Wed, 02 Jul 2008 12:55:16 -0700
6719955: Update copyright year
Summary: Update copyright year for files that have been modified in 2008
Reviewed-by: ohair, tbell
1 /*
2 * Copyright 1997-2008 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 }
331 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
333 // Thread start routine for all new Java threads
334 static unsigned __stdcall java_start(Thread* thread) {
335 // Try to randomize the cache line index of hot stack frames.
336 // This helps when threads of the same stack traces evict each other's
337 // cache lines. The threads can be either from the same JVM instance, or
338 // from different JVM instances. The benefit is especially true for
339 // processors with hyperthreading technology.
340 static int counter = 0;
341 int pid = os::current_process_id();
342 _alloca(((pid ^ counter++) & 7) * 128);
344 OSThread* osthr = thread->osthread();
345 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
347 if (UseNUMA) {
348 int lgrp_id = os::numa_get_group_id();
349 if (lgrp_id != -1) {
350 thread->set_lgrp_id(lgrp_id);
351 }
352 }
355 if (UseVectoredExceptions) {
356 // If we are using vectored exception we don't need to set a SEH
357 thread->run();
358 }
359 else {
360 // Install a win32 structured exception handler around every thread created
361 // by VM, so VM can genrate error dump when an exception occurred in non-
362 // Java thread (e.g. VM thread).
363 __try {
364 thread->run();
365 } __except(topLevelExceptionFilter(
366 (_EXCEPTION_POINTERS*)_exception_info())) {
367 // Nothing to do.
368 }
369 }
371 // One less thread is executing
372 // When the VMThread gets here, the main thread may have already exited
373 // which frees the CodeHeap containing the Atomic::add code
374 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
375 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
376 }
378 return 0;
379 }
381 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
382 // Allocate the OSThread object
383 OSThread* osthread = new OSThread(NULL, NULL);
384 if (osthread == NULL) return NULL;
386 // Initialize support for Java interrupts
387 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
388 if (interrupt_event == NULL) {
389 delete osthread;
390 return NULL;
391 }
392 osthread->set_interrupt_event(interrupt_event);
394 // Store info on the Win32 thread into the OSThread
395 osthread->set_thread_handle(thread_handle);
396 osthread->set_thread_id(thread_id);
398 if (UseNUMA) {
399 int lgrp_id = os::numa_get_group_id();
400 if (lgrp_id != -1) {
401 thread->set_lgrp_id(lgrp_id);
402 }
403 }
405 // Initial thread state is INITIALIZED, not SUSPENDED
406 osthread->set_state(INITIALIZED);
408 return osthread;
409 }
412 bool os::create_attached_thread(JavaThread* thread) {
413 #ifdef ASSERT
414 thread->verify_not_published();
415 #endif
416 HANDLE thread_h;
417 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
418 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
419 fatal("DuplicateHandle failed\n");
420 }
421 OSThread* osthread = create_os_thread(thread, thread_h,
422 (int)current_thread_id());
423 if (osthread == NULL) {
424 return false;
425 }
427 // Initial thread state is RUNNABLE
428 osthread->set_state(RUNNABLE);
430 thread->set_osthread(osthread);
431 return true;
432 }
434 bool os::create_main_thread(JavaThread* thread) {
435 #ifdef ASSERT
436 thread->verify_not_published();
437 #endif
438 if (_starting_thread == NULL) {
439 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
440 if (_starting_thread == NULL) {
441 return false;
442 }
443 }
445 // The primordial thread is runnable from the start)
446 _starting_thread->set_state(RUNNABLE);
448 thread->set_osthread(_starting_thread);
449 return true;
450 }
452 // Allocate and initialize a new OSThread
453 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
454 unsigned thread_id;
456 // Allocate the OSThread object
457 OSThread* osthread = new OSThread(NULL, NULL);
458 if (osthread == NULL) {
459 return false;
460 }
462 // Initialize support for Java interrupts
463 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
464 if (interrupt_event == NULL) {
465 delete osthread;
466 return NULL;
467 }
468 osthread->set_interrupt_event(interrupt_event);
469 osthread->set_interrupted(false);
471 thread->set_osthread(osthread);
473 if (stack_size == 0) {
474 switch (thr_type) {
475 case os::java_thread:
476 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
477 if (JavaThread::stack_size_at_create() > 0)
478 stack_size = JavaThread::stack_size_at_create();
479 break;
480 case os::compiler_thread:
481 if (CompilerThreadStackSize > 0) {
482 stack_size = (size_t)(CompilerThreadStackSize * K);
483 break;
484 } // else fall through:
485 // use VMThreadStackSize if CompilerThreadStackSize is not defined
486 case os::vm_thread:
487 case os::pgc_thread:
488 case os::cgc_thread:
489 case os::watcher_thread:
490 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
491 break;
492 }
493 }
495 // Create the Win32 thread
496 //
497 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
498 // does not specify stack size. Instead, it specifies the size of
499 // initially committed space. The stack size is determined by
500 // PE header in the executable. If the committed "stack_size" is larger
501 // than default value in the PE header, the stack is rounded up to the
502 // nearest multiple of 1MB. For example if the launcher has default
503 // stack size of 320k, specifying any size less than 320k does not
504 // affect the actual stack size at all, it only affects the initial
505 // commitment. On the other hand, specifying 'stack_size' larger than
506 // default value may cause significant increase in memory usage, because
507 // not only the stack space will be rounded up to MB, but also the
508 // entire space is committed upfront.
509 //
510 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
511 // for CreateThread() that can treat 'stack_size' as stack size. However we
512 // are not supposed to call CreateThread() directly according to MSDN
513 // document because JVM uses C runtime library. The good news is that the
514 // flag appears to work with _beginthredex() as well.
516 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
517 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
518 #endif
520 HANDLE thread_handle =
521 (HANDLE)_beginthreadex(NULL,
522 (unsigned)stack_size,
523 (unsigned (__stdcall *)(void*)) java_start,
524 thread,
525 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
526 &thread_id);
527 if (thread_handle == NULL) {
528 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
529 // without the flag.
530 thread_handle =
531 (HANDLE)_beginthreadex(NULL,
532 (unsigned)stack_size,
533 (unsigned (__stdcall *)(void*)) java_start,
534 thread,
535 CREATE_SUSPENDED,
536 &thread_id);
537 }
538 if (thread_handle == NULL) {
539 // Need to clean up stuff we've allocated so far
540 CloseHandle(osthread->interrupt_event());
541 thread->set_osthread(NULL);
542 delete osthread;
543 return NULL;
544 }
546 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
548 // Store info on the Win32 thread into the OSThread
549 osthread->set_thread_handle(thread_handle);
550 osthread->set_thread_id(thread_id);
552 // Initial thread state is INITIALIZED, not SUSPENDED
553 osthread->set_state(INITIALIZED);
555 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
556 return true;
557 }
560 // Free Win32 resources related to the OSThread
561 void os::free_thread(OSThread* osthread) {
562 assert(osthread != NULL, "osthread not set");
563 CloseHandle(osthread->thread_handle());
564 CloseHandle(osthread->interrupt_event());
565 delete osthread;
566 }
569 static int has_performance_count = 0;
570 static jlong first_filetime;
571 static jlong initial_performance_count;
572 static jlong performance_frequency;
575 jlong as_long(LARGE_INTEGER x) {
576 jlong result = 0; // initialization to avoid warning
577 set_high(&result, x.HighPart);
578 set_low(&result, x.LowPart);
579 return result;
580 }
583 jlong os::elapsed_counter() {
584 LARGE_INTEGER count;
585 if (has_performance_count) {
586 QueryPerformanceCounter(&count);
587 return as_long(count) - initial_performance_count;
588 } else {
589 FILETIME wt;
590 GetSystemTimeAsFileTime(&wt);
591 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
592 }
593 }
596 jlong os::elapsed_frequency() {
597 if (has_performance_count) {
598 return performance_frequency;
599 } else {
600 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
601 return 10000000;
602 }
603 }
606 julong os::available_memory() {
607 return win32::available_memory();
608 }
610 julong os::win32::available_memory() {
611 // FIXME: GlobalMemoryStatus() may return incorrect value if total memory
612 // is larger than 4GB
613 MEMORYSTATUS ms;
614 GlobalMemoryStatus(&ms);
616 return (julong)ms.dwAvailPhys;
617 }
619 julong os::physical_memory() {
620 return win32::physical_memory();
621 }
623 julong os::allocatable_physical_memory(julong size) {
624 #ifdef _LP64
625 return size;
626 #else
627 // Limit to 1400m because of the 2gb address space wall
628 return MIN2(size, (julong)1400*M);
629 #endif
630 }
632 // VC6 lacks DWORD_PTR
633 #if _MSC_VER < 1300
634 typedef UINT_PTR DWORD_PTR;
635 #endif
637 int os::active_processor_count() {
638 DWORD_PTR lpProcessAffinityMask = 0;
639 DWORD_PTR lpSystemAffinityMask = 0;
640 int proc_count = processor_count();
641 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
642 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
643 // Nof active processors is number of bits in process affinity mask
644 int bitcount = 0;
645 while (lpProcessAffinityMask != 0) {
646 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
647 bitcount++;
648 }
649 return bitcount;
650 } else {
651 return proc_count;
652 }
653 }
655 bool os::distribute_processes(uint length, uint* distribution) {
656 // Not yet implemented.
657 return false;
658 }
660 bool os::bind_to_processor(uint processor_id) {
661 // Not yet implemented.
662 return false;
663 }
665 static void initialize_performance_counter() {
666 LARGE_INTEGER count;
667 if (QueryPerformanceFrequency(&count)) {
668 has_performance_count = 1;
669 performance_frequency = as_long(count);
670 QueryPerformanceCounter(&count);
671 initial_performance_count = as_long(count);
672 } else {
673 has_performance_count = 0;
674 FILETIME wt;
675 GetSystemTimeAsFileTime(&wt);
676 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
677 }
678 }
681 double os::elapsedTime() {
682 return (double) elapsed_counter() / (double) elapsed_frequency();
683 }
686 // Windows format:
687 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
688 // Java format:
689 // Java standards require the number of milliseconds since 1/1/1970
691 // Constant offset - calculated using offset()
692 static jlong _offset = 116444736000000000;
693 // Fake time counter for reproducible results when debugging
694 static jlong fake_time = 0;
696 #ifdef ASSERT
697 // Just to be safe, recalculate the offset in debug mode
698 static jlong _calculated_offset = 0;
699 static int _has_calculated_offset = 0;
701 jlong offset() {
702 if (_has_calculated_offset) return _calculated_offset;
703 SYSTEMTIME java_origin;
704 java_origin.wYear = 1970;
705 java_origin.wMonth = 1;
706 java_origin.wDayOfWeek = 0; // ignored
707 java_origin.wDay = 1;
708 java_origin.wHour = 0;
709 java_origin.wMinute = 0;
710 java_origin.wSecond = 0;
711 java_origin.wMilliseconds = 0;
712 FILETIME jot;
713 if (!SystemTimeToFileTime(&java_origin, &jot)) {
714 fatal1("Error = %d\nWindows error", GetLastError());
715 }
716 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
717 _has_calculated_offset = 1;
718 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
719 return _calculated_offset;
720 }
721 #else
722 jlong offset() {
723 return _offset;
724 }
725 #endif
727 jlong windows_to_java_time(FILETIME wt) {
728 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
729 return (a - offset()) / 10000;
730 }
732 FILETIME java_to_windows_time(jlong l) {
733 jlong a = (l * 10000) + offset();
734 FILETIME result;
735 result.dwHighDateTime = high(a);
736 result.dwLowDateTime = low(a);
737 return result;
738 }
740 jlong os::javaTimeMillis() {
741 if (UseFakeTimers) {
742 return fake_time++;
743 } else {
744 FILETIME wt;
745 GetSystemTimeAsFileTime(&wt);
746 return windows_to_java_time(wt);
747 }
748 }
750 #define NANOS_PER_SEC CONST64(1000000000)
751 #define NANOS_PER_MILLISEC 1000000
752 jlong os::javaTimeNanos() {
753 if (!has_performance_count) {
754 return javaTimeMillis() * NANOS_PER_MILLISEC; // the best we can do.
755 } else {
756 LARGE_INTEGER current_count;
757 QueryPerformanceCounter(¤t_count);
758 double current = as_long(current_count);
759 double freq = performance_frequency;
760 jlong time = (jlong)((current/freq) * NANOS_PER_SEC);
761 return time;
762 }
763 }
765 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
766 if (!has_performance_count) {
767 // javaTimeMillis() doesn't have much percision,
768 // but it is not going to wrap -- so all 64 bits
769 info_ptr->max_value = ALL_64_BITS;
771 // this is a wall clock timer, so may skip
772 info_ptr->may_skip_backward = true;
773 info_ptr->may_skip_forward = true;
774 } else {
775 jlong freq = performance_frequency;
776 if (freq < NANOS_PER_SEC) {
777 // the performance counter is 64 bits and we will
778 // be multiplying it -- so no wrap in 64 bits
779 info_ptr->max_value = ALL_64_BITS;
780 } else if (freq > NANOS_PER_SEC) {
781 // use the max value the counter can reach to
782 // determine the max value which could be returned
783 julong max_counter = (julong)ALL_64_BITS;
784 info_ptr->max_value = (jlong)(max_counter / (freq / NANOS_PER_SEC));
785 } else {
786 // the performance counter is 64 bits and we will
787 // be using it directly -- so no wrap in 64 bits
788 info_ptr->max_value = ALL_64_BITS;
789 }
791 // using a counter, so no skipping
792 info_ptr->may_skip_backward = false;
793 info_ptr->may_skip_forward = false;
794 }
795 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
796 }
798 char* os::local_time_string(char *buf, size_t buflen) {
799 SYSTEMTIME st;
800 GetLocalTime(&st);
801 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
802 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
803 return buf;
804 }
806 bool os::getTimesSecs(double* process_real_time,
807 double* process_user_time,
808 double* process_system_time) {
809 HANDLE h_process = GetCurrentProcess();
810 FILETIME create_time, exit_time, kernel_time, user_time;
811 BOOL result = GetProcessTimes(h_process,
812 &create_time,
813 &exit_time,
814 &kernel_time,
815 &user_time);
816 if (result != 0) {
817 FILETIME wt;
818 GetSystemTimeAsFileTime(&wt);
819 jlong rtc_millis = windows_to_java_time(wt);
820 jlong user_millis = windows_to_java_time(user_time);
821 jlong system_millis = windows_to_java_time(kernel_time);
822 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
823 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
824 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
825 return true;
826 } else {
827 return false;
828 }
829 }
831 void os::shutdown() {
833 // allow PerfMemory to attempt cleanup of any persistent resources
834 perfMemory_exit();
836 // flush buffered output, finish log files
837 ostream_abort();
839 // Check for abort hook
840 abort_hook_t abort_hook = Arguments::abort_hook();
841 if (abort_hook != NULL) {
842 abort_hook();
843 }
844 }
846 void os::abort(bool dump_core)
847 {
848 os::shutdown();
849 // no core dump on Windows
850 ::exit(1);
851 }
853 // Die immediately, no exit hook, no abort hook, no cleanup.
