os_windows.cpp revision 7521:35e222a277ba
1/* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25// Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce 26#define _WIN32_WINNT 0x0600 27 28// no precompiled headers 29#include "classfile/classLoader.hpp" 30#include "classfile/systemDictionary.hpp" 31#include "classfile/vmSymbols.hpp" 32#include "code/icBuffer.hpp" 33#include "code/vtableStubs.hpp" 34#include "compiler/compileBroker.hpp" 35#include "compiler/disassembler.hpp" 36#include "interpreter/interpreter.hpp" 37#include "jvm_windows.h" 38#include "memory/allocation.inline.hpp" 39#include "memory/filemap.hpp" 40#include "mutex_windows.inline.hpp" 41#include "oops/oop.inline.hpp" 42#include "os_share_windows.hpp" 43#include "os_windows.inline.hpp" 44#include "prims/jniFastGetField.hpp" 45#include "prims/jvm.h" 46#include "prims/jvm_misc.hpp" 47#include "runtime/arguments.hpp" 48#include "runtime/atomic.inline.hpp" 49#include "runtime/extendedPC.hpp" 50#include "runtime/globals.hpp" 51#include "runtime/interfaceSupport.hpp" 52#include "runtime/java.hpp" 53#include "runtime/javaCalls.hpp" 54#include "runtime/mutexLocker.hpp" 55#include "runtime/objectMonitor.hpp" 56#include "runtime/orderAccess.inline.hpp" 57#include "runtime/osThread.hpp" 58#include "runtime/perfMemory.hpp" 59#include "runtime/sharedRuntime.hpp" 60#include "runtime/statSampler.hpp" 61#include "runtime/stubRoutines.hpp" 62#include "runtime/thread.inline.hpp" 63#include "runtime/threadCritical.hpp" 64#include "runtime/timer.hpp" 65#include "runtime/vm_version.hpp" 66#include "services/attachListener.hpp" 67#include "services/memTracker.hpp" 68#include "services/runtimeService.hpp" 69#include "utilities/decoder.hpp" 70#include "utilities/defaultStream.hpp" 71#include "utilities/events.hpp" 72#include "utilities/growableArray.hpp" 73#include "utilities/vmError.hpp" 74 75#ifdef _DEBUG 76#include <crtdbg.h> 77#endif 78 79 80#include <windows.h> 81#include <sys/types.h> 82#include <sys/stat.h> 83#include <sys/timeb.h> 84#include <objidl.h> 85#include <shlobj.h> 86 87#include <malloc.h> 88#include <signal.h> 89#include <direct.h> 90#include <errno.h> 91#include <fcntl.h> 92#include <io.h> 93#include <process.h> // For _beginthreadex(), _endthreadex() 94#include <imagehlp.h> // For os::dll_address_to_function_name 95// for enumerating dll libraries 96#include <vdmdbg.h> 97 98// for timer info max values which include all bits 99#define ALL_64_BITS CONST64(-1) 100 101// For DLL loading/load error detection 102// Values of PE COFF 103#define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c 104#define IMAGE_FILE_SIGNATURE_LENGTH 4 105 106static HANDLE main_process; 107static HANDLE main_thread; 108static int main_thread_id; 109 110static FILETIME process_creation_time; 111static FILETIME process_exit_time; 112static FILETIME process_user_time; 113static FILETIME process_kernel_time; 114 115#ifdef _M_IA64 116 #define __CPU__ ia64 117#elif _M_AMD64 118 #define __CPU__ amd64 119#else 120 #define __CPU__ i486 121#endif 122 123// save DLL module handle, used by GetModuleFileName 124 125HINSTANCE vm_lib_handle; 126 127BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { 128 switch (reason) { 129 case DLL_PROCESS_ATTACH: 130 vm_lib_handle = hinst; 131 if (ForceTimeHighResolution) { 132 timeBeginPeriod(1L); 133 } 134 break; 135 case DLL_PROCESS_DETACH: 136 if (ForceTimeHighResolution) { 137 timeEndPeriod(1L); 138 } 139 break; 140 default: 141 break; 142 } 143 return true; 144} 145 146static inline double fileTimeAsDouble(FILETIME* time) { 147 const double high = (double) ((unsigned int) ~0); 148 const double split = 10000000.0; 149 double result = (time->dwLowDateTime / split) + 150 time->dwHighDateTime * (high/split); 151 return result; 152} 153 154// Implementation of os 155 156bool os::getenv(const char* name, char* buffer, int len) { 157 int result = GetEnvironmentVariable(name, buffer, len); 158 return result > 0 && result < len; 159} 160 161bool os::unsetenv(const char* name) { 162 assert(name != NULL, "Null pointer"); 163 return (SetEnvironmentVariable(name, NULL) == TRUE); 164} 165 166// No setuid programs under Windows. 167bool os::have_special_privileges() { 168 return false; 169} 170 171 172// This method is a periodic task to check for misbehaving JNI applications 173// under CheckJNI, we can add any periodic checks here. 174// For Windows at the moment does nothing 175void os::run_periodic_checks() { 176 return; 177} 178 179// previous UnhandledExceptionFilter, if there is one 180static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL; 181 182LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 183 184void os::init_system_properties_values() { 185 // sysclasspath, java_home, dll_dir 186 { 187 char *home_path; 188 char *dll_path; 189 char *pslash; 190 char *bin = "\\bin"; 191 char home_dir[MAX_PATH]; 192 193 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) { 194 os::jvm_path(home_dir, sizeof(home_dir)); 195 // Found the full path to jvm.dll. 196 // Now cut the path to <java_home>/jre if we can. 197 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll 198 pslash = strrchr(home_dir, '\\'); 199 if (pslash != NULL) { 200 *pslash = '\0'; // get rid of \{client|server} 201 pslash = strrchr(home_dir, '\\'); 202 if (pslash != NULL) { 203 *pslash = '\0'; // get rid of \bin 204 } 205 } 206 } 207 208 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal); 209 if (home_path == NULL) { 210 return; 211 } 212 strcpy(home_path, home_dir); 213 Arguments::set_java_home(home_path); 214 FREE_C_HEAP_ARRAY(char, home_path); 215 216 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, 217 mtInternal); 218 if (dll_path == NULL) { 219 return; 220 } 221 strcpy(dll_path, home_dir); 222 strcat(dll_path, bin); 223 Arguments::set_dll_dir(dll_path); 224 FREE_C_HEAP_ARRAY(char, dll_path); 225 226 if (!set_boot_path('\\', ';')) { 227 return; 228 } 229 } 230 231// library_path 232#define EXT_DIR "\\lib\\ext" 233#define BIN_DIR "\\bin" 234#define PACKAGE_DIR "\\Sun\\Java" 235 { 236 // Win32 library search order (See the documentation for LoadLibrary): 237 // 238 // 1. The directory from which application is loaded. 239 // 2. The system wide Java Extensions directory (Java only) 240 // 3. System directory (GetSystemDirectory) 241 // 4. Windows directory (GetWindowsDirectory) 242 // 5. The PATH environment variable 243 // 6. The current directory 244 245 char *library_path; 246 char tmp[MAX_PATH]; 247 char *path_str = ::getenv("PATH"); 248 249 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 250 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal); 251 252 library_path[0] = '\0'; 253 254 GetModuleFileName(NULL, tmp, sizeof(tmp)); 255 *(strrchr(tmp, '\\')) = '\0'; 256 strcat(library_path, tmp); 257 258 GetWindowsDirectory(tmp, sizeof(tmp)); 259 strcat(library_path, ";"); 260 strcat(library_path, tmp); 261 strcat(library_path, PACKAGE_DIR BIN_DIR); 262 263 GetSystemDirectory(tmp, sizeof(tmp)); 264 strcat(library_path, ";"); 265 strcat(library_path, tmp); 266 267 GetWindowsDirectory(tmp, sizeof(tmp)); 268 strcat(library_path, ";"); 269 strcat(library_path, tmp); 270 271 if (path_str) { 272 strcat(library_path, ";"); 273 strcat(library_path, path_str); 274 } 275 276 strcat(library_path, ";."); 277 278 Arguments::set_library_path(library_path); 279 FREE_C_HEAP_ARRAY(char, library_path); 280 } 281 282 // Default extensions directory 283 { 284 char path[MAX_PATH]; 285 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 286 GetWindowsDirectory(path, MAX_PATH); 287 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 288 path, PACKAGE_DIR, EXT_DIR); 289 Arguments::set_ext_dirs(buf); 290 } 291 #undef EXT_DIR 292 #undef BIN_DIR 293 #undef PACKAGE_DIR 294 295#ifndef _WIN64 296 // set our UnhandledExceptionFilter and save any previous one 297 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception); 298#endif 299 300 // Done 301 return; 302} 303 304void os::breakpoint() { 305 DebugBreak(); 306} 307 308// Invoked from the BREAKPOINT Macro 309extern "C" void breakpoint() { 310 os::breakpoint(); 311} 312 313// RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP. 314// So far, this method is only used by Native Memory Tracking, which is 315// only supported on Windows XP or later. 316// 317int os::get_native_stack(address* stack, int frames, int toSkip) { 318#ifdef _NMT_NOINLINE_ 319 toSkip++; 320#endif 321 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames, 322 (PVOID*)stack, NULL); 323 for (int index = captured; index < frames; index ++) { 324 stack[index] = NULL; 325 } 326 return captured; 327} 328 329 330// os::current_stack_base() 331// 332// Returns the base of the stack, which is the stack's 333// starting address. This function must be called 334// while running on the stack of the thread being queried. 335 336address os::current_stack_base() { 337 MEMORY_BASIC_INFORMATION minfo; 338 address stack_bottom; 339 size_t stack_size; 340 341 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 342 stack_bottom = (address)minfo.AllocationBase; 343 stack_size = minfo.RegionSize; 344 345 // Add up the sizes of all the regions with the same 346 // AllocationBase. 347 while (1) { 348 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 349 if (stack_bottom == (address)minfo.AllocationBase) { 350 stack_size += minfo.RegionSize; 351 } else { 352 break; 353 } 354 } 355 356#ifdef _M_IA64 357 // IA64 has memory and register stacks 358 // 359 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit 360 // at thread creation (1MB backing store growing upwards, 1MB memory stack 361 // growing downwards, 2MB summed up) 362 // 363 // ... 364 // ------- top of stack (high address) ----- 365 // | 366 // | 1MB 367 // | Backing Store (Register Stack) 368 // | 369 // | / \ 370 // | | 371 // | | 372 // | | 373 // ------------------------ stack base ----- 374 // | 1MB 375 // | Memory Stack 376 // | 377 // | | 378 // | | 379 // | | 380 // | \ / 381 // | 382 // ----- bottom of stack (low address) ----- 383 // ... 384 385 stack_size = stack_size / 2; 386#endif 387 return stack_bottom + stack_size; 388} 389 390size_t os::current_stack_size() { 391 size_t sz; 392 MEMORY_BASIC_INFORMATION minfo; 393 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 394 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 395 return sz; 396} 397 398struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 399 const struct tm* time_struct_ptr = localtime(clock); 400 if (time_struct_ptr != NULL) { 401 *res = *time_struct_ptr; 402 return res; 403 } 404 return NULL; 405} 406 407LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 408 409// Thread start routine for all new Java threads 410static unsigned __stdcall java_start(Thread* thread) { 411 // Try to randomize the cache line index of hot stack frames. 412 // This helps when threads of the same stack traces evict each other's 413 // cache lines. The threads can be either from the same JVM instance, or 414 // from different JVM instances. The benefit is especially true for 415 // processors with hyperthreading technology. 416 static int counter = 0; 417 int pid = os::current_process_id(); 418 _alloca(((pid ^ counter++) & 7) * 128); 419 420 OSThread* osthr = thread->osthread(); 421 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 422 423 if (UseNUMA) { 424 int lgrp_id = os::numa_get_group_id(); 425 if (lgrp_id != -1) { 426 thread->set_lgrp_id(lgrp_id); 427 } 428 } 429 430 // Diagnostic code to investigate JDK-6573254 431 int res = 50115; // non-java thread 432 if (thread->is_Java_thread()) { 433 res = 40115; // java thread 434 } 435 436 // Install a win32 structured exception handler around every thread created 437 // by VM, so VM can generate error dump when an exception occurred in non- 438 // Java thread (e.g. VM thread). 439 __try { 440 thread->run(); 441 } __except(topLevelExceptionFilter( 442 (_EXCEPTION_POINTERS*)_exception_info())) { 443 // Nothing to do. 444 } 445 446 // One less thread is executing 447 // When the VMThread gets here, the main thread may have already exited 448 // which frees the CodeHeap containing the Atomic::add code 449 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 450 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); 451 } 452 453 // Thread must not return from exit_process_or_thread(), but if it does, 454 // let it proceed to exit normally 455 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res); 456} 457 458static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, 459 int thread_id) { 460 // Allocate the OSThread object 461 OSThread* osthread = new OSThread(NULL, NULL); 462 if (osthread == NULL) return NULL; 463 464 // Initialize support for Java interrupts 465 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 466 if (interrupt_event == NULL) { 467 delete osthread; 468 return NULL; 469 } 470 osthread->set_interrupt_event(interrupt_event); 471 472 // Store info on the Win32 thread into the OSThread 473 osthread->set_thread_handle(thread_handle); 474 osthread->set_thread_id(thread_id); 475 476 if (UseNUMA) { 477 int lgrp_id = os::numa_get_group_id(); 478 if (lgrp_id != -1) { 479 thread->set_lgrp_id(lgrp_id); 480 } 481 } 482 483 // Initial thread state is INITIALIZED, not SUSPENDED 484 osthread->set_state(INITIALIZED); 485 486 return osthread; 487} 488 489 490bool os::create_attached_thread(JavaThread* thread) { 491#ifdef ASSERT 492 thread->verify_not_published(); 493#endif 494 HANDLE thread_h; 495 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 496 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 497 fatal("DuplicateHandle failed\n"); 498 } 499 OSThread* osthread = create_os_thread(thread, thread_h, 500 (int)current_thread_id()); 501 if (osthread == NULL) { 502 return false; 503 } 504 505 // Initial thread state is RUNNABLE 506 osthread->set_state(RUNNABLE); 507 508 thread->set_osthread(osthread); 509 return true; 510} 511 512bool os::create_main_thread(JavaThread* thread) { 513#ifdef ASSERT 514 thread->verify_not_published(); 515#endif 516 if (_starting_thread == NULL) { 517 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 518 if (_starting_thread == NULL) { 519 return false; 520 } 521 } 522 523 // The primordial thread is runnable from the start) 524 _starting_thread->set_state(RUNNABLE); 525 526 thread->set_osthread(_starting_thread); 527 return true; 528} 529 530// Allocate and initialize a new OSThread 531bool os::create_thread(Thread* thread, ThreadType thr_type, 532 size_t stack_size) { 533 unsigned thread_id; 534 535 // Allocate the OSThread object 536 OSThread* osthread = new OSThread(NULL, NULL); 537 if (osthread == NULL) { 538 return false; 539 } 540 541 // Initialize support for Java interrupts 542 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 543 if (interrupt_event == NULL) { 544 delete osthread; 545 return NULL; 546 } 547 osthread->set_interrupt_event(interrupt_event); 548 osthread->set_interrupted(false); 549 550 thread->set_osthread(osthread); 551 552 if (stack_size == 0) { 553 switch (thr_type) { 554 case os::java_thread: 555 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 556 if (JavaThread::stack_size_at_create() > 0) { 557 stack_size = JavaThread::stack_size_at_create(); 558 } 559 break; 560 case os::compiler_thread: 561 if (CompilerThreadStackSize > 0) { 562 stack_size = (size_t)(CompilerThreadStackSize * K); 563 break; 564 } // else fall through: 565 // use VMThreadStackSize if CompilerThreadStackSize is not defined 566 case os::vm_thread: 567 case os::pgc_thread: 568 case os::cgc_thread: 569 case os::watcher_thread: 570 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 571 break; 572 } 573 } 574 575 // Create the Win32 thread 576 // 577 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 578 // does not specify stack size. Instead, it specifies the size of 579 // initially committed space. The stack size is determined by 580 // PE header in the executable. If the committed "stack_size" is larger 581 // than default value in the PE header, the stack is rounded up to the 582 // nearest multiple of 1MB. For example if the launcher has default 583 // stack size of 320k, specifying any size less than 320k does not 584 // affect the actual stack size at all, it only affects the initial 585 // commitment. On the other hand, specifying 'stack_size' larger than 586 // default value may cause significant increase in memory usage, because 587 // not only the stack space will be rounded up to MB, but also the 588 // entire space is committed upfront. 589 // 590 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 591 // for CreateThread() that can treat 'stack_size' as stack size. However we 592 // are not supposed to call CreateThread() directly according to MSDN 593 // document because JVM uses C runtime library. The good news is that the 594 // flag appears to work with _beginthredex() as well. 595 596#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION 597 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000) 598#endif 599 600 HANDLE thread_handle = 601 (HANDLE)_beginthreadex(NULL, 602 (unsigned)stack_size, 603 (unsigned (__stdcall *)(void*)) java_start, 604 thread, 605 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, 606 &thread_id); 607 if (thread_handle == NULL) { 608 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again 609 // without the flag. 610 thread_handle = 611 (HANDLE)_beginthreadex(NULL, 612 (unsigned)stack_size, 613 (unsigned (__stdcall *)(void*)) java_start, 614 thread, 615 CREATE_SUSPENDED, 616 &thread_id); 617 } 618 if (thread_handle == NULL) { 619 // Need to clean up stuff we've allocated so far 620 CloseHandle(osthread->interrupt_event()); 621 thread->set_osthread(NULL); 622 delete osthread; 623 return NULL; 624 } 625 626 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); 627 628 // Store info on the Win32 thread into the OSThread 629 osthread->set_thread_handle(thread_handle); 630 osthread->set_thread_id(thread_id); 631 632 // Initial thread state is INITIALIZED, not SUSPENDED 633 osthread->set_state(INITIALIZED); 634 635 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 636 return true; 637} 638 639 640// Free Win32 resources related to the OSThread 641void os::free_thread(OSThread* osthread) { 642 assert(osthread != NULL, "osthread not set"); 643 CloseHandle(osthread->thread_handle()); 644 CloseHandle(osthread->interrupt_event()); 645 delete osthread; 646} 647 648static jlong first_filetime; 649static jlong initial_performance_count; 650static jlong performance_frequency; 651 652 653jlong as_long(LARGE_INTEGER x) { 654 jlong result = 0; // initialization to avoid warning 655 set_high(&result, x.HighPart); 656 set_low(&result, x.LowPart); 657 return result; 658} 659 660 661jlong os::elapsed_counter() { 662 LARGE_INTEGER count; 663 if (win32::_has_performance_count) { 664 QueryPerformanceCounter(&count); 665 return as_long(count) - initial_performance_count; 666 } else { 667 FILETIME wt; 668 GetSystemTimeAsFileTime(&wt); 669 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime); 670 } 671} 672 673 674jlong os::elapsed_frequency() { 675 if (win32::_has_performance_count) { 676 return performance_frequency; 677 } else { 678 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601. 679 return 10000000; 680 } 681} 682 683 684julong os::available_memory() { 685 return win32::available_memory(); 686} 687 688julong os::win32::available_memory() { 689 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 690 // value if total memory is larger than 4GB 691 MEMORYSTATUSEX ms; 692 ms.dwLength = sizeof(ms); 693 GlobalMemoryStatusEx(&ms); 694 695 return (julong)ms.ullAvailPhys; 696} 697 698julong os::physical_memory() { 699 return win32::physical_memory(); 700} 701 702bool os::has_allocatable_memory_limit(julong* limit) { 703 MEMORYSTATUSEX ms; 704 ms.dwLength = sizeof(ms); 705 GlobalMemoryStatusEx(&ms); 706#ifdef _LP64 707 *limit = (julong)ms.ullAvailVirtual; 708 return true; 709#else 710 // Limit to 1400m because of the 2gb address space wall 711 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual); 712 return true; 713#endif 714} 715 716// VC6 lacks DWORD_PTR 717#if _MSC_VER < 1300 718typedef UINT_PTR DWORD_PTR; 719#endif 720 721int os::active_processor_count() { 722 DWORD_PTR lpProcessAffinityMask = 0; 723 DWORD_PTR lpSystemAffinityMask = 0; 724 int proc_count = processor_count(); 725 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 726 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 727 // Nof active processors is number of bits in process affinity mask 728 int bitcount = 0; 729 while (lpProcessAffinityMask != 0) { 730 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 731 bitcount++; 732 } 733 return bitcount; 734 } else { 735 return proc_count; 736 } 737} 738 739void os::set_native_thread_name(const char *name) { 740 741 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx 742 // 743 // Note that unfortunately this only works if the process 744 // is already attached to a debugger; debugger must observe 745 // the exception below to show the correct name. 746 747 const DWORD MS_VC_EXCEPTION = 0x406D1388; 748 struct { 749 DWORD dwType; // must be 0x1000 750 LPCSTR szName; // pointer to name (in user addr space) 751 DWORD dwThreadID; // thread ID (-1=caller thread) 752 DWORD dwFlags; // reserved for future use, must be zero 753 } info; 754 755 info.dwType = 0x1000; 756 info.szName = name; 757 info.dwThreadID = -1; 758 info.dwFlags = 0; 759 760 __try { 761 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info ); 762 } __except(EXCEPTION_CONTINUE_EXECUTION) {} 763} 764 765bool os::distribute_processes(uint length, uint* distribution) { 766 // Not yet implemented. 767 return false; 768} 769 770bool os::bind_to_processor(uint processor_id) { 771 // Not yet implemented. 