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 int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) { 1614 int ret = vsnprintf(buf, len, fmt, args); 1615 // Get the correct buffer size if buf is too small 1616 if (ret < 0) { 1617 return _vscprintf(fmt, args); 1618 } 1619 return ret; 1620 } 1621 1622 void os::print_os_info_brief(outputStream* st) { 1623 os::print_os_info(st); 1624 } 1625 1626 void os::print_os_info(outputStream* st) { 1627 #ifdef ASSERT 1628 char buffer[1024]; 1629 st->print("HostName: "); 1630 if (get_host_name(buffer, sizeof(buffer))) { 1631 st->print("%s ", buffer); 1632 } else { 1633 st->print("N/A "); 1634 } 1635 #endif 1636 st->print("OS:"); 1637 os::win32::print_windows_version(st); 1638 } 1639 1640 void os::win32::print_windows_version(outputStream* st) { 1641 OSVERSIONINFOEX osvi; 1642 VS_FIXEDFILEINFO *file_info; 1643 TCHAR kernel32_path[MAX_PATH]; 1644 UINT len, ret; 1645 1646 // Use the GetVersionEx information to see if we're on a server or 1647 // workstation edition of Windows. Starting with Windows 8.1 we can't 1648 // trust the OS version information returned by this API. 1649 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1650 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1651 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1652 st->print_cr("Call to GetVersionEx failed"); 1653 return; 1654 } 1655 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION); 1656 1657 // Get the full path to \Windows\System32\kernel32.dll and use that for 1658 // determining what version of Windows we're running on. 1659 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1; 1660 ret = GetSystemDirectory(kernel32_path, len); 1661 if (ret == 0 || ret > len) { 1662 st->print_cr("Call to GetSystemDirectory failed"); 1663 return; 1664 } 1665 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret); 1666 1667 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL); 1668 if (version_size == 0) { 1669 st->print_cr("Call to GetFileVersionInfoSize failed"); 1670 return; 1671 } 1672 1673 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal); 1674 if (version_info == NULL) { 1675 st->print_cr("Failed to allocate version_info"); 1676 return; 1677 } 1678 1679 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) { 1680 os::free(version_info); 1681 st->print_cr("Call to GetFileVersionInfo failed"); 1682 return; 1683 } 1684 1685 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) { 1686 os::free(version_info); 1687 st->print_cr("Call to VerQueryValue failed"); 1688 return; 1689 } 1690 1691 int major_version = HIWORD(file_info->dwProductVersionMS); 1692 int minor_version = LOWORD(file_info->dwProductVersionMS); 1693 int build_number = HIWORD(file_info->dwProductVersionLS); 1694 int build_minor = LOWORD(file_info->dwProductVersionLS); 1695 int os_vers = major_version * 1000 + minor_version; 1696 os::free(version_info); 1697 1698 st->print(" Windows "); 1699 switch (os_vers) { 1700 1701 case 6000: 1702 if (is_workstation) { 1703 st->print("Vista"); 1704 } else { 1705 st->print("Server 2008"); 1706 } 1707 break; 1708 1709 case 6001: 1710 if (is_workstation) { 1711 st->print("7"); 1712 } else { 1713 st->print("Server 2008 R2"); 1714 } 1715 break; 1716 1717 case 6002: 1718 if (is_workstation) { 1719 st->print("8"); 1720 } else { 1721 st->print("Server 2012"); 1722 } 1723 break; 1724 1725 case 6003: 1726 if (is_workstation) { 1727 st->print("8.1"); 1728 } else { 1729 st->print("Server 2012 R2"); 1730 } 1731 break; 1732 1733 case 10000: 1734 if (is_workstation) { 1735 st->print("10"); 1736 } else { 1737 // The server version name of Windows 10 is not known at this time 1738 st->print("%d.%d", major_version, minor_version); 1739 } 1740 break; 1741 1742 default: 1743 // Unrecognized windows, print out its major and minor versions 1744 st->print("%d.%d", major_version, minor_version); 1745 break; 1746 } 1747 1748 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1749 // find out whether we are running on 64 bit processor or not 1750 SYSTEM_INFO si; 1751 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1752 os::Kernel32Dll::GetNativeSystemInfo(&si); 1753 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1754 st->print(" , 64 bit"); 1755 } 1756 1757 st->print(" Build %d", build_number); 1758 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor); 1759 st->cr(); 1760 } 1761 1762 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1763 // Nothing to do for now. 1764 } 1765 1766 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1767 HKEY key; 1768 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE, 1769 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key); 1770 if (status == ERROR_SUCCESS) { 1771 DWORD size = (DWORD)buflen; 1772 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size); 1773 if (status != ERROR_SUCCESS) { 1774 strncpy(buf, "## __CPU__", buflen); 1775 } 1776 RegCloseKey(key); 1777 } else { 1778 // Put generic cpu info to return 1779 strncpy(buf, "## __CPU__", buflen); 1780 } 1781 } 1782 1783 void os::print_memory_info(outputStream* st) { 1784 st->print("Memory:"); 1785 st->print(" %dk page", os::vm_page_size()>>10); 1786 1787 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1788 // value if total memory is larger than 4GB 1789 MEMORYSTATUSEX ms; 1790 ms.dwLength = sizeof(ms); 1791 GlobalMemoryStatusEx(&ms); 1792 1793 st->print(", physical %uk", os::physical_memory() >> 10); 1794 st->print("(%uk free)", os::available_memory() >> 10); 1795 1796 st->print(", swap %uk", ms.ullTotalPageFile >> 10); 1797 st->print("(%uk free)", ms.ullAvailPageFile >> 10); 1798 st->cr(); 1799 } 1800 1801 void os::print_siginfo(outputStream *st, void *siginfo) { 1802 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1803 st->print("siginfo:"); 1804 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1805 1806 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1807 er->NumberParameters >= 2) { 1808 switch (er->ExceptionInformation[0]) { 1809 case 0: st->print(", reading address"); break; 1810 case 1: st->print(", writing address"); break; 1811 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1812 er->ExceptionInformation[0]); 1813 } 1814 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1815 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1816 er->NumberParameters >= 2 && UseSharedSpaces) { 1817 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1818 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1819 st->print("\n\nError accessing class data sharing archive." \ 1820 " Mapped file inaccessible during execution, " \ 1821 " possible disk/network problem."); 1822 } 1823 } else { 1824 int num = er->NumberParameters; 1825 if (num > 0) { 1826 st->print(", ExceptionInformation="); 1827 for (int i = 0; i < num; i++) { 1828 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1829 } 1830 } 1831 } 1832 st->cr(); 1833 } 1834 1835 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1836 // do nothing 1837 } 1838 1839 static char saved_jvm_path[MAX_PATH] = {0}; 1840 1841 // Find the full path to the current module, jvm.dll 1842 void os::jvm_path(char *buf, jint buflen) { 1843 // Error checking. 1844 if (buflen < MAX_PATH) { 1845 assert(false, "must use a large-enough buffer"); 1846 buf[0] = '\0'; 1847 return; 1848 } 1849 // Lazy resolve the path to current module. 1850 if (saved_jvm_path[0] != 0) { 1851 strcpy(buf, saved_jvm_path); 1852 return; 1853 } 1854 1855 buf[0] = '\0'; 1856 if (Arguments::sun_java_launcher_is_altjvm()) { 1857 // Support for the java launcher's '-XXaltjvm=<path>' option. Check 1858 // for a JAVA_HOME environment variable and fix up the path so it 1859 // looks like jvm.dll is installed there (append a fake suffix 1860 // hotspot/jvm.dll). 1861 char* java_home_var = ::getenv("JAVA_HOME"); 1862 if (java_home_var != NULL && java_home_var[0] != 0 && 1863 strlen(java_home_var) < (size_t)buflen) { 1864 strncpy(buf, java_home_var, buflen); 1865 1866 // determine if this is a legacy image or modules image 1867 // modules image doesn't have "jre" subdirectory 1868 size_t len = strlen(buf); 1869 char* jrebin_p = buf + len; 1870 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1871 if (0 != _access(buf, 0)) { 1872 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1873 } 1874 len = strlen(buf); 1875 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1876 } 1877 } 1878 1879 if (buf[0] == '\0') { 1880 GetModuleFileName(vm_lib_handle, buf, buflen); 1881 } 1882 strncpy(saved_jvm_path, buf, MAX_PATH); 1883 saved_jvm_path[MAX_PATH - 1] = '\0'; 1884 } 1885 1886 1887 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1888 #ifndef _WIN64 1889 st->print("_"); 1890 #endif 1891 } 1892 1893 1894 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1895 #ifndef _WIN64 1896 st->print("@%d", args_size * sizeof(int)); 1897 #endif 1898 } 1899 1900 // This method is a copy of JDK's sysGetLastErrorString 1901 // from src/windows/hpi/src/system_md.c 1902 1903 size_t os::lasterror(char* buf, size_t len) { 1904 DWORD errval; 1905 1906 if ((errval = GetLastError()) != 0) { 1907 // DOS error 1908 size_t n = (size_t)FormatMessage( 1909 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1910 NULL, 1911 errval, 1912 0, 1913 buf, 1914 (DWORD)len, 1915 NULL); 1916 if (n > 3) { 1917 // Drop final '.', CR, LF 1918 if (buf[n - 1] == '\n') n--; 1919 if (buf[n - 1] == '\r') n--; 1920 if (buf[n - 1] == '.') n--; 1921 buf[n] = '\0'; 1922 } 1923 return n; 1924 } 1925 1926 if (errno != 0) { 1927 // C runtime error that has no corresponding DOS error code 1928 const char* s = strerror(errno); 1929 size_t n = strlen(s); 1930 if (n >= len) n = len - 1; 1931 strncpy(buf, s, n); 1932 buf[n] = '\0'; 1933 return n; 1934 } 1935 1936 return 0; 1937 } 1938 1939 int os::get_last_error() { 1940 DWORD error = GetLastError(); 1941 if (error == 0) { 1942 error = errno; 1943 } 1944 return (int)error; 1945 } 1946 1947 WindowsSemaphore::WindowsSemaphore(uint value) { 1948 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL); 1949 1950 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError()); 1951 } 1952 1953 WindowsSemaphore::~WindowsSemaphore() { 1954 ::CloseHandle(_semaphore); 1955 } 1956 1957 void WindowsSemaphore::signal(uint count) { 1958 if (count > 0) { 1959 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL); 1960 1961 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError()); 1962 } 1963 } 1964 1965 void WindowsSemaphore::wait() { 1966 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE); 1967 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError()); 1968 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret); 1969 } 1970 1971 // sun.misc.Signal 1972 // NOTE that this is a workaround for an apparent kernel bug where if 1973 // a signal handler for SIGBREAK is installed then that signal handler 1974 // takes priority over the console control handler for CTRL_CLOSE_EVENT. 1975 // See bug 4416763. 1976 static void (*sigbreakHandler)(int) = NULL; 1977 1978 static void UserHandler(int sig, void *siginfo, void *context) { 1979 os::signal_notify(sig); 1980 // We need to reinstate the signal handler each time... 1981 os::signal(sig, (void*)UserHandler); 1982 } 1983 1984 void* os::user_handler() { 1985 return (void*) UserHandler; 1986 } 1987 1988 void* os::signal(int signal_number, void* handler) { 1989 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1990 void (*oldHandler)(int) = sigbreakHandler; 1991 sigbreakHandler = (void (*)(int)) handler; 1992 return (void*) oldHandler; 1993 } else { 1994 return (void*)::signal(signal_number, (void (*)(int))handler); 1995 } 1996 } 1997 1998 void os::signal_raise(int signal_number) { 1999 raise(signal_number); 2000 } 2001 2002 // The Win32 C runtime library maps all console control events other than ^C 2003 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 2004 // logoff, and shutdown events. We therefore install our own console handler 2005 // that raises SIGTERM for the latter cases. 2006 // 2007 static BOOL WINAPI consoleHandler(DWORD event) { 2008 switch (event) { 2009 case CTRL_C_EVENT: 2010 if (is_error_reported()) { 2011 // Ctrl-C is pressed during error reporting, likely because the error 2012 // handler fails to abort. Let VM die immediately. 2013 os::die(); 2014 } 2015 2016 os::signal_raise(SIGINT); 2017 return TRUE; 2018 break; 2019 case CTRL_BREAK_EVENT: 2020 if (sigbreakHandler != NULL) { 2021 (*sigbreakHandler)(SIGBREAK); 2022 } 2023 return TRUE; 2024 break; 2025 case CTRL_LOGOFF_EVENT: { 2026 // Don't terminate JVM if it is running in a non-interactive session, 2027 // such as a service process. 2028 USEROBJECTFLAGS flags; 2029 HANDLE handle = GetProcessWindowStation(); 2030 if (handle != NULL && 2031 GetUserObjectInformation(handle, UOI_FLAGS, &flags, 2032 sizeof(USEROBJECTFLAGS), NULL)) { 2033 // If it is a non-interactive session, let next handler to deal 2034 // with it. 2035 if ((flags.dwFlags & WSF_VISIBLE) == 0) { 2036 return FALSE; 2037 } 2038 } 2039 } 2040 case CTRL_CLOSE_EVENT: 2041 case CTRL_SHUTDOWN_EVENT: 2042 os::signal_raise(SIGTERM); 2043 return TRUE; 2044 break; 2045 default: 2046 break; 2047 } 2048 return FALSE; 2049 } 2050 2051 // The following code is moved from os.cpp for making this 2052 // code platform specific, which it is by its very nature. 2053 2054 // Return maximum OS signal used + 1 for internal use only 2055 // Used as exit signal for signal_thread 2056 int os::sigexitnum_pd() { 2057 return NSIG; 2058 } 2059 2060 // a counter for each possible signal value, including signal_thread exit signal 2061 static volatile jint pending_signals[NSIG+1] = { 0 }; 2062 static HANDLE sig_sem = NULL; 2063 2064 void os::signal_init_pd() { 2065 // Initialize signal structures 2066 memset((void*)pending_signals, 0, sizeof(pending_signals)); 2067 2068 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 2069 2070 // Programs embedding the VM do not want it to attempt to receive 2071 // events like CTRL_LOGOFF_EVENT, which are used to implement the 2072 // shutdown hooks mechanism introduced in 1.3. For example, when 2073 // the VM is run as part of a Windows NT service (i.e., a servlet 2074 // engine in a web server), the correct behavior is for any console 2075 // control handler to return FALSE, not TRUE, because the OS's 2076 // "final" handler for such events allows the process to continue if 2077 // it is a service (while terminating it if it is not a service). 2078 // To make this behavior uniform and the mechanism simpler, we 2079 // completely disable the VM's usage of these console events if -Xrs 2080 // (=ReduceSignalUsage) is specified. This means, for example, that 2081 // the CTRL-BREAK thread dump mechanism is also disabled in this 2082 // case. See bugs 4323062, 4345157, and related bugs. 2083 2084 if (!ReduceSignalUsage) { 2085 // Add a CTRL-C handler 2086 SetConsoleCtrlHandler(consoleHandler, TRUE); 2087 } 2088 } 2089 2090 void os::signal_notify(int signal_number) { 2091 BOOL ret; 2092 if (sig_sem != NULL) { 2093 Atomic::inc(&pending_signals[signal_number]); 2094 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2095 assert(ret != 0, "ReleaseSemaphore() failed"); 2096 } 2097 } 2098 2099 static int check_pending_signals(bool wait_for_signal) { 2100 DWORD ret; 2101 while (true) { 2102 for (int i = 0; i < NSIG + 1; i++) { 2103 jint n = pending_signals[i]; 2104 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2105 return i; 2106 } 2107 } 2108 if (!wait_for_signal) { 2109 return -1; 2110 } 2111 2112 JavaThread *thread = JavaThread::current(); 2113 2114 ThreadBlockInVM tbivm(thread); 2115 2116 bool threadIsSuspended; 2117 do { 2118 thread->set_suspend_equivalent(); 2119 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2120 ret = ::WaitForSingleObject(sig_sem, INFINITE); 2121 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 2122 2123 // were we externally suspended while we were waiting? 2124 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2125 if (threadIsSuspended) { 2126 // The semaphore has been incremented, but while we were waiting 2127 // another thread suspended us. We don't want to continue running 2128 // while suspended because that would surprise the thread that 2129 // suspended us. 2130 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2131 assert(ret != 0, "ReleaseSemaphore() failed"); 2132 2133 thread->java_suspend_self(); 2134 } 2135 } while (threadIsSuspended); 2136 } 2137 } 2138 2139 int os::signal_lookup() { 2140 return check_pending_signals(false); 2141 } 2142 2143 int os::signal_wait() { 2144 return check_pending_signals(true); 2145 } 2146 2147 // Implicit OS exception handling 2148 2149 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, 2150 address handler) { 2151 JavaThread* thread = (JavaThread*) Thread::current_or_null(); 2152 // Save pc in thread 2153 #ifdef _M_IA64 2154 // Do not blow up if no thread info available. 2155 if (thread) { 2156 // Saving PRECISE pc (with slot information) in thread. 2157 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress; 2158 // Convert precise PC into "Unix" format 2159 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2); 2160 thread->set_saved_exception_pc((address)precise_pc); 2161 } 2162 // Set pc to handler 2163 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 2164 // Clear out psr.ri (= Restart Instruction) in order to continue 2165 // at the beginning of the target bundle. 2166 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF; 2167 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!"); 2168 #else 2169 #ifdef _M_AMD64 2170 // Do not blow up if no thread info available. 2171 if (thread) { 2172 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip); 2173 } 2174 // Set pc to handler 2175 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 2176 #else 2177 // Do not blow up if no thread info available. 2178 if (thread) { 2179 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip); 2180 } 2181 // Set pc to handler 2182 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler; 2183 #endif 2184 #endif 2185 2186 // Continue the execution 2187 return EXCEPTION_CONTINUE_EXECUTION; 2188 } 2189 2190 2191 // Used for PostMortemDump 2192 extern "C" void safepoints(); 2193 extern "C" void find(int x); 2194 extern "C" void events(); 2195 2196 // According to Windows API documentation, an illegal instruction sequence should generate 2197 // the 0xC000001C exception code. However, real world experience shows that occasionnaly 2198 // the execution of an illegal instruction can generate the exception code 0xC000001E. This 2199 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 2200 2201 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 2202 2203 // From "Execution Protection in the Windows Operating System" draft 0.35 2204 // Once a system header becomes available, the "real" define should be 2205 // included or copied here. 2206 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2207 2208 // Handle NAT Bit consumption on IA64. 