Tue, 21 Apr 2009 16:12:51 -0400
6830069: UseLargePages is broken on Win64
Summary: Making VirtualAlloc/VirtualProtect two calls for PAGE_EXECUTE_READWRITE doesn't work for MEM_LARGE_PAGES.
Reviewed-by: xlu, kvn, jcoomes
1 /*
2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 #ifdef _WIN64
26 // Must be at least Windows 2000 or XP to use VectoredExceptions
27 #define _WIN32_WINNT 0x500
28 #endif
30 // do not include precompiled header file
31 # include "incls/_os_windows.cpp.incl"
33 #ifdef _DEBUG
34 #include <crtdbg.h>
35 #endif
38 #include <windows.h>
39 #include <sys/types.h>
40 #include <sys/stat.h>
41 #include <sys/timeb.h>
42 #include <objidl.h>
43 #include <shlobj.h>
45 #include <malloc.h>
46 #include <signal.h>
47 #include <direct.h>
48 #include <errno.h>
49 #include <fcntl.h>
50 #include <io.h>
51 #include <process.h> // For _beginthreadex(), _endthreadex()
52 #include <imagehlp.h> // For os::dll_address_to_function_name
54 /* for enumerating dll libraries */
55 #include <tlhelp32.h>
56 #include <vdmdbg.h>
58 // for timer info max values which include all bits
59 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
61 // For DLL loading/load error detection
62 // Values of PE COFF
63 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
64 #define IMAGE_FILE_SIGNATURE_LENGTH 4
66 static HANDLE main_process;
67 static HANDLE main_thread;
68 static int main_thread_id;
70 static FILETIME process_creation_time;
71 static FILETIME process_exit_time;
72 static FILETIME process_user_time;
73 static FILETIME process_kernel_time;
75 #ifdef _WIN64
76 PVOID topLevelVectoredExceptionHandler = NULL;
77 #endif
79 #ifdef _M_IA64
80 #define __CPU__ ia64
81 #elif _M_AMD64
82 #define __CPU__ amd64
83 #else
84 #define __CPU__ i486
85 #endif
87 // save DLL module handle, used by GetModuleFileName
89 HINSTANCE vm_lib_handle;
90 static int getLastErrorString(char *buf, size_t len);
92 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
93 switch (reason) {
94 case DLL_PROCESS_ATTACH:
95 vm_lib_handle = hinst;
96 if(ForceTimeHighResolution)
97 timeBeginPeriod(1L);
98 break;
99 case DLL_PROCESS_DETACH:
100 if(ForceTimeHighResolution)
101 timeEndPeriod(1L);
102 #ifdef _WIN64
103 if (topLevelVectoredExceptionHandler != NULL) {
104 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler);
105 topLevelVectoredExceptionHandler = NULL;
106 }
107 #endif
108 break;
109 default:
110 break;
111 }
112 return true;
113 }
115 static inline double fileTimeAsDouble(FILETIME* time) {
116 const double high = (double) ((unsigned int) ~0);
117 const double split = 10000000.0;
118 double result = (time->dwLowDateTime / split) +
119 time->dwHighDateTime * (high/split);
120 return result;
121 }
123 // Implementation of os
125 bool os::getenv(const char* name, char* buffer, int len) {
126 int result = GetEnvironmentVariable(name, buffer, len);
127 return result > 0 && result < len;
128 }
131 // No setuid programs under Windows.
132 bool os::have_special_privileges() {
133 return false;
134 }
137 // This method is a periodic task to check for misbehaving JNI applications
138 // under CheckJNI, we can add any periodic checks here.
139 // For Windows at the moment does nothing
140 void os::run_periodic_checks() {
141 return;
142 }
144 #ifndef _WIN64
145 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
146 #endif
147 void os::init_system_properties_values() {
148 /* sysclasspath, java_home, dll_dir */
149 {
150 char *home_path;
151 char *dll_path;
152 char *pslash;
153 char *bin = "\\bin";
154 char home_dir[MAX_PATH];
156 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
157 os::jvm_path(home_dir, sizeof(home_dir));
158 // Found the full path to jvm[_g].dll.
159 // Now cut the path to <java_home>/jre if we can.
160 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
161 pslash = strrchr(home_dir, '\\');
162 if (pslash != NULL) {
163 *pslash = '\0'; /* get rid of \{client|server} */
164 pslash = strrchr(home_dir, '\\');
165 if (pslash != NULL)
166 *pslash = '\0'; /* get rid of \bin */
167 }
168 }
170 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1);
171 if (home_path == NULL)
172 return;
173 strcpy(home_path, home_dir);
174 Arguments::set_java_home(home_path);
176 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1);
177 if (dll_path == NULL)
178 return;
179 strcpy(dll_path, home_dir);
180 strcat(dll_path, bin);
181 Arguments::set_dll_dir(dll_path);
183 if (!set_boot_path('\\', ';'))
184 return;
185 }
187 /* library_path */
188 #define EXT_DIR "\\lib\\ext"
189 #define BIN_DIR "\\bin"
190 #define PACKAGE_DIR "\\Sun\\Java"
191 {
192 /* Win32 library search order (See the documentation for LoadLibrary):
193 *
194 * 1. The directory from which application is loaded.
195 * 2. The current directory
196 * 3. The system wide Java Extensions directory (Java only)
197 * 4. System directory (GetSystemDirectory)
198 * 5. Windows directory (GetWindowsDirectory)
199 * 6. The PATH environment variable
200 */
202 char *library_path;
203 char tmp[MAX_PATH];
204 char *path_str = ::getenv("PATH");
206 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
207 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10);
209 library_path[0] = '\0';
211 GetModuleFileName(NULL, tmp, sizeof(tmp));
212 *(strrchr(tmp, '\\')) = '\0';
213 strcat(library_path, tmp);
215 strcat(library_path, ";.");
217 GetWindowsDirectory(tmp, sizeof(tmp));
218 strcat(library_path, ";");
219 strcat(library_path, tmp);
220 strcat(library_path, PACKAGE_DIR BIN_DIR);
222 GetSystemDirectory(tmp, sizeof(tmp));
223 strcat(library_path, ";");
224 strcat(library_path, tmp);
226 GetWindowsDirectory(tmp, sizeof(tmp));
227 strcat(library_path, ";");
228 strcat(library_path, tmp);
230 if (path_str) {
231 strcat(library_path, ";");
232 strcat(library_path, path_str);
233 }
235 Arguments::set_library_path(library_path);
236 FREE_C_HEAP_ARRAY(char, library_path);
237 }
239 /* Default extensions directory */
240 {
241 char path[MAX_PATH];
242 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
243 GetWindowsDirectory(path, MAX_PATH);
244 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
245 path, PACKAGE_DIR, EXT_DIR);
246 Arguments::set_ext_dirs(buf);
247 }
248 #undef EXT_DIR
249 #undef BIN_DIR
250 #undef PACKAGE_DIR
252 /* Default endorsed standards directory. */
253 {
254 #define ENDORSED_DIR "\\lib\\endorsed"
255 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
256 char * buf = NEW_C_HEAP_ARRAY(char, len);
257 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
258 Arguments::set_endorsed_dirs(buf);
259 #undef ENDORSED_DIR
260 }
262 #ifndef _WIN64
263 SetUnhandledExceptionFilter(Handle_FLT_Exception);
264 #endif
266 // Done
267 return;
268 }
270 void os::breakpoint() {
271 DebugBreak();
272 }
274 // Invoked from the BREAKPOINT Macro
275 extern "C" void breakpoint() {
276 os::breakpoint();
277 }
279 // Returns an estimate of the current stack pointer. Result must be guaranteed
280 // to point into the calling threads stack, and be no lower than the current
281 // stack pointer.
283 address os::current_stack_pointer() {
284 int dummy;
285 address sp = (address)&dummy;
286 return sp;
287 }
289 // os::current_stack_base()
290 //
291 // Returns the base of the stack, which is the stack's
292 // starting address. This function must be called
293 // while running on the stack of the thread being queried.
295 address os::current_stack_base() {
296 MEMORY_BASIC_INFORMATION minfo;
297 address stack_bottom;
298 size_t stack_size;
300 VirtualQuery(&minfo, &minfo, sizeof(minfo));
301 stack_bottom = (address)minfo.AllocationBase;
302 stack_size = minfo.RegionSize;
304 // Add up the sizes of all the regions with the same
305 // AllocationBase.
306 while( 1 )
307 {
308 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
309 if ( stack_bottom == (address)minfo.AllocationBase )
310 stack_size += minfo.RegionSize;
311 else
312 break;
313 }
315 #ifdef _M_IA64
316 // IA64 has memory and register stacks
317 stack_size = stack_size / 2;
318 #endif
319 return stack_bottom + stack_size;
320 }
322 size_t os::current_stack_size() {
323 size_t sz;
324 MEMORY_BASIC_INFORMATION minfo;
325 VirtualQuery(&minfo, &minfo, sizeof(minfo));
326 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
327 return sz;
328 }
330 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
331 const struct tm* time_struct_ptr = localtime(clock);
332 if (time_struct_ptr != NULL) {
333 *res = *time_struct_ptr;
334 return res;
335 }
336 return NULL;
337 }
339 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
341 // Thread start routine for all new Java threads
342 static unsigned __stdcall java_start(Thread* thread) {
343 // Try to randomize the cache line index of hot stack frames.
344 // This helps when threads of the same stack traces evict each other's
345 // cache lines. The threads can be either from the same JVM instance, or
346 // from different JVM instances. The benefit is especially true for
347 // processors with hyperthreading technology.
348 static int counter = 0;
349 int pid = os::current_process_id();
350 _alloca(((pid ^ counter++) & 7) * 128);
352 OSThread* osthr = thread->osthread();
353 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
355 if (UseNUMA) {
356 int lgrp_id = os::numa_get_group_id();
357 if (lgrp_id != -1) {
358 thread->set_lgrp_id(lgrp_id);
359 }
360 }
363 if (UseVectoredExceptions) {
364 // If we are using vectored exception we don't need to set a SEH
365 thread->run();
366 }
367 else {
368 // Install a win32 structured exception handler around every thread created
369 // by VM, so VM can genrate error dump when an exception occurred in non-
370 // Java thread (e.g. VM thread).
371 __try {
372 thread->run();
373 } __except(topLevelExceptionFilter(
374 (_EXCEPTION_POINTERS*)_exception_info())) {
375 // Nothing to do.
376 }
377 }
379 // One less thread is executing
380 // When the VMThread gets here, the main thread may have already exited
381 // which frees the CodeHeap containing the Atomic::add code
382 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
383 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
384 }
386 return 0;
387 }
389 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
390 // Allocate the OSThread object
391 OSThread* osthread = new OSThread(NULL, NULL);
392 if (osthread == NULL) return NULL;
394 // Initialize support for Java interrupts
395 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
396 if (interrupt_event == NULL) {
397 delete osthread;
398 return NULL;
399 }
400 osthread->set_interrupt_event(interrupt_event);
402 // Store info on the Win32 thread into the OSThread
403 osthread->set_thread_handle(thread_handle);
404 osthread->set_thread_id(thread_id);
406 if (UseNUMA) {
407 int lgrp_id = os::numa_get_group_id();
408 if (lgrp_id != -1) {
409 thread->set_lgrp_id(lgrp_id);
410 }
411 }
413 // Initial thread state is INITIALIZED, not SUSPENDED
414 osthread->set_state(INITIALIZED);
416 return osthread;
417 }
420 bool os::create_attached_thread(JavaThread* thread) {
421 #ifdef ASSERT
422 thread->verify_not_published();
423 #endif
424 HANDLE thread_h;
425 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
426 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
427 fatal("DuplicateHandle failed\n");
428 }
429 OSThread* osthread = create_os_thread(thread, thread_h,
430 (int)current_thread_id());
431 if (osthread == NULL) {
432 return false;
433 }
435 // Initial thread state is RUNNABLE
436 osthread->set_state(RUNNABLE);
438 thread->set_osthread(osthread);
439 return true;
440 }
442 bool os::create_main_thread(JavaThread* thread) {
443 #ifdef ASSERT
444 thread->verify_not_published();
445 #endif
446 if (_starting_thread == NULL) {
447 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
448 if (_starting_thread == NULL) {
449 return false;
450 }
451 }
453 // The primordial thread is runnable from the start)
454 _starting_thread->set_state(RUNNABLE);
456 thread->set_osthread(_starting_thread);
457 return true;
458 }
460 // Allocate and initialize a new OSThread
461 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
462 unsigned thread_id;
464 // Allocate the OSThread object
465 OSThread* osthread = new OSThread(NULL, NULL);
466 if (osthread == NULL) {
467 return false;
468 }
470 // Initialize support for Java interrupts
471 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
472 if (interrupt_event == NULL) {
473 delete osthread;
474 return NULL;
475 }
476 osthread->set_interrupt_event(interrupt_event);
477 osthread->set_interrupted(false);
479 thread->set_osthread(osthread);
481 if (stack_size == 0) {
482 switch (thr_type) {
483 case os::java_thread:
484 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
485 if (JavaThread::stack_size_at_create() > 0)
486 stack_size = JavaThread::stack_size_at_create();
487 break;
488 case os::compiler_thread:
489 if (CompilerThreadStackSize > 0) {
490 stack_size = (size_t)(CompilerThreadStackSize * K);
491 break;
492 } // else fall through:
493 // use VMThreadStackSize if CompilerThreadStackSize is not defined
494 case os::vm_thread:
495 case os::pgc_thread:
496 case os::cgc_thread:
497 case os::watcher_thread:
498 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
499 break;
500 }
501 }
503 // Create the Win32 thread
504 //
505 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
506 // does not specify stack size. Instead, it specifies the size of
507 // initially committed space. The stack size is determined by
508 // PE header in the executable. If the committed "stack_size" is larger
509 // than default value in the PE header, the stack is rounded up to the
510 // nearest multiple of 1MB. For example if the launcher has default
511 // stack size of 320k, specifying any size less than 320k does not
512 // affect the actual stack size at all, it only affects the initial
513 // commitment. On the other hand, specifying 'stack_size' larger than
514 // default value may cause significant increase in memory usage, because
515 // not only the stack space will be rounded up to MB, but also the
516 // entire space is committed upfront.
517 //
518 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
519 // for CreateThread() that can treat 'stack_size' as stack size. However we
520 // are not supposed to call CreateThread() directly according to MSDN
521 // document because JVM uses C runtime library. The good news is that the
522 // flag appears to work with _beginthredex() as well.
524 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
525 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
526 #endif
528 HANDLE thread_handle =
529 (HANDLE)_beginthreadex(NULL,
530 (unsigned)stack_size,
531 (unsigned (__stdcall *)(void*)) java_start,
532 thread,
533 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
534 &thread_id);
535 if (thread_handle == NULL) {
536 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
537 // without the flag.
