1 /* 2 * Copyright (c) 1997, 2016, 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 "logging/log.hpp" 39 #include "memory/allocation.inline.hpp" 40 #include "memory/filemap.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.hpp" 49 #include "runtime/extendedPC.hpp" 50 #include "runtime/globals.hpp" 51 #include "runtime/interfaceSupport.hpp" 52 #include "runtime/java.hpp" 53 #include "runtime/javaCalls.hpp" 54 #include "runtime/mutexLocker.hpp" 55 #include "runtime/objectMonitor.hpp" 56 #include "runtime/orderAccess.inline.hpp" 57 #include "runtime/osThread.hpp" 58 #include "runtime/perfMemory.hpp" 59 #include "runtime/sharedRuntime.hpp" 60 #include "runtime/statSampler.hpp" 61 #include "runtime/stubRoutines.hpp" 62 #include "runtime/thread.inline.hpp" 63 #include "runtime/threadCritical.hpp" 64 #include "runtime/timer.hpp" 65 #include "runtime/vm_version.hpp" 66 #include "semaphore_windows.hpp" 67 #include "services/attachListener.hpp" 68 #include "services/memTracker.hpp" 69 #include "services/runtimeService.hpp" 70 #include "utilities/decoder.hpp" 71 #include "utilities/defaultStream.hpp" 72 #include "utilities/events.hpp" 73 #include "utilities/growableArray.hpp" 74 #include "utilities/macros.hpp" 75 #include "utilities/vmError.hpp" 76 77 #ifdef _DEBUG 78 #include <crtdbg.h> 79 #endif 80 81 82 #include <windows.h> 83 #include <sys/types.h> 84 #include <sys/stat.h> 85 #include <sys/timeb.h> 86 #include <objidl.h> 87 #include <shlobj.h> 88 89 #include <malloc.h> 90 #include <signal.h> 91 #include <direct.h> 92 #include <errno.h> 93 #include <fcntl.h> 94 #include <io.h> 95 #include <process.h> // For _beginthreadex(), _endthreadex() 96 #include <imagehlp.h> // For os::dll_address_to_function_name 97 // for enumerating dll libraries 98 #include <vdmdbg.h> 99 100 // for timer info max values which include all bits 101 #define ALL_64_BITS CONST64(-1) 102 103 // For DLL loading/load error detection 104 // Values of PE COFF 105 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c 106 #define IMAGE_FILE_SIGNATURE_LENGTH 4 107 108 static HANDLE main_process; 109 static HANDLE main_thread; 110 static int main_thread_id; 111 112 static FILETIME process_creation_time; 113 static FILETIME process_exit_time; 114 static FILETIME process_user_time; 115 static FILETIME process_kernel_time; 116 117 #ifdef _M_IA64 118 #define __CPU__ ia64 119 #else 120 #ifdef _M_AMD64 121 #define __CPU__ amd64 122 #else 123 #define __CPU__ i486 124 #endif 125 #endif 126 127 // save DLL module handle, used by GetModuleFileName 128 129 HINSTANCE vm_lib_handle; 130 131 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { 132 switch (reason) { 133 case DLL_PROCESS_ATTACH: 134 vm_lib_handle = hinst; 135 if (ForceTimeHighResolution) { 136 timeBeginPeriod(1L); 137 } 138 break; 139 case DLL_PROCESS_DETACH: 140 if (ForceTimeHighResolution) { 141 timeEndPeriod(1L); 142 } 143 break; 144 default: 145 break; 146 } 147 return true; 148 } 149 150 static inline double fileTimeAsDouble(FILETIME* time) { 151 const double high = (double) ((unsigned int) ~0); 152 const double split = 10000000.0; 153 double result = (time->dwLowDateTime / split) + 154 time->dwHighDateTime * (high/split); 155 return result; 156 } 157 158 // Implementation of os 159 160 bool os::unsetenv(const char* name) { 161 assert(name != NULL, "Null pointer"); 162 return (SetEnvironmentVariable(name, NULL) == TRUE); 163 } 164 165 // No setuid programs under Windows. 166 bool os::have_special_privileges() { 167 return false; 168 } 169 170 171 // This method is a periodic task to check for misbehaving JNI applications 172 // under CheckJNI, we can add any periodic checks here. 173 // For Windows at the moment does nothing 174 void os::run_periodic_checks() { 175 return; 176 } 177 178 // previous UnhandledExceptionFilter, if there is one 179 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL; 180 181 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 182 183 void os::init_system_properties_values() { 184 // sysclasspath, java_home, dll_dir 185 { 186 char *home_path; 187 char *dll_path; 188 char *pslash; 189 char *bin = "\\bin"; 190 char home_dir[MAX_PATH + 1]; 191 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR"); 192 193 if (alt_home_dir != NULL) { 194 strncpy(home_dir, alt_home_dir, MAX_PATH + 1); 195 home_dir[MAX_PATH] = '\0'; 196 } else { 197 os::jvm_path(home_dir, sizeof(home_dir)); 198 // Found the full path to jvm.dll. 199 // Now cut the path to <java_home>/jre if we can. 200 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll 201 pslash = strrchr(home_dir, '\\'); 202 if (pslash != NULL) { 203 *pslash = '\0'; // get rid of \{client|server} 204 pslash = strrchr(home_dir, '\\'); 205 if (pslash != NULL) { 206 *pslash = '\0'; // get rid of \bin 207 } 208 } 209 } 210 211 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal); 212 if (home_path == NULL) { 213 return; 214 } 215 strcpy(home_path, home_dir); 216 Arguments::set_java_home(home_path); 217 FREE_C_HEAP_ARRAY(char, home_path); 218 219 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, 220 mtInternal); 221 if (dll_path == NULL) { 222 return; 223 } 224 strcpy(dll_path, home_dir); 225 strcat(dll_path, bin); 226 Arguments::set_dll_dir(dll_path); 227 FREE_C_HEAP_ARRAY(char, dll_path); 228 229 if (!set_boot_path('\\', ';')) { 230 return; 231 } 232 } 233 234 // library_path 235 #define EXT_DIR "\\lib\\ext" 236 #define BIN_DIR "\\bin" 237 #define PACKAGE_DIR "\\Sun\\Java" 238 { 239 // Win32 library search order (See the documentation for LoadLibrary): 240 // 241 // 1. The directory from which application is loaded. 242 // 2. The system wide Java Extensions directory (Java only) 243 // 3. System directory (GetSystemDirectory) 244 // 4. Windows directory (GetWindowsDirectory) 245 // 5. The PATH environment variable 246 // 6. The current directory 247 248 char *library_path; 249 char tmp[MAX_PATH]; 250 char *path_str = ::getenv("PATH"); 251 252 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 253 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal); 254 255 library_path[0] = '\0'; 256 257 GetModuleFileName(NULL, tmp, sizeof(tmp)); 258 *(strrchr(tmp, '\\')) = '\0'; 259 strcat(library_path, tmp); 260 261 GetWindowsDirectory(tmp, sizeof(tmp)); 262 strcat(library_path, ";"); 263 strcat(library_path, tmp); 264 strcat(library_path, PACKAGE_DIR BIN_DIR); 265 266 GetSystemDirectory(tmp, sizeof(tmp)); 267 strcat(library_path, ";"); 268 strcat(library_path, tmp); 269 270 GetWindowsDirectory(tmp, sizeof(tmp)); 271 strcat(library_path, ";"); 272 strcat(library_path, tmp); 273 274 if (path_str) { 275 strcat(library_path, ";"); 276 strcat(library_path, path_str); 277 } 278 279 strcat(library_path, ";."); 280 281 Arguments::set_library_path(library_path); 282 FREE_C_HEAP_ARRAY(char, library_path); 283 } 284 285 // Default extensions directory 286 { 287 char path[MAX_PATH]; 288 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 289 GetWindowsDirectory(path, MAX_PATH); 290 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 291 path, PACKAGE_DIR, EXT_DIR); 292 Arguments::set_ext_dirs(buf); 293 } 294 #undef EXT_DIR 295 #undef BIN_DIR 296 #undef PACKAGE_DIR 297 298 #ifndef _WIN64 299 // set our UnhandledExceptionFilter and save any previous one 300 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception); 301 #endif 302 303 // Done 304 return; 305 } 306 307 void os::breakpoint() { 308 DebugBreak(); 309 } 310 311 // Invoked from the BREAKPOINT Macro 312 extern "C" void breakpoint() { 313 os::breakpoint(); 314 } 315 316 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP. 317 // So far, this method is only used by Native Memory Tracking, which is 318 // only supported on Windows XP or later. 319 // 320 int os::get_native_stack(address* stack, int frames, int toSkip) { 321 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL); 322 for (int index = captured; index < frames; index ++) { 323 stack[index] = NULL; 324 } 325 return captured; 326 } 327 328 329 // os::current_stack_base() 330 // 331 // Returns the base of the stack, which is the stack's 332 // starting address. This function must be called 333 // while running on the stack of the thread being queried. 334 335 address os::current_stack_base() { 336 MEMORY_BASIC_INFORMATION minfo; 337 address stack_bottom; 338 size_t stack_size; 339 340 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 341 stack_bottom = (address)minfo.AllocationBase; 342 stack_size = minfo.RegionSize; 343 344 // Add up the sizes of all the regions with the same 345 // AllocationBase. 346 while (1) { 347 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 348 if (stack_bottom == (address)minfo.AllocationBase) { 349 stack_size += minfo.RegionSize; 350 } else { 351 break; 352 } 353 } 354 355 #ifdef _M_IA64 356 // IA64 has memory and register stacks 357 // 358 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit 359 // at thread creation (1MB backing store growing upwards, 1MB memory stack 360 // growing downwards, 2MB summed up) 361 // 362 // ... 363 // ------- top of stack (high address) ----- 364 // | 365 // | 1MB 366 // | Backing Store (Register Stack) 367 // | 368 // | / \ 369 // | | 370 // | | 371 // | | 372 // ------------------------ stack base ----- 373 // | 1MB 374 // | Memory Stack 375 // | 376 // | | 377 // | | 378 // | | 379 // | \ / 380 // | 381 // ----- bottom of stack (low address) ----- 382 // ... 383 384 stack_size = stack_size / 2; 385 #endif 386 return stack_bottom + stack_size; 387 } 388 389 size_t os::current_stack_size() { 390 size_t sz; 391 MEMORY_BASIC_INFORMATION minfo; 392 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 393 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 394 return sz; 395 } 396 397 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 398 const struct tm* time_struct_ptr = localtime(clock); 399 if (time_struct_ptr != NULL) { 400 *res = *time_struct_ptr; 401 return res; 402 } 403 return NULL; 404 } 405 406 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 407 408 // Thread start routine for all newly created threads 409 static unsigned __stdcall thread_native_entry(Thread* thread) { 410 // Try to randomize the cache line index of hot stack frames. 411 // This helps when threads of the same stack traces evict each other's 412 // cache lines. The threads can be either from the same JVM instance, or 413 // from different JVM instances. The benefit is especially true for 414 // processors with hyperthreading technology. 415 static int counter = 0; 416 int pid = os::current_process_id(); 417 _alloca(((pid ^ counter++) & 7) * 128); 418 419 thread->initialize_thread_current(); 420 421 OSThread* osthr = thread->osthread(); 422 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 423 424 if (UseNUMA) { 425 int lgrp_id = os::numa_get_group_id(); 426 if (lgrp_id != -1) { 427 thread->set_lgrp_id(lgrp_id); 428 } 429 } 430 431 // Diagnostic code to investigate JDK-6573254 432 int res = 30115; // non-java thread 433 if (thread->is_Java_thread()) { 434 res = 20115; // java thread 435 } 436 437 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id()); 438 439 // Install a win32 structured exception handler around every thread created 440 // by VM, so VM can generate error dump when an exception occurred in non- 441 // Java thread (e.g. VM thread). 442 __try { 443 thread->run(); 444 } __except(topLevelExceptionFilter( 445 (_EXCEPTION_POINTERS*)_exception_info())) { 446 // Nothing to do. 447 } 448 449 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); 450 451 // One less thread is executing 452 // When the VMThread gets here, the main thread may have already exited 453 // which frees the CodeHeap containing the Atomic::add code 454 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 455 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); 456 } 457 458 // If a thread has not deleted itself ("delete this") as part of its 459 // termination sequence, we have to ensure thread-local-storage is 460 // cleared before we actually terminate. No threads should ever be 461 // deleted asynchronously with respect to their termination. 462 if (Thread::current_or_null_safe() != NULL) { 463 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 464 thread->clear_thread_current(); 465 } 466 467 // Thread must not return from exit_process_or_thread(), but if it does, 468 // let it proceed to exit normally 469 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res); 470 } 471 472 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, 473 int thread_id) { 474 // Allocate the OSThread object 475 OSThread* osthread = new OSThread(NULL, NULL); 476 if (osthread == NULL) return NULL; 477 478 // Initialize support for Java interrupts 479 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 480 if (interrupt_event == NULL) { 481 delete osthread; 482 return NULL; 483 } 484 osthread->set_interrupt_event(interrupt_event); 485 486 // Store info on the Win32 thread into the OSThread 487 osthread->set_thread_handle(thread_handle); 488 osthread->set_thread_id(thread_id); 489 490 if (UseNUMA) { 491 int lgrp_id = os::numa_get_group_id(); 492 if (lgrp_id != -1) { 493 thread->set_lgrp_id(lgrp_id); 494 } 495 } 496 497 // Initial thread state is INITIALIZED, not SUSPENDED 498 osthread->set_state(INITIALIZED); 499 500 return osthread; 501 } 502 503 504 bool os::create_attached_thread(JavaThread* thread) { 505 #ifdef ASSERT 506 thread->verify_not_published(); 507 #endif 508 HANDLE thread_h; 509 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 510 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 511 fatal("DuplicateHandle failed\n"); 512 } 513 OSThread* osthread = create_os_thread(thread, thread_h, 514 (int)current_thread_id()); 515 if (osthread == NULL) { 516 return false; 517 } 518 519 // Initial thread state is RUNNABLE 520 osthread->set_state(RUNNABLE); 521 522 thread->set_osthread(osthread); 523 524 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", 525 os::current_thread_id()); 526 527 return true; 528 } 529 530 bool os::create_main_thread(JavaThread* thread) { 531 #ifdef ASSERT 532 thread->verify_not_published(); 533 #endif 534 if (_starting_thread == NULL) { 535 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 536 if (_starting_thread == NULL) { 537 return false; 538 } 539 } 540 541 // The primordial thread is runnable from the start) 542 _starting_thread->set_state(RUNNABLE); 543 544 thread->set_osthread(_starting_thread); 545 return true; 546 } 547 548 // Helper function to trace _beginthreadex attributes, 549 // similar to os::Posix::describe_pthread_attr() 550 static char* describe_beginthreadex_attributes(char* buf, size_t buflen, 551 size_t stacksize, unsigned initflag) { 552 stringStream ss(buf, buflen); 553 if (stacksize == 0) { 554 ss.print("stacksize: default, "); 555 } else { 556 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); 557 } 558 ss.print("flags: "); 559 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " "); 560 #define ALL(X) \ 561 X(CREATE_SUSPENDED) \ 562 X(STACK_SIZE_PARAM_IS_A_RESERVATION) 563 ALL(PRINT_FLAG) 564 #undef ALL 565 #undef PRINT_FLAG 566 return buf; 567 } 568 569 // Allocate and initialize a new OSThread 570 bool os::create_thread(Thread* thread, ThreadType thr_type, 571 size_t stack_size) { 572 unsigned thread_id; 573 574 // Allocate the OSThread object 575 OSThread* osthread = new OSThread(NULL, NULL); 576 if (osthread == NULL) { 577 return false; 578 } 579 580 // Initialize support for Java interrupts 581 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 582 if (interrupt_event == NULL) { 583 delete osthread; 584 return NULL; 585 } 586 osthread->set_interrupt_event(interrupt_event); 587 osthread->set_interrupted(false); 588 589 thread->set_osthread(osthread); 590 591 if (stack_size == 0) { 592 switch (thr_type) { 593 case os::java_thread: 594 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 595 if (JavaThread::stack_size_at_create() > 0) { 596 stack_size = JavaThread::stack_size_at_create(); 597 } 598 break; 599 case os::compiler_thread: 600 if (CompilerThreadStackSize > 0) { 601 stack_size = (size_t)(CompilerThreadStackSize * K); 602 break; 603 } // else fall through: 604 // use VMThreadStackSize if CompilerThreadStackSize is not defined 605 case os::vm_thread: 606 case os::pgc_thread: 607 case os::cgc_thread: 608 case os::watcher_thread: 609 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 610 break; 611 } 612 } 613 614 // Create the Win32 thread 615 // 616 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 617 // does not specify stack size. Instead, it specifies the size of 618 // initially committed space. The stack size is determined by 619 // PE header in the executable. If the committed "stack_size" is larger 620 // than default value in the PE header, the stack is rounded up to the 621 // nearest multiple of 1MB. For example if the launcher has default 622 // stack size of 320k, specifying any size less than 320k does not 623 // affect the actual stack size at all, it only affects the initial 624 // commitment. On the other hand, specifying 'stack_size' larger than 625 // default value may cause significant increase in memory usage, because 626 // not only the stack space will be rounded up to MB, but also the 627 // entire space is committed upfront. 628 // 629 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 630 // for CreateThread() that can treat 'stack_size' as stack size. However we 631 // are not supposed to call CreateThread() directly according to MSDN 632 // document because JVM uses C runtime library. The good news is that the 633 // flag appears to work with _beginthredex() as well. 634 635 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION; 636 HANDLE thread_handle = 637 (HANDLE)_beginthreadex(NULL, 638 (unsigned)stack_size, 639 (unsigned (__stdcall *)(void*)) thread_native_entry, 640 thread, 641 initflag, 642 &thread_id); 643 644 char buf[64]; 645 if (thread_handle != NULL) { 646 log_info(os, thread)("Thread started (tid: %u, attributes: %s)", 647 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag)); 648 } else { 649 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.", 650 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag)); 651 } 652 653 if (thread_handle == NULL) { 654 // Need to clean up stuff we've allocated so far 655 CloseHandle(osthread->interrupt_event()); 656 thread->set_osthread(NULL); 657 delete osthread; 658 return NULL; 659 } 660 661 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); 662 663 // Store info on the Win32 thread into the OSThread 664 osthread->set_thread_handle(thread_handle); 665 osthread->set_thread_id(thread_id); 666 667 // Initial thread state is INITIALIZED, not SUSPENDED 668 osthread->set_state(INITIALIZED); 669 670 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 671 return true; 672 } 673 674 675 // Free Win32 resources related to the OSThread 676 void os::free_thread(OSThread* osthread) { 677 assert(osthread != NULL, "osthread not set"); 678 679 // We are told to free resources of the argument thread, 680 // but we can only really operate on the current thread. 681 assert(Thread::current()->osthread() == osthread, 682 "os::free_thread but not current thread"); 683 684 CloseHandle(osthread->thread_handle()); 685 CloseHandle(osthread->interrupt_event()); 686 delete osthread; 687 } 688 689 static jlong first_filetime; 690 static jlong initial_performance_count; 691 static jlong performance_frequency; 692 693 694 jlong as_long(LARGE_INTEGER x) { 695 jlong result = 0; // initialization to avoid warning 696 set_high(&result, x.HighPart); 697 set_low(&result, x.LowPart); 698 return result; 699 } 700 701 702 jlong os::elapsed_counter() { 703 LARGE_INTEGER count; 704 QueryPerformanceCounter(&count); 705 return as_long(count) - initial_performance_count; 706 } 707 708 709 jlong os::elapsed_frequency() { 710 return performance_frequency; 711 } 712 713 714 julong os::available_memory() { 715 return win32::available_memory(); 716 } 717 718 julong os::win32::available_memory() { 719 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 720 // value if total memory is larger than 4GB 721 MEMORYSTATUSEX ms; 722 ms.dwLength = sizeof(ms); 723 GlobalMemoryStatusEx(&ms); 724 725 return (julong)ms.ullAvailPhys; 726 } 727 728 julong os::physical_memory() { 729 return win32::physical_memory(); 730 } 731 732 bool os::has_allocatable_memory_limit(julong* limit) { 733 MEMORYSTATUSEX ms; 734 ms.dwLength = sizeof(ms); 735 GlobalMemoryStatusEx(&ms); 736 #ifdef _LP64 737 *limit = (julong)ms.ullAvailVirtual; 738 return true; 739 #else 740 // Limit to 1400m because of the 2gb address space wall 741 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual); 742 return true; 743 #endif 744 } 745 746 int os::active_processor_count() { 747 DWORD_PTR lpProcessAffinityMask = 0; 748 DWORD_PTR lpSystemAffinityMask = 0; 749 int proc_count = processor_count(); 750 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 751 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 752 // Nof active processors is number of bits in process affinity mask 753 int bitcount = 0; 754 while (lpProcessAffinityMask != 0) { 755 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 756 bitcount++; 757 } 758 return bitcount; 759 } else { 760 return proc_count; 761 } 762 } 763 764 void os::set_native_thread_name(const char *name) { 765 766 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx 767 // 768 // Note that unfortunately this only works if the process 769 // is already attached to a debugger; debugger must observe 770 // the exception below to show the correct name. 771 772 const DWORD MS_VC_EXCEPTION = 0x406D1388; 773 struct { 774 DWORD dwType; // must be 0x1000 775 LPCSTR szName; // pointer to name (in user addr space) 776 DWORD dwThreadID; // thread ID (-1=caller thread) 777 DWORD dwFlags; // reserved for future use, must be zero 778 } info; 779 780 info.dwType = 0x1000; 781 info.szName = name; 782 info.dwThreadID = -1; 783 info.dwFlags = 0; 784 785 __try { 786 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info ); 787 } __except(EXCEPTION_CONTINUE_EXECUTION) {} 788 } 789 790 bool os::distribute_processes(uint length, uint* distribution) { 791 // Not yet implemented. 792 return false; 793 } 794 795 bool os::bind_to_processor(uint processor_id) { 796 // Not yet implemented. 