os_windows.cpp revision 9651:f7dc8eebc3f5
1/* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25// Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce 26#define _WIN32_WINNT 0x0600 27 28// no precompiled headers 29#include "classfile/classLoader.hpp" 30#include "classfile/systemDictionary.hpp" 31#include "classfile/vmSymbols.hpp" 32#include "code/icBuffer.hpp" 33#include "code/vtableStubs.hpp" 34#include "compiler/compileBroker.hpp" 35#include "compiler/disassembler.hpp" 36#include "interpreter/interpreter.hpp" 37#include "jvm_windows.h" 38#include "memory/allocation.inline.hpp" 39#include "memory/filemap.hpp" 40#include "mutex_windows.inline.hpp" 41#include "oops/oop.inline.hpp" 42#include "os_share_windows.hpp" 43#include "os_windows.inline.hpp" 44#include "prims/jniFastGetField.hpp" 45#include "prims/jvm.h" 46#include "prims/jvm_misc.hpp" 47#include "runtime/arguments.hpp" 48#include "runtime/atomic.inline.hpp" 49#include "runtime/extendedPC.hpp" 50#include "runtime/globals.hpp" 51#include "runtime/interfaceSupport.hpp" 52#include "runtime/java.hpp" 53#include "runtime/javaCalls.hpp" 54#include "runtime/mutexLocker.hpp" 55#include "runtime/objectMonitor.hpp" 56#include "runtime/orderAccess.inline.hpp" 57#include "runtime/osThread.hpp" 58#include "runtime/perfMemory.hpp" 59#include "runtime/sharedRuntime.hpp" 60#include "runtime/statSampler.hpp" 61#include "runtime/stubRoutines.hpp" 62#include "runtime/thread.inline.hpp" 63#include "runtime/threadCritical.hpp" 64#include "runtime/timer.hpp" 65#include "runtime/vm_version.hpp" 66#include "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/vmError.hpp" 75 76#ifdef _DEBUG 77#include <crtdbg.h> 78#endif 79 80 81#include <windows.h> 82#include <sys/types.h> 83#include <sys/stat.h> 84#include <sys/timeb.h> 85#include <objidl.h> 86#include <shlobj.h> 87 88#include <malloc.h> 89#include <signal.h> 90#include <direct.h> 91#include <errno.h> 92#include <fcntl.h> 93#include <io.h> 94#include <process.h> // For _beginthreadex(), _endthreadex() 95#include <imagehlp.h> // For os::dll_address_to_function_name 96// for enumerating dll libraries 97#include <vdmdbg.h> 98 99// for timer info max values which include all bits 100#define ALL_64_BITS CONST64(-1) 101 102// For DLL loading/load error detection 103// Values of PE COFF 104#define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c 105#define IMAGE_FILE_SIGNATURE_LENGTH 4 106 107static HANDLE main_process; 108static HANDLE main_thread; 109static int main_thread_id; 110 111static FILETIME process_creation_time; 112static FILETIME process_exit_time; 113static FILETIME process_user_time; 114static FILETIME process_kernel_time; 115 116#ifdef _M_IA64 117 #define __CPU__ ia64 118#else 119 #ifdef _M_AMD64 120 #define __CPU__ amd64 121 #else 122 #define __CPU__ i486 123 #endif 124#endif 125 126// save DLL module handle, used by GetModuleFileName 127 128HINSTANCE vm_lib_handle; 129 130BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { 131 switch (reason) { 132 case DLL_PROCESS_ATTACH: 133 vm_lib_handle = hinst; 134 if (ForceTimeHighResolution) { 135 timeBeginPeriod(1L); 136 } 137 break; 138 case DLL_PROCESS_DETACH: 139 if (ForceTimeHighResolution) { 140 timeEndPeriod(1L); 141 } 142 break; 143 default: 144 break; 145 } 146 return true; 147} 148 149static inline double fileTimeAsDouble(FILETIME* time) { 150 const double high = (double) ((unsigned int) ~0); 151 const double split = 10000000.0; 152 double result = (time->dwLowDateTime / split) + 153 time->dwHighDateTime * (high/split); 154 return result; 155} 156 157// Implementation of os 158 159bool os::unsetenv(const char* name) { 160 assert(name != NULL, "Null pointer"); 161 return (SetEnvironmentVariable(name, NULL) == TRUE); 162} 163 164// No setuid programs under Windows. 165bool os::have_special_privileges() { 166 return false; 167} 168 169 170// This method is a periodic task to check for misbehaving JNI applications 171// under CheckJNI, we can add any periodic checks here. 172// For Windows at the moment does nothing 173void os::run_periodic_checks() { 174 return; 175} 176 177// previous UnhandledExceptionFilter, if there is one 178static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL; 179 180LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 181 182void os::init_system_properties_values() { 183 // sysclasspath, java_home, dll_dir 184 { 185 char *home_path; 186 char *dll_path; 187 char *pslash; 188 char *bin = "\\bin"; 189 char home_dir[MAX_PATH + 1]; 190 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR"); 191 192 if (alt_home_dir != NULL) { 193 strncpy(home_dir, alt_home_dir, MAX_PATH + 1); 194 home_dir[MAX_PATH] = '\0'; 195 } else { 196 os::jvm_path(home_dir, sizeof(home_dir)); 197 // Found the full path to jvm.dll. 198 // Now cut the path to <java_home>/jre if we can. 199 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll 200 pslash = strrchr(home_dir, '\\'); 201 if (pslash != NULL) { 202 *pslash = '\0'; // get rid of \{client|server} 203 pslash = strrchr(home_dir, '\\'); 204 if (pslash != NULL) { 205 *pslash = '\0'; // get rid of \bin 206 } 207 } 208 } 209 210 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal); 211 if (home_path == NULL) { 212 return; 213 } 214 strcpy(home_path, home_dir); 215 Arguments::set_java_home(home_path); 216 FREE_C_HEAP_ARRAY(char, home_path); 217 218 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, 219 mtInternal); 220 if (dll_path == NULL) { 221 return; 222 } 223 strcpy(dll_path, home_dir); 224 strcat(dll_path, bin); 225 Arguments::set_dll_dir(dll_path); 226 FREE_C_HEAP_ARRAY(char, dll_path); 227 228 if (!set_boot_path('\\', ';')) { 229 return; 230 } 231 } 232 233// library_path 234#define EXT_DIR "\\lib\\ext" 235#define BIN_DIR "\\bin" 236#define PACKAGE_DIR "\\Sun\\Java" 237 { 238 // Win32 library search order (See the documentation for LoadLibrary): 239 // 240 // 1. The directory from which application is loaded. 241 // 2. The system wide Java Extensions directory (Java only) 242 // 3. System directory (GetSystemDirectory) 243 // 4. Windows directory (GetWindowsDirectory) 244 // 5. The PATH environment variable 245 // 6. The current directory 246 247 char *library_path; 248 char tmp[MAX_PATH]; 249 char *path_str = ::getenv("PATH"); 250 251 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 252 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal); 253 254 library_path[0] = '\0'; 255 256 GetModuleFileName(NULL, tmp, sizeof(tmp)); 257 *(strrchr(tmp, '\\')) = '\0'; 258 strcat(library_path, tmp); 259 260 GetWindowsDirectory(tmp, sizeof(tmp)); 261 strcat(library_path, ";"); 262 strcat(library_path, tmp); 263 strcat(library_path, PACKAGE_DIR BIN_DIR); 264 265 GetSystemDirectory(tmp, sizeof(tmp)); 266 strcat(library_path, ";"); 267 strcat(library_path, tmp); 268 269 GetWindowsDirectory(tmp, sizeof(tmp)); 270 strcat(library_path, ";"); 271 strcat(library_path, tmp); 272 273 if (path_str) { 274 strcat(library_path, ";"); 275 strcat(library_path, path_str); 276 } 277 278 strcat(library_path, ";."); 279 280 Arguments::set_library_path(library_path); 281 FREE_C_HEAP_ARRAY(char, library_path); 282 } 283 284 // Default extensions directory 285 { 286 char path[MAX_PATH]; 287 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 288 GetWindowsDirectory(path, MAX_PATH); 289 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 290 path, PACKAGE_DIR, EXT_DIR); 291 Arguments::set_ext_dirs(buf); 292 } 293 #undef EXT_DIR 294 #undef BIN_DIR 295 #undef PACKAGE_DIR 296 297#ifndef _WIN64 298 // set our UnhandledExceptionFilter and save any previous one 299 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception); 300#endif 301 302 // Done 303 return; 304} 305 306void os::breakpoint() { 307 DebugBreak(); 308} 309 310// Invoked from the BREAKPOINT Macro 311extern "C" void breakpoint() { 312 os::breakpoint(); 313} 314 315// RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP. 316// So far, this method is only used by Native Memory Tracking, which is 317// only supported on Windows XP or later. 318// 319int os::get_native_stack(address* stack, int frames, int toSkip) { 320#ifdef _NMT_NOINLINE_ 321 toSkip++; 322#endif 323 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames, 324 (PVOID*)stack, NULL); 325 for (int index = captured; index < frames; index ++) { 326 stack[index] = NULL; 327 } 328 return captured; 329} 330 331 332// os::current_stack_base() 333// 334// Returns the base of the stack, which is the stack's 335// starting address. This function must be called 336// while running on the stack of the thread being queried. 337 338address os::current_stack_base() { 339 MEMORY_BASIC_INFORMATION minfo; 340 address stack_bottom; 341 size_t stack_size; 342 343 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 344 stack_bottom = (address)minfo.AllocationBase; 345 stack_size = minfo.RegionSize; 346 347 // Add up the sizes of all the regions with the same 348 // AllocationBase. 349 while (1) { 350 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 351 if (stack_bottom == (address)minfo.AllocationBase) { 352 stack_size += minfo.RegionSize; 353 } else { 354 break; 355 } 356 } 357 358#ifdef _M_IA64 359 // IA64 has memory and register stacks 360 // 361 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit 362 // at thread creation (1MB backing store growing upwards, 1MB memory stack 363 // growing downwards, 2MB summed up) 364 // 365 // ... 366 // ------- top of stack (high address) ----- 367 // | 368 // | 1MB 369 // | Backing Store (Register Stack) 370 // | 371 // | / \ 372 // | | 373 // | | 374 // | | 375 // ------------------------ stack base ----- 376 // | 1MB 377 // | Memory Stack 378 // | 379 // | | 380 // | | 381 // | | 382 // | \ / 383 // | 384 // ----- bottom of stack (low address) ----- 385 // ... 386 387 stack_size = stack_size / 2; 388#endif 389 return stack_bottom + stack_size; 390} 391 392size_t os::current_stack_size() { 393 size_t sz; 394 MEMORY_BASIC_INFORMATION minfo; 395 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 396 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 397 return sz; 398} 399 400struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 401 const struct tm* time_struct_ptr = localtime(clock); 402 if (time_struct_ptr != NULL) { 403 *res = *time_struct_ptr; 404 return res; 405 } 406 return NULL; 407} 408 409LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 410 411// Thread start routine for all new Java threads 412static unsigned __stdcall java_start(Thread* thread) { 413 // Try to randomize the cache line index of hot stack frames. 414 // This helps when threads of the same stack traces evict each other's 415 // cache lines. The threads can be either from the same JVM instance, or 416 // from different JVM instances. The benefit is especially true for 417 // processors with hyperthreading technology. 418 static int counter = 0; 419 int pid = os::current_process_id(); 420 _alloca(((pid ^ counter++) & 7) * 128); 421 422 thread->initialize_thread_current(); 423 424 OSThread* osthr = thread->osthread(); 425 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 426 427 if (UseNUMA) { 428 int lgrp_id = os::numa_get_group_id(); 429 if (lgrp_id != -1) { 430 thread->set_lgrp_id(lgrp_id); 431 } 432 } 433 434 // Diagnostic code to investigate JDK-6573254 435 int res = 30115; // non-java thread 436 if (thread->is_Java_thread()) { 437 res = 20115; // java thread 438 } 439 440 // Install a win32 structured exception handler around every thread created 441 // by VM, so VM can generate error dump when an exception occurred in non- 442 // Java thread (e.g. VM thread). 443 __try { 444 thread->run(); 445 } __except(topLevelExceptionFilter( 446 (_EXCEPTION_POINTERS*)_exception_info())) { 447 // Nothing to do. 448 } 449 450 // One less thread is executing 451 // When the VMThread gets here, the main thread may have already exited 452 // which frees the CodeHeap containing the Atomic::add code 453 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 454 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); 455 } 456 457 // Thread must not return from exit_process_or_thread(), but if it does, 458 // let it proceed to exit normally 459 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res); 460} 461 462static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, 463 int thread_id) { 464 // Allocate the OSThread object 465 OSThread* osthread = new OSThread(NULL, NULL); 466 if (osthread == NULL) return NULL; 467 468 // Initialize support for Java interrupts 469 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 470 if (interrupt_event == NULL) { 471 delete osthread; 472 return NULL; 473 } 474 osthread->set_interrupt_event(interrupt_event); 475 476 // Store info on the Win32 thread into the OSThread 477 osthread->set_thread_handle(thread_handle); 478 osthread->set_thread_id(thread_id); 479 480 if (UseNUMA) { 481 int lgrp_id = os::numa_get_group_id(); 482 if (lgrp_id != -1) { 483 thread->set_lgrp_id(lgrp_id); 484 } 485 } 486 487 // Initial thread state is INITIALIZED, not SUSPENDED 488 osthread->set_state(INITIALIZED); 489 490 return osthread; 491} 492 493 494bool os::create_attached_thread(JavaThread* thread) { 495#ifdef ASSERT 496 thread->verify_not_published(); 497#endif 498 HANDLE thread_h; 499 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 500 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 501 fatal("DuplicateHandle failed\n"); 502 } 503 OSThread* osthread = create_os_thread(thread, thread_h, 504 (int)current_thread_id()); 505 if (osthread == NULL) { 506 return false; 507 } 508 509 // Initial thread state is RUNNABLE 510 osthread->set_state(RUNNABLE); 511 512 thread->set_osthread(osthread); 513 return true; 514} 515 516bool os::create_main_thread(JavaThread* thread) { 517#ifdef ASSERT 518 thread->verify_not_published(); 519#endif 520 if (_starting_thread == NULL) { 521 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 522 if (_starting_thread == NULL) { 523 return false; 524 } 525 } 526 527 // The primordial thread is runnable from the start) 528 _starting_thread->set_state(RUNNABLE); 529 530 thread->set_osthread(_starting_thread); 531 return true; 532} 533 534// Allocate and initialize a new OSThread 535bool os::create_thread(Thread* thread, ThreadType thr_type, 536 size_t stack_size) { 537 unsigned thread_id; 538 539 // Allocate the OSThread object 540 OSThread* osthread = new OSThread(NULL, NULL); 541 if (osthread == NULL) { 542 return false; 543 } 544 545 // Initialize support for Java interrupts 546 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 547 if (interrupt_event == NULL) { 548 delete osthread; 549 return NULL; 550 } 551 osthread->set_interrupt_event(interrupt_event); 552 osthread->set_interrupted(false); 553 554 thread->set_osthread(osthread); 555 556 if (stack_size == 0) { 557 switch (thr_type) { 558 case os::java_thread: 559 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 560 if (JavaThread::stack_size_at_create() > 0) { 561 stack_size = JavaThread::stack_size_at_create(); 562 } 563 break; 564 case os::compiler_thread: 565 if (CompilerThreadStackSize > 0) { 566 stack_size = (size_t)(CompilerThreadStackSize * K); 567 break; 568 } // else fall through: 569 // use VMThreadStackSize if CompilerThreadStackSize is not defined 570 case os::vm_thread: 571 case os::pgc_thread: 572 case os::cgc_thread: 573 case os::watcher_thread: 574 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 575 break; 576 } 577 } 578 579 // Create the Win32 thread 580 // 581 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 582 // does not specify stack size. Instead, it specifies the size of 583 // initially committed space. The stack size is determined by 584 // PE header in the executable. If the committed "stack_size" is larger 585 // than default value in the PE header, the stack is rounded up to the 586 // nearest multiple of 1MB. For example if the launcher has default 587 // stack size of 320k, specifying any size less than 320k does not 588 // affect the actual stack size at all, it only affects the initial 589 // commitment. On the other hand, specifying 'stack_size' larger than 590 // default value may cause significant increase in memory usage, because 591 // not only the stack space will be rounded up to MB, but also the 592 // entire space is committed upfront. 593 // 594 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 595 // for CreateThread() that can treat 'stack_size' as stack size. However we 596 // are not supposed to call CreateThread() directly according to MSDN 597 // document because JVM uses C runtime library. The good news is that the 598 // flag appears to work with _beginthredex() as well. 599 600#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION 601 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000) 602#endif 603 604 HANDLE thread_handle = 605 (HANDLE)_beginthreadex(NULL, 606 (unsigned)stack_size, 607 (unsigned (__stdcall *)(void*)) java_start, 608 thread, 609 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, 610 &thread_id); 611 if (thread_handle == NULL) { 612 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again 613 // without the flag. 614 thread_handle = 615 (HANDLE)_beginthreadex(NULL, 616 (unsigned)stack_size, 617 (unsigned (__stdcall *)(void*)) java_start, 618 thread, 619 CREATE_SUSPENDED, 620 &thread_id); 621 } 622 if (thread_handle == NULL) { 623 // Need to clean up stuff we've allocated so far 624 CloseHandle(osthread->interrupt_event()); 625 thread->set_osthread(NULL); 626 delete osthread; 627 return NULL; 628 } 629 630 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); 631 632 // Store info on the Win32 thread into the OSThread 633 osthread->set_thread_handle(thread_handle); 634 osthread->set_thread_id(thread_id); 635 636 // Initial thread state is INITIALIZED, not SUSPENDED 637 osthread->set_state(INITIALIZED); 638 639 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 640 return true; 641} 642 643 644// Free Win32 resources related to the OSThread 645void os::free_thread(OSThread* osthread) { 646 assert(osthread != NULL, "osthread not set"); 647 CloseHandle(osthread->thread_handle()); 648 CloseHandle(osthread->interrupt_event()); 649 delete osthread; 650} 651 652static jlong first_filetime; 653static jlong initial_performance_count; 654static jlong performance_frequency; 655 656 657jlong as_long(LARGE_INTEGER x) { 658 jlong result = 0; // initialization to avoid warning 659 set_high(&result, x.HighPart); 660 set_low(&result, x.LowPart); 661 return result; 662} 663 664 665jlong os::elapsed_counter() { 666 LARGE_INTEGER count; 667 if (win32::_has_performance_count) { 668 QueryPerformanceCounter(&count); 669 return as_long(count) - initial_performance_count; 670 } else { 671 FILETIME wt; 672 GetSystemTimeAsFileTime(&wt); 673 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime); 674 } 675} 676 677 678jlong os::elapsed_frequency() { 679 if (win32::_has_performance_count) { 680 return performance_frequency; 681 } else { 682 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601. 683 return 10000000; 684 } 685} 686 687 688julong os::available_memory() { 689 return win32::available_memory(); 690} 691 692julong os::win32::available_memory() { 693 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 694 // value if total memory is larger than 4GB 695 MEMORYSTATUSEX ms; 696 ms.dwLength = sizeof(ms); 697 GlobalMemoryStatusEx(&ms); 698 699 return (julong)ms.ullAvailPhys; 700} 701 702julong os::physical_memory() { 703 return win32::physical_memory(); 704} 705 706bool os::has_allocatable_memory_limit(julong* limit) { 707 MEMORYSTATUSEX ms; 708 ms.dwLength = sizeof(ms); 709 GlobalMemoryStatusEx(&ms); 710#ifdef _LP64 711 *limit = (julong)ms.ullAvailVirtual; 712 return true; 713#else 714 // Limit to 1400m because of the 2gb address space wall 715 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual); 716 return true; 717#endif 718} 719 720// VC6 lacks DWORD_PTR 721#if _MSC_VER < 1300 722typedef UINT_PTR DWORD_PTR; 723#endif 724 725int os::active_processor_count() { 726 DWORD_PTR lpProcessAffinityMask = 0; 727 DWORD_PTR lpSystemAffinityMask = 0; 728 int proc_count = processor_count(); 729 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 730 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 731 // Nof active processors is number of bits in process affinity mask 732 int bitcount = 0; 733 while (lpProcessAffinityMask != 0) { 734 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 735 bitcount++; 736 } 737 return bitcount; 738 } else { 739 return proc_count; 740 } 741} 742 743void os::set_native_thread_name(const char *name) { 744 745 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx 746 // 747 // Note that unfortunately this only works if the process 748 // is already attached to a debugger; debugger must observe 749 // the exception below to show the correct name. 750 751 const DWORD MS_VC_EXCEPTION = 0x406D1388; 752 struct { 753 DWORD dwType; // must be 0x1000 754 LPCSTR szName; // pointer to name (in user addr space) 755 DWORD dwThreadID; // thread ID (-1=caller thread) 756 DWORD dwFlags; // reserved for future use, must be zero 757 } info; 758 759 info.dwType = 0x1000; 760 info.szName = name; 761 info.dwThreadID = -1; 762 info.dwFlags = 0; 763 764 __try { 765 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info ); 766 } __except(EXCEPTION_CONTINUE_EXECUTION) {} 767} 768 769bool os::distribute_processes(uint length, uint* distribution) { 770 // Not yet implemented. 771 return false; 772} 773 774bool os::bind_to_processor(uint processor_id) { 775 // Not yet implemented. 776 return false; 777} 778 779void os::win32::initialize_performance_counter() { 780 LARGE_INTEGER count; 781 if (QueryPerformanceFrequency(&count)) { 782 win32::_has_performance_count = 1; 783 performance_frequency = as_long(count); 784 QueryPerformanceCounter(&count); 785 initial_performance_count = as_long(count); 786 } else { 787 win32::_has_performance_count = 0; 788 FILETIME wt; 789 GetSystemTimeAsFileTime(&wt); 790 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 791 } 792} 793 794 795double os::elapsedTime() { 796 return (double) elapsed_counter() / (double) elapsed_frequency(); 797} 798 799 800// Windows format: 801// The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 802// Java format: 803// Java standards require the number of milliseconds since 1/1/1970 804 805// Constant offset - calculated using offset() 806static jlong _offset = 116444736000000000; 807// Fake time counter for reproducible results when debugging 808static jlong fake_time = 0; 809 810#ifdef ASSERT 811// Just to be safe, recalculate the offset in debug mode 812static jlong _calculated_offset = 0; 813static int _has_calculated_offset = 0; 814 815jlong offset() { 816 if (_has_calculated_offset) return _calculated_offset; 817 SYSTEMTIME java_origin; 818 java_origin.wYear = 1970; 819 java_origin.wMonth = 1; 820 java_origin.wDayOfWeek = 0; // ignored 821 java_origin.wDay = 1; 822 java_origin.wHour = 0; 823 java_origin.wMinute = 0; 824 java_origin.wSecond = 0; 825 java_origin.wMilliseconds = 0; 826 FILETIME jot; 827 if (!SystemTimeToFileTime(&java_origin, &jot)) { 828 fatal("Error = %d\nWindows error", GetLastError()); 829 } 830 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 831 _has_calculated_offset = 1; 832 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 833 return _calculated_offset; 834} 835#else 836jlong offset() { 837 return _offset; 838} 839#endif 840 841jlong windows_to_java_time(FILETIME wt) { 842 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 843 return (a - offset()) / 10000; 844} 845 846// Returns time ticks in (10th of micro seconds) 847jlong windows_to_time_ticks(FILETIME wt) { 848 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 849 return (a - offset()); 850} 851 852FILETIME java_to_windows_time(jlong l) { 853 jlong a = (l * 10000) + offset(); 854 FILETIME result; 855 result.dwHighDateTime = high(a); 856 result.dwLowDateTime = low(a); 857 return result; 858} 859 860bool os::supports_vtime() { return true; } 861bool os::enable_vtime() { return false; } 862bool os::vtime_enabled() { return false; } 863 864double os::elapsedVTime() { 865 FILETIME created; 866 FILETIME exited; 867 FILETIME kernel; 868 FILETIME user; 869 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) { 870 // the resolution of windows_to_java_time() should be sufficient (ms) 871 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS; 872 } else { 873 return elapsedTime(); 874 } 875} 876 877jlong os::javaTimeMillis() { 878 if (UseFakeTimers) { 879 return fake_time++; 880 } else { 881 FILETIME wt; 882 GetSystemTimeAsFileTime(&wt); 883 return windows_to_java_time(wt); 884 } 885} 886 887void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 888 FILETIME wt; 889 GetSystemTimeAsFileTime(&wt); 890 jlong ticks = windows_to_time_ticks(wt); // 10th of micros 891 jlong secs = jlong(ticks / 10000000); // 10000 * 1000 892 seconds = secs; 893 nanos = jlong(ticks - (secs*10000000)) * 100; 894} 895 896jlong os::javaTimeNanos() { 897 if (!win32::_has_performance_count) { 898 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do. 899 } else { 900 LARGE_INTEGER current_count; 901 QueryPerformanceCounter(¤t_count); 902 double current = as_long(current_count); 903 double freq = performance_frequency; 904 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC); 905 return time; 906 } 907} 908 909void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 910 if (!win32::_has_performance_count) { 911 // javaTimeMillis() doesn't have much percision, 912 // but it is not going to wrap -- so all 64 bits 913 info_ptr->max_value = ALL_64_BITS; 914 915 // this is a wall clock timer, so may skip 916 info_ptr->may_skip_backward = true; 917 info_ptr->may_skip_forward = true; 918 } else { 919 jlong freq = performance_frequency; 920 if (freq < NANOSECS_PER_SEC) { 921 // the performance counter is 64 bits and we will 922 // be multiplying it -- so no wrap in 64 bits 923 info_ptr->max_value = ALL_64_BITS; 924 } else if (freq > NANOSECS_PER_SEC) { 925 // use the max value the counter can reach to 926 // determine the max value which could be returned 927 julong max_counter = (julong)ALL_64_BITS; 928 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC)); 929 } else { 930 // the performance counter is 64 bits and we will 931 // be using it directly -- so no wrap in 64 bits 932 info_ptr->max_value = ALL_64_BITS; 933 } 934 935 // using a counter, so no skipping 936 info_ptr->may_skip_backward = false; 937 info_ptr->may_skip_forward = false; 938 } 939 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 940} 941 942char* os::local_time_string(char *buf, size_t buflen) { 943 SYSTEMTIME st; 944 GetLocalTime(&st); 945 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 946 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 947 return buf; 948} 949 950bool os::getTimesSecs(double* process_real_time, 951 double* process_user_time, 952 double* process_system_time) { 953 HANDLE h_process = GetCurrentProcess(); 954 FILETIME create_time, exit_time, kernel_time, user_time; 955 BOOL result = GetProcessTimes(h_process, 956 &create_time, 957 &exit_time, 958 &kernel_time, 959 &user_time); 960 if (result != 0) { 961 FILETIME wt; 962 GetSystemTimeAsFileTime(&wt); 963 jlong rtc_millis = windows_to_java_time(wt); 964 jlong user_millis = windows_to_java_time(user_time); 965 jlong system_millis = windows_to_java_time(kernel_time); 966 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 967 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); 968 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); 969 return true; 970 } else { 971 return false; 972 } 973} 974 975void os::shutdown() { 976 // allow PerfMemory to attempt cleanup of any persistent resources 977 perfMemory_exit(); 978 979 // flush buffered output, finish log files 980 ostream_abort(); 981 982 // Check for abort hook 983 abort_hook_t abort_hook = Arguments::abort_hook(); 984 if (abort_hook != NULL) { 985 abort_hook(); 986 } 987} 988 989 990static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 991 PMINIDUMP_EXCEPTION_INFORMATION, 992 PMINIDUMP_USER_STREAM_INFORMATION, 993 PMINIDUMP_CALLBACK_INFORMATION); 994 995static HANDLE dumpFile = NULL; 996 997// Check if dump file can be created. 