os_windows.cpp revision 8550:b8a3be10a4ed
1/* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25// Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce 26#define _WIN32_WINNT 0x0600 27 28// no precompiled headers 29#include "classfile/classLoader.hpp" 30#include "classfile/systemDictionary.hpp" 31#include "classfile/vmSymbols.hpp" 32#include "code/icBuffer.hpp" 33#include "code/vtableStubs.hpp" 34#include "compiler/compileBroker.hpp" 35#include "compiler/disassembler.hpp" 36#include "interpreter/interpreter.hpp" 37#include "jvm_windows.h" 38#include "memory/allocation.inline.hpp" 39#include "memory/filemap.hpp" 40#include "mutex_windows.inline.hpp" 41#include "oops/oop.inline.hpp" 42#include "os_share_windows.hpp" 43#include "os_windows.inline.hpp" 44#include "prims/jniFastGetField.hpp" 45#include "prims/jvm.h" 46#include "prims/jvm_misc.hpp" 47#include "runtime/arguments.hpp" 48#include "runtime/atomic.inline.hpp" 49#include "runtime/extendedPC.hpp" 50#include "runtime/globals.hpp" 51#include "runtime/interfaceSupport.hpp" 52#include "runtime/java.hpp" 53#include "runtime/javaCalls.hpp" 54#include "runtime/mutexLocker.hpp" 55#include "runtime/objectMonitor.hpp" 56#include "runtime/orderAccess.inline.hpp" 57#include "runtime/osThread.hpp" 58#include "runtime/perfMemory.hpp" 59#include "runtime/sharedRuntime.hpp" 60#include "runtime/statSampler.hpp" 61#include "runtime/stubRoutines.hpp" 62#include "runtime/thread.inline.hpp" 63#include "runtime/threadCritical.hpp" 64#include "runtime/timer.hpp" 65#include "runtime/vm_version.hpp" 66#include "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#else 118 #ifdef _M_AMD64 119 #define __CPU__ amd64 120 #else 121 #define __CPU__ i486 122 #endif 123#endif 124 125// save DLL module handle, used by GetModuleFileName 126 127HINSTANCE vm_lib_handle; 128 129BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { 130 switch (reason) { 131 case DLL_PROCESS_ATTACH: 132 vm_lib_handle = hinst; 133 if (ForceTimeHighResolution) { 134 timeBeginPeriod(1L); 135 } 136 break; 137 case DLL_PROCESS_DETACH: 138 if (ForceTimeHighResolution) { 139 timeEndPeriod(1L); 140 } 141 break; 142 default: 143 break; 144 } 145 return true; 146} 147 148static inline double fileTimeAsDouble(FILETIME* time) { 149 const double high = (double) ((unsigned int) ~0); 150 const double split = 10000000.0; 151 double result = (time->dwLowDateTime / split) + 152 time->dwHighDateTime * (high/split); 153 return result; 154} 155 156// Implementation of os 157 158bool os::unsetenv(const char* name) { 159 assert(name != NULL, "Null pointer"); 160 return (SetEnvironmentVariable(name, NULL) == TRUE); 161} 162 163// No setuid programs under Windows. 164bool os::have_special_privileges() { 165 return false; 166} 167 168 169// This method is a periodic task to check for misbehaving JNI applications 170// under CheckJNI, we can add any periodic checks here. 171// For Windows at the moment does nothing 172void os::run_periodic_checks() { 173 return; 174} 175 176// previous UnhandledExceptionFilter, if there is one 177static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL; 178 179LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 180 181void os::init_system_properties_values() { 182 // sysclasspath, java_home, dll_dir 183 { 184 char *home_path; 185 char *dll_path; 186 char *pslash; 187 char *bin = "\\bin"; 188 char home_dir[MAX_PATH + 1]; 189 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR"); 190 191 if (alt_home_dir != NULL) { 192 strncpy(home_dir, alt_home_dir, MAX_PATH + 1); 193 home_dir[MAX_PATH] = '\0'; 194 } else { 195 os::jvm_path(home_dir, sizeof(home_dir)); 196 // Found the full path to jvm.dll. 197 // Now cut the path to <java_home>/jre if we can. 198 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll 199 pslash = strrchr(home_dir, '\\'); 200 if (pslash != NULL) { 201 *pslash = '\0'; // get rid of \{client|server} 202 pslash = strrchr(home_dir, '\\'); 203 if (pslash != NULL) { 204 *pslash = '\0'; // get rid of \bin 205 } 206 } 207 } 208 209 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal); 210 if (home_path == NULL) { 211 return; 212 } 213 strcpy(home_path, home_dir); 214 Arguments::set_java_home(home_path); 215 FREE_C_HEAP_ARRAY(char, home_path); 216 217 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, 218 mtInternal); 219 if (dll_path == NULL) { 220 return; 221 } 222 strcpy(dll_path, home_dir); 223 strcat(dll_path, bin); 224 Arguments::set_dll_dir(dll_path); 225 FREE_C_HEAP_ARRAY(char, dll_path); 226 227 if (!set_boot_path('\\', ';')) { 228 return; 229 } 230 } 231 232// library_path 233#define EXT_DIR "\\lib\\ext" 234#define BIN_DIR "\\bin" 235#define PACKAGE_DIR "\\Sun\\Java" 236 { 237 // Win32 library search order (See the documentation for LoadLibrary): 238 // 239 // 1. The directory from which application is loaded. 240 // 2. The system wide Java Extensions directory (Java only) 241 // 3. System directory (GetSystemDirectory) 242 // 4. Windows directory (GetWindowsDirectory) 243 // 5. The PATH environment variable 244 // 6. The current directory 245 246 char *library_path; 247 char tmp[MAX_PATH]; 248 char *path_str = ::getenv("PATH"); 249 250 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 251 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal); 252 253 library_path[0] = '\0'; 254 255 GetModuleFileName(NULL, tmp, sizeof(tmp)); 256 *(strrchr(tmp, '\\')) = '\0'; 257 strcat(library_path, tmp); 258 259 GetWindowsDirectory(tmp, sizeof(tmp)); 260 strcat(library_path, ";"); 261 strcat(library_path, tmp); 262 strcat(library_path, PACKAGE_DIR BIN_DIR); 263 264 GetSystemDirectory(tmp, sizeof(tmp)); 265 strcat(library_path, ";"); 266 strcat(library_path, tmp); 267 268 GetWindowsDirectory(tmp, sizeof(tmp)); 269 strcat(library_path, ";"); 270 strcat(library_path, tmp); 271 272 if (path_str) { 273 strcat(library_path, ";"); 274 strcat(library_path, path_str); 275 } 276 277 strcat(library_path, ";."); 278 279 Arguments::set_library_path(library_path); 280 FREE_C_HEAP_ARRAY(char, library_path); 281 } 282 283 // Default extensions directory 284 { 285 char path[MAX_PATH]; 286 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 287 GetWindowsDirectory(path, MAX_PATH); 288 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 289 path, PACKAGE_DIR, EXT_DIR); 290 Arguments::set_ext_dirs(buf); 291 } 292 #undef EXT_DIR 293 #undef BIN_DIR 294 #undef PACKAGE_DIR 295 296#ifndef _WIN64 297 // set our UnhandledExceptionFilter and save any previous one 298 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception); 299#endif 300 301 // Done 302 return; 303} 304 305void os::breakpoint() { 306 DebugBreak(); 307} 308 309// Invoked from the BREAKPOINT Macro 310extern "C" void breakpoint() { 311 os::breakpoint(); 312} 313 314// RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP. 315// So far, this method is only used by Native Memory Tracking, which is 316// only supported on Windows XP or later. 317// 318int os::get_native_stack(address* stack, int frames, int toSkip) { 319#ifdef _NMT_NOINLINE_ 320 toSkip++; 321#endif 322 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames, 323 (PVOID*)stack, NULL); 324 for (int index = captured; index < frames; index ++) { 325 stack[index] = NULL; 326 } 327 return captured; 328} 329 330 331// os::current_stack_base() 332// 333// Returns the base of the stack, which is the stack's 334// starting address. This function must be called 335// while running on the stack of the thread being queried. 336 337address os::current_stack_base() { 338 MEMORY_BASIC_INFORMATION minfo; 339 address stack_bottom; 340 size_t stack_size; 341 342 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 343 stack_bottom = (address)minfo.AllocationBase; 344 stack_size = minfo.RegionSize; 345 346 // Add up the sizes of all the regions with the same 347 // AllocationBase. 348 while (1) { 349 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 350 if (stack_bottom == (address)minfo.AllocationBase) { 351 stack_size += minfo.RegionSize; 352 } else { 353 break; 354 } 355 } 356 357#ifdef _M_IA64 358 // IA64 has memory and register stacks 359 // 360 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit 361 // at thread creation (1MB backing store growing upwards, 1MB memory stack 362 // growing downwards, 2MB summed up) 363 // 364 // ... 365 // ------- top of stack (high address) ----- 366 // | 367 // | 1MB 368 // | Backing Store (Register Stack) 369 // | 370 // | / \ 371 // | | 372 // | | 373 // | | 374 // ------------------------ stack base ----- 375 // | 1MB 376 // | Memory Stack 377 // | 378 // | | 379 // | | 380 // | | 381 // | \ / 382 // | 383 // ----- bottom of stack (low address) ----- 384 // ... 385 386 stack_size = stack_size / 2; 387#endif 388 return stack_bottom + stack_size; 389} 390 391size_t os::current_stack_size() { 392 size_t sz; 393 MEMORY_BASIC_INFORMATION minfo; 394 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 395 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 396 return sz; 397} 398 399struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 400 const struct tm* time_struct_ptr = localtime(clock); 401 if (time_struct_ptr != NULL) { 402 *res = *time_struct_ptr; 403 return res; 404 } 405 return NULL; 406} 407 408LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 409 410// Thread start routine for all new Java threads 411static unsigned __stdcall java_start(Thread* thread) { 412 // Try to randomize the cache line index of hot stack frames. 413 // This helps when threads of the same stack traces evict each other's 414 // cache lines. The threads can be either from the same JVM instance, or 415 // from different JVM instances. The benefit is especially true for 416 // processors with hyperthreading technology. 417 static int counter = 0; 418 int pid = os::current_process_id(); 419 _alloca(((pid ^ counter++) & 7) * 128); 420 421 OSThread* osthr = thread->osthread(); 422 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 423 424 if (UseNUMA) { 425 int lgrp_id = os::numa_get_group_id(); 426 if (lgrp_id != -1) { 427 thread->set_lgrp_id(lgrp_id); 428 } 429 } 430 431 // Diagnostic code to investigate JDK-6573254 432 int res = 30115; // non-java thread 433 if (thread->is_Java_thread()) { 434 res = 20115; // java thread 435 } 436 437 // Install a win32 structured exception handler around every thread created 438 // by VM, so VM can generate error dump when an exception occurred in non- 439 // Java thread (e.g. VM thread). 440 __try { 441 thread->run(); 442 } __except(topLevelExceptionFilter( 443 (_EXCEPTION_POINTERS*)_exception_info())) { 444 // Nothing to do. 445 } 446 447 // One less thread is executing 448 // When the VMThread gets here, the main thread may have already exited 449 // which frees the CodeHeap containing the Atomic::add code 450 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 451 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); 452 } 453 454 // Thread must not return from exit_process_or_thread(), but if it does, 455 // let it proceed to exit normally 456 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res); 457} 458 459static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, 460 int thread_id) { 461 // Allocate the OSThread object 462 OSThread* osthread = new OSThread(NULL, NULL); 463 if (osthread == NULL) return NULL; 464 465 // Initialize support for Java interrupts 466 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 467 if (interrupt_event == NULL) { 468 delete osthread; 469 return NULL; 470 } 471 osthread->set_interrupt_event(interrupt_event); 472 473 // Store info on the Win32 thread into the OSThread 474 osthread->set_thread_handle(thread_handle); 475 osthread->set_thread_id(thread_id); 476 477 if (UseNUMA) { 478 int lgrp_id = os::numa_get_group_id(); 479 if (lgrp_id != -1) { 480 thread->set_lgrp_id(lgrp_id); 481 } 482 } 483 484 // Initial thread state is INITIALIZED, not SUSPENDED 485 osthread->set_state(INITIALIZED); 486 487 return osthread; 488} 489 490 491bool os::create_attached_thread(JavaThread* thread) { 492#ifdef ASSERT 493 thread->verify_not_published(); 494#endif 495 HANDLE thread_h; 496 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 497 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 498 fatal("DuplicateHandle failed\n"); 499 } 500 OSThread* osthread = create_os_thread(thread, thread_h, 501 (int)current_thread_id()); 502 if (osthread == NULL) { 503 return false; 504 } 505 506 // Initial thread state is RUNNABLE 507 osthread->set_state(RUNNABLE); 508 509 thread->set_osthread(osthread); 510 return true; 511} 512 513bool os::create_main_thread(JavaThread* thread) { 514#ifdef ASSERT 515 thread->verify_not_published(); 516#endif 517 if (_starting_thread == NULL) { 518 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 519 if (_starting_thread == NULL) { 520 return false; 521 } 522 } 523 524 // The primordial thread is runnable from the start) 525 _starting_thread->set_state(RUNNABLE); 526 527 thread->set_osthread(_starting_thread); 528 return true; 529} 530 531// Allocate and initialize a new OSThread 532bool os::create_thread(Thread* thread, ThreadType thr_type, 533 size_t stack_size) { 534 unsigned thread_id; 535 536 // Allocate the OSThread object 537 OSThread* osthread = new OSThread(NULL, NULL); 538 if (osthread == NULL) { 539 return false; 540 } 541 542 // Initialize support for Java interrupts 543 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 544 if (interrupt_event == NULL) { 545 delete osthread; 546 return NULL; 547 } 548 osthread->set_interrupt_event(interrupt_event); 549 osthread->set_interrupted(false); 550 551 thread->set_osthread(osthread); 552 553 if (stack_size == 0) { 554 switch (thr_type) { 555 case os::java_thread: 556 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 557 if (JavaThread::stack_size_at_create() > 0) { 558 stack_size = JavaThread::stack_size_at_create(); 559 } 560 break; 561 case os::compiler_thread: 562 if (CompilerThreadStackSize > 0) { 563 stack_size = (size_t)(CompilerThreadStackSize * K); 564 break; 565 } // else fall through: 566 // use VMThreadStackSize if CompilerThreadStackSize is not defined 567 case os::vm_thread: 568 case os::pgc_thread: 569 case os::cgc_thread: 570 case os::watcher_thread: 571 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 572 break; 573 } 574 } 575 576 // Create the Win32 thread 577 // 578 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 579 // does not specify stack size. Instead, it specifies the size of 580 // initially committed space. The stack size is determined by 581 // PE header in the executable. If the committed "stack_size" is larger 582 // than default value in the PE header, the stack is rounded up to the 583 // nearest multiple of 1MB. For example if the launcher has default 584 // stack size of 320k, specifying any size less than 320k does not 585 // affect the actual stack size at all, it only affects the initial 586 // commitment. On the other hand, specifying 'stack_size' larger than 587 // default value may cause significant increase in memory usage, because 588 // not only the stack space will be rounded up to MB, but also the 589 // entire space is committed upfront. 590 // 591 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 592 // for CreateThread() that can treat 'stack_size' as stack size. However we 593 // are not supposed to call CreateThread() directly according to MSDN 594 // document because JVM uses C runtime library. The good news is that the 595 // flag appears to work with _beginthredex() as well. 596 597#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION 598 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000) 599#endif 600 601 HANDLE thread_handle = 602 (HANDLE)_beginthreadex(NULL, 603 (unsigned)stack_size, 604 (unsigned (__stdcall *)(void*)) java_start, 605 thread, 606 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, 607 &thread_id); 608 if (thread_handle == NULL) { 609 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again 610 // without the flag. 611 thread_handle = 612 (HANDLE)_beginthreadex(NULL, 613 (unsigned)stack_size, 614 (unsigned (__stdcall *)(void*)) java_start, 615 thread, 616 CREATE_SUSPENDED, 617 &thread_id); 618 } 619 if (thread_handle == NULL) { 620 // Need to clean up stuff we've allocated so far 621 CloseHandle(osthread->interrupt_event()); 622 thread->set_osthread(NULL); 623 delete osthread; 624 return NULL; 625 } 626 627 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); 628 629 // Store info on the Win32 thread into the OSThread 630 osthread->set_thread_handle(thread_handle); 631 osthread->set_thread_id(thread_id); 632 633 // Initial thread state is INITIALIZED, not SUSPENDED 634 osthread->set_state(INITIALIZED); 635 636 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 637 return true; 638} 639 640 641// Free Win32 resources related to the OSThread 642void os::free_thread(OSThread* osthread) { 643 assert(osthread != NULL, "osthread not set"); 644 CloseHandle(osthread->thread_handle()); 645 CloseHandle(osthread->interrupt_event()); 646 delete osthread; 647} 648 649static jlong first_filetime; 650static jlong initial_performance_count; 651static jlong performance_frequency; 652 653 654jlong as_long(LARGE_INTEGER x) { 655 jlong result = 0; // initialization to avoid warning 656 set_high(&result, x.HighPart); 657 set_low(&result, x.LowPart); 658 return result; 659} 660 661 662jlong os::elapsed_counter() { 663 LARGE_INTEGER count; 664 if (win32::_has_performance_count) { 665 QueryPerformanceCounter(&count); 666 return as_long(count) - initial_performance_count; 667 } else { 668 FILETIME wt; 669 GetSystemTimeAsFileTime(&wt); 670 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime); 671 } 672} 673 674 675jlong os::elapsed_frequency() { 676 if (win32::_has_performance_count) { 677 return performance_frequency; 678 } else { 679 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601. 680 return 10000000; 681 } 682} 683 684 685julong os::available_memory() { 686 return win32::available_memory(); 687} 688 689julong os::win32::available_memory() { 690 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 691 // value if total memory is larger than 4GB 692 MEMORYSTATUSEX ms; 693 ms.dwLength = sizeof(ms); 694 GlobalMemoryStatusEx(&ms); 695 696 return (julong)ms.ullAvailPhys; 697} 698 699julong os::physical_memory() { 700 return win32::physical_memory(); 701} 702 703bool os::has_allocatable_memory_limit(julong* limit) { 704 MEMORYSTATUSEX ms; 705 ms.dwLength = sizeof(ms); 706 GlobalMemoryStatusEx(&ms); 707#ifdef _LP64 708 *limit = (julong)ms.ullAvailVirtual; 709 return true; 710#else 711 // Limit to 1400m because of the 2gb address space wall 712 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual); 713 return true; 714#endif 715} 716 717// VC6 lacks DWORD_PTR 718#if _MSC_VER < 1300 719typedef UINT_PTR DWORD_PTR; 720#endif 721 722int os::active_processor_count() { 723 DWORD_PTR lpProcessAffinityMask = 0; 724 DWORD_PTR lpSystemAffinityMask = 0; 725 int proc_count = processor_count(); 726 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 727 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 728 // Nof active processors is number of bits in process affinity mask 729 int bitcount = 0; 730 while (lpProcessAffinityMask != 0) { 731 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 732 bitcount++; 733 } 734 return bitcount; 735 } else { 736 return proc_count; 737 } 738} 739 740void os::set_native_thread_name(const char *name) { 741 742 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx 743 // 744 // Note that unfortunately this only works if the process 745 // is already attached to a debugger; debugger must observe 746 // the exception below to show the correct name. 747 748 const DWORD MS_VC_EXCEPTION = 0x406D1388; 749 struct { 750 DWORD dwType; // must be 0x1000 751 LPCSTR szName; // pointer to name (in user addr space) 752 DWORD dwThreadID; // thread ID (-1=caller thread) 753 DWORD dwFlags; // reserved for future use, must be zero 754 } info; 755 756 info.dwType = 0x1000; 757 info.szName = name; 758 info.dwThreadID = -1; 759 info.dwFlags = 0; 760 761 __try { 762 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info ); 763 } __except(EXCEPTION_CONTINUE_EXECUTION) {} 764} 765 766bool os::distribute_processes(uint length, uint* distribution) { 767 // Not yet implemented. 768 return false; 769} 770 771bool os::bind_to_processor(uint processor_id) { 772 // Not yet implemented. 773 return false; 774} 775 776void os::win32::initialize_performance_counter() { 777 LARGE_INTEGER count; 778 if (QueryPerformanceFrequency(&count)) { 779 win32::_has_performance_count = 1; 780 performance_frequency = as_long(count); 781 QueryPerformanceCounter(&count); 782 initial_performance_count = as_long(count); 783 } else { 784 win32::_has_performance_count = 0; 785 FILETIME wt; 786 GetSystemTimeAsFileTime(&wt); 787 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 788 } 789} 790 791 792double os::elapsedTime() { 793 return (double) elapsed_counter() / (double) elapsed_frequency(); 794} 795 796 797// Windows format: 798// The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 799// Java format: 800// Java standards require the number of milliseconds since 1/1/1970 801 802// Constant offset - calculated using offset() 803static jlong _offset = 116444736000000000; 804// Fake time counter for reproducible results when debugging 805static jlong fake_time = 0; 806 807#ifdef ASSERT 808// Just to be safe, recalculate the offset in debug mode 809static jlong _calculated_offset = 0; 810static int _has_calculated_offset = 0; 811 812jlong offset() { 813 if (_has_calculated_offset) return _calculated_offset; 814 SYSTEMTIME java_origin; 815 java_origin.wYear = 1970; 816 java_origin.wMonth = 1; 817 java_origin.wDayOfWeek = 0; // ignored 818 java_origin.wDay = 1; 819 java_origin.wHour = 0; 820 java_origin.wMinute = 0; 821 java_origin.wSecond = 0; 822 java_origin.wMilliseconds = 0; 823 FILETIME jot; 824 if (!SystemTimeToFileTime(&java_origin, &jot)) { 825 fatal(err_msg("Error = %d\nWindows error", GetLastError())); 826 } 827 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 828 _has_calculated_offset = 1; 829 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 830 return _calculated_offset; 831} 832#else 833jlong offset() { 834 return _offset; 835} 836#endif 837 838jlong windows_to_java_time(FILETIME wt) { 839 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 840 return (a - offset()) / 10000; 841} 842 843// Returns time ticks in (10th of micro seconds) 844jlong windows_to_time_ticks(FILETIME wt) { 845 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 846 return (a - offset()); 847} 848 849FILETIME java_to_windows_time(jlong l) { 850 jlong a = (l * 10000) + offset(); 851 FILETIME result; 852 result.dwHighDateTime = high(a); 853 result.dwLowDateTime = low(a); 854 return result; 855} 856 857bool os::supports_vtime() { return true; } 858bool os::enable_vtime() { return false; } 859bool os::vtime_enabled() { return false; } 860 861double os::elapsedVTime() { 862 FILETIME created; 863 FILETIME exited; 864 FILETIME kernel; 865 FILETIME user; 866 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) { 867 // the resolution of windows_to_java_time() should be sufficient (ms) 868 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS; 869 } else { 870 return elapsedTime(); 871 } 872} 873 874jlong os::javaTimeMillis() { 875 if (UseFakeTimers) { 876 return fake_time++; 877 } else { 878 FILETIME wt; 879 GetSystemTimeAsFileTime(&wt); 880 return windows_to_java_time(wt); 881 } 882} 883 884void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 885 FILETIME wt; 886 GetSystemTimeAsFileTime(&wt); 887 jlong ticks = windows_to_time_ticks(wt); // 10th of micros 888 jlong secs = jlong(ticks / 10000000); // 10000 * 1000 889 seconds = secs; 890 nanos = jlong(ticks - (secs*10000000)) * 100; 891} 892 893jlong os::javaTimeNanos() { 894 if (!win32::_has_performance_count) { 895 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do. 896 } else { 897 LARGE_INTEGER current_count; 898 QueryPerformanceCounter(¤t_count); 899 double current = as_long(current_count); 900 double freq = performance_frequency; 901 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC); 902 return time; 903 } 904} 905 906void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 907 if (!win32::_has_performance_count) { 908 // javaTimeMillis() doesn't have much percision, 909 // but it is not going to wrap -- so all 64 bits 910 info_ptr->max_value = ALL_64_BITS; 911 912 // this is a wall clock timer, so may skip 913 info_ptr->may_skip_backward = true; 914 info_ptr->may_skip_forward = true; 915 } else { 916 jlong freq = performance_frequency; 917 if (freq < NANOSECS_PER_SEC) { 918 // the performance counter is 64 bits and we will 919 // be multiplying it -- so no wrap in 64 bits 920 info_ptr->max_value = ALL_64_BITS; 921 } else if (freq > NANOSECS_PER_SEC) { 922 // use the max value the counter can reach to 923 // determine the max value which could be returned 924 julong max_counter = (julong)ALL_64_BITS; 925 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC)); 926 } else { 927 // the performance counter is 64 bits and we will 928 // be using it directly -- so no wrap in 64 bits 929 info_ptr->max_value = ALL_64_BITS; 930 } 931 932 // using a counter, so no skipping 933 info_ptr->may_skip_backward = false; 934 info_ptr->may_skip_forward = false; 935 } 936 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 937} 938 939char* os::local_time_string(char *buf, size_t buflen) { 940 SYSTEMTIME st; 941 GetLocalTime(&st); 942 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 943 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 944 return buf; 945} 946 947bool os::getTimesSecs(double* process_real_time, 948 double* process_user_time, 949 double* process_system_time) { 950 HANDLE h_process = GetCurrentProcess(); 951 FILETIME create_time, exit_time, kernel_time, user_time; 952 BOOL result = GetProcessTimes(h_process, 953 &create_time, 954 &exit_time, 955 &kernel_time, 956 &user_time); 957 if (result != 0) { 958 FILETIME wt; 959 GetSystemTimeAsFileTime(&wt); 960 jlong rtc_millis = windows_to_java_time(wt); 961 jlong user_millis = windows_to_java_time(user_time); 962 jlong system_millis = windows_to_java_time(kernel_time); 963 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 964 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); 965 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); 966 return true; 967 } else { 968 return false; 969 } 970} 971 972void os::shutdown() { 973 // allow PerfMemory to attempt cleanup of any persistent resources 974 perfMemory_exit(); 975 976 // flush buffered output, finish log files 977 ostream_abort(); 978 979 // Check for abort hook 980 abort_hook_t abort_hook = Arguments::abort_hook(); 981 if (abort_hook != NULL) { 982 abort_hook(); 983 } 984} 985 986 987static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 988 PMINIDUMP_EXCEPTION_INFORMATION, 989 PMINIDUMP_USER_STREAM_INFORMATION, 990 PMINIDUMP_CALLBACK_INFORMATION); 991 992static HANDLE dumpFile = NULL; 993 994// Check if dump file can be created. 