854 void os::die() {
855 _exit(-1);
856 }
858 // Directory routines copied from src/win32/native/java/io/dirent_md.c
859 // * dirent_md.c 1.15 00/02/02
860 //
861 // The declarations for DIR and struct dirent are in jvm_win32.h.
863 /* Caller must have already run dirname through JVM_NativePath, which removes
864 duplicate slashes and converts all instances of '/' into '\\'. */
866 DIR *
867 os::opendir(const char *dirname)
868 {
869 assert(dirname != NULL, "just checking"); // hotspot change
870 DIR *dirp = (DIR *)malloc(sizeof(DIR));
871 DWORD fattr; // hotspot change
872 char alt_dirname[4] = { 0, 0, 0, 0 };
874 if (dirp == 0) {
875 errno = ENOMEM;
876 return 0;
877 }
879 /*
880 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
881 * as a directory in FindFirstFile(). We detect this case here and
882 * prepend the current drive name.
883 */
884 if (dirname[1] == '\0' && dirname[0] == '\\') {
885 alt_dirname[0] = _getdrive() + 'A' - 1;
886 alt_dirname[1] = ':';
887 alt_dirname[2] = '\\';
888 alt_dirname[3] = '\0';
889 dirname = alt_dirname;
890 }
892 dirp->path = (char *)malloc(strlen(dirname) + 5);
893 if (dirp->path == 0) {
894 free(dirp);
895 errno = ENOMEM;
896 return 0;
897 }
898 strcpy(dirp->path, dirname);
900 fattr = GetFileAttributes(dirp->path);
901 if (fattr == 0xffffffff) {
902 free(dirp->path);
903 free(dirp);
904 errno = ENOENT;
905 return 0;
906 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
907 free(dirp->path);
908 free(dirp);
909 errno = ENOTDIR;
910 return 0;
911 }
913 /* Append "*.*", or possibly "\\*.*", to path */
914 if (dirp->path[1] == ':'
915 && (dirp->path[2] == '\0'
916 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
917 /* No '\\' needed for cases like "Z:" or "Z:\" */
918 strcat(dirp->path, "*.*");
919 } else {
920 strcat(dirp->path, "\\*.*");
921 }
923 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
924 if (dirp->handle == INVALID_HANDLE_VALUE) {
925 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
926 free(dirp->path);
927 free(dirp);
928 errno = EACCES;
929 return 0;
930 }
931 }
932 return dirp;
933 }
935 /* parameter dbuf unused on Windows */
937 struct dirent *
938 os::readdir(DIR *dirp, dirent *dbuf)
939 {
940 assert(dirp != NULL, "just checking"); // hotspot change
941 if (dirp->handle == INVALID_HANDLE_VALUE) {
942 return 0;
943 }
945 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
947 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
948 if (GetLastError() == ERROR_INVALID_HANDLE) {
949 errno = EBADF;
950 return 0;
951 }
952 FindClose(dirp->handle);
953 dirp->handle = INVALID_HANDLE_VALUE;
954 }
956 return &dirp->dirent;
957 }
959 int
960 os::closedir(DIR *dirp)
961 {
962 assert(dirp != NULL, "just checking"); // hotspot change
963 if (dirp->handle != INVALID_HANDLE_VALUE) {
964 if (!FindClose(dirp->handle)) {
965 errno = EBADF;
966 return -1;
967 }
968 dirp->handle = INVALID_HANDLE_VALUE;
969 }
970 free(dirp->path);
971 free(dirp);
972 return 0;
973 }
975 const char* os::dll_file_extension() { return ".dll"; }
977 const char * os::get_temp_directory()
978 {
979 static char path_buf[MAX_PATH];
980 if (GetTempPath(MAX_PATH, path_buf)>0)
981 return path_buf;
982 else{
983 path_buf[0]='\0';
984 return path_buf;
985 }
986 }
988 // Needs to be in os specific directory because windows requires another
989 // header file <direct.h>
990 const char* os::get_current_directory(char *buf, int buflen) {
991 return _getcwd(buf, buflen);
992 }
994 //-----------------------------------------------------------
995 // Helper functions for fatal error handler
997 // The following library functions are resolved dynamically at runtime:
999 // PSAPI functions, for Windows NT, 2000, XP
1001 // psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform
1002 // SDK from Microsoft. Here are the definitions copied from psapi.h
1003 typedef struct _MODULEINFO {
1004 LPVOID lpBaseOfDll;
1005 DWORD SizeOfImage;
1006 LPVOID EntryPoint;
1007 } MODULEINFO, *LPMODULEINFO;
1009 static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD );
1010 static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD );
1011 static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD );
1013 // ToolHelp Functions, for Windows 95, 98 and ME
1015 static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ;
1016 static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ;
1017 static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ;
1019 bool _has_psapi;
1020 bool _psapi_init = false;
1021 bool _has_toolhelp;
1023 static bool _init_psapi() {
1024 HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ;
1025 if( psapi == NULL ) return false ;
1027 _EnumProcessModules = CAST_TO_FN_PTR(
1028 BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD),
1029 GetProcAddress(psapi, "EnumProcessModules")) ;
1030 _GetModuleFileNameEx = CAST_TO_FN_PTR(
1031 DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD),
1032 GetProcAddress(psapi, "GetModuleFileNameExA"));
1033 _GetModuleInformation = CAST_TO_FN_PTR(
1034 BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD),
1035 GetProcAddress(psapi, "GetModuleInformation"));
1037 _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation);
1038 _psapi_init = true;
1039 return _has_psapi;
1040 }
1042 static bool _init_toolhelp() {
1043 HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ;
1044 if (kernel32 == NULL) return false ;
1046 _CreateToolhelp32Snapshot = CAST_TO_FN_PTR(
1047 HANDLE(WINAPI *)(DWORD,DWORD),
1048 GetProcAddress(kernel32, "CreateToolhelp32Snapshot"));
1049 _Module32First = CAST_TO_FN_PTR(
1050 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1051 GetProcAddress(kernel32, "Module32First" ));
1052 _Module32Next = CAST_TO_FN_PTR(
1053 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1054 GetProcAddress(kernel32, "Module32Next" ));
1056 _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next);
1057 return _has_toolhelp;
1058 }
1060 #ifdef _WIN64
1061 // Helper routine which returns true if address in
1062 // within the NTDLL address space.
1063 //
1064 static bool _addr_in_ntdll( address addr )
1065 {
1066 HMODULE hmod;
1067 MODULEINFO minfo;
1069 hmod = GetModuleHandle("NTDLL.DLL");
1070 if ( hmod == NULL ) return false;
1071 if ( !_GetModuleInformation( GetCurrentProcess(), hmod,
1072 &minfo, sizeof(MODULEINFO)) )
1073 return false;
1075 if ( (addr >= minfo.lpBaseOfDll) &&
1076 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1077 return true;
1078 else
1079 return false;
1080 }
1081 #endif
1084 // Enumerate all modules for a given process ID
1085 //
1086 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1087 // different API for doing this. We use PSAPI.DLL on NT based
1088 // Windows and ToolHelp on 95/98/Me.
1090 // Callback function that is called by enumerate_modules() on
1091 // every DLL module.
1092 // Input parameters:
1093 // int pid,
1094 // char* module_file_name,
1095 // address module_base_addr,
1096 // unsigned module_size,
1097 // void* param
1098 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1100 // enumerate_modules for Windows NT, using PSAPI
1101 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1102 {
1103 HANDLE hProcess ;
1105 # define MAX_NUM_MODULES 128
1106 HMODULE modules[MAX_NUM_MODULES];
1107 static char filename[ MAX_PATH ];
1108 int result = 0;
1110 if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0;
1112 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1113 FALSE, pid ) ;
1114 if (hProcess == NULL) return 0;
1116 DWORD size_needed;
1117 if (!_EnumProcessModules(hProcess, modules,
1118 sizeof(modules), &size_needed)) {
1119 CloseHandle( hProcess );
1120 return 0;
1121 }
1123 // number of modules that are currently loaded
1124 int num_modules = size_needed / sizeof(HMODULE);
1126 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1127 // Get Full pathname:
1128 if(!_GetModuleFileNameEx(hProcess, modules[i],
1129 filename, sizeof(filename))) {
1130 filename[0] = '\0';
1131 }
1133 MODULEINFO modinfo;
1134 if (!_GetModuleInformation(hProcess, modules[i],
1135 &modinfo, sizeof(modinfo))) {
1136 modinfo.lpBaseOfDll = NULL;
1137 modinfo.SizeOfImage = 0;
1138 }
1140 // Invoke callback function
1141 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1142 modinfo.SizeOfImage, param);
1143 if (result) break;
1144 }
1146 CloseHandle( hProcess ) ;
1147 return result;
1148 }
1151 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1152 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1153 {
1154 HANDLE hSnapShot ;
1155 static MODULEENTRY32 modentry ;
1156 int result = 0;
1158 if (!_has_toolhelp) return 0;
1160 // Get a handle to a Toolhelp snapshot of the system
1161 hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1162 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1163 return FALSE ;
1164 }
1166 // iterate through all modules
1167 modentry.dwSize = sizeof(MODULEENTRY32) ;
1168 bool not_done = _Module32First( hSnapShot, &modentry ) != 0;
1170 while( not_done ) {
1171 // invoke the callback
1172 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1173 modentry.modBaseSize, param);
1174 if (result) break;
1176 modentry.dwSize = sizeof(MODULEENTRY32) ;
1177 not_done = _Module32Next( hSnapShot, &modentry ) != 0;
1178 }
1180 CloseHandle(hSnapShot);
1181 return result;
1182 }
1184 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1185 {
1186 // Get current process ID if caller doesn't provide it.
1187 if (!pid) pid = os::current_process_id();
1189 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1190 else return _enumerate_modules_windows(pid, func, param);
1191 }
1193 struct _modinfo {
1194 address addr;
1195 char* full_path; // point to a char buffer
1196 int buflen; // size of the buffer
1197 address base_addr;
1198 };
1200 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1201 unsigned size, void * param) {
1202 struct _modinfo *pmod = (struct _modinfo *)param;
1203 if (!pmod) return -1;
1205 if (base_addr <= pmod->addr &&
1206 base_addr+size > pmod->addr) {
1207 // if a buffer is provided, copy path name to the buffer
1208 if (pmod->full_path) {
1209 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1210 }
1211 pmod->base_addr = base_addr;
1212 return 1;
1213 }
1214 return 0;
1215 }
1217 bool os::dll_address_to_library_name(address addr, char* buf,
1218 int buflen, int* offset) {
1219 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1220 // return the full path to the DLL file, sometimes it returns path
1221 // to the corresponding PDB file (debug info); sometimes it only
1222 // returns partial path, which makes life painful.
1224 struct _modinfo mi;
1225 mi.addr = addr;
1226 mi.full_path = buf;
1227 mi.buflen = buflen;
1228 int pid = os::current_process_id();
1229 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1230 // buf already contains path name
1231 if (offset) *offset = addr - mi.base_addr;
1232 return true;
1233 } else {
1234 if (buf) buf[0] = '\0';
1235 if (offset) *offset = -1;
1236 return false;
1237 }
1238 }
1240 bool os::dll_address_to_function_name(address addr, char *buf,
1241 int buflen, int *offset) {
1242 // Unimplemented on Windows - in order to use SymGetSymFromAddr(),
1243 // we need to initialize imagehlp/dbghelp, then load symbol table
1244 // for every module. That's too much work to do after a fatal error.
1245 // For an example on how to implement this function, see 1.4.2.