998void os::check_dump_limit(char* buffer, size_t buffsz) { 999 bool status = true; 1000 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) { 1001 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line"); 1002 status = false; 1003 } 1004 1005#ifndef ASSERT 1006 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) { 1007 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows"); 1008 status = false; 1009 } 1010#endif 1011 1012 if (status) { 1013 const char* cwd = get_current_directory(NULL, 0); 1014 int pid = current_process_id(); 1015 if (cwd != NULL) { 1016 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid); 1017 } else { 1018 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid); 1019 } 1020 1021 if (dumpFile == NULL && 1022 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL)) 1023 == INVALID_HANDLE_VALUE) { 1024 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError()); 1025 status = false; 1026 } 1027 } 1028 VMError::record_coredump_status(buffer, status); 1029} 1030 1031void os::abort(bool dump_core, void* siginfo, void* context) { 1032 HINSTANCE dbghelp; 1033 EXCEPTION_POINTERS ep; 1034 MINIDUMP_EXCEPTION_INFORMATION mei; 1035 MINIDUMP_EXCEPTION_INFORMATION* pmei; 1036 1037 HANDLE hProcess = GetCurrentProcess(); 1038 DWORD processId = GetCurrentProcessId(); 1039 MINIDUMP_TYPE dumpType; 1040 1041 shutdown(); 1042 if (!dump_core || dumpFile == NULL) { 1043 if (dumpFile != NULL) { 1044 CloseHandle(dumpFile); 1045 } 1046 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1047 } 1048 1049 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0); 1050 1051 if (dbghelp == NULL) { 1052 jio_fprintf(stderr, "Failed to load dbghelp.dll\n"); 1053 CloseHandle(dumpFile); 1054 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1055 } 1056 1057 _MiniDumpWriteDump = 1058 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 1059 PMINIDUMP_EXCEPTION_INFORMATION, 1060 PMINIDUMP_USER_STREAM_INFORMATION, 1061 PMINIDUMP_CALLBACK_INFORMATION), 1062 GetProcAddress(dbghelp, 1063 "MiniDumpWriteDump")); 1064 1065 if (_MiniDumpWriteDump == NULL) { 1066 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n"); 1067 CloseHandle(dumpFile); 1068 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1069 } 1070 1071 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData); 1072 1073 // Older versions of dbghelp.h do not contain all the dumptypes we want, dbghelp.h with 1074 // API_VERSION_NUMBER 11 or higher contains the ones we want though 1075#if API_VERSION_NUMBER >= 11 1076 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | 1077 MiniDumpWithUnloadedModules); 1078#endif 1079 1080 if (siginfo != NULL && context != NULL) { 1081 ep.ContextRecord = (PCONTEXT) context; 1082 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo; 1083 1084 mei.ThreadId = GetCurrentThreadId(); 1085 mei.ExceptionPointers = &ep; 1086 pmei = &mei; 1087 } else { 1088 pmei = NULL; 1089 } 1090 1091 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all 1092 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then. 1093 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false && 1094 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) { 1095 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError()); 1096 } 1097 CloseHandle(dumpFile); 1098 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1099} 1100 1101// Die immediately, no exit hook, no abort hook, no cleanup. 1102void os::die() { 1103 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1); 1104} 1105 1106// Directory routines copied from src/win32/native/java/io/dirent_md.c 1107// * dirent_md.c 1.15 00/02/02 1108// 1109// The declarations for DIR and struct dirent are in jvm_win32.h. 1110 1111// Caller must have already run dirname through JVM_NativePath, which removes 1112// duplicate slashes and converts all instances of '/' into '\\'. 1113 1114DIR * os::opendir(const char *dirname) { 1115 assert(dirname != NULL, "just checking"); // hotspot change 1116 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal); 1117 DWORD fattr; // hotspot change 1118 char alt_dirname[4] = { 0, 0, 0, 0 }; 1119 1120 if (dirp == 0) { 1121 errno = ENOMEM; 1122 return 0; 1123 } 1124 1125 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it 1126 // as a directory in FindFirstFile(). We detect this case here and 1127 // prepend the current drive name. 1128 // 1129 if (dirname[1] == '\0' && dirname[0] == '\\') { 1130 alt_dirname[0] = _getdrive() + 'A' - 1; 1131 alt_dirname[1] = ':'; 1132 alt_dirname[2] = '\\'; 1133 alt_dirname[3] = '\0'; 1134 dirname = alt_dirname; 1135 } 1136 1137 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal); 1138 if (dirp->path == 0) { 1139 free(dirp); 1140 errno = ENOMEM; 1141 return 0; 1142 } 1143 strcpy(dirp->path, dirname); 1144 1145 fattr = GetFileAttributes(dirp->path); 1146 if (fattr == 0xffffffff) { 1147 free(dirp->path); 1148 free(dirp); 1149 errno = ENOENT; 1150 return 0; 1151 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 1152 free(dirp->path); 1153 free(dirp); 1154 errno = ENOTDIR; 1155 return 0; 1156 } 1157 1158 // Append "*.*", or possibly "\\*.*", to path 1159 if (dirp->path[1] == ':' && 1160 (dirp->path[2] == '\0' || 1161 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 1162 // No '\\' needed for cases like "Z:" or "Z:\" 1163 strcat(dirp->path, "*.*"); 1164 } else { 1165 strcat(dirp->path, "\\*.*"); 1166 } 1167 1168 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 1169 if (dirp->handle == INVALID_HANDLE_VALUE) { 1170 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 1171 free(dirp->path); 1172 free(dirp); 1173 errno = EACCES; 1174 return 0; 1175 } 1176 } 1177 return dirp; 1178} 1179 1180// parameter dbuf unused on Windows 1181struct dirent * os::readdir(DIR *dirp, dirent *dbuf) { 1182 assert(dirp != NULL, "just checking"); // hotspot change 1183 if (dirp->handle == INVALID_HANDLE_VALUE) { 1184 return 0; 1185 } 1186 1187 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 1188 1189 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 1190 if (GetLastError() == ERROR_INVALID_HANDLE) { 1191 errno = EBADF; 1192 return 0; 1193 } 1194 FindClose(dirp->handle); 1195 dirp->handle = INVALID_HANDLE_VALUE; 1196 } 1197 1198 return &dirp->dirent; 1199} 1200 1201int os::closedir(DIR *dirp) { 1202 assert(dirp != NULL, "just checking"); // hotspot change 1203 if (dirp->handle != INVALID_HANDLE_VALUE) { 1204 if (!FindClose(dirp->handle)) { 1205 errno = EBADF; 1206 return -1; 1207 } 1208 dirp->handle = INVALID_HANDLE_VALUE; 1209 } 1210 free(dirp->path); 1211 free(dirp); 1212 return 0; 1213} 1214 1215// This must be hard coded because it's the system's temporary 1216// directory not the java application's temp directory, ala java.io.tmpdir. 1217const char* os::get_temp_directory() { 1218 static char path_buf[MAX_PATH]; 1219 if (GetTempPath(MAX_PATH, path_buf) > 0) { 1220 return path_buf; 1221 } else { 1222 path_buf[0] = '\0'; 1223 return path_buf; 1224 } 1225} 1226 1227static bool file_exists(const char* filename) { 1228 if (filename == NULL || strlen(filename) == 0) { 1229 return false; 1230 } 1231 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES; 1232} 1233 1234bool os::dll_build_name(char *buffer, size_t buflen, 1235 const char* pname, const char* fname) { 1236 bool retval = false; 1237 const size_t pnamelen = pname ? strlen(pname) : 0; 1238 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0; 1239 1240 // Return error on buffer overflow. 1241 if (pnamelen + strlen(fname) + 10 > buflen) { 1242 return retval; 1243 } 1244 1245 if (pnamelen == 0) { 1246 jio_snprintf(buffer, buflen, "%s.dll", fname); 1247 retval = true; 1248 } else if (c == ':' || c == '\\') { 1249 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname); 1250 retval = true; 1251 } else if (strchr(pname, *os::path_separator()) != NULL) { 1252 int n; 1253 char** pelements = split_path(pname, &n); 1254 if (pelements == NULL) { 1255 return false; 1256 } 1257 for (int i = 0; i < n; i++) { 1258 char* path = pelements[i]; 1259 // Really shouldn't be NULL, but check can't hurt 1260 size_t plen = (path == NULL) ? 0 : strlen(path); 1261 if (plen == 0) { 1262 continue; // skip the empty path values 1263 } 1264 const char lastchar = path[plen - 1]; 1265 if (lastchar == ':' || lastchar == '\\') { 1266 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname); 1267 } else { 1268 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname); 1269 } 1270 if (file_exists(buffer)) { 1271 retval = true; 1272 break; 1273 } 1274 } 1275 // release the storage 1276 for (int i = 0; i < n; i++) { 1277 if (pelements[i] != NULL) { 1278 FREE_C_HEAP_ARRAY(char, pelements[i]); 1279 } 1280 } 1281 if (pelements != NULL) { 1282 FREE_C_HEAP_ARRAY(char*, pelements); 1283 } 1284 } else { 1285 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname); 1286 retval = true; 1287 } 1288 return retval; 1289} 1290 1291// Needs to be in os specific directory because windows requires another 1292// header file <direct.h> 1293const char* os::get_current_directory(char *buf, size_t buflen) { 1294 int n = static_cast<int>(buflen); 1295 if (buflen > INT_MAX) n = INT_MAX; 1296 return _getcwd(buf, n); 1297} 1298 1299//----------------------------------------------------------- 1300// Helper functions for fatal error handler 1301#ifdef _WIN64 1302// Helper routine which returns true if address in 1303// within the NTDLL address space. 1304// 1305static bool _addr_in_ntdll(address addr) { 1306 HMODULE hmod; 1307 MODULEINFO minfo; 1308 1309 hmod = GetModuleHandle("NTDLL.DLL"); 1310 if (hmod == NULL) return false; 1311 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod, 1312 &minfo, sizeof(MODULEINFO))) { 1313 return false; 1314 } 1315 1316 if ((addr >= minfo.lpBaseOfDll) && 1317 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) { 1318 return true; 1319 } else { 1320 return false; 1321 } 1322} 1323#endif 1324 1325struct _modinfo { 1326 address addr; 1327 char* full_path; // point to a char buffer 1328 int buflen; // size of the buffer 1329 address base_addr; 1330}; 1331 1332static int _locate_module_by_addr(const char * mod_fname, address base_addr, 1333 address top_address, void * param) { 1334 struct _modinfo *pmod = (struct _modinfo *)param; 1335 if (!pmod) return -1; 1336 1337 if (base_addr <= pmod->addr && 1338 top_address > pmod->addr) { 1339 // if a buffer is provided, copy path name to the buffer 1340 if (pmod->full_path) { 1341 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1342 } 1343 pmod->base_addr = base_addr; 1344 return 1; 1345 } 1346 return 0; 1347} 1348 1349bool os::dll_address_to_library_name(address addr, char* buf, 1350 int buflen, int* offset) { 1351 // buf is not optional, but offset is optional 1352 assert(buf != NULL, "sanity check"); 1353 1354// NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1355// return the full path to the DLL file, sometimes it returns path 1356// to the corresponding PDB file (debug info); sometimes it only 1357// returns partial path, which makes life painful. 1358 1359 struct _modinfo mi; 1360 mi.addr = addr; 1361 mi.full_path = buf; 1362 mi.buflen = buflen; 1363 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) { 1364 // buf already contains path name 1365 if (offset) *offset = addr - mi.base_addr; 1366 return true; 1367 } 1368 1369 buf[0] = '\0'; 1370 if (offset) *offset = -1; 1371 return false; 1372} 1373 1374bool os::dll_address_to_function_name(address addr, char *buf, 1375 int buflen, int *offset, 1376 bool demangle) { 1377 // buf is not optional, but offset is optional 1378 assert(buf != NULL, "sanity check"); 1379 1380 if (Decoder::decode(addr, buf, buflen, offset, demangle)) { 1381 return true; 1382 } 1383 if (offset != NULL) *offset = -1; 1384 buf[0] = '\0'; 1385 return false; 1386} 1387 1388// save the start and end address of jvm.dll into param[0] and param[1] 1389static int _locate_jvm_dll(const char* mod_fname, address base_addr, 1390 address top_address, void * param) { 1391 if (!param) return -1; 1392 1393 if (base_addr <= (address)_locate_jvm_dll && 1394 top_address > (address)_locate_jvm_dll) { 1395 ((address*)param)[0] = base_addr; 1396 ((address*)param)[1] = top_address; 1397 return 1; 1398 } 1399 return 0; 1400} 1401 1402address vm_lib_location[2]; // start and end address of jvm.dll 1403 1404// check if addr is inside jvm.dll 1405bool os::address_is_in_vm(address addr) { 1406 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1407 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) { 1408 assert(false, "Can't find jvm module."); 1409 return false; 1410 } 1411 } 1412 1413 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1414} 1415 1416// print module info; param is outputStream* 1417static int _print_module(const char* fname, address base_address, 1418 address top_address, void* param) { 1419 if (!param) return -1; 1420 1421 outputStream* st = (outputStream*)param; 1422 1423 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname); 1424 return 0; 1425} 1426 1427// Loads .dll/.so and 1428// in case of error it checks if .dll/.so was built for the 1429// same architecture as Hotspot is running on 1430void * os::dll_load(const char *name, char *ebuf, int ebuflen) { 1431 void * result = LoadLibrary(name); 1432 if (result != NULL) { 1433 return result; 1434 } 1435 1436 DWORD errcode = GetLastError(); 1437 if (errcode == ERROR_MOD_NOT_FOUND) { 1438 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1); 1439 ebuf[ebuflen - 1] = '\0'; 1440 return NULL; 1441 } 1442 1443 // Parsing dll below 1444 // If we can read dll-info and find that dll was built 1445 // for an architecture other than Hotspot is running in 1446 // - then print to buffer "DLL was built for a different architecture" 1447 // else call os::lasterror to obtain system error message 1448 1449 // Read system error message into ebuf 1450 // It may or may not be overwritten below (in the for loop and just above) 1451 lasterror(ebuf, (size_t) ebuflen); 1452 ebuf[ebuflen - 1] = '\0'; 1453 int fd = ::open(name, O_RDONLY | O_BINARY, 0); 1454 if (fd < 0) { 1455 return NULL; 1456 } 1457 1458 uint32_t signature_offset; 1459 uint16_t lib_arch = 0; 1460 bool failed_to_get_lib_arch = 1461 ( // Go to position 3c in the dll 1462 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0) 1463 || 1464 // Read location of signature 1465 (sizeof(signature_offset) != 1466 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset)))) 1467 || 1468 // Go to COFF File Header in dll 1469 // that is located after "signature" (4 bytes long) 1470 (os::seek_to_file_offset(fd, 1471 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0) 1472 || 1473 // Read field that contains code of architecture 1474 // that dll was built for 1475 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch)))) 1476 ); 1477 1478 ::close(fd); 1479 if (failed_to_get_lib_arch) { 1480 // file i/o error - report os::lasterror(...) msg 1481 return NULL; 1482 } 1483 1484 typedef struct { 1485 uint16_t arch_code; 1486 char* arch_name; 1487 } arch_t; 1488 1489 static const arch_t arch_array[] = { 1490 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1491 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1492 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1493 }; 1494#if (defined _M_IA64) 1495 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64; 1496#elif (defined _M_AMD64) 1497 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64; 1498#elif (defined _M_IX86) 1499 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386; 1500#else 1501 #error Method os::dll_load requires that one of following \ 1502 is defined :_M_IA64,_M_AMD64 or _M_IX86 1503#endif 1504 1505 1506 // Obtain a string for printf operation 1507 // lib_arch_str shall contain string what platform this .dll was built for 1508 // running_arch_str shall string contain what platform Hotspot was built for 1509 char *running_arch_str = NULL, *lib_arch_str = NULL; 1510 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) { 1511 if (lib_arch == arch_array[i].arch_code) { 1512 lib_arch_str = arch_array[i].arch_name; 1513 } 1514 if (running_arch == arch_array[i].arch_code) { 1515 running_arch_str = arch_array[i].arch_name; 1516 } 1517 } 1518 1519 assert(running_arch_str, 1520 "Didn't find running architecture code in arch_array"); 1521 1522 // If the architecture is right 1523 // but some other error took place - report os::lasterror(...) msg 1524 if (lib_arch == running_arch) { 1525 return NULL; 1526 } 1527 1528 if (lib_arch_str != NULL) { 1529 ::_snprintf(ebuf, ebuflen - 1, 1530 "Can't load %s-bit .dll on a %s-bit platform", 1531 lib_arch_str, running_arch_str); 1532 } else { 1533 // don't know what architecture this dll was build for 1534 ::_snprintf(ebuf, ebuflen - 1, 1535 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1536 lib_arch, running_arch_str); 1537 } 1538 1539 return NULL; 1540} 1541 1542void os::print_dll_info(outputStream *st) { 1543 st->print_cr("Dynamic libraries:"); 1544 get_loaded_modules_info(_print_module, (void *)st); 1545} 1546 1547int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1548 HANDLE hProcess; 1549 1550# define MAX_NUM_MODULES 128 1551 HMODULE modules[MAX_NUM_MODULES]; 1552 static char filename[MAX_PATH]; 1553 int result = 0; 1554 1555 if (!os::PSApiDll::PSApiAvailable()) { 1556 return 0; 1557 } 1558 1559 int pid = os::current_process_id(); 1560 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1561 FALSE, pid); 1562 if (hProcess == NULL) return 0; 1563 1564 DWORD size_needed; 1565 if (!os::PSApiDll::EnumProcessModules(hProcess, modules, 1566 sizeof(modules), &size_needed)) { 1567 CloseHandle(hProcess); 1568 return 0; 1569 } 1570 1571 // number of modules that are currently loaded 1572 int num_modules = size_needed / sizeof(HMODULE); 1573 1574 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1575 // Get Full pathname: 1576 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i], 1577 filename, sizeof(filename))) { 1578 filename[0] = '\0'; 1579 } 1580 1581 MODULEINFO modinfo; 1582 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i], 1583 &modinfo, sizeof(modinfo))) { 1584 modinfo.lpBaseOfDll = NULL; 1585 modinfo.SizeOfImage = 0; 1586 } 1587 1588 // Invoke callback function 1589 result = callback(filename, (address)modinfo.lpBaseOfDll, 1590 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param); 1591 if (result) break; 1592 } 1593 1594 CloseHandle(hProcess); 1595 return result; 1596} 1597 1598#ifndef PRODUCT 1599bool os::get_host_name(char* buf, size_t buflen) { 1600 DWORD size = (DWORD)buflen; 1601 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE); 1602} 1603#endif // PRODUCT 1604 1605void os::get_summary_os_info(char* buf, size_t buflen) { 1606 stringStream sst(buf, buflen); 1607 os::win32::print_windows_version(&sst); 1608 // chop off newline character 1609 char* nl = strchr(buf, '\n'); 1610 if (nl != NULL) *nl = '\0'; 1611} 1612 1613int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) { 1614 int ret = vsnprintf(buf, len, fmt, args); 1615 // Get the correct buffer size if buf is too small 1616 if (ret < 0) { 1617 return _vscprintf(fmt, args); 1618 } 1619 return ret; 1620} 1621 1622void os::print_os_info_brief(outputStream* st) { 1623 os::print_os_info(st); 1624} 1625 1626void os::print_os_info(outputStream* st) { 1627#ifdef ASSERT 1628 char buffer[1024]; 1629 st->print("HostName: "); 1630 if (get_host_name(buffer, sizeof(buffer))) { 1631 st->print("%s ", buffer); 1632 } else { 1633 st->print("N/A "); 1634 } 1635#endif 1636 st->print("OS:"); 1637 os::win32::print_windows_version(st); 1638} 1639 1640void os::win32::print_windows_version(outputStream* st) { 1641 OSVERSIONINFOEX osvi; 1642 VS_FIXEDFILEINFO *file_info; 1643 TCHAR kernel32_path[MAX_PATH]; 1644 UINT len, ret; 1645 1646 // Use the GetVersionEx information to see if we're on a server or 1647 // workstation edition of Windows. Starting with Windows 8.1 we can't 1648 // trust the OS version information returned by this API. 1649 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1650 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1651 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1652 st->print_cr("Call to GetVersionEx failed"); 1653 return; 1654 } 1655 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION); 1656 1657 // Get the full path to \Windows\System32\kernel32.dll and use that for 1658 // determining what version of Windows we're running on. 1659 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1; 1660 ret = GetSystemDirectory(kernel32_path, len); 1661 if (ret == 0 || ret > len) { 1662 st->print_cr("Call to GetSystemDirectory failed"); 1663 return; 1664 } 1665 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret); 1666 1667 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL); 1668 if (version_size == 0) { 1669 st->print_cr("Call to GetFileVersionInfoSize failed"); 1670 return; 1671 } 1672 1673 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal); 1674 if (version_info == NULL) { 1675 st->print_cr("Failed to allocate version_info"); 1676 return; 1677 } 1678 1679 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) { 1680 os::free(version_info); 1681 st->print_cr("Call to GetFileVersionInfo failed"); 1682 return; 1683 } 1684 1685 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) { 1686 os::free(version_info); 1687 st->print_cr("Call to VerQueryValue failed"); 1688 return; 1689 } 1690 1691 int major_version = HIWORD(file_info->dwProductVersionMS); 1692 int minor_version = LOWORD(file_info->dwProductVersionMS); 1693 int build_number = HIWORD(file_info->dwProductVersionLS); 1694 int build_minor = LOWORD(file_info->dwProductVersionLS); 1695 int os_vers = major_version * 1000 + minor_version; 1696 os::free(version_info); 1697 1698 st->print(" Windows "); 1699 switch (os_vers) { 1700 1701 case 6000: 1702 if (is_workstation) { 1703 st->print("Vista"); 1704 } else { 1705 st->print("Server 2008"); 1706 } 1707 break; 1708 1709 case 6001: 1710 if (is_workstation) { 1711 st->print("7"); 1712 } else { 1713 st->print("Server 2008 R2"); 1714 } 1715 break; 1716 1717 case 6002: 1718 if (is_workstation) { 1719 st->print("8"); 1720 } else { 1721 st->print("Server 2012"); 1722 } 1723 break; 1724 1725 case 6003: 1726 if (is_workstation) { 1727 st->print("8.1"); 1728 } else { 1729 st->print("Server 2012 R2"); 1730 } 1731 break; 1732 1733 case 10000: 1734 if (is_workstation) { 1735 st->print("10"); 1736 } else { 1737 // The server version name of Windows 10 is not known at this time 1738 st->print("%d.