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