os_windows.cpp revision 6761:739468857ffb
1/* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25// Must be at least Windows 2000 or XP to use IsDebuggerPresent 26#define _WIN32_WINNT 0x500 27 28// no precompiled headers 29#include "classfile/classLoader.hpp" 30#include "classfile/systemDictionary.hpp" 31#include "classfile/vmSymbols.hpp" 32#include "code/icBuffer.hpp" 33#include "code/vtableStubs.hpp" 34#include "compiler/compileBroker.hpp" 35#include "compiler/disassembler.hpp" 36#include "interpreter/interpreter.hpp" 37#include "jvm_windows.h" 38#include "memory/allocation.inline.hpp" 39#include "memory/filemap.hpp" 40#include "mutex_windows.inline.hpp" 41#include "oops/oop.inline.hpp" 42#include "os_share_windows.hpp" 43#include "os_windows.inline.hpp" 44#include "prims/jniFastGetField.hpp" 45#include "prims/jvm.h" 46#include "prims/jvm_misc.hpp" 47#include "runtime/arguments.hpp" 48#include "runtime/atomic.inline.hpp" 49#include "runtime/extendedPC.hpp" 50#include "runtime/globals.hpp" 51#include "runtime/interfaceSupport.hpp" 52#include "runtime/java.hpp" 53#include "runtime/javaCalls.hpp" 54#include "runtime/mutexLocker.hpp" 55#include "runtime/objectMonitor.hpp" 56#include "runtime/orderAccess.inline.hpp" 57#include "runtime/osThread.hpp" 58#include "runtime/perfMemory.hpp" 59#include "runtime/sharedRuntime.hpp" 60#include "runtime/statSampler.hpp" 61#include "runtime/stubRoutines.hpp" 62#include "runtime/thread.inline.hpp" 63#include "runtime/threadCritical.hpp" 64#include "runtime/timer.hpp" 65#include "runtime/vm_version.hpp" 66#include "services/attachListener.hpp" 67#include "services/memTracker.hpp" 68#include "services/runtimeService.hpp" 69#include "utilities/decoder.hpp" 70#include "utilities/defaultStream.hpp" 71#include "utilities/events.hpp" 72#include "utilities/growableArray.hpp" 73#include "utilities/vmError.hpp" 74 75#ifdef _DEBUG 76#include <crtdbg.h> 77#endif 78 79 80#include <windows.h> 81#include <sys/types.h> 82#include <sys/stat.h> 83#include <sys/timeb.h> 84#include <objidl.h> 85#include <shlobj.h> 86 87#include <malloc.h> 88#include <signal.h> 89#include <direct.h> 90#include <errno.h> 91#include <fcntl.h> 92#include <io.h> 93#include <process.h> // For _beginthreadex(), _endthreadex() 94#include <imagehlp.h> // For os::dll_address_to_function_name 95/* for enumerating dll libraries */ 96#include <vdmdbg.h> 97 98// for timer info max values which include all bits 99#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 100 101// For DLL loading/load error detection 102// Values of PE COFF 103#define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c 104#define IMAGE_FILE_SIGNATURE_LENGTH 4 105 106static HANDLE main_process; 107static HANDLE main_thread; 108static int main_thread_id; 109 110static FILETIME process_creation_time; 111static FILETIME process_exit_time; 112static FILETIME process_user_time; 113static FILETIME process_kernel_time; 114 115#ifdef _M_IA64 116#define __CPU__ ia64 117#elif _M_AMD64 118#define __CPU__ amd64 119#else 120#define __CPU__ i486 121#endif 122 123// save DLL module handle, used by GetModuleFileName 124 125HINSTANCE vm_lib_handle; 126 127BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) { 128 switch (reason) { 129 case DLL_PROCESS_ATTACH: 130 vm_lib_handle = hinst; 131 if (ForceTimeHighResolution) 132 timeBeginPeriod(1L); 133 break; 134 case DLL_PROCESS_DETACH: 135 if (ForceTimeHighResolution) 136 timeEndPeriod(1L); 137 138 // Workaround for issue when a custom launcher doesn't call 139 // DestroyJavaVM and NMT is trying to track memory when free is 140 // called from a static destructor 141 if (MemTracker::is_on()) { 142 MemTracker::shutdown(MemTracker::NMT_normal); 143 } 144 break; 145 default: 146 break; 147 } 148 return true; 149} 150 151static inline double fileTimeAsDouble(FILETIME* time) { 152 const double high = (double) ((unsigned int) ~0); 153 const double split = 10000000.0; 154 double result = (time->dwLowDateTime / split) + 155 time->dwHighDateTime * (high/split); 156 return result; 157} 158 159// Implementation of os 160 161bool os::getenv(const char* name, char* buffer, int len) { 162 int result = GetEnvironmentVariable(name, buffer, len); 163 return result > 0 && result < len; 164} 165 166 167// No setuid programs under Windows. 168bool os::have_special_privileges() { 169 return false; 170} 171 172 173// This method is a periodic task to check for misbehaving JNI applications 174// under CheckJNI, we can add any periodic checks here. 175// For Windows at the moment does nothing 176void os::run_periodic_checks() { 177 return; 178} 179 180// previous UnhandledExceptionFilter, if there is one 181static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL; 182 183LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo); 184void os::init_system_properties_values() { 185 /* sysclasspath, java_home, dll_dir */ 186 { 187 char *home_path; 188 char *dll_path; 189 char *pslash; 190 char *bin = "\\bin"; 191 char home_dir[MAX_PATH]; 192 193 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) { 194 os::jvm_path(home_dir, sizeof(home_dir)); 195 // Found the full path to jvm.dll. 196 // Now cut the path to <java_home>/jre if we can. 197 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */ 198 pslash = strrchr(home_dir, '\\'); 199 if (pslash != NULL) { 200 *pslash = '\0'; /* get rid of \{client|server} */ 201 pslash = strrchr(home_dir, '\\'); 202 if (pslash != NULL) 203 *pslash = '\0'; /* get rid of \bin */ 204 } 205 } 206 207 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal); 208 if (home_path == NULL) 209 return; 210 strcpy(home_path, home_dir); 211 Arguments::set_java_home(home_path); 212 213 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, mtInternal); 214 if (dll_path == NULL) 215 return; 216 strcpy(dll_path, home_dir); 217 strcat(dll_path, bin); 218 Arguments::set_dll_dir(dll_path); 219 220 if (!set_boot_path('\\', ';')) 221 return; 222 } 223 224 /* library_path */ 225 #define EXT_DIR "\\lib\\ext" 226 #define BIN_DIR "\\bin" 227 #define PACKAGE_DIR "\\Sun\\Java" 228 { 229 /* Win32 library search order (See the documentation for LoadLibrary): 230 * 231 * 1. The directory from which application is loaded. 232 * 2. The system wide Java Extensions directory (Java only) 233 * 3. System directory (GetSystemDirectory) 234 * 4. Windows directory (GetWindowsDirectory) 235 * 5. The PATH environment variable 236 * 6. The current directory 237 */ 238 239 char *library_path; 240 char tmp[MAX_PATH]; 241 char *path_str = ::getenv("PATH"); 242 243 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) + 244 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal); 245 246 library_path[0] = '\0'; 247 248 GetModuleFileName(NULL, tmp, sizeof(tmp)); 249 *(strrchr(tmp, '\\')) = '\0'; 250 strcat(library_path, tmp); 251 252 GetWindowsDirectory(tmp, sizeof(tmp)); 253 strcat(library_path, ";"); 254 strcat(library_path, tmp); 255 strcat(library_path, PACKAGE_DIR BIN_DIR); 256 257 GetSystemDirectory(tmp, sizeof(tmp)); 258 strcat(library_path, ";"); 259 strcat(library_path, tmp); 260 261 GetWindowsDirectory(tmp, sizeof(tmp)); 262 strcat(library_path, ";"); 263 strcat(library_path, tmp); 264 265 if (path_str) { 266 strcat(library_path, ";"); 267 strcat(library_path, path_str); 268 } 269 270 strcat(library_path, ";."); 271 272 Arguments::set_library_path(library_path); 273 FREE_C_HEAP_ARRAY(char, library_path, mtInternal); 274 } 275 276 /* Default extensions directory */ 277 { 278 char path[MAX_PATH]; 279 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1]; 280 GetWindowsDirectory(path, MAX_PATH); 281 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR, 282 path, PACKAGE_DIR, EXT_DIR); 283 Arguments::set_ext_dirs(buf); 284 } 285 #undef EXT_DIR 286 #undef BIN_DIR 287 #undef PACKAGE_DIR 288 289 /* Default endorsed standards directory. */ 290 { 291 #define ENDORSED_DIR "\\lib\\endorsed" 292 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR); 293 char * buf = NEW_C_HEAP_ARRAY(char, len, mtInternal); 294 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR); 295 Arguments::set_endorsed_dirs(buf); 296 #undef ENDORSED_DIR 297 } 298 299#ifndef _WIN64 300 // set our UnhandledExceptionFilter and save any previous one 301 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception); 302#endif 303 304 // Done 305 return; 306} 307 308void os::breakpoint() { 309 DebugBreak(); 310} 311 312// Invoked from the BREAKPOINT Macro 313extern "C" void breakpoint() { 314 os::breakpoint(); 315} 316 317/* 318 * RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP. 319 * So far, this method is only used by Native Memory Tracking, which is 320 * only supported on Windows XP or later. 321 */ 322address os::get_caller_pc(int n) { 323#ifdef _NMT_NOINLINE_ 324 n++; 325#endif 326 address pc; 327 if (os::Kernel32Dll::RtlCaptureStackBackTrace(n + 1, 1, (PVOID*)&pc, NULL) == 1) { 328 return pc; 329 } 330 return NULL; 331} 332 333 334// os::current_stack_base() 335// 336// Returns the base of the stack, which is the stack's 337// starting address. This function must be called 338// while running on the stack of the thread being queried. 339 340address os::current_stack_base() { 341 MEMORY_BASIC_INFORMATION minfo; 342 address stack_bottom; 343 size_t stack_size; 344 345 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 346 stack_bottom = (address)minfo.AllocationBase; 347 stack_size = minfo.RegionSize; 348 349 // Add up the sizes of all the regions with the same 350 // AllocationBase. 351 while (1) 352 { 353 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo)); 354 if (stack_bottom == (address)minfo.AllocationBase) 355 stack_size += minfo.RegionSize; 356 else 357 break; 358 } 359 360#ifdef _M_IA64 361 // IA64 has memory and register stacks 362 // 363 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit 364 // at thread creation (1MB backing store growing upwards, 1MB memory stack 365 // growing downwards, 2MB summed up) 366 // 367 // ... 368 // ------- top of stack (high address) ----- 369 // | 370 // | 1MB 371 // | Backing Store (Register Stack) 372 // | 373 // | / \ 374 // | | 375 // | | 376 // | | 377 // ------------------------ stack base ----- 378 // | 1MB 379 // | Memory Stack 380 // | 381 // | | 382 // | | 383 // | | 384 // | \ / 385 // | 386 // ----- bottom of stack (low address) ----- 387 // ... 388 389 stack_size = stack_size / 2; 390#endif 391 return stack_bottom + stack_size; 392} 393 394size_t os::current_stack_size() { 395 size_t sz; 396 MEMORY_BASIC_INFORMATION minfo; 397 VirtualQuery(&minfo, &minfo, sizeof(minfo)); 398 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase; 399 return sz; 400} 401 402struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 403 const struct tm* time_struct_ptr = localtime(clock); 404 if (time_struct_ptr != NULL) { 405 *res = *time_struct_ptr; 406 return res; 407 } 408 return NULL; 409} 410 411LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo); 412 413// Thread start routine for all new Java threads 414static unsigned __stdcall java_start(Thread* thread) { 415 // Try to randomize the cache line index of hot stack frames. 416 // This helps when threads of the same stack traces evict each other's 417 // cache lines. The threads can be either from the same JVM instance, or 418 // from different JVM instances. The benefit is especially true for 419 // processors with hyperthreading technology. 420 static int counter = 0; 421 int pid = os::current_process_id(); 422 _alloca(((pid ^ counter++) & 7) * 128); 423 424 OSThread* osthr = thread->osthread(); 425 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 426 427 if (UseNUMA) { 428 int lgrp_id = os::numa_get_group_id(); 429 if (lgrp_id != -1) { 430 thread->set_lgrp_id(lgrp_id); 431 } 432 } 433 434 435 // Install a win32 structured exception handler around every thread created 436 // by VM, so VM can genrate error dump when an exception occurred in non- 437 // Java thread (e.g. VM thread). 438 __try { 439 thread->run(); 440 } __except(topLevelExceptionFilter( 441 (_EXCEPTION_POINTERS*)_exception_info())) { 442 // Nothing to do. 443 } 444 445 // One less thread is executing 446 // When the VMThread gets here, the main thread may have already exited 447 // which frees the CodeHeap containing the Atomic::add code 448 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 449 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count); 450 } 451 452 return 0; 453} 454 455static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) { 456 // Allocate the OSThread object 457 OSThread* osthread = new OSThread(NULL, NULL); 458 if (osthread == NULL) return NULL; 459 460 // Initialize support for Java interrupts 461 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 462 if (interrupt_event == NULL) { 463 delete osthread; 464 return NULL; 465 } 466 osthread->set_interrupt_event(interrupt_event); 467 468 // Store info on the Win32 thread into the OSThread 469 osthread->set_thread_handle(thread_handle); 470 osthread->set_thread_id(thread_id); 471 472 if (UseNUMA) { 473 int lgrp_id = os::numa_get_group_id(); 474 if (lgrp_id != -1) { 475 thread->set_lgrp_id(lgrp_id); 476 } 477 } 478 479 // Initial thread state is INITIALIZED, not SUSPENDED 480 osthread->set_state(INITIALIZED); 481 482 return osthread; 483} 484 485 486bool os::create_attached_thread(JavaThread* thread) { 487#ifdef ASSERT 488 thread->verify_not_published(); 489#endif 490 HANDLE thread_h; 491 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(), 492 &thread_h, THREAD_ALL_ACCESS, false, 0)) { 493 fatal("DuplicateHandle failed\n"); 494 } 495 OSThread* osthread = create_os_thread(thread, thread_h, 496 (int)current_thread_id()); 497 if (osthread == NULL) { 498 return false; 499 } 500 501 // Initial thread state is RUNNABLE 502 osthread->set_state(RUNNABLE); 503 504 thread->set_osthread(osthread); 505 return true; 506} 507 508bool os::create_main_thread(JavaThread* thread) { 509#ifdef ASSERT 510 thread->verify_not_published(); 511#endif 512 if (_starting_thread == NULL) { 513 _starting_thread = create_os_thread(thread, main_thread, main_thread_id); 514 if (_starting_thread == NULL) { 515 return false; 516 } 517 } 518 519 // The primordial thread is runnable from the start) 520 _starting_thread->set_state(RUNNABLE); 521 522 thread->set_osthread(_starting_thread); 523 return true; 524} 525 526// Allocate and initialize a new OSThread 527bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 528 unsigned thread_id; 529 530 // Allocate the OSThread object 531 OSThread* osthread = new OSThread(NULL, NULL); 532 if (osthread == NULL) { 533 return false; 534 } 535 536 // Initialize support for Java interrupts 537 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL); 538 if (interrupt_event == NULL) { 539 delete osthread; 540 return NULL; 541 } 542 osthread->set_interrupt_event(interrupt_event); 543 osthread->set_interrupted(false); 544 545 thread->set_osthread(osthread); 546 547 if (stack_size == 0) { 548 switch (thr_type) { 549 case os::java_thread: 550 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 551 if (JavaThread::stack_size_at_create() > 0) 552 stack_size = JavaThread::stack_size_at_create(); 553 break; 554 case os::compiler_thread: 555 if (CompilerThreadStackSize > 0) { 556 stack_size = (size_t)(CompilerThreadStackSize * K); 557 break; 558 } // else fall through: 559 // use VMThreadStackSize if CompilerThreadStackSize is not defined 560 case os::vm_thread: 561 case os::pgc_thread: 562 case os::cgc_thread: 563 case os::watcher_thread: 564 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 565 break; 566 } 567 } 568 569 // Create the Win32 thread 570 // 571 // Contrary to what MSDN document says, "stack_size" in _beginthreadex() 572 // does not specify stack size. Instead, it specifies the size of 573 // initially committed space. The stack size is determined by 574 // PE header in the executable. If the committed "stack_size" is larger 575 // than default value in the PE header, the stack is rounded up to the 576 // nearest multiple of 1MB. For example if the launcher has default 577 // stack size of 320k, specifying any size less than 320k does not 578 // affect the actual stack size at all, it only affects the initial 579 // commitment. On the other hand, specifying 'stack_size' larger than 580 // default value may cause significant increase in memory usage, because 581 // not only the stack space will be rounded up to MB, but also the 582 // entire space is committed upfront. 583 // 584 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION' 585 // for CreateThread() that can treat 'stack_size' as stack size. However we 586 // are not supposed to call CreateThread() directly according to MSDN 587 // document because JVM uses C runtime library. The good news is that the 588 // flag appears to work with _beginthredex() as well. 589 590#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION 591#define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000) 592#endif 593 594 HANDLE thread_handle = 595 (HANDLE)_beginthreadex(NULL, 596 (unsigned)stack_size, 597 (unsigned (__stdcall *)(void*)) java_start, 598 thread, 599 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, 600 &thread_id); 601 if (thread_handle == NULL) { 602 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again 603 // without the flag. 604 thread_handle = 605 (HANDLE)_beginthreadex(NULL, 606 (unsigned)stack_size, 607 (unsigned (__stdcall *)(void*)) java_start, 608 thread, 609 CREATE_SUSPENDED, 610 &thread_id); 611 } 612 if (thread_handle == NULL) { 613 // Need to clean up stuff we've allocated so far 614 CloseHandle(osthread->interrupt_event()); 615 thread->set_osthread(NULL); 616 delete osthread; 617 return NULL; 618 } 619 620 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count); 621 622 // Store info on the Win32 thread into the OSThread 623 osthread->set_thread_handle(thread_handle); 624 osthread->set_thread_id(thread_id); 625 626 // Initial thread state is INITIALIZED, not SUSPENDED 627 osthread->set_state(INITIALIZED); 628 629 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 630 return true; 631} 632 633 634// Free Win32 resources related to the OSThread 635void os::free_thread(OSThread* osthread) { 636 assert(osthread != NULL, "osthread not set"); 637 CloseHandle(osthread->thread_handle()); 638 CloseHandle(osthread->interrupt_event()); 639 delete osthread; 640} 641 642static jlong first_filetime; 643static jlong initial_performance_count; 644static jlong performance_frequency; 645 646 647jlong as_long(LARGE_INTEGER x) { 648 jlong result = 0; // initialization to avoid warning 649 set_high(&result, x.HighPart); 650 set_low(&result, x.LowPart); 651 return result; 652} 653 654 655jlong os::elapsed_counter() { 656 LARGE_INTEGER count; 657 if (win32::_has_performance_count) { 658 QueryPerformanceCounter(&count); 659 return as_long(count) - initial_performance_count; 660 } else { 661 FILETIME wt; 662 GetSystemTimeAsFileTime(&wt); 663 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime); 664 } 665} 666 667 668jlong os::elapsed_frequency() { 669 if (win32::_has_performance_count) { 670 return performance_frequency; 671 } else { 672 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601. 673 return 10000000; 674 } 675} 676 677 678julong os::available_memory() { 679 return win32::available_memory(); 680} 681 682julong os::win32::available_memory() { 683 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 684 // value if total memory is larger than 4GB 685 MEMORYSTATUSEX ms; 686 ms.dwLength = sizeof(ms); 687 GlobalMemoryStatusEx(&ms); 688 689 return (julong)ms.ullAvailPhys; 690} 691 692julong os::physical_memory() { 693 return win32::physical_memory(); 694} 695 696bool os::has_allocatable_memory_limit(julong* limit) { 697 MEMORYSTATUSEX ms; 698 ms.dwLength = sizeof(ms); 699 GlobalMemoryStatusEx(&ms); 700#ifdef _LP64 701 *limit = (julong)ms.ullAvailVirtual; 702 return true; 703#else 704 // Limit to 1400m because of the 2gb address space wall 705 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual); 706 return true; 707#endif 708} 709 710// VC6 lacks DWORD_PTR 711#if _MSC_VER < 1300 712typedef UINT_PTR DWORD_PTR; 713#endif 714 715int os::active_processor_count() { 716 DWORD_PTR lpProcessAffinityMask = 0; 717 DWORD_PTR lpSystemAffinityMask = 0; 718 int proc_count = processor_count(); 719 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte && 720 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) { 721 // Nof active processors is number of bits in process affinity mask 722 int bitcount = 0; 723 while (lpProcessAffinityMask != 0) { 724 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1); 725 bitcount++; 726 } 727 return bitcount; 728 } else { 729 return proc_count; 730 } 731} 732 733void os::set_native_thread_name(const char *name) { 734 // Not yet implemented. 735 return; 736} 737 738bool os::distribute_processes(uint length, uint* distribution) { 739 // Not yet implemented. 740 return false; 741} 742 743bool os::bind_to_processor(uint processor_id) { 744 // Not yet implemented. 745 return false; 746} 747 748void os::win32::initialize_performance_counter() { 749 LARGE_INTEGER count; 750 if (QueryPerformanceFrequency(&count)) { 751 win32::_has_performance_count = 1; 752 performance_frequency = as_long(count); 753 QueryPerformanceCounter(&count); 754 initial_performance_count = as_long(count); 755 } else { 756 win32::_has_performance_count = 0; 757 FILETIME wt; 758 GetSystemTimeAsFileTime(&wt); 759 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 760 } 761} 762 763 764double os::elapsedTime() { 765 return (double) elapsed_counter() / (double) elapsed_frequency(); 766} 767 768 769// Windows format: 770// The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601. 