1 /* 2 * Copyright (c) 1997, 2014, 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 "os_windows.inline.hpp" 44 #include "prims/jniFastGetField.hpp" 45 #include "prims/jvm.h" 46 #include "prims/jvm_misc.hpp" 47 #include "runtime/arguments.hpp" 48 #include "runtime/atomic.inline.hpp" 49 #include "runtime/extendedPC.hpp" 50 #include "runtime/globals.hpp" 51 #include "runtime/interfaceSupport.hpp" 52 #include "runtime/java.hpp" 53 #include "runtime/javaCalls.hpp" 54 #include "runtime/mutexLocker.hpp" 55 #include "runtime/objectMonitor.hpp" 56 #include "runtime/orderAccess.inline.hpp" 57 #include "runtime/osThread.hpp" 58 #include "runtime/perfMemory.hpp" 59 #include "runtime/sharedRuntime.hpp" 60 #include "runtime/statSampler.hpp" 61 #include "runtime/stubRoutines.hpp" 62 #include "runtime/thread.inline.hpp" 63 #include "runtime/threadCritical.hpp" 64 #include "runtime/timer.hpp" 65 #include "services/attachListener.hpp" 66 #include "services/memTracker.hpp" 67 #include "services/runtimeService.hpp" 68 #include "utilities/decoder.hpp" 69 #include "utilities/defaultStream.hpp" 70 #include "utilities/events.hpp" 71 #include "utilities/growableArray.hpp" 72 #include "utilities/vmError.hpp" 73 74 #ifdef _DEBUG 75 #include <crtdbg.h> 76 #endif 77 78 79 #include <windows.h> 80 #include <sys/types.h> 81 #include <sys/stat.h> 82 #include <sys/timeb.h> 83 #include <objidl.h> 84 #include <shlobj.h> 85 86 #include <malloc.h> 87 #include <signal.h> 88 #include <direct.h> 89 #include <errno.h> 90 #include <fcntl.h> 91 #include <io.h> 92 #include <process.h> // For _beginthreadex(), _endthreadex() 93 #include <imagehlp.h> // For os::dll_address_to_function_name 94 /* for enumerating dll libraries */ 95 #include <vdmdbg.h> 96 97 // for timer info max values which include all bits 98 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 99 100 // For DLL loading/load error detection 101 // Values of PE COFF 102 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c 103 #define IMAGE_FILE_SIGNATURE_LENGTH 4 104 105 static HANDLE main_process; 106 static HANDLE main_thread; 107 static int main_thread_id; 108 109 static FILETIME process_creation_time; 110 static FILETIME process_exit_time; 111 static FILETIME process_user_time; 112 static FILETIME process_kernel_time; 113 114 #ifdef _M_IA64 115 #define __CPU__ ia64 116 #elif _M_AMD64 117 #define __CPU__ amd64 118 #else 119 #define __CPU__ i486 120 #endif 121 122 // save DLL module handle, used by GetModuleFileName 123 124 HINSTANCE vm_lib_handle; 125 126 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { 127 switch (reason) { 128 case DLL_PROCESS_ATTACH: 129 vm_lib_handle = hinst; 130 if (ForceTimeHighResolution) 131 timeBeginPeriod(1L); 132 break; 133 case DLL_PROCESS_DETACH: 134 if (ForceTimeHighResolution) 135 timeEndPeriod(1L); 136 137 // Workaround for issue when a custom launcher doesn't call 138 // DestroyJavaVM and NMT is trying to track memory when free is 139 // called from a static destructor 140 if (MemTracker::is_on()) { 141 MemTracker::shutdown(MemTracker::NMT_normal); 142 } 143 break; 144 default: 145 break; 146 } 147 return true; 148 } 149 150 static inline double fileTimeAsDouble(FILETIME* time) { 151 const double high = (double) ((unsigned int) ~0); 152 const double split = 10000000.0; 153 double result = (time->dwLowDateTime / split) + 154 time->dwHighDateTime * (high/split); 155 return result; 156 } 157 158 // Implementation of os 159 160 bool os::getenv(const char* name, char* buffer, int len) { 161 int result = GetEnvironmentVariable(name, buffer, len); 162 return result > 0 && result < len; 163 } 164 165 166 // No setuid programs under Windows. 167 bool os::have_special_privileges() { 168 return false; 169 } 170 171 172 // This method is a periodic task to check for misbehaving JNI applications 173 // under CheckJNI, we can add any periodic checks here. 174 // For Windows at the moment does nothing 175 void os::run_periodic_checks() { 176 return; 177 } 178 179 // previous UnhandledExceptionFilter, if there is one 180 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL; 181 182 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 183 void os::init_system_properties_values() { 184 /* sysclasspath, java_home, dll_dir */ 185 { 186 char *home_path; 187 char *dll_path; 188 char *pslash; 189 char *bin = "\\bin"; 190 char home_dir[MAX_PATH]; 191 192 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) { 193 os::jvm_path(home_dir, sizeof(home_dir)); 194 // Found the full path to jvm.dll. 195 // Now cut the path to <java_home>/jre if we can. 196 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */ 197 pslash = strrchr(home_dir, '\\'); 198 if (pslash != NULL) { 199 *pslash = '\0'; /* get rid of \{client|server} */ 200 pslash = strrchr(home_dir, '\\'); 201 if (pslash != NULL) 202 *pslash = '\0'; /* get rid of \bin */ 203 } 204 } 205 206 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal); 207 if (home_path == NULL) 208 return; 209 strcpy(home_path, home_dir); 210 Arguments::set_java_home(home_path); 211 212 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, mtInternal); 213 if (dll_path == NULL) 214 return; 215 strcpy(dll_path, home_dir); 216 strcat(dll_path, bin); 217 Arguments::set_dll_dir(dll_path); 218 219 if (!set_boot_path('\\', ';')) 220 return; 221 } 222 223 /* library_path */ 224 #define EXT_DIR "\\lib\\ext" 225 #define BIN_DIR "\\bin" 226 #define PACKAGE_DIR "\\Sun\\Java" 227 { 228 /* Win32 library search order (See the documentation for LoadLibrary): 229 * 230 * 1. The directory from which application is loaded. 231 * 2. The system wide Java Extensions directory (Java only) 232 * 3. System directory (GetSystemDirectory) 233 * 4. Windows directory (GetWindowsDirectory) 234 * 5. The PATH environment variable 235 * 6. The current directory 236 */ 237 238 char *library_path; 239 char tmp[MAX_PATH]; 240 char *path_str = ::getenv("PATH"); 241 242 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 243 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal); 244 245 library_path[0] = '\0'; 246 247 GetModuleFileName(NULL, tmp, sizeof(tmp)); 248 *(strrchr(tmp, '\\')) = '\0'; 249 strcat(library_path, tmp); 250 251 GetWindowsDirectory(tmp, sizeof(tmp)); 252 strcat(library_path, ";"); 253 strcat(library_path, tmp); 254 strcat(library_path, PACKAGE_DIR BIN_DIR); 255 256 GetSystemDirectory(tmp, sizeof(tmp)); 257 strcat(library_path, ";"); 258 strcat(library_path, tmp); 259 260 GetWindowsDirectory(tmp, sizeof(tmp)); 261 strcat(library_path, ";"); 262 strcat(library_path, tmp); 263 264 if (path_str) { 265 strcat(library_path, ";"); 266 strcat(library_path, path_str); 267 } 268 269 strcat(library_path, ";."); 270 271 Arguments::set_library_path(library_path); 272 FREE_C_HEAP_ARRAY(char, library_path, mtInternal); 273 } 274 275 /* Default extensions directory */ 276 { 277 char path[MAX_PATH]; 278 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 279 GetWindowsDirectory(path, MAX_PATH); 280 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 281 path, PACKAGE_DIR, EXT_DIR); 282 Arguments::set_ext_dirs(buf); 283 } 284 #undef EXT_DIR 285 #undef BIN_DIR 286 #undef PACKAGE_DIR 287 288 /* Default endorsed standards directory. */ 289 { 290 #define ENDORSED_DIR "\\lib\\endorsed" 291 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR); 292 char * buf = NEW_C_HEAP_ARRAY(char, len, mtInternal); 293 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR); 294 Arguments::set_endorsed_dirs(buf); 295 #undef ENDORSED_DIR 296 } 297 298 #ifndef _WIN64 299 // set our UnhandledExceptionFilter and save any previous one 300 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception); 301 #endif 302 303 // Done 304 return; 305 } 306 307 void os::breakpoint() { 308 DebugBreak(); 309 } 310 311 // Invoked from the BREAKPOINT Macro 312 extern "C" void breakpoint() { 313 os::breakpoint(); 314 } 315 316 /* 317 * RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP. 318 * So far, this method is only used by Native Memory Tracking, which is 319 * only supported on Windows XP or later. 320 */ 321 address os::get_caller_pc(int n) { 322 #ifdef _NMT_NOINLINE_ 323 n++; 324 #endif 325 address pc; 326 if (os::Kernel32Dll::RtlCaptureStackBackTrace(n + 1, 1, (PVOID*)&pc, NULL) == 1) { 327 return pc; 328 } 329 return NULL; 330 } 331 332 333 // os::current_stack_base() 334 // 335 // Returns the base of the stack, which is the stack's 336 // starting address. This function must be called 337 // while running on the stack of the thread being queried. 338 339 address os::current_stack_base() { 340 MEMORY_BASIC_INFORMATION minfo; 341 address stack_bottom; 342 size_t stack_size; 343 344 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 345 stack_bottom = (address)minfo.AllocationBase; 346 stack_size = minfo.RegionSize; 347 348 // Add up the sizes of all the regions with the same 349 // AllocationBase. 350 while (1) 351 { 352 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 353 if (stack_bottom == (address)minfo.AllocationBase) 354 stack_size += minfo.RegionSize; 355 else 356 break; 357 } 358 359 #ifdef _M_IA64 360 // IA64 has memory and register stacks 361 // 362 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit 363 // at thread creation (1MB backing store growing upwards, 1MB memory stack 364 // growing downwards, 2MB summed up) 365 // 366 // ... 367 // ------- top of stack (high address) ----- 368 // | 369 // | 1MB 370 // | Backing Store (Register Stack) 371 // | 372 // | / \ 373 // | | 374 // | | 375 // | | 376 // ------------------------ stack base ----- 377 // | 1MB 378 // | Memory Stack 379 // | 380 // | | 381 // | | 382 // | | 383 // | \ / 384 // | 385 // ----- bottom of stack (low address) ----- 386 // ... 387 388 stack_size = stack_size / 2; 389 #endif 390 return stack_bottom + stack_size; 391 } 392 393 size_t os::current_stack_size() { 394 size_t sz; 395 MEMORY_BASIC_INFORMATION minfo; 396 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 397 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 398 return sz; 399 } 400 401 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 402 const struct tm* time_struct_ptr = localtime(clock); 403 if (time_struct_ptr != NULL) { 404 *res = *time_struct_ptr; 405 return res; 406 } 407 return NULL; 408 } 409 410 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 411 412 // Thread start routine for all new Java threads 413 static unsigned __stdcall java_start(Thread* thread) { 414 // Try to randomize the cache line index of hot stack frames. 415 // This helps when threads of the same stack traces evict each other's 416 // cache lines. The threads can be either from the same JVM instance, or 417 // from different JVM instances. The benefit is especially true for 418 // processors with hyperthreading technology. 419 static int counter = 0; 420 int pid = os::current_process_id(); 421 _alloca(((pid ^ counter++) & 7) * 128); 422 423 OSThread* osthr = thread->osthread(); 424 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 425 426 if (UseNUMA) { 427 int lgrp_id = os::numa_get_group_id(); 428 if (lgrp_id != -1) { 429 thread->set_lgrp_id(lgrp_id); 430 } 431 } 432 433 434 // Install a win32 structured exception handler around every thread created 435 // by VM, so VM can genrate error dump when an exception occurred in non- 436 // Java thread (e.g. VM thread). 437 __try { 438 thread->run(); 439 } __except(topLevelExceptionFilter( 440 (_EXCEPTION_POINTERS*)_exception_info())) { 441 // Nothing to do. 442 } 443 444 // One less thread is executing 445 // When the VMThread gets here, the main thread may have already exited 446 // which frees the CodeHeap containing the Atomic::add code 447 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 448 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); 449 } 450 451 return 0; 452 } 453 454 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) { 455 // Allocate the OSThread object 456 OSThread* osthread = new OSThread(NULL, NULL); 457 if (osthread == NULL) return NULL; 458 459 // Initialize support for Java interrupts 460 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 461 if (interrupt_event == NULL) { 462 delete osthread; 463 return NULL; 464 } 465 osthread->set_interrupt_event(interrupt_event); 466 467 // Store info on the Win32 thread into the OSThread 468 osthread->set_thread_handle(thread_handle); 469 osthread->set_thread_id(thread_id); 470 471 if (UseNUMA) { 472 int lgrp_id = os::numa_get_group_id(); 473 if (lgrp_id != -1) { 474 thread->set_lgrp_id(lgrp_id); 475 } 476 } 477 478 // Initial thread state is INITIALIZED, not SUSPENDED 479 osthread->set_state(INITIALIZED); 480 481 return osthread; 482 } 483 484 485 bool os::create_attached_thread(JavaThread* thread) { 486 #ifdef ASSERT 487 thread->verify_not_published(); 488 #endif 489 HANDLE thread_h; 490 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 491 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 492 fatal("DuplicateHandle failed\n"); 493 } 494 OSThread* osthread = create_os_thread(thread, thread_h, 495 (int)current_thread_id()); 496 if (osthread == NULL) { 497 return false; 498 } 499 500 // Initial thread state is RUNNABLE 501 osthread->set_state(RUNNABLE); 502 503 thread->set_osthread(osthread); 504 return true; 505 } 506 507 bool os::create_main_thread(JavaThread* thread) { 508 #ifdef ASSERT 509 thread->verify_not_published(); 510 #endif 511 if (_starting_thread == NULL) { 512 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 513 if (_starting_thread == NULL) { 514 return false; 515 } 516 } 517 518 // The primordial thread is runnable from the start) 519 _starting_thread->set_state(RUNNABLE); 520 521 thread->set_osthread(_starting_thread); 522 return true; 523 } 524 525 // Allocate and initialize a new OSThread 526 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 527 unsigned thread_id; 528 529 // Allocate the OSThread object 530 OSThread* osthread = new OSThread(NULL, NULL); 531 if (osthread == NULL) { 532 return false; 533 } 534 535 // Initialize support for Java interrupts 536 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 537 if (interrupt_event == NULL) { 538 delete osthread; 539 return NULL; 540 } 541 osthread->set_interrupt_event(interrupt_event); 542 osthread->set_interrupted(false); 543 544 thread->set_osthread(osthread); 545 546 if (stack_size == 0) { 547 switch (thr_type) { 548 case os::java_thread: 549 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 550 if (JavaThread::stack_size_at_create() > 0) 551 stack_size = JavaThread::stack_size_at_create(); 552 break; 553 case os::compiler_thread: 554 if (CompilerThreadStackSize > 0) { 555 stack_size = (size_t)(CompilerThreadStackSize * K); 556 break; 557 } // else fall through: 558 // use VMThreadStackSize if CompilerThreadStackSize is not defined 559 case os::vm_thread: 560 case os::pgc_thread: 561 case os::cgc_thread: 562 case os::watcher_thread: 563 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 564 break; 565 } 566 } 567 568 // Create the Win32 thread 569 // 570 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 571 // does not specify stack size. Instead, it specifies the size of 572 // initially committed space. The stack size is determined by 573 // PE header in the executable. If the committed "stack_size" is larger 574 // than default value in the PE header, the stack is rounded up to the 575 // nearest multiple of 1MB. For example if the launcher has default 576 // stack size of 320k, specifying any size less than 320k does not 577 // affect the actual stack size at all, it only affects the initial 578 // commitment. On the other hand, specifying 'stack_size' larger than 579 // default value may cause significant increase in memory usage, because 580 // not only the stack space will be rounded up to MB, but also the 581 // entire space is committed upfront. 582 // 583 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 584 // for CreateThread() that can treat 'stack_size' as stack size. However we 585 // are not supposed to call CreateThread() directly according to MSDN 586 // document because JVM uses C runtime library. The good news is that the 587 // flag appears to work with _beginthredex() as well. 588 589 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION 590 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000) 591 #endif 592 593 HANDLE thread_handle = 594 (HANDLE)_beginthreadex(NULL, 595 (unsigned)stack_size, 596 (unsigned (__stdcall *)(void*)) java_start, 597 thread, 598 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, 599 &thread_id); 600 if (thread_handle == NULL) { 601 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again 602 // without the flag. 603 thread_handle = 604 (HANDLE)_beginthreadex(NULL, 605 (unsigned)stack_size, 606 (unsigned (__stdcall *)(void*)) java_start, 607 thread, 608 CREATE_SUSPENDED, 609 &thread_id); 610 } 611 if (thread_handle == NULL) { 612 // Need to clean up stuff we've allocated so far 613 CloseHandle(osthread->interrupt_event()); 614 thread->set_osthread(NULL); 615 delete osthread; 616 return NULL; 617 } 618 619 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); 620 621 // Store info on the Win32 thread into the OSThread 622 osthread->set_thread_handle(thread_handle); 623 osthread->set_thread_id(thread_id); 624 625 // Initial thread state is INITIALIZED, not SUSPENDED 626 osthread->set_state(INITIALIZED); 627 628 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 629 return true; 630 } 631 632 633 // Free Win32 resources related to the OSThread 634 void os::free_thread(OSThread* osthread) { 635 assert(osthread != NULL, "osthread not set"); 636 CloseHandle(osthread->thread_handle()); 637 CloseHandle(osthread->interrupt_event()); 638 delete osthread; 639 } 640 641 static jlong first_filetime; 642 static jlong initial_performance_count; 643 static jlong performance_frequency; 644 645 646 jlong as_long(LARGE_INTEGER x) { 647 jlong result = 0; // initialization to avoid warning 648 set_high(&result, x.HighPart); 649 set_low(&result, x.LowPart); 650 return result; 651 } 652 653 654 jlong os::elapsed_counter() { 655 LARGE_INTEGER count; 656 if (win32::_has_performance_count) { 657 QueryPerformanceCounter(&count); 658 return as_long(count) - initial_performance_count; 659 } else { 660 FILETIME wt; 661 GetSystemTimeAsFileTime(&wt); 662 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime); 663 } 664 } 665 666 667 jlong os::elapsed_frequency() { 668 if (win32::_has_performance_count) { 669 return performance_frequency; 670 } else { 671 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601. 672 return 10000000; 673 } 674 } 675 676 677 julong os::available_memory() { 678 return win32::available_memory(); 679 } 680 681 julong os::win32::available_memory() { 682 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 683 // value if total memory is larger than 4GB 684 MEMORYSTATUSEX ms; 685 ms.dwLength = sizeof(ms); 686 GlobalMemoryStatusEx(&ms); 687 688 return (julong)ms.ullAvailPhys; 689 } 690 691 julong os::physical_memory() { 692 return win32::physical_memory(); 693 } 694 695 bool os::has_allocatable_memory_limit(julong* limit) { 696 MEMORYSTATUSEX ms; 697 ms.dwLength = sizeof(ms); 698 GlobalMemoryStatusEx(&ms); 699 #ifdef _LP64 700 *limit = (julong)ms.ullAvailVirtual; 701 return true; 702 #else 703 // Limit to 1400m because of the 2gb address space wall 704 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual); 705 return true; 706 #endif 707 } 708 709 // VC6 lacks DWORD_PTR 710 #if _MSC_VER < 1300 711 typedef UINT_PTR DWORD_PTR; 712 #endif 713 714 int os::active_processor_count() { 715 DWORD_PTR lpProcessAffinityMask = 0; 716 DWORD_PTR lpSystemAffinityMask = 0; 717 int proc_count = processor_count(); 718 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 719 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 720 // Nof active processors is number of bits in process affinity mask 721 int bitcount = 0; 722 while (lpProcessAffinityMask != 0) { 723 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 724 bitcount++; 725 } 726 return bitcount; 727 } else { 728 return proc_count; 729 } 730 } 731 732 void os::set_native_thread_name(const char *name) { 733 // Not yet implemented. 734 return; 735 } 736 737 bool os::distribute_processes(uint length, uint* distribution) { 738 // Not yet implemented. 739 return false; 740 } 741 742 bool os::bind_to_processor(uint processor_id) { 743 // Not yet implemented. 