%d", major_version, minor_version); 1739 } 1740 break; 1741 1742 default: 1743 // Unrecognized windows, print out its major and minor versions 1744 st->print("%d.%d", major_version, minor_version); 1745 break; 1746 } 1747 1748 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1749 // find out whether we are running on 64 bit processor or not 1750 SYSTEM_INFO si; 1751 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1752 os::Kernel32Dll::GetNativeSystemInfo(&si); 1753 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1754 st->print(" , 64 bit"); 1755 } 1756 1757 st->print(" Build %d", build_number); 1758 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor); 1759 st->cr(); 1760} 1761 1762void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1763 // Nothing to do for now. 1764} 1765 1766void os::get_summary_cpu_info(char* buf, size_t buflen) { 1767 HKEY key; 1768 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE, 1769 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key); 1770 if (status == ERROR_SUCCESS) { 1771 DWORD size = (DWORD)buflen; 1772 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size); 1773 if (status != ERROR_SUCCESS) { 1774 strncpy(buf, "## __CPU__", buflen); 1775 } 1776 RegCloseKey(key); 1777 } else { 1778 // Put generic cpu info to return 1779 strncpy(buf, "## __CPU__", buflen); 1780 } 1781} 1782 1783void os::print_memory_info(outputStream* st) { 1784 st->print("Memory:"); 1785 st->print(" %dk page", os::vm_page_size()>>10); 1786 1787 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1788 // value if total memory is larger than 4GB 1789 MEMORYSTATUSEX ms; 1790 ms.dwLength = sizeof(ms); 1791 GlobalMemoryStatusEx(&ms); 1792 1793 st->print(", physical %uk", os::physical_memory() >> 10); 1794 st->print("(%uk free)", os::available_memory() >> 10); 1795 1796 st->print(", swap %uk", ms.ullTotalPageFile >> 10); 1797 st->print("(%uk free)", ms.ullAvailPageFile >> 10); 1798 st->cr(); 1799} 1800 1801void os::print_siginfo(outputStream *st, void *siginfo) { 1802 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1803 st->print("siginfo:"); 1804 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1805 1806 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1807 er->NumberParameters >= 2) { 1808 switch (er->ExceptionInformation[0]) { 1809 case 0: st->print(", reading address"); break; 1810 case 1: st->print(", writing address"); break; 1811 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1812 er->ExceptionInformation[0]); 1813 } 1814 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1815 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1816 er->NumberParameters >= 2 && UseSharedSpaces) { 1817 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1818 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1819 st->print("\n\nError accessing class data sharing archive." \ 1820 " Mapped file inaccessible during execution, " \ 1821 " possible disk/network problem."); 1822 } 1823 } else { 1824 int num = er->NumberParameters; 1825 if (num > 0) { 1826 st->print(", ExceptionInformation="); 1827 for (int i = 0; i < num; i++) { 1828 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1829 } 1830 } 1831 } 1832 st->cr(); 1833} 1834 1835void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1836 // do nothing 1837} 1838 1839static char saved_jvm_path[MAX_PATH] = {0}; 1840 1841// Find the full path to the current module, jvm.dll 1842void os::jvm_path(char *buf, jint buflen) { 1843 // Error checking. 1844 if (buflen < MAX_PATH) { 1845 assert(false, "must use a large-enough buffer"); 1846 buf[0] = '\0'; 1847 return; 1848 } 1849 // Lazy resolve the path to current module. 1850 if (saved_jvm_path[0] != 0) { 1851 strcpy(buf, saved_jvm_path); 1852 return; 1853 } 1854 1855 buf[0] = '\0'; 1856 if (Arguments::sun_java_launcher_is_altjvm()) { 1857 // Support for the java launcher's '-XXaltjvm=<path>' option. Check 1858 // for a JAVA_HOME environment variable and fix up the path so it 1859 // looks like jvm.dll is installed there (append a fake suffix 1860 // hotspot/jvm.dll). 1861 char* java_home_var = ::getenv("JAVA_HOME"); 1862 if (java_home_var != NULL && java_home_var[0] != 0 && 1863 strlen(java_home_var) < (size_t)buflen) { 1864 strncpy(buf, java_home_var, buflen); 1865 1866 // determine if this is a legacy image or modules image 1867 // modules image doesn't have "jre" subdirectory 1868 size_t len = strlen(buf); 1869 char* jrebin_p = buf + len; 1870 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1871 if (0 != _access(buf, 0)) { 1872 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1873 } 1874 len = strlen(buf); 1875 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1876 } 1877 } 1878 1879 if (buf[0] == '\0') { 1880 GetModuleFileName(vm_lib_handle, buf, buflen); 1881 } 1882 strncpy(saved_jvm_path, buf, MAX_PATH); 1883 saved_jvm_path[MAX_PATH - 1] = '\0'; 1884} 1885 1886 1887void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1888#ifndef _WIN64 1889 st->print("_"); 1890#endif 1891} 1892 1893 1894void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1895#ifndef _WIN64 1896 st->print("@%d", args_size * sizeof(int)); 1897#endif 1898} 1899 1900// This method is a copy of JDK's sysGetLastErrorString 1901// from src/windows/hpi/src/system_md.c 1902 1903size_t os::lasterror(char* buf, size_t len) { 1904 DWORD errval; 1905 1906 if ((errval = GetLastError()) != 0) { 1907 // DOS error 1908 size_t n = (size_t)FormatMessage( 1909 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1910 NULL, 1911 errval, 1912 0, 1913 buf, 1914 (DWORD)len, 1915 NULL); 1916 if (n > 3) { 1917 // Drop final '.', CR, LF 1918 if (buf[n - 1] == '\n') n--; 1919 if (buf[n - 1] == '\r') n--; 1920 if (buf[n - 1] == '.') n--; 1921 buf[n] = '\0'; 1922 } 1923 return n; 1924 } 1925 1926 if (errno != 0) { 1927 // C runtime error that has no corresponding DOS error code 1928 const char* s = strerror(errno); 1929 size_t n = strlen(s); 1930 if (n >= len) n = len - 1; 1931 strncpy(buf, s, n); 1932 buf[n] = '\0'; 1933 return n; 1934 } 1935 1936 return 0; 1937} 1938 1939int os::get_last_error() { 1940 DWORD error = GetLastError(); 1941 if (error == 0) { 1942 error = errno; 1943 } 1944 return (int)error; 1945} 1946 1947WindowsSemaphore::WindowsSemaphore(uint value) { 1948 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL); 1949 1950 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError()); 1951} 1952 1953WindowsSemaphore::~WindowsSemaphore() { 1954 ::CloseHandle(_semaphore); 1955} 1956 1957void WindowsSemaphore::signal(uint count) { 1958 if (count > 0) { 1959 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL); 1960 1961 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError()); 1962 } 1963} 1964 1965void WindowsSemaphore::wait() { 1966 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE); 1967 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError()); 1968 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret); 1969} 1970 1971// sun.misc.Signal 1972// NOTE that this is a workaround for an apparent kernel bug where if 1973// a signal handler for SIGBREAK is installed then that signal handler 1974// takes priority over the console control handler for CTRL_CLOSE_EVENT. 1975// See bug 4416763. 1976static void (*sigbreakHandler)(int) = NULL; 1977 1978static void UserHandler(int sig, void *siginfo, void *context) { 1979 os::signal_notify(sig); 1980 // We need to reinstate the signal handler each time... 1981 os::signal(sig, (void*)UserHandler); 1982} 1983 1984void* os::user_handler() { 1985 return (void*) UserHandler; 1986} 1987 1988void* os::signal(int signal_number, void* handler) { 1989 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1990 void (*oldHandler)(int) = sigbreakHandler; 1991 sigbreakHandler = (void (*)(int)) handler; 1992 return (void*) oldHandler; 1993 } else { 1994 return (void*)::signal(signal_number, (void (*)(int))handler); 1995 } 1996} 1997 1998void os::signal_raise(int signal_number) { 1999 raise(signal_number); 2000} 2001 2002// The Win32 C runtime library maps all console control events other than ^C 2003// into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 2004// logoff, and shutdown events. We therefore install our own console handler 2005// that raises SIGTERM for the latter cases. 2006// 2007static BOOL WINAPI consoleHandler(DWORD event) { 2008 switch (event) { 2009 case CTRL_C_EVENT: 2010 if (is_error_reported()) { 2011 // Ctrl-C is pressed during error reporting, likely because the error 2012 // handler fails to abort. Let VM die immediately. 2013 os::die(); 2014 } 2015 2016 os::signal_raise(SIGINT); 2017 return TRUE; 2018 break; 2019 case CTRL_BREAK_EVENT: 2020 if (sigbreakHandler != NULL) { 2021 (*sigbreakHandler)(SIGBREAK); 2022 } 2023 return TRUE; 2024 break; 2025 case CTRL_LOGOFF_EVENT: { 2026 // Don't terminate JVM if it is running in a non-interactive session, 2027 // such as a service process. 2028 USEROBJECTFLAGS flags; 2029 HANDLE handle = GetProcessWindowStation(); 2030 if (handle != NULL && 2031 GetUserObjectInformation(handle, UOI_FLAGS, &flags, 2032 sizeof(USEROBJECTFLAGS), NULL)) { 2033 // If it is a non-interactive session, let next handler to deal 2034 // with it. 2035 if ((flags.dwFlags & WSF_VISIBLE) == 0) { 2036 return FALSE; 2037 } 2038 } 2039 } 2040 case CTRL_CLOSE_EVENT: 2041 case CTRL_SHUTDOWN_EVENT: 2042 os::signal_raise(SIGTERM); 2043 return TRUE; 2044 break; 2045 default: 2046 break; 2047 } 2048 return FALSE; 2049} 2050 2051// The following code is moved from os.cpp for making this 2052// code platform specific, which it is by its very nature. 2053 2054// Return maximum OS signal used + 1 for internal use only 2055// Used as exit signal for signal_thread 2056int os::sigexitnum_pd() { 2057 return NSIG; 2058} 2059 2060// a counter for each possible signal value, including signal_thread exit signal 2061static volatile jint pending_signals[NSIG+1] = { 0 }; 2062static HANDLE sig_sem = NULL; 2063 2064void os::signal_init_pd() { 2065 // Initialize signal structures 2066 memset((void*)pending_signals, 0, sizeof(pending_signals)); 2067 2068 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 2069 2070 // Programs embedding the VM do not want it to attempt to receive 2071 // events like CTRL_LOGOFF_EVENT, which are used to implement the 2072 // shutdown hooks mechanism introduced in 1.3. For example, when 2073 // the VM is run as part of a Windows NT service (i.e., a servlet 2074 // engine in a web server), the correct behavior is for any console 2075 // control handler to return FALSE, not TRUE, because the OS's 2076 // "final" handler for such events allows the process to continue if 2077 // it is a service (while terminating it if it is not a service). 2078 // To make this behavior uniform and the mechanism simpler, we 2079 // completely disable the VM's usage of these console events if -Xrs 2080 // (=ReduceSignalUsage) is specified. This means, for example, that 2081 // the CTRL-BREAK thread dump mechanism is also disabled in this 2082 // case. See bugs 4323062, 4345157, and related bugs. 2083 2084 if (!ReduceSignalUsage) { 2085 // Add a CTRL-C handler 2086 SetConsoleCtrlHandler(consoleHandler, TRUE); 2087 } 2088} 2089 2090void os::signal_notify(int signal_number) { 2091 BOOL ret; 2092 if (sig_sem != NULL) { 2093 Atomic::inc(&pending_signals[signal_number]); 2094 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2095 assert(ret != 0, "ReleaseSemaphore() failed"); 2096 } 2097} 2098 2099static int check_pending_signals(bool wait_for_signal) { 2100 DWORD ret; 2101 while (true) { 2102 for (int i = 0; i < NSIG + 1; i++) { 2103 jint n = pending_signals[i]; 2104 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2105 return i; 2106 } 2107 } 2108 if (!wait_for_signal) { 2109 return -1; 2110 } 2111 2112 JavaThread *thread = JavaThread::current(); 2113 2114 ThreadBlockInVM tbivm(thread); 2115 2116 bool threadIsSuspended; 2117 do { 2118 thread->set_suspend_equivalent(); 2119 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2120 ret = ::WaitForSingleObject(sig_sem, INFINITE); 2121 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 2122 2123 // were we externally suspended while we were waiting? 2124 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2125 if (threadIsSuspended) { 2126 // The semaphore has been incremented, but while we were waiting 2127 // another thread suspended us. We don't want to continue running 2128 // while suspended because that would surprise the thread that 2129 // suspended us. 2130 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2131 assert(ret != 0, "ReleaseSemaphore() failed"); 2132 2133 thread->java_suspend_self(); 2134 } 2135 } while (threadIsSuspended); 2136 } 2137} 2138 2139int os::signal_lookup() { 2140 return check_pending_signals(false); 2141} 2142 2143int os::signal_wait() { 2144 return check_pending_signals(true); 2145} 2146 2147// Implicit OS exception handling 2148 2149LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, 2150 address handler) { 2151 JavaThread* thread = (JavaThread*) Thread::current_or_null(); 2152 // Save pc in thread 2153#ifdef _M_IA64 2154 // Do not blow up if no thread info available. 2155 if (thread) { 2156 // Saving PRECISE pc (with slot information) in thread. 2157 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress; 2158 // Convert precise PC into "Unix" format 2159 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2); 2160 thread->set_saved_exception_pc((address)precise_pc); 2161 } 2162 // Set pc to handler 2163 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 2164 // Clear out psr.ri (= Restart Instruction) in order to continue 2165 // at the beginning of the target bundle. 2166 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF; 2167 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!"); 2168#else 2169 #ifdef _M_AMD64 2170 // Do not blow up if no thread info available. 2171 if (thread) { 2172 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip); 2173 } 2174 // Set pc to handler 2175 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 2176 #else 2177 // Do not blow up if no thread info available. 2178 if (thread) { 2179 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip); 2180 } 2181 // Set pc to handler 2182 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler; 2183 #endif 2184#endif 2185 2186 // Continue the execution 2187 return EXCEPTION_CONTINUE_EXECUTION; 2188} 2189 2190 2191// Used for PostMortemDump 2192extern "C" void safepoints(); 2193extern "C" void find(int x); 2194extern "C" void events(); 2195 2196// According to Windows API documentation, an illegal instruction sequence should generate 2197// the 0xC000001C exception code. However, real world experience shows that occasionnaly 2198// the execution of an illegal instruction can generate the exception code 0xC000001E. This 2199// seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 2200 2201#define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 2202 2203// From "Execution Protection in the Windows Operating System" draft 0.35 2204// Once a system header becomes available, the "real" define should be 2205// included or copied here. 2206#define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2207 2208// Handle NAT Bit consumption on IA64. 2209#ifdef _M_IA64 2210 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION 2211#endif 2212 2213// Windows Vista/2008 heap corruption check 2214#define EXCEPTION_HEAP_CORRUPTION 0xC0000374 2215 2216#define def_excpt(val) #val, val 2217 2218struct siglabel { 2219 char *name; 2220 int number; 2221}; 2222 2223// All Visual C++ exceptions thrown from code generated by the Microsoft Visual 2224// C++ compiler contain this error code. Because this is a compiler-generated 2225// error, the code is not listed in the Win32 API header files. 2226// The code is actually a cryptic mnemonic device, with the initial "E" 2227// standing for "exception" and the final 3 bytes (0x6D7363) representing the 2228// ASCII values of "msc". 2229 2230#define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363 2231 2232 2233struct siglabel exceptlabels[] = { 2234 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2235 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2236 def_excpt(EXCEPTION_BREAKPOINT), 2237 def_excpt(EXCEPTION_SINGLE_STEP), 2238 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2239 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2240 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2241 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2242 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2243 def_excpt(EXCEPTION_FLT_OVERFLOW), 2244 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2245 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2246 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2247 def_excpt(EXCEPTION_INT_OVERFLOW), 2248 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2249 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2250 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2251 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2252 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2253 def_excpt(EXCEPTION_STACK_OVERFLOW), 2254 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2255 def_excpt(EXCEPTION_GUARD_PAGE), 2256 def_excpt(EXCEPTION_INVALID_HANDLE), 2257 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION), 2258 def_excpt(EXCEPTION_HEAP_CORRUPTION), 2259#ifdef _M_IA64 2260 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION), 2261#endif 2262 NULL, 0 2263}; 2264 2265const char* os::exception_name(int exception_code, char *buf, size_t size) { 2266 for (int i = 0; exceptlabels[i].name != NULL; i++) { 2267 if (exceptlabels[i].number == exception_code) { 2268 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2269 return buf; 2270 } 2271 } 2272 2273 return NULL; 2274} 2275 2276//----------------------------------------------------------------------------- 2277LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2278 // handle exception caused by idiv; should only happen for -MinInt/-1 2279 // (division by zero is handled explicitly) 2280#ifdef _M_IA64 2281 assert(0, "Fix Handle_IDiv_Exception"); 2282#else 2283 #ifdef _M_AMD64 2284 PCONTEXT ctx = exceptionInfo->ContextRecord; 2285 address pc = (address)ctx->Rip; 2286 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode"); 2287 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2288 if (pc[0] == 0xF7) { 2289 // set correct result values and continue after idiv instruction 2290 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes 2291 } else { 2292 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes 2293 } 2294 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation) 2295 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the 2296 // idiv opcode (0xF7). 2297 ctx->Rdx = (DWORD)0; // remainder 2298 // Continue the execution 2299 #else 2300 PCONTEXT ctx = exceptionInfo->ContextRecord; 2301 address pc = (address)ctx->Eip; 2302 assert(pc[0] == 0xF7, "not an idiv opcode"); 2303 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2304 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2305 // set correct result values and continue after idiv instruction 2306 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2307 ctx->Eax = (DWORD)min_jint; // result 2308 ctx->Edx = (DWORD)0; // remainder 2309 // Continue the execution 2310 #endif 2311#endif 2312 return EXCEPTION_CONTINUE_EXECUTION; 2313} 2314 2315//----------------------------------------------------------------------------- 2316LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2317 PCONTEXT ctx = exceptionInfo->ContextRecord; 2318#ifndef _WIN64 2319 // handle exception caused by native method modifying control word 2320 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2321 2322 switch (exception_code) { 2323 case EXCEPTION_FLT_DENORMAL_OPERAND: 2324 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2325 case EXCEPTION_FLT_INEXACT_RESULT: 2326 case EXCEPTION_FLT_INVALID_OPERATION: 2327 case EXCEPTION_FLT_OVERFLOW: 2328 case EXCEPTION_FLT_STACK_CHECK: 2329 case EXCEPTION_FLT_UNDERFLOW: 2330 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2331 if (fp_control_word != ctx->FloatSave.ControlWord) { 2332 // Restore FPCW and mask out FLT exceptions 2333 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2334 // Mask out pending FLT exceptions 2335 ctx->FloatSave.StatusWord &= 0xffffff00; 2336 return EXCEPTION_CONTINUE_EXECUTION; 2337 } 2338 } 2339 2340 if (prev_uef_handler != NULL) { 2341 // We didn't handle this exception so pass it to the previous 2342 // UnhandledExceptionFilter. 2343 return (prev_uef_handler)(exceptionInfo); 2344 } 2345#else // !_WIN64 2346 // On Windows, the mxcsr control bits are non-volatile across calls 2347 // See also CR 6192333 2348 // 2349 jint MxCsr = INITIAL_MXCSR; 2350 // we can't use StubRoutines::addr_mxcsr_std() 2351 // because in Win64 mxcsr is not saved there 2352 if (MxCsr != ctx->MxCsr) { 2353 ctx->MxCsr = MxCsr; 2354 return EXCEPTION_CONTINUE_EXECUTION; 2355 } 2356#endif // !_WIN64 2357 2358 return EXCEPTION_CONTINUE_SEARCH; 2359} 2360 2361static inline void report_error(Thread* t, DWORD exception_code, 2362 address addr, void* siginfo, void* context) { 2363 VMError::report_and_die(t, exception_code, addr, siginfo, context); 2364 2365 // If UseOsErrorReporting, this will return here and save the error file 2366 // somewhere where we can find it in the minidump. 2367} 2368 2369//----------------------------------------------------------------------------- 2370LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2371 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2372 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2373#ifdef _M_IA64 2374 // On Itanium, we need the "precise pc", which has the slot number coded 2375 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format). 2376 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress; 2377 // Convert the pc to "Unix format", which has the slot number coded 2378 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2 2379 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction" 2380 // information is saved in the Unix format. 2381 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2)); 2382#else 2383 #ifdef _M_AMD64 2384 address pc = (address) exceptionInfo->ContextRecord->Rip; 2385 #else 2386 address pc = (address) exceptionInfo->ContextRecord->Eip; 2387 #endif 2388#endif 2389 Thread* t = Thread::current_or_null_safe(); 2390 2391 // Handle SafeFetch32 and SafeFetchN exceptions. 2392 if (StubRoutines::is_safefetch_fault(pc)) { 2393 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc)); 2394 } 2395 2396#ifndef _WIN64 2397 // Execution protection violation - win32 running on AMD64 only 2398 // Handled first to avoid misdiagnosis as a "normal" access violation; 2399 // This is safe to do because we have a new/unique ExceptionInformation 2400 // code for this condition. 2401 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2402 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2403 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2404 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2405 2406 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2407 int page_size = os::vm_page_size(); 2408 2409 // Make sure the pc and the faulting address are sane. 2410 // 2411 // If an instruction spans a page boundary, and the page containing 2412 // the beginning of the instruction is executable but the following 2413 // page is not, the pc and the faulting address might be slightly 2414 // different - we still want to unguard the 2nd page in this case. 2415 // 2416 // 15 bytes seems to be a (very) safe value for max instruction size. 2417 bool pc_is_near_addr = 2418 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2419 bool instr_spans_page_boundary = 2420 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2421 (intptr_t) page_size) > 0); 2422 2423 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2424 static volatile address last_addr = 2425 (address) os::non_memory_address_word(); 2426 2427 // In conservative mode, don't unguard unless the address is in the VM 2428 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2429 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2430 2431 // Set memory to RWX and retry 2432 address page_start = 2433 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2434 bool res = os::protect_memory((char*) page_start, page_size, 2435 os::MEM_PROT_RWX); 2436 2437 if (PrintMiscellaneous && Verbose) { 2438 char buf[256]; 2439 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 2440 "at " INTPTR_FORMAT 2441 ", unguarding " INTPTR_FORMAT ": %s", addr, 2442 page_start, (res ? "success" : strerror(errno))); 2443 tty->print_raw_cr(buf); 2444 } 2445 2446 // Set last_addr so if we fault again at the same address, we don't 2447 // end up in an endless loop. 2448 // 2449 // There are two potential complications here. Two threads trapping 2450 // at the same address at the same time could cause one of the 2451 // threads to think it already unguarded, and abort the VM. Likely 2452 // very rare. 2453 // 2454 // The other race involves two threads alternately trapping at 2455 // different addresses and failing to unguard the page, resulting in 2456 // an endless loop. This condition is probably even more unlikely 2457 // than the first. 