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 #else 118 #ifdef _M_AMD64 119 #define __CPU__ amd64 120 #else 121 #define __CPU__ i486 122 #endif 123 #endif 124 125 // save DLL module handle, used by GetModuleFileName 126 127 HINSTANCE vm_lib_handle; 128 129 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { 130 switch (reason) { 131 case DLL_PROCESS_ATTACH: 132 vm_lib_handle = hinst; 133 if (ForceTimeHighResolution) { 134 timeBeginPeriod(1L); 135 } 136 break; 137 case DLL_PROCESS_DETACH: 138 if (ForceTimeHighResolution) { 139 timeEndPeriod(1L); 140 } 141 break; 142 default: 143 break; 144 } 145 return true; 146 } 147 148 static inline double fileTimeAsDouble(FILETIME* time) { 149 const double high = (double) ((unsigned int) ~0); 150 const double split = 10000000.0; 151 double result = (time->dwLowDateTime / split) + 152 time->dwHighDateTime * (high/split); 153 return result; 154 } 155 156 // Implementation of os 157 158 bool os::unsetenv(const char* name) { 159 assert(name != NULL, "Null pointer"); 160 return (SetEnvironmentVariable(name, NULL) == TRUE); 161 } 162 163 // No setuid programs under Windows. 164 bool os::have_special_privileges() { 165 return false; 166 } 167 168 169 // This method is a periodic task to check for misbehaving JNI applications 170 // under CheckJNI, we can add any periodic checks here. 171 // For Windows at the moment does nothing 172 void os::run_periodic_checks() { 173 return; 174 } 175 176 // previous UnhandledExceptionFilter, if there is one 177 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL; 178 179 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 180 181 void os::init_system_properties_values() { 182 // sysclasspath, java_home, dll_dir 183 { 184 char *home_path; 185 char *dll_path; 186 char *pslash; 187 char *bin = "\\bin"; 188 char home_dir[MAX_PATH + 1]; 189 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR"); 190 191 if (alt_home_dir != NULL) { 192 strncpy(home_dir, alt_home_dir, MAX_PATH + 1); 193 home_dir[MAX_PATH] = '\0'; 194 } else { 195 os::jvm_path(home_dir, sizeof(home_dir)); 196 // Found the full path to jvm.dll. 197 // Now cut the path to <java_home>/jre if we can. 198 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll 199 pslash = strrchr(home_dir, '\\'); 200 if (pslash != NULL) { 201 *pslash = '\0'; // get rid of \{client|server} 202 pslash = strrchr(home_dir, '\\'); 203 if (pslash != NULL) { 204 *pslash = '\0'; // get rid of \bin 205 } 206 } 207 } 208 209 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal); 210 if (home_path == NULL) { 211 return; 212 } 213 strcpy(home_path, home_dir); 214 Arguments::set_java_home(home_path); 215 FREE_C_HEAP_ARRAY(char, home_path); 216 217 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, 218 mtInternal); 219 if (dll_path == NULL) { 220 return; 221 } 222 strcpy(dll_path, home_dir); 223 strcat(dll_path, bin); 224 Arguments::set_dll_dir(dll_path); 225 FREE_C_HEAP_ARRAY(char, dll_path); 226 227 if (!set_boot_path('\\', ';')) { 228 return; 229 } 230 } 231 232 // library_path 233 #define EXT_DIR "\\lib\\ext" 234 #define BIN_DIR "\\bin" 235 #define PACKAGE_DIR "\\Sun\\Java" 236 { 237 // Win32 library search order (See the documentation for LoadLibrary): 238 // 239 // 1. The directory from which application is loaded. 240 // 2. The system wide Java Extensions directory (Java only) 241 // 3. System directory (GetSystemDirectory) 242 // 4. Windows directory (GetWindowsDirectory) 243 // 5. The PATH environment variable 244 // 6. The current directory 245 246 char *library_path; 247 char tmp[MAX_PATH]; 248 char *path_str = ::getenv("PATH"); 249 250 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 251 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal); 252 253 library_path[0] = '\0'; 254 255 GetModuleFileName(NULL, tmp, sizeof(tmp)); 256 *(strrchr(tmp, '\\')) = '\0'; 257 strcat(library_path, tmp); 258 259 GetWindowsDirectory(tmp, sizeof(tmp)); 260 strcat(library_path, ";"); 261 strcat(library_path, tmp); 262 strcat(library_path, PACKAGE_DIR BIN_DIR); 263 264 GetSystemDirectory(tmp, sizeof(tmp)); 265 strcat(library_path, ";"); 266 strcat(library_path, tmp); 267 268 GetWindowsDirectory(tmp, sizeof(tmp)); 269 strcat(library_path, ";"); 270 strcat(library_path, tmp); 271 272 if (path_str) { 273 strcat(library_path, ";"); 274 strcat(library_path, path_str); 275 } 276 277 strcat(library_path, ";."); 278 279 Arguments::set_library_path(library_path); 280 FREE_C_HEAP_ARRAY(char, library_path); 281 } 282 283 // Default extensions directory 284 { 285 char path[MAX_PATH]; 286 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 287 GetWindowsDirectory(path, MAX_PATH); 288 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 289 path, PACKAGE_DIR, EXT_DIR); 290 Arguments::set_ext_dirs(buf); 291 } 292 #undef EXT_DIR 293 #undef BIN_DIR 294 #undef PACKAGE_DIR 295 296 #ifndef _WIN64 297 // set our UnhandledExceptionFilter and save any previous one 298 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception); 299 #endif 300 301 // Done 302 return; 303 } 304 305 void os::breakpoint() { 306 DebugBreak(); 307 } 308 309 // Invoked from the BREAKPOINT Macro 310 extern "C" void breakpoint() { 311 os::breakpoint(); 312 } 313 314 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP. 315 // So far, this method is only used by Native Memory Tracking, which is 316 // only supported on Windows XP or later. 317 // 318 int os::get_native_stack(address* stack, int frames, int toSkip) { 319 #ifdef _NMT_NOINLINE_ 320 toSkip++; 321 #endif 322 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames, 323 (PVOID*)stack, NULL); 324 for (int index = captured; index < frames; index ++) { 325 stack[index] = NULL; 326 } 327 return captured; 328 } 329 330 331 // os::current_stack_base() 332 // 333 // Returns the base of the stack, which is the stack's 334 // starting address. This function must be called 335 // while running on the stack of the thread being queried. 336 337 address os::current_stack_base() { 338 MEMORY_BASIC_INFORMATION minfo; 339 address stack_bottom; 340 size_t stack_size; 341 342 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 343 stack_bottom = (address)minfo.AllocationBase; 344 stack_size = minfo.RegionSize; 345 346 // Add up the sizes of all the regions with the same 347 // AllocationBase. 348 while (1) { 349 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 350 if (stack_bottom == (address)minfo.AllocationBase) { 351 stack_size += minfo.RegionSize; 352 } else { 353 break; 354 } 355 } 356 357 #ifdef _M_IA64 358 // IA64 has memory and register stacks 359 // 360 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit 361 // at thread creation (1MB backing store growing upwards, 1MB memory stack 362 // growing downwards, 2MB summed up) 363 // 364 // ... 365 // ------- top of stack (high address) ----- 366 // | 367 // | 1MB 368 // | Backing Store (Register Stack) 369 // | 370 // | / \ 371 // | | 372 // | | 373 // | | 374 // ------------------------ stack base ----- 375 // | 1MB 376 // | Memory Stack 377 // | 378 // | | 379 // | | 380 // | | 381 // | \ / 382 // | 383 // ----- bottom of stack (low address) ----- 384 // ... 385 386 stack_size = stack_size / 2; 387 #endif 388 return stack_bottom + stack_size; 389 } 390 391 size_t os::current_stack_size() { 392 size_t sz; 393 MEMORY_BASIC_INFORMATION minfo; 394 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 395 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 396 return sz; 397 } 398 399 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 400 const struct tm* time_struct_ptr = localtime(clock); 401 if (time_struct_ptr != NULL) { 402 *res = *time_struct_ptr; 403 return res; 404 } 405 return NULL; 406 } 407 408 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 409 410 // Thread start routine for all new Java threads 411 static unsigned __stdcall java_start(Thread* thread) { 412 // Try to randomize the cache line index of hot stack frames. 413 // This helps when threads of the same stack traces evict each other's 414 // cache lines. The threads can be either from the same JVM instance, or 415 // from different JVM instances. The benefit is especially true for 416 // processors with hyperthreading technology. 417 static int counter = 0; 418 int pid = os::current_process_id(); 419 _alloca(((pid ^ counter++) & 7) * 128); 420 421 OSThread* osthr = thread->osthread(); 422 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 423 424 if (UseNUMA) { 425 int lgrp_id = os::numa_get_group_id(); 426 if (lgrp_id != -1) { 427 thread->set_lgrp_id(lgrp_id); 428 } 429 } 430 431 // Diagnostic code to investigate JDK-6573254 432 int res = 30115; // non-java thread 433 if (thread->is_Java_thread()) { 434 res = 20115; // java thread 435 } 436 437 // Install a win32 structured exception handler around every thread created 438 // by VM, so VM can generate error dump when an exception occurred in non- 439 // Java thread (e.g. VM thread). 440 __try { 441 thread->run(); 442 } __except(topLevelExceptionFilter( 443 (_EXCEPTION_POINTERS*)_exception_info())) { 444 // Nothing to do. 445 } 446 447 // One less thread is executing 448 // When the VMThread gets here, the main thread may have already exited 449 // which frees the CodeHeap containing the Atomic::add code 450 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 451 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); 452 } 453 454 // Thread must not return from exit_process_or_thread(), but if it does, 455 // let it proceed to exit normally 456 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res); 457 } 458 459 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, 460 int thread_id) { 461 // Allocate the OSThread object 462 OSThread* osthread = new OSThread(NULL, NULL); 463 if (osthread == NULL) return NULL; 464 465 // Initialize support for Java interrupts 466 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 467 if (interrupt_event == NULL) { 468 delete osthread; 469 return NULL; 470 } 471 osthread->set_interrupt_event(interrupt_event); 472 473 // Store info on the Win32 thread into the OSThread 474 osthread->set_thread_handle(thread_handle); 475 osthread->set_thread_id(thread_id); 476 477 if (UseNUMA) { 478 int lgrp_id = os::numa_get_group_id(); 479 if (lgrp_id != -1) { 480 thread->set_lgrp_id(lgrp_id); 481 } 482 } 483 484 // Initial thread state is INITIALIZED, not SUSPENDED 485 osthread->set_state(INITIALIZED); 486 487 return osthread; 488 } 489 490 491 bool os::create_attached_thread(JavaThread* thread) { 492 #ifdef ASSERT 493 thread->verify_not_published(); 494 #endif 495 HANDLE thread_h; 496 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 497 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 498 fatal("DuplicateHandle failed\n"); 499 } 500 OSThread* osthread = create_os_thread(thread, thread_h, 501 (int)current_thread_id()); 502 if (osthread == NULL) { 503 return false; 504 } 505 506 // Initial thread state is RUNNABLE 507 osthread->set_state(RUNNABLE); 508 509 thread->set_osthread(osthread); 510 return true; 511 } 512 513 bool os::create_main_thread(JavaThread* thread) { 514 #ifdef ASSERT 515 thread->verify_not_published(); 516 #endif 517 if (_starting_thread == NULL) { 518 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 519 if (_starting_thread == NULL) { 520 return false; 521 } 522 } 523 524 // The primordial thread is runnable from the start) 525 _starting_thread->set_state(RUNNABLE); 526 527 thread->set_osthread(_starting_thread); 528 return true; 529 } 530 531 // Allocate and initialize a new OSThread 532 bool os::create_thread(Thread* thread, ThreadType thr_type, 533 size_t stack_size) { 534 unsigned thread_id; 535 536 // Allocate the OSThread object 537 OSThread* osthread = new OSThread(NULL, NULL); 538 if (osthread == NULL) { 539 return false; 540 } 541 542 // Initialize support for Java interrupts 543 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 544 if (interrupt_event == NULL) { 545 delete osthread; 546 return NULL; 547 } 548 osthread->set_interrupt_event(interrupt_event); 549 osthread->set_interrupted(false); 550 551 thread->set_osthread(osthread); 552 553 if (stack_size == 0) { 554 switch (thr_type) { 555 case os::java_thread: 556 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 557 if (JavaThread::stack_size_at_create() > 0) { 558 stack_size = JavaThread::stack_size_at_create(); 559 } 560 break; 561 case os::compiler_thread: 562 if (CompilerThreadStackSize > 0) { 563 stack_size = (size_t)(CompilerThreadStackSize * K); 564 break; 565 } // else fall through: 566 // use VMThreadStackSize if CompilerThreadStackSize is not defined 567 case os::vm_thread: 568 case os::pgc_thread: 569 case os::cgc_thread: 570 case os::watcher_thread: 571 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 572 break; 573 } 574 } 575 576 // Create the Win32 thread 577 // 578 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 579 // does not specify stack size. Instead, it specifies the size of 580 // initially committed space. The stack size is determined by 581 // PE header in the executable. If the committed "stack_size" is larger 582 // than default value in the PE header, the stack is rounded up to the 583 // nearest multiple of 1MB. For example if the launcher has default 584 // stack size of 320k, specifying any size less than 320k does not 585 // affect the actual stack size at all, it only affects the initial 586 // commitment. On the other hand, specifying 'stack_size' larger than 587 // default value may cause significant increase in memory usage, because 588 // not only the stack space will be rounded up to MB, but also the 589 // entire space is committed upfront. 590 // 591 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 592 // for CreateThread() that can treat 'stack_size' as stack size. However we 593 // are not supposed to call CreateThread() directly according to MSDN 594 // document because JVM uses C runtime library. The good news is that the 595 // flag appears to work with _beginthredex() as well. 596 597 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION 598 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000) 599 #endif 600 601 HANDLE thread_handle = 602 (HANDLE)_beginthreadex(NULL, 603 (unsigned)stack_size, 604 (unsigned (__stdcall *)(void*)) java_start, 605 thread, 606 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, 607 &thread_id); 608 if (thread_handle == NULL) { 609 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again 610 // without the flag. 611 thread_handle = 612 (HANDLE)_beginthreadex(NULL, 613 (unsigned)stack_size, 614 (unsigned (__stdcall *)(void*)) java_start, 615 thread, 616 CREATE_SUSPENDED, 617 &thread_id); 618 } 619 if (thread_handle == NULL) { 620 // Need to clean up stuff we've allocated so far 621 CloseHandle(osthread->interrupt_event()); 622 thread->set_osthread(NULL); 623 delete osthread; 624 return NULL; 625 } 626 627 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); 628 629 // Store info on the Win32 thread into the OSThread 630 osthread->set_thread_handle(thread_handle); 631 osthread->set_thread_id(thread_id); 632 633 // Initial thread state is INITIALIZED, not SUSPENDED 634 osthread->set_state(INITIALIZED); 635 636 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 637 return true; 638 } 639 640 641 // Free Win32 resources related to the OSThread 642 void os::free_thread(OSThread* osthread) { 643 assert(osthread != NULL, "osthread not set"); 644 CloseHandle(osthread->thread_handle()); 645 CloseHandle(osthread->interrupt_event()); 646 delete osthread; 647 } 648 649 static jlong first_filetime; 650 static jlong initial_performance_count; 651 static jlong performance_frequency; 652 653 654 jlong as_long(LARGE_INTEGER x) { 655 jlong result = 0; // initialization to avoid warning 656 set_high(&result, x.HighPart); 657 set_low(&result, x.LowPart); 658 return result; 659 } 660 661 662 jlong os::elapsed_counter() { 663 LARGE_INTEGER count; 664 if (win32::_has_performance_count) { 665 QueryPerformanceCounter(&count); 666 return as_long(count) - initial_performance_count; 667 } else { 668 FILETIME wt; 669 GetSystemTimeAsFileTime(&wt); 670 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime); 671 } 672 } 673 674 675 jlong os::elapsed_frequency() { 676 if (win32::_has_performance_count) { 677 return performance_frequency; 678 } else { 679 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601. 680 return 10000000; 681 } 682 } 683 684 685 julong os::available_memory() { 686 return win32::available_memory(); 687 } 688 689 julong os::win32::available_memory() { 690 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 691 // value if total memory is larger than 4GB 692 MEMORYSTATUSEX ms; 693 ms.dwLength = sizeof(ms); 694 GlobalMemoryStatusEx(&ms); 695 696 return (julong)ms.ullAvailPhys; 697 } 698 699 julong os::physical_memory() { 700 return win32::physical_memory(); 701 } 702 703 bool os::has_allocatable_memory_limit(julong* limit) { 704 MEMORYSTATUSEX ms; 705 ms.dwLength = sizeof(ms); 706 GlobalMemoryStatusEx(&ms); 707 #ifdef _LP64 708 *limit = (julong)ms.ullAvailVirtual; 709 return true; 710 #else 711 // Limit to 1400m because of the 2gb address space wall 712 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual); 713 return true; 714 #endif 715 } 716 717 // VC6 lacks DWORD_PTR 718 #if _MSC_VER < 1300 719 typedef UINT_PTR DWORD_PTR; 720 #endif 721 722 int os::active_processor_count() { 723 DWORD_PTR lpProcessAffinityMask = 0; 724 DWORD_PTR lpSystemAffinityMask = 0; 725 int proc_count = processor_count(); 726 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 727 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 728 // Nof active processors is number of bits in process affinity mask 729 int bitcount = 0; 730 while (lpProcessAffinityMask != 0) { 731 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 732 bitcount++; 733 } 734 return bitcount; 735 } else { 736 return proc_count; 737 } 738 } 739 740 void os::set_native_thread_name(const char *name) { 741 742 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx 743 // 744 // Note that unfortunately this only works if the process 745 // is already attached to a debugger; debugger must observe 746 // the exception below to show the correct name. 747 748 const DWORD MS_VC_EXCEPTION = 0x406D1388; 749 struct { 750 DWORD dwType; // must be 0x1000 751 LPCSTR szName; // pointer to name (in user addr space) 752 DWORD dwThreadID; // thread ID (-1=caller thread) 753 DWORD dwFlags; // reserved for future use, must be zero 754 } info; 755 756 info.dwType = 0x1000; 757 info.szName = name; 758 info.dwThreadID = -1; 759 info.dwFlags = 0; 760 761 __try { 762 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info ); 763 } __except(EXCEPTION_CONTINUE_EXECUTION) {} 764 } 765 766 bool os::distribute_processes(uint length, uint* distribution) { 767 // Not yet implemented. 768 return false; 769 } 770 771 bool os::bind_to_processor(uint processor_id) { 772 // Not yet implemented. 773 return false; 774 } 775 776 void os::win32::initialize_performance_counter() { 777 LARGE_INTEGER count; 778 if (QueryPerformanceFrequency(&count)) { 779 win32::_has_performance_count = 1; 780 performance_frequency = as_long(count); 781 QueryPerformanceCounter(&count); 782 initial_performance_count = as_long(count); 783 } else { 784 win32::_has_performance_count = 0; 785 FILETIME wt; 786 GetSystemTimeAsFileTime(&wt); 787 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 788 } 789 } 790 791 792 double os::elapsedTime() { 793 return (double) elapsed_counter() / (double) elapsed_frequency(); 794 } 795 796 797 // Windows format: 798 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 799 // Java format: 800 // Java standards require the number of milliseconds since 1/1/1970 801 802 // Constant offset - calculated using offset() 803 static jlong _offset = 116444736000000000; 804 // Fake time counter for reproducible results when debugging 805 static jlong fake_time = 0; 806 807 #ifdef ASSERT 808 // Just to be safe, recalculate the offset in debug mode 809 static jlong _calculated_offset = 0; 810 static int _has_calculated_offset = 0; 811 812 jlong offset() { 813 if (_has_calculated_offset) return _calculated_offset; 814 SYSTEMTIME java_origin; 815 java_origin.wYear = 1970; 816 java_origin.wMonth = 1; 817 java_origin.wDayOfWeek = 0; // ignored 818 java_origin.wDay = 1; 819 java_origin.wHour = 0; 820 java_origin.wMinute = 0; 821 java_origin.wSecond = 0; 822 java_origin.wMilliseconds = 0; 823 FILETIME jot; 824 if (!SystemTimeToFileTime(&java_origin, &jot)) { 825 fatal(err_msg("Error = %d\nWindows error", GetLastError())); 826 } 827 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 828 _has_calculated_offset = 1; 829 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 830 return _calculated_offset; 831 } 832 #else 833 jlong offset() { 834 return _offset; 835 } 836 #endif 837 838 jlong windows_to_java_time(FILETIME wt) { 839 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 840 return (a - offset()) / 10000; 841 } 842 843 // Returns time ticks in (10th of micro seconds) 844 jlong windows_to_time_ticks(FILETIME wt) { 845 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 846 return (a - offset()); 847 } 848 849 FILETIME java_to_windows_time(jlong l) { 850 jlong a = (l * 10000) + offset(); 851 FILETIME result; 852 result.dwHighDateTime = high(a); 853 result.dwLowDateTime = low(a); 854 return result; 855 } 856 857 bool os::supports_vtime() { return true; } 858 bool os::enable_vtime() { return false; } 859 bool os::vtime_enabled() { return false; } 860 861 double os::elapsedVTime() { 862 FILETIME created; 863 FILETIME exited; 864 FILETIME kernel; 865 FILETIME user; 866 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) { 867 // the resolution of windows_to_java_time() should be sufficient (ms) 868 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS; 869 } else { 870 return elapsedTime(); 871 } 872 } 873 874 jlong os::javaTimeMillis() { 875 if (UseFakeTimers) { 876 return fake_time++; 877 } else { 878 FILETIME wt; 879 GetSystemTimeAsFileTime(&wt); 880 return windows_to_java_time(wt); 881 } 882 } 883 884 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 885 FILETIME wt; 886 GetSystemTimeAsFileTime(&wt); 887 jlong ticks = windows_to_time_ticks(wt); // 10th of micros 888 jlong secs = jlong(ticks / 10000000); // 10000 * 1000 889 seconds = secs; 890 nanos = jlong(ticks - (secs*10000000)) * 100; 891 } 892 893 jlong os::javaTimeNanos() { 894 if (!win32::_has_performance_count) { 895 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do. 896 } else { 897 LARGE_INTEGER current_count; 898 QueryPerformanceCounter(¤t_count); 899 double current = as_long(current_count); 900 double freq = performance_frequency; 901 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC); 902 return time; 903 } 904 } 905 906 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 907 if (!win32::_has_performance_count) { 908 // javaTimeMillis() doesn't have much percision, 909 // but it is not going to wrap -- so all 64 bits 910 info_ptr->max_value = ALL_64_BITS; 911 912 // this is a wall clock timer, so may skip 913 info_ptr->may_skip_backward = true; 914 info_ptr->may_skip_forward = true; 915 } else { 916 jlong freq = performance_frequency; 917 if (freq < NANOSECS_PER_SEC) { 918 // the performance counter is 64 bits and we will 919 // be multiplying it -- so no wrap in 64 bits 920 info_ptr->max_value = ALL_64_BITS; 921 } else if (freq > NANOSECS_PER_SEC) { 922 // use the max value the counter can reach to 923 // determine the max value which could be returned 924 julong max_counter = (julong)ALL_64_BITS; 925 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC)); 926 } else { 927 // the performance counter is 64 bits and we will 928 // be using it directly -- so no wrap in 64 bits 929 info_ptr->max_value = ALL_64_BITS; 930 } 931 932 // using a counter, so no skipping 933 info_ptr->may_skip_backward = false; 934 info_ptr->may_skip_forward = false; 935 } 936 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 937 } 938 939 char* os::local_time_string(char *buf, size_t buflen) { 940 SYSTEMTIME st; 941 GetLocalTime(&st); 942 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 943 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 944 return buf; 945 } 946 947 bool os::getTimesSecs(double* process_real_time, 948 double* process_user_time, 949 double* process_system_time) { 950 HANDLE h_process = GetCurrentProcess(); 951 FILETIME create_time, exit_time, kernel_time, user_time; 952 BOOL result = GetProcessTimes(h_process, 953 &create_time, 954 &exit_time, 955 &kernel_time, 956 &user_time); 957 if (result != 0) { 958 FILETIME wt; 959 GetSystemTimeAsFileTime(&wt); 960 jlong rtc_millis = windows_to_java_time(wt); 961 jlong user_millis = windows_to_java_time(user_time); 962 jlong system_millis = windows_to_java_time(kernel_time); 963 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 964 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); 965 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); 966 return true; 967 } else { 968 return false; 969 } 970 } 971 972 void os::shutdown() { 973 // allow PerfMemory to attempt cleanup of any persistent resources 974 perfMemory_exit(); 975 976 // flush buffered output, finish log files 977 ostream_abort(); 978 979 // Check for abort hook 980 abort_hook_t abort_hook = Arguments::abort_hook(); 981 if (abort_hook != NULL) { 982 abort_hook(); 983 } 984 } 985 986 987 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 988 PMINIDUMP_EXCEPTION_INFORMATION, 989 PMINIDUMP_USER_STREAM_INFORMATION, 990 PMINIDUMP_CALLBACK_INFORMATION); 991 992 static HANDLE dumpFile = NULL; 993 994 // Check if dump file can be created. 