1246 if (offset) *offset = -1;
1247 if (buf) buf[0] = '\0';
1248 return false;
1249 }
1251 // save the start and end address of jvm.dll into param[0] and param[1]
1252 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1253 unsigned size, void * param) {
1254 if (!param) return -1;
1256 if (base_addr <= (address)_locate_jvm_dll &&
1257 base_addr+size > (address)_locate_jvm_dll) {
1258 ((address*)param)[0] = base_addr;
1259 ((address*)param)[1] = base_addr + size;
1260 return 1;
1261 }
1262 return 0;
1263 }
1265 address vm_lib_location[2]; // start and end address of jvm.dll
1267 // check if addr is inside jvm.dll
1268 bool os::address_is_in_vm(address addr) {
1269 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1270 int pid = os::current_process_id();
1271 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1272 assert(false, "Can't find jvm module.");
1273 return false;
1274 }
1275 }
1277 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1278 }
1280 // print module info; param is outputStream*
1281 static int _print_module(int pid, char* fname, address base,
1282 unsigned size, void* param) {
1283 if (!param) return -1;
1285 outputStream* st = (outputStream*)param;
1287 address end_addr = base + size;
1288 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1289 return 0;
1290 }
1292 // Loads .dll/.so and
1293 // in case of error it checks if .dll/.so was built for the
1294 // same architecture as Hotspot is running on
1295 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1296 {
1297 void * result = LoadLibrary(name);
1298 if (result != NULL)
1299 {
1300 return result;
1301 }
1303 long errcode = GetLastError();
1304 if (errcode == ERROR_MOD_NOT_FOUND) {
1305 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1306 ebuf[ebuflen-1]='\0';
1307 return NULL;
1308 }
1310 // Parsing dll below
1311 // If we can read dll-info and find that dll was built
1312 // for an architecture other than Hotspot is running in
1313 // - then print to buffer "DLL was built for a different architecture"
1314 // else call getLastErrorString to obtain system error message
1316 // Read system error message into ebuf
1317 // It may or may not be overwritten below (in the for loop and just above)
1318 getLastErrorString(ebuf, (size_t) ebuflen);
1319 ebuf[ebuflen-1]='\0';
1320 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1321 if (file_descriptor<0)
1322 {
1323 return NULL;
1324 }
1326 uint32_t signature_offset;
1327 uint16_t lib_arch=0;
1328 bool failed_to_get_lib_arch=
1329 (
1330 //Go to position 3c in the dll
1331 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1332 ||
1333 // Read loacation of signature
1334 (sizeof(signature_offset)!=
1335 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1336 ||
1337 //Go to COFF File Header in dll
1338 //that is located after"signature" (4 bytes long)
1339 (os::seek_to_file_offset(file_descriptor,
1340 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1341 ||
1342 //Read field that contains code of architecture
1343 // that dll was build for
1344 (sizeof(lib_arch)!=
1345 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1346 );
1348 ::close(file_descriptor);
1349 if (failed_to_get_lib_arch)
1350 {
1351 // file i/o error - report getLastErrorString(...) msg
1352 return NULL;
1353 }
1355 typedef struct
1356 {
1357 uint16_t arch_code;
1358 char* arch_name;
1359 } arch_t;
1361 static const arch_t arch_array[]={
1362 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1363 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1364 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1365 };
1366 #if (defined _M_IA64)
1367 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1368 #elif (defined _M_AMD64)
1369 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1370 #elif (defined _M_IX86)
1371 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1372 #else
1373 #error Method os::dll_load requires that one of following \
1374 is defined :_M_IA64,_M_AMD64 or _M_IX86
1375 #endif
1378 // Obtain a string for printf operation
1379 // lib_arch_str shall contain string what platform this .dll was built for
1380 // running_arch_str shall string contain what platform Hotspot was built for
1381 char *running_arch_str=NULL,*lib_arch_str=NULL;
1382 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1383 {
1384 if (lib_arch==arch_array[i].arch_code)
1385 lib_arch_str=arch_array[i].arch_name;
1386 if (running_arch==arch_array[i].arch_code)
1387 running_arch_str=arch_array[i].arch_name;
1388 }
1390 assert(running_arch_str,
1391 "Didn't find runing architecture code in arch_array");
1393 // If the architure is right
1394 // but some other error took place - report getLastErrorString(...) msg
1395 if (lib_arch == running_arch)
1396 {
1397 return NULL;
1398 }
1400 if (lib_arch_str!=NULL)
1401 {
1402 ::_snprintf(ebuf, ebuflen-1,
1403 "Can't load %s-bit .dll on a %s-bit platform",
1404 lib_arch_str,running_arch_str);
1405 }
1406 else
1407 {
1408 // don't know what architecture this dll was build for
1409 ::_snprintf(ebuf, ebuflen-1,
1410 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1411 lib_arch,running_arch_str);
1412 }
1414 return NULL;
1415 }
1418 void os::print_dll_info(outputStream *st) {
1419 int pid = os::current_process_id();
1420 st->print_cr("Dynamic libraries:");
1421 enumerate_modules(pid, _print_module, (void *)st);
1422 }
1424 void os::print_os_info(outputStream* st) {
1425 st->print("OS:");
1427 OSVERSIONINFOEX osvi;
1428 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1429 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1431 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1432 st->print_cr("N/A");
1433 return;
1434 }
1436 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1438 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1439 switch (os_vers) {
1440 case 3051: st->print(" Windows NT 3.51"); break;
1441 case 4000: st->print(" Windows NT 4.0"); break;
1442 case 5000: st->print(" Windows 2000"); break;
1443 case 5001: st->print(" Windows XP"); break;
1444 case 5002: st->print(" Windows Server 2003 family"); break;
1445 case 6000: st->print(" Windows Vista"); break;
1446 default: // future windows, print out its major and minor versions
1447 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1448 }
1449 } else {
1450 switch (os_vers) {
1451 case 4000: st->print(" Windows 95"); break;
1452 case 4010: st->print(" Windows 98"); break;
1453 case 4090: st->print(" Windows Me"); break;
1454 default: // future windows, print out its major and minor versions
1455 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1456 }
1457 }
1459 st->print(" Build %d", osvi.dwBuildNumber);
1460 st->print(" %s", osvi.szCSDVersion); // service pack
1461 st->cr();
1462 }
1464 void os::print_memory_info(outputStream* st) {
1465 st->print("Memory:");
1466 st->print(" %dk page", os::vm_page_size()>>10);
1468 // FIXME: GlobalMemoryStatus() may return incorrect value if total memory
1469 // is larger than 4GB
1470 MEMORYSTATUS ms;
1471 GlobalMemoryStatus(&ms);
1473 st->print(", physical %uk", os::physical_memory() >> 10);
1474 st->print("(%uk free)", os::available_memory() >> 10);
1476 st->print(", swap %uk", ms.dwTotalPageFile >> 10);
1477 st->print("(%uk free)", ms.dwAvailPageFile >> 10);
1478 st->cr();
1479 }
1481 void os::print_siginfo(outputStream *st, void *siginfo) {
1482 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1483 st->print("siginfo:");
1484 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1486 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1487 er->NumberParameters >= 2) {
1488 switch (er->ExceptionInformation[0]) {
1489 case 0: st->print(", reading address"); break;
1490 case 1: st->print(", writing address"); break;
1491 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1492 er->ExceptionInformation[0]);
1493 }
1494 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1495 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1496 er->NumberParameters >= 2 && UseSharedSpaces) {
1497 FileMapInfo* mapinfo = FileMapInfo::current_info();
1498 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1499 st->print("\n\nError accessing class data sharing archive." \
1500 " Mapped file inaccessible during execution, " \
1501 " possible disk/network problem.");
1502 }
1503 } else {
1504 int num = er->NumberParameters;
1505 if (num > 0) {
1506 st->print(", ExceptionInformation=");
1507 for (int i = 0; i < num; i++) {
1508 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1509 }
1510 }
1511 }
1512 st->cr();
1513 }
1515 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1516 // do nothing
1517 }
1519 static char saved_jvm_path[MAX_PATH] = {0};
1521 // Find the full path to the current module, jvm.dll or jvm_g.dll
1522 void os::jvm_path(char *buf, jint buflen) {
1523 // Error checking.
1524 if (buflen < MAX_PATH) {
1525 assert(false, "must use a large-enough buffer");
1526 buf[0] = '\0';
1527 return;
1528 }
1529 // Lazy resolve the path to current module.
1530 if (saved_jvm_path[0] != 0) {
1531 strcpy(buf, saved_jvm_path);
1532 return;
1533 }
1535 GetModuleFileName(vm_lib_handle, buf, buflen);
1536 strcpy(saved_jvm_path, buf);
1537 }
1540 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1541 #ifndef _WIN64
1542 st->print("_");
1543 #endif
1544 }
1547 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1548 #ifndef _WIN64
1549 st->print("@%d", args_size * sizeof(int));
1550 #endif
1551 }
1553 // sun.misc.Signal
1554 // NOTE that this is a workaround for an apparent kernel bug where if
1555 // a signal handler for SIGBREAK is installed then that signal handler
1556 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1557 // See bug 4416763.
1558 static void (*sigbreakHandler)(int) = NULL;
1560 static void UserHandler(int sig, void *siginfo, void *context) {
1561 os::signal_notify(sig);
1562 // We need to reinstate the signal handler each time...
1563 os::signal(sig, (void*)UserHandler);
1564 }
1566 void* os::user_handler() {
1567 return (void*) UserHandler;
1568 }
1570 void* os::signal(int signal_number, void* handler) {
1571 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1572 void (*oldHandler)(int) = sigbreakHandler;
1573 sigbreakHandler = (void (*)(int)) handler;
1574 return (void*) oldHandler;
1575 } else {
1576 return (void*)::signal(signal_number, (void (*)(int))handler);
1577 }
1578 }
1580 void os::signal_raise(int signal_number) {
1581 raise(signal_number);
1582 }
1584 // The Win32 C runtime library maps all console control events other than ^C
1585 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1586 // logoff, and shutdown events. We therefore install our own console handler
1587 // that raises SIGTERM for the latter cases.
1588 //
1589 static BOOL WINAPI consoleHandler(DWORD event) {
1590 switch(event) {
1591 case CTRL_C_EVENT:
1592 if (is_error_reported()) {
1593 // Ctrl-C is pressed during error reporting, likely because the error
1594 // handler fails to abort. Let VM die immediately.
1595 os::die();
1596 }
1598 os::signal_raise(SIGINT);
1599 return TRUE;
1600 break;
1601 case CTRL_BREAK_EVENT:
1602 if (sigbreakHandler != NULL) {
1603 (*sigbreakHandler)(SIGBREAK);
1604 }
1605 return TRUE;
1606 break;
1607 case CTRL_CLOSE_EVENT:
1608 case CTRL_LOGOFF_EVENT:
1609 case CTRL_SHUTDOWN_EVENT:
1610 os::signal_raise(SIGTERM);
1611 return TRUE;
1612 break;
1613 default:
1614 break;
1615 }
1616 return FALSE;
1617 }
1619 /*
1620 * The following code is moved from os.cpp for making this
1621 * code platform specific, which it is by its very nature.
1622 */
1624 // Return maximum OS signal used + 1 for internal use only
1625 // Used as exit signal for signal_thread
1626 int os::sigexitnum_pd(){
1627 return NSIG;
1628 }
1630 // a counter for each possible signal value, including signal_thread exit signal
1631 static volatile jint pending_signals[NSIG+1] = { 0 };
1632 static HANDLE sig_sem;
1634 void os::signal_init_pd() {
1635 // Initialize signal structures
1636 memset((void*)pending_signals, 0, sizeof(pending_signals));
1638 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
1640 // Programs embedding the VM do not want it to attempt to receive
1641 // events like CTRL_LOGOFF_EVENT, which are used to implement the
1642 // shutdown hooks mechanism introduced in 1.3. For example, when
1643 // the VM is run as part of a Windows NT service (i.e., a servlet
1644 // engine in a web server), the correct behavior is for any console
1645 // control handler to return FALSE, not TRUE, because the OS's
1646 // "final" handler for such events allows the process to continue if
1647 // it is a service (while terminating it if it is not a service).
1648 // To make this behavior uniform and the mechanism simpler, we
1649 // completely disable the VM's usage of these console events if -Xrs
1650 // (=ReduceSignalUsage) is specified. This means, for example, that
1651 // the CTRL-BREAK thread dump mechanism is also disabled in this
1652 // case. See bugs 4323062, 4345157, and related bugs.
1654 if (!ReduceSignalUsage) {
1655 // Add a CTRL-C handler
1656 SetConsoleCtrlHandler(consoleHandler, TRUE);
1657 }
1658 }
1660 void os::signal_notify(int signal_number) {
1661 BOOL ret;
1663 Atomic::inc(&pending_signals[signal_number]);
1664 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1665 assert(ret != 0, "ReleaseSemaphore() failed");
1666 }
1668 static int check_pending_signals(bool wait_for_signal) {
1669 DWORD ret;
1670 while (true) {
1671 for (int i = 0; i < NSIG + 1; i++) {
1672 jint n = pending_signals[i];
1673 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1674 return i;
1675 }
1676 }
1677 if (!wait_for_signal) {
1678 return -1;
1679 }
1681 JavaThread *thread = JavaThread::current();
1683 ThreadBlockInVM tbivm(thread);
1685 bool threadIsSuspended;
1686 do {
1687 thread->set_suspend_equivalent();
1688 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1689 ret = ::WaitForSingleObject(sig_sem, INFINITE);
1690 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
1692 // were we externally suspended while we were waiting?
1693 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1694 if (threadIsSuspended) {
1695 //
1696 // The semaphore has been incremented, but while we were waiting
1697 // another thread suspended us. We don't want to continue running
1698 // while suspended because that would surprise the thread that
1699 // suspended us.
1700 //
1701 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1702 assert(ret != 0, "ReleaseSemaphore() failed");
1704 thread->java_suspend_self();
1705 }
1706 } while (threadIsSuspended);
1707 }
1708 }
1710 int os::signal_lookup() {
1711 return check_pending_signals(false);
1712 }
1714 int os::signal_wait() {
1715 return check_pending_signals(true);
1716 }
1718 // Implicit OS exception handling
1720 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
1721 JavaThread* thread = JavaThread::current();
1722 // Save pc in thread
1723 #ifdef _M_IA64
1724 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP);
1725 // Set pc to handler
1726 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
1727 #elif _M_AMD64
1728 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip);
1729 // Set pc to handler
1730 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
1731 #else
1732 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip);
1733 // Set pc to handler
1734 exceptionInfo->ContextRecord->Eip = (LONG)handler;
1735 #endif
1737 // Continue the execution
1738 return EXCEPTION_CONTINUE_EXECUTION;
1739 }
1742 // Used for PostMortemDump
1743 extern "C" void safepoints();
1744 extern "C" void find(int x);
1745 extern "C" void events();
1747 // According to Windows API documentation, an illegal instruction sequence should generate
1748 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
1749 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
1750 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
1752 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
1754 // From "Execution Protection in the Windows Operating System" draft 0.35
1755 // Once a system header becomes available, the "real" define should be
1756 // included or copied here.