797 return false; 798 } 799 800 void os::win32::initialize_performance_counter() { 801 LARGE_INTEGER count; 802 QueryPerformanceFrequency(&count); 803 performance_frequency = as_long(count); 804 QueryPerformanceCounter(&count); 805 initial_performance_count = as_long(count); 806 } 807 808 809 double os::elapsedTime() { 810 return (double) elapsed_counter() / (double) elapsed_frequency(); 811 } 812 813 814 // Windows format: 815 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 816 // Java format: 817 // Java standards require the number of milliseconds since 1/1/1970 818 819 // Constant offset - calculated using offset() 820 static jlong _offset = 116444736000000000; 821 // Fake time counter for reproducible results when debugging 822 static jlong fake_time = 0; 823 824 #ifdef ASSERT 825 // Just to be safe, recalculate the offset in debug mode 826 static jlong _calculated_offset = 0; 827 static int _has_calculated_offset = 0; 828 829 jlong offset() { 830 if (_has_calculated_offset) return _calculated_offset; 831 SYSTEMTIME java_origin; 832 java_origin.wYear = 1970; 833 java_origin.wMonth = 1; 834 java_origin.wDayOfWeek = 0; // ignored 835 java_origin.wDay = 1; 836 java_origin.wHour = 0; 837 java_origin.wMinute = 0; 838 java_origin.wSecond = 0; 839 java_origin.wMilliseconds = 0; 840 FILETIME jot; 841 if (!SystemTimeToFileTime(&java_origin, &jot)) { 842 fatal("Error = %d\nWindows error", GetLastError()); 843 } 844 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 845 _has_calculated_offset = 1; 846 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 847 return _calculated_offset; 848 } 849 #else 850 jlong offset() { 851 return _offset; 852 } 853 #endif 854 855 jlong windows_to_java_time(FILETIME wt) { 856 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 857 return (a - offset()) / 10000; 858 } 859 860 // Returns time ticks in (10th of micro seconds) 861 jlong windows_to_time_ticks(FILETIME wt) { 862 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 863 return (a - offset()); 864 } 865 866 FILETIME java_to_windows_time(jlong l) { 867 jlong a = (l * 10000) + offset(); 868 FILETIME result; 869 result.dwHighDateTime = high(a); 870 result.dwLowDateTime = low(a); 871 return result; 872 } 873 874 bool os::supports_vtime() { return true; } 875 bool os::enable_vtime() { return false; } 876 bool os::vtime_enabled() { return false; } 877 878 double os::elapsedVTime() { 879 FILETIME created; 880 FILETIME exited; 881 FILETIME kernel; 882 FILETIME user; 883 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) { 884 // the resolution of windows_to_java_time() should be sufficient (ms) 885 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS; 886 } else { 887 return elapsedTime(); 888 } 889 } 890 891 jlong os::javaTimeMillis() { 892 if (UseFakeTimers) { 893 return fake_time++; 894 } else { 895 FILETIME wt; 896 GetSystemTimeAsFileTime(&wt); 897 return windows_to_java_time(wt); 898 } 899 } 900 901 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 902 FILETIME wt; 903 GetSystemTimeAsFileTime(&wt); 904 jlong ticks = windows_to_time_ticks(wt); // 10th of micros 905 jlong secs = jlong(ticks / 10000000); // 10000 * 1000 906 seconds = secs; 907 nanos = jlong(ticks - (secs*10000000)) * 100; 908 } 909 910 jlong os::javaTimeNanos() { 911 LARGE_INTEGER current_count; 912 QueryPerformanceCounter(¤t_count); 913 double current = as_long(current_count); 914 double freq = performance_frequency; 915 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC); 916 return time; 917 } 918 919 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 920 jlong freq = performance_frequency; 921 if (freq < NANOSECS_PER_SEC) { 922 // the performance counter is 64 bits and we will 923 // be multiplying it -- so no wrap in 64 bits 924 info_ptr->max_value = ALL_64_BITS; 925 } else if (freq > NANOSECS_PER_SEC) { 926 // use the max value the counter can reach to 927 // determine the max value which could be returned 928 julong max_counter = (julong)ALL_64_BITS; 929 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC)); 930 } else { 931 // the performance counter is 64 bits and we will 932 // be using it directly -- so no wrap in 64 bits 933 info_ptr->max_value = ALL_64_BITS; 934 } 935 936 // using a counter, so no skipping 937 info_ptr->may_skip_backward = false; 938 info_ptr->may_skip_forward = false; 939 940 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 941 } 942 943 char* os::local_time_string(char *buf, size_t buflen) { 944 SYSTEMTIME st; 945 GetLocalTime(&st); 946 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 947 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 948 return buf; 949 } 950 951 bool os::getTimesSecs(double* process_real_time, 952 double* process_user_time, 953 double* process_system_time) { 954 HANDLE h_process = GetCurrentProcess(); 955 FILETIME create_time, exit_time, kernel_time, user_time; 956 BOOL result = GetProcessTimes(h_process, 957 &create_time, 958 &exit_time, 959 &kernel_time, 960 &user_time); 961 if (result != 0) { 962 FILETIME wt; 963 GetSystemTimeAsFileTime(&wt); 964 jlong rtc_millis = windows_to_java_time(wt); 965 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 966 *process_user_time = 967 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS); 968 *process_system_time = 969 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS); 970 return true; 971 } else { 972 return false; 973 } 974 } 975 976 void os::shutdown() { 977 // allow PerfMemory to attempt cleanup of any persistent resources 978 perfMemory_exit(); 979 980 // flush buffered output, finish log files 981 ostream_abort(); 982 983 // Check for abort hook 984 abort_hook_t abort_hook = Arguments::abort_hook(); 985 if (abort_hook != NULL) { 986 abort_hook(); 987 } 988 } 989 990 991 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 992 PMINIDUMP_EXCEPTION_INFORMATION, 993 PMINIDUMP_USER_STREAM_INFORMATION, 994 PMINIDUMP_CALLBACK_INFORMATION); 995 996 static HANDLE dumpFile = NULL; 997 998 // Check if dump file can be created. 999 void os::check_dump_limit(char* buffer, size_t buffsz) { 1000 bool status = true; 1001 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) { 1002 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line"); 1003 status = false; 1004 } 1005 1006 #ifndef ASSERT 1007 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) { 1008 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows"); 1009 status = false; 1010 } 1011 #endif 1012 1013 if (status) { 1014 const char* cwd = get_current_directory(NULL, 0); 1015 int pid = current_process_id(); 1016 if (cwd != NULL) { 1017 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid); 1018 } else { 1019 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid); 1020 } 1021 1022 if (dumpFile == NULL && 1023 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL)) 1024 == INVALID_HANDLE_VALUE) { 1025 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError()); 1026 status = false; 1027 } 1028 } 1029 VMError::record_coredump_status(buffer, status); 1030 } 1031 1032 void os::abort(bool dump_core, void* siginfo, const void* context) { 1033 HINSTANCE dbghelp; 1034 EXCEPTION_POINTERS ep; 1035 MINIDUMP_EXCEPTION_INFORMATION mei; 1036 MINIDUMP_EXCEPTION_INFORMATION* pmei; 1037 1038 HANDLE hProcess = GetCurrentProcess(); 1039 DWORD processId = GetCurrentProcessId(); 1040 MINIDUMP_TYPE dumpType; 1041 1042 shutdown(); 1043 if (!dump_core || dumpFile == NULL) { 1044 if (dumpFile != NULL) { 1045 CloseHandle(dumpFile); 1046 } 1047 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1048 } 1049 1050 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0); 1051 1052 if (dbghelp == NULL) { 1053 jio_fprintf(stderr, "Failed to load dbghelp.dll\n"); 1054 CloseHandle(dumpFile); 1055 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1056 } 1057 1058 _MiniDumpWriteDump = 1059 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 1060 PMINIDUMP_EXCEPTION_INFORMATION, 1061 PMINIDUMP_USER_STREAM_INFORMATION, 1062 PMINIDUMP_CALLBACK_INFORMATION), 1063 GetProcAddress(dbghelp, 1064 "MiniDumpWriteDump")); 1065 1066 if (_MiniDumpWriteDump == NULL) { 1067 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n"); 1068 CloseHandle(dumpFile); 1069 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1070 } 1071 1072 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData | 1073 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules); 1074 1075 if (siginfo != NULL && context != NULL) { 1076 ep.ContextRecord = (PCONTEXT) context; 1077 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo; 1078 1079 mei.ThreadId = GetCurrentThreadId(); 1080 mei.ExceptionPointers = &ep; 1081 pmei = &mei; 1082 } else { 1083 pmei = NULL; 1084 } 1085 1086 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all 1087 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then. 1088 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false && 1089 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) { 1090 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError()); 1091 } 1092 CloseHandle(dumpFile); 1093 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1094 } 1095 1096 // Die immediately, no exit hook, no abort hook, no cleanup. 1097 void os::die() { 1098 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1); 1099 } 1100 1101 // Directory routines copied from src/win32/native/java/io/dirent_md.c 1102 // * dirent_md.c 1.15 00/02/02 1103 // 1104 // The declarations for DIR and struct dirent are in jvm_win32.h. 1105 1106 // Caller must have already run dirname through JVM_NativePath, which removes 1107 // duplicate slashes and converts all instances of '/' into '\\'. 1108 1109 DIR * os::opendir(const char *dirname) { 1110 assert(dirname != NULL, "just checking"); // hotspot change 1111 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal); 1112 DWORD fattr; // hotspot change 1113 char alt_dirname[4] = { 0, 0, 0, 0 }; 1114 1115 if (dirp == 0) { 1116 errno = ENOMEM; 1117 return 0; 1118 } 1119 1120 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it 1121 // as a directory in FindFirstFile(). We detect this case here and 1122 // prepend the current drive name. 1123 // 1124 if (dirname[1] == '\0' && dirname[0] == '\\') { 1125 alt_dirname[0] = _getdrive() + 'A' - 1; 1126 alt_dirname[1] = ':'; 1127 alt_dirname[2] = '\\'; 1128 alt_dirname[3] = '\0'; 1129 dirname = alt_dirname; 1130 } 1131 1132 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal); 1133 if (dirp->path == 0) { 1134 free(dirp); 1135 errno = ENOMEM; 1136 return 0; 1137 } 1138 strcpy(dirp->path, dirname); 1139 1140 fattr = GetFileAttributes(dirp->path); 1141 if (fattr == 0xffffffff) { 1142 free(dirp->path); 1143 free(dirp); 1144 errno = ENOENT; 1145 return 0; 1146 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 1147 free(dirp->path); 1148 free(dirp); 1149 errno = ENOTDIR; 1150 return 0; 1151 } 1152 1153 // Append "*.*", or possibly "\\*.*", to path 1154 if (dirp->path[1] == ':' && 1155 (dirp->path[2] == '\0' || 1156 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 1157 // No '\\' needed for cases like "Z:" or "Z:\" 1158 strcat(dirp->path, "*.*"); 1159 } else { 1160 strcat(dirp->path, "\\*.*"); 1161 } 1162 1163 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 1164 if (dirp->handle == INVALID_HANDLE_VALUE) { 1165 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 1166 free(dirp->path); 1167 free(dirp); 1168 errno = EACCES; 1169 return 0; 1170 } 1171 } 1172 return dirp; 1173 } 1174 1175 // parameter dbuf unused on Windows 1176 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) { 1177 assert(dirp != NULL, "just checking"); // hotspot change 1178 if (dirp->handle == INVALID_HANDLE_VALUE) { 1179 return 0; 1180 } 1181 1182 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 1183 1184 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 1185 if (GetLastError() == ERROR_INVALID_HANDLE) { 1186 errno = EBADF; 1187 return 0; 1188 } 1189 FindClose(dirp->handle); 1190 dirp->handle = INVALID_HANDLE_VALUE; 1191 } 1192 1193 return &dirp->dirent; 1194 } 1195 1196 int os::closedir(DIR *dirp) { 1197 assert(dirp != NULL, "just checking"); // hotspot change 1198 if (dirp->handle != INVALID_HANDLE_VALUE) { 1199 if (!FindClose(dirp->handle)) { 1200 errno = EBADF; 1201 return -1; 1202 } 1203 dirp->handle = INVALID_HANDLE_VALUE; 1204 } 1205 free(dirp->path); 1206 free(dirp); 1207 return 0; 1208 } 1209 1210 // This must be hard coded because it's the system's temporary 1211 // directory not the java application's temp directory, ala java.io.tmpdir. 1212 const char* os::get_temp_directory() { 1213 static char path_buf[MAX_PATH]; 1214 if (GetTempPath(MAX_PATH, path_buf) > 0) { 1215 return path_buf; 1216 } else { 1217 path_buf[0] = '\0'; 1218 return path_buf; 1219 } 1220 } 1221 1222 static bool file_exists(const char* filename) { 1223 if (filename == NULL || strlen(filename) == 0) { 1224 return false; 1225 } 1226 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES; 1227 } 1228 1229 bool os::dll_build_name(char *buffer, size_t buflen, 1230 const char* pname, const char* fname) { 1231 bool retval = false; 1232 const size_t pnamelen = pname ? strlen(pname) : 0; 1233 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0; 1234 1235 // Return error on buffer overflow. 1236 if (pnamelen + strlen(fname) + 10 > buflen) { 1237 return retval; 1238 } 1239 1240 if (pnamelen == 0) { 1241 jio_snprintf(buffer, buflen, "%s.dll", fname); 1242 retval = true; 1243 } else if (c == ':' || c == '\\') { 1244 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname); 1245 retval = true; 1246 } else if (strchr(pname, *os::path_separator()) != NULL) { 1247 int n; 1248 char** pelements = split_path(pname, &n); 1249 if (pelements == NULL) { 1250 return false; 1251 } 1252 for (int i = 0; i < n; i++) { 1253 char* path = pelements[i]; 1254 // Really shouldn't be NULL, but check can't hurt 1255 size_t plen = (path == NULL) ? 0 : strlen(path); 1256 if (plen == 0) { 1257 continue; // skip the empty path values 1258 } 1259 const char lastchar = path[plen - 1]; 1260 if (lastchar == ':' || lastchar == '\\') { 1261 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname); 1262 } else { 1263 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname); 1264 } 1265 if (file_exists(buffer)) { 1266 retval = true; 1267 break; 1268 } 1269 } 1270 // release the storage 1271 for (int i = 0; i < n; i++) { 1272 if (pelements[i] != NULL) { 1273 FREE_C_HEAP_ARRAY(char, pelements[i]); 1274 } 1275 } 1276 if (pelements != NULL) { 1277 FREE_C_HEAP_ARRAY(char*, pelements); 1278 } 1279 } else { 1280 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname); 1281 retval = true; 1282 } 1283 return retval; 1284 } 1285 1286 // Needs to be in os specific directory because windows requires another 1287 // header file <direct.h> 1288 const char* os::get_current_directory(char *buf, size_t buflen) { 1289 int n = static_cast<int>(buflen); 1290 if (buflen > INT_MAX) n = INT_MAX; 1291 return _getcwd(buf, n); 1292 } 1293 1294 //----------------------------------------------------------- 1295 // Helper functions for fatal error handler 1296 #ifdef _WIN64 1297 // Helper routine which returns true if address in 1298 // within the NTDLL address space. 1299 // 1300 static bool _addr_in_ntdll(address addr) { 1301 HMODULE hmod; 1302 MODULEINFO minfo; 1303 1304 hmod = GetModuleHandle("NTDLL.DLL"); 1305 if (hmod == NULL) return false; 1306 if (!GetModuleInformation(GetCurrentProcess(), hmod, 1307 &minfo, sizeof(MODULEINFO))) { 1308 return false; 1309 } 1310 1311 if ((addr >= minfo.lpBaseOfDll) && 1312 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) { 1313 return true; 1314 } else { 1315 return false; 1316 } 1317 } 1318 #endif 1319 1320 struct _modinfo { 1321 address addr; 1322 char* full_path; // point to a char buffer 1323 int buflen; // size of the buffer 1324 address base_addr; 1325 }; 1326 1327 static int _locate_module_by_addr(const char * mod_fname, address base_addr, 1328 address top_address, void * param) { 1329 struct _modinfo *pmod = (struct _modinfo *)param; 1330 if (!pmod) return -1; 1331 1332 if (base_addr <= pmod->addr && 1333 top_address > pmod->addr) { 1334 // if a buffer is provided, copy path name to the buffer 1335 if (pmod->full_path) { 1336 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1337 } 1338 pmod->base_addr = base_addr; 1339 return 1; 1340 } 1341 return 0; 1342 } 1343 1344 bool os::dll_address_to_library_name(address addr, char* buf, 1345 int buflen, int* offset) { 1346 // buf is not optional, but offset is optional 1347 assert(buf != NULL, "sanity check"); 1348 1349 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1350 // return the full path to the DLL file, sometimes it returns path 1351 // to the corresponding PDB file (debug info); sometimes it only 1352 // returns partial path, which makes life painful. 1353 1354 struct _modinfo mi; 1355 mi.addr = addr; 1356 mi.full_path = buf; 1357 mi.buflen = buflen; 1358 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) { 1359 // buf already contains path name 1360 if (offset) *offset = addr - mi.base_addr; 1361 return true; 1362 } 1363 1364 buf[0] = '\0'; 1365 if (offset) *offset = -1; 1366 return false; 1367 } 1368 1369 bool os::dll_address_to_function_name(address addr, char *buf, 1370 int buflen, int *offset, 1371 bool demangle) { 1372 // buf is not optional, but offset is optional 1373 assert(buf != NULL, "sanity check"); 1374 1375 if (Decoder::decode(addr, buf, buflen, offset, demangle)) { 1376 return true; 1377 } 1378 if (offset != NULL) *offset = -1; 1379 buf[0] = '\0'; 1380 return false; 1381 } 1382 1383 // save the start and end address of jvm.dll into param[0] and param[1] 1384 static int _locate_jvm_dll(const char* mod_fname, address base_addr, 1385 address top_address, void * param) { 1386 if (!param) return -1; 1387 1388 if (base_addr <= (address)_locate_jvm_dll && 1389 top_address > (address)_locate_jvm_dll) { 1390 ((address*)param)[0] = base_addr; 1391 ((address*)param)[1] = top_address; 1392 return 1; 1393 } 1394 return 0; 1395 } 1396 1397 address vm_lib_location[2]; // start and end address of jvm.dll 1398 1399 // check if addr is inside jvm.dll 1400 bool os::address_is_in_vm(address addr) { 1401 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1402 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) { 1403 assert(false, "Can't find jvm module."); 1404 return false; 1405 } 1406 } 1407 1408 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1409 } 1410 1411 // print module info; param is outputStream* 1412 static int _print_module(const char* fname, address base_address, 1413 address top_address, void* param) { 1414 if (!param) return -1; 1415 1416 outputStream* st = (outputStream*)param; 1417 1418 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname); 1419 return 0; 1420 } 1421 1422 // Loads .dll/.so and 1423 // in case of error it checks if .dll/.so was built for the 1424 // same architecture as Hotspot is running on 1425 void * os::dll_load(const char *name, char *ebuf, int ebuflen) { 1426 void * result = LoadLibrary(name); 1427 if (result != NULL) { 1428 return result; 1429 } 1430 1431 DWORD errcode = GetLastError(); 1432 if (errcode == ERROR_MOD_NOT_FOUND) { 1433 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1); 1434 ebuf[ebuflen - 1] = '\0'; 1435 return NULL; 1436 } 1437 1438 // Parsing dll below 1439 // If we can read dll-info and find that dll was built 1440 // for an architecture other than Hotspot is running in 1441 // - then print to buffer "DLL was built for a different architecture" 1442 // else call os::lasterror to obtain system error message 1443 1444 // Read system error message into ebuf 1445 // It may or may not be overwritten below (in the for loop and just above) 1446 lasterror(ebuf, (size_t) ebuflen); 1447 ebuf[ebuflen - 1] = '\0'; 1448 int fd = ::open(name, O_RDONLY | O_BINARY, 0); 1449 if (fd < 0) { 1450 return NULL; 1451 } 1452 1453 uint32_t signature_offset; 1454 uint16_t lib_arch = 0; 1455 bool failed_to_get_lib_arch = 1456 ( // Go to position 3c in the dll 1457 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0) 1458 || 1459 // Read location of signature 1460 (sizeof(signature_offset) != 1461 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset)))) 1462 || 1463 // Go to COFF File Header in dll 1464 // that is located after "signature" (4 bytes long) 1465 (os::seek_to_file_offset(fd, 1466 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0) 1467 || 1468 // Read field that contains code of architecture 1469 // that dll was built for 1470 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch)))) 1471 ); 1472 1473 ::close(fd); 1474 if (failed_to_get_lib_arch) { 1475 // file i/o error - report os::lasterror(...) msg 1476 return NULL; 1477 } 1478 1479 typedef struct { 1480 uint16_t arch_code; 1481 char* arch_name; 1482 } arch_t; 1483 1484 static const arch_t arch_array[] = { 1485 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1486 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1487 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1488 }; 1489 #if (defined _M_IA64) 1490 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64; 1491 #elif (defined _M_AMD64) 1492 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64; 1493 #elif (defined _M_IX86) 1494 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386; 1495 #else 1496 #error Method os::dll_load requires that one of following \ 1497 is defined :_M_IA64,_M_AMD64 or _M_IX86 1498 #endif 1499 1500 1501 // Obtain a string for printf operation 1502 // lib_arch_str shall contain string what platform this .dll was built for 1503 // running_arch_str shall string contain what platform Hotspot was built for 1504 char *running_arch_str = NULL, *lib_arch_str = NULL; 1505 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) { 1506 if (lib_arch == arch_array[i].arch_code) { 1507 lib_arch_str = arch_array[i].arch_name; 1508 } 1509 if (running_arch == arch_array[i].arch_code) { 1510 running_arch_str = arch_array[i].arch_name; 1511 } 1512 } 1513 1514 assert(running_arch_str, 1515 "Didn't find running architecture code in arch_array"); 1516 1517 // If the architecture is right 1518 // but some other error took place - report os::lasterror(...) msg 1519 if (lib_arch == running_arch) { 1520 return NULL; 1521 } 1522 1523 if (lib_arch_str != NULL) { 1524 ::_snprintf(ebuf, ebuflen - 1, 1525 "Can't load %s-bit .dll on a %s-bit platform", 1526 lib_arch_str, running_arch_str); 1527 } else { 1528 // don't know what architecture this dll was build for 1529 ::_snprintf(ebuf, ebuflen - 1, 1530 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1531 lib_arch, running_arch_str); 1532 } 1533 1534 return NULL; 1535 } 1536 1537 void os::print_dll_info(outputStream *st) { 1538 st->print_cr("Dynamic libraries:"); 1539 get_loaded_modules_info(_print_module, (void *)st); 1540 } 1541 1542 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1543 HANDLE hProcess; 1544 1545 # define MAX_NUM_MODULES 128 1546 HMODULE modules[MAX_NUM_MODULES]; 1547 static char filename[MAX_PATH]; 1548 int result = 0; 1549 1550 int pid = os::current_process_id(); 1551 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1552 FALSE, pid); 1553 if (hProcess == NULL) return 0; 1554 1555 DWORD size_needed; 1556 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) { 1557 CloseHandle(hProcess); 1558 return 0; 1559 } 1560 1561 // number of modules that are currently loaded 1562 int num_modules = size_needed / sizeof(HMODULE); 1563 1564 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1565 // Get Full pathname: 1566 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) { 1567 filename[0] = '\0'; 1568 } 1569 1570 MODULEINFO modinfo; 1571 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) { 1572 modinfo.lpBaseOfDll = NULL; 1573 modinfo.SizeOfImage = 0; 1574 } 1575 1576 // Invoke callback function 1577 result = callback(filename, (address)modinfo.lpBaseOfDll, 1578 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param); 1579 if (result) break; 1580 } 1581 1582 CloseHandle(hProcess); 1583 return result; 1584 } 1585 1586 bool os::get_host_name(char* buf, size_t buflen) { 1587 DWORD size = (DWORD)buflen; 1588 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE); 1589 } 1590 1591 void os::get_summary_os_info(char* buf, size_t buflen) { 1592 stringStream sst(buf, buflen); 1593 os::win32::print_windows_version(&sst); 1594 // chop off newline character 1595 char* nl = strchr(buf, '\n'); 1596 if (nl != NULL) *nl = '\0'; 1597 } 1598 1599 int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) { 1600 int ret = vsnprintf(buf, len, fmt, args); 