538 thread_handle =
539 (HANDLE)_beginthreadex(NULL,
540 (unsigned)stack_size,
541 (unsigned (__stdcall *)(void*)) java_start,
542 thread,
543 CREATE_SUSPENDED,
544 &thread_id);
545 }
546 if (thread_handle == NULL) {
547 // Need to clean up stuff we've allocated so far
548 CloseHandle(osthread->interrupt_event());
549 thread->set_osthread(NULL);
550 delete osthread;
551 return NULL;
552 }
554 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
556 // Store info on the Win32 thread into the OSThread
557 osthread->set_thread_handle(thread_handle);
558 osthread->set_thread_id(thread_id);
560 // Initial thread state is INITIALIZED, not SUSPENDED
561 osthread->set_state(INITIALIZED);
563 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
564 return true;
565 }
568 // Free Win32 resources related to the OSThread
569 void os::free_thread(OSThread* osthread) {
570 assert(osthread != NULL, "osthread not set");
571 CloseHandle(osthread->thread_handle());
572 CloseHandle(osthread->interrupt_event());
573 delete osthread;
574 }
577 static int has_performance_count = 0;
578 static jlong first_filetime;
579 static jlong initial_performance_count;
580 static jlong performance_frequency;
583 jlong as_long(LARGE_INTEGER x) {
584 jlong result = 0; // initialization to avoid warning
585 set_high(&result, x.HighPart);
586 set_low(&result, x.LowPart);
587 return result;
588 }
591 jlong os::elapsed_counter() {
592 LARGE_INTEGER count;
593 if (has_performance_count) {
594 QueryPerformanceCounter(&count);
595 return as_long(count) - initial_performance_count;
596 } else {
597 FILETIME wt;
598 GetSystemTimeAsFileTime(&wt);
599 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
600 }
601 }
604 jlong os::elapsed_frequency() {
605 if (has_performance_count) {
606 return performance_frequency;
607 } else {
608 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
609 return 10000000;
610 }
611 }
614 julong os::available_memory() {
615 return win32::available_memory();
616 }
618 julong os::win32::available_memory() {
619 // FIXME: GlobalMemoryStatus() may return incorrect value if total memory
620 // is larger than 4GB
621 MEMORYSTATUS ms;
622 GlobalMemoryStatus(&ms);
624 return (julong)ms.dwAvailPhys;
625 }
627 julong os::physical_memory() {
628 return win32::physical_memory();
629 }
631 julong os::allocatable_physical_memory(julong size) {
632 #ifdef _LP64
633 return size;
634 #else
635 // Limit to 1400m because of the 2gb address space wall
636 return MIN2(size, (julong)1400*M);
637 #endif
638 }
640 // VC6 lacks DWORD_PTR
641 #if _MSC_VER < 1300
642 typedef UINT_PTR DWORD_PTR;
643 #endif
645 int os::active_processor_count() {
646 DWORD_PTR lpProcessAffinityMask = 0;
647 DWORD_PTR lpSystemAffinityMask = 0;
648 int proc_count = processor_count();
649 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
650 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
651 // Nof active processors is number of bits in process affinity mask
652 int bitcount = 0;
653 while (lpProcessAffinityMask != 0) {
654 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
655 bitcount++;
656 }
657 return bitcount;
658 } else {
659 return proc_count;
660 }
661 }
663 bool os::distribute_processes(uint length, uint* distribution) {
664 // Not yet implemented.
665 return false;
666 }
668 bool os::bind_to_processor(uint processor_id) {
669 // Not yet implemented.
670 return false;
671 }
673 static void initialize_performance_counter() {
674 LARGE_INTEGER count;
675 if (QueryPerformanceFrequency(&count)) {
676 has_performance_count = 1;
677 performance_frequency = as_long(count);
678 QueryPerformanceCounter(&count);
679 initial_performance_count = as_long(count);
680 } else {
681 has_performance_count = 0;
682 FILETIME wt;
683 GetSystemTimeAsFileTime(&wt);
684 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
685 }
686 }
689 double os::elapsedTime() {
690 return (double) elapsed_counter() / (double) elapsed_frequency();
691 }
694 // Windows format:
695 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
696 // Java format:
697 // Java standards require the number of milliseconds since 1/1/1970
699 // Constant offset - calculated using offset()
700 static jlong _offset = 116444736000000000;
701 // Fake time counter for reproducible results when debugging
702 static jlong fake_time = 0;
704 #ifdef ASSERT
705 // Just to be safe, recalculate the offset in debug mode
706 static jlong _calculated_offset = 0;
707 static int _has_calculated_offset = 0;
709 jlong offset() {
710 if (_has_calculated_offset) return _calculated_offset;
711 SYSTEMTIME java_origin;
712 java_origin.wYear = 1970;
713 java_origin.wMonth = 1;
714 java_origin.wDayOfWeek = 0; // ignored
715 java_origin.wDay = 1;
716 java_origin.wHour = 0;
717 java_origin.wMinute = 0;
718 java_origin.wSecond = 0;
719 java_origin.wMilliseconds = 0;
720 FILETIME jot;
721 if (!SystemTimeToFileTime(&java_origin, &jot)) {
722 fatal1("Error = %d\nWindows error", GetLastError());
723 }
724 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
725 _has_calculated_offset = 1;
726 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
727 return _calculated_offset;
728 }
729 #else
730 jlong offset() {
731 return _offset;
732 }
733 #endif
735 jlong windows_to_java_time(FILETIME wt) {
736 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
737 return (a - offset()) / 10000;
738 }
740 FILETIME java_to_windows_time(jlong l) {
741 jlong a = (l * 10000) + offset();
742 FILETIME result;
743 result.dwHighDateTime = high(a);
744 result.dwLowDateTime = low(a);
745 return result;
746 }
748 // For now, we say that Windows does not support vtime. I have no idea
749 // whether it can actually be made to (DLD, 9/13/05).
751 bool os::supports_vtime() { return false; }
752 bool os::enable_vtime() { return false; }
753 bool os::vtime_enabled() { return false; }
754 double os::elapsedVTime() {
755 // better than nothing, but not much
756 return elapsedTime();
757 }
759 jlong os::javaTimeMillis() {
760 if (UseFakeTimers) {
761 return fake_time++;
762 } else {
763 FILETIME wt;
764 GetSystemTimeAsFileTime(&wt);
765 return windows_to_java_time(wt);
766 }
767 }
769 #define NANOS_PER_SEC CONST64(1000000000)
770 #define NANOS_PER_MILLISEC 1000000
771 jlong os::javaTimeNanos() {
772 if (!has_performance_count) {
773 return javaTimeMillis() * NANOS_PER_MILLISEC; // the best we can do.
774 } else {
775 LARGE_INTEGER current_count;
776 QueryPerformanceCounter(¤t_count);
777 double current = as_long(current_count);
778 double freq = performance_frequency;
779 jlong time = (jlong)((current/freq) * NANOS_PER_SEC);
780 return time;
781 }
782 }
784 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
785 if (!has_performance_count) {
786 // javaTimeMillis() doesn't have much percision,
787 // but it is not going to wrap -- so all 64 bits
788 info_ptr->max_value = ALL_64_BITS;
790 // this is a wall clock timer, so may skip
791 info_ptr->may_skip_backward = true;
792 info_ptr->may_skip_forward = true;
793 } else {
794 jlong freq = performance_frequency;
795 if (freq < NANOS_PER_SEC) {
796 // the performance counter is 64 bits and we will
797 // be multiplying it -- so no wrap in 64 bits
798 info_ptr->max_value = ALL_64_BITS;
799 } else if (freq > NANOS_PER_SEC) {
800 // use the max value the counter can reach to
801 // determine the max value which could be returned
802 julong max_counter = (julong)ALL_64_BITS;
803 info_ptr->max_value = (jlong)(max_counter / (freq / NANOS_PER_SEC));
804 } else {
805 // the performance counter is 64 bits and we will
806 // be using it directly -- so no wrap in 64 bits
807 info_ptr->max_value = ALL_64_BITS;
808 }
810 // using a counter, so no skipping
811 info_ptr->may_skip_backward = false;
812 info_ptr->may_skip_forward = false;
813 }
814 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
815 }
817 char* os::local_time_string(char *buf, size_t buflen) {
818 SYSTEMTIME st;
819 GetLocalTime(&st);
820 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
821 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
822 return buf;
823 }
825 bool os::getTimesSecs(double* process_real_time,
826 double* process_user_time,
827 double* process_system_time) {
828 HANDLE h_process = GetCurrentProcess();
829 FILETIME create_time, exit_time, kernel_time, user_time;
830 BOOL result = GetProcessTimes(h_process,
831 &create_time,
832 &exit_time,
833 &kernel_time,
834 &user_time);
835 if (result != 0) {
836 FILETIME wt;
837 GetSystemTimeAsFileTime(&wt);
838 jlong rtc_millis = windows_to_java_time(wt);
839 jlong user_millis = windows_to_java_time(user_time);
840 jlong system_millis = windows_to_java_time(kernel_time);
841 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
842 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
843 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
844 return true;
845 } else {
846 return false;
847 }
848 }
850 void os::shutdown() {
852 // allow PerfMemory to attempt cleanup of any persistent resources
853 perfMemory_exit();
855 // flush buffered output, finish log files
856 ostream_abort();
858 // Check for abort hook
859 abort_hook_t abort_hook = Arguments::abort_hook();
860 if (abort_hook != NULL) {
861 abort_hook();
862 }
863 }
865 void os::abort(bool dump_core)
866 {
867 os::shutdown();
868 // no core dump on Windows
869 ::exit(1);
870 }
872 // Die immediately, no exit hook, no abort hook, no cleanup.
873 void os::die() {
874 _exit(-1);
875 }
877 // Directory routines copied from src/win32/native/java/io/dirent_md.c
878 // * dirent_md.c 1.15 00/02/02
879 //
880 // The declarations for DIR and struct dirent are in jvm_win32.h.
882 /* Caller must have already run dirname through JVM_NativePath, which removes
883 duplicate slashes and converts all instances of '/' into '\\'. */
885 DIR *
886 os::opendir(const char *dirname)
887 {
888 assert(dirname != NULL, "just checking"); // hotspot change
889 DIR *dirp = (DIR *)malloc(sizeof(DIR));
890 DWORD fattr; // hotspot change
891 char alt_dirname[4] = { 0, 0, 0, 0 };
893 if (dirp == 0) {
894 errno = ENOMEM;
895 return 0;
896 }
898 /*
899 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
900 * as a directory in FindFirstFile(). We detect this case here and
901 * prepend the current drive name.
902 */
903 if (dirname[1] == '\0' && dirname[0] == '\\') {
904 alt_dirname[0] = _getdrive() + 'A' - 1;
905 alt_dirname[1] = ':';
906 alt_dirname[2] = '\\';
907 alt_dirname[3] = '\0';
908 dirname = alt_dirname;
909 }
911 dirp->path = (char *)malloc(strlen(dirname) + 5);
912 if (dirp->path == 0) {
913 free(dirp);
914 errno = ENOMEM;
915 return 0;
916 }
917 strcpy(dirp->path, dirname);
919 fattr = GetFileAttributes(dirp->path);
920 if (fattr == 0xffffffff) {
921 free(dirp->path);
922 free(dirp);
923 errno = ENOENT;
924 return 0;
925 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
926 free(dirp->path);
927 free(dirp);
928 errno = ENOTDIR;
929 return 0;
930 }
932 /* Append "*.*", or possibly "\\*.*", to path */
933 if (dirp->path[1] == ':'
934 && (dirp->path[2] == '\0'
935 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
936 /* No '\\' needed for cases like "Z:" or "Z:\" */
937 strcat(dirp->path, "*.*");
938 } else {
939 strcat(dirp->path, "\\*.*");
940 }
942 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
943 if (dirp->handle == INVALID_HANDLE_VALUE) {
944 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
945 free(dirp->path);
946 free(dirp);
947 errno = EACCES;
948 return 0;
949 }
950 }
951 return dirp;
952 }
954 /* parameter dbuf unused on Windows */
956 struct dirent *
957 os::readdir(DIR *dirp, dirent *dbuf)
958 {
959 assert(dirp != NULL, "just checking"); // hotspot change
960 if (dirp->handle == INVALID_HANDLE_VALUE) {
961 return 0;
962 }
964 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
966 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
967 if (GetLastError() == ERROR_INVALID_HANDLE) {
968 errno = EBADF;
969 return 0;
970 }
971 FindClose(dirp->handle);
972 dirp->handle = INVALID_HANDLE_VALUE;
973 }
975 return &dirp->dirent;
976 }
978 int
979 os::closedir(DIR *dirp)
980 {
981 assert(dirp != NULL, "just checking"); // hotspot change
982 if (dirp->handle != INVALID_HANDLE_VALUE) {
983 if (!FindClose(dirp->handle)) {
984 errno = EBADF;
985 return -1;
986 }
987 dirp->handle = INVALID_HANDLE_VALUE;
988 }
989 free(dirp->path);
990 free(dirp);
991 return 0;
992 }
994 const char* os::dll_file_extension() { return ".dll"; }
996 const char * os::get_temp_directory()
997 {
998 static char path_buf[MAX_PATH];
999 if (GetTempPath(MAX_PATH, path_buf)>0)
1000 return path_buf;
1001 else{
1002 path_buf[0]='\0';
1003 return path_buf;
1004 }
1005 }
1007 static bool file_exists(const char* filename) {
1008 if (filename == NULL || strlen(filename) == 0) {
1009 return false;
1010 }
1011 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1012 }
1014 void os::dll_build_name(char *buffer, size_t buflen,
1015 const char* pname, const char* fname) {
1016 // Copied from libhpi
1017 const size_t pnamelen = pname ? strlen(pname) : 0;
1018 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1020 // Quietly truncates on buffer overflow. Should be an error.
1021 if (pnamelen + strlen(fname) + 10 > buflen) {
1022 *buffer = '\0';
1023 return;
1024 }
1026 if (pnamelen == 0) {
1027 jio_snprintf(buffer, buflen, "%s.dll", fname);
1028 } else if (c == ':' || c == '\\') {
1029 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1030 } else if (strchr(pname, *os::path_separator()) != NULL) {
1031 int n;
1032 char** pelements = split_path(pname, &n);
1033 for (int i = 0 ; i < n ; i++) {
1034 char* path = pelements[i];
1035 // Really shouldn't be NULL, but check can't hurt
1036 size_t plen = (path == NULL) ? 0 : strlen(path);
1037 if (plen == 0) {
1038 continue; // skip the empty path values
1039 }
1040 const char lastchar = path[plen - 1];
1041 if (lastchar == ':' || lastchar == '\\') {
1042 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1043 } else {
1044 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1045 }
1046 if (file_exists(buffer)) {
1047 break;
1048 }
1049 }
1050 // release the storage
1051 for (int i = 0 ; i < n ; i++) {
1052 if (pelements[i] != NULL) {
1053 FREE_C_HEAP_ARRAY(char, pelements[i]);
1054 }
1055 }
1056 if (pelements != NULL) {
1057 FREE_C_HEAP_ARRAY(char*, pelements);
1058 }
1059 } else {
1060 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1061 }
1062 }
1064 // Needs to be in os specific directory because windows requires another
1065 // header file <direct.h>
1066 const char* os::get_current_directory(char *buf, int buflen) {
1067 return _getcwd(buf, buflen);
1068 }
1070 //-----------------------------------------------------------
1071 // Helper functions for fatal error handler
1073 // The following library functions are resolved dynamically at runtime:
1075 // PSAPI functions, for Windows NT, 2000, XP
1077 // psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform
1078 // SDK from Microsoft. Here are the definitions copied from psapi.h
1079 typedef struct _MODULEINFO {
1080 LPVOID lpBaseOfDll;
1081 DWORD SizeOfImage;
1082 LPVOID EntryPoint;
1083 } MODULEINFO, *LPMODULEINFO;
1085 static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD );
1086 static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD );
1087 static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD );
1089 // ToolHelp Functions, for Windows 95, 98 and ME
1091 static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ;
1092 static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ;
1093 static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ;
1095 bool _has_psapi;
1096 bool _psapi_init = false;
1097 bool _has_toolhelp;
1099 static bool _init_psapi() {
1100 HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ;
1101 if( psapi == NULL ) return false ;
1103 _EnumProcessModules = CAST_TO_FN_PTR(
1104 BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD),
1105 GetProcAddress(psapi, "EnumProcessModules")) ;
1106 _GetModuleFileNameEx = CAST_TO_FN_PTR(
1107 DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD),
1108 GetProcAddress(psapi, "GetModuleFileNameExA"));
1109 _GetModuleInformation = CAST_TO_FN_PTR(
1110 BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD),
1111 GetProcAddress(psapi, "GetModuleInformation"));
1113 _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation);
1114 _psapi_init = true;
1115 return _has_psapi;
1116 }
1118 static bool _init_toolhelp() {
1119 HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ;
1120 if (kernel32 == NULL) return false ;
1122 _CreateToolhelp32Snapshot = CAST_TO_FN_PTR(
1123 HANDLE(WINAPI *)(DWORD,DWORD),
1124 GetProcAddress(kernel32, "CreateToolhelp32Snapshot"));
1125 _Module32First = CAST_TO_FN_PTR(
1126 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1127 GetProcAddress(kernel32, "Module32First" ));
1128 _Module32Next = CAST_TO_FN_PTR(
1129 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1130 GetProcAddress(kernel32, "Module32Next" ));
1132 _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next);
1133 return _has_toolhelp;
1134 }
1136 #ifdef _WIN64
1137 // Helper routine which returns true if address in
1138 // within the NTDLL address space.
