os_windows.cpp revision 1892:cb2d0a362639
1/* 2 * Copyright (c) 1997, 2010, 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#ifdef _WIN64 26// Must be at least Windows 2000 or XP to use VectoredExceptions 27#define _WIN32_WINNT 0x500 28#endif 29 30// no precompiled headers 31#include "classfile/classLoader.hpp" 32#include "classfile/systemDictionary.hpp" 33#include "classfile/vmSymbols.hpp" 34#include "code/icBuffer.hpp" 35#include "code/vtableStubs.hpp" 36#include "compiler/compileBroker.hpp" 37#include "interpreter/interpreter.hpp" 38#include "jvm_windows.h" 39#include "memory/allocation.inline.hpp" 40#include "memory/filemap.hpp" 41#include "mutex_windows.inline.hpp" 42#include "oops/oop.inline.hpp" 43#include "os_share_windows.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/extendedPC.hpp" 49#include "runtime/globals.hpp" 50#include "runtime/interfaceSupport.hpp" 51#include "runtime/java.hpp" 52#include "runtime/javaCalls.hpp" 53#include "runtime/mutexLocker.hpp" 54#include "runtime/objectMonitor.hpp" 55#include "runtime/osThread.hpp" 56#include "runtime/perfMemory.hpp" 57#include "runtime/sharedRuntime.hpp" 58#include "runtime/statSampler.hpp" 59#include "runtime/stubRoutines.hpp" 60#include "runtime/threadCritical.hpp" 61#include "runtime/timer.hpp" 62#include "services/attachListener.hpp" 63#include "services/runtimeService.hpp" 64#include "thread_windows.inline.hpp" 65#include "utilities/defaultStream.hpp" 66#include "utilities/events.hpp" 67#include "utilities/growableArray.hpp" 68#include "utilities/vmError.hpp" 69#ifdef TARGET_ARCH_x86 70# include "assembler_x86.inline.hpp" 71# include "nativeInst_x86.hpp" 72#endif 73#ifdef COMPILER1 74#include "c1/c1_Runtime1.hpp" 75#endif 76#ifdef COMPILER2 77#include "opto/runtime.hpp" 78#endif 79 80#ifdef _DEBUG 81#include <crtdbg.h> 82#endif 83 84 85#include <windows.h> 86#include <sys/types.h> 87#include <sys/stat.h> 88#include <sys/timeb.h> 89#include <objidl.h> 90#include <shlobj.h> 91 92#include <malloc.h> 93#include <signal.h> 94#include <direct.h> 95#include <errno.h> 96#include <fcntl.h> 97#include <io.h> 98#include <process.h> // For _beginthreadex(), _endthreadex() 99#include <imagehlp.h> // For os::dll_address_to_function_name 100 101/* for enumerating dll libraries */ 102#include <tlhelp32.h> 103#include <vdmdbg.h> 104 105// for timer info max values which include all bits 106#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 107 108// For DLL loading/load error detection 109// Values of PE COFF 110#define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c 111#define IMAGE_FILE_SIGNATURE_LENGTH 4 112 113static HANDLE main_process; 114static HANDLE main_thread; 115static int main_thread_id; 116 117static FILETIME process_creation_time; 118static FILETIME process_exit_time; 119static FILETIME process_user_time; 120static FILETIME process_kernel_time; 121 122#ifdef _WIN64 123PVOID topLevelVectoredExceptionHandler = NULL; 124#endif 125 126#ifdef _M_IA64 127#define __CPU__ ia64 128#elif _M_AMD64 129#define __CPU__ amd64 130#else 131#define __CPU__ i486 132#endif 133 134// save DLL module handle, used by GetModuleFileName 135 136HINSTANCE vm_lib_handle; 137static int getLastErrorString(char *buf, size_t len); 138 139BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { 140 switch (reason) { 141 case DLL_PROCESS_ATTACH: 142 vm_lib_handle = hinst; 143 if(ForceTimeHighResolution) 144 timeBeginPeriod(1L); 145 break; 146 case DLL_PROCESS_DETACH: 147 if(ForceTimeHighResolution) 148 timeEndPeriod(1L); 149#ifdef _WIN64 150 if (topLevelVectoredExceptionHandler != NULL) { 151 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler); 152 topLevelVectoredExceptionHandler = NULL; 153 } 154#endif 155 break; 156 default: 157 break; 158 } 159 return true; 160} 161 162static inline double fileTimeAsDouble(FILETIME* time) { 163 const double high = (double) ((unsigned int) ~0); 164 const double split = 10000000.0; 165 double result = (time->dwLowDateTime / split) + 166 time->dwHighDateTime * (high/split); 167 return result; 168} 169 170// Implementation of os 171 172bool os::getenv(const char* name, char* buffer, int len) { 173 int result = GetEnvironmentVariable(name, buffer, len); 174 return result > 0 && result < len; 175} 176 177 178// No setuid programs under Windows. 179bool os::have_special_privileges() { 180 return false; 181} 182 183 184// This method is a periodic task to check for misbehaving JNI applications 185// under CheckJNI, we can add any periodic checks here. 186// For Windows at the moment does nothing 187void os::run_periodic_checks() { 188 return; 189} 190 191#ifndef _WIN64 192// previous UnhandledExceptionFilter, if there is one 193static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL; 194 195LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 196#endif 197void os::init_system_properties_values() { 198 /* sysclasspath, java_home, dll_dir */ 199 { 200 char *home_path; 201 char *dll_path; 202 char *pslash; 203 char *bin = "\\bin"; 204 char home_dir[MAX_PATH]; 205 206 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) { 207 os::jvm_path(home_dir, sizeof(home_dir)); 208 // Found the full path to jvm[_g].dll. 209 // Now cut the path to <java_home>/jre if we can. 210 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */ 211 pslash = strrchr(home_dir, '\\'); 212 if (pslash != NULL) { 213 *pslash = '\0'; /* get rid of \{client|server} */ 214 pslash = strrchr(home_dir, '\\'); 215 if (pslash != NULL) 216 *pslash = '\0'; /* get rid of \bin */ 217 } 218 } 219 220 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1); 221 if (home_path == NULL) 222 return; 223 strcpy(home_path, home_dir); 224 Arguments::set_java_home(home_path); 225 226 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1); 227 if (dll_path == NULL) 228 return; 229 strcpy(dll_path, home_dir); 230 strcat(dll_path, bin); 231 Arguments::set_dll_dir(dll_path); 232 233 if (!set_boot_path('\\', ';')) 234 return; 235 } 236 237 /* library_path */ 238 #define EXT_DIR "\\lib\\ext" 239 #define BIN_DIR "\\bin" 240 #define PACKAGE_DIR "\\Sun\\Java" 241 { 242 /* Win32 library search order (See the documentation for LoadLibrary): 243 * 244 * 1. The directory from which application is loaded. 245 * 2. The current directory 246 * 3. The system wide Java Extensions directory (Java only) 247 * 4. System directory (GetSystemDirectory) 248 * 5. Windows directory (GetWindowsDirectory) 249 * 6. The PATH environment variable 250 */ 251 252 char *library_path; 253 char tmp[MAX_PATH]; 254 char *path_str = ::getenv("PATH"); 255 256 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 257 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10); 258 259 library_path[0] = '\0'; 260 261 GetModuleFileName(NULL, tmp, sizeof(tmp)); 262 *(strrchr(tmp, '\\')) = '\0'; 263 strcat(library_path, tmp); 264 265 strcat(library_path, ";."); 266 267 GetWindowsDirectory(tmp, sizeof(tmp)); 268 strcat(library_path, ";"); 269 strcat(library_path, tmp); 270 strcat(library_path, PACKAGE_DIR BIN_DIR); 271 272 GetSystemDirectory(tmp, sizeof(tmp)); 273 strcat(library_path, ";"); 274 strcat(library_path, tmp); 275 276 GetWindowsDirectory(tmp, sizeof(tmp)); 277 strcat(library_path, ";"); 278 strcat(library_path, tmp); 279 280 if (path_str) { 281 strcat(library_path, ";"); 282 strcat(library_path, path_str); 283 } 284 285 Arguments::set_library_path(library_path); 286 FREE_C_HEAP_ARRAY(char, library_path); 287 } 288 289 /* Default extensions directory */ 290 { 291 char path[MAX_PATH]; 292 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 293 GetWindowsDirectory(path, MAX_PATH); 294 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 295 path, PACKAGE_DIR, EXT_DIR); 296 Arguments::set_ext_dirs(buf); 297 } 298 #undef EXT_DIR 299 #undef BIN_DIR 300 #undef PACKAGE_DIR 301 302 /* Default endorsed standards directory. */ 303 { 304 #define ENDORSED_DIR "\\lib\\endorsed" 305 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR); 306 char * buf = NEW_C_HEAP_ARRAY(char, len); 307 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR); 308 Arguments::set_endorsed_dirs(buf); 309 #undef ENDORSED_DIR 310 } 311 312#ifndef _WIN64 313 // set our UnhandledExceptionFilter and save any previous one 314 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception); 315#endif 316 317 // Done 318 return; 319} 320 321void os::breakpoint() { 322 DebugBreak(); 323} 324 325// Invoked from the BREAKPOINT Macro 326extern "C" void breakpoint() { 327 os::breakpoint(); 328} 329 330// Returns an estimate of the current stack pointer. Result must be guaranteed 331// to point into the calling threads stack, and be no lower than the current 332// stack pointer. 333 334address os::current_stack_pointer() { 335 int dummy; 336 address sp = (address)&dummy; 337 return sp; 338} 339 340// os::current_stack_base() 341// 342// Returns the base of the stack, which is the stack's 343// starting address. This function must be called 344// while running on the stack of the thread being queried. 345 346address os::current_stack_base() { 347 MEMORY_BASIC_INFORMATION minfo; 348 address stack_bottom; 349 size_t stack_size; 350 351 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 352 stack_bottom = (address)minfo.AllocationBase; 353 stack_size = minfo.RegionSize; 354 355 // Add up the sizes of all the regions with the same 356 // AllocationBase. 357 while( 1 ) 358 { 359 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 360 if ( stack_bottom == (address)minfo.AllocationBase ) 361 stack_size += minfo.RegionSize; 362 else 363 break; 364 } 365 366#ifdef _M_IA64 367 // IA64 has memory and register stacks 368 stack_size = stack_size / 2; 369#endif 370 return stack_bottom + stack_size; 371} 372 373size_t os::current_stack_size() { 374 size_t sz; 375 MEMORY_BASIC_INFORMATION minfo; 376 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 377 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 378 return sz; 379} 380 381struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 382 const struct tm* time_struct_ptr = localtime(clock); 383 if (time_struct_ptr != NULL) { 384 *res = *time_struct_ptr; 385 return res; 386 } 387 return NULL; 388} 389 390LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 391 392// Thread start routine for all new Java threads 393static unsigned __stdcall java_start(Thread* thread) { 394 // Try to randomize the cache line index of hot stack frames. 395 // This helps when threads of the same stack traces evict each other's 396 // cache lines. The threads can be either from the same JVM instance, or 397 // from different JVM instances. The benefit is especially true for 398 // processors with hyperthreading technology. 399 static int counter = 0; 400 int pid = os::current_process_id(); 401 _alloca(((pid ^ counter++) & 7) * 128); 402 403 OSThread* osthr = thread->osthread(); 404 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 405 406 if (UseNUMA) { 407 int lgrp_id = os::numa_get_group_id(); 408 if (lgrp_id != -1) { 409 thread->set_lgrp_id(lgrp_id); 410 } 411 } 412 413 414 if (UseVectoredExceptions) { 415 // If we are using vectored exception we don't need to set a SEH 416 thread->run(); 417 } 418 else { 419 // Install a win32 structured exception handler around every thread created 420 // by VM, so VM can genrate error dump when an exception occurred in non- 421 // Java thread (e.g. VM thread). 422 __try { 423 thread->run(); 424 } __except(topLevelExceptionFilter( 425 (_EXCEPTION_POINTERS*)_exception_info())) { 426 // Nothing to do. 427 } 428 } 429 430 // One less thread is executing 431 // When the VMThread gets here, the main thread may have already exited 432 // which frees the CodeHeap containing the Atomic::add code 433 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 434 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); 435 } 436 437 return 0; 438} 439 440static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) { 441 // Allocate the OSThread object 442 OSThread* osthread = new OSThread(NULL, NULL); 443 if (osthread == NULL) return NULL; 444 445 // Initialize support for Java interrupts 446 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 447 if (interrupt_event == NULL) { 448 delete osthread; 449 return NULL; 450 } 451 osthread->set_interrupt_event(interrupt_event); 452 453 // Store info on the Win32 thread into the OSThread 454 osthread->set_thread_handle(thread_handle); 455 osthread->set_thread_id(thread_id); 456 457 if (UseNUMA) { 458 int lgrp_id = os::numa_get_group_id(); 459 if (lgrp_id != -1) { 460 thread->set_lgrp_id(lgrp_id); 461 } 462 } 463 464 // Initial thread state is INITIALIZED, not SUSPENDED 465 osthread->set_state(INITIALIZED); 466 467 return osthread; 468} 469 470 471bool os::create_attached_thread(JavaThread* thread) { 472#ifdef ASSERT 473 thread->verify_not_published(); 474#endif 475 HANDLE thread_h; 476 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 477 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 478 fatal("DuplicateHandle failed\n"); 479 } 480 OSThread* osthread = create_os_thread(thread, thread_h, 481 (int)current_thread_id()); 482 if (osthread == NULL) { 483 return false; 484 } 485 486 // Initial thread state is RUNNABLE 487 osthread->set_state(RUNNABLE); 488 489 thread->set_osthread(osthread); 490 return true; 491} 492 493bool os::create_main_thread(JavaThread* thread) { 494#ifdef ASSERT 495 thread->verify_not_published(); 496#endif 497 if (_starting_thread == NULL) { 498 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 499 if (_starting_thread == NULL) { 500 return false; 501 } 502 } 503 504 // The primordial thread is runnable from the start) 505 _starting_thread->set_state(RUNNABLE); 506 507 thread->set_osthread(_starting_thread); 508 return true; 509} 510 511// Allocate and initialize a new OSThread 512bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 513 unsigned thread_id; 514 515 // Allocate the OSThread object 516 OSThread* osthread = new OSThread(NULL, NULL); 517 if (osthread == NULL) { 518 return false; 519 } 520 521 // Initialize support for Java interrupts 522 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 523 if (interrupt_event == NULL) { 524 delete osthread; 525 return NULL; 526 } 527 osthread->set_interrupt_event(interrupt_event); 528 osthread->set_interrupted(false); 529 530 thread->set_osthread(osthread); 531 532 if (stack_size == 0) { 533 switch (thr_type) { 534 case os::java_thread: 535 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 536 if (JavaThread::stack_size_at_create() > 0) 537 stack_size = JavaThread::stack_size_at_create(); 538 break; 539 case os::compiler_thread: 540 if (CompilerThreadStackSize > 0) { 541 stack_size = (size_t)(CompilerThreadStackSize * K); 542 break; 543 } // else fall through: 544 // use VMThreadStackSize if CompilerThreadStackSize is not defined 545 case os::vm_thread: 546 case os::pgc_thread: 547 case os::cgc_thread: 548 case os::watcher_thread: 549 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 550 break; 551 } 552 } 553 554 // Create the Win32 thread 555 // 556 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 557 // does not specify stack size. Instead, it specifies the size of 558 // initially committed space. The stack size is determined by 559 // PE header in the executable. If the committed "stack_size" is larger 560 // than default value in the PE header, the stack is rounded up to the 561 // nearest multiple of 1MB. For example if the launcher has default 562 // stack size of 320k, specifying any size less than 320k does not 563 // affect the actual stack size at all, it only affects the initial 564 // commitment. On the other hand, specifying 'stack_size' larger than 565 // default value may cause significant increase in memory usage, because 566 // not only the stack space will be rounded up to MB, but also the 567 // entire space is committed upfront. 568 // 569 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 570 // for CreateThread() that can treat 'stack_size' as stack size. However we 571 // are not supposed to call CreateThread() directly according to MSDN 572 // document because JVM uses C runtime library. The good news is that the 573 // flag appears to work with _beginthredex() as well. 574 575#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION 576#define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000) 577#endif 578 579 HANDLE thread_handle = 580 (HANDLE)_beginthreadex(NULL, 581 (unsigned)stack_size, 582 (unsigned (__stdcall *)(void*)) java_start, 583 thread, 584 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, 585 &thread_id); 586 if (thread_handle == NULL) { 587 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again 588 // without the flag. 589 thread_handle = 590 (HANDLE)_beginthreadex(NULL, 591 (unsigned)stack_size, 592 (unsigned (__stdcall *)(void*)) java_start, 593 thread, 594 CREATE_SUSPENDED, 595 &thread_id); 596 } 597 if (thread_handle == NULL) { 598 // Need to clean up stuff we've allocated so far 599 CloseHandle(osthread->interrupt_event()); 600 thread->set_osthread(NULL); 601 delete osthread; 602 return NULL; 603 } 604 605 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); 606 607 // Store info on the Win32 thread into the OSThread 608 osthread->set_thread_handle(thread_handle); 609 osthread->set_thread_id(thread_id); 610 611 // Initial thread state is INITIALIZED, not SUSPENDED 612 osthread->set_state(INITIALIZED); 613 614 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 615 return true; 616} 617 618 619// Free Win32 resources related to the OSThread 620void os::free_thread(OSThread* osthread) { 621 assert(osthread != NULL, "osthread not set"); 622 CloseHandle(osthread->thread_handle()); 623 CloseHandle(osthread->interrupt_event()); 624 delete osthread; 625} 626 627 628static int has_performance_count = 0; 629static jlong first_filetime; 630static jlong initial_performance_count; 631static jlong performance_frequency; 632 633 634jlong as_long(LARGE_INTEGER x) { 635 jlong result = 0; // initialization to avoid warning 636 set_high(&result, x.HighPart); 637 set_low(&result, x.LowPart); 638 return result; 639} 640 641 642jlong os::elapsed_counter() { 643 LARGE_INTEGER count; 644 if (has_performance_count) { 645 QueryPerformanceCounter(&count); 646 return as_long(count) - initial_performance_count; 647 } else { 648 FILETIME wt; 649 GetSystemTimeAsFileTime(&wt); 650 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime); 651 } 652} 653 654 655jlong os::elapsed_frequency() { 656 if (has_performance_count) { 657 return performance_frequency; 658 } else { 659 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601. 660 return 10000000; 661 } 662} 663 664 665julong os::available_memory() { 666 return win32::available_memory(); 667} 668 669julong os::win32::available_memory() { 670 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 671 // value if total memory is larger than 4GB 672 MEMORYSTATUSEX ms; 673 ms.dwLength = sizeof(ms); 674 GlobalMemoryStatusEx(&ms); 675 676 return (julong)ms.ullAvailPhys; 677} 678 679julong os::physical_memory() { 680 return win32::physical_memory(); 681} 682 683julong os::allocatable_physical_memory(julong size) { 684#ifdef _LP64 685 return size; 686#else 687 // Limit to 1400m because of the 2gb address space wall 688 return MIN2(size, (julong)1400*M); 689#endif 690} 691 692// VC6 lacks DWORD_PTR 693#if _MSC_VER < 1300 694typedef UINT_PTR DWORD_PTR; 695#endif 696 697int os::active_processor_count() { 698 DWORD_PTR lpProcessAffinityMask = 0; 699 DWORD_PTR lpSystemAffinityMask = 0; 700 int proc_count = processor_count(); 701 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 702 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 703 // Nof active processors is number of bits in process affinity mask 704 int bitcount = 0; 705 while (lpProcessAffinityMask != 0) { 706 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 707 bitcount++; 708 } 709 return bitcount; 710 } else { 711 return proc_count; 712 } 713} 714 715bool os::distribute_processes(uint length, uint* distribution) { 716 // Not yet implemented. 