname rather than as an alias for the root 4518 // directory of the current drive. 4519 break; 4520 } 4521 end = --dst; // Path does not denote a root directory, so 4522 // remove trailing separator 4523 break; 4524 } 4525 end = dst; 4526 } else { 4527 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character 4528 *dst++ = *src++; 4529 if (*src) *dst++ = *src++; 4530 end = dst; 4531 } else { // Copy a single-byte character 4532 char c = *src++; 4533 *dst++ = c; 4534 // Space is not a legal ending character 4535 if (c != ' ') end = dst; 4536 } 4537 } 4538 } 4539 4540 *end = '\0'; 4541 4542 // For "z:", add "." to work around a bug in the C runtime library 4543 if (colon == dst - 1) { 4544 path[2] = '.'; 4545 path[3] = '\0'; 4546 } 4547 4548 return path; 4549 } 4550 4551 // This code is a copy of JDK's sysSetLength 4552 // from src/windows/hpi/src/sys_api_md.c 4553 4554 int os::ftruncate(int fd, jlong length) { 4555 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4556 long high = (long)(length >> 32); 4557 DWORD ret; 4558 4559 if (h == (HANDLE)(-1)) { 4560 return -1; 4561 } 4562 4563 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 4564 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 4565 return -1; 4566 } 4567 4568 if (::SetEndOfFile(h) == FALSE) { 4569 return -1; 4570 } 4571 4572 return 0; 4573 } 4574 4575 4576 // This code is a copy of JDK's sysSync 4577 // from src/windows/hpi/src/sys_api_md.c 4578 // except for the legacy workaround for a bug in Win 98 4579 4580 int os::fsync(int fd) { 4581 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 4582 4583 if ((!::FlushFileBuffers(handle)) && 4584 (GetLastError() != ERROR_ACCESS_DENIED)) { 4585 // from winerror.h 4586 return -1; 4587 } 4588 return 0; 4589 } 4590 4591 static int nonSeekAvailable(int, long *); 4592 static int stdinAvailable(int, long *); 4593 4594 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR) 4595 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO) 4596 4597 // This code is a copy of JDK's sysAvailable 4598 // from src/windows/hpi/src/sys_api_md.c 4599 4600 int os::available(int fd, jlong *bytes) { 4601 jlong cur, end; 4602 struct _stati64 stbuf64; 4603 4604 if (::_fstati64(fd, &stbuf64) >= 0) { 4605 int mode = stbuf64.st_mode; 4606 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 4607 int ret; 4608 long lpbytes; 4609 if (fd == 0) { 4610 ret = stdinAvailable(fd, &lpbytes); 4611 } else { 4612 ret = nonSeekAvailable(fd, &lpbytes); 4613 } 4614 (*bytes) = (jlong)(lpbytes); 4615 return ret; 4616 } 4617 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 4618 return FALSE; 4619 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 4620 return FALSE; 4621 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 4622 return FALSE; 4623 } 4624 *bytes = end - cur; 4625 return TRUE; 4626 } else { 4627 return FALSE; 4628 } 4629 } 4630 4631 // This code is a copy of JDK's nonSeekAvailable 4632 // from src/windows/hpi/src/sys_api_md.c 4633 4634 static int nonSeekAvailable(int fd, long *pbytes) { 4635 // This is used for available on non-seekable devices 4636 // (like both named and anonymous pipes, such as pipes 4637 // connected to an exec'd process). 4638 // Standard Input is a special case. 4639 HANDLE han; 4640 4641 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 4642 return FALSE; 4643 } 4644 4645 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 4646 // PeekNamedPipe fails when at EOF. In that case we 4647 // simply make *pbytes = 0 which is consistent with the 4648 // behavior we get on Solaris when an fd is at EOF. 4649 // The only alternative is to raise an Exception, 4650 // which isn't really warranted. 4651 // 4652 if (::GetLastError() != ERROR_BROKEN_PIPE) { 4653 return FALSE; 4654 } 4655 *pbytes = 0; 4656 } 4657 return TRUE; 4658 } 4659 4660 #define MAX_INPUT_EVENTS 2000 4661 4662 // This code is a copy of JDK's stdinAvailable 4663 // from src/windows/hpi/src/sys_api_md.c 4664 4665 static int stdinAvailable(int fd, long *pbytes) { 4666 HANDLE han; 4667 DWORD numEventsRead = 0; // Number of events read from buffer 4668 DWORD numEvents = 0; // Number of events in buffer 4669 DWORD i = 0; // Loop index 4670 DWORD curLength = 0; // Position marker 4671 DWORD actualLength = 0; // Number of bytes readable 4672 BOOL error = FALSE; // Error holder 4673 INPUT_RECORD *lpBuffer; // Pointer to records of input events 4674 4675 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4676 return FALSE; 4677 } 4678 4679 // Construct an array of input records in the console buffer 4680 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4681 if (error == 0) { 4682 return nonSeekAvailable(fd, pbytes); 4683 } 4684 4685 // lpBuffer must fit into 64K or else PeekConsoleInput fails 4686 if (numEvents > MAX_INPUT_EVENTS) { 4687 numEvents = MAX_INPUT_EVENTS; 4688 } 4689 4690 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal); 4691 if (lpBuffer == NULL) { 4692 return FALSE; 4693 } 4694 4695 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4696 if (error == 0) { 4697 os::free(lpBuffer); 4698 return FALSE; 4699 } 4700 4701 // Examine input records for the number of bytes available 4702 for (i=0; i<numEvents; i++) { 4703 if (lpBuffer[i].EventType == KEY_EVENT) { 4704 4705 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4706 &(lpBuffer[i].Event); 4707 if (keyRecord->bKeyDown == TRUE) { 4708 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4709 curLength++; 4710 if (*keyPressed == '\r') { 4711 actualLength = curLength; 4712 } 4713 } 4714 } 4715 } 4716 4717 if (lpBuffer != NULL) { 4718 os::free(lpBuffer); 4719 } 4720 4721 *pbytes = (long) actualLength; 4722 return TRUE; 4723 } 4724 4725 // Map a block of memory. 