1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifdef _WIN64
26 // Must be at least Windows 2000 or XP to use VectoredExceptions
27 #define _WIN32_WINNT 0x500
28 #endif
29
30 // 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 fatal(err_msg("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 // Check for abort hook
861 abort_hook_t abort_hook = Arguments::abort_hook();
862 if (abort_hook != NULL) {
863 abort_hook();
864 }
865 }
866
867 void os::abort(bool dump_core)
868 {
869 os::shutdown();
870 // no core dump on Windows
871 ::exit(1);
872 }
873
874 // Die immediately, no exit hook, no abort hook, no cleanup.
875 void os::die() {
876 _exit(-1);
877 }
878
879 // Directory routines copied from src/win32/native/java/io/dirent_md.c
880 // * dirent_md.c 1.15 00/02/02
881 //
882 // The declarations for DIR and struct dirent are in jvm_win32.h.
883
884 /* Caller must have already run dirname through JVM_NativePath, which removes
885 duplicate slashes and converts all instances of '/' into '\\'. */
886
887 DIR *
888 os::opendir(const char *dirname)
889 {
890 assert(dirname != NULL, "just checking"); // hotspot change
891 DIR *dirp = (DIR *)malloc(sizeof(DIR));
892 DWORD fattr; // hotspot change
893 char alt_dirname[4] = { 0, 0, 0, 0 };
894
895 if (dirp == 0) {
896 errno = ENOMEM;
897 return 0;
898 }
899
900 /*
901 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
902 * as a directory in FindFirstFile(). We detect this case here and
903 * prepend the current drive name.
904 */
905 if (dirname[1] == '\0' && dirname[0] == '\\') {
906 alt_dirname[0] = _getdrive() + 'A' - 1;
907 alt_dirname[1] = ':';
908 alt_dirname[2] = '\\';
909 alt_dirname[3] = '\0';
910 dirname = alt_dirname;
911 }
912
913 dirp->path = (char *)malloc(strlen(dirname) + 5);
914 if (dirp->path == 0) {
915 free(dirp);
916 errno = ENOMEM;
917 return 0;
918 }
919 strcpy(dirp->path, dirname);
920
921 fattr = GetFileAttributes(dirp->path);
922 if (fattr == 0xffffffff) {
923 free(dirp->path);
924 free(dirp);
925 errno = ENOENT;
926 return 0;
927 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
928 free(dirp->path);
929 free(dirp);
930 errno = ENOTDIR;
931 return 0;
932 }
933
934 /* Append "*.*", or possibly "\\*.*", to path */
935 if (dirp->path[1] == ':'
936 && (dirp->path[2] == '\0'
937 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
938 /* No '\\' needed for cases like "Z:" or "Z:\" */
939 strcat(dirp->path, "*.*");
940 } else {
941 strcat(dirp->path, "\\*.*");
942 }
943
944 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
945 if (dirp->handle == INVALID_HANDLE_VALUE) {
946 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
947 free(dirp->path);
948 free(dirp);
949 errno = EACCES;
950 return 0;
951 }
952 }
953 return dirp;
954 }
955
956 /* parameter dbuf unused on Windows */
957
958 struct dirent *
959 os::readdir(DIR *dirp, dirent *dbuf)
960 {
961 assert(dirp != NULL, "just checking"); // hotspot change
962 if (dirp->handle == INVALID_HANDLE_VALUE) {
963 return 0;
964 }
965
966 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
967
968 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
969 if (GetLastError() == ERROR_INVALID_HANDLE) {
970 errno = EBADF;
971 return 0;
972 }
973 FindClose(dirp->handle);
974 dirp->handle = INVALID_HANDLE_VALUE;
975 }
976
977 return &dirp->dirent;
978 }
979
980 int
981 os::closedir(DIR *dirp)
982 {
983 assert(dirp != NULL, "just checking"); // hotspot change
984 if (dirp->handle != INVALID_HANDLE_VALUE) {
985 if (!FindClose(dirp->handle)) {
986 errno = EBADF;
987 return -1;
988 }
989 dirp->handle = INVALID_HANDLE_VALUE;
990 }
991 free(dirp->path);
992 free(dirp);
993 return 0;
994 }
995
996 const char* os::dll_file_extension() { return ".dll"; }
997
998 const char* os::get_temp_directory() {
999 const char *prop = Arguments::get_property("java.io.tmpdir");
1000 if (prop != 0) return prop;
1001 static char path_buf[MAX_PATH];
1002 if (GetTempPath(MAX_PATH, path_buf)>0)
1003 return path_buf;
1004 else{
1005 path_buf[0]='\0';
1006 return path_buf;
1007 }
1008 }
1009
1010 static bool file_exists(const char* filename) {
1011 if (filename == NULL || strlen(filename) == 0) {
1012 return false;
1013 }
1014 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1015 }
1016
1017 void os::dll_build_name(char *buffer, size_t buflen,
1018 const char* pname, const char* fname) {
1019 // Copied from libhpi
1020 const size_t pnamelen = pname ? strlen(pname) : 0;
1021 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1022
1023 // Quietly truncates on buffer overflow. Should be an error.
1024 if (pnamelen + strlen(fname) + 10 > buflen) {
1025 *buffer = '\0';
1026 return;
1027 }
1028
1029 if (pnamelen == 0) {
1030 jio_snprintf(buffer, buflen, "%s.dll", fname);
1031 } else if (c == ':' || c == '\\') {
1032 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1033 } else if (strchr(pname, *os::path_separator()) != NULL) {
1034 int n;
1035 char** pelements = split_path(pname, &n);
1036 for (int i = 0 ; i < n ; i++) {
1037 char* path = pelements[i];
1038 // Really shouldn't be NULL, but check can't hurt
1039 size_t plen = (path == NULL) ? 0 : strlen(path);
1040 if (plen == 0) {
1041 continue; // skip the empty path values
1042 }
1043 const char lastchar = path[plen - 1];
1044 if (lastchar == ':' || lastchar == '\\') {
1045 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1046 } else {
1047 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1048 }
1049 if (file_exists(buffer)) {
1050 break;
1051 }
1052 }
1053 // release the storage
1054 for (int i = 0 ; i < n ; i++) {
1055 if (pelements[i] != NULL) {
1056 FREE_C_HEAP_ARRAY(char, pelements[i]);
1057 }
1058 }
1059 if (pelements != NULL) {
1060 FREE_C_HEAP_ARRAY(char*, pelements);
1061 }
1062 } else {
1063 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1064 }
1065 }
1066
1067 // Needs to be in os specific directory because windows requires another
1068 // header file <direct.h>
1069 const char* os::get_current_directory(char *buf, int buflen) {
1070 return _getcwd(buf, buflen);
1071 }
1072
1073 //-----------------------------------------------------------
1074 // Helper functions for fatal error handler
1075
1076 // The following library functions are resolved dynamically at runtime:
1077
1078 // PSAPI functions, for Windows NT, 2000, XP
1079
1080 // psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform
1081 // SDK from Microsoft. Here are the definitions copied from psapi.h
1082 typedef struct _MODULEINFO {
1083 LPVOID lpBaseOfDll;
1084 DWORD SizeOfImage;
1085 LPVOID EntryPoint;
1086 } MODULEINFO, *LPMODULEINFO;
1087
1088 static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD );
1089 static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD );
1090 static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD );
1091
1092 // ToolHelp Functions, for Windows 95, 98 and ME
1093
1094 static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ;
1095 static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ;
1096 static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ;
1097
1098 bool _has_psapi;
1099 bool _psapi_init = false;
1100 bool _has_toolhelp;
1101
1102 static bool _init_psapi() {
1103 HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ;
1104 if( psapi == NULL ) return false ;
1105
1106 _EnumProcessModules = CAST_TO_FN_PTR(
1107 BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD),
1108 GetProcAddress(psapi, "EnumProcessModules")) ;
1109 _GetModuleFileNameEx = CAST_TO_FN_PTR(
1110 DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD),
1111 GetProcAddress(psapi, "GetModuleFileNameExA"));
1112 _GetModuleInformation = CAST_TO_FN_PTR(
1113 BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD),
1114 GetProcAddress(psapi, "GetModuleInformation"));
1115
1116 _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation);
1117 _psapi_init = true;
1118 return _has_psapi;
1119 }
1120
1121 static bool _init_toolhelp() {
1122 HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ;
1123 if (kernel32 == NULL) return false ;
1124
1125 _CreateToolhelp32Snapshot = CAST_TO_FN_PTR(
1126 HANDLE(WINAPI *)(DWORD,DWORD),
1127 GetProcAddress(kernel32, "CreateToolhelp32Snapshot"));
1128 _Module32First = CAST_TO_FN_PTR(
1129 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1130 GetProcAddress(kernel32, "Module32First" ));
1131 _Module32Next = CAST_TO_FN_PTR(
1132 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1133 GetProcAddress(kernel32, "Module32Next" ));
1134
1135 _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next);
1136 return _has_toolhelp;
1137 }
1138
1139 #ifdef _WIN64
1140 // Helper routine which returns true if address in
1141 // within the NTDLL address space.
1142 //
1143 static bool _addr_in_ntdll( address addr )
1144 {
1145 HMODULE hmod;
1146 MODULEINFO minfo;
1147
1148 hmod = GetModuleHandle("NTDLL.DLL");
1149 if ( hmod == NULL ) return false;
1150 if ( !_GetModuleInformation( GetCurrentProcess(), hmod,
1151 &minfo, sizeof(MODULEINFO)) )
1152 return false;
1153
1154 if ( (addr >= minfo.lpBaseOfDll) &&
1155 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1156 return true;
1157 else
1158 return false;
1159 }
1160 #endif
1161
1162
1163 // Enumerate all modules for a given process ID
1164 //
1165 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1166 // different API for doing this. We use PSAPI.DLL on NT based
1167 // Windows and ToolHelp on 95/98/Me.
1168
1169 // Callback function that is called by enumerate_modules() on
1170 // every DLL module.
