1 /* 2 * Copyright (c) 1997, 2019, 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 "jvm.h" 30 #include "classfile/classLoader.hpp" 31 #include "classfile/systemDictionary.hpp" 32 #include "classfile/vmSymbols.hpp" 33 #include "code/icBuffer.hpp" 34 #include "code/vtableStubs.hpp" 35 #include "compiler/compileBroker.hpp" 36 #include "compiler/disassembler.hpp" 37 #include "interpreter/interpreter.hpp" 38 #include "logging/log.hpp" 39 #include "logging/logStream.hpp" 40 #include "memory/allocation.inline.hpp" 41 #include "memory/filemap.hpp" 42 #include "oops/oop.inline.hpp" 43 #include "os_share_windows.hpp" 44 #include "os_windows.inline.hpp" 45 #include "prims/jniFastGetField.hpp" 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.inline.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.hpp" 57 #include "runtime/osThread.hpp" 58 #include "runtime/perfMemory.hpp" 59 #include "runtime/sharedRuntime.hpp" 60 #include "runtime/statSampler.hpp" 61 #include "runtime/stubRoutines.hpp" 62 #include "runtime/thread.inline.hpp" 63 #include "runtime/threadCritical.hpp" 64 #include "runtime/timer.hpp" 65 #include "runtime/vm_version.hpp" 66 #include "services/attachListener.hpp" 67 #include "services/memTracker.hpp" 68 #include "services/runtimeService.hpp" 69 #include "utilities/align.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 #include "symbolengine.hpp" 77 #include "windbghelp.hpp" 78 79 80 #ifdef _DEBUG 81 #include <crtdbg.h> 82 #endif 83 84 85 #include <windows.h> 86 #include <sys/types.h> 87 #include <sys/stat.h> 88 #include <sys/timeb.h> 89 #include <objidl.h> 90 #include <shlobj.h> 91 92 #include <malloc.h> 93 #include <signal.h> 94 #include <direct.h> 95 #include <errno.h> 96 #include <fcntl.h> 97 #include <io.h> 98 #include <process.h> // For _beginthreadex(), _endthreadex() 99 #include <imagehlp.h> // For os::dll_address_to_function_name 100 // for enumerating dll libraries 101 #include <vdmdbg.h> 102 #include <psapi.h> 103 #include <mmsystem.h> 104 #include <winsock2.h> 105 106 // for timer info max values which include all bits 107 #define ALL_64_BITS CONST64(-1) 108 109 // For DLL loading/load error detection 110 // Values of PE COFF 111 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c 112 #define IMAGE_FILE_SIGNATURE_LENGTH 4 113 114 static HANDLE main_process; 115 static HANDLE main_thread; 116 static int main_thread_id; 117 118 static FILETIME process_creation_time; 119 static FILETIME process_exit_time; 120 static FILETIME process_user_time; 121 static FILETIME process_kernel_time; 122 123 #ifdef _M_AMD64 124 #define __CPU__ amd64 125 #else 126 #define __CPU__ i486 127 #endif 128 129 #if INCLUDE_AOT 130 PVOID topLevelVectoredExceptionHandler = NULL; 131 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 132 #endif 133 134 // save DLL module handle, used by GetModuleFileName 135 136 HINSTANCE vm_lib_handle; 137 138 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { 139 switch (reason) { 140 case DLL_PROCESS_ATTACH: 141 vm_lib_handle = hinst; 142 if (ForceTimeHighResolution) { 143 timeBeginPeriod(1L); 144 } 145 WindowsDbgHelp::pre_initialize(); 146 SymbolEngine::pre_initialize(); 147 break; 148 case DLL_PROCESS_DETACH: 149 if (ForceTimeHighResolution) { 150 timeEndPeriod(1L); 151 } 152 #if INCLUDE_AOT 153 if (topLevelVectoredExceptionHandler != NULL) { 154 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler); 155 topLevelVectoredExceptionHandler = NULL; 156 } 157 #endif 158 break; 159 default: 160 break; 161 } 162 return true; 163 } 164 165 static inline double fileTimeAsDouble(FILETIME* time) { 166 const double high = (double) ((unsigned int) ~0); 167 const double split = 10000000.0; 168 double result = (time->dwLowDateTime / split) + 169 time->dwHighDateTime * (high/split); 170 return result; 171 } 172 173 // Implementation of os 174 175 bool os::unsetenv(const char* name) { 176 assert(name != NULL, "Null pointer"); 177 return (SetEnvironmentVariable(name, NULL) == TRUE); 178 } 179 180 // No setuid programs under Windows. 181 bool os::have_special_privileges() { 182 return false; 183 } 184 185 186 // This method is a periodic task to check for misbehaving JNI applications 187 // under CheckJNI, we can add any periodic checks here. 188 // For Windows at the moment does nothing 189 void os::run_periodic_checks() { 190 return; 191 } 192 193 // previous UnhandledExceptionFilter, if there is one 194 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL; 195 196 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 197 198 void os::init_system_properties_values() { 199 // sysclasspath, java_home, dll_dir 200 { 201 char *home_path; 202 char *dll_path; 203 char *pslash; 204 const char *bin = "\\bin"; 205 char home_dir[MAX_PATH + 1]; 206 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR"); 207 208 if (alt_home_dir != NULL) { 209 strncpy(home_dir, alt_home_dir, MAX_PATH + 1); 210 home_dir[MAX_PATH] = '\0'; 211 } else { 212 os::jvm_path(home_dir, sizeof(home_dir)); 213 // Found the full path to jvm.dll. 214 // Now cut the path to <java_home>/jre if we can. 215 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll 216 pslash = strrchr(home_dir, '\\'); 217 if (pslash != NULL) { 218 *pslash = '\0'; // get rid of \{client|server} 219 pslash = strrchr(home_dir, '\\'); 220 if (pslash != NULL) { 221 *pslash = '\0'; // get rid of \bin 222 } 223 } 224 } 225 226 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal); 227 strcpy(home_path, home_dir); 228 Arguments::set_java_home(home_path); 229 FREE_C_HEAP_ARRAY(char, home_path); 230 231 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, 232 mtInternal); 233 strcpy(dll_path, home_dir); 234 strcat(dll_path, bin); 235 Arguments::set_dll_dir(dll_path); 236 FREE_C_HEAP_ARRAY(char, dll_path); 237 238 if (!set_boot_path('\\', ';')) { 239 vm_exit_during_initialization("Failed setting boot class path.", NULL); 240 } 241 } 242 243 // library_path 244 #define EXT_DIR "\\lib\\ext" 245 #define BIN_DIR "\\bin" 246 #define PACKAGE_DIR "\\Sun\\Java" 247 { 248 // Win32 library search order (See the documentation for LoadLibrary): 249 // 250 // 1. The directory from which application is loaded. 251 // 2. The system wide Java Extensions directory (Java only) 252 // 3. System directory (GetSystemDirectory) 253 // 4. Windows directory (GetWindowsDirectory) 254 // 5. The PATH environment variable 255 // 6. The current directory 256 257 char *library_path; 258 char tmp[MAX_PATH]; 259 char *path_str = ::getenv("PATH"); 260 261 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 262 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal); 263 264 library_path[0] = '\0'; 265 266 GetModuleFileName(NULL, tmp, sizeof(tmp)); 267 *(strrchr(tmp, '\\')) = '\0'; 268 strcat(library_path, tmp); 269 270 GetWindowsDirectory(tmp, sizeof(tmp)); 271 strcat(library_path, ";"); 272 strcat(library_path, tmp); 273 strcat(library_path, PACKAGE_DIR BIN_DIR); 274 275 GetSystemDirectory(tmp, sizeof(tmp)); 276 strcat(library_path, ";"); 277 strcat(library_path, tmp); 278 279 GetWindowsDirectory(tmp, sizeof(tmp)); 280 strcat(library_path, ";"); 281 strcat(library_path, tmp); 282 283 if (path_str) { 284 strcat(library_path, ";"); 285 strcat(library_path, path_str); 286 } 287 288 strcat(library_path, ";."); 289 290 Arguments::set_library_path(library_path); 291 FREE_C_HEAP_ARRAY(char, library_path); 292 } 293 294 // Default extensions directory 295 { 296 char path[MAX_PATH]; 297 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 298 GetWindowsDirectory(path, MAX_PATH); 299 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 300 path, PACKAGE_DIR, EXT_DIR); 301 Arguments::set_ext_dirs(buf); 302 } 303 #undef EXT_DIR 304 #undef BIN_DIR 305 #undef PACKAGE_DIR 306 307 #ifndef _WIN64 308 // set our UnhandledExceptionFilter and save any previous one 309 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception); 310 #endif 311 312 // Done 313 return; 314 } 315 316 void os::breakpoint() { 317 DebugBreak(); 318 } 319 320 // Invoked from the BREAKPOINT Macro 321 extern "C" void breakpoint() { 322 os::breakpoint(); 323 } 324 325 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP. 326 // So far, this method is only used by Native Memory Tracking, which is 327 // only supported on Windows XP or later. 328 // 329 int os::get_native_stack(address* stack, int frames, int toSkip) { 330 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL); 331 for (int index = captured; index < frames; index ++) { 332 stack[index] = NULL; 333 } 334 return captured; 335 } 336 337 338 // os::current_stack_base() 339 // 340 // Returns the base of the stack, which is the stack's 341 // starting address. This function must be called 342 // while running on the stack of the thread being queried. 343 344 address os::current_stack_base() { 345 MEMORY_BASIC_INFORMATION minfo; 346 address stack_bottom; 347 size_t stack_size; 348 349 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 350 stack_bottom = (address)minfo.AllocationBase; 351 stack_size = minfo.RegionSize; 352 353 // Add up the sizes of all the regions with the same 354 // AllocationBase. 355 while (1) { 356 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 357 if (stack_bottom == (address)minfo.AllocationBase) { 358 stack_size += minfo.RegionSize; 359 } else { 360 break; 361 } 362 } 363 return stack_bottom + stack_size; 364 } 365 366 size_t os::current_stack_size() { 367 size_t sz; 368 MEMORY_BASIC_INFORMATION minfo; 369 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 370 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 371 return sz; 372 } 373 374 bool os::committed_in_range(address start, size_t size, address& committed_start, size_t& committed_size) { 375 MEMORY_BASIC_INFORMATION minfo; 376 committed_start = NULL; 377 committed_size = 0; 378 address top = start + size; 379 const address start_addr = start; 380 while (start < top) { 381 VirtualQuery(start, &minfo, sizeof(minfo)); 382 if ((minfo.State & MEM_COMMIT) == 0) { // not committed 383 if (committed_start != NULL) { 384 break; 385 } 386 } else { // committed 387 if (committed_start == NULL) { 388 committed_start = start; 389 } 390 size_t offset = start - (address)minfo.BaseAddress; 391 committed_size += minfo.RegionSize - offset; 392 } 393 start = (address)minfo.BaseAddress + minfo.RegionSize; 394 } 395 396 if (committed_start == NULL) { 397 assert(committed_size == 0, "Sanity"); 398 return false; 399 } else { 400 assert(committed_start >= start_addr && committed_start < top, "Out of range"); 401 // current region may go beyond the limit, trim to the limit 402 committed_size = MIN2(committed_size, size_t(top - committed_start)); 403 return true; 404 } 405 } 406 407 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 408 const struct tm* time_struct_ptr = localtime(clock); 409 if (time_struct_ptr != NULL) { 410 *res = *time_struct_ptr; 411 return res; 412 } 413 return NULL; 414 } 415 416 struct tm* os::gmtime_pd(const time_t* clock, struct tm* res) { 417 const struct tm* time_struct_ptr = gmtime(clock); 418 if (time_struct_ptr != NULL) { 419 *res = *time_struct_ptr; 420 return res; 421 } 422 return NULL; 423 } 424 425 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 426 427 // Thread start routine for all newly created threads 428 static unsigned __stdcall thread_native_entry(Thread* thread) { 429 430 thread->record_stack_base_and_size(); 431 432 // Try to randomize the cache line index of hot stack frames. 433 // This helps when threads of the same stack traces evict each other's 434 // cache lines. The threads can be either from the same JVM instance, or 435 // from different JVM instances. The benefit is especially true for 436 // processors with hyperthreading technology. 437 static int counter = 0; 438 int pid = os::current_process_id(); 439 _alloca(((pid ^ counter++) & 7) * 128); 440 441 thread->initialize_thread_current(); 442 443 OSThread* osthr = thread->osthread(); 444 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 445 446 if (UseNUMA) { 447 int lgrp_id = os::numa_get_group_id(); 448 if (lgrp_id != -1) { 449 thread->set_lgrp_id(lgrp_id); 450 } 451 } 452 453 // Diagnostic code to investigate JDK-6573254 454 int res = 30115; // non-java thread 455 if (thread->is_Java_thread()) { 456 res = 20115; // java thread 457 } 458 459 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id()); 460 461 // Install a win32 structured exception handler around every thread created 462 // by VM, so VM can generate error dump when an exception occurred in non- 463 // Java thread (e.g. VM thread). 464 __try { 465 thread->call_run(); 466 } __except(topLevelExceptionFilter( 467 (_EXCEPTION_POINTERS*)_exception_info())) { 468 // Nothing to do. 469 } 470 471 // Note: at this point the thread object may already have deleted itself. 472 // Do not dereference it from here on out. 473 474 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); 475 476 // One less thread is executing 477 // When the VMThread gets here, the main thread may have already exited 478 // which frees the CodeHeap containing the Atomic::add code 479 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 480 Atomic::dec(&os::win32::_os_thread_count); 481 } 482 483 // Thread must not return from exit_process_or_thread(), but if it does, 484 // let it proceed to exit normally 485 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res); 486 } 487 488 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, 489 int thread_id) { 490 // Allocate the OSThread object 491 OSThread* osthread = new OSThread(NULL, NULL); 492 if (osthread == NULL) return NULL; 493 494 // Initialize the JDK library's interrupt event. 495 // This should really be done when OSThread is constructed, 496 // but there is no way for a constructor to report failure to 497 // allocate the event. 498 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 499 if (interrupt_event == NULL) { 500 delete osthread; 501 return NULL; 502 } 503 osthread->set_interrupt_event(interrupt_event); 504 505 // Store info on the Win32 thread into the OSThread 506 osthread->set_thread_handle(thread_handle); 507 osthread->set_thread_id(thread_id); 508 509 if (UseNUMA) { 510 int lgrp_id = os::numa_get_group_id(); 511 if (lgrp_id != -1) { 512 thread->set_lgrp_id(lgrp_id); 513 } 514 } 515 516 // Initial thread state is INITIALIZED, not SUSPENDED 517 osthread->set_state(INITIALIZED); 518 519 return osthread; 520 } 521 522 523 bool os::create_attached_thread(JavaThread* thread) { 524 #ifdef ASSERT 525 thread->verify_not_published(); 526 #endif 527 HANDLE thread_h; 528 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 529 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 530 fatal("DuplicateHandle failed\n"); 531 } 532 OSThread* osthread = create_os_thread(thread, thread_h, 533 (int)current_thread_id()); 534 if (osthread == NULL) { 535 return false; 536 } 537 538 // Initial thread state is RUNNABLE 539 osthread->set_state(RUNNABLE); 540 541 thread->set_osthread(osthread); 542 543 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", 544 os::current_thread_id()); 545 546 return true; 547 } 548 549 bool os::create_main_thread(JavaThread* thread) { 550 #ifdef ASSERT 551 thread->verify_not_published(); 552 #endif 553 if (_starting_thread == NULL) { 554 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 555 if (_starting_thread == NULL) { 556 return false; 557 } 558 } 559 560 // The primordial thread is runnable from the start) 561 _starting_thread->set_state(RUNNABLE); 562 563 thread->set_osthread(_starting_thread); 564 return true; 565 } 566 567 // Helper function to trace _beginthreadex attributes, 568 // similar to os::Posix::describe_pthread_attr() 569 static char* describe_beginthreadex_attributes(char* buf, size_t buflen, 570 size_t stacksize, unsigned initflag) { 571 stringStream ss(buf, buflen); 572 if (stacksize == 0) { 573 ss.print("stacksize: default, "); 574 } else { 575 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); 576 } 577 ss.print("flags: "); 578 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " "); 579 #define ALL(X) \ 580 X(CREATE_SUSPENDED) \ 581 X(STACK_SIZE_PARAM_IS_A_RESERVATION) 582 ALL(PRINT_FLAG) 583 #undef ALL 584 #undef PRINT_FLAG 585 return buf; 586 } 587 588 // Allocate and initialize a new OSThread 589 bool os::create_thread(Thread* thread, ThreadType thr_type, 590 size_t stack_size) { 591 unsigned thread_id; 592 593 // Allocate the OSThread object 594 OSThread* osthread = new OSThread(NULL, NULL); 595 if (osthread == NULL) { 596 return false; 597 } 598 599 // Initialize the JDK library's interrupt event. 600 // This should really be done when OSThread is constructed, 601 // but there is no way for a constructor to report failure to 602 // allocate the event. 603 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 604 if (interrupt_event == NULL) { 605 delete osthread; 606 return false; 607 } 608 osthread->set_interrupt_event(interrupt_event); 609 // We don't call set_interrupted(false) as it will trip the assert in there 610 // as we are not operating on the current thread. We don't need to call it 611 // because the initial state is already correct. 612 613 thread->set_osthread(osthread); 614 615 if (stack_size == 0) { 616 switch (thr_type) { 617 case os::java_thread: 618 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 619 if (JavaThread::stack_size_at_create() > 0) { 620 stack_size = JavaThread::stack_size_at_create(); 621 } 622 break; 623 case os::compiler_thread: 624 if (CompilerThreadStackSize > 0) { 625 stack_size = (size_t)(CompilerThreadStackSize * K); 626 break; 627 } // else fall through: 628 // use VMThreadStackSize if CompilerThreadStackSize is not defined 629 case os::vm_thread: 630 case os::pgc_thread: 631 case os::cgc_thread: 632 case os::watcher_thread: 633 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 634 break; 635 } 636 } 637 638 // Create the Win32 thread 639 // 640 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 641 // does not specify stack size. Instead, it specifies the size of 642 // initially committed space. The stack size is determined by 643 // PE header in the executable. If the committed "stack_size" is larger 644 // than default value in the PE header, the stack is rounded up to the 645 // nearest multiple of 1MB. For example if the launcher has default 646 // stack size of 320k, specifying any size less than 320k does not 647 // affect the actual stack size at all, it only affects the initial 648 // commitment. On the other hand, specifying 'stack_size' larger than 649 // default value may cause significant increase in memory usage, because 650 // not only the stack space will be rounded up to MB, but also the 651 // entire space is committed upfront. 652 // 653 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 654 // for CreateThread() that can treat 'stack_size' as stack size. However we 655 // are not supposed to call CreateThread() directly according to MSDN 656 // document because JVM uses C runtime library. The good news is that the 657 // flag appears to work with _beginthredex() as well. 658 659 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION; 660 HANDLE thread_handle = 661 (HANDLE)_beginthreadex(NULL, 662 (unsigned)stack_size, 663 (unsigned (__stdcall *)(void*)) thread_native_entry, 664 thread, 665 initflag, 666 &thread_id); 667 668 char buf[64]; 669 if (thread_handle != NULL) { 670 log_info(os, thread)("Thread started (tid: %u, attributes: %s)", 671 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag)); 672 } else { 673 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.", 674 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag)); 675 // Log some OS information which might explain why creating the thread failed. 676 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads()); 677 LogStream st(Log(os, thread)::info()); 678 os::print_memory_info(&st); 679 } 680 681 if (thread_handle == NULL) { 682 // Need to clean up stuff we've allocated so far 683 thread->set_osthread(NULL); 684 delete osthread; 685 return false; 686 } 687 688 Atomic::inc(&os::win32::_os_thread_count); 689 690 // Store info on the Win32 thread into the OSThread 691 osthread->set_thread_handle(thread_handle); 692 osthread->set_thread_id(thread_id); 693 694 // Initial thread state is INITIALIZED, not SUSPENDED 695 osthread->set_state(INITIALIZED); 696 697 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 698 return true; 699 } 700 701 702 // Free Win32 resources related to the OSThread 703 void os::free_thread(OSThread* osthread) { 704 assert(osthread != NULL, "osthread not set"); 705 706 // We are told to free resources of the argument thread, 707 // but we can only really operate on the current thread. 708 assert(Thread::current()->osthread() == osthread, 709 "os::free_thread but not current thread"); 710 711 CloseHandle(osthread->thread_handle()); 712 delete osthread; 713 } 714 715 static jlong first_filetime; 716 static jlong initial_performance_count; 717 static jlong performance_frequency; 718 719 720 jlong as_long(LARGE_INTEGER x) { 721 jlong result = 0; // initialization to avoid warning 722 set_high(&result, x.HighPart); 723 set_low(&result, x.LowPart); 724 return result; 725 } 726 727 728 jlong os::elapsed_counter() { 729 LARGE_INTEGER count; 730 QueryPerformanceCounter(&count); 731 return as_long(count) - initial_performance_count; 732 } 733 734 735 jlong os::elapsed_frequency() { 736 return performance_frequency; 737 } 738 739 740 julong os::available_memory() { 741 return win32::available_memory(); 742 } 743 744 julong os::win32::available_memory() { 745 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 746 // value if total memory is larger than 4GB 747 MEMORYSTATUSEX ms; 748 ms.dwLength = sizeof(ms); 749 GlobalMemoryStatusEx(&ms); 750 751 return (julong)ms.ullAvailPhys; 752 } 753 754 julong os::physical_memory() { 755 return win32::physical_memory(); 756 } 757 758 bool os::has_allocatable_memory_limit(julong* limit) { 759 MEMORYSTATUSEX ms; 760 ms.dwLength = sizeof(ms); 761 GlobalMemoryStatusEx(&ms); 762 #ifdef _LP64 763 *limit = (julong)ms.ullAvailVirtual; 764 return true; 765 #else 766 // Limit to 1400m because of the 2gb address space wall 767 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual); 768 return true; 769 #endif 770 } 771 772 int os::active_processor_count() { 773 // User has overridden the number of active processors 774 if (ActiveProcessorCount > 0) { 775 log_trace(os)("active_processor_count: " 776 "active processor count set by user : %d", 777 ActiveProcessorCount); 778 return ActiveProcessorCount; 779 } 780 781 DWORD_PTR lpProcessAffinityMask = 0; 782 DWORD_PTR lpSystemAffinityMask = 0; 783 int proc_count = processor_count(); 784 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 785 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 786 // Nof active processors is number of bits in process affinity mask 787 int bitcount = 0; 788 while (lpProcessAffinityMask != 0) { 789 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 790 bitcount++; 791 } 792 return bitcount; 793 } else { 794 return proc_count; 795 } 796 } 797 798 void os::set_native_thread_name(const char *name) { 799 800 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx 801 // 802 // Note that unfortunately this only works if the process 803 // is already attached to a debugger; debugger must observe 804 // the exception below to show the correct name. 805 806 // If there is no debugger attached skip raising the exception 807 if (!IsDebuggerPresent()) { 808 return; 809 } 810 811 const DWORD MS_VC_EXCEPTION = 0x406D1388; 812 struct { 813 DWORD dwType; // must be 0x1000 814 LPCSTR szName; // pointer to name (in user addr space) 815 DWORD dwThreadID; // thread ID (-1=caller thread) 816 DWORD dwFlags; // reserved for future use, must be zero 817 } info; 818 819 info.dwType = 0x1000; 820 info.szName = name; 821 info.dwThreadID = -1; 822 info.dwFlags = 0; 823 824 __try { 825 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info ); 826 } __except(EXCEPTION_EXECUTE_HANDLER) {} 827 } 828 829 bool os::distribute_processes(uint length, uint* distribution) { 830 // Not yet implemented. 