772 return false; 773} 774 775void os::win32::initialize_performance_counter() { 776 LARGE_INTEGER count; 777 if (QueryPerformanceFrequency(&count)) { 778 win32::_has_performance_count = 1; 779 performance_frequency = as_long(count); 780 QueryPerformanceCounter(&count); 781 initial_performance_count = as_long(count); 782 } else { 783 win32::_has_performance_count = 0; 784 FILETIME wt; 785 GetSystemTimeAsFileTime(&wt); 786 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 787 } 788} 789 790 791double os::elapsedTime() { 792 return (double) elapsed_counter() / (double) elapsed_frequency(); 793} 794 795 796// Windows format: 797// The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 798// Java format: 799// Java standards require the number of milliseconds since 1/1/1970 800 801// Constant offset - calculated using offset() 802static jlong _offset = 116444736000000000; 803// Fake time counter for reproducible results when debugging 804static jlong fake_time = 0; 805 806#ifdef ASSERT 807// Just to be safe, recalculate the offset in debug mode 808static jlong _calculated_offset = 0; 809static int _has_calculated_offset = 0; 810 811jlong offset() { 812 if (_has_calculated_offset) return _calculated_offset; 813 SYSTEMTIME java_origin; 814 java_origin.wYear = 1970; 815 java_origin.wMonth = 1; 816 java_origin.wDayOfWeek = 0; // ignored 817 java_origin.wDay = 1; 818 java_origin.wHour = 0; 819 java_origin.wMinute = 0; 820 java_origin.wSecond = 0; 821 java_origin.wMilliseconds = 0; 822 FILETIME jot; 823 if (!SystemTimeToFileTime(&java_origin, &jot)) { 824 fatal(err_msg("Error = %d\nWindows error", GetLastError())); 825 } 826 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 827 _has_calculated_offset = 1; 828 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 829 return _calculated_offset; 830} 831#else 832jlong offset() { 833 return _offset; 834} 835#endif 836 837jlong windows_to_java_time(FILETIME wt) { 838 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 839 return (a - offset()) / 10000; 840} 841 842FILETIME java_to_windows_time(jlong l) { 843 jlong a = (l * 10000) + offset(); 844 FILETIME result; 845 result.dwHighDateTime = high(a); 846 result.dwLowDateTime = low(a); 847 return result; 848} 849 850bool os::supports_vtime() { return true; } 851bool os::enable_vtime() { return false; } 852bool os::vtime_enabled() { return false; } 853 854double os::elapsedVTime() { 855 FILETIME created; 856 FILETIME exited; 857 FILETIME kernel; 858 FILETIME user; 859 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) { 860 // the resolution of windows_to_java_time() should be sufficient (ms) 861 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS; 862 } else { 863 return elapsedTime(); 864 } 865} 866 867jlong os::javaTimeMillis() { 868 if (UseFakeTimers) { 869 return fake_time++; 870 } else { 871 FILETIME wt; 872 GetSystemTimeAsFileTime(&wt); 873 return windows_to_java_time(wt); 874 } 875} 876 877jlong os::javaTimeNanos() { 878 if (!win32::_has_performance_count) { 879 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do. 880 } else { 881 LARGE_INTEGER current_count; 882 QueryPerformanceCounter(¤t_count); 883 double current = as_long(current_count); 884 double freq = performance_frequency; 885 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC); 886 return time; 887 } 888} 889 890void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 891 if (!win32::_has_performance_count) { 892 // javaTimeMillis() doesn't have much percision, 893 // but it is not going to wrap -- so all 64 bits 894 info_ptr->max_value = ALL_64_BITS; 895 896 // this is a wall clock timer, so may skip 897 info_ptr->may_skip_backward = true; 898 info_ptr->may_skip_forward = true; 899 } else { 900 jlong freq = performance_frequency; 901 if (freq < NANOSECS_PER_SEC) { 902 // the performance counter is 64 bits and we will 903 // be multiplying it -- so no wrap in 64 bits 904 info_ptr->max_value = ALL_64_BITS; 905 } else if (freq > NANOSECS_PER_SEC) { 906 // use the max value the counter can reach to 907 // determine the max value which could be returned 908 julong max_counter = (julong)ALL_64_BITS; 909 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC)); 910 } else { 911 // the performance counter is 64 bits and we will 912 // be using it directly -- so no wrap in 64 bits 913 info_ptr->max_value = ALL_64_BITS; 914 } 915 916 // using a counter, so no skipping 917 info_ptr->may_skip_backward = false; 918 info_ptr->may_skip_forward = false; 919 } 920 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 921} 922 923char* os::local_time_string(char *buf, size_t buflen) { 924 SYSTEMTIME st; 925 GetLocalTime(&st); 926 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 927 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 928 return buf; 929} 930 931bool os::getTimesSecs(double* process_real_time, 932 double* process_user_time, 933 double* process_system_time) { 934 HANDLE h_process = GetCurrentProcess(); 935 FILETIME create_time, exit_time, kernel_time, user_time; 936 BOOL result = GetProcessTimes(h_process, 937 &create_time, 938 &exit_time, 939 &kernel_time, 940 &user_time); 941 if (result != 0) { 942 FILETIME wt; 943 GetSystemTimeAsFileTime(&wt); 944 jlong rtc_millis = windows_to_java_time(wt); 945 jlong user_millis = windows_to_java_time(user_time); 946 jlong system_millis = windows_to_java_time(kernel_time); 947 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 948 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); 949 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); 950 return true; 951 } else { 952 return false; 953 } 954} 955 956void os::shutdown() { 957 // allow PerfMemory to attempt cleanup of any persistent resources 958 perfMemory_exit(); 959 960 // flush buffered output, finish log files 961 ostream_abort(); 962 963 // Check for abort hook 964 abort_hook_t abort_hook = Arguments::abort_hook(); 965 if (abort_hook != NULL) { 966 abort_hook(); 967 } 968} 969 970 971static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 972 PMINIDUMP_EXCEPTION_INFORMATION, 973 PMINIDUMP_USER_STREAM_INFORMATION, 974 PMINIDUMP_CALLBACK_INFORMATION); 975 976void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) { 977 HINSTANCE dbghelp; 978 EXCEPTION_POINTERS ep; 979 MINIDUMP_EXCEPTION_INFORMATION mei; 980 MINIDUMP_EXCEPTION_INFORMATION* pmei; 981 982 HANDLE hProcess = GetCurrentProcess(); 983 DWORD processId = GetCurrentProcessId(); 984 HANDLE dumpFile; 985 MINIDUMP_TYPE dumpType; 986 static const char* cwd; 987 988// Default is to always create dump for debug builds, on product builds only dump on server versions of Windows. 989#ifndef ASSERT 990 // If running on a client version of Windows and user has not explicitly enabled dumping 991 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) { 992 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false); 993 return; 994 // If running on a server version of Windows and user has explictly disabled dumping 995 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) { 996 VMError::report_coredump_status("Minidump has been disabled from the command line", false); 997 return; 998 } 999#else 1000 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) { 1001 VMError::report_coredump_status("Minidump has been disabled from the command line", false); 1002 return; 1003 } 1004#endif 1005 1006 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0); 1007 1008 if (dbghelp == NULL) { 1009 VMError::report_coredump_status("Failed to load dbghelp.dll", false); 1010 return; 1011 } 1012 1013 _MiniDumpWriteDump = 1014 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 1015 PMINIDUMP_EXCEPTION_INFORMATION, 1016 PMINIDUMP_USER_STREAM_INFORMATION, 1017 PMINIDUMP_CALLBACK_INFORMATION), 1018 GetProcAddress(dbghelp, 1019 "MiniDumpWriteDump")); 1020 1021 if (_MiniDumpWriteDump == NULL) { 1022 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false); 1023 return; 1024 } 1025 1026 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData); 1027 1028// Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with 1029// API_VERSION_NUMBER 11 or higher contains the ones we want though 1030#if API_VERSION_NUMBER >= 11 1031 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | 1032 MiniDumpWithUnloadedModules); 1033#endif 1034 1035 cwd = get_current_directory(NULL, 0); 1036 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp", cwd, current_process_id()); 1037 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); 1038 1039 if (dumpFile == INVALID_HANDLE_VALUE) { 1040 VMError::report_coredump_status("Failed to create file for dumping", false); 1041 return; 1042 } 1043 if (exceptionRecord != NULL && contextRecord != NULL) { 1044 ep.ContextRecord = (PCONTEXT) contextRecord; 1045 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord; 1046 1047 mei.ThreadId = GetCurrentThreadId(); 1048 mei.ExceptionPointers = &ep; 1049 pmei = &mei; 1050 } else { 1051 pmei = NULL; 1052 } 1053 1054 1055 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all 1056 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then. 1057 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false && 1058 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) { 1059 DWORD error = GetLastError(); 1060 LPTSTR msgbuf = NULL; 1061 1062 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | 1063 FORMAT_MESSAGE_FROM_SYSTEM | 1064 FORMAT_MESSAGE_IGNORE_INSERTS, 1065 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) { 1066 1067 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf); 1068 LocalFree(msgbuf); 1069 } else { 1070 // Call to FormatMessage failed, just include the result from GetLastError 1071 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error); 1072 } 1073 VMError::report_coredump_status(buffer, false); 1074 } else { 1075 VMError::report_coredump_status(buffer, true); 1076 } 1077 1078 CloseHandle(dumpFile); 1079} 1080 1081 1082void os::abort(bool dump_core) { 1083 os::shutdown(); 1084 // no core dump on Windows 1085 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1086} 1087 1088// Die immediately, no exit hook, no abort hook, no cleanup. 1089void os::die() { 1090 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1); 1091} 1092 1093// Directory routines copied from src/win32/native/java/io/dirent_md.c 1094// * dirent_md.c 1.15 00/02/02 1095// 1096// The declarations for DIR and struct dirent are in jvm_win32.h. 1097 1098// Caller must have already run dirname through JVM_NativePath, which removes 1099// duplicate slashes and converts all instances of '/' into '\\'. 1100 1101DIR * os::opendir(const char *dirname) { 1102 assert(dirname != NULL, "just checking"); // hotspot change 1103 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal); 1104 DWORD fattr; // hotspot change 1105 char alt_dirname[4] = { 0, 0, 0, 0 }; 1106 1107 if (dirp == 0) { 1108 errno = ENOMEM; 1109 return 0; 1110 } 1111 1112 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it 1113 // as a directory in FindFirstFile(). We detect this case here and 1114 // prepend the current drive name. 1115 // 1116 if (dirname[1] == '\0' && dirname[0] == '\\') { 1117 alt_dirname[0] = _getdrive() + 'A' - 1; 1118 alt_dirname[1] = ':'; 1119 alt_dirname[2] = '\\'; 1120 alt_dirname[3] = '\0'; 1121 dirname = alt_dirname; 1122 } 1123 1124 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal); 1125 if (dirp->path == 0) { 1126 free(dirp); 1127 errno = ENOMEM; 1128 return 0; 1129 } 1130 strcpy(dirp->path, dirname); 1131 1132 fattr = GetFileAttributes(dirp->path); 1133 if (fattr == 0xffffffff) { 1134 free(dirp->path); 1135 free(dirp); 1136 errno = ENOENT; 1137 return 0; 1138 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 1139 free(dirp->path); 1140 free(dirp); 1141 errno = ENOTDIR; 1142 return 0; 1143 } 1144 1145 // Append "*.*", or possibly "\\*.*", to path 1146 if (dirp->path[1] == ':' && 1147 (dirp->path[2] == '\0' || 1148 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 1149 // No '\\' needed for cases like "Z:" or "Z:\" 1150 strcat(dirp->path, "*.*"); 1151 } else { 1152 strcat(dirp->path, "\\*.*"); 1153 } 1154 1155 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 1156 if (dirp->handle == INVALID_HANDLE_VALUE) { 1157 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 1158 free(dirp->path); 1159 free(dirp); 1160 errno = EACCES; 1161 return 0; 1162 } 1163 } 1164 return dirp; 1165} 1166 1167// parameter dbuf unused on Windows 1168struct dirent * os::readdir(DIR *dirp, dirent *dbuf) { 1169 assert(dirp != NULL, "just checking"); // hotspot change 1170 if (dirp->handle == INVALID_HANDLE_VALUE) { 1171 return 0; 1172 } 1173 1174 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 1175 1176 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 1177 if (GetLastError() == ERROR_INVALID_HANDLE) { 1178 errno = EBADF; 1179 return 0; 1180 } 1181 FindClose(dirp->handle); 1182 dirp->handle = INVALID_HANDLE_VALUE; 1183 } 1184 1185 return &dirp->dirent; 1186} 1187 1188int os::closedir(DIR *dirp) { 1189 assert(dirp != NULL, "just checking"); // hotspot change 1190 if (dirp->handle != INVALID_HANDLE_VALUE) { 1191 if (!FindClose(dirp->handle)) { 1192 errno = EBADF; 1193 return -1; 1194 } 1195 dirp->handle = INVALID_HANDLE_VALUE; 1196 } 1197 free(dirp->path); 1198 free(dirp); 1199 return 0; 1200} 1201 1202// This must be hard coded because it's the system's temporary 1203// directory not the java application's temp directory, ala java.io.tmpdir. 1204const char* os::get_temp_directory() { 1205 static char path_buf[MAX_PATH]; 1206 if (GetTempPath(MAX_PATH, path_buf) > 0) { 1207 return path_buf; 1208 } else { 1209 path_buf[0] = '\0'; 1210 return path_buf; 1211 } 1212} 1213 1214static bool file_exists(const char* filename) { 1215 if (filename == NULL || strlen(filename) == 0) { 1216 return false; 1217 } 1218 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES; 1219} 1220 1221bool os::dll_build_name(char *buffer, size_t buflen, 1222 const char* pname, const char* fname) { 1223 bool retval = false; 1224 const size_t pnamelen = pname ? strlen(pname) : 0; 1225 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0; 1226 1227 // Return error on buffer overflow. 1228 if (pnamelen + strlen(fname) + 10 > buflen) { 1229 return retval; 1230 } 1231 1232 if (pnamelen == 0) { 1233 jio_snprintf(buffer, buflen, "%s.dll", fname); 1234 retval = true; 1235 } else if (c == ':' || c == '\\') { 1236 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname); 1237 retval = true; 1238 } else if (strchr(pname, *os::path_separator()) != NULL) { 1239 int n; 1240 char** pelements = split_path(pname, &n); 1241 if (pelements == NULL) { 1242 return false; 1243 } 1244 for (int i = 0; i < n; i++) { 1245 char* path = pelements[i]; 1246 // Really shouldn't be NULL, but check can't hurt 1247 size_t plen = (path == NULL) ? 0 : strlen(path); 1248 if (plen == 0) { 1249 continue; // skip the empty path values 1250 } 1251 const char lastchar = path[plen - 1]; 1252 if (lastchar == ':' || lastchar == '\\') { 1253 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname); 1254 } else { 1255 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname); 1256 } 1257 if (file_exists(buffer)) { 1258 retval = true; 1259 break; 1260 } 1261 } 1262 // release the storage 1263 for (int i = 0; i < n; i++) { 1264 if (pelements[i] != NULL) { 1265 FREE_C_HEAP_ARRAY(char, pelements[i]); 1266 } 1267 } 1268 if (pelements != NULL) { 1269 FREE_C_HEAP_ARRAY(char*, pelements); 1270 } 1271 } else { 1272 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname); 1273 retval = true; 1274 } 1275 return retval; 1276} 1277 1278// Needs to be in os specific directory because windows requires another 1279// header file <direct.h> 1280const char* os::get_current_directory(char *buf, size_t buflen) { 1281 int n = static_cast<int>(buflen); 1282 if (buflen > INT_MAX) n = INT_MAX; 1283 return _getcwd(buf, n); 1284} 1285 1286//----------------------------------------------------------- 1287// Helper functions for fatal error handler 1288#ifdef _WIN64 1289// Helper routine which returns true if address in 1290// within the NTDLL address space. 1291// 1292static bool _addr_in_ntdll(address addr) { 1293 HMODULE hmod; 1294 MODULEINFO minfo; 1295 1296 hmod = GetModuleHandle("NTDLL.DLL"); 1297 if (hmod == NULL) return false; 1298 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod, 1299 &minfo, sizeof(MODULEINFO))) { 1300 return false; 1301 } 1302 1303 if ((addr >= minfo.lpBaseOfDll) && 1304 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) { 1305 return true; 1306 } else { 1307 return false; 1308 } 1309} 1310#endif 1311 1312struct _modinfo { 1313 address addr; 1314 char* full_path; // point to a char buffer 1315 int buflen; // size of the buffer 1316 address base_addr; 1317}; 1318 1319static int _locate_module_by_addr(const char * mod_fname, address base_addr, 1320 address top_address, void * param) { 1321 struct _modinfo *pmod = (struct _modinfo *)param; 1322 if (!pmod) return -1; 1323 1324 if (base_addr <= pmod->addr && 1325 top_address > pmod->addr) { 1326 // if a buffer is provided, copy path name to the buffer 1327 if (pmod->full_path) { 1328 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1329 } 1330 pmod->base_addr = base_addr; 1331 return 1; 1332 } 1333 return 0; 1334} 1335 1336bool os::dll_address_to_library_name(address addr, char* buf, 1337 int buflen, int* offset) { 1338 // buf is not optional, but offset is optional 1339 assert(buf != NULL, "sanity check"); 1340 1341// NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1342// return the full path to the DLL file, sometimes it returns path 1343// to the corresponding PDB file (debug info); sometimes it only 1344// returns partial path, which makes life painful. 1345 1346 struct _modinfo mi; 1347 mi.addr = addr; 1348 mi.full_path = buf; 1349 mi.buflen = buflen; 1350 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) { 1351 // buf already contains path name 1352 if (offset) *offset = addr - mi.base_addr; 1353 return true; 1354 } 1355 1356 buf[0] = '\0'; 1357 if (offset) *offset = -1; 1358 return false; 1359} 1360 1361bool os::dll_address_to_function_name(address addr, char *buf, 1362 int buflen, int *offset) { 1363 // buf is not optional, but offset is optional 1364 assert(buf != NULL, "sanity check"); 1365 1366 if (Decoder::decode(addr, buf, buflen, offset)) { 1367 return true; 1368 } 1369 if (offset != NULL) *offset = -1; 1370 buf[0] = '\0'; 1371 return false; 1372} 1373 1374// save the start and end address of jvm.dll into param[0] and param[1] 1375static int _locate_jvm_dll(const char* mod_fname, address base_addr, 1376 address top_address, void * param) { 1377 if (!param) return -1; 1378 1379 if (base_addr <= (address)_locate_jvm_dll && 1380 top_address > (address)_locate_jvm_dll) { 1381 ((address*)param)[0] = base_addr; 1382 ((address*)param)[1] = top_address; 1383 return 1; 1384 } 1385 return 0; 1386} 1387 1388address vm_lib_location[2]; // start and end address of jvm.dll 1389 1390// check if addr is inside jvm.dll 1391bool os::address_is_in_vm(address addr) { 1392 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1393 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) { 1394 assert(false, "Can't find jvm module."); 1395 return false; 1396 } 1397 } 1398 1399 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1400} 1401 1402// print module info; param is outputStream* 1403static int _print_module(const char* fname, address base_address, 1404 address top_address, void* param) { 1405 if (!param) return -1; 1406 1407 outputStream* st = (outputStream*)param; 1408 1409 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname); 1410 return 0; 1411} 1412 1413// Loads .dll/.so and 1414// in case of error it checks if .dll/.so was built for the 1415// same architecture as Hotspot is running on 1416void * os::dll_load(const char *name, char *ebuf, int ebuflen) { 1417 void * result = LoadLibrary(name); 1418 if (result != NULL) { 1419 return result; 1420 } 1421 1422 DWORD errcode = GetLastError(); 1423 if (errcode == ERROR_MOD_NOT_FOUND) { 1424 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1); 1425 ebuf[ebuflen - 1] = '\0'; 1426 return NULL; 1427 } 1428 1429 // Parsing dll below 1430 // If we can read dll-info and find that dll was built 1431 // for an architecture other than Hotspot is running in 1432 // - then print to buffer "DLL was built for a different architecture" 1433 // else call os::lasterror to obtain system error message 1434 1435 // Read system error message into ebuf 1436 // It may or may not be overwritten below (in the for loop and just above) 1437 lasterror(ebuf, (size_t) ebuflen); 1438 ebuf[ebuflen - 1] = '\0'; 1439 int fd = ::open(name, O_RDONLY | O_BINARY, 0); 1440 if (fd < 0) { 1441 return NULL; 1442 } 1443 1444 uint32_t signature_offset; 1445 uint16_t lib_arch = 0; 1446 bool failed_to_get_lib_arch = 1447 ( // Go to position 3c in the dll 1448 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0) 1449 || 1450 // Read location of signature 1451 (sizeof(signature_offset) != 1452 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset)))) 1453 || 1454 // Go to COFF File Header in dll 1455 // that is located after "signature" (4 bytes long) 1456 (os::seek_to_file_offset(fd, 1457 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0) 1458 || 1459 // Read field that contains code of architecture 1460 // that dll was built for 1461 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch)))) 1462 ); 1463 1464 ::close(fd); 1465 if (failed_to_get_lib_arch) { 1466 // file i/o error - report os::lasterror(...) msg 1467 return NULL; 1468 } 1469 1470 typedef struct { 1471 uint16_t arch_code; 1472 char* arch_name; 1473 } arch_t; 1474 1475 static const arch_t arch_array[] = { 1476 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1477 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1478 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1479 }; 1480#if (defined _M_IA64) 1481 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64; 1482#elif (defined _M_AMD64) 1483 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64; 1484#elif (defined _M_IX86) 1485 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386; 1486#else 1487 #error Method os::dll_load requires that one of following \ 1488 is defined :_M_IA64,_M_AMD64 or _M_IX86 1489#endif 1490 1491 1492 // Obtain a string for printf operation 1493 // lib_arch_str shall contain string what platform this .dll was built for 1494 // running_arch_str shall string contain what platform Hotspot was built for 1495 char *running_arch_str = NULL, *lib_arch_str = NULL; 1496 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) { 1497 if (lib_arch == arch_array[i].arch_code) { 1498 lib_arch_str = arch_array[i].arch_name; 1499 } 1500 if (running_arch == arch_array[i].arch_code) { 1501 running_arch_str = arch_array[i].arch_name; 1502 } 1503 } 1504 1505 assert(running_arch_str, 1506 "Didn't find running architecture code in arch_array"); 1507 1508 // If the architecture is right 1509 // but some other error took place - report os::lasterror(...) msg 1510 if (lib_arch == running_arch) { 1511 return NULL; 1512 } 1513 1514 if (lib_arch_str != NULL) { 1515 ::_snprintf(ebuf, ebuflen - 1, 1516 "Can't load %s-bit .dll on a %s-bit platform", 1517 lib_arch_str, running_arch_str); 1518 } else { 1519 // don't know what architecture this dll was build for 1520 ::_snprintf(ebuf, ebuflen - 1, 1521 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1522 lib_arch, running_arch_str); 1523 } 1524 1525 return NULL; 1526} 1527 1528void os::print_dll_info(outputStream *st) { 1529 st->print_cr("Dynamic libraries:"); 1530 get_loaded_modules_info(_print_module, (void *)st); 1531} 1532 1533int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1534 HANDLE hProcess; 1535 1536# define MAX_NUM_MODULES 128 1537 HMODULE modules[MAX_NUM_MODULES]; 1538 static char filename[MAX_PATH]; 1539 int result = 0; 1540 1541 if (!os::PSApiDll::PSApiAvailable()) { 1542 return 0; 1543 } 1544 1545 int pid = os::current_process_id(); 1546 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1547 FALSE, pid); 1548 if (hProcess == NULL) return 0; 1549 1550 DWORD size_needed; 1551 if (!os::PSApiDll::EnumProcessModules(hProcess, modules, 1552 sizeof(modules), &size_needed)) { 1553 CloseHandle(hProcess); 1554 return 0; 1555 } 1556 1557 // number of modules that are currently loaded 1558 int num_modules = size_needed / sizeof(HMODULE); 1559 1560 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1561 // Get Full pathname: 1562 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i], 1563 filename, sizeof(filename))) { 1564 filename[0] = '\0'; 1565 } 1566 1567 MODULEINFO modinfo; 1568 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i], 1569 &modinfo, sizeof(modinfo))) { 1570 modinfo.lpBaseOfDll = NULL; 1571 modinfo.SizeOfImage = 0; 1572 } 1573 1574 // Invoke callback function 1575 result = callback(filename, (address)modinfo.lpBaseOfDll, 1576 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param); 1577 if (result) break; 1578 } 1579 1580 CloseHandle(hProcess); 1581 return result; 1582} 1583 1584void os::print_os_info_brief(outputStream* st) { 1585 os::print_os_info(st); 1586} 1587 1588void os::print_os_info(outputStream* st) { 1589#ifdef ASSERT 1590 char buffer[1024]; 1591 DWORD size = sizeof(buffer); 1592 st->print(" HostName: "); 1593 if (GetComputerNameEx(ComputerNameDnsHostname, buffer, &size)) { 1594 st->print("%s", buffer); 1595 } else { 1596 st->print("N/A"); 1597 } 1598#endif 1599 st->print(" OS:"); 1600 os::win32::print_windows_version(st); 1601} 1602 1603void os::win32::print_windows_version(outputStream* st) { 1604 OSVERSIONINFOEX osvi; 1605 VS_FIXEDFILEINFO *file_info; 1606 TCHAR kernel32_path[MAX_PATH]; 1607 UINT len, ret; 1608 1609 // Use the GetVersionEx information to see if we're on a server or 1610 // workstation edition of Windows. Starting with Windows 8.1 we can't 1611 // trust the OS version information returned by this API. 1612 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1613 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1614 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1615 st->print_cr("Call to GetVersionEx failed"); 1616 return; 1617 } 1618 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION); 1619 1620 // Get the full path to \Windows\System32\kernel32.dll and use that for 1621 // determining what version of Windows we're running on. 1622 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1; 1623 ret = GetSystemDirectory(kernel32_path, len); 1624 if (ret == 0 || ret > len) { 1625 st->print_cr("Call to GetSystemDirectory failed"); 1626 return; 1627 } 1628 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret); 1629 1630 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL); 1631 if (version_size == 0) { 1632 st->print_cr("Call to GetFileVersionInfoSize failed"); 1633 return; 1634 } 1635 1636 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal); 1637 if (version_info == NULL) { 1638 st->print_cr("Failed to allocate version_info"); 1639 return; 1640 } 1641 1642 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) { 1643 os::free(version_info); 1644 st->print_cr("Call to GetFileVersionInfo failed"); 1645 return; 1646 } 1647 1648 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) { 1649 os::free(version_info); 1650 st->print_cr("Call to VerQueryValue failed"); 1651 return; 1652 } 1653 1654 int major_version = HIWORD(file_info->dwProductVersionMS); 1655 int minor_version = LOWORD(file_info->dwProductVersionMS); 1656 int build_number = HIWORD(file_info->dwProductVersionLS); 1657 int build_minor = LOWORD(file_info->dwProductVersionLS); 1658 int os_vers = major_version * 1000 + minor_version; 1659 os::free(version_info); 1660 1661 st->print(" Windows "); 1662 switch (os_vers) { 1663 1664 case 6000: 1665 if (is_workstation) { 1666 st->print("Vista"); 1667 } else { 1668 st->print("Server 2008"); 1669 } 1670 break; 1671 1672 case 6001: 1673 if (is_workstation) { 1674 st->print("7"); 1675 } else { 1676 st->print("Server 2008 R2"); 1677 } 1678 break; 1679 1680 case 6002: 1681 if (is_workstation) { 1682 st->print("8"); 1683 } else { 1684 st->print("Server 2012"); 1685 } 1686 break; 1687 1688 case 6003: 1689 if (is_workstation) { 1690 st->print("8.1"); 1691 } else { 1692 st->print("Server 2012 R2"); 1693 } 1694 break; 1695 1696 case 6004: 1697 if (is_workstation) { 1698 st->print("10"); 1699 } else { 1700 // The server version name of Windows 10 is not known at this time 1701 st->print("%d.