1139 //
1140 static bool _addr_in_ntdll( address addr )
1141 {
1142 HMODULE hmod;
1143 MODULEINFO minfo;
1145 hmod = GetModuleHandle("NTDLL.DLL");
1146 if ( hmod == NULL ) return false;
1147 if ( !_GetModuleInformation( GetCurrentProcess(), hmod,
1148 &minfo, sizeof(MODULEINFO)) )
1149 return false;
1151 if ( (addr >= minfo.lpBaseOfDll) &&
1152 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1153 return true;
1154 else
1155 return false;
1156 }
1157 #endif
1160 // Enumerate all modules for a given process ID
1161 //
1162 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1163 // different API for doing this. We use PSAPI.DLL on NT based
1164 // Windows and ToolHelp on 95/98/Me.
1166 // Callback function that is called by enumerate_modules() on
1167 // every DLL module.
1168 // Input parameters:
1169 // int pid,
1170 // char* module_file_name,
1171 // address module_base_addr,
1172 // unsigned module_size,
1173 // void* param
1174 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1176 // enumerate_modules for Windows NT, using PSAPI
1177 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1178 {
1179 HANDLE hProcess ;
1181 # define MAX_NUM_MODULES 128
1182 HMODULE modules[MAX_NUM_MODULES];
1183 static char filename[ MAX_PATH ];
1184 int result = 0;
1186 if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0;
1188 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1189 FALSE, pid ) ;
1190 if (hProcess == NULL) return 0;
1192 DWORD size_needed;
1193 if (!_EnumProcessModules(hProcess, modules,
1194 sizeof(modules), &size_needed)) {
1195 CloseHandle( hProcess );
1196 return 0;
1197 }
1199 // number of modules that are currently loaded
1200 int num_modules = size_needed / sizeof(HMODULE);
1202 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1203 // Get Full pathname:
1204 if(!_GetModuleFileNameEx(hProcess, modules[i],
1205 filename, sizeof(filename))) {
1206 filename[0] = '\0';
1207 }
1209 MODULEINFO modinfo;
1210 if (!_GetModuleInformation(hProcess, modules[i],
1211 &modinfo, sizeof(modinfo))) {
1212 modinfo.lpBaseOfDll = NULL;
1213 modinfo.SizeOfImage = 0;
1214 }
1216 // Invoke callback function
1217 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1218 modinfo.SizeOfImage, param);
1219 if (result) break;
1220 }
1222 CloseHandle( hProcess ) ;
1223 return result;
1224 }
1227 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1228 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1229 {
1230 HANDLE hSnapShot ;
1231 static MODULEENTRY32 modentry ;
1232 int result = 0;
1234 if (!_has_toolhelp) return 0;
1236 // Get a handle to a Toolhelp snapshot of the system
1237 hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1238 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1239 return FALSE ;
1240 }
1242 // iterate through all modules
1243 modentry.dwSize = sizeof(MODULEENTRY32) ;
1244 bool not_done = _Module32First( hSnapShot, &modentry ) != 0;
1246 while( not_done ) {
1247 // invoke the callback
1248 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1249 modentry.modBaseSize, param);
1250 if (result) break;
1252 modentry.dwSize = sizeof(MODULEENTRY32) ;
1253 not_done = _Module32Next( hSnapShot, &modentry ) != 0;
1254 }
1256 CloseHandle(hSnapShot);
1257 return result;
1258 }
1260 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1261 {
1262 // Get current process ID if caller doesn't provide it.
1263 if (!pid) pid = os::current_process_id();
1265 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1266 else return _enumerate_modules_windows(pid, func, param);
1267 }
1269 struct _modinfo {
1270 address addr;
1271 char* full_path; // point to a char buffer
1272 int buflen; // size of the buffer
1273 address base_addr;
1274 };
1276 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1277 unsigned size, void * param) {
1278 struct _modinfo *pmod = (struct _modinfo *)param;
1279 if (!pmod) return -1;
1281 if (base_addr <= pmod->addr &&
1282 base_addr+size > pmod->addr) {
1283 // if a buffer is provided, copy path name to the buffer
1284 if (pmod->full_path) {
1285 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1286 }
1287 pmod->base_addr = base_addr;
1288 return 1;
1289 }
1290 return 0;
1291 }
1293 bool os::dll_address_to_library_name(address addr, char* buf,
1294 int buflen, int* offset) {
1295 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1296 // return the full path to the DLL file, sometimes it returns path
1297 // to the corresponding PDB file (debug info); sometimes it only
1298 // returns partial path, which makes life painful.
1300 struct _modinfo mi;
1301 mi.addr = addr;
1302 mi.full_path = buf;
1303 mi.buflen = buflen;
1304 int pid = os::current_process_id();
1305 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1306 // buf already contains path name
1307 if (offset) *offset = addr - mi.base_addr;
1308 return true;
1309 } else {
1310 if (buf) buf[0] = '\0';
1311 if (offset) *offset = -1;
1312 return false;
1313 }
1314 }
1316 bool os::dll_address_to_function_name(address addr, char *buf,
1317 int buflen, int *offset) {
1318 // Unimplemented on Windows - in order to use SymGetSymFromAddr(),
1319 // we need to initialize imagehlp/dbghelp, then load symbol table
1320 // for every module. That's too much work to do after a fatal error.
1321 // For an example on how to implement this function, see 1.4.2.
1322 if (offset) *offset = -1;
1323 if (buf) buf[0] = '\0';
1324 return false;
1325 }
1327 void* os::dll_lookup(void* handle, const char* name) {
1328 return GetProcAddress((HMODULE)handle, name);
1329 }
1331 // save the start and end address of jvm.dll into param[0] and param[1]
1332 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1333 unsigned size, void * param) {
1334 if (!param) return -1;
1336 if (base_addr <= (address)_locate_jvm_dll &&
1337 base_addr+size > (address)_locate_jvm_dll) {
1338 ((address*)param)[0] = base_addr;
1339 ((address*)param)[1] = base_addr + size;
1340 return 1;
1341 }
1342 return 0;
1343 }
1345 address vm_lib_location[2]; // start and end address of jvm.dll
1347 // check if addr is inside jvm.dll
1348 bool os::address_is_in_vm(address addr) {
1349 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1350 int pid = os::current_process_id();
1351 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1352 assert(false, "Can't find jvm module.");
1353 return false;
1354 }
1355 }
1357 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1358 }
1360 // print module info; param is outputStream*
1361 static int _print_module(int pid, char* fname, address base,
1362 unsigned size, void* param) {
1363 if (!param) return -1;
1365 outputStream* st = (outputStream*)param;
1367 address end_addr = base + size;
1368 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1369 return 0;
1370 }
1372 // Loads .dll/.so and
1373 // in case of error it checks if .dll/.so was built for the
1374 // same architecture as Hotspot is running on
1375 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1376 {
1377 void * result = LoadLibrary(name);
1378 if (result != NULL)
1379 {
1380 return result;
1381 }
1383 long errcode = GetLastError();
1384 if (errcode == ERROR_MOD_NOT_FOUND) {
1385 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1386 ebuf[ebuflen-1]='\0';
1387 return NULL;
1388 }
1390 // Parsing dll below
1391 // If we can read dll-info and find that dll was built
1392 // for an architecture other than Hotspot is running in
1393 // - then print to buffer "DLL was built for a different architecture"
1394 // else call getLastErrorString to obtain system error message
1396 // Read system error message into ebuf
1397 // It may or may not be overwritten below (in the for loop and just above)
1398 getLastErrorString(ebuf, (size_t) ebuflen);
1399 ebuf[ebuflen-1]='\0';
1400 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1401 if (file_descriptor<0)
1402 {
1403 return NULL;
1404 }
1406 uint32_t signature_offset;
1407 uint16_t lib_arch=0;
1408 bool failed_to_get_lib_arch=
1409 (
1410 //Go to position 3c in the dll
1411 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1412 ||
1413 // Read loacation of signature
1414 (sizeof(signature_offset)!=
1415 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1416 ||
1417 //Go to COFF File Header in dll
1418 //that is located after"signature" (4 bytes long)
1419 (os::seek_to_file_offset(file_descriptor,
1420 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1421 ||
1422 //Read field that contains code of architecture
1423 // that dll was build for
1424 (sizeof(lib_arch)!=
1425 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1426 );
1428 ::close(file_descriptor);
1429 if (failed_to_get_lib_arch)
1430 {
1431 // file i/o error - report getLastErrorString(...) msg
1432 return NULL;
1433 }
1435 typedef struct
1436 {
1437 uint16_t arch_code;
1438 char* arch_name;
1439 } arch_t;
1441 static const arch_t arch_array[]={
1442 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1443 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1444 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1445 };
1446 #if (defined _M_IA64)
1447 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1448 #elif (defined _M_AMD64)
1449 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1450 #elif (defined _M_IX86)
1451 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1452 #else
1453 #error Method os::dll_load requires that one of following \
1454 is defined :_M_IA64,_M_AMD64 or _M_IX86
1455 #endif
1458 // Obtain a string for printf operation
1459 // lib_arch_str shall contain string what platform this .dll was built for
1460 // running_arch_str shall string contain what platform Hotspot was built for
1461 char *running_arch_str=NULL,*lib_arch_str=NULL;
1462 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1463 {
1464 if (lib_arch==arch_array[i].arch_code)
1465 lib_arch_str=arch_array[i].arch_name;
1466 if (running_arch==arch_array[i].arch_code)
1467 running_arch_str=arch_array[i].arch_name;
1468 }
1470 assert(running_arch_str,
1471 "Didn't find runing architecture code in arch_array");
1473 // If the architure is right
1474 // but some other error took place - report getLastErrorString(...) msg
1475 if (lib_arch == running_arch)
1476 {
1477 return NULL;
1478 }
1480 if (lib_arch_str!=NULL)
1481 {
1482 ::_snprintf(ebuf, ebuflen-1,
1483 "Can't load %s-bit .dll on a %s-bit platform",
1484 lib_arch_str,running_arch_str);
1485 }
1486 else
1487 {
1488 // don't know what architecture this dll was build for
1489 ::_snprintf(ebuf, ebuflen-1,
1490 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1491 lib_arch,running_arch_str);
1492 }
1494 return NULL;
1495 }
1498 void os::print_dll_info(outputStream *st) {
1499 int pid = os::current_process_id();
1500 st->print_cr("Dynamic libraries:");
1501 enumerate_modules(pid, _print_module, (void *)st);
1502 }
1504 // function pointer to Windows API "GetNativeSystemInfo".
1505 typedef void (WINAPI *GetNativeSystemInfo_func_type)(LPSYSTEM_INFO);
1506 static GetNativeSystemInfo_func_type _GetNativeSystemInfo;
1508 void os::print_os_info(outputStream* st) {
1509 st->print("OS:");
1511 OSVERSIONINFOEX osvi;
1512 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1513 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1515 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1516 st->print_cr("N/A");
1517 return;
1518 }
1520 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1521 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1522 switch (os_vers) {
1523 case 3051: st->print(" Windows NT 3.51"); break;
1524 case 4000: st->print(" Windows NT 4.0"); break;
1525 case 5000: st->print(" Windows 2000"); break;
1526 case 5001: st->print(" Windows XP"); break;
1527 case 5002:
1528 case 6000: {
1529 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1530 // find out whether we are running on 64 bit processor or not.
1531 SYSTEM_INFO si;
1532 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1533 // Check to see if _GetNativeSystemInfo has been initialized.
1534 if (_GetNativeSystemInfo == NULL) {
1535 HMODULE hKernel32 = GetModuleHandle(TEXT("kernel32.dll"));
1536 _GetNativeSystemInfo =
1537 CAST_TO_FN_PTR(GetNativeSystemInfo_func_type,
1538 GetProcAddress(hKernel32,
1539 "GetNativeSystemInfo"));
1540 if (_GetNativeSystemInfo == NULL)
1541 GetSystemInfo(&si);
1542 } else {
1543 _GetNativeSystemInfo(&si);
1544 }
1545 if (os_vers == 5002) {
1546 if (osvi.wProductType == VER_NT_WORKSTATION &&
1547 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1548 st->print(" Windows XP x64 Edition");
1549 else
1550 st->print(" Windows Server 2003 family");
1551 } else { // os_vers == 6000
1552 if (osvi.wProductType == VER_NT_WORKSTATION)
1553 st->print(" Windows Vista");
1554 else
1555 st->print(" Windows Server 2008");
1556 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1557 st->print(" , 64 bit");
1558 }
1559 break;
1560 }
1561 default: // future windows, print out its major and minor versions
1562 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1563 }
1564 } else {
1565 switch (os_vers) {
1566 case 4000: st->print(" Windows 95"); break;
1567 case 4010: st->print(" Windows 98"); break;
1568 case 4090: st->print(" Windows Me"); break;
1569 default: // future windows, print out its major and minor versions
1570 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1571 }
1572 }
1573 st->print(" Build %d", osvi.dwBuildNumber);
1574 st->print(" %s", osvi.szCSDVersion); // service pack
1575 st->cr();
1576 }
1578 void os::print_memory_info(outputStream* st) {
1579 st->print("Memory:");
1580 st->print(" %dk page", os::vm_page_size()>>10);
1582 // FIXME: GlobalMemoryStatus() may return incorrect value if total memory
1583 // is larger than 4GB
1584 MEMORYSTATUS ms;
1585 GlobalMemoryStatus(&ms);
1587 st->print(", physical %uk", os::physical_memory() >> 10);
1588 st->print("(%uk free)", os::available_memory() >> 10);
1590 st->print(", swap %uk", ms.dwTotalPageFile >> 10);
1591 st->print("(%uk free)", ms.dwAvailPageFile >> 10);
1592 st->cr();
1593 }
1595 void os::print_siginfo(outputStream *st, void *siginfo) {
1596 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1597 st->print("siginfo:");
1598 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1600 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1601 er->NumberParameters >= 2) {
1602 switch (er->ExceptionInformation[0]) {
1603 case 0: st->print(", reading address"); break;
1604 case 1: st->print(", writing address"); break;
1605 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1606 er->ExceptionInformation[0]);
1607 }
1608 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1609 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1610 er->NumberParameters >= 2 && UseSharedSpaces) {
1611 FileMapInfo* mapinfo = FileMapInfo::current_info();
1612 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1613 st->print("\n\nError accessing class data sharing archive." \
1614 " Mapped file inaccessible during execution, " \
1615 " possible disk/network problem.");
1616 }
1617 } else {
1618 int num = er->NumberParameters;
1619 if (num > 0) {
1620 st->print(", ExceptionInformation=");
1621 for (int i = 0; i < num; i++) {
1622 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1623 }
1624 }
1625 }
1626 st->cr();
1627 }
1629 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1630 // do nothing
1631 }
1633 static char saved_jvm_path[MAX_PATH] = {0};
1635 // Find the full path to the current module, jvm.dll or jvm_g.dll
1636 void os::jvm_path(char *buf, jint buflen) {
1637 // Error checking.
1638 if (buflen < MAX_PATH) {
1639 assert(false, "must use a large-enough buffer");
1640 buf[0] = '\0';
1641 return;
1642 }
1643 // Lazy resolve the path to current module.