831 return false; 832 } 833 834 bool os::bind_to_processor(uint processor_id) { 835 // Not yet implemented. 836 return false; 837 } 838 839 void os::win32::initialize_performance_counter() { 840 LARGE_INTEGER count; 841 QueryPerformanceFrequency(&count); 842 performance_frequency = as_long(count); 843 QueryPerformanceCounter(&count); 844 initial_performance_count = as_long(count); 845 } 846 847 848 double os::elapsedTime() { 849 return (double) elapsed_counter() / (double) elapsed_frequency(); 850 } 851 852 853 // Windows format: 854 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 855 // Java format: 856 // Java standards require the number of milliseconds since 1/1/1970 857 858 // Constant offset - calculated using offset() 859 static jlong _offset = 116444736000000000; 860 // Fake time counter for reproducible results when debugging 861 static jlong fake_time = 0; 862 863 #ifdef ASSERT 864 // Just to be safe, recalculate the offset in debug mode 865 static jlong _calculated_offset = 0; 866 static int _has_calculated_offset = 0; 867 868 jlong offset() { 869 if (_has_calculated_offset) return _calculated_offset; 870 SYSTEMTIME java_origin; 871 java_origin.wYear = 1970; 872 java_origin.wMonth = 1; 873 java_origin.wDayOfWeek = 0; // ignored 874 java_origin.wDay = 1; 875 java_origin.wHour = 0; 876 java_origin.wMinute = 0; 877 java_origin.wSecond = 0; 878 java_origin.wMilliseconds = 0; 879 FILETIME jot; 880 if (!SystemTimeToFileTime(&java_origin, &jot)) { 881 fatal("Error = %d\nWindows error", GetLastError()); 882 } 883 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 884 _has_calculated_offset = 1; 885 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 886 return _calculated_offset; 887 } 888 #else 889 jlong offset() { 890 return _offset; 891 } 892 #endif 893 894 jlong windows_to_java_time(FILETIME wt) { 895 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 896 return (a - offset()) / 10000; 897 } 898 899 // Returns time ticks in (10th of micro seconds) 900 jlong windows_to_time_ticks(FILETIME wt) { 901 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 902 return (a - offset()); 903 } 904 905 FILETIME java_to_windows_time(jlong l) { 906 jlong a = (l * 10000) + offset(); 907 FILETIME result; 908 result.dwHighDateTime = high(a); 909 result.dwLowDateTime = low(a); 910 return result; 911 } 912 913 bool os::supports_vtime() { return true; } 914 bool os::enable_vtime() { return false; } 915 bool os::vtime_enabled() { return false; } 916 917 double os::elapsedVTime() { 918 FILETIME created; 919 FILETIME exited; 920 FILETIME kernel; 921 FILETIME user; 922 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) { 923 // the resolution of windows_to_java_time() should be sufficient (ms) 924 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS; 925 } else { 926 return elapsedTime(); 927 } 928 } 929 930 jlong os::javaTimeMillis() { 931 FILETIME wt; 932 GetSystemTimeAsFileTime(&wt); 933 return windows_to_java_time(wt); 934 } 935 936 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 937 FILETIME wt; 938 GetSystemTimeAsFileTime(&wt); 939 jlong ticks = windows_to_time_ticks(wt); // 10th of micros 940 jlong secs = jlong(ticks / 10000000); // 10000 * 1000 941 seconds = secs; 942 nanos = jlong(ticks - (secs*10000000)) * 100; 943 } 944 945 jlong os::javaTimeNanos() { 946 LARGE_INTEGER current_count; 947 QueryPerformanceCounter(¤t_count); 948 double current = as_long(current_count); 949 double freq = performance_frequency; 950 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC); 951 return time; 952 } 953 954 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 955 jlong freq = performance_frequency; 956 if (freq < NANOSECS_PER_SEC) { 957 // the performance counter is 64 bits and we will 958 // be multiplying it -- so no wrap in 64 bits 959 info_ptr->max_value = ALL_64_BITS; 960 } else if (freq > NANOSECS_PER_SEC) { 961 // use the max value the counter can reach to 962 // determine the max value which could be returned 963 julong max_counter = (julong)ALL_64_BITS; 964 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC)); 965 } else { 966 // the performance counter is 64 bits and we will 967 // be using it directly -- so no wrap in 64 bits 968 info_ptr->max_value = ALL_64_BITS; 969 } 970 971 // using a counter, so no skipping 972 info_ptr->may_skip_backward = false; 973 info_ptr->may_skip_forward = false; 974 975 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 976 } 977 978 char* os::local_time_string(char *buf, size_t buflen) { 979 SYSTEMTIME st; 980 GetLocalTime(&st); 981 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 982 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 983 return buf; 984 } 985 986 bool os::getTimesSecs(double* process_real_time, 987 double* process_user_time, 988 double* process_system_time) { 989 HANDLE h_process = GetCurrentProcess(); 990 FILETIME create_time, exit_time, kernel_time, user_time; 991 BOOL result = GetProcessTimes(h_process, 992 &create_time, 993 &exit_time, 994 &kernel_time, 995 &user_time); 996 if (result != 0) { 997 FILETIME wt; 998 GetSystemTimeAsFileTime(&wt); 999 jlong rtc_millis = windows_to_java_time(wt); 1000 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 1001 *process_user_time = 1002 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS); 1003 *process_system_time = 1004 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS); 1005 return true; 1006 } else { 1007 return false; 1008 } 1009 } 1010 1011 void os::shutdown() { 1012 // allow PerfMemory to attempt cleanup of any persistent resources 1013 perfMemory_exit(); 1014 1015 // flush buffered output, finish log files 1016 ostream_abort(); 1017 1018 // Check for abort hook 1019 abort_hook_t abort_hook = Arguments::abort_hook(); 1020 if (abort_hook != NULL) { 1021 abort_hook(); 1022 } 1023 } 1024 1025 1026 static HANDLE dumpFile = NULL; 1027 1028 // Check if dump file can be created. 1029 void os::check_dump_limit(char* buffer, size_t buffsz) { 1030 bool status = true; 1031 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) { 1032 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line"); 1033 status = false; 1034 } 1035 1036 #ifndef ASSERT 1037 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) { 1038 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows"); 1039 status = false; 1040 } 1041 #endif 1042 1043 if (status) { 1044 const char* cwd = get_current_directory(NULL, 0); 1045 int pid = current_process_id(); 1046 if (cwd != NULL) { 1047 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid); 1048 } else { 1049 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid); 1050 } 1051 1052 if (dumpFile == NULL && 1053 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL)) 1054 == INVALID_HANDLE_VALUE) { 1055 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError()); 1056 status = false; 1057 } 1058 } 1059 VMError::record_coredump_status(buffer, status); 1060 } 1061 1062 void os::abort(bool dump_core, void* siginfo, const void* context) { 1063 EXCEPTION_POINTERS ep; 1064 MINIDUMP_EXCEPTION_INFORMATION mei; 1065 MINIDUMP_EXCEPTION_INFORMATION* pmei; 1066 1067 HANDLE hProcess = GetCurrentProcess(); 1068 DWORD processId = GetCurrentProcessId(); 1069 MINIDUMP_TYPE dumpType; 1070 1071 shutdown(); 1072 if (!dump_core || dumpFile == NULL) { 1073 if (dumpFile != NULL) { 1074 CloseHandle(dumpFile); 1075 } 1076 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1077 } 1078 1079 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData | 1080 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules); 1081 1082 if (siginfo != NULL && context != NULL) { 1083 ep.ContextRecord = (PCONTEXT) context; 1084 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo; 1085 1086 mei.ThreadId = GetCurrentThreadId(); 1087 mei.ExceptionPointers = &ep; 1088 pmei = &mei; 1089 } else { 1090 pmei = NULL; 1091 } 1092 1093 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all 1094 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then. 1095 if (!WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) && 1096 !WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL)) { 1097 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError()); 1098 } 1099 CloseHandle(dumpFile); 1100 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1101 } 1102 1103 // Die immediately, no exit hook, no abort hook, no cleanup. 1104 void os::die() { 1105 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1); 1106 } 1107 1108 // Directory routines copied from src/win32/native/java/io/dirent_md.c 1109 // * dirent_md.c 1.15 00/02/02 1110 // 1111 // The declarations for DIR and struct dirent are in jvm_win32.h. 1112 1113 // Caller must have already run dirname through JVM_NativePath, which removes 1114 // duplicate slashes and converts all instances of '/' into '\\'. 1115 1116 DIR * os::opendir(const char *dirname) { 1117 assert(dirname != NULL, "just checking"); // hotspot change 1118 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal); 1119 DWORD fattr; // hotspot change 1120 char alt_dirname[4] = { 0, 0, 0, 0 }; 1121 1122 if (dirp == 0) { 1123 errno = ENOMEM; 1124 return 0; 1125 } 1126 1127 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it 1128 // as a directory in FindFirstFile(). We detect this case here and 1129 // prepend the current drive name. 1130 // 1131 if (dirname[1] == '\0' && dirname[0] == '\\') { 1132 alt_dirname[0] = _getdrive() + 'A' - 1; 1133 alt_dirname[1] = ':'; 1134 alt_dirname[2] = '\\'; 1135 alt_dirname[3] = '\0'; 1136 dirname = alt_dirname; 1137 } 1138 1139 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal); 1140 if (dirp->path == 0) { 1141 free(dirp); 1142 errno = ENOMEM; 1143 return 0; 1144 } 1145 strcpy(dirp->path, dirname); 1146 1147 fattr = GetFileAttributes(dirp->path); 1148 if (fattr == 0xffffffff) { 1149 free(dirp->path); 1150 free(dirp); 1151 errno = ENOENT; 1152 return 0; 1153 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 1154 free(dirp->path); 1155 free(dirp); 1156 errno = ENOTDIR; 1157 return 0; 1158 } 1159 1160 // Append "*.*", or possibly "\\*.*", to path 1161 if (dirp->path[1] == ':' && 1162 (dirp->path[2] == '\0' || 1163 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 1164 // No '\\' needed for cases like "Z:" or "Z:\" 1165 strcat(dirp->path, "*.*"); 1166 } else { 1167 strcat(dirp->path, "\\*.*"); 1168 } 1169 1170 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 1171 if (dirp->handle == INVALID_HANDLE_VALUE) { 1172 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 1173 free(dirp->path); 1174 free(dirp); 1175 errno = EACCES; 1176 return 0; 1177 } 1178 } 1179 return dirp; 1180 } 1181 1182 struct dirent * os::readdir(DIR *dirp) { 1183 assert(dirp != NULL, "just checking"); // hotspot change 1184 if (dirp->handle == INVALID_HANDLE_VALUE) { 1185 return NULL; 1186 } 1187 1188 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 1189 1190 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 1191 if (GetLastError() == ERROR_INVALID_HANDLE) { 1192 errno = EBADF; 1193 return NULL; 1194 } 1195 FindClose(dirp->handle); 1196 dirp->handle = INVALID_HANDLE_VALUE; 1197 } 1198 1199 return &dirp->dirent; 1200 } 1201 1202 int os::closedir(DIR *dirp) { 1203 assert(dirp != NULL, "just checking"); // hotspot change 1204 if (dirp->handle != INVALID_HANDLE_VALUE) { 1205 if (!FindClose(dirp->handle)) { 1206 errno = EBADF; 1207 return -1; 1208 } 1209 dirp->handle = INVALID_HANDLE_VALUE; 1210 } 1211 free(dirp->path); 1212 free(dirp); 1213 return 0; 1214 } 1215 1216 // This must be hard coded because it's the system's temporary 1217 // directory not the java application's temp directory, ala java.io.tmpdir. 1218 const char* os::get_temp_directory() { 1219 static char path_buf[MAX_PATH]; 1220 if (GetTempPath(MAX_PATH, path_buf) > 0) { 1221 return path_buf; 1222 } else { 1223 path_buf[0] = '\0'; 1224 return path_buf; 1225 } 1226 } 1227 1228 // Needs to be in os specific directory because windows requires another 1229 // header file <direct.h> 1230 const char* os::get_current_directory(char *buf, size_t buflen) { 1231 int n = static_cast<int>(buflen); 1232 if (buflen > INT_MAX) n = INT_MAX; 1233 return _getcwd(buf, n); 1234 } 1235 1236 //----------------------------------------------------------- 1237 // Helper functions for fatal error handler 1238 #ifdef _WIN64 1239 // Helper routine which returns true if address in 1240 // within the NTDLL address space. 1241 // 1242 static bool _addr_in_ntdll(address addr) { 1243 HMODULE hmod; 1244 MODULEINFO minfo; 1245 1246 hmod = GetModuleHandle("NTDLL.DLL"); 1247 if (hmod == NULL) return false; 1248 if (!GetModuleInformation(GetCurrentProcess(), hmod, 1249 &minfo, sizeof(MODULEINFO))) { 1250 return false; 1251 } 1252 1253 if ((addr >= minfo.lpBaseOfDll) && 1254 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) { 1255 return true; 1256 } else { 1257 return false; 1258 } 1259 } 1260 #endif 1261 1262 struct _modinfo { 1263 address addr; 1264 char* full_path; // point to a char buffer 1265 int buflen; // size of the buffer 1266 address base_addr; 1267 }; 1268 1269 static int _locate_module_by_addr(const char * mod_fname, address base_addr, 1270 address top_address, void * param) { 1271 struct _modinfo *pmod = (struct _modinfo *)param; 1272 if (!pmod) return -1; 1273 1274 if (base_addr <= pmod->addr && 1275 top_address > pmod->addr) { 1276 // if a buffer is provided, copy path name to the buffer 1277 if (pmod->full_path) { 1278 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1279 } 1280 pmod->base_addr = base_addr; 1281 return 1; 1282 } 1283 return 0; 1284 } 1285 1286 bool os::dll_address_to_library_name(address addr, char* buf, 1287 int buflen, int* offset) { 1288 // buf is not optional, but offset is optional 1289 assert(buf != NULL, "sanity check"); 1290 1291 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1292 // return the full path to the DLL file, sometimes it returns path 1293 // to the corresponding PDB file (debug info); sometimes it only 1294 // returns partial path, which makes life painful. 1295 1296 struct _modinfo mi; 1297 mi.addr = addr; 1298 mi.full_path = buf; 1299 mi.buflen = buflen; 1300 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) { 1301 // buf already contains path name 1302 if (offset) *offset = addr - mi.base_addr; 1303 return true; 1304 } 1305 1306 buf[0] = '\0'; 1307 if (offset) *offset = -1; 1308 return false; 1309 } 1310 1311 bool os::dll_address_to_function_name(address addr, char *buf, 1312 int buflen, int *offset, 1313 bool demangle) { 1314 // buf is not optional, but offset is optional 1315 assert(buf != NULL, "sanity check"); 1316 1317 if (Decoder::decode(addr, buf, buflen, offset, demangle)) { 1318 return true; 1319 } 1320 if (offset != NULL) *offset = -1; 1321 buf[0] = '\0'; 1322 return false; 1323 } 1324 1325 // save the start and end address of jvm.dll into param[0] and param[1] 1326 static int _locate_jvm_dll(const char* mod_fname, address base_addr, 1327 address top_address, void * param) { 1328 if (!param) return -1; 1329 1330 if (base_addr <= (address)_locate_jvm_dll && 1331 top_address > (address)_locate_jvm_dll) { 1332 ((address*)param)[0] = base_addr; 1333 ((address*)param)[1] = top_address; 1334 return 1; 1335 } 1336 return 0; 1337 } 1338 1339 address vm_lib_location[2]; // start and end address of jvm.dll 1340 1341 // check if addr is inside jvm.dll 1342 bool os::address_is_in_vm(address addr) { 1343 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1344 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) { 1345 assert(false, "Can't find jvm module."); 1346 return false; 1347 } 1348 } 1349 1350 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1351 } 1352 1353 // print module info; param is outputStream* 1354 static int _print_module(const char* fname, address base_address, 1355 address top_address, void* param) { 1356 if (!param) return -1; 1357 1358 outputStream* st = (outputStream*)param; 1359 1360 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname); 1361 return 0; 1362 } 1363 1364 // Loads .dll/.so and 1365 // in case of error it checks if .dll/.so was built for the 1366 // same architecture as Hotspot is running on 1367 void * os::dll_load(const char *name, char *ebuf, int ebuflen) { 1368 log_info(os)("attempting shared library load of %s", name); 1369 1370 void * result = LoadLibrary(name); 1371 if (result != NULL) { 1372 Events::log(NULL, "Loaded shared library %s", name); 1373 // Recalculate pdb search path if a DLL was loaded successfully. 1374 SymbolEngine::recalc_search_path(); 1375 log_info(os)("shared library load of %s was successful", name); 1376 return result; 1377 } 1378 DWORD errcode = GetLastError(); 1379 // Read system error message into ebuf 1380 // It may or may not be overwritten below (in the for loop and just above) 1381 lasterror(ebuf, (size_t) ebuflen); 1382 ebuf[ebuflen - 1] = '\0'; 1383 Events::log(NULL, "Loading shared library %s failed, error code %lu", name, errcode); 1384 log_info(os)("shared library load of %s failed, error code %lu", name, errcode); 1385 1386 if (errcode == ERROR_MOD_NOT_FOUND) { 1387 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1); 1388 ebuf[ebuflen - 1] = '\0'; 1389 return NULL; 1390 } 1391 1392 // Parsing dll below 1393 // If we can read dll-info and find that dll was built 1394 // for an architecture other than Hotspot is running in 1395 // - then print to buffer "DLL was built for a different architecture" 1396 // else call os::lasterror to obtain system error message 1397 int fd = ::open(name, O_RDONLY | O_BINARY, 0); 1398 if (fd < 0) { 1399 return NULL; 1400 } 1401 1402 uint32_t signature_offset; 1403 uint16_t lib_arch = 0; 1404 bool failed_to_get_lib_arch = 1405 ( // Go to position 3c in the dll 1406 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0) 1407 || 1408 // Read location of signature 1409 (sizeof(signature_offset) != 1410 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset)))) 1411 || 1412 // Go to COFF File Header in dll 1413 // that is located after "signature" (4 bytes long) 1414 (os::seek_to_file_offset(fd, 1415 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0) 1416 || 1417 // Read field that contains code of architecture 1418 // that dll was built for 1419 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch)))) 1420 ); 1421 1422 ::close(fd); 1423 if (failed_to_get_lib_arch) { 1424 // file i/o error - report os::lasterror(...) msg 1425 return NULL; 1426 } 1427 1428 typedef struct { 1429 uint16_t arch_code; 1430 char* arch_name; 1431 } arch_t; 1432 1433 static const arch_t arch_array[] = { 1434 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1435 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"} 1436 }; 1437 #if (defined _M_AMD64) 1438 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64; 1439 #elif (defined _M_IX86) 1440 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386; 1441 #else 1442 #error Method os::dll_load requires that one of following \ 1443 is defined :_M_AMD64 or _M_IX86 1444 #endif 1445 1446 1447 // Obtain a string for printf operation 1448 // lib_arch_str shall contain string what platform this .dll was built for 1449 // running_arch_str shall string contain what platform Hotspot was built for 1450 char *running_arch_str = NULL, *lib_arch_str = NULL; 1451 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) { 1452 if (lib_arch == arch_array[i].arch_code) { 1453 lib_arch_str = arch_array[i].arch_name; 1454 } 1455 if (running_arch == arch_array[i].arch_code) { 1456 running_arch_str = arch_array[i].arch_name; 1457 } 1458 } 1459 1460 assert(running_arch_str, 1461 "Didn't find running architecture code in arch_array"); 1462 1463 // If the architecture is right 1464 // but some other error took place - report os::lasterror(...) msg 1465 if (lib_arch == running_arch) { 1466 return NULL; 1467 } 1468 1469 if (lib_arch_str != NULL) { 1470 ::_snprintf(ebuf, ebuflen - 1, 1471 "Can't load %s-bit .dll on a %s-bit platform", 1472 lib_arch_str, running_arch_str); 1473 } else { 1474 // don't know what architecture this dll was build for 1475 ::_snprintf(ebuf, ebuflen - 1, 1476 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1477 lib_arch, running_arch_str); 1478 } 1479 1480 return NULL; 1481 } 1482 1483 void os::print_dll_info(outputStream *st) { 1484 st->print_cr("Dynamic libraries:"); 1485 get_loaded_modules_info(_print_module, (void *)st); 1486 } 1487 1488 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1489 HANDLE hProcess; 1490 1491 # define MAX_NUM_MODULES 128 1492 HMODULE modules[MAX_NUM_MODULES]; 1493 static char filename[MAX_PATH]; 1494 int result = 0; 1495 1496 int pid = os::current_process_id(); 1497 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1498 FALSE, pid); 1499 if (hProcess == NULL) return 0; 1500 1501 DWORD size_needed; 1502 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) { 1503 CloseHandle(hProcess); 1504 return 0; 1505 } 1506 1507 // number of modules that are currently loaded 1508 int num_modules = size_needed / sizeof(HMODULE); 1509 1510 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1511 // Get Full pathname: 1512 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) { 1513 filename[0] = '\0'; 1514 } 1515 1516 MODULEINFO modinfo; 1517 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) { 1518 modinfo.lpBaseOfDll = NULL; 1519 modinfo.SizeOfImage = 0; 1520 } 1521 1522 // Invoke callback function 1523 result = callback(filename, (address)modinfo.lpBaseOfDll, 1524 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param); 1525 if (result) break; 1526 } 1527 1528 CloseHandle(hProcess); 1529 return result; 1530 } 1531 1532 bool os::get_host_name(char* buf, size_t buflen) { 1533 DWORD size = (DWORD)buflen; 1534 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE); 1535 } 1536 1537 void os::get_summary_os_info(char* buf, size_t buflen) { 1538 stringStream sst(buf, buflen); 1539 os::win32::print_windows_version(&sst); 1540 // chop off newline character 1541 char* nl = strchr(buf, '\n'); 1542 if (nl != NULL) *nl = '\0'; 1543 } 1544 1545 int os::vsnprintf(char* buf, size_t len, const char* fmt, va_list args) { 1546 #if _MSC_VER >= 1900 1547 // Starting with Visual Studio 2015, vsnprint is C99 compliant. 1548 int result = ::vsnprintf(buf, len, fmt, args); 1549 // If an encoding error occurred (result < 0) then it's not clear 1550 // whether the buffer is NUL terminated, so ensure it is. 1551 if ((result < 0) && (len > 0)) { 1552 buf[len - 1] = '\0'; 1553 } 1554 return result; 1555 #else 1556 // Before Visual Studio 2015, vsnprintf is not C99 compliant, so use 1557 // _vsnprintf, whose behavior seems to be *mostly* consistent across 1558 // versions. However, when len == 0, avoid _vsnprintf too, and just 1559 // go straight to _vscprintf. The output is going to be truncated in 1560 // that case, except in the unusual case of empty output. More 1561 // importantly, the documentation for various versions of Visual Studio 1562 // are inconsistent about the behavior of _vsnprintf when len == 0, 1563 // including it possibly being an error. 