744 return false; 745 } 746 747 void os::win32::initialize_performance_counter() { 748 LARGE_INTEGER count; 749 if (QueryPerformanceFrequency(&count)) { 750 win32::_has_performance_count = 1; 751 performance_frequency = as_long(count); 752 QueryPerformanceCounter(&count); 753 initial_performance_count = as_long(count); 754 } else { 755 win32::_has_performance_count = 0; 756 FILETIME wt; 757 GetSystemTimeAsFileTime(&wt); 758 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 759 } 760 } 761 762 763 double os::elapsedTime() { 764 return (double) elapsed_counter() / (double) elapsed_frequency(); 765 } 766 767 768 // Windows format: 769 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 770 // Java format: 771 // Java standards require the number of milliseconds since 1/1/1970 772 773 // Constant offset - calculated using offset() 774 static jlong _offset = 116444736000000000; 775 // Fake time counter for reproducible results when debugging 776 static jlong fake_time = 0; 777 778 #ifdef ASSERT 779 // Just to be safe, recalculate the offset in debug mode 780 static jlong _calculated_offset = 0; 781 static int _has_calculated_offset = 0; 782 783 jlong offset() { 784 if (_has_calculated_offset) return _calculated_offset; 785 SYSTEMTIME java_origin; 786 java_origin.wYear = 1970; 787 java_origin.wMonth = 1; 788 java_origin.wDayOfWeek = 0; // ignored 789 java_origin.wDay = 1; 790 java_origin.wHour = 0; 791 java_origin.wMinute = 0; 792 java_origin.wSecond = 0; 793 java_origin.wMilliseconds = 0; 794 FILETIME jot; 795 if (!SystemTimeToFileTime(&java_origin, &jot)) { 796 fatal(err_msg("Error = %d\nWindows error", GetLastError())); 797 } 798 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 799 _has_calculated_offset = 1; 800 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 801 return _calculated_offset; 802 } 803 #else 804 jlong offset() { 805 return _offset; 806 } 807 #endif 808 809 jlong windows_to_java_time(FILETIME wt) { 810 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 811 return (a - offset()) / 10000; 812 } 813 814 FILETIME java_to_windows_time(jlong l) { 815 jlong a = (l * 10000) + offset(); 816 FILETIME result; 817 result.dwHighDateTime = high(a); 818 result.dwLowDateTime = low(a); 819 return result; 820 } 821 822 bool os::supports_vtime() { return true; } 823 bool os::enable_vtime() { return false; } 824 bool os::vtime_enabled() { return false; } 825 826 double os::elapsedVTime() { 827 FILETIME created; 828 FILETIME exited; 829 FILETIME kernel; 830 FILETIME user; 831 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) { 832 // the resolution of windows_to_java_time() should be sufficient (ms) 833 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS; 834 } else { 835 return elapsedTime(); 836 } 837 } 838 839 jlong os::javaTimeMillis() { 840 if (UseFakeTimers) { 841 return fake_time++; 842 } else { 843 FILETIME wt; 844 GetSystemTimeAsFileTime(&wt); 845 return windows_to_java_time(wt); 846 } 847 } 848 849 jlong os::javaTimeNanos() { 850 if (!win32::_has_performance_count) { 851 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do. 852 } else { 853 LARGE_INTEGER current_count; 854 QueryPerformanceCounter(¤t_count); 855 double current = as_long(current_count); 856 double freq = performance_frequency; 857 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC); 858 return time; 859 } 860 } 861 862 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 863 if (!win32::_has_performance_count) { 864 // javaTimeMillis() doesn't have much percision, 865 // but it is not going to wrap -- so all 64 bits 866 info_ptr->max_value = ALL_64_BITS; 867 868 // this is a wall clock timer, so may skip 869 info_ptr->may_skip_backward = true; 870 info_ptr->may_skip_forward = true; 871 } else { 872 jlong freq = performance_frequency; 873 if (freq < NANOSECS_PER_SEC) { 874 // the performance counter is 64 bits and we will 875 // be multiplying it -- so no wrap in 64 bits 876 info_ptr->max_value = ALL_64_BITS; 877 } else if (freq > NANOSECS_PER_SEC) { 878 // use the max value the counter can reach to 879 // determine the max value which could be returned 880 julong max_counter = (julong)ALL_64_BITS; 881 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC)); 882 } else { 883 // the performance counter is 64 bits and we will 884 // be using it directly -- so no wrap in 64 bits 885 info_ptr->max_value = ALL_64_BITS; 886 } 887 888 // using a counter, so no skipping 889 info_ptr->may_skip_backward = false; 890 info_ptr->may_skip_forward = false; 891 } 892 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 893 } 894 895 char* os::local_time_string(char *buf, size_t buflen) { 896 SYSTEMTIME st; 897 GetLocalTime(&st); 898 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 899 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 900 return buf; 901 } 902 903 bool os::getTimesSecs(double* process_real_time, 904 double* process_user_time, 905 double* process_system_time) { 906 HANDLE h_process = GetCurrentProcess(); 907 FILETIME create_time, exit_time, kernel_time, user_time; 908 BOOL result = GetProcessTimes(h_process, 909 &create_time, 910 &exit_time, 911 &kernel_time, 912 &user_time); 913 if (result != 0) { 914 FILETIME wt; 915 GetSystemTimeAsFileTime(&wt); 916 jlong rtc_millis = windows_to_java_time(wt); 917 jlong user_millis = windows_to_java_time(user_time); 918 jlong system_millis = windows_to_java_time(kernel_time); 919 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 920 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); 921 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); 922 return true; 923 } else { 924 return false; 925 } 926 } 927 928 void os::shutdown() { 929 930 // allow PerfMemory to attempt cleanup of any persistent resources 931 perfMemory_exit(); 932 933 // flush buffered output, finish log files 934 ostream_abort(); 935 936 // Check for abort hook 937 abort_hook_t abort_hook = Arguments::abort_hook(); 938 if (abort_hook != NULL) { 939 abort_hook(); 940 } 941 } 942 943 944 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION, 945 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION); 946 947 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) { 948 HINSTANCE dbghelp; 949 EXCEPTION_POINTERS ep; 950 MINIDUMP_EXCEPTION_INFORMATION mei; 951 MINIDUMP_EXCEPTION_INFORMATION* pmei; 952 953 HANDLE hProcess = GetCurrentProcess(); 954 DWORD processId = GetCurrentProcessId(); 955 HANDLE dumpFile; 956 MINIDUMP_TYPE dumpType; 957 static const char* cwd; 958 959 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows. 960 #ifndef ASSERT 961 // If running on a client version of Windows and user has not explicitly enabled dumping 962 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) { 963 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false); 964 return; 965 // If running on a server version of Windows and user has explictly disabled dumping 966 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) { 967 VMError::report_coredump_status("Minidump has been disabled from the command line", false); 968 return; 969 } 970 #else 971 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) { 972 VMError::report_coredump_status("Minidump has been disabled from the command line", false); 973 return; 974 } 975 #endif 976 977 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0); 978 979 if (dbghelp == NULL) { 980 VMError::report_coredump_status("Failed to load dbghelp.dll", false); 981 return; 982 } 983 984 _MiniDumpWriteDump = CAST_TO_FN_PTR( 985 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION, 986 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION), 987 GetProcAddress(dbghelp, "MiniDumpWriteDump")); 988 989 if (_MiniDumpWriteDump == NULL) { 990 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false); 991 return; 992 } 993 994 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData); 995 996 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with 997 // API_VERSION_NUMBER 11 or higher contains the ones we want though 998 #if API_VERSION_NUMBER >= 11 999 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | 1000 MiniDumpWithUnloadedModules); 1001 #endif 1002 1003 cwd = get_current_directory(NULL, 0); 1004 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp", cwd, current_process_id()); 1005 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); 1006 1007 if (dumpFile == INVALID_HANDLE_VALUE) { 1008 VMError::report_coredump_status("Failed to create file for dumping", false); 1009 return; 1010 } 1011 if (exceptionRecord != NULL && contextRecord != NULL) { 1012 ep.ContextRecord = (PCONTEXT) contextRecord; 1013 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord; 1014 1015 mei.ThreadId = GetCurrentThreadId(); 1016 mei.ExceptionPointers = &ep; 1017 pmei = &mei; 1018 } else { 1019 pmei = NULL; 1020 } 1021 1022 1023 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all 1024 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then. 1025 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false && 1026 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) { 1027 DWORD error = GetLastError(); 1028 LPTSTR msgbuf = NULL; 1029 1030 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | 1031 FORMAT_MESSAGE_FROM_SYSTEM | 1032 FORMAT_MESSAGE_IGNORE_INSERTS, 1033 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) { 1034 1035 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf); 1036 LocalFree(msgbuf); 1037 } else { 1038 // Call to FormatMessage failed, just include the result from GetLastError 1039 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error); 1040 } 1041 VMError::report_coredump_status(buffer, false); 1042 } else { 1043 VMError::report_coredump_status(buffer, true); 1044 } 1045 1046 CloseHandle(dumpFile); 1047 } 1048 1049 1050 1051 void os::abort(bool dump_core) 1052 { 1053 os::shutdown(); 1054 // no core dump on Windows 1055 ::exit(1); 1056 } 1057 1058 // Die immediately, no exit hook, no abort hook, no cleanup. 1059 void os::die() { 1060 _exit(-1); 1061 } 1062 1063 // Directory routines copied from src/win32/native/java/io/dirent_md.c 1064 // * dirent_md.c 1.15 00/02/02 1065 // 1066 // The declarations for DIR and struct dirent are in jvm_win32.h. 1067 1068 /* Caller must have already run dirname through JVM_NativePath, which removes 1069 duplicate slashes and converts all instances of '/' into '\\'. */ 1070 1071 DIR * 1072 os::opendir(const char *dirname) 1073 { 1074 assert(dirname != NULL, "just checking"); // hotspot change 1075 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal); 1076 DWORD fattr; // hotspot change 1077 char alt_dirname[4] = { 0, 0, 0, 0 }; 1078 1079 if (dirp == 0) { 1080 errno = ENOMEM; 1081 return 0; 1082 } 1083 1084 /* 1085 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it 1086 * as a directory in FindFirstFile(). We detect this case here and 1087 * prepend the current drive name. 1088 */ 1089 if (dirname[1] == '\0' && dirname[0] == '\\') { 1090 alt_dirname[0] = _getdrive() + 'A' - 1; 1091 alt_dirname[1] = ':'; 1092 alt_dirname[2] = '\\'; 1093 alt_dirname[3] = '\0'; 1094 dirname = alt_dirname; 1095 } 1096 1097 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal); 1098 if (dirp->path == 0) { 1099 free(dirp, mtInternal); 1100 errno = ENOMEM; 1101 return 0; 1102 } 1103 strcpy(dirp->path, dirname); 1104 1105 fattr = GetFileAttributes(dirp->path); 1106 if (fattr == 0xffffffff) { 1107 free(dirp->path, mtInternal); 1108 free(dirp, mtInternal); 1109 errno = ENOENT; 1110 return 0; 1111 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 1112 free(dirp->path, mtInternal); 1113 free(dirp, mtInternal); 1114 errno = ENOTDIR; 1115 return 0; 1116 } 1117 1118 /* Append "*.*", or possibly "\\*.*", to path */ 1119 if (dirp->path[1] == ':' 1120 && (dirp->path[2] == '\0' 1121 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 1122 /* No '\\' needed for cases like "Z:" or "Z:\" */ 1123 strcat(dirp->path, "*.*"); 1124 } else { 1125 strcat(dirp->path, "\\*.*"); 1126 } 1127 1128 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 1129 if (dirp->handle == INVALID_HANDLE_VALUE) { 1130 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 1131 free(dirp->path, mtInternal); 1132 free(dirp, mtInternal); 1133 errno = EACCES; 1134 return 0; 1135 } 1136 } 1137 return dirp; 1138 } 1139 1140 /* parameter dbuf unused on Windows */ 1141 1142 struct dirent * 1143 os::readdir(DIR *dirp, dirent *dbuf) 1144 { 1145 assert(dirp != NULL, "just checking"); // hotspot change 1146 if (dirp->handle == INVALID_HANDLE_VALUE) { 1147 return 0; 1148 } 1149 1150 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 1151 1152 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 1153 if (GetLastError() == ERROR_INVALID_HANDLE) { 1154 errno = EBADF; 1155 return 0; 1156 } 1157 FindClose(dirp->handle); 1158 dirp->handle = INVALID_HANDLE_VALUE; 1159 } 1160 1161 return &dirp->dirent; 1162 } 1163 1164 int 1165 os::closedir(DIR *dirp) 1166 { 1167 assert(dirp != NULL, "just checking"); // hotspot change 1168 if (dirp->handle != INVALID_HANDLE_VALUE) { 1169 if (!FindClose(dirp->handle)) { 1170 errno = EBADF; 1171 return -1; 1172 } 1173 dirp->handle = INVALID_HANDLE_VALUE; 1174 } 1175 free(dirp->path, mtInternal); 1176 free(dirp, mtInternal); 1177 return 0; 1178 } 1179 1180 // This must be hard coded because it's the system's temporary 1181 // directory not the java application's temp directory, ala java.io.tmpdir. 1182 const char* os::get_temp_directory() { 1183 static char path_buf[MAX_PATH]; 1184 if (GetTempPath(MAX_PATH, path_buf)>0) 1185 return path_buf; 1186 else{ 1187 path_buf[0]='\0'; 1188 return path_buf; 1189 } 1190 } 1191 1192 static bool file_exists(const char* filename) { 1193 if (filename == NULL || strlen(filename) == 0) { 1194 return false; 1195 } 1196 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES; 1197 } 1198 1199 bool os::dll_build_name(char *buffer, size_t buflen, 1200 const char* pname, const char* fname) { 1201 bool retval = false; 1202 const size_t pnamelen = pname ? strlen(pname) : 0; 1203 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0; 1204 1205 // Return error on buffer overflow. 1206 if (pnamelen + strlen(fname) + 10 > buflen) { 1207 return retval; 1208 } 1209 1210 if (pnamelen == 0) { 1211 jio_snprintf(buffer, buflen, "%s.dll", fname); 1212 retval = true; 1213 } else if (c == ':' || c == '\\') { 1214 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname); 1215 retval = true; 1216 } else if (strchr(pname, *os::path_separator()) != NULL) { 1217 int n; 1218 char** pelements = split_path(pname, &n); 1219 if (pelements == NULL) { 1220 return false; 1221 } 1222 for (int i = 0; i < n; i++) { 1223 char* path = pelements[i]; 1224 // Really shouldn't be NULL, but check can't hurt 1225 size_t plen = (path == NULL) ? 0 : strlen(path); 1226 if (plen == 0) { 1227 continue; // skip the empty path values 1228 } 1229 const char lastchar = path[plen - 1]; 1230 if (lastchar == ':' || lastchar == '\\') { 1231 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname); 1232 } else { 1233 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname); 1234 } 1235 if (file_exists(buffer)) { 1236 retval = true; 1237 break; 1238 } 1239 } 1240 // release the storage 1241 for (int i = 0; i < n; i++) { 1242 if (pelements[i] != NULL) { 1243 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); 1244 } 1245 } 1246 if (pelements != NULL) { 1247 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); 1248 } 1249 } else { 1250 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname); 1251 retval = true; 1252 } 1253 return retval; 1254 } 1255 1256 // Needs to be in os specific directory because windows requires another 1257 // header file <direct.h> 1258 const char* os::get_current_directory(char *buf, size_t buflen) { 1259 int n = static_cast<int>(buflen); 1260 if (buflen > INT_MAX) n = INT_MAX; 1261 return _getcwd(buf, n); 1262 } 1263 1264 //----------------------------------------------------------- 1265 // Helper functions for fatal error handler 1266 #ifdef _WIN64 1267 // Helper routine which returns true if address in 1268 // within the NTDLL address space. 1269 // 1270 static bool _addr_in_ntdll( address addr ) 1271 { 1272 HMODULE hmod; 1273 MODULEINFO minfo; 1274 1275 hmod = GetModuleHandle("NTDLL.DLL"); 1276 if (hmod == NULL) return false; 1277 if (!os::PSApiDll::GetModuleInformation( GetCurrentProcess(), hmod, 1278 &minfo, sizeof(MODULEINFO)) ) 1279 return false; 1280 1281 if ((addr >= minfo.lpBaseOfDll) && 1282 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) 1283 return true; 1284 else 1285 return false; 1286 } 1287 #endif 1288 1289 1290 // Enumerate all modules for a given process ID 1291 // 1292 // Notice that Windows 95/98/Me and Windows NT/2000/XP have 1293 // different API for doing this. We use PSAPI.DLL on NT based 1294 // Windows and ToolHelp on 95/98/Me. 1295 1296 // Callback function that is called by enumerate_modules() on 1297 // every DLL module. 1298 // Input parameters: 1299 // int pid, 1300 // char* module_file_name, 1301 // address module_base_addr, 1302 // unsigned module_size, 1303 // void* param 1304 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *); 1305 1306 // enumerate_modules for Windows NT, using PSAPI 1307 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param) 1308 { 1309 HANDLE hProcess; 1310 1311 # define MAX_NUM_MODULES 128 1312 HMODULE modules[MAX_NUM_MODULES]; 1313 static char filename[MAX_PATH]; 1314 int result = 0; 1315 1316 if (!os::PSApiDll::PSApiAvailable()) { 1317 return 0; 1318 } 1319 1320 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1321 FALSE, pid); 1322 if (hProcess == NULL) return 0; 1323 1324 DWORD size_needed; 1325 if (!os::PSApiDll::EnumProcessModules(hProcess, modules, 1326 sizeof(modules), &size_needed)) { 1327 CloseHandle(hProcess); 1328 return 0; 1329 } 1330 1331 // number of modules that are currently loaded 1332 int num_modules = size_needed / sizeof(HMODULE); 1333 1334 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1335 // Get Full pathname: 1336 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i], 1337 filename, sizeof(filename))) { 1338 filename[0] = '\0'; 1339 } 1340 1341 MODULEINFO modinfo; 1342 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i], 1343 &modinfo, sizeof(modinfo))) { 1344 modinfo.lpBaseOfDll = NULL; 1345 modinfo.SizeOfImage = 0; 1346 } 1347 1348 // Invoke callback function 1349 result = func(pid, filename, (address)modinfo.lpBaseOfDll, 1350 modinfo.SizeOfImage, param); 1351 if (result) break; 1352 } 1353 1354 CloseHandle(hProcess); 1355 return result; 1356 } 1357 1358 1359 // enumerate_modules for Windows 95/98/ME, using TOOLHELP 1360 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param) 1361 { 1362 HANDLE hSnapShot; 1363 static MODULEENTRY32 modentry; 1364 int result = 0; 1365 1366 if (!os::Kernel32Dll::HelpToolsAvailable()) { 1367 return 0; 1368 } 1369 1370 // Get a handle to a Toolhelp snapshot of the system 1371 hSnapShot = os::Kernel32Dll::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid); 1372 if (hSnapShot == INVALID_HANDLE_VALUE) { 1373 return FALSE; 1374 } 1375 1376 // iterate through all modules 1377 modentry.dwSize = sizeof(MODULEENTRY32); 1378 bool not_done = os::Kernel32Dll::Module32First( hSnapShot, &modentry ) != 0; 1379 1380 while (not_done) { 1381 // invoke the callback 1382 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr, 1383 modentry.modBaseSize, param); 1384 if (result) break; 1385 1386 modentry.dwSize = sizeof(MODULEENTRY32); 1387 not_done = os::Kernel32Dll::Module32Next( hSnapShot, &modentry ) != 0; 1388 } 1389 1390 CloseHandle(hSnapShot); 1391 return result; 1392 } 1393 1394 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param ) 1395 { 1396 // Get current process ID if caller doesn't provide it. 1397 if (!pid) pid = os::current_process_id(); 1398 1399 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param); 1400 else return _enumerate_modules_windows(pid, func, param); 1401 } 1402 1403 struct _modinfo { 1404 address addr; 1405 char* full_path; // point to a char buffer 1406 int buflen; // size of the buffer 1407 address base_addr; 1408 }; 1409 1410 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr, 1411 unsigned size, void * param) { 1412 struct _modinfo *pmod = (struct _modinfo *)param; 1413 if (!pmod) return -1; 1414 1415 if (base_addr <= pmod->addr && 1416 base_addr+size > pmod->addr) { 1417 // if a buffer is provided, copy path name to the buffer 1418 if (pmod->full_path) { 1419 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1420 } 1421 pmod->base_addr = base_addr; 1422 return 1; 1423 } 1424 return 0; 1425 } 1426 1427 bool os::dll_address_to_library_name(address addr, char* buf, 1428 int buflen, int* offset) { 1429 // buf is not optional, but offset is optional 1430 assert(buf != NULL, "sanity check"); 1431 1432 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1433 // return the full path to the DLL file, sometimes it returns path 1434 // to the corresponding PDB file (debug info); sometimes it only 1435 // returns partial path, which makes life painful. 1436 1437 struct _modinfo mi; 1438 mi.addr = addr; 1439 mi.full_path = buf; 1440 mi.buflen = buflen; 1441 int pid = os::current_process_id(); 1442 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) { 1443 // buf already contains path name 1444 if (offset) *offset = addr - mi.base_addr; 1445 return true; 1446 } 1447 1448 buf[0] = '\0'; 1449 if (offset) *offset = -1; 1450 return false; 1451 } 1452 1453 bool os::dll_address_to_function_name(address addr, char *buf, 1454 int buflen, int *offset) { 1455 // buf is not optional, but offset is optional 1456 assert(buf != NULL, "sanity check"); 1457 1458 if (Decoder::decode(addr, buf, buflen, offset)) { 1459 return true; 1460 } 1461 if (offset != NULL) *offset = -1; 1462 buf[0] = '\0'; 1463 return false; 1464 } 1465 1466 // save the start and end address of jvm.dll into param[0] and param[1] 1467 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr, 1468 unsigned size, void * param) { 1469 if (!param) return -1; 1470 1471 if (base_addr <= (address)_locate_jvm_dll && 1472 base_addr+size > (address)_locate_jvm_dll) { 1473 ((address*)param)[0] = base_addr; 1474 ((address*)param)[1] = base_addr + size; 1475 return 1; 1476 } 1477 return 0; 1478 } 1479 1480 address vm_lib_location[2]; // start and end address of jvm.dll 1481 1482 // check if addr is inside jvm.dll 1483 bool os::address_is_in_vm(address addr) { 1484 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1485 int pid = os::current_process_id(); 1486 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) { 1487 assert(false, "Can't find jvm module."); 1488 return false; 1489 } 1490 } 1491 1492 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1493 } 1494 1495 // print module info; param is outputStream* 1496 static int _print_module(int pid, char* fname, address base, 1497 unsigned size, void* param) { 1498 if (!param) return -1; 1499 1500 outputStream* st = (outputStream*)param; 1501 1502 address end_addr = base + size; 1503 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname); 1504 return 0; 1505 } 1506 1507 // Loads .dll/.so and 1508 // in case of error it checks if .dll/.so was built for the 1509 // same architecture as Hotspot is running on 1510 void * os::dll_load(const char *name, char *ebuf, int ebuflen) 1511 { 1512 void * result = LoadLibrary(name); 1513 if (result != NULL) 1514 { 1515 return result; 1516 } 1517 1518 DWORD errcode = GetLastError(); 1519 if (errcode == ERROR_MOD_NOT_FOUND) { 1520 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1); 1521 ebuf[ebuflen-1]='\0'; 1522 return NULL; 1523 } 1524 1525 // Parsing dll below 1526 // If we can read dll-info and find that dll was built 1527 // for an architecture other than Hotspot is running in 1528 // - then print to buffer "DLL was built for a different architecture" 1529 // else call os::lasterror to obtain system error message 1530 1531 // Read system error message into ebuf 1532 // It may or may not be overwritten below (in the for loop and just above) 1533 lasterror(ebuf, (size_t) ebuflen); 1534 ebuf[ebuflen-1]='\0'; 1535 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0); 1536 if (file_descriptor<0) 1537 { 1538 return NULL; 1539 } 1540 1541 uint32_t signature_offset; 1542 uint16_t lib_arch=0; 1543 bool failed_to_get_lib_arch= 1544 ( 1545 //Go to position 3c in the dll 1546 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0) 1547 || 1548 // Read loacation of signature 1549 (sizeof(signature_offset)!