4726 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4727 char *addr, size_t bytes, bool read_only, 4728 bool allow_exec) { 4729 HANDLE hFile; 4730 char* base; 4731 4732 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4733 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4734 if (hFile == NULL) { 4735 if (PrintMiscellaneous && Verbose) { 4736 DWORD err = GetLastError(); 4737 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err); 4738 } 4739 return NULL; 4740 } 4741 4742 if (allow_exec) { 4743 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4744 // unless it comes from a PE image (which the shared archive is not.) 4745 // Even VirtualProtect refuses to give execute access to mapped memory 4746 // that was not previously executable. 4747 // 4748 // Instead, stick the executable region in anonymous memory. Yuck. 4749 // Penalty is that ~4 pages will not be shareable - in the future 4750 // we might consider DLLizing the shared archive with a proper PE 4751 // header so that mapping executable + sharing is possible. 4752 4753 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4754 PAGE_READWRITE); 4755 if (base == NULL) { 4756 if (PrintMiscellaneous && Verbose) { 4757 DWORD err = GetLastError(); 4758 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 4759 } 4760 CloseHandle(hFile); 4761 return NULL; 4762 } 4763 4764 DWORD bytes_read; 4765 OVERLAPPED overlapped; 4766 overlapped.Offset = (DWORD)file_offset; 4767 overlapped.OffsetHigh = 0; 4768 overlapped.hEvent = NULL; 4769 // ReadFile guarantees that if the return value is true, the requested 4770 // number of bytes were read before returning. 4771 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 4772 if (!res) { 4773 if (PrintMiscellaneous && Verbose) { 4774 DWORD err = GetLastError(); 4775 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 4776 } 4777 release_memory(base, bytes); 4778 CloseHandle(hFile); 4779 return NULL; 4780 } 4781 } else { 4782 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 4783 NULL /* file_name */); 4784 if (hMap == NULL) { 4785 if (PrintMiscellaneous && Verbose) { 4786 DWORD err = GetLastError(); 4787 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err); 4788 } 4789 CloseHandle(hFile); 4790 return NULL; 4791 } 4792 4793 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 4794 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 4795 (DWORD)bytes, addr); 4796 if (base == NULL) { 4797 if (PrintMiscellaneous && Verbose) { 4798 DWORD err = GetLastError(); 4799 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 4800 } 4801 CloseHandle(hMap); 4802 CloseHandle(hFile); 4803 return NULL; 4804 } 4805 4806 if (CloseHandle(hMap) == 0) { 4807 if (PrintMiscellaneous && Verbose) { 4808 DWORD err = GetLastError(); 4809 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 4810 } 4811 CloseHandle(hFile); 4812 return base; 4813 } 4814 } 4815 4816 if (allow_exec) { 4817 DWORD old_protect; 4818 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 4819 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 4820 4821 if (!res) { 4822 if (PrintMiscellaneous && Verbose) { 4823 DWORD err = GetLastError(); 4824 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 4825 } 4826 // Don't consider this a hard error, on IA32 even if the 4827 // VirtualProtect fails, we should still be able to execute 4828 CloseHandle(hFile); 4829 return base; 4830 } 4831 } 4832 4833 if (CloseHandle(hFile) == 0) { 4834 if (PrintMiscellaneous && Verbose) { 4835 DWORD err = GetLastError(); 4836 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 4837 } 4838 return base; 4839 } 4840 4841 return base; 4842 } 4843 4844 4845 // Remap a block of memory. 4846 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4847 char *addr, size_t bytes, bool read_only, 4848 bool allow_exec) { 4849 // This OS does not allow existing memory maps to be remapped so we 4850 // have to unmap the memory before we remap it. 4851 if (!os::unmap_memory(addr, bytes)) { 4852 return NULL; 4853 } 4854 4855 // There is a very small theoretical window between the unmap_memory() 4856 // call above and the map_memory() call below where a thread in native 4857 // code may be able to access an address that is no longer mapped. 4858 4859 return os::map_memory(fd, file_name, file_offset, addr, bytes, 4860 read_only, allow_exec); 4861 } 4862 4863 4864 // Unmap a block of memory. 4865 // Returns true=success, otherwise false. 4866 4867 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4868 MEMORY_BASIC_INFORMATION mem_info; 4869 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) { 4870 if (PrintMiscellaneous && Verbose) { 4871 DWORD err = GetLastError(); 4872 tty->print_cr("VirtualQuery() failed: GetLastError->%ld.", err); 4873 } 4874 return false; 4875 } 4876 4877 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx. 4878 // Instead, executable region was allocated using VirtualAlloc(). See 4879 // pd_map_memory() above. 4880 // 4881 // The following flags should match the 'exec_access' flages used for 4882 // VirtualProtect() in pd_map_memory(). 4883 if (mem_info.Protect == PAGE_EXECUTE_READ || 4884 mem_info.Protect == PAGE_EXECUTE_READWRITE) { 4885 return pd_release_memory(addr, bytes); 4886 } 4887 4888 BOOL result = UnmapViewOfFile(addr); 4889 if (result == 0) { 4890 if (PrintMiscellaneous && Verbose) { 4891 DWORD err = GetLastError(); 4892 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 4893 } 4894 return false; 4895 } 4896 return true; 4897 } 4898 4899 void os::pause() { 4900 char filename[MAX_PATH]; 4901 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4902 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4903 } else { 4904 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4905 } 4906 4907 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4908 if (fd != -1) { 4909 struct stat buf; 4910 ::close(fd); 4911 while (::stat(filename, &buf) == 0) { 4912 Sleep(100); 4913 } 4914 } else { 4915 jio_fprintf(stderr, 4916 "Could not open pause file '%s', continuing immediately.\n", filename); 4917 } 4918 } 4919 4920 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 4921 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 4922 } 4923 4924 // See the caveats for this class in os_windows.hpp 4925 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back 4926 // into this method and returns false. If no OS EXCEPTION was raised, returns 4927 // true. 4928 // The callback is supposed to provide the method that should be protected. 