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 = 50115; // non-java thread 432 if (thread->is_Java_thread()) { 433 res = 40115; // 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 jlong windows_time_stamp(FILETIME wt) { 843 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 844 return (a - offset()); 845 } 846 847 FILETIME java_to_windows_time(jlong l) { 848 jlong a = (l * 10000) + offset(); 849 FILETIME result; 850 result.dwHighDateTime = high(a); 851 result.dwLowDateTime = low(a); 852 return result; 853 } 854 855 bool os::supports_vtime() { return true; } 856 bool os::enable_vtime() { return false; } 857 bool os::vtime_enabled() { return false; } 858 859 double os::elapsedVTime() { 860 FILETIME created; 861 FILETIME exited; 862 FILETIME kernel; 863 FILETIME user; 864 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) { 865 // the resolution of windows_to_java_time() should be sufficient (ms) 866 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS; 867 } else { 868 return elapsedTime(); 869 } 870 } 871 872 jlong os::javaTimeMillis() { 873 if (UseFakeTimers) { 874 return fake_time++; 875 } else { 876 FILETIME wt; 877 GetSystemTimeAsFileTime(&wt); 878 return windows_to_java_time(wt); 879 } 880 } 881 882 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 883 FILETIME wt; 884 GetSystemTimeAsFileTime(&wt); 885 jlong ts = windows_time_stamp(wt); // 10th of micros 886 jlong secs = jlong(ts / 10000000); // 10000 * 1000 887 seconds = secs; 888 nanos = jlong(ts - (secs*10000000)) * 100; 889 } 890 891 jlong os::javaTimeNanos() { 892 if (!win32::_has_performance_count) { 893 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do. 894 } else { 895 LARGE_INTEGER current_count; 896 QueryPerformanceCounter(¤t_count); 897 double current = as_long(current_count); 898 double freq = performance_frequency; 899 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC); 900 return time; 901 } 902 } 903 904 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 905 if (!win32::_has_performance_count) { 906 // javaTimeMillis() doesn't have much percision, 907 // but it is not going to wrap -- so all 64 bits 908 info_ptr->max_value = ALL_64_BITS; 909 910 // this is a wall clock timer, so may skip 911 info_ptr->may_skip_backward = true; 912 info_ptr->may_skip_forward = true; 913 } else { 914 jlong freq = performance_frequency; 915 if (freq < NANOSECS_PER_SEC) { 916 // the performance counter is 64 bits and we will 917 // be multiplying it -- so no wrap in 64 bits 918 info_ptr->max_value = ALL_64_BITS; 919 } else if (freq > NANOSECS_PER_SEC) { 920 // use the max value the counter can reach to 921 // determine the max value which could be returned 922 julong max_counter = (julong)ALL_64_BITS; 923 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC)); 924 } else { 925 // the performance counter is 64 bits and we will 926 // be using it directly -- so no wrap in 64 bits 927 info_ptr->max_value = ALL_64_BITS; 928 } 929 930 // using a counter, so no skipping 931 info_ptr->may_skip_backward = false; 932 info_ptr->may_skip_forward = false; 933 } 934 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 935 } 936 937 char* os::local_time_string(char *buf, size_t buflen) { 938 SYSTEMTIME st; 939 GetLocalTime(&st); 940 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 941 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 942 return buf; 943 } 944 945 bool os::getTimesSecs(double* process_real_time, 946 double* process_user_time, 947 double* process_system_time) { 948 HANDLE h_process = GetCurrentProcess(); 949 FILETIME create_time, exit_time, kernel_time, user_time; 950 BOOL result = GetProcessTimes(h_process, 951 &create_time, 952 &exit_time, 953 &kernel_time, 954 &user_time); 955 if (result != 0) { 956 FILETIME wt; 957 GetSystemTimeAsFileTime(&wt); 958 jlong rtc_millis = windows_to_java_time(wt); 959 jlong user_millis = windows_to_java_time(user_time); 960 jlong system_millis = windows_to_java_time(kernel_time); 961 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 962 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); 963 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); 964 return true; 965 } else { 966 return false; 967 } 968 } 969 970 void os::shutdown() { 971 // allow PerfMemory to attempt cleanup of any persistent resources 972 perfMemory_exit(); 973 974 // flush buffered output, finish log files 975 ostream_abort(); 976 977 // Check for abort hook 978 abort_hook_t abort_hook = Arguments::abort_hook(); 979 if (abort_hook != NULL) { 980 abort_hook(); 981 } 982 } 983 984 985 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 986 PMINIDUMP_EXCEPTION_INFORMATION, 987 PMINIDUMP_USER_STREAM_INFORMATION, 988 PMINIDUMP_CALLBACK_INFORMATION); 989 990 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) { 991 HINSTANCE dbghelp; 992 EXCEPTION_POINTERS ep; 993 MINIDUMP_EXCEPTION_INFORMATION mei; 994 MINIDUMP_EXCEPTION_INFORMATION* pmei; 995 996 HANDLE hProcess = GetCurrentProcess(); 997 DWORD processId = GetCurrentProcessId(); 998 HANDLE dumpFile; 999 MINIDUMP_TYPE dumpType; 1000 static const char* cwd; 1001 1002 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows. 1003 #ifndef ASSERT 1004 // If running on a client version of Windows and user has not explicitly enabled dumping 1005 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) { 1006 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false); 1007 return; 1008 // If running on a server version of Windows and user has explictly disabled dumping 1009 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) { 1010 VMError::report_coredump_status("Minidump has been disabled from the command line", false); 1011 return; 1012 } 1013 #else 1014 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) { 1015 VMError::report_coredump_status("Minidump has been disabled from the command line", false); 1016 return; 1017 } 1018 #endif 1019 1020 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0); 1021 1022 if (dbghelp == NULL) { 1023 VMError::report_coredump_status("Failed to load dbghelp.dll", false); 1024 return; 1025 } 1026 1027 _MiniDumpWriteDump = 1028 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 1029 PMINIDUMP_EXCEPTION_INFORMATION, 1030 PMINIDUMP_USER_STREAM_INFORMATION, 1031 PMINIDUMP_CALLBACK_INFORMATION), 1032 GetProcAddress(dbghelp, 1033 "MiniDumpWriteDump")); 1034 1035 if (_MiniDumpWriteDump == NULL) { 1036 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false); 1037 return; 1038 } 1039 1040 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData); 1041 1042 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with 1043 // API_VERSION_NUMBER 11 or higher contains the ones we want though 1044 #if API_VERSION_NUMBER >= 11 1045 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | 1046 MiniDumpWithUnloadedModules); 1047 #endif 1048 1049 cwd = get_current_directory(NULL, 0); 1050 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp", cwd, current_process_id()); 1051 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); 1052 1053 if (dumpFile == INVALID_HANDLE_VALUE) { 1054 VMError::report_coredump_status("Failed to create file for dumping", false); 1055 return; 1056 } 1057 if (exceptionRecord != NULL && contextRecord != NULL) { 1058 ep.ContextRecord = (PCONTEXT) contextRecord; 1059 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord; 1060 1061 mei.ThreadId = GetCurrentThreadId(); 1062 mei.ExceptionPointers = &ep; 1063 pmei = &mei; 1064 } else { 1065 pmei = NULL; 1066 } 1067 1068 1069 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all 1070 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then. 1071 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false && 1072 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) { 1073 DWORD error = GetLastError(); 1074 LPTSTR msgbuf = NULL; 1075 1076 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | 1077 FORMAT_MESSAGE_FROM_SYSTEM | 1078 FORMAT_MESSAGE_IGNORE_INSERTS, 1079 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) { 1080 1081 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf); 1082 LocalFree(msgbuf); 1083 } else { 1084 // Call to FormatMessage failed, just include the result from GetLastError 1085 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error); 1086 } 1087 VMError::report_coredump_status(buffer, false); 1088 } else { 1089 VMError::report_coredump_status(buffer, true); 1090 } 1091 1092 CloseHandle(dumpFile); 1093 } 1094 1095 1096 void os::abort(bool dump_core) { 1097 os::shutdown(); 1098 // no core dump on Windows 1099 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1100 } 1101 1102 // Die immediately, no exit hook, no abort hook, no cleanup. 1103 void os::die() { 1104 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1); 1105 } 1106 1107 // Directory routines copied from src/win32/native/java/io/dirent_md.c 1108 // * dirent_md.c 1.15 00/02/02 1109 // 1110 // The declarations for DIR and struct dirent are in jvm_win32.h. 1111 1112 // Caller must have already run dirname through JVM_NativePath, which removes 1113 // duplicate slashes and converts all instances of '/' into '\\'. 1114 1115 DIR * os::opendir(const char *dirname) { 1116 assert(dirname != NULL, "just checking"); // hotspot change 1117 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal); 1118 DWORD fattr; // hotspot change 1119 char alt_dirname[4] = { 0, 0, 0, 0 }; 1120 1121 if (dirp == 0) { 1122 errno = ENOMEM; 1123 return 0; 1124 } 1125 1126 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it 1127 // as a directory in FindFirstFile(). We detect this case here and 1128 // prepend the current drive name. 1129 // 1130 if (dirname[1] == '\0' && dirname[0] == '\\') { 1131 alt_dirname[0] = _getdrive() + 'A' - 1; 1132 alt_dirname[1] = ':'; 1133 alt_dirname[2] = '\\'; 1134 alt_dirname[3] = '\0'; 1135 dirname = alt_dirname; 1136 } 1137 1138 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal); 1139 if (dirp->path == 0) { 1140 free(dirp); 1141 errno = ENOMEM; 1142 return 0; 1143 } 1144 strcpy(dirp->path, dirname); 1145 1146 fattr = GetFileAttributes(dirp->path); 1147 if (fattr == 0xffffffff) { 1148 free(dirp->path); 1149 free(dirp); 1150 errno = ENOENT; 1151 return 0; 1152 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 1153 free(dirp->path); 1154 free(dirp); 1155 errno = ENOTDIR; 1156 return 0; 1157 } 1158 1159 // Append "*.*", or possibly "\\*.*", to path 1160 if (dirp->path[1] == ':' && 1161 (dirp->path[2] == '\0' || 1162 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 1163 // No '\\' needed for cases like "Z:" or "Z:\" 1164 strcat(dirp->path, "*.*"); 1165 } else { 1166 strcat(dirp->path, "\\*.*"); 1167 } 1168 1169 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 1170 if (dirp->handle == INVALID_HANDLE_VALUE) { 1171 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 1172 free(dirp->path); 1173 free(dirp); 1174 errno = EACCES; 1175 return 0; 1176 } 1177 } 1178 return dirp; 1179 } 1180 1181 // parameter dbuf unused on Windows 1182 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) { 1183 assert(dirp != NULL, "just checking"); // hotspot change 1184 if (dirp->handle == INVALID_HANDLE_VALUE) { 1185 return 0; 1186 } 1187 1188 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 1189 1190 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 1191 if (GetLastError() == ERROR_INVALID_HANDLE) { 1192 errno = EBADF; 1193 return 0; 1194 } 1195 FindClose(dirp->handle); 1196 dirp->handle = INVALID_HANDLE_VALUE; 1197 } 1198 1199 return &dirp->dirent; 1200 } 1201 1202 int os::closedir(DIR *dirp) { 1203 assert(dirp != NULL, "just checking"); // hotspot change 1204 if (dirp->handle != INVALID_HANDLE_VALUE) { 1205 if (!FindClose(dirp->handle)) { 1206 errno = EBADF; 1207 return -1; 1208 } 1209 dirp->handle = INVALID_HANDLE_VALUE; 1210 } 1211 free(dirp->path); 1212 free(dirp); 1213 return 0; 1214 } 1215 1216 // This must be hard coded because it's the system's temporary 1217 // directory not the java application's temp directory, ala java.io.tmpdir. 1218 const char* os::get_temp_directory() { 1219 static char path_buf[MAX_PATH]; 1220 if (GetTempPath(MAX_PATH, path_buf) > 0) { 1221 return path_buf; 1222 } else { 1223 path_buf[0] = '\0'; 1224 return path_buf; 1225 } 1226 } 1227 1228 static bool file_exists(const char* filename) { 1229 if (filename == NULL || strlen(filename) == 0) { 1230 return false; 1231 } 1232 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES; 1233 } 1234 1235 bool os::dll_build_name(char *buffer, size_t buflen, 1236 const char* pname, const char* fname) { 1237 bool retval = false; 1238 const size_t pnamelen = pname ? strlen(pname) : 0; 1239 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0; 1240 1241 // Return error on buffer overflow. 1242 if (pnamelen + strlen(fname) + 10 > buflen) { 1243 return retval; 1244 } 1245 1246 if (pnamelen == 0) { 1247 jio_snprintf(buffer, buflen, "%s.dll", fname); 1248 retval = true; 1249 } else if (c == ':' || c == '\\') { 1250 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname); 1251 retval = true; 1252 } else if (strchr(pname, *os::path_separator()) != NULL) { 1253 int n; 1254 char** pelements = split_path(pname, &n); 1255 if (pelements == NULL) { 1256 return false; 1257 } 1258 for (int i = 0; i < n; i++) { 1259 char* path = pelements[i]; 1260 // Really shouldn't be NULL, but check can't hurt 1261 size_t plen = (path == NULL) ? 0 : strlen(path); 1262 if (plen == 0) { 1263 continue; // skip the empty path values 1264 } 1265 const char lastchar = path[plen - 1]; 1266 if (lastchar == ':' || lastchar == '\\') { 1267 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname); 1268 } else { 1269 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname); 1270 } 1271 if (file_exists(buffer)) { 1272 retval = true; 1273 break; 1274 } 1275 } 1276 // release the storage 1277 for (int i = 0; i < n; i++) { 1278 if (pelements[i] != NULL) { 1279 FREE_C_HEAP_ARRAY(char, pelements[i]); 1280 } 1281 } 1282 if (pelements != NULL) { 1283 FREE_C_HEAP_ARRAY(char*, pelements); 1284 } 1285 } else { 1286 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname); 1287 retval = true; 1288 } 1289 return retval; 1290 } 1291 1292 // Needs to be in os specific directory because windows requires another 1293 // header file <direct.h> 1294 const char* os::get_current_directory(char *buf, size_t buflen) { 1295 int n = static_cast<int>(buflen); 1296 if (buflen > INT_MAX) n = INT_MAX; 1297 return _getcwd(buf, n); 1298 } 1299 1300 //----------------------------------------------------------- 1301 // Helper functions for fatal error handler 1302 #ifdef _WIN64 1303 // Helper routine which returns true if address in 1304 // within the NTDLL address space. 1305 // 1306 static bool _addr_in_ntdll(address addr) { 1307 HMODULE hmod; 1308 MODULEINFO minfo; 1309 1310 hmod = GetModuleHandle("NTDLL.DLL"); 1311 if (hmod == NULL) return false; 1312 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod, 1313 &minfo, sizeof(MODULEINFO))) { 1314 return false; 1315 } 1316 1317 if ((addr >= minfo.lpBaseOfDll) && 1318 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) { 1319 return true; 1320 } else { 1321 return false; 1322 } 1323 } 1324 #endif 1325 1326 struct _modinfo { 1327 address addr; 1328 char* full_path; // point to a char buffer 1329 int buflen; // size of the buffer 1330 address base_addr; 1331 }; 1332 1333 static int _locate_module_by_addr(const char * mod_fname, address base_addr, 1334 address top_address, void * param) { 1335 struct _modinfo *pmod = (struct _modinfo *)param; 1336 if (!pmod) return -1; 1337 1338 if (base_addr <= pmod->addr && 1339 top_address > pmod->addr) { 1340 // if a buffer is provided, copy path name to the buffer 1341 if (pmod->full_path) { 1342 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1343 } 1344 pmod->base_addr = base_addr; 1345 return 1; 1346 } 1347 return 0; 1348 } 1349 1350 bool os::dll_address_to_library_name(address addr, char* buf, 1351 int buflen, int* offset) { 1352 // buf is not optional, but offset is optional 1353 assert(buf != NULL, "sanity check"); 1354 1355 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1356 // return the full path to the DLL file, sometimes it returns path 1357 // to the corresponding PDB file (debug info); sometimes it only 1358 // returns partial path, which makes life painful. 1359 1360 struct _modinfo mi; 1361 mi.addr = addr; 1362 mi.full_path = buf; 1363 mi.buflen = buflen; 1364 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) { 1365 // buf already contains path name 1366 if (offset) *offset = addr - mi.base_addr; 1367 return true; 1368 } 1369 1370 buf[0] = '\0'; 1371 if (offset) *offset = -1; 1372 return false; 1373 } 1374 1375 bool os::dll_address_to_function_name(address addr, char *buf, 1376 int buflen, int *offset) { 1377 // buf is not optional, but offset is optional 1378 assert(buf != NULL, "sanity check"); 1379 1380 if (Decoder::decode(addr, buf, buflen, offset)) { 1381 return true; 1382 } 1383 if (offset != NULL) *offset = -1; 1384 buf[0] = '\0'; 1385 return false; 1386 } 1387 1388 // save the start and end address of jvm.dll into param[0] and param[1] 1389 static int _locate_jvm_dll(const char* mod_fname, address base_addr, 1390 address top_address, void * param) { 1391 if (!param) return -1; 1392 1393 if (base_addr <= (address)_locate_jvm_dll && 1394 top_address > (address)_locate_jvm_dll) { 1395 ((address*)param)[0] = base_addr; 1396 ((address*)param)[1] = top_address; 1397 return 1; 1398 } 1399 return 0; 1400 } 1401 1402 address vm_lib_location[2]; // start and end address of jvm.dll 1403 1404 // check if addr is inside jvm.dll 1405 bool os::address_is_in_vm(address addr) { 1406 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1407 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) { 1408 assert(false, "Can't find jvm module."); 1409 return false; 1410 } 1411 } 1412 1413 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1414 } 1415 1416 // print module info; param is outputStream* 1417 static int _print_module(const char* fname, address base_address, 1418 address top_address, void* param) { 1419 if (!param) return -1; 1420 1421 outputStream* st = (outputStream*)param; 1422 1423 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname); 1424 return 0; 1425 } 1426 1427 // Loads .dll/.so and 1428 // in case of error it checks if .dll/.so was built for the 1429 // same architecture as Hotspot is running on 1430 void * os::dll_load(const char *name, char *ebuf, int ebuflen) { 1431 void * result = LoadLibrary(name); 1432 if (result != NULL) { 1433 return result; 1434 } 1435 1436 DWORD errcode = GetLastError(); 1437 if (errcode == ERROR_MOD_NOT_FOUND) { 1438 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1); 1439 ebuf[ebuflen - 1] = '\0'; 1440 return NULL; 1441 } 1442 1443 // Parsing dll below 1444 // If we can read dll-info and find that dll was built 1445 // for an architecture other than Hotspot is running in 1446 // - then print to buffer "DLL was built for a different architecture" 1447 // else call os::lasterror to obtain system error message 1448 1449 // Read system error message into ebuf 1450 // It may or may not be overwritten below (in the for loop and just above) 1451 lasterror(ebuf, (size_t) ebuflen); 1452 ebuf[ebuflen - 1] = '\0'; 1453 int fd = ::open(name, O_RDONLY | O_BINARY, 0); 1454 if (fd < 0) { 1455 return NULL; 1456 } 1457 1458 uint32_t signature_offset; 1459 uint16_t lib_arch = 0; 1460 bool failed_to_get_lib_arch = 1461 ( // Go to position 3c in the dll 1462 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0) 1463 || 1464 // Read location of signature 1465 (sizeof(signature_offset) != 1466 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset)))) 1467 || 1468 // Go to COFF File Header in dll 1469 // that is located after "signature" (4 bytes long) 1470 (os::seek_to_file_offset(fd, 1471 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0) 1472 || 1473 // Read field that contains code of architecture 1474 // that dll was built for 1475 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch)))) 1476 ); 1477 1478 ::close(fd); 1479 if (failed_to_get_lib_arch) { 1480 // file i/o error - report os::lasterror(...) msg 1481 return NULL; 1482 } 1483 1484 typedef struct { 1485 uint16_t arch_code; 1486 char* arch_name; 1487 } arch_t; 1488 1489 static const arch_t arch_array[] = { 1490 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1491 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1492 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1493 }; 1494 #if (defined _M_IA64) 1495 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64; 1496 #elif (defined _M_AMD64) 1497 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64; 1498 #elif (defined _M_IX86) 1499 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386; 1500 #else 1501 #error Method os::dll_load requires that one of following \ 1502 is defined :_M_IA64,_M_AMD64 or _M_IX86 1503 #endif 1504 1505 1506 // Obtain a string for printf operation 1507 // lib_arch_str shall contain string what platform this .dll was built for 1508 // running_arch_str shall string contain what platform Hotspot was built for 1509 char *running_arch_str = NULL, *lib_arch_str = NULL; 1510 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) { 1511 if (lib_arch == arch_array[i].arch_code) { 1512 lib_arch_str = arch_array[i].arch_name; 1513 } 1514 if (running_arch == arch_array[i].arch_code) { 1515 running_arch_str = arch_array[i].arch_name; 1516 } 1517 } 1518 1519 assert(running_arch_str, 1520 "Didn't find running architecture code in arch_array"); 1521 1522 // If the architecture is right 1523 // but some other error took place - report os::lasterror(...) msg 