771// Java format: 772// Java standards require the number of milliseconds since 1/1/1970 773 774// Constant offset - calculated using offset() 775static jlong _offset = 116444736000000000; 776// Fake time counter for reproducible results when debugging 777static jlong fake_time = 0; 778 779#ifdef ASSERT 780// Just to be safe, recalculate the offset in debug mode 781static jlong _calculated_offset = 0; 782static int _has_calculated_offset = 0; 783 784jlong offset() { 785 if (_has_calculated_offset) return _calculated_offset; 786 SYSTEMTIME java_origin; 787 java_origin.wYear = 1970; 788 java_origin.wMonth = 1; 789 java_origin.wDayOfWeek = 0; // ignored 790 java_origin.wDay = 1; 791 java_origin.wHour = 0; 792 java_origin.wMinute = 0; 793 java_origin.wSecond = 0; 794 java_origin.wMilliseconds = 0; 795 FILETIME jot; 796 if (!SystemTimeToFileTime(&java_origin, &jot)) { 797 fatal(err_msg("Error = %d\nWindows error", GetLastError())); 798 } 799 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime); 800 _has_calculated_offset = 1; 801 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal"); 802 return _calculated_offset; 803} 804#else 805jlong offset() { 806 return _offset; 807} 808#endif 809 810jlong windows_to_java_time(FILETIME wt) { 811 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime); 812 return (a - offset()) / 10000; 813} 814 815FILETIME java_to_windows_time(jlong l) { 816 jlong a = (l * 10000) + offset(); 817 FILETIME result; 818 result.dwHighDateTime = high(a); 819 result.dwLowDateTime = low(a); 820 return result; 821} 822 823bool os::supports_vtime() { return true; } 824bool os::enable_vtime() { return false; } 825bool os::vtime_enabled() { return false; } 826 827double os::elapsedVTime() { 828 FILETIME created; 829 FILETIME exited; 830 FILETIME kernel; 831 FILETIME user; 832 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) { 833 // the resolution of windows_to_java_time() should be sufficient (ms) 834 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS; 835 } else { 836 return elapsedTime(); 837 } 838} 839 840jlong os::javaTimeMillis() { 841 if (UseFakeTimers) { 842 return fake_time++; 843 } else { 844 FILETIME wt; 845 GetSystemTimeAsFileTime(&wt); 846 return windows_to_java_time(wt); 847 } 848} 849 850jlong os::javaTimeNanos() { 851 if (!win32::_has_performance_count) { 852 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do. 853 } else { 854 LARGE_INTEGER current_count; 855 QueryPerformanceCounter(¤t_count); 856 double current = as_long(current_count); 857 double freq = performance_frequency; 858 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC); 859 return time; 860 } 861} 862 863void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 864 if (!win32::_has_performance_count) { 865 // javaTimeMillis() doesn't have much percision, 866 // but it is not going to wrap -- so all 64 bits 867 info_ptr->max_value = ALL_64_BITS; 868 869 // this is a wall clock timer, so may skip 870 info_ptr->may_skip_backward = true; 871 info_ptr->may_skip_forward = true; 872 } else { 873 jlong freq = performance_frequency; 874 if (freq < NANOSECS_PER_SEC) { 875 // the performance counter is 64 bits and we will 876 // be multiplying it -- so no wrap in 64 bits 877 info_ptr->max_value = ALL_64_BITS; 878 } else if (freq > NANOSECS_PER_SEC) { 879 // use the max value the counter can reach to 880 // determine the max value which could be returned 881 julong max_counter = (julong)ALL_64_BITS; 882 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC)); 883 } else { 884 // the performance counter is 64 bits and we will 885 // be using it directly -- so no wrap in 64 bits 886 info_ptr->max_value = ALL_64_BITS; 887 } 888 889 // using a counter, so no skipping 890 info_ptr->may_skip_backward = false; 891 info_ptr->may_skip_forward = false; 892 } 893 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 894} 895 896char* os::local_time_string(char *buf, size_t buflen) { 897 SYSTEMTIME st; 898 GetLocalTime(&st); 899 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 900 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); 901 return buf; 902} 903 904bool os::getTimesSecs(double* process_real_time, 905 double* process_user_time, 906 double* process_system_time) { 907 HANDLE h_process = GetCurrentProcess(); 908 FILETIME create_time, exit_time, kernel_time, user_time; 909 BOOL result = GetProcessTimes(h_process, 910 &create_time, 911 &exit_time, 912 &kernel_time, 913 &user_time); 914 if (result != 0) { 915 FILETIME wt; 916 GetSystemTimeAsFileTime(&wt); 917 jlong rtc_millis = windows_to_java_time(wt); 918 jlong user_millis = windows_to_java_time(user_time); 919 jlong system_millis = windows_to_java_time(kernel_time); 920 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS); 921 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS); 922 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS); 923 return true; 924 } else { 925 return false; 926 } 927} 928 929void os::shutdown() { 930 931 // allow PerfMemory to attempt cleanup of any persistent resources 932 perfMemory_exit(); 933 934 // flush buffered output, finish log files 935 ostream_abort(); 936 937 // Check for abort hook 938 abort_hook_t abort_hook = Arguments::abort_hook(); 939 if (abort_hook != NULL) { 940 abort_hook(); 941 } 942} 943 944 945static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION, 946 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION); 947 948void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) { 949 HINSTANCE dbghelp; 950 EXCEPTION_POINTERS ep; 951 MINIDUMP_EXCEPTION_INFORMATION mei; 952 MINIDUMP_EXCEPTION_INFORMATION* pmei; 953 954 HANDLE hProcess = GetCurrentProcess(); 955 DWORD processId = GetCurrentProcessId(); 956 HANDLE dumpFile; 957 MINIDUMP_TYPE dumpType; 958 static const char* cwd; 959 960// Default is to always create dump for debug builds, on product builds only dump on server versions of Windows. 961#ifndef ASSERT 962 // If running on a client version of Windows and user has not explicitly enabled dumping 963 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) { 964 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false); 965 return; 966 // If running on a server version of Windows and user has explictly disabled dumping 967 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) { 968 VMError::report_coredump_status("Minidump has been disabled from the command line", false); 969 return; 970 } 971#else 972 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) { 973 VMError::report_coredump_status("Minidump has been disabled from the command line", false); 974 return; 975 } 976#endif 977 978 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0); 979 980 if (dbghelp == NULL) { 981 VMError::report_coredump_status("Failed to load dbghelp.dll", false); 982 return; 983 } 984 985 _MiniDumpWriteDump = CAST_TO_FN_PTR( 986 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION, 987 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION), 988 GetProcAddress(dbghelp, "MiniDumpWriteDump")); 989 990 if (_MiniDumpWriteDump == NULL) { 991 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false); 992 return; 993 } 994 995 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData); 996 997// Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with 998// API_VERSION_NUMBER 11 or higher contains the ones we want though 999#if API_VERSION_NUMBER >= 11 1000 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | 1001 MiniDumpWithUnloadedModules); 1002#endif 1003 1004 cwd = get_current_directory(NULL, 0); 1005 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp", cwd, current_process_id()); 1006 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); 1007 1008 if (dumpFile == INVALID_HANDLE_VALUE) { 1009 VMError::report_coredump_status("Failed to create file for dumping", false); 1010 return; 1011 } 1012 if (exceptionRecord != NULL && contextRecord != NULL) { 1013 ep.ContextRecord = (PCONTEXT) contextRecord; 1014 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord; 1015 1016 mei.ThreadId = GetCurrentThreadId(); 1017 mei.ExceptionPointers = &ep; 1018 pmei = &mei; 1019 } else { 1020 pmei = NULL; 1021 } 1022 1023 1024 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all 1025 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then. 1026 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false && 1027 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) { 1028 DWORD error = GetLastError(); 1029 LPTSTR msgbuf = NULL; 1030 1031 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | 1032 FORMAT_MESSAGE_FROM_SYSTEM | 1033 FORMAT_MESSAGE_IGNORE_INSERTS, 1034 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) { 1035 1036 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf); 1037 LocalFree(msgbuf); 1038 } else { 1039 // Call to FormatMessage failed, just include the result from GetLastError 1040 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error); 1041 } 1042 VMError::report_coredump_status(buffer, false); 1043 } else { 1044 VMError::report_coredump_status(buffer, true); 1045 } 1046 1047 CloseHandle(dumpFile); 1048} 1049 1050 1051 1052void os::abort(bool dump_core) 1053{ 1054 os::shutdown(); 1055 // no core dump on Windows 1056 ::exit(1); 1057} 1058 1059// Die immediately, no exit hook, no abort hook, no cleanup. 1060void os::die() { 1061 _exit(-1); 1062} 1063 1064// Directory routines copied from src/win32/native/java/io/dirent_md.c 1065// * dirent_md.c 1.15 00/02/02 1066// 1067// The declarations for DIR and struct dirent are in jvm_win32.h. 1068 1069/* Caller must have already run dirname through JVM_NativePath, which removes 1070 duplicate slashes and converts all instances of '/' into '\\'. */ 1071 1072DIR * 1073os::opendir(const char *dirname) 1074{ 1075 assert(dirname != NULL, "just checking"); // hotspot change 1076 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal); 1077 DWORD fattr; // hotspot change 1078 char alt_dirname[4] = { 0, 0, 0, 0 }; 1079 1080 if (dirp == 0) { 1081 errno = ENOMEM; 1082 return 0; 1083 } 1084 1085 /* 1086 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it 1087 * as a directory in FindFirstFile(). We detect this case here and 1088 * prepend the current drive name. 1089 */ 1090 if (dirname[1] == '\0' && dirname[0] == '\\') { 1091 alt_dirname[0] = _getdrive() + 'A' - 1; 1092 alt_dirname[1] = ':'; 1093 alt_dirname[2] = '\\'; 1094 alt_dirname[3] = '\0'; 1095 dirname = alt_dirname; 1096 } 1097 1098 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal); 1099 if (dirp->path == 0) { 1100 free(dirp, mtInternal); 1101 errno = ENOMEM; 1102 return 0; 1103 } 1104 strcpy(dirp->path, dirname); 1105 1106 fattr = GetFileAttributes(dirp->path); 1107 if (fattr == 0xffffffff) { 1108 free(dirp->path, mtInternal); 1109 free(dirp, mtInternal); 1110 errno = ENOENT; 1111 return 0; 1112 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) { 1113 free(dirp->path, mtInternal); 1114 free(dirp, mtInternal); 1115 errno = ENOTDIR; 1116 return 0; 1117 } 1118 1119 /* Append "*.*", or possibly "\\*.*", to path */ 1120 if (dirp->path[1] == ':' 1121 && (dirp->path[2] == '\0' 1122 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) { 1123 /* No '\\' needed for cases like "Z:" or "Z:\" */ 1124 strcat(dirp->path, "*.*"); 1125 } else { 1126 strcat(dirp->path, "\\*.*"); 1127 } 1128 1129 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data); 1130 if (dirp->handle == INVALID_HANDLE_VALUE) { 1131 if (GetLastError() != ERROR_FILE_NOT_FOUND) { 1132 free(dirp->path, mtInternal); 1133 free(dirp, mtInternal); 1134 errno = EACCES; 1135 return 0; 1136 } 1137 } 1138 return dirp; 1139} 1140 1141/* parameter dbuf unused on Windows */ 1142 1143struct dirent * 1144os::readdir(DIR *dirp, dirent *dbuf) 1145{ 1146 assert(dirp != NULL, "just checking"); // hotspot change 1147 if (dirp->handle == INVALID_HANDLE_VALUE) { 1148 return 0; 1149 } 1150 1151 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName); 1152 1153 if (!FindNextFile(dirp->handle, &dirp->find_data)) { 1154 if (GetLastError() == ERROR_INVALID_HANDLE) { 1155 errno = EBADF; 1156 return 0; 1157 } 1158 FindClose(dirp->handle); 1159 dirp->handle = INVALID_HANDLE_VALUE; 1160 } 1161 1162 return &dirp->dirent; 1163} 1164 1165int 1166os::closedir(DIR *dirp) 1167{ 1168 assert(dirp != NULL, "just checking"); // hotspot change 1169 if (dirp->handle != INVALID_HANDLE_VALUE) { 1170 if (!FindClose(dirp->handle)) { 1171 errno = EBADF; 1172 return -1; 1173 } 1174 dirp->handle = INVALID_HANDLE_VALUE; 1175 } 1176 free(dirp->path, mtInternal); 1177 free(dirp, mtInternal); 1178 return 0; 1179} 1180 1181// This must be hard coded because it's the system's temporary 1182// directory not the java application's temp directory, ala java.io.tmpdir. 1183const char* os::get_temp_directory() { 1184 static char path_buf[MAX_PATH]; 1185 if (GetTempPath(MAX_PATH, path_buf)>0) 1186 return path_buf; 1187 else{ 1188 path_buf[0]='\0'; 1189 return path_buf; 1190 } 1191} 1192 1193static bool file_exists(const char* filename) { 1194 if (filename == NULL || strlen(filename) == 0) { 1195 return false; 1196 } 1197 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES; 1198} 1199 1200bool os::dll_build_name(char *buffer, size_t buflen, 1201 const char* pname, const char* fname) { 1202 bool retval = false; 1203 const size_t pnamelen = pname ? strlen(pname) : 0; 1204 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0; 1205 1206 // Return error on buffer overflow. 1207 if (pnamelen + strlen(fname) + 10 > buflen) { 1208 return retval; 1209 } 1210 1211 if (pnamelen == 0) { 1212 jio_snprintf(buffer, buflen, "%s.dll", fname); 1213 retval = true; 1214 } else if (c == ':' || c == '\\') { 1215 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname); 1216 retval = true; 1217 } else if (strchr(pname, *os::path_separator()) != NULL) { 1218 int n; 1219 char** pelements = split_path(pname, &n); 1220 if (pelements == NULL) { 1221 return false; 1222 } 1223 for (int i = 0; i < n; i++) { 1224 char* path = pelements[i]; 1225 // Really shouldn't be NULL, but check can't hurt 1226 size_t plen = (path == NULL) ? 0 : strlen(path); 1227 if (plen == 0) { 1228 continue; // skip the empty path values 1229 } 1230 const char lastchar = path[plen - 1]; 1231 if (lastchar == ':' || lastchar == '\\') { 1232 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname); 1233 } else { 1234 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname); 1235 } 1236 if (file_exists(buffer)) { 1237 retval = true; 1238 break; 1239 } 1240 } 1241 // release the storage 1242 for (int i = 0; i < n; i++) { 1243 if (pelements[i] != NULL) { 1244 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); 1245 } 1246 } 1247 if (pelements != NULL) { 1248 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); 1249 } 1250 } else { 1251 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname); 1252 retval = true; 1253 } 1254 return retval; 1255} 1256 1257// Needs to be in os specific directory because windows requires another 1258// header file <direct.h> 1259const char* os::get_current_directory(char *buf, size_t buflen) { 1260 int n = static_cast<int>(buflen); 1261 if (buflen > INT_MAX) n = INT_MAX; 1262 return _getcwd(buf, n); 1263} 1264 1265//----------------------------------------------------------- 1266// Helper functions for fatal error handler 1267#ifdef _WIN64 1268// Helper routine which returns true if address in 1269// within the NTDLL address space. 1270// 1271static bool _addr_in_ntdll( address addr ) 1272{ 1273 HMODULE hmod; 1274 MODULEINFO minfo; 1275 1276 hmod = GetModuleHandle("NTDLL.DLL"); 1277 if (hmod == NULL) return false; 1278 if (!os::PSApiDll::GetModuleInformation( GetCurrentProcess(), hmod, 1279 &minfo, sizeof(MODULEINFO)) ) 1280 return false; 1281 1282 if ((addr >= minfo.lpBaseOfDll) && 1283 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) 1284 return true; 1285 else 1286 return false; 1287} 1288#endif 1289 1290 1291// Enumerate all modules for a given process ID 1292// 1293// Notice that Windows 95/98/Me and Windows NT/2000/XP have 1294// different API for doing this. We use PSAPI.DLL on NT based 1295// Windows and ToolHelp on 95/98/Me. 1296 1297// Callback function that is called by enumerate_modules() on 1298// every DLL module. 1299// Input parameters: 1300// int pid, 1301// char* module_file_name, 1302// address module_base_addr, 1303// unsigned module_size, 1304// void* param 1305typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *); 1306 1307// enumerate_modules for Windows NT, using PSAPI 1308static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param) 1309{ 1310 HANDLE hProcess; 1311 1312# define MAX_NUM_MODULES 128 1313 HMODULE modules[MAX_NUM_MODULES]; 1314 static char filename[MAX_PATH]; 1315 int result = 0; 1316 1317 if (!os::PSApiDll::PSApiAvailable()) { 1318 return 0; 1319 } 1320 1321 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, 1322 FALSE, pid); 1323 if (hProcess == NULL) return 0; 1324 1325 DWORD size_needed; 1326 if (!os::PSApiDll::EnumProcessModules(hProcess, modules, 1327 sizeof(modules), &size_needed)) { 1328 CloseHandle(hProcess); 1329 return 0; 1330 } 1331 1332 // number of modules that are currently loaded 1333 int num_modules = size_needed / sizeof(HMODULE); 1334 1335 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) { 1336 // Get Full pathname: 1337 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i], 1338 filename, sizeof(filename))) { 1339 filename[0] = '\0'; 1340 } 1341 1342 MODULEINFO modinfo; 1343 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i], 1344 &modinfo, sizeof(modinfo))) { 1345 modinfo.lpBaseOfDll = NULL; 1346 modinfo.SizeOfImage = 0; 1347 } 1348 1349 // Invoke callback function 1350 result = func(pid, filename, (address)modinfo.lpBaseOfDll, 1351 modinfo.SizeOfImage, param); 1352 if (result) break; 1353 } 1354 1355 CloseHandle(hProcess); 1356 return result; 1357} 1358 1359 1360// enumerate_modules for Windows 95/98/ME, using TOOLHELP 1361static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param) 1362{ 1363 HANDLE hSnapShot; 1364 static MODULEENTRY32 modentry; 1365 int result = 0; 1366 1367 if (!os::Kernel32Dll::HelpToolsAvailable()) { 1368 return 0; 1369 } 1370 1371 // Get a handle to a Toolhelp snapshot of the system 1372 hSnapShot = os::Kernel32Dll::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid); 1373 if (hSnapShot == INVALID_HANDLE_VALUE) { 1374 return FALSE; 1375 } 1376 1377 // iterate through all modules 1378 modentry.dwSize = sizeof(MODULEENTRY32); 1379 bool not_done = os::Kernel32Dll::Module32First( hSnapShot, &modentry ) != 0; 1380 1381 while (not_done) { 1382 // invoke the callback 1383 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr, 1384 modentry.modBaseSize, param); 1385 if (result) break; 1386 1387 modentry.dwSize = sizeof(MODULEENTRY32); 1388 not_done = os::Kernel32Dll::Module32Next( hSnapShot, &modentry ) != 0; 1389 } 1390 1391 CloseHandle(hSnapShot); 1392 return result; 1393} 1394 1395int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param ) 1396{ 1397 // Get current process ID if caller doesn't provide it. 1398 if (!pid) pid = os::current_process_id(); 1399 1400 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param); 1401 else return _enumerate_modules_windows(pid, func, param); 1402} 1403 1404struct _modinfo { 1405 address addr; 1406 char* full_path; // point to a char buffer 1407 int buflen; // size of the buffer 1408 address base_addr; 1409}; 1410 1411static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr, 1412 unsigned size, void * param) { 1413 struct _modinfo *pmod = (struct _modinfo *)param; 1414 if (!pmod) return -1; 1415 1416 if (base_addr <= pmod->addr && 1417 base_addr+size > pmod->addr) { 1418 // if a buffer is provided, copy path name to the buffer 1419 if (pmod->full_path) { 1420 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname); 1421 } 1422 pmod->base_addr = base_addr; 1423 return 1; 1424 } 1425 return 0; 1426} 1427 1428bool os::dll_address_to_library_name(address addr, char* buf, 1429 int buflen, int* offset) { 1430 // buf is not optional, but offset is optional 1431 assert(buf != NULL, "sanity check"); 1432 1433// NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always 1434// return the full path to the DLL file, sometimes it returns path 1435// to the corresponding PDB file (debug info); sometimes it only 1436// returns partial path, which makes life painful. 1437 1438 struct _modinfo mi; 1439 mi.addr = addr; 1440 mi.full_path = buf; 1441 mi.buflen = buflen; 1442 int pid = os::current_process_id(); 1443 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) { 1444 // buf already contains path name 1445 if (offset) *offset = addr - mi.base_addr; 1446 return true; 1447 } 1448 1449 buf[0] = '\0'; 1450 if (offset) *offset = -1; 1451 return false; 1452} 1453 1454bool os::dll_address_to_function_name(address addr, char *buf, 1455 int buflen, int *offset) { 1456 // buf is not optional, but offset is optional 1457 assert(buf != NULL, "sanity check"); 1458 1459 if (Decoder::decode(addr, buf, buflen, offset)) { 1460 return true; 1461 } 1462 if (offset != NULL) *offset = -1; 1463 buf[0] = '\0'; 1464 return false; 1465} 1466 1467// save the start and end address of jvm.dll into param[0] and param[1] 1468static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr, 1469 unsigned size, void * param) { 1470 if (!param) return -1; 1471 1472 if (base_addr <= (address)_locate_jvm_dll && 1473 base_addr+size > (address)_locate_jvm_dll) { 1474 ((address*)param)[0] = base_addr; 1475 ((address*)param)[1] = base_addr + size; 1476 return 1; 1477 } 1478 return 0; 1479} 1480 1481address vm_lib_location[2]; // start and end address of jvm.dll 1482 1483// check if addr is inside jvm.dll 1484bool os::address_is_in_vm(address addr) { 1485 if (!vm_lib_location[0] || !vm_lib_location[1]) { 1486 int pid = os::current_process_id(); 1487 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) { 1488 assert(false, "Can't find jvm module."); 1489 return false; 1490 } 1491 } 1492 1493 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]); 1494} 1495 1496// print module info; param is outputStream* 1497static int _print_module(int pid, char* fname, address base, 1498 unsigned size, void* param) { 1499 if (!param) return -1; 1500 1501 outputStream* st = (outputStream*)param; 1502 1503 address end_addr = base + size; 1504 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname); 1505 return 0; 1506} 1507 1508// Loads .dll/.so and 1509// in case of error it checks if .dll/.so was built for the 1510// same architecture as Hotspot is running on 1511void * os::dll_load(const char *name, char *ebuf, int ebuflen) 1512{ 1513 void * result = LoadLibrary(name); 1514 if (result != NULL) 1515 { 1516 return result; 1517 } 1518 1519 DWORD errcode = GetLastError(); 1520 if (errcode == ERROR_MOD_NOT_FOUND) { 1521 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1); 1522 ebuf[ebuflen-1]='\0'; 1523 return NULL; 1524 } 1525 1526 // Parsing dll below 1527 // If we can read dll-info and find that dll was built 1528 // for an architecture other than Hotspot is running in 1529 // - then print to buffer "DLL was built for a different architecture" 1530 // else call os::lasterror to obtain system error message 1531 1532 // Read system error message into ebuf 1533 // It may or may not be overwritten below (in the for loop and just above) 1534 lasterror(ebuf, (size_t) ebuflen); 1535 ebuf[ebuflen-1]='\0'; 1536 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0); 1537 if (file_descriptor<0) 1538 { 1539 return NULL; 1540 } 1541 1542 uint32_t signature_offset; 1543 uint16_t lib_arch=0; 1544 bool failed_to_get_lib_arch= 1545 ( 1546 //Go to position 3c in the dll 1547 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0) 1548 || 1549 // Read loacation of signature 1550 (sizeof(signature_offset)!= 1551 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset)))) 1552 || 1553 //Go to COFF File Header in dll 1554 //that is located after"signature" (4 bytes long) 1555 (os::seek_to_file_offset(file_descriptor, 1556 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0) 1557 || 1558 //Read field that contains code of architecture 1559 // that dll was build for 1560 (sizeof(lib_arch)!= 1561 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch)))) 1562 ); 1563 1564 ::close(file_descriptor); 1565 if (failed_to_get_lib_arch) 1566 { 1567 // file i/o error - report os::lasterror(...) msg 1568 return NULL; 1569 } 1570 1571 typedef struct 1572 { 1573 uint16_t arch_code; 1574 char* arch_name; 1575 } arch_t; 1576 1577 static const arch_t arch_array[]={ 1578 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"}, 1579 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}, 1580 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"} 1581 }; 1582 #if (defined _M_IA64) 1583 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64; 1584 #elif (defined _M_AMD64) 1585 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64; 1586 #elif (defined _M_IX86) 1587 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386; 1588 #else 1589 #error Method os::dll_load requires that one of following \ 1590 is defined :_M_IA64,_M_AMD64 or _M_IX86 1591 #endif 1592 1593 1594 // Obtain a string for printf operation 1595 // lib_arch_str shall contain string what platform this .dll was built for 1596 // running_arch_str shall string contain what platform Hotspot was built for 1597 char *running_arch_str=NULL,*lib_arch_str=NULL; 1598 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++) 1599 { 1600 if (lib_arch==arch_array[i].arch_code) 1601 lib_arch_str=arch_array[i].arch_name; 1602 if (running_arch==arch_array[i].arch_code) 1603 running_arch_str=arch_array[i].arch_name; 1604 } 1605 1606 assert(running_arch_str, 1607 "Didn't find runing architecture code in arch_array"); 1608 1609 // If the architure is right 1610 // but some other error took place - report os::lasterror(...) msg 1611 if (lib_arch == running_arch) 1612 { 1613 return NULL; 1614 } 1615 1616 if (lib_arch_str!