= 1550 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset)))) 1551 || 1552 //Go to COFF File Header in dll 1553 //that is located after"signature" (4 bytes long) 1554 (os::seek_to_file_offset(file_descriptor, 1555 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0) 1556 || 1557 //Read field that contains code of architecture 1558 // that dll was build for 1559 (sizeof(lib_arch)!= 1560 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch)))) 1561 ); 1562 1563 ::close(file_descriptor); 1564 if (failed_to_get_lib_arch) 1565 { 1566 // file i/o error - report os::lasterror(...) msg 1567 return NULL; 1568 } 1569 1570 typedef struct 1571 { 1572 uint16_t arch_code; 1573 char* arch_name; 1574 } arch_t; 1575 1576 static const arch_t arch_array[]={ 1577 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1578 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1579 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1580 }; 1581 #if (defined _M_IA64) 1582 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64; 1583 #elif (defined _M_AMD64) 1584 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64; 1585 #elif (defined _M_IX86) 1586 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386; 1587 #else 1588 #error Method os::dll_load requires that one of following \ 1589 is defined :_M_IA64,_M_AMD64 or _M_IX86 1590 #endif 1591 1592 1593 // Obtain a string for printf operation 1594 // lib_arch_str shall contain string what platform this .dll was built for 1595 // running_arch_str shall string contain what platform Hotspot was built for 1596 char *running_arch_str=NULL,*lib_arch_str=NULL; 1597 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++) 1598 { 1599 if (lib_arch==arch_array[i].arch_code) 1600 lib_arch_str=arch_array[i].arch_name; 1601 if (running_arch==arch_array[i].arch_code) 1602 running_arch_str=arch_array[i].arch_name; 1603 } 1604 1605 assert(running_arch_str, 1606 "Didn't find runing architecture code in arch_array"); 1607 1608 // If the architure is right 1609 // but some other error took place - report os::lasterror(...) msg 1610 if (lib_arch == running_arch) 1611 { 1612 return NULL; 1613 } 1614 1615 if (lib_arch_str!=NULL) 1616 { 1617 ::_snprintf(ebuf, ebuflen-1, 1618 "Can't load %s-bit .dll on a %s-bit platform", 1619 lib_arch_str,running_arch_str); 1620 } 1621 else 1622 { 1623 // don't know what architecture this dll was build for 1624 ::_snprintf(ebuf, ebuflen-1, 1625 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1626 lib_arch,running_arch_str); 1627 } 1628 1629 return NULL; 1630 } 1631 1632 1633 void os::print_dll_info(outputStream *st) { 1634 int pid = os::current_process_id(); 1635 st->print_cr("Dynamic libraries:"); 1636 enumerate_modules(pid, _print_module, (void *)st); 1637 } 1638 1639 void os::print_os_info_brief(outputStream* st) { 1640 os::print_os_info(st); 1641 } 1642 1643 void os::print_os_info(outputStream* st) { 1644 st->print("OS:"); 1645 1646 os::win32::print_windows_version(st); 1647 } 1648 1649 void os::win32::print_windows_version(outputStream* st) { 1650 OSVERSIONINFOEX osvi; 1651 SYSTEM_INFO si; 1652 1653 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1654 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1655 1656 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1657 st->print_cr("N/A"); 1658 return; 1659 } 1660 1661 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion; 1662 1663 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1664 if (os_vers >= 5002) { 1665 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1666 // find out whether we are running on 64 bit processor or not. 1667 if (os::Kernel32Dll::GetNativeSystemInfoAvailable()) { 1668 os::Kernel32Dll::GetNativeSystemInfo(&si); 1669 } else { 1670 GetSystemInfo(&si); 1671 } 1672 } 1673 1674 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) { 1675 switch (os_vers) { 1676 case 3051: st->print(" Windows NT 3.51"); break; 1677 case 4000: st->print(" Windows NT 4.0"); break; 1678 case 5000: st->print(" Windows 2000"); break; 1679 case 5001: st->print(" Windows XP"); break; 1680 case 5002: 1681 if (osvi.wProductType == VER_NT_WORKSTATION && 1682 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1683 st->print(" Windows XP x64 Edition"); 1684 } else { 1685 st->print(" Windows Server 2003 family"); 1686 } 1687 break; 1688 1689 case 6000: 1690 if (osvi.wProductType == VER_NT_WORKSTATION) { 1691 st->print(" Windows Vista"); 1692 } else { 1693 st->print(" Windows Server 2008"); 1694 } 1695 break; 1696 1697 case 6001: 1698 if (osvi.wProductType == VER_NT_WORKSTATION) { 1699 st->print(" Windows 7"); 1700 } else { 1701 st->print(" Windows Server 2008 R2"); 1702 } 1703 break; 1704 1705 case 6002: 1706 if (osvi.wProductType == VER_NT_WORKSTATION) { 1707 st->print(" Windows 8"); 1708 } else { 1709 st->print(" Windows Server 2012"); 1710 } 1711 break; 1712 1713 case 6003: 1714 if (osvi.wProductType == VER_NT_WORKSTATION) { 1715 st->print(" Windows 8.1"); 1716 } else { 1717 st->print(" Windows Server 2012 R2"); 1718 } 1719 break; 1720 1721 default: // future os 1722 // Unrecognized windows, print out its major and minor versions 1723 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1724 } 1725 } else { 1726 switch (os_vers) { 1727 case 4000: st->print(" Windows 95"); break; 1728 case 4010: st->print(" Windows 98"); break; 1729 case 4090: st->print(" Windows Me"); break; 1730 default: // future windows, print out its major and minor versions 1731 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1732 } 1733 } 1734 1735 if (os_vers >= 6000 && si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1736 st->print(" , 64 bit"); 1737 } 1738 1739 st->print(" Build %d", osvi.dwBuildNumber); 1740 st->print(" %s", osvi.szCSDVersion); // service pack 1741 st->cr(); 1742 } 1743 1744 void os::pd_print_cpu_info(outputStream* st) { 1745 // Nothing to do for now. 1746 } 1747 1748 void os::print_memory_info(outputStream* st) { 1749 st->print("Memory:"); 1750 st->print(" %dk page", os::vm_page_size()>>10); 1751 1752 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1753 // value if total memory is larger than 4GB 1754 MEMORYSTATUSEX ms; 1755 ms.dwLength = sizeof(ms); 1756 GlobalMemoryStatusEx(&ms); 1757 1758 st->print(", physical %uk", os::physical_memory() >> 10); 1759 st->print("(%uk free)", os::available_memory() >> 10); 1760 1761 st->print(", swap %uk", ms.ullTotalPageFile >> 10); 1762 st->print("(%uk free)", ms.ullAvailPageFile >> 10); 1763 st->cr(); 1764 } 1765 1766 void os::print_siginfo(outputStream *st, void *siginfo) { 1767 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1768 st->print("siginfo:"); 1769 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1770 1771 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1772 er->NumberParameters >= 2) { 1773 switch (er->ExceptionInformation[0]) { 1774 case 0: st->print(", reading address"); break; 1775 case 1: st->print(", writing address"); break; 1776 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1777 er->ExceptionInformation[0]); 1778 } 1779 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1780 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1781 er->NumberParameters >= 2 && UseSharedSpaces) { 1782 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1783 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1784 st->print("\n\nError accessing class data sharing archive." \ 1785 " Mapped file inaccessible during execution, " \ 1786 " possible disk/network problem."); 1787 } 1788 } else { 1789 int num = er->NumberParameters; 1790 if (num > 0) { 1791 st->print(", ExceptionInformation="); 1792 for (int i = 0; i < num; i++) { 1793 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1794 } 1795 } 1796 } 1797 st->cr(); 1798 } 1799 1800 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1801 // do nothing 1802 } 1803 1804 static char saved_jvm_path[MAX_PATH] = {0}; 1805 1806 // Find the full path to the current module, jvm.dll 1807 void os::jvm_path(char *buf, jint buflen) { 1808 // Error checking. 1809 if (buflen < MAX_PATH) { 1810 assert(false, "must use a large-enough buffer"); 1811 buf[0] = '\0'; 1812 return; 1813 } 1814 // Lazy resolve the path to current module. 1815 if (saved_jvm_path[0] != 0) { 1816 strcpy(buf, saved_jvm_path); 1817 return; 1818 } 1819 1820 buf[0] = '\0'; 1821 if (Arguments::sun_java_launcher_is_altjvm()) { 1822 // Support for the java launcher's '-XXaltjvm=<path>' option. Check 1823 // for a JAVA_HOME environment variable and fix up the path so it 1824 // looks like jvm.dll is installed there (append a fake suffix 1825 // hotspot/jvm.dll). 1826 char* java_home_var = ::getenv("JAVA_HOME"); 1827 if (java_home_var != NULL && java_home_var[0] != 0) { 1828 strncpy(buf, java_home_var, buflen); 1829 1830 // determine if this is a legacy image or modules image 1831 // modules image doesn't have "jre" subdirectory 1832 size_t len = strlen(buf); 1833 char* jrebin_p = buf + len; 1834 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1835 if (0 != _access(buf, 0)) { 1836 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1837 } 1838 len = strlen(buf); 1839 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1840 } 1841 } 1842 1843 if (buf[0] == '\0') { 1844 GetModuleFileName(vm_lib_handle, buf, buflen); 1845 } 1846 strcpy(saved_jvm_path, buf); 1847 } 1848 1849 1850 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1851 #ifndef _WIN64 1852 st->print("_"); 1853 #endif 1854 } 1855 1856 1857 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1858 #ifndef _WIN64 1859 st->print("@%d", args_size * sizeof(int)); 1860 #endif 1861 } 1862 1863 // This method is a copy of JDK's sysGetLastErrorString 1864 // from src/windows/hpi/src/system_md.c 1865 1866 size_t os::lasterror(char* buf, size_t len) { 1867 DWORD errval; 1868 1869 if ((errval = GetLastError()) != 0) { 1870 // DOS error 1871 size_t n = (size_t)FormatMessage( 1872 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1873 NULL, 1874 errval, 1875 0, 1876 buf, 1877 (DWORD)len, 1878 NULL); 1879 if (n > 3) { 1880 // Drop final '.', CR, LF 1881 if (buf[n - 1] == '\n') n--; 1882 if (buf[n - 1] == '\r') n--; 1883 if (buf[n - 1] == '.') n--; 1884 buf[n] = '\0'; 1885 } 1886 return n; 1887 } 1888 1889 if (errno != 0) { 1890 // C runtime error that has no corresponding DOS error code 1891 const char* s = strerror(errno); 1892 size_t n = strlen(s); 1893 if (n >= len) n = len - 1; 1894 strncpy(buf, s, n); 1895 buf[n] = '\0'; 1896 return n; 1897 } 1898 1899 return 0; 1900 } 1901 1902 int os::get_last_error() { 1903 DWORD error = GetLastError(); 1904 if (error == 0) 1905 error = errno; 1906 return (int)error; 1907 } 1908 1909 // sun.misc.Signal 1910 // NOTE that this is a workaround for an apparent kernel bug where if 1911 // a signal handler for SIGBREAK is installed then that signal handler 1912 // takes priority over the console control handler for CTRL_CLOSE_EVENT. 1913 // See bug 4416763. 1914 static void (*sigbreakHandler)(int) = NULL; 1915 1916 static void UserHandler(int sig, void *siginfo, void *context) { 1917 os::signal_notify(sig); 1918 // We need to reinstate the signal handler each time... 1919 os::signal(sig, (void*)UserHandler); 1920 } 1921 1922 void* os::user_handler() { 1923 return (void*) UserHandler; 1924 } 1925 1926 void* os::signal(int signal_number, void* handler) { 1927 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1928 void (*oldHandler)(int) = sigbreakHandler; 1929 sigbreakHandler = (void (*)(int)) handler; 1930 return (void*) oldHandler; 1931 } else { 1932 return (void*)::signal(signal_number, (void (*)(int))handler); 1933 } 1934 } 1935 1936 void os::signal_raise(int signal_number) { 1937 raise(signal_number); 1938 } 1939 1940 // The Win32 C runtime library maps all console control events other than ^C 1941 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1942 // logoff, and shutdown events. We therefore install our own console handler 1943 // that raises SIGTERM for the latter cases. 1944 // 1945 static BOOL WINAPI consoleHandler(DWORD event) { 1946 switch (event) { 1947 case CTRL_C_EVENT: 1948 if (is_error_reported()) { 1949 // Ctrl-C is pressed during error reporting, likely because the error 1950 // handler fails to abort. Let VM die immediately. 1951 os::die(); 1952 } 1953 1954 os::signal_raise(SIGINT); 1955 return TRUE; 1956 break; 1957 case CTRL_BREAK_EVENT: 1958 if (sigbreakHandler != NULL) { 1959 (*sigbreakHandler)(SIGBREAK); 1960 } 1961 return TRUE; 1962 break; 1963 case CTRL_LOGOFF_EVENT: { 1964 // Don't terminate JVM if it is running in a non-interactive session, 1965 // such as a service process. 1966 USEROBJECTFLAGS flags; 1967 HANDLE handle = GetProcessWindowStation(); 1968 if (handle != NULL && 1969 GetUserObjectInformation(handle, UOI_FLAGS, &flags, 1970 sizeof(USEROBJECTFLAGS), NULL)) { 1971 // If it is a non-interactive session, let next handler to deal 1972 // with it. 1973 if ((flags.dwFlags & WSF_VISIBLE) == 0) { 1974 return FALSE; 1975 } 1976 } 1977 } 1978 case CTRL_CLOSE_EVENT: 1979 case CTRL_SHUTDOWN_EVENT: 1980 os::signal_raise(SIGTERM); 1981 return TRUE; 1982 break; 1983 default: 1984 break; 1985 } 1986 return FALSE; 1987 } 1988 1989 /* 1990 * The following code is moved from os.cpp for making this 1991 * code platform specific, which it is by its very nature. 1992 */ 1993 1994 // Return maximum OS signal used + 1 for internal use only 1995 // Used as exit signal for signal_thread 1996 int os::sigexitnum_pd() { 1997 return NSIG; 1998 } 1999 2000 // a counter for each possible signal value, including signal_thread exit signal 2001 static volatile jint pending_signals[NSIG+1] = { 0 }; 2002 static HANDLE sig_sem = NULL; 2003 2004 void os::signal_init_pd() { 2005 // Initialize signal structures 2006 memset((void*)pending_signals, 0, sizeof(pending_signals)); 2007 2008 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 2009 2010 // Programs embedding the VM do not want it to attempt to receive 2011 // events like CTRL_LOGOFF_EVENT, which are used to implement the 2012 // shutdown hooks mechanism introduced in 1.3. For example, when 2013 // the VM is run as part of a Windows NT service (i.e., a servlet 2014 // engine in a web server), the correct behavior is for any console 2015 // control handler to return FALSE, not TRUE, because the OS's 2016 // "final" handler for such events allows the process to continue if 2017 // it is a service (while terminating it if it is not a service). 2018 // To make this behavior uniform and the mechanism simpler, we 2019 // completely disable the VM's usage of these console events if -Xrs 2020 // (=ReduceSignalUsage) is specified. This means, for example, that 2021 // the CTRL-BREAK thread dump mechanism is also disabled in this 2022 // case. See bugs 4323062, 4345157, and related bugs. 2023 2024 if (!ReduceSignalUsage) { 2025 // Add a CTRL-C handler 2026 SetConsoleCtrlHandler(consoleHandler, TRUE); 2027 } 2028 } 2029 2030 void os::signal_notify(int signal_number) { 2031 BOOL ret; 2032 if (sig_sem != NULL) { 2033 Atomic::inc(&pending_signals[signal_number]); 2034 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2035 assert(ret != 0, "ReleaseSemaphore() failed"); 2036 } 2037 } 2038 2039 static int check_pending_signals(bool wait_for_signal) { 2040 DWORD ret; 2041 while (true) { 2042 for (int i = 0; i < NSIG + 1; i++) { 2043 jint n = pending_signals[i]; 2044 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2045 return i; 2046 } 2047 } 2048 if (!wait_for_signal) { 2049 return -1; 2050 } 2051 2052 JavaThread *thread = JavaThread::current(); 2053 2054 ThreadBlockInVM tbivm(thread); 2055 2056 bool threadIsSuspended; 2057 do { 2058 thread->set_suspend_equivalent(); 2059 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2060 ret = ::WaitForSingleObject(sig_sem, INFINITE); 2061 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 2062 2063 // were we externally suspended while we were waiting? 2064 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2065 if (threadIsSuspended) { 2066 // 2067 // The semaphore has been incremented, but while we were waiting 2068 // another thread suspended us. We don't want to continue running 2069 // while suspended because that would surprise the thread that 2070 // suspended us. 2071 // 2072 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2073 assert(ret != 0, "ReleaseSemaphore() failed"); 2074 2075 thread->java_suspend_self(); 2076 } 2077 } while (threadIsSuspended); 2078 } 2079 } 2080 2081 int os::signal_lookup() { 2082 return check_pending_signals(false); 2083 } 2084 2085 int os::signal_wait() { 2086 return check_pending_signals(true); 2087 } 2088 2089 // Implicit OS exception handling 2090 2091 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) { 2092 JavaThread* thread = JavaThread::current(); 2093 // Save pc in thread 2094 #ifdef _M_IA64 2095 // Do not blow up if no thread info available. 2096 if (thread) { 2097 // Saving PRECISE pc (with slot information) in thread. 2098 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress; 2099 // Convert precise PC into "Unix" format 2100 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2); 2101 thread->set_saved_exception_pc((address)precise_pc); 2102 } 2103 // Set pc to handler 2104 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 2105 // Clear out psr.ri (= Restart Instruction) in order to continue 2106 // at the beginning of the target bundle. 2107 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF; 2108 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!"); 2109 #elif _M_AMD64 2110 // Do not blow up if no thread info available. 2111 if (thread) { 2112 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip); 2113 } 2114 // Set pc to handler 2115 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 2116 #else 2117 // Do not blow up if no thread info available. 2118 if (thread) { 2119 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip); 2120 } 2121 // Set pc to handler 2122 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler; 2123 #endif 2124 2125 // Continue the execution 2126 return EXCEPTION_CONTINUE_EXECUTION; 2127 } 2128 2129 2130 // Used for PostMortemDump 2131 extern "C" void safepoints(); 2132 extern "C" void find(int x); 2133 extern "C" void events(); 2134 2135 // According to Windows API documentation, an illegal instruction sequence should generate 2136 // the 0xC000001C exception code. However, real world experience shows that occasionnaly 2137 // the execution of an illegal instruction can generate the exception code 0xC000001E. This 2138 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 2139 2140 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 2141 2142 // From "Execution Protection in the Windows Operating System" draft 0.35 2143 // Once a system header becomes available, the "real" define should be 2144 // included or copied here. 2145 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2146 2147 // Handle NAT Bit consumption on IA64. 2148 #ifdef _M_IA64 2149 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION 2150 #endif 2151 2152 // Windows Vista/2008 heap corruption check 2153 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374 2154 2155 #define def_excpt(val) #val, val 2156 2157 struct siglabel { 2158 char *name; 2159 int number; 2160 }; 2161 2162 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual 2163 // C++ compiler contain this error code. Because this is a compiler-generated 2164 // error, the code is not listed in the Win32 API header files. 2165 // The code is actually a cryptic mnemonic device, with the initial "E" 2166 // standing for "exception" and the final 3 bytes (0x6D7363) representing the 2167 // ASCII values of "msc". 