1524 if (lib_arch == running_arch) { 1525 return NULL; 1526 } 1527 1528 if (lib_arch_str != NULL) { 1529 ::_snprintf(ebuf, ebuflen - 1, 1530 "Can't load %s-bit .dll on a %s-bit platform", 1531 lib_arch_str, running_arch_str); 1532 } else { 1533 // don't know what architecture this dll was build for 1534 ::_snprintf(ebuf, ebuflen - 1, 1535 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1536 lib_arch, running_arch_str); 1537 } 1538 1539 return NULL; 1540 } 1541 1542 void os::print_dll_info(outputStream *st) { 1543 st->print_cr("Dynamic libraries:"); 1544 get_loaded_modules_info(_print_module, (void *)st); 1545 } 1546 1547 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1548 HANDLE hProcess; 1549 1550 # define MAX_NUM_MODULES 128 1551 HMODULE modules[MAX_NUM_MODULES]; 1552 static char filename[MAX_PATH]; 1553 int result = 0; 1554 1555 if (!os::PSApiDll::PSApiAvailable()) { 1556 return 0; 1557 } 1558 1559 int pid = os::current_process_id(); 1560 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1561 FALSE, pid); 1562 if (hProcess == NULL) return 0; 1563 1564 DWORD size_needed; 1565 if (!os::PSApiDll::EnumProcessModules(hProcess, modules, 1566 sizeof(modules), &size_needed)) { 1567 CloseHandle(hProcess); 1568 return 0; 1569 } 1570 1571 // number of modules that are currently loaded 1572 int num_modules = size_needed / sizeof(HMODULE); 1573 1574 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1575 // Get Full pathname: 1576 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i], 1577 filename, sizeof(filename))) { 1578 filename[0] = '\0'; 1579 } 1580 1581 MODULEINFO modinfo; 1582 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i], 1583 &modinfo, sizeof(modinfo))) { 1584 modinfo.lpBaseOfDll = NULL; 1585 modinfo.SizeOfImage = 0; 1586 } 1587 1588 // Invoke callback function 1589 result = callback(filename, (address)modinfo.lpBaseOfDll, 1590 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param); 1591 if (result) break; 1592 } 1593 1594 CloseHandle(hProcess); 1595 return result; 1596 } 1597 1598 void os::print_os_info_brief(outputStream* st) { 1599 os::print_os_info(st); 1600 } 1601 1602 void os::print_os_info(outputStream* st) { 1603 #ifdef ASSERT 1604 char buffer[1024]; 1605 DWORD size = sizeof(buffer); 1606 st->print(" HostName: "); 1607 if (GetComputerNameEx(ComputerNameDnsHostname, buffer, &size)) { 1608 st->print("%s", buffer); 1609 } else { 1610 st->print("N/A"); 1611 } 1612 #endif 1613 st->print(" OS:"); 1614 os::win32::print_windows_version(st); 1615 } 1616 1617 void os::win32::print_windows_version(outputStream* st) { 1618 OSVERSIONINFOEX osvi; 1619 VS_FIXEDFILEINFO *file_info; 1620 TCHAR kernel32_path[MAX_PATH]; 1621 UINT len, ret; 1622 1623 // Use the GetVersionEx information to see if we're on a server or 1624 // workstation edition of Windows. Starting with Windows 8.1 we can't 1625 // trust the OS version information returned by this API. 1626 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1627 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1628 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1629 st->print_cr("Call to GetVersionEx failed"); 1630 return; 1631 } 1632 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION); 1633 1634 // Get the full path to \Windows\System32\kernel32.dll and use that for 1635 // determining what version of Windows we're running on. 1636 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1; 1637 ret = GetSystemDirectory(kernel32_path, len); 1638 if (ret == 0 || ret > len) { 1639 st->print_cr("Call to GetSystemDirectory failed"); 1640 return; 1641 } 1642 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret); 1643 1644 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL); 1645 if (version_size == 0) { 1646 st->print_cr("Call to GetFileVersionInfoSize failed"); 1647 return; 1648 } 1649 1650 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal); 1651 if (version_info == NULL) { 1652 st->print_cr("Failed to allocate version_info"); 1653 return; 1654 } 1655 1656 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) { 1657 os::free(version_info); 1658 st->print_cr("Call to GetFileVersionInfo failed"); 1659 return; 1660 } 1661 1662 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) { 1663 os::free(version_info); 1664 st->print_cr("Call to VerQueryValue failed"); 1665 return; 1666 } 1667 1668 int major_version = HIWORD(file_info->dwProductVersionMS); 1669 int minor_version = LOWORD(file_info->dwProductVersionMS); 1670 int build_number = HIWORD(file_info->dwProductVersionLS); 1671 int build_minor = LOWORD(file_info->dwProductVersionLS); 1672 int os_vers = major_version * 1000 + minor_version; 1673 os::free(version_info); 1674 1675 st->print(" Windows "); 1676 switch (os_vers) { 1677 1678 case 6000: 1679 if (is_workstation) { 1680 st->print("Vista"); 1681 } else { 1682 st->print("Server 2008"); 1683 } 1684 break; 1685 1686 case 6001: 1687 if (is_workstation) { 1688 st->print("7"); 1689 } else { 1690 st->print("Server 2008 R2"); 1691 } 1692 break; 1693 1694 case 6002: 1695 if (is_workstation) { 1696 st->print("8"); 1697 } else { 1698 st->print("Server 2012"); 1699 } 1700 break; 1701 1702 case 6003: 1703 if (is_workstation) { 1704 st->print("8.1"); 1705 } else { 1706 st->print("Server 2012 R2"); 1707 } 1708 break; 1709 1710 case 6004: 1711 if (is_workstation) { 1712 st->print("10"); 1713 } else { 1714 // The server version name of Windows 10 is not known at this time 1715 st->print("%d.%d", major_version, minor_version); 1716 } 1717 break; 1718 1719 default: 1720 // Unrecognized windows, print out its major and minor versions 1721 st->print("%d.%d", major_version, minor_version); 1722 break; 1723 } 1724 1725 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1726 // find out whether we are running on 64 bit processor or not 1727 SYSTEM_INFO si; 1728 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1729 os::Kernel32Dll::GetNativeSystemInfo(&si); 1730 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1731 st->print(" , 64 bit"); 1732 } 1733 1734 st->print(" Build %d", build_number); 1735 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor); 1736 st->cr(); 1737 } 1738 1739 void os::pd_print_cpu_info(outputStream* st) { 1740 // Nothing to do for now. 1741 } 1742 1743 void os::print_memory_info(outputStream* st) { 1744 st->print("Memory:"); 1745 st->print(" %dk page", os::vm_page_size()>>10); 1746 1747 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1748 // value if total memory is larger than 4GB 1749 MEMORYSTATUSEX ms; 1750 ms.dwLength = sizeof(ms); 1751 GlobalMemoryStatusEx(&ms); 1752 1753 st->print(", physical %uk", os::physical_memory() >> 10); 1754 st->print("(%uk free)", os::available_memory() >> 10); 1755 1756 st->print(", swap %uk", ms.ullTotalPageFile >> 10); 1757 st->print("(%uk free)", ms.ullAvailPageFile >> 10); 1758 st->cr(); 1759 } 1760 1761 void os::print_siginfo(outputStream *st, void *siginfo) { 1762 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1763 st->print("siginfo:"); 1764 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1765 1766 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1767 er->NumberParameters >= 2) { 1768 switch (er->ExceptionInformation[0]) { 1769 case 0: st->print(", reading address"); break; 1770 case 1: st->print(", writing address"); break; 1771 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1772 er->ExceptionInformation[0]); 1773 } 1774 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1775 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1776 er->NumberParameters >= 2 && UseSharedSpaces) { 1777 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1778 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1779 st->print("\n\nError accessing class data sharing archive." \ 1780 " Mapped file inaccessible during execution, " \ 1781 " possible disk/network problem."); 1782 } 1783 } else { 1784 int num = er->NumberParameters; 1785 if (num > 0) { 1786 st->print(", ExceptionInformation="); 1787 for (int i = 0; i < num; i++) { 1788 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1789 } 1790 } 1791 } 1792 st->cr(); 1793 } 1794 1795 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1796 // do nothing 1797 } 1798 1799 static char saved_jvm_path[MAX_PATH] = {0}; 1800 1801 // Find the full path to the current module, jvm.dll 1802 void os::jvm_path(char *buf, jint buflen) { 1803 // Error checking. 1804 if (buflen < MAX_PATH) { 1805 assert(false, "must use a large-enough buffer"); 1806 buf[0] = '\0'; 1807 return; 1808 } 1809 // Lazy resolve the path to current module. 1810 if (saved_jvm_path[0] != 0) { 1811 strcpy(buf, saved_jvm_path); 1812 return; 1813 } 1814 1815 buf[0] = '\0'; 1816 if (Arguments::sun_java_launcher_is_altjvm()) { 1817 // Support for the java launcher's '-XXaltjvm=<path>' option. Check 1818 // for a JAVA_HOME environment variable and fix up the path so it 1819 // looks like jvm.dll is installed there (append a fake suffix 1820 // hotspot/jvm.dll). 1821 char* java_home_var = ::getenv("JAVA_HOME"); 1822 if (java_home_var != NULL && java_home_var[0] != 0 && 1823 strlen(java_home_var) < (size_t)buflen) { 1824 strncpy(buf, java_home_var, buflen); 1825 1826 // determine if this is a legacy image or modules image 1827 // modules image doesn't have "jre" subdirectory 1828 size_t len = strlen(buf); 1829 char* jrebin_p = buf + len; 1830 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1831 if (0 != _access(buf, 0)) { 1832 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1833 } 1834 len = strlen(buf); 1835 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1836 } 1837 } 1838 1839 if (buf[0] == '\0') { 1840 GetModuleFileName(vm_lib_handle, buf, buflen); 1841 } 1842 strncpy(saved_jvm_path, buf, MAX_PATH); 1843 saved_jvm_path[MAX_PATH - 1] = '\0'; 1844 } 1845 1846 1847 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1848 #ifndef _WIN64 1849 st->print("_"); 1850 #endif 1851 } 1852 1853 1854 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1855 #ifndef _WIN64 1856 st->print("@%d", args_size * sizeof(int)); 1857 #endif 1858 } 1859 1860 // This method is a copy of JDK's sysGetLastErrorString 1861 // from src/windows/hpi/src/system_md.c 1862 1863 size_t os::lasterror(char* buf, size_t len) { 1864 DWORD errval; 1865 1866 if ((errval = GetLastError()) != 0) { 1867 // DOS error 1868 size_t n = (size_t)FormatMessage( 1869 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1870 NULL, 1871 errval, 1872 0, 1873 buf, 1874 (DWORD)len, 1875 NULL); 1876 if (n > 3) { 1877 // Drop final '.', CR, LF 1878 if (buf[n - 1] == '\n') n--; 1879 if (buf[n - 1] == '\r') n--; 1880 if (buf[n - 1] == '.') n--; 1881 buf[n] = '\0'; 1882 } 1883 return n; 1884 } 1885 1886 if (errno != 0) { 1887 // C runtime error that has no corresponding DOS error code 1888 const char* s = strerror(errno); 1889 size_t n = strlen(s); 1890 if (n >= len) n = len - 1; 1891 strncpy(buf, s, n); 1892 buf[n] = '\0'; 1893 return n; 1894 } 1895 1896 return 0; 1897 } 1898 1899 int os::get_last_error() { 1900 DWORD error = GetLastError(); 1901 if (error == 0) { 1902 error = errno; 1903 } 1904 return (int)error; 1905 } 1906 1907 // sun.misc.Signal 1908 // NOTE that this is a workaround for an apparent kernel bug where if 1909 // a signal handler for SIGBREAK is installed then that signal handler 1910 // takes priority over the console control handler for CTRL_CLOSE_EVENT. 1911 // See bug 4416763. 1912 static void (*sigbreakHandler)(int) = NULL; 1913 1914 static void UserHandler(int sig, void *siginfo, void *context) { 1915 os::signal_notify(sig); 1916 // We need to reinstate the signal handler each time... 1917 os::signal(sig, (void*)UserHandler); 1918 } 1919 1920 void* os::user_handler() { 1921 return (void*) UserHandler; 1922 } 1923 1924 void* os::signal(int signal_number, void* handler) { 1925 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1926 void (*oldHandler)(int) = sigbreakHandler; 1927 sigbreakHandler = (void (*)(int)) handler; 1928 return (void*) oldHandler; 1929 } else { 1930 return (void*)::signal(signal_number, (void (*)(int))handler); 1931 } 1932 } 1933 1934 void os::signal_raise(int signal_number) { 1935 raise(signal_number); 1936 } 1937 1938 // The Win32 C runtime library maps all console control events other than ^C 1939 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1940 // logoff, and shutdown events. We therefore install our own console handler 1941 // that raises SIGTERM for the latter cases. 1942 // 1943 static BOOL WINAPI consoleHandler(DWORD event) { 1944 switch (event) { 1945 case CTRL_C_EVENT: 1946 if (is_error_reported()) { 1947 // Ctrl-C is pressed during error reporting, likely because the error 1948 // handler fails to abort. Let VM die immediately. 1949 os::die(); 1950 } 1951 1952 os::signal_raise(SIGINT); 1953 return TRUE; 1954 break; 1955 case CTRL_BREAK_EVENT: 1956 if (sigbreakHandler != NULL) { 1957 (*sigbreakHandler)(SIGBREAK); 1958 } 1959 return TRUE; 1960 break; 1961 case CTRL_LOGOFF_EVENT: { 1962 // Don't terminate JVM if it is running in a non-interactive session, 1963 // such as a service process. 1964 USEROBJECTFLAGS flags; 1965 HANDLE handle = GetProcessWindowStation(); 1966 if (handle != NULL && 1967 GetUserObjectInformation(handle, UOI_FLAGS, &flags, 1968 sizeof(USEROBJECTFLAGS), NULL)) { 1969 // If it is a non-interactive session, let next handler to deal 1970 // with it. 1971 if ((flags.dwFlags & WSF_VISIBLE) == 0) { 1972 return FALSE; 1973 } 1974 } 1975 } 1976 case CTRL_CLOSE_EVENT: 1977 case CTRL_SHUTDOWN_EVENT: 1978 os::signal_raise(SIGTERM); 1979 return TRUE; 1980 break; 1981 default: 1982 break; 1983 } 1984 return FALSE; 1985 } 1986 1987 // The following code is moved from os.cpp for making this 1988 // code platform specific, which it is by its very nature. 1989 1990 // Return maximum OS signal used + 1 for internal use only 1991 // Used as exit signal for signal_thread 1992 int os::sigexitnum_pd() { 1993 return NSIG; 1994 } 1995 1996 // a counter for each possible signal value, including signal_thread exit signal 1997 static volatile jint pending_signals[NSIG+1] = { 0 }; 1998 static HANDLE sig_sem = NULL; 1999 2000 void os::signal_init_pd() { 2001 // Initialize signal structures 2002 memset((void*)pending_signals, 0, sizeof(pending_signals)); 2003 2004 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 2005 2006 // Programs embedding the VM do not want it to attempt to receive 2007 // events like CTRL_LOGOFF_EVENT, which are used to implement the 2008 // shutdown hooks mechanism introduced in 1.3. For example, when 2009 // the VM is run as part of a Windows NT service (i.e., a servlet 2010 // engine in a web server), the correct behavior is for any console 2011 // control handler to return FALSE, not TRUE, because the OS's 2012 // "final" handler for such events allows the process to continue if 2013 // it is a service (while terminating it if it is not a service). 2014 // To make this behavior uniform and the mechanism simpler, we 2015 // completely disable the VM's usage of these console events if -Xrs 2016 // (=ReduceSignalUsage) is specified. This means, for example, that 2017 // the CTRL-BREAK thread dump mechanism is also disabled in this 2018 // case. See bugs 4323062, 4345157, and related bugs. 2019 2020 if (!ReduceSignalUsage) { 2021 // Add a CTRL-C handler 2022 SetConsoleCtrlHandler(consoleHandler, TRUE); 2023 } 2024 } 2025 2026 void os::signal_notify(int signal_number) { 2027 BOOL ret; 2028 if (sig_sem != NULL) { 2029 Atomic::inc(&pending_signals[signal_number]); 2030 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2031 assert(ret != 0, "ReleaseSemaphore() failed"); 2032 } 2033 } 2034 2035 static int check_pending_signals(bool wait_for_signal) { 2036 DWORD ret; 2037 while (true) { 2038 for (int i = 0; i < NSIG + 1; i++) { 2039 jint n = pending_signals[i]; 2040 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2041 return i; 2042 } 2043 } 2044 if (!wait_for_signal) { 2045 return -1; 2046 } 2047 2048 JavaThread *thread = JavaThread::current(); 2049 2050 ThreadBlockInVM tbivm(thread); 2051 2052 bool threadIsSuspended; 2053 do { 2054 thread->set_suspend_equivalent(); 2055 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2056 ret = ::WaitForSingleObject(sig_sem, INFINITE); 2057 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 2058 2059 // were we externally suspended while we were waiting? 2060 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2061 if (threadIsSuspended) { 2062 // The semaphore has been incremented, but while we were waiting 2063 // another thread suspended us. We don't want to continue running 2064 // while suspended because that would surprise the thread that 2065 // suspended us. 2066 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2067 assert(ret != 0, "ReleaseSemaphore() failed"); 2068 2069 thread->java_suspend_self(); 2070 } 2071 } while (threadIsSuspended); 2072 } 2073 } 2074 2075 int os::signal_lookup() { 2076 return check_pending_signals(false); 2077 } 2078 2079 int os::signal_wait() { 2080 return check_pending_signals(true); 2081 } 2082 2083 // Implicit OS exception handling 2084 2085 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, 2086 address handler) { 2087 JavaThread* thread = JavaThread::current(); 2088 // Save pc in thread 2089 #ifdef _M_IA64 2090 // Do not blow up if no thread info available. 2091 if (thread) { 2092 // Saving PRECISE pc (with slot information) in thread. 2093 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress; 2094 // Convert precise PC into "Unix" format 2095 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2); 2096 thread->set_saved_exception_pc((address)precise_pc); 2097 } 2098 // Set pc to handler 2099 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 2100 // Clear out psr.ri (= Restart Instruction) in order to continue 2101 // at the beginning of the target bundle. 2102 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF; 2103 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!"); 2104 #elif _M_AMD64 2105 // Do not blow up if no thread info available. 2106 if (thread) { 2107 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip); 2108 } 2109 // Set pc to handler 2110 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 2111 #else 2112 // Do not blow up if no thread info available. 2113 if (thread) { 2114 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip); 2115 } 2116 // Set pc to handler 2117 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler; 2118 #endif 2119 2120 // Continue the execution 2121 return EXCEPTION_CONTINUE_EXECUTION; 2122 } 2123 2124 2125 // Used for PostMortemDump 2126 extern "C" void safepoints(); 2127 extern "C" void find(int x); 2128 extern "C" void events(); 2129 2130 // According to Windows API documentation, an illegal instruction sequence should generate 2131 // the 0xC000001C exception code. However, real world experience shows that occasionnaly 2132 // the execution of an illegal instruction can generate the exception code 0xC000001E. This 2133 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 2134 2135 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 2136 2137 // From "Execution Protection in the Windows Operating System" draft 0.35 2138 // Once a system header becomes available, the "real" define should be 2139 // included or copied here. 2140 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2141 2142 // Handle NAT Bit consumption on IA64. 2143 #ifdef _M_IA64 2144 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION 2145 #endif 2146 2147 // Windows Vista/2008 heap corruption check 2148 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374 2149 2150 #define def_excpt(val) #val, val 2151 2152 struct siglabel { 2153 char *name; 2154 int number; 2155 }; 2156 2157 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual 2158 // C++ compiler contain this error code. Because this is a compiler-generated 2159 // error, the code is not listed in the Win32 API header files. 2160 // The code is actually a cryptic mnemonic device, with the initial "E" 2161 // standing for "exception" and the final 3 bytes (0x6D7363) representing the 2162 // ASCII values of "msc". 