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 if (home_path == NULL) { 228 return; 229 } 230 strcpy(home_path, home_dir); 231 Arguments::set_java_home(home_path); 232 FREE_C_HEAP_ARRAY(char, home_path); 233 234 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, 235 mtInternal); 236 if (dll_path == NULL) { 237 return; 238 } 239 strcpy(dll_path, home_dir); 240 strcat(dll_path, bin); 241 Arguments::set_dll_dir(dll_path); 242 FREE_C_HEAP_ARRAY(char, dll_path); 243 244 if (!set_boot_path('\\', ';')) { 245 vm_exit_during_initialization("Failed setting boot class path.", NULL); 246 } 247 } 248 249 // library_path 250 #define EXT_DIR "\\lib\\ext" 251 #define BIN_DIR "\\bin" 252 #define PACKAGE_DIR "\\Sun\\Java" 253 { 254 // Win32 library search order (See the documentation for LoadLibrary): 255 // 256 // 1. The directory from which application is loaded. 257 // 2. The system wide Java Extensions directory (Java only) 258 // 3. System directory (GetSystemDirectory) 259 // 4. Windows directory (GetWindowsDirectory) 260 // 5. The PATH environment variable 261 // 6. The current directory 262 263 char *library_path; 264 char tmp[MAX_PATH]; 265 char *path_str = ::getenv("PATH"); 266 267 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 268 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal); 269 270 library_path[0] = '\0'; 271 272 GetModuleFileName(NULL, tmp, sizeof(tmp)); 273 *(strrchr(tmp, '\\')) = '\0'; 274 strcat(library_path, tmp); 275 276 GetWindowsDirectory(tmp, sizeof(tmp)); 277 strcat(library_path, ";"); 278 strcat(library_path, tmp); 279 strcat(library_path, PACKAGE_DIR BIN_DIR); 280 281 GetSystemDirectory(tmp, sizeof(tmp)); 282 strcat(library_path, ";"); 283 strcat(library_path, tmp); 284 285 GetWindowsDirectory(tmp, sizeof(tmp)); 286 strcat(library_path, ";"); 287 strcat(library_path, tmp); 288 289 if (path_str) { 290 strcat(library_path, ";"); 291 strcat(library_path, path_str); 292 } 293 294 strcat(library_path, ";."); 295 296 Arguments::set_library_path(library_path); 297 FREE_C_HEAP_ARRAY(char, library_path); 298 } 299 300 // Default extensions directory 301 { 302 char path[MAX_PATH]; 303 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 304 GetWindowsDirectory(path, MAX_PATH); 305 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 306 path, PACKAGE_DIR, EXT_DIR); 307 Arguments::set_ext_dirs(buf); 308 } 309 #undef EXT_DIR 310 #undef BIN_DIR 311 #undef PACKAGE_DIR 312 313 #ifndef _WIN64 314 // set our UnhandledExceptionFilter and save any previous one 315 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception); 316 #endif 317 318 // Done 319 return; 320 } 321 322 void os::breakpoint() { 323 DebugBreak(); 324 } 325 326 // Invoked from the BREAKPOINT Macro 327 extern "C" void breakpoint() { 328 os::breakpoint(); 329 } 330 331 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP. 332 // So far, this method is only used by Native Memory Tracking, which is 333 // only supported on Windows XP or later. 334 // 335 int os::get_native_stack(address* stack, int frames, int toSkip) { 336 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL); 337 for (int index = captured; index < frames; index ++) { 338 stack[index] = NULL; 339 } 340 return captured; 341 } 342 343 344 // os::current_stack_base() 345 // 346 // Returns the base of the stack, which is the stack's 347 // starting address. This function must be called 348 // while running on the stack of the thread being queried. 349 350 address os::current_stack_base() { 351 MEMORY_BASIC_INFORMATION minfo; 352 address stack_bottom; 353 size_t stack_size; 354 355 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 356 stack_bottom = (address)minfo.AllocationBase; 357 stack_size = minfo.RegionSize; 358 359 // Add up the sizes of all the regions with the same 360 // AllocationBase. 361 while (1) { 362 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 363 if (stack_bottom == (address)minfo.AllocationBase) { 364 stack_size += minfo.RegionSize; 365 } else { 366 break; 367 } 368 } 369 return stack_bottom + stack_size; 370 } 371 372 size_t os::current_stack_size() { 373 size_t sz; 374 MEMORY_BASIC_INFORMATION minfo; 375 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 376 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 377 return sz; 378 } 379 380 bool os::committed_in_range(address start, size_t size, address& committed_start, size_t& committed_size) { 381 MEMORY_BASIC_INFORMATION minfo; 382 committed_start = NULL; 383 committed_size = 0; 384 address top = start + size; 385 const address start_addr = start; 386 while (start < top) { 387 VirtualQuery(start, &minfo, sizeof(minfo)); 388 if ((minfo.State & MEM_COMMIT) == 0) { // not committed 389 if (committed_start != NULL) { 390 break; 391 } 392 } else { // committed 393 if (committed_start == NULL) { 394 committed_start = start; 395 } 396 size_t offset = start - (address)minfo.BaseAddress; 397 committed_size += minfo.RegionSize - offset; 398 } 399 start = (address)minfo.BaseAddress + minfo.RegionSize; 400 } 401 402 if (committed_start == NULL) { 403 assert(committed_size == 0, "Sanity"); 404 return false; 405 } else { 406 assert(committed_start >= start_addr && committed_start < top, "Out of range"); 407 // current region may go beyond the limit, trim to the limit 408 committed_size = MIN2(committed_size, size_t(top - committed_start)); 409 return true; 410 } 411 } 412 413 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 414 const struct tm* time_struct_ptr = localtime(clock); 415 if (time_struct_ptr != NULL) { 416 *res = *time_struct_ptr; 417 return res; 418 } 419 return NULL; 420 } 421 422 struct tm* os::gmtime_pd(const time_t* clock, struct tm* res) { 423 const struct tm* time_struct_ptr = gmtime(clock); 424 if (time_struct_ptr != NULL) { 425 *res = *time_struct_ptr; 426 return res; 427 } 428 return NULL; 429 } 430 431 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 432 433 // Thread start routine for all newly created threads 434 static unsigned __stdcall thread_native_entry(Thread* thread) { 435 436 thread->record_stack_base_and_size(); 437 438 // Try to randomize the cache line index of hot stack frames. 439 // This helps when threads of the same stack traces evict each other's 440 // cache lines. The threads can be either from the same JVM instance, or 441 // from different JVM instances. The benefit is especially true for 442 // processors with hyperthreading technology. 443 static int counter = 0; 444 int pid = os::current_process_id(); 445 _alloca(((pid ^ counter++) & 7) * 128); 446 447 thread->initialize_thread_current(); 448 449 OSThread* osthr = thread->osthread(); 450 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 451 452 if (UseNUMA) { 453 int lgrp_id = os::numa_get_group_id(); 454 if (lgrp_id != -1) { 455 thread->set_lgrp_id(lgrp_id); 456 } 457 } 458 459 // Diagnostic code to investigate JDK-6573254 460 int res = 30115; // non-java thread 461 if (thread->is_Java_thread()) { 462 res = 20115; // java thread 463 } 464 465 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id()); 466 467 // Install a win32 structured exception handler around every thread created 468 // by VM, so VM can generate error dump when an exception occurred in non- 469 // Java thread (e.g. VM thread). 470 __try { 471 thread->call_run(); 472 } __except(topLevelExceptionFilter( 473 (_EXCEPTION_POINTERS*)_exception_info())) { 474 // Nothing to do. 475 } 476 477 // Note: at this point the thread object may already have deleted itself. 478 // Do not dereference it from here on out. 479 480 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); 481 482 // One less thread is executing 483 // When the VMThread gets here, the main thread may have already exited 484 // which frees the CodeHeap containing the Atomic::add code 485 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 486 Atomic::dec(&os::win32::_os_thread_count); 487 } 488 489 // Thread must not return from exit_process_or_thread(), but if it does, 490 // let it proceed to exit normally 491 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res); 492 } 493 494 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, 495 int thread_id) { 496 // Allocate the OSThread object 497 OSThread* osthread = new OSThread(NULL, NULL); 498 if (osthread == NULL) return NULL; 499 500 // Initialize support for Java interrupts 501 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 502 if (interrupt_event == NULL) { 503 delete osthread; 504 return NULL; 505 } 506 osthread->set_interrupt_event(interrupt_event); 507 508 // Store info on the Win32 thread into the OSThread 509 osthread->set_thread_handle(thread_handle); 510 osthread->set_thread_id(thread_id); 511 512 if (UseNUMA) { 513 int lgrp_id = os::numa_get_group_id(); 514 if (lgrp_id != -1) { 515 thread->set_lgrp_id(lgrp_id); 516 } 517 } 518 519 // Initial thread state is INITIALIZED, not SUSPENDED 520 osthread->set_state(INITIALIZED); 521 522 return osthread; 523 } 524 525 526 bool os::create_attached_thread(JavaThread* thread) { 527 #ifdef ASSERT 528 thread->verify_not_published(); 529 #endif 530 HANDLE thread_h; 531 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 532 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 533 fatal("DuplicateHandle failed\n"); 534 } 535 OSThread* osthread = create_os_thread(thread, thread_h, 536 (int)current_thread_id()); 537 if (osthread == NULL) { 538 return false; 539 } 540 541 // Initial thread state is RUNNABLE 542 osthread->set_state(RUNNABLE); 543 544 thread->set_osthread(osthread); 545 546 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", 547 os::current_thread_id()); 548 549 return true; 550 } 551 552 bool os::create_main_thread(JavaThread* thread) { 553 #ifdef ASSERT 554 thread->verify_not_published(); 555 #endif 556 if (_starting_thread == NULL) { 557 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 558 if (_starting_thread == NULL) { 559 return false; 560 } 561 } 562 563 // The primordial thread is runnable from the start) 564 _starting_thread->set_state(RUNNABLE); 565 566 thread->set_osthread(_starting_thread); 567 return true; 568 } 569 570 // Helper function to trace _beginthreadex attributes, 571 // similar to os::Posix::describe_pthread_attr() 572 static char* describe_beginthreadex_attributes(char* buf, size_t buflen, 573 size_t stacksize, unsigned initflag) { 574 stringStream ss(buf, buflen); 575 if (stacksize == 0) { 576 ss.print("stacksize: default, "); 577 } else { 578 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); 579 } 580 ss.print("flags: "); 581 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " "); 582 #define ALL(X) \ 583 X(CREATE_SUSPENDED) \ 584 X(STACK_SIZE_PARAM_IS_A_RESERVATION) 585 ALL(PRINT_FLAG) 586 #undef ALL 587 #undef PRINT_FLAG 588 return buf; 589 } 590 591 // Allocate and initialize a new OSThread 592 bool os::create_thread(Thread* thread, ThreadType thr_type, 593 size_t stack_size) { 594 unsigned thread_id; 595 596 // Allocate the OSThread object 597 OSThread* osthread = new OSThread(NULL, NULL); 598 if (osthread == NULL) { 599 return false; 600 } 601 602 // Initialize support for Java interrupts 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 osthread->set_interrupted(false); 610 611 thread->set_osthread(osthread); 612 613 if (stack_size == 0) { 614 switch (thr_type) { 615 case os::java_thread: 616 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 617 if (JavaThread::stack_size_at_create() > 0) { 618 stack_size = JavaThread::stack_size_at_create(); 619 } 620 break; 621 case os::compiler_thread: 622 if (CompilerThreadStackSize > 0) { 623 stack_size = (size_t)(CompilerThreadStackSize * K); 624 break; 625 } // else fall through: 626 // use VMThreadStackSize if CompilerThreadStackSize is not defined 627 case os::vm_thread: 628 case os::pgc_thread: 629 case os::cgc_thread: 630 case os::watcher_thread: 631 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 632 break; 633 } 634 } 635 636 // Create the Win32 thread 637 // 638 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 639 // does not specify stack size. Instead, it specifies the size of 640 // initially committed space. The stack size is determined by 641 // PE header in the executable. If the committed "stack_size" is larger 642 // than default value in the PE header, the stack is rounded up to the 643 // nearest multiple of 1MB. For example if the launcher has default 644 // stack size of 320k, specifying any size less than 320k does not 645 // affect the actual stack size at all, it only affects the initial 646 // commitment. On the other hand, specifying 'stack_size' larger than 647 // default value may cause significant increase in memory usage, because 648 // not only the stack space will be rounded up to MB, but also the 649 // entire space is committed upfront. 650 // 651 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 652 // for CreateThread() that can treat 'stack_size' as stack size. However we 653 // are not supposed to call CreateThread() directly according to MSDN 654 // document because JVM uses C runtime library. The good news is that the 655 // flag appears to work with _beginthredex() as well. 656 657 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION; 658 HANDLE thread_handle = 659 (HANDLE)_beginthreadex(NULL, 660 (unsigned)stack_size, 661 (unsigned (__stdcall *)(void*)) thread_native_entry, 662 thread, 663 initflag, 664 &thread_id); 665 666 char buf[64]; 667 if (thread_handle != NULL) { 668 log_info(os, thread)("Thread started (tid: %u, attributes: %s)", 669 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag)); 670 } else { 671 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.", 672 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag)); 673 // Log some OS information which might explain why creating the thread failed. 674 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads()); 675 LogStream st(Log(os, thread)::info()); 676 os::print_memory_info(&st); 677 } 678 679 if (thread_handle == NULL) { 680 // Need to clean up stuff we've allocated so far 681 CloseHandle(osthread->interrupt_event()); 682 thread->set_osthread(NULL); 683 delete osthread; 684 return false; 685 } 686 687 Atomic::inc(&os::win32::_os_thread_count); 688 689 // Store info on the Win32 thread into the OSThread 690 osthread->set_thread_handle(thread_handle); 691 osthread->set_thread_id(thread_id); 692 693 // Initial thread state is INITIALIZED, not SUSPENDED 694 osthread->set_state(INITIALIZED); 695 696 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 697 return true; 698 } 699 700 701 // Free Win32 resources related to the OSThread 702 void os::free_thread(OSThread* osthread) { 703 assert(osthread != NULL, "osthread not set"); 704 705 // We are told to free resources of the argument thread, 706 // but we can only really operate on the current thread. 707 assert(Thread::current()->osthread() == osthread, 708 "os::free_thread but not current thread"); 709 710 CloseHandle(osthread->thread_handle()); 711 CloseHandle(osthread->interrupt_event()); 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 void * result = LoadLibrary(name); 1369 if (result != NULL) { 1370 Events::log(NULL, "Loaded shared library %s", name); 1371 // Recalculate pdb search path if a DLL was loaded successfully. 1372 SymbolEngine::recalc_search_path(); 1373 return result; 1374 } 1375 DWORD errcode = GetLastError(); 1376 // Read system error message into ebuf 1377 // It may or may not be overwritten below (in the for loop and just above) 1378 lasterror(ebuf, (size_t) ebuflen); 1379 ebuf[ebuflen - 1] = '\0'; 1380 Events::log(NULL, "Loading shared library %s failed, error code %lu", name, errcode); 1381 1382 if (errcode == ERROR_MOD_NOT_FOUND) { 1383 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1); 1384 ebuf[ebuflen - 1] = '\0'; 1385 return NULL; 1386 } 1387 1388 // Parsing dll below 1389 // If we can read dll-info and find that dll was built 1390 // for an architecture other than Hotspot is running in 1391 // - then print to buffer "DLL was built for a different architecture" 1392 // else call os::lasterror to obtain system error message 1393 int fd = ::open(name, O_RDONLY | O_BINARY, 0); 1394 if (fd < 0) { 1395 return NULL; 1396 } 1397 1398 uint32_t signature_offset; 1399 uint16_t lib_arch = 0; 1400 bool failed_to_get_lib_arch = 1401 ( // Go to position 3c in the dll 1402 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0) 1403 || 1404 // Read location of signature 1405 (sizeof(signature_offset) != 1406 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset)))) 1407 || 1408 // Go to COFF File Header in dll 1409 // that is located after "signature" (4 bytes long) 1410 (os::seek_to_file_offset(fd, 1411 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0) 1412 || 1413 // Read field that contains code of architecture 1414 // that dll was built for 1415 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch)))) 1416 ); 1417 1418 ::close(fd); 1419 if (failed_to_get_lib_arch) { 1420 // file i/o error - report os::lasterror(...) msg 1421 return NULL; 1422 } 1423 1424 typedef struct { 1425 uint16_t arch_code; 1426 char* arch_name; 1427 } arch_t; 1428 1429 static const arch_t arch_array[] = { 1430 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1431 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"} 1432 }; 1433 #if (defined _M_AMD64) 1434 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64; 1435 #elif (defined _M_IX86) 1436 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386; 1437 #else 1438 #error Method os::dll_load requires that one of following \ 1439 is defined :_M_AMD64 or _M_IX86 1440 #endif 1441 1442 1443 // Obtain a string for printf operation 1444 // lib_arch_str shall contain string what platform this .dll was built for 1445 // running_arch_str shall string contain what platform Hotspot was built for 1446 char *running_arch_str = NULL, *lib_arch_str = NULL; 1447 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) { 1448 if (lib_arch == arch_array[i].arch_code) { 1449 lib_arch_str = arch_array[i].arch_name; 1450 } 1451 if (running_arch == arch_array[i].arch_code) { 1452 running_arch_str = arch_array[i].arch_name; 1453 } 1454 } 1455 1456 assert(running_arch_str, 1457 "Didn't find running architecture code in arch_array"); 1458 1459 // If the architecture is right 1460 // but some other error took place - report os::lasterror(...) msg 1461 if (lib_arch == running_arch) { 1462 return NULL; 1463 } 1464 1465 if (lib_arch_str != NULL) { 1466 ::_snprintf(ebuf, ebuflen - 1, 1467 "Can't load %s-bit .dll on a %s-bit platform", 1468 lib_arch_str, running_arch_str); 1469 } else { 1470 // don't know what architecture this dll was build for 1471 ::_snprintf(ebuf, ebuflen - 1, 1472 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1473 lib_arch, running_arch_str); 1474 } 1475 1476 return NULL; 1477 } 1478 1479 void os::print_dll_info(outputStream *st) { 1480 st->print_cr("Dynamic libraries:"); 1481 get_loaded_modules_info(_print_module, (void *)st); 1482 } 1483 1484 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1485 HANDLE hProcess; 1486 1487 # define MAX_NUM_MODULES 128 1488 HMODULE modules[MAX_NUM_MODULES]; 1489 static char filename[MAX_PATH]; 1490 int result = 0; 1491 1492 int pid = os::current_process_id(); 1493 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1494 FALSE, pid); 1495 if (hProcess == NULL) return 0; 1496 1497 DWORD size_needed; 1498 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) { 1499 CloseHandle(hProcess); 1500 return 0; 1501 } 1502 1503 // number of modules that are currently loaded 1504 int num_modules = size_needed / sizeof(HMODULE); 1505 1506 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1507 // Get Full pathname: 1508 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) { 1509 filename[0] = '\0'; 1510 } 1511 1512 MODULEINFO modinfo; 1513 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) { 1514 modinfo.lpBaseOfDll = NULL; 1515 modinfo.SizeOfImage = 0; 1516 } 1517 1518 // Invoke callback function 1519 result = callback(filename, (address)modinfo.lpBaseOfDll, 1520 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param); 1521 if (result) break; 1522 } 1523 1524 CloseHandle(hProcess); 1525 return result; 1526 } 1527 1528 bool os::get_host_name(char* buf, size_t buflen) { 1529 DWORD size = (DWORD)buflen; 1530 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE); 1531 } 1532 1533 void os::get_summary_os_info(char* buf, size_t buflen) { 1534 stringStream sst(buf, buflen); 1535 os::win32::print_windows_version(&sst); 1536 // chop off newline character 1537 char* nl = strchr(buf, '\n'); 1538 if (nl != NULL) *nl = '\0'; 1539 } 1540 1541 int os::vsnprintf(char* buf, size_t len, const char* fmt, va_list args) { 1542 #if _MSC_VER >= 1900 1543 // Starting with Visual Studio 2015, vsnprint is C99 compliant. 