1757 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
1759 #define def_excpt(val) #val, val
1761 struct siglabel {
1762 char *name;
1763 int number;
1764 };
1766 struct siglabel exceptlabels[] = {
1767 def_excpt(EXCEPTION_ACCESS_VIOLATION),
1768 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
1769 def_excpt(EXCEPTION_BREAKPOINT),
1770 def_excpt(EXCEPTION_SINGLE_STEP),
1771 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
1772 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
1773 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
1774 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
1775 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
1776 def_excpt(EXCEPTION_FLT_OVERFLOW),
1777 def_excpt(EXCEPTION_FLT_STACK_CHECK),
1778 def_excpt(EXCEPTION_FLT_UNDERFLOW),
1779 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
1780 def_excpt(EXCEPTION_INT_OVERFLOW),
1781 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
1782 def_excpt(EXCEPTION_IN_PAGE_ERROR),
1783 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
1784 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
1785 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
1786 def_excpt(EXCEPTION_STACK_OVERFLOW),
1787 def_excpt(EXCEPTION_INVALID_DISPOSITION),
1788 def_excpt(EXCEPTION_GUARD_PAGE),
1789 def_excpt(EXCEPTION_INVALID_HANDLE),
1790 NULL, 0
1791 };
1793 const char* os::exception_name(int exception_code, char *buf, size_t size) {
1794 for (int i = 0; exceptlabels[i].name != NULL; i++) {
1795 if (exceptlabels[i].number == exception_code) {
1796 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
1797 return buf;
1798 }
1799 }
1801 return NULL;
1802 }
1804 //-----------------------------------------------------------------------------
1805 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
1806 // handle exception caused by idiv; should only happen for -MinInt/-1
1807 // (division by zero is handled explicitly)
1808 #ifdef _M_IA64
1809 assert(0, "Fix Handle_IDiv_Exception");
1810 #elif _M_AMD64
1811 PCONTEXT ctx = exceptionInfo->ContextRecord;
1812 address pc = (address)ctx->Rip;
1813 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
1814 assert(pc[0] == 0xF7, "not an idiv opcode");
1815 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
1816 assert(ctx->Rax == min_jint, "unexpected idiv exception");
1817 // set correct result values and continue after idiv instruction
1818 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
1819 ctx->Rax = (DWORD)min_jint; // result
1820 ctx->Rdx = (DWORD)0; // remainder
1821 // Continue the execution
1822 #else
1823 PCONTEXT ctx = exceptionInfo->ContextRecord;
1824 address pc = (address)ctx->Eip;
1825 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
1826 assert(pc[0] == 0xF7, "not an idiv opcode");
1827 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
1828 assert(ctx->Eax == min_jint, "unexpected idiv exception");
1829 // set correct result values and continue after idiv instruction
1830 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
1831 ctx->Eax = (DWORD)min_jint; // result
1832 ctx->Edx = (DWORD)0; // remainder
1833 // Continue the execution
1834 #endif
1835 return EXCEPTION_CONTINUE_EXECUTION;
1836 }
1838 #ifndef _WIN64
1839 //-----------------------------------------------------------------------------
1840 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
1841 // handle exception caused by native mothod modifying control word
1842 PCONTEXT ctx = exceptionInfo->ContextRecord;
1843 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
1845 switch (exception_code) {
1846 case EXCEPTION_FLT_DENORMAL_OPERAND:
1847 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
1848 case EXCEPTION_FLT_INEXACT_RESULT:
1849 case EXCEPTION_FLT_INVALID_OPERATION:
1850 case EXCEPTION_FLT_OVERFLOW:
1851 case EXCEPTION_FLT_STACK_CHECK:
1852 case EXCEPTION_FLT_UNDERFLOW:
1853 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
1854 if (fp_control_word != ctx->FloatSave.ControlWord) {
1855 // Restore FPCW and mask out FLT exceptions
1856 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
1857 // Mask out pending FLT exceptions
1858 ctx->FloatSave.StatusWord &= 0xffffff00;
1859 return EXCEPTION_CONTINUE_EXECUTION;
1860 }
1861 }
1862 return EXCEPTION_CONTINUE_SEARCH;
1863 }
1864 #else //_WIN64
1865 /*
1866 On Windows, the mxcsr control bits are non-volatile across calls
1867 See also CR 6192333
1868 If EXCEPTION_FLT_* happened after some native method modified
1869 mxcsr - it is not a jvm fault.
1870 However should we decide to restore of mxcsr after a faulty
1871 native method we can uncomment following code
1872 jint MxCsr = INITIAL_MXCSR;
1873 // we can't use StubRoutines::addr_mxcsr_std()
1874 // because in Win64 mxcsr is not saved there
1875 if (MxCsr != ctx->MxCsr) {
1876 ctx->MxCsr = MxCsr;
1877 return EXCEPTION_CONTINUE_EXECUTION;
1878 }
1880 */
1881 #endif //_WIN64
1884 // Fatal error reporting is single threaded so we can make this a
1885 // static and preallocated. If it's more than MAX_PATH silently ignore
1886 // it.
1887 static char saved_error_file[MAX_PATH] = {0};
1889 void os::set_error_file(const char *logfile) {
1890 if (strlen(logfile) <= MAX_PATH) {
1891 strncpy(saved_error_file, logfile, MAX_PATH);
1892 }
1893 }
1895 static inline void report_error(Thread* t, DWORD exception_code,
1896 address addr, void* siginfo, void* context) {
1897 VMError err(t, exception_code, addr, siginfo, context);
1898 err.report_and_die();
1900 // If UseOsErrorReporting, this will return here and save the error file
1901 // somewhere where we can find it in the minidump.
1902 }
1904 //-----------------------------------------------------------------------------
1905 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
1906 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
1907 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
1908 #ifdef _M_IA64
1909 address pc = (address) exceptionInfo->ContextRecord->StIIP;
1910 #elif _M_AMD64
1911 address pc = (address) exceptionInfo->ContextRecord->Rip;
1912 #else
1913 address pc = (address) exceptionInfo->ContextRecord->Eip;
1914 #endif
1915 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
1917 #ifndef _WIN64
1918 // Execution protection violation - win32 running on AMD64 only
1919 // Handled first to avoid misdiagnosis as a "normal" access violation;
1920 // This is safe to do because we have a new/unique ExceptionInformation
1921 // code for this condition.
1922 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
1923 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
1924 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
1925 address addr = (address) exceptionRecord->ExceptionInformation[1];
1927 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
1928 int page_size = os::vm_page_size();
1930 // Make sure the pc and the faulting address are sane.
1931 //
1932 // If an instruction spans a page boundary, and the page containing
1933 // the beginning of the instruction is executable but the following
1934 // page is not, the pc and the faulting address might be slightly
1935 // different - we still want to unguard the 2nd page in this case.
1936 //
1937 // 15 bytes seems to be a (very) safe value for max instruction size.
1938 bool pc_is_near_addr =
1939 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
1940 bool instr_spans_page_boundary =
1941 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
1942 (intptr_t) page_size) > 0);
1944 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
1945 static volatile address last_addr =
1946 (address) os::non_memory_address_word();
1948 // In conservative mode, don't unguard unless the address is in the VM
1949 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
1950 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
1952 // Unguard and retry
1953 address page_start =
1954 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
1955 bool res = os::unguard_memory((char*) page_start, page_size);
1957 if (PrintMiscellaneous && Verbose) {
1958 char buf[256];
1959 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
1960 "at " INTPTR_FORMAT
1961 ", unguarding " INTPTR_FORMAT ": %s", addr,
1962 page_start, (res ? "success" : strerror(errno)));
1963 tty->print_raw_cr(buf);
1964 }
1966 // Set last_addr so if we fault again at the same address, we don't
1967 // end up in an endless loop.
1968 //
1969 // There are two potential complications here. Two threads trapping
1970 // at the same address at the same time could cause one of the
1971 // threads to think it already unguarded, and abort the VM. Likely
1972 // very rare.
1973 //
1974 // The other race involves two threads alternately trapping at
1975 // different addresses and failing to unguard the page, resulting in
1976 // an endless loop. This condition is probably even more unlikely
1977 // than the first.
1978 //
1979 // Although both cases could be avoided by using locks or thread
1980 // local last_addr, these solutions are unnecessary complication:
1981 // this handler is a best-effort safety net, not a complete solution.
1982 // It is disabled by default and should only be used as a workaround
1983 // in case we missed any no-execute-unsafe VM code.
1985 last_addr = addr;
1987 return EXCEPTION_CONTINUE_EXECUTION;
1988 }
1989 }
1991 // Last unguard failed or not unguarding
1992 tty->print_raw_cr("Execution protection violation");
1993 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
1994 exceptionInfo->ContextRecord);
1995 return EXCEPTION_CONTINUE_SEARCH;
1996 }
1997 }
1998 #endif // _WIN64
2000 // Check to see if we caught the safepoint code in the
2001 // process of write protecting the memory serialization page.
2002 // It write enables the page immediately after protecting it
2003 // so just return.
2004 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2005 JavaThread* thread = (JavaThread*) t;
2006 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2007 address addr = (address) exceptionRecord->ExceptionInformation[1];
2008 if ( os::is_memory_serialize_page(thread, addr) ) {
2009 // Block current thread until the memory serialize page permission restored.
2010 os::block_on_serialize_page_trap();
2011 return EXCEPTION_CONTINUE_EXECUTION;
2012 }
2013 }
2016 if (t != NULL && t->is_Java_thread()) {
2017 JavaThread* thread = (JavaThread*) t;
2018 bool in_java = thread->thread_state() == _thread_in_Java;
2020 // Handle potential stack overflows up front.
2021 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2022 if (os::uses_stack_guard_pages()) {
2023 #ifdef _M_IA64
2024 //
2025 // If it's a legal stack address continue, Windows will map it in.
2026 //
2027 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2028 address addr = (address) exceptionRecord->ExceptionInformation[1];
2029 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() )
2030 return EXCEPTION_CONTINUE_EXECUTION;
2032 // The register save area is the same size as the memory stack
2033 // and starts at the page just above the start of the memory stack.
2034 // If we get a fault in this area, we've run out of register
2035 // stack. If we are in java, try throwing a stack overflow exception.
2036 if (addr > thread->stack_base() &&
2037 addr <= (thread->stack_base()+thread->stack_size()) ) {
2038 char buf[256];
2039 jio_snprintf(buf, sizeof(buf),
2040 "Register stack overflow, addr:%p, stack_base:%p\n",
2041 addr, thread->stack_base() );
2042 tty->print_raw_cr(buf);
2043 // If not in java code, return and hope for the best.
2044 return in_java ? Handle_Exception(exceptionInfo,
2045 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2046 : EXCEPTION_CONTINUE_EXECUTION;
2047 }
2048 #endif
2049 if (thread->stack_yellow_zone_enabled()) {
2050 // Yellow zone violation. The o/s has unprotected the first yellow
2051 // zone page for us. Note: must call disable_stack_yellow_zone to
2052 // update the enabled status, even if the zone contains only one page.
2053 thread->disable_stack_yellow_zone();
2054 // If not in java code, return and hope for the best.
2055 return in_java ? Handle_Exception(exceptionInfo,
2056 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2057 : EXCEPTION_CONTINUE_EXECUTION;
2058 } else {
2059 // Fatal red zone violation.
2060 thread->disable_stack_red_zone();
2061 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2062 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2063 exceptionInfo->ContextRecord);
2064 return EXCEPTION_CONTINUE_SEARCH;
2065 }
2066 } else if (in_java) {
2067 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2068 // a one-time-only guard page, which it has released to us. The next
2069 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2070 return Handle_Exception(exceptionInfo,
2071 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2072 } else {
2073 // Can only return and hope for the best. Further stack growth will
2074 // result in an ACCESS_VIOLATION.
2075 return EXCEPTION_CONTINUE_EXECUTION;
2076 }
2077 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2078 // Either stack overflow or null pointer exception.
2079 if (in_java) {
2080 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2081 address addr = (address) exceptionRecord->ExceptionInformation[1];
2082 address stack_end = thread->stack_base() - thread->stack_size();
2083 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2084 // Stack overflow.
2085 assert(!os::uses_stack_guard_pages(),
2086 "should be caught by red zone code above.");
2087 return Handle_Exception(exceptionInfo,
2088 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2089 }
2090 //
2091 // Check for safepoint polling and implicit null
2092 // We only expect null pointers in the stubs (vtable)
2093 // the rest are checked explicitly now.
2094 //
2095 CodeBlob* cb = CodeCache::find_blob(pc);
2096 if (cb != NULL) {
2097 if (os::is_poll_address(addr)) {
2098 address stub = SharedRuntime::get_poll_stub(pc);
2099 return Handle_Exception(exceptionInfo, stub);
2100 }
2101 }
2102 {
2103 #ifdef _WIN64
2104 //
2105 // If it's a legal stack address map the entire region in
2106 //
2107 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2108 address addr = (address) exceptionRecord->ExceptionInformation[1];
2109 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2110 addr = (address)((uintptr_t)addr &
2111 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2112 os::commit_memory( (char *)addr, thread->stack_base() - addr );
2113 return EXCEPTION_CONTINUE_EXECUTION;
2114 }
2115 else
2116 #endif
2117 {
2118 // Null pointer exception.