1601 // Get the correct buffer size if buf is too small 1602 if (ret < 0) { 1603 return _vscprintf(fmt, args); 1604 } 1605 return ret; 1606 } 1607 1608 static inline time_t get_mtime(const char* filename) { 1609 struct stat st; 1610 int ret = os::stat(filename, &st); 1611 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 1612 return st.st_mtime; 1613 } 1614 1615 int os::compare_file_modified_times(const char* file1, const char* file2) { 1616 time_t t1 = get_mtime(file1); 1617 time_t t2 = get_mtime(file2); 1618 return t1 - t2; 1619 } 1620 1621 void os::print_os_info_brief(outputStream* st) { 1622 os::print_os_info(st); 1623 } 1624 1625 void os::print_os_info(outputStream* st) { 1626 #ifdef ASSERT 1627 char buffer[1024]; 1628 st->print("HostName: "); 1629 if (get_host_name(buffer, sizeof(buffer))) { 1630 st->print("%s ", buffer); 1631 } else { 1632 st->print("N/A "); 1633 } 1634 #endif 1635 st->print("OS:"); 1636 os::win32::print_windows_version(st); 1637 } 1638 1639 void os::win32::print_windows_version(outputStream* st) { 1640 OSVERSIONINFOEX osvi; 1641 VS_FIXEDFILEINFO *file_info; 1642 TCHAR kernel32_path[MAX_PATH]; 1643 UINT len, ret; 1644 1645 // Use the GetVersionEx information to see if we're on a server or 1646 // workstation edition of Windows. Starting with Windows 8.1 we can't 1647 // trust the OS version information returned by this API. 1648 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1649 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1650 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1651 st->print_cr("Call to GetVersionEx failed"); 1652 return; 1653 } 1654 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION); 1655 1656 // Get the full path to \Windows\System32\kernel32.dll and use that for 1657 // determining what version of Windows we're running on. 1658 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1; 1659 ret = GetSystemDirectory(kernel32_path, len); 1660 if (ret == 0 || ret > len) { 1661 st->print_cr("Call to GetSystemDirectory failed"); 1662 return; 1663 } 1664 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret); 1665 1666 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL); 1667 if (version_size == 0) { 1668 st->print_cr("Call to GetFileVersionInfoSize failed"); 1669 return; 1670 } 1671 1672 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal); 1673 if (version_info == NULL) { 1674 st->print_cr("Failed to allocate version_info"); 1675 return; 1676 } 1677 1678 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) { 1679 os::free(version_info); 1680 st->print_cr("Call to GetFileVersionInfo failed"); 1681 return; 1682 } 1683 1684 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) { 1685 os::free(version_info); 1686 st->print_cr("Call to VerQueryValue failed"); 1687 return; 1688 } 1689 1690 int major_version = HIWORD(file_info->dwProductVersionMS); 1691 int minor_version = LOWORD(file_info->dwProductVersionMS); 1692 int build_number = HIWORD(file_info->dwProductVersionLS); 1693 int build_minor = LOWORD(file_info->dwProductVersionLS); 1694 int os_vers = major_version * 1000 + minor_version; 1695 os::free(version_info); 1696 1697 st->print(" Windows "); 1698 switch (os_vers) { 1699 1700 case 6000: 1701 if (is_workstation) { 1702 st->print("Vista"); 1703 } else { 1704 st->print("Server 2008"); 1705 } 1706 break; 1707 1708 case 6001: 1709 if (is_workstation) { 1710 st->print("7"); 1711 } else { 1712 st->print("Server 2008 R2"); 1713 } 1714 break; 1715 1716 case 6002: 1717 if (is_workstation) { 1718 st->print("8"); 1719 } else { 1720 st->print("Server 2012"); 1721 } 1722 break; 1723 1724 case 6003: 1725 if (is_workstation) { 1726 st->print("8.1"); 1727 } else { 1728 st->print("Server 2012 R2"); 1729 } 1730 break; 1731 1732 case 10000: 1733 if (is_workstation) { 1734 st->print("10"); 1735 } else { 1736 st->print("Server 2016"); 1737 } 1738 break; 1739 1740 default: 1741 // Unrecognized windows, print out its major and minor versions 1742 st->print("%d.%d", major_version, minor_version); 1743 break; 1744 } 1745 1746 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1747 // find out whether we are running on 64 bit processor or not 1748 SYSTEM_INFO si; 1749 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1750 GetNativeSystemInfo(&si); 1751 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1752 st->print(" , 64 bit"); 1753 } 1754 1755 st->print(" Build %d", build_number); 1756 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor); 1757 st->cr(); 1758 } 1759 1760 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1761 // Nothing to do for now. 1762 } 1763 1764 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1765 HKEY key; 1766 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE, 1767 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key); 1768 if (status == ERROR_SUCCESS) { 1769 DWORD size = (DWORD)buflen; 1770 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size); 1771 if (status != ERROR_SUCCESS) { 1772 strncpy(buf, "## __CPU__", buflen); 1773 } 1774 RegCloseKey(key); 1775 } else { 1776 // Put generic cpu info to return 1777 strncpy(buf, "## __CPU__", buflen); 1778 } 1779 } 1780 1781 void os::print_memory_info(outputStream* st) { 1782 st->print("Memory:"); 1783 st->print(" %dk page", os::vm_page_size()>>10); 1784 1785 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1786 // value if total memory is larger than 4GB 1787 MEMORYSTATUSEX ms; 1788 ms.dwLength = sizeof(ms); 1789 GlobalMemoryStatusEx(&ms); 1790 1791 st->print(", physical %uk", os::physical_memory() >> 10); 1792 st->print("(%uk free)", os::available_memory() >> 10); 1793 1794 st->print(", swap %uk", ms.ullTotalPageFile >> 10); 1795 st->print("(%uk free)", ms.ullAvailPageFile >> 10); 1796 st->cr(); 1797 } 1798 1799 void os::print_siginfo(outputStream *st, const void* siginfo) { 1800 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo; 1801 st->print("siginfo:"); 1802 1803 char tmp[64]; 1804 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) { 1805 strcpy(tmp, "EXCEPTION_??"); 1806 } 1807 st->print(" %s (0x%x)", tmp, er->ExceptionCode); 1808 1809 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION || 1810 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) && 1811 er->NumberParameters >= 2) { 1812 switch (er->ExceptionInformation[0]) { 1813 case 0: st->print(", reading address"); break; 1814 case 1: st->print(", writing address"); break; 1815 case 8: st->print(", data execution prevention violation at address"); break; 1816 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1817 er->ExceptionInformation[0]); 1818 } 1819 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1820 } else { 1821 int num = er->NumberParameters; 1822 if (num > 0) { 1823 st->print(", ExceptionInformation="); 1824 for (int i = 0; i < num; i++) { 1825 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1826 } 1827 } 1828 } 1829 st->cr(); 1830 } 1831 1832 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1833 // do nothing 1834 } 1835 1836 static char saved_jvm_path[MAX_PATH] = {0}; 1837 1838 // Find the full path to the current module, jvm.dll 1839 void os::jvm_path(char *buf, jint buflen) { 1840 // Error checking. 1841 if (buflen < MAX_PATH) { 1842 assert(false, "must use a large-enough buffer"); 1843 buf[0] = '\0'; 1844 return; 1845 } 1846 // Lazy resolve the path to current module. 1847 if (saved_jvm_path[0] != 0) { 1848 strcpy(buf, saved_jvm_path); 1849 return; 1850 } 1851 1852 buf[0] = '\0'; 1853 if (Arguments::sun_java_launcher_is_altjvm()) { 1854 // Support for the java launcher's '-XXaltjvm=<path>' option. Check 1855 // for a JAVA_HOME environment variable and fix up the path so it 1856 // looks like jvm.dll is installed there (append a fake suffix 1857 // hotspot/jvm.dll). 1858 char* java_home_var = ::getenv("JAVA_HOME"); 1859 if (java_home_var != NULL && java_home_var[0] != 0 && 1860 strlen(java_home_var) < (size_t)buflen) { 1861 strncpy(buf, java_home_var, buflen); 1862 1863 // determine if this is a legacy image or modules image 1864 // modules image doesn't have "jre" subdirectory 1865 size_t len = strlen(buf); 1866 char* jrebin_p = buf + len; 1867 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1868 if (0 != _access(buf, 0)) { 1869 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1870 } 1871 len = strlen(buf); 1872 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1873 } 1874 } 1875 1876 if (buf[0] == '\0') { 1877 GetModuleFileName(vm_lib_handle, buf, buflen); 1878 } 1879 strncpy(saved_jvm_path, buf, MAX_PATH); 1880 saved_jvm_path[MAX_PATH - 1] = '\0'; 1881 } 1882 1883 1884 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1885 #ifndef _WIN64 1886 st->print("_"); 1887 #endif 1888 } 1889 1890 1891 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1892 #ifndef _WIN64 1893 st->print("@%d", args_size * sizeof(int)); 1894 #endif 1895 } 1896 1897 // This method is a copy of JDK's sysGetLastErrorString 1898 // from src/windows/hpi/src/system_md.c 1899 1900 size_t os::lasterror(char* buf, size_t len) { 1901 DWORD errval; 1902 1903 if ((errval = GetLastError()) != 0) { 1904 // DOS error 1905 size_t n = (size_t)FormatMessage( 1906 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1907 NULL, 1908 errval, 1909 0, 1910 buf, 1911 (DWORD)len, 1912 NULL); 1913 if (n > 3) { 1914 // Drop final '.', CR, LF 1915 if (buf[n - 1] == '\n') n--; 1916 if (buf[n - 1] == '\r') n--; 1917 if (buf[n - 1] == '.') n--; 1918 buf[n] = '\0'; 1919 } 1920 return n; 1921 } 1922 1923 if (errno != 0) { 1924 // C runtime error that has no corresponding DOS error code 1925 const char* s = os::strerror(errno); 1926 size_t n = strlen(s); 1927 if (n >= len) n = len - 1; 1928 strncpy(buf, s, n); 1929 buf[n] = '\0'; 1930 return n; 1931 } 1932 1933 return 0; 1934 } 1935 1936 int os::get_last_error() { 1937 DWORD error = GetLastError(); 1938 if (error == 0) { 1939 error = errno; 1940 } 1941 return (int)error; 1942 } 1943 1944 WindowsSemaphore::WindowsSemaphore(uint value) { 1945 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL); 1946 1947 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError()); 1948 } 1949 1950 WindowsSemaphore::~WindowsSemaphore() { 1951 ::CloseHandle(_semaphore); 1952 } 1953 1954 void WindowsSemaphore::signal(uint count) { 1955 if (count > 0) { 1956 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL); 1957 1958 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError()); 1959 } 1960 } 1961 1962 void WindowsSemaphore::wait() { 1963 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE); 1964 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError()); 1965 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret); 1966 } 1967 1968 // sun.misc.Signal 1969 // NOTE that this is a workaround for an apparent kernel bug where if 1970 // a signal handler for SIGBREAK is installed then that signal handler 1971 // takes priority over the console control handler for CTRL_CLOSE_EVENT. 1972 // See bug 4416763. 1973 static void (*sigbreakHandler)(int) = NULL; 1974 1975 static void UserHandler(int sig, void *siginfo, void *context) { 1976 os::signal_notify(sig); 1977 // We need to reinstate the signal handler each time... 1978 os::signal(sig, (void*)UserHandler); 1979 } 1980 1981 void* os::user_handler() { 1982 return (void*) UserHandler; 1983 } 1984 1985 void* os::signal(int signal_number, void* handler) { 1986 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1987 void (*oldHandler)(int) = sigbreakHandler; 1988 sigbreakHandler = (void (*)(int)) handler; 1989 return (void*) oldHandler; 1990 } else { 1991 return (void*)::signal(signal_number, (void (*)(int))handler); 1992 } 1993 } 1994 1995 void os::signal_raise(int signal_number) { 1996 raise(signal_number); 1997 } 1998 1999 // The Win32 C runtime library maps all console control events other than ^C 2000 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 2001 // logoff, and shutdown events. We therefore install our own console handler 2002 // that raises SIGTERM for the latter cases. 2003 // 2004 static BOOL WINAPI consoleHandler(DWORD event) { 2005 switch (event) { 2006 case CTRL_C_EVENT: 2007 if (is_error_reported()) { 2008 // Ctrl-C is pressed during error reporting, likely because the error 2009 // handler fails to abort. Let VM die immediately. 2010 os::die(); 2011 } 2012 2013 os::signal_raise(SIGINT); 2014 return TRUE; 2015 break; 2016 case CTRL_BREAK_EVENT: 2017 if (sigbreakHandler != NULL) { 2018 (*sigbreakHandler)(SIGBREAK); 2019 } 2020 return TRUE; 2021 break; 2022 case CTRL_LOGOFF_EVENT: { 2023 // Don't terminate JVM if it is running in a non-interactive session, 2024 // such as a service process. 2025 USEROBJECTFLAGS flags; 2026 HANDLE handle = GetProcessWindowStation(); 2027 if (handle != NULL && 2028 GetUserObjectInformation(handle, UOI_FLAGS, &flags, 2029 sizeof(USEROBJECTFLAGS), NULL)) { 2030 // If it is a non-interactive session, let next handler to deal 2031 // with it. 2032 if ((flags.dwFlags & WSF_VISIBLE) == 0) { 2033 return FALSE; 2034 } 2035 } 2036 } 2037 case CTRL_CLOSE_EVENT: 2038 case CTRL_SHUTDOWN_EVENT: 2039 os::signal_raise(SIGTERM); 2040 return TRUE; 2041 break; 2042 default: 2043 break; 2044 } 2045 return FALSE; 2046 } 2047 2048 // The following code is moved from os.cpp for making this 2049 // code platform specific, which it is by its very nature. 2050 2051 // Return maximum OS signal used + 1 for internal use only 2052 // Used as exit signal for signal_thread 2053 int os::sigexitnum_pd() { 2054 return NSIG; 2055 } 2056 2057 // a counter for each possible signal value, including signal_thread exit signal 2058 static volatile jint pending_signals[NSIG+1] = { 0 }; 2059 static HANDLE sig_sem = NULL; 2060 2061 void os::signal_init_pd() { 2062 // Initialize signal structures 2063 memset((void*)pending_signals, 0, sizeof(pending_signals)); 2064 2065 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 2066 2067 // Programs embedding the VM do not want it to attempt to receive 2068 // events like CTRL_LOGOFF_EVENT, which are used to implement the 2069 // shutdown hooks mechanism introduced in 1.3. For example, when 2070 // the VM is run as part of a Windows NT service (i.e., a servlet 2071 // engine in a web server), the correct behavior is for any console 2072 // control handler to return FALSE, not TRUE, because the OS's 2073 // "final" handler for such events allows the process to continue if 2074 // it is a service (while terminating it if it is not a service). 2075 // To make this behavior uniform and the mechanism simpler, we 2076 // completely disable the VM's usage of these console events if -Xrs 2077 // (=ReduceSignalUsage) is specified. This means, for example, that 2078 // the CTRL-BREAK thread dump mechanism is also disabled in this 2079 // case. See bugs 4323062, 4345157, and related bugs. 2080 2081 if (!ReduceSignalUsage) { 2082 // Add a CTRL-C handler 2083 SetConsoleCtrlHandler(consoleHandler, TRUE); 2084 } 2085 } 2086 2087 void os::signal_notify(int signal_number) { 2088 BOOL ret; 2089 if (sig_sem != NULL) { 2090 Atomic::inc(&pending_signals[signal_number]); 2091 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2092 assert(ret != 0, "ReleaseSemaphore() failed"); 2093 } 2094 } 2095 2096 static int check_pending_signals(bool wait_for_signal) { 2097 DWORD ret; 2098 while (true) { 2099 for (int i = 0; i < NSIG + 1; i++) { 2100 jint n = pending_signals[i]; 2101 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2102 return i; 2103 } 2104 } 2105 if (!wait_for_signal) { 2106 return -1; 2107 } 2108 2109 JavaThread *thread = JavaThread::current(); 2110 2111 ThreadBlockInVM tbivm(thread); 2112 2113 bool threadIsSuspended; 2114 do { 2115 thread->set_suspend_equivalent(); 2116 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2117 ret = ::WaitForSingleObject(sig_sem, INFINITE); 2118 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 2119 2120 // were we externally suspended while we were waiting? 2121 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2122 if (threadIsSuspended) { 2123 // The semaphore has been incremented, but while we were waiting 2124 // another thread suspended us. We don't want to continue running 2125 // while suspended because that would surprise the thread that 2126 // suspended us. 2127 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2128 assert(ret != 0, "ReleaseSemaphore() failed"); 2129 2130 thread->java_suspend_self(); 2131 } 2132 } while (threadIsSuspended); 2133 } 2134 } 2135 2136 int os::signal_lookup() { 2137 return check_pending_signals(false); 2138 } 2139 2140 int os::signal_wait() { 2141 return check_pending_signals(true); 2142 } 2143 2144 // Implicit OS exception handling 2145 2146 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, 2147 address handler) { 2148 JavaThread* thread = (JavaThread*) Thread::current_or_null(); 2149 // Save pc in thread 2150 #ifdef _M_IA64 2151 // Do not blow up if no thread info available. 2152 if (thread) { 2153 // Saving PRECISE pc (with slot information) in thread. 2154 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress; 2155 // Convert precise PC into "Unix" format 2156 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2); 2157 thread->set_saved_exception_pc((address)precise_pc); 2158 } 2159 // Set pc to handler 2160 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 2161 // Clear out psr.ri (= Restart Instruction) in order to continue 2162 // at the beginning of the target bundle. 2163 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF; 2164 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!"); 2165 #else 2166 #ifdef _M_AMD64 2167 // Do not blow up if no thread info available. 2168 if (thread) { 2169 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip); 2170 } 2171 // Set pc to handler 2172 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 2173 #else 2174 // Do not blow up if no thread info available. 2175 if (thread) { 2176 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip); 2177 } 2178 // Set pc to handler 2179 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler; 2180 #endif 2181 #endif 2182 2183 // Continue the execution 2184 return EXCEPTION_CONTINUE_EXECUTION; 2185 } 2186 2187 2188 // Used for PostMortemDump 2189 extern "C" void safepoints(); 2190 extern "C" void find(int x); 2191 extern "C" void events(); 2192 2193 // According to Windows API documentation, an illegal instruction sequence should generate 2194 // the 0xC000001C exception code. However, real world experience shows that occasionnaly 2195 // the execution of an illegal instruction can generate the exception code 0xC000001E. This 2196 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 2197 2198 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 2199 2200 // From "Execution Protection in the Windows Operating System" draft 0.35 2201 // Once a system header becomes available, the "real" define should be 2202 // included or copied here. 2203 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2204 2205 // Handle NAT Bit consumption on IA64. 2206 #ifdef _M_IA64 2207 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION 2208 #endif 2209 2210 // Windows Vista/2008 heap corruption check 2211 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374 2212 2213 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual 2214 // C++ compiler contain this error code. Because this is a compiler-generated 2215 // error, the code is not listed in the Win32 API header files. 2216 // The code is actually a cryptic mnemonic device, with the initial "E" 2217 // standing for "exception" and the final 3 bytes (0x6D7363) representing the 2218 // ASCII values of "msc". 2219 2220 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363 2221 2222 #define def_excpt(val) { #val, (val) } 2223 2224 static const struct { char* name; uint number; } exceptlabels[] = { 2225 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2226 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2227 def_excpt(EXCEPTION_BREAKPOINT), 2228 def_excpt(EXCEPTION_SINGLE_STEP), 2229 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2230 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2231 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2232 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2233 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2234 def_excpt(EXCEPTION_FLT_OVERFLOW), 2235 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2236 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2237 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2238 def_excpt(EXCEPTION_INT_OVERFLOW), 2239 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2240 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2241 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2242 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2243 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2244 def_excpt(EXCEPTION_STACK_OVERFLOW), 2245 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2246 def_excpt(EXCEPTION_GUARD_PAGE), 2247 def_excpt(EXCEPTION_INVALID_HANDLE), 2248 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION), 2249 def_excpt(EXCEPTION_HEAP_CORRUPTION) 2250 #ifdef _M_IA64 2251 , def_excpt(EXCEPTION_REG_NAT_CONSUMPTION) 2252 #endif 2253 }; 2254 2255 #undef def_excpt 2256 2257 const char* os::exception_name(int exception_code, char *buf, size_t size) { 2258 uint code = static_cast<uint>(exception_code); 2259 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) { 2260 if (exceptlabels[i].number == code) { 2261 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2262 return buf; 2263 } 2264 } 2265 2266 return NULL; 2267 } 2268 2269 //----------------------------------------------------------------------------- 2270 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2271 // handle exception caused by idiv; should only happen for -MinInt/-1 2272 // (division by zero is handled explicitly) 2273 #ifdef _M_IA64 2274 assert(0, "Fix Handle_IDiv_Exception"); 2275 #else 2276 #ifdef _M_AMD64 2277 PCONTEXT ctx = exceptionInfo->ContextRecord; 2278 address pc = (address)ctx->Rip; 2279 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode"); 2280 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2281 if (pc[0] == 0xF7) { 2282 // set correct result values and continue after idiv instruction 2283 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes 2284 } else { 2285 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes 2286 } 2287 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation) 2288 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the 2289 // idiv opcode (0xF7). 