1 /* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // Must be at least Windows 2000 or XP to use IsDebuggerPresent 26 #define _WIN32_WINNT 0x500 27 28 // no precompiled headers 29 #include "classfile/classLoader.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "code/icBuffer.hpp" 33 #include "code/vtableStubs.hpp" 34 #include "compiler/compileBroker.hpp" 35 #include "compiler/disassembler.hpp" 36 #include "interpreter/interpreter.hpp" 37 #include "jvm_windows.h" 38 #include "memory/allocation.inline.hpp" 39 #include "memory/filemap.hpp" 40 #include "mutex_windows.inline.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "os_share_windows.hpp" 43 #include "prims/jniFastGetField.hpp" 44 #include "prims/jvm.h" 45 #include "prims/jvm_misc.hpp" 46 #include "runtime/arguments.hpp" 47 #include "runtime/extendedPC.hpp" 48 #include "runtime/globals.hpp" 49 #include "runtime/interfaceSupport.hpp" 50 #include "runtime/java.hpp" 51 #include "runtime/javaCalls.hpp" 52 #include "runtime/mutexLocker.hpp" 53 #include "runtime/objectMonitor.hpp" 54 #include "runtime/osThread.hpp" 55 #include "runtime/perfMemory.hpp" 56 #include "runtime/sharedRuntime.hpp" 57 #include "runtime/statSampler.hpp" 58 #include "runtime/stubRoutines.hpp" 59 #include "runtime/thread.inline.hpp" 60 #include "runtime/threadCritical.hpp" 61 #include "runtime/timer.hpp" 62 #include "services/attachListener.hpp" 63 #include "services/memTracker.hpp" 64 #include "services/runtimeService.hpp" 65 #include "utilities/decoder.hpp" 66 #include "utilities/defaultStream.hpp" 67 #include "utilities/events.hpp" 68 #include "utilities/growableArray.hpp" 69 #include "utilities/vmError.hpp" 70 71 #ifdef _DEBUG 72 #include <crtdbg.h> 73 #endif 74 75 76 #include <windows.h> 77 #include <sys/types.h> 78 #include <sys/stat.h> 79 #include <sys/timeb.h> 80 #include <objidl.h> 81 #include <shlobj.h> 82 83 #include <malloc.h> 84 #include <signal.h> 85 #include <direct.h> 86 #include <errno.h> 87 #include <fcntl.h> 88 #include <io.h> 89 #include <process.h> // For _beginthreadex(), _endthreadex() 90 #include <imagehlp.h> // For os::dll_address_to_function_name 91 /* for enumerating dll libraries */ 92 #include <vdmdbg.h> 93 94 // for timer info max values which include all bits 95 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 96 97 // For DLL loading/load error detection 98 // Values of PE COFF 99 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c 100 #define IMAGE_FILE_SIGNATURE_LENGTH 4 101 102 static HANDLE main_process; 103 static HANDLE main_thread; 104 static int main_thread_id; 105 106 static FILETIME process_creation_time; 107 static FILETIME process_exit_time; 108 static FILETIME process_user_time; 109 static FILETIME process_kernel_time; 110 111 #ifdef _M_IA64 112 #define __CPU__ ia64 113 #elif _M_AMD64 114 #define __CPU__ amd64 115 #else 116 #define __CPU__ i486 117 #endif 118 119 // save DLL module handle, used by GetModuleFileName 120 121 HINSTANCE vm_lib_handle; 122 123 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { 124 switch (reason) { 125 case DLL_PROCESS_ATTACH: 126 vm_lib_handle = hinst; 127 if(ForceTimeHighResolution) 128 timeBeginPeriod(1L); 129 break; 130 case DLL_PROCESS_DETACH: 131 if(ForceTimeHighResolution) 132 timeEndPeriod(1L); 133 break; 134 default: 135 break; 136 } 137 return true; 138 } 139 140 static inline double fileTimeAsDouble(FILETIME* time) { 141 const double high = (double) ((unsigned int) ~0); 142 const double split = 10000000.0; 143 double result = (time->dwLowDateTime / split) + 144 time->dwHighDateTime * (high/split); 145 return result; 146 } 147 148 // Implementation of os 149 150 bool os::getenv(const char* name, char* buffer, int len) { 151 int result = GetEnvironmentVariable(name, buffer, len); 152 return result > 0 && result < len; 153 } 154 155 156 // No setuid programs under Windows. 157 bool os::have_special_privileges() { 158 return false; 159 } 160 161 162 // This method is a periodic task to check for misbehaving JNI applications 163 // under CheckJNI, we can add any periodic checks here. 164 // For Windows at the moment does nothing 165 void os::run_periodic_checks() { 166 return; 167 } 168 169 // previous UnhandledExceptionFilter, if there is one 170 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL; 171 172 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 173 void os::init_system_properties_values() { 174 /* sysclasspath, java_home, dll_dir */ 175 { 176 char *home_path; 177 char *dll_path; 178 char *pslash; 179 char *bin = "\\bin"; 180 char home_dir[MAX_PATH]; 181 182 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) { 183 os::jvm_path(home_dir, sizeof(home_dir)); 184 // Found the full path to jvm.dll. 185 // Now cut the path to <java_home>/jre if we can. 186 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */ 187 pslash = strrchr(home_dir, '\\'); 188 if (pslash != NULL) { 189 *pslash = '\0'; /* get rid of \{client|server} */ 190 pslash = strrchr(home_dir, '\\'); 191 if (pslash != NULL) 192 *pslash = '\0'; /* get rid of \bin */ 193 } 194 } 195 196 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal); 197 if (home_path == NULL) 198 return; 199 strcpy(home_path, home_dir); 200 Arguments::set_java_home(home_path); 201 202 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, mtInternal); 203 if (dll_path == NULL) 204 return; 205 strcpy(dll_path, home_dir); 206 strcat(dll_path, bin); 207 Arguments::set_dll_dir(dll_path); 208 209 if (!set_boot_path('\\', ';')) 210 return; 211 } 212 213 /* library_path */ 214 #define EXT_DIR "\\lib\\ext" 215 #define BIN_DIR "\\bin" 216 #define PACKAGE_DIR "\\Sun\\Java" 217 { 218 /* Win32 library search order (See the documentation for LoadLibrary): 219 * 220 * 1. The directory from which application is loaded. 221 * 2. The system wide Java Extensions directory (Java only) 222 * 3. System directory (GetSystemDirectory) 223 * 4. Windows directory (GetWindowsDirectory) 224 * 5. The PATH environment variable 225 * 6. The current directory 226 */ 227 228 char *library_path; 229 char tmp[MAX_PATH]; 230 char *path_str = ::getenv("PATH"); 231 232 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 233 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal); 234 235 library_path[0] = '\0'; 236 237 GetModuleFileName(NULL, tmp, sizeof(tmp)); 238 *(strrchr(tmp, '\\')) = '\0'; 239 strcat(library_path, tmp); 240 241 GetWindowsDirectory(tmp, sizeof(tmp)); 242 strcat(library_path, ";"); 243 strcat(library_path, tmp); 244 strcat(library_path, PACKAGE_DIR BIN_DIR); 245 246 GetSystemDirectory(tmp, sizeof(tmp)); 247 strcat(library_path, ";"); 248 strcat(library_path, tmp); 249 250 GetWindowsDirectory(tmp, sizeof(tmp)); 251 strcat(library_path, ";"); 252 strcat(library_path, tmp); 253 254 if (path_str) { 255 strcat(library_path, ";"); 256 strcat(library_path, path_str); 257 } 258 259 strcat(library_path, ";."); 260 261 Arguments::set_library_path(library_path); 262 FREE_C_HEAP_ARRAY(char, library_path, mtInternal); 263 } 264 265 /* Default extensions directory */ 266 { 267 char path[MAX_PATH]; 268 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 269 GetWindowsDirectory(path, MAX_PATH); 270 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 271 path, PACKAGE_DIR, EXT_DIR); 272 Arguments::set_ext_dirs(buf); 273 } 274 #undef EXT_DIR 275 #undef BIN_DIR 276 #undef PACKAGE_DIR 277 278 /* Default endorsed standards directory. */ 279 { 280 #define ENDORSED_DIR "\\lib\\endorsed" 281 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR); 282 char * buf = NEW_C_HEAP_ARRAY(char, len, mtInternal); 283 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR); 284 Arguments::set_endorsed_dirs(buf); 285 #undef ENDORSED_DIR 286 } 287 288 #ifndef _WIN64 289 // set our UnhandledExceptionFilter and save any previous one 290 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception); 291 #endif 292 293 // Done 294 return; 295 } 296 297 void os::breakpoint() { 298 DebugBreak(); 299 } 300 301 // Invoked from the BREAKPOINT Macro 302 extern "C" void breakpoint() { 303 os::breakpoint(); 304 } 305 306 /* 307 * RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP. 308 * So far, this method is only used by Native Memory Tracking, which is 309 * only supported on Windows XP or later. 310 */ 311 address os::get_caller_pc(int n) { 312 #ifdef _NMT_NOINLINE_ 313 n ++; 314 #endif 315 address pc; 316 if (os::Kernel32Dll::RtlCaptureStackBackTrace(n + 1, 1, (PVOID*)&pc, NULL) == 1) { 317 return pc; 318 } 319 return NULL; 320 } 321 322 323 // os::current_stack_base() 324 // 325 // Returns the base of the stack, which is the stack's 326 // starting address. This function must be called 327 // while running on the stack of the thread being queried. 328 329 address os::current_stack_base() { 330 MEMORY_BASIC_INFORMATION minfo; 331 address stack_bottom; 332 size_t stack_size; 333 334 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 335 stack_bottom = (address)minfo.AllocationBase; 336 stack_size = minfo.RegionSize; 337 338 // Add up the sizes of all the regions with the same 339 // AllocationBase. 340 while( 1 ) 341 { 342 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 343 if ( stack_bottom == (address)minfo.AllocationBase ) 344 stack_size += minfo.RegionSize; 345 else 346 break; 347 } 348 349 #ifdef _M_IA64 350 // IA64 has memory and register stacks 351 // 352 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit 353 // at thread creation (1MB backing store growing upwards, 1MB memory stack 354 // growing downwards, 2MB summed up) 355 // 356 // ... 357 // ------- top of stack (high address) ----- 358 // | 359 // | 1MB 360 // | Backing Store (Register Stack) 361 // | 362 // | / \ 363 // | | 364 // | | 365 // | | 366 // ------------------------ stack base ----- 367 // | 1MB 368 // | Memory Stack 369 // | 370 // | | 371 // | | 372 // | | 373 // | \ / 374 // | 375 // ----- bottom of stack (low address) ----- 376 // ... 377 378 stack_size = stack_size / 2; 379 #endif 380 return stack_bottom + stack_size; 381 } 382 383 size_t os::current_stack_size() { 384 size_t sz; 385 MEMORY_BASIC_INFORMATION minfo; 386 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 387 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 388 return sz; 389 } 390 391 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 392 const struct tm* time_struct_ptr = localtime(clock); 393 if (time_struct_ptr != NULL) { 394 *res = *time_struct_ptr; 395 return res; 396 } 397 return NULL; 398 } 399 400 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 401 402 // Thread start routine for all new Java threads 403 static unsigned __stdcall java_start(Thread* thread) { 404 // Try to randomize the cache line index of hot stack frames. 405 // This helps when threads of the same stack traces evict each other's 406 // cache lines. The threads can be either from the same JVM instance, or 407 // from different JVM instances. The benefit is especially true for 408 // processors with hyperthreading technology. 409 static int counter = 0; 410 int pid = os::current_process_id(); 411 _alloca(((pid ^ counter++) & 7) * 128); 412 413 OSThread* osthr = thread->osthread(); 414 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 415 416 if (UseNUMA) { 417 int lgrp_id = os::numa_get_group_id(); 418 if (lgrp_id != -1) { 419 thread->set_lgrp_id(lgrp_id); 420 } 421 } 422 423 424 // Install a win32 structured exception handler around every thread created 425 // by VM, so VM can genrate error dump when an exception occurred in non- 426 // Java thread (e.g. VM thread). 427 __try { 428 thread->run(); 429 } __except(topLevelExceptionFilter( 430 (_EXCEPTION_POINTERS*)_exception_info())) { 431 // Nothing to do. 432 } 433 434 // One less thread is executing 435 // When the VMThread gets here, the main thread may have already exited 436 // which frees the CodeHeap containing the Atomic::add code 437 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 438 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); 439 } 440 441 return 0; 442 } 443 444 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) { 445 // Allocate the OSThread object 446 OSThread* osthread = new OSThread(NULL, NULL); 447 if (osthread == NULL) return NULL; 448 449 // Initialize support for Java interrupts 450 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 451 if (interrupt_event == NULL) { 452 delete osthread; 453 return NULL; 454 } 455 osthread->set_interrupt_event(interrupt_event); 456 457 // Store info on the Win32 thread into the OSThread 458 osthread->set_thread_handle(thread_handle); 459 osthread->set_thread_id(thread_id); 460 461 if (UseNUMA) { 462 int lgrp_id = os::numa_get_group_id(); 463 if (lgrp_id != -1) { 464 thread->set_lgrp_id(lgrp_id); 465 } 466 } 467 468 // Initial thread state is INITIALIZED, not SUSPENDED 469 osthread->set_state(INITIALIZED); 470 471 return osthread; 472 } 473 474 475 bool os::create_attached_thread(JavaThread* thread) { 476 #ifdef ASSERT 477 thread->verify_not_published(); 478 #endif 479 HANDLE thread_h; 480 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 481 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 482 fatal("DuplicateHandle failed\n"); 483 } 484 OSThread* osthread = create_os_thread(thread, thread_h, 485 (int)current_thread_id()); 486 if (osthread == NULL) { 487 return false; 488 } 489 490 // Initial thread state is RUNNABLE 491 osthread->set_state(RUNNABLE); 492 493 thread->set_osthread(osthread); 494 return true; 495 } 496 497 bool os::create_main_thread(JavaThread* thread) { 498 #ifdef ASSERT 499 thread->verify_not_published(); 500 #endif 501 if (_starting_thread == NULL) { 502 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 503 if (_starting_thread == NULL) { 504 return false; 505 } 506 } 507 508 // The primordial thread is runnable from the start) 509 _starting_thread->set_state(RUNNABLE); 510 511 thread->set_osthread(_starting_thread); 512 return true; 513 } 514 515 // Allocate and initialize a new OSThread 516 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 517 unsigned thread_id; 518 519 // Allocate the OSThread object 520 OSThread* osthread = new OSThread(NULL, NULL); 521 if (osthread == NULL) { 522 return false; 523 } 524 525 // Initialize support for Java interrupts 526 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 527 if (interrupt_event == NULL) { 528 delete osthread; 529 return NULL; 530 } 531 osthread->set_interrupt_event(interrupt_event); 532 osthread->set_interrupted(false); 533 534 thread->set_osthread(osthread); 535 536 if (stack_size == 0) { 537 switch (thr_type) { 538 case os::java_thread: 539 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 540 if (JavaThread::stack_size_at_create() > 0) 541 stack_size = JavaThread::stack_size_at_create(); 542 break; 543 case os::compiler_thread: 544 if (CompilerThreadStackSize > 0) { 545 stack_size = (size_t)(CompilerThreadStackSize * K); 546 break; 547 } // else fall through: 548 // use VMThreadStackSize if CompilerThreadStackSize is not defined 549 case os::vm_thread: 550 case os::pgc_thread: 551 case os::cgc_thread: 552 case os::watcher_thread: 553 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 554 break; 555 } 556 } 557 558 // Create the Win32 thread 559 // 560 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 561 // does not specify stack size. Instead, it specifies the size of 562 // initially committed space. The stack size is determined by 563 // PE header in the executable. If the committed "stack_size" is larger 564 // than default value in the PE header, the stack is rounded up to the 565 // nearest multiple of 1MB. For example if the launcher has default 566 // stack size of 320k, specifying any size less than 320k does not 567 // affect the actual stack size at all, it only affects the initial 568 // commitment. On the other hand, specifying 'stack_size' larger than 569 // default value may cause significant increase in memory usage, because 570 // not only the stack space will be rounded up to MB, but also the 571 // entire space is committed upfront. 572 // 573 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 574 // for CreateThread() that can treat 'stack_size' as stack size. However we 575 // are not supposed to call CreateThread() directly according to MSDN 576 // document because JVM uses C runtime library. The good news is that the 577 // flag appears to work with _beginthredex() as well. 578 579 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION 580 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000) 581 #endif 582 583 HANDLE thread_handle = 584 (HANDLE)_beginthreadex(NULL, 585 (unsigned)stack_size, 586 (unsigned (__stdcall *)(void*)) java_start, 587 thread, 588 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, 589 &thread_id); 590 if (thread_handle == NULL) { 591 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again 592 // without the flag. 593 thread_handle = 594 (HANDLE)_beginthreadex(NULL, 595 (unsigned)stack_size, 596 (unsigned (__stdcall *)(void*)) java_start, 597 thread, 598 CREATE_SUSPENDED, 599 &thread_id); 600 } 601 if (thread_handle == NULL) { 602 // Need to clean up stuff we've allocated so far 603 CloseHandle(osthread->interrupt_event()); 604 thread->set_osthread(NULL); 605 delete osthread; 606 return NULL; 607 } 608 609 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); 610 611 // Store info on the Win32 thread into the OSThread 612 osthread->set_thread_handle(thread_handle); 613 osthread->set_thread_id(thread_id); 614 615 // Initial thread state is INITIALIZED, not SUSPENDED 616 osthread->set_state(INITIALIZED); 617 618 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 619 return true; 620 } 621 622 623 // Free Win32 resources related to the OSThread 624 void os::free_thread(OSThread* osthread) { 625 assert(osthread != NULL, "osthread not set"); 626 CloseHandle(osthread->thread_handle()); 627 CloseHandle(osthread->interrupt_event()); 628 delete osthread; 629 } 630 631 632 static int has_performance_count = 0; 633 static jlong first_filetime; 634 static jlong initial_performance_count; 635 static jlong performance_frequency; 636 637 638 jlong as_long(LARGE_INTEGER x) { 639 jlong result = 0; // initialization to avoid warning 640 set_high(&result, x.HighPart); 641 set_low(&result, x.LowPart); 642 return result; 643 } 644 645 646 jlong os::elapsed_counter() { 647 LARGE_INTEGER count; 648 if (has_performance_count) { 649 QueryPerformanceCounter(&count); 650 return as_long(count) - initial_performance_count; 651 } else { 652 FILETIME wt; 653 GetSystemTimeAsFileTime(&wt); 654 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime); 655 } 656 } 657 658 659 jlong os::elapsed_frequency() { 660 if (has_performance_count) { 661 return performance_frequency; 662 } else { 663 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601. 664 return 10000000; 665 } 666 } 667 668 669 julong os::available_memory() { 670 return win32::available_memory(); 671 } 672 673 julong os::win32::available_memory() { 674 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 675 // value if total memory is larger than 4GB 676 MEMORYSTATUSEX ms; 677 ms.dwLength = sizeof(ms); 678 GlobalMemoryStatusEx(&ms); 679 680 return (julong)ms.ullAvailPhys; 681 } 682 683 julong os::physical_memory() { 684 return win32::physical_memory(); 685 } 686 687 bool os::has_allocatable_memory_limit(julong* limit) { 688 MEMORYSTATUSEX ms; 689 ms.dwLength = sizeof(ms); 690 GlobalMemoryStatusEx(&ms); 691 #ifdef _LP64 692 *limit = (julong)ms.ullAvailVirtual; 693 return true; 694 #else 695 // Limit to 1400m because of the 2gb address space wall 696 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual); 697 return true; 698 #endif 699 } 700 701 // VC6 lacks DWORD_PTR 702 #if _MSC_VER < 1300 703 typedef UINT_PTR DWORD_PTR; 704 #endif 705 706 int os::active_processor_count() { 707 DWORD_PTR lpProcessAffinityMask = 0; 708 DWORD_PTR lpSystemAffinityMask = 0; 709 int proc_count = processor_count(); 710 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 711 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 712 // Nof active processors is number of bits in process affinity mask 713 int bitcount = 0; 714 while (lpProcessAffinityMask != 0) { 715 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 716 bitcount++; 717 } 718 return bitcount; 719 } else { 720 return proc_count; 721 } 722 } 723 724 void os::set_native_thread_name(const char *name) { 725 // Not yet implemented. 726 return; 727 } 728 729 bool os::distribute_processes(uint length, uint* distribution) { 730 // Not yet implemented. 731 return false; 732 } 733 734 bool os::bind_to_processor(uint processor_id) { 735 // Not yet implemented. 