1171 // Input parameters:
1172 // int pid,
1173 // char* module_file_name,
1174 // address module_base_addr,
1175 // unsigned module_size,
1176 // void* param
1177 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1178
1179 // enumerate_modules for Windows NT, using PSAPI
1180 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1181 {
1182 HANDLE hProcess ;
1183
1184 # define MAX_NUM_MODULES 128
1185 HMODULE modules[MAX_NUM_MODULES];
1186 static char filename[ MAX_PATH ];
1187 int result = 0;
1188
1189 if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0;
1190
1191 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1192 FALSE, pid ) ;
1193 if (hProcess == NULL) return 0;
1194
1195 DWORD size_needed;
1196 if (!_EnumProcessModules(hProcess, modules,
1197 sizeof(modules), &size_needed)) {
1198 CloseHandle( hProcess );
1199 return 0;
1200 }
1201
1202 // number of modules that are currently loaded
1203 int num_modules = size_needed / sizeof(HMODULE);
1204
1205 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1206 // Get Full pathname:
1207 if(!_GetModuleFileNameEx(hProcess, modules[i],
1208 filename, sizeof(filename))) {
1209 filename[0] = '\0';
1210 }
1211
1212 MODULEINFO modinfo;
1213 if (!_GetModuleInformation(hProcess, modules[i],
1214 &modinfo, sizeof(modinfo))) {
1215 modinfo.lpBaseOfDll = NULL;
1216 modinfo.SizeOfImage = 0;
1217 }
1218
1219 // Invoke callback function
1220 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1221 modinfo.SizeOfImage, param);
1222 if (result) break;
1223 }
1224
1225 CloseHandle( hProcess ) ;
1226 return result;
1227 }
1228
1229
1230 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1231 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1232 {
1233 HANDLE hSnapShot ;
1234 static MODULEENTRY32 modentry ;
1235 int result = 0;
1236
1237 if (!_has_toolhelp) return 0;
1238
1239 // Get a handle to a Toolhelp snapshot of the system
1240 hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1241 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1242 return FALSE ;
1243 }
1244
1245 // iterate through all modules
1246 modentry.dwSize = sizeof(MODULEENTRY32) ;
1247 bool not_done = _Module32First( hSnapShot, &modentry ) != 0;
1248
1249 while( not_done ) {
1250 // invoke the callback
1251 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1252 modentry.modBaseSize, param);
1253 if (result) break;
1254
1255 modentry.dwSize = sizeof(MODULEENTRY32) ;
1256 not_done = _Module32Next( hSnapShot, &modentry ) != 0;
1257 }
1258
1259 CloseHandle(hSnapShot);
1260 return result;
1261 }
1262
1263 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1264 {
1265 // Get current process ID if caller doesn't provide it.
1266 if (!pid) pid = os::current_process_id();
1267
1268 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1269 else return _enumerate_modules_windows(pid, func, param);
1270 }
1271
1272 struct _modinfo {
1273 address addr;
1274 char* full_path; // point to a char buffer
1275 int buflen; // size of the buffer
1276 address base_addr;
1277 };
1278
1279 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1280 unsigned size, void * param) {
1281 struct _modinfo *pmod = (struct _modinfo *)param;
1282 if (!pmod) return -1;
1283
1284 if (base_addr <= pmod->addr &&
1285 base_addr+size > pmod->addr) {
1286 // if a buffer is provided, copy path name to the buffer
1287 if (pmod->full_path) {
1288 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1289 }
1290 pmod->base_addr = base_addr;
1291 return 1;
1292 }
1293 return 0;
1294 }
1295
1296 bool os::dll_address_to_library_name(address addr, char* buf,
1297 int buflen, int* offset) {
1298 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1299 // return the full path to the DLL file, sometimes it returns path
1300 // to the corresponding PDB file (debug info); sometimes it only
1301 // returns partial path, which makes life painful.
1302
1303 struct _modinfo mi;
1304 mi.addr = addr;
1305 mi.full_path = buf;
1306 mi.buflen = buflen;
1307 int pid = os::current_process_id();
1308 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1309 // buf already contains path name
1310 if (offset) *offset = addr - mi.base_addr;
1311 return true;
1312 } else {
1313 if (buf) buf[0] = '\0';
1314 if (offset) *offset = -1;
1315 return false;
1316 }
1317 }
1318
1319 bool os::dll_address_to_function_name(address addr, char *buf,
1320 int buflen, int *offset) {
1321 // Unimplemented on Windows - in order to use SymGetSymFromAddr(),
1322 // we need to initialize imagehlp/dbghelp, then load symbol table
1323 // for every module. That's too much work to do after a fatal error.
1324 // For an example on how to implement this function, see 1.4.2.
1325 if (offset) *offset = -1;
1326 if (buf) buf[0] = '\0';
1327 return false;
1328 }
1329
1330 void* os::dll_lookup(void* handle, const char* name) {
1331 return GetProcAddress((HMODULE)handle, name);
1332 }
1333
1334 // save the start and end address of jvm.dll into param[0] and param[1]
1335 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1336 unsigned size, void * param) {
1337 if (!param) return -1;
1338
1339 if (base_addr <= (address)_locate_jvm_dll &&
1340 base_addr+size > (address)_locate_jvm_dll) {
1341 ((address*)param)[0] = base_addr;
1342 ((address*)param)[1] = base_addr + size;
1343 return 1;
1344 }
1345 return 0;
1346 }
1347
1348 address vm_lib_location[2]; // start and end address of jvm.dll
1349
1350 // check if addr is inside jvm.dll
1351 bool os::address_is_in_vm(address addr) {
1352 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1353 int pid = os::current_process_id();
1354 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1355 assert(false, "Can't find jvm module.");
1356 return false;
1357 }
1358 }
1359
1360 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1361 }
1362
1363 // print module info; param is outputStream*
1364 static int _print_module(int pid, char* fname, address base,
1365 unsigned size, void* param) {
1366 if (!param) return -1;
1367
1368 outputStream* st = (outputStream*)param;
1369
1370 address end_addr = base + size;
1371 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1372 return 0;
1373 }
1374
1375 // Loads .dll/.so and
1376 // in case of error it checks if .dll/.so was built for the
1377 // same architecture as Hotspot is running on
1378 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1379 {
1380 void * result = LoadLibrary(name);
1381 if (result != NULL)
1382 {
1383 return result;
1384 }
1385
1386 long errcode = GetLastError();
1387 if (errcode == ERROR_MOD_NOT_FOUND) {
1388 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1389 ebuf[ebuflen-1]='\0';
1390 return NULL;
1391 }
1392
1393 // Parsing dll below
1394 // If we can read dll-info and find that dll was built
1395 // for an architecture other than Hotspot is running in
1396 // - then print to buffer "DLL was built for a different architecture"
1397 // else call getLastErrorString to obtain system error message
1398
1399 // Read system error message into ebuf
1400 // It may or may not be overwritten below (in the for loop and just above)
1401 getLastErrorString(ebuf, (size_t) ebuflen);
1402 ebuf[ebuflen-1]='\0';
1403 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1404 if (file_descriptor<0)
1405 {
1406 return NULL;
1407 }
1408
1409 uint32_t signature_offset;
1410 uint16_t lib_arch=0;
1411 bool failed_to_get_lib_arch=
1412 (
1413 //Go to position 3c in the dll
1414 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1415 ||
1416 // Read loacation of signature
1417 (sizeof(signature_offset)!=
1418 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1419 ||
1420 //Go to COFF File Header in dll
1421 //that is located after"signature" (4 bytes long)
1422 (os::seek_to_file_offset(file_descriptor,
1423 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1424 ||
1425 //Read field that contains code of architecture
1426 // that dll was build for
1427 (sizeof(lib_arch)!=
1428 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1429 );
1430
1431 ::close(file_descriptor);
1432 if (failed_to_get_lib_arch)
1433 {
1434 // file i/o error - report getLastErrorString(...) msg
1435 return NULL;
1436 }
1437
1438 typedef struct
1439 {
1440 uint16_t arch_code;
1441 char* arch_name;
1442 } arch_t;
1443
1444 static const arch_t arch_array[]={
1445 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1446 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1447 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1448 };
1449 #if (defined _M_IA64)
1450 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1451 #elif (defined _M_AMD64)
1452 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1453 #elif (defined _M_IX86)
1454 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1455 #else
1456 #error Method os::dll_load requires that one of following \
1457 is defined :_M_IA64,_M_AMD64 or _M_IX86
1458 #endif
1459
1460
1461 // Obtain a string for printf operation
1462 // lib_arch_str shall contain string what platform this .dll was built for
1463 // running_arch_str shall string contain what platform Hotspot was built for
1464 char *running_arch_str=NULL,*lib_arch_str=NULL;
1465 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1466 {
1467 if (lib_arch==arch_array[i].arch_code)
1468 lib_arch_str=arch_array[i].arch_name;
1469 if (running_arch==arch_array[i].arch_code)
1470 running_arch_str=arch_array[i].arch_name;
1471 }
1472
1473 assert(running_arch_str,
1474 "Didn't find runing architecture code in arch_array");
1475
1476 // If the architure is right
1477 // but some other error took place - report getLastErrorString(...) msg
1478 if (lib_arch == running_arch)
1479 {
1480 return NULL;
1481 }
1482
1483 if (lib_arch_str!=NULL)
1484 {
1485 ::_snprintf(ebuf, ebuflen-1,
1486 "Can't load %s-bit .dll on a %s-bit platform",
1487 lib_arch_str,running_arch_str);
1488 }
1489 else
1490 {
1491 // don't know what architecture this dll was build for
1492 ::_snprintf(ebuf, ebuflen-1,
1493 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1494 lib_arch,running_arch_str);
1495 }
1496
1497 return NULL;
1498 }
1499
1500
1501 void os::print_dll_info(outputStream *st) {
1502 int pid = os::current_process_id();
1503 st->print_cr("Dynamic libraries:");
1504 enumerate_modules(pid, _print_module, (void *)st);
1505 }
1506
1507 // function pointer to Windows API "GetNativeSystemInfo".
1508 typedef void (WINAPI *GetNativeSystemInfo_func_type)(LPSYSTEM_INFO);
1509 static GetNativeSystemInfo_func_type _GetNativeSystemInfo;
1510
1511 void os::print_os_info(outputStream* st) {
1512 st->print("OS:");
1513
1514 OSVERSIONINFOEX osvi;
1515 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1516 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1517
1518 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1519 st->print_cr("N/A");
1520 return;
1521 }
1522
1523 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1524 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1525 switch (os_vers) {
1526 case 3051: st->print(" Windows NT 3.51"); break;
1527 case 4000: st->print(" Windows NT 4.0"); break;
1528 case 5000: st->print(" Windows 2000"); break;
1529 case 5001: st->print(" Windows XP"); break;
1530 case 5002:
1531 case 6000:
1532 case 6001: {
1533 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1534 // find out whether we are running on 64 bit processor or not.