2163 2164 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363 2165 2166 2167 struct siglabel exceptlabels[] = { 2168 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2169 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2170 def_excpt(EXCEPTION_BREAKPOINT), 2171 def_excpt(EXCEPTION_SINGLE_STEP), 2172 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2173 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2174 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2175 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2176 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2177 def_excpt(EXCEPTION_FLT_OVERFLOW), 2178 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2179 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2180 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2181 def_excpt(EXCEPTION_INT_OVERFLOW), 2182 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2183 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2184 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2185 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2186 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2187 def_excpt(EXCEPTION_STACK_OVERFLOW), 2188 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2189 def_excpt(EXCEPTION_GUARD_PAGE), 2190 def_excpt(EXCEPTION_INVALID_HANDLE), 2191 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION), 2192 def_excpt(EXCEPTION_HEAP_CORRUPTION), 2193 #ifdef _M_IA64 2194 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION), 2195 #endif 2196 NULL, 0 2197 }; 2198 2199 const char* os::exception_name(int exception_code, char *buf, size_t size) { 2200 for (int i = 0; exceptlabels[i].name != NULL; i++) { 2201 if (exceptlabels[i].number == exception_code) { 2202 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2203 return buf; 2204 } 2205 } 2206 2207 return NULL; 2208 } 2209 2210 //----------------------------------------------------------------------------- 2211 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2212 // handle exception caused by idiv; should only happen for -MinInt/-1 2213 // (division by zero is handled explicitly) 2214 #ifdef _M_IA64 2215 assert(0, "Fix Handle_IDiv_Exception"); 2216 #elif _M_AMD64 2217 PCONTEXT ctx = exceptionInfo->ContextRecord; 2218 address pc = (address)ctx->Rip; 2219 assert(pc[0] == 0xF7, "not an idiv opcode"); 2220 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2221 assert(ctx->Rax == min_jint, "unexpected idiv exception"); 2222 // set correct result values and continue after idiv instruction 2223 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2224 ctx->Rax = (DWORD)min_jint; // result 2225 ctx->Rdx = (DWORD)0; // remainder 2226 // Continue the execution 2227 #else 2228 PCONTEXT ctx = exceptionInfo->ContextRecord; 2229 address pc = (address)ctx->Eip; 2230 assert(pc[0] == 0xF7, "not an idiv opcode"); 2231 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2232 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2233 // set correct result values and continue after idiv instruction 2234 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2235 ctx->Eax = (DWORD)min_jint; // result 2236 ctx->Edx = (DWORD)0; // remainder 2237 // Continue the execution 2238 #endif 2239 return EXCEPTION_CONTINUE_EXECUTION; 2240 } 2241 2242 //----------------------------------------------------------------------------- 2243 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2244 PCONTEXT ctx = exceptionInfo->ContextRecord; 2245 #ifndef _WIN64 2246 // handle exception caused by native method modifying control word 2247 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2248 2249 switch (exception_code) { 2250 case EXCEPTION_FLT_DENORMAL_OPERAND: 2251 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2252 case EXCEPTION_FLT_INEXACT_RESULT: 2253 case EXCEPTION_FLT_INVALID_OPERATION: 2254 case EXCEPTION_FLT_OVERFLOW: 2255 case EXCEPTION_FLT_STACK_CHECK: 2256 case EXCEPTION_FLT_UNDERFLOW: 2257 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2258 if (fp_control_word != ctx->FloatSave.ControlWord) { 2259 // Restore FPCW and mask out FLT exceptions 2260 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2261 // Mask out pending FLT exceptions 2262 ctx->FloatSave.StatusWord &= 0xffffff00; 2263 return EXCEPTION_CONTINUE_EXECUTION; 2264 } 2265 } 2266 2267 if (prev_uef_handler != NULL) { 2268 // We didn't handle this exception so pass it to the previous 2269 // UnhandledExceptionFilter. 2270 return (prev_uef_handler)(exceptionInfo); 2271 } 2272 #else // !_WIN64 2273 // On Windows, the mxcsr control bits are non-volatile across calls 2274 // See also CR 6192333 2275 // 2276 jint MxCsr = INITIAL_MXCSR; 2277 // we can't use StubRoutines::addr_mxcsr_std() 2278 // because in Win64 mxcsr is not saved there 2279 if (MxCsr != ctx->MxCsr) { 2280 ctx->MxCsr = MxCsr; 2281 return EXCEPTION_CONTINUE_EXECUTION; 2282 } 2283 #endif // !_WIN64 2284 2285 return EXCEPTION_CONTINUE_SEARCH; 2286 } 2287 2288 static inline void report_error(Thread* t, DWORD exception_code, 2289 address addr, void* siginfo, void* context) { 2290 VMError err(t, exception_code, addr, siginfo, context); 2291 err.report_and_die(); 2292 2293 // If UseOsErrorReporting, this will return here and save the error file 2294 // somewhere where we can find it in the minidump. 2295 } 2296 2297 //----------------------------------------------------------------------------- 2298 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2299 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2300 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2301 #ifdef _M_IA64 2302 // On Itanium, we need the "precise pc", which has the slot number coded 2303 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format). 2304 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress; 2305 // Convert the pc to "Unix format", which has the slot number coded 2306 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2 2307 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction" 2308 // information is saved in the Unix format. 2309 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2)); 2310 #elif _M_AMD64 2311 address pc = (address) exceptionInfo->ContextRecord->Rip; 2312 #else 2313 address pc = (address) exceptionInfo->ContextRecord->Eip; 2314 #endif 2315 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 2316 2317 // Handle SafeFetch32 and SafeFetchN exceptions. 2318 if (StubRoutines::is_safefetch_fault(pc)) { 2319 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc)); 2320 } 2321 2322 #ifndef _WIN64 2323 // Execution protection violation - win32 running on AMD64 only 2324 // Handled first to avoid misdiagnosis as a "normal" access violation; 2325 // This is safe to do because we have a new/unique ExceptionInformation 2326 // code for this condition. 2327 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2328 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2329 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2330 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2331 2332 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2333 int page_size = os::vm_page_size(); 2334 2335 // Make sure the pc and the faulting address are sane. 2336 // 2337 // If an instruction spans a page boundary, and the page containing 2338 // the beginning of the instruction is executable but the following 2339 // page is not, the pc and the faulting address might be slightly 2340 // different - we still want to unguard the 2nd page in this case. 2341 // 2342 // 15 bytes seems to be a (very) safe value for max instruction size. 2343 bool pc_is_near_addr = 2344 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2345 bool instr_spans_page_boundary = 2346 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2347 (intptr_t) page_size) > 0); 2348 2349 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2350 static volatile address last_addr = 2351 (address) os::non_memory_address_word(); 2352 2353 // In conservative mode, don't unguard unless the address is in the VM 2354 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2355 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2356 2357 // Set memory to RWX and retry 2358 address page_start = 2359 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2360 bool res = os::protect_memory((char*) page_start, page_size, 2361 os::MEM_PROT_RWX); 2362 2363 if (PrintMiscellaneous && Verbose) { 2364 char buf[256]; 2365 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 2366 "at " INTPTR_FORMAT 2367 ", unguarding " INTPTR_FORMAT ": %s", addr, 2368 page_start, (res ? "success" : strerror(errno))); 2369 tty->print_raw_cr(buf); 2370 } 2371 2372 // Set last_addr so if we fault again at the same address, we don't 2373 // end up in an endless loop. 2374 // 2375 // There are two potential complications here. Two threads trapping 2376 // at the same address at the same time could cause one of the 2377 // threads to think it already unguarded, and abort the VM. Likely 2378 // very rare. 2379 // 2380 // The other race involves two threads alternately trapping at 2381 // different addresses and failing to unguard the page, resulting in 2382 // an endless loop. This condition is probably even more unlikely 2383 // than the first. 2384 // 2385 // Although both cases could be avoided by using locks or thread 2386 // local last_addr, these solutions are unnecessary complication: 2387 // this handler is a best-effort safety net, not a complete solution. 2388 // It is disabled by default and should only be used as a workaround 2389 // in case we missed any no-execute-unsafe VM code. 2390 2391 last_addr = addr; 2392 2393 return EXCEPTION_CONTINUE_EXECUTION; 2394 } 2395 } 2396 2397 // Last unguard failed or not unguarding 2398 tty->print_raw_cr("Execution protection violation"); 2399 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2400 exceptionInfo->ContextRecord); 2401 return EXCEPTION_CONTINUE_SEARCH; 2402 } 2403 } 2404 #endif // _WIN64 2405 2406 // Check to see if we caught the safepoint code in the 2407 // process of write protecting the memory serialization page. 2408 // It write enables the page immediately after protecting it 2409 // so just return. 2410 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2411 JavaThread* thread = (JavaThread*) t; 2412 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2413 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2414 if (os::is_memory_serialize_page(thread, addr)) { 2415 // Block current thread until the memory serialize page permission restored. 2416 os::block_on_serialize_page_trap(); 2417 return EXCEPTION_CONTINUE_EXECUTION; 2418 } 2419 } 2420 2421 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) && 2422 VM_Version::is_cpuinfo_segv_addr(pc)) { 2423 // Verify that OS save/restore AVX registers. 2424 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr()); 2425 } 2426 2427 if (t != NULL && t->is_Java_thread()) { 2428 JavaThread* thread = (JavaThread*) t; 2429 bool in_java = thread->thread_state() == _thread_in_Java; 2430 2431 // Handle potential stack overflows up front. 2432 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2433 if (os::uses_stack_guard_pages()) { 2434 #ifdef _M_IA64 2435 // Use guard page for register stack. 2436 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2437 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2438 // Check for a register stack overflow on Itanium 2439 if (thread->addr_inside_register_stack_red_zone(addr)) { 2440 // Fatal red zone violation happens if the Java program 2441 // catches a StackOverflow error and does so much processing 2442 // that it runs beyond the unprotected yellow guard zone. As 2443 // a result, we are out of here. 2444 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit."); 2445 } else if(thread->addr_inside_register_stack(addr)) { 2446 // Disable the yellow zone which sets the state that 2447 // we've got a stack overflow problem. 2448 if (thread->stack_yellow_zone_enabled()) { 2449 thread->disable_stack_yellow_zone(); 2450 } 2451 // Give us some room to process the exception. 2452 thread->disable_register_stack_guard(); 2453 // Tracing with +Verbose. 2454 if (Verbose) { 2455 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc); 2456 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr); 2457 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base()); 2458 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]", 2459 thread->register_stack_base(), 2460 thread->register_stack_base() + thread->stack_size()); 2461 } 2462 2463 // Reguard the permanent register stack red zone just to be sure. 2464 // We saw Windows silently disabling this without telling us. 2465 thread->enable_register_stack_red_zone(); 2466 2467 return Handle_Exception(exceptionInfo, 2468 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2469 } 2470 #endif 2471 if (thread->stack_yellow_zone_enabled()) { 2472 // Yellow zone violation. The o/s has unprotected the first yellow 2473 // zone page for us. Note: must call disable_stack_yellow_zone to 2474 // update the enabled status, even if the zone contains only one page. 2475 thread->disable_stack_yellow_zone(); 2476 // If not in java code, return and hope for the best. 2477 return in_java 2478 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2479 : EXCEPTION_CONTINUE_EXECUTION; 2480 } else { 2481 // Fatal red zone violation. 2482 thread->disable_stack_red_zone(); 2483 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2484 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2485 exceptionInfo->ContextRecord); 2486 return EXCEPTION_CONTINUE_SEARCH; 2487 } 2488 } else if (in_java) { 2489 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2490 // a one-time-only guard page, which it has released to us. The next 2491 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2492 return Handle_Exception(exceptionInfo, 2493 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2494 } else { 2495 // Can only return and hope for the best. Further stack growth will 2496 // result in an ACCESS_VIOLATION. 2497 return EXCEPTION_CONTINUE_EXECUTION; 2498 } 2499 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2500 // Either stack overflow or null pointer exception. 2501 if (in_java) { 2502 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2503 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2504 address stack_end = thread->stack_base() - thread->stack_size(); 2505 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2506 // Stack overflow. 2507 assert(!os::uses_stack_guard_pages(), 2508 "should be caught by red zone code above."); 2509 return Handle_Exception(exceptionInfo, 2510 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2511 } 2512 // Check for safepoint polling and implicit null 2513 // We only expect null pointers in the stubs (vtable) 2514 // the rest are checked explicitly now. 2515 CodeBlob* cb = CodeCache::find_blob(pc); 2516 if (cb != NULL) { 2517 if (os::is_poll_address(addr)) { 2518 address stub = SharedRuntime::get_poll_stub(pc); 2519 return Handle_Exception(exceptionInfo, stub); 2520 } 2521 } 2522 { 2523 #ifdef _WIN64 2524 // If it's a legal stack address map the entire region in 2525 // 2526 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2527 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2528 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) { 2529 addr = (address)((uintptr_t)addr & 2530 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2531 os::commit_memory((char *)addr, thread->stack_base() - addr, 2532 !ExecMem); 2533 return EXCEPTION_CONTINUE_EXECUTION; 2534 } else 2535 #endif 2536 { 2537 // Null pointer exception. 2538 #ifdef _M_IA64 2539 // Process implicit null checks in compiled code. Note: Implicit null checks 2540 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs. 2541 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) { 2542 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format); 2543 // Handle implicit null check in UEP method entry 2544 if (cb && (cb->is_frame_complete_at(pc) || 2545 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) { 2546 if (Verbose) { 2547 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0); 2548 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format); 2549 tty->print_cr(" to addr " INTPTR_FORMAT, addr); 2550 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)", 2551 *(bundle_start + 1), *bundle_start); 2552 } 2553 return Handle_Exception(exceptionInfo, 2554 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL)); 2555 } 2556 } 2557 2558 // Implicit null checks were processed above. Hence, we should not reach 2559 // here in the usual case => die! 2560 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception"); 2561 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2562 exceptionInfo->ContextRecord); 2563 return EXCEPTION_CONTINUE_SEARCH; 2564 2565 #else // !IA64 2566 2567 // Windows 98 reports faulting addresses incorrectly 2568 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2569 !os::win32::is_nt()) { 2570 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2571 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2572 } 2573 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2574 exceptionInfo->ContextRecord); 2575 return EXCEPTION_CONTINUE_SEARCH; 2576 #endif 2577 } 2578 } 2579 } 2580 2581 #ifdef _WIN64 2582 // Special care for fast JNI field accessors. 2583 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2584 // in and the heap gets shrunk before the field access. 2585 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2586 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2587 if (addr != (address)-1) { 2588 return Handle_Exception(exceptionInfo, addr); 2589 } 2590 } 2591 #endif 2592 2593 // Stack overflow or null pointer exception in native code. 2594 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2595 exceptionInfo->ContextRecord); 2596 return EXCEPTION_CONTINUE_SEARCH; 2597 } // /EXCEPTION_ACCESS_VIOLATION 2598 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2599 #if defined _M_IA64 2600 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION || 2601 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) { 2602 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0); 2603 2604 // Compiled method patched to be non entrant? Following conditions must apply: 2605 // 1. must be first instruction in bundle 2606 // 2. must be a break instruction with appropriate code 2607 if ((((uint64_t) pc & 0x0F) == 0) && 2608 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) { 2609 return Handle_Exception(exceptionInfo, 2610 (address)SharedRuntime::get_handle_wrong_method_stub()); 2611 } 2612 } // /EXCEPTION_ILLEGAL_INSTRUCTION 2613 #endif 2614 2615 2616 if (in_java) { 2617 switch (exception_code) { 2618 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2619 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2620 2621 case EXCEPTION_INT_OVERFLOW: 2622 return Handle_IDiv_Exception(exceptionInfo); 2623 2624 } // switch 2625 } 2626 if (((thread->thread_state() == _thread_in_Java) || 2627 (thread->thread_state() == _thread_in_native)) && 2628 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) { 2629 LONG result=Handle_FLT_Exception(exceptionInfo); 2630 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2631 } 2632 } 2633 2634 if (exception_code != EXCEPTION_BREAKPOINT) { 2635 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2636 exceptionInfo->ContextRecord); 2637 } 2638 return EXCEPTION_CONTINUE_SEARCH; 2639 } 2640 2641 #ifndef _WIN64 2642 // Special care for fast JNI accessors. 2643 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2644 // the heap gets shrunk before the field access. 2645 // Need to install our own structured exception handler since native code may 2646 // install its own. 2647 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2648 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2649 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2650 address pc = (address) exceptionInfo->ContextRecord->Eip; 2651 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2652 if (addr != (address)-1) { 2653 return Handle_Exception(exceptionInfo, addr); 2654 } 2655 } 2656 return EXCEPTION_CONTINUE_SEARCH; 2657 } 2658 2659 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \ 2660 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \ 2661 jobject obj, \ 2662 jfieldID fieldID) { \ 2663 __try { \ 2664 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \ 2665 obj, \ 2666 fieldID); \ 2667 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \ 2668 _exception_info())) { \ 2669 } \ 2670 return 0; \ 2671 } 2672 2673 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2674 DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2675 DEFINE_FAST_GETFIELD(jchar, char, Char) 2676 DEFINE_FAST_GETFIELD(jshort, short, Short) 2677 DEFINE_FAST_GETFIELD(jint, int, Int) 2678 DEFINE_FAST_GETFIELD(jlong, long, Long) 2679 DEFINE_FAST_GETFIELD(jfloat, float, Float) 2680 DEFINE_FAST_GETFIELD(jdouble, double, Double) 2681 2682 address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2683 switch (type) { 2684 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2685 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2686 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2687 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2688 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2689 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2690 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2691 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2692 default: ShouldNotReachHere(); 2693 } 2694 return (address)-1; 2695 } 2696 #endif 2697 2698 void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) { 2699 // Install a win32 structured exception handler around the test 2700 // function call so the VM can generate an error dump if needed. 2701 __try { 2702 (*funcPtr)(); 2703 } __except(topLevelExceptionFilter( 2704 (_EXCEPTION_POINTERS*)_exception_info())) { 2705 // Nothing to do. 2706 } 2707 } 2708 2709 // Virtual Memory 2710 2711 int os::vm_page_size() { return os::win32::vm_page_size(); } 2712 int os::vm_allocation_granularity() { 2713 return os::win32::vm_allocation_granularity(); 2714 } 2715 2716 // Windows large page support is available on Windows 2003. In order to use 2717 // large page memory, the administrator must first assign additional privilege 2718 // to the user: 2719 // + select Control Panel -> Administrative Tools -> Local Security Policy 2720 // + select Local Policies -> User Rights Assignment 2721 // + double click "Lock pages in memory", add users and/or groups 2722 // + reboot 2723 // Note the above steps are needed for administrator as well, as administrators 2724 // by default do not have the privilege to lock pages in memory. 2725 // 2726 // Note about Windows 2003: although the API supports committing large page 2727 // memory on a page-by-page basis and VirtualAlloc() returns success under this 2728 // scenario, I found through experiment it only uses large page if the entire 2729 // memory region is reserved and committed in a single VirtualAlloc() call. 2730 // This makes Windows large page support more or less like Solaris ISM, in 2731 // that the entire heap must be committed upfront. This probably will change 2732 // in the future, if so the code below needs to be revisited. 