%d", major_version, minor_version); 1702 } 1703 break; 1704 1705 default: 1706 // Unrecognized windows, print out its major and minor versions 1707 st->print("%d.%d", major_version, minor_version); 1708 break; 1709 } 1710 1711 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1712 // find out whether we are running on 64 bit processor or not 1713 SYSTEM_INFO si; 1714 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1715 os::Kernel32Dll::GetNativeSystemInfo(&si); 1716 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1717 st->print(" , 64 bit"); 1718 } 1719 1720 st->print(" Build %d", build_number); 1721 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor); 1722 st->cr(); 1723} 1724 1725void os::pd_print_cpu_info(outputStream* st) { 1726 // Nothing to do for now. 1727} 1728 1729void os::print_memory_info(outputStream* st) { 1730 st->print("Memory:"); 1731 st->print(" %dk page", os::vm_page_size()>>10); 1732 1733 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1734 // value if total memory is larger than 4GB 1735 MEMORYSTATUSEX ms; 1736 ms.dwLength = sizeof(ms); 1737 GlobalMemoryStatusEx(&ms); 1738 1739 st->print(", physical %uk", os::physical_memory() >> 10); 1740 st->print("(%uk free)", os::available_memory() >> 10); 1741 1742 st->print(", swap %uk", ms.ullTotalPageFile >> 10); 1743 st->print("(%uk free)", ms.ullAvailPageFile >> 10); 1744 st->cr(); 1745} 1746 1747void os::print_siginfo(outputStream *st, void *siginfo) { 1748 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1749 st->print("siginfo:"); 1750 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1751 1752 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1753 er->NumberParameters >= 2) { 1754 switch (er->ExceptionInformation[0]) { 1755 case 0: st->print(", reading address"); break; 1756 case 1: st->print(", writing address"); break; 1757 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1758 er->ExceptionInformation[0]); 1759 } 1760 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1761 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1762 er->NumberParameters >= 2 && UseSharedSpaces) { 1763 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1764 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1765 st->print("\n\nError accessing class data sharing archive." \ 1766 " Mapped file inaccessible during execution, " \ 1767 " possible disk/network problem."); 1768 } 1769 } else { 1770 int num = er->NumberParameters; 1771 if (num > 0) { 1772 st->print(", ExceptionInformation="); 1773 for (int i = 0; i < num; i++) { 1774 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1775 } 1776 } 1777 } 1778 st->cr(); 1779} 1780 1781void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1782 // do nothing 1783} 1784 1785static char saved_jvm_path[MAX_PATH] = {0}; 1786 1787// Find the full path to the current module, jvm.dll 1788void os::jvm_path(char *buf, jint buflen) { 1789 // Error checking. 1790 if (buflen < MAX_PATH) { 1791 assert(false, "must use a large-enough buffer"); 1792 buf[0] = '\0'; 1793 return; 1794 } 1795 // Lazy resolve the path to current module. 1796 if (saved_jvm_path[0] != 0) { 1797 strcpy(buf, saved_jvm_path); 1798 return; 1799 } 1800 1801 buf[0] = '\0'; 1802 if (Arguments::sun_java_launcher_is_altjvm()) { 1803 // Support for the java launcher's '-XXaltjvm=<path>' option. Check 1804 // for a JAVA_HOME environment variable and fix up the path so it 1805 // looks like jvm.dll is installed there (append a fake suffix 1806 // hotspot/jvm.dll). 1807 char* java_home_var = ::getenv("JAVA_HOME"); 1808 if (java_home_var != NULL && java_home_var[0] != 0 && 1809 strlen(java_home_var) < (size_t)buflen) { 1810 strncpy(buf, java_home_var, buflen); 1811 1812 // determine if this is a legacy image or modules image 1813 // modules image doesn't have "jre" subdirectory 1814 size_t len = strlen(buf); 1815 char* jrebin_p = buf + len; 1816 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1817 if (0 != _access(buf, 0)) { 1818 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1819 } 1820 len = strlen(buf); 1821 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1822 } 1823 } 1824 1825 if (buf[0] == '\0') { 1826 GetModuleFileName(vm_lib_handle, buf, buflen); 1827 } 1828 strncpy(saved_jvm_path, buf, MAX_PATH); 1829 saved_jvm_path[MAX_PATH - 1] = '\0'; 1830} 1831 1832 1833void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1834#ifndef _WIN64 1835 st->print("_"); 1836#endif 1837} 1838 1839 1840void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1841#ifndef _WIN64 1842 st->print("@%d", args_size * sizeof(int)); 1843#endif 1844} 1845 1846// This method is a copy of JDK's sysGetLastErrorString 1847// from src/windows/hpi/src/system_md.c 1848 1849size_t os::lasterror(char* buf, size_t len) { 1850 DWORD errval; 1851 1852 if ((errval = GetLastError()) != 0) { 1853 // DOS error 1854 size_t n = (size_t)FormatMessage( 1855 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1856 NULL, 1857 errval, 1858 0, 1859 buf, 1860 (DWORD)len, 1861 NULL); 1862 if (n > 3) { 1863 // Drop final '.', CR, LF 1864 if (buf[n - 1] == '\n') n--; 1865 if (buf[n - 1] == '\r') n--; 1866 if (buf[n - 1] == '.') n--; 1867 buf[n] = '\0'; 1868 } 1869 return n; 1870 } 1871 1872 if (errno != 0) { 1873 // C runtime error that has no corresponding DOS error code 1874 const char* s = strerror(errno); 1875 size_t n = strlen(s); 1876 if (n >= len) n = len - 1; 1877 strncpy(buf, s, n); 1878 buf[n] = '\0'; 1879 return n; 1880 } 1881 1882 return 0; 1883} 1884 1885int os::get_last_error() { 1886 DWORD error = GetLastError(); 1887 if (error == 0) { 1888 error = errno; 1889 } 1890 return (int)error; 1891} 1892 1893// sun.misc.Signal 1894// NOTE that this is a workaround for an apparent kernel bug where if 1895// a signal handler for SIGBREAK is installed then that signal handler 1896// takes priority over the console control handler for CTRL_CLOSE_EVENT. 1897// See bug 4416763. 1898static void (*sigbreakHandler)(int) = NULL; 1899 1900static void UserHandler(int sig, void *siginfo, void *context) { 1901 os::signal_notify(sig); 1902 // We need to reinstate the signal handler each time... 1903 os::signal(sig, (void*)UserHandler); 1904} 1905 1906void* os::user_handler() { 1907 return (void*) UserHandler; 1908} 1909 1910void* os::signal(int signal_number, void* handler) { 1911 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1912 void (*oldHandler)(int) = sigbreakHandler; 1913 sigbreakHandler = (void (*)(int)) handler; 1914 return (void*) oldHandler; 1915 } else { 1916 return (void*)::signal(signal_number, (void (*)(int))handler); 1917 } 1918} 1919 1920void os::signal_raise(int signal_number) { 1921 raise(signal_number); 1922} 1923 1924// The Win32 C runtime library maps all console control events other than ^C 1925// into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1926// logoff, and shutdown events. We therefore install our own console handler 1927// that raises SIGTERM for the latter cases. 1928// 1929static BOOL WINAPI consoleHandler(DWORD event) { 1930 switch (event) { 1931 case CTRL_C_EVENT: 1932 if (is_error_reported()) { 1933 // Ctrl-C is pressed during error reporting, likely because the error 1934 // handler fails to abort. Let VM die immediately. 1935 os::die(); 1936 } 1937 1938 os::signal_raise(SIGINT); 1939 return TRUE; 1940 break; 1941 case CTRL_BREAK_EVENT: 1942 if (sigbreakHandler != NULL) { 1943 (*sigbreakHandler)(SIGBREAK); 1944 } 1945 return TRUE; 1946 break; 1947 case CTRL_LOGOFF_EVENT: { 1948 // Don't terminate JVM if it is running in a non-interactive session, 1949 // such as a service process. 1950 USEROBJECTFLAGS flags; 1951 HANDLE handle = GetProcessWindowStation(); 1952 if (handle != NULL && 1953 GetUserObjectInformation(handle, UOI_FLAGS, &flags, 1954 sizeof(USEROBJECTFLAGS), NULL)) { 1955 // If it is a non-interactive session, let next handler to deal 1956 // with it. 1957 if ((flags.dwFlags & WSF_VISIBLE) == 0) { 1958 return FALSE; 1959 } 1960 } 1961 } 1962 case CTRL_CLOSE_EVENT: 1963 case CTRL_SHUTDOWN_EVENT: 1964 os::signal_raise(SIGTERM); 1965 return TRUE; 1966 break; 1967 default: 1968 break; 1969 } 1970 return FALSE; 1971} 1972 1973// The following code is moved from os.cpp for making this 1974// code platform specific, which it is by its very nature. 1975 1976// Return maximum OS signal used + 1 for internal use only 1977// Used as exit signal for signal_thread 1978int os::sigexitnum_pd() { 1979 return NSIG; 1980} 1981 1982// a counter for each possible signal value, including signal_thread exit signal 1983static volatile jint pending_signals[NSIG+1] = { 0 }; 1984static HANDLE sig_sem = NULL; 1985 1986void os::signal_init_pd() { 1987 // Initialize signal structures 1988 memset((void*)pending_signals, 0, sizeof(pending_signals)); 1989 1990 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 1991 1992 // Programs embedding the VM do not want it to attempt to receive 1993 // events like CTRL_LOGOFF_EVENT, which are used to implement the 1994 // shutdown hooks mechanism introduced in 1.3. For example, when 1995 // the VM is run as part of a Windows NT service (i.e., a servlet 1996 // engine in a web server), the correct behavior is for any console 1997 // control handler to return FALSE, not TRUE, because the OS's 1998 // "final" handler for such events allows the process to continue if 1999 // it is a service (while terminating it if it is not a service). 2000 // To make this behavior uniform and the mechanism simpler, we 2001 // completely disable the VM's usage of these console events if -Xrs 2002 // (=ReduceSignalUsage) is specified. This means, for example, that 2003 // the CTRL-BREAK thread dump mechanism is also disabled in this 2004 // case. See bugs 4323062, 4345157, and related bugs. 2005 2006 if (!ReduceSignalUsage) { 2007 // Add a CTRL-C handler 2008 SetConsoleCtrlHandler(consoleHandler, TRUE); 2009 } 2010} 2011 2012void os::signal_notify(int signal_number) { 2013 BOOL ret; 2014 if (sig_sem != NULL) { 2015 Atomic::inc(&pending_signals[signal_number]); 2016 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2017 assert(ret != 0, "ReleaseSemaphore() failed"); 2018 } 2019} 2020 2021static int check_pending_signals(bool wait_for_signal) { 2022 DWORD ret; 2023 while (true) { 2024 for (int i = 0; i < NSIG + 1; i++) { 2025 jint n = pending_signals[i]; 2026 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2027 return i; 2028 } 2029 } 2030 if (!wait_for_signal) { 2031 return -1; 2032 } 2033 2034 JavaThread *thread = JavaThread::current(); 2035 2036 ThreadBlockInVM tbivm(thread); 2037 2038 bool threadIsSuspended; 2039 do { 2040 thread->set_suspend_equivalent(); 2041 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2042 ret = ::WaitForSingleObject(sig_sem, INFINITE); 2043 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 2044 2045 // were we externally suspended while we were waiting? 2046 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2047 if (threadIsSuspended) { 2048 // The semaphore has been incremented, but while we were waiting 2049 // another thread suspended us. We don't want to continue running 2050 // while suspended because that would surprise the thread that 2051 // suspended us. 2052 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2053 assert(ret != 0, "ReleaseSemaphore() failed"); 2054 2055 thread->java_suspend_self(); 2056 } 2057 } while (threadIsSuspended); 2058 } 2059} 2060 2061int os::signal_lookup() { 2062 return check_pending_signals(false); 2063} 2064 2065int os::signal_wait() { 2066 return check_pending_signals(true); 2067} 2068 2069// Implicit OS exception handling 2070 2071LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, 2072 address handler) { 2073 JavaThread* thread = JavaThread::current(); 2074 // Save pc in thread 2075#ifdef _M_IA64 2076 // Do not blow up if no thread info available. 2077 if (thread) { 2078 // Saving PRECISE pc (with slot information) in thread. 2079 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress; 2080 // Convert precise PC into "Unix" format 2081 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2); 2082 thread->set_saved_exception_pc((address)precise_pc); 2083 } 2084 // Set pc to handler 2085 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 2086 // Clear out psr.ri (= Restart Instruction) in order to continue 2087 // at the beginning of the target bundle. 2088 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF; 2089 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!"); 2090#elif _M_AMD64 2091 // Do not blow up if no thread info available. 2092 if (thread) { 2093 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip); 2094 } 2095 // Set pc to handler 2096 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 2097#else 2098 // Do not blow up if no thread info available. 2099 if (thread) { 2100 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip); 2101 } 2102 // Set pc to handler 2103 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler; 2104#endif 2105 2106 // Continue the execution 2107 return EXCEPTION_CONTINUE_EXECUTION; 2108} 2109 2110 2111// Used for PostMortemDump 2112extern "C" void safepoints(); 2113extern "C" void find(int x); 2114extern "C" void events(); 2115 2116// According to Windows API documentation, an illegal instruction sequence should generate 2117// the 0xC000001C exception code. However, real world experience shows that occasionnaly 2118// the execution of an illegal instruction can generate the exception code 0xC000001E. This 2119// seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 2120 2121#define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 2122 2123// From "Execution Protection in the Windows Operating System" draft 0.35 2124// Once a system header becomes available, the "real" define should be 2125// included or copied here. 2126#define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2127 2128// Handle NAT Bit consumption on IA64. 2129#ifdef _M_IA64 2130 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION 2131#endif 2132 2133// Windows Vista/2008 heap corruption check 2134#define EXCEPTION_HEAP_CORRUPTION 0xC0000374 2135 2136#define def_excpt(val) #val, val 2137 2138struct siglabel { 2139 char *name; 2140 int number; 2141}; 2142 2143// All Visual C++ exceptions thrown from code generated by the Microsoft Visual 2144// C++ compiler contain this error code. Because this is a compiler-generated 2145// error, the code is not listed in the Win32 API header files. 2146// The code is actually a cryptic mnemonic device, with the initial "E" 2147// standing for "exception" and the final 3 bytes (0x6D7363) representing the 2148// ASCII values of "msc". 2149 2150#define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363 2151 2152 2153struct siglabel exceptlabels[] = { 2154 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2155 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2156 def_excpt(EXCEPTION_BREAKPOINT), 2157 def_excpt(EXCEPTION_SINGLE_STEP), 2158 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2159 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2160 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2161 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2162 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2163 def_excpt(EXCEPTION_FLT_OVERFLOW), 2164 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2165 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2166 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2167 def_excpt(EXCEPTION_INT_OVERFLOW), 2168 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2169 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2170 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2171 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2172 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2173 def_excpt(EXCEPTION_STACK_OVERFLOW), 2174 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2175 def_excpt(EXCEPTION_GUARD_PAGE), 2176 def_excpt(EXCEPTION_INVALID_HANDLE), 2177 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION), 2178 def_excpt(EXCEPTION_HEAP_CORRUPTION), 2179#ifdef _M_IA64 2180 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION), 2181#endif 2182 NULL, 0 2183}; 2184 2185const char* os::exception_name(int exception_code, char *buf, size_t size) { 2186 for (int i = 0; exceptlabels[i].name != NULL; i++) { 2187 if (exceptlabels[i].number == exception_code) { 2188 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2189 return buf; 2190 } 2191 } 2192 2193 return NULL; 2194} 2195 2196//----------------------------------------------------------------------------- 2197LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2198 // handle exception caused by idiv; should only happen for -MinInt/-1 2199 // (division by zero is handled explicitly) 2200#ifdef _M_IA64 2201 assert(0, "Fix Handle_IDiv_Exception"); 2202#elif _M_AMD64 2203 PCONTEXT ctx = exceptionInfo->ContextRecord; 2204 address pc = (address)ctx->Rip; 2205 assert(pc[0] == 0xF7, "not an idiv opcode"); 2206 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2207 assert(ctx->Rax == min_jint, "unexpected idiv exception"); 2208 // set correct result values and continue after idiv instruction 2209 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2210 ctx->Rax = (DWORD)min_jint; // result 2211 ctx->Rdx = (DWORD)0; // remainder 2212 // Continue the execution 2213#else 2214 PCONTEXT ctx = exceptionInfo->ContextRecord; 2215 address pc = (address)ctx->Eip; 2216 assert(pc[0] == 0xF7, "not an idiv opcode"); 2217 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2218 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2219 // set correct result values and continue after idiv instruction 2220 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2221 ctx->Eax = (DWORD)min_jint; // result 2222 ctx->Edx = (DWORD)0; // remainder 2223 // Continue the execution 2224#endif 2225 return EXCEPTION_CONTINUE_EXECUTION; 2226} 2227 2228//----------------------------------------------------------------------------- 2229LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2230 PCONTEXT ctx = exceptionInfo->ContextRecord; 2231#ifndef _WIN64 2232 // handle exception caused by native method modifying control word 2233 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2234 2235 switch (exception_code) { 2236 case EXCEPTION_FLT_DENORMAL_OPERAND: 2237 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2238 case EXCEPTION_FLT_INEXACT_RESULT: 2239 case EXCEPTION_FLT_INVALID_OPERATION: 2240 case EXCEPTION_FLT_OVERFLOW: 2241 case EXCEPTION_FLT_STACK_CHECK: 2242 case EXCEPTION_FLT_UNDERFLOW: 2243 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2244 if (fp_control_word != ctx->FloatSave.ControlWord) { 2245 // Restore FPCW and mask out FLT exceptions 2246 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2247 // Mask out pending FLT exceptions 2248 ctx->FloatSave.StatusWord &= 0xffffff00; 2249 return EXCEPTION_CONTINUE_EXECUTION; 2250 } 2251 } 2252 2253 if (prev_uef_handler != NULL) { 2254 // We didn't handle this exception so pass it to the previous 2255 // UnhandledExceptionFilter. 2256 return (prev_uef_handler)(exceptionInfo); 2257 } 2258#else // !_WIN64 2259 // On Windows, the mxcsr control bits are non-volatile across calls 2260 // See also CR 6192333 2261 // 2262 jint MxCsr = INITIAL_MXCSR; 2263 // we can't use StubRoutines::addr_mxcsr_std() 2264 // because in Win64 mxcsr is not saved there 2265 if (MxCsr != ctx->MxCsr) { 2266 ctx->MxCsr = MxCsr; 2267 return EXCEPTION_CONTINUE_EXECUTION; 2268 } 2269#endif // !_WIN64 2270 2271 return EXCEPTION_CONTINUE_SEARCH; 2272} 2273 2274static inline void report_error(Thread* t, DWORD exception_code, 2275 address addr, void* siginfo, void* context) { 2276 VMError err(t, exception_code, addr, siginfo, context); 2277 err.report_and_die(); 2278 2279 // If UseOsErrorReporting, this will return here and save the error file 2280 // somewhere where we can find it in the minidump. 2281} 2282 2283//----------------------------------------------------------------------------- 2284LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2285 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2286 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2287#ifdef _M_IA64 2288 // On Itanium, we need the "precise pc", which has the slot number coded 2289 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format). 2290 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress; 2291 // Convert the pc to "Unix format", which has the slot number coded 2292 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2 2293 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction" 2294 // information is saved in the Unix format. 2295 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2)); 2296#elif _M_AMD64 2297 address pc = (address) exceptionInfo->ContextRecord->Rip; 2298#else 2299 address pc = (address) exceptionInfo->ContextRecord->Eip; 2300#endif 2301 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 2302 2303 // Handle SafeFetch32 and SafeFetchN exceptions. 2304 if (StubRoutines::is_safefetch_fault(pc)) { 2305 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc)); 2306 } 2307 2308#ifndef _WIN64 2309 // Execution protection violation - win32 running on AMD64 only 2310 // Handled first to avoid misdiagnosis as a "normal" access violation; 2311 // This is safe to do because we have a new/unique ExceptionInformation 2312 // code for this condition. 2313 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2314 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2315 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2316 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2317 2318 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2319 int page_size = os::vm_page_size(); 2320 2321 // Make sure the pc and the faulting address are sane. 2322 // 2323 // If an instruction spans a page boundary, and the page containing 2324 // the beginning of the instruction is executable but the following 2325 // page is not, the pc and the faulting address might be slightly 2326 // different - we still want to unguard the 2nd page in this case. 2327 // 2328 // 15 bytes seems to be a (very) safe value for max instruction size. 2329 bool pc_is_near_addr = 2330 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2331 bool instr_spans_page_boundary = 2332 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2333 (intptr_t) page_size) > 0); 2334 2335 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2336 static volatile address last_addr = 2337 (address) os::non_memory_address_word(); 2338 2339 // In conservative mode, don't unguard unless the address is in the VM 2340 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2341 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2342 2343 // Set memory to RWX and retry 2344 address page_start = 2345 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2346 bool res = os::protect_memory((char*) page_start, page_size, 2347 os::MEM_PROT_RWX); 2348 2349 if (PrintMiscellaneous && Verbose) { 2350 char buf[256]; 2351 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 2352 "at " INTPTR_FORMAT 2353 ", unguarding " INTPTR_FORMAT ": %s", addr, 2354 page_start, (res ? "success" : strerror(errno))); 2355 tty->print_raw_cr(buf); 2356 } 2357 2358 // Set last_addr so if we fault again at the same address, we don't 2359 // end up in an endless loop. 2360 // 2361 // There are two potential complications here. Two threads trapping 2362 // at the same address at the same time could cause one of the 2363 // threads to think it already unguarded, and abort the VM. Likely 2364 // very rare. 2365 // 2366 // The other race involves two threads alternately trapping at 2367 // different addresses and failing to unguard the page, resulting in 2368 // an endless loop. This condition is probably even more unlikely 2369 // than the first. 