995void os::check_dump_limit(char* buffer, size_t buffsz) { 996 bool status = true; 997 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) { 998 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line"); 999 status = false; 1000 } 1001 1002#ifndef ASSERT 1003 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) { 1004 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows"); 1005 status = false; 1006 } 1007#endif 1008 1009 if (status) { 1010 const char* cwd = get_current_directory(NULL, 0); 1011 int pid = current_process_id(); 1012 if (cwd != NULL) { 1013 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid); 1014 } else { 1015 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid); 1016 } 1017 1018 if (dumpFile == NULL && 1019 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL)) 1020 == INVALID_HANDLE_VALUE) { 1021 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError()); 1022 status = false; 1023 } 1024 } 1025 VMError::record_coredump_status(buffer, status); 1026} 1027 1028void os::abort(bool dump_core, void* siginfo, void* context) { 1029 HINSTANCE dbghelp; 1030 EXCEPTION_POINTERS ep; 1031 MINIDUMP_EXCEPTION_INFORMATION mei; 1032 MINIDUMP_EXCEPTION_INFORMATION* pmei; 1033 1034 HANDLE hProcess = GetCurrentProcess(); 1035 DWORD processId = GetCurrentProcessId(); 1036 MINIDUMP_TYPE dumpType; 1037 1038 shutdown(); 1039 if (!dump_core || dumpFile == NULL) { 1040 if (dumpFile != NULL) { 1041 CloseHandle(dumpFile); 1042 } 1043 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1044 } 1045 1046 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0); 1047 1048 if (dbghelp == NULL) { 1049 jio_fprintf(stderr, "Failed to load dbghelp.dll\n"); 1050 CloseHandle(dumpFile); 1051 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1052 } 1053 1054 _MiniDumpWriteDump = 1055 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, 1056 PMINIDUMP_EXCEPTION_INFORMATION, 1057 PMINIDUMP_USER_STREAM_INFORMATION, 1058 PMINIDUMP_CALLBACK_INFORMATION), 1059 GetProcAddress(dbghelp, 1060 "MiniDumpWriteDump")); 1061 1062 if (_MiniDumpWriteDump == NULL) { 1063 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n"); 1064 CloseHandle(dumpFile); 1065 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1066 } 1067 1068 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData); 1069 1070 // Older versions of dbghelp.h do not contain all the dumptypes we want, dbghelp.h with 1071 // API_VERSION_NUMBER 11 or higher contains the ones we want though 1072#if API_VERSION_NUMBER >= 11 1073 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | 1074 MiniDumpWithUnloadedModules); 1075#endif 1076 1077 if (siginfo != NULL && context != NULL) { 1078 ep.ContextRecord = (PCONTEXT) context; 1079 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo; 1080 1081 mei.ThreadId = GetCurrentThreadId(); 1082 mei.ExceptionPointers = &ep; 1083 pmei = &mei; 1084 } else { 1085 pmei = NULL; 1086 } 1087 1088 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all 1089 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then. 1090 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false && 1091 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) { 1092 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError()); 1093 } 1094 CloseHandle(dumpFile); 1095 win32::exit_process_or_thread(win32::EPT_PROCESS, 1); 1096} 1097 1098// Die immediately, no exit hook, no abort hook, no cleanup. 1099void os::die() { 1100 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1); 1101} 1102 1103// Directory routines copied from src/win32/native/java/io/dirent_md.c 1104// * dirent_md.c 1.15 00/02/02 1105// 1106// The declarations for DIR and struct dirent are in jvm_win32.h. 1107 1108// Caller must have already run dirname through JVM_NativePath, which removes 1109// duplicate slashes and converts all instances of '/' into '\\'. 1110 1111DIR * os::opendir(const char *dirname) { 1112 assert(dirname != NULL, "just checking"); // hotspot change 1113 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal); 1114 DWORD fattr; // hotspot change 1115 char alt_dirname[4] = { 0, 0, 0, 0 }; 1116 1117 if (dirp == 0) { 1118 errno = ENOMEM; 1119 return 0; 1120 } 1121 1122 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it 1123 // as a directory in FindFirstFile(). We detect this case here and 1124 // prepend the current drive name. 1125 // 1126 if (dirname[1] == '\0' && dirname[0] == '\\') { 1127 alt_dirname[0] = _getdrive() + 'A' - 1; 1128 alt_dirname[1] = ':'; 1129 alt_dirname[2] = '\\'; 1130 alt_dirname[3] = '\0'; 1131 dirname = alt_dirname; 1132 } 1133 1134 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal); 1135 if (dirp->path == 0) { 1136 free(dirp); 1137 errno = ENOMEM; 1138 return 0; 1139 } 1140 strcpy(dirp->path, dirname); 1141 1142 fattr = GetFileAttributes(dirp->path); 1143 if (fattr == 0xffffffff) { 1144 free(dirp->path); 1145 free(dirp); 1146 errno = ENOENT; 1147 return 0; 1148 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 1149 free(dirp->path); 1150 free(dirp); 1151 errno = ENOTDIR; 1152 return 0; 1153 } 1154 1155 // Append "*.*", or possibly "\\*.*", to path 1156 if (dirp->path[1] == ':' && 1157 (dirp->path[2] == '\0' || 1158 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 1159 // No '\\' needed for cases like "Z:" or "Z:\" 1160 strcat(dirp->path, "*.*"); 1161 } else { 1162 strcat(dirp->path, "\\*.*"); 1163 } 1164 1165 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 1166 if (dirp->handle == INVALID_HANDLE_VALUE) { 1167 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 1168 free(dirp->path); 1169 free(dirp); 1170 errno = EACCES; 1171 return 0; 1172 } 1173 } 1174 return dirp; 1175} 1176 1177// parameter dbuf unused on Windows 1178struct dirent * os::readdir(DIR *dirp, dirent *dbuf) { 1179 assert(dirp != NULL, "just checking"); // hotspot change 1180 if (dirp->handle == INVALID_HANDLE_VALUE) { 1181 return 0; 1182 } 1183 1184 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 1185 1186 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 1187 if (GetLastError() == ERROR_INVALID_HANDLE) { 1188 errno = EBADF; 1189 return 0; 1190 } 1191 FindClose(dirp->handle); 1192 dirp->handle = INVALID_HANDLE_VALUE; 1193 } 1194 1195 return &dirp->dirent; 1196} 1197 1198int os::closedir(DIR *dirp) { 1199 assert(dirp != NULL, "just checking"); // hotspot change 1200 if (dirp->handle != INVALID_HANDLE_VALUE) { 1201 if (!FindClose(dirp->handle)) { 1202 errno = EBADF; 1203 return -1; 1204 } 1205 dirp->handle = INVALID_HANDLE_VALUE; 1206 } 1207 free(dirp->path); 1208 free(dirp); 1209 return 0; 1210} 1211 1212// This must be hard coded because it's the system's temporary 1213// directory not the java application's temp directory, ala java.io.tmpdir. 1214const char* os::get_temp_directory() { 1215 static char path_buf[MAX_PATH]; 1216 if (GetTempPath(MAX_PATH, path_buf) > 0) { 1217 return path_buf; 1218 } else { 1219 path_buf[0] = '\0'; 1220 return path_buf; 1221 } 1222} 1223 1224static bool file_exists(const char* filename) { 1225 if (filename == NULL || strlen(filename) == 0) { 1226 return false; 1227 } 1228 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES; 1229} 1230 1231bool os::dll_build_name(char *buffer, size_t buflen, 1232 const char* pname, const char* fname) { 1233 bool retval = false; 1234 const size_t pnamelen = pname ? strlen(pname) : 0; 1235 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0; 1236 1237 // Return error on buffer overflow. 1238 if (pnamelen + strlen(fname) + 10 > buflen) { 1239 return retval; 1240 } 1241 1242 if (pnamelen == 0) { 1243 jio_snprintf(buffer, buflen, "%s.dll", fname); 1244 retval = true; 1245 } else if (c == ':' || c == '\\') { 1246 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname); 1247 retval = true; 1248 } else if (strchr(pname, *os::path_separator()) != NULL) { 1249 int n; 1250 char** pelements = split_path(pname, &n); 1251 if (pelements == NULL) { 1252 return false; 1253 } 1254 for (int i = 0; i < n; i++) { 1255 char* path = pelements[i]; 1256 // Really shouldn't be NULL, but check can't hurt 1257 size_t plen = (path == NULL) ? 0 : strlen(path); 1258 if (plen == 0) { 1259 continue; // skip the empty path values 1260 } 1261 const char lastchar = path[plen - 1]; 1262 if (lastchar == ':' || lastchar == '\\') { 1263 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname); 1264 } else { 1265 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname); 1266 } 1267 if (file_exists(buffer)) { 1268 retval = true; 1269 break; 1270 } 1271 } 1272 // release the storage 1273 for (int i = 0; i < n; i++) { 1274 if (pelements[i] != NULL) { 1275 FREE_C_HEAP_ARRAY(char, pelements[i]); 1276 } 1277 } 1278 if (pelements != NULL) { 1279 FREE_C_HEAP_ARRAY(char*, pelements); 1280 } 1281 } else { 1282 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname); 1283 retval = true; 1284 } 1285 return retval; 1286} 1287 1288// Needs to be in os specific directory because windows requires another 1289// header file <direct.h> 1290const char* os::get_current_directory(char *buf, size_t buflen) { 1291 int n = static_cast<int>(buflen); 1292 if (buflen > INT_MAX) n = INT_MAX; 1293 return _getcwd(buf, n); 1294} 1295 1296//----------------------------------------------------------- 1297// Helper functions for fatal error handler 1298#ifdef _WIN64 1299// Helper routine which returns true if address in 1300// within the NTDLL address space. 1301// 1302static bool _addr_in_ntdll(address addr) { 1303 HMODULE hmod; 1304 MODULEINFO minfo; 1305 1306 hmod = GetModuleHandle("NTDLL.DLL"); 1307 if (hmod == NULL) return false; 1308 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod, 1309 &minfo, sizeof(MODULEINFO))) { 1310 return false; 1311 } 1312 1313 if ((addr >= minfo.lpBaseOfDll) && 1314 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) { 1315 return true; 1316 } else { 1317 return false; 1318 } 1319} 1320#endif 1321 1322struct _modinfo { 1323 address addr; 1324 char* full_path; // point to a char buffer 1325 int buflen; // size of the buffer 1326 address base_addr; 1327}; 1328 1329static int _locate_module_by_addr(const char * mod_fname, address base_addr, 1330 address top_address, void * param) { 1331 struct _modinfo *pmod = (struct _modinfo *)param; 1332 if (!pmod) return -1; 1333 1334 if (base_addr <= pmod->addr && 1335 top_address > pmod->addr) { 1336 // if a buffer is provided, copy path name to the buffer 1337 if (pmod->full_path) { 1338 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1339 } 1340 pmod->base_addr = base_addr; 1341 return 1; 1342 } 1343 return 0; 1344} 1345 1346bool os::dll_address_to_library_name(address addr, char* buf, 1347 int buflen, int* offset) { 1348 // buf is not optional, but offset is optional 1349 assert(buf != NULL, "sanity check"); 1350 1351// NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1352// return the full path to the DLL file, sometimes it returns path 1353// to the corresponding PDB file (debug info); sometimes it only 1354// returns partial path, which makes life painful. 1355 1356 struct _modinfo mi; 1357 mi.addr = addr; 1358 mi.full_path = buf; 1359 mi.buflen = buflen; 1360 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) { 1361 // buf already contains path name 1362 if (offset) *offset = addr - mi.base_addr; 1363 return true; 1364 } 1365 1366 buf[0] = '\0'; 1367 if (offset) *offset = -1; 1368 return false; 1369} 1370 1371bool os::dll_address_to_function_name(address addr, char *buf, 1372 int buflen, int *offset, 1373 bool demangle) { 1374 // buf is not optional, but offset is optional 1375 assert(buf != NULL, "sanity check"); 1376 1377 if (Decoder::decode(addr, buf, buflen, offset, demangle)) { 1378 return true; 1379 } 1380 if (offset != NULL) *offset = -1; 1381 buf[0] = '\0'; 1382 return false; 1383} 1384 1385// save the start and end address of jvm.dll into param[0] and param[1] 1386static int _locate_jvm_dll(const char* mod_fname, address base_addr, 1387 address top_address, void * param) { 1388 if (!param) return -1; 1389 1390 if (base_addr <= (address)_locate_jvm_dll && 1391 top_address > (address)_locate_jvm_dll) { 1392 ((address*)param)[0] = base_addr; 1393 ((address*)param)[1] = top_address; 1394 return 1; 1395 } 1396 return 0; 1397} 1398 1399address vm_lib_location[2]; // start and end address of jvm.dll 1400 1401// check if addr is inside jvm.dll 1402bool os::address_is_in_vm(address addr) { 1403 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1404 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) { 1405 assert(false, "Can't find jvm module."); 1406 return false; 1407 } 1408 } 1409 1410 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1411} 1412 1413// print module info; param is outputStream* 1414static int _print_module(const char* fname, address base_address, 1415 address top_address, void* param) { 1416 if (!param) return -1; 1417 1418 outputStream* st = (outputStream*)param; 1419 1420 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname); 1421 return 0; 1422} 1423 1424// Loads .dll/.so and 1425// in case of error it checks if .dll/.so was built for the 1426// same architecture as Hotspot is running on 1427void * os::dll_load(const char *name, char *ebuf, int ebuflen) { 1428 void * result = LoadLibrary(name); 1429 if (result != NULL) { 1430 return result; 1431 } 1432 1433 DWORD errcode = GetLastError(); 1434 if (errcode == ERROR_MOD_NOT_FOUND) { 1435 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1); 1436 ebuf[ebuflen - 1] = '\0'; 1437 return NULL; 1438 } 1439 1440 // Parsing dll below 1441 // If we can read dll-info and find that dll was built 1442 // for an architecture other than Hotspot is running in 1443 // - then print to buffer "DLL was built for a different architecture" 1444 // else call os::lasterror to obtain system error message 1445 1446 // Read system error message into ebuf 1447 // It may or may not be overwritten below (in the for loop and just above) 1448 lasterror(ebuf, (size_t) ebuflen); 1449 ebuf[ebuflen - 1] = '\0'; 1450 int fd = ::open(name, O_RDONLY | O_BINARY, 0); 1451 if (fd < 0) { 1452 return NULL; 1453 } 1454 1455 uint32_t signature_offset; 1456 uint16_t lib_arch = 0; 1457 bool failed_to_get_lib_arch = 1458 ( // Go to position 3c in the dll 1459 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0) 1460 || 1461 // Read location of signature 1462 (sizeof(signature_offset) != 1463 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset)))) 1464 || 1465 // Go to COFF File Header in dll 1466 // that is located after "signature" (4 bytes long) 1467 (os::seek_to_file_offset(fd, 1468 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0) 1469 || 1470 // Read field that contains code of architecture 1471 // that dll was built for 1472 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch)))) 1473 ); 1474 1475 ::close(fd); 1476 if (failed_to_get_lib_arch) { 1477 // file i/o error - report os::lasterror(...) msg 1478 return NULL; 1479 } 1480 1481 typedef struct { 1482 uint16_t arch_code; 1483 char* arch_name; 1484 } arch_t; 1485 1486 static const arch_t arch_array[] = { 1487 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1488 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1489 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1490 }; 1491#if (defined _M_IA64) 1492 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64; 1493#elif (defined _M_AMD64) 1494 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64; 1495#elif (defined _M_IX86) 1496 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386; 1497#else 1498 #error Method os::dll_load requires that one of following \ 1499 is defined :_M_IA64,_M_AMD64 or _M_IX86 1500#endif 1501 1502 1503 // Obtain a string for printf operation 1504 // lib_arch_str shall contain string what platform this .dll was built for 1505 // running_arch_str shall string contain what platform Hotspot was built for 1506 char *running_arch_str = NULL, *lib_arch_str = NULL; 1507 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) { 1508 if (lib_arch == arch_array[i].arch_code) { 1509 lib_arch_str = arch_array[i].arch_name; 1510 } 1511 if (running_arch == arch_array[i].arch_code) { 1512 running_arch_str = arch_array[i].arch_name; 1513 } 1514 } 1515 1516 assert(running_arch_str, 1517 "Didn't find running architecture code in arch_array"); 1518 1519 // If the architecture is right 1520 // but some other error took place - report os::lasterror(...) msg 1521 if (lib_arch == running_arch) { 1522 return NULL; 1523 } 1524 1525 if (lib_arch_str != NULL) { 1526 ::_snprintf(ebuf, ebuflen - 1, 1527 "Can't load %s-bit .dll on a %s-bit platform", 1528 lib_arch_str, running_arch_str); 1529 } else { 1530 // don't know what architecture this dll was build for 1531 ::_snprintf(ebuf, ebuflen - 1, 1532 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1533 lib_arch, running_arch_str); 1534 } 1535 1536 return NULL; 1537} 1538 1539void os::print_dll_info(outputStream *st) { 1540 st->print_cr("Dynamic libraries:"); 1541 get_loaded_modules_info(_print_module, (void *)st); 1542} 1543 1544int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1545 HANDLE hProcess; 1546 1547# define MAX_NUM_MODULES 128 1548 HMODULE modules[MAX_NUM_MODULES]; 1549 static char filename[MAX_PATH]; 1550 int result = 0; 1551 1552 if (!os::PSApiDll::PSApiAvailable()) { 1553 return 0; 1554 } 1555 1556 int pid = os::current_process_id(); 1557 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1558 FALSE, pid); 1559 if (hProcess == NULL) return 0; 1560 1561 DWORD size_needed; 1562 if (!os::PSApiDll::EnumProcessModules(hProcess, modules, 1563 sizeof(modules), &size_needed)) { 1564 CloseHandle(hProcess); 1565 return 0; 1566 } 1567 1568 // number of modules that are currently loaded 1569 int num_modules = size_needed / sizeof(HMODULE); 1570 1571 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1572 // Get Full pathname: 1573 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i], 1574 filename, sizeof(filename))) { 1575 filename[0] = '\0'; 1576 } 1577 1578 MODULEINFO modinfo; 1579 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i], 1580 &modinfo, sizeof(modinfo))) { 1581 modinfo.lpBaseOfDll = NULL; 1582 modinfo.SizeOfImage = 0; 1583 } 1584 1585 // Invoke callback function 1586 result = callback(filename, (address)modinfo.lpBaseOfDll, 1587 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param); 1588 if (result) break; 1589 } 1590 1591 CloseHandle(hProcess); 1592 return result; 1593} 1594 1595void os::print_os_info_brief(outputStream* st) { 1596 os::print_os_info(st); 1597} 1598 1599void os::print_os_info(outputStream* st) { 1600#ifdef ASSERT 1601 char buffer[1024]; 1602 DWORD size = sizeof(buffer); 1603 st->print(" HostName: "); 1604 if (GetComputerNameEx(ComputerNameDnsHostname, buffer, &size)) { 1605 st->print("%s", buffer); 1606 } else { 1607 st->print("N/A"); 1608 } 1609#endif 1610 st->print(" OS:"); 1611 os::win32::print_windows_version(st); 1612} 1613 1614void os::win32::print_windows_version(outputStream* st) { 1615 OSVERSIONINFOEX osvi; 1616 VS_FIXEDFILEINFO *file_info; 1617 TCHAR kernel32_path[MAX_PATH]; 1618 UINT len, ret; 1619 1620 // Use the GetVersionEx information to see if we're on a server or 1621 // workstation edition of Windows. Starting with Windows 8.1 we can't 1622 // trust the OS version information returned by this API. 1623 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1624 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1625 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1626 st->print_cr("Call to GetVersionEx failed"); 1627 return; 1628 } 1629 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION); 1630 1631 // Get the full path to \Windows\System32\kernel32.dll and use that for 1632 // determining what version of Windows we're running on. 1633 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1; 1634 ret = GetSystemDirectory(kernel32_path, len); 1635 if (ret == 0 || ret > len) { 1636 st->print_cr("Call to GetSystemDirectory failed"); 1637 return; 1638 } 1639 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret); 1640 1641 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL); 1642 if (version_size == 0) { 1643 st->print_cr("Call to GetFileVersionInfoSize failed"); 1644 return; 1645 } 1646 1647 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal); 1648 if (version_info == NULL) { 1649 st->print_cr("Failed to allocate version_info"); 1650 return; 1651 } 1652 1653 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) { 1654 os::free(version_info); 1655 st->print_cr("Call to GetFileVersionInfo failed"); 1656 return; 1657 } 1658 1659 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) { 1660 os::free(version_info); 1661 st->print_cr("Call to VerQueryValue failed"); 1662 return; 1663 } 1664 1665 int major_version = HIWORD(file_info->dwProductVersionMS); 1666 int minor_version = LOWORD(file_info->dwProductVersionMS); 1667 int build_number = HIWORD(file_info->dwProductVersionLS); 1668 int build_minor = LOWORD(file_info->dwProductVersionLS); 1669 int os_vers = major_version * 1000 + minor_version; 1670 os::free(version_info); 1671 1672 st->print(" Windows "); 1673 switch (os_vers) { 1674 1675 case 6000: 1676 if (is_workstation) { 1677 st->print("Vista"); 1678 } else { 1679 st->print("Server 2008"); 1680 } 1681 break; 1682 1683 case 6001: 1684 if (is_workstation) { 1685 st->print("7"); 1686 } else { 1687 st->print("Server 2008 R2"); 1688 } 1689 break; 1690 1691 case 6002: 1692 if (is_workstation) { 1693 st->print("8"); 1694 } else { 1695 st->print("Server 2012"); 1696 } 1697 break; 1698 1699 case 6003: 1700 if (is_workstation) { 1701 st->print("8.1"); 1702 } else { 1703 st->print("Server 2012 R2"); 1704 } 1705 break; 1706 1707 case 10000: 1708 if (is_workstation) { 1709 st->print("10"); 1710 } else { 1711 // The server version name of Windows 10 is not known at this time 1712 st->print("%d.