=NULL) 1617 { 1618 ::_snprintf(ebuf, ebuflen-1, 1619 "Can't load %s-bit .dll on a %s-bit platform", 1620 lib_arch_str,running_arch_str); 1621 } 1622 else 1623 { 1624 // don't know what architecture this dll was build for 1625 ::_snprintf(ebuf, ebuflen-1, 1626 "Can't load this .dll (machine code=0x%x) on a %s-bit platform", 1627 lib_arch,running_arch_str); 1628 } 1629 1630 return NULL; 1631} 1632 1633 1634void os::print_dll_info(outputStream *st) { 1635 int pid = os::current_process_id(); 1636 st->print_cr("Dynamic libraries:"); 1637 enumerate_modules(pid, _print_module, (void *)st); 1638} 1639 1640void os::print_os_info_brief(outputStream* st) { 1641 os::print_os_info(st); 1642} 1643 1644void os::print_os_info(outputStream* st) { 1645 st->print("OS:"); 1646 1647 os::win32::print_windows_version(st); 1648} 1649 1650void os::win32::print_windows_version(outputStream* st) { 1651 OSVERSIONINFOEX osvi; 1652 SYSTEM_INFO si; 1653 1654 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX)); 1655 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 1656 1657 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) { 1658 st->print_cr("N/A"); 1659 return; 1660 } 1661 1662 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion; 1663 1664 ZeroMemory(&si, sizeof(SYSTEM_INFO)); 1665 if (os_vers >= 5002) { 1666 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could 1667 // find out whether we are running on 64 bit processor or not. 1668 if (os::Kernel32Dll::GetNativeSystemInfoAvailable()) { 1669 os::Kernel32Dll::GetNativeSystemInfo(&si); 1670 } else { 1671 GetSystemInfo(&si); 1672 } 1673 } 1674 1675 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) { 1676 switch (os_vers) { 1677 case 3051: st->print(" Windows NT 3.51"); break; 1678 case 4000: st->print(" Windows NT 4.0"); break; 1679 case 5000: st->print(" Windows 2000"); break; 1680 case 5001: st->print(" Windows XP"); break; 1681 case 5002: 1682 if (osvi.wProductType == VER_NT_WORKSTATION && 1683 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1684 st->print(" Windows XP x64 Edition"); 1685 } else { 1686 st->print(" Windows Server 2003 family"); 1687 } 1688 break; 1689 1690 case 6000: 1691 if (osvi.wProductType == VER_NT_WORKSTATION) { 1692 st->print(" Windows Vista"); 1693 } else { 1694 st->print(" Windows Server 2008"); 1695 } 1696 break; 1697 1698 case 6001: 1699 if (osvi.wProductType == VER_NT_WORKSTATION) { 1700 st->print(" Windows 7"); 1701 } else { 1702 st->print(" Windows Server 2008 R2"); 1703 } 1704 break; 1705 1706 case 6002: 1707 if (osvi.wProductType == VER_NT_WORKSTATION) { 1708 st->print(" Windows 8"); 1709 } else { 1710 st->print(" Windows Server 2012"); 1711 } 1712 break; 1713 1714 case 6003: 1715 if (osvi.wProductType == VER_NT_WORKSTATION) { 1716 st->print(" Windows 8.1"); 1717 } else { 1718 st->print(" Windows Server 2012 R2"); 1719 } 1720 break; 1721 1722 default: // future os 1723 // Unrecognized windows, print out its major and minor versions 1724 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1725 } 1726 } else { 1727 switch (os_vers) { 1728 case 4000: st->print(" Windows 95"); break; 1729 case 4010: st->print(" Windows 98"); break; 1730 case 4090: st->print(" Windows Me"); break; 1731 default: // future windows, print out its major and minor versions 1732 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); 1733 } 1734 } 1735 1736 if (os_vers >= 6000 && si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) { 1737 st->print(" , 64 bit"); 1738 } 1739 1740 st->print(" Build %d", osvi.dwBuildNumber); 1741 st->print(" %s", osvi.szCSDVersion); // service pack 1742 st->cr(); 1743} 1744 1745void os::pd_print_cpu_info(outputStream* st) { 1746 // Nothing to do for now. 1747} 1748 1749void os::print_memory_info(outputStream* st) { 1750 st->print("Memory:"); 1751 st->print(" %dk page", os::vm_page_size()>>10); 1752 1753 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect 1754 // value if total memory is larger than 4GB 1755 MEMORYSTATUSEX ms; 1756 ms.dwLength = sizeof(ms); 1757 GlobalMemoryStatusEx(&ms); 1758 1759 st->print(", physical %uk", os::physical_memory() >> 10); 1760 st->print("(%uk free)", os::available_memory() >> 10); 1761 1762 st->print(", swap %uk", ms.ullTotalPageFile >> 10); 1763 st->print("(%uk free)", ms.ullAvailPageFile >> 10); 1764 st->cr(); 1765} 1766 1767void os::print_siginfo(outputStream *st, void *siginfo) { 1768 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo; 1769 st->print("siginfo:"); 1770 st->print(" ExceptionCode=0x%x", er->ExceptionCode); 1771 1772 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 1773 er->NumberParameters >= 2) { 1774 switch (er->ExceptionInformation[0]) { 1775 case 0: st->print(", reading address"); break; 1776 case 1: st->print(", writing address"); break; 1777 default: st->print(", ExceptionInformation=" INTPTR_FORMAT, 1778 er->ExceptionInformation[0]); 1779 } 1780 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]); 1781 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR && 1782 er->NumberParameters >= 2 && UseSharedSpaces) { 1783 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1784 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) { 1785 st->print("\n\nError accessing class data sharing archive." \ 1786 " Mapped file inaccessible during execution, " \ 1787 " possible disk/network problem."); 1788 } 1789 } else { 1790 int num = er->NumberParameters; 1791 if (num > 0) { 1792 st->print(", ExceptionInformation="); 1793 for (int i = 0; i < num; i++) { 1794 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]); 1795 } 1796 } 1797 } 1798 st->cr(); 1799} 1800 1801void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1802 // do nothing 1803} 1804 1805static char saved_jvm_path[MAX_PATH] = {0}; 1806 1807// Find the full path to the current module, jvm.dll 1808void os::jvm_path(char *buf, jint buflen) { 1809 // Error checking. 1810 if (buflen < MAX_PATH) { 1811 assert(false, "must use a large-enough buffer"); 1812 buf[0] = '\0'; 1813 return; 1814 } 1815 // Lazy resolve the path to current module. 1816 if (saved_jvm_path[0] != 0) { 1817 strcpy(buf, saved_jvm_path); 1818 return; 1819 } 1820 1821 buf[0] = '\0'; 1822 if (Arguments::sun_java_launcher_is_altjvm()) { 1823 // Support for the java launcher's '-XXaltjvm=<path>' option. Check 1824 // for a JAVA_HOME environment variable and fix up the path so it 1825 // looks like jvm.dll is installed there (append a fake suffix 1826 // hotspot/jvm.dll). 1827 char* java_home_var = ::getenv("JAVA_HOME"); 1828 if (java_home_var != NULL && java_home_var[0] != 0) { 1829 strncpy(buf, java_home_var, buflen); 1830 1831 // determine if this is a legacy image or modules image 1832 // modules image doesn't have "jre" subdirectory 1833 size_t len = strlen(buf); 1834 char* jrebin_p = buf + len; 1835 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\"); 1836 if (0 != _access(buf, 0)) { 1837 jio_snprintf(jrebin_p, buflen-len, "\\bin\\"); 1838 } 1839 len = strlen(buf); 1840 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll"); 1841 } 1842 } 1843 1844 if (buf[0] == '\0') { 1845 GetModuleFileName(vm_lib_handle, buf, buflen); 1846 } 1847 strcpy(saved_jvm_path, buf); 1848} 1849 1850 1851void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1852#ifndef _WIN64 1853 st->print("_"); 1854#endif 1855} 1856 1857 1858void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1859#ifndef _WIN64 1860 st->print("@%d", args_size * sizeof(int)); 1861#endif 1862} 1863 1864// This method is a copy of JDK's sysGetLastErrorString 1865// from src/windows/hpi/src/system_md.c 1866 1867size_t os::lasterror(char* buf, size_t len) { 1868 DWORD errval; 1869 1870 if ((errval = GetLastError()) != 0) { 1871 // DOS error 1872 size_t n = (size_t)FormatMessage( 1873 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 1874 NULL, 1875 errval, 1876 0, 1877 buf, 1878 (DWORD)len, 1879 NULL); 1880 if (n > 3) { 1881 // Drop final '.', CR, LF 1882 if (buf[n - 1] == '\n') n--; 1883 if (buf[n - 1] == '\r') n--; 1884 if (buf[n - 1] == '.') n--; 1885 buf[n] = '\0'; 1886 } 1887 return n; 1888 } 1889 1890 if (errno != 0) { 1891 // C runtime error that has no corresponding DOS error code 1892 const char* s = strerror(errno); 1893 size_t n = strlen(s); 1894 if (n >= len) n = len - 1; 1895 strncpy(buf, s, n); 1896 buf[n] = '\0'; 1897 return n; 1898 } 1899 1900 return 0; 1901} 1902 1903int os::get_last_error() { 1904 DWORD error = GetLastError(); 1905 if (error == 0) 1906 error = errno; 1907 return (int)error; 1908} 1909 1910// sun.misc.Signal 1911// NOTE that this is a workaround for an apparent kernel bug where if 1912// a signal handler for SIGBREAK is installed then that signal handler 1913// takes priority over the console control handler for CTRL_CLOSE_EVENT. 1914// See bug 4416763. 1915static void (*sigbreakHandler)(int) = NULL; 1916 1917static void UserHandler(int sig, void *siginfo, void *context) { 1918 os::signal_notify(sig); 1919 // We need to reinstate the signal handler each time... 1920 os::signal(sig, (void*)UserHandler); 1921} 1922 1923void* os::user_handler() { 1924 return (void*) UserHandler; 1925} 1926 1927void* os::signal(int signal_number, void* handler) { 1928 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) { 1929 void (*oldHandler)(int) = sigbreakHandler; 1930 sigbreakHandler = (void (*)(int)) handler; 1931 return (void*) oldHandler; 1932 } else { 1933 return (void*)::signal(signal_number, (void (*)(int))handler); 1934 } 1935} 1936 1937void os::signal_raise(int signal_number) { 1938 raise(signal_number); 1939} 1940 1941// The Win32 C runtime library maps all console control events other than ^C 1942// into SIGBREAK, which makes it impossible to distinguish ^BREAK from close, 1943// logoff, and shutdown events. We therefore install our own console handler 1944// that raises SIGTERM for the latter cases. 1945// 1946static BOOL WINAPI consoleHandler(DWORD event) { 1947 switch (event) { 1948 case CTRL_C_EVENT: 1949 if (is_error_reported()) { 1950 // Ctrl-C is pressed during error reporting, likely because the error 1951 // handler fails to abort. Let VM die immediately. 1952 os::die(); 1953 } 1954 1955 os::signal_raise(SIGINT); 1956 return TRUE; 1957 break; 1958 case CTRL_BREAK_EVENT: 1959 if (sigbreakHandler != NULL) { 1960 (*sigbreakHandler)(SIGBREAK); 1961 } 1962 return TRUE; 1963 break; 1964 case CTRL_LOGOFF_EVENT: { 1965 // Don't terminate JVM if it is running in a non-interactive session, 1966 // such as a service process. 1967 USEROBJECTFLAGS flags; 1968 HANDLE handle = GetProcessWindowStation(); 1969 if (handle != NULL && 1970 GetUserObjectInformation(handle, UOI_FLAGS, &flags, 1971 sizeof(USEROBJECTFLAGS), NULL)) { 1972 // If it is a non-interactive session, let next handler to deal 1973 // with it. 1974 if ((flags.dwFlags & WSF_VISIBLE) == 0) { 1975 return FALSE; 1976 } 1977 } 1978 } 1979 case CTRL_CLOSE_EVENT: 1980 case CTRL_SHUTDOWN_EVENT: 1981 os::signal_raise(SIGTERM); 1982 return TRUE; 1983 break; 1984 default: 1985 break; 1986 } 1987 return FALSE; 1988} 1989 1990/* 1991 * The following code is moved from os.cpp for making this 1992 * code platform specific, which it is by its very nature. 1993 */ 1994 1995// Return maximum OS signal used + 1 for internal use only 1996// Used as exit signal for signal_thread 1997int os::sigexitnum_pd() { 1998 return NSIG; 1999} 2000 2001// a counter for each possible signal value, including signal_thread exit signal 2002static volatile jint pending_signals[NSIG+1] = { 0 }; 2003static HANDLE sig_sem = NULL; 2004 2005void os::signal_init_pd() { 2006 // Initialize signal structures 2007 memset((void*)pending_signals, 0, sizeof(pending_signals)); 2008 2009 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL); 2010 2011 // Programs embedding the VM do not want it to attempt to receive 2012 // events like CTRL_LOGOFF_EVENT, which are used to implement the 2013 // shutdown hooks mechanism introduced in 1.3. For example, when 2014 // the VM is run as part of a Windows NT service (i.e., a servlet 2015 // engine in a web server), the correct behavior is for any console 2016 // control handler to return FALSE, not TRUE, because the OS's 2017 // "final" handler for such events allows the process to continue if 2018 // it is a service (while terminating it if it is not a service). 2019 // To make this behavior uniform and the mechanism simpler, we 2020 // completely disable the VM's usage of these console events if -Xrs 2021 // (=ReduceSignalUsage) is specified. This means, for example, that 2022 // the CTRL-BREAK thread dump mechanism is also disabled in this 2023 // case. See bugs 4323062, 4345157, and related bugs. 2024 2025 if (!ReduceSignalUsage) { 2026 // Add a CTRL-C handler 2027 SetConsoleCtrlHandler(consoleHandler, TRUE); 2028 } 2029} 2030 2031void os::signal_notify(int signal_number) { 2032 BOOL ret; 2033 if (sig_sem != NULL) { 2034 Atomic::inc(&pending_signals[signal_number]); 2035 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2036 assert(ret != 0, "ReleaseSemaphore() failed"); 2037 } 2038} 2039 2040static int check_pending_signals(bool wait_for_signal) { 2041 DWORD ret; 2042 while (true) { 2043 for (int i = 0; i < NSIG + 1; i++) { 2044 jint n = pending_signals[i]; 2045 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2046 return i; 2047 } 2048 } 2049 if (!wait_for_signal) { 2050 return -1; 2051 } 2052 2053 JavaThread *thread = JavaThread::current(); 2054 2055 ThreadBlockInVM tbivm(thread); 2056 2057 bool threadIsSuspended; 2058 do { 2059 thread->set_suspend_equivalent(); 2060 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2061 ret = ::WaitForSingleObject(sig_sem, INFINITE); 2062 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed"); 2063 2064 // were we externally suspended while we were waiting? 2065 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2066 if (threadIsSuspended) { 2067 // 2068 // The semaphore has been incremented, but while we were waiting 2069 // another thread suspended us. We don't want to continue running 2070 // while suspended because that would surprise the thread that 2071 // suspended us. 2072 // 2073 ret = ::ReleaseSemaphore(sig_sem, 1, NULL); 2074 assert(ret != 0, "ReleaseSemaphore() failed"); 2075 2076 thread->java_suspend_self(); 2077 } 2078 } while (threadIsSuspended); 2079 } 2080} 2081 2082int os::signal_lookup() { 2083 return check_pending_signals(false); 2084} 2085 2086int os::signal_wait() { 2087 return check_pending_signals(true); 2088} 2089 2090// Implicit OS exception handling 2091 2092LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) { 2093 JavaThread* thread = JavaThread::current(); 2094 // Save pc in thread 2095#ifdef _M_IA64 2096 // Do not blow up if no thread info available. 2097 if (thread) { 2098 // Saving PRECISE pc (with slot information) in thread. 2099 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress; 2100 // Convert precise PC into "Unix" format 2101 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2); 2102 thread->set_saved_exception_pc((address)precise_pc); 2103 } 2104 // Set pc to handler 2105 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler; 2106 // Clear out psr.ri (= Restart Instruction) in order to continue 2107 // at the beginning of the target bundle. 2108 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF; 2109 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!"); 2110#elif _M_AMD64 2111 // Do not blow up if no thread info available. 2112 if (thread) { 2113 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip); 2114 } 2115 // Set pc to handler 2116 exceptionInfo->ContextRecord->Rip = (DWORD64)handler; 2117#else 2118 // Do not blow up if no thread info available. 2119 if (thread) { 2120 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip); 2121 } 2122 // Set pc to handler 2123 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler; 2124#endif 2125 2126 // Continue the execution 2127 return EXCEPTION_CONTINUE_EXECUTION; 2128} 2129 2130 2131// Used for PostMortemDump 2132extern "C" void safepoints(); 2133extern "C" void find(int x); 2134extern "C" void events(); 2135 2136// According to Windows API documentation, an illegal instruction sequence should generate 2137// the 0xC000001C exception code. However, real world experience shows that occasionnaly 2138// the execution of an illegal instruction can generate the exception code 0xC000001E. This 2139// seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems). 2140 2141#define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E 2142 2143// From "Execution Protection in the Windows Operating System" draft 0.35 2144// Once a system header becomes available, the "real" define should be 2145// included or copied here. 2146#define EXCEPTION_INFO_EXEC_VIOLATION 0x08 2147 2148// Handle NAT Bit consumption on IA64. 2149#ifdef _M_IA64 2150#define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION 2151#endif 2152 2153// Windows Vista/2008 heap corruption check 2154#define EXCEPTION_HEAP_CORRUPTION 0xC0000374 2155 2156#define def_excpt(val) #val, val 2157 2158struct siglabel { 2159 char *name; 2160 int number; 2161}; 2162 2163// All Visual C++ exceptions thrown from code generated by the Microsoft Visual 2164// C++ compiler contain this error code. Because this is a compiler-generated 2165// error, the code is not listed in the Win32 API header files. 2166// The code is actually a cryptic mnemonic device, with the initial "E" 2167// standing for "exception" and the final 3 bytes (0x6D7363) representing the 2168// ASCII values of "msc". 2169 2170#define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363 2171 2172 2173struct siglabel exceptlabels[] = { 2174 def_excpt(EXCEPTION_ACCESS_VIOLATION), 2175 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT), 2176 def_excpt(EXCEPTION_BREAKPOINT), 2177 def_excpt(EXCEPTION_SINGLE_STEP), 2178 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED), 2179 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND), 2180 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO), 2181 def_excpt(EXCEPTION_FLT_INEXACT_RESULT), 2182 def_excpt(EXCEPTION_FLT_INVALID_OPERATION), 2183 def_excpt(EXCEPTION_FLT_OVERFLOW), 2184 def_excpt(EXCEPTION_FLT_STACK_CHECK), 2185 def_excpt(EXCEPTION_FLT_UNDERFLOW), 2186 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO), 2187 def_excpt(EXCEPTION_INT_OVERFLOW), 2188 def_excpt(EXCEPTION_PRIV_INSTRUCTION), 2189 def_excpt(EXCEPTION_IN_PAGE_ERROR), 2190 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION), 2191 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2), 2192 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION), 2193 def_excpt(EXCEPTION_STACK_OVERFLOW), 2194 def_excpt(EXCEPTION_INVALID_DISPOSITION), 2195 def_excpt(EXCEPTION_GUARD_PAGE), 2196 def_excpt(EXCEPTION_INVALID_HANDLE), 2197 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION), 2198 def_excpt(EXCEPTION_HEAP_CORRUPTION), 2199#ifdef _M_IA64 2200 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION), 2201#endif 2202 NULL, 0 2203}; 2204 2205const char* os::exception_name(int exception_code, char *buf, size_t size) { 2206 for (int i = 0; exceptlabels[i].name != NULL; i++) { 2207 if (exceptlabels[i].number == exception_code) { 2208 jio_snprintf(buf, size, "%s", exceptlabels[i].name); 2209 return buf; 2210 } 2211 } 2212 2213 return NULL; 2214} 2215 2216//----------------------------------------------------------------------------- 2217LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2218 // handle exception caused by idiv; should only happen for -MinInt/-1 2219 // (division by zero is handled explicitly) 2220#ifdef _M_IA64 2221 assert(0, "Fix Handle_IDiv_Exception"); 2222#elif _M_AMD64 2223 PCONTEXT ctx = exceptionInfo->ContextRecord; 2224 address pc = (address)ctx->Rip; 2225 assert(pc[0] == 0xF7, "not an idiv opcode"); 2226 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2227 assert(ctx->Rax == min_jint, "unexpected idiv exception"); 2228 // set correct result values and continue after idiv instruction 2229 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2230 ctx->Rax = (DWORD)min_jint; // result 2231 ctx->Rdx = (DWORD)0; // remainder 2232 // Continue the execution 2233#else 2234 PCONTEXT ctx = exceptionInfo->ContextRecord; 2235 address pc = (address)ctx->Eip; 2236 assert(pc[0] == 0xF7, "not an idiv opcode"); 2237 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands"); 2238 assert(ctx->Eax == min_jint, "unexpected idiv exception"); 2239 // set correct result values and continue after idiv instruction 2240 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes 2241 ctx->Eax = (DWORD)min_jint; // result 2242 ctx->Edx = (DWORD)0; // remainder 2243 // Continue the execution 2244#endif 2245 return EXCEPTION_CONTINUE_EXECUTION; 2246} 2247 2248//----------------------------------------------------------------------------- 2249LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) { 2250 PCONTEXT ctx = exceptionInfo->ContextRecord; 2251#ifndef _WIN64 2252 // handle exception caused by native method modifying control word 2253 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2254 2255 switch (exception_code) { 2256 case EXCEPTION_FLT_DENORMAL_OPERAND: 2257 case EXCEPTION_FLT_DIVIDE_BY_ZERO: 2258 case EXCEPTION_FLT_INEXACT_RESULT: 2259 case EXCEPTION_FLT_INVALID_OPERATION: 2260 case EXCEPTION_FLT_OVERFLOW: 2261 case EXCEPTION_FLT_STACK_CHECK: 2262 case EXCEPTION_FLT_UNDERFLOW: 2263 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std()); 2264 if (fp_control_word != ctx->FloatSave.ControlWord) { 2265 // Restore FPCW and mask out FLT exceptions 2266 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0; 2267 // Mask out pending FLT exceptions 2268 ctx->FloatSave.StatusWord &= 0xffffff00; 2269 return EXCEPTION_CONTINUE_EXECUTION; 2270 } 2271 } 2272 2273 if (prev_uef_handler != NULL) { 2274 // We didn't handle this exception so pass it to the previous 2275 // UnhandledExceptionFilter. 2276 return (prev_uef_handler)(exceptionInfo); 2277 } 2278#else // !_WIN64 2279/* 2280 On Windows, the mxcsr control bits are non-volatile across calls 2281 See also CR 6192333 2282 */ 2283 jint MxCsr = INITIAL_MXCSR; 2284 // we can't use StubRoutines::addr_mxcsr_std() 2285 // because in Win64 mxcsr is not saved there 2286 if (MxCsr != ctx->MxCsr) { 2287 ctx->MxCsr = MxCsr; 2288 return EXCEPTION_CONTINUE_EXECUTION; 2289 } 2290#endif // !_WIN64 2291 2292 return EXCEPTION_CONTINUE_SEARCH; 2293} 2294 2295// Fatal error reporting is single threaded so we can make this a 2296// static and preallocated. If it's more than MAX_PATH silently ignore 2297// it. 2298static char saved_error_file[MAX_PATH] = {0}; 2299 2300void os::set_error_file(const char *logfile) { 2301 if (strlen(logfile) <= MAX_PATH) { 2302 strncpy(saved_error_file, logfile, MAX_PATH); 2303 } 2304} 2305 2306static inline void report_error(Thread* t, DWORD exception_code, 2307 address addr, void* siginfo, void* context) { 2308 VMError err(t, exception_code, addr, siginfo, context); 2309 err.report_and_die(); 2310 2311 // If UseOsErrorReporting, this will return here and save the error file 2312 // somewhere where we can find it in the minidump. 2313} 2314 2315//----------------------------------------------------------------------------- 2316LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2317 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH; 2318 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2319#ifdef _M_IA64 2320 // On Itanium, we need the "precise pc", which has the slot number coded 2321 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format). 2322 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress; 2323 // Convert the pc to "Unix format", which has the slot number coded 2324 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2 2325 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction" 2326 // information is saved in the Unix format. 2327 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2)); 2328#elif _M_AMD64 2329 address pc = (address) exceptionInfo->ContextRecord->Rip; 2330#else 2331 address pc = (address) exceptionInfo->ContextRecord->Eip; 2332#endif 2333 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady 2334 2335 // Handle SafeFetch32 and SafeFetchN exceptions. 