1544 int result = ::vsnprintf(buf, len, fmt, args); 1545 // If an encoding error occurred (result < 0) then it's not clear 1546 // whether the buffer is NUL terminated, so ensure it is. 1547 if ((result < 0) && (len > 0)) { 1548 buf[len - 1] = '\0'; 1549 } 1550 return result; 1551 #else 1552 // Before Visual Studio 2015, vsnprintf is not C99 compliant, so use 1553 // _vsnprintf, whose behavior seems to be *mostly* consistent across 1554 // versions. However, when len == 0, avoid _vsnprintf too, and just 1555 // go straight to _vscprintf. The output is going to be truncated in 1556 // that case, except in the unusual case of empty output. More 1557 // importantly, the documentation for various versions of Visual Studio 1558 // are inconsistent about the behavior of _vsnprintf when len == 0, 1559 // including it possibly being an error. 1560 int result = -1; 1561 if (len > 0) { 1562 result = _vsnprintf(buf, len, fmt, args); 1563 // If output (including NUL terminator) is truncated, the buffer 1564 // won't be NUL terminated. Add the trailing NUL specified by C99. 1565 if ((result < 0) || ((size_t)result >= len)) { 1566 buf[len - 1] = '\0'; 1567 } 1568 } 1569 if (result < 0) { 1570 result = _vscprintf(fmt, args); 1571 } 1572 return result; 1573 #endif // _MSC_VER dispatch 1574 } 1575 1576 static inline time_t get_mtime(const char* filename) { 1577 struct stat st; 1578 int ret = os::stat(filename, &st); 1579 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno)); 1580 return st.st_mtime; 1581 } 1582 1583 int os::compare_file_modified_times(const char* file1, const char* file2) { 1584 time_t t1 = get_mtime(file1); 1585 time_t t2 = get_mtime(file2); 1586 return t1 - t2; 1587 } 1588 1589 void os::print_os_info_brief(outputStream* st) { 1590 os::print_os_info(st); 1591 } 1592 1593 void os::print_os_info(outputStream* st) { 1594 #ifdef ASSERT 1595 char buffer[1024]; 1596 st->print("HostName: "); 1597 if (get_host_name(buffer, sizeof(buffer))) { 1598 st->print("%s ", buffer); 1599 } else { 1600 st->print("N/A "); 1601 } 1602 #endif 1603 st->print("OS:"); 1604 os::win32::print_windows_version(st); 1605 1606 #ifdef _LP64 1607 VM_Version::print_platform_virtualization_info(st); 1608 #endif 1609 } 1610 1611 void os::win32::print_windows_version(outputStream* st) { 1612 OSVERSIONINFOEX osvi; 1613 VS_FIXEDFILEINFO *file_info; 1614 TCHAR kernel32_path[MAX_PATH]; 1615 UINT len, ret; 1616 1617 // Use the GetVersionEx information to see if we're on a server or 1618 // workstation edition of Windows. Starting with Windows 8.1 we can't 1619 // trust the OS version information returned by this API. 1620 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1621 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1622 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1623 st->print_cr("Call to GetVersionEx failed"); 1624 return; 1625 } 1626 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION); 1627 1628 // Get the full path to \Windows\System32\kernel32.dll and use that for 1629 // determining what version of Windows we're running on. 1630 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1; 1631 ret = GetSystemDirectory(kernel32_path, len); 1632 if (ret == 0 || ret > len) { 1633 st->print_cr("Call to GetSystemDirectory failed"); 1634 return; 1635 } 1636 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret); 1637 1638 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL); 1639 if (version_size == 0) { 1640 st->print_cr("Call to GetFileVersionInfoSize failed"); 1641 return; 1642 } 1643 1644 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal); 1645 if (version_info == NULL) { 1646 st->print_cr("Failed to allocate version_info"); 1647 return; 1648 } 1649 1650 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) { 1651 os::free(version_info); 1652 st->print_cr("Call to GetFileVersionInfo failed"); 1653 return; 1654 } 1655 1656 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) { 1657 os::free(version_info); 1658 st->print_cr("Call to VerQueryValue failed"); 1659 return; 1660 } 1661 1662 int major_version = HIWORD(file_info->dwProductVersionMS); 1663 int minor_version = LOWORD(file_info->dwProductVersionMS); 1664 int build_number = HIWORD(file_info->dwProductVersionLS); 1665 int build_minor = LOWORD(file_info->dwProductVersionLS); 1666 int os_vers = major_version * 1000 + minor_version; 1667 os::free(version_info); 1668 1669 st->print(" Windows "); 1670 switch (os_vers) { 1671 1672 case 6000: 1673 if (is_workstation) { 1674 st->print("Vista"); 1675 } else { 1676 st->print("Server 2008"); 1677 } 1678 break; 1679 1680 case 6001: 1681 if (is_workstation) { 1682 st->print("7"); 1683 } else { 1684 st->print("Server 2008 R2"); 1685 } 1686 break; 1687 1688 case 6002: 1689 if (is_workstation) { 1690 st->print("8"); 1691 } else { 1692 st->print("Server 2012"); 1693 } 1694 break; 1695 1696 case 6003: 1697 if (is_workstation) { 1698 st->print("8.1"); 1699 } else { 1700 st->print("Server 2012 R2"); 1701 } 1702 break; 1703 1704 case 10000: 1705 if (is_workstation) { 1706 st->print("10"); 1707 } else { 1708 // distinguish Windows Server 2016 and 2019 by build number 1709 // Windows server 2019 GA 10/2018 build number is 17763 1710 if (build_number > 17762) { 1711 st->print("Server 2019"); 1712 } else { 1713 st->print("Server 2016"); 1714 } 1715 } 1716 break; 1717 1718 default: 1719 // Unrecognized windows, print out its major and minor versions 1720 st->print("%d.%d", major_version, minor_version); 1721 break; 1722 } 1723 1724 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1725 // find out whether we are running on 64 bit processor or not 1726 SYSTEM_INFO si; 1727 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1728 GetNativeSystemInfo(&si); 1729 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1730 st->print(" , 64 bit"); 1731 } 1732 1733 st->print(" Build %d", build_number); 1734 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor); 1735 st->cr(); 1736 } 1737 1738 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1739 // Nothing to do for now. 1740 } 1741 1742 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1743 HKEY key; 1744 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE, 1745 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key); 1746 if (status == ERROR_SUCCESS) { 1747 DWORD size = (DWORD)buflen; 1748 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size); 1749 if (status != ERROR_SUCCESS) { 1750 strncpy(buf, "## __CPU__", buflen); 1751 } 1752 RegCloseKey(key); 1753 } else { 1754 // Put generic cpu info to return 1755 strncpy(buf, "## __CPU__", buflen); 1756 } 1757 } 1758 1759 void os::print_memory_info(outputStream* st) { 1760 st->print("Memory:"); 1761 st->print(" %dk page", os::vm_page_size()>>10); 1762 1763 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1764 // value if total memory is larger than 4GB 1765 MEMORYSTATUSEX ms; 1766 ms.dwLength = sizeof(ms); 1767 int r1 = GlobalMemoryStatusEx(&ms); 1768 1769 if (r1 != 0) { 1770 st->print(", system-wide physical " INT64_FORMAT "M ", 1771 (int64_t) ms.ullTotalPhys >> 20); 1772 st->print("(" INT64_FORMAT "M free)\n", (int64_t) ms.ullAvailPhys >> 20); 1773 1774 st->print("TotalPageFile size " INT64_FORMAT "M ", 1775 (int64_t) ms.ullTotalPageFile >> 20); 1776 st->print("(AvailPageFile size " INT64_FORMAT "M)", 1777 (int64_t) ms.ullAvailPageFile >> 20); 1778 1779 // on 32bit Total/AvailVirtual are interesting (show us how close we get to 2-4 GB per process borders) 1780 #if defined(_M_IX86) 1781 st->print(", user-mode portion of virtual address-space " INT64_FORMAT "M ", 1782 (int64_t) ms.ullTotalVirtual >> 20); 1783 st->print("(" INT64_FORMAT "M free)", (int64_t) ms.ullAvailVirtual >> 20); 1784 #endif 1785 } else { 1786 st->print(", GlobalMemoryStatusEx did not succeed so we miss some memory values."); 1787 } 1788 1789 // extended memory statistics for a process 1790 PROCESS_MEMORY_COUNTERS_EX pmex; 1791 ZeroMemory(&pmex, sizeof(PROCESS_MEMORY_COUNTERS_EX)); 1792 pmex.cb = sizeof(pmex); 1793 int r2 = GetProcessMemoryInfo(GetCurrentProcess(), (PROCESS_MEMORY_COUNTERS*) &pmex, sizeof(pmex)); 1794 1795 if (r2 != 0) { 1796 st->print("\ncurrent process WorkingSet (physical memory assigned to process): " INT64_FORMAT "M, ", 1797 (int64_t) pmex.WorkingSetSize >> 20); 1798 st->print("peak: " INT64_FORMAT "M\n", (int64_t) pmex.PeakWorkingSetSize >> 20); 1799 1800 st->print("current process commit charge (\"private bytes\"): " INT64_FORMAT "M, ", 1801 (int64_t) pmex.PrivateUsage >> 20); 1802 st->print("peak: " INT64_FORMAT "M", (int64_t) pmex.PeakPagefileUsage >> 20); 1803 } else { 1804 st->print("\nGetProcessMemoryInfo did not succeed so we miss some memory values."); 1805 } 1806 1807 st->cr(); 1808 } 1809 1810 bool os::signal_sent_by_kill(const void* siginfo) { 1811 // TODO: Is this possible? 1812 return false; 1813 } 1814 1815 void os::print_siginfo(outputStream *st, const void* siginfo) { 1816 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo; 1817 st->print("siginfo:"); 1818 1819 char tmp[64]; 1820 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) { 1821 strcpy(tmp, "EXCEPTION_??"); 1822 } 1823 st->print(" %s (0x%x)", tmp, er->ExceptionCode); 1824 1825 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION || 1826 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) && 1827 er->NumberParameters >= 2) { 1828 switch (er->ExceptionInformation[0]) { 1829 case 0: st->print(", reading address"); break; 1830 case 1: st->print(", writing address"); break; 1831 case 8: st->print(", data execution prevention violation at address"); break; 1832 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1833 er->ExceptionInformation[0]); 1834 } 1835 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1836 } else { 1837 int num = er->NumberParameters; 1838 if (num > 0) { 1839 st->print(", ExceptionInformation="); 1840 for (int i = 0; i < num; i++) { 1841 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1842 } 1843 } 1844 } 1845 st->cr(); 1846 } 1847 1848 bool os::signal_thread(Thread* thread, int sig, const char* reason) { 1849 // TODO: Can we kill thread? 1850 return false; 1851 } 1852 1853 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1854 // do nothing 1855 } 1856 1857 static char saved_jvm_path[MAX_PATH] = {0}; 1858 1859 // Find the full path to the current module, jvm.dll 1860 void os::jvm_path(char *buf, jint buflen) { 1861 // Error checking. 1862 if (buflen < MAX_PATH) { 1863 assert(false, "must use a large-enough buffer"); 1864 buf[0] = '\0'; 1865 return; 1866 } 1867 // Lazy resolve the path to current module. 1868 if (saved_jvm_path[0] != 0) { 1869 strcpy(buf, saved_jvm_path); 1870 return; 1871 } 1872 1873 buf[0] = '\0'; 1874 if (Arguments::sun_java_launcher_is_altjvm()) { 1875 // Support for the java launcher's '-XXaltjvm=<path>' option. Check 1876 // for a JAVA_HOME environment variable and fix up the path so it 1877 // looks like jvm.dll is installed there (append a fake suffix 1878 // hotspot/jvm.dll). 1879 char* java_home_var = ::getenv("JAVA_HOME"); 1880 if (java_home_var != NULL && java_home_var[0] != 0 && 1881 strlen(java_home_var) < (size_t)buflen) { 1882 strncpy(buf, java_home_var, buflen); 1883 1884 // determine if this is a legacy image or modules image 1885 // modules image doesn't have "jre" subdirectory 1886 size_t len = strlen(buf); 1887 char* jrebin_p = buf + len; 1888 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1889 if (0 != _access(buf, 0)) { 1890 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1891 } 1892 len = strlen(buf); 1893 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1894 } 1895 } 1896 1897 if (buf[0] == '\0') { 1898 GetModuleFileName(vm_lib_handle, buf, buflen); 1899 } 1900 strncpy(saved_jvm_path, buf, MAX_PATH); 1901 saved_jvm_path[MAX_PATH - 1] = '\0'; 1902 } 1903 1904 1905 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1906 #ifndef _WIN64 1907 st->print("_"); 1908 #endif 1909 } 1910 1911 1912 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1913 #ifndef _WIN64 1914 st->print("@%d", args_size * sizeof(int)); 1915 #endif 1916 } 1917 1918 // This method is a copy of JDK's sysGetLastErrorString 1919 // from src/windows/hpi/src/system_md.c 1920 1921 size_t os::lasterror(char* buf, size_t len) { 1922 DWORD errval; 1923 1924 if ((errval = GetLastError()) != 0) { 1925 // DOS error 1926 size_t n = (size_t)FormatMessage( 1927 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1928 NULL, 1929 errval, 1930 0, 1931 buf, 1932 (DWORD)len, 1933 NULL); 1934 if (n > 3) { 1935 // Drop final '.', CR, LF 1936 if (buf[n - 1] == '\n') n--; 1937 if (buf[n - 1] == '\r') n--; 1938 if (buf[n - 1] == '.') n--; 1939 buf[n] = '\0'; 1940 } 1941 return n; 1942 } 1943 1944 if (errno != 0) { 1945 // C runtime error that has no corresponding DOS error code 1946 const char* s = os::strerror(errno); 1947 size_t n = strlen(s); 1948 if (n >= len) n = len - 1; 1949 strncpy(buf, s, n); 1950 buf[n] = '\0'; 1951 return n; 1952 } 1953 1954 return 0; 1955 } 1956 1957 int os::get_last_error() { 1958 DWORD error = GetLastError(); 1959 if (error == 0) { 1960 error = errno; 1961 } 1962 return (int)error; 1963 } 1964 1965 // sun.misc.Signal 1966 // NOTE that this is a workaround for an apparent kernel bug where if 1967 // a signal handler for SIGBREAK is installed then that signal handler 1968 // takes priority over the console control handler for CTRL_CLOSE_EVENT. 1969 // See bug 4416763. 1970 static void (*sigbreakHandler)(int) = NULL; 1971 1972 static void UserHandler(int sig, void *siginfo, void *context) { 1973 os::signal_notify(sig); 1974 // We need to reinstate the signal handler each time... 1975 os::signal(sig, (void*)UserHandler); 1976 } 1977 1978 void* os::user_handler() { 1979 return (void*) UserHandler; 1980 } 1981 1982 void* os::signal(int signal_number, void* handler) { 1983 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1984 void (*oldHandler)(int) = sigbreakHandler; 1985 sigbreakHandler = (void (*)(int)) handler; 1986 return (void*) oldHandler; 1987 } else { 1988 return (void*)::signal(signal_number, (void (*)(int))handler); 1989 } 1990 } 1991 1992 void os::signal_raise(int signal_number) { 1993 raise(signal_number); 1994 } 1995 1996 // The Win32 C runtime library maps all console control events other than ^C 1997 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1998 // logoff, and shutdown events. We therefore install our own console handler 1999 // that raises SIGTERM for the latter cases. 2000 // 2001 static BOOL WINAPI consoleHandler(DWORD event) { 2002 switch (event) { 2003 case CTRL_C_EVENT: 2004 if (VMError::is_error_reported()) { 2005 // Ctrl-C is pressed during error reporting, likely because the error 2006 // handler fails to abort. Let VM die immediately. 2007 os::die(); 2008 } 2009 2010 os::signal_raise(SIGINT); 2011 return TRUE; 2012 break; 2013 case CTRL_BREAK_EVENT: 2014 if (sigbreakHandler != NULL) { 2015 (*sigbreakHandler)(SIGBREAK); 2016 } 2017 return TRUE; 2018 break; 2019 case CTRL_LOGOFF_EVENT: { 2020 // Don't terminate JVM if it is running in a non-interactive session, 2021 // such as a service process. 2022 USEROBJECTFLAGS flags; 2023 HANDLE handle = GetProcessWindowStation(); 2024 if (handle != NULL && 2025 GetUserObjectInformation(handle, UOI_FLAGS, &flags, 2026 sizeof(USEROBJECTFLAGS), NULL)) { 2027 // If it is a non-interactive session, let next handler to deal 2028 // with it. 2029 if ((flags.dwFlags & WSF_VISIBLE) == 0) { 2030 return FALSE; 2031 } 2032 } 2033 } 2034 case CTRL_CLOSE_EVENT: 2035 case CTRL_SHUTDOWN_EVENT: 2036 os::signal_raise(SIGTERM); 2037 return TRUE; 2038 break; 2039 default: 2040 break; 2041 } 2042 return FALSE; 2043 } 2044 2045 // The following code is moved from os.cpp for making this 2046 // code platform specific, which it is by its very nature. 2047 2048 // Return maximum OS signal used + 1 for internal use only 2049 // Used as exit signal for signal_thread 2050 int os::sigexitnum_pd() { 2051 return NSIG; 2052 } 2053 2054 // a counter for each possible signal value, including signal_thread exit signal 2055 static volatile jint pending_signals[NSIG+1] = { 0 }; 2056 static Semaphore* sig_sem = NULL; 2057 2058 static void jdk_misc_signal_init() { 2059 // Initialize signal structures 2060 memset((void*)pending_signals, 0, sizeof(pending_signals)); 2061 2062 // Initialize signal semaphore 2063 sig_sem = new Semaphore(); 2064 2065 // Programs embedding the VM do not want it to attempt to receive 2066 // events like CTRL_LOGOFF_EVENT, which are used to implement the 2067 // shutdown hooks mechanism introduced in 1.3. For example, when 2068 // the VM is run as part of a Windows NT service (i.e., a servlet 2069 // engine in a web server), the correct behavior is for any console 2070 // control handler to return FALSE, not TRUE, because the OS's 2071 // "final" handler for such events allows the process to continue if 2072 // it is a service (while terminating it if it is not a service). 2073 // To make this behavior uniform and the mechanism simpler, we 2074 // completely disable the VM's usage of these console events if -Xrs 2075 // (=ReduceSignalUsage) is specified. This means, for example, that 2076 // the CTRL-BREAK thread dump mechanism is also disabled in this 2077 // case. See bugs 4323062, 4345157, and related bugs. 2078 2079 // Add a CTRL-C handler 2080 SetConsoleCtrlHandler(consoleHandler, TRUE); 2081 } 2082 2083 void os::signal_notify(int sig) { 2084 if (sig_sem != NULL) { 2085 Atomic::inc(&pending_signals[sig]); 2086 sig_sem->signal(); 2087 } else { 2088 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init 2089 // initialization isn't called. 2090 assert(ReduceSignalUsage, "signal semaphore should be created"); 2091 } 2092 } 2093 2094 static int check_pending_signals() { 2095 while (true) { 2096 for (int i = 0; i < NSIG + 1; i++) { 2097 jint n = pending_signals[i]; 2098 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2099 return i; 2100 } 2101 } 2102 JavaThread *thread = JavaThread::current(); 2103 2104 ThreadBlockInVM tbivm(thread); 2105 2106 bool threadIsSuspended; 2107 do { 2108 thread->set_suspend_equivalent(); 2109 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2110 sig_sem->wait(); 2111 2112 // were we externally suspended while we were waiting? 2113 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2114 if (threadIsSuspended) { 2115 // The semaphore has been incremented, but while we were waiting 2116 // another thread suspended us. We don't want to continue running 2117 // while suspended because that would surprise the thread that 2118 // suspended us. 2119 sig_sem->signal(); 2120 2121 thread->java_suspend_self(); 2122 } 2123 } while (threadIsSuspended); 2124 } 2125 } 2126 2127 int os::signal_wait() { 2128 return check_pending_signals(); 2129 } 2130 2131 // Implicit OS exception handling 2132 2133 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, 2134 address handler) { 2135 JavaThread* thread = (JavaThread*) Thread::current_or_null(); 2136 // Save pc in thread 2137 #ifdef _M_AMD64 2138 // Do not blow up if no thread info available. 2139 if (thread) { 2140 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip); 2141 } 2142 // Set pc to handler 2143 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 2144 #else 2145 // Do not blow up if no thread info available. 2146 if (thread) { 2147 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip); 2148 } 2149 // Set pc to handler 2150 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler; 2151 #endif 2152 2153 // Continue the execution 2154 return EXCEPTION_CONTINUE_EXECUTION; 2155 } 2156 2157 2158 // Used for PostMortemDump 2159 extern "C" void safepoints(); 2160 extern "C" void find(int x); 2161 extern "C" void events(); 2162 2163 // According to Windows API documentation, an illegal instruction sequence should generate 2164 // the 0xC000001C exception code. However, real world experience shows that occasionnaly 2165 // the execution of an illegal instruction can generate the exception code 0xC000001E. This 2166 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 2167 2168 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 2169 2170 // From "Execution Protection in the Windows Operating System" draft 0.35 2171 // Once a system header becomes available, the "real" define should be 2172 // included or copied here. 2173 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2174 2175 // Windows Vista/2008 heap corruption check 2176 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374 2177 2178 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual 2179 // C++ compiler contain this error code. Because this is a compiler-generated 2180 // error, the code is not listed in the Win32 API header files. 2181 // The code is actually a cryptic mnemonic device, with the initial "E" 2182 // standing for "exception" and the final 3 bytes (0x6D7363) representing the 2183 // ASCII values of "msc". 