736 return false; 737 } 738 739 static void initialize_performance_counter() { 740 LARGE_INTEGER count; 741 if (QueryPerformanceFrequency(&count)) { 742 has_performance_count = 1; 743 performance_frequency = as_long(count); 744 QueryPerformanceCounter(&count); 745 initial_performance_count = as_long(count); 746 } else { 747 has_performance_count = 0; 748 FILETIME wt; 749 GetSystemTimeAsFileTime(&wt); 750 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 751 } 752 } 753 754 755 double os::elapsedTime() { 756 return (double) elapsed_counter() / (double) elapsed_frequency(); 757 } 758 759 760 // Windows format: 761 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 762 // Java format: 763 // Java standards require the number of milliseconds since 1/1/1970 764 765 // Constant offset - calculated using offset() 766 static jlong _offset = 116444736000000000; 767 // Fake time counter for reproducible results when debugging 768 static jlong fake_time = 0; 769 770 #ifdef ASSERT 771 // Just to be safe, recalculate the offset in debug mode 772 static jlong _calculated_offset = 0; 773 static int _has_calculated_offset = 0; 774 775 jlong offset() { 776 if (_has_calculated_offset) return _calculated_offset; 777 SYSTEMTIME java_origin; 778 java_origin.wYear = 1970; 779 java_origin.wMonth = 1; 780 java_origin.wDayOfWeek = 0; // ignored 781 java_origin.wDay = 1; 782 java_origin.wHour = 0; 783 java_origin.wMinute = 0; 784 java_origin.wSecond = 0; 785 java_origin.wMilliseconds = 0; 786 FILETIME jot; 787 if (!SystemTimeToFileTime(&java_origin, &jot)) { 788 fatal(err_msg("Error = %d\nWindows error", GetLastError())); 789 } 790 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 791 _has_calculated_offset = 1; 792 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 793 return _calculated_offset; 794 } 795 #else 796 jlong offset() { 797 return _offset; 798 } 799 #endif 800 801 jlong windows_to_java_time(FILETIME wt) { 802 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 803 return (a - offset()) / 10000; 804 } 805 806 FILETIME java_to_windows_time(jlong l) { 807 jlong a = (l * 10000) + offset(); 808 FILETIME result; 809 result.dwHighDateTime = high(a); 810 result.dwLowDateTime = low(a); 811 return result; 812 } 813 814 bool os::supports_vtime() { return true; } 815 bool os::enable_vtime() { return false; } 816 bool os::vtime_enabled() { return false; } 817 818 double os::elapsedVTime() { 819 FILETIME created; 820 FILETIME exited; 821 FILETIME kernel; 822 FILETIME user; 823 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) { 824 // the resolution of windows_to_java_time() should be sufficient (ms) 825 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS; 826 } else { 827 return elapsedTime(); 828 } 829 } 830 831 jlong os::javaTimeMillis() { 832 if (UseFakeTimers) { 833 return fake_time++; 834 } else { 835 FILETIME wt; 836 GetSystemTimeAsFileTime(&wt); 837 return windows_to_java_time(wt); 838 } 839 } 840 841 jlong os::javaTimeNanos() { 842 if (!has_performance_count) { 843 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do. 844 } else { 845 LARGE_INTEGER current_count; 846 QueryPerformanceCounter(¤t_count); 847 double current = as_long(current_count); 848 double freq = performance_frequency; 849 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC); 850 return time; 851 } 852 } 853 854 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 855 if (!has_performance_count) { 856 // javaTimeMillis() doesn't have much percision, 857 // but it is not going to wrap -- so all 64 bits 858 info_ptr->max_value = ALL_64_BITS; 859 860 // this is a wall clock timer, so may skip 861 info_ptr->may_skip_backward = true; 862 info_ptr->may_skip_forward = true; 863 } else { 864 jlong freq = performance_frequency; 865 if (freq < NANOSECS_PER_SEC) { 866 // the performance counter is 64 bits and we will 867 // be multiplying it -- so no wrap in 64 bits 868 info_ptr->max_value = ALL_64_BITS; 869 } else if (freq > NANOSECS_PER_SEC) { 870 // use the max value the counter can reach to 871 // determine the max value which could be returned 872 julong max_counter = (julong)ALL_64_BITS; 873 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC)); 874 } else { 875 // the performance counter is 64 bits and we will 876 // be using it directly -- so no wrap in 64 bits 877 info_ptr->max_value = ALL_64_BITS; 878 } 879 880 // using a counter, so no skipping 881 info_ptr->may_skip_backward = false; 882 info_ptr->may_skip_forward = false; 883 } 884 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 885 } 886 887 char* os::local_time_string(char *buf, size_t buflen) { 888 SYSTEMTIME st; 889 GetLocalTime(&st); 890 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 891 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 892 return buf; 893 } 894 895 bool os::getTimesSecs(double* process_real_time, 896 double* process_user_time, 897 double* process_system_time) { 898 HANDLE h_process = GetCurrentProcess(); 899 FILETIME create_time, exit_time, kernel_time, user_time; 900 BOOL result = GetProcessTimes(h_process, 901 &create_time, 902 &exit_time, 903 &kernel_time, 904 &user_time); 905 if (result != 0) { 906 FILETIME wt; 907 GetSystemTimeAsFileTime(&wt); 908 jlong rtc_millis = windows_to_java_time(wt); 909 jlong user_millis = windows_to_java_time(user_time); 910 jlong system_millis = windows_to_java_time(kernel_time); 911 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 912 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); 913 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); 914 return true; 915 } else { 916 return false; 917 } 918 } 919 920 void os::shutdown() { 921 922 // allow PerfMemory to attempt cleanup of any persistent resources 923 perfMemory_exit(); 924 925 // flush buffered output, finish log files 926 ostream_abort(); 927 928 // Check for abort hook 929 abort_hook_t abort_hook = Arguments::abort_hook(); 930 if (abort_hook != NULL) { 931 abort_hook(); 932 } 933 } 934 935 936 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION, 937 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION); 938 939 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) { 940 HINSTANCE dbghelp; 941 EXCEPTION_POINTERS ep; 942 MINIDUMP_EXCEPTION_INFORMATION mei; 943 MINIDUMP_EXCEPTION_INFORMATION* pmei; 944 945 HANDLE hProcess = GetCurrentProcess(); 946 DWORD processId = GetCurrentProcessId(); 947 HANDLE dumpFile; 948 MINIDUMP_TYPE dumpType; 949 static const char* cwd; 950 951 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows. 952 #ifndef ASSERT 953 // If running on a client version of Windows and user has not explicitly enabled dumping 954 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) { 955 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false); 956 return; 957 // If running on a server version of Windows and user has explictly disabled dumping 958 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) { 959 VMError::report_coredump_status("Minidump has been disabled from the command line", false); 960 return; 961 } 962 #else 963 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) { 964 VMError::report_coredump_status("Minidump has been disabled from the command line", false); 965 return; 966 } 967 #endif 968 969 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0); 970 971 if (dbghelp == NULL) { 972 VMError::report_coredump_status("Failed to load dbghelp.dll", false); 973 return; 974 } 975 976 _MiniDumpWriteDump = CAST_TO_FN_PTR( 977 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION, 978 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION), 979 GetProcAddress(dbghelp, "MiniDumpWriteDump")); 980 981 if (_MiniDumpWriteDump == NULL) { 982 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false); 983 return; 984 } 985 986 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData); 987 988 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with 989 // API_VERSION_NUMBER 11 or higher contains the ones we want though 990 #if API_VERSION_NUMBER >= 11 991 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | 992 MiniDumpWithUnloadedModules); 993 #endif 994 995 cwd = get_current_directory(NULL, 0); 996 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp",cwd, current_process_id()); 997 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); 998 999 if (dumpFile == INVALID_HANDLE_VALUE) { 1000 VMError::report_coredump_status("Failed to create file for dumping", false); 1001 return; 1002 } 1003 if (exceptionRecord != NULL && contextRecord != NULL) { 1004 ep.ContextRecord = (PCONTEXT) contextRecord; 1005 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord; 1006 1007 mei.ThreadId = GetCurrentThreadId(); 1008 mei.ExceptionPointers = &ep; 1009 pmei = &mei; 1010 } else { 1011 pmei = NULL; 1012 } 1013 1014 1015 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all 1016 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then. 1017 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false && 1018 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) { 1019 DWORD error = GetLastError(); 1020 LPTSTR msgbuf = NULL; 1021 1022 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | 1023 FORMAT_MESSAGE_FROM_SYSTEM | 1024 FORMAT_MESSAGE_IGNORE_INSERTS, 1025 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) { 1026 1027 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf); 1028 LocalFree(msgbuf); 1029 } else { 1030 // Call to FormatMessage failed, just include the result from GetLastError 1031 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error); 1032 } 1033 VMError::report_coredump_status(buffer, false); 1034 } else { 1035 VMError::report_coredump_status(buffer, true); 1036 } 1037 1038 CloseHandle(dumpFile); 1039 } 1040 1041 1042 1043 void os::abort(bool dump_core) 1044 { 1045 os::shutdown(); 1046 // no core dump on Windows 1047 ::exit(1); 1048 } 1049 1050 // Die immediately, no exit hook, no abort hook, no cleanup. 1051 void os::die() { 1052 _exit(-1); 1053 } 1054 1055 // Directory routines copied from src/win32/native/java/io/dirent_md.c 1056 // * dirent_md.c 1.15 00/02/02 1057 // 1058 // The declarations for DIR and struct dirent are in jvm_win32.h. 1059 1060 /* Caller must have already run dirname through JVM_NativePath, which removes 1061 duplicate slashes and converts all instances of '/' into '\\'. */ 1062 1063 DIR * 1064 os::opendir(const char *dirname) 1065 { 1066 assert(dirname != NULL, "just checking"); // hotspot change 1067 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal); 1068 DWORD fattr; // hotspot change 1069 char alt_dirname[4] = { 0, 0, 0, 0 }; 1070 1071 if (dirp == 0) { 1072 errno = ENOMEM; 1073 return 0; 1074 } 1075 1076 /* 1077 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it 1078 * as a directory in FindFirstFile(). We detect this case here and 1079 * prepend the current drive name. 1080 */ 1081 if (dirname[1] == '\0' && dirname[0] == '\\') { 1082 alt_dirname[0] = _getdrive() + 'A' - 1; 1083 alt_dirname[1] = ':'; 1084 alt_dirname[2] = '\\'; 1085 alt_dirname[3] = '\0'; 1086 dirname = alt_dirname; 1087 } 1088 1089 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal); 1090 if (dirp->path == 0) { 1091 free(dirp, mtInternal); 1092 errno = ENOMEM; 1093 return 0; 1094 } 1095 strcpy(dirp->path, dirname); 1096 1097 fattr = GetFileAttributes(dirp->path); 1098 if (fattr == 0xffffffff) { 1099 free(dirp->path, mtInternal); 1100 free(dirp, mtInternal); 1101 errno = ENOENT; 1102 return 0; 1103 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 1104 free(dirp->path, mtInternal); 1105 free(dirp, mtInternal); 1106 errno = ENOTDIR; 1107 return 0; 1108 } 1109 1110 /* Append "*.*", or possibly "\\*.*", to path */ 1111 if (dirp->path[1] == ':' 1112 && (dirp->path[2] == '\0' 1113 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 1114 /* No '\\' needed for cases like "Z:" or "Z:\" */ 1115 strcat(dirp->path, "*.*"); 1116 } else { 1117 strcat(dirp->path, "\\*.*"); 1118 } 1119 1120 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 1121 if (dirp->handle == INVALID_HANDLE_VALUE) { 1122 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 1123 free(dirp->path, mtInternal); 1124 free(dirp, mtInternal); 1125 errno = EACCES; 1126 return 0; 1127 } 1128 } 1129 return dirp; 1130 } 1131 1132 /* parameter dbuf unused on Windows */ 1133 1134 struct dirent * 1135 os::readdir(DIR *dirp, dirent *dbuf) 1136 { 1137 assert(dirp != NULL, "just checking"); // hotspot change 1138 if (dirp->handle == INVALID_HANDLE_VALUE) { 1139 return 0; 1140 } 1141 1142 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 1143 1144 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 1145 if (GetLastError() == ERROR_INVALID_HANDLE) { 1146 errno = EBADF; 1147 return 0; 1148 } 1149 FindClose(dirp->handle); 1150 dirp->handle = INVALID_HANDLE_VALUE; 1151 } 1152 1153 return &dirp->dirent; 1154 } 1155 1156 int 1157 os::closedir(DIR *dirp) 1158 { 1159 assert(dirp != NULL, "just checking"); // hotspot change 1160 if (dirp->handle != INVALID_HANDLE_VALUE) { 1161 if (!FindClose(dirp->handle)) { 1162 errno = EBADF; 1163 return -1; 1164 } 1165 dirp->handle = INVALID_HANDLE_VALUE; 1166 } 1167 free(dirp->path, mtInternal); 1168 free(dirp, mtInternal); 1169 return 0; 1170 } 1171 1172 // This must be hard coded because it's the system's temporary 1173 // directory not the java application's temp directory, ala java.io.tmpdir. 1174 const char* os::get_temp_directory() { 1175 static char path_buf[MAX_PATH]; 1176 if (GetTempPath(MAX_PATH, path_buf)>0) 1177 return path_buf; 1178 else{ 1179 path_buf[0]='\0'; 1180 return path_buf; 1181 } 1182 } 1183 1184 static bool file_exists(const char* filename) { 1185 if (filename == NULL || strlen(filename) == 0) { 1186 return false; 1187 } 1188 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES; 1189 } 1190 1191 bool os::dll_build_name(char *buffer, size_t buflen, 1192 const char* pname, const char* fname) { 1193 bool retval = false; 1194 const size_t pnamelen = pname ? strlen(pname) : 0; 1195 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0; 1196 1197 // Return error on buffer overflow. 1198 if (pnamelen + strlen(fname) + 10 > buflen) { 1199 return retval; 1200 } 1201 1202 if (pnamelen == 0) { 1203 jio_snprintf(buffer, buflen, "%s.dll", fname); 1204 retval = true; 1205 } else if (c == ':' || c == '\\') { 1206 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname); 1207 retval = true; 1208 } else if (strchr(pname, *os::path_separator()) != NULL) { 1209 int n; 1210 char** pelements = split_path(pname, &n); 1211 if (pelements == NULL) { 1212 return false; 1213 } 1214 for (int i = 0 ; i < n ; i++) { 1215 char* path = pelements[i]; 1216 // Really shouldn't be NULL, but check can't hurt 1217 size_t plen = (path == NULL) ? 0 : strlen(path); 1218 if (plen == 0) { 1219 continue; // skip the empty path values 1220 } 1221 const char lastchar = path[plen - 1]; 1222 if (lastchar == ':' || lastchar == '\\') { 1223 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname); 1224 } else { 1225 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname); 1226 } 1227 if (file_exists(buffer)) { 1228 retval = true; 1229 break; 1230 } 1231 } 1232 // release the storage 1233 for (int i = 0 ; i < n ; i++) { 1234 if (pelements[i] != NULL) { 1235 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); 1236 } 1237 } 1238 if (pelements != NULL) { 1239 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); 1240 } 1241 } else { 1242 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname); 1243 retval = true; 1244 } 1245 return retval; 1246 } 1247 1248 // Needs to be in os specific directory because windows requires another 1249 // header file <direct.h> 1250 const char* os::get_current_directory(char *buf, size_t buflen) { 1251 int n = static_cast<int>(buflen); 1252 if (buflen > INT_MAX) n = INT_MAX; 1253 return _getcwd(buf, n); 1254 } 1255 1256 //----------------------------------------------------------- 1257 // Helper functions for fatal error handler 1258 #ifdef _WIN64 1259 // Helper routine which returns true if address in 1260 // within the NTDLL address space. 1261 // 1262 static bool _addr_in_ntdll( address addr ) 1263 { 1264 HMODULE hmod; 1265 MODULEINFO minfo; 1266 1267 hmod = GetModuleHandle("NTDLL.DLL"); 1268 if ( hmod == NULL ) return false; 1269 if ( !os::PSApiDll::GetModuleInformation( GetCurrentProcess(), hmod, 1270 &minfo, sizeof(MODULEINFO)) ) 1271 return false; 1272 1273 if ( (addr >= minfo.lpBaseOfDll) && 1274 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) 1275 return true; 1276 else 1277 return false; 1278 } 1279 #endif 1280 1281 1282 // Enumerate all modules for a given process ID 1283 // 1284 // Notice that Windows 95/98/Me and Windows NT/2000/XP have 1285 // different API for doing this. We use PSAPI.DLL on NT based 1286 // Windows and ToolHelp on 95/98/Me. 1287 1288 // Callback function that is called by enumerate_modules() on 1289 // every DLL module. 1290 // Input parameters: 1291 // int pid, 1292 // char* module_file_name, 1293 // address module_base_addr, 1294 // unsigned module_size, 1295 // void* param 1296 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *); 1297 1298 // enumerate_modules for Windows NT, using PSAPI 1299 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param) 1300 { 1301 HANDLE hProcess ; 1302 1303 # define MAX_NUM_MODULES 128 1304 HMODULE modules[MAX_NUM_MODULES]; 1305 static char filename[ MAX_PATH ]; 1306 int result = 0; 1307 1308 if (!os::PSApiDll::PSApiAvailable()) { 1309 return 0; 1310 } 1311 1312 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1313 FALSE, pid ) ; 1314 if (hProcess == NULL) return 0; 1315 1316 DWORD size_needed; 1317 if (!os::PSApiDll::EnumProcessModules(hProcess, modules, 1318 sizeof(modules), &size_needed)) { 1319 CloseHandle( hProcess ); 1320 return 0; 1321 } 1322 1323 // number of modules that are currently loaded 1324 int num_modules = size_needed / sizeof(HMODULE); 1325 1326 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1327 // Get Full pathname: 1328 if(!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i], 1329 filename, sizeof(filename))) { 1330 filename[0] = '\0'; 1331 } 1332 1333 MODULEINFO modinfo; 1334 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i], 1335 &modinfo, sizeof(modinfo))) { 1336 modinfo.lpBaseOfDll = NULL; 1337 modinfo.SizeOfImage = 0; 1338 } 1339 1340 // Invoke callback function 1341 result = func(pid, filename, (address)modinfo.lpBaseOfDll, 1342 modinfo.SizeOfImage, param); 1343 if (result) break; 1344 } 1345 1346 CloseHandle( hProcess ) ; 1347 return result; 1348 } 1349 1350 1351 // enumerate_modules for Windows 95/98/ME, using TOOLHELP 1352 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param) 1353 { 1354 HANDLE hSnapShot ; 1355 static MODULEENTRY32 modentry ; 1356 int result = 0; 1357 1358 if (!os::Kernel32Dll::HelpToolsAvailable()) { 1359 return 0; 1360 } 1361 1362 // Get a handle to a Toolhelp snapshot of the system 1363 hSnapShot = os::Kernel32Dll::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ; 1364 if( hSnapShot == INVALID_HANDLE_VALUE ) { 1365 return FALSE ; 1366 } 1367 1368 // iterate through all modules 1369 modentry.dwSize = sizeof(MODULEENTRY32) ; 1370 bool not_done = os::Kernel32Dll::Module32First( hSnapShot, &modentry ) != 0; 1371 1372 while( not_done ) { 1373 // invoke the callback 1374 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr, 1375 modentry.modBaseSize, param); 1376 if (result) break; 1377 1378 modentry.dwSize = sizeof(MODULEENTRY32) ; 1379 not_done = os::Kernel32Dll::Module32Next( hSnapShot, &modentry ) != 0; 1380 } 1381 1382 CloseHandle(hSnapShot); 1383 return result; 1384 } 1385 1386 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param ) 1387 { 1388 // Get current process ID if caller doesn't provide it. 1389 if (!pid) pid = os::current_process_id(); 1390 1391 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param); 1392 else return _enumerate_modules_windows(pid, func, param); 1393 } 1394 1395 struct _modinfo { 1396 address addr; 1397 char* full_path; // point to a char buffer 1398 int buflen; // size of the buffer 1399 address base_addr; 1400 }; 1401 1402 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr, 1403 unsigned size, void * param) { 1404 struct _modinfo *pmod = (struct _modinfo *)param; 1405 if (!pmod) return -1; 1406 1407 if (base_addr <= pmod->addr && 1408 base_addr+size > pmod->addr) { 1409 // if a buffer is provided, copy path name to the buffer 1410 if (pmod->full_path) { 1411 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1412 } 1413 pmod->base_addr = base_addr; 1414 return 1; 1415 } 1416 return 0; 1417 } 1418 1419 bool os::dll_address_to_library_name(address addr, char* buf, 1420 int buflen, int* offset) { 1421 // buf is not optional, but offset is optional 1422 assert(buf != NULL, "sanity check"); 1423 1424 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1425 // return the full path to the DLL file, sometimes it returns path 1426 // to the corresponding PDB file (debug info); sometimes it only 1427 // returns partial path, which makes life painful. 1428 1429 struct _modinfo mi; 1430 mi.addr = addr; 1431 mi.full_path = buf; 1432 mi.buflen = buflen; 1433 int pid = os::current_process_id(); 1434 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) { 1435 // buf already contains path name 1436 if (offset) *offset = addr - mi.base_addr; 1437 return true; 1438 } 1439 1440 buf[0] = '\0'; 1441 if (offset) *offset = -1; 1442 return false; 1443 } 1444 1445 bool os::dll_address_to_function_name(address addr, char *buf, 1446 int buflen, int *offset) { 1447 // buf is not optional, but offset is optional 1448 assert(buf != NULL, "sanity check"); 1449 1450 if (Decoder::decode(addr, buf, buflen, offset)) { 1451 return true; 1452 } 1453 if (offset != NULL) *offset = -1; 1454 buf[0] = '\0'; 1455 return false; 1456 } 1457 1458 // save the start and end address of jvm.dll into param[0] and param[1] 1459 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr, 1460 unsigned size, void * param) { 1461 if (!param) return -1; 1462 1463 if (base_addr <= (address)_locate_jvm_dll && 1464 base_addr+size > (address)_locate_jvm_dll) { 1465 ((address*)param)[0] = base_addr; 1466 ((address*)param)[1] = base_addr + size; 1467 return 1; 1468 } 1469 return 0; 1470 } 1471 1472 address vm_lib_location[2]; // start and end address of jvm.dll 1473 1474 // check if addr is inside jvm.dll 1475 bool os::address_is_in_vm(address addr) { 1476 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1477 int pid = os::current_process_id(); 1478 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) { 1479 assert(false, "Can't find jvm module."); 1480 return false; 1481 } 1482 } 1483 1484 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1485 } 1486 1487 // print module info; param is outputStream* 1488 static int _print_module(int pid, char* fname, address base, 1489 unsigned size, void* param) { 1490 if (!param) return -1; 1491 1492 outputStream* st = (outputStream*)param; 1493 1494 address end_addr = base + size; 1495 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname); 1496 return 0; 1497 } 1498 1499 // Loads .dll/.so and 1500 // in case of error it checks if .dll/.so was built for the 1501 // same architecture as Hotspot is running on 1502 void * os::dll_load(const char *name, char *ebuf, int ebuflen) 1503 { 1504 void * result = LoadLibrary(name); 1505 if (result != NULL) 1506 { 1507 return result; 1508 } 1509 1510 DWORD errcode = GetLastError(); 1511 if (errcode == ERROR_MOD_NOT_FOUND) { 1512 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1); 1513 ebuf[ebuflen-1]='\0'; 1514 return NULL; 1515 } 1516 1517 // Parsing dll below 1518 // If we can read dll-info and find that dll was built 1519 // for an architecture other than Hotspot is running in 1520 // - then print to buffer "DLL was built for a different architecture" 1521 // else call os::lasterror to obtain system error message 1522 1523 // Read system error message into ebuf 1524 // It may or may not be overwritten below (in the for loop and just above) 1525 lasterror(ebuf, (size_t) ebuflen); 1526 ebuf[ebuflen-1]='\0'; 1527 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0); 1528 if (file_descriptor<0) 1529 { 1530 return NULL; 1531 } 1532 1533 uint32_t signature_offset; 1534 uint16_t lib_arch=0; 1535 bool failed_to_get_lib_arch= 1536 ( 1537 //Go to position 3c in the dll 1538 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0) 1539 || 1540 // Read loacation of signature 1541 (sizeof(signature_offset)!= 1542 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset)))) 1543 || 1544 //Go to COFF File Header in dll 1545 //that is located after"signature" (4 bytes long) 1546 (os::seek_to_file_offset(file_descriptor, 1547 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0) 1548 || 1549 //Read field that contains code of architecture 1550 // that dll was build for 1551 (sizeof(lib_arch)!= 1552 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch)))) 1553 ); 1554 1555 ::close(file_descriptor); 1556 if (failed_to_get_lib_arch) 1557 { 1558 // file i/o error - report os::lasterror(...) msg 1559 return NULL; 1560 } 1561 1562 typedef struct 1563 { 1564 uint16_t arch_code; 1565 char* arch_name; 1566 } arch_t; 1567 1568 static const arch_t arch_array[]={ 1569 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1570 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1571 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1572 }; 1573 #if (defined _M_IA64) 1574 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64; 1575 #elif (defined _M_AMD64) 1576 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64; 1577 #elif (defined _M_IX86) 1578 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386; 1579 #else 1580 #error Method os::dll_load requires that one of following \ 1581 is defined :_M_IA64,_M_AMD64 or _M_IX86 1582 #endif 1583 1584 1585 // Obtain a string for printf operation 1586 // lib_arch_str shall contain string what platform this .dll was built for 1587 // running_arch_str shall string contain what platform Hotspot was built for 1588 char *running_arch_str=NULL,*lib_arch_str=NULL; 1589 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++) 1590 { 1591 if (lib_arch==arch_array[i].arch_code) 1592 lib_arch_str=arch_array[i].arch_name; 1593 if (running_arch==arch_array[i].arch_code) 1594 running_arch_str=arch_array[i].arch_name; 1595 } 1596 1597 assert(running_arch_str, 1598 "Didn't find runing architecture code in arch_array"); 1599 1600 // If the architure is right 1601 // but some other error took place - report os::lasterror(...) msg 1602 if (lib_arch == running_arch) 1603 { 1604 return NULL; 1605 } 1606 1607 if (lib_arch_str!