2370 // 2371 // Although both cases could be avoided by using locks or thread 2372 // local last_addr, these solutions are unnecessary complication: 2373 // this handler is a best-effort safety net, not a complete solution. 2374 // It is disabled by default and should only be used as a workaround 2375 // in case we missed any no-execute-unsafe VM code. 2376 2377 last_addr = addr; 2378 2379 return EXCEPTION_CONTINUE_EXECUTION; 2380 } 2381 } 2382 2383 // Last unguard failed or not unguarding 2384 tty->print_raw_cr("Execution protection violation"); 2385 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2386 exceptionInfo->ContextRecord); 2387 return EXCEPTION_CONTINUE_SEARCH; 2388 } 2389 } 2390#endif // _WIN64 2391 2392 // Check to see if we caught the safepoint code in the 2393 // process of write protecting the memory serialization page. 2394 // It write enables the page immediately after protecting it 2395 // so just return. 2396 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2397 JavaThread* thread = (JavaThread*) t; 2398 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2399 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2400 if (os::is_memory_serialize_page(thread, addr)) { 2401 // Block current thread until the memory serialize page permission restored. 2402 os::block_on_serialize_page_trap(); 2403 return EXCEPTION_CONTINUE_EXECUTION; 2404 } 2405 } 2406 2407 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) && 2408 VM_Version::is_cpuinfo_segv_addr(pc)) { 2409 // Verify that OS save/restore AVX registers. 2410 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr()); 2411 } 2412 2413 if (t != NULL && t->is_Java_thread()) { 2414 JavaThread* thread = (JavaThread*) t; 2415 bool in_java = thread->thread_state() == _thread_in_Java; 2416 2417 // Handle potential stack overflows up front. 2418 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2419 if (os::uses_stack_guard_pages()) { 2420#ifdef _M_IA64 2421 // Use guard page for register stack. 2422 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2423 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2424 // Check for a register stack overflow on Itanium 2425 if (thread->addr_inside_register_stack_red_zone(addr)) { 2426 // Fatal red zone violation happens if the Java program 2427 // catches a StackOverflow error and does so much processing 2428 // that it runs beyond the unprotected yellow guard zone. As 2429 // a result, we are out of here. 2430 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit."); 2431 } else if(thread->addr_inside_register_stack(addr)) { 2432 // Disable the yellow zone which sets the state that 2433 // we've got a stack overflow problem. 2434 if (thread->stack_yellow_zone_enabled()) { 2435 thread->disable_stack_yellow_zone(); 2436 } 2437 // Give us some room to process the exception. 2438 thread->disable_register_stack_guard(); 2439 // Tracing with +Verbose. 2440 if (Verbose) { 2441 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc); 2442 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr); 2443 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base()); 2444 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]", 2445 thread->register_stack_base(), 2446 thread->register_stack_base() + thread->stack_size()); 2447 } 2448 2449 // Reguard the permanent register stack red zone just to be sure. 2450 // We saw Windows silently disabling this without telling us. 2451 thread->enable_register_stack_red_zone(); 2452 2453 return Handle_Exception(exceptionInfo, 2454 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2455 } 2456#endif 2457 if (thread->stack_yellow_zone_enabled()) { 2458 // Yellow zone violation. The o/s has unprotected the first yellow 2459 // zone page for us. Note: must call disable_stack_yellow_zone to 2460 // update the enabled status, even if the zone contains only one page. 2461 thread->disable_stack_yellow_zone(); 2462 // If not in java code, return and hope for the best. 2463 return in_java 2464 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2465 : EXCEPTION_CONTINUE_EXECUTION; 2466 } else { 2467 // Fatal red zone violation. 2468 thread->disable_stack_red_zone(); 2469 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2470 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2471 exceptionInfo->ContextRecord); 2472 return EXCEPTION_CONTINUE_SEARCH; 2473 } 2474 } else if (in_java) { 2475 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2476 // a one-time-only guard page, which it has released to us. The next 2477 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2478 return Handle_Exception(exceptionInfo, 2479 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2480 } else { 2481 // Can only return and hope for the best. Further stack growth will 2482 // result in an ACCESS_VIOLATION. 2483 return EXCEPTION_CONTINUE_EXECUTION; 2484 } 2485 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2486 // Either stack overflow or null pointer exception. 2487 if (in_java) { 2488 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2489 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2490 address stack_end = thread->stack_base() - thread->stack_size(); 2491 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2492 // Stack overflow. 2493 assert(!os::uses_stack_guard_pages(), 2494 "should be caught by red zone code above."); 2495 return Handle_Exception(exceptionInfo, 2496 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2497 } 2498 // Check for safepoint polling and implicit null 2499 // We only expect null pointers in the stubs (vtable) 2500 // the rest are checked explicitly now. 2501 CodeBlob* cb = CodeCache::find_blob(pc); 2502 if (cb != NULL) { 2503 if (os::is_poll_address(addr)) { 2504 address stub = SharedRuntime::get_poll_stub(pc); 2505 return Handle_Exception(exceptionInfo, stub); 2506 } 2507 } 2508 { 2509#ifdef _WIN64 2510 // If it's a legal stack address map the entire region in 2511 // 2512 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2513 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2514 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) { 2515 addr = (address)((uintptr_t)addr & 2516 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2517 os::commit_memory((char *)addr, thread->stack_base() - addr, 2518 !ExecMem); 2519 return EXCEPTION_CONTINUE_EXECUTION; 2520 } else 2521#endif 2522 { 2523 // Null pointer exception. 2524#ifdef _M_IA64 2525 // Process implicit null checks in compiled code. Note: Implicit null checks 2526 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs. 2527 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) { 2528 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format); 2529 // Handle implicit null check in UEP method entry 2530 if (cb && (cb->is_frame_complete_at(pc) || 2531 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) { 2532 if (Verbose) { 2533 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0); 2534 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format); 2535 tty->print_cr(" to addr " INTPTR_FORMAT, addr); 2536 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)", 2537 *(bundle_start + 1), *bundle_start); 2538 } 2539 return Handle_Exception(exceptionInfo, 2540 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL)); 2541 } 2542 } 2543 2544 // Implicit null checks were processed above. Hence, we should not reach 2545 // here in the usual case => die! 2546 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception"); 2547 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2548 exceptionInfo->ContextRecord); 2549 return EXCEPTION_CONTINUE_SEARCH; 2550 2551#else // !IA64 2552 2553 // Windows 98 reports faulting addresses incorrectly 2554 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2555 !os::win32::is_nt()) { 2556 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2557 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2558 } 2559 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2560 exceptionInfo->ContextRecord); 2561 return EXCEPTION_CONTINUE_SEARCH; 2562#endif 2563 } 2564 } 2565 } 2566 2567#ifdef _WIN64 2568 // Special care for fast JNI field accessors. 2569 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2570 // in and the heap gets shrunk before the field access. 2571 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2572 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2573 if (addr != (address)-1) { 2574 return Handle_Exception(exceptionInfo, addr); 2575 } 2576 } 2577#endif 2578 2579 // Stack overflow or null pointer exception in native code. 2580 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2581 exceptionInfo->ContextRecord); 2582 return EXCEPTION_CONTINUE_SEARCH; 2583 } // /EXCEPTION_ACCESS_VIOLATION 2584 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2585#if defined _M_IA64 2586 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION || 2587 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) { 2588 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0); 2589 2590 // Compiled method patched to be non entrant? Following conditions must apply: 2591 // 1. must be first instruction in bundle 2592 // 2. must be a break instruction with appropriate code 2593 if ((((uint64_t) pc & 0x0F) == 0) && 2594 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) { 2595 return Handle_Exception(exceptionInfo, 2596 (address)SharedRuntime::get_handle_wrong_method_stub()); 2597 } 2598 } // /EXCEPTION_ILLEGAL_INSTRUCTION 2599#endif 2600 2601 2602 if (in_java) { 2603 switch (exception_code) { 2604 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2605 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2606 2607 case EXCEPTION_INT_OVERFLOW: 2608 return Handle_IDiv_Exception(exceptionInfo); 2609 2610 } // switch 2611 } 2612 if (((thread->thread_state() == _thread_in_Java) || 2613 (thread->thread_state() == _thread_in_native)) && 2614 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) { 2615 LONG result=Handle_FLT_Exception(exceptionInfo); 2616 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2617 } 2618 } 2619 2620 if (exception_code != EXCEPTION_BREAKPOINT) { 2621 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2622 exceptionInfo->ContextRecord); 2623 } 2624 return EXCEPTION_CONTINUE_SEARCH; 2625} 2626 2627#ifndef _WIN64 2628// Special care for fast JNI accessors. 2629// jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2630// the heap gets shrunk before the field access. 2631// Need to install our own structured exception handler since native code may 2632// install its own. 2633LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2634 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2635 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2636 address pc = (address) exceptionInfo->ContextRecord->Eip; 2637 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2638 if (addr != (address)-1) { 2639 return Handle_Exception(exceptionInfo, addr); 2640 } 2641 } 2642 return EXCEPTION_CONTINUE_SEARCH; 2643} 2644 2645#define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \ 2646 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \ 2647 jobject obj, \ 2648 jfieldID fieldID) { \ 2649 __try { \ 2650 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \ 2651 obj, \ 2652 fieldID); \ 2653 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \ 2654 _exception_info())) { \ 2655 } \ 2656 return 0; \ 2657 } 2658 2659DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2660DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2661DEFINE_FAST_GETFIELD(jchar, char, Char) 2662DEFINE_FAST_GETFIELD(jshort, short, Short) 2663DEFINE_FAST_GETFIELD(jint, int, Int) 2664DEFINE_FAST_GETFIELD(jlong, long, Long) 2665DEFINE_FAST_GETFIELD(jfloat, float, Float) 2666DEFINE_FAST_GETFIELD(jdouble, double, Double) 2667 2668address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2669 switch (type) { 2670 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2671 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2672 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2673 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2674 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2675 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2676 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2677 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2678 default: ShouldNotReachHere(); 2679 } 2680 return (address)-1; 2681} 2682#endif 2683 2684void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) { 2685 // Install a win32 structured exception handler around the test 2686 // function call so the VM can generate an error dump if needed. 2687 __try { 2688 (*funcPtr)(); 2689 } __except(topLevelExceptionFilter( 2690 (_EXCEPTION_POINTERS*)_exception_info())) { 2691 // Nothing to do. 2692 } 2693} 2694 2695// Virtual Memory 2696 2697int os::vm_page_size() { return os::win32::vm_page_size(); } 2698int os::vm_allocation_granularity() { 2699 return os::win32::vm_allocation_granularity(); 2700} 2701 2702// Windows large page support is available on Windows 2003. In order to use 2703// large page memory, the administrator must first assign additional privilege 2704// to the user: 2705// + select Control Panel -> Administrative Tools -> Local Security Policy 2706// + select Local Policies -> User Rights Assignment 2707// + double click "Lock pages in memory", add users and/or groups 2708// + reboot 2709// Note the above steps are needed for administrator as well, as administrators 2710// by default do not have the privilege to lock pages in memory. 2711// 2712// Note about Windows 2003: although the API supports committing large page 2713// memory on a page-by-page basis and VirtualAlloc() returns success under this 2714// scenario, I found through experiment it only uses large page if the entire 2715// memory region is reserved and committed in a single VirtualAlloc() call. 2716// This makes Windows large page support more or less like Solaris ISM, in 2717// that the entire heap must be committed upfront. This probably will change 2718// in the future, if so the code below needs to be revisited. 2719 2720#ifndef MEM_LARGE_PAGES 2721 #define MEM_LARGE_PAGES 0x20000000 2722#endif 2723 2724static HANDLE _hProcess; 2725static HANDLE _hToken; 2726 2727// Container for NUMA node list info 2728class NUMANodeListHolder { 2729 private: 2730 int *_numa_used_node_list; // allocated below 2731 int _numa_used_node_count; 2732 2733 void free_node_list() { 2734 if (_numa_used_node_list != NULL) { 2735 FREE_C_HEAP_ARRAY(int, _numa_used_node_list); 2736 } 2737 } 2738 2739 public: 2740 NUMANodeListHolder() { 2741 _numa_used_node_count = 0; 2742 _numa_used_node_list = NULL; 2743 // do rest of initialization in build routine (after function pointers are set up) 2744 } 2745 2746 ~NUMANodeListHolder() { 2747 free_node_list(); 2748 } 2749 2750 bool build() { 2751 DWORD_PTR proc_aff_mask; 2752 DWORD_PTR sys_aff_mask; 2753 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false; 2754 ULONG highest_node_number; 2755 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false; 2756 free_node_list(); 2757 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal); 2758 for (unsigned int i = 0; i <= highest_node_number; i++) { 2759 ULONGLONG proc_mask_numa_node; 2760 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false; 2761 if ((proc_aff_mask & proc_mask_numa_node)!=0) { 2762 _numa_used_node_list[_numa_used_node_count++] = i; 2763 } 2764 } 2765 return (_numa_used_node_count > 1); 2766 } 2767 2768 int get_count() { return _numa_used_node_count; } 2769 int get_node_list_entry(int n) { 2770 // for indexes out of range, returns -1 2771 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1); 2772 } 2773 2774} numa_node_list_holder; 2775 2776 2777 2778static size_t _large_page_size = 0; 2779 2780static bool resolve_functions_for_large_page_init() { 2781 return os::Kernel32Dll::GetLargePageMinimumAvailable() && 2782 os::Advapi32Dll::AdvapiAvailable(); 2783} 2784 2785static bool request_lock_memory_privilege() { 2786 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2787 os::current_process_id()); 2788 2789 LUID luid; 2790 if (_hProcess != NULL && 2791 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2792 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2793 2794 TOKEN_PRIVILEGES tp; 2795 tp.PrivilegeCount = 1; 2796 tp.Privileges[0].Luid = luid; 2797 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2798 2799 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2800 // privilege. Check GetLastError() too. See MSDN document. 2801 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2802 (GetLastError() == ERROR_SUCCESS)) { 2803 return true; 2804 } 2805 } 2806 2807 return false; 2808} 2809 2810static void cleanup_after_large_page_init() { 2811 if (_hProcess) CloseHandle(_hProcess); 2812 _hProcess = NULL; 2813 if (_hToken) CloseHandle(_hToken); 2814 _hToken = NULL; 2815} 2816 2817static bool numa_interleaving_init() { 2818 bool success = false; 2819 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving); 2820 2821 // print a warning if UseNUMAInterleaving flag is specified on command line 2822 bool warn_on_failure = use_numa_interleaving_specified; 2823#define WARN(msg) if (warn_on_failure) { warning(msg); } 2824 2825 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages) 2826 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2827 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity); 2828 2829 if (os::Kernel32Dll::NumaCallsAvailable()) { 2830 if (numa_node_list_holder.build()) { 2831 if (PrintMiscellaneous && Verbose) { 2832 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count()); 2833 for (int i = 0; i < numa_node_list_holder.get_count(); i++) { 2834 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i)); 2835 } 2836 tty->print("\n"); 2837 } 2838 success = true; 2839 } else { 2840 WARN("Process does not cover multiple NUMA nodes."); 2841 } 2842 } else { 2843 WARN("NUMA Interleaving is not supported by the operating system."); 2844 } 2845 if (!success) { 2846 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag."); 2847 } 2848 return success; 2849#undef WARN 2850} 2851 2852// this routine is used whenever we need to reserve a contiguous VA range 2853// but we need to make separate VirtualAlloc calls for each piece of the range 2854// Reasons for doing this: 2855// * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise) 2856// * UseNUMAInterleaving requires a separate node for each piece 2857static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, 2858 DWORD prot, 2859 bool should_inject_error = false) { 2860 char * p_buf; 2861 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size 2862 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2863 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size; 2864 2865 // first reserve enough address space in advance since we want to be 2866 // able to break a single contiguous virtual address range into multiple 2867 // large page commits but WS2003 does not allow reserving large page space 2868 // so we just use 4K pages for reserve, this gives us a legal contiguous 2869 // address space. then we will deallocate that reservation, and re alloc 2870 // using large pages 2871 const size_t size_of_reserve = bytes + chunk_size; 2872 if (bytes > size_of_reserve) { 2873 // Overflowed. 2874 return NULL; 2875 } 2876 p_buf = (char *) VirtualAlloc(addr, 2877 size_of_reserve, // size of Reserve 2878 MEM_RESERVE, 2879 PAGE_READWRITE); 2880 // If reservation failed, return NULL 2881 if (p_buf == NULL) return NULL; 2882 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC); 2883 os::release_memory(p_buf, bytes + chunk_size); 2884 2885 // we still need to round up to a page boundary (in case we are using large pages) 2886 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size) 2887 // instead we handle this in the bytes_to_rq computation below 2888 p_buf = (char *) align_size_up((size_t)p_buf, page_size); 2889 2890 // now go through and allocate one chunk at a time until all bytes are 2891 // allocated 2892 size_t bytes_remaining = bytes; 2893 // An overflow of align_size_up() would have been caught above 2894 // in the calculation of size_of_reserve. 2895 char * next_alloc_addr = p_buf; 2896 HANDLE hProc = GetCurrentProcess(); 2897 2898#ifdef ASSERT 2899 // Variable for the failure injection 2900 long ran_num = os::random(); 2901 size_t fail_after = ran_num % bytes; 2902#endif 2903 2904 int count=0; 2905 while (bytes_remaining) { 2906 // select bytes_to_rq to get to the next chunk_size boundary 2907 2908 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size)); 2909 // Note allocate and commit 2910 char * p_new; 2911 2912#ifdef ASSERT 2913 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after); 2914#else 2915 const bool inject_error_now = false; 2916#endif 2917 2918 if (inject_error_now) { 2919 p_new = NULL; 2920 } else { 2921 if (!UseNUMAInterleaving) { 2922 p_new = (char *) VirtualAlloc(next_alloc_addr, 2923 bytes_to_rq, 2924 flags, 2925 prot); 2926 } else { 2927 // get the next node to use from the used_node_list 2928 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected"); 2929 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count()); 2930 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc, 2931 next_alloc_addr, 2932 bytes_to_rq, 2933 flags, 2934 prot, 2935 node); 2936 } 2937 } 2938 2939 if (p_new == NULL) { 2940 // Free any allocated pages 2941 if (next_alloc_addr > p_buf) { 2942 // Some memory was committed so release it. 2943 size_t bytes_to_release = bytes - bytes_remaining; 2944 // NMT has yet to record any individual blocks, so it 2945 // need to create a dummy 'reserve' record to match 2946 // the release. 2947 MemTracker::record_virtual_memory_reserve((address)p_buf, 2948 bytes_to_release, CALLER_PC); 2949 os::release_memory(p_buf, bytes_to_release); 2950 } 2951#ifdef ASSERT 2952 if (should_inject_error) { 2953 if (TracePageSizes && Verbose) { 2954 tty->print_cr("Reserving pages individually failed."); 2955 } 2956 } 2957#endif 2958 return NULL; 2959 } 2960 2961 bytes_remaining -= bytes_to_rq; 2962 next_alloc_addr += bytes_to_rq; 2963 count++; 2964 } 2965 // Although the memory is allocated individually, it is returned as one. 2966 // NMT records it as one block. 2967 if ((flags & MEM_COMMIT) != 0) { 2968 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC); 2969 } else { 2970 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC); 2971 } 2972 2973 // made it this far, success 2974 return p_buf; 2975} 2976 2977 2978 2979void os::large_page_init() { 2980 if (!UseLargePages) return; 2981 2982 // print a warning if any large page related flag is specified on command line 2983 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2984 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2985 bool success = false; 2986 2987#define WARN(msg) if (warn_on_failure) { warning(msg); } 2988 if (resolve_functions_for_large_page_init()) { 2989 if (request_lock_memory_privilege()) { 2990 size_t s = os::Kernel32Dll::GetLargePageMinimum(); 2991 if (s) { 2992#if defined(IA32) || defined(AMD64) 2993 if (s > 4*M || LargePageSizeInBytes > 4*M) { 2994 WARN("JVM cannot use large pages bigger than 4mb."); 2995 } else { 2996#endif 2997 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 2998 _large_page_size = LargePageSizeInBytes; 2999 } else { 3000 _large_page_size = s; 3001 } 3002 success = true; 3003#if defined(IA32) || defined(AMD64) 3004 } 3005#endif 3006 } else { 3007 WARN("Large page is not supported by the processor."); 3008 } 3009 } else { 3010 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 3011 } 3012 } else { 3013 WARN("Large page is not supported by the operating system."); 3014 } 3015#undef WARN 3016 3017 const size_t default_page_size = (size_t) vm_page_size(); 3018 if (success && _large_page_size > default_page_size) { 3019 _page_sizes[0] = _large_page_size; 3020 _page_sizes[1] = default_page_size; 3021 _page_sizes[2] = 0; 3022 } 3023 3024 cleanup_after_large_page_init(); 3025 UseLargePages = success; 3026} 3027 3028// On win32, one cannot release just a part of reserved memory, it's an 3029// all or nothing deal. When we split a reservation, we must break the 3030// reservation into two reservations. 