1564 int result = -1; 1565 if (len > 0) { 1566 result = _vsnprintf(buf, len, fmt, args); 1567 // If output (including NUL terminator) is truncated, the buffer 1568 // won't be NUL terminated. Add the trailing NUL specified by C99. 1569 if ((result < 0) || ((size_t)result >= len)) { 1570 buf[len - 1] = '\0'; 1571 } 1572 } 1573 if (result < 0) { 1574 result = _vscprintf(fmt, args); 1575 } 1576 return result; 1577 #endif // _MSC_VER dispatch 1578 } 1579 1580 static inline time_t get_mtime(const char* filename) { 1581 struct stat st; 1582 int ret = os::stat(filename, &st); 1583 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno)); 1584 return st.st_mtime; 1585 } 1586 1587 int os::compare_file_modified_times(const char* file1, const char* file2) { 1588 time_t t1 = get_mtime(file1); 1589 time_t t2 = get_mtime(file2); 1590 return t1 - t2; 1591 } 1592 1593 void os::print_os_info_brief(outputStream* st) { 1594 os::print_os_info(st); 1595 } 1596 1597 void os::print_os_info(outputStream* st) { 1598 #ifdef ASSERT 1599 char buffer[1024]; 1600 st->print("HostName: "); 1601 if (get_host_name(buffer, sizeof(buffer))) { 1602 st->print("%s ", buffer); 1603 } else { 1604 st->print("N/A "); 1605 } 1606 #endif 1607 st->print("OS:"); 1608 os::win32::print_windows_version(st); 1609 1610 #ifdef _LP64 1611 VM_Version::print_platform_virtualization_info(st); 1612 #endif 1613 } 1614 1615 void os::win32::print_windows_version(outputStream* st) { 1616 OSVERSIONINFOEX osvi; 1617 VS_FIXEDFILEINFO *file_info; 1618 TCHAR kernel32_path[MAX_PATH]; 1619 UINT len, ret; 1620 1621 // Use the GetVersionEx information to see if we're on a server or 1622 // workstation edition of Windows. Starting with Windows 8.1 we can't 1623 // trust the OS version information returned by this API. 1624 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1625 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1626 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1627 st->print_cr("Call to GetVersionEx failed"); 1628 return; 1629 } 1630 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION); 1631 1632 // Get the full path to \Windows\System32\kernel32.dll and use that for 1633 // determining what version of Windows we're running on. 1634 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1; 1635 ret = GetSystemDirectory(kernel32_path, len); 1636 if (ret == 0 || ret > len) { 1637 st->print_cr("Call to GetSystemDirectory failed"); 1638 return; 1639 } 1640 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret); 1641 1642 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL); 1643 if (version_size == 0) { 1644 st->print_cr("Call to GetFileVersionInfoSize failed"); 1645 return; 1646 } 1647 1648 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal); 1649 if (version_info == NULL) { 1650 st->print_cr("Failed to allocate version_info"); 1651 return; 1652 } 1653 1654 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) { 1655 os::free(version_info); 1656 st->print_cr("Call to GetFileVersionInfo failed"); 1657 return; 1658 } 1659 1660 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) { 1661 os::free(version_info); 1662 st->print_cr("Call to VerQueryValue failed"); 1663 return; 1664 } 1665 1666 int major_version = HIWORD(file_info->dwProductVersionMS); 1667 int minor_version = LOWORD(file_info->dwProductVersionMS); 1668 int build_number = HIWORD(file_info->dwProductVersionLS); 1669 int build_minor = LOWORD(file_info->dwProductVersionLS); 1670 int os_vers = major_version * 1000 + minor_version; 1671 os::free(version_info); 1672 1673 st->print(" Windows "); 1674 switch (os_vers) { 1675 1676 case 6000: 1677 if (is_workstation) { 1678 st->print("Vista"); 1679 } else { 1680 st->print("Server 2008"); 1681 } 1682 break; 1683 1684 case 6001: 1685 if (is_workstation) { 1686 st->print("7"); 1687 } else { 1688 st->print("Server 2008 R2"); 1689 } 1690 break; 1691 1692 case 6002: 1693 if (is_workstation) { 1694 st->print("8"); 1695 } else { 1696 st->print("Server 2012"); 1697 } 1698 break; 1699 1700 case 6003: 1701 if (is_workstation) { 1702 st->print("8.1"); 1703 } else { 1704 st->print("Server 2012 R2"); 1705 } 1706 break; 1707 1708 case 10000: 1709 if (is_workstation) { 1710 st->print("10"); 1711 } else { 1712 // distinguish Windows Server 2016 and 2019 by build number 1713 // Windows server 2019 GA 10/2018 build number is 17763 1714 if (build_number > 17762) { 1715 st->print("Server 2019"); 1716 } else { 1717 st->print("Server 2016"); 1718 } 1719 } 1720 break; 1721 1722 default: 1723 // Unrecognized windows, print out its major and minor versions 1724 st->print("%d.%d", major_version, minor_version); 1725 break; 1726 } 1727 1728 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1729 // find out whether we are running on 64 bit processor or not 1730 SYSTEM_INFO si; 1731 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1732 GetNativeSystemInfo(&si); 1733 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1734 st->print(" , 64 bit"); 1735 } 1736 1737 st->print(" Build %d", build_number); 1738 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor); 1739 st->cr(); 1740 } 1741 1742 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1743 // Nothing to do for now. 1744 } 1745 1746 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1747 HKEY key; 1748 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE, 1749 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key); 1750 if (status == ERROR_SUCCESS) { 1751 DWORD size = (DWORD)buflen; 1752 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size); 1753 if (status != ERROR_SUCCESS) { 1754 strncpy(buf, "## __CPU__", buflen); 1755 } 1756 RegCloseKey(key); 1757 } else { 1758 // Put generic cpu info to return 1759 strncpy(buf, "## __CPU__", buflen); 1760 } 1761 } 1762 1763 void os::print_memory_info(outputStream* st) { 1764 st->print("Memory:"); 1765 st->print(" %dk page", os::vm_page_size()>>10); 1766 1767 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1768 // value if total memory is larger than 4GB 1769 MEMORYSTATUSEX ms; 1770 ms.dwLength = sizeof(ms); 1771 int r1 = GlobalMemoryStatusEx(&ms); 1772 1773 if (r1 != 0) { 1774 st->print(", system-wide physical " INT64_FORMAT "M ", 1775 (int64_t) ms.ullTotalPhys >> 20); 1776 st->print("(" INT64_FORMAT "M free)\n", (int64_t) ms.ullAvailPhys >> 20); 1777 1778 st->print("TotalPageFile size " INT64_FORMAT "M ", 1779 (int64_t) ms.ullTotalPageFile >> 20); 1780 st->print("(AvailPageFile size " INT64_FORMAT "M)", 1781 (int64_t) ms.ullAvailPageFile >> 20); 1782 1783 // on 32bit Total/AvailVirtual are interesting (show us how close we get to 2-4 GB per process borders) 1784 #if defined(_M_IX86) 1785 st->print(", user-mode portion of virtual address-space " INT64_FORMAT "M ", 1786 (int64_t) ms.ullTotalVirtual >> 20); 1787 st->print("(" INT64_FORMAT "M free)", (int64_t) ms.ullAvailVirtual >> 20); 1788 #endif 1789 } else { 1790 st->print(", GlobalMemoryStatusEx did not succeed so we miss some memory values."); 1791 } 1792 1793 // extended memory statistics for a process 1794 PROCESS_MEMORY_COUNTERS_EX pmex; 1795 ZeroMemory(&pmex, sizeof(PROCESS_MEMORY_COUNTERS_EX)); 1796 pmex.cb = sizeof(pmex); 1797 int r2 = GetProcessMemoryInfo(GetCurrentProcess(), (PROCESS_MEMORY_COUNTERS*) &pmex, sizeof(pmex)); 1798 1799 if (r2 != 0) { 1800 st->print("\ncurrent process WorkingSet (physical memory assigned to process): " INT64_FORMAT "M, ", 1801 (int64_t) pmex.WorkingSetSize >> 20); 1802 st->print("peak: " INT64_FORMAT "M\n", (int64_t) pmex.PeakWorkingSetSize >> 20); 1803 1804 st->print("current process commit charge (\"private bytes\"): " INT64_FORMAT "M, ", 1805 (int64_t) pmex.PrivateUsage >> 20); 1806 st->print("peak: " INT64_FORMAT "M", (int64_t) pmex.PeakPagefileUsage >> 20); 1807 } else { 1808 st->print("\nGetProcessMemoryInfo did not succeed so we miss some memory values."); 1809 } 1810 1811 st->cr(); 1812 } 1813 1814 bool os::signal_sent_by_kill(const void* siginfo) { 1815 // TODO: Is this possible? 1816 return false; 1817 } 1818 1819 void os::print_siginfo(outputStream *st, const void* siginfo) { 1820 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo; 1821 st->print("siginfo:"); 1822 1823 char tmp[64]; 1824 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) { 1825 strcpy(tmp, "EXCEPTION_??"); 1826 } 1827 st->print(" %s (0x%x)", tmp, er->ExceptionCode); 1828 1829 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION || 1830 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) && 1831 er->NumberParameters >= 2) { 1832 switch (er->ExceptionInformation[0]) { 1833 case 0: st->print(", reading address"); break; 1834 case 1: st->print(", writing address"); break; 1835 case 8: st->print(", data execution prevention violation at address"); break; 1836 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1837 er->ExceptionInformation[0]); 1838 } 1839 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1840 } else { 1841 int num = er->NumberParameters; 1842 if (num > 0) { 1843 st->print(", ExceptionInformation="); 1844 for (int i = 0; i < num; i++) { 1845 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1846 } 1847 } 1848 } 1849 st->cr(); 1850 } 1851 1852 bool os::signal_thread(Thread* thread, int sig, const char* reason) { 1853 // TODO: Can we kill thread? 1854 return false; 1855 } 1856 1857 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1858 // do nothing 1859 } 1860 1861 static char saved_jvm_path[MAX_PATH] = {0}; 1862 1863 // Find the full path to the current module, jvm.dll 1864 void os::jvm_path(char *buf, jint buflen) { 1865 // Error checking. 1866 if (buflen < MAX_PATH) { 1867 assert(false, "must use a large-enough buffer"); 1868 buf[0] = '\0'; 1869 return; 1870 } 1871 // Lazy resolve the path to current module. 1872 if (saved_jvm_path[0] != 0) { 1873 strcpy(buf, saved_jvm_path); 1874 return; 1875 } 1876 1877 buf[0] = '\0'; 1878 if (Arguments::sun_java_launcher_is_altjvm()) { 1879 // Support for the java launcher's '-XXaltjvm=<path>' option. Check 1880 // for a JAVA_HOME environment variable and fix up the path so it 1881 // looks like jvm.dll is installed there (append a fake suffix 1882 // hotspot/jvm.dll). 1883 char* java_home_var = ::getenv("JAVA_HOME"); 1884 if (java_home_var != NULL && java_home_var[0] != 0 && 1885 strlen(java_home_var) < (size_t)buflen) { 1886 strncpy(buf, java_home_var, buflen); 1887 1888 // determine if this is a legacy image or modules image 1889 // modules image doesn't have "jre" subdirectory 1890 size_t len = strlen(buf); 1891 char* jrebin_p = buf + len; 1892 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1893 if (0 != _access(buf, 0)) { 1894 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1895 } 1896 len = strlen(buf); 1897 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1898 } 1899 } 1900 1901 if (buf[0] == '\0') { 1902 GetModuleFileName(vm_lib_handle, buf, buflen); 1903 } 1904 strncpy(saved_jvm_path, buf, MAX_PATH); 1905 saved_jvm_path[MAX_PATH - 1] = '\0'; 1906 } 1907 1908 1909 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1910 #ifndef _WIN64 1911 st->print("_"); 1912 #endif 1913 } 1914 1915 1916 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1917 #ifndef _WIN64 1918 st->print("@%d", args_size * sizeof(int)); 1919 #endif 1920 } 1921 1922 // This method is a copy of JDK's sysGetLastErrorString 1923 // from src/windows/hpi/src/system_md.c 1924 1925 size_t os::lasterror(char* buf, size_t len) { 1926 DWORD errval; 1927 1928 if ((errval = GetLastError()) != 0) { 1929 // DOS error 1930 size_t n = (size_t)FormatMessage( 1931 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1932 NULL, 1933 errval, 1934 0, 1935 buf, 1936 (DWORD)len, 1937 NULL); 1938 if (n > 3) { 1939 // Drop final '.', CR, LF 1940 if (buf[n - 1] == '\n') n--; 1941 if (buf[n - 1] == '\r') n--; 1942 if (buf[n - 1] == '.') n--; 1943 buf[n] = '\0'; 1944 } 1945 return n; 1946 } 1947 1948 if (errno != 0) { 1949 // C runtime error that has no corresponding DOS error code 1950 const char* s = os::strerror(errno); 1951 size_t n = strlen(s); 1952 if (n >= len) n = len - 1; 1953 strncpy(buf, s, n); 1954 buf[n] = '\0'; 1955 return n; 1956 } 1957 1958 return 0; 1959 } 1960 1961 int os::get_last_error() { 1962 DWORD error = GetLastError(); 1963 if (error == 0) { 1964 error = errno; 1965 } 1966 return (int)error; 1967 } 1968 1969 // sun.misc.Signal 1970 // NOTE that this is a workaround for an apparent kernel bug where if 1971 // a signal handler for SIGBREAK is installed then that signal handler 1972 // takes priority over the console control handler for CTRL_CLOSE_EVENT. 1973 // See bug 4416763. 1974 static void (*sigbreakHandler)(int) = NULL; 1975 1976 static void UserHandler(int sig, void *siginfo, void *context) { 1977 os::signal_notify(sig); 1978 // We need to reinstate the signal handler each time... 1979 os::signal(sig, (void*)UserHandler); 1980 } 1981 1982 void* os::user_handler() { 1983 return (void*) UserHandler; 1984 } 1985 1986 void* os::signal(int signal_number, void* handler) { 1987 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1988 void (*oldHandler)(int) = sigbreakHandler; 1989 sigbreakHandler = (void (*)(int)) handler; 1990 return (void*) oldHandler; 1991 } else { 1992 return (void*)::signal(signal_number, (void (*)(int))handler); 1993 } 1994 } 1995 1996 void os::signal_raise(int signal_number) { 1997 raise(signal_number); 1998 } 1999 2000 // The Win32 C runtime library maps all console control events other than ^C 2001 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 2002 // logoff, and shutdown events. We therefore install our own console handler 2003 // that raises SIGTERM for the latter cases. 2004 // 2005 static BOOL WINAPI consoleHandler(DWORD event) { 2006 switch (event) { 2007 case CTRL_C_EVENT: 2008 if (VMError::is_error_reported()) { 2009 // Ctrl-C is pressed during error reporting, likely because the error 2010 // handler fails to abort. Let VM die immediately. 2011 os::die(); 2012 } 2013 2014 os::signal_raise(SIGINT); 2015 return TRUE; 2016 break; 2017 case CTRL_BREAK_EVENT: 2018 if (sigbreakHandler != NULL) { 2019 (*sigbreakHandler)(SIGBREAK); 2020 } 2021 return TRUE; 2022 break; 2023 case CTRL_LOGOFF_EVENT: { 2024 // Don't terminate JVM if it is running in a non-interactive session, 2025 // such as a service process. 2026 USEROBJECTFLAGS flags; 2027 HANDLE handle = GetProcessWindowStation(); 2028 if (handle != NULL && 2029 GetUserObjectInformation(handle, UOI_FLAGS, &flags, 2030 sizeof(USEROBJECTFLAGS), NULL)) { 2031 // If it is a non-interactive session, let next handler to deal 2032 // with it. 2033 if ((flags.dwFlags & WSF_VISIBLE) == 0) { 2034 return FALSE; 2035 } 2036 } 2037 } 2038 case CTRL_CLOSE_EVENT: 2039 case CTRL_SHUTDOWN_EVENT: 2040 os::signal_raise(SIGTERM); 2041 return TRUE; 2042 break; 2043 default: 2044 break; 2045 } 2046 return FALSE; 2047 } 2048 2049 // The following code is moved from os.cpp for making this 2050 // code platform specific, which it is by its very nature. 2051 2052 // Return maximum OS signal used + 1 for internal use only 2053 // Used as exit signal for signal_thread 2054 int os::sigexitnum_pd() { 2055 return NSIG; 2056 } 2057 2058 // a counter for each possible signal value, including signal_thread exit signal 2059 static volatile jint pending_signals[NSIG+1] = { 0 }; 2060 static Semaphore* sig_sem = NULL; 2061 2062 static void jdk_misc_signal_init() { 2063 // Initialize signal structures 2064 memset((void*)pending_signals, 0, sizeof(pending_signals)); 2065 2066 // Initialize signal semaphore 2067 sig_sem = new Semaphore(); 2068 2069 // Programs embedding the VM do not want it to attempt to receive 2070 // events like CTRL_LOGOFF_EVENT, which are used to implement the 2071 // shutdown hooks mechanism introduced in 1.3. For example, when 2072 // the VM is run as part of a Windows NT service (i.e., a servlet 2073 // engine in a web server), the correct behavior is for any console 2074 // control handler to return FALSE, not TRUE, because the OS's 2075 // "final" handler for such events allows the process to continue if 2076 // it is a service (while terminating it if it is not a service). 2077 // To make this behavior uniform and the mechanism simpler, we 2078 // completely disable the VM's usage of these console events if -Xrs 2079 // (=ReduceSignalUsage) is specified. This means, for example, that 2080 // the CTRL-BREAK thread dump mechanism is also disabled in this 2081 // case. See bugs 4323062, 4345157, and related bugs. 2082 2083 // Add a CTRL-C handler 2084 SetConsoleCtrlHandler(consoleHandler, TRUE); 2085 } 2086 2087 void os::signal_notify(int sig) { 2088 if (sig_sem != NULL) { 2089 Atomic::inc(&pending_signals[sig]); 2090 sig_sem->signal(); 2091 } else { 2092 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init 2093 // initialization isn't called. 2094 assert(ReduceSignalUsage, "signal semaphore should be created"); 2095 } 2096 } 2097 2098 static int check_pending_signals() { 2099 while (true) { 2100 for (int i = 0; i < NSIG + 1; i++) { 2101 jint n = pending_signals[i]; 2102 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2103 return i; 2104 } 2105 } 2106 JavaThread *thread = JavaThread::current(); 2107 2108 ThreadBlockInVM tbivm(thread); 2109 2110 bool threadIsSuspended; 2111 do { 2112 thread->set_suspend_equivalent(); 2113 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2114 sig_sem->wait(); 2115 2116 // were we externally suspended while we were waiting? 2117 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2118 if (threadIsSuspended) { 2119 // The semaphore has been incremented, but while we were waiting 2120 // another thread suspended us. We don't want to continue running 2121 // while suspended because that would surprise the thread that 2122 // suspended us. 2123 sig_sem->signal(); 2124 2125 thread->java_suspend_self(); 2126 } 2127 } while (threadIsSuspended); 2128 } 2129 } 2130 2131 int os::signal_wait() { 2132 return check_pending_signals(); 2133 } 2134 2135 // Implicit OS exception handling 2136 2137 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, 2138 address handler) { 2139 JavaThread* thread = (JavaThread*) Thread::current_or_null(); 2140 // Save pc in thread 2141 #ifdef _M_AMD64 2142 // Do not blow up if no thread info available. 2143 if (thread) { 2144 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip); 2145 } 2146 // Set pc to handler 2147 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 2148 #else 2149 // Do not blow up if no thread info available. 2150 if (thread) { 2151 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip); 2152 } 2153 // Set pc to handler 2154 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler; 2155 #endif 2156 2157 // Continue the execution 2158 return EXCEPTION_CONTINUE_EXECUTION; 2159 } 2160 2161 2162 // Used for PostMortemDump 2163 extern "C" void safepoints(); 2164 extern "C" void find(int x); 2165 extern "C" void events(); 2166 2167 // According to Windows API documentation, an illegal instruction sequence should generate 2168 // the 0xC000001C exception code. However, real world experience shows that occasionnaly 2169 // the execution of an illegal instruction can generate the exception code 0xC000001E. This 2170 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 2171 2172 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 2173 2174 // From "Execution Protection in the Windows Operating System" draft 0.35 2175 // Once a system header becomes available, the "real" define should be 2176 // included or copied here. 2177 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2178 2179 // Windows Vista/2008 heap corruption check 2180 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374 2181 2182 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual 2183 // C++ compiler contain this error code. Because this is a compiler-generated 2184 // error, the code is not listed in the Win32 API header files. 2185 // The code is actually a cryptic mnemonic device, with the initial "E" 2186 // standing for "exception" and the final 3 bytes (0x6D7363) representing the 2187 // ASCII values of "msc". 2188 2189 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363 2190 2191 #define def_excpt(val) { #val, (val) } 2192 2193 static const struct { const char* name; uint number; } exceptlabels[] = { 2194 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2195 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2196 def_excpt(EXCEPTION_BREAKPOINT), 2197 def_excpt(EXCEPTION_SINGLE_STEP), 2198 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2199 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2200 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2201 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2202 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2203 def_excpt(EXCEPTION_FLT_OVERFLOW), 2204 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2205 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2206 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2207 def_excpt(EXCEPTION_INT_OVERFLOW), 2208 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2209 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2210 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2211 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2212 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2213 def_excpt(EXCEPTION_STACK_OVERFLOW), 2214 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2215 def_excpt(EXCEPTION_GUARD_PAGE), 2216 def_excpt(EXCEPTION_INVALID_HANDLE), 2217 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION), 2218 def_excpt(EXCEPTION_HEAP_CORRUPTION) 2219 }; 2220 2221 #undef def_excpt 2222 2223 const char* os::exception_name(int exception_code, char *buf, size_t size) { 2224 uint code = static_cast<uint>(exception_code); 2225 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) { 2226 if (exceptlabels[i].number == code) { 2227 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2228 return buf; 2229 } 2230 } 2231 2232 return NULL; 2233 } 2234 2235 //----------------------------------------------------------------------------- 2236 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2237 // handle exception caused by idiv; should only happen for -MinInt/-1 2238 // (division by zero is handled explicitly) 2239 #ifdef _M_AMD64 2240 PCONTEXT ctx = exceptionInfo->ContextRecord; 2241 address pc = (address)ctx->Rip; 2242 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode"); 2243 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2244 if (pc[0] == 0xF7) { 2245 // set correct result values and continue after idiv instruction 2246 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes 2247 } else { 2248 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes 2249 } 2250 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation) 2251 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the 2252 // idiv opcode (0xF7). 