1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce 26 #define _WIN32_WINNT 0x0600 27 28 // no precompiled headers 29 #include "classfile/classLoader.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "code/icBuffer.hpp" 33 #include "code/vtableStubs.hpp" 34 #include "compiler/compileBroker.hpp" 35 #include "compiler/disassembler.hpp" 36 #include "interpreter/interpreter.hpp" 37 #include "jvm_windows.h" 38 #include "memory/allocation.inline.hpp" 39 #include "memory/filemap.hpp" 40 #include "mutex_windows.inline.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "os_share_windows.hpp" 43 #include "os_windows.inline.hpp" 44 #include "prims/jniFastGetField.hpp" 45 #include "prims/jvm.h" 46 #include "prims/jvm_misc.hpp" 47 #include "runtime/arguments.hpp" 48 #include "runtime/atomic.inline.hpp" 49 #include "runtime/extendedPC.hpp" 50 #include "runtime/globals.hpp" 51 #include "runtime/interfaceSupport.hpp" 52 #include "runtime/java.hpp" 53 #include "runtime/javaCalls.hpp" 54 #include "runtime/mutexLocker.hpp" 55 #include "runtime/objectMonitor.hpp" 56 #include "runtime/orderAccess.inline.hpp" 57 #include "runtime/osThread.hpp" 58 #include "runtime/perfMemory.hpp" 59 #include "runtime/sharedRuntime.hpp" 60 #include "runtime/statSampler.hpp" 61 #include "runtime/stubRoutines.hpp" 62 #include "runtime/thread.inline.hpp" 63 #include "runtime/threadCritical.hpp" 64 #include "runtime/timer.hpp" 65 #include "runtime/vm_version.hpp" 66 #include "services/attachListener.hpp" 67 #include "services/memTracker.hpp" 68 #include "services/runtimeService.hpp" 69 #include "utilities/decoder.hpp" 70 #include "utilities/defaultStream.hpp" 71 #include "utilities/events.hpp" 72 #include "utilities/growableArray.hpp" 73 #include "utilities/vmError.hpp" 74 75 #ifdef _DEBUG 76 #include <crtdbg.h> 77 #endif 78 79 80 #include <windows.h> 81 #include <sys/types.h> 82 #include <sys/stat.h> 83 #include <sys/timeb.h> 84 #include <objidl.h> 85 #include <shlobj.h> 86 87 #include <malloc.h> 88 #include <signal.h> 89 #include <direct.h> 90 #include <errno.h> 91 #include <fcntl.h> 92 #include <io.h> 93 #include <process.h> // For _beginthreadex(), _endthreadex() 94 #include <imagehlp.h> // For os::dll_address_to_function_name 95 // for enumerating dll libraries 96 #include <vdmdbg.h> 97 98 // for timer info max values which include all bits 99 #define ALL_64_BITS CONST64(-1) 100 101 // For DLL loading/load error detection 102 // Values of PE COFF 103 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c 104 #define IMAGE_FILE_SIGNATURE_LENGTH 4 105 106 static HANDLE main_process; 107 static HANDLE main_thread; 108 static int main_thread_id; 109 110 static FILETIME process_creation_time; 111 static FILETIME process_exit_time; 112 static FILETIME process_user_time; 113 static FILETIME process_kernel_time; 114 115 #ifdef _M_IA64 116 #define __CPU__ ia64 117 #elif _M_AMD64 118 #define __CPU__ amd64 119 #else 120 #define __CPU__ i486 121 #endif 122 123 // save DLL module handle, used by GetModuleFileName 124 125 HINSTANCE vm_lib_handle; 126 127 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { 128 switch (reason) { 129 case DLL_PROCESS_ATTACH: 130 vm_lib_handle = hinst; 131 if (ForceTimeHighResolution) { 132 timeBeginPeriod(1L); 133 } 134 break; 135 case DLL_PROCESS_DETACH: 136 if (ForceTimeHighResolution) { 137 timeEndPeriod(1L); 138 } 139 break; 140 default: 141 break; 142 } 143 return true; 144 } 145 146 static inline double fileTimeAsDouble(FILETIME* time) { 147 const double high = (double) ((unsigned int) ~0); 148 const double split = 10000000.0; 149 double result = (time->dwLowDateTime / split) + 150 time->dwHighDateTime * (high/split); 151 return result; 152 } 153 154 // Implementation of os 155 156 bool os::getenv(const char* name, char* buffer, int len) { 157 int result = GetEnvironmentVariable(name, buffer, len); 158 return result > 0 && result < len; 159 } 160 161 bool os::unsetenv(const char* name) { 162 assert(name != NULL, "Null pointer"); 163 return (SetEnvironmentVariable(name, NULL) == TRUE); 164 } 165 166 // No setuid programs under Windows. 167 bool os::have_special_privileges() { 168 return false; 169 } 170 171 172 // This method is a periodic task to check for misbehaving JNI applications 173 // under CheckJNI, we can add any periodic checks here. 174 // For Windows at the moment does nothing 175 void os::run_periodic_checks() { 176 return; 177 } 178 179 // previous UnhandledExceptionFilter, if there is one 180 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL; 181 182 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 183 184 void os::init_system_properties_values() { 185 // sysclasspath, java_home, dll_dir 186 { 187 char *home_path; 188 char *dll_path; 189 char *pslash; 190 char *bin = "\\bin"; 191 char home_dir[MAX_PATH]; 192 193 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) { 194 os::jvm_path(home_dir, sizeof(home_dir)); 195 // Found the full path to jvm.dll. 196 // Now cut the path to <java_home>/jre if we can. 197 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll 198 pslash = strrchr(home_dir, '\\'); 199 if (pslash != NULL) { 200 *pslash = '\0'; // get rid of \{client|server} 201 pslash = strrchr(home_dir, '\\'); 202 if (pslash != NULL) { 203 *pslash = '\0'; // get rid of \bin 204 } 205 } 206 } 207 208 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal); 209 if (home_path == NULL) { 210 return; 211 } 212 strcpy(home_path, home_dir); 213 Arguments::set_java_home(home_path); 214 FREE_C_HEAP_ARRAY(char, home_path); 215 216 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, 217 mtInternal); 218 if (dll_path == NULL) { 219 return; 220 } 221 strcpy(dll_path, home_dir); 222 strcat(dll_path, bin); 223 Arguments::set_dll_dir(dll_path); 224 FREE_C_HEAP_ARRAY(char, dll_path); 225 226 if (!set_boot_path('\\', ';')) { 227 return; 228 } 229 } 230 231 // library_path 232 #define EXT_DIR "\\lib\\ext" 233 #define BIN_DIR "\\bin" 234 #define PACKAGE_DIR "\\Sun\\Java" 235 { 236 // Win32 library search order (See the documentation for LoadLibrary): 237 // 238 // 1. The directory from which application is loaded. 239 // 2. The system wide Java Extensions directory (Java only) 240 // 3. System directory (GetSystemDirectory) 241 // 4. Windows directory (GetWindowsDirectory) 242 // 5. The PATH environment variable 243 // 6. The current directory 244 245 char *library_path; 246 char tmp[MAX_PATH]; 247 char *path_str = ::getenv("PATH"); 248 249 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 250 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal); 251 252 library_path[0] = '\0'; 253 254 GetModuleFileName(NULL, tmp, sizeof(tmp)); 255 *(strrchr(tmp, '\\')) = '\0'; 256 strcat(library_path, tmp); 257 258 GetWindowsDirectory(tmp, sizeof(tmp)); 259 strcat(library_path, ";"); 260 strcat(library_path, tmp); 261 strcat(library_path, PACKAGE_DIR BIN_DIR); 262 263 GetSystemDirectory(tmp, sizeof(tmp)); 264 strcat(library_path, ";"); 265 strcat(library_path, tmp); 266 267 GetWindowsDirectory(tmp, sizeof(tmp)); 268 strcat(library_path, ";"); 269 strcat(library_path, tmp); 270 271 if (path_str) { 272 strcat(library_path, ";"); 273 strcat(library_path, path_str); 274 } 275 276 strcat(library_path, ";."); 277 278 Arguments::set_library_path(library_path); 279 FREE_C_HEAP_ARRAY(char, library_path); 280 } 281 282 // Default extensions directory 283 { 284 char path[MAX_PATH]; 285 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 286 GetWindowsDirectory(path, MAX_PATH); 287 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 288 path, PACKAGE_DIR, EXT_DIR); 289 Arguments::set_ext_dirs(buf); 290 } 291 #undef EXT_DIR 292 #undef BIN_DIR 293 #undef PACKAGE_DIR 294 295 #ifndef _WIN64 296 // set our UnhandledExceptionFilter and save any previous one 297 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception); 298 #endif 299 300 // Done 301 return; 302 } 303 304 void os::breakpoint() { 305 DebugBreak(); 306 } 307 308 // Invoked from the BREAKPOINT Macro 309 extern "C" void breakpoint() { 310 os::breakpoint(); 311 } 312 313 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP. 314 // So far, this method is only used by Native Memory Tracking, which is 315 // only supported on Windows XP or later. 316 // 317 int os::get_native_stack(address* stack, int frames, int toSkip) { 318 #ifdef _NMT_NOINLINE_ 319 toSkip++; 320 #endif 321 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames, 322 (PVOID*)stack, NULL); 323 for (int index = captured; index < frames; index ++) { 324 stack[index] = NULL; 325 } 326 return captured; 327 } 328 329 330 // os::current_stack_base() 331 // 332 // Returns the base of the stack, which is the stack's 333 // starting address. This function must be called 334 // while running on the stack of the thread being queried. 335 336 address os::current_stack_base() { 337 MEMORY_BASIC_INFORMATION minfo; 338 address stack_bottom; 339 size_t stack_size; 340 341 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 342 stack_bottom = (address)minfo.AllocationBase; 343 stack_size = minfo.RegionSize; 344 345 // Add up the sizes of all the regions with the same 346 // AllocationBase. 347 while (1) { 348 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 349 if (stack_bottom == (address)minfo.AllocationBase) { 350 stack_size += minfo.RegionSize; 351 } else { 352 break; 353 } 354 } 355 356 #ifdef _M_IA64 357 // IA64 has memory and register stacks 358 // 359 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit 360 // at thread creation (1MB backing store growing upwards, 1MB memory stack 361 // growing downwards, 2MB summed up) 362 // 363 // ... 364 // ------- top of stack (high address) ----- 365 // | 366 // | 1MB 367 // | Backing Store (Register Stack) 368 // | 369 // | / \ 370 // | | 371 // | | 372 // | | 373 // ------------------------ stack base ----- 374 // | 1MB 375 // | Memory Stack 376 // | 377 // | | 378 // | | 379 // | | 380 // | \ / 381 // | 382 // ----- bottom of stack (low address) ----- 383 // ... 384 385 stack_size = stack_size / 2; 386 #endif 387 return stack_bottom + stack_size; 388 } 389 390 size_t os::current_stack_size() { 391 size_t sz; 392 MEMORY_BASIC_INFORMATION minfo; 393 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 394 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 395 return sz; 396 } 397 398 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 399 const struct tm* time_struct_ptr = localtime(clock); 400 if (time_struct_ptr != NULL) { 401 *res = *time_struct_ptr; 402 return res; 403 } 404 return NULL; 405 } 406 407 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 408 409 // Thread start routine for all new Java threads 410 static unsigned __stdcall java_start(Thread* thread) { 411 // Try to randomize the cache line index of hot stack frames. 412 // This helps when threads of the same stack traces evict each other's 413 // cache lines. The threads can be either from the same JVM instance, or 414 // from different JVM instances. The benefit is especially true for 415 // processors with hyperthreading technology. 416 static int counter = 0; 417 int pid = os::current_process_id(); 418 _alloca(((pid ^ counter++) & 7) * 128); 419 420 OSThread* osthr = thread->osthread(); 421 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 422 423 if (UseNUMA) { 424 int lgrp_id = os::numa_get_group_id(); 425 if (lgrp_id != -1) { 426 thread->set_lgrp_id(lgrp_id); 427 } 428 } 429 430 // Diagnostic code to investigate JDK-6573254 431 int res = 30115; // non-java thread 432 if (thread->is_Java_thread()) { 433 res = 20115; // java thread 434 } 435 436 // Install a win32 structured exception handler around every thread created 437 // by VM, so VM can generate error dump when an exception occurred in non- 438 // Java thread (e.g. VM thread). 439 __try { 440 thread->run(); 441 } __except(topLevelExceptionFilter( 442 (_EXCEPTION_POINTERS*)_exception_info())) { 443 // Nothing to do. 444 } 445 446 // One less thread is executing 447 // When the VMThread gets here, the main thread may have already exited 448 // which frees the CodeHeap containing the Atomic::add code 449 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 450 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); 451 } 452 453 // Thread must not return from exit_process_or_thread(), but if it does, 454 // let it proceed to exit normally 455 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res); 456 } 457 458 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, 459 int thread_id) { 460 // Allocate the OSThread object 461 OSThread* osthread = new OSThread(NULL, NULL); 462 if (osthread == NULL) return NULL; 463 464 // Initialize support for Java interrupts 465 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 466 if (interrupt_event == NULL) { 467 delete osthread; 468 return NULL; 469 } 470 osthread->set_interrupt_event(interrupt_event); 471 472 // Store info on the Win32 thread into the OSThread 473 osthread->set_thread_handle(thread_handle); 474 osthread->set_thread_id(thread_id); 475 476 if (UseNUMA) { 477 int lgrp_id = os::numa_get_group_id(); 478 if (lgrp_id != -1) { 479 thread->set_lgrp_id(lgrp_id); 480 } 481 } 482 483 // Initial thread state is INITIALIZED, not SUSPENDED 484 osthread->set_state(INITIALIZED); 485 486 return osthread; 487 } 488 489 490 bool os::create_attached_thread(JavaThread* thread) { 491 #ifdef ASSERT 492 thread->verify_not_published(); 493 #endif 494 HANDLE thread_h; 495 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 496 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 497 fatal("DuplicateHandle failed\n"); 498 } 499 OSThread* osthread = create_os_thread(thread, thread_h, 500 (int)current_thread_id()); 501 if (osthread == NULL) { 502 return false; 503 } 504 505 // Initial thread state is RUNNABLE 506 osthread->set_state(RUNNABLE); 507 508 thread->set_osthread(osthread); 509 return true; 510 } 511 512 bool os::create_main_thread(JavaThread* thread) { 513 #ifdef ASSERT 514 thread->verify_not_published(); 515 #endif 516 if (_starting_thread == NULL) { 517 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 518 if (_starting_thread == NULL) { 519 return false; 520 } 521 } 522 523 // The primordial thread is runnable from the start) 524 _starting_thread->set_state(RUNNABLE); 525 526 thread->set_osthread(_starting_thread); 527 return true; 528 } 529 530 // Allocate and initialize a new OSThread 531 bool os::create_thread(Thread* thread, ThreadType thr_type, 532 size_t stack_size) { 533 unsigned thread_id; 534 535 // Allocate the OSThread object 536 OSThread* osthread = new OSThread(NULL, NULL); 537 if (osthread == NULL) { 538 return false; 539 } 540 541 // Initialize support for Java interrupts 542 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 543 if (interrupt_event == NULL) { 544 delete osthread; 545 return NULL; 546 } 547 osthread->set_interrupt_event(interrupt_event); 548 osthread->set_interrupted(false); 549 550 thread->set_osthread(osthread); 551 552 if (stack_size == 0) { 553 switch (thr_type) { 554 case os::java_thread: 555 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 556 if (JavaThread::stack_size_at_create() > 0) { 557 stack_size = JavaThread::stack_size_at_create(); 558 } 559 break; 560 case os::compiler_thread: 561 if (CompilerThreadStackSize > 0) { 562 stack_size = (size_t)(CompilerThreadStackSize * K); 563 break; 564 } // else fall through: 565 // use VMThreadStackSize if CompilerThreadStackSize is not defined 566 case os::vm_thread: 567 case os::pgc_thread: 568 case os::cgc_thread: 569 case os::watcher_thread: 570 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 571 break; 572 } 573 } 574 575 // Create the Win32 thread 576 // 577 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 578 // does not specify stack size. Instead, it specifies the size of 579 // initially committed space. The stack size is determined by 580 // PE header in the executable. If the committed "stack_size" is larger 581 // than default value in the PE header, the stack is rounded up to the 582 // nearest multiple of 1MB. For example if the launcher has default 583 // stack size of 320k, specifying any size less than 320k does not 584 // affect the actual stack size at all, it only affects the initial 585 // commitment. On the other hand, specifying 'stack_size' larger than 586 // default value may cause significant increase in memory usage, because 587 // not only the stack space will be rounded up to MB, but also the 588 // entire space is committed upfront. 589 // 590 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 591 // for CreateThread() that can treat 'stack_size' as stack size. However we 592 // are not supposed to call CreateThread() directly according to MSDN 593 // document because JVM uses C runtime library. The good news is that the 594 // flag appears to work with _beginthredex() as well. 595 596 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION 597 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000) 598 #endif 599 600 HANDLE thread_handle = 601 (HANDLE)_beginthreadex(NULL, 602 (unsigned)stack_size, 603 (unsigned (__stdcall *)(void*)) java_start, 604 thread, 605 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, 606 &thread_id); 607 if (thread_handle == NULL) { 608 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again 609 // without the flag. 610 thread_handle = 611 (HANDLE)_beginthreadex(NULL, 612 (unsigned)stack_size, 613 (unsigned (__stdcall *)(void*)) java_start, 614 thread, 615 CREATE_SUSPENDED, 616 &thread_id); 617 } 618 if (thread_handle == NULL) { 619 // Need to clean up stuff we've allocated so far 620 CloseHandle(osthread->interrupt_event()); 621 thread->set_osthread(NULL); 622 delete osthread; 623 return NULL; 624 } 625 626 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); 627 628 // Store info on the Win32 thread into the OSThread 629 osthread->set_thread_handle(thread_handle); 630 osthread->set_thread_id(thread_id); 631 632 // Initial thread state is INITIALIZED, not SUSPENDED 633 osthread->set_state(INITIALIZED); 634 635 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 636 return true; 637 } 638 639 640 // Free Win32 resources related to the OSThread 641 void os::free_thread(OSThread* osthread) { 642 assert(osthread != NULL, "osthread not set"); 643 CloseHandle(osthread->thread_handle()); 644 CloseHandle(osthread->interrupt_event()); 645 delete osthread; 646 } 647 648 static jlong first_filetime; 649 static jlong initial_performance_count; 650 static jlong performance_frequency; 651 652 653 jlong as_long(LARGE_INTEGER x) { 654 jlong result = 0; // initialization to avoid warning 655 set_high(&result, x.HighPart); 656 set_low(&result, x.LowPart); 657 return result; 658 } 659 660 661 jlong os::elapsed_counter() { 662 LARGE_INTEGER count; 663 if (win32::_has_performance_count) { 664 QueryPerformanceCounter(&count); 665 return as_long(count) - initial_performance_count; 666 } else { 667 FILETIME wt; 668 GetSystemTimeAsFileTime(&wt); 669 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime); 670 } 671 } 672 673 674 jlong os::elapsed_frequency() { 675 if (win32::_has_performance_count) { 676 return performance_frequency; 677 } else { 678 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601. 679 return 10000000; 680 } 681 } 682 683 684 julong os::available_memory() { 685 return win32::available_memory(); 686 } 687 688 julong os::win32::available_memory() { 689 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 690 // value if total memory is larger than 4GB 691 MEMORYSTATUSEX ms; 692 ms.dwLength = sizeof(ms); 693 GlobalMemoryStatusEx(&ms); 694 695 return (julong)ms.ullAvailPhys; 696 } 697 698 julong os::physical_memory() { 699 return win32::physical_memory(); 700 } 701 702 bool os::has_allocatable_memory_limit(julong* limit) { 703 MEMORYSTATUSEX ms; 704 ms.dwLength = sizeof(ms); 705 GlobalMemoryStatusEx(&ms); 706 #ifdef _LP64 707 *limit = (julong)ms.ullAvailVirtual; 708 return true; 709 #else 710 // Limit to 1400m because of the 2gb address space wall 711 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual); 712 return true; 713 #endif 714 } 715 716 // VC6 lacks DWORD_PTR 717 #if _MSC_VER < 1300 718 typedef UINT_PTR DWORD_PTR; 719 #endif 720 721 int os::active_processor_count() { 722 DWORD_PTR lpProcessAffinityMask = 0; 723 DWORD_PTR lpSystemAffinityMask = 0; 724 int proc_count = processor_count(); 725 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 726 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 727 // Nof active processors is number of bits in process affinity mask 728 int bitcount = 0; 729 while (lpProcessAffinityMask != 0) { 730 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 731 bitcount++; 732 } 733 return bitcount; 734 } else { 735 return proc_count; 736 } 737 } 738 739 void os::set_native_thread_name(const char *name) { 740 741 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx 742 // 743 // Note that unfortunately this only works if the process 744 // is already attached to a debugger; debugger must observe 745 // the exception below to show the correct name. 746 747 const DWORD MS_VC_EXCEPTION = 0x406D1388; 748 struct { 749 DWORD dwType; // must be 0x1000 750 LPCSTR szName; // pointer to name (in user addr space) 751 DWORD dwThreadID; // thread ID (-1=caller thread) 752 DWORD dwFlags; // reserved for future use, must be zero 753 } info; 754 755 info.dwType = 0x1000; 756 info.szName = name; 757 info.dwThreadID = -1; 758 info.dwFlags = 0; 759 760 __try { 761 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info ); 762 } __except(EXCEPTION_CONTINUE_EXECUTION) {} 763 } 764 765 bool os::distribute_processes(uint length, uint* distribution) { 766 // Not yet implemented. 767 return false; 768 } 769 770 bool os::bind_to_processor(uint processor_id) { 771 // Not yet implemented. 