1 /*
2 * Copyright 1997-2010 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 */
24
25 #ifdef _WIN64
26 // Must be at least Windows 2000 or XP to use VectoredExceptions
27 #define _WIN32_WINNT 0x500
28 #endif
29
30 // do not include precompiled header file
31 # include "incls/_os_windows.cpp.incl"
32
33 #ifdef _DEBUG
34 #include <crtdbg.h>
35 #endif
36
37
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>
44
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
53
54 /* for enumerating dll libraries */
55 #include <tlhelp32.h>
56 #include <vdmdbg.h>
57
58 // for timer info max values which include all bits
59 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
60
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
65
66 static HANDLE main_process;
67 static HANDLE main_thread;
68 static int main_thread_id;
69
70 static FILETIME process_creation_time;
71 static FILETIME process_exit_time;
72 static FILETIME process_user_time;
73 static FILETIME process_kernel_time;
74
75 #ifdef _WIN64
76 PVOID topLevelVectoredExceptionHandler = NULL;
77 #endif
78
79 #ifdef _M_IA64
80 #define __CPU__ ia64
81 #elif _M_AMD64
82 #define __CPU__ amd64
83 #else
84 #define __CPU__ i486
85 #endif
86
87 // save DLL module handle, used by GetModuleFileName
88
89 HINSTANCE vm_lib_handle;
90 static int getLastErrorString(char *buf, size_t len);
91
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 }
114
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 }
122
123 // Implementation of os
124
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 }
129
130
131 // No setuid programs under Windows.
132 bool os::have_special_privileges() {
133 return false;
134 }
135
136
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 }
143
144 #ifndef _WIN64
145 // previous UnhandledExceptionFilter, if there is one
146 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
147
148 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
149 #endif
150 void os::init_system_properties_values() {
151 /* sysclasspath, java_home, dll_dir */
152 {
153 char *home_path;
154 char *dll_path;
155 char *pslash;
156 char *bin = "\\bin";
157 char home_dir[MAX_PATH];
158
159 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
160 os::jvm_path(home_dir, sizeof(home_dir));
161 // Found the full path to jvm[_g].dll.
162 // Now cut the path to <java_home>/jre if we can.
163 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
164 pslash = strrchr(home_dir, '\\');
165 if (pslash != NULL) {
166 *pslash = '\0'; /* get rid of \{client|server} */
167 pslash = strrchr(home_dir, '\\');
168 if (pslash != NULL)
169 *pslash = '\0'; /* get rid of \bin */
170 }
171 }
172
173 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1);
174 if (home_path == NULL)
175 return;
176 strcpy(home_path, home_dir);
177 Arguments::set_java_home(home_path);
178
179 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1);
180 if (dll_path == NULL)
181 return;
182 strcpy(dll_path, home_dir);
183 strcat(dll_path, bin);
184 Arguments::set_dll_dir(dll_path);
185
186 if (!set_boot_path('\\', ';'))
187 return;
188 }
189
190 /* library_path */
191 #define EXT_DIR "\\lib\\ext"
192 #define BIN_DIR "\\bin"
193 #define PACKAGE_DIR "\\Sun\\Java"
194 {
195 /* Win32 library search order (See the documentation for LoadLibrary):
196 *
197 * 1. The directory from which application is loaded.
198 * 2. The current directory
199 * 3. The system wide Java Extensions directory (Java only)
200 * 4. System directory (GetSystemDirectory)
201 * 5. Windows directory (GetWindowsDirectory)
202 * 6. The PATH environment variable
203 */
204
205 char *library_path;
206 char tmp[MAX_PATH];
207 char *path_str = ::getenv("PATH");
208
209 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
210 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10);
211
212 library_path[0] = '\0';
213
214 GetModuleFileName(NULL, tmp, sizeof(tmp));
215 *(strrchr(tmp, '\\')) = '\0';
216 strcat(library_path, tmp);
217
218 strcat(library_path, ";.");
219
220 GetWindowsDirectory(tmp, sizeof(tmp));
221 strcat(library_path, ";");
222 strcat(library_path, tmp);
223 strcat(library_path, PACKAGE_DIR BIN_DIR);
224
225 GetSystemDirectory(tmp, sizeof(tmp));
226 strcat(library_path, ";");
227 strcat(library_path, tmp);
228
229 GetWindowsDirectory(tmp, sizeof(tmp));
230 strcat(library_path, ";");
231 strcat(library_path, tmp);
232
233 if (path_str) {
234 strcat(library_path, ";");
235 strcat(library_path, path_str);
236 }
237
238 Arguments::set_library_path(library_path);
239 FREE_C_HEAP_ARRAY(char, library_path);
240 }
241
242 /* Default extensions directory */
243 {
244 char path[MAX_PATH];
245 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
246 GetWindowsDirectory(path, MAX_PATH);
247 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
248 path, PACKAGE_DIR, EXT_DIR);
249 Arguments::set_ext_dirs(buf);
250 }
251 #undef EXT_DIR
252 #undef BIN_DIR
253 #undef PACKAGE_DIR
254
255 /* Default endorsed standards directory. */
256 {
257 #define ENDORSED_DIR "\\lib\\endorsed"
258 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
259 char * buf = NEW_C_HEAP_ARRAY(char, len);
260 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
261 Arguments::set_endorsed_dirs(buf);
262 #undef ENDORSED_DIR
263 }
264
265 #ifndef _WIN64
266 // set our UnhandledExceptionFilter and save any previous one
267 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
268 #endif
269
270 // Done
271 return;
272 }
273
274 void os::breakpoint() {
275 DebugBreak();
276 }
277
278 // Invoked from the BREAKPOINT Macro
279 extern "C" void breakpoint() {
280 os::breakpoint();
281 }
282
283 // Returns an estimate of the current stack pointer. Result must be guaranteed
284 // to point into the calling threads stack, and be no lower than the current
285 // stack pointer.
286
287 address os::current_stack_pointer() {
288 int dummy;
289 address sp = (address)&dummy;
290 return sp;
291 }
292
293 // os::current_stack_base()
294 //
295 // Returns the base of the stack, which is the stack's
296 // starting address. This function must be called
297 // while running on the stack of the thread being queried.
298
299 address os::current_stack_base() {
300 MEMORY_BASIC_INFORMATION minfo;
301 address stack_bottom;
302 size_t stack_size;
303
304 VirtualQuery(&minfo, &minfo, sizeof(minfo));
305 stack_bottom = (address)minfo.AllocationBase;
306 stack_size = minfo.RegionSize;
307
308 // Add up the sizes of all the regions with the same
309 // AllocationBase.
310 while( 1 )
311 {
312 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
313 if ( stack_bottom == (address)minfo.AllocationBase )
314 stack_size += minfo.RegionSize;
315 else
316 break;
317 }
318
319 #ifdef _M_IA64
320 // IA64 has memory and register stacks
321 stack_size = stack_size / 2;
322 #endif
323 return stack_bottom + stack_size;
324 }
325
326 size_t os::current_stack_size() {
327 size_t sz;
328 MEMORY_BASIC_INFORMATION minfo;
329 VirtualQuery(&minfo, &minfo, sizeof(minfo));
330 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
331 return sz;
332 }
333
334 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
335 const struct tm* time_struct_ptr = localtime(clock);
336 if (time_struct_ptr != NULL) {
337 *res = *time_struct_ptr;
338 return res;
339 }
340 return NULL;
341 }
342
343 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
344
345 // Thread start routine for all new Java threads
346 static unsigned __stdcall java_start(Thread* thread) {
347 // Try to randomize the cache line index of hot stack frames.
348 // This helps when threads of the same stack traces evict each other's
349 // cache lines. The threads can be either from the same JVM instance, or
350 // from different JVM instances. The benefit is especially true for
351 // processors with hyperthreading technology.
352 static int counter = 0;
353 int pid = os::current_process_id();
354 _alloca(((pid ^ counter++) & 7) * 128);
355
356 OSThread* osthr = thread->osthread();
357 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
358
359 if (UseNUMA) {
360 int lgrp_id = os::numa_get_group_id();
361 if (lgrp_id != -1) {
362 thread->set_lgrp_id(lgrp_id);
363 }
364 }
365
366
367 if (UseVectoredExceptions) {
368 // If we are using vectored exception we don't need to set a SEH
369 thread->run();
370 }
371 else {
372 // Install a win32 structured exception handler around every thread created
373 // by VM, so VM can genrate error dump when an exception occurred in non-
374 // Java thread (e.g. VM thread).
375 __try {
376 thread->run();
377 } __except(topLevelExceptionFilter(
378 (_EXCEPTION_POINTERS*)_exception_info())) {
379 // Nothing to do.
380 }
381 }
382
383 // One less thread is executing
384 // When the VMThread gets here, the main thread may have already exited
385 // which frees the CodeHeap containing the Atomic::add code
386 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
387 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
388 }
389
390 return 0;
391 }
392
393 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
394 // Allocate the OSThread object
395 OSThread* osthread = new OSThread(NULL, NULL);
396 if (osthread == NULL) return NULL;
397
398 // Initialize support for Java interrupts
399 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
400 if (interrupt_event == NULL) {
401 delete osthread;
402 return NULL;
403 }
404 osthread->set_interrupt_event(interrupt_event);
405
406 // Store info on the Win32 thread into the OSThread
407 osthread->set_thread_handle(thread_handle);
408 osthread->set_thread_id(thread_id);
409
410 if (UseNUMA) {
411 int lgrp_id = os::numa_get_group_id();
412 if (lgrp_id != -1) {
413 thread->set_lgrp_id(lgrp_id);
414 }
415 }
416
417 // Initial thread state is INITIALIZED, not SUSPENDED
418 osthread->set_state(INITIALIZED);
419
420 return osthread;
421 }
422
423
424 bool os::create_attached_thread(JavaThread* thread) {
425 #ifdef ASSERT
426 thread->verify_not_published();
427 #endif
428 HANDLE thread_h;
429 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
430 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
431 fatal("DuplicateHandle failed\n");
432 }
433 OSThread* osthread = create_os_thread(thread, thread_h,
434 (int)current_thread_id());
435 if (osthread == NULL) {
436 return false;
437 }
438
439 // Initial thread state is RUNNABLE
440 osthread->set_state(RUNNABLE);
441
442 thread->set_osthread(osthread);
443 return true;
444 }
445
446 bool os::create_main_thread(JavaThread* thread) {
447 #ifdef ASSERT
448 thread->verify_not_published();
449 #endif
450 if (_starting_thread == NULL) {
451 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
452 if (_starting_thread == NULL) {
453 return false;
454 }
455 }
456
457 // The primordial thread is runnable from the start)
458 _starting_thread->set_state(RUNNABLE);
459
460 thread->set_osthread(_starting_thread);
461 return true;
462 }
463
464 // Allocate and initialize a new OSThread
465 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
466 unsigned thread_id;
467
468 // Allocate the OSThread object
469 OSThread* osthread = new OSThread(NULL, NULL);
470 if (osthread == NULL) {
471 return false;
472 }
473
474 // Initialize support for Java interrupts
475 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
476 if (interrupt_event == NULL) {
477 delete osthread;
478 return NULL;
479 }
480 osthread->set_interrupt_event(interrupt_event);
481 osthread->set_interrupted(false);
482
483 thread->set_osthread(osthread);
484
485 if (stack_size == 0) {
486 switch (thr_type) {
487 case os::java_thread:
488 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
489 if (JavaThread::stack_size_at_create() > 0)
490 stack_size = JavaThread::stack_size_at_create();
491 break;
492 case os::compiler_thread:
493 if (CompilerThreadStackSize > 0) {
494 stack_size = (size_t)(CompilerThreadStackSize * K);
495 break;
496 } // else fall through:
497 // use VMThreadStackSize if CompilerThreadStackSize is not defined
498 case os::vm_thread:
499 case os::pgc_thread:
500 case os::cgc_thread:
501 case os::watcher_thread:
502 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
503 break;
504 }
505 }
506
507 // Create the Win32 thread
508 //
509 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
510 // does not specify stack size. Instead, it specifies the size of
511 // initially committed space. The stack size is determined by
512 // PE header in the executable. If the committed "stack_size" is larger
513 // than default value in the PE header, the stack is rounded up to the
514 // nearest multiple of 1MB. For example if the launcher has default
515 // stack size of 320k, specifying any size less than 320k does not
516 // affect the actual stack size at all, it only affects the initial
517 // commitment. On the other hand, specifying 'stack_size' larger than
518 // default value may cause significant increase in memory usage, because
519 // not only the stack space will be rounded up to MB, but also the
520 // entire space is committed upfront.
521 //
522 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
523 // for CreateThread() that can treat 'stack_size' as stack size. However we
524 // are not supposed to call CreateThread() directly according to MSDN
525 // document because JVM uses C runtime library. The good news is that the
526 // flag appears to work with _beginthredex() as well.
527
528 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
529 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
530 #endif
531
532 HANDLE thread_handle =
533 (HANDLE)_beginthreadex(NULL,
534 (unsigned)stack_size,
535 (unsigned (__stdcall *)(void*)) java_start,
536 thread,
537 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
538 &thread_id);
539 if (thread_handle == NULL) {
540 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
541 // without the flag.
542 thread_handle =
543 (HANDLE)_beginthreadex(NULL,
544 (unsigned)stack_size,
545 (unsigned (__stdcall *)(void*)) java_start,
546 thread,
547 CREATE_SUSPENDED,
548 &thread_id);
549 }
550 if (thread_handle == NULL) {
551 // Need to clean up stuff we've allocated so far
552 CloseHandle(osthread->interrupt_event());
553 thread->set_osthread(NULL);
554 delete osthread;
555 return NULL;
556 }
557
558 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
559
560 // Store info on the Win32 thread into the OSThread
561 osthread->set_thread_handle(thread_handle);
562 osthread->set_thread_id(thread_id);
563
564 // Initial thread state is INITIALIZED, not SUSPENDED
565 osthread->set_state(INITIALIZED);
566
567 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
568 return true;
569 }
570
571
572 // Free Win32 resources related to the OSThread
573 void os::free_thread(OSThread* osthread) {
574 assert(osthread != NULL, "osthread not set");
575 CloseHandle(osthread->thread_handle());
576 CloseHandle(osthread->interrupt_event());
577 delete osthread;
578 }
579
580
581 static int has_performance_count = 0;
582 static jlong first_filetime;
583 static jlong initial_performance_count;
584 static jlong performance_frequency;
585
586
587 jlong as_long(LARGE_INTEGER x) {
588 jlong result = 0; // initialization to avoid warning
589 set_high(&result, x.HighPart);
590 set_low(&result, x.LowPart);
591 return result;
592 }
593
594
595 jlong os::elapsed_counter() {
596 LARGE_INTEGER count;
597 if (has_performance_count) {
598 QueryPerformanceCounter(&count);
599 return as_long(count) - initial_performance_count;
600 } else {
601 FILETIME wt;
602 GetSystemTimeAsFileTime(&wt);
603 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
604 }
605 }
606
607
608 jlong os::elapsed_frequency() {
609 if (has_performance_count) {
610 return performance_frequency;
611 } else {
612 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
613 return 10000000;
614 }
615 }
616
617
618 julong os::available_memory() {
619 return win32::available_memory();
620 }
621
622 julong os::win32::available_memory() {
623 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
624 // value if total memory is larger than 4GB
625 MEMORYSTATUSEX ms;
626 ms.dwLength = sizeof(ms);
627 GlobalMemoryStatusEx(&ms);
628
629 return (julong)ms.ullAvailPhys;
630 }
631
632 julong os::physical_memory() {
633 return win32::physical_memory();
634 }
635
636 julong os::allocatable_physical_memory(julong size) {
637 #ifdef _LP64
638 return size;
639 #else
640 // Limit to 1400m because of the 2gb address space wall
641 return MIN2(size, (julong)1400*M);
642 #endif
643 }
644
645 // VC6 lacks DWORD_PTR
646 #if _MSC_VER < 1300
647 typedef UINT_PTR DWORD_PTR;
648 #endif
649
650 int os::active_processor_count() {
651 DWORD_PTR lpProcessAffinityMask = 0;
652 DWORD_PTR lpSystemAffinityMask = 0;
653 int proc_count = processor_count();
654 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
655 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
656 // Nof active processors is number of bits in process affinity mask
657 int bitcount = 0;
658 while (lpProcessAffinityMask != 0) {
659 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
660 bitcount++;
661 }
662 return bitcount;
663 } else {
664 return proc_count;
665 }
666 }
667
668 bool os::distribute_processes(uint length, uint* distribution) {
669 // Not yet implemented.
