Mercurial > hg > truffle
annotate src/os/windows/vm/os_windows.cpp @ 142:8bd1e4487c18
Merge
| author | iveresov |
|---|---|
| date | Sun, 04 May 2008 03:29:31 -0700 |
| parents | ba764ed4b6f2 fcbfc50865ab |
| children | d1605aabd0a1 37f87013dfd8 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #ifdef _WIN64 | |
| 26 // Must be at least Windows 2000 or XP to use VectoredExceptions | |
| 27 #define _WIN32_WINNT 0x500 | |
| 28 #endif | |
| 29 | |
| 30 // do not include precompiled header file | |
| 31 # include "incls/_os_windows.cpp.incl" | |
| 32 | |
| 33 #ifdef _DEBUG | |
| 34 #include <crtdbg.h> | |
| 35 #endif | |
| 36 | |
| 37 | |
| 38 #include <windows.h> | |
| 39 #include <sys/types.h> | |
| 40 #include <sys/stat.h> | |
| 41 #include <sys/timeb.h> | |
| 42 #include <objidl.h> | |
| 43 #include <shlobj.h> | |
| 44 | |
| 45 #include <malloc.h> | |
| 46 #include <signal.h> | |
| 47 #include <direct.h> | |
| 48 #include <errno.h> | |
| 49 #include <fcntl.h> | |
| 50 #include <io.h> | |
| 51 #include <process.h> // For _beginthreadex(), _endthreadex() | |
| 52 #include <imagehlp.h> // For os::dll_address_to_function_name | |
| 53 | |
| 54 /* for enumerating dll libraries */ | |
| 55 #include <tlhelp32.h> | |
| 56 #include <vdmdbg.h> | |
| 57 | |
| 58 // for timer info max values which include all bits | |
| 59 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) | |
| 60 | |
| 61 // For DLL loading/load error detection | |
| 62 // Values of PE COFF | |
| 63 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c | |
| 64 #define IMAGE_FILE_SIGNATURE_LENGTH 4 | |
| 65 | |
| 66 static HANDLE main_process; | |
| 67 static HANDLE main_thread; | |
| 68 static int main_thread_id; | |
| 69 | |
| 70 static FILETIME process_creation_time; | |
| 71 static FILETIME process_exit_time; | |
| 72 static FILETIME process_user_time; | |
| 73 static FILETIME process_kernel_time; | |
| 74 | |
| 75 #ifdef _WIN64 | |
| 76 PVOID topLevelVectoredExceptionHandler = NULL; | |
| 77 #endif | |
| 78 | |
| 79 #ifdef _M_IA64 | |
| 80 #define __CPU__ ia64 | |
| 81 #elif _M_AMD64 | |
| 82 #define __CPU__ amd64 | |
| 83 #else | |
| 84 #define __CPU__ i486 | |
| 85 #endif | |
| 86 | |
| 87 // save DLL module handle, used by GetModuleFileName | |
| 88 | |
| 89 HINSTANCE vm_lib_handle; | |
| 90 static int getLastErrorString(char *buf, size_t len); | |
| 91 | |
| 92 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { | |
| 93 switch (reason) { | |
| 94 case DLL_PROCESS_ATTACH: | |
| 95 vm_lib_handle = hinst; | |
| 96 if(ForceTimeHighResolution) | |
| 97 timeBeginPeriod(1L); | |
| 98 break; | |
| 99 case DLL_PROCESS_DETACH: | |
| 100 if(ForceTimeHighResolution) | |
| 101 timeEndPeriod(1L); | |
| 102 #ifdef _WIN64 | |
| 103 if (topLevelVectoredExceptionHandler != NULL) { | |
| 104 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler); | |
| 105 topLevelVectoredExceptionHandler = NULL; | |
| 106 } | |
| 107 #endif | |
| 108 break; | |
| 109 default: | |
| 110 break; | |
| 111 } | |
| 112 return true; | |
| 113 } | |
| 114 | |
| 115 static inline double fileTimeAsDouble(FILETIME* time) { | |
| 116 const double high = (double) ((unsigned int) ~0); | |
| 117 const double split = 10000000.0; | |
| 118 double result = (time->dwLowDateTime / split) + | |
| 119 time->dwHighDateTime * (high/split); | |
| 120 return result; | |
| 121 } | |
| 122 | |
| 123 // Implementation of os | |
| 124 | |
| 125 bool os::getenv(const char* name, char* buffer, int len) { | |
| 126 int result = GetEnvironmentVariable(name, buffer, len); | |
| 127 return result > 0 && result < len; | |
| 128 } | |
| 129 | |
| 130 | |
| 131 // No setuid programs under Windows. | |
| 132 bool os::have_special_privileges() { | |
| 133 return false; | |
| 134 } | |
| 135 | |
| 136 | |
| 137 // This method is a periodic task to check for misbehaving JNI applications | |
| 138 // under CheckJNI, we can add any periodic checks here. | |
| 139 // For Windows at the moment does nothing | |
| 140 void os::run_periodic_checks() { | |
| 141 return; | |
| 142 } | |
| 143 | |
| 144 #ifndef _WIN64 | |
| 145 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); | |
| 146 #endif | |
| 147 void os::init_system_properties_values() { | |
| 148 /* sysclasspath, java_home, dll_dir */ | |
| 149 { | |
| 150 char *home_path; | |
| 151 char *dll_path; | |
| 152 char *pslash; | |
| 153 char *bin = "\\bin"; | |
| 154 char home_dir[MAX_PATH]; | |
| 155 | |
| 156 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) { | |
| 157 os::jvm_path(home_dir, sizeof(home_dir)); | |
| 158 // Found the full path to jvm[_g].dll. | |
| 159 // Now cut the path to <java_home>/jre if we can. | |
| 160 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */ | |
| 161 pslash = strrchr(home_dir, '\\'); | |
| 162 if (pslash != NULL) { | |
| 163 *pslash = '\0'; /* get rid of \{client|server} */ | |
| 164 pslash = strrchr(home_dir, '\\'); | |
| 165 if (pslash != NULL) | |
| 166 *pslash = '\0'; /* get rid of \bin */ | |
| 167 } | |
| 168 } | |
| 169 | |
| 170 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1); | |
| 171 if (home_path == NULL) | |
| 172 return; | |
| 173 strcpy(home_path, home_dir); | |
| 174 Arguments::set_java_home(home_path); | |
| 175 | |
| 176 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1); | |
| 177 if (dll_path == NULL) | |
| 178 return; | |
| 179 strcpy(dll_path, home_dir); | |
| 180 strcat(dll_path, bin); | |
| 181 Arguments::set_dll_dir(dll_path); | |
| 182 | |
| 183 if (!set_boot_path('\\', ';')) | |
| 184 return; | |
| 185 } | |
| 186 | |
| 187 /* library_path */ | |
| 188 #define EXT_DIR "\\lib\\ext" | |
| 189 #define BIN_DIR "\\bin" | |
| 190 #define PACKAGE_DIR "\\Sun\\Java" | |
| 191 { | |
| 192 /* Win32 library search order (See the documentation for LoadLibrary): | |
| 193 * | |
| 194 * 1. The directory from which application is loaded. | |
| 195 * 2. The current directory | |
| 196 * 3. The system wide Java Extensions directory (Java only) | |
| 197 * 4. System directory (GetSystemDirectory) | |
| 198 * 5. Windows directory (GetWindowsDirectory) | |
| 199 * 6. The PATH environment variable | |
| 200 */ | |
| 201 | |
| 202 char *library_path; | |
| 203 char tmp[MAX_PATH]; | |
| 204 char *path_str = ::getenv("PATH"); | |
| 205 | |
| 206 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + | |
| 207 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10); | |
| 208 | |
| 209 library_path[0] = '\0'; | |
| 210 | |
| 211 GetModuleFileName(NULL, tmp, sizeof(tmp)); | |
| 212 *(strrchr(tmp, '\\')) = '\0'; | |
| 213 strcat(library_path, tmp); | |
| 214 | |
| 215 strcat(library_path, ";."); | |
| 216 | |
| 217 GetWindowsDirectory(tmp, sizeof(tmp)); | |
| 218 strcat(library_path, ";"); | |
| 219 strcat(library_path, tmp); | |
| 220 strcat(library_path, PACKAGE_DIR BIN_DIR); | |
| 221 | |
| 222 GetSystemDirectory(tmp, sizeof(tmp)); | |
| 223 strcat(library_path, ";"); | |
| 224 strcat(library_path, tmp); | |
| 225 | |
| 226 GetWindowsDirectory(tmp, sizeof(tmp)); | |
| 227 strcat(library_path, ";"); | |
| 228 strcat(library_path, tmp); | |
| 229 | |
| 230 if (path_str) { | |
| 231 strcat(library_path, ";"); | |
| 232 strcat(library_path, path_str); | |
| 233 } | |
| 234 | |
| 235 Arguments::set_library_path(library_path); | |
| 236 FREE_C_HEAP_ARRAY(char, library_path); | |
| 237 } | |
| 238 | |
| 239 /* Default extensions directory */ | |
| 240 { | |
| 241 char path[MAX_PATH]; | |
| 242 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; | |
| 243 GetWindowsDirectory(path, MAX_PATH); | |
| 244 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, | |
| 245 path, PACKAGE_DIR, EXT_DIR); | |
| 246 Arguments::set_ext_dirs(buf); | |
| 247 } | |
| 248 #undef EXT_DIR | |
| 249 #undef BIN_DIR | |
| 250 #undef PACKAGE_DIR | |
| 251 | |
| 252 /* Default endorsed standards directory. */ | |
| 253 { | |
| 254 #define ENDORSED_DIR "\\lib\\endorsed" | |
| 255 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR); | |
| 256 char * buf = NEW_C_HEAP_ARRAY(char, len); | |
| 257 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR); | |
| 258 Arguments::set_endorsed_dirs(buf); | |
| 259 #undef ENDORSED_DIR | |
| 260 } | |
| 261 | |
| 262 #ifndef _WIN64 | |
| 263 SetUnhandledExceptionFilter(Handle_FLT_Exception); | |
| 264 #endif | |
| 265 | |
| 266 // Done | |
| 267 return; | |
| 268 } | |
| 269 | |
| 270 void os::breakpoint() { | |
| 271 DebugBreak(); | |
| 272 } | |
| 273 | |
| 274 // Invoked from the BREAKPOINT Macro | |
| 275 extern "C" void breakpoint() { | |
| 276 os::breakpoint(); | |
| 277 } | |
| 278 | |
| 279 // Returns an estimate of the current stack pointer. Result must be guaranteed | |
| 280 // to point into the calling threads stack, and be no lower than the current | |
| 281 // stack pointer. | |
| 282 | |
| 283 address os::current_stack_pointer() { | |
| 284 int dummy; | |
| 285 address sp = (address)&dummy; | |
| 286 return sp; | |
| 287 } | |
| 288 | |
| 289 // os::current_stack_base() | |
| 290 // | |
| 291 // Returns the base of the stack, which is the stack's | |
| 292 // starting address. This function must be called | |
| 293 // while running on the stack of the thread being queried. | |
| 294 | |
| 295 address os::current_stack_base() { | |
| 296 MEMORY_BASIC_INFORMATION minfo; | |
| 297 address stack_bottom; | |
| 298 size_t stack_size; | |
| 299 | |
| 300 VirtualQuery(&minfo, &minfo, sizeof(minfo)); | |
| 301 stack_bottom = (address)minfo.AllocationBase; | |
| 302 stack_size = minfo.RegionSize; | |
| 303 | |
| 304 // Add up the sizes of all the regions with the same | |
| 305 // AllocationBase. | |
| 306 while( 1 ) | |
| 307 { | |
| 308 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); | |
| 309 if ( stack_bottom == (address)minfo.AllocationBase ) | |
| 310 stack_size += minfo.RegionSize; | |
| 311 else | |
| 312 break; | |
| 313 } | |
| 314 | |
| 315 #ifdef _M_IA64 | |
| 316 // IA64 has memory and register stacks | |
| 317 stack_size = stack_size / 2; | |
| 318 #endif | |
| 319 return stack_bottom + stack_size; | |
| 320 } | |
| 321 | |
| 322 size_t os::current_stack_size() { | |
| 323 size_t sz; | |
| 324 MEMORY_BASIC_INFORMATION minfo; | |
| 325 VirtualQuery(&minfo, &minfo, sizeof(minfo)); | |
| 326 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; | |
| 327 return sz; | |
| 328 } | |
| 329 | |
| 330 | |
| 331 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); | |
| 332 | |
| 333 // Thread start routine for all new Java threads | |
| 334 static unsigned __stdcall java_start(Thread* thread) { | |
| 335 // Try to randomize the cache line index of hot stack frames. | |
| 336 // This helps when threads of the same stack traces evict each other's | |
| 337 // cache lines. The threads can be either from the same JVM instance, or | |
| 338 // from different JVM instances. The benefit is especially true for | |
| 339 // processors with hyperthreading technology. | |
| 340 static int counter = 0; | |
| 341 int pid = os::current_process_id(); | |
| 342 _alloca(((pid ^ counter++) & 7) * 128); | |
| 343 | |
| 344 OSThread* osthr = thread->osthread(); | |
| 345 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); | |
| 346 | |
| 347 if (UseNUMA) { | |
| 348 int lgrp_id = os::numa_get_group_id(); | |
| 349 if (lgrp_id != -1) { | |
| 350 thread->set_lgrp_id(lgrp_id); | |
| 351 } | |
| 352 } | |
| 353 | |
| 354 | |
| 355 if (UseVectoredExceptions) { | |
| 356 // If we are using vectored exception we don't need to set a SEH | |
| 357 thread->run(); | |
| 358 } | |
| 359 else { | |
| 360 // Install a win32 structured exception handler around every thread created | |
| 361 // by VM, so VM can genrate error dump when an exception occurred in non- | |
| 362 // Java thread (e.g. VM thread). | |
| 363 __try { | |
| 364 thread->run(); | |
| 365 } __except(topLevelExceptionFilter( | |
| 366 (_EXCEPTION_POINTERS*)_exception_info())) { | |
| 367 // Nothing to do. | |
| 368 } | |
| 369 } | |
| 370 | |
| 371 // One less thread is executing | |
| 372 // When the VMThread gets here, the main thread may have already exited | |
| 373 // which frees the CodeHeap containing the Atomic::add code | |
| 374 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { | |
| 375 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); | |
| 376 } | |
| 377 | |
| 378 return 0; | |
| 379 } | |
| 380 | |
| 381 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) { | |
| 382 // Allocate the OSThread object | |
| 383 OSThread* osthread = new OSThread(NULL, NULL); | |
| 384 if (osthread == NULL) return NULL; | |
| 385 | |
| 386 // Initialize support for Java interrupts | |
| 387 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); | |
| 388 if (interrupt_event == NULL) { | |
| 389 delete osthread; | |
| 390 return NULL; | |
| 391 } | |
| 392 osthread->set_interrupt_event(interrupt_event); | |
| 393 | |
| 394 // Store info on the Win32 thread into the OSThread | |
| 395 osthread->set_thread_handle(thread_handle); | |
| 396 osthread->set_thread_id(thread_id); | |
| 397 | |
| 398 if (UseNUMA) { | |
| 399 int lgrp_id = os::numa_get_group_id(); | |
| 400 if (lgrp_id != -1) { | |
| 401 thread->set_lgrp_id(lgrp_id); | |
| 402 } | |
| 403 } | |
| 404 | |
| 405 // Initial thread state is INITIALIZED, not SUSPENDED | |
| 406 osthread->set_state(INITIALIZED); | |
| 407 | |
| 408 return osthread; | |
| 409 } | |
| 410 | |
| 411 | |
| 412 bool os::create_attached_thread(JavaThread* thread) { | |
| 413 #ifdef ASSERT | |
| 414 thread->verify_not_published(); | |
| 415 #endif | |
| 416 HANDLE thread_h; | |
| 417 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), | |
| 418 &thread_h, THREAD_ALL_ACCESS, false, 0)) { | |
| 419 fatal("DuplicateHandle failed\n"); | |
| 420 } | |
| 421 OSThread* osthread = create_os_thread(thread, thread_h, | |
| 422 (int)current_thread_id()); | |
| 423 if (osthread == NULL) { | |
| 424 return false; | |
| 425 } | |
| 426 | |
| 427 // Initial thread state is RUNNABLE | |
| 428 osthread->set_state(RUNNABLE); | |
| 429 | |
| 430 thread->set_osthread(osthread); | |
| 431 return true; | |
| 432 } | |
| 433 | |
| 434 bool os::create_main_thread(JavaThread* thread) { | |
| 435 #ifdef ASSERT | |
| 436 thread->verify_not_published(); | |
| 437 #endif | |
| 438 if (_starting_thread == NULL) { | |
| 439 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); | |
| 440 if (_starting_thread == NULL) { | |
| 441 return false; | |
| 442 } | |
| 443 } | |
| 444 | |
| 445 // The primordial thread is runnable from the start) | |
| 446 _starting_thread->set_state(RUNNABLE); | |
| 447 | |
| 448 thread->set_osthread(_starting_thread); | |
| 449 return true; | |
| 450 } | |
| 451 | |
| 452 // Allocate and initialize a new OSThread | |
| 453 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
| 454 unsigned thread_id; | |
| 455 | |
| 456 // Allocate the OSThread object | |
| 457 OSThread* osthread = new OSThread(NULL, NULL); | |
| 458 if (osthread == NULL) { | |
| 459 return false; | |
| 460 } | |
| 461 | |
| 462 // Initialize support for Java interrupts | |
| 463 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); | |
| 464 if (interrupt_event == NULL) { | |
| 465 delete osthread; | |
| 466 return NULL; | |
| 467 } | |
| 468 osthread->set_interrupt_event(interrupt_event); | |
| 469 osthread->set_interrupted(false); | |
| 470 | |
| 471 thread->set_osthread(osthread); | |
| 472 | |
| 473 if (stack_size == 0) { | |
| 474 switch (thr_type) { | |
| 475 case os::java_thread: | |
| 476 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss | |
| 477 if (JavaThread::stack_size_at_create() > 0) | |
| 478 stack_size = JavaThread::stack_size_at_create(); | |
| 479 break; | |
| 480 case os::compiler_thread: | |
| 481 if (CompilerThreadStackSize > 0) { | |
| 482 stack_size = (size_t)(CompilerThreadStackSize * K); | |
| 483 break; | |
| 484 } // else fall through: | |
| 485 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
| 486 case os::vm_thread: | |
| 487 case os::pgc_thread: | |
| 488 case os::cgc_thread: | |
| 489 case os::watcher_thread: | |
| 490 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
| 491 break; | |
| 492 } | |
| 493 } | |
| 494 | |
| 495 // Create the Win32 thread | |
| 496 // | |
| 497 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() | |
| 498 // does not specify stack size. Instead, it specifies the size of | |
| 499 // initially committed space. The stack size is determined by | |
| 500 // PE header in the executable. If the committed "stack_size" is larger | |
| 501 // than default value in the PE header, the stack is rounded up to the | |
| 502 // nearest multiple of 1MB. For example if the launcher has default | |
| 503 // stack size of 320k, specifying any size less than 320k does not | |
| 504 // affect the actual stack size at all, it only affects the initial | |
| 505 // commitment. On the other hand, specifying 'stack_size' larger than | |
| 506 // default value may cause significant increase in memory usage, because | |
| 507 // not only the stack space will be rounded up to MB, but also the | |
| 508 // entire space is committed upfront. | |
| 509 // | |
| 510 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' | |
| 511 // for CreateThread() that can treat 'stack_size' as stack size. However we | |
| 512 // are not supposed to call CreateThread() directly according to MSDN | |
| 513 // document because JVM uses C runtime library. The good news is that the | |
| 514 // flag appears to work with _beginthredex() as well. | |
| 515 | |
| 516 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION | |
| 517 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000) | |
| 518 #endif | |
| 519 | |
| 520 HANDLE thread_handle = | |
| 521 (HANDLE)_beginthreadex(NULL, | |
| 522 (unsigned)stack_size, | |
| 523 (unsigned (__stdcall *)(void*)) java_start, | |
| 524 thread, | |
| 525 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, | |
| 526 &thread_id); | |
| 527 if (thread_handle == NULL) { | |
| 528 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again | |
| 529 // without the flag. | |
| 530 thread_handle = | |
| 531 (HANDLE)_beginthreadex(NULL, | |
| 532 (unsigned)stack_size, | |
| 533 (unsigned (__stdcall *)(void*)) java_start, | |
| 534 thread, | |
| 535 CREATE_SUSPENDED, | |
| 536 &thread_id); | |
| 537 } | |
| 538 if (thread_handle == NULL) { | |
| 539 // Need to clean up stuff we've allocated so far | |
| 540 CloseHandle(osthread->interrupt_event()); | |
| 541 thread->set_osthread(NULL); | |
| 542 delete osthread; | |
| 543 return NULL; | |
| 544 } | |
| 545 | |
| 546 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); | |
| 547 | |
| 548 // Store info on the Win32 thread into the OSThread | |
| 549 osthread->set_thread_handle(thread_handle); | |
| 550 osthread->set_thread_id(thread_id); | |
| 551 | |
| 552 // Initial thread state is INITIALIZED, not SUSPENDED | |
| 553 osthread->set_state(INITIALIZED); | |
| 554 | |
| 555 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain | |
| 556 return true; | |
| 557 } | |
| 558 | |
| 559 | |
| 560 // Free Win32 resources related to the OSThread | |
