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 "services/attachListener.hpp" 67 #include "services/memTracker.hpp" 68 #include "services/runtimeService.hpp" 69 #include "utilities/decoder.hpp" 70 #include "utilities/defaultStream.hpp" 71 #include "utilities/events.hpp" 72 #include "utilities/growableArray.hpp" 73 #include "utilities/vmError.hpp" 74 75 #ifdef _DEBUG 76 #include <crtdbg.h> 77 #endif 78 79 80 #include <windows.h> 81 #include <sys/types.h> 82 #include <sys/stat.h> 83 #include <sys/timeb.h> 84 #include <objidl.h> 85 #include <shlobj.h> 86 87 #include <malloc.h> 88 #include <signal.h> 89 #include <direct.h> 90 #include <errno.h> 91 #include <fcntl.h> 92 #include <io.h> 93 #include <process.h> // For _beginthreadex(), _endthreadex() 94 #include <imagehlp.h> // For os::dll_address_to_function_name 95 // for enumerating dll libraries 96 #include <vdmdbg.h> 97 98 // for timer info max values which include all bits 99 #define ALL_64_BITS CONST64(-1) 100 101 // For DLL loading/load error detection 102 // Values of PE COFF 103 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c 104 #define IMAGE_FILE_SIGNATURE_LENGTH 4 105 106 static HANDLE main_process; 107 static HANDLE main_thread; 108 static int main_thread_id; 109 110 static FILETIME process_creation_time; 111 static FILETIME process_exit_time; 112 static FILETIME process_user_time; 113 static FILETIME process_kernel_time; 114 115 #ifdef _M_IA64 116 #define __CPU__ ia64 117 #elif _M_AMD64 118 #define __CPU__ amd64 119 #else 120 #define __CPU__ i486 121 #endif 122 123 // save DLL module handle, used by GetModuleFileName 124 125 HINSTANCE vm_lib_handle; 126 127 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { 128 switch (reason) { 129 case DLL_PROCESS_ATTACH: 130 vm_lib_handle = hinst; 131 if (ForceTimeHighResolution) { 132 timeBeginPeriod(1L); 133 } 134 break; 135 case DLL_PROCESS_DETACH: 136 if (ForceTimeHighResolution) { 137 timeEndPeriod(1L); 138 } 139 break; 140 default: 141 break; 142 } 143 return true; 144 } 145 146 static inline double fileTimeAsDouble(FILETIME* time) { 147 const double high = (double) ((unsigned int) ~0); 148 const double split = 10000000.0; 149 double result = (time->dwLowDateTime / split) + 150 time->dwHighDateTime * (high/split); 151 return result; 152 } 153 154 // Implementation of os 155 156 bool os::getenv(const char* name, char* buffer, int len) { 157 int result = GetEnvironmentVariable(name, buffer, len); 158 return result > 0 && result < len; 159 } 160 161 bool os::unsetenv(const char* name) { 162 assert(name != NULL, "Null pointer"); 163 return (SetEnvironmentVariable(name, NULL) == TRUE); 164 } 165 166 // No setuid programs under Windows. 167 bool os::have_special_privileges() { 168 return false; 169 } 170 171 172 // This method is a periodic task to check for misbehaving JNI applications 173 // under CheckJNI, we can add any periodic checks here. 174 // For Windows at the moment does nothing 175 void os::run_periodic_checks() { 176 return; 177 } 178 179 // previous UnhandledExceptionFilter, if there is one 180 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL; 181 182 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 183 184 void os::init_system_properties_values() { 185 // sysclasspath, java_home, dll_dir 186 { 187 char *home_path; 188 char *dll_path; 189 char *pslash; 190 char *bin = "\\bin"; 191 char home_dir[MAX_PATH]; 192 193 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) { 194 os::jvm_path(home_dir, sizeof(home_dir)); 195 // Found the full path to jvm.dll. 196 // Now cut the path to <java_home>/jre if we can. 197 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll 198 pslash = strrchr(home_dir, '\\'); 199 if (pslash != NULL) { 200 *pslash = '\0'; // get rid of \{client|server} 201 pslash = strrchr(home_dir, '\\'); 202 if (pslash != NULL) { 203 *pslash = '\0'; // get rid of \bin 204 } 205 } 206 } 207 208 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal); 209 if (home_path == NULL) { 210 return; 211 } 212 strcpy(home_path, home_dir); 213 Arguments::set_java_home(home_path); 214 FREE_C_HEAP_ARRAY(char, home_path); 215 216 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, 217 mtInternal); 218 if (dll_path == NULL) { 219 return; 220 } 221 strcpy(dll_path, home_dir); 222 strcat(dll_path, bin); 223 Arguments::set_dll_dir(dll_path); 224 FREE_C_HEAP_ARRAY(char, dll_path); 225 226 if (!set_boot_path('\\', ';')) { 227 return; 228 } 229 } 230 231 // library_path 232 #define EXT_DIR "\\lib\\ext" 233 #define BIN_DIR "\\bin" 234 #define PACKAGE_DIR "\\Sun\\Java" 235 { 236 // Win32 library search order (See the documentation for LoadLibrary): 237 // 238 // 1. The directory from which application is loaded. 239 // 2. The system wide Java Extensions directory (Java only) 240 // 3. System directory (GetSystemDirectory) 241 // 4. Windows directory (GetWindowsDirectory) 242 // 5. The PATH environment variable 243 // 6. The current directory 244 245 char *library_path; 246 char tmp[MAX_PATH]; 247 char *path_str = ::getenv("PATH"); 248 249 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 250 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal); 251 252 library_path[0] = '\0'; 253 254 GetModuleFileName(NULL, tmp, sizeof(tmp)); 255 *(strrchr(tmp, '\\')) = '\0'; 256 strcat(library_path, tmp); 257 258 GetWindowsDirectory(tmp, sizeof(tmp)); 259 strcat(library_path, ";"); 260 strcat(library_path, tmp); 261 strcat(library_path, PACKAGE_DIR BIN_DIR); 262 263 GetSystemDirectory(tmp, sizeof(tmp)); 264 strcat(library_path, ";"); 265 strcat(library_path, tmp); 266 267 GetWindowsDirectory(tmp, sizeof(tmp)); 268 strcat(library_path, ";"); 269 strcat(library_path, tmp); 270 271 if (path_str) { 272 strcat(library_path, ";"); 273 strcat(library_path, path_str); 274 } 275 276 strcat(library_path, ";."); 277 278 Arguments::set_library_path(library_path); 279 FREE_C_HEAP_ARRAY(char, library_path); 280 } 281 282 // Default extensions directory 283 { 284 char path[MAX_PATH]; 285 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 286 GetWindowsDirectory(path, MAX_PATH); 287 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 288 path, PACKAGE_DIR, EXT_DIR); 289 Arguments::set_ext_dirs(buf); 290 } 291 #undef EXT_DIR 292 #undef BIN_DIR 293 #undef PACKAGE_DIR 294 295 #ifndef _WIN64 296 // set our UnhandledExceptionFilter and save any previous one 297 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception); 298 #endif 299 300 // Done 301 return; 302 } 303 304 void os::breakpoint() { 305 DebugBreak(); 306 } 307 308 // Invoked from the BREAKPOINT Macro 309 extern "C" void breakpoint() { 310 os::breakpoint(); 311 } 312 313 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP. 314 // So far, this method is only used by Native Memory Tracking, which is 315 // only supported on Windows XP or later. 316 // 317 int os::get_native_stack(address* stack, int frames, int toSkip) { 318 #ifdef _NMT_NOINLINE_ 319 toSkip++; 320 #endif 321 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames, 322 (PVOID*)stack, NULL); 323 for (int index = captured; index < frames; index ++) { 324 stack[index] = NULL; 325 } 326 return captured; 327 } 328 329 330 // os::current_stack_base() 331 // 332 // Returns the base of the stack, which is the stack's 333 // starting address. This function must be called 334 // while running on the stack of the thread being queried. 335 336 address os::current_stack_base() { 337 MEMORY_BASIC_INFORMATION minfo; 338 address stack_bottom; 339 size_t stack_size; 340 341 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 342 stack_bottom = (address)minfo.AllocationBase; 343 stack_size = minfo.RegionSize; 344 345 // Add up the sizes of all the regions with the same 346 // AllocationBase. 347 while (1) { 348 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 349 if (stack_bottom == (address)minfo.AllocationBase) { 350 stack_size += minfo.RegionSize; 351 } else { 352 break; 353 } 354 } 355 356 #ifdef _M_IA64 357 // IA64 has memory and register stacks 358 // 359 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit 360 // at thread creation (1MB backing store growing upwards, 1MB memory stack 361 // growing downwards, 2MB summed up) 362 // 363 // ... 364 // ------- top of stack (high address) ----- 365 // | 366 // | 1MB 367 // | Backing Store (Register Stack) 368 // | 369 // | / \ 370 // | | 371 // | | 372 // | | 373 // ------------------------ stack base ----- 374 // | 1MB 375 // | Memory Stack 376 // | 377 // | | 378 // | | 379 // | | 380 // | \ / 381 // | 382 // ----- bottom of stack (low address) ----- 383 // ... 384 385 stack_size = stack_size / 2; 386 #endif 387 return stack_bottom + stack_size; 388 } 389 390 size_t os::current_stack_size() { 391 size_t sz; 392 MEMORY_BASIC_INFORMATION minfo; 393 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 394 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 395 return sz; 396 } 397 398 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 399 const struct tm* time_struct_ptr = localtime(clock); 400 if (time_struct_ptr != NULL) { 401 *res = *time_struct_ptr; 402 return res; 403 } 404 return NULL; 405 } 406 407 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 408 409 // Thread start routine for all new Java threads 410 static unsigned __stdcall java_start(Thread* thread) { 411 // Try to randomize the cache line index of hot stack frames. 412 // This helps when threads of the same stack traces evict each other's 413 // cache lines. The threads can be either from the same JVM instance, or 414 // from different JVM instances. The benefit is especially true for 415 // processors with hyperthreading technology. 416 static int counter = 0; 417 int pid = os::current_process_id(); 418 _alloca(((pid ^ counter++) & 7) * 128); 419 420 OSThread* osthr = thread->osthread(); 421 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 422 423 if (UseNUMA) { 424 int lgrp_id = os::numa_get_group_id(); 425 if (lgrp_id != -1) { 426 thread->set_lgrp_id(lgrp_id); 427 } 428 } 429 430 // Diagnostic code to investigate JDK-6573254 431 int res = 30115; // non-java thread 432 if (thread->is_Java_thread()) { 433 res = 20115; // java thread 434 } 435 436 // Install a win32 structured exception handler around every thread created 437 // by VM, so VM can generate error dump when an exception occurred in non- 438 // Java thread (e.g. VM thread). 439 __try { 440 thread->run(); 441 } __except(topLevelExceptionFilter( 442 (_EXCEPTION_POINTERS*)_exception_info())) { 443 // Nothing to do. 444 } 445 446 // One less thread is executing 447 // When the VMThread gets here, the main thread may have already exited 448 // which frees the CodeHeap containing the Atomic::add code 449 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 450 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); 451 } 452 453 // Thread must not return from exit_process_or_thread(), but if it does, 454 // let it proceed to exit normally 455 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res); 456 } 457 458 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, 459 int thread_id) { 460 // Allocate the OSThread object 461 OSThread* osthread = new OSThread(NULL, NULL); 462 if (osthread == NULL) return NULL; 463 464 // Initialize support for Java interrupts 465 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 466 if (interrupt_event == NULL) { 467 delete osthread; 468 return NULL; 469 } 470 osthread->set_interrupt_event(interrupt_event); 471 472 // Store info on the Win32 thread into the OSThread 473 osthread->set_thread_handle(thread_handle); 474 osthread->set_thread_id(thread_id); 475 476 if (UseNUMA) { 477 int lgrp_id = os::numa_get_group_id(); 478 if (lgrp_id != -1) { 479 thread->set_lgrp_id(lgrp_id); 480 } 481 } 482 483 // Initial thread state is INITIALIZED, not SUSPENDED 484 osthread->set_state(INITIALIZED); 485 486 return osthread; 487 } 488 489 490 bool os::create_attached_thread(JavaThread* thread) { 491 #ifdef ASSERT 492 thread->verify_not_published(); 493 #endif 494 HANDLE thread_h; 495 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 496 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 497 fatal("DuplicateHandle failed\n"); 498 } 499 OSThread* osthread = create_os_thread(thread, thread_h, 500 (int)current_thread_id()); 501 if (osthread == NULL) { 502 return false; 503 } 504 505 // Initial thread state is RUNNABLE 506 osthread->set_state(RUNNABLE); 507 508 thread->set_osthread(osthread); 509 return true; 510 } 511 512 bool os::create_main_thread(JavaThread* thread) { 513 #ifdef ASSERT 514 thread->verify_not_published(); 515 #endif 516 if (_starting_thread == NULL) { 517 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 518 if (_starting_thread == NULL) { 519 return false; 520 } 521 } 522 523 // The primordial thread is runnable from the start) 524 _starting_thread->set_state(RUNNABLE); 525 526 thread->set_osthread(_starting_thread); 527 return true; 528 } 529 530 // Allocate and initialize a new OSThread 531 bool os::create_thread(Thread* thread, ThreadType thr_type, 532 size_t stack_size) { 533 unsigned thread_id; 534 535 // Allocate the OSThread object 536 OSThread* osthread = new OSThread(NULL, NULL); 537 if (osthread == NULL) { 538 return false; 539 } 540 541 // Initialize support for Java interrupts 542 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 543 if (interrupt_event == NULL) { 544 delete osthread; 545 return NULL; 546 } 547 osthread->set_interrupt_event(interrupt_event); 548 osthread->set_interrupted(false); 549 550 thread->set_osthread(osthread); 551 552 if (stack_size == 0) { 553 switch (thr_type) { 554 case os::java_thread: 555 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 556 if (JavaThread::stack_size_at_create() > 0) { 557 stack_size = JavaThread::stack_size_at_create(); 558 } 559 break; 560 case os::compiler_thread: 561 if (CompilerThreadStackSize > 0) { 562 stack_size = (size_t)(CompilerThreadStackSize * K); 563 break; 564 } // else fall through: 565 // use VMThreadStackSize if CompilerThreadStackSize is not defined 566 case os::vm_thread: 567 case os::pgc_thread: 568 case os::cgc_thread: 569 case os::watcher_thread: 570 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 571 break; 572 } 573 } 574 575 // Create the Win32 thread 576 // 577 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 578 // does not specify stack size. Instead, it specifies the size of 579 // initially committed space. The stack size is determined by 580 // PE header in the executable. If the committed "stack_size" is larger 581 // than default value in the PE header, the stack is rounded up to the 582 // nearest multiple of 1MB. For example if the launcher has default 583 // stack size of 320k, specifying any size less than 320k does not 584 // affect the actual stack size at all, it only affects the initial 585 // commitment. On the other hand, specifying 'stack_size' larger than 586 // default value may cause significant increase in memory usage, because 587 // not only the stack space will be rounded up to MB, but also the 588 // entire space is committed upfront. 589 // 590 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 591 // for CreateThread() that can treat 'stack_size' as stack size. However we 592 // are not supposed to call CreateThread() directly according to MSDN 593 // document because JVM uses C runtime library. The good news is that the 594 // flag appears to work with _beginthredex() as well. 595 596 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION 597 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000) 598 #endif 599 600 HANDLE thread_handle = 601 (HANDLE)_beginthreadex(NULL, 602 (unsigned)stack_size, 603 (unsigned (__stdcall *)(void*)) java_start, 604 thread, 605 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, 606 &thread_id); 607 if (thread_handle == NULL) { 608 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again 609 // without the flag. 610 thread_handle = 611 (HANDLE)_beginthreadex(NULL, 612 (unsigned)stack_size, 613 (unsigned (__stdcall *)(void*)) java_start, 614 thread, 615 CREATE_SUSPENDED, 616 &thread_id); 617 } 618 if (thread_handle == NULL) { 619 // Need to clean up stuff we've allocated so far 620 CloseHandle(osthread->interrupt_event()); 621 thread->set_osthread(NULL); 622 delete osthread; 623 return NULL; 624 } 625 626 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); 627 628 // Store info on the Win32 thread into the OSThread 629 osthread->set_thread_handle(thread_handle); 630 osthread->set_thread_id(thread_id); 631 632 // Initial thread state is INITIALIZED, not SUSPENDED 633 osthread->set_state(INITIALIZED); 634 635 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 636 return true; 637 } 638 639 640 // Free Win32 resources related to the OSThread 641 void os::free_thread(OSThread* osthread) { 642 assert(osthread != NULL, "osthread not set"); 643 CloseHandle(osthread->thread_handle()); 644 CloseHandle(osthread->interrupt_event()); 645 delete osthread; 646 } 647 648 static jlong first_filetime; 649 static jlong initial_performance_count; 650 static jlong performance_frequency; 651 652 653 jlong as_long(LARGE_INTEGER x) { 654 jlong result = 0; // initialization to avoid warning 655 set_high(&result, x.HighPart); 656 set_low(&result, x.LowPart); 657 return result; 658 } 659 660 661 jlong os::elapsed_counter() { 662 LARGE_INTEGER count; 663 if (win32::_has_performance_count) { 664 QueryPerformanceCounter(&count); 665 return as_long(count) - initial_performance_count; 666 } else { 667 FILETIME wt; 668 GetSystemTimeAsFileTime(&wt); 669 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime); 670 } 671 } 672 673 674 jlong os::elapsed_frequency() { 675 if (win32::_has_performance_count) { 676 return performance_frequency; 677 } else { 678 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601. 679 return 10000000; 680 } 681 } 682 683 684 julong os::available_memory() { 685 return win32::available_memory(); 686 } 687 688 julong os::win32::available_memory() { 689 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 690 // value if total memory is larger than 4GB 691 MEMORYSTATUSEX ms; 692 ms.dwLength = sizeof(ms); 693 GlobalMemoryStatusEx(&ms); 694 695 return (julong)ms.ullAvailPhys; 696 } 697 698 julong os::physical_memory() { 699 return win32::physical_memory(); 700 } 701 702 bool os::has_allocatable_memory_limit(julong* limit) { 703 MEMORYSTATUSEX ms; 704 ms.dwLength = sizeof(ms); 705 GlobalMemoryStatusEx(&ms); 706 #ifdef _LP64 707 *limit = (julong)ms.ullAvailVirtual; 708 return true; 709 #else 710 // Limit to 1400m because of the 2gb address space wall 711 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual); 712 return true; 713 #endif 714 } 715 716 // VC6 lacks DWORD_PTR 717 #if _MSC_VER < 1300 718 typedef UINT_PTR DWORD_PTR; 719 #endif 720 721 int os::active_processor_count() { 722 DWORD_PTR lpProcessAffinityMask = 0; 723 DWORD_PTR lpSystemAffinityMask = 0; 724 int proc_count = processor_count(); 725 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 726 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 727 // Nof active processors is number of bits in process affinity mask 728 int bitcount = 0; 729 while (lpProcessAffinityMask != 0) { 730 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 731 bitcount++; 732 } 733 return bitcount; 734 } else { 735 return proc_count; 736 } 737 } 738 739 void os::set_native_thread_name(const char *name) { 740 741 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx 742 // 743 // Note that unfortunately this only works if the process 744 // is already attached to a debugger; debugger must observe 745 // the exception below to show the correct name. 746 747 const DWORD MS_VC_EXCEPTION = 0x406D1388; 748 struct { 749 DWORD dwType; // must be 0x1000 750 LPCSTR szName; // pointer to name (in user addr space) 751 DWORD dwThreadID; // thread ID (-1=caller thread) 752 DWORD dwFlags; // reserved for future use, must be zero 753 } info; 754 755 info.dwType = 0x1000; 756 info.szName = name; 757 info.dwThreadID = -1; 758 info.dwFlags = 0; 759 760 __try { 761 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info ); 762 } __except(EXCEPTION_CONTINUE_EXECUTION) {} 763 } 764 765 bool os::distribute_processes(uint length, uint* distribution) { 766 // Not yet implemented. 767 return false; 768 } 769 770 bool os::bind_to_processor(uint processor_id) { 771 // Not yet implemented. 772 return false; 773 } 774 775 void os::win32::initialize_performance_counter() { 776 LARGE_INTEGER count; 777 if (QueryPerformanceFrequency(&count)) { 778 win32::_has_performance_count = 1; 779 performance_frequency = as_long(count); 780 QueryPerformanceCounter(&count); 781 initial_performance_count = as_long(count); 782 } else { 783 win32::_has_performance_count = 0; 784 FILETIME wt; 785 GetSystemTimeAsFileTime(&wt); 786 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 787 } 788 } 789 790 791 double os::elapsedTime() { 792 return (double) elapsed_counter() / (double) elapsed_frequency(); 793 } 794 795 796 // Windows format: 797 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 798 // Java format: 799 // Java standards require the number of milliseconds since 1/1/1970 800 801 // Constant offset - calculated using offset() 802 static jlong _offset = 116444736000000000; 803 // Fake time counter for reproducible results when debugging 804 static jlong fake_time = 0; 805 806 #ifdef ASSERT 807 // Just to be safe, recalculate the offset in debug mode 808 static jlong _calculated_offset = 0; 809 static int _has_calculated_offset = 0; 810 811 jlong offset() { 812 if (_has_calculated_offset) return _calculated_offset; 813 SYSTEMTIME java_origin; 814 java_origin.wYear = 1970; 815 java_origin.wMonth = 1; 816 java_origin.wDayOfWeek = 0; // ignored 817 java_origin.wDay = 1; 818 java_origin.wHour = 0; 819 java_origin.wMinute = 0; 820 java_origin.wSecond = 0; 821 java_origin.wMilliseconds = 0; 822 FILETIME jot; 823 if (!SystemTimeToFileTime(&java_origin, &jot)) { 824 fatal(err_msg("Error = %d\nWindows error", GetLastError())); 825 } 826 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 827 _has_calculated_offset = 1; 828 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 829 return _calculated_offset; 830 } 831 #else 832 jlong offset() { 833 return _offset; 834 } 835 #endif 836 837 jlong windows_to_java_time(FILETIME wt) { 838 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 839 return (a - offset()) / 10000; 840 } 841 842 // Returns time ticks in (10th of micro seconds) 843 jlong windows_to_time_ticks(FILETIME wt) { 844 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 845 return (a - offset()); 846 } 847 848 FILETIME java_to_windows_time(jlong l) { 849 jlong a = (l * 10000) + offset(); 850 FILETIME result; 851 result.dwHighDateTime = high(a); 852 result.dwLowDateTime = low(a); 853 return result; 854 } 855 856 bool os::supports_vtime() { return true; } 857 bool os::enable_vtime() { return false; } 858 bool os::vtime_enabled() { return false; } 859 860 double os::elapsedVTime() { 861 FILETIME created; 862 FILETIME exited; 863 FILETIME kernel; 864 FILETIME user; 865 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) { 866 // the resolution of windows_to_java_time() should be sufficient (ms) 867 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS; 868 } else { 869 return elapsedTime(); 870 } 871 } 872 873 jlong os::javaTimeMillis() { 874 if (UseFakeTimers) { 875 return fake_time++; 876 } else { 877 FILETIME wt; 878 GetSystemTimeAsFileTime(&wt); 879 return windows_to_java_time(wt); 880 } 881 } 882 883 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 884 FILETIME wt; 885 GetSystemTimeAsFileTime(&wt); 886 jlong ticks = windows_to_time_ticks(wt); // 10th of micros 887 jlong secs = jlong(ticks / 10000000); // 10000 * 1000 888 seconds = secs; 889 nanos = jlong(ticks - (secs*10000000)) * 100; 890 } 891 892 jlong os::javaTimeNanos() { 893 if (!win32::_has_performance_count) { 894 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do. 895 } else { 896 LARGE_INTEGER current_count; 897 QueryPerformanceCounter(¤t_count); 898 double current = as_long(current_count); 899 double freq = performance_frequency; 900 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC); 901 return time; 902 } 903 } 904 905 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 906 if (!win32::_has_performance_count) { 907 // javaTimeMillis() doesn't have much percision, 908 // but it is not going to wrap -- so all 64 bits 909 info_ptr->max_value = ALL_64_BITS; 910 911 // this is a wall clock timer, so may skip 912 info_ptr->may_skip_backward = true; 913 info_ptr->may_skip_forward = true; 914 } else { 915 jlong freq = performance_frequency; 916 if (freq < NANOSECS_PER_SEC) { 917 // the performance counter is 64 bits and we will 918 // be multiplying it -- so no wrap in 64 bits 919 info_ptr->max_value = ALL_64_BITS; 920 } else if (freq > NANOSECS_PER_SEC) { 921 // use the max value the counter can reach to 922 // determine the max value which could be returned 923 julong max_counter = (julong)ALL_64_BITS; 924 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC)); 925 } else { 926 // the performance counter is 64 bits and we will 927 // be using it directly -- so no wrap in 64 bits 928 info_ptr->max_value = ALL_64_BITS; 929 } 930 931 // using a counter, so no skipping 932 info_ptr->may_skip_backward = false; 933 info_ptr->may_skip_forward = false; 934 } 935 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 936 } 937 938 char* os::local_time_string(char *buf, size_t buflen) { 939 SYSTEMTIME st; 940 GetLocalTime(&st); 941 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 942 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 943 return buf; 944 } 945 946 bool os::getTimesSecs(double* process_real_time, 947 double* process_user_time, 948 double* process_system_time) { 949 HANDLE h_process = GetCurrentProcess(); 950 FILETIME create_time, exit_time, kernel_time, user_time; 951 BOOL result = GetProcessTimes(h_process, 952 &create_time, 953 &exit_time, 954 &kernel_time, 955 &user_time); 956 if (result != 0) { 957 FILETIME wt; 958 GetSystemTimeAsFileTime(&wt); 959 jlong rtc_millis = windows_to_java_time(wt); 960 jlong user_millis = windows_to_java_time(user_time); 961 jlong system_millis = windows_to_java_time(kernel_time); 962 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 963 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); 964 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); 965 return true; 966 } else { 967 return false; 968 } 969 } 970 971 void os::shutdown() { 972 // allow PerfMemory to attempt cleanup of any persistent resources 973 perfMemory_exit(); 974 975 // flush buffered output, finish log files 976 ostream_abort(); 977 978 // Check for abort hook 979 abort_hook_t abort_hook = Arguments::abort_hook(); 980 if (abort_hook != NULL) { 981 abort_hook(); 982 } 983 } 984 985 986 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 987 PMINIDUMP_EXCEPTION_INFORMATION, 988 PMINIDUMP_USER_STREAM_INFORMATION, 989 PMINIDUMP_CALLBACK_INFORMATION); 990 991 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) { 992 HINSTANCE dbghelp; 993 EXCEPTION_POINTERS ep; 994 MINIDUMP_EXCEPTION_INFORMATION mei; 995 MINIDUMP_EXCEPTION_INFORMATION* pmei; 996 997 HANDLE hProcess = GetCurrentProcess(); 998 DWORD processId = GetCurrentProcessId(); 999 HANDLE dumpFile; 1000 MINIDUMP_TYPE dumpType; 1001 static const char* cwd; 1002 1003 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows. 1004 #ifndef ASSERT 1005 // If running on a client version of Windows and user has not explicitly enabled dumping 1006 if (!os::win32::is_windows_server() && !CreateCoredumpOnCrash) { 1007 VMError::report_coredump_status("Coredumps are not enabled by default on client versions of Windows", false); 1008 return; 1009 // If running on a server version of Windows and user has explictly disabled dumping 1010 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) { 1011 VMError::report_coredump_status("Coredump has been disabled from the command line", false); 1012 return; 1013 } 1014 #else 1015 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) { 1016 VMError::report_coredump_status("Coredump has been disabled from the command line", false); 1017 return; 1018 } 1019 #endif 1020 1021 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0); 1022 1023 if (dbghelp == NULL) { 1024 VMError::report_coredump_status("Failed to load dbghelp.dll", false); 1025 return; 1026 } 1027 1028 _MiniDumpWriteDump = 1029 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 1030 PMINIDUMP_EXCEPTION_INFORMATION, 1031 PMINIDUMP_USER_STREAM_INFORMATION, 1032 PMINIDUMP_CALLBACK_INFORMATION), 1033 GetProcAddress(dbghelp, 1034 "MiniDumpWriteDump")); 1035 1036 if (_MiniDumpWriteDump == NULL) { 1037 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false); 1038 return; 1039 } 1040 1041 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData); 1042 1043 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with 1044 // API_VERSION_NUMBER 11 or higher contains the ones we want though 1045 #if API_VERSION_NUMBER >= 11 1046 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | 1047 MiniDumpWithUnloadedModules); 1048 #endif 1049 1050 cwd = get_current_directory(NULL, 0); 1051 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp", cwd, current_process_id()); 1052 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); 1053 1054 if (dumpFile == INVALID_HANDLE_VALUE) { 1055 VMError::report_coredump_status("Failed to create file for dumping", false); 1056 return; 1057 } 1058 if (exceptionRecord != NULL && contextRecord != NULL) { 1059 ep.ContextRecord = (PCONTEXT) contextRecord; 1060 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord; 1061 1062 mei.ThreadId = GetCurrentThreadId(); 1063 mei.ExceptionPointers = &ep; 1064 pmei = &mei; 1065 } else { 1066 pmei = NULL; 1067 } 1068 1069 1070 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all 1071 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then. 1072 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false && 1073 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) { 1074 DWORD error = GetLastError(); 1075 LPTSTR msgbuf = NULL; 1076 1077 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | 1078 FORMAT_MESSAGE_FROM_SYSTEM | 1079 FORMAT_MESSAGE_IGNORE_INSERTS, 1080 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) { 1081 1082 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf); 1083 LocalFree(msgbuf); 1084 } else { 1085 // Call to FormatMessage failed, just include the result from GetLastError 1086 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error); 1087 } 1088 VMError::report_coredump_status(buffer, false); 1089 } else { 1090 VMError::report_coredump_status(buffer, true); 1091 } 1092 1093 CloseHandle(dumpFile); 1094 } 1095 1096 1097 void os::abort(bool dump_core) { 1098 os::shutdown(); 1099 // no core dump on Windows 1100 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1101 } 1102 1103 // Die immediately, no exit hook, no abort hook, no cleanup. 1104 void os::die() { 1105 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1); 1106 } 1107 1108 // Directory routines copied from src/win32/native/java/io/dirent_md.c 1109 // * dirent_md.c 1.15 00/02/02 1110 // 1111 // The declarations for DIR and struct dirent are in jvm_win32.h. 1112 1113 // Caller must have already run dirname through JVM_NativePath, which removes 1114 // duplicate slashes and converts all instances of '/' into '\\'. 1115 1116 DIR * os::opendir(const char *dirname) { 1117 assert(dirname != NULL, "just checking"); // hotspot change 1118 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal); 1119 DWORD fattr; // hotspot change 1120 char alt_dirname[4] = { 0, 0, 0, 0 }; 1121 1122 if (dirp == 0) { 1123 errno = ENOMEM; 1124 return 0; 1125 } 1126 1127 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it 1128 // as a directory in FindFirstFile(). We detect this case here and 1129 // prepend the current drive name. 1130 // 1131 if (dirname[1] == '\0' && dirname[0] == '\\') { 1132 alt_dirname[0] = _getdrive() + 'A' - 1; 1133 alt_dirname[1] = ':'; 1134 alt_dirname[2] = '\\'; 1135 alt_dirname[3] = '\0'; 1136 dirname = alt_dirname; 1137 } 1138 1139 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal); 1140 if (dirp->path == 0) { 1141 free(dirp); 1142 errno = ENOMEM; 1143 return 0; 1144 } 1145 strcpy(dirp->path, dirname); 1146 1147 fattr = GetFileAttributes(dirp->path); 1148 if (fattr == 0xffffffff) { 1149 free(dirp->path); 1150 free(dirp); 1151 errno = ENOENT; 1152 return 0; 1153 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 1154 free(dirp->path); 1155 free(dirp); 1156 errno = ENOTDIR; 1157 return 0; 1158 } 1159 1160 // Append "*.*", or possibly "\\*.*", to path 1161 if (dirp->path[1] == ':' && 1162 (dirp->path[2] == '\0' || 1163 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 1164 // No '\\' needed for cases like "Z:" or "Z:\" 1165 strcat(dirp->path, "*.*"); 1166 } else { 1167 strcat(dirp->path, "\\*.*"); 1168 } 1169 1170 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 1171 if (dirp->handle == INVALID_HANDLE_VALUE) { 1172 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 1173 free(dirp->path); 1174 free(dirp); 1175 errno = EACCES; 1176 return 0; 1177 } 1178 } 1179 return dirp; 1180 } 1181 1182 // parameter dbuf unused on Windows 1183 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) { 1184 assert(dirp != NULL, "just checking"); // hotspot change 1185 if (dirp->handle == INVALID_HANDLE_VALUE) { 1186 return 0; 1187 } 1188 1189 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 1190 1191 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 1192 if (GetLastError() == ERROR_INVALID_HANDLE) { 1193 errno = EBADF; 1194 return 0; 1195 } 1196 FindClose(dirp->handle); 1197 dirp->handle = INVALID_HANDLE_VALUE; 1198 } 1199 1200 return &dirp->dirent; 1201 } 1202 1203 int os::closedir(DIR *dirp) { 1204 assert(dirp != NULL, "just checking"); // hotspot change 1205 if (dirp->handle != INVALID_HANDLE_VALUE) { 1206 if (!FindClose(dirp->handle)) { 1207 errno = EBADF; 1208 return -1; 1209 } 1210 dirp->handle = INVALID_HANDLE_VALUE; 1211 } 1212 free(dirp->path); 1213 free(dirp); 1214 return 0; 1215 } 1216 1217 // This must be hard coded because it's the system's temporary 1218 // directory not the java application's temp directory, ala java.io.tmpdir. 1219 const char* os::get_temp_directory() { 1220 static char path_buf[MAX_PATH]; 1221 if (GetTempPath(MAX_PATH, path_buf) > 0) { 1222 return path_buf; 1223 } else { 1224 path_buf[0] = '\0'; 1225 return path_buf; 1226 } 1227 } 1228 1229 static bool file_exists(const char* filename) { 1230 if (filename == NULL || strlen(filename) == 0) { 1231 return false; 1232 } 1233 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES; 1234 } 1235 1236 bool os::dll_build_name(char *buffer, size_t buflen, 1237 const char* pname, const char* fname) { 1238 bool retval = false; 1239 const size_t pnamelen = pname ? strlen(pname) : 0; 1240 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0; 1241 1242 // Return error on buffer overflow. 1243 if (pnamelen + strlen(fname) + 10 > buflen) { 1244 return retval; 1245 } 1246 1247 if (pnamelen == 0) { 1248 jio_snprintf(buffer, buflen, "%s.dll", fname); 1249 retval = true; 1250 } else if (c == ':' || c == '\\') { 1251 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname); 1252 retval = true; 1253 } else if (strchr(pname, *os::path_separator()) != NULL) { 1254 int n; 1255 char** pelements = split_path(pname, &n); 1256 if (pelements == NULL) { 1257 return false; 1258 } 1259 for (int i = 0; i < n; i++) { 1260 char* path = pelements[i]; 1261 // Really shouldn't be NULL, but check can't hurt 1262 size_t plen = (path == NULL) ? 0 : strlen(path); 1263 if (plen == 0) { 1264 continue; // skip the empty path values 1265 } 1266 const char lastchar = path[plen - 1]; 1267 if (lastchar == ':' || lastchar == '\\') { 1268 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname); 1269 } else { 1270 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname); 1271 } 1272 if (file_exists(buffer)) { 1273 retval = true; 1274 break; 1275 } 1276 } 1277 // release the storage 1278 for (int i = 0; i < n; i++) { 1279 if (pelements[i] != NULL) { 1280 FREE_C_HEAP_ARRAY(char, pelements[i]); 1281 } 1282 } 1283 if (pelements != NULL) { 1284 FREE_C_HEAP_ARRAY(char*, pelements); 1285 } 1286 } else { 1287 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname); 1288 retval = true; 1289 } 1290 return retval; 1291 } 1292 1293 // Needs to be in os specific directory because windows requires another 1294 // header file <direct.h> 1295 const char* os::get_current_directory(char *buf, size_t buflen) { 1296 int n = static_cast<int>(buflen); 1297 if (buflen > INT_MAX) n = INT_MAX; 1298 return _getcwd(buf, n); 1299 } 1300 1301 //----------------------------------------------------------- 1302 // Helper functions for fatal error handler 1303 #ifdef _WIN64 1304 // Helper routine which returns true if address in 1305 // within the NTDLL address space. 1306 // 1307 static bool _addr_in_ntdll(address addr) { 1308 HMODULE hmod; 1309 MODULEINFO minfo; 1310 1311 hmod = GetModuleHandle("NTDLL.DLL"); 1312 if (hmod == NULL) return false; 1313 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod, 1314 &minfo, sizeof(MODULEINFO))) { 1315 return false; 1316 } 1317 1318 if ((addr >= minfo.lpBaseOfDll) && 1319 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) { 1320 return true; 1321 } else { 1322 return false; 1323 } 1324 } 1325 #endif 1326 1327 struct _modinfo { 1328 address addr; 1329 char* full_path; // point to a char buffer 1330 int buflen; // size of the buffer 1331 address base_addr; 1332 }; 1333 1334 static int _locate_module_by_addr(const char * mod_fname, address base_addr, 1335 address top_address, void * param) { 1336 struct _modinfo *pmod = (struct _modinfo *)param; 1337 if (!pmod) return -1; 1338 1339 if (base_addr <= pmod->addr && 1340 top_address > pmod->addr) { 1341 // if a buffer is provided, copy path name to the buffer 1342 if (pmod->full_path) { 1343 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1344 } 1345 pmod->base_addr = base_addr; 1346 return 1; 1347 } 1348 return 0; 1349 } 1350 1351 bool os::dll_address_to_library_name(address addr, char* buf, 1352 int buflen, int* offset) { 1353 // buf is not optional, but offset is optional 1354 assert(buf != NULL, "sanity check"); 1355 1356 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1357 // return the full path to the DLL file, sometimes it returns path 1358 // to the corresponding PDB file (debug info); sometimes it only 1359 // returns partial path, which makes life painful. 1360 1361 struct _modinfo mi; 1362 mi.addr = addr; 1363 mi.full_path = buf; 1364 mi.buflen = buflen; 1365 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) { 1366 // buf already contains path name 1367 if (offset) *offset = addr - mi.base_addr; 1368 return true; 1369 } 1370 1371 buf[0] = '\0'; 1372 if (offset) *offset = -1; 1373 return false; 1374 } 1375 1376 bool os::dll_address_to_function_name(address addr, char *buf, 1377 int buflen, int *offset) { 1378 // buf is not optional, but offset is optional 1379 assert(buf != NULL, "sanity check"); 1380 1381 if (Decoder::decode(addr, buf, buflen, offset)) { 1382 return true; 1383 } 1384 if (offset != NULL) *offset = -1; 1385 buf[0] = '\0'; 1386 return false; 1387 } 1388 1389 // save the start and end address of jvm.dll into param[0] and param[1] 1390 static int _locate_jvm_dll(const char* mod_fname, address base_addr, 1391 address top_address, void * param) { 1392 if (!param) return -1; 1393 1394 if (base_addr <= (address)_locate_jvm_dll && 1395 top_address > (address)_locate_jvm_dll) { 1396 ((address*)param)[0] = base_addr; 1397 ((address*)param)[1] = top_address; 1398 return 1; 1399 } 1400 return 0; 1401 } 1402 1403 address vm_lib_location[2]; // start and end address of jvm.dll 1404 1405 // check if addr is inside jvm.dll 1406 bool os::address_is_in_vm(address addr) { 1407 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1408 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) { 1409 assert(false, "Can't find jvm module."); 1410 return false; 1411 } 1412 } 1413 1414 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1415 } 1416 1417 // print module info; param is outputStream* 1418 static int _print_module(const char* fname, address base_address, 1419 address top_address, void* param) { 1420 if (!param) return -1; 1421 1422 outputStream* st = (outputStream*)param; 1423 1424 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname); 1425 return 0; 1426 } 1427 1428 // Loads .dll/.so and 1429 // in case of error it checks if .dll/.so was built for the 1430 // same architecture as Hotspot is running on 1431 void * os::dll_load(const char *name, char *ebuf, int ebuflen) { 1432 void * result = LoadLibrary(name); 1433 if (result != NULL) { 1434 return result; 1435 } 1436 1437 DWORD errcode = GetLastError(); 1438 if (errcode == ERROR_MOD_NOT_FOUND) { 1439 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1); 1440 ebuf[ebuflen - 1] = '\0'; 1441 return NULL; 1442 } 1443 1444 // Parsing dll below 1445 // If we can read dll-info and find that dll was built 1446 // for an architecture other than Hotspot is running in 1447 // - then print to buffer "DLL was built for a different architecture" 1448 // else call os::lasterror to obtain system error message 1449 1450 // Read system error message into ebuf 1451 // It may or may not be overwritten below (in the for loop and just above) 1452 lasterror(ebuf, (size_t) ebuflen); 1453 ebuf[ebuflen - 1] = '\0'; 1454 int fd = ::open(name, O_RDONLY | O_BINARY, 0); 1455 if (fd < 0) { 1456 return NULL; 1457 } 1458 1459 uint32_t signature_offset; 1460 uint16_t lib_arch = 0; 1461 bool failed_to_get_lib_arch = 1462 ( // Go to position 3c in the dll 1463 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0) 1464 || 1465 // Read location of signature 1466 (sizeof(signature_offset) != 1467 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset)))) 1468 || 1469 // Go to COFF File Header in dll 1470 // that is located after "signature" (4 bytes long) 1471 (os::seek_to_file_offset(fd, 1472 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0) 1473 || 1474 // Read field that contains code of architecture 1475 // that dll was built for 1476 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch)))) 1477 ); 1478 1479 ::close(fd); 1480 if (failed_to_get_lib_arch) { 1481 // file i/o error - report os::lasterror(...) msg 1482 return NULL; 1483 } 1484 1485 typedef struct { 1486 uint16_t arch_code; 1487 char* arch_name; 1488 } arch_t; 1489 1490 static const arch_t arch_array[] = { 1491 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1492 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1493 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1494 }; 1495 #if (defined _M_IA64) 1496 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64; 1497 #elif (defined _M_AMD64) 1498 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64; 1499 #elif (defined _M_IX86) 1500 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386; 1501 #else 1502 #error Method os::dll_load requires that one of following \ 1503 is defined :_M_IA64,_M_AMD64 or _M_IX86 1504 #endif 1505 1506 1507 // Obtain a string for printf operation 1508 // lib_arch_str shall contain string what platform this .dll was built for 1509 // running_arch_str shall string contain what platform Hotspot was built for 1510 char *running_arch_str = NULL, *lib_arch_str = NULL; 1511 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) { 1512 if (lib_arch == arch_array[i].arch_code) { 1513 lib_arch_str = arch_array[i].arch_name; 1514 } 1515 if (running_arch == arch_array[i].arch_code) { 1516 running_arch_str = arch_array[i].arch_name; 1517 } 1518 } 1519 1520 assert(running_arch_str, 1521 "Didn't find running architecture code in arch_array"); 1522 1523 // If the architecture is right 1524 // but some other error took place - report os::lasterror(...) msg 1525 if (lib_arch == running_arch) { 1526 return NULL; 1527 } 1528 1529 if (lib_arch_str != NULL) { 1530 ::_snprintf(ebuf, ebuflen - 1, 1531 "Can't load %s-bit .dll on a %s-bit platform", 1532 lib_arch_str, running_arch_str); 1533 } else { 1534 // don't know what architecture this dll was build for 1535 ::_snprintf(ebuf, ebuflen - 1, 1536 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1537 lib_arch, running_arch_str); 1538 } 1539 1540 return NULL; 1541 } 1542 1543 void os::print_dll_info(outputStream *st) { 1544 st->print_cr("Dynamic libraries:"); 1545 get_loaded_modules_info(_print_module, (void *)st); 1546 } 1547 1548 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1549 HANDLE hProcess; 1550 1551 # define MAX_NUM_MODULES 128 1552 HMODULE modules[MAX_NUM_MODULES]; 1553 static char filename[MAX_PATH]; 1554 int result = 0; 1555 1556 if (!os::PSApiDll::PSApiAvailable()) { 1557 return 0; 1558 } 1559 1560 int pid = os::current_process_id(); 1561 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1562 FALSE, pid); 1563 if (hProcess == NULL) return 0; 1564 1565 DWORD size_needed; 1566 if (!os::PSApiDll::EnumProcessModules(hProcess, modules, 1567 sizeof(modules), &size_needed)) { 1568 CloseHandle(hProcess); 1569 return 0; 1570 } 1571 1572 // number of modules that are currently loaded 1573 int num_modules = size_needed / sizeof(HMODULE); 1574 1575 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1576 // Get Full pathname: 1577 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i], 1578 filename, sizeof(filename))) { 1579 filename[0] = '\0'; 1580 } 1581 1582 MODULEINFO modinfo; 1583 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i], 1584 &modinfo, sizeof(modinfo))) { 1585 modinfo.lpBaseOfDll = NULL; 1586 modinfo.SizeOfImage = 0; 1587 } 1588 1589 // Invoke callback function 1590 result = callback(filename, (address)modinfo.lpBaseOfDll, 1591 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param); 1592 if (result) break; 1593 } 1594 1595 CloseHandle(hProcess); 1596 return result; 1597 } 1598 1599 void os::print_os_info_brief(outputStream* st) { 1600 os::print_os_info(st); 1601 } 1602 1603 void os::print_os_info(outputStream* st) { 1604 #ifdef ASSERT 1605 char buffer[1024]; 1606 DWORD size = sizeof(buffer); 1607 st->print(" HostName: "); 1608 if (GetComputerNameEx(ComputerNameDnsHostname, buffer, &size)) { 1609 st->print("%s", buffer); 1610 } else { 1611 st->print("N/A"); 1612 } 1613 #endif 1614 st->print(" OS:"); 1615 os::win32::print_windows_version(st); 1616 } 1617 1618 void os::win32::print_windows_version(outputStream* st) { 1619 OSVERSIONINFOEX osvi; 1620 VS_FIXEDFILEINFO *file_info; 1621 TCHAR kernel32_path[MAX_PATH]; 1622 UINT len, ret; 1623 1624 // Use the GetVersionEx information to see if we're on a server or 1625 // workstation edition of Windows. Starting with Windows 8.1 we can't 1626 // trust the OS version information returned by this API. 1627 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1628 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1629 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1630 st->print_cr("Call to GetVersionEx failed"); 1631 return; 1632 } 1633 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION); 1634 1635 // Get the full path to \Windows\System32\kernel32.dll and use that for 1636 // determining what version of Windows we're running on. 1637 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1; 1638 ret = GetSystemDirectory(kernel32_path, len); 1639 if (ret == 0 || ret > len) { 1640 st->print_cr("Call to GetSystemDirectory failed"); 1641 return; 1642 } 1643 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret); 1644 1645 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL); 1646 if (version_size == 0) { 1647 st->print_cr("Call to GetFileVersionInfoSize failed"); 1648 return; 1649 } 1650 1651 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal); 1652 if (version_info == NULL) { 1653 st->print_cr("Failed to allocate version_info"); 1654 return; 1655 } 1656 1657 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) { 1658 os::free(version_info); 1659 st->print_cr("Call to GetFileVersionInfo failed"); 1660 return; 1661 } 1662 1663 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) { 1664 os::free(version_info); 1665 st->print_cr("Call to VerQueryValue failed"); 1666 return; 1667 } 1668 1669 int major_version = HIWORD(file_info->dwProductVersionMS); 1670 int minor_version = LOWORD(file_info->dwProductVersionMS); 1671 int build_number = HIWORD(file_info->dwProductVersionLS); 1672 int build_minor = LOWORD(file_info->dwProductVersionLS); 1673 int os_vers = major_version * 1000 + minor_version; 1674 os::free(version_info); 1675 1676 st->print(" Windows "); 1677 switch (os_vers) { 1678 1679 case 6000: 1680 if (is_workstation) { 1681 st->print("Vista"); 1682 } else { 1683 st->print("Server 2008"); 1684 } 1685 break; 1686 1687 case 6001: 1688 if (is_workstation) { 1689 st->print("7"); 1690 } else { 1691 st->print("Server 2008 R2"); 1692 } 1693 break; 1694 1695 case 6002: 1696 if (is_workstation) { 1697 st->print("8"); 1698 } else { 1699 st->print("Server 2012"); 1700 } 1701 break; 1702 1703 case 6003: 1704 if (is_workstation) { 1705 st->print("8.1"); 1706 } else { 1707 st->print("Server 2012 R2"); 1708 } 1709 break; 1710 1711 case 10000: 1712 if (is_workstation) { 1713 st->print("10"); 1714 } else { 1715 // The server version name of Windows 10 is not known at this time 1716 st->print("%d.