=NULL) 1608 { 1609 ::_snprintf(ebuf, ebuflen-1, 1610 "Can't load %s-bit .dll on a %s-bit platform", 1611 lib_arch_str,running_arch_str); 1612 } 1613 else 1614 { 1615 // don't know what architecture this dll was build for 1616 ::_snprintf(ebuf, ebuflen-1, 1617 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1618 lib_arch,running_arch_str); 1619 } 1620 1621 return NULL; 1622 } 1623 1624 1625 void os::print_dll_info(outputStream *st) { 1626 int pid = os::current_process_id(); 1627 st->print_cr("Dynamic libraries:"); 1628 enumerate_modules(pid, _print_module, (void *)st); 1629 } 1630 1631 void os::print_os_info_brief(outputStream* st) { 1632 os::print_os_info(st); 1633 } 1634 1635 void os::print_os_info(outputStream* st) { 1636 st->print("OS:"); 1637 1638 os::win32::print_windows_version(st); 1639 } 1640 1641 void os::win32::print_windows_version(outputStream* st) { 1642 OSVERSIONINFOEX osvi; 1643 SYSTEM_INFO si; 1644 1645 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1646 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1647 1648 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1649 st->print_cr("N/A"); 1650 return; 1651 } 1652 1653 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion; 1654 1655 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1656 if (os_vers >= 5002) { 1657 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1658 // find out whether we are running on 64 bit processor or not. 1659 if (os::Kernel32Dll::GetNativeSystemInfoAvailable()) { 1660 os::Kernel32Dll::GetNativeSystemInfo(&si); 1661 } else { 1662 GetSystemInfo(&si); 1663 } 1664 } 1665 1666 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) { 1667 switch (os_vers) { 1668 case 3051: st->print(" Windows NT 3.51"); break; 1669 case 4000: st->print(" Windows NT 4.0"); break; 1670 case 5000: st->print(" Windows 2000"); break; 1671 case 5001: st->print(" Windows XP"); break; 1672 case 5002: 1673 if (osvi.wProductType == VER_NT_WORKSTATION && 1674 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1675 st->print(" Windows XP x64 Edition"); 1676 } else { 1677 st->print(" Windows Server 2003 family"); 1678 } 1679 break; 1680 1681 case 6000: 1682 if (osvi.wProductType == VER_NT_WORKSTATION) { 1683 st->print(" Windows Vista"); 1684 } else { 1685 st->print(" Windows Server 2008"); 1686 } 1687 break; 1688 1689 case 6001: 1690 if (osvi.wProductType == VER_NT_WORKSTATION) { 1691 st->print(" Windows 7"); 1692 } else { 1693 st->print(" Windows Server 2008 R2"); 1694 } 1695 break; 1696 1697 case 6002: 1698 if (osvi.wProductType == VER_NT_WORKSTATION) { 1699 st->print(" Windows 8"); 1700 } else { 1701 st->print(" Windows Server 2012"); 1702 } 1703 break; 1704 1705 case 6003: 1706 if (osvi.wProductType == VER_NT_WORKSTATION) { 1707 st->print(" Windows 8.1"); 1708 } else { 1709 st->print(" Windows Server 2012 R2"); 1710 } 1711 break; 1712 1713 default: // future os 1714 // Unrecognized windows, print out its major and minor versions 1715 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1716 } 1717 } else { 1718 switch (os_vers) { 1719 case 4000: st->print(" Windows 95"); break; 1720 case 4010: st->print(" Windows 98"); break; 1721 case 4090: st->print(" Windows Me"); break; 1722 default: // future windows, print out its major and minor versions 1723 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1724 } 1725 } 1726 1727 if (os_vers >= 6000 && si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1728 st->print(" , 64 bit"); 1729 } 1730 1731 st->print(" Build %d", osvi.dwBuildNumber); 1732 st->print(" %s", osvi.szCSDVersion); // service pack 1733 st->cr(); 1734 } 1735 1736 void os::pd_print_cpu_info(outputStream* st) { 1737 // Nothing to do for now. 1738 } 1739 1740 void os::print_memory_info(outputStream* st) { 1741 st->print("Memory:"); 1742 st->print(" %dk page", os::vm_page_size()>>10); 1743 1744 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1745 // value if total memory is larger than 4GB 1746 MEMORYSTATUSEX ms; 1747 ms.dwLength = sizeof(ms); 1748 GlobalMemoryStatusEx(&ms); 1749 1750 st->print(", physical %uk", os::physical_memory() >> 10); 1751 st->print("(%uk free)", os::available_memory() >> 10); 1752 1753 st->print(", swap %uk", ms.ullTotalPageFile >> 10); 1754 st->print("(%uk free)", ms.ullAvailPageFile >> 10); 1755 st->cr(); 1756 } 1757 1758 void os::print_siginfo(outputStream *st, void *siginfo) { 1759 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1760 st->print("siginfo:"); 1761 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1762 1763 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1764 er->NumberParameters >= 2) { 1765 switch (er->ExceptionInformation[0]) { 1766 case 0: st->print(", reading address"); break; 1767 case 1: st->print(", writing address"); break; 1768 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1769 er->ExceptionInformation[0]); 1770 } 1771 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1772 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1773 er->NumberParameters >= 2 && UseSharedSpaces) { 1774 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1775 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1776 st->print("\n\nError accessing class data sharing archive." \ 1777 " Mapped file inaccessible during execution, " \ 1778 " possible disk/network problem."); 1779 } 1780 } else { 1781 int num = er->NumberParameters; 1782 if (num > 0) { 1783 st->print(", ExceptionInformation="); 1784 for (int i = 0; i < num; i++) { 1785 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1786 } 1787 } 1788 } 1789 st->cr(); 1790 } 1791 1792 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1793 // do nothing 1794 } 1795 1796 static char saved_jvm_path[MAX_PATH] = {0}; 1797 1798 // Find the full path to the current module, jvm.dll 1799 void os::jvm_path(char *buf, jint buflen) { 1800 // Error checking. 1801 if (buflen < MAX_PATH) { 1802 assert(false, "must use a large-enough buffer"); 1803 buf[0] = '\0'; 1804 return; 1805 } 1806 // Lazy resolve the path to current module. 1807 if (saved_jvm_path[0] != 0) { 1808 strcpy(buf, saved_jvm_path); 1809 return; 1810 } 1811 1812 buf[0] = '\0'; 1813 if (Arguments::created_by_gamma_launcher()) { 1814 // Support for the gamma launcher. Check for an 1815 // JAVA_HOME environment variable 1816 // and fix up the path so it looks like 1817 // libjvm.so is installed there (append a fake suffix 1818 // hotspot/libjvm.so). 1819 char* java_home_var = ::getenv("JAVA_HOME"); 1820 if (java_home_var != NULL && java_home_var[0] != 0) { 1821 1822 strncpy(buf, java_home_var, buflen); 1823 1824 // determine if this is a legacy image or modules image 1825 // modules image doesn't have "jre" subdirectory 1826 size_t len = strlen(buf); 1827 char* jrebin_p = buf + len; 1828 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1829 if (0 != _access(buf, 0)) { 1830 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1831 } 1832 len = strlen(buf); 1833 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1834 } 1835 } 1836 1837 if(buf[0] == '\0') { 1838 GetModuleFileName(vm_lib_handle, buf, buflen); 1839 } 1840 strcpy(saved_jvm_path, buf); 1841 } 1842 1843 1844 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1845 #ifndef _WIN64 1846 st->print("_"); 1847 #endif 1848 } 1849 1850 1851 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1852 #ifndef _WIN64 1853 st->print("@%d", args_size * sizeof(int)); 1854 #endif 1855 } 1856 1857 // This method is a copy of JDK's sysGetLastErrorString 1858 // from src/windows/hpi/src/system_md.c 1859 1860 size_t os::lasterror(char* buf, size_t len) { 1861 DWORD errval; 1862 1863 if ((errval = GetLastError()) != 0) { 1864 // DOS error 1865 size_t n = (size_t)FormatMessage( 1866 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1867 NULL, 1868 errval, 1869 0, 1870 buf, 1871 (DWORD)len, 1872 NULL); 1873 if (n > 3) { 1874 // Drop final '.', CR, LF 1875 if (buf[n - 1] == '\n') n--; 1876 if (buf[n - 1] == '\r') n--; 1877 if (buf[n - 1] == '.') n--; 1878 buf[n] = '\0'; 1879 } 1880 return n; 1881 } 1882 1883 if (errno != 0) { 1884 // C runtime error that has no corresponding DOS error code 1885 const char* s = strerror(errno); 1886 size_t n = strlen(s); 1887 if (n >= len) n = len - 1; 1888 strncpy(buf, s, n); 1889 buf[n] = '\0'; 1890 return n; 1891 } 1892 1893 return 0; 1894 } 1895 1896 int os::get_last_error() { 1897 DWORD error = GetLastError(); 1898 if (error == 0) 1899 error = errno; 1900 return (int)error; 1901 } 1902 1903 // sun.misc.Signal 1904 // NOTE that this is a workaround for an apparent kernel bug where if 1905 // a signal handler for SIGBREAK is installed then that signal handler 1906 // takes priority over the console control handler for CTRL_CLOSE_EVENT. 1907 // See bug 4416763. 1908 static void (*sigbreakHandler)(int) = NULL; 1909 1910 static void UserHandler(int sig, void *siginfo, void *context) { 1911 os::signal_notify(sig); 1912 // We need to reinstate the signal handler each time... 1913 os::signal(sig, (void*)UserHandler); 1914 } 1915 1916 void* os::user_handler() { 1917 return (void*) UserHandler; 1918 } 1919 1920 void* os::signal(int signal_number, void* handler) { 1921 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1922 void (*oldHandler)(int) = sigbreakHandler; 1923 sigbreakHandler = (void (*)(int)) handler; 1924 return (void*) oldHandler; 1925 } else { 1926 return (void*)::signal(signal_number, (void (*)(int))handler); 1927 } 1928 } 1929 1930 void os::signal_raise(int signal_number) { 1931 raise(signal_number); 1932 } 1933 1934 // The Win32 C runtime library maps all console control events other than ^C 1935 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1936 // logoff, and shutdown events. We therefore install our own console handler 1937 // that raises SIGTERM for the latter cases. 1938 // 1939 static BOOL WINAPI consoleHandler(DWORD event) { 1940 switch(event) { 1941 case CTRL_C_EVENT: 1942 if (is_error_reported()) { 1943 // Ctrl-C is pressed during error reporting, likely because the error 1944 // handler fails to abort. Let VM die immediately. 1945 os::die(); 1946 } 1947 1948 os::signal_raise(SIGINT); 1949 return TRUE; 1950 break; 1951 case CTRL_BREAK_EVENT: 1952 if (sigbreakHandler != NULL) { 1953 (*sigbreakHandler)(SIGBREAK); 1954 } 1955 return TRUE; 1956 break; 1957 case CTRL_LOGOFF_EVENT: { 1958 // Don't terminate JVM if it is running in a non-interactive session, 1959 // such as a service process. 1960 USEROBJECTFLAGS flags; 1961 HANDLE handle = GetProcessWindowStation(); 1962 if (handle != NULL && 1963 GetUserObjectInformation(handle, UOI_FLAGS, &flags, 1964 sizeof( USEROBJECTFLAGS), NULL)) { 1965 // If it is a non-interactive session, let next handler to deal 1966 // with it. 1967 if ((flags.dwFlags & WSF_VISIBLE) == 0) { 1968 return FALSE; 1969 } 1970 } 1971 } 1972 case CTRL_CLOSE_EVENT: 1973 case CTRL_SHUTDOWN_EVENT: 1974 os::signal_raise(SIGTERM); 1975 return TRUE; 1976 break; 1977 default: 1978 break; 1979 } 1980 return FALSE; 1981 } 1982 1983 /* 1984 * The following code is moved from os.cpp for making this 1985 * code platform specific, which it is by its very nature. 1986 */ 1987 1988 // Return maximum OS signal used + 1 for internal use only 1989 // Used as exit signal for signal_thread 1990 int os::sigexitnum_pd(){ 1991 return NSIG; 1992 } 1993 1994 // a counter for each possible signal value, including signal_thread exit signal 1995 static volatile jint pending_signals[NSIG+1] = { 0 }; 1996 static HANDLE sig_sem = NULL; 1997 1998 void os::signal_init_pd() { 1999 // Initialize signal structures 2000 memset((void*)pending_signals, 0, sizeof(pending_signals)); 2001 2002 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 2003 2004 // Programs embedding the VM do not want it to attempt to receive 2005 // events like CTRL_LOGOFF_EVENT, which are used to implement the 2006 // shutdown hooks mechanism introduced in 1.3. For example, when 2007 // the VM is run as part of a Windows NT service (i.e., a servlet 2008 // engine in a web server), the correct behavior is for any console 2009 // control handler to return FALSE, not TRUE, because the OS's 2010 // "final" handler for such events allows the process to continue if 2011 // it is a service (while terminating it if it is not a service). 2012 // To make this behavior uniform and the mechanism simpler, we 2013 // completely disable the VM's usage of these console events if -Xrs 2014 // (=ReduceSignalUsage) is specified. This means, for example, that 2015 // the CTRL-BREAK thread dump mechanism is also disabled in this 2016 // case. See bugs 4323062, 4345157, and related bugs. 2017 2018 if (!ReduceSignalUsage) { 2019 // Add a CTRL-C handler 2020 SetConsoleCtrlHandler(consoleHandler, TRUE); 2021 } 2022 } 2023 2024 void os::signal_notify(int signal_number) { 2025 BOOL ret; 2026 if (sig_sem != NULL) { 2027 Atomic::inc(&pending_signals[signal_number]); 2028 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2029 assert(ret != 0, "ReleaseSemaphore() failed"); 2030 } 2031 } 2032 2033 static int check_pending_signals(bool wait_for_signal) { 2034 DWORD ret; 2035 while (true) { 2036 for (int i = 0; i < NSIG + 1; i++) { 2037 jint n = pending_signals[i]; 2038 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2039 return i; 2040 } 2041 } 2042 if (!wait_for_signal) { 2043 return -1; 2044 } 2045 2046 JavaThread *thread = JavaThread::current(); 2047 2048 ThreadBlockInVM tbivm(thread); 2049 2050 bool threadIsSuspended; 2051 do { 2052 thread->set_suspend_equivalent(); 2053 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2054 ret = ::WaitForSingleObject(sig_sem, INFINITE); 2055 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 2056 2057 // were we externally suspended while we were waiting? 2058 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2059 if (threadIsSuspended) { 2060 // 2061 // The semaphore has been incremented, but while we were waiting 2062 // another thread suspended us. We don't want to continue running 2063 // while suspended because that would surprise the thread that 2064 // suspended us. 2065 // 2066 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2067 assert(ret != 0, "ReleaseSemaphore() failed"); 2068 2069 thread->java_suspend_self(); 2070 } 2071 } while (threadIsSuspended); 2072 } 2073 } 2074 2075 int os::signal_lookup() { 2076 return check_pending_signals(false); 2077 } 2078 2079 int os::signal_wait() { 2080 return check_pending_signals(true); 2081 } 2082 2083 // Implicit OS exception handling 2084 2085 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) { 2086 JavaThread* thread = JavaThread::current(); 2087 // Save pc in thread 2088 #ifdef _M_IA64 2089 // Do not blow up if no thread info available. 2090 if (thread) { 2091 // Saving PRECISE pc (with slot information) in thread. 2092 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress; 2093 // Convert precise PC into "Unix" format 2094 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2); 2095 thread->set_saved_exception_pc((address)precise_pc); 2096 } 2097 // Set pc to handler 2098 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 2099 // Clear out psr.ri (= Restart Instruction) in order to continue 2100 // at the beginning of the target bundle. 2101 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF; 2102 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!"); 2103 #elif _M_AMD64 2104 // Do not blow up if no thread info available. 2105 if (thread) { 2106 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip); 2107 } 2108 // Set pc to handler 2109 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 2110 #else 2111 // Do not blow up if no thread info available. 2112 if (thread) { 2113 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip); 2114 } 2115 // Set pc to handler 2116 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler; 2117 #endif 2118 2119 // Continue the execution 2120 return EXCEPTION_CONTINUE_EXECUTION; 2121 } 2122 2123 2124 // Used for PostMortemDump 2125 extern "C" void safepoints(); 2126 extern "C" void find(int x); 2127 extern "C" void events(); 2128 2129 // According to Windows API documentation, an illegal instruction sequence should generate 2130 // the 0xC000001C exception code. However, real world experience shows that occasionnaly 2131 // the execution of an illegal instruction can generate the exception code 0xC000001E. This 2132 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 2133 2134 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 2135 2136 // From "Execution Protection in the Windows Operating System" draft 0.35 2137 // Once a system header becomes available, the "real" define should be 2138 // included or copied here. 2139 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2140 2141 // Handle NAT Bit consumption on IA64. 2142 #ifdef _M_IA64 2143 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION 2144 #endif 2145 2146 // Windows Vista/2008 heap corruption check 2147 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374 2148 2149 #define def_excpt(val) #val, val 2150 2151 struct siglabel { 2152 char *name; 2153 int number; 2154 }; 2155 2156 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual 2157 // C++ compiler contain this error code. Because this is a compiler-generated 2158 // error, the code is not listed in the Win32 API header files. 2159 // The code is actually a cryptic mnemonic device, with the initial "E" 2160 // standing for "exception" and the final 3 bytes (0x6D7363) representing the 2161 // ASCII values of "msc". 2162 2163 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363 2164 2165 2166 struct siglabel exceptlabels[] = { 2167 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2168 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2169 def_excpt(EXCEPTION_BREAKPOINT), 2170 def_excpt(EXCEPTION_SINGLE_STEP), 2171 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2172 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2173 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2174 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2175 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2176 def_excpt(EXCEPTION_FLT_OVERFLOW), 2177 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2178 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2179 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2180 def_excpt(EXCEPTION_INT_OVERFLOW), 2181 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2182 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2183 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2184 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2185 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2186 def_excpt(EXCEPTION_STACK_OVERFLOW), 2187 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2188 def_excpt(EXCEPTION_GUARD_PAGE), 2189 def_excpt(EXCEPTION_INVALID_HANDLE), 2190 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION), 2191 def_excpt(EXCEPTION_HEAP_CORRUPTION), 2192 #ifdef _M_IA64 2193 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION), 2194 #endif 2195 NULL, 0 2196 }; 2197 2198 const char* os::exception_name(int exception_code, char *buf, size_t size) { 2199 for (int i = 0; exceptlabels[i].name != NULL; i++) { 2200 if (exceptlabels[i].number == exception_code) { 2201 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2202 return buf; 2203 } 2204 } 2205 2206 return NULL; 2207 } 2208 2209 //----------------------------------------------------------------------------- 2210 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2211 // handle exception caused by idiv; should only happen for -MinInt/-1 2212 // (division by zero is handled explicitly) 2213 #ifdef _M_IA64 2214 assert(0, "Fix Handle_IDiv_Exception"); 2215 #elif _M_AMD64 2216 PCONTEXT ctx = exceptionInfo->ContextRecord; 2217 address pc = (address)ctx->Rip; 2218 assert(pc[0] == 0xF7, "not an idiv opcode"); 2219 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2220 assert(ctx->Rax == min_jint, "unexpected idiv exception"); 2221 // set correct result values and continue after idiv instruction 2222 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2223 ctx->Rax = (DWORD)min_jint; // result 2224 ctx->Rdx = (DWORD)0; // remainder 2225 // Continue the execution 2226 #else 2227 PCONTEXT ctx = exceptionInfo->ContextRecord; 2228 address pc = (address)ctx->Eip; 2229 assert(pc[0] == 0xF7, "not an idiv opcode"); 2230 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2231 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2232 // set correct result values and continue after idiv instruction 2233 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2234 ctx->Eax = (DWORD)min_jint; // result 2235 ctx->Edx = (DWORD)0; // remainder 2236 // Continue the execution 2237 #endif 2238 return EXCEPTION_CONTINUE_EXECUTION; 2239 } 2240 2241 //----------------------------------------------------------------------------- 2242 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2243 PCONTEXT ctx = exceptionInfo->ContextRecord; 2244 #ifndef _WIN64 2245 // handle exception caused by native method modifying control word 2246 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2247 2248 switch (exception_code) { 2249 case EXCEPTION_FLT_DENORMAL_OPERAND: 2250 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2251 case EXCEPTION_FLT_INEXACT_RESULT: 2252 case EXCEPTION_FLT_INVALID_OPERATION: 2253 case EXCEPTION_FLT_OVERFLOW: 2254 case EXCEPTION_FLT_STACK_CHECK: 2255 case EXCEPTION_FLT_UNDERFLOW: 2256 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2257 if (fp_control_word != ctx->FloatSave.ControlWord) { 2258 // Restore FPCW and mask out FLT exceptions 2259 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2260 // Mask out pending FLT exceptions 2261 ctx->FloatSave.StatusWord &= 0xffffff00; 2262 return EXCEPTION_CONTINUE_EXECUTION; 2263 } 2264 } 2265 2266 if (prev_uef_handler != NULL) { 2267 // We didn't handle this exception so pass it to the previous 2268 // UnhandledExceptionFilter. 2269 return (prev_uef_handler)(exceptionInfo); 2270 } 2271 #else // !_WIN64 2272 /* 2273 On Windows, the mxcsr control bits are non-volatile across calls 2274 See also CR 6192333 2275 */ 2276 jint MxCsr = INITIAL_MXCSR; 2277 // we can't use StubRoutines::addr_mxcsr_std() 2278 // because in Win64 mxcsr is not saved there 2279 if (MxCsr != ctx->MxCsr) { 2280 ctx->MxCsr = MxCsr; 2281 return EXCEPTION_CONTINUE_EXECUTION; 2282 } 2283 #endif // !_WIN64 2284 2285 return EXCEPTION_CONTINUE_SEARCH; 2286 } 2287 2288 // Fatal error reporting is single threaded so we can make this a 2289 // static and preallocated. If it's more than MAX_PATH silently ignore 2290 // it. 2291 static char saved_error_file[MAX_PATH] = {0}; 2292 2293 void os::set_error_file(const char *logfile) { 2294 if (strlen(logfile) <= MAX_PATH) { 2295 strncpy(saved_error_file, logfile, MAX_PATH); 2296 } 2297 } 2298 2299 static inline void report_error(Thread* t, DWORD exception_code, 2300 address addr, void* siginfo, void* context) { 2301 VMError err(t, exception_code, addr, siginfo, context); 2302 err.report_and_die(); 2303 2304 // If UseOsErrorReporting, this will return here and save the error file 2305 // somewhere where we can find it in the minidump. 2306 } 2307 2308 //----------------------------------------------------------------------------- 2309 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2310 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2311 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2312 #ifdef _M_IA64 2313 // On Itanium, we need the "precise pc", which has the slot number coded 2314 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format). 2315 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress; 2316 // Convert the pc to "Unix format", which has the slot number coded 2317 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2 2318 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction" 2319 // information is saved in the Unix format. 