2168 2169 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363 2170 2171 2172 struct siglabel exceptlabels[] = { 2173 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2174 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2175 def_excpt(EXCEPTION_BREAKPOINT), 2176 def_excpt(EXCEPTION_SINGLE_STEP), 2177 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2178 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2179 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2180 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2181 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2182 def_excpt(EXCEPTION_FLT_OVERFLOW), 2183 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2184 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2185 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2186 def_excpt(EXCEPTION_INT_OVERFLOW), 2187 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2188 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2189 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2190 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2191 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2192 def_excpt(EXCEPTION_STACK_OVERFLOW), 2193 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2194 def_excpt(EXCEPTION_GUARD_PAGE), 2195 def_excpt(EXCEPTION_INVALID_HANDLE), 2196 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION), 2197 def_excpt(EXCEPTION_HEAP_CORRUPTION), 2198 #ifdef _M_IA64 2199 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION), 2200 #endif 2201 NULL, 0 2202 }; 2203 2204 const char* os::exception_name(int exception_code, char *buf, size_t size) { 2205 for (int i = 0; exceptlabels[i].name != NULL; i++) { 2206 if (exceptlabels[i].number == exception_code) { 2207 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2208 return buf; 2209 } 2210 } 2211 2212 return NULL; 2213 } 2214 2215 //----------------------------------------------------------------------------- 2216 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2217 // handle exception caused by idiv; should only happen for -MinInt/-1 2218 // (division by zero is handled explicitly) 2219 #ifdef _M_IA64 2220 assert(0, "Fix Handle_IDiv_Exception"); 2221 #elif _M_AMD64 2222 PCONTEXT ctx = exceptionInfo->ContextRecord; 2223 address pc = (address)ctx->Rip; 2224 assert(pc[0] == 0xF7, "not an idiv opcode"); 2225 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2226 assert(ctx->Rax == min_jint, "unexpected idiv exception"); 2227 // set correct result values and continue after idiv instruction 2228 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2229 ctx->Rax = (DWORD)min_jint; // result 2230 ctx->Rdx = (DWORD)0; // remainder 2231 // Continue the execution 2232 #else 2233 PCONTEXT ctx = exceptionInfo->ContextRecord; 2234 address pc = (address)ctx->Eip; 2235 assert(pc[0] == 0xF7, "not an idiv opcode"); 2236 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2237 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2238 // set correct result values and continue after idiv instruction 2239 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2240 ctx->Eax = (DWORD)min_jint; // result 2241 ctx->Edx = (DWORD)0; // remainder 2242 // Continue the execution 2243 #endif 2244 return EXCEPTION_CONTINUE_EXECUTION; 2245 } 2246 2247 //----------------------------------------------------------------------------- 2248 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2249 PCONTEXT ctx = exceptionInfo->ContextRecord; 2250 #ifndef _WIN64 2251 // handle exception caused by native method modifying control word 2252 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2253 2254 switch (exception_code) { 2255 case EXCEPTION_FLT_DENORMAL_OPERAND: 2256 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2257 case EXCEPTION_FLT_INEXACT_RESULT: 2258 case EXCEPTION_FLT_INVALID_OPERATION: 2259 case EXCEPTION_FLT_OVERFLOW: 2260 case EXCEPTION_FLT_STACK_CHECK: 2261 case EXCEPTION_FLT_UNDERFLOW: 2262 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2263 if (fp_control_word != ctx->FloatSave.ControlWord) { 2264 // Restore FPCW and mask out FLT exceptions 2265 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2266 // Mask out pending FLT exceptions 2267 ctx->FloatSave.StatusWord &= 0xffffff00; 2268 return EXCEPTION_CONTINUE_EXECUTION; 2269 } 2270 } 2271 2272 if (prev_uef_handler != NULL) { 2273 // We didn't handle this exception so pass it to the previous 2274 // UnhandledExceptionFilter. 2275 return (prev_uef_handler)(exceptionInfo); 2276 } 2277 #else // !_WIN64 2278 /* 2279 On Windows, the mxcsr control bits are non-volatile across calls 2280 See also CR 6192333 2281 */ 2282 jint MxCsr = INITIAL_MXCSR; 2283 // we can't use StubRoutines::addr_mxcsr_std() 2284 // because in Win64 mxcsr is not saved there 2285 if (MxCsr != ctx->MxCsr) { 2286 ctx->MxCsr = MxCsr; 2287 return EXCEPTION_CONTINUE_EXECUTION; 2288 } 2289 #endif // !_WIN64 2290 2291 return EXCEPTION_CONTINUE_SEARCH; 2292 } 2293 2294 // Fatal error reporting is single threaded so we can make this a 2295 // static and preallocated. If it's more than MAX_PATH silently ignore 2296 // it. 2297 static char saved_error_file[MAX_PATH] = {0}; 2298 2299 void os::set_error_file(const char *logfile) { 2300 if (strlen(logfile) <= MAX_PATH) { 2301 strncpy(saved_error_file, logfile, MAX_PATH); 2302 } 2303 } 2304 2305 static inline void report_error(Thread* t, DWORD exception_code, 2306 address addr, void* siginfo, void* context) { 2307 VMError err(t, exception_code, addr, siginfo, context); 2308 err.report_and_die(); 2309 2310 // If UseOsErrorReporting, this will return here and save the error file 2311 // somewhere where we can find it in the minidump. 2312 } 2313 2314 //----------------------------------------------------------------------------- 2315 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2316 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2317 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2318 #ifdef _M_IA64 2319 // On Itanium, we need the "precise pc", which has the slot number coded 2320 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format). 2321 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress; 2322 // Convert the pc to "Unix format", which has the slot number coded 2323 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2 2324 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction" 2325 // information is saved in the Unix format. 2326 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2)); 2327 #elif _M_AMD64 2328 address pc = (address) exceptionInfo->ContextRecord->Rip; 2329 #else 2330 address pc = (address) exceptionInfo->ContextRecord->Eip; 2331 #endif 2332 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 2333 2334 // Handle SafeFetch32 and SafeFetchN exceptions. 2335 if (StubRoutines::is_safefetch_fault(pc)) { 2336 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc)); 2337 } 2338 2339 #ifndef _WIN64 2340 // Execution protection violation - win32 running on AMD64 only 2341 // Handled first to avoid misdiagnosis as a "normal" access violation; 2342 // This is safe to do because we have a new/unique ExceptionInformation 2343 // code for this condition. 2344 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2345 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2346 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2347 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2348 2349 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2350 int page_size = os::vm_page_size(); 2351 2352 // Make sure the pc and the faulting address are sane. 2353 // 2354 // If an instruction spans a page boundary, and the page containing 2355 // the beginning of the instruction is executable but the following 2356 // page is not, the pc and the faulting address might be slightly 2357 // different - we still want to unguard the 2nd page in this case. 2358 // 2359 // 15 bytes seems to be a (very) safe value for max instruction size. 2360 bool pc_is_near_addr = 2361 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2362 bool instr_spans_page_boundary = 2363 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2364 (intptr_t) page_size) > 0); 2365 2366 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2367 static volatile address last_addr = 2368 (address) os::non_memory_address_word(); 2369 2370 // In conservative mode, don't unguard unless the address is in the VM 2371 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2372 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2373 2374 // Set memory to RWX and retry 2375 address page_start = 2376 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2377 bool res = os::protect_memory((char*) page_start, page_size, 2378 os::MEM_PROT_RWX); 2379 2380 if (PrintMiscellaneous && Verbose) { 2381 char buf[256]; 2382 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 2383 "at " INTPTR_FORMAT 2384 ", unguarding " INTPTR_FORMAT ": %s", addr, 2385 page_start, (res ? "success" : strerror(errno))); 2386 tty->print_raw_cr(buf); 2387 } 2388 2389 // Set last_addr so if we fault again at the same address, we don't 2390 // end up in an endless loop. 2391 // 2392 // There are two potential complications here. Two threads trapping 2393 // at the same address at the same time could cause one of the 2394 // threads to think it already unguarded, and abort the VM. Likely 2395 // very rare. 2396 // 2397 // The other race involves two threads alternately trapping at 2398 // different addresses and failing to unguard the page, resulting in 2399 // an endless loop. This condition is probably even more unlikely 2400 // than the first. 2401 // 2402 // Although both cases could be avoided by using locks or thread 2403 // local last_addr, these solutions are unnecessary complication: 2404 // this handler is a best-effort safety net, not a complete solution. 2405 // It is disabled by default and should only be used as a workaround 2406 // in case we missed any no-execute-unsafe VM code. 2407 2408 last_addr = addr; 2409 2410 return EXCEPTION_CONTINUE_EXECUTION; 2411 } 2412 } 2413 2414 // Last unguard failed or not unguarding 2415 tty->print_raw_cr("Execution protection violation"); 2416 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2417 exceptionInfo->ContextRecord); 2418 return EXCEPTION_CONTINUE_SEARCH; 2419 } 2420 } 2421 #endif // _WIN64 2422 2423 // Check to see if we caught the safepoint code in the 2424 // process of write protecting the memory serialization page. 2425 // It write enables the page immediately after protecting it 2426 // so just return. 2427 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2428 JavaThread* thread = (JavaThread*) t; 2429 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2430 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2431 if (os::is_memory_serialize_page(thread, addr)) { 2432 // Block current thread until the memory serialize page permission restored. 2433 os::block_on_serialize_page_trap(); 2434 return EXCEPTION_CONTINUE_EXECUTION; 2435 } 2436 } 2437 2438 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) && 2439 VM_Version::is_cpuinfo_segv_addr(pc)) { 2440 // Verify that OS save/restore AVX registers. 2441 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr()); 2442 } 2443 2444 if (t != NULL && t->is_Java_thread()) { 2445 JavaThread* thread = (JavaThread*) t; 2446 bool in_java = thread->thread_state() == _thread_in_Java; 2447 2448 // Handle potential stack overflows up front. 2449 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2450 if (os::uses_stack_guard_pages()) { 2451 #ifdef _M_IA64 2452 // Use guard page for register stack. 2453 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2454 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2455 // Check for a register stack overflow on Itanium 2456 if (thread->addr_inside_register_stack_red_zone(addr)) { 2457 // Fatal red zone violation happens if the Java program 2458 // catches a StackOverflow error and does so much processing 2459 // that it runs beyond the unprotected yellow guard zone. As 2460 // a result, we are out of here. 2461 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit."); 2462 } else if(thread->addr_inside_register_stack(addr)) { 2463 // Disable the yellow zone which sets the state that 2464 // we've got a stack overflow problem. 2465 if (thread->stack_yellow_zone_enabled()) { 2466 thread->disable_stack_yellow_zone(); 2467 } 2468 // Give us some room to process the exception. 2469 thread->disable_register_stack_guard(); 2470 // Tracing with +Verbose. 2471 if (Verbose) { 2472 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc); 2473 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr); 2474 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base()); 2475 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]", 2476 thread->register_stack_base(), 2477 thread->register_stack_base() + thread->stack_size()); 2478 } 2479 2480 // Reguard the permanent register stack red zone just to be sure. 2481 // We saw Windows silently disabling this without telling us. 2482 thread->enable_register_stack_red_zone(); 2483 2484 return Handle_Exception(exceptionInfo, 2485 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2486 } 2487 #endif 2488 if (thread->stack_yellow_zone_enabled()) { 2489 // Yellow zone violation. The o/s has unprotected the first yellow 2490 // zone page for us. Note: must call disable_stack_yellow_zone to 2491 // update the enabled status, even if the zone contains only one page. 2492 thread->disable_stack_yellow_zone(); 2493 // If not in java code, return and hope for the best. 2494 return in_java ? Handle_Exception(exceptionInfo, 2495 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2496 : EXCEPTION_CONTINUE_EXECUTION; 2497 } else { 2498 // Fatal red zone violation. 2499 thread->disable_stack_red_zone(); 2500 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2501 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2502 exceptionInfo->ContextRecord); 2503 return EXCEPTION_CONTINUE_SEARCH; 2504 } 2505 } else if (in_java) { 2506 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2507 // a one-time-only guard page, which it has released to us. The next 2508 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2509 return Handle_Exception(exceptionInfo, 2510 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2511 } else { 2512 // Can only return and hope for the best. Further stack growth will 2513 // result in an ACCESS_VIOLATION. 2514 return EXCEPTION_CONTINUE_EXECUTION; 2515 } 2516 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2517 // Either stack overflow or null pointer exception. 2518 if (in_java) { 2519 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2520 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2521 address stack_end = thread->stack_base() - thread->stack_size(); 2522 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2523 // Stack overflow. 2524 assert(!os::uses_stack_guard_pages(), 2525 "should be caught by red zone code above."); 2526 return Handle_Exception(exceptionInfo, 2527 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2528 } 2529 // 2530 // Check for safepoint polling and implicit null 2531 // We only expect null pointers in the stubs (vtable) 2532 // the rest are checked explicitly now. 2533 // 2534 CodeBlob* cb = CodeCache::find_blob(pc); 2535 if (cb != NULL) { 2536 if (os::is_poll_address(addr)) { 2537 address stub = SharedRuntime::get_poll_stub(pc); 2538 return Handle_Exception(exceptionInfo, stub); 2539 } 2540 } 2541 { 2542 #ifdef _WIN64 2543 // 2544 // If it's a legal stack address map the entire region in 2545 // 2546 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2547 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2548 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) { 2549 addr = (address)((uintptr_t)addr & 2550 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2551 os::commit_memory((char *)addr, thread->stack_base() - addr, 2552 !ExecMem); 2553 return EXCEPTION_CONTINUE_EXECUTION; 2554 } 2555 else 2556 #endif 2557 { 2558 // Null pointer exception. 2559 #ifdef _M_IA64 2560 // Process implicit null checks in compiled code. Note: Implicit null checks 2561 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs. 2562 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) { 2563 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format); 2564 // Handle implicit null check in UEP method entry 2565 if (cb && (cb->is_frame_complete_at(pc) || 2566 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) { 2567 if (Verbose) { 2568 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0); 2569 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format); 2570 tty->print_cr(" to addr " INTPTR_FORMAT, addr); 2571 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)", 2572 *(bundle_start + 1), *bundle_start); 2573 } 2574 return Handle_Exception(exceptionInfo, 2575 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL)); 2576 } 2577 } 2578 2579 // Implicit null checks were processed above. Hence, we should not reach 2580 // here in the usual case => die! 2581 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception"); 2582 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2583 exceptionInfo->ContextRecord); 2584 return EXCEPTION_CONTINUE_SEARCH; 2585 2586 #else // !IA64 2587 2588 // Windows 98 reports faulting addresses incorrectly 2589 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2590 !os::win32::is_nt()) { 2591 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2592 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2593 } 2594 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2595 exceptionInfo->ContextRecord); 2596 return EXCEPTION_CONTINUE_SEARCH; 2597 #endif 2598 } 2599 } 2600 } 2601 2602 #ifdef _WIN64 2603 // Special care for fast JNI field accessors. 2604 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2605 // in and the heap gets shrunk before the field access. 2606 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2607 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2608 if (addr != (address)-1) { 2609 return Handle_Exception(exceptionInfo, addr); 2610 } 2611 } 2612 #endif 2613 2614 // Stack overflow or null pointer exception in native code. 2615 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2616 exceptionInfo->ContextRecord); 2617 return EXCEPTION_CONTINUE_SEARCH; 2618 } // /EXCEPTION_ACCESS_VIOLATION 2619 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2620 #if defined _M_IA64 2621 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION || 2622 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) { 2623 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0); 2624 2625 // Compiled method patched to be non entrant? Following conditions must apply: 2626 // 1. must be first instruction in bundle 2627 // 2. must be a break instruction with appropriate code 2628 if ((((uint64_t) pc & 0x0F) == 0) && 2629 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) { 2630 return Handle_Exception(exceptionInfo, 2631 (address)SharedRuntime::get_handle_wrong_method_stub()); 2632 } 2633 } // /EXCEPTION_ILLEGAL_INSTRUCTION 2634 #endif 2635 2636 2637 if (in_java) { 2638 switch (exception_code) { 2639 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2640 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2641 2642 case EXCEPTION_INT_OVERFLOW: 2643 return Handle_IDiv_Exception(exceptionInfo); 2644 2645 } // switch 2646 } 2647 if (((thread->thread_state() == _thread_in_Java) || 2648 (thread->thread_state() == _thread_in_native)) && 2649 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) 2650 { 2651 LONG result=Handle_FLT_Exception(exceptionInfo); 2652 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2653 } 2654 } 2655 2656 if (exception_code != EXCEPTION_BREAKPOINT) { 2657 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2658 exceptionInfo->ContextRecord); 2659 } 2660 return EXCEPTION_CONTINUE_SEARCH; 2661 } 2662 2663 #ifndef _WIN64 2664 // Special care for fast JNI accessors. 2665 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2666 // the heap gets shrunk before the field access. 2667 // Need to install our own structured exception handler since native code may 2668 // install its own. 2669 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2670 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2671 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2672 address pc = (address) exceptionInfo->ContextRecord->Eip; 2673 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2674 if (addr != (address)-1) { 2675 return Handle_Exception(exceptionInfo, addr); 2676 } 2677 } 2678 return EXCEPTION_CONTINUE_SEARCH; 2679 } 2680 2681 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \ 2682 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \ 2683 __try { \ 2684 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \ 2685 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \ 2686 } \ 2687 return 0; \ 2688 } 2689 2690 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2691 DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2692 DEFINE_FAST_GETFIELD(jchar, char, Char) 2693 DEFINE_FAST_GETFIELD(jshort, short, Short) 2694 DEFINE_FAST_GETFIELD(jint, int, Int) 2695 DEFINE_FAST_GETFIELD(jlong, long, Long) 2696 DEFINE_FAST_GETFIELD(jfloat, float, Float) 2697 DEFINE_FAST_GETFIELD(jdouble, double, Double) 2698 2699 address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2700 switch (type) { 2701 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2702 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2703 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2704 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2705 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2706 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2707 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2708 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2709 default: ShouldNotReachHere(); 2710 } 2711 return (address)-1; 2712 } 2713 #endif 2714 2715 void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) { 2716 // Install a win32 structured exception handler around the test 2717 // function call so the VM can generate an error dump if needed. 2718 __try { 2719 (*funcPtr)(); 2720 } __except(topLevelExceptionFilter( 2721 (_EXCEPTION_POINTERS*)_exception_info())) { 2722 // Nothing to do. 2723 } 2724 } 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, size_t alignment, char* addr, bool exec) { 3160 assert(UseLargePages, "only for large pages"); 3161 3162 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { 3163 return NULL; // Fallback to small pages. 