995 void os::check_dump_limit(char* buffer, size_t buffsz) { 996 bool status = true; 997 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) { 998 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line"); 999 status = false; 1000 } else { 1001 const char* cwd = get_current_directory(NULL, 0); 1002 int pid = current_process_id(); 1003 if (cwd != NULL) { 1004 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid); 1005 } else { 1006 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid); 1007 } 1008 1009 if (dumpFile == NULL && 1010 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL)) 1011 == INVALID_HANDLE_VALUE) { 1012 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError()); 1013 status = false; 1014 } 1015 } 1016 VMError::record_coredump_status(buffer, status); 1017 } 1018 1019 void os::abort(bool dump_core, void* siginfo, void* context) { 1020 HINSTANCE dbghelp; 1021 EXCEPTION_POINTERS ep; 1022 MINIDUMP_EXCEPTION_INFORMATION mei; 1023 MINIDUMP_EXCEPTION_INFORMATION* pmei; 1024 1025 HANDLE hProcess = GetCurrentProcess(); 1026 DWORD processId = GetCurrentProcessId(); 1027 MINIDUMP_TYPE dumpType; 1028 1029 shutdown(); 1030 if (!dump_core || dumpFile == NULL) { 1031 if (dumpFile != NULL) { 1032 CloseHandle(dumpFile); 1033 } 1034 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1035 } 1036 1037 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0); 1038 1039 if (dbghelp == NULL) { 1040 jio_fprintf(stderr, "Failed to load dbghelp.dll\n"); 1041 CloseHandle(dumpFile); 1042 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1043 } 1044 1045 _MiniDumpWriteDump = 1046 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 1047 PMINIDUMP_EXCEPTION_INFORMATION, 1048 PMINIDUMP_USER_STREAM_INFORMATION, 1049 PMINIDUMP_CALLBACK_INFORMATION), 1050 GetProcAddress(dbghelp, 1051 "MiniDumpWriteDump")); 1052 1053 if (_MiniDumpWriteDump == NULL) { 1054 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n"); 1055 CloseHandle(dumpFile); 1056 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1057 } 1058 1059 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData); 1060 1061 // Older versions of dbghelp.h do not contain all the dumptypes we want, dbghelp.h with 1062 // API_VERSION_NUMBER 11 or higher contains the ones we want though 1063 #if API_VERSION_NUMBER >= 11 1064 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | 1065 MiniDumpWithUnloadedModules); 1066 #endif 1067 1068 if (siginfo != NULL && context != NULL) { 1069 ep.ContextRecord = (PCONTEXT) context; 1070 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo; 1071 1072 mei.ThreadId = GetCurrentThreadId(); 1073 mei.ExceptionPointers = &ep; 1074 pmei = &mei; 1075 } else { 1076 pmei = NULL; 1077 } 1078 1079 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all 1080 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then. 1081 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false && 1082 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) { 1083 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError()); 1084 } 1085 CloseHandle(dumpFile); 1086 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1087 } 1088 1089 void os::abort(bool dump_core) { 1090 abort(dump_core, NULL, NULL); 1091 } 1092 1093 // Die immediately, no exit hook, no abort hook, no cleanup. 1094 void os::die() { 1095 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1); 1096 } 1097 1098 // Directory routines copied from src/win32/native/java/io/dirent_md.c 1099 // * dirent_md.c 1.15 00/02/02 1100 // 1101 // The declarations for DIR and struct dirent are in jvm_win32.h. 1102 1103 // Caller must have already run dirname through JVM_NativePath, which removes 1104 // duplicate slashes and converts all instances of '/' into '\\'. 1105 1106 DIR * os::opendir(const char *dirname) { 1107 assert(dirname != NULL, "just checking"); // hotspot change 1108 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal); 1109 DWORD fattr; // hotspot change 1110 char alt_dirname[4] = { 0, 0, 0, 0 }; 1111 1112 if (dirp == 0) { 1113 errno = ENOMEM; 1114 return 0; 1115 } 1116 1117 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it 1118 // as a directory in FindFirstFile(). We detect this case here and 1119 // prepend the current drive name. 1120 // 1121 if (dirname[1] == '\0' && dirname[0] == '\\') { 1122 alt_dirname[0] = _getdrive() + 'A' - 1; 1123 alt_dirname[1] = ':'; 1124 alt_dirname[2] = '\\'; 1125 alt_dirname[3] = '\0'; 1126 dirname = alt_dirname; 1127 } 1128 1129 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal); 1130 if (dirp->path == 0) { 1131 free(dirp); 1132 errno = ENOMEM; 1133 return 0; 1134 } 1135 strcpy(dirp->path, dirname); 1136 1137 fattr = GetFileAttributes(dirp->path); 1138 if (fattr == 0xffffffff) { 1139 free(dirp->path); 1140 free(dirp); 1141 errno = ENOENT; 1142 return 0; 1143 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 1144 free(dirp->path); 1145 free(dirp); 1146 errno = ENOTDIR; 1147 return 0; 1148 } 1149 1150 // Append "*.*", or possibly "\\*.*", to path 1151 if (dirp->path[1] == ':' && 1152 (dirp->path[2] == '\0' || 1153 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 1154 // No '\\' needed for cases like "Z:" or "Z:\" 1155 strcat(dirp->path, "*.*"); 1156 } else { 1157 strcat(dirp->path, "\\*.*"); 1158 } 1159 1160 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 1161 if (dirp->handle == INVALID_HANDLE_VALUE) { 1162 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 1163 free(dirp->path); 1164 free(dirp); 1165 errno = EACCES; 1166 return 0; 1167 } 1168 } 1169 return dirp; 1170 } 1171 1172 // parameter dbuf unused on Windows 1173 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) { 1174 assert(dirp != NULL, "just checking"); // hotspot change 1175 if (dirp->handle == INVALID_HANDLE_VALUE) { 1176 return 0; 1177 } 1178 1179 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 1180 1181 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 1182 if (GetLastError() == ERROR_INVALID_HANDLE) { 1183 errno = EBADF; 1184 return 0; 1185 } 1186 FindClose(dirp->handle); 1187 dirp->handle = INVALID_HANDLE_VALUE; 1188 } 1189 1190 return &dirp->dirent; 1191 } 1192 1193 int os::closedir(DIR *dirp) { 1194 assert(dirp != NULL, "just checking"); // hotspot change 1195 if (dirp->handle != INVALID_HANDLE_VALUE) { 1196 if (!FindClose(dirp->handle)) { 1197 errno = EBADF; 1198 return -1; 1199 } 1200 dirp->handle = INVALID_HANDLE_VALUE; 1201 } 1202 free(dirp->path); 1203 free(dirp); 1204 return 0; 1205 } 1206 1207 // This must be hard coded because it's the system's temporary 1208 // directory not the java application's temp directory, ala java.io.tmpdir. 1209 const char* os::get_temp_directory() { 1210 static char path_buf[MAX_PATH]; 1211 if (GetTempPath(MAX_PATH, path_buf) > 0) { 1212 return path_buf; 1213 } else { 1214 path_buf[0] = '\0'; 1215 return path_buf; 1216 } 1217 } 1218 1219 static bool file_exists(const char* filename) { 1220 if (filename == NULL || strlen(filename) == 0) { 1221 return false; 1222 } 1223 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES; 1224 } 1225 1226 bool os::dll_build_name(char *buffer, size_t buflen, 1227 const char* pname, const char* fname) { 1228 bool retval = false; 1229 const size_t pnamelen = pname ? strlen(pname) : 0; 1230 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0; 1231 1232 // Return error on buffer overflow. 1233 if (pnamelen + strlen(fname) + 10 > buflen) { 1234 return retval; 1235 } 1236 1237 if (pnamelen == 0) { 1238 jio_snprintf(buffer, buflen, "%s.dll", fname); 1239 retval = true; 1240 } else if (c == ':' || c == '\\') { 1241 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname); 1242 retval = true; 1243 } else if (strchr(pname, *os::path_separator()) != NULL) { 1244 int n; 1245 char** pelements = split_path(pname, &n); 1246 if (pelements == NULL) { 1247 return false; 1248 } 1249 for (int i = 0; i < n; i++) { 1250 char* path = pelements[i]; 1251 // Really shouldn't be NULL, but check can't hurt 1252 size_t plen = (path == NULL) ? 0 : strlen(path); 1253 if (plen == 0) { 1254 continue; // skip the empty path values 1255 } 1256 const char lastchar = path[plen - 1]; 1257 if (lastchar == ':' || lastchar == '\\') { 1258 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname); 1259 } else { 1260 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname); 1261 } 1262 if (file_exists(buffer)) { 1263 retval = true; 1264 break; 1265 } 1266 } 1267 // release the storage 1268 for (int i = 0; i < n; i++) { 1269 if (pelements[i] != NULL) { 1270 FREE_C_HEAP_ARRAY(char, pelements[i]); 1271 } 1272 } 1273 if (pelements != NULL) { 1274 FREE_C_HEAP_ARRAY(char*, pelements); 1275 } 1276 } else { 1277 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname); 1278 retval = true; 1279 } 1280 return retval; 1281 } 1282 1283 // Needs to be in os specific directory because windows requires another 1284 // header file <direct.h> 1285 const char* os::get_current_directory(char *buf, size_t buflen) { 1286 int n = static_cast<int>(buflen); 1287 if (buflen > INT_MAX) n = INT_MAX; 1288 return _getcwd(buf, n); 1289 } 1290 1291 //----------------------------------------------------------- 1292 // Helper functions for fatal error handler 1293 #ifdef _WIN64 1294 // Helper routine which returns true if address in 1295 // within the NTDLL address space. 1296 // 1297 static bool _addr_in_ntdll(address addr) { 1298 HMODULE hmod; 1299 MODULEINFO minfo; 1300 1301 hmod = GetModuleHandle("NTDLL.DLL"); 1302 if (hmod == NULL) return false; 1303 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod, 1304 &minfo, sizeof(MODULEINFO))) { 1305 return false; 1306 } 1307 1308 if ((addr >= minfo.lpBaseOfDll) && 1309 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) { 1310 return true; 1311 } else { 1312 return false; 1313 } 1314 } 1315 #endif 1316 1317 struct _modinfo { 1318 address addr; 1319 char* full_path; // point to a char buffer 1320 int buflen; // size of the buffer 1321 address base_addr; 1322 }; 1323 1324 static int _locate_module_by_addr(const char * mod_fname, address base_addr, 1325 address top_address, void * param) { 1326 struct _modinfo *pmod = (struct _modinfo *)param; 1327 if (!pmod) return -1; 1328 1329 if (base_addr <= pmod->addr && 1330 top_address > pmod->addr) { 1331 // if a buffer is provided, copy path name to the buffer 1332 if (pmod->full_path) { 1333 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1334 } 1335 pmod->base_addr = base_addr; 1336 return 1; 1337 } 1338 return 0; 1339 } 1340 1341 bool os::dll_address_to_library_name(address addr, char* buf, 1342 int buflen, int* offset) { 1343 // buf is not optional, but offset is optional 1344 assert(buf != NULL, "sanity check"); 1345 1346 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1347 // return the full path to the DLL file, sometimes it returns path 1348 // to the corresponding PDB file (debug info); sometimes it only 1349 // returns partial path, which makes life painful. 1350 1351 struct _modinfo mi; 1352 mi.addr = addr; 1353 mi.full_path = buf; 1354 mi.buflen = buflen; 1355 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) { 1356 // buf already contains path name 1357 if (offset) *offset = addr - mi.base_addr; 1358 return true; 1359 } 1360 1361 buf[0] = '\0'; 1362 if (offset) *offset = -1; 1363 return false; 1364 } 1365 1366 bool os::dll_address_to_function_name(address addr, char *buf, 1367 int buflen, int *offset) { 1368 // buf is not optional, but offset is optional 1369 assert(buf != NULL, "sanity check"); 1370 1371 if (Decoder::decode(addr, buf, buflen, offset)) { 1372 return true; 1373 } 1374 if (offset != NULL) *offset = -1; 1375 buf[0] = '\0'; 1376 return false; 1377 } 1378 1379 // save the start and end address of jvm.dll into param[0] and param[1] 1380 static int _locate_jvm_dll(const char* mod_fname, address base_addr, 1381 address top_address, void * param) { 1382 if (!param) return -1; 1383 1384 if (base_addr <= (address)_locate_jvm_dll && 1385 top_address > (address)_locate_jvm_dll) { 1386 ((address*)param)[0] = base_addr; 1387 ((address*)param)[1] = top_address; 1388 return 1; 1389 } 1390 return 0; 1391 } 1392 1393 address vm_lib_location[2]; // start and end address of jvm.dll 1394 1395 // check if addr is inside jvm.dll 1396 bool os::address_is_in_vm(address addr) { 1397 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1398 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) { 1399 assert(false, "Can't find jvm module."); 1400 return false; 1401 } 1402 } 1403 1404 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1405 } 1406 1407 // print module info; param is outputStream* 1408 static int _print_module(const char* fname, address base_address, 1409 address top_address, void* param) { 1410 if (!param) return -1; 1411 1412 outputStream* st = (outputStream*)param; 1413 1414 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname); 1415 return 0; 1416 } 1417 1418 // Loads .dll/.so and 1419 // in case of error it checks if .dll/.so was built for the 1420 // same architecture as Hotspot is running on 1421 void * os::dll_load(const char *name, char *ebuf, int ebuflen) { 1422 void * result = LoadLibrary(name); 1423 if (result != NULL) { 1424 return result; 1425 } 1426 1427 DWORD errcode = GetLastError(); 1428 if (errcode == ERROR_MOD_NOT_FOUND) { 1429 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1); 1430 ebuf[ebuflen - 1] = '\0'; 1431 return NULL; 1432 } 1433 1434 // Parsing dll below 1435 // If we can read dll-info and find that dll was built 1436 // for an architecture other than Hotspot is running in 1437 // - then print to buffer "DLL was built for a different architecture" 1438 // else call os::lasterror to obtain system error message 1439 1440 // Read system error message into ebuf 1441 // It may or may not be overwritten below (in the for loop and just above) 1442 lasterror(ebuf, (size_t) ebuflen); 1443 ebuf[ebuflen - 1] = '\0'; 1444 int fd = ::open(name, O_RDONLY | O_BINARY, 0); 1445 if (fd < 0) { 1446 return NULL; 1447 } 1448 1449 uint32_t signature_offset; 1450 uint16_t lib_arch = 0; 1451 bool failed_to_get_lib_arch = 1452 ( // Go to position 3c in the dll 1453 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0) 1454 || 1455 // Read location of signature 1456 (sizeof(signature_offset) != 1457 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset)))) 1458 || 1459 // Go to COFF File Header in dll 1460 // that is located after "signature" (4 bytes long) 1461 (os::seek_to_file_offset(fd, 1462 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0) 1463 || 1464 // Read field that contains code of architecture 1465 // that dll was built for 1466 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch)))) 1467 ); 1468 1469 ::close(fd); 1470 if (failed_to_get_lib_arch) { 1471 // file i/o error - report os::lasterror(...) msg 1472 return NULL; 1473 } 1474 1475 typedef struct { 1476 uint16_t arch_code; 1477 char* arch_name; 1478 } arch_t; 1479 1480 static const arch_t arch_array[] = { 1481 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1482 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1483 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1484 }; 1485 #if (defined _M_IA64) 1486 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64; 1487 #elif (defined _M_AMD64) 1488 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64; 1489 #elif (defined _M_IX86) 1490 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386; 1491 #else 1492 #error Method os::dll_load requires that one of following \ 1493 is defined :_M_IA64,_M_AMD64 or _M_IX86 1494 #endif 1495 1496 1497 // Obtain a string for printf operation 1498 // lib_arch_str shall contain string what platform this .dll was built for 1499 // running_arch_str shall string contain what platform Hotspot was built for 1500 char *running_arch_str = NULL, *lib_arch_str = NULL; 1501 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) { 1502 if (lib_arch == arch_array[i].arch_code) { 1503 lib_arch_str = arch_array[i].arch_name; 1504 } 1505 if (running_arch == arch_array[i].arch_code) { 1506 running_arch_str = arch_array[i].arch_name; 1507 } 1508 } 1509 1510 assert(running_arch_str, 1511 "Didn't find running architecture code in arch_array"); 1512 1513 // If the architecture is right 1514 // but some other error took place - report os::lasterror(...) msg 1515 if (lib_arch == running_arch) { 1516 return NULL; 1517 } 1518 1519 if (lib_arch_str != NULL) { 1520 ::_snprintf(ebuf, ebuflen - 1, 1521 "Can't load %s-bit .dll on a %s-bit platform", 1522 lib_arch_str, running_arch_str); 1523 } else { 1524 // don't know what architecture this dll was build for 1525 ::_snprintf(ebuf, ebuflen - 1, 1526 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1527 lib_arch, running_arch_str); 1528 } 1529 1530 return NULL; 1531 } 1532 1533 void os::print_dll_info(outputStream *st) { 1534 st->print_cr("Dynamic libraries:"); 1535 get_loaded_modules_info(_print_module, (void *)st); 1536 } 1537 1538 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1539 HANDLE hProcess; 1540 1541 # define MAX_NUM_MODULES 128 1542 HMODULE modules[MAX_NUM_MODULES]; 1543 static char filename[MAX_PATH]; 1544 int result = 0; 1545 1546 if (!os::PSApiDll::PSApiAvailable()) { 1547 return 0; 1548 } 1549 1550 int pid = os::current_process_id(); 1551 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1552 FALSE, pid); 1553 if (hProcess == NULL) return 0; 1554 1555 DWORD size_needed; 1556 if (!os::PSApiDll::EnumProcessModules(hProcess, modules, 1557 sizeof(modules), &size_needed)) { 1558 CloseHandle(hProcess); 1559 return 0; 1560 } 1561 1562 // number of modules that are currently loaded 1563 int num_modules = size_needed / sizeof(HMODULE); 1564 1565 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1566 // Get Full pathname: 1567 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i], 1568 filename, sizeof(filename))) { 1569 filename[0] = '\0'; 1570 } 1571 1572 MODULEINFO modinfo; 1573 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i], 1574 &modinfo, sizeof(modinfo))) { 1575 modinfo.lpBaseOfDll = NULL; 1576 modinfo.SizeOfImage = 0; 1577 } 1578 1579 // Invoke callback function 1580 result = callback(filename, (address)modinfo.lpBaseOfDll, 1581 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param); 1582 if (result) break; 1583 } 1584 1585 CloseHandle(hProcess); 1586 return result; 1587 } 1588 1589 void os::print_os_info_brief(outputStream* st) { 1590 os::print_os_info(st); 1591 } 1592 1593 void os::print_os_info(outputStream* st) { 1594 #ifdef ASSERT 1595 char buffer[1024]; 1596 DWORD size = sizeof(buffer); 1597 st->print(" HostName: "); 1598 if (GetComputerNameEx(ComputerNameDnsHostname, buffer, &size)) { 1599 st->print("%s", buffer); 1600 } else { 1601 st->print("N/A"); 1602 } 1603 #endif 1604 st->print(" OS:"); 1605 os::win32::print_windows_version(st); 1606 } 1607 1608 void os::win32::print_windows_version(outputStream* st) { 1609 OSVERSIONINFOEX osvi; 1610 VS_FIXEDFILEINFO *file_info; 1611 TCHAR kernel32_path[MAX_PATH]; 1612 UINT len, ret; 1613 1614 // Use the GetVersionEx information to see if we're on a server or 1615 // workstation edition of Windows. Starting with Windows 8.1 we can't 1616 // trust the OS version information returned by this API. 1617 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1618 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1619 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1620 st->print_cr("Call to GetVersionEx failed"); 1621 return; 1622 } 1623 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION); 1624 1625 // Get the full path to \Windows\System32\kernel32.dll and use that for 1626 // determining what version of Windows we're running on. 1627 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1; 1628 ret = GetSystemDirectory(kernel32_path, len); 1629 if (ret == 0 || ret > len) { 1630 st->print_cr("Call to GetSystemDirectory failed"); 1631 return; 1632 } 1633 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret); 1634 1635 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL); 1636 if (version_size == 0) { 1637 st->print_cr("Call to GetFileVersionInfoSize failed"); 1638 return; 1639 } 1640 1641 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal); 1642 if (version_info == NULL) { 1643 st->print_cr("Failed to allocate version_info"); 1644 return; 1645 } 1646 1647 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) { 1648 os::free(version_info); 1649 st->print_cr("Call to GetFileVersionInfo failed"); 1650 return; 1651 } 1652 1653 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) { 1654 os::free(version_info); 1655 st->print_cr("Call to VerQueryValue failed"); 1656 return; 1657 } 1658 1659 int major_version = HIWORD(file_info->dwProductVersionMS); 1660 int minor_version = LOWORD(file_info->dwProductVersionMS); 1661 int build_number = HIWORD(file_info->dwProductVersionLS); 1662 int build_minor = LOWORD(file_info->dwProductVersionLS); 1663 int os_vers = major_version * 1000 + minor_version; 1664 os::free(version_info); 1665 1666 st->print(" Windows "); 1667 switch (os_vers) { 1668 1669 case 6000: 1670 if (is_workstation) { 1671 st->print("Vista"); 1672 } else { 1673 st->print("Server 2008"); 1674 } 1675 break; 1676 1677 case 6001: 1678 if (is_workstation) { 1679 st->print("7"); 1680 } else { 1681 st->print("Server 2008 R2"); 1682 } 1683 break; 1684 1685 case 6002: 1686 if (is_workstation) { 1687 st->print("8"); 1688 } else { 1689 st->print("Server 2012"); 1690 } 1691 break; 1692 1693 case 6003: 1694 if (is_workstation) { 1695 st->print("8.1"); 1696 } else { 1697 st->print("Server 2012 R2"); 1698 } 1699 break; 1700 1701 case 10000: 1702 if (is_workstation) { 1703 st->print("10"); 1704 } else { 1705 // The server version name of Windows 10 is not known at this time 1706 st->print("%d.%d", major_version, minor_version); 1707 } 1708 break; 1709 1710 default: 1711 // Unrecognized windows, print out its major and minor versions 1712 st->print("%d.