2209 #ifdef _M_IA64 2210 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION 2211 #endif 2212 2213 // Windows Vista/2008 heap corruption check 2214 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374 2215 2216 #define def_excpt(val) #val, val 2217 2218 struct siglabel { 2219 char *name; 2220 int number; 2221 }; 2222 2223 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual 2224 // C++ compiler contain this error code. Because this is a compiler-generated 2225 // error, the code is not listed in the Win32 API header files. 2226 // The code is actually a cryptic mnemonic device, with the initial "E" 2227 // standing for "exception" and the final 3 bytes (0x6D7363) representing the 2228 // ASCII values of "msc". 2229 2230 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363 2231 2232 2233 struct siglabel exceptlabels[] = { 2234 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2235 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2236 def_excpt(EXCEPTION_BREAKPOINT), 2237 def_excpt(EXCEPTION_SINGLE_STEP), 2238 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2239 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2240 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2241 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2242 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2243 def_excpt(EXCEPTION_FLT_OVERFLOW), 2244 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2245 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2246 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2247 def_excpt(EXCEPTION_INT_OVERFLOW), 2248 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2249 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2250 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2251 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2252 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2253 def_excpt(EXCEPTION_STACK_OVERFLOW), 2254 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2255 def_excpt(EXCEPTION_GUARD_PAGE), 2256 def_excpt(EXCEPTION_INVALID_HANDLE), 2257 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION), 2258 def_excpt(EXCEPTION_HEAP_CORRUPTION), 2259 #ifdef _M_IA64 2260 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION), 2261 #endif 2262 NULL, 0 2263 }; 2264 2265 const char* os::exception_name(int exception_code, char *buf, size_t size) { 2266 for (int i = 0; exceptlabels[i].name != NULL; i++) { 2267 if (exceptlabels[i].number == exception_code) { 2268 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2269 return buf; 2270 } 2271 } 2272 2273 return NULL; 2274 } 2275 2276 //----------------------------------------------------------------------------- 2277 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2278 // handle exception caused by idiv; should only happen for -MinInt/-1 2279 // (division by zero is handled explicitly) 2280 #ifdef _M_IA64 2281 assert(0, "Fix Handle_IDiv_Exception"); 2282 #else 2283 #ifdef _M_AMD64 2284 PCONTEXT ctx = exceptionInfo->ContextRecord; 2285 address pc = (address)ctx->Rip; 2286 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode"); 2287 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2288 if (pc[0] == 0xF7) { 2289 // set correct result values and continue after idiv instruction 2290 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes 2291 } else { 2292 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes 2293 } 2294 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation) 2295 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the 2296 // idiv opcode (0xF7). 2297 ctx->Rdx = (DWORD)0; // remainder 2298 // Continue the execution 2299 #else 2300 PCONTEXT ctx = exceptionInfo->ContextRecord; 2301 address pc = (address)ctx->Eip; 2302 assert(pc[0] == 0xF7, "not an idiv opcode"); 2303 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2304 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2305 // set correct result values and continue after idiv instruction 2306 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2307 ctx->Eax = (DWORD)min_jint; // result 2308 ctx->Edx = (DWORD)0; // remainder 2309 // Continue the execution 2310 #endif 2311 #endif 2312 return EXCEPTION_CONTINUE_EXECUTION; 2313 } 2314 2315 //----------------------------------------------------------------------------- 2316 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2317 PCONTEXT ctx = exceptionInfo->ContextRecord; 2318 #ifndef _WIN64 2319 // handle exception caused by native method modifying control word 2320 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2321 2322 switch (exception_code) { 2323 case EXCEPTION_FLT_DENORMAL_OPERAND: 2324 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2325 case EXCEPTION_FLT_INEXACT_RESULT: 2326 case EXCEPTION_FLT_INVALID_OPERATION: 2327 case EXCEPTION_FLT_OVERFLOW: 2328 case EXCEPTION_FLT_STACK_CHECK: 2329 case EXCEPTION_FLT_UNDERFLOW: 2330 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2331 if (fp_control_word != ctx->FloatSave.ControlWord) { 2332 // Restore FPCW and mask out FLT exceptions 2333 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2334 // Mask out pending FLT exceptions 2335 ctx->FloatSave.StatusWord &= 0xffffff00; 2336 return EXCEPTION_CONTINUE_EXECUTION; 2337 } 2338 } 2339 2340 if (prev_uef_handler != NULL) { 2341 // We didn't handle this exception so pass it to the previous 2342 // UnhandledExceptionFilter. 2343 return (prev_uef_handler)(exceptionInfo); 2344 } 2345 #else // !_WIN64 2346 // On Windows, the mxcsr control bits are non-volatile across calls 2347 // See also CR 6192333 2348 // 2349 jint MxCsr = INITIAL_MXCSR; 2350 // we can't use StubRoutines::addr_mxcsr_std() 2351 // because in Win64 mxcsr is not saved there 2352 if (MxCsr != ctx->MxCsr) { 2353 ctx->MxCsr = MxCsr; 2354 return EXCEPTION_CONTINUE_EXECUTION; 2355 } 2356 #endif // !_WIN64 2357 2358 return EXCEPTION_CONTINUE_SEARCH; 2359 } 2360 2361 static inline void report_error(Thread* t, DWORD exception_code, 2362 address addr, void* siginfo, void* context) { 2363 VMError::report_and_die(t, exception_code, addr, siginfo, context); 2364 2365 // If UseOsErrorReporting, this will return here and save the error file 2366 // somewhere where we can find it in the minidump. 2367 } 2368 2369 //----------------------------------------------------------------------------- 2370 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2371 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2372 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2373 #ifdef _M_IA64 2374 // On Itanium, we need the "precise pc", which has the slot number coded 2375 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format). 2376 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress; 2377 // Convert the pc to "Unix format", which has the slot number coded 2378 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2 2379 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction" 2380 // information is saved in the Unix format. 2381 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2)); 2382 #else 2383 #ifdef _M_AMD64 2384 address pc = (address) exceptionInfo->ContextRecord->Rip; 2385 #else 2386 address pc = (address) exceptionInfo->ContextRecord->Eip; 2387 #endif 2388 #endif 2389 Thread* t = Thread::current_or_null_safe(); 2390 2391 // Handle SafeFetch32 and SafeFetchN exceptions. 2392 if (StubRoutines::is_safefetch_fault(pc)) { 2393 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc)); 2394 } 2395 2396 #ifndef _WIN64 2397 // Execution protection violation - win32 running on AMD64 only 2398 // Handled first to avoid misdiagnosis as a "normal" access violation; 2399 // This is safe to do because we have a new/unique ExceptionInformation 2400 // code for this condition. 2401 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2402 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2403 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2404 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2405 2406 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2407 int page_size = os::vm_page_size(); 2408 2409 // Make sure the pc and the faulting address are sane. 2410 // 2411 // If an instruction spans a page boundary, and the page containing 2412 // the beginning of the instruction is executable but the following 2413 // page is not, the pc and the faulting address might be slightly 2414 // different - we still want to unguard the 2nd page in this case. 2415 // 2416 // 15 bytes seems to be a (very) safe value for max instruction size. 2417 bool pc_is_near_addr = 2418 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2419 bool instr_spans_page_boundary = 2420 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2421 (intptr_t) page_size) > 0); 2422 2423 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2424 static volatile address last_addr = 2425 (address) os::non_memory_address_word(); 2426 2427 // In conservative mode, don't unguard unless the address is in the VM 2428 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2429 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2430 2431 // Set memory to RWX and retry 2432 address page_start = 2433 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2434 bool res = os::protect_memory((char*) page_start, page_size, 2435 os::MEM_PROT_RWX); 2436 2437 if (PrintMiscellaneous && Verbose) { 2438 char buf[256]; 2439 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 2440 "at " INTPTR_FORMAT 2441 ", unguarding " INTPTR_FORMAT ": %s", addr, 2442 page_start, (res ? "success" : strerror(errno))); 2443 tty->print_raw_cr(buf); 2444 } 2445 2446 // Set last_addr so if we fault again at the same address, we don't 2447 // end up in an endless loop. 2448 // 2449 // There are two potential complications here. Two threads trapping 2450 // at the same address at the same time could cause one of the 2451 // threads to think it already unguarded, and abort the VM. Likely 2452 // very rare. 2453 // 2454 // The other race involves two threads alternately trapping at 2455 // different addresses and failing to unguard the page, resulting in 2456 // an endless loop. This condition is probably even more unlikely 2457 // than the first. 2458 // 2459 // Although both cases could be avoided by using locks or thread 2460 // local last_addr, these solutions are unnecessary complication: 2461 // this handler is a best-effort safety net, not a complete solution. 2462 // It is disabled by default and should only be used as a workaround 2463 // in case we missed any no-execute-unsafe VM code. 2464 2465 last_addr = addr; 2466 2467 return EXCEPTION_CONTINUE_EXECUTION; 2468 } 2469 } 2470 2471 // Last unguard failed or not unguarding 2472 tty->print_raw_cr("Execution protection violation"); 2473 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2474 exceptionInfo->ContextRecord); 2475 return EXCEPTION_CONTINUE_SEARCH; 2476 } 2477 } 2478 #endif // _WIN64 2479 2480 // Check to see if we caught the safepoint code in the 2481 // process of write protecting the memory serialization page. 2482 // It write enables the page immediately after protecting it 2483 // so just return. 2484 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2485 JavaThread* thread = (JavaThread*) t; 2486 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2487 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2488 if (os::is_memory_serialize_page(thread, addr)) { 2489 // Block current thread until the memory serialize page permission restored. 2490 os::block_on_serialize_page_trap(); 2491 return EXCEPTION_CONTINUE_EXECUTION; 2492 } 2493 } 2494 2495 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) && 2496 VM_Version::is_cpuinfo_segv_addr(pc)) { 2497 // Verify that OS save/restore AVX registers. 2498 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr()); 2499 } 2500 2501 if (t != NULL && t->is_Java_thread()) { 2502 JavaThread* thread = (JavaThread*) t; 2503 bool in_java = thread->thread_state() == _thread_in_Java; 2504 2505 // Handle potential stack overflows up front. 2506 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2507 if (os::uses_stack_guard_pages()) { 2508 #ifdef _M_IA64 2509 // Use guard page for register stack. 2510 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2511 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2512 // Check for a register stack overflow on Itanium 2513 if (thread->addr_inside_register_stack_red_zone(addr)) { 2514 // Fatal red zone violation happens if the Java program 2515 // catches a StackOverflow error and does so much processing 2516 // that it runs beyond the unprotected yellow guard zone. As 2517 // a result, we are out of here. 2518 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit."); 2519 } else if(thread->addr_inside_register_stack(addr)) { 2520 // Disable the yellow zone which sets the state that 2521 // we've got a stack overflow problem. 2522 if (thread->stack_yellow_zone_enabled()) { 2523 thread->disable_stack_yellow_zone(); 2524 } 2525 // Give us some room to process the exception. 2526 thread->disable_register_stack_guard(); 2527 // Tracing with +Verbose. 2528 if (Verbose) { 2529 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc); 2530 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr); 2531 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base()); 2532 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]", 2533 thread->register_stack_base(), 2534 thread->register_stack_base() + thread->stack_size()); 2535 } 2536 2537 // Reguard the permanent register stack red zone just to be sure. 2538 // We saw Windows silently disabling this without telling us. 2539 thread->enable_register_stack_red_zone(); 2540 2541 return Handle_Exception(exceptionInfo, 2542 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2543 } 2544 #endif 2545 if (thread->stack_yellow_zone_enabled()) { 2546 // Yellow zone violation. The o/s has unprotected the first yellow 2547 // zone page for us. Note: must call disable_stack_yellow_zone to 2548 // update the enabled status, even if the zone contains only one page. 2549 thread->disable_stack_yellow_zone(); 2550 // If not in java code, return and hope for the best. 2551 return in_java 2552 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2553 : EXCEPTION_CONTINUE_EXECUTION; 2554 } else { 2555 // Fatal red zone violation. 2556 thread->disable_stack_red_zone(); 2557 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2558 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2559 exceptionInfo->ContextRecord); 2560 return EXCEPTION_CONTINUE_SEARCH; 2561 } 2562 } else if (in_java) { 2563 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2564 // a one-time-only guard page, which it has released to us. The next 2565 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2566 return Handle_Exception(exceptionInfo, 2567 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2568 } else { 2569 // Can only return and hope for the best. Further stack growth will 2570 // result in an ACCESS_VIOLATION. 2571 return EXCEPTION_CONTINUE_EXECUTION; 2572 } 2573 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2574 // Either stack overflow or null pointer exception. 2575 if (in_java) { 2576 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2577 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2578 address stack_end = thread->stack_base() - thread->stack_size(); 2579 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2580 // Stack overflow. 2581 assert(!os::uses_stack_guard_pages(), 2582 "should be caught by red zone code above."); 2583 return Handle_Exception(exceptionInfo, 2584 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2585 } 2586 // Check for safepoint polling and implicit null 2587 // We only expect null pointers in the stubs (vtable) 2588 // the rest are checked explicitly now. 2589 CodeBlob* cb = CodeCache::find_blob(pc); 2590 if (cb != NULL) { 2591 if (os::is_poll_address(addr)) { 2592 address stub = SharedRuntime::get_poll_stub(pc); 2593 return Handle_Exception(exceptionInfo, stub); 2594 } 2595 } 2596 { 2597 #ifdef _WIN64 2598 // If it's a legal stack address map the entire region in 2599 // 2600 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2601 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2602 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) { 2603 addr = (address)((uintptr_t)addr & 2604 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2605 os::commit_memory((char *)addr, thread->stack_base() - addr, 2606 !ExecMem); 2607 return EXCEPTION_CONTINUE_EXECUTION; 2608 } else 2609 #endif 2610 { 2611 // Null pointer exception. 2612 #ifdef _M_IA64 2613 // Process implicit null checks in compiled code. Note: Implicit null checks 2614 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs. 2615 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) { 2616 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format); 2617 // Handle implicit null check in UEP method entry 2618 if (cb && (cb->is_frame_complete_at(pc) || 2619 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) { 2620 if (Verbose) { 2621 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0); 2622 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format); 2623 tty->print_cr(" to addr " INTPTR_FORMAT, addr); 2624 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)", 2625 *(bundle_start + 1), *bundle_start); 2626 } 2627 return Handle_Exception(exceptionInfo, 2628 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL)); 2629 } 2630 } 2631 2632 // Implicit null checks were processed above. Hence, we should not reach 2633 // here in the usual case => die! 2634 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception"); 2635 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2636 exceptionInfo->ContextRecord); 2637 return EXCEPTION_CONTINUE_SEARCH; 2638 2639 #else // !IA64 2640 2641 // Windows 98 reports faulting addresses incorrectly 2642 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2643 !os::win32::is_nt()) { 2644 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2645 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2646 } 2647 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2648 exceptionInfo->ContextRecord); 2649 return EXCEPTION_CONTINUE_SEARCH; 2650 #endif 2651 } 2652 } 2653 } 2654 2655 #ifdef _WIN64 2656 // Special care for fast JNI field accessors. 2657 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2658 // in and the heap gets shrunk before the field access. 