%d", major_version, minor_version); 1717 } 1718 break; 1719 1720 default: 1721 // Unrecognized windows, print out its major and minor versions 1722 st->print("%d.%d", major_version, minor_version); 1723 break; 1724 } 1725 1726 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1727 // find out whether we are running on 64 bit processor or not 1728 SYSTEM_INFO si; 1729 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1730 os::Kernel32Dll::GetNativeSystemInfo(&si); 1731 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1732 st->print(" , 64 bit"); 1733 } 1734 1735 st->print(" Build %d", build_number); 1736 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor); 1737 st->cr(); 1738 } 1739 1740 void os::pd_print_cpu_info(outputStream* st) { 1741 // Nothing to do for now. 1742 } 1743 1744 void os::print_memory_info(outputStream* st) { 1745 st->print("Memory:"); 1746 st->print(" %dk page", os::vm_page_size()>>10); 1747 1748 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1749 // value if total memory is larger than 4GB 1750 MEMORYSTATUSEX ms; 1751 ms.dwLength = sizeof(ms); 1752 GlobalMemoryStatusEx(&ms); 1753 1754 st->print(", physical %uk", os::physical_memory() >> 10); 1755 st->print("(%uk free)", os::available_memory() >> 10); 1756 1757 st->print(", swap %uk", ms.ullTotalPageFile >> 10); 1758 st->print("(%uk free)", ms.ullAvailPageFile >> 10); 1759 st->cr(); 1760 } 1761 1762 void os::print_siginfo(outputStream *st, void *siginfo) { 1763 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1764 st->print("siginfo:"); 1765 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1766 1767 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1768 er->NumberParameters >= 2) { 1769 switch (er->ExceptionInformation[0]) { 1770 case 0: st->print(", reading address"); break; 1771 case 1: st->print(", writing address"); break; 1772 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1773 er->ExceptionInformation[0]); 1774 } 1775 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1776 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1777 er->NumberParameters >= 2 && UseSharedSpaces) { 1778 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1779 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1780 st->print("\n\nError accessing class data sharing archive." \ 1781 " Mapped file inaccessible during execution, " \ 1782 " possible disk/network problem."); 1783 } 1784 } else { 1785 int num = er->NumberParameters; 1786 if (num > 0) { 1787 st->print(", ExceptionInformation="); 1788 for (int i = 0; i < num; i++) { 1789 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1790 } 1791 } 1792 } 1793 st->cr(); 1794 } 1795 1796 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1797 // do nothing 1798 } 1799 1800 static char saved_jvm_path[MAX_PATH] = {0}; 1801 1802 // Find the full path to the current module, jvm.dll 1803 void os::jvm_path(char *buf, jint buflen) { 1804 // Error checking. 1805 if (buflen < MAX_PATH) { 1806 assert(false, "must use a large-enough buffer"); 1807 buf[0] = '\0'; 1808 return; 1809 } 1810 // Lazy resolve the path to current module. 1811 if (saved_jvm_path[0] != 0) { 1812 strcpy(buf, saved_jvm_path); 1813 return; 1814 } 1815 1816 buf[0] = '\0'; 1817 if (Arguments::sun_java_launcher_is_altjvm()) { 1818 // Support for the java launcher's '-XXaltjvm=<path>' option. Check 1819 // for a JAVA_HOME environment variable and fix up the path so it 1820 // looks like jvm.dll is installed there (append a fake suffix 1821 // hotspot/jvm.dll). 1822 char* java_home_var = ::getenv("JAVA_HOME"); 1823 if (java_home_var != NULL && java_home_var[0] != 0 && 1824 strlen(java_home_var) < (size_t)buflen) { 1825 strncpy(buf, java_home_var, buflen); 1826 1827 // determine if this is a legacy image or modules image 1828 // modules image doesn't have "jre" subdirectory 1829 size_t len = strlen(buf); 1830 char* jrebin_p = buf + len; 1831 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1832 if (0 != _access(buf, 0)) { 1833 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1834 } 1835 len = strlen(buf); 1836 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1837 } 1838 } 1839 1840 if (buf[0] == '\0') { 1841 GetModuleFileName(vm_lib_handle, buf, buflen); 1842 } 1843 strncpy(saved_jvm_path, buf, MAX_PATH); 1844 saved_jvm_path[MAX_PATH - 1] = '\0'; 1845 } 1846 1847 1848 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1849 #ifndef _WIN64 1850 st->print("_"); 1851 #endif 1852 } 1853 1854 1855 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1856 #ifndef _WIN64 1857 st->print("@%d", args_size * sizeof(int)); 1858 #endif 1859 } 1860 1861 // This method is a copy of JDK's sysGetLastErrorString 1862 // from src/windows/hpi/src/system_md.c 1863 1864 size_t os::lasterror(char* buf, size_t len) { 1865 DWORD errval; 1866 1867 if ((errval = GetLastError()) != 0) { 1868 // DOS error 1869 size_t n = (size_t)FormatMessage( 1870 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1871 NULL, 1872 errval, 1873 0, 1874 buf, 1875 (DWORD)len, 1876 NULL); 1877 if (n > 3) { 1878 // Drop final '.', CR, LF 1879 if (buf[n - 1] == '\n') n--; 1880 if (buf[n - 1] == '\r') n--; 1881 if (buf[n - 1] == '.') n--; 1882 buf[n] = '\0'; 1883 } 1884 return n; 1885 } 1886 1887 if (errno != 0) { 1888 // C runtime error that has no corresponding DOS error code 1889 const char* s = strerror(errno); 1890 size_t n = strlen(s); 1891 if (n >= len) n = len - 1; 1892 strncpy(buf, s, n); 1893 buf[n] = '\0'; 1894 return n; 1895 } 1896 1897 return 0; 1898 } 1899 1900 int os::get_last_error() { 1901 DWORD error = GetLastError(); 1902 if (error == 0) { 1903 error = errno; 1904 } 1905 return (int)error; 1906 } 1907 1908 // sun.misc.Signal 1909 // NOTE that this is a workaround for an apparent kernel bug where if 1910 // a signal handler for SIGBREAK is installed then that signal handler 1911 // takes priority over the console control handler for CTRL_CLOSE_EVENT. 1912 // See bug 4416763. 1913 static void (*sigbreakHandler)(int) = NULL; 1914 1915 static void UserHandler(int sig, void *siginfo, void *context) { 1916 os::signal_notify(sig); 1917 // We need to reinstate the signal handler each time... 1918 os::signal(sig, (void*)UserHandler); 1919 } 1920 1921 void* os::user_handler() { 1922 return (void*) UserHandler; 1923 } 1924 1925 void* os::signal(int signal_number, void* handler) { 1926 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1927 void (*oldHandler)(int) = sigbreakHandler; 1928 sigbreakHandler = (void (*)(int)) handler; 1929 return (void*) oldHandler; 1930 } else { 1931 return (void*)::signal(signal_number, (void (*)(int))handler); 1932 } 1933 } 1934 1935 void os::signal_raise(int signal_number) { 1936 raise(signal_number); 1937 } 1938 1939 // The Win32 C runtime library maps all console control events other than ^C 1940 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1941 // logoff, and shutdown events. We therefore install our own console handler 1942 // that raises SIGTERM for the latter cases. 1943 // 1944 static BOOL WINAPI consoleHandler(DWORD event) { 1945 switch (event) { 1946 case CTRL_C_EVENT: 1947 if (is_error_reported()) { 1948 // Ctrl-C is pressed during error reporting, likely because the error 1949 // handler fails to abort. Let VM die immediately. 1950 os::die(); 1951 } 1952 1953 os::signal_raise(SIGINT); 1954 return TRUE; 1955 break; 1956 case CTRL_BREAK_EVENT: 1957 if (sigbreakHandler != NULL) { 1958 (*sigbreakHandler)(SIGBREAK); 1959 } 1960 return TRUE; 1961 break; 1962 case CTRL_LOGOFF_EVENT: { 1963 // Don't terminate JVM if it is running in a non-interactive session, 1964 // such as a service process. 1965 USEROBJECTFLAGS flags; 1966 HANDLE handle = GetProcessWindowStation(); 1967 if (handle != NULL && 1968 GetUserObjectInformation(handle, UOI_FLAGS, &flags, 1969 sizeof(USEROBJECTFLAGS), NULL)) { 1970 // If it is a non-interactive session, let next handler to deal 1971 // with it. 1972 if ((flags.dwFlags & WSF_VISIBLE) == 0) { 1973 return FALSE; 1974 } 1975 } 1976 } 1977 case CTRL_CLOSE_EVENT: 1978 case CTRL_SHUTDOWN_EVENT: 1979 os::signal_raise(SIGTERM); 1980 return TRUE; 1981 break; 1982 default: 1983 break; 1984 } 1985 return FALSE; 1986 } 1987 1988 // The following code is moved from os.cpp for making this 1989 // code platform specific, which it is by its very nature. 1990 1991 // Return maximum OS signal used + 1 for internal use only 1992 // Used as exit signal for signal_thread 1993 int os::sigexitnum_pd() { 1994 return NSIG; 1995 } 1996 1997 // a counter for each possible signal value, including signal_thread exit signal 1998 static volatile jint pending_signals[NSIG+1] = { 0 }; 1999 static HANDLE sig_sem = NULL; 2000 2001 void os::signal_init_pd() { 2002 // Initialize signal structures 2003 memset((void*)pending_signals, 0, sizeof(pending_signals)); 2004 2005 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 2006 2007 // Programs embedding the VM do not want it to attempt to receive 2008 // events like CTRL_LOGOFF_EVENT, which are used to implement the 2009 // shutdown hooks mechanism introduced in 1.3. For example, when 2010 // the VM is run as part of a Windows NT service (i.e., a servlet 2011 // engine in a web server), the correct behavior is for any console 2012 // control handler to return FALSE, not TRUE, because the OS's 2013 // "final" handler for such events allows the process to continue if 2014 // it is a service (while terminating it if it is not a service). 2015 // To make this behavior uniform and the mechanism simpler, we 2016 // completely disable the VM's usage of these console events if -Xrs 2017 // (=ReduceSignalUsage) is specified. This means, for example, that 2018 // the CTRL-BREAK thread dump mechanism is also disabled in this 2019 // case. See bugs 4323062, 4345157, and related bugs. 2020 2021 if (!ReduceSignalUsage) { 2022 // Add a CTRL-C handler 2023 SetConsoleCtrlHandler(consoleHandler, TRUE); 2024 } 2025 } 2026 2027 void os::signal_notify(int signal_number) { 2028 BOOL ret; 2029 if (sig_sem != NULL) { 2030 Atomic::inc(&pending_signals[signal_number]); 2031 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2032 assert(ret != 0, "ReleaseSemaphore() failed"); 2033 } 2034 } 2035 2036 static int check_pending_signals(bool wait_for_signal) { 2037 DWORD ret; 2038 while (true) { 2039 for (int i = 0; i < NSIG + 1; i++) { 2040 jint n = pending_signals[i]; 2041 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2042 return i; 2043 } 2044 } 2045 if (!wait_for_signal) { 2046 return -1; 2047 } 2048 2049 JavaThread *thread = JavaThread::current(); 2050 2051 ThreadBlockInVM tbivm(thread); 2052 2053 bool threadIsSuspended; 2054 do { 2055 thread->set_suspend_equivalent(); 2056 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2057 ret = ::WaitForSingleObject(sig_sem, INFINITE); 2058 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 2059 2060 // were we externally suspended while we were waiting? 2061 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2062 if (threadIsSuspended) { 2063 // The semaphore has been incremented, but while we were waiting 2064 // another thread suspended us. We don't want to continue running 2065 // while suspended because that would surprise the thread that 2066 // suspended us. 2067 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2068 assert(ret != 0, "ReleaseSemaphore() failed"); 2069 2070 thread->java_suspend_self(); 2071 } 2072 } while (threadIsSuspended); 2073 } 2074 } 2075 2076 int os::signal_lookup() { 2077 return check_pending_signals(false); 2078 } 2079 2080 int os::signal_wait() { 2081 return check_pending_signals(true); 2082 } 2083 2084 // Implicit OS exception handling 2085 2086 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, 2087 address handler) { 2088 JavaThread* thread = JavaThread::current(); 2089 // Save pc in thread 2090 #ifdef _M_IA64 2091 // Do not blow up if no thread info available. 2092 if (thread) { 2093 // Saving PRECISE pc (with slot information) in thread. 2094 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress; 2095 // Convert precise PC into "Unix" format 2096 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2); 2097 thread->set_saved_exception_pc((address)precise_pc); 2098 } 2099 // Set pc to handler 2100 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 2101 // Clear out psr.ri (= Restart Instruction) in order to continue 2102 // at the beginning of the target bundle. 2103 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF; 2104 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!"); 2105 #elif _M_AMD64 2106 // Do not blow up if no thread info available. 2107 if (thread) { 2108 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip); 2109 } 2110 // Set pc to handler 2111 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 2112 #else 2113 // Do not blow up if no thread info available. 2114 if (thread) { 2115 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip); 2116 } 2117 // Set pc to handler 2118 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler; 2119 #endif 2120 2121 // Continue the execution 2122 return EXCEPTION_CONTINUE_EXECUTION; 2123 } 2124 2125 2126 // Used for PostMortemDump 2127 extern "C" void safepoints(); 2128 extern "C" void find(int x); 2129 extern "C" void events(); 2130 2131 // According to Windows API documentation, an illegal instruction sequence should generate 2132 // the 0xC000001C exception code. However, real world experience shows that occasionnaly 2133 // the execution of an illegal instruction can generate the exception code 0xC000001E. This 2134 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 2135 2136 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 2137 2138 // From "Execution Protection in the Windows Operating System" draft 0.35 2139 // Once a system header becomes available, the "real" define should be 2140 // included or copied here. 2141 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2142 2143 // Handle NAT Bit consumption on IA64. 2144 #ifdef _M_IA64 2145 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION 2146 #endif 2147 2148 // Windows Vista/2008 heap corruption check 2149 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374 2150 2151 #define def_excpt(val) #val, val 2152 2153 struct siglabel { 2154 char *name; 2155 int number; 2156 }; 2157 2158 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual 2159 // C++ compiler contain this error code. Because this is a compiler-generated 2160 // error, the code is not listed in the Win32 API header files. 2161 // The code is actually a cryptic mnemonic device, with the initial "E" 2162 // standing for "exception" and the final 3 bytes (0x6D7363) representing the 2163 // ASCII values of "msc". 2164 2165 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363 2166 2167 2168 struct siglabel exceptlabels[] = { 2169 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2170 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2171 def_excpt(EXCEPTION_BREAKPOINT), 2172 def_excpt(EXCEPTION_SINGLE_STEP), 2173 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2174 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2175 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2176 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2177 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2178 def_excpt(EXCEPTION_FLT_OVERFLOW), 2179 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2180 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2181 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2182 def_excpt(EXCEPTION_INT_OVERFLOW), 2183 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2184 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2185 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2186 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2187 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2188 def_excpt(EXCEPTION_STACK_OVERFLOW), 2189 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2190 def_excpt(EXCEPTION_GUARD_PAGE), 2191 def_excpt(EXCEPTION_INVALID_HANDLE), 2192 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION), 2193 def_excpt(EXCEPTION_HEAP_CORRUPTION), 2194 #ifdef _M_IA64 2195 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION), 2196 #endif 2197 NULL, 0 2198 }; 2199 2200 const char* os::exception_name(int exception_code, char *buf, size_t size) { 2201 for (int i = 0; exceptlabels[i].name != NULL; i++) { 2202 if (exceptlabels[i].number == exception_code) { 2203 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2204 return buf; 2205 } 2206 } 2207 2208 return NULL; 2209 } 2210 2211 //----------------------------------------------------------------------------- 2212 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2213 // handle exception caused by idiv; should only happen for -MinInt/-1 2214 // (division by zero is handled explicitly) 2215 #ifdef _M_IA64 2216 assert(0, "Fix Handle_IDiv_Exception"); 2217 #elif _M_AMD64 2218 PCONTEXT ctx = exceptionInfo->ContextRecord; 2219 address pc = (address)ctx->Rip; 2220 assert(pc[0] == 0xF7, "not an idiv opcode"); 2221 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2222 assert(ctx->Rax == min_jint, "unexpected idiv exception"); 2223 // set correct result values and continue after idiv instruction 2224 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2225 ctx->Rax = (DWORD)min_jint; // result 2226 ctx->Rdx = (DWORD)0; // remainder 2227 // Continue the execution 2228 #else 2229 PCONTEXT ctx = exceptionInfo->ContextRecord; 2230 address pc = (address)ctx->Eip; 2231 assert(pc[0] == 0xF7, "not an idiv opcode"); 2232 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2233 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2234 // set correct result values and continue after idiv instruction 2235 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2236 ctx->Eax = (DWORD)min_jint; // result 2237 ctx->Edx = (DWORD)0; // remainder 2238 // Continue the execution 2239 #endif 2240 return EXCEPTION_CONTINUE_EXECUTION; 2241 } 2242 2243 //----------------------------------------------------------------------------- 2244 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2245 PCONTEXT ctx = exceptionInfo->ContextRecord; 2246 #ifndef _WIN64 2247 // handle exception caused by native method modifying control word 2248 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2249 2250 switch (exception_code) { 2251 case EXCEPTION_FLT_DENORMAL_OPERAND: 2252 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2253 case EXCEPTION_FLT_INEXACT_RESULT: 2254 case EXCEPTION_FLT_INVALID_OPERATION: 2255 case EXCEPTION_FLT_OVERFLOW: 2256 case EXCEPTION_FLT_STACK_CHECK: 2257 case EXCEPTION_FLT_UNDERFLOW: 2258 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2259 if (fp_control_word != ctx->FloatSave.ControlWord) { 2260 // Restore FPCW and mask out FLT exceptions 2261 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2262 // Mask out pending FLT exceptions 2263 ctx->FloatSave.StatusWord &= 0xffffff00; 2264 return EXCEPTION_CONTINUE_EXECUTION; 2265 } 2266 } 2267 2268 if (prev_uef_handler != NULL) { 2269 // We didn't handle this exception so pass it to the previous 2270 // UnhandledExceptionFilter. 2271 return (prev_uef_handler)(exceptionInfo); 2272 } 2273 #else // !_WIN64 2274 // On Windows, the mxcsr control bits are non-volatile across calls 2275 // See also CR 6192333 2276 // 2277 jint MxCsr = INITIAL_MXCSR; 2278 // we can't use StubRoutines::addr_mxcsr_std() 2279 // because in Win64 mxcsr is not saved there 2280 if (MxCsr != ctx->MxCsr) { 2281 ctx->MxCsr = MxCsr; 2282 return EXCEPTION_CONTINUE_EXECUTION; 2283 } 2284 #endif // !_WIN64 2285 2286 return EXCEPTION_CONTINUE_SEARCH; 2287 } 2288 2289 static inline void report_error(Thread* t, DWORD exception_code, 2290 address addr, void* siginfo, void* context) { 2291 VMError err(t, exception_code, addr, siginfo, context); 2292 err.report_and_die(); 2293 2294 // If UseOsErrorReporting, this will return here and save the error file 2295 // somewhere where we can find it in the minidump. 2296 } 2297 2298 //----------------------------------------------------------------------------- 2299 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2300 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2301 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2302 #ifdef _M_IA64 2303 // On Itanium, we need the "precise pc", which has the slot number coded 2304 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format). 2305 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress; 2306 // Convert the pc to "Unix format", which has the slot number coded 2307 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2 2308 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction" 2309 // information is saved in the Unix format. 2310 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2)); 2311 #elif _M_AMD64 2312 address pc = (address) exceptionInfo->ContextRecord->Rip; 2313 #else 2314 address pc = (address) exceptionInfo->ContextRecord->Eip; 2315 #endif 2316 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 2317 2318 // Handle SafeFetch32 and SafeFetchN exceptions. 2319 if (StubRoutines::is_safefetch_fault(pc)) { 2320 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc)); 2321 } 2322 2323 #ifndef _WIN64 2324 // Execution protection violation - win32 running on AMD64 only 2325 // Handled first to avoid misdiagnosis as a "normal" access violation; 2326 // This is safe to do because we have a new/unique ExceptionInformation 2327 // code for this condition. 2328 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2329 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2330 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2331 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2332 2333 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2334 int page_size = os::vm_page_size(); 2335 2336 // Make sure the pc and the faulting address are sane. 2337 // 2338 // If an instruction spans a page boundary, and the page containing 2339 // the beginning of the instruction is executable but the following 2340 // page is not, the pc and the faulting address might be slightly 2341 // different - we still want to unguard the 2nd page in this case. 2342 // 2343 // 15 bytes seems to be a (very) safe value for max instruction size. 2344 bool pc_is_near_addr = 2345 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2346 bool instr_spans_page_boundary = 2347 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2348 (intptr_t) page_size) > 0); 2349 2350 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2351 static volatile address last_addr = 2352 (address) os::non_memory_address_word(); 2353 2354 // In conservative mode, don't unguard unless the address is in the VM 2355 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2356 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2357 2358 // Set memory to RWX and retry 2359 address page_start = 2360 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2361 bool res = os::protect_memory((char*) page_start, page_size, 2362 os::MEM_PROT_RWX); 2363 2364 if (PrintMiscellaneous && Verbose) { 2365 char buf[256]; 2366 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 2367 "at " INTPTR_FORMAT 2368 ", unguarding " INTPTR_FORMAT ": %s", addr, 2369 page_start, (res ? "success" : strerror(errno))); 2370 tty->print_raw_cr(buf); 2371 } 2372 2373 // Set last_addr so if we fault again at the same address, we don't 2374 // end up in an endless loop. 2375 // 2376 // There are two potential complications here. Two threads trapping 2377 // at the same address at the same time could cause one of the 2378 // threads to think it already unguarded, and abort the VM. Likely 2379 // very rare. 2380 // 2381 // The other race involves two threads alternately trapping at 2382 // different addresses and failing to unguard the page, resulting in 2383 // an endless loop. This condition is probably even more unlikely 2384 // than the first. 