| 561 void os::free_thread(OSThread* osthread) { | |
| 562 assert(osthread != NULL, "osthread not set"); | |
| 563 CloseHandle(osthread->thread_handle()); | |
| 564 CloseHandle(osthread->interrupt_event()); | |
| 565 delete osthread; | |
| 566 } | |
| 567 | |
| 568 | |
| 569 static int has_performance_count = 0; | |
| 570 static jlong first_filetime; | |
| 571 static jlong initial_performance_count; | |
| 572 static jlong performance_frequency; | |
| 573 | |
| 574 | |
| 575 jlong as_long(LARGE_INTEGER x) { | |
| 576 jlong result = 0; // initialization to avoid warning | |
| 577 set_high(&result, x.HighPart); | |
| 578 set_low(&result, x.LowPart); | |
| 579 return result; | |
| 580 } | |
| 581 | |
| 582 | |
| 583 jlong os::elapsed_counter() { | |
| 584 LARGE_INTEGER count; | |
| 585 if (has_performance_count) { | |
| 586 QueryPerformanceCounter(&count); | |
| 587 return as_long(count) - initial_performance_count; | |
| 588 } else { | |
| 589 FILETIME wt; | |
| 590 GetSystemTimeAsFileTime(&wt); | |
| 591 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime); | |
| 592 } | |
| 593 } | |
| 594 | |
| 595 | |
| 596 jlong os::elapsed_frequency() { | |
| 597 if (has_performance_count) { | |
| 598 return performance_frequency; | |
| 599 } else { | |
| 600 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601. | |
| 601 return 10000000; | |
| 602 } | |
| 603 } | |
| 604 | |
| 605 | |
| 606 julong os::available_memory() { | |
| 607 return win32::available_memory(); | |
| 608 } | |
| 609 | |
| 610 julong os::win32::available_memory() { | |
| 611 // FIXME: GlobalMemoryStatus() may return incorrect value if total memory | |
| 612 // is larger than 4GB | |
| 613 MEMORYSTATUS ms; | |
| 614 GlobalMemoryStatus(&ms); | |
| 615 | |
| 616 return (julong)ms.dwAvailPhys; | |
| 617 } | |
| 618 | |
| 619 julong os::physical_memory() { | |
| 620 return win32::physical_memory(); | |
| 621 } | |
| 622 | |
| 623 julong os::allocatable_physical_memory(julong size) { | |
|
20
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624 #ifdef _LP64 |
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625 return size; |
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626 #else |
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627 // Limit to 1400m because of the 2gb address space wall |
| 0 | 628 return MIN2(size, (julong)1400*M); |
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629 #endif |
| 0 | 630 } |
| 631 | |
| 632 // VC6 lacks DWORD_PTR | |
| 633 #if _MSC_VER < 1300 | |
| 634 typedef UINT_PTR DWORD_PTR; | |
| 635 #endif | |
| 636 | |
| 637 int os::active_processor_count() { | |
| 638 DWORD_PTR lpProcessAffinityMask = 0; | |
| 639 DWORD_PTR lpSystemAffinityMask = 0; | |
| 640 int proc_count = processor_count(); | |
| 641 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && | |
| 642 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { | |
| 643 // Nof active processors is number of bits in process affinity mask | |
| 644 int bitcount = 0; | |
| 645 while (lpProcessAffinityMask != 0) { | |
| 646 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); | |
| 647 bitcount++; | |
| 648 } | |
| 649 return bitcount; | |
| 650 } else { | |
| 651 return proc_count; | |
| 652 } | |
| 653 } | |
| 654 | |
| 655 bool os::distribute_processes(uint length, uint* distribution) { | |
| 656 // Not yet implemented. | |
| 657 return false; | |
| 658 } | |
| 659 | |
| 660 bool os::bind_to_processor(uint processor_id) { | |
| 661 // Not yet implemented. | |
| 662 return false; | |
| 663 } | |
| 664 | |
| 665 static void initialize_performance_counter() { | |
| 666 LARGE_INTEGER count; | |
| 667 if (QueryPerformanceFrequency(&count)) { | |
| 668 has_performance_count = 1; | |
| 669 performance_frequency = as_long(count); | |
| 670 QueryPerformanceCounter(&count); | |
| 671 initial_performance_count = as_long(count); | |
| 672 } else { | |
| 673 has_performance_count = 0; | |
| 674 FILETIME wt; | |
| 675 GetSystemTimeAsFileTime(&wt); | |
| 676 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); | |
| 677 } | |
| 678 } | |
| 679 | |
| 680 | |
| 681 double os::elapsedTime() { | |
| 682 return (double) elapsed_counter() / (double) elapsed_frequency(); | |
| 683 } | |
| 684 | |
| 685 | |
| 686 // Windows format: | |
| 687 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. | |
| 688 // Java format: | |
| 689 // Java standards require the number of milliseconds since 1/1/1970 | |
| 690 | |
| 691 // Constant offset - calculated using offset() | |
| 692 static jlong _offset = 116444736000000000; | |
| 693 // Fake time counter for reproducible results when debugging | |
| 694 static jlong fake_time = 0; | |
| 695 | |
| 696 #ifdef ASSERT | |
| 697 // Just to be safe, recalculate the offset in debug mode | |
| 698 static jlong _calculated_offset = 0; | |
| 699 static int _has_calculated_offset = 0; | |
| 700 | |
| 701 jlong offset() { | |
| 702 if (_has_calculated_offset) return _calculated_offset; | |
| 703 SYSTEMTIME java_origin; | |
| 704 java_origin.wYear = 1970; | |
| 705 java_origin.wMonth = 1; | |
| 706 java_origin.wDayOfWeek = 0; // ignored | |
| 707 java_origin.wDay = 1; | |
| 708 java_origin.wHour = 0; | |
| 709 java_origin.wMinute = 0; | |
| 710 java_origin.wSecond = 0; | |
| 711 java_origin.wMilliseconds = 0; | |
| 712 FILETIME jot; | |
| 713 if (!SystemTimeToFileTime(&java_origin, &jot)) { | |
| 714 fatal1("Error = %d\nWindows error", GetLastError()); | |
| 715 } | |
| 716 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); | |
| 717 _has_calculated_offset = 1; | |
| 718 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); | |
| 719 return _calculated_offset; | |
| 720 } | |
| 721 #else | |
| 722 jlong offset() { | |
| 723 return _offset; | |
| 724 } | |
| 725 #endif | |
| 726 | |
| 727 jlong windows_to_java_time(FILETIME wt) { | |
| 728 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); | |
| 729 return (a - offset()) / 10000; | |
| 730 } | |
| 731 | |
| 732 FILETIME java_to_windows_time(jlong l) { | |
| 733 jlong a = (l * 10000) + offset(); | |
| 734 FILETIME result; | |
| 735 result.dwHighDateTime = high(a); | |
| 736 result.dwLowDateTime = low(a); | |
| 737 return result; | |
| 738 } | |
| 739 | |
| 740 jlong os::javaTimeMillis() { | |
| 741 if (UseFakeTimers) { | |
| 742 return fake_time++; | |
| 743 } else { | |
| 61 | 744 FILETIME wt; |
| 745 GetSystemTimeAsFileTime(&wt); | |
| 746 return windows_to_java_time(wt); | |
| 0 | 747 } |
| 748 } | |
| 749 | |
| 750 #define NANOS_PER_SEC CONST64(1000000000) | |
| 751 #define NANOS_PER_MILLISEC 1000000 | |
| 752 jlong os::javaTimeNanos() { | |
| 753 if (!has_performance_count) { | |
| 754 return javaTimeMillis() * NANOS_PER_MILLISEC; // the best we can do. | |
| 755 } else { | |
| 756 LARGE_INTEGER current_count; | |
| 757 QueryPerformanceCounter(¤t_count); | |
| 758 double current = as_long(current_count); | |
| 759 double freq = performance_frequency; | |
| 760 jlong time = (jlong)((current/freq) * NANOS_PER_SEC); | |
| 761 return time; | |
| 762 } | |
| 763 } | |
| 764 | |
| 765 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
| 766 if (!has_performance_count) { | |
| 767 // javaTimeMillis() doesn't have much percision, | |
| 768 // but it is not going to wrap -- so all 64 bits | |
| 769 info_ptr->max_value = ALL_64_BITS; | |
| 770 | |
| 771 // this is a wall clock timer, so may skip | |
| 772 info_ptr->may_skip_backward = true; | |
| 773 info_ptr->may_skip_forward = true; | |
| 774 } else { | |
| 775 jlong freq = performance_frequency; | |
| 776 if (freq < NANOS_PER_SEC) { | |
| 777 // the performance counter is 64 bits and we will | |
| 778 // be multiplying it -- so no wrap in 64 bits | |
| 779 info_ptr->max_value = ALL_64_BITS; | |
| 780 } else if (freq > NANOS_PER_SEC) { | |
| 781 // use the max value the counter can reach to | |
| 782 // determine the max value which could be returned | |
| 783 julong max_counter = (julong)ALL_64_BITS; | |
| 784 info_ptr->max_value = (jlong)(max_counter / (freq / NANOS_PER_SEC)); | |
| 785 } else { | |
| 786 // the performance counter is 64 bits and we will | |
| 787 // be using it directly -- so no wrap in 64 bits | |
| 788 info_ptr->max_value = ALL_64_BITS; | |
| 789 } | |
| 790 | |
| 791 // using a counter, so no skipping | |
| 792 info_ptr->may_skip_backward = false; | |
| 793 info_ptr->may_skip_forward = false; | |
| 794 } | |
| 795 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
| 796 } | |
| 797 | |
| 798 char* os::local_time_string(char *buf, size_t buflen) { | |
| 799 SYSTEMTIME st; | |
| 800 GetLocalTime(&st); | |
| 801 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
| 802 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); | |
| 803 return buf; | |
| 804 } | |
| 805 | |
| 806 bool os::getTimesSecs(double* process_real_time, | |
| 807 double* process_user_time, | |
| 808 double* process_system_time) { | |
| 809 HANDLE h_process = GetCurrentProcess(); | |
| 810 FILETIME create_time, exit_time, kernel_time, user_time; | |
| 811 BOOL result = GetProcessTimes(h_process, | |
| 812 &create_time, | |
| 813 &exit_time, | |
| 814 &kernel_time, | |
| 815 &user_time); | |
| 816 if (result != 0) { | |
| 817 FILETIME wt; | |
| 818 GetSystemTimeAsFileTime(&wt); | |
| 819 jlong rtc_millis = windows_to_java_time(wt); | |
| 820 jlong user_millis = windows_to_java_time(user_time); | |
| 821 jlong system_millis = windows_to_java_time(kernel_time); | |
| 822 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); | |
| 823 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); | |
| 824 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); | |
| 825 return true; | |
| 826 } else { | |
| 827 return false; | |
| 828 } | |
| 829 } | |
| 830 | |
| 831 void os::shutdown() { | |
| 832 | |
| 833 // allow PerfMemory to attempt cleanup of any persistent resources | |
| 834 perfMemory_exit(); | |
| 835 | |
| 836 // flush buffered output, finish log files | |
| 837 ostream_abort(); | |
| 838 | |
| 839 // Check for abort hook | |
| 840 abort_hook_t abort_hook = Arguments::abort_hook(); | |
| 841 if (abort_hook != NULL) { | |
| 842 abort_hook(); | |
| 843 } | |
| 844 } | |
| 845 | |
| 846 void os::abort(bool dump_core) | |
| 847 { | |
| 848 os::shutdown(); | |
| 849 // no core dump on Windows | |
| 850 ::exit(1); | |
| 851 } | |
| 852 | |
| 853 // Die immediately, no exit hook, no abort hook, no cleanup. | |
| 854 void os::die() { | |
| 855 _exit(-1); | |
| 856 } | |
| 857 | |
| 858 // Directory routines copied from src/win32/native/java/io/dirent_md.c | |
| 859 // * dirent_md.c 1.15 00/02/02 | |
| 860 // | |
| 861 // The declarations for DIR and struct dirent are in jvm_win32.h. | |
| 862 | |
| 863 /* Caller must have already run dirname through JVM_NativePath, which removes | |
| 864 duplicate slashes and converts all instances of '/' into '\\'. */ | |
| 865 | |
| 866 DIR * | |
| 867 os::opendir(const char *dirname) | |
| 868 { | |
| 869 assert(dirname != NULL, "just checking"); // hotspot change | |
| 870 DIR *dirp = (DIR *)malloc(sizeof(DIR)); | |
| 871 DWORD fattr; // hotspot change | |
| 872 char alt_dirname[4] = { 0, 0, 0, 0 }; | |
| 873 | |
| 874 if (dirp == 0) { | |
| 875 errno = ENOMEM; | |
| 876 return 0; | |
| 877 } | |
| 878 | |
| 879 /* | |
| 880 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it | |
| 881 * as a directory in FindFirstFile(). We detect this case here and | |
| 882 * prepend the current drive name. | |
| 883 */ | |
| 884 if (dirname[1] == '\0' && dirname[0] == '\\') { | |
| 885 alt_dirname[0] = _getdrive() + 'A' - 1; | |
| 886 alt_dirname[1] = ':'; | |
| 887 alt_dirname[2] = '\\'; | |
| 888 alt_dirname[3] = '\0'; | |
| 889 dirname = alt_dirname; | |
| 890 } | |
| 891 | |
| 892 dirp->path = (char *)malloc(strlen(dirname) + 5); | |
| 893 if (dirp->path == 0) { | |
| 894 free(dirp); | |
| 895 errno = ENOMEM; | |
| 896 return 0; | |
| 897 } | |
| 898 strcpy(dirp->path, dirname); | |
| 899 | |
| 900 fattr = GetFileAttributes(dirp->path); | |
| 901 if (fattr == 0xffffffff) { | |
| 902 free(dirp->path); | |
| 903 free(dirp); | |
| 904 errno = ENOENT; | |
| 905 return 0; | |
| 906 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { | |
| 907 free(dirp->path); | |
| 908 free(dirp); | |
| 909 errno = ENOTDIR; | |
| 910 return 0; | |
| 911 } | |
| 912 | |
| 913 /* Append "*.*", or possibly "\\*.*", to path */ | |
| 914 if (dirp->path[1] == ':' | |
| 915 && (dirp->path[2] == '\0' | |
| 916 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { | |
| 917 /* No '\\' needed for cases like "Z:" or "Z:\" */ | |
| 918 strcat(dirp->path, "*.*"); | |
| 919 } else { | |
| 920 strcat(dirp->path, "\\*.*"); | |
| 921 } | |
| 922 | |
| 923 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); | |
| 924 if (dirp->handle == INVALID_HANDLE_VALUE) { | |
| 925 if (GetLastError() != ERROR_FILE_NOT_FOUND) { | |
| 926 free(dirp->path); | |
| 927 free(dirp); | |
| 928 errno = EACCES; | |
| 929 return 0; | |
| 930 } | |
| 931 } | |
| 932 return dirp; | |
| 933 } | |
| 934 | |
| 935 /* parameter dbuf unused on Windows */ | |
| 936 | |
| 937 struct dirent * | |
| 938 os::readdir(DIR *dirp, dirent *dbuf) | |
| 939 { | |
| 940 assert(dirp != NULL, "just checking"); // hotspot change | |
| 941 if (dirp->handle == INVALID_HANDLE_VALUE) { | |
| 942 return 0; | |
| 943 } | |
| 944 | |
| 945 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); | |
| 946 | |
| 947 if (!FindNextFile(dirp->handle, &dirp->find_data)) { | |
| 948 if (GetLastError() == ERROR_INVALID_HANDLE) { | |
| 949 errno = EBADF; | |
| 950 return 0; | |
| 951 } | |
| 952 FindClose(dirp->handle); | |
| 953 dirp->handle = INVALID_HANDLE_VALUE; | |
| 954 } | |
| 955 | |
| 956 return &dirp->dirent; | |
| 957 } | |
| 958 | |
| 959 int | |
| 960 os::closedir(DIR *dirp) | |
| 961 { | |
| 962 assert(dirp != NULL, "just checking"); // hotspot change | |
| 963 if (dirp->handle != INVALID_HANDLE_VALUE) { | |
| 964 if (!FindClose(dirp->handle)) { | |
| 965 errno = EBADF; | |
| 966 return -1; | |
| 967 } | |
| 968 dirp->handle = INVALID_HANDLE_VALUE; | |
| 969 } | |
| 970 free(dirp->path); | |
| 971 free(dirp); | |
| 972 return 0; | |
| 973 } | |
| 974 | |
| 975 const char* os::dll_file_extension() { return ".dll"; } | |
| 976 | |
| 977 const char * os::get_temp_directory() | |
| 978 { | |
| 979 static char path_buf[MAX_PATH]; | |
| 980 if (GetTempPath(MAX_PATH, path_buf)>0) | |
| 981 return path_buf; | |
| 982 else{ | |
| 983 path_buf[0]='\0'; | |
| 984 return path_buf; | |
| 985 } | |
| 986 } | |
| 987 | |
| 988 // Needs to be in os specific directory because windows requires another | |
| 989 // header file <direct.h> | |
| 990 const char* os::get_current_directory(char *buf, int buflen) { | |
| 991 return _getcwd(buf, buflen); | |
| 992 } | |
| 993 | |
| 994 //----------------------------------------------------------- | |
| 995 // Helper functions for fatal error handler | |
| 996 | |
| 997 // The following library functions are resolved dynamically at runtime: | |
| 998 | |
| 999 // PSAPI functions, for Windows NT, 2000, XP | |
| 1000 | |
| 1001 // psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform | |
| 1002 // SDK from Microsoft. Here are the definitions copied from psapi.h | |
| 1003 typedef struct _MODULEINFO { | |
| 1004 LPVOID lpBaseOfDll; | |
| 1005 DWORD SizeOfImage; | |
| 1006 LPVOID EntryPoint; | |
| 1007 } MODULEINFO, *LPMODULEINFO; | |
| 1008 | |
| 1009 static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD ); | |
| 1010 static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD ); | |
| 1011 static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD ); | |
| 1012 | |
| 1013 // ToolHelp Functions, for Windows 95, 98 and ME | |
| 1014 | |
| 1015 static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ; | |
| 1016 static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ; | |
| 1017 static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ; | |
| 1018 | |
| 1019 bool _has_psapi; | |
| 1020 bool _psapi_init = false; | |
| 1021 bool _has_toolhelp; | |
| 1022 | |
| 1023 static bool _init_psapi() { | |
| 1024 HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ; | |
| 1025 if( psapi == NULL ) return false ; | |
| 1026 | |
| 1027 _EnumProcessModules = CAST_TO_FN_PTR( | |
| 1028 BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD), | |
| 1029 GetProcAddress(psapi, "EnumProcessModules")) ; | |
| 1030 _GetModuleFileNameEx = CAST_TO_FN_PTR( | |
| 1031 DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD), | |
| 1032 GetProcAddress(psapi, "GetModuleFileNameExA")); | |
| 1033 _GetModuleInformation = CAST_TO_FN_PTR( | |
| 1034 BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD), | |
| 1035 GetProcAddress(psapi, "GetModuleInformation")); | |
| 1036 | |
| 1037 _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation); | |
| 1038 _psapi_init = true; | |
| 1039 return _has_psapi; | |
| 1040 } | |
| 1041 | |
| 1042 static bool _init_toolhelp() { | |
| 1043 HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ; | |
| 1044 if (kernel32 == NULL) return false ; | |
| 1045 | |
| 1046 _CreateToolhelp32Snapshot = CAST_TO_FN_PTR( | |
| 1047 HANDLE(WINAPI *)(DWORD,DWORD), | |
| 1048 GetProcAddress(kernel32, "CreateToolhelp32Snapshot")); | |
| 1049 _Module32First = CAST_TO_FN_PTR( | |
| 1050 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32), | |
| 1051 GetProcAddress(kernel32, "Module32First" )); | |
| 1052 _Module32Next = CAST_TO_FN_PTR( | |
| 1053 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32), | |
| 1054 GetProcAddress(kernel32, "Module32Next" )); | |
| 1055 | |
| 1056 _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next); | |
| 1057 return _has_toolhelp; | |
| 1058 } | |
| 1059 | |
| 1060 #ifdef _WIN64 | |
| 1061 // Helper routine which returns true if address in | |
| 1062 // within the NTDLL address space. | |
| 1063 // | |
| 1064 static bool _addr_in_ntdll( address addr ) | |
| 1065 { | |
| 1066 HMODULE hmod; | |
| 1067 MODULEINFO minfo; | |
| 1068 | |
| 1069 hmod = GetModuleHandle("NTDLL.DLL"); | |
| 1070 if ( hmod == NULL ) return false; | |
| 1071 if ( !_GetModuleInformation( GetCurrentProcess(), hmod, | |
| 1072 &minfo, sizeof(MODULEINFO)) ) | |
| 1073 return false; | |
| 1074 | |
| 1075 if ( (addr >= minfo.lpBaseOfDll) && | |
| 1076 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) | |
| 1077 return true; | |
| 1078 else | |
| 1079 return false; | |
| 1080 } | |
| 1081 #endif | |
| 1082 | |
| 1083 | |
| 1084 // Enumerate all modules for a given process ID | |
| 1085 // | |
| 1086 // Notice that Windows 95/98/Me and Windows NT/2000/XP have | |
| 1087 // different API for doing this. We use PSAPI.DLL on NT based | |
| 1088 // Windows and ToolHelp on 95/98/Me. | |
| 1089 | |
| 1090 // Callback function that is called by enumerate_modules() on | |
| 1091 // every DLL module. | |
| 1092 // Input parameters: | |
| 1093 // int pid, | |
| 1094 // char* module_file_name, | |
| 1095 // address module_base_addr, | |
| 1096 // unsigned module_size, | |
| 1097 // void* param | |
| 1098 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *); | |