2733 2734 #ifndef MEM_LARGE_PAGES 2735 #define MEM_LARGE_PAGES 0x20000000 2736 #endif 2737 2738 static HANDLE _hProcess; 2739 static HANDLE _hToken; 2740 2741 // Container for NUMA node list info 2742 class NUMANodeListHolder { 2743 private: 2744 int *_numa_used_node_list; // allocated below 2745 int _numa_used_node_count; 2746 2747 void free_node_list() { 2748 if (_numa_used_node_list != NULL) { 2749 FREE_C_HEAP_ARRAY(int, _numa_used_node_list); 2750 } 2751 } 2752 2753 public: 2754 NUMANodeListHolder() { 2755 _numa_used_node_count = 0; 2756 _numa_used_node_list = NULL; 2757 // do rest of initialization in build routine (after function pointers are set up) 2758 } 2759 2760 ~NUMANodeListHolder() { 2761 free_node_list(); 2762 } 2763 2764 bool build() { 2765 DWORD_PTR proc_aff_mask; 2766 DWORD_PTR sys_aff_mask; 2767 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false; 2768 ULONG highest_node_number; 2769 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false; 2770 free_node_list(); 2771 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal); 2772 for (unsigned int i = 0; i <= highest_node_number; i++) { 2773 ULONGLONG proc_mask_numa_node; 2774 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false; 2775 if ((proc_aff_mask & proc_mask_numa_node)!=0) { 2776 _numa_used_node_list[_numa_used_node_count++] = i; 2777 } 2778 } 2779 return (_numa_used_node_count > 1); 2780 } 2781 2782 int get_count() { return _numa_used_node_count; } 2783 int get_node_list_entry(int n) { 2784 // for indexes out of range, returns -1 2785 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1); 2786 } 2787 2788 } numa_node_list_holder; 2789 2790 2791 2792 static size_t _large_page_size = 0; 2793 2794 static bool resolve_functions_for_large_page_init() { 2795 return os::Kernel32Dll::GetLargePageMinimumAvailable() && 2796 os::Advapi32Dll::AdvapiAvailable(); 2797 } 2798 2799 static bool request_lock_memory_privilege() { 2800 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2801 os::current_process_id()); 2802 2803 LUID luid; 2804 if (_hProcess != NULL && 2805 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2806 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2807 2808 TOKEN_PRIVILEGES tp; 2809 tp.PrivilegeCount = 1; 2810 tp.Privileges[0].Luid = luid; 2811 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2812 2813 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2814 // privilege. Check GetLastError() too. See MSDN document. 2815 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2816 (GetLastError() == ERROR_SUCCESS)) { 2817 return true; 2818 } 2819 } 2820 2821 return false; 2822 } 2823 2824 static void cleanup_after_large_page_init() { 2825 if (_hProcess) CloseHandle(_hProcess); 2826 _hProcess = NULL; 2827 if (_hToken) CloseHandle(_hToken); 2828 _hToken = NULL; 2829 } 2830 2831 static bool numa_interleaving_init() { 2832 bool success = false; 2833 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving); 2834 2835 // print a warning if UseNUMAInterleaving flag is specified on command line 2836 bool warn_on_failure = use_numa_interleaving_specified; 2837 #define WARN(msg) if (warn_on_failure) { warning(msg); } 2838 2839 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages) 2840 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2841 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity); 2842 2843 if (os::Kernel32Dll::NumaCallsAvailable()) { 2844 if (numa_node_list_holder.build()) { 2845 if (PrintMiscellaneous && Verbose) { 2846 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count()); 2847 for (int i = 0; i < numa_node_list_holder.get_count(); i++) { 2848 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i)); 2849 } 2850 tty->print("\n"); 2851 } 2852 success = true; 2853 } else { 2854 WARN("Process does not cover multiple NUMA nodes."); 2855 } 2856 } else { 2857 WARN("NUMA Interleaving is not supported by the operating system."); 2858 } 2859 if (!success) { 2860 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag."); 2861 } 2862 return success; 2863 #undef WARN 2864 } 2865 2866 // this routine is used whenever we need to reserve a contiguous VA range 2867 // but we need to make separate VirtualAlloc calls for each piece of the range 2868 // Reasons for doing this: 2869 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise) 2870 // * UseNUMAInterleaving requires a separate node for each piece 2871 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, 2872 DWORD prot, 2873 bool should_inject_error = false) { 2874 char * p_buf; 2875 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size 2876 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2877 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size; 2878 2879 // first reserve enough address space in advance since we want to be 2880 // able to break a single contiguous virtual address range into multiple 2881 // large page commits but WS2003 does not allow reserving large page space 2882 // so we just use 4K pages for reserve, this gives us a legal contiguous 2883 // address space. then we will deallocate that reservation, and re alloc 2884 // using large pages 2885 const size_t size_of_reserve = bytes + chunk_size; 2886 if (bytes > size_of_reserve) { 2887 // Overflowed. 2888 return NULL; 2889 } 2890 p_buf = (char *) VirtualAlloc(addr, 2891 size_of_reserve, // size of Reserve 2892 MEM_RESERVE, 2893 PAGE_READWRITE); 2894 // If reservation failed, return NULL 2895 if (p_buf == NULL) return NULL; 2896 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC); 2897 os::release_memory(p_buf, bytes + chunk_size); 2898 2899 // we still need to round up to a page boundary (in case we are using large pages) 2900 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size) 2901 // instead we handle this in the bytes_to_rq computation below 2902 p_buf = (char *) align_size_up((size_t)p_buf, page_size); 2903 2904 // now go through and allocate one chunk at a time until all bytes are 2905 // allocated 2906 size_t bytes_remaining = bytes; 2907 // An overflow of align_size_up() would have been caught above 2908 // in the calculation of size_of_reserve. 2909 char * next_alloc_addr = p_buf; 2910 HANDLE hProc = GetCurrentProcess(); 2911 2912 #ifdef ASSERT 2913 // Variable for the failure injection 2914 long ran_num = os::random(); 2915 size_t fail_after = ran_num % bytes; 2916 #endif 2917 2918 int count=0; 2919 while (bytes_remaining) { 2920 // select bytes_to_rq to get to the next chunk_size boundary 2921 2922 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size)); 2923 // Note allocate and commit 2924 char * p_new; 2925 2926 #ifdef ASSERT 2927 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after); 2928 #else 2929 const bool inject_error_now = false; 2930 #endif 2931 2932 if (inject_error_now) { 2933 p_new = NULL; 2934 } else { 2935 if (!UseNUMAInterleaving) { 2936 p_new = (char *) VirtualAlloc(next_alloc_addr, 2937 bytes_to_rq, 2938 flags, 2939 prot); 2940 } else { 2941 // get the next node to use from the used_node_list 2942 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected"); 2943 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count()); 2944 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc, 2945 next_alloc_addr, 2946 bytes_to_rq, 2947 flags, 2948 prot, 2949 node); 2950 } 2951 } 2952 2953 if (p_new == NULL) { 2954 // Free any allocated pages 2955 if (next_alloc_addr > p_buf) { 2956 // Some memory was committed so release it. 2957 size_t bytes_to_release = bytes - bytes_remaining; 2958 // NMT has yet to record any individual blocks, so it 2959 // need to create a dummy 'reserve' record to match 2960 // the release. 2961 MemTracker::record_virtual_memory_reserve((address)p_buf, 2962 bytes_to_release, CALLER_PC); 2963 os::release_memory(p_buf, bytes_to_release); 2964 } 2965 #ifdef ASSERT 2966 if (should_inject_error) { 2967 if (TracePageSizes && Verbose) { 2968 tty->print_cr("Reserving pages individually failed."); 2969 } 2970 } 2971 #endif 2972 return NULL; 2973 } 2974 2975 bytes_remaining -= bytes_to_rq; 2976 next_alloc_addr += bytes_to_rq; 2977 count++; 2978 } 2979 // Although the memory is allocated individually, it is returned as one. 2980 // NMT records it as one block. 2981 if ((flags & MEM_COMMIT) != 0) { 2982 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC); 2983 } else { 2984 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC); 2985 } 2986 2987 // made it this far, success 2988 return p_buf; 2989 } 2990 2991 2992 2993 void os::large_page_init() { 2994 if (!UseLargePages) return; 2995 2996 // print a warning if any large page related flag is specified on command line 2997 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2998 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2999 bool success = false; 3000 3001 #define WARN(msg) if (warn_on_failure) { warning(msg); } 3002 if (resolve_functions_for_large_page_init()) { 3003 if (request_lock_memory_privilege()) { 3004 size_t s = os::Kernel32Dll::GetLargePageMinimum(); 3005 if (s) { 3006 #if defined(IA32) || defined(AMD64) 3007 if (s > 4*M || LargePageSizeInBytes > 4*M) { 3008 WARN("JVM cannot use large pages bigger than 4mb."); 3009 } else { 3010 #endif 3011 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 3012 _large_page_size = LargePageSizeInBytes; 3013 } else { 3014 _large_page_size = s; 3015 } 3016 success = true; 3017 #if defined(IA32) || defined(AMD64) 3018 } 3019 #endif 3020 } else { 3021 WARN("Large page is not supported by the processor."); 3022 } 3023 } else { 3024 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 3025 } 3026 } else { 3027 WARN("Large page is not supported by the operating system."); 3028 } 3029 #undef WARN 3030 3031 const size_t default_page_size = (size_t) vm_page_size(); 3032 if (success && _large_page_size > default_page_size) { 3033 _page_sizes[0] = _large_page_size; 3034 _page_sizes[1] = default_page_size; 3035 _page_sizes[2] = 0; 3036 } 3037 3038 cleanup_after_large_page_init(); 3039 UseLargePages = success; 3040 } 3041 3042 // On win32, one cannot release just a part of reserved memory, it's an 3043 // all or nothing deal. When we split a reservation, we must break the 3044 // reservation into two reservations. 3045 void os::pd_split_reserved_memory(char *base, size_t size, size_t split, 3046 bool realloc) { 3047 if (size > 0) { 3048 release_memory(base, size); 3049 if (realloc) { 3050 reserve_memory(split, base); 3051 } 3052 if (size != split) { 3053 reserve_memory(size - split, base + split); 3054 } 3055 } 3056 } 3057 3058 // Multiple threads can race in this code but it's not possible to unmap small sections of 3059 // virtual space to get requested alignment, like posix-like os's. 3060 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe. 3061 char* os::reserve_memory_aligned(size_t size, size_t alignment) { 3062 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 3063 "Alignment must be a multiple of allocation granularity (page size)"); 3064 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 3065 3066 size_t extra_size = size + alignment; 3067 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 3068 3069 char* aligned_base = NULL; 3070 3071 do { 3072 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 3073 if (extra_base == NULL) { 3074 return NULL; 3075 } 3076 // Do manual alignment 3077 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 3078 3079 os::release_memory(extra_base, extra_size); 3080 3081 aligned_base = os::reserve_memory(size, aligned_base); 3082 3083 } while (aligned_base == NULL); 3084 3085 return aligned_base; 3086 } 3087 3088 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 3089 assert((size_t)addr % os::vm_allocation_granularity() == 0, 3090 "reserve alignment"); 3091 assert(bytes % os::vm_page_size() == 0, "reserve page size"); 3092 char* res; 3093 // note that if UseLargePages is on, all the areas that require interleaving 3094 // will go thru reserve_memory_special rather than thru here. 3095 bool use_individual = (UseNUMAInterleaving && !UseLargePages); 3096 if (!use_individual) { 3097 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 3098 } else { 3099 elapsedTimer reserveTimer; 3100 if (Verbose && PrintMiscellaneous) reserveTimer.start(); 3101 // in numa interleaving, we have to allocate pages individually 3102 // (well really chunks of NUMAInterleaveGranularity size) 3103 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE); 3104 if (res == NULL) { 3105 warning("NUMA page allocation failed"); 3106 } 3107 if (Verbose && PrintMiscellaneous) { 3108 reserveTimer.stop(); 3109 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes, 3110 reserveTimer.milliseconds(), reserveTimer.ticks()); 3111 } 3112 } 3113 assert(res == NULL || addr == NULL || addr == res, 3114 "Unexpected address from reserve."); 3115 3116 return res; 3117 } 3118 3119 // Reserve memory at an arbitrary address, only if that area is 3120 // available (and not reserved for something else). 3121 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3122 // Windows os::reserve_memory() fails of the requested address range is 3123 // not avilable. 3124 return reserve_memory(bytes, requested_addr); 3125 } 3126 3127 size_t os::large_page_size() { 3128 return _large_page_size; 3129 } 3130 3131 bool os::can_commit_large_page_memory() { 3132 // Windows only uses large page memory when the entire region is reserved 3133 // and committed in a single VirtualAlloc() call. This may change in the 3134 // future, but with Windows 2003 it's not possible to commit on demand. 3135 return false; 3136 } 3137 3138 bool os::can_execute_large_page_memory() { 3139 return true; 3140 } 3141 3142 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, 3143 bool exec) { 3144 assert(UseLargePages, "only for large pages"); 3145 3146 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { 3147 return NULL; // Fallback to small pages. 3148 } 3149 3150 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 3151 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3152 3153 // with large pages, there are two cases where we need to use Individual Allocation 3154 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003) 3155 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page 3156 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) { 3157 if (TracePageSizes && Verbose) { 3158 tty->print_cr("Reserving large pages individually."); 3159 } 3160 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError); 3161 if (p_buf == NULL) { 3162 // give an appropriate warning message 3163 if (UseNUMAInterleaving) { 3164 warning("NUMA large page allocation failed, UseLargePages flag ignored"); 3165 } 3166 if (UseLargePagesIndividualAllocation) { 3167 warning("Individually allocated large pages failed, " 3168 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 3169 } 3170 return NULL; 3171 } 3172 3173 return p_buf; 3174 3175 } else { 3176 if (TracePageSizes && Verbose) { 3177 tty->print_cr("Reserving large pages in a single large chunk."); 3178 } 3179 // normal policy just allocate it all at once 3180 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3181 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); 3182 if (res != NULL) { 3183 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC); 3184 } 3185 3186 return res; 3187 } 3188 } 3189 3190 bool os::release_memory_special(char* base, size_t bytes) { 3191 assert(base != NULL, "Sanity check"); 3192 return release_memory(base, bytes); 3193 } 3194 3195 void os::print_statistics() { 3196 } 3197 3198 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) { 3199 int err = os::get_last_error(); 3200 char buf[256]; 3201 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3202 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 3203 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3204 exec, buf_len != 0 ? buf : "<no_error_string>", err); 3205 } 3206 3207 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 3208 if (bytes == 0) { 3209 // Don't bother the OS with noops. 3210 return true; 3211 } 3212 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 3213 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 3214 // Don't attempt to print anything if the OS call fails. We're 3215 // probably low on resources, so the print itself may cause crashes. 3216 3217 // unless we have NUMAInterleaving enabled, the range of a commit 3218 // is always within a reserve covered by a single VirtualAlloc 3219 // in that case we can just do a single commit for the requested size 3220 if (!UseNUMAInterleaving) { 3221 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) { 3222 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3223 return false; 3224 } 3225 if (exec) { 3226 DWORD oldprot; 3227 // Windows doc says to use VirtualProtect to get execute permissions 3228 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) { 3229 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3230 return false; 3231 } 3232 } 3233 return true; 3234 } else { 3235 3236 // when NUMAInterleaving is enabled, the commit might cover a range that 3237 // came from multiple VirtualAlloc reserves (using allocate_pages_individually). 3238 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery 3239 // returns represents the number of bytes that can be committed in one step. 3240 size_t bytes_remaining = bytes; 3241 char * next_alloc_addr = addr; 3242 while (bytes_remaining > 0) { 3243 MEMORY_BASIC_INFORMATION alloc_info; 3244 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info)); 3245 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3246 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, 3247 PAGE_READWRITE) == NULL) { 3248 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3249 exec);) 3250 return false; 3251 } 3252 if (exec) { 3253 DWORD oldprot; 3254 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, 3255 PAGE_EXECUTE_READWRITE, &oldprot)) { 3256 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3257 exec);) 3258 return false; 3259 } 3260 } 3261 bytes_remaining -= bytes_to_rq; 3262 next_alloc_addr += bytes_to_rq; 3263 } 3264 } 3265 // if we made it this far, return true 3266 return true; 3267 } 3268 3269 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 3270 bool exec) { 3271 // alignment_hint is ignored on this OS 3272 return pd_commit_memory(addr, size, exec); 3273 } 3274 3275 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 3276 const char* mesg) { 3277 assert(mesg != NULL, "mesg must be specified"); 3278 if (!pd_commit_memory(addr, size, exec)) { 3279 warn_fail_commit_memory(addr, size, exec); 3280 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); 3281 } 3282 } 3283 3284 void os::pd_commit_memory_or_exit(char* addr, size_t size, 3285 size_t alignment_hint, bool exec, 3286 const char* mesg) { 3287 // alignment_hint is ignored on this OS 3288 pd_commit_memory_or_exit(addr, size, exec, mesg); 3289 } 3290 3291 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3292 if (bytes == 0) { 3293 // Don't bother the OS with noops. 3294 return true; 3295 } 3296 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 3297 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 3298 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0); 3299 } 3300 3301 bool os::pd_release_memory(char* addr, size_t bytes) { 3302 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 3303 } 3304 3305 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 3306 return os::commit_memory(addr, size, !ExecMem); 3307 } 3308 3309 bool os::remove_stack_guard_pages(char* addr, size_t size) { 3310 return os::uncommit_memory(addr, size); 3311 } 3312 3313 // Set protections specified 3314 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3315 bool is_committed) { 3316 unsigned int p = 0; 3317 switch (prot) { 3318 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 3319 case MEM_PROT_READ: p = PAGE_READONLY; break; 3320 case MEM_PROT_RW: p = PAGE_READWRITE; break; 3321 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 3322 default: 3323 ShouldNotReachHere(); 3324 } 3325 3326 DWORD old_status; 3327 3328 // Strange enough, but on Win32 one can change protection only for committed 3329 // memory, not a big deal anyway, as bytes less or equal than 64K 3330 if (!is_committed) { 3331 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX, 3332 "cannot commit protection page"); 3333 } 3334 // One cannot use os::guard_memory() here, as on Win32 guard page 3335 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 3336 // 3337 // Pages in the region become guard pages. Any attempt to access a guard page 3338 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 3339 // the guard page status. Guard pages thus act as a one-time access alarm. 