os_windows.cpp revision 13234:28e384fe79fd
1/* 2 * Copyright (c) 1997, 2017, 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 "logging/log.hpp" 39#include "memory/allocation.inline.hpp" 40#include "memory/filemap.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.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 "semaphore_windows.hpp" 67#include "services/attachListener.hpp" 68#include "services/memTracker.hpp" 69#include "services/runtimeService.hpp" 70#include "utilities/decoder.hpp" 71#include "utilities/defaultStream.hpp" 72#include "utilities/events.hpp" 73#include "utilities/growableArray.hpp" 74#include "utilities/macros.hpp" 75#include "utilities/vmError.hpp" 76 77#ifdef _DEBUG 78#include <crtdbg.h> 79#endif 80 81 82#include <windows.h> 83#include <sys/types.h> 84#include <sys/stat.h> 85#include <sys/timeb.h> 86#include <objidl.h> 87#include <shlobj.h> 88 89#include <malloc.h> 90#include <signal.h> 91#include <direct.h> 92#include <errno.h> 93#include <fcntl.h> 94#include <io.h> 95#include <process.h> // For _beginthreadex(), _endthreadex() 96#include <imagehlp.h> // For os::dll_address_to_function_name 97// for enumerating dll libraries 98#include <vdmdbg.h> 99 100// for timer info max values which include all bits 101#define ALL_64_BITS CONST64(-1) 102 103// For DLL loading/load error detection 104// Values of PE COFF 105#define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c 106#define IMAGE_FILE_SIGNATURE_LENGTH 4 107 108static HANDLE main_process; 109static HANDLE main_thread; 110static int main_thread_id; 111 112static FILETIME process_creation_time; 113static FILETIME process_exit_time; 114static FILETIME process_user_time; 115static FILETIME process_kernel_time; 116 117#ifdef _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::unsetenv(const char* name) { 157 assert(name != NULL, "Null pointer"); 158 return (SetEnvironmentVariable(name, NULL) == TRUE); 159} 160 161// No setuid programs under Windows. 162bool os::have_special_privileges() { 163 return false; 164} 165 166 167// This method is a periodic task to check for misbehaving JNI applications 168// under CheckJNI, we can add any periodic checks here. 169// For Windows at the moment does nothing 170void os::run_periodic_checks() { 171 return; 172} 173 174// previous UnhandledExceptionFilter, if there is one 175static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL; 176 177LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 178 179void os::init_system_properties_values() { 180 // sysclasspath, java_home, dll_dir 181 { 182 char *home_path; 183 char *dll_path; 184 char *pslash; 185 char *bin = "\\bin"; 186 char home_dir[MAX_PATH + 1]; 187 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR"); 188 189 if (alt_home_dir != NULL) { 190 strncpy(home_dir, alt_home_dir, MAX_PATH + 1); 191 home_dir[MAX_PATH] = '\0'; 192 } else { 193 os::jvm_path(home_dir, sizeof(home_dir)); 194 // Found the full path to jvm.dll. 195 // Now cut the path to <java_home>/jre if we can. 196 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll 197 pslash = strrchr(home_dir, '\\'); 198 if (pslash != NULL) { 199 *pslash = '\0'; // get rid of \{client|server} 200 pslash = strrchr(home_dir, '\\'); 201 if (pslash != NULL) { 202 *pslash = '\0'; // get rid of \bin 203 } 204 } 205 } 206 207 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal); 208 if (home_path == NULL) { 209 return; 210 } 211 strcpy(home_path, home_dir); 212 Arguments::set_java_home(home_path); 213 FREE_C_HEAP_ARRAY(char, home_path); 214 215 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, 216 mtInternal); 217 if (dll_path == NULL) { 218 return; 219 } 220 strcpy(dll_path, home_dir); 221 strcat(dll_path, bin); 222 Arguments::set_dll_dir(dll_path); 223 FREE_C_HEAP_ARRAY(char, dll_path); 224 225 if (!set_boot_path('\\', ';')) { 226 return; 227 } 228 } 229 230// library_path 231#define EXT_DIR "\\lib\\ext" 232#define BIN_DIR "\\bin" 233#define PACKAGE_DIR "\\Sun\\Java" 234 { 235 // Win32 library search order (See the documentation for LoadLibrary): 236 // 237 // 1. The directory from which application is loaded. 238 // 2. The system wide Java Extensions directory (Java only) 239 // 3. System directory (GetSystemDirectory) 240 // 4. Windows directory (GetWindowsDirectory) 241 // 5. The PATH environment variable 242 // 6. The current directory 243 244 char *library_path; 245 char tmp[MAX_PATH]; 246 char *path_str = ::getenv("PATH"); 247 248 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 249 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal); 250 251 library_path[0] = '\0'; 252 253 GetModuleFileName(NULL, tmp, sizeof(tmp)); 254 *(strrchr(tmp, '\\')) = '\0'; 255 strcat(library_path, tmp); 256 257 GetWindowsDirectory(tmp, sizeof(tmp)); 258 strcat(library_path, ";"); 259 strcat(library_path, tmp); 260 strcat(library_path, PACKAGE_DIR BIN_DIR); 261 262 GetSystemDirectory(tmp, sizeof(tmp)); 263 strcat(library_path, ";"); 264 strcat(library_path, tmp); 265 266 GetWindowsDirectory(tmp, sizeof(tmp)); 267 strcat(library_path, ";"); 268 strcat(library_path, tmp); 269 270 if (path_str) { 271 strcat(library_path, ";"); 272 strcat(library_path, path_str); 273 } 274 275 strcat(library_path, ";."); 276 277 Arguments::set_library_path(library_path); 278 FREE_C_HEAP_ARRAY(char, library_path); 279 } 280 281 // Default extensions directory 282 { 283 char path[MAX_PATH]; 284 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 285 GetWindowsDirectory(path, MAX_PATH); 286 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 287 path, PACKAGE_DIR, EXT_DIR); 288 Arguments::set_ext_dirs(buf); 289 } 290 #undef EXT_DIR 291 #undef BIN_DIR 292 #undef PACKAGE_DIR 293 294#ifndef _WIN64 295 // set our UnhandledExceptionFilter and save any previous one 296 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception); 297#endif 298 299 // Done 300 return; 301} 302 303void os::breakpoint() { 304 DebugBreak(); 305} 306 307// Invoked from the BREAKPOINT Macro 308extern "C" void breakpoint() { 309 os::breakpoint(); 310} 311 312// RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP. 313// So far, this method is only used by Native Memory Tracking, which is 314// only supported on Windows XP or later. 315// 316int os::get_native_stack(address* stack, int frames, int toSkip) { 317 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL); 318 for (int index = captured; index < frames; index ++) { 319 stack[index] = NULL; 320 } 321 return captured; 322} 323 324 325// os::current_stack_base() 326// 327// Returns the base of the stack, which is the stack's 328// starting address. This function must be called 329// while running on the stack of the thread being queried. 330 331address os::current_stack_base() { 332 MEMORY_BASIC_INFORMATION minfo; 333 address stack_bottom; 334 size_t stack_size; 335 336 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 337 stack_bottom = (address)minfo.AllocationBase; 338 stack_size = minfo.RegionSize; 339 340 // Add up the sizes of all the regions with the same 341 // AllocationBase. 342 while (1) { 343 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 344 if (stack_bottom == (address)minfo.AllocationBase) { 345 stack_size += minfo.RegionSize; 346 } else { 347 break; 348 } 349 } 350 return stack_bottom + stack_size; 351} 352 353size_t os::current_stack_size() { 354 size_t sz; 355 MEMORY_BASIC_INFORMATION minfo; 356 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 357 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 358 return sz; 359} 360 361struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 362 const struct tm* time_struct_ptr = localtime(clock); 363 if (time_struct_ptr != NULL) { 364 *res = *time_struct_ptr; 365 return res; 366 } 367 return NULL; 368} 369 370struct tm* os::gmtime_pd(const time_t* clock, struct tm* res) { 371 const struct tm* time_struct_ptr = gmtime(clock); 372 if (time_struct_ptr != NULL) { 373 *res = *time_struct_ptr; 374 return res; 375 } 376 return NULL; 377} 378 379LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 380 381// Thread start routine for all newly created threads 382static unsigned __stdcall thread_native_entry(Thread* thread) { 383 // Try to randomize the cache line index of hot stack frames. 384 // This helps when threads of the same stack traces evict each other's 385 // cache lines. The threads can be either from the same JVM instance, or 386 // from different JVM instances. The benefit is especially true for 387 // processors with hyperthreading technology. 388 static int counter = 0; 389 int pid = os::current_process_id(); 390 _alloca(((pid ^ counter++) & 7) * 128); 391 392 thread->initialize_thread_current(); 393 394 OSThread* osthr = thread->osthread(); 395 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 396 397 if (UseNUMA) { 398 int lgrp_id = os::numa_get_group_id(); 399 if (lgrp_id != -1) { 400 thread->set_lgrp_id(lgrp_id); 401 } 402 } 403 404 // Diagnostic code to investigate JDK-6573254 405 int res = 30115; // non-java thread 406 if (thread->is_Java_thread()) { 407 res = 20115; // java thread 408 } 409 410 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id()); 411 412 // Install a win32 structured exception handler around every thread created 413 // by VM, so VM can generate error dump when an exception occurred in non- 414 // Java thread (e.g. VM thread). 415 __try { 416 thread->run(); 417 } __except(topLevelExceptionFilter( 418 (_EXCEPTION_POINTERS*)_exception_info())) { 419 // Nothing to do. 420 } 421 422 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); 423 424 // One less thread is executing 425 // When the VMThread gets here, the main thread may have already exited 426 // which frees the CodeHeap containing the Atomic::add code 427 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 428 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); 429 } 430 431 // If a thread has not deleted itself ("delete this") as part of its 432 // termination sequence, we have to ensure thread-local-storage is 433 // cleared before we actually terminate. No threads should ever be 434 // deleted asynchronously with respect to their termination. 435 if (Thread::current_or_null_safe() != NULL) { 436 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 437 thread->clear_thread_current(); 438 } 439 440 // Thread must not return from exit_process_or_thread(), but if it does, 441 // let it proceed to exit normally 442 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res); 443} 444 445static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, 446 int thread_id) { 447 // Allocate the OSThread object 448 OSThread* osthread = new OSThread(NULL, NULL); 449 if (osthread == NULL) return NULL; 450 451 // Initialize support for Java interrupts 452 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 453 if (interrupt_event == NULL) { 454 delete osthread; 455 return NULL; 456 } 457 osthread->set_interrupt_event(interrupt_event); 458 459 // Store info on the Win32 thread into the OSThread 460 osthread->set_thread_handle(thread_handle); 461 osthread->set_thread_id(thread_id); 462 463 if (UseNUMA) { 464 int lgrp_id = os::numa_get_group_id(); 465 if (lgrp_id != -1) { 466 thread->set_lgrp_id(lgrp_id); 467 } 468 } 469 470 // Initial thread state is INITIALIZED, not SUSPENDED 471 osthread->set_state(INITIALIZED); 472 473 return osthread; 474} 475 476 477bool os::create_attached_thread(JavaThread* thread) { 478#ifdef ASSERT 479 thread->verify_not_published(); 480#endif 481 HANDLE thread_h; 482 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 483 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 484 fatal("DuplicateHandle failed\n"); 485 } 486 OSThread* osthread = create_os_thread(thread, thread_h, 487 (int)current_thread_id()); 488 if (osthread == NULL) { 489 return false; 490 } 491 492 // Initial thread state is RUNNABLE 493 osthread->set_state(RUNNABLE); 494 495 thread->set_osthread(osthread); 496 497 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", 498 os::current_thread_id()); 499 500 return true; 501} 502 503bool os::create_main_thread(JavaThread* thread) { 504#ifdef ASSERT 505 thread->verify_not_published(); 506#endif 507 if (_starting_thread == NULL) { 508 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 509 if (_starting_thread == NULL) { 510 return false; 511 } 512 } 513 514 // The primordial thread is runnable from the start) 515 _starting_thread->set_state(RUNNABLE); 516 517 thread->set_osthread(_starting_thread); 518 return true; 519} 520 521// Helper function to trace _beginthreadex attributes, 522// similar to os::Posix::describe_pthread_attr() 523static char* describe_beginthreadex_attributes(char* buf, size_t buflen, 524 size_t stacksize, unsigned initflag) { 525 stringStream ss(buf, buflen); 526 if (stacksize == 0) { 527 ss.print("stacksize: default, "); 528 } else { 529 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); 530 } 531 ss.print("flags: "); 532 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " "); 533 #define ALL(X) \ 534 X(CREATE_SUSPENDED) \ 535 X(STACK_SIZE_PARAM_IS_A_RESERVATION) 536 ALL(PRINT_FLAG) 537 #undef ALL 538 #undef PRINT_FLAG 539 return buf; 540} 541 542// Allocate and initialize a new OSThread 543bool os::create_thread(Thread* thread, ThreadType thr_type, 544 size_t stack_size) { 545 unsigned thread_id; 546 547 // Allocate the OSThread object 548 OSThread* osthread = new OSThread(NULL, NULL); 549 if (osthread == NULL) { 550 return false; 551 } 552 553 // Initialize support for Java interrupts 554 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 555 if (interrupt_event == NULL) { 556 delete osthread; 557 return NULL; 558 } 559 osthread->set_interrupt_event(interrupt_event); 560 osthread->set_interrupted(false); 561 562 thread->set_osthread(osthread); 563 564 if (stack_size == 0) { 565 switch (thr_type) { 566 case os::java_thread: 567 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 568 if (JavaThread::stack_size_at_create() > 0) { 569 stack_size = JavaThread::stack_size_at_create(); 570 } 571 break; 572 case os::compiler_thread: 573 if (CompilerThreadStackSize > 0) { 574 stack_size = (size_t)(CompilerThreadStackSize * K); 575 break; 576 } // else fall through: 577 // use VMThreadStackSize if CompilerThreadStackSize is not defined 578 case os::vm_thread: 579 case os::pgc_thread: 580 case os::cgc_thread: 581 case os::watcher_thread: 582 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 583 break; 584 } 585 } 586 587 // Create the Win32 thread 588 // 589 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 590 // does not specify stack size. Instead, it specifies the size of 591 // initially committed space. The stack size is determined by 592 // PE header in the executable. If the committed "stack_size" is larger 593 // than default value in the PE header, the stack is rounded up to the 594 // nearest multiple of 1MB. For example if the launcher has default 595 // stack size of 320k, specifying any size less than 320k does not 596 // affect the actual stack size at all, it only affects the initial 597 // commitment. On the other hand, specifying 'stack_size' larger than 598 // default value may cause significant increase in memory usage, because 599 // not only the stack space will be rounded up to MB, but also the 600 // entire space is committed upfront. 601 // 602 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 603 // for CreateThread() that can treat 'stack_size' as stack size. However we 604 // are not supposed to call CreateThread() directly according to MSDN 605 // document because JVM uses C runtime library. The good news is that the 606 // flag appears to work with _beginthredex() as well. 607 608 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION; 609 HANDLE thread_handle = 610 (HANDLE)_beginthreadex(NULL, 611 (unsigned)stack_size, 612 (unsigned (__stdcall *)(void*)) thread_native_entry, 613 thread, 614 initflag, 615 &thread_id); 616 617 char buf[64]; 618 if (thread_handle != NULL) { 619 log_info(os, thread)("Thread started (tid: %u, attributes: %s)", 620 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag)); 621 } else { 622 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.", 623 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag)); 624 } 625 626 if (thread_handle == NULL) { 627 // Need to clean up stuff we've allocated so far 628 CloseHandle(osthread->interrupt_event()); 629 thread->set_osthread(NULL); 630 delete osthread; 631 return NULL; 632 } 633 634 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); 635 636 // Store info on the Win32 thread into the OSThread 637 osthread->set_thread_handle(thread_handle); 638 osthread->set_thread_id(thread_id); 639 640 // Initial thread state is INITIALIZED, not SUSPENDED 641 osthread->set_state(INITIALIZED); 642 643 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 644 return true; 645} 646 647 648// Free Win32 resources related to the OSThread 649void os::free_thread(OSThread* osthread) { 650 assert(osthread != NULL, "osthread not set"); 651 652 // We are told to free resources of the argument thread, 653 // but we can only really operate on the current thread. 654 assert(Thread::current()->osthread() == osthread, 655 "os::free_thread but not current thread"); 656 657 CloseHandle(osthread->thread_handle()); 658 CloseHandle(osthread->interrupt_event()); 659 delete osthread; 660} 661 662static jlong first_filetime; 663static jlong initial_performance_count; 664static jlong performance_frequency; 665 666 667jlong as_long(LARGE_INTEGER x) { 668 jlong result = 0; // initialization to avoid warning 669 set_high(&result, x.HighPart); 670 set_low(&result, x.LowPart); 671 return result; 672} 673 674 675jlong os::elapsed_counter() { 676 LARGE_INTEGER count; 677 QueryPerformanceCounter(&count); 678 return as_long(count) - initial_performance_count; 679} 680 681 682jlong os::elapsed_frequency() { 683 return performance_frequency; 684} 685 686 687julong os::available_memory() { 688 return win32::available_memory(); 689} 690 691julong os::win32::available_memory() { 692 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 693 // value if total memory is larger than 4GB 694 MEMORYSTATUSEX ms; 695 ms.dwLength = sizeof(ms); 696 GlobalMemoryStatusEx(&ms); 697 698 return (julong)ms.ullAvailPhys; 699} 700 701julong os::physical_memory() { 702 return win32::physical_memory(); 703} 704 705bool os::has_allocatable_memory_limit(julong* limit) { 706 MEMORYSTATUSEX ms; 707 ms.dwLength = sizeof(ms); 708 GlobalMemoryStatusEx(&ms); 709#ifdef _LP64 710 *limit = (julong)ms.ullAvailVirtual; 711 return true; 712#else 713 // Limit to 1400m because of the 2gb address space wall 714 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual); 715 return true; 716#endif 717} 718 719int os::active_processor_count() { 720 DWORD_PTR lpProcessAffinityMask = 0; 721 DWORD_PTR lpSystemAffinityMask = 0; 722 int proc_count = processor_count(); 723 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 724 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 725 // Nof active processors is number of bits in process affinity mask 726 int bitcount = 0; 727 while (lpProcessAffinityMask != 0) { 728 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 729 bitcount++; 730 } 731 return bitcount; 732 } else { 733 return proc_count; 734 } 735} 736 737void os::set_native_thread_name(const char *name) { 738 739 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx 740 // 741 // Note that unfortunately this only works if the process 742 // is already attached to a debugger; debugger must observe 743 // the exception below to show the correct name. 744 745 // If there is no debugger attached skip raising the exception 746 if (!IsDebuggerPresent()) { 747 return; 748 } 749 750 const DWORD MS_VC_EXCEPTION = 0x406D1388; 751 struct { 752 DWORD dwType; // must be 0x1000 753 LPCSTR szName; // pointer to name (in user addr space) 754 DWORD dwThreadID; // thread ID (-1=caller thread) 755 DWORD dwFlags; // reserved for future use, must be zero 756 } info; 757 758 info.dwType = 0x1000; 759 info.szName = name; 760 info.dwThreadID = -1; 761 info.dwFlags = 0; 762 763 __try { 764 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info ); 765 } __except(EXCEPTION_EXECUTE_HANDLER) {} 766} 767 768bool os::distribute_processes(uint length, uint* distribution) { 769 // Not yet implemented. 770 return false; 771} 772 773bool os::bind_to_processor(uint processor_id) { 774 // Not yet implemented. 