1535 SYSTEM_INFO si;
1536 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1537 // Check to see if _GetNativeSystemInfo has been initialized.
1538 if (_GetNativeSystemInfo == NULL) {
1539 HMODULE hKernel32 = GetModuleHandle(TEXT("kernel32.dll"));
1540 _GetNativeSystemInfo =
1541 CAST_TO_FN_PTR(GetNativeSystemInfo_func_type,
1542 GetProcAddress(hKernel32,
1543 "GetNativeSystemInfo"));
1544 if (_GetNativeSystemInfo == NULL)
1545 GetSystemInfo(&si);
1546 } else {
1547 _GetNativeSystemInfo(&si);
1548 }
1549 if (os_vers == 5002) {
1550 if (osvi.wProductType == VER_NT_WORKSTATION &&
1551 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1552 st->print(" Windows XP x64 Edition");
1553 else
1554 st->print(" Windows Server 2003 family");
1555 } else if (os_vers == 6000) {
1556 if (osvi.wProductType == VER_NT_WORKSTATION)
1557 st->print(" Windows Vista");
1558 else
1559 st->print(" Windows Server 2008");
1560 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1561 st->print(" , 64 bit");
1562 } else if (os_vers == 6001) {
1563 if (osvi.wProductType == VER_NT_WORKSTATION) {
1564 st->print(" Windows 7");
1565 } else {
1566 // Unrecognized windows, print out its major and minor versions
1567 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1568 }
1569 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1570 st->print(" , 64 bit");
1571 } else { // future os
1572 // Unrecognized windows, print out its major and minor versions
1573 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1574 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1575 st->print(" , 64 bit");
1576 }
1577 break;
1578 }
1579 default: // future windows, print out its major and minor versions
1580 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1581 }
1582 } else {
1583 switch (os_vers) {
1584 case 4000: st->print(" Windows 95"); break;
1585 case 4010: st->print(" Windows 98"); break;
1586 case 4090: st->print(" Windows Me"); break;
1587 default: // future windows, print out its major and minor versions
1588 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1589 }
1590 }
1591 st->print(" Build %d", osvi.dwBuildNumber);
1592 st->print(" %s", osvi.szCSDVersion); // service pack
1593 st->cr();
1594 }
1595
1596 void os::print_memory_info(outputStream* st) {
1597 st->print("Memory:");
1598 st->print(" %dk page", os::vm_page_size()>>10);
1599
1600 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1601 // value if total memory is larger than 4GB
1602 MEMORYSTATUSEX ms;
1603 ms.dwLength = sizeof(ms);
1604 GlobalMemoryStatusEx(&ms);
1605
1606 st->print(", physical %uk", os::physical_memory() >> 10);
1607 st->print("(%uk free)", os::available_memory() >> 10);
1608
1609 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1610 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1611 st->cr();
1612 }
1613
1614 void os::print_siginfo(outputStream *st, void *siginfo) {
1615 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1616 st->print("siginfo:");
1617 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1618
1619 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1620 er->NumberParameters >= 2) {
1621 switch (er->ExceptionInformation[0]) {
1622 case 0: st->print(", reading address"); break;
1623 case 1: st->print(", writing address"); break;
1624 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1625 er->ExceptionInformation[0]);
1626 }
1627 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1628 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1629 er->NumberParameters >= 2 && UseSharedSpaces) {
1630 FileMapInfo* mapinfo = FileMapInfo::current_info();
1631 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1632 st->print("\n\nError accessing class data sharing archive." \
1633 " Mapped file inaccessible during execution, " \
1634 " possible disk/network problem.");
1635 }
1636 } else {
1637 int num = er->NumberParameters;
1638 if (num > 0) {
1639 st->print(", ExceptionInformation=");
1640 for (int i = 0; i < num; i++) {
1641 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1642 }
1643 }
1644 }
1645 st->cr();
1646 }
1647
1648 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1649 // do nothing
1650 }
1651
1652 static char saved_jvm_path[MAX_PATH] = {0};
1653
1654 // Find the full path to the current module, jvm.dll or jvm_g.dll
1655 void os::jvm_path(char *buf, jint buflen) {
1656 // Error checking.
1657 if (buflen < MAX_PATH) {
1658 assert(false, "must use a large-enough buffer");
1659 buf[0] = '\0';
1660 return;
1661 }
1662 // Lazy resolve the path to current module.
1663 if (saved_jvm_path[0] != 0) {
1664 strcpy(buf, saved_jvm_path);
1665 return;
1666 }
1667
1668 GetModuleFileName(vm_lib_handle, buf, buflen);
1669 strcpy(saved_jvm_path, buf);
1670 }
1671
1672
1673 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1674 #ifndef _WIN64
1675 st->print("_");
1676 #endif
1677 }
1678
1679
1680 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1681 #ifndef _WIN64
1682 st->print("@%d", args_size * sizeof(int));
1683 #endif
1684 }
1685
1686 // sun.misc.Signal
1687 // NOTE that this is a workaround for an apparent kernel bug where if
1688 // a signal handler for SIGBREAK is installed then that signal handler
1689 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1690 // See bug 4416763.
1691 static void (*sigbreakHandler)(int) = NULL;
1692
1693 static void UserHandler(int sig, void *siginfo, void *context) {
1694 os::signal_notify(sig);
1695 // We need to reinstate the signal handler each time...
1696 os::signal(sig, (void*)UserHandler);
1697 }
1698
1699 void* os::user_handler() {
1700 return (void*) UserHandler;
1701 }
1702
1703 void* os::signal(int signal_number, void* handler) {
1704 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1705 void (*oldHandler)(int) = sigbreakHandler;
1706 sigbreakHandler = (void (*)(int)) handler;
1707 return (void*) oldHandler;
1708 } else {
1709 return (void*)::signal(signal_number, (void (*)(int))handler);
1710 }
1711 }
1712
1713 void os::signal_raise(int signal_number) {
1714 raise(signal_number);
1715 }
1716
1717 // The Win32 C runtime library maps all console control events other than ^C
1718 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1719 // logoff, and shutdown events. We therefore install our own console handler
1720 // that raises SIGTERM for the latter cases.
1721 //
1722 static BOOL WINAPI consoleHandler(DWORD event) {
1723 switch(event) {
1724 case CTRL_C_EVENT:
1725 if (is_error_reported()) {
1726 // Ctrl-C is pressed during error reporting, likely because the error
1727 // handler fails to abort. Let VM die immediately.
1728 os::die();
1729 }
1730
1731 os::signal_raise(SIGINT);
1732 return TRUE;
1733 break;
1734 case CTRL_BREAK_EVENT:
1735 if (sigbreakHandler != NULL) {
1736 (*sigbreakHandler)(SIGBREAK);
1737 }
1738 return TRUE;
1739 break;
1740 case CTRL_CLOSE_EVENT:
1741 case CTRL_LOGOFF_EVENT:
1742 case CTRL_SHUTDOWN_EVENT:
1743 os::signal_raise(SIGTERM);
1744 return TRUE;
1745 break;
1746 default:
1747 break;
1748 }
1749 return FALSE;
1750 }
1751
1752 /*
1753 * The following code is moved from os.cpp for making this
1754 * code platform specific, which it is by its very nature.
1755 */
1756
1757 // Return maximum OS signal used + 1 for internal use only
1758 // Used as exit signal for signal_thread
1759 int os::sigexitnum_pd(){
1760 return NSIG;
1761 }
1762
1763 // a counter for each possible signal value, including signal_thread exit signal
1764 static volatile jint pending_signals[NSIG+1] = { 0 };
1765 static HANDLE sig_sem;
1766
1767 void os::signal_init_pd() {
1768 // Initialize signal structures
1769 memset((void*)pending_signals, 0, sizeof(pending_signals));
1770
1771 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
1772
1773 // Programs embedding the VM do not want it to attempt to receive
1774 // events like CTRL_LOGOFF_EVENT, which are used to implement the
1775 // shutdown hooks mechanism introduced in 1.3. For example, when
1776 // the VM is run as part of a Windows NT service (i.e., a servlet
1777 // engine in a web server), the correct behavior is for any console
1778 // control handler to return FALSE, not TRUE, because the OS's
1779 // "final" handler for such events allows the process to continue if
1780 // it is a service (while terminating it if it is not a service).
1781 // To make this behavior uniform and the mechanism simpler, we
1782 // completely disable the VM's usage of these console events if -Xrs
1783 // (=ReduceSignalUsage) is specified. This means, for example, that
1784 // the CTRL-BREAK thread dump mechanism is also disabled in this
1785 // case. See bugs 4323062, 4345157, and related bugs.
1786
1787 if (!ReduceSignalUsage) {
1788 // Add a CTRL-C handler
1789 SetConsoleCtrlHandler(consoleHandler, TRUE);
1790 }
1791 }
1792
1793 void os::signal_notify(int signal_number) {
1794 BOOL ret;
1795
1796 Atomic::inc(&pending_signals[signal_number]);
1797 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1798 assert(ret != 0, "ReleaseSemaphore() failed");
1799 }
1800
1801 static int check_pending_signals(bool wait_for_signal) {
1802 DWORD ret;
1803 while (true) {
1804 for (int i = 0; i < NSIG + 1; i++) {
1805 jint n = pending_signals[i];
1806 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1807 return i;
1808 }
1809 }
1810 if (!wait_for_signal) {
1811 return -1;
1812 }
1813
1814 JavaThread *thread = JavaThread::current();
1815
1816 ThreadBlockInVM tbivm(thread);
1817
1818 bool threadIsSuspended;
1819 do {
1820 thread->set_suspend_equivalent();
1821 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1822 ret = ::WaitForSingleObject(sig_sem, INFINITE);
1823 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
1824
1825 // were we externally suspended while we were waiting?
1826 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1827 if (threadIsSuspended) {
1828 //
1829 // The semaphore has been incremented, but while we were waiting
1830 // another thread suspended us. We don't want to continue running
1831 // while suspended because that would surprise the thread that
1832 // suspended us.