717 return false; 718} 719 720bool os::bind_to_processor(uint processor_id) { 721 // Not yet implemented. 722 return false; 723} 724 725static void initialize_performance_counter() { 726 LARGE_INTEGER count; 727 if (QueryPerformanceFrequency(&count)) { 728 has_performance_count = 1; 729 performance_frequency = as_long(count); 730 QueryPerformanceCounter(&count); 731 initial_performance_count = as_long(count); 732 } else { 733 has_performance_count = 0; 734 FILETIME wt; 735 GetSystemTimeAsFileTime(&wt); 736 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 737 } 738} 739 740 741double os::elapsedTime() { 742 return (double) elapsed_counter() / (double) elapsed_frequency(); 743} 744 745 746// Windows format: 747// The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 748// Java format: 749// Java standards require the number of milliseconds since 1/1/1970 750 751// Constant offset - calculated using offset() 752static jlong _offset = 116444736000000000; 753// Fake time counter for reproducible results when debugging 754static jlong fake_time = 0; 755 756#ifdef ASSERT 757// Just to be safe, recalculate the offset in debug mode 758static jlong _calculated_offset = 0; 759static int _has_calculated_offset = 0; 760 761jlong offset() { 762 if (_has_calculated_offset) return _calculated_offset; 763 SYSTEMTIME java_origin; 764 java_origin.wYear = 1970; 765 java_origin.wMonth = 1; 766 java_origin.wDayOfWeek = 0; // ignored 767 java_origin.wDay = 1; 768 java_origin.wHour = 0; 769 java_origin.wMinute = 0; 770 java_origin.wSecond = 0; 771 java_origin.wMilliseconds = 0; 772 FILETIME jot; 773 if (!SystemTimeToFileTime(&java_origin, &jot)) { 774 fatal(err_msg("Error = %d\nWindows error", GetLastError())); 775 } 776 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 777 _has_calculated_offset = 1; 778 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 779 return _calculated_offset; 780} 781#else 782jlong offset() { 783 return _offset; 784} 785#endif 786 787jlong windows_to_java_time(FILETIME wt) { 788 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 789 return (a - offset()) / 10000; 790} 791 792FILETIME java_to_windows_time(jlong l) { 793 jlong a = (l * 10000) + offset(); 794 FILETIME result; 795 result.dwHighDateTime = high(a); 796 result.dwLowDateTime = low(a); 797 return result; 798} 799 800// For now, we say that Windows does not support vtime. I have no idea 801// whether it can actually be made to (DLD, 9/13/05). 802 803bool os::supports_vtime() { return false; } 804bool os::enable_vtime() { return false; } 805bool os::vtime_enabled() { return false; } 806double os::elapsedVTime() { 807 // better than nothing, but not much 808 return elapsedTime(); 809} 810 811jlong os::javaTimeMillis() { 812 if (UseFakeTimers) { 813 return fake_time++; 814 } else { 815 FILETIME wt; 816 GetSystemTimeAsFileTime(&wt); 817 return windows_to_java_time(wt); 818 } 819} 820 821#define NANOS_PER_SEC CONST64(1000000000) 822#define NANOS_PER_MILLISEC 1000000 823jlong os::javaTimeNanos() { 824 if (!has_performance_count) { 825 return javaTimeMillis() * NANOS_PER_MILLISEC; // the best we can do. 826 } else { 827 LARGE_INTEGER current_count; 828 QueryPerformanceCounter(¤t_count); 829 double current = as_long(current_count); 830 double freq = performance_frequency; 831 jlong time = (jlong)((current/freq) * NANOS_PER_SEC); 832 return time; 833 } 834} 835 836void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 837 if (!has_performance_count) { 838 // javaTimeMillis() doesn't have much percision, 839 // but it is not going to wrap -- so all 64 bits 840 info_ptr->max_value = ALL_64_BITS; 841 842 // this is a wall clock timer, so may skip 843 info_ptr->may_skip_backward = true; 844 info_ptr->may_skip_forward = true; 845 } else { 846 jlong freq = performance_frequency; 847 if (freq < NANOS_PER_SEC) { 848 // the performance counter is 64 bits and we will 849 // be multiplying it -- so no wrap in 64 bits 850 info_ptr->max_value = ALL_64_BITS; 851 } else if (freq > NANOS_PER_SEC) { 852 // use the max value the counter can reach to 853 // determine the max value which could be returned 854 julong max_counter = (julong)ALL_64_BITS; 855 info_ptr->max_value = (jlong)(max_counter / (freq / NANOS_PER_SEC)); 856 } else { 857 // the performance counter is 64 bits and we will 858 // be using it directly -- so no wrap in 64 bits 859 info_ptr->max_value = ALL_64_BITS; 860 } 861 862 // using a counter, so no skipping 863 info_ptr->may_skip_backward = false; 864 info_ptr->may_skip_forward = false; 865 } 866 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 867} 868 869char* os::local_time_string(char *buf, size_t buflen) { 870 SYSTEMTIME st; 871 GetLocalTime(&st); 872 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 873 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 874 return buf; 875} 876 877bool os::getTimesSecs(double* process_real_time, 878 double* process_user_time, 879 double* process_system_time) { 880 HANDLE h_process = GetCurrentProcess(); 881 FILETIME create_time, exit_time, kernel_time, user_time; 882 BOOL result = GetProcessTimes(h_process, 883 &create_time, 884 &exit_time, 885 &kernel_time, 886 &user_time); 887 if (result != 0) { 888 FILETIME wt; 889 GetSystemTimeAsFileTime(&wt); 890 jlong rtc_millis = windows_to_java_time(wt); 891 jlong user_millis = windows_to_java_time(user_time); 892 jlong system_millis = windows_to_java_time(kernel_time); 893 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 894 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); 895 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); 896 return true; 897 } else { 898 return false; 899 } 900} 901 902void os::shutdown() { 903 904 // allow PerfMemory to attempt cleanup of any persistent resources 905 perfMemory_exit(); 906 907 // flush buffered output, finish log files 908 ostream_abort(); 909 910 // Check for abort hook 911 abort_hook_t abort_hook = Arguments::abort_hook(); 912 if (abort_hook != NULL) { 913 abort_hook(); 914 } 915} 916 917void os::abort(bool dump_core) 918{ 919 os::shutdown(); 920 // no core dump on Windows 921 ::exit(1); 922} 923 924// Die immediately, no exit hook, no abort hook, no cleanup. 925void os::die() { 926 _exit(-1); 927} 928 929// Directory routines copied from src/win32/native/java/io/dirent_md.c 930// * dirent_md.c 1.15 00/02/02 931// 932// The declarations for DIR and struct dirent are in jvm_win32.h. 933 934/* Caller must have already run dirname through JVM_NativePath, which removes 935 duplicate slashes and converts all instances of '/' into '\\'. */ 936 937DIR * 938os::opendir(const char *dirname) 939{ 940 assert(dirname != NULL, "just checking"); // hotspot change 941 DIR *dirp = (DIR *)malloc(sizeof(DIR)); 942 DWORD fattr; // hotspot change 943 char alt_dirname[4] = { 0, 0, 0, 0 }; 944 945 if (dirp == 0) { 946 errno = ENOMEM; 947 return 0; 948 } 949 950 /* 951 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it 952 * as a directory in FindFirstFile(). We detect this case here and 953 * prepend the current drive name. 954 */ 955 if (dirname[1] == '\0' && dirname[0] == '\\') { 956 alt_dirname[0] = _getdrive() + 'A' - 1; 957 alt_dirname[1] = ':'; 958 alt_dirname[2] = '\\'; 959 alt_dirname[3] = '\0'; 960 dirname = alt_dirname; 961 } 962 963 dirp->path = (char *)malloc(strlen(dirname) + 5); 964 if (dirp->path == 0) { 965 free(dirp); 966 errno = ENOMEM; 967 return 0; 968 } 969 strcpy(dirp->path, dirname); 970 971 fattr = GetFileAttributes(dirp->path); 972 if (fattr == 0xffffffff) { 973 free(dirp->path); 974 free(dirp); 975 errno = ENOENT; 976 return 0; 977 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 978 free(dirp->path); 979 free(dirp); 980 errno = ENOTDIR; 981 return 0; 982 } 983 984 /* Append "*.*", or possibly "\\*.*", to path */ 985 if (dirp->path[1] == ':' 986 && (dirp->path[2] == '\0' 987 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 988 /* No '\\' needed for cases like "Z:" or "Z:\" */ 989 strcat(dirp->path, "*.*"); 990 } else { 991 strcat(dirp->path, "\\*.*"); 992 } 993 994 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 995 if (dirp->handle == INVALID_HANDLE_VALUE) { 996 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 997 free(dirp->path); 998 free(dirp); 999 errno = EACCES; 1000 return 0; 1001 } 1002 } 1003 return dirp; 1004} 1005 1006/* parameter dbuf unused on Windows */ 1007 1008struct dirent * 1009os::readdir(DIR *dirp, dirent *dbuf) 1010{ 1011 assert(dirp != NULL, "just checking"); // hotspot change 1012 if (dirp->handle == INVALID_HANDLE_VALUE) { 1013 return 0; 1014 } 1015 1016 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 1017 1018 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 1019 if (GetLastError() == ERROR_INVALID_HANDLE) { 1020 errno = EBADF; 1021 return 0; 1022 } 1023 FindClose(dirp->handle); 1024 dirp->handle = INVALID_HANDLE_VALUE; 1025 } 1026 1027 return &dirp->dirent; 1028} 1029 1030int 1031os::closedir(DIR *dirp) 1032{ 1033 assert(dirp != NULL, "just checking"); // hotspot change 1034 if (dirp->handle != INVALID_HANDLE_VALUE) { 1035 if (!FindClose(dirp->handle)) { 1036 errno = EBADF; 1037 return -1; 1038 } 1039 dirp->handle = INVALID_HANDLE_VALUE; 1040 } 1041 free(dirp->path); 1042 free(dirp); 1043 return 0; 1044} 1045 1046const char* os::get_temp_directory() { 1047 const char *prop = Arguments::get_property("java.io.tmpdir"); 1048 if (prop != 0) return prop; 1049 static char path_buf[MAX_PATH]; 1050 if (GetTempPath(MAX_PATH, path_buf)>0) 1051 return path_buf; 1052 else{ 1053 path_buf[0]='\0'; 1054 return path_buf; 1055 } 1056} 1057 1058static bool file_exists(const char* filename) { 1059 if (filename == NULL || strlen(filename) == 0) { 1060 return false; 1061 } 1062 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES; 1063} 1064 1065void os::dll_build_name(char *buffer, size_t buflen, 1066 const char* pname, const char* fname) { 1067 const size_t pnamelen = pname ? strlen(pname) : 0; 1068 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0; 1069 1070 // Quietly truncates on buffer overflow. Should be an error. 1071 if (pnamelen + strlen(fname) + 10 > buflen) { 1072 *buffer = '\0'; 1073 return; 1074 } 1075 1076 if (pnamelen == 0) { 1077 jio_snprintf(buffer, buflen, "%s.dll", fname); 1078 } else if (c == ':' || c == '\\') { 1079 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname); 1080 } else if (strchr(pname, *os::path_separator()) != NULL) { 1081 int n; 1082 char** pelements = split_path(pname, &n); 1083 for (int i = 0 ; i < n ; i++) { 1084 char* path = pelements[i]; 1085 // Really shouldn't be NULL, but check can't hurt 1086 size_t plen = (path == NULL) ? 0 : strlen(path); 1087 if (plen == 0) { 1088 continue; // skip the empty path values 1089 } 1090 const char lastchar = path[plen - 1]; 1091 if (lastchar == ':' || lastchar == '\\') { 1092 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname); 1093 } else { 1094 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname); 1095 } 1096 if (file_exists(buffer)) { 1097 break; 1098 } 1099 } 1100 // release the storage 1101 for (int i = 0 ; i < n ; i++) { 1102 if (pelements[i] != NULL) { 1103 FREE_C_HEAP_ARRAY(char, pelements[i]); 1104 } 1105 } 1106 if (pelements != NULL) { 1107 FREE_C_HEAP_ARRAY(char*, pelements); 1108 } 1109 } else { 1110 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname); 1111 } 1112} 1113 1114// Needs to be in os specific directory because windows requires another 1115// header file <direct.h> 1116const char* os::get_current_directory(char *buf, int buflen) { 1117 return _getcwd(buf, buflen); 1118} 1119 1120//----------------------------------------------------------- 1121// Helper functions for fatal error handler 1122 1123// The following library functions are resolved dynamically at runtime: 1124 1125// PSAPI functions, for Windows NT, 2000, XP 1126 1127// psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform 1128// SDK from Microsoft. Here are the definitions copied from psapi.h 1129typedef struct _MODULEINFO { 1130 LPVOID lpBaseOfDll; 1131 DWORD SizeOfImage; 1132 LPVOID EntryPoint; 1133} MODULEINFO, *LPMODULEINFO; 1134 1135static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD ); 1136static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD ); 1137static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD ); 1138 1139// ToolHelp Functions, for Windows 95, 98 and ME 1140 1141static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ; 1142static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ; 1143static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ; 1144 1145bool _has_psapi; 1146bool _psapi_init = false; 1147bool _has_toolhelp; 1148 1149static bool _init_psapi() { 1150 HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ; 1151 if( psapi == NULL ) return false ; 1152 1153 _EnumProcessModules = CAST_TO_FN_PTR( 1154 BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD), 1155 GetProcAddress(psapi, "EnumProcessModules")) ; 1156 _GetModuleFileNameEx = CAST_TO_FN_PTR( 1157 DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD), 1158 GetProcAddress(psapi, "GetModuleFileNameExA")); 1159 _GetModuleInformation = CAST_TO_FN_PTR( 1160 BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD), 1161 GetProcAddress(psapi, "GetModuleInformation")); 1162 1163 _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation); 1164 _psapi_init = true; 1165 return _has_psapi; 1166} 1167 1168static bool _init_toolhelp() { 1169 HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ; 1170 if (kernel32 == NULL) return false ; 1171 1172 _CreateToolhelp32Snapshot = CAST_TO_FN_PTR( 1173 HANDLE(WINAPI *)(DWORD,DWORD), 1174 GetProcAddress(kernel32, "CreateToolhelp32Snapshot")); 1175 _Module32First = CAST_TO_FN_PTR( 1176 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32), 1177 GetProcAddress(kernel32, "Module32First" )); 1178 _Module32Next = CAST_TO_FN_PTR( 1179 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32), 1180 GetProcAddress(kernel32, "Module32Next" )); 1181 1182 _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next); 1183 return _has_toolhelp; 1184} 1185 1186#ifdef _WIN64 1187// Helper routine which returns true if address in 1188// within the NTDLL address space. 1189// 1190static bool _addr_in_ntdll( address addr ) 1191{ 1192 HMODULE hmod; 1193 MODULEINFO minfo; 1194 1195 hmod = GetModuleHandle("NTDLL.DLL"); 1196 if ( hmod == NULL ) return false; 1197 if ( !_GetModuleInformation( GetCurrentProcess(), hmod, 1198 &minfo, sizeof(MODULEINFO)) ) 1199 return false; 1200 1201 if ( (addr >= minfo.lpBaseOfDll) && 1202 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) 1203 return true; 1204 else 1205 return false; 1206} 1207#endif 1208 1209 1210// Enumerate all modules for a given process ID 1211// 1212// Notice that Windows 95/98/Me and Windows NT/2000/XP have 1213// different API for doing this. We use PSAPI.DLL on NT based 1214// Windows and ToolHelp on 95/98/Me. 1215 1216// Callback function that is called by enumerate_modules() on 1217// every DLL module. 1218// Input parameters: 1219// int pid, 1220// char* module_file_name, 1221// address module_base_addr, 1222// unsigned module_size, 1223// void* param 1224typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *); 1225 1226// enumerate_modules for Windows NT, using PSAPI 1227static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param) 1228{ 1229 HANDLE hProcess ; 1230 1231# define MAX_NUM_MODULES 128 1232 HMODULE modules[MAX_NUM_MODULES]; 1233 static char filename[ MAX_PATH ]; 1234 int result = 0; 1235 1236 if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0; 1237 1238 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1239 FALSE, pid ) ; 1240 if (hProcess == NULL) return 0; 1241 1242 DWORD size_needed; 1243 if (!_EnumProcessModules(hProcess, modules, 1244 sizeof(modules), &size_needed)) { 1245 CloseHandle( hProcess ); 1246 return 0; 1247 } 1248 1249 // number of modules that are currently loaded 1250 int num_modules = size_needed / sizeof(HMODULE); 1251 1252 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1253 // Get Full pathname: 1254 if(!_GetModuleFileNameEx(hProcess, modules[i], 1255 filename, sizeof(filename))) { 1256 filename[0] = '\0'; 1257 } 1258 1259 MODULEINFO modinfo; 1260 if (!_GetModuleInformation(hProcess, modules[i], 1261 &modinfo, sizeof(modinfo))) { 1262 modinfo.lpBaseOfDll = NULL; 1263 modinfo.SizeOfImage = 0; 1264 } 1265 1266 // Invoke callback function 1267 result = func(pid, filename, (address)modinfo.lpBaseOfDll, 1268 modinfo.SizeOfImage, param); 1269 if (result) break; 1270 } 1271 1272 CloseHandle( hProcess ) ; 1273 return result; 1274} 1275 1276 1277// enumerate_modules for Windows 95/98/ME, using TOOLHELP 1278static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param) 1279{ 1280 HANDLE hSnapShot ; 1281 static MODULEENTRY32 modentry ; 1282 int result = 0; 1283 1284 if (!_has_toolhelp) return 0; 1285 1286 // Get a handle to a Toolhelp snapshot of the system 1287 hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ; 1288 if( hSnapShot == INVALID_HANDLE_VALUE ) { 1289 return FALSE ; 1290 } 1291 1292 // iterate through all modules 1293 modentry.dwSize = sizeof(MODULEENTRY32) ; 1294 bool not_done = _Module32First( hSnapShot, &modentry ) != 0; 1295 1296 while( not_done ) { 1297 // invoke the callback 1298 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr, 1299 modentry.modBaseSize, param); 1300 if (result) break; 1301 1302 modentry.dwSize = sizeof(MODULEENTRY32) ; 1303 not_done = _Module32Next( hSnapShot, &modentry ) != 0; 1304 } 1305 1306 CloseHandle(hSnapShot); 1307 return result; 1308} 1309 1310int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param ) 1311{ 1312 // Get current process ID if caller doesn't provide it. 1313 if (!pid) pid = os::current_process_id(); 1314 1315 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param); 1316 else return _enumerate_modules_windows(pid, func, param); 1317} 1318 1319struct _modinfo { 1320 address addr; 1321 char* full_path; // point to a char buffer 1322 int buflen; // size of the buffer 1323 address base_addr; 1324}; 1325 1326static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr, 1327 unsigned size, void * param) { 1328 struct _modinfo *pmod = (struct _modinfo *)param; 1329 if (!pmod) return -1; 1330 1331 if (base_addr <= pmod->addr && 1332 base_addr+size > pmod->addr) { 1333 // if a buffer is provided, copy path name to the buffer 1334 if (pmod->full_path) { 1335 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1336 } 1337 pmod->base_addr = base_addr; 1338 return 1; 1339 } 1340 return 0; 1341} 1342 1343bool os::dll_address_to_library_name(address addr, char* buf, 1344 int buflen, int* offset) { 1345// NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1346// return the full path to the DLL file, sometimes it returns path 1347// to the corresponding PDB file (debug info); sometimes it only 1348// returns partial path, which makes life painful. 