775 return false; 776} 777 778void os::win32::initialize_performance_counter() { 779 LARGE_INTEGER count; 780 QueryPerformanceFrequency(&count); 781 performance_frequency = as_long(count); 782 QueryPerformanceCounter(&count); 783 initial_performance_count = as_long(count); 784} 785 786 787double os::elapsedTime() { 788 return (double) elapsed_counter() / (double) elapsed_frequency(); 789} 790 791 792// Windows format: 793// The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 794// Java format: 795// Java standards require the number of milliseconds since 1/1/1970 796 797// Constant offset - calculated using offset() 798static jlong _offset = 116444736000000000; 799// Fake time counter for reproducible results when debugging 800static jlong fake_time = 0; 801 802#ifdef ASSERT 803// Just to be safe, recalculate the offset in debug mode 804static jlong _calculated_offset = 0; 805static int _has_calculated_offset = 0; 806 807jlong offset() { 808 if (_has_calculated_offset) return _calculated_offset; 809 SYSTEMTIME java_origin; 810 java_origin.wYear = 1970; 811 java_origin.wMonth = 1; 812 java_origin.wDayOfWeek = 0; // ignored 813 java_origin.wDay = 1; 814 java_origin.wHour = 0; 815 java_origin.wMinute = 0; 816 java_origin.wSecond = 0; 817 java_origin.wMilliseconds = 0; 818 FILETIME jot; 819 if (!SystemTimeToFileTime(&java_origin, &jot)) { 820 fatal("Error = %d\nWindows error", GetLastError()); 821 } 822 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 823 _has_calculated_offset = 1; 824 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 825 return _calculated_offset; 826} 827#else 828jlong offset() { 829 return _offset; 830} 831#endif 832 833jlong windows_to_java_time(FILETIME wt) { 834 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 835 return (a - offset()) / 10000; 836} 837 838// Returns time ticks in (10th of micro seconds) 839jlong windows_to_time_ticks(FILETIME wt) { 840 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 841 return (a - offset()); 842} 843 844FILETIME java_to_windows_time(jlong l) { 845 jlong a = (l * 10000) + offset(); 846 FILETIME result; 847 result.dwHighDateTime = high(a); 848 result.dwLowDateTime = low(a); 849 return result; 850} 851 852bool os::supports_vtime() { return true; } 853bool os::enable_vtime() { return false; } 854bool os::vtime_enabled() { return false; } 855 856double os::elapsedVTime() { 857 FILETIME created; 858 FILETIME exited; 859 FILETIME kernel; 860 FILETIME user; 861 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) { 862 // the resolution of windows_to_java_time() should be sufficient (ms) 863 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS; 864 } else { 865 return elapsedTime(); 866 } 867} 868 869jlong os::javaTimeMillis() { 870 if (UseFakeTimers) { 871 return fake_time++; 872 } else { 873 FILETIME wt; 874 GetSystemTimeAsFileTime(&wt); 875 return windows_to_java_time(wt); 876 } 877} 878 879void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 880 FILETIME wt; 881 GetSystemTimeAsFileTime(&wt); 882 jlong ticks = windows_to_time_ticks(wt); // 10th of micros 883 jlong secs = jlong(ticks / 10000000); // 10000 * 1000 884 seconds = secs; 885 nanos = jlong(ticks - (secs*10000000)) * 100; 886} 887 888jlong os::javaTimeNanos() { 889 LARGE_INTEGER current_count; 890 QueryPerformanceCounter(¤t_count); 891 double current = as_long(current_count); 892 double freq = performance_frequency; 893 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC); 894 return time; 895} 896 897void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 898 jlong freq = performance_frequency; 899 if (freq < NANOSECS_PER_SEC) { 900 // the performance counter is 64 bits and we will 901 // be multiplying it -- so no wrap in 64 bits 902 info_ptr->max_value = ALL_64_BITS; 903 } else if (freq > NANOSECS_PER_SEC) { 904 // use the max value the counter can reach to 905 // determine the max value which could be returned 906 julong max_counter = (julong)ALL_64_BITS; 907 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC)); 908 } else { 909 // the performance counter is 64 bits and we will 910 // be using it directly -- so no wrap in 64 bits 911 info_ptr->max_value = ALL_64_BITS; 912 } 913 914 // using a counter, so no skipping 915 info_ptr->may_skip_backward = false; 916 info_ptr->may_skip_forward = false; 917 918 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 919} 920 921char* os::local_time_string(char *buf, size_t buflen) { 922 SYSTEMTIME st; 923 GetLocalTime(&st); 924 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 925 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 926 return buf; 927} 928 929bool os::getTimesSecs(double* process_real_time, 930 double* process_user_time, 931 double* process_system_time) { 932 HANDLE h_process = GetCurrentProcess(); 933 FILETIME create_time, exit_time, kernel_time, user_time; 934 BOOL result = GetProcessTimes(h_process, 935 &create_time, 936 &exit_time, 937 &kernel_time, 938 &user_time); 939 if (result != 0) { 940 FILETIME wt; 941 GetSystemTimeAsFileTime(&wt); 942 jlong rtc_millis = windows_to_java_time(wt); 943 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 944 *process_user_time = 945 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS); 946 *process_system_time = 947 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS); 948 return true; 949 } else { 950 return false; 951 } 952} 953 954void os::shutdown() { 955 // allow PerfMemory to attempt cleanup of any persistent resources 956 perfMemory_exit(); 957 958 // flush buffered output, finish log files 959 ostream_abort(); 960 961 // Check for abort hook 962 abort_hook_t abort_hook = Arguments::abort_hook(); 963 if (abort_hook != NULL) { 964 abort_hook(); 965 } 966} 967 968 969static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 970 PMINIDUMP_EXCEPTION_INFORMATION, 971 PMINIDUMP_USER_STREAM_INFORMATION, 972 PMINIDUMP_CALLBACK_INFORMATION); 973 974static HANDLE dumpFile = NULL; 975 976// Check if dump file can be created. 977void os::check_dump_limit(char* buffer, size_t buffsz) { 978 bool status = true; 979 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) { 980 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line"); 981 status = false; 982 } 983 984#ifndef ASSERT 985 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) { 986 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows"); 987 status = false; 988 } 989#endif 990 991 if (status) { 992 const char* cwd = get_current_directory(NULL, 0); 993 int pid = current_process_id(); 994 if (cwd != NULL) { 995 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid); 996 } else { 997 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid); 998 } 999 1000 if (dumpFile == NULL && 1001 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL)) 1002 == INVALID_HANDLE_VALUE) { 1003 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError()); 1004 status = false; 1005 } 1006 } 1007 VMError::record_coredump_status(buffer, status); 1008} 1009 1010void os::abort(bool dump_core, void* siginfo, const void* context) { 1011 HINSTANCE dbghelp; 1012 EXCEPTION_POINTERS ep; 1013 MINIDUMP_EXCEPTION_INFORMATION mei; 1014 MINIDUMP_EXCEPTION_INFORMATION* pmei; 1015 1016 HANDLE hProcess = GetCurrentProcess(); 1017 DWORD processId = GetCurrentProcessId(); 1018 MINIDUMP_TYPE dumpType; 1019 1020 shutdown(); 1021 if (!dump_core || dumpFile == NULL) { 1022 if (dumpFile != NULL) { 1023 CloseHandle(dumpFile); 1024 } 1025 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1026 } 1027 1028 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0); 1029 1030 if (dbghelp == NULL) { 1031 jio_fprintf(stderr, "Failed to load dbghelp.dll\n"); 1032 CloseHandle(dumpFile); 1033 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1034 } 1035 1036 _MiniDumpWriteDump = 1037 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 1038 PMINIDUMP_EXCEPTION_INFORMATION, 1039 PMINIDUMP_USER_STREAM_INFORMATION, 1040 PMINIDUMP_CALLBACK_INFORMATION), 1041 GetProcAddress(dbghelp, 1042 "MiniDumpWriteDump")); 1043 1044 if (_MiniDumpWriteDump == NULL) { 1045 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n"); 1046 CloseHandle(dumpFile); 1047 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1048 } 1049 1050 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData | 1051 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules); 1052 1053 if (siginfo != NULL && context != NULL) { 1054 ep.ContextRecord = (PCONTEXT) context; 1055 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo; 1056 1057 mei.ThreadId = GetCurrentThreadId(); 1058 mei.ExceptionPointers = &ep; 1059 pmei = &mei; 1060 } else { 1061 pmei = NULL; 1062 } 1063 1064 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all 1065 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then. 1066 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false && 1067 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) { 1068 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError()); 1069 } 1070 CloseHandle(dumpFile); 1071 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1072} 1073 1074// Die immediately, no exit hook, no abort hook, no cleanup. 1075void os::die() { 1076 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1); 1077} 1078 1079// Directory routines copied from src/win32/native/java/io/dirent_md.c 1080// * dirent_md.c 1.15 00/02/02 1081// 1082// The declarations for DIR and struct dirent are in jvm_win32.h. 1083 1084// Caller must have already run dirname through JVM_NativePath, which removes 1085// duplicate slashes and converts all instances of '/' into '\\'. 1086 1087DIR * os::opendir(const char *dirname) { 1088 assert(dirname != NULL, "just checking"); // hotspot change 1089 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal); 1090 DWORD fattr; // hotspot change 1091 char alt_dirname[4] = { 0, 0, 0, 0 }; 1092 1093 if (dirp == 0) { 1094 errno = ENOMEM; 1095 return 0; 1096 } 1097 1098 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it 1099 // as a directory in FindFirstFile(). We detect this case here and 1100 // prepend the current drive name. 1101 // 1102 if (dirname[1] == '\0' && dirname[0] == '\\') { 1103 alt_dirname[0] = _getdrive() + 'A' - 1; 1104 alt_dirname[1] = ':'; 1105 alt_dirname[2] = '\\'; 1106 alt_dirname[3] = '\0'; 1107 dirname = alt_dirname; 1108 } 1109 1110 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal); 1111 if (dirp->path == 0) { 1112 free(dirp); 1113 errno = ENOMEM; 1114 return 0; 1115 } 1116 strcpy(dirp->path, dirname); 1117 1118 fattr = GetFileAttributes(dirp->path); 1119 if (fattr == 0xffffffff) { 1120 free(dirp->path); 1121 free(dirp); 1122 errno = ENOENT; 1123 return 0; 1124 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 1125 free(dirp->path); 1126 free(dirp); 1127 errno = ENOTDIR; 1128 return 0; 1129 } 1130 1131 // Append "*.*", or possibly "\\*.*", to path 1132 if (dirp->path[1] == ':' && 1133 (dirp->path[2] == '\0' || 1134 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 1135 // No '\\' needed for cases like "Z:" or "Z:\" 1136 strcat(dirp->path, "*.*"); 1137 } else { 1138 strcat(dirp->path, "\\*.*"); 1139 } 1140 1141 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 1142 if (dirp->handle == INVALID_HANDLE_VALUE) { 1143 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 1144 free(dirp->path); 1145 free(dirp); 1146 errno = EACCES; 1147 return 0; 1148 } 1149 } 1150 return dirp; 1151} 1152 1153// parameter dbuf unused on Windows 1154struct dirent * os::readdir(DIR *dirp, dirent *dbuf) { 1155 assert(dirp != NULL, "just checking"); // hotspot change 1156 if (dirp->handle == INVALID_HANDLE_VALUE) { 1157 return 0; 1158 } 1159 1160 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 1161 1162 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 1163 if (GetLastError() == ERROR_INVALID_HANDLE) { 1164 errno = EBADF; 1165 return 0; 1166 } 1167 FindClose(dirp->handle); 1168 dirp->handle = INVALID_HANDLE_VALUE; 1169 } 1170 1171 return &dirp->dirent; 1172} 1173 1174int os::closedir(DIR *dirp) { 1175 assert(dirp != NULL, "just checking"); // hotspot change 1176 if (dirp->handle != INVALID_HANDLE_VALUE) { 1177 if (!FindClose(dirp->handle)) { 1178 errno = EBADF; 1179 return -1; 1180 } 1181 dirp->handle = INVALID_HANDLE_VALUE; 1182 } 1183 free(dirp->path); 1184 free(dirp); 1185 return 0; 1186} 1187 1188// This must be hard coded because it's the system's temporary 1189// directory not the java application's temp directory, ala java.io.tmpdir. 1190const char* os::get_temp_directory() { 1191 static char path_buf[MAX_PATH]; 1192 if (GetTempPath(MAX_PATH, path_buf) > 0) { 1193 return path_buf; 1194 } else { 1195 path_buf[0] = '\0'; 1196 return path_buf; 1197 } 1198} 1199 1200static bool file_exists(const char* filename) { 1201 if (filename == NULL || strlen(filename) == 0) { 1202 return false; 1203 } 1204 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES; 1205} 1206 1207bool os::dll_build_name(char *buffer, size_t buflen, 1208 const char* pname, const char* fname) { 1209 bool retval = false; 1210 const size_t pnamelen = pname ? strlen(pname) : 0; 1211 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0; 1212 1213 // Return error on buffer overflow. 1214 if (pnamelen + strlen(fname) + 10 > buflen) { 1215 return retval; 1216 } 1217 1218 if (pnamelen == 0) { 1219 jio_snprintf(buffer, buflen, "%s.dll", fname); 1220 retval = true; 1221 } else if (c == ':' || c == '\\') { 1222 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname); 1223 retval = true; 1224 } else if (strchr(pname, *os::path_separator()) != NULL) { 1225 int n; 1226 char** pelements = split_path(pname, &n); 1227 if (pelements == NULL) { 1228 return false; 1229 } 1230 for (int i = 0; i < n; i++) { 1231 char* path = pelements[i]; 1232 // Really shouldn't be NULL, but check can't hurt 1233 size_t plen = (path == NULL) ? 0 : strlen(path); 1234 if (plen == 0) { 1235 continue; // skip the empty path values 1236 } 1237 const char lastchar = path[plen - 1]; 1238 if (lastchar == ':' || lastchar == '\\') { 1239 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname); 1240 } else { 1241 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname); 1242 } 1243 if (file_exists(buffer)) { 1244 retval = true; 1245 break; 1246 } 1247 } 1248 // release the storage 1249 for (int i = 0; i < n; i++) { 1250 if (pelements[i] != NULL) { 1251 FREE_C_HEAP_ARRAY(char, pelements[i]); 1252 } 1253 } 1254 if (pelements != NULL) { 1255 FREE_C_HEAP_ARRAY(char*, pelements); 1256 } 1257 } else { 1258 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname); 1259 retval = true; 1260 } 1261 return retval; 1262} 1263 1264// Needs to be in os specific directory because windows requires another 1265// header file <direct.h> 1266const char* os::get_current_directory(char *buf, size_t buflen) { 1267 int n = static_cast<int>(buflen); 1268 if (buflen > INT_MAX) n = INT_MAX; 1269 return _getcwd(buf, n); 1270} 1271 1272//----------------------------------------------------------- 1273// Helper functions for fatal error handler 1274#ifdef _WIN64 1275// Helper routine which returns true if address in 1276// within the NTDLL address space. 1277// 1278static bool _addr_in_ntdll(address addr) { 1279 HMODULE hmod; 1280 MODULEINFO minfo; 1281 1282 hmod = GetModuleHandle("NTDLL.DLL"); 1283 if (hmod == NULL) return false; 1284 if (!GetModuleInformation(GetCurrentProcess(), hmod, 1285 &minfo, sizeof(MODULEINFO))) { 1286 return false; 1287 } 1288 1289 if ((addr >= minfo.lpBaseOfDll) && 1290 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) { 1291 return true; 1292 } else { 1293 return false; 1294 } 1295} 1296#endif 1297 1298struct _modinfo { 1299 address addr; 1300 char* full_path; // point to a char buffer 1301 int buflen; // size of the buffer 1302 address base_addr; 1303}; 1304 1305static int _locate_module_by_addr(const char * mod_fname, address base_addr, 1306 address top_address, void * param) { 1307 struct _modinfo *pmod = (struct _modinfo *)param; 1308 if (!pmod) return -1; 1309 1310 if (base_addr <= pmod->addr && 1311 top_address > pmod->addr) { 1312 // if a buffer is provided, copy path name to the buffer 1313 if (pmod->full_path) { 1314 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1315 } 1316 pmod->base_addr = base_addr; 1317 return 1; 1318 } 1319 return 0; 1320} 1321 1322bool os::dll_address_to_library_name(address addr, char* buf, 1323 int buflen, int* offset) { 1324 // buf is not optional, but offset is optional 1325 assert(buf != NULL, "sanity check"); 1326 1327// NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1328// return the full path to the DLL file, sometimes it returns path 1329// to the corresponding PDB file (debug info); sometimes it only 1330// returns partial path, which makes life painful. 1331 1332 struct _modinfo mi; 1333 mi.addr = addr; 1334 mi.full_path = buf; 1335 mi.buflen = buflen; 1336 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) { 1337 // buf already contains path name 1338 if (offset) *offset = addr - mi.base_addr; 1339 return true; 1340 } 1341 1342 buf[0] = '\0'; 1343 if (offset) *offset = -1; 1344 return false; 1345} 1346 1347bool os::dll_address_to_function_name(address addr, char *buf, 1348 int buflen, int *offset, 1349 bool demangle) { 1350 // buf is not optional, but offset is optional 1351 assert(buf != NULL, "sanity check"); 1352 1353 if (Decoder::decode(addr, buf, buflen, offset, demangle)) { 1354 return true; 1355 } 1356 if (offset != NULL) *offset = -1; 1357 buf[0] = '\0'; 1358 return false; 1359} 1360 1361// save the start and end address of jvm.dll into param[0] and param[1] 1362static int _locate_jvm_dll(const char* mod_fname, address base_addr, 1363 address top_address, void * param) { 1364 if (!param) return -1; 1365 1366 if (base_addr <= (address)_locate_jvm_dll && 1367 top_address > (address)_locate_jvm_dll) { 1368 ((address*)param)[0] = base_addr; 1369 ((address*)param)[1] = top_address; 1370 return 1; 1371 } 1372 return 0; 1373} 1374 1375address vm_lib_location[2]; // start and end address of jvm.dll 1376 1377// check if addr is inside jvm.dll 1378bool os::address_is_in_vm(address addr) { 1379 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1380 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) { 1381 assert(false, "Can't find jvm module."); 1382 return false; 1383 } 1384 } 1385 1386 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1387} 1388 1389// print module info; param is outputStream* 1390static int _print_module(const char* fname, address base_address, 1391 address top_address, void* param) { 1392 if (!param) return -1; 1393 1394 outputStream* st = (outputStream*)param; 1395 1396 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname); 1397 return 0; 1398} 1399 1400// Loads .dll/.so and 1401// in case of error it checks if .dll/.so was built for the 1402// same architecture as Hotspot is running on 1403void * os::dll_load(const char *name, char *ebuf, int ebuflen) { 1404 void * result = LoadLibrary(name); 1405 if (result != NULL) { 1406 return result; 1407 } 1408 1409 DWORD errcode = GetLastError(); 1410 if (errcode == ERROR_MOD_NOT_FOUND) { 1411 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1); 1412 ebuf[ebuflen - 1] = '\0'; 1413 return NULL; 1414 } 1415 1416 // Parsing dll below 1417 // If we can read dll-info and find that dll was built 1418 // for an architecture other than Hotspot is running in 1419 // - then print to buffer "DLL was built for a different architecture" 1420 // else call os::lasterror to obtain system error message 1421 1422 // Read system error message into ebuf 1423 // It may or may not be overwritten below (in the for loop and just above) 1424 lasterror(ebuf, (size_t) ebuflen); 1425 ebuf[ebuflen - 1] = '\0'; 1426 int fd = ::open(name, O_RDONLY | O_BINARY, 0); 1427 if (fd < 0) { 1428 return NULL; 1429 } 1430 1431 uint32_t signature_offset; 1432 uint16_t lib_arch = 0; 1433 bool failed_to_get_lib_arch = 1434 ( // Go to position 3c in the dll 1435 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0) 1436 || 1437 // Read location of signature 1438 (sizeof(signature_offset) != 1439 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset)))) 1440 || 1441 // Go to COFF File Header in dll 1442 // that is located after "signature" (4 bytes long) 1443 (os::seek_to_file_offset(fd, 1444 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0) 1445 || 1446 // Read field that contains code of architecture 1447 // that dll was built for 1448 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch)))) 1449 ); 1450 1451 ::close(fd); 1452 if (failed_to_get_lib_arch) { 1453 // file i/o error - report os::lasterror(...) msg 1454 return NULL; 1455 } 1456 1457 typedef struct { 1458 uint16_t arch_code; 1459 char* arch_name; 1460 } arch_t; 1461 1462 static const arch_t arch_array[] = { 1463 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1464 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"} 1465 }; 1466#if (defined _M_AMD64) 1467 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64; 1468#elif (defined _M_IX86) 1469 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386; 1470#else 1471 #error Method os::dll_load requires that one of following \ 1472 is defined :_M_AMD64 or _M_IX86 1473#endif 1474 1475 1476 // Obtain a string for printf operation 1477 // lib_arch_str shall contain string what platform this .dll was built for 1478 // running_arch_str shall string contain what platform Hotspot was built for 1479 char *running_arch_str = NULL, *lib_arch_str = NULL; 1480 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) { 1481 if (lib_arch == arch_array[i].arch_code) { 1482 lib_arch_str = arch_array[i].arch_name; 1483 } 1484 if (running_arch == arch_array[i].arch_code) { 1485 running_arch_str = arch_array[i].arch_name; 1486 } 1487 } 1488 1489 assert(running_arch_str, 1490 "Didn't find running architecture code in arch_array"); 1491 1492 // If the architecture is right 1493 // but some other error took place - report os::lasterror(...) msg 1494 if (lib_arch == running_arch) { 1495 return NULL; 1496 } 1497 1498 if (lib_arch_str != NULL) { 1499 ::_snprintf(ebuf, ebuflen - 1, 1500 "Can't load %s-bit .dll on a %s-bit platform", 1501 lib_arch_str, running_arch_str); 1502 } else { 1503 // don't know what architecture this dll was build for 1504 ::_snprintf(ebuf, ebuflen - 1, 1505 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1506 lib_arch, running_arch_str); 1507 } 1508 1509 return NULL; 1510} 1511 1512void os::print_dll_info(outputStream *st) { 1513 st->print_cr("Dynamic libraries:"); 1514 get_loaded_modules_info(_print_module, (void *)st); 1515} 1516 1517int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1518 HANDLE hProcess; 1519 1520# define MAX_NUM_MODULES 128 1521 HMODULE modules[MAX_NUM_MODULES]; 1522 static char filename[MAX_PATH]; 1523 int result = 0; 1524 1525 int pid = os::current_process_id(); 1526 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1527 FALSE, pid); 1528 if (hProcess == NULL) return 0; 1529 1530 DWORD size_needed; 1531 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) { 1532 CloseHandle(hProcess); 1533 return 0; 1534 } 1535 1536 // number of modules that are currently loaded 1537 int num_modules = size_needed / sizeof(HMODULE); 1538 1539 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1540 // Get Full pathname: 1541 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) { 1542 filename[0] = '\0'; 1543 } 1544 1545 MODULEINFO modinfo; 1546 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) { 1547 modinfo.lpBaseOfDll = NULL; 1548 modinfo.SizeOfImage = 0; 1549 } 1550 1551 // Invoke callback function 1552 result = callback(filename, (address)modinfo.lpBaseOfDll, 1553 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param); 1554 if (result) break; 1555 } 1556 1557 CloseHandle(hProcess); 1558 return result; 1559} 1560 1561bool os::get_host_name(char* buf, size_t buflen) { 1562 DWORD size = (DWORD)buflen; 1563 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE); 1564} 1565 1566void os::get_summary_os_info(char* buf, size_t buflen) { 1567 stringStream sst(buf, buflen); 1568 os::win32::print_windows_version(&sst); 1569 // chop off newline character 1570 char* nl = strchr(buf, '\n'); 1571 if (nl != NULL) *nl = '\0'; 1572} 1573 1574int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) { 1575 int ret = vsnprintf(buf, len, fmt, args); 1576 // Get the correct buffer size if buf is too small 1577 if (ret < 0) { 1578 return _vscprintf(fmt, args); 1579 } 1580 return ret; 1581} 1582 1583static inline time_t get_mtime(const char* filename) { 1584 struct stat st; 1585 int ret = os::stat(filename, &st); 1586 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 1587 return st.st_mtime; 1588} 1589 1590int os::compare_file_modified_times(const char* file1, const