1833 //
1834 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1835 assert(ret != 0, "ReleaseSemaphore() failed");
1836
1837 thread->java_suspend_self();
1838 }
1839 } while (threadIsSuspended);
1840 }
1841 }
1842
1843 int os::signal_lookup() {
1844 return check_pending_signals(false);
1845 }
1846
1847 int os::signal_wait() {
1848 return check_pending_signals(true);
1849 }
1850
1851 // Implicit OS exception handling
1852
1853 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
1854 JavaThread* thread = JavaThread::current();
1855 // Save pc in thread
1856 #ifdef _M_IA64
1857 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP);
1858 // Set pc to handler
1859 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
1860 #elif _M_AMD64
1861 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip);
1862 // Set pc to handler
1863 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
1864 #else
1865 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip);
1866 // Set pc to handler
1867 exceptionInfo->ContextRecord->Eip = (LONG)handler;
1868 #endif
1869
1870 // Continue the execution
1871 return EXCEPTION_CONTINUE_EXECUTION;
1872 }
1873
1874
1875 // Used for PostMortemDump
1876 extern "C" void safepoints();
1877 extern "C" void find(int x);
1878 extern "C" void events();
1879
1880 // According to Windows API documentation, an illegal instruction sequence should generate
1881 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
1882 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
1883 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
1884
1885 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
1886
1887 // From "Execution Protection in the Windows Operating System" draft 0.35
1888 // Once a system header becomes available, the "real" define should be
1889 // included or copied here.
1890 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
1891
1892 #define def_excpt(val) #val, val
1893
1894 struct siglabel {
1895 char *name;
1896 int number;
1897 };
1898
1899 struct siglabel exceptlabels[] = {
1900 def_excpt(EXCEPTION_ACCESS_VIOLATION),
1901 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
1902 def_excpt(EXCEPTION_BREAKPOINT),
1903 def_excpt(EXCEPTION_SINGLE_STEP),
1904 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
1905 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
1906 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
1907 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
1908 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
1909 def_excpt(EXCEPTION_FLT_OVERFLOW),
1910 def_excpt(EXCEPTION_FLT_STACK_CHECK),
1911 def_excpt(EXCEPTION_FLT_UNDERFLOW),
1912 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
1913 def_excpt(EXCEPTION_INT_OVERFLOW),
1914 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
1915 def_excpt(EXCEPTION_IN_PAGE_ERROR),
1916 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
1917 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
1918 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
1919 def_excpt(EXCEPTION_STACK_OVERFLOW),
1920 def_excpt(EXCEPTION_INVALID_DISPOSITION),
1921 def_excpt(EXCEPTION_GUARD_PAGE),
1922 def_excpt(EXCEPTION_INVALID_HANDLE),
1923 NULL, 0
1924 };
1925
1926 const char* os::exception_name(int exception_code, char *buf, size_t size) {
1927 for (int i = 0; exceptlabels[i].name != NULL; i++) {
1928 if (exceptlabels[i].number == exception_code) {
1929 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
1930 return buf;
1931 }
1932 }
1933
1934 return NULL;
1935 }
1936
1937 //-----------------------------------------------------------------------------
1938 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
1939 // handle exception caused by idiv; should only happen for -MinInt/-1
1940 // (division by zero is handled explicitly)
1941 #ifdef _M_IA64
1942 assert(0, "Fix Handle_IDiv_Exception");
1943 #elif _M_AMD64
1944 PCONTEXT ctx = exceptionInfo->ContextRecord;
1945 address pc = (address)ctx->Rip;
1946 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
1947 assert(pc[0] == 0xF7, "not an idiv opcode");
1948 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
1949 assert(ctx->Rax == min_jint, "unexpected idiv exception");
1950 // set correct result values and continue after idiv instruction
1951 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
1952 ctx->Rax = (DWORD)min_jint; // result
1953 ctx->Rdx = (DWORD)0; // remainder
1954 // Continue the execution
1955 #else
1956 PCONTEXT ctx = exceptionInfo->ContextRecord;
1957 address pc = (address)ctx->Eip;
1958 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
1959 assert(pc[0] == 0xF7, "not an idiv opcode");
1960 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
1961 assert(ctx->Eax == min_jint, "unexpected idiv exception");
1962 // set correct result values and continue after idiv instruction
1963 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
1964 ctx->Eax = (DWORD)min_jint; // result
1965 ctx->Edx = (DWORD)0; // remainder
1966 // Continue the execution
1967 #endif
1968 return EXCEPTION_CONTINUE_EXECUTION;
1969 }
1970
1971 #ifndef _WIN64
1972 //-----------------------------------------------------------------------------
1973 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
1974 // handle exception caused by native method modifying control word
1975 PCONTEXT ctx = exceptionInfo->ContextRecord;
1976 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
1977
1978 switch (exception_code) {
1979 case EXCEPTION_FLT_DENORMAL_OPERAND:
1980 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
1981 case EXCEPTION_FLT_INEXACT_RESULT:
1982 case EXCEPTION_FLT_INVALID_OPERATION:
1983 case EXCEPTION_FLT_OVERFLOW:
1984 case EXCEPTION_FLT_STACK_CHECK:
1985 case EXCEPTION_FLT_UNDERFLOW:
1986 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
1987 if (fp_control_word != ctx->FloatSave.ControlWord) {
1988 // Restore FPCW and mask out FLT exceptions
1989 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
1990 // Mask out pending FLT exceptions
1991 ctx->FloatSave.StatusWord &= 0xffffff00;
1992 return EXCEPTION_CONTINUE_EXECUTION;
1993 }
1994 }
1995
1996 if (prev_uef_handler != NULL) {
1997 // We didn't handle this exception so pass it to the previous
1998 // UnhandledExceptionFilter.
1999 return (prev_uef_handler)(exceptionInfo);
2000 }
2001
2002 return EXCEPTION_CONTINUE_SEARCH;
2003 }
2004 #else //_WIN64
2005 /*
2006 On Windows, the mxcsr control bits are non-volatile across calls
2007 See also CR 6192333
2008 If EXCEPTION_FLT_* happened after some native method modified
2009 mxcsr - it is not a jvm fault.
2010 However should we decide to restore of mxcsr after a faulty
2011 native method we can uncomment following code
2012 jint MxCsr = INITIAL_MXCSR;
2013 // we can't use StubRoutines::addr_mxcsr_std()
2014 // because in Win64 mxcsr is not saved there
2015 if (MxCsr != ctx->MxCsr) {
2016 ctx->MxCsr = MxCsr;
2017 return EXCEPTION_CONTINUE_EXECUTION;
2018 }
2019
2020 */
2021 #endif //_WIN64
2022
2023
2024 // Fatal error reporting is single threaded so we can make this a
2025 // static and preallocated. If it's more than MAX_PATH silently ignore
2026 // it.
2027 static char saved_error_file[MAX_PATH] = {0};
2028
2029 void os::set_error_file(const char *logfile) {
2030 if (strlen(logfile) <= MAX_PATH) {
2031 strncpy(saved_error_file, logfile, MAX_PATH);
2032 }
2033 }
2034
2035 static inline void report_error(Thread* t, DWORD exception_code,
2036 address addr, void* siginfo, void* context) {
2037 VMError err(t, exception_code, addr, siginfo, context);
2038 err.report_and_die();
2039
2040 // If UseOsErrorReporting, this will return here and save the error file
2041 // somewhere where we can find it in the minidump.
2042 }
2043
2044 //-----------------------------------------------------------------------------
2045 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2046 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2047 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2048 #ifdef _M_IA64
2049 address pc = (address) exceptionInfo->ContextRecord->StIIP;
2050 #elif _M_AMD64
2051 address pc = (address) exceptionInfo->ContextRecord->Rip;
2052 #else
2053 address pc = (address) exceptionInfo->ContextRecord->Eip;
2054 #endif
2055 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2056
2057 #ifndef _WIN64
2058 // Execution protection violation - win32 running on AMD64 only
2059 // Handled first to avoid misdiagnosis as a "normal" access violation;
2060 // This is safe to do because we have a new/unique ExceptionInformation
2061 // code for this condition.
2062 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2063 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2064 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2065 address addr = (address) exceptionRecord->ExceptionInformation[1];
2066
2067 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2068 int page_size = os::vm_page_size();
2069
2070 // Make sure the pc and the faulting address are sane.
2071 //
2072 // If an instruction spans a page boundary, and the page containing
2073 // the beginning of the instruction is executable but the following
2074 // page is not, the pc and the faulting address might be slightly
2075 // different - we still want to unguard the 2nd page in this case.
2076 //
2077 // 15 bytes seems to be a (very) safe value for max instruction size.
2078 bool pc_is_near_addr =
2079 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2080 bool instr_spans_page_boundary =
2081 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2082 (intptr_t) page_size) > 0);
2083
2084 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2085 static volatile address last_addr =
2086 (address) os::non_memory_address_word();
2087
2088 // In conservative mode, don't unguard unless the address is in the VM
2089 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2090 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2091
2092 // Set memory to RWX and retry
2093 address page_start =
2094 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2095 bool res = os::protect_memory((char*) page_start, page_size,
2096 os::MEM_PROT_RWX);
2097
2098 if (PrintMiscellaneous && Verbose) {
2099 char buf[256];
2100 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2101 "at " INTPTR_FORMAT
2102 ", unguarding " INTPTR_FORMAT ": %s", addr,
2103 page_start, (res ? "success" : strerror(errno)));
2104 tty->print_raw_cr(buf);
2105 }
2106
2107 // Set last_addr so if we fault again at the same address, we don't
2108 // end up in an endless loop.
2109 //
2110 // There are two potential complications here. Two threads trapping
2111 // at the same address at the same time could cause one of the
2112 // threads to think it already unguarded, and abort the VM. Likely
2113 // very rare.
2114 //
2115 // The other race involves two threads alternately trapping at
2116 // different addresses and failing to unguard the page, resulting in
2117 // an endless loop. This condition is probably even more unlikely
2118 // than the first.
2119 //
2120 // Although both cases could be avoided by using locks or thread
2121 // local last_addr, these solutions are unnecessary complication:
2122 // this handler is a best-effort safety net, not a complete solution.
2123 // It is disabled by default and should only be used as a workaround
2124 // in case we missed any no-execute-unsafe VM code.