1644 if (saved_jvm_path[0] != 0) {
1645 strcpy(buf, saved_jvm_path);
1646 return;
1647 }
1649 GetModuleFileName(vm_lib_handle, buf, buflen);
1650 strcpy(saved_jvm_path, buf);
1651 }
1654 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1655 #ifndef _WIN64
1656 st->print("_");
1657 #endif
1658 }
1661 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1662 #ifndef _WIN64
1663 st->print("@%d", args_size * sizeof(int));
1664 #endif
1665 }
1667 // sun.misc.Signal
1668 // NOTE that this is a workaround for an apparent kernel bug where if
1669 // a signal handler for SIGBREAK is installed then that signal handler
1670 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1671 // See bug 4416763.
1672 static void (*sigbreakHandler)(int) = NULL;
1674 static void UserHandler(int sig, void *siginfo, void *context) {
1675 os::signal_notify(sig);
1676 // We need to reinstate the signal handler each time...
1677 os::signal(sig, (void*)UserHandler);
1678 }
1680 void* os::user_handler() {
1681 return (void*) UserHandler;
1682 }
1684 void* os::signal(int signal_number, void* handler) {
1685 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1686 void (*oldHandler)(int) = sigbreakHandler;
1687 sigbreakHandler = (void (*)(int)) handler;
1688 return (void*) oldHandler;
1689 } else {
1690 return (void*)::signal(signal_number, (void (*)(int))handler);
1691 }
1692 }
1694 void os::signal_raise(int signal_number) {
1695 raise(signal_number);
1696 }
1698 // The Win32 C runtime library maps all console control events other than ^C
1699 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1700 // logoff, and shutdown events. We therefore install our own console handler
1701 // that raises SIGTERM for the latter cases.
1702 //
1703 static BOOL WINAPI consoleHandler(DWORD event) {
1704 switch(event) {
1705 case CTRL_C_EVENT:
1706 if (is_error_reported()) {
1707 // Ctrl-C is pressed during error reporting, likely because the error
1708 // handler fails to abort. Let VM die immediately.
1709 os::die();
1710 }
1712 os::signal_raise(SIGINT);
1713 return TRUE;
1714 break;
1715 case CTRL_BREAK_EVENT:
1716 if (sigbreakHandler != NULL) {
1717 (*sigbreakHandler)(SIGBREAK);
1718 }
1719 return TRUE;
1720 break;
1721 case CTRL_CLOSE_EVENT:
1722 case CTRL_LOGOFF_EVENT:
1723 case CTRL_SHUTDOWN_EVENT:
1724 os::signal_raise(SIGTERM);
1725 return TRUE;
1726 break;
1727 default:
1728 break;
1729 }
1730 return FALSE;
1731 }
1733 /*
1734 * The following code is moved from os.cpp for making this
1735 * code platform specific, which it is by its very nature.
1736 */
1738 // Return maximum OS signal used + 1 for internal use only
1739 // Used as exit signal for signal_thread
1740 int os::sigexitnum_pd(){
1741 return NSIG;
1742 }
1744 // a counter for each possible signal value, including signal_thread exit signal
1745 static volatile jint pending_signals[NSIG+1] = { 0 };
1746 static HANDLE sig_sem;
1748 void os::signal_init_pd() {
1749 // Initialize signal structures
1750 memset((void*)pending_signals, 0, sizeof(pending_signals));
1752 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
1754 // Programs embedding the VM do not want it to attempt to receive
1755 // events like CTRL_LOGOFF_EVENT, which are used to implement the
1756 // shutdown hooks mechanism introduced in 1.3. For example, when
1757 // the VM is run as part of a Windows NT service (i.e., a servlet
1758 // engine in a web server), the correct behavior is for any console
1759 // control handler to return FALSE, not TRUE, because the OS's
1760 // "final" handler for such events allows the process to continue if
1761 // it is a service (while terminating it if it is not a service).
1762 // To make this behavior uniform and the mechanism simpler, we
1763 // completely disable the VM's usage of these console events if -Xrs
1764 // (=ReduceSignalUsage) is specified. This means, for example, that
1765 // the CTRL-BREAK thread dump mechanism is also disabled in this
1766 // case. See bugs 4323062, 4345157, and related bugs.
1768 if (!ReduceSignalUsage) {
1769 // Add a CTRL-C handler
1770 SetConsoleCtrlHandler(consoleHandler, TRUE);
1771 }
1772 }
1774 void os::signal_notify(int signal_number) {
1775 BOOL ret;
1777 Atomic::inc(&pending_signals[signal_number]);
1778 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1779 assert(ret != 0, "ReleaseSemaphore() failed");
1780 }
1782 static int check_pending_signals(bool wait_for_signal) {
1783 DWORD ret;
1784 while (true) {
1785 for (int i = 0; i < NSIG + 1; i++) {
1786 jint n = pending_signals[i];
1787 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1788 return i;
1789 }
1790 }
1791 if (!wait_for_signal) {
1792 return -1;
1793 }
1795 JavaThread *thread = JavaThread::current();
1797 ThreadBlockInVM tbivm(thread);
1799 bool threadIsSuspended;
1800 do {
1801 thread->set_suspend_equivalent();
1802 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1803 ret = ::WaitForSingleObject(sig_sem, INFINITE);
1804 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
1806 // were we externally suspended while we were waiting?
1807 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1808 if (threadIsSuspended) {
1809 //
1810 // The semaphore has been incremented, but while we were waiting
1811 // another thread suspended us. We don't want to continue running
1812 // while suspended because that would surprise the thread that
1813 // suspended us.
1814 //
1815 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1816 assert(ret != 0, "ReleaseSemaphore() failed");
1818 thread->java_suspend_self();
1819 }
1820 } while (threadIsSuspended);
1821 }
1822 }
1824 int os::signal_lookup() {
1825 return check_pending_signals(false);
1826 }
1828 int os::signal_wait() {
1829 return check_pending_signals(true);
1830 }
1832 // Implicit OS exception handling
1834 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
1835 JavaThread* thread = JavaThread::current();
1836 // Save pc in thread
1837 #ifdef _M_IA64
1838 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP);
1839 // Set pc to handler
1840 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
1841 #elif _M_AMD64
1842 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip);
1843 // Set pc to handler
1844 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
1845 #else
1846 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip);
1847 // Set pc to handler
1848 exceptionInfo->ContextRecord->Eip = (LONG)handler;
1849 #endif
1851 // Continue the execution
1852 return EXCEPTION_CONTINUE_EXECUTION;
1853 }
1856 // Used for PostMortemDump
1857 extern "C" void safepoints();
1858 extern "C" void find(int x);
1859 extern "C" void events();
1861 // According to Windows API documentation, an illegal instruction sequence should generate
1862 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
1863 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
1864 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
1866 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
1868 // From "Execution Protection in the Windows Operating System" draft 0.35
1869 // Once a system header becomes available, the "real" define should be
1870 // included or copied here.
1871 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
1873 #define def_excpt(val) #val, val
1875 struct siglabel {
1876 char *name;
1877 int number;
1878 };
1880 struct siglabel exceptlabels[] = {
1881 def_excpt(EXCEPTION_ACCESS_VIOLATION),
1882 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
1883 def_excpt(EXCEPTION_BREAKPOINT),
1884 def_excpt(EXCEPTION_SINGLE_STEP),
1885 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
1886 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
1887 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
1888 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
1889 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
1890 def_excpt(EXCEPTION_FLT_OVERFLOW),
1891 def_excpt(EXCEPTION_FLT_STACK_CHECK),
1892 def_excpt(EXCEPTION_FLT_UNDERFLOW),
1893 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
1894 def_excpt(EXCEPTION_INT_OVERFLOW),
1895 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
1896 def_excpt(EXCEPTION_IN_PAGE_ERROR),
1897 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
1898 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
1899 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
1900 def_excpt(EXCEPTION_STACK_OVERFLOW),
1901 def_excpt(EXCEPTION_INVALID_DISPOSITION),
1902 def_excpt(EXCEPTION_GUARD_PAGE),
1903 def_excpt(EXCEPTION_INVALID_HANDLE),
1904 NULL, 0
1905 };
1907 const char* os::exception_name(int exception_code, char *buf, size_t size) {
1908 for (int i = 0; exceptlabels[i].name != NULL; i++) {
1909 if (exceptlabels[i].number == exception_code) {
1910 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
1911 return buf;
1912 }
1913 }
1915 return NULL;
1916 }
1918 //-----------------------------------------------------------------------------
1919 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
1920 // handle exception caused by idiv; should only happen for -MinInt/-1
1921 // (division by zero is handled explicitly)
1922 #ifdef _M_IA64
1923 assert(0, "Fix Handle_IDiv_Exception");
1924 #elif _M_AMD64
1925 PCONTEXT ctx = exceptionInfo->ContextRecord;
1926 address pc = (address)ctx->Rip;
1927 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
1928 assert(pc[0] == 0xF7, "not an idiv opcode");
1929 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
1930 assert(ctx->Rax == min_jint, "unexpected idiv exception");
1931 // set correct result values and continue after idiv instruction
1932 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
1933 ctx->Rax = (DWORD)min_jint; // result
1934 ctx->Rdx = (DWORD)0; // remainder
1935 // Continue the execution
1936 #else
1937 PCONTEXT ctx = exceptionInfo->ContextRecord;
1938 address pc = (address)ctx->Eip;
1939 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
1940 assert(pc[0] == 0xF7, "not an idiv opcode");
1941 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
1942 assert(ctx->Eax == min_jint, "unexpected idiv exception");
1943 // set correct result values and continue after idiv instruction
1944 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
1945 ctx->Eax = (DWORD)min_jint; // result
1946 ctx->Edx = (DWORD)0; // remainder
1947 // Continue the execution
1948 #endif
1949 return EXCEPTION_CONTINUE_EXECUTION;
1950 }
1952 #ifndef _WIN64
1953 //-----------------------------------------------------------------------------
1954 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
1955 // handle exception caused by native mothod modifying control word
1956 PCONTEXT ctx = exceptionInfo->ContextRecord;
1957 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
1959 switch (exception_code) {
1960 case EXCEPTION_FLT_DENORMAL_OPERAND:
1961 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
1962 case EXCEPTION_FLT_INEXACT_RESULT:
1963 case EXCEPTION_FLT_INVALID_OPERATION:
1964 case EXCEPTION_FLT_OVERFLOW:
1965 case EXCEPTION_FLT_STACK_CHECK:
1966 case EXCEPTION_FLT_UNDERFLOW:
1967 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
1968 if (fp_control_word != ctx->FloatSave.ControlWord) {
1969 // Restore FPCW and mask out FLT exceptions
1970 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
1971 // Mask out pending FLT exceptions
1972 ctx->FloatSave.StatusWord &= 0xffffff00;
1973 return EXCEPTION_CONTINUE_EXECUTION;
1974 }
1975 }
1976 return EXCEPTION_CONTINUE_SEARCH;
1977 }
1978 #else //_WIN64
1979 /*
1980 On Windows, the mxcsr control bits are non-volatile across calls
1981 See also CR 6192333
1982 If EXCEPTION_FLT_* happened after some native method modified
1983 mxcsr - it is not a jvm fault.
1984 However should we decide to restore of mxcsr after a faulty
1985 native method we can uncomment following code
1986 jint MxCsr = INITIAL_MXCSR;
1987 // we can't use StubRoutines::addr_mxcsr_std()
1988 // because in Win64 mxcsr is not saved there
1989 if (MxCsr != ctx->MxCsr) {
1990 ctx->MxCsr = MxCsr;
1991 return EXCEPTION_CONTINUE_EXECUTION;
1992 }
1994 */
1995 #endif //_WIN64
1998 // Fatal error reporting is single threaded so we can make this a
1999 // static and preallocated. If it's more than MAX_PATH silently ignore
2000 // it.
2001 static char saved_error_file[MAX_PATH] = {0};
2003 void os::set_error_file(const char *logfile) {
2004 if (strlen(logfile) <= MAX_PATH) {
2005 strncpy(saved_error_file, logfile, MAX_PATH);
2006 }
2007 }
2009 static inline void report_error(Thread* t, DWORD exception_code,
2010 address addr, void* siginfo, void* context) {
2011 VMError err(t, exception_code, addr, siginfo, context);
2012 err.report_and_die();
2014 // If UseOsErrorReporting, this will return here and save the error file
2015 // somewhere where we can find it in the minidump.
2016 }
2018 //-----------------------------------------------------------------------------
2019 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2020 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2021 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2022 #ifdef _M_IA64
2023 address pc = (address) exceptionInfo->ContextRecord->StIIP;
2024 #elif _M_AMD64
2025 address pc = (address) exceptionInfo->ContextRecord->Rip;
2026 #else
2027 address pc = (address) exceptionInfo->ContextRecord->Eip;
2028 #endif
2029 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2031 #ifndef _WIN64
2032 // Execution protection violation - win32 running on AMD64 only
2033 // Handled first to avoid misdiagnosis as a "normal" access violation;
2034 // This is safe to do because we have a new/unique ExceptionInformation
2035 // code for this condition.
2036 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2037 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2038 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2039 address addr = (address) exceptionRecord->ExceptionInformation[1];
2041 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2042 int page_size = os::vm_page_size();
2044 // Make sure the pc and the faulting address are sane.
2045 //
2046 // If an instruction spans a page boundary, and the page containing
2047 // the beginning of the instruction is executable but the following
2048 // page is not, the pc and the faulting address might be slightly
2049 // different - we still want to unguard the 2nd page in this case.
2050 //
2051 // 15 bytes seems to be a (very) safe value for max instruction size.
2052 bool pc_is_near_addr =
2053 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2054 bool instr_spans_page_boundary =
2055 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2056 (intptr_t) page_size) > 0);
2058 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2059 static volatile address last_addr =
2060 (address) os::non_memory_address_word();
2062 // In conservative mode, don't unguard unless the address is in the VM
2063 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2064 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2066 // Set memory to RWX and retry
2067 address page_start =
2068 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2069 bool res = os::protect_memory((char*) page_start, page_size,
2070 os::MEM_PROT_RWX);
2072 if (PrintMiscellaneous && Verbose) {
2073 char buf[256];
2074 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2075 "at " INTPTR_FORMAT
2076 ", unguarding " INTPTR_FORMAT ": %s", addr,
2077 page_start, (res ? "success" : strerror(errno)));
2078 tty->print_raw_cr(buf);
2079 }
2081 // Set last_addr so if we fault again at the same address, we don't
2082 // end up in an endless loop.
2083 //
2084 // There are two potential complications here. Two threads trapping
2085 // at the same address at the same time could cause one of the
2086 // threads to think it already unguarded, and abort the VM. Likely
2087 // very rare.
2088 //
2089 // The other race involves two threads alternately trapping at
2090 // different addresses and failing to unguard the page, resulting in
2091 // an endless loop. This condition is probably even more unlikely
2092 // than the first.
2093 //
2094 // Although both cases could be avoided by using locks or thread
2095 // local last_addr, these solutions are unnecessary complication:
2096 // this handler is a best-effort safety net, not a complete solution.
2097 // It is disabled by default and should only be used as a workaround
2098 // in case we missed any no-execute-unsafe VM code.
2100 last_addr = addr;
2102 return EXCEPTION_CONTINUE_EXECUTION;
2103 }
2104 }
2106 // Last unguard failed or not unguarding
2107 tty->print_raw_cr("Execution protection violation");
2108 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2109 exceptionInfo->ContextRecord);
2110 return EXCEPTION_CONTINUE_SEARCH;
2111 }
2112 }
2113 #endif // _WIN64
2115 // Check to see if we caught the safepoint code in the
2116 // process of write protecting the memory serialization page.
2117 // It write enables the page immediately after protecting it
2118 // so just return.