772 return false; 773 } 774 775 void os::win32::initialize_performance_counter() { 776 LARGE_INTEGER count; 777 if (QueryPerformanceFrequency(&count)) { 778 win32::_has_performance_count = 1; 779 performance_frequency = as_long(count); 780 QueryPerformanceCounter(&count); 781 initial_performance_count = as_long(count); 782 } else { 783 win32::_has_performance_count = 0; 784 FILETIME wt; 785 GetSystemTimeAsFileTime(&wt); 786 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 787 } 788 } 789 790 791 double os::elapsedTime() { 792 return (double) elapsed_counter() / (double) elapsed_frequency(); 793 } 794 795 796 // Windows format: 797 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 798 // Java format: 799 // Java standards require the number of milliseconds since 1/1/1970 800 801 // Constant offset - calculated using offset() 802 static jlong _offset = 116444736000000000; 803 // Fake time counter for reproducible results when debugging 804 static jlong fake_time = 0; 805 806 #ifdef ASSERT 807 // Just to be safe, recalculate the offset in debug mode 808 static jlong _calculated_offset = 0; 809 static int _has_calculated_offset = 0; 810 811 jlong offset() { 812 if (_has_calculated_offset) return _calculated_offset; 813 SYSTEMTIME java_origin; 814 java_origin.wYear = 1970; 815 java_origin.wMonth = 1; 816 java_origin.wDayOfWeek = 0; // ignored 817 java_origin.wDay = 1; 818 java_origin.wHour = 0; 819 java_origin.wMinute = 0; 820 java_origin.wSecond = 0; 821 java_origin.wMilliseconds = 0; 822 FILETIME jot; 823 if (!SystemTimeToFileTime(&java_origin, &jot)) { 824 fatal(err_msg("Error = %d\nWindows error", GetLastError())); 825 } 826 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 827 _has_calculated_offset = 1; 828 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 829 return _calculated_offset; 830 } 831 #else 832 jlong offset() { 833 return _offset; 834 } 835 #endif 836 837 jlong windows_to_java_time(FILETIME wt) { 838 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 839 return (a - offset()) / 10000; 840 } 841 842 // Returns time ticks in (10th of micro seconds) 843 jlong windows_to_time_ticks(FILETIME wt) { 844 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 845 return (a - offset()); 846 } 847 848 FILETIME java_to_windows_time(jlong l) { 849 jlong a = (l * 10000) + offset(); 850 FILETIME result; 851 result.dwHighDateTime = high(a); 852 result.dwLowDateTime = low(a); 853 return result; 854 } 855 856 bool os::supports_vtime() { return true; } 857 bool os::enable_vtime() { return false; } 858 bool os::vtime_enabled() { return false; } 859 860 double os::elapsedVTime() { 861 FILETIME created; 862 FILETIME exited; 863 FILETIME kernel; 864 FILETIME user; 865 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) { 866 // the resolution of windows_to_java_time() should be sufficient (ms) 867 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS; 868 } else { 869 return elapsedTime(); 870 } 871 } 872 873 jlong os::javaTimeMillis() { 874 if (UseFakeTimers) { 875 return fake_time++; 876 } else { 877 FILETIME wt; 878 GetSystemTimeAsFileTime(&wt); 879 return windows_to_java_time(wt); 880 } 881 } 882 883 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 884 FILETIME wt; 885 GetSystemTimeAsFileTime(&wt); 886 jlong ticks = windows_to_time_ticks(wt); // 10th of micros 887 jlong secs = jlong(ticks / 10000000); // 10000 * 1000 888 seconds = secs; 889 nanos = jlong(ticks - (secs*10000000)) * 100; 890 } 891 892 jlong os::javaTimeNanos() { 893 if (!win32::_has_performance_count) { 894 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do. 895 } else { 896 LARGE_INTEGER current_count; 897 QueryPerformanceCounter(¤t_count); 898 double current = as_long(current_count); 899 double freq = performance_frequency; 900 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC); 901 return time; 902 } 903 } 904 905 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 906 if (!win32::_has_performance_count) { 907 // javaTimeMillis() doesn't have much percision, 908 // but it is not going to wrap -- so all 64 bits 909 info_ptr->max_value = ALL_64_BITS; 910 911 // this is a wall clock timer, so may skip 912 info_ptr->may_skip_backward = true; 913 info_ptr->may_skip_forward = true; 914 } else { 915 jlong freq = performance_frequency; 916 if (freq < NANOSECS_PER_SEC) { 917 // the performance counter is 64 bits and we will 918 // be multiplying it -- so no wrap in 64 bits 919 info_ptr->max_value = ALL_64_BITS; 920 } else if (freq > NANOSECS_PER_SEC) { 921 // use the max value the counter can reach to 922 // determine the max value which could be returned 923 julong max_counter = (julong)ALL_64_BITS; 924 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC)); 925 } else { 926 // the performance counter is 64 bits and we will 927 // be using it directly -- so no wrap in 64 bits 928 info_ptr->max_value = ALL_64_BITS; 929 } 930 931 // using a counter, so no skipping 932 info_ptr->may_skip_backward = false; 933 info_ptr->may_skip_forward = false; 934 } 935 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 936 } 937 938 char* os::local_time_string(char *buf, size_t buflen) { 939 SYSTEMTIME st; 940 GetLocalTime(&st); 941 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 942 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 943 return buf; 944 } 945 946 bool os::getTimesSecs(double* process_real_time, 947 double* process_user_time, 948 double* process_system_time) { 949 HANDLE h_process = GetCurrentProcess(); 950 FILETIME create_time, exit_time, kernel_time, user_time; 951 BOOL result = GetProcessTimes(h_process, 952 &create_time, 953 &exit_time, 954 &kernel_time, 955 &user_time); 956 if (result != 0) { 957 FILETIME wt; 958 GetSystemTimeAsFileTime(&wt); 959 jlong rtc_millis = windows_to_java_time(wt); 960 jlong user_millis = windows_to_java_time(user_time); 961 jlong system_millis = windows_to_java_time(kernel_time); 962 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 963 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); 964 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); 965 return true; 966 } else { 967 return false; 968 } 969 } 970 971 void os::shutdown() { 972 // allow PerfMemory to attempt cleanup of any persistent resources 973 perfMemory_exit(); 974 975 // flush buffered output, finish log files 976 ostream_abort(); 977 978 // Check for abort hook 979 abort_hook_t abort_hook = Arguments::abort_hook(); 980 if (abort_hook != NULL) { 981 abort_hook(); 982 } 983 } 984 985 986 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 987 PMINIDUMP_EXCEPTION_INFORMATION, 988 PMINIDUMP_USER_STREAM_INFORMATION, 989 PMINIDUMP_CALLBACK_INFORMATION); 990 991 void os::check_dump_limit(char* buffer, size_t bufferSize) { 992 // First presume we can dump core file, detail checking done in abort() 993 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp", get_current_directory(NULL, 0), current_process_id()); 994 VMError::report_coredump_status(buffer, true); 995 } 996 997 void os::abort(bool dump_core, void* siginfo, void* context) { 998 HINSTANCE dbghelp; 999 EXCEPTION_POINTERS ep; 1000 MINIDUMP_EXCEPTION_INFORMATION mei; 1001 MINIDUMP_EXCEPTION_INFORMATION* pmei; 1002 1003 HANDLE hProcess = GetCurrentProcess(); 1004 DWORD processId = GetCurrentProcessId(); 1005 HANDLE dumpFile; 1006 MINIDUMP_TYPE dumpType; 1007 static const char* cwd; 1008 static char buffer[O_BUFLEN]; 1009 1010 os::shutdown(); 1011 if (!dump_core) return; 1012 1013 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows. 1014 #ifndef ASSERT 1015 // If running on a client version of Windows and user has not explicitly enabled dumping 1016 if (!os::win32::is_windows_server() && !CreateCoredumpOnCrash) { 1017 jio_fprintf(stderr, "Minidumps are not enabled by default on client versions of Windows.\n"); 1018 return; 1019 // If running on a server version of Windows and user has explictly disabled dumping 1020 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) { 1021 jio_fprintf(stderr, "Minidump has been disabled from the command line.\n"); 1022 return; 1023 } 1024 #else 1025 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) { 1026 jio_fprintf(stderr, "Minidump has been disabled from the command line.\n"); 1027 return; 1028 } 1029 #endif 1030 1031 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0); 1032 1033 if (dbghelp == NULL) { 1034 jio_fprintf(stderr, "Failed to load dbghelp.dll.\n"); 1035 return; 1036 } 1037 1038 _MiniDumpWriteDump = 1039 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 1040 PMINIDUMP_EXCEPTION_INFORMATION, 1041 PMINIDUMP_USER_STREAM_INFORMATION, 1042 PMINIDUMP_CALLBACK_INFORMATION), 1043 GetProcAddress(dbghelp, 1044 "MiniDumpWriteDump")); 1045 1046 if (_MiniDumpWriteDump == NULL) { 1047 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n"); 1048 return; 1049 } 1050 1051 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData); 1052 1053 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with 1054 // API_VERSION_NUMBER 11 or higher contains the ones we want though 1055 #if API_VERSION_NUMBER >= 11 1056 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | 1057 MiniDumpWithUnloadedModules); 1058 #endif 1059 1060 cwd = get_current_directory(NULL, 0); 1061 jio_snprintf(buffer, sizeof(buffer), "%s\\hs_err_pid%u.mdmp", cwd, current_process_id()); 1062 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); 1063 1064 if (dumpFile == INVALID_HANDLE_VALUE) { 1065 jio_fprintf(stderr, "Failed to create file %s for dumping.\n", buffer); 1066 return; 1067 } 1068 1069 if (siginfo != NULL && context != NULL) { 1070 ep.ContextRecord = (PCONTEXT) context; 1071 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo; 1072 1073 mei.ThreadId = GetCurrentThreadId(); 1074 mei.ExceptionPointers = &ep; 1075 pmei = &mei; 1076 } else { 1077 pmei = NULL; 1078 } 1079 1080 1081 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all 1082 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then. 1083 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false && 1084 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) { 1085 DWORD error = GetLastError(); 1086 LPTSTR msgbuf = NULL; 1087 1088 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | 1089 FORMAT_MESSAGE_FROM_SYSTEM | 1090 FORMAT_MESSAGE_IGNORE_INSERTS, 1091 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) { 1092 1093 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)\n", error, msgbuf); 1094 LocalFree(msgbuf); 1095 } else { 1096 // Call to FormatMessage failed, just include the result from GetLastError 1097 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", error); 1098 } 1099 } else { 1100 jio_fprintf(stderr, "%s.\n", buffer); 1101 } 1102 1103 CloseHandle(dumpFile); 1104 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1105 } 1106 1107 // Die immediately, no exit hook, no abort hook, no cleanup. 1108 void os::die() { 1109 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1); 1110 } 1111 1112 // Directory routines copied from src/win32/native/java/io/dirent_md.c 1113 // * dirent_md.c 1.15 00/02/02 1114 // 1115 // The declarations for DIR and struct dirent are in jvm_win32.h. 1116 1117 // Caller must have already run dirname through JVM_NativePath, which removes 1118 // duplicate slashes and converts all instances of '/' into '\\'. 1119 1120 DIR * os::opendir(const char *dirname) { 1121 assert(dirname != NULL, "just checking"); // hotspot change 1122 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal); 1123 DWORD fattr; // hotspot change 1124 char alt_dirname[4] = { 0, 0, 0, 0 }; 1125 1126 if (dirp == 0) { 1127 errno = ENOMEM; 1128 return 0; 1129 } 1130 1131 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it 1132 // as a directory in FindFirstFile(). We detect this case here and 1133 // prepend the current drive name. 1134 // 1135 if (dirname[1] == '\0' && dirname[0] == '\\') { 1136 alt_dirname[0] = _getdrive() + 'A' - 1; 1137 alt_dirname[1] = ':'; 1138 alt_dirname[2] = '\\'; 1139 alt_dirname[3] = '\0'; 1140 dirname = alt_dirname; 1141 } 1142 1143 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal); 1144 if (dirp->path == 0) { 1145 free(dirp); 1146 errno = ENOMEM; 1147 return 0; 1148 } 1149 strcpy(dirp->path, dirname); 1150 1151 fattr = GetFileAttributes(dirp->path); 1152 if (fattr == 0xffffffff) { 1153 free(dirp->path); 1154 free(dirp); 1155 errno = ENOENT; 1156 return 0; 1157 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 1158 free(dirp->path); 1159 free(dirp); 1160 errno = ENOTDIR; 1161 return 0; 1162 } 1163 1164 // Append "*.*", or possibly "\\*.*", to path 1165 if (dirp->path[1] == ':' && 1166 (dirp->path[2] == '\0' || 1167 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 1168 // No '\\' needed for cases like "Z:" or "Z:\" 1169 strcat(dirp->path, "*.*"); 1170 } else { 1171 strcat(dirp->path, "\\*.*"); 1172 } 1173 1174 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 1175 if (dirp->handle == INVALID_HANDLE_VALUE) { 1176 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 1177 free(dirp->path); 1178 free(dirp); 1179 errno = EACCES; 1180 return 0; 1181 } 1182 } 1183 return dirp; 1184 } 1185 1186 // parameter dbuf unused on Windows 1187 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) { 1188 assert(dirp != NULL, "just checking"); // hotspot change 1189 if (dirp->handle == INVALID_HANDLE_VALUE) { 1190 return 0; 1191 } 1192 1193 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 1194 1195 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 1196 if (GetLastError() == ERROR_INVALID_HANDLE) { 1197 errno = EBADF; 1198 return 0; 1199 } 1200 FindClose(dirp->handle); 1201 dirp->handle = INVALID_HANDLE_VALUE; 1202 } 1203 1204 return &dirp->dirent; 1205 } 1206 1207 int os::closedir(DIR *dirp) { 1208 assert(dirp != NULL, "just checking"); // hotspot change 1209 if (dirp->handle != INVALID_HANDLE_VALUE) { 1210 if (!FindClose(dirp->handle)) { 1211 errno = EBADF; 1212 return -1; 1213 } 1214 dirp->handle = INVALID_HANDLE_VALUE; 1215 } 1216 free(dirp->path); 1217 free(dirp); 1218 return 0; 1219 } 1220 1221 // This must be hard coded because it's the system's temporary 1222 // directory not the java application's temp directory, ala java.io.tmpdir. 1223 const char* os::get_temp_directory() { 1224 static char path_buf[MAX_PATH]; 1225 if (GetTempPath(MAX_PATH, path_buf) > 0) { 1226 return path_buf; 1227 } else { 1228 path_buf[0] = '\0'; 1229 return path_buf; 1230 } 1231 } 1232 1233 static bool file_exists(const char* filename) { 1234 if (filename == NULL || strlen(filename) == 0) { 1235 return false; 1236 } 1237 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES; 1238 } 1239 1240 bool os::dll_build_name(char *buffer, size_t buflen, 1241 const char* pname, const char* fname) { 1242 bool retval = false; 1243 const size_t pnamelen = pname ? strlen(pname) : 0; 1244 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0; 1245 1246 // Return error on buffer overflow. 1247 if (pnamelen + strlen(fname) + 10 > buflen) { 1248 return retval; 1249 } 1250 1251 if (pnamelen == 0) { 1252 jio_snprintf(buffer, buflen, "%s.dll", fname); 1253 retval = true; 1254 } else if (c == ':' || c == '\\') { 1255 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname); 1256 retval = true; 1257 } else if (strchr(pname, *os::path_separator()) != NULL) { 1258 int n; 1259 char** pelements = split_path(pname, &n); 1260 if (pelements == NULL) { 1261 return false; 1262 } 1263 for (int i = 0; i < n; i++) { 1264 char* path = pelements[i]; 1265 // Really shouldn't be NULL, but check can't hurt 1266 size_t plen = (path == NULL) ? 0 : strlen(path); 1267 if (plen == 0) { 1268 continue; // skip the empty path values 1269 } 1270 const char lastchar = path[plen - 1]; 1271 if (lastchar == ':' || lastchar == '\\') { 1272 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname); 1273 } else { 1274 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname); 1275 } 1276 if (file_exists(buffer)) { 1277 retval = true; 1278 break; 1279 } 1280 } 1281 // release the storage 1282 for (int i = 0; i < n; i++) { 1283 if (pelements[i] != NULL) { 1284 FREE_C_HEAP_ARRAY(char, pelements[i]); 1285 } 1286 } 1287 if (pelements != NULL) { 1288 FREE_C_HEAP_ARRAY(char*, pelements); 1289 } 1290 } else { 1291 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname); 1292 retval = true; 1293 } 1294 return retval; 1295 } 1296 1297 // Needs to be in os specific directory because windows requires another 1298 // header file <direct.h> 1299 const char* os::get_current_directory(char *buf, size_t buflen) { 1300 int n = static_cast<int>(buflen); 1301 if (buflen > INT_MAX) n = INT_MAX; 1302 return _getcwd(buf, n); 1303 } 1304 1305 //----------------------------------------------------------- 1306 // Helper functions for fatal error handler 1307 #ifdef _WIN64 1308 // Helper routine which returns true if address in 1309 // within the NTDLL address space. 1310 // 1311 static bool _addr_in_ntdll(address addr) { 1312 HMODULE hmod; 1313 MODULEINFO minfo; 1314 1315 hmod = GetModuleHandle("NTDLL.DLL"); 1316 if (hmod == NULL) return false; 1317 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod, 1318 &minfo, sizeof(MODULEINFO))) { 1319 return false; 1320 } 1321 1322 if ((addr >= minfo.lpBaseOfDll) && 1323 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) { 1324 return true; 1325 } else { 1326 return false; 1327 } 1328 } 1329 #endif 1330 1331 struct _modinfo { 1332 address addr; 1333 char* full_path; // point to a char buffer 1334 int buflen; // size of the buffer 1335 address base_addr; 1336 }; 1337 1338 static int _locate_module_by_addr(const char * mod_fname, address base_addr, 1339 address top_address, void * param) { 1340 struct _modinfo *pmod = (struct _modinfo *)param; 1341 if (!pmod) return -1; 1342 1343 if (base_addr <= pmod->addr && 1344 top_address > pmod->addr) { 1345 // if a buffer is provided, copy path name to the buffer 1346 if (pmod->full_path) { 1347 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1348 } 1349 pmod->base_addr = base_addr; 1350 return 1; 1351 } 1352 return 0; 1353 } 1354 1355 bool os::dll_address_to_library_name(address addr, char* buf, 1356 int buflen, int* offset) { 1357 // buf is not optional, but offset is optional 1358 assert(buf != NULL, "sanity check"); 1359 1360 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1361 // return the full path to the DLL file, sometimes it returns path 1362 // to the corresponding PDB file (debug info); sometimes it only 1363 // returns partial path, which makes life painful. 1364 1365 struct _modinfo mi; 1366 mi.addr = addr; 1367 mi.full_path = buf; 1368 mi.buflen = buflen; 1369 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) { 1370 // buf already contains path name 1371 if (offset) *offset = addr - mi.base_addr; 1372 return true; 1373 } 1374 1375 buf[0] = '\0'; 1376 if (offset) *offset = -1; 1377 return false; 1378 } 1379 1380 bool os::dll_address_to_function_name(address addr, char *buf, 1381 int buflen, int *offset) { 1382 // buf is not optional, but offset is optional 1383 assert(buf != NULL, "sanity check"); 1384 1385 if (Decoder::decode(addr, buf, buflen, offset)) { 1386 return true; 1387 } 1388 if (offset != NULL) *offset = -1; 1389 buf[0] = '\0'; 1390 return false; 1391 } 1392 1393 // save the start and end address of jvm.dll into param[0] and param[1] 1394 static int _locate_jvm_dll(const char* mod_fname, address base_addr, 1395 address top_address, void * param) { 1396 if (!param) return -1; 1397 1398 if (base_addr <= (address)_locate_jvm_dll && 1399 top_address > (address)_locate_jvm_dll) { 1400 ((address*)param)[0] = base_addr; 1401 ((address*)param)[1] = top_address; 1402 return 1; 1403 } 1404 return 0; 1405 } 1406 1407 address vm_lib_location[2]; // start and end address of jvm.dll 1408 1409 // check if addr is inside jvm.dll 1410 bool os::address_is_in_vm(address addr) { 1411 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1412 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) { 1413 assert(false, "Can't find jvm module."); 1414 return false; 1415 } 1416 } 1417 1418 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1419 } 1420 1421 // print module info; param is outputStream* 1422 static int _print_module(const char* fname, address base_address, 1423 address top_address, void* param) { 1424 if (!param) return -1; 1425 1426 outputStream* st = (outputStream*)param; 1427 1428 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname); 1429 return 0; 1430 } 1431 1432 // Loads .dll/.so and 1433 // in case of error it checks if .dll/.so was built for the 1434 // same architecture as Hotspot is running on 1435 void * os::dll_load(const char *name, char *ebuf, int ebuflen) { 1436 void * result = LoadLibrary(name); 1437 if (result != NULL) { 1438 return result; 1439 } 1440 1441 DWORD errcode = GetLastError(); 1442 if (errcode == ERROR_MOD_NOT_FOUND) { 1443 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1); 1444 ebuf[ebuflen - 1] = '\0'; 1445 return NULL; 1446 } 1447 1448 // Parsing dll below 1449 // If we can read dll-info and find that dll was built 1450 // for an architecture other than Hotspot is running in 1451 // - then print to buffer "DLL was built for a different architecture" 1452 // else call os::lasterror to obtain system error message 1453 1454 // Read system error message into ebuf 1455 // It may or may not be overwritten below (in the for loop and just above) 1456 lasterror(ebuf, (size_t) ebuflen); 1457 ebuf[ebuflen - 1] = '\0'; 1458 int fd = ::open(name, O_RDONLY | O_BINARY, 0); 1459 if (fd < 0) { 1460 return NULL; 1461 } 1462 1463 uint32_t signature_offset; 1464 uint16_t lib_arch = 0; 1465 bool failed_to_get_lib_arch = 1466 ( // Go to position 3c in the dll 1467 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0) 1468 || 1469 // Read location of signature 1470 (sizeof(signature_offset) != 1471 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset)))) 1472 || 1473 // Go to COFF File Header in dll 1474 // that is located after "signature" (4 bytes long) 1475 (os::seek_to_file_offset(fd, 1476 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0) 1477 || 1478 // Read field that contains code of architecture 1479 // that dll was built for 1480 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch)))) 1481 ); 1482 1483 ::close(fd); 1484 if (failed_to_get_lib_arch) { 1485 // file i/o error - report os::lasterror(...) msg 1486 return NULL; 1487 } 1488 1489 typedef struct { 1490 uint16_t arch_code; 1491 char* arch_name; 1492 } arch_t; 1493 1494 static const arch_t arch_array[] = { 1495 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1496 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1497 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1498 }; 1499 #if (defined _M_IA64) 1500 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64; 1501 #elif (defined _M_AMD64) 1502 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64; 1503 #elif (defined _M_IX86) 1504 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386; 1505 #else 1506 #error Method os::dll_load requires that one of following \ 1507 is defined :_M_IA64,_M_AMD64 or _M_IX86 1508 #endif 1509 1510 1511 // Obtain a string for printf operation 1512 // lib_arch_str shall contain string what platform this .dll was built for 1513 // running_arch_str shall string contain what platform Hotspot was built for 1514 char *running_arch_str = NULL, *lib_arch_str = NULL; 1515 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) { 1516 if (lib_arch == arch_array[i].arch_code) { 1517 lib_arch_str = arch_array[i].arch_name; 1518 } 1519 if (running_arch == arch_array[i].arch_code) { 1520 running_arch_str = arch_array[i].arch_name; 1521 } 1522 } 1523 1524 assert(running_arch_str, 1525 "Didn't find running architecture code in arch_array"); 1526 1527 // If the architecture is right 1528 // but some other error took place - report os::lasterror(...) msg 1529 if (lib_arch == running_arch) { 1530 return NULL; 1531 } 1532 1533 if (lib_arch_str != NULL) { 1534 ::_snprintf(ebuf, ebuflen - 1, 1535 "Can't load %s-bit .dll on a %s-bit platform", 1536 lib_arch_str, running_arch_str); 1537 } else { 1538 // don't know what architecture this dll was build for 1539 ::_snprintf(ebuf, ebuflen - 1, 1540 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1541 lib_arch, running_arch_str); 1542 } 1543 1544 return NULL; 1545 } 1546 1547 void os::print_dll_info(outputStream *st) { 1548 st->print_cr("Dynamic libraries:"); 1549 get_loaded_modules_info(_print_module, (void *)st); 1550 } 1551 1552 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1553 HANDLE hProcess; 1554 1555 # define MAX_NUM_MODULES 128 1556 HMODULE modules[MAX_NUM_MODULES]; 1557 static char filename[MAX_PATH]; 1558 int result = 0; 1559 1560 if (!os::PSApiDll::PSApiAvailable()) { 1561 return 0; 1562 } 1563 1564 int pid = os::current_process_id(); 1565 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1566 FALSE, pid); 1567 if (hProcess == NULL) return 0; 1568 1569 DWORD size_needed; 1570 if (!os::PSApiDll::EnumProcessModules(hProcess, modules, 1571 sizeof(modules), &size_needed)) { 1572 CloseHandle(hProcess); 1573 return 0; 1574 } 1575 1576 // number of modules that are currently loaded 1577 int num_modules = size_needed / sizeof(HMODULE); 1578 1579 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1580 // Get Full pathname: 1581 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i], 1582 filename, sizeof(filename))) { 1583 filename[0] = '\0'; 1584 } 1585 1586 MODULEINFO modinfo; 1587 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i], 1588 &modinfo, sizeof(modinfo))) { 1589 modinfo.lpBaseOfDll = NULL; 1590 modinfo.SizeOfImage = 0; 1591 } 1592 1593 // Invoke callback function 1594 result = callback(filename, (address)modinfo.lpBaseOfDll, 1595 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param); 1596 if (result) break; 1597 } 1598 1599 CloseHandle(hProcess); 1600 return result; 1601 } 1602 1603 void os::print_os_info_brief(outputStream* st) { 1604 os::print_os_info(st); 1605 } 1606 1607 void os::print_os_info(outputStream* st) { 1608 #ifdef ASSERT 1609 char buffer[1024]; 1610 DWORD size = sizeof(buffer); 1611 st->print(" HostName: "); 1612 if (GetComputerNameEx(ComputerNameDnsHostname, buffer, &size)) { 1613 st->print("%s", buffer); 1614 } else { 1615 st->print("N/A"); 1616 } 1617 #endif 1618 st->print(" OS:"); 1619 os::win32::print_windows_version(st); 1620 } 1621 1622 void os::win32::print_windows_version(outputStream* st) { 1623 OSVERSIONINFOEX osvi; 1624 VS_FIXEDFILEINFO *file_info; 1625 TCHAR kernel32_path[MAX_PATH]; 1626 UINT len, ret; 1627 1628 // Use the GetVersionEx information to see if we're on a server or 1629 // workstation edition of Windows. Starting with Windows 8.1 we can't 1630 // trust the OS version information returned by this API. 1631 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1632 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1633 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1634 st->print_cr("Call to GetVersionEx failed"); 1635 return; 1636 } 1637 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION); 1638 1639 // Get the full path to \Windows\System32\kernel32.dll and use that for 1640 // determining what version of Windows we're running on. 1641 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1; 1642 ret = GetSystemDirectory(kernel32_path, len); 1643 if (ret == 0 || ret > len) { 1644 st->print_cr("Call to GetSystemDirectory failed"); 1645 return; 1646 } 1647 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret); 1648 1649 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL); 1650 if (version_size == 0) { 1651 st->print_cr("Call to GetFileVersionInfoSize failed"); 1652 return; 1653 } 1654 1655 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal); 1656 if (version_info == NULL) { 1657 st->print_cr("Failed to allocate version_info"); 1658 return; 1659 } 1660 1661 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) { 1662 os::free(version_info); 1663 st->print_cr("Call to GetFileVersionInfo failed"); 1664 return; 1665 } 1666 1667 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) { 1668 os::free(version_info); 1669 st->print_cr("Call to VerQueryValue failed"); 1670 return; 1671 } 1672 1673 int major_version = HIWORD(file_info->dwProductVersionMS); 1674 int minor_version = LOWORD(file_info->dwProductVersionMS); 1675 int build_number = HIWORD(file_info->dwProductVersionLS); 1676 int build_minor = LOWORD(file_info->dwProductVersionLS); 1677 int os_vers = major_version * 1000 + minor_version; 1678 os::free(version_info); 1679 1680 st->print(" Windows "); 1681 switch (os_vers) { 1682 1683 case 6000: 1684 if (is_workstation) { 1685 st->print("Vista"); 1686 } else { 1687 st->print("Server 2008"); 1688 } 1689 break; 1690 1691 case 6001: 1692 if (is_workstation) { 1693 st->print("7"); 1694 } else { 1695 st->print("Server 2008 R2"); 1696 } 1697 break; 1698 1699 case 6002: 1700 if (is_workstation) { 1701 st->print("8"); 1702 } else { 1703 st->print("Server 2012"); 1704 } 1705 break; 1706 1707 case 6003: 1708 if (is_workstation) { 1709 st->print("8.1"); 1710 } else { 1711 st->print("Server 2012 R2"); 1712 } 1713 break; 1714 1715 case 10000: 1716 if (is_workstation) { 1717 st->print("10"); 1718 } else { 1719 // The server version name of Windows 10 is not known at this time 1720 st->print("%d.