2184 2185 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363 2186 2187 #define def_excpt(val) { #val, (val) } 2188 2189 static const struct { const char* name; uint number; } exceptlabels[] = { 2190 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2191 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2192 def_excpt(EXCEPTION_BREAKPOINT), 2193 def_excpt(EXCEPTION_SINGLE_STEP), 2194 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2195 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2196 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2197 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2198 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2199 def_excpt(EXCEPTION_FLT_OVERFLOW), 2200 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2201 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2202 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2203 def_excpt(EXCEPTION_INT_OVERFLOW), 2204 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2205 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2206 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2207 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2208 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2209 def_excpt(EXCEPTION_STACK_OVERFLOW), 2210 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2211 def_excpt(EXCEPTION_GUARD_PAGE), 2212 def_excpt(EXCEPTION_INVALID_HANDLE), 2213 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION), 2214 def_excpt(EXCEPTION_HEAP_CORRUPTION) 2215 }; 2216 2217 #undef def_excpt 2218 2219 const char* os::exception_name(int exception_code, char *buf, size_t size) { 2220 uint code = static_cast<uint>(exception_code); 2221 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) { 2222 if (exceptlabels[i].number == code) { 2223 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2224 return buf; 2225 } 2226 } 2227 2228 return NULL; 2229 } 2230 2231 //----------------------------------------------------------------------------- 2232 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2233 // handle exception caused by idiv; should only happen for -MinInt/-1 2234 // (division by zero is handled explicitly) 2235 #ifdef _M_AMD64 2236 PCONTEXT ctx = exceptionInfo->ContextRecord; 2237 address pc = (address)ctx->Rip; 2238 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode"); 2239 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2240 if (pc[0] == 0xF7) { 2241 // set correct result values and continue after idiv instruction 2242 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes 2243 } else { 2244 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes 2245 } 2246 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation) 2247 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the 2248 // idiv opcode (0xF7). 2249 ctx->Rdx = (DWORD)0; // remainder 2250 // Continue the execution 2251 #else 2252 PCONTEXT ctx = exceptionInfo->ContextRecord; 2253 address pc = (address)ctx->Eip; 2254 assert(pc[0] == 0xF7, "not an idiv opcode"); 2255 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2256 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2257 // set correct result values and continue after idiv instruction 2258 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2259 ctx->Eax = (DWORD)min_jint; // result 2260 ctx->Edx = (DWORD)0; // remainder 2261 // Continue the execution 2262 #endif 2263 return EXCEPTION_CONTINUE_EXECUTION; 2264 } 2265 2266 //----------------------------------------------------------------------------- 2267 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2268 PCONTEXT ctx = exceptionInfo->ContextRecord; 2269 #ifndef _WIN64 2270 // handle exception caused by native method modifying control word 2271 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2272 2273 switch (exception_code) { 2274 case EXCEPTION_FLT_DENORMAL_OPERAND: 2275 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2276 case EXCEPTION_FLT_INEXACT_RESULT: 2277 case EXCEPTION_FLT_INVALID_OPERATION: 2278 case EXCEPTION_FLT_OVERFLOW: 2279 case EXCEPTION_FLT_STACK_CHECK: 2280 case EXCEPTION_FLT_UNDERFLOW: 2281 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2282 if (fp_control_word != ctx->FloatSave.ControlWord) { 2283 // Restore FPCW and mask out FLT exceptions 2284 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2285 // Mask out pending FLT exceptions 2286 ctx->FloatSave.StatusWord &= 0xffffff00; 2287 return EXCEPTION_CONTINUE_EXECUTION; 2288 } 2289 } 2290 2291 if (prev_uef_handler != NULL) { 2292 // We didn't handle this exception so pass it to the previous 2293 // UnhandledExceptionFilter. 2294 return (prev_uef_handler)(exceptionInfo); 2295 } 2296 #else // !_WIN64 2297 // On Windows, the mxcsr control bits are non-volatile across calls 2298 // See also CR 6192333 2299 // 2300 jint MxCsr = INITIAL_MXCSR; 2301 // we can't use StubRoutines::addr_mxcsr_std() 2302 // because in Win64 mxcsr is not saved there 2303 if (MxCsr != ctx->MxCsr) { 2304 ctx->MxCsr = MxCsr; 2305 return EXCEPTION_CONTINUE_EXECUTION; 2306 } 2307 #endif // !_WIN64 2308 2309 return EXCEPTION_CONTINUE_SEARCH; 2310 } 2311 2312 static inline void report_error(Thread* t, DWORD exception_code, 2313 address addr, void* siginfo, void* context) { 2314 VMError::report_and_die(t, exception_code, addr, siginfo, context); 2315 2316 // If UseOsErrorReporting, this will return here and save the error file 2317 // somewhere where we can find it in the minidump. 2318 } 2319 2320 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread, 2321 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) { 2322 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2323 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2324 if (Interpreter::contains(pc)) { 2325 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord); 2326 if (!fr->is_first_java_frame()) { 2327 // get_frame_at_stack_banging_point() is only called when we 2328 // have well defined stacks so java_sender() calls do not need 2329 // to assert safe_for_sender() first. 2330 *fr = fr->java_sender(); 2331 } 2332 } else { 2333 // more complex code with compiled code 2334 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above"); 2335 CodeBlob* cb = CodeCache::find_blob(pc); 2336 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) { 2337 // Not sure where the pc points to, fallback to default 2338 // stack overflow handling 2339 return false; 2340 } else { 2341 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord); 2342 // in compiled code, the stack banging is performed just after the return pc 2343 // has been pushed on the stack 2344 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp())); 2345 if (!fr->is_java_frame()) { 2346 // See java_sender() comment above. 2347 *fr = fr->java_sender(); 2348 } 2349 } 2350 } 2351 assert(fr->is_java_frame(), "Safety check"); 2352 return true; 2353 } 2354 2355 #if INCLUDE_AOT 2356 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2357 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2358 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2359 address pc = (address) exceptionInfo->ContextRecord->Rip; 2360 2361 // Handle the case where we get an implicit exception in AOT generated 2362 // code. AOT DLL's loaded are not registered for structured exceptions. 2363 // If the exception occurred in the codeCache or AOT code, pass control 2364 // to our normal exception handler. 2365 CodeBlob* cb = CodeCache::find_blob(pc); 2366 if (cb != NULL) { 2367 return topLevelExceptionFilter(exceptionInfo); 2368 } 2369 2370 return EXCEPTION_CONTINUE_SEARCH; 2371 } 2372 #endif 2373 2374 //----------------------------------------------------------------------------- 2375 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2376 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2377 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2378 #ifdef _M_AMD64 2379 address pc = (address) exceptionInfo->ContextRecord->Rip; 2380 #else 2381 address pc = (address) exceptionInfo->ContextRecord->Eip; 2382 #endif 2383 Thread* t = Thread::current_or_null_safe(); 2384 2385 // Handle SafeFetch32 and SafeFetchN exceptions. 2386 if (StubRoutines::is_safefetch_fault(pc)) { 2387 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc)); 2388 } 2389 2390 #ifndef _WIN64 2391 // Execution protection violation - win32 running on AMD64 only 2392 // Handled first to avoid misdiagnosis as a "normal" access violation; 2393 // This is safe to do because we have a new/unique ExceptionInformation 2394 // code for this condition. 2395 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2396 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2397 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2398 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2399 2400 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2401 int page_size = os::vm_page_size(); 2402 2403 // Make sure the pc and the faulting address are sane. 2404 // 2405 // If an instruction spans a page boundary, and the page containing 2406 // the beginning of the instruction is executable but the following 2407 // page is not, the pc and the faulting address might be slightly 2408 // different - we still want to unguard the 2nd page in this case. 2409 // 2410 // 15 bytes seems to be a (very) safe value for max instruction size. 2411 bool pc_is_near_addr = 2412 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2413 bool instr_spans_page_boundary = 2414 (align_down((intptr_t) pc ^ (intptr_t) addr, 2415 (intptr_t) page_size) > 0); 2416 2417 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2418 static volatile address last_addr = 2419 (address) os::non_memory_address_word(); 2420 2421 // In conservative mode, don't unguard unless the address is in the VM 2422 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2423 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2424 2425 // Set memory to RWX and retry 2426 address page_start = align_down(addr, page_size); 2427 bool res = os::protect_memory((char*) page_start, page_size, 2428 os::MEM_PROT_RWX); 2429 2430 log_debug(os)("Execution protection violation " 2431 "at " INTPTR_FORMAT 2432 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr), 2433 p2i(page_start), (res ? "success" : os::strerror(errno))); 2434 2435 // Set last_addr so if we fault again at the same address, we don't 2436 // end up in an endless loop. 2437 // 2438 // There are two potential complications here. Two threads trapping 2439 // at the same address at the same time could cause one of the 2440 // threads to think it already unguarded, and abort the VM. Likely 2441 // very rare. 2442 // 2443 // The other race involves two threads alternately trapping at 2444 // different addresses and failing to unguard the page, resulting in 2445 // an endless loop. This condition is probably even more unlikely 2446 // than the first. 2447 // 2448 // Although both cases could be avoided by using locks or thread 2449 // local last_addr, these solutions are unnecessary complication: 2450 // this handler is a best-effort safety net, not a complete solution. 2451 // It is disabled by default and should only be used as a workaround 2452 // in case we missed any no-execute-unsafe VM code. 2453 2454 last_addr = addr; 2455 2456 return EXCEPTION_CONTINUE_EXECUTION; 2457 } 2458 } 2459 2460 // Last unguard failed or not unguarding 2461 tty->print_raw_cr("Execution protection violation"); 2462 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2463 exceptionInfo->ContextRecord); 2464 return EXCEPTION_CONTINUE_SEARCH; 2465 } 2466 } 2467 #endif // _WIN64 2468 2469 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) && 2470 VM_Version::is_cpuinfo_segv_addr(pc)) { 2471 // Verify that OS save/restore AVX registers. 2472 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr()); 2473 } 2474 2475 if (t != NULL && t->is_Java_thread()) { 2476 JavaThread* thread = (JavaThread*) t; 2477 bool in_java = thread->thread_state() == _thread_in_Java; 2478 2479 // Handle potential stack overflows up front. 2480 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2481 if (thread->stack_guards_enabled()) { 2482 if (in_java) { 2483 frame fr; 2484 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2485 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2486 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) { 2487 assert(fr.is_java_frame(), "Must be a Java frame"); 2488 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr); 2489 } 2490 } 2491 // Yellow zone violation. The o/s has unprotected the first yellow 2492 // zone page for us. Note: must call disable_stack_yellow_zone to 2493 // update the enabled status, even if the zone contains only one page. 2494 assert(thread->thread_state() != _thread_in_vm, "Undersized StackShadowPages"); 2495 thread->disable_stack_yellow_reserved_zone(); 2496 // If not in java code, return and hope for the best. 2497 return in_java 2498 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2499 : EXCEPTION_CONTINUE_EXECUTION; 2500 } else { 2501 // Fatal red zone violation. 2502 thread->disable_stack_red_zone(); 2503 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2504 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2505 exceptionInfo->ContextRecord); 2506 return EXCEPTION_CONTINUE_SEARCH; 2507 } 2508 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2509 // Either stack overflow or null pointer exception. 2510 if (in_java) { 2511 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2512 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2513 address stack_end = thread->stack_end(); 2514 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2515 // Stack overflow. 2516 assert(!os::uses_stack_guard_pages(), 2517 "should be caught by red zone code above."); 2518 return Handle_Exception(exceptionInfo, 2519 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2520 } 2521 // Check for safepoint polling and implicit null 2522 // We only expect null pointers in the stubs (vtable) 2523 // the rest are checked explicitly now. 2524 CodeBlob* cb = CodeCache::find_blob(pc); 2525 if (cb != NULL) { 2526 if (os::is_poll_address(addr)) { 2527 address stub = SharedRuntime::get_poll_stub(pc); 2528 return Handle_Exception(exceptionInfo, stub); 2529 } 2530 } 2531 { 2532 #ifdef _WIN64 2533 // If it's a legal stack address map the entire region in 2534 // 2535 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2536 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2537 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) { 2538 addr = (address)((uintptr_t)addr & 2539 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2540 os::commit_memory((char *)addr, thread->stack_base() - addr, 2541 !ExecMem); 2542 return EXCEPTION_CONTINUE_EXECUTION; 2543 } else 2544 #endif 2545 { 2546 // Null pointer exception. 2547 if (MacroAssembler::uses_implicit_null_check((void*)addr)) { 2548 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2549 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2550 } 2551 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2552 exceptionInfo->ContextRecord); 2553 return EXCEPTION_CONTINUE_SEARCH; 2554 } 2555 } 2556 } 2557 2558 #ifdef _WIN64 2559 // Special care for fast JNI field accessors. 2560 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2561 // in and the heap gets shrunk before the field access. 2562 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2563 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2564 if (addr != (address)-1) { 2565 return Handle_Exception(exceptionInfo, addr); 2566 } 2567 } 2568 #endif 2569 2570 // Stack overflow or null pointer exception in native code. 2571 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2572 exceptionInfo->ContextRecord); 2573 return EXCEPTION_CONTINUE_SEARCH; 2574 } // /EXCEPTION_ACCESS_VIOLATION 2575 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2576 2577 if (exception_code == EXCEPTION_IN_PAGE_ERROR) { 2578 CompiledMethod* nm = NULL; 2579 JavaThread* thread = (JavaThread*)t; 2580 if (in_java) { 2581 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); 2582 nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL; 2583 } 2584 2585 bool is_unsafe_arraycopy = (thread->thread_state() == _thread_in_native || in_java) && UnsafeCopyMemory::contains_pc(pc); 2586 if (((thread->thread_state() == _thread_in_vm || 2587 thread->thread_state() == _thread_in_native || 2588 is_unsafe_arraycopy) && 2589 thread->doing_unsafe_access()) || 2590 (nm != NULL && nm->has_unsafe_access())) { 2591 address next_pc = Assembler::locate_next_instruction(pc); 2592 if (is_unsafe_arraycopy) { 2593 next_pc = UnsafeCopyMemory::page_error_continue_pc(pc); 2594 } 2595 return Handle_Exception(exceptionInfo, SharedRuntime::handle_unsafe_access(thread, next_pc)); 2596 } 2597 } 2598 2599 if (in_java) { 2600 switch (exception_code) { 2601 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2602 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2603 2604 case EXCEPTION_INT_OVERFLOW: 2605 return Handle_IDiv_Exception(exceptionInfo); 2606 2607 } // switch 2608 } 2609 if (((thread->thread_state() == _thread_in_Java) || 2610 (thread->thread_state() == _thread_in_native)) && 2611 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) { 2612 LONG result=Handle_FLT_Exception(exceptionInfo); 2613 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2614 } 2615 } 2616 2617 if (exception_code != EXCEPTION_BREAKPOINT) { 2618 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2619 exceptionInfo->ContextRecord); 2620 } 2621 return EXCEPTION_CONTINUE_SEARCH; 2622 } 2623 2624 #ifndef _WIN64 2625 // Special care for fast JNI accessors. 2626 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2627 // the heap gets shrunk before the field access. 2628 // Need to install our own structured exception handler since native code may 2629 // install its own. 2630 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2631 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2632 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2633 address pc = (address) exceptionInfo->ContextRecord->Eip; 2634 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2635 if (addr != (address)-1) { 2636 return Handle_Exception(exceptionInfo, addr); 2637 } 2638 } 2639 return EXCEPTION_CONTINUE_SEARCH; 2640 } 2641 2642 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \ 2643 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \ 2644 jobject obj, \ 2645 jfieldID fieldID) { \ 2646 __try { \ 2647 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \ 2648 obj, \ 2649 fieldID); \ 2650 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \ 2651 _exception_info())) { \ 2652 } \ 2653 return 0; \ 2654 } 2655 2656 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2657 DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2658 DEFINE_FAST_GETFIELD(jchar, char, Char) 2659 DEFINE_FAST_GETFIELD(jshort, short, Short) 2660 DEFINE_FAST_GETFIELD(jint, int, Int) 2661 DEFINE_FAST_GETFIELD(jlong, long, Long) 2662 DEFINE_FAST_GETFIELD(jfloat, float, Float) 2663 DEFINE_FAST_GETFIELD(jdouble, double, Double) 2664 2665 address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2666 switch (type) { 2667 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2668 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2669 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2670 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2671 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2672 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2673 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2674 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2675 default: ShouldNotReachHere(); 2676 } 2677 return (address)-1; 2678 } 2679 #endif 2680 2681 // Virtual Memory 2682 2683 int os::vm_page_size() { return os::win32::vm_page_size(); } 2684 int os::vm_allocation_granularity() { 2685 return os::win32::vm_allocation_granularity(); 2686 } 2687 2688 // Windows large page support is available on Windows 2003. In order to use 2689 // large page memory, the administrator must first assign additional privilege 2690 // to the user: 2691 // + select Control Panel -> Administrative Tools -> Local Security Policy 2692 // + select Local Policies -> User Rights Assignment 2693 // + double click "Lock pages in memory", add users and/or groups 2694 // + reboot 2695 // Note the above steps are needed for administrator as well, as administrators 2696 // by default do not have the privilege to lock pages in memory. 2697 // 2698 // Note about Windows 2003: although the API supports committing large page 2699 // memory on a page-by-page basis and VirtualAlloc() returns success under this 2700 // scenario, I found through experiment it only uses large page if the entire 2701 // memory region is reserved and committed in a single VirtualAlloc() call. 2702 // This makes Windows large page support more or less like Solaris ISM, in 2703 // that the entire heap must be committed upfront. This probably will change 2704 // in the future, if so the code below needs to be revisited. 