2320 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2)); 2321 #elif _M_AMD64 2322 address pc = (address) exceptionInfo->ContextRecord->Rip; 2323 #else 2324 address pc = (address) exceptionInfo->ContextRecord->Eip; 2325 #endif 2326 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 2327 2328 // Handle SafeFetch32 and SafeFetchN exceptions. 2329 if (StubRoutines::is_safefetch_fault(pc)) { 2330 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc)); 2331 } 2332 2333 #ifndef _WIN64 2334 // Execution protection violation - win32 running on AMD64 only 2335 // Handled first to avoid misdiagnosis as a "normal" access violation; 2336 // This is safe to do because we have a new/unique ExceptionInformation 2337 // code for this condition. 2338 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2339 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2340 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2341 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2342 2343 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2344 int page_size = os::vm_page_size(); 2345 2346 // Make sure the pc and the faulting address are sane. 2347 // 2348 // If an instruction spans a page boundary, and the page containing 2349 // the beginning of the instruction is executable but the following 2350 // page is not, the pc and the faulting address might be slightly 2351 // different - we still want to unguard the 2nd page in this case. 2352 // 2353 // 15 bytes seems to be a (very) safe value for max instruction size. 2354 bool pc_is_near_addr = 2355 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2356 bool instr_spans_page_boundary = 2357 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2358 (intptr_t) page_size) > 0); 2359 2360 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2361 static volatile address last_addr = 2362 (address) os::non_memory_address_word(); 2363 2364 // In conservative mode, don't unguard unless the address is in the VM 2365 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2366 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2367 2368 // Set memory to RWX and retry 2369 address page_start = 2370 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2371 bool res = os::protect_memory((char*) page_start, page_size, 2372 os::MEM_PROT_RWX); 2373 2374 if (PrintMiscellaneous && Verbose) { 2375 char buf[256]; 2376 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 2377 "at " INTPTR_FORMAT 2378 ", unguarding " INTPTR_FORMAT ": %s", addr, 2379 page_start, (res ? "success" : strerror(errno))); 2380 tty->print_raw_cr(buf); 2381 } 2382 2383 // Set last_addr so if we fault again at the same address, we don't 2384 // end up in an endless loop. 2385 // 2386 // There are two potential complications here. Two threads trapping 2387 // at the same address at the same time could cause one of the 2388 // threads to think it already unguarded, and abort the VM. Likely 2389 // very rare. 2390 // 2391 // The other race involves two threads alternately trapping at 2392 // different addresses and failing to unguard the page, resulting in 2393 // an endless loop. This condition is probably even more unlikely 2394 // than the first. 2395 // 2396 // Although both cases could be avoided by using locks or thread 2397 // local last_addr, these solutions are unnecessary complication: 2398 // this handler is a best-effort safety net, not a complete solution. 2399 // It is disabled by default and should only be used as a workaround 2400 // in case we missed any no-execute-unsafe VM code. 2401 2402 last_addr = addr; 2403 2404 return EXCEPTION_CONTINUE_EXECUTION; 2405 } 2406 } 2407 2408 // Last unguard failed or not unguarding 2409 tty->print_raw_cr("Execution protection violation"); 2410 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2411 exceptionInfo->ContextRecord); 2412 return EXCEPTION_CONTINUE_SEARCH; 2413 } 2414 } 2415 #endif // _WIN64 2416 2417 // Check to see if we caught the safepoint code in the 2418 // process of write protecting the memory serialization page. 2419 // It write enables the page immediately after protecting it 2420 // so just return. 2421 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { 2422 JavaThread* thread = (JavaThread*) t; 2423 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2424 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2425 if ( os::is_memory_serialize_page(thread, addr) ) { 2426 // Block current thread until the memory serialize page permission restored. 2427 os::block_on_serialize_page_trap(); 2428 return EXCEPTION_CONTINUE_EXECUTION; 2429 } 2430 } 2431 2432 if (t != NULL && t->is_Java_thread()) { 2433 JavaThread* thread = (JavaThread*) t; 2434 bool in_java = thread->thread_state() == _thread_in_Java; 2435 2436 // Handle potential stack overflows up front. 2437 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2438 if (os::uses_stack_guard_pages()) { 2439 #ifdef _M_IA64 2440 // Use guard page for register stack. 2441 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2442 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2443 // Check for a register stack overflow on Itanium 2444 if (thread->addr_inside_register_stack_red_zone(addr)) { 2445 // Fatal red zone violation happens if the Java program 2446 // catches a StackOverflow error and does so much processing 2447 // that it runs beyond the unprotected yellow guard zone. As 2448 // a result, we are out of here. 2449 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit."); 2450 } else if(thread->addr_inside_register_stack(addr)) { 2451 // Disable the yellow zone which sets the state that 2452 // we've got a stack overflow problem. 2453 if (thread->stack_yellow_zone_enabled()) { 2454 thread->disable_stack_yellow_zone(); 2455 } 2456 // Give us some room to process the exception. 2457 thread->disable_register_stack_guard(); 2458 // Tracing with +Verbose. 2459 if (Verbose) { 2460 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc); 2461 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr); 2462 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base()); 2463 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]", 2464 thread->register_stack_base(), 2465 thread->register_stack_base() + thread->stack_size()); 2466 } 2467 2468 // Reguard the permanent register stack red zone just to be sure. 2469 // We saw Windows silently disabling this without telling us. 2470 thread->enable_register_stack_red_zone(); 2471 2472 return Handle_Exception(exceptionInfo, 2473 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2474 } 2475 #endif 2476 if (thread->stack_yellow_zone_enabled()) { 2477 // Yellow zone violation. The o/s has unprotected the first yellow 2478 // zone page for us. Note: must call disable_stack_yellow_zone to 2479 // update the enabled status, even if the zone contains only one page. 2480 thread->disable_stack_yellow_zone(); 2481 // If not in java code, return and hope for the best. 2482 return in_java ? Handle_Exception(exceptionInfo, 2483 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2484 : EXCEPTION_CONTINUE_EXECUTION; 2485 } else { 2486 // Fatal red zone violation. 2487 thread->disable_stack_red_zone(); 2488 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2489 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2490 exceptionInfo->ContextRecord); 2491 return EXCEPTION_CONTINUE_SEARCH; 2492 } 2493 } else if (in_java) { 2494 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2495 // a one-time-only guard page, which it has released to us. The next 2496 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2497 return Handle_Exception(exceptionInfo, 2498 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2499 } else { 2500 // Can only return and hope for the best. Further stack growth will 2501 // result in an ACCESS_VIOLATION. 2502 return EXCEPTION_CONTINUE_EXECUTION; 2503 } 2504 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2505 // Either stack overflow or null pointer exception. 2506 if (in_java) { 2507 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2508 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2509 address stack_end = thread->stack_base() - thread->stack_size(); 2510 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2511 // Stack overflow. 2512 assert(!os::uses_stack_guard_pages(), 2513 "should be caught by red zone code above."); 2514 return Handle_Exception(exceptionInfo, 2515 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2516 } 2517 // 2518 // Check for safepoint polling and implicit null 2519 // We only expect null pointers in the stubs (vtable) 2520 // the rest are checked explicitly now. 2521 // 2522 CodeBlob* cb = CodeCache::find_blob(pc); 2523 if (cb != NULL) { 2524 if (os::is_poll_address(addr)) { 2525 address stub = SharedRuntime::get_poll_stub(pc); 2526 return Handle_Exception(exceptionInfo, stub); 2527 } 2528 } 2529 { 2530 #ifdef _WIN64 2531 // 2532 // If it's a legal stack address map the entire region in 2533 // 2534 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2535 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2536 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) { 2537 addr = (address)((uintptr_t)addr & 2538 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2539 os::commit_memory((char *)addr, thread->stack_base() - addr, 2540 !ExecMem); 2541 return EXCEPTION_CONTINUE_EXECUTION; 2542 } 2543 else 2544 #endif 2545 { 2546 // Null pointer exception. 2547 #ifdef _M_IA64 2548 // Process implicit null checks in compiled code. Note: Implicit null checks 2549 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs. 2550 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) { 2551 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format); 2552 // Handle implicit null check in UEP method entry 2553 if (cb && (cb->is_frame_complete_at(pc) || 2554 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) { 2555 if (Verbose) { 2556 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0); 2557 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format); 2558 tty->print_cr(" to addr " INTPTR_FORMAT, addr); 2559 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)", 2560 *(bundle_start + 1), *bundle_start); 2561 } 2562 return Handle_Exception(exceptionInfo, 2563 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL)); 2564 } 2565 } 2566 2567 // Implicit null checks were processed above. Hence, we should not reach 2568 // here in the usual case => die! 2569 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception"); 2570 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2571 exceptionInfo->ContextRecord); 2572 return EXCEPTION_CONTINUE_SEARCH; 2573 2574 #else // !IA64 2575 2576 // Windows 98 reports faulting addresses incorrectly 2577 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2578 !os::win32::is_nt()) { 2579 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2580 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2581 } 2582 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2583 exceptionInfo->ContextRecord); 2584 return EXCEPTION_CONTINUE_SEARCH; 2585 #endif 2586 } 2587 } 2588 } 2589 2590 #ifdef _WIN64 2591 // Special care for fast JNI field accessors. 2592 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2593 // in and the heap gets shrunk before the field access. 2594 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2595 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2596 if (addr != (address)-1) { 2597 return Handle_Exception(exceptionInfo, addr); 2598 } 2599 } 2600 #endif 2601 2602 // Stack overflow or null pointer exception in native code. 2603 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2604 exceptionInfo->ContextRecord); 2605 return EXCEPTION_CONTINUE_SEARCH; 2606 } // /EXCEPTION_ACCESS_VIOLATION 2607 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2608 #if defined _M_IA64 2609 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION || 2610 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) { 2611 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0); 2612 2613 // Compiled method patched to be non entrant? Following conditions must apply: 2614 // 1. must be first instruction in bundle 2615 // 2. must be a break instruction with appropriate code 2616 if((((uint64_t) pc & 0x0F) == 0) && 2617 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) { 2618 return Handle_Exception(exceptionInfo, 2619 (address)SharedRuntime::get_handle_wrong_method_stub()); 2620 } 2621 } // /EXCEPTION_ILLEGAL_INSTRUCTION 2622 #endif 2623 2624 2625 if (in_java) { 2626 switch (exception_code) { 2627 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2628 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2629 2630 case EXCEPTION_INT_OVERFLOW: 2631 return Handle_IDiv_Exception(exceptionInfo); 2632 2633 } // switch 2634 } 2635 if (((thread->thread_state() == _thread_in_Java) || 2636 (thread->thread_state() == _thread_in_native)) && 2637 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) 2638 { 2639 LONG result=Handle_FLT_Exception(exceptionInfo); 2640 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2641 } 2642 } 2643 2644 if (exception_code != EXCEPTION_BREAKPOINT) { 2645 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2646 exceptionInfo->ContextRecord); 2647 } 2648 return EXCEPTION_CONTINUE_SEARCH; 2649 } 2650 2651 #ifndef _WIN64 2652 // Special care for fast JNI accessors. 2653 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2654 // the heap gets shrunk before the field access. 2655 // Need to install our own structured exception handler since native code may 2656 // install its own. 2657 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2658 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2659 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2660 address pc = (address) exceptionInfo->ContextRecord->Eip; 2661 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2662 if (addr != (address)-1) { 2663 return Handle_Exception(exceptionInfo, addr); 2664 } 2665 } 2666 return EXCEPTION_CONTINUE_SEARCH; 2667 } 2668 2669 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \ 2670 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \ 2671 __try { \ 2672 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \ 2673 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \ 2674 } \ 2675 return 0; \ 2676 } 2677 2678 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2679 DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2680 DEFINE_FAST_GETFIELD(jchar, char, Char) 2681 DEFINE_FAST_GETFIELD(jshort, short, Short) 2682 DEFINE_FAST_GETFIELD(jint, int, Int) 2683 DEFINE_FAST_GETFIELD(jlong, long, Long) 2684 DEFINE_FAST_GETFIELD(jfloat, float, Float) 2685 DEFINE_FAST_GETFIELD(jdouble, double, Double) 2686 2687 address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2688 switch (type) { 2689 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2690 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2691 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2692 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2693 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2694 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2695 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2696 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2697 default: ShouldNotReachHere(); 2698 } 2699 return (address)-1; 2700 } 2701 #endif 2702 2703 #ifndef PRODUCT 2704 void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) { 2705 // Install a win32 structured exception handler around the test 2706 // function call so the VM can generate an error dump if needed. 2707 __try { 2708 (*funcPtr)(); 2709 } __except(topLevelExceptionFilter( 2710 (_EXCEPTION_POINTERS*)_exception_info())) { 2711 // Nothing to do. 2712 } 2713 } 2714 #endif 2715 2716 // Virtual Memory 2717 2718 int os::vm_page_size() { return os::win32::vm_page_size(); } 2719 int os::vm_allocation_granularity() { 2720 return os::win32::vm_allocation_granularity(); 2721 } 2722 2723 // Windows large page support is available on Windows 2003. In order to use 2724 // large page memory, the administrator must first assign additional privilege 2725 // to the user: 2726 // + select Control Panel -> Administrative Tools -> Local Security Policy 2727 // + select Local Policies -> User Rights Assignment 2728 // + double click "Lock pages in memory", add users and/or groups 2729 // + reboot 2730 // Note the above steps are needed for administrator as well, as administrators 2731 // by default do not have the privilege to lock pages in memory. 2732 // 2733 // Note about Windows 2003: although the API supports committing large page 2734 // memory on a page-by-page basis and VirtualAlloc() returns success under this 2735 // scenario, I found through experiment it only uses large page if the entire 2736 // memory region is reserved and committed in a single VirtualAlloc() call. 2737 // This makes Windows large page support more or less like Solaris ISM, in 2738 // that the entire heap must be committed upfront. This probably will change 2739 // in the future, if so the code below needs to be revisited. 2740 2741 #ifndef MEM_LARGE_PAGES 2742 #define MEM_LARGE_PAGES 0x20000000 2743 #endif 2744 2745 static HANDLE _hProcess; 2746 static HANDLE _hToken; 2747 2748 // Container for NUMA node list info 2749 class NUMANodeListHolder { 2750 private: 2751 int *_numa_used_node_list; // allocated below 2752 int _numa_used_node_count; 2753 2754 void free_node_list() { 2755 if (_numa_used_node_list != NULL) { 2756 FREE_C_HEAP_ARRAY(int, _numa_used_node_list, mtInternal); 2757 } 2758 } 2759 2760 public: 2761 NUMANodeListHolder() { 2762 _numa_used_node_count = 0; 2763 _numa_used_node_list = NULL; 2764 // do rest of initialization in build routine (after function pointers are set up) 2765 } 2766 2767 ~NUMANodeListHolder() { 2768 free_node_list(); 2769 } 2770 2771 bool build() { 2772 DWORD_PTR proc_aff_mask; 2773 DWORD_PTR sys_aff_mask; 2774 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false; 2775 ULONG highest_node_number; 2776 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false; 2777 free_node_list(); 2778 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal); 2779 for (unsigned int i = 0; i <= highest_node_number; i++) { 2780 ULONGLONG proc_mask_numa_node; 2781 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false; 2782 if ((proc_aff_mask & proc_mask_numa_node)!=0) { 2783 _numa_used_node_list[_numa_used_node_count++] = i; 2784 } 2785 } 2786 return (_numa_used_node_count > 1); 2787 } 2788 2789 int get_count() {return _numa_used_node_count;} 2790 int get_node_list_entry(int n) { 2791 // for indexes out of range, returns -1 2792 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1); 2793 } 2794 2795 } numa_node_list_holder; 2796 2797 2798 2799 static size_t _large_page_size = 0; 2800 2801 static bool resolve_functions_for_large_page_init() { 2802 return os::Kernel32Dll::GetLargePageMinimumAvailable() && 2803 os::Advapi32Dll::AdvapiAvailable(); 2804 } 2805 2806 static bool request_lock_memory_privilege() { 2807 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2808 os::current_process_id()); 2809 2810 LUID luid; 2811 if (_hProcess != NULL && 2812 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2813 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2814 2815 TOKEN_PRIVILEGES tp; 2816 tp.PrivilegeCount = 1; 2817 tp.Privileges[0].Luid = luid; 2818 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2819 2820 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2821 // privilege. Check GetLastError() too. See MSDN document. 2822 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2823 (GetLastError() == ERROR_SUCCESS)) { 2824 return true; 2825 } 2826 } 2827 2828 return false; 2829 } 2830 2831 static void cleanup_after_large_page_init() { 2832 if (_hProcess) CloseHandle(_hProcess); 2833 _hProcess = NULL; 2834 if (_hToken) CloseHandle(_hToken); 2835 _hToken = NULL; 2836 } 2837 2838 static bool numa_interleaving_init() { 2839 bool success = false; 2840 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving); 2841 2842 // print a warning if UseNUMAInterleaving flag is specified on command line 2843 bool warn_on_failure = use_numa_interleaving_specified; 2844 # define WARN(msg) if (warn_on_failure) { warning(msg); } 2845 2846 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages) 2847 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2848 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity); 2849 2850 if (os::Kernel32Dll::NumaCallsAvailable()) { 2851 if (numa_node_list_holder.build()) { 2852 if (PrintMiscellaneous && Verbose) { 2853 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count()); 2854 for (int i = 0; i < numa_node_list_holder.get_count(); i++) { 2855 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i)); 2856 } 2857 tty->print("\n"); 2858 } 2859 success = true; 2860 } else { 2861 WARN("Process does not cover multiple NUMA nodes."); 2862 } 2863 } else { 2864 WARN("NUMA Interleaving is not supported by the operating system."); 2865 } 2866 if (!success) { 2867 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag."); 2868 } 2869 return success; 2870 #undef WARN 2871 } 2872 2873 // this routine is used whenever we need to reserve a contiguous VA range 2874 // but we need to make separate VirtualAlloc calls for each piece of the range 2875 // Reasons for doing this: 2876 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise) 2877 // * UseNUMAInterleaving requires a separate node for each piece 2878 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, DWORD prot, 2879 bool should_inject_error=false) { 2880 char * p_buf; 2881 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size 2882 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2883 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size; 2884 2885 // first reserve enough address space in advance since we want to be 2886 // able to break a single contiguous virtual address range into multiple 2887 // large page commits but WS2003 does not allow reserving large page space 2888 // so we just use 4K pages for reserve, this gives us a legal contiguous 2889 // address space. then we will deallocate that reservation, and re alloc 2890 // using large pages 2891 const size_t size_of_reserve = bytes + chunk_size; 2892 if (bytes > size_of_reserve) { 2893 // Overflowed. 2894 return NULL; 2895 } 2896 p_buf = (char *) VirtualAlloc(addr, 2897 size_of_reserve, // size of Reserve 2898 MEM_RESERVE, 2899 PAGE_READWRITE); 2900 // If reservation failed, return NULL 2901 if (p_buf == NULL) return NULL; 2902 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, mtNone, CALLER_PC); 2903 os::release_memory(p_buf, bytes + chunk_size); 2904 2905 // we still need to round up to a page boundary (in case we are using large pages) 2906 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size) 2907 // instead we handle this in the bytes_to_rq computation below 2908 p_buf = (char *) align_size_up((size_t)p_buf, page_size); 2909 2910 // now go through and allocate one chunk at a time until all bytes are 2911 // allocated 2912 size_t bytes_remaining = bytes; 2913 // An overflow of align_size_up() would have been caught above 2914 // in the calculation of size_of_reserve. 