| 1099 | |
| 1100 // enumerate_modules for Windows NT, using PSAPI | |
| 1101 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param) | |
| 1102 { | |
| 1103 HANDLE hProcess ; | |
| 1104 | |
| 1105 # define MAX_NUM_MODULES 128 | |
| 1106 HMODULE modules[MAX_NUM_MODULES]; | |
| 1107 static char filename[ MAX_PATH ]; | |
| 1108 int result = 0; | |
| 1109 | |
| 1110 if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0; | |
| 1111 | |
| 1112 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, | |
| 1113 FALSE, pid ) ; | |
| 1114 if (hProcess == NULL) return 0; | |
| 1115 | |
| 1116 DWORD size_needed; | |
| 1117 if (!_EnumProcessModules(hProcess, modules, | |
| 1118 sizeof(modules), &size_needed)) { | |
| 1119 CloseHandle( hProcess ); | |
| 1120 return 0; | |
| 1121 } | |
| 1122 | |
| 1123 // number of modules that are currently loaded | |
| 1124 int num_modules = size_needed / sizeof(HMODULE); | |
| 1125 | |
| 1126 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { | |
| 1127 // Get Full pathname: | |
| 1128 if(!_GetModuleFileNameEx(hProcess, modules[i], | |
| 1129 filename, sizeof(filename))) { | |
| 1130 filename[0] = '\0'; | |
| 1131 } | |
| 1132 | |
| 1133 MODULEINFO modinfo; | |
| 1134 if (!_GetModuleInformation(hProcess, modules[i], | |
| 1135 &modinfo, sizeof(modinfo))) { | |
| 1136 modinfo.lpBaseOfDll = NULL; | |
| 1137 modinfo.SizeOfImage = 0; | |
| 1138 } | |
| 1139 | |
| 1140 // Invoke callback function | |
| 1141 result = func(pid, filename, (address)modinfo.lpBaseOfDll, | |
| 1142 modinfo.SizeOfImage, param); | |
| 1143 if (result) break; | |
| 1144 } | |
| 1145 | |
| 1146 CloseHandle( hProcess ) ; | |
| 1147 return result; | |
| 1148 } | |
| 1149 | |
| 1150 | |
| 1151 // enumerate_modules for Windows 95/98/ME, using TOOLHELP | |
| 1152 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param) | |
| 1153 { | |
| 1154 HANDLE hSnapShot ; | |
| 1155 static MODULEENTRY32 modentry ; | |
| 1156 int result = 0; | |
| 1157 | |
| 1158 if (!_has_toolhelp) return 0; | |
| 1159 | |
| 1160 // Get a handle to a Toolhelp snapshot of the system | |
| 1161 hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ; | |
| 1162 if( hSnapShot == INVALID_HANDLE_VALUE ) { | |
| 1163 return FALSE ; | |
| 1164 } | |
| 1165 | |
| 1166 // iterate through all modules | |
| 1167 modentry.dwSize = sizeof(MODULEENTRY32) ; | |
| 1168 bool not_done = _Module32First( hSnapShot, &modentry ) != 0; | |
| 1169 | |
| 1170 while( not_done ) { | |
| 1171 // invoke the callback | |
| 1172 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr, | |
| 1173 modentry.modBaseSize, param); | |
| 1174 if (result) break; | |
| 1175 | |
| 1176 modentry.dwSize = sizeof(MODULEENTRY32) ; | |
| 1177 not_done = _Module32Next( hSnapShot, &modentry ) != 0; | |
| 1178 } | |
| 1179 | |
| 1180 CloseHandle(hSnapShot); | |
| 1181 return result; | |
| 1182 } | |
| 1183 | |
| 1184 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param ) | |
| 1185 { | |
| 1186 // Get current process ID if caller doesn't provide it. | |
| 1187 if (!pid) pid = os::current_process_id(); | |
| 1188 | |
| 1189 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param); | |
| 1190 else return _enumerate_modules_windows(pid, func, param); | |
| 1191 } | |
| 1192 | |
| 1193 struct _modinfo { | |
| 1194 address addr; | |
| 1195 char* full_path; // point to a char buffer | |
| 1196 int buflen; // size of the buffer | |
| 1197 address base_addr; | |
| 1198 }; | |
| 1199 | |
| 1200 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr, | |
| 1201 unsigned size, void * param) { | |
| 1202 struct _modinfo *pmod = (struct _modinfo *)param; | |
| 1203 if (!pmod) return -1; | |
| 1204 | |
| 1205 if (base_addr <= pmod->addr && | |
| 1206 base_addr+size > pmod->addr) { | |
| 1207 // if a buffer is provided, copy path name to the buffer | |
| 1208 if (pmod->full_path) { | |
| 1209 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); | |
| 1210 } | |
| 1211 pmod->base_addr = base_addr; | |
| 1212 return 1; | |
| 1213 } | |
| 1214 return 0; | |
| 1215 } | |
| 1216 | |
| 1217 bool os::dll_address_to_library_name(address addr, char* buf, | |
| 1218 int buflen, int* offset) { | |
| 1219 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always | |
| 1220 // return the full path to the DLL file, sometimes it returns path | |
| 1221 // to the corresponding PDB file (debug info); sometimes it only | |
| 1222 // returns partial path, which makes life painful. | |
| 1223 | |
| 1224 struct _modinfo mi; | |
| 1225 mi.addr = addr; | |
| 1226 mi.full_path = buf; | |
| 1227 mi.buflen = buflen; | |
| 1228 int pid = os::current_process_id(); | |
| 1229 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) { | |
| 1230 // buf already contains path name | |
| 1231 if (offset) *offset = addr - mi.base_addr; | |
| 1232 return true; | |
| 1233 } else { | |
| 1234 if (buf) buf[0] = '\0'; | |
| 1235 if (offset) *offset = -1; | |
| 1236 return false; | |
| 1237 } | |
| 1238 } | |
| 1239 | |
| 1240 bool os::dll_address_to_function_name(address addr, char *buf, | |
| 1241 int buflen, int *offset) { | |
| 1242 // Unimplemented on Windows - in order to use SymGetSymFromAddr(), | |
| 1243 // we need to initialize imagehlp/dbghelp, then load symbol table | |
| 1244 // for every module. That's too much work to do after a fatal error. | |
| 1245 // For an example on how to implement this function, see 1.4.2. | |
| 1246 if (offset) *offset = -1; | |
| 1247 if (buf) buf[0] = '\0'; | |
| 1248 return false; | |
| 1249 } | |
| 1250 | |
| 1251 // save the start and end address of jvm.dll into param[0] and param[1] | |
| 1252 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr, | |
| 1253 unsigned size, void * param) { | |
| 1254 if (!param) return -1; | |
| 1255 | |
| 1256 if (base_addr <= (address)_locate_jvm_dll && | |
| 1257 base_addr+size > (address)_locate_jvm_dll) { | |
| 1258 ((address*)param)[0] = base_addr; | |
| 1259 ((address*)param)[1] = base_addr + size; | |
| 1260 return 1; | |
| 1261 } | |
| 1262 return 0; | |
| 1263 } | |
| 1264 | |
| 1265 address vm_lib_location[2]; // start and end address of jvm.dll | |
| 1266 | |
| 1267 // check if addr is inside jvm.dll | |
| 1268 bool os::address_is_in_vm(address addr) { | |
| 1269 if (!vm_lib_location[0] || !vm_lib_location[1]) { | |
| 1270 int pid = os::current_process_id(); | |
| 1271 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) { | |
| 1272 assert(false, "Can't find jvm module."); | |
| 1273 return false; | |
| 1274 } | |
| 1275 } | |
| 1276 | |
| 1277 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); | |
| 1278 } | |
| 1279 | |
| 1280 // print module info; param is outputStream* | |
| 1281 static int _print_module(int pid, char* fname, address base, | |
| 1282 unsigned size, void* param) { | |
| 1283 if (!param) return -1; | |
| 1284 | |
| 1285 outputStream* st = (outputStream*)param; | |
| 1286 | |
| 1287 address end_addr = base + size; | |
| 1288 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname); | |
| 1289 return 0; | |
| 1290 } | |
| 1291 | |
| 1292 // Loads .dll/.so and | |
| 1293 // in case of error it checks if .dll/.so was built for the | |
| 1294 // same architecture as Hotspot is running on | |
| 1295 void * os::dll_load(const char *name, char *ebuf, int ebuflen) | |
| 1296 { | |
| 1297 void * result = LoadLibrary(name); | |
| 1298 if (result != NULL) | |
| 1299 { | |
| 1300 return result; | |
| 1301 } | |
| 1302 | |
| 1303 long errcode = GetLastError(); | |
| 1304 if (errcode == ERROR_MOD_NOT_FOUND) { | |
| 1305 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1); | |
| 1306 ebuf[ebuflen-1]='\0'; | |
| 1307 return NULL; | |
| 1308 } | |
| 1309 | |
| 1310 // Parsing dll below | |
| 1311 // If we can read dll-info and find that dll was built | |
| 1312 // for an architecture other than Hotspot is running in | |
| 1313 // - then print to buffer "DLL was built for a different architecture" | |
| 1314 // else call getLastErrorString to obtain system error message | |
| 1315 | |
| 1316 // Read system error message into ebuf | |
| 1317 // It may or may not be overwritten below (in the for loop and just above) | |
| 1318 getLastErrorString(ebuf, (size_t) ebuflen); | |
| 1319 ebuf[ebuflen-1]='\0'; | |
| 1320 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0); | |
| 1321 if (file_descriptor<0) | |
| 1322 { | |
| 1323 return NULL; | |
| 1324 } | |
| 1325 | |
| 1326 uint32_t signature_offset; | |
| 1327 uint16_t lib_arch=0; | |
| 1328 bool failed_to_get_lib_arch= | |
| 1329 ( | |
| 1330 //Go to position 3c in the dll | |
| 1331 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0) | |
| 1332 || | |
| 1333 // Read loacation of signature | |
| 1334 (sizeof(signature_offset)!= | |
| 1335 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset)))) | |
| 1336 || | |
| 1337 //Go to COFF File Header in dll | |
| 1338 //that is located after"signature" (4 bytes long) | |
| 1339 (os::seek_to_file_offset(file_descriptor, | |
| 1340 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0) | |
| 1341 || | |
| 1342 //Read field that contains code of architecture | |
| 1343 // that dll was build for | |
| 1344 (sizeof(lib_arch)!= | |
| 1345 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch)))) | |
| 1346 ); | |
| 1347 | |
| 1348 ::close(file_descriptor); | |
| 1349 if (failed_to_get_lib_arch) | |
| 1350 { | |
| 1351 // file i/o error - report getLastErrorString(...) msg | |
| 1352 return NULL; | |
| 1353 } | |
| 1354 | |
| 1355 typedef struct | |
| 1356 { | |
| 1357 uint16_t arch_code; | |
| 1358 char* arch_name; | |
| 1359 } arch_t; | |
| 1360 | |
| 1361 static const arch_t arch_array[]={ | |
| 1362 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, | |
| 1363 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, | |
| 1364 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} | |
| 1365 }; | |
| 1366 #if (defined _M_IA64) | |
| 1367 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64; | |
| 1368 #elif (defined _M_AMD64) | |
| 1369 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64; | |
| 1370 #elif (defined _M_IX86) | |
| 1371 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386; | |
| 1372 #else | |
| 1373 #error Method os::dll_load requires that one of following \ | |
| 1374 is defined :_M_IA64,_M_AMD64 or _M_IX86 | |
| 1375 #endif | |
| 1376 | |
| 1377 | |
| 1378 // Obtain a string for printf operation | |
| 1379 // lib_arch_str shall contain string what platform this .dll was built for | |
| 1380 // running_arch_str shall string contain what platform Hotspot was built for | |
| 1381 char *running_arch_str=NULL,*lib_arch_str=NULL; | |
| 1382 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++) | |
| 1383 { | |
| 1384 if (lib_arch==arch_array[i].arch_code) | |
| 1385 lib_arch_str=arch_array[i].arch_name; | |
| 1386 if (running_arch==arch_array[i].arch_code) | |
| 1387 running_arch_str=arch_array[i].arch_name; | |
| 1388 } | |
| 1389 | |
| 1390 assert(running_arch_str, | |
| 1391 "Didn't find runing architecture code in arch_array"); | |
| 1392 | |
| 1393 // If the architure is right | |
| 1394 // but some other error took place - report getLastErrorString(...) msg | |
| 1395 if (lib_arch == running_arch) | |
| 1396 { | |
| 1397 return NULL; | |
| 1398 } | |
| 1399 | |
| 1400 if (lib_arch_str!=NULL) | |
| 1401 { | |
| 1402 ::_snprintf(ebuf, ebuflen-1, | |
| 1403 "Can't load %s-bit .dll on a %s-bit platform", | |
| 1404 lib_arch_str,running_arch_str); | |
| 1405 } | |
| 1406 else | |
| 1407 { | |
| 1408 // don't know what architecture this dll was build for | |
| 1409 ::_snprintf(ebuf, ebuflen-1, | |
| 1410 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", | |
| 1411 lib_arch,running_arch_str); | |
| 1412 } | |
| 1413 | |
| 1414 return NULL; | |
| 1415 } | |
| 1416 | |
| 1417 | |
| 1418 void os::print_dll_info(outputStream *st) { | |
| 1419 int pid = os::current_process_id(); | |
| 1420 st->print_cr("Dynamic libraries:"); | |
| 1421 enumerate_modules(pid, _print_module, (void *)st); | |
| 1422 } | |
| 1423 | |
| 1424 void os::print_os_info(outputStream* st) { | |
| 1425 st->print("OS:"); | |
| 1426 | |
| 1427 OSVERSIONINFOEX osvi; | |
| 1428 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); | |
| 1429 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); | |
| 1430 | |
| 1431 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { | |
| 1432 st->print_cr("N/A"); | |
| 1433 return; | |
| 1434 } | |
| 1435 | |
| 1436 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion; | |
| 1437 | |
| 1438 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) { | |
| 1439 switch (os_vers) { | |
| 1440 case 3051: st->print(" Windows NT 3.51"); break; | |
| 1441 case 4000: st->print(" Windows NT 4.0"); break; | |
| 1442 case 5000: st->print(" Windows 2000"); break; | |
| 1443 case 5001: st->print(" Windows XP"); break; | |
| 1444 case 5002: st->print(" Windows Server 2003 family"); break; | |
| 1445 case 6000: st->print(" Windows Vista"); break; | |
| 1446 default: // future windows, print out its major and minor versions | |
| 1447 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); | |
| 1448 } | |
| 1449 } else { | |
| 1450 switch (os_vers) { | |
| 1451 case 4000: st->print(" Windows 95"); break; | |
| 1452 case 4010: st->print(" Windows 98"); break; | |
| 1453 case 4090: st->print(" Windows Me"); break; | |
| 1454 default: // future windows, print out its major and minor versions | |
| 1455 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); | |
| 1456 } | |
| 1457 } | |
| 1458 | |
| 1459 st->print(" Build %d", osvi.dwBuildNumber); | |
| 1460 st->print(" %s", osvi.szCSDVersion); // service pack | |
| 1461 st->cr(); | |
| 1462 } | |
| 1463 | |
| 1464 void os::print_memory_info(outputStream* st) { | |
| 1465 st->print("Memory:"); | |
| 1466 st->print(" %dk page", os::vm_page_size()>>10); | |
| 1467 | |
| 1468 // FIXME: GlobalMemoryStatus() may return incorrect value if total memory | |
| 1469 // is larger than 4GB | |
| 1470 MEMORYSTATUS ms; | |
| 1471 GlobalMemoryStatus(&ms); | |
| 1472 | |
| 1473 st->print(", physical %uk", os::physical_memory() >> 10); | |
| 1474 st->print("(%uk free)", os::available_memory() >> 10); | |
| 1475 | |
| 1476 st->print(", swap %uk", ms.dwTotalPageFile >> 10); | |
| 1477 st->print("(%uk free)", ms.dwAvailPageFile >> 10); | |
| 1478 st->cr(); | |
| 1479 } | |
| 1480 | |
| 1481 void os::print_siginfo(outputStream *st, void *siginfo) { | |
| 1482 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; | |
| 1483 st->print("siginfo:"); | |
| 1484 st->print(" ExceptionCode=0x%x", er->ExceptionCode); | |
| 1485 | |
| 1486 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && | |
| 1487 er->NumberParameters >= 2) { | |
| 1488 switch (er->ExceptionInformation[0]) { | |
| 1489 case 0: st->print(", reading address"); break; | |
| 1490 case 1: st->print(", writing address"); break; | |
| 1491 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, | |
| 1492 er->ExceptionInformation[0]); | |
| 1493 } | |
| 1494 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); | |
| 1495 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && | |
| 1496 er->NumberParameters >= 2 && UseSharedSpaces) { | |
| 1497 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
| 1498 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { | |
| 1499 st->print("\n\nError accessing class data sharing archive." \ | |
| 1500 " Mapped file inaccessible during execution, " \ | |
| 1501 " possible disk/network problem."); | |
| 1502 } | |
| 1503 } else { | |
| 1504 int num = er->NumberParameters; | |
| 1505 if (num > 0) { | |
| 1506 st->print(", ExceptionInformation="); | |
| 1507 for (int i = 0; i < num; i++) { | |
| 1508 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); | |
| 1509 } | |
| 1510 } | |
| 1511 } | |
| 1512 st->cr(); | |
| 1513 } | |
| 1514 | |
| 1515 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
| 1516 // do nothing | |
| 1517 } | |
| 1518 | |
| 1519 static char saved_jvm_path[MAX_PATH] = {0}; | |
| 1520 | |
| 1521 // Find the full path to the current module, jvm.dll or jvm_g.dll | |
| 1522 void os::jvm_path(char *buf, jint buflen) { | |
| 1523 // Error checking. | |
| 1524 if (buflen < MAX_PATH) { | |
| 1525 assert(false, "must use a large-enough buffer"); | |
| 1526 buf[0] = '\0'; | |
| 1527 return; | |
| 1528 } | |
| 1529 // Lazy resolve the path to current module. | |
| 1530 if (saved_jvm_path[0] != 0) { | |
| 1531 strcpy(buf, saved_jvm_path); | |
| 1532 return; | |
| 1533 } | |
| 1534 | |
| 1535 GetModuleFileName(vm_lib_handle, buf, buflen); | |
| 1536 strcpy(saved_jvm_path, buf); | |
| 1537 } | |
| 1538 | |
| 1539 | |
| 1540 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
| 1541 #ifndef _WIN64 | |
| 1542 st->print("_"); | |
| 1543 #endif | |
| 1544 } | |
| 1545 | |
| 1546 | |
| 1547 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
| 1548 #ifndef _WIN64 | |
| 1549 st->print("@%d", args_size * sizeof(int)); | |
| 1550 #endif | |
| 1551 } | |
| 1552 | |
| 1553 // sun.misc.Signal | |
| 1554 // NOTE that this is a workaround for an apparent kernel bug where if | |
| 1555 // a signal handler for SIGBREAK is installed then that signal handler | |
| 1556 // takes priority over the console control handler for CTRL_CLOSE_EVENT. | |
| 1557 // See bug 4416763. | |
| 1558 static void (*sigbreakHandler)(int) = NULL; | |
| 1559 | |
| 1560 static void UserHandler(int sig, void *siginfo, void *context) { | |
| 1561 os::signal_notify(sig); | |
| 1562 // We need to reinstate the signal handler each time... | |
| 1563 os::signal(sig, (void*)UserHandler); | |
| 1564 } | |
| 1565 | |
| 1566 void* os::user_handler() { | |
| 1567 return (void*) UserHandler; | |
| 1568 } | |
| 1569 | |
| 1570 void* os::signal(int signal_number, void* handler) { | |
| 1571 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { | |
| 1572 void (*oldHandler)(int) = sigbreakHandler; | |
| 1573 sigbreakHandler = (void (*)(int)) handler; | |
| 1574 return (void*) oldHandler; | |
| 1575 } else { | |
| 1576 return (void*)::signal(signal_number, (void (*)(int))handler); | |
| 1577 } | |
| 1578 } | |
| 1579 | |
| 1580 void os::signal_raise(int signal_number) { | |
| 1581 raise(signal_number); | |
| 1582 } | |
| 1583 | |
| 1584 // The Win32 C runtime library maps all console control events other than ^C | |
| 1585 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, | |
| 1586 // logoff, and shutdown events. We therefore install our own console handler | |
| 1587 // that raises SIGTERM for the latter cases. | |
| 1588 // | |
| 1589 static BOOL WINAPI consoleHandler(DWORD event) { | |
| 1590 switch(event) { | |
| 1591 case CTRL_C_EVENT: | |
| 1592 if (is_error_reported()) { | |
| 1593 // Ctrl-C is pressed during error reporting, likely because the error | |
| 1594 // handler fails to abort. Let VM die immediately. | |
| 1595 os::die(); | |
| 1596 } | |
| 1597 | |
| 1598 os::signal_raise(SIGINT); | |
| 1599 return TRUE; | |
| 1600 break; | |
| 1601 case CTRL_BREAK_EVENT: | |
| 1602 if (sigbreakHandler != NULL) { | |