1349 1350 struct _modinfo mi; 1351 mi.addr = addr; 1352 mi.full_path = buf; 1353 mi.buflen = buflen; 1354 int pid = os::current_process_id(); 1355 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) { 1356 // buf already contains path name 1357 if (offset) *offset = addr - mi.base_addr; 1358 return true; 1359 } else { 1360 if (buf) buf[0] = '\0'; 1361 if (offset) *offset = -1; 1362 return false; 1363 } 1364} 1365 1366bool os::dll_address_to_function_name(address addr, char *buf, 1367 int buflen, int *offset) { 1368 // Unimplemented on Windows - in order to use SymGetSymFromAddr(), 1369 // we need to initialize imagehlp/dbghelp, then load symbol table 1370 // for every module. That's too much work to do after a fatal error. 1371 // For an example on how to implement this function, see 1.4.2. 1372 if (offset) *offset = -1; 1373 if (buf) buf[0] = '\0'; 1374 return false; 1375} 1376 1377// save the start and end address of jvm.dll into param[0] and param[1] 1378static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr, 1379 unsigned size, void * param) { 1380 if (!param) return -1; 1381 1382 if (base_addr <= (address)_locate_jvm_dll && 1383 base_addr+size > (address)_locate_jvm_dll) { 1384 ((address*)param)[0] = base_addr; 1385 ((address*)param)[1] = base_addr + size; 1386 return 1; 1387 } 1388 return 0; 1389} 1390 1391address vm_lib_location[2]; // start and end address of jvm.dll 1392 1393// check if addr is inside jvm.dll 1394bool os::address_is_in_vm(address addr) { 1395 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1396 int pid = os::current_process_id(); 1397 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) { 1398 assert(false, "Can't find jvm module."); 1399 return false; 1400 } 1401 } 1402 1403 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1404} 1405 1406// print module info; param is outputStream* 1407static int _print_module(int pid, char* fname, address base, 1408 unsigned size, void* param) { 1409 if (!param) return -1; 1410 1411 outputStream* st = (outputStream*)param; 1412 1413 address end_addr = base + size; 1414 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname); 1415 return 0; 1416} 1417 1418// Loads .dll/.so and 1419// in case of error it checks if .dll/.so was built for the 1420// same architecture as Hotspot is running on 1421void * os::dll_load(const char *name, char *ebuf, int ebuflen) 1422{ 1423 void * result = LoadLibrary(name); 1424 if (result != NULL) 1425 { 1426 return result; 1427 } 1428 1429 long errcode = GetLastError(); 1430 if (errcode == ERROR_MOD_NOT_FOUND) { 1431 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1); 1432 ebuf[ebuflen-1]='\0'; 1433 return NULL; 1434 } 1435 1436 // Parsing dll below 1437 // If we can read dll-info and find that dll was built 1438 // for an architecture other than Hotspot is running in 1439 // - then print to buffer "DLL was built for a different architecture" 1440 // else call getLastErrorString to obtain system error message 1441 1442 // Read system error message into ebuf 1443 // It may or may not be overwritten below (in the for loop and just above) 1444 getLastErrorString(ebuf, (size_t) ebuflen); 1445 ebuf[ebuflen-1]='\0'; 1446 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0); 1447 if (file_descriptor<0) 1448 { 1449 return NULL; 1450 } 1451 1452 uint32_t signature_offset; 1453 uint16_t lib_arch=0; 1454 bool failed_to_get_lib_arch= 1455 ( 1456 //Go to position 3c in the dll 1457 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0) 1458 || 1459 // Read loacation of signature 1460 (sizeof(signature_offset)!= 1461 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset)))) 1462 || 1463 //Go to COFF File Header in dll 1464 //that is located after"signature" (4 bytes long) 1465 (os::seek_to_file_offset(file_descriptor, 1466 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0) 1467 || 1468 //Read field that contains code of architecture 1469 // that dll was build for 1470 (sizeof(lib_arch)!= 1471 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch)))) 1472 ); 1473 1474 ::close(file_descriptor); 1475 if (failed_to_get_lib_arch) 1476 { 1477 // file i/o error - report getLastErrorString(...) msg 1478 return NULL; 1479 } 1480 1481 typedef struct 1482 { 1483 uint16_t arch_code; 1484 char* arch_name; 1485 } arch_t; 1486 1487 static const arch_t arch_array[]={ 1488 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1489 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1490 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1491 }; 1492 #if (defined _M_IA64) 1493 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64; 1494 #elif (defined _M_AMD64) 1495 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64; 1496 #elif (defined _M_IX86) 1497 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386; 1498 #else 1499 #error Method os::dll_load requires that one of following \ 1500 is defined :_M_IA64,_M_AMD64 or _M_IX86 1501 #endif 1502 1503 1504 // Obtain a string for printf operation 1505 // lib_arch_str shall contain string what platform this .dll was built for 1506 // running_arch_str shall string contain what platform Hotspot was built for 1507 char *running_arch_str=NULL,*lib_arch_str=NULL; 1508 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++) 1509 { 1510 if (lib_arch==arch_array[i].arch_code) 1511 lib_arch_str=arch_array[i].arch_name; 1512 if (running_arch==arch_array[i].arch_code) 1513 running_arch_str=arch_array[i].arch_name; 1514 } 1515 1516 assert(running_arch_str, 1517 "Didn't find runing architecture code in arch_array"); 1518 1519 // If the architure is right 1520 // but some other error took place - report getLastErrorString(...) msg 1521 if (lib_arch == running_arch) 1522 { 1523 return NULL; 1524 } 1525 1526 if (lib_arch_str!=NULL) 1527 { 1528 ::_snprintf(ebuf, ebuflen-1, 1529 "Can't load %s-bit .dll on a %s-bit platform", 1530 lib_arch_str,running_arch_str); 1531 } 1532 else 1533 { 1534 // don't know what architecture this dll was build for 1535 ::_snprintf(ebuf, ebuflen-1, 1536 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1537 lib_arch,running_arch_str); 1538 } 1539 1540 return NULL; 1541} 1542 1543 1544void os::print_dll_info(outputStream *st) { 1545 int pid = os::current_process_id(); 1546 st->print_cr("Dynamic libraries:"); 1547 enumerate_modules(pid, _print_module, (void *)st); 1548} 1549 1550// function pointer to Windows API "GetNativeSystemInfo". 1551typedef void (WINAPI *GetNativeSystemInfo_func_type)(LPSYSTEM_INFO); 1552static GetNativeSystemInfo_func_type _GetNativeSystemInfo; 1553 1554void os::print_os_info(outputStream* st) { 1555 st->print("OS:"); 1556 1557 OSVERSIONINFOEX osvi; 1558 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1559 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1560 1561 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1562 st->print_cr("N/A"); 1563 return; 1564 } 1565 1566 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion; 1567 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) { 1568 switch (os_vers) { 1569 case 3051: st->print(" Windows NT 3.51"); break; 1570 case 4000: st->print(" Windows NT 4.0"); break; 1571 case 5000: st->print(" Windows 2000"); break; 1572 case 5001: st->print(" Windows XP"); break; 1573 case 5002: 1574 case 6000: 1575 case 6001: { 1576 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1577 // find out whether we are running on 64 bit processor or not. 1578 SYSTEM_INFO si; 1579 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1580 // Check to see if _GetNativeSystemInfo has been initialized. 1581 if (_GetNativeSystemInfo == NULL) { 1582 HMODULE hKernel32 = GetModuleHandle(TEXT("kernel32.dll")); 1583 _GetNativeSystemInfo = 1584 CAST_TO_FN_PTR(GetNativeSystemInfo_func_type, 1585 GetProcAddress(hKernel32, 1586 "GetNativeSystemInfo")); 1587 if (_GetNativeSystemInfo == NULL) 1588 GetSystemInfo(&si); 1589 } else { 1590 _GetNativeSystemInfo(&si); 1591 } 1592 if (os_vers == 5002) { 1593 if (osvi.wProductType == VER_NT_WORKSTATION && 1594 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) 1595 st->print(" Windows XP x64 Edition"); 1596 else 1597 st->print(" Windows Server 2003 family"); 1598 } else if (os_vers == 6000) { 1599 if (osvi.wProductType == VER_NT_WORKSTATION) 1600 st->print(" Windows Vista"); 1601 else 1602 st->print(" Windows Server 2008"); 1603 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) 1604 st->print(" , 64 bit"); 1605 } else if (os_vers == 6001) { 1606 if (osvi.wProductType == VER_NT_WORKSTATION) { 1607 st->print(" Windows 7"); 1608 } else { 1609 // Unrecognized windows, print out its major and minor versions 1610 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1611 } 1612 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) 1613 st->print(" , 64 bit"); 1614 } else { // future os 1615 // Unrecognized windows, print out its major and minor versions 1616 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1617 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) 1618 st->print(" , 64 bit"); 1619 } 1620 break; 1621 } 1622 default: // future windows, print out its major and minor versions 1623 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1624 } 1625 } else { 1626 switch (os_vers) { 1627 case 4000: st->print(" Windows 95"); break; 1628 case 4010: st->print(" Windows 98"); break; 1629 case 4090: st->print(" Windows Me"); break; 1630 default: // future windows, print out its major and minor versions 1631 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1632 } 1633 } 1634 st->print(" Build %d", osvi.dwBuildNumber); 1635 st->print(" %s", osvi.szCSDVersion); // service pack 1636 st->cr(); 1637} 1638 1639void os::print_memory_info(outputStream* st) { 1640 st->print("Memory:"); 1641 st->print(" %dk page", os::vm_page_size()>>10); 1642 1643 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1644 // value if total memory is larger than 4GB 1645 MEMORYSTATUSEX ms; 1646 ms.dwLength = sizeof(ms); 1647 GlobalMemoryStatusEx(&ms); 1648 1649 st->print(", physical %uk", os::physical_memory() >> 10); 1650 st->print("(%uk free)", os::available_memory() >> 10); 1651 1652 st->print(", swap %uk", ms.ullTotalPageFile >> 10); 1653 st->print("(%uk free)", ms.ullAvailPageFile >> 10); 1654 st->cr(); 1655} 1656 1657void os::print_siginfo(outputStream *st, void *siginfo) { 1658 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1659 st->print("siginfo:"); 1660 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1661 1662 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1663 er->NumberParameters >= 2) { 1664 switch (er->ExceptionInformation[0]) { 1665 case 0: st->print(", reading address"); break; 1666 case 1: st->print(", writing address"); break; 1667 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1668 er->ExceptionInformation[0]); 1669 } 1670 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1671 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1672 er->NumberParameters >= 2 && UseSharedSpaces) { 1673 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1674 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1675 st->print("\n\nError accessing class data sharing archive." \ 1676 " Mapped file inaccessible during execution, " \ 1677 " possible disk/network problem."); 1678 } 1679 } else { 1680 int num = er->NumberParameters; 1681 if (num > 0) { 1682 st->print(", ExceptionInformation="); 1683 for (int i = 0; i < num; i++) { 1684 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1685 } 1686 } 1687 } 1688 st->cr(); 1689} 1690 1691void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1692 // do nothing 1693} 1694 1695static char saved_jvm_path[MAX_PATH] = {0}; 1696 1697// Find the full path to the current module, jvm.dll or jvm_g.dll 1698void os::jvm_path(char *buf, jint buflen) { 1699 // Error checking. 1700 if (buflen < MAX_PATH) { 1701 assert(false, "must use a large-enough buffer"); 1702 buf[0] = '\0'; 1703 return; 1704 } 1705 // Lazy resolve the path to current module. 1706 if (saved_jvm_path[0] != 0) { 1707 strcpy(buf, saved_jvm_path); 1708 return; 1709 } 1710 1711 buf[0] = '\0'; 1712 if (strcmp(Arguments::sun_java_launcher(), "gamma") == 0) { 1713 // Support for the gamma launcher. Check for an 1714 // ALT_JAVA_HOME or JAVA_HOME environment variable 1715 // and fix up the path so it looks like 1716 // libjvm.so is installed there (append a fake suffix 1717 // hotspot/libjvm.so). 1718 char* java_home_var = ::getenv("ALT_JAVA_HOME"); 1719 if (java_home_var == NULL) { 1720 java_home_var = ::getenv("JAVA_HOME"); 1721 } 1722 if (java_home_var != NULL && java_home_var[0] != 0) { 1723 1724 strncpy(buf, java_home_var, buflen); 1725 1726 // determine if this is a legacy image or modules image 1727 // modules image doesn't have "jre" subdirectory 1728 size_t len = strlen(buf); 1729 char* jrebin_p = buf + len; 1730 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1731 if (0 != _access(buf, 0)) { 1732 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1733 } 1734 len = strlen(buf); 1735 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1736 } 1737 } 1738 1739 if(buf[0] == '\0') { 1740 GetModuleFileName(vm_lib_handle, buf, buflen); 1741 } 1742 strcpy(saved_jvm_path, buf); 1743} 1744 1745 1746void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1747#ifndef _WIN64 1748 st->print("_"); 1749#endif 1750} 1751 1752 1753void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1754#ifndef _WIN64 1755 st->print("@%d", args_size * sizeof(int)); 1756#endif 1757} 1758 1759// This method is a copy of JDK's sysGetLastErrorString 1760// from src/windows/hpi/src/system_md.c 1761 1762size_t os::lasterror(char *buf, size_t len) { 1763 long errval; 1764 1765 if ((errval = GetLastError()) != 0) { 1766 /* DOS error */ 1767 int n = (int)FormatMessage( 1768 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1769 NULL, 1770 errval, 1771 0, 1772 buf, 1773 (DWORD)len, 1774 NULL); 1775 if (n > 3) { 1776 /* Drop final '.', CR, LF */ 1777 if (buf[n - 1] == '\n') n--; 1778 if (buf[n - 1] == '\r') n--; 1779 if (buf[n - 1] == '.') n--; 1780 buf[n] = '\0'; 1781 } 1782 return n; 1783 } 1784 1785 if (errno != 0) { 1786 /* C runtime error that has no corresponding DOS error code */ 1787 const char *s = strerror(errno); 1788 size_t n = strlen(s); 1789 if (n >= len) n = len - 1; 1790 strncpy(buf, s, n); 1791 buf[n] = '\0'; 1792 return n; 1793 } 1794 return 0; 1795} 1796 1797// sun.misc.Signal 1798// NOTE that this is a workaround for an apparent kernel bug where if 1799// a signal handler for SIGBREAK is installed then that signal handler 1800// takes priority over the console control handler for CTRL_CLOSE_EVENT. 1801// See bug 4416763. 1802static void (*sigbreakHandler)(int) = NULL; 1803 1804static void UserHandler(int sig, void *siginfo, void *context) { 1805 os::signal_notify(sig); 1806 // We need to reinstate the signal handler each time... 1807 os::signal(sig, (void*)UserHandler); 1808} 1809 1810void* os::user_handler() { 1811 return (void*) UserHandler; 1812} 1813 1814void* os::signal(int signal_number, void* handler) { 1815 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1816 void (*oldHandler)(int) = sigbreakHandler; 1817 sigbreakHandler = (void (*)(int)) handler; 1818 return (void*) oldHandler; 1819 } else { 1820 return (void*)::signal(signal_number, (void (*)(int))handler); 1821 } 1822} 1823 1824void os::signal_raise(int signal_number) { 1825 raise(signal_number); 1826} 1827 1828// The Win32 C runtime library maps all console control events other than ^C 1829// into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1830// logoff, and shutdown events. We therefore install our own console handler 1831// that raises SIGTERM for the latter cases. 1832// 1833static BOOL WINAPI consoleHandler(DWORD event) { 1834 switch(event) { 1835 case CTRL_C_EVENT: 1836 if (is_error_reported()) { 1837 // Ctrl-C is pressed during error reporting, likely because the error 1838 // handler fails to abort. Let VM die immediately. 1839 os::die(); 1840 } 1841 1842 os::signal_raise(SIGINT); 1843 return TRUE; 1844 break; 1845 case CTRL_BREAK_EVENT: 1846 if (sigbreakHandler != NULL) { 1847 (*sigbreakHandler)(SIGBREAK); 1848 } 1849 return TRUE; 1850 break; 1851 case CTRL_CLOSE_EVENT: 1852 case CTRL_LOGOFF_EVENT: 1853 case CTRL_SHUTDOWN_EVENT: 1854 os::signal_raise(SIGTERM); 1855 return TRUE; 1856 break; 1857 default: 1858 break; 1859 } 1860 return FALSE; 1861} 1862 1863/* 1864 * The following code is moved from os.cpp for making this 1865 * code platform specific, which it is by its very nature. 1866 */ 1867 1868// Return maximum OS signal used + 1 for internal use only 1869// Used as exit signal for signal_thread 1870int os::sigexitnum_pd(){ 1871 return NSIG; 1872} 1873 1874// a counter for each possible signal value, including signal_thread exit signal 1875static volatile jint pending_signals[NSIG+1] = { 0 }; 1876static HANDLE sig_sem; 1877 1878void os::signal_init_pd() { 1879 // Initialize signal structures 1880 memset((void*)pending_signals, 0, sizeof(pending_signals)); 1881 1882 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 1883 1884 // Programs embedding the VM do not want it to attempt to receive 1885 // events like CTRL_LOGOFF_EVENT, which are used to implement the 1886 // shutdown hooks mechanism introduced in 1.3. For example, when 1887 // the VM is run as part of a Windows NT service (i.e., a servlet 1888 // engine in a web server), the correct behavior is for any console 1889 // control handler to return FALSE, not TRUE, because the OS's 1890 // "final" handler for such events allows the process to continue if 1891 // it is a service (while terminating it if it is not a service). 1892 // To make this behavior uniform and the mechanism simpler, we 1893 // completely disable the VM's usage of these console events if -Xrs 1894 // (=ReduceSignalUsage) is specified. This means, for example, that 1895 // the CTRL-BREAK thread dump mechanism is also disabled in this 1896 // case. See bugs 4323062, 4345157, and related bugs. 1897 1898 if (!ReduceSignalUsage) { 1899 // Add a CTRL-C handler 1900 SetConsoleCtrlHandler(consoleHandler, TRUE); 1901 } 1902} 1903 1904void os::signal_notify(int signal_number) { 1905 BOOL ret; 1906 1907 Atomic::inc(&pending_signals[signal_number]); 1908 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 1909 assert(ret != 0, "ReleaseSemaphore() failed"); 1910} 1911 1912static int check_pending_signals(bool wait_for_signal) { 1913 DWORD ret; 1914 while (true) { 1915 for (int i = 0; i < NSIG + 1; i++) { 1916 jint n = pending_signals[i]; 1917 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1918 return i; 1919 } 1920 } 1921 if (!wait_for_signal) { 1922 return -1; 1923 } 1924 1925 JavaThread *thread = JavaThread::current(); 1926 1927 ThreadBlockInVM tbivm(thread); 1928 1929 bool threadIsSuspended; 1930 do { 1931 thread->set_suspend_equivalent(); 1932 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1933 ret = ::WaitForSingleObject(sig_sem, INFINITE); 1934 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 1935 1936 // were we externally suspended while we were waiting? 