4929 // 4930 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 4931 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); 4932 assert(!WatcherThread::watcher_thread()->has_crash_protection(), 4933 "crash_protection already set?"); 4934 4935 bool success = true; 4936 __try { 4937 WatcherThread::watcher_thread()->set_crash_protection(this); 4938 cb.call(); 4939 } __except(EXCEPTION_EXECUTE_HANDLER) { 4940 // only for protection, nothing to do 4941 success = false; 4942 } 4943 WatcherThread::watcher_thread()->set_crash_protection(NULL); 4944 return success; 4945 } 4946 4947 // An Event wraps a win32 "CreateEvent" kernel handle. 4948 // 4949 // We have a number of choices regarding "CreateEvent" win32 handle leakage: 4950 // 4951 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 4952 // field, and call CloseHandle() on the win32 event handle. Unpark() would 4953 // need to be modified to tolerate finding a NULL (invalid) win32 event handle. 4954 // In addition, an unpark() operation might fetch the handle field, but the 4955 // event could recycle between the fetch and the SetEvent() operation. 4956 // SetEvent() would either fail because the handle was invalid, or inadvertently work, 4957 // as the win32 handle value had been recycled. In an ideal world calling SetEvent() 4958 // on an stale but recycled handle would be harmless, but in practice this might 4959 // confuse other non-Sun code, so it's not a viable approach. 4960 // 4961 // 2: Once a win32 event handle is associated with an Event, it remains associated 4962 // with the Event. The event handle is never closed. This could be construed 4963 // as handle leakage, but only up to the maximum # of threads that have been extant 4964 // at any one time. This shouldn't be an issue, as windows platforms typically 4965 // permit a process to have hundreds of thousands of open handles. 4966 // 4967 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 4968 // and release unused handles. 4969 // 4970 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 4971 // It's not clear, however, that we wouldn't be trading one type of leak for another. 4972 // 4973 // 5. Use an RCU-like mechanism (Read-Copy Update). 4974 // Or perhaps something similar to Maged Michael's "Hazard pointers". 4975 // 4976 // We use (2). 4977 // 4978 // TODO-FIXME: 4979 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 4980 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 4981 // to recover from (or at least detect) the dreaded Windows 841176 bug. 4982 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 4983 // into a single win32 CreateEvent() handle. 4984 // 4985 // Assumption: 4986 // Only one parker can exist on an event, which is why we allocate 4987 // them per-thread. Multiple unparkers can coexist. 4988 // 4989 // _Event transitions in park() 4990 // -1 => -1 : illegal 4991 // 1 => 0 : pass - return immediately 4992 // 0 => -1 : block; then set _Event to 0 before returning 4993 // 4994 // _Event transitions in unpark() 4995 // 0 => 1 : just return 4996 // 1 => 1 : just return 4997 // -1 => either 0 or 1; must signal target thread 4998 // That is, we can safely transition _Event from -1 to either 4999 // 0 or 1. 5000 // 5001 // _Event serves as a restricted-range semaphore. 5002 // -1 : thread is blocked, i.e. there is a waiter 5003 // 0 : neutral: thread is running or ready, 5004 // could have been signaled after a wait started 5005 // 1 : signaled - thread is running or ready 5006 // 5007 // Another possible encoding of _Event would be with 5008 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5009 // 5010 5011 int os::PlatformEvent::park(jlong Millis) { 5012 // Transitions for _Event: 5013 // -1 => -1 : illegal 5014 // 1 => 0 : pass - return immediately 5015 // 0 => -1 : block; then set _Event to 0 before returning 5016 5017 guarantee(_ParkHandle != NULL , "Invariant"); 5018 guarantee(Millis > 0 , "Invariant"); 5019 5020 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 5021 // the initial park() operation. 5022 // Consider: use atomic decrement instead of CAS-loop 5023 5024 int v; 5025 for (;;) { 5026 v = _Event; 5027 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5028 } 5029 guarantee((v == 0) || (v == 1), "invariant"); 5030 if (v != 0) return OS_OK; 5031 5032 // Do this the hard way by blocking ... 5033 // TODO: consider a brief spin here, gated on the success of recent 5034 // spin attempts by this thread. 5035 // 5036 // We decompose long timeouts into series of shorter timed waits. 5037 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 5038 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 5039 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 5040 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 5041 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 5042 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 5043 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 5044 // for the already waited time. This policy does not admit any new outcomes. 5045 // In the future, however, we might want to track the accumulated wait time and 5046 // adjust Millis accordingly if we encounter a spurious wakeup. 5047 5048 const int MAXTIMEOUT = 0x10000000; 5049 DWORD rv = WAIT_TIMEOUT; 5050 while (_Event < 0 && Millis > 0) { 5051 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT) 5052 if (Millis > MAXTIMEOUT) { 5053 prd = MAXTIMEOUT; 5054 } 5055 rv = ::WaitForSingleObject(_ParkHandle, prd); 5056 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed"); 5057 if (rv == WAIT_TIMEOUT) { 5058 Millis -= prd; 5059 } 5060 } 5061 v = _Event; 5062 _Event = 0; 5063 // see comment at end of os::PlatformEvent::park() below: 5064 OrderAccess::fence(); 5065 // If we encounter a nearly simultanous timeout expiry and unpark() 5066 // we return OS_OK indicating we awoke via unpark(). 