char* file2) { 1591 time_t t1 = get_mtime(file1); 1592 time_t t2 = get_mtime(file2); 1593 return t1 - t2; 1594} 1595 1596void os::print_os_info_brief(outputStream* st) { 1597 os::print_os_info(st); 1598} 1599 1600void os::print_os_info(outputStream* st) { 1601#ifdef ASSERT 1602 char buffer[1024]; 1603 st->print("HostName: "); 1604 if (get_host_name(buffer, sizeof(buffer))) { 1605 st->print("%s ", buffer); 1606 } else { 1607 st->print("N/A "); 1608 } 1609#endif 1610 st->print("OS:"); 1611 os::win32::print_windows_version(st); 1612} 1613 1614void os::win32::print_windows_version(outputStream* st) { 1615 OSVERSIONINFOEX osvi; 1616 VS_FIXEDFILEINFO *file_info; 1617 TCHAR kernel32_path[MAX_PATH]; 1618 UINT len, ret; 1619 1620 // Use the GetVersionEx information to see if we're on a server or 1621 // workstation edition of Windows. Starting with Windows 8.1 we can't 1622 // trust the OS version information returned by this API. 1623 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1624 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1625 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1626 st->print_cr("Call to GetVersionEx failed"); 1627 return; 1628 } 1629 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION); 1630 1631 // Get the full path to \Windows\System32\kernel32.dll and use that for 1632 // determining what version of Windows we're running on. 1633 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1; 1634 ret = GetSystemDirectory(kernel32_path, len); 1635 if (ret == 0 || ret > len) { 1636 st->print_cr("Call to GetSystemDirectory failed"); 1637 return; 1638 } 1639 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret); 1640 1641 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL); 1642 if (version_size == 0) { 1643 st->print_cr("Call to GetFileVersionInfoSize failed"); 1644 return; 1645 } 1646 1647 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal); 1648 if (version_info == NULL) { 1649 st->print_cr("Failed to allocate version_info"); 1650 return; 1651 } 1652 1653 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) { 1654 os::free(version_info); 1655 st->print_cr("Call to GetFileVersionInfo failed"); 1656 return; 1657 } 1658 1659 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) { 1660 os::free(version_info); 1661 st->print_cr("Call to VerQueryValue failed"); 1662 return; 1663 } 1664 1665 int major_version = HIWORD(file_info->dwProductVersionMS); 1666 int minor_version = LOWORD(file_info->dwProductVersionMS); 1667 int build_number = HIWORD(file_info->dwProductVersionLS); 1668 int build_minor = LOWORD(file_info->dwProductVersionLS); 1669 int os_vers = major_version * 1000 + minor_version; 1670 os::free(version_info); 1671 1672 st->print(" Windows "); 1673 switch (os_vers) { 1674 1675 case 6000: 1676 if (is_workstation) { 1677 st->print("Vista"); 1678 } else { 1679 st->print("Server 2008"); 1680 } 1681 break; 1682 1683 case 6001: 1684 if (is_workstation) { 1685 st->print("7"); 1686 } else { 1687 st->print("Server 2008 R2"); 1688 } 1689 break; 1690 1691 case 6002: 1692 if (is_workstation) { 1693 st->print("8"); 1694 } else { 1695 st->print("Server 2012"); 1696 } 1697 break; 1698 1699 case 6003: 1700 if (is_workstation) { 1701 st->print("8.1"); 1702 } else { 1703 st->print("Server 2012 R2"); 1704 } 1705 break; 1706 1707 case 10000: 1708 if (is_workstation) { 1709 st->print("10"); 1710 } else { 1711 st->print("Server 2016"); 1712 } 1713 break; 1714 1715 default: 1716 // Unrecognized windows, print out its major and minor versions 1717 st->print("%d.%d", major_version, minor_version); 1718 break; 1719 } 1720 1721 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1722 // find out whether we are running on 64 bit processor or not 1723 SYSTEM_INFO si; 1724 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1725 GetNativeSystemInfo(&si); 1726 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1727 st->print(" , 64 bit"); 1728 } 1729 1730 st->print(" Build %d", build_number); 1731 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor); 1732 st->cr(); 1733} 1734 1735void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1736 // Nothing to do for now. 1737} 1738 1739void os::get_summary_cpu_info(char* buf, size_t buflen) { 1740 HKEY key; 1741 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE, 1742 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key); 1743 if (status == ERROR_SUCCESS) { 1744 DWORD size = (DWORD)buflen; 1745 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size); 1746 if (status != ERROR_SUCCESS) { 1747 strncpy(buf, "## __CPU__", buflen); 1748 } 1749 RegCloseKey(key); 1750 } else { 1751 // Put generic cpu info to return 1752 strncpy(buf, "## __CPU__", buflen); 1753 } 1754} 1755 1756void os::print_memory_info(outputStream* st) { 1757 st->print("Memory:"); 1758 st->print(" %dk page", os::vm_page_size()>>10); 1759 1760 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1761 // value if total memory is larger than 4GB 1762 MEMORYSTATUSEX ms; 1763 ms.dwLength = sizeof(ms); 1764 GlobalMemoryStatusEx(&ms); 1765 1766 st->print(", physical %uk", os::physical_memory() >> 10); 1767 st->print("(%uk free)", os::available_memory() >> 10); 1768 1769 st->print(", swap %uk", ms.ullTotalPageFile >> 10); 1770 st->print("(%uk free)", ms.ullAvailPageFile >> 10); 1771 st->cr(); 1772} 1773 1774void os::print_siginfo(outputStream *st, const void* siginfo) { 1775 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo; 1776 st->print("siginfo:"); 1777 1778 char tmp[64]; 1779 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) { 1780 strcpy(tmp, "EXCEPTION_??"); 1781 } 1782 st->print(" %s (0x%x)", tmp, er->ExceptionCode); 1783 1784 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION || 1785 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) && 1786 er->NumberParameters >= 2) { 1787 switch (er->ExceptionInformation[0]) { 1788 case 0: st->print(", reading address"); break; 1789 case 1: st->print(", writing address"); break; 1790 case 8: st->print(", data execution prevention violation at address"); break; 1791 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1792 er->ExceptionInformation[0]); 1793 } 1794 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1795 } else { 1796 int num = er->NumberParameters; 1797 if (num > 0) { 1798 st->print(", ExceptionInformation="); 1799 for (int i = 0; i < num; i++) { 1800 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1801 } 1802 } 1803 } 1804 st->cr(); 1805} 1806 1807void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1808 // do nothing 1809} 1810 1811static char saved_jvm_path[MAX_PATH] = {0}; 1812 1813// Find the full path to the current module, jvm.dll 1814void os::jvm_path(char *buf, jint buflen) { 1815 // Error checking. 1816 if (buflen < MAX_PATH) { 1817 assert(false, "must use a large-enough buffer"); 1818 buf[0] = '\0'; 1819 return; 1820 } 1821 // Lazy resolve the path to current module. 1822 if (saved_jvm_path[0] != 0) { 1823 strcpy(buf, saved_jvm_path); 1824 return; 1825 } 1826 1827 buf[0] = '\0'; 1828 if (Arguments::sun_java_launcher_is_altjvm()) { 1829 // Support for the java launcher's '-XXaltjvm=<path>' option. Check 1830 // for a JAVA_HOME environment variable and fix up the path so it 1831 // looks like jvm.dll is installed there (append a fake suffix 1832 // hotspot/jvm.dll). 1833 char* java_home_var = ::getenv("JAVA_HOME"); 1834 if (java_home_var != NULL && java_home_var[0] != 0 && 1835 strlen(java_home_var) < (size_t)buflen) { 1836 strncpy(buf, java_home_var, buflen); 1837 1838 // determine if this is a legacy image or modules image 1839 // modules image doesn't have "jre" subdirectory 1840 size_t len = strlen(buf); 1841 char* jrebin_p = buf + len; 1842 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1843 if (0 != _access(buf, 0)) { 1844 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1845 } 1846 len = strlen(buf); 1847 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1848 } 1849 } 1850 1851 if (buf[0] == '\0') { 1852 GetModuleFileName(vm_lib_handle, buf, buflen); 1853 } 1854 strncpy(saved_jvm_path, buf, MAX_PATH); 1855 saved_jvm_path[MAX_PATH - 1] = '\0'; 1856} 1857 1858 1859void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1860#ifndef _WIN64 1861 st->print("_"); 1862#endif 1863} 1864 1865 1866void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1867#ifndef _WIN64 1868 st->print("@%d", args_size * sizeof(int)); 1869#endif 1870} 1871 1872// This method is a copy of JDK's sysGetLastErrorString 1873// from src/windows/hpi/src/system_md.c 1874 1875size_t os::lasterror(char* buf, size_t len) { 1876 DWORD errval; 1877 1878 if ((errval = GetLastError()) != 0) { 1879 // DOS error 1880 size_t n = (size_t)FormatMessage( 1881 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1882 NULL, 1883 errval, 1884 0, 1885 buf, 1886 (DWORD)len, 1887 NULL); 1888 if (n > 3) { 1889 // Drop final '.', CR, LF 1890 if (buf[n - 1] == '\n') n--; 1891 if (buf[n - 1] == '\r') n--; 1892 if (buf[n - 1] == '.') n--; 1893 buf[n] = '\0'; 1894 } 1895 return n; 1896 } 1897 1898 if (errno != 0) { 1899 // C runtime error that has no corresponding DOS error code 1900 const char* s = os::strerror(errno); 1901 size_t n = strlen(s); 1902 if (n >= len) n = len - 1; 1903 strncpy(buf, s, n); 1904 buf[n] = '\0'; 1905 return n; 1906 } 1907 1908 return 0; 1909} 1910 1911int os::get_last_error() { 1912 DWORD error = GetLastError(); 1913 if (error == 0) { 1914 error = errno; 1915 } 1916 return (int)error; 1917} 1918 1919WindowsSemaphore::WindowsSemaphore(uint value) { 1920 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL); 1921 1922 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError()); 1923} 1924 1925WindowsSemaphore::~WindowsSemaphore() { 1926 ::CloseHandle(_semaphore); 1927} 1928 1929void WindowsSemaphore::signal(uint count) { 1930 if (count > 0) { 1931 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL); 1932 1933 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError()); 1934 } 1935} 1936 1937void WindowsSemaphore::wait() { 1938 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE); 1939 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError()); 1940 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret); 1941} 1942 1943bool WindowsSemaphore::trywait() { 1944 DWORD ret = ::WaitForSingleObject(_semaphore, 0); 1945 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError()); 1946 return ret == WAIT_OBJECT_0; 1947} 1948 1949// sun.misc.Signal 1950// NOTE that this is a workaround for an apparent kernel bug where if 1951// a signal handler for SIGBREAK is installed then that signal handler 1952// takes priority over the console control handler for CTRL_CLOSE_EVENT. 1953// See bug 4416763. 1954static void (*sigbreakHandler)(int) = NULL; 1955 1956static void UserHandler(int sig, void *siginfo, void *context) { 1957 os::signal_notify(sig); 1958 // We need to reinstate the signal handler each time... 1959 os::signal(sig, (void*)UserHandler); 1960} 1961 1962void* os::user_handler() { 1963 return (void*) UserHandler; 1964} 1965 1966void* os::signal(int signal_number, void* handler) { 1967 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1968 void (*oldHandler)(int) = sigbreakHandler; 1969 sigbreakHandler = (void (*)(int)) handler; 1970 return (void*) oldHandler; 1971 } else { 1972 return (void*)::signal(signal_number, (void (*)(int))handler); 1973 } 1974} 1975 1976void os::signal_raise(int signal_number) { 1977 raise(signal_number); 1978} 1979 1980// The Win32 C runtime library maps all console control events other than ^C 1981// into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1982// logoff, and shutdown events. We therefore install our own console handler 1983// that raises SIGTERM for the latter cases. 1984// 1985static BOOL WINAPI consoleHandler(DWORD event) { 1986 switch (event) { 1987 case CTRL_C_EVENT: 1988 if (VMError::is_error_reported()) { 1989 // Ctrl-C is pressed during error reporting, likely because the error 1990 // handler fails to abort. Let VM die immediately. 1991 os::die(); 1992 } 1993 1994 os::signal_raise(SIGINT); 1995 return TRUE; 1996 break; 1997 case CTRL_BREAK_EVENT: 1998 if (sigbreakHandler != NULL) { 1999 (*sigbreakHandler)(SIGBREAK); 2000 } 2001 return TRUE; 2002 break; 2003 case CTRL_LOGOFF_EVENT: { 2004 // Don't terminate JVM if it is running in a non-interactive session, 2005 // such as a service process. 2006 USEROBJECTFLAGS flags; 2007 HANDLE handle = GetProcessWindowStation(); 2008 if (handle != NULL && 2009 GetUserObjectInformation(handle, UOI_FLAGS, &flags, 2010 sizeof(USEROBJECTFLAGS), NULL)) { 2011 // If it is a non-interactive session, let next handler to deal 2012 // with it. 2013 if ((flags.dwFlags & WSF_VISIBLE) == 0) { 2014 return FALSE; 2015 } 2016 } 2017 } 2018 case CTRL_CLOSE_EVENT: 2019 case CTRL_SHUTDOWN_EVENT: 2020 os::signal_raise(SIGTERM); 2021 return TRUE; 2022 break; 2023 default: 2024 break; 2025 } 2026 return FALSE; 2027} 2028 2029// The following code is moved from os.cpp for making this 2030// code platform specific, which it is by its very nature. 2031 2032// Return maximum OS signal used + 1 for internal use only 2033// Used as exit signal for signal_thread 2034int os::sigexitnum_pd() { 2035 return NSIG; 2036} 2037 2038// a counter for each possible signal value, including signal_thread exit signal 2039static volatile jint pending_signals[NSIG+1] = { 0 }; 2040static HANDLE sig_sem = NULL; 2041 2042void os::signal_init_pd() { 2043 // Initialize signal structures 2044 memset((void*)pending_signals, 0, sizeof(pending_signals)); 2045 2046 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 2047 2048 // Programs embedding the VM do not want it to attempt to receive 2049 // events like CTRL_LOGOFF_EVENT, which are used to implement the 2050 // shutdown hooks mechanism introduced in 1.3. For example, when 2051 // the VM is run as part of a Windows NT service (i.e., a servlet 2052 // engine in a web server), the correct behavior is for any console 2053 // control handler to return FALSE, not TRUE, because the OS's 2054 // "final" handler for such events allows the process to continue if 2055 // it is a service (while terminating it if it is not a service). 2056 // To make this behavior uniform and the mechanism simpler, we 2057 // completely disable the VM's usage of these console events if -Xrs 2058 // (=ReduceSignalUsage) is specified. This means, for example, that 2059 // the CTRL-BREAK thread dump mechanism is also disabled in this 2060 // case. See bugs 4323062, 4345157, and related bugs. 2061 2062 if (!ReduceSignalUsage) { 2063 // Add a CTRL-C handler 2064 SetConsoleCtrlHandler(consoleHandler, TRUE); 2065 } 2066} 2067 2068void os::signal_notify(int signal_number) { 2069 BOOL ret; 2070 if (sig_sem != NULL) { 2071 Atomic::inc(&pending_signals[signal_number]); 2072 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2073 assert(ret != 0, "ReleaseSemaphore() failed"); 2074 } 2075} 2076 2077static int check_pending_signals(bool wait_for_signal) { 2078 DWORD ret; 2079 while (true) { 2080 for (int i = 0; i < NSIG + 1; i++) { 2081 jint n = pending_signals[i]; 2082 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2083 return i; 2084 } 2085 } 2086 if (!wait_for_signal) { 2087 return -1; 2088 } 2089 2090 JavaThread *thread = JavaThread::current(); 2091 2092 ThreadBlockInVM tbivm(thread); 2093 2094 bool threadIsSuspended; 2095 do { 2096 thread->set_suspend_equivalent(); 2097 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2098 ret = ::WaitForSingleObject(sig_sem, INFINITE); 2099 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 2100 2101 // were we externally suspended while we were waiting? 2102 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2103 if (threadIsSuspended) { 2104 // The semaphore has been incremented, but while we were waiting 2105 // another thread suspended us. We don't want to continue running 2106 // while suspended because that would surprise the thread that 2107 // suspended us. 2108 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2109 assert(ret != 0, "ReleaseSemaphore() failed"); 2110 2111 thread->java_suspend_self(); 2112 } 2113 } while (threadIsSuspended); 2114 } 2115} 2116 2117int os::signal_lookup() { 2118 return check_pending_signals(false); 2119} 2120 2121int os::signal_wait() { 2122 return check_pending_signals(true); 2123} 2124 2125// Implicit OS exception handling 2126 2127LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, 2128 address handler) { 2129 JavaThread* thread = (JavaThread*) Thread::current_or_null(); 2130 // Save pc in thread 2131#ifdef _M_AMD64 2132 // Do not blow up if no thread info available. 2133 if (thread) { 2134 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip); 2135 } 2136 // Set pc to handler 2137 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 2138#else 2139 // Do not blow up if no thread info available. 2140 if (thread) { 2141 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip); 2142 } 2143 // Set pc to handler 2144 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler; 2145#endif 2146 2147 // Continue the execution 2148 return EXCEPTION_CONTINUE_EXECUTION; 2149} 2150 2151 2152// Used for PostMortemDump 2153extern "C" void safepoints(); 2154extern "C" void find(int x); 2155extern "C" void events(); 2156 2157// According to Windows API documentation, an illegal instruction sequence should generate 2158// the 0xC000001C exception code. However, real world experience shows that occasionnaly 2159// the execution of an illegal instruction can generate the exception code 0xC000001E. This 2160// seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 2161 2162#define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 2163 2164// From "Execution Protection in the Windows Operating System" draft 0.35 2165// Once a system header becomes available, the "real" define should be 2166// included or copied here. 2167#define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2168 2169// Windows Vista/2008 heap corruption check 2170#define EXCEPTION_HEAP_CORRUPTION 0xC0000374 2171 2172// All Visual C++ exceptions thrown from code generated by the Microsoft Visual 2173// C++ compiler contain this error code. Because this is a compiler-generated 2174// error, the code is not listed in the Win32 API header files. 2175// The code is actually a cryptic mnemonic device, with the initial "E" 2176// standing for "exception" and the final 3 bytes (0x6D7363) representing the 2177// ASCII values of "msc". 2178 2179#define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363 2180 2181#define def_excpt(val) { #val, (val) } 2182 2183static const struct { char* name; uint number; } exceptlabels[] = { 2184 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2185 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2186 def_excpt(EXCEPTION_BREAKPOINT), 2187 def_excpt(EXCEPTION_SINGLE_STEP), 2188 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2189 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2190 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2191 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2192 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2193 def_excpt(EXCEPTION_FLT_OVERFLOW), 2194 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2195 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2196 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2197 def_excpt(EXCEPTION_INT_OVERFLOW), 2198 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2199 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2200 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2201 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2202 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2203 def_excpt(EXCEPTION_STACK_OVERFLOW), 2204 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2205 def_excpt(EXCEPTION_GUARD_PAGE), 2206 def_excpt(EXCEPTION_INVALID_HANDLE), 2207 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION), 2208 def_excpt(EXCEPTION_HEAP_CORRUPTION) 2209}; 2210 2211#undef def_excpt 2212 2213const char* os::exception_name(int exception_code, char *buf, size_t size) { 2214 uint code = static_cast<uint>(exception_code); 2215 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) { 2216 if (exceptlabels[i].number == code) { 2217 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2218 return buf; 2219 } 2220 } 2221 2222 return NULL; 2223} 2224 2225//----------------------------------------------------------------------------- 2226LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2227 // handle exception caused by idiv; should only happen for -MinInt/-1 2228 // (division by zero is handled explicitly) 2229#ifdef _M_AMD64 2230 PCONTEXT ctx = exceptionInfo->ContextRecord; 2231 address pc = (address)ctx->Rip; 2232 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode"); 2233 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2234 if (pc[0] == 0xF7) { 2235 // set correct result values and continue after idiv instruction 2236 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes 2237 } else { 2238 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes 2239 } 2240 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation) 2241 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the 2242 // idiv opcode (0xF7). 2243 ctx->Rdx = (DWORD)0; // remainder 2244 // Continue the execution 2245#else 2246 PCONTEXT ctx = exceptionInfo->ContextRecord; 2247 address pc = (address)ctx->Eip; 2248 assert(pc[0] == 0xF7, "not an idiv opcode"); 2249 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2250 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2251 // set correct result values and continue after idiv instruction 2252 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2253 ctx->Eax = (DWORD)min_jint; // result 2254 ctx->Edx = (DWORD)0; // remainder 2255 // Continue the execution 2256#endif 2257 return EXCEPTION_CONTINUE_EXECUTION; 2258} 2259 2260//----------------------------------------------------------------------------- 2261LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2262 PCONTEXT ctx = exceptionInfo->ContextRecord; 2263#ifndef _WIN64 2264 // handle exception caused by native method modifying control word 2265 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2266 2267 switch (exception_code) { 2268 case EXCEPTION_FLT_DENORMAL_OPERAND: 2269 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2270 case EXCEPTION_FLT_INEXACT_RESULT: 2271 case EXCEPTION_FLT_INVALID_OPERATION: 2272 case EXCEPTION_FLT_OVERFLOW: 2273 case EXCEPTION_FLT_STACK_CHECK: 2274 case EXCEPTION_FLT_UNDERFLOW: 2275 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2276 if (fp_control_word != ctx->FloatSave.ControlWord) { 2277 // Restore FPCW and mask out FLT exceptions 2278 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2279 // Mask out pending FLT exceptions 2280 ctx->FloatSave.StatusWord &= 0xffffff00; 2281 return EXCEPTION_CONTINUE_EXECUTION; 2282 } 2283 } 2284 2285 if (prev_uef_handler != NULL) { 2286 // We didn't handle this exception so pass it to the previous 2287 // UnhandledExceptionFilter. 