%d", major_version, minor_version); 1713 } 1714 break; 1715 1716 default: 1717 // Unrecognized windows, print out its major and minor versions 1718 st->print("%d.%d", major_version, minor_version); 1719 break; 1720 } 1721 1722 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1723 // find out whether we are running on 64 bit processor or not 1724 SYSTEM_INFO si; 1725 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1726 os::Kernel32Dll::GetNativeSystemInfo(&si); 1727 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1728 st->print(" , 64 bit"); 1729 } 1730 1731 st->print(" Build %d", build_number); 1732 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor); 1733 st->cr(); 1734} 1735 1736void os::pd_print_cpu_info(outputStream* st) { 1737 // Nothing to do for now. 1738} 1739 1740void os::print_memory_info(outputStream* st) { 1741 st->print("Memory:"); 1742 st->print(" %dk page", os::vm_page_size()>>10); 1743 1744 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1745 // value if total memory is larger than 4GB 1746 MEMORYSTATUSEX ms; 1747 ms.dwLength = sizeof(ms); 1748 GlobalMemoryStatusEx(&ms); 1749 1750 st->print(", physical %uk", os::physical_memory() >> 10); 1751 st->print("(%uk free)", os::available_memory() >> 10); 1752 1753 st->print(", swap %uk", ms.ullTotalPageFile >> 10); 1754 st->print("(%uk free)", ms.ullAvailPageFile >> 10); 1755 st->cr(); 1756} 1757 1758void os::print_siginfo(outputStream *st, void *siginfo) { 1759 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1760 st->print("siginfo:"); 1761 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1762 1763 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1764 er->NumberParameters >= 2) { 1765 switch (er->ExceptionInformation[0]) { 1766 case 0: st->print(", reading address"); break; 1767 case 1: st->print(", writing address"); break; 1768 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1769 er->ExceptionInformation[0]); 1770 } 1771 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1772 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1773 er->NumberParameters >= 2 && UseSharedSpaces) { 1774 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1775 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1776 st->print("\n\nError accessing class data sharing archive." \ 1777 " Mapped file inaccessible during execution, " \ 1778 " possible disk/network problem."); 1779 } 1780 } else { 1781 int num = er->NumberParameters; 1782 if (num > 0) { 1783 st->print(", ExceptionInformation="); 1784 for (int i = 0; i < num; i++) { 1785 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1786 } 1787 } 1788 } 1789 st->cr(); 1790} 1791 1792void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1793 // do nothing 1794} 1795 1796static char saved_jvm_path[MAX_PATH] = {0}; 1797 1798// Find the full path to the current module, jvm.dll 1799void os::jvm_path(char *buf, jint buflen) { 1800 // Error checking. 1801 if (buflen < MAX_PATH) { 1802 assert(false, "must use a large-enough buffer"); 1803 buf[0] = '\0'; 1804 return; 1805 } 1806 // Lazy resolve the path to current module. 1807 if (saved_jvm_path[0] != 0) { 1808 strcpy(buf, saved_jvm_path); 1809 return; 1810 } 1811 1812 buf[0] = '\0'; 1813 if (Arguments::sun_java_launcher_is_altjvm()) { 1814 // Support for the java launcher's '-XXaltjvm=<path>' option. Check 1815 // for a JAVA_HOME environment variable and fix up the path so it 1816 // looks like jvm.dll is installed there (append a fake suffix 1817 // hotspot/jvm.dll). 1818 char* java_home_var = ::getenv("JAVA_HOME"); 1819 if (java_home_var != NULL && java_home_var[0] != 0 && 1820 strlen(java_home_var) < (size_t)buflen) { 1821 strncpy(buf, java_home_var, buflen); 1822 1823 // determine if this is a legacy image or modules image 1824 // modules image doesn't have "jre" subdirectory 1825 size_t len = strlen(buf); 1826 char* jrebin_p = buf + len; 1827 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1828 if (0 != _access(buf, 0)) { 1829 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1830 } 1831 len = strlen(buf); 1832 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1833 } 1834 } 1835 1836 if (buf[0] == '\0') { 1837 GetModuleFileName(vm_lib_handle, buf, buflen); 1838 } 1839 strncpy(saved_jvm_path, buf, MAX_PATH); 1840 saved_jvm_path[MAX_PATH - 1] = '\0'; 1841} 1842 1843 1844void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1845#ifndef _WIN64 1846 st->print("_"); 1847#endif 1848} 1849 1850 1851void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1852#ifndef _WIN64 1853 st->print("@%d", args_size * sizeof(int)); 1854#endif 1855} 1856 1857// This method is a copy of JDK's sysGetLastErrorString 1858// from src/windows/hpi/src/system_md.c 1859 1860size_t os::lasterror(char* buf, size_t len) { 1861 DWORD errval; 1862 1863 if ((errval = GetLastError()) != 0) { 1864 // DOS error 1865 size_t n = (size_t)FormatMessage( 1866 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1867 NULL, 1868 errval, 1869 0, 1870 buf, 1871 (DWORD)len, 1872 NULL); 1873 if (n > 3) { 1874 // Drop final '.', CR, LF 1875 if (buf[n - 1] == '\n') n--; 1876 if (buf[n - 1] == '\r') n--; 1877 if (buf[n - 1] == '.') n--; 1878 buf[n] = '\0'; 1879 } 1880 return n; 1881 } 1882 1883 if (errno != 0) { 1884 // C runtime error that has no corresponding DOS error code 1885 const char* s = strerror(errno); 1886 size_t n = strlen(s); 1887 if (n >= len) n = len - 1; 1888 strncpy(buf, s, n); 1889 buf[n] = '\0'; 1890 return n; 1891 } 1892 1893 return 0; 1894} 1895 1896int os::get_last_error() { 1897 DWORD error = GetLastError(); 1898 if (error == 0) { 1899 error = errno; 1900 } 1901 return (int)error; 1902} 1903 1904// sun.misc.Signal 1905// NOTE that this is a workaround for an apparent kernel bug where if 1906// a signal handler for SIGBREAK is installed then that signal handler 1907// takes priority over the console control handler for CTRL_CLOSE_EVENT. 1908// See bug 4416763. 1909static void (*sigbreakHandler)(int) = NULL; 1910 1911static void UserHandler(int sig, void *siginfo, void *context) { 1912 os::signal_notify(sig); 1913 // We need to reinstate the signal handler each time... 1914 os::signal(sig, (void*)UserHandler); 1915} 1916 1917void* os::user_handler() { 1918 return (void*) UserHandler; 1919} 1920 1921void* os::signal(int signal_number, void* handler) { 1922 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1923 void (*oldHandler)(int) = sigbreakHandler; 1924 sigbreakHandler = (void (*)(int)) handler; 1925 return (void*) oldHandler; 1926 } else { 1927 return (void*)::signal(signal_number, (void (*)(int))handler); 1928 } 1929} 1930 1931void os::signal_raise(int signal_number) { 1932 raise(signal_number); 1933} 1934 1935// The Win32 C runtime library maps all console control events other than ^C 1936// into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1937// logoff, and shutdown events. We therefore install our own console handler 1938// that raises SIGTERM for the latter cases. 1939// 1940static BOOL WINAPI consoleHandler(DWORD event) { 1941 switch (event) { 1942 case CTRL_C_EVENT: 1943 if (is_error_reported()) { 1944 // Ctrl-C is pressed during error reporting, likely because the error 1945 // handler fails to abort. Let VM die immediately. 1946 os::die(); 1947 } 1948 1949 os::signal_raise(SIGINT); 1950 return TRUE; 1951 break; 1952 case CTRL_BREAK_EVENT: 1953 if (sigbreakHandler != NULL) { 1954 (*sigbreakHandler)(SIGBREAK); 1955 } 1956 return TRUE; 1957 break; 1958 case CTRL_LOGOFF_EVENT: { 1959 // Don't terminate JVM if it is running in a non-interactive session, 1960 // such as a service process. 1961 USEROBJECTFLAGS flags; 1962 HANDLE handle = GetProcessWindowStation(); 1963 if (handle != NULL && 1964 GetUserObjectInformation(handle, UOI_FLAGS, &flags, 1965 sizeof(USEROBJECTFLAGS), NULL)) { 1966 // If it is a non-interactive session, let next handler to deal 1967 // with it. 1968 if ((flags.dwFlags & WSF_VISIBLE) == 0) { 1969 return FALSE; 1970 } 1971 } 1972 } 1973 case CTRL_CLOSE_EVENT: 1974 case CTRL_SHUTDOWN_EVENT: 1975 os::signal_raise(SIGTERM); 1976 return TRUE; 1977 break; 1978 default: 1979 break; 1980 } 1981 return FALSE; 1982} 1983 1984// The following code is moved from os.cpp for making this 1985// code platform specific, which it is by its very nature. 1986 1987// Return maximum OS signal used + 1 for internal use only 1988// Used as exit signal for signal_thread 1989int os::sigexitnum_pd() { 1990 return NSIG; 1991} 1992 1993// a counter for each possible signal value, including signal_thread exit signal 1994static volatile jint pending_signals[NSIG+1] = { 0 }; 1995static HANDLE sig_sem = NULL; 1996 1997void os::signal_init_pd() { 1998 // Initialize signal structures 1999 memset((void*)pending_signals, 0, sizeof(pending_signals)); 2000 2001 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 2002 2003 // Programs embedding the VM do not want it to attempt to receive 2004 // events like CTRL_LOGOFF_EVENT, which are used to implement the 2005 // shutdown hooks mechanism introduced in 1.3. For example, when 2006 // the VM is run as part of a Windows NT service (i.e., a servlet 2007 // engine in a web server), the correct behavior is for any console 2008 // control handler to return FALSE, not TRUE, because the OS's 2009 // "final" handler for such events allows the process to continue if 2010 // it is a service (while terminating it if it is not a service). 2011 // To make this behavior uniform and the mechanism simpler, we 2012 // completely disable the VM's usage of these console events if -Xrs 2013 // (=ReduceSignalUsage) is specified. This means, for example, that 2014 // the CTRL-BREAK thread dump mechanism is also disabled in this 2015 // case. See bugs 4323062, 4345157, and related bugs. 2016 2017 if (!ReduceSignalUsage) { 2018 // Add a CTRL-C handler 2019 SetConsoleCtrlHandler(consoleHandler, TRUE); 2020 } 2021} 2022 2023void os::signal_notify(int signal_number) { 2024 BOOL ret; 2025 if (sig_sem != NULL) { 2026 Atomic::inc(&pending_signals[signal_number]); 2027 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2028 assert(ret != 0, "ReleaseSemaphore() failed"); 2029 } 2030} 2031 2032static int check_pending_signals(bool wait_for_signal) { 2033 DWORD ret; 2034 while (true) { 2035 for (int i = 0; i < NSIG + 1; i++) { 2036 jint n = pending_signals[i]; 2037 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2038 return i; 2039 } 2040 } 2041 if (!wait_for_signal) { 2042 return -1; 2043 } 2044 2045 JavaThread *thread = JavaThread::current(); 2046 2047 ThreadBlockInVM tbivm(thread); 2048 2049 bool threadIsSuspended; 2050 do { 2051 thread->set_suspend_equivalent(); 2052 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2053 ret = ::WaitForSingleObject(sig_sem, INFINITE); 2054 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 2055 2056 // were we externally suspended while we were waiting? 2057 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2058 if (threadIsSuspended) { 2059 // The semaphore has been incremented, but while we were waiting 2060 // another thread suspended us. We don't want to continue running 2061 // while suspended because that would surprise the thread that 2062 // suspended us. 2063 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2064 assert(ret != 0, "ReleaseSemaphore() failed"); 2065 2066 thread->java_suspend_self(); 2067 } 2068 } while (threadIsSuspended); 2069 } 2070} 2071 2072int os::signal_lookup() { 2073 return check_pending_signals(false); 2074} 2075 2076int os::signal_wait() { 2077 return check_pending_signals(true); 2078} 2079 2080// Implicit OS exception handling 2081 2082LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, 2083 address handler) { 2084 JavaThread* thread = JavaThread::current(); 2085 // Save pc in thread 2086#ifdef _M_IA64 2087 // Do not blow up if no thread info available. 2088 if (thread) { 2089 // Saving PRECISE pc (with slot information) in thread. 2090 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress; 2091 // Convert precise PC into "Unix" format 2092 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2); 2093 thread->set_saved_exception_pc((address)precise_pc); 2094 } 2095 // Set pc to handler 2096 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 2097 // Clear out psr.ri (= Restart Instruction) in order to continue 2098 // at the beginning of the target bundle. 2099 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF; 2100 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!"); 2101#else 2102 #ifdef _M_AMD64 2103 // Do not blow up if no thread info available. 2104 if (thread) { 2105 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip); 2106 } 2107 // Set pc to handler 2108 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 2109 #else 2110 // Do not blow up if no thread info available. 2111 if (thread) { 2112 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip); 2113 } 2114 // Set pc to handler 2115 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler; 2116 #endif 2117#endif 2118 2119 // Continue the execution 2120 return EXCEPTION_CONTINUE_EXECUTION; 2121} 2122 2123 2124// Used for PostMortemDump 2125extern "C" void safepoints(); 2126extern "C" void find(int x); 2127extern "C" void events(); 2128 2129// According to Windows API documentation, an illegal instruction sequence should generate 2130// the 0xC000001C exception code. However, real world experience shows that occasionnaly 2131// the execution of an illegal instruction can generate the exception code 0xC000001E. This 2132// seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 2133 2134#define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 2135 2136// From "Execution Protection in the Windows Operating System" draft 0.35 2137// Once a system header becomes available, the "real" define should be 2138// included or copied here. 2139#define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2140 2141// Handle NAT Bit consumption on IA64. 2142#ifdef _M_IA64 2143 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION 2144#endif 2145 2146// Windows Vista/2008 heap corruption check 2147#define EXCEPTION_HEAP_CORRUPTION 0xC0000374 2148 2149#define def_excpt(val) #val, val 2150 2151struct siglabel { 2152 char *name; 2153 int number; 2154}; 2155 2156// All Visual C++ exceptions thrown from code generated by the Microsoft Visual 2157// C++ compiler contain this error code. Because this is a compiler-generated 2158// error, the code is not listed in the Win32 API header files. 2159// The code is actually a cryptic mnemonic device, with the initial "E" 2160// standing for "exception" and the final 3 bytes (0x6D7363) representing the 2161// ASCII values of "msc". 2162 2163#define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363 2164 2165 2166struct siglabel exceptlabels[] = { 2167 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2168 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2169 def_excpt(EXCEPTION_BREAKPOINT), 2170 def_excpt(EXCEPTION_SINGLE_STEP), 2171 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2172 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2173 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2174 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2175 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2176 def_excpt(EXCEPTION_FLT_OVERFLOW), 2177 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2178 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2179 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2180 def_excpt(EXCEPTION_INT_OVERFLOW), 2181 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2182 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2183 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2184 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2185 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2186 def_excpt(EXCEPTION_STACK_OVERFLOW), 2187 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2188 def_excpt(EXCEPTION_GUARD_PAGE), 2189 def_excpt(EXCEPTION_INVALID_HANDLE), 2190 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION), 2191 def_excpt(EXCEPTION_HEAP_CORRUPTION), 2192#ifdef _M_IA64 2193 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION), 2194#endif 2195 NULL, 0 2196}; 2197 2198const char* os::exception_name(int exception_code, char *buf, size_t size) { 2199 for (int i = 0; exceptlabels[i].name != NULL; i++) { 2200 if (exceptlabels[i].number == exception_code) { 2201 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2202 return buf; 2203 } 2204 } 2205 2206 return NULL; 2207} 2208 2209//----------------------------------------------------------------------------- 2210LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2211 // handle exception caused by idiv; should only happen for -MinInt/-1 2212 // (division by zero is handled explicitly) 2213#ifdef _M_IA64 2214 assert(0, "Fix Handle_IDiv_Exception"); 2215#else 2216 #ifdef _M_AMD64 2217 PCONTEXT ctx = exceptionInfo->ContextRecord; 2218 address pc = (address)ctx->Rip; 2219 assert(pc[0] == 0xF7, "not an idiv opcode"); 2220 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2221 assert(ctx->Rax == min_jint, "unexpected idiv exception"); 2222 // set correct result values and continue after idiv instruction 2223 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2224 ctx->Rax = (DWORD)min_jint; // result 2225 ctx->Rdx = (DWORD)0; // remainder 2226 // Continue the execution 2227 #else 2228 PCONTEXT ctx = exceptionInfo->ContextRecord; 2229 address pc = (address)ctx->Eip; 2230 assert(pc[0] == 0xF7, "not an idiv opcode"); 2231 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2232 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2233 // set correct result values and continue after idiv instruction 2234 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2235 ctx->Eax = (DWORD)min_jint; // result 2236 ctx->Edx = (DWORD)0; // remainder 2237 // Continue the execution 2238 #endif 2239#endif 2240 return EXCEPTION_CONTINUE_EXECUTION; 2241} 2242 2243//----------------------------------------------------------------------------- 2244LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2245 PCONTEXT ctx = exceptionInfo->ContextRecord; 2246#ifndef _WIN64 2247 // handle exception caused by native method modifying control word 2248 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2249 2250 switch (exception_code) { 2251 case EXCEPTION_FLT_DENORMAL_OPERAND: 2252 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2253 case EXCEPTION_FLT_INEXACT_RESULT: 2254 case EXCEPTION_FLT_INVALID_OPERATION: 2255 case EXCEPTION_FLT_OVERFLOW: 2256 case EXCEPTION_FLT_STACK_CHECK: 2257 case EXCEPTION_FLT_UNDERFLOW: 2258 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2259 if (fp_control_word != ctx->FloatSave.ControlWord) { 2260 // Restore FPCW and mask out FLT exceptions 2261 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2262 // Mask out pending FLT exceptions 2263 ctx->FloatSave.StatusWord &= 0xffffff00; 2264 return EXCEPTION_CONTINUE_EXECUTION; 2265 } 2266 } 2267 2268 if (prev_uef_handler != NULL) { 2269 // We didn't handle this exception so pass it to the previous 2270 // UnhandledExceptionFilter. 2271 return (prev_uef_handler)(exceptionInfo); 2272 } 2273#else // !_WIN64 2274 // On Windows, the mxcsr control bits are non-volatile across calls 2275 // See also CR 6192333 2276 // 2277 jint MxCsr = INITIAL_MXCSR; 2278 // we can't use StubRoutines::addr_mxcsr_std() 2279 // because in Win64 mxcsr is not saved there 2280 if (MxCsr != ctx->MxCsr) { 2281 ctx->MxCsr = MxCsr; 2282 return EXCEPTION_CONTINUE_EXECUTION; 2283 } 2284#endif // !_WIN64 2285 2286 return EXCEPTION_CONTINUE_SEARCH; 2287} 2288 2289static inline void report_error(Thread* t, DWORD exception_code, 2290 address addr, void* siginfo, void* context) { 2291 VMError err(t, exception_code, addr, siginfo, context); 2292 err.report_and_die(); 2293 2294 // If UseOsErrorReporting, this will return here and save the error file 2295 // somewhere where we can find it in the minidump. 2296} 2297 2298//----------------------------------------------------------------------------- 2299LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2300 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2301 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2302#ifdef _M_IA64 2303 // On Itanium, we need the "precise pc", which has the slot number coded 2304 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format). 2305 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress; 2306 // Convert the pc to "Unix format", which has the slot number coded 2307 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2 2308 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction" 2309 // information is saved in the Unix format. 2310 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2)); 2311#else 2312 #ifdef _M_AMD64 2313 address pc = (address) exceptionInfo->ContextRecord->Rip; 2314 #else 2315 address pc = (address) exceptionInfo->ContextRecord->Eip; 2316 #endif 2317#endif 2318 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 2319 2320 // Handle SafeFetch32 and SafeFetchN exceptions. 2321 if (StubRoutines::is_safefetch_fault(pc)) { 2322 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc)); 2323 } 2324 2325#ifndef _WIN64 2326 // Execution protection violation - win32 running on AMD64 only 2327 // Handled first to avoid misdiagnosis as a "normal" access violation; 2328 // This is safe to do because we have a new/unique ExceptionInformation 2329 // code for this condition. 2330 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2331 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2332 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2333 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2334 2335 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2336 int page_size = os::vm_page_size(); 2337 2338 // Make sure the pc and the faulting address are sane. 2339 // 2340 // If an instruction spans a page boundary, and the page containing 2341 // the beginning of the instruction is executable but the following 2342 // page is not, the pc and the faulting address might be slightly 2343 // different - we still want to unguard the 2nd page in this case. 2344 // 2345 // 15 bytes seems to be a (very) safe value for max instruction size. 2346 bool pc_is_near_addr = 2347 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2348 bool instr_spans_page_boundary = 2349 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2350 (intptr_t) page_size) > 0); 2351 2352 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2353 static volatile address last_addr = 2354 (address) os::non_memory_address_word(); 2355 2356 // In conservative mode, don't unguard unless the address is in the VM 2357 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2358 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2359 2360 // Set memory to RWX and retry 2361 address page_start = 2362 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2363 bool res = os::protect_memory((char*) page_start, page_size, 2364 os::MEM_PROT_RWX); 2365 2366 if (PrintMiscellaneous && Verbose) { 2367 char buf[256]; 2368 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 2369 "at " INTPTR_FORMAT 2370 ", unguarding " INTPTR_FORMAT ": %s", addr, 2371 page_start, (res ? "success" : strerror(errno))); 2372 tty->print_raw_cr(buf); 2373 } 2374 2375 // Set last_addr so if we fault again at the same address, we don't 2376 // end up in an endless loop. 2377 // 2378 // There are two potential complications here. Two threads trapping 2379 // at the same address at the same time could cause one of the 2380 // threads to think it already unguarded, and abort the VM. Likely 2381 // very rare. 2382 // 2383 // The other race involves two threads alternately trapping at 2384 // different addresses and failing to unguard the page, resulting in 2385 // an endless loop. This condition is probably even more unlikely 2386 // than the first. 2387 // 2388 // Although both cases could be avoided by using locks or thread 2389 // local last_addr, these solutions are unnecessary complication: 2390 // this handler is a best-effort safety net, not a complete solution. 