%d", major_version, minor_version); 1713 break; 1714 } 1715 1716 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1717 // find out whether we are running on 64 bit processor or not 1718 SYSTEM_INFO si; 1719 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1720 os::Kernel32Dll::GetNativeSystemInfo(&si); 1721 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1722 st->print(" , 64 bit"); 1723 } 1724 1725 st->print(" Build %d", build_number); 1726 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor); 1727 st->cr(); 1728 } 1729 1730 void os::pd_print_cpu_info(outputStream* st) { 1731 // Nothing to do for now. 1732 } 1733 1734 void os::print_memory_info(outputStream* st) { 1735 st->print("Memory:"); 1736 st->print(" %dk page", os::vm_page_size()>>10); 1737 1738 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1739 // value if total memory is larger than 4GB 1740 MEMORYSTATUSEX ms; 1741 ms.dwLength = sizeof(ms); 1742 GlobalMemoryStatusEx(&ms); 1743 1744 st->print(", physical %uk", os::physical_memory() >> 10); 1745 st->print("(%uk free)", os::available_memory() >> 10); 1746 1747 st->print(", swap %uk", ms.ullTotalPageFile >> 10); 1748 st->print("(%uk free)", ms.ullAvailPageFile >> 10); 1749 st->cr(); 1750 } 1751 1752 void os::print_siginfo(outputStream *st, void *siginfo) { 1753 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1754 st->print("siginfo:"); 1755 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1756 1757 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1758 er->NumberParameters >= 2) { 1759 switch (er->ExceptionInformation[0]) { 1760 case 0: st->print(", reading address"); break; 1761 case 1: st->print(", writing address"); break; 1762 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1763 er->ExceptionInformation[0]); 1764 } 1765 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1766 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1767 er->NumberParameters >= 2 && UseSharedSpaces) { 1768 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1769 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1770 st->print("\n\nError accessing class data sharing archive." \ 1771 " Mapped file inaccessible during execution, " \ 1772 " possible disk/network problem."); 1773 } 1774 } else { 1775 int num = er->NumberParameters; 1776 if (num > 0) { 1777 st->print(", ExceptionInformation="); 1778 for (int i = 0; i < num; i++) { 1779 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1780 } 1781 } 1782 } 1783 st->cr(); 1784 } 1785 1786 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1787 // do nothing 1788 } 1789 1790 static char saved_jvm_path[MAX_PATH] = {0}; 1791 1792 // Find the full path to the current module, jvm.dll 1793 void os::jvm_path(char *buf, jint buflen) { 1794 // Error checking. 1795 if (buflen < MAX_PATH) { 1796 assert(false, "must use a large-enough buffer"); 1797 buf[0] = '\0'; 1798 return; 1799 } 1800 // Lazy resolve the path to current module. 1801 if (saved_jvm_path[0] != 0) { 1802 strcpy(buf, saved_jvm_path); 1803 return; 1804 } 1805 1806 buf[0] = '\0'; 1807 if (Arguments::sun_java_launcher_is_altjvm()) { 1808 // Support for the java launcher's '-XXaltjvm=<path>' option. Check 1809 // for a JAVA_HOME environment variable and fix up the path so it 1810 // looks like jvm.dll is installed there (append a fake suffix 1811 // hotspot/jvm.dll). 1812 char* java_home_var = ::getenv("JAVA_HOME"); 1813 if (java_home_var != NULL && java_home_var[0] != 0 && 1814 strlen(java_home_var) < (size_t)buflen) { 1815 strncpy(buf, java_home_var, buflen); 1816 1817 // determine if this is a legacy image or modules image 1818 // modules image doesn't have "jre" subdirectory 1819 size_t len = strlen(buf); 1820 char* jrebin_p = buf + len; 1821 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1822 if (0 != _access(buf, 0)) { 1823 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1824 } 1825 len = strlen(buf); 1826 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1827 } 1828 } 1829 1830 if (buf[0] == '\0') { 1831 GetModuleFileName(vm_lib_handle, buf, buflen); 1832 } 1833 strncpy(saved_jvm_path, buf, MAX_PATH); 1834 saved_jvm_path[MAX_PATH - 1] = '\0'; 1835 } 1836 1837 1838 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1839 #ifndef _WIN64 1840 st->print("_"); 1841 #endif 1842 } 1843 1844 1845 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1846 #ifndef _WIN64 1847 st->print("@%d", args_size * sizeof(int)); 1848 #endif 1849 } 1850 1851 // This method is a copy of JDK's sysGetLastErrorString 1852 // from src/windows/hpi/src/system_md.c 1853 1854 size_t os::lasterror(char* buf, size_t len) { 1855 DWORD errval; 1856 1857 if ((errval = GetLastError()) != 0) { 1858 // DOS error 1859 size_t n = (size_t)FormatMessage( 1860 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1861 NULL, 1862 errval, 1863 0, 1864 buf, 1865 (DWORD)len, 1866 NULL); 1867 if (n > 3) { 1868 // Drop final '.', CR, LF 1869 if (buf[n - 1] == '\n') n--; 1870 if (buf[n - 1] == '\r') n--; 1871 if (buf[n - 1] == '.') n--; 1872 buf[n] = '\0'; 1873 } 1874 return n; 1875 } 1876 1877 if (errno != 0) { 1878 // C runtime error that has no corresponding DOS error code 1879 const char* s = strerror(errno); 1880 size_t n = strlen(s); 1881 if (n >= len) n = len - 1; 1882 strncpy(buf, s, n); 1883 buf[n] = '\0'; 1884 return n; 1885 } 1886 1887 return 0; 1888 } 1889 1890 int os::get_last_error() { 1891 DWORD error = GetLastError(); 1892 if (error == 0) { 1893 error = errno; 1894 } 1895 return (int)error; 1896 } 1897 1898 // sun.misc.Signal 1899 // NOTE that this is a workaround for an apparent kernel bug where if 1900 // a signal handler for SIGBREAK is installed then that signal handler 1901 // takes priority over the console control handler for CTRL_CLOSE_EVENT. 1902 // See bug 4416763. 1903 static void (*sigbreakHandler)(int) = NULL; 1904 1905 static void UserHandler(int sig, void *siginfo, void *context) { 1906 os::signal_notify(sig); 1907 // We need to reinstate the signal handler each time... 1908 os::signal(sig, (void*)UserHandler); 1909 } 1910 1911 void* os::user_handler() { 1912 return (void*) UserHandler; 1913 } 1914 1915 void* os::signal(int signal_number, void* handler) { 1916 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1917 void (*oldHandler)(int) = sigbreakHandler; 1918 sigbreakHandler = (void (*)(int)) handler; 1919 return (void*) oldHandler; 1920 } else { 1921 return (void*)::signal(signal_number, (void (*)(int))handler); 1922 } 1923 } 1924 1925 void os::signal_raise(int signal_number) { 1926 raise(signal_number); 1927 } 1928 1929 // The Win32 C runtime library maps all console control events other than ^C 1930 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1931 // logoff, and shutdown events. We therefore install our own console handler 1932 // that raises SIGTERM for the latter cases. 1933 // 1934 static BOOL WINAPI consoleHandler(DWORD event) { 1935 switch (event) { 1936 case CTRL_C_EVENT: 1937 if (is_error_reported()) { 1938 // Ctrl-C is pressed during error reporting, likely because the error 1939 // handler fails to abort. Let VM die immediately. 1940 os::die(); 1941 } 1942 1943 os::signal_raise(SIGINT); 1944 return TRUE; 1945 break; 1946 case CTRL_BREAK_EVENT: 1947 if (sigbreakHandler != NULL) { 1948 (*sigbreakHandler)(SIGBREAK); 1949 } 1950 return TRUE; 1951 break; 1952 case CTRL_LOGOFF_EVENT: { 1953 // Don't terminate JVM if it is running in a non-interactive session, 1954 // such as a service process. 1955 USEROBJECTFLAGS flags; 1956 HANDLE handle = GetProcessWindowStation(); 1957 if (handle != NULL && 1958 GetUserObjectInformation(handle, UOI_FLAGS, &flags, 1959 sizeof(USEROBJECTFLAGS), NULL)) { 1960 // If it is a non-interactive session, let next handler to deal 1961 // with it. 1962 if ((flags.dwFlags & WSF_VISIBLE) == 0) { 1963 return FALSE; 1964 } 1965 } 1966 } 1967 case CTRL_CLOSE_EVENT: 1968 case CTRL_SHUTDOWN_EVENT: 1969 os::signal_raise(SIGTERM); 1970 return TRUE; 1971 break; 1972 default: 1973 break; 1974 } 1975 return FALSE; 1976 } 1977 1978 // The following code is moved from os.cpp for making this 1979 // code platform specific, which it is by its very nature. 1980 1981 // Return maximum OS signal used + 1 for internal use only 1982 // Used as exit signal for signal_thread 1983 int os::sigexitnum_pd() { 1984 return NSIG; 1985 } 1986 1987 // a counter for each possible signal value, including signal_thread exit signal 1988 static volatile jint pending_signals[NSIG+1] = { 0 }; 1989 static HANDLE sig_sem = NULL; 1990 1991 void os::signal_init_pd() { 1992 // Initialize signal structures 1993 memset((void*)pending_signals, 0, sizeof(pending_signals)); 1994 1995 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 1996 1997 // Programs embedding the VM do not want it to attempt to receive 1998 // events like CTRL_LOGOFF_EVENT, which are used to implement the 1999 // shutdown hooks mechanism introduced in 1.3. For example, when 2000 // the VM is run as part of a Windows NT service (i.e., a servlet 2001 // engine in a web server), the correct behavior is for any console 2002 // control handler to return FALSE, not TRUE, because the OS's 2003 // "final" handler for such events allows the process to continue if 2004 // it is a service (while terminating it if it is not a service). 2005 // To make this behavior uniform and the mechanism simpler, we 2006 // completely disable the VM's usage of these console events if -Xrs 2007 // (=ReduceSignalUsage) is specified. This means, for example, that 2008 // the CTRL-BREAK thread dump mechanism is also disabled in this 2009 // case. See bugs 4323062, 4345157, and related bugs. 2010 2011 if (!ReduceSignalUsage) { 2012 // Add a CTRL-C handler 2013 SetConsoleCtrlHandler(consoleHandler, TRUE); 2014 } 2015 } 2016 2017 void os::signal_notify(int signal_number) { 2018 BOOL ret; 2019 if (sig_sem != NULL) { 2020 Atomic::inc(&pending_signals[signal_number]); 2021 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2022 assert(ret != 0, "ReleaseSemaphore() failed"); 2023 } 2024 } 2025 2026 static int check_pending_signals(bool wait_for_signal) { 2027 DWORD ret; 2028 while (true) { 2029 for (int i = 0; i < NSIG + 1; i++) { 2030 jint n = pending_signals[i]; 2031 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2032 return i; 2033 } 2034 } 2035 if (!wait_for_signal) { 2036 return -1; 2037 } 2038 2039 JavaThread *thread = JavaThread::current(); 2040 2041 ThreadBlockInVM tbivm(thread); 2042 2043 bool threadIsSuspended; 2044 do { 2045 thread->set_suspend_equivalent(); 2046 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2047 ret = ::WaitForSingleObject(sig_sem, INFINITE); 2048 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 2049 2050 // were we externally suspended while we were waiting? 2051 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2052 if (threadIsSuspended) { 2053 // The semaphore has been incremented, but while we were waiting 2054 // another thread suspended us. We don't want to continue running 2055 // while suspended because that would surprise the thread that 2056 // suspended us. 2057 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2058 assert(ret != 0, "ReleaseSemaphore() failed"); 2059 2060 thread->java_suspend_self(); 2061 } 2062 } while (threadIsSuspended); 2063 } 2064 } 2065 2066 int os::signal_lookup() { 2067 return check_pending_signals(false); 2068 } 2069 2070 int os::signal_wait() { 2071 return check_pending_signals(true); 2072 } 2073 2074 // Implicit OS exception handling 2075 2076 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, 2077 address handler) { 2078 JavaThread* thread = JavaThread::current(); 2079 // Save pc in thread 2080 #ifdef _M_IA64 2081 // Do not blow up if no thread info available. 2082 if (thread) { 2083 // Saving PRECISE pc (with slot information) in thread. 2084 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress; 2085 // Convert precise PC into "Unix" format 2086 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2); 2087 thread->set_saved_exception_pc((address)precise_pc); 2088 } 2089 // Set pc to handler 2090 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 2091 // Clear out psr.ri (= Restart Instruction) in order to continue 2092 // at the beginning of the target bundle. 2093 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF; 2094 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!"); 2095 #else 2096 #ifdef _M_AMD64 2097 // Do not blow up if no thread info available. 2098 if (thread) { 2099 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip); 2100 } 2101 // Set pc to handler 2102 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 2103 #else 2104 // Do not blow up if no thread info available. 2105 if (thread) { 2106 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip); 2107 } 2108 // Set pc to handler 2109 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler; 2110 #endif 2111 #endif 2112 2113 // Continue the execution 2114 return EXCEPTION_CONTINUE_EXECUTION; 2115 } 2116 2117 2118 // Used for PostMortemDump 2119 extern "C" void safepoints(); 2120 extern "C" void find(int x); 2121 extern "C" void events(); 2122 2123 // According to Windows API documentation, an illegal instruction sequence should generate 2124 // the 0xC000001C exception code. However, real world experience shows that occasionnaly 2125 // the execution of an illegal instruction can generate the exception code 0xC000001E. This 2126 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 2127 2128 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 2129 2130 // From "Execution Protection in the Windows Operating System" draft 0.35 2131 // Once a system header becomes available, the "real" define should be 2132 // included or copied here. 2133 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2134 2135 // Handle NAT Bit consumption on IA64. 2136 #ifdef _M_IA64 2137 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION 2138 #endif 2139 2140 // Windows Vista/2008 heap corruption check 2141 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374 2142 2143 #define def_excpt(val) #val, val 2144 2145 struct siglabel { 2146 char *name; 2147 int number; 2148 }; 2149 2150 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual 2151 // C++ compiler contain this error code. Because this is a compiler-generated 2152 // error, the code is not listed in the Win32 API header files. 2153 // The code is actually a cryptic mnemonic device, with the initial "E" 2154 // standing for "exception" and the final 3 bytes (0x6D7363) representing the 2155 // ASCII values of "msc". 2156 2157 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363 2158 2159 2160 struct siglabel exceptlabels[] = { 2161 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2162 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2163 def_excpt(EXCEPTION_BREAKPOINT), 2164 def_excpt(EXCEPTION_SINGLE_STEP), 2165 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2166 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2167 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2168 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2169 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2170 def_excpt(EXCEPTION_FLT_OVERFLOW), 2171 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2172 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2173 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2174 def_excpt(EXCEPTION_INT_OVERFLOW), 2175 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2176 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2177 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2178 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2179 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2180 def_excpt(EXCEPTION_STACK_OVERFLOW), 2181 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2182 def_excpt(EXCEPTION_GUARD_PAGE), 2183 def_excpt(EXCEPTION_INVALID_HANDLE), 2184 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION), 2185 def_excpt(EXCEPTION_HEAP_CORRUPTION), 2186 #ifdef _M_IA64 2187 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION), 2188 #endif 2189 NULL, 0 2190 }; 2191 2192 const char* os::exception_name(int exception_code, char *buf, size_t size) { 2193 for (int i = 0; exceptlabels[i].name != NULL; i++) { 2194 if (exceptlabels[i].number == exception_code) { 2195 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2196 return buf; 2197 } 2198 } 2199 2200 return NULL; 2201 } 2202 2203 //----------------------------------------------------------------------------- 2204 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2205 // handle exception caused by idiv; should only happen for -MinInt/-1 2206 // (division by zero is handled explicitly) 2207 #ifdef _M_IA64 2208 assert(0, "Fix Handle_IDiv_Exception"); 2209 #else 2210 #ifdef _M_AMD64 2211 PCONTEXT ctx = exceptionInfo->ContextRecord; 2212 address pc = (address)ctx->Rip; 2213 assert(pc[0] == 0xF7, "not an idiv opcode"); 2214 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2215 assert(ctx->Rax == min_jint, "unexpected idiv exception"); 2216 // set correct result values and continue after idiv instruction 2217 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2218 ctx->Rax = (DWORD)min_jint; // result 2219 ctx->Rdx = (DWORD)0; // remainder 2220 // Continue the execution 2221 #else 2222 PCONTEXT ctx = exceptionInfo->ContextRecord; 2223 address pc = (address)ctx->Eip; 2224 assert(pc[0] == 0xF7, "not an idiv opcode"); 2225 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2226 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2227 // set correct result values and continue after idiv instruction 2228 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2229 ctx->Eax = (DWORD)min_jint; // result 2230 ctx->Edx = (DWORD)0; // remainder 2231 // Continue the execution 2232 #endif 2233 #endif 2234 return EXCEPTION_CONTINUE_EXECUTION; 2235 } 2236 2237 //----------------------------------------------------------------------------- 2238 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2239 PCONTEXT ctx = exceptionInfo->ContextRecord; 2240 #ifndef _WIN64 2241 // handle exception caused by native method modifying control word 2242 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2243 2244 switch (exception_code) { 2245 case EXCEPTION_FLT_DENORMAL_OPERAND: 2246 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2247 case EXCEPTION_FLT_INEXACT_RESULT: 2248 case EXCEPTION_FLT_INVALID_OPERATION: 2249 case EXCEPTION_FLT_OVERFLOW: 2250 case EXCEPTION_FLT_STACK_CHECK: 2251 case EXCEPTION_FLT_UNDERFLOW: 2252 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2253 if (fp_control_word != ctx->FloatSave.ControlWord) { 2254 // Restore FPCW and mask out FLT exceptions 2255 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2256 // Mask out pending FLT exceptions 2257 ctx->FloatSave.StatusWord &= 0xffffff00; 2258 return EXCEPTION_CONTINUE_EXECUTION; 2259 } 2260 } 2261 2262 if (prev_uef_handler != NULL) { 2263 // We didn't handle this exception so pass it to the previous 2264 // UnhandledExceptionFilter. 2265 return (prev_uef_handler)(exceptionInfo); 2266 } 2267 #else // !_WIN64 2268 // On Windows, the mxcsr control bits are non-volatile across calls 2269 // See also CR 6192333 2270 // 2271 jint MxCsr = INITIAL_MXCSR; 2272 // we can't use StubRoutines::addr_mxcsr_std() 2273 // because in Win64 mxcsr is not saved there 2274 if (MxCsr != ctx->MxCsr) { 2275 ctx->MxCsr = MxCsr; 2276 return EXCEPTION_CONTINUE_EXECUTION; 2277 } 2278 #endif // !_WIN64 2279 2280 return EXCEPTION_CONTINUE_SEARCH; 2281 } 2282 2283 static inline void report_error(Thread* t, DWORD exception_code, 2284 address addr, void* siginfo, void* context) { 2285 VMError err(t, exception_code, addr, siginfo, context); 2286 err.report_and_die(); 2287 2288 // If UseOsErrorReporting, this will return here and save the error file 2289 // somewhere where we can find it in the minidump. 2290 } 2291 2292 //----------------------------------------------------------------------------- 2293 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2294 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2295 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2296 #ifdef _M_IA64 2297 // On Itanium, we need the "precise pc", which has the slot number coded 2298 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format). 2299 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress; 2300 // Convert the pc to "Unix format", which has the slot number coded 2301 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2 2302 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction" 2303 // information is saved in the Unix format. 2304 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2)); 2305 #else 2306 #ifdef _M_AMD64 2307 address pc = (address) exceptionInfo->ContextRecord->Rip; 2308 #else 2309 address pc = (address) exceptionInfo->ContextRecord->Eip; 2310 #endif 2311 #endif 2312 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 2313 2314 // Handle SafeFetch32 and SafeFetchN exceptions. 2315 if (StubRoutines::is_safefetch_fault(pc)) { 2316 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc)); 2317 } 2318 2319 #ifndef _WIN64 2320 // Execution protection violation - win32 running on AMD64 only 2321 // Handled first to avoid misdiagnosis as a "normal" access violation; 2322 // This is safe to do because we have a new/unique ExceptionInformation 2323 // code for this condition. 2324 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2325 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2326 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2327 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2328 2329 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2330 int page_size = os::vm_page_size(); 2331 2332 // Make sure the pc and the faulting address are sane. 2333 // 2334 // If an instruction spans a page boundary, and the page containing 2335 // the beginning of the instruction is executable but the following 2336 // page is not, the pc and the faulting address might be slightly 2337 // different - we still want to unguard the 2nd page in this case. 2338 // 2339 // 15 bytes seems to be a (very) safe value for max instruction size. 2340 bool pc_is_near_addr = 2341 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2342 bool instr_spans_page_boundary = 2343 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2344 (intptr_t) page_size) > 0); 2345 2346 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2347 static volatile address last_addr = 2348 (address) os::non_memory_address_word(); 2349 2350 // In conservative mode, don't unguard unless the address is in the VM 2351 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2352 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2353 2354 // Set memory to RWX and retry 2355 address page_start = 2356 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2357 bool res = os::protect_memory((char*) page_start, page_size, 2358 os::MEM_PROT_RWX); 2359 2360 if (PrintMiscellaneous && Verbose) { 2361 char buf[256]; 2362 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 2363 "at " INTPTR_FORMAT 2364 ", unguarding " INTPTR_FORMAT ": %s", addr, 2365 page_start, (res ? "success" : strerror(errno))); 2366 tty->print_raw_cr(buf); 2367 } 2368 2369 // Set last_addr so if we fault again at the same address, we don't 2370 // end up in an endless loop. 2371 // 2372 // There are two potential complications here. Two threads trapping 2373 // at the same address at the same time could cause one of the 2374 // threads to think it already unguarded, and abort the VM. Likely 2375 // very rare. 2376 // 2377 // The other race involves two threads alternately trapping at 2378 // different addresses and failing to unguard the page, resulting in 2379 // an endless loop. This condition is probably even more unlikely 2380 // than the first. 2381 // 2382 // Although both cases could be avoided by using locks or thread 2383 // local last_addr, these solutions are unnecessary complication: 2384 // this handler is a best-effort safety net, not a complete solution. 2385 // It is disabled by default and should only be used as a workaround 2386 // in case we missed any no-execute-unsafe VM code. 2387 2388 last_addr = addr; 2389 2390 return EXCEPTION_CONTINUE_EXECUTION; 2391 } 2392 } 2393 2394 // Last unguard failed or not unguarding 2395 tty->print_raw_cr("Execution protection violation"); 2396 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2397 exceptionInfo->ContextRecord); 2398 return EXCEPTION_CONTINUE_SEARCH; 2399 } 2400 } 2401 #endif // _WIN64 2402 2403 // Check to see if we caught the safepoint code in the 2404 // process of write protecting the memory serialization page. 2405 // It write enables the page immediately after protecting it 2406 // so just return. 