os_windows.cpp revision 7344:1d29b13e8a51
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 Vista or Server 2008 to use InitOnceExecuteOnce 26#define _WIN32_WINNT 0x0600 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 "runtime/vm_version.hpp" 66#include "services/attachListener.hpp" 67#include "services/memTracker.hpp" 68#include "services/runtimeService.hpp" 69#include "utilities/decoder.hpp" 70#include "utilities/defaultStream.hpp" 71#include "utilities/events.hpp" 72#include "utilities/growableArray.hpp" 73#include "utilities/vmError.hpp" 74 75#ifdef _DEBUG 76#include <crtdbg.h> 77#endif 78 79 80#include <windows.h> 81#include <sys/types.h> 82#include <sys/stat.h> 83#include <sys/timeb.h> 84#include <objidl.h> 85#include <shlobj.h> 86 87#include <malloc.h> 88#include <signal.h> 89#include <direct.h> 90#include <errno.h> 91#include <fcntl.h> 92#include <io.h> 93#include <process.h> // For _beginthreadex(), _endthreadex() 94#include <imagehlp.h> // For os::dll_address_to_function_name 95// for enumerating dll libraries 96#include <vdmdbg.h> 97 98// for timer info max values which include all bits 99#define ALL_64_BITS CONST64(-1) 100 101// For DLL loading/load error detection 102// Values of PE COFF 103#define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c 104#define IMAGE_FILE_SIGNATURE_LENGTH 4 105 106static HANDLE main_process; 107static HANDLE main_thread; 108static int main_thread_id; 109 110static FILETIME process_creation_time; 111static FILETIME process_exit_time; 112static FILETIME process_user_time; 113static FILETIME process_kernel_time; 114 115#ifdef _M_IA64 116 #define __CPU__ ia64 117#elif _M_AMD64 118 #define __CPU__ amd64 119#else 120 #define __CPU__ i486 121#endif 122 123// save DLL module handle, used by GetModuleFileName 124 125HINSTANCE vm_lib_handle; 126 127BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { 128 switch (reason) { 129 case DLL_PROCESS_ATTACH: 130 vm_lib_handle = hinst; 131 if (ForceTimeHighResolution) { 132 timeBeginPeriod(1L); 133 } 134 break; 135 case DLL_PROCESS_DETACH: 136 if (ForceTimeHighResolution) { 137 timeEndPeriod(1L); 138 } 139 break; 140 default: 141 break; 142 } 143 return true; 144} 145 146static inline double fileTimeAsDouble(FILETIME* time) { 147 const double high = (double) ((unsigned int) ~0); 148 const double split = 10000000.0; 149 double result = (time->dwLowDateTime / split) + 150 time->dwHighDateTime * (high/split); 151 return result; 152} 153 154// Implementation of os 155 156bool os::getenv(const char* name, char* buffer, int len) { 157 int result = GetEnvironmentVariable(name, buffer, len); 158 return result > 0 && result < len; 159} 160 161bool os::unsetenv(const char* name) { 162 assert(name != NULL, "Null pointer"); 163 return (SetEnvironmentVariable(name, NULL) == TRUE); 164} 165 166// No setuid programs under Windows. 167bool 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 175void os::run_periodic_checks() { 176 return; 177} 178 179// previous UnhandledExceptionFilter, if there is one 180static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL; 181 182LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 183 184void os::init_system_properties_values() { 185 // sysclasspath, java_home, dll_dir 186 { 187 char *home_path; 188 char *dll_path; 189 char *pslash; 190 char *bin = "\\bin"; 191 char home_dir[MAX_PATH]; 192 193 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) { 194 os::jvm_path(home_dir, sizeof(home_dir)); 195 // Found the full path to jvm.dll. 196 // Now cut the path to <java_home>/jre if we can. 197 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll 198 pslash = strrchr(home_dir, '\\'); 199 if (pslash != NULL) { 200 *pslash = '\0'; // get rid of \{client|server} 201 pslash = strrchr(home_dir, '\\'); 202 if (pslash != NULL) { 203 *pslash = '\0'; // get rid of \bin 204 } 205 } 206 } 207 208 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal); 209 if (home_path == NULL) { 210 return; 211 } 212 strcpy(home_path, home_dir); 213 Arguments::set_java_home(home_path); 214 FREE_C_HEAP_ARRAY(char, home_path, mtInternal); 215 216 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, 217 mtInternal); 218 if (dll_path == NULL) { 219 return; 220 } 221 strcpy(dll_path, home_dir); 222 strcat(dll_path, bin); 223 Arguments::set_dll_dir(dll_path); 224 FREE_C_HEAP_ARRAY(char, dll_path, mtInternal); 225 226 if (!set_boot_path('\\', ';')) { 227 return; 228 } 229 } 230 231// library_path 232#define EXT_DIR "\\lib\\ext" 233#define BIN_DIR "\\bin" 234#define PACKAGE_DIR "\\Sun\\Java" 235 { 236 // Win32 library search order (See the documentation for LoadLibrary): 237 // 238 // 1. The directory from which application is loaded. 239 // 2. The system wide Java Extensions directory (Java only) 240 // 3. System directory (GetSystemDirectory) 241 // 4. Windows directory (GetWindowsDirectory) 242 // 5. The PATH environment variable 243 // 6. The current directory 244 245 char *library_path; 246 char tmp[MAX_PATH]; 247 char *path_str = ::getenv("PATH"); 248 249 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 250 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal); 251 252 library_path[0] = '\0'; 253 254 GetModuleFileName(NULL, tmp, sizeof(tmp)); 255 *(strrchr(tmp, '\\')) = '\0'; 256 strcat(library_path, tmp); 257 258 GetWindowsDirectory(tmp, sizeof(tmp)); 259 strcat(library_path, ";"); 260 strcat(library_path, tmp); 261 strcat(library_path, PACKAGE_DIR BIN_DIR); 262 263 GetSystemDirectory(tmp, sizeof(tmp)); 264 strcat(library_path, ";"); 265 strcat(library_path, tmp); 266 267 GetWindowsDirectory(tmp, sizeof(tmp)); 268 strcat(library_path, ";"); 269 strcat(library_path, tmp); 270 271 if (path_str) { 272 strcat(library_path, ";"); 273 strcat(library_path, path_str); 274 } 275 276 strcat(library_path, ";."); 277 278 Arguments::set_library_path(library_path); 279 FREE_C_HEAP_ARRAY(char, library_path, mtInternal); 280 } 281 282 // Default extensions directory 283 { 284 char path[MAX_PATH]; 285 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 286 GetWindowsDirectory(path, MAX_PATH); 287 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 288 path, PACKAGE_DIR, EXT_DIR); 289 Arguments::set_ext_dirs(buf); 290 } 291 #undef EXT_DIR 292 #undef BIN_DIR 293 #undef PACKAGE_DIR 294 295#ifndef _WIN64 296 // set our UnhandledExceptionFilter and save any previous one 297 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception); 298#endif 299 300 // Done 301 return; 302} 303 304void os::breakpoint() { 305 DebugBreak(); 306} 307 308// Invoked from the BREAKPOINT Macro 309extern "C" void breakpoint() { 310 os::breakpoint(); 311} 312 313// RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP. 314// So far, this method is only used by Native Memory Tracking, which is 315// only supported on Windows XP or later. 316// 317int os::get_native_stack(address* stack, int frames, int toSkip) { 318#ifdef _NMT_NOINLINE_ 319 toSkip++; 320#endif 321 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames, 322 (PVOID*)stack, NULL); 323 for (int index = captured; index < frames; index ++) { 324 stack[index] = NULL; 325 } 326 return captured; 327} 328 329 330// os::current_stack_base() 331// 332// Returns the base of the stack, which is the stack's 333// starting address. This function must be called 334// while running on the stack of the thread being queried. 335 336address os::current_stack_base() { 337 MEMORY_BASIC_INFORMATION minfo; 338 address stack_bottom; 339 size_t stack_size; 340 341 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 342 stack_bottom = (address)minfo.AllocationBase; 343 stack_size = minfo.RegionSize; 344 345 // Add up the sizes of all the regions with the same 346 // AllocationBase. 347 while (1) { 348 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 349 if (stack_bottom == (address)minfo.AllocationBase) { 350 stack_size += minfo.RegionSize; 351 } else { 352 break; 353 } 354 } 355 356#ifdef _M_IA64 357 // IA64 has memory and register stacks 358 // 359 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit 360 // at thread creation (1MB backing store growing upwards, 1MB memory stack 361 // growing downwards, 2MB summed up) 362 // 363 // ... 364 // ------- top of stack (high address) ----- 365 // | 366 // | 1MB 367 // | Backing Store (Register Stack) 368 // | 369 // | / \ 370 // | | 371 // | | 372 // | | 373 // ------------------------ stack base ----- 374 // | 1MB 375 // | Memory Stack 376 // | 377 // | | 378 // | | 379 // | | 380 // | \ / 381 // | 382 // ----- bottom of stack (low address) ----- 383 // ... 384 385 stack_size = stack_size / 2; 386#endif 387 return stack_bottom + stack_size; 388} 389 390size_t os::current_stack_size() { 391 size_t sz; 392 MEMORY_BASIC_INFORMATION minfo; 393 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 394 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 395 return sz; 396} 397 398struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 399 const struct tm* time_struct_ptr = localtime(clock); 400 if (time_struct_ptr != NULL) { 401 *res = *time_struct_ptr; 402 return res; 403 } 404 return NULL; 405} 406 407LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 408 409// Thread start routine for all new Java threads 410static unsigned __stdcall java_start(Thread* thread) { 411 // Try to randomize the cache line index of hot stack frames. 412 // This helps when threads of the same stack traces evict each other's 413 // cache lines. The threads can be either from the same JVM instance, or 414 // from different JVM instances. The benefit is especially true for 415 // processors with hyperthreading technology. 416 static int counter = 0; 417 int pid = os::current_process_id(); 418 _alloca(((pid ^ counter++) & 7) * 128); 419 420 OSThread* osthr = thread->osthread(); 421 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 422 423 if (UseNUMA) { 424 int lgrp_id = os::numa_get_group_id(); 425 if (lgrp_id != -1) { 426 thread->set_lgrp_id(lgrp_id); 427 } 428 } 429 430 // Diagnostic code to investigate JDK-6573254 431 int res = 50115; // non-java thread 432 if (thread->is_Java_thread()) { 433 res = 40115; // java thread 434 } 435 436 // Install a win32 structured exception handler around every thread created 437 // by VM, so VM can generate error dump when an exception occurred in non- 438 // Java thread (e.g. VM thread). 439 __try { 440 thread->run(); 441 } __except(topLevelExceptionFilter( 442 (_EXCEPTION_POINTERS*)_exception_info())) { 443 // Nothing to do. 444 } 445 446 // One less thread is executing 447 // When the VMThread gets here, the main thread may have already exited 448 // which frees the CodeHeap containing the Atomic::add code 449 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 450 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); 451 } 452 453 // Thread must not return from exit_process_or_thread(), but if it does, 454 // let it proceed to exit normally 455 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res); 456} 457 458static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, 459 int thread_id) { 460 // Allocate the OSThread object 461 OSThread* osthread = new OSThread(NULL, NULL); 462 if (osthread == NULL) return NULL; 463 464 // Initialize support for Java interrupts 465 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 466 if (interrupt_event == NULL) { 467 delete osthread; 468 return NULL; 469 } 470 osthread->set_interrupt_event(interrupt_event); 471 472 // Store info on the Win32 thread into the OSThread 473 osthread->set_thread_handle(thread_handle); 474 osthread->set_thread_id(thread_id); 475 476 if (UseNUMA) { 477 int lgrp_id = os::numa_get_group_id(); 478 if (lgrp_id != -1) { 479 thread->set_lgrp_id(lgrp_id); 480 } 481 } 482 483 // Initial thread state is INITIALIZED, not SUSPENDED 484 osthread->set_state(INITIALIZED); 485 486 return osthread; 487} 488 489 490bool os::create_attached_thread(JavaThread* thread) { 491#ifdef ASSERT 492 thread->verify_not_published(); 493#endif 494 HANDLE thread_h; 495 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 496 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 497 fatal("DuplicateHandle failed\n"); 498 } 499 OSThread* osthread = create_os_thread(thread, thread_h, 500 (int)current_thread_id()); 501 if (osthread == NULL) { 502 return false; 503 } 504 505 // Initial thread state is RUNNABLE 506 osthread->set_state(RUNNABLE); 507 508 thread->set_osthread(osthread); 509 return true; 510} 511 512bool os::create_main_thread(JavaThread* thread) { 513#ifdef ASSERT 514 thread->verify_not_published(); 515#endif 516 if (_starting_thread == NULL) { 517 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 518 if (_starting_thread == NULL) { 519 return false; 520 } 521 } 522 523 // The primordial thread is runnable from the start) 524 _starting_thread->set_state(RUNNABLE); 525 526 thread->set_osthread(_starting_thread); 527 return true; 528} 529 530// Allocate and initialize a new OSThread 531bool os::create_thread(Thread* thread, ThreadType thr_type, 532 size_t stack_size) { 533 unsigned thread_id; 534 535 // Allocate the OSThread object 536 OSThread* osthread = new OSThread(NULL, NULL); 537 if (osthread == NULL) { 538 return false; 539 } 540 541 // Initialize support for Java interrupts 542 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 543 if (interrupt_event == NULL) { 544 delete osthread; 545 return NULL; 546 } 547 osthread->set_interrupt_event(interrupt_event); 548 osthread->set_interrupted(false); 549 550 thread->set_osthread(osthread); 551 552 if (stack_size == 0) { 553 switch (thr_type) { 554 case os::java_thread: 555 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 556 if (JavaThread::stack_size_at_create() > 0) { 557 stack_size = JavaThread::stack_size_at_create(); 558 } 559 break; 560 case os::compiler_thread: 561 if (CompilerThreadStackSize > 0) { 562 stack_size = (size_t)(CompilerThreadStackSize * K); 563 break; 564 } // else fall through: 565 // use VMThreadStackSize if CompilerThreadStackSize is not defined 566 case os::vm_thread: 567 case os::pgc_thread: 568 case os::cgc_thread: 569 case os::watcher_thread: 570 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 571 break; 572 } 573 } 574 575 // Create the Win32 thread 576 // 577 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 578 // does not specify stack size. Instead, it specifies the size of 579 // initially committed space. The stack size is determined by 580 // PE header in the executable. If the committed "stack_size" is larger 581 // than default value in the PE header, the stack is rounded up to the 582 // nearest multiple of 1MB. For example if the launcher has default 583 // stack size of 320k, specifying any size less than 320k does not 584 // affect the actual stack size at all, it only affects the initial 585 // commitment. On the other hand, specifying 'stack_size' larger than 586 // default value may cause significant increase in memory usage, because 587 // not only the stack space will be rounded up to MB, but also the 588 // entire space is committed upfront. 589 // 590 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 591 // for CreateThread() that can treat 'stack_size' as stack size. However we 592 // are not supposed to call CreateThread() directly according to MSDN 593 // document because JVM uses C runtime library. The good news is that the 594 // flag appears to work with _beginthredex() as well. 595 596#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION 597 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000) 598#endif 599 600 HANDLE thread_handle = 601 (HANDLE)_beginthreadex(NULL, 602 (unsigned)stack_size, 603 (unsigned (__stdcall *)(void*)) java_start, 604 thread, 605 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, 606 &thread_id); 607 if (thread_handle == NULL) { 608 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again 609 // without the flag. 610 thread_handle = 611 (HANDLE)_beginthreadex(NULL, 612 (unsigned)stack_size, 613 (unsigned (__stdcall *)(void*)) java_start, 614 thread, 615 CREATE_SUSPENDED, 616 &thread_id); 617 } 618 if (thread_handle == NULL) { 619 // Need to clean up stuff we've allocated so far 620 CloseHandle(osthread->interrupt_event()); 621 thread->set_osthread(NULL); 622 delete osthread; 623 return NULL; 624 } 625 626 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); 627 628 // Store info on the Win32 thread into the OSThread 629 osthread->set_thread_handle(thread_handle); 630 osthread->set_thread_id(thread_id); 631 632 // Initial thread state is INITIALIZED, not SUSPENDED 633 osthread->set_state(INITIALIZED); 634 635 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 636 return true; 637} 638 639 640// Free Win32 resources related to the OSThread 641void os::free_thread(OSThread* osthread) { 642 assert(osthread != NULL, "osthread not set"); 643 CloseHandle(osthread->thread_handle()); 644 CloseHandle(osthread->interrupt_event()); 645 delete osthread; 646} 647 648static jlong first_filetime; 649static jlong initial_performance_count; 650static jlong performance_frequency; 651 652 653jlong as_long(LARGE_INTEGER x) { 654 jlong result = 0; // initialization to avoid warning 655 set_high(&result, x.HighPart); 656 set_low(&result, x.LowPart); 657 return result; 658} 659 660 661jlong os::elapsed_counter() { 662 LARGE_INTEGER count; 663 if (win32::_has_performance_count) { 664 QueryPerformanceCounter(&count); 665 return as_long(count) - initial_performance_count; 666 } else { 667 FILETIME wt; 668 GetSystemTimeAsFileTime(&wt); 669 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime); 670 } 671} 672 673 674jlong os::elapsed_frequency() { 675 if (win32::_has_performance_count) { 676 return performance_frequency; 677 } else { 678 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601. 679 return 10000000; 680 } 681} 682 683 684julong os::available_memory() { 685 return win32::available_memory(); 686} 687 688julong os::win32::available_memory() { 689 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 690 // value if total memory is larger than 4GB 691 MEMORYSTATUSEX ms; 692 ms.dwLength = sizeof(ms); 693 GlobalMemoryStatusEx(&ms); 694 695 return (julong)ms.ullAvailPhys; 696} 697 698julong os::physical_memory() { 699 return win32::physical_memory(); 700} 701 702bool os::has_allocatable_memory_limit(julong* limit) { 703 MEMORYSTATUSEX ms; 704 ms.dwLength = sizeof(ms); 705 GlobalMemoryStatusEx(&ms); 706#ifdef _LP64 707 *limit = (julong)ms.ullAvailVirtual; 708 return true; 709#else 710 // Limit to 1400m because of the 2gb address space wall 711 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual); 712 return true; 713#endif 714} 715 716// VC6 lacks DWORD_PTR 717#if _MSC_VER < 1300 718typedef UINT_PTR DWORD_PTR; 719#endif 720 721int os::active_processor_count() { 722 DWORD_PTR lpProcessAffinityMask = 0; 723 DWORD_PTR lpSystemAffinityMask = 0; 724 int proc_count = processor_count(); 725 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 726 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 727 // Nof active processors is number of bits in process affinity mask 728 int bitcount = 0; 729 while (lpProcessAffinityMask != 0) { 730 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 731 bitcount++; 732 } 733 return bitcount; 734 } else { 735 return proc_count; 736 } 737} 738 739void os::set_native_thread_name(const char *name) { 740 741 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx 742 // 743 // Note that unfortunately this only works if the process 744 // is already attached to a debugger; debugger must observe 745 // the exception below to show the correct name. 746 747 const DWORD MS_VC_EXCEPTION = 0x406D1388; 748 struct { 749 DWORD dwType; // must be 0x1000 750 LPCSTR szName; // pointer to name (in user addr space) 751 DWORD dwThreadID; // thread ID (-1=caller thread) 752 DWORD dwFlags; // reserved for future use, must be zero 753 } info; 754 755 info.dwType = 0x1000; 756 info.szName = name; 757 info.dwThreadID = -1; 758 info.dwFlags = 0; 759 760 __try { 761 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info ); 762 } __except(EXCEPTION_CONTINUE_EXECUTION) {} 763} 764 765bool os::distribute_processes(uint length, uint* distribution) { 766 // Not yet implemented. 767 return false; 768} 769 770bool os::bind_to_processor(uint processor_id) { 771 // Not yet implemented. 772 return false; 773} 774 775void os::win32::initialize_performance_counter() { 776 LARGE_INTEGER count; 777 if (QueryPerformanceFrequency(&count)) { 778 win32::_has_performance_count = 1; 779 performance_frequency = as_long(count); 780 QueryPerformanceCounter(&count); 781 initial_performance_count = as_long(count); 782 } else { 783 win32::_has_performance_count = 0; 784 FILETIME wt; 785 GetSystemTimeAsFileTime(&wt); 786 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 787 } 788} 789 790 791double os::elapsedTime() { 792 return (double) elapsed_counter() / (double) elapsed_frequency(); 793} 794 795 796// Windows format: 797// The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 798// Java format: 799// Java standards require the number of milliseconds since 1/1/1970 800 801// Constant offset - calculated using offset() 802static jlong _offset = 116444736000000000; 803// Fake time counter for reproducible results when debugging 804static jlong fake_time = 0; 805 806#ifdef ASSERT 807// Just to be safe, recalculate the offset in debug mode 808static jlong _calculated_offset = 0; 809static int _has_calculated_offset = 0; 810 811jlong offset() { 812 if (_has_calculated_offset) return _calculated_offset; 813 SYSTEMTIME java_origin; 814 java_origin.wYear = 1970; 815 java_origin.wMonth = 1; 816 java_origin.wDayOfWeek = 0; // ignored 817 java_origin.wDay = 1; 818 java_origin.wHour = 0; 819 java_origin.wMinute = 0; 820 java_origin.wSecond = 0; 821 java_origin.wMilliseconds = 0; 822 FILETIME jot; 823 if (!SystemTimeToFileTime(&java_origin, &jot)) { 824 fatal(err_msg("Error = %d\nWindows error", GetLastError())); 825 } 826 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 827 _has_calculated_offset = 1; 828 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 829 return _calculated_offset; 830} 831#else 832jlong offset() { 833 return _offset; 834} 835#endif 836 837jlong windows_to_java_time(FILETIME wt) { 838 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 839 return (a - offset()) / 10000; 840} 841 842FILETIME java_to_windows_time(jlong l) { 843 jlong a = (l * 10000) + offset(); 844 FILETIME result; 845 result.dwHighDateTime = high(a); 846 result.dwLowDateTime = low(a); 847 return result; 848} 849 850bool os::supports_vtime() { return true; } 851bool os::enable_vtime() { return false; } 852bool os::vtime_enabled() { return false; } 853 854double os::elapsedVTime() { 855 FILETIME created; 856 FILETIME exited; 857 FILETIME kernel; 858 FILETIME user; 859 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) { 860 // the resolution of windows_to_java_time() should be sufficient (ms) 861 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS; 862 } else { 863 return elapsedTime(); 864 } 865} 866 867jlong os::javaTimeMillis() { 868 if (UseFakeTimers) { 869 return fake_time++; 870 } else { 871 FILETIME wt; 872 GetSystemTimeAsFileTime(&wt); 873 return windows_to_java_time(wt); 874 } 875} 876 877jlong os::javaTimeNanos() { 878 if (!win32::_has_performance_count) { 879 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do. 880 } else { 881 LARGE_INTEGER current_count; 882 QueryPerformanceCounter(¤t_count); 883 double current = as_long(current_count); 884 double freq = performance_frequency; 885 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC); 886 return time; 887 } 888} 889 890void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 891 if (!win32::_has_performance_count) { 892 // javaTimeMillis() doesn't have much percision, 893 // but it is not going to wrap -- so all 64 bits 894 info_ptr->max_value = ALL_64_BITS; 895 896 // this is a wall clock timer, so may skip 897 info_ptr->may_skip_backward = true; 898 info_ptr->may_skip_forward = true; 899 } else { 900 jlong freq = performance_frequency; 901 if (freq < NANOSECS_PER_SEC) { 902 // the performance counter is 64 bits and we will 903 // be multiplying it -- so no wrap in 64 bits 904 info_ptr->max_value = ALL_64_BITS; 905 } else if (freq > NANOSECS_PER_SEC) { 906 // use the max value the counter can reach to 907 // determine the max value which could be returned 908 julong max_counter = (julong)ALL_64_BITS; 909 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC)); 910 } else { 911 // the performance counter is 64 bits and we will 912 // be using it directly -- so no wrap in 64 bits 913 info_ptr->max_value = ALL_64_BITS; 914 } 915 916 // using a counter, so no skipping 917 info_ptr->may_skip_backward = false; 918 info_ptr->may_skip_forward = false; 919 } 920 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 921} 922 923char* os::local_time_string(char *buf, size_t buflen) { 924 SYSTEMTIME st; 925 GetLocalTime(&st); 926 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 927 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 928 return buf; 929} 930 931bool os::getTimesSecs(double* process_real_time, 932 double* process_user_time, 933 double* process_system_time) { 934 HANDLE h_process = GetCurrentProcess(); 935 FILETIME create_time, exit_time, kernel_time, user_time; 936 BOOL result = GetProcessTimes(h_process, 937 &create_time, 938 &exit_time, 939 &kernel_time, 940 &user_time); 941 if (result != 0) { 942 FILETIME wt; 943 GetSystemTimeAsFileTime(&wt); 944 jlong rtc_millis = windows_to_java_time(wt); 945 jlong user_millis = windows_to_java_time(user_time); 946 jlong system_millis = windows_to_java_time(kernel_time); 947 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 948 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); 949 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); 950 return true; 951 } else { 952 return false; 953 } 954} 955 956void os::shutdown() { 957 // allow PerfMemory to attempt cleanup of any persistent resources 958 perfMemory_exit(); 959 960 // flush buffered output, finish log files 961 ostream_abort(); 962 963 // Check for abort hook 964 abort_hook_t abort_hook = Arguments::abort_hook(); 965 if (abort_hook != NULL) { 966 abort_hook(); 967 } 968} 969 970 971static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 972 PMINIDUMP_EXCEPTION_INFORMATION, 973 PMINIDUMP_USER_STREAM_INFORMATION, 974 PMINIDUMP_CALLBACK_INFORMATION); 975 976void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) { 977 HINSTANCE dbghelp; 978 EXCEPTION_POINTERS ep; 979 MINIDUMP_EXCEPTION_INFORMATION mei; 980 MINIDUMP_EXCEPTION_INFORMATION* pmei; 981 982 HANDLE hProcess = GetCurrentProcess(); 983 DWORD processId = GetCurrentProcessId(); 984 HANDLE dumpFile; 985 MINIDUMP_TYPE dumpType; 986 static const char* cwd; 987 988// Default is to always create dump for debug builds, on product builds only dump on server versions of Windows. 