2336 if (StubRoutines::is_safefetch_fault(pc)) { 2337 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc)); 2338 } 2339 2340#ifndef _WIN64 2341 // Execution protection violation - win32 running on AMD64 only 2342 // Handled first to avoid misdiagnosis as a "normal" access violation; 2343 // This is safe to do because we have a new/unique ExceptionInformation 2344 // code for this condition. 2345 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2346 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2347 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0]; 2348 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2349 2350 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) { 2351 int page_size = os::vm_page_size(); 2352 2353 // Make sure the pc and the faulting address are sane. 2354 // 2355 // If an instruction spans a page boundary, and the page containing 2356 // the beginning of the instruction is executable but the following 2357 // page is not, the pc and the faulting address might be slightly 2358 // different - we still want to unguard the 2nd page in this case. 2359 // 2360 // 15 bytes seems to be a (very) safe value for max instruction size. 2361 bool pc_is_near_addr = 2362 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); 2363 bool instr_spans_page_boundary = 2364 (align_size_down((intptr_t) pc ^ (intptr_t) addr, 2365 (intptr_t) page_size) > 0); 2366 2367 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { 2368 static volatile address last_addr = 2369 (address) os::non_memory_address_word(); 2370 2371 // In conservative mode, don't unguard unless the address is in the VM 2372 if (UnguardOnExecutionViolation > 0 && addr != last_addr && 2373 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { 2374 2375 // Set memory to RWX and retry 2376 address page_start = 2377 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); 2378 bool res = os::protect_memory((char*) page_start, page_size, 2379 os::MEM_PROT_RWX); 2380 2381 if (PrintMiscellaneous && Verbose) { 2382 char buf[256]; 2383 jio_snprintf(buf, sizeof(buf), "Execution protection violation " 2384 "at " INTPTR_FORMAT 2385 ", unguarding " INTPTR_FORMAT ": %s", addr, 2386 page_start, (res ? "success" : strerror(errno))); 2387 tty->print_raw_cr(buf); 2388 } 2389 2390 // Set last_addr so if we fault again at the same address, we don't 2391 // end up in an endless loop. 2392 // 2393 // There are two potential complications here. Two threads trapping 2394 // at the same address at the same time could cause one of the 2395 // threads to think it already unguarded, and abort the VM. Likely 2396 // very rare. 2397 // 2398 // The other race involves two threads alternately trapping at 2399 // different addresses and failing to unguard the page, resulting in 2400 // an endless loop. This condition is probably even more unlikely 2401 // than the first. 2402 // 2403 // Although both cases could be avoided by using locks or thread 2404 // local last_addr, these solutions are unnecessary complication: 2405 // this handler is a best-effort safety net, not a complete solution. 2406 // It is disabled by default and should only be used as a workaround 2407 // in case we missed any no-execute-unsafe VM code. 2408 2409 last_addr = addr; 2410 2411 return EXCEPTION_CONTINUE_EXECUTION; 2412 } 2413 } 2414 2415 // Last unguard failed or not unguarding 2416 tty->print_raw_cr("Execution protection violation"); 2417 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord, 2418 exceptionInfo->ContextRecord); 2419 return EXCEPTION_CONTINUE_SEARCH; 2420 } 2421 } 2422#endif // _WIN64 2423 2424 // Check to see if we caught the safepoint code in the 2425 // process of write protecting the memory serialization page. 2426 // It write enables the page immediately after protecting it 2427 // so just return. 2428 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2429 JavaThread* thread = (JavaThread*) t; 2430 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2431 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2432 if (os::is_memory_serialize_page(thread, addr)) { 2433 // Block current thread until the memory serialize page permission restored. 2434 os::block_on_serialize_page_trap(); 2435 return EXCEPTION_CONTINUE_EXECUTION; 2436 } 2437 } 2438 2439 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) && 2440 VM_Version::is_cpuinfo_segv_addr(pc)) { 2441 // Verify that OS save/restore AVX registers. 2442 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr()); 2443 } 2444 2445 if (t != NULL && t->is_Java_thread()) { 2446 JavaThread* thread = (JavaThread*) t; 2447 bool in_java = thread->thread_state() == _thread_in_Java; 2448 2449 // Handle potential stack overflows up front. 2450 if (exception_code == EXCEPTION_STACK_OVERFLOW) { 2451 if (os::uses_stack_guard_pages()) { 2452#ifdef _M_IA64 2453 // Use guard page for register stack. 2454 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2455 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2456 // Check for a register stack overflow on Itanium 2457 if (thread->addr_inside_register_stack_red_zone(addr)) { 2458 // Fatal red zone violation happens if the Java program 2459 // catches a StackOverflow error and does so much processing 2460 // that it runs beyond the unprotected yellow guard zone. As 2461 // a result, we are out of here. 2462 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit."); 2463 } else if(thread->addr_inside_register_stack(addr)) { 2464 // Disable the yellow zone which sets the state that 2465 // we've got a stack overflow problem. 2466 if (thread->stack_yellow_zone_enabled()) { 2467 thread->disable_stack_yellow_zone(); 2468 } 2469 // Give us some room to process the exception. 2470 thread->disable_register_stack_guard(); 2471 // Tracing with +Verbose. 2472 if (Verbose) { 2473 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc); 2474 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr); 2475 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base()); 2476 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]", 2477 thread->register_stack_base(), 2478 thread->register_stack_base() + thread->stack_size()); 2479 } 2480 2481 // Reguard the permanent register stack red zone just to be sure. 2482 // We saw Windows silently disabling this without telling us. 2483 thread->enable_register_stack_red_zone(); 2484 2485 return Handle_Exception(exceptionInfo, 2486 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2487 } 2488#endif 2489 if (thread->stack_yellow_zone_enabled()) { 2490 // Yellow zone violation. The o/s has unprotected the first yellow 2491 // zone page for us. Note: must call disable_stack_yellow_zone to 2492 // update the enabled status, even if the zone contains only one page. 2493 thread->disable_stack_yellow_zone(); 2494 // If not in java code, return and hope for the best. 2495 return in_java ? Handle_Exception(exceptionInfo, 2496 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)) 2497 : EXCEPTION_CONTINUE_EXECUTION; 2498 } else { 2499 // Fatal red zone violation. 2500 thread->disable_stack_red_zone(); 2501 tty->print_raw_cr("An unrecoverable stack overflow has occurred."); 2502 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2503 exceptionInfo->ContextRecord); 2504 return EXCEPTION_CONTINUE_SEARCH; 2505 } 2506 } else if (in_java) { 2507 // JVM-managed guard pages cannot be used on win95/98. The o/s provides 2508 // a one-time-only guard page, which it has released to us. The next 2509 // stack overflow on this thread will result in an ACCESS_VIOLATION. 2510 return Handle_Exception(exceptionInfo, 2511 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2512 } else { 2513 // Can only return and hope for the best. Further stack growth will 2514 // result in an ACCESS_VIOLATION. 2515 return EXCEPTION_CONTINUE_EXECUTION; 2516 } 2517 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2518 // Either stack overflow or null pointer exception. 2519 if (in_java) { 2520 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2521 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2522 address stack_end = thread->stack_base() - thread->stack_size(); 2523 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) { 2524 // Stack overflow. 2525 assert(!os::uses_stack_guard_pages(), 2526 "should be caught by red zone code above."); 2527 return Handle_Exception(exceptionInfo, 2528 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW)); 2529 } 2530 // 2531 // Check for safepoint polling and implicit null 2532 // We only expect null pointers in the stubs (vtable) 2533 // the rest are checked explicitly now. 2534 // 2535 CodeBlob* cb = CodeCache::find_blob(pc); 2536 if (cb != NULL) { 2537 if (os::is_poll_address(addr)) { 2538 address stub = SharedRuntime::get_poll_stub(pc); 2539 return Handle_Exception(exceptionInfo, stub); 2540 } 2541 } 2542 { 2543#ifdef _WIN64 2544 // 2545 // If it's a legal stack address map the entire region in 2546 // 2547 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord; 2548 address addr = (address) exceptionRecord->ExceptionInformation[1]; 2549 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) { 2550 addr = (address)((uintptr_t)addr & 2551 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1))); 2552 os::commit_memory((char *)addr, thread->stack_base() - addr, 2553 !ExecMem); 2554 return EXCEPTION_CONTINUE_EXECUTION; 2555 } 2556 else 2557#endif 2558 { 2559 // Null pointer exception. 2560#ifdef _M_IA64 2561 // Process implicit null checks in compiled code. Note: Implicit null checks 2562 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs. 2563 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) { 2564 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format); 2565 // Handle implicit null check in UEP method entry 2566 if (cb && (cb->is_frame_complete_at(pc) || 2567 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) { 2568 if (Verbose) { 2569 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0); 2570 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format); 2571 tty->print_cr(" to addr " INTPTR_FORMAT, addr); 2572 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)", 2573 *(bundle_start + 1), *bundle_start); 2574 } 2575 return Handle_Exception(exceptionInfo, 2576 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL)); 2577 } 2578 } 2579 2580 // Implicit null checks were processed above. Hence, we should not reach 2581 // here in the usual case => die! 2582 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception"); 2583 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2584 exceptionInfo->ContextRecord); 2585 return EXCEPTION_CONTINUE_SEARCH; 2586 2587#else // !IA64 2588 2589 // Windows 98 reports faulting addresses incorrectly 2590 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) || 2591 !os::win32::is_nt()) { 2592 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); 2593 if (stub != NULL) return Handle_Exception(exceptionInfo, stub); 2594 } 2595 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2596 exceptionInfo->ContextRecord); 2597 return EXCEPTION_CONTINUE_SEARCH; 2598#endif 2599 } 2600 } 2601 } 2602 2603#ifdef _WIN64 2604 // Special care for fast JNI field accessors. 2605 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks 2606 // in and the heap gets shrunk before the field access. 2607 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2608 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2609 if (addr != (address)-1) { 2610 return Handle_Exception(exceptionInfo, addr); 2611 } 2612 } 2613#endif 2614 2615 // Stack overflow or null pointer exception in native code. 2616 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2617 exceptionInfo->ContextRecord); 2618 return EXCEPTION_CONTINUE_SEARCH; 2619 } // /EXCEPTION_ACCESS_VIOLATION 2620 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2621#if defined _M_IA64 2622 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION || 2623 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) { 2624 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0); 2625 2626 // Compiled method patched to be non entrant? Following conditions must apply: 2627 // 1. must be first instruction in bundle 2628 // 2. must be a break instruction with appropriate code 2629 if ((((uint64_t) pc & 0x0F) == 0) && 2630 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) { 2631 return Handle_Exception(exceptionInfo, 2632 (address)SharedRuntime::get_handle_wrong_method_stub()); 2633 } 2634 } // /EXCEPTION_ILLEGAL_INSTRUCTION 2635#endif 2636 2637 2638 if (in_java) { 2639 switch (exception_code) { 2640 case EXCEPTION_INT_DIVIDE_BY_ZERO: 2641 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO)); 2642 2643 case EXCEPTION_INT_OVERFLOW: 2644 return Handle_IDiv_Exception(exceptionInfo); 2645 2646 } // switch 2647 } 2648 if (((thread->thread_state() == _thread_in_Java) || 2649 (thread->thread_state() == _thread_in_native)) && 2650 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) 2651 { 2652 LONG result=Handle_FLT_Exception(exceptionInfo); 2653 if (result==EXCEPTION_CONTINUE_EXECUTION) return result; 2654 } 2655 } 2656 2657 if (exception_code != EXCEPTION_BREAKPOINT) { 2658 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord, 2659 exceptionInfo->ContextRecord); 2660 } 2661 return EXCEPTION_CONTINUE_SEARCH; 2662} 2663 2664#ifndef _WIN64 2665// Special care for fast JNI accessors. 2666// jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and 2667// the heap gets shrunk before the field access. 2668// Need to install our own structured exception handler since native code may 2669// install its own. 2670LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) { 2671 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode; 2672 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 2673 address pc = (address) exceptionInfo->ContextRecord->Eip; 2674 address addr = JNI_FastGetField::find_slowcase_pc(pc); 2675 if (addr != (address)-1) { 2676 return Handle_Exception(exceptionInfo, addr); 2677 } 2678 } 2679 return EXCEPTION_CONTINUE_SEARCH; 2680} 2681 2682#define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \ 2683Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \ 2684 __try { \ 2685 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \ 2686 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \ 2687 } \ 2688 return 0; \ 2689} 2690 2691DEFINE_FAST_GETFIELD(jboolean, bool, Boolean) 2692DEFINE_FAST_GETFIELD(jbyte, byte, Byte) 2693DEFINE_FAST_GETFIELD(jchar, char, Char) 2694DEFINE_FAST_GETFIELD(jshort, short, Short) 2695DEFINE_FAST_GETFIELD(jint, int, Int) 2696DEFINE_FAST_GETFIELD(jlong, long, Long) 2697DEFINE_FAST_GETFIELD(jfloat, float, Float) 2698DEFINE_FAST_GETFIELD(jdouble, double, Double) 2699 2700address os::win32::fast_jni_accessor_wrapper(BasicType type) { 2701 switch (type) { 2702 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper; 2703 case T_BYTE: return (address)jni_fast_GetByteField_wrapper; 2704 case T_CHAR: return (address)jni_fast_GetCharField_wrapper; 2705 case T_SHORT: return (address)jni_fast_GetShortField_wrapper; 2706 case T_INT: return (address)jni_fast_GetIntField_wrapper; 2707 case T_LONG: return (address)jni_fast_GetLongField_wrapper; 2708 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper; 2709 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper; 2710 default: ShouldNotReachHere(); 2711 } 2712 return (address)-1; 2713} 2714#endif 2715 2716void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) { 2717 // Install a win32 structured exception handler around the test 2718 // function call so the VM can generate an error dump if needed. 2719 __try { 2720 (*funcPtr)(); 2721 } __except(topLevelExceptionFilter( 2722 (_EXCEPTION_POINTERS*)_exception_info())) { 2723 // Nothing to do. 2724 } 2725} 2726 2727// Virtual Memory 2728 2729int os::vm_page_size() { return os::win32::vm_page_size(); } 2730int os::vm_allocation_granularity() { 2731 return os::win32::vm_allocation_granularity(); 2732} 2733 2734// Windows large page support is available on Windows 2003. In order to use 2735// large page memory, the administrator must first assign additional privilege 2736// to the user: 2737// + select Control Panel -> Administrative Tools -> Local Security Policy 2738// + select Local Policies -> User Rights Assignment 2739// + double click "Lock pages in memory", add users and/or groups 2740// + reboot 2741// Note the above steps are needed for administrator as well, as administrators 2742// by default do not have the privilege to lock pages in memory. 2743// 2744// Note about Windows 2003: although the API supports committing large page 2745// memory on a page-by-page basis and VirtualAlloc() returns success under this 2746// scenario, I found through experiment it only uses large page if the entire 2747// memory region is reserved and committed in a single VirtualAlloc() call. 2748// This makes Windows large page support more or less like Solaris ISM, in 2749// that the entire heap must be committed upfront. This probably will change 2750// in the future, if so the code below needs to be revisited. 2751 2752#ifndef MEM_LARGE_PAGES 2753#define MEM_LARGE_PAGES 0x20000000 2754#endif 2755 2756static HANDLE _hProcess; 2757static HANDLE _hToken; 2758 2759// Container for NUMA node list info 2760class NUMANodeListHolder { 2761private: 2762 int *_numa_used_node_list; // allocated below 2763 int _numa_used_node_count; 2764 2765 void free_node_list() { 2766 if (_numa_used_node_list != NULL) { 2767 FREE_C_HEAP_ARRAY(int, _numa_used_node_list, mtInternal); 2768 } 2769 } 2770 2771public: 2772 NUMANodeListHolder() { 2773 _numa_used_node_count = 0; 2774 _numa_used_node_list = NULL; 2775 // do rest of initialization in build routine (after function pointers are set up) 2776 } 2777 2778 ~NUMANodeListHolder() { 2779 free_node_list(); 2780 } 2781 2782 bool build() { 2783 DWORD_PTR proc_aff_mask; 2784 DWORD_PTR sys_aff_mask; 2785 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false; 2786 ULONG highest_node_number; 2787 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false; 2788 free_node_list(); 2789 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal); 2790 for (unsigned int i = 0; i <= highest_node_number; i++) { 2791 ULONGLONG proc_mask_numa_node; 2792 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false; 2793 if ((proc_aff_mask & proc_mask_numa_node)!=0) { 2794 _numa_used_node_list[_numa_used_node_count++] = i; 2795 } 2796 } 2797 return (_numa_used_node_count > 1); 2798 } 2799 2800 int get_count() { return _numa_used_node_count; } 2801 int get_node_list_entry(int n) { 2802 // for indexes out of range, returns -1 2803 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1); 2804 } 2805 2806} numa_node_list_holder; 2807 2808 2809 2810static size_t _large_page_size = 0; 2811 2812static bool resolve_functions_for_large_page_init() { 2813 return os::Kernel32Dll::GetLargePageMinimumAvailable() && 2814 os::Advapi32Dll::AdvapiAvailable(); 2815} 2816 2817static bool request_lock_memory_privilege() { 2818 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, 2819 os::current_process_id()); 2820 2821 LUID luid; 2822 if (_hProcess != NULL && 2823 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) && 2824 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) { 2825 2826 TOKEN_PRIVILEGES tp; 2827 tp.PrivilegeCount = 1; 2828 tp.Privileges[0].Luid = luid; 2829 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 2830 2831 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the 2832 // privilege. Check GetLastError() too. See MSDN document. 2833 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) && 2834 (GetLastError() == ERROR_SUCCESS)) { 2835 return true; 2836 } 2837 } 2838 2839 return false; 2840} 2841 2842static void cleanup_after_large_page_init() { 2843 if (_hProcess) CloseHandle(_hProcess); 2844 _hProcess = NULL; 2845 if (_hToken) CloseHandle(_hToken); 2846 _hToken = NULL; 2847} 2848 2849static bool numa_interleaving_init() { 2850 bool success = false; 2851 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving); 2852 2853 // print a warning if UseNUMAInterleaving flag is specified on command line 2854 bool warn_on_failure = use_numa_interleaving_specified; 2855# define WARN(msg) if (warn_on_failure) { warning(msg); } 2856 2857 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages) 2858 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2859 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity); 2860 2861 if (os::Kernel32Dll::NumaCallsAvailable()) { 2862 if (numa_node_list_holder.build()) { 2863 if (PrintMiscellaneous && Verbose) { 2864 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count()); 2865 for (int i = 0; i < numa_node_list_holder.get_count(); i++) { 2866 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i)); 2867 } 2868 tty->print("\n"); 2869 } 2870 success = true; 2871 } else { 2872 WARN("Process does not cover multiple NUMA nodes."); 2873 } 2874 } else { 2875 WARN("NUMA Interleaving is not supported by the operating system."); 2876 } 2877 if (!success) { 2878 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag."); 2879 } 2880 return success; 2881#undef WARN 2882} 2883 2884// this routine is used whenever we need to reserve a contiguous VA range 2885// but we need to make separate VirtualAlloc calls for each piece of the range 2886// Reasons for doing this: 2887// * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise) 2888// * UseNUMAInterleaving requires a separate node for each piece 2889static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, DWORD prot, 2890 bool should_inject_error=false) { 2891 char * p_buf; 2892 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size 2893 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity(); 2894 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size; 2895 2896 // first reserve enough address space in advance since we want to be 2897 // able to break a single contiguous virtual address range into multiple 2898 // large page commits but WS2003 does not allow reserving large page space 2899 // so we just use 4K pages for reserve, this gives us a legal contiguous 2900 // address space. then we will deallocate that reservation, and re alloc 2901 // using large pages 2902 const size_t size_of_reserve = bytes + chunk_size; 2903 if (bytes > size_of_reserve) { 2904 // Overflowed. 2905 return NULL; 2906 } 2907 p_buf = (char *) VirtualAlloc(addr, 2908 size_of_reserve, // size of Reserve 2909 MEM_RESERVE, 2910 PAGE_READWRITE); 2911 // If reservation failed, return NULL 2912 if (p_buf == NULL) return NULL; 2913 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, mtNone, CALLER_PC); 2914 os::release_memory(p_buf, bytes + chunk_size); 2915 2916 // we still need to round up to a page boundary (in case we are using large pages) 2917 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size) 2918 // instead we handle this in the bytes_to_rq computation below 2919 p_buf = (char *) align_size_up((size_t)p_buf, page_size); 2920 2921 // now go through and allocate one chunk at a time until all bytes are 2922 // allocated 2923 size_t bytes_remaining = bytes; 2924 // An overflow of align_size_up() would have been caught above 2925 // in the calculation of size_of_reserve. 