5067 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 5068 return (v >= 0) ? OS_OK : OS_TIMEOUT; 5069 } 5070 5071 void os::PlatformEvent::park() { 5072 // Transitions for _Event: 5073 // -1 => -1 : illegal 5074 // 1 => 0 : pass - return immediately 5075 // 0 => -1 : block; then set _Event to 0 before returning 5076 5077 guarantee(_ParkHandle != NULL, "Invariant"); 5078 // Invariant: Only the thread associated with the Event/PlatformEvent 5079 // may call park(). 5080 // Consider: use atomic decrement instead of CAS-loop 5081 int v; 5082 for (;;) { 5083 v = _Event; 5084 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5085 } 5086 guarantee((v == 0) || (v == 1), "invariant"); 5087 if (v != 0) return; 5088 5089 // Do this the hard way by blocking ... 5090 // TODO: consider a brief spin here, gated on the success of recent 5091 // spin attempts by this thread. 5092 while (_Event < 0) { 5093 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE); 5094 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed"); 5095 } 5096 5097 // Usually we'll find _Event == 0 at this point, but as 5098 // an optional optimization we clear it, just in case can 5099 // multiple unpark() operations drove _Event up to 1. 5100 _Event = 0; 5101 OrderAccess::fence(); 5102 guarantee(_Event >= 0, "invariant"); 5103 } 5104 5105 void os::PlatformEvent::unpark() { 5106 guarantee(_ParkHandle != NULL, "Invariant"); 5107 5108 // Transitions for _Event: 5109 // 0 => 1 : just return 5110 // 1 => 1 : just return 5111 // -1 => either 0 or 1; must signal target thread 5112 // That is, we can safely transition _Event from -1 to either 5113 // 0 or 1. 5114 // See also: "Semaphores in Plan 9" by Mullender & Cox 5115 // 5116 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5117 // that it will take two back-to-back park() calls for the owning 5118 // thread to block. This has the benefit of forcing a spurious return 5119 // from the first park() call after an unpark() call which will help 5120 // shake out uses of park() and unpark() without condition variables. 5121 5122 if (Atomic::xchg(1, &_Event) >= 0) return; 5123 5124 ::SetEvent(_ParkHandle); 5125 } 5126 5127 5128 // JSR166 5129 // ------------------------------------------------------- 5130 5131 // The Windows implementation of Park is very straightforward: Basic 5132 // operations on Win32 Events turn out to have the right semantics to 5133 // use them directly. We opportunistically resuse the event inherited 5134 // from Monitor. 5135 5136 void Parker::park(bool isAbsolute, jlong time) { 5137 guarantee(_ParkEvent != NULL, "invariant"); 5138 // First, demultiplex/decode time arguments 5139 if (time < 0) { // don't wait 5140 return; 5141 } else if (time == 0 && !isAbsolute) { 5142 time = INFINITE; 5143 } else if (isAbsolute) { 5144 time -= os::javaTimeMillis(); // convert to relative time 5145 if (time <= 0) { // already elapsed 5146 return; 5147 } 5148 } else { // relative 5149 time /= 1000000; // Must coarsen from nanos to millis 5150 if (time == 0) { // Wait for the minimal time unit if zero 5151 time = 1; 5152 } 5153 } 5154 5155 JavaThread* thread = (JavaThread*)(Thread::current()); 5156 assert(thread->is_Java_thread(), "Must be JavaThread"); 5157 JavaThread *jt = (JavaThread *)thread; 5158 5159 // Don't wait if interrupted or already triggered 5160 if (Thread::is_interrupted(thread, false) || 5161 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 5162 ResetEvent(_ParkEvent); 5163 return; 5164 } else { 5165 ThreadBlockInVM tbivm(jt); 5166 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5167 jt->set_suspend_equivalent(); 5168 5169 WaitForSingleObject(_ParkEvent, time); 5170 ResetEvent(_ParkEvent); 5171 5172 // If externally suspended while waiting, re-suspend 5173 if (jt->handle_special_suspend_equivalent_condition()) { 5174 jt->java_suspend_self(); 5175 } 5176 } 5177 } 5178 5179 void Parker::unpark() { 5180 guarantee(_ParkEvent != NULL, "invariant"); 5181 SetEvent(_ParkEvent); 5182 } 5183 5184 // Run the specified command in a separate process. Return its exit value, 5185 // or -1 on failure (e.g. can't create a new process). 5186 int os::fork_and_exec(char* cmd) { 5187 STARTUPINFO si; 5188 PROCESS_INFORMATION pi; 5189 5190 memset(&si, 0, sizeof(si)); 5191 si.cb = sizeof(si); 5192 memset(&pi, 0, sizeof(pi)); 5193 BOOL rslt = CreateProcess(NULL, // executable name - use command line 5194 cmd, // command line 5195 NULL, // process security attribute 5196 NULL, // thread security attribute 5197 TRUE, // inherits system handles 5198 0, // no creation flags 5199 NULL, // use parent's environment block 5200 NULL, // use parent's starting directory 5201 &si, // (in) startup information 5202 &pi); // (out) process information 5203 5204 if (rslt) { 5205 // Wait until child process exits. 5206 WaitForSingleObject(pi.hProcess, INFINITE); 5207 5208 DWORD exit_code; 5209 GetExitCodeProcess(pi.hProcess, &exit_code); 5210 5211 // Close process and thread handles. 5212 CloseHandle(pi.hProcess); 5213 CloseHandle(pi.hThread); 5214 5215 return (int)exit_code; 5216 } else { 5217 return -1; 5218 } 5219 } 5220 5221 //-------------------------------------------------------------------------------------------------- 5222 // Non-product code 5223 5224 static int mallocDebugIntervalCounter = 0; 5225 static int mallocDebugCounter = 0; 5226 bool os::check_heap(bool force) { 5227 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 5228 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 5229 // Note: HeapValidate executes two hardware breakpoints when it finds something 5230 // wrong; at these points, eax contains the address of the offending block (I think). 5231 // To get to the exlicit error message(s) below, just continue twice. 