2290 ctx->Rdx = (DWORD)0; // remainder 2291 // Continue the execution 2292 #else 2293 PCONTEXT ctx = exceptionInfo->ContextRecord; 2294 address pc = (address)ctx->Eip; 2295 assert(pc[0] == 0xF7, "not an idiv opcode"); 2296 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2297 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2298 // set correct result values and continue after idiv instruction 2299 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2300 ctx->Eax = (DWORD)min_jint; // result 2301 ctx->Edx = (DWORD)0; // remainder 2302 // Continue the execution 2303 #endif 2304 #endif 2305 return EXCEPTION_CONTINUE_EXECUTION; 2306 } 2307 2308 //----------------------------------------------------------------------------- 2309 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2310 PCONTEXT ctx = exceptionInfo->ContextRecord; 2311 #ifndef _WIN64 2312 // handle exception caused by native method modifying control word 2313 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2314 2315 switch (exception_code) { 2316 case EXCEPTION_FLT_DENORMAL_OPERAND: 2317 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2318 case EXCEPTION_FLT_INEXACT_RESULT: 2319 case EXCEPTION_FLT_INVALID_OPERATION: 2320 case EXCEPTION_FLT_OVERFLOW: 2321 case EXCEPTION_FLT_STACK_CHECK: 2322 case EXCEPTION_FLT_UNDERFLOW: 2323 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2324 if (fp_control_word != ctx->FloatSave.ControlWord) { 2325 // Restore FPCW and mask out FLT exceptions 2326 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2327 // Mask out pending FLT exceptions 2328 ctx->FloatSave.StatusWord &= 0xffffff00; 2329 return EXCEPTION_CONTINUE_EXECUTION; 2330 } 2331 } 2332 2333 if (prev_uef_handler != NULL) { 2334 // We didn't handle this exception so pass it to the previous 2335 // UnhandledExceptionFilter. 2336 return (prev_uef_handler)(exceptionInfo); 2337 } 2338 #else // !_WIN64 2339 // On Windows, the mxcsr control bits are non-volatile across calls 2340 // See also CR 6192333 2341 // 2342 jint MxCsr = INITIAL_MXCSR; 2343 // we can't use StubRoutines::addr_mxcsr_std() 2344 // because in Win64 mxcsr is not saved there 2345 if (MxCsr != ctx->MxCsr) { 2346 ctx->MxCsr = MxCsr; 2347 return EXCEPTION_CONTINUE_EXECUTION; 2348 } 2349 #endif // !_WIN64 2350 2351 return EXCEPTION_CONTINUE_SEARCH; 2352 } 2353 2354 static inline void report_error(Thread* t, DWORD exception_code, 2355 address addr, void* siginfo, void* context) { 2356 VMError::report_and_die(t, exception_code, addr, siginfo, context); 2357 2358 // If UseOsErrorReporting, this will return here and save the error file 2359 // somewhere where we can find it in the minidump. 2360 } 2361 2362 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread, 2363 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) { 2364 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2365 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2366 if (Interpreter::contains(pc)) { 2367 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord); 2368 if (!fr->is_first_java_frame()) { 2369 assert(fr->safe_for_sender(thread), "Safety check"); 2370 *fr = fr->java_sender(); 2371 } 2372 } else { 2373 // more complex code with compiled code 2374 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above"); 2375 CodeBlob* cb = CodeCache::find_blob(pc); 2376 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) { 2377 // Not sure where the pc points to, fallback to default 2378 // stack overflow handling 2379 return false; 2380 } else { 2381 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord); 2382 // in compiled code, the stack banging is performed just after the return pc 2383 // has been pushed on the stack 2384 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp())); 2385 if (!fr->is_java_frame()) { 2386 assert(fr->safe_for_sender(thread), "Safety check"); 2387 *fr = fr->java_sender(); 2388 } 2389 } 2390 } 2391 assert(fr->is_java_frame(), "Safety check"); 2392 return true; 2393 } 2394 2395 //----------------------------------------------------------------------------- 2396 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2397 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2398 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2399 #ifdef _M_IA64 2400 // On Itanium, we need the "precise pc", which has the slot number coded 2401 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format). 2402 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress; 2403 // Convert the pc to "Unix format", which has the slot number coded 2404 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2 2405 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction" 2406 // information is saved in the Unix format. 2407 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2)); 2408 #else 2409 #ifdef _M_AMD64 2410 address pc = (address) exceptionInfo->ContextRecord->Rip; 2411 #else 2412 address pc = (address) exceptionInfo->ContextRecord->Eip; 2413 #endif 2414 #endif 2415 Thread* t = Thread::current_or_null_safe(); 2416 2417 // Handle SafeFetch32 and SafeFetchN exceptions. 2418 if (StubRoutines::is_safefetch_fault(pc)) { 2419 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc)); 2420 } 2421 2422 #ifndef _WIN64 2423 // Execution protection violation - win32 running on AMD64 only 2424 // Handled first to avoid misdiagnosis as a "normal" access violation; 2425 // This is safe to do because we have a new/unique ExceptionInformation 2426 // code for this condition. 2427 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2428 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2429 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2430 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2431 2432 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2433 int page_size = os::vm_page_size(); 2434 2435 // Make sure the pc and the faulting address are sane. 2436 // 2437 // If an instruction spans a page boundary, and the page containing 2438 // the beginning of the instruction is executable but the following 2439 // page is not, the pc and the faulting address might be slightly 2440 // different - we still want to unguard the 2nd page in this case. 2441 // 2442 // 15 bytes seems to be a (very) safe value for max instruction size. 2443 bool pc_is_near_addr = 2444 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2445 bool instr_spans_page_boundary = 2446 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2447 (intptr_t) page_size) > 0); 2448 2449 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2450 static volatile address last_addr = 2451 (address) os::non_memory_address_word(); 2452 2453 // In conservative mode, don't unguard unless the address is in the VM 2454 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2455 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2456 2457 // Set memory to RWX and retry 2458 address page_start = 2459 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2460 bool res = os::protect_memory((char*) page_start, page_size, 2461 os::MEM_PROT_RWX); 2462 2463 log_debug(os)("Execution protection violation " 2464 "at " INTPTR_FORMAT 2465 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr), 2466 p2i(page_start), (res ? "success" : os::strerror(errno))); 2467 2468 // Set last_addr so if we fault again at the same address, we don't 2469 // end up in an endless loop. 2470 // 2471 // There are two potential complications here. Two threads trapping 2472 // at the same address at the same time could cause one of the 2473 // threads to think it already unguarded, and abort the VM. Likely 2474 // very rare. 2475 // 2476 // The other race involves two threads alternately trapping at 2477 // different addresses and failing to unguard the page, resulting in 2478 // an endless loop. This condition is probably even more unlikely 2479 // than the first. 2480 // 2481 // Although both cases could be avoided by using locks or thread 2482 // local last_addr, these solutions are unnecessary complication: 2483 // this handler is a best-effort safety net, not a complete solution. 2484 // It is disabled by default and should only be used as a workaround 2485 // in case we missed any no-execute-unsafe VM code. 2486 2487 last_addr = addr; 2488 2489 return EXCEPTION_CONTINUE_EXECUTION; 2490 } 2491 } 2492 2493 // Last unguard failed or not unguarding 2494 tty->print_raw_cr("Execution protection violation"); 2495 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2496 exceptionInfo->ContextRecord); 2497 return EXCEPTION_CONTINUE_SEARCH; 2498 } 2499 } 2500 #endif // _WIN64 2501 2502 // Check to see if we caught the safepoint code in the 2503 // process of write protecting the memory serialization page. 2504 // It write enables the page immediately after protecting it 2505 // so just return. 2506 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2507 JavaThread* thread = (JavaThread*) t; 2508 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2509 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2510 if (os::is_memory_serialize_page(thread, addr)) { 2511 // Block current thread until the memory serialize page permission restored. 2512 os::block_on_serialize_page_trap(); 2513 return EXCEPTION_CONTINUE_EXECUTION; 2514 } 2515 } 2516 2517 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) && 2518 VM_Version::is_cpuinfo_segv_addr(pc)) { 2519 // Verify that OS save/restore AVX registers. 2520 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr()); 2521 } 2522 2523 if (t != NULL && t->is_Java_thread()) { 2524 JavaThread* thread = (JavaThread*) t; 2525 bool in_java = thread->thread_state() == _thread_in_Java; 2526 2527 // Handle potential stack overflows up front. 2528 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2529 #ifdef _M_IA64 2530 // Use guard page for register stack. 2531 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2532 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2533 // Check for a register stack overflow on Itanium 2534 if (thread->addr_inside_register_stack_red_zone(addr)) { 2535 // Fatal red zone violation happens if the Java program 2536 // catches a StackOverflow error and does so much processing 2537 // that it runs beyond the unprotected yellow guard zone. As 2538 // a result, we are out of here. 2539 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit."); 2540 } else if(thread->addr_inside_register_stack(addr)) { 2541 // Disable the yellow zone which sets the state that 2542 // we've got a stack overflow problem. 2543 if (thread->stack_yellow_reserved_zone_enabled()) { 2544 thread->disable_stack_yellow_reserved_zone(); 2545 } 2546 // Give us some room to process the exception. 2547 thread->disable_register_stack_guard(); 2548 // Tracing with +Verbose. 2549 if (Verbose) { 2550 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc); 2551 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr); 2552 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base()); 2553 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]", 2554 thread->register_stack_base(), 2555 thread->register_stack_base() + thread->stack_size()); 2556 } 2557 2558 // Reguard the permanent register stack red zone just to be sure. 2559 // We saw Windows silently disabling this without telling us. 2560 thread->enable_register_stack_red_zone(); 2561 2562 return Handle_Exception(exceptionInfo, 2563 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2564 } 2565 #endif 2566 if (thread->stack_guards_enabled()) { 2567 if (_thread_in_Java) { 2568 frame fr; 2569 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2570 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2571 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) { 2572 assert(fr.is_java_frame(), "Must be a Java frame"); 2573 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr); 2574 } 2575 } 2576 // Yellow zone violation. The o/s has unprotected the first yellow 2577 // zone page for us. Note: must call disable_stack_yellow_zone to 2578 // update the enabled status, even if the zone contains only one page. 2579 thread->disable_stack_yellow_reserved_zone(); 2580 // If not in java code, return and hope for the best. 2581 return in_java 2582 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2583 : EXCEPTION_CONTINUE_EXECUTION; 2584 } else { 2585 // Fatal red zone violation. 2586 thread->disable_stack_red_zone(); 2587 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2588 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2589 exceptionInfo->ContextRecord); 2590 return EXCEPTION_CONTINUE_SEARCH; 2591 } 2592 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2593 // Either stack overflow or null pointer exception. 2594 if (in_java) { 2595 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2596 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2597 address stack_end = thread->stack_end(); 2598 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2599 // Stack overflow. 2600 assert(!os::uses_stack_guard_pages(), 2601 "should be caught by red zone code above."); 2602 return Handle_Exception(exceptionInfo, 2603 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2604 } 2605 // Check for safepoint polling and implicit null 2606 // We only expect null pointers in the stubs (vtable) 2607 // the rest are checked explicitly now. 2608 CodeBlob* cb = CodeCache::find_blob(pc); 2609 if (cb != NULL) { 2610 if (os::is_poll_address(addr)) { 2611 address stub = SharedRuntime::get_poll_stub(pc); 2612 return Handle_Exception(exceptionInfo, stub); 2613 } 2614 } 2615 { 2616 #ifdef _WIN64 2617 // If it's a legal stack address map the entire region in 2618 // 2619 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2620 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2621 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) { 2622 addr = (address)((uintptr_t)addr & 2623 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2624 os::commit_memory((char *)addr, thread->stack_base() - addr, 2625 !ExecMem); 2626 return EXCEPTION_CONTINUE_EXECUTION; 2627 } else 2628 #endif 2629 { 2630 // Null pointer exception. 2631 #ifdef _M_IA64 2632 // Process implicit null checks in compiled code. Note: Implicit null checks 2633 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs. 2634 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) { 2635 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format); 2636 // Handle implicit null check in UEP method entry 2637 if (cb && (cb->is_frame_complete_at(pc) || 2638 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) { 2639 if (Verbose) { 2640 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0); 2641 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format); 2642 tty->print_cr(" to addr " INTPTR_FORMAT, addr); 2643 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)", 2644 *(bundle_start + 1), *bundle_start); 2645 } 2646 return Handle_Exception(exceptionInfo, 2647 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL)); 2648 } 2649 } 2650 2651 // Implicit null checks were processed above. Hence, we should not reach 2652 // here in the usual case => die! 2653 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception"); 2654 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2655 exceptionInfo->ContextRecord); 2656 return EXCEPTION_CONTINUE_SEARCH; 2657 2658 #else // !IA64 2659 2660 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr)) { 2661 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2662 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2663 } 2664 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2665 exceptionInfo->ContextRecord); 2666 return EXCEPTION_CONTINUE_SEARCH; 2667 #endif 2668 } 2669 } 2670 } 2671 2672 #ifdef _WIN64 2673 // Special care for fast JNI field accessors. 2674 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2675 // in and the heap gets shrunk before the field access. 2676 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2677 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2678 if (addr != (address)-1) { 2679 return Handle_Exception(exceptionInfo, addr); 2680 } 2681 } 2682 #endif 2683 2684 // Stack overflow or null pointer exception in native code. 2685 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2686 exceptionInfo->ContextRecord); 2687 return EXCEPTION_CONTINUE_SEARCH; 2688 } // /EXCEPTION_ACCESS_VIOLATION 2689 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2690 #if defined _M_IA64 2691 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION || 2692 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) { 2693 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0); 2694 2695 // Compiled method patched to be non entrant? Following conditions must apply: 2696 // 1. must be first instruction in bundle 2697 // 2. must be a break instruction with appropriate code 2698 if ((((uint64_t) pc & 0x0F) == 0) && 2699 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) { 2700 return Handle_Exception(exceptionInfo, 2701 (address)SharedRuntime::get_handle_wrong_method_stub()); 2702 } 2703 } // /EXCEPTION_ILLEGAL_INSTRUCTION 2704 #endif 2705 2706 2707 if (in_java) { 2708 switch (exception_code) { 2709 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2710 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2711 2712 case EXCEPTION_INT_OVERFLOW: 2713 return Handle_IDiv_Exception(exceptionInfo); 2714 2715 } // switch 2716 } 2717 if (((thread->thread_state() == _thread_in_Java) || 2718 (thread->thread_state() == _thread_in_native)) && 2719 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) { 2720 LONG result=Handle_FLT_Exception(exceptionInfo); 2721 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2722 } 2723 } 2724 2725 if (exception_code != EXCEPTION_BREAKPOINT) { 2726 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2727 exceptionInfo->ContextRecord); 2728 } 2729 return EXCEPTION_CONTINUE_SEARCH; 2730 } 2731 2732 #ifndef _WIN64 2733 // Special care for fast JNI accessors. 2734 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2735 // the heap gets shrunk before the field access. 2736 // Need to install our own structured exception handler since native code may 2737 // install its own. 2738 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2739 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2740 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2741 address pc = (address) exceptionInfo->ContextRecord->Eip; 2742 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2743 if (addr != (address)-1) { 2744 return Handle_Exception(exceptionInfo, addr); 2745 } 2746 } 2747 return EXCEPTION_CONTINUE_SEARCH; 2748 } 2749 2750 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \ 2751 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \ 2752 jobject obj, \ 2753 jfieldID fieldID) { \ 2754 __try { \ 2755 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \ 2756 obj, \ 2757 fieldID); \ 2758 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \ 2759 _exception_info())) { \ 2760 } \ 2761 return 0; \ 2762 } 2763 2764 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2765 DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2766 DEFINE_FAST_GETFIELD(jchar, char, Char) 2767 DEFINE_FAST_GETFIELD(jshort, short, Short) 2768 DEFINE_FAST_GETFIELD(jint, int, Int) 2769 DEFINE_FAST_GETFIELD(jlong, long, Long) 2770 DEFINE_FAST_GETFIELD(jfloat, float, Float) 2771 DEFINE_FAST_GETFIELD(jdouble, double, Double) 2772 2773 address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2774 switch (type) { 2775 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2776 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2777 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2778 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2779 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2780 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2781 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2782 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2783 default: ShouldNotReachHere(); 2784 } 2785 return (address)-1; 2786 } 2787 #endif 2788 2789 // Virtual Memory 2790 2791 int os::vm_page_size() { return os::win32::vm_page_size(); } 2792 int os::vm_allocation_granularity() { 2793 return os::win32::vm_allocation_granularity(); 2794 } 2795 2796 // Windows large page support is available on Windows 2003. In order to use 2797 // large page memory, the administrator must first assign additional privilege 2798 // to the user: 2799 // + select Control Panel -> Administrative Tools -> Local Security Policy 2800 // + select Local Policies -> User Rights Assignment 2801 // + double click "Lock pages in memory", add users and/or groups 2802 // + reboot 2803 // Note the above steps are needed for administrator as well, as administrators 2804 // by default do not have the privilege to lock pages in memory. 2805 // 2806 // Note about Windows 2003: although the API supports committing large page 2807 // memory on a page-by-page basis and VirtualAlloc() returns success under this 2808 // scenario, I found through experiment it only uses large page if the entire 2809 // memory region is reserved and committed in a single VirtualAlloc() call. 2810 // This makes Windows large page support more or less like Solaris ISM, in 2811 // that the entire heap must be committed upfront. This probably will change 2812 // in the future, if so the code below needs to be revisited. 2813 2814 #ifndef MEM_LARGE_PAGES 2815 #define MEM_LARGE_PAGES 0x20000000 2816 #endif 2817 2818 static HANDLE _hProcess; 2819 static HANDLE _hToken; 2820 2821 // Container for NUMA node list info 2822 class NUMANodeListHolder { 2823 private: 2824 int *_numa_used_node_list; // allocated below 2825 int _numa_used_node_count; 2826 2827 void free_node_list() { 2828 if (_numa_used_node_list != NULL) { 2829 FREE_C_HEAP_ARRAY(int, _numa_used_node_list); 2830 } 2831 } 2832 2833 public: 2834 NUMANodeListHolder() { 2835 _numa_used_node_count = 0; 2836 _numa_used_node_list = NULL; 2837 // do rest of initialization in build routine (after function pointers are set up) 2838 } 2839 2840 ~NUMANodeListHolder() { 2841 free_node_list(); 2842 } 2843 2844 bool build() { 2845 DWORD_PTR proc_aff_mask; 2846 DWORD_PTR sys_aff_mask; 2847 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false; 2848 ULONG highest_node_number; 2849 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false; 2850 free_node_list(); 2851 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal); 2852 for (unsigned int i = 0; i <= highest_node_number; i++) { 2853 ULONGLONG proc_mask_numa_node; 2854 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false; 2855 if ((proc_aff_mask & proc_mask_numa_node)!=0) { 2856 _numa_used_node_list[_numa_used_node_count++] = i; 2857 } 2858 } 2859 return (_numa_used_node_count > 1); 2860 } 2861 2862 int get_count() { return _numa_used_node_count; } 2863 int get_node_list_entry(int n) { 2864 // for indexes out of range, returns -1 2865 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1); 2866 } 2867 2868 } numa_node_list_holder; 2869 2870 2871 2872 static size_t _large_page_size = 0; 2873 2874 static bool request_lock_memory_privilege() { 2875 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2876 os::current_process_id()); 2877 2878 LUID luid; 2879 if (_hProcess != NULL && 2880 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2881 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2882 2883 TOKEN_PRIVILEGES tp; 2884 tp.PrivilegeCount = 1; 2885 tp.Privileges[0].Luid = luid; 2886 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2887 2888 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2889 // privilege. Check GetLastError() too. See MSDN document. 