2705 2706 #ifndef MEM_LARGE_PAGES 2707 #define MEM_LARGE_PAGES 0x20000000 2708 #endif 2709 2710 static HANDLE _hProcess; 2711 static HANDLE _hToken; 2712 2713 // Container for NUMA node list info 2714 class NUMANodeListHolder { 2715 private: 2716 int *_numa_used_node_list; // allocated below 2717 int _numa_used_node_count; 2718 2719 void free_node_list() { 2720 if (_numa_used_node_list != NULL) { 2721 FREE_C_HEAP_ARRAY(int, _numa_used_node_list); 2722 } 2723 } 2724 2725 public: 2726 NUMANodeListHolder() { 2727 _numa_used_node_count = 0; 2728 _numa_used_node_list = NULL; 2729 // do rest of initialization in build routine (after function pointers are set up) 2730 } 2731 2732 ~NUMANodeListHolder() { 2733 free_node_list(); 2734 } 2735 2736 bool build() { 2737 DWORD_PTR proc_aff_mask; 2738 DWORD_PTR sys_aff_mask; 2739 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false; 2740 ULONG highest_node_number; 2741 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false; 2742 free_node_list(); 2743 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal); 2744 for (unsigned int i = 0; i <= highest_node_number; i++) { 2745 ULONGLONG proc_mask_numa_node; 2746 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false; 2747 if ((proc_aff_mask & proc_mask_numa_node)!=0) { 2748 _numa_used_node_list[_numa_used_node_count++] = i; 2749 } 2750 } 2751 return (_numa_used_node_count > 1); 2752 } 2753 2754 int get_count() { return _numa_used_node_count; } 2755 int get_node_list_entry(int n) { 2756 // for indexes out of range, returns -1 2757 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1); 2758 } 2759 2760 } numa_node_list_holder; 2761 2762 2763 2764 static size_t _large_page_size = 0; 2765 2766 static bool request_lock_memory_privilege() { 2767 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2768 os::current_process_id()); 2769 2770 LUID luid; 2771 if (_hProcess != NULL && 2772 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2773 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2774 2775 TOKEN_PRIVILEGES tp; 2776 tp.PrivilegeCount = 1; 2777 tp.Privileges[0].Luid = luid; 2778 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2779 2780 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2781 // privilege. Check GetLastError() too. See MSDN document. 2782 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2783 (GetLastError() == ERROR_SUCCESS)) { 2784 return true; 2785 } 2786 } 2787 2788 return false; 2789 } 2790 2791 static void cleanup_after_large_page_init() { 2792 if (_hProcess) CloseHandle(_hProcess); 2793 _hProcess = NULL; 2794 if (_hToken) CloseHandle(_hToken); 2795 _hToken = NULL; 2796 } 2797 2798 static bool numa_interleaving_init() { 2799 bool success = false; 2800 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving); 2801 2802 // print a warning if UseNUMAInterleaving flag is specified on command line 2803 bool warn_on_failure = use_numa_interleaving_specified; 2804 #define WARN(msg) if (warn_on_failure) { warning(msg); } 2805 2806 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages) 2807 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2808 NUMAInterleaveGranularity = align_up(NUMAInterleaveGranularity, min_interleave_granularity); 2809 2810 if (numa_node_list_holder.build()) { 2811 if (log_is_enabled(Debug, os, cpu)) { 2812 Log(os, cpu) log; 2813 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count()); 2814 for (int i = 0; i < numa_node_list_holder.get_count(); i++) { 2815 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i)); 2816 } 2817 } 2818 success = true; 2819 } else { 2820 WARN("Process does not cover multiple NUMA nodes."); 2821 } 2822 if (!success) { 2823 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag."); 2824 } 2825 return success; 2826 #undef WARN 2827 } 2828 2829 // this routine is used whenever we need to reserve a contiguous VA range 2830 // but we need to make separate VirtualAlloc calls for each piece of the range 2831 // Reasons for doing this: 2832 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise) 2833 // * UseNUMAInterleaving requires a separate node for each piece 2834 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, 2835 DWORD prot, 2836 bool should_inject_error = false) { 2837 char * p_buf; 2838 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size 2839 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2840 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size; 2841 2842 // first reserve enough address space in advance since we want to be 2843 // able to break a single contiguous virtual address range into multiple 2844 // large page commits but WS2003 does not allow reserving large page space 2845 // so we just use 4K pages for reserve, this gives us a legal contiguous 2846 // address space. then we will deallocate that reservation, and re alloc 2847 // using large pages 2848 const size_t size_of_reserve = bytes + chunk_size; 2849 if (bytes > size_of_reserve) { 2850 // Overflowed. 2851 return NULL; 2852 } 2853 p_buf = (char *) VirtualAlloc(addr, 2854 size_of_reserve, // size of Reserve 2855 MEM_RESERVE, 2856 PAGE_READWRITE); 2857 // If reservation failed, return NULL 2858 if (p_buf == NULL) return NULL; 2859 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC); 2860 os::release_memory(p_buf, bytes + chunk_size); 2861 2862 // we still need to round up to a page boundary (in case we are using large pages) 2863 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size) 2864 // instead we handle this in the bytes_to_rq computation below 2865 p_buf = align_up(p_buf, page_size); 2866 2867 // now go through and allocate one chunk at a time until all bytes are 2868 // allocated 2869 size_t bytes_remaining = bytes; 2870 // An overflow of align_up() would have been caught above 2871 // in the calculation of size_of_reserve. 2872 char * next_alloc_addr = p_buf; 2873 HANDLE hProc = GetCurrentProcess(); 2874 2875 #ifdef ASSERT 2876 // Variable for the failure injection 2877 int ran_num = os::random(); 2878 size_t fail_after = ran_num % bytes; 2879 #endif 2880 2881 int count=0; 2882 while (bytes_remaining) { 2883 // select bytes_to_rq to get to the next chunk_size boundary 2884 2885 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size)); 2886 // Note allocate and commit 2887 char * p_new; 2888 2889 #ifdef ASSERT 2890 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after); 2891 #else 2892 const bool inject_error_now = false; 2893 #endif 2894 2895 if (inject_error_now) { 2896 p_new = NULL; 2897 } else { 2898 if (!UseNUMAInterleaving) { 2899 p_new = (char *) VirtualAlloc(next_alloc_addr, 2900 bytes_to_rq, 2901 flags, 2902 prot); 2903 } else { 2904 // get the next node to use from the used_node_list 2905 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected"); 2906 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count()); 2907 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node); 2908 } 2909 } 2910 2911 if (p_new == NULL) { 2912 // Free any allocated pages 2913 if (next_alloc_addr > p_buf) { 2914 // Some memory was committed so release it. 2915 size_t bytes_to_release = bytes - bytes_remaining; 2916 // NMT has yet to record any individual blocks, so it 2917 // need to create a dummy 'reserve' record to match 2918 // the release. 2919 MemTracker::record_virtual_memory_reserve((address)p_buf, 2920 bytes_to_release, CALLER_PC); 2921 os::release_memory(p_buf, bytes_to_release); 2922 } 2923 #ifdef ASSERT 2924 if (should_inject_error) { 2925 log_develop_debug(pagesize)("Reserving pages individually failed."); 2926 } 2927 #endif 2928 return NULL; 2929 } 2930 2931 bytes_remaining -= bytes_to_rq; 2932 next_alloc_addr += bytes_to_rq; 2933 count++; 2934 } 2935 // Although the memory is allocated individually, it is returned as one. 2936 // NMT records it as one block. 2937 if ((flags & MEM_COMMIT) != 0) { 2938 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC); 2939 } else { 2940 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC); 2941 } 2942 2943 // made it this far, success 2944 return p_buf; 2945 } 2946 2947 2948 2949 void os::large_page_init() { 2950 if (!UseLargePages) return; 2951 2952 // print a warning if any large page related flag is specified on command line 2953 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2954 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2955 bool success = false; 2956 2957 #define WARN(msg) if (warn_on_failure) { warning(msg); } 2958 if (request_lock_memory_privilege()) { 2959 size_t s = GetLargePageMinimum(); 2960 if (s) { 2961 #if defined(IA32) || defined(AMD64) 2962 if (s > 4*M || LargePageSizeInBytes > 4*M) { 2963 WARN("JVM cannot use large pages bigger than 4mb."); 2964 } else { 2965 #endif 2966 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 2967 _large_page_size = LargePageSizeInBytes; 2968 } else { 2969 _large_page_size = s; 2970 } 2971 success = true; 2972 #if defined(IA32) || defined(AMD64) 2973 } 2974 #endif 2975 } else { 2976 WARN("Large page is not supported by the processor."); 2977 } 2978 } else { 2979 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 2980 } 2981 #undef WARN 2982 2983 const size_t default_page_size = (size_t) vm_page_size(); 2984 if (success && _large_page_size > default_page_size) { 2985 _page_sizes[0] = _large_page_size; 2986 _page_sizes[1] = default_page_size; 2987 _page_sizes[2] = 0; 2988 } 2989 2990 cleanup_after_large_page_init(); 2991 UseLargePages = success; 2992 } 2993 2994 int os::create_file_for_heap(const char* dir) { 2995 2996 const char name_template[] = "/jvmheap.XXXXXX"; 2997 2998 size_t fullname_len = strlen(dir) + strlen(name_template); 2999 char *fullname = (char*)os::malloc(fullname_len + 1, mtInternal); 3000 if (fullname == NULL) { 3001 vm_exit_during_initialization(err_msg("Malloc failed during creation of backing file for heap (%s)", os::strerror(errno))); 3002 return -1; 3003 } 3004 int n = snprintf(fullname, fullname_len + 1, "%s%s", dir, name_template); 3005 assert((size_t)n == fullname_len, "Unexpected number of characters in string"); 3006 3007 os::native_path(fullname); 3008 3009 char *path = _mktemp(fullname); 3010 if (path == NULL) { 3011 warning("_mktemp could not create file name from template %s (%s)", fullname, os::strerror(errno)); 3012 os::free(fullname); 3013 return -1; 3014 } 3015 3016 int fd = _open(path, O_RDWR | O_CREAT | O_TEMPORARY | O_EXCL, S_IWRITE | S_IREAD); 3017 3018 os::free(fullname); 3019 if (fd < 0) { 3020 warning("Problem opening file for heap (%s)", os::strerror(errno)); 3021 return -1; 3022 } 3023 return fd; 3024 } 3025 3026 // If 'base' is not NULL, function will return NULL if it cannot get 'base' 3027 char* os::map_memory_to_file(char* base, size_t size, int fd) { 3028 assert(fd != -1, "File descriptor is not valid"); 3029 3030 HANDLE fh = (HANDLE)_get_osfhandle(fd); 3031 #ifdef _LP64 3032 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE, 3033 (DWORD)(size >> 32), (DWORD)(size & 0xFFFFFFFF), NULL); 3034 #else 3035 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE, 3036 0, (DWORD)size, NULL); 3037 #endif 3038 if (fileMapping == NULL) { 3039 if (GetLastError() == ERROR_DISK_FULL) { 3040 vm_exit_during_initialization(err_msg("Could not allocate sufficient disk space for Java heap")); 3041 } 3042 else { 3043 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); 3044 } 3045 3046 return NULL; 3047 } 3048 3049 LPVOID addr = MapViewOfFileEx(fileMapping, FILE_MAP_WRITE, 0, 0, size, base); 3050 3051 CloseHandle(fileMapping); 3052 3053 return (char*)addr; 3054 } 3055 3056 char* os::replace_existing_mapping_with_file_mapping(char* base, size_t size, int fd) { 3057 assert(fd != -1, "File descriptor is not valid"); 3058 assert(base != NULL, "Base address cannot be NULL"); 3059 3060 release_memory(base, size); 3061 return map_memory_to_file(base, size, fd); 3062 } 3063 3064 // On win32, one cannot release just a part of reserved memory, it's an 3065 // all or nothing deal. When we split a reservation, we must break the 3066 // reservation into two reservations. 3067 void os::pd_split_reserved_memory(char *base, size_t size, size_t split, 3068 bool realloc) { 3069 if (size > 0) { 3070 release_memory(base, size); 3071 if (realloc) { 3072 reserve_memory(split, base); 3073 } 3074 if (size != split) { 3075 reserve_memory(size - split, base + split); 3076 } 3077 } 3078 } 3079 3080 // Multiple threads can race in this code but it's not possible to unmap small sections of 3081 // virtual space to get requested alignment, like posix-like os's. 3082 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe. 3083 char* os::reserve_memory_aligned(size_t size, size_t alignment, int file_desc) { 3084 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 3085 "Alignment must be a multiple of allocation granularity (page size)"); 3086 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 3087 3088 size_t extra_size = size + alignment; 3089 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 3090 3091 char* aligned_base = NULL; 3092 3093 do { 3094 char* extra_base = os::reserve_memory(extra_size, NULL, alignment, file_desc); 3095 if (extra_base == NULL) { 3096 return NULL; 3097 } 3098 // Do manual alignment 3099 aligned_base = align_up(extra_base, alignment); 3100 3101 if (file_desc != -1) { 3102 os::unmap_memory(extra_base, extra_size); 3103 } else { 3104 os::release_memory(extra_base, extra_size); 3105 } 3106 3107 aligned_base = os::reserve_memory(size, aligned_base, 0, file_desc); 3108 3109 } while (aligned_base == NULL); 3110 3111 return aligned_base; 3112 } 3113 3114 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 3115 assert((size_t)addr % os::vm_allocation_granularity() == 0, 3116 "reserve alignment"); 3117 assert(bytes % os::vm_page_size() == 0, "reserve page size"); 3118 char* res; 3119 // note that if UseLargePages is on, all the areas that require interleaving 3120 // will go thru reserve_memory_special rather than thru here. 3121 bool use_individual = (UseNUMAInterleaving && !UseLargePages); 3122 if (!use_individual) { 3123 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 3124 } else { 3125 elapsedTimer reserveTimer; 3126 if (Verbose && PrintMiscellaneous) reserveTimer.start(); 3127 // in numa interleaving, we have to allocate pages individually 3128 // (well really chunks of NUMAInterleaveGranularity size) 3129 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE); 3130 if (res == NULL) { 3131 warning("NUMA page allocation failed"); 3132 } 3133 if (Verbose && PrintMiscellaneous) { 3134 reserveTimer.stop(); 3135 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes, 3136 reserveTimer.milliseconds(), reserveTimer.ticks()); 3137 } 3138 } 3139 assert(res == NULL || addr == NULL || addr == res, 3140 "Unexpected address from reserve."); 3141 3142 return res; 3143 } 3144 3145 // Reserve memory at an arbitrary address, only if that area is 3146 // available (and not reserved for something else). 3147 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3148 // Windows os::reserve_memory() fails of the requested address range is 3149 // not avilable. 3150 return reserve_memory(bytes, requested_addr); 3151 } 3152 3153 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) { 3154 assert(file_desc >= 0, "file_desc is not valid"); 3155 return map_memory_to_file(requested_addr, bytes, file_desc); 3156 } 3157 3158 size_t os::large_page_size() { 3159 return _large_page_size; 3160 } 3161 3162 bool os::can_commit_large_page_memory() { 3163 // Windows only uses large page memory when the entire region is reserved 3164 // and committed in a single VirtualAlloc() call. This may change in the 3165 // future, but with Windows 2003 it's not possible to commit on demand. 3166 return false; 3167 } 3168 3169 bool os::can_execute_large_page_memory() { 3170 return true; 3171 } 3172 3173 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, 3174 bool exec) { 3175 assert(UseLargePages, "only for large pages"); 3176 3177 if (!is_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { 3178 return NULL; // Fallback to small pages. 3179 } 3180 3181 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 3182 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3183 3184 // with large pages, there are two cases where we need to use Individual Allocation 3185 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003) 3186 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page 3187 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) { 3188 log_debug(pagesize)("Reserving large pages individually."); 3189 3190 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError); 3191 if (p_buf == NULL) { 3192 // give an appropriate warning message 3193 if (UseNUMAInterleaving) { 3194 warning("NUMA large page allocation failed, UseLargePages flag ignored"); 3195 } 3196 if (UseLargePagesIndividualAllocation) { 3197 warning("Individually allocated large pages failed, " 3198 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 3199 } 3200 return NULL; 3201 } 3202 3203 return p_buf; 3204 3205 } else { 3206 log_debug(pagesize)("Reserving large pages in a single large chunk."); 3207 3208 // normal policy just allocate it all at once 3209 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3210 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); 3211 if (res != NULL) { 3212 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC); 3213 } 3214 3215 return res; 3216 } 3217 } 3218 3219 bool os::release_memory_special(char* base, size_t bytes) { 3220 assert(base != NULL, "Sanity check"); 3221 return release_memory(base, bytes); 3222 } 3223 3224 void os::print_statistics() { 3225 } 3226 3227 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) { 3228 int err = os::get_last_error(); 3229 char buf[256]; 3230 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3231 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 3232 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3233 exec, buf_len != 0 ? buf : "<no_error_string>", err); 3234 } 3235 3236 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 3237 if (bytes == 0) { 3238 // Don't bother the OS with noops. 3239 return true; 3240 } 3241 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 3242 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 3243 // Don't attempt to print anything if the OS call fails. We're 3244 // probably low on resources, so the print itself may cause crashes. 3245 3246 // unless we have NUMAInterleaving enabled, the range of a commit 3247 // is always within a reserve covered by a single VirtualAlloc 3248 // in that case we can just do a single commit for the requested size 3249 if (!UseNUMAInterleaving) { 3250 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) { 3251 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3252 return false; 3253 } 3254 if (exec) { 3255 DWORD oldprot; 3256 // Windows doc says to use VirtualProtect to get execute permissions 3257 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) { 3258 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3259 return false; 3260 } 3261 } 3262 return true; 3263 } else { 3264 3265 // when NUMAInterleaving is enabled, the commit might cover a range that 3266 // came from multiple VirtualAlloc reserves (using allocate_pages_individually). 3267 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery 3268 // returns represents the number of bytes that can be committed in one step. 3269 size_t bytes_remaining = bytes; 3270 char * next_alloc_addr = addr; 3271 while (bytes_remaining > 0) { 3272 MEMORY_BASIC_INFORMATION alloc_info; 3273 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info)); 3274 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3275 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, 3276 PAGE_READWRITE) == NULL) { 3277 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3278 exec);) 3279 return false; 3280 } 3281 if (exec) { 3282 DWORD oldprot; 3283 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, 3284 PAGE_EXECUTE_READWRITE, &oldprot)) { 3285 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3286 exec);) 3287 return false; 3288 } 3289 } 3290 bytes_remaining -= bytes_to_rq; 3291 next_alloc_addr += bytes_to_rq; 3292 } 3293 } 3294 // if we made it this far, return true 3295 return true; 3296 } 3297 3298 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 3299 bool exec) { 3300 // alignment_hint is ignored on this OS 3301 return pd_commit_memory(addr, size, exec); 3302 } 3303 3304 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 3305 const char* mesg) { 3306 assert(mesg != NULL, "mesg must be specified"); 3307 if (!pd_commit_memory(addr, size, exec)) { 3308 warn_fail_commit_memory(addr, size, exec); 3309 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 3310 } 3311 } 3312 3313 void os::pd_commit_memory_or_exit(char* addr, size_t size, 3314 size_t alignment_hint, bool exec, 3315 const char* mesg) { 3316 // alignment_hint is ignored on this OS 3317 pd_commit_memory_or_exit(addr, size, exec, mesg); 3318 } 3319 3320 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3321 if (bytes == 0) { 3322 // Don't bother the OS with noops. 