5232 HANDLE heap = GetProcessHeap(); 5233 5234 // If we fail to lock the heap, then gflags.exe has been used 5235 // or some other special heap flag has been set that prevents 5236 // locking. We don't try to walk a heap we can't lock. 5237 if (HeapLock(heap) != 0) { 5238 PROCESS_HEAP_ENTRY phe; 5239 phe.lpData = NULL; 5240 while (HeapWalk(heap, &phe) != 0) { 5241 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 5242 !HeapValidate(heap, 0, phe.lpData)) { 5243 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 5244 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 5245 fatal("corrupted C heap"); 5246 } 5247 } 5248 DWORD err = GetLastError(); 5249 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 5250 fatal("heap walk aborted with error %d", err); 5251 } 5252 HeapUnlock(heap); 5253 } 5254 mallocDebugIntervalCounter = 0; 5255 } 5256 return true; 5257 } 5258 5259 5260 bool os::find(address addr, outputStream* st) { 5261 // Nothing yet 5262 return false; 5263 } 5264 5265 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 5266 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 5267 5268 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 5269 JavaThread* thread = JavaThread::current(); 5270 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 5271 address addr = (address) exceptionRecord->ExceptionInformation[1]; 5272 5273 if (os::is_memory_serialize_page(thread, addr)) { 5274 return EXCEPTION_CONTINUE_EXECUTION; 5275 } 5276 } 5277 5278 return EXCEPTION_CONTINUE_SEARCH; 5279 } 5280 5281 // We don't build a headless jre for Windows 5282 bool os::is_headless_jre() { return false; } 5283 5284 static jint initSock() { 5285 WSADATA wsadata; 5286 5287 if (!os::WinSock2Dll::WinSock2Available()) { 5288 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n", 5289 ::GetLastError()); 5290 return JNI_ERR; 5291 } 5292 5293 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) { 5294 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n", 5295 ::GetLastError()); 5296 return JNI_ERR; 5297 } 5298 return JNI_OK; 5299 } 5300 5301 struct hostent* os::get_host_by_name(char* name) { 5302 return (struct hostent*)os::WinSock2Dll::gethostbyname(name); 5303 } 5304 5305 int os::socket_close(int fd) { 5306 return ::closesocket(fd); 5307 } 5308 5309 int os::socket(int domain, int type, int protocol) { 5310 return ::socket(domain, type, protocol); 5311 } 5312 5313 int os::connect(int fd, struct sockaddr* him, socklen_t len) { 5314 return ::connect(fd, him, len); 5315 } 5316 5317 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5318 return ::recv(fd, buf, (int)nBytes, flags); 5319 } 5320 5321 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5322 return ::send(fd, buf, (int)nBytes, flags); 5323 } 5324 5325 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5326 return ::send(fd, buf, (int)nBytes, flags); 5327 } 5328 5329 // WINDOWS CONTEXT Flags for THREAD_SAMPLING 5330 #if defined(IA32) 5331 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS) 5332 #elif defined (AMD64) 5333 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT) 5334 #endif 5335 5336 // returns true if thread could be suspended, 5337 // false otherwise 5338 static bool do_suspend(HANDLE* h) { 5339 if (h != NULL) { 5340 if (SuspendThread(*h) != ~0) { 5341 return true; 5342 } 5343 } 5344 return false; 5345 } 5346 5347 // resume the thread 5348 // calling resume on an active thread is a no-op 5349 static void do_resume(HANDLE* h) { 5350 if (h != NULL) { 5351 ResumeThread(*h); 5352 } 5353 } 5354 5355 // retrieve a suspend/resume context capable handle 5356 // from the tid. Caller validates handle return value. 5357 void get_thread_handle_for_extended_context(HANDLE* h, 5358 OSThread::thread_id_t tid) { 5359 if (h != NULL) { 5360 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid); 5361 } 5362 } 5363 5364 // Thread sampling implementation 5365 // 5366 void os::SuspendedThreadTask::internal_do_task() { 5367 CONTEXT ctxt; 5368 HANDLE h = NULL; 5369 5370 // get context capable handle for thread 5371 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id()); 5372 5373 // sanity 5374 if (h == NULL || h == INVALID_HANDLE_VALUE) { 5375 return; 5376 } 5377 5378 // suspend the thread 5379 if (do_suspend(&h)) { 5380 ctxt.ContextFlags = sampling_context_flags; 5381 // get thread context 5382 GetThreadContext(h, &ctxt); 5383 SuspendedThreadTaskContext context(_thread, &ctxt); 5384 // pass context to Thread Sampling impl 5385 do_task(context); 5386 // resume thread 5387 do_resume(&h); 5388 } 5389 5390 // close handle 5391 CloseHandle(h); 5392 } 5393 5394 5395 // Kernel32 API 5396 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void); 5397 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD); 5398 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG); 5399 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG); 5400 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG); 5401 5402 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL; 5403 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL; 5404 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL; 5405 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL; 5406 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL; 5407 5408 5409 BOOL os::Kernel32Dll::initialized = FALSE; 5410 SIZE_T os::Kernel32Dll::GetLargePageMinimum() { 5411 assert(initialized && _GetLargePageMinimum != NULL, 5412 "GetLargePageMinimumAvailable() not yet called"); 5413 return _GetLargePageMinimum(); 5414 } 5415 5416 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() { 5417 if (!initialized) { 5418 initialize(); 5419 } 5420 return _GetLargePageMinimum != NULL; 5421 } 5422 5423 BOOL os::Kernel32Dll::NumaCallsAvailable() { 5424 if (!initialized) { 5425 initialize(); 5426 } 5427 return _VirtualAllocExNuma != NULL; 5428 } 5429 5430 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, 5431 SIZE_T bytes, DWORD flags, 5432 DWORD prot, DWORD node) { 5433 assert(initialized && _VirtualAllocExNuma != NULL, 5434 "NUMACallsAvailable() not yet called"); 5435 5436 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node); 5437 } 5438 5439 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) { 5440 assert(initialized && _GetNumaHighestNodeNumber != NULL, 5441 "NUMACallsAvailable() not yet called"); 5442 5443 return _GetNumaHighestNodeNumber(ptr_highest_node_number); 5444 } 5445 5446 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, 