1937 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1938 if (threadIsSuspended) { 1939 // 1940 // The semaphore has been incremented, but while we were waiting 1941 // another thread suspended us. We don't want to continue running 1942 // while suspended because that would surprise the thread that 1943 // suspended us. 1944 // 1945 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 1946 assert(ret != 0, "ReleaseSemaphore() failed"); 1947 1948 thread->java_suspend_self(); 1949 } 1950 } while (threadIsSuspended); 1951 } 1952} 1953 1954int os::signal_lookup() { 1955 return check_pending_signals(false); 1956} 1957 1958int os::signal_wait() { 1959 return check_pending_signals(true); 1960} 1961 1962// Implicit OS exception handling 1963 1964LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) { 1965 JavaThread* thread = JavaThread::current(); 1966 // Save pc in thread 1967#ifdef _M_IA64 1968 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP); 1969 // Set pc to handler 1970 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 1971#elif _M_AMD64 1972 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip); 1973 // Set pc to handler 1974 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 1975#else 1976 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip); 1977 // Set pc to handler 1978 exceptionInfo->ContextRecord->Eip = (LONG)handler; 1979#endif 1980 1981 // Continue the execution 1982 return EXCEPTION_CONTINUE_EXECUTION; 1983} 1984 1985 1986// Used for PostMortemDump 1987extern "C" void safepoints(); 1988extern "C" void find(int x); 1989extern "C" void events(); 1990 1991// According to Windows API documentation, an illegal instruction sequence should generate 1992// the 0xC000001C exception code. However, real world experience shows that occasionnaly 1993// the execution of an illegal instruction can generate the exception code 0xC000001E. This 1994// seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 1995 1996#define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 1997 1998// From "Execution Protection in the Windows Operating System" draft 0.35 1999// Once a system header becomes available, the "real" define should be 2000// included or copied here. 2001#define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2002 2003#define def_excpt(val) #val, val 2004 2005struct siglabel { 2006 char *name; 2007 int number; 2008}; 2009 2010struct siglabel exceptlabels[] = { 2011 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2012 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2013 def_excpt(EXCEPTION_BREAKPOINT), 2014 def_excpt(EXCEPTION_SINGLE_STEP), 2015 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2016 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2017 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2018 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2019 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2020 def_excpt(EXCEPTION_FLT_OVERFLOW), 2021 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2022 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2023 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2024 def_excpt(EXCEPTION_INT_OVERFLOW), 2025 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2026 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2027 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2028 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2029 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2030 def_excpt(EXCEPTION_STACK_OVERFLOW), 2031 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2032 def_excpt(EXCEPTION_GUARD_PAGE), 2033 def_excpt(EXCEPTION_INVALID_HANDLE), 2034 NULL, 0 2035}; 2036 2037const char* os::exception_name(int exception_code, char *buf, size_t size) { 2038 for (int i = 0; exceptlabels[i].name != NULL; i++) { 2039 if (exceptlabels[i].number == exception_code) { 2040 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2041 return buf; 2042 } 2043 } 2044 2045 return NULL; 2046} 2047 2048//----------------------------------------------------------------------------- 2049LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2050 // handle exception caused by idiv; should only happen for -MinInt/-1 2051 // (division by zero is handled explicitly) 2052#ifdef _M_IA64 2053 assert(0, "Fix Handle_IDiv_Exception"); 2054#elif _M_AMD64 2055 PCONTEXT ctx = exceptionInfo->ContextRecord; 2056 address pc = (address)ctx->Rip; 2057 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc)); 2058 assert(pc[0] == 0xF7, "not an idiv opcode"); 2059 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2060 assert(ctx->Rax == min_jint, "unexpected idiv exception"); 2061 // set correct result values and continue after idiv instruction 2062 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2063 ctx->Rax = (DWORD)min_jint; // result 2064 ctx->Rdx = (DWORD)0; // remainder 2065 // Continue the execution 2066#else 2067 PCONTEXT ctx = exceptionInfo->ContextRecord; 2068 address pc = (address)ctx->Eip; 2069 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc)); 2070 assert(pc[0] == 0xF7, "not an idiv opcode"); 2071 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2072 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2073 // set correct result values and continue after idiv instruction 2074 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2075 ctx->Eax = (DWORD)min_jint; // result 2076 ctx->Edx = (DWORD)0; // remainder 2077 // Continue the execution 2078#endif 2079 return EXCEPTION_CONTINUE_EXECUTION; 2080} 2081 2082#ifndef _WIN64 2083//----------------------------------------------------------------------------- 2084LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2085 // handle exception caused by native method modifying control word 2086 PCONTEXT ctx = exceptionInfo->ContextRecord; 2087 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2088 2089 switch (exception_code) { 2090 case EXCEPTION_FLT_DENORMAL_OPERAND: 2091 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2092 case EXCEPTION_FLT_INEXACT_RESULT: 2093 case EXCEPTION_FLT_INVALID_OPERATION: 2094 case EXCEPTION_FLT_OVERFLOW: 2095 case EXCEPTION_FLT_STACK_CHECK: 2096 case EXCEPTION_FLT_UNDERFLOW: 2097 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2098 if (fp_control_word != ctx->FloatSave.ControlWord) { 2099 // Restore FPCW and mask out FLT exceptions 2100 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2101 // Mask out pending FLT exceptions 2102 ctx->FloatSave.StatusWord &= 0xffffff00; 2103 return EXCEPTION_CONTINUE_EXECUTION; 2104 } 2105 } 2106 2107 if (prev_uef_handler != NULL) { 2108 // We didn't handle this exception so pass it to the previous 2109 // UnhandledExceptionFilter. 2110 return (prev_uef_handler)(exceptionInfo); 2111 } 2112 2113 return EXCEPTION_CONTINUE_SEARCH; 2114} 2115#else //_WIN64 2116/* 2117 On Windows, the mxcsr control bits are non-volatile across calls 2118 See also CR 6192333 2119 If EXCEPTION_FLT_* happened after some native method modified 2120 mxcsr - it is not a jvm fault. 2121 However should we decide to restore of mxcsr after a faulty 2122 native method we can uncomment following code 2123 jint MxCsr = INITIAL_MXCSR; 2124 // we can't use StubRoutines::addr_mxcsr_std() 2125 // because in Win64 mxcsr is not saved there 2126 if (MxCsr != ctx->MxCsr) { 2127 ctx->MxCsr = MxCsr; 2128 return EXCEPTION_CONTINUE_EXECUTION; 2129 } 2130 2131*/ 2132#endif //_WIN64 2133 2134 2135// Fatal error reporting is single threaded so we can make this a 2136// static and preallocated. If it's more than MAX_PATH silently ignore 2137// it. 2138static char saved_error_file[MAX_PATH] = {0}; 2139 2140void os::set_error_file(const char *logfile) { 2141 if (strlen(logfile) <= MAX_PATH) { 2142 strncpy(saved_error_file, logfile, MAX_PATH); 2143 } 2144} 2145 2146static inline void report_error(Thread* t, DWORD exception_code, 2147 address addr, void* siginfo, void* context) { 2148 VMError err(t, exception_code, addr, siginfo, context); 2149 err.report_and_die(); 2150 2151 // If UseOsErrorReporting, this will return here and save the error file 2152 // somewhere where we can find it in the minidump. 2153} 2154 2155//----------------------------------------------------------------------------- 2156LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2157 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2158 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2159#ifdef _M_IA64 2160 address pc = (address) exceptionInfo->ContextRecord->StIIP; 2161#elif _M_AMD64 2162 address pc = (address) exceptionInfo->ContextRecord->Rip; 2163#else 2164 address pc = (address) exceptionInfo->ContextRecord->Eip; 2165#endif 2166 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 2167 2168#ifndef _WIN64 2169 // Execution protection violation - win32 running on AMD64 only 2170 // Handled first to avoid misdiagnosis as a "normal" access violation; 2171 // This is safe to do because we have a new/unique ExceptionInformation 2172 // code for this condition. 2173 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2174 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2175 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2176 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2177 2178 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2179 int page_size = os::vm_page_size(); 2180 2181 // Make sure the pc and the faulting address are sane. 2182 // 2183 // If an instruction spans a page boundary, and the page containing 2184 // the beginning of the instruction is executable but the following 2185 // page is not, the pc and the faulting address might be slightly 2186 // different - we still want to unguard the 2nd page in this case. 2187 // 2188 // 15 bytes seems to be a (very) safe value for max instruction size. 2189 bool pc_is_near_addr = 2190 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2191 bool instr_spans_page_boundary = 2192 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2193 (intptr_t) page_size) > 0); 2194 2195 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2196 static volatile address last_addr = 2197 (address) os::non_memory_address_word(); 2198 2199 // In conservative mode, don't unguard unless the address is in the VM 2200 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2201 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2202 2203 // Set memory to RWX and retry 2204 address page_start = 2205 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2206 bool res = os::protect_memory((char*) page_start, page_size, 2207 os::MEM_PROT_RWX); 2208 2209 if (PrintMiscellaneous && Verbose) { 2210 char buf[256]; 2211 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 2212 "at " INTPTR_FORMAT 2213 ", unguarding " INTPTR_FORMAT ": %s", addr, 2214 page_start, (res ? "success" : strerror(errno))); 2215 tty->print_raw_cr(buf); 2216 } 2217 2218 // Set last_addr so if we fault again at the same address, we don't 2219 // end up in an endless loop. 2220 // 2221 // There are two potential complications here. Two threads trapping 2222 // at the same address at the same time could cause one of the 2223 // threads to think it already unguarded, and abort the VM. Likely 2224 // very rare. 2225 // 2226 // The other race involves two threads alternately trapping at 2227 // different addresses and failing to unguard the page, resulting in 2228 // an endless loop. This condition is probably even more unlikely 2229 // than the first. 2230 // 2231 // Although both cases could be avoided by using locks or thread 2232 // local last_addr, these solutions are unnecessary complication: 2233 // this handler is a best-effort safety net, not a complete solution. 2234 // It is disabled by default and should only be used as a workaround 2235 // in case we missed any no-execute-unsafe VM code. 2236 2237 last_addr = addr; 2238 2239 return EXCEPTION_CONTINUE_EXECUTION; 2240 } 2241 } 2242 2243 // Last unguard failed or not unguarding 2244 tty->print_raw_cr("Execution protection violation"); 2245 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2246 exceptionInfo->ContextRecord); 2247 return EXCEPTION_CONTINUE_SEARCH; 2248 } 2249 } 2250#endif // _WIN64 2251 2252 // Check to see if we caught the safepoint code in the 2253 // process of write protecting the memory serialization page. 2254 // It write enables the page immediately after protecting it 2255 // so just return. 2256 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { 2257 JavaThread* thread = (JavaThread*) t; 2258 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2259 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2260 if ( os::is_memory_serialize_page(thread, addr) ) { 2261 // Block current thread until the memory serialize page permission restored. 2262 os::block_on_serialize_page_trap(); 2263 return EXCEPTION_CONTINUE_EXECUTION; 2264 } 2265 } 2266 2267 2268 if (t != NULL && t->is_Java_thread()) { 2269 JavaThread* thread = (JavaThread*) t; 2270 bool in_java = thread->thread_state() == _thread_in_Java; 2271 2272 // Handle potential stack overflows up front. 2273 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2274 if (os::uses_stack_guard_pages()) { 2275#ifdef _M_IA64 2276 // 2277 // If it's a legal stack address continue, Windows will map it in. 2278 // 2279 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2280 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2281 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) 2282 return EXCEPTION_CONTINUE_EXECUTION; 2283 2284 // The register save area is the same size as the memory stack 2285 // and starts at the page just above the start of the memory stack. 2286 // If we get a fault in this area, we've run out of register 2287 // stack. If we are in java, try throwing a stack overflow exception. 2288 if (addr > thread->stack_base() && 2289 addr <= (thread->stack_base()+thread->stack_size()) ) { 2290 char buf[256]; 2291 jio_snprintf(buf, sizeof(buf), 2292 "Register stack overflow, addr:%p, stack_base:%p\n", 2293 addr, thread->stack_base() ); 2294 tty->print_raw_cr(buf); 2295 // If not in java code, return and hope for the best. 2296 return in_java ? Handle_Exception(exceptionInfo, 2297 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2298 : EXCEPTION_CONTINUE_EXECUTION; 2299 } 2300#endif 2301 if (thread->stack_yellow_zone_enabled()) { 2302 // Yellow zone violation. The o/s has unprotected the first yellow 2303 // zone page for us. Note: must call disable_stack_yellow_zone to 2304 // update the enabled status, even if the zone contains only one page. 2305 thread->disable_stack_yellow_zone(); 2306 // If not in java code, return and hope for the best. 2307 return in_java ? Handle_Exception(exceptionInfo, 2308 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2309 : EXCEPTION_CONTINUE_EXECUTION; 2310 } else { 2311 // Fatal red zone violation. 2312 thread->disable_stack_red_zone(); 2313 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2314 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2315 exceptionInfo->ContextRecord); 2316 return EXCEPTION_CONTINUE_SEARCH; 2317 } 2318 } else if (in_java) { 2319 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2320 // a one-time-only guard page, which it has released to us. The next 2321 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2322 return Handle_Exception(exceptionInfo, 2323 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2324 } else { 2325 // Can only return and hope for the best. Further stack growth will 2326 // result in an ACCESS_VIOLATION. 2327 return EXCEPTION_CONTINUE_EXECUTION; 2328 } 2329 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2330 // Either stack overflow or null pointer exception. 2331 if (in_java) { 2332 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2333 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2334 address stack_end = thread->stack_base() - thread->stack_size(); 2335 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2336 // Stack overflow. 2337 assert(!os::uses_stack_guard_pages(), 2338 "should be caught by red zone code above."); 2339 return Handle_Exception(exceptionInfo, 2340 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2341 } 2342 // 2343 // Check for safepoint polling and implicit null 2344 // We only expect null pointers in the stubs (vtable) 2345 // the rest are checked explicitly now. 2346 // 2347 CodeBlob* cb = CodeCache::find_blob(pc); 2348 if (cb != NULL) { 2349 if (os::is_poll_address(addr)) { 2350 address stub = SharedRuntime::get_poll_stub(pc); 2351 return Handle_Exception(exceptionInfo, stub); 2352 } 2353 } 2354 { 2355#ifdef _WIN64 2356 // 2357 // If it's a legal stack address map the entire region in 2358 // 2359 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2360 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2361 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) { 2362 addr = (address)((uintptr_t)addr & 2363 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2364 os::commit_memory((char *)addr, thread->stack_base() - addr, 2365 false ); 2366 return EXCEPTION_CONTINUE_EXECUTION; 2367 } 2368 else 2369#endif 2370 { 2371 // Null pointer exception. 2372#ifdef _M_IA64 2373 // We catch register stack overflows in compiled code by doing 2374 // an explicit compare and executing a st8(G0, G0) if the 2375 // BSP enters into our guard area. We test for the overflow 2376 // condition and fall into the normal null pointer exception 2377 // code if BSP hasn't overflowed. 2378 if ( in_java ) { 2379 if(thread->register_stack_overflow()) { 2380 assert((address)exceptionInfo->ContextRecord->IntS3 == 2381 thread->register_stack_limit(), 2382 "GR7 doesn't contain register_stack_limit"); 2383 // Disable the yellow zone which sets the state that 2384 // we've got a stack overflow problem. 2385 if (thread->stack_yellow_zone_enabled()) { 2386 thread->disable_stack_yellow_zone(); 2387 } 2388 // Give us some room to process the exception 2389 thread->disable_register_stack_guard(); 2390 // Update GR7 with the new limit so we can continue running 2391 // compiled code. 2392 exceptionInfo->ContextRecord->IntS3 = 2393 (ULONGLONG)thread->register_stack_limit(); 2394 return Handle_Exception(exceptionInfo, 2395 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2396 } else { 2397 // 2398 // Check for implicit null 2399 // We only expect null pointers in the stubs (vtable) 2400 // the rest are checked explicitly now. 2401 // 2402 if (((uintptr_t)addr) < os::vm_page_size() ) { 2403 // an access to the first page of VM--assume it is a null pointer 2404 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2405 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2406 } 2407 } 2408 } // in_java 2409 2410 // IA64 doesn't use implicit null checking yet. So we shouldn't 2411 // get here. 2412 tty->print_raw_cr("Access violation, possible null pointer exception"); 2413 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2414 exceptionInfo->ContextRecord); 2415 return EXCEPTION_CONTINUE_SEARCH; 2416#else /* !IA64 */ 2417 2418 // Windows 98 reports faulting addresses incorrectly 2419 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2420 !os::win32::is_nt()) { 2421 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2422 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2423 } 2424 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2425 exceptionInfo->ContextRecord); 2426 return EXCEPTION_CONTINUE_SEARCH; 2427#endif 2428 } 2429 } 2430 } 2431 2432#ifdef _WIN64 2433 // Special care for fast JNI field accessors. 2434 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2435 // in and the heap gets shrunk before the field access. 