2407 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2408 JavaThread* thread = (JavaThread*) t; 2409 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2410 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2411 if (os::is_memory_serialize_page(thread, addr)) { 2412 // Block current thread until the memory serialize page permission restored. 2413 os::block_on_serialize_page_trap(); 2414 return EXCEPTION_CONTINUE_EXECUTION; 2415 } 2416 } 2417 2418 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) && 2419 VM_Version::is_cpuinfo_segv_addr(pc)) { 2420 // Verify that OS save/restore AVX registers. 2421 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr()); 2422 } 2423 2424 if (t != NULL && t->is_Java_thread()) { 2425 JavaThread* thread = (JavaThread*) t; 2426 bool in_java = thread->thread_state() == _thread_in_Java; 2427 2428 // Handle potential stack overflows up front. 2429 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2430 if (os::uses_stack_guard_pages()) { 2431 #ifdef _M_IA64 2432 // Use guard page for register stack. 2433 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2434 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2435 // Check for a register stack overflow on Itanium 2436 if (thread->addr_inside_register_stack_red_zone(addr)) { 2437 // Fatal red zone violation happens if the Java program 2438 // catches a StackOverflow error and does so much processing 2439 // that it runs beyond the unprotected yellow guard zone. As 2440 // a result, we are out of here. 2441 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit."); 2442 } else if(thread->addr_inside_register_stack(addr)) { 2443 // Disable the yellow zone which sets the state that 2444 // we've got a stack overflow problem. 2445 if (thread->stack_yellow_zone_enabled()) { 2446 thread->disable_stack_yellow_zone(); 2447 } 2448 // Give us some room to process the exception. 2449 thread->disable_register_stack_guard(); 2450 // Tracing with +Verbose. 2451 if (Verbose) { 2452 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc); 2453 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr); 2454 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base()); 2455 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]", 2456 thread->register_stack_base(), 2457 thread->register_stack_base() + thread->stack_size()); 2458 } 2459 2460 // Reguard the permanent register stack red zone just to be sure. 2461 // We saw Windows silently disabling this without telling us. 2462 thread->enable_register_stack_red_zone(); 2463 2464 return Handle_Exception(exceptionInfo, 2465 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2466 } 2467 #endif 2468 if (thread->stack_yellow_zone_enabled()) { 2469 // Yellow zone violation. The o/s has unprotected the first yellow 2470 // zone page for us. Note: must call disable_stack_yellow_zone to 2471 // update the enabled status, even if the zone contains only one page. 2472 thread->disable_stack_yellow_zone(); 2473 // If not in java code, return and hope for the best. 2474 return in_java 2475 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2476 : EXCEPTION_CONTINUE_EXECUTION; 2477 } else { 2478 // Fatal red zone violation. 2479 thread->disable_stack_red_zone(); 2480 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2481 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2482 exceptionInfo->ContextRecord); 2483 return EXCEPTION_CONTINUE_SEARCH; 2484 } 2485 } else if (in_java) { 2486 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2487 // a one-time-only guard page, which it has released to us. The next 2488 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2489 return Handle_Exception(exceptionInfo, 2490 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2491 } else { 2492 // Can only return and hope for the best. Further stack growth will 2493 // result in an ACCESS_VIOLATION. 2494 return EXCEPTION_CONTINUE_EXECUTION; 2495 } 2496 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2497 // Either stack overflow or null pointer exception. 2498 if (in_java) { 2499 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2500 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2501 address stack_end = thread->stack_base() - thread->stack_size(); 2502 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2503 // Stack overflow. 2504 assert(!os::uses_stack_guard_pages(), 2505 "should be caught by red zone code above."); 2506 return Handle_Exception(exceptionInfo, 2507 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2508 } 2509 // Check for safepoint polling and implicit null 2510 // We only expect null pointers in the stubs (vtable) 2511 // the rest are checked explicitly now. 2512 CodeBlob* cb = CodeCache::find_blob(pc); 2513 if (cb != NULL) { 2514 if (os::is_poll_address(addr)) { 2515 address stub = SharedRuntime::get_poll_stub(pc); 2516 return Handle_Exception(exceptionInfo, stub); 2517 } 2518 } 2519 { 2520 #ifdef _WIN64 2521 // If it's a legal stack address map the entire region in 2522 // 2523 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2524 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2525 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) { 2526 addr = (address)((uintptr_t)addr & 2527 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2528 os::commit_memory((char *)addr, thread->stack_base() - addr, 2529 !ExecMem); 2530 return EXCEPTION_CONTINUE_EXECUTION; 2531 } else 2532 #endif 2533 { 2534 // Null pointer exception. 2535 #ifdef _M_IA64 2536 // Process implicit null checks in compiled code. Note: Implicit null checks 2537 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs. 2538 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) { 2539 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format); 2540 // Handle implicit null check in UEP method entry 2541 if (cb && (cb->is_frame_complete_at(pc) || 2542 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) { 2543 if (Verbose) { 2544 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0); 2545 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format); 2546 tty->print_cr(" to addr " INTPTR_FORMAT, addr); 2547 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)", 2548 *(bundle_start + 1), *bundle_start); 2549 } 2550 return Handle_Exception(exceptionInfo, 2551 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL)); 2552 } 2553 } 2554 2555 // Implicit null checks were processed above. Hence, we should not reach 2556 // here in the usual case => die! 2557 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception"); 2558 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2559 exceptionInfo->ContextRecord); 2560 return EXCEPTION_CONTINUE_SEARCH; 2561 2562 #else // !IA64 2563 2564 // Windows 98 reports faulting addresses incorrectly 2565 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2566 !os::win32::is_nt()) { 2567 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2568 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2569 } 2570 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2571 exceptionInfo->ContextRecord); 2572 return EXCEPTION_CONTINUE_SEARCH; 2573 #endif 2574 } 2575 } 2576 } 2577 2578 #ifdef _WIN64 2579 // Special care for fast JNI field accessors. 2580 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2581 // in and the heap gets shrunk before the field access. 2582 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2583 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2584 if (addr != (address)-1) { 2585 return Handle_Exception(exceptionInfo, addr); 2586 } 2587 } 2588 #endif 2589 2590 // Stack overflow or null pointer exception in native code. 2591 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2592 exceptionInfo->ContextRecord); 2593 return EXCEPTION_CONTINUE_SEARCH; 2594 } // /EXCEPTION_ACCESS_VIOLATION 2595 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2596 #if defined _M_IA64 2597 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION || 2598 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) { 2599 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0); 2600 2601 // Compiled method patched to be non entrant? Following conditions must apply: 2602 // 1. must be first instruction in bundle 2603 // 2. must be a break instruction with appropriate code 2604 if ((((uint64_t) pc & 0x0F) == 0) && 2605 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) { 2606 return Handle_Exception(exceptionInfo, 2607 (address)SharedRuntime::get_handle_wrong_method_stub()); 2608 } 2609 } // /EXCEPTION_ILLEGAL_INSTRUCTION 2610 #endif 2611 2612 2613 if (in_java) { 2614 switch (exception_code) { 2615 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2616 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2617 2618 case EXCEPTION_INT_OVERFLOW: 2619 return Handle_IDiv_Exception(exceptionInfo); 2620 2621 } // switch 2622 } 2623 if (((thread->thread_state() == _thread_in_Java) || 2624 (thread->thread_state() == _thread_in_native)) && 2625 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) { 2626 LONG result=Handle_FLT_Exception(exceptionInfo); 2627 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2628 } 2629 } 2630 2631 if (exception_code != EXCEPTION_BREAKPOINT) { 2632 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2633 exceptionInfo->ContextRecord); 2634 } 2635 return EXCEPTION_CONTINUE_SEARCH; 2636 } 2637 2638 #ifndef _WIN64 2639 // Special care for fast JNI accessors. 2640 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2641 // the heap gets shrunk before the field access. 2642 // Need to install our own structured exception handler since native code may 2643 // install its own. 2644 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2645 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2646 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2647 address pc = (address) exceptionInfo->ContextRecord->Eip; 2648 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2649 if (addr != (address)-1) { 2650 return Handle_Exception(exceptionInfo, addr); 2651 } 2652 } 2653 return EXCEPTION_CONTINUE_SEARCH; 2654 } 2655 2656 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \ 2657 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \ 2658 jobject obj, \ 2659 jfieldID fieldID) { \ 2660 __try { \ 2661 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \ 2662 obj, \ 2663 fieldID); \ 2664 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \ 2665 _exception_info())) { \ 2666 } \ 2667 return 0; \ 2668 } 2669 2670 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2671 DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2672 DEFINE_FAST_GETFIELD(jchar, char, Char) 2673 DEFINE_FAST_GETFIELD(jshort, short, Short) 2674 DEFINE_FAST_GETFIELD(jint, int, Int) 2675 DEFINE_FAST_GETFIELD(jlong, long, Long) 2676 DEFINE_FAST_GETFIELD(jfloat, float, Float) 2677 DEFINE_FAST_GETFIELD(jdouble, double, Double) 2678 2679 address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2680 switch (type) { 2681 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2682 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2683 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2684 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2685 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2686 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2687 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2688 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2689 default: ShouldNotReachHere(); 2690 } 2691 return (address)-1; 2692 } 2693 #endif 2694 2695 // Virtual Memory 2696 2697 int os::vm_page_size() { return os::win32::vm_page_size(); } 2698 int os::vm_allocation_granularity() { 2699 return os::win32::vm_allocation_granularity(); 2700 } 2701 2702 // Windows large page support is available on Windows 2003. In order to use 2703 // large page memory, the administrator must first assign additional privilege 2704 // to the user: 2705 // + select Control Panel -> Administrative Tools -> Local Security Policy 2706 // + select Local Policies -> User Rights Assignment 2707 // + double click "Lock pages in memory", add users and/or groups 2708 // + reboot 2709 // Note the above steps are needed for administrator as well, as administrators 2710 // by default do not have the privilege to lock pages in memory. 2711 // 2712 // Note about Windows 2003: although the API supports committing large page 2713 // memory on a page-by-page basis and VirtualAlloc() returns success under this 2714 // scenario, I found through experiment it only uses large page if the entire 2715 // memory region is reserved and committed in a single VirtualAlloc() call. 2716 // This makes Windows large page support more or less like Solaris ISM, in 2717 // that the entire heap must be committed upfront. This probably will change 2718 // in the future, if so the code below needs to be revisited. 2719 2720 #ifndef MEM_LARGE_PAGES 2721 #define MEM_LARGE_PAGES 0x20000000 2722 #endif 2723 2724 static HANDLE _hProcess; 2725 static HANDLE _hToken; 2726 2727 // Container for NUMA node list info 2728 class NUMANodeListHolder { 2729 private: 2730 int *_numa_used_node_list; // allocated below 2731 int _numa_used_node_count; 2732 2733 void free_node_list() { 2734 if (_numa_used_node_list != NULL) { 2735 FREE_C_HEAP_ARRAY(int, _numa_used_node_list); 2736 } 2737 } 2738 2739 public: 2740 NUMANodeListHolder() { 2741 _numa_used_node_count = 0; 2742 _numa_used_node_list = NULL; 2743 // do rest of initialization in build routine (after function pointers are set up) 2744 } 2745 2746 ~NUMANodeListHolder() { 2747 free_node_list(); 2748 } 2749 2750 bool build() { 2751 DWORD_PTR proc_aff_mask; 2752 DWORD_PTR sys_aff_mask; 2753 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false; 2754 ULONG highest_node_number; 2755 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false; 2756 free_node_list(); 2757 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal); 2758 for (unsigned int i = 0; i <= highest_node_number; i++) { 2759 ULONGLONG proc_mask_numa_node; 2760 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false; 2761 if ((proc_aff_mask & proc_mask_numa_node)!=0) { 2762 _numa_used_node_list[_numa_used_node_count++] = i; 2763 } 2764 } 2765 return (_numa_used_node_count > 1); 2766 } 2767 2768 int get_count() { return _numa_used_node_count; } 2769 int get_node_list_entry(int n) { 2770 // for indexes out of range, returns -1 2771 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1); 2772 } 2773 2774 } numa_node_list_holder; 2775 2776 2777 2778 static size_t _large_page_size = 0; 2779 2780 static bool resolve_functions_for_large_page_init() { 2781 return os::Kernel32Dll::GetLargePageMinimumAvailable() && 2782 os::Advapi32Dll::AdvapiAvailable(); 2783 } 2784 2785 static bool request_lock_memory_privilege() { 2786 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2787 os::current_process_id()); 2788 2789 LUID luid; 2790 if (_hProcess != NULL && 2791 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2792 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2793 2794 TOKEN_PRIVILEGES tp; 2795 tp.PrivilegeCount = 1; 2796 tp.Privileges[0].Luid = luid; 2797 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2798 2799 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2800 // privilege. Check GetLastError() too. See MSDN document. 2801 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2802 (GetLastError() == ERROR_SUCCESS)) { 2803 return true; 2804 } 2805 } 2806 2807 return false; 2808 } 2809 2810 static void cleanup_after_large_page_init() { 2811 if (_hProcess) CloseHandle(_hProcess); 2812 _hProcess = NULL; 2813 if (_hToken) CloseHandle(_hToken); 2814 _hToken = NULL; 2815 } 2816 2817 static bool numa_interleaving_init() { 2818 bool success = false; 2819 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving); 2820 2821 // print a warning if UseNUMAInterleaving flag is specified on command line 2822 bool warn_on_failure = use_numa_interleaving_specified; 2823 #define WARN(msg) if (warn_on_failure) { warning(msg); } 2824 2825 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages) 2826 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2827 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity); 2828 2829 if (os::Kernel32Dll::NumaCallsAvailable()) { 2830 if (numa_node_list_holder.build()) { 2831 if (PrintMiscellaneous && Verbose) { 2832 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count()); 2833 for (int i = 0; i < numa_node_list_holder.get_count(); i++) { 2834 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i)); 2835 } 2836 tty->print("\n"); 2837 } 2838 success = true; 2839 } else { 2840 WARN("Process does not cover multiple NUMA nodes."); 2841 } 2842 } else { 2843 WARN("NUMA Interleaving is not supported by the operating system."); 2844 } 2845 if (!success) { 2846 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag."); 2847 } 2848 return success; 2849 #undef WARN 2850 } 2851 2852 // this routine is used whenever we need to reserve a contiguous VA range 2853 // but we need to make separate VirtualAlloc calls for each piece of the range 2854 // Reasons for doing this: 2855 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise) 2856 // * UseNUMAInterleaving requires a separate node for each piece 2857 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, 2858 DWORD prot, 2859 bool should_inject_error = false) { 2860 char * p_buf; 2861 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size 2862 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2863 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size; 2864 2865 // first reserve enough address space in advance since we want to be 2866 // able to break a single contiguous virtual address range into multiple 2867 // large page commits but WS2003 does not allow reserving large page space 2868 // so we just use 4K pages for reserve, this gives us a legal contiguous 2869 // address space. then we will deallocate that reservation, and re alloc 2870 // using large pages 2871 const size_t size_of_reserve = bytes + chunk_size; 2872 if (bytes > size_of_reserve) { 2873 // Overflowed. 2874 return NULL; 2875 } 2876 p_buf = (char *) VirtualAlloc(addr, 2877 size_of_reserve, // size of Reserve 2878 MEM_RESERVE, 2879 PAGE_READWRITE); 2880 // If reservation failed, return NULL 2881 if (p_buf == NULL) return NULL; 2882 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC); 2883 os::release_memory(p_buf, bytes + chunk_size); 2884 2885 // we still need to round up to a page boundary (in case we are using large pages) 2886 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size) 2887 // instead we handle this in the bytes_to_rq computation below 2888 p_buf = (char *) align_size_up((size_t)p_buf, page_size); 2889 2890 // now go through and allocate one chunk at a time until all bytes are 2891 // allocated 2892 size_t bytes_remaining = bytes; 2893 // An overflow of align_size_up() would have been caught above 2894 // in the calculation of size_of_reserve. 2895 char * next_alloc_addr = p_buf; 2896 HANDLE hProc = GetCurrentProcess(); 2897 2898 #ifdef ASSERT 2899 // Variable for the failure injection 2900 long ran_num = os::random(); 2901 size_t fail_after = ran_num % bytes; 2902 #endif 2903 2904 int count=0; 2905 while (bytes_remaining) { 2906 // select bytes_to_rq to get to the next chunk_size boundary 2907 2908 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size)); 2909 // Note allocate and commit 2910 char * p_new; 2911 2912 #ifdef ASSERT 2913 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after); 2914 #else 2915 const bool inject_error_now = false; 2916 #endif 2917 2918 if (inject_error_now) { 2919 p_new = NULL; 2920 } else { 2921 if (!UseNUMAInterleaving) { 2922 p_new = (char *) VirtualAlloc(next_alloc_addr, 2923 bytes_to_rq, 2924 flags, 2925 prot); 2926 } else { 2927 // get the next node to use from the used_node_list 2928 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected"); 2929 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count()); 2930 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc, 2931 next_alloc_addr, 2932 bytes_to_rq, 2933 flags, 2934 prot, 2935 node); 2936 } 2937 } 2938 2939 if (p_new == NULL) { 2940 // Free any allocated pages 2941 if (next_alloc_addr > p_buf) { 2942 // Some memory was committed so release it. 2943 size_t bytes_to_release = bytes - bytes_remaining; 2944 // NMT has yet to record any individual blocks, so it 2945 // need to create a dummy 'reserve' record to match 2946 // the release. 2947 MemTracker::record_virtual_memory_reserve((address)p_buf, 2948 bytes_to_release, CALLER_PC); 2949 os::release_memory(p_buf, bytes_to_release); 2950 } 2951 #ifdef ASSERT 2952 if (should_inject_error) { 2953 if (TracePageSizes && Verbose) { 2954 tty->print_cr("Reserving pages individually failed."); 2955 } 2956 } 2957 #endif 2958 return NULL; 2959 } 2960 2961 bytes_remaining -= bytes_to_rq; 2962 next_alloc_addr += bytes_to_rq; 2963 count++; 2964 } 2965 // Although the memory is allocated individually, it is returned as one. 2966 // NMT records it as one block. 2967 if ((flags & MEM_COMMIT) != 0) { 2968 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC); 2969 } else { 2970 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC); 2971 } 2972 2973 // made it this far, success 2974 return p_buf; 2975 } 2976 2977 2978 2979 void os::large_page_init() { 2980 if (!UseLargePages) return; 2981 2982 // print a warning if any large page related flag is specified on command line 2983 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2984 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2985 bool success = false; 2986 2987 #define WARN(msg) if (warn_on_failure) { warning(msg); } 2988 if (resolve_functions_for_large_page_init()) { 2989 if (request_lock_memory_privilege()) { 2990 size_t s = os::Kernel32Dll::GetLargePageMinimum(); 2991 if (s) { 2992 #if defined(IA32) || defined(AMD64) 2993 if (s > 4*M || LargePageSizeInBytes > 4*M) { 2994 WARN("JVM cannot use large pages bigger than 4mb."); 2995 } else { 2996 #endif 2997 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 2998 _large_page_size = LargePageSizeInBytes; 2999 } else { 3000 _large_page_size = s; 3001 } 3002 success = true; 3003 #if defined(IA32) || defined(AMD64) 3004 } 3005 #endif 3006 } else { 3007 WARN("Large page is not supported by the processor."); 3008 } 3009 } else { 3010 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 3011 } 3012 } else { 3013 WARN("Large page is not supported by the operating system."); 3014 } 3015 #undef WARN 3016 3017 const size_t default_page_size = (size_t) vm_page_size(); 3018 if (success && _large_page_size > default_page_size) { 3019 _page_sizes[0] = _large_page_size; 3020 _page_sizes[1] = default_page_size; 3021 _page_sizes[2] = 0; 3022 } 3023 3024 cleanup_after_large_page_init(); 3025 UseLargePages = success; 3026 } 3027 3028 // On win32, one cannot release just a part of reserved memory, it's an 3029 // all or nothing deal. When we split a reservation, we must break the 3030 // reservation into two reservations. 