2253 ctx->Rdx = (DWORD)0; // remainder 2254 // Continue the execution 2255 #else 2256 PCONTEXT ctx = exceptionInfo->ContextRecord; 2257 address pc = (address)ctx->Eip; 2258 assert(pc[0] == 0xF7, "not an idiv opcode"); 2259 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2260 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2261 // set correct result values and continue after idiv instruction 2262 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2263 ctx->Eax = (DWORD)min_jint; // result 2264 ctx->Edx = (DWORD)0; // remainder 2265 // Continue the execution 2266 #endif 2267 return EXCEPTION_CONTINUE_EXECUTION; 2268 } 2269 2270 //----------------------------------------------------------------------------- 2271 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2272 PCONTEXT ctx = exceptionInfo->ContextRecord; 2273 #ifndef _WIN64 2274 // handle exception caused by native method modifying control word 2275 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2276 2277 switch (exception_code) { 2278 case EXCEPTION_FLT_DENORMAL_OPERAND: 2279 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2280 case EXCEPTION_FLT_INEXACT_RESULT: 2281 case EXCEPTION_FLT_INVALID_OPERATION: 2282 case EXCEPTION_FLT_OVERFLOW: 2283 case EXCEPTION_FLT_STACK_CHECK: 2284 case EXCEPTION_FLT_UNDERFLOW: 2285 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2286 if (fp_control_word != ctx->FloatSave.ControlWord) { 2287 // Restore FPCW and mask out FLT exceptions 2288 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2289 // Mask out pending FLT exceptions 2290 ctx->FloatSave.StatusWord &= 0xffffff00; 2291 return EXCEPTION_CONTINUE_EXECUTION; 2292 } 2293 } 2294 2295 if (prev_uef_handler != NULL) { 2296 // We didn't handle this exception so pass it to the previous 2297 // UnhandledExceptionFilter. 2298 return (prev_uef_handler)(exceptionInfo); 2299 } 2300 #else // !_WIN64 2301 // On Windows, the mxcsr control bits are non-volatile across calls 2302 // See also CR 6192333 2303 // 2304 jint MxCsr = INITIAL_MXCSR; 2305 // we can't use StubRoutines::addr_mxcsr_std() 2306 // because in Win64 mxcsr is not saved there 2307 if (MxCsr != ctx->MxCsr) { 2308 ctx->MxCsr = MxCsr; 2309 return EXCEPTION_CONTINUE_EXECUTION; 2310 } 2311 #endif // !_WIN64 2312 2313 return EXCEPTION_CONTINUE_SEARCH; 2314 } 2315 2316 static inline void report_error(Thread* t, DWORD exception_code, 2317 address addr, void* siginfo, void* context) { 2318 VMError::report_and_die(t, exception_code, addr, siginfo, context); 2319 2320 // If UseOsErrorReporting, this will return here and save the error file 2321 // somewhere where we can find it in the minidump. 2322 } 2323 2324 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread, 2325 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) { 2326 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2327 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2328 if (Interpreter::contains(pc)) { 2329 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord); 2330 if (!fr->is_first_java_frame()) { 2331 // get_frame_at_stack_banging_point() is only called when we 2332 // have well defined stacks so java_sender() calls do not need 2333 // to assert safe_for_sender() first. 2334 *fr = fr->java_sender(); 2335 } 2336 } else { 2337 // more complex code with compiled code 2338 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above"); 2339 CodeBlob* cb = CodeCache::find_blob(pc); 2340 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) { 2341 // Not sure where the pc points to, fallback to default 2342 // stack overflow handling 2343 return false; 2344 } else { 2345 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord); 2346 // in compiled code, the stack banging is performed just after the return pc 2347 // has been pushed on the stack 2348 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp())); 2349 if (!fr->is_java_frame()) { 2350 // See java_sender() comment above. 2351 *fr = fr->java_sender(); 2352 } 2353 } 2354 } 2355 assert(fr->is_java_frame(), "Safety check"); 2356 return true; 2357 } 2358 2359 #if INCLUDE_AOT 2360 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2361 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2362 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2363 address pc = (address) exceptionInfo->ContextRecord->Rip; 2364 2365 // Handle the case where we get an implicit exception in AOT generated 2366 // code. AOT DLL's loaded are not registered for structured exceptions. 2367 // If the exception occurred in the codeCache or AOT code, pass control 2368 // to our normal exception handler. 2369 CodeBlob* cb = CodeCache::find_blob(pc); 2370 if (cb != NULL) { 2371 return topLevelExceptionFilter(exceptionInfo); 2372 } 2373 2374 return EXCEPTION_CONTINUE_SEARCH; 2375 } 2376 #endif 2377 2378 //----------------------------------------------------------------------------- 2379 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2380 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2381 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2382 #ifdef _M_AMD64 2383 address pc = (address) exceptionInfo->ContextRecord->Rip; 2384 #else 2385 address pc = (address) exceptionInfo->ContextRecord->Eip; 2386 #endif 2387 Thread* t = Thread::current_or_null_safe(); 2388 2389 // Handle SafeFetch32 and SafeFetchN exceptions. 2390 if (StubRoutines::is_safefetch_fault(pc)) { 2391 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc)); 2392 } 2393 2394 #ifndef _WIN64 2395 // Execution protection violation - win32 running on AMD64 only 2396 // Handled first to avoid misdiagnosis as a "normal" access violation; 2397 // This is safe to do because we have a new/unique ExceptionInformation 2398 // code for this condition. 2399 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2400 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2401 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2402 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2403 2404 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2405 int page_size = os::vm_page_size(); 2406 2407 // Make sure the pc and the faulting address are sane. 2408 // 2409 // If an instruction spans a page boundary, and the page containing 2410 // the beginning of the instruction is executable but the following 2411 // page is not, the pc and the faulting address might be slightly 2412 // different - we still want to unguard the 2nd page in this case. 2413 // 2414 // 15 bytes seems to be a (very) safe value for max instruction size. 2415 bool pc_is_near_addr = 2416 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2417 bool instr_spans_page_boundary = 2418 (align_down((intptr_t) pc ^ (intptr_t) addr, 2419 (intptr_t) page_size) > 0); 2420 2421 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2422 static volatile address last_addr = 2423 (address) os::non_memory_address_word(); 2424 2425 // In conservative mode, don't unguard unless the address is in the VM 2426 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2427 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2428 2429 // Set memory to RWX and retry 2430 address page_start = align_down(addr, page_size); 2431 bool res = os::protect_memory((char*) page_start, page_size, 2432 os::MEM_PROT_RWX); 2433 2434 log_debug(os)("Execution protection violation " 2435 "at " INTPTR_FORMAT 2436 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr), 2437 p2i(page_start), (res ? "success" : os::strerror(errno))); 2438 2439 // Set last_addr so if we fault again at the same address, we don't 2440 // end up in an endless loop. 2441 // 2442 // There are two potential complications here. Two threads trapping 2443 // at the same address at the same time could cause one of the 2444 // threads to think it already unguarded, and abort the VM. Likely 2445 // very rare. 2446 // 2447 // The other race involves two threads alternately trapping at 2448 // different addresses and failing to unguard the page, resulting in 2449 // an endless loop. This condition is probably even more unlikely 2450 // than the first. 2451 // 2452 // Although both cases could be avoided by using locks or thread 2453 // local last_addr, these solutions are unnecessary complication: 2454 // this handler is a best-effort safety net, not a complete solution. 2455 // It is disabled by default and should only be used as a workaround 2456 // in case we missed any no-execute-unsafe VM code. 2457 2458 last_addr = addr; 2459 2460 return EXCEPTION_CONTINUE_EXECUTION; 2461 } 2462 } 2463 2464 // Last unguard failed or not unguarding 2465 tty->print_raw_cr("Execution protection violation"); 2466 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2467 exceptionInfo->ContextRecord); 2468 return EXCEPTION_CONTINUE_SEARCH; 2469 } 2470 } 2471 #endif // _WIN64 2472 2473 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) && 2474 VM_Version::is_cpuinfo_segv_addr(pc)) { 2475 // Verify that OS save/restore AVX registers. 2476 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr()); 2477 } 2478 2479 if (t != NULL && t->is_Java_thread()) { 2480 JavaThread* thread = (JavaThread*) t; 2481 bool in_java = thread->thread_state() == _thread_in_Java; 2482 2483 // Handle potential stack overflows up front. 2484 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2485 if (thread->stack_guards_enabled()) { 2486 if (in_java) { 2487 frame fr; 2488 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2489 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2490 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) { 2491 assert(fr.is_java_frame(), "Must be a Java frame"); 2492 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr); 2493 } 2494 } 2495 // Yellow zone violation. The o/s has unprotected the first yellow 2496 // zone page for us. Note: must call disable_stack_yellow_zone to 2497 // update the enabled status, even if the zone contains only one page. 2498 assert(thread->thread_state() != _thread_in_vm, "Undersized StackShadowPages"); 2499 thread->disable_stack_yellow_reserved_zone(); 2500 // If not in java code, return and hope for the best. 2501 return in_java 2502 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2503 : EXCEPTION_CONTINUE_EXECUTION; 2504 } else { 2505 // Fatal red zone violation. 2506 thread->disable_stack_red_zone(); 2507 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2508 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2509 exceptionInfo->ContextRecord); 2510 return EXCEPTION_CONTINUE_SEARCH; 2511 } 2512 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2513 // Either stack overflow or null pointer exception. 2514 if (in_java) { 2515 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2516 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2517 address stack_end = thread->stack_end(); 2518 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2519 // Stack overflow. 2520 assert(!os::uses_stack_guard_pages(), 2521 "should be caught by red zone code above."); 2522 return Handle_Exception(exceptionInfo, 2523 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2524 } 2525 // Check for safepoint polling and implicit null 2526 // We only expect null pointers in the stubs (vtable) 2527 // the rest are checked explicitly now. 2528 CodeBlob* cb = CodeCache::find_blob(pc); 2529 if (cb != NULL) { 2530 if (os::is_poll_address(addr)) { 2531 address stub = SharedRuntime::get_poll_stub(pc); 2532 return Handle_Exception(exceptionInfo, stub); 2533 } 2534 } 2535 { 2536 #ifdef _WIN64 2537 // If it's a legal stack address map the entire region in 2538 // 2539 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2540 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2541 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) { 2542 addr = (address)((uintptr_t)addr & 2543 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2544 os::commit_memory((char *)addr, thread->stack_base() - addr, 2545 !ExecMem); 2546 return EXCEPTION_CONTINUE_EXECUTION; 2547 } else 2548 #endif 2549 { 2550 // Null pointer exception. 2551 if (MacroAssembler::uses_implicit_null_check((void*)addr)) { 2552 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2553 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2554 } 2555 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2556 exceptionInfo->ContextRecord); 2557 return EXCEPTION_CONTINUE_SEARCH; 2558 } 2559 } 2560 } 2561 2562 #ifdef _WIN64 2563 // Special care for fast JNI field accessors. 2564 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2565 // in and the heap gets shrunk before the field access. 2566 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2567 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2568 if (addr != (address)-1) { 2569 return Handle_Exception(exceptionInfo, addr); 2570 } 2571 } 2572 #endif 2573 2574 // Stack overflow or null pointer exception in native code. 2575 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2576 exceptionInfo->ContextRecord); 2577 return EXCEPTION_CONTINUE_SEARCH; 2578 } // /EXCEPTION_ACCESS_VIOLATION 2579 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2580 2581 if (exception_code == EXCEPTION_IN_PAGE_ERROR) { 2582 CompiledMethod* nm = NULL; 2583 JavaThread* thread = (JavaThread*)t; 2584 if (in_java) { 2585 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 2586 nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL; 2587 } 2588 2589 bool is_unsafe_arraycopy = (thread->thread_state() == _thread_in_native || in_java) && UnsafeCopyMemory::contains_pc(pc); 2590 if (((thread->thread_state() == _thread_in_vm || 2591 thread->thread_state() == _thread_in_native || 2592 is_unsafe_arraycopy) && 2593 thread->doing_unsafe_access()) || 2594 (nm != NULL && nm->has_unsafe_access())) { 2595 address next_pc = Assembler::locate_next_instruction(pc); 2596 if (is_unsafe_arraycopy) { 2597 next_pc = UnsafeCopyMemory::page_error_continue_pc(pc); 2598 } 2599 return Handle_Exception(exceptionInfo, SharedRuntime::handle_unsafe_access(thread, next_pc)); 2600 } 2601 } 2602 2603 if (in_java) { 2604 switch (exception_code) { 2605 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2606 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2607 2608 case EXCEPTION_INT_OVERFLOW: 2609 return Handle_IDiv_Exception(exceptionInfo); 2610 2611 } // switch 2612 } 2613 if (((thread->thread_state() == _thread_in_Java) || 2614 (thread->thread_state() == _thread_in_native)) && 2615 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) { 2616 LONG result=Handle_FLT_Exception(exceptionInfo); 2617 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2618 } 2619 } 2620 2621 if (exception_code != EXCEPTION_BREAKPOINT) { 2622 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2623 exceptionInfo->ContextRecord); 2624 } 2625 return EXCEPTION_CONTINUE_SEARCH; 2626 } 2627 2628 #ifndef _WIN64 2629 // Special care for fast JNI accessors. 2630 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2631 // the heap gets shrunk before the field access. 2632 // Need to install our own structured exception handler since native code may 2633 // install its own. 2634 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2635 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2636 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2637 address pc = (address) exceptionInfo->ContextRecord->Eip; 2638 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2639 if (addr != (address)-1) { 2640 return Handle_Exception(exceptionInfo, addr); 2641 } 2642 } 2643 return EXCEPTION_CONTINUE_SEARCH; 2644 } 2645 2646 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \ 2647 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \ 2648 jobject obj, \ 2649 jfieldID fieldID) { \ 2650 __try { \ 2651 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \ 2652 obj, \ 2653 fieldID); \ 2654 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \ 2655 _exception_info())) { \ 2656 } \ 2657 return 0; \ 2658 } 2659 2660 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2661 DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2662 DEFINE_FAST_GETFIELD(jchar, char, Char) 2663 DEFINE_FAST_GETFIELD(jshort, short, Short) 2664 DEFINE_FAST_GETFIELD(jint, int, Int) 2665 DEFINE_FAST_GETFIELD(jlong, long, Long) 2666 DEFINE_FAST_GETFIELD(jfloat, float, Float) 2667 DEFINE_FAST_GETFIELD(jdouble, double, Double) 2668 2669 address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2670 switch (type) { 2671 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2672 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2673 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2674 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2675 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2676 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2677 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2678 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2679 default: ShouldNotReachHere(); 2680 } 2681 return (address)-1; 2682 } 2683 #endif 2684 2685 // Virtual Memory 2686 2687 int os::vm_page_size() { return os::win32::vm_page_size(); } 2688 int os::vm_allocation_granularity() { 2689 return os::win32::vm_allocation_granularity(); 2690 } 2691 2692 // Windows large page support is available on Windows 2003. In order to use 2693 // large page memory, the administrator must first assign additional privilege 2694 // to the user: 2695 // + select Control Panel -> Administrative Tools -> Local Security Policy 2696 // + select Local Policies -> User Rights Assignment 2697 // + double click "Lock pages in memory", add users and/or groups 2698 // + reboot 2699 // Note the above steps are needed for administrator as well, as administrators 2700 // by default do not have the privilege to lock pages in memory. 2701 // 2702 // Note about Windows 2003: although the API supports committing large page 2703 // memory on a page-by-page basis and VirtualAlloc() returns success under this 2704 // scenario, I found through experiment it only uses large page if the entire 2705 // memory region is reserved and committed in a single VirtualAlloc() call. 2706 // This makes Windows large page support more or less like Solaris ISM, in 2707 // that the entire heap must be committed upfront. This probably will change 2708 // in the future, if so the code below needs to be revisited. 2709 2710 #ifndef MEM_LARGE_PAGES 2711 #define MEM_LARGE_PAGES 0x20000000 2712 #endif 2713 2714 static HANDLE _hProcess; 2715 static HANDLE _hToken; 2716 2717 // Container for NUMA node list info 2718 class NUMANodeListHolder { 2719 private: 2720 int *_numa_used_node_list; // allocated below 2721 int _numa_used_node_count; 2722 2723 void free_node_list() { 2724 FREE_C_HEAP_ARRAY(int, _numa_used_node_list); 2725 } 2726 2727 public: 2728 NUMANodeListHolder() { 2729 _numa_used_node_count = 0; 2730 _numa_used_node_list = NULL; 2731 // do rest of initialization in build routine (after function pointers are set up) 2732 } 2733 2734 ~NUMANodeListHolder() { 2735 free_node_list(); 2736 } 2737 2738 bool build() { 2739 DWORD_PTR proc_aff_mask; 2740 DWORD_PTR sys_aff_mask; 2741 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false; 2742 ULONG highest_node_number; 2743 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false; 2744 free_node_list(); 2745 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal); 2746 for (unsigned int i = 0; i <= highest_node_number; i++) { 2747 ULONGLONG proc_mask_numa_node; 2748 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false; 2749 if ((proc_aff_mask & proc_mask_numa_node)!=0) { 2750 _numa_used_node_list[_numa_used_node_count++] = i; 2751 } 2752 } 2753 return (_numa_used_node_count > 1); 2754 } 2755 2756 int get_count() { return _numa_used_node_count; } 2757 int get_node_list_entry(int n) { 2758 // for indexes out of range, returns -1 2759 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1); 2760 } 2761 2762 } numa_node_list_holder; 2763 2764 2765 2766 static size_t _large_page_size = 0; 2767 2768 static bool request_lock_memory_privilege() { 2769 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2770 os::current_process_id()); 2771 2772 LUID luid; 2773 if (_hProcess != NULL && 2774 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2775 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2776 2777 TOKEN_PRIVILEGES tp; 2778 tp.PrivilegeCount = 1; 2779 tp.Privileges[0].Luid = luid; 2780 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2781 2782 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2783 // privilege. Check GetLastError() too. See MSDN document. 2784 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2785 (GetLastError() == ERROR_SUCCESS)) { 2786 return true; 2787 } 2788 } 2789 2790 return false; 2791 } 2792 2793 static void cleanup_after_large_page_init() { 2794 if (_hProcess) CloseHandle(_hProcess); 2795 _hProcess = NULL; 2796 if (_hToken) CloseHandle(_hToken); 2797 _hToken = NULL; 2798 } 2799 2800 static bool numa_interleaving_init() { 2801 bool success = false; 2802 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving); 2803 2804 // print a warning if UseNUMAInterleaving flag is specified on command line 2805 bool warn_on_failure = use_numa_interleaving_specified; 2806 #define WARN(msg) if (warn_on_failure) { warning(msg); } 2807 2808 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages) 2809 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2810 NUMAInterleaveGranularity = align_up(NUMAInterleaveGranularity, min_interleave_granularity); 2811 2812 if (numa_node_list_holder.build()) { 2813 if (log_is_enabled(Debug, os, cpu)) { 2814 Log(os, cpu) log; 2815 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count()); 2816 for (int i = 0; i < numa_node_list_holder.get_count(); i++) { 2817 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i)); 2818 } 2819 } 2820 success = true; 2821 } else { 2822 WARN("Process does not cover multiple NUMA nodes."); 2823 } 2824 if (!success) { 2825 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag."); 2826 } 2827 return success; 2828 #undef WARN 2829 } 2830 2831 // this routine is used whenever we need to reserve a contiguous VA range 2832 // but we need to make separate VirtualAlloc calls for each piece of the range 2833 // Reasons for doing this: 2834 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise) 2835 // * UseNUMAInterleaving requires a separate node for each piece 2836 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, 2837 DWORD prot, 2838 bool should_inject_error = false) { 2839 char * p_buf; 2840 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size 2841 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2842 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size; 2843 2844 // first reserve enough address space in advance since we want to be 2845 // able to break a single contiguous virtual address range into multiple 2846 // large page commits but WS2003 does not allow reserving large page space 2847 // so we just use 4K pages for reserve, this gives us a legal contiguous 2848 // address space. then we will deallocate that reservation, and re alloc 2849 // using large pages 2850 const size_t size_of_reserve = bytes + chunk_size; 2851 if (bytes > size_of_reserve) { 2852 // Overflowed. 