670 return false;
671 }
672
673 bool os::bind_to_processor(uint processor_id) {
674 // Not yet implemented.
675 return false;
676 }
677
678 static void initialize_performance_counter() {
679 LARGE_INTEGER count;
680 if (QueryPerformanceFrequency(&count)) {
681 has_performance_count = 1;
682 performance_frequency = as_long(count);
683 QueryPerformanceCounter(&count);
684 initial_performance_count = as_long(count);
685 } else {
686 has_performance_count = 0;
687 FILETIME wt;
688 GetSystemTimeAsFileTime(&wt);
689 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
690 }
691 }
692
693
694 double os::elapsedTime() {
695 return (double) elapsed_counter() / (double) elapsed_frequency();
696 }
697
698
699 // Windows format:
700 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
701 // Java format:
702 // Java standards require the number of milliseconds since 1/1/1970
703
704 // Constant offset - calculated using offset()
705 static jlong _offset = 116444736000000000;
706 // Fake time counter for reproducible results when debugging
707 static jlong fake_time = 0;
708
709 #ifdef ASSERT
710 // Just to be safe, recalculate the offset in debug mode
711 static jlong _calculated_offset = 0;
712 static int _has_calculated_offset = 0;
713
714 jlong offset() {
715 if (_has_calculated_offset) return _calculated_offset;
716 SYSTEMTIME java_origin;
717 java_origin.wYear = 1970;
718 java_origin.wMonth = 1;
719 java_origin.wDayOfWeek = 0; // ignored
720 java_origin.wDay = 1;
721 java_origin.wHour = 0;
722 java_origin.wMinute = 0;
723 java_origin.wSecond = 0;
724 java_origin.wMilliseconds = 0;
725 FILETIME jot;
726 if (!SystemTimeToFileTime(&java_origin, &jot)) {
727 fatal1("Error = %d\nWindows error", GetLastError());
728 }
729 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
730 _has_calculated_offset = 1;
731 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
732 return _calculated_offset;
733 }
734 #else
735 jlong offset() {
736 return _offset;
737 }
738 #endif
739
740 jlong windows_to_java_time(FILETIME wt) {
741 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
742 return (a - offset()) / 10000;
743 }
744
745 FILETIME java_to_windows_time(jlong l) {
746 jlong a = (l * 10000) + offset();
747 FILETIME result;
748 result.dwHighDateTime = high(a);
749 result.dwLowDateTime = low(a);
750 return result;
751 }
752
753 // For now, we say that Windows does not support vtime. I have no idea
754 // whether it can actually be made to (DLD, 9/13/05).
755
756 bool os::supports_vtime() { return false; }
757 bool os::enable_vtime() { return false; }
758 bool os::vtime_enabled() { return false; }
759 double os::elapsedVTime() {
760 // better than nothing, but not much
761 return elapsedTime();
762 }
763
764 jlong os::javaTimeMillis() {
765 if (UseFakeTimers) {
766 return fake_time++;
767 } else {
768 FILETIME wt;
769 GetSystemTimeAsFileTime(&wt);
770 return windows_to_java_time(wt);
771 }
772 }
773
774 #define NANOS_PER_SEC CONST64(1000000000)
775 #define NANOS_PER_MILLISEC 1000000
776 jlong os::javaTimeNanos() {
777 if (!has_performance_count) {
778 return javaTimeMillis() * NANOS_PER_MILLISEC; // the best we can do.
779 } else {
780 LARGE_INTEGER current_count;
781 QueryPerformanceCounter(¤t_count);
782 double current = as_long(current_count);
783 double freq = performance_frequency;
784 jlong time = (jlong)((current/freq) * NANOS_PER_SEC);
785 return time;
786 }
787 }
788
789 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
790 if (!has_performance_count) {
791 // javaTimeMillis() doesn't have much percision,
792 // but it is not going to wrap -- so all 64 bits
793 info_ptr->max_value = ALL_64_BITS;
794
795 // this is a wall clock timer, so may skip
796 info_ptr->may_skip_backward = true;
797 info_ptr->may_skip_forward = true;
798 } else {
799 jlong freq = performance_frequency;
800 if (freq < NANOS_PER_SEC) {
801 // the performance counter is 64 bits and we will
802 // be multiplying it -- so no wrap in 64 bits
803 info_ptr->max_value = ALL_64_BITS;
804 } else if (freq > NANOS_PER_SEC) {
805 // use the max value the counter can reach to
806 // determine the max value which could be returned
807 julong max_counter = (julong)ALL_64_BITS;
808 info_ptr->max_value = (jlong)(max_counter / (freq / NANOS_PER_SEC));
809 } else {
810 // the performance counter is 64 bits and we will
811 // be using it directly -- so no wrap in 64 bits
812 info_ptr->max_value = ALL_64_BITS;
813 }
814
815 // using a counter, so no skipping
816 info_ptr->may_skip_backward = false;
817 info_ptr->may_skip_forward = false;
818 }
819 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
820 }
821
822 char* os::local_time_string(char *buf, size_t buflen) {
823 SYSTEMTIME st;
824 GetLocalTime(&st);
825 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
826 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
827 return buf;
828 }
829
830 bool os::getTimesSecs(double* process_real_time,
831 double* process_user_time,
832 double* process_system_time) {
833 HANDLE h_process = GetCurrentProcess();
834 FILETIME create_time, exit_time, kernel_time, user_time;
835 BOOL result = GetProcessTimes(h_process,
836 &create_time,
837 &exit_time,
838 &kernel_time,
839 &user_time);
840 if (result != 0) {
841 FILETIME wt;
842 GetSystemTimeAsFileTime(&wt);
843 jlong rtc_millis = windows_to_java_time(wt);
844 jlong user_millis = windows_to_java_time(user_time);
845 jlong system_millis = windows_to_java_time(kernel_time);
846 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
847 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
848 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
849 return true;
850 } else {
851 return false;
852 }
853 }
854
855 void os::shutdown() {
856
857 // allow PerfMemory to attempt cleanup of any persistent resources
858 perfMemory_exit();
859
860 // flush buffered output, finish log files
861 ostream_abort();
862
863 // Check for abort hook
864 abort_hook_t abort_hook = Arguments::abort_hook();
865 if (abort_hook != NULL) {
866 abort_hook();
867 }
868 }
869
870 void os::abort(bool dump_core)
871 {
872 os::shutdown();
873 // no core dump on Windows
874 ::exit(1);
875 }
876
877 // Die immediately, no exit hook, no abort hook, no cleanup.
878 void os::die() {
879 _exit(-1);
880 }
881
882 // Directory routines copied from src/win32/native/java/io/dirent_md.c
883 // * dirent_md.c 1.15 00/02/02
884 //
885 // The declarations for DIR and struct dirent are in jvm_win32.h.
886
887 /* Caller must have already run dirname through JVM_NativePath, which removes
888 duplicate slashes and converts all instances of '/' into '\\'. */
889
890 DIR *
891 os::opendir(const char *dirname)
892 {
893 assert(dirname != NULL, "just checking"); // hotspot change
894 DIR *dirp = (DIR *)malloc(sizeof(DIR));
895 DWORD fattr; // hotspot change
896 char alt_dirname[4] = { 0, 0, 0, 0 };
897
898 if (dirp == 0) {
899 errno = ENOMEM;
900 return 0;
901 }
902
903 /*
904 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
905 * as a directory in FindFirstFile(). We detect this case here and
906 * prepend the current drive name.
907 */
908 if (dirname[1] == '\0' && dirname[0] == '\\') {
909 alt_dirname[0] = _getdrive() + 'A' - 1;
910 alt_dirname[1] = ':';
911 alt_dirname[2] = '\\';
912 alt_dirname[3] = '\0';
913 dirname = alt_dirname;
914 }
915
916 dirp->path = (char *)malloc(strlen(dirname) + 5);
917 if (dirp->path == 0) {
918 free(dirp);
919 errno = ENOMEM;
920 return 0;
921 }
922 strcpy(dirp->path, dirname);
923
924 fattr = GetFileAttributes(dirp->path);
925 if (fattr == 0xffffffff) {
926 free(dirp->path);
927 free(dirp);
928 errno = ENOENT;
929 return 0;
930 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
931 free(dirp->path);
932 free(dirp);
933 errno = ENOTDIR;
934 return 0;
935 }
936
937 /* Append "*.*", or possibly "\\*.*", to path */
938 if (dirp->path[1] == ':'
939 && (dirp->path[2] == '\0'
940 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
941 /* No '\\' needed for cases like "Z:" or "Z:\" */
942 strcat(dirp->path, "*.*");
943 } else {
944 strcat(dirp->path, "\\*.*");
945 }
946
947 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
948 if (dirp->handle == INVALID_HANDLE_VALUE) {
949 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
950 free(dirp->path);
951 free(dirp);
952 errno = EACCES;
953 return 0;
954 }
955 }
956 return dirp;
957 }
958
959 /* parameter dbuf unused on Windows */
960
961 struct dirent *
962 os::readdir(DIR *dirp, dirent *dbuf)
963 {
964 assert(dirp != NULL, "just checking"); // hotspot change
965 if (dirp->handle == INVALID_HANDLE_VALUE) {
966 return 0;
967 }
968
969 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
970
971 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
972 if (GetLastError() == ERROR_INVALID_HANDLE) {
973 errno = EBADF;
974 return 0;
975 }
976 FindClose(dirp->handle);
977 dirp->handle = INVALID_HANDLE_VALUE;
978 }
979
980 return &dirp->dirent;
981 }
982
983 int
984 os::closedir(DIR *dirp)
985 {
986 assert(dirp != NULL, "just checking"); // hotspot change
987 if (dirp->handle != INVALID_HANDLE_VALUE) {
988 if (!FindClose(dirp->handle)) {
989 errno = EBADF;
990 return -1;
991 }
992 dirp->handle = INVALID_HANDLE_VALUE;
993 }
994 free(dirp->path);
995 free(dirp);
996 return 0;
997 }
998
999 const char* os::dll_file_extension() { return ".dll"; }
1000
1001 const char * os::get_temp_directory()
1002 {
1003 static char path_buf[MAX_PATH];
1004 if (GetTempPath(MAX_PATH, path_buf)>0)
1005 return path_buf;
1006 else{
1007 path_buf[0]='\0';
1008 return path_buf;
1009 }
1010 }
1011
1012 static bool file_exists(const char* filename) {
1013 if (filename == NULL || strlen(filename) == 0) {
1014 return false;
1015 }
1016 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1017 }
1018
1019 void os::dll_build_name(char *buffer, size_t buflen,
1020 const char* pname, const char* fname) {
1021 // Copied from libhpi
1022 const size_t pnamelen = pname ? strlen(pname) : 0;
1023 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1024
1025 // Quietly truncates on buffer overflow. Should be an error.
1026 if (pnamelen + strlen(fname) + 10 > buflen) {
1027 *buffer = '\0';
1028 return;
1029 }
1030
1031 if (pnamelen == 0) {
1032 jio_snprintf(buffer, buflen, "%s.dll", fname);
1033 } else if (c == ':' || c == '\\') {
1034 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1035 } else if (strchr(pname, *os::path_separator()) != NULL) {
1036 int n;
1037 char** pelements = split_path(pname, &n);
1038 for (int i = 0 ; i < n ; i++) {
1039 char* path = pelements[i];
1040 // Really shouldn't be NULL, but check can't hurt
1041 size_t plen = (path == NULL) ? 0 : strlen(path);
1042 if (plen == 0) {
1043 continue; // skip the empty path values
1044 }
1045 const char lastchar = path[plen - 1];
1046 if (lastchar == ':' || lastchar == '\\') {
1047 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1048 } else {
1049 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1050 }
1051 if (file_exists(buffer)) {
1052 break;
1053 }
1054 }
1055 // release the storage
1056 for (int i = 0 ; i < n ; i++) {
1057 if (pelements[i] != NULL) {
1058 FREE_C_HEAP_ARRAY(char, pelements[i]);
1059 }
1060 }
1061 if (pelements != NULL) {
1062 FREE_C_HEAP_ARRAY(char*, pelements);
1063 }
1064 } else {
1065 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1066 }
1067 }
1068
1069 // Needs to be in os specific directory because windows requires another
1070 // header file <direct.h>
1071 const char* os::get_current_directory(char *buf, int buflen) {
1072 return _getcwd(buf, buflen);
1073 }
1074
1075 //-----------------------------------------------------------
1076 // Helper functions for fatal error handler
1077
1078 // The following library functions are resolved dynamically at runtime:
1079
1080 // PSAPI functions, for Windows NT, 2000, XP
1081
1082 // psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform
1083 // SDK from Microsoft. Here are the definitions copied from psapi.h
1084 typedef struct _MODULEINFO {
1085 LPVOID lpBaseOfDll;
1086 DWORD SizeOfImage;
1087 LPVOID EntryPoint;
1088 } MODULEINFO, *LPMODULEINFO;
1089
1090 static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD );
1091 static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD );
1092 static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD );
1093
1094 // ToolHelp Functions, for Windows 95, 98 and ME
1095
1096 static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ;
1097 static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ;
1098 static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ;
1099
1100 bool _has_psapi;
1101 bool _psapi_init = false;
1102 bool _has_toolhelp;
1103
1104 static bool _init_psapi() {
1105 HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ;
1106 if( psapi == NULL ) return false ;
1107
1108 _EnumProcessModules = CAST_TO_FN_PTR(
1109 BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD),
1110 GetProcAddress(psapi, "EnumProcessModules")) ;
1111 _GetModuleFileNameEx = CAST_TO_FN_PTR(
1112 DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD),
1113 GetProcAddress(psapi, "GetModuleFileNameExA"));
1114 _GetModuleInformation = CAST_TO_FN_PTR(
1115 BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD),
1116 GetProcAddress(psapi, "GetModuleInformation"));
1117
1118 _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation);
1119 _psapi_init = true;
1120 return _has_psapi;
1121 }
1122
1123 static bool _init_toolhelp() {
1124 HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ;
1125 if (kernel32 == NULL) return false ;
1126
1127 _CreateToolhelp32Snapshot = CAST_TO_FN_PTR(
1128 HANDLE(WINAPI *)(DWORD,DWORD),
1129 GetProcAddress(kernel32, "CreateToolhelp32Snapshot"));
1130 _Module32First = CAST_TO_FN_PTR(
1131 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1132 GetProcAddress(kernel32, "Module32First" ));
1133 _Module32Next = CAST_TO_FN_PTR(
1134 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1135 GetProcAddress(kernel32, "Module32Next" ));
1136
1137 _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next);
1138 return _has_toolhelp;
1139 }
1140
1141 #ifdef _WIN64
1142 // Helper routine which returns true if address in
1143 // within the NTDLL address space.
1144 //
1145 static bool _addr_in_ntdll( address addr )
1146 {
1147 HMODULE hmod;
1148 MODULEINFO minfo;
1149
1150 hmod = GetModuleHandle("NTDLL.DLL");
1151 if ( hmod == NULL ) return false;
1152 if ( !_GetModuleInformation( GetCurrentProcess(), hmod,
1153 &minfo, sizeof(MODULEINFO)) )
1154 return false;
1155
1156 if ( (addr >= minfo.lpBaseOfDll) &&
1157 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1158 return true;
1159 else
1160 return false;
1161 }
1162 #endif
1163
1164
1165 // Enumerate all modules for a given process ID
1166 //
1167 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1168 // different API for doing this. We use PSAPI.DLL on NT based
1169 // Windows and ToolHelp on 95/98/Me.
1170
1171 // Callback function that is called by enumerate_modules() on
1172 // every DLL module.