2458 // 2459 // Although both cases could be avoided by using locks or thread 2460 // local last_addr, these solutions are unnecessary complication: 2461 // this handler is a best-effort safety net, not a complete solution. 2462 // It is disabled by default and should only be used as a workaround 2463 // in case we missed any no-execute-unsafe VM code. 2464 2465 last_addr = addr; 2466 2467 return EXCEPTION_CONTINUE_EXECUTION; 2468 } 2469 } 2470 2471 // Last unguard failed or not unguarding 2472 tty->print_raw_cr("Execution protection violation"); 2473 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2474 exceptionInfo->ContextRecord); 2475 return EXCEPTION_CONTINUE_SEARCH; 2476 } 2477 } 2478#endif // _WIN64 2479 2480 // Check to see if we caught the safepoint code in the 2481 // process of write protecting the memory serialization page. 2482 // It write enables the page immediately after protecting it 2483 // so just return. 2484 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2485 JavaThread* thread = (JavaThread*) t; 2486 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2487 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2488 if (os::is_memory_serialize_page(thread, addr)) { 2489 // Block current thread until the memory serialize page permission restored. 2490 os::block_on_serialize_page_trap(); 2491 return EXCEPTION_CONTINUE_EXECUTION; 2492 } 2493 } 2494 2495 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) && 2496 VM_Version::is_cpuinfo_segv_addr(pc)) { 2497 // Verify that OS save/restore AVX registers. 2498 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr()); 2499 } 2500 2501 if (t != NULL && t->is_Java_thread()) { 2502 JavaThread* thread = (JavaThread*) t; 2503 bool in_java = thread->thread_state() == _thread_in_Java; 2504 2505 // Handle potential stack overflows up front. 2506 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2507 if (os::uses_stack_guard_pages()) { 2508#ifdef _M_IA64 2509 // Use guard page for register stack. 2510 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2511 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2512 // Check for a register stack overflow on Itanium 2513 if (thread->addr_inside_register_stack_red_zone(addr)) { 2514 // Fatal red zone violation happens if the Java program 2515 // catches a StackOverflow error and does so much processing 2516 // that it runs beyond the unprotected yellow guard zone. As 2517 // a result, we are out of here. 2518 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit."); 2519 } else if(thread->addr_inside_register_stack(addr)) { 2520 // Disable the yellow zone which sets the state that 2521 // we've got a stack overflow problem. 2522 if (thread->stack_yellow_zone_enabled()) { 2523 thread->disable_stack_yellow_zone(); 2524 } 2525 // Give us some room to process the exception. 2526 thread->disable_register_stack_guard(); 2527 // Tracing with +Verbose. 2528 if (Verbose) { 2529 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc); 2530 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr); 2531 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base()); 2532 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]", 2533 thread->register_stack_base(), 2534 thread->register_stack_base() + thread->stack_size()); 2535 } 2536 2537 // Reguard the permanent register stack red zone just to be sure. 2538 // We saw Windows silently disabling this without telling us. 2539 thread->enable_register_stack_red_zone(); 2540 2541 return Handle_Exception(exceptionInfo, 2542 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2543 } 2544#endif 2545 if (thread->stack_yellow_zone_enabled()) { 2546 // Yellow zone violation. The o/s has unprotected the first yellow 2547 // zone page for us. Note: must call disable_stack_yellow_zone to 2548 // update the enabled status, even if the zone contains only one page. 2549 thread->disable_stack_yellow_zone(); 2550 // If not in java code, return and hope for the best. 2551 return in_java 2552 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2553 : EXCEPTION_CONTINUE_EXECUTION; 2554 } else { 2555 // Fatal red zone violation. 2556 thread->disable_stack_red_zone(); 2557 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2558 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2559 exceptionInfo->ContextRecord); 2560 return EXCEPTION_CONTINUE_SEARCH; 2561 } 2562 } else if (in_java) { 2563 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2564 // a one-time-only guard page, which it has released to us. The next 2565 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2566 return Handle_Exception(exceptionInfo, 2567 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2568 } else { 2569 // Can only return and hope for the best. Further stack growth will 2570 // result in an ACCESS_VIOLATION. 2571 return EXCEPTION_CONTINUE_EXECUTION; 2572 } 2573 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2574 // Either stack overflow or null pointer exception. 2575 if (in_java) { 2576 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2577 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2578 address stack_end = thread->stack_base() - thread->stack_size(); 2579 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2580 // Stack overflow. 2581 assert(!os::uses_stack_guard_pages(), 2582 "should be caught by red zone code above."); 2583 return Handle_Exception(exceptionInfo, 2584 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2585 } 2586 // Check for safepoint polling and implicit null 2587 // We only expect null pointers in the stubs (vtable) 2588 // the rest are checked explicitly now. 2589 CodeBlob* cb = CodeCache::find_blob(pc); 2590 if (cb != NULL) { 2591 if (os::is_poll_address(addr)) { 2592 address stub = SharedRuntime::get_poll_stub(pc); 2593 return Handle_Exception(exceptionInfo, stub); 2594 } 2595 } 2596 { 2597#ifdef _WIN64 2598 // If it's a legal stack address map the entire region in 2599 // 2600 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2601 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2602 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) { 2603 addr = (address)((uintptr_t)addr & 2604 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2605 os::commit_memory((char *)addr, thread->stack_base() - addr, 2606 !ExecMem); 2607 return EXCEPTION_CONTINUE_EXECUTION; 2608 } else 2609#endif 2610 { 2611 // Null pointer exception. 2612#ifdef _M_IA64 2613 // Process implicit null checks in compiled code. Note: Implicit null checks 2614 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs. 2615 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) { 2616 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format); 2617 // Handle implicit null check in UEP method entry 2618 if (cb && (cb->is_frame_complete_at(pc) || 2619 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) { 2620 if (Verbose) { 2621 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0); 2622 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format); 2623 tty->print_cr(" to addr " INTPTR_FORMAT, addr); 2624 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)", 2625 *(bundle_start + 1), *bundle_start); 2626 } 2627 return Handle_Exception(exceptionInfo, 2628 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL)); 2629 } 2630 } 2631 2632 // Implicit null checks were processed above. Hence, we should not reach 2633 // here in the usual case => die! 2634 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception"); 2635 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2636 exceptionInfo->ContextRecord); 2637 return EXCEPTION_CONTINUE_SEARCH; 2638 2639#else // !IA64 2640 2641 // Windows 98 reports faulting addresses incorrectly 2642 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2643 !os::win32::is_nt()) { 2644 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2645 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2646 } 2647 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2648 exceptionInfo->ContextRecord); 2649 return EXCEPTION_CONTINUE_SEARCH; 2650#endif 2651 } 2652 } 2653 } 2654 2655#ifdef _WIN64 2656 // Special care for fast JNI field accessors. 2657 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2658 // in and the heap gets shrunk before the field access. 2659 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2660 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2661 if (addr != (address)-1) { 2662 return Handle_Exception(exceptionInfo, addr); 2663 } 2664 } 2665#endif 2666 2667 // Stack overflow or null pointer exception in native code. 2668 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2669 exceptionInfo->ContextRecord); 2670 return EXCEPTION_CONTINUE_SEARCH; 2671 } // /EXCEPTION_ACCESS_VIOLATION 2672 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2673#if defined _M_IA64 2674 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION || 2675 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) { 2676 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0); 2677 2678 // Compiled method patched to be non entrant? Following conditions must apply: 2679 // 1. must be first instruction in bundle 2680 // 2. must be a break instruction with appropriate code 2681 if ((((uint64_t) pc & 0x0F) == 0) && 2682 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) { 2683 return Handle_Exception(exceptionInfo, 2684 (address)SharedRuntime::get_handle_wrong_method_stub()); 2685 } 2686 } // /EXCEPTION_ILLEGAL_INSTRUCTION 2687#endif 2688 2689 2690 if (in_java) { 2691 switch (exception_code) { 2692 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2693 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2694 2695 case EXCEPTION_INT_OVERFLOW: 2696 return Handle_IDiv_Exception(exceptionInfo); 2697 2698 } // switch 2699 } 2700 if (((thread->thread_state() == _thread_in_Java) || 2701 (thread->thread_state() == _thread_in_native)) && 2702 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) { 2703 LONG result=Handle_FLT_Exception(exceptionInfo); 2704 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2705 } 2706 } 2707 2708 if (exception_code != EXCEPTION_BREAKPOINT) { 2709 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2710 exceptionInfo->ContextRecord); 2711 } 2712 return EXCEPTION_CONTINUE_SEARCH; 2713} 2714 2715#ifndef _WIN64 2716// Special care for fast JNI accessors. 2717// jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2718// the heap gets shrunk before the field access. 2719// Need to install our own structured exception handler since native code may 2720// install its own. 2721LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2722 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2723 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2724 address pc = (address) exceptionInfo->ContextRecord->Eip; 2725 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2726 if (addr != (address)-1) { 2727 return Handle_Exception(exceptionInfo, addr); 2728 } 2729 } 2730 return EXCEPTION_CONTINUE_SEARCH; 2731} 2732 2733#define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \ 2734 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \ 2735 jobject obj, \ 2736 jfieldID fieldID) { \ 2737 __try { \ 2738 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \ 2739 obj, \ 2740 fieldID); \ 2741 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \ 2742 _exception_info())) { \ 2743 } \ 2744 return 0; \ 2745 } 2746 2747DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2748DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2749DEFINE_FAST_GETFIELD(jchar, char, Char) 2750DEFINE_FAST_GETFIELD(jshort, short, Short) 2751DEFINE_FAST_GETFIELD(jint, int, Int) 2752DEFINE_FAST_GETFIELD(jlong, long, Long) 2753DEFINE_FAST_GETFIELD(jfloat, float, Float) 2754DEFINE_FAST_GETFIELD(jdouble, double, Double) 2755 2756address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2757 switch (type) { 2758 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2759 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2760 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2761 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2762 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2763 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2764 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2765 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2766 default: ShouldNotReachHere(); 2767 } 2768 return (address)-1; 2769} 2770#endif 2771 2772// Virtual Memory 2773 2774int os::vm_page_size() { return os::win32::vm_page_size(); } 2775int os::vm_allocation_granularity() { 2776 return os::win32::vm_allocation_granularity(); 2777} 2778 2779// Windows large page support is available on Windows 2003. In order to use 2780// large page memory, the administrator must first assign additional privilege 2781// to the user: 2782// + select Control Panel -> Administrative Tools -> Local Security Policy 2783// + select Local Policies -> User Rights Assignment 2784// + double click "Lock pages in memory", add users and/or groups 2785// + reboot 2786// Note the above steps are needed for administrator as well, as administrators 2787// by default do not have the privilege to lock pages in memory. 2788// 2789// Note about Windows 2003: although the API supports committing large page 2790// memory on a page-by-page basis and VirtualAlloc() returns success under this 2791// scenario, I found through experiment it only uses large page if the entire 2792// memory region is reserved and committed in a single VirtualAlloc() call. 2793// This makes Windows large page support more or less like Solaris ISM, in 2794// that the entire heap must be committed upfront. This probably will change 2795// in the future, if so the code below needs to be revisited. 2796 2797#ifndef MEM_LARGE_PAGES 2798 #define MEM_LARGE_PAGES 0x20000000 2799#endif 2800 2801static HANDLE _hProcess; 2802static HANDLE _hToken; 2803 2804// Container for NUMA node list info 2805class NUMANodeListHolder { 2806 private: 2807 int *_numa_used_node_list; // allocated below 2808 int _numa_used_node_count; 2809 2810 void free_node_list() { 2811 if (_numa_used_node_list != NULL) { 2812 FREE_C_HEAP_ARRAY(int, _numa_used_node_list); 2813 } 2814 } 2815 2816 public: 2817 NUMANodeListHolder() { 2818 _numa_used_node_count = 0; 2819 _numa_used_node_list = NULL; 2820 // do rest of initialization in build routine (after function pointers are set up) 2821 } 2822 2823 ~NUMANodeListHolder() { 2824 free_node_list(); 2825 } 2826 2827 bool build() { 2828 DWORD_PTR proc_aff_mask; 2829 DWORD_PTR sys_aff_mask; 2830 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false; 2831 ULONG highest_node_number; 2832 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false; 2833 free_node_list(); 2834 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal); 2835 for (unsigned int i = 0; i <= highest_node_number; i++) { 2836 ULONGLONG proc_mask_numa_node; 2837 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false; 2838 if ((proc_aff_mask & proc_mask_numa_node)!=0) { 2839 _numa_used_node_list[_numa_used_node_count++] = i; 2840 } 2841 } 2842 return (_numa_used_node_count > 1); 2843 } 2844 2845 int get_count() { return _numa_used_node_count; } 2846 int get_node_list_entry(int n) { 2847 // for indexes out of range, returns -1 2848 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1); 2849 } 2850 2851} numa_node_list_holder; 2852 2853 2854 2855static size_t _large_page_size = 0; 2856 2857static bool resolve_functions_for_large_page_init() { 2858 return os::Kernel32Dll::GetLargePageMinimumAvailable() && 2859 os::Advapi32Dll::AdvapiAvailable(); 2860} 2861 2862static bool request_lock_memory_privilege() { 2863 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2864 os::current_process_id()); 2865 2866 LUID luid; 2867 if (_hProcess != NULL && 2868 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2869 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2870 2871 TOKEN_PRIVILEGES tp; 2872 tp.PrivilegeCount = 1; 2873 tp.Privileges[0].Luid = luid; 2874 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2875 2876 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2877 // privilege. Check GetLastError() too. See MSDN document. 2878 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2879 (GetLastError() == ERROR_SUCCESS)) { 2880 return true; 2881 } 2882 } 2883 2884 return false; 2885} 2886 2887static void cleanup_after_large_page_init() { 2888 if (_hProcess) CloseHandle(_hProcess); 2889 _hProcess = NULL; 2890 if (_hToken) CloseHandle(_hToken); 2891 _hToken = NULL; 2892} 2893 2894static bool numa_interleaving_init() { 2895 bool success = false; 2896 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving); 2897 2898 // print a warning if UseNUMAInterleaving flag is specified on command line 2899 bool warn_on_failure = use_numa_interleaving_specified; 2900#define WARN(msg) if (warn_on_failure) { warning(msg); } 2901 2902 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages) 2903 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2904 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity); 2905 2906 if (os::Kernel32Dll::NumaCallsAvailable()) { 2907 if (numa_node_list_holder.build()) { 2908 if (PrintMiscellaneous && Verbose) { 2909 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count()); 2910 for (int i = 0; i < numa_node_list_holder.get_count(); i++) { 2911 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i)); 2912 } 2913 tty->print("\n"); 2914 } 2915 success = true; 2916 } else { 2917 WARN("Process does not cover multiple NUMA nodes."); 2918 } 2919 } else { 2920 WARN("NUMA Interleaving is not supported by the operating system."); 2921 } 2922 if (!success) { 2923 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag."); 2924 } 2925 return success; 2926#undef WARN 2927} 2928 2929// this routine is used whenever we need to reserve a contiguous VA range 2930// but we need to make separate VirtualAlloc calls for each piece of the range 2931// Reasons for doing this: 2932// * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise) 2933// * UseNUMAInterleaving requires a separate node for each piece 2934static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, 2935 DWORD prot, 2936 bool should_inject_error = false) { 2937 char * p_buf; 2938 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size 2939 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2940 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size; 2941 2942 // first reserve enough address space in advance since we want to be 2943 // able to break a single contiguous virtual address range into multiple 2944 // large page commits but WS2003 does not allow reserving large page space 2945 // so we just use 4K pages for reserve, this gives us a legal contiguous 2946 // address space. then we will deallocate that reservation, and re alloc 2947 // using large pages 2948 const size_t size_of_reserve = bytes + chunk_size; 2949 if (bytes > size_of_reserve) { 2950 // Overflowed. 2951 return NULL; 2952 } 2953 p_buf = (char *) VirtualAlloc(addr, 2954 size_of_reserve, // size of Reserve 2955 MEM_RESERVE, 2956 PAGE_READWRITE); 2957 // If reservation failed, return NULL 2958 if (p_buf == NULL) return NULL; 2959 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC); 2960 os::release_memory(p_buf, bytes + chunk_size); 2961 2962 // we still need to round up to a page boundary (in case we are using large pages) 2963 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size) 2964 // instead we handle this in the bytes_to_rq computation below 2965 p_buf = (char *) align_size_up((size_t)p_buf, page_size); 2966 2967 // now go through and allocate one chunk at a time until all bytes are 2968 // allocated 2969 size_t bytes_remaining = bytes; 2970 // An overflow of align_size_up() would have been caught above 2971 // in the calculation of size_of_reserve. 2972 char * next_alloc_addr = p_buf; 2973 HANDLE hProc = GetCurrentProcess(); 2974 2975#ifdef ASSERT 2976 // Variable for the failure injection 2977 long ran_num = os::random(); 2978 size_t fail_after = ran_num % bytes; 2979#endif 2980 2981 int count=0; 2982 while (bytes_remaining) { 2983 // select bytes_to_rq to get to the next chunk_size boundary 2984 2985 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size)); 2986 // Note allocate and commit 2987 char * p_new; 2988 2989#ifdef ASSERT 2990 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after); 2991#else 2992 const bool inject_error_now = false; 2993#endif 2994 2995 if (inject_error_now) { 2996 p_new = NULL; 2997 } else { 2998 if (!UseNUMAInterleaving) { 2999 p_new = (char *) VirtualAlloc(next_alloc_addr, 3000 bytes_to_rq, 3001 flags, 3002 prot); 3003 } else { 3004 // get the next node to use from the used_node_list 3005 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected"); 3006 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count()); 3007 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc, 3008 next_alloc_addr, 3009 bytes_to_rq, 3010 flags, 3011 prot, 3012 node); 3013 } 3014 } 3015 3016 if (p_new == NULL) { 3017 // Free any allocated pages 3018 if (next_alloc_addr > p_buf) { 3019 // Some memory was committed so release it. 3020 size_t bytes_to_release = bytes - bytes_remaining; 3021 // NMT has yet to record any individual blocks, so it 3022 // need to create a dummy 'reserve' record to match 3023 // the release. 3024 MemTracker::record_virtual_memory_reserve((address)p_buf, 3025 bytes_to_release, CALLER_PC); 3026 os::release_memory(p_buf, bytes_to_release); 3027 } 3028#ifdef ASSERT 3029 if (should_inject_error) { 3030 if (TracePageSizes && Verbose) { 3031 tty->print_cr("Reserving pages individually failed."); 3032 } 3033 } 3034#endif 3035 return NULL; 3036 } 3037 3038 bytes_remaining -= bytes_to_rq; 3039 next_alloc_addr += bytes_to_rq; 3040 count++; 3041 } 3042 // Although the memory is allocated individually, it is returned as one. 3043 // NMT records it as one block. 3044 if ((flags & MEM_COMMIT) != 0) { 3045 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC); 3046 } else { 3047 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC); 3048 } 3049 3050 // made it this far, success 3051 return p_buf; 3052} 3053 3054 3055 3056void os::large_page_init() { 3057 if (!UseLargePages) return; 3058 3059 // print a warning if any large page related flag is specified on command line 3060 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 3061 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 3062 bool success = false; 3063 3064#define WARN(msg) if (warn_on_failure) { warning(msg); } 3065 if (resolve_functions_for_large_page_init()) { 3066 if (request_lock_memory_privilege()) { 3067 size_t s = os::Kernel32Dll::GetLargePageMinimum(); 3068 if (s) { 3069#if defined(IA32) || defined(AMD64) 3070 if (s > 4*M || LargePageSizeInBytes > 4*M) { 3071 WARN("JVM cannot use large pages bigger than 4mb."); 3072 } else { 3073#endif 3074 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 3075 _large_page_size = LargePageSizeInBytes; 3076 } else { 3077 _large_page_size = s; 3078 } 3079 success = true; 3080#if defined(IA32) || defined(AMD64) 3081 } 3082#endif 3083 } else { 3084 WARN("Large page is not supported by the processor."); 3085 } 3086 } else { 3087 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 3088 } 3089 } else { 3090 WARN("Large page is not supported by the operating system."); 3091 } 3092#undef WARN 3093 3094 const size_t default_page_size = (size_t) vm_page_size(); 3095 if (success && _large_page_size > default_page_size) { 3096 _page_sizes[0] = _large_page_size; 3097 _page_sizes[1] = default_page_size; 3098 _page_sizes[2] = 0; 3099 } 3100 3101 cleanup_after_large_page_init(); 3102 UseLargePages = success; 3103} 3104 3105// On win32, one cannot release just a part of reserved memory, it's an 3106// all or nothing deal. When we split a reservation, we must break the 3107// reservation into two reservations. 