2288 return (prev_uef_handler)(exceptionInfo); 2289 } 2290#else // !_WIN64 2291 // On Windows, the mxcsr control bits are non-volatile across calls 2292 // See also CR 6192333 2293 // 2294 jint MxCsr = INITIAL_MXCSR; 2295 // we can't use StubRoutines::addr_mxcsr_std() 2296 // because in Win64 mxcsr is not saved there 2297 if (MxCsr != ctx->MxCsr) { 2298 ctx->MxCsr = MxCsr; 2299 return EXCEPTION_CONTINUE_EXECUTION; 2300 } 2301#endif // !_WIN64 2302 2303 return EXCEPTION_CONTINUE_SEARCH; 2304} 2305 2306static inline void report_error(Thread* t, DWORD exception_code, 2307 address addr, void* siginfo, void* context) { 2308 VMError::report_and_die(t, exception_code, addr, siginfo, context); 2309 2310 // If UseOsErrorReporting, this will return here and save the error file 2311 // somewhere where we can find it in the minidump. 2312} 2313 2314bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread, 2315 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) { 2316 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2317 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2318 if (Interpreter::contains(pc)) { 2319 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord); 2320 if (!fr->is_first_java_frame()) { 2321 // get_frame_at_stack_banging_point() is only called when we 2322 // have well defined stacks so java_sender() calls do not need 2323 // to assert safe_for_sender() first. 2324 *fr = fr->java_sender(); 2325 } 2326 } else { 2327 // more complex code with compiled code 2328 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above"); 2329 CodeBlob* cb = CodeCache::find_blob(pc); 2330 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) { 2331 // Not sure where the pc points to, fallback to default 2332 // stack overflow handling 2333 return false; 2334 } else { 2335 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord); 2336 // in compiled code, the stack banging is performed just after the return pc 2337 // has been pushed on the stack 2338 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp())); 2339 if (!fr->is_java_frame()) { 2340 // See java_sender() comment above. 2341 *fr = fr->java_sender(); 2342 } 2343 } 2344 } 2345 assert(fr->is_java_frame(), "Safety check"); 2346 return true; 2347} 2348 2349//----------------------------------------------------------------------------- 2350LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2351 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2352 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2353#ifdef _M_AMD64 2354 address pc = (address) exceptionInfo->ContextRecord->Rip; 2355#else 2356 address pc = (address) exceptionInfo->ContextRecord->Eip; 2357#endif 2358 Thread* t = Thread::current_or_null_safe(); 2359 2360 // Handle SafeFetch32 and SafeFetchN exceptions. 2361 if (StubRoutines::is_safefetch_fault(pc)) { 2362 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc)); 2363 } 2364 2365#ifndef _WIN64 2366 // Execution protection violation - win32 running on AMD64 only 2367 // Handled first to avoid misdiagnosis as a "normal" access violation; 2368 // This is safe to do because we have a new/unique ExceptionInformation 2369 // code for this condition. 2370 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2371 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2372 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2373 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2374 2375 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2376 int page_size = os::vm_page_size(); 2377 2378 // Make sure the pc and the faulting address are sane. 2379 // 2380 // If an instruction spans a page boundary, and the page containing 2381 // the beginning of the instruction is executable but the following 2382 // page is not, the pc and the faulting address might be slightly 2383 // different - we still want to unguard the 2nd page in this case. 2384 // 2385 // 15 bytes seems to be a (very) safe value for max instruction size. 2386 bool pc_is_near_addr = 2387 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2388 bool instr_spans_page_boundary = 2389 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2390 (intptr_t) page_size) > 0); 2391 2392 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2393 static volatile address last_addr = 2394 (address) os::non_memory_address_word(); 2395 2396 // In conservative mode, don't unguard unless the address is in the VM 2397 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2398 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2399 2400 // Set memory to RWX and retry 2401 address page_start = 2402 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2403 bool res = os::protect_memory((char*) page_start, page_size, 2404 os::MEM_PROT_RWX); 2405 2406 log_debug(os)("Execution protection violation " 2407 "at " INTPTR_FORMAT 2408 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr), 2409 p2i(page_start), (res ? "success" : os::strerror(errno))); 2410 2411 // Set last_addr so if we fault again at the same address, we don't 2412 // end up in an endless loop. 2413 // 2414 // There are two potential complications here. Two threads trapping 2415 // at the same address at the same time could cause one of the 2416 // threads to think it already unguarded, and abort the VM. Likely 2417 // very rare. 2418 // 2419 // The other race involves two threads alternately trapping at 2420 // different addresses and failing to unguard the page, resulting in 2421 // an endless loop. This condition is probably even more unlikely 2422 // than the first. 2423 // 2424 // Although both cases could be avoided by using locks or thread 2425 // local last_addr, these solutions are unnecessary complication: 2426 // this handler is a best-effort safety net, not a complete solution. 2427 // It is disabled by default and should only be used as a workaround 2428 // in case we missed any no-execute-unsafe VM code. 2429 2430 last_addr = addr; 2431 2432 return EXCEPTION_CONTINUE_EXECUTION; 2433 } 2434 } 2435 2436 // Last unguard failed or not unguarding 2437 tty->print_raw_cr("Execution protection violation"); 2438 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2439 exceptionInfo->ContextRecord); 2440 return EXCEPTION_CONTINUE_SEARCH; 2441 } 2442 } 2443#endif // _WIN64 2444 2445 // Check to see if we caught the safepoint code in the 2446 // process of write protecting the memory serialization page. 2447 // It write enables the page immediately after protecting it 2448 // so just return. 2449 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2450 if (t != NULL && t->is_Java_thread()) { 2451 JavaThread* thread = (JavaThread*) t; 2452 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2453 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2454 if (os::is_memory_serialize_page(thread, addr)) { 2455 // Block current thread until the memory serialize page permission restored. 2456 os::block_on_serialize_page_trap(); 2457 return EXCEPTION_CONTINUE_EXECUTION; 2458 } 2459 } 2460 } 2461 2462 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) && 2463 VM_Version::is_cpuinfo_segv_addr(pc)) { 2464 // Verify that OS save/restore AVX registers. 2465 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr()); 2466 } 2467 2468 if (t != NULL && t->is_Java_thread()) { 2469 JavaThread* thread = (JavaThread*) t; 2470 bool in_java = thread->thread_state() == _thread_in_Java; 2471 2472 // Handle potential stack overflows up front. 2473 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2474 if (thread->stack_guards_enabled()) { 2475 if (in_java) { 2476 frame fr; 2477 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2478 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2479 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) { 2480 assert(fr.is_java_frame(), "Must be a Java frame"); 2481 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr); 2482 } 2483 } 2484 // Yellow zone violation. The o/s has unprotected the first yellow 2485 // zone page for us. Note: must call disable_stack_yellow_zone to 2486 // update the enabled status, even if the zone contains only one page. 2487 assert(thread->thread_state() != _thread_in_vm, "Undersized StackShadowPages"); 2488 thread->disable_stack_yellow_reserved_zone(); 2489 // If not in java code, return and hope for the best. 2490 return in_java 2491 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2492 : EXCEPTION_CONTINUE_EXECUTION; 2493 } else { 2494 // Fatal red zone violation. 2495 thread->disable_stack_red_zone(); 2496 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2497 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2498 exceptionInfo->ContextRecord); 2499 return EXCEPTION_CONTINUE_SEARCH; 2500 } 2501 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2502 // Either stack overflow or null pointer exception. 2503 if (in_java) { 2504 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2505 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2506 address stack_end = thread->stack_end(); 2507 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2508 // Stack overflow. 2509 assert(!os::uses_stack_guard_pages(), 2510 "should be caught by red zone code above."); 2511 return Handle_Exception(exceptionInfo, 2512 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2513 } 2514 // Check for safepoint polling and implicit null 2515 // We only expect null pointers in the stubs (vtable) 2516 // the rest are checked explicitly now. 2517 CodeBlob* cb = CodeCache::find_blob(pc); 2518 if (cb != NULL) { 2519 if (os::is_poll_address(addr)) { 2520 address stub = SharedRuntime::get_poll_stub(pc); 2521 return Handle_Exception(exceptionInfo, stub); 2522 } 2523 } 2524 { 2525#ifdef _WIN64 2526 // If it's a legal stack address map the entire region in 2527 // 2528 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2529 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2530 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) { 2531 addr = (address)((uintptr_t)addr & 2532 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2533 os::commit_memory((char *)addr, thread->stack_base() - addr, 2534 !ExecMem); 2535 return EXCEPTION_CONTINUE_EXECUTION; 2536 } else 2537#endif 2538 { 2539 // Null pointer exception. 2540 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr)) { 2541 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2542 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2543 } 2544 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2545 exceptionInfo->ContextRecord); 2546 return EXCEPTION_CONTINUE_SEARCH; 2547 } 2548 } 2549 } 2550 2551#ifdef _WIN64 2552 // Special care for fast JNI field accessors. 2553 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2554 // in and the heap gets shrunk before the field access. 2555 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2556 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2557 if (addr != (address)-1) { 2558 return Handle_Exception(exceptionInfo, addr); 2559 } 2560 } 2561#endif 2562 2563 // Stack overflow or null pointer exception in native code. 2564 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2565 exceptionInfo->ContextRecord); 2566 return EXCEPTION_CONTINUE_SEARCH; 2567 } // /EXCEPTION_ACCESS_VIOLATION 2568 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2569 2570 if (in_java) { 2571 switch (exception_code) { 2572 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2573 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2574 2575 case EXCEPTION_INT_OVERFLOW: 2576 return Handle_IDiv_Exception(exceptionInfo); 2577 2578 } // switch 2579 } 2580 if (((thread->thread_state() == _thread_in_Java) || 2581 (thread->thread_state() == _thread_in_native)) && 2582 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) { 2583 LONG result=Handle_FLT_Exception(exceptionInfo); 2584 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2585 } 2586 } 2587 2588 if (exception_code != EXCEPTION_BREAKPOINT) { 2589 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2590 exceptionInfo->ContextRecord); 2591 } 2592 return EXCEPTION_CONTINUE_SEARCH; 2593} 2594 2595#ifndef _WIN64 2596// Special care for fast JNI accessors. 2597// jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2598// the heap gets shrunk before the field access. 2599// Need to install our own structured exception handler since native code may 2600// install its own. 2601LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2602 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2603 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2604 address pc = (address) exceptionInfo->ContextRecord->Eip; 2605 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2606 if (addr != (address)-1) { 2607 return Handle_Exception(exceptionInfo, addr); 2608 } 2609 } 2610 return EXCEPTION_CONTINUE_SEARCH; 2611} 2612 2613#define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \ 2614 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \ 2615 jobject obj, \ 2616 jfieldID fieldID) { \ 2617 __try { \ 2618 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \ 2619 obj, \ 2620 fieldID); \ 2621 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \ 2622 _exception_info())) { \ 2623 } \ 2624 return 0; \ 2625 } 2626 2627DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2628DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2629DEFINE_FAST_GETFIELD(jchar, char, Char) 2630DEFINE_FAST_GETFIELD(jshort, short, Short) 2631DEFINE_FAST_GETFIELD(jint, int, Int) 2632DEFINE_FAST_GETFIELD(jlong, long, Long) 2633DEFINE_FAST_GETFIELD(jfloat, float, Float) 2634DEFINE_FAST_GETFIELD(jdouble, double, Double) 2635 2636address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2637 switch (type) { 2638 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2639 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2640 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2641 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2642 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2643 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2644 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2645 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2646 default: ShouldNotReachHere(); 2647 } 2648 return (address)-1; 2649} 2650#endif 2651 2652// Virtual Memory 2653 2654int os::vm_page_size() { return os::win32::vm_page_size(); } 2655int os::vm_allocation_granularity() { 2656 return os::win32::vm_allocation_granularity(); 2657} 2658 2659// Windows large page support is available on Windows 2003. In order to use 2660// large page memory, the administrator must first assign additional privilege 2661// to the user: 2662// + select Control Panel -> Administrative Tools -> Local Security Policy 2663// + select Local Policies -> User Rights Assignment 2664// + double click "Lock pages in memory", add users and/or groups 2665// + reboot 2666// Note the above steps are needed for administrator as well, as administrators 2667// by default do not have the privilege to lock pages in memory. 2668// 2669// Note about Windows 2003: although the API supports committing large page 2670// memory on a page-by-page basis and VirtualAlloc() returns success under this 2671// scenario, I found through experiment it only uses large page if the entire 2672// memory region is reserved and committed in a single VirtualAlloc() call. 2673// This makes Windows large page support more or less like Solaris ISM, in 2674// that the entire heap must be committed upfront. This probably will change 2675// in the future, if so the code below needs to be revisited. 2676 2677#ifndef MEM_LARGE_PAGES 2678 #define MEM_LARGE_PAGES 0x20000000 2679#endif 2680 2681static HANDLE _hProcess; 2682static HANDLE _hToken; 2683 2684// Container for NUMA node list info 2685class NUMANodeListHolder { 2686 private: 2687 int *_numa_used_node_list; // allocated below 2688 int _numa_used_node_count; 2689 2690 void free_node_list() { 2691 if (_numa_used_node_list != NULL) { 2692 FREE_C_HEAP_ARRAY(int, _numa_used_node_list); 2693 } 2694 } 2695 2696 public: 2697 NUMANodeListHolder() { 2698 _numa_used_node_count = 0; 2699 _numa_used_node_list = NULL; 2700 // do rest of initialization in build routine (after function pointers are set up) 2701 } 2702 2703 ~NUMANodeListHolder() { 2704 free_node_list(); 2705 } 2706 2707 bool build() { 2708 DWORD_PTR proc_aff_mask; 2709 DWORD_PTR sys_aff_mask; 2710 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false; 2711 ULONG highest_node_number; 2712 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false; 2713 free_node_list(); 2714 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal); 2715 for (unsigned int i = 0; i <= highest_node_number; i++) { 2716 ULONGLONG proc_mask_numa_node; 2717 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false; 2718 if ((proc_aff_mask & proc_mask_numa_node)!=0) { 2719 _numa_used_node_list[_numa_used_node_count++] = i; 2720 } 2721 } 2722 return (_numa_used_node_count > 1); 2723 } 2724 2725 int get_count() { return _numa_used_node_count; } 2726 int get_node_list_entry(int n) { 2727 // for indexes out of range, returns -1 2728 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1); 2729 } 2730 2731} numa_node_list_holder; 2732 2733 2734 2735static size_t _large_page_size = 0; 2736 2737static bool request_lock_memory_privilege() { 2738 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2739 os::current_process_id()); 2740 2741 LUID luid; 2742 if (_hProcess != NULL && 2743 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2744 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2745 2746 TOKEN_PRIVILEGES tp; 2747 tp.PrivilegeCount = 1; 2748 tp.Privileges[0].Luid = luid; 2749 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2750 2751 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2752 // privilege. Check GetLastError() too. See MSDN document. 2753 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2754 (GetLastError() == ERROR_SUCCESS)) { 2755 return true; 2756 } 2757 } 2758 2759 return false; 2760} 2761 2762static void cleanup_after_large_page_init() { 2763 if (_hProcess) CloseHandle(_hProcess); 2764 _hProcess = NULL; 2765 if (_hToken) CloseHandle(_hToken); 2766 _hToken = NULL; 2767} 2768 2769static bool numa_interleaving_init() { 2770 bool success = false; 2771 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving); 2772 2773 // print a warning if UseNUMAInterleaving flag is specified on command line 2774 bool warn_on_failure = use_numa_interleaving_specified; 2775#define WARN(msg) if (warn_on_failure) { warning(msg); } 2776 2777 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages) 2778 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2779 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity); 2780 2781 if (numa_node_list_holder.build()) { 2782 if (log_is_enabled(Debug, os, cpu)) { 2783 Log(os, cpu) log; 2784 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count()); 2785 for (int i = 0; i < numa_node_list_holder.get_count(); i++) { 2786 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i)); 2787 } 2788 } 2789 success = true; 2790 } else { 2791 WARN("Process does not cover multiple NUMA nodes."); 2792 } 2793 if (!success) { 2794 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag."); 2795 } 2796 return success; 2797#undef WARN 2798} 2799 2800// this routine is used whenever we need to reserve a contiguous VA range 2801// but we need to make separate VirtualAlloc calls for each piece of the range 2802// Reasons for doing this: 2803// * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise) 2804// * UseNUMAInterleaving requires a separate node for each piece 2805static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, 2806 DWORD prot, 2807 bool should_inject_error = false) { 2808 char * p_buf; 2809 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size 2810 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2811 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size; 2812 2813 // first reserve enough address space in advance since we want to be 2814 // able to break a single contiguous virtual address range into multiple 2815 // large page commits but WS2003 does not allow reserving large page space 2816 // so we just use 4K pages for reserve, this gives us a legal contiguous 2817 // address space. then we will deallocate that reservation, and re alloc 2818 // using large pages 2819 const size_t size_of_reserve = bytes + chunk_size; 2820 if (bytes > size_of_reserve) { 2821 // Overflowed. 2822 return NULL; 2823 } 2824 p_buf = (char *) VirtualAlloc(addr, 2825 size_of_reserve, // size of Reserve 2826 MEM_RESERVE, 2827 PAGE_READWRITE); 2828 // If reservation failed, return NULL 2829 if (p_buf == NULL) return NULL; 2830 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC); 2831 os::release_memory(p_buf, bytes + chunk_size); 2832 2833 // we still need to round up to a page boundary (in case we are using large pages) 2834 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size) 2835 // instead we handle this in the bytes_to_rq computation below 2836 p_buf = (char *) align_size_up((size_t)p_buf, page_size); 2837 2838 // now go through and allocate one chunk at a time until all bytes are 2839 // allocated 2840 size_t bytes_remaining = bytes; 2841 // An overflow of align_size_up() would have been caught above 2842 // in the calculation of size_of_reserve. 2843 char * next_alloc_addr = p_buf; 2844 HANDLE hProc = GetCurrentProcess(); 2845 2846#ifdef ASSERT 2847 // Variable for the failure injection 2848 int ran_num = os::random(); 2849 size_t fail_after = ran_num % bytes; 2850#endif 2851 2852 int count=0; 2853 while (bytes_remaining) { 2854 // select bytes_to_rq to get to the next chunk_size boundary 2855 2856 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size)); 2857 // Note allocate and commit 2858 char * p_new; 2859 2860#ifdef ASSERT 2861 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after); 2862#else 2863 const bool inject_error_now = false; 2864#endif 2865 2866 if (inject_error_now) { 2867 p_new = NULL; 2868 } else { 2869 if (!UseNUMAInterleaving) { 2870 p_new = (char *) VirtualAlloc(next_alloc_addr, 2871 bytes_to_rq, 2872 flags, 2873 prot); 2874 } else { 2875 // get the next node to use from the used_node_list 2876 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected"); 2877 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count()); 2878 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node); 2879 } 2880 } 2881 2882 if (p_new == NULL) { 2883 // Free any allocated pages 2884 if (next_alloc_addr > p_buf) { 2885 // Some memory was committed so release it. 2886 size_t bytes_to_release = bytes - bytes_remaining; 2887 // NMT has yet to record any individual blocks, so it 2888 // need to create a dummy 'reserve' record to match 2889 // the release. 