%d", major_version, minor_version); 1721 } 1722 break; 1723 1724 default: 1725 // Unrecognized windows, print out its major and minor versions 1726 st->print("%d.%d", major_version, minor_version); 1727 break; 1728 } 1729 1730 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1731 // find out whether we are running on 64 bit processor or not 1732 SYSTEM_INFO si; 1733 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1734 os::Kernel32Dll::GetNativeSystemInfo(&si); 1735 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1736 st->print(" , 64 bit"); 1737 } 1738 1739 st->print(" Build %d", build_number); 1740 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor); 1741 st->cr(); 1742 } 1743 1744 void os::pd_print_cpu_info(outputStream* st) { 1745 // Nothing to do for now. 1746 } 1747 1748 void os::print_memory_info(outputStream* st) { 1749 st->print("Memory:"); 1750 st->print(" %dk page", os::vm_page_size()>>10); 1751 1752 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1753 // value if total memory is larger than 4GB 1754 MEMORYSTATUSEX ms; 1755 ms.dwLength = sizeof(ms); 1756 GlobalMemoryStatusEx(&ms); 1757 1758 st->print(", physical %uk", os::physical_memory() >> 10); 1759 st->print("(%uk free)", os::available_memory() >> 10); 1760 1761 st->print(", swap %uk", ms.ullTotalPageFile >> 10); 1762 st->print("(%uk free)", ms.ullAvailPageFile >> 10); 1763 st->cr(); 1764 } 1765 1766 void os::print_siginfo(outputStream *st, void *siginfo) { 1767 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1768 st->print("siginfo:"); 1769 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1770 1771 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1772 er->NumberParameters >= 2) { 1773 switch (er->ExceptionInformation[0]) { 1774 case 0: st->print(", reading address"); break; 1775 case 1: st->print(", writing address"); break; 1776 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1777 er->ExceptionInformation[0]); 1778 } 1779 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1780 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1781 er->NumberParameters >= 2 && UseSharedSpaces) { 1782 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1783 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1784 st->print("\n\nError accessing class data sharing archive." \ 1785 " Mapped file inaccessible during execution, " \ 1786 " possible disk/network problem."); 1787 } 1788 } else { 1789 int num = er->NumberParameters; 1790 if (num > 0) { 1791 st->print(", ExceptionInformation="); 1792 for (int i = 0; i < num; i++) { 1793 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1794 } 1795 } 1796 } 1797 st->cr(); 1798 } 1799 1800 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1801 // do nothing 1802 } 1803 1804 static char saved_jvm_path[MAX_PATH] = {0}; 1805 1806 // Find the full path to the current module, jvm.dll 1807 void os::jvm_path(char *buf, jint buflen) { 1808 // Error checking. 1809 if (buflen < MAX_PATH) { 1810 assert(false, "must use a large-enough buffer"); 1811 buf[0] = '\0'; 1812 return; 1813 } 1814 // Lazy resolve the path to current module. 1815 if (saved_jvm_path[0] != 0) { 1816 strcpy(buf, saved_jvm_path); 1817 return; 1818 } 1819 1820 buf[0] = '\0'; 1821 if (Arguments::sun_java_launcher_is_altjvm()) { 1822 // Support for the java launcher's '-XXaltjvm=<path>' option. Check 1823 // for a JAVA_HOME environment variable and fix up the path so it 1824 // looks like jvm.dll is installed there (append a fake suffix 1825 // hotspot/jvm.dll). 1826 char* java_home_var = ::getenv("JAVA_HOME"); 1827 if (java_home_var != NULL && java_home_var[0] != 0 && 1828 strlen(java_home_var) < (size_t)buflen) { 1829 strncpy(buf, java_home_var, buflen); 1830 1831 // determine if this is a legacy image or modules image 1832 // modules image doesn't have "jre" subdirectory 1833 size_t len = strlen(buf); 1834 char* jrebin_p = buf + len; 1835 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1836 if (0 != _access(buf, 0)) { 1837 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1838 } 1839 len = strlen(buf); 1840 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1841 } 1842 } 1843 1844 if (buf[0] == '\0') { 1845 GetModuleFileName(vm_lib_handle, buf, buflen); 1846 } 1847 strncpy(saved_jvm_path, buf, MAX_PATH); 1848 saved_jvm_path[MAX_PATH - 1] = '\0'; 1849 } 1850 1851 1852 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1853 #ifndef _WIN64 1854 st->print("_"); 1855 #endif 1856 } 1857 1858 1859 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1860 #ifndef _WIN64 1861 st->print("@%d", args_size * sizeof(int)); 1862 #endif 1863 } 1864 1865 // This method is a copy of JDK's sysGetLastErrorString 1866 // from src/windows/hpi/src/system_md.c 1867 1868 size_t os::lasterror(char* buf, size_t len) { 1869 DWORD errval; 1870 1871 if ((errval = GetLastError()) != 0) { 1872 // DOS error 1873 size_t n = (size_t)FormatMessage( 1874 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1875 NULL, 1876 errval, 1877 0, 1878 buf, 1879 (DWORD)len, 1880 NULL); 1881 if (n > 3) { 1882 // Drop final '.', CR, LF 1883 if (buf[n - 1] == '\n') n--; 1884 if (buf[n - 1] == '\r') n--; 1885 if (buf[n - 1] == '.') n--; 1886 buf[n] = '\0'; 1887 } 1888 return n; 1889 } 1890 1891 if (errno != 0) { 1892 // C runtime error that has no corresponding DOS error code 1893 const char* s = strerror(errno); 1894 size_t n = strlen(s); 1895 if (n >= len) n = len - 1; 1896 strncpy(buf, s, n); 1897 buf[n] = '\0'; 1898 return n; 1899 } 1900 1901 return 0; 1902 } 1903 1904 int os::get_last_error() { 1905 DWORD error = GetLastError(); 1906 if (error == 0) { 1907 error = errno; 1908 } 1909 return (int)error; 1910 } 1911 1912 // sun.misc.Signal 1913 // NOTE that this is a workaround for an apparent kernel bug where if 1914 // a signal handler for SIGBREAK is installed then that signal handler 1915 // takes priority over the console control handler for CTRL_CLOSE_EVENT. 1916 // See bug 4416763. 1917 static void (*sigbreakHandler)(int) = NULL; 1918 1919 static void UserHandler(int sig, void *siginfo, void *context) { 1920 os::signal_notify(sig); 1921 // We need to reinstate the signal handler each time... 1922 os::signal(sig, (void*)UserHandler); 1923 } 1924 1925 void* os::user_handler() { 1926 return (void*) UserHandler; 1927 } 1928 1929 void* os::signal(int signal_number, void* handler) { 1930 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1931 void (*oldHandler)(int) = sigbreakHandler; 1932 sigbreakHandler = (void (*)(int)) handler; 1933 return (void*) oldHandler; 1934 } else { 1935 return (void*)::signal(signal_number, (void (*)(int))handler); 1936 } 1937 } 1938 1939 void os::signal_raise(int signal_number) { 1940 raise(signal_number); 1941 } 1942 1943 // The Win32 C runtime library maps all console control events other than ^C 1944 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1945 // logoff, and shutdown events. We therefore install our own console handler 1946 // that raises SIGTERM for the latter cases. 1947 // 1948 static BOOL WINAPI consoleHandler(DWORD event) { 1949 switch (event) { 1950 case CTRL_C_EVENT: 1951 if (is_error_reported()) { 1952 // Ctrl-C is pressed during error reporting, likely because the error 1953 // handler fails to abort. Let VM die immediately. 1954 os::die(); 1955 } 1956 1957 os::signal_raise(SIGINT); 1958 return TRUE; 1959 break; 1960 case CTRL_BREAK_EVENT: 1961 if (sigbreakHandler != NULL) { 1962 (*sigbreakHandler)(SIGBREAK); 1963 } 1964 return TRUE; 1965 break; 1966 case CTRL_LOGOFF_EVENT: { 1967 // Don't terminate JVM if it is running in a non-interactive session, 1968 // such as a service process. 1969 USEROBJECTFLAGS flags; 1970 HANDLE handle = GetProcessWindowStation(); 1971 if (handle != NULL && 1972 GetUserObjectInformation(handle, UOI_FLAGS, &flags, 1973 sizeof(USEROBJECTFLAGS), NULL)) { 1974 // If it is a non-interactive session, let next handler to deal 1975 // with it. 1976 if ((flags.dwFlags & WSF_VISIBLE) == 0) { 1977 return FALSE; 1978 } 1979 } 1980 } 1981 case CTRL_CLOSE_EVENT: 1982 case CTRL_SHUTDOWN_EVENT: 1983 os::signal_raise(SIGTERM); 1984 return TRUE; 1985 break; 1986 default: 1987 break; 1988 } 1989 return FALSE; 1990 } 1991 1992 // The following code is moved from os.cpp for making this 1993 // code platform specific, which it is by its very nature. 1994 1995 // Return maximum OS signal used + 1 for internal use only 1996 // Used as exit signal for signal_thread 1997 int os::sigexitnum_pd() { 1998 return NSIG; 1999 } 2000 2001 // a counter for each possible signal value, including signal_thread exit signal 2002 static volatile jint pending_signals[NSIG+1] = { 0 }; 2003 static HANDLE sig_sem = NULL; 2004 2005 void os::signal_init_pd() { 2006 // Initialize signal structures 2007 memset((void*)pending_signals, 0, sizeof(pending_signals)); 2008 2009 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 2010 2011 // Programs embedding the VM do not want it to attempt to receive 2012 // events like CTRL_LOGOFF_EVENT, which are used to implement the 2013 // shutdown hooks mechanism introduced in 1.3. For example, when 2014 // the VM is run as part of a Windows NT service (i.e., a servlet 2015 // engine in a web server), the correct behavior is for any console 2016 // control handler to return FALSE, not TRUE, because the OS's 2017 // "final" handler for such events allows the process to continue if 2018 // it is a service (while terminating it if it is not a service). 2019 // To make this behavior uniform and the mechanism simpler, we 2020 // completely disable the VM's usage of these console events if -Xrs 2021 // (=ReduceSignalUsage) is specified. This means, for example, that 2022 // the CTRL-BREAK thread dump mechanism is also disabled in this 2023 // case. See bugs 4323062, 4345157, and related bugs. 2024 2025 if (!ReduceSignalUsage) { 2026 // Add a CTRL-C handler 2027 SetConsoleCtrlHandler(consoleHandler, TRUE); 2028 } 2029 } 2030 2031 void os::signal_notify(int signal_number) { 2032 BOOL ret; 2033 if (sig_sem != NULL) { 2034 Atomic::inc(&pending_signals[signal_number]); 2035 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2036 assert(ret != 0, "ReleaseSemaphore() failed"); 2037 } 2038 } 2039 2040 static int check_pending_signals(bool wait_for_signal) { 2041 DWORD ret; 2042 while (true) { 2043 for (int i = 0; i < NSIG + 1; i++) { 2044 jint n = pending_signals[i]; 2045 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2046 return i; 2047 } 2048 } 2049 if (!wait_for_signal) { 2050 return -1; 2051 } 2052 2053 JavaThread *thread = JavaThread::current(); 2054 2055 ThreadBlockInVM tbivm(thread); 2056 2057 bool threadIsSuspended; 2058 do { 2059 thread->set_suspend_equivalent(); 2060 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2061 ret = ::WaitForSingleObject(sig_sem, INFINITE); 2062 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 2063 2064 // were we externally suspended while we were waiting? 2065 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2066 if (threadIsSuspended) { 2067 // The semaphore has been incremented, but while we were waiting 2068 // another thread suspended us. We don't want to continue running 2069 // while suspended because that would surprise the thread that 2070 // suspended us. 2071 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2072 assert(ret != 0, "ReleaseSemaphore() failed"); 2073 2074 thread->java_suspend_self(); 2075 } 2076 } while (threadIsSuspended); 2077 } 2078 } 2079 2080 int os::signal_lookup() { 2081 return check_pending_signals(false); 2082 } 2083 2084 int os::signal_wait() { 2085 return check_pending_signals(true); 2086 } 2087 2088 // Implicit OS exception handling 2089 2090 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, 2091 address handler) { 2092 JavaThread* thread = JavaThread::current(); 2093 // Save pc in thread 2094 #ifdef _M_IA64 2095 // Do not blow up if no thread info available. 2096 if (thread) { 2097 // Saving PRECISE pc (with slot information) in thread. 2098 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress; 2099 // Convert precise PC into "Unix" format 2100 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2); 2101 thread->set_saved_exception_pc((address)precise_pc); 2102 } 2103 // Set pc to handler 2104 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 2105 // Clear out psr.ri (= Restart Instruction) in order to continue 2106 // at the beginning of the target bundle. 2107 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF; 2108 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!"); 2109 #elif _M_AMD64 2110 // Do not blow up if no thread info available. 2111 if (thread) { 2112 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip); 2113 } 2114 // Set pc to handler 2115 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 2116 #else 2117 // Do not blow up if no thread info available. 2118 if (thread) { 2119 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip); 2120 } 2121 // Set pc to handler 2122 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler; 2123 #endif 2124 2125 // Continue the execution 2126 return EXCEPTION_CONTINUE_EXECUTION; 2127 } 2128 2129 2130 // Used for PostMortemDump 2131 extern "C" void safepoints(); 2132 extern "C" void find(int x); 2133 extern "C" void events(); 2134 2135 // According to Windows API documentation, an illegal instruction sequence should generate 2136 // the 0xC000001C exception code. However, real world experience shows that occasionnaly 2137 // the execution of an illegal instruction can generate the exception code 0xC000001E. This 2138 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 2139 2140 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 2141 2142 // From "Execution Protection in the Windows Operating System" draft 0.35 2143 // Once a system header becomes available, the "real" define should be 2144 // included or copied here. 2145 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2146 2147 // Handle NAT Bit consumption on IA64. 2148 #ifdef _M_IA64 2149 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION 2150 #endif 2151 2152 // Windows Vista/2008 heap corruption check 2153 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374 2154 2155 #define def_excpt(val) #val, val 2156 2157 struct siglabel { 2158 char *name; 2159 int number; 2160 }; 2161 2162 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual 2163 // C++ compiler contain this error code. Because this is a compiler-generated 2164 // error, the code is not listed in the Win32 API header files. 2165 // The code is actually a cryptic mnemonic device, with the initial "E" 2166 // standing for "exception" and the final 3 bytes (0x6D7363) representing the 2167 // ASCII values of "msc". 2168 2169 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363 2170 2171 2172 struct siglabel exceptlabels[] = { 2173 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2174 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2175 def_excpt(EXCEPTION_BREAKPOINT), 2176 def_excpt(EXCEPTION_SINGLE_STEP), 2177 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2178 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2179 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2180 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2181 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2182 def_excpt(EXCEPTION_FLT_OVERFLOW), 2183 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2184 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2185 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2186 def_excpt(EXCEPTION_INT_OVERFLOW), 2187 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2188 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2189 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2190 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2191 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2192 def_excpt(EXCEPTION_STACK_OVERFLOW), 2193 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2194 def_excpt(EXCEPTION_GUARD_PAGE), 2195 def_excpt(EXCEPTION_INVALID_HANDLE), 2196 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION), 2197 def_excpt(EXCEPTION_HEAP_CORRUPTION), 2198 #ifdef _M_IA64 2199 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION), 2200 #endif 2201 NULL, 0 2202 }; 2203 2204 const char* os::exception_name(int exception_code, char *buf, size_t size) { 2205 for (int i = 0; exceptlabels[i].name != NULL; i++) { 2206 if (exceptlabels[i].number == exception_code) { 2207 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2208 return buf; 2209 } 2210 } 2211 2212 return NULL; 2213 } 2214 2215 //----------------------------------------------------------------------------- 2216 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2217 // handle exception caused by idiv; should only happen for -MinInt/-1 2218 // (division by zero is handled explicitly) 2219 #ifdef _M_IA64 2220 assert(0, "Fix Handle_IDiv_Exception"); 2221 #elif _M_AMD64 2222 PCONTEXT ctx = exceptionInfo->ContextRecord; 2223 address pc = (address)ctx->Rip; 2224 assert(pc[0] == 0xF7, "not an idiv opcode"); 2225 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2226 assert(ctx->Rax == min_jint, "unexpected idiv exception"); 2227 // set correct result values and continue after idiv instruction 2228 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2229 ctx->Rax = (DWORD)min_jint; // result 2230 ctx->Rdx = (DWORD)0; // remainder 2231 // Continue the execution 2232 #else 2233 PCONTEXT ctx = exceptionInfo->ContextRecord; 2234 address pc = (address)ctx->Eip; 2235 assert(pc[0] == 0xF7, "not an idiv opcode"); 2236 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2237 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2238 // set correct result values and continue after idiv instruction 2239 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2240 ctx->Eax = (DWORD)min_jint; // result 2241 ctx->Edx = (DWORD)0; // remainder 2242 // Continue the execution 2243 #endif 2244 return EXCEPTION_CONTINUE_EXECUTION; 2245 } 2246 2247 //----------------------------------------------------------------------------- 2248 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2249 PCONTEXT ctx = exceptionInfo->ContextRecord; 2250 #ifndef _WIN64 2251 // handle exception caused by native method modifying control word 2252 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2253 2254 switch (exception_code) { 2255 case EXCEPTION_FLT_DENORMAL_OPERAND: 2256 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2257 case EXCEPTION_FLT_INEXACT_RESULT: 2258 case EXCEPTION_FLT_INVALID_OPERATION: 2259 case EXCEPTION_FLT_OVERFLOW: 2260 case EXCEPTION_FLT_STACK_CHECK: 2261 case EXCEPTION_FLT_UNDERFLOW: 2262 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2263 if (fp_control_word != ctx->FloatSave.ControlWord) { 2264 // Restore FPCW and mask out FLT exceptions 2265 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2266 // Mask out pending FLT exceptions 2267 ctx->FloatSave.StatusWord &= 0xffffff00; 2268 return EXCEPTION_CONTINUE_EXECUTION; 2269 } 2270 } 2271 2272 if (prev_uef_handler != NULL) { 2273 // We didn't handle this exception so pass it to the previous 2274 // UnhandledExceptionFilter. 2275 return (prev_uef_handler)(exceptionInfo); 2276 } 2277 #else // !_WIN64 2278 // On Windows, the mxcsr control bits are non-volatile across calls 2279 // See also CR 6192333 2280 // 2281 jint MxCsr = INITIAL_MXCSR; 2282 // we can't use StubRoutines::addr_mxcsr_std() 2283 // because in Win64 mxcsr is not saved there 2284 if (MxCsr != ctx->MxCsr) { 2285 ctx->MxCsr = MxCsr; 2286 return EXCEPTION_CONTINUE_EXECUTION; 2287 } 2288 #endif // !_WIN64 2289 2290 return EXCEPTION_CONTINUE_SEARCH; 2291 } 2292 2293 static inline void report_error(Thread* t, DWORD exception_code, 2294 address addr, void* siginfo, void* context) { 2295 VMError err(t, exception_code, addr, siginfo, context); 2296 err.report_and_die(); 2297 2298 // If UseOsErrorReporting, this will return here and save the error file 2299 // somewhere where we can find it in the minidump. 2300 } 2301 2302 //----------------------------------------------------------------------------- 2303 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2304 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2305 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2306 #ifdef _M_IA64 2307 // On Itanium, we need the "precise pc", which has the slot number coded 2308 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format). 2309 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress; 2310 // Convert the pc to "Unix format", which has the slot number coded 2311 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2 2312 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction" 2313 // information is saved in the Unix format. 2314 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2)); 2315 #elif _M_AMD64 2316 address pc = (address) exceptionInfo->ContextRecord->Rip; 2317 #else 2318 address pc = (address) exceptionInfo->ContextRecord->Eip; 2319 #endif 2320 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 2321 2322 // Handle SafeFetch32 and SafeFetchN exceptions. 2323 if (StubRoutines::is_safefetch_fault(pc)) { 2324 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc)); 2325 } 2326 2327 #ifndef _WIN64 2328 // Execution protection violation - win32 running on AMD64 only 2329 // Handled first to avoid misdiagnosis as a "normal" access violation; 2330 // This is safe to do because we have a new/unique ExceptionInformation 2331 // code for this condition. 2332 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2333 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2334 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2335 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2336 2337 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2338 int page_size = os::vm_page_size(); 2339 2340 // Make sure the pc and the faulting address are sane. 2341 // 2342 // If an instruction spans a page boundary, and the page containing 2343 // the beginning of the instruction is executable but the following 2344 // page is not, the pc and the faulting address might be slightly 2345 // different - we still want to unguard the 2nd page in this case. 2346 // 2347 // 15 bytes seems to be a (very) safe value for max instruction size. 2348 bool pc_is_near_addr = 2349 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2350 bool instr_spans_page_boundary = 2351 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2352 (intptr_t) page_size) > 0); 2353 2354 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2355 static volatile address last_addr = 2356 (address) os::non_memory_address_word(); 2357 2358 // In conservative mode, don't unguard unless the address is in the VM 2359 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2360 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2361 2362 // Set memory to RWX and retry 2363 address page_start = 2364 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2365 bool res = os::protect_memory((char*) page_start, page_size, 2366 os::MEM_PROT_RWX); 2367 2368 if (PrintMiscellaneous && Verbose) { 2369 char buf[256]; 2370 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 2371 "at " INTPTR_FORMAT 2372 ", unguarding " INTPTR_FORMAT ": %s", addr, 2373 page_start, (res ? "success" : strerror(errno))); 2374 tty->print_raw_cr(buf); 2375 } 2376 2377 // Set last_addr so if we fault again at the same address, we don't 2378 // end up in an endless loop. 2379 // 2380 // There are two potential complications here. Two threads trapping 2381 // at the same address at the same time could cause one of the 2382 // threads to think it already unguarded, and abort the VM. Likely 2383 // very rare. 2384 // 2385 // The other race involves two threads alternately trapping at 2386 // different addresses and failing to unguard the page, resulting in 2387 // an endless loop. This condition is probably even more unlikely 2388 // than the first. 