2659 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2660 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2661 if (addr != (address)-1) { 2662 return Handle_Exception(exceptionInfo, addr); 2663 } 2664 } 2665 #endif 2666 2667 // Stack overflow or null pointer exception in native code. 2668 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2669 exceptionInfo->ContextRecord); 2670 return EXCEPTION_CONTINUE_SEARCH; 2671 } // /EXCEPTION_ACCESS_VIOLATION 2672 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2673 #if defined _M_IA64 2674 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION || 2675 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) { 2676 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0); 2677 2678 // Compiled method patched to be non entrant? Following conditions must apply: 2679 // 1. must be first instruction in bundle 2680 // 2. must be a break instruction with appropriate code 2681 if ((((uint64_t) pc & 0x0F) == 0) && 2682 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) { 2683 return Handle_Exception(exceptionInfo, 2684 (address)SharedRuntime::get_handle_wrong_method_stub()); 2685 } 2686 } // /EXCEPTION_ILLEGAL_INSTRUCTION 2687 #endif 2688 2689 2690 if (in_java) { 2691 switch (exception_code) { 2692 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2693 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2694 2695 case EXCEPTION_INT_OVERFLOW: 2696 return Handle_IDiv_Exception(exceptionInfo); 2697 2698 } // switch 2699 } 2700 if (((thread->thread_state() == _thread_in_Java) || 2701 (thread->thread_state() == _thread_in_native)) && 2702 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) { 2703 LONG result=Handle_FLT_Exception(exceptionInfo); 2704 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2705 } 2706 } 2707 2708 if (exception_code != EXCEPTION_BREAKPOINT) { 2709 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2710 exceptionInfo->ContextRecord); 2711 } 2712 return EXCEPTION_CONTINUE_SEARCH; 2713 } 2714 2715 #ifndef _WIN64 2716 // Special care for fast JNI accessors. 2717 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2718 // the heap gets shrunk before the field access. 2719 // Need to install our own structured exception handler since native code may 2720 // install its own. 2721 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2722 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2723 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2724 address pc = (address) exceptionInfo->ContextRecord->Eip; 2725 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2726 if (addr != (address)-1) { 2727 return Handle_Exception(exceptionInfo, addr); 2728 } 2729 } 2730 return EXCEPTION_CONTINUE_SEARCH; 2731 } 2732 2733 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \ 2734 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \ 2735 jobject obj, \ 2736 jfieldID fieldID) { \ 2737 __try { \ 2738 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \ 2739 obj, \ 2740 fieldID); \ 2741 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \ 2742 _exception_info())) { \ 2743 } \ 2744 return 0; \ 2745 } 2746 2747 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2748 DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2749 DEFINE_FAST_GETFIELD(jchar, char, Char) 2750 DEFINE_FAST_GETFIELD(jshort, short, Short) 2751 DEFINE_FAST_GETFIELD(jint, int, Int) 2752 DEFINE_FAST_GETFIELD(jlong, long, Long) 2753 DEFINE_FAST_GETFIELD(jfloat, float, Float) 2754 DEFINE_FAST_GETFIELD(jdouble, double, Double) 2755 2756 address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2757 switch (type) { 2758 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2759 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2760 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2761 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2762 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2763 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2764 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2765 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2766 default: ShouldNotReachHere(); 2767 } 2768 return (address)-1; 2769 } 2770 #endif 2771 2772 // Virtual Memory 2773 2774 int os::vm_page_size() { return os::win32::vm_page_size(); } 2775 int os::vm_allocation_granularity() { 2776 return os::win32::vm_allocation_granularity(); 2777 } 2778 2779 // Windows large page support is available on Windows 2003. In order to use 2780 // large page memory, the administrator must first assign additional privilege 2781 // to the user: 2782 // + select Control Panel -> Administrative Tools -> Local Security Policy 2783 // + select Local Policies -> User Rights Assignment 2784 // + double click "Lock pages in memory", add users and/or groups 2785 // + reboot 2786 // Note the above steps are needed for administrator as well, as administrators 2787 // by default do not have the privilege to lock pages in memory. 2788 // 2789 // Note about Windows 2003: although the API supports committing large page 2790 // memory on a page-by-page basis and VirtualAlloc() returns success under this 2791 // scenario, I found through experiment it only uses large page if the entire 2792 // memory region is reserved and committed in a single VirtualAlloc() call. 2793 // This makes Windows large page support more or less like Solaris ISM, in 2794 // that the entire heap must be committed upfront. This probably will change 2795 // in the future, if so the code below needs to be revisited. 2796 2797 #ifndef MEM_LARGE_PAGES 2798 #define MEM_LARGE_PAGES 0x20000000 2799 #endif 2800 2801 static HANDLE _hProcess; 2802 static HANDLE _hToken; 2803 2804 // Container for NUMA node list info 2805 class NUMANodeListHolder { 2806 private: 2807 int *_numa_used_node_list; // allocated below 2808 int _numa_used_node_count; 2809 2810 void free_node_list() { 2811 if (_numa_used_node_list != NULL) { 2812 FREE_C_HEAP_ARRAY(int, _numa_used_node_list); 2813 } 2814 } 2815 2816 public: 2817 NUMANodeListHolder() { 2818 _numa_used_node_count = 0; 2819 _numa_used_node_list = NULL; 2820 // do rest of initialization in build routine (after function pointers are set up) 2821 } 2822 2823 ~NUMANodeListHolder() { 2824 free_node_list(); 2825 } 2826 2827 bool build() { 2828 DWORD_PTR proc_aff_mask; 2829 DWORD_PTR sys_aff_mask; 2830 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false; 2831 ULONG highest_node_number; 2832 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false; 2833 free_node_list(); 2834 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal); 2835 for (unsigned int i = 0; i <= highest_node_number; i++) { 2836 ULONGLONG proc_mask_numa_node; 2837 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false; 2838 if ((proc_aff_mask & proc_mask_numa_node)!=0) { 2839 _numa_used_node_list[_numa_used_node_count++] = i; 2840 } 2841 } 2842 return (_numa_used_node_count > 1); 2843 } 2844 2845 int get_count() { return _numa_used_node_count; } 2846 int get_node_list_entry(int n) { 2847 // for indexes out of range, returns -1 2848 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1); 2849 } 2850 2851 } numa_node_list_holder; 2852 2853 2854 2855 static size_t _large_page_size = 0; 2856 2857 static bool resolve_functions_for_large_page_init() { 2858 return os::Kernel32Dll::GetLargePageMinimumAvailable() && 2859 os::Advapi32Dll::AdvapiAvailable(); 2860 } 2861 2862 static bool request_lock_memory_privilege() { 2863 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2864 os::current_process_id()); 2865 2866 LUID luid; 2867 if (_hProcess != NULL && 2868 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2869 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2870 2871 TOKEN_PRIVILEGES tp; 2872 tp.PrivilegeCount = 1; 2873 tp.Privileges[0].Luid = luid; 2874 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2875 2876 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2877 // privilege. Check GetLastError() too. See MSDN document. 2878 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2879 (GetLastError() == ERROR_SUCCESS)) { 2880 return true; 2881 } 2882 } 2883 2884 return false; 2885 } 2886 2887 static void cleanup_after_large_page_init() { 2888 if (_hProcess) CloseHandle(_hProcess); 2889 _hProcess = NULL; 2890 if (_hToken) CloseHandle(_hToken); 2891 _hToken = NULL; 2892 } 2893 2894 static bool numa_interleaving_init() { 2895 bool success = false; 2896 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving); 2897 2898 // print a warning if UseNUMAInterleaving flag is specified on command line 2899 bool warn_on_failure = use_numa_interleaving_specified; 2900 #define WARN(msg) if (warn_on_failure) { warning(msg); } 2901 2902 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages) 2903 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2904 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity); 2905 2906 if (os::Kernel32Dll::NumaCallsAvailable()) { 2907 if (numa_node_list_holder.build()) { 2908 if (PrintMiscellaneous && Verbose) { 2909 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count()); 2910 for (int i = 0; i < numa_node_list_holder.get_count(); i++) { 2911 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i)); 2912 } 2913 tty->print("\n"); 2914 } 2915 success = true; 2916 } else { 2917 WARN("Process does not cover multiple NUMA nodes."); 2918 } 2919 } else { 2920 WARN("NUMA Interleaving is not supported by the operating system."); 2921 } 2922 if (!success) { 2923 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag."); 2924 } 2925 return success; 2926 #undef WARN 2927 } 2928 2929 // this routine is used whenever we need to reserve a contiguous VA range 2930 // but we need to make separate VirtualAlloc calls for each piece of the range 2931 // Reasons for doing this: 2932 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise) 2933 // * UseNUMAInterleaving requires a separate node for each piece 2934 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, 2935 DWORD prot, 2936 bool should_inject_error = false) { 2937 char * p_buf; 2938 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size 2939 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2940 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size; 2941 2942 // first reserve enough address space in advance since we want to be 2943 // able to break a single contiguous virtual address range into multiple 2944 // large page commits but WS2003 does not allow reserving large page space 2945 // so we just use 4K pages for reserve, this gives us a legal contiguous 2946 // address space. then we will deallocate that reservation, and re alloc 2947 // using large pages 2948 const size_t size_of_reserve = bytes + chunk_size; 2949 if (bytes > size_of_reserve) { 2950 // Overflowed. 2951 return NULL; 2952 } 2953 p_buf = (char *) VirtualAlloc(addr, 2954 size_of_reserve, // size of Reserve 2955 MEM_RESERVE, 2956 PAGE_READWRITE); 2957 // If reservation failed, return NULL 2958 if (p_buf == NULL) return NULL; 2959 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC); 2960 os::release_memory(p_buf, bytes + chunk_size); 2961 2962 // we still need to round up to a page boundary (in case we are using large pages) 2963 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size) 2964 // instead we handle this in the bytes_to_rq computation below 2965 p_buf = (char *) align_size_up((size_t)p_buf, page_size); 2966 2967 // now go through and allocate one chunk at a time until all bytes are 2968 // allocated 2969 size_t bytes_remaining = bytes; 2970 // An overflow of align_size_up() would have been caught above 2971 // in the calculation of size_of_reserve. 2972 char * next_alloc_addr = p_buf; 2973 HANDLE hProc = GetCurrentProcess(); 2974 2975 #ifdef ASSERT 2976 // Variable for the failure injection 2977 long ran_num = os::random(); 2978 size_t fail_after = ran_num % bytes; 2979 #endif 2980 2981 int count=0; 2982 while (bytes_remaining) { 2983 // select bytes_to_rq to get to the next chunk_size boundary 2984 2985 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size)); 2986 // Note allocate and commit 2987 char * p_new; 2988 2989 #ifdef ASSERT 2990 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after); 2991 #else 2992 const bool inject_error_now = false; 2993 #endif 2994 2995 if (inject_error_now) { 2996 p_new = NULL; 2997 } else { 2998 if (!UseNUMAInterleaving) { 2999 p_new = (char *) VirtualAlloc(next_alloc_addr, 3000 bytes_to_rq, 3001 flags, 3002 prot); 3003 } else { 3004 // get the next node to use from the used_node_list 3005 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected"); 3006 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count()); 3007 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc, 3008 next_alloc_addr, 3009 bytes_to_rq, 3010 flags, 3011 prot, 3012 node); 3013 } 3014 } 3015 3016 if (p_new == NULL) { 3017 // Free any allocated pages 3018 if (next_alloc_addr > p_buf) { 3019 // Some memory was committed so release it. 3020 size_t bytes_to_release = bytes - bytes_remaining; 3021 // NMT has yet to record any individual blocks, so it 3022 // need to create a dummy 'reserve' record to match 3023 // the release. 3024 MemTracker::record_virtual_memory_reserve((address)p_buf, 3025 bytes_to_release, CALLER_PC); 3026 os::release_memory(p_buf, bytes_to_release); 3027 } 3028 #ifdef ASSERT 3029 if (should_inject_error) { 3030 if (TracePageSizes && Verbose) { 3031 tty->print_cr("Reserving pages individually failed."); 3032 } 3033 } 3034 #endif 3035 return NULL; 3036 } 3037 3038 bytes_remaining -= bytes_to_rq; 3039 next_alloc_addr += bytes_to_rq; 3040 count++; 3041 } 3042 // Although the memory is allocated individually, it is returned as one. 3043 // NMT records it as one block. 3044 if ((flags & MEM_COMMIT) != 0) { 3045 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC); 3046 } else { 3047 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC); 3048 } 3049 3050 // made it this far, success 3051 return p_buf; 3052 } 3053 3054 3055 3056 void os::large_page_init() { 3057 if (!UseLargePages) return; 3058 3059 // print a warning if any large page related flag is specified on command line 3060 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 3061 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 3062 bool success = false; 3063 3064 #define WARN(msg) if (warn_on_failure) { warning(msg); } 3065 if (resolve_functions_for_large_page_init()) { 3066 if (request_lock_memory_privilege()) { 3067 size_t s = os::Kernel32Dll::GetLargePageMinimum(); 3068 if (s) { 3069 #if defined(IA32) || defined(AMD64) 3070 if (s > 4*M || LargePageSizeInBytes > 4*M) { 3071 WARN("JVM cannot use large pages bigger than 4mb."); 3072 } else { 3073 #endif 3074 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 3075 _large_page_size = LargePageSizeInBytes; 3076 } else { 3077 _large_page_size = s; 3078 } 3079 success = true; 3080 #if defined(IA32) || defined(AMD64) 3081 } 3082 #endif 3083 } else { 3084 WARN("Large page is not supported by the processor."); 3085 } 3086 } else { 3087 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 3088 } 3089 } else { 3090 WARN("Large page is not supported by the operating system."); 3091 } 3092 #undef WARN 3093 3094 const size_t default_page_size = (size_t) vm_page_size(); 3095 if (success && _large_page_size > default_page_size) { 3096 _page_sizes[0] = _large_page_size; 3097 _page_sizes[1] = default_page_size; 3098 _page_sizes[2] = 0; 3099 } 3100 3101 cleanup_after_large_page_init(); 3102 UseLargePages = success; 3103 } 3104 3105 // On win32, one cannot release just a part of reserved memory, it's an 3106 // all or nothing deal. When we split a reservation, we must break the 3107 // reservation into two reservations. 3108 void os::pd_split_reserved_memory(char *base, size_t size, size_t split, 3109 bool realloc) { 3110 if (size > 0) { 3111 release_memory(base, size); 3112 if (realloc) { 3113 reserve_memory(split, base); 3114 } 3115 if (size != split) { 3116 reserve_memory(size - split, base + split); 3117 } 3118 } 3119 } 3120 3121 // Multiple threads can race in this code but it's not possible to unmap small sections of 3122 // virtual space to get requested alignment, like posix-like os's. 3123 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe. 3124 char* os::reserve_memory_aligned(size_t size, size_t alignment) { 3125 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 3126 "Alignment must be a multiple of allocation granularity (page size)"); 3127 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 3128 3129 size_t extra_size = size + alignment; 3130 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 3131 3132 char* aligned_base = NULL; 3133 3134 do { 3135 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 3136 if (extra_base == NULL) { 3137 return NULL; 3138 } 3139 // Do manual alignment 3140 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 3141 3142 os::release_memory(extra_base, extra_size); 3143 3144 aligned_base = os::reserve_memory(size, aligned_base); 3145 3146 } while (aligned_base == NULL); 3147 3148 return aligned_base; 3149 } 3150 3151 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 3152 assert((size_t)addr % os::vm_allocation_granularity() == 0, 3153 "reserve alignment"); 3154 assert(bytes % os::vm_page_size() == 0, "reserve page size"); 3155 char* res; 3156 // note that if UseLargePages is on, all the areas that require interleaving 3157 // will go thru reserve_memory_special rather than thru here. 3158 bool use_individual = (UseNUMAInterleaving && !UseLargePages); 3159 if (!use_individual) { 3160 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 3161 } else { 3162 elapsedTimer reserveTimer; 3163 if (Verbose && PrintMiscellaneous) reserveTimer.start(); 3164 // in numa interleaving, we have to allocate pages individually 3165 // (well really chunks of NUMAInterleaveGranularity size) 3166 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE); 3167 if (res == NULL) { 3168 warning("NUMA page allocation failed"); 3169 } 3170 if (Verbose && PrintMiscellaneous) { 3171 reserveTimer.stop(); 3172 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes, 3173 reserveTimer.milliseconds(), reserveTimer.ticks()); 3174 } 3175 } 3176 assert(res == NULL || addr == NULL || addr == res, 3177 "Unexpected address from reserve."); 3178 3179 return res; 3180 } 3181 3182 // Reserve memory at an arbitrary address, only if that area is 3183 // available (and not reserved for something else). 3184 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3185 // Windows os::reserve_memory() fails of the requested address range is 3186 // not avilable. 3187 return reserve_memory(bytes, requested_addr); 3188 } 3189 3190 size_t os::large_page_size() { 3191 return _large_page_size; 3192 } 3193 3194 bool os::can_commit_large_page_memory() { 3195 // Windows only uses large page memory when the entire region is reserved 3196 // and committed in a single VirtualAlloc() call. This may change in the 3197 // future, but with Windows 2003 it's not possible to commit on demand. 3198 return false; 3199 } 3200 3201 bool os::can_execute_large_page_memory() { 3202 return true; 3203 } 3204 3205 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, 3206 bool exec) { 3207 assert(UseLargePages, "only for large pages"); 3208 3209 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { 3210 return NULL; // Fallback to small pages. 