2926 char * next_alloc_addr = p_buf; 2927 HANDLE hProc = GetCurrentProcess(); 2928 2929#ifdef ASSERT 2930 // Variable for the failure injection 2931 long ran_num = os::random(); 2932 size_t fail_after = ran_num % bytes; 2933#endif 2934 2935 int count=0; 2936 while (bytes_remaining) { 2937 // select bytes_to_rq to get to the next chunk_size boundary 2938 2939 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size)); 2940 // Note allocate and commit 2941 char * p_new; 2942 2943#ifdef ASSERT 2944 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after); 2945#else 2946 const bool inject_error_now = false; 2947#endif 2948 2949 if (inject_error_now) { 2950 p_new = NULL; 2951 } else { 2952 if (!UseNUMAInterleaving) { 2953 p_new = (char *) VirtualAlloc(next_alloc_addr, 2954 bytes_to_rq, 2955 flags, 2956 prot); 2957 } else { 2958 // get the next node to use from the used_node_list 2959 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected"); 2960 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count()); 2961 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc, 2962 next_alloc_addr, 2963 bytes_to_rq, 2964 flags, 2965 prot, 2966 node); 2967 } 2968 } 2969 2970 if (p_new == NULL) { 2971 // Free any allocated pages 2972 if (next_alloc_addr > p_buf) { 2973 // Some memory was committed so release it. 2974 size_t bytes_to_release = bytes - bytes_remaining; 2975 // NMT has yet to record any individual blocks, so it 2976 // need to create a dummy 'reserve' record to match 2977 // the release. 2978 MemTracker::record_virtual_memory_reserve((address)p_buf, 2979 bytes_to_release, mtNone, CALLER_PC); 2980 os::release_memory(p_buf, bytes_to_release); 2981 } 2982#ifdef ASSERT 2983 if (should_inject_error) { 2984 if (TracePageSizes && Verbose) { 2985 tty->print_cr("Reserving pages individually failed."); 2986 } 2987 } 2988#endif 2989 return NULL; 2990 } 2991 2992 bytes_remaining -= bytes_to_rq; 2993 next_alloc_addr += bytes_to_rq; 2994 count++; 2995 } 2996 // Although the memory is allocated individually, it is returned as one. 2997 // NMT records it as one block. 2998 address pc = CALLER_PC; 2999 if ((flags & MEM_COMMIT) != 0) { 3000 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, mtNone, pc); 3001 } else { 3002 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, mtNone, pc); 3003 } 3004 3005 // made it this far, success 3006 return p_buf; 3007} 3008 3009 3010 3011void os::large_page_init() { 3012 if (!UseLargePages) return; 3013 3014 // print a warning if any large page related flag is specified on command line 3015 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 3016 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 3017 bool success = false; 3018 3019# define WARN(msg) if (warn_on_failure) { warning(msg); } 3020 if (resolve_functions_for_large_page_init()) { 3021 if (request_lock_memory_privilege()) { 3022 size_t s = os::Kernel32Dll::GetLargePageMinimum(); 3023 if (s) { 3024#if defined(IA32) || defined(AMD64) 3025 if (s > 4*M || LargePageSizeInBytes > 4*M) { 3026 WARN("JVM cannot use large pages bigger than 4mb."); 3027 } else { 3028#endif 3029 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) { 3030 _large_page_size = LargePageSizeInBytes; 3031 } else { 3032 _large_page_size = s; 3033 } 3034 success = true; 3035#if defined(IA32) || defined(AMD64) 3036 } 3037#endif 3038 } else { 3039 WARN("Large page is not supported by the processor."); 3040 } 3041 } else { 3042 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory."); 3043 } 3044 } else { 3045 WARN("Large page is not supported by the operating system."); 3046 } 3047#undef WARN 3048 3049 const size_t default_page_size = (size_t) vm_page_size(); 3050 if (success && _large_page_size > default_page_size) { 3051 _page_sizes[0] = _large_page_size; 3052 _page_sizes[1] = default_page_size; 3053 _page_sizes[2] = 0; 3054 } 3055 3056 cleanup_after_large_page_init(); 3057 UseLargePages = success; 3058} 3059 3060// On win32, one cannot release just a part of reserved memory, it's an 3061// all or nothing deal. When we split a reservation, we must break the 3062// reservation into two reservations. 3063void os::pd_split_reserved_memory(char *base, size_t size, size_t split, 3064 bool realloc) { 3065 if (size > 0) { 3066 release_memory(base, size); 3067 if (realloc) { 3068 reserve_memory(split, base); 3069 } 3070 if (size != split) { 3071 reserve_memory(size - split, base + split); 3072 } 3073 } 3074} 3075 3076// Multiple threads can race in this code but it's not possible to unmap small sections of 3077// virtual space to get requested alignment, like posix-like os's. 3078// Windows prevents multiple thread from remapping over each other so this loop is thread-safe. 3079char* os::reserve_memory_aligned(size_t size, size_t alignment) { 3080 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, 3081 "Alignment must be a multiple of allocation granularity (page size)"); 3082 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); 3083 3084 size_t extra_size = size + alignment; 3085 assert(extra_size >= size, "overflow, size is too large to allow alignment"); 3086 3087 char* aligned_base = NULL; 3088 3089 do { 3090 char* extra_base = os::reserve_memory(extra_size, NULL, alignment); 3091 if (extra_base == NULL) { 3092 return NULL; 3093 } 3094 // Do manual alignment 3095 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); 3096 3097 os::release_memory(extra_base, extra_size); 3098 3099 aligned_base = os::reserve_memory(size, aligned_base); 3100 3101 } while (aligned_base == NULL); 3102 3103 return aligned_base; 3104} 3105 3106char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { 3107 assert((size_t)addr % os::vm_allocation_granularity() == 0, 3108 "reserve alignment"); 3109 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size"); 3110 char* res; 3111 // note that if UseLargePages is on, all the areas that require interleaving 3112 // will go thru reserve_memory_special rather than thru here. 3113 bool use_individual = (UseNUMAInterleaving && !UseLargePages); 3114 if (!use_individual) { 3115 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE); 3116 } else { 3117 elapsedTimer reserveTimer; 3118 if (Verbose && PrintMiscellaneous) reserveTimer.start(); 3119 // in numa interleaving, we have to allocate pages individually 3120 // (well really chunks of NUMAInterleaveGranularity size) 3121 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE); 3122 if (res == NULL) { 3123 warning("NUMA page allocation failed"); 3124 } 3125 if (Verbose && PrintMiscellaneous) { 3126 reserveTimer.stop(); 3127 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes, 3128 reserveTimer.milliseconds(), reserveTimer.ticks()); 3129 } 3130 } 3131 assert(res == NULL || addr == NULL || addr == res, 3132 "Unexpected address from reserve."); 3133 3134 return res; 3135} 3136 3137// Reserve memory at an arbitrary address, only if that area is 3138// available (and not reserved for something else). 3139char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3140 // Windows os::reserve_memory() fails of the requested address range is 3141 // not avilable. 3142 return reserve_memory(bytes, requested_addr); 3143} 3144 3145size_t os::large_page_size() { 3146 return _large_page_size; 3147} 3148 3149bool os::can_commit_large_page_memory() { 3150 // Windows only uses large page memory when the entire region is reserved 3151 // and committed in a single VirtualAlloc() call. This may change in the 3152 // future, but with Windows 2003 it's not possible to commit on demand. 3153 return false; 3154} 3155 3156bool os::can_execute_large_page_memory() { 3157 return true; 3158} 3159 3160char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, bool exec) { 3161 assert(UseLargePages, "only for large pages"); 3162 3163 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { 3164 return NULL; // Fallback to small pages. 3165 } 3166 3167 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE; 3168 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3169 3170 // with large pages, there are two cases where we need to use Individual Allocation 3171 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003) 3172 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page 3173 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) { 3174 if (TracePageSizes && Verbose) { 3175 tty->print_cr("Reserving large pages individually."); 3176 } 3177 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError); 3178 if (p_buf == NULL) { 3179 // give an appropriate warning message 3180 if (UseNUMAInterleaving) { 3181 warning("NUMA large page allocation failed, UseLargePages flag ignored"); 3182 } 3183 if (UseLargePagesIndividualAllocation) { 3184 warning("Individually allocated large pages failed, " 3185 "use -XX:-UseLargePagesIndividualAllocation to turn off"); 3186 } 3187 return NULL; 3188 } 3189 3190 return p_buf; 3191 3192 } else { 3193 if (TracePageSizes && Verbose) { 3194 tty->print_cr("Reserving large pages in a single large chunk."); 3195 } 3196 // normal policy just allocate it all at once 3197 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; 3198 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); 3199 if (res != NULL) { 3200 address pc = CALLER_PC; 3201 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, mtNone, pc); 3202 } 3203 3204 return res; 3205 } 3206} 3207 3208bool os::release_memory_special(char* base, size_t bytes) { 3209 assert(base != NULL, "Sanity check"); 3210 return release_memory(base, bytes); 3211} 3212 3213void os::print_statistics() { 3214} 3215 3216static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) { 3217 int err = os::get_last_error(); 3218 char buf[256]; 3219 size_t buf_len = os::lasterror(buf, sizeof(buf)); 3220 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 3221 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes, 3222 exec, buf_len != 0 ? buf : "<no_error_string>", err); 3223} 3224 3225bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 3226 if (bytes == 0) { 3227 // Don't bother the OS with noops. 3228 return true; 3229 } 3230 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries"); 3231 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks"); 3232 // Don't attempt to print anything if the OS call fails. We're 3233 // probably low on resources, so the print itself may cause crashes. 3234 3235 // unless we have NUMAInterleaving enabled, the range of a commit 3236 // is always within a reserve covered by a single VirtualAlloc 3237 // in that case we can just do a single commit for the requested size 3238 if (!UseNUMAInterleaving) { 3239 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) { 3240 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3241 return false; 3242 } 3243 if (exec) { 3244 DWORD oldprot; 3245 // Windows doc says to use VirtualProtect to get execute permissions 3246 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) { 3247 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);) 3248 return false; 3249 } 3250 } 3251 return true; 3252 } else { 3253 3254 // when NUMAInterleaving is enabled, the commit might cover a range that 3255 // came from multiple VirtualAlloc reserves (using allocate_pages_individually). 3256 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery 3257 // returns represents the number of bytes that can be committed in one step. 3258 size_t bytes_remaining = bytes; 3259 char * next_alloc_addr = addr; 3260 while (bytes_remaining > 0) { 3261 MEMORY_BASIC_INFORMATION alloc_info; 3262 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info)); 3263 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize); 3264 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, 3265 PAGE_READWRITE) == NULL) { 3266 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3267 exec);) 3268 return false; 3269 } 3270 if (exec) { 3271 DWORD oldprot; 3272 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, 3273 PAGE_EXECUTE_READWRITE, &oldprot)) { 3274 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq, 3275 exec);) 3276 return false; 3277 } 3278 } 3279 bytes_remaining -= bytes_to_rq; 3280 next_alloc_addr += bytes_to_rq; 3281 } 3282 } 3283 // if we made it this far, return true 3284 return true; 3285} 3286 3287bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 3288 bool exec) { 3289 // alignment_hint is ignored on this OS 3290 return pd_commit_memory(addr, size, exec); 3291} 3292 3293void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 3294 const char* mesg) { 3295 assert(mesg != NULL, "mesg must be specified"); 3296 if (!pd_commit_memory(addr, size, exec)) { 3297 warn_fail_commit_memory(addr, size, exec); 3298 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); 3299 } 3300} 3301 3302void os::pd_commit_memory_or_exit(char* addr, size_t size, 3303 size_t alignment_hint, bool exec, 3304 const char* mesg) { 3305 // alignment_hint is ignored on this OS 3306 pd_commit_memory_or_exit(addr, size, exec, mesg); 3307} 3308 3309bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3310 if (bytes == 0) { 3311 // Don't bother the OS with noops. 3312 return true; 3313 } 3314 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries"); 3315 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks"); 3316 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0); 3317} 3318 3319bool os::pd_release_memory(char* addr, size_t bytes) { 3320 return VirtualFree(addr, 0, MEM_RELEASE) != 0; 3321} 3322 3323bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 3324 return os::commit_memory(addr, size, !ExecMem); 3325} 3326 3327bool os::remove_stack_guard_pages(char* addr, size_t size) { 3328 return os::uncommit_memory(addr, size); 3329} 3330 3331// Set protections specified 3332bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3333 bool is_committed) { 3334 unsigned int p = 0; 3335 switch (prot) { 3336 case MEM_PROT_NONE: p = PAGE_NOACCESS; break; 3337 case MEM_PROT_READ: p = PAGE_READONLY; break; 3338 case MEM_PROT_RW: p = PAGE_READWRITE; break; 3339 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break; 3340 default: 3341 ShouldNotReachHere(); 3342 } 3343 3344 DWORD old_status; 3345 3346 // Strange enough, but on Win32 one can change protection only for committed 3347 // memory, not a big deal anyway, as bytes less or equal than 64K 3348 if (!is_committed) { 3349 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX, 3350 "cannot commit protection page"); 3351 } 3352 // One cannot use os::guard_memory() here, as on Win32 guard page 3353 // have different (one-shot) semantics, from MSDN on PAGE_GUARD: 3354 // 3355 // Pages in the region become guard pages. Any attempt to access a guard page 3356 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off 3357 // the guard page status. Guard pages thus act as a one-time access alarm. 3358 return VirtualProtect(addr, bytes, p, &old_status) != 0; 3359} 3360 3361bool os::guard_memory(char* addr, size_t bytes) { 3362 DWORD old_status; 3363 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0; 3364} 3365 3366bool os::unguard_memory(char* addr, size_t bytes) { 3367 DWORD old_status; 3368 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0; 3369} 3370 3371void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3372void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { } 3373void os::numa_make_global(char *addr, size_t bytes) { } 3374void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { } 3375bool os::numa_topology_changed() { return false; } 3376size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); } 3377int os::numa_get_group_id() { return 0; } 3378size_t os::numa_get_leaf_groups(int *ids, size_t size) { 3379 if (numa_node_list_holder.get_count() == 0 && size > 0) { 3380 // Provide an answer for UMA systems 3381 ids[0] = 0; 3382 return 1; 3383 } else { 3384 // check for size bigger than actual groups_num 3385 size = MIN2(size, numa_get_groups_num()); 3386 for (int i = 0; i < (int)size; i++) { 3387 ids[i] = numa_node_list_holder.get_node_list_entry(i); 3388 } 3389 return size; 3390 } 3391} 3392 3393bool os::get_page_info(char *start, page_info* info) { 3394 return false; 3395} 3396 3397char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 3398 return end; 3399} 3400 3401char* os::non_memory_address_word() { 3402 // Must never look like an address returned by reserve_memory, 3403 // even in its subfields (as defined by the CPU immediate fields, 3404 // if the CPU splits constants across multiple instructions). 3405 return (char*)-1; 3406} 3407 3408#define MAX_ERROR_COUNT 100 3409#define SYS_THREAD_ERROR 0xffffffffUL 3410 3411void os::pd_start_thread(Thread* thread) { 3412 DWORD ret = ResumeThread(thread->osthread()->thread_handle()); 3413 // Returns previous suspend state: 3414 // 0: Thread was not suspended 3415 // 1: Thread is running now 3416 // >1: Thread is still suspended. 3417 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back 3418} 3419 3420class HighResolutionInterval : public CHeapObj<mtThread> { 3421 // The default timer resolution seems to be 10 milliseconds. 3422 // (Where is this written down?) 3423 // If someone wants to sleep for only a fraction of the default, 3424 // then we set the timer resolution down to 1 millisecond for 3425 // the duration of their interval. 3426 // We carefully set the resolution back, since otherwise we 3427 // seem to incur an overhead (3%?) that we don't need. 3428 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time. 3429 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod(). 3430 // Alternatively, we could compute the relative error (503/500 = .6%) and only use 3431 // timeBeginPeriod() if the relative error exceeded some threshold. 3432 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and 3433 // to decreased efficiency related to increased timer "tick" rates. We want to minimize 3434 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high 3435 // resolution timers running. 3436private: 3437 jlong resolution; 3438public: 3439 HighResolutionInterval(jlong ms) { 3440 resolution = ms % 10L; 3441 if (resolution != 0) { 3442 MMRESULT result = timeBeginPeriod(1L); 3443 } 3444 } 3445 ~HighResolutionInterval() { 3446 if (resolution != 0) { 3447 MMRESULT result = timeEndPeriod(1L); 3448 } 3449 resolution = 0L; 3450 } 3451}; 3452 3453int os::sleep(Thread* thread, jlong ms, bool interruptable) { 3454 jlong limit = (jlong) MAXDWORD; 3455 3456 while (ms > limit) { 3457 int res; 3458 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) 3459 return res; 3460 ms -= limit; 3461 } 3462 3463 assert(thread == Thread::current(), "thread consistency check"); 3464 OSThread* osthread = thread->osthread(); 3465 OSThreadWaitState osts(osthread, false /* not Object.wait() */); 3466 int result; 3467 if (interruptable) { 3468 assert(thread->is_Java_thread(), "must be java thread"); 3469 JavaThread *jt = (JavaThread *) thread; 3470 ThreadBlockInVM tbivm(jt); 3471 3472 jt->set_suspend_equivalent(); 3473 // cleared by handle_special_suspend_equivalent_condition() or 3474 // java_suspend_self() via check_and_wait_while_suspended() 3475 3476 HANDLE events[1]; 3477 events[0] = osthread->interrupt_event(); 3478 HighResolutionInterval *phri=NULL; 3479 if (!ForceTimeHighResolution) 3480 phri = new HighResolutionInterval(ms); 3481 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) { 3482 result = OS_TIMEOUT; 3483 } else { 3484 ResetEvent(osthread->interrupt_event()); 3485 osthread->set_interrupted(false); 3486 result = OS_INTRPT; 3487 } 3488 delete phri; //if it is NULL, harmless 3489 3490 // were we externally suspended while we were waiting? 3491 jt->check_and_wait_while_suspended(); 3492 } else { 3493 assert(!thread->is_Java_thread(), "must not be java thread"); 3494 Sleep((long) ms); 3495 result = OS_TIMEOUT; 3496 } 3497 return result; 3498} 3499 3500// 3501// Short sleep, direct OS call. 3502// 3503// ms = 0, means allow others (if any) to run. 3504// 3505void os::naked_short_sleep(jlong ms) { 3506 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3507 Sleep(ms); 3508} 3509 3510// Sleep forever; naked call to OS-specific sleep; use with CAUTION 3511void os::infinite_sleep() { 3512 while (true) { // sleep forever ... 3513 Sleep(100000); // ... 100 seconds at a time 3514 } 3515} 3516 3517typedef BOOL (WINAPI * STTSignature)(void); 3518 3519void os::naked_yield() { 3520 // Use either SwitchToThread() or Sleep(0) 3521 // Consider passing back the return value from SwitchToThread(). 3522 if (os::Kernel32Dll::SwitchToThreadAvailable()) { 3523 SwitchToThread(); 3524 } else { 3525 Sleep(0); 3526 } 3527} 3528 3529// Win32 only gives you access to seven real priorities at a time, 3530// so we compress Java's ten down to seven. It would be better 3531// if we dynamically adjusted relative priorities. 3532 3533int os::java_to_os_priority[CriticalPriority + 1] = { 3534 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3535 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3536 THREAD_PRIORITY_LOWEST, // 2 3537 THREAD_PRIORITY_BELOW_NORMAL, // 3 3538 THREAD_PRIORITY_BELOW_NORMAL, // 4 3539 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3540 THREAD_PRIORITY_NORMAL, // 6 3541 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3542 THREAD_PRIORITY_ABOVE_NORMAL, // 8 3543 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3544 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority 3545 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority 3546}; 3547 3548int prio_policy1[CriticalPriority + 1] = { 3549 THREAD_PRIORITY_IDLE, // 0 Entry should never be used 3550 THREAD_PRIORITY_LOWEST, // 1 MinPriority 3551 THREAD_PRIORITY_LOWEST, // 2 3552 THREAD_PRIORITY_BELOW_NORMAL, // 3 3553 THREAD_PRIORITY_BELOW_NORMAL, // 4 3554 THREAD_PRIORITY_NORMAL, // 5 NormPriority 3555 THREAD_PRIORITY_ABOVE_NORMAL, // 6 3556 THREAD_PRIORITY_ABOVE_NORMAL, // 7 3557 THREAD_PRIORITY_HIGHEST, // 8 3558 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority 3559 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority 3560 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority 3561}; 3562 3563static int prio_init() { 3564 // If ThreadPriorityPolicy is 1, switch tables 3565 if (ThreadPriorityPolicy == 1) { 3566 int i; 3567 for (i = 0; i < CriticalPriority + 1; i++) { 3568 os::java_to_os_priority[i] = prio_policy1[i]; 3569 } 3570 } 3571 if (UseCriticalJavaThreadPriority) { 3572 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 3573 } 3574 return 0; 3575} 3576 3577OSReturn os::set_native_priority(Thread* thread, int priority) { 3578 if (!UseThreadPriorities) return OS_OK; 3579 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0; 3580 return ret ? OS_OK : OS_ERR; 3581} 3582 3583OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) { 3584 if (!UseThreadPriorities) { 3585 *priority_ptr = java_to_os_priority[NormPriority]; 3586 return OS_OK; 3587 } 3588 int os_prio = GetThreadPriority(thread->osthread()->thread_handle()); 3589 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) { 3590 assert(false, "GetThreadPriority failed"); 3591 return OS_ERR; 3592 } 3593 *priority_ptr = os_prio; 3594 return OS_OK; 3595} 3596 3597 3598// Hint to the underlying OS that a task switch would not be good. 3599// Void return because it's a hint and can fail. 3600void os::hint_no_preempt() {} 3601 3602void os::interrupt(Thread* thread) { 3603 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3604 "possibility of dangling Thread pointer"); 3605 3606 OSThread* osthread = thread->osthread(); 3607 osthread->set_interrupted(true); 3608 // More than one thread can get here with the same value of osthread, 3609 // resulting in multiple notifications. We do, however, want the store 3610 // to interrupted() to be visible to other threads before we post 3611 // the interrupt event. 3612 OrderAccess::release(); 3613 SetEvent(osthread->interrupt_event()); 3614 // For JSR166: unpark after setting status 3615 if (thread->is_Java_thread()) 3616 ((JavaThread*)thread)->parker()->unpark(); 3617 3618 ParkEvent * ev = thread->_ParkEvent; 3619 if (ev != NULL) ev->unpark(); 3620 3621} 3622 3623 3624bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3625 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), 3626 "possibility of dangling Thread pointer"); 3627 3628 OSThread* osthread = thread->osthread(); 3629 // There is no synchronization between the setting of the interrupt 3630 // and it being cleared here. It is critical - see 6535709 - that 3631 // we only clear the interrupt state, and reset the interrupt event, 3632 // if we are going to report that we were indeed interrupted - else 3633 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups 3634 // depending on the timing. By checking thread interrupt event to see 3635 // if the thread gets real interrupt thus prevent spurious wakeup. 