2125
2126 last_addr = addr;
2127
2128 return EXCEPTION_CONTINUE_EXECUTION;
2129 }
2130 }
2131
2132 // Last unguard failed or not unguarding
2133 tty->print_raw_cr("Execution protection violation");
2134 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2135 exceptionInfo->ContextRecord);
2136 return EXCEPTION_CONTINUE_SEARCH;
2137 }
2138 }
2139 #endif // _WIN64
2140
2141 // Check to see if we caught the safepoint code in the
2142 // process of write protecting the memory serialization page.
2143 // It write enables the page immediately after protecting it
2144 // so just return.
2145 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2146 JavaThread* thread = (JavaThread*) t;
2147 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2148 address addr = (address) exceptionRecord->ExceptionInformation[1];
2149 if ( os::is_memory_serialize_page(thread, addr) ) {
2150 // Block current thread until the memory serialize page permission restored.
2151 os::block_on_serialize_page_trap();
2152 return EXCEPTION_CONTINUE_EXECUTION;
2153 }
2154 }
2155
2156
2157 if (t != NULL && t->is_Java_thread()) {
2158 JavaThread* thread = (JavaThread*) t;
2159 bool in_java = thread->thread_state() == _thread_in_Java;
2160
2161 // Handle potential stack overflows up front.
2162 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2163 if (os::uses_stack_guard_pages()) {
2164 #ifdef _M_IA64
2165 //
2166 // If it's a legal stack address continue, Windows will map it in.
2167 //
2168 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2169 address addr = (address) exceptionRecord->ExceptionInformation[1];
2170 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() )
2171 return EXCEPTION_CONTINUE_EXECUTION;
2172
2173 // The register save area is the same size as the memory stack
2174 // and starts at the page just above the start of the memory stack.
2175 // If we get a fault in this area, we've run out of register
2176 // stack. If we are in java, try throwing a stack overflow exception.
2177 if (addr > thread->stack_base() &&
2178 addr <= (thread->stack_base()+thread->stack_size()) ) {
2179 char buf[256];
2180 jio_snprintf(buf, sizeof(buf),
2181 "Register stack overflow, addr:%p, stack_base:%p\n",
2182 addr, thread->stack_base() );
2183 tty->print_raw_cr(buf);
2184 // If not in java code, return and hope for the best.
2185 return in_java ? Handle_Exception(exceptionInfo,
2186 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2187 : EXCEPTION_CONTINUE_EXECUTION;
2188 }
2189 #endif
2190 if (thread->stack_yellow_zone_enabled()) {
2191 // Yellow zone violation. The o/s has unprotected the first yellow
2192 // zone page for us. Note: must call disable_stack_yellow_zone to
2193 // update the enabled status, even if the zone contains only one page.
2194 thread->disable_stack_yellow_zone();
2195 // If not in java code, return and hope for the best.
2196 return in_java ? Handle_Exception(exceptionInfo,
2197 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2198 : EXCEPTION_CONTINUE_EXECUTION;
2199 } else {
2200 // Fatal red zone violation.
2201 thread->disable_stack_red_zone();
2202 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2203 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2204 exceptionInfo->ContextRecord);
2205 return EXCEPTION_CONTINUE_SEARCH;
2206 }
2207 } else if (in_java) {
2208 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2209 // a one-time-only guard page, which it has released to us. The next
2210 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2211 return Handle_Exception(exceptionInfo,
2212 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2213 } else {
2214 // Can only return and hope for the best. Further stack growth will
2215 // result in an ACCESS_VIOLATION.
2216 return EXCEPTION_CONTINUE_EXECUTION;
2217 }
2218 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2219 // Either stack overflow or null pointer exception.
2220 if (in_java) {
2221 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2222 address addr = (address) exceptionRecord->ExceptionInformation[1];
2223 address stack_end = thread->stack_base() - thread->stack_size();
2224 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2225 // Stack overflow.
2226 assert(!os::uses_stack_guard_pages(),
2227 "should be caught by red zone code above.");
2228 return Handle_Exception(exceptionInfo,
2229 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2230 }
2231 //
2232 // Check for safepoint polling and implicit null
2233 // We only expect null pointers in the stubs (vtable)
2234 // the rest are checked explicitly now.
2235 //
2236 CodeBlob* cb = CodeCache::find_blob(pc);
2237 if (cb != NULL) {
2238 if (os::is_poll_address(addr)) {
2239 address stub = SharedRuntime::get_poll_stub(pc);
2240 return Handle_Exception(exceptionInfo, stub);
2241 }
2242 }
2243 {
2244 #ifdef _WIN64
2245 //
2246 // If it's a legal stack address map the entire region in
2247 //
2248 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2249 address addr = (address) exceptionRecord->ExceptionInformation[1];
2250 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2251 addr = (address)((uintptr_t)addr &
2252 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2253 os::commit_memory((char *)addr, thread->stack_base() - addr,
2254 false );
2255 return EXCEPTION_CONTINUE_EXECUTION;
2256 }
2257 else
2258 #endif
2259 {
2260 // Null pointer exception.
2261 #ifdef _M_IA64
2262 // We catch register stack overflows in compiled code by doing
2263 // an explicit compare and executing a st8(G0, G0) if the
2264 // BSP enters into our guard area. We test for the overflow
2265 // condition and fall into the normal null pointer exception
2266 // code if BSP hasn't overflowed.
2267 if ( in_java ) {
2268 if(thread->register_stack_overflow()) {
2269 assert((address)exceptionInfo->ContextRecord->IntS3 ==
2270 thread->register_stack_limit(),
2271 "GR7 doesn't contain register_stack_limit");
2272 // Disable the yellow zone which sets the state that
2273 // we've got a stack overflow problem.
2274 if (thread->stack_yellow_zone_enabled()) {
2275 thread->disable_stack_yellow_zone();
2276 }
2277 // Give us some room to process the exception
2278 thread->disable_register_stack_guard();
2279 // Update GR7 with the new limit so we can continue running
2280 // compiled code.
2281 exceptionInfo->ContextRecord->IntS3 =
2282 (ULONGLONG)thread->register_stack_limit();
2283 return Handle_Exception(exceptionInfo,
2284 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2285 } else {
2286 //
2287 // Check for implicit null
2288 // We only expect null pointers in the stubs (vtable)
2289 // the rest are checked explicitly now.
2290 //
2291 if (((uintptr_t)addr) < os::vm_page_size() ) {
2292 // an access to the first page of VM--assume it is a null pointer
2293 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2294 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2295 }
2296 }
2297 } // in_java
2298
2299 // IA64 doesn't use implicit null checking yet. So we shouldn't
2300 // get here.
2301 tty->print_raw_cr("Access violation, possible null pointer exception");
2302 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2303 exceptionInfo->ContextRecord);
2304 return EXCEPTION_CONTINUE_SEARCH;
2305 #else /* !IA64 */
2306
2307 // Windows 98 reports faulting addresses incorrectly
2308 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2309 !os::win32::is_nt()) {
2310 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2311 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2312 }
2313 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2314 exceptionInfo->ContextRecord);
2315 return EXCEPTION_CONTINUE_SEARCH;
2316 #endif
2317 }
2318 }
2319 }
2320
2321 #ifdef _WIN64
2322 // Special care for fast JNI field accessors.
2323 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2324 // in and the heap gets shrunk before the field access.
2325 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2326 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2327 if (addr != (address)-1) {
2328 return Handle_Exception(exceptionInfo, addr);
2329 }
2330 }
2331 #endif
2332
2333 #ifdef _WIN64
2334 // Windows will sometimes generate an access violation
2335 // when we call malloc. Since we use VectoredExceptions
2336 // on 64 bit platforms, we see this exception. We must
2337 // pass this exception on so Windows can recover.
2338 // We check to see if the pc of the fault is in NTDLL.DLL
2339 // if so, we pass control on to Windows for handling.
2340 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH;
2341 #endif
2342
2343 // Stack overflow or null pointer exception in native code.
2344 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2345 exceptionInfo->ContextRecord);
2346 return EXCEPTION_CONTINUE_SEARCH;
2347 }
2348
2349 if (in_java) {
2350 switch (exception_code) {
2351 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2352 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2353
2354 case EXCEPTION_INT_OVERFLOW:
2355 return Handle_IDiv_Exception(exceptionInfo);
2356
2357 } // switch
2358 }
2359 #ifndef _WIN64
2360 if ((thread->thread_state() == _thread_in_Java) ||
2361 (thread->thread_state() == _thread_in_native) )
2362 {
2363 LONG result=Handle_FLT_Exception(exceptionInfo);
2364 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2365 }
2366 #endif //_WIN64
2367 }
2368
2369 if (exception_code != EXCEPTION_BREAKPOINT) {
2370 #ifndef _WIN64
2371 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2372 exceptionInfo->ContextRecord);
2373 #else
2374 // Itanium Windows uses a VectoredExceptionHandler
2375 // Which means that C++ programatic exception handlers (try/except)
2376 // will get here. Continue the search for the right except block if
2377 // the exception code is not a fatal code.
2378 switch ( exception_code ) {
2379 case EXCEPTION_ACCESS_VIOLATION:
2380 case EXCEPTION_STACK_OVERFLOW:
2381 case EXCEPTION_ILLEGAL_INSTRUCTION:
2382 case EXCEPTION_ILLEGAL_INSTRUCTION_2:
2383 case EXCEPTION_INT_OVERFLOW:
2384 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2385 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2386 exceptionInfo->ContextRecord);
2387 }
2388 break;
2389 default:
2390 break;
2391 }
2392 #endif
2393 }
2394 return EXCEPTION_CONTINUE_SEARCH;
2395 }
2396
2397 #ifndef _WIN64
2398 // Special care for fast JNI accessors.
2399 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2400 // the heap gets shrunk before the field access.
2401 // Need to install our own structured exception handler since native code may
2402 // install its own.