2391 // It is disabled by default and should only be used as a workaround 2392 // in case we missed any no-execute-unsafe VM code. 2393 2394 last_addr = addr; 2395 2396 return EXCEPTION_CONTINUE_EXECUTION; 2397 } 2398 } 2399 2400 // Last unguard failed or not unguarding 2401 tty->print_raw_cr("Execution protection violation"); 2402 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2403 exceptionInfo->ContextRecord); 2404 return EXCEPTION_CONTINUE_SEARCH; 2405 } 2406 } 2407#endif // _WIN64 2408 2409 // Check to see if we caught the safepoint code in the 2410 // process of write protecting the memory serialization page. 2411 // It write enables the page immediately after protecting it 2412 // so just return. 2413 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2414 JavaThread* thread = (JavaThread*) t; 2415 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2416 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2417 if (os::is_memory_serialize_page(thread, addr)) { 2418 // Block current thread until the memory serialize page permission restored. 2419 os::block_on_serialize_page_trap(); 2420 return EXCEPTION_CONTINUE_EXECUTION; 2421 } 2422 } 2423 2424 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) && 2425 VM_Version::is_cpuinfo_segv_addr(pc)) { 2426 // Verify that OS save/restore AVX registers. 2427 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr()); 2428 } 2429 2430 if (t != NULL && t->is_Java_thread()) { 2431 JavaThread* thread = (JavaThread*) t; 2432 bool in_java = thread->thread_state() == _thread_in_Java; 2433 2434 // Handle potential stack overflows up front. 2435 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2436 if (os::uses_stack_guard_pages()) { 2437#ifdef _M_IA64 2438 // Use guard page for register stack. 2439 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2440 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2441 // Check for a register stack overflow on Itanium 2442 if (thread->addr_inside_register_stack_red_zone(addr)) { 2443 // Fatal red zone violation happens if the Java program 2444 // catches a StackOverflow error and does so much processing 2445 // that it runs beyond the unprotected yellow guard zone. As 2446 // a result, we are out of here. 2447 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit."); 2448 } else if(thread->addr_inside_register_stack(addr)) { 2449 // Disable the yellow zone which sets the state that 2450 // we've got a stack overflow problem. 2451 if (thread->stack_yellow_zone_enabled()) { 2452 thread->disable_stack_yellow_zone(); 2453 } 2454 // Give us some room to process the exception. 2455 thread->disable_register_stack_guard(); 2456 // Tracing with +Verbose. 2457 if (Verbose) { 2458 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc); 2459 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr); 2460 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base()); 2461 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]", 2462 thread->register_stack_base(), 2463 thread->register_stack_base() + thread->stack_size()); 2464 } 2465 2466 // Reguard the permanent register stack red zone just to be sure. 2467 // We saw Windows silently disabling this without telling us. 2468 thread->enable_register_stack_red_zone(); 2469 2470 return Handle_Exception(exceptionInfo, 2471 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2472 } 2473#endif 2474 if (thread->stack_yellow_zone_enabled()) { 2475 // Yellow zone violation. The o/s has unprotected the first yellow 2476 // zone page for us. Note: must call disable_stack_yellow_zone to 2477 // update the enabled status, even if the zone contains only one page. 2478 thread->disable_stack_yellow_zone(); 2479 // If not in java code, return and hope for the best. 2480 return in_java 2481 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2482 : EXCEPTION_CONTINUE_EXECUTION; 2483 } else { 2484 // Fatal red zone violation. 2485 thread->disable_stack_red_zone(); 2486 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2487 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2488 exceptionInfo->ContextRecord); 2489 return EXCEPTION_CONTINUE_SEARCH; 2490 } 2491 } else if (in_java) { 2492 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2493 // a one-time-only guard page, which it has released to us. The next 2494 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2495 return Handle_Exception(exceptionInfo, 2496 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2497 } else { 2498 // Can only return and hope for the best. Further stack growth will 2499 // result in an ACCESS_VIOLATION. 2500 return EXCEPTION_CONTINUE_EXECUTION; 2501 } 2502 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2503 // Either stack overflow or null pointer exception. 2504 if (in_java) { 2505 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2506 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2507 address stack_end = thread->stack_base() - thread->stack_size(); 2508 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2509 // Stack overflow. 2510 assert(!os::uses_stack_guard_pages(), 2511 "should be caught by red zone code above."); 2512 return Handle_Exception(exceptionInfo, 2513 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2514 } 2515 // Check for safepoint polling and implicit null 2516 // We only expect null pointers in the stubs (vtable) 2517 // the rest are checked explicitly now. 2518 CodeBlob* cb = CodeCache::find_blob(pc); 2519 if (cb != NULL) { 2520 if (os::is_poll_address(addr)) { 2521 address stub = SharedRuntime::get_poll_stub(pc); 2522 return Handle_Exception(exceptionInfo, stub); 2523 } 2524 } 2525 { 2526#ifdef _WIN64 2527 // If it's a legal stack address map the entire region in 2528 // 2529 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2530 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2531 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) { 2532 addr = (address)((uintptr_t)addr & 2533 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2534 os::commit_memory((char *)addr, thread->stack_base() - addr, 2535 !ExecMem); 2536 return EXCEPTION_CONTINUE_EXECUTION; 2537 } else 2538#endif 2539 { 2540 // Null pointer exception. 2541#ifdef _M_IA64 2542 // Process implicit null checks in compiled code. Note: Implicit null checks 2543 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs. 2544 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) { 2545 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format); 2546 // Handle implicit null check in UEP method entry 2547 if (cb && (cb->is_frame_complete_at(pc) || 2548 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) { 2549 if (Verbose) { 2550 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0); 2551 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format); 2552 tty->print_cr(" to addr " INTPTR_FORMAT, addr); 2553 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)", 2554 *(bundle_start + 1), *bundle_start); 2555 } 2556 return Handle_Exception(exceptionInfo, 2557 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL)); 2558 } 2559 } 2560 2561 // Implicit null checks were processed above. Hence, we should not reach 2562 // here in the usual case => die! 2563 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception"); 2564 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2565 exceptionInfo->ContextRecord); 2566 return EXCEPTION_CONTINUE_SEARCH; 2567 2568#else // !IA64 2569 2570 // Windows 98 reports faulting addresses incorrectly 2571 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2572 !os::win32::is_nt()) { 2573 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2574 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2575 } 2576 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2577 exceptionInfo->ContextRecord); 2578 return EXCEPTION_CONTINUE_SEARCH; 2579#endif 2580 } 2581 } 2582 } 2583 2584#ifdef _WIN64 2585 // Special care for fast JNI field accessors. 2586 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2587 // in and the heap gets shrunk before the field access. 2588 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2589 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2590 if (addr != (address)-1) { 2591 return Handle_Exception(exceptionInfo, addr); 2592 } 2593 } 2594#endif 2595 2596 // Stack overflow or null pointer exception in native code. 2597 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2598 exceptionInfo->ContextRecord); 2599 return EXCEPTION_CONTINUE_SEARCH; 2600 } // /EXCEPTION_ACCESS_VIOLATION 2601 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2602#if defined _M_IA64 2603 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION || 2604 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) { 2605 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0); 2606 2607 // Compiled method patched to be non entrant? Following conditions must apply: 2608 // 1. must be first instruction in bundle 2609 // 2. must be a break instruction with appropriate code 2610 if ((((uint64_t) pc & 0x0F) == 0) && 2611 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) { 2612 return Handle_Exception(exceptionInfo, 2613 (address)SharedRuntime::get_handle_wrong_method_stub()); 2614 } 2615 } // /EXCEPTION_ILLEGAL_INSTRUCTION 2616#endif 2617 2618 2619 if (in_java) { 2620 switch (exception_code) { 2621 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2622 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2623 2624 case EXCEPTION_INT_OVERFLOW: 2625 return Handle_IDiv_Exception(exceptionInfo); 2626 2627 } // switch 2628 } 2629 if (((thread->thread_state() == _thread_in_Java) || 2630 (thread->thread_state() == _thread_in_native)) && 2631 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) { 2632 LONG result=Handle_FLT_Exception(exceptionInfo); 2633 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2634 } 2635 } 2636 2637 if (exception_code != EXCEPTION_BREAKPOINT) { 2638 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2639 exceptionInfo->ContextRecord); 2640 } 2641 return EXCEPTION_CONTINUE_SEARCH; 2642} 2643 2644#ifndef _WIN64 2645// Special care for fast JNI accessors. 2646// jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2647// the heap gets shrunk before the field access. 2648// Need to install our own structured exception handler since native code may 2649// install its own. 2650LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2651 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2652 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2653 address pc = (address) exceptionInfo->ContextRecord->Eip; 2654 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2655 if (addr != (address)-1) { 2656 return Handle_Exception(exceptionInfo, addr); 2657 } 2658 } 2659 return EXCEPTION_CONTINUE_SEARCH; 2660} 2661 2662#define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \ 2663 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \ 2664 jobject obj, \ 2665 jfieldID fieldID) { \ 2666 __try { \ 2667 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \ 2668 obj, \ 2669 fieldID); \ 2670 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \ 2671 _exception_info())) { \ 2672 } \ 2673 return 0; \ 2674 } 2675 2676DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2677DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2678DEFINE_FAST_GETFIELD(jchar, char, Char) 2679DEFINE_FAST_GETFIELD(jshort, short, Short) 2680DEFINE_FAST_GETFIELD(jint, int, Int) 2681DEFINE_FAST_GETFIELD(jlong, long, Long) 2682DEFINE_FAST_GETFIELD(jfloat, float, Float) 2683DEFINE_FAST_GETFIELD(jdouble, double, Double) 2684 2685address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2686 switch (type) { 2687 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2688 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2689 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2690 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2691 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2692 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2693 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2694 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2695 default: ShouldNotReachHere(); 2696 } 2697 return (address)-1; 2698} 2699#endif 2700 2701// Virtual Memory 2702 2703int os::vm_page_size() { return os::win32::vm_page_size(); } 2704int os::vm_allocation_granularity() { 2705 return os::win32::vm_allocation_granularity(); 2706} 2707 2708// Windows large page support is available on Windows 2003. In order to use 2709// large page memory, the administrator must first assign additional privilege 2710// to the user: 2711// + select Control Panel -> Administrative Tools -> Local Security Policy 2712// + select Local Policies -> User Rights Assignment 2713// + double click "Lock pages in memory", add users and/or groups 2714// + reboot 2715// Note the above steps are needed for administrator as well, as administrators 2716// by default do not have the privilege to lock pages in memory. 2717// 2718// Note about Windows 2003: although the API supports committing large page 2719// memory on a page-by-page basis and VirtualAlloc() returns success under this 2720// scenario, I found through experiment it only uses large page if the entire 2721// memory region is reserved and committed in a single VirtualAlloc() call. 2722// This makes Windows large page support more or less like Solaris ISM, in 2723// that the entire heap must be committed upfront. This probably will change 2724// in the future, if so the code below needs to be revisited. 2725 2726#ifndef MEM_LARGE_PAGES 2727 #define MEM_LARGE_PAGES 0x20000000 2728#endif 2729 2730static HANDLE _hProcess; 2731static HANDLE _hToken; 2732 2733// Container for NUMA node list info 2734class NUMANodeListHolder { 2735 private: 2736 int *_numa_used_node_list; // allocated below 2737 int _numa_used_node_count; 2738 2739 void free_node_list() { 2740 if (_numa_used_node_list != NULL) { 2741 FREE_C_HEAP_ARRAY(int, _numa_used_node_list); 2742 } 2743 } 2744 2745 public: 2746 NUMANodeListHolder() { 2747 _numa_used_node_count = 0; 2748 _numa_used_node_list = NULL; 2749 // do rest of initialization in build routine (after function pointers are set up) 2750 } 2751 2752 ~NUMANodeListHolder() { 2753 free_node_list(); 2754 } 2755 2756 bool build() { 2757 DWORD_PTR proc_aff_mask; 2758 DWORD_PTR sys_aff_mask; 2759 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false; 2760 ULONG highest_node_number; 2761 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false; 2762 free_node_list(); 2763 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal); 2764 for (unsigned int i = 0; i <= highest_node_number; i++) { 2765 ULONGLONG proc_mask_numa_node; 2766 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false; 2767 if ((proc_aff_mask & proc_mask_numa_node)!=0) { 2768 _numa_used_node_list[_numa_used_node_count++] = i; 2769 } 2770 } 2771 return (_numa_used_node_count > 1); 2772 } 2773 2774 int get_count() { return _numa_used_node_count; } 2775 int get_node_list_entry(int n) { 2776 // for indexes out of range, returns -1 2777 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1); 2778 } 2779 2780} numa_node_list_holder; 2781 2782 2783 2784static size_t _large_page_size = 0; 2785 2786static bool resolve_functions_for_large_page_init() { 2787 return os::Kernel32Dll::GetLargePageMinimumAvailable() && 2788 os::Advapi32Dll::AdvapiAvailable(); 2789} 2790 2791static bool request_lock_memory_privilege() { 2792 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2793 os::current_process_id()); 2794 2795 LUID luid; 2796 if (_hProcess != NULL && 2797 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2798 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2799 2800 TOKEN_PRIVILEGES tp; 2801 tp.PrivilegeCount = 1; 2802 tp.Privileges[0].Luid = luid; 2803 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2804 2805 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2806 // privilege. Check GetLastError() too. See MSDN document. 2807 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2808 (GetLastError() == ERROR_SUCCESS)) { 2809 return true; 2810 } 2811 } 2812 2813 return false; 2814} 2815 2816static void cleanup_after_large_page_init() { 2817 if (_hProcess) CloseHandle(_hProcess); 2818 _hProcess = NULL; 2819 if (_hToken) CloseHandle(_hToken); 2820 _hToken = NULL; 2821} 2822 2823static bool numa_interleaving_init() { 2824 bool success = false; 2825 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving); 2826 2827 // print a warning if UseNUMAInterleaving flag is specified on command line 2828 bool warn_on_failure = use_numa_interleaving_specified; 2829#define WARN(msg) if (warn_on_failure) { warning(msg); } 2830 2831 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages) 2832 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2833 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity); 2834 2835 if (os::Kernel32Dll::NumaCallsAvailable()) { 2836 if (numa_node_list_holder.build()) { 2837 if (PrintMiscellaneous && Verbose) { 2838 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count()); 2839 for (int i = 0; i < numa_node_list_holder.get_count(); i++) { 2840 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i)); 2841 } 2842 tty->print("\n"); 2843 } 2844 success = true; 2845 } else { 2846 WARN("Process does not cover multiple NUMA nodes."); 2847 } 2848 } else { 2849 WARN("NUMA Interleaving is not supported by the operating system."); 2850 } 2851 if (!success) { 2852 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag."); 2853 } 2854 return success; 2855#undef WARN 2856} 2857 2858// this routine is used whenever we need to reserve a contiguous VA range 2859// but we need to make separate VirtualAlloc calls for each piece of the range 2860// Reasons for doing this: 2861// * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise) 2862// * UseNUMAInterleaving requires a separate node for each piece 2863static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, 2864 DWORD prot, 2865 bool should_inject_error = false) { 2866 char * p_buf; 2867 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size 2868 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2869 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size; 2870 2871 // first reserve enough address space in advance since we want to be 2872 // able to break a single contiguous virtual address range into multiple 2873 // large page commits but WS2003 does not allow reserving large page space 2874 // so we just use 4K pages for reserve, this gives us a legal contiguous 2875 // address space. then we will deallocate that reservation, and re alloc 2876 // using large pages 2877 const size_t size_of_reserve = bytes + chunk_size; 2878 if (bytes > size_of_reserve) { 2879 // Overflowed. 2880 return NULL; 2881 } 2882 p_buf = (char *) VirtualAlloc(addr, 2883 size_of_reserve, // size of Reserve 2884 MEM_RESERVE, 2885 PAGE_READWRITE); 2886 // If reservation failed, return NULL 2887 if (p_buf == NULL) return NULL; 2888 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC); 2889 os::release_memory(p_buf, bytes + chunk_size); 2890 2891 // we still need to round up to a page boundary (in case we are using large pages) 2892 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size) 2893 // instead we handle this in the bytes_to_rq computation below 2894 p_buf = (char *) align_size_up((size_t)p_buf, page_size); 2895 2896 // now go through and allocate one chunk at a time until all bytes are 2897 // allocated 2898 size_t bytes_remaining = bytes; 2899 // An overflow of align_size_up() would have been caught above 2900 // in the calculation of size_of_reserve. 2901 char * next_alloc_addr = p_buf; 2902 HANDLE hProc = GetCurrentProcess(); 2903 2904#ifdef ASSERT 2905 // Variable for the failure injection 2906 long ran_num = os::random(); 2907 size_t fail_after = ran_num % bytes; 2908#endif 2909 2910 int count=0; 2911 while (bytes_remaining) { 2912 // select bytes_to_rq to get to the next chunk_size boundary 2913 2914 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size)); 2915 // Note allocate and commit 2916 char * p_new; 2917 2918#ifdef ASSERT 2919 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after); 2920#else 2921 const bool inject_error_now = false; 2922#endif 2923 2924 if (inject_error_now) { 2925 p_new = NULL; 2926 } else { 2927 if (!UseNUMAInterleaving) { 2928 p_new = (char *) VirtualAlloc(next_alloc_addr, 2929 bytes_to_rq, 2930 flags, 2931 prot); 2932 } else { 2933 // get the next node to use from the used_node_list 2934 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected"); 2935 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count()); 2936 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc, 2937 next_alloc_addr, 2938 bytes_to_rq, 2939 flags, 2940 prot, 2941 node); 2942 } 2943 } 2944 2945 if (p_new == NULL) { 2946 // Free any allocated pages 2947 if (next_alloc_addr > p_buf) { 2948 // Some memory was committed so release it. 2949 size_t bytes_to_release = bytes - bytes_remaining; 2950 // NMT has yet to record any individual blocks, so it 2951 // need to create a dummy 'reserve' record to match 2952 // the release. 2953 MemTracker::record_virtual_memory_reserve((address)p_buf, 2954 bytes_to_release, CALLER_PC); 2955 os::release_memory(p_buf, bytes_to_release); 2956 } 2957#ifdef ASSERT 2958 if (should_inject_error) { 2959 if (TracePageSizes && Verbose) { 2960 tty->print_cr("Reserving pages individually failed."); 2961 } 2962 } 2963#endif 2964 return NULL; 2965 } 2966 2967 bytes_remaining -= bytes_to_rq; 2968 next_alloc_addr += bytes_to_rq; 2969 count++; 2970 } 2971 // Although the memory is allocated individually, it is returned as one. 2972 // NMT records it as one block. 2973 if ((flags & MEM_COMMIT) != 0) { 2974 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC); 2975 } else { 2976 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC); 2977 } 2978 2979 // made it this far, success 2980 return p_buf; 2981} 2982 2983 2984 2985void os::large_page_init() { 2986 if (!UseLargePages) return; 2987 2988 // print a warning if any large page related flag is specified on command line 2989 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2990 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2991 bool success = false; 2992 2993#define WARN(msg) if (warn_on_failure) { warning(msg); } 2994 if (resolve_functions_for_large_page_init()) { 2995 if (request_lock_memory_privilege()) { 2996 size_t s = os::Kernel32Dll::GetLargePageMinimum(); 2997 if (s) { 2998#if defined(IA32) || defined(AMD64) 2999 if (s > 4*M || LargePageSizeInBytes > 4*M) { 3000 WARN("JVM cannot use large pages bigger than 4mb."); 3001 } else { 3002#endif 3003 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 3004 _large_page_size = LargePageSizeInBytes; 3005 } else { 3006 _large_page_size = s; 3007 } 3008 success = true; 3009#if defined(IA32) || defined(AMD64) 3010 } 3011#endif 3012 } else { 3013 WARN("Large page is not supported by the processor."); 3014 } 3015 } else { 3016 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 3017 } 3018 } else { 3019 WARN("Large page is not supported by the operating system."); 3020 } 3021#undef WARN 3022 3023 const size_t default_page_size = (size_t) vm_page_size(); 3024 if (success && _large_page_size > default_page_size) { 3025 _page_sizes[0] = _large_page_size; 3026 _page_sizes[1] = default_page_size; 3027 _page_sizes[2] = 0; 3028 } 3029 3030 cleanup_after_large_page_init(); 3031 UseLargePages = success; 3032} 3033 3034// On win32, one cannot release just a part of reserved memory, it's an 3035// all or nothing deal. When we split a reservation, we must break the 3036// reservation into two reservations. 