| 1603 (*sigbreakHandler)(SIGBREAK); | |
| 1604 } | |
| 1605 return TRUE; | |
| 1606 break; | |
| 1607 case CTRL_CLOSE_EVENT: | |
| 1608 case CTRL_LOGOFF_EVENT: | |
| 1609 case CTRL_SHUTDOWN_EVENT: | |
| 1610 os::signal_raise(SIGTERM); | |
| 1611 return TRUE; | |
| 1612 break; | |
| 1613 default: | |
| 1614 break; | |
| 1615 } | |
| 1616 return FALSE; | |
| 1617 } | |
| 1618 | |
| 1619 /* | |
| 1620 * The following code is moved from os.cpp for making this | |
| 1621 * code platform specific, which it is by its very nature. | |
| 1622 */ | |
| 1623 | |
| 1624 // Return maximum OS signal used + 1 for internal use only | |
| 1625 // Used as exit signal for signal_thread | |
| 1626 int os::sigexitnum_pd(){ | |
| 1627 return NSIG; | |
| 1628 } | |
| 1629 | |
| 1630 // a counter for each possible signal value, including signal_thread exit signal | |
| 1631 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
| 1632 static HANDLE sig_sem; | |
| 1633 | |
| 1634 void os::signal_init_pd() { | |
| 1635 // Initialize signal structures | |
| 1636 memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
| 1637 | |
| 1638 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); | |
| 1639 | |
| 1640 // Programs embedding the VM do not want it to attempt to receive | |
| 1641 // events like CTRL_LOGOFF_EVENT, which are used to implement the | |
| 1642 // shutdown hooks mechanism introduced in 1.3. For example, when | |
| 1643 // the VM is run as part of a Windows NT service (i.e., a servlet | |
| 1644 // engine in a web server), the correct behavior is for any console | |
| 1645 // control handler to return FALSE, not TRUE, because the OS's | |
| 1646 // "final" handler for such events allows the process to continue if | |
| 1647 // it is a service (while terminating it if it is not a service). | |
| 1648 // To make this behavior uniform and the mechanism simpler, we | |
| 1649 // completely disable the VM's usage of these console events if -Xrs | |
| 1650 // (=ReduceSignalUsage) is specified. This means, for example, that | |
| 1651 // the CTRL-BREAK thread dump mechanism is also disabled in this | |
| 1652 // case. See bugs 4323062, 4345157, and related bugs. | |
| 1653 | |
| 1654 if (!ReduceSignalUsage) { | |
| 1655 // Add a CTRL-C handler | |
| 1656 SetConsoleCtrlHandler(consoleHandler, TRUE); | |
| 1657 } | |
| 1658 } | |
| 1659 | |
| 1660 void os::signal_notify(int signal_number) { | |
| 1661 BOOL ret; | |
| 1662 | |
| 1663 Atomic::inc(&pending_signals[signal_number]); | |
| 1664 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); | |
| 1665 assert(ret != 0, "ReleaseSemaphore() failed"); | |
| 1666 } | |
| 1667 | |
| 1668 static int check_pending_signals(bool wait_for_signal) { | |
| 1669 DWORD ret; | |
| 1670 while (true) { | |
| 1671 for (int i = 0; i < NSIG + 1; i++) { | |
| 1672 jint n = pending_signals[i]; | |
| 1673 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
| 1674 return i; | |
| 1675 } | |
| 1676 } | |
| 1677 if (!wait_for_signal) { | |
| 1678 return -1; | |
| 1679 } | |
| 1680 | |
| 1681 JavaThread *thread = JavaThread::current(); | |
| 1682 | |
| 1683 ThreadBlockInVM tbivm(thread); | |
| 1684 | |
| 1685 bool threadIsSuspended; | |
| 1686 do { | |
| 1687 thread->set_suspend_equivalent(); | |
| 1688 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
| 1689 ret = ::WaitForSingleObject(sig_sem, INFINITE); | |
| 1690 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); | |
| 1691 | |
| 1692 // were we externally suspended while we were waiting? | |
| 1693 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
| 1694 if (threadIsSuspended) { | |
| 1695 // | |
| 1696 // The semaphore has been incremented, but while we were waiting | |
| 1697 // another thread suspended us. We don't want to continue running | |
| 1698 // while suspended because that would surprise the thread that | |
| 1699 // suspended us. | |
| 1700 // | |
| 1701 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); | |
| 1702 assert(ret != 0, "ReleaseSemaphore() failed"); | |
| 1703 | |
| 1704 thread->java_suspend_self(); | |
| 1705 } | |
| 1706 } while (threadIsSuspended); | |
| 1707 } | |
| 1708 } | |
| 1709 | |
| 1710 int os::signal_lookup() { | |
| 1711 return check_pending_signals(false); | |
| 1712 } | |
| 1713 | |
| 1714 int os::signal_wait() { | |
| 1715 return check_pending_signals(true); | |
| 1716 } | |
| 1717 | |
| 1718 // Implicit OS exception handling | |
| 1719 | |
| 1720 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) { | |
| 1721 JavaThread* thread = JavaThread::current(); | |
| 1722 // Save pc in thread | |
| 1723 #ifdef _M_IA64 | |
| 1724 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP); | |
| 1725 // Set pc to handler | |
| 1726 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; | |
| 1727 #elif _M_AMD64 | |
| 1728 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip); | |
| 1729 // Set pc to handler | |
| 1730 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; | |
| 1731 #else | |
| 1732 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip); | |
| 1733 // Set pc to handler | |
| 1734 exceptionInfo->ContextRecord->Eip = (LONG)handler; | |
| 1735 #endif | |
| 1736 | |
| 1737 // Continue the execution | |
| 1738 return EXCEPTION_CONTINUE_EXECUTION; | |
| 1739 } | |
| 1740 | |
| 1741 | |
| 1742 // Used for PostMortemDump | |
| 1743 extern "C" void safepoints(); | |
| 1744 extern "C" void find(int x); | |
| 1745 extern "C" void events(); | |
| 1746 | |
| 1747 // According to Windows API documentation, an illegal instruction sequence should generate | |
| 1748 // the 0xC000001C exception code. However, real world experience shows that occasionnaly | |
| 1749 // the execution of an illegal instruction can generate the exception code 0xC000001E. This | |
| 1750 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). | |
| 1751 | |
| 1752 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E | |
| 1753 | |
| 1754 // From "Execution Protection in the Windows Operating System" draft 0.35 | |
| 1755 // Once a system header becomes available, the "real" define should be | |
| 1756 // included or copied here. | |
| 1757 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08 | |
| 1758 | |
| 1759 #define def_excpt(val) #val, val | |
| 1760 | |
| 1761 struct siglabel { | |
| 1762 char *name; | |
| 1763 int number; | |
| 1764 }; | |
| 1765 | |
| 1766 struct siglabel exceptlabels[] = { | |
| 1767 def_excpt(EXCEPTION_ACCESS_VIOLATION), | |
| 1768 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), | |
| 1769 def_excpt(EXCEPTION_BREAKPOINT), | |
| 1770 def_excpt(EXCEPTION_SINGLE_STEP), | |
| 1771 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), | |
| 1772 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), | |
| 1773 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), | |
| 1774 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), | |
| 1775 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), | |
| 1776 def_excpt(EXCEPTION_FLT_OVERFLOW), | |
| 1777 def_excpt(EXCEPTION_FLT_STACK_CHECK), | |
| 1778 def_excpt(EXCEPTION_FLT_UNDERFLOW), | |
| 1779 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), | |
| 1780 def_excpt(EXCEPTION_INT_OVERFLOW), | |
| 1781 def_excpt(EXCEPTION_PRIV_INSTRUCTION), | |
| 1782 def_excpt(EXCEPTION_IN_PAGE_ERROR), | |
| 1783 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), | |
| 1784 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), | |
| 1785 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), | |
| 1786 def_excpt(EXCEPTION_STACK_OVERFLOW), | |
| 1787 def_excpt(EXCEPTION_INVALID_DISPOSITION), | |
| 1788 def_excpt(EXCEPTION_GUARD_PAGE), | |
| 1789 def_excpt(EXCEPTION_INVALID_HANDLE), | |
| 1790 NULL, 0 | |
| 1791 }; | |
| 1792 | |
| 1793 const char* os::exception_name(int exception_code, char *buf, size_t size) { | |
| 1794 for (int i = 0; exceptlabels[i].name != NULL; i++) { | |
| 1795 if (exceptlabels[i].number == exception_code) { | |
| 1796 jio_snprintf(buf, size, "%s", exceptlabels[i].name); | |
| 1797 return buf; | |
| 1798 } | |
| 1799 } | |
| 1800 | |
| 1801 return NULL; | |
| 1802 } | |
| 1803 | |
| 1804 //----------------------------------------------------------------------------- | |
| 1805 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { | |
| 1806 // handle exception caused by idiv; should only happen for -MinInt/-1 | |
| 1807 // (division by zero is handled explicitly) | |
| 1808 #ifdef _M_IA64 | |
| 1809 assert(0, "Fix Handle_IDiv_Exception"); | |
| 1810 #elif _M_AMD64 | |
| 1811 PCONTEXT ctx = exceptionInfo->ContextRecord; | |
| 1812 address pc = (address)ctx->Rip; | |
| 1813 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc)); | |
| 1814 assert(pc[0] == 0xF7, "not an idiv opcode"); | |
| 1815 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); | |
| 1816 assert(ctx->Rax == min_jint, "unexpected idiv exception"); | |
| 1817 // set correct result values and continue after idiv instruction | |
| 1818 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes | |
| 1819 ctx->Rax = (DWORD)min_jint; // result | |
| 1820 ctx->Rdx = (DWORD)0; // remainder | |
| 1821 // Continue the execution | |
| 1822 #else | |
| 1823 PCONTEXT ctx = exceptionInfo->ContextRecord; | |
| 1824 address pc = (address)ctx->Eip; | |
| 1825 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc)); | |
| 1826 assert(pc[0] == 0xF7, "not an idiv opcode"); | |
| 1827 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); | |
| 1828 assert(ctx->Eax == min_jint, "unexpected idiv exception"); | |
| 1829 // set correct result values and continue after idiv instruction | |
| 1830 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes | |
| 1831 ctx->Eax = (DWORD)min_jint; // result | |
| 1832 ctx->Edx = (DWORD)0; // remainder | |
| 1833 // Continue the execution | |
| 1834 #endif | |
| 1835 return EXCEPTION_CONTINUE_EXECUTION; | |
| 1836 } | |
| 1837 | |
| 1838 #ifndef _WIN64 | |
| 1839 //----------------------------------------------------------------------------- | |
| 1840 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { | |
| 1841 // handle exception caused by native mothod modifying control word | |
| 1842 PCONTEXT ctx = exceptionInfo->ContextRecord; | |
| 1843 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; | |
| 1844 | |
| 1845 switch (exception_code) { | |
| 1846 case EXCEPTION_FLT_DENORMAL_OPERAND: | |
| 1847 case EXCEPTION_FLT_DIVIDE_BY_ZERO: | |
| 1848 case EXCEPTION_FLT_INEXACT_RESULT: | |
| 1849 case EXCEPTION_FLT_INVALID_OPERATION: | |
| 1850 case EXCEPTION_FLT_OVERFLOW: | |
| 1851 case EXCEPTION_FLT_STACK_CHECK: | |
| 1852 case EXCEPTION_FLT_UNDERFLOW: | |
| 1853 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); | |
| 1854 if (fp_control_word != ctx->FloatSave.ControlWord) { | |
| 1855 // Restore FPCW and mask out FLT exceptions | |
| 1856 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; | |
| 1857 // Mask out pending FLT exceptions | |
| 1858 ctx->FloatSave.StatusWord &= 0xffffff00; | |
| 1859 return EXCEPTION_CONTINUE_EXECUTION; | |
| 1860 } | |
| 1861 } | |
| 1862 return EXCEPTION_CONTINUE_SEARCH; | |
| 1863 } | |
| 1864 #else //_WIN64 | |
| 1865 /* | |
| 1866 On Windows, the mxcsr control bits are non-volatile across calls | |
| 1867 See also CR 6192333 | |
| 1868 If EXCEPTION_FLT_* happened after some native method modified | |
| 1869 mxcsr - it is not a jvm fault. | |
| 1870 However should we decide to restore of mxcsr after a faulty | |
| 1871 native method we can uncomment following code | |
| 1872 jint MxCsr = INITIAL_MXCSR; | |
| 1873 // we can't use StubRoutines::addr_mxcsr_std() | |
| 1874 // because in Win64 mxcsr is not saved there | |
| 1875 if (MxCsr != ctx->MxCsr) { | |
| 1876 ctx->MxCsr = MxCsr; | |
| 1877 return EXCEPTION_CONTINUE_EXECUTION; | |
| 1878 } | |
| 1879 | |
| 1880 */ | |
| 1881 #endif //_WIN64 | |
| 1882 | |
| 1883 | |
| 1884 // Fatal error reporting is single threaded so we can make this a | |
| 1885 // static and preallocated. If it's more than MAX_PATH silently ignore | |
| 1886 // it. | |
| 1887 static char saved_error_file[MAX_PATH] = {0}; | |
| 1888 | |
| 1889 void os::set_error_file(const char *logfile) { | |
| 1890 if (strlen(logfile) <= MAX_PATH) { | |
| 1891 strncpy(saved_error_file, logfile, MAX_PATH); | |
| 1892 } | |
| 1893 } | |
| 1894 | |
| 1895 static inline void report_error(Thread* t, DWORD exception_code, | |
| 1896 address addr, void* siginfo, void* context) { | |
| 1897 VMError err(t, exception_code, addr, siginfo, context); | |
| 1898 err.report_and_die(); | |
| 1899 | |
| 1900 // If UseOsErrorReporting, this will return here and save the error file | |
| 1901 // somewhere where we can find it in the minidump. | |
| 1902 } | |
| 1903 | |
| 1904 //----------------------------------------------------------------------------- | |
| 1905 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { | |
| 1906 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; | |
| 1907 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; | |
| 1908 #ifdef _M_IA64 | |
| 1909 address pc = (address) exceptionInfo->ContextRecord->StIIP; | |
| 1910 #elif _M_AMD64 | |
| 1911 address pc = (address) exceptionInfo->ContextRecord->Rip; | |
| 1912 #else | |
| 1913 address pc = (address) exceptionInfo->ContextRecord->Eip; | |
| 1914 #endif | |
| 1915 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady | |
| 1916 | |
| 1917 #ifndef _WIN64 | |
| 1918 // Execution protection violation - win32 running on AMD64 only | |
| 1919 // Handled first to avoid misdiagnosis as a "normal" access violation; | |
| 1920 // This is safe to do because we have a new/unique ExceptionInformation | |
| 1921 // code for this condition. | |
| 1922 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { | |
| 1923 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; | |
| 1924 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; | |
| 1925 address addr = (address) exceptionRecord->ExceptionInformation[1]; | |
| 1926 | |
| 1927 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { | |
| 1928 int page_size = os::vm_page_size(); | |
| 1929 | |
| 1930 // Make sure the pc and the faulting address are sane. | |
| 1931 // | |
| 1932 // If an instruction spans a page boundary, and the page containing | |
| 1933 // the beginning of the instruction is executable but the following | |
| 1934 // page is not, the pc and the faulting address might be slightly | |
| 1935 // different - we still want to unguard the 2nd page in this case. | |
| 1936 // | |
| 1937 // 15 bytes seems to be a (very) safe value for max instruction size. | |
| 1938 bool pc_is_near_addr = | |
| 1939 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); | |
| 1940 bool instr_spans_page_boundary = | |
| 1941 (align_size_down((intptr_t) pc ^ (intptr_t) addr, | |
| 1942 (intptr_t) page_size) > 0); | |
| 1943 | |
| 1944 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { | |
| 1945 static volatile address last_addr = | |
| 1946 (address) os::non_memory_address_word(); | |
| 1947 | |
| 1948 // In conservative mode, don't unguard unless the address is in the VM | |
| 1949 if (UnguardOnExecutionViolation > 0 && addr != last_addr && | |
| 1950 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { | |
| 1951 | |
| 1952 // Unguard and retry | |
| 1953 address page_start = | |
| 1954 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); | |
| 1955 bool res = os::unguard_memory((char*) page_start, page_size); | |
| 1956 | |
| 1957 if (PrintMiscellaneous && Verbose) { | |
| 1958 char buf[256]; | |
| 1959 jio_snprintf(buf, sizeof(buf), "Execution protection violation " | |
| 1960 "at " INTPTR_FORMAT | |
| 1961 ", unguarding " INTPTR_FORMAT ": %s", addr, | |
| 1962 page_start, (res ? "success" : strerror(errno))); | |
| 1963 tty->print_raw_cr(buf); | |
| 1964 } | |
| 1965 | |
| 1966 // Set last_addr so if we fault again at the same address, we don't | |
| 1967 // end up in an endless loop. | |
| 1968 // | |
| 1969 // There are two potential complications here. Two threads trapping | |
| 1970 // at the same address at the same time could cause one of the | |
| 1971 // threads to think it already unguarded, and abort the VM. Likely | |
| 1972 // very rare. | |
| 1973 // | |
| 1974 // The other race involves two threads alternately trapping at | |
| 1975 // different addresses and failing to unguard the page, resulting in | |
| 1976 // an endless loop. This condition is probably even more unlikely | |
| 1977 // than the first. | |
| 1978 // | |
| 1979 // Although both cases could be avoided by using locks or thread | |
| 1980 // local last_addr, these solutions are unnecessary complication: | |
| 1981 // this handler is a best-effort safety net, not a complete solution. | |
| 1982 // It is disabled by default and should only be used as a workaround | |
| 1983 // in case we missed any no-execute-unsafe VM code. | |
| 1984 | |
| 1985 last_addr = addr; | |
| 1986 | |
| 1987 return EXCEPTION_CONTINUE_EXECUTION; | |
| 1988 } | |
| 1989 } | |
| 1990 | |
| 1991 // Last unguard failed or not unguarding | |
| 1992 tty->print_raw_cr("Execution protection violation"); | |
| 1993 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, | |
| 1994 exceptionInfo->ContextRecord); | |
| 1995 return EXCEPTION_CONTINUE_SEARCH; | |
| 1996 } | |
| 1997 } | |
| 1998 #endif // _WIN64 | |
| 1999 | |
| 2000 // Check to see if we caught the safepoint code in the | |
| 2001 // process of write protecting the memory serialization page. | |
| 2002 // It write enables the page immediately after protecting it | |
| 2003 // so just return. | |
| 2004 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { | |
| 2005 JavaThread* thread = (JavaThread*) t; | |
| 2006 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; | |
| 2007 address addr = (address) exceptionRecord->ExceptionInformation[1]; | |
| 2008 if ( os::is_memory_serialize_page(thread, addr) ) { | |
| 2009 // Block current thread until the memory serialize page permission restored. | |
| 2010 os::block_on_serialize_page_trap(); | |
| 2011 return EXCEPTION_CONTINUE_EXECUTION; | |
| 2012 } | |
| 2013 } | |
| 2014 | |
| 2015 | |
| 2016 if (t != NULL && t->is_Java_thread()) { | |
| 2017 JavaThread* thread = (JavaThread*) t; | |
| 2018 bool in_java = thread->thread_state() == _thread_in_Java; | |
| 2019 | |
| 2020 // Handle potential stack overflows up front. | |
| 2021 if (exception_code == EXCEPTION_STACK_OVERFLOW) { | |
| 2022 if (os::uses_stack_guard_pages()) { | |
| 2023 #ifdef _M_IA64 | |
| 2024 // | |
| 2025 // If it's a legal stack address continue, Windows will map it in. | |
| 2026 // | |
| 2027 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; | |
| 2028 address addr = (address) exceptionRecord->ExceptionInformation[1]; | |
| 2029 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) | |
| 2030 return EXCEPTION_CONTINUE_EXECUTION; | |
| 2031 | |
| 2032 // The register save area is the same size as the memory stack | |
| 2033 // and starts at the page just above the start of the memory stack. | |