2403 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2404 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2405 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2406 address pc = (address) exceptionInfo->ContextRecord->Eip;
2407 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2408 if (addr != (address)-1) {
2409 return Handle_Exception(exceptionInfo, addr);
2410 }
2411 }
2412 return EXCEPTION_CONTINUE_SEARCH;
2413 }
2414
2415 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2416 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2417 __try { \
2418 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2419 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2420 } \
2421 return 0; \
2422 }
2423
2424 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2425 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2426 DEFINE_FAST_GETFIELD(jchar, char, Char)
2427 DEFINE_FAST_GETFIELD(jshort, short, Short)
2428 DEFINE_FAST_GETFIELD(jint, int, Int)
2429 DEFINE_FAST_GETFIELD(jlong, long, Long)
2430 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2431 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2432
2433 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2434 switch (type) {
2435 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2436 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2437 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2438 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2439 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2440 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2441 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2442 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2443 default: ShouldNotReachHere();
2444 }
2445 return (address)-1;
2446 }
2447 #endif
2448
2449 // Virtual Memory
2450
2451 int os::vm_page_size() { return os::win32::vm_page_size(); }
2452 int os::vm_allocation_granularity() {
2453 return os::win32::vm_allocation_granularity();
2454 }
2455
2456 // Windows large page support is available on Windows 2003. In order to use
2457 // large page memory, the administrator must first assign additional privilege
2458 // to the user:
2459 // + select Control Panel -> Administrative Tools -> Local Security Policy
2460 // + select Local Policies -> User Rights Assignment
2461 // + double click "Lock pages in memory", add users and/or groups
2462 // + reboot
2463 // Note the above steps are needed for administrator as well, as administrators
2464 // by default do not have the privilege to lock pages in memory.
2465 //
2466 // Note about Windows 2003: although the API supports committing large page
2467 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2468 // scenario, I found through experiment it only uses large page if the entire
2469 // memory region is reserved and committed in a single VirtualAlloc() call.
2470 // This makes Windows large page support more or less like Solaris ISM, in
2471 // that the entire heap must be committed upfront. This probably will change
2472 // in the future, if so the code below needs to be revisited.
2473
2474 #ifndef MEM_LARGE_PAGES
2475 #define MEM_LARGE_PAGES 0x20000000
2476 #endif
2477
2478 // GetLargePageMinimum is only available on Windows 2003. The other functions
2479 // are available on NT but not on Windows 98/Me. We have to resolve them at
2480 // runtime.
2481 typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void);
2482 typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type)
2483 (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
2484 typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE);
2485 typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID);
2486
2487 static GetLargePageMinimum_func_type _GetLargePageMinimum;
2488 static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges;
2489 static OpenProcessToken_func_type _OpenProcessToken;
2490 static LookupPrivilegeValue_func_type _LookupPrivilegeValue;
2491
2492 static HINSTANCE _kernel32;
2493 static HINSTANCE _advapi32;
2494 static HANDLE _hProcess;
2495 static HANDLE _hToken;
2496
2497 static size_t _large_page_size = 0;
2498
2499 static bool resolve_functions_for_large_page_init() {
2500 _kernel32 = LoadLibrary("kernel32.dll");
2501 if (_kernel32 == NULL) return false;
2502
2503 _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type,
2504 GetProcAddress(_kernel32, "GetLargePageMinimum"));
2505 if (_GetLargePageMinimum == NULL) return false;
2506
2507 _advapi32 = LoadLibrary("advapi32.dll");
2508 if (_advapi32 == NULL) return false;
2509
2510 _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type,
2511 GetProcAddress(_advapi32, "AdjustTokenPrivileges"));
2512 _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type,
2513 GetProcAddress(_advapi32, "OpenProcessToken"));
2514 _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type,
2515 GetProcAddress(_advapi32, "LookupPrivilegeValueA"));
2516 return _AdjustTokenPrivileges != NULL &&
2517 _OpenProcessToken != NULL &&
2518 _LookupPrivilegeValue != NULL;
2519 }
2520
2521 static bool request_lock_memory_privilege() {
2522 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2523 os::current_process_id());
2524
2525 LUID luid;
2526 if (_hProcess != NULL &&
2527 _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2528 _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2529
2530 TOKEN_PRIVILEGES tp;
2531 tp.PrivilegeCount = 1;
2532 tp.Privileges[0].Luid = luid;
2533 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2534
2535 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2536 // privilege. Check GetLastError() too. See MSDN document.
2537 if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2538 (GetLastError() == ERROR_SUCCESS)) {
2539 return true;
2540 }
2541 }
2542
2543 return false;
2544 }
2545
2546 static void cleanup_after_large_page_init() {
2547 _GetLargePageMinimum = NULL;
2548 _AdjustTokenPrivileges = NULL;
2549 _OpenProcessToken = NULL;
2550 _LookupPrivilegeValue = NULL;
2551 if (_kernel32) FreeLibrary(_kernel32);
2552 _kernel32 = NULL;
2553 if (_advapi32) FreeLibrary(_advapi32);
2554 _advapi32 = NULL;
2555 if (_hProcess) CloseHandle(_hProcess);
2556 _hProcess = NULL;
2557 if (_hToken) CloseHandle(_hToken);
2558 _hToken = NULL;
2559 }
2560
2561 bool os::large_page_init() {
2562 if (!UseLargePages) return false;
2563
2564 // print a warning if any large page related flag is specified on command line
2565 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2566 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2567 bool success = false;
2568
2569 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2570 if (resolve_functions_for_large_page_init()) {
2571 if (request_lock_memory_privilege()) {
2572 size_t s = _GetLargePageMinimum();
2573 if (s) {
2574 #if defined(IA32) || defined(AMD64)
2575 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2576 WARN("JVM cannot use large pages bigger than 4mb.");
2577 } else {
2578 #endif
2579 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2580 _large_page_size = LargePageSizeInBytes;
2581 } else {
2582 _large_page_size = s;
2583 }
2584 success = true;
2585 #if defined(IA32) || defined(AMD64)
2586 }
2587 #endif
2588 } else {
2589 WARN("Large page is not supported by the processor.");
2590 }
2591 } else {
2592 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2593 }
2594 } else {
2595 WARN("Large page is not supported by the operating system.");
2596 }
2597 #undef WARN
2598
2599 const size_t default_page_size = (size_t) vm_page_size();
2600 if (success && _large_page_size > default_page_size) {
2601 _page_sizes[0] = _large_page_size;
2602 _page_sizes[1] = default_page_size;
2603 _page_sizes[2] = 0;
2604 }
2605
2606 cleanup_after_large_page_init();
2607 return success;
2608 }
2609
2610 // On win32, one cannot release just a part of reserved memory, it's an
2611 // all or nothing deal. When we split a reservation, we must break the
2612 // reservation into two reservations.
2613 void os::split_reserved_memory(char *base, size_t size, size_t split,
2614 bool realloc) {
2615 if (size > 0) {
2616 release_memory(base, size);
2617 if (realloc) {
2618 reserve_memory(split, base);
2619 }
2620 if (size != split) {
2621 reserve_memory(size - split, base + split);
2622 }
2623 }
2624 }
2625
2626 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
2627 assert((size_t)addr % os::vm_allocation_granularity() == 0,
2628 "reserve alignment");
2629 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
2630 char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
2631 assert(res == NULL || addr == NULL || addr == res,
2632 "Unexpected address from reserve.");
2633 return res;
2634 }
2635
2636 // Reserve memory at an arbitrary address, only if that area is
2637 // available (and not reserved for something else).
2638 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2639 // Windows os::reserve_memory() fails of the requested address range is
2640 // not avilable.
2641 return reserve_memory(bytes, requested_addr);
2642 }
2643
2644 size_t os::large_page_size() {
2645 return _large_page_size;
2646 }
2647
2648 bool os::can_commit_large_page_memory() {
2649 // Windows only uses large page memory when the entire region is reserved
2650 // and committed in a single VirtualAlloc() call. This may change in the
2651 // future, but with Windows 2003 it's not possible to commit on demand.
2652 return false;
2653 }
2654
2655 bool os::can_execute_large_page_memory() {
2656 return true;
2657 }
2658
2659 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
2660
2661 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
2662
2663 if (UseLargePagesIndividualAllocation) {
2664 if (TracePageSizes && Verbose) {
2665 tty->print_cr("Reserving large pages individually.");
2666 }
2667 char * p_buf;
2668 // first reserve enough address space in advance since we want to be
2669 // able to break a single contiguous virtual address range into multiple
2670 // large page commits but WS2003 does not allow reserving large page space
2671 // so we just use 4K pages for reserve, this gives us a legal contiguous
2672 // address space. then we will deallocate that reservation, and re alloc
2673 // using large pages
2674 const size_t size_of_reserve = bytes + _large_page_size;
2675 if (bytes > size_of_reserve) {
2676 // Overflowed.
2677 warning("Individually allocated large pages failed, "
2678 "use -XX:-UseLargePagesIndividualAllocation to turn off");
2679 return NULL;
2680 }
2681 p_buf = (char *) VirtualAlloc(addr,
2682 size_of_reserve, // size of Reserve
2683 MEM_RESERVE,
2684 PAGE_READWRITE);
2685 // If reservation failed, return NULL
2686 if (p_buf == NULL) return NULL;
2687
2688 release_memory(p_buf, bytes + _large_page_size);
2689 // round up to page boundary. If the size_of_reserve did not
2690 // overflow and the reservation did not fail, this align up
2691 // should not overflow.
2692 p_buf = (char *) align_size_up((size_t)p_buf, _large_page_size);
2693
2694 // now go through and allocate one page at a time until all bytes are
2695 // allocated
2696 size_t bytes_remaining = align_size_up(bytes, _large_page_size);
2697 // An overflow of align_size_up() would have been caught above
2698 // in the calculation of size_of_reserve.
2699 char * next_alloc_addr = p_buf;
2700
2701 #ifdef ASSERT
2702 // Variable for the failure injection
2703 long ran_num = os::random();
2704 size_t fail_after = ran_num % bytes;
2705 #endif
2706
2707 while (bytes_remaining) {
2708 size_t bytes_to_rq = MIN2(bytes_remaining, _large_page_size);
2709 // Note allocate and commit
2710 char * p_new;
2711
2712 #ifdef ASSERT
2713 bool inject_error = LargePagesIndividualAllocationInjectError &&
2714 (bytes_remaining <= fail_after);
2715 #else
2716 const bool inject_error = false;
2717 #endif
2718
2719 if (inject_error) {
2720 p_new = NULL;
2721 } else {
2722 p_new = (char *) VirtualAlloc(next_alloc_addr,
2723 bytes_to_rq,
2724 MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES,
2725 prot);
2726 }
2727
2728 if (p_new == NULL) {
2729 // Free any allocated pages
2730 if (next_alloc_addr > p_buf) {
2731 // Some memory was committed so release it.