3108void os::pd_split_reserved_memory(char *base, size_t size, size_t split, 3109 bool realloc) { 3110 if (size > 0) { 3111 release_memory(base, size); 3112 if (realloc) { 3113 reserve_memory(split, base); 3114 } 3115 if (size != split) { 3116 reserve_memory(size - split, base + split); 3117 } 3118 } 3119} 3120 3121// Multiple threads can race in this code but it's not possible to unmap small sections of 3122// virtual space to get requested alignment, like posix-like os's. 3123// Windows prevents multiple thread from remapping over each other so this loop is thread-safe. 3124char* os::reserve_memory_aligned(size_t size, size_t alignment) { 3125 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 3126 "Alignment must be a multiple of allocation granularity (page size)"); 3127 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 3128 3129 size_t extra_size = size + alignment; 3130 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 3131 3132 char* aligned_base = NULL; 3133 3134 do { 3135 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 3136 if (extra_base == NULL) { 3137 return NULL; 3138 } 3139 // Do manual alignment 3140 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 3141 3142 os::release_memory(extra_base, extra_size); 3143 3144 aligned_base = os::reserve_memory(size, aligned_base); 3145 3146 } while (aligned_base == NULL); 3147 3148 return aligned_base; 3149} 3150 3151char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 3152 assert((size_t)addr % os::vm_allocation_granularity() == 0, 3153 "reserve alignment"); 3154 assert(bytes % os::vm_page_size() == 0, "reserve page size"); 3155 char* res; 3156 // note that if UseLargePages is on, all the areas that require interleaving 3157 // will go thru reserve_memory_special rather than thru here. 3158 bool use_individual = (UseNUMAInterleaving && !UseLargePages); 3159 if (!use_individual) { 3160 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 3161 } else { 3162 elapsedTimer reserveTimer; 3163 if (Verbose && PrintMiscellaneous) reserveTimer.start(); 3164 // in numa interleaving, we have to allocate pages individually 3165 // (well really chunks of NUMAInterleaveGranularity size) 3166 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE); 3167 if (res == NULL) { 3168 warning("NUMA page allocation failed"); 3169 } 3170 if (Verbose && PrintMiscellaneous) { 3171 reserveTimer.stop(); 3172 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes, 3173 reserveTimer.milliseconds(), reserveTimer.ticks()); 3174 } 3175 } 3176 assert(res == NULL || addr == NULL || addr == res, 3177 "Unexpected address from reserve."); 3178 3179 return res; 3180} 3181 3182// Reserve memory at an arbitrary address, only if that area is 3183// available (and not reserved for something else). 3184char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3185 // Windows os::reserve_memory() fails of the requested address range is 3186 // not avilable. 3187 return reserve_memory(bytes, requested_addr); 3188} 3189 3190size_t os::large_page_size() { 3191 return _large_page_size; 3192} 3193 3194bool os::can_commit_large_page_memory() { 3195 // Windows only uses large page memory when the entire region is reserved 3196 // and committed in a single VirtualAlloc() call. This may change in the 3197 // future, but with Windows 2003 it's not possible to commit on demand. 3198 return false; 3199} 3200 3201bool os::can_execute_large_page_memory() { 3202 return true; 3203} 3204 3205char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, 3206 bool exec) { 3207 assert(UseLargePages, "only for large pages"); 3208 3209 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { 3210 return NULL; // Fallback to small pages. 3211 } 3212 3213 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 3214 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3215 3216 // with large pages, there are two cases where we need to use Individual Allocation 3217 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003) 3218 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page 3219 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) { 3220 if (TracePageSizes && Verbose) { 3221 tty->print_cr("Reserving large pages individually."); 3222 } 3223 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError); 3224 if (p_buf == NULL) { 3225 // give an appropriate warning message 3226 if (UseNUMAInterleaving) { 3227 warning("NUMA large page allocation failed, UseLargePages flag ignored"); 3228 } 3229 if (UseLargePagesIndividualAllocation) { 3230 warning("Individually allocated large pages failed, " 3231 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 3232 } 3233 return NULL; 3234 } 3235 3236 return p_buf; 3237 3238 } else { 3239 if (TracePageSizes && Verbose) { 3240 tty->print_cr("Reserving large pages in a single large chunk."); 3241 } 3242 // normal policy just allocate it all at once 3243 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3244 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); 3245 if (res != NULL) { 3246 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC); 3247 } 3248 3249 return res; 3250 } 3251} 3252 3253bool os::release_memory_special(char* base, size_t bytes) { 3254 assert(base != NULL, "Sanity check"); 3255 return release_memory(base, bytes); 3256} 3257 3258void os::print_statistics() { 3259} 3260 3261static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) { 3262 int err = os::get_last_error(); 3263 char buf[256]; 3264 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3265 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 3266 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3267 exec, buf_len != 0 ? buf : "<no_error_string>", err); 3268} 3269 3270bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 3271 if (bytes == 0) { 3272 // Don't bother the OS with noops. 3273 return true; 3274 } 3275 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 3276 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 3277 // Don't attempt to print anything if the OS call fails. We're 3278 // probably low on resources, so the print itself may cause crashes. 3279 3280 // unless we have NUMAInterleaving enabled, the range of a commit 3281 // is always within a reserve covered by a single VirtualAlloc 3282 // in that case we can just do a single commit for the requested size 3283 if (!UseNUMAInterleaving) { 3284 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) { 3285 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3286 return false; 3287 } 3288 if (exec) { 3289 DWORD oldprot; 3290 // Windows doc says to use VirtualProtect to get execute permissions 3291 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) { 3292 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3293 return false; 3294 } 3295 } 3296 return true; 3297 } else { 3298 3299 // when NUMAInterleaving is enabled, the commit might cover a range that 3300 // came from multiple VirtualAlloc reserves (using allocate_pages_individually). 3301 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery 3302 // returns represents the number of bytes that can be committed in one step. 3303 size_t bytes_remaining = bytes; 3304 char * next_alloc_addr = addr; 3305 while (bytes_remaining > 0) { 3306 MEMORY_BASIC_INFORMATION alloc_info; 3307 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info)); 3308 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3309 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, 3310 PAGE_READWRITE) == NULL) { 3311 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3312 exec);) 3313 return false; 3314 } 3315 if (exec) { 3316 DWORD oldprot; 3317 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, 3318 PAGE_EXECUTE_READWRITE, &oldprot)) { 3319 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3320 exec);) 3321 return false; 3322 } 3323 } 3324 bytes_remaining -= bytes_to_rq; 3325 next_alloc_addr += bytes_to_rq; 3326 } 3327 } 3328 // if we made it this far, return true 3329 return true; 3330} 3331 3332bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 3333 bool exec) { 3334 // alignment_hint is ignored on this OS 3335 return pd_commit_memory(addr, size, exec); 3336} 3337 3338void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 3339 const char* mesg) { 3340 assert(mesg != NULL, "mesg must be specified"); 3341 if (!pd_commit_memory(addr, size, exec)) { 3342 warn_fail_commit_memory(addr, size, exec); 3343 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 3344 } 3345} 3346 3347void os::pd_commit_memory_or_exit(char* addr, size_t size, 3348 size_t alignment_hint, bool exec, 3349 const char* mesg) { 3350 // alignment_hint is ignored on this OS 3351 pd_commit_memory_or_exit(addr, size, exec, mesg); 3352} 3353 3354bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3355 if (bytes == 0) { 3356 // Don't bother the OS with noops. 3357 return true; 3358 } 3359 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 3360 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 3361 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0); 3362} 3363 3364bool os::pd_release_memory(char* addr, size_t bytes) { 3365 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 3366} 3367 3368bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 3369 return os::commit_memory(addr, size, !ExecMem); 3370} 3371 3372bool os::remove_stack_guard_pages(char* addr, size_t size) { 3373 return os::uncommit_memory(addr, size); 3374} 3375 3376// Set protections specified 3377bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3378 bool is_committed) { 3379 unsigned int p = 0; 3380 switch (prot) { 3381 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 3382 case MEM_PROT_READ: p = PAGE_READONLY; break; 3383 case MEM_PROT_RW: p = PAGE_READWRITE; break; 3384 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 3385 default: 3386 ShouldNotReachHere(); 3387 } 3388 3389 DWORD old_status; 3390 3391 // Strange enough, but on Win32 one can change protection only for committed 3392 // memory, not a big deal anyway, as bytes less or equal than 64K 3393 if (!is_committed) { 3394 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX, 3395 "cannot commit protection page"); 3396 } 3397 // One cannot use os::guard_memory() here, as on Win32 guard page 3398 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 3399 // 3400 // Pages in the region become guard pages. Any attempt to access a guard page 3401 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 3402 // the guard page status. Guard pages thus act as a one-time access alarm. 3403 return VirtualProtect(addr, bytes, p, &old_status) != 0; 3404} 3405 3406bool os::guard_memory(char* addr, size_t bytes) { 3407 DWORD old_status; 3408 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 3409} 3410 3411bool os::unguard_memory(char* addr, size_t bytes) { 3412 DWORD old_status; 3413 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 3414} 3415 3416void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3417void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3418void os::numa_make_global(char *addr, size_t bytes) { } 3419void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 3420bool os::numa_topology_changed() { return false; } 3421size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); } 3422int os::numa_get_group_id() { return 0; } 3423size_t os::numa_get_leaf_groups(int *ids, size_t size) { 3424 if (numa_node_list_holder.get_count() == 0 && size > 0) { 3425 // Provide an answer for UMA systems 3426 ids[0] = 0; 3427 return 1; 3428 } else { 3429 // check for size bigger than actual groups_num 3430 size = MIN2(size, numa_get_groups_num()); 3431 for (int i = 0; i < (int)size; i++) { 3432 ids[i] = numa_node_list_holder.get_node_list_entry(i); 3433 } 3434 return size; 3435 } 3436} 3437 3438bool os::get_page_info(char *start, page_info* info) { 3439 return false; 3440} 3441 3442char *os::scan_pages(char *start, char* end, page_info* page_expected, 3443 page_info* page_found) { 3444 return end; 3445} 3446 3447char* os::non_memory_address_word() { 3448 // Must never look like an address returned by reserve_memory, 3449 // even in its subfields (as defined by the CPU immediate fields, 3450 // if the CPU splits constants across multiple instructions). 3451 return (char*)-1; 3452} 3453 3454#define MAX_ERROR_COUNT 100 3455#define SYS_THREAD_ERROR 0xffffffffUL 3456 3457void os::pd_start_thread(Thread* thread) { 3458 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 3459 // Returns previous suspend state: 3460 // 0: Thread was not suspended 3461 // 1: Thread is running now 3462 // >1: Thread is still suspended. 3463 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3464} 3465 3466class HighResolutionInterval : public CHeapObj<mtThread> { 3467 // The default timer resolution seems to be 10 milliseconds. 3468 // (Where is this written down?) 3469 // If someone wants to sleep for only a fraction of the default, 3470 // then we set the timer resolution down to 1 millisecond for 3471 // the duration of their interval. 3472 // We carefully set the resolution back, since otherwise we 3473 // seem to incur an overhead (3%?) that we don't need. 3474 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 3475 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 3476 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 3477 // timeBeginPeriod() if the relative error exceeded some threshold. 3478 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 3479 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 3480 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 3481 // resolution timers running. 3482 private: 3483 jlong resolution; 3484 public: 3485 HighResolutionInterval(jlong ms) { 3486 resolution = ms % 10L; 3487 if (resolution != 0) { 3488 MMRESULT result = timeBeginPeriod(1L); 3489 } 3490 } 3491 ~HighResolutionInterval() { 3492 if (resolution != 0) { 3493 MMRESULT result = timeEndPeriod(1L); 3494 } 3495 resolution = 0L; 3496 } 3497}; 3498 3499int os::sleep(Thread* thread, jlong ms, bool interruptable) { 3500 jlong limit = (jlong) MAXDWORD; 3501 3502 while (ms > limit) { 3503 int res; 3504 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) { 3505 return res; 3506 } 3507 ms -= limit; 3508 } 3509 3510 assert(thread == Thread::current(), "thread consistency check"); 3511 OSThread* osthread = thread->osthread(); 3512 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 3513 int result; 3514 if (interruptable) { 3515 assert(thread->is_Java_thread(), "must be java thread"); 3516 JavaThread *jt = (JavaThread *) thread; 3517 ThreadBlockInVM tbivm(jt); 3518 3519 jt->set_suspend_equivalent(); 3520 // cleared by handle_special_suspend_equivalent_condition() or 3521 // java_suspend_self() via check_and_wait_while_suspended() 3522 3523 HANDLE events[1]; 3524 events[0] = osthread->interrupt_event(); 3525 HighResolutionInterval *phri=NULL; 3526 if (!ForceTimeHighResolution) { 3527 phri = new HighResolutionInterval(ms); 3528 } 3529 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 3530 result = OS_TIMEOUT; 3531 } else { 3532 ResetEvent(osthread->interrupt_event()); 3533 osthread->set_interrupted(false); 3534 result = OS_INTRPT; 3535 } 3536 delete phri; //if it is NULL, harmless 3537 3538 // were we externally suspended while we were waiting? 3539 jt->check_and_wait_while_suspended(); 3540 } else { 3541 assert(!thread->is_Java_thread(), "must not be java thread"); 3542 Sleep((long) ms); 3543 result = OS_TIMEOUT; 3544 } 3545 return result; 3546} 3547 3548// Short sleep, direct OS call. 3549// 3550// ms = 0, means allow others (if any) to run. 3551// 3552void os::naked_short_sleep(jlong ms) { 3553 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3554 Sleep(ms); 3555} 3556 3557// Sleep forever; naked call to OS-specific sleep; use with CAUTION 3558void os::infinite_sleep() { 3559 while (true) { // sleep forever ... 3560 Sleep(100000); // ... 100 seconds at a time 3561 } 3562} 3563 3564typedef BOOL (WINAPI * STTSignature)(void); 3565 3566void os::naked_yield() { 3567 // Use either SwitchToThread() or Sleep(0) 3568 // Consider passing back the return value from SwitchToThread(). 3569 if (os::Kernel32Dll::SwitchToThreadAvailable()) { 3570 SwitchToThread(); 3571 } else { 3572 Sleep(0); 3573 } 3574} 3575 3576// Win32 only gives you access to seven real priorities at a time, 3577// so we compress Java's ten down to seven. It would be better 3578// if we dynamically adjusted relative priorities. 3579 3580int os::java_to_os_priority[CriticalPriority + 1] = { 3581 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3582 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3583 THREAD_PRIORITY_LOWEST, // 2 3584 THREAD_PRIORITY_BELOW_NORMAL, // 3 3585 THREAD_PRIORITY_BELOW_NORMAL, // 4 3586 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3587 THREAD_PRIORITY_NORMAL, // 6 3588 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3589 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3590 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3591 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority 3592 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority 3593}; 3594 3595int prio_policy1[CriticalPriority + 1] = { 3596 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3597 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3598 THREAD_PRIORITY_LOWEST, // 2 3599 THREAD_PRIORITY_BELOW_NORMAL, // 3 3600 THREAD_PRIORITY_BELOW_NORMAL, // 4 3601 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3602 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3603 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3604 THREAD_PRIORITY_HIGHEST, // 8 3605 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3606 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority 3607 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority 3608}; 3609 3610static int prio_init() { 3611 // If ThreadPriorityPolicy is 1, switch tables 3612 if (ThreadPriorityPolicy == 1) { 3613 int i; 3614 for (i = 0; i < CriticalPriority + 1; i++) { 3615 os::java_to_os_priority[i] = prio_policy1[i]; 3616 } 3617 } 3618 if (UseCriticalJavaThreadPriority) { 3619 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 3620 } 3621 return 0; 3622} 3623 3624OSReturn os::set_native_priority(Thread* thread, int priority) { 3625 if (!UseThreadPriorities) return OS_OK; 3626 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3627 return ret ? OS_OK : OS_ERR; 3628} 3629 3630OSReturn os::get_native_priority(const Thread* const thread, 3631 int* priority_ptr) { 3632 if (!UseThreadPriorities) { 3633 *priority_ptr = java_to_os_priority[NormPriority]; 3634 return OS_OK; 3635 } 3636 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3637 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3638 assert(false, "GetThreadPriority failed"); 3639 return OS_ERR; 3640 } 3641 *priority_ptr = os_prio; 3642 return OS_OK; 3643} 3644 3645 3646// Hint to the underlying OS that a task switch would not be good. 3647// Void return because it's a hint and can fail. 3648void os::hint_no_preempt() {} 3649 3650void os::interrupt(Thread* thread) { 3651 assert(!thread->is_Java_thread() || Thread::current() == thread || 3652 Threads_lock->owned_by_self(), 3653 "possibility of dangling Thread pointer"); 3654 3655 OSThread* osthread = thread->osthread(); 3656 osthread->set_interrupted(true); 3657 // More than one thread can get here with the same value of osthread, 3658 // resulting in multiple notifications. We do, however, want the store 3659 // to interrupted() to be visible to other threads before we post 3660 // the interrupt event. 3661 OrderAccess::release(); 3662 SetEvent(osthread->interrupt_event()); 3663 // For JSR166: unpark after setting status 3664 if (thread->is_Java_thread()) { 3665 ((JavaThread*)thread)->parker()->unpark(); 3666 } 3667 3668 ParkEvent * ev = thread->_ParkEvent; 3669 if (ev != NULL) ev->unpark(); 3670} 3671 3672 3673bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3674 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3675 "possibility of dangling Thread pointer"); 3676 3677 OSThread* osthread = thread->osthread(); 3678 // There is no synchronization between the setting of the interrupt 3679 // and it being cleared here. It is critical - see 6535709 - that 3680 // we only clear the interrupt state, and reset the interrupt event, 3681 // if we are going to report that we were indeed interrupted - else 3682 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups 3683 // depending on the timing. By checking thread interrupt event to see 3684 // if the thread gets real interrupt thus prevent spurious wakeup. 3685 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0); 3686 if (interrupted && clear_interrupted) { 3687 osthread->set_interrupted(false); 3688 ResetEvent(osthread->interrupt_event()); 3689 } // Otherwise leave the interrupted state alone 3690 3691 return interrupted; 3692} 3693 3694// Get's a pc (hint) for a running thread. Currently used only for profiling. 3695ExtendedPC os::get_thread_pc(Thread* thread) { 3696 CONTEXT context; 3697 context.ContextFlags = CONTEXT_CONTROL; 3698 HANDLE handle = thread->osthread()->thread_handle(); 3699#ifdef _M_IA64 3700 assert(0, "Fix get_thread_pc"); 3701 return ExtendedPC(NULL); 3702#else 3703 if (GetThreadContext(handle, &context)) { 3704#ifdef _M_AMD64 3705 return ExtendedPC((address) context.Rip); 3706#else 3707 return ExtendedPC((address) context.Eip); 3708#endif 3709 } else { 3710 return ExtendedPC(NULL); 3711 } 3712#endif 3713} 3714 3715// GetCurrentThreadId() returns DWORD 3716intx os::current_thread_id() { return GetCurrentThreadId(); } 3717 3718static int _initial_pid = 0; 3719 3720int os::current_process_id() { 3721 return (_initial_pid ? _initial_pid : _getpid()); 3722} 3723 3724int os::win32::_vm_page_size = 0; 3725int os::win32::_vm_allocation_granularity = 0; 3726int os::win32::_processor_type = 0; 3727// Processor level is not available on non-NT systems, use vm_version instead 3728int os::win32::_processor_level = 0; 3729julong os::win32::_physical_memory = 0; 3730size_t os::win32::_default_stack_size = 0; 3731 3732intx os::win32::_os_thread_limit = 0; 3733volatile intx os::win32::_os_thread_count = 0; 3734 3735bool os::win32::_is_nt = false; 3736bool os::win32::_is_windows_2003 = false; 3737bool os::win32::_is_windows_server = false; 3738 3739// 6573254 3740// Currently, the bug is observed across all the supported Windows releases, 3741// including the latest one (as of this writing - Windows Server 2012 R2) 3742bool os::win32::_has_exit_bug = true; 3743bool os::win32::_has_performance_count = 0; 3744 3745void os::win32::initialize_system_info() { 3746 SYSTEM_INFO si; 3747 GetSystemInfo(&si); 3748 _vm_page_size = si.dwPageSize; 3749 _vm_allocation_granularity = si.dwAllocationGranularity; 3750 _processor_type = si.dwProcessorType; 3751 _processor_level = si.wProcessorLevel; 3752 set_processor_count(si.dwNumberOfProcessors); 3753 3754 MEMORYSTATUSEX ms; 3755 ms.dwLength = sizeof(ms); 3756 3757 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3758 // dwMemoryLoad (% of memory in use) 3759 GlobalMemoryStatusEx(&ms); 3760 _physical_memory = ms.ullTotalPhys; 3761 3762 OSVERSIONINFOEX oi; 3763 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 3764 GetVersionEx((OSVERSIONINFO*)&oi); 3765 switch (oi.dwPlatformId) { 3766 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 3767 case VER_PLATFORM_WIN32_NT: 3768 _is_nt = true; 3769 { 3770 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3771 if (os_vers == 5002) { 3772 _is_windows_2003 = true; 3773 } 3774 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER || 3775 oi.wProductType == VER_NT_SERVER) { 3776 _is_windows_server = true; 3777 } 3778 } 3779 break; 3780 default: fatal("Unknown platform"); 3781 } 3782 3783 _default_stack_size = os::current_stack_size(); 3784 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3785 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3786 "stack size not a multiple of page size"); 3787 3788 initialize_performance_counter(); 3789} 3790 3791 3792HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, 3793 int ebuflen) { 3794 char path[MAX_PATH]; 3795 DWORD size; 3796 DWORD pathLen = (DWORD)sizeof(path); 3797 HINSTANCE result = NULL; 3798 3799 // only allow library name without path component 3800 assert(strchr(name, '\\') == NULL, "path not allowed"); 3801 assert(strchr(name, ':') == NULL, "path not allowed"); 3802 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) { 3803 jio_snprintf(ebuf, ebuflen, 3804 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name); 3805 return NULL; 3806 } 3807 3808 // search system directory 3809 if ((size = GetSystemDirectory(path, pathLen)) > 0) { 3810 if (size >= pathLen) { 3811 return NULL; // truncated 3812 } 3813 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3814 return NULL; // truncated 3815 } 3816 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3817 return result; 3818 } 3819 } 3820 3821 // try Windows directory 3822 if ((size = GetWindowsDirectory(path, pathLen)) > 0) { 3823 if (size >= pathLen) { 3824 return NULL; // truncated 3825 } 3826 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3827 return NULL; // truncated 3828 } 3829 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3830 return result; 3831 } 3832 } 3833 3834 jio_snprintf(ebuf, ebuflen, 3835 "os::win32::load_windows_dll() cannot load %s from system directories.", name); 3836 return NULL; 3837} 3838 3839#define EXIT_TIMEOUT 300000 /* 5 minutes */ 3840 3841static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) { 3842 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect); 3843 return TRUE; 3844} 3845 3846int os::win32::exit_process_or_thread(Ept what, int exit_code) { 3847 // Basic approach: 3848 // - Each exiting thread registers its intent to exit and then does so. 3849 // - A thread trying to terminate the process must wait for all 3850 // threads currently exiting to complete their exit. 3851 3852 if (os::win32::has_exit_bug()) { 3853 // The array holds handles of the threads that have started exiting by calling 3854 // _endthreadex(). 