3636 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0); 3637 if (interrupted && clear_interrupted) { 3638 osthread->set_interrupted(false); 3639 ResetEvent(osthread->interrupt_event()); 3640 } // Otherwise leave the interrupted state alone 3641 3642 return interrupted; 3643} 3644 3645// Get's a pc (hint) for a running thread. Currently used only for profiling. 3646ExtendedPC os::get_thread_pc(Thread* thread) { 3647 CONTEXT context; 3648 context.ContextFlags = CONTEXT_CONTROL; 3649 HANDLE handle = thread->osthread()->thread_handle(); 3650#ifdef _M_IA64 3651 assert(0, "Fix get_thread_pc"); 3652 return ExtendedPC(NULL); 3653#else 3654 if (GetThreadContext(handle, &context)) { 3655#ifdef _M_AMD64 3656 return ExtendedPC((address) context.Rip); 3657#else 3658 return ExtendedPC((address) context.Eip); 3659#endif 3660 } else { 3661 return ExtendedPC(NULL); 3662 } 3663#endif 3664} 3665 3666// GetCurrentThreadId() returns DWORD 3667intx os::current_thread_id() { return GetCurrentThreadId(); } 3668 3669static int _initial_pid = 0; 3670 3671int os::current_process_id() 3672{ 3673 return (_initial_pid ? _initial_pid : _getpid()); 3674} 3675 3676int os::win32::_vm_page_size = 0; 3677int os::win32::_vm_allocation_granularity = 0; 3678int os::win32::_processor_type = 0; 3679// Processor level is not available on non-NT systems, use vm_version instead 3680int os::win32::_processor_level = 0; 3681julong os::win32::_physical_memory = 0; 3682size_t os::win32::_default_stack_size = 0; 3683 3684 intx os::win32::_os_thread_limit = 0; 3685volatile intx os::win32::_os_thread_count = 0; 3686 3687bool os::win32::_is_nt = false; 3688bool os::win32::_is_windows_2003 = false; 3689bool os::win32::_is_windows_server = false; 3690 3691bool os::win32::_has_performance_count = 0; 3692 3693void os::win32::initialize_system_info() { 3694 SYSTEM_INFO si; 3695 GetSystemInfo(&si); 3696 _vm_page_size = si.dwPageSize; 3697 _vm_allocation_granularity = si.dwAllocationGranularity; 3698 _processor_type = si.dwProcessorType; 3699 _processor_level = si.wProcessorLevel; 3700 set_processor_count(si.dwNumberOfProcessors); 3701 3702 MEMORYSTATUSEX ms; 3703 ms.dwLength = sizeof(ms); 3704 3705 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual, 3706 // dwMemoryLoad (% of memory in use) 3707 GlobalMemoryStatusEx(&ms); 3708 _physical_memory = ms.ullTotalPhys; 3709 3710 OSVERSIONINFOEX oi; 3711 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX); 3712 GetVersionEx((OSVERSIONINFO*)&oi); 3713 switch (oi.dwPlatformId) { 3714 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break; 3715 case VER_PLATFORM_WIN32_NT: 3716 _is_nt = true; 3717 { 3718 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion; 3719 if (os_vers == 5002) { 3720 _is_windows_2003 = true; 3721 } 3722 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER || 3723 oi.wProductType == VER_NT_SERVER) { 3724 _is_windows_server = true; 3725 } 3726 } 3727 break; 3728 default: fatal("Unknown platform"); 3729 } 3730 3731 _default_stack_size = os::current_stack_size(); 3732 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size"); 3733 assert((_default_stack_size & (_vm_page_size - 1)) == 0, 3734 "stack size not a multiple of page size"); 3735 3736 initialize_performance_counter(); 3737 3738 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is 3739 // known to deadlock the system, if the VM issues to thread operations with 3740 // a too high frequency, e.g., such as changing the priorities. 3741 // The 6000 seems to work well - no deadlocks has been notices on the test 3742 // programs that we have seen experience this problem. 3743 if (!os::win32::is_nt()) { 3744 StarvationMonitorInterval = 6000; 3745 } 3746} 3747 3748 3749HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) { 3750 char path[MAX_PATH]; 3751 DWORD size; 3752 DWORD pathLen = (DWORD)sizeof(path); 3753 HINSTANCE result = NULL; 3754 3755 // only allow library name without path component 3756 assert(strchr(name, '\\') == NULL, "path not allowed"); 3757 assert(strchr(name, ':') == NULL, "path not allowed"); 3758 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) { 3759 jio_snprintf(ebuf, ebuflen, 3760 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name); 3761 return NULL; 3762 } 3763 3764 // search system directory 3765 if ((size = GetSystemDirectory(path, pathLen)) > 0) { 3766 strcat(path, "\\"); 3767 strcat(path, name); 3768 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3769 return result; 3770 } 3771 } 3772 3773 // try Windows directory 3774 if ((size = GetWindowsDirectory(path, pathLen)) > 0) { 3775 strcat(path, "\\"); 3776 strcat(path, name); 3777 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) { 3778 return result; 3779 } 3780 } 3781 3782 jio_snprintf(ebuf, ebuflen, 3783 "os::win32::load_windows_dll() cannot load %s from system directories.", name); 3784 return NULL; 3785} 3786 3787void os::win32::setmode_streams() { 3788 _setmode(_fileno(stdin), _O_BINARY); 3789 _setmode(_fileno(stdout), _O_BINARY); 3790 _setmode(_fileno(stderr), _O_BINARY); 3791} 3792 3793 3794bool os::is_debugger_attached() { 3795 return IsDebuggerPresent() ? true : false; 3796} 3797 3798 3799void os::wait_for_keypress_at_exit(void) { 3800 if (PauseAtExit) { 3801 fprintf(stderr, "Press any key to continue...\n"); 3802 fgetc(stdin); 3803 } 3804} 3805 3806 3807int os::message_box(const char* title, const char* message) { 3808 int result = MessageBox(NULL, message, title, 3809 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY); 3810 return result == IDYES; 3811} 3812 3813int os::allocate_thread_local_storage() { 3814 return TlsAlloc(); 3815} 3816 3817 3818void os::free_thread_local_storage(int index) { 3819 TlsFree(index); 3820} 3821 3822 3823void os::thread_local_storage_at_put(int index, void* value) { 3824 TlsSetValue(index, value); 3825 assert(thread_local_storage_at(index) == value, "Just checking"); 3826} 3827 3828 3829void* os::thread_local_storage_at(int index) { 3830 return TlsGetValue(index); 3831} 3832 3833 3834#ifndef PRODUCT 3835#ifndef _WIN64 3836// Helpers to check whether NX protection is enabled 3837int nx_exception_filter(_EXCEPTION_POINTERS *pex) { 3838 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && 3839 pex->ExceptionRecord->NumberParameters > 0 && 3840 pex->ExceptionRecord->ExceptionInformation[0] == 3841 EXCEPTION_INFO_EXEC_VIOLATION) { 3842 return EXCEPTION_EXECUTE_HANDLER; 3843 } 3844 return EXCEPTION_CONTINUE_SEARCH; 3845} 3846 3847void nx_check_protection() { 3848 // If NX is enabled we'll get an exception calling into code on the stack 3849 char code[] = { (char)0xC3 }; // ret 3850 void *code_ptr = (void *)code; 3851 __try { 3852 __asm call code_ptr 3853 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) { 3854 tty->print_raw_cr("NX protection detected."); 3855 } 3856} 3857#endif // _WIN64 3858#endif // PRODUCT 3859 3860// this is called _before_ the global arguments have been parsed 3861void os::init(void) { 3862 _initial_pid = _getpid(); 3863 3864 init_random(1234567); 3865 3866 win32::initialize_system_info(); 3867 win32::setmode_streams(); 3868 init_page_sizes((size_t) win32::vm_page_size()); 3869 3870 // This may be overridden later when argument processing is done. 3871 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, 3872 os::win32::is_windows_2003()); 3873 3874 // Initialize main_process and main_thread 3875 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle 3876 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process, 3877 &main_thread, THREAD_ALL_ACCESS, false, 0)) { 3878 fatal("DuplicateHandle failed\n"); 3879 } 3880 main_thread_id = (int) GetCurrentThreadId(); 3881} 3882 3883// To install functions for atexit processing 3884extern "C" { 3885 static void perfMemory_exit_helper() { 3886 perfMemory_exit(); 3887 } 3888} 3889 3890static jint initSock(); 3891 3892// this is called _after_ the global arguments have been parsed 3893jint os::init_2(void) { 3894 // Allocate a single page and mark it as readable for safepoint polling 3895 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY); 3896 guarantee(polling_page != NULL, "Reserve Failed for polling page"); 3897 3898 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY); 3899 guarantee(return_page != NULL, "Commit Failed for polling page"); 3900 3901 os::set_polling_page(polling_page); 3902 3903#ifndef PRODUCT 3904 if (Verbose && PrintMiscellaneous) 3905 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 3906#endif 3907 3908 if (!UseMembar) { 3909 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE); 3910 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page"); 3911 3912 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE); 3913 guarantee(return_page != NULL, "Commit Failed for memory serialize page"); 3914 3915 os::set_memory_serialize_page(mem_serialize_page); 3916 3917#ifndef PRODUCT 3918 if (Verbose && PrintMiscellaneous) 3919 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 3920#endif 3921 } 3922 3923 // Setup Windows Exceptions 3924 3925 // for debugging float code generation bugs 3926 if (ForceFloatExceptions) { 3927#ifndef _WIN64 3928 static long fp_control_word = 0; 3929 __asm { fstcw fp_control_word } 3930 // see Intel PPro Manual, Vol. 2, p 7-16 3931 const long precision = 0x20; 3932 const long underflow = 0x10; 3933 const long overflow = 0x08; 3934 const long zero_div = 0x04; 3935 const long denorm = 0x02; 3936 const long invalid = 0x01; 3937 fp_control_word |= invalid; 3938 __asm { fldcw fp_control_word } 3939#endif 3940 } 3941 3942 // If stack_commit_size is 0, windows will reserve the default size, 3943 // but only commit a small portion of it. 3944 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size()); 3945 size_t default_reserve_size = os::win32::default_stack_size(); 3946 size_t actual_reserve_size = stack_commit_size; 3947 if (stack_commit_size < default_reserve_size) { 3948 // If stack_commit_size == 0, we want this too 3949 actual_reserve_size = default_reserve_size; 3950 } 3951 3952 // Check minimum allowable stack size for thread creation and to initialize 3953 // the java system classes, including StackOverflowError - depends on page 3954 // size. Add a page for compiler2 recursion in main thread. 3955 // Add in 2*BytesPerWord times page size to account for VM stack during 3956 // class initialization depending on 32 or 64 bit VM. 3957 size_t min_stack_allowed = 3958 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 3959 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size(); 3960 if (actual_reserve_size < min_stack_allowed) { 3961 tty->print_cr("\nThe stack size specified is too small, " 3962 "Specify at least %dk", 3963 min_stack_allowed / K); 3964 return JNI_ERR; 3965 } 3966 3967 JavaThread::set_stack_size_at_create(stack_commit_size); 3968 3969 // Calculate theoretical max. size of Threads to guard gainst artifical 3970 // out-of-memory situations, where all available address-space has been 3971 // reserved by thread stacks. 3972 assert(actual_reserve_size != 0, "Must have a stack"); 3973 3974 // Calculate the thread limit when we should start doing Virtual Memory 3975 // banging. Currently when the threads will have used all but 200Mb of space. 3976 // 3977 // TODO: consider performing a similar calculation for commit size instead 3978 // as reserve size, since on a 64-bit platform we'll run into that more 3979 // often than running out of virtual memory space. We can use the 3980 // lower value of the two calculations as the os_thread_limit. 3981 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K); 3982 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size); 3983 3984 // at exit methods are called in the reverse order of their registration. 3985 // there is no limit to the number of functions registered. atexit does 3986 // not set errno. 3987 3988 if (PerfAllowAtExitRegistration) { 3989 // only register atexit functions if PerfAllowAtExitRegistration is set. 3990 // atexit functions can be delayed until process exit time, which 3991 // can be problematic for embedded VM situations. Embedded VMs should 3992 // call DestroyJavaVM() to assure that VM resources are released. 3993 3994 // note: perfMemory_exit_helper atexit function may be removed in 3995 // the future if the appropriate cleanup code can be added to the 3996 // VM_Exit VMOperation's doit method. 3997 if (atexit(perfMemory_exit_helper) != 0) { 3998 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3999 } 4000 } 4001 4002#ifndef _WIN64 4003 // Print something if NX is enabled (win32 on AMD64) 4004 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection()); 4005#endif 4006 4007 // initialize thread priority policy 4008 prio_init(); 4009 4010 if (UseNUMA && !ForceNUMA) { 4011 UseNUMA = false; // We don't fully support this yet 4012 } 4013 4014 if (UseNUMAInterleaving) { 4015 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag 4016 bool success = numa_interleaving_init(); 4017 if (!success) UseNUMAInterleaving = false; 4018 } 4019 4020 if (initSock() != JNI_OK) { 4021 return JNI_ERR; 4022 } 4023 4024 return JNI_OK; 4025} 4026 4027void os::init_3(void) { 4028 return; 4029} 4030 4031// Mark the polling page as unreadable 4032void os::make_polling_page_unreadable(void) { 4033 DWORD old_status; 4034 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status)) 4035 fatal("Could not disable polling page"); 4036}; 4037 4038// Mark the polling page as readable 4039void os::make_polling_page_readable(void) { 4040 DWORD old_status; 4041 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status)) 4042 fatal("Could not enable polling page"); 4043}; 4044 4045 4046int os::stat(const char *path, struct stat *sbuf) { 4047 char pathbuf[MAX_PATH]; 4048 if (strlen(path) > MAX_PATH - 1) { 4049 errno = ENAMETOOLONG; 4050 return -1; 4051 } 4052 os::native_path(strcpy(pathbuf, path)); 4053 int ret = ::stat(pathbuf, sbuf); 4054 if (sbuf != NULL && UseUTCFileTimestamp) { 4055 // Fix for 6539723. st_mtime returned from stat() is dependent on 4056 // the system timezone and so can return different values for the 4057 // same file if/when daylight savings time changes. This adjustment 4058 // makes sure the same timestamp is returned regardless of the TZ. 4059 // 4060 // See: 4061 // http://msdn.microsoft.com/library/ 4062 // default.asp?url=/library/en-us/sysinfo/base/ 4063 // time_zone_information_str.asp 4064 // and 4065 // http://msdn.microsoft.com/library/default.asp?url= 4066 // /library/en-us/sysinfo/base/settimezoneinformation.asp 4067 // 4068 // NOTE: there is a insidious bug here: If the timezone is changed 4069 // after the call to stat() but before 'GetTimeZoneInformation()', then 4070 // the adjustment we do here will be wrong and we'll return the wrong 4071 // value (which will likely end up creating an invalid class data 4072 // archive). Absent a better API for this, or some time zone locking 4073 // mechanism, we'll have to live with this risk. 4074 TIME_ZONE_INFORMATION tz; 4075 DWORD tzid = GetTimeZoneInformation(&tz); 4076 int daylightBias = 4077 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias; 4078 sbuf->st_mtime += (tz.Bias + daylightBias) * 60; 4079 } 4080 return ret; 4081} 4082 4083 4084#define FT2INT64(ft) \ 4085 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime)) 4086 4087 4088// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4089// are used by JVM M&M and JVMTI to get user+sys or user CPU time 4090// of a thread. 4091// 4092// current_thread_cpu_time() and thread_cpu_time(Thread*) returns 4093// the fast estimate available on the platform. 4094 4095// current_thread_cpu_time() is not optimized for Windows yet 4096jlong os::current_thread_cpu_time() { 4097 // return user + sys since the cost is the same 4098 return os::thread_cpu_time(Thread::current(), true /* user+sys */); 4099} 4100 4101jlong os::thread_cpu_time(Thread* thread) { 4102 // consistent with what current_thread_cpu_time() returns. 4103 return os::thread_cpu_time(thread, true /* user+sys */); 4104} 4105 4106jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4107 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4108} 4109 4110jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) { 4111 // This code is copy from clasic VM -> hpi::sysThreadCPUTime 4112 // If this function changes, os::is_thread_cpu_time_supported() should too 4113 if (os::win32::is_nt()) { 4114 FILETIME CreationTime; 4115 FILETIME ExitTime; 4116 FILETIME KernelTime; 4117 FILETIME UserTime; 4118 4119 if (GetThreadTimes(thread->osthread()->thread_handle(), 4120 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 4121 return -1; 4122 else 4123 if (user_sys_cpu_time) { 4124 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100; 4125 } else { 4126 return FT2INT64(UserTime) * 100; 4127 } 4128 } else { 4129 return (jlong) timeGetTime() * 1000000; 4130 } 4131} 4132 4133void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4134 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4135 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4136 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4137 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4138} 4139 4140void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4141 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits 4142 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time 4143 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time 4144 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4145} 4146 4147bool os::is_thread_cpu_time_supported() { 4148 // see os::thread_cpu_time 4149 if (os::win32::is_nt()) { 4150 FILETIME CreationTime; 4151 FILETIME ExitTime; 4152 FILETIME KernelTime; 4153 FILETIME UserTime; 4154 4155 if (GetThreadTimes(GetCurrentThread(), 4156 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0) 4157 return false; 4158 else 4159 return true; 4160 } else { 4161 return false; 4162 } 4163} 4164 4165// Windows does't provide a loadavg primitive so this is stubbed out for now. 4166// It does have primitives (PDH API) to get CPU usage and run queue length. 4167// "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length" 4168// If we wanted to implement loadavg on Windows, we have a few options: 4169// 4170// a) Query CPU usage and run queue length and "fake" an answer by 4171// returning the CPU usage if it's under 100%, and the run queue 4172// length otherwise. It turns out that querying is pretty slow 4173// on Windows, on the order of 200 microseconds on a fast machine. 4174// Note that on the Windows the CPU usage value is the % usage 4175// since the last time the API was called (and the first call 4176// returns 100%), so we'd have to deal with that as well. 4177// 4178// b) Sample the "fake" answer using a sampling thread and store 4179// the answer in a global variable. The call to loadavg would 4180// just return the value of the global, avoiding the slow query. 4181// 4182// c) Sample a better answer using exponential decay to smooth the 4183// value. This is basically the algorithm used by UNIX kernels. 4184// 4185// Note that sampling thread starvation could affect both (b) and (c). 4186int os::loadavg(double loadavg[], int nelem) { 4187 return -1; 4188} 4189 4190 4191// DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield() 4192bool os::dont_yield() { 4193 return DontYieldALot; 4194} 4195 4196// This method is a slightly reworked copy of JDK's sysOpen 4197// from src/windows/hpi/src/sys_api_md.c 4198 4199int os::open(const char *path, int oflag, int mode) { 4200 char pathbuf[MAX_PATH]; 4201 4202 if (strlen(path) > MAX_PATH - 1) { 4203 errno = ENAMETOOLONG; 4204 return -1; 4205 } 4206 os::native_path(strcpy(pathbuf, path)); 4207 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode); 4208} 4209 4210FILE* os::open(int fd, const char* mode) { 4211 return ::_fdopen(fd, mode); 4212} 4213 4214// Is a (classpath) directory empty? 4215bool os::dir_is_empty(const char* path) { 4216 WIN32_FIND_DATA fd; 4217 HANDLE f = FindFirstFile(path, &fd); 4218 if (f == INVALID_HANDLE_VALUE) { 4219 return true; 4220 } 4221 FindClose(f); 4222 return false; 4223} 4224 4225// create binary file, rewriting existing file if required 4226int os::create_binary_file(const char* path, bool rewrite_existing) { 4227 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY; 4228 if (!rewrite_existing) { 4229 oflags |= _O_EXCL; 4230 } 4231 return ::open(path, oflags, _S_IREAD | _S_IWRITE); 4232} 4233 4234// return current position of file pointer 4235jlong os::current_file_offset(int fd) { 4236 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR); 4237} 4238 4239// move file pointer to the specified offset 4240jlong os::seek_to_file_offset(int fd, jlong offset) { 4241 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET); 4242} 4243 4244 4245jlong os::lseek(int fd, jlong offset, int whence) { 4246 return (jlong) ::_lseeki64(fd, offset, whence); 4247} 4248 4249// This method is a slightly reworked copy of JDK's sysNativePath 4250// from src/windows/hpi/src/path_md.c 4251 4252/* Convert a pathname to native format. On win32, this involves forcing all 4253 separators to be '\\' rather than '/' (both are legal inputs, but Win95 4254 sometimes rejects '/') and removing redundant separators. The input path is 4255 assumed to have been converted into the character encoding used by the local 4256 system. Because this might be a double-byte encoding, care is taken to 4257 treat double-byte lead characters correctly. 4258 4259 This procedure modifies the given path in place, as the result is never 4260 longer than the original. There is no error return; this operation always 4261 succeeds. */ 4262char * os::native_path(char *path) { 4263 char *src = path, *dst = path, *end = path; 4264 char *colon = NULL; /* If a drive specifier is found, this will 4265 point to the colon following the drive 4266 letter */ 4267 4268 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */ 4269 assert(((!::IsDBCSLeadByte('/')) 4270 && (!::IsDBCSLeadByte('\\')) 4271 && (!::IsDBCSLeadByte(':'))), 4272 "Illegal lead byte"); 4273 4274 /* Check for leading separators */ 4275#define isfilesep(c) ((c) == '/' || (c) == '\\') 4276 while (isfilesep(*src)) { 4277 src++; 4278 } 4279 4280 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') { 4281 /* Remove leading separators if followed by drive specifier. This 4282 hack is necessary to support file URLs containing drive 4283 specifiers (e.g., "file://c:/path"). As a side effect, 4284 "/c:/path" can be used as an alternative to "c:/path". */ 4285 *dst++ = *src++; 4286 colon = dst; 4287 *dst++ = ':'; 4288 src++; 4289 } else { 4290 src = path; 4291 if (isfilesep(src[0]) && isfilesep(src[1])) { 4292 /* UNC pathname: Retain first separator; leave src pointed at 4293 second separator so that further separators will be collapsed 4294 into the second separator. The result will be a pathname 4295 beginning with "\\\\" followed (most likely) by a host name. */ 4296 src = dst = path + 1; 4297 path[0] = '\\'; /* Force first separator to '\\' */ 4298 } 4299 } 4300 4301 end = dst; 4302 4303 /* Remove redundant separators from remainder of path, forcing all 4304 separators to be '\\' rather than '/'. Also, single byte space 4305 characters are removed from the end of the path because those 4306 are not legal ending characters on this operating system. 