2890 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2891 (GetLastError() == ERROR_SUCCESS)) { 2892 return true; 2893 } 2894 } 2895 2896 return false; 2897 } 2898 2899 static void cleanup_after_large_page_init() { 2900 if (_hProcess) CloseHandle(_hProcess); 2901 _hProcess = NULL; 2902 if (_hToken) CloseHandle(_hToken); 2903 _hToken = NULL; 2904 } 2905 2906 static bool numa_interleaving_init() { 2907 bool success = false; 2908 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving); 2909 2910 // print a warning if UseNUMAInterleaving flag is specified on command line 2911 bool warn_on_failure = use_numa_interleaving_specified; 2912 #define WARN(msg) if (warn_on_failure) { warning(msg); } 2913 2914 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages) 2915 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2916 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity); 2917 2918 if (numa_node_list_holder.build()) { 2919 if (log_is_enabled(Debug, os, cpu)) { 2920 Log(os, cpu) log; 2921 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count()); 2922 for (int i = 0; i < numa_node_list_holder.get_count(); i++) { 2923 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i)); 2924 } 2925 } 2926 success = true; 2927 } else { 2928 WARN("Process does not cover multiple NUMA nodes."); 2929 } 2930 if (!success) { 2931 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag."); 2932 } 2933 return success; 2934 #undef WARN 2935 } 2936 2937 // this routine is used whenever we need to reserve a contiguous VA range 2938 // but we need to make separate VirtualAlloc calls for each piece of the range 2939 // Reasons for doing this: 2940 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise) 2941 // * UseNUMAInterleaving requires a separate node for each piece 2942 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, 2943 DWORD prot, 2944 bool should_inject_error = false) { 2945 char * p_buf; 2946 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size 2947 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2948 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size; 2949 2950 // first reserve enough address space in advance since we want to be 2951 // able to break a single contiguous virtual address range into multiple 2952 // large page commits but WS2003 does not allow reserving large page space 2953 // so we just use 4K pages for reserve, this gives us a legal contiguous 2954 // address space. then we will deallocate that reservation, and re alloc 2955 // using large pages 2956 const size_t size_of_reserve = bytes + chunk_size; 2957 if (bytes > size_of_reserve) { 2958 // Overflowed. 2959 return NULL; 2960 } 2961 p_buf = (char *) VirtualAlloc(addr, 2962 size_of_reserve, // size of Reserve 2963 MEM_RESERVE, 2964 PAGE_READWRITE); 2965 // If reservation failed, return NULL 2966 if (p_buf == NULL) return NULL; 2967 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC); 2968 os::release_memory(p_buf, bytes + chunk_size); 2969 2970 // we still need to round up to a page boundary (in case we are using large pages) 2971 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size) 2972 // instead we handle this in the bytes_to_rq computation below 2973 p_buf = (char *) align_size_up((size_t)p_buf, page_size); 2974 2975 // now go through and allocate one chunk at a time until all bytes are 2976 // allocated 2977 size_t bytes_remaining = bytes; 2978 // An overflow of align_size_up() would have been caught above 2979 // in the calculation of size_of_reserve. 2980 char * next_alloc_addr = p_buf; 2981 HANDLE hProc = GetCurrentProcess(); 2982 2983 #ifdef ASSERT 2984 // Variable for the failure injection 2985 long ran_num = os::random(); 2986 size_t fail_after = ran_num % bytes; 2987 #endif 2988 2989 int count=0; 2990 while (bytes_remaining) { 2991 // select bytes_to_rq to get to the next chunk_size boundary 2992 2993 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size)); 2994 // Note allocate and commit 2995 char * p_new; 2996 2997 #ifdef ASSERT 2998 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after); 2999 #else 3000 const bool inject_error_now = false; 3001 #endif 3002 3003 if (inject_error_now) { 3004 p_new = NULL; 3005 } else { 3006 if (!UseNUMAInterleaving) { 3007 p_new = (char *) VirtualAlloc(next_alloc_addr, 3008 bytes_to_rq, 3009 flags, 3010 prot); 3011 } else { 3012 // get the next node to use from the used_node_list 3013 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected"); 3014 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count()); 3015 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node); 3016 } 3017 } 3018 3019 if (p_new == NULL) { 3020 // Free any allocated pages 3021 if (next_alloc_addr > p_buf) { 3022 // Some memory was committed so release it. 3023 size_t bytes_to_release = bytes - bytes_remaining; 3024 // NMT has yet to record any individual blocks, so it 3025 // need to create a dummy 'reserve' record to match 3026 // the release. 3027 MemTracker::record_virtual_memory_reserve((address)p_buf, 3028 bytes_to_release, CALLER_PC); 3029 os::release_memory(p_buf, bytes_to_release); 3030 } 3031 #ifdef ASSERT 3032 if (should_inject_error) { 3033 log_develop_debug(pagesize)("Reserving pages individually failed."); 3034 } 3035 #endif 3036 return NULL; 3037 } 3038 3039 bytes_remaining -= bytes_to_rq; 3040 next_alloc_addr += bytes_to_rq; 3041 count++; 3042 } 3043 // Although the memory is allocated individually, it is returned as one. 3044 // NMT records it as one block. 3045 if ((flags & MEM_COMMIT) != 0) { 3046 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC); 3047 } else { 3048 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC); 3049 } 3050 3051 // made it this far, success 3052 return p_buf; 3053 } 3054 3055 3056 3057 void os::large_page_init() { 3058 if (!UseLargePages) return; 3059 3060 // print a warning if any large page related flag is specified on command line 3061 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 3062 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 3063 bool success = false; 3064 3065 #define WARN(msg) if (warn_on_failure) { warning(msg); } 3066 if (request_lock_memory_privilege()) { 3067 size_t s = GetLargePageMinimum(); 3068 if (s) { 3069 #if defined(IA32) || defined(AMD64) 3070 if (s > 4*M || LargePageSizeInBytes > 4*M) { 3071 WARN("JVM cannot use large pages bigger than 4mb."); 3072 } else { 3073 #endif 3074 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 3075 _large_page_size = LargePageSizeInBytes; 3076 } else { 3077 _large_page_size = s; 3078 } 3079 success = true; 3080 #if defined(IA32) || defined(AMD64) 3081 } 3082 #endif 3083 } else { 3084 WARN("Large page is not supported by the processor."); 3085 } 3086 } else { 3087 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 3088 } 3089 #undef WARN 3090 3091 const size_t default_page_size = (size_t) vm_page_size(); 3092 if (success && _large_page_size > default_page_size) { 3093 _page_sizes[0] = _large_page_size; 3094 _page_sizes[1] = default_page_size; 3095 _page_sizes[2] = 0; 3096 } 3097 3098 cleanup_after_large_page_init(); 3099 UseLargePages = success; 3100 } 3101 3102 // On win32, one cannot release just a part of reserved memory, it's an 3103 // all or nothing deal. When we split a reservation, we must break the 3104 // reservation into two reservations. 3105 void os::pd_split_reserved_memory(char *base, size_t size, size_t split, 3106 bool realloc) { 3107 if (size > 0) { 3108 release_memory(base, size); 3109 if (realloc) { 3110 reserve_memory(split, base); 3111 } 3112 if (size != split) { 3113 reserve_memory(size - split, base + split); 3114 } 3115 } 3116 } 3117 3118 // Multiple threads can race in this code but it's not possible to unmap small sections of 3119 // virtual space to get requested alignment, like posix-like os's. 3120 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe. 3121 char* os::reserve_memory_aligned(size_t size, size_t alignment) { 3122 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 3123 "Alignment must be a multiple of allocation granularity (page size)"); 3124 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 3125 3126 size_t extra_size = size + alignment; 3127 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 3128 3129 char* aligned_base = NULL; 3130 3131 do { 3132 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 3133 if (extra_base == NULL) { 3134 return NULL; 3135 } 3136 // Do manual alignment 3137 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 3138 3139 os::release_memory(extra_base, extra_size); 3140 3141 aligned_base = os::reserve_memory(size, aligned_base); 3142 3143 } while (aligned_base == NULL); 3144 3145 return aligned_base; 3146 } 3147 3148 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 3149 assert((size_t)addr % os::vm_allocation_granularity() == 0, 3150 "reserve alignment"); 3151 assert(bytes % os::vm_page_size() == 0, "reserve page size"); 3152 char* res; 3153 // note that if UseLargePages is on, all the areas that require interleaving 3154 // will go thru reserve_memory_special rather than thru here. 3155 bool use_individual = (UseNUMAInterleaving && !UseLargePages); 3156 if (!use_individual) { 3157 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 3158 } else { 3159 elapsedTimer reserveTimer; 3160 if (Verbose && PrintMiscellaneous) reserveTimer.start(); 3161 // in numa interleaving, we have to allocate pages individually 3162 // (well really chunks of NUMAInterleaveGranularity size) 3163 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE); 3164 if (res == NULL) { 3165 warning("NUMA page allocation failed"); 3166 } 3167 if (Verbose && PrintMiscellaneous) { 3168 reserveTimer.stop(); 3169 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes, 3170 reserveTimer.milliseconds(), reserveTimer.ticks()); 3171 } 3172 } 3173 assert(res == NULL || addr == NULL || addr == res, 3174 "Unexpected address from reserve."); 3175 3176 return res; 3177 } 3178 3179 // Reserve memory at an arbitrary address, only if that area is 3180 // available (and not reserved for something else). 3181 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3182 // Windows os::reserve_memory() fails of the requested address range is 3183 // not avilable. 3184 return reserve_memory(bytes, requested_addr); 3185 } 3186 3187 size_t os::large_page_size() { 3188 return _large_page_size; 3189 } 3190 3191 bool os::can_commit_large_page_memory() { 3192 // Windows only uses large page memory when the entire region is reserved 3193 // and committed in a single VirtualAlloc() call. This may change in the 3194 // future, but with Windows 2003 it's not possible to commit on demand. 3195 return false; 3196 } 3197 3198 bool os::can_execute_large_page_memory() { 3199 return true; 3200 } 3201 3202 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, 3203 bool exec) { 3204 assert(UseLargePages, "only for large pages"); 3205 3206 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { 3207 return NULL; // Fallback to small pages. 3208 } 3209 3210 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 3211 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3212 3213 // with large pages, there are two cases where we need to use Individual Allocation 3214 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003) 3215 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page 3216 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) { 3217 log_debug(pagesize)("Reserving large pages individually."); 3218 3219 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError); 3220 if (p_buf == NULL) { 3221 // give an appropriate warning message 3222 if (UseNUMAInterleaving) { 3223 warning("NUMA large page allocation failed, UseLargePages flag ignored"); 3224 } 3225 if (UseLargePagesIndividualAllocation) { 3226 warning("Individually allocated large pages failed, " 3227 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 3228 } 3229 return NULL; 3230 } 3231 3232 return p_buf; 3233 3234 } else { 3235 log_debug(pagesize)("Reserving large pages in a single large chunk."); 3236 3237 // normal policy just allocate it all at once 3238 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3239 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); 3240 if (res != NULL) { 3241 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC); 3242 } 3243 3244 return res; 3245 } 3246 } 3247 3248 bool os::release_memory_special(char* base, size_t bytes) { 3249 assert(base != NULL, "Sanity check"); 3250 return release_memory(base, bytes); 3251 } 3252 3253 void os::print_statistics() { 3254 } 3255 3256 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) { 3257 int err = os::get_last_error(); 3258 char buf[256]; 3259 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3260 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 3261 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3262 exec, buf_len != 0 ? buf : "<no_error_string>", err); 3263 } 3264 3265 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 3266 if (bytes == 0) { 3267 // Don't bother the OS with noops. 3268 return true; 3269 } 3270 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 3271 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 3272 // Don't attempt to print anything if the OS call fails. We're 3273 // probably low on resources, so the print itself may cause crashes. 3274 3275 // unless we have NUMAInterleaving enabled, the range of a commit 3276 // is always within a reserve covered by a single VirtualAlloc 3277 // in that case we can just do a single commit for the requested size 3278 if (!UseNUMAInterleaving) { 3279 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) { 3280 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3281 return false; 3282 } 3283 if (exec) { 3284 DWORD oldprot; 3285 // Windows doc says to use VirtualProtect to get execute permissions 3286 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) { 3287 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3288 return false; 3289 } 3290 } 3291 return true; 3292 } else { 3293 3294 // when NUMAInterleaving is enabled, the commit might cover a range that 3295 // came from multiple VirtualAlloc reserves (using allocate_pages_individually). 3296 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery 3297 // returns represents the number of bytes that can be committed in one step. 3298 size_t bytes_remaining = bytes; 3299 char * next_alloc_addr = addr; 3300 while (bytes_remaining > 0) { 3301 MEMORY_BASIC_INFORMATION alloc_info; 3302 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info)); 3303 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3304 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, 3305 PAGE_READWRITE) == NULL) { 3306 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3307 exec);) 3308 return false; 3309 } 3310 if (exec) { 3311 DWORD oldprot; 3312 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, 3313 PAGE_EXECUTE_READWRITE, &oldprot)) { 3314 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3315 exec);) 3316 return false; 3317 } 3318 } 3319 bytes_remaining -= bytes_to_rq; 3320 next_alloc_addr += bytes_to_rq; 3321 } 3322 } 3323 // if we made it this far, return true 3324 return true; 3325 } 3326 3327 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 3328 bool exec) { 3329 // alignment_hint is ignored on this OS 3330 return pd_commit_memory(addr, size, exec); 3331 } 3332 3333 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 3334 const char* mesg) { 3335 assert(mesg != NULL, "mesg must be specified"); 3336 if (!pd_commit_memory(addr, size, exec)) { 3337 warn_fail_commit_memory(addr, size, exec); 3338 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 3339 } 3340 } 3341 3342 void os::pd_commit_memory_or_exit(char* addr, size_t size, 3343 size_t alignment_hint, bool exec, 3344 const char* mesg) { 3345 // alignment_hint is ignored on this OS 3346 pd_commit_memory_or_exit(addr, size, exec, mesg); 3347 } 3348 3349 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3350 if (bytes == 0) { 3351 // Don't bother the OS with noops. 3352 return true; 3353 } 3354 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 3355 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 3356 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0); 3357 } 3358 3359 bool os::pd_release_memory(char* addr, size_t bytes) { 3360 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 3361 } 3362 3363 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 3364 return os::commit_memory(addr, size, !ExecMem); 3365 } 3366 3367 bool os::remove_stack_guard_pages(char* addr, size_t size) { 3368 return os::uncommit_memory(addr, size); 3369 } 3370 3371 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) { 3372 uint count = 0; 3373 bool ret = false; 3374 size_t bytes_remaining = bytes; 3375 char * next_protect_addr = addr; 3376 3377 // Use VirtualQuery() to get the chunk size. 3378 while (bytes_remaining) { 3379 MEMORY_BASIC_INFORMATION alloc_info; 3380 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) { 3381 return false; 3382 } 3383 3384 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3385 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving, 3386 // but we don't distinguish here as both cases are protected by same API. 3387 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0; 3388 warning("Failed protecting pages individually for chunk #%u", count); 3389 if (!ret) { 3390 return false; 3391 } 3392 3393 bytes_remaining -= bytes_to_protect; 3394 next_protect_addr += bytes_to_protect; 3395 count++; 3396 } 3397 return ret; 3398 } 3399 3400 // Set protections specified 3401 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3402 bool is_committed) { 3403 unsigned int p = 0; 3404 switch (prot) { 3405 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 3406 case MEM_PROT_READ: p = PAGE_READONLY; break; 3407 case MEM_PROT_RW: p = PAGE_READWRITE; break; 3408 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 3409 default: 3410 ShouldNotReachHere(); 3411 } 3412 3413 DWORD old_status; 3414 3415 // Strange enough, but on Win32 one can change protection only for committed 3416 // memory, not a big deal anyway, as bytes less or equal than 64K 3417 if (!is_committed) { 3418 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX, 3419 "cannot commit protection page"); 3420 } 3421 // One cannot use os::guard_memory() here, as on Win32 guard page 3422 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 3423 // 3424 // Pages in the region become guard pages. Any attempt to access a guard page 3425 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 3426 // the guard page status. Guard pages thus act as a one-time access alarm. 3427 bool ret; 3428 if (UseNUMAInterleaving) { 3429 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time, 3430 // so we must protect the chunks individually. 3431 ret = protect_pages_individually(addr, bytes, p, &old_status); 3432 } else { 3433 ret = VirtualProtect(addr, bytes, p, &old_status) != 0; 3434 } 3435 #ifdef ASSERT 3436 if (!ret) { 3437 int err = os::get_last_error(); 3438 char buf[256]; 3439 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3440 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT 3441 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3442 buf_len != 0 ? buf : "<no_error_string>", err); 3443 } 3444 #endif 3445 return ret; 3446 } 3447 3448 bool os::guard_memory(char* addr, size_t bytes) { 3449 DWORD old_status; 3450 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 3451 } 3452 3453 bool os::unguard_memory(char* addr, size_t bytes) { 3454 DWORD old_status; 3455 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 3456 } 3457 3458 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3459 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3460 void os::numa_make_global(char *addr, size_t bytes) { } 3461 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 3462 bool os::numa_topology_changed() { return false; } 3463 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); } 3464 int os::numa_get_group_id() { return 0; } 3465 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 3466 if (numa_node_list_holder.get_count() == 0 && size > 0) { 3467 // Provide an answer for UMA systems 3468 ids[0] = 0; 3469 return 1; 3470 } else { 3471 // check for size bigger than actual groups_num 3472 size = MIN2(size, numa_get_groups_num()); 3473 for (int i = 0; i < (int)size; i++) { 3474 ids[i] = numa_node_list_holder.get_node_list_entry(i); 3475 } 3476 return size; 3477 } 3478 } 3479 3480 bool os::get_page_info(char *start, page_info* info) { 3481 return false; 3482 } 3483 3484 char *os::scan_pages(char *start, char* end, page_info* page_expected, 3485 page_info* page_found) { 3486 return end; 3487 } 3488 3489 char* os::non_memory_address_word() { 3490 // Must never look like an address returned by reserve_memory, 3491 // even in its subfields (as defined by the CPU immediate fields, 3492 // if the CPU splits constants across multiple instructions). 3493 return (char*)-1; 3494 } 3495 3496 #define MAX_ERROR_COUNT 100 3497 #define SYS_THREAD_ERROR 0xffffffffUL 3498 3499 void os::pd_start_thread(Thread* thread) { 3500 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 3501 // Returns previous suspend state: 3502 // 0: Thread was not suspended 3503 // 1: Thread is running now 3504 // >1: Thread is still suspended. 3505 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3506 } 3507 3508 class HighResolutionInterval : public CHeapObj<mtThread> { 3509 // The default timer resolution seems to be 10 milliseconds. 3510 // (Where is this written down?) 3511 // If someone wants to sleep for only a fraction of the default, 3512 // then we set the timer resolution down to 1 millisecond for 3513 // the duration of their interval. 3514 // We carefully set the resolution back, since otherwise we 3515 // seem to incur an overhead (3%?) that we don't need. 3516 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 3517 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 3518 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 3519 // timeBeginPeriod() if the relative error exceeded some threshold. 3520 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 3521 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 3522 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 3523 // resolution timers running. 3524 private: 3525 jlong resolution; 3526 public: 3527 HighResolutionInterval(jlong ms) { 3528 resolution = ms % 10L; 3529 if (resolution != 0) { 3530 MMRESULT result = timeBeginPeriod(1L); 3531 } 3532 } 3533 ~HighResolutionInterval() { 3534 if (resolution != 0) { 3535 MMRESULT result = timeEndPeriod(1L); 3536 } 3537 resolution = 0L; 3538 } 3539 }; 3540 3541 int os::sleep(Thread* thread, jlong ms, bool interruptable) { 3542 jlong limit = (jlong) MAXDWORD; 3543 3544 while (ms > limit) { 3545 int res; 3546 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) { 3547 return res; 3548 } 3549 ms -= limit; 3550 } 3551 3552 assert(thread == Thread::current(), "thread consistency check"); 3553 OSThread* osthread = thread->osthread(); 3554 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 3555 int result; 3556 if (interruptable) { 3557 assert(thread->is_Java_thread(), "must be java thread"); 3558 JavaThread *jt = (JavaThread *) thread; 3559 ThreadBlockInVM tbivm(jt); 3560 3561 jt->set_suspend_equivalent(); 3562 // cleared by handle_special_suspend_equivalent_condition() or 3563 // java_suspend_self() via check_and_wait_while_suspended() 3564 3565 HANDLE events[1]; 3566 events[0] = osthread->interrupt_event(); 3567 HighResolutionInterval *phri=NULL; 3568 if (!ForceTimeHighResolution) { 3569 phri = new HighResolutionInterval(ms); 3570 } 3571 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 3572 result = OS_TIMEOUT; 3573 } else { 3574 ResetEvent(osthread->interrupt_event()); 3575 osthread->set_interrupted(false); 3576 result = OS_INTRPT; 3577 } 3578 delete phri; //if it is NULL, harmless 3579 3580 // were we externally suspended while we were waiting? 