2732 size_t bytes_to_release = bytes - bytes_remaining;
2733 release_memory(p_buf, bytes_to_release);
2734 }
2735 #ifdef ASSERT
2736 if (UseLargePagesIndividualAllocation &&
2737 LargePagesIndividualAllocationInjectError) {
2738 if (TracePageSizes && Verbose) {
2739 tty->print_cr("Reserving large pages individually failed.");
2740 }
2741 }
2742 #endif
2743 return NULL;
2744 }
2745 bytes_remaining -= bytes_to_rq;
2746 next_alloc_addr += bytes_to_rq;
2747 }
2748
2749 return p_buf;
2750
2751 } else {
2752 // normal policy just allocate it all at once
2753 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
2754 char * res = (char *)VirtualAlloc(NULL, bytes, flag, prot);
2755 return res;
2756 }
2757 }
2758
2759 bool os::release_memory_special(char* base, size_t bytes) {
2760 return release_memory(base, bytes);
2761 }
2762
2763 void os::print_statistics() {
2764 }
2765
2766 bool os::commit_memory(char* addr, size_t bytes, bool exec) {
2767 if (bytes == 0) {
2768 // Don't bother the OS with noops.
2769 return true;
2770 }
2771 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
2772 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
2773 // Don't attempt to print anything if the OS call fails. We're
2774 // probably low on resources, so the print itself may cause crashes.
2775 bool result = VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) != 0;
2776 if (result != NULL && exec) {
2777 DWORD oldprot;
2778 // Windows doc says to use VirtualProtect to get execute permissions
2779 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot) != 0;
2780 } else {
2781 return result;
2782 }
2783 }
2784
2785 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint,
2786 bool exec) {
2787 return commit_memory(addr, size, exec);
2788 }
2789
2790 bool os::uncommit_memory(char* addr, size_t bytes) {
2791 if (bytes == 0) {
2792 // Don't bother the OS with noops.
2793 return true;
2794 }
2795 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
2796 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
2797 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0;
2798 }
2799
2800 bool os::release_memory(char* addr, size_t bytes) {
2801 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
2802 }
2803
2804 bool os::create_stack_guard_pages(char* addr, size_t size) {
2805 return os::commit_memory(addr, size);
2806 }
2807
2808 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2809 return os::uncommit_memory(addr, size);
2810 }
2811
2812 // Set protections specified
2813 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2814 bool is_committed) {
2815 unsigned int p = 0;
2816 switch (prot) {
2817 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
2818 case MEM_PROT_READ: p = PAGE_READONLY; break;
2819 case MEM_PROT_RW: p = PAGE_READWRITE; break;
2820 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
2821 default:
2822 ShouldNotReachHere();
2823 }
2824
2825 DWORD old_status;
2826
2827 // Strange enough, but on Win32 one can change protection only for committed
2828 // memory, not a big deal anyway, as bytes less or equal than 64K
2829 if (!is_committed && !commit_memory(addr, bytes, prot == MEM_PROT_RWX)) {
2830 fatal("cannot commit protection page");
2831 }
2832 // One cannot use os::guard_memory() here, as on Win32 guard page
2833 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
2834 //
2835 // Pages in the region become guard pages. Any attempt to access a guard page
2836 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
2837 // the guard page status. Guard pages thus act as a one-time access alarm.
2838 return VirtualProtect(addr, bytes, p, &old_status) != 0;
2839 }
2840
2841 bool os::guard_memory(char* addr, size_t bytes) {
2842 DWORD old_status;
2843 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
2844 }
2845
2846 bool os::unguard_memory(char* addr, size_t bytes) {
2847 DWORD old_status;
2848 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
2849 }
2850
2851 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
2852 void os::free_memory(char *addr, size_t bytes) { }
2853 void os::numa_make_global(char *addr, size_t bytes) { }
2854 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
2855 bool os::numa_topology_changed() { return false; }
2856 size_t os::numa_get_groups_num() { return 1; }
2857 int os::numa_get_group_id() { return 0; }
2858 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2859 if (size > 0) {
2860 ids[0] = 0;
2861 return 1;
2862 }
2863 return 0;
2864 }
2865
2866 bool os::get_page_info(char *start, page_info* info) {
2867 return false;
2868 }
2869
2870 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2871 return end;
2872 }
2873
2874 char* os::non_memory_address_word() {
2875 // Must never look like an address returned by reserve_memory,
2876 // even in its subfields (as defined by the CPU immediate fields,
2877 // if the CPU splits constants across multiple instructions).
2878 return (char*)-1;
2879 }
2880
2881 #define MAX_ERROR_COUNT 100
2882 #define SYS_THREAD_ERROR 0xffffffffUL
2883
2884 void os::pd_start_thread(Thread* thread) {
2885 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
2886 // Returns previous suspend state:
2887 // 0: Thread was not suspended
2888 // 1: Thread is running now
2889 // >1: Thread is still suspended.
2890 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
2891 }
2892
2893 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2894 return ::read(fd, buf, nBytes);
2895 }
2896
2897 class HighResolutionInterval {
2898 // The default timer resolution seems to be 10 milliseconds.
2899 // (Where is this written down?)
2900 // If someone wants to sleep for only a fraction of the default,
2901 // then we set the timer resolution down to 1 millisecond for
2902 // the duration of their interval.
2903 // We carefully set the resolution back, since otherwise we
2904 // seem to incur an overhead (3%?) that we don't need.
2905 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
2906 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
2907 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
2908 // timeBeginPeriod() if the relative error exceeded some threshold.
2909 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
2910 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
2911 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
2912 // resolution timers running.
2913 private:
2914 jlong resolution;
2915 public:
2916 HighResolutionInterval(jlong ms) {
2917 resolution = ms % 10L;
2918 if (resolution != 0) {
2919 MMRESULT result = timeBeginPeriod(1L);
2920 }
2921 }
2922 ~HighResolutionInterval() {
2923 if (resolution != 0) {
2924 MMRESULT result = timeEndPeriod(1L);
2925 }
2926 resolution = 0L;
2927 }
2928 };
2929
2930 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
2931 jlong limit = (jlong) MAXDWORD;
2932
2933 while(ms > limit) {
2934 int res;
2935 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
2936 return res;
2937 ms -= limit;
2938 }
2939
2940 assert(thread == Thread::current(), "thread consistency check");
2941 OSThread* osthread = thread->osthread();
2942 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
2943 int result;
2944 if (interruptable) {
2945 assert(thread->is_Java_thread(), "must be java thread");
2946 JavaThread *jt = (JavaThread *) thread;
2947 ThreadBlockInVM tbivm(jt);
2948
2949 jt->set_suspend_equivalent();
2950 // cleared by handle_special_suspend_equivalent_condition() or
2951 // java_suspend_self() via check_and_wait_while_suspended()
2952
2953 HANDLE events[1];
2954 events[0] = osthread->interrupt_event();
2955 HighResolutionInterval *phri=NULL;
2956 if(!ForceTimeHighResolution)
2957 phri = new HighResolutionInterval( ms );
2958 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
2959 result = OS_TIMEOUT;
2960 } else {
2961 ResetEvent(osthread->interrupt_event());
2962 osthread->set_interrupted(false);
2963 result = OS_INTRPT;
2964 }
2965 delete phri; //if it is NULL, harmless
2966
2967 // were we externally suspended while we were waiting?
2968 jt->check_and_wait_while_suspended();
2969 } else {
2970 assert(!thread->is_Java_thread(), "must not be java thread");
2971 Sleep((long) ms);
2972 result = OS_TIMEOUT;
2973 }
2974 return result;
2975 }
2976
2977 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2978 void os::infinite_sleep() {
2979 while (true) { // sleep forever ...
2980 Sleep(100000); // ... 100 seconds at a time
2981 }
2982 }
2983
2984 typedef BOOL (WINAPI * STTSignature)(void) ;
2985
2986 os::YieldResult os::NakedYield() {
2987 // Use either SwitchToThread() or Sleep(0)
2988 // Consider passing back the return value from SwitchToThread().
2989 // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread.
2990 // In that case we revert to Sleep(0).
2991 static volatile STTSignature stt = (STTSignature) 1 ;
2992
2993 if (stt == ((STTSignature) 1)) {
2994 stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ;
2995 // It's OK if threads race during initialization as the operation above is idempotent.
2996 }
2997 if (stt != NULL) {
2998 return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
2999 } else {
3000 Sleep (0) ;
3001 }
3002 return os::YIELD_UNKNOWN ;
3003 }
3004
3005 void os::yield() { os::NakedYield(); }
3006
3007 void os::yield_all(int attempts) {
3008 // Yields to all threads, including threads with lower priorities
3009 Sleep(1);
3010 }
3011
3012 // Win32 only gives you access to seven real priorities at a time,
3013 // so we compress Java's ten down to seven. It would be better
3014 // if we dynamically adjusted relative priorities.
3015
3016 int os::java_to_os_priority[MaxPriority + 1] = {
3017 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3018 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3019 THREAD_PRIORITY_LOWEST, // 2
3020 THREAD_PRIORITY_BELOW_NORMAL, // 3
3021 THREAD_PRIORITY_BELOW_NORMAL, // 4
3022 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3023 THREAD_PRIORITY_NORMAL, // 6
3024 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3025 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3026 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3027 THREAD_PRIORITY_HIGHEST // 10 MaxPriority
3028 };
3029
3030 int prio_policy1[MaxPriority + 1] = {
3031 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3032 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3033 THREAD_PRIORITY_LOWEST, // 2
3034 THREAD_PRIORITY_BELOW_NORMAL, // 3
3035 THREAD_PRIORITY_BELOW_NORMAL, // 4
3036 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3037 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3038 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3039 THREAD_PRIORITY_HIGHEST, // 8
3040 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3041 THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority
3042 };
3043
3044 static int prio_init() {
3045 // If ThreadPriorityPolicy is 1, switch tables
3046 if (ThreadPriorityPolicy == 1) {
3047 int i;
3048 for (i = 0; i < MaxPriority + 1; i++) {
3049 os::java_to_os_priority[i] = prio_policy1[i];
3050 }
3051 }
3052 return 0;
3053 }
3054
3055 OSReturn os::set_native_priority(Thread* thread, int priority) {
3056 if (!UseThreadPriorities) return OS_OK;
3057 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3058 return ret ? OS_OK : OS_ERR;
3059 }
3060
3061 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3062 if ( !UseThreadPriorities ) {
3063 *priority_ptr = java_to_os_priority[NormPriority];
3064 return OS_OK;
3065 }
3066 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3067 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3068 assert(false, "GetThreadPriority failed");
3069 return OS_ERR;
3070 }
3071 *priority_ptr = os_prio;
3072 return OS_OK;
3073 }
3074
3075
3076 // Hint to the underlying OS that a task switch would not be good.