3855 // Should be large enough to avoid blocking the exiting thread due to lack of 3856 // a free slot. 3857 static HANDLE handles[MAXIMUM_WAIT_OBJECTS]; 3858 static int handle_count = 0; 3859 3860 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT; 3861 static CRITICAL_SECTION crit_sect; 3862 static volatile jint process_exiting = 0; 3863 int i, j; 3864 DWORD res; 3865 HANDLE hproc, hthr; 3866 3867 // The first thread that reached this point, initializes the critical section. 3868 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) { 3869 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__); 3870 } else if (OrderAccess::load_acquire(&process_exiting) == 0) { 3871 EnterCriticalSection(&crit_sect); 3872 3873 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) { 3874 // Remove from the array those handles of the threads that have completed exiting. 3875 for (i = 0, j = 0; i < handle_count; ++i) { 3876 res = WaitForSingleObject(handles[i], 0 /* don't wait */); 3877 if (res == WAIT_TIMEOUT) { 3878 handles[j++] = handles[i]; 3879 } else { 3880 if (res == WAIT_FAILED) { 3881 warning("WaitForSingleObject failed (%u) in %s: %d\n", 3882 GetLastError(), __FILE__, __LINE__); 3883 } 3884 // Don't keep the handle, if we failed waiting for it. 3885 CloseHandle(handles[i]); 3886 } 3887 } 3888 3889 // If there's no free slot in the array of the kept handles, we'll have to 3890 // wait until at least one thread completes exiting. 3891 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) { 3892 // Raise the priority of the oldest exiting thread to increase its chances 3893 // to complete sooner. 3894 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL); 3895 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT); 3896 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) { 3897 i = (res - WAIT_OBJECT_0); 3898 handle_count = MAXIMUM_WAIT_OBJECTS - 1; 3899 for (; i < handle_count; ++i) { 3900 handles[i] = handles[i + 1]; 3901 } 3902 } else { 3903 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3904 (res == WAIT_FAILED ? "failed" : "timed out"), 3905 GetLastError(), __FILE__, __LINE__); 3906 // Don't keep handles, if we failed waiting for them. 3907 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) { 3908 CloseHandle(handles[i]); 3909 } 3910 handle_count = 0; 3911 } 3912 } 3913 3914 // Store a duplicate of the current thread handle in the array of handles. 3915 hproc = GetCurrentProcess(); 3916 hthr = GetCurrentThread(); 3917 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count], 3918 0, FALSE, DUPLICATE_SAME_ACCESS)) { 3919 warning("DuplicateHandle failed (%u) in %s: %d\n", 3920 GetLastError(), __FILE__, __LINE__); 3921 } else { 3922 ++handle_count; 3923 } 3924 3925 // The current exiting thread has stored its handle in the array, and now 3926 // should leave the critical section before calling _endthreadex(). 3927 3928 } else if (what != EPT_THREAD) { 3929 if (handle_count > 0) { 3930 // Before ending the process, make sure all the threads that had called 3931 // _endthreadex() completed. 3932 3933 // Set the priority level of the current thread to the same value as 3934 // the priority level of exiting threads. 3935 // This is to ensure it will be given a fair chance to execute if 3936 // the timeout expires. 3937 hthr = GetCurrentThread(); 3938 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL); 3939 for (i = 0; i < handle_count; ++i) { 3940 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL); 3941 } 3942 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT); 3943 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) { 3944 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3945 (res == WAIT_FAILED ? "failed" : "timed out"), 3946 GetLastError(), __FILE__, __LINE__); 3947 } 3948 for (i = 0; i < handle_count; ++i) { 3949 CloseHandle(handles[i]); 3950 } 3951 handle_count = 0; 3952 } 3953 3954 OrderAccess::release_store(&process_exiting, 1); 3955 } 3956 3957 LeaveCriticalSection(&crit_sect); 3958 } 3959 3960 if (what == EPT_THREAD) { 3961 while (OrderAccess::load_acquire(&process_exiting) != 0) { 3962 // Some other thread is about to call exit(), so we 3963 // don't let the current thread proceed to _endthreadex() 3964 SuspendThread(GetCurrentThread()); 3965 // Avoid busy-wait loop, if SuspendThread() failed. 3966 Sleep(EXIT_TIMEOUT); 3967 } 3968 } 3969 } 3970 3971 // We are here if either 3972 // - there's no 'race at exit' bug on this OS release; 3973 // - initialization of the critical section failed (unlikely); 3974 // - the current thread has stored its handle and left the critical section; 3975 // - the process-exiting thread has raised the flag and left the critical section. 3976 if (what == EPT_THREAD) { 3977 _endthreadex((unsigned)exit_code); 3978 } else if (what == EPT_PROCESS) { 3979 ::exit(exit_code); 3980 } else { 3981 _exit(exit_code); 3982 } 3983 3984 // Should not reach here 3985 return exit_code; 3986} 3987 3988#undef EXIT_TIMEOUT 3989 3990void os::win32::setmode_streams() { 3991 _setmode(_fileno(stdin), _O_BINARY); 3992 _setmode(_fileno(stdout), _O_BINARY); 3993 _setmode(_fileno(stderr), _O_BINARY); 3994} 3995 3996 3997bool os::is_debugger_attached() { 3998 return IsDebuggerPresent() ? true : false; 3999} 4000 4001 4002void os::wait_for_keypress_at_exit(void) { 4003 if (PauseAtExit) { 4004 fprintf(stderr, "Press any key to continue...\n"); 4005 fgetc(stdin); 4006 } 4007} 4008 4009 4010bool os::message_box(const char* title, const char* message) { 4011 int result = MessageBox(NULL, message, title, 4012 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 4013 return result == IDYES; 4014} 4015 4016#ifndef PRODUCT 4017#ifndef _WIN64 4018// Helpers to check whether NX protection is enabled 4019int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 4020 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 4021 pex->ExceptionRecord->NumberParameters > 0 && 4022 pex->ExceptionRecord->ExceptionInformation[0] == 4023 EXCEPTION_INFO_EXEC_VIOLATION) { 4024 return EXCEPTION_EXECUTE_HANDLER; 4025 } 4026 return EXCEPTION_CONTINUE_SEARCH; 4027} 4028 4029void nx_check_protection() { 4030 // If NX is enabled we'll get an exception calling into code on the stack 4031 char code[] = { (char)0xC3 }; // ret 4032 void *code_ptr = (void *)code; 4033 __try { 4034 __asm call code_ptr 4035 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 4036 tty->print_raw_cr("NX protection detected."); 4037 } 4038} 4039#endif // _WIN64 4040#endif // PRODUCT 4041 4042// this is called _before_ the global arguments have been parsed 4043void os::init(void) { 4044 _initial_pid = _getpid(); 4045 4046 init_random(1234567); 4047 4048 win32::initialize_system_info(); 4049 win32::setmode_streams(); 4050 init_page_sizes((size_t) win32::vm_page_size()); 4051 4052 // This may be overridden later when argument processing is done. 4053 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, 4054 os::win32::is_windows_2003()); 4055 4056 // Initialize main_process and main_thread 4057 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 4058 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 4059 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 4060 fatal("DuplicateHandle failed\n"); 4061 } 4062 main_thread_id = (int) GetCurrentThreadId(); 4063 4064 // initialize fast thread access - only used for 32-bit 4065 win32::initialize_thread_ptr_offset(); 4066} 4067 4068// To install functions for atexit processing 4069extern "C" { 4070 static void perfMemory_exit_helper() { 4071 perfMemory_exit(); 4072 } 4073} 4074 4075static jint initSock(); 4076 4077// this is called _after_ the global arguments have been parsed 4078jint os::init_2(void) { 4079 // Allocate a single page and mark it as readable for safepoint polling 4080 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 4081 guarantee(polling_page != NULL, "Reserve Failed for polling page"); 4082 4083 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 4084 guarantee(return_page != NULL, "Commit Failed for polling page"); 4085 4086 os::set_polling_page(polling_page); 4087 4088#ifndef PRODUCT 4089 if (Verbose && PrintMiscellaneous) { 4090 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", 4091 (intptr_t)polling_page); 4092 } 4093#endif 4094 4095 if (!UseMembar) { 4096 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE); 4097 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 4098 4099 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE); 4100 guarantee(return_page != NULL, "Commit Failed for memory serialize page"); 4101 4102 os::set_memory_serialize_page(mem_serialize_page); 4103 4104#ifndef PRODUCT 4105 if (Verbose && PrintMiscellaneous) { 4106 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", 4107 (intptr_t)mem_serialize_page); 4108 } 4109#endif 4110 } 4111 4112 // Setup Windows Exceptions 4113 4114 // for debugging float code generation bugs 4115 if (ForceFloatExceptions) { 4116#ifndef _WIN64 4117 static long fp_control_word = 0; 4118 __asm { fstcw fp_control_word } 4119 // see Intel PPro Manual, Vol. 2, p 7-16 4120 const long precision = 0x20; 4121 const long underflow = 0x10; 4122 const long overflow = 0x08; 4123 const long zero_div = 0x04; 4124 const long denorm = 0x02; 4125 const long invalid = 0x01; 4126 fp_control_word |= invalid; 4127 __asm { fldcw fp_control_word } 4128#endif 4129 } 4130 4131 // If stack_commit_size is 0, windows will reserve the default size, 4132 // but only commit a small portion of it. 4133 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 4134 size_t default_reserve_size = os::win32::default_stack_size(); 4135 size_t actual_reserve_size = stack_commit_size; 4136 if (stack_commit_size < default_reserve_size) { 4137 // If stack_commit_size == 0, we want this too 4138 actual_reserve_size = default_reserve_size; 4139 } 4140 4141 // Check minimum allowable stack size for thread creation and to initialize 4142 // the java system classes, including StackOverflowError - depends on page 4143 // size. Add a page for compiler2 recursion in main thread. 4144 // Add in 2*BytesPerWord times page size to account for VM stack during 4145 // class initialization depending on 32 or 64 bit VM. 4146 size_t min_stack_allowed = 4147 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 4148 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size(); 4149 if (actual_reserve_size < min_stack_allowed) { 4150 tty->print_cr("\nThe stack size specified is too small, " 4151 "Specify at least %dk", 4152 min_stack_allowed / K); 4153 return JNI_ERR; 4154 } 4155 4156 JavaThread::set_stack_size_at_create(stack_commit_size); 4157 4158 // Calculate theoretical max. size of Threads to guard gainst artifical 4159 // out-of-memory situations, where all available address-space has been 4160 // reserved by thread stacks. 4161 assert(actual_reserve_size != 0, "Must have a stack"); 4162 4163 // Calculate the thread limit when we should start doing Virtual Memory 4164 // banging. Currently when the threads will have used all but 200Mb of space. 4165 // 4166 // TODO: consider performing a similar calculation for commit size instead 4167 // as reserve size, since on a 64-bit platform we'll run into that more 4168 // often than running out of virtual memory space. We can use the 4169 // lower value of the two calculations as the os_thread_limit. 4170 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 4171 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 4172 4173 // at exit methods are called in the reverse order of their registration. 4174 // there is no limit to the number of functions registered. atexit does 4175 // not set errno. 4176 4177 if (PerfAllowAtExitRegistration) { 4178 // only register atexit functions if PerfAllowAtExitRegistration is set. 4179 // atexit functions can be delayed until process exit time, which 4180 // can be problematic for embedded VM situations. Embedded VMs should 4181 // call DestroyJavaVM() to assure that VM resources are released. 4182 4183 // note: perfMemory_exit_helper atexit function may be removed in 4184 // the future if the appropriate cleanup code can be added to the 4185 // VM_Exit VMOperation's doit method. 4186 if (atexit(perfMemory_exit_helper) != 0) { 4187 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 4188 } 4189 } 4190 4191#ifndef _WIN64 4192 // Print something if NX is enabled (win32 on AMD64) 4193 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 4194#endif 4195 4196 // initialize thread priority policy 4197 prio_init(); 4198 4199 if (UseNUMA && !ForceNUMA) { 4200 UseNUMA = false; // We don't fully support this yet 4201 } 4202 4203 if (UseNUMAInterleaving) { 4204 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag 4205 bool success = numa_interleaving_init(); 4206 if (!success) UseNUMAInterleaving = false; 4207 } 4208 4209 if (initSock() != JNI_OK) { 4210 return JNI_ERR; 4211 } 4212 4213 return JNI_OK; 4214} 4215 4216// Mark the polling page as unreadable 4217void os::make_polling_page_unreadable(void) { 4218 DWORD old_status; 4219 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4220 PAGE_NOACCESS, &old_status)) { 4221 fatal("Could not disable polling page"); 4222 } 4223} 4224 4225// Mark the polling page as readable 4226void os::make_polling_page_readable(void) { 4227 DWORD old_status; 4228 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4229 PAGE_READONLY, &old_status)) { 4230 fatal("Could not enable polling page"); 4231 } 4232} 4233 4234 4235int os::stat(const char *path, struct stat *sbuf) { 4236 char pathbuf[MAX_PATH]; 4237 if (strlen(path) > MAX_PATH - 1) { 4238 errno = ENAMETOOLONG; 4239 return -1; 4240 } 4241 os::native_path(strcpy(pathbuf, path)); 4242 int ret = ::stat(pathbuf, sbuf); 4243 if (sbuf != NULL && UseUTCFileTimestamp) { 4244 // Fix for 6539723. st_mtime returned from stat() is dependent on 4245 // the system timezone and so can return different values for the 4246 // same file if/when daylight savings time changes. This adjustment 4247 // makes sure the same timestamp is returned regardless of the TZ. 4248 // 4249 // See: 4250 // http://msdn.microsoft.com/library/ 4251 // default.asp?url=/library/en-us/sysinfo/base/ 4252 // time_zone_information_str.asp 4253 // and 4254 // http://msdn.microsoft.com/library/default.asp?url= 4255 // /library/en-us/sysinfo/base/settimezoneinformation.asp 4256 // 4257 // NOTE: there is a insidious bug here: If the timezone is changed 4258 // after the call to stat() but before 'GetTimeZoneInformation()', then 4259 // the adjustment we do here will be wrong and we'll return the wrong 4260 // value (which will likely end up creating an invalid class data 4261 // archive). Absent a better API for this, or some time zone locking 4262 // mechanism, we'll have to live with this risk. 4263 TIME_ZONE_INFORMATION tz; 4264 DWORD tzid = GetTimeZoneInformation(&tz); 4265 int daylightBias = 4266 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 4267 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 4268 } 4269 return ret; 4270} 4271 4272 4273#define FT2INT64(ft) \ 4274 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 4275 4276 4277// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4278// are used by JVM M&M and JVMTI to get user+sys or user CPU time 4279// of a thread. 4280// 4281// current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4282// the fast estimate available on the platform. 4283 4284// current_thread_cpu_time() is not optimized for Windows yet 4285jlong os::current_thread_cpu_time() { 4286 // return user + sys since the cost is the same 4287 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 4288} 4289 4290jlong os::thread_cpu_time(Thread* thread) { 4291 // consistent with what current_thread_cpu_time() returns. 4292 return os::thread_cpu_time(thread, true /* user+sys */); 4293} 4294 4295jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4296 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4297} 4298 4299jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 4300 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 4301 // If this function changes, os::is_thread_cpu_time_supported() should too 4302 if (os::win32::is_nt()) { 4303 FILETIME CreationTime; 4304 FILETIME ExitTime; 4305 FILETIME KernelTime; 4306 FILETIME UserTime; 4307 4308 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime, 4309 &ExitTime, &KernelTime, &UserTime) == 0) { 4310 return -1; 4311 } else if (user_sys_cpu_time) { 4312 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 4313 } else { 4314 return FT2INT64(UserTime) * 100; 4315 } 4316 } else { 4317 return (jlong) timeGetTime() * 1000000; 4318 } 4319} 4320 4321void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4322 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4323 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4324 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4325 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4326} 4327 4328void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4329 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4330 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4331 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4332 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4333} 4334 4335bool os::is_thread_cpu_time_supported() { 4336 // see os::thread_cpu_time 4337 if (os::win32::is_nt()) { 4338 FILETIME CreationTime; 4339 FILETIME ExitTime; 4340 FILETIME KernelTime; 4341 FILETIME UserTime; 4342 4343 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime, 4344 &KernelTime, &UserTime) == 0) { 4345 return false; 4346 } else { 4347 return true; 4348 } 4349 } else { 4350 return false; 4351 } 4352} 4353 4354// Windows does't provide a loadavg primitive so this is stubbed out for now. 4355// It does have primitives (PDH API) to get CPU usage and run queue length. 4356// "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 4357// If we wanted to implement loadavg on Windows, we have a few options: 4358// 4359// a) Query CPU usage and run queue length and "fake" an answer by 4360// returning the CPU usage if it's under 100%, and the run queue 4361// length otherwise. It turns out that querying is pretty slow 4362// on Windows, on the order of 200 microseconds on a fast machine. 4363// Note that on the Windows the CPU usage value is the % usage 4364// since the last time the API was called (and the first call 4365// returns 100%), so we'd have to deal with that as well. 4366// 4367// b) Sample the "fake" answer using a sampling thread and store 4368// the answer in a global variable. The call to loadavg would 4369// just return the value of the global, avoiding the slow query. 4370// 4371// c) Sample a better answer using exponential decay to smooth the 4372// value. This is basically the algorithm used by UNIX kernels. 4373// 4374// Note that sampling thread starvation could affect both (b) and (c). 4375int os::loadavg(double loadavg[], int nelem) { 4376 return -1; 4377} 4378 4379 4380// DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 4381bool os::dont_yield() { 4382 return DontYieldALot; 4383} 4384 4385// This method is a slightly reworked copy of JDK's sysOpen 4386// from src/windows/hpi/src/sys_api_md.c 4387 4388int os::open(const char *path, int oflag, int mode) { 4389 char pathbuf[MAX_PATH]; 4390 4391 if (strlen(path) > MAX_PATH - 1) { 4392 errno = ENAMETOOLONG; 4393 return -1; 4394 } 4395 os::native_path(strcpy(pathbuf, path)); 4396 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 4397} 4398 4399FILE* os::open(int fd, const char* mode) { 4400 return ::_fdopen(fd, mode); 4401} 4402 4403// Is a (classpath) directory empty? 4404bool os::dir_is_empty(const char* path) { 4405 WIN32_FIND_DATA fd; 4406 HANDLE f = FindFirstFile(path, &fd); 4407 if (f == INVALID_HANDLE_VALUE) { 4408 return true; 4409 } 4410 FindClose(f); 4411 return false; 4412} 4413 4414// create binary file, rewriting existing file if required 4415int os::create_binary_file(const char* path, bool rewrite_existing) { 4416 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 4417 if (!rewrite_existing) { 4418 oflags |= _O_EXCL; 4419 } 4420 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 4421} 4422 4423// return current position of file pointer 4424jlong os::current_file_offset(int fd) { 4425 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 4426} 4427 4428// move file pointer to the specified offset 4429jlong os::seek_to_file_offset(int fd, jlong offset) { 4430 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 4431} 4432 4433 4434jlong os::lseek(int fd, jlong offset, int whence) { 4435 return (jlong) ::_lseeki64(fd, offset, whence); 4436} 4437 4438size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 4439 OVERLAPPED ov; 4440 DWORD nread; 4441 BOOL result; 4442 4443 ZeroMemory(&ov, sizeof(ov)); 4444 ov.Offset = (DWORD)offset; 4445 ov.OffsetHigh = (DWORD)(offset >> 32); 4446 4447 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4448 4449 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov); 4450 4451 return result ? nread : 0; 4452} 4453 4454 4455// This method is a slightly reworked copy of JDK's sysNativePath 4456// from src/windows/hpi/src/path_md.c 4457 4458// Convert a pathname to native format. On win32, this involves forcing all 4459// separators to be '\\' rather than '/' (both are legal inputs, but Win95 4460// sometimes rejects '/') and removing redundant separators. The input path is 4461// assumed to have been converted into the character encoding used by the local 4462// system. Because this might be a double-byte encoding, care is taken to 4463// treat double-byte lead characters correctly. 4464// 4465// This procedure modifies the given path in place, as the result is never 4466// longer than the original. There is no error return; this operation always 4467// succeeds. 4468char * os::native_path(char *path) { 4469 char *src = path, *dst = path, *end = path; 4470 char *colon = NULL; // If a drive specifier is found, this will 4471 // point to the colon following the drive letter 4472 4473 // Assumption: '/', '\\', ':', and drive letters are never lead bytes 4474 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\')) 4475 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte"); 4476 4477 // Check for leading separators 4478#define isfilesep(c) ((c) == '/' || (c) == '\\') 4479 while (isfilesep(*src)) { 4480 src++; 4481 } 4482 4483 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 4484 // Remove leading separators if followed by drive specifier. This 4485 // hack is necessary to support file URLs containing drive 4486 // specifiers (e.g., "file://c:/path"). As a side effect, 4487 // "/c:/path" can be used as an alternative to "c:/path". 4488 *dst++ = *src++; 4489 colon = dst; 4490 *dst++ = ':'; 4491 src++; 4492 } else { 4493 src = path; 4494 if (isfilesep(src[0]) && isfilesep(src[1])) { 4495 // UNC pathname: Retain first separator; leave src pointed at 4496 // second separator so that further separators will be collapsed 4497 // into the second separator. The result will be a pathname 4498 // beginning with "\\\\" followed (most likely) by a host name. 4499 src = dst = path + 1; 4500 path[0] = '\\'; // Force first separator to '\\' 4501 } 4502 } 4503 4504 end = dst; 4505 4506 // Remove redundant separators from remainder of path, forcing all 4507 // separators to be '\\' rather than '/'. Also, single byte space 4508 // characters are removed from the end of the path because those 4509 // are not legal ending characters on this operating system. 4510 // 4511 while (*src != '\0') { 4512 if (isfilesep(*src)) { 4513 *dst++ = '\\'; src++; 4514 while (isfilesep(*src)) src++; 4515 if (*src == '\0') { 4516 // Check for trailing separator 4517 end = dst; 4518 if (colon == dst - 2) break; // "z:\\" 4519 if (dst == path + 1) break; // "\\" 4520 if (dst == path + 2 && isfilesep(path[0])) { 4521 // "\\\\" is not collapsed to "\\" because "\\\\" marks the 4522 // beginning of a UNC pathname. Even though it is not, by 4523 // itself, a valid UNC pathname, we leave it as is in order 4524 // to be consistent with the path canonicalizer as well 4525 // as the win32 APIs, which treat this case as an invalid 4526 // UNC pathname rather than as an alias for the root 4527 // directory of the current drive. 