2389 // 2390 // Although both cases could be avoided by using locks or thread 2391 // local last_addr, these solutions are unnecessary complication: 2392 // this handler is a best-effort safety net, not a complete solution. 2393 // It is disabled by default and should only be used as a workaround 2394 // in case we missed any no-execute-unsafe VM code. 2395 2396 last_addr = addr; 2397 2398 return EXCEPTION_CONTINUE_EXECUTION; 2399 } 2400 } 2401 2402 // Last unguard failed or not unguarding 2403 tty->print_raw_cr("Execution protection violation"); 2404 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2405 exceptionInfo->ContextRecord); 2406 return EXCEPTION_CONTINUE_SEARCH; 2407 } 2408 } 2409 #endif // _WIN64 2410 2411 // Check to see if we caught the safepoint code in the 2412 // process of write protecting the memory serialization page. 2413 // It write enables the page immediately after protecting it 2414 // so just return. 2415 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2416 JavaThread* thread = (JavaThread*) t; 2417 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2418 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2419 if (os::is_memory_serialize_page(thread, addr)) { 2420 // Block current thread until the memory serialize page permission restored. 2421 os::block_on_serialize_page_trap(); 2422 return EXCEPTION_CONTINUE_EXECUTION; 2423 } 2424 } 2425 2426 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) && 2427 VM_Version::is_cpuinfo_segv_addr(pc)) { 2428 // Verify that OS save/restore AVX registers. 2429 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr()); 2430 } 2431 2432 if (t != NULL && t->is_Java_thread()) { 2433 JavaThread* thread = (JavaThread*) t; 2434 bool in_java = thread->thread_state() == _thread_in_Java; 2435 2436 // Handle potential stack overflows up front. 2437 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2438 if (os::uses_stack_guard_pages()) { 2439 #ifdef _M_IA64 2440 // Use guard page for register stack. 2441 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2442 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2443 // Check for a register stack overflow on Itanium 2444 if (thread->addr_inside_register_stack_red_zone(addr)) { 2445 // Fatal red zone violation happens if the Java program 2446 // catches a StackOverflow error and does so much processing 2447 // that it runs beyond the unprotected yellow guard zone. As 2448 // a result, we are out of here. 2449 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit."); 2450 } else if(thread->addr_inside_register_stack(addr)) { 2451 // Disable the yellow zone which sets the state that 2452 // we've got a stack overflow problem. 2453 if (thread->stack_yellow_zone_enabled()) { 2454 thread->disable_stack_yellow_zone(); 2455 } 2456 // Give us some room to process the exception. 2457 thread->disable_register_stack_guard(); 2458 // Tracing with +Verbose. 2459 if (Verbose) { 2460 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc); 2461 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr); 2462 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base()); 2463 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]", 2464 thread->register_stack_base(), 2465 thread->register_stack_base() + thread->stack_size()); 2466 } 2467 2468 // Reguard the permanent register stack red zone just to be sure. 2469 // We saw Windows silently disabling this without telling us. 2470 thread->enable_register_stack_red_zone(); 2471 2472 return Handle_Exception(exceptionInfo, 2473 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2474 } 2475 #endif 2476 if (thread->stack_yellow_zone_enabled()) { 2477 // Yellow zone violation. The o/s has unprotected the first yellow 2478 // zone page for us. Note: must call disable_stack_yellow_zone to 2479 // update the enabled status, even if the zone contains only one page. 2480 thread->disable_stack_yellow_zone(); 2481 // If not in java code, return and hope for the best. 2482 return in_java 2483 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2484 : EXCEPTION_CONTINUE_EXECUTION; 2485 } else { 2486 // Fatal red zone violation. 2487 thread->disable_stack_red_zone(); 2488 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2489 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2490 exceptionInfo->ContextRecord); 2491 return EXCEPTION_CONTINUE_SEARCH; 2492 } 2493 } else if (in_java) { 2494 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2495 // a one-time-only guard page, which it has released to us. The next 2496 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2497 return Handle_Exception(exceptionInfo, 2498 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2499 } else { 2500 // Can only return and hope for the best. Further stack growth will 2501 // result in an ACCESS_VIOLATION. 2502 return EXCEPTION_CONTINUE_EXECUTION; 2503 } 2504 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2505 // Either stack overflow or null pointer exception. 2506 if (in_java) { 2507 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2508 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2509 address stack_end = thread->stack_base() - thread->stack_size(); 2510 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2511 // Stack overflow. 2512 assert(!os::uses_stack_guard_pages(), 2513 "should be caught by red zone code above."); 2514 return Handle_Exception(exceptionInfo, 2515 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2516 } 2517 // Check for safepoint polling and implicit null 2518 // We only expect null pointers in the stubs (vtable) 2519 // the rest are checked explicitly now. 2520 CodeBlob* cb = CodeCache::find_blob(pc); 2521 if (cb != NULL) { 2522 if (os::is_poll_address(addr)) { 2523 address stub = SharedRuntime::get_poll_stub(pc); 2524 return Handle_Exception(exceptionInfo, stub); 2525 } 2526 } 2527 { 2528 #ifdef _WIN64 2529 // If it's a legal stack address map the entire region in 2530 // 2531 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2532 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2533 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) { 2534 addr = (address)((uintptr_t)addr & 2535 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2536 os::commit_memory((char *)addr, thread->stack_base() - addr, 2537 !ExecMem); 2538 return EXCEPTION_CONTINUE_EXECUTION; 2539 } else 2540 #endif 2541 { 2542 // Null pointer exception. 2543 #ifdef _M_IA64 2544 // Process implicit null checks in compiled code. Note: Implicit null checks 2545 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs. 2546 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) { 2547 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format); 2548 // Handle implicit null check in UEP method entry 2549 if (cb && (cb->is_frame_complete_at(pc) || 2550 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) { 2551 if (Verbose) { 2552 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0); 2553 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format); 2554 tty->print_cr(" to addr " INTPTR_FORMAT, addr); 2555 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)", 2556 *(bundle_start + 1), *bundle_start); 2557 } 2558 return Handle_Exception(exceptionInfo, 2559 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL)); 2560 } 2561 } 2562 2563 // Implicit null checks were processed above. Hence, we should not reach 2564 // here in the usual case => die! 2565 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception"); 2566 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2567 exceptionInfo->ContextRecord); 2568 return EXCEPTION_CONTINUE_SEARCH; 2569 2570 #else // !IA64 2571 2572 // Windows 98 reports faulting addresses incorrectly 2573 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2574 !os::win32::is_nt()) { 2575 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2576 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2577 } 2578 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2579 exceptionInfo->ContextRecord); 2580 return EXCEPTION_CONTINUE_SEARCH; 2581 #endif 2582 } 2583 } 2584 } 2585 2586 #ifdef _WIN64 2587 // Special care for fast JNI field accessors. 2588 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2589 // in and the heap gets shrunk before the field access. 2590 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2591 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2592 if (addr != (address)-1) { 2593 return Handle_Exception(exceptionInfo, addr); 2594 } 2595 } 2596 #endif 2597 2598 // Stack overflow or null pointer exception in native code. 2599 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2600 exceptionInfo->ContextRecord); 2601 return EXCEPTION_CONTINUE_SEARCH; 2602 } // /EXCEPTION_ACCESS_VIOLATION 2603 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2604 #if defined _M_IA64 2605 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION || 2606 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) { 2607 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0); 2608 2609 // Compiled method patched to be non entrant? Following conditions must apply: 2610 // 1. must be first instruction in bundle 2611 // 2. must be a break instruction with appropriate code 2612 if ((((uint64_t) pc & 0x0F) == 0) && 2613 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) { 2614 return Handle_Exception(exceptionInfo, 2615 (address)SharedRuntime::get_handle_wrong_method_stub()); 2616 } 2617 } // /EXCEPTION_ILLEGAL_INSTRUCTION 2618 #endif 2619 2620 2621 if (in_java) { 2622 switch (exception_code) { 2623 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2624 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2625 2626 case EXCEPTION_INT_OVERFLOW: 2627 return Handle_IDiv_Exception(exceptionInfo); 2628 2629 } // switch 2630 } 2631 if (((thread->thread_state() == _thread_in_Java) || 2632 (thread->thread_state() == _thread_in_native)) && 2633 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) { 2634 LONG result=Handle_FLT_Exception(exceptionInfo); 2635 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2636 } 2637 } 2638 2639 if (exception_code != EXCEPTION_BREAKPOINT) { 2640 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2641 exceptionInfo->ContextRecord); 2642 } 2643 return EXCEPTION_CONTINUE_SEARCH; 2644 } 2645 2646 #ifndef _WIN64 2647 // Special care for fast JNI accessors. 2648 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2649 // the heap gets shrunk before the field access. 2650 // Need to install our own structured exception handler since native code may 2651 // install its own. 2652 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2653 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2654 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2655 address pc = (address) exceptionInfo->ContextRecord->Eip; 2656 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2657 if (addr != (address)-1) { 2658 return Handle_Exception(exceptionInfo, addr); 2659 } 2660 } 2661 return EXCEPTION_CONTINUE_SEARCH; 2662 } 2663 2664 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \ 2665 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \ 2666 jobject obj, \ 2667 jfieldID fieldID) { \ 2668 __try { \ 2669 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \ 2670 obj, \ 2671 fieldID); \ 2672 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \ 2673 _exception_info())) { \ 2674 } \ 2675 return 0; \ 2676 } 2677 2678 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2679 DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2680 DEFINE_FAST_GETFIELD(jchar, char, Char) 2681 DEFINE_FAST_GETFIELD(jshort, short, Short) 2682 DEFINE_FAST_GETFIELD(jint, int, Int) 2683 DEFINE_FAST_GETFIELD(jlong, long, Long) 2684 DEFINE_FAST_GETFIELD(jfloat, float, Float) 2685 DEFINE_FAST_GETFIELD(jdouble, double, Double) 2686 2687 address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2688 switch (type) { 2689 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2690 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2691 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2692 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2693 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2694 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2695 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2696 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2697 default: ShouldNotReachHere(); 2698 } 2699 return (address)-1; 2700 } 2701 #endif 2702 2703 void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) { 2704 // Install a win32 structured exception handler around the test 2705 // function call so the VM can generate an error dump if needed. 2706 __try { 2707 (*funcPtr)(); 2708 } __except(topLevelExceptionFilter( 2709 (_EXCEPTION_POINTERS*)_exception_info())) { 2710 // Nothing to do. 2711 } 2712 } 2713 2714 // Virtual Memory 2715 2716 int os::vm_page_size() { return os::win32::vm_page_size(); } 2717 int os::vm_allocation_granularity() { 2718 return os::win32::vm_allocation_granularity(); 2719 } 2720 2721 // Windows large page support is available on Windows 2003. In order to use 2722 // large page memory, the administrator must first assign additional privilege 2723 // to the user: 2724 // + select Control Panel -> Administrative Tools -> Local Security Policy 2725 // + select Local Policies -> User Rights Assignment 2726 // + double click "Lock pages in memory", add users and/or groups 2727 // + reboot 2728 // Note the above steps are needed for administrator as well, as administrators 2729 // by default do not have the privilege to lock pages in memory. 2730 // 2731 // Note about Windows 2003: although the API supports committing large page 2732 // memory on a page-by-page basis and VirtualAlloc() returns success under this 2733 // scenario, I found through experiment it only uses large page if the entire 2734 // memory region is reserved and committed in a single VirtualAlloc() call. 2735 // This makes Windows large page support more or less like Solaris ISM, in 2736 // that the entire heap must be committed upfront. This probably will change 2737 // in the future, if so the code below needs to be revisited. 2738 2739 #ifndef MEM_LARGE_PAGES 2740 #define MEM_LARGE_PAGES 0x20000000 2741 #endif 2742 2743 static HANDLE _hProcess; 2744 static HANDLE _hToken; 2745 2746 // Container for NUMA node list info 2747 class NUMANodeListHolder { 2748 private: 2749 int *_numa_used_node_list; // allocated below 2750 int _numa_used_node_count; 2751 2752 void free_node_list() { 2753 if (_numa_used_node_list != NULL) { 2754 FREE_C_HEAP_ARRAY(int, _numa_used_node_list); 2755 } 2756 } 2757 2758 public: 2759 NUMANodeListHolder() { 2760 _numa_used_node_count = 0; 2761 _numa_used_node_list = NULL; 2762 // do rest of initialization in build routine (after function pointers are set up) 2763 } 2764 2765 ~NUMANodeListHolder() { 2766 free_node_list(); 2767 } 2768 2769 bool build() { 2770 DWORD_PTR proc_aff_mask; 2771 DWORD_PTR sys_aff_mask; 2772 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false; 2773 ULONG highest_node_number; 2774 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false; 2775 free_node_list(); 2776 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal); 2777 for (unsigned int i = 0; i <= highest_node_number; i++) { 2778 ULONGLONG proc_mask_numa_node; 2779 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false; 2780 if ((proc_aff_mask & proc_mask_numa_node)!=0) { 2781 _numa_used_node_list[_numa_used_node_count++] = i; 2782 } 2783 } 2784 return (_numa_used_node_count > 1); 2785 } 2786 2787 int get_count() { return _numa_used_node_count; } 2788 int get_node_list_entry(int n) { 2789 // for indexes out of range, returns -1 2790 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1); 2791 } 2792 2793 } numa_node_list_holder; 2794 2795 2796 2797 static size_t _large_page_size = 0; 2798 2799 static bool resolve_functions_for_large_page_init() { 2800 return os::Kernel32Dll::GetLargePageMinimumAvailable() && 2801 os::Advapi32Dll::AdvapiAvailable(); 2802 } 2803 2804 static bool request_lock_memory_privilege() { 2805 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2806 os::current_process_id()); 2807 2808 LUID luid; 2809 if (_hProcess != NULL && 2810 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2811 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2812 2813 TOKEN_PRIVILEGES tp; 2814 tp.PrivilegeCount = 1; 2815 tp.Privileges[0].Luid = luid; 2816 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2817 2818 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2819 // privilege. Check GetLastError() too. See MSDN document. 2820 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2821 (GetLastError() == ERROR_SUCCESS)) { 2822 return true; 2823 } 2824 } 2825 2826 return false; 2827 } 2828 2829 static void cleanup_after_large_page_init() { 2830 if (_hProcess) CloseHandle(_hProcess); 2831 _hProcess = NULL; 2832 if (_hToken) CloseHandle(_hToken); 2833 _hToken = NULL; 2834 } 2835 2836 static bool numa_interleaving_init() { 2837 bool success = false; 2838 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving); 2839 2840 // print a warning if UseNUMAInterleaving flag is specified on command line 2841 bool warn_on_failure = use_numa_interleaving_specified; 2842 #define WARN(msg) if (warn_on_failure) { warning(msg); } 2843 2844 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages) 2845 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2846 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity); 2847 2848 if (os::Kernel32Dll::NumaCallsAvailable()) { 2849 if (numa_node_list_holder.build()) { 2850 if (PrintMiscellaneous && Verbose) { 2851 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count()); 2852 for (int i = 0; i < numa_node_list_holder.get_count(); i++) { 2853 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i)); 2854 } 2855 tty->print("\n"); 2856 } 2857 success = true; 2858 } else { 2859 WARN("Process does not cover multiple NUMA nodes."); 2860 } 2861 } else { 2862 WARN("NUMA Interleaving is not supported by the operating system."); 2863 } 2864 if (!success) { 2865 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag."); 2866 } 2867 return success; 2868 #undef WARN 2869 } 2870 2871 // this routine is used whenever we need to reserve a contiguous VA range 2872 // but we need to make separate VirtualAlloc calls for each piece of the range 2873 // Reasons for doing this: 2874 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise) 2875 // * UseNUMAInterleaving requires a separate node for each piece 2876 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, 2877 DWORD prot, 2878 bool should_inject_error = false) { 2879 char * p_buf; 2880 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size 2881 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2882 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size; 2883 2884 // first reserve enough address space in advance since we want to be 2885 // able to break a single contiguous virtual address range into multiple 2886 // large page commits but WS2003 does not allow reserving large page space 2887 // so we just use 4K pages for reserve, this gives us a legal contiguous 2888 // address space. then we will deallocate that reservation, and re alloc 2889 // using large pages 2890 const size_t size_of_reserve = bytes + chunk_size; 2891 if (bytes > size_of_reserve) { 2892 // Overflowed. 2893 return NULL; 2894 } 2895 p_buf = (char *) VirtualAlloc(addr, 2896 size_of_reserve, // size of Reserve 2897 MEM_RESERVE, 2898 PAGE_READWRITE); 2899 // If reservation failed, return NULL 2900 if (p_buf == NULL) return NULL; 2901 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC); 2902 os::release_memory(p_buf, bytes + chunk_size); 2903 2904 // we still need to round up to a page boundary (in case we are using large pages) 2905 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size) 2906 // instead we handle this in the bytes_to_rq computation below 2907 p_buf = (char *) align_size_up((size_t)p_buf, page_size); 2908 2909 // now go through and allocate one chunk at a time until all bytes are 2910 // allocated 2911 size_t bytes_remaining = bytes; 2912 // An overflow of align_size_up() would have been caught above 2913 // in the calculation of size_of_reserve. 2914 char * next_alloc_addr = p_buf; 2915 HANDLE hProc = GetCurrentProcess(); 2916 2917 #ifdef ASSERT 2918 // Variable for the failure injection 2919 long ran_num = os::random(); 2920 size_t fail_after = ran_num % bytes; 2921 #endif 2922 2923 int count=0; 2924 while (bytes_remaining) { 2925 // select bytes_to_rq to get to the next chunk_size boundary 2926 2927 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size)); 2928 // Note allocate and commit 2929 char * p_new; 2930 2931 #ifdef ASSERT 2932 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after); 2933 #else 2934 const bool inject_error_now = false; 2935 #endif 2936 2937 if (inject_error_now) { 2938 p_new = NULL; 2939 } else { 2940 if (!UseNUMAInterleaving) { 2941 p_new = (char *) VirtualAlloc(next_alloc_addr, 2942 bytes_to_rq, 2943 flags, 2944 prot); 2945 } else { 2946 // get the next node to use from the used_node_list 2947 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected"); 2948 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count()); 2949 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc, 2950 next_alloc_addr, 2951 bytes_to_rq, 2952 flags, 2953 prot, 2954 node); 2955 } 2956 } 2957 2958 if (p_new == NULL) { 2959 // Free any allocated pages 2960 if (next_alloc_addr > p_buf) { 2961 // Some memory was committed so release it. 2962 size_t bytes_to_release = bytes - bytes_remaining; 2963 // NMT has yet to record any individual blocks, so it 2964 // need to create a dummy 'reserve' record to match 2965 // the release. 2966 MemTracker::record_virtual_memory_reserve((address)p_buf, 2967 bytes_to_release, CALLER_PC); 2968 os::release_memory(p_buf, bytes_to_release); 2969 } 2970 #ifdef ASSERT 2971 if (should_inject_error) { 2972 if (TracePageSizes && Verbose) { 2973 tty->print_cr("Reserving pages individually failed."); 2974 } 2975 } 2976 #endif 2977 return NULL; 2978 } 2979 2980 bytes_remaining -= bytes_to_rq; 2981 next_alloc_addr += bytes_to_rq; 2982 count++; 2983 } 2984 // Although the memory is allocated individually, it is returned as one. 2985 // NMT records it as one block. 2986 if ((flags & MEM_COMMIT) != 0) { 2987 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC); 2988 } else { 2989 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC); 2990 } 2991 2992 // made it this far, success 2993 return p_buf; 2994 } 2995 2996 2997 2998 void os::large_page_init() { 2999 if (!UseLargePages) return; 3000 3001 // print a warning if any large page related flag is specified on command line 3002 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 3003 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 3004 bool success = false; 3005 3006 #define WARN(msg) if (warn_on_failure) { warning(msg); } 3007 if (resolve_functions_for_large_page_init()) { 3008 if (request_lock_memory_privilege()) { 3009 size_t s = os::Kernel32Dll::GetLargePageMinimum(); 3010 if (s) { 3011 #if defined(IA32) || defined(AMD64) 3012 if (s > 4*M || LargePageSizeInBytes > 4*M) { 3013 WARN("JVM cannot use large pages bigger than 4mb."); 3014 } else { 3015 #endif 3016 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 3017 _large_page_size = LargePageSizeInBytes; 3018 } else { 3019 _large_page_size = s; 3020 } 3021 success = true; 3022 #if defined(IA32) || defined(AMD64) 3023 } 3024 #endif 3025 } else { 3026 WARN("Large page is not supported by the processor."); 3027 } 3028 } else { 3029 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 3030 } 3031 } else { 3032 WARN("Large page is not supported by the operating system."); 3033 } 3034 #undef WARN 3035 3036 const size_t default_page_size = (size_t) vm_page_size(); 3037 if (success && _large_page_size > default_page_size) { 3038 _page_sizes[0] = _large_page_size; 3039 _page_sizes[1] = default_page_size; 3040 _page_sizes[2] = 0; 3041 } 3042 3043 cleanup_after_large_page_init(); 3044 UseLargePages = success; 3045 } 3046 3047 // On win32, one cannot release just a part of reserved memory, it's an 3048 // all or nothing deal. When we split a reservation, we must break the 3049 // reservation into two reservations. 