3031void os::pd_split_reserved_memory(char *base, size_t size, size_t split, 3032 bool realloc) { 3033 if (size > 0) { 3034 release_memory(base, size); 3035 if (realloc) { 3036 reserve_memory(split, base); 3037 } 3038 if (size != split) { 3039 reserve_memory(size - split, base + split); 3040 } 3041 } 3042} 3043 3044// Multiple threads can race in this code but it's not possible to unmap small sections of 3045// virtual space to get requested alignment, like posix-like os's. 3046// Windows prevents multiple thread from remapping over each other so this loop is thread-safe. 3047char* os::reserve_memory_aligned(size_t size, size_t alignment) { 3048 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 3049 "Alignment must be a multiple of allocation granularity (page size)"); 3050 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 3051 3052 size_t extra_size = size + alignment; 3053 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 3054 3055 char* aligned_base = NULL; 3056 3057 do { 3058 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 3059 if (extra_base == NULL) { 3060 return NULL; 3061 } 3062 // Do manual alignment 3063 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 3064 3065 os::release_memory(extra_base, extra_size); 3066 3067 aligned_base = os::reserve_memory(size, aligned_base); 3068 3069 } while (aligned_base == NULL); 3070 3071 return aligned_base; 3072} 3073 3074char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 3075 assert((size_t)addr % os::vm_allocation_granularity() == 0, 3076 "reserve alignment"); 3077 assert(bytes % os::vm_page_size() == 0, "reserve page size"); 3078 char* res; 3079 // note that if UseLargePages is on, all the areas that require interleaving 3080 // will go thru reserve_memory_special rather than thru here. 3081 bool use_individual = (UseNUMAInterleaving && !UseLargePages); 3082 if (!use_individual) { 3083 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 3084 } else { 3085 elapsedTimer reserveTimer; 3086 if (Verbose && PrintMiscellaneous) reserveTimer.start(); 3087 // in numa interleaving, we have to allocate pages individually 3088 // (well really chunks of NUMAInterleaveGranularity size) 3089 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE); 3090 if (res == NULL) { 3091 warning("NUMA page allocation failed"); 3092 } 3093 if (Verbose && PrintMiscellaneous) { 3094 reserveTimer.stop(); 3095 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes, 3096 reserveTimer.milliseconds(), reserveTimer.ticks()); 3097 } 3098 } 3099 assert(res == NULL || addr == NULL || addr == res, 3100 "Unexpected address from reserve."); 3101 3102 return res; 3103} 3104 3105// Reserve memory at an arbitrary address, only if that area is 3106// available (and not reserved for something else). 3107char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3108 // Windows os::reserve_memory() fails of the requested address range is 3109 // not avilable. 3110 return reserve_memory(bytes, requested_addr); 3111} 3112 3113size_t os::large_page_size() { 3114 return _large_page_size; 3115} 3116 3117bool os::can_commit_large_page_memory() { 3118 // Windows only uses large page memory when the entire region is reserved 3119 // and committed in a single VirtualAlloc() call. This may change in the 3120 // future, but with Windows 2003 it's not possible to commit on demand. 3121 return false; 3122} 3123 3124bool os::can_execute_large_page_memory() { 3125 return true; 3126} 3127 3128char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, 3129 bool exec) { 3130 assert(UseLargePages, "only for large pages"); 3131 3132 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { 3133 return NULL; // Fallback to small pages. 3134 } 3135 3136 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 3137 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3138 3139 // with large pages, there are two cases where we need to use Individual Allocation 3140 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003) 3141 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page 3142 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) { 3143 if (TracePageSizes && Verbose) { 3144 tty->print_cr("Reserving large pages individually."); 3145 } 3146 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError); 3147 if (p_buf == NULL) { 3148 // give an appropriate warning message 3149 if (UseNUMAInterleaving) { 3150 warning("NUMA large page allocation failed, UseLargePages flag ignored"); 3151 } 3152 if (UseLargePagesIndividualAllocation) { 3153 warning("Individually allocated large pages failed, " 3154 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 3155 } 3156 return NULL; 3157 } 3158 3159 return p_buf; 3160 3161 } else { 3162 if (TracePageSizes && Verbose) { 3163 tty->print_cr("Reserving large pages in a single large chunk."); 3164 } 3165 // normal policy just allocate it all at once 3166 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3167 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); 3168 if (res != NULL) { 3169 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC); 3170 } 3171 3172 return res; 3173 } 3174} 3175 3176bool os::release_memory_special(char* base, size_t bytes) { 3177 assert(base != NULL, "Sanity check"); 3178 return release_memory(base, bytes); 3179} 3180 3181void os::print_statistics() { 3182} 3183 3184static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) { 3185 int err = os::get_last_error(); 3186 char buf[256]; 3187 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3188 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 3189 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3190 exec, buf_len != 0 ? buf : "<no_error_string>", err); 3191} 3192 3193bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 3194 if (bytes == 0) { 3195 // Don't bother the OS with noops. 3196 return true; 3197 } 3198 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 3199 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 3200 // Don't attempt to print anything if the OS call fails. We're 3201 // probably low on resources, so the print itself may cause crashes. 3202 3203 // unless we have NUMAInterleaving enabled, the range of a commit 3204 // is always within a reserve covered by a single VirtualAlloc 3205 // in that case we can just do a single commit for the requested size 3206 if (!UseNUMAInterleaving) { 3207 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) { 3208 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3209 return false; 3210 } 3211 if (exec) { 3212 DWORD oldprot; 3213 // Windows doc says to use VirtualProtect to get execute permissions 3214 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) { 3215 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3216 return false; 3217 } 3218 } 3219 return true; 3220 } else { 3221 3222 // when NUMAInterleaving is enabled, the commit might cover a range that 3223 // came from multiple VirtualAlloc reserves (using allocate_pages_individually). 3224 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery 3225 // returns represents the number of bytes that can be committed in one step. 3226 size_t bytes_remaining = bytes; 3227 char * next_alloc_addr = addr; 3228 while (bytes_remaining > 0) { 3229 MEMORY_BASIC_INFORMATION alloc_info; 3230 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info)); 3231 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3232 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, 3233 PAGE_READWRITE) == NULL) { 3234 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3235 exec);) 3236 return false; 3237 } 3238 if (exec) { 3239 DWORD oldprot; 3240 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, 3241 PAGE_EXECUTE_READWRITE, &oldprot)) { 3242 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3243 exec);) 3244 return false; 3245 } 3246 } 3247 bytes_remaining -= bytes_to_rq; 3248 next_alloc_addr += bytes_to_rq; 3249 } 3250 } 3251 // if we made it this far, return true 3252 return true; 3253} 3254 3255bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 3256 bool exec) { 3257 // alignment_hint is ignored on this OS 3258 return pd_commit_memory(addr, size, exec); 3259} 3260 3261void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 3262 const char* mesg) { 3263 assert(mesg != NULL, "mesg must be specified"); 3264 if (!pd_commit_memory(addr, size, exec)) { 3265 warn_fail_commit_memory(addr, size, exec); 3266 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); 3267 } 3268} 3269 3270void os::pd_commit_memory_or_exit(char* addr, size_t size, 3271 size_t alignment_hint, bool exec, 3272 const char* mesg) { 3273 // alignment_hint is ignored on this OS 3274 pd_commit_memory_or_exit(addr, size, exec, mesg); 3275} 3276 3277bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3278 if (bytes == 0) { 3279 // Don't bother the OS with noops. 3280 return true; 3281 } 3282 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 3283 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 3284 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0); 3285} 3286 3287bool os::pd_release_memory(char* addr, size_t bytes) { 3288 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 3289} 3290 3291bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 3292 return os::commit_memory(addr, size, !ExecMem); 3293} 3294 3295bool os::remove_stack_guard_pages(char* addr, size_t size) { 3296 return os::uncommit_memory(addr, size); 3297} 3298 3299// Set protections specified 3300bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3301 bool is_committed) { 3302 unsigned int p = 0; 3303 switch (prot) { 3304 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 3305 case MEM_PROT_READ: p = PAGE_READONLY; break; 3306 case MEM_PROT_RW: p = PAGE_READWRITE; break; 3307 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 3308 default: 3309 ShouldNotReachHere(); 3310 } 3311 3312 DWORD old_status; 3313 3314 // Strange enough, but on Win32 one can change protection only for committed 3315 // memory, not a big deal anyway, as bytes less or equal than 64K 3316 if (!is_committed) { 3317 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX, 3318 "cannot commit protection page"); 3319 } 3320 // One cannot use os::guard_memory() here, as on Win32 guard page 3321 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 3322 // 3323 // Pages in the region become guard pages. Any attempt to access a guard page 3324 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 3325 // the guard page status. Guard pages thus act as a one-time access alarm. 3326 return VirtualProtect(addr, bytes, p, &old_status) != 0; 3327} 3328 3329bool os::guard_memory(char* addr, size_t bytes) { 3330 DWORD old_status; 3331 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 3332} 3333 3334bool os::unguard_memory(char* addr, size_t bytes) { 3335 DWORD old_status; 3336 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 3337} 3338 3339void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3340void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3341void os::numa_make_global(char *addr, size_t bytes) { } 3342void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 3343bool os::numa_topology_changed() { return false; } 3344size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); } 3345int os::numa_get_group_id() { return 0; } 3346size_t os::numa_get_leaf_groups(int *ids, size_t size) { 3347 if (numa_node_list_holder.get_count() == 0 && size > 0) { 3348 // Provide an answer for UMA systems 3349 ids[0] = 0; 3350 return 1; 3351 } else { 3352 // check for size bigger than actual groups_num 3353 size = MIN2(size, numa_get_groups_num()); 3354 for (int i = 0; i < (int)size; i++) { 3355 ids[i] = numa_node_list_holder.get_node_list_entry(i); 3356 } 3357 return size; 3358 } 3359} 3360 3361bool os::get_page_info(char *start, page_info* info) { 3362 return false; 3363} 3364 3365char *os::scan_pages(char *start, char* end, page_info* page_expected, 3366 page_info* page_found) { 3367 return end; 3368} 3369 3370char* os::non_memory_address_word() { 3371 // Must never look like an address returned by reserve_memory, 3372 // even in its subfields (as defined by the CPU immediate fields, 3373 // if the CPU splits constants across multiple instructions). 3374 return (char*)-1; 3375} 3376 3377#define MAX_ERROR_COUNT 100 3378#define SYS_THREAD_ERROR 0xffffffffUL 3379 3380void os::pd_start_thread(Thread* thread) { 3381 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 3382 // Returns previous suspend state: 3383 // 0: Thread was not suspended 3384 // 1: Thread is running now 3385 // >1: Thread is still suspended. 3386 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3387} 3388 3389class HighResolutionInterval : public CHeapObj<mtThread> { 3390 // The default timer resolution seems to be 10 milliseconds. 3391 // (Where is this written down?) 3392 // If someone wants to sleep for only a fraction of the default, 3393 // then we set the timer resolution down to 1 millisecond for 3394 // the duration of their interval. 3395 // We carefully set the resolution back, since otherwise we 3396 // seem to incur an overhead (3%?) that we don't need. 3397 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 3398 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 3399 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 3400 // timeBeginPeriod() if the relative error exceeded some threshold. 3401 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 3402 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 3403 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 3404 // resolution timers running. 3405 private: 3406 jlong resolution; 3407 public: 3408 HighResolutionInterval(jlong ms) { 3409 resolution = ms % 10L; 3410 if (resolution != 0) { 3411 MMRESULT result = timeBeginPeriod(1L); 3412 } 3413 } 3414 ~HighResolutionInterval() { 3415 if (resolution != 0) { 3416 MMRESULT result = timeEndPeriod(1L); 3417 } 3418 resolution = 0L; 3419 } 3420}; 3421 3422int os::sleep(Thread* thread, jlong ms, bool interruptable) { 3423 jlong limit = (jlong) MAXDWORD; 3424 3425 while (ms > limit) { 3426 int res; 3427 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) { 3428 return res; 3429 } 3430 ms -= limit; 3431 } 3432 3433 assert(thread == Thread::current(), "thread consistency check"); 3434 OSThread* osthread = thread->osthread(); 3435 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 3436 int result; 3437 if (interruptable) { 3438 assert(thread->is_Java_thread(), "must be java thread"); 3439 JavaThread *jt = (JavaThread *) thread; 3440 ThreadBlockInVM tbivm(jt); 3441 3442 jt->set_suspend_equivalent(); 3443 // cleared by handle_special_suspend_equivalent_condition() or 3444 // java_suspend_self() via check_and_wait_while_suspended() 3445 3446 HANDLE events[1]; 3447 events[0] = osthread->interrupt_event(); 3448 HighResolutionInterval *phri=NULL; 3449 if (!ForceTimeHighResolution) { 3450 phri = new HighResolutionInterval(ms); 3451 } 3452 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 3453 result = OS_TIMEOUT; 3454 } else { 3455 ResetEvent(osthread->interrupt_event()); 3456 osthread->set_interrupted(false); 3457 result = OS_INTRPT; 3458 } 3459 delete phri; //if it is NULL, harmless 3460 3461 // were we externally suspended while we were waiting? 3462 jt->check_and_wait_while_suspended(); 3463 } else { 3464 assert(!thread->is_Java_thread(), "must not be java thread"); 3465 Sleep((long) ms); 3466 result = OS_TIMEOUT; 3467 } 3468 return result; 3469} 3470 3471// Short sleep, direct OS call. 3472// 3473// ms = 0, means allow others (if any) to run. 3474// 3475void os::naked_short_sleep(jlong ms) { 3476 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3477 Sleep(ms); 3478} 3479 3480// Sleep forever; naked call to OS-specific sleep; use with CAUTION 3481void os::infinite_sleep() { 3482 while (true) { // sleep forever ... 3483 Sleep(100000); // ... 100 seconds at a time 3484 } 3485} 3486 3487typedef BOOL (WINAPI * STTSignature)(void); 3488 3489void os::naked_yield() { 3490 // Use either SwitchToThread() or Sleep(0) 3491 // Consider passing back the return value from SwitchToThread(). 3492 if (os::Kernel32Dll::SwitchToThreadAvailable()) { 3493 SwitchToThread(); 3494 } else { 3495 Sleep(0); 3496 } 3497} 3498 3499// Win32 only gives you access to seven real priorities at a time, 3500// so we compress Java's ten down to seven. It would be better 3501// if we dynamically adjusted relative priorities. 3502 3503int os::java_to_os_priority[CriticalPriority + 1] = { 3504 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3505 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3506 THREAD_PRIORITY_LOWEST, // 2 3507 THREAD_PRIORITY_BELOW_NORMAL, // 3 3508 THREAD_PRIORITY_BELOW_NORMAL, // 4 3509 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3510 THREAD_PRIORITY_NORMAL, // 6 3511 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3512 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3513 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3514 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority 3515 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority 3516}; 3517 3518int prio_policy1[CriticalPriority + 1] = { 3519 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3520 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3521 THREAD_PRIORITY_LOWEST, // 2 3522 THREAD_PRIORITY_BELOW_NORMAL, // 3 3523 THREAD_PRIORITY_BELOW_NORMAL, // 4 3524 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3525 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3526 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3527 THREAD_PRIORITY_HIGHEST, // 8 3528 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3529 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority 3530 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority 3531}; 3532 3533static int prio_init() { 3534 // If ThreadPriorityPolicy is 1, switch tables 3535 if (ThreadPriorityPolicy == 1) { 3536 int i; 3537 for (i = 0; i < CriticalPriority + 1; i++) { 3538 os::java_to_os_priority[i] = prio_policy1[i]; 3539 } 3540 } 3541 if (UseCriticalJavaThreadPriority) { 3542 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 3543 } 3544 return 0; 3545} 3546 3547OSReturn os::set_native_priority(Thread* thread, int priority) { 3548 if (!UseThreadPriorities) return OS_OK; 3549 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3550 return ret ? OS_OK : OS_ERR; 3551} 3552 3553OSReturn os::get_native_priority(const Thread* const thread, 3554 int* priority_ptr) { 3555 if (!UseThreadPriorities) { 3556 *priority_ptr = java_to_os_priority[NormPriority]; 3557 return OS_OK; 3558 } 3559 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3560 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3561 assert(false, "GetThreadPriority failed"); 3562 return OS_ERR; 3563 } 3564 *priority_ptr = os_prio; 3565 return OS_OK; 3566} 3567 3568 3569// Hint to the underlying OS that a task switch would not be good. 3570// Void return because it's a hint and can fail. 3571void os::hint_no_preempt() {} 3572 3573void os::interrupt(Thread* thread) { 3574 assert(!thread->is_Java_thread() || Thread::current() == thread || 3575 Threads_lock->owned_by_self(), 3576 "possibility of dangling Thread pointer"); 3577 3578 OSThread* osthread = thread->osthread(); 3579 osthread->set_interrupted(true); 3580 // More than one thread can get here with the same value of osthread, 3581 // resulting in multiple notifications. We do, however, want the store 3582 // to interrupted() to be visible to other threads before we post 3583 // the interrupt event. 3584 OrderAccess::release(); 3585 SetEvent(osthread->interrupt_event()); 3586 // For JSR166: unpark after setting status 3587 if (thread->is_Java_thread()) { 3588 ((JavaThread*)thread)->parker()->unpark(); 3589 } 3590 3591 ParkEvent * ev = thread->_ParkEvent; 3592 if (ev != NULL) ev->unpark(); 3593} 3594 3595 3596bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3597 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3598 "possibility of dangling Thread pointer"); 3599 3600 OSThread* osthread = thread->osthread(); 3601 // There is no synchronization between the setting of the interrupt 3602 // and it being cleared here. It is critical - see 6535709 - that 3603 // we only clear the interrupt state, and reset the interrupt event, 3604 // if we are going to report that we were indeed interrupted - else 3605 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups 3606 // depending on the timing. By checking thread interrupt event to see 3607 // if the thread gets real interrupt thus prevent spurious wakeup. 3608 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0); 3609 if (interrupted && clear_interrupted) { 3610 osthread->set_interrupted(false); 3611 ResetEvent(osthread->interrupt_event()); 3612 } // Otherwise leave the interrupted state alone 3613 3614 return interrupted; 3615} 3616 3617// Get's a pc (hint) for a running thread. Currently used only for profiling. 3618ExtendedPC os::get_thread_pc(Thread* thread) { 3619 CONTEXT context; 3620 context.ContextFlags = CONTEXT_CONTROL; 3621 HANDLE handle = thread->osthread()->thread_handle(); 3622#ifdef _M_IA64 3623 assert(0, "Fix get_thread_pc"); 3624 return ExtendedPC(NULL); 3625#else 3626 if (GetThreadContext(handle, &context)) { 3627#ifdef _M_AMD64 3628 return ExtendedPC((address) context.Rip); 3629#else 3630 return ExtendedPC((address) context.Eip); 3631#endif 3632 } else { 3633 return ExtendedPC(NULL); 3634 } 3635#endif 3636} 3637 3638// GetCurrentThreadId() returns DWORD 3639intx os::current_thread_id() { return GetCurrentThreadId(); } 3640 3641static int _initial_pid = 0; 3642 3643int os::current_process_id() { 3644 return (_initial_pid ? _initial_pid : _getpid()); 3645} 3646 3647int os::win32::_vm_page_size = 0; 3648int os::win32::_vm_allocation_granularity = 0; 3649int os::win32::_processor_type = 0; 3650// Processor level is not available on non-NT systems, use vm_version instead 3651int os::win32::_processor_level = 0; 3652julong os::win32::_physical_memory = 0; 3653size_t os::win32::_default_stack_size = 0; 3654 3655intx os::win32::_os_thread_limit = 0; 3656volatile intx os::win32::_os_thread_count = 0; 3657 3658bool os::win32::_is_nt = false; 3659bool os::win32::_is_windows_2003 = false; 3660bool os::win32::_is_windows_server = false; 3661 3662// 6573254 3663// Currently, the bug is observed across all the supported Windows releases, 3664// including the latest one (as of this writing - Windows Server 2012 R2) 3665bool os::win32::_has_exit_bug = true; 3666bool os::win32::_has_performance_count = 0; 3667 3668void os::win32::initialize_system_info() { 3669 SYSTEM_INFO si; 3670 GetSystemInfo(&si); 3671 _vm_page_size = si.dwPageSize; 3672 _vm_allocation_granularity = si.dwAllocationGranularity; 3673 _processor_type = si.dwProcessorType; 3674 _processor_level = si.wProcessorLevel; 3675 set_processor_count(si.dwNumberOfProcessors); 3676 3677 MEMORYSTATUSEX ms; 3678 ms.dwLength = sizeof(ms); 3679 3680 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3681 // dwMemoryLoad (% of memory in use) 3682 GlobalMemoryStatusEx(&ms); 3683 _physical_memory = ms.ullTotalPhys; 3684 3685 OSVERSIONINFOEX oi; 3686 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 3687 GetVersionEx((OSVERSIONINFO*)&oi); 3688 switch (oi.dwPlatformId) { 3689 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 3690 case VER_PLATFORM_WIN32_NT: 3691 _is_nt = true; 3692 { 3693 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3694 if (os_vers == 5002) { 3695 _is_windows_2003 = true; 3696 } 3697 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER || 3698 oi.wProductType == VER_NT_SERVER) { 3699 _is_windows_server = true; 3700 } 3701 } 3702 break; 3703 default: fatal("Unknown platform"); 3704 } 3705 3706 _default_stack_size = os::current_stack_size(); 3707 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3708 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3709 "stack size not a multiple of page size"); 3710 3711 initialize_performance_counter(); 3712 3713 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is 3714 // known to deadlock the system, if the VM issues to thread operations with 3715 // a too high frequency, e.g., such as changing the priorities. 