2915 char * next_alloc_addr = p_buf; 2916 HANDLE hProc = GetCurrentProcess(); 2917 2918 #ifdef ASSERT 2919 // Variable for the failure injection 2920 long ran_num = os::random(); 2921 size_t fail_after = ran_num % bytes; 2922 #endif 2923 2924 int count=0; 2925 while (bytes_remaining) { 2926 // select bytes_to_rq to get to the next chunk_size boundary 2927 2928 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size)); 2929 // Note allocate and commit 2930 char * p_new; 2931 2932 #ifdef ASSERT 2933 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after); 2934 #else 2935 const bool inject_error_now = false; 2936 #endif 2937 2938 if (inject_error_now) { 2939 p_new = NULL; 2940 } else { 2941 if (!UseNUMAInterleaving) { 2942 p_new = (char *) VirtualAlloc(next_alloc_addr, 2943 bytes_to_rq, 2944 flags, 2945 prot); 2946 } else { 2947 // get the next node to use from the used_node_list 2948 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected"); 2949 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count()); 2950 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc, 2951 next_alloc_addr, 2952 bytes_to_rq, 2953 flags, 2954 prot, 2955 node); 2956 } 2957 } 2958 2959 if (p_new == NULL) { 2960 // Free any allocated pages 2961 if (next_alloc_addr > p_buf) { 2962 // Some memory was committed so release it. 2963 size_t bytes_to_release = bytes - bytes_remaining; 2964 // NMT has yet to record any individual blocks, so it 2965 // need to create a dummy 'reserve' record to match 2966 // the release. 2967 MemTracker::record_virtual_memory_reserve((address)p_buf, 2968 bytes_to_release, mtNone, CALLER_PC); 2969 os::release_memory(p_buf, bytes_to_release); 2970 } 2971 #ifdef ASSERT 2972 if (should_inject_error) { 2973 if (TracePageSizes && Verbose) { 2974 tty->print_cr("Reserving pages individually failed."); 2975 } 2976 } 2977 #endif 2978 return NULL; 2979 } 2980 2981 bytes_remaining -= bytes_to_rq; 2982 next_alloc_addr += bytes_to_rq; 2983 count++; 2984 } 2985 // Although the memory is allocated individually, it is returned as one. 2986 // NMT records it as one block. 2987 address pc = CALLER_PC; 2988 if ((flags & MEM_COMMIT) != 0) { 2989 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, mtNone, pc); 2990 } else { 2991 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, mtNone, pc); 2992 } 2993 2994 // made it this far, success 2995 return p_buf; 2996 } 2997 2998 2999 3000 void os::large_page_init() { 3001 if (!UseLargePages) return; 3002 3003 // print a warning if any large page related flag is specified on command line 3004 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 3005 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 3006 bool success = false; 3007 3008 # define WARN(msg) if (warn_on_failure) { warning(msg); } 3009 if (resolve_functions_for_large_page_init()) { 3010 if (request_lock_memory_privilege()) { 3011 size_t s = os::Kernel32Dll::GetLargePageMinimum(); 3012 if (s) { 3013 #if defined(IA32) || defined(AMD64) 3014 if (s > 4*M || LargePageSizeInBytes > 4*M) { 3015 WARN("JVM cannot use large pages bigger than 4mb."); 3016 } else { 3017 #endif 3018 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 3019 _large_page_size = LargePageSizeInBytes; 3020 } else { 3021 _large_page_size = s; 3022 } 3023 success = true; 3024 #if defined(IA32) || defined(AMD64) 3025 } 3026 #endif 3027 } else { 3028 WARN("Large page is not supported by the processor."); 3029 } 3030 } else { 3031 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 3032 } 3033 } else { 3034 WARN("Large page is not supported by the operating system."); 3035 } 3036 #undef WARN 3037 3038 const size_t default_page_size = (size_t) vm_page_size(); 3039 if (success && _large_page_size > default_page_size) { 3040 _page_sizes[0] = _large_page_size; 3041 _page_sizes[1] = default_page_size; 3042 _page_sizes[2] = 0; 3043 } 3044 3045 cleanup_after_large_page_init(); 3046 UseLargePages = success; 3047 } 3048 3049 // On win32, one cannot release just a part of reserved memory, it's an 3050 // all or nothing deal. When we split a reservation, we must break the 3051 // reservation into two reservations. 3052 void os::pd_split_reserved_memory(char *base, size_t size, size_t split, 3053 bool realloc) { 3054 if (size > 0) { 3055 release_memory(base, size); 3056 if (realloc) { 3057 reserve_memory(split, base); 3058 } 3059 if (size != split) { 3060 reserve_memory(size - split, base + split); 3061 } 3062 } 3063 } 3064 3065 // Multiple threads can race in this code but it's not possible to unmap small sections of 3066 // virtual space to get requested alignment, like posix-like os's. 3067 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe. 3068 char* os::reserve_memory_aligned(size_t size, size_t alignment) { 3069 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 3070 "Alignment must be a multiple of allocation granularity (page size)"); 3071 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 3072 3073 size_t extra_size = size + alignment; 3074 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 3075 3076 char* aligned_base = NULL; 3077 3078 do { 3079 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 3080 if (extra_base == NULL) { 3081 return NULL; 3082 } 3083 // Do manual alignment 3084 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 3085 3086 os::release_memory(extra_base, extra_size); 3087 3088 aligned_base = os::reserve_memory(size, aligned_base); 3089 3090 } while (aligned_base == NULL); 3091 3092 return aligned_base; 3093 } 3094 3095 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 3096 assert((size_t)addr % os::vm_allocation_granularity() == 0, 3097 "reserve alignment"); 3098 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size"); 3099 char* res; 3100 // note that if UseLargePages is on, all the areas that require interleaving 3101 // will go thru reserve_memory_special rather than thru here. 3102 bool use_individual = (UseNUMAInterleaving && !UseLargePages); 3103 if (!use_individual) { 3104 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 3105 } else { 3106 elapsedTimer reserveTimer; 3107 if( Verbose && PrintMiscellaneous ) reserveTimer.start(); 3108 // in numa interleaving, we have to allocate pages individually 3109 // (well really chunks of NUMAInterleaveGranularity size) 3110 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE); 3111 if (res == NULL) { 3112 warning("NUMA page allocation failed"); 3113 } 3114 if( Verbose && PrintMiscellaneous ) { 3115 reserveTimer.stop(); 3116 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes, 3117 reserveTimer.milliseconds(), reserveTimer.ticks()); 3118 } 3119 } 3120 assert(res == NULL || addr == NULL || addr == res, 3121 "Unexpected address from reserve."); 3122 3123 return res; 3124 } 3125 3126 // Reserve memory at an arbitrary address, only if that area is 3127 // available (and not reserved for something else). 3128 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3129 // Windows os::reserve_memory() fails of the requested address range is 3130 // not avilable. 3131 return reserve_memory(bytes, requested_addr); 3132 } 3133 3134 size_t os::large_page_size() { 3135 return _large_page_size; 3136 } 3137 3138 bool os::can_commit_large_page_memory() { 3139 // Windows only uses large page memory when the entire region is reserved 3140 // and committed in a single VirtualAlloc() call. This may change in the 3141 // future, but with Windows 2003 it's not possible to commit on demand. 3142 return false; 3143 } 3144 3145 bool os::can_execute_large_page_memory() { 3146 return true; 3147 } 3148 3149 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, bool exec) { 3150 assert(UseLargePages, "only for large pages"); 3151 3152 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { 3153 return NULL; // Fallback to small pages. 3154 } 3155 3156 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 3157 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3158 3159 // with large pages, there are two cases where we need to use Individual Allocation 3160 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003) 3161 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page 3162 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) { 3163 if (TracePageSizes && Verbose) { 3164 tty->print_cr("Reserving large pages individually."); 3165 } 3166 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError); 3167 if (p_buf == NULL) { 3168 // give an appropriate warning message 3169 if (UseNUMAInterleaving) { 3170 warning("NUMA large page allocation failed, UseLargePages flag ignored"); 3171 } 3172 if (UseLargePagesIndividualAllocation) { 3173 warning("Individually allocated large pages failed, " 3174 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 3175 } 3176 return NULL; 3177 } 3178 3179 return p_buf; 3180 3181 } else { 3182 if (TracePageSizes && Verbose) { 3183 tty->print_cr("Reserving large pages in a single large chunk."); 3184 } 3185 // normal policy just allocate it all at once 3186 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3187 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); 3188 if (res != NULL) { 3189 address pc = CALLER_PC; 3190 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, mtNone, pc); 3191 } 3192 3193 return res; 3194 } 3195 } 3196 3197 bool os::release_memory_special(char* base, size_t bytes) { 3198 assert(base != NULL, "Sanity check"); 3199 return release_memory(base, bytes); 3200 } 3201 3202 void os::print_statistics() { 3203 } 3204 3205 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) { 3206 int err = os::get_last_error(); 3207 char buf[256]; 3208 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3209 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 3210 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3211 exec, buf_len != 0 ? buf : "<no_error_string>", err); 3212 } 3213 3214 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 3215 if (bytes == 0) { 3216 // Don't bother the OS with noops. 3217 return true; 3218 } 3219 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 3220 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 3221 // Don't attempt to print anything if the OS call fails. We're 3222 // probably low on resources, so the print itself may cause crashes. 3223 3224 // unless we have NUMAInterleaving enabled, the range of a commit 3225 // is always within a reserve covered by a single VirtualAlloc 3226 // in that case we can just do a single commit for the requested size 3227 if (!UseNUMAInterleaving) { 3228 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) { 3229 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3230 return false; 3231 } 3232 if (exec) { 3233 DWORD oldprot; 3234 // Windows doc says to use VirtualProtect to get execute permissions 3235 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) { 3236 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3237 return false; 3238 } 3239 } 3240 return true; 3241 } else { 3242 3243 // when NUMAInterleaving is enabled, the commit might cover a range that 3244 // came from multiple VirtualAlloc reserves (using allocate_pages_individually). 3245 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery 3246 // returns represents the number of bytes that can be committed in one step. 3247 size_t bytes_remaining = bytes; 3248 char * next_alloc_addr = addr; 3249 while (bytes_remaining > 0) { 3250 MEMORY_BASIC_INFORMATION alloc_info; 3251 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info)); 3252 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3253 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, 3254 PAGE_READWRITE) == NULL) { 3255 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3256 exec);) 3257 return false; 3258 } 3259 if (exec) { 3260 DWORD oldprot; 3261 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, 3262 PAGE_EXECUTE_READWRITE, &oldprot)) { 3263 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3264 exec);) 3265 return false; 3266 } 3267 } 3268 bytes_remaining -= bytes_to_rq; 3269 next_alloc_addr += bytes_to_rq; 3270 } 3271 } 3272 // if we made it this far, return true 3273 return true; 3274 } 3275 3276 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 3277 bool exec) { 3278 // alignment_hint is ignored on this OS 3279 return pd_commit_memory(addr, size, exec); 3280 } 3281 3282 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 3283 const char* mesg) { 3284 assert(mesg != NULL, "mesg must be specified"); 3285 if (!pd_commit_memory(addr, size, exec)) { 3286 warn_fail_commit_memory(addr, size, exec); 3287 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); 3288 } 3289 } 3290 3291 void os::pd_commit_memory_or_exit(char* addr, size_t size, 3292 size_t alignment_hint, bool exec, 3293 const char* mesg) { 3294 // alignment_hint is ignored on this OS 3295 pd_commit_memory_or_exit(addr, size, exec, mesg); 3296 } 3297 3298 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3299 if (bytes == 0) { 3300 // Don't bother the OS with noops. 3301 return true; 3302 } 3303 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 3304 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 3305 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0); 3306 } 3307 3308 bool os::pd_release_memory(char* addr, size_t bytes) { 3309 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 3310 } 3311 3312 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 3313 return os::commit_memory(addr, size, !ExecMem); 3314 } 3315 3316 bool os::remove_stack_guard_pages(char* addr, size_t size) { 3317 return os::uncommit_memory(addr, size); 3318 } 3319 3320 // Set protections specified 3321 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3322 bool is_committed) { 3323 unsigned int p = 0; 3324 switch (prot) { 3325 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 3326 case MEM_PROT_READ: p = PAGE_READONLY; break; 3327 case MEM_PROT_RW: p = PAGE_READWRITE; break; 3328 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 3329 default: 3330 ShouldNotReachHere(); 3331 } 3332 3333 DWORD old_status; 3334 3335 // Strange enough, but on Win32 one can change protection only for committed 3336 // memory, not a big deal anyway, as bytes less or equal than 64K 3337 if (!is_committed) { 3338 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX, 3339 "cannot commit protection page"); 3340 } 3341 // One cannot use os::guard_memory() here, as on Win32 guard page 3342 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 3343 // 3344 // Pages in the region become guard pages. Any attempt to access a guard page 3345 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 3346 // the guard page status. Guard pages thus act as a one-time access alarm. 3347 return VirtualProtect(addr, bytes, p, &old_status) != 0; 3348 } 3349 3350 bool os::guard_memory(char* addr, size_t bytes) { 3351 DWORD old_status; 3352 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 3353 } 3354 3355 bool os::unguard_memory(char* addr, size_t bytes) { 3356 DWORD old_status; 3357 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 3358 } 3359 3360 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3361 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3362 void os::numa_make_global(char *addr, size_t bytes) { } 3363 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 3364 bool os::numa_topology_changed() { return false; } 3365 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); } 3366 int os::numa_get_group_id() { return 0; } 3367 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 3368 if (numa_node_list_holder.get_count() == 0 && size > 0) { 3369 // Provide an answer for UMA systems 3370 ids[0] = 0; 3371 return 1; 3372 } else { 3373 // check for size bigger than actual groups_num 3374 size = MIN2(size, numa_get_groups_num()); 3375 for (int i = 0; i < (int)size; i++) { 3376 ids[i] = numa_node_list_holder.get_node_list_entry(i); 3377 } 3378 return size; 3379 } 3380 } 3381 3382 bool os::get_page_info(char *start, page_info* info) { 3383 return false; 3384 } 3385 3386 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 3387 return end; 3388 } 3389 3390 char* os::non_memory_address_word() { 3391 // Must never look like an address returned by reserve_memory, 3392 // even in its subfields (as defined by the CPU immediate fields, 3393 // if the CPU splits constants across multiple instructions). 3394 return (char*)-1; 3395 } 3396 3397 #define MAX_ERROR_COUNT 100 3398 #define SYS_THREAD_ERROR 0xffffffffUL 3399 3400 void os::pd_start_thread(Thread* thread) { 3401 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 3402 // Returns previous suspend state: 3403 // 0: Thread was not suspended 3404 // 1: Thread is running now 3405 // >1: Thread is still suspended. 3406 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3407 } 3408 3409 class HighResolutionInterval : public CHeapObj<mtThread> { 3410 // The default timer resolution seems to be 10 milliseconds. 3411 // (Where is this written down?) 3412 // If someone wants to sleep for only a fraction of the default, 3413 // then we set the timer resolution down to 1 millisecond for 3414 // the duration of their interval. 3415 // We carefully set the resolution back, since otherwise we 3416 // seem to incur an overhead (3%?) that we don't need. 3417 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 3418 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 3419 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 3420 // timeBeginPeriod() if the relative error exceeded some threshold. 3421 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 3422 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 3423 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 3424 // resolution timers running. 3425 private: 3426 jlong resolution; 3427 public: 3428 HighResolutionInterval(jlong ms) { 3429 resolution = ms % 10L; 3430 if (resolution != 0) { 3431 MMRESULT result = timeBeginPeriod(1L); 3432 } 3433 } 3434 ~HighResolutionInterval() { 3435 if (resolution != 0) { 3436 MMRESULT result = timeEndPeriod(1L); 3437 } 3438 resolution = 0L; 3439 } 3440 }; 3441 3442 int os::sleep(Thread* thread, jlong ms, bool interruptable) { 3443 jlong limit = (jlong) MAXDWORD; 3444 3445 while(ms > limit) { 3446 int res; 3447 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) 3448 return res; 3449 ms -= limit; 3450 } 3451 3452 assert(thread == Thread::current(), "thread consistency check"); 3453 OSThread* osthread = thread->osthread(); 3454 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 3455 int result; 3456 if (interruptable) { 3457 assert(thread->is_Java_thread(), "must be java thread"); 3458 JavaThread *jt = (JavaThread *) thread; 3459 ThreadBlockInVM tbivm(jt); 3460 3461 jt->set_suspend_equivalent(); 3462 // cleared by handle_special_suspend_equivalent_condition() or 3463 // java_suspend_self() via check_and_wait_while_suspended() 3464 3465 HANDLE events[1]; 3466 events[0] = osthread->interrupt_event(); 3467 HighResolutionInterval *phri=NULL; 3468 if(!ForceTimeHighResolution) 3469 phri = new HighResolutionInterval( ms ); 3470 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 3471 result = OS_TIMEOUT; 3472 } else { 3473 ResetEvent(osthread->interrupt_event()); 3474 osthread->set_interrupted(false); 3475 result = OS_INTRPT; 3476 } 3477 delete phri; //if it is NULL, harmless 3478 3479 // were we externally suspended while we were waiting? 3480 jt->check_and_wait_while_suspended(); 3481 } else { 3482 assert(!thread->is_Java_thread(), "must not be java thread"); 3483 Sleep((long) ms); 3484 result = OS_TIMEOUT; 3485 } 3486 return result; 3487 } 3488 3489 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3490 void os::infinite_sleep() { 3491 while (true) { // sleep forever ... 3492 Sleep(100000); // ... 100 seconds at a time 3493 } 3494 } 3495 3496 typedef BOOL (WINAPI * STTSignature)(void) ; 3497 3498 os::YieldResult os::NakedYield() { 3499 // Use either SwitchToThread() or Sleep(0) 3500 // Consider passing back the return value from SwitchToThread(). 3501 if (os::Kernel32Dll::SwitchToThreadAvailable()) { 3502 return SwitchToThread() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ; 3503 } else { 3504 Sleep(0); 3505 } 3506 return os::YIELD_UNKNOWN ; 3507 } 3508 3509 void os::yield() { os::NakedYield(); } 3510 3511 void os::yield_all(int attempts) { 3512 // Yields to all threads, including threads with lower priorities 3513 Sleep(1); 3514 } 3515 3516 // Win32 only gives you access to seven real priorities at a time, 3517 // so we compress Java's ten down to seven. It would be better 3518 // if we dynamically adjusted relative priorities. 3519 3520 int os::java_to_os_priority[CriticalPriority + 1] = { 3521 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3522 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3523 THREAD_PRIORITY_LOWEST, // 2 3524 THREAD_PRIORITY_BELOW_NORMAL, // 3 3525 THREAD_PRIORITY_BELOW_NORMAL, // 4 3526 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3527 THREAD_PRIORITY_NORMAL, // 6 3528 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3529 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3530 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3531 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority 3532 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority 3533 }; 3534 3535 int prio_policy1[CriticalPriority + 1] = { 3536 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3537 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3538 THREAD_PRIORITY_LOWEST, // 2 3539 THREAD_PRIORITY_BELOW_NORMAL, // 3 3540 THREAD_PRIORITY_BELOW_NORMAL, // 4 3541 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3542 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3543 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3544 THREAD_PRIORITY_HIGHEST, // 8 3545 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3546 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority 3547 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority 3548 }; 3549 3550 static int prio_init() { 3551 // If ThreadPriorityPolicy is 1, switch tables 3552 if (ThreadPriorityPolicy == 1) { 3553 int i; 3554 for (i = 0; i < CriticalPriority + 1; i++) { 3555 os::java_to_os_priority[i] = prio_policy1[i]; 3556 } 3557 } 3558 if (UseCriticalJavaThreadPriority) { 3559 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority] ; 3560 } 3561 return 0; 3562 } 3563 3564 OSReturn os::set_native_priority(Thread* thread, int priority) { 3565 if (!UseThreadPriorities) return OS_OK; 3566 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3567 return ret ? OS_OK : OS_ERR; 3568 } 3569 3570 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) { 3571 if ( !UseThreadPriorities ) { 3572 *priority_ptr = java_to_os_priority[NormPriority]; 3573 return OS_OK; 3574 } 3575 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3576 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3577 assert(false, "GetThreadPriority failed"); 3578 return OS_ERR; 3579 } 3580 *priority_ptr = os_prio; 3581 return OS_OK; 3582 } 3583 3584 3585 // Hint to the underlying OS that a task switch would not be good. 3586 // Void return because it's a hint and can fail. 3587 void os::hint_no_preempt() {} 3588 3589 void os::interrupt(Thread* thread) { 3590 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3591 "possibility of dangling Thread pointer"); 3592 3593 OSThread* osthread = thread->osthread(); 3594 osthread->set_interrupted(true); 3595 // More than one thread can get here with the same value of osthread, 3596 // resulting in multiple notifications. We do, however, want the store 3597 // to interrupted() to be visible to other threads before we post 3598 // the interrupt event. 3599 OrderAccess::release(); 3600 SetEvent(osthread->interrupt_event()); 3601 // For JSR166: unpark after setting status 3602 if (thread->is_Java_thread()) 3603 ((JavaThread*)thread)->parker()->unpark(); 3604 3605 ParkEvent * ev = thread->_ParkEvent ; 3606 if (ev != NULL) ev->unpark() ; 3607 3608 } 3609 3610 3611 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3612 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3613 "possibility of dangling Thread pointer"); 3614 3615 OSThread* osthread = thread->osthread(); 3616 bool interrupted = osthread->interrupted(); 3617 // There is no synchronization between the setting of the interrupt 3618 // and it being cleared here. It is critical - see 6535709 - that 3619 // we only clear the interrupt state, and reset the interrupt event, 3620 // if we are going to report that we were indeed interrupted - else 3621 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups 3622 // depending on the timing 3623 if (interrupted && clear_interrupted) { 3624 osthread->set_interrupted(false); 3625 ResetEvent(osthread->interrupt_event()); 3626 } // Otherwise leave the interrupted state alone 3627 3628 return interrupted; 3629 } 3630 3631 // Get's a pc (hint) for a running thread. Currently used only for profiling. 