4307 */ 4308 while (*src != '\0') { 4309 if (isfilesep(*src)) { 4310 *dst++ = '\\'; src++; 4311 while (isfilesep(*src)) src++; 4312 if (*src == '\0') { 4313 /* Check for trailing separator */ 4314 end = dst; 4315 if (colon == dst - 2) break; /* "z:\\" */ 4316 if (dst == path + 1) break; /* "\\" */ 4317 if (dst == path + 2 && isfilesep(path[0])) { 4318 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the 4319 beginning of a UNC pathname. Even though it is not, by 4320 itself, a valid UNC pathname, we leave it as is in order 4321 to be consistent with the path canonicalizer as well 4322 as the win32 APIs, which treat this case as an invalid 4323 UNC pathname rather than as an alias for the root 4324 directory of the current drive. */ 4325 break; 4326 } 4327 end = --dst; /* Path does not denote a root directory, so 4328 remove trailing separator */ 4329 break; 4330 } 4331 end = dst; 4332 } else { 4333 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */ 4334 *dst++ = *src++; 4335 if (*src) *dst++ = *src++; 4336 end = dst; 4337 } else { /* Copy a single-byte character */ 4338 char c = *src++; 4339 *dst++ = c; 4340 /* Space is not a legal ending character */ 4341 if (c != ' ') end = dst; 4342 } 4343 } 4344 } 4345 4346 *end = '\0'; 4347 4348 /* For "z:", add "." to work around a bug in the C runtime library */ 4349 if (colon == dst - 1) { 4350 path[2] = '.'; 4351 path[3] = '\0'; 4352 } 4353 4354 return path; 4355} 4356 4357// This code is a copy of JDK's sysSetLength 4358// from src/windows/hpi/src/sys_api_md.c 4359 4360int os::ftruncate(int fd, jlong length) { 4361 HANDLE h = (HANDLE)::_get_osfhandle(fd); 4362 long high = (long)(length >> 32); 4363 DWORD ret; 4364 4365 if (h == (HANDLE)(-1)) { 4366 return -1; 4367 } 4368 4369 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN); 4370 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) { 4371 return -1; 4372 } 4373 4374 if (::SetEndOfFile(h) == FALSE) { 4375 return -1; 4376 } 4377 4378 return 0; 4379} 4380 4381 4382// This code is a copy of JDK's sysSync 4383// from src/windows/hpi/src/sys_api_md.c 4384// except for the legacy workaround for a bug in Win 98 4385 4386int os::fsync(int fd) { 4387 HANDLE handle = (HANDLE)::_get_osfhandle(fd); 4388 4389 if ((!::FlushFileBuffers(handle)) && 4390 (GetLastError() != ERROR_ACCESS_DENIED) ) { 4391 /* from winerror.h */ 4392 return -1; 4393 } 4394 return 0; 4395} 4396 4397static int nonSeekAvailable(int, long *); 4398static int stdinAvailable(int, long *); 4399 4400#define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR) 4401#define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO) 4402 4403// This code is a copy of JDK's sysAvailable 4404// from src/windows/hpi/src/sys_api_md.c 4405 4406int os::available(int fd, jlong *bytes) { 4407 jlong cur, end; 4408 struct _stati64 stbuf64; 4409 4410 if (::_fstati64(fd, &stbuf64) >= 0) { 4411 int mode = stbuf64.st_mode; 4412 if (S_ISCHR(mode) || S_ISFIFO(mode)) { 4413 int ret; 4414 long lpbytes; 4415 if (fd == 0) { 4416 ret = stdinAvailable(fd, &lpbytes); 4417 } else { 4418 ret = nonSeekAvailable(fd, &lpbytes); 4419 } 4420 (*bytes) = (jlong)(lpbytes); 4421 return ret; 4422 } 4423 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) { 4424 return FALSE; 4425 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) { 4426 return FALSE; 4427 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) { 4428 return FALSE; 4429 } 4430 *bytes = end - cur; 4431 return TRUE; 4432 } else { 4433 return FALSE; 4434 } 4435} 4436 4437// This code is a copy of JDK's nonSeekAvailable 4438// from src/windows/hpi/src/sys_api_md.c 4439 4440static int nonSeekAvailable(int fd, long *pbytes) { 4441 /* This is used for available on non-seekable devices 4442 * (like both named and anonymous pipes, such as pipes 4443 * connected to an exec'd process). 4444 * Standard Input is a special case. 4445 * 4446 */ 4447 HANDLE han; 4448 4449 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) { 4450 return FALSE; 4451 } 4452 4453 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) { 4454 /* PeekNamedPipe fails when at EOF. In that case we 4455 * simply make *pbytes = 0 which is consistent with the 4456 * behavior we get on Solaris when an fd is at EOF. 4457 * The only alternative is to raise an Exception, 4458 * which isn't really warranted. 4459 */ 4460 if (::GetLastError() != ERROR_BROKEN_PIPE) { 4461 return FALSE; 4462 } 4463 *pbytes = 0; 4464 } 4465 return TRUE; 4466} 4467 4468#define MAX_INPUT_EVENTS 2000 4469 4470// This code is a copy of JDK's stdinAvailable 4471// from src/windows/hpi/src/sys_api_md.c 4472 4473static int stdinAvailable(int fd, long *pbytes) { 4474 HANDLE han; 4475 DWORD numEventsRead = 0; /* Number of events read from buffer */ 4476 DWORD numEvents = 0; /* Number of events in buffer */ 4477 DWORD i = 0; /* Loop index */ 4478 DWORD curLength = 0; /* Position marker */ 4479 DWORD actualLength = 0; /* Number of bytes readable */ 4480 BOOL error = FALSE; /* Error holder */ 4481 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */ 4482 4483 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) { 4484 return FALSE; 4485 } 4486 4487 /* Construct an array of input records in the console buffer */ 4488 error = ::GetNumberOfConsoleInputEvents(han, &numEvents); 4489 if (error == 0) { 4490 return nonSeekAvailable(fd, pbytes); 4491 } 4492 4493 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */ 4494 if (numEvents > MAX_INPUT_EVENTS) { 4495 numEvents = MAX_INPUT_EVENTS; 4496 } 4497 4498 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal); 4499 if (lpBuffer == NULL) { 4500 return FALSE; 4501 } 4502 4503 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead); 4504 if (error == 0) { 4505 os::free(lpBuffer, mtInternal); 4506 return FALSE; 4507 } 4508 4509 /* Examine input records for the number of bytes available */ 4510 for (i=0; i<numEvents; i++) { 4511 if (lpBuffer[i].EventType == KEY_EVENT) { 4512 4513 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *) 4514 &(lpBuffer[i].Event); 4515 if (keyRecord->bKeyDown == TRUE) { 4516 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar); 4517 curLength++; 4518 if (*keyPressed == '\r') { 4519 actualLength = curLength; 4520 } 4521 } 4522 } 4523 } 4524 4525 if (lpBuffer != NULL) { 4526 os::free(lpBuffer, mtInternal); 4527 } 4528 4529 *pbytes = (long) actualLength; 4530 return TRUE; 4531} 4532 4533// Map a block of memory. 4534char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4535 char *addr, size_t bytes, bool read_only, 4536 bool allow_exec) { 4537 HANDLE hFile; 4538 char* base; 4539 4540 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL, 4541 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 4542 if (hFile == NULL) { 4543 if (PrintMiscellaneous && Verbose) { 4544 DWORD err = GetLastError(); 4545 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err); 4546 } 4547 return NULL; 4548 } 4549 4550 if (allow_exec) { 4551 // CreateFileMapping/MapViewOfFileEx can't map executable memory 4552 // unless it comes from a PE image (which the shared archive is not.) 4553 // Even VirtualProtect refuses to give execute access to mapped memory 4554 // that was not previously executable. 4555 // 4556 // Instead, stick the executable region in anonymous memory. Yuck. 4557 // Penalty is that ~4 pages will not be shareable - in the future 4558 // we might consider DLLizing the shared archive with a proper PE 4559 // header so that mapping executable + sharing is possible. 4560 4561 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE, 4562 PAGE_READWRITE); 4563 if (base == NULL) { 4564 if (PrintMiscellaneous && Verbose) { 4565 DWORD err = GetLastError(); 4566 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err); 4567 } 4568 CloseHandle(hFile); 4569 return NULL; 4570 } 4571 4572 DWORD bytes_read; 4573 OVERLAPPED overlapped; 4574 overlapped.Offset = (DWORD)file_offset; 4575 overlapped.OffsetHigh = 0; 4576 overlapped.hEvent = NULL; 4577 // ReadFile guarantees that if the return value is true, the requested 4578 // number of bytes were read before returning. 4579 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0; 4580 if (!res) { 4581 if (PrintMiscellaneous && Verbose) { 4582 DWORD err = GetLastError(); 4583 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err); 4584 } 4585 release_memory(base, bytes); 4586 CloseHandle(hFile); 4587 return NULL; 4588 } 4589 } else { 4590 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0, 4591 NULL /*file_name*/); 4592 if (hMap == NULL) { 4593 if (PrintMiscellaneous && Verbose) { 4594 DWORD err = GetLastError(); 4595 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err); 4596 } 4597 CloseHandle(hFile); 4598 return NULL; 4599 } 4600 4601 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY; 4602 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset, 4603 (DWORD)bytes, addr); 4604 if (base == NULL) { 4605 if (PrintMiscellaneous && Verbose) { 4606 DWORD err = GetLastError(); 4607 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err); 4608 } 4609 CloseHandle(hMap); 4610 CloseHandle(hFile); 4611 return NULL; 4612 } 4613 4614 if (CloseHandle(hMap) == 0) { 4615 if (PrintMiscellaneous && Verbose) { 4616 DWORD err = GetLastError(); 4617 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err); 4618 } 4619 CloseHandle(hFile); 4620 return base; 4621 } 4622 } 4623 4624 if (allow_exec) { 4625 DWORD old_protect; 4626 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE; 4627 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0; 4628 4629 if (!res) { 4630 if (PrintMiscellaneous && Verbose) { 4631 DWORD err = GetLastError(); 4632 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err); 4633 } 4634 // Don't consider this a hard error, on IA32 even if the 4635 // VirtualProtect fails, we should still be able to execute 4636 CloseHandle(hFile); 4637 return base; 4638 } 4639 } 4640 4641 if (CloseHandle(hFile) == 0) { 4642 if (PrintMiscellaneous && Verbose) { 4643 DWORD err = GetLastError(); 4644 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err); 4645 } 4646 return base; 4647 } 4648 4649 return base; 4650} 4651 4652 4653// Remap a block of memory. 4654char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4655 char *addr, size_t bytes, bool read_only, 4656 bool allow_exec) { 4657 // This OS does not allow existing memory maps to be remapped so we 4658 // have to unmap the memory before we remap it. 4659 if (!os::unmap_memory(addr, bytes)) { 4660 return NULL; 4661 } 4662 4663 // There is a very small theoretical window between the unmap_memory() 4664 // call above and the map_memory() call below where a thread in native 4665 // code may be able to access an address that is no longer mapped. 4666 4667 return os::map_memory(fd, file_name, file_offset, addr, bytes, 4668 read_only, allow_exec); 4669} 4670 4671 4672// Unmap a block of memory. 4673// Returns true=success, otherwise false. 4674 4675bool os::pd_unmap_memory(char* addr, size_t bytes) { 4676 BOOL result = UnmapViewOfFile(addr); 4677 if (result == 0) { 4678 if (PrintMiscellaneous && Verbose) { 4679 DWORD err = GetLastError(); 4680 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err); 4681 } 4682 return false; 4683 } 4684 return true; 4685} 4686 4687void os::pause() { 4688 char filename[MAX_PATH]; 4689 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4690 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4691 } else { 4692 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4693 } 4694 4695 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4696 if (fd != -1) { 4697 struct stat buf; 4698 ::close(fd); 4699 while (::stat(filename, &buf) == 0) { 4700 Sleep(100); 4701 } 4702 } else { 4703 jio_fprintf(stderr, 4704 "Could not open pause file '%s', continuing immediately.\n", filename); 4705 } 4706} 4707 4708os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { 4709 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); 4710} 4711 4712/* 4713 * See the caveats for this class in os_windows.hpp 4714 * Protects the callback call so that raised OS EXCEPTIONS causes a jump back 4715 * into this method and returns false. If no OS EXCEPTION was raised, returns 4716 * true. 4717 * The callback is supposed to provide the method that should be protected. 4718 */ 4719bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { 4720 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); 4721 assert(!WatcherThread::watcher_thread()->has_crash_protection(), 4722 "crash_protection already set?"); 4723 4724 bool success = true; 4725 __try { 4726 WatcherThread::watcher_thread()->set_crash_protection(this); 4727 cb.call(); 4728 } __except(EXCEPTION_EXECUTE_HANDLER) { 4729 // only for protection, nothing to do 4730 success = false; 4731 } 4732 WatcherThread::watcher_thread()->set_crash_protection(NULL); 4733 return success; 4734} 4735 4736// An Event wraps a win32 "CreateEvent" kernel handle. 4737// 4738// We have a number of choices regarding "CreateEvent" win32 handle leakage: 4739// 4740// 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle 4741// field, and call CloseHandle() on the win32 event handle. Unpark() would 4742// need to be modified to tolerate finding a NULL (invalid) win32 event handle. 4743// In addition, an unpark() operation might fetch the handle field, but the 4744// event could recycle between the fetch and the SetEvent() operation. 4745// SetEvent() would either fail because the handle was invalid, or inadvertently work, 4746// as the win32 handle value had been recycled. In an ideal world calling SetEvent() 4747// on an stale but recycled handle would be harmless, but in practice this might 4748// confuse other non-Sun code, so it's not a viable approach. 4749// 4750// 2: Once a win32 event handle is associated with an Event, it remains associated 4751// with the Event. The event handle is never closed. This could be construed 4752// as handle leakage, but only up to the maximum # of threads that have been extant 4753// at any one time. This shouldn't be an issue, as windows platforms typically 4754// permit a process to have hundreds of thousands of open handles. 4755// 4756// 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList 4757// and release unused handles. 4758// 4759// 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle. 4760// It's not clear, however, that we wouldn't be trading one type of leak for another. 4761// 4762// 5. Use an RCU-like mechanism (Read-Copy Update). 4763// Or perhaps something similar to Maged Michael's "Hazard pointers". 4764// 4765// We use (2). 4766// 4767// TODO-FIXME: 4768// 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation. 4769// 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks 4770// to recover from (or at least detect) the dreaded Windows 841176 bug. 4771// 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent 4772// into a single win32 CreateEvent() handle. 4773// 4774// _Event transitions in park() 4775// -1 => -1 : illegal 4776// 1 => 0 : pass - return immediately 4777// 0 => -1 : block 4778// 4779// _Event serves as a restricted-range semaphore : 4780// -1 : thread is blocked 4781// 0 : neutral - thread is running or ready 4782// 1 : signaled - thread is running or ready 4783// 4784// Another possible encoding of _Event would be 4785// with explicit "PARKED" and "SIGNALED" bits. 4786 4787int os::PlatformEvent::park (jlong Millis) { 4788 guarantee(_ParkHandle != NULL , "Invariant"); 4789 guarantee(Millis > 0 , "Invariant"); 4790 int v; 4791 4792 // CONSIDER: defer assigning a CreateEvent() handle to the Event until 4793 // the initial park() operation. 4794 4795 for (;;) { 4796 v = _Event; 4797 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4798 } 4799 guarantee((v == 0) || (v == 1), "invariant"); 4800 if (v != 0) return OS_OK; 4801 4802 // Do this the hard way by blocking ... 4803 // TODO: consider a brief spin here, gated on the success of recent 4804 // spin attempts by this thread. 4805 // 4806 // We decompose long timeouts into series of shorter timed waits. 4807 // Evidently large timo values passed in WaitForSingleObject() are problematic on some 4808 // versions of Windows. See EventWait() for details. This may be superstition. Or not. 4809 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time 4810 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from 4811 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend 4812 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv == 4813 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate 4814 // for the already waited time. This policy does not admit any new outcomes. 4815 // In the future, however, we might want to track the accumulated wait time and 4816 // adjust Millis accordingly if we encounter a spurious wakeup. 4817 4818 const int MAXTIMEOUT = 0x10000000; 4819 DWORD rv = WAIT_TIMEOUT; 4820 while (_Event < 0 && Millis > 0) { 4821 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT) 4822 if (Millis > MAXTIMEOUT) { 4823 prd = MAXTIMEOUT; 4824 } 4825 rv = ::WaitForSingleObject(_ParkHandle, prd); 4826 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed"); 4827 if (rv == WAIT_TIMEOUT) { 4828 Millis -= prd; 4829 } 4830 } 4831 v = _Event; 4832 _Event = 0; 4833 // see comment at end of os::PlatformEvent::park() below: 4834 OrderAccess::fence(); 4835 // If we encounter a nearly simultanous timeout expiry and unpark() 4836 // we return OS_OK indicating we awoke via unpark(). 4837 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however. 4838 return (v >= 0) ? OS_OK : OS_TIMEOUT; 4839} 4840 4841void os::PlatformEvent::park() { 4842 guarantee(_ParkHandle != NULL, "Invariant"); 4843 // Invariant: Only the thread associated with the Event/PlatformEvent 4844 // may call park(). 4845 int v; 4846 for (;;) { 4847 v = _Event; 4848 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4849 } 4850 guarantee((v == 0) || (v == 1), "invariant"); 4851 if (v != 0) return; 4852 4853 // Do this the hard way by blocking ... 4854 // TODO: consider a brief spin here, gated on the success of recent 4855 // spin attempts by this thread. 4856 while (_Event < 0) { 4857 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE); 4858 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed"); 4859 } 4860 4861 // Usually we'll find _Event == 0 at this point, but as 4862 // an optional optimization we clear it, just in case can 4863 // multiple unpark() operations drove _Event up to 1. 4864 _Event = 0; 4865 OrderAccess::fence(); 4866 guarantee(_Event >= 0, "invariant"); 4867} 4868 4869void os::PlatformEvent::unpark() { 4870 guarantee(_ParkHandle != NULL, "Invariant"); 4871 4872 // Transitions for _Event: 4873 // 0 :=> 1 4874 // 1 :=> 1 4875 // -1 :=> either 0 or 1; must signal target thread 4876 // That is, we can safely transition _Event from -1 to either 4877 // 0 or 1. 4878 // See also: "Semaphores in Plan 9" by Mullender & Cox 4879 // 4880 // Note: Forcing a transition from "-1" to "1" on an unpark() means 4881 // that it will take two back-to-back park() calls for the owning 4882 // thread to block. This has the benefit of forcing a spurious return 4883 // from the first park() call after an unpark() call which will help 4884 // shake out uses of park() and unpark() without condition variables. 4885 4886 if (Atomic::xchg(1, &_Event) >= 0) return; 4887 4888 ::SetEvent(_ParkHandle); 4889} 4890 4891 4892// JSR166 4893// ------------------------------------------------------- 4894 4895/* 4896 * The Windows implementation of Park is very straightforward: Basic 4897 * operations on Win32 Events turn out to have the right semantics to 4898 * use them directly. We opportunistically resuse the event inherited 4899 * from Monitor. 4900 */ 4901 4902 4903void Parker::park(bool isAbsolute, jlong time) { 4904 guarantee(_ParkEvent != NULL, "invariant"); 4905 // First, demultiplex/decode time arguments 4906 if (time < 0) { // don't wait 4907 return; 4908 } 4909 else if (time == 0 && !isAbsolute) { 4910 time = INFINITE; 4911 } 4912 else if (isAbsolute) { 4913 time -= os::javaTimeMillis(); // convert to relative time 4914 if (time <= 0) // already elapsed 4915 return; 4916 } 4917 else { // relative 4918 time /= 1000000; // Must coarsen from nanos to millis 4919 if (time == 0) // Wait for the minimal time unit if zero 4920 time = 1; 4921 } 4922 4923 JavaThread* thread = (JavaThread*)(Thread::current()); 4924 assert(thread->is_Java_thread(), "Must be JavaThread"); 4925 JavaThread *jt = (JavaThread *)thread; 4926 4927 // Don't wait if interrupted or already triggered 4928 if (Thread::is_interrupted(thread, false) || 4929 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) { 4930 ResetEvent(_ParkEvent); 4931 return; 4932 } 4933 else { 4934 ThreadBlockInVM tbivm(jt); 4935 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4936 jt->set_suspend_equivalent(); 4937 4938 WaitForSingleObject(_ParkEvent, time); 4939 ResetEvent(_ParkEvent); 4940 4941 // If externally suspended while waiting, re-suspend 4942 if (jt->handle_special_suspend_equivalent_condition()) { 4943 jt->java_suspend_self(); 4944 } 4945 } 4946} 4947 4948void Parker::unpark() { 4949 guarantee(_ParkEvent != NULL, "invariant"); 4950 SetEvent(_ParkEvent); 4951} 4952 4953// Run the specified command in a separate process. Return its exit value, 4954// or -1 on failure (e.g. can't create a new process). 4955int os::fork_and_exec(char* cmd) { 4956 STARTUPINFO si; 4957 PROCESS_INFORMATION pi; 4958 4959 memset(&si, 0, sizeof(si)); 4960 si.cb = sizeof(si); 4961 memset(&pi, 0, sizeof(pi)); 4962 BOOL rslt = CreateProcess(NULL, // executable name - use command line 4963 cmd, // command line 4964 NULL, // process security attribute 4965 NULL, // thread security attribute 4966 TRUE, // inherits system handles 4967 0, // no creation flags 4968 NULL, // use parent's environment block 4969 NULL, // use parent's starting directory 4970 &si, // (in) startup information 4971 &pi); // (out) process information 4972 4973 if (rslt) { 4974 // Wait until child process exits. 4975 WaitForSingleObject(pi.hProcess, INFINITE); 4976 4977 DWORD exit_code; 4978 GetExitCodeProcess(pi.hProcess, &exit_code); 4979 4980 // Close process and thread handles. 4981 CloseHandle(pi.hProcess); 4982 CloseHandle(pi.hThread); 4983 4984 return (int)exit_code; 4985 } else { 4986 return -1; 4987 } 4988} 4989 4990//-------------------------------------------------------------------------------------------------- 4991// Non-product code 4992 4993static int mallocDebugIntervalCounter = 0; 4994static int mallocDebugCounter = 0; 4995bool os::check_heap(bool force) { 4996 if (++mallocDebugCounter < MallocVerifyStart && !force) return true; 4997 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) { 4998 // Note: HeapValidate executes two hardware breakpoints when it finds something 4999 // wrong; at these points, eax contains the address of the offending block (I think). 5000 // To get to the exlicit error message(s) below, just continue twice. 5001 HANDLE heap = GetProcessHeap(); 5002 5003 // If we fail to lock the heap, then gflags.exe has been used 5004 // or some other special heap flag has been set that prevents 5005 // locking. We don't try to walk a heap we can't lock. 5006 if (HeapLock(heap) != 0) { 5007 PROCESS_HEAP_ENTRY phe; 5008 phe.lpData = NULL; 5009 while (HeapWalk(heap, &phe) != 0) { 5010 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) && 5011 !HeapValidate(heap, 0, phe.lpData)) { 5012 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter); 5013 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData); 5014 fatal("corrupted C heap"); 5015 } 5016 } 5017 DWORD err = GetLastError(); 5018 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) { 5019 fatal(err_msg("heap walk aborted with error %d", err)); 5020 } 5021 HeapUnlock(heap); 5022 } 5023 mallocDebugIntervalCounter = 0; 5024 } 5025 return true; 5026} 5027 5028 5029bool os::find(address addr, outputStream* st) { 5030 // Nothing yet 5031 return false; 5032} 5033 5034LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) { 5035 DWORD exception_code = e->ExceptionRecord->ExceptionCode; 5036 5037 if (exception_code == EXCEPTION_ACCESS_VIOLATION) { 5038 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow(); 5039 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord; 5040 address addr = (address) exceptionRecord->ExceptionInformation[1]; 5041 5042 if (os::is_memory_serialize_page(thread, addr)) 5043 return EXCEPTION_CONTINUE_EXECUTION; 5044 } 5045 5046 return EXCEPTION_CONTINUE_SEARCH; 5047} 5048 5049// We don't build a headless jre for Windows 5050bool os::is_headless_jre() { return false; } 5051 5052static jint initSock() { 5053 WSADATA wsadata; 5054 5055 if (!os::WinSock2Dll::WinSock2Available()) { 5056 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n", 5057 ::GetLastError()); 5058 return JNI_ERR; 5059 } 5060 5061 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) { 5062 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n", 5063 ::GetLastError()); 5064 return JNI_ERR; 5065 } 5066 return JNI_OK; 5067} 5068 5069struct hostent* os::get_host_by_name(char* name) { 5070 return (struct hostent*)os::WinSock2Dll::gethostbyname(name); 5071} 5072 5073int os::socket_close(int fd) { 5074 return ::closesocket(fd); 5075} 5076 5077int os::socket_available(int fd, jint *pbytes) { 5078 int ret = ::ioctlsocket(fd, FIONREAD, (u_long*)pbytes); 5079 return (ret < 0) ? 