3716 // The 6000 seems to work well - no deadlocks has been notices on the test 3717 // programs that we have seen experience this problem. 3718 if (!os::win32::is_nt()) { 3719 StarvationMonitorInterval = 6000; 3720 } 3721} 3722 3723 3724HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, 3725 int ebuflen) { 3726 char path[MAX_PATH]; 3727 DWORD size; 3728 DWORD pathLen = (DWORD)sizeof(path); 3729 HINSTANCE result = NULL; 3730 3731 // only allow library name without path component 3732 assert(strchr(name, '\\') == NULL, "path not allowed"); 3733 assert(strchr(name, ':') == NULL, "path not allowed"); 3734 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) { 3735 jio_snprintf(ebuf, ebuflen, 3736 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name); 3737 return NULL; 3738 } 3739 3740 // search system directory 3741 if ((size = GetSystemDirectory(path, pathLen)) > 0) { 3742 if (size >= pathLen) { 3743 return NULL; // truncated 3744 } 3745 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3746 return NULL; // truncated 3747 } 3748 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3749 return result; 3750 } 3751 } 3752 3753 // try Windows directory 3754 if ((size = GetWindowsDirectory(path, pathLen)) > 0) { 3755 if (size >= pathLen) { 3756 return NULL; // truncated 3757 } 3758 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3759 return NULL; // truncated 3760 } 3761 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3762 return result; 3763 } 3764 } 3765 3766 jio_snprintf(ebuf, ebuflen, 3767 "os::win32::load_windows_dll() cannot load %s from system directories.", name); 3768 return NULL; 3769} 3770 3771#define MAX_EXIT_HANDLES PRODUCT_ONLY(32) NOT_PRODUCT(128) 3772#define EXIT_TIMEOUT PRODUCT_ONLY(1000) NOT_PRODUCT(4000) /* 1 sec in product, 4 sec in debug */ 3773 3774static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) { 3775 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect); 3776 return TRUE; 3777} 3778 3779int os::win32::exit_process_or_thread(Ept what, int exit_code) { 3780 // Basic approach: 3781 // - Each exiting thread registers its intent to exit and then does so. 3782 // - A thread trying to terminate the process must wait for all 3783 // threads currently exiting to complete their exit. 3784 3785 if (os::win32::has_exit_bug()) { 3786 // The array holds handles of the threads that have started exiting by calling 3787 // _endthreadex(). 3788 // Should be large enough to avoid blocking the exiting thread due to lack of 3789 // a free slot. 3790 static HANDLE handles[MAX_EXIT_HANDLES]; 3791 static int handle_count = 0; 3792 3793 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT; 3794 static CRITICAL_SECTION crit_sect; 3795 int i, j; 3796 DWORD res; 3797 HANDLE hproc, hthr; 3798 3799 // The first thread that reached this point, initializes the critical section. 3800 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) { 3801 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__); 3802 } else { 3803 EnterCriticalSection(&crit_sect); 3804 3805 if (what == EPT_THREAD) { 3806 // Remove from the array those handles of the threads that have completed exiting. 3807 for (i = 0, j = 0; i < handle_count; ++i) { 3808 res = WaitForSingleObject(handles[i], 0 /* don't wait */); 3809 if (res == WAIT_TIMEOUT) { 3810 handles[j++] = handles[i]; 3811 } else { 3812 if (res != WAIT_OBJECT_0) { 3813 warning("WaitForSingleObject failed in %s: %d\n", __FILE__, __LINE__); 3814 // Don't keep the handle, if we failed waiting for it. 3815 } 3816 CloseHandle(handles[i]); 3817 } 3818 } 3819 3820 // If there's no free slot in the array of the kept handles, we'll have to 3821 // wait until at least one thread completes exiting. 3822 if ((handle_count = j) == MAX_EXIT_HANDLES) { 3823 // Raise the priority of the oldest exiting thread to increase its chances 3824 // to complete sooner. 3825 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL); 3826 res = WaitForMultipleObjects(MAX_EXIT_HANDLES, handles, FALSE, EXIT_TIMEOUT); 3827 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAX_EXIT_HANDLES)) { 3828 i = (res - WAIT_OBJECT_0); 3829 handle_count = MAX_EXIT_HANDLES - 1; 3830 for (; i < handle_count; ++i) { 3831 handles[i] = handles[i + 1]; 3832 } 3833 } else { 3834 warning("WaitForMultipleObjects %s in %s: %d\n", 3835 (res == WAIT_FAILED ? "failed" : "timed out"), __FILE__, __LINE__); 3836 // Don't keep handles, if we failed waiting for them. 3837 for (i = 0; i < MAX_EXIT_HANDLES; ++i) { 3838 CloseHandle(handles[i]); 3839 } 3840 handle_count = 0; 3841 } 3842 } 3843 3844 // Store a duplicate of the current thread handle in the array of handles. 3845 hproc = GetCurrentProcess(); 3846 hthr = GetCurrentThread(); 3847 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count], 3848 0, FALSE, DUPLICATE_SAME_ACCESS)) { 3849 warning("DuplicateHandle failed in %s: %d\n", __FILE__, __LINE__); 3850 } else { 3851 ++handle_count; 3852 } 3853 3854 // The current exiting thread has stored its handle in the array, and now 3855 // should leave the critical section before calling _endthreadex(). 3856 3857 } else { // what != EPT_THREAD 3858 if (handle_count > 0) { 3859 // Before ending the process, make sure all the threads that had called 3860 // _endthreadex() completed. 3861 3862 // Set the priority level of the current thread to the same value as 3863 // the priority level of exiting threads. 3864 // This is to ensure it will be given a fair chance to execute if 3865 // the timeout expires. 3866 hthr = GetCurrentThread(); 3867 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL); 3868 for (i = 0; i < handle_count; ++i) { 3869 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL); 3870 } 3871 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT); 3872 if (res < WAIT_OBJECT_0 || res >= (WAIT_OBJECT_0 + MAX_EXIT_HANDLES)) { 3873 warning("WaitForMultipleObjects %s in %s: %d\n", 3874 (res == WAIT_FAILED ? "failed" : "timed out"), __FILE__, __LINE__); 3875 } 3876 for (i = 0; i < handle_count; ++i) { 3877 CloseHandle(handles[i]); 3878 } 3879 handle_count = 0; 3880 } 3881 3882 // End the process, not leaving critical section. 3883 // This makes sure no other thread executes exit-related code at the same 3884 // time, thus a race is avoided. 3885 if (what == EPT_PROCESS) { 3886 ::exit(exit_code); 3887 } else { 3888 _exit(exit_code); 3889 } 3890 } 3891 3892 LeaveCriticalSection(&crit_sect); 3893 } 3894 } 3895 3896 // We are here if either 3897 // - there's no 'race at exit' bug on this OS release; 3898 // - initialization of the critical section failed (unlikely); 3899 // - the current thread has stored its handle and left the critical section. 3900 if (what == EPT_THREAD) { 3901 _endthreadex((unsigned)exit_code); 3902 } else if (what == EPT_PROCESS) { 3903 ::exit(exit_code); 3904 } else { 3905 _exit(exit_code); 3906 } 3907 3908 // Should not reach here 3909 return exit_code; 3910} 3911 3912#undef MAX_EXIT_HANDLES 3913#undef EXIT_TIMEOUT 3914 3915void os::win32::setmode_streams() { 3916 _setmode(_fileno(stdin), _O_BINARY); 3917 _setmode(_fileno(stdout), _O_BINARY); 3918 _setmode(_fileno(stderr), _O_BINARY); 3919} 3920 3921 3922bool os::is_debugger_attached() { 3923 return IsDebuggerPresent() ? true : false; 3924} 3925 3926 3927void os::wait_for_keypress_at_exit(void) { 3928 if (PauseAtExit) { 3929 fprintf(stderr, "Press any key to continue...\n"); 3930 fgetc(stdin); 3931 } 3932} 3933 3934 3935int os::message_box(const char* title, const char* message) { 3936 int result = MessageBox(NULL, message, title, 3937 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 3938 return result == IDYES; 3939} 3940 3941int os::allocate_thread_local_storage() { 3942 return TlsAlloc(); 3943} 3944 3945 3946void os::free_thread_local_storage(int index) { 3947 TlsFree(index); 3948} 3949 3950 3951void os::thread_local_storage_at_put(int index, void* value) { 3952 TlsSetValue(index, value); 3953 assert(thread_local_storage_at(index) == value, "Just checking"); 3954} 3955 3956 3957void* os::thread_local_storage_at(int index) { 3958 return TlsGetValue(index); 3959} 3960 3961 3962#ifndef PRODUCT 3963#ifndef _WIN64 3964// Helpers to check whether NX protection is enabled 3965int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 3966 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 3967 pex->ExceptionRecord->NumberParameters > 0 && 3968 pex->ExceptionRecord->ExceptionInformation[0] == 3969 EXCEPTION_INFO_EXEC_VIOLATION) { 3970 return EXCEPTION_EXECUTE_HANDLER; 3971 } 3972 return EXCEPTION_CONTINUE_SEARCH; 3973} 3974 3975void nx_check_protection() { 3976 // If NX is enabled we'll get an exception calling into code on the stack 3977 char code[] = { (char)0xC3 }; // ret 3978 void *code_ptr = (void *)code; 3979 __try { 3980 __asm call code_ptr 3981 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 3982 tty->print_raw_cr("NX protection detected."); 3983 } 3984} 3985#endif // _WIN64 3986#endif // PRODUCT 3987 3988// this is called _before_ the global arguments have been parsed 3989void os::init(void) { 3990 _initial_pid = _getpid(); 3991 3992 init_random(1234567); 3993 3994 win32::initialize_system_info(); 3995 win32::setmode_streams(); 3996 init_page_sizes((size_t) win32::vm_page_size()); 3997 3998 // This may be overridden later when argument processing is done. 3999 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, 4000 os::win32::is_windows_2003()); 4001 4002 // Initialize main_process and main_thread 4003 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 4004 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 4005 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 4006 fatal("DuplicateHandle failed\n"); 4007 } 4008 main_thread_id = (int) GetCurrentThreadId(); 4009} 4010 4011// To install functions for atexit processing 4012extern "C" { 4013 static void perfMemory_exit_helper() { 4014 perfMemory_exit(); 4015 } 4016} 4017 4018static jint initSock(); 4019 4020// this is called _after_ the global arguments have been parsed 4021jint os::init_2(void) { 4022 // Allocate a single page and mark it as readable for safepoint polling 4023 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 4024 guarantee(polling_page != NULL, "Reserve Failed for polling page"); 4025 4026 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 4027 guarantee(return_page != NULL, "Commit Failed for polling page"); 4028 4029 os::set_polling_page(polling_page); 4030 4031#ifndef PRODUCT 4032 if (Verbose && PrintMiscellaneous) { 4033 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", 4034 (intptr_t)polling_page); 4035 } 4036#endif 4037 4038 if (!UseMembar) { 4039 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE); 4040 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 4041 4042 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE); 4043 guarantee(return_page != NULL, "Commit Failed for memory serialize page"); 4044 4045 os::set_memory_serialize_page(mem_serialize_page); 4046 4047#ifndef PRODUCT 4048 if (Verbose && PrintMiscellaneous) { 4049 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", 4050 (intptr_t)mem_serialize_page); 4051 } 4052#endif 4053 } 4054 4055 // Setup Windows Exceptions 4056 4057 // for debugging float code generation bugs 4058 if (ForceFloatExceptions) { 4059#ifndef _WIN64 4060 static long fp_control_word = 0; 4061 __asm { fstcw fp_control_word } 4062 // see Intel PPro Manual, Vol. 2, p 7-16 4063 const long precision = 0x20; 4064 const long underflow = 0x10; 4065 const long overflow = 0x08; 4066 const long zero_div = 0x04; 4067 const long denorm = 0x02; 4068 const long invalid = 0x01; 4069 fp_control_word |= invalid; 4070 __asm { fldcw fp_control_word } 4071#endif 4072 } 4073 4074 // If stack_commit_size is 0, windows will reserve the default size, 4075 // but only commit a small portion of it. 4076 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 4077 size_t default_reserve_size = os::win32::default_stack_size(); 4078 size_t actual_reserve_size = stack_commit_size; 4079 if (stack_commit_size < default_reserve_size) { 4080 // If stack_commit_size == 0, we want this too 4081 actual_reserve_size = default_reserve_size; 4082 } 4083 4084 // Check minimum allowable stack size for thread creation and to initialize 4085 // the java system classes, including StackOverflowError - depends on page 4086 // size. Add a page for compiler2 recursion in main thread. 4087 // Add in 2*BytesPerWord times page size to account for VM stack during 4088 // class initialization depending on 32 or 64 bit VM. 4089 size_t min_stack_allowed = 4090 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 4091 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size(); 4092 if (actual_reserve_size < min_stack_allowed) { 4093 tty->print_cr("\nThe stack size specified is too small, " 4094 "Specify at least %dk", 4095 min_stack_allowed / K); 4096 return JNI_ERR; 4097 } 4098 4099 JavaThread::set_stack_size_at_create(stack_commit_size); 4100 4101 // Calculate theoretical max. size of Threads to guard gainst artifical 4102 // out-of-memory situations, where all available address-space has been 4103 // reserved by thread stacks. 4104 assert(actual_reserve_size != 0, "Must have a stack"); 4105 4106 // Calculate the thread limit when we should start doing Virtual Memory 4107 // banging. Currently when the threads will have used all but 200Mb of space. 4108 // 4109 // TODO: consider performing a similar calculation for commit size instead 4110 // as reserve size, since on a 64-bit platform we'll run into that more 4111 // often than running out of virtual memory space. We can use the 4112 // lower value of the two calculations as the os_thread_limit. 4113 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 4114 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 4115 4116 // at exit methods are called in the reverse order of their registration. 4117 // there is no limit to the number of functions registered. atexit does 4118 // not set errno. 4119 4120 if (PerfAllowAtExitRegistration) { 4121 // only register atexit functions if PerfAllowAtExitRegistration is set. 4122 // atexit functions can be delayed until process exit time, which 4123 // can be problematic for embedded VM situations. Embedded VMs should 4124 // call DestroyJavaVM() to assure that VM resources are released. 4125 4126 // note: perfMemory_exit_helper atexit function may be removed in 4127 // the future if the appropriate cleanup code can be added to the 4128 // VM_Exit VMOperation's doit method. 4129 if (atexit(perfMemory_exit_helper) != 0) { 4130 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 4131 } 4132 } 4133 4134#ifndef _WIN64 4135 // Print something if NX is enabled (win32 on AMD64) 4136 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 4137#endif 4138 4139 // initialize thread priority policy 4140 prio_init(); 4141 4142 if (UseNUMA && !ForceNUMA) { 4143 UseNUMA = false; // We don't fully support this yet 4144 } 4145 4146 if (UseNUMAInterleaving) { 4147 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag 4148 bool success = numa_interleaving_init(); 4149 if (!success) UseNUMAInterleaving = false; 4150 } 4151 4152 if (initSock() != JNI_OK) { 4153 return JNI_ERR; 4154 } 4155 4156 return JNI_OK; 4157} 4158 4159// Mark the polling page as unreadable 4160void os::make_polling_page_unreadable(void) { 4161 DWORD old_status; 4162 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4163 PAGE_NOACCESS, &old_status)) { 4164 fatal("Could not disable polling page"); 4165 } 4166} 4167 4168// Mark the polling page as readable 4169void os::make_polling_page_readable(void) { 4170 DWORD old_status; 4171 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4172 PAGE_READONLY, &old_status)) { 4173 fatal("Could not enable polling page"); 4174 } 4175} 4176 4177 4178int os::stat(const char *path, struct stat *sbuf) { 4179 char pathbuf[MAX_PATH]; 4180 if (strlen(path) > MAX_PATH - 1) { 4181 errno = ENAMETOOLONG; 4182 return -1; 4183 } 4184 os::native_path(strcpy(pathbuf, path)); 4185 int ret = ::stat(pathbuf, sbuf); 4186 if (sbuf != NULL && UseUTCFileTimestamp) { 4187 // Fix for 6539723. st_mtime returned from stat() is dependent on 4188 // the system timezone and so can return different values for the 4189 // same file if/when daylight savings time changes. This adjustment 4190 // makes sure the same timestamp is returned regardless of the TZ. 4191 // 4192 // See: 4193 // http://msdn.microsoft.com/library/ 4194 // default.asp?url=/library/en-us/sysinfo/base/ 4195 // time_zone_information_str.asp 4196 // and 4197 // http://msdn.microsoft.com/library/default.asp?url= 4198 // /library/en-us/sysinfo/base/settimezoneinformation.asp 4199 // 4200 // NOTE: there is a insidious bug here: If the timezone is changed 4201 // after the call to stat() but before 'GetTimeZoneInformation()', then 4202 // the adjustment we do here will be wrong and we'll return the wrong 4203 // value (which will likely end up creating an invalid class data 4204 // archive). Absent a better API for this, or some time zone locking 4205 // mechanism, we'll have to live with this risk. 4206 TIME_ZONE_INFORMATION tz; 4207 DWORD tzid = GetTimeZoneInformation(&tz); 4208 int daylightBias = 4209 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 4210 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 4211 } 4212 return ret; 4213} 4214 4215 4216#define FT2INT64(ft) \ 4217 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 4218 4219 4220// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4221// are used by JVM M&M and JVMTI to get user+sys or user CPU time 4222// of a thread. 4223// 4224// current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4225// the fast estimate available on the platform. 4226 4227// current_thread_cpu_time() is not optimized for Windows yet 4228jlong os::current_thread_cpu_time() { 4229 // return user + sys since the cost is the same 4230 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 4231} 4232 4233jlong os::thread_cpu_time(Thread* thread) { 4234 // consistent with what current_thread_cpu_time() returns. 4235 return os::thread_cpu_time(thread, true /* user+sys */); 4236} 4237 4238jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4239 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4240} 4241 4242jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 4243 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 4244 // If this function changes, os::is_thread_cpu_time_supported() should too 4245 if (os::win32::is_nt()) { 4246 FILETIME CreationTime; 4247 FILETIME ExitTime; 4248 FILETIME KernelTime; 4249 FILETIME UserTime; 4250 4251 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime, 4252 &ExitTime, &KernelTime, &UserTime) == 0) { 4253 return -1; 4254 } else if (user_sys_cpu_time) { 4255 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 4256 } else { 4257 return FT2INT64(UserTime) * 100; 4258 } 4259 } else { 4260 return (jlong) timeGetTime() * 1000000; 4261 } 4262} 4263 4264void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4265 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4266 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4267 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4268 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4269} 4270 4271void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4272 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4273 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4274 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4275 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4276} 4277 4278bool os::is_thread_cpu_time_supported() { 4279 // see os::thread_cpu_time 4280 if (os::win32::is_nt()) { 4281 FILETIME CreationTime; 4282 FILETIME ExitTime; 4283 FILETIME KernelTime; 4284 FILETIME UserTime; 4285 4286 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime, 4287 &KernelTime, &UserTime) == 0) { 4288 return false; 4289 } else { 4290 return true; 4291 } 4292 } else { 4293 return false; 4294 } 4295} 4296 4297// Windows does't provide a loadavg primitive so this is stubbed out for now. 4298// It does have primitives (PDH API) to get CPU usage and run queue length. 4299// "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 4300// If we wanted to implement loadavg on Windows, we have a few options: 4301// 4302// a) Query CPU usage and run queue length and "fake" an answer by 4303// returning the CPU usage if it's under 100%, and the run queue 4304// length otherwise. It turns out that querying is pretty slow 4305// on Windows, on the order of 200 microseconds on a fast machine. 4306// Note that on the Windows the CPU usage value is the % usage 4307// since the last time the API was called (and the first call 4308// returns 100%), so we'd have to deal with that as well. 4309// 4310// b) Sample the "fake" answer using a sampling thread and store 4311// the answer in a global variable. The call to loadavg would 4312// just return the value of the global, avoiding the slow query. 4313// 4314// c) Sample a better answer using exponential decay to smooth the 4315// value. This is basically the algorithm used by UNIX kernels. 4316// 4317// Note that sampling thread starvation could affect both (b) and (c). 4318int os::loadavg(double loadavg[], int nelem) { 4319 return -1; 4320} 4321 4322 4323// DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 4324bool os::dont_yield() { 4325 return DontYieldALot; 4326} 4327 4328// This method is a slightly reworked copy of JDK's sysOpen 4329// from src/windows/hpi/src/sys_api_md.c 4330 4331int os::open(const char *path, int oflag, int mode) { 4332 char pathbuf[MAX_PATH]; 4333 4334 if (strlen(path) > MAX_PATH - 1) { 4335 errno = ENAMETOOLONG; 4336 return -1; 4337 } 4338 os::native_path(strcpy(pathbuf, path)); 4339 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 4340} 4341 4342FILE* os::open(int fd, const char* mode) { 4343 return ::_fdopen(fd, mode); 4344} 4345 4346// Is a (classpath) directory empty? 4347bool os::dir_is_empty(const char* path) { 4348 WIN32_FIND_DATA fd; 4349 HANDLE f = FindFirstFile(path, &fd); 4350 if (f == INVALID_HANDLE_VALUE) { 4351 return true; 4352 } 4353 FindClose(f); 4354 return false; 4355} 4356 4357// create binary file, rewriting existing file if required 4358int os::create_binary_file(const char* path, bool rewrite_existing) { 4359 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 4360 if (!rewrite_existing) { 4361 oflags |= _O_EXCL; 4362 } 4363 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 4364} 4365 4366// return current position of file pointer 4367jlong os::current_file_offset(int fd) { 4368 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 4369} 4370 4371// move file pointer to the specified offset 4372jlong os::seek_to_file_offset(int fd, jlong offset) { 4373 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 4374} 4375 4376 4377jlong os::lseek(int fd, jlong offset, int whence) { 4378 return (jlong) ::_lseeki64(fd, offset, whence); 4379} 4380 4381size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 4382 OVERLAPPED ov; 4383 DWORD nread; 4384 BOOL result; 4385 4386 ZeroMemory(&ov, sizeof(ov)); 4387 ov.Offset = (DWORD)offset; 4388 ov.OffsetHigh = (DWORD)(offset >> 32); 4389 4390 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4391 4392 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov); 4393 4394 return result ? nread : 0; 4395} 4396 4397 4398// This method is a slightly reworked copy of JDK's sysNativePath 4399// from src/windows/hpi/src/path_md.c 4400 4401// Convert a pathname to native format. On win32, this involves forcing all 4402// separators to be '\\' rather than '/' (both are legal inputs, but Win95 4403// sometimes rejects '/') and removing redundant separators. The input path is 4404// assumed to have been converted into the character encoding used by the local 4405// system. Because this might be a double-byte encoding, care is taken to 4406// treat double-byte lead characters correctly. 4407// 4408// This procedure modifies the given path in place, as the result is never 4409// longer than the original. There is no error return; this operation always 4410// succeeds. 