2890 MemTracker::record_virtual_memory_reserve((address)p_buf, 2891 bytes_to_release, CALLER_PC); 2892 os::release_memory(p_buf, bytes_to_release); 2893 } 2894#ifdef ASSERT 2895 if (should_inject_error) { 2896 log_develop_debug(pagesize)("Reserving pages individually failed."); 2897 } 2898#endif 2899 return NULL; 2900 } 2901 2902 bytes_remaining -= bytes_to_rq; 2903 next_alloc_addr += bytes_to_rq; 2904 count++; 2905 } 2906 // Although the memory is allocated individually, it is returned as one. 2907 // NMT records it as one block. 2908 if ((flags & MEM_COMMIT) != 0) { 2909 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC); 2910 } else { 2911 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC); 2912 } 2913 2914 // made it this far, success 2915 return p_buf; 2916} 2917 2918 2919 2920void os::large_page_init() { 2921 if (!UseLargePages) return; 2922 2923 // print a warning if any large page related flag is specified on command line 2924 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2925 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2926 bool success = false; 2927 2928#define WARN(msg) if (warn_on_failure) { warning(msg); } 2929 if (request_lock_memory_privilege()) { 2930 size_t s = GetLargePageMinimum(); 2931 if (s) { 2932#if defined(IA32) || defined(AMD64) 2933 if (s > 4*M || LargePageSizeInBytes > 4*M) { 2934 WARN("JVM cannot use large pages bigger than 4mb."); 2935 } else { 2936#endif 2937 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 2938 _large_page_size = LargePageSizeInBytes; 2939 } else { 2940 _large_page_size = s; 2941 } 2942 success = true; 2943#if defined(IA32) || defined(AMD64) 2944 } 2945#endif 2946 } else { 2947 WARN("Large page is not supported by the processor."); 2948 } 2949 } else { 2950 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 2951 } 2952#undef WARN 2953 2954 const size_t default_page_size = (size_t) vm_page_size(); 2955 if (success && _large_page_size > default_page_size) { 2956 _page_sizes[0] = _large_page_size; 2957 _page_sizes[1] = default_page_size; 2958 _page_sizes[2] = 0; 2959 } 2960 2961 cleanup_after_large_page_init(); 2962 UseLargePages = success; 2963} 2964 2965// On win32, one cannot release just a part of reserved memory, it's an 2966// all or nothing deal. When we split a reservation, we must break the 2967// reservation into two reservations. 2968void os::pd_split_reserved_memory(char *base, size_t size, size_t split, 2969 bool realloc) { 2970 if (size > 0) { 2971 release_memory(base, size); 2972 if (realloc) { 2973 reserve_memory(split, base); 2974 } 2975 if (size != split) { 2976 reserve_memory(size - split, base + split); 2977 } 2978 } 2979} 2980 2981// Multiple threads can race in this code but it's not possible to unmap small sections of 2982// virtual space to get requested alignment, like posix-like os's. 2983// Windows prevents multiple thread from remapping over each other so this loop is thread-safe. 2984char* os::reserve_memory_aligned(size_t size, size_t alignment) { 2985 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 2986 "Alignment must be a multiple of allocation granularity (page size)"); 2987 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 2988 2989 size_t extra_size = size + alignment; 2990 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 2991 2992 char* aligned_base = NULL; 2993 2994 do { 2995 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 2996 if (extra_base == NULL) { 2997 return NULL; 2998 } 2999 // Do manual alignment 3000 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 3001 3002 os::release_memory(extra_base, extra_size); 3003 3004 aligned_base = os::reserve_memory(size, aligned_base); 3005 3006 } while (aligned_base == NULL); 3007 3008 return aligned_base; 3009} 3010 3011char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 3012 assert((size_t)addr % os::vm_allocation_granularity() == 0, 3013 "reserve alignment"); 3014 assert(bytes % os::vm_page_size() == 0, "reserve page size"); 3015 char* res; 3016 // note that if UseLargePages is on, all the areas that require interleaving 3017 // will go thru reserve_memory_special rather than thru here. 3018 bool use_individual = (UseNUMAInterleaving && !UseLargePages); 3019 if (!use_individual) { 3020 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 3021 } else { 3022 elapsedTimer reserveTimer; 3023 if (Verbose && PrintMiscellaneous) reserveTimer.start(); 3024 // in numa interleaving, we have to allocate pages individually 3025 // (well really chunks of NUMAInterleaveGranularity size) 3026 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE); 3027 if (res == NULL) { 3028 warning("NUMA page allocation failed"); 3029 } 3030 if (Verbose && PrintMiscellaneous) { 3031 reserveTimer.stop(); 3032 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes, 3033 reserveTimer.milliseconds(), reserveTimer.ticks()); 3034 } 3035 } 3036 assert(res == NULL || addr == NULL || addr == res, 3037 "Unexpected address from reserve."); 3038 3039 return res; 3040} 3041 3042// Reserve memory at an arbitrary address, only if that area is 3043// available (and not reserved for something else). 3044char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3045 // Windows os::reserve_memory() fails of the requested address range is 3046 // not avilable. 3047 return reserve_memory(bytes, requested_addr); 3048} 3049 3050size_t os::large_page_size() { 3051 return _large_page_size; 3052} 3053 3054bool os::can_commit_large_page_memory() { 3055 // Windows only uses large page memory when the entire region is reserved 3056 // and committed in a single VirtualAlloc() call. This may change in the 3057 // future, but with Windows 2003 it's not possible to commit on demand. 3058 return false; 3059} 3060 3061bool os::can_execute_large_page_memory() { 3062 return true; 3063} 3064 3065char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, 3066 bool exec) { 3067 assert(UseLargePages, "only for large pages"); 3068 3069 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { 3070 return NULL; // Fallback to small pages. 3071 } 3072 3073 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 3074 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3075 3076 // with large pages, there are two cases where we need to use Individual Allocation 3077 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003) 3078 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page 3079 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) { 3080 log_debug(pagesize)("Reserving large pages individually."); 3081 3082 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError); 3083 if (p_buf == NULL) { 3084 // give an appropriate warning message 3085 if (UseNUMAInterleaving) { 3086 warning("NUMA large page allocation failed, UseLargePages flag ignored"); 3087 } 3088 if (UseLargePagesIndividualAllocation) { 3089 warning("Individually allocated large pages failed, " 3090 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 3091 } 3092 return NULL; 3093 } 3094 3095 return p_buf; 3096 3097 } else { 3098 log_debug(pagesize)("Reserving large pages in a single large chunk."); 3099 3100 // normal policy just allocate it all at once 3101 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3102 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); 3103 if (res != NULL) { 3104 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC); 3105 } 3106 3107 return res; 3108 } 3109} 3110 3111bool os::release_memory_special(char* base, size_t bytes) { 3112 assert(base != NULL, "Sanity check"); 3113 return release_memory(base, bytes); 3114} 3115 3116void os::print_statistics() { 3117} 3118 3119static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) { 3120 int err = os::get_last_error(); 3121 char buf[256]; 3122 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3123 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 3124 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3125 exec, buf_len != 0 ? buf : "<no_error_string>", err); 3126} 3127 3128bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 3129 if (bytes == 0) { 3130 // Don't bother the OS with noops. 3131 return true; 3132 } 3133 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 3134 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 3135 // Don't attempt to print anything if the OS call fails. We're 3136 // probably low on resources, so the print itself may cause crashes. 3137 3138 // unless we have NUMAInterleaving enabled, the range of a commit 3139 // is always within a reserve covered by a single VirtualAlloc 3140 // in that case we can just do a single commit for the requested size 3141 if (!UseNUMAInterleaving) { 3142 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) { 3143 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3144 return false; 3145 } 3146 if (exec) { 3147 DWORD oldprot; 3148 // Windows doc says to use VirtualProtect to get execute permissions 3149 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) { 3150 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3151 return false; 3152 } 3153 } 3154 return true; 3155 } else { 3156 3157 // when NUMAInterleaving is enabled, the commit might cover a range that 3158 // came from multiple VirtualAlloc reserves (using allocate_pages_individually). 3159 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery 3160 // returns represents the number of bytes that can be committed in one step. 3161 size_t bytes_remaining = bytes; 3162 char * next_alloc_addr = addr; 3163 while (bytes_remaining > 0) { 3164 MEMORY_BASIC_INFORMATION alloc_info; 3165 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info)); 3166 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3167 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, 3168 PAGE_READWRITE) == NULL) { 3169 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3170 exec);) 3171 return false; 3172 } 3173 if (exec) { 3174 DWORD oldprot; 3175 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, 3176 PAGE_EXECUTE_READWRITE, &oldprot)) { 3177 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3178 exec);) 3179 return false; 3180 } 3181 } 3182 bytes_remaining -= bytes_to_rq; 3183 next_alloc_addr += bytes_to_rq; 3184 } 3185 } 3186 // if we made it this far, return true 3187 return true; 3188} 3189 3190bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 3191 bool exec) { 3192 // alignment_hint is ignored on this OS 3193 return pd_commit_memory(addr, size, exec); 3194} 3195 3196void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 3197 const char* mesg) { 3198 assert(mesg != NULL, "mesg must be specified"); 3199 if (!pd_commit_memory(addr, size, exec)) { 3200 warn_fail_commit_memory(addr, size, exec); 3201 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 3202 } 3203} 3204 3205void os::pd_commit_memory_or_exit(char* addr, size_t size, 3206 size_t alignment_hint, bool exec, 3207 const char* mesg) { 3208 // alignment_hint is ignored on this OS 3209 pd_commit_memory_or_exit(addr, size, exec, mesg); 3210} 3211 3212bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3213 if (bytes == 0) { 3214 // Don't bother the OS with noops. 3215 return true; 3216 } 3217 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 3218 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 3219 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0); 3220} 3221 3222bool os::pd_release_memory(char* addr, size_t bytes) { 3223 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 3224} 3225 3226bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 3227 return os::commit_memory(addr, size, !ExecMem); 3228} 3229 3230bool os::remove_stack_guard_pages(char* addr, size_t size) { 3231 return os::uncommit_memory(addr, size); 3232} 3233 3234static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) { 3235 uint count = 0; 3236 bool ret = false; 3237 size_t bytes_remaining = bytes; 3238 char * next_protect_addr = addr; 3239 3240 // Use VirtualQuery() to get the chunk size. 3241 while (bytes_remaining) { 3242 MEMORY_BASIC_INFORMATION alloc_info; 3243 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) { 3244 return false; 3245 } 3246 3247 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3248 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving, 3249 // but we don't distinguish here as both cases are protected by same API. 3250 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0; 3251 warning("Failed protecting pages individually for chunk #%u", count); 3252 if (!ret) { 3253 return false; 3254 } 3255 3256 bytes_remaining -= bytes_to_protect; 3257 next_protect_addr += bytes_to_protect; 3258 count++; 3259 } 3260 return ret; 3261} 3262 3263// Set protections specified 3264bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3265 bool is_committed) { 3266 unsigned int p = 0; 3267 switch (prot) { 3268 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 3269 case MEM_PROT_READ: p = PAGE_READONLY; break; 3270 case MEM_PROT_RW: p = PAGE_READWRITE; break; 3271 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 3272 default: 3273 ShouldNotReachHere(); 3274 } 3275 3276 DWORD old_status; 3277 3278 // Strange enough, but on Win32 one can change protection only for committed 3279 // memory, not a big deal anyway, as bytes less or equal than 64K 3280 if (!is_committed) { 3281 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX, 3282 "cannot commit protection page"); 3283 } 3284 // One cannot use os::guard_memory() here, as on Win32 guard page 3285 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 3286 // 3287 // Pages in the region become guard pages. Any attempt to access a guard page 3288 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 3289 // the guard page status. Guard pages thus act as a one-time access alarm. 3290 bool ret; 3291 if (UseNUMAInterleaving) { 3292 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time, 3293 // so we must protect the chunks individually. 3294 ret = protect_pages_individually(addr, bytes, p, &old_status); 3295 } else { 3296 ret = VirtualProtect(addr, bytes, p, &old_status) != 0; 3297 } 3298#ifdef ASSERT 3299 if (!ret) { 3300 int err = os::get_last_error(); 3301 char buf[256]; 3302 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3303 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT 3304 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3305 buf_len != 0 ? buf : "<no_error_string>", err); 3306 } 3307#endif 3308 return ret; 3309} 3310 3311bool os::guard_memory(char* addr, size_t bytes) { 3312 DWORD old_status; 3313 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 3314} 3315 3316bool os::unguard_memory(char* addr, size_t bytes) { 3317 DWORD old_status; 3318 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 3319} 3320 3321void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3322void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3323void os::numa_make_global(char *addr, size_t bytes) { } 3324void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 3325bool os::numa_topology_changed() { return false; } 3326size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); } 3327int os::numa_get_group_id() { return 0; } 3328size_t os::numa_get_leaf_groups(int *ids, size_t size) { 3329 if (numa_node_list_holder.get_count() == 0 && size > 0) { 3330 // Provide an answer for UMA systems 3331 ids[0] = 0; 3332 return 1; 3333 } else { 3334 // check for size bigger than actual groups_num 3335 size = MIN2(size, numa_get_groups_num()); 3336 for (int i = 0; i < (int)size; i++) { 3337 ids[i] = numa_node_list_holder.get_node_list_entry(i); 3338 } 3339 return size; 3340 } 3341} 3342 3343bool os::get_page_info(char *start, page_info* info) { 3344 return false; 3345} 3346 3347char *os::scan_pages(char *start, char* end, page_info* page_expected, 3348 page_info* page_found) { 3349 return end; 3350} 3351 3352char* os::non_memory_address_word() { 3353 // Must never look like an address returned by reserve_memory, 3354 // even in its subfields (as defined by the CPU immediate fields, 3355 // if the CPU splits constants across multiple instructions). 3356 return (char*)-1; 3357} 3358 3359#define MAX_ERROR_COUNT 100 3360#define SYS_THREAD_ERROR 0xffffffffUL 3361 3362void os::pd_start_thread(Thread* thread) { 3363 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 3364 // Returns previous suspend state: 3365 // 0: Thread was not suspended 3366 // 1: Thread is running now 3367 // >1: Thread is still suspended. 3368 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3369} 3370 3371class HighResolutionInterval : public CHeapObj<mtThread> { 3372 // The default timer resolution seems to be 10 milliseconds. 3373 // (Where is this written down?) 3374 // If someone wants to sleep for only a fraction of the default, 3375 // then we set the timer resolution down to 1 millisecond for 3376 // the duration of their interval. 3377 // We carefully set the resolution back, since otherwise we 3378 // seem to incur an overhead (3%?) that we don't need. 3379 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 3380 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 3381 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 3382 // timeBeginPeriod() if the relative error exceeded some threshold. 3383 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 3384 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 3385 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 3386 // resolution timers running. 3387 private: 3388 jlong resolution; 3389 public: 3390 HighResolutionInterval(jlong ms) { 3391 resolution = ms % 10L; 3392 if (resolution != 0) { 3393 MMRESULT result = timeBeginPeriod(1L); 3394 } 3395 } 3396 ~HighResolutionInterval() { 3397 if (resolution != 0) { 3398 MMRESULT result = timeEndPeriod(1L); 3399 } 3400 resolution = 0L; 3401 } 3402}; 3403 3404int os::sleep(Thread* thread, jlong ms, bool interruptable) { 3405 jlong limit = (jlong) MAXDWORD; 3406 3407 while (ms > limit) { 3408 int res; 3409 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) { 3410 return res; 3411 } 3412 ms -= limit; 3413 } 3414 3415 assert(thread == Thread::current(), "thread consistency check"); 3416 OSThread* osthread = thread->osthread(); 3417 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 3418 int result; 3419 if (interruptable) { 3420 assert(thread->is_Java_thread(), "must be java thread"); 3421 JavaThread *jt = (JavaThread *) thread; 3422 ThreadBlockInVM tbivm(jt); 3423 3424 jt->set_suspend_equivalent(); 3425 // cleared by handle_special_suspend_equivalent_condition() or 3426 // java_suspend_self() via check_and_wait_while_suspended() 3427 3428 HANDLE events[1]; 3429 events[0] = osthread->interrupt_event(); 3430 HighResolutionInterval *phri=NULL; 3431 if (!ForceTimeHighResolution) { 3432 phri = new HighResolutionInterval(ms); 3433 } 3434 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 3435 result = OS_TIMEOUT; 3436 } else { 3437 ResetEvent(osthread->interrupt_event()); 3438 osthread->set_interrupted(false); 3439 result = OS_INTRPT; 3440 } 3441 delete phri; //if it is NULL, harmless 3442 3443 // were we externally suspended while we were waiting? 3444 jt->check_and_wait_while_suspended(); 3445 } else { 3446 assert(!thread->is_Java_thread(), "must not be java thread"); 3447 Sleep((long) ms); 3448 result = OS_TIMEOUT; 3449 } 3450 return result; 3451} 3452 3453// Short sleep, direct OS call. 3454// 3455// ms = 0, means allow others (if any) to run. 3456// 3457void os::naked_short_sleep(jlong ms) { 3458 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3459 Sleep(ms); 3460} 3461 3462// Sleep forever; naked call to OS-specific sleep; use with CAUTION 3463void os::infinite_sleep() { 3464 while (true) { // sleep forever ... 3465 Sleep(100000); // ... 100 seconds at a time 3466 } 3467} 3468 3469typedef BOOL (WINAPI * STTSignature)(void); 3470 3471void os::naked_yield() { 3472 // Consider passing back the return value from SwitchToThread(). 3473 SwitchToThread(); 3474} 3475 3476// Win32 only gives you access to seven real priorities at a time, 3477// so we compress Java's ten down to seven. It would be better 3478// if we dynamically adjusted relative priorities. 3479 3480int os::java_to_os_priority[CriticalPriority + 1] = { 3481 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3482 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3483 THREAD_PRIORITY_LOWEST, // 2 3484 THREAD_PRIORITY_BELOW_NORMAL, // 3 3485 THREAD_PRIORITY_BELOW_NORMAL, // 4 3486 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3487 THREAD_PRIORITY_NORMAL, // 6 3488 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3489 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3490 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3491 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority 3492 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority 3493}; 3494 3495int prio_policy1[CriticalPriority + 1] = { 3496 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3497 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3498 THREAD_PRIORITY_LOWEST, // 2 3499 THREAD_PRIORITY_BELOW_NORMAL, // 3 3500 THREAD_PRIORITY_BELOW_NORMAL, // 4 3501 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3502 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3503 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3504 THREAD_PRIORITY_HIGHEST, // 8 3505 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3506 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority 3507 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority 3508}; 3509 3510static int prio_init() { 3511 // If ThreadPriorityPolicy is 1, switch tables 3512 if (ThreadPriorityPolicy == 1) { 3513 int i; 3514 for (i = 0; i < CriticalPriority + 1; i++) { 3515 os::java_to_os_priority[i] = prio_policy1[i]; 3516 } 3517 } 3518 if (UseCriticalJavaThreadPriority) { 3519 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 3520 } 3521 return 0; 3522} 3523 3524OSReturn os::set_native_priority(Thread* thread, int priority) { 3525 if (!UseThreadPriorities) return OS_OK; 3526 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3527 return ret ? OS_OK : OS_ERR; 3528} 3529 3530OSReturn os::get_native_priority(const Thread* const thread, 3531 int* priority_ptr) { 3532 if (!UseThreadPriorities) { 3533 *priority_ptr = java_to_os_priority[NormPriority]; 3534 return OS_OK; 3535 } 3536 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3537 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3538 assert(false, "GetThreadPriority failed"); 3539 return OS_ERR; 3540 } 3541 *priority_ptr = os_prio; 3542 return OS_OK; 3543} 3544 3545 3546// Hint to the underlying OS that a task switch would not be good. 3547// Void return because it's a hint and can fail. 3548void os::hint_no_preempt() {} 3549 3550void os::interrupt(Thread* thread) { 3551 assert(!thread->is_Java_thread() || Thread::current() == thread || 3552 Threads_lock->owned_by_self(), 3553 "possibility of dangling Thread pointer"); 3554 3555 OSThread* osthread = thread->osthread(); 3556 osthread->set_interrupted(true); 3557 // More than one thread can get here with the same value of osthread, 3558 // resulting in multiple notifications. We do, however, want the store 3559 // to interrupted() to be visible to other threads before we post 3560 // the interrupt event. 