3340 return VirtualProtect(addr, bytes, p, &old_status) != 0; 3341 } 3342 3343 bool os::guard_memory(char* addr, size_t bytes) { 3344 DWORD old_status; 3345 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 3346 } 3347 3348 bool os::unguard_memory(char* addr, size_t bytes) { 3349 DWORD old_status; 3350 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 3351 } 3352 3353 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3354 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3355 void os::numa_make_global(char *addr, size_t bytes) { } 3356 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 3357 bool os::numa_topology_changed() { return false; } 3358 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); } 3359 int os::numa_get_group_id() { return 0; } 3360 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 3361 if (numa_node_list_holder.get_count() == 0 && size > 0) { 3362 // Provide an answer for UMA systems 3363 ids[0] = 0; 3364 return 1; 3365 } else { 3366 // check for size bigger than actual groups_num 3367 size = MIN2(size, numa_get_groups_num()); 3368 for (int i = 0; i < (int)size; i++) { 3369 ids[i] = numa_node_list_holder.get_node_list_entry(i); 3370 } 3371 return size; 3372 } 3373 } 3374 3375 bool os::get_page_info(char *start, page_info* info) { 3376 return false; 3377 } 3378 3379 char *os::scan_pages(char *start, char* end, page_info* page_expected, 3380 page_info* page_found) { 3381 return end; 3382 } 3383 3384 char* os::non_memory_address_word() { 3385 // Must never look like an address returned by reserve_memory, 3386 // even in its subfields (as defined by the CPU immediate fields, 3387 // if the CPU splits constants across multiple instructions). 3388 return (char*)-1; 3389 } 3390 3391 #define MAX_ERROR_COUNT 100 3392 #define SYS_THREAD_ERROR 0xffffffffUL 3393 3394 void os::pd_start_thread(Thread* thread) { 3395 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 3396 // Returns previous suspend state: 3397 // 0: Thread was not suspended 3398 // 1: Thread is running now 3399 // >1: Thread is still suspended. 3400 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3401 } 3402 3403 class HighResolutionInterval : public CHeapObj<mtThread> { 3404 // The default timer resolution seems to be 10 milliseconds. 3405 // (Where is this written down?) 3406 // If someone wants to sleep for only a fraction of the default, 3407 // then we set the timer resolution down to 1 millisecond for 3408 // the duration of their interval. 3409 // We carefully set the resolution back, since otherwise we 3410 // seem to incur an overhead (3%?) that we don't need. 3411 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 3412 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 3413 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 3414 // timeBeginPeriod() if the relative error exceeded some threshold. 3415 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 3416 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 3417 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 3418 // resolution timers running. 3419 private: 3420 jlong resolution; 3421 public: 3422 HighResolutionInterval(jlong ms) { 3423 resolution = ms % 10L; 3424 if (resolution != 0) { 3425 MMRESULT result = timeBeginPeriod(1L); 3426 } 3427 } 3428 ~HighResolutionInterval() { 3429 if (resolution != 0) { 3430 MMRESULT result = timeEndPeriod(1L); 3431 } 3432 resolution = 0L; 3433 } 3434 }; 3435 3436 int os::sleep(Thread* thread, jlong ms, bool interruptable) { 3437 jlong limit = (jlong) MAXDWORD; 3438 3439 while (ms > limit) { 3440 int res; 3441 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) { 3442 return res; 3443 } 3444 ms -= limit; 3445 } 3446 3447 assert(thread == Thread::current(), "thread consistency check"); 3448 OSThread* osthread = thread->osthread(); 3449 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 3450 int result; 3451 if (interruptable) { 3452 assert(thread->is_Java_thread(), "must be java thread"); 3453 JavaThread *jt = (JavaThread *) thread; 3454 ThreadBlockInVM tbivm(jt); 3455 3456 jt->set_suspend_equivalent(); 3457 // cleared by handle_special_suspend_equivalent_condition() or 3458 // java_suspend_self() via check_and_wait_while_suspended() 3459 3460 HANDLE events[1]; 3461 events[0] = osthread->interrupt_event(); 3462 HighResolutionInterval *phri=NULL; 3463 if (!ForceTimeHighResolution) { 3464 phri = new HighResolutionInterval(ms); 3465 } 3466 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 3467 result = OS_TIMEOUT; 3468 } else { 3469 ResetEvent(osthread->interrupt_event()); 3470 osthread->set_interrupted(false); 3471 result = OS_INTRPT; 3472 } 3473 delete phri; //if it is NULL, harmless 3474 3475 // were we externally suspended while we were waiting? 3476 jt->check_and_wait_while_suspended(); 3477 } else { 3478 assert(!thread->is_Java_thread(), "must not be java thread"); 3479 Sleep((long) ms); 3480 result = OS_TIMEOUT; 3481 } 3482 return result; 3483 } 3484 3485 // Short sleep, direct OS call. 3486 // 3487 // ms = 0, means allow others (if any) to run. 3488 // 3489 void os::naked_short_sleep(jlong ms) { 3490 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3491 Sleep(ms); 3492 } 3493 3494 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3495 void os::infinite_sleep() { 3496 while (true) { // sleep forever ... 3497 Sleep(100000); // ... 100 seconds at a time 3498 } 3499 } 3500 3501 typedef BOOL (WINAPI * STTSignature)(void); 3502 3503 void os::naked_yield() { 3504 // Use either SwitchToThread() or Sleep(0) 3505 // Consider passing back the return value from SwitchToThread(). 3506 if (os::Kernel32Dll::SwitchToThreadAvailable()) { 3507 SwitchToThread(); 3508 } else { 3509 Sleep(0); 3510 } 3511 } 3512 3513 // Win32 only gives you access to seven real priorities at a time, 3514 // so we compress Java's ten down to seven. It would be better 3515 // if we dynamically adjusted relative priorities. 3516 3517 int os::java_to_os_priority[CriticalPriority + 1] = { 3518 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3519 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3520 THREAD_PRIORITY_LOWEST, // 2 3521 THREAD_PRIORITY_BELOW_NORMAL, // 3 3522 THREAD_PRIORITY_BELOW_NORMAL, // 4 3523 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3524 THREAD_PRIORITY_NORMAL, // 6 3525 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3526 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3527 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3528 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority 3529 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority 3530 }; 3531 3532 int prio_policy1[CriticalPriority + 1] = { 3533 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3534 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3535 THREAD_PRIORITY_LOWEST, // 2 3536 THREAD_PRIORITY_BELOW_NORMAL, // 3 3537 THREAD_PRIORITY_BELOW_NORMAL, // 4 3538 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3539 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3540 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3541 THREAD_PRIORITY_HIGHEST, // 8 3542 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3543 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority 3544 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority 3545 }; 3546 3547 static int prio_init() { 3548 // If ThreadPriorityPolicy is 1, switch tables 3549 if (ThreadPriorityPolicy == 1) { 3550 int i; 3551 for (i = 0; i < CriticalPriority + 1; i++) { 3552 os::java_to_os_priority[i] = prio_policy1[i]; 3553 } 3554 } 3555 if (UseCriticalJavaThreadPriority) { 3556 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 3557 } 3558 return 0; 3559 } 3560 3561 OSReturn os::set_native_priority(Thread* thread, int priority) { 3562 if (!UseThreadPriorities) return OS_OK; 3563 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3564 return ret ? OS_OK : OS_ERR; 3565 } 3566 3567 OSReturn os::get_native_priority(const Thread* const thread, 3568 int* priority_ptr) { 3569 if (!UseThreadPriorities) { 3570 *priority_ptr = java_to_os_priority[NormPriority]; 3571 return OS_OK; 3572 } 3573 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3574 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3575 assert(false, "GetThreadPriority failed"); 3576 return OS_ERR; 3577 } 3578 *priority_ptr = os_prio; 3579 return OS_OK; 3580 } 3581 3582 3583 // Hint to the underlying OS that a task switch would not be good. 3584 // Void return because it's a hint and can fail. 3585 void os::hint_no_preempt() {} 3586 3587 void os::interrupt(Thread* thread) { 3588 assert(!thread->is_Java_thread() || Thread::current() == thread || 3589 Threads_lock->owned_by_self(), 3590 "possibility of dangling Thread pointer"); 3591 3592 OSThread* osthread = thread->osthread(); 3593 osthread->set_interrupted(true); 3594 // More than one thread can get here with the same value of osthread, 3595 // resulting in multiple notifications. We do, however, want the store 3596 // to interrupted() to be visible to other threads before we post 3597 // the interrupt event. 3598 OrderAccess::release(); 3599 SetEvent(osthread->interrupt_event()); 3600 // For JSR166: unpark after setting status 3601 if (thread->is_Java_thread()) { 3602 ((JavaThread*)thread)->parker()->unpark(); 3603 } 3604 3605 ParkEvent * ev = thread->_ParkEvent; 3606 if (ev != NULL) ev->unpark(); 3607 } 3608 3609 3610 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3611 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3612 "possibility of dangling Thread pointer"); 3613 3614 OSThread* osthread = thread->osthread(); 3615 // There is no synchronization between the setting of the interrupt 3616 // and it being cleared here. It is critical - see 6535709 - that 3617 // we only clear the interrupt state, and reset the interrupt event, 3618 // if we are going to report that we were indeed interrupted - else 3619 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups 3620 // depending on the timing. By checking thread interrupt event to see 3621 // if the thread gets real interrupt thus prevent spurious wakeup. 3622 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0); 3623 if (interrupted && clear_interrupted) { 3624 osthread->set_interrupted(false); 3625 ResetEvent(osthread->interrupt_event()); 3626 } // Otherwise leave the interrupted state alone 3627 3628 return interrupted; 3629 } 3630 3631 // Get's a pc (hint) for a running thread. Currently used only for profiling. 3632 ExtendedPC os::get_thread_pc(Thread* thread) { 3633 CONTEXT context; 3634 context.ContextFlags = CONTEXT_CONTROL; 3635 HANDLE handle = thread->osthread()->thread_handle(); 3636 #ifdef _M_IA64 3637 assert(0, "Fix get_thread_pc"); 3638 return ExtendedPC(NULL); 3639 #else 3640 if (GetThreadContext(handle, &context)) { 3641 #ifdef _M_AMD64 3642 return ExtendedPC((address) context.Rip); 3643 #else 3644 return ExtendedPC((address) context.Eip); 3645 #endif 3646 } else { 3647 return ExtendedPC(NULL); 3648 } 3649 #endif 3650 } 3651 3652 // GetCurrentThreadId() returns DWORD 3653 intx os::current_thread_id() { return GetCurrentThreadId(); } 3654 3655 static int _initial_pid = 0; 3656 3657 int os::current_process_id() { 3658 return (_initial_pid ? _initial_pid : _getpid()); 3659 } 3660 3661 int os::win32::_vm_page_size = 0; 3662 int os::win32::_vm_allocation_granularity = 0; 3663 int os::win32::_processor_type = 0; 3664 // Processor level is not available on non-NT systems, use vm_version instead 3665 int os::win32::_processor_level = 0; 3666 julong os::win32::_physical_memory = 0; 3667 size_t os::win32::_default_stack_size = 0; 3668 3669 intx os::win32::_os_thread_limit = 0; 3670 volatile intx os::win32::_os_thread_count = 0; 3671 3672 bool os::win32::_is_nt = false; 3673 bool os::win32::_is_windows_2003 = false; 3674 bool os::win32::_is_windows_server = false; 3675 3676 // 6573254 3677 // Currently, the bug is observed across all the supported Windows releases, 3678 // including the latest one (as of this writing - Windows Server 2012 R2) 3679 bool os::win32::_has_exit_bug = true; 3680 bool os::win32::_has_performance_count = 0; 3681 3682 void os::win32::initialize_system_info() { 3683 SYSTEM_INFO si; 3684 GetSystemInfo(&si); 3685 _vm_page_size = si.dwPageSize; 3686 _vm_allocation_granularity = si.dwAllocationGranularity; 3687 _processor_type = si.dwProcessorType; 3688 _processor_level = si.wProcessorLevel; 3689 set_processor_count(si.dwNumberOfProcessors); 3690 3691 MEMORYSTATUSEX ms; 3692 ms.dwLength = sizeof(ms); 3693 3694 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3695 // dwMemoryLoad (% of memory in use) 3696 GlobalMemoryStatusEx(&ms); 3697 _physical_memory = ms.ullTotalPhys; 3698 3699 OSVERSIONINFOEX oi; 3700 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 3701 GetVersionEx((OSVERSIONINFO*)&oi); 3702 switch (oi.dwPlatformId) { 3703 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 3704 case VER_PLATFORM_WIN32_NT: 3705 _is_nt = true; 3706 { 3707 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3708 if (os_vers == 5002) { 3709 _is_windows_2003 = true; 3710 } 3711 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER || 3712 oi.wProductType == VER_NT_SERVER) { 3713 _is_windows_server = true; 3714 } 3715 } 3716 break; 3717 default: fatal("Unknown platform"); 3718 } 3719 3720 _default_stack_size = os::current_stack_size(); 3721 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3722 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3723 "stack size not a multiple of page size"); 3724 3725 initialize_performance_counter(); 3726 3727 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is 3728 // known to deadlock the system, if the VM issues to thread operations with 3729 // a too high frequency, e.g., such as changing the priorities. 3730 // The 6000 seems to work well - no deadlocks has been notices on the test 3731 // programs that we have seen experience this problem. 3732 if (!os::win32::is_nt()) { 3733 StarvationMonitorInterval = 6000; 3734 } 3735 } 3736 3737 3738 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, 3739 int ebuflen) { 3740 char path[MAX_PATH]; 3741 DWORD size; 3742 DWORD pathLen = (DWORD)sizeof(path); 3743 HINSTANCE result = NULL; 3744 3745 // only allow library name without path component 3746 assert(strchr(name, '\\') == NULL, "path not allowed"); 3747 assert(strchr(name, ':') == NULL, "path not allowed"); 3748 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) { 3749 jio_snprintf(ebuf, ebuflen, 3750 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name); 3751 return NULL; 3752 } 3753 3754 // search system directory 3755 if ((size = GetSystemDirectory(path, pathLen)) > 0) { 3756 if (size >= pathLen) { 3757 return NULL; // truncated 3758 } 3759 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3760 return NULL; // truncated 3761 } 3762 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3763 return result; 3764 } 3765 } 3766 3767 // try Windows directory 3768 if ((size = GetWindowsDirectory(path, pathLen)) > 0) { 3769 if (size >= pathLen) { 3770 return NULL; // truncated 3771 } 3772 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3773 return NULL; // truncated 3774 } 3775 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3776 return result; 3777 } 3778 } 3779 3780 jio_snprintf(ebuf, ebuflen, 3781 "os::win32::load_windows_dll() cannot load %s from system directories.", name); 3782 return NULL; 3783 } 3784 3785 #define EXIT_TIMEOUT PRODUCT_ONLY(1000) NOT_PRODUCT(4000) /* 1 sec in product, 4 sec in debug */ 3786 3787 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) { 3788 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect); 3789 return TRUE; 3790 } 3791 3792 int os::win32::exit_process_or_thread(Ept what, int exit_code) { 3793 // Basic approach: 3794 // - Each exiting thread registers its intent to exit and then does so. 3795 // - A thread trying to terminate the process must wait for all 3796 // threads currently exiting to complete their exit. 3797 3798 if (os::win32::has_exit_bug()) { 3799 // The array holds handles of the threads that have started exiting by calling 3800 // _endthreadex(). 3801 // Should be large enough to avoid blocking the exiting thread due to lack of 3802 // a free slot. 3803 static HANDLE handles[MAXIMUM_WAIT_OBJECTS]; 3804 static int handle_count = 0; 3805 3806 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT; 3807 static CRITICAL_SECTION crit_sect; 3808 int i, j; 3809 DWORD res; 3810 HANDLE hproc, hthr; 3811 3812 // The first thread that reached this point, initializes the critical section. 3813 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) { 3814 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__); 3815 } else { 3816 EnterCriticalSection(&crit_sect); 3817 3818 if (what == EPT_THREAD) { 3819 // Remove from the array those handles of the threads that have completed exiting. 3820 for (i = 0, j = 0; i < handle_count; ++i) { 3821 res = WaitForSingleObject(handles[i], 0 /* don't wait */); 3822 if (res == WAIT_TIMEOUT) { 3823 handles[j++] = handles[i]; 3824 } else { 3825 if (res == WAIT_FAILED) { 3826 warning("WaitForSingleObject failed (%u) in %s: %d\n", 3827 GetLastError(), __FILE__, __LINE__); 3828 } 3829 // Don't keep the handle, if we failed waiting for it. 3830 CloseHandle(handles[i]); 3831 } 3832 } 3833 3834 // If there's no free slot in the array of the kept handles, we'll have to 3835 // wait until at least one thread completes exiting. 3836 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) { 3837 // Raise the priority of the oldest exiting thread to increase its chances 3838 // to complete sooner. 3839 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL); 3840 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT); 3841 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) { 3842 i = (res - WAIT_OBJECT_0); 3843 handle_count = MAXIMUM_WAIT_OBJECTS - 1; 3844 for (; i < handle_count; ++i) { 3845 handles[i] = handles[i + 1]; 3846 } 3847 } else { 3848 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3849 (res == WAIT_FAILED ? "failed" : "timed out"), 3850 GetLastError(), __FILE__, __LINE__); 3851 // Don't keep handles, if we failed waiting for them. 3852 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) { 3853 CloseHandle(handles[i]); 3854 } 3855 handle_count = 0; 3856 } 3857 } 3858 3859 // Store a duplicate of the current thread handle in the array of handles. 3860 hproc = GetCurrentProcess(); 3861 hthr = GetCurrentThread(); 3862 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count], 3863 0, FALSE, DUPLICATE_SAME_ACCESS)) { 3864 warning("DuplicateHandle failed (%u) in %s: %d\n", 3865 GetLastError(), __FILE__, __LINE__); 3866 } else { 3867 ++handle_count; 3868 } 3869 3870 // The current exiting thread has stored its handle in the array, and now 3871 // should leave the critical section before calling _endthreadex(). 3872 3873 } else { // what != EPT_THREAD 3874 if (handle_count > 0) { 3875 // Before ending the process, make sure all the threads that had called 3876 // _endthreadex() completed. 3877 3878 // Set the priority level of the current thread to the same value as 3879 // the priority level of exiting threads. 3880 // This is to ensure it will be given a fair chance to execute if 3881 // the timeout expires. 3882 hthr = GetCurrentThread(); 3883 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL); 3884 for (i = 0; i < handle_count; ++i) { 3885 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL); 3886 } 3887 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT); 3888 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) { 3889 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3890 (res == WAIT_FAILED ? "failed" : "timed out"), 3891 GetLastError(), __FILE__, __LINE__); 3892 } 3893 for (i = 0; i < handle_count; ++i) { 3894 CloseHandle(handles[i]); 3895 } 3896 handle_count = 0; 3897 } 3898 3899 // End the process, not leaving critical section. 3900 // This makes sure no other thread executes exit-related code at the same 3901 // time, thus a race is avoided. 3902 if (what == EPT_PROCESS) { 3903 ::exit(exit_code); 3904 } else { 3905 _exit(exit_code); 3906 } 3907 } 3908 3909 LeaveCriticalSection(&crit_sect); 3910 } 3911 } 3912 3913 // We are here if either 3914 // - there's no 'race at exit' bug on this OS release; 3915 // - initialization of the critical section failed (unlikely); 3916 // - the current thread has stored its handle and left the critical section. 3917 if (what == EPT_THREAD) { 3918 _endthreadex((unsigned)exit_code); 3919 } else if (what == EPT_PROCESS) { 3920 ::exit(exit_code); 3921 } else { 3922 _exit(exit_code); 3923 } 3924 3925 // Should not reach here 3926 return exit_code; 3927 } 3928 3929 #undef EXIT_TIMEOUT 3930 3931 void os::win32::setmode_streams() { 3932 _setmode(_fileno(stdin), _O_BINARY); 3933 _setmode(_fileno(stdout), _O_BINARY); 3934 _setmode(_fileno(stderr), _O_BINARY); 3935 } 3936 3937 3938 bool os::is_debugger_attached() { 3939 return IsDebuggerPresent() ? true : false; 3940 } 3941 3942 3943 void os::wait_for_keypress_at_exit(void) { 3944 if (PauseAtExit) { 3945 fprintf(stderr, "Press any key to continue...