2853 return NULL; 2854 } 2855 p_buf = (char *) VirtualAlloc(addr, 2856 size_of_reserve, // size of Reserve 2857 MEM_RESERVE, 2858 PAGE_READWRITE); 2859 // If reservation failed, return NULL 2860 if (p_buf == NULL) return NULL; 2861 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC); 2862 os::release_memory(p_buf, bytes + chunk_size); 2863 2864 // we still need to round up to a page boundary (in case we are using large pages) 2865 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size) 2866 // instead we handle this in the bytes_to_rq computation below 2867 p_buf = align_up(p_buf, page_size); 2868 2869 // now go through and allocate one chunk at a time until all bytes are 2870 // allocated 2871 size_t bytes_remaining = bytes; 2872 // An overflow of align_up() would have been caught above 2873 // in the calculation of size_of_reserve. 2874 char * next_alloc_addr = p_buf; 2875 HANDLE hProc = GetCurrentProcess(); 2876 2877 #ifdef ASSERT 2878 // Variable for the failure injection 2879 int ran_num = os::random(); 2880 size_t fail_after = ran_num % bytes; 2881 #endif 2882 2883 int count=0; 2884 while (bytes_remaining) { 2885 // select bytes_to_rq to get to the next chunk_size boundary 2886 2887 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size)); 2888 // Note allocate and commit 2889 char * p_new; 2890 2891 #ifdef ASSERT 2892 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after); 2893 #else 2894 const bool inject_error_now = false; 2895 #endif 2896 2897 if (inject_error_now) { 2898 p_new = NULL; 2899 } else { 2900 if (!UseNUMAInterleaving) { 2901 p_new = (char *) VirtualAlloc(next_alloc_addr, 2902 bytes_to_rq, 2903 flags, 2904 prot); 2905 } else { 2906 // get the next node to use from the used_node_list 2907 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected"); 2908 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count()); 2909 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node); 2910 } 2911 } 2912 2913 if (p_new == NULL) { 2914 // Free any allocated pages 2915 if (next_alloc_addr > p_buf) { 2916 // Some memory was committed so release it. 2917 size_t bytes_to_release = bytes - bytes_remaining; 2918 // NMT has yet to record any individual blocks, so it 2919 // need to create a dummy 'reserve' record to match 2920 // the release. 2921 MemTracker::record_virtual_memory_reserve((address)p_buf, 2922 bytes_to_release, CALLER_PC); 2923 os::release_memory(p_buf, bytes_to_release); 2924 } 2925 #ifdef ASSERT 2926 if (should_inject_error) { 2927 log_develop_debug(pagesize)("Reserving pages individually failed."); 2928 } 2929 #endif 2930 return NULL; 2931 } 2932 2933 bytes_remaining -= bytes_to_rq; 2934 next_alloc_addr += bytes_to_rq; 2935 count++; 2936 } 2937 // Although the memory is allocated individually, it is returned as one. 2938 // NMT records it as one block. 2939 if ((flags & MEM_COMMIT) != 0) { 2940 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC); 2941 } else { 2942 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC); 2943 } 2944 2945 // made it this far, success 2946 return p_buf; 2947 } 2948 2949 2950 2951 void os::large_page_init() { 2952 if (!UseLargePages) return; 2953 2954 // print a warning if any large page related flag is specified on command line 2955 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2956 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2957 bool success = false; 2958 2959 #define WARN(msg) if (warn_on_failure) { warning(msg); } 2960 if (request_lock_memory_privilege()) { 2961 size_t s = GetLargePageMinimum(); 2962 if (s) { 2963 #if defined(IA32) || defined(AMD64) 2964 if (s > 4*M || LargePageSizeInBytes > 4*M) { 2965 WARN("JVM cannot use large pages bigger than 4mb."); 2966 } else { 2967 #endif 2968 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 2969 _large_page_size = LargePageSizeInBytes; 2970 } else { 2971 _large_page_size = s; 2972 } 2973 success = true; 2974 #if defined(IA32) || defined(AMD64) 2975 } 2976 #endif 2977 } else { 2978 WARN("Large page is not supported by the processor."); 2979 } 2980 } else { 2981 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 2982 } 2983 #undef WARN 2984 2985 const size_t default_page_size = (size_t) vm_page_size(); 2986 if (success && _large_page_size > default_page_size) { 2987 _page_sizes[0] = _large_page_size; 2988 _page_sizes[1] = default_page_size; 2989 _page_sizes[2] = 0; 2990 } 2991 2992 cleanup_after_large_page_init(); 2993 UseLargePages = success; 2994 } 2995 2996 int os::create_file_for_heap(const char* dir) { 2997 2998 const char name_template[] = "/jvmheap.XXXXXX"; 2999 3000 size_t fullname_len = strlen(dir) + strlen(name_template); 3001 char *fullname = (char*)os::malloc(fullname_len + 1, mtInternal); 3002 if (fullname == NULL) { 3003 vm_exit_during_initialization(err_msg("Malloc failed during creation of backing file for heap (%s)", os::strerror(errno))); 3004 return -1; 3005 } 3006 int n = snprintf(fullname, fullname_len + 1, "%s%s", dir, name_template); 3007 assert((size_t)n == fullname_len, "Unexpected number of characters in string"); 3008 3009 os::native_path(fullname); 3010 3011 char *path = _mktemp(fullname); 3012 if (path == NULL) { 3013 warning("_mktemp could not create file name from template %s (%s)", fullname, os::strerror(errno)); 3014 os::free(fullname); 3015 return -1; 3016 } 3017 3018 int fd = _open(path, O_RDWR | O_CREAT | O_TEMPORARY | O_EXCL, S_IWRITE | S_IREAD); 3019 3020 os::free(fullname); 3021 if (fd < 0) { 3022 warning("Problem opening file for heap (%s)", os::strerror(errno)); 3023 return -1; 3024 } 3025 return fd; 3026 } 3027 3028 // If 'base' is not NULL, function will return NULL if it cannot get 'base' 3029 char* os::map_memory_to_file(char* base, size_t size, int fd) { 3030 assert(fd != -1, "File descriptor is not valid"); 3031 3032 HANDLE fh = (HANDLE)_get_osfhandle(fd); 3033 #ifdef _LP64 3034 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE, 3035 (DWORD)(size >> 32), (DWORD)(size & 0xFFFFFFFF), NULL); 3036 #else 3037 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE, 3038 0, (DWORD)size, NULL); 3039 #endif 3040 if (fileMapping == NULL) { 3041 if (GetLastError() == ERROR_DISK_FULL) { 3042 vm_exit_during_initialization(err_msg("Could not allocate sufficient disk space for Java heap")); 3043 } 3044 else { 3045 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); 3046 } 3047 3048 return NULL; 3049 } 3050 3051 LPVOID addr = MapViewOfFileEx(fileMapping, FILE_MAP_WRITE, 0, 0, size, base); 3052 3053 CloseHandle(fileMapping); 3054 3055 return (char*)addr; 3056 } 3057 3058 char* os::replace_existing_mapping_with_file_mapping(char* base, size_t size, int fd) { 3059 assert(fd != -1, "File descriptor is not valid"); 3060 assert(base != NULL, "Base address cannot be NULL"); 3061 3062 release_memory(base, size); 3063 return map_memory_to_file(base, size, fd); 3064 } 3065 3066 // On win32, one cannot release just a part of reserved memory, it's an 3067 // all or nothing deal. When we split a reservation, we must break the 3068 // reservation into two reservations. 3069 void os::pd_split_reserved_memory(char *base, size_t size, size_t split, 3070 bool realloc) { 3071 if (size > 0) { 3072 release_memory(base, size); 3073 if (realloc) { 3074 reserve_memory(split, base); 3075 } 3076 if (size != split) { 3077 reserve_memory(size - split, base + split); 3078 } 3079 } 3080 } 3081 3082 // Multiple threads can race in this code but it's not possible to unmap small sections of 3083 // virtual space to get requested alignment, like posix-like os's. 3084 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe. 3085 char* os::reserve_memory_aligned(size_t size, size_t alignment, int file_desc) { 3086 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 3087 "Alignment must be a multiple of allocation granularity (page size)"); 3088 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 3089 3090 size_t extra_size = size + alignment; 3091 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 3092 3093 char* aligned_base = NULL; 3094 3095 do { 3096 char* extra_base = os::reserve_memory(extra_size, NULL, alignment, file_desc); 3097 if (extra_base == NULL) { 3098 return NULL; 3099 } 3100 // Do manual alignment 3101 aligned_base = align_up(extra_base, alignment); 3102 3103 if (file_desc != -1) { 3104 os::unmap_memory(extra_base, extra_size); 3105 } else { 3106 os::release_memory(extra_base, extra_size); 3107 } 3108 3109 aligned_base = os::reserve_memory(size, aligned_base, 0, file_desc); 3110 3111 } while (aligned_base == NULL); 3112 3113 return aligned_base; 3114 } 3115 3116 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 3117 assert((size_t)addr % os::vm_allocation_granularity() == 0, 3118 "reserve alignment"); 3119 assert(bytes % os::vm_page_size() == 0, "reserve page size"); 3120 char* res; 3121 // note that if UseLargePages is on, all the areas that require interleaving 3122 // will go thru reserve_memory_special rather than thru here. 3123 bool use_individual = (UseNUMAInterleaving && !UseLargePages); 3124 if (!use_individual) { 3125 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 3126 } else { 3127 elapsedTimer reserveTimer; 3128 if (Verbose && PrintMiscellaneous) reserveTimer.start(); 3129 // in numa interleaving, we have to allocate pages individually 3130 // (well really chunks of NUMAInterleaveGranularity size) 3131 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE); 3132 if (res == NULL) { 3133 warning("NUMA page allocation failed"); 3134 } 3135 if (Verbose && PrintMiscellaneous) { 3136 reserveTimer.stop(); 3137 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes, 3138 reserveTimer.milliseconds(), reserveTimer.ticks()); 3139 } 3140 } 3141 assert(res == NULL || addr == NULL || addr == res, 3142 "Unexpected address from reserve."); 3143 3144 return res; 3145 } 3146 3147 // Reserve memory at an arbitrary address, only if that area is 3148 // available (and not reserved for something else). 3149 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3150 // Windows os::reserve_memory() fails of the requested address range is 3151 // not avilable. 3152 return reserve_memory(bytes, requested_addr); 3153 } 3154 3155 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) { 3156 assert(file_desc >= 0, "file_desc is not valid"); 3157 return map_memory_to_file(requested_addr, bytes, file_desc); 3158 } 3159 3160 size_t os::large_page_size() { 3161 return _large_page_size; 3162 } 3163 3164 bool os::can_commit_large_page_memory() { 3165 // Windows only uses large page memory when the entire region is reserved 3166 // and committed in a single VirtualAlloc() call. This may change in the 3167 // future, but with Windows 2003 it's not possible to commit on demand. 3168 return false; 3169 } 3170 3171 bool os::can_execute_large_page_memory() { 3172 return true; 3173 } 3174 3175 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, 3176 bool exec) { 3177 assert(UseLargePages, "only for large pages"); 3178 3179 if (!is_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { 3180 return NULL; // Fallback to small pages. 3181 } 3182 3183 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 3184 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3185 3186 // with large pages, there are two cases where we need to use Individual Allocation 3187 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003) 3188 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page 3189 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) { 3190 log_debug(pagesize)("Reserving large pages individually."); 3191 3192 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError); 3193 if (p_buf == NULL) { 3194 // give an appropriate warning message 3195 if (UseNUMAInterleaving) { 3196 warning("NUMA large page allocation failed, UseLargePages flag ignored"); 3197 } 3198 if (UseLargePagesIndividualAllocation) { 3199 warning("Individually allocated large pages failed, " 3200 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 3201 } 3202 return NULL; 3203 } 3204 3205 return p_buf; 3206 3207 } else { 3208 log_debug(pagesize)("Reserving large pages in a single large chunk."); 3209 3210 // normal policy just allocate it all at once 3211 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3212 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); 3213 if (res != NULL) { 3214 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC); 3215 } 3216 3217 return res; 3218 } 3219 } 3220 3221 bool os::release_memory_special(char* base, size_t bytes) { 3222 assert(base != NULL, "Sanity check"); 3223 return release_memory(base, bytes); 3224 } 3225 3226 void os::print_statistics() { 3227 } 3228 3229 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) { 3230 int err = os::get_last_error(); 3231 char buf[256]; 3232 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3233 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 3234 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3235 exec, buf_len != 0 ? buf : "<no_error_string>", err); 3236 } 3237 3238 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 3239 if (bytes == 0) { 3240 // Don't bother the OS with noops. 3241 return true; 3242 } 3243 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 3244 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 3245 // Don't attempt to print anything if the OS call fails. We're 3246 // probably low on resources, so the print itself may cause crashes. 3247 3248 // unless we have NUMAInterleaving enabled, the range of a commit 3249 // is always within a reserve covered by a single VirtualAlloc 3250 // in that case we can just do a single commit for the requested size 3251 if (!UseNUMAInterleaving) { 3252 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) { 3253 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3254 return false; 3255 } 3256 if (exec) { 3257 DWORD oldprot; 3258 // Windows doc says to use VirtualProtect to get execute permissions 3259 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) { 3260 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3261 return false; 3262 } 3263 } 3264 return true; 3265 } else { 3266 3267 // when NUMAInterleaving is enabled, the commit might cover a range that 3268 // came from multiple VirtualAlloc reserves (using allocate_pages_individually). 3269 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery 3270 // returns represents the number of bytes that can be committed in one step. 3271 size_t bytes_remaining = bytes; 3272 char * next_alloc_addr = addr; 3273 while (bytes_remaining > 0) { 3274 MEMORY_BASIC_INFORMATION alloc_info; 3275 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info)); 3276 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3277 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, 3278 PAGE_READWRITE) == NULL) { 3279 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3280 exec);) 3281 return false; 3282 } 3283 if (exec) { 3284 DWORD oldprot; 3285 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, 3286 PAGE_EXECUTE_READWRITE, &oldprot)) { 3287 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3288 exec);) 3289 return false; 3290 } 3291 } 3292 bytes_remaining -= bytes_to_rq; 3293 next_alloc_addr += bytes_to_rq; 3294 } 3295 } 3296 // if we made it this far, return true 3297 return true; 3298 } 3299 3300 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 3301 bool exec) { 3302 // alignment_hint is ignored on this OS 3303 return pd_commit_memory(addr, size, exec); 3304 } 3305 3306 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 3307 const char* mesg) { 3308 assert(mesg != NULL, "mesg must be specified"); 3309 if (!pd_commit_memory(addr, size, exec)) { 3310 warn_fail_commit_memory(addr, size, exec); 3311 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 3312 } 3313 } 3314 3315 void os::pd_commit_memory_or_exit(char* addr, size_t size, 3316 size_t alignment_hint, bool exec, 3317 const char* mesg) { 3318 // alignment_hint is ignored on this OS 3319 pd_commit_memory_or_exit(addr, size, exec, mesg); 3320 } 3321 3322 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3323 if (bytes == 0) { 3324 // Don't bother the OS with noops. 3325 return true; 3326 } 3327 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 3328 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 3329 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0); 3330 } 3331 3332 bool os::pd_release_memory(char* addr, size_t bytes) { 3333 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 3334 } 3335 3336 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 3337 return os::commit_memory(addr, size, !ExecMem); 3338 } 3339 3340 bool os::remove_stack_guard_pages(char* addr, size_t size) { 3341 return os::uncommit_memory(addr, size); 3342 } 3343 3344 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) { 3345 uint count = 0; 3346 bool ret = false; 3347 size_t bytes_remaining = bytes; 3348 char * next_protect_addr = addr; 3349 3350 // Use VirtualQuery() to get the chunk size. 3351 while (bytes_remaining) { 3352 MEMORY_BASIC_INFORMATION alloc_info; 3353 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) { 3354 return false; 3355 } 3356 3357 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3358 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving, 3359 // but we don't distinguish here as both cases are protected by same API. 3360 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0; 3361 warning("Failed protecting pages individually for chunk #%u", count); 3362 if (!ret) { 3363 return false; 3364 } 3365 3366 bytes_remaining -= bytes_to_protect; 3367 next_protect_addr += bytes_to_protect; 3368 count++; 3369 } 3370 return ret; 3371 } 3372 3373 // Set protections specified 3374 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3375 bool is_committed) { 3376 unsigned int p = 0; 3377 switch (prot) { 3378 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 3379 case MEM_PROT_READ: p = PAGE_READONLY; break; 3380 case MEM_PROT_RW: p = PAGE_READWRITE; break; 3381 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 3382 default: 3383 ShouldNotReachHere(); 3384 } 3385 3386 DWORD old_status; 3387 3388 // Strange enough, but on Win32 one can change protection only for committed 3389 // memory, not a big deal anyway, as bytes less or equal than 64K 3390 if (!is_committed) { 3391 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX, 3392 "cannot commit protection page"); 3393 } 3394 // One cannot use os::guard_memory() here, as on Win32 guard page 3395 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 3396 // 3397 // Pages in the region become guard pages. Any attempt to access a guard page 3398 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 3399 // the guard page status. Guard pages thus act as a one-time access alarm. 3400 bool ret; 3401 if (UseNUMAInterleaving) { 3402 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time, 3403 // so we must protect the chunks individually. 3404 ret = protect_pages_individually(addr, bytes, p, &old_status); 3405 } else { 3406 ret = VirtualProtect(addr, bytes, p, &old_status) != 0; 3407 } 3408 #ifdef ASSERT 3409 if (!ret) { 3410 int err = os::get_last_error(); 3411 char buf[256]; 3412 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3413 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT 3414 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3415 buf_len != 0 ? buf : "<no_error_string>", err); 3416 } 3417 #endif 3418 return ret; 3419 } 3420 3421 bool os::guard_memory(char* addr, size_t bytes) { 3422 DWORD old_status; 3423 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 3424 } 3425 3426 bool os::unguard_memory(char* addr, size_t bytes) { 3427 DWORD old_status; 3428 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 3429 } 3430 3431 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3432 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3433 void os::numa_make_global(char *addr, size_t bytes) { } 3434 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 3435 bool os::numa_topology_changed() { return false; } 3436 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); } 3437 int os::numa_get_group_id() { return 0; } 3438 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 3439 if (numa_node_list_holder.get_count() == 0 && size > 0) { 3440 // Provide an answer for UMA systems 3441 ids[0] = 0; 3442 return 1; 3443 } else { 3444 // check for size bigger than actual groups_num 3445 size = MIN2(size, numa_get_groups_num()); 3446 for (int i = 0; i < (int)size; i++) { 3447 ids[i] = numa_node_list_holder.get_node_list_entry(i); 3448 } 3449 return size; 3450 } 3451 } 3452 3453 bool os::get_page_info(char *start, page_info* info) { 3454 return false; 3455 } 3456 3457 char *os::scan_pages(char *start, char* end, page_info* page_expected, 3458 page_info* page_found) { 3459 return end; 3460 } 3461 3462 char* os::non_memory_address_word() { 3463 // Must never look like an address returned by reserve_memory, 3464 // even in its subfields (as defined by the CPU immediate fields, 3465 // if the CPU splits constants across multiple instructions). 3466 return (char*)-1; 3467 } 3468 3469 #define MAX_ERROR_COUNT 100 3470 #define SYS_THREAD_ERROR 0xffffffffUL 3471 3472 void os::pd_start_thread(Thread* thread) { 3473 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 3474 // Returns previous suspend state: 3475 // 0: Thread was not suspended 3476 // 1: Thread is running now 3477 // >1: Thread is still suspended. 3478 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3479 } 3480 3481 3482 // Short sleep, direct OS call. 3483 // 3484 // ms = 0, means allow others (if any) to run. 3485 // 3486 void os::naked_short_sleep(jlong ms) { 3487 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3488 Sleep(ms); 3489 } 3490 3491 // Windows does not provide sleep functionality with nanosecond resolution, so we 3492 // try to approximate this with spinning combined with yielding if another thread 3493 // is ready to run on the current processor. 3494 void os::naked_short_nanosleep(jlong ns) { 3495 assert(ns > -1 && ns < NANOUNITS, "Un-interruptable sleep, short time use only"); 3496 3497 int64_t start = os::javaTimeNanos(); 3498 do { 3499 if (SwitchToThread() == 0) { 3500 // Nothing else is ready to run on this cpu, spin a little 3501 SpinPause(); 3502 } 3503 } while (os::javaTimeNanos() - start < ns); 3504 } 3505 3506 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3507 void os::infinite_sleep() { 3508 while (true) { // sleep forever ... 3509 Sleep(100000); // ... 100 seconds at a time 3510 } 3511 } 3512 3513 typedef BOOL (WINAPI * STTSignature)(void); 3514 3515 void os::naked_yield() { 3516 // Consider passing back the return value from SwitchToThread(). 3517 SwitchToThread(); 3518 } 3519 3520 // Win32 only gives you access to seven real priorities at a time, 3521 // so we compress Java's ten down to seven. It would be better 3522 // if we dynamically adjusted relative priorities. 