2436 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2437 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2438 if (addr != (address)-1) { 2439 return Handle_Exception(exceptionInfo, addr); 2440 } 2441 } 2442#endif 2443 2444#ifdef _WIN64 2445 // Windows will sometimes generate an access violation 2446 // when we call malloc. Since we use VectoredExceptions 2447 // on 64 bit platforms, we see this exception. We must 2448 // pass this exception on so Windows can recover. 2449 // We check to see if the pc of the fault is in NTDLL.DLL 2450 // if so, we pass control on to Windows for handling. 2451 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH; 2452#endif 2453 2454 // Stack overflow or null pointer exception in native code. 2455 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2456 exceptionInfo->ContextRecord); 2457 return EXCEPTION_CONTINUE_SEARCH; 2458 } 2459 2460 if (in_java) { 2461 switch (exception_code) { 2462 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2463 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2464 2465 case EXCEPTION_INT_OVERFLOW: 2466 return Handle_IDiv_Exception(exceptionInfo); 2467 2468 } // switch 2469 } 2470#ifndef _WIN64 2471 if ((thread->thread_state() == _thread_in_Java) || 2472 (thread->thread_state() == _thread_in_native) ) 2473 { 2474 LONG result=Handle_FLT_Exception(exceptionInfo); 2475 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2476 } 2477#endif //_WIN64 2478 } 2479 2480 if (exception_code != EXCEPTION_BREAKPOINT) { 2481#ifndef _WIN64 2482 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2483 exceptionInfo->ContextRecord); 2484#else 2485 // Itanium Windows uses a VectoredExceptionHandler 2486 // Which means that C++ programatic exception handlers (try/except) 2487 // will get here. Continue the search for the right except block if 2488 // the exception code is not a fatal code. 2489 switch ( exception_code ) { 2490 case EXCEPTION_ACCESS_VIOLATION: 2491 case EXCEPTION_STACK_OVERFLOW: 2492 case EXCEPTION_ILLEGAL_INSTRUCTION: 2493 case EXCEPTION_ILLEGAL_INSTRUCTION_2: 2494 case EXCEPTION_INT_OVERFLOW: 2495 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2496 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2497 exceptionInfo->ContextRecord); 2498 } 2499 break; 2500 default: 2501 break; 2502 } 2503#endif 2504 } 2505 return EXCEPTION_CONTINUE_SEARCH; 2506} 2507 2508#ifndef _WIN64 2509// Special care for fast JNI accessors. 2510// jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2511// the heap gets shrunk before the field access. 2512// Need to install our own structured exception handler since native code may 2513// install its own. 2514LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2515 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2516 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2517 address pc = (address) exceptionInfo->ContextRecord->Eip; 2518 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2519 if (addr != (address)-1) { 2520 return Handle_Exception(exceptionInfo, addr); 2521 } 2522 } 2523 return EXCEPTION_CONTINUE_SEARCH; 2524} 2525 2526#define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \ 2527Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \ 2528 __try { \ 2529 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \ 2530 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \ 2531 } \ 2532 return 0; \ 2533} 2534 2535DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2536DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2537DEFINE_FAST_GETFIELD(jchar, char, Char) 2538DEFINE_FAST_GETFIELD(jshort, short, Short) 2539DEFINE_FAST_GETFIELD(jint, int, Int) 2540DEFINE_FAST_GETFIELD(jlong, long, Long) 2541DEFINE_FAST_GETFIELD(jfloat, float, Float) 2542DEFINE_FAST_GETFIELD(jdouble, double, Double) 2543 2544address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2545 switch (type) { 2546 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2547 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2548 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2549 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2550 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2551 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2552 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2553 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2554 default: ShouldNotReachHere(); 2555 } 2556 return (address)-1; 2557} 2558#endif 2559 2560// Virtual Memory 2561 2562int os::vm_page_size() { return os::win32::vm_page_size(); } 2563int os::vm_allocation_granularity() { 2564 return os::win32::vm_allocation_granularity(); 2565} 2566 2567// Windows large page support is available on Windows 2003. In order to use 2568// large page memory, the administrator must first assign additional privilege 2569// to the user: 2570// + select Control Panel -> Administrative Tools -> Local Security Policy 2571// + select Local Policies -> User Rights Assignment 2572// + double click "Lock pages in memory", add users and/or groups 2573// + reboot 2574// Note the above steps are needed for administrator as well, as administrators 2575// by default do not have the privilege to lock pages in memory. 2576// 2577// Note about Windows 2003: although the API supports committing large page 2578// memory on a page-by-page basis and VirtualAlloc() returns success under this 2579// scenario, I found through experiment it only uses large page if the entire 2580// memory region is reserved and committed in a single VirtualAlloc() call. 2581// This makes Windows large page support more or less like Solaris ISM, in 2582// that the entire heap must be committed upfront. This probably will change 2583// in the future, if so the code below needs to be revisited. 2584 2585#ifndef MEM_LARGE_PAGES 2586#define MEM_LARGE_PAGES 0x20000000 2587#endif 2588 2589// GetLargePageMinimum is only available on Windows 2003. The other functions 2590// are available on NT but not on Windows 98/Me. We have to resolve them at 2591// runtime. 2592typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void); 2593typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type) 2594 (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 2595typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE); 2596typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID); 2597 2598static GetLargePageMinimum_func_type _GetLargePageMinimum; 2599static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges; 2600static OpenProcessToken_func_type _OpenProcessToken; 2601static LookupPrivilegeValue_func_type _LookupPrivilegeValue; 2602 2603static HINSTANCE _kernel32; 2604static HINSTANCE _advapi32; 2605static HANDLE _hProcess; 2606static HANDLE _hToken; 2607 2608static size_t _large_page_size = 0; 2609 2610static bool resolve_functions_for_large_page_init() { 2611 _kernel32 = LoadLibrary("kernel32.dll"); 2612 if (_kernel32 == NULL) return false; 2613 2614 _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type, 2615 GetProcAddress(_kernel32, "GetLargePageMinimum")); 2616 if (_GetLargePageMinimum == NULL) return false; 2617 2618 _advapi32 = LoadLibrary("advapi32.dll"); 2619 if (_advapi32 == NULL) return false; 2620 2621 _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type, 2622 GetProcAddress(_advapi32, "AdjustTokenPrivileges")); 2623 _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type, 2624 GetProcAddress(_advapi32, "OpenProcessToken")); 2625 _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type, 2626 GetProcAddress(_advapi32, "LookupPrivilegeValueA")); 2627 return _AdjustTokenPrivileges != NULL && 2628 _OpenProcessToken != NULL && 2629 _LookupPrivilegeValue != NULL; 2630} 2631 2632static bool request_lock_memory_privilege() { 2633 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2634 os::current_process_id()); 2635 2636 LUID luid; 2637 if (_hProcess != NULL && 2638 _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2639 _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2640 2641 TOKEN_PRIVILEGES tp; 2642 tp.PrivilegeCount = 1; 2643 tp.Privileges[0].Luid = luid; 2644 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2645 2646 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2647 // privilege. Check GetLastError() too. See MSDN document. 2648 if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2649 (GetLastError() == ERROR_SUCCESS)) { 2650 return true; 2651 } 2652 } 2653 2654 return false; 2655} 2656 2657static void cleanup_after_large_page_init() { 2658 _GetLargePageMinimum = NULL; 2659 _AdjustTokenPrivileges = NULL; 2660 _OpenProcessToken = NULL; 2661 _LookupPrivilegeValue = NULL; 2662 if (_kernel32) FreeLibrary(_kernel32); 2663 _kernel32 = NULL; 2664 if (_advapi32) FreeLibrary(_advapi32); 2665 _advapi32 = NULL; 2666 if (_hProcess) CloseHandle(_hProcess); 2667 _hProcess = NULL; 2668 if (_hToken) CloseHandle(_hToken); 2669 _hToken = NULL; 2670} 2671 2672bool os::large_page_init() { 2673 if (!UseLargePages) return false; 2674 2675 // print a warning if any large page related flag is specified on command line 2676 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2677 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2678 bool success = false; 2679 2680# define WARN(msg) if (warn_on_failure) { warning(msg); } 2681 if (resolve_functions_for_large_page_init()) { 2682 if (request_lock_memory_privilege()) { 2683 size_t s = _GetLargePageMinimum(); 2684 if (s) { 2685#if defined(IA32) || defined(AMD64) 2686 if (s > 4*M || LargePageSizeInBytes > 4*M) { 2687 WARN("JVM cannot use large pages bigger than 4mb."); 2688 } else { 2689#endif 2690 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 2691 _large_page_size = LargePageSizeInBytes; 2692 } else { 2693 _large_page_size = s; 2694 } 2695 success = true; 2696#if defined(IA32) || defined(AMD64) 2697 } 2698#endif 2699 } else { 2700 WARN("Large page is not supported by the processor."); 2701 } 2702 } else { 2703 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 2704 } 2705 } else { 2706 WARN("Large page is not supported by the operating system."); 2707 } 2708#undef WARN 2709 2710 const size_t default_page_size = (size_t) vm_page_size(); 2711 if (success && _large_page_size > default_page_size) { 2712 _page_sizes[0] = _large_page_size; 2713 _page_sizes[1] = default_page_size; 2714 _page_sizes[2] = 0; 2715 } 2716 2717 cleanup_after_large_page_init(); 2718 return success; 2719} 2720 2721// On win32, one cannot release just a part of reserved memory, it's an 2722// all or nothing deal. When we split a reservation, we must break the 2723// reservation into two reservations. 2724void os::split_reserved_memory(char *base, size_t size, size_t split, 2725 bool realloc) { 2726 if (size > 0) { 2727 release_memory(base, size); 2728 if (realloc) { 2729 reserve_memory(split, base); 2730 } 2731 if (size != split) { 2732 reserve_memory(size - split, base + split); 2733 } 2734 } 2735} 2736 2737char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 2738 assert((size_t)addr % os::vm_allocation_granularity() == 0, 2739 "reserve alignment"); 2740 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size"); 2741 char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 2742 assert(res == NULL || addr == NULL || addr == res, 2743 "Unexpected address from reserve."); 2744 return res; 2745} 2746 2747// Reserve memory at an arbitrary address, only if that area is 2748// available (and not reserved for something else). 2749char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2750 // Windows os::reserve_memory() fails of the requested address range is 2751 // not avilable. 2752 return reserve_memory(bytes, requested_addr); 2753} 2754 2755size_t os::large_page_size() { 2756 return _large_page_size; 2757} 2758 2759bool os::can_commit_large_page_memory() { 2760 // Windows only uses large page memory when the entire region is reserved 2761 // and committed in a single VirtualAlloc() call. This may change in the 2762 // future, but with Windows 2003 it's not possible to commit on demand. 2763 return false; 2764} 2765 2766bool os::can_execute_large_page_memory() { 2767 return true; 2768} 2769 2770char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) { 2771 2772 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 2773 2774 if (UseLargePagesIndividualAllocation) { 2775 if (TracePageSizes && Verbose) { 2776 tty->print_cr("Reserving large pages individually."); 2777 } 2778 char * p_buf; 2779 // first reserve enough address space in advance since we want to be 2780 // able to break a single contiguous virtual address range into multiple 2781 // large page commits but WS2003 does not allow reserving large page space 2782 // so we just use 4K pages for reserve, this gives us a legal contiguous 2783 // address space. then we will deallocate that reservation, and re alloc 2784 // using large pages 2785 const size_t size_of_reserve = bytes + _large_page_size; 2786 if (bytes > size_of_reserve) { 2787 // Overflowed. 2788 warning("Individually allocated large pages failed, " 2789 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 2790 return NULL; 2791 } 2792 p_buf = (char *) VirtualAlloc(addr, 2793 size_of_reserve, // size of Reserve 2794 MEM_RESERVE, 2795 PAGE_READWRITE); 2796 // If reservation failed, return NULL 2797 if (p_buf == NULL) return NULL; 2798 2799 release_memory(p_buf, bytes + _large_page_size); 2800 // round up to page boundary. If the size_of_reserve did not 2801 // overflow and the reservation did not fail, this align up 2802 // should not overflow. 2803 p_buf = (char *) align_size_up((size_t)p_buf, _large_page_size); 2804 2805 // now go through and allocate one page at a time until all bytes are 2806 // allocated 2807 size_t bytes_remaining = align_size_up(bytes, _large_page_size); 2808 // An overflow of align_size_up() would have been caught above 2809 // in the calculation of size_of_reserve. 2810 char * next_alloc_addr = p_buf; 2811 2812#ifdef ASSERT 2813 // Variable for the failure injection 2814 long ran_num = os::random(); 2815 size_t fail_after = ran_num % bytes; 2816#endif 2817 2818 while (bytes_remaining) { 2819 size_t bytes_to_rq = MIN2(bytes_remaining, _large_page_size); 2820 // Note allocate and commit 2821 char * p_new; 2822 2823#ifdef ASSERT 2824 bool inject_error = LargePagesIndividualAllocationInjectError && 2825 (bytes_remaining <= fail_after); 2826#else 2827 const bool inject_error = false; 2828#endif 2829 2830 if (inject_error) { 2831 p_new = NULL; 2832 } else { 2833 p_new = (char *) VirtualAlloc(next_alloc_addr, 2834 bytes_to_rq, 2835 MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES, 2836 prot); 2837 } 2838 2839 if (p_new == NULL) { 2840 // Free any allocated pages 2841 if (next_alloc_addr > p_buf) { 2842 // Some memory was committed so release it. 2843 size_t bytes_to_release = bytes - bytes_remaining; 2844 release_memory(p_buf, bytes_to_release); 2845 } 2846#ifdef ASSERT 2847 if (UseLargePagesIndividualAllocation && 2848 LargePagesIndividualAllocationInjectError) { 2849 if (TracePageSizes && Verbose) { 2850 tty->print_cr("Reserving large pages individually failed."); 2851 } 2852 } 2853#endif 2854 return NULL; 2855 } 2856 bytes_remaining -= bytes_to_rq; 2857 next_alloc_addr += bytes_to_rq; 2858 } 2859 2860 return p_buf; 2861 2862 } else { 2863 // normal policy just allocate it all at once 2864 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 2865 char * res = (char *)VirtualAlloc(NULL, bytes, flag, prot); 2866 return res; 2867 } 2868} 2869 2870bool os::release_memory_special(char* base, size_t bytes) { 2871 return release_memory(base, bytes); 2872} 2873 2874void os::print_statistics() { 2875} 2876 2877bool os::commit_memory(char* addr, size_t bytes, bool exec) { 2878 if (bytes == 0) { 2879 // Don't bother the OS with noops. 2880 return true; 2881 } 2882 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 2883 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 2884 // Don't attempt to print anything if the OS call fails. We're 2885 // probably low on resources, so the print itself may cause crashes. 2886 bool result = VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) != 0; 2887 if (result != NULL && exec) { 2888 DWORD oldprot; 2889 // Windows doc says to use VirtualProtect to get execute permissions 2890 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot) != 0; 2891 } else { 2892 return result; 2893 } 2894} 2895 2896bool os::commit_memory(char* addr, size_t size, size_t alignment_hint, 2897 bool exec) { 2898 return commit_memory(addr, size, exec); 2899} 2900 2901bool os::uncommit_memory(char* addr, size_t bytes) { 2902 if (bytes == 0) { 2903 // Don't bother the OS with noops. 2904 return true; 2905 } 2906 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 2907 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 2908 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0; 2909} 2910 2911bool os::release_memory(char* addr, size_t bytes) { 2912 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 2913} 2914 2915bool os::create_stack_guard_pages(char* addr, size_t size) { 2916 return os::commit_memory(addr, size); 2917} 2918 2919bool os::remove_stack_guard_pages(char* addr, size_t size) { 2920 return os::uncommit_memory(addr, size); 2921} 2922 2923// Set protections specified 2924bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2925 bool is_committed) { 2926 unsigned int p = 0; 2927 switch (prot) { 2928 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 2929 case MEM_PROT_READ: p = PAGE_READONLY; break; 2930 case MEM_PROT_RW: p = PAGE_READWRITE; break; 2931 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 2932 default: 2933 ShouldNotReachHere(); 2934 } 2935 2936 DWORD old_status; 2937 2938 // Strange enough, but on Win32 one can change protection only for committed 2939 // memory, not a big deal anyway, as bytes less or equal than 64K 2940 if (!is_committed && !commit_memory(addr, bytes, prot == MEM_PROT_RWX)) { 2941 fatal("cannot commit protection page"); 2942 } 2943 // One cannot use os::guard_memory() here, as on Win32 guard page 2944 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 2945 // 2946 // Pages in the region become guard pages. Any attempt to access a guard page 2947 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 2948 // the guard page status. Guard pages thus act as a one-time access alarm. 2949 return VirtualProtect(addr, bytes, p, &old_status) != 0; 2950} 2951 2952bool os::guard_memory(char* addr, size_t bytes) { 2953 DWORD old_status; 2954 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 2955} 2956 2957bool os::unguard_memory(char* addr, size_t bytes) { 2958 DWORD old_status; 2959 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 2960} 2961 2962void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 2963void os::free_memory(char *addr, size_t bytes) { } 2964void os::numa_make_global(char *addr, size_t bytes) { } 2965void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 2966bool os::numa_topology_changed() { return false; } 2967size_t os::numa_get_groups_num() { return 1; } 2968int os::numa_get_group_id() { return 0; } 2969size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2970 if (size > 0) { 2971 ids[0] = 0; 2972 return 1; 2973 } 2974 return 0; 2975} 2976 2977bool os::get_page_info(char *start, page_info* info) { 2978 return false; 2979} 2980 2981char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2982 return end; 2983} 2984 2985char* os::non_memory_address_word() { 2986 // Must never look like an address returned by reserve_memory, 2987 // even in its subfields (as defined by the CPU immediate fields, 2988 // if the CPU splits constants across multiple instructions). 