4528 break; 4529 } 4530 end = --dst; // Path does not denote a root directory, so 4531 // remove trailing separator 4532 break; 4533 } 4534 end = dst; 4535 } else { 4536 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character 4537 *dst++ = *src++; 4538 if (*src) *dst++ = *src++; 4539 end = dst; 4540 } else { // Copy a single-byte character 4541 char c = *src++; 4542 *dst++ = c; 4543 // Space is not a legal ending character 4544 if (c != ' ') end = dst; 4545 } 4546 } 4547 } 4548 4549 *end = '\0'; 4550 4551 // For "z:", add "." to work around a bug in the C runtime library 4552 if (colon == dst - 1) { 4553 path[2] = '.'; 4554 path[3] = '\0'; 4555 } 4556 4557 return path; 4558} 4559 4560// This code is a copy of JDK's sysSetLength 4561// from src/windows/hpi/src/sys_api_md.c 4562 4563int os::ftruncate(int fd, jlong length) { 4564 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4565 long high = (long)(length >> 32); 4566 DWORD ret; 4567 4568 if (h == (HANDLE)(-1)) { 4569 return -1; 4570 } 4571 4572 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 4573 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 4574 return -1; 4575 } 4576 4577 if (::SetEndOfFile(h) == FALSE) { 4578 return -1; 4579 } 4580 4581 return 0; 4582} 4583 4584 4585// This code is a copy of JDK's sysSync 4586// from src/windows/hpi/src/sys_api_md.c 4587// except for the legacy workaround for a bug in Win 98 4588 4589int os::fsync(int fd) { 4590 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 4591 4592 if ((!::FlushFileBuffers(handle)) && 4593 (GetLastError() != ERROR_ACCESS_DENIED)) { 4594 // from winerror.h 4595 return -1; 4596 } 4597 return 0; 4598} 4599 4600static int nonSeekAvailable(int, long *); 4601static int stdinAvailable(int, long *); 4602 4603#define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR) 4604#define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO) 4605 4606// This code is a copy of JDK's sysAvailable 4607// from src/windows/hpi/src/sys_api_md.c 4608 4609int os::available(int fd, jlong *bytes) { 4610 jlong cur, end; 4611 struct _stati64 stbuf64; 4612 4613 if (::_fstati64(fd, &stbuf64) >= 0) { 4614 int mode = stbuf64.st_mode; 4615 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 4616 int ret; 4617 long lpbytes; 4618 if (fd == 0) { 4619 ret = stdinAvailable(fd, &lpbytes); 4620 } else { 4621 ret = nonSeekAvailable(fd, &lpbytes); 4622 } 4623 (*bytes) = (jlong)(lpbytes); 4624 return ret; 4625 } 4626 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 4627 return FALSE; 4628 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 4629 return FALSE; 4630 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 4631 return FALSE; 4632 } 4633 *bytes = end - cur; 4634 return TRUE; 4635 } else { 4636 return FALSE; 4637 } 4638} 4639 4640// This code is a copy of JDK's nonSeekAvailable 4641// from src/windows/hpi/src/sys_api_md.c 4642 4643static int nonSeekAvailable(int fd, long *pbytes) { 4644 // This is used for available on non-seekable devices 4645 // (like both named and anonymous pipes, such as pipes 4646 // connected to an exec'd process). 4647 // Standard Input is a special case. 4648 HANDLE han; 4649 4650 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 4651 return FALSE; 4652 } 4653 4654 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 4655 // PeekNamedPipe fails when at EOF. In that case we 4656 // simply make *pbytes = 0 which is consistent with the 4657 // behavior we get on Solaris when an fd is at EOF. 4658 // The only alternative is to raise an Exception, 4659 // which isn't really warranted. 4660 // 4661 if (::GetLastError() != ERROR_BROKEN_PIPE) { 4662 return FALSE; 4663 } 4664 *pbytes = 0; 4665 } 4666 return TRUE; 4667} 4668 4669#define MAX_INPUT_EVENTS 2000 4670 4671// This code is a copy of JDK's stdinAvailable 4672// from src/windows/hpi/src/sys_api_md.c 4673 4674static int stdinAvailable(int fd, long *pbytes) { 4675 HANDLE han; 4676 DWORD numEventsRead = 0; // Number of events read from buffer 4677 DWORD numEvents = 0; // Number of events in buffer 4678 DWORD i = 0; // Loop index 4679 DWORD curLength = 0; // Position marker 4680 DWORD actualLength = 0; // Number of bytes readable 4681 BOOL error = FALSE; // Error holder 4682 INPUT_RECORD *lpBuffer; // Pointer to records of input events 4683 4684 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4685 return FALSE; 4686 } 4687 4688 // Construct an array of input records in the console buffer 4689 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4690 if (error == 0) { 4691 return nonSeekAvailable(fd, pbytes); 4692 } 4693 4694 // lpBuffer must fit into 64K or else PeekConsoleInput fails 4695 if (numEvents > MAX_INPUT_EVENTS) { 4696 numEvents = MAX_INPUT_EVENTS; 4697 } 4698 4699 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal); 4700 if (lpBuffer == NULL) { 4701 return FALSE; 4702 } 4703 4704 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4705 if (error == 0) { 4706 os::free(lpBuffer); 4707 return FALSE; 4708 } 4709 4710 // Examine input records for the number of bytes available 4711 for (i=0; i<numEvents; i++) { 4712 if (lpBuffer[i].EventType == KEY_EVENT) { 4713 4714 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4715 &(lpBuffer[i].Event); 4716 if (keyRecord->bKeyDown == TRUE) { 4717 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4718 curLength++; 4719 if (*keyPressed == '\r') { 4720 actualLength = curLength; 4721 } 4722 } 4723 } 4724 } 4725 4726 if (lpBuffer != NULL) { 4727 os::free(lpBuffer); 4728 } 4729 4730 *pbytes = (long) actualLength; 4731 return TRUE; 4732} 4733 4734// Map a block of memory. 4735char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4736 char *addr, size_t bytes, bool read_only, 4737 bool allow_exec) { 4738 HANDLE hFile; 4739 char* base; 4740 4741 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4742 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4743 if (hFile == NULL) { 4744 if (PrintMiscellaneous && Verbose) { 4745 DWORD err = GetLastError(); 4746 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err); 4747 } 4748 return NULL; 4749 } 4750 4751 if (allow_exec) { 4752 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4753 // unless it comes from a PE image (which the shared archive is not.) 4754 // Even VirtualProtect refuses to give execute access to mapped memory 4755 // that was not previously executable. 4756 // 4757 // Instead, stick the executable region in anonymous memory. Yuck. 4758 // Penalty is that ~4 pages will not be shareable - in the future 4759 // we might consider DLLizing the shared archive with a proper PE 4760 // header so that mapping executable + sharing is possible. 4761 4762 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4763 PAGE_READWRITE); 4764 if (base == NULL) { 4765 if (PrintMiscellaneous && Verbose) { 4766 DWORD err = GetLastError(); 4767 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 4768 } 4769 CloseHandle(hFile); 4770 return NULL; 4771 } 4772 4773 DWORD bytes_read; 4774 OVERLAPPED overlapped; 4775 overlapped.Offset = (DWORD)file_offset; 4776 overlapped.OffsetHigh = 0; 4777 overlapped.hEvent = NULL; 4778 // ReadFile guarantees that if the return value is true, the requested 4779 // number of bytes were read before returning. 4780 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 4781 if (!res) { 4782 if (PrintMiscellaneous && Verbose) { 4783 DWORD err = GetLastError(); 4784 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 4785 } 4786 release_memory(base, bytes); 4787 CloseHandle(hFile); 4788 return NULL; 4789 } 4790 } else { 4791 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 4792 NULL /* file_name */); 4793 if (hMap == NULL) { 4794 if (PrintMiscellaneous && Verbose) { 4795 DWORD err = GetLastError(); 4796 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err); 4797 } 4798 CloseHandle(hFile); 4799 return NULL; 4800 } 4801 4802 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 4803 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 4804 (DWORD)bytes, addr); 4805 if (base == NULL) { 4806 if (PrintMiscellaneous && Verbose) { 4807 DWORD err = GetLastError(); 4808 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 4809 } 4810 CloseHandle(hMap); 4811 CloseHandle(hFile); 4812 return NULL; 4813 } 4814 4815 if (CloseHandle(hMap) == 0) { 4816 if (PrintMiscellaneous && Verbose) { 4817 DWORD err = GetLastError(); 4818 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 4819 } 4820 CloseHandle(hFile); 4821 return base; 4822 } 4823 } 4824 4825 if (allow_exec) { 4826 DWORD old_protect; 4827 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 4828 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 4829 4830 if (!res) { 4831 if (PrintMiscellaneous && Verbose) { 4832 DWORD err = GetLastError(); 4833 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 4834 } 4835 // Don't consider this a hard error, on IA32 even if the 4836 // VirtualProtect fails, we should still be able to execute 4837 CloseHandle(hFile); 4838 return base; 4839 } 4840 } 4841 4842 if (CloseHandle(hFile) == 0) { 4843 if (PrintMiscellaneous && Verbose) { 4844 DWORD err = GetLastError(); 4845 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 4846 } 4847 return base; 4848 } 4849 4850 return base; 4851} 4852 4853 4854// Remap a block of memory. 4855char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4856 char *addr, size_t bytes, bool read_only, 4857 bool allow_exec) { 4858 // This OS does not allow existing memory maps to be remapped so we 4859 // have to unmap the memory before we remap it. 4860 if (!os::unmap_memory(addr, bytes)) { 4861 return NULL; 4862 } 4863 4864 // There is a very small theoretical window between the unmap_memory() 4865 // call above and the map_memory() call below where a thread in native 4866 // code may be able to access an address that is no longer mapped. 4867 4868 return os::map_memory(fd, file_name, file_offset, addr, bytes, 4869 read_only, allow_exec); 4870} 4871 4872 4873// Unmap a block of memory. 4874// Returns true=success, otherwise false. 4875 4876bool os::pd_unmap_memory(char* addr, size_t bytes) { 4877 MEMORY_BASIC_INFORMATION mem_info; 4878 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) { 4879 if (PrintMiscellaneous && Verbose) { 4880 DWORD err = GetLastError(); 4881 tty->print_cr("VirtualQuery() failed: GetLastError->%ld.", err); 4882 } 4883 return false; 4884 } 4885 4886 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx. 4887 // Instead, executable region was allocated using VirtualAlloc(). See 4888 // pd_map_memory() above. 4889 // 4890 // The following flags should match the 'exec_access' flages used for 4891 // VirtualProtect() in pd_map_memory(). 4892 if (mem_info.Protect == PAGE_EXECUTE_READ || 4893 mem_info.Protect == PAGE_EXECUTE_READWRITE) { 4894 return pd_release_memory(addr, bytes); 4895 } 4896 4897 BOOL result = UnmapViewOfFile(addr); 4898 if (result == 0) { 4899 if (PrintMiscellaneous && Verbose) { 4900 DWORD err = GetLastError(); 4901 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 4902 } 4903 return false; 4904 } 4905 return true; 4906} 4907 4908void os::pause() { 4909 char filename[MAX_PATH]; 4910 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4911 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4912 } else { 4913 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4914 } 4915 4916 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4917 if (fd != -1) { 4918 struct stat buf; 4919 ::close(fd); 4920 while (::stat(filename, &buf) == 0) { 4921 Sleep(100); 4922 } 4923 } else { 4924 jio_fprintf(stderr, 4925 "Could not open pause file '%s', continuing immediately.\n", filename); 4926 } 4927} 4928 4929os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 4930 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 4931} 4932 4933// See the caveats for this class in os_windows.hpp 4934// Protects the callback call so that raised OS EXCEPTIONS causes a jump back 4935// into this method and returns false. If no OS EXCEPTION was raised, returns 4936// true. 4937// The callback is supposed to provide the method that should be protected. 4938// 4939bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 4940 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); 4941 assert(!WatcherThread::watcher_thread()->has_crash_protection(), 4942 "crash_protection already set?"); 4943 4944 bool success = true; 4945 __try { 4946 WatcherThread::watcher_thread()->set_crash_protection(this); 4947 cb.call(); 4948 } __except(EXCEPTION_EXECUTE_HANDLER) { 4949 // only for protection, nothing to do 4950 success = false; 4951 } 4952 WatcherThread::watcher_thread()->set_crash_protection(NULL); 4953 return success; 4954} 4955 4956// An Event wraps a win32 "CreateEvent" kernel handle. 4957// 4958// We have a number of choices regarding "CreateEvent" win32 handle leakage: 4959// 4960// 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 4961// field, and call CloseHandle() on the win32 event handle. Unpark() would 4962// need to be modified to tolerate finding a NULL (invalid) win32 event handle. 4963// In addition, an unpark() operation might fetch the handle field, but the 4964// event could recycle between the fetch and the SetEvent() operation. 4965// SetEvent() would either fail because the handle was invalid, or inadvertently work, 4966// as the win32 handle value had been recycled. In an ideal world calling SetEvent() 4967// on an stale but recycled handle would be harmless, but in practice this might 4968// confuse other non-Sun code, so it's not a viable approach. 4969// 4970// 2: Once a win32 event handle is associated with an Event, it remains associated 4971// with the Event. The event handle is never closed. This could be construed 4972// as handle leakage, but only up to the maximum # of threads that have been extant 4973// at any one time. This shouldn't be an issue, as windows platforms typically 4974// permit a process to have hundreds of thousands of open handles. 4975// 4976// 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 4977// and release unused handles. 4978// 4979// 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 4980// It's not clear, however, that we wouldn't be trading one type of leak for another. 4981// 4982// 5. Use an RCU-like mechanism (Read-Copy Update). 4983// Or perhaps something similar to Maged Michael's "Hazard pointers". 4984// 4985// We use (2). 4986// 4987// TODO-FIXME: 4988// 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 4989// 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 4990// to recover from (or at least detect) the dreaded Windows 841176 bug. 4991// 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 4992// into a single win32 CreateEvent() handle. 4993// 4994// Assumption: 4995// Only one parker can exist on an event, which is why we allocate 4996// them per-thread. Multiple unparkers can coexist. 4997// 4998// _Event transitions in park() 4999// -1 => -1 : illegal 5000// 1 => 0 : pass - return immediately 5001// 0 => -1 : block; then set _Event to 0 before returning 5002// 5003// _Event transitions in unpark() 5004// 0 => 1 : just return 5005// 1 => 1 : just return 5006// -1 => either 0 or 1; must signal target thread 5007// That is, we can safely transition _Event from -1 to either 5008// 0 or 1. 5009// 5010// _Event serves as a restricted-range semaphore. 5011// -1 : thread is blocked, i.e. there is a waiter 5012// 0 : neutral: thread is running or ready, 5013// could have been signaled after a wait started 5014// 1 : signaled - thread is running or ready 5015// 5016// Another possible encoding of _Event would be with 5017// explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5018// 5019 5020int os::PlatformEvent::park(jlong Millis) { 5021 // Transitions for _Event: 5022 // -1 => -1 : illegal 5023 // 1 => 0 : pass - return immediately 5024 // 0 => -1 : block; then set _Event to 0 before returning 5025 5026 guarantee(_ParkHandle != NULL , "Invariant"); 5027 guarantee(Millis > 0 , "Invariant"); 5028 5029 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 5030 // the initial park() operation. 5031 // Consider: use atomic decrement instead of CAS-loop 5032 5033 int v; 5034 for (;;) { 5035 v = _Event; 5036 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5037 } 5038 guarantee((v == 0) || (v == 1), "invariant"); 5039 if (v != 0) return OS_OK; 5040 5041 // Do this the hard way by blocking ... 5042 // TODO: consider a brief spin here, gated on the success of recent 5043 // spin attempts by this thread. 5044 // 5045 // We decompose long timeouts into series of shorter timed waits. 5046 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 5047 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 5048 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 5049 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 5050 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 5051 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 5052 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 5053 // for the already waited time. This policy does not admit any new outcomes. 5054 // In the future, however, we might want to track the accumulated wait time and 5055 // adjust Millis accordingly if we encounter a spurious wakeup. 5056 5057 const int MAXTIMEOUT = 0x10000000; 5058 DWORD rv = WAIT_TIMEOUT; 5059 while (_Event < 0 && Millis > 0) { 5060 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT) 5061 if (Millis > MAXTIMEOUT) { 5062 prd = MAXTIMEOUT; 5063 } 5064 rv = ::WaitForSingleObject(_ParkHandle, prd); 5065 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed"); 5066 if (rv == WAIT_TIMEOUT) { 5067 Millis -= prd; 5068 } 5069 } 5070 v = _Event; 5071 _Event = 0; 5072 // see comment at end of os::PlatformEvent::park() below: 5073 OrderAccess::fence(); 5074 // If we encounter a nearly simultanous timeout expiry and unpark() 5075 // we return OS_OK indicating we awoke via unpark(). 5076 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 5077 return (v >= 0) ? OS_OK : OS_TIMEOUT; 5078} 5079 5080void os::PlatformEvent::park() { 5081 // Transitions for _Event: 5082 // -1 => -1 : illegal 5083 // 1 => 0 : pass - return immediately 5084 // 0 => -1 : block; then set _Event to 0 before returning 5085 5086 guarantee(_ParkHandle != NULL, "Invariant"); 5087 // Invariant: Only the thread associated with the Event/PlatformEvent 5088 // may call park(). 5089 // Consider: use atomic decrement instead of CAS-loop 5090 int v; 5091 for (;;) { 5092 v = _Event; 5093 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5094 } 5095 guarantee((v == 0) || (v == 1), "invariant"); 5096 if (v != 0) return; 5097 5098 // Do this the hard way by blocking ... 5099 // TODO: consider a brief spin here, gated on the success of recent 5100 // spin attempts by this thread. 5101 while (_Event < 0) { 5102 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE); 5103 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed"); 5104 } 5105 5106 // Usually we'll find _Event == 0 at this point, but as 5107 // an optional optimization we clear it, just in case can 5108 // multiple unpark() operations drove _Event up to 1. 5109 _Event = 0; 5110 OrderAccess::fence(); 5111 guarantee(_Event >= 0, "invariant"); 5112} 5113 5114void os::PlatformEvent::unpark() { 5115 guarantee(_ParkHandle != NULL, "Invariant"); 5116 5117 // Transitions for _Event: 5118 // 0 => 1 : just return 5119 // 1 => 1 : just return 5120 // -1 => either 0 or 1; must signal target thread 5121 // That is, we can safely transition _Event from -1 to either 5122 // 0 or 1. 5123 // See also: "Semaphores in Plan 9" by Mullender & Cox 5124 // 5125 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5126 // that it will take two back-to-back park() calls for the owning 5127 // thread to block. This has the benefit of forcing a spurious return 5128 // from the first park() call after an unpark() call which will help 5129 // shake out uses of park() and unpark() without condition variables. 5130 5131 if (Atomic::xchg(1, &_Event) >= 0) return; 5132 5133 ::SetEvent(_ParkHandle); 5134} 5135 5136 5137// JSR166 5138// ------------------------------------------------------- 5139 5140// The Windows implementation of Park is very straightforward: Basic 5141// operations on Win32 Events turn out to have the right semantics to 5142// use them directly. We opportunistically resuse the event inherited 5143// from Monitor. 5144 5145void Parker::park(bool isAbsolute, jlong time) { 5146 guarantee(_ParkEvent != NULL, "invariant"); 5147 // First, demultiplex/decode time arguments 5148 if (time < 0) { // don't wait 5149 return; 5150 } else if (time == 0 && !isAbsolute) { 5151 time = INFINITE; 5152 } else if (isAbsolute) { 5153 time -= os::javaTimeMillis(); // convert to relative time 5154 if (time <= 0) { // already elapsed 5155 return; 5156 } 5157 } else { // relative 5158 time /= 1000000; // Must coarsen from nanos to millis 5159 if (time == 0) { // Wait for the minimal time unit if zero 5160 time = 1; 5161 } 5162 } 5163 5164 JavaThread* thread = JavaThread::current(); 5165 5166 // Don't wait if interrupted or already triggered 5167 if (Thread::is_interrupted(thread, false) || 5168 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 5169 ResetEvent(_ParkEvent); 5170 return; 5171 } else { 5172 ThreadBlockInVM tbivm(thread); 5173 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5174 thread->set_suspend_equivalent(); 5175 5176 WaitForSingleObject(_ParkEvent, time); 5177 ResetEvent(_ParkEvent); 5178 5179 // If externally suspended while waiting, re-suspend 5180 if (thread->handle_special_suspend_equivalent_condition()) { 5181 thread->java_suspend_self(); 5182 } 5183 } 5184} 5185 5186void Parker::unpark() { 5187 guarantee(_ParkEvent != NULL, "invariant"); 5188 SetEvent(_ParkEvent); 5189} 5190 5191// Run the specified command in a separate process. Return its exit value, 5192// or -1 on failure (e.g. can't create a new process). 5193int os::fork_and_exec(char* cmd) { 5194 STARTUPINFO si; 5195 PROCESS_INFORMATION pi; 5196 5197 memset(&si, 0, sizeof(si)); 5198 si.cb = sizeof(si); 5199 memset(&pi, 0, sizeof(pi)); 5200 BOOL rslt = CreateProcess(NULL, // executable name - use command line 5201 cmd, // command line 5202 NULL, // process security attribute 5203 NULL, // thread security attribute 5204 TRUE, // inherits system handles 5205 0, // no creation flags 5206 NULL, // use parent's environment block 5207 NULL, // use parent's starting directory 5208 &si, // (in) startup information 5209 &pi); // (out) process information 5210 5211 if (rslt) { 5212 // Wait until child process exits. 5213 WaitForSingleObject(pi.hProcess, INFINITE); 5214 5215 DWORD exit_code; 5216 GetExitCodeProcess(pi.hProcess, &exit_code); 5217 5218 // Close process and thread handles. 5219 CloseHandle(pi.hProcess); 5220 CloseHandle(pi.hThread); 5221 5222 return (int)exit_code; 5223 } else { 5224 return -1; 5225 } 5226} 5227 5228//-------------------------------------------------------------------------------------------------- 5229// Non-product code 5230 5231static int mallocDebugIntervalCounter = 0; 5232static int mallocDebugCounter = 0; 5233bool os::check_heap(bool force) { 5234 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 5235 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 5236 // Note: HeapValidate executes two hardware breakpoints when it finds something 5237 // wrong; at these points, eax contains the address of the offending block (I think). 5238 // To get to the exlicit error message(s) below, just continue twice. 