3050 void os::pd_split_reserved_memory(char *base, size_t size, size_t split, 3051 bool realloc) { 3052 if (size > 0) { 3053 release_memory(base, size); 3054 if (realloc) { 3055 reserve_memory(split, base); 3056 } 3057 if (size != split) { 3058 reserve_memory(size - split, base + split); 3059 } 3060 } 3061 } 3062 3063 // Multiple threads can race in this code but it's not possible to unmap small sections of 3064 // virtual space to get requested alignment, like posix-like os's. 3065 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe. 3066 char* os::reserve_memory_aligned(size_t size, size_t alignment) { 3067 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 3068 "Alignment must be a multiple of allocation granularity (page size)"); 3069 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 3070 3071 size_t extra_size = size + alignment; 3072 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 3073 3074 char* aligned_base = NULL; 3075 3076 do { 3077 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 3078 if (extra_base == NULL) { 3079 return NULL; 3080 } 3081 // Do manual alignment 3082 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 3083 3084 os::release_memory(extra_base, extra_size); 3085 3086 aligned_base = os::reserve_memory(size, aligned_base); 3087 3088 } while (aligned_base == NULL); 3089 3090 return aligned_base; 3091 } 3092 3093 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 3094 assert((size_t)addr % os::vm_allocation_granularity() == 0, 3095 "reserve alignment"); 3096 assert(bytes % os::vm_page_size() == 0, "reserve page size"); 3097 char* res; 3098 // note that if UseLargePages is on, all the areas that require interleaving 3099 // will go thru reserve_memory_special rather than thru here. 3100 bool use_individual = (UseNUMAInterleaving && !UseLargePages); 3101 if (!use_individual) { 3102 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 3103 } else { 3104 elapsedTimer reserveTimer; 3105 if (Verbose && PrintMiscellaneous) reserveTimer.start(); 3106 // in numa interleaving, we have to allocate pages individually 3107 // (well really chunks of NUMAInterleaveGranularity size) 3108 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE); 3109 if (res == NULL) { 3110 warning("NUMA page allocation failed"); 3111 } 3112 if (Verbose && PrintMiscellaneous) { 3113 reserveTimer.stop(); 3114 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes, 3115 reserveTimer.milliseconds(), reserveTimer.ticks()); 3116 } 3117 } 3118 assert(res == NULL || addr == NULL || addr == res, 3119 "Unexpected address from reserve."); 3120 3121 return res; 3122 } 3123 3124 // Reserve memory at an arbitrary address, only if that area is 3125 // available (and not reserved for something else). 3126 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3127 // Windows os::reserve_memory() fails of the requested address range is 3128 // not avilable. 3129 return reserve_memory(bytes, requested_addr); 3130 } 3131 3132 size_t os::large_page_size() { 3133 return _large_page_size; 3134 } 3135 3136 bool os::can_commit_large_page_memory() { 3137 // Windows only uses large page memory when the entire region is reserved 3138 // and committed in a single VirtualAlloc() call. This may change in the 3139 // future, but with Windows 2003 it's not possible to commit on demand. 3140 return false; 3141 } 3142 3143 bool os::can_execute_large_page_memory() { 3144 return true; 3145 } 3146 3147 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, 3148 bool exec) { 3149 assert(UseLargePages, "only for large pages"); 3150 3151 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { 3152 return NULL; // Fallback to small pages. 3153 } 3154 3155 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 3156 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3157 3158 // with large pages, there are two cases where we need to use Individual Allocation 3159 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003) 3160 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page 3161 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) { 3162 if (TracePageSizes && Verbose) { 3163 tty->print_cr("Reserving large pages individually."); 3164 } 3165 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError); 3166 if (p_buf == NULL) { 3167 // give an appropriate warning message 3168 if (UseNUMAInterleaving) { 3169 warning("NUMA large page allocation failed, UseLargePages flag ignored"); 3170 } 3171 if (UseLargePagesIndividualAllocation) { 3172 warning("Individually allocated large pages failed, " 3173 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 3174 } 3175 return NULL; 3176 } 3177 3178 return p_buf; 3179 3180 } else { 3181 if (TracePageSizes && Verbose) { 3182 tty->print_cr("Reserving large pages in a single large chunk."); 3183 } 3184 // normal policy just allocate it all at once 3185 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3186 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); 3187 if (res != NULL) { 3188 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC); 3189 } 3190 3191 return res; 3192 } 3193 } 3194 3195 bool os::release_memory_special(char* base, size_t bytes) { 3196 assert(base != NULL, "Sanity check"); 3197 return release_memory(base, bytes); 3198 } 3199 3200 void os::print_statistics() { 3201 } 3202 3203 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) { 3204 int err = os::get_last_error(); 3205 char buf[256]; 3206 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3207 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 3208 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3209 exec, buf_len != 0 ? buf : "<no_error_string>", err); 3210 } 3211 3212 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 3213 if (bytes == 0) { 3214 // Don't bother the OS with noops. 3215 return true; 3216 } 3217 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 3218 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 3219 // Don't attempt to print anything if the OS call fails. We're 3220 // probably low on resources, so the print itself may cause crashes. 3221 3222 // unless we have NUMAInterleaving enabled, the range of a commit 3223 // is always within a reserve covered by a single VirtualAlloc 3224 // in that case we can just do a single commit for the requested size 3225 if (!UseNUMAInterleaving) { 3226 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) { 3227 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3228 return false; 3229 } 3230 if (exec) { 3231 DWORD oldprot; 3232 // Windows doc says to use VirtualProtect to get execute permissions 3233 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) { 3234 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3235 return false; 3236 } 3237 } 3238 return true; 3239 } else { 3240 3241 // when NUMAInterleaving is enabled, the commit might cover a range that 3242 // came from multiple VirtualAlloc reserves (using allocate_pages_individually). 3243 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery 3244 // returns represents the number of bytes that can be committed in one step. 3245 size_t bytes_remaining = bytes; 3246 char * next_alloc_addr = addr; 3247 while (bytes_remaining > 0) { 3248 MEMORY_BASIC_INFORMATION alloc_info; 3249 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info)); 3250 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3251 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, 3252 PAGE_READWRITE) == NULL) { 3253 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3254 exec);) 3255 return false; 3256 } 3257 if (exec) { 3258 DWORD oldprot; 3259 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, 3260 PAGE_EXECUTE_READWRITE, &oldprot)) { 3261 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3262 exec);) 3263 return false; 3264 } 3265 } 3266 bytes_remaining -= bytes_to_rq; 3267 next_alloc_addr += bytes_to_rq; 3268 } 3269 } 3270 // if we made it this far, return true 3271 return true; 3272 } 3273 3274 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 3275 bool exec) { 3276 // alignment_hint is ignored on this OS 3277 return pd_commit_memory(addr, size, exec); 3278 } 3279 3280 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 3281 const char* mesg) { 3282 assert(mesg != NULL, "mesg must be specified"); 3283 if (!pd_commit_memory(addr, size, exec)) { 3284 warn_fail_commit_memory(addr, size, exec); 3285 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); 3286 } 3287 } 3288 3289 void os::pd_commit_memory_or_exit(char* addr, size_t size, 3290 size_t alignment_hint, bool exec, 3291 const char* mesg) { 3292 // alignment_hint is ignored on this OS 3293 pd_commit_memory_or_exit(addr, size, exec, mesg); 3294 } 3295 3296 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3297 if (bytes == 0) { 3298 // Don't bother the OS with noops. 3299 return true; 3300 } 3301 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 3302 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 3303 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0); 3304 } 3305 3306 bool os::pd_release_memory(char* addr, size_t bytes) { 3307 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 3308 } 3309 3310 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 3311 return os::commit_memory(addr, size, !ExecMem); 3312 } 3313 3314 bool os::remove_stack_guard_pages(char* addr, size_t size) { 3315 return os::uncommit_memory(addr, size); 3316 } 3317 3318 // Set protections specified 3319 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3320 bool is_committed) { 3321 unsigned int p = 0; 3322 switch (prot) { 3323 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 3324 case MEM_PROT_READ: p = PAGE_READONLY; break; 3325 case MEM_PROT_RW: p = PAGE_READWRITE; break; 3326 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 3327 default: 3328 ShouldNotReachHere(); 3329 } 3330 3331 DWORD old_status; 3332 3333 // Strange enough, but on Win32 one can change protection only for committed 3334 // memory, not a big deal anyway, as bytes less or equal than 64K 3335 if (!is_committed) { 3336 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX, 3337 "cannot commit protection page"); 3338 } 3339 // One cannot use os::guard_memory() here, as on Win32 guard page 3340 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 3341 // 3342 // Pages in the region become guard pages. Any attempt to access a guard page 3343 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 3344 // the guard page status. Guard pages thus act as a one-time access alarm. 3345 return VirtualProtect(addr, bytes, p, &old_status) != 0; 3346 } 3347 3348 bool os::guard_memory(char* addr, size_t bytes) { 3349 DWORD old_status; 3350 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 3351 } 3352 3353 bool os::unguard_memory(char* addr, size_t bytes) { 3354 DWORD old_status; 3355 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 3356 } 3357 3358 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3359 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3360 void os::numa_make_global(char *addr, size_t bytes) { } 3361 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 3362 bool os::numa_topology_changed() { return false; } 3363 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); } 3364 int os::numa_get_group_id() { return 0; } 3365 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 3366 if (numa_node_list_holder.get_count() == 0 && size > 0) { 3367 // Provide an answer for UMA systems 3368 ids[0] = 0; 3369 return 1; 3370 } else { 3371 // check for size bigger than actual groups_num 3372 size = MIN2(size, numa_get_groups_num()); 3373 for (int i = 0; i < (int)size; i++) { 3374 ids[i] = numa_node_list_holder.get_node_list_entry(i); 3375 } 3376 return size; 3377 } 3378 } 3379 3380 bool os::get_page_info(char *start, page_info* info) { 3381 return false; 3382 } 3383 3384 char *os::scan_pages(char *start, char* end, page_info* page_expected, 3385 page_info* page_found) { 3386 return end; 3387 } 3388 3389 char* os::non_memory_address_word() { 3390 // Must never look like an address returned by reserve_memory, 3391 // even in its subfields (as defined by the CPU immediate fields, 3392 // if the CPU splits constants across multiple instructions). 3393 return (char*)-1; 3394 } 3395 3396 #define MAX_ERROR_COUNT 100 3397 #define SYS_THREAD_ERROR 0xffffffffUL 3398 3399 void os::pd_start_thread(Thread* thread) { 3400 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 3401 // Returns previous suspend state: 3402 // 0: Thread was not suspended 3403 // 1: Thread is running now 3404 // >1: Thread is still suspended. 3405 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3406 } 3407 3408 class HighResolutionInterval : public CHeapObj<mtThread> { 3409 // The default timer resolution seems to be 10 milliseconds. 3410 // (Where is this written down?) 3411 // If someone wants to sleep for only a fraction of the default, 3412 // then we set the timer resolution down to 1 millisecond for 3413 // the duration of their interval. 3414 // We carefully set the resolution back, since otherwise we 3415 // seem to incur an overhead (3%?) that we don't need. 3416 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 3417 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 3418 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 3419 // timeBeginPeriod() if the relative error exceeded some threshold. 3420 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 3421 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 3422 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 3423 // resolution timers running. 3424 private: 3425 jlong resolution; 3426 public: 3427 HighResolutionInterval(jlong ms) { 3428 resolution = ms % 10L; 3429 if (resolution != 0) { 3430 MMRESULT result = timeBeginPeriod(1L); 3431 } 3432 } 3433 ~HighResolutionInterval() { 3434 if (resolution != 0) { 3435 MMRESULT result = timeEndPeriod(1L); 3436 } 3437 resolution = 0L; 3438 } 3439 }; 3440 3441 int os::sleep(Thread* thread, jlong ms, bool interruptable) { 3442 jlong limit = (jlong) MAXDWORD; 3443 3444 while (ms > limit) { 3445 int res; 3446 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) { 3447 return res; 3448 } 3449 ms -= limit; 3450 } 3451 3452 assert(thread == Thread::current(), "thread consistency check"); 3453 OSThread* osthread = thread->osthread(); 3454 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 3455 int result; 3456 if (interruptable) { 3457 assert(thread->is_Java_thread(), "must be java thread"); 3458 JavaThread *jt = (JavaThread *) thread; 3459 ThreadBlockInVM tbivm(jt); 3460 3461 jt->set_suspend_equivalent(); 3462 // cleared by handle_special_suspend_equivalent_condition() or 3463 // java_suspend_self() via check_and_wait_while_suspended() 3464 3465 HANDLE events[1]; 3466 events[0] = osthread->interrupt_event(); 3467 HighResolutionInterval *phri=NULL; 3468 if (!ForceTimeHighResolution) { 3469 phri = new HighResolutionInterval(ms); 3470 } 3471 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 3472 result = OS_TIMEOUT; 3473 } else { 3474 ResetEvent(osthread->interrupt_event()); 3475 osthread->set_interrupted(false); 3476 result = OS_INTRPT; 3477 } 3478 delete phri; //if it is NULL, harmless 3479 3480 // were we externally suspended while we were waiting? 3481 jt->check_and_wait_while_suspended(); 3482 } else { 3483 assert(!thread->is_Java_thread(), "must not be java thread"); 3484 Sleep((long) ms); 3485 result = OS_TIMEOUT; 3486 } 3487 return result; 3488 } 3489 3490 // Short sleep, direct OS call. 3491 // 3492 // ms = 0, means allow others (if any) to run. 3493 // 3494 void os::naked_short_sleep(jlong ms) { 3495 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3496 Sleep(ms); 3497 } 3498 3499 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3500 void os::infinite_sleep() { 3501 while (true) { // sleep forever ... 3502 Sleep(100000); // ... 100 seconds at a time 3503 } 3504 } 3505 3506 typedef BOOL (WINAPI * STTSignature)(void); 3507 3508 void os::naked_yield() { 3509 // Use either SwitchToThread() or Sleep(0) 3510 // Consider passing back the return value from SwitchToThread(). 3511 if (os::Kernel32Dll::SwitchToThreadAvailable()) { 3512 SwitchToThread(); 3513 } else { 3514 Sleep(0); 3515 } 3516 } 3517 3518 // Win32 only gives you access to seven real priorities at a time, 3519 // so we compress Java's ten down to seven. It would be better 3520 // if we dynamically adjusted relative priorities. 3521 3522 int os::java_to_os_priority[CriticalPriority + 1] = { 3523 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3524 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3525 THREAD_PRIORITY_LOWEST, // 2 3526 THREAD_PRIORITY_BELOW_NORMAL, // 3 3527 THREAD_PRIORITY_BELOW_NORMAL, // 4 3528 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3529 THREAD_PRIORITY_NORMAL, // 6 3530 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3531 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3532 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3533 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority 3534 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority 3535 }; 3536 3537 int prio_policy1[CriticalPriority + 1] = { 3538 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3539 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3540 THREAD_PRIORITY_LOWEST, // 2 3541 THREAD_PRIORITY_BELOW_NORMAL, // 3 3542 THREAD_PRIORITY_BELOW_NORMAL, // 4 3543 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3544 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3545 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3546 THREAD_PRIORITY_HIGHEST, // 8 3547 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3548 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority 3549 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority 3550 }; 3551 3552 static int prio_init() { 3553 // If ThreadPriorityPolicy is 1, switch tables 3554 if (ThreadPriorityPolicy == 1) { 3555 int i; 3556 for (i = 0; i < CriticalPriority + 1; i++) { 3557 os::java_to_os_priority[i] = prio_policy1[i]; 3558 } 3559 } 3560 if (UseCriticalJavaThreadPriority) { 3561 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 3562 } 3563 return 0; 3564 } 3565 3566 OSReturn os::set_native_priority(Thread* thread, int priority) { 3567 if (!UseThreadPriorities) return OS_OK; 3568 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3569 return ret ? OS_OK : OS_ERR; 3570 } 3571 3572 OSReturn os::get_native_priority(const Thread* const thread, 3573 int* priority_ptr) { 3574 if (!UseThreadPriorities) { 3575 *priority_ptr = java_to_os_priority[NormPriority]; 3576 return OS_OK; 3577 } 3578 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3579 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3580 assert(false, "GetThreadPriority failed"); 3581 return OS_ERR; 3582 } 3583 *priority_ptr = os_prio; 3584 return OS_OK; 3585 } 3586 3587 3588 // Hint to the underlying OS that a task switch would not be good. 3589 // Void return because it's a hint and can fail. 3590 void os::hint_no_preempt() {} 3591 3592 void os::interrupt(Thread* thread) { 3593 assert(!thread->is_Java_thread() || Thread::current() == thread || 3594 Threads_lock->owned_by_self(), 3595 "possibility of dangling Thread pointer"); 3596 3597 OSThread* osthread = thread->osthread(); 3598 osthread->set_interrupted(true); 3599 // More than one thread can get here with the same value of osthread, 3600 // resulting in multiple notifications. We do, however, want the store 3601 // to interrupted() to be visible to other threads before we post 3602 // the interrupt event. 3603 OrderAccess::release(); 3604 SetEvent(osthread->interrupt_event()); 3605 // For JSR166: unpark after setting status 3606 if (thread->is_Java_thread()) { 3607 ((JavaThread*)thread)->parker()->unpark(); 3608 } 3609 3610 ParkEvent * ev = thread->_ParkEvent; 3611 if (ev != NULL) ev->unpark(); 3612 } 3613 3614 3615 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3616 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3617 "possibility of dangling Thread pointer"); 3618 3619 OSThread* osthread = thread->osthread(); 3620 // There is no synchronization between the setting of the interrupt 3621 // and it being cleared here. It is critical - see 6535709 - that 3622 // we only clear the interrupt state, and reset the interrupt event, 3623 // if we are going to report that we were indeed interrupted - else 3624 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups 3625 // depending on the timing. By checking thread interrupt event to see 3626 // if the thread gets real interrupt thus prevent spurious wakeup. 3627 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0); 3628 if (interrupted && clear_interrupted) { 3629 osthread->set_interrupted(false); 3630 ResetEvent(osthread->interrupt_event()); 3631 } // Otherwise leave the interrupted state alone 3632 3633 return interrupted; 3634 } 3635 3636 // Get's a pc (hint) for a running thread. Currently used only for profiling. 3637 ExtendedPC os::get_thread_pc(Thread* thread) { 3638 CONTEXT context; 3639 context.ContextFlags = CONTEXT_CONTROL; 3640 HANDLE handle = thread->osthread()->thread_handle(); 3641 #ifdef _M_IA64 3642 assert(0, "Fix get_thread_pc"); 3643 return ExtendedPC(NULL); 3644 #else 3645 if (GetThreadContext(handle, &context)) { 3646 #ifdef _M_AMD64 3647 return ExtendedPC((address) context.Rip); 3648 #else 3649 return ExtendedPC((address) context.Eip); 3650 #endif 3651 } else { 3652 return ExtendedPC(NULL); 3653 } 3654 #endif 3655 } 3656 3657 // GetCurrentThreadId() returns DWORD 3658 intx os::current_thread_id() { return GetCurrentThreadId(); } 3659 3660 static int _initial_pid = 0; 3661 3662 int os::current_process_id() { 3663 return (_initial_pid ? _initial_pid : _getpid()); 3664 } 3665 3666 int os::win32::_vm_page_size = 0; 3667 int os::win32::_vm_allocation_granularity = 0; 3668 int os::win32::_processor_type = 0; 3669 // Processor level is not available on non-NT systems, use vm_version instead 3670 int os::win32::_processor_level = 0; 3671 julong os::win32::_physical_memory = 0; 3672 size_t os::win32::_default_stack_size = 0; 3673 3674 intx os::win32::_os_thread_limit = 0; 3675 volatile intx os::win32::_os_thread_count = 0; 3676 3677 bool os::win32::_is_nt = false; 3678 bool os::win32::_is_windows_2003 = false; 3679 bool os::win32::_is_windows_server = false; 3680 3681 // 6573254 3682 // Currently, the bug is observed across all the supported Windows releases, 3683 // including the latest one (as of this writing - Windows Server 2012 R2) 3684 bool os::win32::_has_exit_bug = true; 3685 bool os::win32::_has_performance_count = 0; 3686 3687 void os::win32::initialize_system_info() { 3688 SYSTEM_INFO si; 3689 GetSystemInfo(&si); 3690 _vm_page_size = si.dwPageSize; 3691 _vm_allocation_granularity = si.dwAllocationGranularity; 3692 _processor_type = si.dwProcessorType; 3693 _processor_level = si.wProcessorLevel; 3694 set_processor_count(si.dwNumberOfProcessors); 3695 3696 MEMORYSTATUSEX ms; 3697 ms.dwLength = sizeof(ms); 3698 3699 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3700 // dwMemoryLoad (% of memory in use) 3701 GlobalMemoryStatusEx(&ms); 3702 _physical_memory = ms.ullTotalPhys; 3703 3704 OSVERSIONINFOEX oi; 3705 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 3706 GetVersionEx((OSVERSIONINFO*)&oi); 3707 switch (oi.dwPlatformId) { 3708 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 3709 case VER_PLATFORM_WIN32_NT: 3710 _is_nt = true; 3711 { 3712 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3713 if (os_vers == 5002) { 3714 _is_windows_2003 = true; 3715 } 3716 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER || 3717 oi.wProductType == VER_NT_SERVER) { 3718 _is_windows_server = true; 3719 } 3720 } 3721 break; 3722 default: fatal("Unknown platform"); 3723 } 3724 3725 _default_stack_size = os::current_stack_size(); 3726 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3727 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3728 "stack size not a multiple of page size"); 3729 3730 initialize_performance_counter(); 3731 3732 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is 3733 // known to deadlock the system, if the VM issues to thread operations with 3734 // a too high frequency, e.g., such as changing the priorities. 