2989 return (char*)-1; 2990} 2991 2992#define MAX_ERROR_COUNT 100 2993#define SYS_THREAD_ERROR 0xffffffffUL 2994 2995void os::pd_start_thread(Thread* thread) { 2996 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 2997 // Returns previous suspend state: 2998 // 0: Thread was not suspended 2999 // 1: Thread is running now 3000 // >1: Thread is still suspended. 3001 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3002} 3003 3004class HighResolutionInterval { 3005 // The default timer resolution seems to be 10 milliseconds. 3006 // (Where is this written down?) 3007 // If someone wants to sleep for only a fraction of the default, 3008 // then we set the timer resolution down to 1 millisecond for 3009 // the duration of their interval. 3010 // We carefully set the resolution back, since otherwise we 3011 // seem to incur an overhead (3%?) that we don't need. 3012 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 3013 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 3014 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 3015 // timeBeginPeriod() if the relative error exceeded some threshold. 3016 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 3017 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 3018 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 3019 // resolution timers running. 3020private: 3021 jlong resolution; 3022public: 3023 HighResolutionInterval(jlong ms) { 3024 resolution = ms % 10L; 3025 if (resolution != 0) { 3026 MMRESULT result = timeBeginPeriod(1L); 3027 } 3028 } 3029 ~HighResolutionInterval() { 3030 if (resolution != 0) { 3031 MMRESULT result = timeEndPeriod(1L); 3032 } 3033 resolution = 0L; 3034 } 3035}; 3036 3037int os::sleep(Thread* thread, jlong ms, bool interruptable) { 3038 jlong limit = (jlong) MAXDWORD; 3039 3040 while(ms > limit) { 3041 int res; 3042 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) 3043 return res; 3044 ms -= limit; 3045 } 3046 3047 assert(thread == Thread::current(), "thread consistency check"); 3048 OSThread* osthread = thread->osthread(); 3049 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 3050 int result; 3051 if (interruptable) { 3052 assert(thread->is_Java_thread(), "must be java thread"); 3053 JavaThread *jt = (JavaThread *) thread; 3054 ThreadBlockInVM tbivm(jt); 3055 3056 jt->set_suspend_equivalent(); 3057 // cleared by handle_special_suspend_equivalent_condition() or 3058 // java_suspend_self() via check_and_wait_while_suspended() 3059 3060 HANDLE events[1]; 3061 events[0] = osthread->interrupt_event(); 3062 HighResolutionInterval *phri=NULL; 3063 if(!ForceTimeHighResolution) 3064 phri = new HighResolutionInterval( ms ); 3065 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 3066 result = OS_TIMEOUT; 3067 } else { 3068 ResetEvent(osthread->interrupt_event()); 3069 osthread->set_interrupted(false); 3070 result = OS_INTRPT; 3071 } 3072 delete phri; //if it is NULL, harmless 3073 3074 // were we externally suspended while we were waiting? 3075 jt->check_and_wait_while_suspended(); 3076 } else { 3077 assert(!thread->is_Java_thread(), "must not be java thread"); 3078 Sleep((long) ms); 3079 result = OS_TIMEOUT; 3080 } 3081 return result; 3082} 3083 3084// Sleep forever; naked call to OS-specific sleep; use with CAUTION 3085void os::infinite_sleep() { 3086 while (true) { // sleep forever ... 3087 Sleep(100000); // ... 100 seconds at a time 3088 } 3089} 3090 3091typedef BOOL (WINAPI * STTSignature)(void) ; 3092 3093os::YieldResult os::NakedYield() { 3094 // Use either SwitchToThread() or Sleep(0) 3095 // Consider passing back the return value from SwitchToThread(). 3096 // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread. 3097 // In that case we revert to Sleep(0). 3098 static volatile STTSignature stt = (STTSignature) 1 ; 3099 3100 if (stt == ((STTSignature) 1)) { 3101 stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ; 3102 // It's OK if threads race during initialization as the operation above is idempotent. 3103 } 3104 if (stt != NULL) { 3105 return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ; 3106 } else { 3107 Sleep (0) ; 3108 } 3109 return os::YIELD_UNKNOWN ; 3110} 3111 3112void os::yield() { os::NakedYield(); } 3113 3114void os::yield_all(int attempts) { 3115 // Yields to all threads, including threads with lower priorities 3116 Sleep(1); 3117} 3118 3119// Win32 only gives you access to seven real priorities at a time, 3120// so we compress Java's ten down to seven. It would be better 3121// if we dynamically adjusted relative priorities. 3122 3123int os::java_to_os_priority[MaxPriority + 1] = { 3124 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3125 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3126 THREAD_PRIORITY_LOWEST, // 2 3127 THREAD_PRIORITY_BELOW_NORMAL, // 3 3128 THREAD_PRIORITY_BELOW_NORMAL, // 4 3129 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3130 THREAD_PRIORITY_NORMAL, // 6 3131 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3132 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3133 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3134 THREAD_PRIORITY_HIGHEST // 10 MaxPriority 3135}; 3136 3137int prio_policy1[MaxPriority + 1] = { 3138 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3139 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3140 THREAD_PRIORITY_LOWEST, // 2 3141 THREAD_PRIORITY_BELOW_NORMAL, // 3 3142 THREAD_PRIORITY_BELOW_NORMAL, // 4 3143 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3144 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3145 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3146 THREAD_PRIORITY_HIGHEST, // 8 3147 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3148 THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority 3149}; 3150 3151static int prio_init() { 3152 // If ThreadPriorityPolicy is 1, switch tables 3153 if (ThreadPriorityPolicy == 1) { 3154 int i; 3155 for (i = 0; i < MaxPriority + 1; i++) { 3156 os::java_to_os_priority[i] = prio_policy1[i]; 3157 } 3158 } 3159 return 0; 3160} 3161 3162OSReturn os::set_native_priority(Thread* thread, int priority) { 3163 if (!UseThreadPriorities) return OS_OK; 3164 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3165 return ret ? OS_OK : OS_ERR; 3166} 3167 3168OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) { 3169 if ( !UseThreadPriorities ) { 3170 *priority_ptr = java_to_os_priority[NormPriority]; 3171 return OS_OK; 3172 } 3173 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3174 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3175 assert(false, "GetThreadPriority failed"); 3176 return OS_ERR; 3177 } 3178 *priority_ptr = os_prio; 3179 return OS_OK; 3180} 3181 3182 3183// Hint to the underlying OS that a task switch would not be good. 3184// Void return because it's a hint and can fail. 3185void os::hint_no_preempt() {} 3186 3187void os::interrupt(Thread* thread) { 3188 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3189 "possibility of dangling Thread pointer"); 3190 3191 OSThread* osthread = thread->osthread(); 3192 osthread->set_interrupted(true); 3193 // More than one thread can get here with the same value of osthread, 3194 // resulting in multiple notifications. We do, however, want the store 3195 // to interrupted() to be visible to other threads before we post 3196 // the interrupt event. 3197 OrderAccess::release(); 3198 SetEvent(osthread->interrupt_event()); 3199 // For JSR166: unpark after setting status 3200 if (thread->is_Java_thread()) 3201 ((JavaThread*)thread)->parker()->unpark(); 3202 3203 ParkEvent * ev = thread->_ParkEvent ; 3204 if (ev != NULL) ev->unpark() ; 3205 3206} 3207 3208 3209bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3210 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3211 "possibility of dangling Thread pointer"); 3212 3213 OSThread* osthread = thread->osthread(); 3214 bool interrupted; 3215 interrupted = osthread->interrupted(); 3216 if (clear_interrupted == true) { 3217 osthread->set_interrupted(false); 3218 ResetEvent(osthread->interrupt_event()); 3219 } // Otherwise leave the interrupted state alone 3220 3221 return interrupted; 3222} 3223 3224// Get's a pc (hint) for a running thread. Currently used only for profiling. 3225ExtendedPC os::get_thread_pc(Thread* thread) { 3226 CONTEXT context; 3227 context.ContextFlags = CONTEXT_CONTROL; 3228 HANDLE handle = thread->osthread()->thread_handle(); 3229#ifdef _M_IA64 3230 assert(0, "Fix get_thread_pc"); 3231 return ExtendedPC(NULL); 3232#else 3233 if (GetThreadContext(handle, &context)) { 3234#ifdef _M_AMD64 3235 return ExtendedPC((address) context.Rip); 3236#else 3237 return ExtendedPC((address) context.Eip); 3238#endif 3239 } else { 3240 return ExtendedPC(NULL); 3241 } 3242#endif 3243} 3244 3245// GetCurrentThreadId() returns DWORD 3246intx os::current_thread_id() { return GetCurrentThreadId(); } 3247 3248static int _initial_pid = 0; 3249 3250int os::current_process_id() 3251{ 3252 return (_initial_pid ? _initial_pid : _getpid()); 3253} 3254 3255int os::win32::_vm_page_size = 0; 3256int os::win32::_vm_allocation_granularity = 0; 3257int os::win32::_processor_type = 0; 3258// Processor level is not available on non-NT systems, use vm_version instead 3259int os::win32::_processor_level = 0; 3260julong os::win32::_physical_memory = 0; 3261size_t os::win32::_default_stack_size = 0; 3262 3263 intx os::win32::_os_thread_limit = 0; 3264volatile intx os::win32::_os_thread_count = 0; 3265 3266bool os::win32::_is_nt = false; 3267bool os::win32::_is_windows_2003 = false; 3268 3269 3270void os::win32::initialize_system_info() { 3271 SYSTEM_INFO si; 3272 GetSystemInfo(&si); 3273 _vm_page_size = si.dwPageSize; 3274 _vm_allocation_granularity = si.dwAllocationGranularity; 3275 _processor_type = si.dwProcessorType; 3276 _processor_level = si.wProcessorLevel; 3277 set_processor_count(si.dwNumberOfProcessors); 3278 3279 MEMORYSTATUSEX ms; 3280 ms.dwLength = sizeof(ms); 3281 3282 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3283 // dwMemoryLoad (% of memory in use) 3284 GlobalMemoryStatusEx(&ms); 3285 _physical_memory = ms.ullTotalPhys; 3286 3287 OSVERSIONINFO oi; 3288 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); 3289 GetVersionEx(&oi); 3290 switch(oi.dwPlatformId) { 3291 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 3292 case VER_PLATFORM_WIN32_NT: 3293 _is_nt = true; 3294 { 3295 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3296 if (os_vers == 5002) { 3297 _is_windows_2003 = true; 3298 } 3299 } 3300 break; 3301 default: fatal("Unknown platform"); 3302 } 3303 3304 _default_stack_size = os::current_stack_size(); 3305 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3306 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3307 "stack size not a multiple of page size"); 3308 3309 initialize_performance_counter(); 3310 3311 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is 3312 // known to deadlock the system, if the VM issues to thread operations with 3313 // a too high frequency, e.g., such as changing the priorities. 3314 // The 6000 seems to work well - no deadlocks has been notices on the test 3315 // programs that we have seen experience this problem. 3316 if (!os::win32::is_nt()) { 3317 StarvationMonitorInterval = 6000; 3318 } 3319} 3320 3321 3322void os::win32::setmode_streams() { 3323 _setmode(_fileno(stdin), _O_BINARY); 3324 _setmode(_fileno(stdout), _O_BINARY); 3325 _setmode(_fileno(stderr), _O_BINARY); 3326} 3327 3328 3329int os::message_box(const char* title, const char* message) { 3330 int result = MessageBox(NULL, message, title, 3331 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 3332 return result == IDYES; 3333} 3334 3335int os::allocate_thread_local_storage() { 3336 return TlsAlloc(); 3337} 3338 3339 3340void os::free_thread_local_storage(int index) { 3341 TlsFree(index); 3342} 3343 3344 3345void os::thread_local_storage_at_put(int index, void* value) { 3346 TlsSetValue(index, value); 3347 assert(thread_local_storage_at(index) == value, "Just checking"); 3348} 3349 3350 3351void* os::thread_local_storage_at(int index) { 3352 return TlsGetValue(index); 3353} 3354 3355 3356#ifndef PRODUCT 3357#ifndef _WIN64 3358// Helpers to check whether NX protection is enabled 3359int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 3360 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 3361 pex->ExceptionRecord->NumberParameters > 0 && 3362 pex->ExceptionRecord->ExceptionInformation[0] == 3363 EXCEPTION_INFO_EXEC_VIOLATION) { 3364 return EXCEPTION_EXECUTE_HANDLER; 3365 } 3366 return EXCEPTION_CONTINUE_SEARCH; 3367} 3368 3369void nx_check_protection() { 3370 // If NX is enabled we'll get an exception calling into code on the stack 3371 char code[] = { (char)0xC3 }; // ret 3372 void *code_ptr = (void *)code; 3373 __try { 3374 __asm call code_ptr 3375 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 3376 tty->print_raw_cr("NX protection detected."); 3377 } 3378} 3379#endif // _WIN64 3380#endif // PRODUCT 3381 3382// this is called _before_ the global arguments have been parsed 3383void os::init(void) { 3384 _initial_pid = _getpid(); 3385 3386 init_random(1234567); 3387 3388 win32::initialize_system_info(); 3389 win32::setmode_streams(); 3390 init_page_sizes((size_t) win32::vm_page_size()); 3391 3392 // For better scalability on MP systems (must be called after initialize_system_info) 3393#ifndef PRODUCT 3394 if (is_MP()) { 3395 NoYieldsInMicrolock = true; 3396 } 3397#endif 3398 // This may be overridden later when argument processing is done. 3399 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, 3400 os::win32::is_windows_2003()); 3401 3402 // Initialize main_process and main_thread 3403 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 3404 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 3405 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 3406 fatal("DuplicateHandle failed\n"); 3407 } 3408 main_thread_id = (int) GetCurrentThreadId(); 3409} 3410 3411// To install functions for atexit processing 3412extern "C" { 3413 static void perfMemory_exit_helper() { 3414 perfMemory_exit(); 3415 } 3416} 3417 3418// this is called _after_ the global arguments have been parsed 3419jint os::init_2(void) { 3420 // Allocate a single page and mark it as readable for safepoint polling 3421 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 3422 guarantee( polling_page != NULL, "Reserve Failed for polling page"); 3423 3424 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 3425 guarantee( return_page != NULL, "Commit Failed for polling page"); 3426 3427 os::set_polling_page( polling_page ); 3428 3429#ifndef PRODUCT 3430 if( Verbose && PrintMiscellaneous ) 3431 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 3432#endif 3433 3434 if (!UseMembar) { 3435 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE); 3436 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 3437 3438 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE); 3439 guarantee( return_page != NULL, "Commit Failed for memory serialize page"); 3440 3441 os::set_memory_serialize_page( mem_serialize_page ); 3442 3443#ifndef PRODUCT 3444 if(Verbose && PrintMiscellaneous) 3445 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3446#endif 3447} 3448 3449 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init()); 3450 3451 // Setup Windows Exceptions 3452 3453 // On Itanium systems, Structured Exception Handling does not 3454 // work since stack frames must be walkable by the OS. Since 3455 // much of our code is dynamically generated, and we do not have 3456 // proper unwind .xdata sections, the system simply exits 3457 // rather than delivering the exception. To work around 3458 // this we use VectorExceptions instead. 3459#ifdef _WIN64 3460 if (UseVectoredExceptions) { 3461 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter); 3462 } 3463#endif 3464 3465 // for debugging float code generation bugs 3466 if (ForceFloatExceptions) { 3467#ifndef _WIN64 3468 static long fp_control_word = 0; 3469 __asm { fstcw fp_control_word } 3470 // see Intel PPro Manual, Vol. 2, p 7-16 3471 const long precision = 0x20; 3472 const long underflow = 0x10; 3473 const long overflow = 0x08; 3474 const long zero_div = 0x04; 3475 const long denorm = 0x02; 3476 const long invalid = 0x01; 3477 fp_control_word |= invalid; 3478 __asm { fldcw fp_control_word } 3479#endif 3480 } 3481 3482 // If stack_commit_size is 0, windows will reserve the default size, 3483 // but only commit a small portion of it. 3484 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 3485 size_t default_reserve_size = os::win32::default_stack_size(); 3486 size_t actual_reserve_size = stack_commit_size; 3487 if (stack_commit_size < default_reserve_size) { 3488 // If stack_commit_size == 0, we want this too 3489 actual_reserve_size = default_reserve_size; 3490 } 3491 3492 // Check minimum allowable stack size for thread creation and to initialize 3493 // the java system classes, including StackOverflowError - depends on page 3494 // size. Add a page for compiler2 recursion in main thread. 3495 // Add in 2*BytesPerWord times page size to account for VM stack during 3496 // class initialization depending on 32 or 64 bit VM. 3497 size_t min_stack_allowed = 3498 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 3499 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size(); 3500 if (actual_reserve_size < min_stack_allowed) { 3501 tty->print_cr("\nThe stack size specified is too small, " 3502 "Specify at least %dk", 3503 min_stack_allowed / K); 3504 return JNI_ERR; 3505 } 3506 3507 JavaThread::set_stack_size_at_create(stack_commit_size); 3508 3509 // Calculate theoretical max. size of Threads to guard gainst artifical 3510 // out-of-memory situations, where all available address-space has been 3511 // reserved by thread stacks. 3512 assert(actual_reserve_size != 0, "Must have a stack"); 3513 3514 // Calculate the thread limit when we should start doing Virtual Memory 3515 // banging. Currently when the threads will have used all but 200Mb of space. 3516 // 3517 // TODO: consider performing a similar calculation for commit size instead 3518 // as reserve size, since on a 64-bit platform we'll run into that more 3519 // often than running out of virtual memory space. We can use the 3520 // lower value of the two calculations as the os_thread_limit. 3521 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 3522 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 3523 3524 // at exit methods are called in the reverse order of their registration. 3525 // there is no limit to the number of functions registered. atexit does 3526 // not set errno. 3527 3528 if (PerfAllowAtExitRegistration) { 3529 // only register atexit functions if PerfAllowAtExitRegistration is set. 3530 // atexit functions can be delayed until process exit time, which 3531 // can be problematic for embedded VM situations. Embedded VMs should 3532 // call DestroyJavaVM() to assure that VM resources are released. 3533 3534 // note: perfMemory_exit_helper atexit function may be removed in 3535 // the future if the appropriate cleanup code can be added to the 3536 // VM_Exit VMOperation's doit method. 