989#ifndef ASSERT 990 // If running on a client version of Windows and user has not explicitly enabled dumping 991 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) { 992 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false); 993 return; 994 // If running on a server version of Windows and user has explictly disabled dumping 995 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) { 996 VMError::report_coredump_status("Minidump has been disabled from the command line", false); 997 return; 998 } 999#else 1000 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) { 1001 VMError::report_coredump_status("Minidump has been disabled from the command line", false); 1002 return; 1003 } 1004#endif 1005 1006 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0); 1007 1008 if (dbghelp == NULL) { 1009 VMError::report_coredump_status("Failed to load dbghelp.dll", false); 1010 return; 1011 } 1012 1013 _MiniDumpWriteDump = 1014 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 1015 PMINIDUMP_EXCEPTION_INFORMATION, 1016 PMINIDUMP_USER_STREAM_INFORMATION, 1017 PMINIDUMP_CALLBACK_INFORMATION), 1018 GetProcAddress(dbghelp, 1019 "MiniDumpWriteDump")); 1020 1021 if (_MiniDumpWriteDump == NULL) { 1022 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false); 1023 return; 1024 } 1025 1026 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData); 1027 1028// Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with 1029// API_VERSION_NUMBER 11 or higher contains the ones we want though 1030#if API_VERSION_NUMBER >= 11 1031 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | 1032 MiniDumpWithUnloadedModules); 1033#endif 1034 1035 cwd = get_current_directory(NULL, 0); 1036 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp", cwd, current_process_id()); 1037 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); 1038 1039 if (dumpFile == INVALID_HANDLE_VALUE) { 1040 VMError::report_coredump_status("Failed to create file for dumping", false); 1041 return; 1042 } 1043 if (exceptionRecord != NULL && contextRecord != NULL) { 1044 ep.ContextRecord = (PCONTEXT) contextRecord; 1045 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord; 1046 1047 mei.ThreadId = GetCurrentThreadId(); 1048 mei.ExceptionPointers = &ep; 1049 pmei = &mei; 1050 } else { 1051 pmei = NULL; 1052 } 1053 1054 1055 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all 1056 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then. 1057 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false && 1058 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) { 1059 DWORD error = GetLastError(); 1060 LPTSTR msgbuf = NULL; 1061 1062 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | 1063 FORMAT_MESSAGE_FROM_SYSTEM | 1064 FORMAT_MESSAGE_IGNORE_INSERTS, 1065 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) { 1066 1067 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf); 1068 LocalFree(msgbuf); 1069 } else { 1070 // Call to FormatMessage failed, just include the result from GetLastError 1071 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error); 1072 } 1073 VMError::report_coredump_status(buffer, false); 1074 } else { 1075 VMError::report_coredump_status(buffer, true); 1076 } 1077 1078 CloseHandle(dumpFile); 1079} 1080 1081 1082void os::abort(bool dump_core) { 1083 os::shutdown(); 1084 // no core dump on Windows 1085 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1086} 1087 1088// Die immediately, no exit hook, no abort hook, no cleanup. 1089void os::die() { 1090 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1); 1091} 1092 1093// Directory routines copied from src/win32/native/java/io/dirent_md.c 1094// * dirent_md.c 1.15 00/02/02 1095// 1096// The declarations for DIR and struct dirent are in jvm_win32.h. 1097 1098// Caller must have already run dirname through JVM_NativePath, which removes 1099// duplicate slashes and converts all instances of '/' into '\\'. 1100 1101DIR * os::opendir(const char *dirname) { 1102 assert(dirname != NULL, "just checking"); // hotspot change 1103 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal); 1104 DWORD fattr; // hotspot change 1105 char alt_dirname[4] = { 0, 0, 0, 0 }; 1106 1107 if (dirp == 0) { 1108 errno = ENOMEM; 1109 return 0; 1110 } 1111 1112 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it 1113 // as a directory in FindFirstFile(). We detect this case here and 1114 // prepend the current drive name. 1115 // 1116 if (dirname[1] == '\0' && dirname[0] == '\\') { 1117 alt_dirname[0] = _getdrive() + 'A' - 1; 1118 alt_dirname[1] = ':'; 1119 alt_dirname[2] = '\\'; 1120 alt_dirname[3] = '\0'; 1121 dirname = alt_dirname; 1122 } 1123 1124 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal); 1125 if (dirp->path == 0) { 1126 free(dirp, mtInternal); 1127 errno = ENOMEM; 1128 return 0; 1129 } 1130 strcpy(dirp->path, dirname); 1131 1132 fattr = GetFileAttributes(dirp->path); 1133 if (fattr == 0xffffffff) { 1134 free(dirp->path, mtInternal); 1135 free(dirp, mtInternal); 1136 errno = ENOENT; 1137 return 0; 1138 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 1139 free(dirp->path, mtInternal); 1140 free(dirp, mtInternal); 1141 errno = ENOTDIR; 1142 return 0; 1143 } 1144 1145 // Append "*.*", or possibly "\\*.*", to path 1146 if (dirp->path[1] == ':' && 1147 (dirp->path[2] == '\0' || 1148 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 1149 // No '\\' needed for cases like "Z:" or "Z:\" 1150 strcat(dirp->path, "*.*"); 1151 } else { 1152 strcat(dirp->path, "\\*.*"); 1153 } 1154 1155 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 1156 if (dirp->handle == INVALID_HANDLE_VALUE) { 1157 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 1158 free(dirp->path, mtInternal); 1159 free(dirp, mtInternal); 1160 errno = EACCES; 1161 return 0; 1162 } 1163 } 1164 return dirp; 1165} 1166 1167// parameter dbuf unused on Windows 1168struct dirent * os::readdir(DIR *dirp, dirent *dbuf) { 1169 assert(dirp != NULL, "just checking"); // hotspot change 1170 if (dirp->handle == INVALID_HANDLE_VALUE) { 1171 return 0; 1172 } 1173 1174 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 1175 1176 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 1177 if (GetLastError() == ERROR_INVALID_HANDLE) { 1178 errno = EBADF; 1179 return 0; 1180 } 1181 FindClose(dirp->handle); 1182 dirp->handle = INVALID_HANDLE_VALUE; 1183 } 1184 1185 return &dirp->dirent; 1186} 1187 1188int os::closedir(DIR *dirp) { 1189 assert(dirp != NULL, "just checking"); // hotspot change 1190 if (dirp->handle != INVALID_HANDLE_VALUE) { 1191 if (!FindClose(dirp->handle)) { 1192 errno = EBADF; 1193 return -1; 1194 } 1195 dirp->handle = INVALID_HANDLE_VALUE; 1196 } 1197 free(dirp->path, mtInternal); 1198 free(dirp, mtInternal); 1199 return 0; 1200} 1201 1202// This must be hard coded because it's the system's temporary 1203// directory not the java application's temp directory, ala java.io.tmpdir. 1204const char* os::get_temp_directory() { 1205 static char path_buf[MAX_PATH]; 1206 if (GetTempPath(MAX_PATH, path_buf) > 0) { 1207 return path_buf; 1208 } else { 1209 path_buf[0] = '\0'; 1210 return path_buf; 1211 } 1212} 1213 1214static bool file_exists(const char* filename) { 1215 if (filename == NULL || strlen(filename) == 0) { 1216 return false; 1217 } 1218 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES; 1219} 1220 1221bool os::dll_build_name(char *buffer, size_t buflen, 1222 const char* pname, const char* fname) { 1223 bool retval = false; 1224 const size_t pnamelen = pname ? strlen(pname) : 0; 1225 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0; 1226 1227 // Return error on buffer overflow. 1228 if (pnamelen + strlen(fname) + 10 > buflen) { 1229 return retval; 1230 } 1231 1232 if (pnamelen == 0) { 1233 jio_snprintf(buffer, buflen, "%s.dll", fname); 1234 retval = true; 1235 } else if (c == ':' || c == '\\') { 1236 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname); 1237 retval = true; 1238 } else if (strchr(pname, *os::path_separator()) != NULL) { 1239 int n; 1240 char** pelements = split_path(pname, &n); 1241 if (pelements == NULL) { 1242 return false; 1243 } 1244 for (int i = 0; i < n; i++) { 1245 char* path = pelements[i]; 1246 // Really shouldn't be NULL, but check can't hurt 1247 size_t plen = (path == NULL) ? 0 : strlen(path); 1248 if (plen == 0) { 1249 continue; // skip the empty path values 1250 } 1251 const char lastchar = path[plen - 1]; 1252 if (lastchar == ':' || lastchar == '\\') { 1253 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname); 1254 } else { 1255 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname); 1256 } 1257 if (file_exists(buffer)) { 1258 retval = true; 1259 break; 1260 } 1261 } 1262 // release the storage 1263 for (int i = 0; i < n; i++) { 1264 if (pelements[i] != NULL) { 1265 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); 1266 } 1267 } 1268 if (pelements != NULL) { 1269 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); 1270 } 1271 } else { 1272 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname); 1273 retval = true; 1274 } 1275 return retval; 1276} 1277 1278// Needs to be in os specific directory because windows requires another 1279// header file <direct.h> 1280const char* os::get_current_directory(char *buf, size_t buflen) { 1281 int n = static_cast<int>(buflen); 1282 if (buflen > INT_MAX) n = INT_MAX; 1283 return _getcwd(buf, n); 1284} 1285 1286//----------------------------------------------------------- 1287// Helper functions for fatal error handler 1288#ifdef _WIN64 1289// Helper routine which returns true if address in 1290// within the NTDLL address space. 1291// 1292static bool _addr_in_ntdll(address addr) { 1293 HMODULE hmod; 1294 MODULEINFO minfo; 1295 1296 hmod = GetModuleHandle("NTDLL.DLL"); 1297 if (hmod == NULL) return false; 1298 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod, 1299 &minfo, sizeof(MODULEINFO))) { 1300 return false; 1301 } 1302 1303 if ((addr >= minfo.lpBaseOfDll) && 1304 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) { 1305 return true; 1306 } else { 1307 return false; 1308 } 1309} 1310#endif 1311 1312struct _modinfo { 1313 address addr; 1314 char* full_path; // point to a char buffer 1315 int buflen; // size of the buffer 1316 address base_addr; 1317}; 1318 1319static int _locate_module_by_addr(const char * mod_fname, address base_addr, 1320 address top_address, void * param) { 1321 struct _modinfo *pmod = (struct _modinfo *)param; 1322 if (!pmod) return -1; 1323 1324 if (base_addr <= pmod->addr && 1325 top_address > pmod->addr) { 1326 // if a buffer is provided, copy path name to the buffer 1327 if (pmod->full_path) { 1328 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1329 } 1330 pmod->base_addr = base_addr; 1331 return 1; 1332 } 1333 return 0; 1334} 1335 1336bool os::dll_address_to_library_name(address addr, char* buf, 1337 int buflen, int* offset) { 1338 // buf is not optional, but offset is optional 1339 assert(buf != NULL, "sanity check"); 1340 1341// NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1342// return the full path to the DLL file, sometimes it returns path 1343// to the corresponding PDB file (debug info); sometimes it only 1344// returns partial path, which makes life painful. 1345 1346 struct _modinfo mi; 1347 mi.addr = addr; 1348 mi.full_path = buf; 1349 mi.buflen = buflen; 1350 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) { 1351 // buf already contains path name 1352 if (offset) *offset = addr - mi.base_addr; 1353 return true; 1354 } 1355 1356 buf[0] = '\0'; 1357 if (offset) *offset = -1; 1358 return false; 1359} 1360 1361bool os::dll_address_to_function_name(address addr, char *buf, 1362 int buflen, int *offset) { 1363 // buf is not optional, but offset is optional 1364 assert(buf != NULL, "sanity check"); 1365 1366 if (Decoder::decode(addr, buf, buflen, offset)) { 1367 return true; 1368 } 1369 if (offset != NULL) *offset = -1; 1370 buf[0] = '\0'; 1371 return false; 1372} 1373 1374// save the start and end address of jvm.dll into param[0] and param[1] 1375static int _locate_jvm_dll(const char* mod_fname, address base_addr, 1376 address top_address, void * param) { 1377 if (!param) return -1; 1378 1379 if (base_addr <= (address)_locate_jvm_dll && 1380 top_address > (address)_locate_jvm_dll) { 1381 ((address*)param)[0] = base_addr; 1382 ((address*)param)[1] = top_address; 1383 return 1; 1384 } 1385 return 0; 1386} 1387 1388address vm_lib_location[2]; // start and end address of jvm.dll 1389 1390// check if addr is inside jvm.dll 1391bool os::address_is_in_vm(address addr) { 1392 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1393 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) { 1394 assert(false, "Can't find jvm module."); 1395 return false; 1396 } 1397 } 1398 1399 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1400} 1401 1402// print module info; param is outputStream* 1403static int _print_module(const char* fname, address base_address, 1404 address top_address, void* param) { 1405 if (!param) return -1; 1406 1407 outputStream* st = (outputStream*)param; 1408 1409 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname); 1410 return 0; 1411} 1412 1413// Loads .dll/.so and 1414// in case of error it checks if .dll/.so was built for the 1415// same architecture as Hotspot is running on 1416void * os::dll_load(const char *name, char *ebuf, int ebuflen) { 1417 void * result = LoadLibrary(name); 1418 if (result != NULL) { 1419 return result; 1420 } 1421 1422 DWORD errcode = GetLastError(); 1423 if (errcode == ERROR_MOD_NOT_FOUND) { 1424 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1); 1425 ebuf[ebuflen - 1] = '\0'; 1426 return NULL; 1427 } 1428 1429 // Parsing dll below 1430 // If we can read dll-info and find that dll was built 1431 // for an architecture other than Hotspot is running in 1432 // - then print to buffer "DLL was built for a different architecture" 1433 // else call os::lasterror to obtain system error message 1434 1435 // Read system error message into ebuf 1436 // It may or may not be overwritten below (in the for loop and just above) 1437 lasterror(ebuf, (size_t) ebuflen); 1438 ebuf[ebuflen - 1] = '\0'; 1439 int fd = ::open(name, O_RDONLY | O_BINARY, 0); 1440 if (fd < 0) { 1441 return NULL; 1442 } 1443 1444 uint32_t signature_offset; 1445 uint16_t lib_arch = 0; 1446 bool failed_to_get_lib_arch = 1447 ( // Go to position 3c in the dll 1448 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0) 1449 || 1450 // Read location of signature 1451 (sizeof(signature_offset) != 1452 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset)))) 1453 || 1454 // Go to COFF File Header in dll 1455 // that is located after "signature" (4 bytes long) 1456 (os::seek_to_file_offset(fd, 1457 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0) 1458 || 1459 // Read field that contains code of architecture 1460 // that dll was built for 1461 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch)))) 1462 ); 1463 1464 ::close(fd); 1465 if (failed_to_get_lib_arch) { 1466 // file i/o error - report os::lasterror(...) msg 1467 return NULL; 1468 } 1469 1470 typedef struct { 1471 uint16_t arch_code; 1472 char* arch_name; 1473 } arch_t; 1474 1475 static const arch_t arch_array[] = { 1476 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1477 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1478 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1479 }; 1480#if (defined _M_IA64) 1481 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64; 1482#elif (defined _M_AMD64) 1483 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64; 1484#elif (defined _M_IX86) 1485 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386; 1486#else 1487 #error Method os::dll_load requires that one of following \ 1488 is defined :_M_IA64,_M_AMD64 or _M_IX86 1489#endif 1490 1491 1492 // Obtain a string for printf operation 1493 // lib_arch_str shall contain string what platform this .dll was built for 1494 // running_arch_str shall string contain what platform Hotspot was built for 1495 char *running_arch_str = NULL, *lib_arch_str = NULL; 1496 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) { 1497 if (lib_arch == arch_array[i].arch_code) { 1498 lib_arch_str = arch_array[i].arch_name; 1499 } 1500 if (running_arch == arch_array[i].arch_code) { 1501 running_arch_str = arch_array[i].arch_name; 1502 } 1503 } 1504 1505 assert(running_arch_str, 1506 "Didn't find running architecture code in arch_array"); 1507 1508 // If the architecture is right 1509 // but some other error took place - report os::lasterror(...) msg 1510 if (lib_arch == running_arch) { 1511 return NULL; 1512 } 1513 1514 if (lib_arch_str != NULL) { 1515 ::_snprintf(ebuf, ebuflen - 1, 1516 "Can't load %s-bit .dll on a %s-bit platform", 1517 lib_arch_str, running_arch_str); 1518 } else { 1519 // don't know what architecture this dll was build for 1520 ::_snprintf(ebuf, ebuflen - 1, 1521 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1522 lib_arch, running_arch_str); 1523 } 1524 1525 return NULL; 1526} 1527 1528void os::print_dll_info(outputStream *st) { 1529 st->print_cr("Dynamic libraries:"); 1530 get_loaded_modules_info(_print_module, (void *)st); 1531} 1532 1533int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1534 HANDLE hProcess; 1535 1536# define MAX_NUM_MODULES 128 1537 HMODULE modules[MAX_NUM_MODULES]; 1538 static char filename[MAX_PATH]; 1539 int result = 0; 1540 1541 if (!os::PSApiDll::PSApiAvailable()) { 1542 return 0; 1543 } 1544 1545 int pid = os::current_process_id(); 1546 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1547 FALSE, pid); 1548 if (hProcess == NULL) return 0; 1549 1550 DWORD size_needed; 1551 if (!os::PSApiDll::EnumProcessModules(hProcess, modules, 1552 sizeof(modules), &size_needed)) { 1553 CloseHandle(hProcess); 1554 return 0; 1555 } 1556 1557 // number of modules that are currently loaded 1558 int num_modules = size_needed / sizeof(HMODULE); 1559 1560 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1561 // Get Full pathname: 1562 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i], 1563 filename, sizeof(filename))) { 1564 filename[0] = '\0'; 1565 } 1566 1567 MODULEINFO modinfo; 1568 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i], 1569 &modinfo, sizeof(modinfo))) { 1570 modinfo.lpBaseOfDll = NULL; 1571 modinfo.SizeOfImage = 0; 1572 } 1573 1574 // Invoke callback function 1575 result = callback(filename, (address)modinfo.lpBaseOfDll, 1576 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param); 1577 if (result) break; 1578 } 1579 1580 CloseHandle(hProcess); 1581 return result; 1582} 1583 1584void os::print_os_info_brief(outputStream* st) { 1585 os::print_os_info(st); 1586} 1587 1588void os::print_os_info(outputStream* st) { 1589#ifdef ASSERT 1590 char buffer[1024]; 1591 DWORD size = sizeof(buffer); 1592 st->print(" HostName: "); 1593 if (GetComputerNameEx(ComputerNameDnsHostname, buffer, &size)) { 1594 st->print("%s", buffer); 1595 } else { 1596 st->print("N/A"); 1597 } 1598#endif 1599 st->print(" OS:"); 1600 os::win32::print_windows_version(st); 1601} 1602 1603void os::win32::print_windows_version(outputStream* st) { 1604 OSVERSIONINFOEX osvi; 1605 VS_FIXEDFILEINFO *file_info; 1606 TCHAR kernel32_path[MAX_PATH]; 1607 UINT len, ret; 1608 1609 // Use the GetVersionEx information to see if we're on a server or 1610 // workstation edition of Windows. Starting with Windows 8.1 we can't 1611 // trust the OS version information returned by this API. 1612 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1613 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1614 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1615 st->print_cr("Call to GetVersionEx failed"); 1616 return; 1617 } 1618 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION); 1619 1620 // Get the full path to \Windows\System32\kernel32.dll and use that for 1621 // determining what version of Windows we're running on. 1622 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1; 1623 ret = GetSystemDirectory(kernel32_path, len); 1624 if (ret == 0 || ret > len) { 1625 st->print_cr("Call to GetSystemDirectory failed"); 1626 return; 1627 } 1628 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret); 1629 1630 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL); 1631 if (version_size == 0) { 1632 st->print_cr("Call to GetFileVersionInfoSize failed"); 1633 return; 1634 } 1635 1636 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal); 1637 if (version_info == NULL) { 1638 st->print_cr("Failed to allocate version_info"); 1639 return; 1640 } 1641 1642 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) { 1643 os::free(version_info); 1644 st->print_cr("Call to GetFileVersionInfo failed"); 1645 return; 1646 } 1647 1648 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) { 1649 os::free(version_info); 1650 st->print_cr("Call to VerQueryValue failed"); 1651 return; 1652 } 1653 1654 int major_version = HIWORD(file_info->dwProductVersionMS); 1655 int minor_version = LOWORD(file_info->dwProductVersionMS); 1656 int build_number = HIWORD(file_info->dwProductVersionLS); 1657 int build_minor = LOWORD(file_info->dwProductVersionLS); 1658 int os_vers = major_version * 1000 + minor_version; 1659 os::free(version_info); 1660 1661 st->print(" Windows "); 1662 switch (os_vers) { 1663 1664 case 6000: 1665 if (is_workstation) { 1666 st->print("Vista"); 1667 } else { 1668 st->print("Server 2008"); 1669 } 1670 break; 1671 1672 case 6001: 1673 if (is_workstation) { 1674 st->print("7"); 1675 } else { 1676 st->print("Server 2008 R2"); 1677 } 1678 break; 1679 1680 case 6002: 1681 if (is_workstation) { 1682 st->print("8"); 1683 } else { 1684 st->print("Server 2012"); 1685 } 1686 break; 1687 1688 case 6003: 1689 if (is_workstation) { 1690 st->print("8.1"); 1691 } else { 1692 st->print("Server 2012 R2"); 1693 } 1694 break; 1695 1696 case 6004: 1697 if (is_workstation) { 1698 st->print("10"); 1699 } else { 1700 // The server version name of Windows 10 is not known at this time 1701 st->print("%d.