1173 // Input parameters:
1174 // int pid,
1175 // char* module_file_name,
1176 // address module_base_addr,
1177 // unsigned module_size,
1178 // void* param
1179 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1180
1181 // enumerate_modules for Windows NT, using PSAPI
1182 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1183 {
1184 HANDLE hProcess ;
1185
1186 # define MAX_NUM_MODULES 128
1187 HMODULE modules[MAX_NUM_MODULES];
1188 static char filename[ MAX_PATH ];
1189 int result = 0;
1190
1191 if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0;
1192
1193 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1194 FALSE, pid ) ;
1195 if (hProcess == NULL) return 0;
1196
1197 DWORD size_needed;
1198 if (!_EnumProcessModules(hProcess, modules,
1199 sizeof(modules), &size_needed)) {
1200 CloseHandle( hProcess );
1201 return 0;
1202 }
1203
1204 // number of modules that are currently loaded
1205 int num_modules = size_needed / sizeof(HMODULE);
1206
1207 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1208 // Get Full pathname:
1209 if(!_GetModuleFileNameEx(hProcess, modules[i],
1210 filename, sizeof(filename))) {
1211 filename[0] = '\0';
1212 }
1213
1214 MODULEINFO modinfo;
1215 if (!_GetModuleInformation(hProcess, modules[i],
1216 &modinfo, sizeof(modinfo))) {
1217 modinfo.lpBaseOfDll = NULL;
1218 modinfo.SizeOfImage = 0;
1219 }
1220
1221 // Invoke callback function
1222 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1223 modinfo.SizeOfImage, param);
1224 if (result) break;
1225 }
1226
1227 CloseHandle( hProcess ) ;
1228 return result;
1229 }
1230
1231
1232 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1233 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1234 {
1235 HANDLE hSnapShot ;
1236 static MODULEENTRY32 modentry ;
1237 int result = 0;
1238
1239 if (!_has_toolhelp) return 0;
1240
1241 // Get a handle to a Toolhelp snapshot of the system
1242 hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1243 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1244 return FALSE ;
1245 }
1246
1247 // iterate through all modules
1248 modentry.dwSize = sizeof(MODULEENTRY32) ;
1249 bool not_done = _Module32First( hSnapShot, &modentry ) != 0;
1250
1251 while( not_done ) {
1252 // invoke the callback
1253 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1254 modentry.modBaseSize, param);
1255 if (result) break;
1256
1257 modentry.dwSize = sizeof(MODULEENTRY32) ;
1258 not_done = _Module32Next( hSnapShot, &modentry ) != 0;
1259 }
1260
1261 CloseHandle(hSnapShot);
1262 return result;
1263 }
1264
1265 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1266 {
1267 // Get current process ID if caller doesn't provide it.
1268 if (!pid) pid = os::current_process_id();
1269
1270 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1271 else return _enumerate_modules_windows(pid, func, param);
1272 }
1273
1274 struct _modinfo {
1275 address addr;
1276 char* full_path; // point to a char buffer
1277 int buflen; // size of the buffer
1278 address base_addr;
1279 };
1280
1281 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1282 unsigned size, void * param) {
1283 struct _modinfo *pmod = (struct _modinfo *)param;
1284 if (!pmod) return -1;
1285
1286 if (base_addr <= pmod->addr &&
1287 base_addr+size > pmod->addr) {
1288 // if a buffer is provided, copy path name to the buffer
1289 if (pmod->full_path) {
1290 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1291 }
1292 pmod->base_addr = base_addr;
1293 return 1;
1294 }
1295 return 0;
1296 }
1297
1298 bool os::dll_address_to_library_name(address addr, char* buf,
1299 int buflen, int* offset) {
1300 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1301 // return the full path to the DLL file, sometimes it returns path
1302 // to the corresponding PDB file (debug info); sometimes it only
1303 // returns partial path, which makes life painful.
1304
1305 struct _modinfo mi;
1306 mi.addr = addr;
1307 mi.full_path = buf;
1308 mi.buflen = buflen;
1309 int pid = os::current_process_id();
1310 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1311 // buf already contains path name
1312 if (offset) *offset = addr - mi.base_addr;
1313 return true;
1314 } else {
1315 if (buf) buf[0] = '\0';
1316 if (offset) *offset = -1;
1317 return false;
1318 }
1319 }
1320
1321 bool os::dll_address_to_function_name(address addr, char *buf,
1322 int buflen, int *offset) {
1323 // Unimplemented on Windows - in order to use SymGetSymFromAddr(),
1324 // we need to initialize imagehlp/dbghelp, then load symbol table
1325 // for every module. That's too much work to do after a fatal error.
1326 // For an example on how to implement this function, see 1.4.2.
1327 if (offset) *offset = -1;
1328 if (buf) buf[0] = '\0';
1329 return false;
1330 }
1331
1332 void* os::dll_lookup(void* handle, const char* name) {
1333 return GetProcAddress((HMODULE)handle, name);
1334 }
1335
1336 // save the start and end address of jvm.dll into param[0] and param[1]
1337 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1338 unsigned size, void * param) {
1339 if (!param) return -1;
1340
1341 if (base_addr <= (address)_locate_jvm_dll &&
1342 base_addr+size > (address)_locate_jvm_dll) {
1343 ((address*)param)[0] = base_addr;
1344 ((address*)param)[1] = base_addr + size;
1345 return 1;
1346 }
1347 return 0;
1348 }
1349
1350 address vm_lib_location[2]; // start and end address of jvm.dll
1351
1352 // check if addr is inside jvm.dll
1353 bool os::address_is_in_vm(address addr) {
1354 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1355 int pid = os::current_process_id();
1356 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1357 assert(false, "Can't find jvm module.");
1358 return false;
1359 }
1360 }
1361
1362 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1363 }
1364
1365 // print module info; param is outputStream*
1366 static int _print_module(int pid, char* fname, address base,
1367 unsigned size, void* param) {
1368 if (!param) return -1;
1369
1370 outputStream* st = (outputStream*)param;
1371
1372 address end_addr = base + size;
1373 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1374 return 0;
1375 }
1376
1377 // Loads .dll/.so and
1378 // in case of error it checks if .dll/.so was built for the
1379 // same architecture as Hotspot is running on
1380 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1381 {
1382 void * result = LoadLibrary(name);
1383 if (result != NULL)
1384 {
1385 return result;
1386 }
1387
1388 long errcode = GetLastError();
1389 if (errcode == ERROR_MOD_NOT_FOUND) {
1390 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1391 ebuf[ebuflen-1]='\0';
1392 return NULL;
1393 }
1394
1395 // Parsing dll below
1396 // If we can read dll-info and find that dll was built
1397 // for an architecture other than Hotspot is running in
1398 // - then print to buffer "DLL was built for a different architecture"
1399 // else call getLastErrorString to obtain system error message
1400
1401 // Read system error message into ebuf
1402 // It may or may not be overwritten below (in the for loop and just above)
1403 getLastErrorString(ebuf, (size_t) ebuflen);
1404 ebuf[ebuflen-1]='\0';
1405 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1406 if (file_descriptor<0)
1407 {
1408 return NULL;
1409 }
1410
1411 uint32_t signature_offset;
1412 uint16_t lib_arch=0;
1413 bool failed_to_get_lib_arch=
1414 (
1415 //Go to position 3c in the dll
1416 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1417 ||
1418 // Read loacation of signature
1419 (sizeof(signature_offset)!=
1420 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1421 ||
1422 //Go to COFF File Header in dll
1423 //that is located after"signature" (4 bytes long)
1424 (os::seek_to_file_offset(file_descriptor,
1425 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1426 ||
1427 //Read field that contains code of architecture
1428 // that dll was build for
1429 (sizeof(lib_arch)!=
1430 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1431 );
1432
1433 ::close(file_descriptor);
1434 if (failed_to_get_lib_arch)
1435 {
1436 // file i/o error - report getLastErrorString(...) msg
1437 return NULL;
1438 }
1439
1440 typedef struct
1441 {
1442 uint16_t arch_code;
1443 char* arch_name;
1444 } arch_t;
1445
1446 static const arch_t arch_array[]={
1447 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1448 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1449 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1450 };
1451 #if (defined _M_IA64)
1452 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1453 #elif (defined _M_AMD64)
1454 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1455 #elif (defined _M_IX86)
1456 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1457 #else
1458 #error Method os::dll_load requires that one of following \
1459 is defined :_M_IA64,_M_AMD64 or _M_IX86
1460 #endif
1461
1462
1463 // Obtain a string for printf operation
1464 // lib_arch_str shall contain string what platform this .dll was built for
1465 // running_arch_str shall string contain what platform Hotspot was built for
1466 char *running_arch_str=NULL,*lib_arch_str=NULL;
1467 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1468 {
1469 if (lib_arch==arch_array[i].arch_code)
1470 lib_arch_str=arch_array[i].arch_name;
1471 if (running_arch==arch_array[i].arch_code)
1472 running_arch_str=arch_array[i].arch_name;
1473 }
1474
1475 assert(running_arch_str,
1476 "Didn't find runing architecture code in arch_array");
1477
1478 // If the architure is right
1479 // but some other error took place - report getLastErrorString(...) msg
1480 if (lib_arch == running_arch)
1481 {
1482 return NULL;
1483 }
1484
1485 if (lib_arch_str!=NULL)
1486 {
1487 ::_snprintf(ebuf, ebuflen-1,
1488 "Can't load %s-bit .dll on a %s-bit platform",
1489 lib_arch_str,running_arch_str);
1490 }
1491 else
1492 {
1493 // don't know what architecture this dll was build for
1494 ::_snprintf(ebuf, ebuflen-1,
1495 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1496 lib_arch,running_arch_str);
1497 }
1498
1499 return NULL;
1500 }
1501
1502
1503 void os::print_dll_info(outputStream *st) {
1504 int pid = os::current_process_id();
1505 st->print_cr("Dynamic libraries:");
1506 enumerate_modules(pid, _print_module, (void *)st);
1507 }
1508
1509 // function pointer to Windows API "GetNativeSystemInfo".
1510 typedef void (WINAPI *GetNativeSystemInfo_func_type)(LPSYSTEM_INFO);
1511 static GetNativeSystemInfo_func_type _GetNativeSystemInfo;
1512
1513 void os::print_os_info(outputStream* st) {
1514 st->print("OS:");
1515
1516 OSVERSIONINFOEX osvi;
1517 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1518 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1519
1520 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1521 st->print_cr("N/A");
1522 return;
1523 }
1524
1525 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1526 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1527 switch (os_vers) {
1528 case 3051: st->print(" Windows NT 3.51"); break;
1529 case 4000: st->print(" Windows NT 4.0"); break;
1530 case 5000: st->print(" Windows 2000"); break;
1531 case 5001: st->print(" Windows XP"); break;
1532 case 5002:
1533 case 6000:
1534 case 6001: {
1535 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1536 // find out whether we are running on 64 bit processor or not.
1537 SYSTEM_INFO si;
1538 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1539 // Check to see if _GetNativeSystemInfo has been initialized.
1540 if (_GetNativeSystemInfo == NULL) {
1541 HMODULE hKernel32 = GetModuleHandle(TEXT("kernel32.dll"));
1542 _GetNativeSystemInfo =
1543 CAST_TO_FN_PTR(GetNativeSystemInfo_func_type,
1544 GetProcAddress(hKernel32,
1545 "GetNativeSystemInfo"));
1546 if (_GetNativeSystemInfo == NULL)
1547 GetSystemInfo(&si);
1548 } else {
1549 _GetNativeSystemInfo(&si);
1550 }
1551 if (os_vers == 5002) {
1552 if (osvi.wProductType == VER_NT_WORKSTATION &&
1553 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1554 st->print(" Windows XP x64 Edition");
1555 else
1556 st->print(" Windows Server 2003 family");
1557 } else if (os_vers == 6000) {
1558 if (osvi.wProductType == VER_NT_WORKSTATION)
1559 st->print(" Windows Vista");
1560 else
1561 st->print(" Windows Server 2008");
1562 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1563 st->print(" , 64 bit");
1564 } else if (os_vers == 6001) {
1565 if (osvi.wProductType == VER_NT_WORKSTATION) {
1566 st->print(" Windows 7");
1567 } else {
1568 // Unrecognized windows, print out its major and minor versions
1569 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1570 }
1571 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1572 st->print(" , 64 bit");
1573 } else { // future os
1574 // Unrecognized windows, print out its major and minor versions
1575 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1576 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1577 st->print(" , 64 bit");
1578 }
1579 break;
1580 }
1581 default: // future windows, print out its major and minor versions
1582 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1583 }
1584 } else {
1585 switch (os_vers) {
1586 case 4000: st->print(" Windows 95"); break;
1587 case 4010: st->print(" Windows 98"); break;
1588 case 4090: st->print(" Windows Me"); break;
1589 default: // future windows, print out its major and minor versions
1590 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1591 }
1592 }
1593 st->print(" Build %d", osvi.dwBuildNumber);
1594 st->print(" %s", osvi.szCSDVersion); // service pack
1595 st->cr();
1596 }
1597
1598 void os::print_memory_info(outputStream* st) {
1599 st->print("Memory:");
1600 st->print(" %dk page", os::vm_page_size()>>10);
1601
1602 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1603 // value if total memory is larger than 4GB
1604 MEMORYSTATUSEX ms;
1605 ms.dwLength = sizeof(ms);
1606 GlobalMemoryStatusEx(&ms);
1607
1608 st->print(", physical %uk", os::physical_memory() >> 10);
1609 st->print("(%uk free)", os::available_memory() >> 10);
1610
1611 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1612 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1613 st->cr();
1614 }
1615
1616 void os::print_siginfo(outputStream *st, void *siginfo) {
1617 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1618 st->print("siginfo:");
1619 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1620
1621 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1622 er->NumberParameters >= 2) {
1623 switch (er->ExceptionInformation[0]) {
1624 case 0: st->print(", reading address"); break;
1625 case 1: st->print(", writing address"); break;
1626 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1627 er->ExceptionInformation[0]);
1628 }
1629 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1630 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1631 er->NumberParameters >= 2 && UseSharedSpaces) {
1632 FileMapInfo* mapinfo = FileMapInfo::current_info();
1633 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1634 st->print("\n\nError accessing class data sharing archive." \
1635 " Mapped file inaccessible during execution, " \
1636 " possible disk/network problem.");
1637 }
1638 } else {
1639 int num = er->NumberParameters;
1640 if (num > 0) {
1641 st->print(", ExceptionInformation=");
1642 for (int i = 0; i < num; i++) {
1643 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1644 }
1645 }
1646 }
1647 st->cr();
1648 }
1649
1650 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1651 // do nothing
1652 }
1653
1654 static char saved_jvm_path[MAX_PATH] = {0};
1655
1656 // Find the full path to the current module, jvm.dll or jvm_g.dll
1657 void os::jvm_path(char *buf, jint buflen) {
1658 // Error checking.
1659 if (buflen < MAX_PATH) {
1660 assert(false, "must use a large-enough buffer");
1661 buf[0] = '\0';
1662 return;
1663 }
1664 // Lazy resolve the path to current module.
1665 if (saved_jvm_path[0] != 0) {
1666 strcpy(buf, saved_jvm_path);
1667 return;
1668 }
1669
1670 GetModuleFileName(vm_lib_handle, buf, buflen);
1671 strcpy(saved_jvm_path, buf);
1672 }
1673
1674
1675 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1676 #ifndef _WIN64
1677 st->print("_");
1678 #endif
1679 }
1680
1681
1682 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1683 #ifndef _WIN64
1684 st->print("@%d", args_size * sizeof(int));
1685 #endif
1686 }
1687
1688 // sun.misc.Signal
1689 // NOTE that this is a workaround for an apparent kernel bug where if
1690 // a signal handler for SIGBREAK is installed then that signal handler
1691 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1692 // See bug 4416763.
1693 static void (*sigbreakHandler)(int) = NULL;
1694
1695 static void UserHandler(int sig, void *siginfo, void *context) {
1696 os::signal_notify(sig);
1697 // We need to reinstate the signal handler each time...