3037void os::pd_split_reserved_memory(char *base, size_t size, size_t split, 3038 bool realloc) { 3039 if (size > 0) { 3040 release_memory(base, size); 3041 if (realloc) { 3042 reserve_memory(split, base); 3043 } 3044 if (size != split) { 3045 reserve_memory(size - split, base + split); 3046 } 3047 } 3048} 3049 3050// Multiple threads can race in this code but it's not possible to unmap small sections of 3051// virtual space to get requested alignment, like posix-like os's. 3052// Windows prevents multiple thread from remapping over each other so this loop is thread-safe. 3053char* os::reserve_memory_aligned(size_t size, size_t alignment) { 3054 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 3055 "Alignment must be a multiple of allocation granularity (page size)"); 3056 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 3057 3058 size_t extra_size = size + alignment; 3059 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 3060 3061 char* aligned_base = NULL; 3062 3063 do { 3064 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 3065 if (extra_base == NULL) { 3066 return NULL; 3067 } 3068 // Do manual alignment 3069 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 3070 3071 os::release_memory(extra_base, extra_size); 3072 3073 aligned_base = os::reserve_memory(size, aligned_base); 3074 3075 } while (aligned_base == NULL); 3076 3077 return aligned_base; 3078} 3079 3080char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 3081 assert((size_t)addr % os::vm_allocation_granularity() == 0, 3082 "reserve alignment"); 3083 assert(bytes % os::vm_page_size() == 0, "reserve page size"); 3084 char* res; 3085 // note that if UseLargePages is on, all the areas that require interleaving 3086 // will go thru reserve_memory_special rather than thru here. 3087 bool use_individual = (UseNUMAInterleaving && !UseLargePages); 3088 if (!use_individual) { 3089 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 3090 } else { 3091 elapsedTimer reserveTimer; 3092 if (Verbose && PrintMiscellaneous) reserveTimer.start(); 3093 // in numa interleaving, we have to allocate pages individually 3094 // (well really chunks of NUMAInterleaveGranularity size) 3095 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE); 3096 if (res == NULL) { 3097 warning("NUMA page allocation failed"); 3098 } 3099 if (Verbose && PrintMiscellaneous) { 3100 reserveTimer.stop(); 3101 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes, 3102 reserveTimer.milliseconds(), reserveTimer.ticks()); 3103 } 3104 } 3105 assert(res == NULL || addr == NULL || addr == res, 3106 "Unexpected address from reserve."); 3107 3108 return res; 3109} 3110 3111// Reserve memory at an arbitrary address, only if that area is 3112// available (and not reserved for something else). 3113char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3114 // Windows os::reserve_memory() fails of the requested address range is 3115 // not avilable. 3116 return reserve_memory(bytes, requested_addr); 3117} 3118 3119size_t os::large_page_size() { 3120 return _large_page_size; 3121} 3122 3123bool os::can_commit_large_page_memory() { 3124 // Windows only uses large page memory when the entire region is reserved 3125 // and committed in a single VirtualAlloc() call. This may change in the 3126 // future, but with Windows 2003 it's not possible to commit on demand. 3127 return false; 3128} 3129 3130bool os::can_execute_large_page_memory() { 3131 return true; 3132} 3133 3134char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, 3135 bool exec) { 3136 assert(UseLargePages, "only for large pages"); 3137 3138 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { 3139 return NULL; // Fallback to small pages. 3140 } 3141 3142 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 3143 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3144 3145 // with large pages, there are two cases where we need to use Individual Allocation 3146 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003) 3147 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page 3148 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) { 3149 if (TracePageSizes && Verbose) { 3150 tty->print_cr("Reserving large pages individually."); 3151 } 3152 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError); 3153 if (p_buf == NULL) { 3154 // give an appropriate warning message 3155 if (UseNUMAInterleaving) { 3156 warning("NUMA large page allocation failed, UseLargePages flag ignored"); 3157 } 3158 if (UseLargePagesIndividualAllocation) { 3159 warning("Individually allocated large pages failed, " 3160 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 3161 } 3162 return NULL; 3163 } 3164 3165 return p_buf; 3166 3167 } else { 3168 if (TracePageSizes && Verbose) { 3169 tty->print_cr("Reserving large pages in a single large chunk."); 3170 } 3171 // normal policy just allocate it all at once 3172 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3173 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); 3174 if (res != NULL) { 3175 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC); 3176 } 3177 3178 return res; 3179 } 3180} 3181 3182bool os::release_memory_special(char* base, size_t bytes) { 3183 assert(base != NULL, "Sanity check"); 3184 return release_memory(base, bytes); 3185} 3186 3187void os::print_statistics() { 3188} 3189 3190static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) { 3191 int err = os::get_last_error(); 3192 char buf[256]; 3193 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3194 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 3195 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3196 exec, buf_len != 0 ? buf : "<no_error_string>", err); 3197} 3198 3199bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 3200 if (bytes == 0) { 3201 // Don't bother the OS with noops. 3202 return true; 3203 } 3204 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 3205 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 3206 // Don't attempt to print anything if the OS call fails. We're 3207 // probably low on resources, so the print itself may cause crashes. 3208 3209 // unless we have NUMAInterleaving enabled, the range of a commit 3210 // is always within a reserve covered by a single VirtualAlloc 3211 // in that case we can just do a single commit for the requested size 3212 if (!UseNUMAInterleaving) { 3213 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) { 3214 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3215 return false; 3216 } 3217 if (exec) { 3218 DWORD oldprot; 3219 // Windows doc says to use VirtualProtect to get execute permissions 3220 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) { 3221 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3222 return false; 3223 } 3224 } 3225 return true; 3226 } else { 3227 3228 // when NUMAInterleaving is enabled, the commit might cover a range that 3229 // came from multiple VirtualAlloc reserves (using allocate_pages_individually). 3230 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery 3231 // returns represents the number of bytes that can be committed in one step. 3232 size_t bytes_remaining = bytes; 3233 char * next_alloc_addr = addr; 3234 while (bytes_remaining > 0) { 3235 MEMORY_BASIC_INFORMATION alloc_info; 3236 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info)); 3237 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3238 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, 3239 PAGE_READWRITE) == NULL) { 3240 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3241 exec);) 3242 return false; 3243 } 3244 if (exec) { 3245 DWORD oldprot; 3246 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, 3247 PAGE_EXECUTE_READWRITE, &oldprot)) { 3248 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3249 exec);) 3250 return false; 3251 } 3252 } 3253 bytes_remaining -= bytes_to_rq; 3254 next_alloc_addr += bytes_to_rq; 3255 } 3256 } 3257 // if we made it this far, return true 3258 return true; 3259} 3260 3261bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 3262 bool exec) { 3263 // alignment_hint is ignored on this OS 3264 return pd_commit_memory(addr, size, exec); 3265} 3266 3267void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 3268 const char* mesg) { 3269 assert(mesg != NULL, "mesg must be specified"); 3270 if (!pd_commit_memory(addr, size, exec)) { 3271 warn_fail_commit_memory(addr, size, exec); 3272 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); 3273 } 3274} 3275 3276void os::pd_commit_memory_or_exit(char* addr, size_t size, 3277 size_t alignment_hint, bool exec, 3278 const char* mesg) { 3279 // alignment_hint is ignored on this OS 3280 pd_commit_memory_or_exit(addr, size, exec, mesg); 3281} 3282 3283bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3284 if (bytes == 0) { 3285 // Don't bother the OS with noops. 3286 return true; 3287 } 3288 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 3289 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 3290 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0); 3291} 3292 3293bool os::pd_release_memory(char* addr, size_t bytes) { 3294 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 3295} 3296 3297bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 3298 return os::commit_memory(addr, size, !ExecMem); 3299} 3300 3301bool os::remove_stack_guard_pages(char* addr, size_t size) { 3302 return os::uncommit_memory(addr, size); 3303} 3304 3305// Set protections specified 3306bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3307 bool is_committed) { 3308 unsigned int p = 0; 3309 switch (prot) { 3310 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 3311 case MEM_PROT_READ: p = PAGE_READONLY; break; 3312 case MEM_PROT_RW: p = PAGE_READWRITE; break; 3313 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 3314 default: 3315 ShouldNotReachHere(); 3316 } 3317 3318 DWORD old_status; 3319 3320 // Strange enough, but on Win32 one can change protection only for committed 3321 // memory, not a big deal anyway, as bytes less or equal than 64K 3322 if (!is_committed) { 3323 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX, 3324 "cannot commit protection page"); 3325 } 3326 // One cannot use os::guard_memory() here, as on Win32 guard page 3327 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 3328 // 3329 // Pages in the region become guard pages. Any attempt to access a guard page 3330 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 3331 // the guard page status. Guard pages thus act as a one-time access alarm. 3332 return VirtualProtect(addr, bytes, p, &old_status) != 0; 3333} 3334 3335bool os::guard_memory(char* addr, size_t bytes) { 3336 DWORD old_status; 3337 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 3338} 3339 3340bool os::unguard_memory(char* addr, size_t bytes) { 3341 DWORD old_status; 3342 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 3343} 3344 3345void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3346void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3347void os::numa_make_global(char *addr, size_t bytes) { } 3348void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 3349bool os::numa_topology_changed() { return false; } 3350size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); } 3351int os::numa_get_group_id() { return 0; } 3352size_t os::numa_get_leaf_groups(int *ids, size_t size) { 3353 if (numa_node_list_holder.get_count() == 0 && size > 0) { 3354 // Provide an answer for UMA systems 3355 ids[0] = 0; 3356 return 1; 3357 } else { 3358 // check for size bigger than actual groups_num 3359 size = MIN2(size, numa_get_groups_num()); 3360 for (int i = 0; i < (int)size; i++) { 3361 ids[i] = numa_node_list_holder.get_node_list_entry(i); 3362 } 3363 return size; 3364 } 3365} 3366 3367bool os::get_page_info(char *start, page_info* info) { 3368 return false; 3369} 3370 3371char *os::scan_pages(char *start, char* end, page_info* page_expected, 3372 page_info* page_found) { 3373 return end; 3374} 3375 3376char* os::non_memory_address_word() { 3377 // Must never look like an address returned by reserve_memory, 3378 // even in its subfields (as defined by the CPU immediate fields, 3379 // if the CPU splits constants across multiple instructions). 3380 return (char*)-1; 3381} 3382 3383#define MAX_ERROR_COUNT 100 3384#define SYS_THREAD_ERROR 0xffffffffUL 3385 3386void os::pd_start_thread(Thread* thread) { 3387 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 3388 // Returns previous suspend state: 3389 // 0: Thread was not suspended 3390 // 1: Thread is running now 3391 // >1: Thread is still suspended. 3392 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3393} 3394 3395class HighResolutionInterval : public CHeapObj<mtThread> { 3396 // The default timer resolution seems to be 10 milliseconds. 3397 // (Where is this written down?) 3398 // If someone wants to sleep for only a fraction of the default, 3399 // then we set the timer resolution down to 1 millisecond for 3400 // the duration of their interval. 3401 // We carefully set the resolution back, since otherwise we 3402 // seem to incur an overhead (3%?) that we don't need. 3403 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 3404 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 3405 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 3406 // timeBeginPeriod() if the relative error exceeded some threshold. 3407 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 3408 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 3409 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 3410 // resolution timers running. 3411 private: 3412 jlong resolution; 3413 public: 3414 HighResolutionInterval(jlong ms) { 3415 resolution = ms % 10L; 3416 if (resolution != 0) { 3417 MMRESULT result = timeBeginPeriod(1L); 3418 } 3419 } 3420 ~HighResolutionInterval() { 3421 if (resolution != 0) { 3422 MMRESULT result = timeEndPeriod(1L); 3423 } 3424 resolution = 0L; 3425 } 3426}; 3427 3428int os::sleep(Thread* thread, jlong ms, bool interruptable) { 3429 jlong limit = (jlong) MAXDWORD; 3430 3431 while (ms > limit) { 3432 int res; 3433 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) { 3434 return res; 3435 } 3436 ms -= limit; 3437 } 3438 3439 assert(thread == Thread::current(), "thread consistency check"); 3440 OSThread* osthread = thread->osthread(); 3441 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 3442 int result; 3443 if (interruptable) { 3444 assert(thread->is_Java_thread(), "must be java thread"); 3445 JavaThread *jt = (JavaThread *) thread; 3446 ThreadBlockInVM tbivm(jt); 3447 3448 jt->set_suspend_equivalent(); 3449 // cleared by handle_special_suspend_equivalent_condition() or 3450 // java_suspend_self() via check_and_wait_while_suspended() 3451 3452 HANDLE events[1]; 3453 events[0] = osthread->interrupt_event(); 3454 HighResolutionInterval *phri=NULL; 3455 if (!ForceTimeHighResolution) { 3456 phri = new HighResolutionInterval(ms); 3457 } 3458 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 3459 result = OS_TIMEOUT; 3460 } else { 3461 ResetEvent(osthread->interrupt_event()); 3462 osthread->set_interrupted(false); 3463 result = OS_INTRPT; 3464 } 3465 delete phri; //if it is NULL, harmless 3466 3467 // were we externally suspended while we were waiting? 3468 jt->check_and_wait_while_suspended(); 3469 } else { 3470 assert(!thread->is_Java_thread(), "must not be java thread"); 3471 Sleep((long) ms); 3472 result = OS_TIMEOUT; 3473 } 3474 return result; 3475} 3476 3477// Short sleep, direct OS call. 3478// 3479// ms = 0, means allow others (if any) to run. 3480// 3481void os::naked_short_sleep(jlong ms) { 3482 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3483 Sleep(ms); 3484} 3485 3486// Sleep forever; naked call to OS-specific sleep; use with CAUTION 3487void os::infinite_sleep() { 3488 while (true) { // sleep forever ... 3489 Sleep(100000); // ... 100 seconds at a time 3490 } 3491} 3492 3493typedef BOOL (WINAPI * STTSignature)(void); 3494 3495void os::naked_yield() { 3496 // Use either SwitchToThread() or Sleep(0) 3497 // Consider passing back the return value from SwitchToThread(). 3498 if (os::Kernel32Dll::SwitchToThreadAvailable()) { 3499 SwitchToThread(); 3500 } else { 3501 Sleep(0); 3502 } 3503} 3504 3505// Win32 only gives you access to seven real priorities at a time, 3506// so we compress Java's ten down to seven. It would be better 3507// if we dynamically adjusted relative priorities. 3508 3509int os::java_to_os_priority[CriticalPriority + 1] = { 3510 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3511 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3512 THREAD_PRIORITY_LOWEST, // 2 3513 THREAD_PRIORITY_BELOW_NORMAL, // 3 3514 THREAD_PRIORITY_BELOW_NORMAL, // 4 3515 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3516 THREAD_PRIORITY_NORMAL, // 6 3517 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3518 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3519 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3520 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority 3521 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority 3522}; 3523 3524int prio_policy1[CriticalPriority + 1] = { 3525 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3526 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3527 THREAD_PRIORITY_LOWEST, // 2 3528 THREAD_PRIORITY_BELOW_NORMAL, // 3 3529 THREAD_PRIORITY_BELOW_NORMAL, // 4 3530 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3531 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3532 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3533 THREAD_PRIORITY_HIGHEST, // 8 3534 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3535 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority 3536 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority 3537}; 3538 3539static int prio_init() { 3540 // If ThreadPriorityPolicy is 1, switch tables 3541 if (ThreadPriorityPolicy == 1) { 3542 int i; 3543 for (i = 0; i < CriticalPriority + 1; i++) { 3544 os::java_to_os_priority[i] = prio_policy1[i]; 3545 } 3546 } 3547 if (UseCriticalJavaThreadPriority) { 3548 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 3549 } 3550 return 0; 3551} 3552 3553OSReturn os::set_native_priority(Thread* thread, int priority) { 3554 if (!UseThreadPriorities) return OS_OK; 3555 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3556 return ret ? OS_OK : OS_ERR; 3557} 3558 3559OSReturn os::get_native_priority(const Thread* const thread, 3560 int* priority_ptr) { 3561 if (!UseThreadPriorities) { 3562 *priority_ptr = java_to_os_priority[NormPriority]; 3563 return OS_OK; 3564 } 3565 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3566 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3567 assert(false, "GetThreadPriority failed"); 3568 return OS_ERR; 3569 } 3570 *priority_ptr = os_prio; 3571 return OS_OK; 3572} 3573 3574 3575// Hint to the underlying OS that a task switch would not be good. 3576// Void return because it's a hint and can fail. 3577void os::hint_no_preempt() {} 3578 3579void os::interrupt(Thread* thread) { 3580 assert(!thread->is_Java_thread() || Thread::current() == thread || 3581 Threads_lock->owned_by_self(), 3582 "possibility of dangling Thread pointer"); 3583 3584 OSThread* osthread = thread->osthread(); 3585 osthread->set_interrupted(true); 3586 // More than one thread can get here with the same value of osthread, 3587 // resulting in multiple notifications. We do, however, want the store 3588 // to interrupted() to be visible to other threads before we post 3589 // the interrupt event. 3590 OrderAccess::release(); 3591 SetEvent(osthread->interrupt_event()); 3592 // For JSR166: unpark after setting status 3593 if (thread->is_Java_thread()) { 3594 ((JavaThread*)thread)->parker()->unpark(); 3595 } 3596 3597 ParkEvent * ev = thread->_ParkEvent; 3598 if (ev != NULL) ev->unpark(); 3599} 3600 3601 3602bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3603 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3604 "possibility of dangling Thread pointer"); 3605 3606 OSThread* osthread = thread->osthread(); 3607 // There is no synchronization between the setting of the interrupt 3608 // and it being cleared here. It is critical - see 6535709 - that 3609 // we only clear the interrupt state, and reset the interrupt event, 3610 // if we are going to report that we were indeed interrupted - else 3611 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups 3612 // depending on the timing. By checking thread interrupt event to see 3613 // if the thread gets real interrupt thus prevent spurious wakeup. 3614 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0); 3615 if (interrupted && clear_interrupted) { 3616 osthread->set_interrupted(false); 3617 ResetEvent(osthread->interrupt_event()); 3618 } // Otherwise leave the interrupted state alone 3619 3620 return interrupted; 3621} 3622 3623// Get's a pc (hint) for a running thread. Currently used only for profiling. 3624ExtendedPC os::get_thread_pc(Thread* thread) { 3625 CONTEXT context; 3626 context.ContextFlags = CONTEXT_CONTROL; 3627 HANDLE handle = thread->osthread()->thread_handle(); 3628#ifdef _M_IA64 3629 assert(0, "Fix get_thread_pc"); 3630 return ExtendedPC(NULL); 3631#else 3632 if (GetThreadContext(handle, &context)) { 3633#ifdef _M_AMD64 3634 return ExtendedPC((address) context.Rip); 3635#else 3636 return ExtendedPC((address) context.Eip); 3637#endif 3638 } else { 3639 return ExtendedPC(NULL); 3640 } 3641#endif 3642} 3643 3644// GetCurrentThreadId() returns DWORD 3645intx os::current_thread_id() { return GetCurrentThreadId(); } 3646 3647static int _initial_pid = 0; 3648 3649int os::current_process_id() { 3650 return (_initial_pid ? _initial_pid : _getpid()); 3651} 3652 3653int os::win32::_vm_page_size = 0; 3654int os::win32::_vm_allocation_granularity = 0; 3655int os::win32::_processor_type = 0; 3656// Processor level is not available on non-NT systems, use vm_version instead 3657int os::win32::_processor_level = 0; 3658julong os::win32::_physical_memory = 0; 3659size_t os::win32::_default_stack_size = 0; 3660 3661intx os::win32::_os_thread_limit = 0; 3662volatile intx os::win32::_os_thread_count = 0; 3663 3664bool os::win32::_is_nt = false; 3665bool os::win32::_is_windows_2003 = false; 3666bool os::win32::_is_windows_server = false; 3667 3668// 6573254 3669// Currently, the bug is observed across all the supported Windows releases, 3670// including the latest one (as of this writing - Windows Server 2012 R2) 3671bool os::win32::_has_exit_bug = true; 3672bool os::win32::_has_performance_count = 0; 3673 3674void os::win32::initialize_system_info() { 3675 SYSTEM_INFO si; 3676 GetSystemInfo(&si); 3677 _vm_page_size = si.dwPageSize; 3678 _vm_allocation_granularity = si.dwAllocationGranularity; 3679 _processor_type = si.dwProcessorType; 3680 _processor_level = si.wProcessorLevel; 3681 set_processor_count(si.dwNumberOfProcessors); 3682 3683 MEMORYSTATUSEX ms; 3684 ms.dwLength = sizeof(ms); 3685 3686 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3687 // dwMemoryLoad (% of memory in use) 3688 GlobalMemoryStatusEx(&ms); 3689 _physical_memory = ms.ullTotalPhys; 3690 3691 OSVERSIONINFOEX oi; 3692 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 3693 GetVersionEx((OSVERSIONINFO*)&oi); 3694 switch (oi.dwPlatformId) { 3695 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 3696 case VER_PLATFORM_WIN32_NT: 3697 _is_nt = true; 3698 { 3699 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3700 if (os_vers == 5002) { 3701 _is_windows_2003 = true; 3702 } 3703 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER || 3704 oi.wProductType == VER_NT_SERVER) { 3705 _is_windows_server = true; 3706 } 3707 } 3708 break; 3709 default: fatal("Unknown platform"); 3710 } 3711 3712 _default_stack_size = os::current_stack_size(); 3713 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3714 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3715 "stack size not a multiple of page size"); 3716 3717 initialize_performance_counter(); 3718 3719 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is 3720 // known to deadlock the system, if the VM issues to thread operations with 3721 // a too high frequency, e.g., such as changing the priorities. 3722 // The 6000 seems to work well - no deadlocks has been notices on the test 3723 // programs that we have seen experience this problem. 