3211 } 3212 3213 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 3214 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3215 3216 // with large pages, there are two cases where we need to use Individual Allocation 3217 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003) 3218 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page 3219 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) { 3220 if (TracePageSizes && Verbose) { 3221 tty->print_cr("Reserving large pages individually."); 3222 } 3223 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError); 3224 if (p_buf == NULL) { 3225 // give an appropriate warning message 3226 if (UseNUMAInterleaving) { 3227 warning("NUMA large page allocation failed, UseLargePages flag ignored"); 3228 } 3229 if (UseLargePagesIndividualAllocation) { 3230 warning("Individually allocated large pages failed, " 3231 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 3232 } 3233 return NULL; 3234 } 3235 3236 return p_buf; 3237 3238 } else { 3239 if (TracePageSizes && Verbose) { 3240 tty->print_cr("Reserving large pages in a single large chunk."); 3241 } 3242 // normal policy just allocate it all at once 3243 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3244 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); 3245 if (res != NULL) { 3246 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC); 3247 } 3248 3249 return res; 3250 } 3251 } 3252 3253 bool os::release_memory_special(char* base, size_t bytes) { 3254 assert(base != NULL, "Sanity check"); 3255 return release_memory(base, bytes); 3256 } 3257 3258 void os::print_statistics() { 3259 } 3260 3261 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) { 3262 int err = os::get_last_error(); 3263 char buf[256]; 3264 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3265 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 3266 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3267 exec, buf_len != 0 ? buf : "<no_error_string>", err); 3268 } 3269 3270 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 3271 if (bytes == 0) { 3272 // Don't bother the OS with noops. 3273 return true; 3274 } 3275 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 3276 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 3277 // Don't attempt to print anything if the OS call fails. We're 3278 // probably low on resources, so the print itself may cause crashes. 3279 3280 // unless we have NUMAInterleaving enabled, the range of a commit 3281 // is always within a reserve covered by a single VirtualAlloc 3282 // in that case we can just do a single commit for the requested size 3283 if (!UseNUMAInterleaving) { 3284 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) { 3285 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3286 return false; 3287 } 3288 if (exec) { 3289 DWORD oldprot; 3290 // Windows doc says to use VirtualProtect to get execute permissions 3291 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) { 3292 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3293 return false; 3294 } 3295 } 3296 return true; 3297 } else { 3298 3299 // when NUMAInterleaving is enabled, the commit might cover a range that 3300 // came from multiple VirtualAlloc reserves (using allocate_pages_individually). 3301 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery 3302 // returns represents the number of bytes that can be committed in one step. 3303 size_t bytes_remaining = bytes; 3304 char * next_alloc_addr = addr; 3305 while (bytes_remaining > 0) { 3306 MEMORY_BASIC_INFORMATION alloc_info; 3307 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info)); 3308 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3309 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, 3310 PAGE_READWRITE) == NULL) { 3311 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3312 exec);) 3313 return false; 3314 } 3315 if (exec) { 3316 DWORD oldprot; 3317 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, 3318 PAGE_EXECUTE_READWRITE, &oldprot)) { 3319 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3320 exec);) 3321 return false; 3322 } 3323 } 3324 bytes_remaining -= bytes_to_rq; 3325 next_alloc_addr += bytes_to_rq; 3326 } 3327 } 3328 // if we made it this far, return true 3329 return true; 3330 } 3331 3332 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 3333 bool exec) { 3334 // alignment_hint is ignored on this OS 3335 return pd_commit_memory(addr, size, exec); 3336 } 3337 3338 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 3339 const char* mesg) { 3340 assert(mesg != NULL, "mesg must be specified"); 3341 if (!pd_commit_memory(addr, size, exec)) { 3342 warn_fail_commit_memory(addr, size, exec); 3343 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 3344 } 3345 } 3346 3347 void os::pd_commit_memory_or_exit(char* addr, size_t size, 3348 size_t alignment_hint, bool exec, 3349 const char* mesg) { 3350 // alignment_hint is ignored on this OS 3351 pd_commit_memory_or_exit(addr, size, exec, mesg); 3352 } 3353 3354 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3355 if (bytes == 0) { 3356 // Don't bother the OS with noops. 3357 return true; 3358 } 3359 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 3360 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 3361 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0); 3362 } 3363 3364 bool os::pd_release_memory(char* addr, size_t bytes) { 3365 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 3366 } 3367 3368 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 3369 return os::commit_memory(addr, size, !ExecMem); 3370 } 3371 3372 bool os::remove_stack_guard_pages(char* addr, size_t size) { 3373 return os::uncommit_memory(addr, size); 3374 } 3375 3376 // Set protections specified 3377 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3378 bool is_committed) { 3379 unsigned int p = 0; 3380 switch (prot) { 3381 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 3382 case MEM_PROT_READ: p = PAGE_READONLY; break; 3383 case MEM_PROT_RW: p = PAGE_READWRITE; break; 3384 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 3385 default: 3386 ShouldNotReachHere(); 3387 } 3388 3389 DWORD old_status; 3390 3391 // Strange enough, but on Win32 one can change protection only for committed 3392 // memory, not a big deal anyway, as bytes less or equal than 64K 3393 if (!is_committed) { 3394 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX, 3395 "cannot commit protection page"); 3396 } 3397 // One cannot use os::guard_memory() here, as on Win32 guard page 3398 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 3399 // 3400 // Pages in the region become guard pages. Any attempt to access a guard page 3401 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 3402 // the guard page status. Guard pages thus act as a one-time access alarm. 3403 return VirtualProtect(addr, bytes, p, &old_status) != 0; 3404 } 3405 3406 bool os::guard_memory(char* addr, size_t bytes) { 3407 DWORD old_status; 3408 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 3409 } 3410 3411 bool os::unguard_memory(char* addr, size_t bytes) { 3412 DWORD old_status; 3413 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 3414 } 3415 3416 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3417 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3418 void os::numa_make_global(char *addr, size_t bytes) { } 3419 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 3420 bool os::numa_topology_changed() { return false; } 3421 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); } 3422 int os::numa_get_group_id() { return 0; } 3423 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 3424 if (numa_node_list_holder.get_count() == 0 && size > 0) { 3425 // Provide an answer for UMA systems 3426 ids[0] = 0; 3427 return 1; 3428 } else { 3429 // check for size bigger than actual groups_num 3430 size = MIN2(size, numa_get_groups_num()); 3431 for (int i = 0; i < (int)size; i++) { 3432 ids[i] = numa_node_list_holder.get_node_list_entry(i); 3433 } 3434 return size; 3435 } 3436 } 3437 3438 bool os::get_page_info(char *start, page_info* info) { 3439 return false; 3440 } 3441 3442 char *os::scan_pages(char *start, char* end, page_info* page_expected, 3443 page_info* page_found) { 3444 return end; 3445 } 3446 3447 char* os::non_memory_address_word() { 3448 // Must never look like an address returned by reserve_memory, 3449 // even in its subfields (as defined by the CPU immediate fields, 3450 // if the CPU splits constants across multiple instructions). 3451 return (char*)-1; 3452 } 3453 3454 #define MAX_ERROR_COUNT 100 3455 #define SYS_THREAD_ERROR 0xffffffffUL 3456 3457 void os::pd_start_thread(Thread* thread) { 3458 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 3459 // Returns previous suspend state: 3460 // 0: Thread was not suspended 3461 // 1: Thread is running now 3462 // >1: Thread is still suspended. 3463 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3464 } 3465 3466 class HighResolutionInterval : public CHeapObj<mtThread> { 3467 // The default timer resolution seems to be 10 milliseconds. 3468 // (Where is this written down?) 3469 // If someone wants to sleep for only a fraction of the default, 3470 // then we set the timer resolution down to 1 millisecond for 3471 // the duration of their interval. 3472 // We carefully set the resolution back, since otherwise we 3473 // seem to incur an overhead (3%?) that we don't need. 3474 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 3475 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 3476 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 3477 // timeBeginPeriod() if the relative error exceeded some threshold. 3478 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 3479 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 3480 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 3481 // resolution timers running. 3482 private: 3483 jlong resolution; 3484 public: 3485 HighResolutionInterval(jlong ms) { 3486 resolution = ms % 10L; 3487 if (resolution != 0) { 3488 MMRESULT result = timeBeginPeriod(1L); 3489 } 3490 } 3491 ~HighResolutionInterval() { 3492 if (resolution != 0) { 3493 MMRESULT result = timeEndPeriod(1L); 3494 } 3495 resolution = 0L; 3496 } 3497 }; 3498 3499 int os::sleep(Thread* thread, jlong ms, bool interruptable) { 3500 jlong limit = (jlong) MAXDWORD; 3501 3502 while (ms > limit) { 3503 int res; 3504 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) { 3505 return res; 3506 } 3507 ms -= limit; 3508 } 3509 3510 assert(thread == Thread::current(), "thread consistency check"); 3511 OSThread* osthread = thread->osthread(); 3512 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 3513 int result; 3514 if (interruptable) { 3515 assert(thread->is_Java_thread(), "must be java thread"); 3516 JavaThread *jt = (JavaThread *) thread; 3517 ThreadBlockInVM tbivm(jt); 3518 3519 jt->set_suspend_equivalent(); 3520 // cleared by handle_special_suspend_equivalent_condition() or 3521 // java_suspend_self() via check_and_wait_while_suspended() 3522 3523 HANDLE events[1]; 3524 events[0] = osthread->interrupt_event(); 3525 HighResolutionInterval *phri=NULL; 3526 if (!ForceTimeHighResolution) { 3527 phri = new HighResolutionInterval(ms); 3528 } 3529 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 3530 result = OS_TIMEOUT; 3531 } else { 3532 ResetEvent(osthread->interrupt_event()); 3533 osthread->set_interrupted(false); 3534 result = OS_INTRPT; 3535 } 3536 delete phri; //if it is NULL, harmless 3537 3538 // were we externally suspended while we were waiting? 3539 jt->check_and_wait_while_suspended(); 3540 } else { 3541 assert(!thread->is_Java_thread(), "must not be java thread"); 3542 Sleep((long) ms); 3543 result = OS_TIMEOUT; 3544 } 3545 return result; 3546 } 3547 3548 // Short sleep, direct OS call. 3549 // 3550 // ms = 0, means allow others (if any) to run. 3551 // 3552 void os::naked_short_sleep(jlong ms) { 3553 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3554 Sleep(ms); 3555 } 3556 3557 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3558 void os::infinite_sleep() { 3559 while (true) { // sleep forever ... 3560 Sleep(100000); // ... 100 seconds at a time 3561 } 3562 } 3563 3564 typedef BOOL (WINAPI * STTSignature)(void); 3565 3566 void os::naked_yield() { 3567 // Use either SwitchToThread() or Sleep(0) 3568 // Consider passing back the return value from SwitchToThread(). 3569 if (os::Kernel32Dll::SwitchToThreadAvailable()) { 3570 SwitchToThread(); 3571 } else { 3572 Sleep(0); 3573 } 3574 } 3575 3576 // Win32 only gives you access to seven real priorities at a time, 3577 // so we compress Java's ten down to seven. It would be better 3578 // if we dynamically adjusted relative priorities. 3579 3580 int os::java_to_os_priority[CriticalPriority + 1] = { 3581 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3582 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3583 THREAD_PRIORITY_LOWEST, // 2 3584 THREAD_PRIORITY_BELOW_NORMAL, // 3 3585 THREAD_PRIORITY_BELOW_NORMAL, // 4 3586 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3587 THREAD_PRIORITY_NORMAL, // 6 3588 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3589 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3590 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3591 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority 3592 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority 3593 }; 3594 3595 int prio_policy1[CriticalPriority + 1] = { 3596 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3597 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3598 THREAD_PRIORITY_LOWEST, // 2 3599 THREAD_PRIORITY_BELOW_NORMAL, // 3 3600 THREAD_PRIORITY_BELOW_NORMAL, // 4 3601 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3602 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3603 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3604 THREAD_PRIORITY_HIGHEST, // 8 3605 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3606 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority 3607 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority 3608 }; 3609 3610 static int prio_init() { 3611 // If ThreadPriorityPolicy is 1, switch tables 3612 if (ThreadPriorityPolicy == 1) { 3613 int i; 3614 for (i = 0; i < CriticalPriority + 1; i++) { 3615 os::java_to_os_priority[i] = prio_policy1[i]; 3616 } 3617 } 3618 if (UseCriticalJavaThreadPriority) { 3619 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 3620 } 3621 return 0; 3622 } 3623 3624 OSReturn os::set_native_priority(Thread* thread, int priority) { 3625 if (!UseThreadPriorities) return OS_OK; 3626 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3627 return ret ? OS_OK : OS_ERR; 3628 } 3629 3630 OSReturn os::get_native_priority(const Thread* const thread, 3631 int* priority_ptr) { 3632 if (!UseThreadPriorities) { 3633 *priority_ptr = java_to_os_priority[NormPriority]; 3634 return OS_OK; 3635 } 3636 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3637 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3638 assert(false, "GetThreadPriority failed"); 3639 return OS_ERR; 3640 } 3641 *priority_ptr = os_prio; 3642 return OS_OK; 3643 } 3644 3645 3646 // Hint to the underlying OS that a task switch would not be good. 3647 // Void return because it's a hint and can fail. 3648 void os::hint_no_preempt() {} 3649 3650 void os::interrupt(Thread* thread) { 3651 assert(!thread->is_Java_thread() || Thread::current() == thread || 3652 Threads_lock->owned_by_self(), 3653 "possibility of dangling Thread pointer"); 3654 3655 OSThread* osthread = thread->osthread(); 3656 osthread->set_interrupted(true); 3657 // More than one thread can get here with the same value of osthread, 3658 // resulting in multiple notifications. We do, however, want the store 3659 // to interrupted() to be visible to other threads before we post 3660 // the interrupt event. 3661 OrderAccess::release(); 3662 SetEvent(osthread->interrupt_event()); 3663 // For JSR166: unpark after setting status 3664 if (thread->is_Java_thread()) { 3665 ((JavaThread*)thread)->parker()->unpark(); 3666 } 3667 3668 ParkEvent * ev = thread->_ParkEvent; 3669 if (ev != NULL) ev->unpark(); 3670 } 3671 3672 3673 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3674 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3675 "possibility of dangling Thread pointer"); 3676 3677 OSThread* osthread = thread->osthread(); 3678 // There is no synchronization between the setting of the interrupt 3679 // and it being cleared here. It is critical - see 6535709 - that 3680 // we only clear the interrupt state, and reset the interrupt event, 3681 // if we are going to report that we were indeed interrupted - else 3682 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups 3683 // depending on the timing. By checking thread interrupt event to see 3684 // if the thread gets real interrupt thus prevent spurious wakeup. 3685 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0); 3686 if (interrupted && clear_interrupted) { 3687 osthread->set_interrupted(false); 3688 ResetEvent(osthread->interrupt_event()); 3689 } // Otherwise leave the interrupted state alone 3690 3691 return interrupted; 3692 } 3693 3694 // Get's a pc (hint) for a running thread. Currently used only for profiling. 