3581 jt->check_and_wait_while_suspended(); 3582 } else { 3583 assert(!thread->is_Java_thread(), "must not be java thread"); 3584 Sleep((long) ms); 3585 result = OS_TIMEOUT; 3586 } 3587 return result; 3588 } 3589 3590 // Short sleep, direct OS call. 3591 // 3592 // ms = 0, means allow others (if any) to run. 3593 // 3594 void os::naked_short_sleep(jlong ms) { 3595 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3596 Sleep(ms); 3597 } 3598 3599 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3600 void os::infinite_sleep() { 3601 while (true) { // sleep forever ... 3602 Sleep(100000); // ... 100 seconds at a time 3603 } 3604 } 3605 3606 typedef BOOL (WINAPI * STTSignature)(void); 3607 3608 void os::naked_yield() { 3609 // Consider passing back the return value from SwitchToThread(). 3610 SwitchToThread(); 3611 } 3612 3613 // Win32 only gives you access to seven real priorities at a time, 3614 // so we compress Java's ten down to seven. It would be better 3615 // if we dynamically adjusted relative priorities. 3616 3617 int os::java_to_os_priority[CriticalPriority + 1] = { 3618 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3619 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3620 THREAD_PRIORITY_LOWEST, // 2 3621 THREAD_PRIORITY_BELOW_NORMAL, // 3 3622 THREAD_PRIORITY_BELOW_NORMAL, // 4 3623 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3624 THREAD_PRIORITY_NORMAL, // 6 3625 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3626 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3627 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3628 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority 3629 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority 3630 }; 3631 3632 int prio_policy1[CriticalPriority + 1] = { 3633 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3634 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3635 THREAD_PRIORITY_LOWEST, // 2 3636 THREAD_PRIORITY_BELOW_NORMAL, // 3 3637 THREAD_PRIORITY_BELOW_NORMAL, // 4 3638 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3639 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3640 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3641 THREAD_PRIORITY_HIGHEST, // 8 3642 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3643 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority 3644 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority 3645 }; 3646 3647 static int prio_init() { 3648 // If ThreadPriorityPolicy is 1, switch tables 3649 if (ThreadPriorityPolicy == 1) { 3650 int i; 3651 for (i = 0; i < CriticalPriority + 1; i++) { 3652 os::java_to_os_priority[i] = prio_policy1[i]; 3653 } 3654 } 3655 if (UseCriticalJavaThreadPriority) { 3656 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 3657 } 3658 return 0; 3659 } 3660 3661 OSReturn os::set_native_priority(Thread* thread, int priority) { 3662 if (!UseThreadPriorities) return OS_OK; 3663 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3664 return ret ? OS_OK : OS_ERR; 3665 } 3666 3667 OSReturn os::get_native_priority(const Thread* const thread, 3668 int* priority_ptr) { 3669 if (!UseThreadPriorities) { 3670 *priority_ptr = java_to_os_priority[NormPriority]; 3671 return OS_OK; 3672 } 3673 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3674 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3675 assert(false, "GetThreadPriority failed"); 3676 return OS_ERR; 3677 } 3678 *priority_ptr = os_prio; 3679 return OS_OK; 3680 } 3681 3682 3683 // Hint to the underlying OS that a task switch would not be good. 3684 // Void return because it's a hint and can fail. 3685 void os::hint_no_preempt() {} 3686 3687 void os::interrupt(Thread* thread) { 3688 assert(!thread->is_Java_thread() || Thread::current() == thread || 3689 Threads_lock->owned_by_self(), 3690 "possibility of dangling Thread pointer"); 3691 3692 OSThread* osthread = thread->osthread(); 3693 osthread->set_interrupted(true); 3694 // More than one thread can get here with the same value of osthread, 3695 // resulting in multiple notifications. We do, however, want the store 3696 // to interrupted() to be visible to other threads before we post 3697 // the interrupt event. 3698 OrderAccess::release(); 3699 SetEvent(osthread->interrupt_event()); 3700 // For JSR166: unpark after setting status 3701 if (thread->is_Java_thread()) { 3702 ((JavaThread*)thread)->parker()->unpark(); 3703 } 3704 3705 ParkEvent * ev = thread->_ParkEvent; 3706 if (ev != NULL) ev->unpark(); 3707 } 3708 3709 3710 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3711 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3712 "possibility of dangling Thread pointer"); 3713 3714 OSThread* osthread = thread->osthread(); 3715 // There is no synchronization between the setting of the interrupt 3716 // and it being cleared here. It is critical - see 6535709 - that 3717 // we only clear the interrupt state, and reset the interrupt event, 3718 // if we are going to report that we were indeed interrupted - else 3719 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups 3720 // depending on the timing. By checking thread interrupt event to see 3721 // if the thread gets real interrupt thus prevent spurious wakeup. 3722 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0); 3723 if (interrupted && clear_interrupted) { 3724 osthread->set_interrupted(false); 3725 ResetEvent(osthread->interrupt_event()); 3726 } // Otherwise leave the interrupted state alone 3727 3728 return interrupted; 3729 } 3730 3731 // Get's a pc (hint) for a running thread. Currently used only for profiling. 3732 ExtendedPC os::get_thread_pc(Thread* thread) { 3733 CONTEXT context; 3734 context.ContextFlags = CONTEXT_CONTROL; 3735 HANDLE handle = thread->osthread()->thread_handle(); 3736 #ifdef _M_IA64 3737 assert(0, "Fix get_thread_pc"); 3738 return ExtendedPC(NULL); 3739 #else 3740 if (GetThreadContext(handle, &context)) { 3741 #ifdef _M_AMD64 3742 return ExtendedPC((address) context.Rip); 3743 #else 3744 return ExtendedPC((address) context.Eip); 3745 #endif 3746 } else { 3747 return ExtendedPC(NULL); 3748 } 3749 #endif 3750 } 3751 3752 // GetCurrentThreadId() returns DWORD 3753 intx os::current_thread_id() { return GetCurrentThreadId(); } 3754 3755 static int _initial_pid = 0; 3756 3757 int os::current_process_id() { 3758 return (_initial_pid ? _initial_pid : _getpid()); 3759 } 3760 3761 int os::win32::_vm_page_size = 0; 3762 int os::win32::_vm_allocation_granularity = 0; 3763 int os::win32::_processor_type = 0; 3764 // Processor level is not available on non-NT systems, use vm_version instead 3765 int os::win32::_processor_level = 0; 3766 julong os::win32::_physical_memory = 0; 3767 size_t os::win32::_default_stack_size = 0; 3768 3769 intx os::win32::_os_thread_limit = 0; 3770 volatile intx os::win32::_os_thread_count = 0; 3771 3772 bool os::win32::_is_windows_server = false; 3773 3774 // 6573254 3775 // Currently, the bug is observed across all the supported Windows releases, 3776 // including the latest one (as of this writing - Windows Server 2012 R2) 3777 bool os::win32::_has_exit_bug = true; 3778 3779 void os::win32::initialize_system_info() { 3780 SYSTEM_INFO si; 3781 GetSystemInfo(&si); 3782 _vm_page_size = si.dwPageSize; 3783 _vm_allocation_granularity = si.dwAllocationGranularity; 3784 _processor_type = si.dwProcessorType; 3785 _processor_level = si.wProcessorLevel; 3786 set_processor_count(si.dwNumberOfProcessors); 3787 3788 MEMORYSTATUSEX ms; 3789 ms.dwLength = sizeof(ms); 3790 3791 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3792 // dwMemoryLoad (% of memory in use) 3793 GlobalMemoryStatusEx(&ms); 3794 _physical_memory = ms.ullTotalPhys; 3795 3796 OSVERSIONINFOEX oi; 3797 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 3798 GetVersionEx((OSVERSIONINFO*)&oi); 3799 switch (oi.dwPlatformId) { 3800 case VER_PLATFORM_WIN32_NT: 3801 { 3802 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3803 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER || 3804 oi.wProductType == VER_NT_SERVER) { 3805 _is_windows_server = true; 3806 } 3807 } 3808 break; 3809 default: fatal("Unknown platform"); 3810 } 3811 3812 _default_stack_size = os::current_stack_size(); 3813 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3814 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3815 "stack size not a multiple of page size"); 3816 3817 initialize_performance_counter(); 3818 } 3819 3820 3821 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, 3822 int ebuflen) { 3823 char path[MAX_PATH]; 3824 DWORD size; 3825 DWORD pathLen = (DWORD)sizeof(path); 3826 HINSTANCE result = NULL; 3827 3828 // only allow library name without path component 3829 assert(strchr(name, '\\') == NULL, "path not allowed"); 3830 assert(strchr(name, ':') == NULL, "path not allowed"); 3831 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) { 3832 jio_snprintf(ebuf, ebuflen, 3833 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name); 3834 return NULL; 3835 } 3836 3837 // search system directory 3838 if ((size = GetSystemDirectory(path, pathLen)) > 0) { 3839 if (size >= pathLen) { 3840 return NULL; // truncated 3841 } 3842 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3843 return NULL; // truncated 3844 } 3845 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3846 return result; 3847 } 3848 } 3849 3850 // try Windows directory 3851 if ((size = GetWindowsDirectory(path, pathLen)) > 0) { 3852 if (size >= pathLen) { 3853 return NULL; // truncated 3854 } 3855 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3856 return NULL; // truncated 3857 } 3858 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3859 return result; 3860 } 3861 } 3862 3863 jio_snprintf(ebuf, ebuflen, 3864 "os::win32::load_windows_dll() cannot load %s from system directories.", name); 3865 return NULL; 3866 } 3867 3868 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS) 3869 #define EXIT_TIMEOUT 300000 /* 5 minutes */ 3870 3871 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) { 3872 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect); 3873 return TRUE; 3874 } 3875 3876 int os::win32::exit_process_or_thread(Ept what, int exit_code) { 3877 // Basic approach: 3878 // - Each exiting thread registers its intent to exit and then does so. 3879 // - A thread trying to terminate the process must wait for all 3880 // threads currently exiting to complete their exit. 3881 3882 if (os::win32::has_exit_bug()) { 3883 // The array holds handles of the threads that have started exiting by calling 3884 // _endthreadex(). 3885 // Should be large enough to avoid blocking the exiting thread due to lack of 3886 // a free slot. 3887 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP]; 3888 static int handle_count = 0; 3889 3890 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT; 3891 static CRITICAL_SECTION crit_sect; 3892 static volatile jint process_exiting = 0; 3893 int i, j; 3894 DWORD res; 3895 HANDLE hproc, hthr; 3896 3897 // We only attempt to register threads until a process exiting 3898 // thread manages to set the process_exiting flag. Any threads 3899 // that come through here after the process_exiting flag is set 3900 // are unregistered and will be caught in the SuspendThread() 3901 // infinite loop below. 3902 bool registered = false; 3903 3904 // The first thread that reached this point, initializes the critical section. 3905 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) { 3906 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__); 3907 } else if (OrderAccess::load_acquire(&process_exiting) == 0) { 3908 if (what != EPT_THREAD) { 3909 // Atomically set process_exiting before the critical section 3910 // to increase the visibility between racing threads. 3911 Atomic::cmpxchg((jint)GetCurrentThreadId(), &process_exiting, 0); 3912 } 3913 EnterCriticalSection(&crit_sect); 3914 3915 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) { 3916 // Remove from the array those handles of the threads that have completed exiting. 3917 for (i = 0, j = 0; i < handle_count; ++i) { 3918 res = WaitForSingleObject(handles[i], 0 /* don't wait */); 3919 if (res == WAIT_TIMEOUT) { 3920 handles[j++] = handles[i]; 3921 } else { 3922 if (res == WAIT_FAILED) { 3923 warning("WaitForSingleObject failed (%u) in %s: %d\n", 3924 GetLastError(), __FILE__, __LINE__); 3925 } 3926 // Don't keep the handle, if we failed waiting for it. 3927 CloseHandle(handles[i]); 3928 } 3929 } 3930 3931 // If there's no free slot in the array of the kept handles, we'll have to 3932 // wait until at least one thread completes exiting. 3933 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) { 3934 // Raise the priority of the oldest exiting thread to increase its chances 3935 // to complete sooner. 3936 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL); 3937 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT); 3938 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) { 3939 i = (res - WAIT_OBJECT_0); 3940 handle_count = MAXIMUM_THREADS_TO_KEEP - 1; 3941 for (; i < handle_count; ++i) { 3942 handles[i] = handles[i + 1]; 3943 } 3944 } else { 3945 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3946 (res == WAIT_FAILED ? "failed" : "timed out"), 3947 GetLastError(), __FILE__, __LINE__); 3948 // Don't keep handles, if we failed waiting for them. 3949 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) { 3950 CloseHandle(handles[i]); 3951 } 3952 handle_count = 0; 3953 } 3954 } 3955 3956 // Store a duplicate of the current thread handle in the array of handles. 3957 hproc = GetCurrentProcess(); 3958 hthr = GetCurrentThread(); 3959 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count], 3960 0, FALSE, DUPLICATE_SAME_ACCESS)) { 3961 warning("DuplicateHandle failed (%u) in %s: %d\n", 3962 GetLastError(), __FILE__, __LINE__); 3963 3964 // We can't register this thread (no more handles) so this thread 3965 // may be racing with a thread that is calling exit(). If the thread 3966 // that is calling exit() has managed to set the process_exiting 3967 // flag, then this thread will be caught in the SuspendThread() 3968 // infinite loop below which closes that race. A small timing 3969 // window remains before the process_exiting flag is set, but it 3970 // is only exposed when we are out of handles. 3971 } else { 3972 ++handle_count; 3973 registered = true; 3974 3975 // The current exiting thread has stored its handle in the array, and now 3976 // should leave the critical section before calling _endthreadex(). 3977 } 3978 3979 } else if (what != EPT_THREAD && handle_count > 0) { 3980 jlong start_time, finish_time, timeout_left; 3981 // Before ending the process, make sure all the threads that had called 3982 // _endthreadex() completed. 3983 3984 // Set the priority level of the current thread to the same value as 3985 // the priority level of exiting threads. 3986 // This is to ensure it will be given a fair chance to execute if 3987 // the timeout expires. 3988 hthr = GetCurrentThread(); 3989 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL); 3990 start_time = os::javaTimeNanos(); 3991 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L); 3992 for (i = 0; ; ) { 3993 int portion_count = handle_count - i; 3994 if (portion_count > MAXIMUM_WAIT_OBJECTS) { 3995 portion_count = MAXIMUM_WAIT_OBJECTS; 3996 } 3997 for (j = 0; j < portion_count; ++j) { 3998 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL); 3999 } 4000 timeout_left = (finish_time - start_time) / 1000000L; 4001 if (timeout_left < 0) { 4002 timeout_left = 0; 4003 } 4004 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left); 4005 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) { 4006 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 4007 (res == WAIT_FAILED ? "failed" : "timed out"), 4008 GetLastError(), __FILE__, __LINE__); 4009 // Reset portion_count so we close the remaining 4010 // handles due to this error. 4011 portion_count = handle_count - i; 4012 } 4013 for (j = 0; j < portion_count; ++j) { 4014 CloseHandle(handles[i + j]); 4015 } 4016 if ((i += portion_count) >= handle_count) { 4017 break; 4018 } 4019 start_time = os::javaTimeNanos(); 4020 } 4021 handle_count = 0; 4022 } 4023 4024 LeaveCriticalSection(&crit_sect); 4025 } 4026 4027 if (!registered && 4028 OrderAccess::load_acquire(&process_exiting) != 0 && 4029 process_exiting != (jint)GetCurrentThreadId()) { 4030 // Some other thread is about to call exit(), so we don't let 4031 // the current unregistered thread proceed to exit() or _endthreadex() 4032 while (true) { 4033 SuspendThread(GetCurrentThread()); 4034 // Avoid busy-wait loop, if SuspendThread() failed. 4035 Sleep(EXIT_TIMEOUT); 4036 } 4037 } 4038 } 4039 4040 // We are here if either 4041 // - there's no 'race at exit' bug on this OS release; 4042 // - initialization of the critical section failed (unlikely); 4043 // - the current thread has registered itself and left the critical section; 4044 // - the process-exiting thread has raised the flag and left the critical section. 4045 if (what == EPT_THREAD) { 4046 _endthreadex((unsigned)exit_code); 4047 } else if (what == EPT_PROCESS) { 4048 ::exit(exit_code); 4049 } else { 4050 _exit(exit_code); 4051 } 4052 4053 // Should not reach here 4054 return exit_code; 4055 } 4056 4057 #undef EXIT_TIMEOUT 4058 4059 void os::win32::setmode_streams() { 4060 _setmode(_fileno(stdin), _O_BINARY); 4061 _setmode(_fileno(stdout), _O_BINARY); 4062 _setmode(_fileno(stderr), _O_BINARY); 4063 } 4064 4065 4066 bool os::is_debugger_attached() { 4067 return IsDebuggerPresent() ? true : false; 4068 } 4069 4070 4071 void os::wait_for_keypress_at_exit(void) { 4072 if (PauseAtExit) { 4073 fprintf(stderr, "Press any key to continue...\n"); 4074 fgetc(stdin); 4075 } 4076 } 4077 4078 4079 bool os::message_box(const char* title, const char* message) { 4080 int result = MessageBox(NULL, message, title, 4081 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 4082 return result == IDYES; 4083 } 4084 4085 #ifndef PRODUCT 4086 #ifndef _WIN64 4087 // Helpers to check whether NX protection is enabled 4088 int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 4089 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 4090 pex->ExceptionRecord->NumberParameters > 0 && 4091 pex->ExceptionRecord->ExceptionInformation[0] == 4092 EXCEPTION_INFO_EXEC_VIOLATION) { 4093 return EXCEPTION_EXECUTE_HANDLER; 4094 } 4095 return EXCEPTION_CONTINUE_SEARCH; 4096 } 4097 4098 void nx_check_protection() { 4099 // If NX is enabled we'll get an exception calling into code on the stack 4100 char code[] = { (char)0xC3 }; // ret 4101 void *code_ptr = (void *)code; 4102 __try { 4103 __asm call code_ptr 4104 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 4105 tty->print_raw_cr("NX protection detected."); 4106 } 4107 } 4108 #endif // _WIN64 4109 #endif // PRODUCT 4110 4111 // This is called _before_ the global arguments have been parsed 4112 void os::init(void) { 4113 _initial_pid = _getpid(); 4114 4115 init_random(1234567); 4116 4117 win32::initialize_system_info(); 4118 win32::setmode_streams(); 4119 init_page_sizes((size_t) win32::vm_page_size()); 4120 4121 // This may be overridden later when argument processing is done. 4122 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, false); 4123 4124 // Initialize main_process and main_thread 4125 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 4126 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 4127 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 4128 fatal("DuplicateHandle failed\n"); 4129 } 4130 main_thread_id = (int) GetCurrentThreadId(); 4131 4132 // initialize fast thread access - only used for 32-bit 4133 win32::initialize_thread_ptr_offset(); 4134 } 4135 4136 // To install functions for atexit processing 4137 extern "C" { 4138 static void perfMemory_exit_helper() { 4139 perfMemory_exit(); 4140 } 4141 } 4142 4143 static jint initSock(); 4144 4145 // this is called _after_ the global arguments have been parsed 4146 jint os::init_2(void) { 4147 // Allocate a single page and mark it as readable for safepoint polling 4148 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 4149 guarantee(polling_page != NULL, "Reserve Failed for polling page"); 4150 4151 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 4152 guarantee(return_page != NULL, "Commit Failed for polling page"); 4153 4154 os::set_polling_page(polling_page); 4155 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page)); 4156 4157 if (!UseMembar) { 4158 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE); 4159 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 4160 4161 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE); 4162 guarantee(return_page != NULL, "Commit Failed for memory serialize page"); 4163 4164 os::set_memory_serialize_page(mem_serialize_page); 4165 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page)); 4166 } 4167 4168 // Setup Windows Exceptions 4169 4170 // for debugging float code generation bugs 4171 if (ForceFloatExceptions) { 4172 #ifndef _WIN64 4173 static long fp_control_word = 0; 4174 __asm { fstcw fp_control_word } 4175 // see Intel PPro Manual, Vol. 2, p 7-16 4176 const long precision = 0x20; 4177 const long underflow = 0x10; 4178 const long overflow = 0x08; 4179 const long zero_div = 0x04; 4180 const long denorm = 0x02; 4181 const long invalid = 0x01; 4182 fp_control_word |= invalid; 4183 __asm { fldcw fp_control_word } 4184 #endif 4185 } 4186 4187 // If stack_commit_size is 0, windows will reserve the default size, 4188 // but only commit a small portion of it. 4189 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 4190 size_t default_reserve_size = os::win32::default_stack_size(); 4191 size_t actual_reserve_size = stack_commit_size; 4192 if (stack_commit_size < default_reserve_size) { 4193 // If stack_commit_size == 0, we want this too 4194 actual_reserve_size = default_reserve_size; 4195 } 4196 4197 // Check minimum allowable stack size for thread creation and to initialize 4198 // the java system classes, including StackOverflowError - depends on page 4199 // size. Add two 4K pages for compiler2 recursion in main thread. 4200 // Add in 4*BytesPerWord 4K pages to account for VM stack during 4201 // class initialization depending on 32 or 64 bit VM. 4202 size_t min_stack_allowed = 4203 (size_t)(JavaThread::stack_guard_zone_size() + 4204 JavaThread::stack_shadow_zone_size() + 4205 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K); 4206 4207 min_stack_allowed = align_size_up(min_stack_allowed, os::vm_page_size()); 4208 4209 if (actual_reserve_size < min_stack_allowed) { 4210 tty->print_cr("\nThe Java thread stack size specified is too small. " 4211 "Specify at least %dk", 4212 min_stack_allowed / K); 4213 return JNI_ERR; 4214 } 4215 4216 JavaThread::set_stack_size_at_create(stack_commit_size); 4217 4218 // Calculate theoretical max. size of Threads to guard gainst artifical 4219 // out-of-memory situations, where all available address-space has been 4220 // reserved by thread stacks. 4221 assert(actual_reserve_size != 0, "Must have a stack"); 4222 4223 // Calculate the thread limit when we should start doing Virtual Memory 4224 // banging. Currently when the threads will have used all but 200Mb of space. 4225 // 4226 // TODO: consider performing a similar calculation for commit size instead 4227 // as reserve size, since on a 64-bit platform we'll run into that more 4228 // often than running out of virtual memory space. We can use the 4229 // lower value of the two calculations as the os_thread_limit. 4230 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 4231 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 4232 4233 // at exit methods are called in the reverse order of their registration. 