3031 void os::pd_split_reserved_memory(char *base, size_t size, size_t split, 3032 bool realloc) { 3033 if (size > 0) { 3034 release_memory(base, size); 3035 if (realloc) { 3036 reserve_memory(split, base); 3037 } 3038 if (size != split) { 3039 reserve_memory(size - split, base + split); 3040 } 3041 } 3042 } 3043 3044 // Multiple threads can race in this code but it's not possible to unmap small sections of 3045 // virtual space to get requested alignment, like posix-like os's. 3046 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe. 3047 char* os::reserve_memory_aligned(size_t size, size_t alignment) { 3048 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 3049 "Alignment must be a multiple of allocation granularity (page size)"); 3050 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 3051 3052 size_t extra_size = size + alignment; 3053 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 3054 3055 char* aligned_base = NULL; 3056 3057 do { 3058 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 3059 if (extra_base == NULL) { 3060 return NULL; 3061 } 3062 // Do manual alignment 3063 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 3064 3065 os::release_memory(extra_base, extra_size); 3066 3067 aligned_base = os::reserve_memory(size, aligned_base); 3068 3069 } while (aligned_base == NULL); 3070 3071 return aligned_base; 3072 } 3073 3074 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 3075 assert((size_t)addr % os::vm_allocation_granularity() == 0, 3076 "reserve alignment"); 3077 assert(bytes % os::vm_page_size() == 0, "reserve page size"); 3078 char* res; 3079 // note that if UseLargePages is on, all the areas that require interleaving 3080 // will go thru reserve_memory_special rather than thru here. 3081 bool use_individual = (UseNUMAInterleaving && !UseLargePages); 3082 if (!use_individual) { 3083 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 3084 } else { 3085 elapsedTimer reserveTimer; 3086 if (Verbose && PrintMiscellaneous) reserveTimer.start(); 3087 // in numa interleaving, we have to allocate pages individually 3088 // (well really chunks of NUMAInterleaveGranularity size) 3089 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE); 3090 if (res == NULL) { 3091 warning("NUMA page allocation failed"); 3092 } 3093 if (Verbose && PrintMiscellaneous) { 3094 reserveTimer.stop(); 3095 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes, 3096 reserveTimer.milliseconds(), reserveTimer.ticks()); 3097 } 3098 } 3099 assert(res == NULL || addr == NULL || addr == res, 3100 "Unexpected address from reserve."); 3101 3102 return res; 3103 } 3104 3105 // Reserve memory at an arbitrary address, only if that area is 3106 // available (and not reserved for something else). 3107 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3108 // Windows os::reserve_memory() fails of the requested address range is 3109 // not avilable. 3110 return reserve_memory(bytes, requested_addr); 3111 } 3112 3113 size_t os::large_page_size() { 3114 return _large_page_size; 3115 } 3116 3117 bool os::can_commit_large_page_memory() { 3118 // Windows only uses large page memory when the entire region is reserved 3119 // and committed in a single VirtualAlloc() call. This may change in the 3120 // future, but with Windows 2003 it's not possible to commit on demand. 3121 return false; 3122 } 3123 3124 bool os::can_execute_large_page_memory() { 3125 return true; 3126 } 3127 3128 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, 3129 bool exec) { 3130 assert(UseLargePages, "only for large pages"); 3131 3132 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { 3133 return NULL; // Fallback to small pages. 3134 } 3135 3136 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 3137 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3138 3139 // with large pages, there are two cases where we need to use Individual Allocation 3140 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003) 3141 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page 3142 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) { 3143 if (TracePageSizes && Verbose) { 3144 tty->print_cr("Reserving large pages individually."); 3145 } 3146 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError); 3147 if (p_buf == NULL) { 3148 // give an appropriate warning message 3149 if (UseNUMAInterleaving) { 3150 warning("NUMA large page allocation failed, UseLargePages flag ignored"); 3151 } 3152 if (UseLargePagesIndividualAllocation) { 3153 warning("Individually allocated large pages failed, " 3154 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 3155 } 3156 return NULL; 3157 } 3158 3159 return p_buf; 3160 3161 } else { 3162 if (TracePageSizes && Verbose) { 3163 tty->print_cr("Reserving large pages in a single large chunk."); 3164 } 3165 // normal policy just allocate it all at once 3166 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3167 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); 3168 if (res != NULL) { 3169 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC); 3170 } 3171 3172 return res; 3173 } 3174 } 3175 3176 bool os::release_memory_special(char* base, size_t bytes) { 3177 assert(base != NULL, "Sanity check"); 3178 return release_memory(base, bytes); 3179 } 3180 3181 void os::print_statistics() { 3182 } 3183 3184 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) { 3185 int err = os::get_last_error(); 3186 char buf[256]; 3187 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3188 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 3189 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3190 exec, buf_len != 0 ? buf : "<no_error_string>", err); 3191 } 3192 3193 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 3194 if (bytes == 0) { 3195 // Don't bother the OS with noops. 3196 return true; 3197 } 3198 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 3199 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 3200 // Don't attempt to print anything if the OS call fails. We're 3201 // probably low on resources, so the print itself may cause crashes. 3202 3203 // unless we have NUMAInterleaving enabled, the range of a commit 3204 // is always within a reserve covered by a single VirtualAlloc 3205 // in that case we can just do a single commit for the requested size 3206 if (!UseNUMAInterleaving) { 3207 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) { 3208 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3209 return false; 3210 } 3211 if (exec) { 3212 DWORD oldprot; 3213 // Windows doc says to use VirtualProtect to get execute permissions 3214 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) { 3215 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3216 return false; 3217 } 3218 } 3219 return true; 3220 } else { 3221 3222 // when NUMAInterleaving is enabled, the commit might cover a range that 3223 // came from multiple VirtualAlloc reserves (using allocate_pages_individually). 3224 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery 3225 // returns represents the number of bytes that can be committed in one step. 3226 size_t bytes_remaining = bytes; 3227 char * next_alloc_addr = addr; 3228 while (bytes_remaining > 0) { 3229 MEMORY_BASIC_INFORMATION alloc_info; 3230 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info)); 3231 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3232 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, 3233 PAGE_READWRITE) == NULL) { 3234 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3235 exec);) 3236 return false; 3237 } 3238 if (exec) { 3239 DWORD oldprot; 3240 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, 3241 PAGE_EXECUTE_READWRITE, &oldprot)) { 3242 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3243 exec);) 3244 return false; 3245 } 3246 } 3247 bytes_remaining -= bytes_to_rq; 3248 next_alloc_addr += bytes_to_rq; 3249 } 3250 } 3251 // if we made it this far, return true 3252 return true; 3253 } 3254 3255 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 3256 bool exec) { 3257 // alignment_hint is ignored on this OS 3258 return pd_commit_memory(addr, size, exec); 3259 } 3260 3261 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 3262 const char* mesg) { 3263 assert(mesg != NULL, "mesg must be specified"); 3264 if (!pd_commit_memory(addr, size, exec)) { 3265 warn_fail_commit_memory(addr, size, exec); 3266 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); 3267 } 3268 } 3269 3270 void os::pd_commit_memory_or_exit(char* addr, size_t size, 3271 size_t alignment_hint, bool exec, 3272 const char* mesg) { 3273 // alignment_hint is ignored on this OS 3274 pd_commit_memory_or_exit(addr, size, exec, mesg); 3275 } 3276 3277 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3278 if (bytes == 0) { 3279 // Don't bother the OS with noops. 3280 return true; 3281 } 3282 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 3283 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 3284 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0); 3285 } 3286 3287 bool os::pd_release_memory(char* addr, size_t bytes) { 3288 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 3289 } 3290 3291 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 3292 return os::commit_memory(addr, size, !ExecMem); 3293 } 3294 3295 bool os::remove_stack_guard_pages(char* addr, size_t size) { 3296 return os::uncommit_memory(addr, size); 3297 } 3298 3299 // Set protections specified 3300 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3301 bool is_committed) { 3302 unsigned int p = 0; 3303 switch (prot) { 3304 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 3305 case MEM_PROT_READ: p = PAGE_READONLY; break; 3306 case MEM_PROT_RW: p = PAGE_READWRITE; break; 3307 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 3308 default: 3309 ShouldNotReachHere(); 3310 } 3311 3312 DWORD old_status; 3313 3314 // Strange enough, but on Win32 one can change protection only for committed 3315 // memory, not a big deal anyway, as bytes less or equal than 64K 3316 if (!is_committed) { 3317 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX, 3318 "cannot commit protection page"); 3319 } 3320 // One cannot use os::guard_memory() here, as on Win32 guard page 3321 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 3322 // 3323 // Pages in the region become guard pages. Any attempt to access a guard page 3324 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 3325 // the guard page status. Guard pages thus act as a one-time access alarm. 3326 return VirtualProtect(addr, bytes, p, &old_status) != 0; 3327 } 3328 3329 bool os::guard_memory(char* addr, size_t bytes) { 3330 DWORD old_status; 3331 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 3332 } 3333 3334 bool os::unguard_memory(char* addr, size_t bytes) { 3335 DWORD old_status; 3336 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 3337 } 3338 3339 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3340 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3341 void os::numa_make_global(char *addr, size_t bytes) { } 3342 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 3343 bool os::numa_topology_changed() { return false; } 3344 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); } 3345 int os::numa_get_group_id() { return 0; } 3346 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 3347 if (numa_node_list_holder.get_count() == 0 && size > 0) { 3348 // Provide an answer for UMA systems 3349 ids[0] = 0; 3350 return 1; 3351 } else { 3352 // check for size bigger than actual groups_num 3353 size = MIN2(size, numa_get_groups_num()); 3354 for (int i = 0; i < (int)size; i++) { 3355 ids[i] = numa_node_list_holder.get_node_list_entry(i); 3356 } 3357 return size; 3358 } 3359 } 3360 3361 bool os::get_page_info(char *start, page_info* info) { 3362 return false; 3363 } 3364 3365 char *os::scan_pages(char *start, char* end, page_info* page_expected, 3366 page_info* page_found) { 3367 return end; 3368 } 3369 3370 char* os::non_memory_address_word() { 3371 // Must never look like an address returned by reserve_memory, 3372 // even in its subfields (as defined by the CPU immediate fields, 3373 // if the CPU splits constants across multiple instructions). 3374 return (char*)-1; 3375 } 3376 3377 #define MAX_ERROR_COUNT 100 3378 #define SYS_THREAD_ERROR 0xffffffffUL 3379 3380 void os::pd_start_thread(Thread* thread) { 3381 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 3382 // Returns previous suspend state: 3383 // 0: Thread was not suspended 3384 // 1: Thread is running now 3385 // >1: Thread is still suspended. 3386 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3387 } 3388 3389 class HighResolutionInterval : public CHeapObj<mtThread> { 3390 // The default timer resolution seems to be 10 milliseconds. 3391 // (Where is this written down?) 3392 // If someone wants to sleep for only a fraction of the default, 3393 // then we set the timer resolution down to 1 millisecond for 3394 // the duration of their interval. 3395 // We carefully set the resolution back, since otherwise we 3396 // seem to incur an overhead (3%?) that we don't need. 3397 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 3398 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 3399 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 3400 // timeBeginPeriod() if the relative error exceeded some threshold. 3401 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 3402 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 3403 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 3404 // resolution timers running. 3405 private: 3406 jlong resolution; 3407 public: 3408 HighResolutionInterval(jlong ms) { 3409 resolution = ms % 10L; 3410 if (resolution != 0) { 3411 MMRESULT result = timeBeginPeriod(1L); 3412 } 3413 } 3414 ~HighResolutionInterval() { 3415 if (resolution != 0) { 3416 MMRESULT result = timeEndPeriod(1L); 3417 } 3418 resolution = 0L; 3419 } 3420 }; 3421 3422 int os::sleep(Thread* thread, jlong ms, bool interruptable) { 3423 jlong limit = (jlong) MAXDWORD; 3424 3425 while (ms > limit) { 3426 int res; 3427 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) { 3428 return res; 3429 } 3430 ms -= limit; 3431 } 3432 3433 assert(thread == Thread::current(), "thread consistency check"); 3434 OSThread* osthread = thread->osthread(); 3435 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 3436 int result; 3437 if (interruptable) { 3438 assert(thread->is_Java_thread(), "must be java thread"); 3439 JavaThread *jt = (JavaThread *) thread; 3440 ThreadBlockInVM tbivm(jt); 3441 3442 jt->set_suspend_equivalent(); 3443 // cleared by handle_special_suspend_equivalent_condition() or 3444 // java_suspend_self() via check_and_wait_while_suspended() 3445 3446 HANDLE events[1]; 3447 events[0] = osthread->interrupt_event(); 3448 HighResolutionInterval *phri=NULL; 3449 if (!ForceTimeHighResolution) { 3450 phri = new HighResolutionInterval(ms); 3451 } 3452 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 3453 result = OS_TIMEOUT; 3454 } else { 3455 ResetEvent(osthread->interrupt_event()); 3456 osthread->set_interrupted(false); 3457 result = OS_INTRPT; 3458 } 3459 delete phri; //if it is NULL, harmless 3460 3461 // were we externally suspended while we were waiting? 3462 jt->check_and_wait_while_suspended(); 3463 } else { 3464 assert(!thread->is_Java_thread(), "must not be java thread"); 3465 Sleep((long) ms); 3466 result = OS_TIMEOUT; 3467 } 3468 return result; 3469 } 3470 3471 // Short sleep, direct OS call. 3472 // 3473 // ms = 0, means allow others (if any) to run. 3474 // 3475 void os::naked_short_sleep(jlong ms) { 3476 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3477 Sleep(ms); 3478 } 3479 3480 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3481 void os::infinite_sleep() { 3482 while (true) { // sleep forever ... 3483 Sleep(100000); // ... 100 seconds at a time 3484 } 3485 } 3486 3487 typedef BOOL (WINAPI * STTSignature)(void); 3488 3489 void os::naked_yield() { 3490 // Use either SwitchToThread() or Sleep(0) 3491 // Consider passing back the return value from SwitchToThread(). 3492 if (os::Kernel32Dll::SwitchToThreadAvailable()) { 3493 SwitchToThread(); 3494 } else { 3495 Sleep(0); 3496 } 3497 } 3498 3499 // Win32 only gives you access to seven real priorities at a time, 3500 // so we compress Java's ten down to seven. It would be better 3501 // if we dynamically adjusted relative priorities. 3502 3503 int os::java_to_os_priority[CriticalPriority + 1] = { 3504 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3505 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3506 THREAD_PRIORITY_LOWEST, // 2 3507 THREAD_PRIORITY_BELOW_NORMAL, // 3 3508 THREAD_PRIORITY_BELOW_NORMAL, // 4 3509 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3510 THREAD_PRIORITY_NORMAL, // 6 3511 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3512 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3513 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3514 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority 3515 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority 3516 }; 3517 3518 int prio_policy1[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_ABOVE_NORMAL, // 6 3526 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3527 THREAD_PRIORITY_HIGHEST, // 8 3528 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3529 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority 3530 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority 3531 }; 3532 3533 static int prio_init() { 3534 // If ThreadPriorityPolicy is 1, switch tables 3535 if (ThreadPriorityPolicy == 1) { 3536 int i; 3537 for (i = 0; i < CriticalPriority + 1; i++) { 3538 os::java_to_os_priority[i] = prio_policy1[i]; 3539 } 3540 } 3541 if (UseCriticalJavaThreadPriority) { 3542 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 3543 } 3544 return 0; 3545 } 3546 3547 OSReturn os::set_native_priority(Thread* thread, int priority) { 3548 if (!UseThreadPriorities) return OS_OK; 3549 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3550 return ret ? OS_OK : OS_ERR; 3551 } 3552 3553 OSReturn os::get_native_priority(const Thread* const thread, 3554 int* priority_ptr) { 3555 if (!UseThreadPriorities) { 3556 *priority_ptr = java_to_os_priority[NormPriority]; 3557 return OS_OK; 3558 } 3559 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3560 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3561 assert(false, "GetThreadPriority failed"); 3562 return OS_ERR; 3563 } 3564 *priority_ptr = os_prio; 3565 return OS_OK; 3566 } 3567 3568 3569 // Hint to the underlying OS that a task switch would not be good. 3570 // Void return because it's a hint and can fail. 3571 void os::hint_no_preempt() {} 3572 3573 void os::interrupt(Thread* thread) { 3574 assert(!thread->is_Java_thread() || Thread::current() == thread || 3575 Threads_lock->owned_by_self(), 3576 "possibility of dangling Thread pointer"); 3577 3578 OSThread* osthread = thread->osthread(); 3579 osthread->set_interrupted(true); 3580 // More than one thread can get here with the same value of osthread, 3581 // resulting in multiple notifications. We do, however, want the store 3582 // to interrupted() to be visible to other threads before we post 3583 // the interrupt event. 3584 OrderAccess::release(); 3585 SetEvent(osthread->interrupt_event()); 3586 // For JSR166: unpark after setting status 3587 if (thread->is_Java_thread()) { 3588 ((JavaThread*)thread)->parker()->unpark(); 3589 } 3590 3591 ParkEvent * ev = thread->_ParkEvent; 3592 if (ev != NULL) ev->unpark(); 3593 } 3594 3595 3596 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3597 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3598 "possibility of dangling Thread pointer"); 3599 3600 OSThread* osthread = thread->osthread(); 3601 // There is no synchronization between the setting of the interrupt 3602 // and it being cleared here. It is critical - see 6535709 - that 3603 // we only clear the interrupt state, and reset the interrupt event, 3604 // if we are going to report that we were indeed interrupted - else 3605 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups 3606 // depending on the timing. By checking thread interrupt event to see 3607 // if the thread gets real interrupt thus prevent spurious wakeup. 3608 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0); 3609 if (interrupted && clear_interrupted) { 3610 osthread->set_interrupted(false); 3611 ResetEvent(osthread->interrupt_event()); 3612 } // Otherwise leave the interrupted state alone 3613 3614 return interrupted; 3615 } 3616 3617 // Get's a pc (hint) for a running thread. Currently used only for profiling. 3618 ExtendedPC os::get_thread_pc(Thread* thread) { 3619 CONTEXT context; 3620 context.ContextFlags = CONTEXT_CONTROL; 3621 HANDLE handle = thread->osthread()->thread_handle(); 3622 #ifdef _M_IA64 3623 assert(0, "Fix get_thread_pc"); 3624 return ExtendedPC(NULL); 3625 #else 3626 if (GetThreadContext(handle, &context)) { 3627 #ifdef _M_AMD64 3628 return ExtendedPC((address) context.Rip); 3629 #else 3630 return ExtendedPC((address) context.Eip); 3631 #endif 3632 } else { 3633 return ExtendedPC(NULL); 3634 } 3635 #endif 3636 } 3637 3638 // GetCurrentThreadId() returns DWORD 3639 intx os::current_thread_id() { return GetCurrentThreadId(); } 3640 3641 static int _initial_pid = 0; 3642 3643 int os::current_process_id() { 3644 return (_initial_pid ? _initial_pid : _getpid()); 3645 } 3646 3647 int os::win32::_vm_page_size = 0; 3648 int os::win32::_vm_allocation_granularity = 0; 3649 int os::win32::_processor_type = 0; 3650 // Processor level is not available on non-NT systems, use vm_version instead 3651 int os::win32::_processor_level = 0; 3652 julong os::win32::_physical_memory = 0; 3653 size_t os::win32::_default_stack_size = 0; 3654 3655 intx os::win32::_os_thread_limit = 0; 3656 volatile intx os::win32::_os_thread_count = 0; 3657 3658 bool os::win32::_is_nt = false; 3659 bool os::win32::_is_windows_2003 = false; 3660 bool os::win32::_is_windows_server = false; 3661 3662 // 6573254 3663 // Currently, the bug is observed across all the supported Windows releases, 3664 // including the latest one (as of this writing - Windows Server 2012 R2) 3665 bool os::win32::_has_exit_bug = true; 3666 bool os::win32::_has_performance_count = 0; 3667 3668 void os::win32::initialize_system_info() { 3669 SYSTEM_INFO si; 3670 GetSystemInfo(&si); 3671 _vm_page_size = si.dwPageSize; 3672 _vm_allocation_granularity = si.dwAllocationGranularity; 3673 _processor_type = si.dwProcessorType; 3674 _processor_level = si.wProcessorLevel; 3675 set_processor_count(si.dwNumberOfProcessors); 3676 3677 MEMORYSTATUSEX ms; 3678 ms.dwLength = sizeof(ms); 3679 3680 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3681 // dwMemoryLoad (% of memory in use) 3682 GlobalMemoryStatusEx(&ms); 3683 _physical_memory = ms.ullTotalPhys; 3684 3685 OSVERSIONINFOEX oi; 3686 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 3687 GetVersionEx((OSVERSIONINFO*)&oi); 3688 switch (oi.dwPlatformId) { 3689 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 3690 case VER_PLATFORM_WIN32_NT: 3691 _is_nt = true; 3692 { 3693 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3694 if (os_vers == 5002) { 3695 _is_windows_2003 = true; 3696 } 3697 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER || 3698 oi.wProductType == VER_NT_SERVER) { 3699 _is_windows_server = true; 3700 } 3701 } 3702 break; 3703 default: fatal("Unknown platform"); 3704 } 3705 3706 _default_stack_size = os::current_stack_size(); 3707 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3708 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3709 "stack size not a multiple of page size"); 3710 3711 initialize_performance_counter(); 3712 3713 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is 3714 // known to deadlock the system, if the VM issues to thread operations with 3715 // a too high frequency, e.g., such as changing the priorities. 3716 // The 6000 seems to work well - no deadlocks has been notices on the test 3717 // programs that we have seen experience this problem. 3718 if (!os::win32::is_nt()) { 3719 StarvationMonitorInterval = 6000; 3720 } 3721 } 3722 3723 3724 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, 3725 int ebuflen) { 3726 char path[MAX_PATH]; 3727 DWORD size; 3728 DWORD pathLen = (DWORD)sizeof(path); 3729 HINSTANCE result = NULL; 3730 3731 // only allow library name without path component 3732 assert(strchr(name, '\\') == NULL, "path not allowed"); 3733 assert(strchr(name, ':') == NULL, "path not allowed"); 3734 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) { 3735 jio_snprintf(ebuf, ebuflen, 3736 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name); 3737 return NULL; 3738 } 3739 3740 // search system directory 3741 if ((size = GetSystemDirectory(path, pathLen)) > 0) { 3742 if (size >= pathLen) { 3743 return NULL; // truncated 3744 } 3745 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3746 return NULL; // truncated 3747 } 3748 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3749 return result; 3750 } 3751 } 3752 3753 // try Windows directory 3754 if ((size = GetWindowsDirectory(path, pathLen)) > 0) { 3755 if (size >= pathLen) { 3756 return NULL; // truncated 3757 } 3758 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3759 return NULL; // truncated 3760 } 3761 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3762 return result; 3763 } 3764 } 3765 3766 jio_snprintf(ebuf, ebuflen, 3767 "os::win32::load_windows_dll() cannot load %s from system directories.", name); 3768 return NULL; 3769 } 3770 3771 #define EXIT_TIMEOUT 300000 /* 5 minutes */ 3772 3773 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) { 3774 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect); 3775 return TRUE; 3776 } 3777 3778 int os::win32::exit_process_or_thread(Ept what, int exit_code) { 3779 // Basic approach: 3780 // - Each exiting thread registers its intent to exit and then does so. 3781 // - A thread trying to terminate the process must wait for all 3782 // threads currently exiting to complete their exit. 3783 3784 if (os::win32::has_exit_bug()) { 3785 // The array holds handles of the threads that have started exiting by calling 3786 // _endthreadex(). 