2119 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2120 JavaThread* thread = (JavaThread*) t;
2121 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2122 address addr = (address) exceptionRecord->ExceptionInformation[1];
2123 if ( os::is_memory_serialize_page(thread, addr) ) {
2124 // Block current thread until the memory serialize page permission restored.
2125 os::block_on_serialize_page_trap();
2126 return EXCEPTION_CONTINUE_EXECUTION;
2127 }
2128 }
2131 if (t != NULL && t->is_Java_thread()) {
2132 JavaThread* thread = (JavaThread*) t;
2133 bool in_java = thread->thread_state() == _thread_in_Java;
2135 // Handle potential stack overflows up front.
2136 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2137 if (os::uses_stack_guard_pages()) {
2138 #ifdef _M_IA64
2139 //
2140 // If it's a legal stack address continue, Windows will map it in.
2141 //
2142 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2143 address addr = (address) exceptionRecord->ExceptionInformation[1];
2144 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() )
2145 return EXCEPTION_CONTINUE_EXECUTION;
2147 // The register save area is the same size as the memory stack
2148 // and starts at the page just above the start of the memory stack.
2149 // If we get a fault in this area, we've run out of register
2150 // stack. If we are in java, try throwing a stack overflow exception.
2151 if (addr > thread->stack_base() &&
2152 addr <= (thread->stack_base()+thread->stack_size()) ) {
2153 char buf[256];
2154 jio_snprintf(buf, sizeof(buf),
2155 "Register stack overflow, addr:%p, stack_base:%p\n",
2156 addr, thread->stack_base() );
2157 tty->print_raw_cr(buf);
2158 // If not in java code, return and hope for the best.
2159 return in_java ? Handle_Exception(exceptionInfo,
2160 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2161 : EXCEPTION_CONTINUE_EXECUTION;
2162 }
2163 #endif
2164 if (thread->stack_yellow_zone_enabled()) {
2165 // Yellow zone violation. The o/s has unprotected the first yellow
2166 // zone page for us. Note: must call disable_stack_yellow_zone to
2167 // update the enabled status, even if the zone contains only one page.
2168 thread->disable_stack_yellow_zone();
2169 // If not in java code, return and hope for the best.
2170 return in_java ? Handle_Exception(exceptionInfo,
2171 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2172 : EXCEPTION_CONTINUE_EXECUTION;
2173 } else {
2174 // Fatal red zone violation.
2175 thread->disable_stack_red_zone();
2176 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2177 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2178 exceptionInfo->ContextRecord);
2179 return EXCEPTION_CONTINUE_SEARCH;
2180 }
2181 } else if (in_java) {
2182 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2183 // a one-time-only guard page, which it has released to us. The next
2184 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2185 return Handle_Exception(exceptionInfo,
2186 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2187 } else {
2188 // Can only return and hope for the best. Further stack growth will
2189 // result in an ACCESS_VIOLATION.
2190 return EXCEPTION_CONTINUE_EXECUTION;
2191 }
2192 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2193 // Either stack overflow or null pointer exception.
2194 if (in_java) {
2195 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2196 address addr = (address) exceptionRecord->ExceptionInformation[1];
2197 address stack_end = thread->stack_base() - thread->stack_size();
2198 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2199 // Stack overflow.
2200 assert(!os::uses_stack_guard_pages(),
2201 "should be caught by red zone code above.");
2202 return Handle_Exception(exceptionInfo,
2203 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2204 }
2205 //
2206 // Check for safepoint polling and implicit null
2207 // We only expect null pointers in the stubs (vtable)
2208 // the rest are checked explicitly now.
2209 //
2210 CodeBlob* cb = CodeCache::find_blob(pc);
2211 if (cb != NULL) {
2212 if (os::is_poll_address(addr)) {
2213 address stub = SharedRuntime::get_poll_stub(pc);
2214 return Handle_Exception(exceptionInfo, stub);
2215 }
2216 }
2217 {
2218 #ifdef _WIN64
2219 //
2220 // If it's a legal stack address map the entire region in
2221 //
2222 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2223 address addr = (address) exceptionRecord->ExceptionInformation[1];
2224 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2225 addr = (address)((uintptr_t)addr &
2226 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2227 os::commit_memory((char *)addr, thread->stack_base() - addr,
2228 false );
2229 return EXCEPTION_CONTINUE_EXECUTION;
2230 }
2231 else
2232 #endif
2233 {
2234 // Null pointer exception.
2235 #ifdef _M_IA64
2236 // We catch register stack overflows in compiled code by doing
2237 // an explicit compare and executing a st8(G0, G0) if the
2238 // BSP enters into our guard area. We test for the overflow
2239 // condition and fall into the normal null pointer exception
2240 // code if BSP hasn't overflowed.
2241 if ( in_java ) {
2242 if(thread->register_stack_overflow()) {
2243 assert((address)exceptionInfo->ContextRecord->IntS3 ==
2244 thread->register_stack_limit(),
2245 "GR7 doesn't contain register_stack_limit");
2246 // Disable the yellow zone which sets the state that
2247 // we've got a stack overflow problem.
2248 if (thread->stack_yellow_zone_enabled()) {
2249 thread->disable_stack_yellow_zone();
2250 }
2251 // Give us some room to process the exception
2252 thread->disable_register_stack_guard();
2253 // Update GR7 with the new limit so we can continue running
2254 // compiled code.
2255 exceptionInfo->ContextRecord->IntS3 =
2256 (ULONGLONG)thread->register_stack_limit();
2257 return Handle_Exception(exceptionInfo,
2258 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2259 } else {
2260 //
2261 // Check for implicit null
2262 // We only expect null pointers in the stubs (vtable)
2263 // the rest are checked explicitly now.
2264 //
2265 if (((uintptr_t)addr) < os::vm_page_size() ) {
2266 // an access to the first page of VM--assume it is a null pointer
2267 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2268 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2269 }
2270 }
2271 } // in_java
2273 // IA64 doesn't use implicit null checking yet. So we shouldn't
2274 // get here.
2275 tty->print_raw_cr("Access violation, possible null pointer exception");
2276 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2277 exceptionInfo->ContextRecord);
2278 return EXCEPTION_CONTINUE_SEARCH;
2279 #else /* !IA64 */
2281 // Windows 98 reports faulting addresses incorrectly
2282 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2283 !os::win32::is_nt()) {
2284 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2285 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2286 }
2287 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2288 exceptionInfo->ContextRecord);
2289 return EXCEPTION_CONTINUE_SEARCH;
2290 #endif
2291 }
2292 }
2293 }
2295 #ifdef _WIN64
2296 // Special care for fast JNI field accessors.
2297 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2298 // in and the heap gets shrunk before the field access.
2299 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2300 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2301 if (addr != (address)-1) {
2302 return Handle_Exception(exceptionInfo, addr);
2303 }
2304 }
2305 #endif
2307 #ifdef _WIN64
2308 // Windows will sometimes generate an access violation
2309 // when we call malloc. Since we use VectoredExceptions
2310 // on 64 bit platforms, we see this exception. We must
2311 // pass this exception on so Windows can recover.
2312 // We check to see if the pc of the fault is in NTDLL.DLL
2313 // if so, we pass control on to Windows for handling.
2314 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH;
2315 #endif
2317 // Stack overflow or null pointer exception in native code.
2318 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2319 exceptionInfo->ContextRecord);
2320 return EXCEPTION_CONTINUE_SEARCH;
2321 }
2323 if (in_java) {
2324 switch (exception_code) {
2325 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2326 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2328 case EXCEPTION_INT_OVERFLOW:
2329 return Handle_IDiv_Exception(exceptionInfo);
2331 } // switch
2332 }
2333 #ifndef _WIN64
2334 if ((thread->thread_state() == _thread_in_Java) ||
2335 (thread->thread_state() == _thread_in_native) )
2336 {
2337 LONG result=Handle_FLT_Exception(exceptionInfo);
2338 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2339 }
2340 #endif //_WIN64
2341 }
2343 if (exception_code != EXCEPTION_BREAKPOINT) {
2344 #ifndef _WIN64
2345 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2346 exceptionInfo->ContextRecord);
2347 #else
2348 // Itanium Windows uses a VectoredExceptionHandler
2349 // Which means that C++ programatic exception handlers (try/except)
2350 // will get here. Continue the search for the right except block if
2351 // the exception code is not a fatal code.
2352 switch ( exception_code ) {
2353 case EXCEPTION_ACCESS_VIOLATION:
2354 case EXCEPTION_STACK_OVERFLOW:
2355 case EXCEPTION_ILLEGAL_INSTRUCTION:
2356 case EXCEPTION_ILLEGAL_INSTRUCTION_2:
2357 case EXCEPTION_INT_OVERFLOW:
2358 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2359 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2360 exceptionInfo->ContextRecord);
2361 }
2362 break;
2363 default:
2364 break;
2365 }
2366 #endif
2367 }
2368 return EXCEPTION_CONTINUE_SEARCH;
2369 }
2371 #ifndef _WIN64
2372 // Special care for fast JNI accessors.
2373 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2374 // the heap gets shrunk before the field access.
2375 // Need to install our own structured exception handler since native code may
2376 // install its own.
2377 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2378 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2379 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2380 address pc = (address) exceptionInfo->ContextRecord->Eip;
2381 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2382 if (addr != (address)-1) {
2383 return Handle_Exception(exceptionInfo, addr);
2384 }
2385 }
2386 return EXCEPTION_CONTINUE_SEARCH;
2387 }
2389 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2390 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2391 __try { \
2392 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2393 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2394 } \
2395 return 0; \
2396 }
2398 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2399 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2400 DEFINE_FAST_GETFIELD(jchar, char, Char)
2401 DEFINE_FAST_GETFIELD(jshort, short, Short)
2402 DEFINE_FAST_GETFIELD(jint, int, Int)
2403 DEFINE_FAST_GETFIELD(jlong, long, Long)
2404 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2405 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2407 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2408 switch (type) {
2409 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2410 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2411 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2412 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2413 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2414 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2415 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2416 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2417 default: ShouldNotReachHere();
2418 }
2419 return (address)-1;
2420 }
2421 #endif
2423 // Virtual Memory
2425 int os::vm_page_size() { return os::win32::vm_page_size(); }
2426 int os::vm_allocation_granularity() {
2427 return os::win32::vm_allocation_granularity();
2428 }
2430 // Windows large page support is available on Windows 2003. In order to use
2431 // large page memory, the administrator must first assign additional privilege
2432 // to the user:
2433 // + select Control Panel -> Administrative Tools -> Local Security Policy
2434 // + select Local Policies -> User Rights Assignment
2435 // + double click "Lock pages in memory", add users and/or groups
2436 // + reboot
2437 // Note the above steps are needed for administrator as well, as administrators
2438 // by default do not have the privilege to lock pages in memory.
2439 //
2440 // Note about Windows 2003: although the API supports committing large page
2441 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2442 // scenario, I found through experiment it only uses large page if the entire
2443 // memory region is reserved and committed in a single VirtualAlloc() call.
2444 // This makes Windows large page support more or less like Solaris ISM, in
2445 // that the entire heap must be committed upfront. This probably will change
2446 // in the future, if so the code below needs to be revisited.
2448 #ifndef MEM_LARGE_PAGES
2449 #define MEM_LARGE_PAGES 0x20000000
2450 #endif
2452 // GetLargePageMinimum is only available on Windows 2003. The other functions
2453 // are available on NT but not on Windows 98/Me. We have to resolve them at
2454 // runtime.
2455 typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void);
2456 typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type)
2457 (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
2458 typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE);
2459 typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID);
2461 static GetLargePageMinimum_func_type _GetLargePageMinimum;
2462 static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges;
2463 static OpenProcessToken_func_type _OpenProcessToken;
2464 static LookupPrivilegeValue_func_type _LookupPrivilegeValue;
2466 static HINSTANCE _kernel32;
2467 static HINSTANCE _advapi32;
2468 static HANDLE _hProcess;
2469 static HANDLE _hToken;
2471 static size_t _large_page_size = 0;
2473 static bool resolve_functions_for_large_page_init() {
2474 _kernel32 = LoadLibrary("kernel32.dll");
2475 if (_kernel32 == NULL) return false;
2477 _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type,
2478 GetProcAddress(_kernel32, "GetLargePageMinimum"));
2479 if (_GetLargePageMinimum == NULL) return false;
2481 _advapi32 = LoadLibrary("advapi32.dll");
2482 if (_advapi32 == NULL) return false;
2484 _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type,
2485 GetProcAddress(_advapi32, "AdjustTokenPrivileges"));
2486 _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type,
2487 GetProcAddress(_advapi32, "OpenProcessToken"));
2488 _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type,
2489 GetProcAddress(_advapi32, "LookupPrivilegeValueA"));
2490 return _AdjustTokenPrivileges != NULL &&
2491 _OpenProcessToken != NULL &&
2492 _LookupPrivilegeValue != NULL;
2493 }
2495 static bool request_lock_memory_privilege() {
2496 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2497 os::current_process_id());
2499 LUID luid;
2500 if (_hProcess != NULL &&
2501 _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2502 _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2504 TOKEN_PRIVILEGES tp;
2505 tp.PrivilegeCount = 1;
2506 tp.Privileges[0].Luid = luid;
2507 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2509 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2510 // privilege. Check GetLastError() too. See MSDN document.
2511 if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2512 (GetLastError() == ERROR_SUCCESS)) {
2513 return true;
2514 }
2515 }
2517 return false;
2518 }
2520 static void cleanup_after_large_page_init() {
2521 _GetLargePageMinimum = NULL;
2522 _AdjustTokenPrivileges = NULL;
2523 _OpenProcessToken = NULL;
2524 _LookupPrivilegeValue = NULL;
2525 if (_kernel32) FreeLibrary(_kernel32);
2526 _kernel32 = NULL;
2527 if (_advapi32) FreeLibrary(_advapi32);
2528 _advapi32 = NULL;
2529 if (_hProcess) CloseHandle(_hProcess);
2530 _hProcess = NULL;
2531 if (_hToken) CloseHandle(_hToken);
2532 _hToken = NULL;
2533 }
2535 bool os::large_page_init() {
2536 if (!UseLargePages) return false;
2538 // print a warning if any large page related flag is specified on command line
2539 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2540 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2541 bool success = false;
2543 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2544 if (resolve_functions_for_large_page_init()) {
2545 if (request_lock_memory_privilege()) {
2546 size_t s = _GetLargePageMinimum();
2547 if (s) {
2548 #if defined(IA32) || defined(AMD64)
2549 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2550 WARN("JVM cannot use large pages bigger than 4mb.");
2551 } else {
2552 #endif
2553 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2554 _large_page_size = LargePageSizeInBytes;
2555 } else {
2556 _large_page_size = s;
2557 }
2558 success = true;
2559 #if defined(IA32) || defined(AMD64)
2560 }
2561 #endif
2562 } else {
2563 WARN("Large page is not supported by the processor.");
2564 }
2565 } else {
2566 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2567 }
2568 } else {
2569 WARN("Large page is not supported by the operating system.");
2570 }
2571 #undef WARN
2573 const size_t default_page_size = (size_t) vm_page_size();
2574 if (success && _large_page_size > default_page_size) {
2575 _page_sizes[0] = _large_page_size;
2576 _page_sizes[1] = default_page_size;
2577 _page_sizes[2] = 0;
2578 }
2580 cleanup_after_large_page_init();
2581 return success;
2582 }
2584 // On win32, one cannot release just a part of reserved memory, it's an
2585 // all or nothing deal. When we split a reservation, we must break the
2586 // reservation into two reservations.