4234 // there is no limit to the number of functions registered. atexit does 4235 // not set errno. 4236 4237 if (PerfAllowAtExitRegistration) { 4238 // only register atexit functions if PerfAllowAtExitRegistration is set. 4239 // atexit functions can be delayed until process exit time, which 4240 // can be problematic for embedded VM situations. Embedded VMs should 4241 // call DestroyJavaVM() to assure that VM resources are released. 4242 4243 // note: perfMemory_exit_helper atexit function may be removed in 4244 // the future if the appropriate cleanup code can be added to the 4245 // VM_Exit VMOperation's doit method. 4246 if (atexit(perfMemory_exit_helper) != 0) { 4247 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 4248 } 4249 } 4250 4251 #ifndef _WIN64 4252 // Print something if NX is enabled (win32 on AMD64) 4253 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 4254 #endif 4255 4256 // initialize thread priority policy 4257 prio_init(); 4258 4259 if (UseNUMA && !ForceNUMA) { 4260 UseNUMA = false; // We don't fully support this yet 4261 } 4262 4263 if (UseNUMAInterleaving) { 4264 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag 4265 bool success = numa_interleaving_init(); 4266 if (!success) UseNUMAInterleaving = false; 4267 } 4268 4269 if (initSock() != JNI_OK) { 4270 return JNI_ERR; 4271 } 4272 4273 return JNI_OK; 4274 } 4275 4276 // Mark the polling page as unreadable 4277 void os::make_polling_page_unreadable(void) { 4278 DWORD old_status; 4279 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4280 PAGE_NOACCESS, &old_status)) { 4281 fatal("Could not disable polling page"); 4282 } 4283 } 4284 4285 // Mark the polling page as readable 4286 void os::make_polling_page_readable(void) { 4287 DWORD old_status; 4288 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4289 PAGE_READONLY, &old_status)) { 4290 fatal("Could not enable polling page"); 4291 } 4292 } 4293 4294 4295 int os::stat(const char *path, struct stat *sbuf) { 4296 char pathbuf[MAX_PATH]; 4297 if (strlen(path) > MAX_PATH - 1) { 4298 errno = ENAMETOOLONG; 4299 return -1; 4300 } 4301 os::native_path(strcpy(pathbuf, path)); 4302 int ret = ::stat(pathbuf, sbuf); 4303 if (sbuf != NULL && UseUTCFileTimestamp) { 4304 // Fix for 6539723. st_mtime returned from stat() is dependent on 4305 // the system timezone and so can return different values for the 4306 // same file if/when daylight savings time changes. This adjustment 4307 // makes sure the same timestamp is returned regardless of the TZ. 4308 // 4309 // See: 4310 // http://msdn.microsoft.com/library/ 4311 // default.asp?url=/library/en-us/sysinfo/base/ 4312 // time_zone_information_str.asp 4313 // and 4314 // http://msdn.microsoft.com/library/default.asp?url= 4315 // /library/en-us/sysinfo/base/settimezoneinformation.asp 4316 // 4317 // NOTE: there is a insidious bug here: If the timezone is changed 4318 // after the call to stat() but before 'GetTimeZoneInformation()', then 4319 // the adjustment we do here will be wrong and we'll return the wrong 4320 // value (which will likely end up creating an invalid class data 4321 // archive). Absent a better API for this, or some time zone locking 4322 // mechanism, we'll have to live with this risk. 4323 TIME_ZONE_INFORMATION tz; 4324 DWORD tzid = GetTimeZoneInformation(&tz); 4325 int daylightBias = 4326 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 4327 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 4328 } 4329 return ret; 4330 } 4331 4332 4333 #define FT2INT64(ft) \ 4334 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 4335 4336 4337 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4338 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4339 // of a thread. 4340 // 4341 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4342 // the fast estimate available on the platform. 4343 4344 // current_thread_cpu_time() is not optimized for Windows yet 4345 jlong os::current_thread_cpu_time() { 4346 // return user + sys since the cost is the same 4347 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 4348 } 4349 4350 jlong os::thread_cpu_time(Thread* thread) { 4351 // consistent with what current_thread_cpu_time() returns. 4352 return os::thread_cpu_time(thread, true /* user+sys */); 4353 } 4354 4355 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4356 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4357 } 4358 4359 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 4360 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 4361 // If this function changes, os::is_thread_cpu_time_supported() should too 4362 FILETIME CreationTime; 4363 FILETIME ExitTime; 4364 FILETIME KernelTime; 4365 FILETIME UserTime; 4366 4367 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime, 4368 &ExitTime, &KernelTime, &UserTime) == 0) { 4369 return -1; 4370 } else if (user_sys_cpu_time) { 4371 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 4372 } else { 4373 return FT2INT64(UserTime) * 100; 4374 } 4375 } 4376 4377 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4378 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4379 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4380 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4381 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4382 } 4383 4384 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4385 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4386 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4387 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4388 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4389 } 4390 4391 bool os::is_thread_cpu_time_supported() { 4392 // see os::thread_cpu_time 4393 FILETIME CreationTime; 4394 FILETIME ExitTime; 4395 FILETIME KernelTime; 4396 FILETIME UserTime; 4397 4398 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime, 4399 &KernelTime, &UserTime) == 0) { 4400 return false; 4401 } else { 4402 return true; 4403 } 4404 } 4405 4406 // Windows does't provide a loadavg primitive so this is stubbed out for now. 4407 // It does have primitives (PDH API) to get CPU usage and run queue length. 4408 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 4409 // If we wanted to implement loadavg on Windows, we have a few options: 4410 // 4411 // a) Query CPU usage and run queue length and "fake" an answer by 4412 // returning the CPU usage if it's under 100%, and the run queue 4413 // length otherwise. It turns out that querying is pretty slow 4414 // on Windows, on the order of 200 microseconds on a fast machine. 4415 // Note that on the Windows the CPU usage value is the % usage 4416 // since the last time the API was called (and the first call 4417 // returns 100%), so we'd have to deal with that as well. 4418 // 4419 // b) Sample the "fake" answer using a sampling thread and store 4420 // the answer in a global variable. The call to loadavg would 4421 // just return the value of the global, avoiding the slow query. 4422 // 4423 // c) Sample a better answer using exponential decay to smooth the 4424 // value. This is basically the algorithm used by UNIX kernels. 4425 // 4426 // Note that sampling thread starvation could affect both (b) and (c). 4427 int os::loadavg(double loadavg[], int nelem) { 4428 return -1; 4429 } 4430 4431 4432 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 4433 bool os::dont_yield() { 4434 return DontYieldALot; 4435 } 4436 4437 // This method is a slightly reworked copy of JDK's sysOpen 4438 // from src/windows/hpi/src/sys_api_md.c 4439 4440 int os::open(const char *path, int oflag, int mode) { 4441 char pathbuf[MAX_PATH]; 4442 4443 if (strlen(path) > MAX_PATH - 1) { 4444 errno = ENAMETOOLONG; 4445 return -1; 4446 } 4447 os::native_path(strcpy(pathbuf, path)); 4448 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 4449 } 4450 4451 FILE* os::open(int fd, const char* mode) { 4452 return ::_fdopen(fd, mode); 4453 } 4454 4455 // Is a (classpath) directory empty? 4456 bool os::dir_is_empty(const char* path) { 4457 WIN32_FIND_DATA fd; 4458 HANDLE f = FindFirstFile(path, &fd); 4459 if (f == INVALID_HANDLE_VALUE) { 4460 return true; 4461 } 4462 FindClose(f); 4463 return false; 4464 } 4465 4466 // create binary file, rewriting existing file if required 4467 int os::create_binary_file(const char* path, bool rewrite_existing) { 4468 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 4469 if (!rewrite_existing) { 4470 oflags |= _O_EXCL; 4471 } 4472 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 4473 } 4474 4475 // return current position of file pointer 4476 jlong os::current_file_offset(int fd) { 4477 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 4478 } 4479 4480 // move file pointer to the specified offset 4481 jlong os::seek_to_file_offset(int fd, jlong offset) { 4482 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 4483 } 4484 4485 4486 jlong os::lseek(int fd, jlong offset, int whence) { 4487 return (jlong) ::_lseeki64(fd, offset, whence); 4488 } 4489 4490 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 4491 OVERLAPPED ov; 4492 DWORD nread; 4493 BOOL result; 4494 4495 ZeroMemory(&ov, sizeof(ov)); 4496 ov.Offset = (DWORD)offset; 4497 ov.OffsetHigh = (DWORD)(offset >> 32); 4498 4499 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4500 4501 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov); 4502 4503 return result ? nread : 0; 4504 } 4505 4506 4507 // This method is a slightly reworked copy of JDK's sysNativePath 4508 // from src/windows/hpi/src/path_md.c 4509 4510 // Convert a pathname to native format. On win32, this involves forcing all 4511 // separators to be '\\' rather than '/' (both are legal inputs, but Win95 4512 // sometimes rejects '/') and removing redundant separators. The input path is 4513 // assumed to have been converted into the character encoding used by the local 4514 // system. Because this might be a double-byte encoding, care is taken to 4515 // treat double-byte lead characters correctly. 4516 // 4517 // This procedure modifies the given path in place, as the result is never 4518 // longer than the original. There is no error return; this operation always 4519 // succeeds. 4520 char * os::native_path(char *path) { 4521 char *src = path, *dst = path, *end = path; 4522 char *colon = NULL; // If a drive specifier is found, this will 4523 // point to the colon following the drive letter 4524 4525 // Assumption: '/', '\\', ':', and drive letters are never lead bytes 4526 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\')) 4527 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte"); 4528 4529 // Check for leading separators 4530 #define isfilesep(c) ((c) == '/' || (c) == '\\') 4531 while (isfilesep(*src)) { 4532 src++; 4533 } 4534 4535 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 4536 // Remove leading separators if followed by drive specifier. This 4537 // hack is necessary to support file URLs containing drive 4538 // specifiers (e.g., "file://c:/path"). As a side effect, 4539 // "/c:/path" can be used as an alternative to "c:/path". 4540 *dst++ = *src++; 4541 colon = dst; 4542 *dst++ = ':'; 4543 src++; 4544 } else { 4545 src = path; 4546 if (isfilesep(src[0]) && isfilesep(src[1])) { 4547 // UNC pathname: Retain first separator; leave src pointed at 4548 // second separator so that further separators will be collapsed 4549 // into the second separator. The result will be a pathname 4550 // beginning with "\\\\" followed (most likely) by a host name. 4551 src = dst = path + 1; 4552 path[0] = '\\'; // Force first separator to '\\' 4553 } 4554 } 4555 4556 end = dst; 4557 4558 // Remove redundant separators from remainder of path, forcing all 4559 // separators to be '\\' rather than '/'. Also, single byte space 4560 // characters are removed from the end of the path because those 4561 // are not legal ending characters on this operating system. 4562 // 4563 while (*src != '\0') { 4564 if (isfilesep(*src)) { 4565 *dst++ = '\\'; src++; 4566 while (isfilesep(*src)) src++; 4567 if (*src == '\0') { 4568 // Check for trailing separator 4569 end = dst; 4570 if (colon == dst - 2) break; // "z:\\" 4571 if (dst == path + 1) break; // "\\" 4572 if (dst == path + 2 && isfilesep(path[0])) { 4573 // "\\\\" is not collapsed to "\\" because "\\\\" marks the 4574 // beginning of a UNC pathname. Even though it is not, by 4575 // itself, a valid UNC pathname, we leave it as is in order 4576 // to be consistent with the path canonicalizer as well 4577 // as the win32 APIs, which treat this case as an invalid 4578 // UNC pathname rather than as an alias for the root 4579 // directory of the current drive. 4580 break; 4581 } 4582 end = --dst; // Path does not denote a root directory, so 4583 // remove trailing separator 4584 break; 4585 } 4586 end = dst; 4587 } else { 4588 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character 4589 *dst++ = *src++; 4590 if (*src) *dst++ = *src++; 4591 end = dst; 4592 } else { // Copy a single-byte character 4593 char c = *src++; 4594 *dst++ = c; 4595 // Space is not a legal ending character 4596 if (c != ' ') end = dst; 4597 } 4598 } 4599 } 4600 4601 *end = '\0'; 4602 4603 // For "z:", add "." to work around a bug in the C runtime library 4604 if (colon == dst - 1) { 4605 path[2] = '.'; 4606 path[3] = '\0'; 4607 } 4608 4609 return path; 4610 } 4611 4612 // This code is a copy of JDK's sysSetLength 4613 // from src/windows/hpi/src/sys_api_md.c 4614 4615 int os::ftruncate(int fd, jlong length) { 4616 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4617 long high = (long)(length >> 32); 4618 DWORD ret; 4619 4620 if (h == (HANDLE)(-1)) { 4621 return -1; 4622 } 4623 4624 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 4625 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 4626 return -1; 4627 } 4628 4629 if (::SetEndOfFile(h) == FALSE) { 4630 return -1; 4631 } 4632 4633 return 0; 4634 } 4635 4636 int os::get_fileno(FILE* fp) { 4637 return _fileno(fp); 4638 } 4639 4640 // This code is a copy of JDK's sysSync 4641 // from src/windows/hpi/src/sys_api_md.c 4642 // except for the legacy workaround for a bug in Win 98 4643 4644 int os::fsync(int fd) { 4645 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 4646 4647 if ((!::FlushFileBuffers(handle)) && 4648 (GetLastError() != ERROR_ACCESS_DENIED)) { 4649 // from winerror.h 4650 return -1; 4651 } 4652 return 0; 4653 } 4654 4655 static int nonSeekAvailable(int, long *); 4656 static int stdinAvailable(int, long *); 4657 4658 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR) 4659 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO) 4660 4661 // This code is a copy of JDK's sysAvailable 4662 // from src/windows/hpi/src/sys_api_md.c 4663 4664 int os::available(int fd, jlong *bytes) { 4665 jlong cur, end; 4666 struct _stati64 stbuf64; 4667 4668 if (::_fstati64(fd, &stbuf64) >= 0) { 4669 int mode = stbuf64.st_mode; 4670 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 4671 int ret; 4672 long lpbytes; 4673 if (fd == 0) { 4674 ret = stdinAvailable(fd, &lpbytes); 4675 } else { 4676 ret = nonSeekAvailable(fd, &lpbytes); 4677 } 4678 (*bytes) = (jlong)(lpbytes); 4679 return ret; 4680 } 4681 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 4682 return FALSE; 4683 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 4684 return FALSE; 4685 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 4686 return FALSE; 4687 } 4688 *bytes = end - cur; 4689 return TRUE; 4690 } else { 4691 return FALSE; 4692 } 4693 } 4694 4695 void os::flockfile(FILE* fp) { 4696 _lock_file(fp); 4697 } 4698 4699 void os::funlockfile(FILE* fp) { 4700 _unlock_file(fp); 4701 } 4702 4703 // This code is a copy of JDK's nonSeekAvailable 4704 // from src/windows/hpi/src/sys_api_md.c 4705 4706 static int nonSeekAvailable(int fd, long *pbytes) { 4707 // This is used for available on non-seekable devices 4708 // (like both named and anonymous pipes, such as pipes 4709 // connected to an exec'd process). 4710 // Standard Input is a special case. 4711 HANDLE han; 4712 4713 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 4714 return FALSE; 4715 } 4716 4717 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 4718 // PeekNamedPipe fails when at EOF. In that case we 4719 // simply make *pbytes = 0 which is consistent with the 4720 // behavior we get on Solaris when an fd is at EOF. 4721 // The only alternative is to raise an Exception, 4722 // which isn't really warranted. 4723 // 4724 if (::GetLastError() != ERROR_BROKEN_PIPE) { 4725 return FALSE; 4726 } 4727 *pbytes = 0; 4728 } 4729 return TRUE; 4730 } 4731 4732 #define MAX_INPUT_EVENTS 2000 4733 4734 // This code is a copy of JDK's stdinAvailable 4735 // from src/windows/hpi/src/sys_api_md.c 4736 4737 static int stdinAvailable(int fd, long *pbytes) { 4738 HANDLE han; 4739 DWORD numEventsRead = 0; // Number of events read from buffer 4740 DWORD numEvents = 0; // Number of events in buffer 4741 DWORD i = 0; // Loop index 4742 DWORD curLength = 0; // Position marker 4743 DWORD actualLength = 0; // Number of bytes readable 4744 BOOL error = FALSE; // Error holder 4745 INPUT_RECORD *lpBuffer; // Pointer to records of input events 4746 4747 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4748 return FALSE; 4749 } 4750 4751 // Construct an array of input records in the console buffer 4752 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4753 if (error == 0) { 4754 return nonSeekAvailable(fd, pbytes); 4755 } 4756 4757 // lpBuffer must fit into 64K or else PeekConsoleInput fails 4758 if (numEvents > MAX_INPUT_EVENTS) { 4759 numEvents = MAX_INPUT_EVENTS; 4760 } 4761 4762 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal); 4763 if (lpBuffer == NULL) { 4764 return FALSE; 4765 } 4766 4767 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4768 if (error == 0) { 4769 os::free(lpBuffer); 4770 return FALSE; 4771 } 4772 4773 // Examine input records for the number of bytes available 4774 for (i=0; i<numEvents; i++) { 4775 if (lpBuffer[i].EventType == KEY_EVENT) { 4776 4777 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4778 &(lpBuffer[i].Event); 4779 if (keyRecord->bKeyDown == TRUE) { 4780 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4781 curLength++; 4782 if (*keyPressed == '\r') { 4783 actualLength = curLength; 4784 } 4785 } 4786 } 4787 } 4788 4789 if (lpBuffer != NULL) { 4790 os::free(lpBuffer); 4791 } 4792 4793 *pbytes = (long) actualLength; 4794 return TRUE; 4795 } 4796 4797 // Map a block of memory. 4798 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4799 char *addr, size_t bytes, bool read_only, 4800 bool allow_exec) { 4801 HANDLE hFile; 4802 char* base; 4803 4804 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4805 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4806 if (hFile == NULL) { 4807 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError()); 4808 return NULL; 4809 } 4810 4811 if (allow_exec) { 4812 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4813 // unless it comes from a PE image (which the shared archive is not.) 4814 // Even VirtualProtect refuses to give execute access to mapped memory 4815 // that was not previously executable. 4816 // 4817 // Instead, stick the executable region in anonymous memory. Yuck. 4818 // Penalty is that ~4 pages will not be shareable - in the future 4819 // we might consider DLLizing the shared archive with a proper PE 4820 // header so that mapping executable + sharing is possible. 4821 4822 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4823 PAGE_READWRITE); 4824 if (base == NULL) { 4825 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError()); 4826 CloseHandle(hFile); 4827 return NULL; 4828 } 4829 4830 DWORD bytes_read; 4831 OVERLAPPED overlapped; 4832 overlapped.Offset = (DWORD)file_offset; 4833 overlapped.OffsetHigh = 0; 4834 overlapped.hEvent = NULL; 4835 // ReadFile guarantees that if the return value is true, the requested 4836 // number of bytes were read before returning. 4837 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 4838 if (!res) { 4839 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError()); 4840 release_memory(base, bytes); 4841 CloseHandle(hFile); 4842 return NULL; 4843 } 4844 } else { 4845 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 4846 NULL /* file_name */); 4847 if (hMap == NULL) { 4848 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError()); 4849 CloseHandle(hFile); 4850 return NULL; 4851 } 4852 4853 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 4854 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 4855 (DWORD)bytes, addr); 4856 if (base == NULL) { 4857 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError()); 4858 CloseHandle(hMap); 4859 CloseHandle(hFile); 4860 return NULL; 4861 } 4862 4863 if (CloseHandle(hMap) == 0) { 4864 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError()); 4865 CloseHandle(hFile); 4866 return base; 4867 } 4868 } 4869 4870 if (allow_exec) { 4871 DWORD old_protect; 4872 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 4873 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 4874 4875 if (!res) { 4876 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError()); 4877 // Don't consider this a hard error, on IA32 even if the 4878 // VirtualProtect fails, we should still be able to execute 4879 CloseHandle(hFile); 4880 return base; 4881 } 4882 } 4883 4884 if (CloseHandle(hFile) == 0) { 4885 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError()); 4886 return base; 4887 } 4888 4889 return base; 4890 } 4891 4892 4893 // Remap a block of memory. 4894 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4895 char *addr, size_t bytes, bool read_only, 4896 bool allow_exec) { 4897 // This OS does not allow existing memory maps to be remapped so we 4898 // have to unmap the memory before we remap it. 4899 if (!os::unmap_memory(addr, bytes)) { 4900 return NULL; 4901 } 4902 4903 // There is a very small theoretical window between the unmap_memory() 4904 // call above and the map_memory() call below where a thread in native 4905 // code may be able to access an address that is no longer mapped. 4906 4907 return os::map_memory(fd, file_name, file_offset, addr, bytes, 4908 read_only, allow_exec); 4909 } 4910 4911 4912 // Unmap a block of memory. 4913 // Returns true=success, otherwise false. 4914 4915 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4916 MEMORY_BASIC_INFORMATION mem_info; 4917 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) { 4918 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError()); 4919 return false; 4920 } 4921 4922 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx. 4923 // Instead, executable region was allocated using VirtualAlloc(). See 4924 // pd_map_memory() above. 4925 // 4926 // The following flags should match the 'exec_access' flages used for 4927 // VirtualProtect() in pd_map_memory(). 4928 if (mem_info.Protect == PAGE_EXECUTE_READ || 4929 mem_info.Protect == PAGE_EXECUTE_READWRITE) { 4930 return pd_release_memory(addr, bytes); 4931 } 4932 4933 BOOL result = UnmapViewOfFile(addr); 4934 if (result == 0) { 4935 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError()); 4936 return false; 4937 } 4938 return true; 4939 } 4940 4941 void os::pause() { 4942 char filename[MAX_PATH]; 4943 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4944 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4945 } else { 4946 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4947 } 4948 4949 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4950 if (fd != -1) { 4951 struct stat buf; 4952 ::close(fd); 4953 while (::stat(filename, &buf) == 0) { 4954 Sleep(100); 4955 } 4956 } else { 4957 jio_fprintf(stderr, 4958 "Could not open pause file '%s', continuing immediately.