3523 3524 int os::java_to_os_priority[CriticalPriority + 1] = { 3525 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3526 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3527 THREAD_PRIORITY_LOWEST, // 2 3528 THREAD_PRIORITY_BELOW_NORMAL, // 3 3529 THREAD_PRIORITY_BELOW_NORMAL, // 4 3530 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3531 THREAD_PRIORITY_NORMAL, // 6 3532 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3533 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3534 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3535 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority 3536 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority 3537 }; 3538 3539 int prio_policy1[CriticalPriority + 1] = { 3540 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3541 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3542 THREAD_PRIORITY_LOWEST, // 2 3543 THREAD_PRIORITY_BELOW_NORMAL, // 3 3544 THREAD_PRIORITY_BELOW_NORMAL, // 4 3545 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3546 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3547 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3548 THREAD_PRIORITY_HIGHEST, // 8 3549 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3550 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority 3551 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority 3552 }; 3553 3554 static int prio_init() { 3555 // If ThreadPriorityPolicy is 1, switch tables 3556 if (ThreadPriorityPolicy == 1) { 3557 int i; 3558 for (i = 0; i < CriticalPriority + 1; i++) { 3559 os::java_to_os_priority[i] = prio_policy1[i]; 3560 } 3561 } 3562 if (UseCriticalJavaThreadPriority) { 3563 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 3564 } 3565 return 0; 3566 } 3567 3568 OSReturn os::set_native_priority(Thread* thread, int priority) { 3569 if (!UseThreadPriorities) return OS_OK; 3570 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3571 return ret ? OS_OK : OS_ERR; 3572 } 3573 3574 OSReturn os::get_native_priority(const Thread* const thread, 3575 int* priority_ptr) { 3576 if (!UseThreadPriorities) { 3577 *priority_ptr = java_to_os_priority[NormPriority]; 3578 return OS_OK; 3579 } 3580 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3581 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3582 assert(false, "GetThreadPriority failed"); 3583 return OS_ERR; 3584 } 3585 *priority_ptr = os_prio; 3586 return OS_OK; 3587 } 3588 3589 // GetCurrentThreadId() returns DWORD 3590 intx os::current_thread_id() { return GetCurrentThreadId(); } 3591 3592 static int _initial_pid = 0; 3593 3594 int os::current_process_id() { 3595 return (_initial_pid ? _initial_pid : _getpid()); 3596 } 3597 3598 int os::win32::_vm_page_size = 0; 3599 int os::win32::_vm_allocation_granularity = 0; 3600 int os::win32::_processor_type = 0; 3601 // Processor level is not available on non-NT systems, use vm_version instead 3602 int os::win32::_processor_level = 0; 3603 julong os::win32::_physical_memory = 0; 3604 size_t os::win32::_default_stack_size = 0; 3605 3606 intx os::win32::_os_thread_limit = 0; 3607 volatile intx os::win32::_os_thread_count = 0; 3608 3609 bool os::win32::_is_windows_server = false; 3610 3611 // 6573254 3612 // Currently, the bug is observed across all the supported Windows releases, 3613 // including the latest one (as of this writing - Windows Server 2012 R2) 3614 bool os::win32::_has_exit_bug = true; 3615 3616 void os::win32::initialize_system_info() { 3617 SYSTEM_INFO si; 3618 GetSystemInfo(&si); 3619 _vm_page_size = si.dwPageSize; 3620 _vm_allocation_granularity = si.dwAllocationGranularity; 3621 _processor_type = si.dwProcessorType; 3622 _processor_level = si.wProcessorLevel; 3623 set_processor_count(si.dwNumberOfProcessors); 3624 3625 MEMORYSTATUSEX ms; 3626 ms.dwLength = sizeof(ms); 3627 3628 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3629 // dwMemoryLoad (% of memory in use) 3630 GlobalMemoryStatusEx(&ms); 3631 _physical_memory = ms.ullTotalPhys; 3632 3633 if (FLAG_IS_DEFAULT(MaxRAM)) { 3634 // Adjust MaxRAM according to the maximum virtual address space available. 3635 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual)); 3636 } 3637 3638 OSVERSIONINFOEX oi; 3639 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 3640 GetVersionEx((OSVERSIONINFO*)&oi); 3641 switch (oi.dwPlatformId) { 3642 case VER_PLATFORM_WIN32_NT: 3643 { 3644 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3645 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER || 3646 oi.wProductType == VER_NT_SERVER) { 3647 _is_windows_server = true; 3648 } 3649 } 3650 break; 3651 default: fatal("Unknown platform"); 3652 } 3653 3654 _default_stack_size = os::current_stack_size(); 3655 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3656 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3657 "stack size not a multiple of page size"); 3658 3659 initialize_performance_counter(); 3660 } 3661 3662 3663 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, 3664 int ebuflen) { 3665 char path[MAX_PATH]; 3666 DWORD size; 3667 DWORD pathLen = (DWORD)sizeof(path); 3668 HINSTANCE result = NULL; 3669 3670 // only allow library name without path component 3671 assert(strchr(name, '\\') == NULL, "path not allowed"); 3672 assert(strchr(name, ':') == NULL, "path not allowed"); 3673 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) { 3674 jio_snprintf(ebuf, ebuflen, 3675 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name); 3676 return NULL; 3677 } 3678 3679 // search system directory 3680 if ((size = GetSystemDirectory(path, pathLen)) > 0) { 3681 if (size >= pathLen) { 3682 return NULL; // truncated 3683 } 3684 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3685 return NULL; // truncated 3686 } 3687 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3688 return result; 3689 } 3690 } 3691 3692 // try Windows directory 3693 if ((size = GetWindowsDirectory(path, pathLen)) > 0) { 3694 if (size >= pathLen) { 3695 return NULL; // truncated 3696 } 3697 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3698 return NULL; // truncated 3699 } 3700 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3701 return result; 3702 } 3703 } 3704 3705 jio_snprintf(ebuf, ebuflen, 3706 "os::win32::load_windows_dll() cannot load %s from system directories.", name); 3707 return NULL; 3708 } 3709 3710 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS) 3711 #define EXIT_TIMEOUT 300000 /* 5 minutes */ 3712 3713 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) { 3714 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect); 3715 return TRUE; 3716 } 3717 3718 int os::win32::exit_process_or_thread(Ept what, int exit_code) { 3719 // Basic approach: 3720 // - Each exiting thread registers its intent to exit and then does so. 3721 // - A thread trying to terminate the process must wait for all 3722 // threads currently exiting to complete their exit. 3723 3724 if (os::win32::has_exit_bug()) { 3725 // The array holds handles of the threads that have started exiting by calling 3726 // _endthreadex(). 3727 // Should be large enough to avoid blocking the exiting thread due to lack of 3728 // a free slot. 3729 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP]; 3730 static int handle_count = 0; 3731 3732 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT; 3733 static CRITICAL_SECTION crit_sect; 3734 static volatile DWORD process_exiting = 0; 3735 int i, j; 3736 DWORD res; 3737 HANDLE hproc, hthr; 3738 3739 // We only attempt to register threads until a process exiting 3740 // thread manages to set the process_exiting flag. Any threads 3741 // that come through here after the process_exiting flag is set 3742 // are unregistered and will be caught in the SuspendThread() 3743 // infinite loop below. 3744 bool registered = false; 3745 3746 // The first thread that reached this point, initializes the critical section. 3747 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) { 3748 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__); 3749 } else if (OrderAccess::load_acquire(&process_exiting) == 0) { 3750 if (what != EPT_THREAD) { 3751 // Atomically set process_exiting before the critical section 3752 // to increase the visibility between racing threads. 3753 Atomic::cmpxchg(GetCurrentThreadId(), &process_exiting, (DWORD)0); 3754 } 3755 EnterCriticalSection(&crit_sect); 3756 3757 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) { 3758 // Remove from the array those handles of the threads that have completed exiting. 3759 for (i = 0, j = 0; i < handle_count; ++i) { 3760 res = WaitForSingleObject(handles[i], 0 /* don't wait */); 3761 if (res == WAIT_TIMEOUT) { 3762 handles[j++] = handles[i]; 3763 } else { 3764 if (res == WAIT_FAILED) { 3765 warning("WaitForSingleObject failed (%u) in %s: %d\n", 3766 GetLastError(), __FILE__, __LINE__); 3767 } 3768 // Don't keep the handle, if we failed waiting for it. 3769 CloseHandle(handles[i]); 3770 } 3771 } 3772 3773 // If there's no free slot in the array of the kept handles, we'll have to 3774 // wait until at least one thread completes exiting. 3775 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) { 3776 // Raise the priority of the oldest exiting thread to increase its chances 3777 // to complete sooner. 3778 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL); 3779 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT); 3780 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) { 3781 i = (res - WAIT_OBJECT_0); 3782 handle_count = MAXIMUM_THREADS_TO_KEEP - 1; 3783 for (; i < handle_count; ++i) { 3784 handles[i] = handles[i + 1]; 3785 } 3786 } else { 3787 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3788 (res == WAIT_FAILED ? "failed" : "timed out"), 3789 GetLastError(), __FILE__, __LINE__); 3790 // Don't keep handles, if we failed waiting for them. 3791 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) { 3792 CloseHandle(handles[i]); 3793 } 3794 handle_count = 0; 3795 } 3796 } 3797 3798 // Store a duplicate of the current thread handle in the array of handles. 3799 hproc = GetCurrentProcess(); 3800 hthr = GetCurrentThread(); 3801 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count], 3802 0, FALSE, DUPLICATE_SAME_ACCESS)) { 3803 warning("DuplicateHandle failed (%u) in %s: %d\n", 3804 GetLastError(), __FILE__, __LINE__); 3805 3806 // We can't register this thread (no more handles) so this thread 3807 // may be racing with a thread that is calling exit(). If the thread 3808 // that is calling exit() has managed to set the process_exiting 3809 // flag, then this thread will be caught in the SuspendThread() 3810 // infinite loop below which closes that race. A small timing 3811 // window remains before the process_exiting flag is set, but it 3812 // is only exposed when we are out of handles. 3813 } else { 3814 ++handle_count; 3815 registered = true; 3816 3817 // The current exiting thread has stored its handle in the array, and now 3818 // should leave the critical section before calling _endthreadex(). 3819 } 3820 3821 } else if (what != EPT_THREAD && handle_count > 0) { 3822 jlong start_time, finish_time, timeout_left; 3823 // Before ending the process, make sure all the threads that had called 3824 // _endthreadex() completed. 3825 3826 // Set the priority level of the current thread to the same value as 3827 // the priority level of exiting threads. 3828 // This is to ensure it will be given a fair chance to execute if 3829 // the timeout expires. 3830 hthr = GetCurrentThread(); 3831 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL); 3832 start_time = os::javaTimeNanos(); 3833 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L); 3834 for (i = 0; ; ) { 3835 int portion_count = handle_count - i; 3836 if (portion_count > MAXIMUM_WAIT_OBJECTS) { 3837 portion_count = MAXIMUM_WAIT_OBJECTS; 3838 } 3839 for (j = 0; j < portion_count; ++j) { 3840 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL); 3841 } 3842 timeout_left = (finish_time - start_time) / 1000000L; 3843 if (timeout_left < 0) { 3844 timeout_left = 0; 3845 } 3846 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left); 3847 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) { 3848 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3849 (res == WAIT_FAILED ? "failed" : "timed out"), 3850 GetLastError(), __FILE__, __LINE__); 3851 // Reset portion_count so we close the remaining 3852 // handles due to this error. 3853 portion_count = handle_count - i; 3854 } 3855 for (j = 0; j < portion_count; ++j) { 3856 CloseHandle(handles[i + j]); 3857 } 3858 if ((i += portion_count) >= handle_count) { 3859 break; 3860 } 3861 start_time = os::javaTimeNanos(); 3862 } 3863 handle_count = 0; 3864 } 3865 3866 LeaveCriticalSection(&crit_sect); 3867 } 3868 3869 if (!registered && 3870 OrderAccess::load_acquire(&process_exiting) != 0 && 3871 process_exiting != GetCurrentThreadId()) { 3872 // Some other thread is about to call exit(), so we don't let 3873 // the current unregistered thread proceed to exit() or _endthreadex() 3874 while (true) { 3875 SuspendThread(GetCurrentThread()); 3876 // Avoid busy-wait loop, if SuspendThread() failed. 3877 Sleep(EXIT_TIMEOUT); 3878 } 3879 } 3880 } 3881 3882 // We are here if either 3883 // - there's no 'race at exit' bug on this OS release; 3884 // - initialization of the critical section failed (unlikely); 3885 // - the current thread has registered itself and left the critical section; 3886 // - the process-exiting thread has raised the flag and left the critical section. 3887 if (what == EPT_THREAD) { 3888 _endthreadex((unsigned)exit_code); 3889 } else if (what == EPT_PROCESS) { 3890 ::exit(exit_code); 3891 } else { 3892 _exit(exit_code); 3893 } 3894 3895 // Should not reach here 3896 return exit_code; 3897 } 3898 3899 #undef EXIT_TIMEOUT 3900 3901 void os::win32::setmode_streams() { 3902 _setmode(_fileno(stdin), _O_BINARY); 3903 _setmode(_fileno(stdout), _O_BINARY); 3904 _setmode(_fileno(stderr), _O_BINARY); 3905 } 3906 3907 3908 bool os::is_debugger_attached() { 3909 return IsDebuggerPresent() ? true : false; 3910 } 3911 3912 3913 void os::wait_for_keypress_at_exit(void) { 3914 if (PauseAtExit) { 3915 fprintf(stderr, "Press any key to continue...\n"); 3916 fgetc(stdin); 3917 } 3918 } 3919 3920 3921 bool os::message_box(const char* title, const char* message) { 3922 int result = MessageBox(NULL, message, title, 3923 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 3924 return result == IDYES; 3925 } 3926 3927 #ifndef PRODUCT 3928 #ifndef _WIN64 3929 // Helpers to check whether NX protection is enabled 3930 int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 3931 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 3932 pex->ExceptionRecord->NumberParameters > 0 && 3933 pex->ExceptionRecord->ExceptionInformation[0] == 3934 EXCEPTION_INFO_EXEC_VIOLATION) { 3935 return EXCEPTION_EXECUTE_HANDLER; 3936 } 3937 return EXCEPTION_CONTINUE_SEARCH; 3938 } 3939 3940 void nx_check_protection() { 3941 // If NX is enabled we'll get an exception calling into code on the stack 3942 char code[] = { (char)0xC3 }; // ret 3943 void *code_ptr = (void *)code; 3944 __try { 3945 __asm call code_ptr 3946 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 3947 tty->print_raw_cr("NX protection detected."); 3948 } 3949 } 3950 #endif // _WIN64 3951 #endif // PRODUCT 3952 3953 // This is called _before_ the global arguments have been parsed 3954 void os::init(void) { 3955 _initial_pid = _getpid(); 3956 3957 init_random(1234567); 3958 3959 win32::initialize_system_info(); 3960 win32::setmode_streams(); 3961 init_page_sizes((size_t) win32::vm_page_size()); 3962 3963 // This may be overridden later when argument processing is done. 3964 FLAG_SET_ERGO(UseLargePagesIndividualAllocation, false); 3965 3966 // Initialize main_process and main_thread 3967 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 3968 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 3969 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 3970 fatal("DuplicateHandle failed\n"); 3971 } 3972 main_thread_id = (int) GetCurrentThreadId(); 3973 3974 // initialize fast thread access - only used for 32-bit 3975 win32::initialize_thread_ptr_offset(); 3976 } 3977 3978 // To install functions for atexit processing 3979 extern "C" { 3980 static void perfMemory_exit_helper() { 3981 perfMemory_exit(); 3982 } 3983 } 3984 3985 static jint initSock(); 3986 3987 // this is called _after_ the global arguments have been parsed 3988 jint os::init_2(void) { 3989 3990 // This could be set any time but all platforms 3991 // have to set it the same so we have to mirror Solaris. 3992 DEBUG_ONLY(os::set_mutex_init_done();) 3993 3994 // Setup Windows Exceptions 3995 3996 #if INCLUDE_AOT 3997 // If AOT is enabled we need to install a vectored exception handler 3998 // in order to forward implicit exceptions from code in AOT 3999 // generated DLLs. This is necessary since these DLLs are not 4000 // registered for structured exceptions like codecache methods are. 4001 if (AOTLibrary != NULL && (UseAOT || FLAG_IS_DEFAULT(UseAOT))) { 4002 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelVectoredExceptionFilter); 4003 } 4004 #endif 4005 4006 // for debugging float code generation bugs 4007 if (ForceFloatExceptions) { 4008 #ifndef _WIN64 4009 static long fp_control_word = 0; 4010 __asm { fstcw fp_control_word } 4011 // see Intel PPro Manual, Vol. 2, p 7-16 4012 const long precision = 0x20; 4013 const long underflow = 0x10; 4014 const long overflow = 0x08; 4015 const long zero_div = 0x04; 4016 const long denorm = 0x02; 4017 const long invalid = 0x01; 4018 fp_control_word |= invalid; 4019 __asm { fldcw fp_control_word } 4020 #endif 4021 } 4022 4023 // If stack_commit_size is 0, windows will reserve the default size, 4024 // but only commit a small portion of it. 4025 size_t stack_commit_size = align_up(ThreadStackSize*K, os::vm_page_size()); 4026 size_t default_reserve_size = os::win32::default_stack_size(); 4027 size_t actual_reserve_size = stack_commit_size; 4028 if (stack_commit_size < default_reserve_size) { 4029 // If stack_commit_size == 0, we want this too 4030 actual_reserve_size = default_reserve_size; 4031 } 4032 4033 // Check minimum allowable stack size for thread creation and to initialize 4034 // the java system classes, including StackOverflowError - depends on page 4035 // size. Add two 4K pages for compiler2 recursion in main thread. 4036 // Add in 4*BytesPerWord 4K pages to account for VM stack during 4037 // class initialization depending on 32 or 64 bit VM. 4038 size_t min_stack_allowed = 4039 (size_t)(JavaThread::stack_guard_zone_size() + 4040 JavaThread::stack_shadow_zone_size() + 4041 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K); 4042 4043 min_stack_allowed = align_up(min_stack_allowed, os::vm_page_size()); 4044 4045 if (actual_reserve_size < min_stack_allowed) { 4046 tty->print_cr("\nThe Java thread stack size specified is too small. " 4047 "Specify at least %dk", 4048 min_stack_allowed / K); 4049 return JNI_ERR; 4050 } 4051 4052 JavaThread::set_stack_size_at_create(stack_commit_size); 4053 4054 // Calculate theoretical max. size of Threads to guard gainst artifical 4055 // out-of-memory situations, where all available address-space has been 4056 // reserved by thread stacks. 4057 assert(actual_reserve_size != 0, "Must have a stack"); 4058 4059 // Calculate the thread limit when we should start doing Virtual Memory 4060 // banging. Currently when the threads will have used all but 200Mb of space. 4061 // 4062 // TODO: consider performing a similar calculation for commit size instead 4063 // as reserve size, since on a 64-bit platform we'll run into that more 4064 // often than running out of virtual memory space. We can use the 4065 // lower value of the two calculations as the os_thread_limit. 4066 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 4067 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 4068 4069 // at exit methods are called in the reverse order of their registration. 4070 // there is no limit to the number of functions registered. atexit does 4071 // not set errno. 4072 4073 if (PerfAllowAtExitRegistration) { 4074 // only register atexit functions if PerfAllowAtExitRegistration is set. 4075 // atexit functions can be delayed until process exit time, which 4076 // can be problematic for embedded VM situations. Embedded VMs should 4077 // call DestroyJavaVM() to assure that VM resources are released. 4078 4079 // note: perfMemory_exit_helper atexit function may be removed in 4080 // the future if the appropriate cleanup code can be added to the 4081 // VM_Exit VMOperation's doit method. 4082 if (atexit(perfMemory_exit_helper) != 0) { 4083 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 4084 } 4085 } 4086 4087 #ifndef _WIN64 4088 // Print something if NX is enabled (win32 on AMD64) 4089 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 4090 #endif 4091 4092 // initialize thread priority policy 4093 prio_init(); 4094 4095 if (UseNUMA && !ForceNUMA) { 4096 UseNUMA = false; // We don't fully support this yet 4097 } 4098 4099 if (UseNUMAInterleaving) { 4100 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag 4101 bool success = numa_interleaving_init(); 4102 if (!success) UseNUMAInterleaving = false; 4103 } 4104 4105 if (initSock() != JNI_OK) { 4106 return JNI_ERR; 4107 } 4108 4109 SymbolEngine::recalc_search_path(); 4110 4111 // Initialize data for jdk.internal.misc.Signal 4112 if (!ReduceSignalUsage) { 4113 jdk_misc_signal_init(); 4114 } 4115 4116 return JNI_OK; 4117 } 4118 4119 // Mark the polling page as unreadable 4120 void os::make_polling_page_unreadable(void) { 4121 DWORD old_status; 4122 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4123 PAGE_NOACCESS, &old_status)) { 4124 fatal("Could not disable polling page"); 4125 } 4126 } 4127 4128 // Mark the polling page as readable 4129 void os::make_polling_page_readable(void) { 4130 DWORD old_status; 4131 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4132 PAGE_READONLY, &old_status)) { 4133 fatal("Could not enable polling page"); 4134 } 4135 } 4136 4137 // combine the high and low DWORD into a ULONGLONG 4138 static ULONGLONG make_double_word(DWORD high_word, DWORD low_word) { 4139 ULONGLONG value = high_word; 4140 value <<= sizeof(high_word) * 8; 4141 value |= low_word; 4142 return value; 4143 } 4144 4145 // Transfers data from WIN32_FILE_ATTRIBUTE_DATA structure to struct stat 4146 static void file_attribute_data_to_stat(struct stat* sbuf, WIN32_FILE_ATTRIBUTE_DATA file_data) { 4147 ::memset((void*)sbuf, 0, sizeof(struct stat)); 4148 sbuf->st_size = (_off_t)make_double_word(file_data.nFileSizeHigh, file_data.nFileSizeLow); 4149 sbuf->st_mtime = make_double_word(file_data.ftLastWriteTime.dwHighDateTime, 4150 file_data.ftLastWriteTime.dwLowDateTime); 4151 sbuf->st_ctime = make_double_word(file_data.ftCreationTime.dwHighDateTime, 4152 file_data.ftCreationTime.dwLowDateTime); 4153 sbuf->st_atime = make_double_word(file_data.ftLastAccessTime.dwHighDateTime, 4154 file_data.ftLastAccessTime.dwLowDateTime); 4155 if ((file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0) { 4156 sbuf->st_mode |= S_IFDIR; 4157 } else { 4158 sbuf->st_mode |= S_IFREG; 4159 } 4160 } 4161 4162 // The following function is adapted from java.base/windows/native/libjava/canonicalize_md.c 4163 // Creates an UNC path from a single byte path. Return buffer is 4164 // allocated in C heap and needs to be freed by the caller. 4165 // Returns NULL on error. 4166 static wchar_t* create_unc_path(const char* path, errno_t &err) { 4167 wchar_t* wpath = NULL; 4168 size_t converted_chars = 0; 4169 size_t path_len = strlen(path) + 1; // includes the terminating NULL 4170 if (path[0] == '\\' && path[1] == '\\') { 4171 if (path[2] == '?' && path[3] == '\\'){ 4172 // if it already has a \\?\ don't do the prefix 4173 wpath = (wchar_t*)os::malloc(path_len * sizeof(wchar_t), mtInternal); 4174 if (wpath != NULL) { 4175 err = ::mbstowcs_s(&converted_chars, wpath, path_len, path, path_len); 4176 } else { 4177 err = ENOMEM; 4178 } 4179 } else { 4180 // only UNC pathname includes double slashes here 4181 wpath = (wchar_t*)os::malloc((path_len + 7) * sizeof(wchar_t), mtInternal); 4182 if (wpath != NULL) { 4183 ::wcscpy(wpath, L"\\\\?