3735 // The 6000 seems to work well - no deadlocks has been notices on the test 3736 // programs that we have seen experience this problem. 3737 if (!os::win32::is_nt()) { 3738 StarvationMonitorInterval = 6000; 3739 } 3740 } 3741 3742 3743 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, 3744 int ebuflen) { 3745 char path[MAX_PATH]; 3746 DWORD size; 3747 DWORD pathLen = (DWORD)sizeof(path); 3748 HINSTANCE result = NULL; 3749 3750 // only allow library name without path component 3751 assert(strchr(name, '\\') == NULL, "path not allowed"); 3752 assert(strchr(name, ':') == NULL, "path not allowed"); 3753 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) { 3754 jio_snprintf(ebuf, ebuflen, 3755 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name); 3756 return NULL; 3757 } 3758 3759 // search system directory 3760 if ((size = GetSystemDirectory(path, pathLen)) > 0) { 3761 if (size >= pathLen) { 3762 return NULL; // truncated 3763 } 3764 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3765 return NULL; // truncated 3766 } 3767 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3768 return result; 3769 } 3770 } 3771 3772 // try Windows directory 3773 if ((size = GetWindowsDirectory(path, pathLen)) > 0) { 3774 if (size >= pathLen) { 3775 return NULL; // truncated 3776 } 3777 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3778 return NULL; // truncated 3779 } 3780 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3781 return result; 3782 } 3783 } 3784 3785 jio_snprintf(ebuf, ebuflen, 3786 "os::win32::load_windows_dll() cannot load %s from system directories.", name); 3787 return NULL; 3788 } 3789 3790 #define EXIT_TIMEOUT PRODUCT_ONLY(1000) NOT_PRODUCT(4000) /* 1 sec in product, 4 sec in debug */ 3791 3792 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) { 3793 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect); 3794 return TRUE; 3795 } 3796 3797 int os::win32::exit_process_or_thread(Ept what, int exit_code) { 3798 // Basic approach: 3799 // - Each exiting thread registers its intent to exit and then does so. 3800 // - A thread trying to terminate the process must wait for all 3801 // threads currently exiting to complete their exit. 3802 3803 if (os::win32::has_exit_bug()) { 3804 // The array holds handles of the threads that have started exiting by calling 3805 // _endthreadex(). 3806 // Should be large enough to avoid blocking the exiting thread due to lack of 3807 // a free slot. 3808 static HANDLE handles[MAXIMUM_WAIT_OBJECTS]; 3809 static int handle_count = 0; 3810 3811 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT; 3812 static CRITICAL_SECTION crit_sect; 3813 static volatile jint process_exiting = 0; 3814 int i, j; 3815 DWORD res; 3816 HANDLE hproc, hthr; 3817 3818 // The first thread that reached this point, initializes the critical section. 3819 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) { 3820 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__); 3821 } else if (OrderAccess::load_acquire(&process_exiting) == 0) { 3822 EnterCriticalSection(&crit_sect); 3823 3824 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) { 3825 // Remove from the array those handles of the threads that have completed exiting. 3826 for (i = 0, j = 0; i < handle_count; ++i) { 3827 res = WaitForSingleObject(handles[i], 0 /* don't wait */); 3828 if (res == WAIT_TIMEOUT) { 3829 handles[j++] = handles[i]; 3830 } else { 3831 if (res == WAIT_FAILED) { 3832 warning("WaitForSingleObject failed (%u) in %s: %d\n", 3833 GetLastError(), __FILE__, __LINE__); 3834 } 3835 // Don't keep the handle, if we failed waiting for it. 3836 CloseHandle(handles[i]); 3837 } 3838 } 3839 3840 // If there's no free slot in the array of the kept handles, we'll have to 3841 // wait until at least one thread completes exiting. 3842 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) { 3843 // Raise the priority of the oldest exiting thread to increase its chances 3844 // to complete sooner. 3845 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL); 3846 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT); 3847 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) { 3848 i = (res - WAIT_OBJECT_0); 3849 handle_count = MAXIMUM_WAIT_OBJECTS - 1; 3850 for (; i < handle_count; ++i) { 3851 handles[i] = handles[i + 1]; 3852 } 3853 } else { 3854 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3855 (res == WAIT_FAILED ? "failed" : "timed out"), 3856 GetLastError(), __FILE__, __LINE__); 3857 // Don't keep handles, if we failed waiting for them. 3858 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) { 3859 CloseHandle(handles[i]); 3860 } 3861 handle_count = 0; 3862 } 3863 } 3864 3865 // Store a duplicate of the current thread handle in the array of handles. 3866 hproc = GetCurrentProcess(); 3867 hthr = GetCurrentThread(); 3868 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count], 3869 0, FALSE, DUPLICATE_SAME_ACCESS)) { 3870 warning("DuplicateHandle failed (%u) in %s: %d\n", 3871 GetLastError(), __FILE__, __LINE__); 3872 } else { 3873 ++handle_count; 3874 } 3875 3876 // The current exiting thread has stored its handle in the array, and now 3877 // should leave the critical section before calling _endthreadex(). 3878 3879 } else if (what != EPT_THREAD) { 3880 if (handle_count > 0) { 3881 // Before ending the process, make sure all the threads that had called 3882 // _endthreadex() completed. 3883 3884 // Set the priority level of the current thread to the same value as 3885 // the priority level of exiting threads. 3886 // This is to ensure it will be given a fair chance to execute if 3887 // the timeout expires. 3888 hthr = GetCurrentThread(); 3889 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL); 3890 for (i = 0; i < handle_count; ++i) { 3891 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL); 3892 } 3893 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT); 3894 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) { 3895 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3896 (res == WAIT_FAILED ? "failed" : "timed out"), 3897 GetLastError(), __FILE__, __LINE__); 3898 } 3899 for (i = 0; i < handle_count; ++i) { 3900 CloseHandle(handles[i]); 3901 } 3902 handle_count = 0; 3903 } 3904 3905 OrderAccess::release_store(&process_exiting, 1); 3906 } 3907 3908 LeaveCriticalSection(&crit_sect); 3909 } 3910 3911 if (what == EPT_THREAD) { 3912 while (OrderAccess::load_acquire(&process_exiting) != 0) { 3913 // Some other thread is about to call exit(), so we 3914 // don't let the current thread proceed to _endthreadex() 3915 SuspendThread(GetCurrentThread()); 3916 // Avoid busy-wait loop, if SuspendThread() failed. 3917 Sleep(EXIT_TIMEOUT); 3918 } 3919 } 3920 } 3921 3922 // We are here if either 3923 // - there's no 'race at exit' bug on this OS release; 3924 // - initialization of the critical section failed (unlikely); 3925 // - the current thread has stored its handle and left the critical section; 3926 // - the process-exiting thread has raised the flag and left the critical section. 3927 if (what == EPT_THREAD) { 3928 _endthreadex((unsigned)exit_code); 3929 } else if (what == EPT_PROCESS) { 3930 ::exit(exit_code); 3931 } else { 3932 _exit(exit_code); 3933 } 3934 3935 // Should not reach here 3936 return exit_code; 3937 } 3938 3939 #undef EXIT_TIMEOUT 3940 3941 void os::win32::setmode_streams() { 3942 _setmode(_fileno(stdin), _O_BINARY); 3943 _setmode(_fileno(stdout), _O_BINARY); 3944 _setmode(_fileno(stderr), _O_BINARY); 3945 } 3946 3947 3948 bool os::is_debugger_attached() { 3949 return IsDebuggerPresent() ? true : false; 3950 } 3951 3952 3953 void os::wait_for_keypress_at_exit(void) { 3954 if (PauseAtExit) { 3955 fprintf(stderr, "Press any key to continue...\n"); 3956 fgetc(stdin); 3957 } 3958 } 3959 3960 3961 int os::message_box(const char* title, const char* message) { 3962 int result = MessageBox(NULL, message, title, 3963 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 3964 return result == IDYES; 3965 } 3966 3967 int os::allocate_thread_local_storage() { 3968 return TlsAlloc(); 3969 } 3970 3971 3972 void os::free_thread_local_storage(int index) { 3973 TlsFree(index); 3974 } 3975 3976 3977 void os::thread_local_storage_at_put(int index, void* value) { 3978 TlsSetValue(index, value); 3979 assert(thread_local_storage_at(index) == value, "Just checking"); 3980 } 3981 3982 3983 void* os::thread_local_storage_at(int index) { 3984 return TlsGetValue(index); 3985 } 3986 3987 3988 #ifndef PRODUCT 3989 #ifndef _WIN64 3990 // Helpers to check whether NX protection is enabled 3991 int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 3992 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 3993 pex->ExceptionRecord->NumberParameters > 0 && 3994 pex->ExceptionRecord->ExceptionInformation[0] == 3995 EXCEPTION_INFO_EXEC_VIOLATION) { 3996 return EXCEPTION_EXECUTE_HANDLER; 3997 } 3998 return EXCEPTION_CONTINUE_SEARCH; 3999 } 4000 4001 void nx_check_protection() { 4002 // If NX is enabled we'll get an exception calling into code on the stack 4003 char code[] = { (char)0xC3 }; // ret 4004 void *code_ptr = (void *)code; 4005 __try { 4006 __asm call code_ptr 4007 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 4008 tty->print_raw_cr("NX protection detected."); 4009 } 4010 } 4011 #endif // _WIN64 4012 #endif // PRODUCT 4013 4014 // this is called _before_ the global arguments have been parsed 4015 void os::init(void) { 4016 _initial_pid = _getpid(); 4017 4018 init_random(1234567); 4019 4020 win32::initialize_system_info(); 4021 win32::setmode_streams(); 4022 init_page_sizes((size_t) win32::vm_page_size()); 4023 4024 // This may be overridden later when argument processing is done. 4025 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, 4026 os::win32::is_windows_2003()); 4027 4028 // Initialize main_process and main_thread 4029 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 4030 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 4031 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 4032 fatal("DuplicateHandle failed\n"); 4033 } 4034 main_thread_id = (int) GetCurrentThreadId(); 4035 } 4036 4037 // To install functions for atexit processing 4038 extern "C" { 4039 static void perfMemory_exit_helper() { 4040 perfMemory_exit(); 4041 } 4042 } 4043 4044 static jint initSock(); 4045 4046 // this is called _after_ the global arguments have been parsed 4047 jint os::init_2(void) { 4048 // Allocate a single page and mark it as readable for safepoint polling 4049 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 4050 guarantee(polling_page != NULL, "Reserve Failed for polling page"); 4051 4052 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 4053 guarantee(return_page != NULL, "Commit Failed for polling page"); 4054 4055 os::set_polling_page(polling_page); 4056 4057 #ifndef PRODUCT 4058 if (Verbose && PrintMiscellaneous) { 4059 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", 4060 (intptr_t)polling_page); 4061 } 4062 #endif 4063 4064 if (!UseMembar) { 4065 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE); 4066 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 4067 4068 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE); 4069 guarantee(return_page != NULL, "Commit Failed for memory serialize page"); 4070 4071 os::set_memory_serialize_page(mem_serialize_page); 4072 4073 #ifndef PRODUCT 4074 if (Verbose && PrintMiscellaneous) { 4075 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", 4076 (intptr_t)mem_serialize_page); 4077 } 4078 #endif 4079 } 4080 4081 // Setup Windows Exceptions 4082 4083 // for debugging float code generation bugs 4084 if (ForceFloatExceptions) { 4085 #ifndef _WIN64 4086 static long fp_control_word = 0; 4087 __asm { fstcw fp_control_word } 4088 // see Intel PPro Manual, Vol. 2, p 7-16 4089 const long precision = 0x20; 4090 const long underflow = 0x10; 4091 const long overflow = 0x08; 4092 const long zero_div = 0x04; 4093 const long denorm = 0x02; 4094 const long invalid = 0x01; 4095 fp_control_word |= invalid; 4096 __asm { fldcw fp_control_word } 4097 #endif 4098 } 4099 4100 // If stack_commit_size is 0, windows will reserve the default size, 4101 // but only commit a small portion of it. 4102 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 4103 size_t default_reserve_size = os::win32::default_stack_size(); 4104 size_t actual_reserve_size = stack_commit_size; 4105 if (stack_commit_size < default_reserve_size) { 4106 // If stack_commit_size == 0, we want this too 4107 actual_reserve_size = default_reserve_size; 4108 } 4109 4110 // Check minimum allowable stack size for thread creation and to initialize 4111 // the java system classes, including StackOverflowError - depends on page 4112 // size. Add a page for compiler2 recursion in main thread. 4113 // Add in 2*BytesPerWord times page size to account for VM stack during 4114 // class initialization depending on 32 or 64 bit VM. 4115 size_t min_stack_allowed = 4116 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 4117 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size(); 4118 if (actual_reserve_size < min_stack_allowed) { 4119 tty->print_cr("\nThe stack size specified is too small, " 4120 "Specify at least %dk", 4121 min_stack_allowed / K); 4122 return JNI_ERR; 4123 } 4124 4125 JavaThread::set_stack_size_at_create(stack_commit_size); 4126 4127 // Calculate theoretical max. size of Threads to guard gainst artifical 4128 // out-of-memory situations, where all available address-space has been 4129 // reserved by thread stacks. 4130 assert(actual_reserve_size != 0, "Must have a stack"); 4131 4132 // Calculate the thread limit when we should start doing Virtual Memory 4133 // banging. Currently when the threads will have used all but 200Mb of space. 4134 // 4135 // TODO: consider performing a similar calculation for commit size instead 4136 // as reserve size, since on a 64-bit platform we'll run into that more 4137 // often than running out of virtual memory space. We can use the 4138 // lower value of the two calculations as the os_thread_limit. 4139 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 4140 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 4141 4142 // at exit methods are called in the reverse order of their registration. 4143 // there is no limit to the number of functions registered. atexit does 4144 // not set errno. 4145 4146 if (PerfAllowAtExitRegistration) { 4147 // only register atexit functions if PerfAllowAtExitRegistration is set. 4148 // atexit functions can be delayed until process exit time, which 4149 // can be problematic for embedded VM situations. Embedded VMs should 4150 // call DestroyJavaVM() to assure that VM resources are released. 4151 4152 // note: perfMemory_exit_helper atexit function may be removed in 4153 // the future if the appropriate cleanup code can be added to the 4154 // VM_Exit VMOperation's doit method. 4155 if (atexit(perfMemory_exit_helper) != 0) { 4156 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 4157 } 4158 } 4159 4160 #ifndef _WIN64 4161 // Print something if NX is enabled (win32 on AMD64) 4162 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 4163 #endif 4164 4165 // initialize thread priority policy 4166 prio_init(); 4167 4168 if (UseNUMA && !ForceNUMA) { 4169 UseNUMA = false; // We don't fully support this yet 4170 } 4171 4172 if (UseNUMAInterleaving) { 4173 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag 4174 bool success = numa_interleaving_init(); 4175 if (!success) UseNUMAInterleaving = false; 4176 } 4177 4178 if (initSock() != JNI_OK) { 4179 return JNI_ERR; 4180 } 4181 4182 return JNI_OK; 4183 } 4184 4185 // Mark the polling page as unreadable 4186 void os::make_polling_page_unreadable(void) { 4187 DWORD old_status; 4188 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4189 PAGE_NOACCESS, &old_status)) { 4190 fatal("Could not disable polling page"); 4191 } 4192 } 4193 4194 // Mark the polling page as readable 4195 void os::make_polling_page_readable(void) { 4196 DWORD old_status; 4197 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4198 PAGE_READONLY, &old_status)) { 4199 fatal("Could not enable polling page"); 4200 } 4201 } 4202 4203 4204 int os::stat(const char *path, struct stat *sbuf) { 4205 char pathbuf[MAX_PATH]; 4206 if (strlen(path) > MAX_PATH - 1) { 4207 errno = ENAMETOOLONG; 4208 return -1; 4209 } 4210 os::native_path(strcpy(pathbuf, path)); 4211 int ret = ::stat(pathbuf, sbuf); 4212 if (sbuf != NULL && UseUTCFileTimestamp) { 4213 // Fix for 6539723. st_mtime returned from stat() is dependent on 4214 // the system timezone and so can return different values for the 4215 // same file if/when daylight savings time changes. This adjustment 4216 // makes sure the same timestamp is returned regardless of the TZ. 4217 // 4218 // See: 4219 // http://msdn.microsoft.com/library/ 4220 // default.asp?url=/library/en-us/sysinfo/base/ 4221 // time_zone_information_str.asp 4222 // and 4223 // http://msdn.microsoft.com/library/default.asp?url= 4224 // /library/en-us/sysinfo/base/settimezoneinformation.asp 4225 // 4226 // NOTE: there is a insidious bug here: If the timezone is changed 4227 // after the call to stat() but before 'GetTimeZoneInformation()', then 4228 // the adjustment we do here will be wrong and we'll return the wrong 4229 // value (which will likely end up creating an invalid class data 4230 // archive). Absent a better API for this, or some time zone locking 4231 // mechanism, we'll have to live with this risk. 4232 TIME_ZONE_INFORMATION tz; 4233 DWORD tzid = GetTimeZoneInformation(&tz); 4234 int daylightBias = 4235 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 4236 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 4237 } 4238 return ret; 4239 } 4240 4241 4242 #define FT2INT64(ft) \ 4243 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 4244 4245 4246 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4247 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4248 // of a thread. 4249 // 4250 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4251 // the fast estimate available on the platform. 4252 4253 // current_thread_cpu_time() is not optimized for Windows yet 4254 jlong os::current_thread_cpu_time() { 4255 // return user + sys since the cost is the same 4256 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 4257 } 4258 4259 jlong os::thread_cpu_time(Thread* thread) { 4260 // consistent with what current_thread_cpu_time() returns. 4261 return os::thread_cpu_time(thread, true /* user+sys */); 4262 } 4263 4264 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4265 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4266 } 4267 4268 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 4269 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 4270 // If this function changes, os::is_thread_cpu_time_supported() should too 4271 if (os::win32::is_nt()) { 4272 FILETIME CreationTime; 4273 FILETIME ExitTime; 4274 FILETIME KernelTime; 4275 FILETIME UserTime; 4276 4277 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime, 4278 &ExitTime, &KernelTime, &UserTime) == 0) { 4279 return -1; 4280 } else if (user_sys_cpu_time) { 4281 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 4282 } else { 4283 return FT2INT64(UserTime) * 100; 4284 } 4285 } else { 4286 return (jlong) timeGetTime() * 1000000; 4287 } 4288 } 4289 4290 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4291 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4292 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4293 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4294 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4295 } 4296 4297 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4298 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4299 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4300 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4301 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4302 } 4303 4304 bool os::is_thread_cpu_time_supported() { 4305 // see os::thread_cpu_time 4306 if (os::win32::is_nt()) { 4307 FILETIME CreationTime; 4308 FILETIME ExitTime; 4309 FILETIME KernelTime; 4310 FILETIME UserTime; 4311 4312 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime, 4313 &KernelTime, &UserTime) == 0) { 4314 return false; 4315 } else { 4316 return true; 4317 } 4318 } else { 4319 return false; 4320 } 4321 } 4322 4323 // Windows does't provide a loadavg primitive so this is stubbed out for now. 4324 // It does have primitives (PDH API) to get CPU usage and run queue length. 4325 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 4326 // If we wanted to implement loadavg on Windows, we have a few options: 4327 // 4328 // a) Query CPU usage and run queue length and "fake" an answer by 4329 // returning the CPU usage if it's under 100%, and the run queue 4330 // length otherwise. It turns out that querying is pretty slow 4331 // on Windows, on the order of 200 microseconds on a fast machine. 4332 // Note that on the Windows the CPU usage value is the % usage 4333 // since the last time the API was called (and the first call 4334 // returns 100%), so we'd have to deal with that as well. 4335 // 4336 // b) Sample the "fake" answer using a sampling thread and store 4337 // the answer in a global variable. The call to loadavg would 4338 // just return the value of the global, avoiding the slow query. 4339 // 4340 // c) Sample a better answer using exponential decay to smooth the 4341 // value. This is basically the algorithm used by UNIX kernels. 4342 // 4343 // Note that sampling thread starvation could affect both (b) and (c). 4344 int os::loadavg(double loadavg[], int nelem) { 4345 return -1; 4346 } 4347 4348 4349 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 4350 bool os::dont_yield() { 4351 return DontYieldALot; 4352 } 4353 4354 // This method is a slightly reworked copy of JDK's sysOpen 4355 // from src/windows/hpi/src/sys_api_md.c 4356 4357 int os::open(const char *path, int oflag, int mode) { 4358 char pathbuf[MAX_PATH]; 4359 4360 if (strlen(path) > MAX_PATH - 1) { 4361 errno = ENAMETOOLONG; 4362 return -1; 4363 } 4364 os::native_path(strcpy(pathbuf, path)); 4365 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 4366 } 4367 4368 FILE* os::open(int fd, const char* mode) { 4369 return ::_fdopen(fd, mode); 4370 } 4371 4372 // Is a (classpath) directory empty? 4373 bool os::dir_is_empty(const char* path) { 4374 WIN32_FIND_DATA fd; 4375 HANDLE f = FindFirstFile(path, &fd); 4376 if (f == INVALID_HANDLE_VALUE) { 4377 return true; 4378 } 4379 FindClose(f); 4380 return false; 4381 } 4382 4383 // create binary file, rewriting existing file if required 4384 int os::create_binary_file(const char* path, bool rewrite_existing) { 4385 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 4386 if (!rewrite_existing) { 4387 oflags |= _O_EXCL; 4388 } 4389 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 4390 } 4391 4392 // return current position of file pointer 4393 jlong os::current_file_offset(int fd) { 4394 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 4395 } 4396 4397 // move file pointer to the specified offset 4398 jlong os::seek_to_file_offset(int fd, jlong offset) { 4399 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 4400 } 4401 4402 4403 jlong os::lseek(int fd, jlong offset, int whence) { 4404 return (jlong) ::_lseeki64(fd, offset, whence); 4405 } 4406 4407 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 4408 OVERLAPPED ov; 4409 DWORD nread; 4410 BOOL result; 4411 4412 ZeroMemory(&ov, sizeof(ov)); 4413 ov.Offset = (DWORD)offset; 4414 ov.OffsetHigh = (DWORD)(offset >> 32); 4415 4416 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4417 4418 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov); 4419 4420 return result ? nread : 0; 4421 } 4422 4423 4424 // This method is a slightly reworked copy of JDK's sysNativePath 4425 // from src/windows/hpi/src/path_md.c 4426 4427 // Convert a pathname to native format. On win32, this involves forcing all 4428 // separators to be '\\' rather than '/' (both are legal inputs, but Win95 4429 // sometimes rejects '/') and removing redundant separators. The input path is 4430 // assumed to have been converted into the character encoding used by the local 4431 // system. Because this might be a double-byte encoding, care is taken to 4432 // treat double-byte lead characters correctly. 4433 // 4434 // This procedure modifies the given path in place, as the result is never 4435 // longer than the original. There is no error return; this operation always 4436 // succeeds. 