3537 if (atexit(perfMemory_exit_helper) != 0) { 3538 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3539 } 3540 } 3541 3542 // initialize PSAPI or ToolHelp for fatal error handler 3543 if (win32::is_nt()) _init_psapi(); 3544 else _init_toolhelp(); 3545 3546#ifndef _WIN64 3547 // Print something if NX is enabled (win32 on AMD64) 3548 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 3549#endif 3550 3551 // initialize thread priority policy 3552 prio_init(); 3553 3554 if (UseNUMA && !ForceNUMA) { 3555 UseNUMA = false; // Currently unsupported. 3556 } 3557 3558 return JNI_OK; 3559} 3560 3561void os::init_3(void) { 3562 return; 3563} 3564 3565// Mark the polling page as unreadable 3566void os::make_polling_page_unreadable(void) { 3567 DWORD old_status; 3568 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) ) 3569 fatal("Could not disable polling page"); 3570}; 3571 3572// Mark the polling page as readable 3573void os::make_polling_page_readable(void) { 3574 DWORD old_status; 3575 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) ) 3576 fatal("Could not enable polling page"); 3577}; 3578 3579 3580int os::stat(const char *path, struct stat *sbuf) { 3581 char pathbuf[MAX_PATH]; 3582 if (strlen(path) > MAX_PATH - 1) { 3583 errno = ENAMETOOLONG; 3584 return -1; 3585 } 3586 os::native_path(strcpy(pathbuf, path)); 3587 int ret = ::stat(pathbuf, sbuf); 3588 if (sbuf != NULL && UseUTCFileTimestamp) { 3589 // Fix for 6539723. st_mtime returned from stat() is dependent on 3590 // the system timezone and so can return different values for the 3591 // same file if/when daylight savings time changes. This adjustment 3592 // makes sure the same timestamp is returned regardless of the TZ. 3593 // 3594 // See: 3595 // http://msdn.microsoft.com/library/ 3596 // default.asp?url=/library/en-us/sysinfo/base/ 3597 // time_zone_information_str.asp 3598 // and 3599 // http://msdn.microsoft.com/library/default.asp?url= 3600 // /library/en-us/sysinfo/base/settimezoneinformation.asp 3601 // 3602 // NOTE: there is a insidious bug here: If the timezone is changed 3603 // after the call to stat() but before 'GetTimeZoneInformation()', then 3604 // the adjustment we do here will be wrong and we'll return the wrong 3605 // value (which will likely end up creating an invalid class data 3606 // archive). Absent a better API for this, or some time zone locking 3607 // mechanism, we'll have to live with this risk. 3608 TIME_ZONE_INFORMATION tz; 3609 DWORD tzid = GetTimeZoneInformation(&tz); 3610 int daylightBias = 3611 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 3612 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 3613 } 3614 return ret; 3615} 3616 3617 3618#define FT2INT64(ft) \ 3619 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 3620 3621 3622// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3623// are used by JVM M&M and JVMTI to get user+sys or user CPU time 3624// of a thread. 3625// 3626// current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3627// the fast estimate available on the platform. 3628 3629// current_thread_cpu_time() is not optimized for Windows yet 3630jlong os::current_thread_cpu_time() { 3631 // return user + sys since the cost is the same 3632 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 3633} 3634 3635jlong os::thread_cpu_time(Thread* thread) { 3636 // consistent with what current_thread_cpu_time() returns. 3637 return os::thread_cpu_time(thread, true /* user+sys */); 3638} 3639 3640jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3641 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3642} 3643 3644jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 3645 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 3646 // If this function changes, os::is_thread_cpu_time_supported() should too 3647 if (os::win32::is_nt()) { 3648 FILETIME CreationTime; 3649 FILETIME ExitTime; 3650 FILETIME KernelTime; 3651 FILETIME UserTime; 3652 3653 if ( GetThreadTimes(thread->osthread()->thread_handle(), 3654 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 3655 return -1; 3656 else 3657 if (user_sys_cpu_time) { 3658 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 3659 } else { 3660 return FT2INT64(UserTime) * 100; 3661 } 3662 } else { 3663 return (jlong) timeGetTime() * 1000000; 3664 } 3665} 3666 3667void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3668 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 3669 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 3670 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 3671 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3672} 3673 3674void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3675 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 3676 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 3677 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 3678 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3679} 3680 3681bool os::is_thread_cpu_time_supported() { 3682 // see os::thread_cpu_time 3683 if (os::win32::is_nt()) { 3684 FILETIME CreationTime; 3685 FILETIME ExitTime; 3686 FILETIME KernelTime; 3687 FILETIME UserTime; 3688 3689 if ( GetThreadTimes(GetCurrentThread(), 3690 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 3691 return false; 3692 else 3693 return true; 3694 } else { 3695 return false; 3696 } 3697} 3698 3699// Windows does't provide a loadavg primitive so this is stubbed out for now. 3700// It does have primitives (PDH API) to get CPU usage and run queue length. 3701// "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 3702// If we wanted to implement loadavg on Windows, we have a few options: 3703// 3704// a) Query CPU usage and run queue length and "fake" an answer by 3705// returning the CPU usage if it's under 100%, and the run queue 3706// length otherwise. It turns out that querying is pretty slow 3707// on Windows, on the order of 200 microseconds on a fast machine. 3708// Note that on the Windows the CPU usage value is the % usage 3709// since the last time the API was called (and the first call 3710// returns 100%), so we'd have to deal with that as well. 3711// 3712// b) Sample the "fake" answer using a sampling thread and store 3713// the answer in a global variable. The call to loadavg would 3714// just return the value of the global, avoiding the slow query. 3715// 3716// c) Sample a better answer using exponential decay to smooth the 3717// value. This is basically the algorithm used by UNIX kernels. 3718// 3719// Note that sampling thread starvation could affect both (b) and (c). 3720int os::loadavg(double loadavg[], int nelem) { 3721 return -1; 3722} 3723 3724 3725// DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 3726bool os::dont_yield() { 3727 return DontYieldALot; 3728} 3729 3730// This method is a slightly reworked copy of JDK's sysOpen 3731// from src/windows/hpi/src/sys_api_md.c 3732 3733int os::open(const char *path, int oflag, int mode) { 3734 char pathbuf[MAX_PATH]; 3735 3736 if (strlen(path) > MAX_PATH - 1) { 3737 errno = ENAMETOOLONG; 3738 return -1; 3739 } 3740 os::native_path(strcpy(pathbuf, path)); 3741 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 3742} 3743 3744// Is a (classpath) directory empty? 3745bool os::dir_is_empty(const char* path) { 3746 WIN32_FIND_DATA fd; 3747 HANDLE f = FindFirstFile(path, &fd); 3748 if (f == INVALID_HANDLE_VALUE) { 3749 return true; 3750 } 3751 FindClose(f); 3752 return false; 3753} 3754 3755// create binary file, rewriting existing file if required 3756int os::create_binary_file(const char* path, bool rewrite_existing) { 3757 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 3758 if (!rewrite_existing) { 3759 oflags |= _O_EXCL; 3760 } 3761 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 3762} 3763 3764// return current position of file pointer 3765jlong os::current_file_offset(int fd) { 3766 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 3767} 3768 3769// move file pointer to the specified offset 3770jlong os::seek_to_file_offset(int fd, jlong offset) { 3771 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 3772} 3773 3774 3775jlong os::lseek(int fd, jlong offset, int whence) { 3776 return (jlong) ::_lseeki64(fd, offset, whence); 3777} 3778 3779// This method is a slightly reworked copy of JDK's sysNativePath 3780// from src/windows/hpi/src/path_md.c 3781 3782/* Convert a pathname to native format. On win32, this involves forcing all 3783 separators to be '\\' rather than '/' (both are legal inputs, but Win95 3784 sometimes rejects '/') and removing redundant separators. The input path is 3785 assumed to have been converted into the character encoding used by the local 3786 system. Because this might be a double-byte encoding, care is taken to 3787 treat double-byte lead characters correctly. 3788 3789 This procedure modifies the given path in place, as the result is never 3790 longer than the original. There is no error return; this operation always 3791 succeeds. */ 3792char * os::native_path(char *path) { 3793 char *src = path, *dst = path, *end = path; 3794 char *colon = NULL; /* If a drive specifier is found, this will 3795 point to the colon following the drive 3796 letter */ 3797 3798 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */ 3799 assert(((!::IsDBCSLeadByte('/')) 3800 && (!::IsDBCSLeadByte('\\')) 3801 && (!::IsDBCSLeadByte(':'))), 3802 "Illegal lead byte"); 3803 3804 /* Check for leading separators */ 3805#define isfilesep(c) ((c) == '/' || (c) == '\\') 3806 while (isfilesep(*src)) { 3807 src++; 3808 } 3809 3810 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 3811 /* Remove leading separators if followed by drive specifier. This 3812 hack is necessary to support file URLs containing drive 3813 specifiers (e.g., "file://c:/path"). As a side effect, 3814 "/c:/path" can be used as an alternative to "c:/path". */ 3815 *dst++ = *src++; 3816 colon = dst; 3817 *dst++ = ':'; 3818 src++; 3819 } else { 3820 src = path; 3821 if (isfilesep(src[0]) && isfilesep(src[1])) { 3822 /* UNC pathname: Retain first separator; leave src pointed at 3823 second separator so that further separators will be collapsed 3824 into the second separator. The result will be a pathname 3825 beginning with "\\\\" followed (most likely) by a host name. */ 3826 src = dst = path + 1; 3827 path[0] = '\\'; /* Force first separator to '\\' */ 3828 } 3829 } 3830 3831 end = dst; 3832 3833 /* Remove redundant separators from remainder of path, forcing all 3834 separators to be '\\' rather than '/'. Also, single byte space 3835 characters are removed from the end of the path because those 3836 are not legal ending characters on this operating system. 3837 */ 3838 while (*src != '\0') { 3839 if (isfilesep(*src)) { 3840 *dst++ = '\\'; src++; 3841 while (isfilesep(*src)) src++; 3842 if (*src == '\0') { 3843 /* Check for trailing separator */ 3844 end = dst; 3845 if (colon == dst - 2) break; /* "z:\\" */ 3846 if (dst == path + 1) break; /* "\\" */ 3847 if (dst == path + 2 && isfilesep(path[0])) { 3848 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the 3849 beginning of a UNC pathname. Even though it is not, by 3850 itself, a valid UNC pathname, we leave it as is in order 3851 to be consistent with the path canonicalizer as well 3852 as the win32 APIs, which treat this case as an invalid 3853 UNC pathname rather than as an alias for the root 3854 directory of the current drive. */ 3855 break; 3856 } 3857 end = --dst; /* Path does not denote a root directory, so 3858 remove trailing separator */ 3859 break; 3860 } 3861 end = dst; 3862 } else { 3863 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */ 3864 *dst++ = *src++; 3865 if (*src) *dst++ = *src++; 3866 end = dst; 3867 } else { /* Copy a single-byte character */ 3868 char c = *src++; 3869 *dst++ = c; 3870 /* Space is not a legal ending character */ 3871 if (c != ' ') end = dst; 3872 } 3873 } 3874 } 3875 3876 *end = '\0'; 3877 3878 /* For "z:", add "." to work around a bug in the C runtime library */ 3879 if (colon == dst - 1) { 3880 path[2] = '.'; 3881 path[3] = '\0'; 3882 } 3883 3884 #ifdef DEBUG 3885 jio_fprintf(stderr, "sysNativePath: %s\n", path); 3886 #endif DEBUG 3887 return path; 3888} 3889 3890// This code is a copy of JDK's sysSetLength 3891// from src/windows/hpi/src/sys_api_md.c 3892 3893int os::ftruncate(int fd, jlong length) { 3894 HANDLE h = (HANDLE)::_get_osfhandle(fd); 3895 long high = (long)(length >> 32); 3896 DWORD ret; 3897 3898 if (h == (HANDLE)(-1)) { 3899 return -1; 3900 } 3901 3902 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 3903 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 3904 return -1; 3905 } 3906 3907 if (::SetEndOfFile(h) == FALSE) { 3908 return -1; 3909 } 3910 3911 return 0; 3912} 3913 3914 3915// This code is a copy of JDK's sysSync 3916// from src/windows/hpi/src/sys_api_md.c 3917// except for the legacy workaround for a bug in Win 98 3918 3919int os::fsync(int fd) { 3920 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 3921 3922 if ( (!::FlushFileBuffers(handle)) && 3923 (GetLastError() != ERROR_ACCESS_DENIED) ) { 3924 /* from winerror.h */ 3925 return -1; 3926 } 3927 return 0; 3928} 3929 3930static int nonSeekAvailable(int, long *); 3931static int stdinAvailable(int, long *); 3932 3933#define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR) 3934#define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO) 3935 3936// This code is a copy of JDK's sysAvailable 3937// from src/windows/hpi/src/sys_api_md.c 3938 3939int os::available(int fd, jlong *bytes) { 3940 jlong cur, end; 3941 struct _stati64 stbuf64; 3942 3943 if (::_fstati64(fd, &stbuf64) >= 0) { 3944 int mode = stbuf64.st_mode; 3945 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 3946 int ret; 3947 long lpbytes; 3948 if (fd == 0) { 3949 ret = stdinAvailable(fd, &lpbytes); 3950 } else { 3951 ret = nonSeekAvailable(fd, &lpbytes); 3952 } 3953 (*bytes) = (jlong)(lpbytes); 3954 return ret; 3955 } 3956 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 3957 return FALSE; 3958 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 3959 return FALSE; 3960 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 3961 return FALSE; 3962 } 3963 *bytes = end - cur; 3964 return TRUE; 3965 } else { 3966 return FALSE; 3967 } 3968} 3969 3970// This code is a copy of JDK's nonSeekAvailable 3971// from src/windows/hpi/src/sys_api_md.c 3972 3973static int nonSeekAvailable(int fd, long *pbytes) { 3974 /* This is used for available on non-seekable devices 3975 * (like both named and anonymous pipes, such as pipes 3976 * connected to an exec'd process). 3977 * Standard Input is a special case. 3978 * 3979 */ 3980 HANDLE han; 3981 3982 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 3983 return FALSE; 3984 } 3985 3986 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 3987 /* PeekNamedPipe fails when at EOF. In that case we 3988 * simply make *pbytes = 0 which is consistent with the 3989 * behavior we get on Solaris when an fd is at EOF. 3990 * The only alternative is to raise an Exception, 3991 * which isn't really warranted. 3992 */ 3993 if (::GetLastError() != ERROR_BROKEN_PIPE) { 3994 return FALSE; 3995 } 3996 *pbytes = 0; 3997 } 3998 return TRUE; 3999} 4000 4001#define MAX_INPUT_EVENTS 2000 4002 4003// This code is a copy of JDK's stdinAvailable 4004// from src/windows/hpi/src/sys_api_md.c 4005 4006static int stdinAvailable(int fd, long *pbytes) { 4007 HANDLE han; 4008 DWORD numEventsRead = 0; /* Number of events read from buffer */ 4009 DWORD numEvents = 0; /* Number of events in buffer */ 4010 DWORD i = 0; /* Loop index */ 4011 DWORD curLength = 0; /* Position marker */ 4012 DWORD actualLength = 0; /* Number of bytes readable */ 4013 BOOL error = FALSE; /* Error holder */ 4014 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */ 4015 4016 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4017 return FALSE; 4018 } 4019 4020 /* Construct an array of input records in the console buffer */ 4021 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4022 if (error == 0) { 4023 return nonSeekAvailable(fd, pbytes); 4024 } 4025 4026 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */ 4027 if (numEvents > MAX_INPUT_EVENTS) { 4028 numEvents = MAX_INPUT_EVENTS; 4029 } 4030 4031 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD)); 4032 if (lpBuffer == NULL) { 4033 return FALSE; 4034 } 4035 4036 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4037 if (error == 0) { 4038 os::free(lpBuffer); 4039 return FALSE; 4040 } 4041 4042 /* Examine input records for the number of bytes available */ 4043 for(i=0; i<numEvents; i++) { 4044 if (lpBuffer[i].EventType == KEY_EVENT) { 4045 4046 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4047 &(lpBuffer[i].Event); 4048 if (keyRecord->bKeyDown == TRUE) { 4049 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4050 curLength++; 4051 if (*keyPressed == '\r') { 4052 actualLength = curLength; 4053 } 4054 } 4055 } 4056 } 4057 4058 if(lpBuffer != NULL) { 4059 os::free(lpBuffer); 4060 } 4061 4062 *pbytes = (long) actualLength; 4063 return TRUE; 4064} 4065 4066// Map a block of memory. 4067char* os::map_memory(int fd, const char* file_name, size_t file_offset, 4068 char *addr, size_t bytes, bool read_only, 4069 bool allow_exec) { 4070 HANDLE hFile; 4071 char* base; 4072 4073 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4074 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4075 if (hFile == NULL) { 4076 if (PrintMiscellaneous && Verbose) { 4077 DWORD err = GetLastError(); 4078 tty->print_cr("CreateFile() failed: GetLastError->%ld."); 4079 } 4080 return NULL; 4081 } 4082 4083 if (allow_exec) { 4084 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4085 // unless it comes from a PE image (which the shared archive is not.) 4086 // Even VirtualProtect refuses to give execute access to mapped memory 4087 // that was not previously executable. 4088 // 4089 // Instead, stick the executable region in anonymous memory. Yuck. 4090 // Penalty is that ~4 pages will not be shareable - in the future 4091 // we might consider DLLizing the shared archive with a proper PE 4092 // header so that mapping executable + sharing is possible. 4093 4094 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4095 PAGE_READWRITE); 4096 if (base == NULL) { 4097 if (PrintMiscellaneous && Verbose) { 4098 DWORD err = GetLastError(); 4099 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 4100 } 4101 CloseHandle(hFile); 4102 return NULL; 4103 } 4104 4105 DWORD bytes_read; 4106 OVERLAPPED overlapped; 4107 overlapped.Offset = (DWORD)file_offset; 4108 overlapped.OffsetHigh = 0; 4109 overlapped.hEvent = NULL; 4110 // ReadFile guarantees that if the return value is true, the requested 4111 // number of bytes were read before returning. 