\n"); 3946 fgetc(stdin); 3947 } 3948 } 3949 3950 3951 int os::message_box(const char* title, const char* message) { 3952 int result = MessageBox(NULL, message, title, 3953 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 3954 return result == IDYES; 3955 } 3956 3957 int os::allocate_thread_local_storage() { 3958 return TlsAlloc(); 3959 } 3960 3961 3962 void os::free_thread_local_storage(int index) { 3963 TlsFree(index); 3964 } 3965 3966 3967 void os::thread_local_storage_at_put(int index, void* value) { 3968 TlsSetValue(index, value); 3969 assert(thread_local_storage_at(index) == value, "Just checking"); 3970 } 3971 3972 3973 void* os::thread_local_storage_at(int index) { 3974 return TlsGetValue(index); 3975 } 3976 3977 3978 #ifndef PRODUCT 3979 #ifndef _WIN64 3980 // Helpers to check whether NX protection is enabled 3981 int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 3982 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 3983 pex->ExceptionRecord->NumberParameters > 0 && 3984 pex->ExceptionRecord->ExceptionInformation[0] == 3985 EXCEPTION_INFO_EXEC_VIOLATION) { 3986 return EXCEPTION_EXECUTE_HANDLER; 3987 } 3988 return EXCEPTION_CONTINUE_SEARCH; 3989 } 3990 3991 void nx_check_protection() { 3992 // If NX is enabled we'll get an exception calling into code on the stack 3993 char code[] = { (char)0xC3 }; // ret 3994 void *code_ptr = (void *)code; 3995 __try { 3996 __asm call code_ptr 3997 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 3998 tty->print_raw_cr("NX protection detected."); 3999 } 4000 } 4001 #endif // _WIN64 4002 #endif // PRODUCT 4003 4004 // this is called _before_ the global arguments have been parsed 4005 void os::init(void) { 4006 _initial_pid = _getpid(); 4007 4008 init_random(1234567); 4009 4010 win32::initialize_system_info(); 4011 win32::setmode_streams(); 4012 init_page_sizes((size_t) win32::vm_page_size()); 4013 4014 // This may be overridden later when argument processing is done. 4015 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, 4016 os::win32::is_windows_2003()); 4017 4018 // Initialize main_process and main_thread 4019 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 4020 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 4021 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 4022 fatal("DuplicateHandle failed\n"); 4023 } 4024 main_thread_id = (int) GetCurrentThreadId(); 4025 } 4026 4027 // To install functions for atexit processing 4028 extern "C" { 4029 static void perfMemory_exit_helper() { 4030 perfMemory_exit(); 4031 } 4032 } 4033 4034 static jint initSock(); 4035 4036 // this is called _after_ the global arguments have been parsed 4037 jint os::init_2(void) { 4038 // Allocate a single page and mark it as readable for safepoint polling 4039 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 4040 guarantee(polling_page != NULL, "Reserve Failed for polling page"); 4041 4042 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 4043 guarantee(return_page != NULL, "Commit Failed for polling page"); 4044 4045 os::set_polling_page(polling_page); 4046 4047 #ifndef PRODUCT 4048 if (Verbose && PrintMiscellaneous) { 4049 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", 4050 (intptr_t)polling_page); 4051 } 4052 #endif 4053 4054 if (!UseMembar) { 4055 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE); 4056 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 4057 4058 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE); 4059 guarantee(return_page != NULL, "Commit Failed for memory serialize page"); 4060 4061 os::set_memory_serialize_page(mem_serialize_page); 4062 4063 #ifndef PRODUCT 4064 if (Verbose && PrintMiscellaneous) { 4065 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", 4066 (intptr_t)mem_serialize_page); 4067 } 4068 #endif 4069 } 4070 4071 // Setup Windows Exceptions 4072 4073 // for debugging float code generation bugs 4074 if (ForceFloatExceptions) { 4075 #ifndef _WIN64 4076 static long fp_control_word = 0; 4077 __asm { fstcw fp_control_word } 4078 // see Intel PPro Manual, Vol. 2, p 7-16 4079 const long precision = 0x20; 4080 const long underflow = 0x10; 4081 const long overflow = 0x08; 4082 const long zero_div = 0x04; 4083 const long denorm = 0x02; 4084 const long invalid = 0x01; 4085 fp_control_word |= invalid; 4086 __asm { fldcw fp_control_word } 4087 #endif 4088 } 4089 4090 // If stack_commit_size is 0, windows will reserve the default size, 4091 // but only commit a small portion of it. 4092 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 4093 size_t default_reserve_size = os::win32::default_stack_size(); 4094 size_t actual_reserve_size = stack_commit_size; 4095 if (stack_commit_size < default_reserve_size) { 4096 // If stack_commit_size == 0, we want this too 4097 actual_reserve_size = default_reserve_size; 4098 } 4099 4100 // Check minimum allowable stack size for thread creation and to initialize 4101 // the java system classes, including StackOverflowError - depends on page 4102 // size. Add a page for compiler2 recursion in main thread. 4103 // Add in 2*BytesPerWord times page size to account for VM stack during 4104 // class initialization depending on 32 or 64 bit VM. 4105 size_t min_stack_allowed = 4106 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 4107 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size(); 4108 if (actual_reserve_size < min_stack_allowed) { 4109 tty->print_cr("\nThe stack size specified is too small, " 4110 "Specify at least %dk", 4111 min_stack_allowed / K); 4112 return JNI_ERR; 4113 } 4114 4115 JavaThread::set_stack_size_at_create(stack_commit_size); 4116 4117 // Calculate theoretical max. size of Threads to guard gainst artifical 4118 // out-of-memory situations, where all available address-space has been 4119 // reserved by thread stacks. 4120 assert(actual_reserve_size != 0, "Must have a stack"); 4121 4122 // Calculate the thread limit when we should start doing Virtual Memory 4123 // banging. Currently when the threads will have used all but 200Mb of space. 4124 // 4125 // TODO: consider performing a similar calculation for commit size instead 4126 // as reserve size, since on a 64-bit platform we'll run into that more 4127 // often than running out of virtual memory space. We can use the 4128 // lower value of the two calculations as the os_thread_limit. 4129 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 4130 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 4131 4132 // at exit methods are called in the reverse order of their registration. 4133 // there is no limit to the number of functions registered. atexit does 4134 // not set errno. 4135 4136 if (PerfAllowAtExitRegistration) { 4137 // only register atexit functions if PerfAllowAtExitRegistration is set. 4138 // atexit functions can be delayed until process exit time, which 4139 // can be problematic for embedded VM situations. Embedded VMs should 4140 // call DestroyJavaVM() to assure that VM resources are released. 4141 4142 // note: perfMemory_exit_helper atexit function may be removed in 4143 // the future if the appropriate cleanup code can be added to the 4144 // VM_Exit VMOperation's doit method. 4145 if (atexit(perfMemory_exit_helper) != 0) { 4146 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 4147 } 4148 } 4149 4150 #ifndef _WIN64 4151 // Print something if NX is enabled (win32 on AMD64) 4152 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 4153 #endif 4154 4155 // initialize thread priority policy 4156 prio_init(); 4157 4158 if (UseNUMA && !ForceNUMA) { 4159 UseNUMA = false; // We don't fully support this yet 4160 } 4161 4162 if (UseNUMAInterleaving) { 4163 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag 4164 bool success = numa_interleaving_init(); 4165 if (!success) UseNUMAInterleaving = false; 4166 } 4167 4168 if (initSock() != JNI_OK) { 4169 return JNI_ERR; 4170 } 4171 4172 return JNI_OK; 4173 } 4174 4175 // Mark the polling page as unreadable 4176 void os::make_polling_page_unreadable(void) { 4177 DWORD old_status; 4178 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4179 PAGE_NOACCESS, &old_status)) { 4180 fatal("Could not disable polling page"); 4181 } 4182 } 4183 4184 // Mark the polling page as readable 4185 void os::make_polling_page_readable(void) { 4186 DWORD old_status; 4187 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4188 PAGE_READONLY, &old_status)) { 4189 fatal("Could not enable polling page"); 4190 } 4191 } 4192 4193 4194 int os::stat(const char *path, struct stat *sbuf) { 4195 char pathbuf[MAX_PATH]; 4196 if (strlen(path) > MAX_PATH - 1) { 4197 errno = ENAMETOOLONG; 4198 return -1; 4199 } 4200 os::native_path(strcpy(pathbuf, path)); 4201 int ret = ::stat(pathbuf, sbuf); 4202 if (sbuf != NULL && UseUTCFileTimestamp) { 4203 // Fix for 6539723. st_mtime returned from stat() is dependent on 4204 // the system timezone and so can return different values for the 4205 // same file if/when daylight savings time changes. This adjustment 4206 // makes sure the same timestamp is returned regardless of the TZ. 4207 // 4208 // See: 4209 // http://msdn.microsoft.com/library/ 4210 // default.asp?url=/library/en-us/sysinfo/base/ 4211 // time_zone_information_str.asp 4212 // and 4213 // http://msdn.microsoft.com/library/default.asp?url= 4214 // /library/en-us/sysinfo/base/settimezoneinformation.asp 4215 // 4216 // NOTE: there is a insidious bug here: If the timezone is changed 4217 // after the call to stat() but before 'GetTimeZoneInformation()', then 4218 // the adjustment we do here will be wrong and we'll return the wrong 4219 // value (which will likely end up creating an invalid class data 4220 // archive). Absent a better API for this, or some time zone locking 4221 // mechanism, we'll have to live with this risk. 4222 TIME_ZONE_INFORMATION tz; 4223 DWORD tzid = GetTimeZoneInformation(&tz); 4224 int daylightBias = 4225 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 4226 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 4227 } 4228 return ret; 4229 } 4230 4231 4232 #define FT2INT64(ft) \ 4233 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 4234 4235 4236 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4237 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4238 // of a thread. 4239 // 4240 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4241 // the fast estimate available on the platform. 4242 4243 // current_thread_cpu_time() is not optimized for Windows yet 4244 jlong os::current_thread_cpu_time() { 4245 // return user + sys since the cost is the same 4246 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 4247 } 4248 4249 jlong os::thread_cpu_time(Thread* thread) { 4250 // consistent with what current_thread_cpu_time() returns. 4251 return os::thread_cpu_time(thread, true /* user+sys */); 4252 } 4253 4254 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4255 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4256 } 4257 4258 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 4259 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 4260 // If this function changes, os::is_thread_cpu_time_supported() should too 4261 if (os::win32::is_nt()) { 4262 FILETIME CreationTime; 4263 FILETIME ExitTime; 4264 FILETIME KernelTime; 4265 FILETIME UserTime; 4266 4267 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime, 4268 &ExitTime, &KernelTime, &UserTime) == 0) { 4269 return -1; 4270 } else if (user_sys_cpu_time) { 4271 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 4272 } else { 4273 return FT2INT64(UserTime) * 100; 4274 } 4275 } else { 4276 return (jlong) timeGetTime() * 1000000; 4277 } 4278 } 4279 4280 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4281 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4282 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4283 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4284 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4285 } 4286 4287 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4288 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4289 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4290 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4291 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4292 } 4293 4294 bool os::is_thread_cpu_time_supported() { 4295 // see os::thread_cpu_time 4296 if (os::win32::is_nt()) { 4297 FILETIME CreationTime; 4298 FILETIME ExitTime; 4299 FILETIME KernelTime; 4300 FILETIME UserTime; 4301 4302 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime, 4303 &KernelTime, &UserTime) == 0) { 4304 return false; 4305 } else { 4306 return true; 4307 } 4308 } else { 4309 return false; 4310 } 4311 } 4312 4313 // Windows does't provide a loadavg primitive so this is stubbed out for now. 4314 // It does have primitives (PDH API) to get CPU usage and run queue length. 4315 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 4316 // If we wanted to implement loadavg on Windows, we have a few options: 4317 // 4318 // a) Query CPU usage and run queue length and "fake" an answer by 4319 // returning the CPU usage if it's under 100%, and the run queue 4320 // length otherwise. It turns out that querying is pretty slow 4321 // on Windows, on the order of 200 microseconds on a fast machine. 4322 // Note that on the Windows the CPU usage value is the % usage 4323 // since the last time the API was called (and the first call 4324 // returns 100%), so we'd have to deal with that as well. 4325 // 4326 // b) Sample the "fake" answer using a sampling thread and store 4327 // the answer in a global variable. The call to loadavg would 4328 // just return the value of the global, avoiding the slow query. 4329 // 4330 // c) Sample a better answer using exponential decay to smooth the 4331 // value. This is basically the algorithm used by UNIX kernels. 4332 // 4333 // Note that sampling thread starvation could affect both (b) and (c). 4334 int os::loadavg(double loadavg[], int nelem) { 4335 return -1; 4336 } 4337 4338 4339 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 4340 bool os::dont_yield() { 4341 return DontYieldALot; 4342 } 4343 4344 // This method is a slightly reworked copy of JDK's sysOpen 4345 // from src/windows/hpi/src/sys_api_md.c 4346 4347 int os::open(const char *path, int oflag, int mode) { 4348 char pathbuf[MAX_PATH]; 4349 4350 if (strlen(path) > MAX_PATH - 1) { 4351 errno = ENAMETOOLONG; 4352 return -1; 4353 } 4354 os::native_path(strcpy(pathbuf, path)); 4355 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 4356 } 4357 4358 FILE* os::open(int fd, const char* mode) { 4359 return ::_fdopen(fd, mode); 4360 } 4361 4362 // Is a (classpath) directory empty? 4363 bool os::dir_is_empty(const char* path) { 4364 WIN32_FIND_DATA fd; 4365 HANDLE f = FindFirstFile(path, &fd); 4366 if (f == INVALID_HANDLE_VALUE) { 4367 return true; 4368 } 4369 FindClose(f); 4370 return false; 4371 } 4372 4373 // create binary file, rewriting existing file if required 4374 int os::create_binary_file(const char* path, bool rewrite_existing) { 4375 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 4376 if (!rewrite_existing) { 4377 oflags |= _O_EXCL; 4378 } 4379 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 4380 } 4381 4382 // return current position of file pointer 4383 jlong os::current_file_offset(int fd) { 4384 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 4385 } 4386 4387 // move file pointer to the specified offset 4388 jlong os::seek_to_file_offset(int fd, jlong offset) { 4389 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 4390 } 4391 4392 4393 jlong os::lseek(int fd, jlong offset, int whence) { 4394 return (jlong) ::_lseeki64(fd, offset, whence); 4395 } 4396 4397 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 4398 OVERLAPPED ov; 4399 DWORD nread; 4400 BOOL result; 4401 4402 ZeroMemory(&ov, sizeof(ov)); 4403 ov.Offset = (DWORD)offset; 4404 ov.OffsetHigh = (DWORD)(offset >> 32); 4405 4406 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4407 4408 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov); 4409 4410 return result ? nread : 0; 4411 } 4412 4413 4414 // This method is a slightly reworked copy of JDK's sysNativePath 4415 // from src/windows/hpi/src/path_md.c 4416 4417 // Convert a pathname to native format. On win32, this involves forcing all 4418 // separators to be '\\' rather than '/' (both are legal inputs, but Win95 4419 // sometimes rejects '/') and removing redundant separators. The input path is 4420 // assumed to have been converted into the character encoding used by the local 4421 // system. Because this might be a double-byte encoding, care is taken to 4422 // treat double-byte lead characters correctly. 4423 // 4424 // This procedure modifies the given path in place, as the result is never 4425 // longer than the original. There is no error return; this operation always 4426 // succeeds. 4427 char * os::native_path(char *path) { 4428 char *src = path, *dst = path, *end = path; 4429 char *colon = NULL; // If a drive specifier is found, this will 4430 // point to the colon following the drive letter 4431 4432 // Assumption: '/', '\\', ':', and drive letters are never lead bytes 4433 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\')) 4434 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte"); 4435 4436 // Check for leading separators 4437 #define isfilesep(c) ((c) == '/' || (c) == '\\') 4438 while (isfilesep(*src)) { 4439 src++; 4440 } 4441 4442 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 4443 // Remove leading separators if followed by drive specifier. This 4444 // hack is necessary to support file URLs containing drive 4445 // specifiers (e.g., "file://c:/path"). As a side effect, 4446 // "/c:/path" can be used as an alternative to "c:/path". 4447 *dst++ = *src++; 4448 colon = dst; 4449 *dst++ = ':'; 4450 src++; 4451 } else { 4452 src = path; 4453 if (isfilesep(src[0]) && isfilesep(src[1])) { 4454 // UNC pathname: Retain first separator; leave src pointed at 4455 // second separator so that further separators will be collapsed 4456 // into the second separator. The result will be a pathname 4457 // beginning with "\\\\" followed (most likely) by a host name. 4458 src = dst = path + 1; 4459 path[0] = '\\'; // Force first separator to '\\' 4460 } 4461 } 4462 4463 end = dst; 4464 4465 // Remove redundant separators from remainder of path, forcing all 4466 // separators to be '\\' rather than '/'. Also, single byte space 4467 // characters are removed from the end of the path because those 4468 // are not legal ending characters on this operating system. 4469 // 4470 while (*src != '\0') { 4471 if (isfilesep(*src)) { 4472 *dst++ = '\\'; src++; 4473 while (isfilesep(*src)) src++; 4474 if (*src == '\0') { 4475 // Check for trailing separator 4476 end = dst; 4477 if (colon == dst - 2) break; // "z:\\" 4478 if (dst == path + 1) break; // "\\" 4479 if (dst == path + 2 && isfilesep(path[0])) { 4480 // "\\\\" is not collapsed to "\\" because "\\\\" marks the 4481 // beginning of a UNC pathname. Even though it is not, by 4482 // itself, a valid UNC pathname, we leave it as is in order 4483 // to be consistent with the path canonicalizer as well 4484 // as the win32 APIs, which treat this case as an invalid 4485 // UNC pathname rather than as an alias for the root 4486 // directory of the current drive. 4487 break; 4488 } 4489 end = --dst; // Path does not denote a root directory, so 4490 // remove trailing separator 4491 break; 4492 } 4493 end = dst; 4494 } else { 4495 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character 4496 *dst++ = *src++; 4497 if (*src) *dst++ = *src++; 4498 end = dst; 4499 } else { // Copy a single-byte character 4500 char c = *src++; 4501 *dst++ = c; 4502 // Space is not a legal ending character 4503 if (c != ' ') end = dst; 4504 } 4505 } 4506 } 4507 4508 *end = '\0'; 4509 4510 // For "z:", add "." to work around a bug in the C runtime library 4511 if (colon == dst - 1) { 4512 path[2] = '.'; 4513 path[3] = '\0'; 4514 } 4515 4516 return path; 4517 } 4518 4519 // This code is a copy of JDK's sysSetLength 4520 // from src/windows/hpi/src/sys_api_md.c 4521 4522 int os::ftruncate(int fd, jlong length) { 4523 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4524 long high = (long)(length >> 32); 4525 DWORD ret; 4526 4527 if (h == (HANDLE)(-1)) { 4528 return -1; 4529 } 4530 4531 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 4532 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 4533 return -1; 4534 } 4535 4536 if (::SetEndOfFile(h) == FALSE) { 4537 return -1; 4538 } 4539 4540 return 0; 4541 } 4542 4543 4544 // This code is a copy of JDK's sysSync 4545 // from src/windows/hpi/src/sys_api_md.c 4546 // except for the legacy workaround for a bug in Win 98 4547 4548 int os::fsync(int fd) { 4549 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 4550 4551 if ((!::FlushFileBuffers(handle)) && 4552 (GetLastError() != ERROR_ACCESS_DENIED)) { 4553 // from winerror.h 4554 return -1; 4555 } 4556 return 0; 4557 } 4558 4559 static int nonSeekAvailable(int, long *); 4560 static int stdinAvailable(int, long *); 4561 4562 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR) 4563 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO) 4564 4565 // This code is a copy of JDK's sysAvailable 4566 // from src/windows/hpi/src/sys_api_md.c 4567 4568 int os::available(int fd, jlong *bytes) { 4569 jlong cur, end; 4570 struct _stati64 stbuf64; 4571 4572 if (::_fstati64(fd, &stbuf64) >= 0) { 4573 int mode = stbuf64.st_mode; 4574 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 4575 int ret; 4576 long lpbytes; 4577 if (fd == 0) { 4578 ret = stdinAvailable(fd, &lpbytes); 4579 } else { 4580 ret = nonSeekAvailable(fd, &lpbytes); 4581 } 4582 (*bytes) = (jlong)(lpbytes); 4583 return ret; 4584 } 4585 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 4586 return FALSE; 4587 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 4588 return FALSE; 4589 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 4590 return FALSE; 4591 } 4592 *bytes = end - cur; 4593 return TRUE; 4594 } else { 4595 return FALSE; 4596 } 4597 } 4598 4599 // This code is a copy of JDK's nonSeekAvailable 4600 // from src/windows/hpi/src/sys_api_md.c 4601 4602 static int nonSeekAvailable(int fd, long *pbytes) { 4603 // This is used for available on non-seekable devices 4604 // (like both named and anonymous pipes, such as pipes 4605 // connected to an exec'd process). 4606 // Standard Input is a special case. 4607 HANDLE han; 4608 4609 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 4610 return FALSE; 4611 } 4612 4613 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 4614 // PeekNamedPipe fails when at EOF. In that case we 4615 // simply make *pbytes = 0 which is consistent with the 4616 // behavior we get on Solaris when an fd is at EOF. 4617 // The only alternative is to raise an Exception, 4618 // which isn't really warranted. 