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