| 2034 // If we get a fault in this area, we've run out of register | |
| 2035 // stack. If we are in java, try throwing a stack overflow exception. | |
| 2036 if (addr > thread->stack_base() && | |
| 2037 addr <= (thread->stack_base()+thread->stack_size()) ) { | |
| 2038 char buf[256]; | |
| 2039 jio_snprintf(buf, sizeof(buf), | |
| 2040 "Register stack overflow, addr:%p, stack_base:%p\n", | |
| 2041 addr, thread->stack_base() ); | |
| 2042 tty->print_raw_cr(buf); | |
| 2043 // If not in java code, return and hope for the best. | |
| 2044 return in_java ? Handle_Exception(exceptionInfo, | |
| 2045 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) | |
| 2046 : EXCEPTION_CONTINUE_EXECUTION; | |
| 2047 } | |
| 2048 #endif | |
| 2049 if (thread->stack_yellow_zone_enabled()) { | |
| 2050 // Yellow zone violation. The o/s has unprotected the first yellow | |
| 2051 // zone page for us. Note: must call disable_stack_yellow_zone to | |
| 2052 // update the enabled status, even if the zone contains only one page. | |
| 2053 thread->disable_stack_yellow_zone(); | |
| 2054 // If not in java code, return and hope for the best. | |
| 2055 return in_java ? Handle_Exception(exceptionInfo, | |
| 2056 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) | |
| 2057 : EXCEPTION_CONTINUE_EXECUTION; | |
| 2058 } else { | |
| 2059 // Fatal red zone violation. | |
| 2060 thread->disable_stack_red_zone(); | |
| 2061 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); | |
| 2062 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, | |
| 2063 exceptionInfo->ContextRecord); | |
| 2064 return EXCEPTION_CONTINUE_SEARCH; | |
| 2065 } | |
| 2066 } else if (in_java) { | |
| 2067 // JVM-managed guard pages cannot be used on win95/98. The o/s provides | |
| 2068 // a one-time-only guard page, which it has released to us. The next | |
| 2069 // stack overflow on this thread will result in an ACCESS_VIOLATION. | |
| 2070 return Handle_Exception(exceptionInfo, | |
| 2071 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); | |
| 2072 } else { | |
| 2073 // Can only return and hope for the best. Further stack growth will | |
| 2074 // result in an ACCESS_VIOLATION. | |
| 2075 return EXCEPTION_CONTINUE_EXECUTION; | |
| 2076 } | |
| 2077 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { | |
| 2078 // Either stack overflow or null pointer exception. | |
| 2079 if (in_java) { | |
| 2080 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; | |
| 2081 address addr = (address) exceptionRecord->ExceptionInformation[1]; | |
| 2082 address stack_end = thread->stack_base() - thread->stack_size(); | |
| 2083 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { | |
| 2084 // Stack overflow. | |
| 2085 assert(!os::uses_stack_guard_pages(), | |
| 2086 "should be caught by red zone code above."); | |
| 2087 return Handle_Exception(exceptionInfo, | |
| 2088 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); | |
| 2089 } | |
| 2090 // | |
| 2091 // Check for safepoint polling and implicit null | |
| 2092 // We only expect null pointers in the stubs (vtable) | |
| 2093 // the rest are checked explicitly now. | |
| 2094 // | |
| 2095 CodeBlob* cb = CodeCache::find_blob(pc); | |
| 2096 if (cb != NULL) { | |
| 2097 if (os::is_poll_address(addr)) { | |
| 2098 address stub = SharedRuntime::get_poll_stub(pc); | |
| 2099 return Handle_Exception(exceptionInfo, stub); | |
| 2100 } | |
| 2101 } | |
| 2102 { | |
| 2103 #ifdef _WIN64 | |
| 2104 // | |
| 2105 // If it's a legal stack address map the entire region in | |
| 2106 // | |
| 2107 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; | |
| 2108 address addr = (address) exceptionRecord->ExceptionInformation[1]; | |
| 2109 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) { | |
| 2110 addr = (address)((uintptr_t)addr & | |
| 2111 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); | |
| 2112 os::commit_memory( (char *)addr, thread->stack_base() - addr ); | |
| 2113 return EXCEPTION_CONTINUE_EXECUTION; | |
| 2114 } | |
| 2115 else | |
| 2116 #endif | |
| 2117 { | |
| 2118 // Null pointer exception. | |
| 2119 #ifdef _M_IA64 | |
| 2120 // We catch register stack overflows in compiled code by doing | |
| 2121 // an explicit compare and executing a st8(G0, G0) if the | |
| 2122 // BSP enters into our guard area. We test for the overflow | |
| 2123 // condition and fall into the normal null pointer exception | |
| 2124 // code if BSP hasn't overflowed. | |
| 2125 if ( in_java ) { | |
| 2126 if(thread->register_stack_overflow()) { | |
| 2127 assert((address)exceptionInfo->ContextRecord->IntS3 == | |
| 2128 thread->register_stack_limit(), | |
| 2129 "GR7 doesn't contain register_stack_limit"); | |
| 2130 // Disable the yellow zone which sets the state that | |
| 2131 // we've got a stack overflow problem. | |
| 2132 if (thread->stack_yellow_zone_enabled()) { | |
| 2133 thread->disable_stack_yellow_zone(); | |
| 2134 } | |
| 2135 // Give us some room to process the exception | |
| 2136 thread->disable_register_stack_guard(); | |
| 2137 // Update GR7 with the new limit so we can continue running | |
| 2138 // compiled code. | |
| 2139 exceptionInfo->ContextRecord->IntS3 = | |
| 2140 (ULONGLONG)thread->register_stack_limit(); | |
| 2141 return Handle_Exception(exceptionInfo, | |
| 2142 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); | |
| 2143 } else { | |
| 2144 // | |
| 2145 // Check for implicit null | |
| 2146 // We only expect null pointers in the stubs (vtable) | |
| 2147 // the rest are checked explicitly now. | |
| 2148 // | |
| 2149 CodeBlob* cb = CodeCache::find_blob(pc); | |
| 2150 if (cb != NULL) { | |
| 2151 if (VtableStubs::stub_containing(pc) != NULL) { | |
| 2152 if (((uintptr_t)addr) < os::vm_page_size() ) { | |
| 2153 // an access to the first page of VM--assume it is a null pointer | |
| 2154 return Handle_Exception(exceptionInfo, | |
| 2155 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL)); | |
| 2156 } | |
| 2157 } | |
| 2158 } | |
| 2159 } | |
| 2160 } // in_java | |
| 2161 | |
| 2162 // IA64 doesn't use implicit null checking yet. So we shouldn't | |
| 2163 // get here. | |
| 2164 tty->print_raw_cr("Access violation, possible null pointer exception"); | |
| 2165 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, | |
| 2166 exceptionInfo->ContextRecord); | |
| 2167 return EXCEPTION_CONTINUE_SEARCH; | |
| 2168 #else /* !IA64 */ | |
| 2169 | |
| 2170 // Windows 98 reports faulting addresses incorrectly | |
| 2171 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || | |
| 2172 !os::win32::is_nt()) { | |
| 2173 return Handle_Exception(exceptionInfo, | |
| 2174 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL)); | |
| 2175 } | |
| 2176 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, | |
| 2177 exceptionInfo->ContextRecord); | |
| 2178 return EXCEPTION_CONTINUE_SEARCH; | |
| 2179 #endif | |
| 2180 } | |
| 2181 } | |
| 2182 } | |
| 2183 | |
| 2184 #ifdef _WIN64 | |
| 2185 // Special care for fast JNI field accessors. | |
| 2186 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks | |
| 2187 // in and the heap gets shrunk before the field access. | |
| 2188 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { | |
| 2189 address addr = JNI_FastGetField::find_slowcase_pc(pc); | |
| 2190 if (addr != (address)-1) { | |
| 2191 return Handle_Exception(exceptionInfo, addr); | |
| 2192 } | |
| 2193 } | |
| 2194 #endif | |
| 2195 | |
| 2196 #ifdef _WIN64 | |
| 2197 // Windows will sometimes generate an access violation | |
| 2198 // when we call malloc. Since we use VectoredExceptions | |
| 2199 // on 64 bit platforms, we see this exception. We must | |
| 2200 // pass this exception on so Windows can recover. | |
| 2201 // We check to see if the pc of the fault is in NTDLL.DLL | |
| 2202 // if so, we pass control on to Windows for handling. | |
| 2203 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH; | |
| 2204 #endif | |
| 2205 | |
| 2206 // Stack overflow or null pointer exception in native code. | |
| 2207 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, | |
| 2208 exceptionInfo->ContextRecord); | |
| 2209 return EXCEPTION_CONTINUE_SEARCH; | |
| 2210 } | |
| 2211 | |
| 2212 if (in_java) { | |
| 2213 switch (exception_code) { | |
| 2214 case EXCEPTION_INT_DIVIDE_BY_ZERO: | |
| 2215 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); | |
| 2216 | |
| 2217 case EXCEPTION_INT_OVERFLOW: | |
| 2218 return Handle_IDiv_Exception(exceptionInfo); | |
| 2219 | |
| 2220 } // switch | |
| 2221 } | |
| 2222 #ifndef _WIN64 | |
| 2223 if ((thread->thread_state() == _thread_in_Java) || | |
| 2224 (thread->thread_state() == _thread_in_native) ) | |
| 2225 { | |
| 2226 LONG result=Handle_FLT_Exception(exceptionInfo); | |
| 2227 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; | |
| 2228 } | |
| 2229 #endif //_WIN64 | |
| 2230 } | |
| 2231 | |
| 2232 if (exception_code != EXCEPTION_BREAKPOINT) { | |
| 2233 #ifndef _WIN64 | |
| 2234 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, | |
| 2235 exceptionInfo->ContextRecord); | |
| 2236 #else | |
| 2237 // Itanium Windows uses a VectoredExceptionHandler | |
| 2238 // Which means that C++ programatic exception handlers (try/except) | |
| 2239 // will get here. Continue the search for the right except block if | |
| 2240 // the exception code is not a fatal code. | |
| 2241 switch ( exception_code ) { | |
| 2242 case EXCEPTION_ACCESS_VIOLATION: | |
| 2243 case EXCEPTION_STACK_OVERFLOW: | |
| 2244 case EXCEPTION_ILLEGAL_INSTRUCTION: | |
| 2245 case EXCEPTION_ILLEGAL_INSTRUCTION_2: | |
| 2246 case EXCEPTION_INT_OVERFLOW: | |
| 2247 case EXCEPTION_INT_DIVIDE_BY_ZERO: | |
| 2248 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, | |
| 2249 exceptionInfo->ContextRecord); | |
| 2250 } | |
| 2251 break; | |
| 2252 default: | |
| 2253 break; | |
| 2254 } | |
| 2255 #endif | |
| 2256 } | |
| 2257 return EXCEPTION_CONTINUE_SEARCH; | |
| 2258 } | |
| 2259 | |
| 2260 #ifndef _WIN64 | |
| 2261 // Special care for fast JNI accessors. | |
| 2262 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and | |
| 2263 // the heap gets shrunk before the field access. | |
| 2264 // Need to install our own structured exception handler since native code may | |
| 2265 // install its own. | |
| 2266 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { | |
| 2267 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; | |
| 2268 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { | |
| 2269 address pc = (address) exceptionInfo->ContextRecord->Eip; | |
| 2270 address addr = JNI_FastGetField::find_slowcase_pc(pc); | |
| 2271 if (addr != (address)-1) { | |
| 2272 return Handle_Exception(exceptionInfo, addr); | |
| 2273 } | |
| 2274 } | |
| 2275 return EXCEPTION_CONTINUE_SEARCH; | |
| 2276 } | |
| 2277 | |
| 2278 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \ | |
| 2279 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \ | |
| 2280 __try { \ | |
| 2281 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \ | |
| 2282 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \ | |
| 2283 } \ | |
| 2284 return 0; \ | |
| 2285 } | |
| 2286 | |
| 2287 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) | |
| 2288 DEFINE_FAST_GETFIELD(jbyte, byte, Byte) | |
| 2289 DEFINE_FAST_GETFIELD(jchar, char, Char) | |
| 2290 DEFINE_FAST_GETFIELD(jshort, short, Short) | |
| 2291 DEFINE_FAST_GETFIELD(jint, int, Int) | |
| 2292 DEFINE_FAST_GETFIELD(jlong, long, Long) | |
| 2293 DEFINE_FAST_GETFIELD(jfloat, float, Float) | |
| 2294 DEFINE_FAST_GETFIELD(jdouble, double, Double) | |
| 2295 | |
| 2296 address os::win32::fast_jni_accessor_wrapper(BasicType type) { | |
| 2297 switch (type) { | |
| 2298 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; | |
| 2299 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; | |
| 2300 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; | |
| 2301 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; | |
| 2302 case T_INT: return (address)jni_fast_GetIntField_wrapper; | |
| 2303 case T_LONG: return (address)jni_fast_GetLongField_wrapper; | |
| 2304 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; | |
| 2305 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; | |
| 2306 default: ShouldNotReachHere(); | |
| 2307 } | |
| 2308 return (address)-1; | |
| 2309 } | |
| 2310 #endif | |
| 2311 | |
| 2312 // Virtual Memory | |
| 2313 | |
| 2314 int os::vm_page_size() { return os::win32::vm_page_size(); } | |
| 2315 int os::vm_allocation_granularity() { | |
| 2316 return os::win32::vm_allocation_granularity(); | |
| 2317 } | |
| 2318 | |
| 2319 // Windows large page support is available on Windows 2003. In order to use | |
| 2320 // large page memory, the administrator must first assign additional privilege | |
| 2321 // to the user: | |
| 2322 // + select Control Panel -> Administrative Tools -> Local Security Policy | |
| 2323 // + select Local Policies -> User Rights Assignment | |
| 2324 // + double click "Lock pages in memory", add users and/or groups | |
| 2325 // + reboot | |
| 2326 // Note the above steps are needed for administrator as well, as administrators | |
| 2327 // by default do not have the privilege to lock pages in memory. | |
| 2328 // | |
| 2329 // Note about Windows 2003: although the API supports committing large page | |
| 2330 // memory on a page-by-page basis and VirtualAlloc() returns success under this | |
| 2331 // scenario, I found through experiment it only uses large page if the entire | |
| 2332 // memory region is reserved and committed in a single VirtualAlloc() call. | |
| 2333 // This makes Windows large page support more or less like Solaris ISM, in | |
| 2334 // that the entire heap must be committed upfront. This probably will change | |
| 2335 // in the future, if so the code below needs to be revisited. | |
| 2336 | |
| 2337 #ifndef MEM_LARGE_PAGES | |
| 2338 #define MEM_LARGE_PAGES 0x20000000 | |
| 2339 #endif | |
| 2340 | |
| 2341 // GetLargePageMinimum is only available on Windows 2003. The other functions | |
| 2342 // are available on NT but not on Windows 98/Me. We have to resolve them at | |
| 2343 // runtime. | |
| 2344 typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void); | |
| 2345 typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type) | |
| 2346 (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); | |
| 2347 typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE); | |
| 2348 typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID); | |
| 2349 | |
| 2350 static GetLargePageMinimum_func_type _GetLargePageMinimum; | |
| 2351 static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges; | |
| 2352 static OpenProcessToken_func_type _OpenProcessToken; | |
| 2353 static LookupPrivilegeValue_func_type _LookupPrivilegeValue; | |
| 2354 | |
| 2355 static HINSTANCE _kernel32; | |
| 2356 static HINSTANCE _advapi32; | |
| 2357 static HANDLE _hProcess; | |
| 2358 static HANDLE _hToken; | |
| 2359 | |
| 2360 static size_t _large_page_size = 0; | |
| 2361 | |
| 2362 static bool resolve_functions_for_large_page_init() { | |
| 2363 _kernel32 = LoadLibrary("kernel32.dll"); | |
| 2364 if (_kernel32 == NULL) return false; | |
| 2365 | |
| 2366 _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type, | |
| 2367 GetProcAddress(_kernel32, "GetLargePageMinimum")); | |
| 2368 if (_GetLargePageMinimum == NULL) return false; | |
| 2369 | |
| 2370 _advapi32 = LoadLibrary("advapi32.dll"); | |
| 2371 if (_advapi32 == NULL) return false; | |
| 2372 | |
| 2373 _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type, | |
| 2374 GetProcAddress(_advapi32, "AdjustTokenPrivileges")); | |
| 2375 _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type, | |
| 2376 GetProcAddress(_advapi32, "OpenProcessToken")); | |
| 2377 _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type, | |
| 2378 GetProcAddress(_advapi32, "LookupPrivilegeValueA")); | |
| 2379 return _AdjustTokenPrivileges != NULL && | |
| 2380 _OpenProcessToken != NULL && | |
| 2381 _LookupPrivilegeValue != NULL; | |
| 2382 } | |
| 2383 | |
| 2384 static bool request_lock_memory_privilege() { | |
| 2385 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, | |
| 2386 os::current_process_id()); | |
| 2387 | |
| 2388 LUID luid; | |
| 2389 if (_hProcess != NULL && | |
| 2390 _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && | |
| 2391 _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { | |
| 2392 | |
| 2393 TOKEN_PRIVILEGES tp; | |
| 2394 tp.PrivilegeCount = 1; | |
| 2395 tp.Privileges[0].Luid = luid; | |
| 2396 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; | |
| 2397 | |
| 2398 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the | |
| 2399 // privilege. Check GetLastError() too. See MSDN document. | |
| 2400 if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && | |
| 2401 (GetLastError() == ERROR_SUCCESS)) { | |
| 2402 return true; | |
| 2403 } | |
| 2404 } | |
| 2405 | |
| 2406 return false; | |
| 2407 } | |
| 2408 | |
| 2409 static void cleanup_after_large_page_init() { | |
| 2410 _GetLargePageMinimum = NULL; | |
| 2411 _AdjustTokenPrivileges = NULL; | |
| 2412 _OpenProcessToken = NULL; | |
| 2413 _LookupPrivilegeValue = NULL; | |
| 2414 if (_kernel32) FreeLibrary(_kernel32); | |
| 2415 _kernel32 = NULL; | |
| 2416 if (_advapi32) FreeLibrary(_advapi32); | |
| 2417 _advapi32 = NULL; | |
| 2418 if (_hProcess) CloseHandle(_hProcess); | |
| 2419 _hProcess = NULL; | |
| 2420 if (_hToken) CloseHandle(_hToken); | |
| 2421 _hToken = NULL; | |
| 2422 } | |
| 2423 | |
| 2424 bool os::large_page_init() { | |
| 2425 if (!UseLargePages) return false; | |
| 2426 | |
| 2427 // print a warning if any large page related flag is specified on command line | |
| 2428 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || | |
| 2429 !FLAG_IS_DEFAULT(LargePageSizeInBytes); | |
| 2430 bool success = false; | |
| 2431 | |
| 2432 # define WARN(msg) if (warn_on_failure) { warning(msg); } | |
| 2433 if (resolve_functions_for_large_page_init()) { | |
| 2434 if (request_lock_memory_privilege()) { | |
| 2435 size_t s = _GetLargePageMinimum(); | |
| 2436 if (s) { | |
| 2437 #if defined(IA32) || defined(AMD64) | |
| 2438 if (s > 4*M || LargePageSizeInBytes > 4*M) { | |
| 2439 WARN("JVM cannot use large pages bigger than 4mb."); | |
| 2440 } else { | |
| 2441 #endif | |
| 2442 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { | |
| 2443 _large_page_size = LargePageSizeInBytes; | |
| 2444 } else { | |
| 2445 _large_page_size = s; | |
| 2446 } | |
| 2447 success = true; | |
| 2448 #if defined(IA32) || defined(AMD64) | |
| 2449 } | |
| 2450 #endif | |
| 2451 } else { | |
| 2452 WARN("Large page is not supported by the processor."); | |
| 2453 } | |
| 2454 } else { | |
| 2455 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); | |
| 2456 } | |
| 2457 } else { | |
| 2458 WARN("Large page is not supported by the operating system."); | |
| 2459 } | |
| 2460 #undef WARN | |
| 2461 | |
| 2462 const size_t default_page_size = (size_t) vm_page_size(); | |
| 2463 if (success && _large_page_size > default_page_size) { | |