3164 } 3165 3166 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 3167 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3168 3169 // with large pages, there are two cases where we need to use Individual Allocation 3170 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003) 3171 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page 3172 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) { 3173 if (TracePageSizes && Verbose) { 3174 tty->print_cr("Reserving large pages individually."); 3175 } 3176 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError); 3177 if (p_buf == NULL) { 3178 // give an appropriate warning message 3179 if (UseNUMAInterleaving) { 3180 warning("NUMA large page allocation failed, UseLargePages flag ignored"); 3181 } 3182 if (UseLargePagesIndividualAllocation) { 3183 warning("Individually allocated large pages failed, " 3184 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 3185 } 3186 return NULL; 3187 } 3188 3189 return p_buf; 3190 3191 } else { 3192 if (TracePageSizes && Verbose) { 3193 tty->print_cr("Reserving large pages in a single large chunk."); 3194 } 3195 // normal policy just allocate it all at once 3196 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3197 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); 3198 if (res != NULL) { 3199 address pc = CALLER_PC; 3200 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, mtNone, pc); 3201 } 3202 3203 return res; 3204 } 3205 } 3206 3207 bool os::release_memory_special(char* base, size_t bytes) { 3208 assert(base != NULL, "Sanity check"); 3209 return release_memory(base, bytes); 3210 } 3211 3212 void os::print_statistics() { 3213 } 3214 3215 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) { 3216 int err = os::get_last_error(); 3217 char buf[256]; 3218 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3219 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 3220 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3221 exec, buf_len != 0 ? buf : "<no_error_string>", err); 3222 } 3223 3224 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 3225 if (bytes == 0) { 3226 // Don't bother the OS with noops. 3227 return true; 3228 } 3229 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 3230 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 3231 // Don't attempt to print anything if the OS call fails. We're 3232 // probably low on resources, so the print itself may cause crashes. 3233 3234 // unless we have NUMAInterleaving enabled, the range of a commit 3235 // is always within a reserve covered by a single VirtualAlloc 3236 // in that case we can just do a single commit for the requested size 3237 if (!UseNUMAInterleaving) { 3238 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) { 3239 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3240 return false; 3241 } 3242 if (exec) { 3243 DWORD oldprot; 3244 // Windows doc says to use VirtualProtect to get execute permissions 3245 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) { 3246 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3247 return false; 3248 } 3249 } 3250 return true; 3251 } else { 3252 3253 // when NUMAInterleaving is enabled, the commit might cover a range that 3254 // came from multiple VirtualAlloc reserves (using allocate_pages_individually). 3255 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery 3256 // returns represents the number of bytes that can be committed in one step. 3257 size_t bytes_remaining = bytes; 3258 char * next_alloc_addr = addr; 3259 while (bytes_remaining > 0) { 3260 MEMORY_BASIC_INFORMATION alloc_info; 3261 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info)); 3262 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3263 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, 3264 PAGE_READWRITE) == NULL) { 3265 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3266 exec);) 3267 return false; 3268 } 3269 if (exec) { 3270 DWORD oldprot; 3271 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, 3272 PAGE_EXECUTE_READWRITE, &oldprot)) { 3273 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3274 exec);) 3275 return false; 3276 } 3277 } 3278 bytes_remaining -= bytes_to_rq; 3279 next_alloc_addr += bytes_to_rq; 3280 } 3281 } 3282 // if we made it this far, return true 3283 return true; 3284 } 3285 3286 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 3287 bool exec) { 3288 // alignment_hint is ignored on this OS 3289 return pd_commit_memory(addr, size, exec); 3290 } 3291 3292 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 3293 const char* mesg) { 3294 assert(mesg != NULL, "mesg must be specified"); 3295 if (!pd_commit_memory(addr, size, exec)) { 3296 warn_fail_commit_memory(addr, size, exec); 3297 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); 3298 } 3299 } 3300 3301 void os::pd_commit_memory_or_exit(char* addr, size_t size, 3302 size_t alignment_hint, bool exec, 3303 const char* mesg) { 3304 // alignment_hint is ignored on this OS 3305 pd_commit_memory_or_exit(addr, size, exec, mesg); 3306 } 3307 3308 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3309 if (bytes == 0) { 3310 // Don't bother the OS with noops. 3311 return true; 3312 } 3313 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 3314 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 3315 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0); 3316 } 3317 3318 bool os::pd_release_memory(char* addr, size_t bytes) { 3319 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 3320 } 3321 3322 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 3323 return os::commit_memory(addr, size, !ExecMem); 3324 } 3325 3326 bool os::remove_stack_guard_pages(char* addr, size_t size) { 3327 return os::uncommit_memory(addr, size); 3328 } 3329 3330 // Set protections specified 3331 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3332 bool is_committed) { 3333 unsigned int p = 0; 3334 switch (prot) { 3335 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 3336 case MEM_PROT_READ: p = PAGE_READONLY; break; 3337 case MEM_PROT_RW: p = PAGE_READWRITE; break; 3338 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 3339 default: 3340 ShouldNotReachHere(); 3341 } 3342 3343 DWORD old_status; 3344 3345 // Strange enough, but on Win32 one can change protection only for committed 3346 // memory, not a big deal anyway, as bytes less or equal than 64K 3347 if (!is_committed) { 3348 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX, 3349 "cannot commit protection page"); 3350 } 3351 // One cannot use os::guard_memory() here, as on Win32 guard page 3352 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 3353 // 3354 // Pages in the region become guard pages. Any attempt to access a guard page 3355 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 3356 // the guard page status. Guard pages thus act as a one-time access alarm. 3357 return VirtualProtect(addr, bytes, p, &old_status) != 0; 3358 } 3359 3360 bool os::guard_memory(char* addr, size_t bytes) { 3361 DWORD old_status; 3362 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 3363 } 3364 3365 bool os::unguard_memory(char* addr, size_t bytes) { 3366 DWORD old_status; 3367 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 3368 } 3369 3370 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3371 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3372 void os::numa_make_global(char *addr, size_t bytes) { } 3373 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 3374 bool os::numa_topology_changed() { return false; } 3375 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); } 3376 int os::numa_get_group_id() { return 0; } 3377 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 3378 if (numa_node_list_holder.get_count() == 0 && size > 0) { 3379 // Provide an answer for UMA systems 3380 ids[0] = 0; 3381 return 1; 3382 } else { 3383 // check for size bigger than actual groups_num 3384 size = MIN2(size, numa_get_groups_num()); 3385 for (int i = 0; i < (int)size; i++) { 3386 ids[i] = numa_node_list_holder.get_node_list_entry(i); 3387 } 3388 return size; 3389 } 3390 } 3391 3392 bool os::get_page_info(char *start, page_info* info) { 3393 return false; 3394 } 3395 3396 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 3397 return end; 3398 } 3399 3400 char* os::non_memory_address_word() { 3401 // Must never look like an address returned by reserve_memory, 3402 // even in its subfields (as defined by the CPU immediate fields, 3403 // if the CPU splits constants across multiple instructions). 3404 return (char*)-1; 3405 } 3406 3407 #define MAX_ERROR_COUNT 100 3408 #define SYS_THREAD_ERROR 0xffffffffUL 3409 3410 void os::pd_start_thread(Thread* thread) { 3411 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 3412 // Returns previous suspend state: 3413 // 0: Thread was not suspended 3414 // 1: Thread is running now 3415 // >1: Thread is still suspended. 3416 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3417 } 3418 3419 class HighResolutionInterval : public CHeapObj<mtThread> { 3420 // The default timer resolution seems to be 10 milliseconds. 3421 // (Where is this written down?) 3422 // If someone wants to sleep for only a fraction of the default, 3423 // then we set the timer resolution down to 1 millisecond for 3424 // the duration of their interval. 3425 // We carefully set the resolution back, since otherwise we 3426 // seem to incur an overhead (3%?) that we don't need. 3427 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 3428 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 3429 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 3430 // timeBeginPeriod() if the relative error exceeded some threshold. 3431 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 3432 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 3433 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 3434 // resolution timers running. 3435 private: 3436 jlong resolution; 3437 public: 3438 HighResolutionInterval(jlong ms) { 3439 resolution = ms % 10L; 3440 if (resolution != 0) { 3441 MMRESULT result = timeBeginPeriod(1L); 3442 } 3443 } 3444 ~HighResolutionInterval() { 3445 if (resolution != 0) { 3446 MMRESULT result = timeEndPeriod(1L); 3447 } 3448 resolution = 0L; 3449 } 3450 }; 3451 3452 int os::sleep(Thread* thread, jlong ms, bool interruptable) { 3453 jlong limit = (jlong) MAXDWORD; 3454 3455 while (ms > limit) { 3456 int res; 3457 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) 3458 return res; 3459 ms -= limit; 3460 } 3461 3462 assert(thread == Thread::current(), "thread consistency check"); 3463 OSThread* osthread = thread->osthread(); 3464 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 3465 int result; 3466 if (interruptable) { 3467 assert(thread->is_Java_thread(), "must be java thread"); 3468 JavaThread *jt = (JavaThread *) thread; 3469 ThreadBlockInVM tbivm(jt); 3470 3471 jt->set_suspend_equivalent(); 3472 // cleared by handle_special_suspend_equivalent_condition() or 3473 // java_suspend_self() via check_and_wait_while_suspended() 3474 3475 HANDLE events[1]; 3476 events[0] = osthread->interrupt_event(); 3477 HighResolutionInterval *phri=NULL; 3478 if (!ForceTimeHighResolution) 3479 phri = new HighResolutionInterval(ms); 3480 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 3481 result = OS_TIMEOUT; 3482 } else { 3483 ResetEvent(osthread->interrupt_event()); 3484 osthread->set_interrupted(false); 3485 result = OS_INTRPT; 3486 } 3487 delete phri; //if it is NULL, harmless 3488 3489 // were we externally suspended while we were waiting? 3490 jt->check_and_wait_while_suspended(); 3491 } else { 3492 assert(!thread->is_Java_thread(), "must not be java thread"); 3493 Sleep((long) ms); 3494 result = OS_TIMEOUT; 3495 } 3496 return result; 3497 } 3498 3499 // 3500 // Short sleep, direct OS call. 3501 // 3502 // ms = 0, means allow others (if any) to run. 3503 // 3504 void os::naked_short_sleep(jlong ms) { 3505 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3506 Sleep(ms); 3507 } 3508 3509 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3510 void os::infinite_sleep() { 3511 while (true) { // sleep forever ... 3512 Sleep(100000); // ... 100 seconds at a time 3513 } 3514 } 3515 3516 typedef BOOL (WINAPI * STTSignature)(void); 3517 3518 os::YieldResult os::NakedYield() { 3519 // Use either SwitchToThread() or Sleep(0) 3520 // Consider passing back the return value from SwitchToThread(). 3521 if (os::Kernel32Dll::SwitchToThreadAvailable()) { 3522 return SwitchToThread() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY; 3523 } else { 3524 Sleep(0); 3525 } 3526 return os::YIELD_UNKNOWN; 3527 } 3528 3529 void os::yield() { os::NakedYield(); } 3530 3531 // Win32 only gives you access to seven real priorities at a time, 3532 // so we compress Java's ten down to seven. It would be better 3533 // if we dynamically adjusted relative priorities. 3534 3535 int os::java_to_os_priority[CriticalPriority + 1] = { 3536 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3537 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3538 THREAD_PRIORITY_LOWEST, // 2 3539 THREAD_PRIORITY_BELOW_NORMAL, // 3 3540 THREAD_PRIORITY_BELOW_NORMAL, // 4 3541 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3542 THREAD_PRIORITY_NORMAL, // 6 3543 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3544 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3545 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3546 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority 3547 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority 3548 }; 3549 3550 int prio_policy1[CriticalPriority + 1] = { 3551 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3552 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3553 THREAD_PRIORITY_LOWEST, // 2 3554 THREAD_PRIORITY_BELOW_NORMAL, // 3 3555 THREAD_PRIORITY_BELOW_NORMAL, // 4 3556 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3557 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3558 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3559 THREAD_PRIORITY_HIGHEST, // 8 3560 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3561 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority 3562 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority 3563 }; 3564 3565 static int prio_init() { 3566 // If ThreadPriorityPolicy is 1, switch tables 3567 if (ThreadPriorityPolicy == 1) { 3568 int i; 3569 for (i = 0; i < CriticalPriority + 1; i++) { 3570 os::java_to_os_priority[i] = prio_policy1[i]; 3571 } 3572 } 3573 if (UseCriticalJavaThreadPriority) { 3574 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 3575 } 3576 return 0; 3577 } 3578 3579 OSReturn os::set_native_priority(Thread* thread, int priority) { 3580 if (!UseThreadPriorities) return OS_OK; 3581 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3582 return ret ? OS_OK : OS_ERR; 3583 } 3584 3585 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) { 3586 if (!UseThreadPriorities) { 3587 *priority_ptr = java_to_os_priority[NormPriority]; 3588 return OS_OK; 3589 } 3590 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3591 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3592 assert(false, "GetThreadPriority failed"); 3593 return OS_ERR; 3594 } 3595 *priority_ptr = os_prio; 3596 return OS_OK; 3597 } 3598 3599 3600 // Hint to the underlying OS that a task switch would not be good. 3601 // Void return because it's a hint and can fail. 3602 void os::hint_no_preempt() {} 3603 3604 void os::interrupt(Thread* thread) { 3605 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3606 "possibility of dangling Thread pointer"); 3607 3608 OSThread* osthread = thread->osthread(); 3609 osthread->set_interrupted(true); 3610 // More than one thread can get here with the same value of osthread, 3611 // resulting in multiple notifications. We do, however, want the store 3612 // to interrupted() to be visible to other threads before we post 3613 // the interrupt event. 3614 OrderAccess::release(); 3615 SetEvent(osthread->interrupt_event()); 3616 // For JSR166: unpark after setting status 3617 if (thread->is_Java_thread()) 3618 ((JavaThread*)thread)->parker()->unpark(); 3619 3620 ParkEvent * ev = thread->_ParkEvent; 3621 if (ev != NULL) ev->unpark(); 3622 3623 } 3624 3625 3626 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3627 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3628 "possibility of dangling Thread pointer"); 3629 3630 OSThread* osthread = thread->osthread(); 3631 // There is no synchronization between the setting of the interrupt 3632 // and it being cleared here. It is critical - see 6535709 - that 3633 // we only clear the interrupt state, and reset the interrupt event, 3634 // if we are going to report that we were indeed interrupted - else 3635 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups 3636 // depending on the timing. By checking thread interrupt event to see 3637 // if the thread gets real interrupt thus prevent spurious wakeup. 3638 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0); 3639 if (interrupted && clear_interrupted) { 3640 osthread->set_interrupted(false); 3641 ResetEvent(osthread->interrupt_event()); 3642 } // Otherwise leave the interrupted state alone 3643 3644 return interrupted; 3645 } 3646 3647 // Get's a pc (hint) for a running thread. Currently used only for profiling. 3648 ExtendedPC os::get_thread_pc(Thread* thread) { 3649 CONTEXT context; 3650 context.ContextFlags = CONTEXT_CONTROL; 3651 HANDLE handle = thread->osthread()->thread_handle(); 3652 #ifdef _M_IA64 3653 assert(0, "Fix get_thread_pc"); 3654 return ExtendedPC(NULL); 3655 #else 3656 if (GetThreadContext(handle, &context)) { 3657 #ifdef _M_AMD64 3658 return ExtendedPC((address) context.Rip); 3659 #else 3660 return ExtendedPC((address) context.Eip); 3661 #endif 3662 } else { 3663 return ExtendedPC(NULL); 3664 } 3665 #endif 3666 } 3667 3668 // GetCurrentThreadId() returns DWORD 3669 intx os::current_thread_id() { return GetCurrentThreadId(); } 3670 3671 static int _initial_pid = 0; 3672 3673 int os::current_process_id() 3674 { 3675 return (_initial_pid ? _initial_pid : _getpid()); 3676 } 3677 3678 int os::win32::_vm_page_size = 0; 3679 int os::win32::_vm_allocation_granularity = 0; 3680 int os::win32::_processor_type = 0; 3681 // Processor level is not available on non-NT systems, use vm_version instead 3682 int os::win32::_processor_level = 0; 3683 julong os::win32::_physical_memory = 0; 3684 size_t os::win32::_default_stack_size = 0; 3685 3686 intx os::win32::_os_thread_limit = 0; 3687 volatile intx os::win32::_os_thread_count = 0; 3688 3689 bool os::win32::_is_nt = false; 3690 bool os::win32::_is_windows_2003 = false; 3691 bool os::win32::_is_windows_server = false; 3692 3693 bool os::win32::_has_performance_count = 0; 3694 3695 void os::win32::initialize_system_info() { 3696 SYSTEM_INFO si; 3697 GetSystemInfo(&si); 3698 _vm_page_size = si.dwPageSize; 3699 _vm_allocation_granularity = si.dwAllocationGranularity; 3700 _processor_type = si.dwProcessorType; 3701 _processor_level = si.wProcessorLevel; 3702 set_processor_count(si.dwNumberOfProcessors); 3703 3704 MEMORYSTATUSEX ms; 3705 ms.dwLength = sizeof(ms); 3706 3707 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3708 // dwMemoryLoad (% of memory in use) 3709 GlobalMemoryStatusEx(&ms); 3710 _physical_memory = ms.ullTotalPhys; 3711 3712 OSVERSIONINFOEX oi; 3713 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 3714 GetVersionEx((OSVERSIONINFO*)&oi); 3715 switch (oi.dwPlatformId) { 3716 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 3717 case VER_PLATFORM_WIN32_NT: 3718 _is_nt = true; 3719 { 3720 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3721 if (os_vers == 5002) { 3722 _is_windows_2003 = true; 3723 } 3724 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER || 3725 oi.wProductType == VER_NT_SERVER) { 3726 _is_windows_server = true; 3727 } 3728 } 3729 break; 3730 default: fatal("Unknown platform"); 3731 } 3732 3733 _default_stack_size = os::current_stack_size(); 3734 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3735 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3736 "stack size not a multiple of page size"); 3737 3738 initialize_performance_counter(); 3739 3740 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is 3741 // known to deadlock the system, if the VM issues to thread operations with 3742 // a too high frequency, e.g., such as changing the priorities. 3743 // The 6000 seems to work well - no deadlocks has been notices on the test 3744 // programs that we have seen experience this problem. 3745 if (!os::win32::is_nt()) { 3746 StarvationMonitorInterval = 6000; 3747 } 3748 } 3749 3750 3751 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) { 3752 char path[MAX_PATH]; 3753 DWORD size; 3754 DWORD pathLen = (DWORD)sizeof(path); 3755 HINSTANCE result = NULL; 3756 3757 // only allow library name without path component 3758 assert(strchr(name, '\\') == NULL, "path not allowed"); 3759 assert(strchr(name, ':') == NULL, "path not allowed"); 3760 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) { 3761 jio_snprintf(ebuf, ebuflen, 3762 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name); 3763 return NULL; 3764 } 3765 3766 // search system directory 3767 if ((size = GetSystemDirectory(path, pathLen)) > 0) { 3768 strcat(path, "\\"); 3769 strcat(path, name); 3770 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3771 return result; 3772 } 3773 } 3774 3775 // try Windows directory 3776 if ((size = GetWindowsDirectory(path, pathLen)) > 0) { 3777 strcat(path, "\\"); 3778 strcat(path, name); 3779 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3780 return result; 3781 } 3782 } 3783 3784 jio_snprintf(ebuf, ebuflen, 3785 "os::win32::load_windows_dll() cannot load %s from system directories.", name); 3786 return NULL; 3787 } 3788 3789 void os::win32::setmode_streams() { 3790 _setmode(_fileno(stdin), _O_BINARY); 3791 _setmode(_fileno(stdout), _O_BINARY); 3792 _setmode(_fileno(stderr), _O_BINARY); 3793 } 3794 3795 3796 bool os::is_debugger_attached() { 3797 return IsDebuggerPresent() ? true : false; 3798 } 3799 3800 3801 void os::wait_for_keypress_at_exit(void) { 3802 if (PauseAtExit) { 3803 fprintf(stderr, "Press any key to continue...