2587 void os::split_reserved_memory(char *base, size_t size, size_t split,
2588 bool realloc) {
2589 if (size > 0) {
2590 release_memory(base, size);
2591 if (realloc) {
2592 reserve_memory(split, base);
2593 }
2594 if (size != split) {
2595 reserve_memory(size - split, base + split);
2596 }
2597 }
2598 }
2600 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
2601 assert((size_t)addr % os::vm_allocation_granularity() == 0,
2602 "reserve alignment");
2603 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
2604 char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
2605 assert(res == NULL || addr == NULL || addr == res,
2606 "Unexpected address from reserve.");
2607 return res;
2608 }
2610 // Reserve memory at an arbitrary address, only if that area is
2611 // available (and not reserved for something else).
2612 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2613 // Windows os::reserve_memory() fails of the requested address range is
2614 // not avilable.
2615 return reserve_memory(bytes, requested_addr);
2616 }
2618 size_t os::large_page_size() {
2619 return _large_page_size;
2620 }
2622 bool os::can_commit_large_page_memory() {
2623 // Windows only uses large page memory when the entire region is reserved
2624 // and committed in a single VirtualAlloc() call. This may change in the
2625 // future, but with Windows 2003 it's not possible to commit on demand.
2626 return false;
2627 }
2629 bool os::can_execute_large_page_memory() {
2630 return true;
2631 }
2633 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
2635 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
2637 if (UseLargePagesIndividualAllocation) {
2638 if (TracePageSizes && Verbose) {
2639 tty->print_cr("Reserving large pages individually.");
2640 }
2641 char * p_buf;
2642 // first reserve enough address space in advance since we want to be
2643 // able to break a single contiguous virtual address range into multiple
2644 // large page commits but WS2003 does not allow reserving large page space
2645 // so we just use 4K pages for reserve, this gives us a legal contiguous
2646 // address space. then we will deallocate that reservation, and re alloc
2647 // using large pages
2648 const size_t size_of_reserve = bytes + _large_page_size;
2649 if (bytes > size_of_reserve) {
2650 // Overflowed.
2651 warning("Individually allocated large pages failed, "
2652 "use -XX:-UseLargePagesIndividualAllocation to turn off");
2653 return NULL;
2654 }
2655 p_buf = (char *) VirtualAlloc(addr,
2656 size_of_reserve, // size of Reserve
2657 MEM_RESERVE,
2658 PAGE_READWRITE);
2659 // If reservation failed, return NULL
2660 if (p_buf == NULL) return NULL;
2662 release_memory(p_buf, bytes + _large_page_size);
2663 // round up to page boundary. If the size_of_reserve did not
2664 // overflow and the reservation did not fail, this align up
2665 // should not overflow.
2666 p_buf = (char *) align_size_up((size_t)p_buf, _large_page_size);
2668 // now go through and allocate one page at a time until all bytes are
2669 // allocated
2670 size_t bytes_remaining = align_size_up(bytes, _large_page_size);
2671 // An overflow of align_size_up() would have been caught above
2672 // in the calculation of size_of_reserve.
2673 char * next_alloc_addr = p_buf;
2675 #ifdef ASSERT
2676 // Variable for the failure injection
2677 long ran_num = os::random();
2678 size_t fail_after = ran_num % bytes;
2679 #endif
2681 while (bytes_remaining) {
2682 size_t bytes_to_rq = MIN2(bytes_remaining, _large_page_size);
2683 // Note allocate and commit
2684 char * p_new;
2686 #ifdef ASSERT
2687 bool inject_error = LargePagesIndividualAllocationInjectError &&
2688 (bytes_remaining <= fail_after);
2689 #else
2690 const bool inject_error = false;
2691 #endif
2693 if (inject_error) {
2694 p_new = NULL;
2695 } else {
2696 p_new = (char *) VirtualAlloc(next_alloc_addr,
2697 bytes_to_rq,
2698 MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES,
2699 prot);
2700 }
2702 if (p_new == NULL) {
2703 // Free any allocated pages
2704 if (next_alloc_addr > p_buf) {
2705 // Some memory was committed so release it.
2706 size_t bytes_to_release = bytes - bytes_remaining;
2707 release_memory(p_buf, bytes_to_release);
2708 }
2709 #ifdef ASSERT
2710 if (UseLargePagesIndividualAllocation &&
2711 LargePagesIndividualAllocationInjectError) {
2712 if (TracePageSizes && Verbose) {
2713 tty->print_cr("Reserving large pages individually failed.");
2714 }
2715 }
2716 #endif
2717 return NULL;
2718 }
2719 bytes_remaining -= bytes_to_rq;
2720 next_alloc_addr += bytes_to_rq;
2721 }
2723 return p_buf;
2725 } else {
2726 // normal policy just allocate it all at once
2727 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
2728 char * res = (char *)VirtualAlloc(NULL, bytes, flag, prot);
2729 return res;
2730 }
2731 }
2733 bool os::release_memory_special(char* base, size_t bytes) {
2734 return release_memory(base, bytes);
2735 }
2737 void os::print_statistics() {
2738 }
2740 bool os::commit_memory(char* addr, size_t bytes, bool exec) {
2741 if (bytes == 0) {
2742 // Don't bother the OS with noops.
2743 return true;
2744 }
2745 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
2746 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
2747 // Don't attempt to print anything if the OS call fails. We're
2748 // probably low on resources, so the print itself may cause crashes.
2749 bool result = VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) != 0;
2750 if (result != NULL && exec) {
2751 DWORD oldprot;
2752 // Windows doc says to use VirtualProtect to get execute permissions
2753 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot) != 0;
2754 } else {
2755 return result;
2756 }
2757 }
2759 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint,
2760 bool exec) {
2761 return commit_memory(addr, size, exec);
2762 }
2764 bool os::uncommit_memory(char* addr, size_t bytes) {
2765 if (bytes == 0) {
2766 // Don't bother the OS with noops.
2767 return true;
2768 }
2769 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
2770 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
2771 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0;
2772 }
2774 bool os::release_memory(char* addr, size_t bytes) {
2775 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
2776 }
2778 // Set protections specified
2779 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2780 bool is_committed) {
2781 unsigned int p = 0;
2782 switch (prot) {
2783 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
2784 case MEM_PROT_READ: p = PAGE_READONLY; break;
2785 case MEM_PROT_RW: p = PAGE_READWRITE; break;
2786 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
2787 default:
2788 ShouldNotReachHere();
2789 }
2791 DWORD old_status;
2793 // Strange enough, but on Win32 one can change protection only for committed
2794 // memory, not a big deal anyway, as bytes less or equal than 64K
2795 if (!is_committed && !commit_memory(addr, bytes, prot == MEM_PROT_RWX)) {
2796 fatal("cannot commit protection page");
2797 }
2798 // One cannot use os::guard_memory() here, as on Win32 guard page
2799 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
2800 //
2801 // Pages in the region become guard pages. Any attempt to access a guard page
2802 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
2803 // the guard page status. Guard pages thus act as a one-time access alarm.
2804 return VirtualProtect(addr, bytes, p, &old_status) != 0;
2805 }
2807 bool os::guard_memory(char* addr, size_t bytes) {
2808 DWORD old_status;
2809 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
2810 }
2812 bool os::unguard_memory(char* addr, size_t bytes) {
2813 DWORD old_status;
2814 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
2815 }
2817 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
2818 void os::free_memory(char *addr, size_t bytes) { }
2819 void os::numa_make_global(char *addr, size_t bytes) { }
2820 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
2821 bool os::numa_topology_changed() { return false; }
2822 size_t os::numa_get_groups_num() { return 1; }
2823 int os::numa_get_group_id() { return 0; }
2824 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2825 if (size > 0) {
2826 ids[0] = 0;
2827 return 1;
2828 }
2829 return 0;
2830 }
2832 bool os::get_page_info(char *start, page_info* info) {
2833 return false;
2834 }
2836 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2837 return end;
2838 }
2840 char* os::non_memory_address_word() {
2841 // Must never look like an address returned by reserve_memory,
2842 // even in its subfields (as defined by the CPU immediate fields,
2843 // if the CPU splits constants across multiple instructions).
2844 return (char*)-1;
2845 }
2847 #define MAX_ERROR_COUNT 100
2848 #define SYS_THREAD_ERROR 0xffffffffUL
2850 void os::pd_start_thread(Thread* thread) {
2851 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
2852 // Returns previous suspend state:
2853 // 0: Thread was not suspended
2854 // 1: Thread is running now
2855 // >1: Thread is still suspended.
2856 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
2857 }
2859 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2860 return ::read(fd, buf, nBytes);
2861 }
2863 class HighResolutionInterval {
2864 // The default timer resolution seems to be 10 milliseconds.
2865 // (Where is this written down?)
2866 // If someone wants to sleep for only a fraction of the default,
2867 // then we set the timer resolution down to 1 millisecond for
2868 // the duration of their interval.
2869 // We carefully set the resolution back, since otherwise we
2870 // seem to incur an overhead (3%?) that we don't need.
2871 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
2872 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
2873 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
2874 // timeBeginPeriod() if the relative error exceeded some threshold.
2875 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
2876 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
2877 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
2878 // resolution timers running.
2879 private:
2880 jlong resolution;
2881 public:
2882 HighResolutionInterval(jlong ms) {
2883 resolution = ms % 10L;
2884 if (resolution != 0) {
2885 MMRESULT result = timeBeginPeriod(1L);
2886 }
2887 }
2888 ~HighResolutionInterval() {
2889 if (resolution != 0) {
2890 MMRESULT result = timeEndPeriod(1L);
2891 }
2892 resolution = 0L;
2893 }
2894 };
2896 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
2897 jlong limit = (jlong) MAXDWORD;
2899 while(ms > limit) {
2900 int res;
2901 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
2902 return res;
2903 ms -= limit;
2904 }
2906 assert(thread == Thread::current(), "thread consistency check");
2907 OSThread* osthread = thread->osthread();
2908 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
2909 int result;
2910 if (interruptable) {
2911 assert(thread->is_Java_thread(), "must be java thread");
2912 JavaThread *jt = (JavaThread *) thread;
2913 ThreadBlockInVM tbivm(jt);
2915 jt->set_suspend_equivalent();
2916 // cleared by handle_special_suspend_equivalent_condition() or
2917 // java_suspend_self() via check_and_wait_while_suspended()
2919 HANDLE events[1];
2920 events[0] = osthread->interrupt_event();
2921 HighResolutionInterval *phri=NULL;
2922 if(!ForceTimeHighResolution)
2923 phri = new HighResolutionInterval( ms );
2924 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
2925 result = OS_TIMEOUT;
2926 } else {
2927 ResetEvent(osthread->interrupt_event());
2928 osthread->set_interrupted(false);
2929 result = OS_INTRPT;
2930 }
2931 delete phri; //if it is NULL, harmless
2933 // were we externally suspended while we were waiting?
2934 jt->check_and_wait_while_suspended();
2935 } else {
2936 assert(!thread->is_Java_thread(), "must not be java thread");
2937 Sleep((long) ms);
2938 result = OS_TIMEOUT;
2939 }
2940 return result;
2941 }
2943 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2944 void os::infinite_sleep() {
2945 while (true) { // sleep forever ...
2946 Sleep(100000); // ... 100 seconds at a time
2947 }
2948 }
2950 typedef BOOL (WINAPI * STTSignature)(void) ;
2952 os::YieldResult os::NakedYield() {
2953 // Use either SwitchToThread() or Sleep(0)
2954 // Consider passing back the return value from SwitchToThread().
2955 // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread.
2956 // In that case we revert to Sleep(0).
2957 static volatile STTSignature stt = (STTSignature) 1 ;
2959 if (stt == ((STTSignature) 1)) {
2960 stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ;
2961 // It's OK if threads race during initialization as the operation above is idempotent.
2962 }
2963 if (stt != NULL) {
2964 return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
2965 } else {
2966 Sleep (0) ;
2967 }
2968 return os::YIELD_UNKNOWN ;
2969 }
2971 void os::yield() { os::NakedYield(); }
2973 void os::yield_all(int attempts) {
2974 // Yields to all threads, including threads with lower priorities
2975 Sleep(1);
2976 }
2978 // Win32 only gives you access to seven real priorities at a time,
2979 // so we compress Java's ten down to seven. It would be better
2980 // if we dynamically adjusted relative priorities.
2982 int os::java_to_os_priority[MaxPriority + 1] = {
2983 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
2984 THREAD_PRIORITY_LOWEST, // 1 MinPriority
2985 THREAD_PRIORITY_LOWEST, // 2
2986 THREAD_PRIORITY_BELOW_NORMAL, // 3
2987 THREAD_PRIORITY_BELOW_NORMAL, // 4
2988 THREAD_PRIORITY_NORMAL, // 5 NormPriority
2989 THREAD_PRIORITY_NORMAL, // 6
2990 THREAD_PRIORITY_ABOVE_NORMAL, // 7
2991 THREAD_PRIORITY_ABOVE_NORMAL, // 8
2992 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
2993 THREAD_PRIORITY_HIGHEST // 10 MaxPriority
2994 };
2996 int prio_policy1[MaxPriority + 1] = {
2997 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
2998 THREAD_PRIORITY_LOWEST, // 1 MinPriority
2999 THREAD_PRIORITY_LOWEST, // 2
3000 THREAD_PRIORITY_BELOW_NORMAL, // 3
3001 THREAD_PRIORITY_BELOW_NORMAL, // 4
3002 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3003 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3004 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3005 THREAD_PRIORITY_HIGHEST, // 8
3006 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3007 THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority
3008 };
3010 static int prio_init() {
3011 // If ThreadPriorityPolicy is 1, switch tables
3012 if (ThreadPriorityPolicy == 1) {
3013 int i;
3014 for (i = 0; i < MaxPriority + 1; i++) {
3015 os::java_to_os_priority[i] = prio_policy1[i];
3016 }
3017 }
3018 return 0;
3019 }
3021 OSReturn os::set_native_priority(Thread* thread, int priority) {
3022 if (!UseThreadPriorities) return OS_OK;
3023 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3024 return ret ? OS_OK : OS_ERR;
3025 }
3027 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3028 if ( !UseThreadPriorities ) {
3029 *priority_ptr = java_to_os_priority[NormPriority];
3030 return OS_OK;
3031 }
3032 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3033 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3034 assert(false, "GetThreadPriority failed");
3035 return OS_ERR;
3036 }
3037 *priority_ptr = os_prio;
3038 return OS_OK;
3039 }
3042 // Hint to the underlying OS that a task switch would not be good.
3043 // Void return because it's a hint and can fail.
3044 void os::hint_no_preempt() {}
3046 void os::interrupt(Thread* thread) {
3047 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3048 "possibility of dangling Thread pointer");
3050 OSThread* osthread = thread->osthread();
3051 osthread->set_interrupted(true);
3052 // More than one thread can get here with the same value of osthread,
3053 // resulting in multiple notifications. We do, however, want the store
3054 // to interrupted() to be visible to other threads before we post
3055 // the interrupt event.