5447 PULONGLONG proc_mask) { 5448 assert(initialized && _GetNumaNodeProcessorMask != NULL, 5449 "NUMACallsAvailable() not yet called"); 5450 5451 return _GetNumaNodeProcessorMask(node, proc_mask); 5452 } 5453 5454 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip, 5455 ULONG FrameToCapture, 5456 PVOID* BackTrace, 5457 PULONG BackTraceHash) { 5458 if (!initialized) { 5459 initialize(); 5460 } 5461 5462 if (_RtlCaptureStackBackTrace != NULL) { 5463 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture, 5464 BackTrace, BackTraceHash); 5465 } else { 5466 return 0; 5467 } 5468 } 5469 5470 void os::Kernel32Dll::initializeCommon() { 5471 if (!initialized) { 5472 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5473 assert(handle != NULL, "Just check"); 5474 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum"); 5475 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma"); 5476 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber"); 5477 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask"); 5478 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace"); 5479 initialized = TRUE; 5480 } 5481 } 5482 5483 5484 5485 #ifndef JDK6_OR_EARLIER 5486 5487 void os::Kernel32Dll::initialize() { 5488 initializeCommon(); 5489 } 5490 5491 5492 // Kernel32 API 5493 inline BOOL os::Kernel32Dll::SwitchToThread() { 5494 return ::SwitchToThread(); 5495 } 5496 5497 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5498 return true; 5499 } 5500 5501 // Help tools 5502 inline BOOL os::Kernel32Dll::HelpToolsAvailable() { 5503 return true; 5504 } 5505 5506 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5507 DWORD th32ProcessId) { 5508 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5509 } 5510 5511 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot, 5512 LPMODULEENTRY32 lpme) { 5513 return ::Module32First(hSnapshot, lpme); 5514 } 5515 5516 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5517 LPMODULEENTRY32 lpme) { 5518 return ::Module32Next(hSnapshot, lpme); 5519 } 5520 5521 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5522 ::GetNativeSystemInfo(lpSystemInfo); 5523 } 5524 5525 // PSAPI API 5526 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, 5527 HMODULE *lpModule, DWORD cb, 5528 LPDWORD lpcbNeeded) { 5529 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5530 } 5531 5532 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, 5533 HMODULE hModule, 5534 LPTSTR lpFilename, 5535 DWORD nSize) { 5536 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5537 } 5538 5539 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, 5540 HMODULE hModule, 5541 LPMODULEINFO lpmodinfo, 5542 DWORD cb) { 5543 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5544 } 5545 5546 inline BOOL os::PSApiDll::PSApiAvailable() { 5547 return true; 5548 } 5549 5550 5551 // WinSock2 API 5552 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, 5553 LPWSADATA lpWSAData) { 5554 return ::WSAStartup(wVersionRequested, lpWSAData); 5555 } 5556 5557 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5558 return ::gethostbyname(name); 5559 } 5560 5561 inline BOOL os::WinSock2Dll::WinSock2Available() { 5562 return true; 5563 } 5564 5565 // Advapi API 5566 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5567 BOOL DisableAllPrivileges, 5568 PTOKEN_PRIVILEGES NewState, 5569 DWORD BufferLength, 5570 PTOKEN_PRIVILEGES PreviousState, 5571 PDWORD ReturnLength) { 5572 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5573 BufferLength, PreviousState, ReturnLength); 5574 } 5575 5576 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5577 DWORD DesiredAccess, 5578 PHANDLE TokenHandle) { 5579 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5580 } 5581 5582 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5583 LPCTSTR lpName, 5584 PLUID lpLuid) { 5585 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5586 } 5587 5588 inline BOOL os::Advapi32Dll::AdvapiAvailable() { 5589 return true; 5590 } 5591 5592 void* os::get_default_process_handle() { 5593 return (void*)GetModuleHandle(NULL); 5594 } 5595 5596 // Builds a platform dependent Agent_OnLoad_<lib_name> function name 5597 // which is used to find statically linked in agents. 5598 // Additionally for windows, takes into account __stdcall names. 5599 // Parameters: 5600 // sym_name: Symbol in library we are looking for 5601 // lib_name: Name of library to look in, NULL for shared libs. 5602 // is_absolute_path == true if lib_name is absolute path to agent 5603 // such as "C:/a/b/L.dll" 5604 // == false if only the base name of the library is passed in 5605 // such as "L" 5606 char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 5607 bool is_absolute_path) { 5608 char *agent_entry_name; 5609 size_t len; 5610 size_t name_len; 5611 size_t prefix_len = strlen(JNI_LIB_PREFIX); 5612 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 5613 const char *start; 5614 5615 if (lib_name != NULL) { 5616 len = name_len = strlen(lib_name); 5617 if (is_absolute_path) { 5618 // Need to strip path, prefix and suffix 5619 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 5620 lib_name = ++start; 5621 } else { 5622 // Need to check for drive prefix 5623 if ((start = strchr(lib_name, ':')) != NULL) { 5624 lib_name = ++start; 5625 } 5626 } 5627 if (len <= (prefix_len + suffix_len)) { 5628 return NULL; 5629 } 5630 lib_name += prefix_len; 5631 name_len = strlen(lib_name) - suffix_len; 5632 } 5633 } 5634 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 5635 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 5636 if (agent_entry_name == NULL) { 5637 return NULL; 5638 } 5639 if (lib_name != NULL) { 5640 const char *p = strrchr(sym_name, '@'); 5641 if (p != NULL && p != sym_name) { 5642 // sym_name == _Agent_OnLoad@XX 5643 strncpy(agent_entry_name, sym_name, (p - sym_name)); 5644 agent_entry_name[(p-sym_name)] = '\0'; 5645 // agent_entry_name == _Agent_OnLoad 5646 strcat(agent_entry_name, "_"); 5647 strncat(agent_entry_name, lib_name, name_len); 5648 strcat(agent_entry_name, p); 