%d", major_version, minor_version); 1702 } 1703 break; 1704 1705 default: 1706 // Unrecognized windows, print out its major and minor versions 1707 st->print("%d.%d", major_version, minor_version); 1708 break; 1709 } 1710 1711 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1712 // find out whether we are running on 64 bit processor or not 1713 SYSTEM_INFO si; 1714 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1715 os::Kernel32Dll::GetNativeSystemInfo(&si); 1716 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1717 st->print(" , 64 bit"); 1718 } 1719 1720 st->print(" Build %d", build_number); 1721 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor); 1722 st->cr(); 1723} 1724 1725void os::pd_print_cpu_info(outputStream* st) { 1726 // Nothing to do for now. 1727} 1728 1729void os::print_memory_info(outputStream* st) { 1730 st->print("Memory:"); 1731 st->print(" %dk page", os::vm_page_size()>>10); 1732 1733 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1734 // value if total memory is larger than 4GB 1735 MEMORYSTATUSEX ms; 1736 ms.dwLength = sizeof(ms); 1737 GlobalMemoryStatusEx(&ms); 1738 1739 st->print(", physical %uk", os::physical_memory() >> 10); 1740 st->print("(%uk free)", os::available_memory() >> 10); 1741 1742 st->print(", swap %uk", ms.ullTotalPageFile >> 10); 1743 st->print("(%uk free)", ms.ullAvailPageFile >> 10); 1744 st->cr(); 1745} 1746 1747void os::print_siginfo(outputStream *st, void *siginfo) { 1748 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1749 st->print("siginfo:"); 1750 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1751 1752 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1753 er->NumberParameters >= 2) { 1754 switch (er->ExceptionInformation[0]) { 1755 case 0: st->print(", reading address"); break; 1756 case 1: st->print(", writing address"); break; 1757 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1758 er->ExceptionInformation[0]); 1759 } 1760 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1761 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1762 er->NumberParameters >= 2 && UseSharedSpaces) { 1763 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1764 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1765 st->print("\n\nError accessing class data sharing archive." \ 1766 " Mapped file inaccessible during execution, " \ 1767 " possible disk/network problem."); 1768 } 1769 } else { 1770 int num = er->NumberParameters; 1771 if (num > 0) { 1772 st->print(", ExceptionInformation="); 1773 for (int i = 0; i < num; i++) { 1774 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1775 } 1776 } 1777 } 1778 st->cr(); 1779} 1780 1781void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1782 // do nothing 1783} 1784 1785static char saved_jvm_path[MAX_PATH] = {0}; 1786 1787// Find the full path to the current module, jvm.dll 1788void os::jvm_path(char *buf, jint buflen) { 1789 // Error checking. 1790 if (buflen < MAX_PATH) { 1791 assert(false, "must use a large-enough buffer"); 1792 buf[0] = '\0'; 1793 return; 1794 } 1795 // Lazy resolve the path to current module. 1796 if (saved_jvm_path[0] != 0) { 1797 strcpy(buf, saved_jvm_path); 1798 return; 1799 } 1800 1801 buf[0] = '\0'; 1802 if (Arguments::sun_java_launcher_is_altjvm()) { 1803 // Support for the java launcher's '-XXaltjvm=<path>' option. Check 1804 // for a JAVA_HOME environment variable and fix up the path so it 1805 // looks like jvm.dll is installed there (append a fake suffix 1806 // hotspot/jvm.dll). 1807 char* java_home_var = ::getenv("JAVA_HOME"); 1808 if (java_home_var != NULL && java_home_var[0] != 0 && 1809 strlen(java_home_var) < (size_t)buflen) { 1810 strncpy(buf, java_home_var, buflen); 1811 1812 // determine if this is a legacy image or modules image 1813 // modules image doesn't have "jre" subdirectory 1814 size_t len = strlen(buf); 1815 char* jrebin_p = buf + len; 1816 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1817 if (0 != _access(buf, 0)) { 1818 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1819 } 1820 len = strlen(buf); 1821 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1822 } 1823 } 1824 1825 if (buf[0] == '\0') { 1826 GetModuleFileName(vm_lib_handle, buf, buflen); 1827 } 1828 strncpy(saved_jvm_path, buf, MAX_PATH); 1829 saved_jvm_path[MAX_PATH - 1] = '\0'; 1830} 1831 1832 1833void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1834#ifndef _WIN64 1835 st->print("_"); 1836#endif 1837} 1838 1839 1840void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1841#ifndef _WIN64 1842 st->print("@%d", args_size * sizeof(int)); 1843#endif 1844} 1845 1846// This method is a copy of JDK's sysGetLastErrorString 1847// from src/windows/hpi/src/system_md.c 1848 1849size_t os::lasterror(char* buf, size_t len) { 1850 DWORD errval; 1851 1852 if ((errval = GetLastError()) != 0) { 1853 // DOS error 1854 size_t n = (size_t)FormatMessage( 1855 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1856 NULL, 1857 errval, 1858 0, 1859 buf, 1860 (DWORD)len, 1861 NULL); 1862 if (n > 3) { 1863 // Drop final '.', CR, LF 1864 if (buf[n - 1] == '\n') n--; 1865 if (buf[n - 1] == '\r') n--; 1866 if (buf[n - 1] == '.') n--; 1867 buf[n] = '\0'; 1868 } 1869 return n; 1870 } 1871 1872 if (errno != 0) { 1873 // C runtime error that has no corresponding DOS error code 1874 const char* s = strerror(errno); 1875 size_t n = strlen(s); 1876 if (n >= len) n = len - 1; 1877 strncpy(buf, s, n); 1878 buf[n] = '\0'; 1879 return n; 1880 } 1881 1882 return 0; 1883} 1884 1885int os::get_last_error() { 1886 DWORD error = GetLastError(); 1887 if (error == 0) { 1888 error = errno; 1889 } 1890 return (int)error; 1891} 1892 1893// sun.misc.Signal 1894// NOTE that this is a workaround for an apparent kernel bug where if 1895// a signal handler for SIGBREAK is installed then that signal handler 1896// takes priority over the console control handler for CTRL_CLOSE_EVENT. 1897// See bug 4416763. 1898static void (*sigbreakHandler)(int) = NULL; 1899 1900static void UserHandler(int sig, void *siginfo, void *context) { 1901 os::signal_notify(sig); 1902 // We need to reinstate the signal handler each time... 1903 os::signal(sig, (void*)UserHandler); 1904} 1905 1906void* os::user_handler() { 1907 return (void*) UserHandler; 1908} 1909 1910void* os::signal(int signal_number, void* handler) { 1911 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1912 void (*oldHandler)(int) = sigbreakHandler; 1913 sigbreakHandler = (void (*)(int)) handler; 1914 return (void*) oldHandler; 1915 } else { 1916 return (void*)::signal(signal_number, (void (*)(int))handler); 1917 } 1918} 1919 1920void os::signal_raise(int signal_number) { 1921 raise(signal_number); 1922} 1923 1924// The Win32 C runtime library maps all console control events other than ^C 1925// into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1926// logoff, and shutdown events. We therefore install our own console handler 1927// that raises SIGTERM for the latter cases. 1928// 1929static BOOL WINAPI consoleHandler(DWORD event) { 1930 switch (event) { 1931 case CTRL_C_EVENT: 1932 if (is_error_reported()) { 1933 // Ctrl-C is pressed during error reporting, likely because the error 1934 // handler fails to abort. Let VM die immediately. 1935 os::die(); 1936 } 1937 1938 os::signal_raise(SIGINT); 1939 return TRUE; 1940 break; 1941 case CTRL_BREAK_EVENT: 1942 if (sigbreakHandler != NULL) { 1943 (*sigbreakHandler)(SIGBREAK); 1944 } 1945 return TRUE; 1946 break; 1947 case CTRL_LOGOFF_EVENT: { 1948 // Don't terminate JVM if it is running in a non-interactive session, 1949 // such as a service process. 1950 USEROBJECTFLAGS flags; 1951 HANDLE handle = GetProcessWindowStation(); 1952 if (handle != NULL && 1953 GetUserObjectInformation(handle, UOI_FLAGS, &flags, 1954 sizeof(USEROBJECTFLAGS), NULL)) { 1955 // If it is a non-interactive session, let next handler to deal 1956 // with it. 1957 if ((flags.dwFlags & WSF_VISIBLE) == 0) { 1958 return FALSE; 1959 } 1960 } 1961 } 1962 case CTRL_CLOSE_EVENT: 1963 case CTRL_SHUTDOWN_EVENT: 1964 os::signal_raise(SIGTERM); 1965 return TRUE; 1966 break; 1967 default: 1968 break; 1969 } 1970 return FALSE; 1971} 1972 1973// The following code is moved from os.cpp for making this 1974// code platform specific, which it is by its very nature. 1975 1976// Return maximum OS signal used + 1 for internal use only 1977// Used as exit signal for signal_thread 1978int os::sigexitnum_pd() { 1979 return NSIG; 1980} 1981 1982// a counter for each possible signal value, including signal_thread exit signal 1983static volatile jint pending_signals[NSIG+1] = { 0 }; 1984static HANDLE sig_sem = NULL; 1985 1986void os::signal_init_pd() { 1987 // Initialize signal structures 1988 memset((void*)pending_signals, 0, sizeof(pending_signals)); 1989 1990 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 1991 1992 // Programs embedding the VM do not want it to attempt to receive 1993 // events like CTRL_LOGOFF_EVENT, which are used to implement the 1994 // shutdown hooks mechanism introduced in 1.3. For example, when 1995 // the VM is run as part of a Windows NT service (i.e., a servlet 1996 // engine in a web server), the correct behavior is for any console 1997 // control handler to return FALSE, not TRUE, because the OS's 1998 // "final" handler for such events allows the process to continue if 1999 // it is a service (while terminating it if it is not a service). 2000 // To make this behavior uniform and the mechanism simpler, we 2001 // completely disable the VM's usage of these console events if -Xrs 2002 // (=ReduceSignalUsage) is specified. This means, for example, that 2003 // the CTRL-BREAK thread dump mechanism is also disabled in this 2004 // case. See bugs 4323062, 4345157, and related bugs. 2005 2006 if (!ReduceSignalUsage) { 2007 // Add a CTRL-C handler 2008 SetConsoleCtrlHandler(consoleHandler, TRUE); 2009 } 2010} 2011 2012void os::signal_notify(int signal_number) { 2013 BOOL ret; 2014 if (sig_sem != NULL) { 2015 Atomic::inc(&pending_signals[signal_number]); 2016 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2017 assert(ret != 0, "ReleaseSemaphore() failed"); 2018 } 2019} 2020 2021static int check_pending_signals(bool wait_for_signal) { 2022 DWORD ret; 2023 while (true) { 2024 for (int i = 0; i < NSIG + 1; i++) { 2025 jint n = pending_signals[i]; 2026 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2027 return i; 2028 } 2029 } 2030 if (!wait_for_signal) { 2031 return -1; 2032 } 2033 2034 JavaThread *thread = JavaThread::current(); 2035 2036 ThreadBlockInVM tbivm(thread); 2037 2038 bool threadIsSuspended; 2039 do { 2040 thread->set_suspend_equivalent(); 2041 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2042 ret = ::WaitForSingleObject(sig_sem, INFINITE); 2043 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 2044 2045 // were we externally suspended while we were waiting? 2046 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2047 if (threadIsSuspended) { 2048 // The semaphore has been incremented, but while we were waiting 2049 // another thread suspended us. We don't want to continue running 2050 // while suspended because that would surprise the thread that 2051 // suspended us. 2052 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2053 assert(ret != 0, "ReleaseSemaphore() failed"); 2054 2055 thread->java_suspend_self(); 2056 } 2057 } while (threadIsSuspended); 2058 } 2059} 2060 2061int os::signal_lookup() { 2062 return check_pending_signals(false); 2063} 2064 2065int os::signal_wait() { 2066 return check_pending_signals(true); 2067} 2068 2069// Implicit OS exception handling 2070 2071LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, 2072 address handler) { 2073 JavaThread* thread = JavaThread::current(); 2074 // Save pc in thread 2075#ifdef _M_IA64 2076 // Do not blow up if no thread info available. 2077 if (thread) { 2078 // Saving PRECISE pc (with slot information) in thread. 2079 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress; 2080 // Convert precise PC into "Unix" format 2081 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2); 2082 thread->set_saved_exception_pc((address)precise_pc); 2083 } 2084 // Set pc to handler 2085 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 2086 // Clear out psr.ri (= Restart Instruction) in order to continue 2087 // at the beginning of the target bundle. 2088 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF; 2089 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!"); 2090#elif _M_AMD64 2091 // Do not blow up if no thread info available. 2092 if (thread) { 2093 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip); 2094 } 2095 // Set pc to handler 2096 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 2097#else 2098 // Do not blow up if no thread info available. 2099 if (thread) { 2100 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip); 2101 } 2102 // Set pc to handler 2103 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler; 2104#endif 2105 2106 // Continue the execution 2107 return EXCEPTION_CONTINUE_EXECUTION; 2108} 2109 2110 2111// Used for PostMortemDump 2112extern "C" void safepoints(); 2113extern "C" void find(int x); 2114extern "C" void events(); 2115 2116// According to Windows API documentation, an illegal instruction sequence should generate 2117// the 0xC000001C exception code. However, real world experience shows that occasionnaly 2118// the execution of an illegal instruction can generate the exception code 0xC000001E. This 2119// seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 2120 2121#define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 2122 2123// From "Execution Protection in the Windows Operating System" draft 0.35 2124// Once a system header becomes available, the "real" define should be 2125// included or copied here. 2126#define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2127 2128// Handle NAT Bit consumption on IA64. 2129#ifdef _M_IA64 2130 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION 2131#endif 2132 2133// Windows Vista/2008 heap corruption check 2134#define EXCEPTION_HEAP_CORRUPTION 0xC0000374 2135 2136#define def_excpt(val) #val, val 2137 2138struct siglabel { 2139 char *name; 2140 int number; 2141}; 2142 2143// All Visual C++ exceptions thrown from code generated by the Microsoft Visual 2144// C++ compiler contain this error code. Because this is a compiler-generated 2145// error, the code is not listed in the Win32 API header files. 2146// The code is actually a cryptic mnemonic device, with the initial "E" 2147// standing for "exception" and the final 3 bytes (0x6D7363) representing the 2148// ASCII values of "msc". 2149 2150#define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363 2151 2152 2153struct siglabel exceptlabels[] = { 2154 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2155 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2156 def_excpt(EXCEPTION_BREAKPOINT), 2157 def_excpt(EXCEPTION_SINGLE_STEP), 2158 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2159 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2160 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2161 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2162 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2163 def_excpt(EXCEPTION_FLT_OVERFLOW), 2164 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2165 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2166 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2167 def_excpt(EXCEPTION_INT_OVERFLOW), 2168 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2169 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2170 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2171 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2172 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2173 def_excpt(EXCEPTION_STACK_OVERFLOW), 2174 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2175 def_excpt(EXCEPTION_GUARD_PAGE), 2176 def_excpt(EXCEPTION_INVALID_HANDLE), 2177 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION), 2178 def_excpt(EXCEPTION_HEAP_CORRUPTION), 2179#ifdef _M_IA64 2180 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION), 2181#endif 2182 NULL, 0 2183}; 2184 2185const char* os::exception_name(int exception_code, char *buf, size_t size) { 2186 for (int i = 0; exceptlabels[i].name != NULL; i++) { 2187 if (exceptlabels[i].number == exception_code) { 2188 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2189 return buf; 2190 } 2191 } 2192 2193 return NULL; 2194} 2195 2196//----------------------------------------------------------------------------- 2197LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2198 // handle exception caused by idiv; should only happen for -MinInt/-1 2199 // (division by zero is handled explicitly) 2200#ifdef _M_IA64 2201 assert(0, "Fix Handle_IDiv_Exception"); 2202#elif _M_AMD64 2203 PCONTEXT ctx = exceptionInfo->ContextRecord; 2204 address pc = (address)ctx->Rip; 2205 assert(pc[0] == 0xF7, "not an idiv opcode"); 2206 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2207 assert(ctx->Rax == min_jint, "unexpected idiv exception"); 2208 // set correct result values and continue after idiv instruction 2209 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2210 ctx->Rax = (DWORD)min_jint; // result 2211 ctx->Rdx = (DWORD)0; // remainder 2212 // Continue the execution 2213#else 2214 PCONTEXT ctx = exceptionInfo->ContextRecord; 2215 address pc = (address)ctx->Eip; 2216 assert(pc[0] == 0xF7, "not an idiv opcode"); 2217 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2218 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2219 // set correct result values and continue after idiv instruction 2220 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2221 ctx->Eax = (DWORD)min_jint; // result 2222 ctx->Edx = (DWORD)0; // remainder 2223 // Continue the execution 2224#endif 2225 return EXCEPTION_CONTINUE_EXECUTION; 2226} 2227 2228//----------------------------------------------------------------------------- 2229LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2230 PCONTEXT ctx = exceptionInfo->ContextRecord; 2231#ifndef _WIN64 2232 // handle exception caused by native method modifying control word 2233 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2234 2235 switch (exception_code) { 2236 case EXCEPTION_FLT_DENORMAL_OPERAND: 2237 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2238 case EXCEPTION_FLT_INEXACT_RESULT: 2239 case EXCEPTION_FLT_INVALID_OPERATION: 2240 case EXCEPTION_FLT_OVERFLOW: 2241 case EXCEPTION_FLT_STACK_CHECK: 2242 case EXCEPTION_FLT_UNDERFLOW: 2243 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2244 if (fp_control_word != ctx->FloatSave.ControlWord) { 2245 // Restore FPCW and mask out FLT exceptions 2246 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2247 // Mask out pending FLT exceptions 2248 ctx->FloatSave.StatusWord &= 0xffffff00; 2249 return EXCEPTION_CONTINUE_EXECUTION; 2250 } 2251 } 2252 2253 if (prev_uef_handler != NULL) { 2254 // We didn't handle this exception so pass it to the previous 2255 // UnhandledExceptionFilter. 2256 return (prev_uef_handler)(exceptionInfo); 2257 } 2258#else // !_WIN64 2259 // On Windows, the mxcsr control bits are non-volatile across calls 2260 // See also CR 6192333 2261 // 2262 jint MxCsr = INITIAL_MXCSR; 2263 // we can't use StubRoutines::addr_mxcsr_std() 2264 // because in Win64 mxcsr is not saved there 2265 if (MxCsr != ctx->MxCsr) { 2266 ctx->MxCsr = MxCsr; 2267 return EXCEPTION_CONTINUE_EXECUTION; 2268 } 2269#endif // !_WIN64 2270 2271 return EXCEPTION_CONTINUE_SEARCH; 2272} 2273 2274static inline void report_error(Thread* t, DWORD exception_code, 2275 address addr, void* siginfo, void* context) { 2276 VMError err(t, exception_code, addr, siginfo, context); 2277 err.report_and_die(); 2278 2279 // If UseOsErrorReporting, this will return here and save the error file 2280 // somewhere where we can find it in the minidump. 2281} 2282 2283//----------------------------------------------------------------------------- 2284LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2285 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2286 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2287#ifdef _M_IA64 2288 // On Itanium, we need the "precise pc", which has the slot number coded 2289 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format). 2290 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress; 2291 // Convert the pc to "Unix format", which has the slot number coded 2292 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2 2293 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction" 2294 // information is saved in the Unix format. 2295 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2)); 2296#elif _M_AMD64 2297 address pc = (address) exceptionInfo->ContextRecord->Rip; 2298#else 2299 address pc = (address) exceptionInfo->ContextRecord->Eip; 2300#endif 2301 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 2302 2303 // Handle SafeFetch32 and SafeFetchN exceptions. 2304 if (StubRoutines::is_safefetch_fault(pc)) { 2305 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc)); 2306 } 2307 2308#ifndef _WIN64 2309 // Execution protection violation - win32 running on AMD64 only 2310 // Handled first to avoid misdiagnosis as a "normal" access violation; 2311 // This is safe to do because we have a new/unique ExceptionInformation 2312 // code for this condition. 2313 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2314 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2315 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2316 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2317 2318 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2319 int page_size = os::vm_page_size(); 2320 2321 // Make sure the pc and the faulting address are sane. 2322 // 2323 // If an instruction spans a page boundary, and the page containing 2324 // the beginning of the instruction is executable but the following 2325 // page is not, the pc and the faulting address might be slightly 2326 // different - we still want to unguard the 2nd page in this case. 2327 // 2328 // 15 bytes seems to be a (very) safe value for max instruction size. 2329 bool pc_is_near_addr = 2330 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2331 bool instr_spans_page_boundary = 2332 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2333 (intptr_t) page_size) > 0); 2334 2335 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2336 static volatile address last_addr = 2337 (address) os::non_memory_address_word(); 2338 2339 // In conservative mode, don't unguard unless the address is in the VM 2340 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2341 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2342 2343 // Set memory to RWX and retry 2344 address page_start = 2345 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2346 bool res = os::protect_memory((char*) page_start, page_size, 2347 os::MEM_PROT_RWX); 2348 2349 if (PrintMiscellaneous && Verbose) { 2350 char buf[256]; 2351 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 2352 "at " INTPTR_FORMAT 2353 ", unguarding " INTPTR_FORMAT ": %s", addr, 2354 page_start, (res ? "success" : strerror(errno))); 2355 tty->print_raw_cr(buf); 2356 } 2357 2358 // Set last_addr so if we fault again at the same address, we don't 2359 // end up in an endless loop. 2360 // 2361 // There are two potential complications here. Two threads trapping 2362 // at the same address at the same time could cause one of the 2363 // threads to think it already unguarded, and abort the VM. Likely 2364 // very rare. 2365 // 2366 // The other race involves two threads alternately trapping at 2367 // different addresses and failing to unguard the page, resulting in 2368 // an endless loop. This condition is probably even more unlikely 2369 // than the first. 