| 2464 _page_sizes[0] = _large_page_size; | |
| 2465 _page_sizes[1] = default_page_size; | |
| 2466 _page_sizes[2] = 0; | |
| 2467 } | |
| 2468 | |
| 2469 cleanup_after_large_page_init(); | |
| 2470 return success; | |
| 2471 } | |
| 2472 | |
| 2473 // On win32, one cannot release just a part of reserved memory, it's an | |
| 2474 // all or nothing deal. When we split a reservation, we must break the | |
| 2475 // reservation into two reservations. | |
| 2476 void os::split_reserved_memory(char *base, size_t size, size_t split, | |
| 2477 bool realloc) { | |
| 2478 if (size > 0) { | |
| 2479 release_memory(base, size); | |
| 2480 if (realloc) { | |
| 2481 reserve_memory(split, base); | |
| 2482 } | |
| 2483 if (size != split) { | |
| 2484 reserve_memory(size - split, base + split); | |
| 2485 } | |
| 2486 } | |
| 2487 } | |
| 2488 | |
| 2489 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { | |
| 2490 assert((size_t)addr % os::vm_allocation_granularity() == 0, | |
| 2491 "reserve alignment"); | |
| 2492 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size"); | |
| 2493 char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, | |
| 2494 PAGE_EXECUTE_READWRITE); | |
| 2495 assert(res == NULL || addr == NULL || addr == res, | |
| 2496 "Unexpected address from reserve."); | |
| 2497 return res; | |
| 2498 } | |
| 2499 | |
| 2500 // Reserve memory at an arbitrary address, only if that area is | |
| 2501 // available (and not reserved for something else). | |
| 2502 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) { | |
| 2503 // Windows os::reserve_memory() fails of the requested address range is | |
| 2504 // not avilable. | |
| 2505 return reserve_memory(bytes, requested_addr); | |
| 2506 } | |
| 2507 | |
| 2508 size_t os::large_page_size() { | |
| 2509 return _large_page_size; | |
| 2510 } | |
| 2511 | |
| 2512 bool os::can_commit_large_page_memory() { | |
| 2513 // Windows only uses large page memory when the entire region is reserved | |
| 2514 // and committed in a single VirtualAlloc() call. This may change in the | |
| 2515 // future, but with Windows 2003 it's not possible to commit on demand. | |
| 2516 return false; | |
| 2517 } | |
| 2518 | |
|
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2519 bool os::can_execute_large_page_memory() { |
|
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2520 return true; |
|
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2521 } |
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2522 |
| 0 | 2523 char* os::reserve_memory_special(size_t bytes) { |
| 2524 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; | |
|
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2525 char * res = (char *)VirtualAlloc(NULL, bytes, flag, PAGE_EXECUTE_READWRITE); |
| 0 | 2526 return res; |
| 2527 } | |
| 2528 | |
| 2529 bool os::release_memory_special(char* base, size_t bytes) { | |
| 2530 return release_memory(base, bytes); | |
| 2531 } | |
| 2532 | |
| 2533 void os::print_statistics() { | |
| 2534 } | |
| 2535 | |
| 2536 bool os::commit_memory(char* addr, size_t bytes) { | |
| 2537 if (bytes == 0) { | |
| 2538 // Don't bother the OS with noops. | |
| 2539 return true; | |
| 2540 } | |
| 2541 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); | |
| 2542 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); | |
| 2543 // Don't attempt to print anything if the OS call fails. We're | |
| 2544 // probably low on resources, so the print itself may cause crashes. | |
| 2545 return VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_EXECUTE_READWRITE) != NULL; | |
| 2546 } | |
| 2547 | |
| 2548 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint) { | |
| 2549 return commit_memory(addr, size); | |
| 2550 } | |
| 2551 | |
| 2552 bool os::uncommit_memory(char* addr, size_t bytes) { | |
| 2553 if (bytes == 0) { | |
| 2554 // Don't bother the OS with noops. | |
| 2555 return true; | |
| 2556 } | |
| 2557 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); | |
| 2558 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); | |
| 2559 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0; | |
| 2560 } | |
| 2561 | |
| 2562 bool os::release_memory(char* addr, size_t bytes) { | |
| 2563 return VirtualFree(addr, 0, MEM_RELEASE) != 0; | |
| 2564 } | |
| 2565 | |
| 2566 bool os::protect_memory(char* addr, size_t bytes) { | |
| 2567 DWORD old_status; | |
| 2568 return VirtualProtect(addr, bytes, PAGE_READONLY, &old_status) != 0; | |
| 2569 } | |
| 2570 | |
| 2571 bool os::guard_memory(char* addr, size_t bytes) { | |
| 2572 DWORD old_status; | |
| 2573 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE | PAGE_GUARD, &old_status) != 0; | |
| 2574 } | |
| 2575 | |
| 2576 bool os::unguard_memory(char* addr, size_t bytes) { | |
| 2577 DWORD old_status; | |
| 2578 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &old_status) != 0; | |
| 2579 } | |
| 2580 | |
| 2581 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } | |
| 2582 void os::free_memory(char *addr, size_t bytes) { } | |
| 2583 void os::numa_make_global(char *addr, size_t bytes) { } | |
| 141 | 2584 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } |
| 0 | 2585 bool os::numa_topology_changed() { return false; } |
| 2586 size_t os::numa_get_groups_num() { return 1; } | |
| 2587 int os::numa_get_group_id() { return 0; } | |
| 2588 size_t os::numa_get_leaf_groups(int *ids, size_t size) { | |
| 2589 if (size > 0) { | |
| 2590 ids[0] = 0; | |
| 2591 return 1; | |
| 2592 } | |
| 2593 return 0; | |
| 2594 } | |
| 2595 | |
| 2596 bool os::get_page_info(char *start, page_info* info) { | |
| 2597 return false; | |
| 2598 } | |
| 2599 | |
| 2600 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
| 2601 return end; | |
| 2602 } | |
| 2603 | |
| 2604 char* os::non_memory_address_word() { | |
| 2605 // Must never look like an address returned by reserve_memory, | |
| 2606 // even in its subfields (as defined by the CPU immediate fields, | |
| 2607 // if the CPU splits constants across multiple instructions). | |
| 2608 return (char*)-1; | |
| 2609 } | |
| 2610 | |
| 2611 #define MAX_ERROR_COUNT 100 | |
| 2612 #define SYS_THREAD_ERROR 0xffffffffUL | |
| 2613 | |
| 2614 void os::pd_start_thread(Thread* thread) { | |
| 2615 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); | |
| 2616 // Returns previous suspend state: | |
| 2617 // 0: Thread was not suspended | |
| 2618 // 1: Thread is running now | |
| 2619 // >1: Thread is still suspended. | |
| 2620 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back | |
| 2621 } | |
| 2622 | |
| 2623 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
| 2624 return ::read(fd, buf, nBytes); | |
| 2625 } | |
| 2626 | |
| 2627 class HighResolutionInterval { | |
| 2628 // The default timer resolution seems to be 10 milliseconds. | |
| 2629 // (Where is this written down?) | |
| 2630 // If someone wants to sleep for only a fraction of the default, | |
| 2631 // then we set the timer resolution down to 1 millisecond for | |
| 2632 // the duration of their interval. | |
| 2633 // We carefully set the resolution back, since otherwise we | |
| 2634 // seem to incur an overhead (3%?) that we don't need. | |
| 2635 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. | |
| 2636 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). | |
| 2637 // Alternatively, we could compute the relative error (503/500 = .6%) and only use | |
| 2638 // timeBeginPeriod() if the relative error exceeded some threshold. | |
| 2639 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and | |
| 2640 // to decreased efficiency related to increased timer "tick" rates. We want to minimize | |
| 2641 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high | |
| 2642 // resolution timers running. | |
| 2643 private: | |
| 2644 jlong resolution; | |
| 2645 public: | |
| 2646 HighResolutionInterval(jlong ms) { | |
| 2647 resolution = ms % 10L; | |
| 2648 if (resolution != 0) { | |
| 2649 MMRESULT result = timeBeginPeriod(1L); | |
| 2650 } | |
| 2651 } | |
| 2652 ~HighResolutionInterval() { | |
| 2653 if (resolution != 0) { | |
| 2654 MMRESULT result = timeEndPeriod(1L); | |
| 2655 } | |
| 2656 resolution = 0L; | |
| 2657 } | |
| 2658 }; | |
| 2659 | |
| 2660 int os::sleep(Thread* thread, jlong ms, bool interruptable) { | |
| 2661 jlong limit = (jlong) MAXDWORD; | |
| 2662 | |
| 2663 while(ms > limit) { | |
| 2664 int res; | |
| 2665 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) | |
| 2666 return res; | |
| 2667 ms -= limit; | |
| 2668 } | |
| 2669 | |
| 2670 assert(thread == Thread::current(), "thread consistency check"); | |
| 2671 OSThread* osthread = thread->osthread(); | |
| 2672 OSThreadWaitState osts(osthread, false /* not Object.wait() */); | |
| 2673 int result; | |
| 2674 if (interruptable) { | |
| 2675 assert(thread->is_Java_thread(), "must be java thread"); | |
| 2676 JavaThread *jt = (JavaThread *) thread; | |
| 2677 ThreadBlockInVM tbivm(jt); | |
| 2678 | |
| 2679 jt->set_suspend_equivalent(); | |
| 2680 // cleared by handle_special_suspend_equivalent_condition() or | |
| 2681 // java_suspend_self() via check_and_wait_while_suspended() | |
| 2682 | |
| 2683 HANDLE events[1]; | |
| 2684 events[0] = osthread->interrupt_event(); | |
| 2685 HighResolutionInterval *phri=NULL; | |
| 2686 if(!ForceTimeHighResolution) | |
| 2687 phri = new HighResolutionInterval( ms ); | |
| 2688 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { | |
| 2689 result = OS_TIMEOUT; | |
| 2690 } else { | |
| 2691 ResetEvent(osthread->interrupt_event()); | |
| 2692 osthread->set_interrupted(false); | |
| 2693 result = OS_INTRPT; | |
| 2694 } | |
| 2695 delete phri; //if it is NULL, harmless | |
| 2696 | |
| 2697 // were we externally suspended while we were waiting? | |
| 2698 jt->check_and_wait_while_suspended(); | |
| 2699 } else { | |
| 2700 assert(!thread->is_Java_thread(), "must not be java thread"); | |
| 2701 Sleep((long) ms); | |
| 2702 result = OS_TIMEOUT; | |
| 2703 } | |
| 2704 return result; | |
| 2705 } | |
| 2706 | |
| 2707 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
| 2708 void os::infinite_sleep() { | |
| 2709 while (true) { // sleep forever ... | |
| 2710 Sleep(100000); // ... 100 seconds at a time | |
| 2711 } | |
| 2712 } | |
| 2713 | |
| 2714 typedef BOOL (WINAPI * STTSignature)(void) ; | |
| 2715 | |
| 2716 os::YieldResult os::NakedYield() { | |
| 2717 // Use either SwitchToThread() or Sleep(0) | |
| 2718 // Consider passing back the return value from SwitchToThread(). | |
| 2719 // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread. | |
| 2720 // In that case we revert to Sleep(0). | |
| 2721 static volatile STTSignature stt = (STTSignature) 1 ; | |
| 2722 | |
| 2723 if (stt == ((STTSignature) 1)) { | |
| 2724 stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ; | |
| 2725 // It's OK if threads race during initialization as the operation above is idempotent. | |
| 2726 } | |
| 2727 if (stt != NULL) { | |
| 2728 return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ; | |
| 2729 } else { | |
| 2730 Sleep (0) ; | |
| 2731 } | |
| 2732 return os::YIELD_UNKNOWN ; | |
| 2733 } | |
| 2734 | |
| 2735 void os::yield() { os::NakedYield(); } | |
| 2736 | |
| 2737 void os::yield_all(int attempts) { | |
| 2738 // Yields to all threads, including threads with lower priorities | |
| 2739 Sleep(1); | |
| 2740 } | |
| 2741 | |
| 2742 // Win32 only gives you access to seven real priorities at a time, | |
| 2743 // so we compress Java's ten down to seven. It would be better | |
| 2744 // if we dynamically adjusted relative priorities. | |
| 2745 | |
| 2746 int os::java_to_os_priority[MaxPriority + 1] = { | |
| 2747 THREAD_PRIORITY_IDLE, // 0 Entry should never be used | |
| 2748 THREAD_PRIORITY_LOWEST, // 1 MinPriority | |
| 2749 THREAD_PRIORITY_LOWEST, // 2 | |
| 2750 THREAD_PRIORITY_BELOW_NORMAL, // 3 | |
| 2751 THREAD_PRIORITY_BELOW_NORMAL, // 4 | |
| 2752 THREAD_PRIORITY_NORMAL, // 5 NormPriority | |
| 2753 THREAD_PRIORITY_NORMAL, // 6 | |
| 2754 THREAD_PRIORITY_ABOVE_NORMAL, // 7 | |
| 2755 THREAD_PRIORITY_ABOVE_NORMAL, // 8 | |
| 2756 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority | |
| 2757 THREAD_PRIORITY_HIGHEST // 10 MaxPriority | |
| 2758 }; | |
| 2759 | |
| 2760 int prio_policy1[MaxPriority + 1] = { | |
| 2761 THREAD_PRIORITY_IDLE, // 0 Entry should never be used | |
| 2762 THREAD_PRIORITY_LOWEST, // 1 MinPriority | |
| 2763 THREAD_PRIORITY_LOWEST, // 2 | |
| 2764 THREAD_PRIORITY_BELOW_NORMAL, // 3 | |
| 2765 THREAD_PRIORITY_BELOW_NORMAL, // 4 | |
| 2766 THREAD_PRIORITY_NORMAL, // 5 NormPriority | |
| 2767 THREAD_PRIORITY_ABOVE_NORMAL, // 6 | |
| 2768 THREAD_PRIORITY_ABOVE_NORMAL, // 7 | |
| 2769 THREAD_PRIORITY_HIGHEST, // 8 | |
| 2770 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority | |
| 2771 THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority | |
| 2772 }; | |
| 2773 | |
| 2774 static int prio_init() { | |
| 2775 // If ThreadPriorityPolicy is 1, switch tables | |
| 2776 if (ThreadPriorityPolicy == 1) { | |
| 2777 int i; | |
| 2778 for (i = 0; i < MaxPriority + 1; i++) { | |
| 2779 os::java_to_os_priority[i] = prio_policy1[i]; | |
| 2780 } | |
| 2781 } | |
| 2782 return 0; | |
| 2783 } | |
| 2784 | |
| 2785 OSReturn os::set_native_priority(Thread* thread, int priority) { | |
| 2786 if (!UseThreadPriorities) return OS_OK; | |
| 2787 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; | |
| 2788 return ret ? OS_OK : OS_ERR; | |
| 2789 } | |
| 2790 | |
| 2791 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) { | |
| 2792 if ( !UseThreadPriorities ) { | |
| 2793 *priority_ptr = java_to_os_priority[NormPriority]; | |
| 2794 return OS_OK; | |
| 2795 } | |
| 2796 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); | |
| 2797 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { | |
| 2798 assert(false, "GetThreadPriority failed"); | |
| 2799 return OS_ERR; | |
| 2800 } | |
| 2801 *priority_ptr = os_prio; | |
| 2802 return OS_OK; | |
| 2803 } | |
| 2804 | |
| 2805 | |
| 2806 // Hint to the underlying OS that a task switch would not be good. | |
| 2807 // Void return because it's a hint and can fail. | |
| 2808 void os::hint_no_preempt() {} | |
| 2809 | |
| 2810 void os::interrupt(Thread* thread) { | |
| 2811 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 2812 "possibility of dangling Thread pointer"); | |
| 2813 | |
| 2814 OSThread* osthread = thread->osthread(); | |
| 2815 osthread->set_interrupted(true); | |
| 2816 // More than one thread can get here with the same value of osthread, | |
| 2817 // resulting in multiple notifications. We do, however, want the store | |
| 2818 // to interrupted() to be visible to other threads before we post | |
| 2819 // the interrupt event. | |
| 2820 OrderAccess::release(); | |
| 2821 SetEvent(osthread->interrupt_event()); | |
| 2822 // For JSR166: unpark after setting status | |
| 2823 if (thread->is_Java_thread()) | |
| 2824 ((JavaThread*)thread)->parker()->unpark(); | |
| 2825 | |
| 2826 ParkEvent * ev = thread->_ParkEvent ; | |
| 2827 if (ev != NULL) ev->unpark() ; | |
| 2828 | |
| 2829 } | |
| 2830 | |
| 2831 | |
| 2832 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 2833 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 2834 "possibility of dangling Thread pointer"); | |
| 2835 | |
| 2836 OSThread* osthread = thread->osthread(); | |
| 2837 bool interrupted; | |
| 2838 interrupted = osthread->interrupted(); | |
| 2839 if (clear_interrupted == true) { | |
| 2840 osthread->set_interrupted(false); | |
| 2841 ResetEvent(osthread->interrupt_event()); | |
| 2842 } // Otherwise leave the interrupted state alone | |
| 2843 | |
| 2844 return interrupted; | |
| 2845 } | |
| 2846 | |
| 2847 // Get's a pc (hint) for a running thread. Currently used only for profiling. | |
| 2848 ExtendedPC os::get_thread_pc(Thread* thread) { | |
| 2849 CONTEXT context; | |
| 2850 context.ContextFlags = CONTEXT_CONTROL; | |
| 2851 HANDLE handle = thread->osthread()->thread_handle(); | |
| 2852 #ifdef _M_IA64 | |
| 2853 assert(0, "Fix get_thread_pc"); | |
| 2854 return ExtendedPC(NULL); | |
| 2855 #else | |
| 2856 if (GetThreadContext(handle, &context)) { | |
| 2857 #ifdef _M_AMD64 | |
| 2858 return ExtendedPC((address) context.Rip); | |
| 2859 #else | |
| 2860 return ExtendedPC((address) context.Eip); | |
| 2861 #endif | |
| 2862 } else { | |
| 2863 return ExtendedPC(NULL); | |
| 2864 } | |
| 2865 #endif | |
| 2866 } | |
| 2867 | |
| 2868 // GetCurrentThreadId() returns DWORD | |
| 2869 intx os::current_thread_id() { return GetCurrentThreadId(); } | |
| 2870 | |
| 2871 static int _initial_pid = 0; | |
| 2872 | |
| 2873 int os::current_process_id() | |
| 2874 { | |
| 2875 return (_initial_pid ? _initial_pid : _getpid()); | |
| 2876 } | |
| 2877 | |
| 2878 int os::win32::_vm_page_size = 0; | |
| 2879 int os::win32::_vm_allocation_granularity = 0; | |
| 2880 int os::win32::_processor_type = 0; | |
| 2881 // Processor level is not available on non-NT systems, use vm_version instead | |
| 2882 int os::win32::_processor_level = 0; | |
| 2883 julong os::win32::_physical_memory = 0; | |
| 2884 size_t os::win32::_default_stack_size = 0; | |
| 2885 | |
| 2886 intx os::win32::_os_thread_limit = 0; | |
| 2887 volatile intx os::win32::_os_thread_count = 0; | |
| 2888 | |
| 2889 bool os::win32::_is_nt = false; | |
| 2890 | |
| 2891 | |
| 2892 void os::win32::initialize_system_info() { | |
| 2893 SYSTEM_INFO si; | |
| 2894 GetSystemInfo(&si); | |
| 2895 _vm_page_size = si.dwPageSize; | |
| 2896 _vm_allocation_granularity = si.dwAllocationGranularity; | |
| 2897 _processor_type = si.dwProcessorType; | |
| 2898 _processor_level = si.wProcessorLevel; | |
| 2899 _processor_count = si.dwNumberOfProcessors; | |
| 2900 | |
| 2901 MEMORYSTATUS ms; | |
| 2902 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, | |
| 2903 // dwMemoryLoad (% of memory in use) | |
| 2904 GlobalMemoryStatus(&ms); | |
| 2905 _physical_memory = ms.dwTotalPhys; | |
| 2906 | |
| 2907 OSVERSIONINFO oi; | |
| 2908 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); | |
| 2909 GetVersionEx(&oi); | |
| 2910 switch(oi.dwPlatformId) { | |
| 2911 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; | |
| 2912 case VER_PLATFORM_WIN32_NT: _is_nt = true; break; | |
| 2913 default: fatal("Unknown platform"); | |
| 2914 } | |
| 2915 | |
| 2916 _default_stack_size = os::current_stack_size(); | |
| 2917 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); | |
| 2918 assert((_default_stack_size & (_vm_page_size - 1)) == 0, | |
| 2919 "stack size not a multiple of page size"); | |
| 2920 | |
| 2921 initialize_performance_counter(); | |
| 2922 | |
| 2923 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is | |
| 2924 // known to deadlock the system, if the VM issues to thread operations with | |
| 2925 // a too high frequency, e.g., such as changing the priorities. | |
| 2926 // The 6000 seems to work well - no deadlocks has been notices on the test | |
| 2927 // programs that we have seen experience this problem. | |
| 2928 if (!os::win32::is_nt()) { | |