\n", filename); 4959 } 4960 } 4961 4962 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 4963 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 4964 } 4965 4966 // See the caveats for this class in os_windows.hpp 4967 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back 4968 // into this method and returns false. If no OS EXCEPTION was raised, returns 4969 // true. 4970 // The callback is supposed to provide the method that should be protected. 4971 // 4972 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 4973 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); 4974 assert(!WatcherThread::watcher_thread()->has_crash_protection(), 4975 "crash_protection already set?"); 4976 4977 bool success = true; 4978 __try { 4979 WatcherThread::watcher_thread()->set_crash_protection(this); 4980 cb.call(); 4981 } __except(EXCEPTION_EXECUTE_HANDLER) { 4982 // only for protection, nothing to do 4983 success = false; 4984 } 4985 WatcherThread::watcher_thread()->set_crash_protection(NULL); 4986 return success; 4987 } 4988 4989 // An Event wraps a win32 "CreateEvent" kernel handle. 4990 // 4991 // We have a number of choices regarding "CreateEvent" win32 handle leakage: 4992 // 4993 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 4994 // field, and call CloseHandle() on the win32 event handle. Unpark() would 4995 // need to be modified to tolerate finding a NULL (invalid) win32 event handle. 4996 // In addition, an unpark() operation might fetch the handle field, but the 4997 // event could recycle between the fetch and the SetEvent() operation. 4998 // SetEvent() would either fail because the handle was invalid, or inadvertently work, 4999 // as the win32 handle value had been recycled. In an ideal world calling SetEvent() 5000 // on an stale but recycled handle would be harmless, but in practice this might 5001 // confuse other non-Sun code, so it's not a viable approach. 5002 // 5003 // 2: Once a win32 event handle is associated with an Event, it remains associated 5004 // with the Event. The event handle is never closed. This could be construed 5005 // as handle leakage, but only up to the maximum # of threads that have been extant 5006 // at any one time. This shouldn't be an issue, as windows platforms typically 5007 // permit a process to have hundreds of thousands of open handles. 5008 // 5009 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 5010 // and release unused handles. 5011 // 5012 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 5013 // It's not clear, however, that we wouldn't be trading one type of leak for another. 5014 // 5015 // 5. Use an RCU-like mechanism (Read-Copy Update). 5016 // Or perhaps something similar to Maged Michael's "Hazard pointers". 5017 // 5018 // We use (2). 5019 // 5020 // TODO-FIXME: 5021 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 5022 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 5023 // to recover from (or at least detect) the dreaded Windows 841176 bug. 5024 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 5025 // into a single win32 CreateEvent() handle. 5026 // 5027 // Assumption: 5028 // Only one parker can exist on an event, which is why we allocate 5029 // them per-thread. Multiple unparkers can coexist. 5030 // 5031 // _Event transitions in park() 5032 // -1 => -1 : illegal 5033 // 1 => 0 : pass - return immediately 5034 // 0 => -1 : block; then set _Event to 0 before returning 5035 // 5036 // _Event transitions in unpark() 5037 // 0 => 1 : just return 5038 // 1 => 1 : just return 5039 // -1 => either 0 or 1; must signal target thread 5040 // That is, we can safely transition _Event from -1 to either 5041 // 0 or 1. 5042 // 5043 // _Event serves as a restricted-range semaphore. 5044 // -1 : thread is blocked, i.e. there is a waiter 5045 // 0 : neutral: thread is running or ready, 5046 // could have been signaled after a wait started 5047 // 1 : signaled - thread is running or ready 5048 // 5049 // Another possible encoding of _Event would be with 5050 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5051 // 5052 5053 int os::PlatformEvent::park(jlong Millis) { 5054 // Transitions for _Event: 5055 // -1 => -1 : illegal 5056 // 1 => 0 : pass - return immediately 5057 // 0 => -1 : block; then set _Event to 0 before returning 5058 5059 guarantee(_ParkHandle != NULL , "Invariant"); 5060 guarantee(Millis > 0 , "Invariant"); 5061 5062 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 5063 // the initial park() operation. 5064 // Consider: use atomic decrement instead of CAS-loop 5065 5066 int v; 5067 for (;;) { 5068 v = _Event; 5069 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5070 } 5071 guarantee((v == 0) || (v == 1), "invariant"); 5072 if (v != 0) return OS_OK; 5073 5074 // Do this the hard way by blocking ... 5075 // TODO: consider a brief spin here, gated on the success of recent 5076 // spin attempts by this thread. 5077 // 5078 // We decompose long timeouts into series of shorter timed waits. 5079 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 5080 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 5081 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 5082 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 5083 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 5084 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 5085 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 5086 // for the already waited time. This policy does not admit any new outcomes. 5087 // In the future, however, we might want to track the accumulated wait time and 5088 // adjust Millis accordingly if we encounter a spurious wakeup. 5089 5090 const int MAXTIMEOUT = 0x10000000; 5091 DWORD rv = WAIT_TIMEOUT; 5092 while (_Event < 0 && Millis > 0) { 5093 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT) 5094 if (Millis > MAXTIMEOUT) { 5095 prd = MAXTIMEOUT; 5096 } 5097 rv = ::WaitForSingleObject(_ParkHandle, prd); 5098 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed"); 5099 if (rv == WAIT_TIMEOUT) { 5100 Millis -= prd; 5101 } 5102 } 5103 v = _Event; 5104 _Event = 0; 5105 // see comment at end of os::PlatformEvent::park() below: 5106 OrderAccess::fence(); 5107 // If we encounter a nearly simultanous timeout expiry and unpark() 5108 // we return OS_OK indicating we awoke via unpark(). 5109 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 5110 return (v >= 0) ? OS_OK : OS_TIMEOUT; 5111 } 5112 5113 void os::PlatformEvent::park() { 5114 // Transitions for _Event: 5115 // -1 => -1 : illegal 5116 // 1 => 0 : pass - return immediately 5117 // 0 => -1 : block; then set _Event to 0 before returning 5118 5119 guarantee(_ParkHandle != NULL, "Invariant"); 5120 // Invariant: Only the thread associated with the Event/PlatformEvent 5121 // may call park(). 5122 // Consider: use atomic decrement instead of CAS-loop 5123 int v; 5124 for (;;) { 5125 v = _Event; 5126 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5127 } 5128 guarantee((v == 0) || (v == 1), "invariant"); 5129 if (v != 0) return; 5130 5131 // Do this the hard way by blocking ... 5132 // TODO: consider a brief spin here, gated on the success of recent 5133 // spin attempts by this thread. 5134 while (_Event < 0) { 5135 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE); 5136 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed"); 5137 } 5138 5139 // Usually we'll find _Event == 0 at this point, but as 5140 // an optional optimization we clear it, just in case can 5141 // multiple unpark() operations drove _Event up to 1. 5142 _Event = 0; 5143 OrderAccess::fence(); 5144 guarantee(_Event >= 0, "invariant"); 5145 } 5146 5147 void os::PlatformEvent::unpark() { 5148 guarantee(_ParkHandle != NULL, "Invariant"); 5149 5150 // Transitions for _Event: 5151 // 0 => 1 : just return 5152 // 1 => 1 : just return 5153 // -1 => either 0 or 1; must signal target thread 5154 // That is, we can safely transition _Event from -1 to either 5155 // 0 or 1. 5156 // See also: "Semaphores in Plan 9" by Mullender & Cox 5157 // 5158 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5159 // that it will take two back-to-back park() calls for the owning 5160 // thread to block. This has the benefit of forcing a spurious return 5161 // from the first park() call after an unpark() call which will help 5162 // shake out uses of park() and unpark() without condition variables. 5163 5164 if (Atomic::xchg(1, &_Event) >= 0) return; 5165 5166 ::SetEvent(_ParkHandle); 5167 } 5168 5169 5170 // JSR166 5171 // ------------------------------------------------------- 5172 5173 // The Windows implementation of Park is very straightforward: Basic 5174 // operations on Win32 Events turn out to have the right semantics to 5175 // use them directly. We opportunistically resuse the event inherited 5176 // from Monitor. 5177 5178 void Parker::park(bool isAbsolute, jlong time) { 5179 guarantee(_ParkEvent != NULL, "invariant"); 5180 // First, demultiplex/decode time arguments 5181 if (time < 0) { // don't wait 5182 return; 5183 } else if (time == 0 && !isAbsolute) { 5184 time = INFINITE; 5185 } else if (isAbsolute) { 5186 time -= os::javaTimeMillis(); // convert to relative time 5187 if (time <= 0) { // already elapsed 5188 return; 5189 } 5190 } else { // relative 5191 time /= 1000000; // Must coarsen from nanos to millis 5192 if (time == 0) { // Wait for the minimal time unit if zero 5193 time = 1; 5194 } 5195 } 5196 5197 JavaThread* thread = JavaThread::current(); 5198 5199 // Don't wait if interrupted or already triggered 5200 if (Thread::is_interrupted(thread, false) || 5201 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 5202 ResetEvent(_ParkEvent); 5203 return; 5204 } else { 5205 ThreadBlockInVM tbivm(thread); 5206 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5207 thread->set_suspend_equivalent(); 5208 5209 WaitForSingleObject(_ParkEvent, time); 5210 ResetEvent(_ParkEvent); 5211 5212 // If externally suspended while waiting, re-suspend 5213 if (thread->handle_special_suspend_equivalent_condition()) { 5214 thread->java_suspend_self(); 5215 } 5216 } 5217 } 5218 5219 void Parker::unpark() { 5220 guarantee(_ParkEvent != NULL, "invariant"); 5221 SetEvent(_ParkEvent); 5222 } 5223 5224 // Run the specified command in a separate process. Return its exit value, 5225 // or -1 on failure (e.g. can't create a new process). 5226 int os::fork_and_exec(char* cmd) { 5227 STARTUPINFO si; 5228 PROCESS_INFORMATION pi; 5229 5230 memset(&si, 0, sizeof(si)); 5231 si.cb = sizeof(si); 5232 memset(&pi, 0, sizeof(pi)); 5233 BOOL rslt = CreateProcess(NULL, // executable name - use command line 5234 cmd, // command line 5235 NULL, // process security attribute 5236 NULL, // thread security attribute 5237 TRUE, // inherits system handles 5238 0, // no creation flags 5239 NULL, // use parent's environment block 5240 NULL, // use parent's starting directory 5241 &si, // (in) startup information 5242 &pi); // (out) process information 5243 5244 if (rslt) { 5245 // Wait until child process exits. 5246 WaitForSingleObject(pi.hProcess, INFINITE); 5247 5248 DWORD exit_code; 5249 GetExitCodeProcess(pi.hProcess, &exit_code); 5250 5251 // Close process and thread handles. 5252 CloseHandle(pi.hProcess); 5253 CloseHandle(pi.hThread); 5254 5255 return (int)exit_code; 5256 } else { 5257 return -1; 5258 } 5259 } 5260 5261 bool os::find(address addr, outputStream* st) { 5262 int offset = -1; 5263 bool result = false; 5264 char buf[256]; 5265 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) { 5266 st->print(PTR_FORMAT " ", addr); 5267 if (strlen(buf) < sizeof(buf) - 1) { 5268 char* p = strrchr(buf, '\\'); 5269 if (p) { 5270 st->print("%s", p + 1); 5271 } else { 5272 st->print("%s", buf); 5273 } 5274 } else { 5275 // The library name is probably truncated. Let's omit the library name. 5276 // See also JDK-8147512. 5277 } 5278 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) { 5279 st->print("::%s + 0x%x", buf, offset); 5280 } 5281 st->cr(); 5282 result = true; 5283 } 5284 return result; 5285 } 5286 5287 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 5288 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 5289 5290 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 5291 JavaThread* thread = JavaThread::current(); 5292 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 5293 address addr = (address) exceptionRecord->ExceptionInformation[1]; 5294 5295 if (os::is_memory_serialize_page(thread, addr)) { 5296 return EXCEPTION_CONTINUE_EXECUTION; 5297 } 5298 } 5299 5300 return EXCEPTION_CONTINUE_SEARCH; 5301 } 5302 5303 // We don't build a headless jre for Windows 5304 bool os::is_headless_jre() { return false; } 5305 5306 static jint initSock() { 5307 WSADATA wsadata; 5308 5309 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) { 5310 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n", 5311 ::GetLastError()); 5312 return JNI_ERR; 5313 } 5314 return JNI_OK; 5315 } 5316 5317 struct hostent* os::get_host_by_name(char* name) { 5318 return (struct hostent*)gethostbyname(name); 5319 } 5320 5321 int os::socket_close(int fd) { 5322 return ::closesocket(fd); 5323 } 5324 5325 int os::socket(int domain, int type, int protocol) { 5326 return ::socket(domain, type, protocol); 5327 } 5328 5329 int os::connect(int fd, struct sockaddr* him, socklen_t len) { 5330 return ::connect(fd, him, len); 5331 } 5332 5333 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5334 return ::recv(fd, buf, (int)nBytes, flags); 5335 } 5336 5337 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5338 return ::send(fd, buf, (int)nBytes, flags); 5339 } 5340 5341 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5342 return ::send(fd, buf, (int)nBytes, flags); 5343 } 5344 5345 // WINDOWS CONTEXT Flags for THREAD_SAMPLING 5346 #if defined(IA32) 5347 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS) 5348 #elif defined (AMD64) 5349 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT) 5350 #endif 5351 5352 // returns true if thread could be suspended, 5353 // false otherwise 5354 static bool do_suspend(HANDLE* h) { 5355 if (h != NULL) { 5356 if (SuspendThread(*h) != ~0) { 5357 return true; 5358 } 5359 } 5360 return false; 5361 } 5362 5363 // resume the thread 5364 // calling resume on an active thread is a no-op 5365 static void do_resume(HANDLE* h) { 5366 if (h != NULL) { 5367 ResumeThread(*h); 5368 } 5369 } 5370 5371 // retrieve a suspend/resume context capable handle 5372 // from the tid. Caller validates handle return value. 5373 void get_thread_handle_for_extended_context(HANDLE* h, 5374 OSThread::thread_id_t tid) { 5375 if (h != NULL) { 5376 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid); 5377 } 5378 } 5379 5380 // Thread sampling implementation 5381 // 5382 void os::SuspendedThreadTask::internal_do_task() { 5383 CONTEXT ctxt; 5384 HANDLE h = NULL; 5385 5386 // get context capable handle for thread 5387 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id()); 5388 5389 // sanity 5390 if (h == NULL || h == INVALID_HANDLE_VALUE) { 5391 return; 5392 } 5393 5394 // suspend the thread 5395 if (do_suspend(&h)) { 5396 ctxt.ContextFlags = sampling_context_flags; 5397 // get thread context 5398 GetThreadContext(h, &ctxt); 5399 SuspendedThreadTaskContext context(_thread, &ctxt); 5400 // pass context to Thread Sampling impl 5401 do_task(context); 5402 // resume thread 5403 do_resume(&h); 5404 } 5405 5406 // close handle 5407 CloseHandle(h); 5408 } 5409 5410 bool os::start_debugging(char *buf, int buflen) { 5411 int len = (int)strlen(buf); 5412 char *p = &buf[len]; 5413 5414 jio_snprintf(p, buflen-len, 5415 "\n\n" 5416 "Do you want to debug the problem?\n\n" 5417 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n" 5418 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n" 5419 "Otherwise, select 'No' to abort...", 5420 os::current_process_id(), os::current_thread_id()); 5421 5422 bool yes = os::message_box("Unexpected Error", buf); 5423 5424 if (yes) { 5425 // os::breakpoint() calls DebugBreak(), which causes a breakpoint 5426 // exception. If VM is running inside a debugger, the debugger will 5427 // catch the exception. Otherwise, the breakpoint exception will reach 5428 // the default windows exception handler, which can spawn a debugger and 5429 // automatically attach to the dying VM. 5430 os::breakpoint(); 5431 yes = false; 5432 } 5433 return yes; 5434 } 5435 5436 void* os::get_default_process_handle() { 5437 return (void*)GetModuleHandle(NULL); 5438 } 5439 5440 // Builds a platform dependent Agent_OnLoad_<lib_name> function name 5441 // which is used to find statically linked in agents. 5442 // Additionally for windows, takes into account __stdcall names. 5443 // Parameters: 5444 // sym_name: Symbol in library we are looking for 5445 // lib_name: Name of library to look in, NULL for shared libs. 5446 // is_absolute_path == true if lib_name is absolute path to agent 5447 // such as "C:/a/b/L.dll" 5448 // == false if only the base name of the library is passed in 5449 // such as "L" 5450 char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 5451 bool is_absolute_path) { 5452 char *agent_entry_name; 5453 size_t len; 5454 size_t name_len; 5455 size_t prefix_len = strlen(JNI_LIB_PREFIX); 5456 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 5457 const char *start; 5458 5459 if (lib_name != NULL) { 5460 len = name_len = strlen(lib_name); 5461 if (is_absolute_path) { 5462 // Need to strip path, prefix and suffix 5463 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 5464 lib_name = ++start; 5465 } else { 5466 // Need to check for drive prefix 5467 if ((start = strchr(lib_name, ':')) != NULL) { 5468 lib_name = ++start; 5469 } 5470 } 5471 if (len <= (prefix_len + suffix_len)) { 5472 return NULL; 5473 } 5474 lib_name += prefix_len; 5475 name_len = strlen(lib_name) - suffix_len; 5476 } 5477 } 5478 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 5479 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 5480 if (agent_entry_name == NULL) { 5481 return NULL; 5482 } 5483 if (lib_name != NULL) { 5484 const char *p = strrchr(sym_name, '@'); 5485 if (p != NULL && p != sym_name) { 5486 // sym_name == _Agent_OnLoad@XX 5487 strncpy(agent_entry_name, sym_name, (p - sym_name)); 5488 agent_entry_name[(p-sym_name)] = '\0'; 5489 // agent_entry_name == _Agent_OnLoad 5490 strcat(agent_entry_name, "_"); 5491 strncat(agent_entry_name, lib_name, name_len); 5492 strcat(agent_entry_name, p); 5493 // agent_entry_name == _Agent_OnLoad_lib_name@XX 5494 } else { 5495 strcpy(agent_entry_name, sym_name); 5496 strcat(agent_entry_name, "_"); 5497 strncat(agent_entry_name, lib_name, name_len); 5498 } 5499 } else { 5500 strcpy(agent_entry_name, sym_name); 5501 } 5502 return agent_entry_name; 5503 } 5504 5505 #ifndef PRODUCT 5506 5507 // test the code path in reserve_memory_special() that tries to allocate memory in a single 5508 // contiguous memory block at a particular address. 5509 // The test first tries to find a good approximate address to allocate at by using the same 5510 // method to allocate some memory at any address. The test then tries to allocate memory in 5511 // the vicinity (not directly after it to avoid possible by-chance use of that location) 5512 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of 5513 // the previously allocated memory is available for allocation. The only actual failure 5514 // that is reported is when the test tries to allocate at a particular location but gets a 5515 // different valid one. A NULL return value at this point is not considered an error but may 5516 // be legitimate. 5517 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages. 5518 void TestReserveMemorySpecial_test() { 5519 if (!UseLargePages) { 5520 if (VerboseInternalVMTests) { 5521 tty->print("Skipping test because large pages are disabled"); 5522 } 5523 return; 5524 } 5525 // save current value of globals 5526 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; 5527 bool old_use_numa_interleaving = UseNUMAInterleaving; 5528 5529 // set globals to make sure we hit the correct code path 5530 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; 5531 5532 // do an allocation at an address selected by the OS to get a good one. 5533 const size_t large_allocation_size = os::large_page_size() * 4; 5534 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); 5535 if (result == NULL) { 5536 if (VerboseInternalVMTests) { 5537 tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.", 5538 large_allocation_size); 5539 } 5540 } else { 5541 os::release_memory_special(result, large_allocation_size); 5542 5543 // allocate another page within the recently allocated memory area which seems to be a good location. At least 5544 // we managed to get it once. 5545 const size_t expected_allocation_size = os::large_page_size(); 5546 char* expected_location = result + os::large_page_size(); 5547 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); 5548 if (actual_location == NULL) { 5549 if (VerboseInternalVMTests) { 5550 tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.", 5551 expected_location, large_allocation_size); 5552 } 5553 } else { 5554 // release memory 5555 os::release_memory_special(actual_location, expected_allocation_size); 5556 // only now check, after releasing any memory to avoid any leaks. 5557 assert(actual_location == expected_location, 5558 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead", 5559 expected_location, expected_allocation_size, actual_location); 5560 } 5561 } 5562 5563 // restore globals 5564 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; 5565 UseNUMAInterleaving = old_use_numa_interleaving; 5566 } 5567 #endif // PRODUCT 5568 5569 /* 5570 All the defined signal names for Windows. 5571 5572 NOTE that not all of these names are accepted by FindSignal! 5573 5574 For various reasons some of these may be rejected at runtime. 5575 5576 Here are the names currently accepted by a user of sun.misc.Signal with 5577 1.4.1 (ignoring potential interaction with use of chaining, etc): 5578 5579 (LIST TBD) 5580 5581 */ 5582 int os::get_signal_number(const char* name) { 5583 static const struct { 5584 char* name; 5585 int number; 5586 } siglabels [] = 5587 // derived from version 6.0 VC98/include/signal.h 5588 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl 5589 "FPE", SIGFPE, // floating point exception 5590 "SEGV", SIGSEGV, // segment violation 5591 "INT", SIGINT, // interrupt 5592 "TERM", SIGTERM, // software term signal from kill 5593 "BREAK", SIGBREAK, // Ctrl-Break sequence 5594 "ILL", SIGILL}; // illegal instruction 5595 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) { 5596 if (strcmp(name, siglabels[i].name) == 0) { 5597 return siglabels[i].number; 5598 } 5599 } 5600 return -1; 5601 } 5602 5603 // Fast current thread access 5604 5605 int os::win32::_thread_ptr_offset = 0; 5606 5607 static void call_wrapper_dummy() {} 5608 5609 // We need to call the os_exception_wrapper once so that it sets 5610 // up the offset from FS of the thread pointer. 5611 void os::win32::initialize_thread_ptr_offset() { 5612 os::os_exception_wrapper((java_call_t)call_wrapper_dummy, 5613 NULL, NULL, NULL, NULL); 5614 }