3323 return true; 3324 } 3325 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 3326 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 3327 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0); 3328 } 3329 3330 bool os::pd_release_memory(char* addr, size_t bytes) { 3331 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 3332 } 3333 3334 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 3335 return os::commit_memory(addr, size, !ExecMem); 3336 } 3337 3338 bool os::remove_stack_guard_pages(char* addr, size_t size) { 3339 return os::uncommit_memory(addr, size); 3340 } 3341 3342 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) { 3343 uint count = 0; 3344 bool ret = false; 3345 size_t bytes_remaining = bytes; 3346 char * next_protect_addr = addr; 3347 3348 // Use VirtualQuery() to get the chunk size. 3349 while (bytes_remaining) { 3350 MEMORY_BASIC_INFORMATION alloc_info; 3351 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) { 3352 return false; 3353 } 3354 3355 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3356 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving, 3357 // but we don't distinguish here as both cases are protected by same API. 3358 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0; 3359 warning("Failed protecting pages individually for chunk #%u", count); 3360 if (!ret) { 3361 return false; 3362 } 3363 3364 bytes_remaining -= bytes_to_protect; 3365 next_protect_addr += bytes_to_protect; 3366 count++; 3367 } 3368 return ret; 3369 } 3370 3371 // Set protections specified 3372 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3373 bool is_committed) { 3374 unsigned int p = 0; 3375 switch (prot) { 3376 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 3377 case MEM_PROT_READ: p = PAGE_READONLY; break; 3378 case MEM_PROT_RW: p = PAGE_READWRITE; break; 3379 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 3380 default: 3381 ShouldNotReachHere(); 3382 } 3383 3384 DWORD old_status; 3385 3386 // Strange enough, but on Win32 one can change protection only for committed 3387 // memory, not a big deal anyway, as bytes less or equal than 64K 3388 if (!is_committed) { 3389 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX, 3390 "cannot commit protection page"); 3391 } 3392 // One cannot use os::guard_memory() here, as on Win32 guard page 3393 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 3394 // 3395 // Pages in the region become guard pages. Any attempt to access a guard page 3396 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 3397 // the guard page status. Guard pages thus act as a one-time access alarm. 3398 bool ret; 3399 if (UseNUMAInterleaving) { 3400 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time, 3401 // so we must protect the chunks individually. 3402 ret = protect_pages_individually(addr, bytes, p, &old_status); 3403 } else { 3404 ret = VirtualProtect(addr, bytes, p, &old_status) != 0; 3405 } 3406 #ifdef ASSERT 3407 if (!ret) { 3408 int err = os::get_last_error(); 3409 char buf[256]; 3410 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3411 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT 3412 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3413 buf_len != 0 ? buf : "<no_error_string>", err); 3414 } 3415 #endif 3416 return ret; 3417 } 3418 3419 bool os::guard_memory(char* addr, size_t bytes) { 3420 DWORD old_status; 3421 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 3422 } 3423 3424 bool os::unguard_memory(char* addr, size_t bytes) { 3425 DWORD old_status; 3426 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 3427 } 3428 3429 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3430 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3431 void os::numa_make_global(char *addr, size_t bytes) { } 3432 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 3433 bool os::numa_topology_changed() { return false; } 3434 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); } 3435 int os::numa_get_group_id() { return 0; } 3436 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 3437 if (numa_node_list_holder.get_count() == 0 && size > 0) { 3438 // Provide an answer for UMA systems 3439 ids[0] = 0; 3440 return 1; 3441 } else { 3442 // check for size bigger than actual groups_num 3443 size = MIN2(size, numa_get_groups_num()); 3444 for (int i = 0; i < (int)size; i++) { 3445 ids[i] = numa_node_list_holder.get_node_list_entry(i); 3446 } 3447 return size; 3448 } 3449 } 3450 3451 bool os::get_page_info(char *start, page_info* info) { 3452 return false; 3453 } 3454 3455 char *os::scan_pages(char *start, char* end, page_info* page_expected, 3456 page_info* page_found) { 3457 return end; 3458 } 3459 3460 char* os::non_memory_address_word() { 3461 // Must never look like an address returned by reserve_memory, 3462 // even in its subfields (as defined by the CPU immediate fields, 3463 // if the CPU splits constants across multiple instructions). 3464 return (char*)-1; 3465 } 3466 3467 #define MAX_ERROR_COUNT 100 3468 #define SYS_THREAD_ERROR 0xffffffffUL 3469 3470 void os::pd_start_thread(Thread* thread) { 3471 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 3472 // Returns previous suspend state: 3473 // 0: Thread was not suspended 3474 // 1: Thread is running now 3475 // >1: Thread is still suspended. 3476 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3477 } 3478 3479 class HighResolutionInterval : public CHeapObj<mtThread> { 3480 // The default timer resolution seems to be 10 milliseconds. 3481 // (Where is this written down?) 3482 // If someone wants to sleep for only a fraction of the default, 3483 // then we set the timer resolution down to 1 millisecond for 3484 // the duration of their interval. 3485 // We carefully set the resolution back, since otherwise we 3486 // seem to incur an overhead (3%?) that we don't need. 3487 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 3488 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 3489 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 3490 // timeBeginPeriod() if the relative error exceeded some threshold. 3491 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 3492 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 3493 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 3494 // resolution timers running. 3495 private: 3496 jlong resolution; 3497 public: 3498 HighResolutionInterval(jlong ms) { 3499 resolution = ms % 10L; 3500 if (resolution != 0) { 3501 MMRESULT result = timeBeginPeriod(1L); 3502 } 3503 } 3504 ~HighResolutionInterval() { 3505 if (resolution != 0) { 3506 MMRESULT result = timeEndPeriod(1L); 3507 } 3508 resolution = 0L; 3509 } 3510 }; 3511 3512 int os::sleep(Thread* thread, jlong ms, bool interruptable) { 3513 jlong limit = (jlong) MAXDWORD; 3514 3515 while (ms > limit) { 3516 int res; 3517 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) { 3518 return res; 3519 } 3520 ms -= limit; 3521 } 3522 3523 assert(thread == Thread::current(), "thread consistency check"); 3524 OSThread* osthread = thread->osthread(); 3525 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 3526 int result; 3527 if (interruptable) { 3528 assert(thread->is_Java_thread(), "must be java thread"); 3529 JavaThread *jt = (JavaThread *) thread; 3530 ThreadBlockInVM tbivm(jt); 3531 3532 jt->set_suspend_equivalent(); 3533 // cleared by handle_special_suspend_equivalent_condition() or 3534 // java_suspend_self() via check_and_wait_while_suspended() 3535 3536 HANDLE events[1]; 3537 events[0] = osthread->interrupt_event(); 3538 HighResolutionInterval *phri=NULL; 3539 if (!ForceTimeHighResolution) { 3540 phri = new HighResolutionInterval(ms); 3541 } 3542 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 3543 result = OS_TIMEOUT; 3544 } else { 3545 ResetEvent(osthread->interrupt_event()); 3546 osthread->set_interrupted(false); 3547 result = OS_INTRPT; 3548 } 3549 delete phri; //if it is NULL, harmless 3550 3551 // were we externally suspended while we were waiting? 3552 jt->check_and_wait_while_suspended(); 3553 } else { 3554 assert(!thread->is_Java_thread(), "must not be java thread"); 3555 Sleep((long) ms); 3556 result = OS_TIMEOUT; 3557 } 3558 return result; 3559 } 3560 3561 // Short sleep, direct OS call. 3562 // 3563 // ms = 0, means allow others (if any) to run. 3564 // 3565 void os::naked_short_sleep(jlong ms) { 3566 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3567 Sleep(ms); 3568 } 3569 3570 // Windows does not provide sleep functionality with nanosecond resolution, so we 3571 // try to approximate this with spinning combined with yielding if another thread 3572 // is ready to run on the current processor. 3573 void os::naked_short_nanosleep(jlong ns) { 3574 assert(ns > -1 && ns < NANOUNITS, "Un-interruptable sleep, short time use only"); 3575 3576 int64_t start = os::javaTimeNanos(); 3577 do { 3578 if (SwitchToThread() == 0) { 3579 // Nothing else is ready to run on this cpu, spin a little 3580 SpinPause(); 3581 } 3582 } while (os::javaTimeNanos() - start < ns); 3583 } 3584 3585 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3586 void os::infinite_sleep() { 3587 while (true) { // sleep forever ... 3588 Sleep(100000); // ... 100 seconds at a time 3589 } 3590 } 3591 3592 typedef BOOL (WINAPI * STTSignature)(void); 3593 3594 void os::naked_yield() { 3595 // Consider passing back the return value from SwitchToThread(). 3596 SwitchToThread(); 3597 } 3598 3599 // Win32 only gives you access to seven real priorities at a time, 3600 // so we compress Java's ten down to seven. It would be better 3601 // if we dynamically adjusted relative priorities. 3602 3603 int os::java_to_os_priority[CriticalPriority + 1] = { 3604 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3605 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3606 THREAD_PRIORITY_LOWEST, // 2 3607 THREAD_PRIORITY_BELOW_NORMAL, // 3 3608 THREAD_PRIORITY_BELOW_NORMAL, // 4 3609 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3610 THREAD_PRIORITY_NORMAL, // 6 3611 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3612 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3613 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3614 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority 3615 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority 3616 }; 3617 3618 int prio_policy1[CriticalPriority + 1] = { 3619 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3620 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3621 THREAD_PRIORITY_LOWEST, // 2 3622 THREAD_PRIORITY_BELOW_NORMAL, // 3 3623 THREAD_PRIORITY_BELOW_NORMAL, // 4 3624 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3625 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3626 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3627 THREAD_PRIORITY_HIGHEST, // 8 3628 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3629 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority 3630 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority 3631 }; 3632 3633 static int prio_init() { 3634 // If ThreadPriorityPolicy is 1, switch tables 3635 if (ThreadPriorityPolicy == 1) { 3636 int i; 3637 for (i = 0; i < CriticalPriority + 1; i++) { 3638 os::java_to_os_priority[i] = prio_policy1[i]; 3639 } 3640 } 3641 if (UseCriticalJavaThreadPriority) { 3642 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 3643 } 3644 return 0; 3645 } 3646 3647 OSReturn os::set_native_priority(Thread* thread, int priority) { 3648 if (!UseThreadPriorities) return OS_OK; 3649 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3650 return ret ? OS_OK : OS_ERR; 3651 } 3652 3653 OSReturn os::get_native_priority(const Thread* const thread, 3654 int* priority_ptr) { 3655 if (!UseThreadPriorities) { 3656 *priority_ptr = java_to_os_priority[NormPriority]; 3657 return OS_OK; 3658 } 3659 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3660 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3661 assert(false, "GetThreadPriority failed"); 3662 return OS_ERR; 3663 } 3664 *priority_ptr = os_prio; 3665 return OS_OK; 3666 } 3667 3668 void os::interrupt(Thread* thread) { 3669 debug_only(Thread::check_for_dangling_thread_pointer(thread);) 3670 3671 OSThread* osthread = thread->osthread(); 3672 osthread->set_interrupted(true); 3673 // More than one thread can get here with the same value of osthread, 3674 // resulting in multiple notifications. We do, however, want the store 3675 // to interrupted() to be visible to other threads before we post 3676 // the interrupt event. 3677 OrderAccess::release(); 3678 SetEvent(osthread->interrupt_event()); 3679 // For JSR166: unpark after setting status 3680 if (thread->is_Java_thread()) { 3681 ((JavaThread*)thread)->parker()->unpark(); 3682 } 3683 3684 ParkEvent * ev = thread->_ParkEvent; 3685 if (ev != NULL) ev->unpark(); 3686 } 3687 3688 3689 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3690 debug_only(Thread::check_for_dangling_thread_pointer(thread);) 3691 3692 OSThread* osthread = thread->osthread(); 3693 // There is no synchronization between the setting of the interrupt 3694 // and it being cleared here. It is critical - see 6535709 - that 3695 // we only clear the interrupt state, and reset the interrupt event, 3696 // if we are going to report that we were indeed interrupted - else 3697 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups 3698 // depending on the timing. By checking thread interrupt event to see 3699 // if the thread gets real interrupt thus prevent spurious wakeup. 3700 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0); 3701 if (interrupted && clear_interrupted) { 3702 osthread->set_interrupted(false); 3703 ResetEvent(osthread->interrupt_event()); 3704 } // Otherwise leave the interrupted state alone 3705 3706 return interrupted; 3707 } 3708 3709 // GetCurrentThreadId() returns DWORD 3710 intx os::current_thread_id() { return GetCurrentThreadId(); } 3711 3712 static int _initial_pid = 0; 3713 3714 int os::current_process_id() { 3715 return (_initial_pid ? _initial_pid : _getpid()); 3716 } 3717 3718 int os::win32::_vm_page_size = 0; 3719 int os::win32::_vm_allocation_granularity = 0; 3720 int os::win32::_processor_type = 0; 3721 // Processor level is not available on non-NT systems, use vm_version instead 3722 int os::win32::_processor_level = 0; 3723 julong os::win32::_physical_memory = 0; 3724 size_t os::win32::_default_stack_size = 0; 3725 3726 intx os::win32::_os_thread_limit = 0; 3727 volatile intx os::win32::_os_thread_count = 0; 3728 3729 bool os::win32::_is_windows_server = false; 3730 3731 // 6573254 3732 // Currently, the bug is observed across all the supported Windows releases, 3733 // including the latest one (as of this writing - Windows Server 2012 R2) 3734 bool os::win32::_has_exit_bug = true; 3735 3736 void os::win32::initialize_system_info() { 3737 SYSTEM_INFO si; 3738 GetSystemInfo(&si); 3739 _vm_page_size = si.dwPageSize; 3740 _vm_allocation_granularity = si.dwAllocationGranularity; 3741 _processor_type = si.dwProcessorType; 3742 _processor_level = si.wProcessorLevel; 3743 set_processor_count(si.dwNumberOfProcessors); 3744 3745 MEMORYSTATUSEX ms; 3746 ms.dwLength = sizeof(ms); 3747 3748 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3749 // dwMemoryLoad (% of memory in use) 3750 GlobalMemoryStatusEx(&ms); 3751 _physical_memory = ms.ullTotalPhys; 3752 3753 if (FLAG_IS_DEFAULT(MaxRAM)) { 3754 // Adjust MaxRAM according to the maximum virtual address space available. 3755 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual)); 3756 } 3757 3758 OSVERSIONINFOEX oi; 3759 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 3760 GetVersionEx((OSVERSIONINFO*)&oi); 3761 switch (oi.dwPlatformId) { 3762 case VER_PLATFORM_WIN32_NT: 3763 { 3764 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3765 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER || 3766 oi.wProductType == VER_NT_SERVER) { 3767 _is_windows_server = true; 3768 } 3769 } 3770 break; 3771 default: fatal("Unknown platform"); 3772 } 3773 3774 _default_stack_size = os::current_stack_size(); 3775 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3776 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3777 "stack size not a multiple of page size"); 3778 3779 initialize_performance_counter(); 3780 } 3781 3782 3783 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, 3784 int ebuflen) { 3785 char path[MAX_PATH]; 3786 DWORD size; 3787 DWORD pathLen = (DWORD)sizeof(path); 3788 HINSTANCE result = NULL; 3789 3790 // only allow library name without path component 3791 assert(strchr(name, '\\') == NULL, "path not allowed"); 3792 assert(strchr(name, ':') == NULL, "path not allowed"); 3793 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) { 3794 jio_snprintf(ebuf, ebuflen, 3795 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name); 3796 return NULL; 3797 } 3798 3799 // search system directory 3800 if ((size = GetSystemDirectory(path, pathLen)) > 0) { 3801 if (size >= pathLen) { 3802 return NULL; // truncated 3803 } 3804 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3805 return NULL; // truncated 3806 } 3807 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3808 return result; 3809 } 3810 } 3811 3812 // try Windows directory 3813 if ((size = GetWindowsDirectory(path, pathLen)) > 0) { 3814 if (size >= pathLen) { 3815 return NULL; // truncated 3816 } 3817 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3818 return NULL; // truncated 3819 } 3820 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3821 return result; 3822 } 3823 } 3824 3825 jio_snprintf(ebuf, ebuflen, 3826 "os::win32::load_windows_dll() cannot load %s from system directories.", name); 3827 return NULL; 3828 } 3829 3830 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS) 3831 #define EXIT_TIMEOUT 300000 /* 5 minutes */ 3832 3833 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) { 3834 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect); 3835 return TRUE; 3836 } 3837 3838 int os::win32::exit_process_or_thread(Ept what, int exit_code) { 3839 // Basic approach: 3840 // - Each exiting thread registers its intent to exit and then does so. 3841 // - A thread trying to terminate the process must wait for all 3842 // threads currently exiting to complete their exit. 3843 3844 if (os::win32::has_exit_bug()) { 3845 // The array holds handles of the threads that have started exiting by calling 3846 // _endthreadex(). 3847 // Should be large enough to avoid blocking the exiting thread due to lack of 3848 // a free slot. 3849 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP]; 3850 static int handle_count = 0; 3851 3852 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT; 3853 static CRITICAL_SECTION crit_sect; 3854 static volatile DWORD process_exiting = 0; 3855 int i, j; 3856 DWORD res; 3857 HANDLE hproc, hthr; 3858 3859 // We only attempt to register threads until a process exiting 3860 // thread manages to set the process_exiting flag. Any threads 3861 // that come through here after the process_exiting flag is set 3862 // are unregistered and will be caught in the SuspendThread() 3863 // infinite loop below. 3864 bool registered = false; 3865 3866 // The first thread that reached this point, initializes the critical section. 3867 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) { 3868 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__); 3869 } else if (OrderAccess::load_acquire(&process_exiting) == 0) { 3870 if (what != EPT_THREAD) { 3871 // Atomically set process_exiting before the critical section 3872 // to increase the visibility between racing threads. 3873 Atomic::cmpxchg(GetCurrentThreadId(), &process_exiting, (DWORD)0); 3874 } 3875 EnterCriticalSection(&crit_sect); 3876 3877 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) { 3878 // Remove from the array those handles of the threads that have completed exiting. 3879 for (i = 0, j = 0; i < handle_count; ++i) { 3880 res = WaitForSingleObject(handles[i], 0 /* don't wait */); 3881 if (res == WAIT_TIMEOUT) { 3882 handles[j++] = handles[i]; 3883 } else { 3884 if (res == WAIT_FAILED) { 3885 warning("WaitForSingleObject failed (%u) in %s: %d\n", 3886 GetLastError(), __FILE__, __LINE__); 3887 } 3888 // Don't keep the handle, if we failed waiting for it. 3889 CloseHandle(handles[i]); 3890 } 3891 } 3892 3893 // If there's no free slot in the array of the kept handles, we'll have to 3894 // wait until at least one thread completes exiting. 3895 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) { 3896 // Raise the priority of the oldest exiting thread to increase its chances 3897 // to complete sooner. 3898 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL); 3899 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT); 3900 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) { 3901 i = (res - WAIT_OBJECT_0); 3902 handle_count = MAXIMUM_THREADS_TO_KEEP - 1; 3903 for (; i < handle_count; ++i) { 3904 handles[i] = handles[i + 1]; 3905 } 3906 } else { 3907 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3908 (res == WAIT_FAILED ? "failed" : "timed out"), 3909 GetLastError(), __FILE__, __LINE__); 3910 // Don't keep handles, if we failed waiting for them. 3911 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) { 3912 CloseHandle(handles[i]); 3913 } 3914 handle_count = 0; 3915 } 3916 } 3917 3918 // Store a duplicate of the current thread handle in the array of handles. 