2370 // 2371 // Although both cases could be avoided by using locks or thread 2372 // local last_addr, these solutions are unnecessary complication: 2373 // this handler is a best-effort safety net, not a complete solution. 2374 // It is disabled by default and should only be used as a workaround 2375 // in case we missed any no-execute-unsafe VM code. 2376 2377 last_addr = addr; 2378 2379 return EXCEPTION_CONTINUE_EXECUTION; 2380 } 2381 } 2382 2383 // Last unguard failed or not unguarding 2384 tty->print_raw_cr("Execution protection violation"); 2385 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2386 exceptionInfo->ContextRecord); 2387 return EXCEPTION_CONTINUE_SEARCH; 2388 } 2389 } 2390#endif // _WIN64 2391 2392 // Check to see if we caught the safepoint code in the 2393 // process of write protecting the memory serialization page. 2394 // It write enables the page immediately after protecting it 2395 // so just return. 2396 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2397 JavaThread* thread = (JavaThread*) t; 2398 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2399 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2400 if (os::is_memory_serialize_page(thread, addr)) { 2401 // Block current thread until the memory serialize page permission restored. 2402 os::block_on_serialize_page_trap(); 2403 return EXCEPTION_CONTINUE_EXECUTION; 2404 } 2405 } 2406 2407 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) && 2408 VM_Version::is_cpuinfo_segv_addr(pc)) { 2409 // Verify that OS save/restore AVX registers. 2410 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr()); 2411 } 2412 2413 if (t != NULL && t->is_Java_thread()) { 2414 JavaThread* thread = (JavaThread*) t; 2415 bool in_java = thread->thread_state() == _thread_in_Java; 2416 2417 // Handle potential stack overflows up front. 2418 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2419 if (os::uses_stack_guard_pages()) { 2420#ifdef _M_IA64 2421 // Use guard page for register stack. 2422 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2423 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2424 // Check for a register stack overflow on Itanium 2425 if (thread->addr_inside_register_stack_red_zone(addr)) { 2426 // Fatal red zone violation happens if the Java program 2427 // catches a StackOverflow error and does so much processing 2428 // that it runs beyond the unprotected yellow guard zone. As 2429 // a result, we are out of here. 2430 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit."); 2431 } else if(thread->addr_inside_register_stack(addr)) { 2432 // Disable the yellow zone which sets the state that 2433 // we've got a stack overflow problem. 2434 if (thread->stack_yellow_zone_enabled()) { 2435 thread->disable_stack_yellow_zone(); 2436 } 2437 // Give us some room to process the exception. 2438 thread->disable_register_stack_guard(); 2439 // Tracing with +Verbose. 2440 if (Verbose) { 2441 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc); 2442 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr); 2443 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base()); 2444 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]", 2445 thread->register_stack_base(), 2446 thread->register_stack_base() + thread->stack_size()); 2447 } 2448 2449 // Reguard the permanent register stack red zone just to be sure. 2450 // We saw Windows silently disabling this without telling us. 2451 thread->enable_register_stack_red_zone(); 2452 2453 return Handle_Exception(exceptionInfo, 2454 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2455 } 2456#endif 2457 if (thread->stack_yellow_zone_enabled()) { 2458 // Yellow zone violation. The o/s has unprotected the first yellow 2459 // zone page for us. Note: must call disable_stack_yellow_zone to 2460 // update the enabled status, even if the zone contains only one page. 2461 thread->disable_stack_yellow_zone(); 2462 // If not in java code, return and hope for the best. 2463 return in_java 2464 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2465 : EXCEPTION_CONTINUE_EXECUTION; 2466 } else { 2467 // Fatal red zone violation. 2468 thread->disable_stack_red_zone(); 2469 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2470 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2471 exceptionInfo->ContextRecord); 2472 return EXCEPTION_CONTINUE_SEARCH; 2473 } 2474 } else if (in_java) { 2475 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2476 // a one-time-only guard page, which it has released to us. The next 2477 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2478 return Handle_Exception(exceptionInfo, 2479 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2480 } else { 2481 // Can only return and hope for the best. Further stack growth will 2482 // result in an ACCESS_VIOLATION. 2483 return EXCEPTION_CONTINUE_EXECUTION; 2484 } 2485 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2486 // Either stack overflow or null pointer exception. 2487 if (in_java) { 2488 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2489 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2490 address stack_end = thread->stack_base() - thread->stack_size(); 2491 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2492 // Stack overflow. 2493 assert(!os::uses_stack_guard_pages(), 2494 "should be caught by red zone code above."); 2495 return Handle_Exception(exceptionInfo, 2496 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2497 } 2498 // Check for safepoint polling and implicit null 2499 // We only expect null pointers in the stubs (vtable) 2500 // the rest are checked explicitly now. 2501 CodeBlob* cb = CodeCache::find_blob(pc); 2502 if (cb != NULL) { 2503 if (os::is_poll_address(addr)) { 2504 address stub = SharedRuntime::get_poll_stub(pc); 2505 return Handle_Exception(exceptionInfo, stub); 2506 } 2507 } 2508 { 2509#ifdef _WIN64 2510 // If it's a legal stack address map the entire region in 2511 // 2512 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2513 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2514 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) { 2515 addr = (address)((uintptr_t)addr & 2516 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2517 os::commit_memory((char *)addr, thread->stack_base() - addr, 2518 !ExecMem); 2519 return EXCEPTION_CONTINUE_EXECUTION; 2520 } else 2521#endif 2522 { 2523 // Null pointer exception. 2524#ifdef _M_IA64 2525 // Process implicit null checks in compiled code. Note: Implicit null checks 2526 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs. 2527 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) { 2528 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format); 2529 // Handle implicit null check in UEP method entry 2530 if (cb && (cb->is_frame_complete_at(pc) || 2531 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) { 2532 if (Verbose) { 2533 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0); 2534 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format); 2535 tty->print_cr(" to addr " INTPTR_FORMAT, addr); 2536 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)", 2537 *(bundle_start + 1), *bundle_start); 2538 } 2539 return Handle_Exception(exceptionInfo, 2540 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL)); 2541 } 2542 } 2543 2544 // Implicit null checks were processed above. Hence, we should not reach 2545 // here in the usual case => die! 2546 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception"); 2547 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2548 exceptionInfo->ContextRecord); 2549 return EXCEPTION_CONTINUE_SEARCH; 2550 2551#else // !IA64 2552 2553 // Windows 98 reports faulting addresses incorrectly 2554 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2555 !os::win32::is_nt()) { 2556 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2557 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2558 } 2559 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2560 exceptionInfo->ContextRecord); 2561 return EXCEPTION_CONTINUE_SEARCH; 2562#endif 2563 } 2564 } 2565 } 2566 2567#ifdef _WIN64 2568 // Special care for fast JNI field accessors. 2569 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2570 // in and the heap gets shrunk before the field access. 2571 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2572 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2573 if (addr != (address)-1) { 2574 return Handle_Exception(exceptionInfo, addr); 2575 } 2576 } 2577#endif 2578 2579 // Stack overflow or null pointer exception in native code. 2580 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2581 exceptionInfo->ContextRecord); 2582 return EXCEPTION_CONTINUE_SEARCH; 2583 } // /EXCEPTION_ACCESS_VIOLATION 2584 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2585#if defined _M_IA64 2586 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION || 2587 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) { 2588 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0); 2589 2590 // Compiled method patched to be non entrant? Following conditions must apply: 2591 // 1. must be first instruction in bundle 2592 // 2. must be a break instruction with appropriate code 2593 if ((((uint64_t) pc & 0x0F) == 0) && 2594 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) { 2595 return Handle_Exception(exceptionInfo, 2596 (address)SharedRuntime::get_handle_wrong_method_stub()); 2597 } 2598 } // /EXCEPTION_ILLEGAL_INSTRUCTION 2599#endif 2600 2601 2602 if (in_java) { 2603 switch (exception_code) { 2604 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2605 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2606 2607 case EXCEPTION_INT_OVERFLOW: 2608 return Handle_IDiv_Exception(exceptionInfo); 2609 2610 } // switch 2611 } 2612 if (((thread->thread_state() == _thread_in_Java) || 2613 (thread->thread_state() == _thread_in_native)) && 2614 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) { 2615 LONG result=Handle_FLT_Exception(exceptionInfo); 2616 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2617 } 2618 } 2619 2620 if (exception_code != EXCEPTION_BREAKPOINT) { 2621 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2622 exceptionInfo->ContextRecord); 2623 } 2624 return EXCEPTION_CONTINUE_SEARCH; 2625} 2626 2627#ifndef _WIN64 2628// Special care for fast JNI accessors. 2629// jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2630// the heap gets shrunk before the field access. 2631// Need to install our own structured exception handler since native code may 2632// install its own. 2633LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2634 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2635 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2636 address pc = (address) exceptionInfo->ContextRecord->Eip; 2637 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2638 if (addr != (address)-1) { 2639 return Handle_Exception(exceptionInfo, addr); 2640 } 2641 } 2642 return EXCEPTION_CONTINUE_SEARCH; 2643} 2644 2645#define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \ 2646 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \ 2647 jobject obj, \ 2648 jfieldID fieldID) { \ 2649 __try { \ 2650 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \ 2651 obj, \ 2652 fieldID); \ 2653 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \ 2654 _exception_info())) { \ 2655 } \ 2656 return 0; \ 2657 } 2658 2659DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2660DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2661DEFINE_FAST_GETFIELD(jchar, char, Char) 2662DEFINE_FAST_GETFIELD(jshort, short, Short) 2663DEFINE_FAST_GETFIELD(jint, int, Int) 2664DEFINE_FAST_GETFIELD(jlong, long, Long) 2665DEFINE_FAST_GETFIELD(jfloat, float, Float) 2666DEFINE_FAST_GETFIELD(jdouble, double, Double) 2667 2668address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2669 switch (type) { 2670 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2671 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2672 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2673 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2674 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2675 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2676 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2677 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2678 default: ShouldNotReachHere(); 2679 } 2680 return (address)-1; 2681} 2682#endif 2683 2684void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) { 2685 // Install a win32 structured exception handler around the test 2686 // function call so the VM can generate an error dump if needed. 2687 __try { 2688 (*funcPtr)(); 2689 } __except(topLevelExceptionFilter( 2690 (_EXCEPTION_POINTERS*)_exception_info())) { 2691 // Nothing to do. 2692 } 2693} 2694 2695// Virtual Memory 2696 2697int os::vm_page_size() { return os::win32::vm_page_size(); } 2698int os::vm_allocation_granularity() { 2699 return os::win32::vm_allocation_granularity(); 2700} 2701 2702// Windows large page support is available on Windows 2003. In order to use 2703// large page memory, the administrator must first assign additional privilege 2704// to the user: 2705// + select Control Panel -> Administrative Tools -> Local Security Policy 2706// + select Local Policies -> User Rights Assignment 2707// + double click "Lock pages in memory", add users and/or groups 2708// + reboot 2709// Note the above steps are needed for administrator as well, as administrators 2710// by default do not have the privilege to lock pages in memory. 2711// 2712// Note about Windows 2003: although the API supports committing large page 2713// memory on a page-by-page basis and VirtualAlloc() returns success under this 2714// scenario, I found through experiment it only uses large page if the entire 2715// memory region is reserved and committed in a single VirtualAlloc() call. 2716// This makes Windows large page support more or less like Solaris ISM, in 2717// that the entire heap must be committed upfront. This probably will change 2718// in the future, if so the code below needs to be revisited. 2719 2720#ifndef MEM_LARGE_PAGES 2721 #define MEM_LARGE_PAGES 0x20000000 2722#endif 2723 2724static HANDLE _hProcess; 2725static HANDLE _hToken; 2726 2727// Container for NUMA node list info 2728class NUMANodeListHolder { 2729 private: 2730 int *_numa_used_node_list; // allocated below 2731 int _numa_used_node_count; 2732 2733 void free_node_list() { 2734 if (_numa_used_node_list != NULL) { 2735 FREE_C_HEAP_ARRAY(int, _numa_used_node_list, mtInternal); 2736 } 2737 } 2738 2739 public: 2740 NUMANodeListHolder() { 2741 _numa_used_node_count = 0; 2742 _numa_used_node_list = NULL; 2743 // do rest of initialization in build routine (after function pointers are set up) 2744 } 2745 2746 ~NUMANodeListHolder() { 2747 free_node_list(); 2748 } 2749 2750 bool build() { 2751 DWORD_PTR proc_aff_mask; 2752 DWORD_PTR sys_aff_mask; 2753 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false; 2754 ULONG highest_node_number; 2755 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false; 2756 free_node_list(); 2757 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal); 2758 for (unsigned int i = 0; i <= highest_node_number; i++) { 2759 ULONGLONG proc_mask_numa_node; 2760 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false; 2761 if ((proc_aff_mask & proc_mask_numa_node)!=0) { 2762 _numa_used_node_list[_numa_used_node_count++] = i; 2763 } 2764 } 2765 return (_numa_used_node_count > 1); 2766 } 2767 2768 int get_count() { return _numa_used_node_count; } 2769 int get_node_list_entry(int n) { 2770 // for indexes out of range, returns -1 2771 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1); 2772 } 2773 2774} numa_node_list_holder; 2775 2776 2777 2778static size_t _large_page_size = 0; 2779 2780static bool resolve_functions_for_large_page_init() { 2781 return os::Kernel32Dll::GetLargePageMinimumAvailable() && 2782 os::Advapi32Dll::AdvapiAvailable(); 2783} 2784 2785static bool request_lock_memory_privilege() { 2786 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2787 os::current_process_id()); 2788 2789 LUID luid; 2790 if (_hProcess != NULL && 2791 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2792 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2793 2794 TOKEN_PRIVILEGES tp; 2795 tp.PrivilegeCount = 1; 2796 tp.Privileges[0].Luid = luid; 2797 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2798 2799 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2800 // privilege. Check GetLastError() too. See MSDN document. 2801 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2802 (GetLastError() == ERROR_SUCCESS)) { 2803 return true; 2804 } 2805 } 2806 2807 return false; 2808} 2809 2810static void cleanup_after_large_page_init() { 2811 if (_hProcess) CloseHandle(_hProcess); 2812 _hProcess = NULL; 2813 if (_hToken) CloseHandle(_hToken); 2814 _hToken = NULL; 2815} 2816 2817static bool numa_interleaving_init() { 2818 bool success = false; 2819 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving); 2820 2821 // print a warning if UseNUMAInterleaving flag is specified on command line 2822 bool warn_on_failure = use_numa_interleaving_specified; 2823#define WARN(msg) if (warn_on_failure) { warning(msg); } 2824 2825 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages) 2826 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2827 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity); 2828 2829 if (os::Kernel32Dll::NumaCallsAvailable()) { 2830 if (numa_node_list_holder.build()) { 2831 if (PrintMiscellaneous && Verbose) { 2832 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count()); 2833 for (int i = 0; i < numa_node_list_holder.get_count(); i++) { 2834 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i)); 2835 } 2836 tty->print("\n"); 2837 } 2838 success = true; 2839 } else { 2840 WARN("Process does not cover multiple NUMA nodes."); 2841 } 2842 } else { 2843 WARN("NUMA Interleaving is not supported by the operating system."); 2844 } 2845 if (!success) { 2846 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag."); 2847 } 2848 return success; 2849#undef WARN 2850} 2851 2852// this routine is used whenever we need to reserve a contiguous VA range 2853// but we need to make separate VirtualAlloc calls for each piece of the range 2854// Reasons for doing this: 2855// * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise) 2856// * UseNUMAInterleaving requires a separate node for each piece 2857static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, 2858 DWORD prot, 2859 bool should_inject_error = false) { 2860 char * p_buf; 2861 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size 2862 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2863 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size; 2864 2865 // first reserve enough address space in advance since we want to be 2866 // able to break a single contiguous virtual address range into multiple 2867 // large page commits but WS2003 does not allow reserving large page space 2868 // so we just use 4K pages for reserve, this gives us a legal contiguous 2869 // address space. then we will deallocate that reservation, and re alloc 2870 // using large pages 2871 const size_t size_of_reserve = bytes + chunk_size; 2872 if (bytes > size_of_reserve) { 2873 // Overflowed. 2874 return NULL; 2875 } 2876 p_buf = (char *) VirtualAlloc(addr, 2877 size_of_reserve, // size of Reserve 2878 MEM_RESERVE, 2879 PAGE_READWRITE); 2880 // If reservation failed, return NULL 2881 if (p_buf == NULL) return NULL; 2882 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC); 2883 os::release_memory(p_buf, bytes + chunk_size); 2884 2885 // we still need to round up to a page boundary (in case we are using large pages) 2886 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size) 2887 // instead we handle this in the bytes_to_rq computation below 2888 p_buf = (char *) align_size_up((size_t)p_buf, page_size); 2889 2890 // now go through and allocate one chunk at a time until all bytes are 2891 // allocated 2892 size_t bytes_remaining = bytes; 2893 // An overflow of align_size_up() would have been caught above 2894 // in the calculation of size_of_reserve. 2895 char * next_alloc_addr = p_buf; 2896 HANDLE hProc = GetCurrentProcess(); 2897 2898#ifdef ASSERT 2899 // Variable for the failure injection 2900 long ran_num = os::random(); 2901 size_t fail_after = ran_num % bytes; 2902#endif 2903 2904 int count=0; 2905 while (bytes_remaining) { 2906 // select bytes_to_rq to get to the next chunk_size boundary 2907 2908 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size)); 2909 // Note allocate and commit 2910 char * p_new; 2911 2912#ifdef ASSERT 2913 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after); 2914#else 2915 const bool inject_error_now = false; 2916#endif 2917 2918 if (inject_error_now) { 2919 p_new = NULL; 2920 } else { 2921 if (!UseNUMAInterleaving) { 2922 p_new = (char *) VirtualAlloc(next_alloc_addr, 2923 bytes_to_rq, 2924 flags, 2925 prot); 2926 } else { 2927 // get the next node to use from the used_node_list 2928 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected"); 2929 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count()); 2930 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc, 2931 next_alloc_addr, 2932 bytes_to_rq, 2933 flags, 2934 prot, 2935 node); 2936 } 2937 } 2938 2939 if (p_new == NULL) { 2940 // Free any allocated pages 2941 if (next_alloc_addr > p_buf) { 2942 // Some memory was committed so release it. 2943 size_t bytes_to_release = bytes - bytes_remaining; 2944 // NMT has yet to record any individual blocks, so it 2945 // need to create a dummy 'reserve' record to match 2946 // the release. 2947 MemTracker::record_virtual_memory_reserve((address)p_buf, 2948 bytes_to_release, CALLER_PC); 2949 os::release_memory(p_buf, bytes_to_release); 2950 } 2951#ifdef ASSERT 2952 if (should_inject_error) { 2953 if (TracePageSizes && Verbose) { 2954 tty->print_cr("Reserving pages individually failed."); 2955 } 2956 } 2957#endif 2958 return NULL; 2959 } 2960 2961 bytes_remaining -= bytes_to_rq; 2962 next_alloc_addr += bytes_to_rq; 2963 count++; 2964 } 2965 // Although the memory is allocated individually, it is returned as one. 2966 // NMT records it as one block. 2967 if ((flags & MEM_COMMIT) != 0) { 2968 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC); 2969 } else { 2970 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC); 2971 } 2972 2973 // made it this far, success 2974 return p_buf; 2975} 2976 2977 2978 2979void os::large_page_init() { 2980 if (!UseLargePages) return; 2981 2982 // print a warning if any large page related flag is specified on command line 2983 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2984 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2985 bool success = false; 2986 2987#define WARN(msg) if (warn_on_failure) { warning(msg); } 2988 if (resolve_functions_for_large_page_init()) { 2989 if (request_lock_memory_privilege()) { 2990 size_t s = os::Kernel32Dll::GetLargePageMinimum(); 2991 if (s) { 2992#if defined(IA32) || defined(AMD64) 2993 if (s > 4*M || LargePageSizeInBytes > 4*M) { 2994 WARN("JVM cannot use large pages bigger than 4mb."); 2995 } else { 2996#endif 2997 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 2998 _large_page_size = LargePageSizeInBytes; 2999 } else { 3000 _large_page_size = s; 3001 } 3002 success = true; 3003#if defined(IA32) || defined(AMD64) 3004 } 3005#endif 3006 } else { 3007 WARN("Large page is not supported by the processor."); 3008 } 3009 } else { 3010 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 3011 } 3012 } else { 3013 WARN("Large page is not supported by the operating system."); 3014 } 3015#undef WARN 3016 3017 const size_t default_page_size = (size_t) vm_page_size(); 3018 if (success && _large_page_size > default_page_size) { 3019 _page_sizes[0] = _large_page_size; 3020 _page_sizes[1] = default_page_size; 3021 _page_sizes[2] = 0; 3022 } 3023 3024 cleanup_after_large_page_init(); 3025 UseLargePages = success; 3026} 3027 3028// On win32, one cannot release just a part of reserved memory, it's an 3029// all or nothing deal. When we split a reservation, we must break the 3030// reservation into two reservations. 