\\UNC\0"); 4184 err = ::mbstowcs_s(&converted_chars, &wpath[7], path_len, path, path_len); 4185 } else { 4186 err = ENOMEM; 4187 } 4188 } 4189 } else { 4190 wpath = (wchar_t*)os::malloc((path_len + 4) * sizeof(wchar_t), mtInternal); 4191 if (wpath != NULL) { 4192 ::wcscpy(wpath, L"\\\\?\\\0"); 4193 err = ::mbstowcs_s(&converted_chars, &wpath[4], path_len, path, path_len); 4194 } else { 4195 err = ENOMEM; 4196 } 4197 } 4198 return wpath; 4199 } 4200 4201 static void destroy_unc_path(wchar_t* wpath) { 4202 os::free(wpath); 4203 } 4204 4205 int os::stat(const char *path, struct stat *sbuf) { 4206 char* pathbuf = (char*)os::strdup(path, mtInternal); 4207 if (pathbuf == NULL) { 4208 errno = ENOMEM; 4209 return -1; 4210 } 4211 os::native_path(pathbuf); 4212 int ret; 4213 WIN32_FILE_ATTRIBUTE_DATA file_data; 4214 // Not using stat() to avoid the problem described in JDK-6539723 4215 if (strlen(path) < MAX_PATH) { 4216 BOOL bret = ::GetFileAttributesExA(pathbuf, GetFileExInfoStandard, &file_data); 4217 if (!bret) { 4218 errno = ::GetLastError(); 4219 ret = -1; 4220 } 4221 else { 4222 file_attribute_data_to_stat(sbuf, file_data); 4223 ret = 0; 4224 } 4225 } else { 4226 errno_t err = ERROR_SUCCESS; 4227 wchar_t* wpath = create_unc_path(pathbuf, err); 4228 if (err != ERROR_SUCCESS) { 4229 if (wpath != NULL) { 4230 destroy_unc_path(wpath); 4231 } 4232 os::free(pathbuf); 4233 errno = err; 4234 return -1; 4235 } 4236 BOOL bret = ::GetFileAttributesExW(wpath, GetFileExInfoStandard, &file_data); 4237 if (!bret) { 4238 errno = ::GetLastError(); 4239 ret = -1; 4240 } else { 4241 file_attribute_data_to_stat(sbuf, file_data); 4242 ret = 0; 4243 } 4244 destroy_unc_path(wpath); 4245 } 4246 os::free(pathbuf); 4247 return ret; 4248 } 4249 4250 static HANDLE create_read_only_file_handle(const char* file) { 4251 if (file == NULL) { 4252 return INVALID_HANDLE_VALUE; 4253 } 4254 4255 char* nativepath = (char*)os::strdup(file, mtInternal); 4256 if (nativepath == NULL) { 4257 errno = ENOMEM; 4258 return INVALID_HANDLE_VALUE; 4259 } 4260 os::native_path(nativepath); 4261 4262 size_t len = strlen(nativepath); 4263 HANDLE handle = INVALID_HANDLE_VALUE; 4264 4265 if (len < MAX_PATH) { 4266 handle = ::CreateFile(nativepath, 0, FILE_SHARE_READ, 4267 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4268 } else { 4269 errno_t err = ERROR_SUCCESS; 4270 wchar_t* wfile = create_unc_path(nativepath, err); 4271 if (err != ERROR_SUCCESS) { 4272 if (wfile != NULL) { 4273 destroy_unc_path(wfile); 4274 } 4275 os::free(nativepath); 4276 return INVALID_HANDLE_VALUE; 4277 } 4278 handle = ::CreateFileW(wfile, 0, FILE_SHARE_READ, 4279 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4280 destroy_unc_path(wfile); 4281 } 4282 4283 os::free(nativepath); 4284 return handle; 4285 } 4286 4287 bool os::same_files(const char* file1, const char* file2) { 4288 4289 if (file1 == NULL && file2 == NULL) { 4290 return true; 4291 } 4292 4293 if (file1 == NULL || file2 == NULL) { 4294 return false; 4295 } 4296 4297 if (strcmp(file1, file2) == 0) { 4298 return true; 4299 } 4300 4301 HANDLE handle1 = create_read_only_file_handle(file1); 4302 HANDLE handle2 = create_read_only_file_handle(file2); 4303 bool result = false; 4304 4305 // if we could open both paths... 4306 if (handle1 != INVALID_HANDLE_VALUE && handle2 != INVALID_HANDLE_VALUE) { 4307 BY_HANDLE_FILE_INFORMATION fileInfo1; 4308 BY_HANDLE_FILE_INFORMATION fileInfo2; 4309 if (::GetFileInformationByHandle(handle1, &fileInfo1) && 4310 ::GetFileInformationByHandle(handle2, &fileInfo2)) { 4311 // the paths are the same if they refer to the same file (fileindex) on the same volume (volume serial number) 4312 if (fileInfo1.dwVolumeSerialNumber == fileInfo2.dwVolumeSerialNumber && 4313 fileInfo1.nFileIndexHigh == fileInfo2.nFileIndexHigh && 4314 fileInfo1.nFileIndexLow == fileInfo2.nFileIndexLow) { 4315 result = true; 4316 } 4317 } 4318 } 4319 4320 //free the handles 4321 if (handle1 != INVALID_HANDLE_VALUE) { 4322 ::CloseHandle(handle1); 4323 } 4324 4325 if (handle2 != INVALID_HANDLE_VALUE) { 4326 ::CloseHandle(handle2); 4327 } 4328 4329 return result; 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 = (char*)os::strdup(path, mtInternal); 4442 if (pathbuf == NULL) { 4443 errno = ENOMEM; 4444 return -1; 4445 } 4446 os::native_path(pathbuf); 4447 int ret; 4448 if (strlen(path) < MAX_PATH) { 4449 ret = ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 4450 } else { 4451 errno_t err = ERROR_SUCCESS; 4452 wchar_t* wpath = create_unc_path(pathbuf, err); 4453 if (err != ERROR_SUCCESS) { 4454 if (wpath != NULL) { 4455 destroy_unc_path(wpath); 4456 } 4457 os::free(pathbuf); 4458 errno = err; 4459 return -1; 4460 } 4461 ret = ::_wopen(wpath, oflag | O_BINARY | O_NOINHERIT, mode); 4462 if (ret == -1) { 4463 errno = ::GetLastError(); 4464 } 4465 destroy_unc_path(wpath); 4466 } 4467 os::free(pathbuf); 4468 return ret; 4469 } 4470 4471 FILE* os::open(int fd, const char* mode) { 4472 return ::_fdopen(fd, mode); 4473 } 4474 4475 // Is a (classpath) directory empty? 4476 bool os::dir_is_empty(const char* path) { 4477 char* search_path = (char*)os::malloc(strlen(path) + 3, mtInternal); 4478 if (search_path == NULL) { 4479 errno = ENOMEM; 4480 return false; 4481 } 4482 strcpy(search_path, path); 4483 os::native_path(search_path); 4484 // Append "*", or possibly "\\*", to path 4485 if (search_path[1] == ':' && 4486 (search_path[2] == '\0' || 4487 (search_path[2] == '\\' && search_path[3] == '\0'))) { 4488 // No '\\' needed for cases like "Z:" or "Z:\" 4489 strcat(search_path, "*"); 4490 } 4491 else { 4492 strcat(search_path, "\\*"); 4493 } 4494 errno_t err = ERROR_SUCCESS; 4495 wchar_t* wpath = create_unc_path(search_path, err); 4496 if (err != ERROR_SUCCESS) { 4497 if (wpath != NULL) { 4498 destroy_unc_path(wpath); 4499 } 4500 os::free(search_path); 4501 errno = err; 4502 return false; 4503 } 4504 WIN32_FIND_DATAW fd; 4505 HANDLE f = ::FindFirstFileW(wpath, &fd); 4506 destroy_unc_path(wpath); 4507 bool is_empty = true; 4508 if (f != INVALID_HANDLE_VALUE) { 4509 while (is_empty && ::FindNextFileW(f, &fd)) { 4510 // An empty directory contains only the current directory file 4511 // and the previous directory file. 4512 if ((wcscmp(fd.cFileName, L".") != 0) && 4513 (wcscmp(fd.cFileName, L"..") != 0)) { 4514 is_empty = false; 4515 } 4516 } 4517 FindClose(f); 4518 } 4519 os::free(search_path); 4520 return is_empty; 4521 } 4522 4523 // create binary file, rewriting existing file if required 4524 int os::create_binary_file(const char* path, bool rewrite_existing) { 4525 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 4526 if (!rewrite_existing) { 4527 oflags |= _O_EXCL; 4528 } 4529 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 4530 } 4531 4532 // return current position of file pointer 4533 jlong os::current_file_offset(int fd) { 4534 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 4535 } 4536 4537 // move file pointer to the specified offset 4538 jlong os::seek_to_file_offset(int fd, jlong offset) { 4539 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 4540 } 4541 4542 4543 jlong os::lseek(int fd, jlong offset, int whence) { 4544 return (jlong) ::_lseeki64(fd, offset, whence); 4545 } 4546 4547 ssize_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 4548 OVERLAPPED ov; 4549 DWORD nread; 4550 BOOL result; 4551 4552 ZeroMemory(&ov, sizeof(ov)); 4553 ov.Offset = (DWORD)offset; 4554 ov.OffsetHigh = (DWORD)(offset >> 32); 4555 4556 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4557 4558 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov); 4559 4560 return result ? nread : 0; 4561 } 4562 4563 4564 // This method is a slightly reworked copy of JDK's sysNativePath 4565 // from src/windows/hpi/src/path_md.c 4566 4567 // Convert a pathname to native format. On win32, this involves forcing all 4568 // separators to be '\\' rather than '/' (both are legal inputs, but Win95 4569 // sometimes rejects '/') and removing redundant separators. The input path is 4570 // assumed to have been converted into the character encoding used by the local 4571 // system. Because this might be a double-byte encoding, care is taken to 4572 // treat double-byte lead characters correctly. 4573 // 4574 // This procedure modifies the given path in place, as the result is never 4575 // longer than the original. There is no error return; this operation always 4576 // succeeds. 4577 char * os::native_path(char *path) { 4578 char *src = path, *dst = path, *end = path; 4579 char *colon = NULL; // If a drive specifier is found, this will 4580 // point to the colon following the drive letter 4581 4582 // Assumption: '/', '\\', ':', and drive letters are never lead bytes 4583 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\')) 4584 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte"); 4585 4586 // Check for leading separators 4587 #define isfilesep(c) ((c) == '/' || (c) == '\\') 4588 while (isfilesep(*src)) { 4589 src++; 4590 } 4591 4592 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 4593 // Remove leading separators if followed by drive specifier. This 4594 // hack is necessary to support file URLs containing drive 4595 // specifiers (e.g., "file://c:/path"). As a side effect, 4596 // "/c:/path" can be used as an alternative to "c:/path". 4597 *dst++ = *src++; 4598 colon = dst; 4599 *dst++ = ':'; 4600 src++; 4601 } else { 4602 src = path; 4603 if (isfilesep(src[0]) && isfilesep(src[1])) { 4604 // UNC pathname: Retain first separator; leave src pointed at 4605 // second separator so that further separators will be collapsed 4606 // into the second separator. The result will be a pathname 4607 // beginning with "\\\\" followed (most likely) by a host name. 4608 src = dst = path + 1; 4609 path[0] = '\\'; // Force first separator to '\\' 4610 } 4611 } 4612 4613 end = dst; 4614 4615 // Remove redundant separators from remainder of path, forcing all 4616 // separators to be '\\' rather than '/'. Also, single byte space 4617 // characters are removed from the end of the path because those 4618 // are not legal ending characters on this operating system. 4619 // 4620 while (*src != '\0') { 4621 if (isfilesep(*src)) { 4622 *dst++ = '\\'; src++; 4623 while (isfilesep(*src)) src++; 4624 if (*src == '\0') { 4625 // Check for trailing separator 4626 end = dst; 4627 if (colon == dst - 2) break; // "z:\\" 4628 if (dst == path + 1) break; // "\\" 4629 if (dst == path + 2 && isfilesep(path[0])) { 4630 // "\\\\" is not collapsed to "\\" because "\\\\" marks the 4631 // beginning of a UNC pathname. Even though it is not, by 4632 // itself, a valid UNC pathname, we leave it as is in order 4633 // to be consistent with the path canonicalizer as well 4634 // as the win32 APIs, which treat this case as an invalid 4635 // UNC pathname rather than as an alias for the root 4636 // directory of the current drive. 4637 break; 4638 } 4639 end = --dst; // Path does not denote a root directory, so 4640 // remove trailing separator 4641 break; 4642 } 4643 end = dst; 4644 } else { 4645 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character 4646 *dst++ = *src++; 4647 if (*src) *dst++ = *src++; 4648 end = dst; 4649 } else { // Copy a single-byte character 4650 char c = *src++; 4651 *dst++ = c; 4652 // Space is not a legal ending character 4653 if (c != ' ') end = dst; 4654 } 4655 } 4656 } 4657 4658 *end = '\0'; 4659 4660 // For "z:", add "." to work around a bug in the C runtime library 4661 if (colon == dst - 1) { 4662 path[2] = '.'; 4663 path[3] = '\0'; 4664 } 4665 4666 return path; 4667 } 4668 4669 // This code is a copy of JDK's sysSetLength 4670 // from src/windows/hpi/src/sys_api_md.c 4671 4672 int os::ftruncate(int fd, jlong length) { 4673 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4674 long high = (long)(length >> 32); 4675 DWORD ret; 4676 4677 if (h == (HANDLE)(-1)) { 4678 return -1; 4679 } 4680 4681 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 4682 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 4683 return -1; 4684 } 4685 4686 if (::SetEndOfFile(h) == FALSE) { 4687 return -1; 4688 } 4689 4690 return 0; 4691 } 4692 4693 int os::get_fileno(FILE* fp) { 4694 return _fileno(fp); 4695 } 4696 4697 // This code is a copy of JDK's sysSync 4698 // from src/windows/hpi/src/sys_api_md.c 4699 // except for the legacy workaround for a bug in Win 98 4700 4701 int os::fsync(int fd) { 4702 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 4703 4704 if ((!::FlushFileBuffers(handle)) && 4705 (GetLastError() != ERROR_ACCESS_DENIED)) { 4706 // from winerror.h 4707 return -1; 4708 } 4709 return 0; 4710 } 4711 4712 static int nonSeekAvailable(int, long *); 4713 static int stdinAvailable(int, long *); 4714 4715 // This code is a copy of JDK's sysAvailable 4716 // from src/windows/hpi/src/sys_api_md.c 4717 4718 int os::available(int fd, jlong *bytes) { 4719 jlong cur, end; 4720 struct _stati64 stbuf64; 4721 4722 if (::_fstati64(fd, &stbuf64) >= 0) { 4723 int mode = stbuf64.st_mode; 4724 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 4725 int ret; 4726 long lpbytes; 4727 if (fd == 0) { 4728 ret = stdinAvailable(fd, &lpbytes); 4729 } else { 4730 ret = nonSeekAvailable(fd, &lpbytes); 4731 } 4732 (*bytes) = (jlong)(lpbytes); 4733 return ret; 4734 } 4735 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 4736 return FALSE; 4737 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 4738 return FALSE; 4739 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 4740 return FALSE; 4741 } 4742 *bytes = end - cur; 4743 return TRUE; 4744 } else { 4745 return FALSE; 4746 } 4747 } 4748 4749 void os::flockfile(FILE* fp) { 4750 _lock_file(fp); 4751 } 4752 4753 void os::funlockfile(FILE* fp) { 4754 _unlock_file(fp); 4755 } 4756 4757 // This code is a copy of JDK's nonSeekAvailable 4758 // from src/windows/hpi/src/sys_api_md.c 4759 4760 static int nonSeekAvailable(int fd, long *pbytes) { 4761 // This is used for available on non-seekable devices 4762 // (like both named and anonymous pipes, such as pipes 4763 // connected to an exec'd process). 4764 // Standard Input is a special case. 4765 HANDLE han; 4766 4767 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 4768 return FALSE; 4769 } 4770 4771 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 4772 // PeekNamedPipe fails when at EOF. In that case we 4773 // simply make *pbytes = 0 which is consistent with the 4774 // behavior we get on Solaris when an fd is at EOF. 4775 // The only alternative is to raise an Exception, 4776 // which isn't really warranted. 4777 // 4778 if (::GetLastError() != ERROR_BROKEN_PIPE) { 4779 return FALSE; 4780 } 4781 *pbytes = 0; 4782 } 4783 return TRUE; 4784 } 4785 4786 #define MAX_INPUT_EVENTS 2000 4787 4788 // This code is a copy of JDK's stdinAvailable 4789 // from src/windows/hpi/src/sys_api_md.c 4790 4791 static int stdinAvailable(int fd, long *pbytes) { 4792 HANDLE han; 4793 DWORD numEventsRead = 0; // Number of events read from buffer 4794 DWORD numEvents = 0; // Number of events in buffer 4795 DWORD i = 0; // Loop index 4796 DWORD curLength = 0; // Position marker 4797 DWORD actualLength = 0; // Number of bytes readable 4798 BOOL error = FALSE; // Error holder 4799 INPUT_RECORD *lpBuffer; // Pointer to records of input events 4800 4801 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4802 return FALSE; 4803 } 4804 4805 // Construct an array of input records in the console buffer 4806 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4807 if (error == 0) { 4808 return nonSeekAvailable(fd, pbytes); 4809 } 4810 4811 // lpBuffer must fit into 64K or else PeekConsoleInput fails 4812 if (numEvents > MAX_INPUT_EVENTS) { 4813 numEvents = MAX_INPUT_EVENTS; 4814 } 4815 4816 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal); 4817 if (lpBuffer == NULL) { 4818 return FALSE; 4819 } 4820 4821 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4822 if (error == 0) { 4823 os::free(lpBuffer); 4824 return FALSE; 4825 } 4826 4827 // Examine input records for the number of bytes available 4828 for (i=0; i<numEvents; i++) { 4829 if (lpBuffer[i].EventType == KEY_EVENT) { 4830 4831 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4832 &(lpBuffer[i].Event); 4833 if (keyRecord->bKeyDown == TRUE) { 4834 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4835 curLength++; 4836 if (*keyPressed == '\r') { 4837 actualLength = curLength; 4838 } 4839 } 4840 } 4841 } 4842 4843 if (lpBuffer != NULL) { 4844 os::free(lpBuffer); 4845 } 4846 4847 *pbytes = (long) actualLength; 4848 return TRUE; 4849 } 4850 4851 // Map a block of memory. 4852 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4853 char *addr, size_t bytes, bool read_only, 4854 bool allow_exec) { 4855 HANDLE hFile; 4856 char* base; 4857 4858 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4859 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4860 if (hFile == NULL) { 4861 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError()); 4862 return NULL; 4863 } 4864 4865 if (allow_exec) { 4866 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4867 // unless it comes from a PE image (which the shared archive is not.) 4868 // Even VirtualProtect refuses to give execute access to mapped memory 4869 // that was not previously executable. 4870 // 4871 // Instead, stick the executable region in anonymous memory. Yuck. 4872 // Penalty is that ~4 pages will not be shareable - in the future 4873 // we might consider DLLizing the shared archive with a proper PE 4874 // header so that mapping executable + sharing is possible. 4875 4876 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4877 PAGE_READWRITE); 4878 if (base == NULL) { 4879 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError()); 4880 CloseHandle(hFile); 4881 return NULL; 4882 } 4883 4884 // Record virtual memory allocation 4885 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC); 4886 4887 DWORD bytes_read; 4888 OVERLAPPED overlapped; 4889 overlapped.Offset = (DWORD)file_offset; 4890 overlapped.OffsetHigh = 0; 4891 overlapped.hEvent = NULL; 4892 // ReadFile guarantees that if the return value is true, the requested 4893 // number of bytes were read before returning. 4894 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 4895 if (!res) { 4896 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError()); 4897 release_memory(base, bytes); 4898 CloseHandle(hFile); 4899 return NULL; 4900 } 4901 } else { 4902 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 4903 NULL /* file_name */); 4904 if (hMap == NULL) { 4905 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError()); 4906 CloseHandle(hFile); 4907 return NULL; 4908 } 4909 4910 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 4911 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 4912 (DWORD)bytes, addr); 4913 if (base == NULL) { 4914 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError()); 4915 CloseHandle(hMap); 4916 CloseHandle(hFile); 4917 return NULL; 4918 } 4919 4920 if (CloseHandle(hMap) == 0) { 4921 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError()); 4922 CloseHandle(hFile); 4923 return base; 4924 } 4925 } 4926 4927 if (allow_exec) { 4928 DWORD old_protect; 4929 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 4930 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 4931 4932 if (!res) { 4933 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError()); 4934 // Don't consider this a hard error, on IA32 even if the 4935 // VirtualProtect fails, we should still be able to execute 4936 CloseHandle(hFile); 4937 return base; 4938 } 4939 } 4940 4941 if (CloseHandle(hFile) == 0) { 4942 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError()); 4943 return base; 4944 } 4945 4946 return base; 4947 } 4948 4949 4950 // Remap a block of memory. 4951 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4952 char *addr, size_t bytes, bool read_only, 4953 bool allow_exec) { 4954 // This OS does not allow existing memory maps to be remapped so we 4955 // would have to unmap the memory before we remap it. 4956 4957 // Because there is a small window between unmapping memory and mapping 4958 // it in again with different protections, CDS archives are mapped RW 4959 // on windows, so this function isn't called. 4960 ShouldNotReachHere(); 4961 return NULL; 4962 } 4963 4964 4965 // Unmap a block of memory. 4966 // Returns true=success, otherwise false. 4967 4968 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4969 MEMORY_BASIC_INFORMATION mem_info; 4970 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) { 4971 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError()); 4972 return false; 4973 } 4974 4975 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx. 4976 // Instead, executable region was allocated using VirtualAlloc(). See 4977 // pd_map_memory() above. 4978 // 4979 // The following flags should match the 'exec_access' flages used for 4980 // VirtualProtect() in pd_map_memory(). 4981 if (mem_info.Protect == PAGE_EXECUTE_READ || 4982 mem_info.Protect == PAGE_EXECUTE_READWRITE) { 4983 return pd_release_memory(addr, bytes); 4984 } 4985 4986 BOOL result = UnmapViewOfFile(addr); 4987 if (result == 0) { 4988 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError()); 4989 return false; 4990 } 4991 return true; 4992 } 4993 4994 void os::pause() { 4995 char filename[MAX_PATH]; 4996 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4997 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4998 } else { 4999 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 5000 } 5001 5002 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 5003 if (fd != -1) { 5004 struct stat buf; 5005 ::close(fd); 5006 while (::stat(filename, &buf) == 0) { 5007 Sleep(100); 5008 } 5009 } else { 5010 jio_fprintf(stderr, 5011 "Could not open pause file '%s', continuing immediately.\n", filename); 5012 } 5013 } 5014 5015 Thread* os::ThreadCrashProtection::_protected_thread = NULL; 5016 os::ThreadCrashProtection* os::ThreadCrashProtection::_crash_protection = NULL; 5017 volatile intptr_t os::ThreadCrashProtection::_crash_mux = 0; 5018 5019 os::ThreadCrashProtection::ThreadCrashProtection() { 5020 } 5021 5022 // See the caveats for this class in os_windows.hpp 5023 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back 5024 // into this method and returns false. If no OS EXCEPTION was raised, returns 5025 // true. 5026 // The callback is supposed to provide the method that should be protected. 5027 // 5028 bool os::ThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 5029 5030 Thread::muxAcquire(&_crash_mux, "CrashProtection"); 5031 5032 _protected_thread = Thread::current_or_null(); 5033 assert(_protected_thread != NULL, "Cannot crash protect a NULL thread"); 5034 5035 bool success = true; 5036 __try { 5037 _crash_protection = this; 5038 cb.call(); 5039 } __except(EXCEPTION_EXECUTE_HANDLER) { 5040 // only for protection, nothing to do 5041 success = false; 5042 } 5043 _crash_protection = NULL; 5044 _protected_thread = NULL; 5045 Thread::muxRelease(&_crash_mux); 5046 return success; 5047 } 5048 5049 5050 class HighResolutionInterval : public CHeapObj<mtThread> { 5051 // The default timer resolution seems to be 10 milliseconds. 5052 // (Where is this written down?) 5053 // If someone wants to sleep for only a fraction of the default, 5054 // then we set the timer resolution down to 1 millisecond for 5055 // the duration of their interval. 