3695 ExtendedPC os::get_thread_pc(Thread* thread) { 3696 CONTEXT context; 3697 context.ContextFlags = CONTEXT_CONTROL; 3698 HANDLE handle = thread->osthread()->thread_handle(); 3699 #ifdef _M_IA64 3700 assert(0, "Fix get_thread_pc"); 3701 return ExtendedPC(NULL); 3702 #else 3703 if (GetThreadContext(handle, &context)) { 3704 #ifdef _M_AMD64 3705 return ExtendedPC((address) context.Rip); 3706 #else 3707 return ExtendedPC((address) context.Eip); 3708 #endif 3709 } else { 3710 return ExtendedPC(NULL); 3711 } 3712 #endif 3713 } 3714 3715 // GetCurrentThreadId() returns DWORD 3716 intx os::current_thread_id() { return GetCurrentThreadId(); } 3717 3718 static int _initial_pid = 0; 3719 3720 int os::current_process_id() { 3721 return (_initial_pid ? _initial_pid : _getpid()); 3722 } 3723 3724 int os::win32::_vm_page_size = 0; 3725 int os::win32::_vm_allocation_granularity = 0; 3726 int os::win32::_processor_type = 0; 3727 // Processor level is not available on non-NT systems, use vm_version instead 3728 int os::win32::_processor_level = 0; 3729 julong os::win32::_physical_memory = 0; 3730 size_t os::win32::_default_stack_size = 0; 3731 3732 intx os::win32::_os_thread_limit = 0; 3733 volatile intx os::win32::_os_thread_count = 0; 3734 3735 bool os::win32::_is_nt = false; 3736 bool os::win32::_is_windows_2003 = false; 3737 bool os::win32::_is_windows_server = false; 3738 3739 // 6573254 3740 // Currently, the bug is observed across all the supported Windows releases, 3741 // including the latest one (as of this writing - Windows Server 2012 R2) 3742 bool os::win32::_has_exit_bug = true; 3743 bool os::win32::_has_performance_count = 0; 3744 3745 void os::win32::initialize_system_info() { 3746 SYSTEM_INFO si; 3747 GetSystemInfo(&si); 3748 _vm_page_size = si.dwPageSize; 3749 _vm_allocation_granularity = si.dwAllocationGranularity; 3750 _processor_type = si.dwProcessorType; 3751 _processor_level = si.wProcessorLevel; 3752 set_processor_count(si.dwNumberOfProcessors); 3753 3754 MEMORYSTATUSEX ms; 3755 ms.dwLength = sizeof(ms); 3756 3757 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3758 // dwMemoryLoad (% of memory in use) 3759 GlobalMemoryStatusEx(&ms); 3760 _physical_memory = ms.ullTotalPhys; 3761 3762 OSVERSIONINFOEX oi; 3763 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 3764 GetVersionEx((OSVERSIONINFO*)&oi); 3765 switch (oi.dwPlatformId) { 3766 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 3767 case VER_PLATFORM_WIN32_NT: 3768 _is_nt = true; 3769 { 3770 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3771 if (os_vers == 5002) { 3772 _is_windows_2003 = true; 3773 } 3774 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER || 3775 oi.wProductType == VER_NT_SERVER) { 3776 _is_windows_server = true; 3777 } 3778 } 3779 break; 3780 default: fatal("Unknown platform"); 3781 } 3782 3783 _default_stack_size = os::current_stack_size(); 3784 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3785 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3786 "stack size not a multiple of page size"); 3787 3788 initialize_performance_counter(); 3789 } 3790 3791 3792 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, 3793 int ebuflen) { 3794 char path[MAX_PATH]; 3795 DWORD size; 3796 DWORD pathLen = (DWORD)sizeof(path); 3797 HINSTANCE result = NULL; 3798 3799 // only allow library name without path component 3800 assert(strchr(name, '\\') == NULL, "path not allowed"); 3801 assert(strchr(name, ':') == NULL, "path not allowed"); 3802 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) { 3803 jio_snprintf(ebuf, ebuflen, 3804 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name); 3805 return NULL; 3806 } 3807 3808 // search system directory 3809 if ((size = GetSystemDirectory(path, pathLen)) > 0) { 3810 if (size >= pathLen) { 3811 return NULL; // truncated 3812 } 3813 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3814 return NULL; // truncated 3815 } 3816 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3817 return result; 3818 } 3819 } 3820 3821 // try Windows directory 3822 if ((size = GetWindowsDirectory(path, pathLen)) > 0) { 3823 if (size >= pathLen) { 3824 return NULL; // truncated 3825 } 3826 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3827 return NULL; // truncated 3828 } 3829 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3830 return result; 3831 } 3832 } 3833 3834 jio_snprintf(ebuf, ebuflen, 3835 "os::win32::load_windows_dll() cannot load %s from system directories.", name); 3836 return NULL; 3837 } 3838 3839 #define EXIT_TIMEOUT 300000 /* 5 minutes */ 3840 3841 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) { 3842 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect); 3843 return TRUE; 3844 } 3845 3846 int os::win32::exit_process_or_thread(Ept what, int exit_code) { 3847 // Basic approach: 3848 // - Each exiting thread registers its intent to exit and then does so. 3849 // - A thread trying to terminate the process must wait for all 3850 // threads currently exiting to complete their exit. 3851 3852 if (os::win32::has_exit_bug()) { 3853 // The array holds handles of the threads that have started exiting by calling 3854 // _endthreadex(). 3855 // Should be large enough to avoid blocking the exiting thread due to lack of 3856 // a free slot. 3857 static HANDLE handles[MAXIMUM_WAIT_OBJECTS]; 3858 static int handle_count = 0; 3859 3860 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT; 3861 static CRITICAL_SECTION crit_sect; 3862 static volatile jint process_exiting = 0; 3863 int i, j; 3864 DWORD res; 3865 HANDLE hproc, hthr; 3866 3867 // The first thread that reached this point, initializes the critical section. 3868 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) { 3869 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__); 3870 } else if (OrderAccess::load_acquire(&process_exiting) == 0) { 3871 EnterCriticalSection(&crit_sect); 3872 3873 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) { 3874 // Remove from the array those handles of the threads that have completed exiting. 3875 for (i = 0, j = 0; i < handle_count; ++i) { 3876 res = WaitForSingleObject(handles[i], 0 /* don't wait */); 3877 if (res == WAIT_TIMEOUT) { 3878 handles[j++] = handles[i]; 3879 } else { 3880 if (res == WAIT_FAILED) { 3881 warning("WaitForSingleObject failed (%u) in %s: %d\n", 3882 GetLastError(), __FILE__, __LINE__); 3883 } 3884 // Don't keep the handle, if we failed waiting for it. 3885 CloseHandle(handles[i]); 3886 } 3887 } 3888 3889 // If there's no free slot in the array of the kept handles, we'll have to 3890 // wait until at least one thread completes exiting. 3891 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) { 3892 // Raise the priority of the oldest exiting thread to increase its chances 3893 // to complete sooner. 3894 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL); 3895 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT); 3896 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) { 3897 i = (res - WAIT_OBJECT_0); 3898 handle_count = MAXIMUM_WAIT_OBJECTS - 1; 3899 for (; i < handle_count; ++i) { 3900 handles[i] = handles[i + 1]; 3901 } 3902 } else { 3903 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3904 (res == WAIT_FAILED ? "failed" : "timed out"), 3905 GetLastError(), __FILE__, __LINE__); 3906 // Don't keep handles, if we failed waiting for them. 3907 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) { 3908 CloseHandle(handles[i]); 3909 } 3910 handle_count = 0; 3911 } 3912 } 3913 3914 // Store a duplicate of the current thread handle in the array of handles. 3915 hproc = GetCurrentProcess(); 3916 hthr = GetCurrentThread(); 3917 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count], 3918 0, FALSE, DUPLICATE_SAME_ACCESS)) { 3919 warning("DuplicateHandle failed (%u) in %s: %d\n", 3920 GetLastError(), __FILE__, __LINE__); 3921 } else { 3922 ++handle_count; 3923 } 3924 3925 // The current exiting thread has stored its handle in the array, and now 3926 // should leave the critical section before calling _endthreadex(). 3927 3928 } else if (what != EPT_THREAD) { 3929 if (handle_count > 0) { 3930 // Before ending the process, make sure all the threads that had called 3931 // _endthreadex() completed. 3932 3933 // Set the priority level of the current thread to the same value as 3934 // the priority level of exiting threads. 3935 // This is to ensure it will be given a fair chance to execute if 3936 // the timeout expires. 3937 hthr = GetCurrentThread(); 3938 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL); 3939 for (i = 0; i < handle_count; ++i) { 3940 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL); 3941 } 3942 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT); 3943 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) { 3944 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3945 (res == WAIT_FAILED ? "failed" : "timed out"), 3946 GetLastError(), __FILE__, __LINE__); 3947 } 3948 for (i = 0; i < handle_count; ++i) { 3949 CloseHandle(handles[i]); 3950 } 3951 handle_count = 0; 3952 } 3953 3954 OrderAccess::release_store(&process_exiting, 1); 3955 } 3956 3957 LeaveCriticalSection(&crit_sect); 3958 } 3959 3960 if (what == EPT_THREAD) { 3961 while (OrderAccess::load_acquire(&process_exiting) != 0) { 3962 // Some other thread is about to call exit(), so we 3963 // don't let the current thread proceed to _endthreadex() 3964 SuspendThread(GetCurrentThread()); 3965 // Avoid busy-wait loop, if SuspendThread() failed. 3966 Sleep(EXIT_TIMEOUT); 3967 } 3968 } 3969 } 3970 3971 // We are here if either 3972 // - there's no 'race at exit' bug on this OS release; 3973 // - initialization of the critical section failed (unlikely); 3974 // - the current thread has stored its handle and left the critical section; 3975 // - the process-exiting thread has raised the flag and left the critical section. 3976 if (what == EPT_THREAD) { 3977 _endthreadex((unsigned)exit_code); 3978 } else if (what == EPT_PROCESS) { 3979 ::exit(exit_code); 3980 } else { 3981 _exit(exit_code); 3982 } 3983 3984 // Should not reach here 3985 return exit_code; 3986 } 3987 3988 #undef EXIT_TIMEOUT 3989 3990 void os::win32::setmode_streams() { 3991 _setmode(_fileno(stdin), _O_BINARY); 3992 _setmode(_fileno(stdout), _O_BINARY); 3993 _setmode(_fileno(stderr), _O_BINARY); 3994 } 3995 3996 3997 bool os::is_debugger_attached() { 3998 return IsDebuggerPresent() ? true : false; 3999 } 4000 4001 4002 void os::wait_for_keypress_at_exit(void) { 4003 if (PauseAtExit) { 4004 fprintf(stderr, "Press any key to continue...\n"); 4005 fgetc(stdin); 4006 } 4007 } 4008 4009 4010 int os::message_box(const char* title, const char* message) { 4011 int result = MessageBox(NULL, message, title, 4012 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 4013 return result == IDYES; 4014 } 4015 4016 #ifndef PRODUCT 4017 #ifndef _WIN64 4018 // Helpers to check whether NX protection is enabled 4019 int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 4020 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 4021 pex->ExceptionRecord->NumberParameters > 0 && 4022 pex->ExceptionRecord->ExceptionInformation[0] == 4023 EXCEPTION_INFO_EXEC_VIOLATION) { 4024 return EXCEPTION_EXECUTE_HANDLER; 4025 } 4026 return EXCEPTION_CONTINUE_SEARCH; 4027 } 4028 4029 void nx_check_protection() { 4030 // If NX is enabled we'll get an exception calling into code on the stack 4031 char code[] = { (char)0xC3 }; // ret 4032 void *code_ptr = (void *)code; 4033 __try { 4034 __asm call code_ptr 4035 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 4036 tty->print_raw_cr("NX protection detected."); 4037 } 4038 } 4039 #endif // _WIN64 4040 #endif // PRODUCT 4041 4042 // this is called _before_ the global arguments have been parsed 4043 void os::init(void) { 4044 _initial_pid = _getpid(); 4045 4046 init_random(1234567); 4047 4048 win32::initialize_system_info(); 4049 win32::setmode_streams(); 4050 init_page_sizes((size_t) win32::vm_page_size()); 4051 4052 // This may be overridden later when argument processing is done. 4053 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, 4054 os::win32::is_windows_2003()); 4055 4056 // Initialize main_process and main_thread 4057 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 4058 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 4059 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 4060 fatal("DuplicateHandle failed\n"); 4061 } 4062 main_thread_id = (int) GetCurrentThreadId(); 4063 4064 // initialize fast thread access - only used for 32-bit 4065 win32::initialize_thread_ptr_offset(); 4066 } 4067 4068 // To install functions for atexit processing 4069 extern "C" { 4070 static void perfMemory_exit_helper() { 4071 perfMemory_exit(); 4072 } 4073 } 4074 4075 static jint initSock(); 4076 4077 // this is called _after_ the global arguments have been parsed 4078 jint os::init_2(void) { 4079 // Allocate a single page and mark it as readable for safepoint polling 4080 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 4081 guarantee(polling_page != NULL, "Reserve Failed for polling page"); 4082 4083 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 4084 guarantee(return_page != NULL, "Commit Failed for polling page"); 4085 4086 os::set_polling_page(polling_page); 4087 4088 #ifndef PRODUCT 4089 if (Verbose && PrintMiscellaneous) { 4090 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", 4091 (intptr_t)polling_page); 4092 } 4093 #endif 4094 4095 if (!UseMembar) { 4096 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE); 4097 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 4098 4099 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE); 4100 guarantee(return_page != NULL, "Commit Failed for memory serialize page"); 4101 4102 os::set_memory_serialize_page(mem_serialize_page); 4103 4104 #ifndef PRODUCT 4105 if (Verbose && PrintMiscellaneous) { 4106 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", 4107 (intptr_t)mem_serialize_page); 4108 } 4109 #endif 4110 } 4111 4112 // Setup Windows Exceptions 4113 4114 // for debugging float code generation bugs 4115 if (ForceFloatExceptions) { 4116 #ifndef _WIN64 4117 static long fp_control_word = 0; 4118 __asm { fstcw fp_control_word } 4119 // see Intel PPro Manual, Vol. 2, p 7-16 4120 const long precision = 0x20; 4121 const long underflow = 0x10; 4122 const long overflow = 0x08; 4123 const long zero_div = 0x04; 4124 const long denorm = 0x02; 4125 const long invalid = 0x01; 4126 fp_control_word |= invalid; 4127 __asm { fldcw fp_control_word } 4128 #endif 4129 } 4130 4131 // If stack_commit_size is 0, windows will reserve the default size, 4132 // but only commit a small portion of it. 4133 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 4134 size_t default_reserve_size = os::win32::default_stack_size(); 4135 size_t actual_reserve_size = stack_commit_size; 4136 if (stack_commit_size < default_reserve_size) { 4137 // If stack_commit_size == 0, we want this too 4138 actual_reserve_size = default_reserve_size; 4139 } 4140 4141 // Check minimum allowable stack size for thread creation and to initialize 4142 // the java system classes, including StackOverflowError - depends on page 4143 // size. Add a page for compiler2 recursion in main thread. 4144 // Add in 2*BytesPerWord times page size to account for VM stack during 4145 // class initialization depending on 32 or 64 bit VM. 4146 size_t min_stack_allowed = 4147 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 4148 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size(); 4149 if (actual_reserve_size < min_stack_allowed) { 4150 tty->print_cr("\nThe stack size specified is too small, " 4151 "Specify at least %dk", 4152 min_stack_allowed / K); 4153 return JNI_ERR; 4154 } 4155 4156 JavaThread::set_stack_size_at_create(stack_commit_size); 4157 4158 // Calculate theoretical max. size of Threads to guard gainst artifical 4159 // out-of-memory situations, where all available address-space has been 4160 // reserved by thread stacks. 4161 assert(actual_reserve_size != 0, "Must have a stack"); 4162 4163 // Calculate the thread limit when we should start doing Virtual Memory 4164 // banging. Currently when the threads will have used all but 200Mb of space. 4165 // 4166 // TODO: consider performing a similar calculation for commit size instead 4167 // as reserve size, since on a 64-bit platform we'll run into that more 4168 // often than running out of virtual memory space. We can use the 4169 // lower value of the two calculations as the os_thread_limit. 4170 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 4171 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 4172 4173 // at exit methods are called in the reverse order of their registration. 4174 // there is no limit to the number of functions registered. atexit does 4175 // not set errno. 4176 4177 if (PerfAllowAtExitRegistration) { 4178 // only register atexit functions if PerfAllowAtExitRegistration is set. 4179 // atexit functions can be delayed until process exit time, which 4180 // can be problematic for embedded VM situations. Embedded VMs should 4181 // call DestroyJavaVM() to assure that VM resources are released. 4182 4183 // note: perfMemory_exit_helper atexit function may be removed in 4184 // the future if the appropriate cleanup code can be added to the 4185 // VM_Exit VMOperation's doit method. 4186 if (atexit(perfMemory_exit_helper) != 0) { 4187 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 4188 } 4189 } 4190 4191 #ifndef _WIN64 4192 // Print something if NX is enabled (win32 on AMD64) 4193 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 4194 #endif 4195 4196 // initialize thread priority policy 4197 prio_init(); 4198 4199 if (UseNUMA && !ForceNUMA) { 4200 UseNUMA = false; // We don't fully support this yet 4201 } 4202 4203 if (UseNUMAInterleaving) { 4204 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag 4205 bool success = numa_interleaving_init(); 4206 if (!success) UseNUMAInterleaving = false; 4207 } 4208 4209 if (initSock() != JNI_OK) { 4210 return JNI_ERR; 4211 } 4212 4213 return JNI_OK; 4214 } 4215 4216 // Mark the polling page as unreadable 4217 void os::make_polling_page_unreadable(void) { 4218 DWORD old_status; 4219 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4220 PAGE_NOACCESS, &old_status)) { 4221 fatal("Could not disable polling page"); 4222 } 4223 } 4224 4225 // Mark the polling page as readable 4226 void os::make_polling_page_readable(void) { 4227 DWORD old_status; 4228 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4229 PAGE_READONLY, &old_status)) { 4230 fatal("Could not enable polling page"); 4231 } 4232 } 4233 4234 4235 int os::stat(const char *path, struct stat *sbuf) { 4236 char pathbuf[MAX_PATH]; 4237 if (strlen(path) > MAX_PATH - 1) { 4238 errno = ENAMETOOLONG; 4239 return -1; 4240 } 4241 os::native_path(strcpy(pathbuf, path)); 4242 int ret = ::stat(pathbuf, sbuf); 4243 if (sbuf != NULL && UseUTCFileTimestamp) { 4244 // Fix for 6539723. st_mtime returned from stat() is dependent on 4245 // the system timezone and so can return different values for the 4246 // same file if/when daylight savings time changes. This adjustment 4247 // makes sure the same timestamp is returned regardless of the TZ. 4248 // 4249 // See: 4250 // http://msdn.microsoft.com/library/ 4251 // default.asp?url=/library/en-us/sysinfo/base/ 4252 // time_zone_information_str.asp 4253 // and 4254 // http://msdn.microsoft.com/library/default.asp?url= 4255 // /library/en-us/sysinfo/base/settimezoneinformation.asp 4256 // 4257 // NOTE: there is a insidious bug here: If the timezone is changed 4258 // after the call to stat() but before 'GetTimeZoneInformation()', then 4259 // the adjustment we do here will be wrong and we'll return the wrong 4260 // value (which will likely end up creating an invalid class data 4261 // archive). Absent a better API for this, or some time zone locking 4262 // mechanism, we'll have to live with this risk. 4263 TIME_ZONE_INFORMATION tz; 4264 DWORD tzid = GetTimeZoneInformation(&tz); 4265 int daylightBias = 4266 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 4267 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 4268 } 4269 return ret; 4270 } 4271 4272 4273 #define FT2INT64(ft) \ 4274 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 4275 4276 4277 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4278 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4279 // of a thread. 4280 // 4281 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4282 // the fast estimate available on the platform. 