3031void os::pd_split_reserved_memory(char *base, size_t size, size_t split, 3032 bool realloc) { 3033 if (size > 0) { 3034 release_memory(base, size); 3035 if (realloc) { 3036 reserve_memory(split, base); 3037 } 3038 if (size != split) { 3039 reserve_memory(size - split, base + split); 3040 } 3041 } 3042} 3043 3044// Multiple threads can race in this code but it's not possible to unmap small sections of 3045// virtual space to get requested alignment, like posix-like os's. 3046// Windows prevents multiple thread from remapping over each other so this loop is thread-safe. 3047char* os::reserve_memory_aligned(size_t size, size_t alignment) { 3048 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 3049 "Alignment must be a multiple of allocation granularity (page size)"); 3050 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 3051 3052 size_t extra_size = size + alignment; 3053 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 3054 3055 char* aligned_base = NULL; 3056 3057 do { 3058 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 3059 if (extra_base == NULL) { 3060 return NULL; 3061 } 3062 // Do manual alignment 3063 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 3064 3065 os::release_memory(extra_base, extra_size); 3066 3067 aligned_base = os::reserve_memory(size, aligned_base); 3068 3069 } while (aligned_base == NULL); 3070 3071 return aligned_base; 3072} 3073 3074char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 3075 assert((size_t)addr % os::vm_allocation_granularity() == 0, 3076 "reserve alignment"); 3077 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size"); 3078 char* res; 3079 // note that if UseLargePages is on, all the areas that require interleaving 3080 // will go thru reserve_memory_special rather than thru here. 3081 bool use_individual = (UseNUMAInterleaving && !UseLargePages); 3082 if (!use_individual) { 3083 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 3084 } else { 3085 elapsedTimer reserveTimer; 3086 if (Verbose && PrintMiscellaneous) reserveTimer.start(); 3087 // in numa interleaving, we have to allocate pages individually 3088 // (well really chunks of NUMAInterleaveGranularity size) 3089 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE); 3090 if (res == NULL) { 3091 warning("NUMA page allocation failed"); 3092 } 3093 if (Verbose && PrintMiscellaneous) { 3094 reserveTimer.stop(); 3095 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes, 3096 reserveTimer.milliseconds(), reserveTimer.ticks()); 3097 } 3098 } 3099 assert(res == NULL || addr == NULL || addr == res, 3100 "Unexpected address from reserve."); 3101 3102 return res; 3103} 3104 3105// Reserve memory at an arbitrary address, only if that area is 3106// available (and not reserved for something else). 3107char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3108 // Windows os::reserve_memory() fails of the requested address range is 3109 // not avilable. 3110 return reserve_memory(bytes, requested_addr); 3111} 3112 3113size_t os::large_page_size() { 3114 return _large_page_size; 3115} 3116 3117bool os::can_commit_large_page_memory() { 3118 // Windows only uses large page memory when the entire region is reserved 3119 // and committed in a single VirtualAlloc() call. This may change in the 3120 // future, but with Windows 2003 it's not possible to commit on demand. 3121 return false; 3122} 3123 3124bool os::can_execute_large_page_memory() { 3125 return true; 3126} 3127 3128char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, 3129 bool exec) { 3130 assert(UseLargePages, "only for large pages"); 3131 3132 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { 3133 return NULL; // Fallback to small pages. 3134 } 3135 3136 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 3137 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3138 3139 // with large pages, there are two cases where we need to use Individual Allocation 3140 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003) 3141 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page 3142 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) { 3143 if (TracePageSizes && Verbose) { 3144 tty->print_cr("Reserving large pages individually."); 3145 } 3146 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError); 3147 if (p_buf == NULL) { 3148 // give an appropriate warning message 3149 if (UseNUMAInterleaving) { 3150 warning("NUMA large page allocation failed, UseLargePages flag ignored"); 3151 } 3152 if (UseLargePagesIndividualAllocation) { 3153 warning("Individually allocated large pages failed, " 3154 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 3155 } 3156 return NULL; 3157 } 3158 3159 return p_buf; 3160 3161 } else { 3162 if (TracePageSizes && Verbose) { 3163 tty->print_cr("Reserving large pages in a single large chunk."); 3164 } 3165 // normal policy just allocate it all at once 3166 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3167 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); 3168 if (res != NULL) { 3169 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC); 3170 } 3171 3172 return res; 3173 } 3174} 3175 3176bool os::release_memory_special(char* base, size_t bytes) { 3177 assert(base != NULL, "Sanity check"); 3178 return release_memory(base, bytes); 3179} 3180 3181void os::print_statistics() { 3182} 3183 3184static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) { 3185 int err = os::get_last_error(); 3186 char buf[256]; 3187 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3188 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 3189 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3190 exec, buf_len != 0 ? buf : "<no_error_string>", err); 3191} 3192 3193bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 3194 if (bytes == 0) { 3195 // Don't bother the OS with noops. 3196 return true; 3197 } 3198 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 3199 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 3200 // Don't attempt to print anything if the OS call fails. We're 3201 // probably low on resources, so the print itself may cause crashes. 3202 3203 // unless we have NUMAInterleaving enabled, the range of a commit 3204 // is always within a reserve covered by a single VirtualAlloc 3205 // in that case we can just do a single commit for the requested size 3206 if (!UseNUMAInterleaving) { 3207 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) { 3208 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3209 return false; 3210 } 3211 if (exec) { 3212 DWORD oldprot; 3213 // Windows doc says to use VirtualProtect to get execute permissions 3214 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) { 3215 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3216 return false; 3217 } 3218 } 3219 return true; 3220 } else { 3221 3222 // when NUMAInterleaving is enabled, the commit might cover a range that 3223 // came from multiple VirtualAlloc reserves (using allocate_pages_individually). 3224 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery 3225 // returns represents the number of bytes that can be committed in one step. 3226 size_t bytes_remaining = bytes; 3227 char * next_alloc_addr = addr; 3228 while (bytes_remaining > 0) { 3229 MEMORY_BASIC_INFORMATION alloc_info; 3230 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info)); 3231 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3232 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, 3233 PAGE_READWRITE) == NULL) { 3234 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3235 exec);) 3236 return false; 3237 } 3238 if (exec) { 3239 DWORD oldprot; 3240 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, 3241 PAGE_EXECUTE_READWRITE, &oldprot)) { 3242 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3243 exec);) 3244 return false; 3245 } 3246 } 3247 bytes_remaining -= bytes_to_rq; 3248 next_alloc_addr += bytes_to_rq; 3249 } 3250 } 3251 // if we made it this far, return true 3252 return true; 3253} 3254 3255bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 3256 bool exec) { 3257 // alignment_hint is ignored on this OS 3258 return pd_commit_memory(addr, size, exec); 3259} 3260 3261void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 3262 const char* mesg) { 3263 assert(mesg != NULL, "mesg must be specified"); 3264 if (!pd_commit_memory(addr, size, exec)) { 3265 warn_fail_commit_memory(addr, size, exec); 3266 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); 3267 } 3268} 3269 3270void os::pd_commit_memory_or_exit(char* addr, size_t size, 3271 size_t alignment_hint, bool exec, 3272 const char* mesg) { 3273 // alignment_hint is ignored on this OS 3274 pd_commit_memory_or_exit(addr, size, exec, mesg); 3275} 3276 3277bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3278 if (bytes == 0) { 3279 // Don't bother the OS with noops. 3280 return true; 3281 } 3282 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 3283 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 3284 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0); 3285} 3286 3287bool os::pd_release_memory(char* addr, size_t bytes) { 3288 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 3289} 3290 3291bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 3292 return os::commit_memory(addr, size, !ExecMem); 3293} 3294 3295bool os::remove_stack_guard_pages(char* addr, size_t size) { 3296 return os::uncommit_memory(addr, size); 3297} 3298 3299// Set protections specified 3300bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3301 bool is_committed) { 3302 unsigned int p = 0; 3303 switch (prot) { 3304 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 3305 case MEM_PROT_READ: p = PAGE_READONLY; break; 3306 case MEM_PROT_RW: p = PAGE_READWRITE; break; 3307 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 3308 default: 3309 ShouldNotReachHere(); 3310 } 3311 3312 DWORD old_status; 3313 3314 // Strange enough, but on Win32 one can change protection only for committed 3315 // memory, not a big deal anyway, as bytes less or equal than 64K 3316 if (!is_committed) { 3317 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX, 3318 "cannot commit protection page"); 3319 } 3320 // One cannot use os::guard_memory() here, as on Win32 guard page 3321 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 3322 // 3323 // Pages in the region become guard pages. Any attempt to access a guard page 3324 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 3325 // the guard page status. Guard pages thus act as a one-time access alarm. 3326 return VirtualProtect(addr, bytes, p, &old_status) != 0; 3327} 3328 3329bool os::guard_memory(char* addr, size_t bytes) { 3330 DWORD old_status; 3331 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 3332} 3333 3334bool os::unguard_memory(char* addr, size_t bytes) { 3335 DWORD old_status; 3336 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 3337} 3338 3339void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3340void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3341void os::numa_make_global(char *addr, size_t bytes) { } 3342void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 3343bool os::numa_topology_changed() { return false; } 3344size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); } 3345int os::numa_get_group_id() { return 0; } 3346size_t os::numa_get_leaf_groups(int *ids, size_t size) { 3347 if (numa_node_list_holder.get_count() == 0 && size > 0) { 3348 // Provide an answer for UMA systems 3349 ids[0] = 0; 3350 return 1; 3351 } else { 3352 // check for size bigger than actual groups_num 3353 size = MIN2(size, numa_get_groups_num()); 3354 for (int i = 0; i < (int)size; i++) { 3355 ids[i] = numa_node_list_holder.get_node_list_entry(i); 3356 } 3357 return size; 3358 } 3359} 3360 3361bool os::get_page_info(char *start, page_info* info) { 3362 return false; 3363} 3364 3365char *os::scan_pages(char *start, char* end, page_info* page_expected, 3366 page_info* page_found) { 3367 return end; 3368} 3369 3370char* os::non_memory_address_word() { 3371 // Must never look like an address returned by reserve_memory, 3372 // even in its subfields (as defined by the CPU immediate fields, 3373 // if the CPU splits constants across multiple instructions). 3374 return (char*)-1; 3375} 3376 3377#define MAX_ERROR_COUNT 100 3378#define SYS_THREAD_ERROR 0xffffffffUL 3379 3380void os::pd_start_thread(Thread* thread) { 3381 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 3382 // Returns previous suspend state: 3383 // 0: Thread was not suspended 3384 // 1: Thread is running now 3385 // >1: Thread is still suspended. 3386 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3387} 3388 3389class HighResolutionInterval : public CHeapObj<mtThread> { 3390 // The default timer resolution seems to be 10 milliseconds. 3391 // (Where is this written down?) 3392 // If someone wants to sleep for only a fraction of the default, 3393 // then we set the timer resolution down to 1 millisecond for 3394 // the duration of their interval. 3395 // We carefully set the resolution back, since otherwise we 3396 // seem to incur an overhead (3%?) that we don't need. 3397 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 3398 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 3399 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 3400 // timeBeginPeriod() if the relative error exceeded some threshold. 3401 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 3402 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 3403 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 3404 // resolution timers running. 3405 private: 3406 jlong resolution; 3407 public: 3408 HighResolutionInterval(jlong ms) { 3409 resolution = ms % 10L; 3410 if (resolution != 0) { 3411 MMRESULT result = timeBeginPeriod(1L); 3412 } 3413 } 3414 ~HighResolutionInterval() { 3415 if (resolution != 0) { 3416 MMRESULT result = timeEndPeriod(1L); 3417 } 3418 resolution = 0L; 3419 } 3420}; 3421 3422int os::sleep(Thread* thread, jlong ms, bool interruptable) { 3423 jlong limit = (jlong) MAXDWORD; 3424 3425 while (ms > limit) { 3426 int res; 3427 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) { 3428 return res; 3429 } 3430 ms -= limit; 3431 } 3432 3433 assert(thread == Thread::current(), "thread consistency check"); 3434 OSThread* osthread = thread->osthread(); 3435 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 3436 int result; 3437 if (interruptable) { 3438 assert(thread->is_Java_thread(), "must be java thread"); 3439 JavaThread *jt = (JavaThread *) thread; 3440 ThreadBlockInVM tbivm(jt); 3441 3442 jt->set_suspend_equivalent(); 3443 // cleared by handle_special_suspend_equivalent_condition() or 3444 // java_suspend_self() via check_and_wait_while_suspended() 3445 3446 HANDLE events[1]; 3447 events[0] = osthread->interrupt_event(); 3448 HighResolutionInterval *phri=NULL; 3449 if (!ForceTimeHighResolution) { 3450 phri = new HighResolutionInterval(ms); 3451 } 3452 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 3453 result = OS_TIMEOUT; 3454 } else { 3455 ResetEvent(osthread->interrupt_event()); 3456 osthread->set_interrupted(false); 3457 result = OS_INTRPT; 3458 } 3459 delete phri; //if it is NULL, harmless 3460 3461 // were we externally suspended while we were waiting? 3462 jt->check_and_wait_while_suspended(); 3463 } else { 3464 assert(!thread->is_Java_thread(), "must not be java thread"); 3465 Sleep((long) ms); 3466 result = OS_TIMEOUT; 3467 } 3468 return result; 3469} 3470 3471// Short sleep, direct OS call. 3472// 3473// ms = 0, means allow others (if any) to run. 3474// 3475void os::naked_short_sleep(jlong ms) { 3476 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3477 Sleep(ms); 3478} 3479 3480// Sleep forever; naked call to OS-specific sleep; use with CAUTION 3481void os::infinite_sleep() { 3482 while (true) { // sleep forever ... 3483 Sleep(100000); // ... 100 seconds at a time 3484 } 3485} 3486 3487typedef BOOL (WINAPI * STTSignature)(void); 3488 3489void os::naked_yield() { 3490 // Use either SwitchToThread() or Sleep(0) 3491 // Consider passing back the return value from SwitchToThread(). 3492 if (os::Kernel32Dll::SwitchToThreadAvailable()) { 3493 SwitchToThread(); 3494 } else { 3495 Sleep(0); 3496 } 3497} 3498 3499// Win32 only gives you access to seven real priorities at a time, 3500// so we compress Java's ten down to seven. It would be better 3501// if we dynamically adjusted relative priorities. 3502 3503int os::java_to_os_priority[CriticalPriority + 1] = { 3504 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3505 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3506 THREAD_PRIORITY_LOWEST, // 2 3507 THREAD_PRIORITY_BELOW_NORMAL, // 3 3508 THREAD_PRIORITY_BELOW_NORMAL, // 4 3509 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3510 THREAD_PRIORITY_NORMAL, // 6 3511 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3512 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3513 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3514 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority 3515 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority 3516}; 3517 3518int prio_policy1[CriticalPriority + 1] = { 3519 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3520 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3521 THREAD_PRIORITY_LOWEST, // 2 3522 THREAD_PRIORITY_BELOW_NORMAL, // 3 3523 THREAD_PRIORITY_BELOW_NORMAL, // 4 3524 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3525 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3526 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3527 THREAD_PRIORITY_HIGHEST, // 8 3528 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3529 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority 3530 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority 3531}; 3532 3533static int prio_init() { 3534 // If ThreadPriorityPolicy is 1, switch tables 3535 if (ThreadPriorityPolicy == 1) { 3536 int i; 3537 for (i = 0; i < CriticalPriority + 1; i++) { 3538 os::java_to_os_priority[i] = prio_policy1[i]; 3539 } 3540 } 3541 if (UseCriticalJavaThreadPriority) { 3542 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 3543 } 3544 return 0; 3545} 3546 3547OSReturn os::set_native_priority(Thread* thread, int priority) { 3548 if (!UseThreadPriorities) return OS_OK; 3549 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3550 return ret ? OS_OK : OS_ERR; 3551} 3552 3553OSReturn os::get_native_priority(const Thread* const thread, 3554 int* priority_ptr) { 3555 if (!UseThreadPriorities) { 3556 *priority_ptr = java_to_os_priority[NormPriority]; 3557 return OS_OK; 3558 } 3559 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3560 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3561 assert(false, "GetThreadPriority failed"); 3562 return OS_ERR; 3563 } 3564 *priority_ptr = os_prio; 3565 return OS_OK; 3566} 3567 3568 3569// Hint to the underlying OS that a task switch would not be good. 3570// Void return because it's a hint and can fail. 3571void os::hint_no_preempt() {} 3572 3573void os::interrupt(Thread* thread) { 3574 assert(!thread->is_Java_thread() || Thread::current() == thread || 3575 Threads_lock->owned_by_self(), 3576 "possibility of dangling Thread pointer"); 3577 3578 OSThread* osthread = thread->osthread(); 3579 osthread->set_interrupted(true); 3580 // More than one thread can get here with the same value of osthread, 3581 // resulting in multiple notifications. We do, however, want the store 3582 // to interrupted() to be visible to other threads before we post 3583 // the interrupt event. 3584 OrderAccess::release(); 3585 SetEvent(osthread->interrupt_event()); 3586 // For JSR166: unpark after setting status 3587 if (thread->is_Java_thread()) { 3588 ((JavaThread*)thread)->parker()->unpark(); 3589 } 3590 3591 ParkEvent * ev = thread->_ParkEvent; 3592 if (ev != NULL) ev->unpark(); 3593} 3594 3595 3596bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3597 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3598 "possibility of dangling Thread pointer"); 3599 3600 OSThread* osthread = thread->osthread(); 3601 // There is no synchronization between the setting of the interrupt 3602 // and it being cleared here. It is critical - see 6535709 - that 3603 // we only clear the interrupt state, and reset the interrupt event, 3604 // if we are going to report that we were indeed interrupted - else 3605 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups 3606 // depending on the timing. By checking thread interrupt event to see 3607 // if the thread gets real interrupt thus prevent spurious wakeup. 3608 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0); 3609 if (interrupted && clear_interrupted) { 3610 osthread->set_interrupted(false); 3611 ResetEvent(osthread->interrupt_event()); 3612 } // Otherwise leave the interrupted state alone 3613 3614 return interrupted; 3615} 3616 3617// Get's a pc (hint) for a running thread. Currently used only for profiling. 3618ExtendedPC os::get_thread_pc(Thread* thread) { 3619 CONTEXT context; 3620 context.ContextFlags = CONTEXT_CONTROL; 3621 HANDLE handle = thread->osthread()->thread_handle(); 3622#ifdef _M_IA64 3623 assert(0, "Fix get_thread_pc"); 3624 return ExtendedPC(NULL); 3625#else 3626 if (GetThreadContext(handle, &context)) { 3627#ifdef _M_AMD64 3628 return ExtendedPC((address) context.Rip); 3629#else 3630 return ExtendedPC((address) context.Eip); 3631#endif 3632 } else { 3633 return ExtendedPC(NULL); 3634 } 3635#endif 3636} 3637 3638// GetCurrentThreadId() returns DWORD 3639intx os::current_thread_id() { return GetCurrentThreadId(); } 3640 3641static int _initial_pid = 0; 3642 3643int os::current_process_id() { 3644 return (_initial_pid ? _initial_pid : _getpid()); 3645} 3646 3647int os::win32::_vm_page_size = 0; 3648int os::win32::_vm_allocation_granularity = 0; 3649int os::win32::_processor_type = 0; 3650// Processor level is not available on non-NT systems, use vm_version instead 3651int os::win32::_processor_level = 0; 3652julong os::win32::_physical_memory = 0; 3653size_t os::win32::_default_stack_size = 0; 3654 3655intx os::win32::_os_thread_limit = 0; 3656volatile intx os::win32::_os_thread_count = 0; 3657 3658bool os::win32::_is_nt = false; 3659bool os::win32::_is_windows_2003 = false; 3660bool os::win32::_is_windows_server = false; 3661 3662// 6573254 3663// Currently, the bug is observed across all the supported Windows releases, 3664// including the latest one (as of this writing - Windows Server 2012 R2) 3665bool os::win32::_has_exit_bug = true; 3666bool os::win32::_has_performance_count = 0; 3667 3668void os::win32::initialize_system_info() { 3669 SYSTEM_INFO si; 3670 GetSystemInfo(&si); 3671 _vm_page_size = si.dwPageSize; 3672 _vm_allocation_granularity = si.dwAllocationGranularity; 3673 _processor_type = si.dwProcessorType; 3674 _processor_level = si.wProcessorLevel; 3675 set_processor_count(si.dwNumberOfProcessors); 3676 3677 MEMORYSTATUSEX ms; 3678 ms.dwLength = sizeof(ms); 3679 3680 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3681 // dwMemoryLoad (% of memory in use) 3682 GlobalMemoryStatusEx(&ms); 3683 _physical_memory = ms.ullTotalPhys; 3684 3685 OSVERSIONINFOEX oi; 3686 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 3687 GetVersionEx((OSVERSIONINFO*)&oi); 3688 switch (oi.dwPlatformId) { 3689 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 3690 case VER_PLATFORM_WIN32_NT: 3691 _is_nt = true; 3692 { 3693 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3694 if (os_vers == 5002) { 3695 _is_windows_2003 = true; 3696 } 3697 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER || 3698 oi.wProductType == VER_NT_SERVER) { 3699 _is_windows_server = true; 3700 } 3701 } 3702 break; 3703 default: fatal("Unknown platform"); 3704 } 3705 3706 _default_stack_size = os::current_stack_size(); 3707 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3708 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3709 "stack size not a multiple of page size"); 3710 3711 initialize_performance_counter(); 3712 3713 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is 3714 // known to deadlock the system, if the VM issues to thread operations with 3715 // a too high frequency, e.g., such as changing the priorities. 