2385 // 2386 // Although both cases could be avoided by using locks or thread 2387 // local last_addr, these solutions are unnecessary complication: 2388 // this handler is a best-effort safety net, not a complete solution. 2389 // It is disabled by default and should only be used as a workaround 2390 // in case we missed any no-execute-unsafe VM code. 2391 2392 last_addr = addr; 2393 2394 return EXCEPTION_CONTINUE_EXECUTION; 2395 } 2396 } 2397 2398 // Last unguard failed or not unguarding 2399 tty->print_raw_cr("Execution protection violation"); 2400 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2401 exceptionInfo->ContextRecord); 2402 return EXCEPTION_CONTINUE_SEARCH; 2403 } 2404 } 2405 #endif // _WIN64 2406 2407 // Check to see if we caught the safepoint code in the 2408 // process of write protecting the memory serialization page. 2409 // It write enables the page immediately after protecting it 2410 // so just return. 2411 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2412 JavaThread* thread = (JavaThread*) t; 2413 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2414 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2415 if (os::is_memory_serialize_page(thread, addr)) { 2416 // Block current thread until the memory serialize page permission restored. 2417 os::block_on_serialize_page_trap(); 2418 return EXCEPTION_CONTINUE_EXECUTION; 2419 } 2420 } 2421 2422 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) && 2423 VM_Version::is_cpuinfo_segv_addr(pc)) { 2424 // Verify that OS save/restore AVX registers. 2425 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr()); 2426 } 2427 2428 if (t != NULL && t->is_Java_thread()) { 2429 JavaThread* thread = (JavaThread*) t; 2430 bool in_java = thread->thread_state() == _thread_in_Java; 2431 2432 // Handle potential stack overflows up front. 2433 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2434 if (os::uses_stack_guard_pages()) { 2435 #ifdef _M_IA64 2436 // Use guard page for register stack. 2437 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2438 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2439 // Check for a register stack overflow on Itanium 2440 if (thread->addr_inside_register_stack_red_zone(addr)) { 2441 // Fatal red zone violation happens if the Java program 2442 // catches a StackOverflow error and does so much processing 2443 // that it runs beyond the unprotected yellow guard zone. As 2444 // a result, we are out of here. 2445 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit."); 2446 } else if(thread->addr_inside_register_stack(addr)) { 2447 // Disable the yellow zone which sets the state that 2448 // we've got a stack overflow problem. 2449 if (thread->stack_yellow_zone_enabled()) { 2450 thread->disable_stack_yellow_zone(); 2451 } 2452 // Give us some room to process the exception. 2453 thread->disable_register_stack_guard(); 2454 // Tracing with +Verbose. 2455 if (Verbose) { 2456 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc); 2457 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr); 2458 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base()); 2459 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]", 2460 thread->register_stack_base(), 2461 thread->register_stack_base() + thread->stack_size()); 2462 } 2463 2464 // Reguard the permanent register stack red zone just to be sure. 2465 // We saw Windows silently disabling this without telling us. 2466 thread->enable_register_stack_red_zone(); 2467 2468 return Handle_Exception(exceptionInfo, 2469 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2470 } 2471 #endif 2472 if (thread->stack_yellow_zone_enabled()) { 2473 // Yellow zone violation. The o/s has unprotected the first yellow 2474 // zone page for us. Note: must call disable_stack_yellow_zone to 2475 // update the enabled status, even if the zone contains only one page. 2476 thread->disable_stack_yellow_zone(); 2477 // If not in java code, return and hope for the best. 2478 return in_java 2479 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2480 : EXCEPTION_CONTINUE_EXECUTION; 2481 } else { 2482 // Fatal red zone violation. 2483 thread->disable_stack_red_zone(); 2484 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2485 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2486 exceptionInfo->ContextRecord); 2487 return EXCEPTION_CONTINUE_SEARCH; 2488 } 2489 } else if (in_java) { 2490 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2491 // a one-time-only guard page, which it has released to us. The next 2492 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2493 return Handle_Exception(exceptionInfo, 2494 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2495 } else { 2496 // Can only return and hope for the best. Further stack growth will 2497 // result in an ACCESS_VIOLATION. 2498 return EXCEPTION_CONTINUE_EXECUTION; 2499 } 2500 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2501 // Either stack overflow or null pointer exception. 2502 if (in_java) { 2503 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2504 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2505 address stack_end = thread->stack_base() - thread->stack_size(); 2506 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2507 // Stack overflow. 2508 assert(!os::uses_stack_guard_pages(), 2509 "should be caught by red zone code above."); 2510 return Handle_Exception(exceptionInfo, 2511 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2512 } 2513 // Check for safepoint polling and implicit null 2514 // We only expect null pointers in the stubs (vtable) 2515 // the rest are checked explicitly now. 2516 CodeBlob* cb = CodeCache::find_blob(pc); 2517 if (cb != NULL) { 2518 if (os::is_poll_address(addr)) { 2519 address stub = SharedRuntime::get_poll_stub(pc); 2520 return Handle_Exception(exceptionInfo, stub); 2521 } 2522 } 2523 { 2524 #ifdef _WIN64 2525 // If it's a legal stack address map the entire region in 2526 // 2527 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2528 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2529 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) { 2530 addr = (address)((uintptr_t)addr & 2531 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2532 os::commit_memory((char *)addr, thread->stack_base() - addr, 2533 !ExecMem); 2534 return EXCEPTION_CONTINUE_EXECUTION; 2535 } else 2536 #endif 2537 { 2538 // Null pointer exception. 2539 #ifdef _M_IA64 2540 // Process implicit null checks in compiled code. Note: Implicit null checks 2541 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs. 2542 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) { 2543 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format); 2544 // Handle implicit null check in UEP method entry 2545 if (cb && (cb->is_frame_complete_at(pc) || 2546 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) { 2547 if (Verbose) { 2548 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0); 2549 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format); 2550 tty->print_cr(" to addr " INTPTR_FORMAT, addr); 2551 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)", 2552 *(bundle_start + 1), *bundle_start); 2553 } 2554 return Handle_Exception(exceptionInfo, 2555 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL)); 2556 } 2557 } 2558 2559 // Implicit null checks were processed above. Hence, we should not reach 2560 // here in the usual case => die! 2561 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception"); 2562 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2563 exceptionInfo->ContextRecord); 2564 return EXCEPTION_CONTINUE_SEARCH; 2565 2566 #else // !IA64 2567 2568 // Windows 98 reports faulting addresses incorrectly 2569 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2570 !os::win32::is_nt()) { 2571 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2572 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2573 } 2574 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2575 exceptionInfo->ContextRecord); 2576 return EXCEPTION_CONTINUE_SEARCH; 2577 #endif 2578 } 2579 } 2580 } 2581 2582 #ifdef _WIN64 2583 // Special care for fast JNI field accessors. 2584 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2585 // in and the heap gets shrunk before the field access. 2586 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2587 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2588 if (addr != (address)-1) { 2589 return Handle_Exception(exceptionInfo, addr); 2590 } 2591 } 2592 #endif 2593 2594 // Stack overflow or null pointer exception in native code. 2595 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2596 exceptionInfo->ContextRecord); 2597 return EXCEPTION_CONTINUE_SEARCH; 2598 } // /EXCEPTION_ACCESS_VIOLATION 2599 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2600 #if defined _M_IA64 2601 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION || 2602 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) { 2603 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0); 2604 2605 // Compiled method patched to be non entrant? Following conditions must apply: 2606 // 1. must be first instruction in bundle 2607 // 2. must be a break instruction with appropriate code 2608 if ((((uint64_t) pc & 0x0F) == 0) && 2609 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) { 2610 return Handle_Exception(exceptionInfo, 2611 (address)SharedRuntime::get_handle_wrong_method_stub()); 2612 } 2613 } // /EXCEPTION_ILLEGAL_INSTRUCTION 2614 #endif 2615 2616 2617 if (in_java) { 2618 switch (exception_code) { 2619 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2620 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2621 2622 case EXCEPTION_INT_OVERFLOW: 2623 return Handle_IDiv_Exception(exceptionInfo); 2624 2625 } // switch 2626 } 2627 if (((thread->thread_state() == _thread_in_Java) || 2628 (thread->thread_state() == _thread_in_native)) && 2629 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) { 2630 LONG result=Handle_FLT_Exception(exceptionInfo); 2631 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2632 } 2633 } 2634 2635 if (exception_code != EXCEPTION_BREAKPOINT) { 2636 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2637 exceptionInfo->ContextRecord); 2638 } 2639 return EXCEPTION_CONTINUE_SEARCH; 2640 } 2641 2642 #ifndef _WIN64 2643 // Special care for fast JNI accessors. 2644 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2645 // the heap gets shrunk before the field access. 2646 // Need to install our own structured exception handler since native code may 2647 // install its own. 2648 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2649 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2650 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2651 address pc = (address) exceptionInfo->ContextRecord->Eip; 2652 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2653 if (addr != (address)-1) { 2654 return Handle_Exception(exceptionInfo, addr); 2655 } 2656 } 2657 return EXCEPTION_CONTINUE_SEARCH; 2658 } 2659 2660 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \ 2661 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \ 2662 jobject obj, \ 2663 jfieldID fieldID) { \ 2664 __try { \ 2665 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \ 2666 obj, \ 2667 fieldID); \ 2668 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \ 2669 _exception_info())) { \ 2670 } \ 2671 return 0; \ 2672 } 2673 2674 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2675 DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2676 DEFINE_FAST_GETFIELD(jchar, char, Char) 2677 DEFINE_FAST_GETFIELD(jshort, short, Short) 2678 DEFINE_FAST_GETFIELD(jint, int, Int) 2679 DEFINE_FAST_GETFIELD(jlong, long, Long) 2680 DEFINE_FAST_GETFIELD(jfloat, float, Float) 2681 DEFINE_FAST_GETFIELD(jdouble, double, Double) 2682 2683 address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2684 switch (type) { 2685 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2686 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2687 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2688 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2689 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2690 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2691 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2692 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2693 default: ShouldNotReachHere(); 2694 } 2695 return (address)-1; 2696 } 2697 #endif 2698 2699 void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) { 2700 // Install a win32 structured exception handler around the test 2701 // function call so the VM can generate an error dump if needed. 2702 __try { 2703 (*funcPtr)(); 2704 } __except(topLevelExceptionFilter( 2705 (_EXCEPTION_POINTERS*)_exception_info())) { 2706 // Nothing to do. 2707 } 2708 } 2709 2710 // Virtual Memory 2711 2712 int os::vm_page_size() { return os::win32::vm_page_size(); } 2713 int os::vm_allocation_granularity() { 2714 return os::win32::vm_allocation_granularity(); 2715 } 2716 2717 // Windows large page support is available on Windows 2003. In order to use 2718 // large page memory, the administrator must first assign additional privilege 2719 // to the user: 2720 // + select Control Panel -> Administrative Tools -> Local Security Policy 2721 // + select Local Policies -> User Rights Assignment 2722 // + double click "Lock pages in memory", add users and/or groups 2723 // + reboot 2724 // Note the above steps are needed for administrator as well, as administrators 2725 // by default do not have the privilege to lock pages in memory. 2726 // 2727 // Note about Windows 2003: although the API supports committing large page 2728 // memory on a page-by-page basis and VirtualAlloc() returns success under this 2729 // scenario, I found through experiment it only uses large page if the entire 2730 // memory region is reserved and committed in a single VirtualAlloc() call. 2731 // This makes Windows large page support more or less like Solaris ISM, in 2732 // that the entire heap must be committed upfront. This probably will change 2733 // in the future, if so the code below needs to be revisited. 2734 2735 #ifndef MEM_LARGE_PAGES 2736 #define MEM_LARGE_PAGES 0x20000000 2737 #endif 2738 2739 static HANDLE _hProcess; 2740 static HANDLE _hToken; 2741 2742 // Container for NUMA node list info 2743 class NUMANodeListHolder { 2744 private: 2745 int *_numa_used_node_list; // allocated below 2746 int _numa_used_node_count; 2747 2748 void free_node_list() { 2749 if (_numa_used_node_list != NULL) { 2750 FREE_C_HEAP_ARRAY(int, _numa_used_node_list); 2751 } 2752 } 2753 2754 public: 2755 NUMANodeListHolder() { 2756 _numa_used_node_count = 0; 2757 _numa_used_node_list = NULL; 2758 // do rest of initialization in build routine (after function pointers are set up) 2759 } 2760 2761 ~NUMANodeListHolder() { 2762 free_node_list(); 2763 } 2764 2765 bool build() { 2766 DWORD_PTR proc_aff_mask; 2767 DWORD_PTR sys_aff_mask; 2768 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false; 2769 ULONG highest_node_number; 2770 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false; 2771 free_node_list(); 2772 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal); 2773 for (unsigned int i = 0; i <= highest_node_number; i++) { 2774 ULONGLONG proc_mask_numa_node; 2775 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false; 2776 if ((proc_aff_mask & proc_mask_numa_node)!=0) { 2777 _numa_used_node_list[_numa_used_node_count++] = i; 2778 } 2779 } 2780 return (_numa_used_node_count > 1); 2781 } 2782 2783 int get_count() { return _numa_used_node_count; } 2784 int get_node_list_entry(int n) { 2785 // for indexes out of range, returns -1 2786 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1); 2787 } 2788 2789 } numa_node_list_holder; 2790 2791 2792 2793 static size_t _large_page_size = 0; 2794 2795 static bool resolve_functions_for_large_page_init() { 2796 return os::Kernel32Dll::GetLargePageMinimumAvailable() && 2797 os::Advapi32Dll::AdvapiAvailable(); 2798 } 2799 2800 static bool request_lock_memory_privilege() { 2801 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2802 os::current_process_id()); 2803 2804 LUID luid; 2805 if (_hProcess != NULL && 2806 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2807 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2808 2809 TOKEN_PRIVILEGES tp; 2810 tp.PrivilegeCount = 1; 2811 tp.Privileges[0].Luid = luid; 2812 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2813 2814 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2815 // privilege. Check GetLastError() too. See MSDN document. 2816 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2817 (GetLastError() == ERROR_SUCCESS)) { 2818 return true; 2819 } 2820 } 2821 2822 return false; 2823 } 2824 2825 static void cleanup_after_large_page_init() { 2826 if (_hProcess) CloseHandle(_hProcess); 2827 _hProcess = NULL; 2828 if (_hToken) CloseHandle(_hToken); 2829 _hToken = NULL; 2830 } 2831 2832 static bool numa_interleaving_init() { 2833 bool success = false; 2834 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving); 2835 2836 // print a warning if UseNUMAInterleaving flag is specified on command line 2837 bool warn_on_failure = use_numa_interleaving_specified; 2838 #define WARN(msg) if (warn_on_failure) { warning(msg); } 2839 2840 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages) 2841 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2842 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity); 2843 2844 if (os::Kernel32Dll::NumaCallsAvailable()) { 2845 if (numa_node_list_holder.build()) { 2846 if (PrintMiscellaneous && Verbose) { 2847 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count()); 2848 for (int i = 0; i < numa_node_list_holder.get_count(); i++) { 2849 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i)); 2850 } 2851 tty->print("\n"); 2852 } 2853 success = true; 2854 } else { 2855 WARN("Process does not cover multiple NUMA nodes."); 2856 } 2857 } else { 2858 WARN("NUMA Interleaving is not supported by the operating system."); 2859 } 2860 if (!success) { 2861 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag."); 2862 } 2863 return success; 2864 #undef WARN 2865 } 2866 2867 // this routine is used whenever we need to reserve a contiguous VA range 2868 // but we need to make separate VirtualAlloc calls for each piece of the range 2869 // Reasons for doing this: 2870 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise) 2871 // * UseNUMAInterleaving requires a separate node for each piece 2872 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, 2873 DWORD prot, 2874 bool should_inject_error = false) { 2875 char * p_buf; 2876 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size 2877 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2878 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size; 2879 2880 // first reserve enough address space in advance since we want to be 2881 // able to break a single contiguous virtual address range into multiple 2882 // large page commits but WS2003 does not allow reserving large page space 2883 // so we just use 4K pages for reserve, this gives us a legal contiguous 2884 // address space. then we will deallocate that reservation, and re alloc 2885 // using large pages 2886 const size_t size_of_reserve = bytes + chunk_size; 2887 if (bytes > size_of_reserve) { 2888 // Overflowed. 2889 return NULL; 2890 } 2891 p_buf = (char *) VirtualAlloc(addr, 2892 size_of_reserve, // size of Reserve 2893 MEM_RESERVE, 2894 PAGE_READWRITE); 2895 // If reservation failed, return NULL 2896 if (p_buf == NULL) return NULL; 2897 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC); 2898 os::release_memory(p_buf, bytes + chunk_size); 2899 2900 // we still need to round up to a page boundary (in case we are using large pages) 2901 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size) 2902 // instead we handle this in the bytes_to_rq computation below 2903 p_buf = (char *) align_size_up((size_t)p_buf, page_size); 2904 2905 // now go through and allocate one chunk at a time until all bytes are 2906 // allocated 2907 size_t bytes_remaining = bytes; 2908 // An overflow of align_size_up() would have been caught above 2909 // in the calculation of size_of_reserve. 2910 char * next_alloc_addr = p_buf; 2911 HANDLE hProc = GetCurrentProcess(); 2912 2913 #ifdef ASSERT 2914 // Variable for the failure injection 2915 long ran_num = os::random(); 2916 size_t fail_after = ran_num % bytes; 2917 #endif 2918 2919 int count=0; 2920 while (bytes_remaining) { 2921 // select bytes_to_rq to get to the next chunk_size boundary 2922 2923 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size)); 2924 // Note allocate and commit 2925 char * p_new; 2926 2927 #ifdef ASSERT 2928 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after); 2929 #else 2930 const bool inject_error_now = false; 2931 #endif 2932 2933 if (inject_error_now) { 2934 p_new = NULL; 2935 } else { 2936 if (!UseNUMAInterleaving) { 2937 p_new = (char *) VirtualAlloc(next_alloc_addr, 2938 bytes_to_rq, 2939 flags, 2940 prot); 2941 } else { 2942 // get the next node to use from the used_node_list 2943 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected"); 2944 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count()); 2945 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc, 2946 next_alloc_addr, 2947 bytes_to_rq, 2948 flags, 2949 prot, 2950 node); 2951 } 2952 } 2953 2954 if (p_new == NULL) { 2955 // Free any allocated pages 2956 if (next_alloc_addr > p_buf) { 2957 // Some memory was committed so release it. 2958 size_t bytes_to_release = bytes - bytes_remaining; 2959 // NMT has yet to record any individual blocks, so it 2960 // need to create a dummy 'reserve' record to match 2961 // the release. 2962 MemTracker::record_virtual_memory_reserve((address)p_buf, 2963 bytes_to_release, CALLER_PC); 2964 os::release_memory(p_buf, bytes_to_release); 2965 } 2966 #ifdef ASSERT 2967 if (should_inject_error) { 2968 if (TracePageSizes && Verbose) { 2969 tty->print_cr("Reserving pages individually failed."); 2970 } 2971 } 2972 #endif 2973 return NULL; 2974 } 2975 2976 bytes_remaining -= bytes_to_rq; 2977 next_alloc_addr += bytes_to_rq; 2978 count++; 2979 } 2980 // Although the memory is allocated individually, it is returned as one. 2981 // NMT records it as one block. 2982 if ((flags & MEM_COMMIT) != 0) { 2983 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC); 2984 } else { 2985 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC); 2986 } 2987 2988 // made it this far, success 2989 return p_buf; 2990 } 2991 2992 2993 2994 void os::large_page_init() { 2995 if (!UseLargePages) return; 2996 2997 // print a warning if any large page related flag is specified on command line 2998 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2999 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 3000 bool success = false; 3001 3002 #define WARN(msg) if (warn_on_failure) { warning(msg); } 3003 if (resolve_functions_for_large_page_init()) { 3004 if (request_lock_memory_privilege()) { 3005 size_t s = os::Kernel32Dll::GetLargePageMinimum(); 3006 if (s) { 3007 #if defined(IA32) || defined(AMD64) 3008 if (s > 4*M || LargePageSizeInBytes > 4*M) { 3009 WARN("JVM cannot use large pages bigger than 4mb."); 3010 } else { 3011 #endif 3012 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 3013 _large_page_size = LargePageSizeInBytes; 3014 } else { 3015 _large_page_size = s; 3016 } 3017 success = true; 3018 #if defined(IA32) || defined(AMD64) 3019 } 3020 #endif 3021 } else { 3022 WARN("Large page is not supported by the processor."); 3023 } 3024 } else { 3025 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 3026 } 3027 } else { 3028 WARN("Large page is not supported by the operating system."); 3029 } 3030 #undef WARN 3031 3032 const size_t default_page_size = (size_t) vm_page_size(); 3033 if (success && _large_page_size > default_page_size) { 3034 _page_sizes[0] = _large_page_size; 3035 _page_sizes[1] = default_page_size; 3036 _page_sizes[2] = 0; 3037 } 3038 3039 cleanup_after_large_page_init(); 3040 UseLargePages = success; 3041 } 3042 3043 // On win32, one cannot release just a part of reserved memory, it's an 3044 // all or nothing deal. When we split a reservation, we must break the 3045 // reservation into two reservations. 