4283 4284 // current_thread_cpu_time() is not optimized for Windows yet 4285 jlong os::current_thread_cpu_time() { 4286 // return user + sys since the cost is the same 4287 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 4288 } 4289 4290 jlong os::thread_cpu_time(Thread* thread) { 4291 // consistent with what current_thread_cpu_time() returns. 4292 return os::thread_cpu_time(thread, true /* user+sys */); 4293 } 4294 4295 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4296 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4297 } 4298 4299 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 4300 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 4301 // If this function changes, os::is_thread_cpu_time_supported() should too 4302 if (os::win32::is_nt()) { 4303 FILETIME CreationTime; 4304 FILETIME ExitTime; 4305 FILETIME KernelTime; 4306 FILETIME UserTime; 4307 4308 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime, 4309 &ExitTime, &KernelTime, &UserTime) == 0) { 4310 return -1; 4311 } else if (user_sys_cpu_time) { 4312 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 4313 } else { 4314 return FT2INT64(UserTime) * 100; 4315 } 4316 } else { 4317 return (jlong) timeGetTime() * 1000000; 4318 } 4319 } 4320 4321 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4322 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4323 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4324 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4325 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4326 } 4327 4328 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4329 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4330 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4331 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4332 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4333 } 4334 4335 bool os::is_thread_cpu_time_supported() { 4336 // see os::thread_cpu_time 4337 if (os::win32::is_nt()) { 4338 FILETIME CreationTime; 4339 FILETIME ExitTime; 4340 FILETIME KernelTime; 4341 FILETIME UserTime; 4342 4343 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime, 4344 &KernelTime, &UserTime) == 0) { 4345 return false; 4346 } else { 4347 return true; 4348 } 4349 } else { 4350 return false; 4351 } 4352 } 4353 4354 // Windows does't provide a loadavg primitive so this is stubbed out for now. 4355 // It does have primitives (PDH API) to get CPU usage and run queue length. 4356 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 4357 // If we wanted to implement loadavg on Windows, we have a few options: 4358 // 4359 // a) Query CPU usage and run queue length and "fake" an answer by 4360 // returning the CPU usage if it's under 100%, and the run queue 4361 // length otherwise. It turns out that querying is pretty slow 4362 // on Windows, on the order of 200 microseconds on a fast machine. 4363 // Note that on the Windows the CPU usage value is the % usage 4364 // since the last time the API was called (and the first call 4365 // returns 100%), so we'd have to deal with that as well. 4366 // 4367 // b) Sample the "fake" answer using a sampling thread and store 4368 // the answer in a global variable. The call to loadavg would 4369 // just return the value of the global, avoiding the slow query. 4370 // 4371 // c) Sample a better answer using exponential decay to smooth the 4372 // value. This is basically the algorithm used by UNIX kernels. 4373 // 4374 // Note that sampling thread starvation could affect both (b) and (c). 4375 int os::loadavg(double loadavg[], int nelem) { 4376 return -1; 4377 } 4378 4379 4380 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 4381 bool os::dont_yield() { 4382 return DontYieldALot; 4383 } 4384 4385 // This method is a slightly reworked copy of JDK's sysOpen 4386 // from src/windows/hpi/src/sys_api_md.c 4387 4388 int os::open(const char *path, int oflag, int mode) { 4389 char pathbuf[MAX_PATH]; 4390 4391 if (strlen(path) > MAX_PATH - 1) { 4392 errno = ENAMETOOLONG; 4393 return -1; 4394 } 4395 os::native_path(strcpy(pathbuf, path)); 4396 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 4397 } 4398 4399 FILE* os::open(int fd, const char* mode) { 4400 return ::_fdopen(fd, mode); 4401 } 4402 4403 // Is a (classpath) directory empty? 4404 bool os::dir_is_empty(const char* path) { 4405 WIN32_FIND_DATA fd; 4406 HANDLE f = FindFirstFile(path, &fd); 4407 if (f == INVALID_HANDLE_VALUE) { 4408 return true; 4409 } 4410 FindClose(f); 4411 return false; 4412 } 4413 4414 // create binary file, rewriting existing file if required 4415 int os::create_binary_file(const char* path, bool rewrite_existing) { 4416 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 4417 if (!rewrite_existing) { 4418 oflags |= _O_EXCL; 4419 } 4420 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 4421 } 4422 4423 // return current position of file pointer 4424 jlong os::current_file_offset(int fd) { 4425 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 4426 } 4427 4428 // move file pointer to the specified offset 4429 jlong os::seek_to_file_offset(int fd, jlong offset) { 4430 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 4431 } 4432 4433 4434 jlong os::lseek(int fd, jlong offset, int whence) { 4435 return (jlong) ::_lseeki64(fd, offset, whence); 4436 } 4437 4438 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 4439 OVERLAPPED ov; 4440 DWORD nread; 4441 BOOL result; 4442 4443 ZeroMemory(&ov, sizeof(ov)); 4444 ov.Offset = (DWORD)offset; 4445 ov.OffsetHigh = (DWORD)(offset >> 32); 4446 4447 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4448 4449 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov); 4450 4451 return result ? nread : 0; 4452 } 4453 4454 4455 // This method is a slightly reworked copy of JDK's sysNativePath 4456 // from src/windows/hpi/src/path_md.c 4457 4458 // Convert a pathname to native format. On win32, this involves forcing all 4459 // separators to be '\\' rather than '/' (both are legal inputs, but Win95 4460 // sometimes rejects '/') and removing redundant separators. The input path is 4461 // assumed to have been converted into the character encoding used by the local 4462 // system. Because this might be a double-byte encoding, care is taken to 4463 // treat double-byte lead characters correctly. 4464 // 4465 // This procedure modifies the given path in place, as the result is never 4466 // longer than the original. There is no error return; this operation always 4467 // succeeds. 4468 char * os::native_path(char *path) { 4469 char *src = path, *dst = path, *end = path; 4470 char *colon = NULL; // If a drive specifier is found, this will 4471 // point to the colon following the drive letter 4472 4473 // Assumption: '/', '\\', ':', and drive letters are never lead bytes 4474 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\')) 4475 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte"); 4476 4477 // Check for leading separators 4478 #define isfilesep(c) ((c) == '/' || (c) == '\\') 4479 while (isfilesep(*src)) { 4480 src++; 4481 } 4482 4483 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 4484 // Remove leading separators if followed by drive specifier. This 4485 // hack is necessary to support file URLs containing drive 4486 // specifiers (e.g., "file://c:/path"). As a side effect, 4487 // "/c:/path" can be used as an alternative to "c:/path". 4488 *dst++ = *src++; 4489 colon = dst; 4490 *dst++ = ':'; 4491 src++; 4492 } else { 4493 src = path; 4494 if (isfilesep(src[0]) && isfilesep(src[1])) { 4495 // UNC pathname: Retain first separator; leave src pointed at 4496 // second separator so that further separators will be collapsed 4497 // into the second separator. The result will be a pathname 4498 // beginning with "\\\\" followed (most likely) by a host name. 4499 src = dst = path + 1; 4500 path[0] = '\\'; // Force first separator to '\\' 4501 } 4502 } 4503 4504 end = dst; 4505 4506 // Remove redundant separators from remainder of path, forcing all 4507 // separators to be '\\' rather than '/'. Also, single byte space 4508 // characters are removed from the end of the path because those 4509 // are not legal ending characters on this operating system. 4510 // 4511 while (*src != '\0') { 4512 if (isfilesep(*src)) { 4513 *dst++ = '\\'; src++; 4514 while (isfilesep(*src)) src++; 4515 if (*src == '\0') { 4516 // Check for trailing separator 4517 end = dst; 4518 if (colon == dst - 2) break; // "z:\\" 4519 if (dst == path + 1) break; // "\\" 4520 if (dst == path + 2 && isfilesep(path[0])) { 4521 // "\\\\" is not collapsed to "\\" because "\\\\" marks the 4522 // beginning of a UNC pathname. Even though it is not, by 4523 // itself, a valid UNC pathname, we leave it as is in order 4524 // to be consistent with the path canonicalizer as well 4525 // as the win32 APIs, which treat this case as an invalid 4526 // UNC pathname rather than as an alias for the root 4527 // directory of the current drive. 4528 break; 4529 } 4530 end = --dst; // Path does not denote a root directory, so 4531 // remove trailing separator 4532 break; 4533 } 4534 end = dst; 4535 } else { 4536 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character 4537 *dst++ = *src++; 4538 if (*src) *dst++ = *src++; 4539 end = dst; 4540 } else { // Copy a single-byte character 4541 char c = *src++; 4542 *dst++ = c; 4543 // Space is not a legal ending character 4544 if (c != ' ') end = dst; 4545 } 4546 } 4547 } 4548 4549 *end = '\0'; 4550 4551 // For "z:", add "." to work around a bug in the C runtime library 4552 if (colon == dst - 1) { 4553 path[2] = '.'; 4554 path[3] = '\0'; 4555 } 4556 4557 return path; 4558 } 4559 4560 // This code is a copy of JDK's sysSetLength 4561 // from src/windows/hpi/src/sys_api_md.c 4562 4563 int os::ftruncate(int fd, jlong length) { 4564 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4565 long high = (long)(length >> 32); 4566 DWORD ret; 4567 4568 if (h == (HANDLE)(-1)) { 4569 return -1; 4570 } 4571 4572 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 4573 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 4574 return -1; 4575 } 4576 4577 if (::SetEndOfFile(h) == FALSE) { 4578 return -1; 4579 } 4580 4581 return 0; 4582 } 4583 4584 4585 // This code is a copy of JDK's sysSync 4586 // from src/windows/hpi/src/sys_api_md.c 4587 // except for the legacy workaround for a bug in Win 98 4588 4589 int os::fsync(int fd) { 4590 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 4591 4592 if ((!::FlushFileBuffers(handle)) && 4593 (GetLastError() != ERROR_ACCESS_DENIED)) { 4594 // from winerror.h 4595 return -1; 4596 } 4597 return 0; 4598 } 4599 4600 static int nonSeekAvailable(int, long *); 4601 static int stdinAvailable(int, long *); 4602 4603 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR) 4604 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO) 4605 4606 // This code is a copy of JDK's sysAvailable 4607 // from src/windows/hpi/src/sys_api_md.c 4608 4609 int os::available(int fd, jlong *bytes) { 4610 jlong cur, end; 4611 struct _stati64 stbuf64; 4612 4613 if (::_fstati64(fd, &stbuf64) >= 0) { 4614 int mode = stbuf64.st_mode; 4615 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 4616 int ret; 4617 long lpbytes; 4618 if (fd == 0) { 4619 ret = stdinAvailable(fd, &lpbytes); 4620 } else { 4621 ret = nonSeekAvailable(fd, &lpbytes); 4622 } 4623 (*bytes) = (jlong)(lpbytes); 4624 return ret; 4625 } 4626 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 4627 return FALSE; 4628 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 4629 return FALSE; 4630 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 4631 return FALSE; 4632 } 4633 *bytes = end - cur; 4634 return TRUE; 4635 } else { 4636 return FALSE; 4637 } 4638 } 4639 4640 // This code is a copy of JDK's nonSeekAvailable 4641 // from src/windows/hpi/src/sys_api_md.c 4642 4643 static int nonSeekAvailable(int fd, long *pbytes) { 4644 // This is used for available on non-seekable devices 4645 // (like both named and anonymous pipes, such as pipes 4646 // connected to an exec'd process). 4647 // Standard Input is a special case. 4648 HANDLE han; 4649 4650 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 4651 return FALSE; 4652 } 4653 4654 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 4655 // PeekNamedPipe fails when at EOF. In that case we 4656 // simply make *pbytes = 0 which is consistent with the 4657 // behavior we get on Solaris when an fd is at EOF. 4658 // The only alternative is to raise an Exception, 4659 // which isn't really warranted. 4660 // 4661 if (::GetLastError() != ERROR_BROKEN_PIPE) { 4662 return FALSE; 4663 } 4664 *pbytes = 0; 4665 } 4666 return TRUE; 4667 } 4668 4669 #define MAX_INPUT_EVENTS 2000 4670 4671 // This code is a copy of JDK's stdinAvailable 4672 // from src/windows/hpi/src/sys_api_md.c 4673 4674 static int stdinAvailable(int fd, long *pbytes) { 4675 HANDLE han; 4676 DWORD numEventsRead = 0; // Number of events read from buffer 4677 DWORD numEvents = 0; // Number of events in buffer 4678 DWORD i = 0; // Loop index 4679 DWORD curLength = 0; // Position marker 4680 DWORD actualLength = 0; // Number of bytes readable 4681 BOOL error = FALSE; // Error holder 4682 INPUT_RECORD *lpBuffer; // Pointer to records of input events 4683 4684 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4685 return FALSE; 4686 } 4687 4688 // Construct an array of input records in the console buffer 4689 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4690 if (error == 0) { 4691 return nonSeekAvailable(fd, pbytes); 4692 } 4693 4694 // lpBuffer must fit into 64K or else PeekConsoleInput fails 4695 if (numEvents > MAX_INPUT_EVENTS) { 4696 numEvents = MAX_INPUT_EVENTS; 4697 } 4698 4699 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal); 4700 if (lpBuffer == NULL) { 4701 return FALSE; 4702 } 4703 4704 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4705 if (error == 0) { 4706 os::free(lpBuffer); 4707 return FALSE; 4708 } 4709 4710 // Examine input records for the number of bytes available 4711 for (i=0; i<numEvents; i++) { 4712 if (lpBuffer[i].EventType == KEY_EVENT) { 4713 4714 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4715 &(lpBuffer[i].Event); 4716 if (keyRecord->bKeyDown == TRUE) { 4717 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4718 curLength++; 4719 if (*keyPressed == '\r') { 4720 actualLength = curLength; 4721 } 4722 } 4723 } 4724 } 4725 4726 if (lpBuffer != NULL) { 4727 os::free(lpBuffer); 4728 } 4729 4730 *pbytes = (long) actualLength; 4731 return TRUE; 4732 } 4733 4734 // Map a block of memory. 4735 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4736 char *addr, size_t bytes, bool read_only, 4737 bool allow_exec) { 4738 HANDLE hFile; 4739 char* base; 4740 4741 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4742 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4743 if (hFile == NULL) { 4744 if (PrintMiscellaneous && Verbose) { 4745 DWORD err = GetLastError(); 4746 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err); 4747 } 4748 return NULL; 4749 } 4750 4751 if (allow_exec) { 4752 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4753 // unless it comes from a PE image (which the shared archive is not.) 4754 // Even VirtualProtect refuses to give execute access to mapped memory 4755 // that was not previously executable. 4756 // 4757 // Instead, stick the executable region in anonymous memory. Yuck. 4758 // Penalty is that ~4 pages will not be shareable - in the future 4759 // we might consider DLLizing the shared archive with a proper PE 4760 // header so that mapping executable + sharing is possible. 4761 4762 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4763 PAGE_READWRITE); 4764 if (base == NULL) { 4765 if (PrintMiscellaneous && Verbose) { 4766 DWORD err = GetLastError(); 4767 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 4768 } 4769 CloseHandle(hFile); 4770 return NULL; 4771 } 4772 4773 DWORD bytes_read; 4774 OVERLAPPED overlapped; 4775 overlapped.Offset = (DWORD)file_offset; 4776 overlapped.OffsetHigh = 0; 4777 overlapped.hEvent = NULL; 4778 // ReadFile guarantees that if the return value is true, the requested 4779 // number of bytes were read before returning. 4780 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 4781 if (!res) { 4782 if (PrintMiscellaneous && Verbose) { 4783 DWORD err = GetLastError(); 4784 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 4785 } 4786 release_memory(base, bytes); 4787 CloseHandle(hFile); 4788 return NULL; 4789 } 4790 } else { 4791 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 4792 NULL /* file_name */); 4793 if (hMap == NULL) { 4794 if (PrintMiscellaneous && Verbose) { 4795 DWORD err = GetLastError(); 4796 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err); 4797 } 4798 CloseHandle(hFile); 4799 return NULL; 4800 } 4801 4802 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 4803 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 4804 (DWORD)bytes, addr); 4805 if (base == NULL) { 4806 if (PrintMiscellaneous && Verbose) { 4807 DWORD err = GetLastError(); 4808 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 4809 } 4810 CloseHandle(hMap); 4811 CloseHandle(hFile); 4812 return NULL; 4813 } 4814 4815 if (CloseHandle(hMap) == 0) { 4816 if (PrintMiscellaneous && Verbose) { 4817 DWORD err = GetLastError(); 4818 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 4819 } 4820 CloseHandle(hFile); 4821 return base; 4822 } 4823 } 4824 4825 if (allow_exec) { 4826 DWORD old_protect; 4827 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 4828 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 4829 4830 if (!res) { 4831 if (PrintMiscellaneous && Verbose) { 4832 DWORD err = GetLastError(); 4833 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 4834 } 4835 // Don't consider this a hard error, on IA32 even if the 4836 // VirtualProtect fails, we should still be able to execute 4837 CloseHandle(hFile); 4838 return base; 4839 } 4840 } 4841 4842 if (CloseHandle(hFile) == 0) { 4843 if (PrintMiscellaneous && Verbose) { 4844 DWORD err = GetLastError(); 4845 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 4846 } 4847 return base; 4848 } 4849 4850 return base; 4851 } 4852 4853 4854 // Remap a block of memory. 4855 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4856 char *addr, size_t bytes, bool read_only, 4857 bool allow_exec) { 4858 // This OS does not allow existing memory maps to be remapped so we 4859 // have to unmap the memory before we remap it. 4860 if (!os::unmap_memory(addr, bytes)) { 4861 return NULL; 4862 } 4863 4864 // There is a very small theoretical window between the unmap_memory() 4865 // call above and the map_memory() call below where a thread in native 4866 // code may be able to access an address that is no longer mapped. 4867 4868 return os::map_memory(fd, file_name, file_offset, addr, bytes, 4869 read_only, allow_exec); 4870 } 4871 4872 4873 // Unmap a block of memory. 4874 // Returns true=success, otherwise false. 