3056 OrderAccess::release();
3057 SetEvent(osthread->interrupt_event());
3058 // For JSR166: unpark after setting status
3059 if (thread->is_Java_thread())
3060 ((JavaThread*)thread)->parker()->unpark();
3062 ParkEvent * ev = thread->_ParkEvent ;
3063 if (ev != NULL) ev->unpark() ;
3065 }
3068 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3069 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3070 "possibility of dangling Thread pointer");
3072 OSThread* osthread = thread->osthread();
3073 bool interrupted;
3074 interrupted = osthread->interrupted();
3075 if (clear_interrupted == true) {
3076 osthread->set_interrupted(false);
3077 ResetEvent(osthread->interrupt_event());
3078 } // Otherwise leave the interrupted state alone
3080 return interrupted;
3081 }
3083 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3084 ExtendedPC os::get_thread_pc(Thread* thread) {
3085 CONTEXT context;
3086 context.ContextFlags = CONTEXT_CONTROL;
3087 HANDLE handle = thread->osthread()->thread_handle();
3088 #ifdef _M_IA64
3089 assert(0, "Fix get_thread_pc");
3090 return ExtendedPC(NULL);
3091 #else
3092 if (GetThreadContext(handle, &context)) {
3093 #ifdef _M_AMD64
3094 return ExtendedPC((address) context.Rip);
3095 #else
3096 return ExtendedPC((address) context.Eip);
3097 #endif
3098 } else {
3099 return ExtendedPC(NULL);
3100 }
3101 #endif
3102 }
3104 // GetCurrentThreadId() returns DWORD
3105 intx os::current_thread_id() { return GetCurrentThreadId(); }
3107 static int _initial_pid = 0;
3109 int os::current_process_id()
3110 {
3111 return (_initial_pid ? _initial_pid : _getpid());
3112 }
3114 int os::win32::_vm_page_size = 0;
3115 int os::win32::_vm_allocation_granularity = 0;
3116 int os::win32::_processor_type = 0;
3117 // Processor level is not available on non-NT systems, use vm_version instead
3118 int os::win32::_processor_level = 0;
3119 julong os::win32::_physical_memory = 0;
3120 size_t os::win32::_default_stack_size = 0;
3122 intx os::win32::_os_thread_limit = 0;
3123 volatile intx os::win32::_os_thread_count = 0;
3125 bool os::win32::_is_nt = false;
3126 bool os::win32::_is_windows_2003 = false;
3129 void os::win32::initialize_system_info() {
3130 SYSTEM_INFO si;
3131 GetSystemInfo(&si);
3132 _vm_page_size = si.dwPageSize;
3133 _vm_allocation_granularity = si.dwAllocationGranularity;
3134 _processor_type = si.dwProcessorType;
3135 _processor_level = si.wProcessorLevel;
3136 _processor_count = si.dwNumberOfProcessors;
3138 MEMORYSTATUS ms;
3139 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3140 // dwMemoryLoad (% of memory in use)
3141 GlobalMemoryStatus(&ms);
3142 _physical_memory = ms.dwTotalPhys;
3144 OSVERSIONINFO oi;
3145 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
3146 GetVersionEx(&oi);
3147 switch(oi.dwPlatformId) {
3148 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3149 case VER_PLATFORM_WIN32_NT:
3150 _is_nt = true;
3151 {
3152 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3153 if (os_vers == 5002) {
3154 _is_windows_2003 = true;
3155 }
3156 }
3157 break;
3158 default: fatal("Unknown platform");
3159 }
3161 _default_stack_size = os::current_stack_size();
3162 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3163 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3164 "stack size not a multiple of page size");
3166 initialize_performance_counter();
3168 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3169 // known to deadlock the system, if the VM issues to thread operations with
3170 // a too high frequency, e.g., such as changing the priorities.
3171 // The 6000 seems to work well - no deadlocks has been notices on the test
3172 // programs that we have seen experience this problem.
3173 if (!os::win32::is_nt()) {
3174 StarvationMonitorInterval = 6000;
3175 }
3176 }
3179 void os::win32::setmode_streams() {
3180 _setmode(_fileno(stdin), _O_BINARY);
3181 _setmode(_fileno(stdout), _O_BINARY);
3182 _setmode(_fileno(stderr), _O_BINARY);
3183 }
3186 int os::message_box(const char* title, const char* message) {
3187 int result = MessageBox(NULL, message, title,
3188 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3189 return result == IDYES;
3190 }
3192 int os::allocate_thread_local_storage() {
3193 return TlsAlloc();
3194 }
3197 void os::free_thread_local_storage(int index) {
3198 TlsFree(index);
3199 }
3202 void os::thread_local_storage_at_put(int index, void* value) {
3203 TlsSetValue(index, value);
3204 assert(thread_local_storage_at(index) == value, "Just checking");
3205 }
3208 void* os::thread_local_storage_at(int index) {
3209 return TlsGetValue(index);
3210 }
3213 #ifndef PRODUCT
3214 #ifndef _WIN64
3215 // Helpers to check whether NX protection is enabled
3216 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3217 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3218 pex->ExceptionRecord->NumberParameters > 0 &&
3219 pex->ExceptionRecord->ExceptionInformation[0] ==
3220 EXCEPTION_INFO_EXEC_VIOLATION) {
3221 return EXCEPTION_EXECUTE_HANDLER;
3222 }
3223 return EXCEPTION_CONTINUE_SEARCH;
3224 }
3226 void nx_check_protection() {
3227 // If NX is enabled we'll get an exception calling into code on the stack
3228 char code[] = { (char)0xC3 }; // ret
3229 void *code_ptr = (void *)code;
3230 __try {
3231 __asm call code_ptr
3232 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3233 tty->print_raw_cr("NX protection detected.");
3234 }
3235 }
3236 #endif // _WIN64
3237 #endif // PRODUCT
3239 // this is called _before_ the global arguments have been parsed
3240 void os::init(void) {
3241 _initial_pid = _getpid();
3243 init_random(1234567);
3245 win32::initialize_system_info();
3246 win32::setmode_streams();
3247 init_page_sizes((size_t) win32::vm_page_size());
3249 // For better scalability on MP systems (must be called after initialize_system_info)
3250 #ifndef PRODUCT
3251 if (is_MP()) {
3252 NoYieldsInMicrolock = true;
3253 }
3254 #endif
3255 // This may be overridden later when argument processing is done.
3256 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3257 os::win32::is_windows_2003());
3259 // Initialize main_process and main_thread
3260 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3261 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3262 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3263 fatal("DuplicateHandle failed\n");
3264 }
3265 main_thread_id = (int) GetCurrentThreadId();
3266 }
3268 // To install functions for atexit processing
3269 extern "C" {
3270 static void perfMemory_exit_helper() {
3271 perfMemory_exit();
3272 }
3273 }
3276 // this is called _after_ the global arguments have been parsed
3277 jint os::init_2(void) {
3278 // Allocate a single page and mark it as readable for safepoint polling
3279 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3280 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3282 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3283 guarantee( return_page != NULL, "Commit Failed for polling page");
3285 os::set_polling_page( polling_page );
3287 #ifndef PRODUCT
3288 if( Verbose && PrintMiscellaneous )
3289 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3290 #endif
3292 if (!UseMembar) {
3293 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3294 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3296 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3297 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3299 os::set_memory_serialize_page( mem_serialize_page );
3301 #ifndef PRODUCT
3302 if(Verbose && PrintMiscellaneous)
3303 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3304 #endif
3305 }
3307 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init());
3309 // Setup Windows Exceptions
3311 // On Itanium systems, Structured Exception Handling does not
3312 // work since stack frames must be walkable by the OS. Since
3313 // much of our code is dynamically generated, and we do not have
3314 // proper unwind .xdata sections, the system simply exits
3315 // rather than delivering the exception. To work around
3316 // this we use VectorExceptions instead.
3317 #ifdef _WIN64
3318 if (UseVectoredExceptions) {
3319 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter);
3320 }
3321 #endif
3323 // for debugging float code generation bugs
3324 if (ForceFloatExceptions) {
3325 #ifndef _WIN64
3326 static long fp_control_word = 0;
3327 __asm { fstcw fp_control_word }
3328 // see Intel PPro Manual, Vol. 2, p 7-16
3329 const long precision = 0x20;
3330 const long underflow = 0x10;
3331 const long overflow = 0x08;
3332 const long zero_div = 0x04;
3333 const long denorm = 0x02;
3334 const long invalid = 0x01;
3335 fp_control_word |= invalid;
3336 __asm { fldcw fp_control_word }
3337 #endif
3338 }
3340 // Initialize HPI.
3341 jint hpi_result = hpi::initialize();
3342 if (hpi_result != JNI_OK) { return hpi_result; }
3344 // If stack_commit_size is 0, windows will reserve the default size,
3345 // but only commit a small portion of it.
3346 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3347 size_t default_reserve_size = os::win32::default_stack_size();
3348 size_t actual_reserve_size = stack_commit_size;
3349 if (stack_commit_size < default_reserve_size) {
3350 // If stack_commit_size == 0, we want this too
3351 actual_reserve_size = default_reserve_size;
3352 }
3354 JavaThread::set_stack_size_at_create(stack_commit_size);
3356 // Calculate theoretical max. size of Threads to guard gainst artifical
3357 // out-of-memory situations, where all available address-space has been
3358 // reserved by thread stacks.
3359 assert(actual_reserve_size != 0, "Must have a stack");
3361 // Calculate the thread limit when we should start doing Virtual Memory
3362 // banging. Currently when the threads will have used all but 200Mb of space.
3363 //
3364 // TODO: consider performing a similar calculation for commit size instead
3365 // as reserve size, since on a 64-bit platform we'll run into that more
3366 // often than running out of virtual memory space. We can use the
3367 // lower value of the two calculations as the os_thread_limit.
3368 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3369 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3371 // at exit methods are called in the reverse order of their registration.
3372 // there is no limit to the number of functions registered. atexit does
3373 // not set errno.
3375 if (PerfAllowAtExitRegistration) {
3376 // only register atexit functions if PerfAllowAtExitRegistration is set.
3377 // atexit functions can be delayed until process exit time, which
3378 // can be problematic for embedded VM situations. Embedded VMs should
3379 // call DestroyJavaVM() to assure that VM resources are released.
3381 // note: perfMemory_exit_helper atexit function may be removed in
3382 // the future if the appropriate cleanup code can be added to the
3383 // VM_Exit VMOperation's doit method.
3384 if (atexit(perfMemory_exit_helper) != 0) {
3385 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3386 }
3387 }
3389 // initialize PSAPI or ToolHelp for fatal error handler
3390 if (win32::is_nt()) _init_psapi();
3391 else _init_toolhelp();
3393 #ifndef _WIN64
3394 // Print something if NX is enabled (win32 on AMD64)
3395 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
3396 #endif
3398 // initialize thread priority policy
3399 prio_init();
3401 if (UseNUMA && !ForceNUMA) {
3402 UseNUMA = false; // Currently unsupported.
3403 }
3405 return JNI_OK;
3406 }
3409 // Mark the polling page as unreadable
3410 void os::make_polling_page_unreadable(void) {
3411 DWORD old_status;
3412 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
3413 fatal("Could not disable polling page");
3414 };
3416 // Mark the polling page as readable
3417 void os::make_polling_page_readable(void) {
3418 DWORD old_status;
3419 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
3420 fatal("Could not enable polling page");
3421 };
3424 int os::stat(const char *path, struct stat *sbuf) {
3425 char pathbuf[MAX_PATH];
3426 if (strlen(path) > MAX_PATH - 1) {
3427 errno = ENAMETOOLONG;
3428 return -1;
3429 }
3430 hpi::native_path(strcpy(pathbuf, path));
3431 int ret = ::stat(pathbuf, sbuf);
3432 if (sbuf != NULL && UseUTCFileTimestamp) {
3433 // Fix for 6539723. st_mtime returned from stat() is dependent on
3434 // the system timezone and so can return different values for the
3435 // same file if/when daylight savings time changes. This adjustment
3436 // makes sure the same timestamp is returned regardless of the TZ.
3437 //
3438 // See:
3439 // http://msdn.microsoft.com/library/
3440 // default.asp?url=/library/en-us/sysinfo/base/
3441 // time_zone_information_str.asp
3442 // and
3443 // http://msdn.microsoft.com/library/default.asp?url=
3444 // /library/en-us/sysinfo/base/settimezoneinformation.asp
3445 //
3446 // NOTE: there is a insidious bug here: If the timezone is changed
3447 // after the call to stat() but before 'GetTimeZoneInformation()', then
3448 // the adjustment we do here will be wrong and we'll return the wrong
3449 // value (which will likely end up creating an invalid class data
3450 // archive). Absent a better API for this, or some time zone locking
3451 // mechanism, we'll have to live with this risk.
3452 TIME_ZONE_INFORMATION tz;
3453 DWORD tzid = GetTimeZoneInformation(&tz);
3454 int daylightBias =
3455 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
3456 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
3457 }
3458 return ret;
3459 }
3462 #define FT2INT64(ft) \
3463 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
3466 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3467 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3468 // of a thread.
3469 //
3470 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3471 // the fast estimate available on the platform.
3473 // current_thread_cpu_time() is not optimized for Windows yet
3474 jlong os::current_thread_cpu_time() {
3475 // return user + sys since the cost is the same
3476 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
3477 }
3479 jlong os::thread_cpu_time(Thread* thread) {
3480 // consistent with what current_thread_cpu_time() returns.
3481 return os::thread_cpu_time(thread, true /* user+sys */);
3482 }
3484 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3485 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3486 }
3488 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
3489 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
3490 // If this function changes, os::is_thread_cpu_time_supported() should too
3491 if (os::win32::is_nt()) {
3492 FILETIME CreationTime;
3493 FILETIME ExitTime;
3494 FILETIME KernelTime;
3495 FILETIME UserTime;
3497 if ( GetThreadTimes(thread->osthread()->thread_handle(),
3498 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3499 return -1;
3500 else
3501 if (user_sys_cpu_time) {
3502 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
3503 } else {
3504 return FT2INT64(UserTime) * 100;
3505 }
3506 } else {
3507 return (jlong) timeGetTime() * 1000000;
3508 }
3509 }
3511 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3512 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3513 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3514 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3515 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3516 }
3518 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3519 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3520 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3521 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3522 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3523 }
3525 bool os::is_thread_cpu_time_supported() {
3526 // see os::thread_cpu_time
3527 if (os::win32::is_nt()) {
3528 FILETIME CreationTime;
3529 FILETIME ExitTime;
3530 FILETIME KernelTime;
3531 FILETIME UserTime;
3533 if ( GetThreadTimes(GetCurrentThread(),
3534 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3535 return false;
3536 else
3537 return true;
3538 } else {
3539 return false;
3540 }
3541 }
3543 // Windows does't provide a loadavg primitive so this is stubbed out for now.
3544 // It does have primitives (PDH API) to get CPU usage and run queue length.
3545 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
3546 // If we wanted to implement loadavg on Windows, we have a few options:
3547 //
3548 // a) Query CPU usage and run queue length and "fake" an answer by
3549 // returning the CPU usage if it's under 100%, and the run queue
3550 // length otherwise. It turns out that querying is pretty slow
3551 // on Windows, on the order of 200 microseconds on a fast machine.
3552 // Note that on the Windows the CPU usage value is the % usage
3553 // since the last time the API was called (and the first call
3554 // returns 100%), so we'd have to deal with that as well.
3555 //
3556 // b) Sample the "fake" answer using a sampling thread and store
3557 // the answer in a global variable. The call to loadavg would
3558 // just return the value of the global, avoiding the slow query.
3559 //
3560 // c) Sample a better answer using exponential decay to smooth the
3561 // value. This is basically the algorithm used by UNIX kernels.
3562 //
3563 // Note that sampling thread starvation could affect both (b) and (c).
3564 int os::loadavg(double loadavg[], int nelem) {
3565 return -1;
3566 }
3569 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
3570 bool os::dont_yield() {
3571 return DontYieldALot;
3572 }
3574 // Is a (classpath) directory empty?
3575 bool os::dir_is_empty(const char* path) {
3576 WIN32_FIND_DATA fd;
3577 HANDLE f = FindFirstFile(path, &fd);
3578 if (f == INVALID_HANDLE_VALUE) {
3579 return true;
3580 }
3581 FindClose(f);
3582 return false;
3583 }
3585 // create binary file, rewriting existing file if required
3586 int os::create_binary_file(const char* path, bool rewrite_existing) {
3587 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
3588 if (!rewrite_existing) {
3589 oflags |= _O_EXCL;
3590 }
3591 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
3592 }
3594 // return current position of file pointer
3595 jlong os::current_file_offset(int fd) {
3596 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
3597 }
3599 // move file pointer to the specified offset
3600 jlong os::seek_to_file_offset(int fd, jlong offset) {
3601 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
3602 }
3605 // Map a block of memory.