2119 #ifdef _M_IA64
2120 // We catch register stack overflows in compiled code by doing
2121 // an explicit compare and executing a st8(G0, G0) if the
2122 // BSP enters into our guard area. We test for the overflow
2123 // condition and fall into the normal null pointer exception
2124 // code if BSP hasn't overflowed.
2125 if ( in_java ) {
2126 if(thread->register_stack_overflow()) {
2127 assert((address)exceptionInfo->ContextRecord->IntS3 ==
2128 thread->register_stack_limit(),
2129 "GR7 doesn't contain register_stack_limit");
2130 // Disable the yellow zone which sets the state that
2131 // we've got a stack overflow problem.
2132 if (thread->stack_yellow_zone_enabled()) {
2133 thread->disable_stack_yellow_zone();
2134 }
2135 // Give us some room to process the exception
2136 thread->disable_register_stack_guard();
2137 // Update GR7 with the new limit so we can continue running
2138 // compiled code.
2139 exceptionInfo->ContextRecord->IntS3 =
2140 (ULONGLONG)thread->register_stack_limit();
2141 return Handle_Exception(exceptionInfo,
2142 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2143 } else {
2144 //
2145 // Check for implicit null
2146 // We only expect null pointers in the stubs (vtable)
2147 // the rest are checked explicitly now.
2148 //
2149 CodeBlob* cb = CodeCache::find_blob(pc);
2150 if (cb != NULL) {
2151 if (VtableStubs::stub_containing(pc) != NULL) {
2152 if (((uintptr_t)addr) < os::vm_page_size() ) {
2153 // an access to the first page of VM--assume it is a null pointer
2154 return Handle_Exception(exceptionInfo,
2155 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL));
2156 }
2157 }
2158 }
2159 }
2160 } // in_java
2162 // IA64 doesn't use implicit null checking yet. So we shouldn't
2163 // get here.
2164 tty->print_raw_cr("Access violation, possible null pointer exception");
2165 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2166 exceptionInfo->ContextRecord);
2167 return EXCEPTION_CONTINUE_SEARCH;
2168 #else /* !IA64 */
2170 // Windows 98 reports faulting addresses incorrectly
2171 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2172 !os::win32::is_nt()) {
2173 return Handle_Exception(exceptionInfo,
2174 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL));
2175 }
2176 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2177 exceptionInfo->ContextRecord);
2178 return EXCEPTION_CONTINUE_SEARCH;
2179 #endif
2180 }
2181 }
2182 }
2184 #ifdef _WIN64
2185 // Special care for fast JNI field accessors.
2186 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2187 // in and the heap gets shrunk before the field access.
2188 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2189 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2190 if (addr != (address)-1) {
2191 return Handle_Exception(exceptionInfo, addr);
2192 }
2193 }
2194 #endif
2196 #ifdef _WIN64
2197 // Windows will sometimes generate an access violation
2198 // when we call malloc. Since we use VectoredExceptions
2199 // on 64 bit platforms, we see this exception. We must
2200 // pass this exception on so Windows can recover.
2201 // We check to see if the pc of the fault is in NTDLL.DLL
2202 // if so, we pass control on to Windows for handling.
2203 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH;
2204 #endif
2206 // Stack overflow or null pointer exception in native code.
2207 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2208 exceptionInfo->ContextRecord);
2209 return EXCEPTION_CONTINUE_SEARCH;
2210 }
2212 if (in_java) {
2213 switch (exception_code) {
2214 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2215 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2217 case EXCEPTION_INT_OVERFLOW:
2218 return Handle_IDiv_Exception(exceptionInfo);
2220 } // switch
2221 }
2222 #ifndef _WIN64
2223 if ((thread->thread_state() == _thread_in_Java) ||
2224 (thread->thread_state() == _thread_in_native) )
2225 {
2226 LONG result=Handle_FLT_Exception(exceptionInfo);
2227 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2228 }
2229 #endif //_WIN64
2230 }
2232 if (exception_code != EXCEPTION_BREAKPOINT) {
2233 #ifndef _WIN64
2234 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2235 exceptionInfo->ContextRecord);
2236 #else
2237 // Itanium Windows uses a VectoredExceptionHandler
2238 // Which means that C++ programatic exception handlers (try/except)
2239 // will get here. Continue the search for the right except block if
2240 // the exception code is not a fatal code.
2241 switch ( exception_code ) {
2242 case EXCEPTION_ACCESS_VIOLATION:
2243 case EXCEPTION_STACK_OVERFLOW:
2244 case EXCEPTION_ILLEGAL_INSTRUCTION:
2245 case EXCEPTION_ILLEGAL_INSTRUCTION_2:
2246 case EXCEPTION_INT_OVERFLOW:
2247 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2248 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2249 exceptionInfo->ContextRecord);
2250 }
2251 break;
2252 default:
2253 break;
2254 }
2255 #endif
2256 }
2257 return EXCEPTION_CONTINUE_SEARCH;
2258 }
2260 #ifndef _WIN64
2261 // Special care for fast JNI accessors.
2262 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2263 // the heap gets shrunk before the field access.
2264 // Need to install our own structured exception handler since native code may
2265 // install its own.
2266 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2267 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2268 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2269 address pc = (address) exceptionInfo->ContextRecord->Eip;
2270 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2271 if (addr != (address)-1) {
2272 return Handle_Exception(exceptionInfo, addr);
2273 }
2274 }
2275 return EXCEPTION_CONTINUE_SEARCH;
2276 }
2278 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2279 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2280 __try { \
2281 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2282 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2283 } \
2284 return 0; \
2285 }
2287 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2288 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2289 DEFINE_FAST_GETFIELD(jchar, char, Char)
2290 DEFINE_FAST_GETFIELD(jshort, short, Short)
2291 DEFINE_FAST_GETFIELD(jint, int, Int)
2292 DEFINE_FAST_GETFIELD(jlong, long, Long)
2293 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2294 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2296 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2297 switch (type) {
2298 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2299 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2300 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2301 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2302 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2303 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2304 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2305 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2306 default: ShouldNotReachHere();
2307 }
2308 return (address)-1;
2309 }
2310 #endif
2312 // Virtual Memory
2314 int os::vm_page_size() { return os::win32::vm_page_size(); }
2315 int os::vm_allocation_granularity() {
2316 return os::win32::vm_allocation_granularity();
2317 }
2319 // Windows large page support is available on Windows 2003. In order to use
2320 // large page memory, the administrator must first assign additional privilege
2321 // to the user:
2322 // + select Control Panel -> Administrative Tools -> Local Security Policy
2323 // + select Local Policies -> User Rights Assignment
2324 // + double click "Lock pages in memory", add users and/or groups
2325 // + reboot
2326 // Note the above steps are needed for administrator as well, as administrators
2327 // by default do not have the privilege to lock pages in memory.
2328 //
2329 // Note about Windows 2003: although the API supports committing large page
2330 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2331 // scenario, I found through experiment it only uses large page if the entire
2332 // memory region is reserved and committed in a single VirtualAlloc() call.
2333 // This makes Windows large page support more or less like Solaris ISM, in
2334 // that the entire heap must be committed upfront. This probably will change
2335 // in the future, if so the code below needs to be revisited.
2337 #ifndef MEM_LARGE_PAGES
2338 #define MEM_LARGE_PAGES 0x20000000
2339 #endif
2341 // GetLargePageMinimum is only available on Windows 2003. The other functions
2342 // are available on NT but not on Windows 98/Me. We have to resolve them at
2343 // runtime.
2344 typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void);
2345 typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type)
2346 (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
2347 typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE);
2348 typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID);
2350 static GetLargePageMinimum_func_type _GetLargePageMinimum;
2351 static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges;
2352 static OpenProcessToken_func_type _OpenProcessToken;
2353 static LookupPrivilegeValue_func_type _LookupPrivilegeValue;
2355 static HINSTANCE _kernel32;
2356 static HINSTANCE _advapi32;
2357 static HANDLE _hProcess;
2358 static HANDLE _hToken;
2360 static size_t _large_page_size = 0;
2362 static bool resolve_functions_for_large_page_init() {
2363 _kernel32 = LoadLibrary("kernel32.dll");
2364 if (_kernel32 == NULL) return false;
2366 _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type,
2367 GetProcAddress(_kernel32, "GetLargePageMinimum"));
2368 if (_GetLargePageMinimum == NULL) return false;
2370 _advapi32 = LoadLibrary("advapi32.dll");
2371 if (_advapi32 == NULL) return false;
2373 _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type,
2374 GetProcAddress(_advapi32, "AdjustTokenPrivileges"));
2375 _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type,
2376 GetProcAddress(_advapi32, "OpenProcessToken"));
2377 _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type,
2378 GetProcAddress(_advapi32, "LookupPrivilegeValueA"));
2379 return _AdjustTokenPrivileges != NULL &&
2380 _OpenProcessToken != NULL &&
2381 _LookupPrivilegeValue != NULL;
2382 }
2384 static bool request_lock_memory_privilege() {
2385 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2386 os::current_process_id());
2388 LUID luid;
2389 if (_hProcess != NULL &&
2390 _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2391 _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2393 TOKEN_PRIVILEGES tp;
2394 tp.PrivilegeCount = 1;
2395 tp.Privileges[0].Luid = luid;
2396 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2398 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2399 // privilege. Check GetLastError() too. See MSDN document.
2400 if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2401 (GetLastError() == ERROR_SUCCESS)) {
2402 return true;
2403 }
2404 }
2406 return false;
2407 }
2409 static void cleanup_after_large_page_init() {
2410 _GetLargePageMinimum = NULL;
2411 _AdjustTokenPrivileges = NULL;
2412 _OpenProcessToken = NULL;
2413 _LookupPrivilegeValue = NULL;
2414 if (_kernel32) FreeLibrary(_kernel32);
2415 _kernel32 = NULL;
2416 if (_advapi32) FreeLibrary(_advapi32);
2417 _advapi32 = NULL;
2418 if (_hProcess) CloseHandle(_hProcess);
2419 _hProcess = NULL;
2420 if (_hToken) CloseHandle(_hToken);
2421 _hToken = NULL;
2422 }
2424 bool os::large_page_init() {
2425 if (!UseLargePages) return false;
2427 // print a warning if any large page related flag is specified on command line
2428 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2429 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2430 bool success = false;
2432 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2433 if (resolve_functions_for_large_page_init()) {
2434 if (request_lock_memory_privilege()) {
2435 size_t s = _GetLargePageMinimum();
2436 if (s) {
2437 #if defined(IA32) || defined(AMD64)
2438 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2439 WARN("JVM cannot use large pages bigger than 4mb.");
2440 } else {
2441 #endif
2442 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2443 _large_page_size = LargePageSizeInBytes;
2444 } else {
2445 _large_page_size = s;
2446 }
2447 success = true;
2448 #if defined(IA32) || defined(AMD64)
2449 }
2450 #endif
2451 } else {
2452 WARN("Large page is not supported by the processor.");
2453 }
2454 } else {
2455 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2456 }
2457 } else {
2458 WARN("Large page is not supported by the operating system.");
2459 }
2460 #undef WARN
2462 const size_t default_page_size = (size_t) vm_page_size();
2463 if (success && _large_page_size > default_page_size) {
2464 _page_sizes[0] = _large_page_size;
2465 _page_sizes[1] = default_page_size;
2466 _page_sizes[2] = 0;
2467 }
2469 cleanup_after_large_page_init();
2470 return success;
2471 }
2473 // On win32, one cannot release just a part of reserved memory, it's an
2474 // all or nothing deal. When we split a reservation, we must break the
2475 // reservation into two reservations.
2476 void os::split_reserved_memory(char *base, size_t size, size_t split,
2477 bool realloc) {
2478 if (size > 0) {
2479 release_memory(base, size);
2480 if (realloc) {
2481 reserve_memory(split, base);
2482 }
2483 if (size != split) {
2484 reserve_memory(size - split, base + split);
2485 }
2486 }
2487 }
2489 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
2490 assert((size_t)addr % os::vm_allocation_granularity() == 0,
2491 "reserve alignment");
2492 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
2493 char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE,
2494 PAGE_EXECUTE_READWRITE);
2495 assert(res == NULL || addr == NULL || addr == res,
2496 "Unexpected address from reserve.");
2497 return res;
2498 }
2500 // Reserve memory at an arbitrary address, only if that area is
2501 // available (and not reserved for something else).
2502 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2503 // Windows os::reserve_memory() fails of the requested address range is
2504 // not avilable.
2505 return reserve_memory(bytes, requested_addr);
2506 }
2508 size_t os::large_page_size() {
2509 return _large_page_size;
2510 }
2512 bool os::can_commit_large_page_memory() {
2513 // Windows only uses large page memory when the entire region is reserved
2514 // and committed in a single VirtualAlloc() call. This may change in the
2515 // future, but with Windows 2003 it's not possible to commit on demand.
2516 return false;
2517 }
2519 bool os::can_execute_large_page_memory() {
2520 return true;
2521 }
2523 char* os::reserve_memory_special(size_t bytes) {
2524 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
2525 char * res = (char *)VirtualAlloc(NULL, bytes, flag, PAGE_EXECUTE_READWRITE);
2526 return res;
2527 }
2529 bool os::release_memory_special(char* base, size_t bytes) {
2530 return release_memory(base, bytes);
2531 }
2533 void os::print_statistics() {
2534 }
2536 bool os::commit_memory(char* addr, size_t bytes) {
2537 if (bytes == 0) {
2538 // Don't bother the OS with noops.
2539 return true;
2540 }
2541 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
2542 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
2543 // Don't attempt to print anything if the OS call fails. We're
2544 // probably low on resources, so the print itself may cause crashes.
2545 return VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_EXECUTE_READWRITE) != NULL;
2546 }
2548 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint) {
2549 return commit_memory(addr, size);
2550 }
2552 bool os::uncommit_memory(char* addr, size_t bytes) {
2553 if (bytes == 0) {
2554 // Don't bother the OS with noops.