3046 void os::pd_split_reserved_memory(char *base, size_t size, size_t split, 3047 bool realloc) { 3048 if (size > 0) { 3049 release_memory(base, size); 3050 if (realloc) { 3051 reserve_memory(split, base); 3052 } 3053 if (size != split) { 3054 reserve_memory(size - split, base + split); 3055 } 3056 } 3057 } 3058 3059 // Multiple threads can race in this code but it's not possible to unmap small sections of 3060 // virtual space to get requested alignment, like posix-like os's. 3061 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe. 3062 char* os::reserve_memory_aligned(size_t size, size_t alignment) { 3063 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 3064 "Alignment must be a multiple of allocation granularity (page size)"); 3065 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 3066 3067 size_t extra_size = size + alignment; 3068 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 3069 3070 char* aligned_base = NULL; 3071 3072 do { 3073 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 3074 if (extra_base == NULL) { 3075 return NULL; 3076 } 3077 // Do manual alignment 3078 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 3079 3080 os::release_memory(extra_base, extra_size); 3081 3082 aligned_base = os::reserve_memory(size, aligned_base); 3083 3084 } while (aligned_base == NULL); 3085 3086 return aligned_base; 3087 } 3088 3089 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 3090 assert((size_t)addr % os::vm_allocation_granularity() == 0, 3091 "reserve alignment"); 3092 assert(bytes % os::vm_page_size() == 0, "reserve page size"); 3093 char* res; 3094 // note that if UseLargePages is on, all the areas that require interleaving 3095 // will go thru reserve_memory_special rather than thru here. 3096 bool use_individual = (UseNUMAInterleaving && !UseLargePages); 3097 if (!use_individual) { 3098 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 3099 } else { 3100 elapsedTimer reserveTimer; 3101 if (Verbose && PrintMiscellaneous) reserveTimer.start(); 3102 // in numa interleaving, we have to allocate pages individually 3103 // (well really chunks of NUMAInterleaveGranularity size) 3104 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE); 3105 if (res == NULL) { 3106 warning("NUMA page allocation failed"); 3107 } 3108 if (Verbose && PrintMiscellaneous) { 3109 reserveTimer.stop(); 3110 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes, 3111 reserveTimer.milliseconds(), reserveTimer.ticks()); 3112 } 3113 } 3114 assert(res == NULL || addr == NULL || addr == res, 3115 "Unexpected address from reserve."); 3116 3117 return res; 3118 } 3119 3120 // Reserve memory at an arbitrary address, only if that area is 3121 // available (and not reserved for something else). 3122 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3123 // Windows os::reserve_memory() fails of the requested address range is 3124 // not avilable. 3125 return reserve_memory(bytes, requested_addr); 3126 } 3127 3128 size_t os::large_page_size() { 3129 return _large_page_size; 3130 } 3131 3132 bool os::can_commit_large_page_memory() { 3133 // Windows only uses large page memory when the entire region is reserved 3134 // and committed in a single VirtualAlloc() call. This may change in the 3135 // future, but with Windows 2003 it's not possible to commit on demand. 3136 return false; 3137 } 3138 3139 bool os::can_execute_large_page_memory() { 3140 return true; 3141 } 3142 3143 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, 3144 bool exec) { 3145 assert(UseLargePages, "only for large pages"); 3146 3147 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { 3148 return NULL; // Fallback to small pages. 3149 } 3150 3151 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 3152 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3153 3154 // with large pages, there are two cases where we need to use Individual Allocation 3155 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003) 3156 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page 3157 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) { 3158 if (TracePageSizes && Verbose) { 3159 tty->print_cr("Reserving large pages individually."); 3160 } 3161 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError); 3162 if (p_buf == NULL) { 3163 // give an appropriate warning message 3164 if (UseNUMAInterleaving) { 3165 warning("NUMA large page allocation failed, UseLargePages flag ignored"); 3166 } 3167 if (UseLargePagesIndividualAllocation) { 3168 warning("Individually allocated large pages failed, " 3169 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 3170 } 3171 return NULL; 3172 } 3173 3174 return p_buf; 3175 3176 } else { 3177 if (TracePageSizes && Verbose) { 3178 tty->print_cr("Reserving large pages in a single large chunk."); 3179 } 3180 // normal policy just allocate it all at once 3181 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3182 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); 3183 if (res != NULL) { 3184 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC); 3185 } 3186 3187 return res; 3188 } 3189 } 3190 3191 bool os::release_memory_special(char* base, size_t bytes) { 3192 assert(base != NULL, "Sanity check"); 3193 return release_memory(base, bytes); 3194 } 3195 3196 void os::print_statistics() { 3197 } 3198 3199 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) { 3200 int err = os::get_last_error(); 3201 char buf[256]; 3202 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3203 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 3204 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3205 exec, buf_len != 0 ? buf : "<no_error_string>", err); 3206 } 3207 3208 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 3209 if (bytes == 0) { 3210 // Don't bother the OS with noops. 3211 return true; 3212 } 3213 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 3214 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 3215 // Don't attempt to print anything if the OS call fails. We're 3216 // probably low on resources, so the print itself may cause crashes. 3217 3218 // unless we have NUMAInterleaving enabled, the range of a commit 3219 // is always within a reserve covered by a single VirtualAlloc 3220 // in that case we can just do a single commit for the requested size 3221 if (!UseNUMAInterleaving) { 3222 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) { 3223 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3224 return false; 3225 } 3226 if (exec) { 3227 DWORD oldprot; 3228 // Windows doc says to use VirtualProtect to get execute permissions 3229 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) { 3230 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3231 return false; 3232 } 3233 } 3234 return true; 3235 } else { 3236 3237 // when NUMAInterleaving is enabled, the commit might cover a range that 3238 // came from multiple VirtualAlloc reserves (using allocate_pages_individually). 3239 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery 3240 // returns represents the number of bytes that can be committed in one step. 3241 size_t bytes_remaining = bytes; 3242 char * next_alloc_addr = addr; 3243 while (bytes_remaining > 0) { 3244 MEMORY_BASIC_INFORMATION alloc_info; 3245 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info)); 3246 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3247 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, 3248 PAGE_READWRITE) == NULL) { 3249 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3250 exec);) 3251 return false; 3252 } 3253 if (exec) { 3254 DWORD oldprot; 3255 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, 3256 PAGE_EXECUTE_READWRITE, &oldprot)) { 3257 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3258 exec);) 3259 return false; 3260 } 3261 } 3262 bytes_remaining -= bytes_to_rq; 3263 next_alloc_addr += bytes_to_rq; 3264 } 3265 } 3266 // if we made it this far, return true 3267 return true; 3268 } 3269 3270 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 3271 bool exec) { 3272 // alignment_hint is ignored on this OS 3273 return pd_commit_memory(addr, size, exec); 3274 } 3275 3276 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 3277 const char* mesg) { 3278 assert(mesg != NULL, "mesg must be specified"); 3279 if (!pd_commit_memory(addr, size, exec)) { 3280 warn_fail_commit_memory(addr, size, exec); 3281 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); 3282 } 3283 } 3284 3285 void os::pd_commit_memory_or_exit(char* addr, size_t size, 3286 size_t alignment_hint, bool exec, 3287 const char* mesg) { 3288 // alignment_hint is ignored on this OS 3289 pd_commit_memory_or_exit(addr, size, exec, mesg); 3290 } 3291 3292 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3293 if (bytes == 0) { 3294 // Don't bother the OS with noops. 3295 return true; 3296 } 3297 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 3298 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 3299 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0); 3300 } 3301 3302 bool os::pd_release_memory(char* addr, size_t bytes) { 3303 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 3304 } 3305 3306 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 3307 return os::commit_memory(addr, size, !ExecMem); 3308 } 3309 3310 bool os::remove_stack_guard_pages(char* addr, size_t size) { 3311 return os::uncommit_memory(addr, size); 3312 } 3313 3314 // Set protections specified 3315 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3316 bool is_committed) { 3317 unsigned int p = 0; 3318 switch (prot) { 3319 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 3320 case MEM_PROT_READ: p = PAGE_READONLY; break; 3321 case MEM_PROT_RW: p = PAGE_READWRITE; break; 3322 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 3323 default: 3324 ShouldNotReachHere(); 3325 } 3326 3327 DWORD old_status; 3328 3329 // Strange enough, but on Win32 one can change protection only for committed 3330 // memory, not a big deal anyway, as bytes less or equal than 64K 3331 if (!is_committed) { 3332 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX, 3333 "cannot commit protection page"); 3334 } 3335 // One cannot use os::guard_memory() here, as on Win32 guard page 3336 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 3337 // 3338 // Pages in the region become guard pages. Any attempt to access a guard page 3339 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 3340 // the guard page status. Guard pages thus act as a one-time access alarm. 3341 return VirtualProtect(addr, bytes, p, &old_status) != 0; 3342 } 3343 3344 bool os::guard_memory(char* addr, size_t bytes) { 3345 DWORD old_status; 3346 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 3347 } 3348 3349 bool os::unguard_memory(char* addr, size_t bytes) { 3350 DWORD old_status; 3351 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 3352 } 3353 3354 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3355 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3356 void os::numa_make_global(char *addr, size_t bytes) { } 3357 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 3358 bool os::numa_topology_changed() { return false; } 3359 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); } 3360 int os::numa_get_group_id() { return 0; } 3361 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 3362 if (numa_node_list_holder.get_count() == 0 && size > 0) { 3363 // Provide an answer for UMA systems 3364 ids[0] = 0; 3365 return 1; 3366 } else { 3367 // check for size bigger than actual groups_num 3368 size = MIN2(size, numa_get_groups_num()); 3369 for (int i = 0; i < (int)size; i++) { 3370 ids[i] = numa_node_list_holder.get_node_list_entry(i); 3371 } 3372 return size; 3373 } 3374 } 3375 3376 bool os::get_page_info(char *start, page_info* info) { 3377 return false; 3378 } 3379 3380 char *os::scan_pages(char *start, char* end, page_info* page_expected, 3381 page_info* page_found) { 3382 return end; 3383 } 3384 3385 char* os::non_memory_address_word() { 3386 // Must never look like an address returned by reserve_memory, 3387 // even in its subfields (as defined by the CPU immediate fields, 3388 // if the CPU splits constants across multiple instructions). 3389 return (char*)-1; 3390 } 3391 3392 #define MAX_ERROR_COUNT 100 3393 #define SYS_THREAD_ERROR 0xffffffffUL 3394 3395 void os::pd_start_thread(Thread* thread) { 3396 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 3397 // Returns previous suspend state: 3398 // 0: Thread was not suspended 3399 // 1: Thread is running now 3400 // >1: Thread is still suspended. 3401 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3402 } 3403 3404 class HighResolutionInterval : public CHeapObj<mtThread> { 3405 // The default timer resolution seems to be 10 milliseconds. 3406 // (Where is this written down?) 3407 // If someone wants to sleep for only a fraction of the default, 3408 // then we set the timer resolution down to 1 millisecond for 3409 // the duration of their interval. 3410 // We carefully set the resolution back, since otherwise we 3411 // seem to incur an overhead (3%?) that we don't need. 3412 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 3413 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 3414 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 3415 // timeBeginPeriod() if the relative error exceeded some threshold. 3416 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 3417 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 3418 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 3419 // resolution timers running. 3420 private: 3421 jlong resolution; 3422 public: 3423 HighResolutionInterval(jlong ms) { 3424 resolution = ms % 10L; 3425 if (resolution != 0) { 3426 MMRESULT result = timeBeginPeriod(1L); 3427 } 3428 } 3429 ~HighResolutionInterval() { 3430 if (resolution != 0) { 3431 MMRESULT result = timeEndPeriod(1L); 3432 } 3433 resolution = 0L; 3434 } 3435 }; 3436 3437 int os::sleep(Thread* thread, jlong ms, bool interruptable) { 3438 jlong limit = (jlong) MAXDWORD; 3439 3440 while (ms > limit) { 3441 int res; 3442 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) { 3443 return res; 3444 } 3445 ms -= limit; 3446 } 3447 3448 assert(thread == Thread::current(), "thread consistency check"); 3449 OSThread* osthread = thread->osthread(); 3450 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 3451 int result; 3452 if (interruptable) { 3453 assert(thread->is_Java_thread(), "must be java thread"); 3454 JavaThread *jt = (JavaThread *) thread; 3455 ThreadBlockInVM tbivm(jt); 3456 3457 jt->set_suspend_equivalent(); 3458 // cleared by handle_special_suspend_equivalent_condition() or 3459 // java_suspend_self() via check_and_wait_while_suspended() 3460 3461 HANDLE events[1]; 3462 events[0] = osthread->interrupt_event(); 3463 HighResolutionInterval *phri=NULL; 3464 if (!ForceTimeHighResolution) { 3465 phri = new HighResolutionInterval(ms); 3466 } 3467 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 3468 result = OS_TIMEOUT; 3469 } else { 3470 ResetEvent(osthread->interrupt_event()); 3471 osthread->set_interrupted(false); 3472 result = OS_INTRPT; 3473 } 3474 delete phri; //if it is NULL, harmless 3475 3476 // were we externally suspended while we were waiting? 3477 jt->check_and_wait_while_suspended(); 3478 } else { 3479 assert(!thread->is_Java_thread(), "must not be java thread"); 3480 Sleep((long) ms); 3481 result = OS_TIMEOUT; 3482 } 3483 return result; 3484 } 3485 3486 // Short sleep, direct OS call. 3487 // 3488 // ms = 0, means allow others (if any) to run. 3489 // 3490 void os::naked_short_sleep(jlong ms) { 3491 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3492 Sleep(ms); 3493 } 3494 3495 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3496 void os::infinite_sleep() { 3497 while (true) { // sleep forever ... 3498 Sleep(100000); // ... 100 seconds at a time 3499 } 3500 } 3501 3502 typedef BOOL (WINAPI * STTSignature)(void); 3503 3504 void os::naked_yield() { 3505 // Use either SwitchToThread() or Sleep(0) 3506 // Consider passing back the return value from SwitchToThread(). 3507 if (os::Kernel32Dll::SwitchToThreadAvailable()) { 3508 SwitchToThread(); 3509 } else { 3510 Sleep(0); 3511 } 3512 } 3513 3514 // Win32 only gives you access to seven real priorities at a time, 3515 // so we compress Java's ten down to seven. It would be better 3516 // if we dynamically adjusted relative priorities. 3517 3518 int os::java_to_os_priority[CriticalPriority + 1] = { 3519 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3520 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3521 THREAD_PRIORITY_LOWEST, // 2 3522 THREAD_PRIORITY_BELOW_NORMAL, // 3 3523 THREAD_PRIORITY_BELOW_NORMAL, // 4 3524 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3525 THREAD_PRIORITY_NORMAL, // 6 3526 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3527 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3528 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3529 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority 3530 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority 3531 }; 3532 3533 int prio_policy1[CriticalPriority + 1] = { 3534 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3535 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3536 THREAD_PRIORITY_LOWEST, // 2 3537 THREAD_PRIORITY_BELOW_NORMAL, // 3 3538 THREAD_PRIORITY_BELOW_NORMAL, // 4 3539 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3540 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3541 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3542 THREAD_PRIORITY_HIGHEST, // 8 3543 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3544 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority 3545 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority 3546 }; 3547 3548 static int prio_init() { 3549 // If ThreadPriorityPolicy is 1, switch tables 3550 if (ThreadPriorityPolicy == 1) { 3551 int i; 3552 for (i = 0; i < CriticalPriority + 1; i++) { 3553 os::java_to_os_priority[i] = prio_policy1[i]; 3554 } 3555 } 3556 if (UseCriticalJavaThreadPriority) { 3557 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 3558 } 3559 return 0; 3560 } 3561 3562 OSReturn os::set_native_priority(Thread* thread, int priority) { 3563 if (!UseThreadPriorities) return OS_OK; 3564 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3565 return ret ? OS_OK : OS_ERR; 3566 } 3567 3568 OSReturn os::get_native_priority(const Thread* const thread, 3569 int* priority_ptr) { 3570 if (!UseThreadPriorities) { 3571 *priority_ptr = java_to_os_priority[NormPriority]; 3572 return OS_OK; 3573 } 3574 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3575 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3576 assert(false, "GetThreadPriority failed"); 3577 return OS_ERR; 3578 } 3579 *priority_ptr = os_prio; 3580 return OS_OK; 3581 } 3582 3583 3584 // Hint to the underlying OS that a task switch would not be good. 3585 // Void return because it's a hint and can fail. 3586 void os::hint_no_preempt() {} 3587 3588 void os::interrupt(Thread* thread) { 3589 assert(!thread->is_Java_thread() || Thread::current() == thread || 3590 Threads_lock->owned_by_self(), 3591 "possibility of dangling Thread pointer"); 3592 3593 OSThread* osthread = thread->osthread(); 3594 osthread->set_interrupted(true); 3595 // More than one thread can get here with the same value of osthread, 3596 // resulting in multiple notifications. We do, however, want the store 3597 // to interrupted() to be visible to other threads before we post 3598 // the interrupt event. 3599 OrderAccess::release(); 3600 SetEvent(osthread->interrupt_event()); 3601 // For JSR166: unpark after setting status 3602 if (thread->is_Java_thread()) { 3603 ((JavaThread*)thread)->parker()->unpark(); 3604 } 3605 3606 ParkEvent * ev = thread->_ParkEvent; 3607 if (ev != NULL) ev->unpark(); 3608 } 3609 3610 3611 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3612 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3613 "possibility of dangling Thread pointer"); 3614 3615 OSThread* osthread = thread->osthread(); 3616 // There is no synchronization between the setting of the interrupt 3617 // and it being cleared here. It is critical - see 6535709 - that 3618 // we only clear the interrupt state, and reset the interrupt event, 3619 // if we are going to report that we were indeed interrupted - else 3620 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups 3621 // depending on the timing. By checking thread interrupt event to see 3622 // if the thread gets real interrupt thus prevent spurious wakeup. 3623 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0); 3624 if (interrupted && clear_interrupted) { 3625 osthread->set_interrupted(false); 3626 ResetEvent(osthread->interrupt_event()); 3627 } // Otherwise leave the interrupted state alone 3628 3629 return interrupted; 3630 } 3631 3632 // Get's a pc (hint) for a running thread. Currently used only for profiling. 3633 ExtendedPC os::get_thread_pc(Thread* thread) { 3634 CONTEXT context; 3635 context.ContextFlags = CONTEXT_CONTROL; 3636 HANDLE handle = thread->osthread()->thread_handle(); 3637 #ifdef _M_IA64 3638 assert(0, "Fix get_thread_pc"); 3639 return ExtendedPC(NULL); 3640 #else 3641 if (GetThreadContext(handle, &context)) { 3642 #ifdef _M_AMD64 3643 return ExtendedPC((address) context.Rip); 3644 #else 3645 return ExtendedPC((address) context.Eip); 3646 #endif 3647 } else { 3648 return ExtendedPC(NULL); 3649 } 3650 #endif 3651 } 3652 3653 // GetCurrentThreadId() returns DWORD 3654 intx os::current_thread_id() { return GetCurrentThreadId(); } 3655 3656 static int _initial_pid = 0; 3657 3658 int os::current_process_id() { 3659 return (_initial_pid ? _initial_pid : _getpid()); 3660 } 3661 3662 int os::win32::_vm_page_size = 0; 3663 int os::win32::_vm_allocation_granularity = 0; 3664 int os::win32::_processor_type = 0; 3665 // Processor level is not available on non-NT systems, use vm_version instead 3666 int os::win32::_processor_level = 0; 3667 julong os::win32::_physical_memory = 0; 3668 size_t os::win32::_default_stack_size = 0; 3669 3670 intx os::win32::_os_thread_limit = 0; 3671 volatile intx os::win32::_os_thread_count = 0; 3672 3673 bool os::win32::_is_nt = false; 3674 bool os::win32::_is_windows_2003 = false; 3675 bool os::win32::_is_windows_server = false; 3676 3677 // 6573254 3678 // Currently, the bug is observed across all the supported Windows releases, 3679 // including the latest one (as of this writing - Windows Server 2012 R2) 3680 bool os::win32::_has_exit_bug = true; 3681 bool os::win32::_has_performance_count = 0; 3682 3683 void os::win32::initialize_system_info() { 3684 SYSTEM_INFO si; 3685 GetSystemInfo(&si); 3686 _vm_page_size = si.dwPageSize; 3687 _vm_allocation_granularity = si.dwAllocationGranularity; 3688 _processor_type = si.dwProcessorType; 3689 _processor_level = si.wProcessorLevel; 3690 set_processor_count(si.dwNumberOfProcessors); 3691 3692 MEMORYSTATUSEX ms; 3693 ms.dwLength = sizeof(ms); 3694 3695 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3696 // dwMemoryLoad (% of memory in use) 3697 GlobalMemoryStatusEx(&ms); 3698 _physical_memory = ms.ullTotalPhys; 3699 3700 OSVERSIONINFOEX oi; 3701 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 3702 GetVersionEx((OSVERSIONINFO*)&oi); 3703 switch (oi.dwPlatformId) { 3704 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 3705 case VER_PLATFORM_WIN32_NT: 3706 _is_nt = true; 3707 { 3708 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3709 if (os_vers == 5002) { 3710 _is_windows_2003 = true; 3711 } 3712 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER || 3713 oi.wProductType == VER_NT_SERVER) { 3714 _is_windows_server = true; 3715 } 3716 } 3717 break; 3718 default: fatal("Unknown platform"); 3719 } 3720 3721 _default_stack_size = os::current_stack_size(); 3722 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3723 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3724 "stack size not a multiple of page size"); 3725 3726 initialize_performance_counter(); 3727 3728 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is 3729 // known to deadlock the system, if the VM issues to thread operations with 3730 // a too high frequency, e.g., such as changing the priorities. 3731 // The 6000 seems to work well - no deadlocks has been notices on the test 3732 // programs that we have seen experience this problem. 