0 : 1; 5080} 5081 5082int os::socket(int domain, int type, int protocol) { 5083 return ::socket(domain, type, protocol); 5084} 5085 5086int os::listen(int fd, int count) { 5087 return ::listen(fd, count); 5088} 5089 5090int os::connect(int fd, struct sockaddr* him, socklen_t len) { 5091 return ::connect(fd, him, len); 5092} 5093 5094int os::accept(int fd, struct sockaddr* him, socklen_t* len) { 5095 return ::accept(fd, him, len); 5096} 5097 5098int os::sendto(int fd, char* buf, size_t len, uint flags, 5099 struct sockaddr* to, socklen_t tolen) { 5100 5101 return ::sendto(fd, buf, (int)len, flags, to, tolen); 5102} 5103 5104int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags, 5105 sockaddr* from, socklen_t* fromlen) { 5106 5107 return ::recvfrom(fd, buf, (int)nBytes, flags, from, fromlen); 5108} 5109 5110int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5111 return ::recv(fd, buf, (int)nBytes, flags); 5112} 5113 5114int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5115 return ::send(fd, buf, (int)nBytes, flags); 5116} 5117 5118int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5119 return ::send(fd, buf, (int)nBytes, flags); 5120} 5121 5122int os::timeout(int fd, long timeout) { 5123 fd_set tbl; 5124 struct timeval t; 5125 5126 t.tv_sec = timeout / 1000; 5127 t.tv_usec = (timeout % 1000) * 1000; 5128 5129 tbl.fd_count = 1; 5130 tbl.fd_array[0] = fd; 5131 5132 return ::select(1, &tbl, 0, 0, &t); 5133} 5134 5135int os::get_host_name(char* name, int namelen) { 5136 return ::gethostname(name, namelen); 5137} 5138 5139int os::socket_shutdown(int fd, int howto) { 5140 return ::shutdown(fd, howto); 5141} 5142 5143int os::bind(int fd, struct sockaddr* him, socklen_t len) { 5144 return ::bind(fd, him, len); 5145} 5146 5147int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) { 5148 return ::getsockname(fd, him, len); 5149} 5150 5151int os::get_sock_opt(int fd, int level, int optname, 5152 char* optval, socklen_t* optlen) { 5153 return ::getsockopt(fd, level, optname, optval, optlen); 5154} 5155 5156int os::set_sock_opt(int fd, int level, int optname, 5157 const char* optval, socklen_t optlen) { 5158 return ::setsockopt(fd, level, optname, optval, optlen); 5159} 5160 5161// WINDOWS CONTEXT Flags for THREAD_SAMPLING 5162#if defined(IA32) 5163# define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS) 5164#elif defined (AMD64) 5165# define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT) 5166#endif 5167 5168// returns true if thread could be suspended, 5169// false otherwise 5170static bool do_suspend(HANDLE* h) { 5171 if (h != NULL) { 5172 if (SuspendThread(*h) != ~0) { 5173 return true; 5174 } 5175 } 5176 return false; 5177} 5178 5179// resume the thread 5180// calling resume on an active thread is a no-op 5181static void do_resume(HANDLE* h) { 5182 if (h != NULL) { 5183 ResumeThread(*h); 5184 } 5185} 5186 5187// retrieve a suspend/resume context capable handle 5188// from the tid. Caller validates handle return value. 5189void get_thread_handle_for_extended_context(HANDLE* h, OSThread::thread_id_t tid) { 5190 if (h != NULL) { 5191 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid); 5192 } 5193} 5194 5195// 5196// Thread sampling implementation 5197// 5198void os::SuspendedThreadTask::internal_do_task() { 5199 CONTEXT ctxt; 5200 HANDLE h = NULL; 5201 5202 // get context capable handle for thread 5203 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id()); 5204 5205 // sanity 5206 if (h == NULL || h == INVALID_HANDLE_VALUE) { 5207 return; 5208 } 5209 5210 // suspend the thread 5211 if (do_suspend(&h)) { 5212 ctxt.ContextFlags = sampling_context_flags; 5213 // get thread context 5214 GetThreadContext(h, &ctxt); 5215 SuspendedThreadTaskContext context(_thread, &ctxt); 5216 // pass context to Thread Sampling impl 5217 do_task(context); 5218 // resume thread 5219 do_resume(&h); 5220 } 5221 5222 // close handle 5223 CloseHandle(h); 5224} 5225 5226 5227// Kernel32 API 5228typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void); 5229typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD); 5230typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG); 5231typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG); 5232typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG); 5233 5234GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL; 5235VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL; 5236GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL; 5237GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL; 5238RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL; 5239 5240 5241BOOL os::Kernel32Dll::initialized = FALSE; 5242SIZE_T os::Kernel32Dll::GetLargePageMinimum() { 5243 assert(initialized && _GetLargePageMinimum != NULL, 5244 "GetLargePageMinimumAvailable() not yet called"); 5245 return _GetLargePageMinimum(); 5246} 5247 5248BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() { 5249 if (!initialized) { 5250 initialize(); 5251 } 5252 return _GetLargePageMinimum != NULL; 5253} 5254 5255BOOL os::Kernel32Dll::NumaCallsAvailable() { 5256 if (!initialized) { 5257 initialize(); 5258 } 5259 return _VirtualAllocExNuma != NULL; 5260} 5261 5262LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) { 5263 assert(initialized && _VirtualAllocExNuma != NULL, 5264 "NUMACallsAvailable() not yet called"); 5265 5266 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node); 5267} 5268 5269BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) { 5270 assert(initialized && _GetNumaHighestNodeNumber != NULL, 5271 "NUMACallsAvailable() not yet called"); 5272 5273 return _GetNumaHighestNodeNumber(ptr_highest_node_number); 5274} 5275 5276BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) { 5277 assert(initialized && _GetNumaNodeProcessorMask != NULL, 5278 "NUMACallsAvailable() not yet called"); 5279 5280 return _GetNumaNodeProcessorMask(node, proc_mask); 5281} 5282 5283USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip, 5284 ULONG FrameToCapture, PVOID* BackTrace, PULONG BackTraceHash) { 5285 if (!initialized) { 5286 initialize(); 5287 } 5288 5289 if (_RtlCaptureStackBackTrace != NULL) { 5290 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture, 5291 BackTrace, BackTraceHash); 5292 } else { 5293 return 0; 5294 } 5295} 5296 5297void os::Kernel32Dll::initializeCommon() { 5298 if (!initialized) { 5299 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5300 assert(handle != NULL, "Just check"); 5301 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum"); 5302 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma"); 5303 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber"); 5304 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask"); 5305 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace"); 5306 initialized = TRUE; 5307 } 5308} 5309 5310 5311 5312#ifndef JDK6_OR_EARLIER 5313 5314void os::Kernel32Dll::initialize() { 5315 initializeCommon(); 5316} 5317 5318 5319// Kernel32 API 5320inline BOOL os::Kernel32Dll::SwitchToThread() { 5321 return ::SwitchToThread(); 5322} 5323 5324inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5325 return true; 5326} 5327 5328 // Help tools 5329inline BOOL os::Kernel32Dll::HelpToolsAvailable() { 5330 return true; 5331} 5332 5333inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) { 5334 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5335} 5336 5337inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5338 return ::Module32First(hSnapshot, lpme); 5339} 5340 5341inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5342 return ::Module32Next(hSnapshot, lpme); 5343} 5344 5345 5346inline BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() { 5347 return true; 5348} 5349 5350inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5351 ::GetNativeSystemInfo(lpSystemInfo); 5352} 5353 5354// PSAPI API 5355inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) { 5356 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5357} 5358 5359inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) { 5360 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5361} 5362 5363inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) { 5364 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5365} 5366 5367inline BOOL os::PSApiDll::PSApiAvailable() { 5368 return true; 5369} 5370 5371 5372// WinSock2 API 5373inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) { 5374 return ::WSAStartup(wVersionRequested, lpWSAData); 5375} 5376 5377inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5378 return ::gethostbyname(name); 5379} 5380 5381inline BOOL os::WinSock2Dll::WinSock2Available() { 5382 return true; 5383} 5384 5385// Advapi API 5386inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5387 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength, 5388 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) { 5389 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5390 BufferLength, PreviousState, ReturnLength); 5391} 5392 5393inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess, 5394 PHANDLE TokenHandle) { 5395 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5396} 5397 5398inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) { 5399 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5400} 5401 5402inline BOOL os::Advapi32Dll::AdvapiAvailable() { 5403 return true; 5404} 5405 5406void* os::get_default_process_handle() { 5407 return (void*)GetModuleHandle(NULL); 5408} 5409 5410// Builds a platform dependent Agent_OnLoad_<lib_name> function name 5411// which is used to find statically linked in agents. 5412// Additionally for windows, takes into account __stdcall names. 5413// Parameters: 5414// sym_name: Symbol in library we are looking for 5415// lib_name: Name of library to look in, NULL for shared libs. 5416// is_absolute_path == true if lib_name is absolute path to agent 5417// such as "C:/a/b/L.dll" 5418// == false if only the base name of the library is passed in 5419// such as "L" 5420char* os::build_agent_function_name(const char *sym_name, const char *lib_name, 5421 bool is_absolute_path) { 5422 char *agent_entry_name; 5423 size_t len; 5424 size_t name_len; 5425 size_t prefix_len = strlen(JNI_LIB_PREFIX); 5426 size_t suffix_len = strlen(JNI_LIB_SUFFIX); 5427 const char *start; 5428 5429 if (lib_name != NULL) { 5430 len = name_len = strlen(lib_name); 5431 if (is_absolute_path) { 5432 // Need to strip path, prefix and suffix 5433 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { 5434 lib_name = ++start; 5435 } else { 5436 // Need to check for drive prefix 5437 if ((start = strchr(lib_name, ':')) != NULL) { 5438 lib_name = ++start; 5439 } 5440 } 5441 if (len <= (prefix_len + suffix_len)) { 5442 return NULL; 5443 } 5444 lib_name += prefix_len; 5445 name_len = strlen(lib_name) - suffix_len; 5446 } 5447 } 5448 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; 5449 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); 5450 if (agent_entry_name == NULL) { 5451 return NULL; 5452 } 5453 if (lib_name != NULL) { 5454 const char *p = strrchr(sym_name, '@'); 5455 if (p != NULL && p != sym_name) { 5456 // sym_name == _Agent_OnLoad@XX 5457 strncpy(agent_entry_name, sym_name, (p - sym_name)); 5458 agent_entry_name[(p-sym_name)] = '\0'; 5459 // agent_entry_name == _Agent_OnLoad 5460 strcat(agent_entry_name, "_"); 5461 strncat(agent_entry_name, lib_name, name_len); 5462 strcat(agent_entry_name, p); 5463 // agent_entry_name == _Agent_OnLoad_lib_name@XX 5464 } else { 5465 strcpy(agent_entry_name, sym_name); 5466 strcat(agent_entry_name, "_"); 5467 strncat(agent_entry_name, lib_name, name_len); 5468 } 5469 } else { 5470 strcpy(agent_entry_name, sym_name); 5471 } 5472 return agent_entry_name; 5473} 5474 5475#else 5476// Kernel32 API 5477typedef BOOL (WINAPI* SwitchToThread_Fn)(void); 5478typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD); 5479typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32); 5480typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32); 5481typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO); 5482 5483SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL; 5484CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL; 5485Module32First_Fn os::Kernel32Dll::_Module32First = NULL; 5486Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL; 5487GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL; 5488 5489void os::Kernel32Dll::initialize() { 5490 if (!initialized) { 5491 HMODULE handle = ::GetModuleHandle("Kernel32.dll"); 5492 assert(handle != NULL, "Just check"); 5493 5494 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread"); 5495 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn) 5496 ::GetProcAddress(handle, "CreateToolhelp32Snapshot"); 5497 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First"); 5498 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next"); 5499 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo"); 5500 initializeCommon(); // resolve the functions that always need resolving 5501 5502 initialized = TRUE; 5503 } 5504} 5505 5506BOOL os::Kernel32Dll::SwitchToThread() { 5507 assert(initialized && _SwitchToThread != NULL, 5508 "SwitchToThreadAvailable() not yet called"); 5509 return _SwitchToThread(); 5510} 5511 5512 5513BOOL os::Kernel32Dll::SwitchToThreadAvailable() { 5514 if (!initialized) { 5515 initialize(); 5516 } 5517 return _SwitchToThread != NULL; 5518} 5519 5520// Help tools 5521BOOL os::Kernel32Dll::HelpToolsAvailable() { 5522 if (!initialized) { 5523 initialize(); 5524 } 5525 return _CreateToolhelp32Snapshot != NULL && 5526 _Module32First != NULL && 5527 _Module32Next != NULL; 5528} 5529 5530HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) { 5531 assert(initialized && _CreateToolhelp32Snapshot != NULL, 5532 "HelpToolsAvailable() not yet called"); 5533 5534 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId); 5535} 5536 5537BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5538 assert(initialized && _Module32First != NULL, 5539 "HelpToolsAvailable() not yet called"); 5540 5541 return _Module32First(hSnapshot, lpme); 5542} 5543 5544inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) { 5545 assert(initialized && _Module32Next != NULL, 5546 "HelpToolsAvailable() not yet called"); 5547 5548 return _Module32Next(hSnapshot, lpme); 5549} 5550 5551 5552BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() { 5553 if (!initialized) { 5554 initialize(); 5555 } 5556 return _GetNativeSystemInfo != NULL; 5557} 5558 5559void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) { 5560 assert(initialized && _GetNativeSystemInfo != NULL, 5561 "GetNativeSystemInfoAvailable() not yet called"); 5562 5563 _GetNativeSystemInfo(lpSystemInfo); 5564} 5565 5566// PSAPI API 5567 5568 5569typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD); 5570typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);; 5571typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD); 5572 5573EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL; 5574GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL; 5575GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL; 5576BOOL os::PSApiDll::initialized = FALSE; 5577 5578void os::PSApiDll::initialize() { 5579 if (!initialized) { 5580 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0); 5581 if (handle != NULL) { 5582 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle, 5583 "EnumProcessModules"); 5584 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle, 5585 "GetModuleFileNameExA"); 5586 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle, 5587 "GetModuleInformation"); 5588 } 5589 initialized = TRUE; 5590 } 5591} 5592 5593 5594 5595BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) { 5596 assert(initialized && _EnumProcessModules != NULL, 5597 "PSApiAvailable() not yet called"); 5598 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded); 5599} 5600 5601DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) { 5602 assert(initialized && _GetModuleFileNameEx != NULL, 5603 "PSApiAvailable() not yet called"); 5604 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize); 5605} 5606 5607BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) { 5608 assert(initialized && _GetModuleInformation != NULL, 5609 "PSApiAvailable() not yet called"); 5610 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb); 5611} 5612 5613BOOL os::PSApiDll::PSApiAvailable() { 5614 if (!initialized) { 5615 initialize(); 5616 } 5617 return _EnumProcessModules != NULL && 5618 _GetModuleFileNameEx != NULL && 5619 _GetModuleInformation != NULL; 5620} 5621 5622 5623// WinSock2 API 5624typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA); 5625typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...); 5626 5627WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL; 5628gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL; 5629BOOL os::WinSock2Dll::initialized = FALSE; 5630 5631void os::WinSock2Dll::initialize() { 5632 if (!initialized) { 5633 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0); 5634 if (handle != NULL) { 5635 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup"); 5636 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname"); 5637 } 5638 initialized = TRUE; 5639 } 5640} 5641 5642 5643BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) { 5644 assert(initialized && _WSAStartup != NULL, 5645 "WinSock2Available() not yet called"); 5646 return _WSAStartup(wVersionRequested, lpWSAData); 5647} 5648 5649struct hostent* os::WinSock2Dll::gethostbyname(const char *name) { 5650 assert(initialized && _gethostbyname != NULL, 5651 "WinSock2Available() not yet called"); 5652 return _gethostbyname(name); 5653} 5654 5655BOOL os::WinSock2Dll::WinSock2Available() { 5656 if (!initialized) { 5657 initialize(); 5658 } 5659 return _WSAStartup != NULL && 5660 _gethostbyname != NULL; 5661} 5662 5663typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD); 5664typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE); 5665typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID); 5666 5667AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL; 5668OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL; 5669LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL; 5670BOOL os::Advapi32Dll::initialized = FALSE; 5671 5672void os::Advapi32Dll::initialize() { 5673 if (!initialized) { 5674 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0); 5675 if (handle != NULL) { 5676 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle, 5677 "AdjustTokenPrivileges"); 5678 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle, 5679 "OpenProcessToken"); 5680 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle, 5681 "LookupPrivilegeValueA"); 5682 } 5683 initialized = TRUE; 5684 } 5685} 5686 5687BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle, 5688 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength, 5689 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) { 5690 assert(initialized && _AdjustTokenPrivileges != NULL, 5691 "AdvapiAvailable() not yet called"); 5692 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState, 5693 BufferLength, PreviousState, ReturnLength); 5694} 5695 5696BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess, 5697 PHANDLE TokenHandle) { 5698 assert(initialized && _OpenProcessToken != NULL, 5699 "AdvapiAvailable() not yet called"); 5700 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle); 5701} 5702 5703BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) { 5704 assert(initialized && _LookupPrivilegeValue != NULL, 5705 "AdvapiAvailable() not yet called"); 5706 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid); 5707} 5708 5709BOOL os::Advapi32Dll::AdvapiAvailable() { 5710 if (!initialized) { 5711 initialize(); 5712 } 5713 return _AdjustTokenPrivileges != NULL && 5714 _OpenProcessToken != NULL && 5715 _LookupPrivilegeValue != NULL; 5716} 5717 5718#endif 5719 5720#ifndef PRODUCT 5721 5722// test the code path in reserve_memory_special() that tries to allocate memory in a single 5723// contiguous memory block at a particular address. 5724// The test first tries to find a good approximate address to allocate at by using the same 5725// method to allocate some memory at any address. The test then tries to allocate memory in 5726// the vicinity (not directly after it to avoid possible by-chance use of that location) 5727// This is of course only some dodgy assumption, there is no guarantee that the vicinity of 5728// the previously allocated memory is available for allocation. The only actual failure 5729// that is reported is when the test tries to allocate at a particular location but gets a 5730// different valid one. A NULL return value at this point is not considered an error but may 5731// be legitimate. 5732// If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages. 5733void TestReserveMemorySpecial_test() { 5734 if (!UseLargePages) { 5735 if (VerboseInternalVMTests) { 5736 gclog_or_tty->print("Skipping test because large pages are disabled"); 5737 } 5738 return; 5739 } 5740 // save current value of globals 5741 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; 5742 bool old_use_numa_interleaving = UseNUMAInterleaving; 5743 5744 // set globals to make sure we hit the correct code path 5745 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; 5746 5747 // do an allocation at an address selected by the OS to get a good one. 5748 const size_t large_allocation_size = os::large_page_size() * 4; 5749 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); 5750 if (result == NULL) { 5751 if (VerboseInternalVMTests) { 5752 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.", 5753 large_allocation_size); 5754 } 5755 } else { 5756 os::release_memory_special(result, large_allocation_size); 5757 5758 // allocate another page within the recently allocated memory area which seems to be a good location. At least 5759 // we managed to get it once. 5760 const size_t expected_allocation_size = os::large_page_size(); 5761 char* expected_location = result + os::large_page_size(); 5762 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); 5763 if (actual_location == NULL) { 5764 if (VerboseInternalVMTests) { 5765 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.", 5766 expected_location, large_allocation_size); 5767 } 5768 } else { 5769 // release memory 5770 os::release_memory_special(actual_location, expected_allocation_size); 5771 // only now check, after releasing any memory to avoid any leaks. 5772 assert(actual_location == expected_location, 5773 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead", 5774 expected_location, expected_allocation_size, actual_location)); 5775 } 5776 } 5777 5778 // restore globals 5779 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; 5780 UseNUMAInterleaving = old_use_numa_interleaving; 5781} 5782#endif // PRODUCT 5783 5784