3724 if (!os::win32::is_nt()) { 3725 StarvationMonitorInterval = 6000; 3726 } 3727} 3728 3729 3730HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, 3731 int ebuflen) { 3732 char path[MAX_PATH]; 3733 DWORD size; 3734 DWORD pathLen = (DWORD)sizeof(path); 3735 HINSTANCE result = NULL; 3736 3737 // only allow library name without path component 3738 assert(strchr(name, '\\') == NULL, "path not allowed"); 3739 assert(strchr(name, ':') == NULL, "path not allowed"); 3740 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) { 3741 jio_snprintf(ebuf, ebuflen, 3742 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name); 3743 return NULL; 3744 } 3745 3746 // search system directory 3747 if ((size = GetSystemDirectory(path, pathLen)) > 0) { 3748 if (size >= pathLen) { 3749 return NULL; // truncated 3750 } 3751 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3752 return NULL; // truncated 3753 } 3754 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3755 return result; 3756 } 3757 } 3758 3759 // try Windows directory 3760 if ((size = GetWindowsDirectory(path, pathLen)) > 0) { 3761 if (size >= pathLen) { 3762 return NULL; // truncated 3763 } 3764 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) { 3765 return NULL; // truncated 3766 } 3767 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3768 return result; 3769 } 3770 } 3771 3772 jio_snprintf(ebuf, ebuflen, 3773 "os::win32::load_windows_dll() cannot load %s from system directories.", name); 3774 return NULL; 3775} 3776 3777#define EXIT_TIMEOUT 300000 /* 5 minutes */ 3778 3779static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) { 3780 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect); 3781 return TRUE; 3782} 3783 3784int os::win32::exit_process_or_thread(Ept what, int exit_code) { 3785 // Basic approach: 3786 // - Each exiting thread registers its intent to exit and then does so. 3787 // - A thread trying to terminate the process must wait for all 3788 // threads currently exiting to complete their exit. 3789 3790 if (os::win32::has_exit_bug()) { 3791 // The array holds handles of the threads that have started exiting by calling 3792 // _endthreadex(). 3793 // Should be large enough to avoid blocking the exiting thread due to lack of 3794 // a free slot. 3795 static HANDLE handles[MAXIMUM_WAIT_OBJECTS]; 3796 static int handle_count = 0; 3797 3798 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT; 3799 static CRITICAL_SECTION crit_sect; 3800 static volatile jint process_exiting = 0; 3801 int i, j; 3802 DWORD res; 3803 HANDLE hproc, hthr; 3804 3805 // The first thread that reached this point, initializes the critical section. 3806 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) { 3807 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__); 3808 } else if (OrderAccess::load_acquire(&process_exiting) == 0) { 3809 EnterCriticalSection(&crit_sect); 3810 3811 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) { 3812 // Remove from the array those handles of the threads that have completed exiting. 3813 for (i = 0, j = 0; i < handle_count; ++i) { 3814 res = WaitForSingleObject(handles[i], 0 /* don't wait */); 3815 if (res == WAIT_TIMEOUT) { 3816 handles[j++] = handles[i]; 3817 } else { 3818 if (res == WAIT_FAILED) { 3819 warning("WaitForSingleObject failed (%u) in %s: %d\n", 3820 GetLastError(), __FILE__, __LINE__); 3821 } 3822 // Don't keep the handle, if we failed waiting for it. 3823 CloseHandle(handles[i]); 3824 } 3825 } 3826 3827 // If there's no free slot in the array of the kept handles, we'll have to 3828 // wait until at least one thread completes exiting. 3829 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) { 3830 // Raise the priority of the oldest exiting thread to increase its chances 3831 // to complete sooner. 3832 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL); 3833 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT); 3834 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) { 3835 i = (res - WAIT_OBJECT_0); 3836 handle_count = MAXIMUM_WAIT_OBJECTS - 1; 3837 for (; i < handle_count; ++i) { 3838 handles[i] = handles[i + 1]; 3839 } 3840 } else { 3841 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3842 (res == WAIT_FAILED ? "failed" : "timed out"), 3843 GetLastError(), __FILE__, __LINE__); 3844 // Don't keep handles, if we failed waiting for them. 3845 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) { 3846 CloseHandle(handles[i]); 3847 } 3848 handle_count = 0; 3849 } 3850 } 3851 3852 // Store a duplicate of the current thread handle in the array of handles. 3853 hproc = GetCurrentProcess(); 3854 hthr = GetCurrentThread(); 3855 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count], 3856 0, FALSE, DUPLICATE_SAME_ACCESS)) { 3857 warning("DuplicateHandle failed (%u) in %s: %d\n", 3858 GetLastError(), __FILE__, __LINE__); 3859 } else { 3860 ++handle_count; 3861 } 3862 3863 // The current exiting thread has stored its handle in the array, and now 3864 // should leave the critical section before calling _endthreadex(). 3865 3866 } else if (what != EPT_THREAD) { 3867 if (handle_count > 0) { 3868 // Before ending the process, make sure all the threads that had called 3869 // _endthreadex() completed. 3870 3871 // Set the priority level of the current thread to the same value as 3872 // the priority level of exiting threads. 3873 // This is to ensure it will be given a fair chance to execute if 3874 // the timeout expires. 3875 hthr = GetCurrentThread(); 3876 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL); 3877 for (i = 0; i < handle_count; ++i) { 3878 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL); 3879 } 3880 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT); 3881 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) { 3882 warning("WaitForMultipleObjects %s (%u) in %s: %d\n", 3883 (res == WAIT_FAILED ? "failed" : "timed out"), 3884 GetLastError(), __FILE__, __LINE__); 3885 } 3886 for (i = 0; i < handle_count; ++i) { 3887 CloseHandle(handles[i]); 3888 } 3889 handle_count = 0; 3890 } 3891 3892 OrderAccess::release_store(&process_exiting, 1); 3893 } 3894 3895 LeaveCriticalSection(&crit_sect); 3896 } 3897 3898 if (what == EPT_THREAD) { 3899 while (OrderAccess::load_acquire(&process_exiting) != 0) { 3900 // Some other thread is about to call exit(), so we 3901 // don't let the current thread proceed to _endthreadex() 3902 SuspendThread(GetCurrentThread()); 3903 // Avoid busy-wait loop, if SuspendThread() failed. 3904 Sleep(EXIT_TIMEOUT); 3905 } 3906 } 3907 } 3908 3909 // We are here if either 3910 // - there's no 'race at exit' bug on this OS release; 3911 // - initialization of the critical section failed (unlikely); 3912 // - the current thread has stored its handle and left the critical section; 3913 // - the process-exiting thread has raised the flag and left the critical section. 3914 if (what == EPT_THREAD) { 3915 _endthreadex((unsigned)exit_code); 3916 } else if (what == EPT_PROCESS) { 3917 ::exit(exit_code); 3918 } else { 3919 _exit(exit_code); 3920 } 3921 3922 // Should not reach here 3923 return exit_code; 3924} 3925 3926#undef EXIT_TIMEOUT 3927 3928void os::win32::setmode_streams() { 3929 _setmode(_fileno(stdin), _O_BINARY); 3930 _setmode(_fileno(stdout), _O_BINARY); 3931 _setmode(_fileno(stderr), _O_BINARY); 3932} 3933 3934 3935bool os::is_debugger_attached() { 3936 return IsDebuggerPresent() ? true : false; 3937} 3938 3939 3940void os::wait_for_keypress_at_exit(void) { 3941 if (PauseAtExit) { 3942 fprintf(stderr, "Press any key to continue...\n"); 3943 fgetc(stdin); 3944 } 3945} 3946 3947 3948int os::message_box(const char* title, const char* message) { 3949 int result = MessageBox(NULL, message, title, 3950 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 3951 return result == IDYES; 3952} 3953 3954int os::allocate_thread_local_storage() { 3955 return TlsAlloc(); 3956} 3957 3958 3959void os::free_thread_local_storage(int index) { 3960 TlsFree(index); 3961} 3962 3963 3964void os::thread_local_storage_at_put(int index, void* value) { 3965 TlsSetValue(index, value); 3966 assert(thread_local_storage_at(index) == value, "Just checking"); 3967} 3968 3969 3970void* os::thread_local_storage_at(int index) { 3971 return TlsGetValue(index); 3972} 3973 3974 3975#ifndef PRODUCT 3976#ifndef _WIN64 3977// Helpers to check whether NX protection is enabled 3978int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 3979 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 3980 pex->ExceptionRecord->NumberParameters > 0 && 3981 pex->ExceptionRecord->ExceptionInformation[0] == 3982 EXCEPTION_INFO_EXEC_VIOLATION) { 3983 return EXCEPTION_EXECUTE_HANDLER; 3984 } 3985 return EXCEPTION_CONTINUE_SEARCH; 3986} 3987 3988void nx_check_protection() { 3989 // If NX is enabled we'll get an exception calling into code on the stack 3990 char code[] = { (char)0xC3 }; // ret 3991 void *code_ptr = (void *)code; 3992 __try { 3993 __asm call code_ptr 3994 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 3995 tty->print_raw_cr("NX protection detected."); 3996 } 3997} 3998#endif // _WIN64 3999#endif // PRODUCT 4000 4001// this is called _before_ the global arguments have been parsed 4002void os::init(void) { 4003 _initial_pid = _getpid(); 4004 4005 init_random(1234567); 4006 4007 win32::initialize_system_info(); 4008 win32::setmode_streams(); 4009 init_page_sizes((size_t) win32::vm_page_size()); 4010 4011 // This may be overridden later when argument processing is done. 4012 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, 4013 os::win32::is_windows_2003()); 4014 4015 // Initialize main_process and main_thread 4016 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 4017 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 4018 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 4019 fatal("DuplicateHandle failed\n"); 4020 } 4021 main_thread_id = (int) GetCurrentThreadId(); 4022} 4023 4024// To install functions for atexit processing 4025extern "C" { 4026 static void perfMemory_exit_helper() { 4027 perfMemory_exit(); 4028 } 4029} 4030 4031static jint initSock(); 4032 4033// this is called _after_ the global arguments have been parsed 4034jint os::init_2(void) { 4035 // Allocate a single page and mark it as readable for safepoint polling 4036 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 4037 guarantee(polling_page != NULL, "Reserve Failed for polling page"); 4038 4039 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 4040 guarantee(return_page != NULL, "Commit Failed for polling page"); 4041 4042 os::set_polling_page(polling_page); 4043 4044#ifndef PRODUCT 4045 if (Verbose && PrintMiscellaneous) { 4046 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", 4047 (intptr_t)polling_page); 4048 } 4049#endif 4050 4051 if (!UseMembar) { 4052 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE); 4053 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 4054 4055 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE); 4056 guarantee(return_page != NULL, "Commit Failed for memory serialize page"); 4057 4058 os::set_memory_serialize_page(mem_serialize_page); 4059 4060#ifndef PRODUCT 4061 if (Verbose && PrintMiscellaneous) { 4062 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", 4063 (intptr_t)mem_serialize_page); 4064 } 4065#endif 4066 } 4067 4068 // Setup Windows Exceptions 4069 4070 // for debugging float code generation bugs 4071 if (ForceFloatExceptions) { 4072#ifndef _WIN64 4073 static long fp_control_word = 0; 4074 __asm { fstcw fp_control_word } 4075 // see Intel PPro Manual, Vol. 2, p 7-16 4076 const long precision = 0x20; 4077 const long underflow = 0x10; 4078 const long overflow = 0x08; 4079 const long zero_div = 0x04; 4080 const long denorm = 0x02; 4081 const long invalid = 0x01; 4082 fp_control_word |= invalid; 4083 __asm { fldcw fp_control_word } 4084#endif 4085 } 4086 4087 // If stack_commit_size is 0, windows will reserve the default size, 4088 // but only commit a small portion of it. 4089 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 4090 size_t default_reserve_size = os::win32::default_stack_size(); 4091 size_t actual_reserve_size = stack_commit_size; 4092 if (stack_commit_size < default_reserve_size) { 4093 // If stack_commit_size == 0, we want this too 4094 actual_reserve_size = default_reserve_size; 4095 } 4096 4097 // Check minimum allowable stack size for thread creation and to initialize 4098 // the java system classes, including StackOverflowError - depends on page 4099 // size. Add a page for compiler2 recursion in main thread. 4100 // Add in 2*BytesPerWord times page size to account for VM stack during 4101 // class initialization depending on 32 or 64 bit VM. 4102 size_t min_stack_allowed = 4103 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 4104 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size(); 4105 if (actual_reserve_size < min_stack_allowed) { 4106 tty->print_cr("\nThe stack size specified is too small, " 4107 "Specify at least %dk", 4108 min_stack_allowed / K); 4109 return JNI_ERR; 4110 } 4111 4112 JavaThread::set_stack_size_at_create(stack_commit_size); 4113 4114 // Calculate theoretical max. size of Threads to guard gainst artifical 4115 // out-of-memory situations, where all available address-space has been 4116 // reserved by thread stacks. 4117 assert(actual_reserve_size != 0, "Must have a stack"); 4118 4119 // Calculate the thread limit when we should start doing Virtual Memory 4120 // banging. Currently when the threads will have used all but 200Mb of space. 4121 // 4122 // TODO: consider performing a similar calculation for commit size instead 4123 // as reserve size, since on a 64-bit platform we'll run into that more 4124 // often than running out of virtual memory space. We can use the 4125 // lower value of the two calculations as the os_thread_limit. 4126 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 4127 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 4128 4129 // at exit methods are called in the reverse order of their registration. 4130 // there is no limit to the number of functions registered. atexit does 4131 // not set errno. 4132 4133 if (PerfAllowAtExitRegistration) { 4134 // only register atexit functions if PerfAllowAtExitRegistration is set. 4135 // atexit functions can be delayed until process exit time, which 4136 // can be problematic for embedded VM situations. Embedded VMs should 4137 // call DestroyJavaVM() to assure that VM resources are released. 4138 4139 // note: perfMemory_exit_helper atexit function may be removed in 4140 // the future if the appropriate cleanup code can be added to the 4141 // VM_Exit VMOperation's doit method. 4142 if (atexit(perfMemory_exit_helper) != 0) { 4143 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 4144 } 4145 } 4146 4147#ifndef _WIN64 4148 // Print something if NX is enabled (win32 on AMD64) 4149 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 4150#endif 4151 4152 // initialize thread priority policy 4153 prio_init(); 4154 4155 if (UseNUMA && !ForceNUMA) { 4156 UseNUMA = false; // We don't fully support this yet 4157 } 4158 4159 if (UseNUMAInterleaving) { 4160 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag 4161 bool success = numa_interleaving_init(); 4162 if (!success) UseNUMAInterleaving = false; 4163 } 4164 4165 if (initSock() != JNI_OK) { 4166 return JNI_ERR; 4167 } 4168 4169 return JNI_OK; 4170} 4171 4172// Mark the polling page as unreadable 4173void os::make_polling_page_unreadable(void) { 4174 DWORD old_status; 4175 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4176 PAGE_NOACCESS, &old_status)) { 4177 fatal("Could not disable polling page"); 4178 } 4179} 4180 4181// Mark the polling page as readable 4182void os::make_polling_page_readable(void) { 4183 DWORD old_status; 4184 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), 4185 PAGE_READONLY, &old_status)) { 4186 fatal("Could not enable polling page"); 4187 } 4188} 4189 4190 4191int os::stat(const char *path, struct stat *sbuf) { 4192 char pathbuf[MAX_PATH]; 4193 if (strlen(path) > MAX_PATH - 1) { 4194 errno = ENAMETOOLONG; 4195 return -1; 4196 } 4197 os::native_path(strcpy(pathbuf, path)); 4198 int ret = ::stat(pathbuf, sbuf); 4199 if (sbuf != NULL && UseUTCFileTimestamp) { 4200 // Fix for 6539723. st_mtime returned from stat() is dependent on 4201 // the system timezone and so can return different values for the 4202 // same file if/when daylight savings time changes. This adjustment 4203 // makes sure the same timestamp is returned regardless of the TZ. 4204 // 4205 // See: 4206 // http://msdn.microsoft.com/library/ 4207 // default.asp?url=/library/en-us/sysinfo/base/ 4208 // time_zone_information_str.asp 4209 // and 4210 // http://msdn.microsoft.com/library/default.asp?url= 4211 // /library/en-us/sysinfo/base/settimezoneinformation.asp 4212 // 4213 // NOTE: there is a insidious bug here: If the timezone is changed 4214 // after the call to stat() but before 'GetTimeZoneInformation()', then 4215 // the adjustment we do here will be wrong and we'll return the wrong 4216 // value (which will likely end up creating an invalid class data 4217 // archive). Absent a better API for this, or some time zone locking 4218 // mechanism, we'll have to live with this risk. 4219 TIME_ZONE_INFORMATION tz; 4220 DWORD tzid = GetTimeZoneInformation(&tz); 4221 int daylightBias = 4222 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 4223 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 4224 } 4225 return ret; 4226} 4227 4228 4229#define FT2INT64(ft) \ 4230 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 4231 4232 4233// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4234// are used by JVM M&M and JVMTI to get user+sys or user CPU time 4235// of a thread. 4236// 4237// current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4238// the fast estimate available on the platform. 4239 4240// current_thread_cpu_time() is not optimized for Windows yet 4241jlong os::current_thread_cpu_time() { 4242 // return user + sys since the cost is the same 4243 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 4244} 4245 4246jlong os::thread_cpu_time(Thread* thread) { 4247 // consistent with what current_thread_cpu_time() returns. 4248 return os::thread_cpu_time(thread, true /* user+sys */); 4249} 4250 4251jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4252 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4253} 4254 4255jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 4256 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 4257 // If this function changes, os::is_thread_cpu_time_supported() should too 4258 if (os::win32::is_nt()) { 4259 FILETIME CreationTime; 4260 FILETIME ExitTime; 4261 FILETIME KernelTime; 4262 FILETIME UserTime; 4263 4264 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime, 4265 &ExitTime, &KernelTime, &UserTime) == 0) { 4266 return -1; 4267 } else if (user_sys_cpu_time) { 4268 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 4269 } else { 4270 return FT2INT64(UserTime) * 100; 4271 } 4272 } else { 4273 return (jlong) timeGetTime() * 1000000; 4274 } 4275} 4276 4277void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4278 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4279 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4280 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4281 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4282} 4283 4284void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4285 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4286 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4287 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4288 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4289} 4290 4291bool os::is_thread_cpu_time_supported() { 4292 // see os::thread_cpu_time 4293 if (os::win32::is_nt()) { 4294 FILETIME CreationTime; 4295 FILETIME ExitTime; 4296 FILETIME KernelTime; 4297 FILETIME UserTime; 4298 4299 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime, 4300 &KernelTime, &UserTime) == 0) { 4301 return false; 4302 } else { 4303 return true; 4304 } 4305 } else { 4306 return false; 4307 } 4308} 4309 4310// Windows does't provide a loadavg primitive so this is stubbed out for now. 4311// It does have primitives (PDH API) to get CPU usage and run queue length. 4312// "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 4313// If we wanted to implement loadavg on Windows, we have a few options: 4314// 4315// a) Query CPU usage and run queue length and "fake" an answer by 4316// returning the CPU usage if it's under 100%, and the run queue 4317// length otherwise. It turns out that querying is pretty slow 4318// on Windows, on the order of 200 microseconds on a fast machine. 4319// Note that on the Windows the CPU usage value is the % usage 4320// since the last time the API was called (and the first call 4321// returns 100%), so we'd have to deal with that as well. 4322// 4323// b) Sample the "fake" answer using a sampling thread and store 4324// the answer in a global variable. The call to loadavg would 4325// just return the value of the global, avoiding the slow query. 4326// 4327// c) Sample a better answer using exponential decay to smooth the 4328// value. This is basically the algorithm used by UNIX kernels. 4329// 4330// Note that sampling thread starvation could affect both (b) and (c). 4331int os::loadavg(double loadavg[], int nelem) { 4332 return -1; 4333} 4334 4335 4336// DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 4337bool os::dont_yield() { 4338 return DontYieldALot; 4339} 4340 4341// This method is a slightly reworked copy of JDK's sysOpen 4342// from src/windows/hpi/src/sys_api_md.c 4343 4344int os::open(const char *path, int oflag, int mode) { 4345 char pathbuf[MAX_PATH]; 4346 4347 if (strlen(path) > MAX_PATH - 1) { 4348 errno = ENAMETOOLONG; 4349 return -1; 4350 } 4351 os::native_path(strcpy(pathbuf, path)); 4352 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 4353} 4354 4355FILE* os::open(int fd, const char* mode) { 4356 return ::_fdopen(fd, mode); 4357} 4358 4359// Is a (classpath) directory empty? 4360bool os::dir_is_empty(const char* path) { 4361 WIN32_FIND_DATA fd; 4362 HANDLE f = FindFirstFile(path, &fd); 4363 if (f == INVALID_HANDLE_VALUE) { 4364 return true; 4365 } 4366 FindClose(f); 4367 return false; 4368} 4369 4370// create binary file, rewriting existing file if required 4371int os::create_binary_file(const char* path, bool rewrite_existing) { 4372 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 4373 if (!rewrite_existing) { 4374 oflags |= _O_EXCL; 4375 } 4376 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 4377} 4378 4379// return current position of file pointer 4380jlong os::current_file_offset(int fd) { 4381 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 4382} 4383 4384// move file pointer to the specified offset 4385jlong os::seek_to_file_offset(int fd, jlong offset) { 4386 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 4387} 4388 4389 4390jlong os::lseek(int fd, jlong offset, int whence) { 4391 return (jlong) ::_lseeki64(fd, offset, whence); 4392} 4393 4394size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 4395 OVERLAPPED ov; 4396 DWORD nread; 4397 BOOL result; 4398 4399 ZeroMemory(&ov, sizeof(ov)); 4400 ov.Offset = (DWORD)offset; 4401 ov.OffsetHigh = (DWORD)(offset >> 32); 4402 4403 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4404 4405 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov); 4406 4407 return result ? nread : 0; 4408} 4409 4410 4411// This method is a slightly reworked copy of JDK's sysNativePath 4412// from src/windows/hpi/src/path_md.c 4413 4414// Convert a pathname to native format. On win32, this involves forcing all 4415// separators to be '\\' rather than '/' (both are legal inputs, but Win95 4416// sometimes rejects '/') and removing redundant separators. The input path is 4417// assumed to have been converted into the character encoding used by the local 4418// system. Because this might be a double-byte encoding, care is taken to 4419// treat double-byte lead characters correctly. 4420// 4421// This procedure modifies the given path in place, as the result is never 4422// longer than the original. There is no error return; this operation always 4423// succeeds. 4424char * os::native_path(char *path) { 4425 char *src = path, *dst = path, *end = path; 4426 char *colon = NULL; // If a drive specifier is found, this will 4427 // point to the colon following the drive letter 4428 4429 // Assumption: '/', '\\', ':', and drive letters are never lead bytes 4430 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\')) 4431 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte"); 4432 4433 // Check for leading separators 4434#define isfilesep(c) ((c) == '/' || (c) == '\\') 4435 while (isfilesep(*src)) { 4436 src++; 4437 } 4438 4439 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 4440 // Remove leading separators if followed by drive specifier. This 4441 // hack is necessary to support file URLs containing drive 4442 // specifiers (e.g., "file://c:/path"). As a side effect, 4443 // "/c:/path" can be used as an alternative to "c:/path". 