3787 // Should be large enough to avoid blocking the exiting thread due to lack of 3788 // a free slot. 3789 static HANDLE handles[MAXIMUM_WAIT_OBJECTS]; 3790 static int handle_count = 0; 3791 3792 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT; 3793 static CRITICAL_SECTION crit_sect; 3794 static volatile jint process_exiting = 0; 3795 int i, j; 3796 DWORD res; 3797 HANDLE hproc, hthr; 3798 3799 // The first thread that reached this point, initializes the critical section. 3800 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) { 3801 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__); 3802 } else if (OrderAccess::load_acquire(&process_exiting) == 0) { 3803 EnterCriticalSection(&crit_sect); 3804 3805 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) { 3806 // Remove from the array those handles of the threads that have completed exiting. 3807 for (i = 0, j = 0; i < handle_count; ++i) { 3808 res = WaitForSingleObject(handles[i], 0 /* don't wait */); 3809 if (res == WAIT_TIMEOUT) { 3810 handles[j++] = handles[i]; 3811 } else { 3812 if (res == WAIT_FAILED) { 3813 warning("WaitForSingleObject failed (%u) in %s: %d\n", 3814 GetLastError(), __FILE__, __LINE__); 3815 } 3816 // Don't keep the handle, if we failed waiting for it. 3817 CloseHandle(handles[i]); 3818 } 3819 } 3820 3821 // If there's no free slot in the array of the kept handles, we'll have to 3822 // wait until at least one thread completes exiting. 3823 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) { 3824 // Raise the priority of the oldest exiting thread to increase its chances 3825 // to complete sooner. 3826 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL); 3827 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT); 3828 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) { 3829 i = (res - WAIT_OBJECT_0); 3830 handle_count = MAXIMUM_WAIT_OBJECTS - 1; 3831 for (; i < handle_count; ++i) { 3832 handles[i] = handles[i + 1]; 3833 } 3834 } else { 3835 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3836 (res == WAIT_FAILED ? "failed" : "timed out"), 3837 GetLastError(), __FILE__, __LINE__); 3838 // Don't keep handles, if we failed waiting for them. 3839 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) { 3840 CloseHandle(handles[i]); 3841 } 3842 handle_count = 0; 3843 } 3844 } 3845 3846 // Store a duplicate of the current thread handle in the array of handles. 3847 hproc = GetCurrentProcess(); 3848 hthr = GetCurrentThread(); 3849 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count], 3850 0, FALSE, DUPLICATE_SAME_ACCESS)) { 3851 warning("DuplicateHandle failed (%u) in %s: %d\n", 3852 GetLastError(), __FILE__, __LINE__); 3853 } else { 3854 ++handle_count; 3855 } 3856 3857 // The current exiting thread has stored its handle in the array, and now 3858 // should leave the critical section before calling _endthreadex(). 3859 3860 } else if (what != EPT_THREAD) { 3861 if (handle_count > 0) { 3862 // Before ending the process, make sure all the threads that had called 3863 // _endthreadex() completed. 3864 3865 // Set the priority level of the current thread to the same value as 3866 // the priority level of exiting threads. 3867 // This is to ensure it will be given a fair chance to execute if 3868 // the timeout expires. 3869 hthr = GetCurrentThread(); 3870 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL); 3871 for (i = 0; i < handle_count; ++i) { 3872 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL); 3873 } 3874 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT); 3875 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) { 3876 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3877 (res == WAIT_FAILED ? "failed" : "timed out"), 3878 GetLastError(), __FILE__, __LINE__); 3879 } 3880 for (i = 0; i < handle_count; ++i) { 3881 CloseHandle(handles[i]); 3882 } 3883 handle_count = 0; 3884 } 3885 3886 OrderAccess::release_store(&process_exiting, 1); 3887 } 3888 3889 LeaveCriticalSection(&crit_sect); 3890 } 3891 3892 if (what == EPT_THREAD) { 3893 while (OrderAccess::load_acquire(&process_exiting) != 0) { 3894 // Some other thread is about to call exit(), so we 3895 // don't let the current thread proceed to _endthreadex() 3896 SuspendThread(GetCurrentThread()); 3897 // Avoid busy-wait loop, if SuspendThread() failed. 3898 Sleep(EXIT_TIMEOUT); 3899 } 3900 } 3901 } 3902 3903 // We are here if either 3904 // - there's no 'race at exit' bug on this OS release; 3905 // - initialization of the critical section failed (unlikely); 3906 // - the current thread has stored its handle and left the critical section; 3907 // - the process-exiting thread has raised the flag and left the critical section. 3908 if (what == EPT_THREAD) { 3909 _endthreadex((unsigned)exit_code); 3910 } else if (what == EPT_PROCESS) { 3911 ::exit(exit_code); 3912 } else { 3913 _exit(exit_code); 3914 } 3915 3916 // Should not reach here 3917 return exit_code; 3918 } 3919 3920 #undef EXIT_TIMEOUT 3921 3922 void os::win32::setmode_streams() { 3923 _setmode(_fileno(stdin), _O_BINARY); 3924 _setmode(_fileno(stdout), _O_BINARY); 3925 _setmode(_fileno(stderr), _O_BINARY); 3926 } 3927 3928 3929 bool os::is_debugger_attached() { 3930 return IsDebuggerPresent() ? true : false; 3931 } 3932 3933 3934 void os::wait_for_keypress_at_exit(void) { 3935 if (PauseAtExit) { 3936 fprintf(stderr, "Press any key to continue...\n"); 3937 fgetc(stdin); 3938 } 3939 } 3940 3941 3942 int os::message_box(const char* title, const char* message) { 3943 int result = MessageBox(NULL, message, title, 3944 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 3945 return result == IDYES; 3946 } 3947 3948 int os::allocate_thread_local_storage() { 3949 return TlsAlloc(); 3950 } 3951 3952 3953 void os::free_thread_local_storage(int index) { 3954 TlsFree(index); 3955 } 3956 3957 3958 void os::thread_local_storage_at_put(int index, void* value) { 3959 TlsSetValue(index, value); 3960 assert(thread_local_storage_at(index) == value, "Just checking"); 3961 } 3962 3963 3964 void* os::thread_local_storage_at(int index) { 3965 return TlsGetValue(index); 3966 } 3967 3968 3969 #ifndef PRODUCT 3970 #ifndef _WIN64 3971 // Helpers to check whether NX protection is enabled 3972 int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 3973 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 3974 pex->ExceptionRecord->NumberParameters > 0 && 3975 pex->ExceptionRecord->ExceptionInformation[0] == 3976 EXCEPTION_INFO_EXEC_VIOLATION) { 3977 return EXCEPTION_EXECUTE_HANDLER; 3978 } 3979 return EXCEPTION_CONTINUE_SEARCH; 3980 } 3981 3982 void nx_check_protection() { 3983 // If NX is enabled we'll get an exception calling into code on the stack 3984 char code[] = { (char)0xC3 }; // ret 3985 void *code_ptr = (void *)code; 3986 __try { 3987 __asm call code_ptr 3988 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 3989 tty->print_raw_cr("NX protection detected."); 3990 } 3991 } 3992 #endif // _WIN64 3993 #endif // PRODUCT 3994 3995 // this is called _before_ the global arguments have been parsed 3996 void os::init(void) { 3997 _initial_pid = _getpid(); 3998 3999 init_random(1234567); 4000 4001 win32::initialize_system_info(); 4002 win32::setmode_streams(); 4003 init_page_sizes((size_t) win32::vm_page_size()); 4004 4005 // This may be overridden later when argument processing is done. 4006 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, 4007 os::win32::is_windows_2003()); 4008 4009 // Initialize main_process and main_thread 4010 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 4011 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 4012 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 4013 fatal("DuplicateHandle failed\n"); 4014 } 4015 main_thread_id = (int) GetCurrentThreadId(); 4016 } 4017 4018 // To install functions for atexit processing 4019 extern "C" { 4020 static void perfMemory_exit_helper() { 4021 perfMemory_exit(); 4022 } 4023 } 4024 4025 static jint initSock(); 4026 4027 // this is called _after_ the global arguments have been parsed 4028 jint os::init_2(void) { 4029 // Allocate a single page and mark it as readable for safepoint polling 4030 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 4031 guarantee(polling_page != NULL, "Reserve Failed for polling page"); 4032 4033 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 4034 guarantee(return_page != NULL, "Commit Failed for polling page"); 4035 4036 os::set_polling_page(polling_page); 4037 4038 #ifndef PRODUCT 4039 if (Verbose && PrintMiscellaneous) { 4040 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", 4041 (intptr_t)polling_page); 4042 } 4043 #endif 4044 4045 if (!UseMembar) { 4046 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE); 4047 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 4048 4049 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE); 4050 guarantee(return_page != NULL, "Commit Failed for memory serialize page"); 4051 4052 os::set_memory_serialize_page(mem_serialize_page); 4053 4054 #ifndef PRODUCT 4055 if (Verbose && PrintMiscellaneous) { 4056 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", 4057 (intptr_t)mem_serialize_page); 4058 } 4059 #endif 4060 } 4061 4062 // Setup Windows Exceptions 4063 4064 // for debugging float code generation bugs 4065 if (ForceFloatExceptions) { 4066 #ifndef _WIN64 4067 static long fp_control_word = 0; 4068 __asm { fstcw fp_control_word } 4069 // see Intel PPro Manual, Vol. 2, p 7-16 4070 const long precision = 0x20; 4071 const long underflow = 0x10; 4072 const long overflow = 0x08; 4073 const long zero_div = 0x04; 4074 const long denorm = 0x02; 4075 const long invalid = 0x01; 4076 fp_control_word |= invalid; 4077 __asm { fldcw fp_control_word } 4078 #endif 4079 } 4080 4081 // If stack_commit_size is 0, windows will reserve the default size, 4082 // but only commit a small portion of it. 4083 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 4084 size_t default_reserve_size = os::win32::default_stack_size(); 4085 size_t actual_reserve_size = stack_commit_size; 4086 if (stack_commit_size < default_reserve_size) { 4087 // If stack_commit_size == 0, we want this too 4088 actual_reserve_size = default_reserve_size; 4089 } 4090 4091 // Check minimum allowable stack size for thread creation and to initialize 4092 // the java system classes, including StackOverflowError - depends on page 4093 // size. Add a page for compiler2 recursion in main thread. 4094 // Add in 2*BytesPerWord times page size to account for VM stack during 4095 // class initialization depending on 32 or 64 bit VM. 4096 size_t min_stack_allowed = 4097 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 4098 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size(); 4099 if (actual_reserve_size < min_stack_allowed) { 4100 tty->print_cr("\nThe stack size specified is too small, " 4101 "Specify at least %dk", 4102 min_stack_allowed / K); 4103 return JNI_ERR; 4104 } 4105 4106 JavaThread::set_stack_size_at_create(stack_commit_size); 4107 4108 // Calculate theoretical max. size of Threads to guard gainst artifical 4109 // out-of-memory situations, where all available address-space has been 4110 // reserved by thread stacks. 4111 assert(actual_reserve_size != 0, "Must have a stack"); 4112 4113 // Calculate the thread limit when we should start doing Virtual Memory 4114 // banging. Currently when the threads will have used all but 200Mb of space. 4115 // 4116 // TODO: consider performing a similar calculation for commit size instead 4117 // as reserve size, since on a 64-bit platform we'll run into that more 4118 // often than running out of virtual memory space. We can use the 4119 // lower value of the two calculations as the os_thread_limit. 4120 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 4121 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 4122 4123 // at exit methods are called in the reverse order of their registration. 4124 // there is no limit to the number of functions registered. atexit does 4125 // not set errno. 4126 4127 if (PerfAllowAtExitRegistration) { 4128 // only register atexit functions if PerfAllowAtExitRegistration is set. 4129 // atexit functions can be delayed until process exit time, which 4130 // can be problematic for embedded VM situations. Embedded VMs should 4131 // call DestroyJavaVM() to assure that VM resources are released. 4132 4133 // note: perfMemory_exit_helper atexit function may be removed in 4134 // the future if the appropriate cleanup code can be added to the 4135 // VM_Exit VMOperation's doit method. 4136 if (atexit(perfMemory_exit_helper) != 0) { 4137 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 4138 } 4139 } 4140 4141 #ifndef _WIN64 4142 // Print something if NX is enabled (win32 on AMD64) 4143 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 4144 #endif 4145 4146 // initialize thread priority policy 4147 prio_init(); 4148 4149 if (UseNUMA && !ForceNUMA) { 4150 UseNUMA = false; // We don't fully support this yet 4151 } 4152 4153 if (UseNUMAInterleaving) { 4154 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag 4155 bool success = numa_interleaving_init(); 4156 if (!success) UseNUMAInterleaving = false; 4157 } 4158 4159 if (initSock() != JNI_OK) { 4160 return JNI_ERR; 4161 } 4162 4163 return JNI_OK; 4164 } 4165 4166 // Mark the polling page as unreadable 4167 void os::make_polling_page_unreadable(void) { 4168 DWORD old_status; 4169 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4170 PAGE_NOACCESS, &old_status)) { 4171 fatal("Could not disable polling page"); 4172 } 4173 } 4174 4175 // Mark the polling page as readable 4176 void os::make_polling_page_readable(void) { 4177 DWORD old_status; 4178 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4179 PAGE_READONLY, &old_status)) { 4180 fatal("Could not enable polling page"); 4181 } 4182 } 4183 4184 4185 int os::stat(const char *path, struct stat *sbuf) { 4186 char pathbuf[MAX_PATH]; 4187 if (strlen(path) > MAX_PATH - 1) { 4188 errno = ENAMETOOLONG; 4189 return -1; 4190 } 4191 os::native_path(strcpy(pathbuf, path)); 4192 int ret = ::stat(pathbuf, sbuf); 4193 if (sbuf != NULL && UseUTCFileTimestamp) { 4194 // Fix for 6539723. st_mtime returned from stat() is dependent on 4195 // the system timezone and so can return different values for the 4196 // same file if/when daylight savings time changes. This adjustment 4197 // makes sure the same timestamp is returned regardless of the TZ. 4198 // 4199 // See: 4200 // http://msdn.microsoft.com/library/ 4201 // default.asp?url=/library/en-us/sysinfo/base/ 4202 // time_zone_information_str.asp 4203 // and 4204 // http://msdn.microsoft.com/library/default.asp?url= 4205 // /library/en-us/sysinfo/base/settimezoneinformation.asp 4206 // 4207 // NOTE: there is a insidious bug here: If the timezone is changed 4208 // after the call to stat() but before 'GetTimeZoneInformation()', then 4209 // the adjustment we do here will be wrong and we'll return the wrong 4210 // value (which will likely end up creating an invalid class data 4211 // archive). Absent a better API for this, or some time zone locking 4212 // mechanism, we'll have to live with this risk. 4213 TIME_ZONE_INFORMATION tz; 4214 DWORD tzid = GetTimeZoneInformation(&tz); 4215 int daylightBias = 4216 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 4217 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 4218 } 4219 return ret; 4220 } 4221 4222 4223 #define FT2INT64(ft) \ 4224 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 4225 4226 4227 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4228 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4229 // of a thread. 4230 // 4231 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4232 // the fast estimate available on the platform. 4233 4234 // current_thread_cpu_time() is not optimized for Windows yet 4235 jlong os::current_thread_cpu_time() { 4236 // return user + sys since the cost is the same 4237 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 4238 } 4239 4240 jlong os::thread_cpu_time(Thread* thread) { 4241 // consistent with what current_thread_cpu_time() returns. 4242 return os::thread_cpu_time(thread, true /* user+sys */); 4243 } 4244 4245 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4246 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4247 } 4248 4249 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 4250 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 4251 // If this function changes, os::is_thread_cpu_time_supported() should too 4252 if (os::win32::is_nt()) { 4253 FILETIME CreationTime; 4254 FILETIME ExitTime; 4255 FILETIME KernelTime; 4256 FILETIME UserTime; 4257 4258 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime, 4259 &ExitTime, &KernelTime, &UserTime) == 0) { 4260 return -1; 4261 } else if (user_sys_cpu_time) { 4262 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 4263 } else { 4264 return FT2INT64(UserTime) * 100; 4265 } 4266 } else { 4267 return (jlong) timeGetTime() * 1000000; 4268 } 4269 } 4270 4271 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4272 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4273 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4274 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4275 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4276 } 4277 4278 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4279 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4280 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4281 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4282 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4283 } 4284 4285 bool os::is_thread_cpu_time_supported() { 4286 // see os::thread_cpu_time 4287 if (os::win32::is_nt()) { 4288 FILETIME CreationTime; 4289 FILETIME ExitTime; 4290 FILETIME KernelTime; 4291 FILETIME UserTime; 4292 4293 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime, 4294 &KernelTime, &UserTime) == 0) { 4295 return false; 4296 } else { 4297 return true; 4298 } 4299 } else { 4300 return false; 4301 } 4302 } 4303 4304 // Windows does't provide a loadavg primitive so this is stubbed out for now. 4305 // It does have primitives (PDH API) to get CPU usage and run queue length. 4306 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 4307 // If we wanted to implement loadavg on Windows, we have a few options: 4308 // 4309 // a) Query CPU usage and run queue length and "fake" an answer by 4310 // returning the CPU usage if it's under 100%, and the run queue 4311 // length otherwise. It turns out that querying is pretty slow 4312 // on Windows, on the order of 200 microseconds on a fast machine. 4313 // Note that on the Windows the CPU usage value is the % usage 4314 // since the last time the API was called (and the first call 4315 // returns 100%), so we'd have to deal with that as well. 4316 // 4317 // b) Sample the "fake" answer using a sampling thread and store 4318 // the answer in a global variable. The call to loadavg would 4319 // just return the value of the global, avoiding the slow query. 4320 // 4321 // c) Sample a better answer using exponential decay to smooth the 4322 // value. This is basically the algorithm used by UNIX kernels. 4323 // 4324 // Note that sampling thread starvation could affect both (b) and (c). 4325 int os::loadavg(double loadavg[], int nelem) { 4326 return -1; 4327 } 4328 4329 4330 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 4331 bool os::dont_yield() { 4332 return DontYieldALot; 4333 } 4334 4335 // This method is a slightly reworked copy of JDK's sysOpen 4336 // from src/windows/hpi/src/sys_api_md.c 4337 4338 int os::open(const char *path, int oflag, int mode) { 4339 char pathbuf[MAX_PATH]; 4340 4341 if (strlen(path) > MAX_PATH - 1) { 4342 errno = ENAMETOOLONG; 4343 return -1; 4344 } 4345 os::native_path(strcpy(pathbuf, path)); 4346 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 4347 } 4348 4349 FILE* os::open(int fd, const char* mode) { 4350 return ::_fdopen(fd, mode); 4351 } 4352 4353 // Is a (classpath) directory empty? 4354 bool os::dir_is_empty(const char* path) { 4355 WIN32_FIND_DATA fd; 4356 HANDLE f = FindFirstFile(path, &fd); 4357 if (f == INVALID_HANDLE_VALUE) { 4358 return true; 4359 } 4360 FindClose(f); 4361 return false; 4362 } 4363 4364 // create binary file, rewriting existing file if required 4365 int os::create_binary_file(const char* path, bool rewrite_existing) { 4366 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 4367 if (!rewrite_existing) { 4368 oflags |= _O_EXCL; 4369 } 4370 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 4371 } 4372 4373 // return current position of file pointer 4374 jlong os::current_file_offset(int fd) { 4375 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 4376 } 4377 4378 // move file pointer to the specified offset 4379 jlong os::seek_to_file_offset(int fd, jlong offset) { 4380 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 4381 } 4382 4383 4384 jlong os::lseek(int fd, jlong offset, int whence) { 4385 return (jlong) ::_lseeki64(fd, offset, whence); 4386 } 4387 4388 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 4389 OVERLAPPED ov; 4390 DWORD nread; 4391 BOOL result; 4392 4393 ZeroMemory(&ov, sizeof(ov)); 4394 ov.Offset = (DWORD)offset; 4395 ov.OffsetHigh = (DWORD)(offset >> 32); 4396 4397 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4398 4399 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov); 4400 4401 return result ? nread : 0; 4402 } 4403 4404 4405 // This method is a slightly reworked copy of JDK's sysNativePath 4406 // from src/windows/hpi/src/path_md.c 4407 4408 // Convert a pathname to native format. On win32, this involves forcing all 4409 // separators to be '\\' rather than '/' (both are legal inputs, but Win95 4410 // sometimes rejects '/') and removing redundant separators. The input path is 4411 // assumed to have been converted into the character encoding used by the local 4412 // system. Because this might be a double-byte encoding, care is taken to 4413 // treat double-byte lead characters correctly. 4414 // 4415 // This procedure modifies the given path in place, as the result is never 4416 // longer than the original. There is no error return; this operation always 4417 // succeeds. 4418 char * os::native_path(char *path) { 4419 char *src = path, *dst = path, *end = path; 4420 char *colon = NULL; // If a drive specifier is found, this will 4421 // point to the colon following the drive letter 4422 4423 // Assumption: '/', '\\', ':', and drive letters are never lead bytes 4424 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\')) 4425 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte"); 4426 4427 // Check for leading separators 4428 #define isfilesep(c) ((c) == '/' || (c) == '\\') 4429 while (isfilesep(*src)) { 4430 src++; 4431 } 4432 4433 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 4434 // Remove leading separators if followed by drive specifier. This 4435 // hack is necessary to support file URLs containing drive 4436 // specifiers (e.g., "file://c:/path"). As a side effect, 4437 // "/c:/path" can be used as an alternative to "c:/path". 