4112 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 4113 if (!res) { 4114 if (PrintMiscellaneous && Verbose) { 4115 DWORD err = GetLastError(); 4116 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 4117 } 4118 release_memory(base, bytes); 4119 CloseHandle(hFile); 4120 return NULL; 4121 } 4122 } else { 4123 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 4124 NULL /*file_name*/); 4125 if (hMap == NULL) { 4126 if (PrintMiscellaneous && Verbose) { 4127 DWORD err = GetLastError(); 4128 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld."); 4129 } 4130 CloseHandle(hFile); 4131 return NULL; 4132 } 4133 4134 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 4135 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 4136 (DWORD)bytes, addr); 4137 if (base == NULL) { 4138 if (PrintMiscellaneous && Verbose) { 4139 DWORD err = GetLastError(); 4140 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 4141 } 4142 CloseHandle(hMap); 4143 CloseHandle(hFile); 4144 return NULL; 4145 } 4146 4147 if (CloseHandle(hMap) == 0) { 4148 if (PrintMiscellaneous && Verbose) { 4149 DWORD err = GetLastError(); 4150 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 4151 } 4152 CloseHandle(hFile); 4153 return base; 4154 } 4155 } 4156 4157 if (allow_exec) { 4158 DWORD old_protect; 4159 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 4160 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 4161 4162 if (!res) { 4163 if (PrintMiscellaneous && Verbose) { 4164 DWORD err = GetLastError(); 4165 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 4166 } 4167 // Don't consider this a hard error, on IA32 even if the 4168 // VirtualProtect fails, we should still be able to execute 4169 CloseHandle(hFile); 4170 return base; 4171 } 4172 } 4173 4174 if (CloseHandle(hFile) == 0) { 4175 if (PrintMiscellaneous && Verbose) { 4176 DWORD err = GetLastError(); 4177 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 4178 } 4179 return base; 4180 } 4181 4182 return base; 4183} 4184 4185 4186// Remap a block of memory. 4187char* os::remap_memory(int fd, const char* file_name, size_t file_offset, 4188 char *addr, size_t bytes, bool read_only, 4189 bool allow_exec) { 4190 // This OS does not allow existing memory maps to be remapped so we 4191 // have to unmap the memory before we remap it. 4192 if (!os::unmap_memory(addr, bytes)) { 4193 return NULL; 4194 } 4195 4196 // There is a very small theoretical window between the unmap_memory() 4197 // call above and the map_memory() call below where a thread in native 4198 // code may be able to access an address that is no longer mapped. 4199 4200 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4201 allow_exec); 4202} 4203 4204 4205// Unmap a block of memory. 4206// Returns true=success, otherwise false. 4207 4208bool os::unmap_memory(char* addr, size_t bytes) { 4209 BOOL result = UnmapViewOfFile(addr); 4210 if (result == 0) { 4211 if (PrintMiscellaneous && Verbose) { 4212 DWORD err = GetLastError(); 4213 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 4214 } 4215 return false; 4216 } 4217 return true; 4218} 4219 4220void os::pause() { 4221 char filename[MAX_PATH]; 4222 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4223 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4224 } else { 4225 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4226 } 4227 4228 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4229 if (fd != -1) { 4230 struct stat buf; 4231 ::close(fd); 4232 while (::stat(filename, &buf) == 0) { 4233 Sleep(100); 4234 } 4235 } else { 4236 jio_fprintf(stderr, 4237 "Could not open pause file '%s', continuing immediately.\n", filename); 4238 } 4239} 4240 4241// An Event wraps a win32 "CreateEvent" kernel handle. 4242// 4243// We have a number of choices regarding "CreateEvent" win32 handle leakage: 4244// 4245// 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 4246// field, and call CloseHandle() on the win32 event handle. Unpark() would 4247// need to be modified to tolerate finding a NULL (invalid) win32 event handle. 4248// In addition, an unpark() operation might fetch the handle field, but the 4249// event could recycle between the fetch and the SetEvent() operation. 4250// SetEvent() would either fail because the handle was invalid, or inadvertently work, 4251// as the win32 handle value had been recycled. In an ideal world calling SetEvent() 4252// on an stale but recycled handle would be harmless, but in practice this might 4253// confuse other non-Sun code, so it's not a viable approach. 4254// 4255// 2: Once a win32 event handle is associated with an Event, it remains associated 4256// with the Event. The event handle is never closed. This could be construed 4257// as handle leakage, but only up to the maximum # of threads that have been extant 4258// at any one time. This shouldn't be an issue, as windows platforms typically 4259// permit a process to have hundreds of thousands of open handles. 4260// 4261// 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 4262// and release unused handles. 4263// 4264// 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 4265// It's not clear, however, that we wouldn't be trading one type of leak for another. 4266// 4267// 5. Use an RCU-like mechanism (Read-Copy Update). 4268// Or perhaps something similar to Maged Michael's "Hazard pointers". 4269// 4270// We use (2). 4271// 4272// TODO-FIXME: 4273// 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 4274// 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 4275// to recover from (or at least detect) the dreaded Windows 841176 bug. 4276// 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 4277// into a single win32 CreateEvent() handle. 4278// 4279// _Event transitions in park() 4280// -1 => -1 : illegal 4281// 1 => 0 : pass - return immediately 4282// 0 => -1 : block 4283// 4284// _Event serves as a restricted-range semaphore : 4285// -1 : thread is blocked 4286// 0 : neutral - thread is running or ready 4287// 1 : signaled - thread is running or ready 4288// 4289// Another possible encoding of _Event would be 4290// with explicit "PARKED" and "SIGNALED" bits. 4291 4292int os::PlatformEvent::park (jlong Millis) { 4293 guarantee (_ParkHandle != NULL , "Invariant") ; 4294 guarantee (Millis > 0 , "Invariant") ; 4295 int v ; 4296 4297 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 4298 // the initial park() operation. 4299 4300 for (;;) { 4301 v = _Event ; 4302 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4303 } 4304 guarantee ((v == 0) || (v == 1), "invariant") ; 4305 if (v != 0) return OS_OK ; 4306 4307 // Do this the hard way by blocking ... 4308 // TODO: consider a brief spin here, gated on the success of recent 4309 // spin attempts by this thread. 4310 // 4311 // We decompose long timeouts into series of shorter timed waits. 4312 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 4313 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 4314 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 4315 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 4316 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 4317 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 4318 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 4319 // for the already waited time. This policy does not admit any new outcomes. 4320 // In the future, however, we might want to track the accumulated wait time and 4321 // adjust Millis accordingly if we encounter a spurious wakeup. 4322 4323 const int MAXTIMEOUT = 0x10000000 ; 4324 DWORD rv = WAIT_TIMEOUT ; 4325 while (_Event < 0 && Millis > 0) { 4326 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT) 4327 if (Millis > MAXTIMEOUT) { 4328 prd = MAXTIMEOUT ; 4329 } 4330 rv = ::WaitForSingleObject (_ParkHandle, prd) ; 4331 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ; 4332 if (rv == WAIT_TIMEOUT) { 4333 Millis -= prd ; 4334 } 4335 } 4336 v = _Event ; 4337 _Event = 0 ; 4338 OrderAccess::fence() ; 4339 // If we encounter a nearly simultanous timeout expiry and unpark() 4340 // we return OS_OK indicating we awoke via unpark(). 4341 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 4342 return (v >= 0) ? OS_OK : OS_TIMEOUT ; 4343} 4344 4345void os::PlatformEvent::park () { 4346 guarantee (_ParkHandle != NULL, "Invariant") ; 4347 // Invariant: Only the thread associated with the Event/PlatformEvent 4348 // may call park(). 4349 int v ; 4350 for (;;) { 4351 v = _Event ; 4352 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 4353 } 4354 guarantee ((v == 0) || (v == 1), "invariant") ; 4355 if (v != 0) return ; 4356 4357 // Do this the hard way by blocking ... 4358 // TODO: consider a brief spin here, gated on the success of recent 4359 // spin attempts by this thread. 4360 while (_Event < 0) { 4361 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ; 4362 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ; 4363 } 4364 4365 // Usually we'll find _Event == 0 at this point, but as 4366 // an optional optimization we clear it, just in case can 4367 // multiple unpark() operations drove _Event up to 1. 4368 _Event = 0 ; 4369 OrderAccess::fence() ; 4370 guarantee (_Event >= 0, "invariant") ; 4371} 4372 4373void os::PlatformEvent::unpark() { 4374 guarantee (_ParkHandle != NULL, "Invariant") ; 4375 int v ; 4376 for (;;) { 4377 v = _Event ; // Increment _Event if it's < 1. 4378 if (v > 0) { 4379 // If it's already signaled just return. 4380 // The LD of _Event could have reordered or be satisfied 4381 // by a read-aside from this processor's write buffer. 4382 // To avoid problems execute a barrier and then 4383 // ratify the value. A degenerate CAS() would also work. 4384 // Viz., CAS (v+0, &_Event, v) == v). 4385 OrderAccess::fence() ; 4386 if (_Event == v) return ; 4387 continue ; 4388 } 4389 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; 4390 } 4391 if (v < 0) { 4392 ::SetEvent (_ParkHandle) ; 4393 } 4394} 4395 4396 4397// JSR166 4398// ------------------------------------------------------- 4399 4400/* 4401 * The Windows implementation of Park is very straightforward: Basic 4402 * operations on Win32 Events turn out to have the right semantics to 4403 * use them directly. We opportunistically resuse the event inherited 4404 * from Monitor. 4405 */ 4406 4407 4408void Parker::park(bool isAbsolute, jlong time) { 4409 guarantee (_ParkEvent != NULL, "invariant") ; 4410 // First, demultiplex/decode time arguments 4411 if (time < 0) { // don't wait 4412 return; 4413 } 4414 else if (time == 0 && !isAbsolute) { 4415 time = INFINITE; 4416 } 4417 else if (isAbsolute) { 4418 time -= os::javaTimeMillis(); // convert to relative time 4419 if (time <= 0) // already elapsed 4420 return; 4421 } 4422 else { // relative 4423 time /= 1000000; // Must coarsen from nanos to millis 4424 if (time == 0) // Wait for the minimal time unit if zero 4425 time = 1; 4426 } 4427 4428 JavaThread* thread = (JavaThread*)(Thread::current()); 4429 assert(thread->is_Java_thread(), "Must be JavaThread"); 4430 JavaThread *jt = (JavaThread *)thread; 4431 4432 // Don't wait if interrupted or already triggered 4433 if (Thread::is_interrupted(thread, false) || 4434 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 4435 ResetEvent(_ParkEvent); 4436 return; 4437 } 4438 else { 4439 ThreadBlockInVM tbivm(jt); 4440 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4441 jt->set_suspend_equivalent(); 4442 4443 WaitForSingleObject(_ParkEvent, time); 4444 ResetEvent(_ParkEvent); 4445 4446 // If externally suspended while waiting, re-suspend 4447 if (jt->handle_special_suspend_equivalent_condition()) { 4448 jt->java_suspend_self(); 4449 } 4450 } 4451} 4452 4453void Parker::unpark() { 4454 guarantee (_ParkEvent != NULL, "invariant") ; 4455 SetEvent(_ParkEvent); 4456} 4457 4458// Run the specified command in a separate process. Return its exit value, 4459// or -1 on failure (e.g. can't create a new process). 4460int os::fork_and_exec(char* cmd) { 4461 STARTUPINFO si; 4462 PROCESS_INFORMATION pi; 4463 4464 memset(&si, 0, sizeof(si)); 4465 si.cb = sizeof(si); 4466 memset(&pi, 0, sizeof(pi)); 4467 BOOL rslt = CreateProcess(NULL, // executable name - use command line 4468 cmd, // command line 4469 NULL, // process security attribute 4470 NULL, // thread security attribute 4471 TRUE, // inherits system handles 4472 0, // no creation flags 4473 NULL, // use parent's environment block 4474 NULL, // use parent's starting directory 4475 &si, // (in) startup information 4476 &pi); // (out) process information 4477 4478 if (rslt) { 4479 // Wait until child process exits. 4480 WaitForSingleObject(pi.hProcess, INFINITE); 4481 4482 DWORD exit_code; 4483 GetExitCodeProcess(pi.hProcess, &exit_code); 4484 4485 // Close process and thread handles. 4486 CloseHandle(pi.hProcess); 4487 CloseHandle(pi.hThread); 4488 4489 return (int)exit_code; 4490 } else { 4491 return -1; 4492 } 4493} 4494 4495//-------------------------------------------------------------------------------------------------- 4496// Non-product code 4497 4498static int mallocDebugIntervalCounter = 0; 4499static int mallocDebugCounter = 0; 4500bool os::check_heap(bool force) { 4501 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 4502 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 4503 // Note: HeapValidate executes two hardware breakpoints when it finds something 4504 // wrong; at these points, eax contains the address of the offending block (I think). 4505 // To get to the exlicit error message(s) below, just continue twice. 4506 HANDLE heap = GetProcessHeap(); 4507 { HeapLock(heap); 4508 PROCESS_HEAP_ENTRY phe; 4509 phe.lpData = NULL; 4510 while (HeapWalk(heap, &phe) != 0) { 4511 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 4512 !HeapValidate(heap, 0, phe.lpData)) { 4513 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 4514 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 4515 fatal("corrupted C heap"); 4516 } 4517 } 4518 int err = GetLastError(); 4519 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 4520 fatal(err_msg("heap walk aborted with error %d", err)); 4521 } 4522 HeapUnlock(heap); 4523 } 4524 mallocDebugIntervalCounter = 0; 4525 } 4526 return true; 4527} 4528 4529 4530bool os::find(address addr, outputStream* st) { 4531 // Nothing yet 4532 return false; 4533} 4534 4535LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 4536 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 4537 4538 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) { 4539 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow(); 4540 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 4541 address addr = (address) exceptionRecord->ExceptionInformation[1]; 4542 4543 if (os::is_memory_serialize_page(thread, addr)) 4544 return EXCEPTION_CONTINUE_EXECUTION; 4545 } 4546 4547 return EXCEPTION_CONTINUE_SEARCH; 4548} 4549 4550static int getLastErrorString(char *buf, size_t len) 4551{ 4552 long errval; 4553 4554 if ((errval = GetLastError()) != 0) 4555 { 4556 /* DOS error */ 4557 size_t n = (size_t)FormatMessage( 4558 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 4559 NULL, 4560 errval, 4561 0, 4562 buf, 4563 (DWORD)len, 4564 NULL); 4565 if (n > 3) { 4566 /* Drop final '.', CR, LF */ 4567 if (buf[n - 1] == '\n') n--; 4568 if (buf[n - 1] == '\r') n--; 4569 if (buf[n - 1] == '.') n--; 4570 buf[n] = '\0'; 4571 } 4572 return (int)n; 4573 } 4574 4575 if (errno != 0) 4576 { 4577 /* C runtime error that has no corresponding DOS error code */ 4578 const char *s = strerror(errno); 4579 size_t n = strlen(s); 4580 if (n >= len) n = len - 1; 4581 strncpy(buf, s, n); 4582 buf[n] = '\0'; 4583 return (int)n; 4584 } 4585 return 0; 4586} 4587 4588 4589// We don't build a headless jre for Windows 4590bool os::is_headless_jre() { return false; } 4591 4592// OS_SocketInterface 4593// Not used on Windows 4594 4595// OS_SocketInterface 4596typedef struct hostent * (PASCAL FAR *ws2_ifn_ptr_t)(...); 4597ws2_ifn_ptr_t *get_host_by_name_fn = NULL; 4598 4599typedef CRITICAL_SECTION mutex_t; 4600#define mutexInit(m) InitializeCriticalSection(m) 4601#define mutexDestroy(m) DeleteCriticalSection(m) 4602#define mutexLock(m) EnterCriticalSection(m) 4603#define mutexUnlock(m) LeaveCriticalSection(m) 4604 4605static bool sockfnptrs_initialized = FALSE; 4606static mutex_t sockFnTableMutex; 4607 4608/* is Winsock2 loaded? better to be explicit than to rely on sockfnptrs */ 4609static bool winsock2Available = FALSE; 4610 4611 4612static void initSockFnTable() { 4613 int (PASCAL FAR* WSAStartupPtr)(WORD, LPWSADATA); 4614 WSADATA wsadata; 4615 4616 ::mutexInit(&sockFnTableMutex); 4617 ::mutexLock(&sockFnTableMutex); 4618 4619 if (sockfnptrs_initialized == FALSE) { 4620 HMODULE hWinsock; 4621 4622 /* try to load Winsock2, and if that fails, load Winsock */ 4623 hWinsock = ::LoadLibrary("ws2_32.dll"); 4624 4625 if (hWinsock == NULL) { 4626 jio_fprintf(stderr, "Could not load Winsock 2 (error: %d)\n", 4627 ::GetLastError()); 4628 return; 4629 } 4630 4631 /* If we loaded a DLL, then we might as well initialize it. */ 4632 WSAStartupPtr = (int (PASCAL FAR *)(WORD, LPWSADATA)) 4633 ::GetProcAddress(hWinsock, "WSAStartup"); 4634 4635 if (WSAStartupPtr(MAKEWORD(1,1), &wsadata) != 0) { 4636 jio_fprintf(stderr, "Could not initialize Winsock\n"); 4637 } 4638 4639 get_host_by_name_fn 4640 = (ws2_ifn_ptr_t*) GetProcAddress(hWinsock, "gethostbyname"); 4641 } 4642 4643 assert(get_host_by_name_fn != NULL, 4644 "gethostbyname function not found"); 4645 sockfnptrs_initialized = TRUE; 4646 ::mutexUnlock(&sockFnTableMutex); 4647} 4648 4649struct hostent* os::get_host_by_name(char* name) { 4650 if (!sockfnptrs_initialized) { 4651 initSockFnTable(); 4652 } 4653 4654 assert(sockfnptrs_initialized == TRUE && get_host_by_name_fn != NULL, 4655 "sockfnptrs is not initialized or pointer to gethostbyname function is NULL"); 4656 return (*get_host_by_name_fn)(name); 4657} 4658 4659 4660int os::socket_close(int fd) { 4661 ShouldNotReachHere(); 4662 return 0; 4663} 4664 4665int os::socket_available(int fd, jint *pbytes) { 4666 ShouldNotReachHere(); 4667 return 0; 4668} 4669 4670int os::socket(int domain, int type, int protocol) { 4671 ShouldNotReachHere(); 4672 return 0; 4673} 4674 4675int os::listen(int fd, int count) { 4676 ShouldNotReachHere(); 4677 return 0; 4678} 4679 4680int os::connect(int fd, struct sockaddr *him, int len) { 4681 ShouldNotReachHere(); 4682 return 0; 4683} 4684 4685int os::accept(int fd, struct sockaddr *him, int *len) { 4686 ShouldNotReachHere(); 4687 return 0; 4688} 4689 4690int os::sendto(int fd, char *buf, int len, int flags, 4691 struct sockaddr *to, int tolen) { 4692 ShouldNotReachHere(); 4693 return 0; 4694} 4695 4696int os::recvfrom(int fd, char *buf, int nBytes, int flags, 4697 sockaddr *from, int *fromlen) { 4698 ShouldNotReachHere(); 4699 return 0; 4700} 4701 4702int os::recv(int fd, char *buf, int nBytes, int flags) { 4703 ShouldNotReachHere(); 4704 return 0; 4705} 4706 4707int os::send(int fd, char *buf, int nBytes, int flags) { 4708 ShouldNotReachHere(); 4709 return 0; 4710} 4711 4712int os::raw_send(int fd, char *buf, int nBytes, int flags) { 4713 ShouldNotReachHere(); 4714 return 0; 4715} 4716 4717int os::timeout(int fd, long timeout) { 4718 ShouldNotReachHere(); 4719 return 0; 4720} 4721 4722int os::get_host_name(char* name, int namelen) { 4723 ShouldNotReachHere(); 4724 return 0; 4725} 4726 4727int os::socket_shutdown(int fd, int howto) { 4728 ShouldNotReachHere(); 4729 return 0; 4730} 4731 4732int os::bind(int fd, struct sockaddr *him, int len) { 4733 ShouldNotReachHere(); 4734 return 0; 4735} 4736 4737int os::get_sock_name(int fd, struct sockaddr *him, int *len) { 4738 ShouldNotReachHere(); 4739 return 0; 4740} 4741 4742int os::get_sock_opt(int fd, int level, int optname, 4743 char *optval, int* optlen) { 4744 ShouldNotReachHere(); 4745 return 0; 4746} 4747 4748int os::set_sock_opt(int fd, int level, int optname, 4749 const char *optval, int optlen) { 4750 ShouldNotReachHere(); 4751 return 0; 4752} 4753