1698 os::signal(sig, (void*)UserHandler);
1699 }
1700
1701 void* os::user_handler() {
1702 return (void*) UserHandler;
1703 }
1704
1705 void* os::signal(int signal_number, void* handler) {
1706 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1707 void (*oldHandler)(int) = sigbreakHandler;
1708 sigbreakHandler = (void (*)(int)) handler;
1709 return (void*) oldHandler;
1710 } else {
1711 return (void*)::signal(signal_number, (void (*)(int))handler);
1712 }
1713 }
1714
1715 void os::signal_raise(int signal_number) {
1716 raise(signal_number);
1717 }
1718
1719 // The Win32 C runtime library maps all console control events other than ^C
1720 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1721 // logoff, and shutdown events. We therefore install our own console handler
1722 // that raises SIGTERM for the latter cases.
1723 //
1724 static BOOL WINAPI consoleHandler(DWORD event) {
1725 switch(event) {
1726 case CTRL_C_EVENT:
1727 if (is_error_reported()) {
1728 // Ctrl-C is pressed during error reporting, likely because the error
1729 // handler fails to abort. Let VM die immediately.
1730 os::die();
1731 }
1732
1733 os::signal_raise(SIGINT);
1734 return TRUE;
1735 break;
1736 case CTRL_BREAK_EVENT:
1737 if (sigbreakHandler != NULL) {
1738 (*sigbreakHandler)(SIGBREAK);
1739 }
1740 return TRUE;
1741 break;
1742 case CTRL_CLOSE_EVENT:
1743 case CTRL_LOGOFF_EVENT:
1744 case CTRL_SHUTDOWN_EVENT:
1745 os::signal_raise(SIGTERM);
1746 return TRUE;
1747 break;
1748 default:
1749 break;
1750 }
1751 return FALSE;
1752 }
1753
1754 /*
1755 * The following code is moved from os.cpp for making this
1756 * code platform specific, which it is by its very nature.
1757 */
1758
1759 // Return maximum OS signal used + 1 for internal use only
1760 // Used as exit signal for signal_thread
1761 int os::sigexitnum_pd(){
1762 return NSIG;
1763 }
1764
1765 // a counter for each possible signal value, including signal_thread exit signal
1766 static volatile jint pending_signals[NSIG+1] = { 0 };
1767 static HANDLE sig_sem;
1768
1769 void os::signal_init_pd() {
1770 // Initialize signal structures
1771 memset((void*)pending_signals, 0, sizeof(pending_signals));
1772
1773 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
1774
1775 // Programs embedding the VM do not want it to attempt to receive
1776 // events like CTRL_LOGOFF_EVENT, which are used to implement the
1777 // shutdown hooks mechanism introduced in 1.3. For example, when
1778 // the VM is run as part of a Windows NT service (i.e., a servlet
1779 // engine in a web server), the correct behavior is for any console
1780 // control handler to return FALSE, not TRUE, because the OS's
1781 // "final" handler for such events allows the process to continue if
1782 // it is a service (while terminating it if it is not a service).
1783 // To make this behavior uniform and the mechanism simpler, we
1784 // completely disable the VM's usage of these console events if -Xrs
1785 // (=ReduceSignalUsage) is specified. This means, for example, that
1786 // the CTRL-BREAK thread dump mechanism is also disabled in this
1787 // case. See bugs 4323062, 4345157, and related bugs.
1788
1789 if (!ReduceSignalUsage) {
1790 // Add a CTRL-C handler
1791 SetConsoleCtrlHandler(consoleHandler, TRUE);
1792 }
1793 }
1794
1795 void os::signal_notify(int signal_number) {
1796 BOOL ret;
1797
1798 Atomic::inc(&pending_signals[signal_number]);
1799 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1800 assert(ret != 0, "ReleaseSemaphore() failed");
1801 }
1802
1803 static int check_pending_signals(bool wait_for_signal) {
1804 DWORD ret;
1805 while (true) {
1806 for (int i = 0; i < NSIG + 1; i++) {
1807 jint n = pending_signals[i];
1808 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1809 return i;
1810 }
1811 }
1812 if (!wait_for_signal) {
1813 return -1;
1814 }
1815
1816 JavaThread *thread = JavaThread::current();
1817
1818 ThreadBlockInVM tbivm(thread);
1819
1820 bool threadIsSuspended;
1821 do {
1822 thread->set_suspend_equivalent();
1823 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1824 ret = ::WaitForSingleObject(sig_sem, INFINITE);
1825 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
1826
1827 // were we externally suspended while we were waiting?
1828 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1829 if (threadIsSuspended) {
1830 //
1831 // The semaphore has been incremented, but while we were waiting
1832 // another thread suspended us. We don't want to continue running
1833 // while suspended because that would surprise the thread that
1834 // suspended us.
1835 //
1836 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1837 assert(ret != 0, "ReleaseSemaphore() failed");
1838
1839 thread->java_suspend_self();
1840 }
1841 } while (threadIsSuspended);
1842 }
1843 }
1844
1845 int os::signal_lookup() {
1846 return check_pending_signals(false);
1847 }
1848
1849 int os::signal_wait() {
1850 return check_pending_signals(true);
1851 }
1852
1853 // Implicit OS exception handling
1854
1855 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
1856 JavaThread* thread = JavaThread::current();
1857 // Save pc in thread
1858 #ifdef _M_IA64
1859 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP);
1860 // Set pc to handler
1861 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
1862 #elif _M_AMD64
1863 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip);
1864 // Set pc to handler
1865 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
1866 #else
1867 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip);
1868 // Set pc to handler
1869 exceptionInfo->ContextRecord->Eip = (LONG)handler;
1870 #endif
1871
1872 // Continue the execution
1873 return EXCEPTION_CONTINUE_EXECUTION;
1874 }
1875
1876
1877 // Used for PostMortemDump
1878 extern "C" void safepoints();
1879 extern "C" void find(int x);
1880 extern "C" void events();
1881
1882 // According to Windows API documentation, an illegal instruction sequence should generate
1883 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
1884 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
1885 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
1886
1887 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
1888
1889 // From "Execution Protection in the Windows Operating System" draft 0.35
1890 // Once a system header becomes available, the "real" define should be
1891 // included or copied here.
1892 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
1893
1894 #define def_excpt(val) #val, val
1895
1896 struct siglabel {
1897 char *name;
1898 int number;
1899 };
1900
1901 struct siglabel exceptlabels[] = {
1902 def_excpt(EXCEPTION_ACCESS_VIOLATION),
1903 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
1904 def_excpt(EXCEPTION_BREAKPOINT),
1905 def_excpt(EXCEPTION_SINGLE_STEP),
1906 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
1907 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
1908 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
1909 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
1910 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
1911 def_excpt(EXCEPTION_FLT_OVERFLOW),
1912 def_excpt(EXCEPTION_FLT_STACK_CHECK),
1913 def_excpt(EXCEPTION_FLT_UNDERFLOW),
1914 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
1915 def_excpt(EXCEPTION_INT_OVERFLOW),
1916 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
1917 def_excpt(EXCEPTION_IN_PAGE_ERROR),
1918 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
1919 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
1920 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
1921 def_excpt(EXCEPTION_STACK_OVERFLOW),
1922 def_excpt(EXCEPTION_INVALID_DISPOSITION),
1923 def_excpt(EXCEPTION_GUARD_PAGE),
1924 def_excpt(EXCEPTION_INVALID_HANDLE),
1925 NULL, 0
1926 };
1927
1928 const char* os::exception_name(int exception_code, char *buf, size_t size) {
1929 for (int i = 0; exceptlabels[i].name != NULL; i++) {
1930 if (exceptlabels[i].number == exception_code) {
1931 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
1932 return buf;
1933 }
1934 }
1935
1936 return NULL;
1937 }
1938
1939 //-----------------------------------------------------------------------------
1940 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
1941 // handle exception caused by idiv; should only happen for -MinInt/-1
1942 // (division by zero is handled explicitly)
1943 #ifdef _M_IA64
1944 assert(0, "Fix Handle_IDiv_Exception");
1945 #elif _M_AMD64
1946 PCONTEXT ctx = exceptionInfo->ContextRecord;
1947 address pc = (address)ctx->Rip;
1948 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
1949 assert(pc[0] == 0xF7, "not an idiv opcode");
1950 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
1951 assert(ctx->Rax == min_jint, "unexpected idiv exception");
1952 // set correct result values and continue after idiv instruction
1953 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
1954 ctx->Rax = (DWORD)min_jint; // result
1955 ctx->Rdx = (DWORD)0; // remainder
1956 // Continue the execution
1957 #else
1958 PCONTEXT ctx = exceptionInfo->ContextRecord;
1959 address pc = (address)ctx->Eip;
1960 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
1961 assert(pc[0] == 0xF7, "not an idiv opcode");
1962 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
1963 assert(ctx->Eax == min_jint, "unexpected idiv exception");
1964 // set correct result values and continue after idiv instruction
1965 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
1966 ctx->Eax = (DWORD)min_jint; // result
1967 ctx->Edx = (DWORD)0; // remainder
1968 // Continue the execution
1969 #endif
1970 return EXCEPTION_CONTINUE_EXECUTION;
1971 }
1972
1973 #ifndef _WIN64
1974 //-----------------------------------------------------------------------------
1975 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
1976 // handle exception caused by native method modifying control word
1977 PCONTEXT ctx = exceptionInfo->ContextRecord;
1978 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
1979
1980 switch (exception_code) {
1981 case EXCEPTION_FLT_DENORMAL_OPERAND:
1982 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
1983 case EXCEPTION_FLT_INEXACT_RESULT:
1984 case EXCEPTION_FLT_INVALID_OPERATION:
1985 case EXCEPTION_FLT_OVERFLOW:
1986 case EXCEPTION_FLT_STACK_CHECK:
1987 case EXCEPTION_FLT_UNDERFLOW:
1988 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
1989 if (fp_control_word != ctx->FloatSave.ControlWord) {
1990 // Restore FPCW and mask out FLT exceptions
1991 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
1992 // Mask out pending FLT exceptions
1993 ctx->FloatSave.StatusWord &= 0xffffff00;
1994 return EXCEPTION_CONTINUE_EXECUTION;
1995 }
1996 }
1997
1998 if (prev_uef_handler != NULL) {
1999 // We didn't handle this exception so pass it to the previous
2000 // UnhandledExceptionFilter.
2001 return (prev_uef_handler)(exceptionInfo);
2002 }
2003
2004 return EXCEPTION_CONTINUE_SEARCH;
2005 }
2006 #else //_WIN64
2007 /*
2008 On Windows, the mxcsr control bits are non-volatile across calls
2009 See also CR 6192333
2010 If EXCEPTION_FLT_* happened after some native method modified
2011 mxcsr - it is not a jvm fault.
2012 However should we decide to restore of mxcsr after a faulty
2013 native method we can uncomment following code
2014 jint MxCsr = INITIAL_MXCSR;
2015 // we can't use StubRoutines::addr_mxcsr_std()
2016 // because in Win64 mxcsr is not saved there
2017 if (MxCsr != ctx->MxCsr) {
2018 ctx->MxCsr = MxCsr;
2019 return EXCEPTION_CONTINUE_EXECUTION;
2020 }
2021
2022 */
2023 #endif //_WIN64
2024
2025
2026 // Fatal error reporting is single threaded so we can make this a
2027 // static and preallocated. If it's more than MAX_PATH silently ignore
2028 // it.
2029 static char saved_error_file[MAX_PATH] = {0};
2030
2031 void os::set_error_file(const char *logfile) {
2032 if (strlen(logfile) <= MAX_PATH) {
2033 strncpy(saved_error_file, logfile, MAX_PATH);
2034 }
2035 }
2036
2037 static inline void report_error(Thread* t, DWORD exception_code,
2038 address addr, void* siginfo, void* context) {
2039 VMError err(t, exception_code, addr, siginfo, context);
2040 err.report_and_die();
2041
2042 // If UseOsErrorReporting, this will return here and save the error file
2043 // somewhere where we can find it in the minidump.
2044 }
2045
2046 //-----------------------------------------------------------------------------
2047 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2048 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2049 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2050 #ifdef _M_IA64
2051 address pc = (address) exceptionInfo->ContextRecord->StIIP;
2052 #elif _M_AMD64
2053 address pc = (address) exceptionInfo->ContextRecord->Rip;
2054 #else
2055 address pc = (address) exceptionInfo->ContextRecord->Eip;
2056 #endif
2057 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2058
2059 #ifndef _WIN64
2060 // Execution protection violation - win32 running on AMD64 only
2061 // Handled first to avoid misdiagnosis as a "normal" access violation;
2062 // This is safe to do because we have a new/unique ExceptionInformation
2063 // code for this condition.
2064 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2065 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2066 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2067 address addr = (address) exceptionRecord->ExceptionInformation[1];
2068
2069 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2070 int page_size = os::vm_page_size();
2071
2072 // Make sure the pc and the faulting address are sane.
2073 //
2074 // If an instruction spans a page boundary, and the page containing
2075 // the beginning of the instruction is executable but the following
2076 // page is not, the pc and the faulting address might be slightly
2077 // different - we still want to unguard the 2nd page in this case.
2078 //
2079 // 15 bytes seems to be a (very) safe value for max instruction size.
2080 bool pc_is_near_addr =
2081 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2082 bool instr_spans_page_boundary =
2083 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2084 (intptr_t) page_size) > 0);
2085
2086 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2087 static volatile address last_addr =
2088 (address) os::non_memory_address_word();
2089
2090 // In conservative mode, don't unguard unless the address is in the VM
2091 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2092 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2093
2094 // Set memory to RWX and retry
2095 address page_start =
2096 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2097 bool res = os::protect_memory((char*) page_start, page_size,
2098 os::MEM_PROT_RWX);
2099
2100 if (PrintMiscellaneous && Verbose) {
2101 char buf[256];
2102 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2103 "at " INTPTR_FORMAT
2104 ", unguarding " INTPTR_FORMAT ": %s", addr,
2105 page_start, (res ? "success" : strerror(errno)));
2106 tty->print_raw_cr(buf);
2107 }
2108
2109 // Set last_addr so if we fault again at the same address, we don't
2110 // end up in an endless loop.
2111 //
2112 // There are two potential complications here. Two threads trapping
2113 // at the same address at the same time could cause one of the
2114 // threads to think it already unguarded, and abort the VM. Likely
2115 // very rare.
2116 //
2117 // The other race involves two threads alternately trapping at
2118 // different addresses and failing to unguard the page, resulting in
2119 // an endless loop. This condition is probably even more unlikely
2120 // than the first.
2121 //
2122 // Although both cases could be avoided by using locks or thread
2123 // local last_addr, these solutions are unnecessary complication:
2124 // this handler is a best-effort safety net, not a complete solution.
2125 // It is disabled by default and should only be used as a workaround
2126 // in case we missed any no-execute-unsafe VM code.
2127
2128 last_addr = addr;
2129
2130 return EXCEPTION_CONTINUE_EXECUTION;
2131 }
2132 }
2133
2134 // Last unguard failed or not unguarding
2135 tty->print_raw_cr("Execution protection violation");
2136 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2137 exceptionInfo->ContextRecord);
2138 return EXCEPTION_CONTINUE_SEARCH;
2139 }
2140 }
2141 #endif // _WIN64
2142
2143 // Check to see if we caught the safepoint code in the
2144 // process of write protecting the memory serialization page.
2145 // It write enables the page immediately after protecting it
2146 // so just return.
2147 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2148 JavaThread* thread = (JavaThread*) t;
2149 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2150 address addr = (address) exceptionRecord->ExceptionInformation[1];
2151 if ( os::is_memory_serialize_page(thread, addr) ) {
2152 // Block current thread until the memory serialize page permission restored.
2153 os::block_on_serialize_page_trap();
2154 return EXCEPTION_CONTINUE_EXECUTION;
2155 }
2156 }
2157
2158
2159 if (t != NULL && t->is_Java_thread()) {
2160 JavaThread* thread = (JavaThread*) t;
2161 bool in_java = thread->thread_state() == _thread_in_Java;
2162
2163 // Handle potential stack overflows up front.