3733 if (!os::win32::is_nt()) { 3734 StarvationMonitorInterval = 6000; 3735 } 3736 } 3737 3738 3739 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, 3740 int ebuflen) { 3741 char path[MAX_PATH]; 3742 DWORD size; 3743 DWORD pathLen = (DWORD)sizeof(path); 3744 HINSTANCE result = NULL; 3745 3746 // only allow library name without path component 3747 assert(strchr(name, '\\') == NULL, "path not allowed"); 3748 assert(strchr(name, ':') == NULL, "path not allowed"); 3749 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) { 3750 jio_snprintf(ebuf, ebuflen, 3751 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name); 3752 return NULL; 3753 } 3754 3755 // search system directory 3756 if ((size = GetSystemDirectory(path, pathLen)) > 0) { 3757 if (size >= pathLen) { 3758 return NULL; // truncated 3759 } 3760 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3761 return NULL; // truncated 3762 } 3763 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3764 return result; 3765 } 3766 } 3767 3768 // try Windows directory 3769 if ((size = GetWindowsDirectory(path, pathLen)) > 0) { 3770 if (size >= pathLen) { 3771 return NULL; // truncated 3772 } 3773 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3774 return NULL; // truncated 3775 } 3776 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3777 return result; 3778 } 3779 } 3780 3781 jio_snprintf(ebuf, ebuflen, 3782 "os::win32::load_windows_dll() cannot load %s from system directories.", name); 3783 return NULL; 3784 } 3785 3786 #define EXIT_TIMEOUT PRODUCT_ONLY(1000) NOT_PRODUCT(4000) /* 1 sec in product, 4 sec in debug */ 3787 3788 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) { 3789 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect); 3790 return TRUE; 3791 } 3792 3793 int os::win32::exit_process_or_thread(Ept what, int exit_code) { 3794 // Basic approach: 3795 // - Each exiting thread registers its intent to exit and then does so. 3796 // - A thread trying to terminate the process must wait for all 3797 // threads currently exiting to complete their exit. 3798 3799 if (os::win32::has_exit_bug()) { 3800 // The array holds handles of the threads that have started exiting by calling 3801 // _endthreadex(). 3802 // Should be large enough to avoid blocking the exiting thread due to lack of 3803 // a free slot. 3804 static HANDLE handles[MAXIMUM_WAIT_OBJECTS]; 3805 static int handle_count = 0; 3806 3807 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT; 3808 static CRITICAL_SECTION crit_sect; 3809 static volatile jint process_exiting = 0; 3810 int i, j; 3811 DWORD res; 3812 HANDLE hproc, hthr; 3813 3814 // The first thread that reached this point, initializes the critical section. 3815 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) { 3816 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__); 3817 } else if (OrderAccess::load_acquire(&process_exiting) == 0) { 3818 EnterCriticalSection(&crit_sect); 3819 3820 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) { 3821 // Remove from the array those handles of the threads that have completed exiting. 3822 for (i = 0, j = 0; i < handle_count; ++i) { 3823 res = WaitForSingleObject(handles[i], 0 /* don't wait */); 3824 if (res == WAIT_TIMEOUT) { 3825 handles[j++] = handles[i]; 3826 } else { 3827 if (res == WAIT_FAILED) { 3828 warning("WaitForSingleObject failed (%u) in %s: %d\n", 3829 GetLastError(), __FILE__, __LINE__); 3830 } 3831 // Don't keep the handle, if we failed waiting for it. 3832 CloseHandle(handles[i]); 3833 } 3834 } 3835 3836 // If there's no free slot in the array of the kept handles, we'll have to 3837 // wait until at least one thread completes exiting. 3838 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) { 3839 // Raise the priority of the oldest exiting thread to increase its chances 3840 // to complete sooner. 3841 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL); 3842 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT); 3843 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) { 3844 i = (res - WAIT_OBJECT_0); 3845 handle_count = MAXIMUM_WAIT_OBJECTS - 1; 3846 for (; i < handle_count; ++i) { 3847 handles[i] = handles[i + 1]; 3848 } 3849 } else { 3850 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3851 (res == WAIT_FAILED ? "failed" : "timed out"), 3852 GetLastError(), __FILE__, __LINE__); 3853 // Don't keep handles, if we failed waiting for them. 3854 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) { 3855 CloseHandle(handles[i]); 3856 } 3857 handle_count = 0; 3858 } 3859 } 3860 3861 // Store a duplicate of the current thread handle in the array of handles. 3862 hproc = GetCurrentProcess(); 3863 hthr = GetCurrentThread(); 3864 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count], 3865 0, FALSE, DUPLICATE_SAME_ACCESS)) { 3866 warning("DuplicateHandle failed (%u) in %s: %d\n", 3867 GetLastError(), __FILE__, __LINE__); 3868 } else { 3869 ++handle_count; 3870 } 3871 3872 // The current exiting thread has stored its handle in the array, and now 3873 // should leave the critical section before calling _endthreadex(). 3874 3875 } else if (what != EPT_THREAD) { 3876 if (handle_count > 0) { 3877 // Before ending the process, make sure all the threads that had called 3878 // _endthreadex() completed. 3879 3880 // Set the priority level of the current thread to the same value as 3881 // the priority level of exiting threads. 3882 // This is to ensure it will be given a fair chance to execute if 3883 // the timeout expires. 3884 hthr = GetCurrentThread(); 3885 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL); 3886 for (i = 0; i < handle_count; ++i) { 3887 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL); 3888 } 3889 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT); 3890 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) { 3891 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3892 (res == WAIT_FAILED ? "failed" : "timed out"), 3893 GetLastError(), __FILE__, __LINE__); 3894 } 3895 for (i = 0; i < handle_count; ++i) { 3896 CloseHandle(handles[i]); 3897 } 3898 handle_count = 0; 3899 } 3900 3901 OrderAccess::release_store(&process_exiting, 1); 3902 } 3903 3904 LeaveCriticalSection(&crit_sect); 3905 } 3906 3907 if (what == EPT_THREAD) { 3908 while (OrderAccess::load_acquire(&process_exiting) != 0) { 3909 // Some other thread is about to call exit(), so we 3910 // don't let the current thread proceed to _endthreadex() 3911 SuspendThread(GetCurrentThread()); 3912 // Avoid busy-wait loop, if SuspendThread() failed. 3913 Sleep(EXIT_TIMEOUT); 3914 } 3915 } 3916 } 3917 3918 // We are here if either 3919 // - there's no 'race at exit' bug on this OS release; 3920 // - initialization of the critical section failed (unlikely); 3921 // - the current thread has stored its handle and left the critical section; 3922 // - the process-exiting thread has raised the flag and left the critical section. 3923 if (what == EPT_THREAD) { 3924 _endthreadex((unsigned)exit_code); 3925 } else if (what == EPT_PROCESS) { 3926 ::exit(exit_code); 3927 } else { 3928 _exit(exit_code); 3929 } 3930 3931 // Should not reach here 3932 return exit_code; 3933 } 3934 3935 #undef EXIT_TIMEOUT 3936 3937 void os::win32::setmode_streams() { 3938 _setmode(_fileno(stdin), _O_BINARY); 3939 _setmode(_fileno(stdout), _O_BINARY); 3940 _setmode(_fileno(stderr), _O_BINARY); 3941 } 3942 3943 3944 bool os::is_debugger_attached() { 3945 return IsDebuggerPresent() ? true : false; 3946 } 3947 3948 3949 void os::wait_for_keypress_at_exit(void) { 3950 if (PauseAtExit) { 3951 fprintf(stderr, "Press any key to continue...\n"); 3952 fgetc(stdin); 3953 } 3954 } 3955 3956 3957 int os::message_box(const char* title, const char* message) { 3958 int result = MessageBox(NULL, message, title, 3959 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 3960 return result == IDYES; 3961 } 3962 3963 int os::allocate_thread_local_storage() { 3964 return TlsAlloc(); 3965 } 3966 3967 3968 void os::free_thread_local_storage(int index) { 3969 TlsFree(index); 3970 } 3971 3972 3973 void os::thread_local_storage_at_put(int index, void* value) { 3974 TlsSetValue(index, value); 3975 assert(thread_local_storage_at(index) == value, "Just checking"); 3976 } 3977 3978 3979 void* os::thread_local_storage_at(int index) { 3980 return TlsGetValue(index); 3981 } 3982 3983 3984 #ifndef PRODUCT 3985 #ifndef _WIN64 3986 // Helpers to check whether NX protection is enabled 3987 int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 3988 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 3989 pex->ExceptionRecord->NumberParameters > 0 && 3990 pex->ExceptionRecord->ExceptionInformation[0] == 3991 EXCEPTION_INFO_EXEC_VIOLATION) { 3992 return EXCEPTION_EXECUTE_HANDLER; 3993 } 3994 return EXCEPTION_CONTINUE_SEARCH; 3995 } 3996 3997 void nx_check_protection() { 3998 // If NX is enabled we'll get an exception calling into code on the stack 3999 char code[] = { (char)0xC3 }; // ret 4000 void *code_ptr = (void *)code; 4001 __try { 4002 __asm call code_ptr 4003 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 4004 tty->print_raw_cr("NX protection detected."); 4005 } 4006 } 4007 #endif // _WIN64 4008 #endif // PRODUCT 4009 4010 // this is called _before_ the global arguments have been parsed 4011 void os::init(void) { 4012 _initial_pid = _getpid(); 4013 4014 init_random(1234567); 4015 4016 win32::initialize_system_info(); 4017 win32::setmode_streams(); 4018 init_page_sizes((size_t) win32::vm_page_size()); 4019 4020 // This may be overridden later when argument processing is done. 4021 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, 4022 os::win32::is_windows_2003()); 4023 4024 // Initialize main_process and main_thread 4025 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 4026 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 4027 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 4028 fatal("DuplicateHandle failed\n"); 4029 } 4030 main_thread_id = (int) GetCurrentThreadId(); 4031 } 4032 4033 // To install functions for atexit processing 4034 extern "C" { 4035 static void perfMemory_exit_helper() { 4036 perfMemory_exit(); 4037 } 4038 } 4039 4040 static jint initSock(); 4041 4042 // this is called _after_ the global arguments have been parsed 4043 jint os::init_2(void) { 4044 // Allocate a single page and mark it as readable for safepoint polling 4045 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 4046 guarantee(polling_page != NULL, "Reserve Failed for polling page"); 4047 4048 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 4049 guarantee(return_page != NULL, "Commit Failed for polling page"); 4050 4051 os::set_polling_page(polling_page); 4052 4053 #ifndef PRODUCT 4054 if (Verbose && PrintMiscellaneous) { 4055 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", 4056 (intptr_t)polling_page); 4057 } 4058 #endif 4059 4060 if (!UseMembar) { 4061 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE); 4062 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 4063 4064 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE); 4065 guarantee(return_page != NULL, "Commit Failed for memory serialize page"); 4066 4067 os::set_memory_serialize_page(mem_serialize_page); 4068 4069 #ifndef PRODUCT 4070 if (Verbose && PrintMiscellaneous) { 4071 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", 4072 (intptr_t)mem_serialize_page); 4073 } 4074 #endif 4075 } 4076 4077 // Setup Windows Exceptions 4078 4079 // for debugging float code generation bugs 4080 if (ForceFloatExceptions) { 4081 #ifndef _WIN64 4082 static long fp_control_word = 0; 4083 __asm { fstcw fp_control_word } 4084 // see Intel PPro Manual, Vol. 2, p 7-16 4085 const long precision = 0x20; 4086 const long underflow = 0x10; 4087 const long overflow = 0x08; 4088 const long zero_div = 0x04; 4089 const long denorm = 0x02; 4090 const long invalid = 0x01; 4091 fp_control_word |= invalid; 4092 __asm { fldcw fp_control_word } 4093 #endif 4094 } 4095 4096 // If stack_commit_size is 0, windows will reserve the default size, 4097 // but only commit a small portion of it. 4098 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 4099 size_t default_reserve_size = os::win32::default_stack_size(); 4100 size_t actual_reserve_size = stack_commit_size; 4101 if (stack_commit_size < default_reserve_size) { 4102 // If stack_commit_size == 0, we want this too 4103 actual_reserve_size = default_reserve_size; 4104 } 4105 4106 // Check minimum allowable stack size for thread creation and to initialize 4107 // the java system classes, including StackOverflowError - depends on page 4108 // size. Add a page for compiler2 recursion in main thread. 4109 // Add in 2*BytesPerWord times page size to account for VM stack during 4110 // class initialization depending on 32 or 64 bit VM. 4111 size_t min_stack_allowed = 4112 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 4113 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size(); 4114 if (actual_reserve_size < min_stack_allowed) { 4115 tty->print_cr("\nThe stack size specified is too small, " 4116 "Specify at least %dk", 4117 min_stack_allowed / K); 4118 return JNI_ERR; 4119 } 4120 4121 JavaThread::set_stack_size_at_create(stack_commit_size); 4122 4123 // Calculate theoretical max. size of Threads to guard gainst artifical 4124 // out-of-memory situations, where all available address-space has been 4125 // reserved by thread stacks. 4126 assert(actual_reserve_size != 0, "Must have a stack"); 4127 4128 // Calculate the thread limit when we should start doing Virtual Memory 4129 // banging. Currently when the threads will have used all but 200Mb of space. 4130 // 4131 // TODO: consider performing a similar calculation for commit size instead 4132 // as reserve size, since on a 64-bit platform we'll run into that more 4133 // often than running out of virtual memory space. We can use the 4134 // lower value of the two calculations as the os_thread_limit. 4135 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 4136 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 4137 4138 // at exit methods are called in the reverse order of their registration. 4139 // there is no limit to the number of functions registered. atexit does 4140 // not set errno. 4141 4142 if (PerfAllowAtExitRegistration) { 4143 // only register atexit functions if PerfAllowAtExitRegistration is set. 4144 // atexit functions can be delayed until process exit time, which 4145 // can be problematic for embedded VM situations. Embedded VMs should 4146 // call DestroyJavaVM() to assure that VM resources are released. 4147 4148 // note: perfMemory_exit_helper atexit function may be removed in 4149 // the future if the appropriate cleanup code can be added to the 4150 // VM_Exit VMOperation's doit method. 4151 if (atexit(perfMemory_exit_helper) != 0) { 4152 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 4153 } 4154 } 4155 4156 #ifndef _WIN64 4157 // Print something if NX is enabled (win32 on AMD64) 4158 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 4159 #endif 4160 4161 // initialize thread priority policy 4162 prio_init(); 4163 4164 if (UseNUMA && !ForceNUMA) { 4165 UseNUMA = false; // We don't fully support this yet 4166 } 4167 4168 if (UseNUMAInterleaving) { 4169 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag 4170 bool success = numa_interleaving_init(); 4171 if (!success) UseNUMAInterleaving = false; 4172 } 4173 4174 if (initSock() != JNI_OK) { 4175 return JNI_ERR; 4176 } 4177 4178 return JNI_OK; 4179 } 4180 4181 // Mark the polling page as unreadable 4182 void os::make_polling_page_unreadable(void) { 4183 DWORD old_status; 4184 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4185 PAGE_NOACCESS, &old_status)) { 4186 fatal("Could not disable polling page"); 4187 } 4188 } 4189 4190 // Mark the polling page as readable 4191 void os::make_polling_page_readable(void) { 4192 DWORD old_status; 4193 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4194 PAGE_READONLY, &old_status)) { 4195 fatal("Could not enable polling page"); 4196 } 4197 } 4198 4199 4200 int os::stat(const char *path, struct stat *sbuf) { 4201 char pathbuf[MAX_PATH]; 4202 if (strlen(path) > MAX_PATH - 1) { 4203 errno = ENAMETOOLONG; 4204 return -1; 4205 } 4206 os::native_path(strcpy(pathbuf, path)); 4207 int ret = ::stat(pathbuf, sbuf); 4208 if (sbuf != NULL && UseUTCFileTimestamp) { 4209 // Fix for 6539723. st_mtime returned from stat() is dependent on 4210 // the system timezone and so can return different values for the 4211 // same file if/when daylight savings time changes. This adjustment 4212 // makes sure the same timestamp is returned regardless of the TZ. 4213 // 4214 // See: 4215 // http://msdn.microsoft.com/library/ 4216 // default.asp?url=/library/en-us/sysinfo/base/ 4217 // time_zone_information_str.asp 4218 // and 4219 // http://msdn.microsoft.com/library/default.asp?url= 4220 // /library/en-us/sysinfo/base/settimezoneinformation.asp 4221 // 4222 // NOTE: there is a insidious bug here: If the timezone is changed 4223 // after the call to stat() but before 'GetTimeZoneInformation()', then 4224 // the adjustment we do here will be wrong and we'll return the wrong 4225 // value (which will likely end up creating an invalid class data 4226 // archive). Absent a better API for this, or some time zone locking 4227 // mechanism, we'll have to live with this risk. 4228 TIME_ZONE_INFORMATION tz; 4229 DWORD tzid = GetTimeZoneInformation(&tz); 4230 int daylightBias = 4231 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 4232 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 4233 } 4234 return ret; 4235 } 4236 4237 4238 #define FT2INT64(ft) \ 4239 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 4240 4241 4242 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4243 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4244 // of a thread. 4245 // 4246 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4247 // the fast estimate available on the platform. 4248 4249 // current_thread_cpu_time() is not optimized for Windows yet 4250 jlong os::current_thread_cpu_time() { 4251 // return user + sys since the cost is the same 4252 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 4253 } 4254 4255 jlong os::thread_cpu_time(Thread* thread) { 4256 // consistent with what current_thread_cpu_time() returns. 4257 return os::thread_cpu_time(thread, true /* user+sys */); 4258 } 4259 4260 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4261 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4262 } 4263 4264 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 4265 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 4266 // If this function changes, os::is_thread_cpu_time_supported() should too 4267 if (os::win32::is_nt()) { 4268 FILETIME CreationTime; 4269 FILETIME ExitTime; 4270 FILETIME KernelTime; 4271 FILETIME UserTime; 4272 4273 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime, 4274 &ExitTime, &KernelTime, &UserTime) == 0) { 4275 return -1; 4276 } else if (user_sys_cpu_time) { 4277 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 4278 } else { 4279 return FT2INT64(UserTime) * 100; 4280 } 4281 } else { 4282 return (jlong) timeGetTime() * 1000000; 4283 } 4284 } 4285 4286 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4287 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4288 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4289 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4290 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4291 } 4292 4293 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4294 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4295 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4296 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4297 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4298 } 4299 4300 bool os::is_thread_cpu_time_supported() { 4301 // see os::thread_cpu_time 4302 if (os::win32::is_nt()) { 4303 FILETIME CreationTime; 4304 FILETIME ExitTime; 4305 FILETIME KernelTime; 4306 FILETIME UserTime; 4307 4308 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime, 4309 &KernelTime, &UserTime) == 0) { 4310 return false; 4311 } else { 4312 return true; 4313 } 4314 } else { 4315 return false; 4316 } 4317 } 4318 4319 // Windows does't provide a loadavg primitive so this is stubbed out for now. 4320 // It does have primitives (PDH API) to get CPU usage and run queue length. 4321 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 4322 // If we wanted to implement loadavg on Windows, we have a few options: 4323 // 4324 // a) Query CPU usage and run queue length and "fake" an answer by 4325 // returning the CPU usage if it's under 100%, and the run queue 4326 // length otherwise. It turns out that querying is pretty slow 4327 // on Windows, on the order of 200 microseconds on a fast machine. 4328 // Note that on the Windows the CPU usage value is the % usage 4329 // since the last time the API was called (and the first call 4330 // returns 100%), so we'd have to deal with that as well. 4331 // 4332 // b) Sample the "fake" answer using a sampling thread and store 4333 // the answer in a global variable. The call to loadavg would 4334 // just return the value of the global, avoiding the slow query. 4335 // 4336 // c) Sample a better answer using exponential decay to smooth the 4337 // value. This is basically the algorithm used by UNIX kernels. 4338 // 4339 // Note that sampling thread starvation could affect both (b) and (c). 4340 int os::loadavg(double loadavg[], int nelem) { 4341 return -1; 4342 } 4343 4344 4345 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 4346 bool os::dont_yield() { 4347 return DontYieldALot; 4348 } 4349 4350 // This method is a slightly reworked copy of JDK's sysOpen 4351 // from src/windows/hpi/src/sys_api_md.c 4352 4353 int os::open(const char *path, int oflag, int mode) { 4354 char pathbuf[MAX_PATH]; 4355 4356 if (strlen(path) > MAX_PATH - 1) { 4357 errno = ENAMETOOLONG; 4358 return -1; 4359 } 4360 os::native_path(strcpy(pathbuf, path)); 4361 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 4362 } 4363 4364 FILE* os::open(int fd, const char* mode) { 4365 return ::_fdopen(fd, mode); 4366 } 4367 4368 // Is a (classpath) directory empty? 4369 bool os::dir_is_empty(const char* path) { 4370 WIN32_FIND_DATA fd; 4371 HANDLE f = FindFirstFile(path, &fd); 4372 if (f == INVALID_HANDLE_VALUE) { 4373 return true; 4374 } 4375 FindClose(f); 4376 return false; 4377 } 4378 4379 // create binary file, rewriting existing file if required 4380 int os::create_binary_file(const char* path, bool rewrite_existing) { 4381 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 4382 if (!rewrite_existing) { 4383 oflags |= _O_EXCL; 4384 } 4385 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 4386 } 4387 4388 // return current position of file pointer 4389 jlong os::current_file_offset(int fd) { 4390 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 4391 } 4392 4393 // move file pointer to the specified offset 4394 jlong os::seek_to_file_offset(int fd, jlong offset) { 4395 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 4396 } 4397 4398 4399 jlong os::lseek(int fd, jlong offset, int whence) { 4400 return (jlong) ::_lseeki64(fd, offset, whence); 4401 } 4402 4403 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 4404 OVERLAPPED ov; 4405 DWORD nread; 4406 BOOL result; 4407 4408 ZeroMemory(&ov, sizeof(ov)); 4409 ov.Offset = (DWORD)offset; 4410 ov.OffsetHigh = (DWORD)(offset >> 32); 4411 4412 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4413 4414 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov); 4415 4416 return result ? nread : 0; 4417 } 4418 4419 4420 // This method is a slightly reworked copy of JDK's sysNativePath 4421 // from src/windows/hpi/src/path_md.c 4422 4423 // Convert a pathname to native format. On win32, this involves forcing all 4424 // separators to be '\\' rather than '/' (both are legal inputs, but Win95 4425 // sometimes rejects '/') and removing redundant separators. The input path is 4426 // assumed to have been converted into the character encoding used by the local 4427 // system. Because this might be a double-byte encoding, care is taken to 4428 // treat double-byte lead characters correctly. 4429 // 4430 // This procedure modifies the given path in place, as the result is never 4431 // longer than the original. There is no error return; this operation always 4432 // succeeds. 