3716 // The 6000 seems to work well - no deadlocks has been notices on the test 3717 // programs that we have seen experience this problem. 3718 if (!os::win32::is_nt()) { 3719 StarvationMonitorInterval = 6000; 3720 } 3721} 3722 3723 3724HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, 3725 int ebuflen) { 3726 char path[MAX_PATH]; 3727 DWORD size; 3728 DWORD pathLen = (DWORD)sizeof(path); 3729 HINSTANCE result = NULL; 3730 3731 // only allow library name without path component 3732 assert(strchr(name, '\\') == NULL, "path not allowed"); 3733 assert(strchr(name, ':') == NULL, "path not allowed"); 3734 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) { 3735 jio_snprintf(ebuf, ebuflen, 3736 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name); 3737 return NULL; 3738 } 3739 3740 // search system directory 3741 if ((size = GetSystemDirectory(path, pathLen)) > 0) { 3742 if (size >= pathLen) { 3743 return NULL; // truncated 3744 } 3745 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3746 return NULL; // truncated 3747 } 3748 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3749 return result; 3750 } 3751 } 3752 3753 // try Windows directory 3754 if ((size = GetWindowsDirectory(path, pathLen)) > 0) { 3755 if (size >= pathLen) { 3756 return NULL; // truncated 3757 } 3758 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3759 return NULL; // truncated 3760 } 3761 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3762 return result; 3763 } 3764 } 3765 3766 jio_snprintf(ebuf, ebuflen, 3767 "os::win32::load_windows_dll() cannot load %s from system directories.", name); 3768 return NULL; 3769} 3770 3771#define MAX_EXIT_HANDLES 16 3772#define EXIT_TIMEOUT 1000 /* 1 sec */ 3773 3774static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) { 3775 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect); 3776 return TRUE; 3777} 3778 3779int os::win32::exit_process_or_thread(Ept what, int exit_code) { 3780 // Basic approach: 3781 // - Each exiting thread registers its intent to exit and then does so. 3782 // - A thread trying to terminate the process must wait for all 3783 // threads currently exiting to complete their exit. 3784 3785 if (os::win32::has_exit_bug()) { 3786 // The array holds handles of the threads that have started exiting by calling 3787 // _endthreadex(). 3788 // Should be large enough to avoid blocking the exiting thread due to lack of 3789 // a free slot. 3790 static HANDLE handles[MAX_EXIT_HANDLES]; 3791 static int handle_count = 0; 3792 3793 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT; 3794 static CRITICAL_SECTION crit_sect; 3795 int i, j; 3796 DWORD res; 3797 HANDLE hproc, hthr; 3798 3799 // The first thread that reached this point, initializes the critical section. 3800 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) { 3801 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__); 3802 } else { 3803 EnterCriticalSection(&crit_sect); 3804 3805 if (what == EPT_THREAD) { 3806 // Remove from the array those handles of the threads that have completed exiting. 3807 for (i = 0, j = 0; i < handle_count; ++i) { 3808 res = WaitForSingleObject(handles[i], 0 /* don't wait */); 3809 if (res == WAIT_TIMEOUT) { 3810 handles[j++] = handles[i]; 3811 } else { 3812 if (res != WAIT_OBJECT_0) { 3813 warning("WaitForSingleObject failed in %s: %d\n", __FILE__, __LINE__); 3814 // Don't keep the handle, if we failed waiting for it. 3815 } 3816 CloseHandle(handles[i]); 3817 } 3818 } 3819 3820 // If there's no free slot in the array of the kept handles, we'll have to 3821 // wait until at least one thread completes exiting. 3822 if ((handle_count = j) == MAX_EXIT_HANDLES) { 3823 res = WaitForMultipleObjects(MAX_EXIT_HANDLES, handles, FALSE, EXIT_TIMEOUT); 3824 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAX_EXIT_HANDLES)) { 3825 i = (res - WAIT_OBJECT_0); 3826 handle_count = MAX_EXIT_HANDLES - 1; 3827 for (; i < handle_count; ++i) { 3828 handles[i] = handles[i + 1]; 3829 } 3830 } else { 3831 warning("WaitForMultipleObjects failed in %s: %d\n", __FILE__, __LINE__); 3832 // Don't keep handles, if we failed waiting for them. 3833 for (i = 0; i < MAX_EXIT_HANDLES; ++i) { 3834 CloseHandle(handles[i]); 3835 } 3836 handle_count = 0; 3837 } 3838 } 3839 3840 // Store a duplicate of the current thread handle in the array of handles. 3841 hproc = GetCurrentProcess(); 3842 hthr = GetCurrentThread(); 3843 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count], 3844 0, FALSE, DUPLICATE_SAME_ACCESS)) { 3845 warning("DuplicateHandle failed in %s: %d\n", __FILE__, __LINE__); 3846 } else { 3847 ++handle_count; 3848 } 3849 3850 // The current exiting thread has stored its handle in the array, and now 3851 // should leave the critical section before calling _endthreadex(). 3852 3853 } else { // what != EPT_THREAD 3854 if (handle_count > 0) { 3855 // Before ending the process, make sure all the threads that had called 3856 // _endthreadex() completed. 3857 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT); 3858 if (res == WAIT_FAILED) { 3859 warning("WaitForMultipleObjects failed in %s: %d\n", __FILE__, __LINE__); 3860 } 3861 for (i = 0; i < handle_count; ++i) { 3862 CloseHandle(handles[i]); 3863 } 3864 handle_count = 0; 3865 } 3866 3867 // End the process, not leaving critical section. 3868 // This makes sure no other thread executes exit-related code at the same 3869 // time, thus a race is avoided. 3870 if (what == EPT_PROCESS) { 3871 ::exit(exit_code); 3872 } else { 3873 _exit(exit_code); 3874 } 3875 } 3876 3877 LeaveCriticalSection(&crit_sect); 3878 } 3879 } 3880 3881 // We are here if either 3882 // - there's no 'race at exit' bug on this OS release; 3883 // - initialization of the critical section failed (unlikely); 3884 // - the current thread has stored its handle and left the critical section. 3885 if (what == EPT_THREAD) { 3886 _endthreadex((unsigned)exit_code); 3887 } else if (what == EPT_PROCESS) { 3888 ::exit(exit_code); 3889 } else { 3890 _exit(exit_code); 3891 } 3892 3893 // Should not reach here 3894 return exit_code; 3895} 3896 3897#undef MAX_EXIT_HANDLES 3898#undef EXIT_TIMEOUT 3899 3900void os::win32::setmode_streams() { 3901 _setmode(_fileno(stdin), _O_BINARY); 3902 _setmode(_fileno(stdout), _O_BINARY); 3903 _setmode(_fileno(stderr), _O_BINARY); 3904} 3905 3906 3907bool os::is_debugger_attached() { 3908 return IsDebuggerPresent() ? true : false; 3909} 3910 3911 3912void os::wait_for_keypress_at_exit(void) { 3913 if (PauseAtExit) { 3914 fprintf(stderr, "Press any key to continue...\n"); 3915 fgetc(stdin); 3916 } 3917} 3918 3919 3920int os::message_box(const char* title, const char* message) { 3921 int result = MessageBox(NULL, message, title, 3922 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 3923 return result == IDYES; 3924} 3925 3926int os::allocate_thread_local_storage() { 3927 return TlsAlloc(); 3928} 3929 3930 3931void os::free_thread_local_storage(int index) { 3932 TlsFree(index); 3933} 3934 3935 3936void os::thread_local_storage_at_put(int index, void* value) { 3937 TlsSetValue(index, value); 3938 assert(thread_local_storage_at(index) == value, "Just checking"); 3939} 3940 3941 3942void* os::thread_local_storage_at(int index) { 3943 return TlsGetValue(index); 3944} 3945 3946 3947#ifndef PRODUCT 3948#ifndef _WIN64 3949// Helpers to check whether NX protection is enabled 3950int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 3951 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 3952 pex->ExceptionRecord->NumberParameters > 0 && 3953 pex->ExceptionRecord->ExceptionInformation[0] == 3954 EXCEPTION_INFO_EXEC_VIOLATION) { 3955 return EXCEPTION_EXECUTE_HANDLER; 3956 } 3957 return EXCEPTION_CONTINUE_SEARCH; 3958} 3959 3960void nx_check_protection() { 3961 // If NX is enabled we'll get an exception calling into code on the stack 3962 char code[] = { (char)0xC3 }; // ret 3963 void *code_ptr = (void *)code; 3964 __try { 3965 __asm call code_ptr 3966 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 3967 tty->print_raw_cr("NX protection detected."); 3968 } 3969} 3970#endif // _WIN64 3971#endif // PRODUCT 3972 3973// this is called _before_ the global arguments have been parsed 3974void os::init(void) { 3975 _initial_pid = _getpid(); 3976 3977 init_random(1234567); 3978 3979 win32::initialize_system_info(); 3980 win32::setmode_streams(); 3981 init_page_sizes((size_t) win32::vm_page_size()); 3982 3983 // This may be overridden later when argument processing is done. 3984 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, 3985 os::win32::is_windows_2003()); 3986 3987 // Initialize main_process and main_thread 3988 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 3989 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 3990 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 3991 fatal("DuplicateHandle failed\n"); 3992 } 3993 main_thread_id = (int) GetCurrentThreadId(); 3994} 3995 3996// To install functions for atexit processing 3997extern "C" { 3998 static void perfMemory_exit_helper() { 3999 perfMemory_exit(); 4000 } 4001} 4002 4003static jint initSock(); 4004 4005// this is called _after_ the global arguments have been parsed 4006jint os::init_2(void) { 4007 // Allocate a single page and mark it as readable for safepoint polling 4008 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 4009 guarantee(polling_page != NULL, "Reserve Failed for polling page"); 4010 4011 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 4012 guarantee(return_page != NULL, "Commit Failed for polling page"); 4013 4014 os::set_polling_page(polling_page); 4015 4016#ifndef PRODUCT 4017 if (Verbose && PrintMiscellaneous) { 4018 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", 4019 (intptr_t)polling_page); 4020 } 4021#endif 4022 4023 if (!UseMembar) { 4024 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE); 4025 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 4026 4027 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE); 4028 guarantee(return_page != NULL, "Commit Failed for memory serialize page"); 4029 4030 os::set_memory_serialize_page(mem_serialize_page); 4031 4032#ifndef PRODUCT 4033 if (Verbose && PrintMiscellaneous) { 4034 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", 4035 (intptr_t)mem_serialize_page); 4036 } 4037#endif 4038 } 4039 4040 // Setup Windows Exceptions 4041 4042 // for debugging float code generation bugs 4043 if (ForceFloatExceptions) { 4044#ifndef _WIN64 4045 static long fp_control_word = 0; 4046 __asm { fstcw fp_control_word } 4047 // see Intel PPro Manual, Vol. 2, p 7-16 4048 const long precision = 0x20; 4049 const long underflow = 0x10; 4050 const long overflow = 0x08; 4051 const long zero_div = 0x04; 4052 const long denorm = 0x02; 4053 const long invalid = 0x01; 4054 fp_control_word |= invalid; 4055 __asm { fldcw fp_control_word } 4056#endif 4057 } 4058 4059 // If stack_commit_size is 0, windows will reserve the default size, 4060 // but only commit a small portion of it. 4061 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 4062 size_t default_reserve_size = os::win32::default_stack_size(); 4063 size_t actual_reserve_size = stack_commit_size; 4064 if (stack_commit_size < default_reserve_size) { 4065 // If stack_commit_size == 0, we want this too 4066 actual_reserve_size = default_reserve_size; 4067 } 4068 4069 // Check minimum allowable stack size for thread creation and to initialize 4070 // the java system classes, including StackOverflowError - depends on page 4071 // size. Add a page for compiler2 recursion in main thread. 4072 // Add in 2*BytesPerWord times page size to account for VM stack during 4073 // class initialization depending on 32 or 64 bit VM. 4074 size_t min_stack_allowed = 4075 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 4076 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size(); 4077 if (actual_reserve_size < min_stack_allowed) { 4078 tty->print_cr("\nThe stack size specified is too small, " 4079 "Specify at least %dk", 4080 min_stack_allowed / K); 4081 return JNI_ERR; 4082 } 4083 4084 JavaThread::set_stack_size_at_create(stack_commit_size); 4085 4086 // Calculate theoretical max. size of Threads to guard gainst artifical 4087 // out-of-memory situations, where all available address-space has been 4088 // reserved by thread stacks. 4089 assert(actual_reserve_size != 0, "Must have a stack"); 4090 4091 // Calculate the thread limit when we should start doing Virtual Memory 4092 // banging. Currently when the threads will have used all but 200Mb of space. 4093 // 4094 // TODO: consider performing a similar calculation for commit size instead 4095 // as reserve size, since on a 64-bit platform we'll run into that more 4096 // often than running out of virtual memory space. We can use the 4097 // lower value of the two calculations as the os_thread_limit. 4098 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 4099 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 4100 4101 // at exit methods are called in the reverse order of their registration. 4102 // there is no limit to the number of functions registered. atexit does 4103 // not set errno. 4104 4105 if (PerfAllowAtExitRegistration) { 4106 // only register atexit functions if PerfAllowAtExitRegistration is set. 4107 // atexit functions can be delayed until process exit time, which 4108 // can be problematic for embedded VM situations. Embedded VMs should 4109 // call DestroyJavaVM() to assure that VM resources are released. 4110 4111 // note: perfMemory_exit_helper atexit function may be removed in 4112 // the future if the appropriate cleanup code can be added to the 4113 // VM_Exit VMOperation's doit method. 4114 if (atexit(perfMemory_exit_helper) != 0) { 4115 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 4116 } 4117 } 4118 4119#ifndef _WIN64 4120 // Print something if NX is enabled (win32 on AMD64) 4121 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 4122#endif 4123 4124 // initialize thread priority policy 4125 prio_init(); 4126 4127 if (UseNUMA && !ForceNUMA) { 4128 UseNUMA = false; // We don't fully support this yet 4129 } 4130 4131 if (UseNUMAInterleaving) { 4132 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag 4133 bool success = numa_interleaving_init(); 4134 if (!success) UseNUMAInterleaving = false; 4135 } 4136 4137 if (initSock() != JNI_OK) { 4138 return JNI_ERR; 4139 } 4140 4141 return JNI_OK; 4142} 4143 4144// Mark the polling page as unreadable 4145void os::make_polling_page_unreadable(void) { 4146 DWORD old_status; 4147 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4148 PAGE_NOACCESS, &old_status)) { 4149 fatal("Could not disable polling page"); 4150 } 4151} 4152 4153// Mark the polling page as readable 4154void os::make_polling_page_readable(void) { 4155 DWORD old_status; 4156 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4157 PAGE_READONLY, &old_status)) { 4158 fatal("Could not enable polling page"); 4159 } 4160} 4161 4162 4163int os::stat(const char *path, struct stat *sbuf) { 4164 char pathbuf[MAX_PATH]; 4165 if (strlen(path) > MAX_PATH - 1) { 4166 errno = ENAMETOOLONG; 4167 return -1; 4168 } 4169 os::native_path(strcpy(pathbuf, path)); 4170 int ret = ::stat(pathbuf, sbuf); 4171 if (sbuf != NULL && UseUTCFileTimestamp) { 4172 // Fix for 6539723. st_mtime returned from stat() is dependent on 4173 // the system timezone and so can return different values for the 4174 // same file if/when daylight savings time changes. This adjustment 4175 // makes sure the same timestamp is returned regardless of the TZ. 4176 // 4177 // See: 4178 // http://msdn.microsoft.com/library/ 4179 // default.asp?url=/library/en-us/sysinfo/base/ 4180 // time_zone_information_str.asp 4181 // and 4182 // http://msdn.microsoft.com/library/default.asp?url= 4183 // /library/en-us/sysinfo/base/settimezoneinformation.asp 4184 // 4185 // NOTE: there is a insidious bug here: If the timezone is changed 4186 // after the call to stat() but before 'GetTimeZoneInformation()', then 4187 // the adjustment we do here will be wrong and we'll return the wrong 4188 // value (which will likely end up creating an invalid class data 4189 // archive). Absent a better API for this, or some time zone locking 4190 // mechanism, we'll have to live with this risk. 4191 TIME_ZONE_INFORMATION tz; 4192 DWORD tzid = GetTimeZoneInformation(&tz); 4193 int daylightBias = 4194 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 4195 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 4196 } 4197 return ret; 4198} 4199 4200 4201#define FT2INT64(ft) \ 4202 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 4203 4204 4205// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4206// are used by JVM M&M and JVMTI to get user+sys or user CPU time 4207// of a thread. 4208// 4209// current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4210// the fast estimate available on the platform. 4211 4212// current_thread_cpu_time() is not optimized for Windows yet 4213jlong os::current_thread_cpu_time() { 4214 // return user + sys since the cost is the same 4215 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 4216} 4217 4218jlong os::thread_cpu_time(Thread* thread) { 4219 // consistent with what current_thread_cpu_time() returns. 4220 return os::thread_cpu_time(thread, true /* user+sys */); 4221} 4222 4223jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4224 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4225} 4226 4227jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 4228 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 4229 // If this function changes, os::is_thread_cpu_time_supported() should too 4230 if (os::win32::is_nt()) { 4231 FILETIME CreationTime; 4232 FILETIME ExitTime; 4233 FILETIME KernelTime; 4234 FILETIME UserTime; 4235 4236 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime, 4237 &ExitTime, &KernelTime, &UserTime) == 0) { 4238 return -1; 4239 } else if (user_sys_cpu_time) { 4240 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 4241 } else { 4242 return FT2INT64(UserTime) * 100; 4243 } 4244 } else { 4245 return (jlong) timeGetTime() * 1000000; 4246 } 4247} 4248 4249void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4250 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4251 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4252 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4253 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4254} 4255 4256void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4257 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4258 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4259 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4260 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4261} 4262 4263bool os::is_thread_cpu_time_supported() { 4264 // see os::thread_cpu_time 4265 if (os::win32::is_nt()) { 4266 FILETIME CreationTime; 4267 FILETIME ExitTime; 4268 FILETIME KernelTime; 4269 FILETIME UserTime; 4270 4271 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime, 4272 &KernelTime, &UserTime) == 0) { 4273 return false; 4274 } else { 4275 return true; 4276 } 4277 } else { 4278 return false; 4279 } 4280} 4281 4282// Windows does't provide a loadavg primitive so this is stubbed out for now. 4283// It does have primitives (PDH API) to get CPU usage and run queue length. 4284// "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 4285// If we wanted to implement loadavg on Windows, we have a few options: 4286// 4287// a) Query CPU usage and run queue length and "fake" an answer by 4288// returning the CPU usage if it's under 100%, and the run queue 4289// length otherwise. It turns out that querying is pretty slow 4290// on Windows, on the order of 200 microseconds on a fast machine. 4291// Note that on the Windows the CPU usage value is the % usage 4292// since the last time the API was called (and the first call 4293// returns 100%), so we'd have to deal with that as well. 4294// 4295// b) Sample the "fake" answer using a sampling thread and store 4296// the answer in a global variable. The call to loadavg would 4297// just return the value of the global, avoiding the slow query. 4298// 4299// c) Sample a better answer using exponential decay to smooth the 4300// value. This is basically the algorithm used by UNIX kernels. 4301// 4302// Note that sampling thread starvation could affect both (b) and (c). 4303int os::loadavg(double loadavg[], int nelem) { 4304 return -1; 4305} 4306 4307 4308// DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 4309bool os::dont_yield() { 4310 return DontYieldALot; 4311} 4312 4313// This method is a slightly reworked copy of JDK's sysOpen 4314// from src/windows/hpi/src/sys_api_md.c 4315 4316int os::open(const char *path, int oflag, int mode) { 4317 char pathbuf[MAX_PATH]; 4318 4319 if (strlen(path) > MAX_PATH - 1) { 4320 errno = ENAMETOOLONG; 4321 return -1; 4322 } 4323 os::native_path(strcpy(pathbuf, path)); 4324 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 4325} 4326 4327FILE* os::open(int fd, const char* mode) { 4328 return ::_fdopen(fd, mode); 4329} 4330 4331// Is a (classpath) directory empty? 4332bool os::dir_is_empty(const char* path) { 4333 WIN32_FIND_DATA fd; 4334 HANDLE f = FindFirstFile(path, &fd); 4335 if (f == INVALID_HANDLE_VALUE) { 4336 return true; 4337 } 4338 FindClose(f); 4339 return false; 4340} 4341 4342// create binary file, rewriting existing file if required 4343int os::create_binary_file(const char* path, bool rewrite_existing) { 4344 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 4345 if (!rewrite_existing) { 4346 oflags |= _O_EXCL; 4347 } 4348 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 4349} 4350 4351// return current position of file pointer 4352jlong os::current_file_offset(int fd) { 4353 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 4354} 4355 4356// move file pointer to the specified offset 4357jlong os::seek_to_file_offset(int fd, jlong offset) { 4358 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 4359} 4360 4361 4362jlong os::lseek(int fd, jlong offset, int whence) { 4363 return (jlong) ::_lseeki64(fd, offset, whence); 4364} 4365 4366size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 4367 OVERLAPPED ov; 4368 DWORD nread; 4369 BOOL result; 4370 4371 ZeroMemory(&ov, sizeof(ov)); 4372 ov.Offset = (DWORD)offset; 4373 ov.OffsetHigh = (DWORD)(offset >> 32); 4374 4375 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4376 4377 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov); 4378 4379 return result ? nread : 0; 4380} 4381 4382 4383// This method is a slightly reworked copy of JDK's sysNativePath 4384// from src/windows/hpi/src/path_md.c 4385 4386// Convert a pathname to native format. On win32, this involves forcing all 4387// separators to be '\\' rather than '/' (both are legal inputs, but Win95 4388// sometimes rejects '/') and removing redundant separators. The input path is 4389// assumed to have been converted into the character encoding used by the local 4390// system. Because this might be a double-byte encoding, care is taken to 4391// treat double-byte lead characters correctly. 4392// 4393// This procedure modifies the given path in place, as the result is never 4394// longer than the original. There is no error return; this operation always 4395// succeeds. 4396char * os::native_path(char *path) { 4397 char *src = path, *dst = path, *end = path; 4398 char *colon = NULL; // If a drive specifier is found, this will 4399 // point to the colon following the drive letter 4400 4401 // Assumption: '/', '\\', ':', and drive letters are never lead bytes 4402 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\')) 4403 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte"); 4404 4405 // Check for leading separators 4406#define isfilesep(c) ((c) == '/' || (c) == '\\') 4407 while (isfilesep(*src)) { 4408 src++; 4409 } 4410 4411 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 4412 // Remove leading separators if followed by drive specifier. This 4413 // hack is necessary to support file URLs containing drive 4414 // specifiers (e.g., "file://c:/path"). As a side effect, 4415 // "/c:/path" can be used as an alternative to "c:/path". 