2164 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2165 if (os::uses_stack_guard_pages()) {
2166 #ifdef _M_IA64
2167 //
2168 // If it's a legal stack address continue, Windows will map it in.
2169 //
2170 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2171 address addr = (address) exceptionRecord->ExceptionInformation[1];
2172 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() )
2173 return EXCEPTION_CONTINUE_EXECUTION;
2174
2175 // The register save area is the same size as the memory stack
2176 // and starts at the page just above the start of the memory stack.
2177 // If we get a fault in this area, we've run out of register
2178 // stack. If we are in java, try throwing a stack overflow exception.
2179 if (addr > thread->stack_base() &&
2180 addr <= (thread->stack_base()+thread->stack_size()) ) {
2181 char buf[256];
2182 jio_snprintf(buf, sizeof(buf),
2183 "Register stack overflow, addr:%p, stack_base:%p\n",
2184 addr, thread->stack_base() );
2185 tty->print_raw_cr(buf);
2186 // If not in java code, return and hope for the best.
2187 return in_java ? Handle_Exception(exceptionInfo,
2188 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2189 : EXCEPTION_CONTINUE_EXECUTION;
2190 }
2191 #endif
2192 if (thread->stack_yellow_zone_enabled()) {
2193 // Yellow zone violation. The o/s has unprotected the first yellow
2194 // zone page for us. Note: must call disable_stack_yellow_zone to
2195 // update the enabled status, even if the zone contains only one page.
2196 thread->disable_stack_yellow_zone();
2197 // If not in java code, return and hope for the best.
2198 return in_java ? Handle_Exception(exceptionInfo,
2199 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2200 : EXCEPTION_CONTINUE_EXECUTION;
2201 } else {
2202 // Fatal red zone violation.
2203 thread->disable_stack_red_zone();
2204 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2205 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2206 exceptionInfo->ContextRecord);
2207 return EXCEPTION_CONTINUE_SEARCH;
2208 }
2209 } else if (in_java) {
2210 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2211 // a one-time-only guard page, which it has released to us. The next
2212 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2213 return Handle_Exception(exceptionInfo,
2214 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2215 } else {
2216 // Can only return and hope for the best. Further stack growth will
2217 // result in an ACCESS_VIOLATION.
2218 return EXCEPTION_CONTINUE_EXECUTION;
2219 }
2220 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2221 // Either stack overflow or null pointer exception.
2222 if (in_java) {
2223 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2224 address addr = (address) exceptionRecord->ExceptionInformation[1];
2225 address stack_end = thread->stack_base() - thread->stack_size();
2226 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2227 // Stack overflow.
2228 assert(!os::uses_stack_guard_pages(),
2229 "should be caught by red zone code above.");
2230 return Handle_Exception(exceptionInfo,
2231 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2232 }
2233 //
2234 // Check for safepoint polling and implicit null
2235 // We only expect null pointers in the stubs (vtable)
2236 // the rest are checked explicitly now.
2237 //
2238 CodeBlob* cb = CodeCache::find_blob(pc);
2239 if (cb != NULL) {
2240 if (os::is_poll_address(addr)) {
2241 address stub = SharedRuntime::get_poll_stub(pc);
2242 return Handle_Exception(exceptionInfo, stub);
2243 }
2244 }
2245 {
2246 #ifdef _WIN64
2247 //
2248 // If it's a legal stack address map the entire region in
2249 //
2250 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2251 address addr = (address) exceptionRecord->ExceptionInformation[1];
2252 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2253 addr = (address)((uintptr_t)addr &
2254 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2255 os::commit_memory((char *)addr, thread->stack_base() - addr,
2256 false );
2257 return EXCEPTION_CONTINUE_EXECUTION;
2258 }
2259 else
2260 #endif
2261 {
2262 // Null pointer exception.
2263 #ifdef _M_IA64
2264 // We catch register stack overflows in compiled code by doing
2265 // an explicit compare and executing a st8(G0, G0) if the
2266 // BSP enters into our guard area. We test for the overflow
2267 // condition and fall into the normal null pointer exception
2268 // code if BSP hasn't overflowed.
2269 if ( in_java ) {
2270 if(thread->register_stack_overflow()) {
2271 assert((address)exceptionInfo->ContextRecord->IntS3 ==
2272 thread->register_stack_limit(),
2273 "GR7 doesn't contain register_stack_limit");
2274 // Disable the yellow zone which sets the state that
2275 // we've got a stack overflow problem.
2276 if (thread->stack_yellow_zone_enabled()) {
2277 thread->disable_stack_yellow_zone();
2278 }
2279 // Give us some room to process the exception
2280 thread->disable_register_stack_guard();
2281 // Update GR7 with the new limit so we can continue running
2282 // compiled code.
2283 exceptionInfo->ContextRecord->IntS3 =
2284 (ULONGLONG)thread->register_stack_limit();
2285 return Handle_Exception(exceptionInfo,
2286 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2287 } else {
2288 //
2289 // Check for implicit null
2290 // We only expect null pointers in the stubs (vtable)
2291 // the rest are checked explicitly now.
2292 //
2293 if (((uintptr_t)addr) < os::vm_page_size() ) {
2294 // an access to the first page of VM--assume it is a null pointer
2295 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2296 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2297 }
2298 }
2299 } // in_java
2300
2301 // IA64 doesn't use implicit null checking yet. So we shouldn't
2302 // get here.
2303 tty->print_raw_cr("Access violation, possible null pointer exception");
2304 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2305 exceptionInfo->ContextRecord);
2306 return EXCEPTION_CONTINUE_SEARCH;
2307 #else /* !IA64 */
2308
2309 // Windows 98 reports faulting addresses incorrectly
2310 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2311 !os::win32::is_nt()) {
2312 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2313 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2314 }
2315 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2316 exceptionInfo->ContextRecord);
2317 return EXCEPTION_CONTINUE_SEARCH;
2318 #endif
2319 }
2320 }
2321 }
2322
2323 #ifdef _WIN64
2324 // Special care for fast JNI field accessors.
2325 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2326 // in and the heap gets shrunk before the field access.
2327 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2328 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2329 if (addr != (address)-1) {
2330 return Handle_Exception(exceptionInfo, addr);
2331 }
2332 }
2333 #endif
2334
2335 #ifdef _WIN64
2336 // Windows will sometimes generate an access violation
2337 // when we call malloc. Since we use VectoredExceptions
2338 // on 64 bit platforms, we see this exception. We must
2339 // pass this exception on so Windows can recover.
2340 // We check to see if the pc of the fault is in NTDLL.DLL
2341 // if so, we pass control on to Windows for handling.
2342 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH;
2343 #endif
2344
2345 // Stack overflow or null pointer exception in native code.
2346 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2347 exceptionInfo->ContextRecord);
2348 return EXCEPTION_CONTINUE_SEARCH;
2349 }
2350
2351 if (in_java) {
2352 switch (exception_code) {
2353 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2354 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2355
2356 case EXCEPTION_INT_OVERFLOW:
2357 return Handle_IDiv_Exception(exceptionInfo);
2358
2359 } // switch
2360 }
2361 #ifndef _WIN64
2362 if ((thread->thread_state() == _thread_in_Java) ||
2363 (thread->thread_state() == _thread_in_native) )
2364 {
2365 LONG result=Handle_FLT_Exception(exceptionInfo);
2366 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2367 }
2368 #endif //_WIN64
2369 }
2370
2371 if (exception_code != EXCEPTION_BREAKPOINT) {
2372 #ifndef _WIN64
2373 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2374 exceptionInfo->ContextRecord);
2375 #else
2376 // Itanium Windows uses a VectoredExceptionHandler
2377 // Which means that C++ programatic exception handlers (try/except)
2378 // will get here. Continue the search for the right except block if
2379 // the exception code is not a fatal code.
2380 switch ( exception_code ) {
2381 case EXCEPTION_ACCESS_VIOLATION:
2382 case EXCEPTION_STACK_OVERFLOW:
2383 case EXCEPTION_ILLEGAL_INSTRUCTION:
2384 case EXCEPTION_ILLEGAL_INSTRUCTION_2:
2385 case EXCEPTION_INT_OVERFLOW:
2386 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2387 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2388 exceptionInfo->ContextRecord);
2389 }
2390 break;
2391 default:
2392 break;
2393 }
2394 #endif
2395 }
2396 return EXCEPTION_CONTINUE_SEARCH;
2397 }
2398
2399 #ifndef _WIN64
2400 // Special care for fast JNI accessors.
2401 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2402 // the heap gets shrunk before the field access.
2403 // Need to install our own structured exception handler since native code may
2404 // install its own.
2405 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2406 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2407 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2408 address pc = (address) exceptionInfo->ContextRecord->Eip;
2409 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2410 if (addr != (address)-1) {
2411 return Handle_Exception(exceptionInfo, addr);
2412 }
2413 }
2414 return EXCEPTION_CONTINUE_SEARCH;
2415 }
2416
2417 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2418 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2419 __try { \
2420 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2421 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2422 } \
2423 return 0; \
2424 }
2425
2426 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2427 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2428 DEFINE_FAST_GETFIELD(jchar, char, Char)
2429 DEFINE_FAST_GETFIELD(jshort, short, Short)
2430 DEFINE_FAST_GETFIELD(jint, int, Int)
2431 DEFINE_FAST_GETFIELD(jlong, long, Long)
2432 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2433 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2434
2435 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2436 switch (type) {
2437 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2438 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2439 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2440 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2441 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2442 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2443 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2444 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2445 default: ShouldNotReachHere();
2446 }
2447 return (address)-1;
2448 }
2449 #endif
2450
2451 // Virtual Memory
2452
2453 int os::vm_page_size() { return os::win32::vm_page_size(); }
2454 int os::vm_allocation_granularity() {
2455 return os::win32::vm_allocation_granularity();
2456 }
2457
2458 // Windows large page support is available on Windows 2003. In order to use
2459 // large page memory, the administrator must first assign additional privilege
2460 // to the user:
2461 // + select Control Panel -> Administrative Tools -> Local Security Policy
2462 // + select Local Policies -> User Rights Assignment
2463 // + double click "Lock pages in memory", add users and/or groups
2464 // + reboot
2465 // Note the above steps are needed for administrator as well, as administrators
2466 // by default do not have the privilege to lock pages in memory.
2467 //
2468 // Note about Windows 2003: although the API supports committing large page
2469 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2470 // scenario, I found through experiment it only uses large page if the entire
2471 // memory region is reserved and committed in a single VirtualAlloc() call.
2472 // This makes Windows large page support more or less like Solaris ISM, in
2473 // that the entire heap must be committed upfront. This probably will change
2474 // in the future, if so the code below needs to be revisited.
2475
2476 #ifndef MEM_LARGE_PAGES
2477 #define MEM_LARGE_PAGES 0x20000000
2478 #endif
2479
2480 // GetLargePageMinimum is only available on Windows 2003. The other functions
2481 // are available on NT but not on Windows 98/Me. We have to resolve them at
2482 // runtime.
2483 typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void);
2484 typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type)
2485 (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
2486 typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE);
2487 typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID);
2488
2489 static GetLargePageMinimum_func_type _GetLargePageMinimum;
2490 static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges;
2491 static OpenProcessToken_func_type _OpenProcessToken;
2492 static LookupPrivilegeValue_func_type _LookupPrivilegeValue;
2493
2494 static HINSTANCE _kernel32;
2495 static HINSTANCE _advapi32;
2496 static HANDLE _hProcess;
2497 static HANDLE _hToken;
2498
2499 static size_t _large_page_size = 0;
2500
2501 static bool resolve_functions_for_large_page_init() {
2502 _kernel32 = LoadLibrary("kernel32.dll");
2503 if (_kernel32 == NULL) return false;
2504
2505 _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type,
2506 GetProcAddress(_kernel32, "GetLargePageMinimum"));
2507 if (_GetLargePageMinimum == NULL) return false;
2508
2509 _advapi32 = LoadLibrary("advapi32.dll");
2510 if (_advapi32 == NULL) return false;
2511
2512 _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type,
2513 GetProcAddress(_advapi32, "AdjustTokenPrivileges"));
2514 _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type,
2515 GetProcAddress(_advapi32, "OpenProcessToken"));
2516 _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type,
2517 GetProcAddress(_advapi32, "LookupPrivilegeValueA"));
2518 return _AdjustTokenPrivileges != NULL &&
2519 _OpenProcessToken != NULL &&
2520 _LookupPrivilegeValue != NULL;
2521 }
2522
2523 static bool request_lock_memory_privilege() {
2524 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2525 os::current_process_id());
2526
2527 LUID luid;
2528 if (_hProcess != NULL &&
2529 _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2530 _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2531
2532 TOKEN_PRIVILEGES tp;
2533 tp.PrivilegeCount = 1;
2534 tp.Privileges[0].Luid = luid;
2535 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2536
2537 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2538 // privilege. Check GetLastError() too. See MSDN document.
2539 if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2540 (GetLastError() == ERROR_SUCCESS)) {
2541 return true;
2542 }
2543 }
2544
2545 return false;
2546 }
2547
2548 static void cleanup_after_large_page_init() {
2549 _GetLargePageMinimum = NULL;
2550 _AdjustTokenPrivileges = NULL;
2551 _OpenProcessToken = NULL;
2552 _LookupPrivilegeValue = NULL;
2553 if (_kernel32) FreeLibrary(_kernel32);
2554 _kernel32 = NULL;
2555 if (_advapi32) FreeLibrary(_advapi32);
2556 _advapi32 = NULL;
2557 if (_hProcess) CloseHandle(_hProcess);
2558 _hProcess = NULL;
2559 if (_hToken) CloseHandle(_hToken);
2560 _hToken = NULL;
2561 }
2562
2563 bool os::large_page_init() {
2564 if (!UseLargePages) return false;
2565
2566 // print a warning if any large page related flag is specified on command line
2567 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2568 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2569 bool success = false;
2570
2571 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2572 if (resolve_functions_for_large_page_init()) {
2573 if (request_lock_memory_privilege()) {
2574 size_t s = _GetLargePageMinimum();
2575 if (s) {
2576 #if defined(IA32) || defined(AMD64)
2577 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2578 WARN("JVM cannot use large pages bigger than 4mb.");
2579 } else {
2580 #endif
2581 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2582 _large_page_size = LargePageSizeInBytes;
2583 } else {
2584 _large_page_size = s;
2585 }
2586 success = true;
2587 #if defined(IA32) || defined(AMD64)
2588 }
2589 #endif
2590 } else {
2591 WARN("Large page is not supported by the processor.");
2592 }
2593 } else {
2594 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2595 }
2596 } else {
2597 WARN("Large page is not supported by the operating system.");
2598 }
2599 #undef WARN
2600
2601 const size_t default_page_size = (size_t) vm_page_size();
2602 if (success && _large_page_size > default_page_size) {
2603 _page_sizes[0] = _large_page_size;
2604 _page_sizes[1] = default_page_size;
2605 _page_sizes[2] = 0;
2606 }
2607
2608 cleanup_after_large_page_init();
2609 return success;
2610 }
2611
2612 // On win32, one cannot release just a part of reserved memory, it's an
2613 // all or nothing deal. When we split a reservation, we must break the
2614 // reservation into two reservations.
2615 void os::split_reserved_memory(char *base, size_t size, size_t split,
2616 bool realloc) {
2617 if (size > 0) {
2618 release_memory(base, size);
2619 if (realloc) {
2620 reserve_memory(split, base);
2621 }
2622 if (size != split) {
2623 reserve_memory(size - split, base + split);
2624 }
2625 }
2626 }
2627
2628 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
2629 assert((size_t)addr % os::vm_allocation_granularity() == 0,
2630 "reserve alignment");
2631 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
2632 char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
2633 assert(res == NULL || addr == NULL || addr == res,
2634 "Unexpected address from reserve.");
2635 return res;
2636 }
2637
2638 // Reserve memory at an arbitrary address, only if that area is
2639 // available (and not reserved for something else).
2640 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2641 // Windows os::reserve_memory() fails of the requested address range is
2642 // not avilable.