5649 // agent_entry_name == _Agent_OnLoad_lib_name@XX 5650 } else { 5651 strcpy(agent_entry_name, sym_name); 5652 strcat(agent_entry_name, "_"); 5653 strncat(agent_entry_name, lib_name, name_len); 5654 } 5655 } else { 5656 strcpy(agent_entry_name, sym_name); 5657 } 5658 return agent_entry_name; 5659 } 5660 5661 #else 5662 // Kernel32 API 5663 typedef BOOL (WINAPI* SwitchToThread_Fn)(void); 5664 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD); 5665 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32); 5666 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32); 5667 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO); 5668 5669 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL; 5670 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL; 5671 Module32First_Fn os::Kernel32Dll::_Module32First = NULL; 5672 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL; 5673 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL; 5674 5675 void os::Kernel32Dll::initialize() { 5676 if (!initialized) { 5677 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5678 assert(handle != NULL, "Just check"); 5679 5680 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread"); 5681 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn) 5682 ::GetProcAddress(handle, "CreateToolhelp32Snapshot"); 5683 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First"); 5684 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next"); 5685 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo"); 5686 initializeCommon(); // resolve the functions that always need resolving 5687 5688 initialized = TRUE; 5689 } 5690 } 5691 5692 BOOL os::Kernel32Dll::SwitchToThread() { 5693 assert(initialized && _SwitchToThread != NULL, 5694 "SwitchToThreadAvailable() not yet called"); 5695 return _SwitchToThread(); 5696 } 5697 5698 5699 BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5700 if (!initialized) { 5701 initialize(); 5702 } 5703 return _SwitchToThread != NULL; 5704 } 5705 5706 // Help tools 5707 BOOL os::Kernel32Dll::HelpToolsAvailable() { 5708 if (!initialized) { 5709 initialize(); 5710 } 5711 return _CreateToolhelp32Snapshot != NULL && 5712 _Module32First != NULL && 5713 _Module32Next != NULL; 5714 } 5715 5716 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5717 DWORD th32ProcessId) { 5718 assert(initialized && _CreateToolhelp32Snapshot != NULL, 5719 "HelpToolsAvailable() not yet called"); 5720 5721 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5722 } 5723 5724 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5725 assert(initialized && _Module32First != NULL, 5726 "HelpToolsAvailable() not yet called"); 5727 5728 return _Module32First(hSnapshot, lpme); 5729 } 5730 5731 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5732 LPMODULEENTRY32 lpme) { 5733 assert(initialized && _Module32Next != NULL, 5734 "HelpToolsAvailable() not yet called"); 5735 5736 return _Module32Next(hSnapshot, lpme); 5737 } 5738 5739 5740 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() { 5741 if (!initialized) { 5742 initialize(); 5743 } 5744 return _GetNativeSystemInfo != NULL; 5745 } 5746 5747 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5748 assert(initialized && _GetNativeSystemInfo != NULL, 5749 "GetNativeSystemInfoAvailable() not yet called"); 5750 5751 _GetNativeSystemInfo(lpSystemInfo); 5752 } 5753 5754 // PSAPI API 5755 5756 5757 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD); 5758 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD); 5759 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD); 5760 5761 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL; 5762 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL; 5763 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL; 5764 BOOL os::PSApiDll::initialized = FALSE; 5765 5766 void os::PSApiDll::initialize() { 5767 if (!initialized) { 5768 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0); 5769 if (handle != NULL) { 5770 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle, 5771 "EnumProcessModules"); 5772 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle, 5773 "GetModuleFileNameExA"); 5774 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle, 5775 "GetModuleInformation"); 5776 } 5777 initialized = TRUE; 5778 } 5779 } 5780 5781 5782 5783 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, 5784 DWORD cb, LPDWORD lpcbNeeded) { 5785 assert(initialized && _EnumProcessModules != NULL, 5786 "PSApiAvailable() not yet called"); 5787 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5788 } 5789 5790 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, 5791 LPTSTR lpFilename, DWORD nSize) { 5792 assert(initialized && _GetModuleFileNameEx != NULL, 5793 "PSApiAvailable() not yet called"); 5794 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5795 } 5796 5797 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, 5798 LPMODULEINFO lpmodinfo, DWORD cb) { 5799 assert(initialized && _GetModuleInformation != NULL, 5800 "PSApiAvailable() not yet called"); 5801 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5802 } 5803 5804 BOOL os::PSApiDll::PSApiAvailable() { 5805 if (!initialized) { 5806 initialize(); 5807 } 5808 return _EnumProcessModules != NULL && 5809 _GetModuleFileNameEx != NULL && 5810 _GetModuleInformation != NULL; 5811 } 5812 5813 5814 // WinSock2 API 5815 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA); 5816 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...); 5817 5818 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL; 5819 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL; 5820 BOOL os::WinSock2Dll::initialized = FALSE; 5821 5822 void os::WinSock2Dll::initialize() { 5823 if (!initialized) { 5824 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0); 5825 if (handle != NULL) { 5826 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup"); 5827 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname"); 5828 } 5829 initialized = TRUE; 5830 } 5831 } 5832 5833 5834 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) { 