3632 ExtendedPC os::get_thread_pc(Thread* thread) { 3633 CONTEXT context; 3634 context.ContextFlags = CONTEXT_CONTROL; 3635 HANDLE handle = thread->osthread()->thread_handle(); 3636 #ifdef _M_IA64 3637 assert(0, "Fix get_thread_pc"); 3638 return ExtendedPC(NULL); 3639 #else 3640 if (GetThreadContext(handle, &context)) { 3641 #ifdef _M_AMD64 3642 return ExtendedPC((address) context.Rip); 3643 #else 3644 return ExtendedPC((address) context.Eip); 3645 #endif 3646 } else { 3647 return ExtendedPC(NULL); 3648 } 3649 #endif 3650 } 3651 3652 // GetCurrentThreadId() returns DWORD 3653 intx os::current_thread_id() { return GetCurrentThreadId(); } 3654 3655 static int _initial_pid = 0; 3656 3657 int os::current_process_id() 3658 { 3659 return (_initial_pid ? _initial_pid : _getpid()); 3660 } 3661 3662 int os::win32::_vm_page_size = 0; 3663 int os::win32::_vm_allocation_granularity = 0; 3664 int os::win32::_processor_type = 0; 3665 // Processor level is not available on non-NT systems, use vm_version instead 3666 int os::win32::_processor_level = 0; 3667 julong os::win32::_physical_memory = 0; 3668 size_t os::win32::_default_stack_size = 0; 3669 3670 intx os::win32::_os_thread_limit = 0; 3671 volatile intx os::win32::_os_thread_count = 0; 3672 3673 bool os::win32::_is_nt = false; 3674 bool os::win32::_is_windows_2003 = false; 3675 bool os::win32::_is_windows_server = false; 3676 3677 void os::win32::initialize_system_info() { 3678 SYSTEM_INFO si; 3679 GetSystemInfo(&si); 3680 _vm_page_size = si.dwPageSize; 3681 _vm_allocation_granularity = si.dwAllocationGranularity; 3682 _processor_type = si.dwProcessorType; 3683 _processor_level = si.wProcessorLevel; 3684 set_processor_count(si.dwNumberOfProcessors); 3685 3686 MEMORYSTATUSEX ms; 3687 ms.dwLength = sizeof(ms); 3688 3689 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3690 // dwMemoryLoad (% of memory in use) 3691 GlobalMemoryStatusEx(&ms); 3692 _physical_memory = ms.ullTotalPhys; 3693 3694 OSVERSIONINFOEX oi; 3695 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 3696 GetVersionEx((OSVERSIONINFO*)&oi); 3697 switch(oi.dwPlatformId) { 3698 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 3699 case VER_PLATFORM_WIN32_NT: 3700 _is_nt = true; 3701 { 3702 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3703 if (os_vers == 5002) { 3704 _is_windows_2003 = true; 3705 } 3706 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER || 3707 oi.wProductType == VER_NT_SERVER) { 3708 _is_windows_server = true; 3709 } 3710 } 3711 break; 3712 default: fatal("Unknown platform"); 3713 } 3714 3715 _default_stack_size = os::current_stack_size(); 3716 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3717 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3718 "stack size not a multiple of page size"); 3719 3720 initialize_performance_counter(); 3721 3722 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is 3723 // known to deadlock the system, if the VM issues to thread operations with 3724 // a too high frequency, e.g., such as changing the priorities. 3725 // The 6000 seems to work well - no deadlocks has been notices on the test 3726 // programs that we have seen experience this problem. 3727 if (!os::win32::is_nt()) { 3728 StarvationMonitorInterval = 6000; 3729 } 3730 } 3731 3732 3733 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) { 3734 char path[MAX_PATH]; 3735 DWORD size; 3736 DWORD pathLen = (DWORD)sizeof(path); 3737 HINSTANCE result = NULL; 3738 3739 // only allow library name without path component 3740 assert(strchr(name, '\\') == NULL, "path not allowed"); 3741 assert(strchr(name, ':') == NULL, "path not allowed"); 3742 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) { 3743 jio_snprintf(ebuf, ebuflen, 3744 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name); 3745 return NULL; 3746 } 3747 3748 // search system directory 3749 if ((size = GetSystemDirectory(path, pathLen)) > 0) { 3750 strcat(path, "\\"); 3751 strcat(path, name); 3752 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3753 return result; 3754 } 3755 } 3756 3757 // try Windows directory 3758 if ((size = GetWindowsDirectory(path, pathLen)) > 0) { 3759 strcat(path, "\\"); 3760 strcat(path, name); 3761 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3762 return result; 3763 } 3764 } 3765 3766 jio_snprintf(ebuf, ebuflen, 3767 "os::win32::load_windows_dll() cannot load %s from system directories.", name); 3768 return NULL; 3769 } 3770 3771 void os::win32::setmode_streams() { 3772 _setmode(_fileno(stdin), _O_BINARY); 3773 _setmode(_fileno(stdout), _O_BINARY); 3774 _setmode(_fileno(stderr), _O_BINARY); 3775 } 3776 3777 3778 bool os::is_debugger_attached() { 3779 return IsDebuggerPresent() ? true : false; 3780 } 3781 3782 3783 void os::wait_for_keypress_at_exit(void) { 3784 if (PauseAtExit) { 3785 fprintf(stderr, "Press any key to continue...\n"); 3786 fgetc(stdin); 3787 } 3788 } 3789 3790 3791 int os::message_box(const char* title, const char* message) { 3792 int result = MessageBox(NULL, message, title, 3793 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 3794 return result == IDYES; 3795 } 3796 3797 int os::allocate_thread_local_storage() { 3798 return TlsAlloc(); 3799 } 3800 3801 3802 void os::free_thread_local_storage(int index) { 3803 TlsFree(index); 3804 } 3805 3806 3807 void os::thread_local_storage_at_put(int index, void* value) { 3808 TlsSetValue(index, value); 3809 assert(thread_local_storage_at(index) == value, "Just checking"); 3810 } 3811 3812 3813 void* os::thread_local_storage_at(int index) { 3814 return TlsGetValue(index); 3815 } 3816 3817 3818 #ifndef PRODUCT 3819 #ifndef _WIN64 3820 // Helpers to check whether NX protection is enabled 3821 int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 3822 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 3823 pex->ExceptionRecord->NumberParameters > 0 && 3824 pex->ExceptionRecord->ExceptionInformation[0] == 3825 EXCEPTION_INFO_EXEC_VIOLATION) { 3826 return EXCEPTION_EXECUTE_HANDLER; 3827 } 3828 return EXCEPTION_CONTINUE_SEARCH; 3829 } 3830 3831 void nx_check_protection() { 3832 // If NX is enabled we'll get an exception calling into code on the stack 3833 char code[] = { (char)0xC3 }; // ret 3834 void *code_ptr = (void *)code; 3835 __try { 3836 __asm call code_ptr 3837 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 3838 tty->print_raw_cr("NX protection detected."); 3839 } 3840 } 3841 #endif // _WIN64 3842 #endif // PRODUCT 3843 3844 // this is called _before_ the global arguments have been parsed 3845 void os::init(void) { 3846 _initial_pid = _getpid(); 3847 3848 init_random(1234567); 3849 3850 win32::initialize_system_info(); 3851 win32::setmode_streams(); 3852 init_page_sizes((size_t) win32::vm_page_size()); 3853 3854 // For better scalability on MP systems (must be called after initialize_system_info) 3855 #ifndef PRODUCT 3856 if (is_MP()) { 3857 NoYieldsInMicrolock = true; 3858 } 3859 #endif 3860 // This may be overridden later when argument processing is done. 3861 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, 3862 os::win32::is_windows_2003()); 3863 3864 // Initialize main_process and main_thread 3865 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 3866 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 3867 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 3868 fatal("DuplicateHandle failed\n"); 3869 } 3870 main_thread_id = (int) GetCurrentThreadId(); 3871 } 3872 3873 // To install functions for atexit processing 3874 extern "C" { 3875 static void perfMemory_exit_helper() { 3876 perfMemory_exit(); 3877 } 3878 } 3879 3880 static jint initSock(); 3881 3882 // this is called _after_ the global arguments have been parsed 3883 jint os::init_2(void) { 3884 // Allocate a single page and mark it as readable for safepoint polling 3885 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 3886 guarantee( polling_page != NULL, "Reserve Failed for polling page"); 3887 3888 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 3889 guarantee( return_page != NULL, "Commit Failed for polling page"); 3890 3891 os::set_polling_page( polling_page ); 3892 3893 #ifndef PRODUCT 3894 if( Verbose && PrintMiscellaneous ) 3895 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 3896 #endif 3897 3898 if (!UseMembar) { 3899 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE); 3900 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 3901 3902 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE); 3903 guarantee( return_page != NULL, "Commit Failed for memory serialize page"); 3904 3905 os::set_memory_serialize_page( mem_serialize_page ); 3906 3907 #ifndef PRODUCT 3908 if(Verbose && PrintMiscellaneous) 3909 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3910 #endif 3911 } 3912 3913 // Setup Windows Exceptions 3914 3915 // for debugging float code generation bugs 3916 if (ForceFloatExceptions) { 3917 #ifndef _WIN64 3918 static long fp_control_word = 0; 3919 __asm { fstcw fp_control_word } 3920 // see Intel PPro Manual, Vol. 2, p 7-16 3921 const long precision = 0x20; 3922 const long underflow = 0x10; 3923 const long overflow = 0x08; 3924 const long zero_div = 0x04; 3925 const long denorm = 0x02; 3926 const long invalid = 0x01; 3927 fp_control_word |= invalid; 3928 __asm { fldcw fp_control_word } 3929 #endif 3930 } 3931 3932 // If stack_commit_size is 0, windows will reserve the default size, 3933 // but only commit a small portion of it. 3934 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 3935 size_t default_reserve_size = os::win32::default_stack_size(); 3936 size_t actual_reserve_size = stack_commit_size; 3937 if (stack_commit_size < default_reserve_size) { 3938 // If stack_commit_size == 0, we want this too 3939 actual_reserve_size = default_reserve_size; 3940 } 3941 3942 // Check minimum allowable stack size for thread creation and to initialize 3943 // the java system classes, including StackOverflowError - depends on page 3944 // size. Add a page for compiler2 recursion in main thread. 3945 // Add in 2*BytesPerWord times page size to account for VM stack during 3946 // class initialization depending on 32 or 64 bit VM. 3947 size_t min_stack_allowed = 3948 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 3949 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size(); 3950 if (actual_reserve_size < min_stack_allowed) { 3951 tty->print_cr("\nThe stack size specified is too small, " 3952 "Specify at least %dk", 3953 min_stack_allowed / K); 3954 return JNI_ERR; 3955 } 3956 3957 JavaThread::set_stack_size_at_create(stack_commit_size); 3958 3959 // Calculate theoretical max. size of Threads to guard gainst artifical 3960 // out-of-memory situations, where all available address-space has been 3961 // reserved by thread stacks. 3962 assert(actual_reserve_size != 0, "Must have a stack"); 3963 3964 // Calculate the thread limit when we should start doing Virtual Memory 3965 // banging. Currently when the threads will have used all but 200Mb of space. 3966 // 3967 // TODO: consider performing a similar calculation for commit size instead 3968 // as reserve size, since on a 64-bit platform we'll run into that more 3969 // often than running out of virtual memory space. We can use the 3970 // lower value of the two calculations as the os_thread_limit. 3971 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 3972 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 3973 3974 // at exit methods are called in the reverse order of their registration. 3975 // there is no limit to the number of functions registered. atexit does 3976 // not set errno. 3977 3978 if (PerfAllowAtExitRegistration) { 3979 // only register atexit functions if PerfAllowAtExitRegistration is set. 3980 // atexit functions can be delayed until process exit time, which 3981 // can be problematic for embedded VM situations. Embedded VMs should 3982 // call DestroyJavaVM() to assure that VM resources are released. 3983 3984 // note: perfMemory_exit_helper atexit function may be removed in 3985 // the future if the appropriate cleanup code can be added to the 3986 // VM_Exit VMOperation's doit method. 3987 if (atexit(perfMemory_exit_helper) != 0) { 3988 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3989 } 3990 } 3991 3992 #ifndef _WIN64 3993 // Print something if NX is enabled (win32 on AMD64) 3994 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 3995 #endif 3996 3997 // initialize thread priority policy 3998 prio_init(); 3999 4000 if (UseNUMA && !ForceNUMA) { 4001 UseNUMA = false; // We don't fully support this yet 4002 } 4003 4004 if (UseNUMAInterleaving) { 4005 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag 4006 bool success = numa_interleaving_init(); 4007 if (!success) UseNUMAInterleaving = false; 4008 } 4009 4010 if (initSock() != JNI_OK) { 4011 return JNI_ERR; 4012 } 4013 4014 return JNI_OK; 4015 } 4016 4017 void os::init_3(void) { 4018 return; 4019 } 4020 4021 // Mark the polling page as unreadable 4022 void os::make_polling_page_unreadable(void) { 4023 DWORD old_status; 4024 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) ) 4025 fatal("Could not disable polling page"); 4026 }; 4027 4028 // Mark the polling page as readable 4029 void os::make_polling_page_readable(void) { 4030 DWORD old_status; 4031 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) ) 4032 fatal("Could not enable polling page"); 4033 }; 4034 4035 4036 int os::stat(const char *path, struct stat *sbuf) { 4037 char pathbuf[MAX_PATH]; 4038 if (strlen(path) > MAX_PATH - 1) { 4039 errno = ENAMETOOLONG; 4040 return -1; 4041 } 4042 os::native_path(strcpy(pathbuf, path)); 4043 int ret = ::stat(pathbuf, sbuf); 4044 if (sbuf != NULL && UseUTCFileTimestamp) { 4045 // Fix for 6539723. st_mtime returned from stat() is dependent on 4046 // the system timezone and so can return different values for the 4047 // same file if/when daylight savings time changes. This adjustment 4048 // makes sure the same timestamp is returned regardless of the TZ. 4049 // 4050 // See: 4051 // http://msdn.microsoft.com/library/ 4052 // default.asp?url=/library/en-us/sysinfo/base/ 4053 // time_zone_information_str.asp 4054 // and 4055 // http://msdn.microsoft.com/library/default.asp?url= 4056 // /library/en-us/sysinfo/base/settimezoneinformation.asp 4057 // 4058 // NOTE: there is a insidious bug here: If the timezone is changed 4059 // after the call to stat() but before 'GetTimeZoneInformation()', then 4060 // the adjustment we do here will be wrong and we'll return the wrong 4061 // value (which will likely end up creating an invalid class data 4062 // archive). Absent a better API for this, or some time zone locking 4063 // mechanism, we'll have to live with this risk. 4064 TIME_ZONE_INFORMATION tz; 4065 DWORD tzid = GetTimeZoneInformation(&tz); 4066 int daylightBias = 4067 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 4068 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 4069 } 4070 return ret; 4071 } 4072 4073 4074 #define FT2INT64(ft) \ 4075 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 4076 4077 4078 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4079 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4080 // of a thread. 4081 // 4082 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4083 // the fast estimate available on the platform. 4084 4085 // current_thread_cpu_time() is not optimized for Windows yet 4086 jlong os::current_thread_cpu_time() { 4087 // return user + sys since the cost is the same 4088 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 4089 } 4090 4091 jlong os::thread_cpu_time(Thread* thread) { 4092 // consistent with what current_thread_cpu_time() returns. 4093 return os::thread_cpu_time(thread, true /* user+sys */); 4094 } 4095 4096 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4097 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4098 } 4099 4100 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 4101 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 4102 // If this function changes, os::is_thread_cpu_time_supported() should too 4103 if (os::win32::is_nt()) { 4104 FILETIME CreationTime; 4105 FILETIME ExitTime; 4106 FILETIME KernelTime; 4107 FILETIME UserTime; 4108 4109 if ( GetThreadTimes(thread->osthread()->thread_handle(), 4110 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 4111 return -1; 4112 else 4113 if (user_sys_cpu_time) { 4114 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 4115 } else { 4116 return FT2INT64(UserTime) * 100; 4117 } 4118 } else { 4119 return (jlong) timeGetTime() * 1000000; 4120 } 4121 } 4122 4123 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4124 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4125 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4126 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4127 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4128 } 4129 4130 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4131 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4132 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4133 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4134 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4135 } 4136 4137 bool os::is_thread_cpu_time_supported() { 4138 // see os::thread_cpu_time 4139 if (os::win32::is_nt()) { 4140 FILETIME CreationTime; 4141 FILETIME ExitTime; 4142 FILETIME KernelTime; 4143 FILETIME UserTime; 4144 4145 if ( GetThreadTimes(GetCurrentThread(), 4146 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 4147 return false; 4148 else 4149 return true; 4150 } else { 4151 return false; 4152 } 4153 } 4154 4155 // Windows does't provide a loadavg primitive so this is stubbed out for now. 4156 // It does have primitives (PDH API) to get CPU usage and run queue length. 4157 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 4158 // If we wanted to implement loadavg on Windows, we have a few options: 4159 // 4160 // a) Query CPU usage and run queue length and "fake" an answer by 4161 // returning the CPU usage if it's under 100%, and the run queue 4162 // length otherwise. It turns out that querying is pretty slow 4163 // on Windows, on the order of 200 microseconds on a fast machine. 4164 // Note that on the Windows the CPU usage value is the % usage 4165 // since the last time the API was called (and the first call 4166 // returns 100%), so we'd have to deal with that as well. 4167 // 4168 // b) Sample the "fake" answer using a sampling thread and store 4169 // the answer in a global variable. The call to loadavg would 4170 // just return the value of the global, avoiding the slow query. 4171 // 4172 // c) Sample a better answer using exponential decay to smooth the 4173 // value. This is basically the algorithm used by UNIX kernels. 4174 // 4175 // Note that sampling thread starvation could affect both (b) and (c). 4176 int os::loadavg(double loadavg[], int nelem) { 4177 return -1; 4178 } 4179 4180 4181 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 4182 bool os::dont_yield() { 4183 return DontYieldALot; 4184 } 4185 4186 // This method is a slightly reworked copy of JDK's sysOpen 4187 // from src/windows/hpi/src/sys_api_md.c 4188 4189 int os::open(const char *path, int oflag, int mode) { 4190 char pathbuf[MAX_PATH]; 4191 4192 if (strlen(path) > MAX_PATH - 1) { 4193 errno = ENAMETOOLONG; 4194 return -1; 4195 } 4196 os::native_path(strcpy(pathbuf, path)); 4197 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 4198 } 4199 4200 FILE* os::open(int fd, const char* mode) { 4201 return ::_fdopen(fd, mode); 4202 } 4203 4204 // Is a (classpath) directory empty? 4205 bool os::dir_is_empty(const char* path) { 4206 WIN32_FIND_DATA fd; 4207 HANDLE f = FindFirstFile(path, &fd); 4208 if (f == INVALID_HANDLE_VALUE) { 4209 return true; 4210 } 4211 FindClose(f); 4212 return false; 4213 } 4214 4215 // create binary file, rewriting existing file if required 4216 int os::create_binary_file(const char* path, bool rewrite_existing) { 4217 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 4218 if (!rewrite_existing) { 4219 oflags |= _O_EXCL; 4220 } 4221 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 4222 } 4223 4224 // return current position of file pointer 4225 jlong os::current_file_offset(int fd) { 4226 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 4227 } 4228 4229 // move file pointer to the specified offset 4230 jlong os::seek_to_file_offset(int fd, jlong offset) { 4231 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 4232 } 4233 4234 4235 jlong os::lseek(int fd, jlong offset, int whence) { 4236 return (jlong) ::_lseeki64(fd, offset, whence); 4237 } 4238 4239 // This method is a slightly reworked copy of JDK's sysNativePath 4240 // from src/windows/hpi/src/path_md.c 4241 4242 /* Convert a pathname to native format. On win32, this involves forcing all 4243 separators to be '\\' rather than '/' (both are legal inputs, but Win95 4244 sometimes rejects '/') and removing redundant separators. The input path is 4245 assumed to have been converted into the character encoding used by the local 4246 system. Because this might be a double-byte encoding, care is taken to 4247 treat double-byte lead characters correctly. 4248 4249 This procedure modifies the given path in place, as the result is never 4250 longer than the original. There is no error return; this operation always 4251 succeeds. */ 4252 char * os::native_path(char *path) { 4253 char *src = path, *dst = path, *end = path; 4254 char *colon = NULL; /* If a drive specifier is found, this will 4255 point to the colon following the drive 4256 letter */ 4257 4258 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */ 4259 assert(((!::IsDBCSLeadByte('/')) 4260 && (!::IsDBCSLeadByte('\\')) 4261 && (!::IsDBCSLeadByte(':'))), 4262 "Illegal lead byte"); 4263 4264 /* Check for leading separators */ 4265 #define isfilesep(c) ((c) == '/' || (c) == '\\') 4266 while (isfilesep(*src)) { 4267 src++; 4268 } 4269 4270 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 4271 /* Remove leading separators if followed by drive specifier. This 4272 hack is necessary to support file URLs containing drive 4273 specifiers (e.g., "file://c:/path"). As a side effect, 4274 "/c:/path" can be used as an alternative to "c:/path". */ 4275 *dst++ = *src++; 4276 colon = dst; 4277 *dst++ = ':'; 4278 src++; 4279 } else { 4280 src = path; 4281 if (isfilesep(src[0]) && isfilesep(src[1])) { 4282 /* UNC pathname: Retain first separator; leave src pointed at 4283 second separator so that further separators will be collapsed 4284 into the second separator. The result will be a pathname 4285 beginning with "\\\\" followed (most likely) by a host name. */ 4286 src = dst = path + 1; 4287 path[0] = '\\'; /* Force first separator to '\\' */ 4288 } 4289 } 4290 4291 end = dst; 4292 4293 /* Remove redundant separators from remainder of path, forcing all 4294 separators to be '\\' rather than '/'. Also, single byte space 4295 characters are removed from the end of the path because those 4296 are not legal ending characters on this operating system. 