| 2929 StarvationMonitorInterval = 6000; | |
| 2930 } | |
| 2931 } | |
| 2932 | |
| 2933 | |
| 2934 void os::win32::setmode_streams() { | |
| 2935 _setmode(_fileno(stdin), _O_BINARY); | |
| 2936 _setmode(_fileno(stdout), _O_BINARY); | |
| 2937 _setmode(_fileno(stderr), _O_BINARY); | |
| 2938 } | |
| 2939 | |
| 2940 | |
| 2941 int os::message_box(const char* title, const char* message) { | |
| 2942 int result = MessageBox(NULL, message, title, | |
| 2943 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); | |
| 2944 return result == IDYES; | |
| 2945 } | |
| 2946 | |
| 2947 int os::allocate_thread_local_storage() { | |
| 2948 return TlsAlloc(); | |
| 2949 } | |
| 2950 | |
| 2951 | |
| 2952 void os::free_thread_local_storage(int index) { | |
| 2953 TlsFree(index); | |
| 2954 } | |
| 2955 | |
| 2956 | |
| 2957 void os::thread_local_storage_at_put(int index, void* value) { | |
| 2958 TlsSetValue(index, value); | |
| 2959 assert(thread_local_storage_at(index) == value, "Just checking"); | |
| 2960 } | |
| 2961 | |
| 2962 | |
| 2963 void* os::thread_local_storage_at(int index) { | |
| 2964 return TlsGetValue(index); | |
| 2965 } | |
| 2966 | |
| 2967 | |
| 2968 #ifndef PRODUCT | |
| 2969 #ifndef _WIN64 | |
| 2970 // Helpers to check whether NX protection is enabled | |
| 2971 int nx_exception_filter(_EXCEPTION_POINTERS *pex) { | |
| 2972 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && | |
| 2973 pex->ExceptionRecord->NumberParameters > 0 && | |
| 2974 pex->ExceptionRecord->ExceptionInformation[0] == | |
| 2975 EXCEPTION_INFO_EXEC_VIOLATION) { | |
| 2976 return EXCEPTION_EXECUTE_HANDLER; | |
| 2977 } | |
| 2978 return EXCEPTION_CONTINUE_SEARCH; | |
| 2979 } | |
| 2980 | |
| 2981 void nx_check_protection() { | |
| 2982 // If NX is enabled we'll get an exception calling into code on the stack | |
| 2983 char code[] = { (char)0xC3 }; // ret | |
| 2984 void *code_ptr = (void *)code; | |
| 2985 __try { | |
| 2986 __asm call code_ptr | |
| 2987 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { | |
| 2988 tty->print_raw_cr("NX protection detected."); | |
| 2989 } | |
| 2990 } | |
| 2991 #endif // _WIN64 | |
| 2992 #endif // PRODUCT | |
| 2993 | |
| 2994 // this is called _before_ the global arguments have been parsed | |
| 2995 void os::init(void) { | |
| 2996 _initial_pid = _getpid(); | |
| 2997 | |
| 2998 init_random(1234567); | |
| 2999 | |
| 3000 win32::initialize_system_info(); | |
| 3001 win32::setmode_streams(); | |
| 3002 init_page_sizes((size_t) win32::vm_page_size()); | |
| 3003 | |
| 3004 // For better scalability on MP systems (must be called after initialize_system_info) | |
| 3005 #ifndef PRODUCT | |
| 3006 if (is_MP()) { | |
| 3007 NoYieldsInMicrolock = true; | |
| 3008 } | |
| 3009 #endif | |
| 3010 // Initialize main_process and main_thread | |
| 3011 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle | |
| 3012 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, | |
| 3013 &main_thread, THREAD_ALL_ACCESS, false, 0)) { | |
| 3014 fatal("DuplicateHandle failed\n"); | |
| 3015 } | |
| 3016 main_thread_id = (int) GetCurrentThreadId(); | |
| 3017 } | |
| 3018 | |
| 3019 // To install functions for atexit processing | |
| 3020 extern "C" { | |
| 3021 static void perfMemory_exit_helper() { | |
| 3022 perfMemory_exit(); | |
| 3023 } | |
| 3024 } | |
| 3025 | |
| 3026 | |
| 3027 // this is called _after_ the global arguments have been parsed | |
| 3028 jint os::init_2(void) { | |
| 3029 // Allocate a single page and mark it as readable for safepoint polling | |
| 3030 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); | |
| 3031 guarantee( polling_page != NULL, "Reserve Failed for polling page"); | |
| 3032 | |
| 3033 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); | |
| 3034 guarantee( return_page != NULL, "Commit Failed for polling page"); | |
| 3035 | |
| 3036 os::set_polling_page( polling_page ); | |
| 3037 | |
| 3038 #ifndef PRODUCT | |
| 3039 if( Verbose && PrintMiscellaneous ) | |
| 3040 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
| 3041 #endif | |
| 3042 | |
| 3043 if (!UseMembar) { | |
| 3044 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_EXECUTE_READWRITE); | |
| 3045 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); | |
| 3046 | |
| 3047 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_EXECUTE_READWRITE); | |
| 3048 guarantee( return_page != NULL, "Commit Failed for memory serialize page"); | |
| 3049 | |
| 3050 os::set_memory_serialize_page( mem_serialize_page ); | |
| 3051 | |
| 3052 #ifndef PRODUCT | |
| 3053 if(Verbose && PrintMiscellaneous) | |
| 3054 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
| 3055 #endif | |
| 3056 } | |
| 3057 | |
| 3058 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init()); | |
| 3059 | |
| 3060 // Setup Windows Exceptions | |
| 3061 | |
| 3062 // On Itanium systems, Structured Exception Handling does not | |
| 3063 // work since stack frames must be walkable by the OS. Since | |
| 3064 // much of our code is dynamically generated, and we do not have | |
| 3065 // proper unwind .xdata sections, the system simply exits | |
| 3066 // rather than delivering the exception. To work around | |
| 3067 // this we use VectorExceptions instead. | |
| 3068 #ifdef _WIN64 | |
| 3069 if (UseVectoredExceptions) { | |
| 3070 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter); | |
| 3071 } | |
| 3072 #endif | |
| 3073 | |
| 3074 // for debugging float code generation bugs | |
| 3075 if (ForceFloatExceptions) { | |
| 3076 #ifndef _WIN64 | |
| 3077 static long fp_control_word = 0; | |
| 3078 __asm { fstcw fp_control_word } | |
| 3079 // see Intel PPro Manual, Vol. 2, p 7-16 | |
| 3080 const long precision = 0x20; | |
| 3081 const long underflow = 0x10; | |
| 3082 const long overflow = 0x08; | |
| 3083 const long zero_div = 0x04; | |
| 3084 const long denorm = 0x02; | |
| 3085 const long invalid = 0x01; | |
| 3086 fp_control_word |= invalid; | |
| 3087 __asm { fldcw fp_control_word } | |
| 3088 #endif | |
| 3089 } | |
| 3090 | |
| 3091 // Initialize HPI. | |
| 3092 jint hpi_result = hpi::initialize(); | |
| 3093 if (hpi_result != JNI_OK) { return hpi_result; } | |
| 3094 | |
| 3095 // If stack_commit_size is 0, windows will reserve the default size, | |
| 3096 // but only commit a small portion of it. | |
| 3097 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); | |
| 3098 size_t default_reserve_size = os::win32::default_stack_size(); | |
| 3099 size_t actual_reserve_size = stack_commit_size; | |
| 3100 if (stack_commit_size < default_reserve_size) { | |
| 3101 // If stack_commit_size == 0, we want this too | |
| 3102 actual_reserve_size = default_reserve_size; | |
| 3103 } | |
| 3104 | |
| 3105 JavaThread::set_stack_size_at_create(stack_commit_size); | |
| 3106 | |
| 3107 // Calculate theoretical max. size of Threads to guard gainst artifical | |
| 3108 // out-of-memory situations, where all available address-space has been | |
| 3109 // reserved by thread stacks. | |
| 3110 assert(actual_reserve_size != 0, "Must have a stack"); | |
| 3111 | |
| 3112 // Calculate the thread limit when we should start doing Virtual Memory | |
| 3113 // banging. Currently when the threads will have used all but 200Mb of space. | |
| 3114 // | |
| 3115 // TODO: consider performing a similar calculation for commit size instead | |
| 3116 // as reserve size, since on a 64-bit platform we'll run into that more | |
| 3117 // often than running out of virtual memory space. We can use the | |
| 3118 // lower value of the two calculations as the os_thread_limit. | |
|
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changeset
|
3119 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); |
| 0 | 3120 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); |
| 3121 | |
| 3122 // at exit methods are called in the reverse order of their registration. | |
| 3123 // there is no limit to the number of functions registered. atexit does | |
| 3124 // not set errno. | |
| 3125 | |
| 3126 if (PerfAllowAtExitRegistration) { | |
| 3127 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
| 3128 // atexit functions can be delayed until process exit time, which | |
| 3129 // can be problematic for embedded VM situations. Embedded VMs should | |
| 3130 // call DestroyJavaVM() to assure that VM resources are released. | |
| 3131 | |
| 3132 // note: perfMemory_exit_helper atexit function may be removed in | |
| 3133 // the future if the appropriate cleanup code can be added to the | |
| 3134 // VM_Exit VMOperation's doit method. | |
| 3135 if (atexit(perfMemory_exit_helper) != 0) { | |
| 3136 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); | |
| 3137 } | |
| 3138 } | |
| 3139 | |
| 3140 // initialize PSAPI or ToolHelp for fatal error handler | |
| 3141 if (win32::is_nt()) _init_psapi(); | |
| 3142 else _init_toolhelp(); | |
| 3143 | |
| 3144 #ifndef _WIN64 | |
| 3145 // Print something if NX is enabled (win32 on AMD64) | |
| 3146 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); | |
| 3147 #endif | |
| 3148 | |
| 3149 // initialize thread priority policy | |
| 3150 prio_init(); | |
| 3151 | |
| 3152 return JNI_OK; | |
| 3153 } | |
| 3154 | |
| 3155 | |
| 3156 // Mark the polling page as unreadable | |
| 3157 void os::make_polling_page_unreadable(void) { | |
| 3158 DWORD old_status; | |
| 3159 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) ) | |
| 3160 fatal("Could not disable polling page"); | |
| 3161 }; | |
| 3162 | |
| 3163 // Mark the polling page as readable | |
| 3164 void os::make_polling_page_readable(void) { | |
| 3165 DWORD old_status; | |
| 3166 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) ) | |
| 3167 fatal("Could not enable polling page"); | |
| 3168 }; | |
| 3169 | |
| 3170 | |
| 3171 int os::stat(const char *path, struct stat *sbuf) { | |
| 3172 char pathbuf[MAX_PATH]; | |
| 3173 if (strlen(path) > MAX_PATH - 1) { | |
| 3174 errno = ENAMETOOLONG; | |
| 3175 return -1; | |
| 3176 } | |
| 3177 hpi::native_path(strcpy(pathbuf, path)); | |
| 3178 int ret = ::stat(pathbuf, sbuf); | |
| 3179 if (sbuf != NULL && UseUTCFileTimestamp) { | |
| 3180 // Fix for 6539723. st_mtime returned from stat() is dependent on | |
| 3181 // the system timezone and so can return different values for the | |
| 3182 // same file if/when daylight savings time changes. This adjustment | |
| 3183 // makes sure the same timestamp is returned regardless of the TZ. | |
| 3184 // | |
| 3185 // See: | |
| 3186 // http://msdn.microsoft.com/library/ | |
| 3187 // default.asp?url=/library/en-us/sysinfo/base/ | |
| 3188 // time_zone_information_str.asp | |
| 3189 // and | |
| 3190 // http://msdn.microsoft.com/library/default.asp?url= | |
| 3191 // /library/en-us/sysinfo/base/settimezoneinformation.asp | |
| 3192 // | |
| 3193 // NOTE: there is a insidious bug here: If the timezone is changed | |
| 3194 // after the call to stat() but before 'GetTimeZoneInformation()', then | |
| 3195 // the adjustment we do here will be wrong and we'll return the wrong | |
| 3196 // value (which will likely end up creating an invalid class data | |
| 3197 // archive). Absent a better API for this, or some time zone locking | |
| 3198 // mechanism, we'll have to live with this risk. | |
| 3199 TIME_ZONE_INFORMATION tz; | |
| 3200 DWORD tzid = GetTimeZoneInformation(&tz); | |
| 3201 int daylightBias = | |
| 3202 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; | |
| 3203 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; | |
| 3204 } | |
| 3205 return ret; | |
| 3206 } | |
| 3207 | |
| 3208 | |
| 3209 #define FT2INT64(ft) \ | |
| 3210 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) | |
| 3211 | |
| 3212 | |
| 3213 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
| 3214 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
| 3215 // of a thread. | |
| 3216 // | |
| 3217 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
| 3218 // the fast estimate available on the platform. | |
| 3219 | |
| 3220 // current_thread_cpu_time() is not optimized for Windows yet | |
| 3221 jlong os::current_thread_cpu_time() { | |
| 3222 // return user + sys since the cost is the same | |
| 3223 return os::thread_cpu_time(Thread::current(), true /* user+sys */); | |
| 3224 } | |
| 3225 | |
| 3226 jlong os::thread_cpu_time(Thread* thread) { | |
| 3227 // consistent with what current_thread_cpu_time() returns. | |
| 3228 return os::thread_cpu_time(thread, true /* user+sys */); | |
| 3229 } | |
| 3230 | |
| 3231 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
| 3232 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
| 3233 } | |
| 3234 | |
| 3235 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { | |
| 3236 // This code is copy from clasic VM -> hpi::sysThreadCPUTime | |
| 3237 // If this function changes, os::is_thread_cpu_time_supported() should too | |
| 3238 if (os::win32::is_nt()) { | |
| 3239 FILETIME CreationTime; | |
| 3240 FILETIME ExitTime; | |
| 3241 FILETIME KernelTime; | |
| 3242 FILETIME UserTime; | |
| 3243 | |
| 3244 if ( GetThreadTimes(thread->osthread()->thread_handle(), | |
| 3245 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) | |
| 3246 return -1; | |
| 3247 else | |
| 3248 if (user_sys_cpu_time) { | |
| 3249 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; | |
| 3250 } else { | |
| 3251 return FT2INT64(UserTime) * 100; | |
| 3252 } | |
| 3253 } else { | |
| 3254 return (jlong) timeGetTime() * 1000000; | |
| 3255 } | |
| 3256 } | |
| 3257 | |
| 3258 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
| 3259 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits | |
| 3260 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time | |
| 3261 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time | |
| 3262 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
| 3263 } | |
| 3264 | |
| 3265 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
| 3266 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits | |
| 3267 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time | |
| 3268 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time | |
| 3269 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
| 3270 } | |
| 3271 | |
| 3272 bool os::is_thread_cpu_time_supported() { | |
| 3273 // see os::thread_cpu_time | |
| 3274 if (os::win32::is_nt()) { | |
| 3275 FILETIME CreationTime; | |
| 3276 FILETIME ExitTime; | |
| 3277 FILETIME KernelTime; | |
| 3278 FILETIME UserTime; | |
| 3279 | |
| 3280 if ( GetThreadTimes(GetCurrentThread(), | |
| 3281 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) | |
| 3282 return false; | |
| 3283 else | |
| 3284 return true; | |
| 3285 } else { | |
| 3286 return false; | |
| 3287 } | |
| 3288 } | |
| 3289 | |
| 3290 // Windows does't provide a loadavg primitive so this is stubbed out for now. | |
| 3291 // It does have primitives (PDH API) to get CPU usage and run queue length. | |
| 3292 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" | |
| 3293 // If we wanted to implement loadavg on Windows, we have a few options: | |
| 3294 // | |
| 3295 // a) Query CPU usage and run queue length and "fake" an answer by | |
| 3296 // returning the CPU usage if it's under 100%, and the run queue | |
| 3297 // length otherwise. It turns out that querying is pretty slow | |
| 3298 // on Windows, on the order of 200 microseconds on a fast machine. | |
| 3299 // Note that on the Windows the CPU usage value is the % usage | |
| 3300 // since the last time the API was called (and the first call | |
| 3301 // returns 100%), so we'd have to deal with that as well. | |
| 3302 // | |
| 3303 // b) Sample the "fake" answer using a sampling thread and store | |
| 3304 // the answer in a global variable. The call to loadavg would | |
| 3305 // just return the value of the global, avoiding the slow query. | |
| 3306 // | |
| 3307 // c) Sample a better answer using exponential decay to smooth the | |
| 3308 // value. This is basically the algorithm used by UNIX kernels. | |
| 3309 // | |
| 3310 // Note that sampling thread starvation could affect both (b) and (c). | |
| 3311 int os::loadavg(double loadavg[], int nelem) { | |
| 3312 return -1; | |
| 3313 } | |
| 3314 | |
| 3315 | |
| 3316 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() | |
| 3317 bool os::dont_yield() { | |
| 3318 return DontYieldALot; | |
| 3319 } | |
| 3320 | |
| 3321 // Is a (classpath) directory empty? | |
| 3322 bool os::dir_is_empty(const char* path) { | |
| 3323 WIN32_FIND_DATA fd; | |
| 3324 HANDLE f = FindFirstFile(path, &fd); | |
| 3325 if (f == INVALID_HANDLE_VALUE) { | |
| 3326 return true; | |
| 3327 } | |
| 3328 FindClose(f); | |
| 3329 return false; | |
| 3330 } | |
| 3331 | |
| 3332 // create binary file, rewriting existing file if required | |
| 3333 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
| 3334 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; | |
| 3335 if (!rewrite_existing) { | |
| 3336 oflags |= _O_EXCL; | |
| 3337 } | |
| 3338 return ::open(path, oflags, _S_IREAD | _S_IWRITE); | |
| 3339 } | |
| 3340 | |
| 3341 // return current position of file pointer | |
| 3342 jlong os::current_file_offset(int fd) { | |
| 3343 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); | |
| 3344 } | |
| 3345 | |
| 3346 // move file pointer to the specified offset | |
| 3347 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
| 3348 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); | |
| 3349 } | |
| 3350 | |
| 3351 | |
| 3352 // Map a block of memory. | |
| 3353 char* os::map_memory(int fd, const char* file_name, size_t file_offset, | |
| 3354 char *addr, size_t bytes, bool read_only, | |
| 3355 bool allow_exec) { | |
| 3356 HANDLE hFile; | |
| 3357 char* base; | |
| 3358 | |
| 3359 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, | |
| 3360 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); | |
| 3361 if (hFile == NULL) { | |
| 3362 if (PrintMiscellaneous && Verbose) { | |
| 3363 DWORD err = GetLastError(); | |
| 3364 tty->print_cr("CreateFile() failed: GetLastError->%ld."); | |
| 3365 } | |
| 3366 return NULL; | |
| 3367 } | |
| 3368 | |
| 3369 if (allow_exec) { | |
| 3370 // CreateFileMapping/MapViewOfFileEx can't map executable memory | |
| 3371 // unless it comes from a PE image (which the shared archive is not.) | |
| 3372 // Even VirtualProtect refuses to give execute access to mapped memory | |
| 3373 // that was not previously executable. | |
| 3374 // | |
| 3375 // Instead, stick the executable region in anonymous memory. Yuck. | |
| 3376 // Penalty is that ~4 pages will not be shareable - in the future | |
| 3377 // we might consider DLLizing the shared archive with a proper PE | |
| 3378 // header so that mapping executable + sharing is possible. | |
| 3379 | |
| 3380 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, | |
| 3381 PAGE_READWRITE); | |
| 3382 if (base == NULL) { | |
| 3383 if (PrintMiscellaneous && Verbose) { | |
| 3384 DWORD err = GetLastError(); | |
| 3385 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); | |
| 3386 } | |
| 3387 CloseHandle(hFile); | |