5835 assert(initialized && _WSAStartup != NULL, 5836 "WinSock2Available() not yet called"); 5837 return _WSAStartup(wVersionRequested, lpWSAData); 5838 } 5839 5840 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5841 assert(initialized && _gethostbyname != NULL, 5842 "WinSock2Available() not yet called"); 5843 return _gethostbyname(name); 5844 } 5845 5846 BOOL os::WinSock2Dll::WinSock2Available() { 5847 if (!initialized) { 5848 initialize(); 5849 } 5850 return _WSAStartup != NULL && 5851 _gethostbyname != NULL; 5852 } 5853 5854 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 5855 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE); 5856 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID); 5857 5858 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL; 5859 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL; 5860 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL; 5861 BOOL os::Advapi32Dll::initialized = FALSE; 5862 5863 void os::Advapi32Dll::initialize() { 5864 if (!initialized) { 5865 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0); 5866 if (handle != NULL) { 5867 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle, 5868 "AdjustTokenPrivileges"); 5869 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle, 5870 "OpenProcessToken"); 5871 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle, 5872 "LookupPrivilegeValueA"); 5873 } 5874 initialized = TRUE; 5875 } 5876 } 5877 5878 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5879 BOOL DisableAllPrivileges, 5880 PTOKEN_PRIVILEGES NewState, 5881 DWORD BufferLength, 5882 PTOKEN_PRIVILEGES PreviousState, 5883 PDWORD ReturnLength) { 5884 assert(initialized && _AdjustTokenPrivileges != NULL, 5885 "AdvapiAvailable() not yet called"); 5886 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5887 BufferLength, PreviousState, ReturnLength); 5888 } 5889 5890 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5891 DWORD DesiredAccess, 5892 PHANDLE TokenHandle) { 5893 assert(initialized && _OpenProcessToken != NULL, 5894 "AdvapiAvailable() not yet called"); 5895 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5896 } 5897 5898 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5899 LPCTSTR lpName, PLUID lpLuid) { 5900 assert(initialized && _LookupPrivilegeValue != NULL, 5901 "AdvapiAvailable() not yet called"); 5902 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5903 } 5904 5905 BOOL os::Advapi32Dll::AdvapiAvailable() { 5906 if (!initialized) { 5907 initialize(); 5908 } 5909 return _AdjustTokenPrivileges != NULL && 5910 _OpenProcessToken != NULL && 5911 _LookupPrivilegeValue != NULL; 5912 } 5913 5914 #endif 5915 5916 #ifndef PRODUCT 5917 5918 // test the code path in reserve_memory_special() that tries to allocate memory in a single 5919 // contiguous memory block at a particular address. 5920 // The test first tries to find a good approximate address to allocate at by using the same 5921 // method to allocate some memory at any address. The test then tries to allocate memory in 5922 // the vicinity (not directly after it to avoid possible by-chance use of that location) 5923 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of 5924 // the previously allocated memory is available for allocation. The only actual failure 5925 // that is reported is when the test tries to allocate at a particular location but gets a 5926 // different valid one. A NULL return value at this point is not considered an error but may 5927 // be legitimate. 5928 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages. 5929 void TestReserveMemorySpecial_test() { 5930 if (!UseLargePages) { 5931 if (VerboseInternalVMTests) { 5932 gclog_or_tty->print("Skipping test because large pages are disabled"); 5933 } 5934 return; 5935 } 5936 // save current value of globals 5937 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; 5938 bool old_use_numa_interleaving = UseNUMAInterleaving; 5939 5940 // set globals to make sure we hit the correct code path 5941 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; 5942 5943 // do an allocation at an address selected by the OS to get a good one. 5944 const size_t large_allocation_size = os::large_page_size() * 4; 5945 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); 5946 if (result == NULL) { 5947 if (VerboseInternalVMTests) { 5948 gclog_or_tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.", 5949 large_allocation_size); 5950 } 5951 } else { 5952 os::release_memory_special(result, large_allocation_size); 5953 5954 // allocate another page within the recently allocated memory area which seems to be a good location. At least 5955 // we managed to get it once. 5956 const size_t expected_allocation_size = os::large_page_size(); 5957 char* expected_location = result + os::large_page_size(); 5958 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); 5959 if (actual_location == NULL) { 5960 if (VerboseInternalVMTests) { 5961 gclog_or_tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.", 5962 expected_location, large_allocation_size); 5963 } 5964 } else { 5965 // release memory 5966 os::release_memory_special(actual_location, expected_allocation_size); 5967 // only now check, after releasing any memory to avoid any leaks. 5968 assert(actual_location == expected_location, 5969 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead", 5970 expected_location, expected_allocation_size, actual_location); 5971 } 5972 } 5973 5974 // restore globals 5975 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; 5976 UseNUMAInterleaving = old_use_numa_interleaving; 5977 } 5978 #endif // PRODUCT 5979 5980 // Fast current thread access 5981 5982 int os::win32::_thread_ptr_offset = 0; 5983 5984 static void call_wrapper_dummy() {} 5985 5986 // We need to call the os_exception_wrapper once so that it sets 5987 // up the offset from FS of the thread pointer. 5988 void os::win32::initialize_thread_ptr_offset() { 5989 os::os_exception_wrapper( (java_call_t)call_wrapper_dummy, 5990 NULL, NULL, NULL, NULL); 5991 }