5239 // 5240 // Note: we want to check the CRT heap, which is not necessarily located in the 5241 // process default heap. 5242 HANDLE heap = (HANDLE) _get_heap_handle(); 5243 if (!heap) { 5244 return true; 5245 } 5246 5247 // If we fail to lock the heap, then gflags.exe has been used 5248 // or some other special heap flag has been set that prevents 5249 // locking. We don't try to walk a heap we can't lock. 5250 if (HeapLock(heap) != 0) { 5251 PROCESS_HEAP_ENTRY phe; 5252 phe.lpData = NULL; 5253 while (HeapWalk(heap, &phe) != 0) { 5254 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 5255 !HeapValidate(heap, 0, phe.lpData)) { 5256 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 5257 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 5258 HeapUnlock(heap); 5259 fatal("corrupted C heap"); 5260 } 5261 } 5262 DWORD err = GetLastError(); 5263 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 5264 HeapUnlock(heap); 5265 fatal("heap walk aborted with error %d", err); 5266 } 5267 HeapUnlock(heap); 5268 } 5269 mallocDebugIntervalCounter = 0; 5270 } 5271 return true; 5272} 5273 5274 5275bool os::find(address addr, outputStream* st) { 5276 // Nothing yet 5277 return false; 5278} 5279 5280LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 5281 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 5282 5283 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 5284 JavaThread* thread = JavaThread::current(); 5285 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 5286 address addr = (address) exceptionRecord->ExceptionInformation[1]; 5287 5288 if (os::is_memory_serialize_page(thread, addr)) { 5289 return EXCEPTION_CONTINUE_EXECUTION; 5290 } 5291 } 5292 5293 return EXCEPTION_CONTINUE_SEARCH; 5294} 5295 5296// We don't build a headless jre for Windows 5297bool os::is_headless_jre() { return false; } 5298 5299static jint initSock() { 5300 WSADATA wsadata; 5301 5302 if (!os::WinSock2Dll::WinSock2Available()) { 5303 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n", 5304 ::GetLastError()); 5305 return JNI_ERR; 5306 } 5307 5308 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) { 5309 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n", 5310 ::GetLastError()); 5311 return JNI_ERR; 5312 } 5313 return JNI_OK; 5314} 5315 5316struct hostent* os::get_host_by_name(char* name) { 5317 return (struct hostent*)os::WinSock2Dll::gethostbyname(name); 5318} 5319 5320int os::socket_close(int fd) { 5321 return ::closesocket(fd); 5322} 5323 5324int os::socket(int domain, int type, int protocol) { 5325 return ::socket(domain, type, protocol); 5326} 5327 5328int os::connect(int fd, struct sockaddr* him, socklen_t len) { 5329 return ::connect(fd, him, len); 5330} 5331 5332int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5333 return ::recv(fd, buf, (int)nBytes, flags); 5334} 5335 5336int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5337 return ::send(fd, buf, (int)nBytes, flags); 5338} 5339 5340int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5341 return ::send(fd, buf, (int)nBytes, flags); 5342} 5343 5344// WINDOWS CONTEXT Flags for THREAD_SAMPLING 5345#if defined(IA32) 5346 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS) 5347#elif defined (AMD64) 5348 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT) 5349#endif 5350 5351// returns true if thread could be suspended, 5352// false otherwise 5353static bool do_suspend(HANDLE* h) { 5354 if (h != NULL) { 5355 if (SuspendThread(*h) != ~0) { 5356 return true; 5357 } 5358 } 5359 return false; 5360} 5361 5362// resume the thread 5363// calling resume on an active thread is a no-op 5364static void do_resume(HANDLE* h) { 5365 if (h != NULL) { 5366 ResumeThread(*h); 5367 } 5368} 5369 5370// retrieve a suspend/resume context capable handle 5371// from the tid. Caller validates handle return value. 5372void get_thread_handle_for_extended_context(HANDLE* h, 5373 OSThread::thread_id_t tid) { 5374 if (h != NULL) { 5375 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid); 5376 } 5377} 5378 5379// Thread sampling implementation 5380// 5381void os::SuspendedThreadTask::internal_do_task() { 5382 CONTEXT ctxt; 5383 HANDLE h = NULL; 5384 5385 // get context capable handle for thread 5386 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id()); 5387 5388 // sanity 5389 if (h == NULL || h == INVALID_HANDLE_VALUE) { 5390 return; 5391 } 5392 5393 // suspend the thread 5394 if (do_suspend(&h)) { 5395 ctxt.ContextFlags = sampling_context_flags; 5396 // get thread context 5397 GetThreadContext(h, &ctxt); 5398 SuspendedThreadTaskContext context(_thread, &ctxt); 5399 // pass context to Thread Sampling impl 5400 do_task(context); 5401 // resume thread 5402 do_resume(&h); 5403 } 5404 5405 // close handle 5406 CloseHandle(h); 5407} 5408 5409 5410// Kernel32 API 5411typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void); 5412typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD); 5413typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG); 5414typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG); 5415typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG); 5416 5417GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL; 5418VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL; 5419GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL; 5420GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL; 5421RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL; 5422 5423 5424BOOL os::Kernel32Dll::initialized = FALSE; 5425SIZE_T os::Kernel32Dll::GetLargePageMinimum() { 5426 assert(initialized && _GetLargePageMinimum != NULL, 5427 "GetLargePageMinimumAvailable() not yet called"); 5428 return _GetLargePageMinimum(); 5429} 5430 5431BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() { 5432 if (!initialized) { 5433 initialize(); 5434 } 5435 return _GetLargePageMinimum != NULL; 5436} 5437 5438BOOL os::Kernel32Dll::NumaCallsAvailable() { 5439 if (!initialized) { 5440 initialize(); 5441 } 5442 return _VirtualAllocExNuma != NULL; 5443} 5444 5445LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, 5446 SIZE_T bytes, DWORD flags, 5447 DWORD prot, DWORD node) { 5448 assert(initialized && _VirtualAllocExNuma != NULL, 5449 "NUMACallsAvailable() not yet called"); 5450 5451 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node); 5452} 5453 5454BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) { 5455 assert(initialized && _GetNumaHighestNodeNumber != NULL, 5456 "NUMACallsAvailable() not yet called"); 5457 5458 return _GetNumaHighestNodeNumber(ptr_highest_node_number); 5459} 5460 5461BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, 5462 PULONGLONG proc_mask) { 5463 assert(initialized && _GetNumaNodeProcessorMask != NULL, 5464 "NUMACallsAvailable() not yet called"); 5465 5466 return _GetNumaNodeProcessorMask(node, proc_mask); 5467} 5468 5469USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip, 5470 ULONG FrameToCapture, 5471 PVOID* BackTrace, 5472 PULONG BackTraceHash) { 5473 if (!initialized) { 5474 initialize(); 5475 } 5476 5477 if (_RtlCaptureStackBackTrace != NULL) { 5478 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture, 5479 BackTrace, BackTraceHash); 5480 } else { 5481 return 0; 5482 } 5483} 5484 5485void os::Kernel32Dll::initializeCommon() { 5486 if (!initialized) { 5487 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5488 assert(handle != NULL, "Just check"); 5489 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum"); 5490 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma"); 5491 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber"); 5492 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask"); 5493 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace"); 5494 initialized = TRUE; 5495 } 5496} 5497 5498bool os::start_debugging(char *buf, int buflen) { 5499 int len = (int)strlen(buf); 5500 char *p = &buf[len]; 5501 5502 jio_snprintf(p, buflen-len, 5503 "\n\n" 5504 "Do you want to debug the problem?\n\n" 5505 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n" 5506 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n" 5507 "Otherwise, select 'No' to abort...", 5508 os::current_process_id(), os::current_thread_id()); 5509 5510 bool yes = os::message_box("Unexpected Error", buf); 5511 5512 if (yes) { 5513 // os::breakpoint() calls DebugBreak(), which causes a breakpoint 5514 // exception. If VM is running inside a debugger, the debugger will 5515 // catch the exception. Otherwise, the breakpoint exception will reach 5516 // the default windows exception handler, which can spawn a debugger and 5517 // automatically attach to the dying VM. 5518 os::breakpoint(); 5519 yes = false; 5520 } 5521 return yes; 5522} 5523 5524#ifndef JDK6_OR_EARLIER 5525 5526void os::Kernel32Dll::initialize() { 5527 initializeCommon(); 5528} 5529 5530 5531// Kernel32 API 5532inline BOOL os::Kernel32Dll::SwitchToThread() { 5533 return ::SwitchToThread(); 5534} 5535 5536inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5537 return true; 5538} 5539 5540// Help tools 5541inline BOOL os::Kernel32Dll::HelpToolsAvailable() { 5542 return true; 5543} 5544 5545inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5546 DWORD th32ProcessId) { 5547 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5548} 5549 5550inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot, 5551 LPMODULEENTRY32 lpme) { 5552 return ::Module32First(hSnapshot, lpme); 5553} 5554 5555inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5556 LPMODULEENTRY32 lpme) { 5557 return ::Module32Next(hSnapshot, lpme); 5558} 5559 5560inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5561 ::GetNativeSystemInfo(lpSystemInfo); 5562} 5563 5564// PSAPI API 5565inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, 5566 HMODULE *lpModule, DWORD cb, 5567 LPDWORD lpcbNeeded) { 5568 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5569} 5570 5571inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, 5572 HMODULE hModule, 5573 LPTSTR lpFilename, 5574 DWORD nSize) { 5575 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5576} 5577 5578inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, 5579 HMODULE hModule, 5580 LPMODULEINFO lpmodinfo, 5581 DWORD cb) { 5582 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5583} 5584 5585inline BOOL os::PSApiDll::PSApiAvailable() { 5586 return true; 5587} 5588 5589 5590// WinSock2 API 5591inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, 5592 LPWSADATA lpWSAData) { 5593 return ::WSAStartup(wVersionRequested, lpWSAData); 5594} 5595 5596inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5597 return ::gethostbyname(name); 5598} 5599 5600inline BOOL os::WinSock2Dll::WinSock2Available() { 5601 return true; 5602} 5603 5604// Advapi API 5605inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5606 BOOL DisableAllPrivileges, 5607 PTOKEN_PRIVILEGES NewState, 5608 DWORD BufferLength, 5609 PTOKEN_PRIVILEGES PreviousState, 5610 PDWORD ReturnLength) { 5611 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5612 BufferLength, PreviousState, ReturnLength); 5613} 5614 5615inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5616 DWORD DesiredAccess, 5617 PHANDLE TokenHandle) { 5618 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5619} 5620 5621inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5622 LPCTSTR lpName, 5623 PLUID lpLuid) { 5624 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5625} 5626 5627inline BOOL os::Advapi32Dll::AdvapiAvailable() { 5628 return true; 5629} 5630 5631void* os::get_default_process_handle() { 5632 return (void*)GetModuleHandle(NULL); 5633} 5634 5635// Builds a platform dependent Agent_OnLoad_<lib_name> function name 5636// which is used to find statically linked in agents. 5637// Additionally for windows, takes into account __stdcall names. 5638// Parameters: 5639// sym_name: Symbol in library we are looking for 5640// lib_name: Name of library to look in, NULL for shared libs. 5641// is_absolute_path == true if lib_name is absolute path to agent 5642// such as "C:/a/b/L.dll" 5643// == false if only the base name of the library is passed in 5644// such as "L" 5645char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 5646 bool is_absolute_path) { 5647 char *agent_entry_name; 5648 size_t len; 5649 size_t name_len; 5650 size_t prefix_len = strlen(JNI_LIB_PREFIX); 5651 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 5652 const char *start; 5653 5654 if (lib_name != NULL) { 5655 len = name_len = strlen(lib_name); 5656 if (is_absolute_path) { 5657 // Need to strip path, prefix and suffix 5658 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 5659 lib_name = ++start; 5660 } else { 5661 // Need to check for drive prefix 5662 if ((start = strchr(lib_name, ':')) != NULL) { 5663 lib_name = ++start; 5664 } 5665 } 5666 if (len <= (prefix_len + suffix_len)) { 5667 return NULL; 5668 } 5669 lib_name += prefix_len; 5670 name_len = strlen(lib_name) - suffix_len; 5671 } 5672 } 5673 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 5674 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 5675 if (agent_entry_name == NULL) { 5676 return NULL; 5677 } 5678 if (lib_name != NULL) { 5679 const char *p = strrchr(sym_name, '@'); 5680 if (p != NULL && p != sym_name) { 5681 // sym_name == _Agent_OnLoad@XX 5682 strncpy(agent_entry_name, sym_name, (p - sym_name)); 5683 agent_entry_name[(p-sym_name)] = '\0'; 5684 // agent_entry_name == _Agent_OnLoad 5685 strcat(agent_entry_name, "_"); 5686 strncat(agent_entry_name, lib_name, name_len); 5687 strcat(agent_entry_name, p); 5688 // agent_entry_name == _Agent_OnLoad_lib_name@XX 5689 } else { 5690 strcpy(agent_entry_name, sym_name); 5691 strcat(agent_entry_name, "_"); 5692 strncat(agent_entry_name, lib_name, name_len); 5693 } 5694 } else { 5695 strcpy(agent_entry_name, sym_name); 5696 } 5697 return agent_entry_name; 5698} 5699 5700#else 5701// Kernel32 API 5702typedef BOOL (WINAPI* SwitchToThread_Fn)(void); 5703typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD); 5704typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32); 5705typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32); 5706typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO); 5707 5708SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL; 5709CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL; 5710Module32First_Fn os::Kernel32Dll::_Module32First = NULL; 5711Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL; 5712GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL; 5713 5714void os::Kernel32Dll::initialize() { 5715 if (!initialized) { 5716 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5717 assert(handle != NULL, "Just check"); 5718 5719 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread"); 5720 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn) 5721 ::GetProcAddress(handle, "CreateToolhelp32Snapshot"); 5722 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First"); 5723 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next"); 5724 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo"); 5725 initializeCommon(); // resolve the functions that always need resolving 5726 5727 initialized = TRUE; 5728 } 5729} 5730 5731BOOL os::Kernel32Dll::SwitchToThread() { 5732 assert(initialized && _SwitchToThread != NULL, 5733 "SwitchToThreadAvailable() not yet called"); 5734 return _SwitchToThread(); 5735} 5736 5737 5738BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5739 if (!initialized) { 5740 initialize(); 5741 } 5742 return _SwitchToThread != NULL; 5743} 5744 5745// Help tools 5746BOOL os::Kernel32Dll::HelpToolsAvailable() { 5747 if (!initialized) { 5748 initialize(); 5749 } 5750 return _CreateToolhelp32Snapshot != NULL && 5751 _Module32First != NULL && 5752 _Module32Next != NULL; 5753} 5754 5755HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5756 DWORD th32ProcessId) { 5757 assert(initialized && _CreateToolhelp32Snapshot != NULL, 5758 "HelpToolsAvailable() not yet called"); 5759 5760 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5761} 5762 5763BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5764 assert(initialized && _Module32First != NULL, 5765 "HelpToolsAvailable() not yet called"); 5766 5767 return _Module32First(hSnapshot, lpme); 5768} 5769 5770inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5771 LPMODULEENTRY32 lpme) { 5772 assert(initialized && _Module32Next != NULL, 5773 "HelpToolsAvailable() not yet called"); 5774 5775 return _Module32Next(hSnapshot, lpme); 5776} 5777 5778 5779BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() { 5780 if (!initialized) { 5781 initialize(); 5782 } 5783 return _GetNativeSystemInfo != NULL; 5784} 5785 5786void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5787 assert(initialized && _GetNativeSystemInfo != NULL, 5788 "GetNativeSystemInfoAvailable() not yet called"); 5789 5790 _GetNativeSystemInfo(lpSystemInfo); 5791} 5792 5793// PSAPI API 5794 5795 5796typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD); 5797typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD); 5798typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD); 5799 5800EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL; 5801GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL; 5802GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL; 5803BOOL os::PSApiDll::initialized = FALSE; 5804 5805void os::PSApiDll::initialize() { 5806 if (!initialized) { 5807 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0); 5808 if (handle != NULL) { 5809 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle, 5810 "EnumProcessModules"); 5811 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle, 5812 "GetModuleFileNameExA"); 5813 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle, 5814 "GetModuleInformation"); 5815 } 5816 initialized = TRUE; 5817 } 5818} 5819 5820 5821 5822BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, 5823 DWORD cb, LPDWORD lpcbNeeded) { 5824 assert(initialized && _EnumProcessModules != NULL, 5825 "PSApiAvailable() not yet called"); 5826 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5827} 5828 5829DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, 5830 LPTSTR lpFilename, DWORD nSize) { 5831 assert(initialized && _GetModuleFileNameEx != NULL, 5832 "PSApiAvailable() not yet called"); 5833 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5834} 5835 5836BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, 5837 LPMODULEINFO lpmodinfo, DWORD cb) { 5838 assert(initialized && _GetModuleInformation != NULL, 5839 "PSApiAvailable() not yet called"); 5840 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5841} 5842 5843BOOL os::PSApiDll::PSApiAvailable() { 5844 if (!initialized) { 5845 initialize(); 5846 } 5847 return _EnumProcessModules != NULL && 5848 _GetModuleFileNameEx != NULL && 5849 _GetModuleInformation != NULL; 5850} 5851 5852 5853// WinSock2 API 5854typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA); 5855typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...); 5856 5857WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL; 5858gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL; 5859BOOL os::WinSock2Dll::initialized = FALSE; 5860 5861void os::WinSock2Dll::initialize() { 5862 if (!initialized) { 5863 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0); 5864 if (handle != NULL) { 5865 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup"); 5866 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname"); 5867 } 5868 initialized = TRUE; 5869 } 5870} 5871 5872 5873BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) { 5874 assert(initialized && _WSAStartup != NULL, 5875 "WinSock2Available() not yet called"); 5876 return _WSAStartup(wVersionRequested, lpWSAData); 5877} 5878 5879struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5880 assert(initialized && _gethostbyname != NULL, 5881 "WinSock2Available() not yet called"); 5882 return _gethostbyname(name); 5883} 5884 5885BOOL os::WinSock2Dll::WinSock2Available() { 5886 if (!initialized) { 5887 initialize(); 5888 } 5889 return _WSAStartup != NULL && 5890 _gethostbyname != NULL; 5891} 5892 5893typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 5894typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE); 5895typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID); 5896 5897AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL; 5898OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL; 5899LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL; 5900BOOL os::Advapi32Dll::initialized = FALSE; 5901 5902void os::Advapi32Dll::initialize() { 5903 if (!initialized) { 5904 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0); 5905 if (handle != NULL) { 5906 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle, 5907 "AdjustTokenPrivileges"); 5908 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle, 5909 "OpenProcessToken"); 5910 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle, 5911 "LookupPrivilegeValueA"); 5912 } 5913 initialized = TRUE; 5914 } 5915} 5916 5917BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5918 BOOL DisableAllPrivileges, 5919 PTOKEN_PRIVILEGES NewState, 5920 DWORD BufferLength, 5921 PTOKEN_PRIVILEGES PreviousState, 5922 PDWORD ReturnLength) { 5923 assert(initialized && _AdjustTokenPrivileges != NULL, 5924 "AdvapiAvailable() not yet called"); 5925 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5926 BufferLength, PreviousState, ReturnLength); 5927} 5928 5929BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5930 DWORD DesiredAccess, 5931 PHANDLE TokenHandle) { 5932 assert(initialized && _OpenProcessToken != NULL, 5933 "AdvapiAvailable() not yet called"); 5934 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5935} 5936 5937BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5938 LPCTSTR lpName, PLUID lpLuid) { 5939 assert(initialized && _LookupPrivilegeValue != NULL, 5940 "AdvapiAvailable() not yet called"); 5941 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5942} 5943 5944BOOL os::Advapi32Dll::AdvapiAvailable() { 5945 if (!initialized) { 5946 initialize(); 5947 } 5948 return _AdjustTokenPrivileges != NULL && 5949 _OpenProcessToken != NULL && 5950 _LookupPrivilegeValue != NULL; 5951} 5952 5953#endif 5954 5955#ifndef PRODUCT 5956 5957// test the code path in reserve_memory_special() that tries to allocate memory in a single 5958// contiguous memory block at a particular address. 5959// The test first tries to find a good approximate address to allocate at by using the same 5960// method to allocate some memory at any address. The test then tries to allocate memory in 5961// the vicinity (not directly after it to avoid possible by-chance use of that location) 5962// This is of course only some dodgy assumption, there is no guarantee that the vicinity of 5963// the previously allocated memory is available for allocation. The only actual failure 5964// that is reported is when the test tries to allocate at a particular location but gets a 5965// different valid one. A NULL return value at this point is not considered an error but may 5966// be legitimate. 5967// If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages. 5968void TestReserveMemorySpecial_test() { 5969 if (!UseLargePages) { 5970 if (VerboseInternalVMTests) { 5971 gclog_or_tty->print("Skipping test because large pages are disabled"); 5972 } 5973 return; 5974 } 5975 // save current value of globals 5976 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; 5977 bool old_use_numa_interleaving = UseNUMAInterleaving; 5978 5979 // set globals to make sure we hit the correct code path 5980 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; 5981 5982 // do an allocation at an address selected by the OS to get a good one. 5983 const size_t large_allocation_size = os::large_page_size() * 4; 5984 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); 5985 if (result == NULL) { 5986 if (VerboseInternalVMTests) { 5987 gclog_or_tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.", 5988 large_allocation_size); 5989 } 5990 } else { 5991 os::release_memory_special(result, large_allocation_size); 5992 5993 // allocate another page within the recently allocated memory area which seems to be a good location. At least 5994 // we managed to get it once. 5995 const size_t expected_allocation_size = os::large_page_size(); 5996 char* expected_location = result + os::large_page_size(); 5997 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); 5998 if (actual_location == NULL) { 5999 if (VerboseInternalVMTests) { 6000 gclog_or_tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.", 6001 expected_location, large_allocation_size); 6002 } 6003 } else { 6004 // release memory 6005 os::release_memory_special(actual_location, expected_allocation_size); 6006 // only now check, after releasing any memory to avoid any leaks. 6007 assert(actual_location == expected_location, 6008 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead", 6009 expected_location, expected_allocation_size, actual_location); 6010 } 6011 } 6012 6013 // restore globals 6014 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; 6015 UseNUMAInterleaving = old_use_numa_interleaving; 6016} 6017#endif // PRODUCT 6018 6019/* 6020 All the defined signal names for Windows. 6021 6022 NOTE that not all of these names are accepted by FindSignal! 6023 6024 For various reasons some of these may be rejected at runtime. 6025 6026 Here are the names currently accepted by a user of sun.misc.Signal with 6027 1.4.1 (ignoring potential interaction with use of chaining, etc): 6028 6029 (LIST TBD) 6030 6031*/ 6032int os::get_signal_number(const char* name) { 6033 static const struct { 6034 char* name; 6035 int number; 6036 } siglabels [] = 6037 // derived from version 6.0 VC98/include/signal.h 6038 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl 6039 "FPE", SIGFPE, // floating point exception 6040 "SEGV", SIGSEGV, // segment violation 6041 "INT", SIGINT, // interrupt 6042 "TERM", SIGTERM, // software term signal from kill 6043 "BREAK", SIGBREAK, // Ctrl-Break sequence 6044 "ILL", SIGILL}; // illegal instruction 6045 for(int i=0;i<sizeof(siglabels)/sizeof(struct siglabel);i++) 6046 if(!strcmp(name, siglabels[i].name)) 6047 return siglabels[i].number; 6048 return -1; 6049} 6050 6051// Fast current thread access 6052 6053int os::win32::_thread_ptr_offset = 0; 6054 6055static void call_wrapper_dummy() {} 6056 6057// We need to call the os_exception_wrapper once so that it sets 6058// up the offset from FS of the thread pointer. 6059void os::win32::initialize_thread_ptr_offset() { 6060 os::os_exception_wrapper((java_call_t)call_wrapper_dummy, 6061 NULL, NULL, NULL, NULL); 6062} 6063