3919 hproc = GetCurrentProcess(); 3920 hthr = GetCurrentThread(); 3921 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count], 3922 0, FALSE, DUPLICATE_SAME_ACCESS)) { 3923 warning("DuplicateHandle failed (%u) in %s: %d\n", 3924 GetLastError(), __FILE__, __LINE__); 3925 3926 // We can't register this thread (no more handles) so this thread 3927 // may be racing with a thread that is calling exit(). If the thread 3928 // that is calling exit() has managed to set the process_exiting 3929 // flag, then this thread will be caught in the SuspendThread() 3930 // infinite loop below which closes that race. A small timing 3931 // window remains before the process_exiting flag is set, but it 3932 // is only exposed when we are out of handles. 3933 } else { 3934 ++handle_count; 3935 registered = true; 3936 3937 // The current exiting thread has stored its handle in the array, and now 3938 // should leave the critical section before calling _endthreadex(). 3939 } 3940 3941 } else if (what != EPT_THREAD && handle_count > 0) { 3942 jlong start_time, finish_time, timeout_left; 3943 // Before ending the process, make sure all the threads that had called 3944 // _endthreadex() completed. 3945 3946 // Set the priority level of the current thread to the same value as 3947 // the priority level of exiting threads. 3948 // This is to ensure it will be given a fair chance to execute if 3949 // the timeout expires. 3950 hthr = GetCurrentThread(); 3951 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL); 3952 start_time = os::javaTimeNanos(); 3953 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L); 3954 for (i = 0; ; ) { 3955 int portion_count = handle_count - i; 3956 if (portion_count > MAXIMUM_WAIT_OBJECTS) { 3957 portion_count = MAXIMUM_WAIT_OBJECTS; 3958 } 3959 for (j = 0; j < portion_count; ++j) { 3960 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL); 3961 } 3962 timeout_left = (finish_time - start_time) / 1000000L; 3963 if (timeout_left < 0) { 3964 timeout_left = 0; 3965 } 3966 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left); 3967 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) { 3968 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3969 (res == WAIT_FAILED ? "failed" : "timed out"), 3970 GetLastError(), __FILE__, __LINE__); 3971 // Reset portion_count so we close the remaining 3972 // handles due to this error. 3973 portion_count = handle_count - i; 3974 } 3975 for (j = 0; j < portion_count; ++j) { 3976 CloseHandle(handles[i + j]); 3977 } 3978 if ((i += portion_count) >= handle_count) { 3979 break; 3980 } 3981 start_time = os::javaTimeNanos(); 3982 } 3983 handle_count = 0; 3984 } 3985 3986 LeaveCriticalSection(&crit_sect); 3987 } 3988 3989 if (!registered && 3990 OrderAccess::load_acquire(&process_exiting) != 0 && 3991 process_exiting != GetCurrentThreadId()) { 3992 // Some other thread is about to call exit(), so we don't let 3993 // the current unregistered thread proceed to exit() or _endthreadex() 3994 while (true) { 3995 SuspendThread(GetCurrentThread()); 3996 // Avoid busy-wait loop, if SuspendThread() failed. 3997 Sleep(EXIT_TIMEOUT); 3998 } 3999 } 4000 } 4001 4002 // We are here if either 4003 // - there's no 'race at exit' bug on this OS release; 4004 // - initialization of the critical section failed (unlikely); 4005 // - the current thread has registered itself and left the critical section; 4006 // - the process-exiting thread has raised the flag and left the critical section. 4007 if (what == EPT_THREAD) { 4008 _endthreadex((unsigned)exit_code); 4009 } else if (what == EPT_PROCESS) { 4010 ::exit(exit_code); 4011 } else { 4012 _exit(exit_code); 4013 } 4014 4015 // Should not reach here 4016 return exit_code; 4017 } 4018 4019 #undef EXIT_TIMEOUT 4020 4021 void os::win32::setmode_streams() { 4022 _setmode(_fileno(stdin), _O_BINARY); 4023 _setmode(_fileno(stdout), _O_BINARY); 4024 _setmode(_fileno(stderr), _O_BINARY); 4025 } 4026 4027 4028 bool os::is_debugger_attached() { 4029 return IsDebuggerPresent() ? true : false; 4030 } 4031 4032 4033 void os::wait_for_keypress_at_exit(void) { 4034 if (PauseAtExit) { 4035 fprintf(stderr, "Press any key to continue...\n"); 4036 fgetc(stdin); 4037 } 4038 } 4039 4040 4041 bool os::message_box(const char* title, const char* message) { 4042 int result = MessageBox(NULL, message, title, 4043 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 4044 return result == IDYES; 4045 } 4046 4047 #ifndef PRODUCT 4048 #ifndef _WIN64 4049 // Helpers to check whether NX protection is enabled 4050 int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 4051 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 4052 pex->ExceptionRecord->NumberParameters > 0 && 4053 pex->ExceptionRecord->ExceptionInformation[0] == 4054 EXCEPTION_INFO_EXEC_VIOLATION) { 4055 return EXCEPTION_EXECUTE_HANDLER; 4056 } 4057 return EXCEPTION_CONTINUE_SEARCH; 4058 } 4059 4060 void nx_check_protection() { 4061 // If NX is enabled we'll get an exception calling into code on the stack 4062 char code[] = { (char)0xC3 }; // ret 4063 void *code_ptr = (void *)code; 4064 __try { 4065 __asm call code_ptr 4066 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 4067 tty->print_raw_cr("NX protection detected."); 4068 } 4069 } 4070 #endif // _WIN64 4071 #endif // PRODUCT 4072 4073 // This is called _before_ the global arguments have been parsed 4074 void os::init(void) { 4075 _initial_pid = _getpid(); 4076 4077 init_random(1234567); 4078 4079 win32::initialize_system_info(); 4080 win32::setmode_streams(); 4081 init_page_sizes((size_t) win32::vm_page_size()); 4082 4083 // This may be overridden later when argument processing is done. 4084 FLAG_SET_ERGO(UseLargePagesIndividualAllocation, false); 4085 4086 // Initialize main_process and main_thread 4087 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 4088 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 4089 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 4090 fatal("DuplicateHandle failed\n"); 4091 } 4092 main_thread_id = (int) GetCurrentThreadId(); 4093 4094 // initialize fast thread access - only used for 32-bit 4095 win32::initialize_thread_ptr_offset(); 4096 } 4097 4098 // To install functions for atexit processing 4099 extern "C" { 4100 static void perfMemory_exit_helper() { 4101 perfMemory_exit(); 4102 } 4103 } 4104 4105 static jint initSock(); 4106 4107 // this is called _after_ the global arguments have been parsed 4108 jint os::init_2(void) { 4109 4110 // This could be set any time but all platforms 4111 // have to set it the same so we have to mirror Solaris. 4112 DEBUG_ONLY(os::set_mutex_init_done();) 4113 4114 // Setup Windows Exceptions 4115 4116 #if INCLUDE_AOT 4117 // If AOT is enabled we need to install a vectored exception handler 4118 // in order to forward implicit exceptions from code in AOT 4119 // generated DLLs. This is necessary since these DLLs are not 4120 // registered for structured exceptions like codecache methods are. 4121 if (UseAOT) { 4122 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelVectoredExceptionFilter); 4123 } 4124 #endif 4125 4126 // for debugging float code generation bugs 4127 if (ForceFloatExceptions) { 4128 #ifndef _WIN64 4129 static long fp_control_word = 0; 4130 __asm { fstcw fp_control_word } 4131 // see Intel PPro Manual, Vol. 2, p 7-16 4132 const long precision = 0x20; 4133 const long underflow = 0x10; 4134 const long overflow = 0x08; 4135 const long zero_div = 0x04; 4136 const long denorm = 0x02; 4137 const long invalid = 0x01; 4138 fp_control_word |= invalid; 4139 __asm { fldcw fp_control_word } 4140 #endif 4141 } 4142 4143 // If stack_commit_size is 0, windows will reserve the default size, 4144 // but only commit a small portion of it. 4145 size_t stack_commit_size = align_up(ThreadStackSize*K, os::vm_page_size()); 4146 size_t default_reserve_size = os::win32::default_stack_size(); 4147 size_t actual_reserve_size = stack_commit_size; 4148 if (stack_commit_size < default_reserve_size) { 4149 // If stack_commit_size == 0, we want this too 4150 actual_reserve_size = default_reserve_size; 4151 } 4152 4153 // Check minimum allowable stack size for thread creation and to initialize 4154 // the java system classes, including StackOverflowError - depends on page 4155 // size. Add two 4K pages for compiler2 recursion in main thread. 4156 // Add in 4*BytesPerWord 4K pages to account for VM stack during 4157 // class initialization depending on 32 or 64 bit VM. 4158 size_t min_stack_allowed = 4159 (size_t)(JavaThread::stack_guard_zone_size() + 4160 JavaThread::stack_shadow_zone_size() + 4161 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K); 4162 4163 min_stack_allowed = align_up(min_stack_allowed, os::vm_page_size()); 4164 4165 if (actual_reserve_size < min_stack_allowed) { 4166 tty->print_cr("\nThe Java thread stack size specified is too small. " 4167 "Specify at least %dk", 4168 min_stack_allowed / K); 4169 return JNI_ERR; 4170 } 4171 4172 JavaThread::set_stack_size_at_create(stack_commit_size); 4173 4174 // Calculate theoretical max. size of Threads to guard gainst artifical 4175 // out-of-memory situations, where all available address-space has been 4176 // reserved by thread stacks. 4177 assert(actual_reserve_size != 0, "Must have a stack"); 4178 4179 // Calculate the thread limit when we should start doing Virtual Memory 4180 // banging. Currently when the threads will have used all but 200Mb of space. 4181 // 4182 // TODO: consider performing a similar calculation for commit size instead 4183 // as reserve size, since on a 64-bit platform we'll run into that more 4184 // often than running out of virtual memory space. We can use the 4185 // lower value of the two calculations as the os_thread_limit. 4186 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 4187 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 4188 4189 // at exit methods are called in the reverse order of their registration. 4190 // there is no limit to the number of functions registered. atexit does 4191 // not set errno. 4192 4193 if (PerfAllowAtExitRegistration) { 4194 // only register atexit functions if PerfAllowAtExitRegistration is set. 4195 // atexit functions can be delayed until process exit time, which 4196 // can be problematic for embedded VM situations. Embedded VMs should 4197 // call DestroyJavaVM() to assure that VM resources are released. 4198 4199 // note: perfMemory_exit_helper atexit function may be removed in 4200 // the future if the appropriate cleanup code can be added to the 4201 // VM_Exit VMOperation's doit method. 4202 if (atexit(perfMemory_exit_helper) != 0) { 4203 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 4204 } 4205 } 4206 4207 #ifndef _WIN64 4208 // Print something if NX is enabled (win32 on AMD64) 4209 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 4210 #endif 4211 4212 // initialize thread priority policy 4213 prio_init(); 4214 4215 if (UseNUMA && !ForceNUMA) { 4216 UseNUMA = false; // We don't fully support this yet 4217 } 4218 4219 if (UseNUMAInterleaving) { 4220 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag 4221 bool success = numa_interleaving_init(); 4222 if (!success) UseNUMAInterleaving = false; 4223 } 4224 4225 if (initSock() != JNI_OK) { 4226 return JNI_ERR; 4227 } 4228 4229 SymbolEngine::recalc_search_path(); 4230 4231 // Initialize data for jdk.internal.misc.Signal 4232 if (!ReduceSignalUsage) { 4233 jdk_misc_signal_init(); 4234 } 4235 4236 return JNI_OK; 4237 } 4238 4239 // Mark the polling page as unreadable 4240 void os::make_polling_page_unreadable(void) { 4241 DWORD old_status; 4242 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4243 PAGE_NOACCESS, &old_status)) { 4244 fatal("Could not disable polling page"); 4245 } 4246 } 4247 4248 // Mark the polling page as readable 4249 void os::make_polling_page_readable(void) { 4250 DWORD old_status; 4251 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4252 PAGE_READONLY, &old_status)) { 4253 fatal("Could not enable polling page"); 4254 } 4255 } 4256 4257 // combine the high and low DWORD into a ULONGLONG 4258 static ULONGLONG make_double_word(DWORD high_word, DWORD low_word) { 4259 ULONGLONG value = high_word; 4260 value <<= sizeof(high_word) * 8; 4261 value |= low_word; 4262 return value; 4263 } 4264 4265 // Transfers data from WIN32_FILE_ATTRIBUTE_DATA structure to struct stat 4266 static void file_attribute_data_to_stat(struct stat* sbuf, WIN32_FILE_ATTRIBUTE_DATA file_data) { 4267 ::memset((void*)sbuf, 0, sizeof(struct stat)); 4268 sbuf->st_size = (_off_t)make_double_word(file_data.nFileSizeHigh, file_data.nFileSizeLow); 4269 sbuf->st_mtime = make_double_word(file_data.ftLastWriteTime.dwHighDateTime, 4270 file_data.ftLastWriteTime.dwLowDateTime); 4271 sbuf->st_ctime = make_double_word(file_data.ftCreationTime.dwHighDateTime, 4272 file_data.ftCreationTime.dwLowDateTime); 4273 sbuf->st_atime = make_double_word(file_data.ftLastAccessTime.dwHighDateTime, 4274 file_data.ftLastAccessTime.dwLowDateTime); 4275 if ((file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0) { 4276 sbuf->st_mode |= S_IFDIR; 4277 } else { 4278 sbuf->st_mode |= S_IFREG; 4279 } 4280 } 4281 4282 // The following function is adapted from java.base/windows/native/libjava/canonicalize_md.c 4283 // Creates an UNC path from a single byte path. Return buffer is 4284 // allocated in C heap and needs to be freed by the caller. 4285 // Returns NULL on error. 4286 static wchar_t* create_unc_path(const char* path, errno_t &err) { 4287 wchar_t* wpath = NULL; 4288 size_t converted_chars = 0; 4289 size_t path_len = strlen(path) + 1; // includes the terminating NULL 4290 if (path[0] == '\\' && path[1] == '\\') { 4291 if (path[2] == '?' && path[3] == '\\'){ 4292 // if it already has a \\?\ don't do the prefix 4293 wpath = (wchar_t*)os::malloc(path_len * sizeof(wchar_t), mtInternal); 4294 if (wpath != NULL) { 4295 err = ::mbstowcs_s(&converted_chars, wpath, path_len, path, path_len); 4296 } else { 4297 err = ENOMEM; 4298 } 4299 } else { 4300 // only UNC pathname includes double slashes here 4301 wpath = (wchar_t*)os::malloc((path_len + 7) * sizeof(wchar_t), mtInternal); 4302 if (wpath != NULL) { 4303 ::wcscpy(wpath, L"\\\\?\\UNC\0"); 4304 err = ::mbstowcs_s(&converted_chars, &wpath[7], path_len, path, path_len); 4305 } else { 4306 err = ENOMEM; 4307 } 4308 } 4309 } else { 4310 wpath = (wchar_t*)os::malloc((path_len + 4) * sizeof(wchar_t), mtInternal); 4311 if (wpath != NULL) { 4312 ::wcscpy(wpath, L"\\\\?\\\0"); 4313 err = ::mbstowcs_s(&converted_chars, &wpath[4], path_len, path, path_len); 4314 } else { 4315 err = ENOMEM; 4316 } 4317 } 4318 return wpath; 4319 } 4320 4321 static void destroy_unc_path(wchar_t* wpath) { 4322 os::free(wpath); 4323 } 4324 4325 int os::stat(const char *path, struct stat *sbuf) { 4326 char* pathbuf = (char*)os::strdup(path, mtInternal); 4327 if (pathbuf == NULL) { 4328 errno = ENOMEM; 4329 return -1; 4330 } 4331 os::native_path(pathbuf); 4332 int ret; 4333 WIN32_FILE_ATTRIBUTE_DATA file_data; 4334 // Not using stat() to avoid the problem described in JDK-6539723 4335 if (strlen(path) < MAX_PATH) { 4336 BOOL bret = ::GetFileAttributesExA(pathbuf, GetFileExInfoStandard, &file_data); 4337 if (!bret) { 4338 errno = ::GetLastError(); 4339 ret = -1; 4340 } 4341 else { 4342 file_attribute_data_to_stat(sbuf, file_data); 4343 ret = 0; 4344 } 4345 } else { 4346 errno_t err = ERROR_SUCCESS; 4347 wchar_t* wpath = create_unc_path(pathbuf, err); 4348 if (err != ERROR_SUCCESS) { 4349 if (wpath != NULL) { 4350 destroy_unc_path(wpath); 4351 } 4352 os::free(pathbuf); 4353 errno = err; 4354 return -1; 4355 } 4356 BOOL bret = ::GetFileAttributesExW(wpath, GetFileExInfoStandard, &file_data); 4357 if (!bret) { 4358 errno = ::GetLastError(); 4359 ret = -1; 4360 } else { 4361 file_attribute_data_to_stat(sbuf, file_data); 4362 ret = 0; 4363 } 4364 destroy_unc_path(wpath); 4365 } 4366 os::free(pathbuf); 4367 return ret; 4368 } 4369 4370 static HANDLE create_read_only_file_handle(const char* file) { 4371 if (file == NULL) { 4372 return INVALID_HANDLE_VALUE; 4373 } 4374 4375 char* nativepath = (char*)os::strdup(file, mtInternal); 4376 if (nativepath == NULL) { 4377 errno = ENOMEM; 4378 return INVALID_HANDLE_VALUE; 4379 } 4380 os::native_path(nativepath); 4381 4382 size_t len = strlen(nativepath); 4383 HANDLE handle = INVALID_HANDLE_VALUE; 4384 4385 if (len < MAX_PATH) { 4386 handle = ::CreateFile(nativepath, 0, FILE_SHARE_READ, 4387 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4388 } else { 4389 errno_t err = ERROR_SUCCESS; 4390 wchar_t* wfile = create_unc_path(nativepath, err); 4391 if (err != ERROR_SUCCESS) { 4392 if (wfile != NULL) { 4393 destroy_unc_path(wfile); 4394 } 4395 os::free(nativepath); 4396 return INVALID_HANDLE_VALUE; 4397 } 4398 handle = ::CreateFileW(wfile, 0, FILE_SHARE_READ, 4399 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4400 destroy_unc_path(wfile); 4401 } 4402 4403 os::free(nativepath); 4404 return handle; 4405 } 4406 4407 bool os::same_files(const char* file1, const char* file2) { 4408 4409 if (file1 == NULL && file2 == NULL) { 4410 return true; 4411 } 4412 4413 if (file1 == NULL || file2 == NULL) { 4414 return false; 4415 } 4416 4417 if (strcmp(file1, file2) == 0) { 4418 return true; 4419 } 4420 4421 HANDLE handle1 = create_read_only_file_handle(file1); 4422 HANDLE handle2 = create_read_only_file_handle(file2); 4423 bool result = false; 4424 4425 // if we could open both paths... 4426 if (handle1 != INVALID_HANDLE_VALUE && handle2 != INVALID_HANDLE_VALUE) { 4427 BY_HANDLE_FILE_INFORMATION fileInfo1; 4428 BY_HANDLE_FILE_INFORMATION fileInfo2; 4429 if (::GetFileInformationByHandle(handle1, &fileInfo1) && 4430 ::GetFileInformationByHandle(handle2, &fileInfo2)) { 4431 // the paths are the same if they refer to the same file (fileindex) on the same volume (volume serial number) 4432 if (fileInfo1.dwVolumeSerialNumber == fileInfo2.dwVolumeSerialNumber && 4433 fileInfo1.nFileIndexHigh == fileInfo2.nFileIndexHigh && 4434 fileInfo1.nFileIndexLow == fileInfo2.nFileIndexLow) { 4435 result = true; 4436 } 4437 } 4438 } 4439 4440 //free the handles 4441 if (handle1 != INVALID_HANDLE_VALUE) { 4442 ::CloseHandle(handle1); 4443 } 4444 4445 if (handle2 != INVALID_HANDLE_VALUE) { 4446 ::CloseHandle(handle2); 4447 } 4448 4449 return result; 4450 } 4451 4452 4453 #define FT2INT64(ft) \ 4454 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 4455 4456 4457 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4458 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4459 // of a thread. 4460 // 4461 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4462 // the fast estimate available on the platform. 4463 4464 // current_thread_cpu_time() is not optimized for Windows yet 4465 jlong os::current_thread_cpu_time() { 4466 // return user + sys since the cost is the same 4467 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 4468 } 4469 4470 jlong os::thread_cpu_time(Thread* thread) { 4471 // consistent with what current_thread_cpu_time() returns. 4472 return os::thread_cpu_time(thread, true /* user+sys */); 4473 } 4474 4475 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4476 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4477 } 4478 4479 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 4480 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 4481 // If this function changes, os::is_thread_cpu_time_supported() should too 4482 FILETIME CreationTime; 4483 FILETIME ExitTime; 4484 FILETIME KernelTime; 4485 FILETIME UserTime; 4486 4487 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime, 4488 &ExitTime, &KernelTime, &UserTime) == 0) { 4489 return -1; 4490 } else if (user_sys_cpu_time) { 4491 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 4492 } else { 4493 return FT2INT64(UserTime) * 100; 4494 } 4495 } 4496 4497 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4498 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4499 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4500 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4501 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4502 } 4503 4504 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4505 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4506 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4507 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4508 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4509 } 4510 4511 bool os::is_thread_cpu_time_supported() { 4512 // see os::thread_cpu_time 4513 FILETIME CreationTime; 4514 FILETIME ExitTime; 4515 FILETIME KernelTime; 4516 FILETIME UserTime; 4517 4518 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime, 4519 &KernelTime, &UserTime) == 0) { 4520 return false; 4521 } else { 4522 return true; 4523 } 4524 } 4525 4526 // Windows does't provide a loadavg primitive so this is stubbed out for now. 4527 // It does have primitives (PDH API) to get CPU usage and run queue length. 4528 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 4529 // If we wanted to implement loadavg on Windows, we have a few options: 4530 // 4531 // a) Query CPU usage and run queue length and "fake" an answer by 4532 // returning the CPU usage if it's under 100%, and the run queue 4533 // length otherwise. It turns out that querying is pretty slow 4534 // on Windows, on the order of 200 microseconds on a fast machine. 