4875 4876 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4877 MEMORY_BASIC_INFORMATION mem_info; 4878 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) { 4879 if (PrintMiscellaneous && Verbose) { 4880 DWORD err = GetLastError(); 4881 tty->print_cr("VirtualQuery() failed: GetLastError->%ld.", err); 4882 } 4883 return false; 4884 } 4885 4886 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx. 4887 // Instead, executable region was allocated using VirtualAlloc(). See 4888 // pd_map_memory() above. 4889 // 4890 // The following flags should match the 'exec_access' flages used for 4891 // VirtualProtect() in pd_map_memory(). 4892 if (mem_info.Protect == PAGE_EXECUTE_READ || 4893 mem_info.Protect == PAGE_EXECUTE_READWRITE) { 4894 return pd_release_memory(addr, bytes); 4895 } 4896 4897 BOOL result = UnmapViewOfFile(addr); 4898 if (result == 0) { 4899 if (PrintMiscellaneous && Verbose) { 4900 DWORD err = GetLastError(); 4901 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 4902 } 4903 return false; 4904 } 4905 return true; 4906 } 4907 4908 void os::pause() { 4909 char filename[MAX_PATH]; 4910 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4911 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4912 } else { 4913 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4914 } 4915 4916 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4917 if (fd != -1) { 4918 struct stat buf; 4919 ::close(fd); 4920 while (::stat(filename, &buf) == 0) { 4921 Sleep(100); 4922 } 4923 } else { 4924 jio_fprintf(stderr, 4925 "Could not open pause file '%s', continuing immediately.\n", filename); 4926 } 4927 } 4928 4929 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 4930 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 4931 } 4932 4933 // See the caveats for this class in os_windows.hpp 4934 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back 4935 // into this method and returns false. If no OS EXCEPTION was raised, returns 4936 // true. 4937 // The callback is supposed to provide the method that should be protected. 4938 // 4939 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 4940 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); 4941 assert(!WatcherThread::watcher_thread()->has_crash_protection(), 4942 "crash_protection already set?"); 4943 4944 bool success = true; 4945 __try { 4946 WatcherThread::watcher_thread()->set_crash_protection(this); 4947 cb.call(); 4948 } __except(EXCEPTION_EXECUTE_HANDLER) { 4949 // only for protection, nothing to do 4950 success = false; 4951 } 4952 WatcherThread::watcher_thread()->set_crash_protection(NULL); 4953 return success; 4954 } 4955 4956 // An Event wraps a win32 "CreateEvent" kernel handle. 4957 // 4958 // We have a number of choices regarding "CreateEvent" win32 handle leakage: 4959 // 4960 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 4961 // field, and call CloseHandle() on the win32 event handle. Unpark() would 4962 // need to be modified to tolerate finding a NULL (invalid) win32 event handle. 4963 // In addition, an unpark() operation might fetch the handle field, but the 4964 // event could recycle between the fetch and the SetEvent() operation. 4965 // SetEvent() would either fail because the handle was invalid, or inadvertently work, 4966 // as the win32 handle value had been recycled. In an ideal world calling SetEvent() 4967 // on an stale but recycled handle would be harmless, but in practice this might 4968 // confuse other non-Sun code, so it's not a viable approach. 4969 // 4970 // 2: Once a win32 event handle is associated with an Event, it remains associated 4971 // with the Event. The event handle is never closed. This could be construed 4972 // as handle leakage, but only up to the maximum # of threads that have been extant 4973 // at any one time. This shouldn't be an issue, as windows platforms typically 4974 // permit a process to have hundreds of thousands of open handles. 4975 // 4976 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 4977 // and release unused handles. 4978 // 4979 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 4980 // It's not clear, however, that we wouldn't be trading one type of leak for another. 4981 // 4982 // 5. Use an RCU-like mechanism (Read-Copy Update). 4983 // Or perhaps something similar to Maged Michael's "Hazard pointers". 4984 // 4985 // We use (2). 4986 // 4987 // TODO-FIXME: 4988 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 4989 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 4990 // to recover from (or at least detect) the dreaded Windows 841176 bug. 4991 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 4992 // into a single win32 CreateEvent() handle. 4993 // 4994 // Assumption: 4995 // Only one parker can exist on an event, which is why we allocate 4996 // them per-thread. Multiple unparkers can coexist. 4997 // 4998 // _Event transitions in park() 4999 // -1 => -1 : illegal 5000 // 1 => 0 : pass - return immediately 5001 // 0 => -1 : block; then set _Event to 0 before returning 5002 // 5003 // _Event transitions in unpark() 5004 // 0 => 1 : just return 5005 // 1 => 1 : just return 5006 // -1 => either 0 or 1; must signal target thread 5007 // That is, we can safely transition _Event from -1 to either 5008 // 0 or 1. 5009 // 5010 // _Event serves as a restricted-range semaphore. 5011 // -1 : thread is blocked, i.e. there is a waiter 5012 // 0 : neutral: thread is running or ready, 5013 // could have been signaled after a wait started 5014 // 1 : signaled - thread is running or ready 5015 // 5016 // Another possible encoding of _Event would be with 5017 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5018 // 5019 5020 int os::PlatformEvent::park(jlong Millis) { 5021 // Transitions for _Event: 5022 // -1 => -1 : illegal 5023 // 1 => 0 : pass - return immediately 5024 // 0 => -1 : block; then set _Event to 0 before returning 5025 5026 guarantee(_ParkHandle != NULL , "Invariant"); 5027 guarantee(Millis > 0 , "Invariant"); 5028 5029 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 5030 // the initial park() operation. 5031 // Consider: use atomic decrement instead of CAS-loop 5032 5033 int v; 5034 for (;;) { 5035 v = _Event; 5036 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5037 } 5038 guarantee((v == 0) || (v == 1), "invariant"); 5039 if (v != 0) return OS_OK; 5040 5041 // Do this the hard way by blocking ... 5042 // TODO: consider a brief spin here, gated on the success of recent 5043 // spin attempts by this thread. 5044 // 5045 // We decompose long timeouts into series of shorter timed waits. 5046 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 5047 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 5048 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 5049 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 5050 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 5051 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 5052 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 5053 // for the already waited time. This policy does not admit any new outcomes. 5054 // In the future, however, we might want to track the accumulated wait time and 5055 // adjust Millis accordingly if we encounter a spurious wakeup. 5056 5057 const int MAXTIMEOUT = 0x10000000; 5058 DWORD rv = WAIT_TIMEOUT; 5059 while (_Event < 0 && Millis > 0) { 5060 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT) 5061 if (Millis > MAXTIMEOUT) { 5062 prd = MAXTIMEOUT; 5063 } 5064 rv = ::WaitForSingleObject(_ParkHandle, prd); 5065 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed"); 5066 if (rv == WAIT_TIMEOUT) { 5067 Millis -= prd; 5068 } 5069 } 5070 v = _Event; 5071 _Event = 0; 5072 // see comment at end of os::PlatformEvent::park() below: 5073 OrderAccess::fence(); 5074 // If we encounter a nearly simultanous timeout expiry and unpark() 5075 // we return OS_OK indicating we awoke via unpark(). 5076 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 5077 return (v >= 0) ? OS_OK : OS_TIMEOUT; 5078 } 5079 5080 void os::PlatformEvent::park() { 5081 // Transitions for _Event: 5082 // -1 => -1 : illegal 5083 // 1 => 0 : pass - return immediately 5084 // 0 => -1 : block; then set _Event to 0 before returning 5085 5086 guarantee(_ParkHandle != NULL, "Invariant"); 5087 // Invariant: Only the thread associated with the Event/PlatformEvent 5088 // may call park(). 5089 // Consider: use atomic decrement instead of CAS-loop 5090 int v; 5091 for (;;) { 5092 v = _Event; 5093 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5094 } 5095 guarantee((v == 0) || (v == 1), "invariant"); 5096 if (v != 0) return; 5097 5098 // Do this the hard way by blocking ... 5099 // TODO: consider a brief spin here, gated on the success of recent 5100 // spin attempts by this thread. 5101 while (_Event < 0) { 5102 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE); 5103 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed"); 5104 } 5105 5106 // Usually we'll find _Event == 0 at this point, but as 5107 // an optional optimization we clear it, just in case can 5108 // multiple unpark() operations drove _Event up to 1. 5109 _Event = 0; 5110 OrderAccess::fence(); 5111 guarantee(_Event >= 0, "invariant"); 5112 } 5113 5114 void os::PlatformEvent::unpark() { 5115 guarantee(_ParkHandle != NULL, "Invariant"); 5116 5117 // Transitions for _Event: 5118 // 0 => 1 : just return 5119 // 1 => 1 : just return 5120 // -1 => either 0 or 1; must signal target thread 5121 // That is, we can safely transition _Event from -1 to either 5122 // 0 or 1. 5123 // See also: "Semaphores in Plan 9" by Mullender & Cox 5124 // 5125 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5126 // that it will take two back-to-back park() calls for the owning 5127 // thread to block. This has the benefit of forcing a spurious return 5128 // from the first park() call after an unpark() call which will help 5129 // shake out uses of park() and unpark() without condition variables. 5130 5131 if (Atomic::xchg(1, &_Event) >= 0) return; 5132 5133 ::SetEvent(_ParkHandle); 5134 } 5135 5136 5137 // JSR166 5138 // ------------------------------------------------------- 5139 5140 // The Windows implementation of Park is very straightforward: Basic 5141 // operations on Win32 Events turn out to have the right semantics to 5142 // use them directly. We opportunistically resuse the event inherited 5143 // from Monitor. 5144 5145 void Parker::park(bool isAbsolute, jlong time) { 5146 guarantee(_ParkEvent != NULL, "invariant"); 5147 // First, demultiplex/decode time arguments 5148 if (time < 0) { // don't wait 5149 return; 5150 } else if (time == 0 && !isAbsolute) { 5151 time = INFINITE; 5152 } else if (isAbsolute) { 5153 time -= os::javaTimeMillis(); // convert to relative time 5154 if (time <= 0) { // already elapsed 5155 return; 5156 } 5157 } else { // relative 5158 time /= 1000000; // Must coarsen from nanos to millis 5159 if (time == 0) { // Wait for the minimal time unit if zero 5160 time = 1; 5161 } 5162 } 5163 5164 JavaThread* thread = JavaThread::current(); 5165 5166 // Don't wait if interrupted or already triggered 5167 if (Thread::is_interrupted(thread, false) || 5168 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 5169 ResetEvent(_ParkEvent); 5170 return; 5171 } else { 5172 ThreadBlockInVM tbivm(thread); 5173 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5174 thread->set_suspend_equivalent(); 5175 5176 WaitForSingleObject(_ParkEvent, time); 5177 ResetEvent(_ParkEvent); 5178 5179 // If externally suspended while waiting, re-suspend 5180 if (thread->handle_special_suspend_equivalent_condition()) { 5181 thread->java_suspend_self(); 5182 } 5183 } 5184 } 5185 5186 void Parker::unpark() { 5187 guarantee(_ParkEvent != NULL, "invariant"); 5188 SetEvent(_ParkEvent); 5189 } 5190 5191 // Run the specified command in a separate process. Return its exit value, 5192 // or -1 on failure (e.g. can't create a new process). 5193 int os::fork_and_exec(char* cmd) { 5194 STARTUPINFO si; 5195 PROCESS_INFORMATION pi; 5196 5197 memset(&si, 0, sizeof(si)); 5198 si.cb = sizeof(si); 5199 memset(&pi, 0, sizeof(pi)); 5200 BOOL rslt = CreateProcess(NULL, // executable name - use command line 5201 cmd, // command line 5202 NULL, // process security attribute 5203 NULL, // thread security attribute 5204 TRUE, // inherits system handles 5205 0, // no creation flags 5206 NULL, // use parent's environment block 5207 NULL, // use parent's starting directory 5208 &si, // (in) startup information 5209 &pi); // (out) process information 5210 5211 if (rslt) { 5212 // Wait until child process exits. 5213 WaitForSingleObject(pi.hProcess, INFINITE); 5214 5215 DWORD exit_code; 5216 GetExitCodeProcess(pi.hProcess, &exit_code); 5217 5218 // Close process and thread handles. 5219 CloseHandle(pi.hProcess); 5220 CloseHandle(pi.hThread); 5221 5222 return (int)exit_code; 5223 } else { 5224 return -1; 5225 } 5226 } 5227 5228 //-------------------------------------------------------------------------------------------------- 5229 // Non-product code 5230 5231 static int mallocDebugIntervalCounter = 0; 5232 static int mallocDebugCounter = 0; 5233 bool os::check_heap(bool force) { 5234 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 5235 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 5236 // Note: HeapValidate executes two hardware breakpoints when it finds something 5237 // wrong; at these points, eax contains the address of the offending block (I think). 5238 // To get to the exlicit error message(s) below, just continue twice. 5239 HANDLE heap = GetProcessHeap(); 5240 5241 // If we fail to lock the heap, then gflags.exe has been used 5242 // or some other special heap flag has been set that prevents 5243 // locking. We don't try to walk a heap we can't lock. 5244 if (HeapLock(heap) != 0) { 5245 PROCESS_HEAP_ENTRY phe; 5246 phe.lpData = NULL; 5247 while (HeapWalk(heap, &phe) != 0) { 5248 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 5249 !HeapValidate(heap, 0, phe.lpData)) { 5250 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 5251 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 5252 fatal("corrupted C heap"); 5253 } 5254 } 5255 DWORD err = GetLastError(); 5256 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 5257 fatal("heap walk aborted with error %d", err); 5258 } 5259 HeapUnlock(heap); 5260 } 5261 mallocDebugIntervalCounter = 0; 5262 } 5263 return true; 5264 } 5265 5266 5267 bool os::find(address addr, outputStream* st) { 5268 // Nothing yet 5269 return false; 5270 } 5271 5272 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 5273 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 5274 5275 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 5276 JavaThread* thread = JavaThread::current(); 5277 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 5278 address addr = (address) exceptionRecord->ExceptionInformation[1]; 5279 5280 if (os::is_memory_serialize_page(thread, addr)) { 5281 return EXCEPTION_CONTINUE_EXECUTION; 5282 } 5283 } 5284 5285 return EXCEPTION_CONTINUE_SEARCH; 5286 } 5287 5288 // We don't build a headless jre for Windows 5289 bool os::is_headless_jre() { return false; } 5290 5291 static jint initSock() { 5292 WSADATA wsadata; 5293 5294 if (!os::WinSock2Dll::WinSock2Available()) { 5295 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n", 5296 ::GetLastError()); 5297 return JNI_ERR; 5298 } 5299 5300 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) { 5301 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n", 5302 ::GetLastError()); 5303 return JNI_ERR; 5304 } 5305 return JNI_OK; 5306 } 5307 5308 struct hostent* os::get_host_by_name(char* name) { 5309 return (struct hostent*)os::WinSock2Dll::gethostbyname(name); 5310 } 5311 5312 int os::socket_close(int fd) { 5313 return ::closesocket(fd); 5314 } 5315 5316 int os::socket(int domain, int type, int protocol) { 5317 return ::socket(domain, type, protocol); 5318 } 5319 5320 int os::connect(int fd, struct sockaddr* him, socklen_t len) { 5321 return ::connect(fd, him, len); 5322 } 5323 5324 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5325 return ::recv(fd, buf, (int)nBytes, flags); 5326 } 5327 5328 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5329 return ::send(fd, buf, (int)nBytes, flags); 5330 } 5331 5332 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5333 return ::send(fd, buf, (int)nBytes, flags); 5334 } 5335 5336 // WINDOWS CONTEXT Flags for THREAD_SAMPLING 5337 #if defined(IA32) 5338 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS) 5339 #elif defined (AMD64) 5340 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT) 5341 #endif 5342 5343 // returns true if thread could be suspended, 5344 // false otherwise 5345 static bool do_suspend(HANDLE* h) { 5346 if (h != NULL) { 5347 if (SuspendThread(*h) != ~0) { 5348 return true; 5349 } 5350 } 5351 return false; 5352 } 5353 5354 // resume the thread 5355 // calling resume on an active thread is a no-op 5356 static void do_resume(HANDLE* h) { 5357 if (h != NULL) { 5358 ResumeThread(*h); 5359 } 5360 } 5361 5362 // retrieve a suspend/resume context capable handle 5363 // from the tid. Caller validates handle return value. 