3561 OrderAccess::release(); 3562 SetEvent(osthread->interrupt_event()); 3563 // For JSR166: unpark after setting status 3564 if (thread->is_Java_thread()) { 3565 ((JavaThread*)thread)->parker()->unpark(); 3566 } 3567 3568 ParkEvent * ev = thread->_ParkEvent; 3569 if (ev != NULL) ev->unpark(); 3570} 3571 3572 3573bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3574 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3575 "possibility of dangling Thread pointer"); 3576 3577 OSThread* osthread = thread->osthread(); 3578 // There is no synchronization between the setting of the interrupt 3579 // and it being cleared here. It is critical - see 6535709 - that 3580 // we only clear the interrupt state, and reset the interrupt event, 3581 // if we are going to report that we were indeed interrupted - else 3582 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups 3583 // depending on the timing. By checking thread interrupt event to see 3584 // if the thread gets real interrupt thus prevent spurious wakeup. 3585 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0); 3586 if (interrupted && clear_interrupted) { 3587 osthread->set_interrupted(false); 3588 ResetEvent(osthread->interrupt_event()); 3589 } // Otherwise leave the interrupted state alone 3590 3591 return interrupted; 3592} 3593 3594// Get's a pc (hint) for a running thread. Currently used only for profiling. 3595ExtendedPC os::get_thread_pc(Thread* thread) { 3596 CONTEXT context; 3597 context.ContextFlags = CONTEXT_CONTROL; 3598 HANDLE handle = thread->osthread()->thread_handle(); 3599 if (GetThreadContext(handle, &context)) { 3600#ifdef _M_AMD64 3601 return ExtendedPC((address) context.Rip); 3602#else 3603 return ExtendedPC((address) context.Eip); 3604#endif 3605 } else { 3606 return ExtendedPC(NULL); 3607 } 3608} 3609 3610// GetCurrentThreadId() returns DWORD 3611intx os::current_thread_id() { return GetCurrentThreadId(); } 3612 3613static int _initial_pid = 0; 3614 3615int os::current_process_id() { 3616 return (_initial_pid ? _initial_pid : _getpid()); 3617} 3618 3619int os::win32::_vm_page_size = 0; 3620int os::win32::_vm_allocation_granularity = 0; 3621int os::win32::_processor_type = 0; 3622// Processor level is not available on non-NT systems, use vm_version instead 3623int os::win32::_processor_level = 0; 3624julong os::win32::_physical_memory = 0; 3625size_t os::win32::_default_stack_size = 0; 3626 3627intx os::win32::_os_thread_limit = 0; 3628volatile intx os::win32::_os_thread_count = 0; 3629 3630bool os::win32::_is_windows_server = false; 3631 3632// 6573254 3633// Currently, the bug is observed across all the supported Windows releases, 3634// including the latest one (as of this writing - Windows Server 2012 R2) 3635bool os::win32::_has_exit_bug = true; 3636 3637void os::win32::initialize_system_info() { 3638 SYSTEM_INFO si; 3639 GetSystemInfo(&si); 3640 _vm_page_size = si.dwPageSize; 3641 _vm_allocation_granularity = si.dwAllocationGranularity; 3642 _processor_type = si.dwProcessorType; 3643 _processor_level = si.wProcessorLevel; 3644 set_processor_count(si.dwNumberOfProcessors); 3645 3646 MEMORYSTATUSEX ms; 3647 ms.dwLength = sizeof(ms); 3648 3649 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3650 // dwMemoryLoad (% of memory in use) 3651 GlobalMemoryStatusEx(&ms); 3652 _physical_memory = ms.ullTotalPhys; 3653 3654 if (FLAG_IS_DEFAULT(MaxRAM)) { 3655 // Adjust MaxRAM according to the maximum virtual address space available. 3656 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual)); 3657 } 3658 3659 OSVERSIONINFOEX oi; 3660 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 3661 GetVersionEx((OSVERSIONINFO*)&oi); 3662 switch (oi.dwPlatformId) { 3663 case VER_PLATFORM_WIN32_NT: 3664 { 3665 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3666 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER || 3667 oi.wProductType == VER_NT_SERVER) { 3668 _is_windows_server = true; 3669 } 3670 } 3671 break; 3672 default: fatal("Unknown platform"); 3673 } 3674 3675 _default_stack_size = os::current_stack_size(); 3676 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3677 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3678 "stack size not a multiple of page size"); 3679 3680 initialize_performance_counter(); 3681} 3682 3683 3684HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, 3685 int ebuflen) { 3686 char path[MAX_PATH]; 3687 DWORD size; 3688 DWORD pathLen = (DWORD)sizeof(path); 3689 HINSTANCE result = NULL; 3690 3691 // only allow library name without path component 3692 assert(strchr(name, '\\') == NULL, "path not allowed"); 3693 assert(strchr(name, ':') == NULL, "path not allowed"); 3694 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) { 3695 jio_snprintf(ebuf, ebuflen, 3696 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name); 3697 return NULL; 3698 } 3699 3700 // search system directory 3701 if ((size = GetSystemDirectory(path, pathLen)) > 0) { 3702 if (size >= pathLen) { 3703 return NULL; // truncated 3704 } 3705 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3706 return NULL; // truncated 3707 } 3708 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3709 return result; 3710 } 3711 } 3712 3713 // try Windows directory 3714 if ((size = GetWindowsDirectory(path, pathLen)) > 0) { 3715 if (size >= pathLen) { 3716 return NULL; // truncated 3717 } 3718 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3719 return NULL; // truncated 3720 } 3721 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3722 return result; 3723 } 3724 } 3725 3726 jio_snprintf(ebuf, ebuflen, 3727 "os::win32::load_windows_dll() cannot load %s from system directories.", name); 3728 return NULL; 3729} 3730 3731#define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS) 3732#define EXIT_TIMEOUT 300000 /* 5 minutes */ 3733 3734static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) { 3735 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect); 3736 return TRUE; 3737} 3738 3739int os::win32::exit_process_or_thread(Ept what, int exit_code) { 3740 // Basic approach: 3741 // - Each exiting thread registers its intent to exit and then does so. 3742 // - A thread trying to terminate the process must wait for all 3743 // threads currently exiting to complete their exit. 3744 3745 if (os::win32::has_exit_bug()) { 3746 // The array holds handles of the threads that have started exiting by calling 3747 // _endthreadex(). 3748 // Should be large enough to avoid blocking the exiting thread due to lack of 3749 // a free slot. 3750 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP]; 3751 static int handle_count = 0; 3752 3753 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT; 3754 static CRITICAL_SECTION crit_sect; 3755 static volatile jint process_exiting = 0; 3756 int i, j; 3757 DWORD res; 3758 HANDLE hproc, hthr; 3759 3760 // We only attempt to register threads until a process exiting 3761 // thread manages to set the process_exiting flag. Any threads 3762 // that come through here after the process_exiting flag is set 3763 // are unregistered and will be caught in the SuspendThread() 3764 // infinite loop below. 3765 bool registered = false; 3766 3767 // The first thread that reached this point, initializes the critical section. 3768 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) { 3769 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__); 3770 } else if (OrderAccess::load_acquire(&process_exiting) == 0) { 3771 if (what != EPT_THREAD) { 3772 // Atomically set process_exiting before the critical section 3773 // to increase the visibility between racing threads. 3774 Atomic::cmpxchg((jint)GetCurrentThreadId(), &process_exiting, 0); 3775 } 3776 EnterCriticalSection(&crit_sect); 3777 3778 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) { 3779 // Remove from the array those handles of the threads that have completed exiting. 3780 for (i = 0, j = 0; i < handle_count; ++i) { 3781 res = WaitForSingleObject(handles[i], 0 /* don't wait */); 3782 if (res == WAIT_TIMEOUT) { 3783 handles[j++] = handles[i]; 3784 } else { 3785 if (res == WAIT_FAILED) { 3786 warning("WaitForSingleObject failed (%u) in %s: %d\n", 3787 GetLastError(), __FILE__, __LINE__); 3788 } 3789 // Don't keep the handle, if we failed waiting for it. 3790 CloseHandle(handles[i]); 3791 } 3792 } 3793 3794 // If there's no free slot in the array of the kept handles, we'll have to 3795 // wait until at least one thread completes exiting. 3796 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) { 3797 // Raise the priority of the oldest exiting thread to increase its chances 3798 // to complete sooner. 3799 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL); 3800 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT); 3801 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) { 3802 i = (res - WAIT_OBJECT_0); 3803 handle_count = MAXIMUM_THREADS_TO_KEEP - 1; 3804 for (; i < handle_count; ++i) { 3805 handles[i] = handles[i + 1]; 3806 } 3807 } else { 3808 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3809 (res == WAIT_FAILED ? "failed" : "timed out"), 3810 GetLastError(), __FILE__, __LINE__); 3811 // Don't keep handles, if we failed waiting for them. 3812 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) { 3813 CloseHandle(handles[i]); 3814 } 3815 handle_count = 0; 3816 } 3817 } 3818 3819 // Store a duplicate of the current thread handle in the array of handles. 3820 hproc = GetCurrentProcess(); 3821 hthr = GetCurrentThread(); 3822 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count], 3823 0, FALSE, DUPLICATE_SAME_ACCESS)) { 3824 warning("DuplicateHandle failed (%u) in %s: %d\n", 3825 GetLastError(), __FILE__, __LINE__); 3826 3827 // We can't register this thread (no more handles) so this thread 3828 // may be racing with a thread that is calling exit(). If the thread 3829 // that is calling exit() has managed to set the process_exiting 3830 // flag, then this thread will be caught in the SuspendThread() 3831 // infinite loop below which closes that race. A small timing 3832 // window remains before the process_exiting flag is set, but it 3833 // is only exposed when we are out of handles. 3834 } else { 3835 ++handle_count; 3836 registered = true; 3837 3838 // The current exiting thread has stored its handle in the array, and now 3839 // should leave the critical section before calling _endthreadex(). 3840 } 3841 3842 } else if (what != EPT_THREAD && handle_count > 0) { 3843 jlong start_time, finish_time, timeout_left; 3844 // Before ending the process, make sure all the threads that had called 3845 // _endthreadex() completed. 3846 3847 // Set the priority level of the current thread to the same value as 3848 // the priority level of exiting threads. 3849 // This is to ensure it will be given a fair chance to execute if 3850 // the timeout expires. 3851 hthr = GetCurrentThread(); 3852 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL); 3853 start_time = os::javaTimeNanos(); 3854 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L); 3855 for (i = 0; ; ) { 3856 int portion_count = handle_count - i; 3857 if (portion_count > MAXIMUM_WAIT_OBJECTS) { 3858 portion_count = MAXIMUM_WAIT_OBJECTS; 3859 } 3860 for (j = 0; j < portion_count; ++j) { 3861 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL); 3862 } 3863 timeout_left = (finish_time - start_time) / 1000000L; 3864 if (timeout_left < 0) { 3865 timeout_left = 0; 3866 } 3867 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left); 3868 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) { 3869 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3870 (res == WAIT_FAILED ? "failed" : "timed out"), 3871 GetLastError(), __FILE__, __LINE__); 3872 // Reset portion_count so we close the remaining 3873 // handles due to this error. 3874 portion_count = handle_count - i; 3875 } 3876 for (j = 0; j < portion_count; ++j) { 3877 CloseHandle(handles[i + j]); 3878 } 3879 if ((i += portion_count) >= handle_count) { 3880 break; 3881 } 3882 start_time = os::javaTimeNanos(); 3883 } 3884 handle_count = 0; 3885 } 3886 3887 LeaveCriticalSection(&crit_sect); 3888 } 3889 3890 if (!registered && 3891 OrderAccess::load_acquire(&process_exiting) != 0 && 3892 process_exiting != (jint)GetCurrentThreadId()) { 3893 // Some other thread is about to call exit(), so we don't let 3894 // the current unregistered thread proceed to exit() or _endthreadex() 3895 while (true) { 3896 SuspendThread(GetCurrentThread()); 3897 // Avoid busy-wait loop, if SuspendThread() failed. 3898 Sleep(EXIT_TIMEOUT); 3899 } 3900 } 3901 } 3902 3903 // We are here if either 3904 // - there's no 'race at exit' bug on this OS release; 3905 // - initialization of the critical section failed (unlikely); 3906 // - the current thread has registered itself and left the critical section; 3907 // - the process-exiting thread has raised the flag and left the critical section. 3908 if (what == EPT_THREAD) { 3909 _endthreadex((unsigned)exit_code); 3910 } else if (what == EPT_PROCESS) { 3911 ::exit(exit_code); 3912 } else { 3913 _exit(exit_code); 3914 } 3915 3916 // Should not reach here 3917 return exit_code; 3918} 3919 3920#undef EXIT_TIMEOUT 3921 3922void os::win32::setmode_streams() { 3923 _setmode(_fileno(stdin), _O_BINARY); 3924 _setmode(_fileno(stdout), _O_BINARY); 3925 _setmode(_fileno(stderr), _O_BINARY); 3926} 3927 3928 3929bool os::is_debugger_attached() { 3930 return IsDebuggerPresent() ? true : false; 3931} 3932 3933 3934void os::wait_for_keypress_at_exit(void) { 3935 if (PauseAtExit) { 3936 fprintf(stderr, "Press any key to continue...\n"); 3937 fgetc(stdin); 3938 } 3939} 3940 3941 3942bool os::message_box(const char* title, const char* message) { 3943 int result = MessageBox(NULL, message, title, 3944 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 3945 return result == IDYES; 3946} 3947 3948#ifndef PRODUCT 3949#ifndef _WIN64 3950// Helpers to check whether NX protection is enabled 3951int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 3952 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 3953 pex->ExceptionRecord->NumberParameters > 0 && 3954 pex->ExceptionRecord->ExceptionInformation[0] == 3955 EXCEPTION_INFO_EXEC_VIOLATION) { 3956 return EXCEPTION_EXECUTE_HANDLER; 3957 } 3958 return EXCEPTION_CONTINUE_SEARCH; 3959} 3960 3961void nx_check_protection() { 3962 // If NX is enabled we'll get an exception calling into code on the stack 3963 char code[] = { (char)0xC3 }; // ret 3964 void *code_ptr = (void *)code; 3965 __try { 3966 __asm call code_ptr 3967 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 3968 tty->print_raw_cr("NX protection detected."); 3969 } 3970} 3971#endif // _WIN64 3972#endif // PRODUCT 3973 3974// This is called _before_ the global arguments have been parsed 3975void os::init(void) { 3976 _initial_pid = _getpid(); 3977 3978 init_random(1234567); 3979 3980 win32::initialize_system_info(); 3981 win32::setmode_streams(); 3982 init_page_sizes((size_t) win32::vm_page_size()); 3983 3984 // This may be overridden later when argument processing is done. 3985 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, false); 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 // initialize fast thread access - only used for 32-bit 3996 win32::initialize_thread_ptr_offset(); 3997} 3998 3999// To install functions for atexit processing 4000extern "C" { 4001 static void perfMemory_exit_helper() { 4002 perfMemory_exit(); 4003 } 4004} 4005 4006static jint initSock(); 4007 4008// this is called _after_ the global arguments have been parsed 4009jint os::init_2(void) { 4010 // Allocate a single page and mark it as readable for safepoint polling 4011 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 4012 guarantee(polling_page != NULL, "Reserve Failed for polling page"); 4013 4014 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 4015 guarantee(return_page != NULL, "Commit Failed for polling page"); 4016 4017 os::set_polling_page(polling_page); 4018 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page)); 4019 4020 if (!UseMembar) { 4021 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE); 4022 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 4023 4024 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE); 4025 guarantee(return_page != NULL, "Commit Failed for memory serialize page"); 4026 4027 os::set_memory_serialize_page(mem_serialize_page); 4028 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page)); 4029 } 4030 4031 // Setup Windows Exceptions 4032 4033 // for debugging float code generation bugs 4034 if (ForceFloatExceptions) { 4035#ifndef _WIN64 4036 static long fp_control_word = 0; 4037 __asm { fstcw fp_control_word } 4038 // see Intel PPro Manual, Vol. 2, p 7-16 4039 const long precision = 0x20; 4040 const long underflow = 0x10; 4041 const long overflow = 0x08; 4042 const long zero_div = 0x04; 4043 const long denorm = 0x02; 4044 const long invalid = 0x01; 4045 fp_control_word |= invalid; 4046 __asm { fldcw fp_control_word } 4047#endif 4048 } 4049 4050 // If stack_commit_size is 0, windows will reserve the default size, 4051 // but only commit a small portion of it. 4052 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 4053 size_t default_reserve_size = os::win32::default_stack_size(); 4054 size_t actual_reserve_size = stack_commit_size; 4055 if (stack_commit_size < default_reserve_size) { 4056 // If stack_commit_size == 0, we want this too 4057 actual_reserve_size = default_reserve_size; 4058 } 4059 4060 // Check minimum allowable stack size for thread creation and to initialize 4061 // the java system classes, including StackOverflowError - depends on page 4062 // size. Add two 4K pages for compiler2 recursion in main thread. 4063 // Add in 4*BytesPerWord 4K pages to account for VM stack during 4064 // class initialization depending on 32 or 64 bit VM. 4065 size_t min_stack_allowed = 4066 (size_t)(JavaThread::stack_guard_zone_size() + 4067 JavaThread::stack_shadow_zone_size() + 4068 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K); 4069 4070 min_stack_allowed = align_size_up(min_stack_allowed, os::vm_page_size()); 4071 4072 if (actual_reserve_size < min_stack_allowed) { 4073 tty->print_cr("\nThe Java thread stack size specified is too small. " 4074 "Specify at least %dk", 4075 min_stack_allowed / K); 4076 return JNI_ERR; 4077 } 4078 4079 JavaThread::set_stack_size_at_create(stack_commit_size); 4080 4081 // Calculate theoretical max. size of Threads to guard gainst artifical 4082 // out-of-memory situations, where all available address-space has been 4083 // reserved by thread stacks. 4084 assert(actual_reserve_size != 0, "Must have a stack"); 4085 4086 // Calculate the thread limit when we should start doing Virtual Memory 4087 // banging. Currently when the threads will have used all but 200Mb of space. 4088 // 4089 // TODO: consider performing a similar calculation for commit size instead 4090 // as reserve size, since on a 64-bit platform we'll run into that more 4091 // often than running out of virtual memory space. We can use the 4092 // lower value of the two calculations as the os_thread_limit. 4093 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 4094 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 4095 4096 // at exit methods are called in the reverse order of their registration. 4097 // there is no limit to the number of functions registered. atexit does 4098 // not set errno. 4099 4100 if (PerfAllowAtExitRegistration) { 4101 // only register atexit functions if PerfAllowAtExitRegistration is set. 4102 // atexit functions can be delayed until process exit time, which 4103 // can be problematic for embedded VM situations. Embedded VMs should 4104 // call DestroyJavaVM() to assure that VM resources are released. 4105 4106 // note: perfMemory_exit_helper atexit function may be removed in 4107 // the future if the appropriate cleanup code can be added to the 4108 // VM_Exit VMOperation's doit method. 