2643 return reserve_memory(bytes, requested_addr);
2644 }
2645
2646 size_t os::large_page_size() {
2647 return _large_page_size;
2648 }
2649
2650 bool os::can_commit_large_page_memory() {
2651 // Windows only uses large page memory when the entire region is reserved
2652 // and committed in a single VirtualAlloc() call. This may change in the
2653 // future, but with Windows 2003 it's not possible to commit on demand.
2654 return false;
2655 }
2656
2657 bool os::can_execute_large_page_memory() {
2658 return true;
2659 }
2660
2661 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
2662
2663 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
2664
2665 if (UseLargePagesIndividualAllocation) {
2666 if (TracePageSizes && Verbose) {
2667 tty->print_cr("Reserving large pages individually.");
2668 }
2669 char * p_buf;
2670 // first reserve enough address space in advance since we want to be
2671 // able to break a single contiguous virtual address range into multiple
2672 // large page commits but WS2003 does not allow reserving large page space
2673 // so we just use 4K pages for reserve, this gives us a legal contiguous
2674 // address space. then we will deallocate that reservation, and re alloc
2675 // using large pages
2676 const size_t size_of_reserve = bytes + _large_page_size;
2677 if (bytes > size_of_reserve) {
2678 // Overflowed.
2679 warning("Individually allocated large pages failed, "
2680 "use -XX:-UseLargePagesIndividualAllocation to turn off");
2681 return NULL;
2682 }
2683 p_buf = (char *) VirtualAlloc(addr,
2684 size_of_reserve, // size of Reserve
2685 MEM_RESERVE,
2686 PAGE_READWRITE);
2687 // If reservation failed, return NULL
2688 if (p_buf == NULL) return NULL;
2689
2690 release_memory(p_buf, bytes + _large_page_size);
2691 // round up to page boundary. If the size_of_reserve did not
2692 // overflow and the reservation did not fail, this align up
2693 // should not overflow.
2694 p_buf = (char *) align_size_up((size_t)p_buf, _large_page_size);
2695
2696 // now go through and allocate one page at a time until all bytes are
2697 // allocated
2698 size_t bytes_remaining = align_size_up(bytes, _large_page_size);
2699 // An overflow of align_size_up() would have been caught above
2700 // in the calculation of size_of_reserve.
2701 char * next_alloc_addr = p_buf;
2702
2703 #ifdef ASSERT
2704 // Variable for the failure injection
2705 long ran_num = os::random();
2706 size_t fail_after = ran_num % bytes;
2707 #endif
2708
2709 while (bytes_remaining) {
2710 size_t bytes_to_rq = MIN2(bytes_remaining, _large_page_size);
2711 // Note allocate and commit
2712 char * p_new;
2713
2714 #ifdef ASSERT
2715 bool inject_error = LargePagesIndividualAllocationInjectError &&
2716 (bytes_remaining <= fail_after);
2717 #else
2718 const bool inject_error = false;
2719 #endif
2720
2721 if (inject_error) {
2722 p_new = NULL;
2723 } else {
2724 p_new = (char *) VirtualAlloc(next_alloc_addr,
2725 bytes_to_rq,
2726 MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES,
2727 prot);
2728 }
2729
2730 if (p_new == NULL) {
2731 // Free any allocated pages
2732 if (next_alloc_addr > p_buf) {
2733 // Some memory was committed so release it.
2734 size_t bytes_to_release = bytes - bytes_remaining;
2735 release_memory(p_buf, bytes_to_release);
2736 }
2737 #ifdef ASSERT
2738 if (UseLargePagesIndividualAllocation &&
2739 LargePagesIndividualAllocationInjectError) {
2740 if (TracePageSizes && Verbose) {
2741 tty->print_cr("Reserving large pages individually failed.");
2742 }
2743 }
2744 #endif
2745 return NULL;
2746 }
2747 bytes_remaining -= bytes_to_rq;
2748 next_alloc_addr += bytes_to_rq;
2749 }
2750
2751 return p_buf;
2752
2753 } else {
2754 // normal policy just allocate it all at once
2755 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
2756 char * res = (char *)VirtualAlloc(NULL, bytes, flag, prot);
2757 return res;
2758 }
2759 }
2760
2761 bool os::release_memory_special(char* base, size_t bytes) {
2762 return release_memory(base, bytes);
2763 }
2764
2765 void os::print_statistics() {
2766 }
2767
2768 bool os::commit_memory(char* addr, size_t bytes, bool exec) {
2769 if (bytes == 0) {
2770 // Don't bother the OS with noops.
2771 return true;
2772 }
2773 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
2774 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
2775 // Don't attempt to print anything if the OS call fails. We're
2776 // probably low on resources, so the print itself may cause crashes.
2777 bool result = VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) != 0;
2778 if (result != NULL && exec) {
2779 DWORD oldprot;
2780 // Windows doc says to use VirtualProtect to get execute permissions
2781 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot) != 0;
2782 } else {
2783 return result;
2784 }
2785 }
2786
2787 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint,
2788 bool exec) {
2789 return commit_memory(addr, size, exec);
2790 }
2791
2792 bool os::uncommit_memory(char* addr, size_t bytes) {
2793 if (bytes == 0) {
2794 // Don't bother the OS with noops.
2795 return true;
2796 }
2797 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
2798 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
2799 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0;
2800 }
2801
2802 bool os::release_memory(char* addr, size_t bytes) {
2803 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
2804 }
2805
2806 // Set protections specified
2807 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2808 bool is_committed) {
2809 unsigned int p = 0;
2810 switch (prot) {
2811 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
2812 case MEM_PROT_READ: p = PAGE_READONLY; break;
2813 case MEM_PROT_RW: p = PAGE_READWRITE; break;
2814 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
2815 default:
2816 ShouldNotReachHere();
2817 }
2818
2819 DWORD old_status;
2820
2821 // Strange enough, but on Win32 one can change protection only for committed
2822 // memory, not a big deal anyway, as bytes less or equal than 64K
2823 if (!is_committed && !commit_memory(addr, bytes, prot == MEM_PROT_RWX)) {
2824 fatal("cannot commit protection page");
2825 }
2826 // One cannot use os::guard_memory() here, as on Win32 guard page
2827 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
2828 //
2829 // Pages in the region become guard pages. Any attempt to access a guard page
2830 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
2831 // the guard page status. Guard pages thus act as a one-time access alarm.
2832 return VirtualProtect(addr, bytes, p, &old_status) != 0;
2833 }
2834
2835 bool os::guard_memory(char* addr, size_t bytes) {
2836 DWORD old_status;
2837 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
2838 }
2839
2840 bool os::unguard_memory(char* addr, size_t bytes) {
2841 DWORD old_status;
2842 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
2843 }
2844
2845 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
2846 void os::free_memory(char *addr, size_t bytes) { }
2847 void os::numa_make_global(char *addr, size_t bytes) { }
2848 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
2849 bool os::numa_topology_changed() { return false; }
2850 size_t os::numa_get_groups_num() { return 1; }
2851 int os::numa_get_group_id() { return 0; }
2852 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2853 if (size > 0) {
2854 ids[0] = 0;
2855 return 1;
2856 }
2857 return 0;
2858 }
2859
2860 bool os::get_page_info(char *start, page_info* info) {
2861 return false;
2862 }
2863
2864 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2865 return end;
2866 }
2867
2868 char* os::non_memory_address_word() {
2869 // Must never look like an address returned by reserve_memory,
2870 // even in its subfields (as defined by the CPU immediate fields,
2871 // if the CPU splits constants across multiple instructions).
2872 return (char*)-1;
2873 }
2874
2875 #define MAX_ERROR_COUNT 100
2876 #define SYS_THREAD_ERROR 0xffffffffUL
2877
2878 void os::pd_start_thread(Thread* thread) {
2879 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
2880 // Returns previous suspend state:
2881 // 0: Thread was not suspended
2882 // 1: Thread is running now
2883 // >1: Thread is still suspended.
2884 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
2885 }
2886
2887 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2888 return ::read(fd, buf, nBytes);
2889 }
2890
2891 class HighResolutionInterval {
2892 // The default timer resolution seems to be 10 milliseconds.
2893 // (Where is this written down?)
2894 // If someone wants to sleep for only a fraction of the default,
2895 // then we set the timer resolution down to 1 millisecond for
2896 // the duration of their interval.
2897 // We carefully set the resolution back, since otherwise we
2898 // seem to incur an overhead (3%?) that we don't need.
2899 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
2900 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
2901 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
2902 // timeBeginPeriod() if the relative error exceeded some threshold.
2903 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
2904 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
2905 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
2906 // resolution timers running.
2907 private:
2908 jlong resolution;
2909 public:
2910 HighResolutionInterval(jlong ms) {
2911 resolution = ms % 10L;
2912 if (resolution != 0) {
2913 MMRESULT result = timeBeginPeriod(1L);
2914 }
2915 }
2916 ~HighResolutionInterval() {
2917 if (resolution != 0) {
2918 MMRESULT result = timeEndPeriod(1L);
2919 }
2920 resolution = 0L;
2921 }
2922 };
2923
2924 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
2925 jlong limit = (jlong) MAXDWORD;
2926
2927 while(ms > limit) {
2928 int res;
2929 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
2930 return res;
2931 ms -= limit;
2932 }
2933
2934 assert(thread == Thread::current(), "thread consistency check");
2935 OSThread* osthread = thread->osthread();
2936 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
2937 int result;
2938 if (interruptable) {
2939 assert(thread->is_Java_thread(), "must be java thread");
2940 JavaThread *jt = (JavaThread *) thread;
2941 ThreadBlockInVM tbivm(jt);
2942
2943 jt->set_suspend_equivalent();
2944 // cleared by handle_special_suspend_equivalent_condition() or
2945 // java_suspend_self() via check_and_wait_while_suspended()
2946
2947 HANDLE events[1];
2948 events[0] = osthread->interrupt_event();
2949 HighResolutionInterval *phri=NULL;
2950 if(!ForceTimeHighResolution)
2951 phri = new HighResolutionInterval( ms );
2952 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
2953 result = OS_TIMEOUT;
2954 } else {
2955 ResetEvent(osthread->interrupt_event());
2956 osthread->set_interrupted(false);
2957 result = OS_INTRPT;
2958 }
2959 delete phri; //if it is NULL, harmless
2960
2961 // were we externally suspended while we were waiting?
2962 jt->check_and_wait_while_suspended();
2963 } else {
2964 assert(!thread->is_Java_thread(), "must not be java thread");
2965 Sleep((long) ms);
2966 result = OS_TIMEOUT;
2967 }
2968 return result;
2969 }
2970
2971 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2972 void os::infinite_sleep() {
2973 while (true) { // sleep forever ...
2974 Sleep(100000); // ... 100 seconds at a time
2975 }
2976 }
2977
2978 typedef BOOL (WINAPI * STTSignature)(void) ;
2979
2980 os::YieldResult os::NakedYield() {
2981 // Use either SwitchToThread() or Sleep(0)
2982 // Consider passing back the return value from SwitchToThread().
2983 // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread.
2984 // In that case we revert to Sleep(0).
2985 static volatile STTSignature stt = (STTSignature) 1 ;
2986
2987 if (stt == ((STTSignature) 1)) {
2988 stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ;
2989 // It's OK if threads race during initialization as the operation above is idempotent.
2990 }
2991 if (stt != NULL) {
2992 return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
2993 } else {
2994 Sleep (0) ;
2995 }
2996 return os::YIELD_UNKNOWN ;
2997 }
2998
2999 void os::yield() { os::NakedYield(); }
3000
3001 void os::yield_all(int attempts) {
3002 // Yields to all threads, including threads with lower priorities
3003 Sleep(1);
3004 }
3005
3006 // Win32 only gives you access to seven real priorities at a time,
3007 // so we compress Java's ten down to seven. It would be better
3008 // if we dynamically adjusted relative priorities.
3009
3010 int os::java_to_os_priority[MaxPriority + 1] = {
3011 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3012 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3013 THREAD_PRIORITY_LOWEST, // 2
3014 THREAD_PRIORITY_BELOW_NORMAL, // 3
3015 THREAD_PRIORITY_BELOW_NORMAL, // 4
3016 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3017 THREAD_PRIORITY_NORMAL, // 6
3018 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3019 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3020 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3021 THREAD_PRIORITY_HIGHEST // 10 MaxPriority
3022 };
3023
3024 int prio_policy1[MaxPriority + 1] = {
3025 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3026 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3027 THREAD_PRIORITY_LOWEST, // 2
3028 THREAD_PRIORITY_BELOW_NORMAL, // 3
3029 THREAD_PRIORITY_BELOW_NORMAL, // 4
3030 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3031 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3032 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3033 THREAD_PRIORITY_HIGHEST, // 8
3034 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3035 THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority
3036 };
3037
3038 static int prio_init() {
3039 // If ThreadPriorityPolicy is 1, switch tables
3040 if (ThreadPriorityPolicy == 1) {
3041 int i;
3042 for (i = 0; i < MaxPriority + 1; i++) {
3043 os::java_to_os_priority[i] = prio_policy1[i];
3044 }
3045 }
3046 return 0;
3047 }
3048
3049 OSReturn os::set_native_priority(Thread* thread, int priority) {
3050 if (!UseThreadPriorities) return OS_OK;
3051 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3052 return ret ? OS_OK : OS_ERR;
3053 }
3054
3055 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3056 if ( !UseThreadPriorities ) {
3057 *priority_ptr = java_to_os_priority[NormPriority];
3058 return OS_OK;
3059 }
3060 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3061 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3062 assert(false, "GetThreadPriority failed");
3063 return OS_ERR;
3064 }
3065 *priority_ptr = os_prio;
3066 return OS_OK;
3067 }
3068
3069
3070 // Hint to the underlying OS that a task switch would not be good.
3071 // Void return because it's a hint and can fail.
3072 void os::hint_no_preempt() {}
3073
3074 void os::interrupt(Thread* thread) {
3075 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3076 "possibility of dangling Thread pointer");
3077
3078 OSThread* osthread = thread->osthread();
3079 osthread->set_interrupted(true);
3080 // More than one thread can get here with the same value of osthread,
3081 // resulting in multiple notifications. We do, however, want the store
3082 // to interrupted() to be visible to other threads before we post
3083 // the interrupt event.