| 3388 return NULL; | |
| 3389 } | |
| 3390 | |
| 3391 DWORD bytes_read; | |
| 3392 OVERLAPPED overlapped; | |
| 3393 overlapped.Offset = (DWORD)file_offset; | |
| 3394 overlapped.OffsetHigh = 0; | |
| 3395 overlapped.hEvent = NULL; | |
| 3396 // ReadFile guarantees that if the return value is true, the requested | |
| 3397 // number of bytes were read before returning. | |
| 3398 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; | |
| 3399 if (!res) { | |
| 3400 if (PrintMiscellaneous && Verbose) { | |
| 3401 DWORD err = GetLastError(); | |
| 3402 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); | |
| 3403 } | |
| 3404 release_memory(base, bytes); | |
| 3405 CloseHandle(hFile); | |
| 3406 return NULL; | |
| 3407 } | |
| 3408 } else { | |
| 3409 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, | |
| 3410 NULL /*file_name*/); | |
| 3411 if (hMap == NULL) { | |
| 3412 if (PrintMiscellaneous && Verbose) { | |
| 3413 DWORD err = GetLastError(); | |
| 3414 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld."); | |
| 3415 } | |
| 3416 CloseHandle(hFile); | |
| 3417 return NULL; | |
| 3418 } | |
| 3419 | |
| 3420 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; | |
| 3421 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, | |
| 3422 (DWORD)bytes, addr); | |
| 3423 if (base == NULL) { | |
| 3424 if (PrintMiscellaneous && Verbose) { | |
| 3425 DWORD err = GetLastError(); | |
| 3426 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); | |
| 3427 } | |
| 3428 CloseHandle(hMap); | |
| 3429 CloseHandle(hFile); | |
| 3430 return NULL; | |
| 3431 } | |
| 3432 | |
| 3433 if (CloseHandle(hMap) == 0) { | |
| 3434 if (PrintMiscellaneous && Verbose) { | |
| 3435 DWORD err = GetLastError(); | |
| 3436 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); | |
| 3437 } | |
| 3438 CloseHandle(hFile); | |
| 3439 return base; | |
| 3440 } | |
| 3441 } | |
| 3442 | |
| 3443 if (allow_exec) { | |
| 3444 DWORD old_protect; | |
| 3445 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; | |
| 3446 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; | |
| 3447 | |
| 3448 if (!res) { | |
| 3449 if (PrintMiscellaneous && Verbose) { | |
| 3450 DWORD err = GetLastError(); | |
| 3451 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); | |
| 3452 } | |
| 3453 // Don't consider this a hard error, on IA32 even if the | |
| 3454 // VirtualProtect fails, we should still be able to execute | |
| 3455 CloseHandle(hFile); | |
| 3456 return base; | |
| 3457 } | |
| 3458 } | |
| 3459 | |
| 3460 if (CloseHandle(hFile) == 0) { | |
| 3461 if (PrintMiscellaneous && Verbose) { | |
| 3462 DWORD err = GetLastError(); | |
| 3463 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); | |
| 3464 } | |
| 3465 return base; | |
| 3466 } | |
| 3467 | |
| 3468 return base; | |
| 3469 } | |
| 3470 | |
| 3471 | |
| 3472 // Remap a block of memory. | |
| 3473 char* os::remap_memory(int fd, const char* file_name, size_t file_offset, | |
| 3474 char *addr, size_t bytes, bool read_only, | |
| 3475 bool allow_exec) { | |
| 3476 // This OS does not allow existing memory maps to be remapped so we | |
| 3477 // have to unmap the memory before we remap it. | |
| 3478 if (!os::unmap_memory(addr, bytes)) { | |
| 3479 return NULL; | |
| 3480 } | |
| 3481 | |
| 3482 // There is a very small theoretical window between the unmap_memory() | |
| 3483 // call above and the map_memory() call below where a thread in native | |
| 3484 // code may be able to access an address that is no longer mapped. | |
| 3485 | |
| 3486 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
| 3487 allow_exec); | |
| 3488 } | |
| 3489 | |
| 3490 | |
| 3491 // Unmap a block of memory. | |
| 3492 // Returns true=success, otherwise false. | |
| 3493 | |
| 3494 bool os::unmap_memory(char* addr, size_t bytes) { | |
| 3495 BOOL result = UnmapViewOfFile(addr); | |
| 3496 if (result == 0) { | |
| 3497 if (PrintMiscellaneous && Verbose) { | |
| 3498 DWORD err = GetLastError(); | |
| 3499 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); | |
| 3500 } | |
| 3501 return false; | |
| 3502 } | |
| 3503 return true; | |
| 3504 } | |
| 3505 | |
| 3506 void os::pause() { | |
| 3507 char filename[MAX_PATH]; | |
| 3508 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
| 3509 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
| 3510 } else { | |
| 3511 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
| 3512 } | |
| 3513 | |
| 3514 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
| 3515 if (fd != -1) { | |
| 3516 struct stat buf; | |
| 3517 close(fd); | |
| 3518 while (::stat(filename, &buf) == 0) { | |
| 3519 Sleep(100); | |
| 3520 } | |
| 3521 } else { | |
| 3522 jio_fprintf(stderr, | |
| 3523 "Could not open pause file '%s', continuing immediately.\n", filename); | |
| 3524 } | |
| 3525 } | |
| 3526 | |
| 3527 // An Event wraps a win32 "CreateEvent" kernel handle. | |
| 3528 // | |
| 3529 // We have a number of choices regarding "CreateEvent" win32 handle leakage: | |
| 3530 // | |
| 3531 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle | |
| 3532 // field, and call CloseHandle() on the win32 event handle. Unpark() would | |
| 3533 // need to be modified to tolerate finding a NULL (invalid) win32 event handle. | |
| 3534 // In addition, an unpark() operation might fetch the handle field, but the | |
| 3535 // event could recycle between the fetch and the SetEvent() operation. | |
| 3536 // SetEvent() would either fail because the handle was invalid, or inadvertently work, | |
| 3537 // as the win32 handle value had been recycled. In an ideal world calling SetEvent() | |
| 3538 // on an stale but recycled handle would be harmless, but in practice this might | |
| 3539 // confuse other non-Sun code, so it's not a viable approach. | |
| 3540 // | |
| 3541 // 2: Once a win32 event handle is associated with an Event, it remains associated | |
| 3542 // with the Event. The event handle is never closed. This could be construed | |
| 3543 // as handle leakage, but only up to the maximum # of threads that have been extant | |
| 3544 // at any one time. This shouldn't be an issue, as windows platforms typically | |
| 3545 // permit a process to have hundreds of thousands of open handles. | |
| 3546 // | |
| 3547 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList | |
| 3548 // and release unused handles. | |
| 3549 // | |
| 3550 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. | |
| 3551 // It's not clear, however, that we wouldn't be trading one type of leak for another. | |
| 3552 // | |
| 3553 // 5. Use an RCU-like mechanism (Read-Copy Update). | |
| 3554 // Or perhaps something similar to Maged Michael's "Hazard pointers". | |
| 3555 // | |
| 3556 // We use (2). | |
| 3557 // | |
| 3558 // TODO-FIXME: | |
| 3559 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. | |
| 3560 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks | |
| 3561 // to recover from (or at least detect) the dreaded Windows 841176 bug. | |
| 3562 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent | |
| 3563 // into a single win32 CreateEvent() handle. | |
| 3564 // | |
| 3565 // _Event transitions in park() | |
| 3566 // -1 => -1 : illegal | |
| 3567 // 1 => 0 : pass - return immediately | |
| 3568 // 0 => -1 : block | |
| 3569 // | |
| 3570 // _Event serves as a restricted-range semaphore : | |
| 3571 // -1 : thread is blocked | |
| 3572 // 0 : neutral - thread is running or ready | |
| 3573 // 1 : signaled - thread is running or ready | |
| 3574 // | |
| 3575 // Another possible encoding of _Event would be | |
| 3576 // with explicit "PARKED" and "SIGNALED" bits. | |
| 3577 | |
| 3578 int os::PlatformEvent::park (jlong Millis) { | |
| 3579 guarantee (_ParkHandle != NULL , "Invariant") ; | |
| 3580 guarantee (Millis > 0 , "Invariant") ; | |
| 3581 int v ; | |
| 3582 | |
| 3583 // CONSIDER: defer assigning a CreateEvent() handle to the Event until | |
| 3584 // the initial park() operation. | |
| 3585 | |
| 3586 for (;;) { | |
| 3587 v = _Event ; | |
| 3588 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
| 3589 } | |
| 3590 guarantee ((v == 0) || (v == 1), "invariant") ; | |
| 3591 if (v != 0) return OS_OK ; | |
| 3592 | |
| 3593 // Do this the hard way by blocking ... | |
| 3594 // TODO: consider a brief spin here, gated on the success of recent | |
| 3595 // spin attempts by this thread. | |
| 3596 // | |
| 3597 // We decompose long timeouts into series of shorter timed waits. | |
| 3598 // Evidently large timo values passed in WaitForSingleObject() are problematic on some | |
| 3599 // versions of Windows. See EventWait() for details. This may be superstition. Or not. | |
| 3600 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time | |
| 3601 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from | |
| 3602 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend | |
| 3603 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == | |
| 3604 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate | |
| 3605 // for the already waited time. This policy does not admit any new outcomes. | |
| 3606 // In the future, however, we might want to track the accumulated wait time and | |
| 3607 // adjust Millis accordingly if we encounter a spurious wakeup. | |
| 3608 | |
| 3609 const int MAXTIMEOUT = 0x10000000 ; | |
| 3610 DWORD rv = WAIT_TIMEOUT ; | |
| 3611 while (_Event < 0 && Millis > 0) { | |
| 3612 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT) | |
| 3613 if (Millis > MAXTIMEOUT) { | |
| 3614 prd = MAXTIMEOUT ; | |
| 3615 } | |
| 3616 rv = ::WaitForSingleObject (_ParkHandle, prd) ; | |
| 3617 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ; | |
| 3618 if (rv == WAIT_TIMEOUT) { | |
| 3619 Millis -= prd ; | |
| 3620 } | |
| 3621 } | |
| 3622 v = _Event ; | |
| 3623 _Event = 0 ; | |
| 3624 OrderAccess::fence() ; | |
| 3625 // If we encounter a nearly simultanous timeout expiry and unpark() | |
| 3626 // we return OS_OK indicating we awoke via unpark(). | |
| 3627 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. | |
| 3628 return (v >= 0) ? OS_OK : OS_TIMEOUT ; | |
| 3629 } | |
| 3630 | |
| 3631 void os::PlatformEvent::park () { | |
| 3632 guarantee (_ParkHandle != NULL, "Invariant") ; | |
| 3633 // Invariant: Only the thread associated with the Event/PlatformEvent | |
| 3634 // may call park(). | |
| 3635 int v ; | |
| 3636 for (;;) { | |
| 3637 v = _Event ; | |
| 3638 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
| 3639 } | |
| 3640 guarantee ((v == 0) || (v == 1), "invariant") ; | |
| 3641 if (v != 0) return ; | |
| 3642 | |
| 3643 // Do this the hard way by blocking ... | |
| 3644 // TODO: consider a brief spin here, gated on the success of recent | |
| 3645 // spin attempts by this thread. | |
| 3646 while (_Event < 0) { | |
| 3647 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ; | |
| 3648 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ; | |
| 3649 } | |
| 3650 | |
| 3651 // Usually we'll find _Event == 0 at this point, but as | |
| 3652 // an optional optimization we clear it, just in case can | |
| 3653 // multiple unpark() operations drove _Event up to 1. | |
| 3654 _Event = 0 ; | |
| 3655 OrderAccess::fence() ; | |
| 3656 guarantee (_Event >= 0, "invariant") ; | |
| 3657 } | |
| 3658 | |
| 3659 void os::PlatformEvent::unpark() { | |
| 3660 guarantee (_ParkHandle != NULL, "Invariant") ; | |
| 3661 int v ; | |
| 3662 for (;;) { | |
| 3663 v = _Event ; // Increment _Event if it's < 1. | |
| 3664 if (v > 0) { | |
| 3665 // If it's already signaled just return. | |
| 3666 // The LD of _Event could have reordered or be satisfied | |
| 3667 // by a read-aside from this processor's write buffer. | |
| 3668 // To avoid problems execute a barrier and then | |
| 3669 // ratify the value. A degenerate CAS() would also work. | |
| 3670 // Viz., CAS (v+0, &_Event, v) == v). | |
| 3671 OrderAccess::fence() ; | |
| 3672 if (_Event == v) return ; | |
| 3673 continue ; | |
| 3674 } | |
| 3675 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; | |
| 3676 } | |
| 3677 if (v < 0) { | |
| 3678 ::SetEvent (_ParkHandle) ; | |
| 3679 } | |
| 3680 } | |
| 3681 | |
| 3682 | |
| 3683 // JSR166 | |
| 3684 // ------------------------------------------------------- | |
| 3685 | |
| 3686 /* | |
| 3687 * The Windows implementation of Park is very straightforward: Basic | |
| 3688 * operations on Win32 Events turn out to have the right semantics to | |
| 3689 * use them directly. We opportunistically resuse the event inherited | |
| 3690 * from Monitor. | |
| 3691 */ | |
| 3692 | |
| 3693 | |
| 3694 void Parker::park(bool isAbsolute, jlong time) { | |
| 3695 guarantee (_ParkEvent != NULL, "invariant") ; | |
| 3696 // First, demultiplex/decode time arguments | |
| 3697 if (time < 0) { // don't wait | |
| 3698 return; | |
| 3699 } | |
| 3700 else if (time == 0) { | |
| 3701 time = INFINITE; | |
| 3702 } | |
| 3703 else if (isAbsolute) { | |
| 3704 time -= os::javaTimeMillis(); // convert to relative time | |
| 3705 if (time <= 0) // already elapsed | |
| 3706 return; | |
| 3707 } | |
| 3708 else { // relative | |
| 3709 time /= 1000000; // Must coarsen from nanos to millis | |
| 3710 if (time == 0) // Wait for the minimal time unit if zero | |
| 3711 time = 1; | |
| 3712 } | |
| 3713 | |
| 3714 JavaThread* thread = (JavaThread*)(Thread::current()); | |
| 3715 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
| 3716 JavaThread *jt = (JavaThread *)thread; | |
| 3717 | |
| 3718 // Don't wait if interrupted or already triggered | |
| 3719 if (Thread::is_interrupted(thread, false) || | |
| 3720 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { | |
| 3721 ResetEvent(_ParkEvent); | |
| 3722 return; | |
| 3723 } | |
| 3724 else { | |
| 3725 ThreadBlockInVM tbivm(jt); | |
| 3726 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
| 3727 jt->set_suspend_equivalent(); | |
| 3728 | |
| 3729 WaitForSingleObject(_ParkEvent, time); | |
| 3730 ResetEvent(_ParkEvent); | |
| 3731 | |
| 3732 // If externally suspended while waiting, re-suspend | |
| 3733 if (jt->handle_special_suspend_equivalent_condition()) { | |
| 3734 jt->java_suspend_self(); | |
| 3735 } | |
| 3736 } | |
| 3737 } | |
| 3738 | |
| 3739 void Parker::unpark() { | |
| 3740 guarantee (_ParkEvent != NULL, "invariant") ; | |
| 3741 SetEvent(_ParkEvent); | |
| 3742 } | |
| 3743 | |
| 3744 // Run the specified command in a separate process. Return its exit value, | |
| 3745 // or -1 on failure (e.g. can't create a new process). | |
| 3746 int os::fork_and_exec(char* cmd) { | |
| 3747 STARTUPINFO si; | |
| 3748 PROCESS_INFORMATION pi; | |
| 3749 | |
| 3750 memset(&si, 0, sizeof(si)); | |
| 3751 si.cb = sizeof(si); | |
| 3752 memset(&pi, 0, sizeof(pi)); | |
| 3753 BOOL rslt = CreateProcess(NULL, // executable name - use command line | |
| 3754 cmd, // command line | |
| 3755 NULL, // process security attribute | |
| 3756 NULL, // thread security attribute | |
| 3757 TRUE, // inherits system handles | |
| 3758 0, // no creation flags | |
| 3759 NULL, // use parent's environment block | |
| 3760 NULL, // use parent's starting directory | |
| 3761 &si, // (in) startup information | |
| 3762 &pi); // (out) process information | |
| 3763 | |
| 3764 if (rslt) { | |
| 3765 // Wait until child process exits. | |
| 3766 WaitForSingleObject(pi.hProcess, INFINITE); | |
| 3767 | |
| 3768 DWORD exit_code; | |
| 3769 GetExitCodeProcess(pi.hProcess, &exit_code); | |
| 3770 | |
| 3771 // Close process and thread handles. | |
| 3772 CloseHandle(pi.hProcess); | |
| 3773 CloseHandle(pi.hThread); | |
| 3774 | |
| 3775 return (int)exit_code; | |
| 3776 } else { | |
| 3777 return -1; | |
| 3778 } | |
| 3779 } | |
| 3780 | |
| 3781 //-------------------------------------------------------------------------------------------------- | |
| 3782 // Non-product code | |
| 3783 | |
| 3784 static int mallocDebugIntervalCounter = 0; | |
| 3785 static int mallocDebugCounter = 0; | |
| 3786 bool os::check_heap(bool force) { | |
| 3787 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; | |
| 3788 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { | |
| 3789 // Note: HeapValidate executes two hardware breakpoints when it finds something | |
| 3790 // wrong; at these points, eax contains the address of the offending block (I think). | |
| 3791 // To get to the exlicit error message(s) below, just continue twice. | |
| 3792 HANDLE heap = GetProcessHeap(); | |
| 3793 { HeapLock(heap); | |
| 3794 PROCESS_HEAP_ENTRY phe; | |
| 3795 phe.lpData = NULL; | |
| 3796 while (HeapWalk(heap, &phe) != 0) { | |
| 3797 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && | |
| 3798 !HeapValidate(heap, 0, phe.lpData)) { | |
| 3799 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); | |
| 3800 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); | |
| 3801 fatal("corrupted C heap"); | |
| 3802 } | |
| 3803 } | |
| 3804 int err = GetLastError(); | |
| 3805 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { | |
| 3806 fatal1("heap walk aborted with error %d", err); | |
| 3807 } | |
| 3808 HeapUnlock(heap); | |
| 3809 } | |
| 3810 mallocDebugIntervalCounter = 0; | |
| 3811 } | |
| 3812 return true; | |
| 3813 } | |
| 3814 | |
| 3815 | |
| 3816 #ifndef PRODUCT | |
| 3817 bool os::find(address addr) { | |
| 3818 // Nothing yet | |
| 3819 return false; | |
| 3820 } | |
| 3821 #endif | |
| 3822 | |
| 3823 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { | |
| 3824 DWORD exception_code = e->ExceptionRecord->ExceptionCode; | |
| 3825 | |
| 3826 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { | |
| 3827 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow(); | |
| 3828 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; | |
| 3829 address addr = (address) exceptionRecord->ExceptionInformation[1]; | |
| 3830 | |
| 3831 if (os::is_memory_serialize_page(thread, addr)) | |
| 3832 return EXCEPTION_CONTINUE_EXECUTION; | |
| 3833 } | |
| 3834 | |
| 3835 return EXCEPTION_CONTINUE_SEARCH; | |
| 3836 } | |
| 3837 | |
| 3838 static int getLastErrorString(char *buf, size_t len) | |
| 3839 { | |
| 3840 long errval; | |
| 3841 | |
| 3842 if ((errval = GetLastError()) != 0) | |
| 3843 { | |
| 3844 /* DOS error */ | |
| 3845 size_t n = (size_t)FormatMessage( | |
| 3846 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, | |
| 3847 NULL, | |
| 3848 errval, | |
| 3849 0, | |
| 3850 buf, | |
| 3851 (DWORD)len, | |
| 3852 NULL); | |
| 3853 if (n > 3) { | |
| 3854 /* Drop final '.', CR, LF */ | |
| 3855 if (buf[n - 1] == '\n') n--; | |
| 3856 if (buf[n - 1] == '\r') n--; | |
| 3857 if (buf[n - 1] == '.') n--; | |
| 3858 buf[n] = '\0'; | |
| 3859 } | |
| 3860 return (int)n; | |
| 3861 } | |
| 3862 | |
| 3863 if (errno != 0) | |
| 3864 { | |
| 3865 /* C runtime error that has no corresponding DOS error code */ | |
| 3866 const char *s = strerror(errno); | |
| 3867 size_t n = strlen(s); | |
| 3868 if (n >= len) n = len - 1; | |
| 3869 strncpy(buf, s, n); | |
| 3870 buf[n] = '\0'; | |
| 3871 return (int)n; | |
| 3872 } | |
| 3873 return 0; | |
| 3874 } |