4437 char * os::native_path(char *path) { 4438 char *src = path, *dst = path, *end = path; 4439 char *colon = NULL; // If a drive specifier is found, this will 4440 // point to the colon following the drive letter 4441 4442 // Assumption: '/', '\\', ':', and drive letters are never lead bytes 4443 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\')) 4444 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte"); 4445 4446 // Check for leading separators 4447 #define isfilesep(c) ((c) == '/' || (c) == '\\') 4448 while (isfilesep(*src)) { 4449 src++; 4450 } 4451 4452 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 4453 // Remove leading separators if followed by drive specifier. This 4454 // hack is necessary to support file URLs containing drive 4455 // specifiers (e.g., "file://c:/path"). As a side effect, 4456 // "/c:/path" can be used as an alternative to "c:/path". 4457 *dst++ = *src++; 4458 colon = dst; 4459 *dst++ = ':'; 4460 src++; 4461 } else { 4462 src = path; 4463 if (isfilesep(src[0]) && isfilesep(src[1])) { 4464 // UNC pathname: Retain first separator; leave src pointed at 4465 // second separator so that further separators will be collapsed 4466 // into the second separator. The result will be a pathname 4467 // beginning with "\\\\" followed (most likely) by a host name. 4468 src = dst = path + 1; 4469 path[0] = '\\'; // Force first separator to '\\' 4470 } 4471 } 4472 4473 end = dst; 4474 4475 // Remove redundant separators from remainder of path, forcing all 4476 // separators to be '\\' rather than '/'. Also, single byte space 4477 // characters are removed from the end of the path because those 4478 // are not legal ending characters on this operating system. 4479 // 4480 while (*src != '\0') { 4481 if (isfilesep(*src)) { 4482 *dst++ = '\\'; src++; 4483 while (isfilesep(*src)) src++; 4484 if (*src == '\0') { 4485 // Check for trailing separator 4486 end = dst; 4487 if (colon == dst - 2) break; // "z:\\" 4488 if (dst == path + 1) break; // "\\" 4489 if (dst == path + 2 && isfilesep(path[0])) { 4490 // "\\\\" is not collapsed to "\\" because "\\\\" marks the 4491 // beginning of a UNC pathname. Even though it is not, by 4492 // itself, a valid UNC pathname, we leave it as is in order 4493 // to be consistent with the path canonicalizer as well 4494 // as the win32 APIs, which treat this case as an invalid 4495 // UNC pathname rather than as an alias for the root 4496 // directory of the current drive. 4497 break; 4498 } 4499 end = --dst; // Path does not denote a root directory, so 4500 // remove trailing separator 4501 break; 4502 } 4503 end = dst; 4504 } else { 4505 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character 4506 *dst++ = *src++; 4507 if (*src) *dst++ = *src++; 4508 end = dst; 4509 } else { // Copy a single-byte character 4510 char c = *src++; 4511 *dst++ = c; 4512 // Space is not a legal ending character 4513 if (c != ' ') end = dst; 4514 } 4515 } 4516 } 4517 4518 *end = '\0'; 4519 4520 // For "z:", add "." to work around a bug in the C runtime library 4521 if (colon == dst - 1) { 4522 path[2] = '.'; 4523 path[3] = '\0'; 4524 } 4525 4526 return path; 4527 } 4528 4529 // This code is a copy of JDK's sysSetLength 4530 // from src/windows/hpi/src/sys_api_md.c 4531 4532 int os::ftruncate(int fd, jlong length) { 4533 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4534 long high = (long)(length >> 32); 4535 DWORD ret; 4536 4537 if (h == (HANDLE)(-1)) { 4538 return -1; 4539 } 4540 4541 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 4542 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 4543 return -1; 4544 } 4545 4546 if (::SetEndOfFile(h) == FALSE) { 4547 return -1; 4548 } 4549 4550 return 0; 4551 } 4552 4553 4554 // This code is a copy of JDK's sysSync 4555 // from src/windows/hpi/src/sys_api_md.c 4556 // except for the legacy workaround for a bug in Win 98 4557 4558 int os::fsync(int fd) { 4559 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 4560 4561 if ((!::FlushFileBuffers(handle)) && 4562 (GetLastError() != ERROR_ACCESS_DENIED)) { 4563 // from winerror.h 4564 return -1; 4565 } 4566 return 0; 4567 } 4568 4569 static int nonSeekAvailable(int, long *); 4570 static int stdinAvailable(int, long *); 4571 4572 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR) 4573 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO) 4574 4575 // This code is a copy of JDK's sysAvailable 4576 // from src/windows/hpi/src/sys_api_md.c 4577 4578 int os::available(int fd, jlong *bytes) { 4579 jlong cur, end; 4580 struct _stati64 stbuf64; 4581 4582 if (::_fstati64(fd, &stbuf64) >= 0) { 4583 int mode = stbuf64.st_mode; 4584 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 4585 int ret; 4586 long lpbytes; 4587 if (fd == 0) { 4588 ret = stdinAvailable(fd, &lpbytes); 4589 } else { 4590 ret = nonSeekAvailable(fd, &lpbytes); 4591 } 4592 (*bytes) = (jlong)(lpbytes); 4593 return ret; 4594 } 4595 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 4596 return FALSE; 4597 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 4598 return FALSE; 4599 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 4600 return FALSE; 4601 } 4602 *bytes = end - cur; 4603 return TRUE; 4604 } else { 4605 return FALSE; 4606 } 4607 } 4608 4609 // This code is a copy of JDK's nonSeekAvailable 4610 // from src/windows/hpi/src/sys_api_md.c 4611 4612 static int nonSeekAvailable(int fd, long *pbytes) { 4613 // This is used for available on non-seekable devices 4614 // (like both named and anonymous pipes, such as pipes 4615 // connected to an exec'd process). 4616 // Standard Input is a special case. 4617 HANDLE han; 4618 4619 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 4620 return FALSE; 4621 } 4622 4623 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 4624 // PeekNamedPipe fails when at EOF. In that case we 4625 // simply make *pbytes = 0 which is consistent with the 4626 // behavior we get on Solaris when an fd is at EOF. 4627 // The only alternative is to raise an Exception, 4628 // which isn't really warranted. 4629 // 4630 if (::GetLastError() != ERROR_BROKEN_PIPE) { 4631 return FALSE; 4632 } 4633 *pbytes = 0; 4634 } 4635 return TRUE; 4636 } 4637 4638 #define MAX_INPUT_EVENTS 2000 4639 4640 // This code is a copy of JDK's stdinAvailable 4641 // from src/windows/hpi/src/sys_api_md.c 4642 4643 static int stdinAvailable(int fd, long *pbytes) { 4644 HANDLE han; 4645 DWORD numEventsRead = 0; // Number of events read from buffer 4646 DWORD numEvents = 0; // Number of events in buffer 4647 DWORD i = 0; // Loop index 4648 DWORD curLength = 0; // Position marker 4649 DWORD actualLength = 0; // Number of bytes readable 4650 BOOL error = FALSE; // Error holder 4651 INPUT_RECORD *lpBuffer; // Pointer to records of input events 4652 4653 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4654 return FALSE; 4655 } 4656 4657 // Construct an array of input records in the console buffer 4658 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4659 if (error == 0) { 4660 return nonSeekAvailable(fd, pbytes); 4661 } 4662 4663 // lpBuffer must fit into 64K or else PeekConsoleInput fails 4664 if (numEvents > MAX_INPUT_EVENTS) { 4665 numEvents = MAX_INPUT_EVENTS; 4666 } 4667 4668 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal); 4669 if (lpBuffer == NULL) { 4670 return FALSE; 4671 } 4672 4673 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4674 if (error == 0) { 4675 os::free(lpBuffer); 4676 return FALSE; 4677 } 4678 4679 // Examine input records for the number of bytes available 4680 for (i=0; i<numEvents; i++) { 4681 if (lpBuffer[i].EventType == KEY_EVENT) { 4682 4683 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4684 &(lpBuffer[i].Event); 4685 if (keyRecord->bKeyDown == TRUE) { 4686 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4687 curLength++; 4688 if (*keyPressed == '\r') { 4689 actualLength = curLength; 4690 } 4691 } 4692 } 4693 } 4694 4695 if (lpBuffer != NULL) { 4696 os::free(lpBuffer); 4697 } 4698 4699 *pbytes = (long) actualLength; 4700 return TRUE; 4701 } 4702 4703 // Map a block of memory. 4704 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4705 char *addr, size_t bytes, bool read_only, 4706 bool allow_exec) { 4707 HANDLE hFile; 4708 char* base; 4709 4710 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4711 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4712 if (hFile == NULL) { 4713 if (PrintMiscellaneous && Verbose) { 4714 DWORD err = GetLastError(); 4715 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err); 4716 } 4717 return NULL; 4718 } 4719 4720 if (allow_exec) { 4721 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4722 // unless it comes from a PE image (which the shared archive is not.) 4723 // Even VirtualProtect refuses to give execute access to mapped memory 4724 // that was not previously executable. 4725 // 4726 // Instead, stick the executable region in anonymous memory. Yuck. 4727 // Penalty is that ~4 pages will not be shareable - in the future 4728 // we might consider DLLizing the shared archive with a proper PE 4729 // header so that mapping executable + sharing is possible. 4730 4731 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4732 PAGE_READWRITE); 4733 if (base == NULL) { 4734 if (PrintMiscellaneous && Verbose) { 4735 DWORD err = GetLastError(); 4736 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 4737 } 4738 CloseHandle(hFile); 4739 return NULL; 4740 } 4741 4742 DWORD bytes_read; 4743 OVERLAPPED overlapped; 4744 overlapped.Offset = (DWORD)file_offset; 4745 overlapped.OffsetHigh = 0; 4746 overlapped.hEvent = NULL; 4747 // ReadFile guarantees that if the return value is true, the requested 4748 // number of bytes were read before returning. 4749 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 4750 if (!res) { 4751 if (PrintMiscellaneous && Verbose) { 4752 DWORD err = GetLastError(); 4753 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 4754 } 4755 release_memory(base, bytes); 4756 CloseHandle(hFile); 4757 return NULL; 4758 } 4759 } else { 4760 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 4761 NULL /* file_name */); 4762 if (hMap == NULL) { 4763 if (PrintMiscellaneous && Verbose) { 4764 DWORD err = GetLastError(); 4765 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err); 4766 } 4767 CloseHandle(hFile); 4768 return NULL; 4769 } 4770 4771 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 4772 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 4773 (DWORD)bytes, addr); 4774 if (base == NULL) { 4775 if (PrintMiscellaneous && Verbose) { 4776 DWORD err = GetLastError(); 4777 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 4778 } 4779 CloseHandle(hMap); 4780 CloseHandle(hFile); 4781 return NULL; 4782 } 4783 4784 if (CloseHandle(hMap) == 0) { 4785 if (PrintMiscellaneous && Verbose) { 4786 DWORD err = GetLastError(); 4787 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 4788 } 4789 CloseHandle(hFile); 4790 return base; 4791 } 4792 } 4793 4794 if (allow_exec) { 4795 DWORD old_protect; 4796 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 4797 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 4798 4799 if (!res) { 4800 if (PrintMiscellaneous && Verbose) { 4801 DWORD err = GetLastError(); 4802 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 4803 } 4804 // Don't consider this a hard error, on IA32 even if the 4805 // VirtualProtect fails, we should still be able to execute 4806 CloseHandle(hFile); 4807 return base; 4808 } 4809 } 4810 4811 if (CloseHandle(hFile) == 0) { 4812 if (PrintMiscellaneous && Verbose) { 4813 DWORD err = GetLastError(); 4814 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 4815 } 4816 return base; 4817 } 4818 4819 return base; 4820 } 4821 4822 4823 // Remap a block of memory. 4824 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4825 char *addr, size_t bytes, bool read_only, 4826 bool allow_exec) { 4827 // This OS does not allow existing memory maps to be remapped so we 4828 // have to unmap the memory before we remap it. 4829 if (!os::unmap_memory(addr, bytes)) { 4830 return NULL; 4831 } 4832 4833 // There is a very small theoretical window between the unmap_memory() 4834 // call above and the map_memory() call below where a thread in native 4835 // code may be able to access an address that is no longer mapped. 4836 4837 return os::map_memory(fd, file_name, file_offset, addr, bytes, 4838 read_only, allow_exec); 4839 } 4840 4841 4842 // Unmap a block of memory. 4843 // Returns true=success, otherwise false. 4844 4845 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4846 BOOL result = UnmapViewOfFile(addr); 4847 if (result == 0) { 4848 if (PrintMiscellaneous && Verbose) { 4849 DWORD err = GetLastError(); 4850 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 4851 } 4852 return false; 4853 } 4854 return true; 4855 } 4856 4857 void os::pause() { 4858 char filename[MAX_PATH]; 4859 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4860 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4861 } else { 4862 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4863 } 4864 4865 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4866 if (fd != -1) { 4867 struct stat buf; 4868 ::close(fd); 4869 while (::stat(filename, &buf) == 0) { 4870 Sleep(100); 4871 } 4872 } else { 4873 jio_fprintf(stderr, 4874 "Could not open pause file '%s', continuing immediately.\n", filename); 4875 } 4876 } 4877 4878 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 4879 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 4880 } 4881 4882 // See the caveats for this class in os_windows.hpp 4883 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back 4884 // into this method and returns false. If no OS EXCEPTION was raised, returns 4885 // true. 4886 // The callback is supposed to provide the method that should be protected. 4887 // 4888 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 4889 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); 4890 assert(!WatcherThread::watcher_thread()->has_crash_protection(), 4891 "crash_protection already set?"); 4892 4893 bool success = true; 4894 __try { 4895 WatcherThread::watcher_thread()->set_crash_protection(this); 4896 cb.call(); 4897 } __except(EXCEPTION_EXECUTE_HANDLER) { 4898 // only for protection, nothing to do 4899 success = false; 4900 } 4901 WatcherThread::watcher_thread()->set_crash_protection(NULL); 4902 return success; 4903 } 4904 4905 // An Event wraps a win32 "CreateEvent" kernel handle. 4906 // 4907 // We have a number of choices regarding "CreateEvent" win32 handle leakage: 4908 // 4909 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 4910 // field, and call CloseHandle() on the win32 event handle. Unpark() would 4911 // need to be modified to tolerate finding a NULL (invalid) win32 event handle. 4912 // In addition, an unpark() operation might fetch the handle field, but the 4913 // event could recycle between the fetch and the SetEvent() operation. 4914 // SetEvent() would either fail because the handle was invalid, or inadvertently work, 4915 // as the win32 handle value had been recycled. In an ideal world calling SetEvent() 4916 // on an stale but recycled handle would be harmless, but in practice this might 4917 // confuse other non-Sun code, so it's not a viable approach. 4918 // 4919 // 2: Once a win32 event handle is associated with an Event, it remains associated 4920 // with the Event. The event handle is never closed. This could be construed 4921 // as handle leakage, but only up to the maximum # of threads that have been extant 4922 // at any one time. This shouldn't be an issue, as windows platforms typically 4923 // permit a process to have hundreds of thousands of open handles. 4924 // 4925 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 4926 // and release unused handles. 4927 // 4928 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 4929 // It's not clear, however, that we wouldn't be trading one type of leak for another. 4930 // 4931 // 5. Use an RCU-like mechanism (Read-Copy Update). 4932 // Or perhaps something similar to Maged Michael's "Hazard pointers". 4933 // 4934 // We use (2). 4935 // 4936 // TODO-FIXME: 4937 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 4938 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 4939 // to recover from (or at least detect) the dreaded Windows 841176 bug. 4940 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 4941 // into a single win32 CreateEvent() handle. 4942 // 4943 // Assumption: 4944 // Only one parker can exist on an event, which is why we allocate 4945 // them per-thread. Multiple unparkers can coexist. 4946 // 4947 // _Event transitions in park() 4948 // -1 => -1 : illegal 4949 // 1 => 0 : pass - return immediately 4950 // 0 => -1 : block; then set _Event to 0 before returning 4951 // 4952 // _Event transitions in unpark() 4953 // 0 => 1 : just return 4954 // 1 => 1 : just return 4955 // -1 => either 0 or 1; must signal target thread 4956 // That is, we can safely transition _Event from -1 to either 4957 // 0 or 1. 4958 // 4959 // _Event serves as a restricted-range semaphore. 4960 // -1 : thread is blocked, i.e. there is a waiter 4961 // 0 : neutral: thread is running or ready, 4962 // could have been signaled after a wait started 4963 // 1 : signaled - thread is running or ready 4964 // 4965 // Another possible encoding of _Event would be with 4966 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 4967 // 4968 4969 int os::PlatformEvent::park(jlong Millis) { 4970 // Transitions for _Event: 4971 // -1 => -1 : illegal 4972 // 1 => 0 : pass - return immediately 4973 // 0 => -1 : block; then set _Event to 0 before returning 4974 4975 guarantee(_ParkHandle != NULL , "Invariant"); 4976 guarantee(Millis > 0 , "Invariant"); 4977 4978 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 4979 // the initial park() operation. 4980 // Consider: use atomic decrement instead of CAS-loop 4981 4982 int v; 4983 for (;;) { 4984 v = _Event; 4985 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4986 } 4987 guarantee((v == 0) || (v == 1), "invariant"); 4988 if (v != 0) return OS_OK; 4989 4990 // Do this the hard way by blocking ... 4991 // TODO: consider a brief spin here, gated on the success of recent 4992 // spin attempts by this thread. 4993 // 4994 // We decompose long timeouts into series of shorter timed waits. 4995 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 4996 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 4997 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 4998 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 4999 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 5000 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 5001 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 5002 // for the already waited time. This policy does not admit any new outcomes. 5003 // In the future, however, we might want to track the accumulated wait time and 5004 // adjust Millis accordingly if we encounter a spurious wakeup. 5005 5006 const int MAXTIMEOUT = 0x10000000; 5007 DWORD rv = WAIT_TIMEOUT; 5008 while (_Event < 0 && Millis > 0) { 5009 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT) 5010 if (Millis > MAXTIMEOUT) { 5011 prd = MAXTIMEOUT; 5012 } 5013 rv = ::WaitForSingleObject(_ParkHandle, prd); 5014 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed"); 5015 if (rv == WAIT_TIMEOUT) { 5016 Millis -= prd; 5017 } 5018 } 5019 v = _Event; 5020 _Event = 0; 5021 // see comment at end of os::PlatformEvent::park() below: 5022 OrderAccess::fence(); 5023 // If we encounter a nearly simultanous timeout expiry and unpark() 5024 // we return OS_OK indicating we awoke via unpark(). 5025 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 5026 return (v >= 0) ? OS_OK : OS_TIMEOUT; 5027 } 5028 5029 void os::PlatformEvent::park() { 5030 // Transitions for _Event: 5031 // -1 => -1 : illegal 5032 // 1 => 0 : pass - return immediately 5033 // 0 => -1 : block; then set _Event to 0 before returning 5034 5035 guarantee(_ParkHandle != NULL, "Invariant"); 5036 // Invariant: Only the thread associated with the Event/PlatformEvent 5037 // may call park(). 5038 // Consider: use atomic decrement instead of CAS-loop 5039 int v; 5040 for (;;) { 5041 v = _Event; 5042 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5043 } 5044 guarantee((v == 0) || (v == 1), "invariant"); 5045 if (v != 0) return; 5046 5047 // Do this the hard way by blocking ... 5048 // TODO: consider a brief spin here, gated on the success of recent 5049 // spin attempts by this thread. 5050 while (_Event < 0) { 5051 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE); 5052 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed"); 5053 } 5054 5055 // Usually we'll find _Event == 0 at this point, but as 5056 // an optional optimization we clear it, just in case can 5057 // multiple unpark() operations drove _Event up to 1. 5058 _Event = 0; 5059 OrderAccess::fence(); 5060 guarantee(_Event >= 0, "invariant"); 5061 } 5062 5063 void os::PlatformEvent::unpark() { 5064 guarantee(_ParkHandle != NULL, "Invariant"); 5065 5066 // Transitions for _Event: 5067 // 0 => 1 : just return 5068 // 1 => 1 : just return 5069 // -1 => either 0 or 1; must signal target thread 5070 // That is, we can safely transition _Event from -1 to either 5071 // 0 or 1. 5072 // See also: "Semaphores in Plan 9" by Mullender & Cox 5073 // 5074 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5075 // that it will take two back-to-back park() calls for the owning 5076 // thread to block. This has the benefit of forcing a spurious return 5077 // from the first park() call after an unpark() call which will help 5078 // shake out uses of park() and unpark() without condition variables. 5079 5080 if (Atomic::xchg(1, &_Event) >= 0) return; 5081 5082 ::SetEvent(_ParkHandle); 5083 } 5084 5085 5086 // JSR166 5087 // ------------------------------------------------------- 5088 5089 // The Windows implementation of Park is very straightforward: Basic 5090 // operations on Win32 Events turn out to have the right semantics to 5091 // use them directly. We opportunistically resuse the event inherited 5092 // from Monitor. 5093 5094 void Parker::park(bool isAbsolute, jlong time) { 5095 guarantee(_ParkEvent != NULL, "invariant"); 5096 // First, demultiplex/decode time arguments 5097 if (time < 0) { // don't wait 5098 return; 5099 } else if (time == 0 && !isAbsolute) { 5100 time = INFINITE; 5101 } else if (isAbsolute) { 5102 time -= os::javaTimeMillis(); // convert to relative time 5103 if (time <= 0) { // already elapsed 5104 return; 5105 } 5106 } else { // relative 5107 time /= 1000000; // Must coarsen from nanos to millis 5108 if (time == 0) { // Wait for the minimal time unit if zero 5109 time = 1; 5110 } 5111 } 5112 5113 JavaThread* thread = (JavaThread*)(Thread::current()); 5114 assert(thread->is_Java_thread(), "Must be JavaThread"); 5115 JavaThread *jt = (JavaThread *)thread; 5116 5117 // Don't wait if interrupted or already triggered 5118 if (Thread::is_interrupted(thread, false) || 5119 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 5120 ResetEvent(_ParkEvent); 5121 return; 5122 } else { 5123 ThreadBlockInVM tbivm(jt); 5124 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5125 jt->set_suspend_equivalent(); 5126 5127 WaitForSingleObject(_ParkEvent, time); 5128 ResetEvent(_ParkEvent); 5129 5130 // If externally suspended while waiting, re-suspend 5131 if (jt->handle_special_suspend_equivalent_condition()) { 5132 jt->java_suspend_self(); 5133 } 5134 } 5135 } 5136 5137 void Parker::unpark() { 5138 guarantee(_ParkEvent != NULL, "invariant"); 5139 SetEvent(_ParkEvent); 5140 } 5141 5142 // Run the specified command in a separate process. Return its exit value, 5143 // or -1 on failure (e.g. can't create a new process). 5144 int os::fork_and_exec(char* cmd) { 5145 STARTUPINFO si; 5146 PROCESS_INFORMATION pi; 5147 5148 memset(&si, 0, sizeof(si)); 5149 si.cb = sizeof(si); 5150 memset(&pi, 0, sizeof(pi)); 5151 BOOL rslt = CreateProcess(NULL, // executable name - use command line 5152 cmd, // command line 5153 NULL, // process security attribute 5154 NULL, // thread security attribute 5155 TRUE, // inherits system handles 5156 0, // no creation flags 5157 NULL, // use parent's environment block 5158 NULL, // use parent's starting directory 5159 &si, // (in) startup information 5160 &pi); // (out) process information 5161 5162 if (rslt) { 5163 // Wait until child process exits. 5164 WaitForSingleObject(pi.hProcess, INFINITE); 5165 5166 DWORD exit_code; 5167 GetExitCodeProcess(pi.hProcess, &exit_code); 5168 5169 // Close process and thread handles. 