3084 OrderAccess::release();
3085 SetEvent(osthread->interrupt_event());
3086 // For JSR166: unpark after setting status
3087 if (thread->is_Java_thread())
3088 ((JavaThread*)thread)->parker()->unpark();
3089
3090 ParkEvent * ev = thread->_ParkEvent ;
3091 if (ev != NULL) ev->unpark() ;
3092
3093 }
3094
3095
3096 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3097 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3098 "possibility of dangling Thread pointer");
3099
3100 OSThread* osthread = thread->osthread();
3101 bool interrupted;
3102 interrupted = osthread->interrupted();
3103 if (clear_interrupted == true) {
3104 osthread->set_interrupted(false);
3105 ResetEvent(osthread->interrupt_event());
3106 } // Otherwise leave the interrupted state alone
3107
3108 return interrupted;
3109 }
3110
3111 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3112 ExtendedPC os::get_thread_pc(Thread* thread) {
3113 CONTEXT context;
3114 context.ContextFlags = CONTEXT_CONTROL;
3115 HANDLE handle = thread->osthread()->thread_handle();
3116 #ifdef _M_IA64
3117 assert(0, "Fix get_thread_pc");
3118 return ExtendedPC(NULL);
3119 #else
3120 if (GetThreadContext(handle, &context)) {
3121 #ifdef _M_AMD64
3122 return ExtendedPC((address) context.Rip);
3123 #else
3124 return ExtendedPC((address) context.Eip);
3125 #endif
3126 } else {
3127 return ExtendedPC(NULL);
3128 }
3129 #endif
3130 }
3131
3132 // GetCurrentThreadId() returns DWORD
3133 intx os::current_thread_id() { return GetCurrentThreadId(); }
3134
3135 static int _initial_pid = 0;
3136
3137 int os::current_process_id()
3138 {
3139 return (_initial_pid ? _initial_pid : _getpid());
3140 }
3141
3142 int os::win32::_vm_page_size = 0;
3143 int os::win32::_vm_allocation_granularity = 0;
3144 int os::win32::_processor_type = 0;
3145 // Processor level is not available on non-NT systems, use vm_version instead
3146 int os::win32::_processor_level = 0;
3147 julong os::win32::_physical_memory = 0;
3148 size_t os::win32::_default_stack_size = 0;
3149
3150 intx os::win32::_os_thread_limit = 0;
3151 volatile intx os::win32::_os_thread_count = 0;
3152
3153 bool os::win32::_is_nt = false;
3154 bool os::win32::_is_windows_2003 = false;
3155
3156
3157 void os::win32::initialize_system_info() {
3158 SYSTEM_INFO si;
3159 GetSystemInfo(&si);
3160 _vm_page_size = si.dwPageSize;
3161 _vm_allocation_granularity = si.dwAllocationGranularity;
3162 _processor_type = si.dwProcessorType;
3163 _processor_level = si.wProcessorLevel;
3164 set_processor_count(si.dwNumberOfProcessors);
3165
3166 MEMORYSTATUSEX ms;
3167 ms.dwLength = sizeof(ms);
3168
3169 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3170 // dwMemoryLoad (% of memory in use)
3171 GlobalMemoryStatusEx(&ms);
3172 _physical_memory = ms.ullTotalPhys;
3173
3174 OSVERSIONINFO oi;
3175 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
3176 GetVersionEx(&oi);
3177 switch(oi.dwPlatformId) {
3178 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3179 case VER_PLATFORM_WIN32_NT:
3180 _is_nt = true;
3181 {
3182 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3183 if (os_vers == 5002) {
3184 _is_windows_2003 = true;
3185 }
3186 }
3187 break;
3188 default: fatal("Unknown platform");
3189 }
3190
3191 _default_stack_size = os::current_stack_size();
3192 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3193 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3194 "stack size not a multiple of page size");
3195
3196 initialize_performance_counter();
3197
3198 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3199 // known to deadlock the system, if the VM issues to thread operations with
3200 // a too high frequency, e.g., such as changing the priorities.
3201 // The 6000 seems to work well - no deadlocks has been notices on the test
3202 // programs that we have seen experience this problem.
3203 if (!os::win32::is_nt()) {
3204 StarvationMonitorInterval = 6000;
3205 }
3206 }
3207
3208
3209 void os::win32::setmode_streams() {
3210 _setmode(_fileno(stdin), _O_BINARY);
3211 _setmode(_fileno(stdout), _O_BINARY);
3212 _setmode(_fileno(stderr), _O_BINARY);
3213 }
3214
3215
3216 int os::message_box(const char* title, const char* message) {
3217 int result = MessageBox(NULL, message, title,
3218 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3219 return result == IDYES;
3220 }
3221
3222 int os::allocate_thread_local_storage() {
3223 return TlsAlloc();
3224 }
3225
3226
3227 void os::free_thread_local_storage(int index) {
3228 TlsFree(index);
3229 }
3230
3231
3232 void os::thread_local_storage_at_put(int index, void* value) {
3233 TlsSetValue(index, value);
3234 assert(thread_local_storage_at(index) == value, "Just checking");
3235 }
3236
3237
3238 void* os::thread_local_storage_at(int index) {
3239 return TlsGetValue(index);
3240 }
3241
3242
3243 #ifndef PRODUCT
3244 #ifndef _WIN64
3245 // Helpers to check whether NX protection is enabled
3246 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3247 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3248 pex->ExceptionRecord->NumberParameters > 0 &&
3249 pex->ExceptionRecord->ExceptionInformation[0] ==
3250 EXCEPTION_INFO_EXEC_VIOLATION) {
3251 return EXCEPTION_EXECUTE_HANDLER;
3252 }
3253 return EXCEPTION_CONTINUE_SEARCH;
3254 }
3255
3256 void nx_check_protection() {
3257 // If NX is enabled we'll get an exception calling into code on the stack
3258 char code[] = { (char)0xC3 }; // ret
3259 void *code_ptr = (void *)code;
3260 __try {
3261 __asm call code_ptr
3262 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3263 tty->print_raw_cr("NX protection detected.");
3264 }
3265 }
3266 #endif // _WIN64
3267 #endif // PRODUCT
3268
3269 // this is called _before_ the global arguments have been parsed
3270 void os::init(void) {
3271 _initial_pid = _getpid();
3272
3273 init_random(1234567);
3274
3275 win32::initialize_system_info();
3276 win32::setmode_streams();
3277 init_page_sizes((size_t) win32::vm_page_size());
3278
3279 // For better scalability on MP systems (must be called after initialize_system_info)
3280 #ifndef PRODUCT
3281 if (is_MP()) {
3282 NoYieldsInMicrolock = true;
3283 }
3284 #endif
3285 // This may be overridden later when argument processing is done.
3286 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3287 os::win32::is_windows_2003());
3288
3289 // Initialize main_process and main_thread
3290 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3291 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3292 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3293 fatal("DuplicateHandle failed\n");
3294 }
3295 main_thread_id = (int) GetCurrentThreadId();
3296 }
3297
3298 // To install functions for atexit processing
3299 extern "C" {
3300 static void perfMemory_exit_helper() {
3301 perfMemory_exit();
3302 }
3303 }
3304
3305
3306 // this is called _after_ the global arguments have been parsed
3307 jint os::init_2(void) {
3308 // Allocate a single page and mark it as readable for safepoint polling
3309 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3310 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3311
3312 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3313 guarantee( return_page != NULL, "Commit Failed for polling page");
3314
3315 os::set_polling_page( polling_page );
3316
3317 #ifndef PRODUCT
3318 if( Verbose && PrintMiscellaneous )
3319 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3320 #endif
3321
3322 if (!UseMembar) {
3323 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3324 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3325
3326 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3327 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3328
3329 os::set_memory_serialize_page( mem_serialize_page );
3330
3331 #ifndef PRODUCT
3332 if(Verbose && PrintMiscellaneous)
3333 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3334 #endif
3335 }
3336
3337 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init());
3338
3339 // Setup Windows Exceptions
3340
3341 // On Itanium systems, Structured Exception Handling does not
3342 // work since stack frames must be walkable by the OS. Since
3343 // much of our code is dynamically generated, and we do not have
3344 // proper unwind .xdata sections, the system simply exits
3345 // rather than delivering the exception. To work around
3346 // this we use VectorExceptions instead.
3347 #ifdef _WIN64
3348 if (UseVectoredExceptions) {
3349 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter);
3350 }
3351 #endif
3352
3353 // for debugging float code generation bugs
3354 if (ForceFloatExceptions) {
3355 #ifndef _WIN64
3356 static long fp_control_word = 0;
3357 __asm { fstcw fp_control_word }
3358 // see Intel PPro Manual, Vol. 2, p 7-16
3359 const long precision = 0x20;
3360 const long underflow = 0x10;
3361 const long overflow = 0x08;
3362 const long zero_div = 0x04;
3363 const long denorm = 0x02;
3364 const long invalid = 0x01;
3365 fp_control_word |= invalid;
3366 __asm { fldcw fp_control_word }
3367 #endif
3368 }
3369
3370 // Initialize HPI.
3371 jint hpi_result = hpi::initialize();
3372 if (hpi_result != JNI_OK) { return hpi_result; }
3373
3374 // If stack_commit_size is 0, windows will reserve the default size,
3375 // but only commit a small portion of it.
3376 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3377 size_t default_reserve_size = os::win32::default_stack_size();
3378 size_t actual_reserve_size = stack_commit_size;
3379 if (stack_commit_size < default_reserve_size) {
3380 // If stack_commit_size == 0, we want this too
3381 actual_reserve_size = default_reserve_size;
3382 }
3383
3384 JavaThread::set_stack_size_at_create(stack_commit_size);
3385
3386 // Calculate theoretical max. size of Threads to guard gainst artifical
3387 // out-of-memory situations, where all available address-space has been
3388 // reserved by thread stacks.
3389 assert(actual_reserve_size != 0, "Must have a stack");
3390
3391 // Calculate the thread limit when we should start doing Virtual Memory
3392 // banging. Currently when the threads will have used all but 200Mb of space.
3393 //
3394 // TODO: consider performing a similar calculation for commit size instead
3395 // as reserve size, since on a 64-bit platform we'll run into that more
3396 // often than running out of virtual memory space. We can use the
3397 // lower value of the two calculations as the os_thread_limit.
3398 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3399 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3400
3401 // at exit methods are called in the reverse order of their registration.
3402 // there is no limit to the number of functions registered. atexit does
3403 // not set errno.
3404
3405 if (PerfAllowAtExitRegistration) {
3406 // only register atexit functions if PerfAllowAtExitRegistration is set.
3407 // atexit functions can be delayed until process exit time, which
3408 // can be problematic for embedded VM situations. Embedded VMs should
3409 // call DestroyJavaVM() to assure that VM resources are released.
3410
3411 // note: perfMemory_exit_helper atexit function may be removed in
3412 // the future if the appropriate cleanup code can be added to the
3413 // VM_Exit VMOperation's doit method.
3414 if (atexit(perfMemory_exit_helper) != 0) {
3415 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3416 }
3417 }
3418
3419 // initialize PSAPI or ToolHelp for fatal error handler
3420 if (win32::is_nt()) _init_psapi();
3421 else _init_toolhelp();
3422
3423 #ifndef _WIN64
3424 // Print something if NX is enabled (win32 on AMD64)
3425 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
3426 #endif
3427
3428 // initialize thread priority policy
3429 prio_init();
3430
3431 if (UseNUMA && !ForceNUMA) {
3432 UseNUMA = false; // Currently unsupported.
3433 }
3434
3435 return JNI_OK;
3436 }
3437
3438
3439 // Mark the polling page as unreadable
3440 void os::make_polling_page_unreadable(void) {
3441 DWORD old_status;
3442 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
3443 fatal("Could not disable polling page");
3444 };
3445
3446 // Mark the polling page as readable
3447 void os::make_polling_page_readable(void) {
3448 DWORD old_status;
3449 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
3450 fatal("Could not enable polling page");
3451 };
3452
3453
3454 int os::stat(const char *path, struct stat *sbuf) {
3455 char pathbuf[MAX_PATH];
3456 if (strlen(path) > MAX_PATH - 1) {
3457 errno = ENAMETOOLONG;
3458 return -1;
3459 }
3460 hpi::native_path(strcpy(pathbuf, path));
3461 int ret = ::stat(pathbuf, sbuf);
3462 if (sbuf != NULL && UseUTCFileTimestamp) {
3463 // Fix for 6539723. st_mtime returned from stat() is dependent on
3464 // the system timezone and so can return different values for the
3465 // same file if/when daylight savings time changes. This adjustment
3466 // makes sure the same timestamp is returned regardless of the TZ.
3467 //
3468 // See:
3469 // http://msdn.microsoft.com/library/
3470 // default.asp?url=/library/en-us/sysinfo/base/
3471 // time_zone_information_str.asp
3472 // and
3473 // http://msdn.microsoft.com/library/default.asp?url=
3474 // /library/en-us/sysinfo/base/settimezoneinformation.asp
3475 //
3476 // NOTE: there is a insidious bug here: If the timezone is changed
3477 // after the call to stat() but before 'GetTimeZoneInformation()', then
3478 // the adjustment we do here will be wrong and we'll return the wrong
3479 // value (which will likely end up creating an invalid class data
3480 // archive). Absent a better API for this, or some time zone locking
3481 // mechanism, we'll have to live with this risk.
3482 TIME_ZONE_INFORMATION tz;
3483 DWORD tzid = GetTimeZoneInformation(&tz);
3484 int daylightBias =
3485 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
3486 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
3487 }
3488 return ret;
3489 }
3490
3491
3492 #define FT2INT64(ft) \
3493 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
3494
3495
3496 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3497 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3498 // of a thread.
3499 //
3500 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3501 // the fast estimate available on the platform.
3502
3503 // current_thread_cpu_time() is not optimized for Windows yet
3504 jlong os::current_thread_cpu_time() {
3505 // return user + sys since the cost is the same
3506 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
3507 }
3508
3509 jlong os::thread_cpu_time(Thread* thread) {
3510 // consistent with what current_thread_cpu_time() returns.
3511 return os::thread_cpu_time(thread, true /* user+sys */);
3512 }
3513
3514 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3515 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3516 }
3517
3518 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
3519 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
3520 // If this function changes, os::is_thread_cpu_time_supported() should too
3521 if (os::win32::is_nt()) {
3522 FILETIME CreationTime;
3523 FILETIME ExitTime;
3524 FILETIME KernelTime;
3525 FILETIME UserTime;
3526
3527 if ( GetThreadTimes(thread->osthread()->thread_handle(),
3528 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3529 return -1;
3530 else
3531 if (user_sys_cpu_time) {
3532 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
3533 } else {
3534 return FT2INT64(UserTime) * 100;
3535 }
3536 } else {
3537 return (jlong) timeGetTime() * 1000000;
3538 }
3539 }
3540
3541 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3542 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3543 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3544 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3545 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3546 }
3547
3548 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3549 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3550 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3551 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3552 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3553 }
3554
3555 bool os::is_thread_cpu_time_supported() {
3556 // see os::thread_cpu_time
3557 if (os::win32::is_nt()) {
3558 FILETIME CreationTime;
3559 FILETIME ExitTime;
3560 FILETIME KernelTime;
3561 FILETIME UserTime;
3562
3563 if ( GetThreadTimes(GetCurrentThread(),
3564 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3565 return false;
3566 else
3567 return true;
3568 } else {
3569 return false;
3570 }
3571 }
3572
3573 // Windows does't provide a loadavg primitive so this is stubbed out for now.
3574 // It does have primitives (PDH API) to get CPU usage and run queue length.
3575 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
3576 // If we wanted to implement loadavg on Windows, we have a few options:
3577 //
3578 // a) Query CPU usage and run queue length and "fake" an answer by
3579 // returning the CPU usage if it's under 100%, and the run queue
3580 // length otherwise. It turns out that querying is pretty slow
3581 // on Windows, on the order of 200 microseconds on a fast machine.
3582 // Note that on the Windows the CPU usage value is the % usage
3583 // since the last time the API was called (and the first call
3584 // returns 100%), so we'd have to deal with that as well.
3585 //
3586 // b) Sample the "fake" answer using a sampling thread and store
3587 // the answer in a global variable. The call to loadavg would
3588 // just return the value of the global, avoiding the slow query.
3589 //
3590 // c) Sample a better answer using exponential decay to smooth the
3591 // value. This is basically the algorithm used by UNIX kernels.
3592 //
3593 // Note that sampling thread starvation could affect both (b) and (c).
3594 int os::loadavg(double loadavg[], int nelem) {
3595 return -1;
3596 }
3597
3598
3599 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
3600 bool os::dont_yield() {
3601 return DontYieldALot;
3602 }
3603
3604 // Is a (classpath) directory empty?
3605 bool os::dir_is_empty(const char* path) {
3606 WIN32_FIND_DATA fd;
3607 HANDLE f = FindFirstFile(path, &fd);
3608 if (f == INVALID_HANDLE_VALUE) {
3609 return true;
3610 }
3611 FindClose(f);
3612 return false;
3613 }
3614
3615 // create binary file, rewriting existing file if required
3616 int os::create_binary_file(const char* path, bool rewrite_existing) {
3617 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
3618 if (!rewrite_existing) {
3619 oflags |= _O_EXCL;
3620 }
3621 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
3622 }
3623
3624 // return current position of file pointer
3625 jlong os::current_file_offset(int fd) {
3626 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
3627 }
3628
3629 // move file pointer to the specified offset
3630 jlong os::seek_to_file_offset(int fd, jlong offset) {
3631 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
3632 }
3633
3634
3635 // Map a block of memory.