4438 *dst++ = *src++; 4439 colon = dst; 4440 *dst++ = ':'; 4441 src++; 4442 } else { 4443 src = path; 4444 if (isfilesep(src[0]) && isfilesep(src[1])) { 4445 // UNC pathname: Retain first separator; leave src pointed at 4446 // second separator so that further separators will be collapsed 4447 // into the second separator. The result will be a pathname 4448 // beginning with "\\\\" followed (most likely) by a host name. 4449 src = dst = path + 1; 4450 path[0] = '\\'; // Force first separator to '\\' 4451 } 4452 } 4453 4454 end = dst; 4455 4456 // Remove redundant separators from remainder of path, forcing all 4457 // separators to be '\\' rather than '/'. Also, single byte space 4458 // characters are removed from the end of the path because those 4459 // are not legal ending characters on this operating system. 4460 // 4461 while (*src != '\0') { 4462 if (isfilesep(*src)) { 4463 *dst++ = '\\'; src++; 4464 while (isfilesep(*src)) src++; 4465 if (*src == '\0') { 4466 // Check for trailing separator 4467 end = dst; 4468 if (colon == dst - 2) break; // "z:\\" 4469 if (dst == path + 1) break; // "\\" 4470 if (dst == path + 2 && isfilesep(path[0])) { 4471 // "\\\\" is not collapsed to "\\" because "\\\\" marks the 4472 // beginning of a UNC pathname. Even though it is not, by 4473 // itself, a valid UNC pathname, we leave it as is in order 4474 // to be consistent with the path canonicalizer as well 4475 // as the win32 APIs, which treat this case as an invalid 4476 // UNC pathname rather than as an alias for the root 4477 // directory of the current drive. 4478 break; 4479 } 4480 end = --dst; // Path does not denote a root directory, so 4481 // remove trailing separator 4482 break; 4483 } 4484 end = dst; 4485 } else { 4486 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character 4487 *dst++ = *src++; 4488 if (*src) *dst++ = *src++; 4489 end = dst; 4490 } else { // Copy a single-byte character 4491 char c = *src++; 4492 *dst++ = c; 4493 // Space is not a legal ending character 4494 if (c != ' ') end = dst; 4495 } 4496 } 4497 } 4498 4499 *end = '\0'; 4500 4501 // For "z:", add "." to work around a bug in the C runtime library 4502 if (colon == dst - 1) { 4503 path[2] = '.'; 4504 path[3] = '\0'; 4505 } 4506 4507 return path; 4508 } 4509 4510 // This code is a copy of JDK's sysSetLength 4511 // from src/windows/hpi/src/sys_api_md.c 4512 4513 int os::ftruncate(int fd, jlong length) { 4514 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4515 long high = (long)(length >> 32); 4516 DWORD ret; 4517 4518 if (h == (HANDLE)(-1)) { 4519 return -1; 4520 } 4521 4522 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 4523 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 4524 return -1; 4525 } 4526 4527 if (::SetEndOfFile(h) == FALSE) { 4528 return -1; 4529 } 4530 4531 return 0; 4532 } 4533 4534 4535 // This code is a copy of JDK's sysSync 4536 // from src/windows/hpi/src/sys_api_md.c 4537 // except for the legacy workaround for a bug in Win 98 4538 4539 int os::fsync(int fd) { 4540 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 4541 4542 if ((!::FlushFileBuffers(handle)) && 4543 (GetLastError() != ERROR_ACCESS_DENIED)) { 4544 // from winerror.h 4545 return -1; 4546 } 4547 return 0; 4548 } 4549 4550 static int nonSeekAvailable(int, long *); 4551 static int stdinAvailable(int, long *); 4552 4553 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR) 4554 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO) 4555 4556 // This code is a copy of JDK's sysAvailable 4557 // from src/windows/hpi/src/sys_api_md.c 4558 4559 int os::available(int fd, jlong *bytes) { 4560 jlong cur, end; 4561 struct _stati64 stbuf64; 4562 4563 if (::_fstati64(fd, &stbuf64) >= 0) { 4564 int mode = stbuf64.st_mode; 4565 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 4566 int ret; 4567 long lpbytes; 4568 if (fd == 0) { 4569 ret = stdinAvailable(fd, &lpbytes); 4570 } else { 4571 ret = nonSeekAvailable(fd, &lpbytes); 4572 } 4573 (*bytes) = (jlong)(lpbytes); 4574 return ret; 4575 } 4576 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 4577 return FALSE; 4578 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 4579 return FALSE; 4580 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 4581 return FALSE; 4582 } 4583 *bytes = end - cur; 4584 return TRUE; 4585 } else { 4586 return FALSE; 4587 } 4588 } 4589 4590 // This code is a copy of JDK's nonSeekAvailable 4591 // from src/windows/hpi/src/sys_api_md.c 4592 4593 static int nonSeekAvailable(int fd, long *pbytes) { 4594 // This is used for available on non-seekable devices 4595 // (like both named and anonymous pipes, such as pipes 4596 // connected to an exec'd process). 4597 // Standard Input is a special case. 4598 HANDLE han; 4599 4600 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 4601 return FALSE; 4602 } 4603 4604 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 4605 // PeekNamedPipe fails when at EOF. In that case we 4606 // simply make *pbytes = 0 which is consistent with the 4607 // behavior we get on Solaris when an fd is at EOF. 4608 // The only alternative is to raise an Exception, 4609 // which isn't really warranted. 4610 // 4611 if (::GetLastError() != ERROR_BROKEN_PIPE) { 4612 return FALSE; 4613 } 4614 *pbytes = 0; 4615 } 4616 return TRUE; 4617 } 4618 4619 #define MAX_INPUT_EVENTS 2000 4620 4621 // This code is a copy of JDK's stdinAvailable 4622 // from src/windows/hpi/src/sys_api_md.c 4623 4624 static int stdinAvailable(int fd, long *pbytes) { 4625 HANDLE han; 4626 DWORD numEventsRead = 0; // Number of events read from buffer 4627 DWORD numEvents = 0; // Number of events in buffer 4628 DWORD i = 0; // Loop index 4629 DWORD curLength = 0; // Position marker 4630 DWORD actualLength = 0; // Number of bytes readable 4631 BOOL error = FALSE; // Error holder 4632 INPUT_RECORD *lpBuffer; // Pointer to records of input events 4633 4634 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4635 return FALSE; 4636 } 4637 4638 // Construct an array of input records in the console buffer 4639 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4640 if (error == 0) { 4641 return nonSeekAvailable(fd, pbytes); 4642 } 4643 4644 // lpBuffer must fit into 64K or else PeekConsoleInput fails 4645 if (numEvents > MAX_INPUT_EVENTS) { 4646 numEvents = MAX_INPUT_EVENTS; 4647 } 4648 4649 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal); 4650 if (lpBuffer == NULL) { 4651 return FALSE; 4652 } 4653 4654 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4655 if (error == 0) { 4656 os::free(lpBuffer); 4657 return FALSE; 4658 } 4659 4660 // Examine input records for the number of bytes available 4661 for (i=0; i<numEvents; i++) { 4662 if (lpBuffer[i].EventType == KEY_EVENT) { 4663 4664 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4665 &(lpBuffer[i].Event); 4666 if (keyRecord->bKeyDown == TRUE) { 4667 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4668 curLength++; 4669 if (*keyPressed == '\r') { 4670 actualLength = curLength; 4671 } 4672 } 4673 } 4674 } 4675 4676 if (lpBuffer != NULL) { 4677 os::free(lpBuffer); 4678 } 4679 4680 *pbytes = (long) actualLength; 4681 return TRUE; 4682 } 4683 4684 // Map a block of memory. 4685 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4686 char *addr, size_t bytes, bool read_only, 4687 bool allow_exec) { 4688 HANDLE hFile; 4689 char* base; 4690 4691 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4692 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4693 if (hFile == NULL) { 4694 if (PrintMiscellaneous && Verbose) { 4695 DWORD err = GetLastError(); 4696 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err); 4697 } 4698 return NULL; 4699 } 4700 4701 if (allow_exec) { 4702 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4703 // unless it comes from a PE image (which the shared archive is not.) 4704 // Even VirtualProtect refuses to give execute access to mapped memory 4705 // that was not previously executable. 4706 // 4707 // Instead, stick the executable region in anonymous memory. Yuck. 4708 // Penalty is that ~4 pages will not be shareable - in the future 4709 // we might consider DLLizing the shared archive with a proper PE 4710 // header so that mapping executable + sharing is possible. 4711 4712 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4713 PAGE_READWRITE); 4714 if (base == NULL) { 4715 if (PrintMiscellaneous && Verbose) { 4716 DWORD err = GetLastError(); 4717 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 4718 } 4719 CloseHandle(hFile); 4720 return NULL; 4721 } 4722 4723 DWORD bytes_read; 4724 OVERLAPPED overlapped; 4725 overlapped.Offset = (DWORD)file_offset; 4726 overlapped.OffsetHigh = 0; 4727 overlapped.hEvent = NULL; 4728 // ReadFile guarantees that if the return value is true, the requested 4729 // number of bytes were read before returning. 4730 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 4731 if (!res) { 4732 if (PrintMiscellaneous && Verbose) { 4733 DWORD err = GetLastError(); 4734 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 4735 } 4736 release_memory(base, bytes); 4737 CloseHandle(hFile); 4738 return NULL; 4739 } 4740 } else { 4741 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 4742 NULL /* file_name */); 4743 if (hMap == NULL) { 4744 if (PrintMiscellaneous && Verbose) { 4745 DWORD err = GetLastError(); 4746 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err); 4747 } 4748 CloseHandle(hFile); 4749 return NULL; 4750 } 4751 4752 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 4753 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 4754 (DWORD)bytes, addr); 4755 if (base == NULL) { 4756 if (PrintMiscellaneous && Verbose) { 4757 DWORD err = GetLastError(); 4758 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 4759 } 4760 CloseHandle(hMap); 4761 CloseHandle(hFile); 4762 return NULL; 4763 } 4764 4765 if (CloseHandle(hMap) == 0) { 4766 if (PrintMiscellaneous && Verbose) { 4767 DWORD err = GetLastError(); 4768 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 4769 } 4770 CloseHandle(hFile); 4771 return base; 4772 } 4773 } 4774 4775 if (allow_exec) { 4776 DWORD old_protect; 4777 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 4778 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 4779 4780 if (!res) { 4781 if (PrintMiscellaneous && Verbose) { 4782 DWORD err = GetLastError(); 4783 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 4784 } 4785 // Don't consider this a hard error, on IA32 even if the 4786 // VirtualProtect fails, we should still be able to execute 4787 CloseHandle(hFile); 4788 return base; 4789 } 4790 } 4791 4792 if (CloseHandle(hFile) == 0) { 4793 if (PrintMiscellaneous && Verbose) { 4794 DWORD err = GetLastError(); 4795 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 4796 } 4797 return base; 4798 } 4799 4800 return base; 4801 } 4802 4803 4804 // Remap a block of memory. 4805 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4806 char *addr, size_t bytes, bool read_only, 4807 bool allow_exec) { 4808 // This OS does not allow existing memory maps to be remapped so we 4809 // have to unmap the memory before we remap it. 4810 if (!os::unmap_memory(addr, bytes)) { 4811 return NULL; 4812 } 4813 4814 // There is a very small theoretical window between the unmap_memory() 4815 // call above and the map_memory() call below where a thread in native 4816 // code may be able to access an address that is no longer mapped. 4817 4818 return os::map_memory(fd, file_name, file_offset, addr, bytes, 4819 read_only, allow_exec); 4820 } 4821 4822 4823 // Unmap a block of memory. 4824 // Returns true=success, otherwise false. 4825 4826 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4827 BOOL result = UnmapViewOfFile(addr); 4828 if (result == 0) { 4829 if (PrintMiscellaneous && Verbose) { 4830 DWORD err = GetLastError(); 4831 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 4832 } 4833 return false; 4834 } 4835 return true; 4836 } 4837 4838 void os::pause() { 4839 char filename[MAX_PATH]; 4840 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4841 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4842 } else { 4843 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4844 } 4845 4846 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4847 if (fd != -1) { 4848 struct stat buf; 4849 ::close(fd); 4850 while (::stat(filename, &buf) == 0) { 4851 Sleep(100); 4852 } 4853 } else { 4854 jio_fprintf(stderr, 4855 "Could not open pause file '%s', continuing immediately.\n", filename); 4856 } 4857 } 4858 4859 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 4860 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 4861 } 4862 4863 // See the caveats for this class in os_windows.hpp 4864 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back 4865 // into this method and returns false. If no OS EXCEPTION was raised, returns 4866 // true. 4867 // The callback is supposed to provide the method that should be protected. 4868 // 4869 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 4870 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); 4871 assert(!WatcherThread::watcher_thread()->has_crash_protection(), 4872 "crash_protection already set?"); 4873 4874 bool success = true; 4875 __try { 4876 WatcherThread::watcher_thread()->set_crash_protection(this); 4877 cb.call(); 4878 } __except(EXCEPTION_EXECUTE_HANDLER) { 4879 // only for protection, nothing to do 4880 success = false; 4881 } 4882 WatcherThread::watcher_thread()->set_crash_protection(NULL); 4883 return success; 4884 } 4885 4886 // An Event wraps a win32 "CreateEvent" kernel handle. 4887 // 4888 // We have a number of choices regarding "CreateEvent" win32 handle leakage: 4889 // 4890 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 4891 // field, and call CloseHandle() on the win32 event handle. Unpark() would 4892 // need to be modified to tolerate finding a NULL (invalid) win32 event handle. 4893 // In addition, an unpark() operation might fetch the handle field, but the 4894 // event could recycle between the fetch and the SetEvent() operation. 4895 // SetEvent() would either fail because the handle was invalid, or inadvertently work, 4896 // as the win32 handle value had been recycled. In an ideal world calling SetEvent() 4897 // on an stale but recycled handle would be harmless, but in practice this might 4898 // confuse other non-Sun code, so it's not a viable approach. 4899 // 4900 // 2: Once a win32 event handle is associated with an Event, it remains associated 4901 // with the Event. The event handle is never closed. This could be construed 4902 // as handle leakage, but only up to the maximum # of threads that have been extant 4903 // at any one time. This shouldn't be an issue, as windows platforms typically 4904 // permit a process to have hundreds of thousands of open handles. 4905 // 4906 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 4907 // and release unused handles. 4908 // 4909 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 4910 // It's not clear, however, that we wouldn't be trading one type of leak for another. 4911 // 4912 // 5. Use an RCU-like mechanism (Read-Copy Update). 4913 // Or perhaps something similar to Maged Michael's "Hazard pointers". 4914 // 4915 // We use (2). 4916 // 4917 // TODO-FIXME: 4918 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 4919 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 4920 // to recover from (or at least detect) the dreaded Windows 841176 bug. 4921 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 4922 // into a single win32 CreateEvent() handle. 4923 // 4924 // Assumption: 4925 // Only one parker can exist on an event, which is why we allocate 4926 // them per-thread. Multiple unparkers can coexist. 4927 // 4928 // _Event transitions in park() 4929 // -1 => -1 : illegal 4930 // 1 => 0 : pass - return immediately 4931 // 0 => -1 : block; then set _Event to 0 before returning 4932 // 4933 // _Event transitions in unpark() 4934 // 0 => 1 : just return 4935 // 1 => 1 : just return 4936 // -1 => either 0 or 1; must signal target thread 4937 // That is, we can safely transition _Event from -1 to either 4938 // 0 or 1. 4939 // 4940 // _Event serves as a restricted-range semaphore. 4941 // -1 : thread is blocked, i.e. there is a waiter 4942 // 0 : neutral: thread is running or ready, 4943 // could have been signaled after a wait started 4944 // 1 : signaled - thread is running or ready 4945 // 4946 // Another possible encoding of _Event would be with 4947 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 4948 // 4949 4950 int os::PlatformEvent::park(jlong Millis) { 4951 // Transitions for _Event: 4952 // -1 => -1 : illegal 4953 // 1 => 0 : pass - return immediately 4954 // 0 => -1 : block; then set _Event to 0 before returning 4955 4956 guarantee(_ParkHandle != NULL , "Invariant"); 4957 guarantee(Millis > 0 , "Invariant"); 4958 4959 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 4960 // the initial park() operation. 4961 // Consider: use atomic decrement instead of CAS-loop 4962 4963 int v; 4964 for (;;) { 4965 v = _Event; 4966 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4967 } 4968 guarantee((v == 0) || (v == 1), "invariant"); 4969 if (v != 0) return OS_OK; 4970 4971 // Do this the hard way by blocking ... 4972 // TODO: consider a brief spin here, gated on the success of recent 4973 // spin attempts by this thread. 4974 // 4975 // We decompose long timeouts into series of shorter timed waits. 4976 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 4977 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 4978 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 4979 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 4980 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 4981 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 4982 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 4983 // for the already waited time. This policy does not admit any new outcomes. 4984 // In the future, however, we might want to track the accumulated wait time and 4985 // adjust Millis accordingly if we encounter a spurious wakeup. 4986 4987 const int MAXTIMEOUT = 0x10000000; 4988 DWORD rv = WAIT_TIMEOUT; 4989 while (_Event < 0 && Millis > 0) { 4990 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT) 4991 if (Millis > MAXTIMEOUT) { 4992 prd = MAXTIMEOUT; 4993 } 4994 rv = ::WaitForSingleObject(_ParkHandle, prd); 4995 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed"); 4996 if (rv == WAIT_TIMEOUT) { 4997 Millis -= prd; 4998 } 4999 } 5000 v = _Event; 5001 _Event = 0; 5002 // see comment at end of os::PlatformEvent::park() below: 5003 OrderAccess::fence(); 5004 // If we encounter a nearly simultanous timeout expiry and unpark() 5005 // we return OS_OK indicating we awoke via unpark(). 5006 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 5007 return (v >= 0) ? OS_OK : OS_TIMEOUT; 5008 } 5009 5010 void os::PlatformEvent::park() { 5011 // Transitions for _Event: 5012 // -1 => -1 : illegal 5013 // 1 => 0 : pass - return immediately 5014 // 0 => -1 : block; then set _Event to 0 before returning 5015 5016 guarantee(_ParkHandle != NULL, "Invariant"); 5017 // Invariant: Only the thread associated with the Event/PlatformEvent 5018 // may call park(). 5019 // Consider: use atomic decrement instead of CAS-loop 5020 int v; 5021 for (;;) { 5022 v = _Event; 5023 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5024 } 5025 guarantee((v == 0) || (v == 1), "invariant"); 5026 if (v != 0) return; 5027 5028 // Do this the hard way by blocking ... 5029 // TODO: consider a brief spin here, gated on the success of recent 5030 // spin attempts by this thread. 5031 while (_Event < 0) { 5032 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE); 5033 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed"); 5034 } 5035 5036 // Usually we'll find _Event == 0 at this point, but as 5037 // an optional optimization we clear it, just in case can 5038 // multiple unpark() operations drove _Event up to 1. 5039 _Event = 0; 5040 OrderAccess::fence(); 5041 guarantee(_Event >= 0, "invariant"); 5042 } 5043 5044 void os::PlatformEvent::unpark() { 5045 guarantee(_ParkHandle != NULL, "Invariant"); 5046 5047 // Transitions for _Event: 5048 // 0 => 1 : just return 5049 // 1 => 1 : just return 5050 // -1 => either 0 or 1; must signal target thread 5051 // That is, we can safely transition _Event from -1 to either 5052 // 0 or 1. 5053 // See also: "Semaphores in Plan 9" by Mullender & Cox 5054 // 5055 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5056 // that it will take two back-to-back park() calls for the owning 5057 // thread to block. This has the benefit of forcing a spurious return 5058 // from the first park() call after an unpark() call which will help 5059 // shake out uses of park() and unpark() without condition variables. 5060 5061 if (Atomic::xchg(1, &_Event) >= 0) return; 5062 5063 ::SetEvent(_ParkHandle); 5064 } 5065 5066 5067 // JSR166 5068 // ------------------------------------------------------- 5069 5070 // The Windows implementation of Park is very straightforward: Basic 5071 // operations on Win32 Events turn out to have the right semantics to 5072 // use them directly. We opportunistically resuse the event inherited 5073 // from Monitor. 5074 5075 void Parker::park(bool isAbsolute, jlong time) { 5076 guarantee(_ParkEvent != NULL, "invariant"); 5077 // First, demultiplex/decode time arguments 5078 if (time < 0) { // don't wait 5079 return; 5080 } else if (time == 0 && !isAbsolute) { 5081 time = INFINITE; 5082 } else if (isAbsolute) { 5083 time -= os::javaTimeMillis(); // convert to relative time 5084 if (time <= 0) { // already elapsed 5085 return; 5086 } 5087 } else { // relative 5088 time /= 1000000; // Must coarsen from nanos to millis 5089 if (time == 0) { // Wait for the minimal time unit if zero 5090 time = 1; 5091 } 5092 } 5093 5094 JavaThread* thread = (JavaThread*)(Thread::current()); 5095 assert(thread->is_Java_thread(), "Must be JavaThread"); 5096 JavaThread *jt = (JavaThread *)thread; 5097 5098 // Don't wait if interrupted or already triggered 5099 if (Thread::is_interrupted(thread, false) || 5100 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 5101 ResetEvent(_ParkEvent); 5102 return; 5103 } else { 5104 ThreadBlockInVM tbivm(jt); 5105 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5106 jt->set_suspend_equivalent(); 5107 5108 WaitForSingleObject(_ParkEvent, time); 5109 ResetEvent(_ParkEvent); 5110 5111 // If externally suspended while waiting, re-suspend 5112 if (jt->handle_special_suspend_equivalent_condition()) { 5113 jt->java_suspend_self(); 5114 } 5115 } 5116 } 5117 5118 void Parker::unpark() { 5119 guarantee(_ParkEvent != NULL, "invariant"); 5120 SetEvent(_ParkEvent); 5121 } 5122 5123 // Run the specified command in a separate process. Return its exit value, 5124 // or -1 on failure (e.g. can't create a new process). 5125 int os::fork_and_exec(char* cmd) { 5126 STARTUPINFO si; 5127 PROCESS_INFORMATION pi; 5128 5129 memset(&si, 0, sizeof(si)); 5130 si.cb = sizeof(si); 5131 memset(&pi, 0, sizeof(pi)); 5132 BOOL rslt = CreateProcess(NULL, // executable name - use command line 5133 cmd, // command line 5134 NULL, // process security attribute 5135 NULL, // thread security attribute 5136 TRUE, // inherits system handles 5137 0, // no creation flags 5138 NULL, // use parent's environment block 5139 NULL, // use parent's starting directory 5140 &si, // (in) startup information 5141 &pi); // (out) process information 5142 5143 if (rslt) { 5144 // Wait until child process exits. 5145 WaitForSingleObject(pi.hProcess, INFINITE); 5146 5147 DWORD exit_code; 5148 GetExitCodeProcess(pi.hProcess, &exit_code); 5149 5150 // Close process and thread handles. 5151 CloseHandle(pi.hProcess); 5152 CloseHandle(pi.hThread); 5153 5154 return (int)exit_code; 5155 } else { 5156 return -1; 5157 } 5158 } 5159 5160 //-------------------------------------------------------------------------------------------------- 5161 // Non-product code 5162 5163 static int mallocDebugIntervalCounter = 0; 5164 static int mallocDebugCounter = 0; 5165 bool os::check_heap(bool force) { 5166 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 5167 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 5168 // Note: HeapValidate executes two hardware breakpoints when it finds something 5169 // wrong; at these points, eax contains the address of the offending block (I think). 