2555 return true;
2556 }
2557 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
2558 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
2559 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0;
2560 }
2562 bool os::release_memory(char* addr, size_t bytes) {
2563 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
2564 }
2566 bool os::protect_memory(char* addr, size_t bytes) {
2567 DWORD old_status;
2568 return VirtualProtect(addr, bytes, PAGE_READONLY, &old_status) != 0;
2569 }
2571 bool os::guard_memory(char* addr, size_t bytes) {
2572 DWORD old_status;
2573 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE | PAGE_GUARD, &old_status) != 0;
2574 }
2576 bool os::unguard_memory(char* addr, size_t bytes) {
2577 DWORD old_status;
2578 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &old_status) != 0;
2579 }
2581 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
2582 void os::free_memory(char *addr, size_t bytes) { }
2583 void os::numa_make_global(char *addr, size_t bytes) { }
2584 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
2585 bool os::numa_topology_changed() { return false; }
2586 size_t os::numa_get_groups_num() { return 1; }
2587 int os::numa_get_group_id() { return 0; }
2588 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2589 if (size > 0) {
2590 ids[0] = 0;
2591 return 1;
2592 }
2593 return 0;
2594 }
2596 bool os::get_page_info(char *start, page_info* info) {
2597 return false;
2598 }
2600 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2601 return end;
2602 }
2604 char* os::non_memory_address_word() {
2605 // Must never look like an address returned by reserve_memory,
2606 // even in its subfields (as defined by the CPU immediate fields,
2607 // if the CPU splits constants across multiple instructions).
2608 return (char*)-1;
2609 }
2611 #define MAX_ERROR_COUNT 100
2612 #define SYS_THREAD_ERROR 0xffffffffUL
2614 void os::pd_start_thread(Thread* thread) {
2615 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
2616 // Returns previous suspend state:
2617 // 0: Thread was not suspended
2618 // 1: Thread is running now
2619 // >1: Thread is still suspended.
2620 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
2621 }
2623 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2624 return ::read(fd, buf, nBytes);
2625 }
2627 class HighResolutionInterval {
2628 // The default timer resolution seems to be 10 milliseconds.
2629 // (Where is this written down?)
2630 // If someone wants to sleep for only a fraction of the default,
2631 // then we set the timer resolution down to 1 millisecond for
2632 // the duration of their interval.
2633 // We carefully set the resolution back, since otherwise we
2634 // seem to incur an overhead (3%?) that we don't need.
2635 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
2636 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
2637 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
2638 // timeBeginPeriod() if the relative error exceeded some threshold.
2639 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
2640 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
2641 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
2642 // resolution timers running.
2643 private:
2644 jlong resolution;
2645 public:
2646 HighResolutionInterval(jlong ms) {
2647 resolution = ms % 10L;
2648 if (resolution != 0) {
2649 MMRESULT result = timeBeginPeriod(1L);
2650 }
2651 }
2652 ~HighResolutionInterval() {
2653 if (resolution != 0) {
2654 MMRESULT result = timeEndPeriod(1L);
2655 }
2656 resolution = 0L;
2657 }
2658 };
2660 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
2661 jlong limit = (jlong) MAXDWORD;
2663 while(ms > limit) {
2664 int res;
2665 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
2666 return res;
2667 ms -= limit;
2668 }
2670 assert(thread == Thread::current(), "thread consistency check");
2671 OSThread* osthread = thread->osthread();
2672 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
2673 int result;
2674 if (interruptable) {
2675 assert(thread->is_Java_thread(), "must be java thread");
2676 JavaThread *jt = (JavaThread *) thread;
2677 ThreadBlockInVM tbivm(jt);
2679 jt->set_suspend_equivalent();
2680 // cleared by handle_special_suspend_equivalent_condition() or
2681 // java_suspend_self() via check_and_wait_while_suspended()
2683 HANDLE events[1];
2684 events[0] = osthread->interrupt_event();
2685 HighResolutionInterval *phri=NULL;
2686 if(!ForceTimeHighResolution)
2687 phri = new HighResolutionInterval( ms );
2688 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
2689 result = OS_TIMEOUT;
2690 } else {
2691 ResetEvent(osthread->interrupt_event());
2692 osthread->set_interrupted(false);
2693 result = OS_INTRPT;
2694 }
2695 delete phri; //if it is NULL, harmless
2697 // were we externally suspended while we were waiting?
2698 jt->check_and_wait_while_suspended();
2699 } else {
2700 assert(!thread->is_Java_thread(), "must not be java thread");
2701 Sleep((long) ms);
2702 result = OS_TIMEOUT;
2703 }
2704 return result;
2705 }
2707 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2708 void os::infinite_sleep() {
2709 while (true) { // sleep forever ...
2710 Sleep(100000); // ... 100 seconds at a time
2711 }
2712 }
2714 typedef BOOL (WINAPI * STTSignature)(void) ;
2716 os::YieldResult os::NakedYield() {
2717 // Use either SwitchToThread() or Sleep(0)
2718 // Consider passing back the return value from SwitchToThread().
2719 // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread.
2720 // In that case we revert to Sleep(0).
2721 static volatile STTSignature stt = (STTSignature) 1 ;
2723 if (stt == ((STTSignature) 1)) {
2724 stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ;
2725 // It's OK if threads race during initialization as the operation above is idempotent.
2726 }
2727 if (stt != NULL) {
2728 return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
2729 } else {
2730 Sleep (0) ;
2731 }
2732 return os::YIELD_UNKNOWN ;
2733 }
2735 void os::yield() { os::NakedYield(); }
2737 void os::yield_all(int attempts) {
2738 // Yields to all threads, including threads with lower priorities
2739 Sleep(1);
2740 }
2742 // Win32 only gives you access to seven real priorities at a time,
2743 // so we compress Java's ten down to seven. It would be better
2744 // if we dynamically adjusted relative priorities.
2746 int os::java_to_os_priority[MaxPriority + 1] = {
2747 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
2748 THREAD_PRIORITY_LOWEST, // 1 MinPriority
2749 THREAD_PRIORITY_LOWEST, // 2
2750 THREAD_PRIORITY_BELOW_NORMAL, // 3
2751 THREAD_PRIORITY_BELOW_NORMAL, // 4
2752 THREAD_PRIORITY_NORMAL, // 5 NormPriority
2753 THREAD_PRIORITY_NORMAL, // 6
2754 THREAD_PRIORITY_ABOVE_NORMAL, // 7
2755 THREAD_PRIORITY_ABOVE_NORMAL, // 8
2756 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
2757 THREAD_PRIORITY_HIGHEST // 10 MaxPriority
2758 };
2760 int prio_policy1[MaxPriority + 1] = {
2761 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
2762 THREAD_PRIORITY_LOWEST, // 1 MinPriority
2763 THREAD_PRIORITY_LOWEST, // 2
2764 THREAD_PRIORITY_BELOW_NORMAL, // 3
2765 THREAD_PRIORITY_BELOW_NORMAL, // 4
2766 THREAD_PRIORITY_NORMAL, // 5 NormPriority
2767 THREAD_PRIORITY_ABOVE_NORMAL, // 6
2768 THREAD_PRIORITY_ABOVE_NORMAL, // 7
2769 THREAD_PRIORITY_HIGHEST, // 8
2770 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
2771 THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority
2772 };
2774 static int prio_init() {
2775 // If ThreadPriorityPolicy is 1, switch tables
2776 if (ThreadPriorityPolicy == 1) {
2777 int i;
2778 for (i = 0; i < MaxPriority + 1; i++) {
2779 os::java_to_os_priority[i] = prio_policy1[i];
2780 }
2781 }
2782 return 0;
2783 }
2785 OSReturn os::set_native_priority(Thread* thread, int priority) {
2786 if (!UseThreadPriorities) return OS_OK;
2787 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
2788 return ret ? OS_OK : OS_ERR;
2789 }
2791 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
2792 if ( !UseThreadPriorities ) {
2793 *priority_ptr = java_to_os_priority[NormPriority];
2794 return OS_OK;
2795 }
2796 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
2797 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
2798 assert(false, "GetThreadPriority failed");
2799 return OS_ERR;
2800 }
2801 *priority_ptr = os_prio;
2802 return OS_OK;
2803 }
2806 // Hint to the underlying OS that a task switch would not be good.
2807 // Void return because it's a hint and can fail.
2808 void os::hint_no_preempt() {}
2810 void os::interrupt(Thread* thread) {
2811 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
2812 "possibility of dangling Thread pointer");
2814 OSThread* osthread = thread->osthread();
2815 osthread->set_interrupted(true);
2816 // More than one thread can get here with the same value of osthread,
2817 // resulting in multiple notifications. We do, however, want the store
2818 // to interrupted() to be visible to other threads before we post
2819 // the interrupt event.
2820 OrderAccess::release();
2821 SetEvent(osthread->interrupt_event());
2822 // For JSR166: unpark after setting status
2823 if (thread->is_Java_thread())
2824 ((JavaThread*)thread)->parker()->unpark();
2826 ParkEvent * ev = thread->_ParkEvent ;
2827 if (ev != NULL) ev->unpark() ;
2829 }
2832 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
2833 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
2834 "possibility of dangling Thread pointer");
2836 OSThread* osthread = thread->osthread();
2837 bool interrupted;
2838 interrupted = osthread->interrupted();
2839 if (clear_interrupted == true) {
2840 osthread->set_interrupted(false);
2841 ResetEvent(osthread->interrupt_event());
2842 } // Otherwise leave the interrupted state alone
2844 return interrupted;
2845 }
2847 // Get's a pc (hint) for a running thread. Currently used only for profiling.
2848 ExtendedPC os::get_thread_pc(Thread* thread) {
2849 CONTEXT context;
2850 context.ContextFlags = CONTEXT_CONTROL;
2851 HANDLE handle = thread->osthread()->thread_handle();
2852 #ifdef _M_IA64
2853 assert(0, "Fix get_thread_pc");
2854 return ExtendedPC(NULL);
2855 #else
2856 if (GetThreadContext(handle, &context)) {
2857 #ifdef _M_AMD64
2858 return ExtendedPC((address) context.Rip);
2859 #else
2860 return ExtendedPC((address) context.Eip);
2861 #endif
2862 } else {
2863 return ExtendedPC(NULL);
2864 }
2865 #endif
2866 }
2868 // GetCurrentThreadId() returns DWORD
2869 intx os::current_thread_id() { return GetCurrentThreadId(); }
2871 static int _initial_pid = 0;
2873 int os::current_process_id()
2874 {
2875 return (_initial_pid ? _initial_pid : _getpid());
2876 }
2878 int os::win32::_vm_page_size = 0;
2879 int os::win32::_vm_allocation_granularity = 0;
2880 int os::win32::_processor_type = 0;
2881 // Processor level is not available on non-NT systems, use vm_version instead
2882 int os::win32::_processor_level = 0;
2883 julong os::win32::_physical_memory = 0;
2884 size_t os::win32::_default_stack_size = 0;
2886 intx os::win32::_os_thread_limit = 0;
2887 volatile intx os::win32::_os_thread_count = 0;
2889 bool os::win32::_is_nt = false;
2892 void os::win32::initialize_system_info() {
2893 SYSTEM_INFO si;
2894 GetSystemInfo(&si);
2895 _vm_page_size = si.dwPageSize;
2896 _vm_allocation_granularity = si.dwAllocationGranularity;
2897 _processor_type = si.dwProcessorType;
2898 _processor_level = si.wProcessorLevel;
2899 _processor_count = si.dwNumberOfProcessors;
2901 MEMORYSTATUS ms;
2902 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
2903 // dwMemoryLoad (% of memory in use)
2904 GlobalMemoryStatus(&ms);
2905 _physical_memory = ms.dwTotalPhys;
2907 OSVERSIONINFO oi;
2908 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
2909 GetVersionEx(&oi);
2910 switch(oi.dwPlatformId) {
2911 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
2912 case VER_PLATFORM_WIN32_NT: _is_nt = true; break;
2913 default: fatal("Unknown platform");
2914 }
2916 _default_stack_size = os::current_stack_size();
2917 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
2918 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
2919 "stack size not a multiple of page size");
2921 initialize_performance_counter();
2923 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
2924 // known to deadlock the system, if the VM issues to thread operations with
2925 // a too high frequency, e.g., such as changing the priorities.
2926 // The 6000 seems to work well - no deadlocks has been notices on the test
2927 // programs that we have seen experience this problem.