4109 if (atexit(perfMemory_exit_helper) != 0) { 4110 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 4111 } 4112 } 4113 4114#ifndef _WIN64 4115 // Print something if NX is enabled (win32 on AMD64) 4116 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 4117#endif 4118 4119 // initialize thread priority policy 4120 prio_init(); 4121 4122 if (UseNUMA && !ForceNUMA) { 4123 UseNUMA = false; // We don't fully support this yet 4124 } 4125 4126 if (UseNUMAInterleaving) { 4127 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag 4128 bool success = numa_interleaving_init(); 4129 if (!success) UseNUMAInterleaving = false; 4130 } 4131 4132 if (initSock() != JNI_OK) { 4133 return JNI_ERR; 4134 } 4135 4136 return JNI_OK; 4137} 4138 4139// Mark the polling page as unreadable 4140void os::make_polling_page_unreadable(void) { 4141 DWORD old_status; 4142 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4143 PAGE_NOACCESS, &old_status)) { 4144 fatal("Could not disable polling page"); 4145 } 4146} 4147 4148// Mark the polling page as readable 4149void os::make_polling_page_readable(void) { 4150 DWORD old_status; 4151 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4152 PAGE_READONLY, &old_status)) { 4153 fatal("Could not enable polling page"); 4154 } 4155} 4156 4157 4158int os::stat(const char *path, struct stat *sbuf) { 4159 char pathbuf[MAX_PATH]; 4160 if (strlen(path) > MAX_PATH - 1) { 4161 errno = ENAMETOOLONG; 4162 return -1; 4163 } 4164 os::native_path(strcpy(pathbuf, path)); 4165 int ret = ::stat(pathbuf, sbuf); 4166 if (sbuf != NULL && UseUTCFileTimestamp) { 4167 // Fix for 6539723. st_mtime returned from stat() is dependent on 4168 // the system timezone and so can return different values for the 4169 // same file if/when daylight savings time changes. This adjustment 4170 // makes sure the same timestamp is returned regardless of the TZ. 4171 // 4172 // See: 4173 // http://msdn.microsoft.com/library/ 4174 // default.asp?url=/library/en-us/sysinfo/base/ 4175 // time_zone_information_str.asp 4176 // and 4177 // http://msdn.microsoft.com/library/default.asp?url= 4178 // /library/en-us/sysinfo/base/settimezoneinformation.asp 4179 // 4180 // NOTE: there is a insidious bug here: If the timezone is changed 4181 // after the call to stat() but before 'GetTimeZoneInformation()', then 4182 // the adjustment we do here will be wrong and we'll return the wrong 4183 // value (which will likely end up creating an invalid class data 4184 // archive). Absent a better API for this, or some time zone locking 4185 // mechanism, we'll have to live with this risk. 4186 TIME_ZONE_INFORMATION tz; 4187 DWORD tzid = GetTimeZoneInformation(&tz); 4188 int daylightBias = 4189 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 4190 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 4191 } 4192 return ret; 4193} 4194 4195 4196#define FT2INT64(ft) \ 4197 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 4198 4199 4200// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4201// are used by JVM M&M and JVMTI to get user+sys or user CPU time 4202// of a thread. 4203// 4204// current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4205// the fast estimate available on the platform. 4206 4207// current_thread_cpu_time() is not optimized for Windows yet 4208jlong os::current_thread_cpu_time() { 4209 // return user + sys since the cost is the same 4210 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 4211} 4212 4213jlong os::thread_cpu_time(Thread* thread) { 4214 // consistent with what current_thread_cpu_time() returns. 4215 return os::thread_cpu_time(thread, true /* user+sys */); 4216} 4217 4218jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4219 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4220} 4221 4222jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 4223 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 4224 // If this function changes, os::is_thread_cpu_time_supported() should too 4225 FILETIME CreationTime; 4226 FILETIME ExitTime; 4227 FILETIME KernelTime; 4228 FILETIME UserTime; 4229 4230 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime, 4231 &ExitTime, &KernelTime, &UserTime) == 0) { 4232 return -1; 4233 } else if (user_sys_cpu_time) { 4234 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 4235 } else { 4236 return FT2INT64(UserTime) * 100; 4237 } 4238} 4239 4240void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4241 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4242 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4243 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4244 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4245} 4246 4247void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4248 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4249 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4250 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4251 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4252} 4253 4254bool os::is_thread_cpu_time_supported() { 4255 // see os::thread_cpu_time 4256 FILETIME CreationTime; 4257 FILETIME ExitTime; 4258 FILETIME KernelTime; 4259 FILETIME UserTime; 4260 4261 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime, 4262 &KernelTime, &UserTime) == 0) { 4263 return false; 4264 } else { 4265 return true; 4266 } 4267} 4268 4269// Windows does't provide a loadavg primitive so this is stubbed out for now. 4270// It does have primitives (PDH API) to get CPU usage and run queue length. 4271// "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 4272// If we wanted to implement loadavg on Windows, we have a few options: 4273// 4274// a) Query CPU usage and run queue length and "fake" an answer by 4275// returning the CPU usage if it's under 100%, and the run queue 4276// length otherwise. It turns out that querying is pretty slow 4277// on Windows, on the order of 200 microseconds on a fast machine. 4278// Note that on the Windows the CPU usage value is the % usage 4279// since the last time the API was called (and the first call 4280// returns 100%), so we'd have to deal with that as well. 4281// 4282// b) Sample the "fake" answer using a sampling thread and store 4283// the answer in a global variable. The call to loadavg would 4284// just return the value of the global, avoiding the slow query. 4285// 4286// c) Sample a better answer using exponential decay to smooth the 4287// value. This is basically the algorithm used by UNIX kernels. 4288// 4289// Note that sampling thread starvation could affect both (b) and (c). 4290int os::loadavg(double loadavg[], int nelem) { 4291 return -1; 4292} 4293 4294 4295// DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 4296bool os::dont_yield() { 4297 return DontYieldALot; 4298} 4299 4300// This method is a slightly reworked copy of JDK's sysOpen 4301// from src/windows/hpi/src/sys_api_md.c 4302 4303int os::open(const char *path, int oflag, int mode) { 4304 char pathbuf[MAX_PATH]; 4305 4306 if (strlen(path) > MAX_PATH - 1) { 4307 errno = ENAMETOOLONG; 4308 return -1; 4309 } 4310 os::native_path(strcpy(pathbuf, path)); 4311 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 4312} 4313 4314FILE* os::open(int fd, const char* mode) { 4315 return ::_fdopen(fd, mode); 4316} 4317 4318// Is a (classpath) directory empty? 4319bool os::dir_is_empty(const char* path) { 4320 WIN32_FIND_DATA fd; 4321 HANDLE f = FindFirstFile(path, &fd); 4322 if (f == INVALID_HANDLE_VALUE) { 4323 return true; 4324 } 4325 FindClose(f); 4326 return false; 4327} 4328 4329// create binary file, rewriting existing file if required 4330int os::create_binary_file(const char* path, bool rewrite_existing) { 4331 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 4332 if (!rewrite_existing) { 4333 oflags |= _O_EXCL; 4334 } 4335 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 4336} 4337 4338// return current position of file pointer 4339jlong os::current_file_offset(int fd) { 4340 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 4341} 4342 4343// move file pointer to the specified offset 4344jlong os::seek_to_file_offset(int fd, jlong offset) { 4345 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 4346} 4347 4348 4349jlong os::lseek(int fd, jlong offset, int whence) { 4350 return (jlong) ::_lseeki64(fd, offset, whence); 4351} 4352 4353size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 4354 OVERLAPPED ov; 4355 DWORD nread; 4356 BOOL result; 4357 4358 ZeroMemory(&ov, sizeof(ov)); 4359 ov.Offset = (DWORD)offset; 4360 ov.OffsetHigh = (DWORD)(offset >> 32); 4361 4362 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4363 4364 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov); 4365 4366 return result ? nread : 0; 4367} 4368 4369 4370// This method is a slightly reworked copy of JDK's sysNativePath 4371// from src/windows/hpi/src/path_md.c 4372 4373// Convert a pathname to native format. On win32, this involves forcing all 4374// separators to be '\\' rather than '/' (both are legal inputs, but Win95 4375// sometimes rejects '/') and removing redundant separators. The input path is 4376// assumed to have been converted into the character encoding used by the local 4377// system. Because this might be a double-byte encoding, care is taken to 4378// treat double-byte lead characters correctly. 4379// 4380// This procedure modifies the given path in place, as the result is never 4381// longer than the original. There is no error return; this operation always 4382// succeeds. 4383char * os::native_path(char *path) { 4384 char *src = path, *dst = path, *end = path; 4385 char *colon = NULL; // If a drive specifier is found, this will 4386 // point to the colon following the drive letter 4387 4388 // Assumption: '/', '\\', ':', and drive letters are never lead bytes 4389 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\')) 4390 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte"); 4391 4392 // Check for leading separators 4393#define isfilesep(c) ((c) == '/' || (c) == '\\') 4394 while (isfilesep(*src)) { 4395 src++; 4396 } 4397 4398 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 4399 // Remove leading separators if followed by drive specifier. This 4400 // hack is necessary to support file URLs containing drive 4401 // specifiers (e.g., "file://c:/path"). As a side effect, 4402 // "/c:/path" can be used as an alternative to "c:/path". 4403 *dst++ = *src++; 4404 colon = dst; 4405 *dst++ = ':'; 4406 src++; 4407 } else { 4408 src = path; 4409 if (isfilesep(src[0]) && isfilesep(src[1])) { 4410 // UNC pathname: Retain first separator; leave src pointed at 4411 // second separator so that further separators will be collapsed 4412 // into the second separator. The result will be a pathname 4413 // beginning with "\\\\" followed (most likely) by a host name. 4414 src = dst = path + 1; 4415 path[0] = '\\'; // Force first separator to '\\' 4416 } 4417 } 4418 4419 end = dst; 4420 4421 // Remove redundant separators from remainder of path, forcing all 4422 // separators to be '\\' rather than '/'. Also, single byte space 4423 // characters are removed from the end of the path because those 4424 // are not legal ending characters on this operating system. 4425 // 4426 while (*src != '\0') { 4427 if (isfilesep(*src)) { 4428 *dst++ = '\\'; src++; 4429 while (isfilesep(*src)) src++; 4430 if (*src == '\0') { 4431 // Check for trailing separator 4432 end = dst; 4433 if (colon == dst - 2) break; // "z:\\" 4434 if (dst == path + 1) break; // "\\" 4435 if (dst == path + 2 && isfilesep(path[0])) { 4436 // "\\\\" is not collapsed to "\\" because "\\\\" marks the 4437 // beginning of a UNC pathname. Even though it is not, by 4438 // itself, a valid UNC pathname, we leave it as is in order 4439 // to be consistent with the path canonicalizer as well 4440 // as the win32 APIs, which treat this case as an invalid 4441 // UNC pathname rather than as an alias for the root 4442 // directory of the current drive. 4443 break; 4444 } 4445 end = --dst; // Path does not denote a root directory, so 4446 // remove trailing separator 4447 break; 4448 } 4449 end = dst; 4450 } else { 4451 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character 4452 *dst++ = *src++; 4453 if (*src) *dst++ = *src++; 4454 end = dst; 4455 } else { // Copy a single-byte character 4456 char c = *src++; 4457 *dst++ = c; 4458 // Space is not a legal ending character 4459 if (c != ' ') end = dst; 4460 } 4461 } 4462 } 4463 4464 *end = '\0'; 4465 4466 // For "z:", add "." to work around a bug in the C runtime library 4467 if (colon == dst - 1) { 4468 path[2] = '.'; 4469 path[3] = '\0'; 4470 } 4471 4472 return path; 4473} 4474 4475// This code is a copy of JDK's sysSetLength 4476// from src/windows/hpi/src/sys_api_md.c 4477 4478int os::ftruncate(int fd, jlong length) { 4479 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4480 long high = (long)(length >> 32); 4481 DWORD ret; 4482 4483 if (h == (HANDLE)(-1)) { 4484 return -1; 4485 } 4486 4487 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 4488 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 4489 return -1; 4490 } 4491 4492 if (::SetEndOfFile(h) == FALSE) { 4493 return -1; 4494 } 4495 4496 return 0; 4497} 4498 4499int os::get_fileno(FILE* fp) { 4500 return _fileno(fp); 4501} 4502 4503// This code is a copy of JDK's sysSync 4504// from src/windows/hpi/src/sys_api_md.c 4505// except for the legacy workaround for a bug in Win 98 4506 4507int os::fsync(int fd) { 4508 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 4509 4510 if ((!::FlushFileBuffers(handle)) && 4511 (GetLastError() != ERROR_ACCESS_DENIED)) { 4512 // from winerror.h 4513 return -1; 4514 } 4515 return 0; 4516} 4517 4518static int nonSeekAvailable(int, long *); 4519static int stdinAvailable(int, long *); 4520 4521#define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR) 4522#define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO) 4523 4524// This code is a copy of JDK's sysAvailable 4525// from src/windows/hpi/src/sys_api_md.c 4526 4527int os::available(int fd, jlong *bytes) { 4528 jlong cur, end; 4529 struct _stati64 stbuf64; 4530 4531 if (::_fstati64(fd, &stbuf64) >= 0) { 4532 int mode = stbuf64.st_mode; 4533 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 4534 int ret; 4535 long lpbytes; 4536 if (fd == 0) { 4537 ret = stdinAvailable(fd, &lpbytes); 4538 } else { 4539 ret = nonSeekAvailable(fd, &lpbytes); 4540 } 4541 (*bytes) = (jlong)(lpbytes); 4542 return ret; 4543 } 4544 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 4545 return FALSE; 4546 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 4547 return FALSE; 4548 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 4549 return FALSE; 4550 } 4551 *bytes = end - cur; 4552 return TRUE; 4553 } else { 4554 return FALSE; 4555 } 4556} 4557 4558void os::flockfile(FILE* fp) { 4559 _lock_file(fp); 4560} 4561 4562void os::funlockfile(FILE* fp) { 4563 _unlock_file(fp); 4564} 4565 4566// This code is a copy of JDK's nonSeekAvailable 4567// from src/windows/hpi/src/sys_api_md.c 4568 4569static int nonSeekAvailable(int fd, long *pbytes) { 4570 // This is used for available on non-seekable devices 4571 // (like both named and anonymous pipes, such as pipes 4572 // connected to an exec'd process). 4573 // Standard Input is a special case. 4574 HANDLE han; 4575 4576 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 4577 return FALSE; 4578 } 4579 4580 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 4581 // PeekNamedPipe fails when at EOF. In that case we 4582 // simply make *pbytes = 0 which is consistent with the 4583 // behavior we get on Solaris when an fd is at EOF. 4584 // The only alternative is to raise an Exception, 4585 // which isn't really warranted. 4586 // 4587 if (::GetLastError() != ERROR_BROKEN_PIPE) { 4588 return FALSE; 4589 } 4590 *pbytes = 0; 4591 } 4592 return TRUE; 4593} 4594 4595#define MAX_INPUT_EVENTS 2000 4596 4597// This code is a copy of JDK's stdinAvailable 4598// from src/windows/hpi/src/sys_api_md.c 4599 4600static int stdinAvailable(int fd, long *pbytes) { 4601 HANDLE han; 4602 DWORD numEventsRead = 0; // Number of events read from buffer 4603 DWORD numEvents = 0; // Number of events in buffer 4604 DWORD i = 0; // Loop index 4605 DWORD curLength = 0; // Position marker 4606 DWORD actualLength = 0; // Number of bytes readable 4607 BOOL error = FALSE; // Error holder 4608 INPUT_RECORD *lpBuffer; // Pointer to records of input events 4609 4610 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4611 return FALSE; 4612 } 4613 4614 // Construct an array of input records in the console buffer 4615 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4616 if (error == 0) { 4617 return nonSeekAvailable(fd, pbytes); 4618 } 4619 4620 // lpBuffer must fit into 64K or else PeekConsoleInput fails 4621 if (numEvents > MAX_INPUT_EVENTS) { 4622 numEvents = MAX_INPUT_EVENTS; 4623 } 4624 4625 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal); 4626 if (lpBuffer == NULL) { 4627 return FALSE; 4628 } 4629 4630 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4631 if (error == 0) { 4632 os::free(lpBuffer); 4633 return FALSE; 4634 } 4635 4636 // Examine input records for the number of bytes available 4637 for (i=0; i<numEvents; i++) { 4638 if (lpBuffer[i].EventType == KEY_EVENT) { 4639 4640 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4641 &(lpBuffer[i].Event); 4642 if (keyRecord->bKeyDown == TRUE) { 4643 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4644 curLength++; 4645 if (*keyPressed == '\r') { 4646 actualLength = curLength; 4647 } 4648 } 4649 } 4650 } 4651 4652 if (lpBuffer != NULL) { 4653 os::free(lpBuffer); 4654 } 4655 4656 *pbytes = (long) actualLength; 4657 return TRUE; 4658} 4659 4660// Map a block of memory. 4661char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4662 char *addr, size_t bytes, bool read_only, 4663 bool allow_exec) { 4664 HANDLE hFile; 4665 char* base; 4666 4667 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4668 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4669 if (hFile == NULL) { 4670 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError()); 4671 return NULL; 4672 } 4673 4674 if (allow_exec) { 4675 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4676 // unless it comes from a PE image (which the shared archive is not.) 4677 // Even VirtualProtect refuses to give execute access to mapped memory 4678 // that was not previously executable. 4679 // 4680 // Instead, stick the executable region in anonymous memory. Yuck. 4681 // Penalty is that ~4 pages will not be shareable - in the future 4682 // we might consider DLLizing the shared archive with a proper PE 4683 // header so that mapping executable + sharing is possible. 4684 4685 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4686 PAGE_READWRITE); 4687 if (base == NULL) { 4688 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError()); 4689 CloseHandle(hFile); 4690 return NULL; 4691 } 4692 4693 DWORD bytes_read; 4694 OVERLAPPED overlapped; 4695 overlapped.Offset = (DWORD)file_offset; 4696 overlapped.OffsetHigh = 0; 4697 overlapped.hEvent = NULL; 4698 // ReadFile guarantees that if the return value is true, the requested 4699 // number of bytes were read before returning. 4700 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 4701 if (!res) { 4702 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError()); 4703 release_memory(base, bytes); 4704 CloseHandle(hFile); 4705 return NULL; 4706 } 4707 } else { 4708 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 4709 NULL /* file_name */); 4710 if (hMap == NULL) { 4711 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError()); 4712 CloseHandle(hFile); 4713 return NULL; 4714 } 4715 4716 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 4717 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 4718 (DWORD)bytes, addr); 4719 if (base == NULL) { 4720 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError()); 4721 CloseHandle(hMap); 4722 CloseHandle(hFile); 4723 return NULL; 4724 } 4725 4726 if (CloseHandle(hMap) == 0) { 4727 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError()); 4728 CloseHandle(hFile); 4729 return base; 4730 } 4731 } 4732 4733 if (allow_exec) { 4734 DWORD old_protect; 4735 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 4736 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 4737 4738 if (!res) { 4739 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError()); 4740 // Don't consider this a hard error, on IA32 even if the 4741 // VirtualProtect fails, we should still be able to execute 4742 CloseHandle(hFile); 4743 return base; 4744 } 4745 } 4746 4747 if (CloseHandle(hFile) == 0) { 4748 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError()); 4749 return base; 4750 } 4751 4752 return base; 4753} 4754 4755 4756// Remap a block of memory. 4757char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4758 char *addr, size_t bytes, bool read_only, 4759 bool allow_exec) { 4760 // This OS does not allow existing memory maps to be remapped so we 4761 // have to unmap the memory before we remap it. 4762 if (!os::unmap_memory(addr, bytes)) { 4763 return NULL; 4764 } 4765 4766 // There is a very small theoretical window between the unmap_memory() 4767 // call above and the map_memory() call below where a thread in native 4768 // code may be able to access an address that is no longer mapped. 4769 4770 return os::map_memory(fd, file_name, file_offset, addr, bytes, 4771 read_only, allow_exec); 4772} 4773 4774 4775// Unmap a block of memory. 4776// Returns true=success, otherwise false. 4777 4778bool os::pd_unmap_memory(char* addr, size_t bytes) { 4779 MEMORY_BASIC_INFORMATION mem_info; 4780 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) { 4781 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError()); 4782 return false; 4783 } 4784 4785 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx. 4786 // Instead, executable region was allocated using VirtualAlloc(). See 4787 // pd_map_memory() above. 4788 // 4789 // The following flags should match the 'exec_access' flages used for 4790 // VirtualProtect() in pd_map_memory(). 4791 if (mem_info.Protect == PAGE_EXECUTE_READ || 4792 mem_info.Protect == PAGE_EXECUTE_READWRITE) { 4793 return pd_release_memory(addr, bytes); 4794 } 4795 4796 BOOL result = UnmapViewOfFile(addr); 4797 if (result == 0) { 4798 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError()); 4799 return false; 4800 } 4801 return true; 4802} 4803 4804void os::pause() { 4805 char filename[MAX_PATH]; 4806 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4807 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4808 } else { 4809 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4810 } 4811 4812 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4813 if (fd != -1) { 4814 struct stat buf; 4815 ::close(fd); 4816 while (::stat(filename, &buf) == 0) { 4817 Sleep(100); 4818 } 4819 } else { 4820 jio_fprintf(stderr, 4821 "Could not open pause file '%s', continuing immediately.\n", filename); 4822 } 4823} 4824 4825os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 4826 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 4827} 4828 4829// See the caveats for this class in os_windows.hpp 4830// Protects the callback call so that raised OS EXCEPTIONS causes a jump back 4831// into this method and returns false. If no OS EXCEPTION was raised, returns 4832// true. 4833// The callback is supposed to provide the method that should be protected. 4834// 4835bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 4836 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); 4837 assert(!WatcherThread::watcher_thread()->has_crash_protection(), 4838 "crash_protection already set?"); 4839 4840 bool success = true; 4841 __try { 4842 WatcherThread::watcher_thread()->set_crash_protection(this); 4843 cb.call(); 4844 } __except(EXCEPTION_EXECUTE_HANDLER) { 4845 // only for protection, nothing to do 4846 success = false; 4847 } 4848 WatcherThread::watcher_thread()->set_crash_protection(NULL); 4849 return success; 4850} 4851 4852// An Event wraps a win32 "CreateEvent" kernel handle. 