4535 // Note that on the Windows the CPU usage value is the % usage 4536 // since the last time the API was called (and the first call 4537 // returns 100%), so we'd have to deal with that as well. 4538 // 4539 // b) Sample the "fake" answer using a sampling thread and store 4540 // the answer in a global variable. The call to loadavg would 4541 // just return the value of the global, avoiding the slow query. 4542 // 4543 // c) Sample a better answer using exponential decay to smooth the 4544 // value. This is basically the algorithm used by UNIX kernels. 4545 // 4546 // Note that sampling thread starvation could affect both (b) and (c). 4547 int os::loadavg(double loadavg[], int nelem) { 4548 return -1; 4549 } 4550 4551 4552 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 4553 bool os::dont_yield() { 4554 return DontYieldALot; 4555 } 4556 4557 // This method is a slightly reworked copy of JDK's sysOpen 4558 // from src/windows/hpi/src/sys_api_md.c 4559 4560 int os::open(const char *path, int oflag, int mode) { 4561 char* pathbuf = (char*)os::strdup(path, mtInternal); 4562 if (pathbuf == NULL) { 4563 errno = ENOMEM; 4564 return -1; 4565 } 4566 os::native_path(pathbuf); 4567 int ret; 4568 if (strlen(path) < MAX_PATH) { 4569 ret = ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 4570 } else { 4571 errno_t err = ERROR_SUCCESS; 4572 wchar_t* wpath = create_unc_path(pathbuf, err); 4573 if (err != ERROR_SUCCESS) { 4574 if (wpath != NULL) { 4575 destroy_unc_path(wpath); 4576 } 4577 os::free(pathbuf); 4578 errno = err; 4579 return -1; 4580 } 4581 ret = ::_wopen(wpath, oflag | O_BINARY | O_NOINHERIT, mode); 4582 if (ret == -1) { 4583 errno = ::GetLastError(); 4584 } 4585 destroy_unc_path(wpath); 4586 } 4587 os::free(pathbuf); 4588 return ret; 4589 } 4590 4591 FILE* os::open(int fd, const char* mode) { 4592 return ::_fdopen(fd, mode); 4593 } 4594 4595 // Is a (classpath) directory empty? 4596 bool os::dir_is_empty(const char* path) { 4597 char* search_path = (char*)os::malloc(strlen(path) + 3, mtInternal); 4598 if (search_path == NULL) { 4599 errno = ENOMEM; 4600 return false; 4601 } 4602 strcpy(search_path, path); 4603 os::native_path(search_path); 4604 // Append "*", or possibly "\\*", to path 4605 if (search_path[1] == ':' && 4606 (search_path[2] == '\0' || 4607 (search_path[2] == '\\' && search_path[3] == '\0'))) { 4608 // No '\\' needed for cases like "Z:" or "Z:\" 4609 strcat(search_path, "*"); 4610 } 4611 else { 4612 strcat(search_path, "\\*"); 4613 } 4614 errno_t err = ERROR_SUCCESS; 4615 wchar_t* wpath = create_unc_path(search_path, err); 4616 if (err != ERROR_SUCCESS) { 4617 if (wpath != NULL) { 4618 destroy_unc_path(wpath); 4619 } 4620 os::free(search_path); 4621 errno = err; 4622 return false; 4623 } 4624 WIN32_FIND_DATAW fd; 4625 HANDLE f = ::FindFirstFileW(wpath, &fd); 4626 destroy_unc_path(wpath); 4627 bool is_empty = true; 4628 if (f != INVALID_HANDLE_VALUE) { 4629 while (is_empty && ::FindNextFileW(f, &fd)) { 4630 // An empty directory contains only the current directory file 4631 // and the previous directory file. 4632 if ((wcscmp(fd.cFileName, L".") != 0) && 4633 (wcscmp(fd.cFileName, L"..") != 0)) { 4634 is_empty = false; 4635 } 4636 } 4637 FindClose(f); 4638 } 4639 os::free(search_path); 4640 return is_empty; 4641 } 4642 4643 // create binary file, rewriting existing file if required 4644 int os::create_binary_file(const char* path, bool rewrite_existing) { 4645 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 4646 if (!rewrite_existing) { 4647 oflags |= _O_EXCL; 4648 } 4649 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 4650 } 4651 4652 // return current position of file pointer 4653 jlong os::current_file_offset(int fd) { 4654 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 4655 } 4656 4657 // move file pointer to the specified offset 4658 jlong os::seek_to_file_offset(int fd, jlong offset) { 4659 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 4660 } 4661 4662 4663 jlong os::lseek(int fd, jlong offset, int whence) { 4664 return (jlong) ::_lseeki64(fd, offset, whence); 4665 } 4666 4667 ssize_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 4668 OVERLAPPED ov; 4669 DWORD nread; 4670 BOOL result; 4671 4672 ZeroMemory(&ov, sizeof(ov)); 4673 ov.Offset = (DWORD)offset; 4674 ov.OffsetHigh = (DWORD)(offset >> 32); 4675 4676 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4677 4678 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov); 4679 4680 return result ? nread : 0; 4681 } 4682 4683 4684 // This method is a slightly reworked copy of JDK's sysNativePath 4685 // from src/windows/hpi/src/path_md.c 4686 4687 // Convert a pathname to native format. On win32, this involves forcing all 4688 // separators to be '\\' rather than '/' (both are legal inputs, but Win95 4689 // sometimes rejects '/') and removing redundant separators. The input path is 4690 // assumed to have been converted into the character encoding used by the local 4691 // system. Because this might be a double-byte encoding, care is taken to 4692 // treat double-byte lead characters correctly. 4693 // 4694 // This procedure modifies the given path in place, as the result is never 4695 // longer than the original. There is no error return; this operation always 4696 // succeeds. 4697 char * os::native_path(char *path) { 4698 char *src = path, *dst = path, *end = path; 4699 char *colon = NULL; // If a drive specifier is found, this will 4700 // point to the colon following the drive letter 4701 4702 // Assumption: '/', '\\', ':', and drive letters are never lead bytes 4703 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\')) 4704 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte"); 4705 4706 // Check for leading separators 4707 #define isfilesep(c) ((c) == '/' || (c) == '\\') 4708 while (isfilesep(*src)) { 4709 src++; 4710 } 4711 4712 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 4713 // Remove leading separators if followed by drive specifier. This 4714 // hack is necessary to support file URLs containing drive 4715 // specifiers (e.g., "file://c:/path"). As a side effect, 4716 // "/c:/path" can be used as an alternative to "c:/path". 4717 *dst++ = *src++; 4718 colon = dst; 4719 *dst++ = ':'; 4720 src++; 4721 } else { 4722 src = path; 4723 if (isfilesep(src[0]) && isfilesep(src[1])) { 4724 // UNC pathname: Retain first separator; leave src pointed at 4725 // second separator so that further separators will be collapsed 4726 // into the second separator. The result will be a pathname 4727 // beginning with "\\\\" followed (most likely) by a host name. 4728 src = dst = path + 1; 4729 path[0] = '\\'; // Force first separator to '\\' 4730 } 4731 } 4732 4733 end = dst; 4734 4735 // Remove redundant separators from remainder of path, forcing all 4736 // separators to be '\\' rather than '/'. Also, single byte space 4737 // characters are removed from the end of the path because those 4738 // are not legal ending characters on this operating system. 4739 // 4740 while (*src != '\0') { 4741 if (isfilesep(*src)) { 4742 *dst++ = '\\'; src++; 4743 while (isfilesep(*src)) src++; 4744 if (*src == '\0') { 4745 // Check for trailing separator 4746 end = dst; 4747 if (colon == dst - 2) break; // "z:\\" 4748 if (dst == path + 1) break; // "\\" 4749 if (dst == path + 2 && isfilesep(path[0])) { 4750 // "\\\\" is not collapsed to "\\" because "\\\\" marks the 4751 // beginning of a UNC pathname. Even though it is not, by 4752 // itself, a valid UNC pathname, we leave it as is in order 4753 // to be consistent with the path canonicalizer as well 4754 // as the win32 APIs, which treat this case as an invalid 4755 // UNC pathname rather than as an alias for the root 4756 // directory of the current drive. 4757 break; 4758 } 4759 end = --dst; // Path does not denote a root directory, so 4760 // remove trailing separator 4761 break; 4762 } 4763 end = dst; 4764 } else { 4765 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character 4766 *dst++ = *src++; 4767 if (*src) *dst++ = *src++; 4768 end = dst; 4769 } else { // Copy a single-byte character 4770 char c = *src++; 4771 *dst++ = c; 4772 // Space is not a legal ending character 4773 if (c != ' ') end = dst; 4774 } 4775 } 4776 } 4777 4778 *end = '\0'; 4779 4780 // For "z:", add "." to work around a bug in the C runtime library 4781 if (colon == dst - 1) { 4782 path[2] = '.'; 4783 path[3] = '\0'; 4784 } 4785 4786 return path; 4787 } 4788 4789 // This code is a copy of JDK's sysSetLength 4790 // from src/windows/hpi/src/sys_api_md.c 4791 4792 int os::ftruncate(int fd, jlong length) { 4793 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4794 long high = (long)(length >> 32); 4795 DWORD ret; 4796 4797 if (h == (HANDLE)(-1)) { 4798 return -1; 4799 } 4800 4801 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 4802 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 4803 return -1; 4804 } 4805 4806 if (::SetEndOfFile(h) == FALSE) { 4807 return -1; 4808 } 4809 4810 return 0; 4811 } 4812 4813 int os::get_fileno(FILE* fp) { 4814 return _fileno(fp); 4815 } 4816 4817 // This code is a copy of JDK's sysSync 4818 // from src/windows/hpi/src/sys_api_md.c 4819 // except for the legacy workaround for a bug in Win 98 4820 4821 int os::fsync(int fd) { 4822 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 4823 4824 if ((!::FlushFileBuffers(handle)) && 4825 (GetLastError() != ERROR_ACCESS_DENIED)) { 4826 // from winerror.h 4827 return -1; 4828 } 4829 return 0; 4830 } 4831 4832 static int nonSeekAvailable(int, long *); 4833 static int stdinAvailable(int, long *); 4834 4835 // This code is a copy of JDK's sysAvailable 4836 // from src/windows/hpi/src/sys_api_md.c 4837 4838 int os::available(int fd, jlong *bytes) { 4839 jlong cur, end; 4840 struct _stati64 stbuf64; 4841 4842 if (::_fstati64(fd, &stbuf64) >= 0) { 4843 int mode = stbuf64.st_mode; 4844 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 4845 int ret; 4846 long lpbytes; 4847 if (fd == 0) { 4848 ret = stdinAvailable(fd, &lpbytes); 4849 } else { 4850 ret = nonSeekAvailable(fd, &lpbytes); 4851 } 4852 (*bytes) = (jlong)(lpbytes); 4853 return ret; 4854 } 4855 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 4856 return FALSE; 4857 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 4858 return FALSE; 4859 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 4860 return FALSE; 4861 } 4862 *bytes = end - cur; 4863 return TRUE; 4864 } else { 4865 return FALSE; 4866 } 4867 } 4868 4869 void os::flockfile(FILE* fp) { 4870 _lock_file(fp); 4871 } 4872 4873 void os::funlockfile(FILE* fp) { 4874 _unlock_file(fp); 4875 } 4876 4877 // This code is a copy of JDK's nonSeekAvailable 4878 // from src/windows/hpi/src/sys_api_md.c 4879 4880 static int nonSeekAvailable(int fd, long *pbytes) { 4881 // This is used for available on non-seekable devices 4882 // (like both named and anonymous pipes, such as pipes 4883 // connected to an exec'd process). 4884 // Standard Input is a special case. 4885 HANDLE han; 4886 4887 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 4888 return FALSE; 4889 } 4890 4891 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 4892 // PeekNamedPipe fails when at EOF. In that case we 4893 // simply make *pbytes = 0 which is consistent with the 4894 // behavior we get on Solaris when an fd is at EOF. 4895 // The only alternative is to raise an Exception, 4896 // which isn't really warranted. 4897 // 4898 if (::GetLastError() != ERROR_BROKEN_PIPE) { 4899 return FALSE; 4900 } 4901 *pbytes = 0; 4902 } 4903 return TRUE; 4904 } 4905 4906 #define MAX_INPUT_EVENTS 2000 4907 4908 // This code is a copy of JDK's stdinAvailable 4909 // from src/windows/hpi/src/sys_api_md.c 4910 4911 static int stdinAvailable(int fd, long *pbytes) { 4912 HANDLE han; 4913 DWORD numEventsRead = 0; // Number of events read from buffer 4914 DWORD numEvents = 0; // Number of events in buffer 4915 DWORD i = 0; // Loop index 4916 DWORD curLength = 0; // Position marker 4917 DWORD actualLength = 0; // Number of bytes readable 4918 BOOL error = FALSE; // Error holder 4919 INPUT_RECORD *lpBuffer; // Pointer to records of input events 4920 4921 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4922 return FALSE; 4923 } 4924 4925 // Construct an array of input records in the console buffer 4926 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4927 if (error == 0) { 4928 return nonSeekAvailable(fd, pbytes); 4929 } 4930 4931 // lpBuffer must fit into 64K or else PeekConsoleInput fails 4932 if (numEvents > MAX_INPUT_EVENTS) { 4933 numEvents = MAX_INPUT_EVENTS; 4934 } 4935 4936 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal); 4937 if (lpBuffer == NULL) { 4938 return FALSE; 4939 } 4940 4941 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4942 if (error == 0) { 4943 os::free(lpBuffer); 4944 return FALSE; 4945 } 4946 4947 // Examine input records for the number of bytes available 4948 for (i=0; i<numEvents; i++) { 4949 if (lpBuffer[i].EventType == KEY_EVENT) { 4950 4951 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4952 &(lpBuffer[i].Event); 4953 if (keyRecord->bKeyDown == TRUE) { 4954 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4955 curLength++; 4956 if (*keyPressed == '\r') { 4957 actualLength = curLength; 4958 } 4959 } 4960 } 4961 } 4962 4963 if (lpBuffer != NULL) { 4964 os::free(lpBuffer); 4965 } 4966 4967 *pbytes = (long) actualLength; 4968 return TRUE; 4969 } 4970 4971 // Map a block of memory. 4972 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4973 char *addr, size_t bytes, bool read_only, 4974 bool allow_exec) { 4975 HANDLE hFile; 4976 char* base; 4977 4978 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4979 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4980 if (hFile == NULL) { 4981 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError()); 4982 return NULL; 4983 } 4984 4985 if (allow_exec) { 4986 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4987 // unless it comes from a PE image (which the shared archive is not.) 4988 // Even VirtualProtect refuses to give execute access to mapped memory 4989 // that was not previously executable. 4990 // 4991 // Instead, stick the executable region in anonymous memory. Yuck. 4992 // Penalty is that ~4 pages will not be shareable - in the future 4993 // we might consider DLLizing the shared archive with a proper PE 4994 // header so that mapping executable + sharing is possible. 4995 4996 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4997 PAGE_READWRITE); 4998 if (base == NULL) { 4999 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError()); 5000 CloseHandle(hFile); 5001 return NULL; 5002 } 5003 5004 // Record virtual memory allocation 5005 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC); 5006 5007 DWORD bytes_read; 5008 OVERLAPPED overlapped; 5009 overlapped.Offset = (DWORD)file_offset; 5010 overlapped.OffsetHigh = 0; 5011 overlapped.hEvent = NULL; 5012 // ReadFile guarantees that if the return value is true, the requested 5013 // number of bytes were read before returning. 5014 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 5015 if (!res) { 5016 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError()); 5017 release_memory(base, bytes); 5018 CloseHandle(hFile); 5019 return NULL; 5020 } 5021 } else { 5022 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 5023 NULL /* file_name */); 5024 if (hMap == NULL) { 5025 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError()); 5026 CloseHandle(hFile); 5027 return NULL; 5028 } 5029 5030 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 5031 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 5032 (DWORD)bytes, addr); 5033 if (base == NULL) { 5034 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError()); 5035 CloseHandle(hMap); 5036 CloseHandle(hFile); 5037 return NULL; 5038 } 5039 5040 if (CloseHandle(hMap) == 0) { 5041 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError()); 5042 CloseHandle(hFile); 5043 return base; 5044 } 5045 } 5046 5047 if (allow_exec) { 5048 DWORD old_protect; 5049 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 5050 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 5051 5052 if (!res) { 5053 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError()); 5054 // Don't consider this a hard error, on IA32 even if the 5055 // VirtualProtect fails, we should still be able to execute 5056 CloseHandle(hFile); 5057 return base; 5058 } 5059 } 5060 5061 if (CloseHandle(hFile) == 0) { 5062 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError()); 5063 return base; 5064 } 5065 5066 return base; 5067 } 5068 5069 5070 // Remap a block of memory. 5071 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 5072 char *addr, size_t bytes, bool read_only, 5073 bool allow_exec) { 5074 // This OS does not allow existing memory maps to be remapped so we 5075 // would have to unmap the memory before we remap it. 5076 5077 // Because there is a small window between unmapping memory and mapping 5078 // it in again with different protections, CDS archives are mapped RW 5079 // on windows, so this function isn't called. 5080 ShouldNotReachHere(); 5081 return NULL; 5082 } 5083 5084 5085 // Unmap a block of memory. 5086 // Returns true=success, otherwise false. 5087 5088 bool os::pd_unmap_memory(char* addr, size_t bytes) { 5089 MEMORY_BASIC_INFORMATION mem_info; 5090 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) { 5091 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError()); 5092 return false; 5093 } 5094 5095 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx. 5096 // Instead, executable region was allocated using VirtualAlloc(). See 5097 // pd_map_memory() above. 5098 // 5099 // The following flags should match the 'exec_access' flages used for 5100 // VirtualProtect() in pd_map_memory(). 5101 if (mem_info.Protect == PAGE_EXECUTE_READ || 5102 mem_info.Protect == PAGE_EXECUTE_READWRITE) { 5103 return pd_release_memory(addr, bytes); 5104 } 5105 5106 BOOL result = UnmapViewOfFile(addr); 5107 if (result == 0) { 5108 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError()); 5109 return false; 5110 } 5111 return true; 5112 } 5113 5114 void os::pause() { 5115 char filename[MAX_PATH]; 5116 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 5117 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 5118 } else { 5119 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 5120 } 5121 5122 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 5123 if (fd != -1) { 5124 struct stat buf; 5125 ::close(fd); 5126 while (::stat(filename, &buf) == 0) { 5127 Sleep(100); 5128 } 5129 } else { 5130 jio_fprintf(stderr, 5131 "Could not open pause file '%s', continuing immediately.\n", filename); 5132 } 5133 } 5134 5135 Thread* os::ThreadCrashProtection::_protected_thread = NULL; 5136 os::ThreadCrashProtection* os::ThreadCrashProtection::_crash_protection = NULL; 5137 volatile intptr_t os::ThreadCrashProtection::_crash_mux = 0; 5138 5139 os::ThreadCrashProtection::ThreadCrashProtection() { 5140 } 5141 5142 // See the caveats for this class in os_windows.hpp 5143 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back 5144 // into this method and returns false. If no OS EXCEPTION was raised, returns 5145 // true. 5146 // The callback is supposed to provide the method that should be protected. 5147 // 5148 bool os::ThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 5149 5150 Thread::muxAcquire(&_crash_mux, "CrashProtection"); 5151 5152 _protected_thread = Thread::current_or_null(); 5153 assert(_protected_thread != NULL, "Cannot crash protect a NULL thread"); 5154 5155 bool success = true; 5156 __try { 5157 _crash_protection = this; 5158 cb.call(); 5159 } __except(EXCEPTION_EXECUTE_HANDLER) { 5160 // only for protection, nothing to do 5161 success = false; 5162 } 5163 _crash_protection = NULL; 5164 _protected_thread = NULL; 5165 Thread::muxRelease(&_crash_mux); 5166 return success; 5167 } 5168 5169 // An Event wraps a win32 "CreateEvent" kernel handle. 5170 // 5171 // We have a number of choices regarding "CreateEvent" win32 handle leakage: 5172 // 5173 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 5174 // field, and call CloseHandle() on the win32 event handle. Unpark() would 5175 // need to be modified to tolerate finding a NULL (invalid) win32 event handle. 5176 // In addition, an unpark() operation might fetch the handle field, but the 5177 // event could recycle between the fetch and the SetEvent() operation. 5178 // SetEvent() would either fail because the handle was invalid, or inadvertently work, 5179 // as the win32 handle value had been recycled. In an ideal world calling SetEvent() 5180 // on an stale but recycled handle would be harmless, but in practice this might 5181 // confuse other non-Sun code, so it's not a viable approach. 