4416 *dst++ = *src++; 4417 colon = dst; 4418 *dst++ = ':'; 4419 src++; 4420 } else { 4421 src = path; 4422 if (isfilesep(src[0]) && isfilesep(src[1])) { 4423 // UNC pathname: Retain first separator; leave src pointed at 4424 // second separator so that further separators will be collapsed 4425 // into the second separator. The result will be a pathname 4426 // beginning with "\\\\" followed (most likely) by a host name. 4427 src = dst = path + 1; 4428 path[0] = '\\'; // Force first separator to '\\' 4429 } 4430 } 4431 4432 end = dst; 4433 4434 // Remove redundant separators from remainder of path, forcing all 4435 // separators to be '\\' rather than '/'. Also, single byte space 4436 // characters are removed from the end of the path because those 4437 // are not legal ending characters on this operating system. 4438 // 4439 while (*src != '\0') { 4440 if (isfilesep(*src)) { 4441 *dst++ = '\\'; src++; 4442 while (isfilesep(*src)) src++; 4443 if (*src == '\0') { 4444 // Check for trailing separator 4445 end = dst; 4446 if (colon == dst - 2) break; // "z:\\" 4447 if (dst == path + 1) break; // "\\" 4448 if (dst == path + 2 && isfilesep(path[0])) { 4449 // "\\\\" is not collapsed to "\\" because "\\\\" marks the 4450 // beginning of a UNC pathname. Even though it is not, by 4451 // itself, a valid UNC pathname, we leave it as is in order 4452 // to be consistent with the path canonicalizer as well 4453 // as the win32 APIs, which treat this case as an invalid 4454 // UNC pathname rather than as an alias for the root 4455 // directory of the current drive. 4456 break; 4457 } 4458 end = --dst; // Path does not denote a root directory, so 4459 // remove trailing separator 4460 break; 4461 } 4462 end = dst; 4463 } else { 4464 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character 4465 *dst++ = *src++; 4466 if (*src) *dst++ = *src++; 4467 end = dst; 4468 } else { // Copy a single-byte character 4469 char c = *src++; 4470 *dst++ = c; 4471 // Space is not a legal ending character 4472 if (c != ' ') end = dst; 4473 } 4474 } 4475 } 4476 4477 *end = '\0'; 4478 4479 // For "z:", add "." to work around a bug in the C runtime library 4480 if (colon == dst - 1) { 4481 path[2] = '.'; 4482 path[3] = '\0'; 4483 } 4484 4485 return path; 4486} 4487 4488// This code is a copy of JDK's sysSetLength 4489// from src/windows/hpi/src/sys_api_md.c 4490 4491int os::ftruncate(int fd, jlong length) { 4492 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4493 long high = (long)(length >> 32); 4494 DWORD ret; 4495 4496 if (h == (HANDLE)(-1)) { 4497 return -1; 4498 } 4499 4500 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 4501 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 4502 return -1; 4503 } 4504 4505 if (::SetEndOfFile(h) == FALSE) { 4506 return -1; 4507 } 4508 4509 return 0; 4510} 4511 4512 4513// This code is a copy of JDK's sysSync 4514// from src/windows/hpi/src/sys_api_md.c 4515// except for the legacy workaround for a bug in Win 98 4516 4517int os::fsync(int fd) { 4518 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 4519 4520 if ((!::FlushFileBuffers(handle)) && 4521 (GetLastError() != ERROR_ACCESS_DENIED)) { 4522 // from winerror.h 4523 return -1; 4524 } 4525 return 0; 4526} 4527 4528static int nonSeekAvailable(int, long *); 4529static int stdinAvailable(int, long *); 4530 4531#define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR) 4532#define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO) 4533 4534// This code is a copy of JDK's sysAvailable 4535// from src/windows/hpi/src/sys_api_md.c 4536 4537int os::available(int fd, jlong *bytes) { 4538 jlong cur, end; 4539 struct _stati64 stbuf64; 4540 4541 if (::_fstati64(fd, &stbuf64) >= 0) { 4542 int mode = stbuf64.st_mode; 4543 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 4544 int ret; 4545 long lpbytes; 4546 if (fd == 0) { 4547 ret = stdinAvailable(fd, &lpbytes); 4548 } else { 4549 ret = nonSeekAvailable(fd, &lpbytes); 4550 } 4551 (*bytes) = (jlong)(lpbytes); 4552 return ret; 4553 } 4554 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 4555 return FALSE; 4556 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 4557 return FALSE; 4558 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 4559 return FALSE; 4560 } 4561 *bytes = end - cur; 4562 return TRUE; 4563 } else { 4564 return FALSE; 4565 } 4566} 4567 4568// This code is a copy of JDK's nonSeekAvailable 4569// from src/windows/hpi/src/sys_api_md.c 4570 4571static int nonSeekAvailable(int fd, long *pbytes) { 4572 // This is used for available on non-seekable devices 4573 // (like both named and anonymous pipes, such as pipes 4574 // connected to an exec'd process). 4575 // Standard Input is a special case. 4576 HANDLE han; 4577 4578 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 4579 return FALSE; 4580 } 4581 4582 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 4583 // PeekNamedPipe fails when at EOF. In that case we 4584 // simply make *pbytes = 0 which is consistent with the 4585 // behavior we get on Solaris when an fd is at EOF. 4586 // The only alternative is to raise an Exception, 4587 // which isn't really warranted. 4588 // 4589 if (::GetLastError() != ERROR_BROKEN_PIPE) { 4590 return FALSE; 4591 } 4592 *pbytes = 0; 4593 } 4594 return TRUE; 4595} 4596 4597#define MAX_INPUT_EVENTS 2000 4598 4599// This code is a copy of JDK's stdinAvailable 4600// from src/windows/hpi/src/sys_api_md.c 4601 4602static int stdinAvailable(int fd, long *pbytes) { 4603 HANDLE han; 4604 DWORD numEventsRead = 0; // Number of events read from buffer 4605 DWORD numEvents = 0; // Number of events in buffer 4606 DWORD i = 0; // Loop index 4607 DWORD curLength = 0; // Position marker 4608 DWORD actualLength = 0; // Number of bytes readable 4609 BOOL error = FALSE; // Error holder 4610 INPUT_RECORD *lpBuffer; // Pointer to records of input events 4611 4612 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4613 return FALSE; 4614 } 4615 4616 // Construct an array of input records in the console buffer 4617 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4618 if (error == 0) { 4619 return nonSeekAvailable(fd, pbytes); 4620 } 4621 4622 // lpBuffer must fit into 64K or else PeekConsoleInput fails 4623 if (numEvents > MAX_INPUT_EVENTS) { 4624 numEvents = MAX_INPUT_EVENTS; 4625 } 4626 4627 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal); 4628 if (lpBuffer == NULL) { 4629 return FALSE; 4630 } 4631 4632 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4633 if (error == 0) { 4634 os::free(lpBuffer, mtInternal); 4635 return FALSE; 4636 } 4637 4638 // Examine input records for the number of bytes available 4639 for (i=0; i<numEvents; i++) { 4640 if (lpBuffer[i].EventType == KEY_EVENT) { 4641 4642 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4643 &(lpBuffer[i].Event); 4644 if (keyRecord->bKeyDown == TRUE) { 4645 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4646 curLength++; 4647 if (*keyPressed == '\r') { 4648 actualLength = curLength; 4649 } 4650 } 4651 } 4652 } 4653 4654 if (lpBuffer != NULL) { 4655 os::free(lpBuffer, mtInternal); 4656 } 4657 4658 *pbytes = (long) actualLength; 4659 return TRUE; 4660} 4661 4662// Map a block of memory. 4663char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4664 char *addr, size_t bytes, bool read_only, 4665 bool allow_exec) { 4666 HANDLE hFile; 4667 char* base; 4668 4669 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4670 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4671 if (hFile == NULL) { 4672 if (PrintMiscellaneous && Verbose) { 4673 DWORD err = GetLastError(); 4674 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err); 4675 } 4676 return NULL; 4677 } 4678 4679 if (allow_exec) { 4680 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4681 // unless it comes from a PE image (which the shared archive is not.) 4682 // Even VirtualProtect refuses to give execute access to mapped memory 4683 // that was not previously executable. 4684 // 4685 // Instead, stick the executable region in anonymous memory. Yuck. 4686 // Penalty is that ~4 pages will not be shareable - in the future 4687 // we might consider DLLizing the shared archive with a proper PE 4688 // header so that mapping executable + sharing is possible. 4689 4690 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4691 PAGE_READWRITE); 4692 if (base == NULL) { 4693 if (PrintMiscellaneous && Verbose) { 4694 DWORD err = GetLastError(); 4695 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 4696 } 4697 CloseHandle(hFile); 4698 return NULL; 4699 } 4700 4701 DWORD bytes_read; 4702 OVERLAPPED overlapped; 4703 overlapped.Offset = (DWORD)file_offset; 4704 overlapped.OffsetHigh = 0; 4705 overlapped.hEvent = NULL; 4706 // ReadFile guarantees that if the return value is true, the requested 4707 // number of bytes were read before returning. 4708 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 4709 if (!res) { 4710 if (PrintMiscellaneous && Verbose) { 4711 DWORD err = GetLastError(); 4712 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 4713 } 4714 release_memory(base, bytes); 4715 CloseHandle(hFile); 4716 return NULL; 4717 } 4718 } else { 4719 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 4720 NULL /* file_name */); 4721 if (hMap == NULL) { 4722 if (PrintMiscellaneous && Verbose) { 4723 DWORD err = GetLastError(); 4724 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err); 4725 } 4726 CloseHandle(hFile); 4727 return NULL; 4728 } 4729 4730 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 4731 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 4732 (DWORD)bytes, addr); 4733 if (base == NULL) { 4734 if (PrintMiscellaneous && Verbose) { 4735 DWORD err = GetLastError(); 4736 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 4737 } 4738 CloseHandle(hMap); 4739 CloseHandle(hFile); 4740 return NULL; 4741 } 4742 4743 if (CloseHandle(hMap) == 0) { 4744 if (PrintMiscellaneous && Verbose) { 4745 DWORD err = GetLastError(); 4746 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 4747 } 4748 CloseHandle(hFile); 4749 return base; 4750 } 4751 } 4752 4753 if (allow_exec) { 4754 DWORD old_protect; 4755 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 4756 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 4757 4758 if (!res) { 4759 if (PrintMiscellaneous && Verbose) { 4760 DWORD err = GetLastError(); 4761 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 4762 } 4763 // Don't consider this a hard error, on IA32 even if the 4764 // VirtualProtect fails, we should still be able to execute 4765 CloseHandle(hFile); 4766 return base; 4767 } 4768 } 4769 4770 if (CloseHandle(hFile) == 0) { 4771 if (PrintMiscellaneous && Verbose) { 4772 DWORD err = GetLastError(); 4773 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 4774 } 4775 return base; 4776 } 4777 4778 return base; 4779} 4780 4781 4782// Remap a block of memory. 4783char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4784 char *addr, size_t bytes, bool read_only, 4785 bool allow_exec) { 4786 // This OS does not allow existing memory maps to be remapped so we 4787 // have to unmap the memory before we remap it. 4788 if (!os::unmap_memory(addr, bytes)) { 4789 return NULL; 4790 } 4791 4792 // There is a very small theoretical window between the unmap_memory() 4793 // call above and the map_memory() call below where a thread in native 4794 // code may be able to access an address that is no longer mapped. 4795 4796 return os::map_memory(fd, file_name, file_offset, addr, bytes, 4797 read_only, allow_exec); 4798} 4799 4800 4801// Unmap a block of memory. 4802// Returns true=success, otherwise false. 4803 4804bool os::pd_unmap_memory(char* addr, size_t bytes) { 4805 BOOL result = UnmapViewOfFile(addr); 4806 if (result == 0) { 4807 if (PrintMiscellaneous && Verbose) { 4808 DWORD err = GetLastError(); 4809 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 4810 } 4811 return false; 4812 } 4813 return true; 4814} 4815 4816void os::pause() { 4817 char filename[MAX_PATH]; 4818 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4819 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4820 } else { 4821 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4822 } 4823 4824 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4825 if (fd != -1) { 4826 struct stat buf; 4827 ::close(fd); 4828 while (::stat(filename, &buf) == 0) { 4829 Sleep(100); 4830 } 4831 } else { 4832 jio_fprintf(stderr, 4833 "Could not open pause file '%s', continuing immediately.\n", filename); 4834 } 4835} 4836 4837os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 4838 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 4839} 4840 4841// See the caveats for this class in os_windows.hpp 4842// Protects the callback call so that raised OS EXCEPTIONS causes a jump back 4843// into this method and returns false. If no OS EXCEPTION was raised, returns 4844// true. 4845// The callback is supposed to provide the method that should be protected. 4846// 4847bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 4848 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); 4849 assert(!WatcherThread::watcher_thread()->has_crash_protection(), 4850 "crash_protection already set?"); 4851 4852 bool success = true; 4853 __try { 4854 WatcherThread::watcher_thread()->set_crash_protection(this); 4855 cb.call(); 4856 } __except(EXCEPTION_EXECUTE_HANDLER) { 4857 // only for protection, nothing to do 4858 success = false; 4859 } 4860 WatcherThread::watcher_thread()->set_crash_protection(NULL); 4861 return success; 4862} 4863 4864// An Event wraps a win32 "CreateEvent" kernel handle. 4865// 4866// We have a number of choices regarding "CreateEvent" win32 handle leakage: 4867// 4868// 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 4869// field, and call CloseHandle() on the win32 event handle. Unpark() would 4870// need to be modified to tolerate finding a NULL (invalid) win32 event handle. 4871// In addition, an unpark() operation might fetch the handle field, but the 4872// event could recycle between the fetch and the SetEvent() operation. 4873// SetEvent() would either fail because the handle was invalid, or inadvertently work, 4874// as the win32 handle value had been recycled. In an ideal world calling SetEvent() 4875// on an stale but recycled handle would be harmless, but in practice this might 4876// confuse other non-Sun code, so it's not a viable approach. 4877// 4878// 2: Once a win32 event handle is associated with an Event, it remains associated 4879// with the Event. The event handle is never closed. This could be construed 4880// as handle leakage, but only up to the maximum # of threads that have been extant 4881// at any one time. This shouldn't be an issue, as windows platforms typically 4882// permit a process to have hundreds of thousands of open handles. 4883// 4884// 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 4885// and release unused handles. 4886// 4887// 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 4888// It's not clear, however, that we wouldn't be trading one type of leak for another. 4889// 4890// 5. Use an RCU-like mechanism (Read-Copy Update). 4891// Or perhaps something similar to Maged Michael's "Hazard pointers". 4892// 4893// We use (2). 4894// 4895// TODO-FIXME: 4896// 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 4897// 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 4898// to recover from (or at least detect) the dreaded Windows 841176 bug. 4899// 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 4900// into a single win32 CreateEvent() handle. 4901// 4902// Assumption: 4903// Only one parker can exist on an event, which is why we allocate 4904// them per-thread. Multiple unparkers can coexist. 4905// 4906// _Event transitions in park() 4907// -1 => -1 : illegal 4908// 1 => 0 : pass - return immediately 4909// 0 => -1 : block; then set _Event to 0 before returning 4910// 4911// _Event transitions in unpark() 4912// 0 => 1 : just return 4913// 1 => 1 : just return 4914// -1 => either 0 or 1; must signal target thread 4915// That is, we can safely transition _Event from -1 to either 4916// 0 or 1. 4917// 4918// _Event serves as a restricted-range semaphore. 4919// -1 : thread is blocked, i.e. there is a waiter 4920// 0 : neutral: thread is running or ready, 4921// could have been signaled after a wait started 4922// 1 : signaled - thread is running or ready 4923// 4924// Another possible encoding of _Event would be with 4925// explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 4926// 4927 4928int os::PlatformEvent::park(jlong Millis) { 4929 // Transitions for _Event: 4930 // -1 => -1 : illegal 4931 // 1 => 0 : pass - return immediately 4932 // 0 => -1 : block; then set _Event to 0 before returning 4933 4934 guarantee(_ParkHandle != NULL , "Invariant"); 4935 guarantee(Millis > 0 , "Invariant"); 4936 4937 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 4938 // the initial park() operation. 4939 // Consider: use atomic decrement instead of CAS-loop 4940 4941 int v; 4942 for (;;) { 4943 v = _Event; 4944 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4945 } 4946 guarantee((v == 0) || (v == 1), "invariant"); 4947 if (v != 0) return OS_OK; 4948 4949 // Do this the hard way by blocking ... 4950 // TODO: consider a brief spin here, gated on the success of recent 4951 // spin attempts by this thread. 4952 // 4953 // We decompose long timeouts into series of shorter timed waits. 4954 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 4955 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 4956 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 4957 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 4958 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 4959 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 4960 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 4961 // for the already waited time. This policy does not admit any new outcomes. 4962 // In the future, however, we might want to track the accumulated wait time and 4963 // adjust Millis accordingly if we encounter a spurious wakeup. 4964 4965 const int MAXTIMEOUT = 0x10000000; 4966 DWORD rv = WAIT_TIMEOUT; 4967 while (_Event < 0 && Millis > 0) { 4968 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT) 4969 if (Millis > MAXTIMEOUT) { 4970 prd = MAXTIMEOUT; 4971 } 4972 rv = ::WaitForSingleObject(_ParkHandle, prd); 4973 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed"); 4974 if (rv == WAIT_TIMEOUT) { 4975 Millis -= prd; 4976 } 4977 } 4978 v = _Event; 4979 _Event = 0; 4980 // see comment at end of os::PlatformEvent::park() below: 4981 OrderAccess::fence(); 4982 // If we encounter a nearly simultanous timeout expiry and unpark() 4983 // we return OS_OK indicating we awoke via unpark(). 4984 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 4985 return (v >= 0) ? OS_OK : OS_TIMEOUT; 4986} 4987 4988void os::PlatformEvent::park() { 4989 // Transitions for _Event: 4990 // -1 => -1 : illegal 4991 // 1 => 0 : pass - return immediately 4992 // 0 => -1 : block; then set _Event to 0 before returning 4993 4994 guarantee(_ParkHandle != NULL, "Invariant"); 4995 // Invariant: Only the thread associated with the Event/PlatformEvent 4996 // may call park(). 4997 // Consider: use atomic decrement instead of CAS-loop 4998 int v; 4999 for (;;) { 5000 v = _Event; 5001 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5002 } 5003 guarantee((v == 0) || (v == 1), "invariant"); 5004 if (v != 0) return; 5005 5006 // Do this the hard way by blocking ... 5007 // TODO: consider a brief spin here, gated on the success of recent 5008 // spin attempts by this thread. 5009 while (_Event < 0) { 5010 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE); 5011 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed"); 5012 } 5013 5014 // Usually we'll find _Event == 0 at this point, but as 5015 // an optional optimization we clear it, just in case can 5016 // multiple unpark() operations drove _Event up to 1. 5017 _Event = 0; 5018 OrderAccess::fence(); 5019 guarantee(_Event >= 0, "invariant"); 5020} 5021 5022void os::PlatformEvent::unpark() { 5023 guarantee(_ParkHandle != NULL, "Invariant"); 5024 5025 // Transitions for _Event: 5026 // 0 => 1 : just return 5027 // 1 => 1 : just return 5028 // -1 => either 0 or 1; must signal target thread 5029 // That is, we can safely transition _Event from -1 to either 5030 // 0 or 1. 5031 // See also: "Semaphores in Plan 9" by Mullender & Cox 5032 // 5033 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5034 // that it will take two back-to-back park() calls for the owning 5035 // thread to block. This has the benefit of forcing a spurious return 5036 // from the first park() call after an unpark() call which will help 5037 // shake out uses of park() and unpark() without condition variables. 5038 5039 if (Atomic::xchg(1, &_Event) >= 0) return; 5040 5041 ::SetEvent(_ParkHandle); 5042} 5043 5044 5045// JSR166 5046// ------------------------------------------------------- 5047 5048// The Windows implementation of Park is very straightforward: Basic 5049// operations on Win32 Events turn out to have the right semantics to 5050// use them directly. We opportunistically resuse the event inherited 5051// from Monitor. 5052 5053void Parker::park(bool isAbsolute, jlong time) { 5054 guarantee(_ParkEvent != NULL, "invariant"); 5055 // First, demultiplex/decode time arguments 5056 if (time < 0) { // don't wait 5057 return; 5058 } else if (time == 0 && !isAbsolute) { 5059 time = INFINITE; 5060 } else if (isAbsolute) { 5061 time -= os::javaTimeMillis(); // convert to relative time 5062 if (time <= 0) { // already elapsed 5063 return; 5064 } 5065 } else { // relative 5066 time /= 1000000; // Must coarsen from nanos to millis 5067 if (time == 0) { // Wait for the minimal time unit if zero 5068 time = 1; 5069 } 5070 } 5071 5072 JavaThread* thread = (JavaThread*)(Thread::current()); 5073 assert(thread->is_Java_thread(), "Must be JavaThread"); 5074 JavaThread *jt = (JavaThread *)thread; 5075 5076 // Don't wait if interrupted or already triggered 5077 if (Thread::is_interrupted(thread, false) || 5078 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 5079 ResetEvent(_ParkEvent); 5080 return; 5081 } else { 5082 ThreadBlockInVM tbivm(jt); 5083 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5084 jt->set_suspend_equivalent(); 5085 5086 WaitForSingleObject(_ParkEvent, time); 5087 ResetEvent(_ParkEvent); 5088 5089 // If externally suspended while waiting, re-suspend 5090 if (jt->handle_special_suspend_equivalent_condition()) { 5091 jt->java_suspend_self(); 5092 } 5093 } 5094} 5095 5096void Parker::unpark() { 5097 guarantee(_ParkEvent != NULL, "invariant"); 5098 SetEvent(_ParkEvent); 5099} 5100 5101// Run the specified command in a separate process. Return its exit value, 5102// or -1 on failure (e.g. can't create a new process). 5103int os::fork_and_exec(char* cmd) { 5104 STARTUPINFO si; 5105 PROCESS_INFORMATION pi; 5106 5107 memset(&si, 0, sizeof(si)); 5108 si.cb = sizeof(si); 5109 memset(&pi, 0, sizeof(pi)); 5110 BOOL rslt = CreateProcess(NULL, // executable name - use command line 5111 cmd, // command line 5112 NULL, // process security attribute 5113 NULL, // thread security attribute 5114 TRUE, // inherits system handles 5115 0, // no creation flags 5116 NULL, // use parent's environment block 5117 NULL, // use parent's starting directory 5118 &si, // (in) startup information 5119 &pi); // (out) process information 5120 5121 if (rslt) { 5122 // Wait until child process exits. 5123 WaitForSingleObject(pi.hProcess, INFINITE); 5124 5125 DWORD exit_code; 5126 GetExitCodeProcess(pi.hProcess, &exit_code); 5127 5128 // Close process and thread handles. 5129 CloseHandle(pi.hProcess); 5130 CloseHandle(pi.hThread); 5131 5132 return (int)exit_code; 5133 } else { 5134 return -1; 5135 } 5136} 5137 5138//-------------------------------------------------------------------------------------------------- 5139// Non-product code 5140 5141static int mallocDebugIntervalCounter = 0; 5142static int mallocDebugCounter = 0; 5143bool os::check_heap(bool force) { 5144 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 5145 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 5146 // Note: HeapValidate executes two hardware breakpoints when it finds something 5147 // wrong; at these points, eax contains the address of the offending block (I think). 