4444 *dst++ = *src++; 4445 colon = dst; 4446 *dst++ = ':'; 4447 src++; 4448 } else { 4449 src = path; 4450 if (isfilesep(src[0]) && isfilesep(src[1])) { 4451 // UNC pathname: Retain first separator; leave src pointed at 4452 // second separator so that further separators will be collapsed 4453 // into the second separator. The result will be a pathname 4454 // beginning with "\\\\" followed (most likely) by a host name. 4455 src = dst = path + 1; 4456 path[0] = '\\'; // Force first separator to '\\' 4457 } 4458 } 4459 4460 end = dst; 4461 4462 // Remove redundant separators from remainder of path, forcing all 4463 // separators to be '\\' rather than '/'. Also, single byte space 4464 // characters are removed from the end of the path because those 4465 // are not legal ending characters on this operating system. 4466 // 4467 while (*src != '\0') { 4468 if (isfilesep(*src)) { 4469 *dst++ = '\\'; src++; 4470 while (isfilesep(*src)) src++; 4471 if (*src == '\0') { 4472 // Check for trailing separator 4473 end = dst; 4474 if (colon == dst - 2) break; // "z:\\" 4475 if (dst == path + 1) break; // "\\" 4476 if (dst == path + 2 && isfilesep(path[0])) { 4477 // "\\\\" is not collapsed to "\\" because "\\\\" marks the 4478 // beginning of a UNC pathname. Even though it is not, by 4479 // itself, a valid UNC pathname, we leave it as is in order 4480 // to be consistent with the path canonicalizer as well 4481 // as the win32 APIs, which treat this case as an invalid 4482 // UNC pathname rather than as an alias for the root 4483 // directory of the current drive. 4484 break; 4485 } 4486 end = --dst; // Path does not denote a root directory, so 4487 // remove trailing separator 4488 break; 4489 } 4490 end = dst; 4491 } else { 4492 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character 4493 *dst++ = *src++; 4494 if (*src) *dst++ = *src++; 4495 end = dst; 4496 } else { // Copy a single-byte character 4497 char c = *src++; 4498 *dst++ = c; 4499 // Space is not a legal ending character 4500 if (c != ' ') end = dst; 4501 } 4502 } 4503 } 4504 4505 *end = '\0'; 4506 4507 // For "z:", add "." to work around a bug in the C runtime library 4508 if (colon == dst - 1) { 4509 path[2] = '.'; 4510 path[3] = '\0'; 4511 } 4512 4513 return path; 4514} 4515 4516// This code is a copy of JDK's sysSetLength 4517// from src/windows/hpi/src/sys_api_md.c 4518 4519int os::ftruncate(int fd, jlong length) { 4520 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4521 long high = (long)(length >> 32); 4522 DWORD ret; 4523 4524 if (h == (HANDLE)(-1)) { 4525 return -1; 4526 } 4527 4528 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 4529 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 4530 return -1; 4531 } 4532 4533 if (::SetEndOfFile(h) == FALSE) { 4534 return -1; 4535 } 4536 4537 return 0; 4538} 4539 4540 4541// This code is a copy of JDK's sysSync 4542// from src/windows/hpi/src/sys_api_md.c 4543// except for the legacy workaround for a bug in Win 98 4544 4545int os::fsync(int fd) { 4546 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 4547 4548 if ((!::FlushFileBuffers(handle)) && 4549 (GetLastError() != ERROR_ACCESS_DENIED)) { 4550 // from winerror.h 4551 return -1; 4552 } 4553 return 0; 4554} 4555 4556static int nonSeekAvailable(int, long *); 4557static int stdinAvailable(int, long *); 4558 4559#define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR) 4560#define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO) 4561 4562// This code is a copy of JDK's sysAvailable 4563// from src/windows/hpi/src/sys_api_md.c 4564 4565int os::available(int fd, jlong *bytes) { 4566 jlong cur, end; 4567 struct _stati64 stbuf64; 4568 4569 if (::_fstati64(fd, &stbuf64) >= 0) { 4570 int mode = stbuf64.st_mode; 4571 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 4572 int ret; 4573 long lpbytes; 4574 if (fd == 0) { 4575 ret = stdinAvailable(fd, &lpbytes); 4576 } else { 4577 ret = nonSeekAvailable(fd, &lpbytes); 4578 } 4579 (*bytes) = (jlong)(lpbytes); 4580 return ret; 4581 } 4582 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 4583 return FALSE; 4584 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 4585 return FALSE; 4586 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 4587 return FALSE; 4588 } 4589 *bytes = end - cur; 4590 return TRUE; 4591 } else { 4592 return FALSE; 4593 } 4594} 4595 4596// This code is a copy of JDK's nonSeekAvailable 4597// from src/windows/hpi/src/sys_api_md.c 4598 4599static int nonSeekAvailable(int fd, long *pbytes) { 4600 // This is used for available on non-seekable devices 4601 // (like both named and anonymous pipes, such as pipes 4602 // connected to an exec'd process). 4603 // Standard Input is a special case. 4604 HANDLE han; 4605 4606 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 4607 return FALSE; 4608 } 4609 4610 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 4611 // PeekNamedPipe fails when at EOF. In that case we 4612 // simply make *pbytes = 0 which is consistent with the 4613 // behavior we get on Solaris when an fd is at EOF. 4614 // The only alternative is to raise an Exception, 4615 // which isn't really warranted. 4616 // 4617 if (::GetLastError() != ERROR_BROKEN_PIPE) { 4618 return FALSE; 4619 } 4620 *pbytes = 0; 4621 } 4622 return TRUE; 4623} 4624 4625#define MAX_INPUT_EVENTS 2000 4626 4627// This code is a copy of JDK's stdinAvailable 4628// from src/windows/hpi/src/sys_api_md.c 4629 4630static int stdinAvailable(int fd, long *pbytes) { 4631 HANDLE han; 4632 DWORD numEventsRead = 0; // Number of events read from buffer 4633 DWORD numEvents = 0; // Number of events in buffer 4634 DWORD i = 0; // Loop index 4635 DWORD curLength = 0; // Position marker 4636 DWORD actualLength = 0; // Number of bytes readable 4637 BOOL error = FALSE; // Error holder 4638 INPUT_RECORD *lpBuffer; // Pointer to records of input events 4639 4640 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4641 return FALSE; 4642 } 4643 4644 // Construct an array of input records in the console buffer 4645 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4646 if (error == 0) { 4647 return nonSeekAvailable(fd, pbytes); 4648 } 4649 4650 // lpBuffer must fit into 64K or else PeekConsoleInput fails 4651 if (numEvents > MAX_INPUT_EVENTS) { 4652 numEvents = MAX_INPUT_EVENTS; 4653 } 4654 4655 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal); 4656 if (lpBuffer == NULL) { 4657 return FALSE; 4658 } 4659 4660 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4661 if (error == 0) { 4662 os::free(lpBuffer); 4663 return FALSE; 4664 } 4665 4666 // Examine input records for the number of bytes available 4667 for (i=0; i<numEvents; i++) { 4668 if (lpBuffer[i].EventType == KEY_EVENT) { 4669 4670 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4671 &(lpBuffer[i].Event); 4672 if (keyRecord->bKeyDown == TRUE) { 4673 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4674 curLength++; 4675 if (*keyPressed == '\r') { 4676 actualLength = curLength; 4677 } 4678 } 4679 } 4680 } 4681 4682 if (lpBuffer != NULL) { 4683 os::free(lpBuffer); 4684 } 4685 4686 *pbytes = (long) actualLength; 4687 return TRUE; 4688} 4689 4690// Map a block of memory. 4691char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4692 char *addr, size_t bytes, bool read_only, 4693 bool allow_exec) { 4694 HANDLE hFile; 4695 char* base; 4696 4697 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4698 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4699 if (hFile == NULL) { 4700 if (PrintMiscellaneous && Verbose) { 4701 DWORD err = GetLastError(); 4702 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err); 4703 } 4704 return NULL; 4705 } 4706 4707 if (allow_exec) { 4708 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4709 // unless it comes from a PE image (which the shared archive is not.) 4710 // Even VirtualProtect refuses to give execute access to mapped memory 4711 // that was not previously executable. 4712 // 4713 // Instead, stick the executable region in anonymous memory. Yuck. 4714 // Penalty is that ~4 pages will not be shareable - in the future 4715 // we might consider DLLizing the shared archive with a proper PE 4716 // header so that mapping executable + sharing is possible. 4717 4718 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4719 PAGE_READWRITE); 4720 if (base == NULL) { 4721 if (PrintMiscellaneous && Verbose) { 4722 DWORD err = GetLastError(); 4723 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 4724 } 4725 CloseHandle(hFile); 4726 return NULL; 4727 } 4728 4729 DWORD bytes_read; 4730 OVERLAPPED overlapped; 4731 overlapped.Offset = (DWORD)file_offset; 4732 overlapped.OffsetHigh = 0; 4733 overlapped.hEvent = NULL; 4734 // ReadFile guarantees that if the return value is true, the requested 4735 // number of bytes were read before returning. 4736 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 4737 if (!res) { 4738 if (PrintMiscellaneous && Verbose) { 4739 DWORD err = GetLastError(); 4740 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 4741 } 4742 release_memory(base, bytes); 4743 CloseHandle(hFile); 4744 return NULL; 4745 } 4746 } else { 4747 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 4748 NULL /* file_name */); 4749 if (hMap == NULL) { 4750 if (PrintMiscellaneous && Verbose) { 4751 DWORD err = GetLastError(); 4752 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err); 4753 } 4754 CloseHandle(hFile); 4755 return NULL; 4756 } 4757 4758 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 4759 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 4760 (DWORD)bytes, addr); 4761 if (base == NULL) { 4762 if (PrintMiscellaneous && Verbose) { 4763 DWORD err = GetLastError(); 4764 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 4765 } 4766 CloseHandle(hMap); 4767 CloseHandle(hFile); 4768 return NULL; 4769 } 4770 4771 if (CloseHandle(hMap) == 0) { 4772 if (PrintMiscellaneous && Verbose) { 4773 DWORD err = GetLastError(); 4774 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 4775 } 4776 CloseHandle(hFile); 4777 return base; 4778 } 4779 } 4780 4781 if (allow_exec) { 4782 DWORD old_protect; 4783 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 4784 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 4785 4786 if (!res) { 4787 if (PrintMiscellaneous && Verbose) { 4788 DWORD err = GetLastError(); 4789 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 4790 } 4791 // Don't consider this a hard error, on IA32 even if the 4792 // VirtualProtect fails, we should still be able to execute 4793 CloseHandle(hFile); 4794 return base; 4795 } 4796 } 4797 4798 if (CloseHandle(hFile) == 0) { 4799 if (PrintMiscellaneous && Verbose) { 4800 DWORD err = GetLastError(); 4801 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 4802 } 4803 return base; 4804 } 4805 4806 return base; 4807} 4808 4809 4810// Remap a block of memory. 4811char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4812 char *addr, size_t bytes, bool read_only, 4813 bool allow_exec) { 4814 // This OS does not allow existing memory maps to be remapped so we 4815 // have to unmap the memory before we remap it. 4816 if (!os::unmap_memory(addr, bytes)) { 4817 return NULL; 4818 } 4819 4820 // There is a very small theoretical window between the unmap_memory() 4821 // call above and the map_memory() call below where a thread in native 4822 // code may be able to access an address that is no longer mapped. 4823 4824 return os::map_memory(fd, file_name, file_offset, addr, bytes, 4825 read_only, allow_exec); 4826} 4827 4828 4829// Unmap a block of memory. 4830// Returns true=success, otherwise false. 4831 4832bool os::pd_unmap_memory(char* addr, size_t bytes) { 4833 BOOL result = UnmapViewOfFile(addr); 4834 if (result == 0) { 4835 if (PrintMiscellaneous && Verbose) { 4836 DWORD err = GetLastError(); 4837 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 4838 } 4839 return false; 4840 } 4841 return true; 4842} 4843 4844void os::pause() { 4845 char filename[MAX_PATH]; 4846 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4847 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4848 } else { 4849 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4850 } 4851 4852 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4853 if (fd != -1) { 4854 struct stat buf; 4855 ::close(fd); 4856 while (::stat(filename, &buf) == 0) { 4857 Sleep(100); 4858 } 4859 } else { 4860 jio_fprintf(stderr, 4861 "Could not open pause file '%s', continuing immediately.\n", filename); 4862 } 4863} 4864 4865os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 4866 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 4867} 4868 4869// See the caveats for this class in os_windows.hpp 4870// Protects the callback call so that raised OS EXCEPTIONS causes a jump back 4871// into this method and returns false. If no OS EXCEPTION was raised, returns 4872// true. 4873// The callback is supposed to provide the method that should be protected. 4874// 4875bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 4876 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); 4877 assert(!WatcherThread::watcher_thread()->has_crash_protection(), 4878 "crash_protection already set?"); 4879 4880 bool success = true; 4881 __try { 4882 WatcherThread::watcher_thread()->set_crash_protection(this); 4883 cb.call(); 4884 } __except(EXCEPTION_EXECUTE_HANDLER) { 4885 // only for protection, nothing to do 4886 success = false; 4887 } 4888 WatcherThread::watcher_thread()->set_crash_protection(NULL); 4889 return success; 4890} 4891 4892// An Event wraps a win32 "CreateEvent" kernel handle. 4893// 4894// We have a number of choices regarding "CreateEvent" win32 handle leakage: 4895// 4896// 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 4897// field, and call CloseHandle() on the win32 event handle. Unpark() would 4898// need to be modified to tolerate finding a NULL (invalid) win32 event handle. 4899// In addition, an unpark() operation might fetch the handle field, but the 4900// event could recycle between the fetch and the SetEvent() operation. 4901// SetEvent() would either fail because the handle was invalid, or inadvertently work, 4902// as the win32 handle value had been recycled. In an ideal world calling SetEvent() 4903// on an stale but recycled handle would be harmless, but in practice this might 4904// confuse other non-Sun code, so it's not a viable approach. 4905// 4906// 2: Once a win32 event handle is associated with an Event, it remains associated 4907// with the Event. The event handle is never closed. This could be construed 4908// as handle leakage, but only up to the maximum # of threads that have been extant 4909// at any one time. This shouldn't be an issue, as windows platforms typically 4910// permit a process to have hundreds of thousands of open handles. 4911// 4912// 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 4913// and release unused handles. 4914// 4915// 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 4916// It's not clear, however, that we wouldn't be trading one type of leak for another. 4917// 4918// 5. Use an RCU-like mechanism (Read-Copy Update). 4919// Or perhaps something similar to Maged Michael's "Hazard pointers". 4920// 4921// We use (2). 4922// 4923// TODO-FIXME: 4924// 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 4925// 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 4926// to recover from (or at least detect) the dreaded Windows 841176 bug. 4927// 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 4928// into a single win32 CreateEvent() handle. 4929// 4930// Assumption: 4931// Only one parker can exist on an event, which is why we allocate 4932// them per-thread. Multiple unparkers can coexist. 4933// 4934// _Event transitions in park() 4935// -1 => -1 : illegal 4936// 1 => 0 : pass - return immediately 4937// 0 => -1 : block; then set _Event to 0 before returning 4938// 4939// _Event transitions in unpark() 4940// 0 => 1 : just return 4941// 1 => 1 : just return 4942// -1 => either 0 or 1; must signal target thread 4943// That is, we can safely transition _Event from -1 to either 4944// 0 or 1. 4945// 4946// _Event serves as a restricted-range semaphore. 4947// -1 : thread is blocked, i.e. there is a waiter 4948// 0 : neutral: thread is running or ready, 4949// could have been signaled after a wait started 4950// 1 : signaled - thread is running or ready 4951// 4952// Another possible encoding of _Event would be with 4953// explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 4954// 4955 4956int os::PlatformEvent::park(jlong Millis) { 4957 // Transitions for _Event: 4958 // -1 => -1 : illegal 4959 // 1 => 0 : pass - return immediately 4960 // 0 => -1 : block; then set _Event to 0 before returning 4961 4962 guarantee(_ParkHandle != NULL , "Invariant"); 4963 guarantee(Millis > 0 , "Invariant"); 4964 4965 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 4966 // the initial park() operation. 4967 // Consider: use atomic decrement instead of CAS-loop 4968 4969 int v; 4970 for (;;) { 4971 v = _Event; 4972 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4973 } 4974 guarantee((v == 0) || (v == 1), "invariant"); 4975 if (v != 0) return OS_OK; 4976 4977 // Do this the hard way by blocking ... 4978 // TODO: consider a brief spin here, gated on the success of recent 4979 // spin attempts by this thread. 4980 // 4981 // We decompose long timeouts into series of shorter timed waits. 4982 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 4983 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 4984 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 4985 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 4986 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 4987 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 4988 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 4989 // for the already waited time. This policy does not admit any new outcomes. 4990 // In the future, however, we might want to track the accumulated wait time and 4991 // adjust Millis accordingly if we encounter a spurious wakeup. 4992 4993 const int MAXTIMEOUT = 0x10000000; 4994 DWORD rv = WAIT_TIMEOUT; 4995 while (_Event < 0 && Millis > 0) { 4996 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT) 4997 if (Millis > MAXTIMEOUT) { 4998 prd = MAXTIMEOUT; 4999 } 5000 rv = ::WaitForSingleObject(_ParkHandle, prd); 5001 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed"); 5002 if (rv == WAIT_TIMEOUT) { 5003 Millis -= prd; 5004 } 5005 } 5006 v = _Event; 5007 _Event = 0; 5008 // see comment at end of os::PlatformEvent::park() below: 5009 OrderAccess::fence(); 5010 // If we encounter a nearly simultanous timeout expiry and unpark() 5011 // we return OS_OK indicating we awoke via unpark(). 5012 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 5013 return (v >= 0) ? OS_OK : OS_TIMEOUT; 5014} 5015 5016void os::PlatformEvent::park() { 5017 // Transitions for _Event: 5018 // -1 => -1 : illegal 5019 // 1 => 0 : pass - return immediately 5020 // 0 => -1 : block; then set _Event to 0 before returning 5021 5022 guarantee(_ParkHandle != NULL, "Invariant"); 5023 // Invariant: Only the thread associated with the Event/PlatformEvent 5024 // may call park(). 5025 // Consider: use atomic decrement instead of CAS-loop 5026 int v; 5027 for (;;) { 5028 v = _Event; 5029 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5030 } 5031 guarantee((v == 0) || (v == 1), "invariant"); 5032 if (v != 0) return; 5033 5034 // Do this the hard way by blocking ... 5035 // TODO: consider a brief spin here, gated on the success of recent 5036 // spin attempts by this thread. 5037 while (_Event < 0) { 5038 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE); 5039 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed"); 5040 } 5041 5042 // Usually we'll find _Event == 0 at this point, but as 5043 // an optional optimization we clear it, just in case can 5044 // multiple unpark() operations drove _Event up to 1. 5045 _Event = 0; 5046 OrderAccess::fence(); 5047 guarantee(_Event >= 0, "invariant"); 5048} 5049 5050void os::PlatformEvent::unpark() { 5051 guarantee(_ParkHandle != NULL, "Invariant"); 5052 5053 // Transitions for _Event: 5054 // 0 => 1 : just return 5055 // 1 => 1 : just return 5056 // -1 => either 0 or 1; must signal target thread 5057 // That is, we can safely transition _Event from -1 to either 5058 // 0 or 1. 5059 // See also: "Semaphores in Plan 9" by Mullender & Cox 5060 // 5061 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5062 // that it will take two back-to-back park() calls for the owning 5063 // thread to block. This has the benefit of forcing a spurious return 5064 // from the first park() call after an unpark() call which will help 5065 // shake out uses of park() and unpark() without condition variables. 5066 5067 if (Atomic::xchg(1, &_Event) >= 0) return; 5068 5069 ::SetEvent(_ParkHandle); 5070} 5071 5072 5073// JSR166 5074// ------------------------------------------------------- 5075 5076// The Windows implementation of Park is very straightforward: Basic 5077// operations on Win32 Events turn out to have the right semantics to 5078// use them directly. We opportunistically resuse the event inherited 5079// from Monitor. 5080 5081void Parker::park(bool isAbsolute, jlong time) { 5082 guarantee(_ParkEvent != NULL, "invariant"); 5083 // First, demultiplex/decode time arguments 5084 if (time < 0) { // don't wait 5085 return; 5086 } else if (time == 0 && !isAbsolute) { 5087 time = INFINITE; 5088 } else if (isAbsolute) { 5089 time -= os::javaTimeMillis(); // convert to relative time 5090 if (time <= 0) { // already elapsed 5091 return; 5092 } 5093 } else { // relative 5094 time /= 1000000; // Must coarsen from nanos to millis 5095 if (time == 0) { // Wait for the minimal time unit if zero 5096 time = 1; 5097 } 5098 } 5099 5100 JavaThread* thread = (JavaThread*)(Thread::current()); 5101 assert(thread->is_Java_thread(), "Must be JavaThread"); 5102 JavaThread *jt = (JavaThread *)thread; 5103 5104 // Don't wait if interrupted or already triggered 5105 if (Thread::is_interrupted(thread, false) || 5106 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 5107 ResetEvent(_ParkEvent); 5108 return; 5109 } else { 5110 ThreadBlockInVM tbivm(jt); 5111 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5112 jt->set_suspend_equivalent(); 5113 5114 WaitForSingleObject(_ParkEvent, time); 5115 ResetEvent(_ParkEvent); 5116 5117 // If externally suspended while waiting, re-suspend 5118 if (jt->handle_special_suspend_equivalent_condition()) { 5119 jt->java_suspend_self(); 5120 } 5121 } 5122} 5123 5124void Parker::unpark() { 5125 guarantee(_ParkEvent != NULL, "invariant"); 5126 SetEvent(_ParkEvent); 5127} 5128 5129// Run the specified command in a separate process. Return its exit value, 5130// or -1 on failure (e.g. can't create a new process). 5131int os::fork_and_exec(char* cmd) { 5132 STARTUPINFO si; 5133 PROCESS_INFORMATION pi; 5134 5135 memset(&si, 0, sizeof(si)); 5136 si.cb = sizeof(si); 5137 memset(&pi, 0, sizeof(pi)); 5138 BOOL rslt = CreateProcess(NULL, // executable name - use command line 5139 cmd, // command line 5140 NULL, // process security attribute 5141 NULL, // thread security attribute 5142 TRUE, // inherits system handles 5143 0, // no creation flags 5144 NULL, // use parent's environment block 5145 NULL, // use parent's starting directory 5146 &si, // (in) startup information 5147 &pi); // (out) process information 5148 5149 if (rslt) { 5150 // Wait until child process exits. 5151 WaitForSingleObject(pi.hProcess, INFINITE); 5152 5153 DWORD exit_code; 5154 GetExitCodeProcess(pi.hProcess, &exit_code); 5155 5156 // Close process and thread handles. 5157 CloseHandle(pi.hProcess); 5158 CloseHandle(pi.hThread); 5159 5160 return (int)exit_code; 5161 } else { 5162 return -1; 5163 } 5164} 5165 5166//-------------------------------------------------------------------------------------------------- 5167// Non-product code 5168 5169static int mallocDebugIntervalCounter = 0; 5170static int mallocDebugCounter = 0; 5171bool os::check_heap(bool force) { 5172 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 5173 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 5174 // Note: HeapValidate executes two hardware breakpoints when it finds something 5175 // wrong; at these points, eax contains the address of the offending block (I think). 