4411char * os::native_path(char *path) { 4412 char *src = path, *dst = path, *end = path; 4413 char *colon = NULL; // If a drive specifier is found, this will 4414 // point to the colon following the drive letter 4415 4416 // Assumption: '/', '\\', ':', and drive letters are never lead bytes 4417 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\')) 4418 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte"); 4419 4420 // Check for leading separators 4421#define isfilesep(c) ((c) == '/' || (c) == '\\') 4422 while (isfilesep(*src)) { 4423 src++; 4424 } 4425 4426 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 4427 // Remove leading separators if followed by drive specifier. This 4428 // hack is necessary to support file URLs containing drive 4429 // specifiers (e.g., "file://c:/path"). As a side effect, 4430 // "/c:/path" can be used as an alternative to "c:/path". 4431 *dst++ = *src++; 4432 colon = dst; 4433 *dst++ = ':'; 4434 src++; 4435 } else { 4436 src = path; 4437 if (isfilesep(src[0]) && isfilesep(src[1])) { 4438 // UNC pathname: Retain first separator; leave src pointed at 4439 // second separator so that further separators will be collapsed 4440 // into the second separator. The result will be a pathname 4441 // beginning with "\\\\" followed (most likely) by a host name. 4442 src = dst = path + 1; 4443 path[0] = '\\'; // Force first separator to '\\' 4444 } 4445 } 4446 4447 end = dst; 4448 4449 // Remove redundant separators from remainder of path, forcing all 4450 // separators to be '\\' rather than '/'. Also, single byte space 4451 // characters are removed from the end of the path because those 4452 // are not legal ending characters on this operating system. 4453 // 4454 while (*src != '\0') { 4455 if (isfilesep(*src)) { 4456 *dst++ = '\\'; src++; 4457 while (isfilesep(*src)) src++; 4458 if (*src == '\0') { 4459 // Check for trailing separator 4460 end = dst; 4461 if (colon == dst - 2) break; // "z:\\" 4462 if (dst == path + 1) break; // "\\" 4463 if (dst == path + 2 && isfilesep(path[0])) { 4464 // "\\\\" is not collapsed to "\\" because "\\\\" marks the 4465 // beginning of a UNC pathname. Even though it is not, by 4466 // itself, a valid UNC pathname, we leave it as is in order 4467 // to be consistent with the path canonicalizer as well 4468 // as the win32 APIs, which treat this case as an invalid 4469 // UNC pathname rather than as an alias for the root 4470 // directory of the current drive. 4471 break; 4472 } 4473 end = --dst; // Path does not denote a root directory, so 4474 // remove trailing separator 4475 break; 4476 } 4477 end = dst; 4478 } else { 4479 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character 4480 *dst++ = *src++; 4481 if (*src) *dst++ = *src++; 4482 end = dst; 4483 } else { // Copy a single-byte character 4484 char c = *src++; 4485 *dst++ = c; 4486 // Space is not a legal ending character 4487 if (c != ' ') end = dst; 4488 } 4489 } 4490 } 4491 4492 *end = '\0'; 4493 4494 // For "z:", add "." to work around a bug in the C runtime library 4495 if (colon == dst - 1) { 4496 path[2] = '.'; 4497 path[3] = '\0'; 4498 } 4499 4500 return path; 4501} 4502 4503// This code is a copy of JDK's sysSetLength 4504// from src/windows/hpi/src/sys_api_md.c 4505 4506int os::ftruncate(int fd, jlong length) { 4507 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4508 long high = (long)(length >> 32); 4509 DWORD ret; 4510 4511 if (h == (HANDLE)(-1)) { 4512 return -1; 4513 } 4514 4515 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 4516 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 4517 return -1; 4518 } 4519 4520 if (::SetEndOfFile(h) == FALSE) { 4521 return -1; 4522 } 4523 4524 return 0; 4525} 4526 4527 4528// This code is a copy of JDK's sysSync 4529// from src/windows/hpi/src/sys_api_md.c 4530// except for the legacy workaround for a bug in Win 98 4531 4532int os::fsync(int fd) { 4533 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 4534 4535 if ((!::FlushFileBuffers(handle)) && 4536 (GetLastError() != ERROR_ACCESS_DENIED)) { 4537 // from winerror.h 4538 return -1; 4539 } 4540 return 0; 4541} 4542 4543static int nonSeekAvailable(int, long *); 4544static int stdinAvailable(int, long *); 4545 4546#define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR) 4547#define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO) 4548 4549// This code is a copy of JDK's sysAvailable 4550// from src/windows/hpi/src/sys_api_md.c 4551 4552int os::available(int fd, jlong *bytes) { 4553 jlong cur, end; 4554 struct _stati64 stbuf64; 4555 4556 if (::_fstati64(fd, &stbuf64) >= 0) { 4557 int mode = stbuf64.st_mode; 4558 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 4559 int ret; 4560 long lpbytes; 4561 if (fd == 0) { 4562 ret = stdinAvailable(fd, &lpbytes); 4563 } else { 4564 ret = nonSeekAvailable(fd, &lpbytes); 4565 } 4566 (*bytes) = (jlong)(lpbytes); 4567 return ret; 4568 } 4569 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 4570 return FALSE; 4571 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 4572 return FALSE; 4573 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 4574 return FALSE; 4575 } 4576 *bytes = end - cur; 4577 return TRUE; 4578 } else { 4579 return FALSE; 4580 } 4581} 4582 4583// This code is a copy of JDK's nonSeekAvailable 4584// from src/windows/hpi/src/sys_api_md.c 4585 4586static int nonSeekAvailable(int fd, long *pbytes) { 4587 // This is used for available on non-seekable devices 4588 // (like both named and anonymous pipes, such as pipes 4589 // connected to an exec'd process). 4590 // Standard Input is a special case. 4591 HANDLE han; 4592 4593 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 4594 return FALSE; 4595 } 4596 4597 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 4598 // PeekNamedPipe fails when at EOF. In that case we 4599 // simply make *pbytes = 0 which is consistent with the 4600 // behavior we get on Solaris when an fd is at EOF. 4601 // The only alternative is to raise an Exception, 4602 // which isn't really warranted. 4603 // 4604 if (::GetLastError() != ERROR_BROKEN_PIPE) { 4605 return FALSE; 4606 } 4607 *pbytes = 0; 4608 } 4609 return TRUE; 4610} 4611 4612#define MAX_INPUT_EVENTS 2000 4613 4614// This code is a copy of JDK's stdinAvailable 4615// from src/windows/hpi/src/sys_api_md.c 4616 4617static int stdinAvailable(int fd, long *pbytes) { 4618 HANDLE han; 4619 DWORD numEventsRead = 0; // Number of events read from buffer 4620 DWORD numEvents = 0; // Number of events in buffer 4621 DWORD i = 0; // Loop index 4622 DWORD curLength = 0; // Position marker 4623 DWORD actualLength = 0; // Number of bytes readable 4624 BOOL error = FALSE; // Error holder 4625 INPUT_RECORD *lpBuffer; // Pointer to records of input events 4626 4627 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4628 return FALSE; 4629 } 4630 4631 // Construct an array of input records in the console buffer 4632 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4633 if (error == 0) { 4634 return nonSeekAvailable(fd, pbytes); 4635 } 4636 4637 // lpBuffer must fit into 64K or else PeekConsoleInput fails 4638 if (numEvents > MAX_INPUT_EVENTS) { 4639 numEvents = MAX_INPUT_EVENTS; 4640 } 4641 4642 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal); 4643 if (lpBuffer == NULL) { 4644 return FALSE; 4645 } 4646 4647 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4648 if (error == 0) { 4649 os::free(lpBuffer); 4650 return FALSE; 4651 } 4652 4653 // Examine input records for the number of bytes available 4654 for (i=0; i<numEvents; i++) { 4655 if (lpBuffer[i].EventType == KEY_EVENT) { 4656 4657 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4658 &(lpBuffer[i].Event); 4659 if (keyRecord->bKeyDown == TRUE) { 4660 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4661 curLength++; 4662 if (*keyPressed == '\r') { 4663 actualLength = curLength; 4664 } 4665 } 4666 } 4667 } 4668 4669 if (lpBuffer != NULL) { 4670 os::free(lpBuffer); 4671 } 4672 4673 *pbytes = (long) actualLength; 4674 return TRUE; 4675} 4676 4677// Map a block of memory. 4678char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4679 char *addr, size_t bytes, bool read_only, 4680 bool allow_exec) { 4681 HANDLE hFile; 4682 char* base; 4683 4684 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4685 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4686 if (hFile == NULL) { 4687 if (PrintMiscellaneous && Verbose) { 4688 DWORD err = GetLastError(); 4689 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err); 4690 } 4691 return NULL; 4692 } 4693 4694 if (allow_exec) { 4695 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4696 // unless it comes from a PE image (which the shared archive is not.) 4697 // Even VirtualProtect refuses to give execute access to mapped memory 4698 // that was not previously executable. 4699 // 4700 // Instead, stick the executable region in anonymous memory. Yuck. 4701 // Penalty is that ~4 pages will not be shareable - in the future 4702 // we might consider DLLizing the shared archive with a proper PE 4703 // header so that mapping executable + sharing is possible. 4704 4705 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4706 PAGE_READWRITE); 4707 if (base == NULL) { 4708 if (PrintMiscellaneous && Verbose) { 4709 DWORD err = GetLastError(); 4710 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 4711 } 4712 CloseHandle(hFile); 4713 return NULL; 4714 } 4715 4716 DWORD bytes_read; 4717 OVERLAPPED overlapped; 4718 overlapped.Offset = (DWORD)file_offset; 4719 overlapped.OffsetHigh = 0; 4720 overlapped.hEvent = NULL; 4721 // ReadFile guarantees that if the return value is true, the requested 4722 // number of bytes were read before returning. 4723 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 4724 if (!res) { 4725 if (PrintMiscellaneous && Verbose) { 4726 DWORD err = GetLastError(); 4727 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 4728 } 4729 release_memory(base, bytes); 4730 CloseHandle(hFile); 4731 return NULL; 4732 } 4733 } else { 4734 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 4735 NULL /* file_name */); 4736 if (hMap == NULL) { 4737 if (PrintMiscellaneous && Verbose) { 4738 DWORD err = GetLastError(); 4739 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err); 4740 } 4741 CloseHandle(hFile); 4742 return NULL; 4743 } 4744 4745 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 4746 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 4747 (DWORD)bytes, addr); 4748 if (base == NULL) { 4749 if (PrintMiscellaneous && Verbose) { 4750 DWORD err = GetLastError(); 4751 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 4752 } 4753 CloseHandle(hMap); 4754 CloseHandle(hFile); 4755 return NULL; 4756 } 4757 4758 if (CloseHandle(hMap) == 0) { 4759 if (PrintMiscellaneous && Verbose) { 4760 DWORD err = GetLastError(); 4761 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 4762 } 4763 CloseHandle(hFile); 4764 return base; 4765 } 4766 } 4767 4768 if (allow_exec) { 4769 DWORD old_protect; 4770 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 4771 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 4772 4773 if (!res) { 4774 if (PrintMiscellaneous && Verbose) { 4775 DWORD err = GetLastError(); 4776 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 4777 } 4778 // Don't consider this a hard error, on IA32 even if the 4779 // VirtualProtect fails, we should still be able to execute 4780 CloseHandle(hFile); 4781 return base; 4782 } 4783 } 4784 4785 if (CloseHandle(hFile) == 0) { 4786 if (PrintMiscellaneous && Verbose) { 4787 DWORD err = GetLastError(); 4788 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 4789 } 4790 return base; 4791 } 4792 4793 return base; 4794} 4795 4796 4797// Remap a block of memory. 4798char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4799 char *addr, size_t bytes, bool read_only, 4800 bool allow_exec) { 4801 // This OS does not allow existing memory maps to be remapped so we 4802 // have to unmap the memory before we remap it. 4803 if (!os::unmap_memory(addr, bytes)) { 4804 return NULL; 4805 } 4806 4807 // There is a very small theoretical window between the unmap_memory() 4808 // call above and the map_memory() call below where a thread in native 4809 // code may be able to access an address that is no longer mapped. 4810 4811 return os::map_memory(fd, file_name, file_offset, addr, bytes, 4812 read_only, allow_exec); 4813} 4814 4815 4816// Unmap a block of memory. 4817// Returns true=success, otherwise false. 4818 4819bool os::pd_unmap_memory(char* addr, size_t bytes) { 4820 BOOL result = UnmapViewOfFile(addr); 4821 if (result == 0) { 4822 if (PrintMiscellaneous && Verbose) { 4823 DWORD err = GetLastError(); 4824 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 4825 } 4826 return false; 4827 } 4828 return true; 4829} 4830 4831void os::pause() { 4832 char filename[MAX_PATH]; 4833 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4834 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4835 } else { 4836 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4837 } 4838 4839 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4840 if (fd != -1) { 4841 struct stat buf; 4842 ::close(fd); 4843 while (::stat(filename, &buf) == 0) { 4844 Sleep(100); 4845 } 4846 } else { 4847 jio_fprintf(stderr, 4848 "Could not open pause file '%s', continuing immediately.\n", filename); 4849 } 4850} 4851 4852os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 4853 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 4854} 4855 4856// See the caveats for this class in os_windows.hpp 4857// Protects the callback call so that raised OS EXCEPTIONS causes a jump back 4858// into this method and returns false. If no OS EXCEPTION was raised, returns 4859// true. 4860// The callback is supposed to provide the method that should be protected. 4861// 4862bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 4863 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); 4864 assert(!WatcherThread::watcher_thread()->has_crash_protection(), 4865 "crash_protection already set?"); 4866 4867 bool success = true; 4868 __try { 4869 WatcherThread::watcher_thread()->set_crash_protection(this); 4870 cb.call(); 4871 } __except(EXCEPTION_EXECUTE_HANDLER) { 4872 // only for protection, nothing to do 4873 success = false; 4874 } 4875 WatcherThread::watcher_thread()->set_crash_protection(NULL); 4876 return success; 4877} 4878 4879// An Event wraps a win32 "CreateEvent" kernel handle. 4880// 4881// We have a number of choices regarding "CreateEvent" win32 handle leakage: 4882// 4883// 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 4884// field, and call CloseHandle() on the win32 event handle. Unpark() would 4885// need to be modified to tolerate finding a NULL (invalid) win32 event handle. 4886// In addition, an unpark() operation might fetch the handle field, but the 4887// event could recycle between the fetch and the SetEvent() operation. 4888// SetEvent() would either fail because the handle was invalid, or inadvertently work, 4889// as the win32 handle value had been recycled. In an ideal world calling SetEvent() 4890// on an stale but recycled handle would be harmless, but in practice this might 4891// confuse other non-Sun code, so it's not a viable approach. 4892// 4893// 2: Once a win32 event handle is associated with an Event, it remains associated 4894// with the Event. The event handle is never closed. This could be construed 4895// as handle leakage, but only up to the maximum # of threads that have been extant 4896// at any one time. This shouldn't be an issue, as windows platforms typically 4897// permit a process to have hundreds of thousands of open handles. 4898// 4899// 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 4900// and release unused handles. 4901// 4902// 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 4903// It's not clear, however, that we wouldn't be trading one type of leak for another. 4904// 4905// 5. Use an RCU-like mechanism (Read-Copy Update). 4906// Or perhaps something similar to Maged Michael's "Hazard pointers". 4907// 4908// We use (2). 4909// 4910// TODO-FIXME: 4911// 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 4912// 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 4913// to recover from (or at least detect) the dreaded Windows 841176 bug. 4914// 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 4915// into a single win32 CreateEvent() handle. 4916// 4917// Assumption: 4918// Only one parker can exist on an event, which is why we allocate 4919// them per-thread. Multiple unparkers can coexist. 4920// 4921// _Event transitions in park() 4922// -1 => -1 : illegal 4923// 1 => 0 : pass - return immediately 4924// 0 => -1 : block; then set _Event to 0 before returning 4925// 4926// _Event transitions in unpark() 4927// 0 => 1 : just return 4928// 1 => 1 : just return 4929// -1 => either 0 or 1; must signal target thread 4930// That is, we can safely transition _Event from -1 to either 4931// 0 or 1. 4932// 4933// _Event serves as a restricted-range semaphore. 4934// -1 : thread is blocked, i.e. there is a waiter 4935// 0 : neutral: thread is running or ready, 4936// could have been signaled after a wait started 4937// 1 : signaled - thread is running or ready 4938// 4939// Another possible encoding of _Event would be with 4940// explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 4941// 4942 4943int os::PlatformEvent::park(jlong Millis) { 4944 // Transitions for _Event: 4945 // -1 => -1 : illegal 4946 // 1 => 0 : pass - return immediately 4947 // 0 => -1 : block; then set _Event to 0 before returning 4948 4949 guarantee(_ParkHandle != NULL , "Invariant"); 4950 guarantee(Millis > 0 , "Invariant"); 4951 4952 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 4953 // the initial park() operation. 4954 // Consider: use atomic decrement instead of CAS-loop 4955 4956 int v; 4957 for (;;) { 4958 v = _Event; 4959 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4960 } 4961 guarantee((v == 0) || (v == 1), "invariant"); 4962 if (v != 0) return OS_OK; 4963 4964 // Do this the hard way by blocking ... 4965 // TODO: consider a brief spin here, gated on the success of recent 4966 // spin attempts by this thread. 4967 // 4968 // We decompose long timeouts into series of shorter timed waits. 4969 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 4970 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 4971 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 4972 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 4973 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 4974 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 4975 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 4976 // for the already waited time. This policy does not admit any new outcomes. 4977 // In the future, however, we might want to track the accumulated wait time and 4978 // adjust Millis accordingly if we encounter a spurious wakeup. 4979 4980 const int MAXTIMEOUT = 0x10000000; 4981 DWORD rv = WAIT_TIMEOUT; 4982 while (_Event < 0 && Millis > 0) { 4983 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT) 4984 if (Millis > MAXTIMEOUT) { 4985 prd = MAXTIMEOUT; 4986 } 4987 rv = ::WaitForSingleObject(_ParkHandle, prd); 4988 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed"); 4989 if (rv == WAIT_TIMEOUT) { 4990 Millis -= prd; 4991 } 4992 } 4993 v = _Event; 4994 _Event = 0; 4995 // see comment at end of os::PlatformEvent::park() below: 4996 OrderAccess::fence(); 4997 // If we encounter a nearly simultanous timeout expiry and unpark() 4998 // we return OS_OK indicating we awoke via unpark(). 4999 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 5000 return (v >= 0) ? OS_OK : OS_TIMEOUT; 5001} 5002 5003void os::PlatformEvent::park() { 5004 // Transitions for _Event: 5005 // -1 => -1 : illegal 5006 // 1 => 0 : pass - return immediately 5007 // 0 => -1 : block; then set _Event to 0 before returning 5008 5009 guarantee(_ParkHandle != NULL, "Invariant"); 5010 // Invariant: Only the thread associated with the Event/PlatformEvent 5011 // may call park(). 5012 // Consider: use atomic decrement instead of CAS-loop 5013 int v; 5014 for (;;) { 5015 v = _Event; 5016 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5017 } 5018 guarantee((v == 0) || (v == 1), "invariant"); 5019 if (v != 0) return; 5020 5021 // Do this the hard way by blocking ... 5022 // TODO: consider a brief spin here, gated on the success of recent 5023 // spin attempts by this thread. 5024 while (_Event < 0) { 5025 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE); 5026 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed"); 5027 } 5028 5029 // Usually we'll find _Event == 0 at this point, but as 5030 // an optional optimization we clear it, just in case can 5031 // multiple unpark() operations drove _Event up to 1. 5032 _Event = 0; 5033 OrderAccess::fence(); 5034 guarantee(_Event >= 0, "invariant"); 5035} 5036 5037void os::PlatformEvent::unpark() { 5038 guarantee(_ParkHandle != NULL, "Invariant"); 5039 5040 // Transitions for _Event: 5041 // 0 => 1 : just return 5042 // 1 => 1 : just return 5043 // -1 => either 0 or 1; must signal target thread 5044 // That is, we can safely transition _Event from -1 to either 5045 // 0 or 1. 5046 // See also: "Semaphores in Plan 9" by Mullender & Cox 5047 // 5048 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5049 // that it will take two back-to-back park() calls for the owning 5050 // thread to block. This has the benefit of forcing a spurious return 5051 // from the first park() call after an unpark() call which will help 5052 // shake out uses of park() and unpark() without condition variables. 5053 5054 if (Atomic::xchg(1, &_Event) >= 0) return; 5055 5056 ::SetEvent(_ParkHandle); 5057} 5058 5059 5060// JSR166 5061// ------------------------------------------------------- 5062 5063// The Windows implementation of Park is very straightforward: Basic 5064// operations on Win32 Events turn out to have the right semantics to 5065// use them directly. We opportunistically resuse the event inherited 5066// from Monitor. 5067 5068void Parker::park(bool isAbsolute, jlong time) { 5069 guarantee(_ParkEvent != NULL, "invariant"); 5070 // First, demultiplex/decode time arguments 5071 if (time < 0) { // don't wait 5072 return; 5073 } else if (time == 0 && !isAbsolute) { 5074 time = INFINITE; 5075 } else if (isAbsolute) { 5076 time -= os::javaTimeMillis(); // convert to relative time 5077 if (time <= 0) { // already elapsed 5078 return; 5079 } 5080 } else { // relative 5081 time /= 1000000; // Must coarsen from nanos to millis 5082 if (time == 0) { // Wait for the minimal time unit if zero 5083 time = 1; 5084 } 5085 } 5086 5087 JavaThread* thread = (JavaThread*)(Thread::current()); 5088 assert(thread->is_Java_thread(), "Must be JavaThread"); 5089 JavaThread *jt = (JavaThread *)thread; 5090 5091 // Don't wait if interrupted or already triggered 5092 if (Thread::is_interrupted(thread, false) || 5093 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 5094 ResetEvent(_ParkEvent); 5095 return; 5096 } else { 5097 ThreadBlockInVM tbivm(jt); 5098 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5099 jt->set_suspend_equivalent(); 5100 5101 WaitForSingleObject(_ParkEvent, time); 5102 ResetEvent(_ParkEvent); 5103 5104 // If externally suspended while waiting, re-suspend 5105 if (jt->handle_special_suspend_equivalent_condition()) { 5106 jt->java_suspend_self(); 5107 } 5108 } 5109} 5110 5111void Parker::unpark() { 5112 guarantee(_ParkEvent != NULL, "invariant"); 5113 SetEvent(_ParkEvent); 5114} 5115 5116// Run the specified command in a separate process. Return its exit value, 5117// or -1 on failure (e.g. can't create a new process). 5118int os::fork_and_exec(char* cmd) { 5119 STARTUPINFO si; 5120 PROCESS_INFORMATION pi; 5121 5122 memset(&si, 0, sizeof(si)); 5123 si.cb = sizeof(si); 5124 memset(&pi, 0, sizeof(pi)); 5125 BOOL rslt = CreateProcess(NULL, // executable name - use command line 5126 cmd, // command line 5127 NULL, // process security attribute 5128 NULL, // thread security attribute 5129 TRUE, // inherits system handles 5130 0, // no creation flags 5131 NULL, // use parent's environment block 5132 NULL, // use parent's starting directory 5133 &si, // (in) startup information 5134 &pi); // (out) process information 5135 5136 if (rslt) { 5137 // Wait until child process exits. 5138 WaitForSingleObject(pi.hProcess, INFINITE); 5139 5140 DWORD exit_code; 5141 GetExitCodeProcess(pi.hProcess, &exit_code); 5142 5143 // Close process and thread handles. 