5364 void get_thread_handle_for_extended_context(HANDLE* h, 5365 OSThread::thread_id_t tid) { 5366 if (h != NULL) { 5367 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid); 5368 } 5369 } 5370 5371 // Thread sampling implementation 5372 // 5373 void os::SuspendedThreadTask::internal_do_task() { 5374 CONTEXT ctxt; 5375 HANDLE h = NULL; 5376 5377 // get context capable handle for thread 5378 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id()); 5379 5380 // sanity 5381 if (h == NULL || h == INVALID_HANDLE_VALUE) { 5382 return; 5383 } 5384 5385 // suspend the thread 5386 if (do_suspend(&h)) { 5387 ctxt.ContextFlags = sampling_context_flags; 5388 // get thread context 5389 GetThreadContext(h, &ctxt); 5390 SuspendedThreadTaskContext context(_thread, &ctxt); 5391 // pass context to Thread Sampling impl 5392 do_task(context); 5393 // resume thread 5394 do_resume(&h); 5395 } 5396 5397 // close handle 5398 CloseHandle(h); 5399 } 5400 5401 5402 // Kernel32 API 5403 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void); 5404 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD); 5405 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG); 5406 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG); 5407 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG); 5408 5409 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL; 5410 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL; 5411 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL; 5412 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL; 5413 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL; 5414 5415 5416 BOOL os::Kernel32Dll::initialized = FALSE; 5417 SIZE_T os::Kernel32Dll::GetLargePageMinimum() { 5418 assert(initialized && _GetLargePageMinimum != NULL, 5419 "GetLargePageMinimumAvailable() not yet called"); 5420 return _GetLargePageMinimum(); 5421 } 5422 5423 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() { 5424 if (!initialized) { 5425 initialize(); 5426 } 5427 return _GetLargePageMinimum != NULL; 5428 } 5429 5430 BOOL os::Kernel32Dll::NumaCallsAvailable() { 5431 if (!initialized) { 5432 initialize(); 5433 } 5434 return _VirtualAllocExNuma != NULL; 5435 } 5436 5437 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, 5438 SIZE_T bytes, DWORD flags, 5439 DWORD prot, DWORD node) { 5440 assert(initialized && _VirtualAllocExNuma != NULL, 5441 "NUMACallsAvailable() not yet called"); 5442 5443 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node); 5444 } 5445 5446 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) { 5447 assert(initialized && _GetNumaHighestNodeNumber != NULL, 5448 "NUMACallsAvailable() not yet called"); 5449 5450 return _GetNumaHighestNodeNumber(ptr_highest_node_number); 5451 } 5452 5453 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, 5454 PULONGLONG proc_mask) { 5455 assert(initialized && _GetNumaNodeProcessorMask != NULL, 5456 "NUMACallsAvailable() not yet called"); 5457 5458 return _GetNumaNodeProcessorMask(node, proc_mask); 5459 } 5460 5461 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip, 5462 ULONG FrameToCapture, 5463 PVOID* BackTrace, 5464 PULONG BackTraceHash) { 5465 if (!initialized) { 5466 initialize(); 5467 } 5468 5469 if (_RtlCaptureStackBackTrace != NULL) { 5470 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture, 5471 BackTrace, BackTraceHash); 5472 } else { 5473 return 0; 5474 } 5475 } 5476 5477 void os::Kernel32Dll::initializeCommon() { 5478 if (!initialized) { 5479 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5480 assert(handle != NULL, "Just check"); 5481 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum"); 5482 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma"); 5483 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber"); 5484 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask"); 5485 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace"); 5486 initialized = TRUE; 5487 } 5488 } 5489 5490 5491 5492 #ifndef JDK6_OR_EARLIER 5493 5494 void os::Kernel32Dll::initialize() { 5495 initializeCommon(); 5496 } 5497 5498 5499 // Kernel32 API 5500 inline BOOL os::Kernel32Dll::SwitchToThread() { 5501 return ::SwitchToThread(); 5502 } 5503 5504 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5505 return true; 5506 } 5507 5508 // Help tools 5509 inline BOOL os::Kernel32Dll::HelpToolsAvailable() { 5510 return true; 5511 } 5512 5513 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5514 DWORD th32ProcessId) { 5515 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5516 } 5517 5518 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot, 5519 LPMODULEENTRY32 lpme) { 5520 return ::Module32First(hSnapshot, lpme); 5521 } 5522 5523 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5524 LPMODULEENTRY32 lpme) { 5525 return ::Module32Next(hSnapshot, lpme); 5526 } 5527 5528 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5529 ::GetNativeSystemInfo(lpSystemInfo); 5530 } 5531 5532 // PSAPI API 5533 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, 5534 HMODULE *lpModule, DWORD cb, 5535 LPDWORD lpcbNeeded) { 5536 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5537 } 5538 5539 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, 5540 HMODULE hModule, 5541 LPTSTR lpFilename, 5542 DWORD nSize) { 5543 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5544 } 5545 5546 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, 5547 HMODULE hModule, 5548 LPMODULEINFO lpmodinfo, 5549 DWORD cb) { 5550 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5551 } 5552 5553 inline BOOL os::PSApiDll::PSApiAvailable() { 5554 return true; 5555 } 5556 5557 5558 // WinSock2 API 5559 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, 5560 LPWSADATA lpWSAData) { 5561 return ::WSAStartup(wVersionRequested, lpWSAData); 5562 } 5563 5564 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5565 return ::gethostbyname(name); 5566 } 5567 5568 inline BOOL os::WinSock2Dll::WinSock2Available() { 5569 return true; 5570 } 5571 5572 // Advapi API 5573 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5574 BOOL DisableAllPrivileges, 5575 PTOKEN_PRIVILEGES NewState, 5576 DWORD BufferLength, 5577 PTOKEN_PRIVILEGES PreviousState, 5578 PDWORD ReturnLength) { 5579 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5580 BufferLength, PreviousState, ReturnLength); 5581 } 5582 5583 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5584 DWORD DesiredAccess, 5585 PHANDLE TokenHandle) { 5586 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5587 } 5588 5589 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5590 LPCTSTR lpName, 5591 PLUID lpLuid) { 5592 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5593 } 5594 5595 inline BOOL os::Advapi32Dll::AdvapiAvailable() { 5596 return true; 5597 } 5598 5599 void* os::get_default_process_handle() { 5600 return (void*)GetModuleHandle(NULL); 5601 } 5602 5603 // Builds a platform dependent Agent_OnLoad_<lib_name> function name 5604 // which is used to find statically linked in agents. 5605 // Additionally for windows, takes into account __stdcall names. 5606 // Parameters: 5607 // sym_name: Symbol in library we are looking for 5608 // lib_name: Name of library to look in, NULL for shared libs. 5609 // is_absolute_path == true if lib_name is absolute path to agent 5610 // such as "C:/a/b/L.dll" 5611 // == false if only the base name of the library is passed in 5612 // such as "L" 5613 char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 5614 bool is_absolute_path) { 5615 char *agent_entry_name; 5616 size_t len; 5617 size_t name_len; 5618 size_t prefix_len = strlen(JNI_LIB_PREFIX); 5619 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 5620 const char *start; 5621 5622 if (lib_name != NULL) { 5623 len = name_len = strlen(lib_name); 5624 if (is_absolute_path) { 5625 // Need to strip path, prefix and suffix 5626 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 5627 lib_name = ++start; 5628 } else { 5629 // Need to check for drive prefix 5630 if ((start = strchr(lib_name, ':')) != NULL) { 5631 lib_name = ++start; 5632 } 5633 } 5634 if (len <= (prefix_len + suffix_len)) { 5635 return NULL; 5636 } 5637 lib_name += prefix_len; 5638 name_len = strlen(lib_name) - suffix_len; 5639 } 5640 } 5641 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 5642 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 5643 if (agent_entry_name == NULL) { 5644 return NULL; 5645 } 5646 if (lib_name != NULL) { 5647 const char *p = strrchr(sym_name, '@'); 5648 if (p != NULL && p != sym_name) { 5649 // sym_name == _Agent_OnLoad@XX 5650 strncpy(agent_entry_name, sym_name, (p - sym_name)); 5651 agent_entry_name[(p-sym_name)] = '\0'; 5652 // agent_entry_name == _Agent_OnLoad 5653 strcat(agent_entry_name, "_"); 5654 strncat(agent_entry_name, lib_name, name_len); 5655 strcat(agent_entry_name, p); 5656 // agent_entry_name == _Agent_OnLoad_lib_name@XX 5657 } else { 5658 strcpy(agent_entry_name, sym_name); 5659 strcat(agent_entry_name, "_"); 5660 strncat(agent_entry_name, lib_name, name_len); 5661 } 5662 } else { 5663 strcpy(agent_entry_name, sym_name); 5664 } 5665 return agent_entry_name; 5666 } 5667 5668 #else 5669 // Kernel32 API 5670 typedef BOOL (WINAPI* SwitchToThread_Fn)(void); 5671 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD); 5672 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32); 5673 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32); 5674 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO); 5675 5676 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL; 5677 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL; 5678 Module32First_Fn os::Kernel32Dll::_Module32First = NULL; 5679 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL; 5680 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL; 5681 5682 void os::Kernel32Dll::initialize() { 5683 if (!initialized) { 5684 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5685 assert(handle != NULL, "Just check"); 5686 5687 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread"); 5688 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn) 5689 ::GetProcAddress(handle, "CreateToolhelp32Snapshot"); 5690 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First"); 5691 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next"); 5692 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo"); 5693 initializeCommon(); // resolve the functions that always need resolving 5694 5695 initialized = TRUE; 5696 } 5697 } 5698 5699 BOOL os::Kernel32Dll::SwitchToThread() { 5700 assert(initialized && _SwitchToThread != NULL, 5701 "SwitchToThreadAvailable() not yet called"); 5702 return _SwitchToThread(); 5703 } 5704 5705 5706 BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5707 if (!initialized) { 5708 initialize(); 5709 } 5710 return _SwitchToThread != NULL; 5711 } 5712 5713 // Help tools 5714 BOOL os::Kernel32Dll::HelpToolsAvailable() { 5715 if (!initialized) { 5716 initialize(); 5717 } 5718 return _CreateToolhelp32Snapshot != NULL && 5719 _Module32First != NULL && 5720 _Module32Next != NULL; 5721 } 5722 5723 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5724 DWORD th32ProcessId) { 5725 assert(initialized && _CreateToolhelp32Snapshot != NULL, 5726 "HelpToolsAvailable() not yet called"); 5727 5728 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5729 } 5730 5731 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5732 assert(initialized && _Module32First != NULL, 5733 "HelpToolsAvailable() not yet called"); 5734 5735 return _Module32First(hSnapshot, lpme); 5736 } 5737 5738 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5739 LPMODULEENTRY32 lpme) { 5740 assert(initialized && _Module32Next != NULL, 5741 "HelpToolsAvailable() not yet called"); 5742 5743 return _Module32Next(hSnapshot, lpme); 5744 } 5745 5746 5747 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() { 5748 if (!initialized) { 5749 initialize(); 5750 } 5751 return _GetNativeSystemInfo != NULL; 5752 } 5753 5754 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5755 assert(initialized && _GetNativeSystemInfo != NULL, 5756 "GetNativeSystemInfoAvailable() not yet called"); 5757 5758 _GetNativeSystemInfo(lpSystemInfo); 5759 } 5760 5761 // PSAPI API 5762 5763 5764 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD); 5765 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD); 5766 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD); 5767 5768 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL; 5769 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL; 5770 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL; 5771 BOOL os::PSApiDll::initialized = FALSE; 5772 5773 void os::PSApiDll::initialize() { 5774 if (!initialized) { 5775 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0); 5776 if (handle != NULL) { 5777 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle, 5778 "EnumProcessModules"); 5779 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle, 5780 "GetModuleFileNameExA"); 5781 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle, 5782 "GetModuleInformation"); 5783 } 5784 initialized = TRUE; 5785 } 5786 } 5787 5788 5789 5790 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, 5791 DWORD cb, LPDWORD lpcbNeeded) { 5792 assert(initialized && _EnumProcessModules != NULL, 5793 "PSApiAvailable() not yet called"); 5794 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5795 } 5796 5797 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, 5798 LPTSTR lpFilename, DWORD nSize) { 5799 assert(initialized && _GetModuleFileNameEx != NULL, 5800 "PSApiAvailable() not yet called"); 5801 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5802 } 5803 5804 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, 5805 LPMODULEINFO lpmodinfo, DWORD cb) { 5806 assert(initialized && _GetModuleInformation != NULL, 5807 "PSApiAvailable() not yet called"); 5808 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5809 } 5810 5811 BOOL os::PSApiDll::PSApiAvailable() { 5812 if (!initialized) { 5813 initialize(); 5814 } 5815 return _EnumProcessModules != NULL && 5816 _GetModuleFileNameEx != NULL && 5817 _GetModuleInformation != NULL; 5818 } 5819 5820 5821 // WinSock2 API 5822 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA); 5823 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...); 5824 5825 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL; 5826 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL; 5827 BOOL os::WinSock2Dll::initialized = FALSE; 5828 5829 void os::WinSock2Dll::initialize() { 5830 if (!initialized) { 5831 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0); 5832 if (handle != NULL) { 5833 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup"); 5834 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname"); 5835 } 5836 initialized = TRUE; 5837 } 5838 } 5839 5840 5841 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) { 5842 assert(initialized && _WSAStartup != NULL, 5843 "WinSock2Available() not yet called"); 5844 return _WSAStartup(wVersionRequested, lpWSAData); 5845 } 5846 5847 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5848 assert(initialized && _gethostbyname != NULL, 5849 "WinSock2Available() not yet called"); 5850 return _gethostbyname(name); 5851 } 5852 5853 BOOL os::WinSock2Dll::WinSock2Available() { 5854 if (!initialized) { 5855 initialize(); 5856 } 5857 return _WSAStartup != NULL && 5858 _gethostbyname != NULL; 5859 } 5860 5861 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 5862 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE); 5863 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID); 5864 5865 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL; 5866 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL; 5867 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL; 5868 BOOL os::Advapi32Dll::initialized = FALSE; 5869 5870 void os::Advapi32Dll::initialize() { 5871 if (!initialized) { 5872 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0); 5873 if (handle != NULL) { 5874 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle, 5875 "AdjustTokenPrivileges"); 5876 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle, 5877 "OpenProcessToken"); 5878 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle, 5879 "LookupPrivilegeValueA"); 5880 } 5881 initialized = TRUE; 5882 } 5883 } 5884 5885 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5886 BOOL DisableAllPrivileges, 5887 PTOKEN_PRIVILEGES NewState, 5888 DWORD BufferLength, 5889 PTOKEN_PRIVILEGES PreviousState, 5890 PDWORD ReturnLength) { 5891 assert(initialized && _AdjustTokenPrivileges != NULL, 5892 "AdvapiAvailable() not yet called"); 5893 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5894 BufferLength, PreviousState, ReturnLength); 5895 } 5896 5897 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5898 DWORD DesiredAccess, 5899 PHANDLE TokenHandle) { 5900 assert(initialized && _OpenProcessToken != NULL, 5901 "AdvapiAvailable() not yet called"); 5902 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5903 } 5904 5905 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5906 LPCTSTR lpName, PLUID lpLuid) { 5907 assert(initialized && _LookupPrivilegeValue != NULL, 5908 "AdvapiAvailable() not yet called"); 5909 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5910 } 5911 5912 BOOL os::Advapi32Dll::AdvapiAvailable() { 5913 if (!initialized) { 5914 initialize(); 5915 } 5916 return _AdjustTokenPrivileges != NULL && 5917 _OpenProcessToken != NULL && 5918 _LookupPrivilegeValue != NULL; 5919 } 5920 5921 #endif 5922 5923 #ifndef PRODUCT 5924 5925 // test the code path in reserve_memory_special() that tries to allocate memory in a single 5926 // contiguous memory block at a particular address. 5927 // The test first tries to find a good approximate address to allocate at by using the same 5928 // method to allocate some memory at any address. The test then tries to allocate memory in 5929 // the vicinity (not directly after it to avoid possible by-chance use of that location) 5930 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of 5931 // the previously allocated memory is available for allocation. The only actual failure 5932 // that is reported is when the test tries to allocate at a particular location but gets a 5933 // different valid one. A NULL return value at this point is not considered an error but may 5934 // be legitimate. 5935 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages. 5936 void TestReserveMemorySpecial_test() { 5937 if (!UseLargePages) { 5938 if (VerboseInternalVMTests) { 5939 gclog_or_tty->print("Skipping test because large pages are disabled"); 5940 } 5941 return; 5942 } 5943 // save current value of globals 5944 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; 5945 bool old_use_numa_interleaving = UseNUMAInterleaving; 5946 5947 // set globals to make sure we hit the correct code path 5948 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; 5949 5950 // do an allocation at an address selected by the OS to get a good one. 5951 const size_t large_allocation_size = os::large_page_size() * 4; 5952 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); 5953 if (result == NULL) { 5954 if (VerboseInternalVMTests) { 5955 gclog_or_tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.", 5956 large_allocation_size); 5957 } 5958 } else { 5959 os::release_memory_special(result, large_allocation_size); 5960 5961 // allocate another page within the recently allocated memory area which seems to be a good location. At least 5962 // we managed to get it once. 5963 const size_t expected_allocation_size = os::large_page_size(); 5964 char* expected_location = result + os::large_page_size(); 5965 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); 5966 if (actual_location == NULL) { 5967 if (VerboseInternalVMTests) { 5968 gclog_or_tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.", 5969 expected_location, large_allocation_size); 5970 } 5971 } else { 5972 // release memory 5973 os::release_memory_special(actual_location, expected_allocation_size); 5974 // only now check, after releasing any memory to avoid any leaks. 5975 assert(actual_location == expected_location, 5976 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead", 5977 expected_location, expected_allocation_size, actual_location); 5978 } 5979 } 5980 5981 // restore globals 5982 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; 5983 UseNUMAInterleaving = old_use_numa_interleaving; 5984 } 5985 #endif // PRODUCT 5986 5987 // Fast current thread access 5988 5989 int os::win32::_thread_ptr_offset = 0; 5990 5991 static void call_wrapper_dummy() {} 5992 5993 // We need to call the os_exception_wrapper once so that it sets 5994 // up the offset from FS of the thread pointer. 5995 void os::win32::initialize_thread_ptr_offset() { 5996 os::os_exception_wrapper((java_call_t)call_wrapper_dummy, 5997 NULL, NULL, NULL, NULL); 5998 }