\n"); 3804 fgetc(stdin); 3805 } 3806 } 3807 3808 3809 int os::message_box(const char* title, const char* message) { 3810 int result = MessageBox(NULL, message, title, 3811 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 3812 return result == IDYES; 3813 } 3814 3815 int os::allocate_thread_local_storage() { 3816 return TlsAlloc(); 3817 } 3818 3819 3820 void os::free_thread_local_storage(int index) { 3821 TlsFree(index); 3822 } 3823 3824 3825 void os::thread_local_storage_at_put(int index, void* value) { 3826 TlsSetValue(index, value); 3827 assert(thread_local_storage_at(index) == value, "Just checking"); 3828 } 3829 3830 3831 void* os::thread_local_storage_at(int index) { 3832 return TlsGetValue(index); 3833 } 3834 3835 3836 #ifndef PRODUCT 3837 #ifndef _WIN64 3838 // Helpers to check whether NX protection is enabled 3839 int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 3840 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 3841 pex->ExceptionRecord->NumberParameters > 0 && 3842 pex->ExceptionRecord->ExceptionInformation[0] == 3843 EXCEPTION_INFO_EXEC_VIOLATION) { 3844 return EXCEPTION_EXECUTE_HANDLER; 3845 } 3846 return EXCEPTION_CONTINUE_SEARCH; 3847 } 3848 3849 void nx_check_protection() { 3850 // If NX is enabled we'll get an exception calling into code on the stack 3851 char code[] = { (char)0xC3 }; // ret 3852 void *code_ptr = (void *)code; 3853 __try { 3854 __asm call code_ptr 3855 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 3856 tty->print_raw_cr("NX protection detected."); 3857 } 3858 } 3859 #endif // _WIN64 3860 #endif // PRODUCT 3861 3862 // this is called _before_ the global arguments have been parsed 3863 void os::init(void) { 3864 _initial_pid = _getpid(); 3865 3866 init_random(1234567); 3867 3868 win32::initialize_system_info(); 3869 win32::setmode_streams(); 3870 init_page_sizes((size_t) win32::vm_page_size()); 3871 3872 // This may be overridden later when argument processing is done. 3873 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, 3874 os::win32::is_windows_2003()); 3875 3876 // Initialize main_process and main_thread 3877 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 3878 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 3879 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 3880 fatal("DuplicateHandle failed\n"); 3881 } 3882 main_thread_id = (int) GetCurrentThreadId(); 3883 } 3884 3885 // To install functions for atexit processing 3886 extern "C" { 3887 static void perfMemory_exit_helper() { 3888 perfMemory_exit(); 3889 } 3890 } 3891 3892 static jint initSock(); 3893 3894 // this is called _after_ the global arguments have been parsed 3895 jint os::init_2(void) { 3896 // Allocate a single page and mark it as readable for safepoint polling 3897 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 3898 guarantee(polling_page != NULL, "Reserve Failed for polling page"); 3899 3900 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 3901 guarantee(return_page != NULL, "Commit Failed for polling page"); 3902 3903 os::set_polling_page(polling_page); 3904 3905 #ifndef PRODUCT 3906 if (Verbose && PrintMiscellaneous) 3907 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 3908 #endif 3909 3910 if (!UseMembar) { 3911 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE); 3912 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 3913 3914 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE); 3915 guarantee(return_page != NULL, "Commit Failed for memory serialize page"); 3916 3917 os::set_memory_serialize_page(mem_serialize_page); 3918 3919 #ifndef PRODUCT 3920 if (Verbose && PrintMiscellaneous) 3921 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3922 #endif 3923 } 3924 3925 // Setup Windows Exceptions 3926 3927 // for debugging float code generation bugs 3928 if (ForceFloatExceptions) { 3929 #ifndef _WIN64 3930 static long fp_control_word = 0; 3931 __asm { fstcw fp_control_word } 3932 // see Intel PPro Manual, Vol. 2, p 7-16 3933 const long precision = 0x20; 3934 const long underflow = 0x10; 3935 const long overflow = 0x08; 3936 const long zero_div = 0x04; 3937 const long denorm = 0x02; 3938 const long invalid = 0x01; 3939 fp_control_word |= invalid; 3940 __asm { fldcw fp_control_word } 3941 #endif 3942 } 3943 3944 // If stack_commit_size is 0, windows will reserve the default size, 3945 // but only commit a small portion of it. 3946 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 3947 size_t default_reserve_size = os::win32::default_stack_size(); 3948 size_t actual_reserve_size = stack_commit_size; 3949 if (stack_commit_size < default_reserve_size) { 3950 // If stack_commit_size == 0, we want this too 3951 actual_reserve_size = default_reserve_size; 3952 } 3953 3954 // Check minimum allowable stack size for thread creation and to initialize 3955 // the java system classes, including StackOverflowError - depends on page 3956 // size. Add a page for compiler2 recursion in main thread. 3957 // Add in 2*BytesPerWord times page size to account for VM stack during 3958 // class initialization depending on 32 or 64 bit VM. 3959 size_t min_stack_allowed = 3960 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 3961 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size(); 3962 if (actual_reserve_size < min_stack_allowed) { 3963 tty->print_cr("\nThe stack size specified is too small, " 3964 "Specify at least %dk", 3965 min_stack_allowed / K); 3966 return JNI_ERR; 3967 } 3968 3969 JavaThread::set_stack_size_at_create(stack_commit_size); 3970 3971 // Calculate theoretical max. size of Threads to guard gainst artifical 3972 // out-of-memory situations, where all available address-space has been 3973 // reserved by thread stacks. 3974 assert(actual_reserve_size != 0, "Must have a stack"); 3975 3976 // Calculate the thread limit when we should start doing Virtual Memory 3977 // banging. Currently when the threads will have used all but 200Mb of space. 3978 // 3979 // TODO: consider performing a similar calculation for commit size instead 3980 // as reserve size, since on a 64-bit platform we'll run into that more 3981 // often than running out of virtual memory space. We can use the 3982 // lower value of the two calculations as the os_thread_limit. 3983 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 3984 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 3985 3986 // at exit methods are called in the reverse order of their registration. 3987 // there is no limit to the number of functions registered. atexit does 3988 // not set errno. 3989 3990 if (PerfAllowAtExitRegistration) { 3991 // only register atexit functions if PerfAllowAtExitRegistration is set. 3992 // atexit functions can be delayed until process exit time, which 3993 // can be problematic for embedded VM situations. Embedded VMs should 3994 // call DestroyJavaVM() to assure that VM resources are released. 3995 3996 // note: perfMemory_exit_helper atexit function may be removed in 3997 // the future if the appropriate cleanup code can be added to the 3998 // VM_Exit VMOperation's doit method. 3999 if (atexit(perfMemory_exit_helper) != 0) { 4000 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 4001 } 4002 } 4003 4004 #ifndef _WIN64 4005 // Print something if NX is enabled (win32 on AMD64) 4006 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 4007 #endif 4008 4009 // initialize thread priority policy 4010 prio_init(); 4011 4012 if (UseNUMA && !ForceNUMA) { 4013 UseNUMA = false; // We don't fully support this yet 4014 } 4015 4016 if (UseNUMAInterleaving) { 4017 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag 4018 bool success = numa_interleaving_init(); 4019 if (!success) UseNUMAInterleaving = false; 4020 } 4021 4022 if (initSock() != JNI_OK) { 4023 return JNI_ERR; 4024 } 4025 4026 return JNI_OK; 4027 } 4028 4029 void os::init_3(void) { 4030 return; 4031 } 4032 4033 // Mark the polling page as unreadable 4034 void os::make_polling_page_unreadable(void) { 4035 DWORD old_status; 4036 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status)) 4037 fatal("Could not disable polling page"); 4038 }; 4039 4040 // Mark the polling page as readable 4041 void os::make_polling_page_readable(void) { 4042 DWORD old_status; 4043 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status)) 4044 fatal("Could not enable polling page"); 4045 }; 4046 4047 4048 int os::stat(const char *path, struct stat *sbuf) { 4049 char pathbuf[MAX_PATH]; 4050 if (strlen(path) > MAX_PATH - 1) { 4051 errno = ENAMETOOLONG; 4052 return -1; 4053 } 4054 os::native_path(strcpy(pathbuf, path)); 4055 int ret = ::stat(pathbuf, sbuf); 4056 if (sbuf != NULL && UseUTCFileTimestamp) { 4057 // Fix for 6539723. st_mtime returned from stat() is dependent on 4058 // the system timezone and so can return different values for the 4059 // same file if/when daylight savings time changes. This adjustment 4060 // makes sure the same timestamp is returned regardless of the TZ. 4061 // 4062 // See: 4063 // http://msdn.microsoft.com/library/ 4064 // default.asp?url=/library/en-us/sysinfo/base/ 4065 // time_zone_information_str.asp 4066 // and 4067 // http://msdn.microsoft.com/library/default.asp?url= 4068 // /library/en-us/sysinfo/base/settimezoneinformation.asp 4069 // 4070 // NOTE: there is a insidious bug here: If the timezone is changed 4071 // after the call to stat() but before 'GetTimeZoneInformation()', then 4072 // the adjustment we do here will be wrong and we'll return the wrong 4073 // value (which will likely end up creating an invalid class data 4074 // archive). Absent a better API for this, or some time zone locking 4075 // mechanism, we'll have to live with this risk. 4076 TIME_ZONE_INFORMATION tz; 4077 DWORD tzid = GetTimeZoneInformation(&tz); 4078 int daylightBias = 4079 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 4080 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 4081 } 4082 return ret; 4083 } 4084 4085 4086 #define FT2INT64(ft) \ 4087 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 4088 4089 4090 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4091 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4092 // of a thread. 4093 // 4094 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4095 // the fast estimate available on the platform. 4096 4097 // current_thread_cpu_time() is not optimized for Windows yet 4098 jlong os::current_thread_cpu_time() { 4099 // return user + sys since the cost is the same 4100 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 4101 } 4102 4103 jlong os::thread_cpu_time(Thread* thread) { 4104 // consistent with what current_thread_cpu_time() returns. 4105 return os::thread_cpu_time(thread, true /* user+sys */); 4106 } 4107 4108 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4109 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4110 } 4111 4112 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 4113 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 4114 // If this function changes, os::is_thread_cpu_time_supported() should too 4115 if (os::win32::is_nt()) { 4116 FILETIME CreationTime; 4117 FILETIME ExitTime; 4118 FILETIME KernelTime; 4119 FILETIME UserTime; 4120 4121 if (GetThreadTimes(thread->osthread()->thread_handle(), 4122 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 4123 return -1; 4124 else 4125 if (user_sys_cpu_time) { 4126 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 4127 } else { 4128 return FT2INT64(UserTime) * 100; 4129 } 4130 } else { 4131 return (jlong) timeGetTime() * 1000000; 4132 } 4133 } 4134 4135 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4136 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4137 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4138 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4139 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4140 } 4141 4142 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4143 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4144 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4145 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4146 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4147 } 4148 4149 bool os::is_thread_cpu_time_supported() { 4150 // see os::thread_cpu_time 4151 if (os::win32::is_nt()) { 4152 FILETIME CreationTime; 4153 FILETIME ExitTime; 4154 FILETIME KernelTime; 4155 FILETIME UserTime; 4156 4157 if (GetThreadTimes(GetCurrentThread(), 4158 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 4159 return false; 4160 else 4161 return true; 4162 } else { 4163 return false; 4164 } 4165 } 4166 4167 // Windows does't provide a loadavg primitive so this is stubbed out for now. 4168 // It does have primitives (PDH API) to get CPU usage and run queue length. 4169 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 4170 // If we wanted to implement loadavg on Windows, we have a few options: 4171 // 4172 // a) Query CPU usage and run queue length and "fake" an answer by 4173 // returning the CPU usage if it's under 100%, and the run queue 4174 // length otherwise. It turns out that querying is pretty slow 4175 // on Windows, on the order of 200 microseconds on a fast machine. 4176 // Note that on the Windows the CPU usage value is the % usage 4177 // since the last time the API was called (and the first call 4178 // returns 100%), so we'd have to deal with that as well. 4179 // 4180 // b) Sample the "fake" answer using a sampling thread and store 4181 // the answer in a global variable. The call to loadavg would 4182 // just return the value of the global, avoiding the slow query. 4183 // 4184 // c) Sample a better answer using exponential decay to smooth the 4185 // value. This is basically the algorithm used by UNIX kernels. 4186 // 4187 // Note that sampling thread starvation could affect both (b) and (c). 4188 int os::loadavg(double loadavg[], int nelem) { 4189 return -1; 4190 } 4191 4192 4193 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 4194 bool os::dont_yield() { 4195 return DontYieldALot; 4196 } 4197 4198 // This method is a slightly reworked copy of JDK's sysOpen 4199 // from src/windows/hpi/src/sys_api_md.c 4200 4201 int os::open(const char *path, int oflag, int mode) { 4202 char pathbuf[MAX_PATH]; 4203 4204 if (strlen(path) > MAX_PATH - 1) { 4205 errno = ENAMETOOLONG; 4206 return -1; 4207 } 4208 os::native_path(strcpy(pathbuf, path)); 4209 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 4210 } 4211 4212 FILE* os::open(int fd, const char* mode) { 4213 return ::_fdopen(fd, mode); 4214 } 4215 4216 // Is a (classpath) directory empty? 4217 bool os::dir_is_empty(const char* path) { 4218 WIN32_FIND_DATA fd; 4219 HANDLE f = FindFirstFile(path, &fd); 4220 if (f == INVALID_HANDLE_VALUE) { 4221 return true; 4222 } 4223 FindClose(f); 4224 return false; 4225 } 4226 4227 // create binary file, rewriting existing file if required 4228 int os::create_binary_file(const char* path, bool rewrite_existing) { 4229 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 4230 if (!rewrite_existing) { 4231 oflags |= _O_EXCL; 4232 } 4233 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 4234 } 4235 4236 // return current position of file pointer 4237 jlong os::current_file_offset(int fd) { 4238 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 4239 } 4240 4241 // move file pointer to the specified offset 4242 jlong os::seek_to_file_offset(int fd, jlong offset) { 4243 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 4244 } 4245 4246 4247 jlong os::lseek(int fd, jlong offset, int whence) { 4248 return (jlong) ::_lseeki64(fd, offset, whence); 4249 } 4250 4251 // This method is a slightly reworked copy of JDK's sysNativePath 4252 // from src/windows/hpi/src/path_md.c 4253 4254 /* Convert a pathname to native format. On win32, this involves forcing all 4255 separators to be '\\' rather than '/' (both are legal inputs, but Win95 4256 sometimes rejects '/') and removing redundant separators. The input path is 4257 assumed to have been converted into the character encoding used by the local 4258 system. Because this might be a double-byte encoding, care is taken to 4259 treat double-byte lead characters correctly. 4260 4261 This procedure modifies the given path in place, as the result is never 4262 longer than the original. There is no error return; this operation always 4263 succeeds. */ 4264 char * os::native_path(char *path) { 4265 char *src = path, *dst = path, *end = path; 4266 char *colon = NULL; /* If a drive specifier is found, this will 4267 point to the colon following the drive 4268 letter */ 4269 4270 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */ 4271 assert(((!::IsDBCSLeadByte('/')) 4272 && (!::IsDBCSLeadByte('\\')) 4273 && (!::IsDBCSLeadByte(':'))), 4274 "Illegal lead byte"); 4275 4276 /* Check for leading separators */ 4277 #define isfilesep(c) ((c) == '/' || (c) == '\\') 4278 while (isfilesep(*src)) { 4279 src++; 4280 } 4281 4282 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 4283 /* Remove leading separators if followed by drive specifier. This 4284 hack is necessary to support file URLs containing drive 4285 specifiers (e.g., "file://c:/path"). As a side effect, 4286 "/c:/path" can be used as an alternative to "c:/path". */ 4287 *dst++ = *src++; 4288 colon = dst; 4289 *dst++ = ':'; 4290 src++; 4291 } else { 4292 src = path; 4293 if (isfilesep(src[0]) && isfilesep(src[1])) { 4294 /* UNC pathname: Retain first separator; leave src pointed at 4295 second separator so that further separators will be collapsed 4296 into the second separator. The result will be a pathname 4297 beginning with "\\\\" followed (most likely) by a host name. */ 4298 src = dst = path + 1; 4299 path[0] = '\\'; /* Force first separator to '\\' */ 4300 } 4301 } 4302 4303 end = dst; 4304 4305 /* Remove redundant separators from remainder of path, forcing all 4306 separators to be '\\' rather than '/'. Also, single byte space 4307 characters are removed from the end of the path because those 4308 are not legal ending characters on this operating system. 4309 */ 4310 while (*src != '\0') { 4311 if (isfilesep(*src)) { 4312 *dst++ = '\\'; src++; 4313 while (isfilesep(*src)) src++; 4314 if (*src == '\0') { 4315 /* Check for trailing separator */ 4316 end = dst; 4317 if (colon == dst - 2) break; /* "z:\\" */ 4318 if (dst == path + 1) break; /* "\\" */ 4319 if (dst == path + 2 && isfilesep(path[0])) { 4320 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the 4321 beginning of a UNC pathname. Even though it is not, by 4322 itself, a valid UNC pathname, we leave it as is in order 4323 to be consistent with the path canonicalizer as well 4324 as the win32 APIs, which treat this case as an invalid 4325 UNC pathname rather than as an alias for the root 4326 directory of the current drive. */ 4327 break; 4328 } 4329 end = --dst; /* Path does not denote a root directory, so 4330 remove trailing separator */ 4331 break; 4332 } 4333 end = dst; 4334 } else { 4335 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */ 4336 *dst++ = *src++; 4337 if (*src) *dst++ = *src++; 4338 end = dst; 4339 } else { /* Copy a single-byte character */ 4340 char c = *src++; 4341 *dst++ = c; 4342 /* Space is not a legal ending character */ 4343 if (c != ' ') end = dst; 4344 } 4345 } 4346 } 4347 4348 *end = '\0'; 4349 4350 /* For "z:", add "." to work around a bug in the C runtime library */ 4351 if (colon == dst - 1) { 4352 path[2] = '.'; 4353 path[3] = '\0'; 4354 } 4355 4356 return path; 4357 } 4358 4359 // This code is a copy of JDK's sysSetLength 4360 // from src/windows/hpi/src/sys_api_md.c 4361 4362 int os::ftruncate(int fd, jlong length) { 4363 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4364 long high = (long)(length >> 32); 4365 DWORD ret; 4366 4367 if (h == (HANDLE)(-1)) { 4368 return -1; 4369 } 4370 4371 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 4372 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 4373 return -1; 4374 } 4375 4376 if (::SetEndOfFile(h) == FALSE) { 4377 return -1; 4378 } 4379 4380 return 0; 4381 } 4382 4383 4384 // This code is a copy of JDK's sysSync 4385 // from src/windows/hpi/src/sys_api_md.c 4386 // except for the legacy workaround for a bug in Win 98 4387 4388 int os::fsync(int fd) { 4389 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 4390 4391 if ((!::FlushFileBuffers(handle)) && 4392 (GetLastError() != ERROR_ACCESS_DENIED) ) { 4393 /* from winerror.h */ 4394 return -1; 4395 } 4396 return 0; 4397 } 4398 4399 static int nonSeekAvailable(int, long *); 4400 static int stdinAvailable(int, long *); 4401 4402 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR) 4403 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO) 4404 4405 // This code is a copy of JDK's sysAvailable 4406 // from src/windows/hpi/src/sys_api_md.c 4407 4408 int os::available(int fd, jlong *bytes) { 4409 jlong cur, end; 4410 struct _stati64 stbuf64; 4411 4412 if (::_fstati64(fd, &stbuf64) >= 0) { 4413 int mode = stbuf64.st_mode; 4414 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 4415 int ret; 4416 long lpbytes; 4417 if (fd == 0) { 4418 ret = stdinAvailable(fd, &lpbytes); 4419 } else { 4420 ret = nonSeekAvailable(fd, &lpbytes); 4421 } 4422 (*bytes) = (jlong)(lpbytes); 4423 return ret; 4424 } 4425 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 4426 return FALSE; 4427 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 4428 return FALSE; 4429 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 4430 return FALSE; 4431 } 4432 *bytes = end - cur; 4433 return TRUE; 4434 } else { 4435 return FALSE; 4436 } 4437 } 4438 4439 // This code is a copy of JDK's nonSeekAvailable 4440 // from src/windows/hpi/src/sys_api_md.c 4441 4442 static int nonSeekAvailable(int fd, long *pbytes) { 4443 /* This is used for available on non-seekable devices 4444 * (like both named and anonymous pipes, such as pipes 4445 * connected to an exec'd process). 4446 * Standard Input is a special case. 4447 * 4448 */ 4449 HANDLE han; 4450 4451 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 4452 return FALSE; 4453 } 4454 4455 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 4456 /* PeekNamedPipe fails when at EOF. In that case we 4457 * simply make *pbytes = 0 which is consistent with the 4458 * behavior we get on Solaris when an fd is at EOF. 4459 * The only alternative is to raise an Exception, 4460 * which isn't really warranted. 