5170 // To get to the exlicit error message(s) below, just continue twice. 5171 HANDLE heap = GetProcessHeap(); 5172 5173 // If we fail to lock the heap, then gflags.exe has been used 5174 // or some other special heap flag has been set that prevents 5175 // locking. We don't try to walk a heap we can't lock. 5176 if (HeapLock(heap) != 0) { 5177 PROCESS_HEAP_ENTRY phe; 5178 phe.lpData = NULL; 5179 while (HeapWalk(heap, &phe) != 0) { 5180 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 5181 !HeapValidate(heap, 0, phe.lpData)) { 5182 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 5183 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 5184 fatal("corrupted C heap"); 5185 } 5186 } 5187 DWORD err = GetLastError(); 5188 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 5189 fatal(err_msg("heap walk aborted with error %d", err)); 5190 } 5191 HeapUnlock(heap); 5192 } 5193 mallocDebugIntervalCounter = 0; 5194 } 5195 return true; 5196 } 5197 5198 5199 bool os::find(address addr, outputStream* st) { 5200 // Nothing yet 5201 return false; 5202 } 5203 5204 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 5205 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 5206 5207 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 5208 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow(); 5209 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 5210 address addr = (address) exceptionRecord->ExceptionInformation[1]; 5211 5212 if (os::is_memory_serialize_page(thread, addr)) { 5213 return EXCEPTION_CONTINUE_EXECUTION; 5214 } 5215 } 5216 5217 return EXCEPTION_CONTINUE_SEARCH; 5218 } 5219 5220 // We don't build a headless jre for Windows 5221 bool os::is_headless_jre() { return false; } 5222 5223 static jint initSock() { 5224 WSADATA wsadata; 5225 5226 if (!os::WinSock2Dll::WinSock2Available()) { 5227 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n", 5228 ::GetLastError()); 5229 return JNI_ERR; 5230 } 5231 5232 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) { 5233 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n", 5234 ::GetLastError()); 5235 return JNI_ERR; 5236 } 5237 return JNI_OK; 5238 } 5239 5240 struct hostent* os::get_host_by_name(char* name) { 5241 return (struct hostent*)os::WinSock2Dll::gethostbyname(name); 5242 } 5243 5244 int os::socket_close(int fd) { 5245 return ::closesocket(fd); 5246 } 5247 5248 int os::socket(int domain, int type, int protocol) { 5249 return ::socket(domain, type, protocol); 5250 } 5251 5252 int os::connect(int fd, struct sockaddr* him, socklen_t len) { 5253 return ::connect(fd, him, len); 5254 } 5255 5256 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5257 return ::recv(fd, buf, (int)nBytes, flags); 5258 } 5259 5260 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5261 return ::send(fd, buf, (int)nBytes, flags); 5262 } 5263 5264 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5265 return ::send(fd, buf, (int)nBytes, flags); 5266 } 5267 5268 // WINDOWS CONTEXT Flags for THREAD_SAMPLING 5269 #if defined(IA32) 5270 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS) 5271 #elif defined (AMD64) 5272 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT) 5273 #endif 5274 5275 // returns true if thread could be suspended, 5276 // false otherwise 5277 static bool do_suspend(HANDLE* h) { 5278 if (h != NULL) { 5279 if (SuspendThread(*h) != ~0) { 5280 return true; 5281 } 5282 } 5283 return false; 5284 } 5285 5286 // resume the thread 5287 // calling resume on an active thread is a no-op 5288 static void do_resume(HANDLE* h) { 5289 if (h != NULL) { 5290 ResumeThread(*h); 5291 } 5292 } 5293 5294 // retrieve a suspend/resume context capable handle 5295 // from the tid. Caller validates handle return value. 5296 void get_thread_handle_for_extended_context(HANDLE* h, 5297 OSThread::thread_id_t tid) { 5298 if (h != NULL) { 5299 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid); 5300 } 5301 } 5302 5303 // Thread sampling implementation 5304 // 5305 void os::SuspendedThreadTask::internal_do_task() { 5306 CONTEXT ctxt; 5307 HANDLE h = NULL; 5308 5309 // get context capable handle for thread 5310 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id()); 5311 5312 // sanity 5313 if (h == NULL || h == INVALID_HANDLE_VALUE) { 5314 return; 5315 } 5316 5317 // suspend the thread 5318 if (do_suspend(&h)) { 5319 ctxt.ContextFlags = sampling_context_flags; 5320 // get thread context 5321 GetThreadContext(h, &ctxt); 5322 SuspendedThreadTaskContext context(_thread, &ctxt); 5323 // pass context to Thread Sampling impl 5324 do_task(context); 5325 // resume thread 5326 do_resume(&h); 5327 } 5328 5329 // close handle 5330 CloseHandle(h); 5331 } 5332 5333 5334 // Kernel32 API 5335 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void); 5336 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD); 5337 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG); 5338 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG); 5339 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG); 5340 5341 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL; 5342 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL; 5343 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL; 5344 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL; 5345 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL; 5346 5347 5348 BOOL os::Kernel32Dll::initialized = FALSE; 5349 SIZE_T os::Kernel32Dll::GetLargePageMinimum() { 5350 assert(initialized && _GetLargePageMinimum != NULL, 5351 "GetLargePageMinimumAvailable() not yet called"); 5352 return _GetLargePageMinimum(); 5353 } 5354 5355 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() { 5356 if (!initialized) { 5357 initialize(); 5358 } 5359 return _GetLargePageMinimum != NULL; 5360 } 5361 5362 BOOL os::Kernel32Dll::NumaCallsAvailable() { 5363 if (!initialized) { 5364 initialize(); 5365 } 5366 return _VirtualAllocExNuma != NULL; 5367 } 5368 5369 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, 5370 SIZE_T bytes, DWORD flags, 5371 DWORD prot, DWORD node) { 5372 assert(initialized && _VirtualAllocExNuma != NULL, 5373 "NUMACallsAvailable() not yet called"); 5374 5375 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node); 5376 } 5377 5378 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) { 5379 assert(initialized && _GetNumaHighestNodeNumber != NULL, 5380 "NUMACallsAvailable() not yet called"); 5381 5382 return _GetNumaHighestNodeNumber(ptr_highest_node_number); 5383 } 5384 5385 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, 5386 PULONGLONG proc_mask) { 5387 assert(initialized && _GetNumaNodeProcessorMask != NULL, 5388 "NUMACallsAvailable() not yet called"); 5389 5390 return _GetNumaNodeProcessorMask(node, proc_mask); 5391 } 5392 5393 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip, 5394 ULONG FrameToCapture, 5395 PVOID* BackTrace, 5396 PULONG BackTraceHash) { 5397 if (!initialized) { 5398 initialize(); 5399 } 5400 5401 if (_RtlCaptureStackBackTrace != NULL) { 5402 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture, 5403 BackTrace, BackTraceHash); 5404 } else { 5405 return 0; 5406 } 5407 } 5408 5409 void os::Kernel32Dll::initializeCommon() { 5410 if (!initialized) { 5411 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5412 assert(handle != NULL, "Just check"); 5413 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum"); 5414 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma"); 5415 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber"); 5416 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask"); 5417 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace"); 5418 initialized = TRUE; 5419 } 5420 } 5421 5422 5423 5424 #ifndef JDK6_OR_EARLIER 5425 5426 void os::Kernel32Dll::initialize() { 5427 initializeCommon(); 5428 } 5429 5430 5431 // Kernel32 API 5432 inline BOOL os::Kernel32Dll::SwitchToThread() { 5433 return ::SwitchToThread(); 5434 } 5435 5436 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5437 return true; 5438 } 5439 5440 // Help tools 5441 inline BOOL os::Kernel32Dll::HelpToolsAvailable() { 5442 return true; 5443 } 5444 5445 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5446 DWORD th32ProcessId) { 5447 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5448 } 5449 5450 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot, 5451 LPMODULEENTRY32 lpme) { 5452 return ::Module32First(hSnapshot, lpme); 5453 } 5454 5455 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5456 LPMODULEENTRY32 lpme) { 5457 return ::Module32Next(hSnapshot, lpme); 5458 } 5459 5460 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5461 ::GetNativeSystemInfo(lpSystemInfo); 5462 } 5463 5464 // PSAPI API 5465 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, 5466 HMODULE *lpModule, DWORD cb, 5467 LPDWORD lpcbNeeded) { 5468 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5469 } 5470 5471 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, 5472 HMODULE hModule, 5473 LPTSTR lpFilename, 5474 DWORD nSize) { 5475 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5476 } 5477 5478 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, 5479 HMODULE hModule, 5480 LPMODULEINFO lpmodinfo, 5481 DWORD cb) { 5482 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5483 } 5484 5485 inline BOOL os::PSApiDll::PSApiAvailable() { 5486 return true; 5487 } 5488 5489 5490 // WinSock2 API 5491 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, 5492 LPWSADATA lpWSAData) { 5493 return ::WSAStartup(wVersionRequested, lpWSAData); 5494 } 5495 5496 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5497 return ::gethostbyname(name); 5498 } 5499 5500 inline BOOL os::WinSock2Dll::WinSock2Available() { 5501 return true; 5502 } 5503 5504 // Advapi API 5505 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5506 BOOL DisableAllPrivileges, 5507 PTOKEN_PRIVILEGES NewState, 5508 DWORD BufferLength, 5509 PTOKEN_PRIVILEGES PreviousState, 5510 PDWORD ReturnLength) { 5511 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5512 BufferLength, PreviousState, ReturnLength); 5513 } 5514 5515 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5516 DWORD DesiredAccess, 5517 PHANDLE TokenHandle) { 5518 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5519 } 5520 5521 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5522 LPCTSTR lpName, 5523 PLUID lpLuid) { 5524 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5525 } 5526 5527 inline BOOL os::Advapi32Dll::AdvapiAvailable() { 5528 return true; 5529 } 5530 5531 void* os::get_default_process_handle() { 5532 return (void*)GetModuleHandle(NULL); 5533 } 5534 5535 // Builds a platform dependent Agent_OnLoad_<lib_name> function name 5536 // which is used to find statically linked in agents. 5537 // Additionally for windows, takes into account __stdcall names. 5538 // Parameters: 5539 // sym_name: Symbol in library we are looking for 5540 // lib_name: Name of library to look in, NULL for shared libs. 5541 // is_absolute_path == true if lib_name is absolute path to agent 5542 // such as "C:/a/b/L.dll" 5543 // == false if only the base name of the library is passed in 5544 // such as "L" 5545 char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 5546 bool is_absolute_path) { 5547 char *agent_entry_name; 5548 size_t len; 5549 size_t name_len; 5550 size_t prefix_len = strlen(JNI_LIB_PREFIX); 5551 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 5552 const char *start; 5553 5554 if (lib_name != NULL) { 5555 len = name_len = strlen(lib_name); 5556 if (is_absolute_path) { 5557 // Need to strip path, prefix and suffix 5558 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 5559 lib_name = ++start; 5560 } else { 5561 // Need to check for drive prefix 5562 if ((start = strchr(lib_name, ':')) != NULL) { 5563 lib_name = ++start; 5564 } 5565 } 5566 if (len <= (prefix_len + suffix_len)) { 5567 return NULL; 5568 } 5569 lib_name += prefix_len; 5570 name_len = strlen(lib_name) - suffix_len; 5571 } 5572 } 5573 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 5574 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 5575 if (agent_entry_name == NULL) { 5576 return NULL; 5577 } 5578 if (lib_name != NULL) { 5579 const char *p = strrchr(sym_name, '@'); 5580 if (p != NULL && p != sym_name) { 5581 // sym_name == _Agent_OnLoad@XX 5582 strncpy(agent_entry_name, sym_name, (p - sym_name)); 5583 agent_entry_name[(p-sym_name)] = '\0'; 5584 // agent_entry_name == _Agent_OnLoad 5585 strcat(agent_entry_name, "_"); 5586 strncat(agent_entry_name, lib_name, name_len); 5587 strcat(agent_entry_name, p); 5588 // agent_entry_name == _Agent_OnLoad_lib_name@XX 5589 } else { 5590 strcpy(agent_entry_name, sym_name); 5591 strcat(agent_entry_name, "_"); 5592 strncat(agent_entry_name, lib_name, name_len); 5593 } 5594 } else { 5595 strcpy(agent_entry_name, sym_name); 5596 } 5597 return agent_entry_name; 5598 } 5599 5600 #else 5601 // Kernel32 API 5602 typedef BOOL (WINAPI* SwitchToThread_Fn)(void); 5603 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD); 5604 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32); 5605 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32); 5606 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO); 5607 5608 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL; 5609 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL; 5610 Module32First_Fn os::Kernel32Dll::_Module32First = NULL; 5611 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL; 5612 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL; 5613 5614 void os::Kernel32Dll::initialize() { 5615 if (!initialized) { 5616 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5617 assert(handle != NULL, "Just check"); 5618 5619 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread"); 5620 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn) 5621 ::GetProcAddress(handle, "CreateToolhelp32Snapshot"); 5622 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First"); 5623 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next"); 5624 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo"); 5625 initializeCommon(); // resolve the functions that always need resolving 5626 5627 initialized = TRUE; 5628 } 5629 } 5630 5631 BOOL os::Kernel32Dll::SwitchToThread() { 5632 assert(initialized && _SwitchToThread != NULL, 5633 "SwitchToThreadAvailable() not yet called"); 5634 return _SwitchToThread(); 5635 } 5636 5637 5638 BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5639 if (!initialized) { 5640 initialize(); 5641 } 5642 return _SwitchToThread != NULL; 5643 } 5644 5645 // Help tools 5646 BOOL os::Kernel32Dll::HelpToolsAvailable() { 5647 if (!initialized) { 5648 initialize(); 5649 } 5650 return _CreateToolhelp32Snapshot != NULL && 5651 _Module32First != NULL && 5652 _Module32Next != NULL; 5653 } 5654 5655 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5656 DWORD th32ProcessId) { 5657 assert(initialized && _CreateToolhelp32Snapshot != NULL, 5658 "HelpToolsAvailable() not yet called"); 5659 5660 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5661 } 5662 5663 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5664 assert(initialized && _Module32First != NULL, 5665 "HelpToolsAvailable() not yet called"); 5666 5667 return _Module32First(hSnapshot, lpme); 5668 } 5669 5670 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5671 LPMODULEENTRY32 lpme) { 5672 assert(initialized && _Module32Next != NULL, 5673 "HelpToolsAvailable() not yet called"); 5674 5675 return _Module32Next(hSnapshot, lpme); 5676 } 5677 5678 5679 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() { 5680 if (!initialized) { 5681 initialize(); 5682 } 5683 return _GetNativeSystemInfo != NULL; 5684 } 5685 5686 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5687 assert(initialized && _GetNativeSystemInfo != NULL, 5688 "GetNativeSystemInfoAvailable() not yet called"); 5689 5690 _GetNativeSystemInfo(lpSystemInfo); 5691 } 5692 5693 // PSAPI API 5694 5695 5696 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD); 5697 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD); 5698 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD); 5699 5700 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL; 5701 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL; 5702 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL; 5703 BOOL os::PSApiDll::initialized = FALSE; 5704 5705 void os::PSApiDll::initialize() { 5706 if (!initialized) { 5707 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0); 5708 if (handle != NULL) { 5709 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle, 5710 "EnumProcessModules"); 5711 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle, 5712 "GetModuleFileNameExA"); 5713 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle, 5714 "GetModuleInformation"); 5715 } 5716 initialized = TRUE; 5717 } 5718 } 5719 5720 5721 5722 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, 5723 DWORD cb, LPDWORD lpcbNeeded) { 5724 assert(initialized && _EnumProcessModules != NULL, 5725 "PSApiAvailable() not yet called"); 5726 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5727 } 5728 5729 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, 5730 LPTSTR lpFilename, DWORD nSize) { 5731 assert(initialized && _GetModuleFileNameEx != NULL, 5732 "PSApiAvailable() not yet called"); 5733 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5734 } 5735 5736 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, 5737 LPMODULEINFO lpmodinfo, DWORD cb) { 5738 assert(initialized && _GetModuleInformation != NULL, 5739 "PSApiAvailable() not yet called"); 5740 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5741 } 5742 5743 BOOL os::PSApiDll::PSApiAvailable() { 5744 if (!initialized) { 5745 initialize(); 5746 } 5747 return _EnumProcessModules != NULL && 5748 _GetModuleFileNameEx != NULL && 5749 _GetModuleInformation != NULL; 5750 } 5751 5752 5753 // WinSock2 API 5754 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA); 5755 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...); 5756 5757 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL; 5758 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL; 5759 BOOL os::WinSock2Dll::initialized = FALSE; 5760 5761 void os::WinSock2Dll::initialize() { 5762 if (!initialized) { 5763 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0); 5764 if (handle != NULL) { 5765 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup"); 5766 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname"); 5767 } 5768 initialized = TRUE; 5769 } 5770 } 5771 5772 5773 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) { 5774 assert(initialized && _WSAStartup != NULL, 5775 "WinSock2Available() not yet called"); 5776 return _WSAStartup(wVersionRequested, lpWSAData); 5777 } 5778 5779 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5780 assert(initialized && _gethostbyname != NULL, 5781 "WinSock2Available() not yet called"); 5782 return _gethostbyname(name); 5783 } 5784 5785 BOOL os::WinSock2Dll::WinSock2Available() { 5786 if (!initialized) { 5787 initialize(); 5788 } 5789 return _WSAStartup != NULL && 5790 _gethostbyname != NULL; 5791 } 5792 5793 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 5794 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE); 5795 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID); 5796 5797 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL; 5798 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL; 5799 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL; 5800 BOOL os::Advapi32Dll::initialized = FALSE; 5801 5802 void os::Advapi32Dll::initialize() { 5803 if (!initialized) { 5804 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0); 5805 if (handle != NULL) { 5806 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle, 5807 "AdjustTokenPrivileges"); 5808 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle, 5809 "OpenProcessToken"); 5810 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle, 5811 "LookupPrivilegeValueA"); 5812 } 5813 initialized = TRUE; 5814 } 5815 } 5816 5817 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5818 BOOL DisableAllPrivileges, 5819 PTOKEN_PRIVILEGES NewState, 5820 DWORD BufferLength, 5821 PTOKEN_PRIVILEGES PreviousState, 5822 PDWORD ReturnLength) { 5823 assert(initialized && _AdjustTokenPrivileges != NULL, 5824 "AdvapiAvailable() not yet called"); 5825 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5826 BufferLength, PreviousState, ReturnLength); 5827 } 5828 5829 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5830 DWORD DesiredAccess, 5831 PHANDLE TokenHandle) { 5832 assert(initialized && _OpenProcessToken != NULL, 5833 "AdvapiAvailable() not yet called"); 5834 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5835 } 5836 5837 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5838 LPCTSTR lpName, PLUID lpLuid) { 5839 assert(initialized && _LookupPrivilegeValue != NULL, 5840 "AdvapiAvailable() not yet called"); 5841 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5842 } 5843 5844 BOOL os::Advapi32Dll::AdvapiAvailable() { 5845 if (!initialized) { 5846 initialize(); 5847 } 5848 return _AdjustTokenPrivileges != NULL && 5849 _OpenProcessToken != NULL && 5850 _LookupPrivilegeValue != NULL; 5851 } 5852 5853 #endif 5854 5855 #ifndef PRODUCT 5856 5857 // test the code path in reserve_memory_special() that tries to allocate memory in a single 5858 // contiguous memory block at a particular address. 5859 // The test first tries to find a good approximate address to allocate at by using the same 5860 // method to allocate some memory at any address. The test then tries to allocate memory in 5861 // the vicinity (not directly after it to avoid possible by-chance use of that location) 5862 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of 5863 // the previously allocated memory is available for allocation. The only actual failure 5864 // that is reported is when the test tries to allocate at a particular location but gets a 5865 // different valid one. A NULL return value at this point is not considered an error but may 5866 // be legitimate. 5867 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages. 5868 void TestReserveMemorySpecial_test() { 5869 if (!UseLargePages) { 5870 if (VerboseInternalVMTests) { 5871 gclog_or_tty->print("Skipping test because large pages are disabled"); 5872 } 5873 return; 5874 } 5875 // save current value of globals 5876 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; 5877 bool old_use_numa_interleaving = UseNUMAInterleaving; 5878 5879 // set globals to make sure we hit the correct code path 5880 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; 5881 5882 // do an allocation at an address selected by the OS to get a good one. 5883 const size_t large_allocation_size = os::large_page_size() * 4; 5884 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); 5885 if (result == NULL) { 5886 if (VerboseInternalVMTests) { 5887 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.", 5888 large_allocation_size); 5889 } 5890 } else { 5891 os::release_memory_special(result, large_allocation_size); 5892 5893 // allocate another page within the recently allocated memory area which seems to be a good location. At least 5894 // we managed to get it once. 5895 const size_t expected_allocation_size = os::large_page_size(); 5896 char* expected_location = result + os::large_page_size(); 5897 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); 5898 if (actual_location == NULL) { 5899 if (VerboseInternalVMTests) { 5900 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.", 5901 expected_location, large_allocation_size); 5902 } 5903 } else { 5904 // release memory 5905 os::release_memory_special(actual_location, expected_allocation_size); 5906 // only now check, after releasing any memory to avoid any leaks. 5907 assert(actual_location == expected_location, 5908 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead", 5909 expected_location, expected_allocation_size, actual_location)); 5910 } 5911 } 5912 5913 // restore globals 5914 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; 5915 UseNUMAInterleaving = old_use_numa_interleaving; 5916 } 5917 #endif // PRODUCT