4297 */ 4298 while (*src != '\0') { 4299 if (isfilesep(*src)) { 4300 *dst++ = '\\'; src++; 4301 while (isfilesep(*src)) src++; 4302 if (*src == '\0') { 4303 /* Check for trailing separator */ 4304 end = dst; 4305 if (colon == dst - 2) break; /* "z:\\" */ 4306 if (dst == path + 1) break; /* "\\" */ 4307 if (dst == path + 2 && isfilesep(path[0])) { 4308 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the 4309 beginning of a UNC pathname. Even though it is not, by 4310 itself, a valid UNC pathname, we leave it as is in order 4311 to be consistent with the path canonicalizer as well 4312 as the win32 APIs, which treat this case as an invalid 4313 UNC pathname rather than as an alias for the root 4314 directory of the current drive. */ 4315 break; 4316 } 4317 end = --dst; /* Path does not denote a root directory, so 4318 remove trailing separator */ 4319 break; 4320 } 4321 end = dst; 4322 } else { 4323 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */ 4324 *dst++ = *src++; 4325 if (*src) *dst++ = *src++; 4326 end = dst; 4327 } else { /* Copy a single-byte character */ 4328 char c = *src++; 4329 *dst++ = c; 4330 /* Space is not a legal ending character */ 4331 if (c != ' ') end = dst; 4332 } 4333 } 4334 } 4335 4336 *end = '\0'; 4337 4338 /* For "z:", add "." to work around a bug in the C runtime library */ 4339 if (colon == dst - 1) { 4340 path[2] = '.'; 4341 path[3] = '\0'; 4342 } 4343 4344 return path; 4345 } 4346 4347 // This code is a copy of JDK's sysSetLength 4348 // from src/windows/hpi/src/sys_api_md.c 4349 4350 int os::ftruncate(int fd, jlong length) { 4351 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4352 long high = (long)(length >> 32); 4353 DWORD ret; 4354 4355 if (h == (HANDLE)(-1)) { 4356 return -1; 4357 } 4358 4359 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 4360 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 4361 return -1; 4362 } 4363 4364 if (::SetEndOfFile(h) == FALSE) { 4365 return -1; 4366 } 4367 4368 return 0; 4369 } 4370 4371 4372 // This code is a copy of JDK's sysSync 4373 // from src/windows/hpi/src/sys_api_md.c 4374 // except for the legacy workaround for a bug in Win 98 4375 4376 int os::fsync(int fd) { 4377 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 4378 4379 if ( (!::FlushFileBuffers(handle)) && 4380 (GetLastError() != ERROR_ACCESS_DENIED) ) { 4381 /* from winerror.h */ 4382 return -1; 4383 } 4384 return 0; 4385 } 4386 4387 static int nonSeekAvailable(int, long *); 4388 static int stdinAvailable(int, long *); 4389 4390 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR) 4391 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO) 4392 4393 // This code is a copy of JDK's sysAvailable 4394 // from src/windows/hpi/src/sys_api_md.c 4395 4396 int os::available(int fd, jlong *bytes) { 4397 jlong cur, end; 4398 struct _stati64 stbuf64; 4399 4400 if (::_fstati64(fd, &stbuf64) >= 0) { 4401 int mode = stbuf64.st_mode; 4402 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 4403 int ret; 4404 long lpbytes; 4405 if (fd == 0) { 4406 ret = stdinAvailable(fd, &lpbytes); 4407 } else { 4408 ret = nonSeekAvailable(fd, &lpbytes); 4409 } 4410 (*bytes) = (jlong)(lpbytes); 4411 return ret; 4412 } 4413 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 4414 return FALSE; 4415 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 4416 return FALSE; 4417 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 4418 return FALSE; 4419 } 4420 *bytes = end - cur; 4421 return TRUE; 4422 } else { 4423 return FALSE; 4424 } 4425 } 4426 4427 // This code is a copy of JDK's nonSeekAvailable 4428 // from src/windows/hpi/src/sys_api_md.c 4429 4430 static int nonSeekAvailable(int fd, long *pbytes) { 4431 /* This is used for available on non-seekable devices 4432 * (like both named and anonymous pipes, such as pipes 4433 * connected to an exec'd process). 4434 * Standard Input is a special case. 4435 * 4436 */ 4437 HANDLE han; 4438 4439 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 4440 return FALSE; 4441 } 4442 4443 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 4444 /* PeekNamedPipe fails when at EOF. In that case we 4445 * simply make *pbytes = 0 which is consistent with the 4446 * behavior we get on Solaris when an fd is at EOF. 4447 * The only alternative is to raise an Exception, 4448 * which isn't really warranted. 4449 */ 4450 if (::GetLastError() != ERROR_BROKEN_PIPE) { 4451 return FALSE; 4452 } 4453 *pbytes = 0; 4454 } 4455 return TRUE; 4456 } 4457 4458 #define MAX_INPUT_EVENTS 2000 4459 4460 // This code is a copy of JDK's stdinAvailable 4461 // from src/windows/hpi/src/sys_api_md.c 4462 4463 static int stdinAvailable(int fd, long *pbytes) { 4464 HANDLE han; 4465 DWORD numEventsRead = 0; /* Number of events read from buffer */ 4466 DWORD numEvents = 0; /* Number of events in buffer */ 4467 DWORD i = 0; /* Loop index */ 4468 DWORD curLength = 0; /* Position marker */ 4469 DWORD actualLength = 0; /* Number of bytes readable */ 4470 BOOL error = FALSE; /* Error holder */ 4471 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */ 4472 4473 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4474 return FALSE; 4475 } 4476 4477 /* Construct an array of input records in the console buffer */ 4478 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4479 if (error == 0) { 4480 return nonSeekAvailable(fd, pbytes); 4481 } 4482 4483 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */ 4484 if (numEvents > MAX_INPUT_EVENTS) { 4485 numEvents = MAX_INPUT_EVENTS; 4486 } 4487 4488 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal); 4489 if (lpBuffer == NULL) { 4490 return FALSE; 4491 } 4492 4493 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4494 if (error == 0) { 4495 os::free(lpBuffer, mtInternal); 4496 return FALSE; 4497 } 4498 4499 /* Examine input records for the number of bytes available */ 4500 for(i=0; i<numEvents; i++) { 4501 if (lpBuffer[i].EventType == KEY_EVENT) { 4502 4503 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4504 &(lpBuffer[i].Event); 4505 if (keyRecord->bKeyDown == TRUE) { 4506 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4507 curLength++; 4508 if (*keyPressed == '\r') { 4509 actualLength = curLength; 4510 } 4511 } 4512 } 4513 } 4514 4515 if(lpBuffer != NULL) { 4516 os::free(lpBuffer, mtInternal); 4517 } 4518 4519 *pbytes = (long) actualLength; 4520 return TRUE; 4521 } 4522 4523 // Map a block of memory. 4524 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4525 char *addr, size_t bytes, bool read_only, 4526 bool allow_exec) { 4527 HANDLE hFile; 4528 char* base; 4529 4530 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4531 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4532 if (hFile == NULL) { 4533 if (PrintMiscellaneous && Verbose) { 4534 DWORD err = GetLastError(); 4535 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err); 4536 } 4537 return NULL; 4538 } 4539 4540 if (allow_exec) { 4541 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4542 // unless it comes from a PE image (which the shared archive is not.) 4543 // Even VirtualProtect refuses to give execute access to mapped memory 4544 // that was not previously executable. 4545 // 4546 // Instead, stick the executable region in anonymous memory. Yuck. 4547 // Penalty is that ~4 pages will not be shareable - in the future 4548 // we might consider DLLizing the shared archive with a proper PE 4549 // header so that mapping executable + sharing is possible. 4550 4551 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4552 PAGE_READWRITE); 4553 if (base == NULL) { 4554 if (PrintMiscellaneous && Verbose) { 4555 DWORD err = GetLastError(); 4556 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 4557 } 4558 CloseHandle(hFile); 4559 return NULL; 4560 } 4561 4562 DWORD bytes_read; 4563 OVERLAPPED overlapped; 4564 overlapped.Offset = (DWORD)file_offset; 4565 overlapped.OffsetHigh = 0; 4566 overlapped.hEvent = NULL; 4567 // ReadFile guarantees that if the return value is true, the requested 4568 // number of bytes were read before returning. 4569 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 4570 if (!res) { 4571 if (PrintMiscellaneous && Verbose) { 4572 DWORD err = GetLastError(); 4573 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 4574 } 4575 release_memory(base, bytes); 4576 CloseHandle(hFile); 4577 return NULL; 4578 } 4579 } else { 4580 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 4581 NULL /*file_name*/); 4582 if (hMap == NULL) { 4583 if (PrintMiscellaneous && Verbose) { 4584 DWORD err = GetLastError(); 4585 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err); 4586 } 4587 CloseHandle(hFile); 4588 return NULL; 4589 } 4590 4591 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 4592 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 4593 (DWORD)bytes, addr); 4594 if (base == NULL) { 4595 if (PrintMiscellaneous && Verbose) { 4596 DWORD err = GetLastError(); 4597 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 4598 } 4599 CloseHandle(hMap); 4600 CloseHandle(hFile); 4601 return NULL; 4602 } 4603 4604 if (CloseHandle(hMap) == 0) { 4605 if (PrintMiscellaneous && Verbose) { 4606 DWORD err = GetLastError(); 4607 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 4608 } 4609 CloseHandle(hFile); 4610 return base; 4611 } 4612 } 4613 4614 if (allow_exec) { 4615 DWORD old_protect; 4616 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 4617 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 4618 4619 if (!res) { 4620 if (PrintMiscellaneous && Verbose) { 4621 DWORD err = GetLastError(); 4622 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 4623 } 4624 // Don't consider this a hard error, on IA32 even if the 4625 // VirtualProtect fails, we should still be able to execute 4626 CloseHandle(hFile); 4627 return base; 4628 } 4629 } 4630 4631 if (CloseHandle(hFile) == 0) { 4632 if (PrintMiscellaneous && Verbose) { 4633 DWORD err = GetLastError(); 4634 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 4635 } 4636 return base; 4637 } 4638 4639 return base; 4640 } 4641 4642 4643 // Remap a block of memory. 4644 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4645 char *addr, size_t bytes, bool read_only, 4646 bool allow_exec) { 4647 // This OS does not allow existing memory maps to be remapped so we 4648 // have to unmap the memory before we remap it. 4649 if (!os::unmap_memory(addr, bytes)) { 4650 return NULL; 4651 } 4652 4653 // There is a very small theoretical window between the unmap_memory() 4654 // call above and the map_memory() call below where a thread in native 4655 // code may be able to access an address that is no longer mapped. 4656 4657 return os::map_memory(fd, file_name, file_offset, addr, bytes, 4658 read_only, allow_exec); 4659 } 4660 4661 4662 // Unmap a block of memory. 4663 // Returns true=success, otherwise false. 4664 4665 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4666 BOOL result = UnmapViewOfFile(addr); 4667 if (result == 0) { 4668 if (PrintMiscellaneous && Verbose) { 4669 DWORD err = GetLastError(); 4670 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 4671 } 4672 return false; 4673 } 4674 return true; 4675 } 4676 4677 void os::pause() { 4678 char filename[MAX_PATH]; 4679 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4680 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4681 } else { 4682 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4683 } 4684 4685 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4686 if (fd != -1) { 4687 struct stat buf; 4688 ::close(fd); 4689 while (::stat(filename, &buf) == 0) { 4690 Sleep(100); 4691 } 4692 } else { 4693 jio_fprintf(stderr, 4694 "Could not open pause file '%s', continuing immediately.\n", filename); 4695 } 4696 } 4697 4698 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 4699 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 4700 } 4701 4702 /* 4703 * See the caveats for this class in os_windows.hpp 4704 * Protects the callback call so that raised OS EXCEPTIONS causes a jump back 4705 * into this method and returns false. If no OS EXCEPTION was raised, returns 4706 * true. 4707 * The callback is supposed to provide the method that should be protected. 4708 */ 4709 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 4710 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); 4711 assert(!WatcherThread::watcher_thread()->has_crash_protection(), 4712 "crash_protection already set?"); 4713 4714 bool success = true; 4715 __try { 4716 WatcherThread::watcher_thread()->set_crash_protection(this); 4717 cb.call(); 4718 } __except(EXCEPTION_EXECUTE_HANDLER) { 4719 // only for protection, nothing to do 4720 success = false; 4721 } 4722 WatcherThread::watcher_thread()->set_crash_protection(NULL); 4723 return success; 4724 } 4725 4726 // An Event wraps a win32 "CreateEvent" kernel handle. 4727 // 4728 // We have a number of choices regarding "CreateEvent" win32 handle leakage: 4729 // 4730 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 4731 // field, and call CloseHandle() on the win32 event handle. Unpark() would 4732 // need to be modified to tolerate finding a NULL (invalid) win32 event handle. 4733 // In addition, an unpark() operation might fetch the handle field, but the 4734 // event could recycle between the fetch and the SetEvent() operation. 4735 // SetEvent() would either fail because the handle was invalid, or inadvertently work, 4736 // as the win32 handle value had been recycled. In an ideal world calling SetEvent() 4737 // on an stale but recycled handle would be harmless, but in practice this might 4738 // confuse other non-Sun code, so it's not a viable approach. 4739 // 4740 // 2: Once a win32 event handle is associated with an Event, it remains associated 4741 // with the Event. The event handle is never closed. This could be construed 4742 // as handle leakage, but only up to the maximum # of threads that have been extant 4743 // at any one time. This shouldn't be an issue, as windows platforms typically 4744 // permit a process to have hundreds of thousands of open handles. 4745 // 4746 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 4747 // and release unused handles. 4748 // 4749 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 4750 // It's not clear, however, that we wouldn't be trading one type of leak for another. 4751 // 4752 // 5. Use an RCU-like mechanism (Read-Copy Update). 4753 // Or perhaps something similar to Maged Michael's "Hazard pointers". 4754 // 4755 // We use (2). 4756 // 4757 // TODO-FIXME: 4758 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 4759 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 4760 // to recover from (or at least detect) the dreaded Windows 841176 bug. 4761 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 4762 // into a single win32 CreateEvent() handle. 4763 // 4764 // _Event transitions in park() 4765 // -1 => -1 : illegal 4766 // 1 => 0 : pass - return immediately 4767 // 0 => -1 : block 4768 // 4769 // _Event serves as a restricted-range semaphore : 4770 // -1 : thread is blocked 4771 // 0 : neutral - thread is running or ready 4772 // 1 : signaled - thread is running or ready 4773 // 4774 // Another possible encoding of _Event would be 4775 // with explicit "PARKED" and "SIGNALED" bits. 4776 4777 int os::PlatformEvent::park (jlong Millis) { 4778 guarantee (_ParkHandle != NULL , "Invariant") ; 4779 guarantee (Millis > 0 , "Invariant") ; 4780 int v ; 4781 4782 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 4783 // the initial park() operation. 4784 4785 for (;;) { 4786 v = _Event ; 4787 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4788 } 4789 guarantee ((v == 0) || (v == 1), "invariant") ; 4790 if (v != 0) return OS_OK ; 4791 4792 // Do this the hard way by blocking ... 4793 // TODO: consider a brief spin here, gated on the success of recent 4794 // spin attempts by this thread. 4795 // 4796 // We decompose long timeouts into series of shorter timed waits. 4797 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 4798 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 4799 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 4800 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 4801 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 4802 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 4803 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 4804 // for the already waited time. This policy does not admit any new outcomes. 4805 // In the future, however, we might want to track the accumulated wait time and 4806 // adjust Millis accordingly if we encounter a spurious wakeup. 4807 4808 const int MAXTIMEOUT = 0x10000000 ; 4809 DWORD rv = WAIT_TIMEOUT ; 4810 while (_Event < 0 && Millis > 0) { 4811 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT) 4812 if (Millis > MAXTIMEOUT) { 4813 prd = MAXTIMEOUT ; 4814 } 4815 rv = ::WaitForSingleObject (_ParkHandle, prd) ; 4816 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ; 4817 if (rv == WAIT_TIMEOUT) { 4818 Millis -= prd ; 4819 } 4820 } 4821 v = _Event ; 4822 _Event = 0 ; 4823 // see comment at end of os::PlatformEvent::park() below: 4824 OrderAccess::fence() ; 4825 // If we encounter a nearly simultanous timeout expiry and unpark() 4826 // we return OS_OK indicating we awoke via unpark(). 4827 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 4828 return (v >= 0) ? OS_OK : OS_TIMEOUT ; 4829 } 4830 4831 void os::PlatformEvent::park () { 4832 guarantee (_ParkHandle != NULL, "Invariant") ; 4833 // Invariant: Only the thread associated with the Event/PlatformEvent 4834 // may call park(). 4835 int v ; 4836 for (;;) { 4837 v = _Event ; 4838 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4839 } 4840 guarantee ((v == 0) || (v == 1), "invariant") ; 4841 if (v != 0) return ; 4842 4843 // Do this the hard way by blocking ... 4844 // TODO: consider a brief spin here, gated on the success of recent 4845 // spin attempts by this thread. 4846 while (_Event < 0) { 4847 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ; 4848 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ; 4849 } 4850 4851 // Usually we'll find _Event == 0 at this point, but as 4852 // an optional optimization we clear it, just in case can 4853 // multiple unpark() operations drove _Event up to 1. 4854 _Event = 0 ; 4855 OrderAccess::fence() ; 4856 guarantee (_Event >= 0, "invariant") ; 4857 } 4858 4859 void os::PlatformEvent::unpark() { 4860 guarantee (_ParkHandle != NULL, "Invariant") ; 4861 4862 // Transitions for _Event: 4863 // 0 :=> 1 4864 // 1 :=> 1 4865 // -1 :=> either 0 or 1; must signal target thread 4866 // That is, we can safely transition _Event from -1 to either 4867 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back 4868 // unpark() calls. 4869 // See also: "Semaphores in Plan 9" by Mullender & Cox 4870 // 4871 // Note: Forcing a transition from "-1" to "1" on an unpark() means 4872 // that it will take two back-to-back park() calls for the owning 4873 // thread to block. This has the benefit of forcing a spurious return 4874 // from the first park() call after an unpark() call which will help 4875 // shake out uses of park() and unpark() without condition variables. 4876 4877 if (Atomic::xchg(1, &_Event) >= 0) return; 4878 4879 ::SetEvent(_ParkHandle); 4880 } 4881 4882 4883 // JSR166 4884 // ------------------------------------------------------- 4885 4886 /* 4887 * The Windows implementation of Park is very straightforward: Basic 4888 * operations on Win32 Events turn out to have the right semantics to 4889 * use them directly. We opportunistically resuse the event inherited 4890 * from Monitor. 4891 */ 4892 4893 4894 void Parker::park(bool isAbsolute, jlong time) { 4895 guarantee (_ParkEvent != NULL, "invariant") ; 4896 // First, demultiplex/decode time arguments 4897 if (time < 0) { // don't wait 4898 return; 4899 } 4900 else if (time == 0 && !isAbsolute) { 4901 time = INFINITE; 4902 } 4903 else if (isAbsolute) { 4904 time -= os::javaTimeMillis(); // convert to relative time 4905 if (time <= 0) // already elapsed 4906 return; 4907 } 4908 else { // relative 4909 time /= 1000000; // Must coarsen from nanos to millis 4910 if (time == 0) // Wait for the minimal time unit if zero 4911 time = 1; 4912 } 4913 4914 JavaThread* thread = (JavaThread*)(Thread::current()); 4915 assert(thread->is_Java_thread(), "Must be JavaThread"); 4916 JavaThread *jt = (JavaThread *)thread; 4917 4918 // Don't wait if interrupted or already triggered 4919 if (Thread::is_interrupted(thread, false) || 4920 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 4921 ResetEvent(_ParkEvent); 4922 return; 4923 } 4924 else { 4925 ThreadBlockInVM tbivm(jt); 4926 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4927 jt->set_suspend_equivalent(); 4928 4929 WaitForSingleObject(_ParkEvent, time); 4930 ResetEvent(_ParkEvent); 4931 4932 // If externally suspended while waiting, re-suspend 4933 if (jt->handle_special_suspend_equivalent_condition()) { 4934 jt->java_suspend_self(); 4935 } 4936 } 4937 } 4938 4939 void Parker::unpark() { 4940 guarantee (_ParkEvent != NULL, "invariant") ; 4941 SetEvent(_ParkEvent); 4942 } 4943 4944 // Run the specified command in a separate process. Return its exit value, 4945 // or -1 on failure (e.g. can't create a new process). 4946 int os::fork_and_exec(char* cmd) { 4947 STARTUPINFO si; 4948 PROCESS_INFORMATION pi; 4949 4950 memset(&si, 0, sizeof(si)); 4951 si.cb = sizeof(si); 4952 memset(&pi, 0, sizeof(pi)); 4953 BOOL rslt = CreateProcess(NULL, // executable name - use command line 4954 cmd, // command line 4955 NULL, // process security attribute 4956 NULL, // thread security attribute 4957 TRUE, // inherits system handles 4958 0, // no creation flags 4959 NULL, // use parent's environment block 4960 NULL, // use parent's starting directory 4961 &si, // (in) startup information 4962 &pi); // (out) process information 4963 4964 if (rslt) { 4965 // Wait until child process exits. 4966 WaitForSingleObject(pi.hProcess, INFINITE); 4967 4968 DWORD exit_code; 4969 GetExitCodeProcess(pi.hProcess, &exit_code); 4970 4971 // Close process and thread handles. 4972 CloseHandle(pi.hProcess); 4973 CloseHandle(pi.hThread); 4974 4975 return (int)exit_code; 4976 } else { 4977 return -1; 4978 } 4979 } 4980 4981 //-------------------------------------------------------------------------------------------------- 4982 // Non-product code 4983 4984 static int mallocDebugIntervalCounter = 0; 4985 static int mallocDebugCounter = 0; 4986 bool os::check_heap(bool force) { 4987 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 4988 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 4989 // Note: HeapValidate executes two hardware breakpoints when it finds something 4990 // wrong; at these points, eax contains the address of the offending block (I think). 4991 // To get to the exlicit error message(s) below, just continue twice. 4992 HANDLE heap = GetProcessHeap(); 4993 { HeapLock(heap); 4994 PROCESS_HEAP_ENTRY phe; 4995 phe.lpData = NULL; 4996 while (HeapWalk(heap, &phe) != 0) { 4997 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 4998 !HeapValidate(heap, 0, phe.lpData)) { 4999 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 5000 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 5001 fatal("corrupted C heap"); 5002 } 5003 } 5004 DWORD err = GetLastError(); 5005 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 5006 fatal(err_msg("heap walk aborted with error %d", err)); 5007 } 5008 HeapUnlock(heap); 5009 } 5010 mallocDebugIntervalCounter = 0; 5011 } 5012 return true; 5013 } 5014 5015 5016 bool os::find(address addr, outputStream* st) { 5017 // Nothing yet 5018 return false; 5019 } 5020 5021 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 5022 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 5023 5024 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { 5025 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow(); 5026 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 5027 address addr = (address) exceptionRecord->ExceptionInformation[1]; 5028 5029 if (os::is_memory_serialize_page(thread, addr)) 5030 return EXCEPTION_CONTINUE_EXECUTION; 5031 } 5032 5033 return EXCEPTION_CONTINUE_SEARCH; 5034 } 5035 5036 // We don't build a headless jre for Windows 5037 bool os::is_headless_jre() { return false; } 5038 5039 static jint initSock() { 5040 WSADATA wsadata; 5041 5042 if (!os::WinSock2Dll::WinSock2Available()) { 5043 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n", 5044 ::GetLastError()); 5045 return JNI_ERR; 5046 } 5047 5048 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) { 5049 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n", 5050 ::GetLastError()); 5051 return JNI_ERR; 5052 } 5053 return JNI_OK; 5054 } 5055 5056 struct hostent* os::get_host_by_name(char* name) { 5057 return (struct hostent*)os::WinSock2Dll::gethostbyname(name); 5058 } 5059 5060 int os::socket_close(int fd) { 5061 return ::closesocket(fd); 5062 } 5063 5064 int os::socket_available(int fd, jint *pbytes) { 5065 int ret = ::ioctlsocket(fd, FIONREAD, (u_long*)pbytes); 5066 return (ret < 0) ? 