2928 if (!os::win32::is_nt()) {
2929 StarvationMonitorInterval = 6000;
2930 }
2931 }
2934 void os::win32::setmode_streams() {
2935 _setmode(_fileno(stdin), _O_BINARY);
2936 _setmode(_fileno(stdout), _O_BINARY);
2937 _setmode(_fileno(stderr), _O_BINARY);
2938 }
2941 int os::message_box(const char* title, const char* message) {
2942 int result = MessageBox(NULL, message, title,
2943 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
2944 return result == IDYES;
2945 }
2947 int os::allocate_thread_local_storage() {
2948 return TlsAlloc();
2949 }
2952 void os::free_thread_local_storage(int index) {
2953 TlsFree(index);
2954 }
2957 void os::thread_local_storage_at_put(int index, void* value) {
2958 TlsSetValue(index, value);
2959 assert(thread_local_storage_at(index) == value, "Just checking");
2960 }
2963 void* os::thread_local_storage_at(int index) {
2964 return TlsGetValue(index);
2965 }
2968 #ifndef PRODUCT
2969 #ifndef _WIN64
2970 // Helpers to check whether NX protection is enabled
2971 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
2972 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
2973 pex->ExceptionRecord->NumberParameters > 0 &&
2974 pex->ExceptionRecord->ExceptionInformation[0] ==
2975 EXCEPTION_INFO_EXEC_VIOLATION) {
2976 return EXCEPTION_EXECUTE_HANDLER;
2977 }
2978 return EXCEPTION_CONTINUE_SEARCH;
2979 }
2981 void nx_check_protection() {
2982 // If NX is enabled we'll get an exception calling into code on the stack
2983 char code[] = { (char)0xC3 }; // ret
2984 void *code_ptr = (void *)code;
2985 __try {
2986 __asm call code_ptr
2987 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
2988 tty->print_raw_cr("NX protection detected.");
2989 }
2990 }
2991 #endif // _WIN64
2992 #endif // PRODUCT
2994 // this is called _before_ the global arguments have been parsed
2995 void os::init(void) {
2996 _initial_pid = _getpid();
2998 init_random(1234567);
3000 win32::initialize_system_info();
3001 win32::setmode_streams();
3002 init_page_sizes((size_t) win32::vm_page_size());
3004 // For better scalability on MP systems (must be called after initialize_system_info)
3005 #ifndef PRODUCT
3006 if (is_MP()) {
3007 NoYieldsInMicrolock = true;
3008 }
3009 #endif
3010 // Initialize main_process and main_thread
3011 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3012 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3013 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3014 fatal("DuplicateHandle failed\n");
3015 }
3016 main_thread_id = (int) GetCurrentThreadId();
3017 }
3019 // To install functions for atexit processing
3020 extern "C" {
3021 static void perfMemory_exit_helper() {
3022 perfMemory_exit();
3023 }
3024 }
3027 // this is called _after_ the global arguments have been parsed
3028 jint os::init_2(void) {
3029 // Allocate a single page and mark it as readable for safepoint polling
3030 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3031 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3033 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3034 guarantee( return_page != NULL, "Commit Failed for polling page");
3036 os::set_polling_page( polling_page );
3038 #ifndef PRODUCT
3039 if( Verbose && PrintMiscellaneous )
3040 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3041 #endif
3043 if (!UseMembar) {
3044 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_EXECUTE_READWRITE);
3045 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3047 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_EXECUTE_READWRITE);
3048 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3050 os::set_memory_serialize_page( mem_serialize_page );
3052 #ifndef PRODUCT
3053 if(Verbose && PrintMiscellaneous)
3054 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3055 #endif
3056 }
3058 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init());
3060 // Setup Windows Exceptions
3062 // On Itanium systems, Structured Exception Handling does not
3063 // work since stack frames must be walkable by the OS. Since
3064 // much of our code is dynamically generated, and we do not have
3065 // proper unwind .xdata sections, the system simply exits
3066 // rather than delivering the exception. To work around
3067 // this we use VectorExceptions instead.
3068 #ifdef _WIN64
3069 if (UseVectoredExceptions) {
3070 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter);
3071 }
3072 #endif
3074 // for debugging float code generation bugs
3075 if (ForceFloatExceptions) {
3076 #ifndef _WIN64
3077 static long fp_control_word = 0;
3078 __asm { fstcw fp_control_word }
3079 // see Intel PPro Manual, Vol. 2, p 7-16
3080 const long precision = 0x20;
3081 const long underflow = 0x10;
3082 const long overflow = 0x08;
3083 const long zero_div = 0x04;
3084 const long denorm = 0x02;
3085 const long invalid = 0x01;
3086 fp_control_word |= invalid;
3087 __asm { fldcw fp_control_word }
3088 #endif
3089 }
3091 // Initialize HPI.
3092 jint hpi_result = hpi::initialize();
3093 if (hpi_result != JNI_OK) { return hpi_result; }
3095 // If stack_commit_size is 0, windows will reserve the default size,
3096 // but only commit a small portion of it.
3097 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3098 size_t default_reserve_size = os::win32::default_stack_size();
3099 size_t actual_reserve_size = stack_commit_size;
3100 if (stack_commit_size < default_reserve_size) {
3101 // If stack_commit_size == 0, we want this too
3102 actual_reserve_size = default_reserve_size;
3103 }
3105 JavaThread::set_stack_size_at_create(stack_commit_size);
3107 // Calculate theoretical max. size of Threads to guard gainst artifical
3108 // out-of-memory situations, where all available address-space has been
3109 // reserved by thread stacks.
3110 assert(actual_reserve_size != 0, "Must have a stack");
3112 // Calculate the thread limit when we should start doing Virtual Memory
3113 // banging. Currently when the threads will have used all but 200Mb of space.
3114 //
3115 // TODO: consider performing a similar calculation for commit size instead
3116 // as reserve size, since on a 64-bit platform we'll run into that more
3117 // often than running out of virtual memory space. We can use the
3118 // lower value of the two calculations as the os_thread_limit.
3119 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3120 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3122 // at exit methods are called in the reverse order of their registration.
3123 // there is no limit to the number of functions registered. atexit does
3124 // not set errno.
3126 if (PerfAllowAtExitRegistration) {
3127 // only register atexit functions if PerfAllowAtExitRegistration is set.
3128 // atexit functions can be delayed until process exit time, which
3129 // can be problematic for embedded VM situations. Embedded VMs should
3130 // call DestroyJavaVM() to assure that VM resources are released.
3132 // note: perfMemory_exit_helper atexit function may be removed in
3133 // the future if the appropriate cleanup code can be added to the
3134 // VM_Exit VMOperation's doit method.
3135 if (atexit(perfMemory_exit_helper) != 0) {
3136 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3137 }
3138 }
3140 // initialize PSAPI or ToolHelp for fatal error handler
3141 if (win32::is_nt()) _init_psapi();
3142 else _init_toolhelp();
3144 #ifndef _WIN64
3145 // Print something if NX is enabled (win32 on AMD64)
3146 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
3147 #endif
3149 // initialize thread priority policy
3150 prio_init();
3152 return JNI_OK;
3153 }
3156 // Mark the polling page as unreadable
3157 void os::make_polling_page_unreadable(void) {
3158 DWORD old_status;
3159 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
3160 fatal("Could not disable polling page");
3161 };
3163 // Mark the polling page as readable
3164 void os::make_polling_page_readable(void) {
3165 DWORD old_status;
3166 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
3167 fatal("Could not enable polling page");
3168 };
3171 int os::stat(const char *path, struct stat *sbuf) {
3172 char pathbuf[MAX_PATH];
3173 if (strlen(path) > MAX_PATH - 1) {
3174 errno = ENAMETOOLONG;
3175 return -1;
3176 }
3177 hpi::native_path(strcpy(pathbuf, path));
3178 int ret = ::stat(pathbuf, sbuf);
3179 if (sbuf != NULL && UseUTCFileTimestamp) {
3180 // Fix for 6539723. st_mtime returned from stat() is dependent on
3181 // the system timezone and so can return different values for the
3182 // same file if/when daylight savings time changes. This adjustment
3183 // makes sure the same timestamp is returned regardless of the TZ.
3184 //
3185 // See:
3186 // http://msdn.microsoft.com/library/
3187 // default.asp?url=/library/en-us/sysinfo/base/
3188 // time_zone_information_str.asp
3189 // and
3190 // http://msdn.microsoft.com/library/default.asp?url=
3191 // /library/en-us/sysinfo/base/settimezoneinformation.asp
3192 //
3193 // NOTE: there is a insidious bug here: If the timezone is changed
3194 // after the call to stat() but before 'GetTimeZoneInformation()', then
3195 // the adjustment we do here will be wrong and we'll return the wrong
3196 // value (which will likely end up creating an invalid class data
3197 // archive). Absent a better API for this, or some time zone locking
3198 // mechanism, we'll have to live with this risk.
3199 TIME_ZONE_INFORMATION tz;
3200 DWORD tzid = GetTimeZoneInformation(&tz);
3201 int daylightBias =
3202 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
3203 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
3204 }
3205 return ret;
3206 }
3209 #define FT2INT64(ft) \
3210 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
3213 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3214 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3215 // of a thread.
3216 //
3217 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3218 // the fast estimate available on the platform.
3220 // current_thread_cpu_time() is not optimized for Windows yet
3221 jlong os::current_thread_cpu_time() {
3222 // return user + sys since the cost is the same
3223 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
3224 }
3226 jlong os::thread_cpu_time(Thread* thread) {
3227 // consistent with what current_thread_cpu_time() returns.
3228 return os::thread_cpu_time(thread, true /* user+sys */);
3229 }
3231 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3232 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3233 }
3235 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
3236 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
3237 // If this function changes, os::is_thread_cpu_time_supported() should too
3238 if (os::win32::is_nt()) {
3239 FILETIME CreationTime;
3240 FILETIME ExitTime;
3241 FILETIME KernelTime;
3242 FILETIME UserTime;
3244 if ( GetThreadTimes(thread->osthread()->thread_handle(),
3245 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3246 return -1;
3247 else
3248 if (user_sys_cpu_time) {
3249 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
3250 } else {
3251 return FT2INT64(UserTime) * 100;
3252 }
3253 } else {
3254 return (jlong) timeGetTime() * 1000000;
3255 }
3256 }
3258 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3259 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3260 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3261 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3262 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3263 }
3265 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3266 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3267 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3268 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3269 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3270 }
3272 bool os::is_thread_cpu_time_supported() {
3273 // see os::thread_cpu_time
3274 if (os::win32::is_nt()) {
3275 FILETIME CreationTime;
3276 FILETIME ExitTime;
3277 FILETIME KernelTime;
3278 FILETIME UserTime;
3280 if ( GetThreadTimes(GetCurrentThread(),
3281 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3282 return false;
3283 else
3284 return true;
3285 } else {
3286 return false;
3287 }
3288 }
3290 // Windows does't provide a loadavg primitive so this is stubbed out for now.
3291 // It does have primitives (PDH API) to get CPU usage and run queue length.
3292 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
3293 // If we wanted to implement loadavg on Windows, we have a few options:
3294 //
3295 // a) Query CPU usage and run queue length and "fake" an answer by
3296 // returning the CPU usage if it's under 100%, and the run queue
3297 // length otherwise. It turns out that querying is pretty slow
3298 // on Windows, on the order of 200 microseconds on a fast machine.
3299 // Note that on the Windows the CPU usage value is the % usage
3300 // since the last time the API was called (and the first call
3301 // returns 100%), so we'd have to deal with that as well.
3302 //
3303 // b) Sample the "fake" answer using a sampling thread and store
3304 // the answer in a global variable. The call to loadavg would
3305 // just return the value of the global, avoiding the slow query.
3306 //
3307 // c) Sample a better answer using exponential decay to smooth the
3308 // value. This is basically the algorithm used by UNIX kernels.
3309 //
3310 // Note that sampling thread starvation could affect both (b) and (c).
3311 int os::loadavg(double loadavg[], int nelem) {
3312 return -1;
3313 }
3316 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
3317 bool os::dont_yield() {
3318 return DontYieldALot;
3319 }
3321 // Is a (classpath) directory empty?
3322 bool os::dir_is_empty(const char* path) {
3323 WIN32_FIND_DATA fd;
3324 HANDLE f = FindFirstFile(path, &fd);
3325 if (f == INVALID_HANDLE_VALUE) {
3326 return true;
3327 }
3328 FindClose(f);
3329 return false;
3330 }
3332 // create binary file, rewriting existing file if required
3333 int os::create_binary_file(const char* path, bool rewrite_existing) {
3334 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
3335 if (!rewrite_existing) {
3336 oflags |= _O_EXCL;
3337 }
3338 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
3339 }
3341 // return current position of file pointer
3342 jlong os::current_file_offset(int fd) {
3343 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
3344 }
3346 // move file pointer to the specified offset
3347 jlong os::seek_to_file_offset(int fd, jlong offset) {
3348 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
3349 }
3352 // Map a block of memory.
3353 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
3354 char *addr, size_t bytes, bool read_only,
3355 bool allow_exec) {
3356 HANDLE hFile;
3357 char* base;
3359 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
3360 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
3361 if (hFile == NULL) {
3362 if (PrintMiscellaneous && Verbose) {
3363 DWORD err = GetLastError();
3364 tty->print_cr("CreateFile() failed: GetLastError->%ld.");
3365 }
3366 return NULL;
3367 }
3369 if (allow_exec) {
3370 // CreateFileMapping/MapViewOfFileEx can't map executable memory
3371 // unless it comes from a PE image (which the shared archive is not.)
3372 // Even VirtualProtect refuses to give execute access to mapped memory
3373 // that was not previously executable.
3374 //
3375 // Instead, stick the executable region in anonymous memory. Yuck.
3376 // Penalty is that ~4 pages will not be shareable - in the future
3377 // we might consider DLLizing the shared archive with a proper PE
3378 // header so that mapping executable + sharing is possible.
3380 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
3381 PAGE_READWRITE);
3382 if (base == NULL) {
3383 if (PrintMiscellaneous && Verbose) {
3384 DWORD err = GetLastError();
3385 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
3386 }
3387 CloseHandle(hFile);
3388 return NULL;
3389 }
3391 DWORD bytes_read;
3392 OVERLAPPED overlapped;
3393 overlapped.Offset = (DWORD)file_offset;
3394 overlapped.OffsetHigh = 0;
3395 overlapped.hEvent = NULL;
3396 // ReadFile guarantees that if the return value is true, the requested
3397 // number of bytes were read before returning.