4619 // 4620 if (::GetLastError() != ERROR_BROKEN_PIPE) { 4621 return FALSE; 4622 } 4623 *pbytes = 0; 4624 } 4625 return TRUE; 4626 } 4627 4628 #define MAX_INPUT_EVENTS 2000 4629 4630 // This code is a copy of JDK's stdinAvailable 4631 // from src/windows/hpi/src/sys_api_md.c 4632 4633 static int stdinAvailable(int fd, long *pbytes) { 4634 HANDLE han; 4635 DWORD numEventsRead = 0; // Number of events read from buffer 4636 DWORD numEvents = 0; // Number of events in buffer 4637 DWORD i = 0; // Loop index 4638 DWORD curLength = 0; // Position marker 4639 DWORD actualLength = 0; // Number of bytes readable 4640 BOOL error = FALSE; // Error holder 4641 INPUT_RECORD *lpBuffer; // Pointer to records of input events 4642 4643 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4644 return FALSE; 4645 } 4646 4647 // Construct an array of input records in the console buffer 4648 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4649 if (error == 0) { 4650 return nonSeekAvailable(fd, pbytes); 4651 } 4652 4653 // lpBuffer must fit into 64K or else PeekConsoleInput fails 4654 if (numEvents > MAX_INPUT_EVENTS) { 4655 numEvents = MAX_INPUT_EVENTS; 4656 } 4657 4658 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal); 4659 if (lpBuffer == NULL) { 4660 return FALSE; 4661 } 4662 4663 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4664 if (error == 0) { 4665 os::free(lpBuffer); 4666 return FALSE; 4667 } 4668 4669 // Examine input records for the number of bytes available 4670 for (i=0; i<numEvents; i++) { 4671 if (lpBuffer[i].EventType == KEY_EVENT) { 4672 4673 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4674 &(lpBuffer[i].Event); 4675 if (keyRecord->bKeyDown == TRUE) { 4676 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4677 curLength++; 4678 if (*keyPressed == '\r') { 4679 actualLength = curLength; 4680 } 4681 } 4682 } 4683 } 4684 4685 if (lpBuffer != NULL) { 4686 os::free(lpBuffer); 4687 } 4688 4689 *pbytes = (long) actualLength; 4690 return TRUE; 4691 } 4692 4693 // Map a block of memory. 4694 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4695 char *addr, size_t bytes, bool read_only, 4696 bool allow_exec) { 4697 HANDLE hFile; 4698 char* base; 4699 4700 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4701 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4702 if (hFile == NULL) { 4703 if (PrintMiscellaneous && Verbose) { 4704 DWORD err = GetLastError(); 4705 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err); 4706 } 4707 return NULL; 4708 } 4709 4710 if (allow_exec) { 4711 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4712 // unless it comes from a PE image (which the shared archive is not.) 4713 // Even VirtualProtect refuses to give execute access to mapped memory 4714 // that was not previously executable. 4715 // 4716 // Instead, stick the executable region in anonymous memory. Yuck. 4717 // Penalty is that ~4 pages will not be shareable - in the future 4718 // we might consider DLLizing the shared archive with a proper PE 4719 // header so that mapping executable + sharing is possible. 4720 4721 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4722 PAGE_READWRITE); 4723 if (base == NULL) { 4724 if (PrintMiscellaneous && Verbose) { 4725 DWORD err = GetLastError(); 4726 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 4727 } 4728 CloseHandle(hFile); 4729 return NULL; 4730 } 4731 4732 DWORD bytes_read; 4733 OVERLAPPED overlapped; 4734 overlapped.Offset = (DWORD)file_offset; 4735 overlapped.OffsetHigh = 0; 4736 overlapped.hEvent = NULL; 4737 // ReadFile guarantees that if the return value is true, the requested 4738 // number of bytes were read before returning. 4739 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 4740 if (!res) { 4741 if (PrintMiscellaneous && Verbose) { 4742 DWORD err = GetLastError(); 4743 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 4744 } 4745 release_memory(base, bytes); 4746 CloseHandle(hFile); 4747 return NULL; 4748 } 4749 } else { 4750 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 4751 NULL /* file_name */); 4752 if (hMap == NULL) { 4753 if (PrintMiscellaneous && Verbose) { 4754 DWORD err = GetLastError(); 4755 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err); 4756 } 4757 CloseHandle(hFile); 4758 return NULL; 4759 } 4760 4761 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 4762 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 4763 (DWORD)bytes, addr); 4764 if (base == NULL) { 4765 if (PrintMiscellaneous && Verbose) { 4766 DWORD err = GetLastError(); 4767 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 4768 } 4769 CloseHandle(hMap); 4770 CloseHandle(hFile); 4771 return NULL; 4772 } 4773 4774 if (CloseHandle(hMap) == 0) { 4775 if (PrintMiscellaneous && Verbose) { 4776 DWORD err = GetLastError(); 4777 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 4778 } 4779 CloseHandle(hFile); 4780 return base; 4781 } 4782 } 4783 4784 if (allow_exec) { 4785 DWORD old_protect; 4786 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 4787 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 4788 4789 if (!res) { 4790 if (PrintMiscellaneous && Verbose) { 4791 DWORD err = GetLastError(); 4792 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 4793 } 4794 // Don't consider this a hard error, on IA32 even if the 4795 // VirtualProtect fails, we should still be able to execute 4796 CloseHandle(hFile); 4797 return base; 4798 } 4799 } 4800 4801 if (CloseHandle(hFile) == 0) { 4802 if (PrintMiscellaneous && Verbose) { 4803 DWORD err = GetLastError(); 4804 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 4805 } 4806 return base; 4807 } 4808 4809 return base; 4810 } 4811 4812 4813 // Remap a block of memory. 4814 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4815 char *addr, size_t bytes, bool read_only, 4816 bool allow_exec) { 4817 // This OS does not allow existing memory maps to be remapped so we 4818 // have to unmap the memory before we remap it. 4819 if (!os::unmap_memory(addr, bytes)) { 4820 return NULL; 4821 } 4822 4823 // There is a very small theoretical window between the unmap_memory() 4824 // call above and the map_memory() call below where a thread in native 4825 // code may be able to access an address that is no longer mapped. 4826 4827 return os::map_memory(fd, file_name, file_offset, addr, bytes, 4828 read_only, allow_exec); 4829 } 4830 4831 4832 // Unmap a block of memory. 4833 // Returns true=success, otherwise false. 4834 4835 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4836 BOOL result = UnmapViewOfFile(addr); 4837 if (result == 0) { 4838 if (PrintMiscellaneous && Verbose) { 4839 DWORD err = GetLastError(); 4840 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 4841 } 4842 return false; 4843 } 4844 return true; 4845 } 4846 4847 void os::pause() { 4848 char filename[MAX_PATH]; 4849 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4850 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4851 } else { 4852 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4853 } 4854 4855 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4856 if (fd != -1) { 4857 struct stat buf; 4858 ::close(fd); 4859 while (::stat(filename, &buf) == 0) { 4860 Sleep(100); 4861 } 4862 } else { 4863 jio_fprintf(stderr, 4864 "Could not open pause file '%s', continuing immediately.\n", filename); 4865 } 4866 } 4867 4868 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 4869 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 4870 } 4871 4872 // See the caveats for this class in os_windows.hpp 4873 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back 4874 // into this method and returns false. If no OS EXCEPTION was raised, returns 4875 // true. 4876 // The callback is supposed to provide the method that should be protected. 4877 // 4878 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 4879 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); 4880 assert(!WatcherThread::watcher_thread()->has_crash_protection(), 4881 "crash_protection already set?"); 4882 4883 bool success = true; 4884 __try { 4885 WatcherThread::watcher_thread()->set_crash_protection(this); 4886 cb.call(); 4887 } __except(EXCEPTION_EXECUTE_HANDLER) { 4888 // only for protection, nothing to do 4889 success = false; 4890 } 4891 WatcherThread::watcher_thread()->set_crash_protection(NULL); 4892 return success; 4893 } 4894 4895 // An Event wraps a win32 "CreateEvent" kernel handle. 4896 // 4897 // We have a number of choices regarding "CreateEvent" win32 handle leakage: 4898 // 4899 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 4900 // field, and call CloseHandle() on the win32 event handle. Unpark() would 4901 // need to be modified to tolerate finding a NULL (invalid) win32 event handle. 4902 // In addition, an unpark() operation might fetch the handle field, but the 4903 // event could recycle between the fetch and the SetEvent() operation. 4904 // SetEvent() would either fail because the handle was invalid, or inadvertently work, 4905 // as the win32 handle value had been recycled. In an ideal world calling SetEvent() 4906 // on an stale but recycled handle would be harmless, but in practice this might 4907 // confuse other non-Sun code, so it's not a viable approach. 4908 // 4909 // 2: Once a win32 event handle is associated with an Event, it remains associated 4910 // with the Event. The event handle is never closed. This could be construed 4911 // as handle leakage, but only up to the maximum # of threads that have been extant 4912 // at any one time. This shouldn't be an issue, as windows platforms typically 4913 // permit a process to have hundreds of thousands of open handles. 4914 // 4915 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 4916 // and release unused handles. 4917 // 4918 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 4919 // It's not clear, however, that we wouldn't be trading one type of leak for another. 4920 // 4921 // 5. Use an RCU-like mechanism (Read-Copy Update). 4922 // Or perhaps something similar to Maged Michael's "Hazard pointers". 4923 // 4924 // We use (2). 4925 // 4926 // TODO-FIXME: 4927 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 4928 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 4929 // to recover from (or at least detect) the dreaded Windows 841176 bug. 4930 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 4931 // into a single win32 CreateEvent() handle. 4932 // 4933 // Assumption: 4934 // Only one parker can exist on an event, which is why we allocate 4935 // them per-thread. Multiple unparkers can coexist. 4936 // 4937 // _Event transitions in park() 4938 // -1 => -1 : illegal 4939 // 1 => 0 : pass - return immediately 4940 // 0 => -1 : block; then set _Event to 0 before returning 4941 // 4942 // _Event transitions in unpark() 4943 // 0 => 1 : just return 4944 // 1 => 1 : just return 4945 // -1 => either 0 or 1; must signal target thread 4946 // That is, we can safely transition _Event from -1 to either 4947 // 0 or 1. 4948 // 4949 // _Event serves as a restricted-range semaphore. 4950 // -1 : thread is blocked, i.e. there is a waiter 4951 // 0 : neutral: thread is running or ready, 4952 // could have been signaled after a wait started 4953 // 1 : signaled - thread is running or ready 4954 // 4955 // Another possible encoding of _Event would be with 4956 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 4957 // 4958 4959 int os::PlatformEvent::park(jlong Millis) { 4960 // Transitions for _Event: 4961 // -1 => -1 : illegal 4962 // 1 => 0 : pass - return immediately 4963 // 0 => -1 : block; then set _Event to 0 before returning 4964 4965 guarantee(_ParkHandle != NULL , "Invariant"); 4966 guarantee(Millis > 0 , "Invariant"); 4967 4968 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 4969 // the initial park() operation. 4970 // Consider: use atomic decrement instead of CAS-loop 4971 4972 int v; 4973 for (;;) { 4974 v = _Event; 4975 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4976 } 4977 guarantee((v == 0) || (v == 1), "invariant"); 4978 if (v != 0) return OS_OK; 4979 4980 // Do this the hard way by blocking ... 4981 // TODO: consider a brief spin here, gated on the success of recent 4982 // spin attempts by this thread. 4983 // 4984 // We decompose long timeouts into series of shorter timed waits. 4985 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 4986 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 4987 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 4988 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 4989 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 4990 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 4991 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 4992 // for the already waited time. This policy does not admit any new outcomes. 4993 // In the future, however, we might want to track the accumulated wait time and 4994 // adjust Millis accordingly if we encounter a spurious wakeup. 4995 4996 const int MAXTIMEOUT = 0x10000000; 4997 DWORD rv = WAIT_TIMEOUT; 4998 while (_Event < 0 && Millis > 0) { 4999 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT) 5000 if (Millis > MAXTIMEOUT) { 5001 prd = MAXTIMEOUT; 5002 } 5003 rv = ::WaitForSingleObject(_ParkHandle, prd); 5004 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed"); 5005 if (rv == WAIT_TIMEOUT) { 5006 Millis -= prd; 5007 } 5008 } 5009 v = _Event; 5010 _Event = 0; 5011 // see comment at end of os::PlatformEvent::park() below: 5012 OrderAccess::fence(); 5013 // If we encounter a nearly simultanous timeout expiry and unpark() 5014 // we return OS_OK indicating we awoke via unpark(). 5015 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 5016 return (v >= 0) ? OS_OK : OS_TIMEOUT; 5017 } 5018 5019 void os::PlatformEvent::park() { 5020 // Transitions for _Event: 5021 // -1 => -1 : illegal 5022 // 1 => 0 : pass - return immediately 5023 // 0 => -1 : block; then set _Event to 0 before returning 5024 5025 guarantee(_ParkHandle != NULL, "Invariant"); 5026 // Invariant: Only the thread associated with the Event/PlatformEvent 5027 // may call park(). 5028 // Consider: use atomic decrement instead of CAS-loop 5029 int v; 5030 for (;;) { 5031 v = _Event; 5032 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5033 } 5034 guarantee((v == 0) || (v == 1), "invariant"); 5035 if (v != 0) return; 5036 5037 // Do this the hard way by blocking ... 5038 // TODO: consider a brief spin here, gated on the success of recent 5039 // spin attempts by this thread. 5040 while (_Event < 0) { 5041 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE); 5042 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed"); 5043 } 5044 5045 // Usually we'll find _Event == 0 at this point, but as 5046 // an optional optimization we clear it, just in case can 5047 // multiple unpark() operations drove _Event up to 1. 5048 _Event = 0; 5049 OrderAccess::fence(); 5050 guarantee(_Event >= 0, "invariant"); 5051 } 5052 5053 void os::PlatformEvent::unpark() { 5054 guarantee(_ParkHandle != NULL, "Invariant"); 5055 5056 // Transitions for _Event: 5057 // 0 => 1 : just return 5058 // 1 => 1 : just return 5059 // -1 => either 0 or 1; must signal target thread 5060 // That is, we can safely transition _Event from -1 to either 5061 // 0 or 1. 5062 // See also: "Semaphores in Plan 9" by Mullender & Cox 5063 // 5064 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5065 // that it will take two back-to-back park() calls for the owning 5066 // thread to block. This has the benefit of forcing a spurious return 5067 // from the first park() call after an unpark() call which will help 5068 // shake out uses of park() and unpark() without condition variables. 5069 5070 if (Atomic::xchg(1, &_Event) >= 0) return; 5071 5072 ::SetEvent(_ParkHandle); 5073 } 5074 5075 5076 // JSR166 5077 // ------------------------------------------------------- 5078 5079 // The Windows implementation of Park is very straightforward: Basic 5080 // operations on Win32 Events turn out to have the right semantics to 5081 // use them directly. We opportunistically resuse the event inherited 5082 // from Monitor. 5083 5084 void Parker::park(bool isAbsolute, jlong time) { 5085 guarantee(_ParkEvent != NULL, "invariant"); 5086 // First, demultiplex/decode time arguments 5087 if (time < 0) { // don't wait 5088 return; 5089 } else if (time == 0 && !isAbsolute) { 5090 time = INFINITE; 5091 } else if (isAbsolute) { 5092 time -= os::javaTimeMillis(); // convert to relative time 5093 if (time <= 0) { // already elapsed 5094 return; 5095 } 5096 } else { // relative 5097 time /= 1000000; // Must coarsen from nanos to millis 5098 if (time == 0) { // Wait for the minimal time unit if zero 5099 time = 1; 5100 } 5101 } 5102 5103 JavaThread* thread = (JavaThread*)(Thread::current()); 5104 assert(thread->is_Java_thread(), "Must be JavaThread"); 5105 JavaThread *jt = (JavaThread *)thread; 5106 5107 // Don't wait if interrupted or already triggered 5108 if (Thread::is_interrupted(thread, false) || 5109 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 5110 ResetEvent(_ParkEvent); 5111 return; 5112 } else { 5113 ThreadBlockInVM tbivm(jt); 5114 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5115 jt->set_suspend_equivalent(); 5116 5117 WaitForSingleObject(_ParkEvent, time); 5118 ResetEvent(_ParkEvent); 5119 5120 // If externally suspended while waiting, re-suspend 5121 if (jt->handle_special_suspend_equivalent_condition()) { 5122 jt->java_suspend_self(); 5123 } 5124 } 5125 } 5126 5127 void Parker::unpark() { 5128 guarantee(_ParkEvent != NULL, "invariant"); 5129 SetEvent(_ParkEvent); 5130 } 5131 5132 // Run the specified command in a separate process. Return its exit value, 5133 // or -1 on failure (e.g. can't create a new process). 5134 int os::fork_and_exec(char* cmd) { 5135 STARTUPINFO si; 5136 PROCESS_INFORMATION pi; 5137 5138 memset(&si, 0, sizeof(si)); 5139 si.cb = sizeof(si); 5140 memset(&pi, 0, sizeof(pi)); 5141 BOOL rslt = CreateProcess(NULL, // executable name - use command line 5142 cmd, // command line 5143 NULL, // process security attribute 5144 NULL, // thread security attribute 5145 TRUE, // inherits system handles 5146 0, // no creation flags 5147 NULL, // use parent's environment block 5148 NULL, // use parent's starting directory 5149 &si, // (in) startup information 5150 &pi); // (out) process information 5151 5152 if (rslt) { 5153 // Wait until child process exits. 5154 WaitForSingleObject(pi.hProcess, INFINITE); 5155 5156 DWORD exit_code; 5157 GetExitCodeProcess(pi.hProcess, &exit_code); 5158 5159 // Close process and thread handles. 5160 CloseHandle(pi.hProcess); 5161 CloseHandle(pi.hThread); 5162 5163 return (int)exit_code; 5164 } else { 5165 return -1; 5166 } 5167 } 5168 5169 //-------------------------------------------------------------------------------------------------- 5170 // Non-product code 5171 5172 static int mallocDebugIntervalCounter = 0; 5173 static int mallocDebugCounter = 0; 5174 bool os::check_heap(bool force) { 5175 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 5176 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 5177 // Note: HeapValidate executes two hardware breakpoints when it finds something 5178 // wrong; at these points, eax contains the address of the offending block (I think). 5179 // To get to the exlicit error message(s) below, just continue twice. 5180 HANDLE heap = GetProcessHeap(); 5181 5182 // If we fail to lock the heap, then gflags.exe has been used 5183 // or some other special heap flag has been set that prevents 5184 // locking. We don't try to walk a heap we can't lock. 5185 if (HeapLock(heap) != 0) { 5186 PROCESS_HEAP_ENTRY phe; 5187 phe.lpData = NULL; 5188 while (HeapWalk(heap, &phe) != 0) { 5189 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 5190 !HeapValidate(heap, 0, phe.lpData)) { 5191 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 5192 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 5193 fatal("corrupted C heap"); 5194 } 5195 } 5196 DWORD err = GetLastError(); 5197 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 5198 fatal(err_msg("heap walk aborted with error %d", err)); 5199 } 5200 HeapUnlock(heap); 5201 } 5202 mallocDebugIntervalCounter = 0; 5203 } 5204 return true; 5205 } 5206 5207 5208 bool os::find(address addr, outputStream* st) { 5209 // Nothing yet 5210 return false; 5211 } 5212 5213 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 5214 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 5215 5216 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 5217 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow(); 5218 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 5219 address addr = (address) exceptionRecord->ExceptionInformation[1]; 5220 5221 if (os::is_memory_serialize_page(thread, addr)) { 5222 return EXCEPTION_CONTINUE_EXECUTION; 5223 } 5224 } 5225 5226 return EXCEPTION_CONTINUE_SEARCH; 5227 } 5228 5229 // We don't build a headless jre for Windows 5230 bool os::is_headless_jre() { return false; } 5231 5232 static jint initSock() { 5233 WSADATA wsadata; 5234 5235 if (!os::WinSock2Dll::WinSock2Available()) { 5236 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n", 5237 ::GetLastError()); 5238 return JNI_ERR; 5239 } 5240 5241 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) { 5242 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n", 5243 ::GetLastError()); 5244 return JNI_ERR; 5245 } 5246 return JNI_OK; 5247 } 5248 5249 struct hostent* os::get_host_by_name(char* name) { 5250 return (struct hostent*)os::WinSock2Dll::gethostbyname(name); 5251 } 5252 5253 int os::socket_close(int fd) { 5254 return ::closesocket(fd); 5255 } 5256 5257 int os::socket(int domain, int type, int protocol) { 5258 return ::socket(domain, type, protocol); 5259 } 5260 5261 int os::connect(int fd, struct sockaddr* him, socklen_t len) { 5262 return ::connect(fd, him, len); 5263 } 5264 5265 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5266 return ::recv(fd, buf, (int)nBytes, flags); 5267 } 5268 5269 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5270 return ::send(fd, buf, (int)nBytes, flags); 5271 } 5272 5273 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5274 return ::send(fd, buf, (int)nBytes, flags); 5275 } 5276 5277 // WINDOWS CONTEXT Flags for THREAD_SAMPLING 5278 #if defined(IA32) 5279 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS) 5280 #elif defined (AMD64) 5281 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT) 5282 #endif 5283 5284 // returns true if thread could be suspended, 5285 // false otherwise 5286 static bool do_suspend(HANDLE* h) { 5287 if (h != NULL) { 5288 if (SuspendThread(*h) != ~0) { 5289 return true; 5290 } 5291 } 5292 return false; 5293 } 5294 5295 // resume the thread 5296 // calling resume on an active thread is a no-op 5297 static void do_resume(HANDLE* h) { 5298 if (h != NULL) { 5299 ResumeThread(*h); 5300 } 5301 } 5302 5303 // retrieve a suspend/resume context capable handle 5304 // from the tid. Caller validates handle return value. 