5148 // To get to the exlicit error message(s) below, just continue twice. 5149 HANDLE heap = GetProcessHeap(); 5150 5151 // If we fail to lock the heap, then gflags.exe has been used 5152 // or some other special heap flag has been set that prevents 5153 // locking. We don't try to walk a heap we can't lock. 5154 if (HeapLock(heap) != 0) { 5155 PROCESS_HEAP_ENTRY phe; 5156 phe.lpData = NULL; 5157 while (HeapWalk(heap, &phe) != 0) { 5158 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 5159 !HeapValidate(heap, 0, phe.lpData)) { 5160 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 5161 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 5162 fatal("corrupted C heap"); 5163 } 5164 } 5165 DWORD err = GetLastError(); 5166 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 5167 fatal(err_msg("heap walk aborted with error %d", err)); 5168 } 5169 HeapUnlock(heap); 5170 } 5171 mallocDebugIntervalCounter = 0; 5172 } 5173 return true; 5174} 5175 5176 5177bool os::find(address addr, outputStream* st) { 5178 // Nothing yet 5179 return false; 5180} 5181 5182LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 5183 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 5184 5185 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 5186 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow(); 5187 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 5188 address addr = (address) exceptionRecord->ExceptionInformation[1]; 5189 5190 if (os::is_memory_serialize_page(thread, addr)) { 5191 return EXCEPTION_CONTINUE_EXECUTION; 5192 } 5193 } 5194 5195 return EXCEPTION_CONTINUE_SEARCH; 5196} 5197 5198// We don't build a headless jre for Windows 5199bool os::is_headless_jre() { return false; } 5200 5201static jint initSock() { 5202 WSADATA wsadata; 5203 5204 if (!os::WinSock2Dll::WinSock2Available()) { 5205 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n", 5206 ::GetLastError()); 5207 return JNI_ERR; 5208 } 5209 5210 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) { 5211 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n", 5212 ::GetLastError()); 5213 return JNI_ERR; 5214 } 5215 return JNI_OK; 5216} 5217 5218struct hostent* os::get_host_by_name(char* name) { 5219 return (struct hostent*)os::WinSock2Dll::gethostbyname(name); 5220} 5221 5222int os::socket_close(int fd) { 5223 return ::closesocket(fd); 5224} 5225 5226int os::socket(int domain, int type, int protocol) { 5227 return ::socket(domain, type, protocol); 5228} 5229 5230int os::connect(int fd, struct sockaddr* him, socklen_t len) { 5231 return ::connect(fd, him, len); 5232} 5233 5234int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5235 return ::recv(fd, buf, (int)nBytes, flags); 5236} 5237 5238int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5239 return ::send(fd, buf, (int)nBytes, flags); 5240} 5241 5242int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5243 return ::send(fd, buf, (int)nBytes, flags); 5244} 5245 5246// WINDOWS CONTEXT Flags for THREAD_SAMPLING 5247#if defined(IA32) 5248 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS) 5249#elif defined (AMD64) 5250 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT) 5251#endif 5252 5253// returns true if thread could be suspended, 5254// false otherwise 5255static bool do_suspend(HANDLE* h) { 5256 if (h != NULL) { 5257 if (SuspendThread(*h) != ~0) { 5258 return true; 5259 } 5260 } 5261 return false; 5262} 5263 5264// resume the thread 5265// calling resume on an active thread is a no-op 5266static void do_resume(HANDLE* h) { 5267 if (h != NULL) { 5268 ResumeThread(*h); 5269 } 5270} 5271 5272// retrieve a suspend/resume context capable handle 5273// from the tid. Caller validates handle return value. 5274void get_thread_handle_for_extended_context(HANDLE* h, 5275 OSThread::thread_id_t tid) { 5276 if (h != NULL) { 5277 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid); 5278 } 5279} 5280 5281// Thread sampling implementation 5282// 5283void os::SuspendedThreadTask::internal_do_task() { 5284 CONTEXT ctxt; 5285 HANDLE h = NULL; 5286 5287 // get context capable handle for thread 5288 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id()); 5289 5290 // sanity 5291 if (h == NULL || h == INVALID_HANDLE_VALUE) { 5292 return; 5293 } 5294 5295 // suspend the thread 5296 if (do_suspend(&h)) { 5297 ctxt.ContextFlags = sampling_context_flags; 5298 // get thread context 5299 GetThreadContext(h, &ctxt); 5300 SuspendedThreadTaskContext context(_thread, &ctxt); 5301 // pass context to Thread Sampling impl 5302 do_task(context); 5303 // resume thread 5304 do_resume(&h); 5305 } 5306 5307 // close handle 5308 CloseHandle(h); 5309} 5310 5311 5312// Kernel32 API 5313typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void); 5314typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD); 5315typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG); 5316typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG); 5317typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG); 5318 5319GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL; 5320VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL; 5321GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL; 5322GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL; 5323RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL; 5324 5325 5326BOOL os::Kernel32Dll::initialized = FALSE; 5327SIZE_T os::Kernel32Dll::GetLargePageMinimum() { 5328 assert(initialized && _GetLargePageMinimum != NULL, 5329 "GetLargePageMinimumAvailable() not yet called"); 5330 return _GetLargePageMinimum(); 5331} 5332 5333BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() { 5334 if (!initialized) { 5335 initialize(); 5336 } 5337 return _GetLargePageMinimum != NULL; 5338} 5339 5340BOOL os::Kernel32Dll::NumaCallsAvailable() { 5341 if (!initialized) { 5342 initialize(); 5343 } 5344 return _VirtualAllocExNuma != NULL; 5345} 5346 5347LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, 5348 SIZE_T bytes, DWORD flags, 5349 DWORD prot, DWORD node) { 5350 assert(initialized && _VirtualAllocExNuma != NULL, 5351 "NUMACallsAvailable() not yet called"); 5352 5353 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node); 5354} 5355 5356BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) { 5357 assert(initialized && _GetNumaHighestNodeNumber != NULL, 5358 "NUMACallsAvailable() not yet called"); 5359 5360 return _GetNumaHighestNodeNumber(ptr_highest_node_number); 5361} 5362 5363BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, 5364 PULONGLONG proc_mask) { 5365 assert(initialized && _GetNumaNodeProcessorMask != NULL, 5366 "NUMACallsAvailable() not yet called"); 5367 5368 return _GetNumaNodeProcessorMask(node, proc_mask); 5369} 5370 5371USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip, 5372 ULONG FrameToCapture, 5373 PVOID* BackTrace, 5374 PULONG BackTraceHash) { 5375 if (!initialized) { 5376 initialize(); 5377 } 5378 5379 if (_RtlCaptureStackBackTrace != NULL) { 5380 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture, 5381 BackTrace, BackTraceHash); 5382 } else { 5383 return 0; 5384 } 5385} 5386 5387void os::Kernel32Dll::initializeCommon() { 5388 if (!initialized) { 5389 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5390 assert(handle != NULL, "Just check"); 5391 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum"); 5392 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma"); 5393 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber"); 5394 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask"); 5395 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace"); 5396 initialized = TRUE; 5397 } 5398} 5399 5400 5401 5402#ifndef JDK6_OR_EARLIER 5403 5404void os::Kernel32Dll::initialize() { 5405 initializeCommon(); 5406} 5407 5408 5409// Kernel32 API 5410inline BOOL os::Kernel32Dll::SwitchToThread() { 5411 return ::SwitchToThread(); 5412} 5413 5414inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5415 return true; 5416} 5417 5418// Help tools 5419inline BOOL os::Kernel32Dll::HelpToolsAvailable() { 5420 return true; 5421} 5422 5423inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5424 DWORD th32ProcessId) { 5425 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5426} 5427 5428inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot, 5429 LPMODULEENTRY32 lpme) { 5430 return ::Module32First(hSnapshot, lpme); 5431} 5432 5433inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5434 LPMODULEENTRY32 lpme) { 5435 return ::Module32Next(hSnapshot, lpme); 5436} 5437 5438inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5439 ::GetNativeSystemInfo(lpSystemInfo); 5440} 5441 5442// PSAPI API 5443inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, 5444 HMODULE *lpModule, DWORD cb, 5445 LPDWORD lpcbNeeded) { 5446 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5447} 5448 5449inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, 5450 HMODULE hModule, 5451 LPTSTR lpFilename, 5452 DWORD nSize) { 5453 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5454} 5455 5456inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, 5457 HMODULE hModule, 5458 LPMODULEINFO lpmodinfo, 5459 DWORD cb) { 5460 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5461} 5462 5463inline BOOL os::PSApiDll::PSApiAvailable() { 5464 return true; 5465} 5466 5467 5468// WinSock2 API 5469inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, 5470 LPWSADATA lpWSAData) { 5471 return ::WSAStartup(wVersionRequested, lpWSAData); 5472} 5473 5474inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5475 return ::gethostbyname(name); 5476} 5477 5478inline BOOL os::WinSock2Dll::WinSock2Available() { 5479 return true; 5480} 5481 5482// Advapi API 5483inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5484 BOOL DisableAllPrivileges, 5485 PTOKEN_PRIVILEGES NewState, 5486 DWORD BufferLength, 5487 PTOKEN_PRIVILEGES PreviousState, 5488 PDWORD ReturnLength) { 5489 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5490 BufferLength, PreviousState, ReturnLength); 5491} 5492 5493inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5494 DWORD DesiredAccess, 5495 PHANDLE TokenHandle) { 5496 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5497} 5498 5499inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5500 LPCTSTR lpName, 5501 PLUID lpLuid) { 5502 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5503} 5504 5505inline BOOL os::Advapi32Dll::AdvapiAvailable() { 5506 return true; 5507} 5508 5509void* os::get_default_process_handle() { 5510 return (void*)GetModuleHandle(NULL); 5511} 5512 5513// Builds a platform dependent Agent_OnLoad_<lib_name> function name 5514// which is used to find statically linked in agents. 5515// Additionally for windows, takes into account __stdcall names. 5516// Parameters: 5517// sym_name: Symbol in library we are looking for 5518// lib_name: Name of library to look in, NULL for shared libs. 5519// is_absolute_path == true if lib_name is absolute path to agent 5520// such as "C:/a/b/L.dll" 5521// == false if only the base name of the library is passed in 5522// such as "L" 5523char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 5524 bool is_absolute_path) { 5525 char *agent_entry_name; 5526 size_t len; 5527 size_t name_len; 5528 size_t prefix_len = strlen(JNI_LIB_PREFIX); 5529 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 5530 const char *start; 5531 5532 if (lib_name != NULL) { 5533 len = name_len = strlen(lib_name); 5534 if (is_absolute_path) { 5535 // Need to strip path, prefix and suffix 5536 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 5537 lib_name = ++start; 5538 } else { 5539 // Need to check for drive prefix 5540 if ((start = strchr(lib_name, ':')) != NULL) { 5541 lib_name = ++start; 5542 } 5543 } 5544 if (len <= (prefix_len + suffix_len)) { 5545 return NULL; 5546 } 5547 lib_name += prefix_len; 5548 name_len = strlen(lib_name) - suffix_len; 5549 } 5550 } 5551 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 5552 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 5553 if (agent_entry_name == NULL) { 5554 return NULL; 5555 } 5556 if (lib_name != NULL) { 5557 const char *p = strrchr(sym_name, '@'); 5558 if (p != NULL && p != sym_name) { 5559 // sym_name == _Agent_OnLoad@XX 5560 strncpy(agent_entry_name, sym_name, (p - sym_name)); 5561 agent_entry_name[(p-sym_name)] = '\0'; 5562 // agent_entry_name == _Agent_OnLoad 5563 strcat(agent_entry_name, "_"); 5564 strncat(agent_entry_name, lib_name, name_len); 5565 strcat(agent_entry_name, p); 5566 // agent_entry_name == _Agent_OnLoad_lib_name@XX 5567 } else { 5568 strcpy(agent_entry_name, sym_name); 5569 strcat(agent_entry_name, "_"); 5570 strncat(agent_entry_name, lib_name, name_len); 5571 } 5572 } else { 5573 strcpy(agent_entry_name, sym_name); 5574 } 5575 return agent_entry_name; 5576} 5577 5578#else 5579// Kernel32 API 5580typedef BOOL (WINAPI* SwitchToThread_Fn)(void); 5581typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD); 5582typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32); 5583typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32); 5584typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO); 5585 5586SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL; 5587CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL; 5588Module32First_Fn os::Kernel32Dll::_Module32First = NULL; 5589Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL; 5590GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL; 5591 5592void os::Kernel32Dll::initialize() { 5593 if (!initialized) { 5594 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5595 assert(handle != NULL, "Just check"); 5596 5597 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread"); 5598 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn) 5599 ::GetProcAddress(handle, "CreateToolhelp32Snapshot"); 5600 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First"); 5601 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next"); 5602 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo"); 5603 initializeCommon(); // resolve the functions that always need resolving 5604 5605 initialized = TRUE; 5606 } 5607} 5608 5609BOOL os::Kernel32Dll::SwitchToThread() { 5610 assert(initialized && _SwitchToThread != NULL, 5611 "SwitchToThreadAvailable() not yet called"); 5612 return _SwitchToThread(); 5613} 5614 5615 5616BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5617 if (!initialized) { 5618 initialize(); 5619 } 5620 return _SwitchToThread != NULL; 5621} 5622 5623// Help tools 5624BOOL os::Kernel32Dll::HelpToolsAvailable() { 5625 if (!initialized) { 5626 initialize(); 5627 } 5628 return _CreateToolhelp32Snapshot != NULL && 5629 _Module32First != NULL && 5630 _Module32Next != NULL; 5631} 5632 5633HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5634 DWORD th32ProcessId) { 5635 assert(initialized && _CreateToolhelp32Snapshot != NULL, 5636 "HelpToolsAvailable() not yet called"); 5637 5638 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5639} 5640 5641BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5642 assert(initialized && _Module32First != NULL, 5643 "HelpToolsAvailable() not yet called"); 5644 5645 return _Module32First(hSnapshot, lpme); 5646} 5647 5648inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5649 LPMODULEENTRY32 lpme) { 5650 assert(initialized && _Module32Next != NULL, 5651 "HelpToolsAvailable() not yet called"); 5652 5653 return _Module32Next(hSnapshot, lpme); 5654} 5655 5656 5657BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() { 5658 if (!initialized) { 5659 initialize(); 5660 } 5661 return _GetNativeSystemInfo != NULL; 5662} 5663 5664void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5665 assert(initialized && _GetNativeSystemInfo != NULL, 5666 "GetNativeSystemInfoAvailable() not yet called"); 5667 5668 _GetNativeSystemInfo(lpSystemInfo); 5669} 5670 5671// PSAPI API 5672 5673 5674typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD); 5675typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD); 5676typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD); 5677 5678EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL; 5679GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL; 5680GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL; 5681BOOL os::PSApiDll::initialized = FALSE; 5682 5683void os::PSApiDll::initialize() { 5684 if (!initialized) { 5685 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0); 5686 if (handle != NULL) { 5687 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle, 5688 "EnumProcessModules"); 5689 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle, 5690 "GetModuleFileNameExA"); 5691 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle, 5692 "GetModuleInformation"); 5693 } 5694 initialized = TRUE; 5695 } 5696} 5697 5698 5699 5700BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, 5701 DWORD cb, LPDWORD lpcbNeeded) { 5702 assert(initialized && _EnumProcessModules != NULL, 5703 "PSApiAvailable() not yet called"); 5704 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5705} 5706 5707DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, 5708 LPTSTR lpFilename, DWORD nSize) { 5709 assert(initialized && _GetModuleFileNameEx != NULL, 5710 "PSApiAvailable() not yet called"); 5711 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5712} 5713 5714BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, 5715 LPMODULEINFO lpmodinfo, DWORD cb) { 5716 assert(initialized && _GetModuleInformation != NULL, 5717 "PSApiAvailable() not yet called"); 5718 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5719} 5720 5721BOOL os::PSApiDll::PSApiAvailable() { 5722 if (!initialized) { 5723 initialize(); 5724 } 5725 return _EnumProcessModules != NULL && 5726 _GetModuleFileNameEx != NULL && 5727 _GetModuleInformation != NULL; 5728} 5729 5730 5731// WinSock2 API 5732typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA); 5733typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...); 5734 5735WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL; 5736gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL; 5737BOOL os::WinSock2Dll::initialized = FALSE; 5738 5739void os::WinSock2Dll::initialize() { 5740 if (!initialized) { 5741 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0); 5742 if (handle != NULL) { 5743 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup"); 5744 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname"); 5745 } 5746 initialized = TRUE; 5747 } 5748} 5749 5750 5751BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) { 5752 assert(initialized && _WSAStartup != NULL, 5753 "WinSock2Available() not yet called"); 5754 return _WSAStartup(wVersionRequested, lpWSAData); 5755} 5756 5757struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5758 assert(initialized && _gethostbyname != NULL, 5759 "WinSock2Available() not yet called"); 5760 return _gethostbyname(name); 5761} 5762 5763BOOL os::WinSock2Dll::WinSock2Available() { 5764 if (!initialized) { 5765 initialize(); 5766 } 5767 return _WSAStartup != NULL && 5768 _gethostbyname != NULL; 5769} 5770 5771typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 5772typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE); 5773typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID); 5774 5775AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL; 5776OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL; 5777LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL; 5778BOOL os::Advapi32Dll::initialized = FALSE; 5779 5780void os::Advapi32Dll::initialize() { 5781 if (!initialized) { 5782 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0); 5783 if (handle != NULL) { 5784 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle, 5785 "AdjustTokenPrivileges"); 5786 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle, 5787 "OpenProcessToken"); 5788 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle, 5789 "LookupPrivilegeValueA"); 5790 } 5791 initialized = TRUE; 5792 } 5793} 5794 5795BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5796 BOOL DisableAllPrivileges, 5797 PTOKEN_PRIVILEGES NewState, 5798 DWORD BufferLength, 5799 PTOKEN_PRIVILEGES PreviousState, 5800 PDWORD ReturnLength) { 5801 assert(initialized && _AdjustTokenPrivileges != NULL, 5802 "AdvapiAvailable() not yet called"); 5803 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5804 BufferLength, PreviousState, ReturnLength); 5805} 5806 5807BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5808 DWORD DesiredAccess, 5809 PHANDLE TokenHandle) { 5810 assert(initialized && _OpenProcessToken != NULL, 5811 "AdvapiAvailable() not yet called"); 5812 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5813} 5814 5815BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5816 LPCTSTR lpName, PLUID lpLuid) { 5817 assert(initialized && _LookupPrivilegeValue != NULL, 5818 "AdvapiAvailable() not yet called"); 5819 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5820} 5821 5822BOOL os::Advapi32Dll::AdvapiAvailable() { 5823 if (!initialized) { 5824 initialize(); 5825 } 5826 return _AdjustTokenPrivileges != NULL && 5827 _OpenProcessToken != NULL && 5828 _LookupPrivilegeValue != NULL; 5829} 5830 5831#endif 5832 5833#ifndef PRODUCT 5834 5835// test the code path in reserve_memory_special() that tries to allocate memory in a single 5836// contiguous memory block at a particular address. 5837// The test first tries to find a good approximate address to allocate at by using the same 5838// method to allocate some memory at any address. The test then tries to allocate memory in 5839// the vicinity (not directly after it to avoid possible by-chance use of that location) 5840// This is of course only some dodgy assumption, there is no guarantee that the vicinity of 5841// the previously allocated memory is available for allocation. The only actual failure 5842// that is reported is when the test tries to allocate at a particular location but gets a 5843// different valid one. A NULL return value at this point is not considered an error but may 5844// be legitimate. 5845// If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages. 5846void TestReserveMemorySpecial_test() { 5847 if (!UseLargePages) { 5848 if (VerboseInternalVMTests) { 5849 gclog_or_tty->print("Skipping test because large pages are disabled"); 5850 } 5851 return; 5852 } 5853 // save current value of globals 5854 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; 5855 bool old_use_numa_interleaving = UseNUMAInterleaving; 5856 5857 // set globals to make sure we hit the correct code path 5858 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; 5859 5860 // do an allocation at an address selected by the OS to get a good one. 5861 const size_t large_allocation_size = os::large_page_size() * 4; 5862 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); 5863 if (result == NULL) { 5864 if (VerboseInternalVMTests) { 5865 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.", 5866 large_allocation_size); 5867 } 5868 } else { 5869 os::release_memory_special(result, large_allocation_size); 5870 5871 // allocate another page within the recently allocated memory area which seems to be a good location. At least 5872 // we managed to get it once. 5873 const size_t expected_allocation_size = os::large_page_size(); 5874 char* expected_location = result + os::large_page_size(); 5875 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); 5876 if (actual_location == NULL) { 5877 if (VerboseInternalVMTests) { 5878 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.", 5879 expected_location, large_allocation_size); 5880 } 5881 } else { 5882 // release memory 5883 os::release_memory_special(actual_location, expected_allocation_size); 5884 // only now check, after releasing any memory to avoid any leaks. 5885 assert(actual_location == expected_location, 5886 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead", 5887 expected_location, expected_allocation_size, actual_location)); 5888 } 5889 } 5890 5891 // restore globals 5892 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; 5893 UseNUMAInterleaving = old_use_numa_interleaving; 5894} 5895#endif // PRODUCT 5896 5897