5170 CloseHandle(pi.hProcess); 5171 CloseHandle(pi.hThread); 5172 5173 return (int)exit_code; 5174 } else { 5175 return -1; 5176 } 5177 } 5178 5179 //-------------------------------------------------------------------------------------------------- 5180 // Non-product code 5181 5182 static int mallocDebugIntervalCounter = 0; 5183 static int mallocDebugCounter = 0; 5184 bool os::check_heap(bool force) { 5185 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 5186 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 5187 // Note: HeapValidate executes two hardware breakpoints when it finds something 5188 // wrong; at these points, eax contains the address of the offending block (I think). 5189 // To get to the exlicit error message(s) below, just continue twice. 5190 HANDLE heap = GetProcessHeap(); 5191 5192 // If we fail to lock the heap, then gflags.exe has been used 5193 // or some other special heap flag has been set that prevents 5194 // locking. We don't try to walk a heap we can't lock. 5195 if (HeapLock(heap) != 0) { 5196 PROCESS_HEAP_ENTRY phe; 5197 phe.lpData = NULL; 5198 while (HeapWalk(heap, &phe) != 0) { 5199 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 5200 !HeapValidate(heap, 0, phe.lpData)) { 5201 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 5202 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 5203 fatal("corrupted C heap"); 5204 } 5205 } 5206 DWORD err = GetLastError(); 5207 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 5208 fatal(err_msg("heap walk aborted with error %d", err)); 5209 } 5210 HeapUnlock(heap); 5211 } 5212 mallocDebugIntervalCounter = 0; 5213 } 5214 return true; 5215 } 5216 5217 5218 bool os::find(address addr, outputStream* st) { 5219 // Nothing yet 5220 return false; 5221 } 5222 5223 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 5224 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 5225 5226 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 5227 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow(); 5228 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 5229 address addr = (address) exceptionRecord->ExceptionInformation[1]; 5230 5231 if (os::is_memory_serialize_page(thread, addr)) { 5232 return EXCEPTION_CONTINUE_EXECUTION; 5233 } 5234 } 5235 5236 return EXCEPTION_CONTINUE_SEARCH; 5237 } 5238 5239 // We don't build a headless jre for Windows 5240 bool os::is_headless_jre() { return false; } 5241 5242 static jint initSock() { 5243 WSADATA wsadata; 5244 5245 if (!os::WinSock2Dll::WinSock2Available()) { 5246 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n", 5247 ::GetLastError()); 5248 return JNI_ERR; 5249 } 5250 5251 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) { 5252 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n", 5253 ::GetLastError()); 5254 return JNI_ERR; 5255 } 5256 return JNI_OK; 5257 } 5258 5259 struct hostent* os::get_host_by_name(char* name) { 5260 return (struct hostent*)os::WinSock2Dll::gethostbyname(name); 5261 } 5262 5263 int os::socket_close(int fd) { 5264 return ::closesocket(fd); 5265 } 5266 5267 int os::socket(int domain, int type, int protocol) { 5268 return ::socket(domain, type, protocol); 5269 } 5270 5271 int os::connect(int fd, struct sockaddr* him, socklen_t len) { 5272 return ::connect(fd, him, len); 5273 } 5274 5275 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5276 return ::recv(fd, buf, (int)nBytes, flags); 5277 } 5278 5279 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5280 return ::send(fd, buf, (int)nBytes, flags); 5281 } 5282 5283 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5284 return ::send(fd, buf, (int)nBytes, flags); 5285 } 5286 5287 // WINDOWS CONTEXT Flags for THREAD_SAMPLING 5288 #if defined(IA32) 5289 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS) 5290 #elif defined (AMD64) 5291 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT) 5292 #endif 5293 5294 // returns true if thread could be suspended, 5295 // false otherwise 5296 static bool do_suspend(HANDLE* h) { 5297 if (h != NULL) { 5298 if (SuspendThread(*h) != ~0) { 5299 return true; 5300 } 5301 } 5302 return false; 5303 } 5304 5305 // resume the thread 5306 // calling resume on an active thread is a no-op 5307 static void do_resume(HANDLE* h) { 5308 if (h != NULL) { 5309 ResumeThread(*h); 5310 } 5311 } 5312 5313 // retrieve a suspend/resume context capable handle 5314 // from the tid. Caller validates handle return value. 5315 void get_thread_handle_for_extended_context(HANDLE* h, 5316 OSThread::thread_id_t tid) { 5317 if (h != NULL) { 5318 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid); 5319 } 5320 } 5321 5322 // Thread sampling implementation 5323 // 5324 void os::SuspendedThreadTask::internal_do_task() { 5325 CONTEXT ctxt; 5326 HANDLE h = NULL; 5327 5328 // get context capable handle for thread 5329 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id()); 5330 5331 // sanity 5332 if (h == NULL || h == INVALID_HANDLE_VALUE) { 5333 return; 5334 } 5335 5336 // suspend the thread 5337 if (do_suspend(&h)) { 5338 ctxt.ContextFlags = sampling_context_flags; 5339 // get thread context 5340 GetThreadContext(h, &ctxt); 5341 SuspendedThreadTaskContext context(_thread, &ctxt); 5342 // pass context to Thread Sampling impl 5343 do_task(context); 5344 // resume thread 5345 do_resume(&h); 5346 } 5347 5348 // close handle 5349 CloseHandle(h); 5350 } 5351 5352 5353 // Kernel32 API 5354 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void); 5355 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD); 5356 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG); 5357 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG); 5358 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG); 5359 5360 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL; 5361 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL; 5362 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL; 5363 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL; 5364 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL; 5365 5366 5367 BOOL os::Kernel32Dll::initialized = FALSE; 5368 SIZE_T os::Kernel32Dll::GetLargePageMinimum() { 5369 assert(initialized && _GetLargePageMinimum != NULL, 5370 "GetLargePageMinimumAvailable() not yet called"); 5371 return _GetLargePageMinimum(); 5372 } 5373 5374 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() { 5375 if (!initialized) { 5376 initialize(); 5377 } 5378 return _GetLargePageMinimum != NULL; 5379 } 5380 5381 BOOL os::Kernel32Dll::NumaCallsAvailable() { 5382 if (!initialized) { 5383 initialize(); 5384 } 5385 return _VirtualAllocExNuma != NULL; 5386 } 5387 5388 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, 5389 SIZE_T bytes, DWORD flags, 5390 DWORD prot, DWORD node) { 5391 assert(initialized && _VirtualAllocExNuma != NULL, 5392 "NUMACallsAvailable() not yet called"); 5393 5394 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node); 5395 } 5396 5397 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) { 5398 assert(initialized && _GetNumaHighestNodeNumber != NULL, 5399 "NUMACallsAvailable() not yet called"); 5400 5401 return _GetNumaHighestNodeNumber(ptr_highest_node_number); 5402 } 5403 5404 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, 5405 PULONGLONG proc_mask) { 5406 assert(initialized && _GetNumaNodeProcessorMask != NULL, 5407 "NUMACallsAvailable() not yet called"); 5408 5409 return _GetNumaNodeProcessorMask(node, proc_mask); 5410 } 5411 5412 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip, 5413 ULONG FrameToCapture, 5414 PVOID* BackTrace, 5415 PULONG BackTraceHash) { 5416 if (!initialized) { 5417 initialize(); 5418 } 5419 5420 if (_RtlCaptureStackBackTrace != NULL) { 5421 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture, 5422 BackTrace, BackTraceHash); 5423 } else { 5424 return 0; 5425 } 5426 } 5427 5428 void os::Kernel32Dll::initializeCommon() { 5429 if (!initialized) { 5430 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5431 assert(handle != NULL, "Just check"); 5432 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum"); 5433 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma"); 5434 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber"); 5435 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask"); 5436 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace"); 5437 initialized = TRUE; 5438 } 5439 } 5440 5441 5442 5443 #ifndef JDK6_OR_EARLIER 5444 5445 void os::Kernel32Dll::initialize() { 5446 initializeCommon(); 5447 } 5448 5449 5450 // Kernel32 API 5451 inline BOOL os::Kernel32Dll::SwitchToThread() { 5452 return ::SwitchToThread(); 5453 } 5454 5455 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5456 return true; 5457 } 5458 5459 // Help tools 5460 inline BOOL os::Kernel32Dll::HelpToolsAvailable() { 5461 return true; 5462 } 5463 5464 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5465 DWORD th32ProcessId) { 5466 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5467 } 5468 5469 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot, 5470 LPMODULEENTRY32 lpme) { 5471 return ::Module32First(hSnapshot, lpme); 5472 } 5473 5474 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5475 LPMODULEENTRY32 lpme) { 5476 return ::Module32Next(hSnapshot, lpme); 5477 } 5478 5479 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5480 ::GetNativeSystemInfo(lpSystemInfo); 5481 } 5482 5483 // PSAPI API 5484 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, 5485 HMODULE *lpModule, DWORD cb, 5486 LPDWORD lpcbNeeded) { 5487 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5488 } 5489 5490 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, 5491 HMODULE hModule, 5492 LPTSTR lpFilename, 5493 DWORD nSize) { 5494 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5495 } 5496 5497 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, 5498 HMODULE hModule, 5499 LPMODULEINFO lpmodinfo, 5500 DWORD cb) { 5501 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5502 } 5503 5504 inline BOOL os::PSApiDll::PSApiAvailable() { 5505 return true; 5506 } 5507 5508 5509 // WinSock2 API 5510 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, 5511 LPWSADATA lpWSAData) { 5512 return ::WSAStartup(wVersionRequested, lpWSAData); 5513 } 5514 5515 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5516 return ::gethostbyname(name); 5517 } 5518 5519 inline BOOL os::WinSock2Dll::WinSock2Available() { 5520 return true; 5521 } 5522 5523 // Advapi API 5524 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5525 BOOL DisableAllPrivileges, 5526 PTOKEN_PRIVILEGES NewState, 5527 DWORD BufferLength, 5528 PTOKEN_PRIVILEGES PreviousState, 5529 PDWORD ReturnLength) { 5530 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5531 BufferLength, PreviousState, ReturnLength); 5532 } 5533 5534 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5535 DWORD DesiredAccess, 5536 PHANDLE TokenHandle) { 5537 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5538 } 5539 5540 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5541 LPCTSTR lpName, 5542 PLUID lpLuid) { 5543 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5544 } 5545 5546 inline BOOL os::Advapi32Dll::AdvapiAvailable() { 5547 return true; 5548 } 5549 5550 void* os::get_default_process_handle() { 5551 return (void*)GetModuleHandle(NULL); 5552 } 5553 5554 // Builds a platform dependent Agent_OnLoad_<lib_name> function name 5555 // which is used to find statically linked in agents. 5556 // Additionally for windows, takes into account __stdcall names. 5557 // Parameters: 5558 // sym_name: Symbol in library we are looking for 5559 // lib_name: Name of library to look in, NULL for shared libs. 5560 // is_absolute_path == true if lib_name is absolute path to agent 5561 // such as "C:/a/b/L.dll" 5562 // == false if only the base name of the library is passed in 5563 // such as "L" 5564 char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 5565 bool is_absolute_path) { 5566 char *agent_entry_name; 5567 size_t len; 5568 size_t name_len; 5569 size_t prefix_len = strlen(JNI_LIB_PREFIX); 5570 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 5571 const char *start; 5572 5573 if (lib_name != NULL) { 5574 len = name_len = strlen(lib_name); 5575 if (is_absolute_path) { 5576 // Need to strip path, prefix and suffix 5577 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 5578 lib_name = ++start; 5579 } else { 5580 // Need to check for drive prefix 5581 if ((start = strchr(lib_name, ':')) != NULL) { 5582 lib_name = ++start; 5583 } 5584 } 5585 if (len <= (prefix_len + suffix_len)) { 5586 return NULL; 5587 } 5588 lib_name += prefix_len; 5589 name_len = strlen(lib_name) - suffix_len; 5590 } 5591 } 5592 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 5593 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 5594 if (agent_entry_name == NULL) { 5595 return NULL; 5596 } 5597 if (lib_name != NULL) { 5598 const char *p = strrchr(sym_name, '@'); 5599 if (p != NULL && p != sym_name) { 5600 // sym_name == _Agent_OnLoad@XX 5601 strncpy(agent_entry_name, sym_name, (p - sym_name)); 5602 agent_entry_name[(p-sym_name)] = '\0'; 5603 // agent_entry_name == _Agent_OnLoad 5604 strcat(agent_entry_name, "_"); 5605 strncat(agent_entry_name, lib_name, name_len); 5606 strcat(agent_entry_name, p); 5607 // agent_entry_name == _Agent_OnLoad_lib_name@XX 5608 } else { 5609 strcpy(agent_entry_name, sym_name); 5610 strcat(agent_entry_name, "_"); 5611 strncat(agent_entry_name, lib_name, name_len); 5612 } 5613 } else { 5614 strcpy(agent_entry_name, sym_name); 5615 } 5616 return agent_entry_name; 5617 } 5618 5619 #else 5620 // Kernel32 API 5621 typedef BOOL (WINAPI* SwitchToThread_Fn)(void); 5622 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD); 5623 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32); 5624 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32); 5625 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO); 5626 5627 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL; 5628 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL; 5629 Module32First_Fn os::Kernel32Dll::_Module32First = NULL; 5630 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL; 5631 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL; 5632 5633 void os::Kernel32Dll::initialize() { 5634 if (!initialized) { 5635 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5636 assert(handle != NULL, "Just check"); 5637 5638 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread"); 5639 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn) 5640 ::GetProcAddress(handle, "CreateToolhelp32Snapshot"); 5641 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First"); 5642 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next"); 5643 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo"); 5644 initializeCommon(); // resolve the functions that always need resolving 5645 5646 initialized = TRUE; 5647 } 5648 } 5649 5650 BOOL os::Kernel32Dll::SwitchToThread() { 5651 assert(initialized && _SwitchToThread != NULL, 5652 "SwitchToThreadAvailable() not yet called"); 5653 return _SwitchToThread(); 5654 } 5655 5656 5657 BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5658 if (!initialized) { 5659 initialize(); 5660 } 5661 return _SwitchToThread != NULL; 5662 } 5663 5664 // Help tools 5665 BOOL os::Kernel32Dll::HelpToolsAvailable() { 5666 if (!initialized) { 5667 initialize(); 5668 } 5669 return _CreateToolhelp32Snapshot != NULL && 5670 _Module32First != NULL && 5671 _Module32Next != NULL; 5672 } 5673 5674 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5675 DWORD th32ProcessId) { 5676 assert(initialized && _CreateToolhelp32Snapshot != NULL, 5677 "HelpToolsAvailable() not yet called"); 5678 5679 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5680 } 5681 5682 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5683 assert(initialized && _Module32First != NULL, 5684 "HelpToolsAvailable() not yet called"); 5685 5686 return _Module32First(hSnapshot, lpme); 5687 } 5688 5689 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5690 LPMODULEENTRY32 lpme) { 5691 assert(initialized && _Module32Next != NULL, 5692 "HelpToolsAvailable() not yet called"); 5693 5694 return _Module32Next(hSnapshot, lpme); 5695 } 5696 5697 5698 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() { 5699 if (!initialized) { 5700 initialize(); 5701 } 5702 return _GetNativeSystemInfo != NULL; 5703 } 5704 5705 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5706 assert(initialized && _GetNativeSystemInfo != NULL, 5707 "GetNativeSystemInfoAvailable() not yet called"); 5708 5709 _GetNativeSystemInfo(lpSystemInfo); 5710 } 5711 5712 // PSAPI API 5713 5714 5715 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD); 5716 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD); 5717 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD); 5718 5719 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL; 5720 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL; 5721 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL; 5722 BOOL os::PSApiDll::initialized = FALSE; 5723 5724 void os::PSApiDll::initialize() { 5725 if (!initialized) { 5726 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0); 5727 if (handle != NULL) { 5728 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle, 5729 "EnumProcessModules"); 5730 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle, 5731 "GetModuleFileNameExA"); 5732 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle, 5733 "GetModuleInformation"); 5734 } 5735 initialized = TRUE; 5736 } 5737 } 5738 5739 5740 5741 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, 5742 DWORD cb, LPDWORD lpcbNeeded) { 5743 assert(initialized && _EnumProcessModules != NULL, 5744 "PSApiAvailable() not yet called"); 5745 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5746 } 5747 5748 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, 5749 LPTSTR lpFilename, DWORD nSize) { 5750 assert(initialized && _GetModuleFileNameEx != NULL, 5751 "PSApiAvailable() not yet called"); 5752 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5753 } 5754 5755 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, 5756 LPMODULEINFO lpmodinfo, DWORD cb) { 5757 assert(initialized && _GetModuleInformation != NULL, 5758 "PSApiAvailable() not yet called"); 5759 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5760 } 5761 5762 BOOL os::PSApiDll::PSApiAvailable() { 5763 if (!initialized) { 5764 initialize(); 5765 } 5766 return _EnumProcessModules != NULL && 5767 _GetModuleFileNameEx != NULL && 5768 _GetModuleInformation != NULL; 5769 } 5770 5771 5772 // WinSock2 API 5773 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA); 5774 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...); 5775 5776 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL; 5777 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL; 5778 BOOL os::WinSock2Dll::initialized = FALSE; 5779 5780 void os::WinSock2Dll::initialize() { 5781 if (!initialized) { 5782 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0); 5783 if (handle != NULL) { 5784 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup"); 5785 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname"); 5786 } 5787 initialized = TRUE; 5788 } 5789 } 5790 5791 5792 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) { 5793 assert(initialized && _WSAStartup != NULL, 5794 "WinSock2Available() not yet called"); 5795 return _WSAStartup(wVersionRequested, lpWSAData); 5796 } 5797 5798 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5799 assert(initialized && _gethostbyname != NULL, 5800 "WinSock2Available() not yet called"); 5801 return _gethostbyname(name); 5802 } 5803 5804 BOOL os::WinSock2Dll::WinSock2Available() { 5805 if (!initialized) { 5806 initialize(); 5807 } 5808 return _WSAStartup != NULL && 5809 _gethostbyname != NULL; 5810 } 5811 5812 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 5813 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE); 5814 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID); 5815 5816 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL; 5817 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL; 5818 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL; 5819 BOOL os::Advapi32Dll::initialized = FALSE; 5820 5821 void os::Advapi32Dll::initialize() { 5822 if (!initialized) { 5823 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0); 5824 if (handle != NULL) { 5825 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle, 5826 "AdjustTokenPrivileges"); 5827 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle, 5828 "OpenProcessToken"); 5829 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle, 5830 "LookupPrivilegeValueA"); 5831 } 5832 initialized = TRUE; 5833 } 5834 } 5835 5836 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5837 BOOL DisableAllPrivileges, 5838 PTOKEN_PRIVILEGES NewState, 5839 DWORD BufferLength, 5840 PTOKEN_PRIVILEGES PreviousState, 5841 PDWORD ReturnLength) { 5842 assert(initialized && _AdjustTokenPrivileges != NULL, 5843 "AdvapiAvailable() not yet called"); 5844 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5845 BufferLength, PreviousState, ReturnLength); 5846 } 5847 5848 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5849 DWORD DesiredAccess, 5850 PHANDLE TokenHandle) { 5851 assert(initialized && _OpenProcessToken != NULL, 5852 "AdvapiAvailable() not yet called"); 5853 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5854 } 5855 5856 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5857 LPCTSTR lpName, PLUID lpLuid) { 5858 assert(initialized && _LookupPrivilegeValue != NULL, 5859 "AdvapiAvailable() not yet called"); 5860 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5861 } 5862 5863 BOOL os::Advapi32Dll::AdvapiAvailable() { 5864 if (!initialized) { 5865 initialize(); 5866 } 5867 return _AdjustTokenPrivileges != NULL && 5868 _OpenProcessToken != NULL && 5869 _LookupPrivilegeValue != NULL; 5870 } 5871 5872 #endif 5873 5874 #ifndef PRODUCT 5875 5876 // test the code path in reserve_memory_special() that tries to allocate memory in a single 5877 // contiguous memory block at a particular address. 5878 // The test first tries to find a good approximate address to allocate at by using the same 5879 // method to allocate some memory at any address. The test then tries to allocate memory in 5880 // the vicinity (not directly after it to avoid possible by-chance use of that location) 5881 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of 5882 // the previously allocated memory is available for allocation. The only actual failure 5883 // that is reported is when the test tries to allocate at a particular location but gets a 5884 // different valid one. A NULL return value at this point is not considered an error but may 5885 // be legitimate. 5886 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages. 5887 void TestReserveMemorySpecial_test() { 5888 if (!UseLargePages) { 5889 if (VerboseInternalVMTests) { 5890 gclog_or_tty->print("Skipping test because large pages are disabled"); 5891 } 5892 return; 5893 } 5894 // save current value of globals 5895 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; 5896 bool old_use_numa_interleaving = UseNUMAInterleaving; 5897 5898 // set globals to make sure we hit the correct code path 5899 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; 5900 5901 // do an allocation at an address selected by the OS to get a good one. 5902 const size_t large_allocation_size = os::large_page_size() * 4; 5903 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); 5904 if (result == NULL) { 5905 if (VerboseInternalVMTests) { 5906 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.", 5907 large_allocation_size); 5908 } 5909 } else { 5910 os::release_memory_special(result, large_allocation_size); 5911 5912 // allocate another page within the recently allocated memory area which seems to be a good location. At least 5913 // we managed to get it once. 5914 const size_t expected_allocation_size = os::large_page_size(); 5915 char* expected_location = result + os::large_page_size(); 5916 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); 5917 if (actual_location == NULL) { 5918 if (VerboseInternalVMTests) { 5919 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.", 5920 expected_location, large_allocation_size); 5921 } 5922 } else { 5923 // release memory 5924 os::release_memory_special(actual_location, expected_allocation_size); 5925 // only now check, after releasing any memory to avoid any leaks. 5926 assert(actual_location == expected_location, 5927 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead", 5928 expected_location, expected_allocation_size, actual_location)); 5929 } 5930 } 5931 5932 // restore globals 5933 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; 5934 UseNUMAInterleaving = old_use_numa_interleaving; 5935 } 5936 #endif // PRODUCT 5937