4853// 4854// We have a number of choices regarding "CreateEvent" win32 handle leakage: 4855// 4856// 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 4857// field, and call CloseHandle() on the win32 event handle. Unpark() would 4858// need to be modified to tolerate finding a NULL (invalid) win32 event handle. 4859// In addition, an unpark() operation might fetch the handle field, but the 4860// event could recycle between the fetch and the SetEvent() operation. 4861// SetEvent() would either fail because the handle was invalid, or inadvertently work, 4862// as the win32 handle value had been recycled. In an ideal world calling SetEvent() 4863// on an stale but recycled handle would be harmless, but in practice this might 4864// confuse other non-Sun code, so it's not a viable approach. 4865// 4866// 2: Once a win32 event handle is associated with an Event, it remains associated 4867// with the Event. The event handle is never closed. This could be construed 4868// as handle leakage, but only up to the maximum # of threads that have been extant 4869// at any one time. This shouldn't be an issue, as windows platforms typically 4870// permit a process to have hundreds of thousands of open handles. 4871// 4872// 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 4873// and release unused handles. 4874// 4875// 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 4876// It's not clear, however, that we wouldn't be trading one type of leak for another. 4877// 4878// 5. Use an RCU-like mechanism (Read-Copy Update). 4879// Or perhaps something similar to Maged Michael's "Hazard pointers". 4880// 4881// We use (2). 4882// 4883// TODO-FIXME: 4884// 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 4885// 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 4886// to recover from (or at least detect) the dreaded Windows 841176 bug. 4887// 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 4888// into a single win32 CreateEvent() handle. 4889// 4890// Assumption: 4891// Only one parker can exist on an event, which is why we allocate 4892// them per-thread. Multiple unparkers can coexist. 4893// 4894// _Event transitions in park() 4895// -1 => -1 : illegal 4896// 1 => 0 : pass - return immediately 4897// 0 => -1 : block; then set _Event to 0 before returning 4898// 4899// _Event transitions in unpark() 4900// 0 => 1 : just return 4901// 1 => 1 : just return 4902// -1 => either 0 or 1; must signal target thread 4903// That is, we can safely transition _Event from -1 to either 4904// 0 or 1. 4905// 4906// _Event serves as a restricted-range semaphore. 4907// -1 : thread is blocked, i.e. there is a waiter 4908// 0 : neutral: thread is running or ready, 4909// could have been signaled after a wait started 4910// 1 : signaled - thread is running or ready 4911// 4912// Another possible encoding of _Event would be with 4913// explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 4914// 4915 4916int os::PlatformEvent::park(jlong Millis) { 4917 // Transitions for _Event: 4918 // -1 => -1 : illegal 4919 // 1 => 0 : pass - return immediately 4920 // 0 => -1 : block; then set _Event to 0 before returning 4921 4922 guarantee(_ParkHandle != NULL , "Invariant"); 4923 guarantee(Millis > 0 , "Invariant"); 4924 4925 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 4926 // the initial park() operation. 4927 // Consider: use atomic decrement instead of CAS-loop 4928 4929 int v; 4930 for (;;) { 4931 v = _Event; 4932 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4933 } 4934 guarantee((v == 0) || (v == 1), "invariant"); 4935 if (v != 0) return OS_OK; 4936 4937 // Do this the hard way by blocking ... 4938 // TODO: consider a brief spin here, gated on the success of recent 4939 // spin attempts by this thread. 4940 // 4941 // We decompose long timeouts into series of shorter timed waits. 4942 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 4943 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 4944 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 4945 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 4946 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 4947 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 4948 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 4949 // for the already waited time. This policy does not admit any new outcomes. 4950 // In the future, however, we might want to track the accumulated wait time and 4951 // adjust Millis accordingly if we encounter a spurious wakeup. 4952 4953 const int MAXTIMEOUT = 0x10000000; 4954 DWORD rv = WAIT_TIMEOUT; 4955 while (_Event < 0 && Millis > 0) { 4956 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT) 4957 if (Millis > MAXTIMEOUT) { 4958 prd = MAXTIMEOUT; 4959 } 4960 rv = ::WaitForSingleObject(_ParkHandle, prd); 4961 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed"); 4962 if (rv == WAIT_TIMEOUT) { 4963 Millis -= prd; 4964 } 4965 } 4966 v = _Event; 4967 _Event = 0; 4968 // see comment at end of os::PlatformEvent::park() below: 4969 OrderAccess::fence(); 4970 // If we encounter a nearly simultanous timeout expiry and unpark() 4971 // we return OS_OK indicating we awoke via unpark(). 4972 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 4973 return (v >= 0) ? OS_OK : OS_TIMEOUT; 4974} 4975 4976void os::PlatformEvent::park() { 4977 // Transitions for _Event: 4978 // -1 => -1 : illegal 4979 // 1 => 0 : pass - return immediately 4980 // 0 => -1 : block; then set _Event to 0 before returning 4981 4982 guarantee(_ParkHandle != NULL, "Invariant"); 4983 // Invariant: Only the thread associated with the Event/PlatformEvent 4984 // may call park(). 4985 // Consider: use atomic decrement instead of CAS-loop 4986 int v; 4987 for (;;) { 4988 v = _Event; 4989 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4990 } 4991 guarantee((v == 0) || (v == 1), "invariant"); 4992 if (v != 0) return; 4993 4994 // Do this the hard way by blocking ... 4995 // TODO: consider a brief spin here, gated on the success of recent 4996 // spin attempts by this thread. 4997 while (_Event < 0) { 4998 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE); 4999 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed"); 5000 } 5001 5002 // Usually we'll find _Event == 0 at this point, but as 5003 // an optional optimization we clear it, just in case can 5004 // multiple unpark() operations drove _Event up to 1. 5005 _Event = 0; 5006 OrderAccess::fence(); 5007 guarantee(_Event >= 0, "invariant"); 5008} 5009 5010void os::PlatformEvent::unpark() { 5011 guarantee(_ParkHandle != NULL, "Invariant"); 5012 5013 // Transitions for _Event: 5014 // 0 => 1 : just return 5015 // 1 => 1 : just return 5016 // -1 => either 0 or 1; must signal target thread 5017 // That is, we can safely transition _Event from -1 to either 5018 // 0 or 1. 5019 // See also: "Semaphores in Plan 9" by Mullender & Cox 5020 // 5021 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5022 // that it will take two back-to-back park() calls for the owning 5023 // thread to block. This has the benefit of forcing a spurious return 5024 // from the first park() call after an unpark() call which will help 5025 // shake out uses of park() and unpark() without condition variables. 5026 5027 if (Atomic::xchg(1, &_Event) >= 0) return; 5028 5029 ::SetEvent(_ParkHandle); 5030} 5031 5032 5033// JSR166 5034// ------------------------------------------------------- 5035 5036// The Windows implementation of Park is very straightforward: Basic 5037// operations on Win32 Events turn out to have the right semantics to 5038// use them directly. We opportunistically resuse the event inherited 5039// from Monitor. 5040 5041void Parker::park(bool isAbsolute, jlong time) { 5042 guarantee(_ParkEvent != NULL, "invariant"); 5043 // First, demultiplex/decode time arguments 5044 if (time < 0) { // don't wait 5045 return; 5046 } else if (time == 0 && !isAbsolute) { 5047 time = INFINITE; 5048 } else if (isAbsolute) { 5049 time -= os::javaTimeMillis(); // convert to relative time 5050 if (time <= 0) { // already elapsed 5051 return; 5052 } 5053 } else { // relative 5054 time /= 1000000; // Must coarsen from nanos to millis 5055 if (time == 0) { // Wait for the minimal time unit if zero 5056 time = 1; 5057 } 5058 } 5059 5060 JavaThread* thread = JavaThread::current(); 5061 5062 // Don't wait if interrupted or already triggered 5063 if (Thread::is_interrupted(thread, false) || 5064 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 5065 ResetEvent(_ParkEvent); 5066 return; 5067 } else { 5068 ThreadBlockInVM tbivm(thread); 5069 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5070 thread->set_suspend_equivalent(); 5071 5072 WaitForSingleObject(_ParkEvent, time); 5073 ResetEvent(_ParkEvent); 5074 5075 // If externally suspended while waiting, re-suspend 5076 if (thread->handle_special_suspend_equivalent_condition()) { 5077 thread->java_suspend_self(); 5078 } 5079 } 5080} 5081 5082void Parker::unpark() { 5083 guarantee(_ParkEvent != NULL, "invariant"); 5084 SetEvent(_ParkEvent); 5085} 5086 5087// Run the specified command in a separate process. Return its exit value, 5088// or -1 on failure (e.g. can't create a new process). 5089int os::fork_and_exec(char* cmd) { 5090 STARTUPINFO si; 5091 PROCESS_INFORMATION pi; 5092 DWORD exit_code; 5093 5094 char * cmd_string; 5095 char * cmd_prefix = "cmd /C "; 5096 size_t len = strlen(cmd) + strlen(cmd_prefix) + 1; 5097 cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal); 5098 if (cmd_string == NULL) { 5099 return -1; 5100 } 5101 cmd_string[0] = '\0'; 5102 strcat(cmd_string, cmd_prefix); 5103 strcat(cmd_string, cmd); 5104 5105 // now replace all '\n' with '&' 5106 char * substring = cmd_string; 5107 while ((substring = strchr(substring, '\n')) != NULL) { 5108 substring[0] = '&'; 5109 substring++; 5110 } 5111 memset(&si, 0, sizeof(si)); 5112 si.cb = sizeof(si); 5113 memset(&pi, 0, sizeof(pi)); 5114 BOOL rslt = CreateProcess(NULL, // executable name - use command line 5115 cmd_string, // command line 5116 NULL, // process security attribute 5117 NULL, // thread security attribute 5118 TRUE, // inherits system handles 5119 0, // no creation flags 5120 NULL, // use parent's environment block 5121 NULL, // use parent's starting directory 5122 &si, // (in) startup information 5123 &pi); // (out) process information 5124 5125 if (rslt) { 5126 // Wait until child process exits. 5127 WaitForSingleObject(pi.hProcess, INFINITE); 5128 5129 GetExitCodeProcess(pi.hProcess, &exit_code); 5130 5131 // Close process and thread handles. 5132 CloseHandle(pi.hProcess); 5133 CloseHandle(pi.hThread); 5134 } else { 5135 exit_code = -1; 5136 } 5137 5138 FREE_C_HEAP_ARRAY(char, cmd_string); 5139 return (int)exit_code; 5140} 5141 5142bool os::find(address addr, outputStream* st) { 5143 int offset = -1; 5144 bool result = false; 5145 char buf[256]; 5146 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) { 5147 st->print(PTR_FORMAT " ", addr); 5148 if (strlen(buf) < sizeof(buf) - 1) { 5149 char* p = strrchr(buf, '\\'); 5150 if (p) { 5151 st->print("%s", p + 1); 5152 } else { 5153 st->print("%s", buf); 5154 } 5155 } else { 5156 // The library name is probably truncated. Let's omit the library name. 5157 // See also JDK-8147512. 5158 } 5159 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) { 5160 st->print("::%s + 0x%x", buf, offset); 5161 } 5162 st->cr(); 5163 result = true; 5164 } 5165 return result; 5166} 5167 5168LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 5169 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 5170 5171 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 5172 JavaThread* thread = JavaThread::current(); 5173 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 5174 address addr = (address) exceptionRecord->ExceptionInformation[1]; 5175 5176 if (os::is_memory_serialize_page(thread, addr)) { 5177 return EXCEPTION_CONTINUE_EXECUTION; 5178 } 5179 } 5180 5181 return EXCEPTION_CONTINUE_SEARCH; 5182} 5183 5184// We don't build a headless jre for Windows 5185bool os::is_headless_jre() { return false; } 5186 5187static jint initSock() { 5188 WSADATA wsadata; 5189 5190 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) { 5191 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n", 5192 ::GetLastError()); 5193 return JNI_ERR; 5194 } 5195 return JNI_OK; 5196} 5197 5198struct hostent* os::get_host_by_name(char* name) { 5199 return (struct hostent*)gethostbyname(name); 5200} 5201 5202int os::socket_close(int fd) { 5203 return ::closesocket(fd); 5204} 5205 5206int os::socket(int domain, int type, int protocol) { 5207 return ::socket(domain, type, protocol); 5208} 5209 5210int os::connect(int fd, struct sockaddr* him, socklen_t len) { 5211 return ::connect(fd, him, len); 5212} 5213 5214int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5215 return ::recv(fd, buf, (int)nBytes, flags); 5216} 5217 5218int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5219 return ::send(fd, buf, (int)nBytes, flags); 5220} 5221 5222int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5223 return ::send(fd, buf, (int)nBytes, flags); 5224} 5225 5226// WINDOWS CONTEXT Flags for THREAD_SAMPLING 5227#if defined(IA32) 5228 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS) 5229#elif defined (AMD64) 5230 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT) 5231#endif 5232 5233// returns true if thread could be suspended, 5234// false otherwise 5235static bool do_suspend(HANDLE* h) { 5236 if (h != NULL) { 5237 if (SuspendThread(*h) != ~0) { 5238 return true; 5239 } 5240 } 5241 return false; 5242} 5243 5244// resume the thread 5245// calling resume on an active thread is a no-op 5246static void do_resume(HANDLE* h) { 5247 if (h != NULL) { 5248 ResumeThread(*h); 5249 } 5250} 5251 5252// retrieve a suspend/resume context capable handle 5253// from the tid. Caller validates handle return value. 5254void get_thread_handle_for_extended_context(HANDLE* h, 5255 OSThread::thread_id_t tid) { 5256 if (h != NULL) { 5257 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid); 5258 } 5259} 5260 5261// Thread sampling implementation 5262// 5263void os::SuspendedThreadTask::internal_do_task() { 5264 CONTEXT ctxt; 5265 HANDLE h = NULL; 5266 5267 // get context capable handle for thread 5268 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id()); 5269 5270 // sanity 5271 if (h == NULL || h == INVALID_HANDLE_VALUE) { 5272 return; 5273 } 5274 5275 // suspend the thread 5276 if (do_suspend(&h)) { 5277 ctxt.ContextFlags = sampling_context_flags; 5278 // get thread context 5279 GetThreadContext(h, &ctxt); 5280 SuspendedThreadTaskContext context(_thread, &ctxt); 5281 // pass context to Thread Sampling impl 5282 do_task(context); 5283 // resume thread 5284 do_resume(&h); 5285 } 5286 5287 // close handle 5288 CloseHandle(h); 5289} 5290 5291bool os::start_debugging(char *buf, int buflen) { 5292 int len = (int)strlen(buf); 5293 char *p = &buf[len]; 5294 5295 jio_snprintf(p, buflen-len, 5296 "\n\n" 5297 "Do you want to debug the problem?\n\n" 5298 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n" 5299 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n" 5300 "Otherwise, select 'No' to abort...", 5301 os::current_process_id(), os::current_thread_id()); 5302 5303 bool yes = os::message_box("Unexpected Error", buf); 5304 5305 if (yes) { 5306 // os::breakpoint() calls DebugBreak(), which causes a breakpoint 5307 // exception. If VM is running inside a debugger, the debugger will 5308 // catch the exception. Otherwise, the breakpoint exception will reach 5309 // the default windows exception handler, which can spawn a debugger and 5310 // automatically attach to the dying VM. 5311 os::breakpoint(); 5312 yes = false; 5313 } 5314 return yes; 5315} 5316 5317void* os::get_default_process_handle() { 5318 return (void*)GetModuleHandle(NULL); 5319} 5320 5321// Builds a platform dependent Agent_OnLoad_<lib_name> function name 5322// which is used to find statically linked in agents. 5323// Additionally for windows, takes into account __stdcall names. 5324// Parameters: 5325// sym_name: Symbol in library we are looking for 5326// lib_name: Name of library to look in, NULL for shared libs. 5327// is_absolute_path == true if lib_name is absolute path to agent 5328// such as "C:/a/b/L.dll" 5329// == false if only the base name of the library is passed in 5330// such as "L" 5331char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 5332 bool is_absolute_path) { 5333 char *agent_entry_name; 5334 size_t len; 5335 size_t name_len; 5336 size_t prefix_len = strlen(JNI_LIB_PREFIX); 5337 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 5338 const char *start; 5339 5340 if (lib_name != NULL) { 5341 len = name_len = strlen(lib_name); 5342 if (is_absolute_path) { 5343 // Need to strip path, prefix and suffix 5344 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 5345 lib_name = ++start; 5346 } else { 5347 // Need to check for drive prefix 5348 if ((start = strchr(lib_name, ':')) != NULL) { 5349 lib_name = ++start; 5350 } 5351 } 5352 if (len <= (prefix_len + suffix_len)) { 5353 return NULL; 5354 } 5355 lib_name += prefix_len; 5356 name_len = strlen(lib_name) - suffix_len; 5357 } 5358 } 5359 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 5360 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 5361 if (agent_entry_name == NULL) { 5362 return NULL; 5363 } 5364 if (lib_name != NULL) { 5365 const char *p = strrchr(sym_name, '@'); 5366 if (p != NULL && p != sym_name) { 5367 // sym_name == _Agent_OnLoad@XX 5368 strncpy(agent_entry_name, sym_name, (p - sym_name)); 5369 agent_entry_name[(p-sym_name)] = '\0'; 5370 // agent_entry_name == _Agent_OnLoad 5371 strcat(agent_entry_name, "_"); 5372 strncat(agent_entry_name, lib_name, name_len); 5373 strcat(agent_entry_name, p); 5374 // agent_entry_name == _Agent_OnLoad_lib_name@XX 5375 } else { 5376 strcpy(agent_entry_name, sym_name); 5377 strcat(agent_entry_name, "_"); 5378 strncat(agent_entry_name, lib_name, name_len); 5379 } 5380 } else { 5381 strcpy(agent_entry_name, sym_name); 5382 } 5383 return agent_entry_name; 5384} 5385 5386#ifndef PRODUCT 5387 5388// test the code path in reserve_memory_special() that tries to allocate memory in a single 5389// contiguous memory block at a particular address. 5390// The test first tries to find a good approximate address to allocate at by using the same 5391// method to allocate some memory at any address. The test then tries to allocate memory in 5392// the vicinity (not directly after it to avoid possible by-chance use of that location) 5393// This is of course only some dodgy assumption, there is no guarantee that the vicinity of 5394// the previously allocated memory is available for allocation. The only actual failure 5395// that is reported is when the test tries to allocate at a particular location but gets a 5396// different valid one. A NULL return value at this point is not considered an error but may 5397// be legitimate. 5398// If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages. 5399void TestReserveMemorySpecial_test() { 5400 if (!UseLargePages) { 5401 if (VerboseInternalVMTests) { 5402 tty->print("Skipping test because large pages are disabled"); 5403 } 5404 return; 5405 } 5406 // save current value of globals 5407 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; 5408 bool old_use_numa_interleaving = UseNUMAInterleaving; 5409 5410 // set globals to make sure we hit the correct code path 5411 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; 5412 5413 // do an allocation at an address selected by the OS to get a good one. 5414 const size_t large_allocation_size = os::large_page_size() * 4; 5415 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); 5416 if (result == NULL) { 5417 if (VerboseInternalVMTests) { 5418 tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.", 5419 large_allocation_size); 5420 } 5421 } else { 5422 os::release_memory_special(result, large_allocation_size); 5423 5424 // allocate another page within the recently allocated memory area which seems to be a good location. At least 5425 // we managed to get it once. 5426 const size_t expected_allocation_size = os::large_page_size(); 5427 char* expected_location = result + os::large_page_size(); 5428 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); 5429 if (actual_location == NULL) { 5430 if (VerboseInternalVMTests) { 5431 tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.", 5432 expected_location, large_allocation_size); 5433 } 5434 } else { 5435 // release memory 5436 os::release_memory_special(actual_location, expected_allocation_size); 5437 // only now check, after releasing any memory to avoid any leaks. 5438 assert(actual_location == expected_location, 5439 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead", 5440 expected_location, expected_allocation_size, actual_location); 5441 } 5442 } 5443 5444 // restore globals 5445 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; 5446 UseNUMAInterleaving = old_use_numa_interleaving; 5447} 5448#endif // PRODUCT 5449 5450/* 5451 All the defined signal names for Windows. 5452 5453 NOTE that not all of these names are accepted by FindSignal! 5454 5455 For various reasons some of these may be rejected at runtime. 5456 5457 Here are the names currently accepted by a user of sun.misc.Signal with 5458 1.4.1 (ignoring potential interaction with use of chaining, etc): 5459 5460 (LIST TBD) 5461 5462*/ 5463int os::get_signal_number(const char* name) { 5464 static const struct { 5465 char* name; 5466 int number; 5467 } siglabels [] = 5468 // derived from version 6.0 VC98/include/signal.h 5469 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl 5470 "FPE", SIGFPE, // floating point exception 5471 "SEGV", SIGSEGV, // segment violation 5472 "INT", SIGINT, // interrupt 5473 "TERM", SIGTERM, // software term signal from kill 5474 "BREAK", SIGBREAK, // Ctrl-Break sequence 5475 "ILL", SIGILL}; // illegal instruction 5476 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) { 5477 if (strcmp(name, siglabels[i].name) == 0) { 5478 return siglabels[i].number; 5479 } 5480 } 5481 return -1; 5482} 5483 5484// Fast current thread access 5485 5486int os::win32::_thread_ptr_offset = 0; 5487 5488static void call_wrapper_dummy() {} 5489 5490// We need to call the os_exception_wrapper once so that it sets 5491// up the offset from FS of the thread pointer. 5492void os::win32::initialize_thread_ptr_offset() { 5493 os::os_exception_wrapper((java_call_t)call_wrapper_dummy, 5494 NULL, NULL, NULL, NULL); 5495} 5496