4433 char * os::native_path(char *path) { 4434 char *src = path, *dst = path, *end = path; 4435 char *colon = NULL; // If a drive specifier is found, this will 4436 // point to the colon following the drive letter 4437 4438 // Assumption: '/', '\\', ':', and drive letters are never lead bytes 4439 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\')) 4440 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte"); 4441 4442 // Check for leading separators 4443 #define isfilesep(c) ((c) == '/' || (c) == '\\') 4444 while (isfilesep(*src)) { 4445 src++; 4446 } 4447 4448 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 4449 // Remove leading separators if followed by drive specifier. This 4450 // hack is necessary to support file URLs containing drive 4451 // specifiers (e.g., "file://c:/path"). As a side effect, 4452 // "/c:/path" can be used as an alternative to "c:/path". 4453 *dst++ = *src++; 4454 colon = dst; 4455 *dst++ = ':'; 4456 src++; 4457 } else { 4458 src = path; 4459 if (isfilesep(src[0]) && isfilesep(src[1])) { 4460 // UNC pathname: Retain first separator; leave src pointed at 4461 // second separator so that further separators will be collapsed 4462 // into the second separator. The result will be a pathname 4463 // beginning with "\\\\" followed (most likely) by a host name. 4464 src = dst = path + 1; 4465 path[0] = '\\'; // Force first separator to '\\' 4466 } 4467 } 4468 4469 end = dst; 4470 4471 // Remove redundant separators from remainder of path, forcing all 4472 // separators to be '\\' rather than '/'. Also, single byte space 4473 // characters are removed from the end of the path because those 4474 // are not legal ending characters on this operating system. 4475 // 4476 while (*src != '\0') { 4477 if (isfilesep(*src)) { 4478 *dst++ = '\\'; src++; 4479 while (isfilesep(*src)) src++; 4480 if (*src == '\0') { 4481 // Check for trailing separator 4482 end = dst; 4483 if (colon == dst - 2) break; // "z:\\" 4484 if (dst == path + 1) break; // "\\" 4485 if (dst == path + 2 && isfilesep(path[0])) { 4486 // "\\\\" is not collapsed to "\\" because "\\\\" marks the 4487 // beginning of a UNC pathname. Even though it is not, by 4488 // itself, a valid UNC pathname, we leave it as is in order 4489 // to be consistent with the path canonicalizer as well 4490 // as the win32 APIs, which treat this case as an invalid 4491 // UNC pathname rather than as an alias for the root 4492 // directory of the current drive. 4493 break; 4494 } 4495 end = --dst; // Path does not denote a root directory, so 4496 // remove trailing separator 4497 break; 4498 } 4499 end = dst; 4500 } else { 4501 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character 4502 *dst++ = *src++; 4503 if (*src) *dst++ = *src++; 4504 end = dst; 4505 } else { // Copy a single-byte character 4506 char c = *src++; 4507 *dst++ = c; 4508 // Space is not a legal ending character 4509 if (c != ' ') end = dst; 4510 } 4511 } 4512 } 4513 4514 *end = '\0'; 4515 4516 // For "z:", add "." to work around a bug in the C runtime library 4517 if (colon == dst - 1) { 4518 path[2] = '.'; 4519 path[3] = '\0'; 4520 } 4521 4522 return path; 4523 } 4524 4525 // This code is a copy of JDK's sysSetLength 4526 // from src/windows/hpi/src/sys_api_md.c 4527 4528 int os::ftruncate(int fd, jlong length) { 4529 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4530 long high = (long)(length >> 32); 4531 DWORD ret; 4532 4533 if (h == (HANDLE)(-1)) { 4534 return -1; 4535 } 4536 4537 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 4538 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 4539 return -1; 4540 } 4541 4542 if (::SetEndOfFile(h) == FALSE) { 4543 return -1; 4544 } 4545 4546 return 0; 4547 } 4548 4549 4550 // This code is a copy of JDK's sysSync 4551 // from src/windows/hpi/src/sys_api_md.c 4552 // except for the legacy workaround for a bug in Win 98 4553 4554 int os::fsync(int fd) { 4555 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 4556 4557 if ((!::FlushFileBuffers(handle)) && 4558 (GetLastError() != ERROR_ACCESS_DENIED)) { 4559 // from winerror.h 4560 return -1; 4561 } 4562 return 0; 4563 } 4564 4565 static int nonSeekAvailable(int, long *); 4566 static int stdinAvailable(int, long *); 4567 4568 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR) 4569 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO) 4570 4571 // This code is a copy of JDK's sysAvailable 4572 // from src/windows/hpi/src/sys_api_md.c 4573 4574 int os::available(int fd, jlong *bytes) { 4575 jlong cur, end; 4576 struct _stati64 stbuf64; 4577 4578 if (::_fstati64(fd, &stbuf64) >= 0) { 4579 int mode = stbuf64.st_mode; 4580 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 4581 int ret; 4582 long lpbytes; 4583 if (fd == 0) { 4584 ret = stdinAvailable(fd, &lpbytes); 4585 } else { 4586 ret = nonSeekAvailable(fd, &lpbytes); 4587 } 4588 (*bytes) = (jlong)(lpbytes); 4589 return ret; 4590 } 4591 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 4592 return FALSE; 4593 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 4594 return FALSE; 4595 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 4596 return FALSE; 4597 } 4598 *bytes = end - cur; 4599 return TRUE; 4600 } else { 4601 return FALSE; 4602 } 4603 } 4604 4605 // This code is a copy of JDK's nonSeekAvailable 4606 // from src/windows/hpi/src/sys_api_md.c 4607 4608 static int nonSeekAvailable(int fd, long *pbytes) { 4609 // This is used for available on non-seekable devices 4610 // (like both named and anonymous pipes, such as pipes 4611 // connected to an exec'd process). 4612 // Standard Input is a special case. 4613 HANDLE han; 4614 4615 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 4616 return FALSE; 4617 } 4618 4619 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 4620 // PeekNamedPipe fails when at EOF. In that case we 4621 // simply make *pbytes = 0 which is consistent with the 4622 // behavior we get on Solaris when an fd is at EOF. 4623 // The only alternative is to raise an Exception, 4624 // which isn't really warranted. 4625 // 4626 if (::GetLastError() != ERROR_BROKEN_PIPE) { 4627 return FALSE; 4628 } 4629 *pbytes = 0; 4630 } 4631 return TRUE; 4632 } 4633 4634 #define MAX_INPUT_EVENTS 2000 4635 4636 // This code is a copy of JDK's stdinAvailable 4637 // from src/windows/hpi/src/sys_api_md.c 4638 4639 static int stdinAvailable(int fd, long *pbytes) { 4640 HANDLE han; 4641 DWORD numEventsRead = 0; // Number of events read from buffer 4642 DWORD numEvents = 0; // Number of events in buffer 4643 DWORD i = 0; // Loop index 4644 DWORD curLength = 0; // Position marker 4645 DWORD actualLength = 0; // Number of bytes readable 4646 BOOL error = FALSE; // Error holder 4647 INPUT_RECORD *lpBuffer; // Pointer to records of input events 4648 4649 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4650 return FALSE; 4651 } 4652 4653 // Construct an array of input records in the console buffer 4654 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4655 if (error == 0) { 4656 return nonSeekAvailable(fd, pbytes); 4657 } 4658 4659 // lpBuffer must fit into 64K or else PeekConsoleInput fails 4660 if (numEvents > MAX_INPUT_EVENTS) { 4661 numEvents = MAX_INPUT_EVENTS; 4662 } 4663 4664 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal); 4665 if (lpBuffer == NULL) { 4666 return FALSE; 4667 } 4668 4669 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4670 if (error == 0) { 4671 os::free(lpBuffer); 4672 return FALSE; 4673 } 4674 4675 // Examine input records for the number of bytes available 4676 for (i=0; i<numEvents; i++) { 4677 if (lpBuffer[i].EventType == KEY_EVENT) { 4678 4679 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4680 &(lpBuffer[i].Event); 4681 if (keyRecord->bKeyDown == TRUE) { 4682 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4683 curLength++; 4684 if (*keyPressed == '\r') { 4685 actualLength = curLength; 4686 } 4687 } 4688 } 4689 } 4690 4691 if (lpBuffer != NULL) { 4692 os::free(lpBuffer); 4693 } 4694 4695 *pbytes = (long) actualLength; 4696 return TRUE; 4697 } 4698 4699 // Map a block of memory. 4700 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4701 char *addr, size_t bytes, bool read_only, 4702 bool allow_exec) { 4703 HANDLE hFile; 4704 char* base; 4705 4706 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4707 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4708 if (hFile == NULL) { 4709 if (PrintMiscellaneous && Verbose) { 4710 DWORD err = GetLastError(); 4711 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err); 4712 } 4713 return NULL; 4714 } 4715 4716 if (allow_exec) { 4717 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4718 // unless it comes from a PE image (which the shared archive is not.) 4719 // Even VirtualProtect refuses to give execute access to mapped memory 4720 // that was not previously executable. 4721 // 4722 // Instead, stick the executable region in anonymous memory. Yuck. 4723 // Penalty is that ~4 pages will not be shareable - in the future 4724 // we might consider DLLizing the shared archive with a proper PE 4725 // header so that mapping executable + sharing is possible. 4726 4727 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4728 PAGE_READWRITE); 4729 if (base == NULL) { 4730 if (PrintMiscellaneous && Verbose) { 4731 DWORD err = GetLastError(); 4732 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 4733 } 4734 CloseHandle(hFile); 4735 return NULL; 4736 } 4737 4738 DWORD bytes_read; 4739 OVERLAPPED overlapped; 4740 overlapped.Offset = (DWORD)file_offset; 4741 overlapped.OffsetHigh = 0; 4742 overlapped.hEvent = NULL; 4743 // ReadFile guarantees that if the return value is true, the requested 4744 // number of bytes were read before returning. 4745 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 4746 if (!res) { 4747 if (PrintMiscellaneous && Verbose) { 4748 DWORD err = GetLastError(); 4749 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 4750 } 4751 release_memory(base, bytes); 4752 CloseHandle(hFile); 4753 return NULL; 4754 } 4755 } else { 4756 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 4757 NULL /* file_name */); 4758 if (hMap == NULL) { 4759 if (PrintMiscellaneous && Verbose) { 4760 DWORD err = GetLastError(); 4761 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err); 4762 } 4763 CloseHandle(hFile); 4764 return NULL; 4765 } 4766 4767 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 4768 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 4769 (DWORD)bytes, addr); 4770 if (base == NULL) { 4771 if (PrintMiscellaneous && Verbose) { 4772 DWORD err = GetLastError(); 4773 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 4774 } 4775 CloseHandle(hMap); 4776 CloseHandle(hFile); 4777 return NULL; 4778 } 4779 4780 if (CloseHandle(hMap) == 0) { 4781 if (PrintMiscellaneous && Verbose) { 4782 DWORD err = GetLastError(); 4783 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 4784 } 4785 CloseHandle(hFile); 4786 return base; 4787 } 4788 } 4789 4790 if (allow_exec) { 4791 DWORD old_protect; 4792 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 4793 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 4794 4795 if (!res) { 4796 if (PrintMiscellaneous && Verbose) { 4797 DWORD err = GetLastError(); 4798 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 4799 } 4800 // Don't consider this a hard error, on IA32 even if the 4801 // VirtualProtect fails, we should still be able to execute 4802 CloseHandle(hFile); 4803 return base; 4804 } 4805 } 4806 4807 if (CloseHandle(hFile) == 0) { 4808 if (PrintMiscellaneous && Verbose) { 4809 DWORD err = GetLastError(); 4810 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 4811 } 4812 return base; 4813 } 4814 4815 return base; 4816 } 4817 4818 4819 // Remap a block of memory. 4820 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4821 char *addr, size_t bytes, bool read_only, 4822 bool allow_exec) { 4823 // This OS does not allow existing memory maps to be remapped so we 4824 // have to unmap the memory before we remap it. 4825 if (!os::unmap_memory(addr, bytes)) { 4826 return NULL; 4827 } 4828 4829 // There is a very small theoretical window between the unmap_memory() 4830 // call above and the map_memory() call below where a thread in native 4831 // code may be able to access an address that is no longer mapped. 4832 4833 return os::map_memory(fd, file_name, file_offset, addr, bytes, 4834 read_only, allow_exec); 4835 } 4836 4837 4838 // Unmap a block of memory. 4839 // Returns true=success, otherwise false. 4840 4841 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4842 BOOL result = UnmapViewOfFile(addr); 4843 if (result == 0) { 4844 if (PrintMiscellaneous && Verbose) { 4845 DWORD err = GetLastError(); 4846 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 4847 } 4848 return false; 4849 } 4850 return true; 4851 } 4852 4853 void os::pause() { 4854 char filename[MAX_PATH]; 4855 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4856 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4857 } else { 4858 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4859 } 4860 4861 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4862 if (fd != -1) { 4863 struct stat buf; 4864 ::close(fd); 4865 while (::stat(filename, &buf) == 0) { 4866 Sleep(100); 4867 } 4868 } else { 4869 jio_fprintf(stderr, 4870 "Could not open pause file '%s', continuing immediately.\n", filename); 4871 } 4872 } 4873 4874 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 4875 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 4876 } 4877 4878 // See the caveats for this class in os_windows.hpp 4879 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back 4880 // into this method and returns false. If no OS EXCEPTION was raised, returns 4881 // true. 4882 // The callback is supposed to provide the method that should be protected. 4883 // 4884 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 4885 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); 4886 assert(!WatcherThread::watcher_thread()->has_crash_protection(), 4887 "crash_protection already set?"); 4888 4889 bool success = true; 4890 __try { 4891 WatcherThread::watcher_thread()->set_crash_protection(this); 4892 cb.call(); 4893 } __except(EXCEPTION_EXECUTE_HANDLER) { 4894 // only for protection, nothing to do 4895 success = false; 4896 } 4897 WatcherThread::watcher_thread()->set_crash_protection(NULL); 4898 return success; 4899 } 4900 4901 // An Event wraps a win32 "CreateEvent" kernel handle. 4902 // 4903 // We have a number of choices regarding "CreateEvent" win32 handle leakage: 4904 // 4905 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 4906 // field, and call CloseHandle() on the win32 event handle. Unpark() would 4907 // need to be modified to tolerate finding a NULL (invalid) win32 event handle. 4908 // In addition, an unpark() operation might fetch the handle field, but the 4909 // event could recycle between the fetch and the SetEvent() operation. 4910 // SetEvent() would either fail because the handle was invalid, or inadvertently work, 4911 // as the win32 handle value had been recycled. In an ideal world calling SetEvent() 4912 // on an stale but recycled handle would be harmless, but in practice this might 4913 // confuse other non-Sun code, so it's not a viable approach. 4914 // 4915 // 2: Once a win32 event handle is associated with an Event, it remains associated 4916 // with the Event. The event handle is never closed. This could be construed 4917 // as handle leakage, but only up to the maximum # of threads that have been extant 4918 // at any one time. This shouldn't be an issue, as windows platforms typically 4919 // permit a process to have hundreds of thousands of open handles. 4920 // 4921 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 4922 // and release unused handles. 4923 // 4924 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 4925 // It's not clear, however, that we wouldn't be trading one type of leak for another. 4926 // 4927 // 5. Use an RCU-like mechanism (Read-Copy Update). 4928 // Or perhaps something similar to Maged Michael's "Hazard pointers". 4929 // 4930 // We use (2). 4931 // 4932 // TODO-FIXME: 4933 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 4934 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 4935 // to recover from (or at least detect) the dreaded Windows 841176 bug. 4936 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 4937 // into a single win32 CreateEvent() handle. 4938 // 4939 // Assumption: 4940 // Only one parker can exist on an event, which is why we allocate 4941 // them per-thread. Multiple unparkers can coexist. 4942 // 4943 // _Event transitions in park() 4944 // -1 => -1 : illegal 4945 // 1 => 0 : pass - return immediately 4946 // 0 => -1 : block; then set _Event to 0 before returning 4947 // 4948 // _Event transitions in unpark() 4949 // 0 => 1 : just return 4950 // 1 => 1 : just return 4951 // -1 => either 0 or 1; must signal target thread 4952 // That is, we can safely transition _Event from -1 to either 4953 // 0 or 1. 4954 // 4955 // _Event serves as a restricted-range semaphore. 4956 // -1 : thread is blocked, i.e. there is a waiter 4957 // 0 : neutral: thread is running or ready, 4958 // could have been signaled after a wait started 4959 // 1 : signaled - thread is running or ready 4960 // 4961 // Another possible encoding of _Event would be with 4962 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 4963 // 4964 4965 int os::PlatformEvent::park(jlong Millis) { 4966 // Transitions for _Event: 4967 // -1 => -1 : illegal 4968 // 1 => 0 : pass - return immediately 4969 // 0 => -1 : block; then set _Event to 0 before returning 4970 4971 guarantee(_ParkHandle != NULL , "Invariant"); 4972 guarantee(Millis > 0 , "Invariant"); 4973 4974 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 4975 // the initial park() operation. 4976 // Consider: use atomic decrement instead of CAS-loop 4977 4978 int v; 4979 for (;;) { 4980 v = _Event; 4981 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4982 } 4983 guarantee((v == 0) || (v == 1), "invariant"); 4984 if (v != 0) return OS_OK; 4985 4986 // Do this the hard way by blocking ... 4987 // TODO: consider a brief spin here, gated on the success of recent 4988 // spin attempts by this thread. 4989 // 4990 // We decompose long timeouts into series of shorter timed waits. 4991 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 4992 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 4993 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 4994 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 4995 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 4996 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 4997 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 4998 // for the already waited time. This policy does not admit any new outcomes. 4999 // In the future, however, we might want to track the accumulated wait time and 5000 // adjust Millis accordingly if we encounter a spurious wakeup. 5001 5002 const int MAXTIMEOUT = 0x10000000; 5003 DWORD rv = WAIT_TIMEOUT; 5004 while (_Event < 0 && Millis > 0) { 5005 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT) 5006 if (Millis > MAXTIMEOUT) { 5007 prd = MAXTIMEOUT; 5008 } 5009 rv = ::WaitForSingleObject(_ParkHandle, prd); 5010 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed"); 5011 if (rv == WAIT_TIMEOUT) { 5012 Millis -= prd; 5013 } 5014 } 5015 v = _Event; 5016 _Event = 0; 5017 // see comment at end of os::PlatformEvent::park() below: 5018 OrderAccess::fence(); 5019 // If we encounter a nearly simultanous timeout expiry and unpark() 5020 // we return OS_OK indicating we awoke via unpark(). 5021 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 5022 return (v >= 0) ? OS_OK : OS_TIMEOUT; 5023 } 5024 5025 void os::PlatformEvent::park() { 5026 // Transitions for _Event: 5027 // -1 => -1 : illegal 5028 // 1 => 0 : pass - return immediately 5029 // 0 => -1 : block; then set _Event to 0 before returning 5030 5031 guarantee(_ParkHandle != NULL, "Invariant"); 5032 // Invariant: Only the thread associated with the Event/PlatformEvent 5033 // may call park(). 5034 // Consider: use atomic decrement instead of CAS-loop 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; 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 while (_Event < 0) { 5047 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE); 5048 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed"); 5049 } 5050 5051 // Usually we'll find _Event == 0 at this point, but as 5052 // an optional optimization we clear it, just in case can 5053 // multiple unpark() operations drove _Event up to 1. 5054 _Event = 0; 5055 OrderAccess::fence(); 5056 guarantee(_Event >= 0, "invariant"); 5057 } 5058 5059 void os::PlatformEvent::unpark() { 5060 guarantee(_ParkHandle != NULL, "Invariant"); 5061 5062 // Transitions for _Event: 5063 // 0 => 1 : just return 5064 // 1 => 1 : just return 5065 // -1 => either 0 or 1; must signal target thread 5066 // That is, we can safely transition _Event from -1 to either 5067 // 0 or 1. 5068 // See also: "Semaphores in Plan 9" by Mullender & Cox 5069 // 5070 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5071 // that it will take two back-to-back park() calls for the owning 5072 // thread to block. This has the benefit of forcing a spurious return 5073 // from the first park() call after an unpark() call which will help 5074 // shake out uses of park() and unpark() without condition variables. 5075 5076 if (Atomic::xchg(1, &_Event) >= 0) return; 5077 5078 ::SetEvent(_ParkHandle); 5079 } 5080 5081 5082 // JSR166 5083 // ------------------------------------------------------- 5084 5085 // The Windows implementation of Park is very straightforward: Basic 5086 // operations on Win32 Events turn out to have the right semantics to 5087 // use them directly. We opportunistically resuse the event inherited 5088 // from Monitor. 5089 5090 void Parker::park(bool isAbsolute, jlong time) { 5091 guarantee(_ParkEvent != NULL, "invariant"); 5092 // First, demultiplex/decode time arguments 5093 if (time < 0) { // don't wait 5094 return; 5095 } else if (time == 0 && !isAbsolute) { 5096 time = INFINITE; 5097 } else if (isAbsolute) { 5098 time -= os::javaTimeMillis(); // convert to relative time 5099 if (time <= 0) { // already elapsed 5100 return; 5101 } 5102 } else { // relative 5103 time /= 1000000; // Must coarsen from nanos to millis 5104 if (time == 0) { // Wait for the minimal time unit if zero 5105 time = 1; 5106 } 5107 } 5108 5109 JavaThread* thread = (JavaThread*)(Thread::current()); 5110 assert(thread->is_Java_thread(), "Must be JavaThread"); 5111 JavaThread *jt = (JavaThread *)thread; 5112 5113 // Don't wait if interrupted or already triggered 5114 if (Thread::is_interrupted(thread, false) || 5115 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 5116 ResetEvent(_ParkEvent); 5117 return; 5118 } else { 5119 ThreadBlockInVM tbivm(jt); 5120 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5121 jt->set_suspend_equivalent(); 5122 5123 WaitForSingleObject(_ParkEvent, time); 5124 ResetEvent(_ParkEvent); 5125 5126 // If externally suspended while waiting, re-suspend 5127 if (jt->handle_special_suspend_equivalent_condition()) { 5128 jt->java_suspend_self(); 5129 } 5130 } 5131 } 5132 5133 void Parker::unpark() { 5134 guarantee(_ParkEvent != NULL, "invariant"); 5135 SetEvent(_ParkEvent); 5136 } 5137 5138 // Run the specified command in a separate process. Return its exit value, 5139 // or -1 on failure (e.g. can't create a new process). 5140 int os::fork_and_exec(char* cmd) { 5141 STARTUPINFO si; 5142 PROCESS_INFORMATION pi; 5143 5144 memset(&si, 0, sizeof(si)); 5145 si.cb = sizeof(si); 5146 memset(&pi, 0, sizeof(pi)); 5147 BOOL rslt = CreateProcess(NULL, // executable name - use command line 5148 cmd, // command line 5149 NULL, // process security attribute 5150 NULL, // thread security attribute 5151 TRUE, // inherits system handles 5152 0, // no creation flags 5153 NULL, // use parent's environment block 5154 NULL, // use parent's starting directory 5155 &si, // (in) startup information 5156 &pi); // (out) process information 5157 5158 if (rslt) { 5159 // Wait until child process exits. 5160 WaitForSingleObject(pi.hProcess, INFINITE); 5161 5162 DWORD exit_code; 5163 GetExitCodeProcess(pi.hProcess, &exit_code); 5164 5165 // Close process and thread handles. 5166 CloseHandle(pi.hProcess); 5167 CloseHandle(pi.hThread); 5168 5169 return (int)exit_code; 5170 } else { 5171 return -1; 5172 } 5173 } 5174 5175 //-------------------------------------------------------------------------------------------------- 5176 // Non-product code 5177 5178 static int mallocDebugIntervalCounter = 0; 5179 static int mallocDebugCounter = 0; 5180 bool os::check_heap(bool force) { 5181 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 5182 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 5183 // Note: HeapValidate executes two hardware breakpoints when it finds something 5184 // wrong; at these points, eax contains the address of the offending block (I think). 