4461 */ 4462 if (::GetLastError() != ERROR_BROKEN_PIPE) { 4463 return FALSE; 4464 } 4465 *pbytes = 0; 4466 } 4467 return TRUE; 4468 } 4469 4470 #define MAX_INPUT_EVENTS 2000 4471 4472 // This code is a copy of JDK's stdinAvailable 4473 // from src/windows/hpi/src/sys_api_md.c 4474 4475 static int stdinAvailable(int fd, long *pbytes) { 4476 HANDLE han; 4477 DWORD numEventsRead = 0; /* Number of events read from buffer */ 4478 DWORD numEvents = 0; /* Number of events in buffer */ 4479 DWORD i = 0; /* Loop index */ 4480 DWORD curLength = 0; /* Position marker */ 4481 DWORD actualLength = 0; /* Number of bytes readable */ 4482 BOOL error = FALSE; /* Error holder */ 4483 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */ 4484 4485 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4486 return FALSE; 4487 } 4488 4489 /* Construct an array of input records in the console buffer */ 4490 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4491 if (error == 0) { 4492 return nonSeekAvailable(fd, pbytes); 4493 } 4494 4495 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */ 4496 if (numEvents > MAX_INPUT_EVENTS) { 4497 numEvents = MAX_INPUT_EVENTS; 4498 } 4499 4500 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal); 4501 if (lpBuffer == NULL) { 4502 return FALSE; 4503 } 4504 4505 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4506 if (error == 0) { 4507 os::free(lpBuffer, mtInternal); 4508 return FALSE; 4509 } 4510 4511 /* Examine input records for the number of bytes available */ 4512 for (i=0; i<numEvents; i++) { 4513 if (lpBuffer[i].EventType == KEY_EVENT) { 4514 4515 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4516 &(lpBuffer[i].Event); 4517 if (keyRecord->bKeyDown == TRUE) { 4518 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4519 curLength++; 4520 if (*keyPressed == '\r') { 4521 actualLength = curLength; 4522 } 4523 } 4524 } 4525 } 4526 4527 if (lpBuffer != NULL) { 4528 os::free(lpBuffer, mtInternal); 4529 } 4530 4531 *pbytes = (long) actualLength; 4532 return TRUE; 4533 } 4534 4535 // Map a block of memory. 4536 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4537 char *addr, size_t bytes, bool read_only, 4538 bool allow_exec) { 4539 HANDLE hFile; 4540 char* base; 4541 4542 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4543 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4544 if (hFile == NULL) { 4545 if (PrintMiscellaneous && Verbose) { 4546 DWORD err = GetLastError(); 4547 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err); 4548 } 4549 return NULL; 4550 } 4551 4552 if (allow_exec) { 4553 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4554 // unless it comes from a PE image (which the shared archive is not.) 4555 // Even VirtualProtect refuses to give execute access to mapped memory 4556 // that was not previously executable. 4557 // 4558 // Instead, stick the executable region in anonymous memory. Yuck. 4559 // Penalty is that ~4 pages will not be shareable - in the future 4560 // we might consider DLLizing the shared archive with a proper PE 4561 // header so that mapping executable + sharing is possible. 4562 4563 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4564 PAGE_READWRITE); 4565 if (base == NULL) { 4566 if (PrintMiscellaneous && Verbose) { 4567 DWORD err = GetLastError(); 4568 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 4569 } 4570 CloseHandle(hFile); 4571 return NULL; 4572 } 4573 4574 DWORD bytes_read; 4575 OVERLAPPED overlapped; 4576 overlapped.Offset = (DWORD)file_offset; 4577 overlapped.OffsetHigh = 0; 4578 overlapped.hEvent = NULL; 4579 // ReadFile guarantees that if the return value is true, the requested 4580 // number of bytes were read before returning. 4581 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 4582 if (!res) { 4583 if (PrintMiscellaneous && Verbose) { 4584 DWORD err = GetLastError(); 4585 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 4586 } 4587 release_memory(base, bytes); 4588 CloseHandle(hFile); 4589 return NULL; 4590 } 4591 } else { 4592 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 4593 NULL /*file_name*/); 4594 if (hMap == NULL) { 4595 if (PrintMiscellaneous && Verbose) { 4596 DWORD err = GetLastError(); 4597 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err); 4598 } 4599 CloseHandle(hFile); 4600 return NULL; 4601 } 4602 4603 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 4604 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 4605 (DWORD)bytes, addr); 4606 if (base == NULL) { 4607 if (PrintMiscellaneous && Verbose) { 4608 DWORD err = GetLastError(); 4609 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 4610 } 4611 CloseHandle(hMap); 4612 CloseHandle(hFile); 4613 return NULL; 4614 } 4615 4616 if (CloseHandle(hMap) == 0) { 4617 if (PrintMiscellaneous && Verbose) { 4618 DWORD err = GetLastError(); 4619 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 4620 } 4621 CloseHandle(hFile); 4622 return base; 4623 } 4624 } 4625 4626 if (allow_exec) { 4627 DWORD old_protect; 4628 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 4629 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 4630 4631 if (!res) { 4632 if (PrintMiscellaneous && Verbose) { 4633 DWORD err = GetLastError(); 4634 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 4635 } 4636 // Don't consider this a hard error, on IA32 even if the 4637 // VirtualProtect fails, we should still be able to execute 4638 CloseHandle(hFile); 4639 return base; 4640 } 4641 } 4642 4643 if (CloseHandle(hFile) == 0) { 4644 if (PrintMiscellaneous && Verbose) { 4645 DWORD err = GetLastError(); 4646 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 4647 } 4648 return base; 4649 } 4650 4651 return base; 4652 } 4653 4654 4655 // Remap a block of memory. 4656 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4657 char *addr, size_t bytes, bool read_only, 4658 bool allow_exec) { 4659 // This OS does not allow existing memory maps to be remapped so we 4660 // have to unmap the memory before we remap it. 4661 if (!os::unmap_memory(addr, bytes)) { 4662 return NULL; 4663 } 4664 4665 // There is a very small theoretical window between the unmap_memory() 4666 // call above and the map_memory() call below where a thread in native 4667 // code may be able to access an address that is no longer mapped. 4668 4669 return os::map_memory(fd, file_name, file_offset, addr, bytes, 4670 read_only, allow_exec); 4671 } 4672 4673 4674 // Unmap a block of memory. 4675 // Returns true=success, otherwise false. 4676 4677 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4678 BOOL result = UnmapViewOfFile(addr); 4679 if (result == 0) { 4680 if (PrintMiscellaneous && Verbose) { 4681 DWORD err = GetLastError(); 4682 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 4683 } 4684 return false; 4685 } 4686 return true; 4687 } 4688 4689 void os::pause() { 4690 char filename[MAX_PATH]; 4691 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4692 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4693 } else { 4694 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4695 } 4696 4697 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4698 if (fd != -1) { 4699 struct stat buf; 4700 ::close(fd); 4701 while (::stat(filename, &buf) == 0) { 4702 Sleep(100); 4703 } 4704 } else { 4705 jio_fprintf(stderr, 4706 "Could not open pause file '%s', continuing immediately.\n", filename); 4707 } 4708 } 4709 4710 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 4711 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 4712 } 4713 4714 /* 4715 * See the caveats for this class in os_windows.hpp 4716 * Protects the callback call so that raised OS EXCEPTIONS causes a jump back 4717 * into this method and returns false. If no OS EXCEPTION was raised, returns 4718 * true. 4719 * The callback is supposed to provide the method that should be protected. 4720 */ 4721 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 4722 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); 4723 assert(!WatcherThread::watcher_thread()->has_crash_protection(), 4724 "crash_protection already set?"); 4725 4726 bool success = true; 4727 __try { 4728 WatcherThread::watcher_thread()->set_crash_protection(this); 4729 cb.call(); 4730 } __except(EXCEPTION_EXECUTE_HANDLER) { 4731 // only for protection, nothing to do 4732 success = false; 4733 } 4734 WatcherThread::watcher_thread()->set_crash_protection(NULL); 4735 return success; 4736 } 4737 4738 // An Event wraps a win32 "CreateEvent" kernel handle. 4739 // 4740 // We have a number of choices regarding "CreateEvent" win32 handle leakage: 4741 // 4742 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 4743 // field, and call CloseHandle() on the win32 event handle. Unpark() would 4744 // need to be modified to tolerate finding a NULL (invalid) win32 event handle. 4745 // In addition, an unpark() operation might fetch the handle field, but the 4746 // event could recycle between the fetch and the SetEvent() operation. 4747 // SetEvent() would either fail because the handle was invalid, or inadvertently work, 4748 // as the win32 handle value had been recycled. In an ideal world calling SetEvent() 4749 // on an stale but recycled handle would be harmless, but in practice this might 4750 // confuse other non-Sun code, so it's not a viable approach. 4751 // 4752 // 2: Once a win32 event handle is associated with an Event, it remains associated 4753 // with the Event. The event handle is never closed. This could be construed 4754 // as handle leakage, but only up to the maximum # of threads that have been extant 4755 // at any one time. This shouldn't be an issue, as windows platforms typically 4756 // permit a process to have hundreds of thousands of open handles. 4757 // 4758 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 4759 // and release unused handles. 4760 // 4761 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 4762 // It's not clear, however, that we wouldn't be trading one type of leak for another. 4763 // 4764 // 5. Use an RCU-like mechanism (Read-Copy Update). 4765 // Or perhaps something similar to Maged Michael's "Hazard pointers". 4766 // 4767 // We use (2). 4768 // 4769 // TODO-FIXME: 4770 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 4771 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 4772 // to recover from (or at least detect) the dreaded Windows 841176 bug. 4773 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 4774 // into a single win32 CreateEvent() handle. 4775 // 4776 // _Event transitions in park() 4777 // -1 => -1 : illegal 4778 // 1 => 0 : pass - return immediately 4779 // 0 => -1 : block 4780 // 4781 // _Event serves as a restricted-range semaphore : 4782 // -1 : thread is blocked 4783 // 0 : neutral - thread is running or ready 4784 // 1 : signaled - thread is running or ready 4785 // 4786 // Another possible encoding of _Event would be 4787 // with explicit "PARKED" and "SIGNALED" bits. 4788 4789 int os::PlatformEvent::park (jlong Millis) { 4790 guarantee(_ParkHandle != NULL , "Invariant"); 4791 guarantee(Millis > 0 , "Invariant"); 4792 int v; 4793 4794 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 4795 // the initial park() operation. 4796 4797 for (;;) { 4798 v = _Event; 4799 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4800 } 4801 guarantee((v == 0) || (v == 1), "invariant"); 4802 if (v != 0) return OS_OK; 4803 4804 // Do this the hard way by blocking ... 4805 // TODO: consider a brief spin here, gated on the success of recent 4806 // spin attempts by this thread. 4807 // 4808 // We decompose long timeouts into series of shorter timed waits. 4809 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 4810 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 4811 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 4812 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 4813 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 4814 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 4815 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 4816 // for the already waited time. This policy does not admit any new outcomes. 4817 // In the future, however, we might want to track the accumulated wait time and 4818 // adjust Millis accordingly if we encounter a spurious wakeup. 4819 4820 const int MAXTIMEOUT = 0x10000000; 4821 DWORD rv = WAIT_TIMEOUT; 4822 while (_Event < 0 && Millis > 0) { 4823 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT) 4824 if (Millis > MAXTIMEOUT) { 4825 prd = MAXTIMEOUT; 4826 } 4827 rv = ::WaitForSingleObject(_ParkHandle, prd); 4828 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed"); 4829 if (rv == WAIT_TIMEOUT) { 4830 Millis -= prd; 4831 } 4832 } 4833 v = _Event; 4834 _Event = 0; 4835 // see comment at end of os::PlatformEvent::park() below: 4836 OrderAccess::fence(); 4837 // If we encounter a nearly simultanous timeout expiry and unpark() 4838 // we return OS_OK indicating we awoke via unpark(). 4839 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 4840 return (v >= 0) ? OS_OK : OS_TIMEOUT; 4841 } 4842 4843 void os::PlatformEvent::park() { 4844 guarantee(_ParkHandle != NULL, "Invariant"); 4845 // Invariant: Only the thread associated with the Event/PlatformEvent 4846 // may call park(). 4847 int v; 4848 for (;;) { 4849 v = _Event; 4850 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4851 } 4852 guarantee((v == 0) || (v == 1), "invariant"); 4853 if (v != 0) return; 4854 4855 // Do this the hard way by blocking ... 4856 // TODO: consider a brief spin here, gated on the success of recent 4857 // spin attempts by this thread. 4858 while (_Event < 0) { 4859 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE); 4860 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed"); 4861 } 4862 4863 // Usually we'll find _Event == 0 at this point, but as 4864 // an optional optimization we clear it, just in case can 4865 // multiple unpark() operations drove _Event up to 1. 4866 _Event = 0; 4867 OrderAccess::fence(); 4868 guarantee(_Event >= 0, "invariant"); 4869 } 4870 4871 void os::PlatformEvent::unpark() { 4872 guarantee(_ParkHandle != NULL, "Invariant"); 4873 4874 // Transitions for _Event: 4875 // 0 :=> 1 4876 // 1 :=> 1 4877 // -1 :=> either 0 or 1; must signal target thread 4878 // That is, we can safely transition _Event from -1 to either 4879 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back 4880 // unpark() calls. 4881 // See also: "Semaphores in Plan 9" by Mullender & Cox 4882 // 4883 // Note: Forcing a transition from "-1" to "1" on an unpark() means 4884 // that it will take two back-to-back park() calls for the owning 4885 // thread to block. This has the benefit of forcing a spurious return 4886 // from the first park() call after an unpark() call which will help 4887 // shake out uses of park() and unpark() without condition variables. 4888 4889 if (Atomic::xchg(1, &_Event) >= 0) return; 4890 4891 ::SetEvent(_ParkHandle); 4892 } 4893 4894 4895 // JSR166 4896 // ------------------------------------------------------- 4897 4898 /* 4899 * The Windows implementation of Park is very straightforward: Basic 4900 * operations on Win32 Events turn out to have the right semantics to 4901 * use them directly. We opportunistically resuse the event inherited 4902 * from Monitor. 4903 */ 4904 4905 4906 void Parker::park(bool isAbsolute, jlong time) { 4907 guarantee(_ParkEvent != NULL, "invariant"); 4908 // First, demultiplex/decode time arguments 4909 if (time < 0) { // don't wait 4910 return; 4911 } 4912 else if (time == 0 && !isAbsolute) { 4913 time = INFINITE; 4914 } 4915 else if (isAbsolute) { 4916 time -= os::javaTimeMillis(); // convert to relative time 4917 if (time <= 0) // already elapsed 4918 return; 4919 } 4920 else { // relative 4921 time /= 1000000; // Must coarsen from nanos to millis 4922 if (time == 0) // Wait for the minimal time unit if zero 4923 time = 1; 4924 } 4925 4926 JavaThread* thread = (JavaThread*)(Thread::current()); 4927 assert(thread->is_Java_thread(), "Must be JavaThread"); 4928 JavaThread *jt = (JavaThread *)thread; 4929 4930 // Don't wait if interrupted or already triggered 4931 if (Thread::is_interrupted(thread, false) || 4932 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 4933 ResetEvent(_ParkEvent); 4934 return; 4935 } 4936 else { 4937 ThreadBlockInVM tbivm(jt); 4938 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4939 jt->set_suspend_equivalent(); 4940 4941 WaitForSingleObject(_ParkEvent, time); 4942 ResetEvent(_ParkEvent); 4943 4944 // If externally suspended while waiting, re-suspend 4945 if (jt->handle_special_suspend_equivalent_condition()) { 4946 jt->java_suspend_self(); 4947 } 4948 } 4949 } 4950 4951 void Parker::unpark() { 4952 guarantee(_ParkEvent != NULL, "invariant"); 4953 SetEvent(_ParkEvent); 4954 } 4955 4956 // Run the specified command in a separate process. Return its exit value, 4957 // or -1 on failure (e.g. can't create a new process). 4958 int os::fork_and_exec(char* cmd) { 4959 STARTUPINFO si; 4960 PROCESS_INFORMATION pi; 4961 4962 memset(&si, 0, sizeof(si)); 4963 si.cb = sizeof(si); 4964 memset(&pi, 0, sizeof(pi)); 4965 BOOL rslt = CreateProcess(NULL, // executable name - use command line 4966 cmd, // command line 4967 NULL, // process security attribute 4968 NULL, // thread security attribute 4969 TRUE, // inherits system handles 4970 0, // no creation flags 4971 NULL, // use parent's environment block 4972 NULL, // use parent's starting directory 4973 &si, // (in) startup information 4974 &pi); // (out) process information 4975 4976 if (rslt) { 4977 // Wait until child process exits. 4978 WaitForSingleObject(pi.hProcess, INFINITE); 4979 4980 DWORD exit_code; 4981 GetExitCodeProcess(pi.hProcess, &exit_code); 4982 4983 // Close process and thread handles. 4984 CloseHandle(pi.hProcess); 4985 CloseHandle(pi.hThread); 4986 4987 return (int)exit_code; 4988 } else { 4989 return -1; 4990 } 4991 } 4992 4993 //-------------------------------------------------------------------------------------------------- 4994 // Non-product code 4995 4996 static int mallocDebugIntervalCounter = 0; 4997 static int mallocDebugCounter = 0; 4998 bool os::check_heap(bool force) { 4999 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 5000 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 5001 // Note: HeapValidate executes two hardware breakpoints when it finds something 5002 // wrong; at these points, eax contains the address of the offending block (I think). 5003 // To get to the exlicit error message(s) below, just continue twice. 5004 HANDLE heap = GetProcessHeap(); 5005 5006 // If we fail to lock the heap, then gflags.exe has been used 5007 // or some other special heap flag has been set that prevents 5008 // locking. We don't try to walk a heap we can't lock. 5009 if (HeapLock(heap) != 0) { 5010 PROCESS_HEAP_ENTRY phe; 5011 phe.lpData = NULL; 5012 while (HeapWalk(heap, &phe) != 0) { 5013 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 5014 !HeapValidate(heap, 0, phe.lpData)) { 5015 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 5016 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 5017 fatal("corrupted C heap"); 5018 } 5019 } 5020 DWORD err = GetLastError(); 5021 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 5022 fatal(err_msg("heap walk aborted with error %d", err)); 5023 } 5024 HeapUnlock(heap); 5025 } 5026 mallocDebugIntervalCounter = 0; 5027 } 5028 return true; 5029 } 5030 5031 5032 bool os::find(address addr, outputStream* st) { 5033 // Nothing yet 5034 return false; 5035 } 5036 5037 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 5038 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 5039 5040 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 5041 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow(); 5042 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 5043 address addr = (address) exceptionRecord->ExceptionInformation[1]; 5044 5045 if (os::is_memory_serialize_page(thread, addr)) 5046 return EXCEPTION_CONTINUE_EXECUTION; 5047 } 5048 5049 return EXCEPTION_CONTINUE_SEARCH; 5050 } 5051 5052 // We don't build a headless jre for Windows 5053 bool os::is_headless_jre() { return false; } 5054 5055 static jint initSock() { 5056 WSADATA wsadata; 5057 5058 if (!os::WinSock2Dll::WinSock2Available()) { 5059 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n", 5060 ::GetLastError()); 5061 return JNI_ERR; 5062 } 5063 5064 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) { 5065 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n", 5066 ::GetLastError()); 5067 return JNI_ERR; 5068 } 5069 return JNI_OK; 5070 } 5071 5072 struct hostent* os::get_host_by_name(char* name) { 5073 return (struct hostent*)os::WinSock2Dll::gethostbyname(name); 5074 } 5075 5076 int os::socket_close(int fd) { 5077 return ::closesocket(fd); 5078 } 5079 5080 int os::socket_available(int fd, jint *pbytes) { 5081 int ret = ::ioctlsocket(fd, FIONREAD, (u_long*)pbytes); 5082 return (ret < 0) ? 