3636 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
3637 char *addr, size_t bytes, bool read_only,
3638 bool allow_exec) {
3639 HANDLE hFile;
3640 char* base;
3641
3642 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
3643 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
3644 if (hFile == NULL) {
3645 if (PrintMiscellaneous && Verbose) {
3646 DWORD err = GetLastError();
3647 tty->print_cr("CreateFile() failed: GetLastError->%ld.");
3648 }
3649 return NULL;
3650 }
3651
3652 if (allow_exec) {
3653 // CreateFileMapping/MapViewOfFileEx can't map executable memory
3654 // unless it comes from a PE image (which the shared archive is not.)
3655 // Even VirtualProtect refuses to give execute access to mapped memory
3656 // that was not previously executable.
3657 //
3658 // Instead, stick the executable region in anonymous memory. Yuck.
3659 // Penalty is that ~4 pages will not be shareable - in the future
3660 // we might consider DLLizing the shared archive with a proper PE
3661 // header so that mapping executable + sharing is possible.
3662
3663 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
3664 PAGE_READWRITE);
3665 if (base == NULL) {
3666 if (PrintMiscellaneous && Verbose) {
3667 DWORD err = GetLastError();
3668 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
3669 }
3670 CloseHandle(hFile);
3671 return NULL;
3672 }
3673
3674 DWORD bytes_read;
3675 OVERLAPPED overlapped;
3676 overlapped.Offset = (DWORD)file_offset;
3677 overlapped.OffsetHigh = 0;
3678 overlapped.hEvent = NULL;
3679 // ReadFile guarantees that if the return value is true, the requested
3680 // number of bytes were read before returning.
3681 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
3682 if (!res) {
3683 if (PrintMiscellaneous && Verbose) {
3684 DWORD err = GetLastError();
3685 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
3686 }
3687 release_memory(base, bytes);
3688 CloseHandle(hFile);
3689 return NULL;
3690 }
3691 } else {
3692 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
3693 NULL /*file_name*/);
3694 if (hMap == NULL) {
3695 if (PrintMiscellaneous && Verbose) {
3696 DWORD err = GetLastError();
3697 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.");
3698 }
3699 CloseHandle(hFile);
3700 return NULL;
3701 }
3702
3703 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
3704 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
3705 (DWORD)bytes, addr);
3706 if (base == NULL) {
3707 if (PrintMiscellaneous && Verbose) {
3708 DWORD err = GetLastError();
3709 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
3710 }
3711 CloseHandle(hMap);
3712 CloseHandle(hFile);
3713 return NULL;
3714 }
3715
3716 if (CloseHandle(hMap) == 0) {
3717 if (PrintMiscellaneous && Verbose) {
3718 DWORD err = GetLastError();
3719 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
3720 }
3721 CloseHandle(hFile);
3722 return base;
3723 }
3724 }
3725
3726 if (allow_exec) {
3727 DWORD old_protect;
3728 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
3729 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
3730
3731 if (!res) {
3732 if (PrintMiscellaneous && Verbose) {
3733 DWORD err = GetLastError();
3734 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
3735 }
3736 // Don't consider this a hard error, on IA32 even if the
3737 // VirtualProtect fails, we should still be able to execute
3738 CloseHandle(hFile);
3739 return base;
3740 }
3741 }
3742
3743 if (CloseHandle(hFile) == 0) {
3744 if (PrintMiscellaneous && Verbose) {
3745 DWORD err = GetLastError();
3746 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
3747 }
3748 return base;
3749 }
3750
3751 return base;
3752 }
3753
3754
3755 // Remap a block of memory.
3756 char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
3757 char *addr, size_t bytes, bool read_only,
3758 bool allow_exec) {
3759 // This OS does not allow existing memory maps to be remapped so we
3760 // have to unmap the memory before we remap it.
3761 if (!os::unmap_memory(addr, bytes)) {
3762 return NULL;
3763 }
3764
3765 // There is a very small theoretical window between the unmap_memory()
3766 // call above and the map_memory() call below where a thread in native
3767 // code may be able to access an address that is no longer mapped.
3768
3769 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3770 allow_exec);
3771 }
3772
3773
3774 // Unmap a block of memory.
3775 // Returns true=success, otherwise false.
3776
3777 bool os::unmap_memory(char* addr, size_t bytes) {
3778 BOOL result = UnmapViewOfFile(addr);
3779 if (result == 0) {
3780 if (PrintMiscellaneous && Verbose) {
3781 DWORD err = GetLastError();
3782 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
3783 }
3784 return false;
3785 }
3786 return true;
3787 }
3788
3789 void os::pause() {
3790 char filename[MAX_PATH];
3791 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3792 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
3793 } else {
3794 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3795 }
3796
3797 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3798 if (fd != -1) {
3799 struct stat buf;
3800 close(fd);
3801 while (::stat(filename, &buf) == 0) {
3802 Sleep(100);
3803 }
3804 } else {
3805 jio_fprintf(stderr,
3806 "Could not open pause file '%s', continuing immediately.\n", filename);
3807 }
3808 }
3809
3810 // An Event wraps a win32 "CreateEvent" kernel handle.
3811 //
3812 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
3813 //
3814 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
3815 // field, and call CloseHandle() on the win32 event handle. Unpark() would
3816 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
3817 // In addition, an unpark() operation might fetch the handle field, but the
3818 // event could recycle between the fetch and the SetEvent() operation.
3819 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
3820 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
3821 // on an stale but recycled handle would be harmless, but in practice this might
3822 // confuse other non-Sun code, so it's not a viable approach.
3823 //
3824 // 2: Once a win32 event handle is associated with an Event, it remains associated
3825 // with the Event. The event handle is never closed. This could be construed
3826 // as handle leakage, but only up to the maximum # of threads that have been extant
3827 // at any one time. This shouldn't be an issue, as windows platforms typically
3828 // permit a process to have hundreds of thousands of open handles.
3829 //
3830 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
3831 // and release unused handles.
3832 //
3833 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
3834 // It's not clear, however, that we wouldn't be trading one type of leak for another.
3835 //
3836 // 5. Use an RCU-like mechanism (Read-Copy Update).
3837 // Or perhaps something similar to Maged Michael's "Hazard pointers".
3838 //
3839 // We use (2).
3840 //
3841 // TODO-FIXME:
3842 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
3843 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
3844 // to recover from (or at least detect) the dreaded Windows 841176 bug.
3845 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
3846 // into a single win32 CreateEvent() handle.
3847 //
3848 // _Event transitions in park()
3849 // -1 => -1 : illegal
3850 // 1 => 0 : pass - return immediately
3851 // 0 => -1 : block
3852 //
3853 // _Event serves as a restricted-range semaphore :
3854 // -1 : thread is blocked
3855 // 0 : neutral - thread is running or ready
3856 // 1 : signaled - thread is running or ready
3857 //
3858 // Another possible encoding of _Event would be
3859 // with explicit "PARKED" and "SIGNALED" bits.
3860
3861 int os::PlatformEvent::park (jlong Millis) {
3862 guarantee (_ParkHandle != NULL , "Invariant") ;
3863 guarantee (Millis > 0 , "Invariant") ;
3864 int v ;
3865
3866 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
3867 // the initial park() operation.
3868
3869 for (;;) {
3870 v = _Event ;
3871 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
3872 }
3873 guarantee ((v == 0) || (v == 1), "invariant") ;
3874 if (v != 0) return OS_OK ;
3875
3876 // Do this the hard way by blocking ...
3877 // TODO: consider a brief spin here, gated on the success of recent
3878 // spin attempts by this thread.
3879 //
3880 // We decompose long timeouts into series of shorter timed waits.
3881 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
3882 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
3883 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
3884 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
3885 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
3886 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
3887 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
3888 // for the already waited time. This policy does not admit any new outcomes.
3889 // In the future, however, we might want to track the accumulated wait time and
3890 // adjust Millis accordingly if we encounter a spurious wakeup.
3891
3892 const int MAXTIMEOUT = 0x10000000 ;
3893 DWORD rv = WAIT_TIMEOUT ;
3894 while (_Event < 0 && Millis > 0) {
3895 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
3896 if (Millis > MAXTIMEOUT) {
3897 prd = MAXTIMEOUT ;
3898 }
3899 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
3900 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
3901 if (rv == WAIT_TIMEOUT) {
3902 Millis -= prd ;
3903 }
3904 }
3905 v = _Event ;
3906 _Event = 0 ;
3907 OrderAccess::fence() ;
3908 // If we encounter a nearly simultanous timeout expiry and unpark()
3909 // we return OS_OK indicating we awoke via unpark().
3910 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
3911 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
3912 }
3913
3914 void os::PlatformEvent::park () {
3915 guarantee (_ParkHandle != NULL, "Invariant") ;
3916 // Invariant: Only the thread associated with the Event/PlatformEvent
3917 // may call park().
3918 int v ;
3919 for (;;) {
3920 v = _Event ;
3921 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
3922 }
3923 guarantee ((v == 0) || (v == 1), "invariant") ;
3924 if (v != 0) return ;
3925
3926 // Do this the hard way by blocking ...
3927 // TODO: consider a brief spin here, gated on the success of recent
3928 // spin attempts by this thread.
3929 while (_Event < 0) {
3930 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
3931 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
3932 }
3933
3934 // Usually we'll find _Event == 0 at this point, but as
3935 // an optional optimization we clear it, just in case can
3936 // multiple unpark() operations drove _Event up to 1.
3937 _Event = 0 ;
3938 OrderAccess::fence() ;
3939 guarantee (_Event >= 0, "invariant") ;
3940 }
3941
3942 void os::PlatformEvent::unpark() {
3943 guarantee (_ParkHandle != NULL, "Invariant") ;
3944 int v ;
3945 for (;;) {
3946 v = _Event ; // Increment _Event if it's < 1.
3947 if (v > 0) {
3948 // If it's already signaled just return.
3949 // The LD of _Event could have reordered or be satisfied
3950 // by a read-aside from this processor's write buffer.
3951 // To avoid problems execute a barrier and then
3952 // ratify the value. A degenerate CAS() would also work.
3953 // Viz., CAS (v+0, &_Event, v) == v).
3954 OrderAccess::fence() ;
3955 if (_Event == v) return ;
3956 continue ;
3957 }
3958 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
3959 }
3960 if (v < 0) {
3961 ::SetEvent (_ParkHandle) ;
3962 }
3963 }
3964
3965
3966 // JSR166
3967 // -------------------------------------------------------
3968
3969 /*
3970 * The Windows implementation of Park is very straightforward: Basic
3971 * operations on Win32 Events turn out to have the right semantics to
3972 * use them directly. We opportunistically resuse the event inherited
3973 * from Monitor.
3974 */
3975
3976
3977 void Parker::park(bool isAbsolute, jlong time) {
3978 guarantee (_ParkEvent != NULL, "invariant") ;
3979 // First, demultiplex/decode time arguments
3980 if (time < 0) { // don't wait
3981 return;
3982 }
3983 else if (time == 0) {
3984 time = INFINITE;
3985 }
3986 else if (isAbsolute) {
3987 time -= os::javaTimeMillis(); // convert to relative time
3988 if (time <= 0) // already elapsed
3989 return;
3990 }
3991 else { // relative
3992 time /= 1000000; // Must coarsen from nanos to millis
3993 if (time == 0) // Wait for the minimal time unit if zero
3994 time = 1;
3995 }
3996
3997 JavaThread* thread = (JavaThread*)(Thread::current());
3998 assert(thread->is_Java_thread(), "Must be JavaThread");
3999 JavaThread *jt = (JavaThread *)thread;
4000
4001 // Don't wait if interrupted or already triggered
4002 if (Thread::is_interrupted(thread, false) ||
4003 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4004 ResetEvent(_ParkEvent);
4005 return;
4006 }
4007 else {
4008 ThreadBlockInVM tbivm(jt);
4009 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4010 jt->set_suspend_equivalent();
4011
4012 WaitForSingleObject(_ParkEvent, time);
4013 ResetEvent(_ParkEvent);
4014
4015 // If externally suspended while waiting, re-suspend
4016 if (jt->handle_special_suspend_equivalent_condition()) {
4017 jt->java_suspend_self();
4018 }
4019 }
4020 }
4021
4022 void Parker::unpark() {
4023 guarantee (_ParkEvent != NULL, "invariant") ;
4024 SetEvent(_ParkEvent);
4025 }
4026
4027 // Run the specified command in a separate process. Return its exit value,
4028 // or -1 on failure (e.g. can't create a new process).
4029 int os::fork_and_exec(char* cmd) {
4030 STARTUPINFO si;
4031 PROCESS_INFORMATION pi;
4032
4033 memset(&si, 0, sizeof(si));
4034 si.cb = sizeof(si);
4035 memset(&pi, 0, sizeof(pi));
4036 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4037 cmd, // command line
4038 NULL, // process security attribute
4039 NULL, // thread security attribute
4040 TRUE, // inherits system handles
4041 0, // no creation flags
4042 NULL, // use parent's environment block
4043 NULL, // use parent's starting directory
4044 &si, // (in) startup information
4045 &pi); // (out) process information
4046
4047 if (rslt) {
4048 // Wait until child process exits.
4049 WaitForSingleObject(pi.hProcess, INFINITE);
4050
4051 DWORD exit_code;
4052 GetExitCodeProcess(pi.hProcess, &exit_code);
4053
4054 // Close process and thread handles.
4055 CloseHandle(pi.hProcess);
4056 CloseHandle(pi.hThread);
4057
4058 return (int)exit_code;
4059 } else {
4060 return -1;
4061 }
4062 }
4063
4064 //--------------------------------------------------------------------------------------------------
4065 // Non-product code
4066
4067 static int mallocDebugIntervalCounter = 0;
4068 static int mallocDebugCounter = 0;
4069 bool os::check_heap(bool force) {
4070 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
4071 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
4072 // Note: HeapValidate executes two hardware breakpoints when it finds something
4073 // wrong; at these points, eax contains the address of the offending block (I think).
4074 // To get to the exlicit error message(s) below, just continue twice.
4075 HANDLE heap = GetProcessHeap();
4076 { HeapLock(heap);
4077 PROCESS_HEAP_ENTRY phe;
4078 phe.lpData = NULL;
4079 while (HeapWalk(heap, &phe) != 0) {
4080 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
4081 !HeapValidate(heap, 0, phe.lpData)) {
4082 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
4083 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
4084 fatal("corrupted C heap");
4085 }
4086 }
4087 int err = GetLastError();
4088 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
4089 fatal1("heap walk aborted with error %d", err);
4090 }
4091 HeapUnlock(heap);
4092 }
4093 mallocDebugIntervalCounter = 0;
4094 }
4095 return true;
4096 }
4097
4098
4099 #ifndef PRODUCT
4100 bool os::find(address addr) {
4101 // Nothing yet
4102 return false;
4103 }
4104 #endif
4105
4106 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
4107 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
4108
4109 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
4110 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
4111 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
4112 address addr = (address) exceptionRecord->ExceptionInformation[1];
4113
4114 if (os::is_memory_serialize_page(thread, addr))
4115 return EXCEPTION_CONTINUE_EXECUTION;
4116 }
4117
4118 return EXCEPTION_CONTINUE_SEARCH;
4119 }
4120
4121 static int getLastErrorString(char *buf, size_t len)
4122 {
4123 long errval;
4124
4125 if ((errval = GetLastError()) != 0)
4126 {
4127 /* DOS error */
4128 size_t n = (size_t)FormatMessage(
4129 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
4130 NULL,
4131 errval,
4132 0,
4133 buf,
4134 (DWORD)len,
4135 NULL);
4136 if (n > 3) {
4137 /* Drop final '.', CR, LF */
4138 if (buf[n - 1] == '\n') n--;
4139 if (buf[n - 1] == '\r') n--;
4140 if (buf[n - 1] == '.') n--;
4141 buf[n] = '\0';
4142 }
4143 return (int)n;
4144 }
4145
4146 if (errno != 0)
4147 {
4148 /* C runtime error that has no corresponding DOS error code */
4149 const char *s = strerror(errno);
4150 size_t n = strlen(s);
4151 if (n >= len) n = len - 1;
4152 strncpy(buf, s, n);
4153 buf[n] = '\0';
4154 return (int)n;
4155 }
4156 return 0;
4157 }