3606 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
3607 char *addr, size_t bytes, bool read_only,
3608 bool allow_exec) {
3609 HANDLE hFile;
3610 char* base;
3612 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
3613 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
3614 if (hFile == NULL) {
3615 if (PrintMiscellaneous && Verbose) {
3616 DWORD err = GetLastError();
3617 tty->print_cr("CreateFile() failed: GetLastError->%ld.");
3618 }
3619 return NULL;
3620 }
3622 if (allow_exec) {
3623 // CreateFileMapping/MapViewOfFileEx can't map executable memory
3624 // unless it comes from a PE image (which the shared archive is not.)
3625 // Even VirtualProtect refuses to give execute access to mapped memory
3626 // that was not previously executable.
3627 //
3628 // Instead, stick the executable region in anonymous memory. Yuck.
3629 // Penalty is that ~4 pages will not be shareable - in the future
3630 // we might consider DLLizing the shared archive with a proper PE
3631 // header so that mapping executable + sharing is possible.
3633 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
3634 PAGE_READWRITE);
3635 if (base == NULL) {
3636 if (PrintMiscellaneous && Verbose) {
3637 DWORD err = GetLastError();
3638 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
3639 }
3640 CloseHandle(hFile);
3641 return NULL;
3642 }
3644 DWORD bytes_read;
3645 OVERLAPPED overlapped;
3646 overlapped.Offset = (DWORD)file_offset;
3647 overlapped.OffsetHigh = 0;
3648 overlapped.hEvent = NULL;
3649 // ReadFile guarantees that if the return value is true, the requested
3650 // number of bytes were read before returning.
3651 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
3652 if (!res) {
3653 if (PrintMiscellaneous && Verbose) {
3654 DWORD err = GetLastError();
3655 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
3656 }
3657 release_memory(base, bytes);
3658 CloseHandle(hFile);
3659 return NULL;
3660 }
3661 } else {
3662 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
3663 NULL /*file_name*/);
3664 if (hMap == NULL) {
3665 if (PrintMiscellaneous && Verbose) {
3666 DWORD err = GetLastError();
3667 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.");
3668 }
3669 CloseHandle(hFile);
3670 return NULL;
3671 }
3673 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
3674 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
3675 (DWORD)bytes, addr);
3676 if (base == NULL) {
3677 if (PrintMiscellaneous && Verbose) {
3678 DWORD err = GetLastError();
3679 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
3680 }
3681 CloseHandle(hMap);
3682 CloseHandle(hFile);
3683 return NULL;
3684 }
3686 if (CloseHandle(hMap) == 0) {
3687 if (PrintMiscellaneous && Verbose) {
3688 DWORD err = GetLastError();
3689 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
3690 }
3691 CloseHandle(hFile);
3692 return base;
3693 }
3694 }
3696 if (allow_exec) {
3697 DWORD old_protect;
3698 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
3699 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
3701 if (!res) {
3702 if (PrintMiscellaneous && Verbose) {
3703 DWORD err = GetLastError();
3704 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
3705 }
3706 // Don't consider this a hard error, on IA32 even if the
3707 // VirtualProtect fails, we should still be able to execute
3708 CloseHandle(hFile);
3709 return base;
3710 }
3711 }
3713 if (CloseHandle(hFile) == 0) {
3714 if (PrintMiscellaneous && Verbose) {
3715 DWORD err = GetLastError();
3716 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
3717 }
3718 return base;
3719 }
3721 return base;
3722 }
3725 // Remap a block of memory.
3726 char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
3727 char *addr, size_t bytes, bool read_only,
3728 bool allow_exec) {
3729 // This OS does not allow existing memory maps to be remapped so we
3730 // have to unmap the memory before we remap it.
3731 if (!os::unmap_memory(addr, bytes)) {
3732 return NULL;
3733 }
3735 // There is a very small theoretical window between the unmap_memory()
3736 // call above and the map_memory() call below where a thread in native
3737 // code may be able to access an address that is no longer mapped.
3739 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3740 allow_exec);
3741 }
3744 // Unmap a block of memory.
3745 // Returns true=success, otherwise false.
3747 bool os::unmap_memory(char* addr, size_t bytes) {
3748 BOOL result = UnmapViewOfFile(addr);
3749 if (result == 0) {
3750 if (PrintMiscellaneous && Verbose) {
3751 DWORD err = GetLastError();
3752 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
3753 }
3754 return false;
3755 }
3756 return true;
3757 }
3759 void os::pause() {
3760 char filename[MAX_PATH];
3761 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3762 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
3763 } else {
3764 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3765 }
3767 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3768 if (fd != -1) {
3769 struct stat buf;
3770 close(fd);
3771 while (::stat(filename, &buf) == 0) {
3772 Sleep(100);
3773 }
3774 } else {
3775 jio_fprintf(stderr,
3776 "Could not open pause file '%s', continuing immediately.\n", filename);
3777 }
3778 }
3780 // An Event wraps a win32 "CreateEvent" kernel handle.
3781 //
3782 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
3783 //
3784 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
3785 // field, and call CloseHandle() on the win32 event handle. Unpark() would
3786 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
3787 // In addition, an unpark() operation might fetch the handle field, but the
3788 // event could recycle between the fetch and the SetEvent() operation.
3789 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
3790 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
3791 // on an stale but recycled handle would be harmless, but in practice this might
3792 // confuse other non-Sun code, so it's not a viable approach.
3793 //
3794 // 2: Once a win32 event handle is associated with an Event, it remains associated
3795 // with the Event. The event handle is never closed. This could be construed
3796 // as handle leakage, but only up to the maximum # of threads that have been extant
3797 // at any one time. This shouldn't be an issue, as windows platforms typically
3798 // permit a process to have hundreds of thousands of open handles.
3799 //
3800 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
3801 // and release unused handles.
3802 //
3803 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
3804 // It's not clear, however, that we wouldn't be trading one type of leak for another.
3805 //
3806 // 5. Use an RCU-like mechanism (Read-Copy Update).
3807 // Or perhaps something similar to Maged Michael's "Hazard pointers".
3808 //
3809 // We use (2).
3810 //
3811 // TODO-FIXME:
3812 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
3813 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
3814 // to recover from (or at least detect) the dreaded Windows 841176 bug.
3815 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
3816 // into a single win32 CreateEvent() handle.
3817 //
3818 // _Event transitions in park()
3819 // -1 => -1 : illegal
3820 // 1 => 0 : pass - return immediately
3821 // 0 => -1 : block
3822 //
3823 // _Event serves as a restricted-range semaphore :
3824 // -1 : thread is blocked
3825 // 0 : neutral - thread is running or ready
3826 // 1 : signaled - thread is running or ready
3827 //
3828 // Another possible encoding of _Event would be
3829 // with explicit "PARKED" and "SIGNALED" bits.
3831 int os::PlatformEvent::park (jlong Millis) {
3832 guarantee (_ParkHandle != NULL , "Invariant") ;
3833 guarantee (Millis > 0 , "Invariant") ;
3834 int v ;
3836 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
3837 // the initial park() operation.
3839 for (;;) {
3840 v = _Event ;
3841 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
3842 }
3843 guarantee ((v == 0) || (v == 1), "invariant") ;
3844 if (v != 0) return OS_OK ;
3846 // Do this the hard way by blocking ...
3847 // TODO: consider a brief spin here, gated on the success of recent
3848 // spin attempts by this thread.
3849 //
3850 // We decompose long timeouts into series of shorter timed waits.
3851 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
3852 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
3853 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
3854 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
3855 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
3856 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
3857 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
3858 // for the already waited time. This policy does not admit any new outcomes.
3859 // In the future, however, we might want to track the accumulated wait time and
3860 // adjust Millis accordingly if we encounter a spurious wakeup.
3862 const int MAXTIMEOUT = 0x10000000 ;
3863 DWORD rv = WAIT_TIMEOUT ;
3864 while (_Event < 0 && Millis > 0) {
3865 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
3866 if (Millis > MAXTIMEOUT) {
3867 prd = MAXTIMEOUT ;
3868 }
3869 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
3870 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
3871 if (rv == WAIT_TIMEOUT) {
3872 Millis -= prd ;
3873 }
3874 }
3875 v = _Event ;
3876 _Event = 0 ;
3877 OrderAccess::fence() ;
3878 // If we encounter a nearly simultanous timeout expiry and unpark()
3879 // we return OS_OK indicating we awoke via unpark().
3880 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
3881 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
3882 }
3884 void os::PlatformEvent::park () {
3885 guarantee (_ParkHandle != NULL, "Invariant") ;
3886 // Invariant: Only the thread associated with the Event/PlatformEvent
3887 // may call park().
3888 int v ;
3889 for (;;) {
3890 v = _Event ;
3891 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
3892 }
3893 guarantee ((v == 0) || (v == 1), "invariant") ;
3894 if (v != 0) return ;
3896 // Do this the hard way by blocking ...
3897 // TODO: consider a brief spin here, gated on the success of recent
3898 // spin attempts by this thread.
3899 while (_Event < 0) {
3900 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
3901 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
3902 }
3904 // Usually we'll find _Event == 0 at this point, but as
3905 // an optional optimization we clear it, just in case can
3906 // multiple unpark() operations drove _Event up to 1.
3907 _Event = 0 ;
3908 OrderAccess::fence() ;
3909 guarantee (_Event >= 0, "invariant") ;
3910 }
3912 void os::PlatformEvent::unpark() {
3913 guarantee (_ParkHandle != NULL, "Invariant") ;
3914 int v ;
3915 for (;;) {
3916 v = _Event ; // Increment _Event if it's < 1.
3917 if (v > 0) {
3918 // If it's already signaled just return.
3919 // The LD of _Event could have reordered or be satisfied
3920 // by a read-aside from this processor's write buffer.
3921 // To avoid problems execute a barrier and then
3922 // ratify the value. A degenerate CAS() would also work.
3923 // Viz., CAS (v+0, &_Event, v) == v).
3924 OrderAccess::fence() ;
3925 if (_Event == v) return ;
3926 continue ;
3927 }
3928 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
3929 }
3930 if (v < 0) {
3931 ::SetEvent (_ParkHandle) ;
3932 }
3933 }
3936 // JSR166
3937 // -------------------------------------------------------
3939 /*
3940 * The Windows implementation of Park is very straightforward: Basic
3941 * operations on Win32 Events turn out to have the right semantics to
3942 * use them directly. We opportunistically resuse the event inherited
3943 * from Monitor.
3944 */
3947 void Parker::park(bool isAbsolute, jlong time) {
3948 guarantee (_ParkEvent != NULL, "invariant") ;
3949 // First, demultiplex/decode time arguments
3950 if (time < 0) { // don't wait
3951 return;
3952 }
3953 else if (time == 0) {
3954 time = INFINITE;
3955 }
3956 else if (isAbsolute) {
3957 time -= os::javaTimeMillis(); // convert to relative time
3958 if (time <= 0) // already elapsed
3959 return;
3960 }
3961 else { // relative
3962 time /= 1000000; // Must coarsen from nanos to millis
3963 if (time == 0) // Wait for the minimal time unit if zero
3964 time = 1;
3965 }
3967 JavaThread* thread = (JavaThread*)(Thread::current());
3968 assert(thread->is_Java_thread(), "Must be JavaThread");
3969 JavaThread *jt = (JavaThread *)thread;
3971 // Don't wait if interrupted or already triggered
3972 if (Thread::is_interrupted(thread, false) ||
3973 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
3974 ResetEvent(_ParkEvent);
3975 return;
3976 }
3977 else {
3978 ThreadBlockInVM tbivm(jt);
3979 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3980 jt->set_suspend_equivalent();
3982 WaitForSingleObject(_ParkEvent, time);
3983 ResetEvent(_ParkEvent);
3985 // If externally suspended while waiting, re-suspend
3986 if (jt->handle_special_suspend_equivalent_condition()) {
3987 jt->java_suspend_self();
3988 }
3989 }
3990 }
3992 void Parker::unpark() {
3993 guarantee (_ParkEvent != NULL, "invariant") ;
3994 SetEvent(_ParkEvent);
3995 }
3997 // Run the specified command in a separate process. Return its exit value,
3998 // or -1 on failure (e.g. can't create a new process).
3999 int os::fork_and_exec(char* cmd) {
4000 STARTUPINFO si;
4001 PROCESS_INFORMATION pi;
4003 memset(&si, 0, sizeof(si));
4004 si.cb = sizeof(si);
4005 memset(&pi, 0, sizeof(pi));
4006 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4007 cmd, // command line
4008 NULL, // process security attribute
4009 NULL, // thread security attribute
4010 TRUE, // inherits system handles
4011 0, // no creation flags
4012 NULL, // use parent's environment block
4013 NULL, // use parent's starting directory
4014 &si, // (in) startup information
4015 &pi); // (out) process information
4017 if (rslt) {
4018 // Wait until child process exits.
4019 WaitForSingleObject(pi.hProcess, INFINITE);
4021 DWORD exit_code;
4022 GetExitCodeProcess(pi.hProcess, &exit_code);
4024 // Close process and thread handles.
4025 CloseHandle(pi.hProcess);
4026 CloseHandle(pi.hThread);
4028 return (int)exit_code;
4029 } else {
4030 return -1;
4031 }
4032 }
4034 //--------------------------------------------------------------------------------------------------
4035 // Non-product code
4037 static int mallocDebugIntervalCounter = 0;
4038 static int mallocDebugCounter = 0;
4039 bool os::check_heap(bool force) {
4040 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
4041 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
4042 // Note: HeapValidate executes two hardware breakpoints when it finds something
4043 // wrong; at these points, eax contains the address of the offending block (I think).
4044 // To get to the exlicit error message(s) below, just continue twice.
4045 HANDLE heap = GetProcessHeap();
4046 { HeapLock(heap);
4047 PROCESS_HEAP_ENTRY phe;
4048 phe.lpData = NULL;
4049 while (HeapWalk(heap, &phe) != 0) {
4050 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
4051 !HeapValidate(heap, 0, phe.lpData)) {
4052 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
4053 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
4054 fatal("corrupted C heap");
4055 }
4056 }
4057 int err = GetLastError();
4058 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
4059 fatal1("heap walk aborted with error %d", err);
4060 }
4061 HeapUnlock(heap);
4062 }
4063 mallocDebugIntervalCounter = 0;
4064 }
4065 return true;
4066 }
4069 #ifndef PRODUCT
4070 bool os::find(address addr) {
4071 // Nothing yet
4072 return false;
4073 }
4074 #endif
4076 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
4077 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
4079 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
4080 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
4081 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
4082 address addr = (address) exceptionRecord->ExceptionInformation[1];
4084 if (os::is_memory_serialize_page(thread, addr))
4085 return EXCEPTION_CONTINUE_EXECUTION;
4086 }
4088 return EXCEPTION_CONTINUE_SEARCH;
4089 }
4091 static int getLastErrorString(char *buf, size_t len)
4092 {
4093 long errval;
4095 if ((errval = GetLastError()) != 0)
4096 {
4097 /* DOS error */
4098 size_t n = (size_t)FormatMessage(
4099 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
4100 NULL,
4101 errval,
4102 0,
4103 buf,
4104 (DWORD)len,
4105 NULL);
4106 if (n > 3) {
4107 /* Drop final '.', CR, LF */
4108 if (buf[n - 1] == '\n') n--;
4109 if (buf[n - 1] == '\r') n--;
4110 if (buf[n - 1] == '.') n--;
4111 buf[n] = '\0';
4112 }
4113 return (int)n;
4114 }
4116 if (errno != 0)
4117 {
4118 /* C runtime error that has no corresponding DOS error code */
4119 const char *s = strerror(errno);
4120 size_t n = strlen(s);
4121 if (n >= len) n = len - 1;
4122 strncpy(buf, s, n);
4123 buf[n] = '\0';
4124 return (int)n;
4125 }
4126 return 0;
4127 }