5305 void get_thread_handle_for_extended_context(HANDLE* h, 5306 OSThread::thread_id_t tid) { 5307 if (h != NULL) { 5308 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid); 5309 } 5310 } 5311 5312 // Thread sampling implementation 5313 // 5314 void os::SuspendedThreadTask::internal_do_task() { 5315 CONTEXT ctxt; 5316 HANDLE h = NULL; 5317 5318 // get context capable handle for thread 5319 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id()); 5320 5321 // sanity 5322 if (h == NULL || h == INVALID_HANDLE_VALUE) { 5323 return; 5324 } 5325 5326 // suspend the thread 5327 if (do_suspend(&h)) { 5328 ctxt.ContextFlags = sampling_context_flags; 5329 // get thread context 5330 GetThreadContext(h, &ctxt); 5331 SuspendedThreadTaskContext context(_thread, &ctxt); 5332 // pass context to Thread Sampling impl 5333 do_task(context); 5334 // resume thread 5335 do_resume(&h); 5336 } 5337 5338 // close handle 5339 CloseHandle(h); 5340 } 5341 5342 5343 // Kernel32 API 5344 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void); 5345 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD); 5346 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG); 5347 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG); 5348 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG); 5349 5350 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL; 5351 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL; 5352 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL; 5353 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL; 5354 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL; 5355 5356 5357 BOOL os::Kernel32Dll::initialized = FALSE; 5358 SIZE_T os::Kernel32Dll::GetLargePageMinimum() { 5359 assert(initialized && _GetLargePageMinimum != NULL, 5360 "GetLargePageMinimumAvailable() not yet called"); 5361 return _GetLargePageMinimum(); 5362 } 5363 5364 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() { 5365 if (!initialized) { 5366 initialize(); 5367 } 5368 return _GetLargePageMinimum != NULL; 5369 } 5370 5371 BOOL os::Kernel32Dll::NumaCallsAvailable() { 5372 if (!initialized) { 5373 initialize(); 5374 } 5375 return _VirtualAllocExNuma != NULL; 5376 } 5377 5378 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, 5379 SIZE_T bytes, DWORD flags, 5380 DWORD prot, DWORD node) { 5381 assert(initialized && _VirtualAllocExNuma != NULL, 5382 "NUMACallsAvailable() not yet called"); 5383 5384 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node); 5385 } 5386 5387 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) { 5388 assert(initialized && _GetNumaHighestNodeNumber != NULL, 5389 "NUMACallsAvailable() not yet called"); 5390 5391 return _GetNumaHighestNodeNumber(ptr_highest_node_number); 5392 } 5393 5394 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, 5395 PULONGLONG proc_mask) { 5396 assert(initialized && _GetNumaNodeProcessorMask != NULL, 5397 "NUMACallsAvailable() not yet called"); 5398 5399 return _GetNumaNodeProcessorMask(node, proc_mask); 5400 } 5401 5402 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip, 5403 ULONG FrameToCapture, 5404 PVOID* BackTrace, 5405 PULONG BackTraceHash) { 5406 if (!initialized) { 5407 initialize(); 5408 } 5409 5410 if (_RtlCaptureStackBackTrace != NULL) { 5411 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture, 5412 BackTrace, BackTraceHash); 5413 } else { 5414 return 0; 5415 } 5416 } 5417 5418 void os::Kernel32Dll::initializeCommon() { 5419 if (!initialized) { 5420 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5421 assert(handle != NULL, "Just check"); 5422 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum"); 5423 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma"); 5424 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber"); 5425 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask"); 5426 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace"); 5427 initialized = TRUE; 5428 } 5429 } 5430 5431 5432 5433 #ifndef JDK6_OR_EARLIER 5434 5435 void os::Kernel32Dll::initialize() { 5436 initializeCommon(); 5437 } 5438 5439 5440 // Kernel32 API 5441 inline BOOL os::Kernel32Dll::SwitchToThread() { 5442 return ::SwitchToThread(); 5443 } 5444 5445 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5446 return true; 5447 } 5448 5449 // Help tools 5450 inline BOOL os::Kernel32Dll::HelpToolsAvailable() { 5451 return true; 5452 } 5453 5454 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5455 DWORD th32ProcessId) { 5456 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5457 } 5458 5459 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot, 5460 LPMODULEENTRY32 lpme) { 5461 return ::Module32First(hSnapshot, lpme); 5462 } 5463 5464 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5465 LPMODULEENTRY32 lpme) { 5466 return ::Module32Next(hSnapshot, lpme); 5467 } 5468 5469 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5470 ::GetNativeSystemInfo(lpSystemInfo); 5471 } 5472 5473 // PSAPI API 5474 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, 5475 HMODULE *lpModule, DWORD cb, 5476 LPDWORD lpcbNeeded) { 5477 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5478 } 5479 5480 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, 5481 HMODULE hModule, 5482 LPTSTR lpFilename, 5483 DWORD nSize) { 5484 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5485 } 5486 5487 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, 5488 HMODULE hModule, 5489 LPMODULEINFO lpmodinfo, 5490 DWORD cb) { 5491 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5492 } 5493 5494 inline BOOL os::PSApiDll::PSApiAvailable() { 5495 return true; 5496 } 5497 5498 5499 // WinSock2 API 5500 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, 5501 LPWSADATA lpWSAData) { 5502 return ::WSAStartup(wVersionRequested, lpWSAData); 5503 } 5504 5505 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5506 return ::gethostbyname(name); 5507 } 5508 5509 inline BOOL os::WinSock2Dll::WinSock2Available() { 5510 return true; 5511 } 5512 5513 // Advapi API 5514 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5515 BOOL DisableAllPrivileges, 5516 PTOKEN_PRIVILEGES NewState, 5517 DWORD BufferLength, 5518 PTOKEN_PRIVILEGES PreviousState, 5519 PDWORD ReturnLength) { 5520 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5521 BufferLength, PreviousState, ReturnLength); 5522 } 5523 5524 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5525 DWORD DesiredAccess, 5526 PHANDLE TokenHandle) { 5527 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5528 } 5529 5530 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5531 LPCTSTR lpName, 5532 PLUID lpLuid) { 5533 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5534 } 5535 5536 inline BOOL os::Advapi32Dll::AdvapiAvailable() { 5537 return true; 5538 } 5539 5540 void* os::get_default_process_handle() { 5541 return (void*)GetModuleHandle(NULL); 5542 } 5543 5544 // Builds a platform dependent Agent_OnLoad_<lib_name> function name 5545 // which is used to find statically linked in agents. 5546 // Additionally for windows, takes into account __stdcall names. 5547 // Parameters: 5548 // sym_name: Symbol in library we are looking for 5549 // lib_name: Name of library to look in, NULL for shared libs. 5550 // is_absolute_path == true if lib_name is absolute path to agent 5551 // such as "C:/a/b/L.dll" 5552 // == false if only the base name of the library is passed in 5553 // such as "L" 5554 char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 5555 bool is_absolute_path) { 5556 char *agent_entry_name; 5557 size_t len; 5558 size_t name_len; 5559 size_t prefix_len = strlen(JNI_LIB_PREFIX); 5560 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 5561 const char *start; 5562 5563 if (lib_name != NULL) { 5564 len = name_len = strlen(lib_name); 5565 if (is_absolute_path) { 5566 // Need to strip path, prefix and suffix 5567 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 5568 lib_name = ++start; 5569 } else { 5570 // Need to check for drive prefix 5571 if ((start = strchr(lib_name, ':')) != NULL) { 5572 lib_name = ++start; 5573 } 5574 } 5575 if (len <= (prefix_len + suffix_len)) { 5576 return NULL; 5577 } 5578 lib_name += prefix_len; 5579 name_len = strlen(lib_name) - suffix_len; 5580 } 5581 } 5582 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 5583 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 5584 if (agent_entry_name == NULL) { 5585 return NULL; 5586 } 5587 if (lib_name != NULL) { 5588 const char *p = strrchr(sym_name, '@'); 5589 if (p != NULL && p != sym_name) { 5590 // sym_name == _Agent_OnLoad@XX 5591 strncpy(agent_entry_name, sym_name, (p - sym_name)); 5592 agent_entry_name[(p-sym_name)] = '\0'; 5593 // agent_entry_name == _Agent_OnLoad 5594 strcat(agent_entry_name, "_"); 5595 strncat(agent_entry_name, lib_name, name_len); 5596 strcat(agent_entry_name, p); 5597 // agent_entry_name == _Agent_OnLoad_lib_name@XX 5598 } else { 5599 strcpy(agent_entry_name, sym_name); 5600 strcat(agent_entry_name, "_"); 5601 strncat(agent_entry_name, lib_name, name_len); 5602 } 5603 } else { 5604 strcpy(agent_entry_name, sym_name); 5605 } 5606 return agent_entry_name; 5607 } 5608 5609 #else 5610 // Kernel32 API 5611 typedef BOOL (WINAPI* SwitchToThread_Fn)(void); 5612 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD); 5613 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32); 5614 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32); 5615 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO); 5616 5617 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL; 5618 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL; 5619 Module32First_Fn os::Kernel32Dll::_Module32First = NULL; 5620 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL; 5621 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL; 5622 5623 void os::Kernel32Dll::initialize() { 5624 if (!initialized) { 5625 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5626 assert(handle != NULL, "Just check"); 5627 5628 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread"); 5629 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn) 5630 ::GetProcAddress(handle, "CreateToolhelp32Snapshot"); 5631 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First"); 5632 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next"); 5633 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo"); 5634 initializeCommon(); // resolve the functions that always need resolving 5635 5636 initialized = TRUE; 5637 } 5638 } 5639 5640 BOOL os::Kernel32Dll::SwitchToThread() { 5641 assert(initialized && _SwitchToThread != NULL, 5642 "SwitchToThreadAvailable() not yet called"); 5643 return _SwitchToThread(); 5644 } 5645 5646 5647 BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5648 if (!initialized) { 5649 initialize(); 5650 } 5651 return _SwitchToThread != NULL; 5652 } 5653 5654 // Help tools 5655 BOOL os::Kernel32Dll::HelpToolsAvailable() { 5656 if (!initialized) { 5657 initialize(); 5658 } 5659 return _CreateToolhelp32Snapshot != NULL && 5660 _Module32First != NULL && 5661 _Module32Next != NULL; 5662 } 5663 5664 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5665 DWORD th32ProcessId) { 5666 assert(initialized && _CreateToolhelp32Snapshot != NULL, 5667 "HelpToolsAvailable() not yet called"); 5668 5669 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5670 } 5671 5672 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5673 assert(initialized && _Module32First != NULL, 5674 "HelpToolsAvailable() not yet called"); 5675 5676 return _Module32First(hSnapshot, lpme); 5677 } 5678 5679 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5680 LPMODULEENTRY32 lpme) { 5681 assert(initialized && _Module32Next != NULL, 5682 "HelpToolsAvailable() not yet called"); 5683 5684 return _Module32Next(hSnapshot, lpme); 5685 } 5686 5687 5688 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() { 5689 if (!initialized) { 5690 initialize(); 5691 } 5692 return _GetNativeSystemInfo != NULL; 5693 } 5694 5695 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5696 assert(initialized && _GetNativeSystemInfo != NULL, 5697 "GetNativeSystemInfoAvailable() not yet called"); 5698 5699 _GetNativeSystemInfo(lpSystemInfo); 5700 } 5701 5702 // PSAPI API 5703 5704 5705 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD); 5706 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD); 5707 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD); 5708 5709 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL; 5710 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL; 5711 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL; 5712 BOOL os::PSApiDll::initialized = FALSE; 5713 5714 void os::PSApiDll::initialize() { 5715 if (!initialized) { 5716 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0); 5717 if (handle != NULL) { 5718 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle, 5719 "EnumProcessModules"); 5720 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle, 5721 "GetModuleFileNameExA"); 5722 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle, 5723 "GetModuleInformation"); 5724 } 5725 initialized = TRUE; 5726 } 5727 } 5728 5729 5730 5731 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, 5732 DWORD cb, LPDWORD lpcbNeeded) { 5733 assert(initialized && _EnumProcessModules != NULL, 5734 "PSApiAvailable() not yet called"); 5735 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5736 } 5737 5738 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, 5739 LPTSTR lpFilename, DWORD nSize) { 5740 assert(initialized && _GetModuleFileNameEx != NULL, 5741 "PSApiAvailable() not yet called"); 5742 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5743 } 5744 5745 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, 5746 LPMODULEINFO lpmodinfo, DWORD cb) { 5747 assert(initialized && _GetModuleInformation != NULL, 5748 "PSApiAvailable() not yet called"); 5749 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5750 } 5751 5752 BOOL os::PSApiDll::PSApiAvailable() { 5753 if (!initialized) { 5754 initialize(); 5755 } 5756 return _EnumProcessModules != NULL && 5757 _GetModuleFileNameEx != NULL && 5758 _GetModuleInformation != NULL; 5759 } 5760 5761 5762 // WinSock2 API 5763 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA); 5764 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...); 5765 5766 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL; 5767 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL; 5768 BOOL os::WinSock2Dll::initialized = FALSE; 5769 5770 void os::WinSock2Dll::initialize() { 5771 if (!initialized) { 5772 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0); 5773 if (handle != NULL) { 5774 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup"); 5775 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname"); 5776 } 5777 initialized = TRUE; 5778 } 5779 } 5780 5781 5782 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) { 5783 assert(initialized && _WSAStartup != NULL, 5784 "WinSock2Available() not yet called"); 5785 return _WSAStartup(wVersionRequested, lpWSAData); 5786 } 5787 5788 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5789 assert(initialized && _gethostbyname != NULL, 5790 "WinSock2Available() not yet called"); 5791 return _gethostbyname(name); 5792 } 5793 5794 BOOL os::WinSock2Dll::WinSock2Available() { 5795 if (!initialized) { 5796 initialize(); 5797 } 5798 return _WSAStartup != NULL && 5799 _gethostbyname != NULL; 5800 } 5801 5802 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 5803 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE); 5804 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID); 5805 5806 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL; 5807 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL; 5808 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL; 5809 BOOL os::Advapi32Dll::initialized = FALSE; 5810 5811 void os::Advapi32Dll::initialize() { 5812 if (!initialized) { 5813 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0); 5814 if (handle != NULL) { 5815 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle, 5816 "AdjustTokenPrivileges"); 5817 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle, 5818 "OpenProcessToken"); 5819 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle, 5820 "LookupPrivilegeValueA"); 5821 } 5822 initialized = TRUE; 5823 } 5824 } 5825 5826 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5827 BOOL DisableAllPrivileges, 5828 PTOKEN_PRIVILEGES NewState, 5829 DWORD BufferLength, 5830 PTOKEN_PRIVILEGES PreviousState, 5831 PDWORD ReturnLength) { 5832 assert(initialized && _AdjustTokenPrivileges != NULL, 5833 "AdvapiAvailable() not yet called"); 5834 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5835 BufferLength, PreviousState, ReturnLength); 5836 } 5837 5838 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5839 DWORD DesiredAccess, 5840 PHANDLE TokenHandle) { 5841 assert(initialized && _OpenProcessToken != NULL, 5842 "AdvapiAvailable() not yet called"); 5843 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5844 } 5845 5846 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5847 LPCTSTR lpName, PLUID lpLuid) { 5848 assert(initialized && _LookupPrivilegeValue != NULL, 5849 "AdvapiAvailable() not yet called"); 5850 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5851 } 5852 5853 BOOL os::Advapi32Dll::AdvapiAvailable() { 5854 if (!initialized) { 5855 initialize(); 5856 } 5857 return _AdjustTokenPrivileges != NULL && 5858 _OpenProcessToken != NULL && 5859 _LookupPrivilegeValue != NULL; 5860 } 5861 5862 #endif 5863 5864 #ifndef PRODUCT 5865 5866 // test the code path in reserve_memory_special() that tries to allocate memory in a single 5867 // contiguous memory block at a particular address. 5868 // The test first tries to find a good approximate address to allocate at by using the same 5869 // method to allocate some memory at any address. The test then tries to allocate memory in 5870 // the vicinity (not directly after it to avoid possible by-chance use of that location) 5871 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of 5872 // the previously allocated memory is available for allocation. The only actual failure 5873 // that is reported is when the test tries to allocate at a particular location but gets a 5874 // different valid one. A NULL return value at this point is not considered an error but may 5875 // be legitimate. 5876 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages. 5877 void TestReserveMemorySpecial_test() { 5878 if (!UseLargePages) { 5879 if (VerboseInternalVMTests) { 5880 gclog_or_tty->print("Skipping test because large pages are disabled"); 5881 } 5882 return; 5883 } 5884 // save current value of globals 5885 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; 5886 bool old_use_numa_interleaving = UseNUMAInterleaving; 5887 5888 // set globals to make sure we hit the correct code path 5889 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; 5890 5891 // do an allocation at an address selected by the OS to get a good one. 5892 const size_t large_allocation_size = os::large_page_size() * 4; 5893 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); 5894 if (result == NULL) { 5895 if (VerboseInternalVMTests) { 5896 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.", 5897 large_allocation_size); 5898 } 5899 } else { 5900 os::release_memory_special(result, large_allocation_size); 5901 5902 // allocate another page within the recently allocated memory area which seems to be a good location. At least 5903 // we managed to get it once. 5904 const size_t expected_allocation_size = os::large_page_size(); 5905 char* expected_location = result + os::large_page_size(); 5906 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); 5907 if (actual_location == NULL) { 5908 if (VerboseInternalVMTests) { 5909 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.", 5910 expected_location, large_allocation_size); 5911 } 5912 } else { 5913 // release memory 5914 os::release_memory_special(actual_location, expected_allocation_size); 5915 // only now check, after releasing any memory to avoid any leaks. 5916 assert(actual_location == expected_location, 5917 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead", 5918 expected_location, expected_allocation_size, actual_location)); 5919 } 5920 } 5921 5922 // restore globals 5923 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; 5924 UseNUMAInterleaving = old_use_numa_interleaving; 5925 } 5926 #endif // PRODUCT 5927