5056 // We carefully set the resolution back, since otherwise we 5057 // seem to incur an overhead (3%?) that we don't need. 5058 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 5059 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 5060 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 5061 // timeBeginPeriod() if the relative error exceeded some threshold. 5062 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 5063 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 5064 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 5065 // resolution timers running. 5066 private: 5067 jlong resolution; 5068 public: 5069 HighResolutionInterval(jlong ms) { 5070 resolution = ms % 10L; 5071 if (resolution != 0) { 5072 MMRESULT result = timeBeginPeriod(1L); 5073 } 5074 } 5075 ~HighResolutionInterval() { 5076 if (resolution != 0) { 5077 MMRESULT result = timeEndPeriod(1L); 5078 } 5079 resolution = 0L; 5080 } 5081 }; 5082 5083 // An Event wraps a win32 "CreateEvent" kernel handle. 5084 // 5085 // We have a number of choices regarding "CreateEvent" win32 handle leakage: 5086 // 5087 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 5088 // field, and call CloseHandle() on the win32 event handle. Unpark() would 5089 // need to be modified to tolerate finding a NULL (invalid) win32 event handle. 5090 // In addition, an unpark() operation might fetch the handle field, but the 5091 // event could recycle between the fetch and the SetEvent() operation. 5092 // SetEvent() would either fail because the handle was invalid, or inadvertently work, 5093 // as the win32 handle value had been recycled. In an ideal world calling SetEvent() 5094 // on an stale but recycled handle would be harmless, but in practice this might 5095 // confuse other non-Sun code, so it's not a viable approach. 5096 // 5097 // 2: Once a win32 event handle is associated with an Event, it remains associated 5098 // with the Event. The event handle is never closed. This could be construed 5099 // as handle leakage, but only up to the maximum # of threads that have been extant 5100 // at any one time. This shouldn't be an issue, as windows platforms typically 5101 // permit a process to have hundreds of thousands of open handles. 5102 // 5103 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 5104 // and release unused handles. 5105 // 5106 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 5107 // It's not clear, however, that we wouldn't be trading one type of leak for another. 5108 // 5109 // 5. Use an RCU-like mechanism (Read-Copy Update). 5110 // Or perhaps something similar to Maged Michael's "Hazard pointers". 5111 // 5112 // We use (2). 5113 // 5114 // TODO-FIXME: 5115 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 5116 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 5117 // to recover from (or at least detect) the dreaded Windows 841176 bug. 5118 // 3. Collapse the JSR166 parker event, and the objectmonitor ParkEvent 5119 // into a single win32 CreateEvent() handle. 5120 // 5121 // Assumption: 5122 // Only one parker can exist on an event, which is why we allocate 5123 // them per-thread. Multiple unparkers can coexist. 5124 // 5125 // _Event transitions in park() 5126 // -1 => -1 : illegal 5127 // 1 => 0 : pass - return immediately 5128 // 0 => -1 : block; then set _Event to 0 before returning 5129 // 5130 // _Event transitions in unpark() 5131 // 0 => 1 : just return 5132 // 1 => 1 : just return 5133 // -1 => either 0 or 1; must signal target thread 5134 // That is, we can safely transition _Event from -1 to either 5135 // 0 or 1. 5136 // 5137 // _Event serves as a restricted-range semaphore. 5138 // -1 : thread is blocked, i.e. there is a waiter 5139 // 0 : neutral: thread is running or ready, 5140 // could have been signaled after a wait started 5141 // 1 : signaled - thread is running or ready 5142 // 5143 // Another possible encoding of _Event would be with 5144 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5145 // 5146 5147 int os::PlatformEvent::park(jlong Millis) { 5148 // Transitions for _Event: 5149 // -1 => -1 : illegal 5150 // 1 => 0 : pass - return immediately 5151 // 0 => -1 : block; then set _Event to 0 before returning 5152 5153 guarantee(_ParkHandle != NULL , "Invariant"); 5154 guarantee(Millis > 0 , "Invariant"); 5155 5156 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 5157 // the initial park() operation. 5158 // Consider: use atomic decrement instead of CAS-loop 5159 5160 int v; 5161 for (;;) { 5162 v = _Event; 5163 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5164 } 5165 guarantee((v == 0) || (v == 1), "invariant"); 5166 if (v != 0) return OS_OK; 5167 5168 // Do this the hard way by blocking ... 5169 // TODO: consider a brief spin here, gated on the success of recent 5170 // spin attempts by this thread. 5171 // 5172 // We decompose long timeouts into series of shorter timed waits. 5173 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 5174 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 5175 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 5176 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 5177 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 5178 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 5179 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 5180 // for the already waited time. This policy does not admit any new outcomes. 5181 // In the future, however, we might want to track the accumulated wait time and 5182 // adjust Millis accordingly if we encounter a spurious wakeup. 5183 5184 const int MAXTIMEOUT = 0x10000000; 5185 DWORD rv = WAIT_TIMEOUT; 5186 while (_Event < 0 && Millis > 0) { 5187 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT) 5188 if (Millis > MAXTIMEOUT) { 5189 prd = MAXTIMEOUT; 5190 } 5191 HighResolutionInterval *phri = NULL; 5192 if (!ForceTimeHighResolution) { 5193 phri = new HighResolutionInterval(prd); 5194 } 5195 rv = ::WaitForSingleObject(_ParkHandle, prd); 5196 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed"); 5197 if (rv == WAIT_TIMEOUT) { 5198 Millis -= prd; 5199 } 5200 delete phri; // if it is NULL, harmless 5201 } 5202 v = _Event; 5203 _Event = 0; 5204 // see comment at end of os::PlatformEvent::park() below: 5205 OrderAccess::fence(); 5206 // If we encounter a nearly simultanous timeout expiry and unpark() 5207 // we return OS_OK indicating we awoke via unpark(). 5208 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 5209 return (v >= 0) ? OS_OK : OS_TIMEOUT; 5210 } 5211 5212 void os::PlatformEvent::park() { 5213 // Transitions for _Event: 5214 // -1 => -1 : illegal 5215 // 1 => 0 : pass - return immediately 5216 // 0 => -1 : block; then set _Event to 0 before returning 5217 5218 guarantee(_ParkHandle != NULL, "Invariant"); 5219 // Invariant: Only the thread associated with the Event/PlatformEvent 5220 // may call park(). 5221 // Consider: use atomic decrement instead of CAS-loop 5222 int v; 5223 for (;;) { 5224 v = _Event; 5225 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5226 } 5227 guarantee((v == 0) || (v == 1), "invariant"); 5228 if (v != 0) return; 5229 5230 // Do this the hard way by blocking ... 5231 // TODO: consider a brief spin here, gated on the success of recent 5232 // spin attempts by this thread. 5233 while (_Event < 0) { 5234 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE); 5235 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed"); 5236 } 5237 5238 // Usually we'll find _Event == 0 at this point, but as 5239 // an optional optimization we clear it, just in case can 5240 // multiple unpark() operations drove _Event up to 1. 5241 _Event = 0; 5242 OrderAccess::fence(); 5243 guarantee(_Event >= 0, "invariant"); 5244 } 5245 5246 void os::PlatformEvent::unpark() { 5247 guarantee(_ParkHandle != NULL, "Invariant"); 5248 5249 // Transitions for _Event: 5250 // 0 => 1 : just return 5251 // 1 => 1 : just return 5252 // -1 => either 0 or 1; must signal target thread 5253 // That is, we can safely transition _Event from -1 to either 5254 // 0 or 1. 5255 // See also: "Semaphores in Plan 9" by Mullender & Cox 5256 // 5257 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5258 // that it will take two back-to-back park() calls for the owning 5259 // thread to block. This has the benefit of forcing a spurious return 5260 // from the first park() call after an unpark() call which will help 5261 // shake out uses of park() and unpark() without condition variables. 5262 5263 if (Atomic::xchg(1, &_Event) >= 0) return; 5264 5265 ::SetEvent(_ParkHandle); 5266 } 5267 5268 5269 // JSR166 5270 // ------------------------------------------------------- 5271 5272 // The Windows implementation of Park is very straightforward: Basic 5273 // operations on Win32 Events turn out to have the right semantics to 5274 // use them directly. We opportunistically resuse the event inherited 5275 // from Monitor. 5276 5277 void Parker::park(bool isAbsolute, jlong time) { 5278 guarantee(_ParkEvent != NULL, "invariant"); 5279 // First, demultiplex/decode time arguments 5280 if (time < 0) { // don't wait 5281 return; 5282 } else if (time == 0 && !isAbsolute) { 5283 time = INFINITE; 5284 } else if (isAbsolute) { 5285 time -= os::javaTimeMillis(); // convert to relative time 5286 if (time <= 0) { // already elapsed 5287 return; 5288 } 5289 } else { // relative 5290 time /= 1000000; // Must coarsen from nanos to millis 5291 if (time == 0) { // Wait for the minimal time unit if zero 5292 time = 1; 5293 } 5294 } 5295 5296 JavaThread* thread = JavaThread::current(); 5297 5298 // Don't wait if interrupted or already triggered 5299 if (thread->is_interrupted(false) || 5300 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 5301 ResetEvent(_ParkEvent); 5302 return; 5303 } else { 5304 ThreadBlockInVM tbivm(thread); 5305 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5306 thread->set_suspend_equivalent(); 5307 5308 WaitForSingleObject(_ParkEvent, time); 5309 ResetEvent(_ParkEvent); 5310 5311 // If externally suspended while waiting, re-suspend 5312 if (thread->handle_special_suspend_equivalent_condition()) { 5313 thread->java_suspend_self(); 5314 } 5315 } 5316 } 5317 5318 void Parker::unpark() { 5319 guarantee(_ParkEvent != NULL, "invariant"); 5320 SetEvent(_ParkEvent); 5321 } 5322 5323 // Platform Monitor implementation 5324 5325 // Must already be locked 5326 int os::PlatformMonitor::wait(jlong millis) { 5327 assert(millis >= 0, "negative timeout"); 5328 int ret = OS_TIMEOUT; 5329 int status = SleepConditionVariableCS(&_cond, &_mutex, 5330 millis == 0 ? INFINITE : millis); 5331 if (status != 0) { 5332 ret = OS_OK; 5333 } 5334 #ifndef PRODUCT 5335 else { 5336 DWORD err = GetLastError(); 5337 assert(err == ERROR_TIMEOUT, "SleepConditionVariableCS: %ld:", err); 5338 } 5339 #endif 5340 return ret; 5341 } 5342 5343 // Run the specified command in a separate process. Return its exit value, 5344 // or -1 on failure (e.g. can't create a new process). 5345 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) { 5346 STARTUPINFO si; 5347 PROCESS_INFORMATION pi; 5348 DWORD exit_code; 5349 5350 char * cmd_string; 5351 const char * cmd_prefix = "cmd /C "; 5352 size_t len = strlen(cmd) + strlen(cmd_prefix) + 1; 5353 cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal); 5354 if (cmd_string == NULL) { 5355 return -1; 5356 } 5357 cmd_string[0] = '\0'; 5358 strcat(cmd_string, cmd_prefix); 5359 strcat(cmd_string, cmd); 5360 5361 // now replace all '\n' with '&' 5362 char * substring = cmd_string; 5363 while ((substring = strchr(substring, '\n')) != NULL) { 5364 substring[0] = '&'; 5365 substring++; 5366 } 5367 memset(&si, 0, sizeof(si)); 5368 si.cb = sizeof(si); 5369 memset(&pi, 0, sizeof(pi)); 5370 BOOL rslt = CreateProcess(NULL, // executable name - use command line 5371 cmd_string, // command line 5372 NULL, // process security attribute 5373 NULL, // thread security attribute 5374 TRUE, // inherits system handles 5375 0, // no creation flags 5376 NULL, // use parent's environment block 5377 NULL, // use parent's starting directory 5378 &si, // (in) startup information 5379 &pi); // (out) process information 5380 5381 if (rslt) { 5382 // Wait until child process exits. 5383 WaitForSingleObject(pi.hProcess, INFINITE); 5384 5385 GetExitCodeProcess(pi.hProcess, &exit_code); 5386 5387 // Close process and thread handles. 5388 CloseHandle(pi.hProcess); 5389 CloseHandle(pi.hThread); 5390 } else { 5391 exit_code = -1; 5392 } 5393 5394 FREE_C_HEAP_ARRAY(char, cmd_string); 5395 return (int)exit_code; 5396 } 5397 5398 bool os::find(address addr, outputStream* st) { 5399 int offset = -1; 5400 bool result = false; 5401 char buf[256]; 5402 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) { 5403 st->print(PTR_FORMAT " ", addr); 5404 if (strlen(buf) < sizeof(buf) - 1) { 5405 char* p = strrchr(buf, '\\'); 5406 if (p) { 5407 st->print("%s", p + 1); 5408 } else { 5409 st->print("%s", buf); 5410 } 5411 } else { 5412 // The library name is probably truncated. Let's omit the library name. 5413 // See also JDK-8147512. 5414 } 5415 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) { 5416 st->print("::%s + 0x%x", buf, offset); 5417 } 5418 st->cr(); 5419 result = true; 5420 } 5421 return result; 5422 } 5423 5424 static jint initSock() { 5425 WSADATA wsadata; 5426 5427 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) { 5428 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n", 5429 ::GetLastError()); 5430 return JNI_ERR; 5431 } 5432 return JNI_OK; 5433 } 5434 5435 struct hostent* os::get_host_by_name(char* name) { 5436 return (struct hostent*)gethostbyname(name); 5437 } 5438 5439 int os::socket_close(int fd) { 5440 return ::closesocket(fd); 5441 } 5442 5443 int os::socket(int domain, int type, int protocol) { 5444 return ::socket(domain, type, protocol); 5445 } 5446 5447 int os::connect(int fd, struct sockaddr* him, socklen_t len) { 5448 return ::connect(fd, him, len); 5449 } 5450 5451 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5452 return ::recv(fd, buf, (int)nBytes, flags); 5453 } 5454 5455 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5456 return ::send(fd, buf, (int)nBytes, flags); 5457 } 5458 5459 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5460 return ::send(fd, buf, (int)nBytes, flags); 5461 } 5462 5463 // WINDOWS CONTEXT Flags for THREAD_SAMPLING 5464 #if defined(IA32) 5465 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS) 5466 #elif defined (AMD64) 5467 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT) 5468 #endif 5469 5470 // returns true if thread could be suspended, 5471 // false otherwise 5472 static bool do_suspend(HANDLE* h) { 5473 if (h != NULL) { 5474 if (SuspendThread(*h) != ~0) { 5475 return true; 5476 } 5477 } 5478 return false; 5479 } 5480 5481 // resume the thread 5482 // calling resume on an active thread is a no-op 5483 static void do_resume(HANDLE* h) { 5484 if (h != NULL) { 5485 ResumeThread(*h); 5486 } 5487 } 5488 5489 // retrieve a suspend/resume context capable handle 5490 // from the tid. Caller validates handle return value. 5491 void get_thread_handle_for_extended_context(HANDLE* h, 5492 OSThread::thread_id_t tid) { 5493 if (h != NULL) { 5494 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid); 5495 } 5496 } 5497 5498 // Thread sampling implementation 5499 // 5500 void os::SuspendedThreadTask::internal_do_task() { 5501 CONTEXT ctxt; 5502 HANDLE h = NULL; 5503 5504 // get context capable handle for thread 5505 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id()); 5506 5507 // sanity 5508 if (h == NULL || h == INVALID_HANDLE_VALUE) { 5509 return; 5510 } 5511 5512 // suspend the thread 5513 if (do_suspend(&h)) { 5514 ctxt.ContextFlags = sampling_context_flags; 5515 // get thread context 5516 GetThreadContext(h, &ctxt); 5517 SuspendedThreadTaskContext context(_thread, &ctxt); 5518 // pass context to Thread Sampling impl 5519 do_task(context); 5520 // resume thread 5521 do_resume(&h); 5522 } 5523 5524 // close handle 5525 CloseHandle(h); 5526 } 5527 5528 bool os::start_debugging(char *buf, int buflen) { 5529 int len = (int)strlen(buf); 5530 char *p = &buf[len]; 5531 5532 jio_snprintf(p, buflen-len, 5533 "\n\n" 5534 "Do you want to debug the problem?\n\n" 5535 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n" 5536 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n" 5537 "Otherwise, select 'No' to abort...", 5538 os::current_process_id(), os::current_thread_id()); 5539 5540 bool yes = os::message_box("Unexpected Error", buf); 5541 5542 if (yes) { 5543 // os::breakpoint() calls DebugBreak(), which causes a breakpoint 5544 // exception. If VM is running inside a debugger, the debugger will 5545 // catch the exception. Otherwise, the breakpoint exception will reach 5546 // the default windows exception handler, which can spawn a debugger and 5547 // automatically attach to the dying VM. 5548 os::breakpoint(); 5549 yes = false; 5550 } 5551 return yes; 5552 } 5553 5554 void* os::get_default_process_handle() { 5555 return (void*)GetModuleHandle(NULL); 5556 } 5557 5558 // Builds a platform dependent Agent_OnLoad_<lib_name> function name 5559 // which is used to find statically linked in agents. 5560 // Additionally for windows, takes into account __stdcall names. 5561 // Parameters: 5562 // sym_name: Symbol in library we are looking for 5563 // lib_name: Name of library to look in, NULL for shared libs. 5564 // is_absolute_path == true if lib_name is absolute path to agent 5565 // such as "C:/a/b/L.dll" 5566 // == false if only the base name of the library is passed in 5567 // such as "L" 5568 char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 5569 bool is_absolute_path) { 5570 char *agent_entry_name; 5571 size_t len; 5572 size_t name_len; 5573 size_t prefix_len = strlen(JNI_LIB_PREFIX); 5574 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 5575 const char *start; 5576 5577 if (lib_name != NULL) { 5578 len = name_len = strlen(lib_name); 5579 if (is_absolute_path) { 5580 // Need to strip path, prefix and suffix 5581 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 5582 lib_name = ++start; 5583 } else { 5584 // Need to check for drive prefix 5585 if ((start = strchr(lib_name, ':')) != NULL) { 5586 lib_name = ++start; 5587 } 5588 } 5589 if (len <= (prefix_len + suffix_len)) { 5590 return NULL; 5591 } 5592 lib_name += prefix_len; 5593 name_len = strlen(lib_name) - suffix_len; 5594 } 5595 } 5596 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 5597 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 5598 if (agent_entry_name == NULL) { 5599 return NULL; 5600 } 5601 if (lib_name != NULL) { 5602 const char *p = strrchr(sym_name, '@'); 5603 if (p != NULL && p != sym_name) { 5604 // sym_name == _Agent_OnLoad@XX 5605 strncpy(agent_entry_name, sym_name, (p - sym_name)); 5606 agent_entry_name[(p-sym_name)] = '\0'; 5607 // agent_entry_name == _Agent_OnLoad 5608 strcat(agent_entry_name, "_"); 5609 strncat(agent_entry_name, lib_name, name_len); 5610 strcat(agent_entry_name, p); 5611 // agent_entry_name == _Agent_OnLoad_lib_name@XX 5612 } else { 5613 strcpy(agent_entry_name, sym_name); 5614 strcat(agent_entry_name, "_"); 5615 strncat(agent_entry_name, lib_name, name_len); 5616 } 5617 } else { 5618 strcpy(agent_entry_name, sym_name); 5619 } 5620 return agent_entry_name; 5621 } 5622 5623 #ifndef PRODUCT 5624 5625 // test the code path in reserve_memory_special() that tries to allocate memory in a single 5626 // contiguous memory block at a particular address. 5627 // The test first tries to find a good approximate address to allocate at by using the same 5628 // method to allocate some memory at any address. The test then tries to allocate memory in 5629 // the vicinity (not directly after it to avoid possible by-chance use of that location) 5630 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of 5631 // the previously allocated memory is available for allocation. The only actual failure 5632 // that is reported is when the test tries to allocate at a particular location but gets a 5633 // different valid one. A NULL return value at this point is not considered an error but may 5634 // be legitimate. 5635 void TestReserveMemorySpecial_test() { 5636 if (!UseLargePages) { 5637 return; 5638 } 5639 // save current value of globals 5640 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; 5641 bool old_use_numa_interleaving = UseNUMAInterleaving; 5642 5643 // set globals to make sure we hit the correct code path 5644 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; 5645 5646 // do an allocation at an address selected by the OS to get a good one. 5647 const size_t large_allocation_size = os::large_page_size() * 4; 5648 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); 5649 if (result == NULL) { 5650 } else { 5651 os::release_memory_special(result, large_allocation_size); 5652 5653 // allocate another page within the recently allocated memory area which seems to be a good location. At least 5654 // we managed to get it once. 5655 const size_t expected_allocation_size = os::large_page_size(); 5656 char* expected_location = result + os::large_page_size(); 5657 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); 5658 if (actual_location == NULL) { 5659 } else { 5660 // release memory 5661 os::release_memory_special(actual_location, expected_allocation_size); 5662 // only now check, after releasing any memory to avoid any leaks. 5663 assert(actual_location == expected_location, 5664 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead", 5665 expected_location, expected_allocation_size, actual_location); 5666 } 5667 } 5668 5669 // restore globals 5670 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; 5671 UseNUMAInterleaving = old_use_numa_interleaving; 5672 } 5673 #endif // PRODUCT 5674 5675 /* 5676 All the defined signal names for Windows. 5677 5678 NOTE that not all of these names are accepted by FindSignal! 5679 5680 For various reasons some of these may be rejected at runtime. 5681 5682 Here are the names currently accepted by a user of sun.misc.Signal with 5683 1.4.1 (ignoring potential interaction with use of chaining, etc): 5684 5685 (LIST TBD) 5686 5687 */ 5688 int os::get_signal_number(const char* name) { 5689 static const struct { 5690 const char* name; 5691 int number; 5692 } siglabels [] = 5693 // derived from version 6.0 VC98/include/signal.h 5694 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl 5695 "FPE", SIGFPE, // floating point exception 5696 "SEGV", SIGSEGV, // segment violation 5697 "INT", SIGINT, // interrupt 5698 "TERM", SIGTERM, // software term signal from kill 5699 "BREAK", SIGBREAK, // Ctrl-Break sequence 5700 "ILL", SIGILL}; // illegal instruction 5701 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) { 5702 if (strcmp(name, siglabels[i].name) == 0) { 5703 return siglabels[i].number; 5704 } 5705 } 5706 return -1; 5707 } 5708 5709 // Fast current thread access 5710 5711 int os::win32::_thread_ptr_offset = 0; 5712 5713 static void call_wrapper_dummy() {} 5714 5715 // We need to call the os_exception_wrapper once so that it sets 5716 // up the offset from FS of the thread pointer. 5717 void os::win32::initialize_thread_ptr_offset() { 5718 os::os_exception_wrapper((java_call_t)call_wrapper_dummy, 5719 NULL, NULL, NULL, NULL); 5720 } 5721 5722 bool os::supports_map_sync() { 5723 return false; 5724 }