0 : 1; 5067 } 5068 5069 int os::socket(int domain, int type, int protocol) { 5070 return ::socket(domain, type, protocol); 5071 } 5072 5073 int os::listen(int fd, int count) { 5074 return ::listen(fd, count); 5075 } 5076 5077 int os::connect(int fd, struct sockaddr* him, socklen_t len) { 5078 return ::connect(fd, him, len); 5079 } 5080 5081 int os::accept(int fd, struct sockaddr* him, socklen_t* len) { 5082 return ::accept(fd, him, len); 5083 } 5084 5085 int os::sendto(int fd, char* buf, size_t len, uint flags, 5086 struct sockaddr* to, socklen_t tolen) { 5087 5088 return ::sendto(fd, buf, (int)len, flags, to, tolen); 5089 } 5090 5091 int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags, 5092 sockaddr* from, socklen_t* fromlen) { 5093 5094 return ::recvfrom(fd, buf, (int)nBytes, flags, from, fromlen); 5095 } 5096 5097 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5098 return ::recv(fd, buf, (int)nBytes, flags); 5099 } 5100 5101 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5102 return ::send(fd, buf, (int)nBytes, flags); 5103 } 5104 5105 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5106 return ::send(fd, buf, (int)nBytes, flags); 5107 } 5108 5109 int os::timeout(int fd, long timeout) { 5110 fd_set tbl; 5111 struct timeval t; 5112 5113 t.tv_sec = timeout / 1000; 5114 t.tv_usec = (timeout % 1000) * 1000; 5115 5116 tbl.fd_count = 1; 5117 tbl.fd_array[0] = fd; 5118 5119 return ::select(1, &tbl, 0, 0, &t); 5120 } 5121 5122 int os::get_host_name(char* name, int namelen) { 5123 return ::gethostname(name, namelen); 5124 } 5125 5126 int os::socket_shutdown(int fd, int howto) { 5127 return ::shutdown(fd, howto); 5128 } 5129 5130 int os::bind(int fd, struct sockaddr* him, socklen_t len) { 5131 return ::bind(fd, him, len); 5132 } 5133 5134 int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) { 5135 return ::getsockname(fd, him, len); 5136 } 5137 5138 int os::get_sock_opt(int fd, int level, int optname, 5139 char* optval, socklen_t* optlen) { 5140 return ::getsockopt(fd, level, optname, optval, optlen); 5141 } 5142 5143 int os::set_sock_opt(int fd, int level, int optname, 5144 const char* optval, socklen_t optlen) { 5145 return ::setsockopt(fd, level, optname, optval, optlen); 5146 } 5147 5148 // WINDOWS CONTEXT Flags for THREAD_SAMPLING 5149 #if defined(IA32) 5150 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS) 5151 #elif defined (AMD64) 5152 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT) 5153 #endif 5154 5155 // returns true if thread could be suspended, 5156 // false otherwise 5157 static bool do_suspend(HANDLE* h) { 5158 if (h != NULL) { 5159 if (SuspendThread(*h) != ~0) { 5160 return true; 5161 } 5162 } 5163 return false; 5164 } 5165 5166 // resume the thread 5167 // calling resume on an active thread is a no-op 5168 static void do_resume(HANDLE* h) { 5169 if (h != NULL) { 5170 ResumeThread(*h); 5171 } 5172 } 5173 5174 // retrieve a suspend/resume context capable handle 5175 // from the tid. Caller validates handle return value. 5176 void get_thread_handle_for_extended_context(HANDLE* h, OSThread::thread_id_t tid) { 5177 if (h != NULL) { 5178 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid); 5179 } 5180 } 5181 5182 // 5183 // Thread sampling implementation 5184 // 5185 void os::SuspendedThreadTask::internal_do_task() { 5186 CONTEXT ctxt; 5187 HANDLE h = NULL; 5188 5189 // get context capable handle for thread 5190 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id()); 5191 5192 // sanity 5193 if (h == NULL || h == INVALID_HANDLE_VALUE) { 5194 return; 5195 } 5196 5197 // suspend the thread 5198 if (do_suspend(&h)) { 5199 ctxt.ContextFlags = sampling_context_flags; 5200 // get thread context 5201 GetThreadContext(h, &ctxt); 5202 SuspendedThreadTaskContext context(_thread, &ctxt); 5203 // pass context to Thread Sampling impl 5204 do_task(context); 5205 // resume thread 5206 do_resume(&h); 5207 } 5208 5209 // close handle 5210 CloseHandle(h); 5211 } 5212 5213 5214 // Kernel32 API 5215 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void); 5216 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD); 5217 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG); 5218 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG); 5219 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG); 5220 5221 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL; 5222 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL; 5223 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL; 5224 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL; 5225 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL; 5226 5227 5228 BOOL os::Kernel32Dll::initialized = FALSE; 5229 SIZE_T os::Kernel32Dll::GetLargePageMinimum() { 5230 assert(initialized && _GetLargePageMinimum != NULL, 5231 "GetLargePageMinimumAvailable() not yet called"); 5232 return _GetLargePageMinimum(); 5233 } 5234 5235 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() { 5236 if (!initialized) { 5237 initialize(); 5238 } 5239 return _GetLargePageMinimum != NULL; 5240 } 5241 5242 BOOL os::Kernel32Dll::NumaCallsAvailable() { 5243 if (!initialized) { 5244 initialize(); 5245 } 5246 return _VirtualAllocExNuma != NULL; 5247 } 5248 5249 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) { 5250 assert(initialized && _VirtualAllocExNuma != NULL, 5251 "NUMACallsAvailable() not yet called"); 5252 5253 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node); 5254 } 5255 5256 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) { 5257 assert(initialized && _GetNumaHighestNodeNumber != NULL, 5258 "NUMACallsAvailable() not yet called"); 5259 5260 return _GetNumaHighestNodeNumber(ptr_highest_node_number); 5261 } 5262 5263 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) { 5264 assert(initialized && _GetNumaNodeProcessorMask != NULL, 5265 "NUMACallsAvailable() not yet called"); 5266 5267 return _GetNumaNodeProcessorMask(node, proc_mask); 5268 } 5269 5270 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip, 5271 ULONG FrameToCapture, PVOID* BackTrace, PULONG BackTraceHash) { 5272 if (!initialized) { 5273 initialize(); 5274 } 5275 5276 if (_RtlCaptureStackBackTrace != NULL) { 5277 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture, 5278 BackTrace, BackTraceHash); 5279 } else { 5280 return 0; 5281 } 5282 } 5283 5284 void os::Kernel32Dll::initializeCommon() { 5285 if (!initialized) { 5286 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5287 assert(handle != NULL, "Just check"); 5288 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum"); 5289 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma"); 5290 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber"); 5291 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask"); 5292 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace"); 5293 initialized = TRUE; 5294 } 5295 } 5296 5297 5298 5299 #ifndef JDK6_OR_EARLIER 5300 5301 void os::Kernel32Dll::initialize() { 5302 initializeCommon(); 5303 } 5304 5305 5306 // Kernel32 API 5307 inline BOOL os::Kernel32Dll::SwitchToThread() { 5308 return ::SwitchToThread(); 5309 } 5310 5311 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5312 return true; 5313 } 5314 5315 // Help tools 5316 inline BOOL os::Kernel32Dll::HelpToolsAvailable() { 5317 return true; 5318 } 5319 5320 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) { 5321 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5322 } 5323 5324 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5325 return ::Module32First(hSnapshot, lpme); 5326 } 5327 5328 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5329 return ::Module32Next(hSnapshot, lpme); 5330 } 5331 5332 5333 inline BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() { 5334 return true; 5335 } 5336 5337 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5338 ::GetNativeSystemInfo(lpSystemInfo); 5339 } 5340 5341 // PSAPI API 5342 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) { 5343 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5344 } 5345 5346 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) { 5347 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5348 } 5349 5350 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) { 5351 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5352 } 5353 5354 inline BOOL os::PSApiDll::PSApiAvailable() { 5355 return true; 5356 } 5357 5358 5359 // WinSock2 API 5360 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) { 5361 return ::WSAStartup(wVersionRequested, lpWSAData); 5362 } 5363 5364 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5365 return ::gethostbyname(name); 5366 } 5367 5368 inline BOOL os::WinSock2Dll::WinSock2Available() { 5369 return true; 5370 } 5371 5372 // Advapi API 5373 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5374 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength, 5375 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) { 5376 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5377 BufferLength, PreviousState, ReturnLength); 5378 } 5379 5380 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess, 5381 PHANDLE TokenHandle) { 5382 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5383 } 5384 5385 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) { 5386 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5387 } 5388 5389 inline BOOL os::Advapi32Dll::AdvapiAvailable() { 5390 return true; 5391 } 5392 5393 void* os::get_default_process_handle() { 5394 return (void*)GetModuleHandle(NULL); 5395 } 5396 5397 // Builds a platform dependent Agent_OnLoad_<lib_name> function name 5398 // which is used to find statically linked in agents. 5399 // Additionally for windows, takes into account __stdcall names. 5400 // Parameters: 5401 // sym_name: Symbol in library we are looking for 5402 // lib_name: Name of library to look in, NULL for shared libs. 5403 // is_absolute_path == true if lib_name is absolute path to agent 5404 // such as "C:/a/b/L.dll" 5405 // == false if only the base name of the library is passed in 5406 // such as "L" 5407 char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 5408 bool is_absolute_path) { 5409 char *agent_entry_name; 5410 size_t len; 5411 size_t name_len; 5412 size_t prefix_len = strlen(JNI_LIB_PREFIX); 5413 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 5414 const char *start; 5415 5416 if (lib_name != NULL) { 5417 len = name_len = strlen(lib_name); 5418 if (is_absolute_path) { 5419 // Need to strip path, prefix and suffix 5420 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 5421 lib_name = ++start; 5422 } else { 5423 // Need to check for drive prefix 5424 if ((start = strchr(lib_name, ':')) != NULL) { 5425 lib_name = ++start; 5426 } 5427 } 5428 if (len <= (prefix_len + suffix_len)) { 5429 return NULL; 5430 } 5431 lib_name += prefix_len; 5432 name_len = strlen(lib_name) - suffix_len; 5433 } 5434 } 5435 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 5436 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 5437 if (agent_entry_name == NULL) { 5438 return NULL; 5439 } 5440 if (lib_name != NULL) { 5441 const char *p = strrchr(sym_name, '@'); 5442 if (p != NULL && p != sym_name) { 5443 // sym_name == _Agent_OnLoad@XX 5444 strncpy(agent_entry_name, sym_name, (p - sym_name)); 5445 agent_entry_name[(p-sym_name)] = '\0'; 5446 // agent_entry_name == _Agent_OnLoad 5447 strcat(agent_entry_name, "_"); 5448 strncat(agent_entry_name, lib_name, name_len); 5449 strcat(agent_entry_name, p); 5450 // agent_entry_name == _Agent_OnLoad_lib_name@XX 5451 } else { 5452 strcpy(agent_entry_name, sym_name); 5453 strcat(agent_entry_name, "_"); 5454 strncat(agent_entry_name, lib_name, name_len); 5455 } 5456 } else { 5457 strcpy(agent_entry_name, sym_name); 5458 } 5459 return agent_entry_name; 5460 } 5461 5462 #else 5463 // Kernel32 API 5464 typedef BOOL (WINAPI* SwitchToThread_Fn)(void); 5465 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD); 5466 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32); 5467 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32); 5468 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO); 5469 5470 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL; 5471 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL; 5472 Module32First_Fn os::Kernel32Dll::_Module32First = NULL; 5473 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL; 5474 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL; 5475 5476 void os::Kernel32Dll::initialize() { 5477 if (!initialized) { 5478 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5479 assert(handle != NULL, "Just check"); 5480 5481 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread"); 5482 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn) 5483 ::GetProcAddress(handle, "CreateToolhelp32Snapshot"); 5484 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First"); 5485 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next"); 5486 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo"); 5487 initializeCommon(); // resolve the functions that always need resolving 5488 5489 initialized = TRUE; 5490 } 5491 } 5492 5493 BOOL os::Kernel32Dll::SwitchToThread() { 5494 assert(initialized && _SwitchToThread != NULL, 5495 "SwitchToThreadAvailable() not yet called"); 5496 return _SwitchToThread(); 5497 } 5498 5499 5500 BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5501 if (!initialized) { 5502 initialize(); 5503 } 5504 return _SwitchToThread != NULL; 5505 } 5506 5507 // Help tools 5508 BOOL os::Kernel32Dll::HelpToolsAvailable() { 5509 if (!initialized) { 5510 initialize(); 5511 } 5512 return _CreateToolhelp32Snapshot != NULL && 5513 _Module32First != NULL && 5514 _Module32Next != NULL; 5515 } 5516 5517 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) { 5518 assert(initialized && _CreateToolhelp32Snapshot != NULL, 5519 "HelpToolsAvailable() not yet called"); 5520 5521 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5522 } 5523 5524 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5525 assert(initialized && _Module32First != NULL, 5526 "HelpToolsAvailable() not yet called"); 5527 5528 return _Module32First(hSnapshot, lpme); 5529 } 5530 5531 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5532 assert(initialized && _Module32Next != NULL, 5533 "HelpToolsAvailable() not yet called"); 5534 5535 return _Module32Next(hSnapshot, lpme); 5536 } 5537 5538 5539 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() { 5540 if (!initialized) { 5541 initialize(); 5542 } 5543 return _GetNativeSystemInfo != NULL; 5544 } 5545 5546 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5547 assert(initialized && _GetNativeSystemInfo != NULL, 5548 "GetNativeSystemInfoAvailable() not yet called"); 5549 5550 _GetNativeSystemInfo(lpSystemInfo); 5551 } 5552 5553 // PSAPI API 5554 5555 5556 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD); 5557 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);; 5558 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD); 5559 5560 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL; 5561 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL; 5562 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL; 5563 BOOL os::PSApiDll::initialized = FALSE; 5564 5565 void os::PSApiDll::initialize() { 5566 if (!initialized) { 5567 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0); 5568 if (handle != NULL) { 5569 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle, 5570 "EnumProcessModules"); 5571 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle, 5572 "GetModuleFileNameExA"); 5573 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle, 5574 "GetModuleInformation"); 5575 } 5576 initialized = TRUE; 5577 } 5578 } 5579 5580 5581 5582 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) { 5583 assert(initialized && _EnumProcessModules != NULL, 5584 "PSApiAvailable() not yet called"); 5585 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5586 } 5587 5588 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) { 5589 assert(initialized && _GetModuleFileNameEx != NULL, 5590 "PSApiAvailable() not yet called"); 5591 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5592 } 5593 5594 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) { 5595 assert(initialized && _GetModuleInformation != NULL, 5596 "PSApiAvailable() not yet called"); 5597 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5598 } 5599 5600 BOOL os::PSApiDll::PSApiAvailable() { 5601 if (!initialized) { 5602 initialize(); 5603 } 5604 return _EnumProcessModules != NULL && 5605 _GetModuleFileNameEx != NULL && 5606 _GetModuleInformation != NULL; 5607 } 5608 5609 5610 // WinSock2 API 5611 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA); 5612 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...); 5613 5614 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL; 5615 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL; 5616 BOOL os::WinSock2Dll::initialized = FALSE; 5617 5618 void os::WinSock2Dll::initialize() { 5619 if (!initialized) { 5620 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0); 5621 if (handle != NULL) { 5622 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup"); 5623 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname"); 5624 } 5625 initialized = TRUE; 5626 } 5627 } 5628 5629 5630 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) { 5631 assert(initialized && _WSAStartup != NULL, 5632 "WinSock2Available() not yet called"); 5633 return _WSAStartup(wVersionRequested, lpWSAData); 5634 } 5635 5636 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5637 assert(initialized && _gethostbyname != NULL, 5638 "WinSock2Available() not yet called"); 5639 return _gethostbyname(name); 5640 } 5641 5642 BOOL os::WinSock2Dll::WinSock2Available() { 5643 if (!initialized) { 5644 initialize(); 5645 } 5646 return _WSAStartup != NULL && 5647 _gethostbyname != NULL; 5648 } 5649 5650 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 5651 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE); 5652 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID); 5653 5654 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL; 5655 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL; 5656 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL; 5657 BOOL os::Advapi32Dll::initialized = FALSE; 5658 5659 void os::Advapi32Dll::initialize() { 5660 if (!initialized) { 5661 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0); 5662 if (handle != NULL) { 5663 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle, 5664 "AdjustTokenPrivileges"); 5665 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle, 5666 "OpenProcessToken"); 5667 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle, 5668 "LookupPrivilegeValueA"); 5669 } 5670 initialized = TRUE; 5671 } 5672 } 5673 5674 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5675 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength, 5676 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) { 5677 assert(initialized && _AdjustTokenPrivileges != NULL, 5678 "AdvapiAvailable() not yet called"); 5679 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5680 BufferLength, PreviousState, ReturnLength); 5681 } 5682 5683 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess, 5684 PHANDLE TokenHandle) { 5685 assert(initialized && _OpenProcessToken != NULL, 5686 "AdvapiAvailable() not yet called"); 5687 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5688 } 5689 5690 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) { 5691 assert(initialized && _LookupPrivilegeValue != NULL, 5692 "AdvapiAvailable() not yet called"); 5693 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5694 } 5695 5696 BOOL os::Advapi32Dll::AdvapiAvailable() { 5697 if (!initialized) { 5698 initialize(); 5699 } 5700 return _AdjustTokenPrivileges != NULL && 5701 _OpenProcessToken != NULL && 5702 _LookupPrivilegeValue != NULL; 5703 } 5704 5705 #endif 5706 5707 #ifndef PRODUCT 5708 5709 // test the code path in reserve_memory_special() that tries to allocate memory in a single 5710 // contiguous memory block at a particular address. 5711 // The test first tries to find a good approximate address to allocate at by using the same 5712 // method to allocate some memory at any address. The test then tries to allocate memory in 5713 // the vicinity (not directly after it to avoid possible by-chance use of that location) 5714 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of 5715 // the previously allocated memory is available for allocation. The only actual failure 5716 // that is reported is when the test tries to allocate at a particular location but gets a 5717 // different valid one. A NULL return value at this point is not considered an error but may 5718 // be legitimate. 5719 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages. 5720 void TestReserveMemorySpecial_test() { 5721 if (!UseLargePages) { 5722 if (VerboseInternalVMTests) { 5723 gclog_or_tty->print("Skipping test because large pages are disabled"); 5724 } 5725 return; 5726 } 5727 // save current value of globals 5728 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; 5729 bool old_use_numa_interleaving = UseNUMAInterleaving; 5730 5731 // set globals to make sure we hit the correct code path 5732 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; 5733 5734 // do an allocation at an address selected by the OS to get a good one. 5735 const size_t large_allocation_size = os::large_page_size() * 4; 5736 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); 5737 if (result == NULL) { 5738 if (VerboseInternalVMTests) { 5739 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.", 5740 large_allocation_size); 5741 } 5742 } else { 5743 os::release_memory_special(result, large_allocation_size); 5744 5745 // allocate another page within the recently allocated memory area which seems to be a good location. At least 5746 // we managed to get it once. 5747 const size_t expected_allocation_size = os::large_page_size(); 5748 char* expected_location = result + os::large_page_size(); 5749 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); 5750 if (actual_location == NULL) { 5751 if (VerboseInternalVMTests) { 5752 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.", 5753 expected_location, large_allocation_size); 5754 } 5755 } else { 5756 // release memory 5757 os::release_memory_special(actual_location, expected_allocation_size); 5758 // only now check, after releasing any memory to avoid any leaks. 5759 assert(actual_location == expected_location, 5760 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead", 5761 expected_location, expected_allocation_size, actual_location)); 5762 } 5763 } 5764 5765 // restore globals 5766 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; 5767 UseNUMAInterleaving = old_use_numa_interleaving; 5768 } 5769 #endif // PRODUCT 5770