5185 // To get to the exlicit error message(s) below, just continue twice. 5186 HANDLE heap = GetProcessHeap(); 5187 5188 // If we fail to lock the heap, then gflags.exe has been used 5189 // or some other special heap flag has been set that prevents 5190 // locking. We don't try to walk a heap we can't lock. 5191 if (HeapLock(heap) != 0) { 5192 PROCESS_HEAP_ENTRY phe; 5193 phe.lpData = NULL; 5194 while (HeapWalk(heap, &phe) != 0) { 5195 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 5196 !HeapValidate(heap, 0, phe.lpData)) { 5197 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 5198 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 5199 fatal("corrupted C heap"); 5200 } 5201 } 5202 DWORD err = GetLastError(); 5203 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 5204 fatal(err_msg("heap walk aborted with error %d", err)); 5205 } 5206 HeapUnlock(heap); 5207 } 5208 mallocDebugIntervalCounter = 0; 5209 } 5210 return true; 5211 } 5212 5213 5214 bool os::find(address addr, outputStream* st) { 5215 // Nothing yet 5216 return false; 5217 } 5218 5219 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 5220 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 5221 5222 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 5223 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow(); 5224 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 5225 address addr = (address) exceptionRecord->ExceptionInformation[1]; 5226 5227 if (os::is_memory_serialize_page(thread, addr)) { 5228 return EXCEPTION_CONTINUE_EXECUTION; 5229 } 5230 } 5231 5232 return EXCEPTION_CONTINUE_SEARCH; 5233 } 5234 5235 // We don't build a headless jre for Windows 5236 bool os::is_headless_jre() { return false; } 5237 5238 static jint initSock() { 5239 WSADATA wsadata; 5240 5241 if (!os::WinSock2Dll::WinSock2Available()) { 5242 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n", 5243 ::GetLastError()); 5244 return JNI_ERR; 5245 } 5246 5247 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) { 5248 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n", 5249 ::GetLastError()); 5250 return JNI_ERR; 5251 } 5252 return JNI_OK; 5253 } 5254 5255 struct hostent* os::get_host_by_name(char* name) { 5256 return (struct hostent*)os::WinSock2Dll::gethostbyname(name); 5257 } 5258 5259 int os::socket_close(int fd) { 5260 return ::closesocket(fd); 5261 } 5262 5263 int os::socket(int domain, int type, int protocol) { 5264 return ::socket(domain, type, protocol); 5265 } 5266 5267 int os::connect(int fd, struct sockaddr* him, socklen_t len) { 5268 return ::connect(fd, him, len); 5269 } 5270 5271 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5272 return ::recv(fd, buf, (int)nBytes, flags); 5273 } 5274 5275 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5276 return ::send(fd, buf, (int)nBytes, flags); 5277 } 5278 5279 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5280 return ::send(fd, buf, (int)nBytes, flags); 5281 } 5282 5283 // WINDOWS CONTEXT Flags for THREAD_SAMPLING 5284 #if defined(IA32) 5285 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS) 5286 #elif defined (AMD64) 5287 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT) 5288 #endif 5289 5290 // returns true if thread could be suspended, 5291 // false otherwise 5292 static bool do_suspend(HANDLE* h) { 5293 if (h != NULL) { 5294 if (SuspendThread(*h) != ~0) { 5295 return true; 5296 } 5297 } 5298 return false; 5299 } 5300 5301 // resume the thread 5302 // calling resume on an active thread is a no-op 5303 static void do_resume(HANDLE* h) { 5304 if (h != NULL) { 5305 ResumeThread(*h); 5306 } 5307 } 5308 5309 // retrieve a suspend/resume context capable handle 5310 // from the tid. Caller validates handle return value. 5311 void get_thread_handle_for_extended_context(HANDLE* h, 5312 OSThread::thread_id_t tid) { 5313 if (h != NULL) { 5314 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid); 5315 } 5316 } 5317 5318 // Thread sampling implementation 5319 // 5320 void os::SuspendedThreadTask::internal_do_task() { 5321 CONTEXT ctxt; 5322 HANDLE h = NULL; 5323 5324 // get context capable handle for thread 5325 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id()); 5326 5327 // sanity 5328 if (h == NULL || h == INVALID_HANDLE_VALUE) { 5329 return; 5330 } 5331 5332 // suspend the thread 5333 if (do_suspend(&h)) { 5334 ctxt.ContextFlags = sampling_context_flags; 5335 // get thread context 5336 GetThreadContext(h, &ctxt); 5337 SuspendedThreadTaskContext context(_thread, &ctxt); 5338 // pass context to Thread Sampling impl 5339 do_task(context); 5340 // resume thread 5341 do_resume(&h); 5342 } 5343 5344 // close handle 5345 CloseHandle(h); 5346 } 5347 5348 5349 // Kernel32 API 5350 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void); 5351 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD); 5352 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG); 5353 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG); 5354 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG); 5355 5356 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL; 5357 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL; 5358 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL; 5359 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL; 5360 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL; 5361 5362 5363 BOOL os::Kernel32Dll::initialized = FALSE; 5364 SIZE_T os::Kernel32Dll::GetLargePageMinimum() { 5365 assert(initialized && _GetLargePageMinimum != NULL, 5366 "GetLargePageMinimumAvailable() not yet called"); 5367 return _GetLargePageMinimum(); 5368 } 5369 5370 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() { 5371 if (!initialized) { 5372 initialize(); 5373 } 5374 return _GetLargePageMinimum != NULL; 5375 } 5376 5377 BOOL os::Kernel32Dll::NumaCallsAvailable() { 5378 if (!initialized) { 5379 initialize(); 5380 } 5381 return _VirtualAllocExNuma != NULL; 5382 } 5383 5384 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, 5385 SIZE_T bytes, DWORD flags, 5386 DWORD prot, DWORD node) { 5387 assert(initialized && _VirtualAllocExNuma != NULL, 5388 "NUMACallsAvailable() not yet called"); 5389 5390 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node); 5391 } 5392 5393 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) { 5394 assert(initialized && _GetNumaHighestNodeNumber != NULL, 5395 "NUMACallsAvailable() not yet called"); 5396 5397 return _GetNumaHighestNodeNumber(ptr_highest_node_number); 5398 } 5399 5400 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, 5401 PULONGLONG proc_mask) { 5402 assert(initialized && _GetNumaNodeProcessorMask != NULL, 5403 "NUMACallsAvailable() not yet called"); 5404 5405 return _GetNumaNodeProcessorMask(node, proc_mask); 5406 } 5407 5408 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip, 5409 ULONG FrameToCapture, 5410 PVOID* BackTrace, 5411 PULONG BackTraceHash) { 5412 if (!initialized) { 5413 initialize(); 5414 } 5415 5416 if (_RtlCaptureStackBackTrace != NULL) { 5417 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture, 5418 BackTrace, BackTraceHash); 5419 } else { 5420 return 0; 5421 } 5422 } 5423 5424 void os::Kernel32Dll::initializeCommon() { 5425 if (!initialized) { 5426 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5427 assert(handle != NULL, "Just check"); 5428 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum"); 5429 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma"); 5430 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber"); 5431 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask"); 5432 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace"); 5433 initialized = TRUE; 5434 } 5435 } 5436 5437 5438 5439 #ifndef JDK6_OR_EARLIER 5440 5441 void os::Kernel32Dll::initialize() { 5442 initializeCommon(); 5443 } 5444 5445 5446 // Kernel32 API 5447 inline BOOL os::Kernel32Dll::SwitchToThread() { 5448 return ::SwitchToThread(); 5449 } 5450 5451 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5452 return true; 5453 } 5454 5455 // Help tools 5456 inline BOOL os::Kernel32Dll::HelpToolsAvailable() { 5457 return true; 5458 } 5459 5460 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5461 DWORD th32ProcessId) { 5462 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5463 } 5464 5465 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot, 5466 LPMODULEENTRY32 lpme) { 5467 return ::Module32First(hSnapshot, lpme); 5468 } 5469 5470 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5471 LPMODULEENTRY32 lpme) { 5472 return ::Module32Next(hSnapshot, lpme); 5473 } 5474 5475 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5476 ::GetNativeSystemInfo(lpSystemInfo); 5477 } 5478 5479 // PSAPI API 5480 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, 5481 HMODULE *lpModule, DWORD cb, 5482 LPDWORD lpcbNeeded) { 5483 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5484 } 5485 5486 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, 5487 HMODULE hModule, 5488 LPTSTR lpFilename, 5489 DWORD nSize) { 5490 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5491 } 5492 5493 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, 5494 HMODULE hModule, 5495 LPMODULEINFO lpmodinfo, 5496 DWORD cb) { 5497 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5498 } 5499 5500 inline BOOL os::PSApiDll::PSApiAvailable() { 5501 return true; 5502 } 5503 5504 5505 // WinSock2 API 5506 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, 5507 LPWSADATA lpWSAData) { 5508 return ::WSAStartup(wVersionRequested, lpWSAData); 5509 } 5510 5511 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5512 return ::gethostbyname(name); 5513 } 5514 5515 inline BOOL os::WinSock2Dll::WinSock2Available() { 5516 return true; 5517 } 5518 5519 // Advapi API 5520 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5521 BOOL DisableAllPrivileges, 5522 PTOKEN_PRIVILEGES NewState, 5523 DWORD BufferLength, 5524 PTOKEN_PRIVILEGES PreviousState, 5525 PDWORD ReturnLength) { 5526 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5527 BufferLength, PreviousState, ReturnLength); 5528 } 5529 5530 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5531 DWORD DesiredAccess, 5532 PHANDLE TokenHandle) { 5533 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5534 } 5535 5536 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5537 LPCTSTR lpName, 5538 PLUID lpLuid) { 5539 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5540 } 5541 5542 inline BOOL os::Advapi32Dll::AdvapiAvailable() { 5543 return true; 5544 } 5545 5546 void* os::get_default_process_handle() { 5547 return (void*)GetModuleHandle(NULL); 5548 } 5549 5550 // Builds a platform dependent Agent_OnLoad_<lib_name> function name 5551 // which is used to find statically linked in agents. 5552 // Additionally for windows, takes into account __stdcall names. 5553 // Parameters: 5554 // sym_name: Symbol in library we are looking for 5555 // lib_name: Name of library to look in, NULL for shared libs. 5556 // is_absolute_path == true if lib_name is absolute path to agent 5557 // such as "C:/a/b/L.dll" 5558 // == false if only the base name of the library is passed in 5559 // such as "L" 5560 char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 5561 bool is_absolute_path) { 5562 char *agent_entry_name; 5563 size_t len; 5564 size_t name_len; 5565 size_t prefix_len = strlen(JNI_LIB_PREFIX); 5566 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 5567 const char *start; 5568 5569 if (lib_name != NULL) { 5570 len = name_len = strlen(lib_name); 5571 if (is_absolute_path) { 5572 // Need to strip path, prefix and suffix 5573 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 5574 lib_name = ++start; 5575 } else { 5576 // Need to check for drive prefix 5577 if ((start = strchr(lib_name, ':')) != NULL) { 5578 lib_name = ++start; 5579 } 5580 } 5581 if (len <= (prefix_len + suffix_len)) { 5582 return NULL; 5583 } 5584 lib_name += prefix_len; 5585 name_len = strlen(lib_name) - suffix_len; 5586 } 5587 } 5588 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 5589 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 5590 if (agent_entry_name == NULL) { 5591 return NULL; 5592 } 5593 if (lib_name != NULL) { 5594 const char *p = strrchr(sym_name, '@'); 5595 if (p != NULL && p != sym_name) { 5596 // sym_name == _Agent_OnLoad@XX 5597 strncpy(agent_entry_name, sym_name, (p - sym_name)); 5598 agent_entry_name[(p-sym_name)] = '\0'; 5599 // agent_entry_name == _Agent_OnLoad 5600 strcat(agent_entry_name, "_"); 5601 strncat(agent_entry_name, lib_name, name_len); 5602 strcat(agent_entry_name, p); 5603 // agent_entry_name == _Agent_OnLoad_lib_name@XX 5604 } else { 5605 strcpy(agent_entry_name, sym_name); 5606 strcat(agent_entry_name, "_"); 5607 strncat(agent_entry_name, lib_name, name_len); 5608 } 5609 } else { 5610 strcpy(agent_entry_name, sym_name); 5611 } 5612 return agent_entry_name; 5613 } 5614 5615 #else 5616 // Kernel32 API 5617 typedef BOOL (WINAPI* SwitchToThread_Fn)(void); 5618 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD); 5619 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32); 5620 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32); 5621 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO); 5622 5623 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL; 5624 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL; 5625 Module32First_Fn os::Kernel32Dll::_Module32First = NULL; 5626 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL; 5627 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL; 5628 5629 void os::Kernel32Dll::initialize() { 5630 if (!initialized) { 5631 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5632 assert(handle != NULL, "Just check"); 5633 5634 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread"); 5635 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn) 5636 ::GetProcAddress(handle, "CreateToolhelp32Snapshot"); 5637 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First"); 5638 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next"); 5639 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo"); 5640 initializeCommon(); // resolve the functions that always need resolving 5641 5642 initialized = TRUE; 5643 } 5644 } 5645 5646 BOOL os::Kernel32Dll::SwitchToThread() { 5647 assert(initialized && _SwitchToThread != NULL, 5648 "SwitchToThreadAvailable() not yet called"); 5649 return _SwitchToThread(); 5650 } 5651 5652 5653 BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5654 if (!initialized) { 5655 initialize(); 5656 } 5657 return _SwitchToThread != NULL; 5658 } 5659 5660 // Help tools 5661 BOOL os::Kernel32Dll::HelpToolsAvailable() { 5662 if (!initialized) { 5663 initialize(); 5664 } 5665 return _CreateToolhelp32Snapshot != NULL && 5666 _Module32First != NULL && 5667 _Module32Next != NULL; 5668 } 5669 5670 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5671 DWORD th32ProcessId) { 5672 assert(initialized && _CreateToolhelp32Snapshot != NULL, 5673 "HelpToolsAvailable() not yet called"); 5674 5675 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5676 } 5677 5678 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5679 assert(initialized && _Module32First != NULL, 5680 "HelpToolsAvailable() not yet called"); 5681 5682 return _Module32First(hSnapshot, lpme); 5683 } 5684 5685 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5686 LPMODULEENTRY32 lpme) { 5687 assert(initialized && _Module32Next != NULL, 5688 "HelpToolsAvailable() not yet called"); 5689 5690 return _Module32Next(hSnapshot, lpme); 5691 } 5692 5693 5694 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() { 5695 if (!initialized) { 5696 initialize(); 5697 } 5698 return _GetNativeSystemInfo != NULL; 5699 } 5700 5701 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5702 assert(initialized && _GetNativeSystemInfo != NULL, 5703 "GetNativeSystemInfoAvailable() not yet called"); 5704 5705 _GetNativeSystemInfo(lpSystemInfo); 5706 } 5707 5708 // PSAPI API 5709 5710 5711 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD); 5712 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD); 5713 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD); 5714 5715 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL; 5716 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL; 5717 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL; 5718 BOOL os::PSApiDll::initialized = FALSE; 5719 5720 void os::PSApiDll::initialize() { 5721 if (!initialized) { 5722 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0); 5723 if (handle != NULL) { 5724 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle, 5725 "EnumProcessModules"); 5726 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle, 5727 "GetModuleFileNameExA"); 5728 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle, 5729 "GetModuleInformation"); 5730 } 5731 initialized = TRUE; 5732 } 5733 } 5734 5735 5736 5737 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, 5738 DWORD cb, LPDWORD lpcbNeeded) { 5739 assert(initialized && _EnumProcessModules != NULL, 5740 "PSApiAvailable() not yet called"); 5741 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5742 } 5743 5744 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, 5745 LPTSTR lpFilename, DWORD nSize) { 5746 assert(initialized && _GetModuleFileNameEx != NULL, 5747 "PSApiAvailable() not yet called"); 5748 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5749 } 5750 5751 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, 5752 LPMODULEINFO lpmodinfo, DWORD cb) { 5753 assert(initialized && _GetModuleInformation != NULL, 5754 "PSApiAvailable() not yet called"); 5755 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5756 } 5757 5758 BOOL os::PSApiDll::PSApiAvailable() { 5759 if (!initialized) { 5760 initialize(); 5761 } 5762 return _EnumProcessModules != NULL && 5763 _GetModuleFileNameEx != NULL && 5764 _GetModuleInformation != NULL; 5765 } 5766 5767 5768 // WinSock2 API 5769 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA); 5770 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...); 5771 5772 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL; 5773 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL; 5774 BOOL os::WinSock2Dll::initialized = FALSE; 5775 5776 void os::WinSock2Dll::initialize() { 5777 if (!initialized) { 5778 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0); 5779 if (handle != NULL) { 5780 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup"); 5781 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname"); 5782 } 5783 initialized = TRUE; 5784 } 5785 } 5786 5787 5788 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) { 5789 assert(initialized && _WSAStartup != NULL, 5790 "WinSock2Available() not yet called"); 5791 return _WSAStartup(wVersionRequested, lpWSAData); 5792 } 5793 5794 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5795 assert(initialized && _gethostbyname != NULL, 5796 "WinSock2Available() not yet called"); 5797 return _gethostbyname(name); 5798 } 5799 5800 BOOL os::WinSock2Dll::WinSock2Available() { 5801 if (!initialized) { 5802 initialize(); 5803 } 5804 return _WSAStartup != NULL && 5805 _gethostbyname != NULL; 5806 } 5807 5808 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 5809 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE); 5810 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID); 5811 5812 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL; 5813 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL; 5814 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL; 5815 BOOL os::Advapi32Dll::initialized = FALSE; 5816 5817 void os::Advapi32Dll::initialize() { 5818 if (!initialized) { 5819 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0); 5820 if (handle != NULL) { 5821 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle, 5822 "AdjustTokenPrivileges"); 5823 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle, 5824 "OpenProcessToken"); 5825 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle, 5826 "LookupPrivilegeValueA"); 5827 } 5828 initialized = TRUE; 5829 } 5830 } 5831 5832 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5833 BOOL DisableAllPrivileges, 5834 PTOKEN_PRIVILEGES NewState, 5835 DWORD BufferLength, 5836 PTOKEN_PRIVILEGES PreviousState, 5837 PDWORD ReturnLength) { 5838 assert(initialized && _AdjustTokenPrivileges != NULL, 5839 "AdvapiAvailable() not yet called"); 5840 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5841 BufferLength, PreviousState, ReturnLength); 5842 } 5843 5844 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5845 DWORD DesiredAccess, 5846 PHANDLE TokenHandle) { 5847 assert(initialized && _OpenProcessToken != NULL, 5848 "AdvapiAvailable() not yet called"); 5849 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5850 } 5851 5852 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5853 LPCTSTR lpName, PLUID lpLuid) { 5854 assert(initialized && _LookupPrivilegeValue != NULL, 5855 "AdvapiAvailable() not yet called"); 5856 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5857 } 5858 5859 BOOL os::Advapi32Dll::AdvapiAvailable() { 5860 if (!initialized) { 5861 initialize(); 5862 } 5863 return _AdjustTokenPrivileges != NULL && 5864 _OpenProcessToken != NULL && 5865 _LookupPrivilegeValue != NULL; 5866 } 5867 5868 #endif 5869 5870 #ifndef PRODUCT 5871 5872 // test the code path in reserve_memory_special() that tries to allocate memory in a single 5873 // contiguous memory block at a particular address. 5874 // The test first tries to find a good approximate address to allocate at by using the same 5875 // method to allocate some memory at any address. The test then tries to allocate memory in 5876 // the vicinity (not directly after it to avoid possible by-chance use of that location) 5877 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of 5878 // the previously allocated memory is available for allocation. The only actual failure 5879 // that is reported is when the test tries to allocate at a particular location but gets a 5880 // different valid one. A NULL return value at this point is not considered an error but may 5881 // be legitimate. 5882 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages. 5883 void TestReserveMemorySpecial_test() { 5884 if (!UseLargePages) { 5885 if (VerboseInternalVMTests) { 5886 gclog_or_tty->print("Skipping test because large pages are disabled"); 5887 } 5888 return; 5889 } 5890 // save current value of globals 5891 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; 5892 bool old_use_numa_interleaving = UseNUMAInterleaving; 5893 5894 // set globals to make sure we hit the correct code path 5895 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; 5896 5897 // do an allocation at an address selected by the OS to get a good one. 5898 const size_t large_allocation_size = os::large_page_size() * 4; 5899 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); 5900 if (result == NULL) { 5901 if (VerboseInternalVMTests) { 5902 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.", 5903 large_allocation_size); 5904 } 5905 } else { 5906 os::release_memory_special(result, large_allocation_size); 5907 5908 // allocate another page within the recently allocated memory area which seems to be a good location. At least 5909 // we managed to get it once. 5910 const size_t expected_allocation_size = os::large_page_size(); 5911 char* expected_location = result + os::large_page_size(); 5912 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); 5913 if (actual_location == NULL) { 5914 if (VerboseInternalVMTests) { 5915 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.", 5916 expected_location, large_allocation_size); 5917 } 5918 } else { 5919 // release memory 5920 os::release_memory_special(actual_location, expected_allocation_size); 5921 // only now check, after releasing any memory to avoid any leaks. 5922 assert(actual_location == expected_location, 5923 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead", 5924 expected_location, expected_allocation_size, actual_location)); 5925 } 5926 } 5927 5928 // restore globals 5929 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; 5930 UseNUMAInterleaving = old_use_numa_interleaving; 5931 } 5932 #endif // PRODUCT 5933