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