5144 CloseHandle(pi.hProcess); 5145 CloseHandle(pi.hThread); 5146 5147 return (int)exit_code; 5148 } else { 5149 return -1; 5150 } 5151} 5152 5153//-------------------------------------------------------------------------------------------------- 5154// Non-product code 5155 5156static int mallocDebugIntervalCounter = 0; 5157static int mallocDebugCounter = 0; 5158bool os::check_heap(bool force) { 5159 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 5160 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 5161 // Note: HeapValidate executes two hardware breakpoints when it finds something 5162 // wrong; at these points, eax contains the address of the offending block (I think). 5163 // To get to the exlicit error message(s) below, just continue twice. 5164 HANDLE heap = GetProcessHeap(); 5165 5166 // If we fail to lock the heap, then gflags.exe has been used 5167 // or some other special heap flag has been set that prevents 5168 // locking. We don't try to walk a heap we can't lock. 5169 if (HeapLock(heap) != 0) { 5170 PROCESS_HEAP_ENTRY phe; 5171 phe.lpData = NULL; 5172 while (HeapWalk(heap, &phe) != 0) { 5173 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 5174 !HeapValidate(heap, 0, phe.lpData)) { 5175 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 5176 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 5177 fatal("corrupted C heap"); 5178 } 5179 } 5180 DWORD err = GetLastError(); 5181 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 5182 fatal(err_msg("heap walk aborted with error %d", err)); 5183 } 5184 HeapUnlock(heap); 5185 } 5186 mallocDebugIntervalCounter = 0; 5187 } 5188 return true; 5189} 5190 5191 5192bool os::find(address addr, outputStream* st) { 5193 // Nothing yet 5194 return false; 5195} 5196 5197LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 5198 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 5199 5200 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 5201 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow(); 5202 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 5203 address addr = (address) exceptionRecord->ExceptionInformation[1]; 5204 5205 if (os::is_memory_serialize_page(thread, addr)) { 5206 return EXCEPTION_CONTINUE_EXECUTION; 5207 } 5208 } 5209 5210 return EXCEPTION_CONTINUE_SEARCH; 5211} 5212 5213// We don't build a headless jre for Windows 5214bool os::is_headless_jre() { return false; } 5215 5216static jint initSock() { 5217 WSADATA wsadata; 5218 5219 if (!os::WinSock2Dll::WinSock2Available()) { 5220 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n", 5221 ::GetLastError()); 5222 return JNI_ERR; 5223 } 5224 5225 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) { 5226 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n", 5227 ::GetLastError()); 5228 return JNI_ERR; 5229 } 5230 return JNI_OK; 5231} 5232 5233struct hostent* os::get_host_by_name(char* name) { 5234 return (struct hostent*)os::WinSock2Dll::gethostbyname(name); 5235} 5236 5237int os::socket_close(int fd) { 5238 return ::closesocket(fd); 5239} 5240 5241int os::socket(int domain, int type, int protocol) { 5242 return ::socket(domain, type, protocol); 5243} 5244 5245int os::connect(int fd, struct sockaddr* him, socklen_t len) { 5246 return ::connect(fd, him, len); 5247} 5248 5249int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5250 return ::recv(fd, buf, (int)nBytes, flags); 5251} 5252 5253int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5254 return ::send(fd, buf, (int)nBytes, flags); 5255} 5256 5257int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5258 return ::send(fd, buf, (int)nBytes, flags); 5259} 5260 5261// WINDOWS CONTEXT Flags for THREAD_SAMPLING 5262#if defined(IA32) 5263 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS) 5264#elif defined (AMD64) 5265 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT) 5266#endif 5267 5268// returns true if thread could be suspended, 5269// false otherwise 5270static bool do_suspend(HANDLE* h) { 5271 if (h != NULL) { 5272 if (SuspendThread(*h) != ~0) { 5273 return true; 5274 } 5275 } 5276 return false; 5277} 5278 5279// resume the thread 5280// calling resume on an active thread is a no-op 5281static void do_resume(HANDLE* h) { 5282 if (h != NULL) { 5283 ResumeThread(*h); 5284 } 5285} 5286 5287// retrieve a suspend/resume context capable handle 5288// from the tid. Caller validates handle return value. 5289void get_thread_handle_for_extended_context(HANDLE* h, 5290 OSThread::thread_id_t tid) { 5291 if (h != NULL) { 5292 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid); 5293 } 5294} 5295 5296// Thread sampling implementation 5297// 5298void os::SuspendedThreadTask::internal_do_task() { 5299 CONTEXT ctxt; 5300 HANDLE h = NULL; 5301 5302 // get context capable handle for thread 5303 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id()); 5304 5305 // sanity 5306 if (h == NULL || h == INVALID_HANDLE_VALUE) { 5307 return; 5308 } 5309 5310 // suspend the thread 5311 if (do_suspend(&h)) { 5312 ctxt.ContextFlags = sampling_context_flags; 5313 // get thread context 5314 GetThreadContext(h, &ctxt); 5315 SuspendedThreadTaskContext context(_thread, &ctxt); 5316 // pass context to Thread Sampling impl 5317 do_task(context); 5318 // resume thread 5319 do_resume(&h); 5320 } 5321 5322 // close handle 5323 CloseHandle(h); 5324} 5325 5326 5327// Kernel32 API 5328typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void); 5329typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD); 5330typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG); 5331typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG); 5332typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG); 5333 5334GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL; 5335VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL; 5336GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL; 5337GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL; 5338RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL; 5339 5340 5341BOOL os::Kernel32Dll::initialized = FALSE; 5342SIZE_T os::Kernel32Dll::GetLargePageMinimum() { 5343 assert(initialized && _GetLargePageMinimum != NULL, 5344 "GetLargePageMinimumAvailable() not yet called"); 5345 return _GetLargePageMinimum(); 5346} 5347 5348BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() { 5349 if (!initialized) { 5350 initialize(); 5351 } 5352 return _GetLargePageMinimum != NULL; 5353} 5354 5355BOOL os::Kernel32Dll::NumaCallsAvailable() { 5356 if (!initialized) { 5357 initialize(); 5358 } 5359 return _VirtualAllocExNuma != NULL; 5360} 5361 5362LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, 5363 SIZE_T bytes, DWORD flags, 5364 DWORD prot, DWORD node) { 5365 assert(initialized && _VirtualAllocExNuma != NULL, 5366 "NUMACallsAvailable() not yet called"); 5367 5368 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node); 5369} 5370 5371BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) { 5372 assert(initialized && _GetNumaHighestNodeNumber != NULL, 5373 "NUMACallsAvailable() not yet called"); 5374 5375 return _GetNumaHighestNodeNumber(ptr_highest_node_number); 5376} 5377 5378BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, 5379 PULONGLONG proc_mask) { 5380 assert(initialized && _GetNumaNodeProcessorMask != NULL, 5381 "NUMACallsAvailable() not yet called"); 5382 5383 return _GetNumaNodeProcessorMask(node, proc_mask); 5384} 5385 5386USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip, 5387 ULONG FrameToCapture, 5388 PVOID* BackTrace, 5389 PULONG BackTraceHash) { 5390 if (!initialized) { 5391 initialize(); 5392 } 5393 5394 if (_RtlCaptureStackBackTrace != NULL) { 5395 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture, 5396 BackTrace, BackTraceHash); 5397 } else { 5398 return 0; 5399 } 5400} 5401 5402void os::Kernel32Dll::initializeCommon() { 5403 if (!initialized) { 5404 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5405 assert(handle != NULL, "Just check"); 5406 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum"); 5407 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma"); 5408 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber"); 5409 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask"); 5410 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace"); 5411 initialized = TRUE; 5412 } 5413} 5414 5415 5416 5417#ifndef JDK6_OR_EARLIER 5418 5419void os::Kernel32Dll::initialize() { 5420 initializeCommon(); 5421} 5422 5423 5424// Kernel32 API 5425inline BOOL os::Kernel32Dll::SwitchToThread() { 5426 return ::SwitchToThread(); 5427} 5428 5429inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5430 return true; 5431} 5432 5433// Help tools 5434inline BOOL os::Kernel32Dll::HelpToolsAvailable() { 5435 return true; 5436} 5437 5438inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5439 DWORD th32ProcessId) { 5440 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5441} 5442 5443inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot, 5444 LPMODULEENTRY32 lpme) { 5445 return ::Module32First(hSnapshot, lpme); 5446} 5447 5448inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5449 LPMODULEENTRY32 lpme) { 5450 return ::Module32Next(hSnapshot, lpme); 5451} 5452 5453inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5454 ::GetNativeSystemInfo(lpSystemInfo); 5455} 5456 5457// PSAPI API 5458inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, 5459 HMODULE *lpModule, DWORD cb, 5460 LPDWORD lpcbNeeded) { 5461 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5462} 5463 5464inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, 5465 HMODULE hModule, 5466 LPTSTR lpFilename, 5467 DWORD nSize) { 5468 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5469} 5470 5471inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, 5472 HMODULE hModule, 5473 LPMODULEINFO lpmodinfo, 5474 DWORD cb) { 5475 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5476} 5477 5478inline BOOL os::PSApiDll::PSApiAvailable() { 5479 return true; 5480} 5481 5482 5483// WinSock2 API 5484inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, 5485 LPWSADATA lpWSAData) { 5486 return ::WSAStartup(wVersionRequested, lpWSAData); 5487} 5488 5489inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5490 return ::gethostbyname(name); 5491} 5492 5493inline BOOL os::WinSock2Dll::WinSock2Available() { 5494 return true; 5495} 5496 5497// Advapi API 5498inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5499 BOOL DisableAllPrivileges, 5500 PTOKEN_PRIVILEGES NewState, 5501 DWORD BufferLength, 5502 PTOKEN_PRIVILEGES PreviousState, 5503 PDWORD ReturnLength) { 5504 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5505 BufferLength, PreviousState, ReturnLength); 5506} 5507 5508inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5509 DWORD DesiredAccess, 5510 PHANDLE TokenHandle) { 5511 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5512} 5513 5514inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5515 LPCTSTR lpName, 5516 PLUID lpLuid) { 5517 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5518} 5519 5520inline BOOL os::Advapi32Dll::AdvapiAvailable() { 5521 return true; 5522} 5523 5524void* os::get_default_process_handle() { 5525 return (void*)GetModuleHandle(NULL); 5526} 5527 5528// Builds a platform dependent Agent_OnLoad_<lib_name> function name 5529// which is used to find statically linked in agents. 5530// Additionally for windows, takes into account __stdcall names. 5531// Parameters: 5532// sym_name: Symbol in library we are looking for 5533// lib_name: Name of library to look in, NULL for shared libs. 5534// is_absolute_path == true if lib_name is absolute path to agent 5535// such as "C:/a/b/L.dll" 5536// == false if only the base name of the library is passed in 5537// such as "L" 5538char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 5539 bool is_absolute_path) { 5540 char *agent_entry_name; 5541 size_t len; 5542 size_t name_len; 5543 size_t prefix_len = strlen(JNI_LIB_PREFIX); 5544 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 5545 const char *start; 5546 5547 if (lib_name != NULL) { 5548 len = name_len = strlen(lib_name); 5549 if (is_absolute_path) { 5550 // Need to strip path, prefix and suffix 5551 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 5552 lib_name = ++start; 5553 } else { 5554 // Need to check for drive prefix 5555 if ((start = strchr(lib_name, ':')) != NULL) { 5556 lib_name = ++start; 5557 } 5558 } 5559 if (len <= (prefix_len + suffix_len)) { 5560 return NULL; 5561 } 5562 lib_name += prefix_len; 5563 name_len = strlen(lib_name) - suffix_len; 5564 } 5565 } 5566 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 5567 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 5568 if (agent_entry_name == NULL) { 5569 return NULL; 5570 } 5571 if (lib_name != NULL) { 5572 const char *p = strrchr(sym_name, '@'); 5573 if (p != NULL && p != sym_name) { 5574 // sym_name == _Agent_OnLoad@XX 5575 strncpy(agent_entry_name, sym_name, (p - sym_name)); 5576 agent_entry_name[(p-sym_name)] = '\0'; 5577 // agent_entry_name == _Agent_OnLoad 5578 strcat(agent_entry_name, "_"); 5579 strncat(agent_entry_name, lib_name, name_len); 5580 strcat(agent_entry_name, p); 5581 // agent_entry_name == _Agent_OnLoad_lib_name@XX 5582 } else { 5583 strcpy(agent_entry_name, sym_name); 5584 strcat(agent_entry_name, "_"); 5585 strncat(agent_entry_name, lib_name, name_len); 5586 } 5587 } else { 5588 strcpy(agent_entry_name, sym_name); 5589 } 5590 return agent_entry_name; 5591} 5592 5593#else 5594// Kernel32 API 5595typedef BOOL (WINAPI* SwitchToThread_Fn)(void); 5596typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD); 5597typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32); 5598typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32); 5599typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO); 5600 5601SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL; 5602CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL; 5603Module32First_Fn os::Kernel32Dll::_Module32First = NULL; 5604Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL; 5605GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL; 5606 5607void os::Kernel32Dll::initialize() { 5608 if (!initialized) { 5609 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5610 assert(handle != NULL, "Just check"); 5611 5612 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread"); 5613 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn) 5614 ::GetProcAddress(handle, "CreateToolhelp32Snapshot"); 5615 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First"); 5616 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next"); 5617 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo"); 5618 initializeCommon(); // resolve the functions that always need resolving 5619 5620 initialized = TRUE; 5621 } 5622} 5623 5624BOOL os::Kernel32Dll::SwitchToThread() { 5625 assert(initialized && _SwitchToThread != NULL, 5626 "SwitchToThreadAvailable() not yet called"); 5627 return _SwitchToThread(); 5628} 5629 5630 5631BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5632 if (!initialized) { 5633 initialize(); 5634 } 5635 return _SwitchToThread != NULL; 5636} 5637 5638// Help tools 5639BOOL os::Kernel32Dll::HelpToolsAvailable() { 5640 if (!initialized) { 5641 initialize(); 5642 } 5643 return _CreateToolhelp32Snapshot != NULL && 5644 _Module32First != NULL && 5645 _Module32Next != NULL; 5646} 5647 5648HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5649 DWORD th32ProcessId) { 5650 assert(initialized && _CreateToolhelp32Snapshot != NULL, 5651 "HelpToolsAvailable() not yet called"); 5652 5653 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5654} 5655 5656BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5657 assert(initialized && _Module32First != NULL, 5658 "HelpToolsAvailable() not yet called"); 5659 5660 return _Module32First(hSnapshot, lpme); 5661} 5662 5663inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5664 LPMODULEENTRY32 lpme) { 5665 assert(initialized && _Module32Next != NULL, 5666 "HelpToolsAvailable() not yet called"); 5667 5668 return _Module32Next(hSnapshot, lpme); 5669} 5670 5671 5672BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() { 5673 if (!initialized) { 5674 initialize(); 5675 } 5676 return _GetNativeSystemInfo != NULL; 5677} 5678 5679void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5680 assert(initialized && _GetNativeSystemInfo != NULL, 5681 "GetNativeSystemInfoAvailable() not yet called"); 5682 5683 _GetNativeSystemInfo(lpSystemInfo); 5684} 5685 5686// PSAPI API 5687 5688 5689typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD); 5690typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD); 5691typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD); 5692 5693EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL; 5694GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL; 5695GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL; 5696BOOL os::PSApiDll::initialized = FALSE; 5697 5698void os::PSApiDll::initialize() { 5699 if (!initialized) { 5700 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0); 5701 if (handle != NULL) { 5702 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle, 5703 "EnumProcessModules"); 5704 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle, 5705 "GetModuleFileNameExA"); 5706 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle, 5707 "GetModuleInformation"); 5708 } 5709 initialized = TRUE; 5710 } 5711} 5712 5713 5714 5715BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, 5716 DWORD cb, LPDWORD lpcbNeeded) { 5717 assert(initialized && _EnumProcessModules != NULL, 5718 "PSApiAvailable() not yet called"); 5719 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5720} 5721 5722DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, 5723 LPTSTR lpFilename, DWORD nSize) { 5724 assert(initialized && _GetModuleFileNameEx != NULL, 5725 "PSApiAvailable() not yet called"); 5726 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5727} 5728 5729BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, 5730 LPMODULEINFO lpmodinfo, DWORD cb) { 5731 assert(initialized && _GetModuleInformation != NULL, 5732 "PSApiAvailable() not yet called"); 5733 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5734} 5735 5736BOOL os::PSApiDll::PSApiAvailable() { 5737 if (!initialized) { 5738 initialize(); 5739 } 5740 return _EnumProcessModules != NULL && 5741 _GetModuleFileNameEx != NULL && 5742 _GetModuleInformation != NULL; 5743} 5744 5745 5746// WinSock2 API 5747typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA); 5748typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...); 5749 5750WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL; 5751gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL; 5752BOOL os::WinSock2Dll::initialized = FALSE; 5753 5754void os::WinSock2Dll::initialize() { 5755 if (!initialized) { 5756 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0); 5757 if (handle != NULL) { 5758 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup"); 5759 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname"); 5760 } 5761 initialized = TRUE; 5762 } 5763} 5764 5765 5766BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) { 5767 assert(initialized && _WSAStartup != NULL, 5768 "WinSock2Available() not yet called"); 5769 return _WSAStartup(wVersionRequested, lpWSAData); 5770} 5771 5772struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5773 assert(initialized && _gethostbyname != NULL, 5774 "WinSock2Available() not yet called"); 5775 return _gethostbyname(name); 5776} 5777 5778BOOL os::WinSock2Dll::WinSock2Available() { 5779 if (!initialized) { 5780 initialize(); 5781 } 5782 return _WSAStartup != NULL && 5783 _gethostbyname != NULL; 5784} 5785 5786typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 5787typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE); 5788typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID); 5789 5790AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL; 5791OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL; 5792LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL; 5793BOOL os::Advapi32Dll::initialized = FALSE; 5794 5795void os::Advapi32Dll::initialize() { 5796 if (!initialized) { 5797 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0); 5798 if (handle != NULL) { 5799 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle, 5800 "AdjustTokenPrivileges"); 5801 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle, 5802 "OpenProcessToken"); 5803 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle, 5804 "LookupPrivilegeValueA"); 5805 } 5806 initialized = TRUE; 5807 } 5808} 5809 5810BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5811 BOOL DisableAllPrivileges, 5812 PTOKEN_PRIVILEGES NewState, 5813 DWORD BufferLength, 5814 PTOKEN_PRIVILEGES PreviousState, 5815 PDWORD ReturnLength) { 5816 assert(initialized && _AdjustTokenPrivileges != NULL, 5817 "AdvapiAvailable() not yet called"); 5818 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5819 BufferLength, PreviousState, ReturnLength); 5820} 5821 5822BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5823 DWORD DesiredAccess, 5824 PHANDLE TokenHandle) { 5825 assert(initialized && _OpenProcessToken != NULL, 5826 "AdvapiAvailable() not yet called"); 5827 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5828} 5829 5830BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5831 LPCTSTR lpName, PLUID lpLuid) { 5832 assert(initialized && _LookupPrivilegeValue != NULL, 5833 "AdvapiAvailable() not yet called"); 5834 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5835} 5836 5837BOOL os::Advapi32Dll::AdvapiAvailable() { 5838 if (!initialized) { 5839 initialize(); 5840 } 5841 return _AdjustTokenPrivileges != NULL && 5842 _OpenProcessToken != NULL && 5843 _LookupPrivilegeValue != NULL; 5844} 5845 5846#endif 5847 5848#ifndef PRODUCT 5849 5850// test the code path in reserve_memory_special() that tries to allocate memory in a single 5851// contiguous memory block at a particular address. 5852// The test first tries to find a good approximate address to allocate at by using the same 5853// method to allocate some memory at any address. The test then tries to allocate memory in 5854// the vicinity (not directly after it to avoid possible by-chance use of that location) 5855// This is of course only some dodgy assumption, there is no guarantee that the vicinity of 5856// the previously allocated memory is available for allocation. The only actual failure 5857// that is reported is when the test tries to allocate at a particular location but gets a 5858// different valid one. A NULL return value at this point is not considered an error but may 5859// be legitimate. 5860// If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages. 5861void TestReserveMemorySpecial_test() { 5862 if (!UseLargePages) { 5863 if (VerboseInternalVMTests) { 5864 gclog_or_tty->print("Skipping test because large pages are disabled"); 5865 } 5866 return; 5867 } 5868 // save current value of globals 5869 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; 5870 bool old_use_numa_interleaving = UseNUMAInterleaving; 5871 5872 // set globals to make sure we hit the correct code path 5873 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; 5874 5875 // do an allocation at an address selected by the OS to get a good one. 5876 const size_t large_allocation_size = os::large_page_size() * 4; 5877 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); 5878 if (result == NULL) { 5879 if (VerboseInternalVMTests) { 5880 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.", 5881 large_allocation_size); 5882 } 5883 } else { 5884 os::release_memory_special(result, large_allocation_size); 5885 5886 // allocate another page within the recently allocated memory area which seems to be a good location. At least 5887 // we managed to get it once. 5888 const size_t expected_allocation_size = os::large_page_size(); 5889 char* expected_location = result + os::large_page_size(); 5890 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); 5891 if (actual_location == NULL) { 5892 if (VerboseInternalVMTests) { 5893 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.", 5894 expected_location, large_allocation_size); 5895 } 5896 } else { 5897 // release memory 5898 os::release_memory_special(actual_location, expected_allocation_size); 5899 // only now check, after releasing any memory to avoid any leaks. 5900 assert(actual_location == expected_location, 5901 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead", 5902 expected_location, expected_allocation_size, actual_location)); 5903 } 5904 } 5905 5906 // restore globals 5907 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; 5908 UseNUMAInterleaving = old_use_numa_interleaving; 5909} 5910#endif // PRODUCT 5911 5912