5182 // 5183 // 2: Once a win32 event handle is associated with an Event, it remains associated 5184 // with the Event. The event handle is never closed. This could be construed 5185 // as handle leakage, but only up to the maximum # of threads that have been extant 5186 // at any one time. This shouldn't be an issue, as windows platforms typically 5187 // permit a process to have hundreds of thousands of open handles. 5188 // 5189 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 5190 // and release unused handles. 5191 // 5192 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 5193 // It's not clear, however, that we wouldn't be trading one type of leak for another. 5194 // 5195 // 5. Use an RCU-like mechanism (Read-Copy Update). 5196 // Or perhaps something similar to Maged Michael's "Hazard pointers". 5197 // 5198 // We use (2). 5199 // 5200 // TODO-FIXME: 5201 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 5202 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 5203 // to recover from (or at least detect) the dreaded Windows 841176 bug. 5204 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 5205 // into a single win32 CreateEvent() handle. 5206 // 5207 // Assumption: 5208 // Only one parker can exist on an event, which is why we allocate 5209 // them per-thread. Multiple unparkers can coexist. 5210 // 5211 // _Event transitions in park() 5212 // -1 => -1 : illegal 5213 // 1 => 0 : pass - return immediately 5214 // 0 => -1 : block; then set _Event to 0 before returning 5215 // 5216 // _Event transitions in unpark() 5217 // 0 => 1 : just return 5218 // 1 => 1 : just return 5219 // -1 => either 0 or 1; must signal target thread 5220 // That is, we can safely transition _Event from -1 to either 5221 // 0 or 1. 5222 // 5223 // _Event serves as a restricted-range semaphore. 5224 // -1 : thread is blocked, i.e. there is a waiter 5225 // 0 : neutral: thread is running or ready, 5226 // could have been signaled after a wait started 5227 // 1 : signaled - thread is running or ready 5228 // 5229 // Another possible encoding of _Event would be with 5230 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5231 // 5232 5233 int os::PlatformEvent::park(jlong Millis) { 5234 // Transitions for _Event: 5235 // -1 => -1 : illegal 5236 // 1 => 0 : pass - return immediately 5237 // 0 => -1 : block; then set _Event to 0 before returning 5238 5239 guarantee(_ParkHandle != NULL , "Invariant"); 5240 guarantee(Millis > 0 , "Invariant"); 5241 5242 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 5243 // the initial park() operation. 5244 // Consider: use atomic decrement instead of CAS-loop 5245 5246 int v; 5247 for (;;) { 5248 v = _Event; 5249 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5250 } 5251 guarantee((v == 0) || (v == 1), "invariant"); 5252 if (v != 0) return OS_OK; 5253 5254 // Do this the hard way by blocking ... 5255 // TODO: consider a brief spin here, gated on the success of recent 5256 // spin attempts by this thread. 5257 // 5258 // We decompose long timeouts into series of shorter timed waits. 5259 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 5260 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 5261 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 5262 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 5263 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 5264 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 5265 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 5266 // for the already waited time. This policy does not admit any new outcomes. 5267 // In the future, however, we might want to track the accumulated wait time and 5268 // adjust Millis accordingly if we encounter a spurious wakeup. 5269 5270 const int MAXTIMEOUT = 0x10000000; 5271 DWORD rv = WAIT_TIMEOUT; 5272 while (_Event < 0 && Millis > 0) { 5273 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT) 5274 if (Millis > MAXTIMEOUT) { 5275 prd = MAXTIMEOUT; 5276 } 5277 rv = ::WaitForSingleObject(_ParkHandle, prd); 5278 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed"); 5279 if (rv == WAIT_TIMEOUT) { 5280 Millis -= prd; 5281 } 5282 } 5283 v = _Event; 5284 _Event = 0; 5285 // see comment at end of os::PlatformEvent::park() below: 5286 OrderAccess::fence(); 5287 // If we encounter a nearly simultanous timeout expiry and unpark() 5288 // we return OS_OK indicating we awoke via unpark(). 5289 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 5290 return (v >= 0) ? OS_OK : OS_TIMEOUT; 5291 } 5292 5293 void os::PlatformEvent::park() { 5294 // Transitions for _Event: 5295 // -1 => -1 : illegal 5296 // 1 => 0 : pass - return immediately 5297 // 0 => -1 : block; then set _Event to 0 before returning 5298 5299 guarantee(_ParkHandle != NULL, "Invariant"); 5300 // Invariant: Only the thread associated with the Event/PlatformEvent 5301 // may call park(). 5302 // Consider: use atomic decrement instead of CAS-loop 5303 int v; 5304 for (;;) { 5305 v = _Event; 5306 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5307 } 5308 guarantee((v == 0) || (v == 1), "invariant"); 5309 if (v != 0) return; 5310 5311 // Do this the hard way by blocking ... 5312 // TODO: consider a brief spin here, gated on the success of recent 5313 // spin attempts by this thread. 5314 while (_Event < 0) { 5315 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE); 5316 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed"); 5317 } 5318 5319 // Usually we'll find _Event == 0 at this point, but as 5320 // an optional optimization we clear it, just in case can 5321 // multiple unpark() operations drove _Event up to 1. 5322 _Event = 0; 5323 OrderAccess::fence(); 5324 guarantee(_Event >= 0, "invariant"); 5325 } 5326 5327 void os::PlatformEvent::unpark() { 5328 guarantee(_ParkHandle != NULL, "Invariant"); 5329 5330 // Transitions for _Event: 5331 // 0 => 1 : just return 5332 // 1 => 1 : just return 5333 // -1 => either 0 or 1; must signal target thread 5334 // That is, we can safely transition _Event from -1 to either 5335 // 0 or 1. 5336 // See also: "Semaphores in Plan 9" by Mullender & Cox 5337 // 5338 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5339 // that it will take two back-to-back park() calls for the owning 5340 // thread to block. This has the benefit of forcing a spurious return 5341 // from the first park() call after an unpark() call which will help 5342 // shake out uses of park() and unpark() without condition variables. 5343 5344 if (Atomic::xchg(1, &_Event) >= 0) return; 5345 5346 ::SetEvent(_ParkHandle); 5347 } 5348 5349 5350 // JSR166 5351 // ------------------------------------------------------- 5352 5353 // The Windows implementation of Park is very straightforward: Basic 5354 // operations on Win32 Events turn out to have the right semantics to 5355 // use them directly. We opportunistically resuse the event inherited 5356 // from Monitor. 5357 5358 void Parker::park(bool isAbsolute, jlong time) { 5359 guarantee(_ParkEvent != NULL, "invariant"); 5360 // First, demultiplex/decode time arguments 5361 if (time < 0) { // don't wait 5362 return; 5363 } else if (time == 0 && !isAbsolute) { 5364 time = INFINITE; 5365 } else if (isAbsolute) { 5366 time -= os::javaTimeMillis(); // convert to relative time 5367 if (time <= 0) { // already elapsed 5368 return; 5369 } 5370 } else { // relative 5371 time /= 1000000; // Must coarsen from nanos to millis 5372 if (time == 0) { // Wait for the minimal time unit if zero 5373 time = 1; 5374 } 5375 } 5376 5377 JavaThread* thread = JavaThread::current(); 5378 5379 // Don't wait if interrupted or already triggered 5380 if (Thread::is_interrupted(thread, false) || 5381 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 5382 ResetEvent(_ParkEvent); 5383 return; 5384 } else { 5385 ThreadBlockInVM tbivm(thread); 5386 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5387 thread->set_suspend_equivalent(); 5388 5389 WaitForSingleObject(_ParkEvent, time); 5390 ResetEvent(_ParkEvent); 5391 5392 // If externally suspended while waiting, re-suspend 5393 if (thread->handle_special_suspend_equivalent_condition()) { 5394 thread->java_suspend_self(); 5395 } 5396 } 5397 } 5398 5399 void Parker::unpark() { 5400 guarantee(_ParkEvent != NULL, "invariant"); 5401 SetEvent(_ParkEvent); 5402 } 5403 5404 // Platform Monitor implementation 5405 5406 // Must already be locked 5407 int os::PlatformMonitor::wait(jlong millis) { 5408 assert(millis >= 0, "negative timeout"); 5409 int ret = OS_TIMEOUT; 5410 int status = SleepConditionVariableCS(&_cond, &_mutex, 5411 millis == 0 ? INFINITE : millis); 5412 if (status != 0) { 5413 ret = OS_OK; 5414 } 5415 #ifndef PRODUCT 5416 else { 5417 DWORD err = GetLastError(); 5418 assert(err == ERROR_TIMEOUT, "SleepConditionVariableCS: %ld:", err); 5419 } 5420 #endif 5421 return ret; 5422 } 5423 5424 // Run the specified command in a separate process. Return its exit value, 5425 // or -1 on failure (e.g. can't create a new process). 5426 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) { 5427 STARTUPINFO si; 5428 PROCESS_INFORMATION pi; 5429 DWORD exit_code; 5430 5431 char * cmd_string; 5432 const char * cmd_prefix = "cmd /C "; 5433 size_t len = strlen(cmd) + strlen(cmd_prefix) + 1; 5434 cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal); 5435 if (cmd_string == NULL) { 5436 return -1; 5437 } 5438 cmd_string[0] = '\0'; 5439 strcat(cmd_string, cmd_prefix); 5440 strcat(cmd_string, cmd); 5441 5442 // now replace all '\n' with '&' 5443 char * substring = cmd_string; 5444 while ((substring = strchr(substring, '\n')) != NULL) { 5445 substring[0] = '&'; 5446 substring++; 5447 } 5448 memset(&si, 0, sizeof(si)); 5449 si.cb = sizeof(si); 5450 memset(&pi, 0, sizeof(pi)); 5451 BOOL rslt = CreateProcess(NULL, // executable name - use command line 5452 cmd_string, // command line 5453 NULL, // process security attribute 5454 NULL, // thread security attribute 5455 TRUE, // inherits system handles 5456 0, // no creation flags 5457 NULL, // use parent's environment block 5458 NULL, // use parent's starting directory 5459 &si, // (in) startup information 5460 &pi); // (out) process information 5461 5462 if (rslt) { 5463 // Wait until child process exits. 5464 WaitForSingleObject(pi.hProcess, INFINITE); 5465 5466 GetExitCodeProcess(pi.hProcess, &exit_code); 5467 5468 // Close process and thread handles. 5469 CloseHandle(pi.hProcess); 5470 CloseHandle(pi.hThread); 5471 } else { 5472 exit_code = -1; 5473 } 5474 5475 FREE_C_HEAP_ARRAY(char, cmd_string); 5476 return (int)exit_code; 5477 } 5478 5479 bool os::find(address addr, outputStream* st) { 5480 int offset = -1; 5481 bool result = false; 5482 char buf[256]; 5483 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) { 5484 st->print(PTR_FORMAT " ", addr); 5485 if (strlen(buf) < sizeof(buf) - 1) { 5486 char* p = strrchr(buf, '\\'); 5487 if (p) { 5488 st->print("%s", p + 1); 5489 } else { 5490 st->print("%s", buf); 5491 } 5492 } else { 5493 // The library name is probably truncated. Let's omit the library name. 5494 // See also JDK-8147512. 5495 } 5496 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) { 5497 st->print("::%s + 0x%x", buf, offset); 5498 } 5499 st->cr(); 5500 result = true; 5501 } 5502 return result; 5503 } 5504 5505 static jint initSock() { 5506 WSADATA wsadata; 5507 5508 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) { 5509 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n", 5510 ::GetLastError()); 5511 return JNI_ERR; 5512 } 5513 return JNI_OK; 5514 } 5515 5516 struct hostent* os::get_host_by_name(char* name) { 5517 return (struct hostent*)gethostbyname(name); 5518 } 5519 5520 int os::socket_close(int fd) { 5521 return ::closesocket(fd); 5522 } 5523 5524 int os::socket(int domain, int type, int protocol) { 5525 return ::socket(domain, type, protocol); 5526 } 5527 5528 int os::connect(int fd, struct sockaddr* him, socklen_t len) { 5529 return ::connect(fd, him, len); 5530 } 5531 5532 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5533 return ::recv(fd, buf, (int)nBytes, flags); 5534 } 5535 5536 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5537 return ::send(fd, buf, (int)nBytes, flags); 5538 } 5539 5540 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5541 return ::send(fd, buf, (int)nBytes, flags); 5542 } 5543 5544 // WINDOWS CONTEXT Flags for THREAD_SAMPLING 5545 #if defined(IA32) 5546 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS) 5547 #elif defined (AMD64) 5548 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT) 5549 #endif 5550 5551 // returns true if thread could be suspended, 5552 // false otherwise 5553 static bool do_suspend(HANDLE* h) { 5554 if (h != NULL) { 5555 if (SuspendThread(*h) != ~0) { 5556 return true; 5557 } 5558 } 5559 return false; 5560 } 5561 5562 // resume the thread 5563 // calling resume on an active thread is a no-op 5564 static void do_resume(HANDLE* h) { 5565 if (h != NULL) { 5566 ResumeThread(*h); 5567 } 5568 } 5569 5570 // retrieve a suspend/resume context capable handle 5571 // from the tid. Caller validates handle return value. 5572 void get_thread_handle_for_extended_context(HANDLE* h, 5573 OSThread::thread_id_t tid) { 5574 if (h != NULL) { 5575 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid); 5576 } 5577 } 5578 5579 // Thread sampling implementation 5580 // 5581 void os::SuspendedThreadTask::internal_do_task() { 5582 CONTEXT ctxt; 5583 HANDLE h = NULL; 5584 5585 // get context capable handle for thread 5586 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id()); 5587 5588 // sanity 5589 if (h == NULL || h == INVALID_HANDLE_VALUE) { 5590 return; 5591 } 5592 5593 // suspend the thread 5594 if (do_suspend(&h)) { 5595 ctxt.ContextFlags = sampling_context_flags; 5596 // get thread context 5597 GetThreadContext(h, &ctxt); 5598 SuspendedThreadTaskContext context(_thread, &ctxt); 5599 // pass context to Thread Sampling impl 5600 do_task(context); 5601 // resume thread 5602 do_resume(&h); 5603 } 5604 5605 // close handle 5606 CloseHandle(h); 5607 } 5608 5609 bool os::start_debugging(char *buf, int buflen) { 5610 int len = (int)strlen(buf); 5611 char *p = &buf[len]; 5612 5613 jio_snprintf(p, buflen-len, 5614 "\n\n" 5615 "Do you want to debug the problem?\n\n" 5616 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n" 5617 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n" 5618 "Otherwise, select 'No' to abort...", 5619 os::current_process_id(), os::current_thread_id()); 5620 5621 bool yes = os::message_box("Unexpected Error", buf); 5622 5623 if (yes) { 5624 // os::breakpoint() calls DebugBreak(), which causes a breakpoint 5625 // exception. If VM is running inside a debugger, the debugger will 5626 // catch the exception. Otherwise, the breakpoint exception will reach 5627 // the default windows exception handler, which can spawn a debugger and 5628 // automatically attach to the dying VM. 5629 os::breakpoint(); 5630 yes = false; 5631 } 5632 return yes; 5633 } 5634 5635 void* os::get_default_process_handle() { 5636 return (void*)GetModuleHandle(NULL); 5637 } 5638 5639 // Builds a platform dependent Agent_OnLoad_<lib_name> function name 5640 // which is used to find statically linked in agents. 5641 // Additionally for windows, takes into account __stdcall names. 5642 // Parameters: 5643 // sym_name: Symbol in library we are looking for 5644 // lib_name: Name of library to look in, NULL for shared libs. 5645 // is_absolute_path == true if lib_name is absolute path to agent 5646 // such as "C:/a/b/L.dll" 5647 // == false if only the base name of the library is passed in 5648 // such as "L" 5649 char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 5650 bool is_absolute_path) { 5651 char *agent_entry_name; 5652 size_t len; 5653 size_t name_len; 5654 size_t prefix_len = strlen(JNI_LIB_PREFIX); 5655 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 5656 const char *start; 5657 5658 if (lib_name != NULL) { 5659 len = name_len = strlen(lib_name); 5660 if (is_absolute_path) { 5661 // Need to strip path, prefix and suffix 5662 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 5663 lib_name = ++start; 5664 } else { 5665 // Need to check for drive prefix 5666 if ((start = strchr(lib_name, ':')) != NULL) { 5667 lib_name = ++start; 5668 } 5669 } 5670 if (len <= (prefix_len + suffix_len)) { 5671 return NULL; 5672 } 5673 lib_name += prefix_len; 5674 name_len = strlen(lib_name) - suffix_len; 5675 } 5676 } 5677 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 5678 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 5679 if (agent_entry_name == NULL) { 5680 return NULL; 5681 } 5682 if (lib_name != NULL) { 5683 const char *p = strrchr(sym_name, '@'); 5684 if (p != NULL && p != sym_name) { 5685 // sym_name == _Agent_OnLoad@XX 5686 strncpy(agent_entry_name, sym_name, (p - sym_name)); 5687 agent_entry_name[(p-sym_name)] = '\0'; 5688 // agent_entry_name == _Agent_OnLoad 5689 strcat(agent_entry_name, "_"); 5690 strncat(agent_entry_name, lib_name, name_len); 5691 strcat(agent_entry_name, p); 5692 // agent_entry_name == _Agent_OnLoad_lib_name@XX 5693 } else { 5694 strcpy(agent_entry_name, sym_name); 5695 strcat(agent_entry_name, "_"); 5696 strncat(agent_entry_name, lib_name, name_len); 5697 } 5698 } else { 5699 strcpy(agent_entry_name, sym_name); 5700 } 5701 return agent_entry_name; 5702 } 5703 5704 #ifndef PRODUCT 5705 5706 // test the code path in reserve_memory_special() that tries to allocate memory in a single 5707 // contiguous memory block at a particular address. 5708 // The test first tries to find a good approximate address to allocate at by using the same 5709 // method to allocate some memory at any address. The test then tries to allocate memory in 5710 // the vicinity (not directly after it to avoid possible by-chance use of that location) 5711 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of 5712 // the previously allocated memory is available for allocation. The only actual failure 5713 // that is reported is when the test tries to allocate at a particular location but gets a 5714 // different valid one. A NULL return value at this point is not considered an error but may 5715 // be legitimate. 5716 void TestReserveMemorySpecial_test() { 5717 if (!UseLargePages) { 5718 return; 5719 } 5720 // save current value of globals 5721 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; 5722 bool old_use_numa_interleaving = UseNUMAInterleaving; 5723 5724 // set globals to make sure we hit the correct code path 5725 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; 5726 5727 // do an allocation at an address selected by the OS to get a good one. 5728 const size_t large_allocation_size = os::large_page_size() * 4; 5729 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); 5730 if (result == NULL) { 5731 } else { 5732 os::release_memory_special(result, large_allocation_size); 5733 5734 // allocate another page within the recently allocated memory area which seems to be a good location. At least 5735 // we managed to get it once. 5736 const size_t expected_allocation_size = os::large_page_size(); 5737 char* expected_location = result + os::large_page_size(); 5738 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); 5739 if (actual_location == NULL) { 5740 } else { 5741 // release memory 5742 os::release_memory_special(actual_location, expected_allocation_size); 5743 // only now check, after releasing any memory to avoid any leaks. 5744 assert(actual_location == expected_location, 5745 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead", 5746 expected_location, expected_allocation_size, actual_location); 5747 } 5748 } 5749 5750 // restore globals 5751 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; 5752 UseNUMAInterleaving = old_use_numa_interleaving; 5753 } 5754 #endif // PRODUCT 5755 5756 /* 5757 All the defined signal names for Windows. 5758 5759 NOTE that not all of these names are accepted by FindSignal! 5760 5761 For various reasons some of these may be rejected at runtime. 5762 5763 Here are the names currently accepted by a user of sun.misc.Signal with 5764 1.4.1 (ignoring potential interaction with use of chaining, etc): 5765 5766 (LIST TBD) 5767 5768 */ 5769 int os::get_signal_number(const char* name) { 5770 static const struct { 5771 const char* name; 5772 int number; 5773 } siglabels [] = 5774 // derived from version 6.0 VC98/include/signal.h 5775 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl 5776 "FPE", SIGFPE, // floating point exception 5777 "SEGV", SIGSEGV, // segment violation 5778 "INT", SIGINT, // interrupt 5779 "TERM", SIGTERM, // software term signal from kill 5780 "BREAK", SIGBREAK, // Ctrl-Break sequence 5781 "ILL", SIGILL}; // illegal instruction 5782 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) { 5783 if (strcmp(name, siglabels[i].name) == 0) { 5784 return siglabels[i].number; 5785 } 5786 } 5787 return -1; 5788 } 5789 5790 // Fast current thread access 5791 5792 int os::win32::_thread_ptr_offset = 0; 5793 5794 static void call_wrapper_dummy() {} 5795 5796 // We need to call the os_exception_wrapper once so that it sets 5797 // up the offset from FS of the thread pointer. 5798 void os::win32::initialize_thread_ptr_offset() { 5799 os::os_exception_wrapper((java_call_t)call_wrapper_dummy, 5800 NULL, NULL, NULL, NULL); 5801 }