5176 // To get to the exlicit error message(s) below, just continue twice. 5177 HANDLE heap = GetProcessHeap(); 5178 5179 // If we fail to lock the heap, then gflags.exe has been used 5180 // or some other special heap flag has been set that prevents 5181 // locking. We don't try to walk a heap we can't lock. 5182 if (HeapLock(heap) != 0) { 5183 PROCESS_HEAP_ENTRY phe; 5184 phe.lpData = NULL; 5185 while (HeapWalk(heap, &phe) != 0) { 5186 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 5187 !HeapValidate(heap, 0, phe.lpData)) { 5188 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 5189 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 5190 fatal("corrupted C heap"); 5191 } 5192 } 5193 DWORD err = GetLastError(); 5194 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 5195 fatal(err_msg("heap walk aborted with error %d", err)); 5196 } 5197 HeapUnlock(heap); 5198 } 5199 mallocDebugIntervalCounter = 0; 5200 } 5201 return true; 5202} 5203 5204 5205bool os::find(address addr, outputStream* st) { 5206 // Nothing yet 5207 return false; 5208} 5209 5210LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 5211 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 5212 5213 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 5214 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow(); 5215 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 5216 address addr = (address) exceptionRecord->ExceptionInformation[1]; 5217 5218 if (os::is_memory_serialize_page(thread, addr)) { 5219 return EXCEPTION_CONTINUE_EXECUTION; 5220 } 5221 } 5222 5223 return EXCEPTION_CONTINUE_SEARCH; 5224} 5225 5226// We don't build a headless jre for Windows 5227bool os::is_headless_jre() { return false; } 5228 5229static jint initSock() { 5230 WSADATA wsadata; 5231 5232 if (!os::WinSock2Dll::WinSock2Available()) { 5233 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n", 5234 ::GetLastError()); 5235 return JNI_ERR; 5236 } 5237 5238 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) { 5239 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n", 5240 ::GetLastError()); 5241 return JNI_ERR; 5242 } 5243 return JNI_OK; 5244} 5245 5246struct hostent* os::get_host_by_name(char* name) { 5247 return (struct hostent*)os::WinSock2Dll::gethostbyname(name); 5248} 5249 5250int os::socket_close(int fd) { 5251 return ::closesocket(fd); 5252} 5253 5254int os::socket(int domain, int type, int protocol) { 5255 return ::socket(domain, type, protocol); 5256} 5257 5258int os::connect(int fd, struct sockaddr* him, socklen_t len) { 5259 return ::connect(fd, him, len); 5260} 5261 5262int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5263 return ::recv(fd, buf, (int)nBytes, flags); 5264} 5265 5266int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5267 return ::send(fd, buf, (int)nBytes, flags); 5268} 5269 5270int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5271 return ::send(fd, buf, (int)nBytes, flags); 5272} 5273 5274// WINDOWS CONTEXT Flags for THREAD_SAMPLING 5275#if defined(IA32) 5276 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS) 5277#elif defined (AMD64) 5278 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT) 5279#endif 5280 5281// returns true if thread could be suspended, 5282// false otherwise 5283static bool do_suspend(HANDLE* h) { 5284 if (h != NULL) { 5285 if (SuspendThread(*h) != ~0) { 5286 return true; 5287 } 5288 } 5289 return false; 5290} 5291 5292// resume the thread 5293// calling resume on an active thread is a no-op 5294static void do_resume(HANDLE* h) { 5295 if (h != NULL) { 5296 ResumeThread(*h); 5297 } 5298} 5299 5300// retrieve a suspend/resume context capable handle 5301// from the tid. Caller validates handle return value. 5302void get_thread_handle_for_extended_context(HANDLE* h, 5303 OSThread::thread_id_t tid) { 5304 if (h != NULL) { 5305 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid); 5306 } 5307} 5308 5309// Thread sampling implementation 5310// 5311void os::SuspendedThreadTask::internal_do_task() { 5312 CONTEXT ctxt; 5313 HANDLE h = NULL; 5314 5315 // get context capable handle for thread 5316 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id()); 5317 5318 // sanity 5319 if (h == NULL || h == INVALID_HANDLE_VALUE) { 5320 return; 5321 } 5322 5323 // suspend the thread 5324 if (do_suspend(&h)) { 5325 ctxt.ContextFlags = sampling_context_flags; 5326 // get thread context 5327 GetThreadContext(h, &ctxt); 5328 SuspendedThreadTaskContext context(_thread, &ctxt); 5329 // pass context to Thread Sampling impl 5330 do_task(context); 5331 // resume thread 5332 do_resume(&h); 5333 } 5334 5335 // close handle 5336 CloseHandle(h); 5337} 5338 5339 5340// Kernel32 API 5341typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void); 5342typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD); 5343typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG); 5344typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG); 5345typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG); 5346 5347GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL; 5348VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL; 5349GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL; 5350GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL; 5351RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL; 5352 5353 5354BOOL os::Kernel32Dll::initialized = FALSE; 5355SIZE_T os::Kernel32Dll::GetLargePageMinimum() { 5356 assert(initialized && _GetLargePageMinimum != NULL, 5357 "GetLargePageMinimumAvailable() not yet called"); 5358 return _GetLargePageMinimum(); 5359} 5360 5361BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() { 5362 if (!initialized) { 5363 initialize(); 5364 } 5365 return _GetLargePageMinimum != NULL; 5366} 5367 5368BOOL os::Kernel32Dll::NumaCallsAvailable() { 5369 if (!initialized) { 5370 initialize(); 5371 } 5372 return _VirtualAllocExNuma != NULL; 5373} 5374 5375LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, 5376 SIZE_T bytes, DWORD flags, 5377 DWORD prot, DWORD node) { 5378 assert(initialized && _VirtualAllocExNuma != NULL, 5379 "NUMACallsAvailable() not yet called"); 5380 5381 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node); 5382} 5383 5384BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) { 5385 assert(initialized && _GetNumaHighestNodeNumber != NULL, 5386 "NUMACallsAvailable() not yet called"); 5387 5388 return _GetNumaHighestNodeNumber(ptr_highest_node_number); 5389} 5390 5391BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, 5392 PULONGLONG proc_mask) { 5393 assert(initialized && _GetNumaNodeProcessorMask != NULL, 5394 "NUMACallsAvailable() not yet called"); 5395 5396 return _GetNumaNodeProcessorMask(node, proc_mask); 5397} 5398 5399USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip, 5400 ULONG FrameToCapture, 5401 PVOID* BackTrace, 5402 PULONG BackTraceHash) { 5403 if (!initialized) { 5404 initialize(); 5405 } 5406 5407 if (_RtlCaptureStackBackTrace != NULL) { 5408 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture, 5409 BackTrace, BackTraceHash); 5410 } else { 5411 return 0; 5412 } 5413} 5414 5415void os::Kernel32Dll::initializeCommon() { 5416 if (!initialized) { 5417 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5418 assert(handle != NULL, "Just check"); 5419 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum"); 5420 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma"); 5421 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber"); 5422 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask"); 5423 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace"); 5424 initialized = TRUE; 5425 } 5426} 5427 5428 5429 5430#ifndef JDK6_OR_EARLIER 5431 5432void os::Kernel32Dll::initialize() { 5433 initializeCommon(); 5434} 5435 5436 5437// Kernel32 API 5438inline BOOL os::Kernel32Dll::SwitchToThread() { 5439 return ::SwitchToThread(); 5440} 5441 5442inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5443 return true; 5444} 5445 5446// Help tools 5447inline BOOL os::Kernel32Dll::HelpToolsAvailable() { 5448 return true; 5449} 5450 5451inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5452 DWORD th32ProcessId) { 5453 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5454} 5455 5456inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot, 5457 LPMODULEENTRY32 lpme) { 5458 return ::Module32First(hSnapshot, lpme); 5459} 5460 5461inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5462 LPMODULEENTRY32 lpme) { 5463 return ::Module32Next(hSnapshot, lpme); 5464} 5465 5466inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5467 ::GetNativeSystemInfo(lpSystemInfo); 5468} 5469 5470// PSAPI API 5471inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, 5472 HMODULE *lpModule, DWORD cb, 5473 LPDWORD lpcbNeeded) { 5474 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5475} 5476 5477inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, 5478 HMODULE hModule, 5479 LPTSTR lpFilename, 5480 DWORD nSize) { 5481 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5482} 5483 5484inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, 5485 HMODULE hModule, 5486 LPMODULEINFO lpmodinfo, 5487 DWORD cb) { 5488 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5489} 5490 5491inline BOOL os::PSApiDll::PSApiAvailable() { 5492 return true; 5493} 5494 5495 5496// WinSock2 API 5497inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, 5498 LPWSADATA lpWSAData) { 5499 return ::WSAStartup(wVersionRequested, lpWSAData); 5500} 5501 5502inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5503 return ::gethostbyname(name); 5504} 5505 5506inline BOOL os::WinSock2Dll::WinSock2Available() { 5507 return true; 5508} 5509 5510// Advapi API 5511inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5512 BOOL DisableAllPrivileges, 5513 PTOKEN_PRIVILEGES NewState, 5514 DWORD BufferLength, 5515 PTOKEN_PRIVILEGES PreviousState, 5516 PDWORD ReturnLength) { 5517 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5518 BufferLength, PreviousState, ReturnLength); 5519} 5520 5521inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5522 DWORD DesiredAccess, 5523 PHANDLE TokenHandle) { 5524 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5525} 5526 5527inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5528 LPCTSTR lpName, 5529 PLUID lpLuid) { 5530 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5531} 5532 5533inline BOOL os::Advapi32Dll::AdvapiAvailable() { 5534 return true; 5535} 5536 5537void* os::get_default_process_handle() { 5538 return (void*)GetModuleHandle(NULL); 5539} 5540 5541// Builds a platform dependent Agent_OnLoad_<lib_name> function name 5542// which is used to find statically linked in agents. 5543// Additionally for windows, takes into account __stdcall names. 5544// Parameters: 5545// sym_name: Symbol in library we are looking for 5546// lib_name: Name of library to look in, NULL for shared libs. 5547// is_absolute_path == true if lib_name is absolute path to agent 5548// such as "C:/a/b/L.dll" 5549// == false if only the base name of the library is passed in 5550// such as "L" 5551char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 5552 bool is_absolute_path) { 5553 char *agent_entry_name; 5554 size_t len; 5555 size_t name_len; 5556 size_t prefix_len = strlen(JNI_LIB_PREFIX); 5557 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 5558 const char *start; 5559 5560 if (lib_name != NULL) { 5561 len = name_len = strlen(lib_name); 5562 if (is_absolute_path) { 5563 // Need to strip path, prefix and suffix 5564 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 5565 lib_name = ++start; 5566 } else { 5567 // Need to check for drive prefix 5568 if ((start = strchr(lib_name, ':')) != NULL) { 5569 lib_name = ++start; 5570 } 5571 } 5572 if (len <= (prefix_len + suffix_len)) { 5573 return NULL; 5574 } 5575 lib_name += prefix_len; 5576 name_len = strlen(lib_name) - suffix_len; 5577 } 5578 } 5579 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 5580 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 5581 if (agent_entry_name == NULL) { 5582 return NULL; 5583 } 5584 if (lib_name != NULL) { 5585 const char *p = strrchr(sym_name, '@'); 5586 if (p != NULL && p != sym_name) { 5587 // sym_name == _Agent_OnLoad@XX 5588 strncpy(agent_entry_name, sym_name, (p - sym_name)); 5589 agent_entry_name[(p-sym_name)] = '\0'; 5590 // agent_entry_name == _Agent_OnLoad 5591 strcat(agent_entry_name, "_"); 5592 strncat(agent_entry_name, lib_name, name_len); 5593 strcat(agent_entry_name, p); 5594 // agent_entry_name == _Agent_OnLoad_lib_name@XX 5595 } else { 5596 strcpy(agent_entry_name, sym_name); 5597 strcat(agent_entry_name, "_"); 5598 strncat(agent_entry_name, lib_name, name_len); 5599 } 5600 } else { 5601 strcpy(agent_entry_name, sym_name); 5602 } 5603 return agent_entry_name; 5604} 5605 5606#else 5607// Kernel32 API 5608typedef BOOL (WINAPI* SwitchToThread_Fn)(void); 5609typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD); 5610typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32); 5611typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32); 5612typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO); 5613 5614SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL; 5615CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL; 5616Module32First_Fn os::Kernel32Dll::_Module32First = NULL; 5617Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL; 5618GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL; 5619 5620void os::Kernel32Dll::initialize() { 5621 if (!initialized) { 5622 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5623 assert(handle != NULL, "Just check"); 5624 5625 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread"); 5626 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn) 5627 ::GetProcAddress(handle, "CreateToolhelp32Snapshot"); 5628 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First"); 5629 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next"); 5630 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo"); 5631 initializeCommon(); // resolve the functions that always need resolving 5632 5633 initialized = TRUE; 5634 } 5635} 5636 5637BOOL os::Kernel32Dll::SwitchToThread() { 5638 assert(initialized && _SwitchToThread != NULL, 5639 "SwitchToThreadAvailable() not yet called"); 5640 return _SwitchToThread(); 5641} 5642 5643 5644BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5645 if (!initialized) { 5646 initialize(); 5647 } 5648 return _SwitchToThread != NULL; 5649} 5650 5651// Help tools 5652BOOL os::Kernel32Dll::HelpToolsAvailable() { 5653 if (!initialized) { 5654 initialize(); 5655 } 5656 return _CreateToolhelp32Snapshot != NULL && 5657 _Module32First != NULL && 5658 _Module32Next != NULL; 5659} 5660 5661HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags, 5662 DWORD th32ProcessId) { 5663 assert(initialized && _CreateToolhelp32Snapshot != NULL, 5664 "HelpToolsAvailable() not yet called"); 5665 5666 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5667} 5668 5669BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5670 assert(initialized && _Module32First != NULL, 5671 "HelpToolsAvailable() not yet called"); 5672 5673 return _Module32First(hSnapshot, lpme); 5674} 5675 5676inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot, 5677 LPMODULEENTRY32 lpme) { 5678 assert(initialized && _Module32Next != NULL, 5679 "HelpToolsAvailable() not yet called"); 5680 5681 return _Module32Next(hSnapshot, lpme); 5682} 5683 5684 5685BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() { 5686 if (!initialized) { 5687 initialize(); 5688 } 5689 return _GetNativeSystemInfo != NULL; 5690} 5691 5692void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5693 assert(initialized && _GetNativeSystemInfo != NULL, 5694 "GetNativeSystemInfoAvailable() not yet called"); 5695 5696 _GetNativeSystemInfo(lpSystemInfo); 5697} 5698 5699// PSAPI API 5700 5701 5702typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD); 5703typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD); 5704typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD); 5705 5706EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL; 5707GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL; 5708GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL; 5709BOOL os::PSApiDll::initialized = FALSE; 5710 5711void os::PSApiDll::initialize() { 5712 if (!initialized) { 5713 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0); 5714 if (handle != NULL) { 5715 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle, 5716 "EnumProcessModules"); 5717 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle, 5718 "GetModuleFileNameExA"); 5719 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle, 5720 "GetModuleInformation"); 5721 } 5722 initialized = TRUE; 5723 } 5724} 5725 5726 5727 5728BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, 5729 DWORD cb, LPDWORD lpcbNeeded) { 5730 assert(initialized && _EnumProcessModules != NULL, 5731 "PSApiAvailable() not yet called"); 5732 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5733} 5734 5735DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, 5736 LPTSTR lpFilename, DWORD nSize) { 5737 assert(initialized && _GetModuleFileNameEx != NULL, 5738 "PSApiAvailable() not yet called"); 5739 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5740} 5741 5742BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, 5743 LPMODULEINFO lpmodinfo, DWORD cb) { 5744 assert(initialized && _GetModuleInformation != NULL, 5745 "PSApiAvailable() not yet called"); 5746 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5747} 5748 5749BOOL os::PSApiDll::PSApiAvailable() { 5750 if (!initialized) { 5751 initialize(); 5752 } 5753 return _EnumProcessModules != NULL && 5754 _GetModuleFileNameEx != NULL && 5755 _GetModuleInformation != NULL; 5756} 5757 5758 5759// WinSock2 API 5760typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA); 5761typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...); 5762 5763WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL; 5764gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL; 5765BOOL os::WinSock2Dll::initialized = FALSE; 5766 5767void os::WinSock2Dll::initialize() { 5768 if (!initialized) { 5769 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0); 5770 if (handle != NULL) { 5771 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup"); 5772 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname"); 5773 } 5774 initialized = TRUE; 5775 } 5776} 5777 5778 5779BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) { 5780 assert(initialized && _WSAStartup != NULL, 5781 "WinSock2Available() not yet called"); 5782 return _WSAStartup(wVersionRequested, lpWSAData); 5783} 5784 5785struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5786 assert(initialized && _gethostbyname != NULL, 5787 "WinSock2Available() not yet called"); 5788 return _gethostbyname(name); 5789} 5790 5791BOOL os::WinSock2Dll::WinSock2Available() { 5792 if (!initialized) { 5793 initialize(); 5794 } 5795 return _WSAStartup != NULL && 5796 _gethostbyname != NULL; 5797} 5798 5799typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 5800typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE); 5801typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID); 5802 5803AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL; 5804OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL; 5805LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL; 5806BOOL os::Advapi32Dll::initialized = FALSE; 5807 5808void os::Advapi32Dll::initialize() { 5809 if (!initialized) { 5810 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0); 5811 if (handle != NULL) { 5812 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle, 5813 "AdjustTokenPrivileges"); 5814 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle, 5815 "OpenProcessToken"); 5816 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle, 5817 "LookupPrivilegeValueA"); 5818 } 5819 initialized = TRUE; 5820 } 5821} 5822 5823BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5824 BOOL DisableAllPrivileges, 5825 PTOKEN_PRIVILEGES NewState, 5826 DWORD BufferLength, 5827 PTOKEN_PRIVILEGES PreviousState, 5828 PDWORD ReturnLength) { 5829 assert(initialized && _AdjustTokenPrivileges != NULL, 5830 "AdvapiAvailable() not yet called"); 5831 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5832 BufferLength, PreviousState, ReturnLength); 5833} 5834 5835BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, 5836 DWORD DesiredAccess, 5837 PHANDLE TokenHandle) { 5838 assert(initialized && _OpenProcessToken != NULL, 5839 "AdvapiAvailable() not yet called"); 5840 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5841} 5842 5843BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, 5844 LPCTSTR lpName, PLUID lpLuid) { 5845 assert(initialized && _LookupPrivilegeValue != NULL, 5846 "AdvapiAvailable() not yet called"); 5847 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5848} 5849 5850BOOL os::Advapi32Dll::AdvapiAvailable() { 5851 if (!initialized) { 5852 initialize(); 5853 } 5854 return _AdjustTokenPrivileges != NULL && 5855 _OpenProcessToken != NULL && 5856 _LookupPrivilegeValue != NULL; 5857} 5858 5859#endif 5860 5861#ifndef PRODUCT 5862 5863// test the code path in reserve_memory_special() that tries to allocate memory in a single 5864// contiguous memory block at a particular address. 5865// The test first tries to find a good approximate address to allocate at by using the same 5866// method to allocate some memory at any address. The test then tries to allocate memory in 5867// the vicinity (not directly after it to avoid possible by-chance use of that location) 5868// This is of course only some dodgy assumption, there is no guarantee that the vicinity of 5869// the previously allocated memory is available for allocation. The only actual failure 5870// that is reported is when the test tries to allocate at a particular location but gets a 5871// different valid one. A NULL return value at this point is not considered an error but may 5872// be legitimate. 5873// If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages. 5874void TestReserveMemorySpecial_test() { 5875 if (!UseLargePages) { 5876 if (VerboseInternalVMTests) { 5877 gclog_or_tty->print("Skipping test because large pages are disabled"); 5878 } 5879 return; 5880 } 5881 // save current value of globals 5882 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; 5883 bool old_use_numa_interleaving = UseNUMAInterleaving; 5884 5885 // set globals to make sure we hit the correct code path 5886 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; 5887 5888 // do an allocation at an address selected by the OS to get a good one. 5889 const size_t large_allocation_size = os::large_page_size() * 4; 5890 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); 5891 if (result == NULL) { 5892 if (VerboseInternalVMTests) { 5893 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.", 5894 large_allocation_size); 5895 } 5896 } else { 5897 os::release_memory_special(result, large_allocation_size); 5898 5899 // allocate another page within the recently allocated memory area which seems to be a good location. At least 5900 // we managed to get it once. 5901 const size_t expected_allocation_size = os::large_page_size(); 5902 char* expected_location = result + os::large_page_size(); 5903 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); 5904 if (actual_location == NULL) { 5905 if (VerboseInternalVMTests) { 5906 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.", 5907 expected_location, large_allocation_size); 5908 } 5909 } else { 5910 // release memory 5911 os::release_memory_special(actual_location, expected_allocation_size); 5912 // only now check, after releasing any memory to avoid any leaks. 5913 assert(actual_location == expected_location, 5914 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead", 5915 expected_location, expected_allocation_size, actual_location)); 5916 } 5917 } 5918 5919 // restore globals 5920 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; 5921 UseNUMAInterleaving = old_use_numa_interleaving; 5922} 5923#endif // PRODUCT 5924