3398 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
3399 if (!res) {
3400 if (PrintMiscellaneous && Verbose) {
3401 DWORD err = GetLastError();
3402 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
3403 }
3404 release_memory(base, bytes);
3405 CloseHandle(hFile);
3406 return NULL;
3407 }
3408 } else {
3409 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
3410 NULL /*file_name*/);
3411 if (hMap == NULL) {
3412 if (PrintMiscellaneous && Verbose) {
3413 DWORD err = GetLastError();
3414 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.");
3415 }
3416 CloseHandle(hFile);
3417 return NULL;
3418 }
3420 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
3421 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
3422 (DWORD)bytes, addr);
3423 if (base == NULL) {
3424 if (PrintMiscellaneous && Verbose) {
3425 DWORD err = GetLastError();
3426 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
3427 }
3428 CloseHandle(hMap);
3429 CloseHandle(hFile);
3430 return NULL;
3431 }
3433 if (CloseHandle(hMap) == 0) {
3434 if (PrintMiscellaneous && Verbose) {
3435 DWORD err = GetLastError();
3436 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
3437 }
3438 CloseHandle(hFile);
3439 return base;
3440 }
3441 }
3443 if (allow_exec) {
3444 DWORD old_protect;
3445 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
3446 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
3448 if (!res) {
3449 if (PrintMiscellaneous && Verbose) {
3450 DWORD err = GetLastError();
3451 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
3452 }
3453 // Don't consider this a hard error, on IA32 even if the
3454 // VirtualProtect fails, we should still be able to execute
3455 CloseHandle(hFile);
3456 return base;
3457 }
3458 }
3460 if (CloseHandle(hFile) == 0) {
3461 if (PrintMiscellaneous && Verbose) {
3462 DWORD err = GetLastError();
3463 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
3464 }
3465 return base;
3466 }
3468 return base;
3469 }
3472 // Remap a block of memory.
3473 char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
3474 char *addr, size_t bytes, bool read_only,
3475 bool allow_exec) {
3476 // This OS does not allow existing memory maps to be remapped so we
3477 // have to unmap the memory before we remap it.
3478 if (!os::unmap_memory(addr, bytes)) {
3479 return NULL;
3480 }
3482 // There is a very small theoretical window between the unmap_memory()
3483 // call above and the map_memory() call below where a thread in native
3484 // code may be able to access an address that is no longer mapped.
3486 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3487 allow_exec);
3488 }
3491 // Unmap a block of memory.
3492 // Returns true=success, otherwise false.
3494 bool os::unmap_memory(char* addr, size_t bytes) {
3495 BOOL result = UnmapViewOfFile(addr);
3496 if (result == 0) {
3497 if (PrintMiscellaneous && Verbose) {
3498 DWORD err = GetLastError();
3499 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
3500 }
3501 return false;
3502 }
3503 return true;
3504 }
3506 void os::pause() {
3507 char filename[MAX_PATH];
3508 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3509 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
3510 } else {
3511 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3512 }
3514 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3515 if (fd != -1) {
3516 struct stat buf;
3517 close(fd);
3518 while (::stat(filename, &buf) == 0) {
3519 Sleep(100);
3520 }
3521 } else {
3522 jio_fprintf(stderr,
3523 "Could not open pause file '%s', continuing immediately.\n", filename);
3524 }
3525 }
3527 // An Event wraps a win32 "CreateEvent" kernel handle.
3528 //
3529 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
3530 //
3531 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
3532 // field, and call CloseHandle() on the win32 event handle. Unpark() would
3533 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
3534 // In addition, an unpark() operation might fetch the handle field, but the
3535 // event could recycle between the fetch and the SetEvent() operation.
3536 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
3537 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
3538 // on an stale but recycled handle would be harmless, but in practice this might
3539 // confuse other non-Sun code, so it's not a viable approach.
3540 //
3541 // 2: Once a win32 event handle is associated with an Event, it remains associated
3542 // with the Event. The event handle is never closed. This could be construed
3543 // as handle leakage, but only up to the maximum # of threads that have been extant
3544 // at any one time. This shouldn't be an issue, as windows platforms typically
3545 // permit a process to have hundreds of thousands of open handles.
3546 //
3547 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
3548 // and release unused handles.
3549 //
3550 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
3551 // It's not clear, however, that we wouldn't be trading one type of leak for another.
3552 //
3553 // 5. Use an RCU-like mechanism (Read-Copy Update).
3554 // Or perhaps something similar to Maged Michael's "Hazard pointers".
3555 //
3556 // We use (2).
3557 //
3558 // TODO-FIXME:
3559 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
3560 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
3561 // to recover from (or at least detect) the dreaded Windows 841176 bug.
3562 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
3563 // into a single win32 CreateEvent() handle.
3564 //
3565 // _Event transitions in park()
3566 // -1 => -1 : illegal
3567 // 1 => 0 : pass - return immediately
3568 // 0 => -1 : block
3569 //
3570 // _Event serves as a restricted-range semaphore :
3571 // -1 : thread is blocked
3572 // 0 : neutral - thread is running or ready
3573 // 1 : signaled - thread is running or ready
3574 //
3575 // Another possible encoding of _Event would be
3576 // with explicit "PARKED" and "SIGNALED" bits.
3578 int os::PlatformEvent::park (jlong Millis) {
3579 guarantee (_ParkHandle != NULL , "Invariant") ;
3580 guarantee (Millis > 0 , "Invariant") ;
3581 int v ;
3583 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
3584 // the initial park() operation.
3586 for (;;) {
3587 v = _Event ;
3588 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
3589 }
3590 guarantee ((v == 0) || (v == 1), "invariant") ;
3591 if (v != 0) return OS_OK ;
3593 // Do this the hard way by blocking ...
3594 // TODO: consider a brief spin here, gated on the success of recent
3595 // spin attempts by this thread.
3596 //
3597 // We decompose long timeouts into series of shorter timed waits.
3598 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
3599 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
3600 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
3601 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
3602 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
3603 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
3604 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
3605 // for the already waited time. This policy does not admit any new outcomes.
3606 // In the future, however, we might want to track the accumulated wait time and
3607 // adjust Millis accordingly if we encounter a spurious wakeup.
3609 const int MAXTIMEOUT = 0x10000000 ;
3610 DWORD rv = WAIT_TIMEOUT ;
3611 while (_Event < 0 && Millis > 0) {
3612 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
3613 if (Millis > MAXTIMEOUT) {
3614 prd = MAXTIMEOUT ;
3615 }
3616 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
3617 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
3618 if (rv == WAIT_TIMEOUT) {
3619 Millis -= prd ;
3620 }
3621 }
3622 v = _Event ;
3623 _Event = 0 ;
3624 OrderAccess::fence() ;
3625 // If we encounter a nearly simultanous timeout expiry and unpark()
3626 // we return OS_OK indicating we awoke via unpark().
3627 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
3628 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
3629 }
3631 void os::PlatformEvent::park () {
3632 guarantee (_ParkHandle != NULL, "Invariant") ;
3633 // Invariant: Only the thread associated with the Event/PlatformEvent
3634 // may call park().
3635 int v ;
3636 for (;;) {
3637 v = _Event ;
3638 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
3639 }
3640 guarantee ((v == 0) || (v == 1), "invariant") ;
3641 if (v != 0) return ;
3643 // Do this the hard way by blocking ...
3644 // TODO: consider a brief spin here, gated on the success of recent
3645 // spin attempts by this thread.
3646 while (_Event < 0) {
3647 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
3648 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
3649 }
3651 // Usually we'll find _Event == 0 at this point, but as
3652 // an optional optimization we clear it, just in case can
3653 // multiple unpark() operations drove _Event up to 1.
3654 _Event = 0 ;
3655 OrderAccess::fence() ;
3656 guarantee (_Event >= 0, "invariant") ;
3657 }
3659 void os::PlatformEvent::unpark() {
3660 guarantee (_ParkHandle != NULL, "Invariant") ;
3661 int v ;
3662 for (;;) {
3663 v = _Event ; // Increment _Event if it's < 1.
3664 if (v > 0) {
3665 // If it's already signaled just return.
3666 // The LD of _Event could have reordered or be satisfied
3667 // by a read-aside from this processor's write buffer.
3668 // To avoid problems execute a barrier and then
3669 // ratify the value. A degenerate CAS() would also work.
3670 // Viz., CAS (v+0, &_Event, v) == v).
3671 OrderAccess::fence() ;
3672 if (_Event == v) return ;
3673 continue ;
3674 }
3675 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
3676 }
3677 if (v < 0) {
3678 ::SetEvent (_ParkHandle) ;
3679 }
3680 }
3683 // JSR166
3684 // -------------------------------------------------------
3686 /*
3687 * The Windows implementation of Park is very straightforward: Basic
3688 * operations on Win32 Events turn out to have the right semantics to
3689 * use them directly. We opportunistically resuse the event inherited
3690 * from Monitor.
3691 */
3694 void Parker::park(bool isAbsolute, jlong time) {
3695 guarantee (_ParkEvent != NULL, "invariant") ;
3696 // First, demultiplex/decode time arguments
3697 if (time < 0) { // don't wait
3698 return;
3699 }
3700 else if (time == 0) {
3701 time = INFINITE;
3702 }
3703 else if (isAbsolute) {
3704 time -= os::javaTimeMillis(); // convert to relative time
3705 if (time <= 0) // already elapsed
3706 return;
3707 }
3708 else { // relative
3709 time /= 1000000; // Must coarsen from nanos to millis
3710 if (time == 0) // Wait for the minimal time unit if zero
3711 time = 1;
3712 }
3714 JavaThread* thread = (JavaThread*)(Thread::current());
3715 assert(thread->is_Java_thread(), "Must be JavaThread");
3716 JavaThread *jt = (JavaThread *)thread;
3718 // Don't wait if interrupted or already triggered
3719 if (Thread::is_interrupted(thread, false) ||
3720 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
3721 ResetEvent(_ParkEvent);
3722 return;
3723 }
3724 else {
3725 ThreadBlockInVM tbivm(jt);
3726 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3727 jt->set_suspend_equivalent();
3729 WaitForSingleObject(_ParkEvent, time);
3730 ResetEvent(_ParkEvent);
3732 // If externally suspended while waiting, re-suspend
3733 if (jt->handle_special_suspend_equivalent_condition()) {
3734 jt->java_suspend_self();
3735 }
3736 }
3737 }
3739 void Parker::unpark() {
3740 guarantee (_ParkEvent != NULL, "invariant") ;
3741 SetEvent(_ParkEvent);
3742 }
3744 // Run the specified command in a separate process. Return its exit value,
3745 // or -1 on failure (e.g. can't create a new process).
3746 int os::fork_and_exec(char* cmd) {
3747 STARTUPINFO si;
3748 PROCESS_INFORMATION pi;
3750 memset(&si, 0, sizeof(si));
3751 si.cb = sizeof(si);
3752 memset(&pi, 0, sizeof(pi));
3753 BOOL rslt = CreateProcess(NULL, // executable name - use command line
3754 cmd, // command line
3755 NULL, // process security attribute
3756 NULL, // thread security attribute
3757 TRUE, // inherits system handles
3758 0, // no creation flags
3759 NULL, // use parent's environment block
3760 NULL, // use parent's starting directory
3761 &si, // (in) startup information
3762 &pi); // (out) process information
3764 if (rslt) {
3765 // Wait until child process exits.
3766 WaitForSingleObject(pi.hProcess, INFINITE);
3768 DWORD exit_code;
3769 GetExitCodeProcess(pi.hProcess, &exit_code);
3771 // Close process and thread handles.
3772 CloseHandle(pi.hProcess);
3773 CloseHandle(pi.hThread);
3775 return (int)exit_code;
3776 } else {
3777 return -1;
3778 }
3779 }
3781 //--------------------------------------------------------------------------------------------------
3782 // Non-product code
3784 static int mallocDebugIntervalCounter = 0;
3785 static int mallocDebugCounter = 0;
3786 bool os::check_heap(bool force) {
3787 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
3788 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
3789 // Note: HeapValidate executes two hardware breakpoints when it finds something
3790 // wrong; at these points, eax contains the address of the offending block (I think).
3791 // To get to the exlicit error message(s) below, just continue twice.
3792 HANDLE heap = GetProcessHeap();
3793 { HeapLock(heap);
3794 PROCESS_HEAP_ENTRY phe;
3795 phe.lpData = NULL;
3796 while (HeapWalk(heap, &phe) != 0) {
3797 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
3798 !HeapValidate(heap, 0, phe.lpData)) {
3799 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
3800 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
3801 fatal("corrupted C heap");
3802 }
3803 }
3804 int err = GetLastError();
3805 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
3806 fatal1("heap walk aborted with error %d", err);
3807 }
3808 HeapUnlock(heap);
3809 }
3810 mallocDebugIntervalCounter = 0;
3811 }
3812 return true;
3813 }
3816 #ifndef PRODUCT
3817 bool os::find(address addr) {
3818 // Nothing yet
3819 return false;
3820 }
3821 #endif
3823 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
3824 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
3826 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
3827 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
3828 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
3829 address addr = (address) exceptionRecord->ExceptionInformation[1];
3831 if (os::is_memory_serialize_page(thread, addr))
3832 return EXCEPTION_CONTINUE_EXECUTION;
3833 }
3835 return EXCEPTION_CONTINUE_SEARCH;
3836 }
3838 static int getLastErrorString(char *buf, size_t len)
3839 {
3840 long errval;
3842 if ((errval = GetLastError()) != 0)
3843 {
3844 /* DOS error */
3845 size_t n = (size_t)FormatMessage(
3846 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
3847 NULL,
3848 errval,
3849 0,
3850 buf,
3851 (DWORD)len,
3852 NULL);
3853 if (n > 3) {
3854 /* Drop final '.', CR, LF */
3855 if (buf[n - 1] == '\n') n--;
3856 if (buf[n - 1] == '\r') n--;
3857 if (buf[n - 1] == '.') n--;
3858 buf[n] = '\0';
3859 }
3860 return (int)n;
3861 }
3863 if (errno != 0)
3864 {
3865 /* C runtime error that has no corresponding DOS error code */
3866 const char *s = strerror(errno);
3867 size_t n = strlen(s);
3868 if (n >= len) n = len - 1;
3869 strncpy(buf, s, n);
3870 buf[n] = '\0';
3871 return (int)n;
3872 }
3873 return 0;
3874 }