0 : 1; 5083 } 5084 5085 int os::socket(int domain, int type, int protocol) { 5086 return ::socket(domain, type, protocol); 5087 } 5088 5089 int os::listen(int fd, int count) { 5090 return ::listen(fd, count); 5091 } 5092 5093 int os::connect(int fd, struct sockaddr* him, socklen_t len) { 5094 return ::connect(fd, him, len); 5095 } 5096 5097 int os::accept(int fd, struct sockaddr* him, socklen_t* len) { 5098 return ::accept(fd, him, len); 5099 } 5100 5101 int os::sendto(int fd, char* buf, size_t len, uint flags, 5102 struct sockaddr* to, socklen_t tolen) { 5103 5104 return ::sendto(fd, buf, (int)len, flags, to, tolen); 5105 } 5106 5107 int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags, 5108 sockaddr* from, socklen_t* fromlen) { 5109 5110 return ::recvfrom(fd, buf, (int)nBytes, flags, from, fromlen); 5111 } 5112 5113 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5114 return ::recv(fd, buf, (int)nBytes, flags); 5115 } 5116 5117 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5118 return ::send(fd, buf, (int)nBytes, flags); 5119 } 5120 5121 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5122 return ::send(fd, buf, (int)nBytes, flags); 5123 } 5124 5125 int os::timeout(int fd, long timeout) { 5126 fd_set tbl; 5127 struct timeval t; 5128 5129 t.tv_sec = timeout / 1000; 5130 t.tv_usec = (timeout % 1000) * 1000; 5131 5132 tbl.fd_count = 1; 5133 tbl.fd_array[0] = fd; 5134 5135 return ::select(1, &tbl, 0, 0, &t); 5136 } 5137 5138 int os::get_host_name(char* name, int namelen) { 5139 return ::gethostname(name, namelen); 5140 } 5141 5142 int os::socket_shutdown(int fd, int howto) { 5143 return ::shutdown(fd, howto); 5144 } 5145 5146 int os::bind(int fd, struct sockaddr* him, socklen_t len) { 5147 return ::bind(fd, him, len); 5148 } 5149 5150 int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) { 5151 return ::getsockname(fd, him, len); 5152 } 5153 5154 int os::get_sock_opt(int fd, int level, int optname, 5155 char* optval, socklen_t* optlen) { 5156 return ::getsockopt(fd, level, optname, optval, optlen); 5157 } 5158 5159 int os::set_sock_opt(int fd, int level, int optname, 5160 const char* optval, socklen_t optlen) { 5161 return ::setsockopt(fd, level, optname, optval, optlen); 5162 } 5163 5164 // WINDOWS CONTEXT Flags for THREAD_SAMPLING 5165 #if defined(IA32) 5166 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS) 5167 #elif defined (AMD64) 5168 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT) 5169 #endif 5170 5171 // returns true if thread could be suspended, 5172 // false otherwise 5173 static bool do_suspend(HANDLE* h) { 5174 if (h != NULL) { 5175 if (SuspendThread(*h) != ~0) { 5176 return true; 5177 } 5178 } 5179 return false; 5180 } 5181 5182 // resume the thread 5183 // calling resume on an active thread is a no-op 5184 static void do_resume(HANDLE* h) { 5185 if (h != NULL) { 5186 ResumeThread(*h); 5187 } 5188 } 5189 5190 // retrieve a suspend/resume context capable handle 5191 // from the tid. Caller validates handle return value. 5192 void get_thread_handle_for_extended_context(HANDLE* h, OSThread::thread_id_t tid) { 5193 if (h != NULL) { 5194 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid); 5195 } 5196 } 5197 5198 // 5199 // Thread sampling implementation 5200 // 5201 void os::SuspendedThreadTask::internal_do_task() { 5202 CONTEXT ctxt; 5203 HANDLE h = NULL; 5204 5205 // get context capable handle for thread 5206 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id()); 5207 5208 // sanity 5209 if (h == NULL || h == INVALID_HANDLE_VALUE) { 5210 return; 5211 } 5212 5213 // suspend the thread 5214 if (do_suspend(&h)) { 5215 ctxt.ContextFlags = sampling_context_flags; 5216 // get thread context 5217 GetThreadContext(h, &ctxt); 5218 SuspendedThreadTaskContext context(_thread, &ctxt); 5219 // pass context to Thread Sampling impl 5220 do_task(context); 5221 // resume thread 5222 do_resume(&h); 5223 } 5224 5225 // close handle 5226 CloseHandle(h); 5227 } 5228 5229 5230 // Kernel32 API 5231 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void); 5232 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD); 5233 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG); 5234 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG); 5235 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG); 5236 5237 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL; 5238 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL; 5239 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL; 5240 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL; 5241 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL; 5242 5243 5244 BOOL os::Kernel32Dll::initialized = FALSE; 5245 SIZE_T os::Kernel32Dll::GetLargePageMinimum() { 5246 assert(initialized && _GetLargePageMinimum != NULL, 5247 "GetLargePageMinimumAvailable() not yet called"); 5248 return _GetLargePageMinimum(); 5249 } 5250 5251 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() { 5252 if (!initialized) { 5253 initialize(); 5254 } 5255 return _GetLargePageMinimum != NULL; 5256 } 5257 5258 BOOL os::Kernel32Dll::NumaCallsAvailable() { 5259 if (!initialized) { 5260 initialize(); 5261 } 5262 return _VirtualAllocExNuma != NULL; 5263 } 5264 5265 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) { 5266 assert(initialized && _VirtualAllocExNuma != NULL, 5267 "NUMACallsAvailable() not yet called"); 5268 5269 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node); 5270 } 5271 5272 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) { 5273 assert(initialized && _GetNumaHighestNodeNumber != NULL, 5274 "NUMACallsAvailable() not yet called"); 5275 5276 return _GetNumaHighestNodeNumber(ptr_highest_node_number); 5277 } 5278 5279 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) { 5280 assert(initialized && _GetNumaNodeProcessorMask != NULL, 5281 "NUMACallsAvailable() not yet called"); 5282 5283 return _GetNumaNodeProcessorMask(node, proc_mask); 5284 } 5285 5286 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip, 5287 ULONG FrameToCapture, PVOID* BackTrace, PULONG BackTraceHash) { 5288 if (!initialized) { 5289 initialize(); 5290 } 5291 5292 if (_RtlCaptureStackBackTrace != NULL) { 5293 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture, 5294 BackTrace, BackTraceHash); 5295 } else { 5296 return 0; 5297 } 5298 } 5299 5300 void os::Kernel32Dll::initializeCommon() { 5301 if (!initialized) { 5302 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5303 assert(handle != NULL, "Just check"); 5304 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum"); 5305 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma"); 5306 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber"); 5307 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask"); 5308 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace"); 5309 initialized = TRUE; 5310 } 5311 } 5312 5313 5314 5315 #ifndef JDK6_OR_EARLIER 5316 5317 void os::Kernel32Dll::initialize() { 5318 initializeCommon(); 5319 } 5320 5321 5322 // Kernel32 API 5323 inline BOOL os::Kernel32Dll::SwitchToThread() { 5324 return ::SwitchToThread(); 5325 } 5326 5327 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5328 return true; 5329 } 5330 5331 // Help tools 5332 inline BOOL os::Kernel32Dll::HelpToolsAvailable() { 5333 return true; 5334 } 5335 5336 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) { 5337 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5338 } 5339 5340 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5341 return ::Module32First(hSnapshot, lpme); 5342 } 5343 5344 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5345 return ::Module32Next(hSnapshot, lpme); 5346 } 5347 5348 5349 inline BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() { 5350 return true; 5351 } 5352 5353 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5354 ::GetNativeSystemInfo(lpSystemInfo); 5355 } 5356 5357 // PSAPI API 5358 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) { 5359 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5360 } 5361 5362 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) { 5363 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5364 } 5365 5366 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) { 5367 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5368 } 5369 5370 inline BOOL os::PSApiDll::PSApiAvailable() { 5371 return true; 5372 } 5373 5374 5375 // WinSock2 API 5376 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) { 5377 return ::WSAStartup(wVersionRequested, lpWSAData); 5378 } 5379 5380 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5381 return ::gethostbyname(name); 5382 } 5383 5384 inline BOOL os::WinSock2Dll::WinSock2Available() { 5385 return true; 5386 } 5387 5388 // Advapi API 5389 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5390 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength, 5391 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) { 5392 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5393 BufferLength, PreviousState, ReturnLength); 5394 } 5395 5396 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess, 5397 PHANDLE TokenHandle) { 5398 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5399 } 5400 5401 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) { 5402 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5403 } 5404 5405 inline BOOL os::Advapi32Dll::AdvapiAvailable() { 5406 return true; 5407 } 5408 5409 void* os::get_default_process_handle() { 5410 return (void*)GetModuleHandle(NULL); 5411 } 5412 5413 // Builds a platform dependent Agent_OnLoad_<lib_name> function name 5414 // which is used to find statically linked in agents. 5415 // Additionally for windows, takes into account __stdcall names. 5416 // Parameters: 5417 // sym_name: Symbol in library we are looking for 5418 // lib_name: Name of library to look in, NULL for shared libs. 5419 // is_absolute_path == true if lib_name is absolute path to agent 5420 // such as "C:/a/b/L.dll" 5421 // == false if only the base name of the library is passed in 5422 // such as "L" 5423 char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 5424 bool is_absolute_path) { 5425 char *agent_entry_name; 5426 size_t len; 5427 size_t name_len; 5428 size_t prefix_len = strlen(JNI_LIB_PREFIX); 5429 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 5430 const char *start; 5431 5432 if (lib_name != NULL) { 5433 len = name_len = strlen(lib_name); 5434 if (is_absolute_path) { 5435 // Need to strip path, prefix and suffix 5436 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 5437 lib_name = ++start; 5438 } else { 5439 // Need to check for drive prefix 5440 if ((start = strchr(lib_name, ':')) != NULL) { 5441 lib_name = ++start; 5442 } 5443 } 5444 if (len <= (prefix_len + suffix_len)) { 5445 return NULL; 5446 } 5447 lib_name += prefix_len; 5448 name_len = strlen(lib_name) - suffix_len; 5449 } 5450 } 5451 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 5452 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 5453 if (agent_entry_name == NULL) { 5454 return NULL; 5455 } 5456 if (lib_name != NULL) { 5457 const char *p = strrchr(sym_name, '@'); 5458 if (p != NULL && p != sym_name) { 5459 // sym_name == _Agent_OnLoad@XX 5460 strncpy(agent_entry_name, sym_name, (p - sym_name)); 5461 agent_entry_name[(p-sym_name)] = '\0'; 5462 // agent_entry_name == _Agent_OnLoad 5463 strcat(agent_entry_name, "_"); 5464 strncat(agent_entry_name, lib_name, name_len); 5465 strcat(agent_entry_name, p); 5466 // agent_entry_name == _Agent_OnLoad_lib_name@XX 5467 } else { 5468 strcpy(agent_entry_name, sym_name); 5469 strcat(agent_entry_name, "_"); 5470 strncat(agent_entry_name, lib_name, name_len); 5471 } 5472 } else { 5473 strcpy(agent_entry_name, sym_name); 5474 } 5475 return agent_entry_name; 5476 } 5477 5478 #else 5479 // Kernel32 API 5480 typedef BOOL (WINAPI* SwitchToThread_Fn)(void); 5481 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD); 5482 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32); 5483 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32); 5484 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO); 5485 5486 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL; 5487 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL; 5488 Module32First_Fn os::Kernel32Dll::_Module32First = NULL; 5489 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL; 5490 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL; 5491 5492 void os::Kernel32Dll::initialize() { 5493 if (!initialized) { 5494 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5495 assert(handle != NULL, "Just check"); 5496 5497 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread"); 5498 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn) 5499 ::GetProcAddress(handle, "CreateToolhelp32Snapshot"); 5500 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First"); 5501 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next"); 5502 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo"); 5503 initializeCommon(); // resolve the functions that always need resolving 5504 5505 initialized = TRUE; 5506 } 5507 } 5508 5509 BOOL os::Kernel32Dll::SwitchToThread() { 5510 assert(initialized && _SwitchToThread != NULL, 5511 "SwitchToThreadAvailable() not yet called"); 5512 return _SwitchToThread(); 5513 } 5514 5515 5516 BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5517 if (!initialized) { 5518 initialize(); 5519 } 5520 return _SwitchToThread != NULL; 5521 } 5522 5523 // Help tools 5524 BOOL os::Kernel32Dll::HelpToolsAvailable() { 5525 if (!initialized) { 5526 initialize(); 5527 } 5528 return _CreateToolhelp32Snapshot != NULL && 5529 _Module32First != NULL && 5530 _Module32Next != NULL; 5531 } 5532 5533 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) { 5534 assert(initialized && _CreateToolhelp32Snapshot != NULL, 5535 "HelpToolsAvailable() not yet called"); 5536 5537 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5538 } 5539 5540 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5541 assert(initialized && _Module32First != NULL, 5542 "HelpToolsAvailable() not yet called"); 5543 5544 return _Module32First(hSnapshot, lpme); 5545 } 5546 5547 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5548 assert(initialized && _Module32Next != NULL, 5549 "HelpToolsAvailable() not yet called"); 5550 5551 return _Module32Next(hSnapshot, lpme); 5552 } 5553 5554 5555 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() { 5556 if (!initialized) { 5557 initialize(); 5558 } 5559 return _GetNativeSystemInfo != NULL; 5560 } 5561 5562 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5563 assert(initialized && _GetNativeSystemInfo != NULL, 5564 "GetNativeSystemInfoAvailable() not yet called"); 5565 5566 _GetNativeSystemInfo(lpSystemInfo); 5567 } 5568 5569 // PSAPI API 5570 5571 5572 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD); 5573 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);; 5574 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD); 5575 5576 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL; 5577 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL; 5578 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL; 5579 BOOL os::PSApiDll::initialized = FALSE; 5580 5581 void os::PSApiDll::initialize() { 5582 if (!initialized) { 5583 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0); 5584 if (handle != NULL) { 5585 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle, 5586 "EnumProcessModules"); 5587 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle, 5588 "GetModuleFileNameExA"); 5589 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle, 5590 "GetModuleInformation"); 5591 } 5592 initialized = TRUE; 5593 } 5594 } 5595 5596 5597 5598 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) { 5599 assert(initialized && _EnumProcessModules != NULL, 5600 "PSApiAvailable() not yet called"); 5601 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5602 } 5603 5604 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) { 5605 assert(initialized && _GetModuleFileNameEx != NULL, 5606 "PSApiAvailable() not yet called"); 5607 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5608 } 5609 5610 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) { 5611 assert(initialized && _GetModuleInformation != NULL, 5612 "PSApiAvailable() not yet called"); 5613 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5614 } 5615 5616 BOOL os::PSApiDll::PSApiAvailable() { 5617 if (!initialized) { 5618 initialize(); 5619 } 5620 return _EnumProcessModules != NULL && 5621 _GetModuleFileNameEx != NULL && 5622 _GetModuleInformation != NULL; 5623 } 5624 5625 5626 // WinSock2 API 5627 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA); 5628 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...); 5629 5630 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL; 5631 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL; 5632 BOOL os::WinSock2Dll::initialized = FALSE; 5633 5634 void os::WinSock2Dll::initialize() { 5635 if (!initialized) { 5636 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0); 5637 if (handle != NULL) { 5638 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup"); 5639 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname"); 5640 } 5641 initialized = TRUE; 5642 } 5643 } 5644 5645 5646 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) { 5647 assert(initialized && _WSAStartup != NULL, 5648 "WinSock2Available() not yet called"); 5649 return _WSAStartup(wVersionRequested, lpWSAData); 5650 } 5651 5652 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5653 assert(initialized && _gethostbyname != NULL, 5654 "WinSock2Available() not yet called"); 5655 return _gethostbyname(name); 5656 } 5657 5658 BOOL os::WinSock2Dll::WinSock2Available() { 5659 if (!initialized) { 5660 initialize(); 5661 } 5662 return _WSAStartup != NULL && 5663 _gethostbyname != NULL; 5664 } 5665 5666 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 5667 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE); 5668 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID); 5669 5670 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL; 5671 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL; 5672 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL; 5673 BOOL os::Advapi32Dll::initialized = FALSE; 5674 5675 void os::Advapi32Dll::initialize() { 5676 if (!initialized) { 5677 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0); 5678 if (handle != NULL) { 5679 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle, 5680 "AdjustTokenPrivileges"); 5681 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle, 5682 "OpenProcessToken"); 5683 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle, 5684 "LookupPrivilegeValueA"); 5685 } 5686 initialized = TRUE; 5687 } 5688 } 5689 5690 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5691 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength, 5692 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) { 5693 assert(initialized && _AdjustTokenPrivileges != NULL, 5694 "AdvapiAvailable() not yet called"); 5695 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5696 BufferLength, PreviousState, ReturnLength); 5697 } 5698 5699 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess, 5700 PHANDLE TokenHandle) { 5701 assert(initialized && _OpenProcessToken != NULL, 5702 "AdvapiAvailable() not yet called"); 5703 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5704 } 5705 5706 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) { 5707 assert(initialized && _LookupPrivilegeValue != NULL, 5708 "AdvapiAvailable() not yet called"); 5709 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5710 } 5711 5712 BOOL os::Advapi32Dll::AdvapiAvailable() { 5713 if (!initialized) { 5714 initialize(); 5715 } 5716 return _AdjustTokenPrivileges != NULL && 5717 _OpenProcessToken != NULL && 5718 _LookupPrivilegeValue != NULL; 5719 } 5720 5721 #endif 5722 5723 #ifndef PRODUCT 5724 5725 // test the code path in reserve_memory_special() that tries to allocate memory in a single 5726 // contiguous memory block at a particular address. 5727 // The test first tries to find a good approximate address to allocate at by using the same 5728 // method to allocate some memory at any address. The test then tries to allocate memory in 5729 // the vicinity (not directly after it to avoid possible by-chance use of that location) 5730 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of 5731 // the previously allocated memory is available for allocation. The only actual failure 5732 // that is reported is when the test tries to allocate at a particular location but gets a 5733 // different valid one. A NULL return value at this point is not considered an error but may 5734 // be legitimate. 5735 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages. 5736 void TestReserveMemorySpecial_test() { 5737 if (!UseLargePages) { 5738 if (VerboseInternalVMTests) { 5739 gclog_or_tty->print("Skipping test because large pages are disabled"); 5740 } 5741 return; 5742 } 5743 // save current value of globals 5744 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; 5745 bool old_use_numa_interleaving = UseNUMAInterleaving; 5746 5747 // set globals to make sure we hit the correct code path 5748 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; 5749 5750 // do an allocation at an address selected by the OS to get a good one. 5751 const size_t large_allocation_size = os::large_page_size() * 4; 5752 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); 5753 if (result == NULL) { 5754 if (VerboseInternalVMTests) { 5755 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.", 5756 large_allocation_size); 5757 } 5758 } else { 5759 os::release_memory_special(result, large_allocation_size); 5760 5761 // allocate another page within the recently allocated memory area which seems to be a good location. At least 5762 // we managed to get it once. 5763 const size_t expected_allocation_size = os::large_page_size(); 5764 char* expected_location = result + os::large_page_size(); 5765 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); 5766 if (actual_location == NULL) { 5767 if (VerboseInternalVMTests) { 5768 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.", 5769 expected_location, large_allocation_size); 5770 } 5771 } else { 5772 // release memory 5773 os::release_memory_special(actual_location, expected_allocation_size); 5774 // only now check, after releasing any memory to avoid any leaks. 5775 assert(actual_location == expected_location, 5776 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead", 5777 expected_location, expected_allocation_size, actual_location)); 5778 } 5779 } 5780 5781 // restore globals 5782 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; 5783 UseNUMAInterleaving = old_use_numa_interleaving; 5784 } 5785 #endif // PRODUCT 5786