3077 // Void return because it's a hint and can fail.
3078 void os::hint_no_preempt() {}
3079
3080 void os::interrupt(Thread* thread) {
3081 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3082 "possibility of dangling Thread pointer");
3083
3084 OSThread* osthread = thread->osthread();
3085 osthread->set_interrupted(true);
3086 // More than one thread can get here with the same value of osthread,
3087 // resulting in multiple notifications. We do, however, want the store
3088 // to interrupted() to be visible to other threads before we post
3089 // the interrupt event.
3090 OrderAccess::release();
3091 SetEvent(osthread->interrupt_event());
3092 // For JSR166: unpark after setting status
3093 if (thread->is_Java_thread())
3094 ((JavaThread*)thread)->parker()->unpark();
3095
3096 ParkEvent * ev = thread->_ParkEvent ;
3097 if (ev != NULL) ev->unpark() ;
3098
3099 }
3100
3101
3102 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3103 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3104 "possibility of dangling Thread pointer");
3105
3106 OSThread* osthread = thread->osthread();
3107 bool interrupted;
3108 interrupted = osthread->interrupted();
3109 if (clear_interrupted == true) {
3110 osthread->set_interrupted(false);
3111 ResetEvent(osthread->interrupt_event());
3112 } // Otherwise leave the interrupted state alone
3113
3114 return interrupted;
3115 }
3116
3117 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3118 ExtendedPC os::get_thread_pc(Thread* thread) {
3119 CONTEXT context;
3120 context.ContextFlags = CONTEXT_CONTROL;
3121 HANDLE handle = thread->osthread()->thread_handle();
3122 #ifdef _M_IA64
3123 assert(0, "Fix get_thread_pc");
3124 return ExtendedPC(NULL);
3125 #else
3126 if (GetThreadContext(handle, &context)) {
3127 #ifdef _M_AMD64
3128 return ExtendedPC((address) context.Rip);
3129 #else
3130 return ExtendedPC((address) context.Eip);
3131 #endif
3132 } else {
3133 return ExtendedPC(NULL);
3134 }
3135 #endif
3136 }
3137
3138 // GetCurrentThreadId() returns DWORD
3139 intx os::current_thread_id() { return GetCurrentThreadId(); }
3140
3141 static int _initial_pid = 0;
3142
3143 int os::current_process_id()
3144 {
3145 return (_initial_pid ? _initial_pid : _getpid());
3146 }
3147
3148 int os::win32::_vm_page_size = 0;
3149 int os::win32::_vm_allocation_granularity = 0;
3150 int os::win32::_processor_type = 0;
3151 // Processor level is not available on non-NT systems, use vm_version instead
3152 int os::win32::_processor_level = 0;
3153 julong os::win32::_physical_memory = 0;
3154 size_t os::win32::_default_stack_size = 0;
3155
3156 intx os::win32::_os_thread_limit = 0;
3157 volatile intx os::win32::_os_thread_count = 0;
3158
3159 bool os::win32::_is_nt = false;
3160 bool os::win32::_is_windows_2003 = false;
3161
3162
3163 void os::win32::initialize_system_info() {
3164 SYSTEM_INFO si;
3165 GetSystemInfo(&si);
3166 _vm_page_size = si.dwPageSize;
3167 _vm_allocation_granularity = si.dwAllocationGranularity;
3168 _processor_type = si.dwProcessorType;
3169 _processor_level = si.wProcessorLevel;
3170 set_processor_count(si.dwNumberOfProcessors);
3171
3172 MEMORYSTATUSEX ms;
3173 ms.dwLength = sizeof(ms);
3174
3175 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3176 // dwMemoryLoad (% of memory in use)
3177 GlobalMemoryStatusEx(&ms);
3178 _physical_memory = ms.ullTotalPhys;
3179
3180 OSVERSIONINFO oi;
3181 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
3182 GetVersionEx(&oi);
3183 switch(oi.dwPlatformId) {
3184 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3185 case VER_PLATFORM_WIN32_NT:
3186 _is_nt = true;
3187 {
3188 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3189 if (os_vers == 5002) {
3190 _is_windows_2003 = true;
3191 }
3192 }
3193 break;
3194 default: fatal("Unknown platform");
3195 }
3196
3197 _default_stack_size = os::current_stack_size();
3198 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3199 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3200 "stack size not a multiple of page size");
3201
3202 initialize_performance_counter();
3203
3204 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3205 // known to deadlock the system, if the VM issues to thread operations with
3206 // a too high frequency, e.g., such as changing the priorities.
3207 // The 6000 seems to work well - no deadlocks has been notices on the test
3208 // programs that we have seen experience this problem.
3209 if (!os::win32::is_nt()) {
3210 StarvationMonitorInterval = 6000;
3211 }
3212 }
3213
3214
3215 void os::win32::setmode_streams() {
3216 _setmode(_fileno(stdin), _O_BINARY);
3217 _setmode(_fileno(stdout), _O_BINARY);
3218 _setmode(_fileno(stderr), _O_BINARY);
3219 }
3220
3221
3222 int os::message_box(const char* title, const char* message) {
3223 int result = MessageBox(NULL, message, title,
3224 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3225 return result == IDYES;
3226 }
3227
3228 int os::allocate_thread_local_storage() {
3229 return TlsAlloc();
3230 }
3231
3232
3233 void os::free_thread_local_storage(int index) {
3234 TlsFree(index);
3235 }
3236
3237
3238 void os::thread_local_storage_at_put(int index, void* value) {
3239 TlsSetValue(index, value);
3240 assert(thread_local_storage_at(index) == value, "Just checking");
3241 }
3242
3243
3244 void* os::thread_local_storage_at(int index) {
3245 return TlsGetValue(index);
3246 }
3247
3248
3249 #ifndef PRODUCT
3250 #ifndef _WIN64
3251 // Helpers to check whether NX protection is enabled
3252 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3253 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3254 pex->ExceptionRecord->NumberParameters > 0 &&
3255 pex->ExceptionRecord->ExceptionInformation[0] ==
3256 EXCEPTION_INFO_EXEC_VIOLATION) {
3257 return EXCEPTION_EXECUTE_HANDLER;
3258 }
3259 return EXCEPTION_CONTINUE_SEARCH;
3260 }
3261
3262 void nx_check_protection() {
3263 // If NX is enabled we'll get an exception calling into code on the stack
3264 char code[] = { (char)0xC3 }; // ret
3265 void *code_ptr = (void *)code;
3266 __try {
3267 __asm call code_ptr
3268 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3269 tty->print_raw_cr("NX protection detected.");
3270 }
3271 }
3272 #endif // _WIN64
3273 #endif // PRODUCT
3274
3275 // this is called _before_ the global arguments have been parsed
3276 void os::init(void) {
3277 _initial_pid = _getpid();
3278
3279 init_random(1234567);
3280
3281 win32::initialize_system_info();
3282 win32::setmode_streams();
3283 init_page_sizes((size_t) win32::vm_page_size());
3284
3285 // For better scalability on MP systems (must be called after initialize_system_info)
3286 #ifndef PRODUCT
3287 if (is_MP()) {
3288 NoYieldsInMicrolock = true;
3289 }
3290 #endif
3291 // This may be overridden later when argument processing is done.
3292 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3293 os::win32::is_windows_2003());
3294
3295 // Initialize main_process and main_thread
3296 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3297 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3298 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3299 fatal("DuplicateHandle failed\n");
3300 }
3301 main_thread_id = (int) GetCurrentThreadId();
3302 }
3303
3304 // To install functions for atexit processing
3305 extern "C" {
3306 static void perfMemory_exit_helper() {
3307 perfMemory_exit();
3308 }
3309 }
3310
3311
3312 // this is called _after_ the global arguments have been parsed
3313 jint os::init_2(void) {
3314 // Allocate a single page and mark it as readable for safepoint polling
3315 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3316 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3317
3318 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3319 guarantee( return_page != NULL, "Commit Failed for polling page");
3320
3321 os::set_polling_page( polling_page );
3322
3323 #ifndef PRODUCT
3324 if( Verbose && PrintMiscellaneous )
3325 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3326 #endif
3327
3328 if (!UseMembar) {
3329 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3330 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3331
3332 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3333 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3334
3335 os::set_memory_serialize_page( mem_serialize_page );
3336
3337 #ifndef PRODUCT
3338 if(Verbose && PrintMiscellaneous)
3339 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3340 #endif
3341 }
3342
3343 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init());
3344
3345 // Setup Windows Exceptions
3346
3347 // On Itanium systems, Structured Exception Handling does not
3348 // work since stack frames must be walkable by the OS. Since
3349 // much of our code is dynamically generated, and we do not have
3350 // proper unwind .xdata sections, the system simply exits
3351 // rather than delivering the exception. To work around
3352 // this we use VectorExceptions instead.
3353 #ifdef _WIN64
3354 if (UseVectoredExceptions) {
3355 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter);
3356 }
3357 #endif
3358
3359 // for debugging float code generation bugs
3360 if (ForceFloatExceptions) {
3361 #ifndef _WIN64
3362 static long fp_control_word = 0;
3363 __asm { fstcw fp_control_word }
3364 // see Intel PPro Manual, Vol. 2, p 7-16
3365 const long precision = 0x20;
3366 const long underflow = 0x10;
3367 const long overflow = 0x08;
3368 const long zero_div = 0x04;
3369 const long denorm = 0x02;
3370 const long invalid = 0x01;
3371 fp_control_word |= invalid;
3372 __asm { fldcw fp_control_word }
3373 #endif
3374 }
3375
3376 // Initialize HPI.
3377 jint hpi_result = hpi::initialize();
3378 if (hpi_result != JNI_OK) { return hpi_result; }
3379
3380 // If stack_commit_size is 0, windows will reserve the default size,
3381 // but only commit a small portion of it.
3382 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3383 size_t default_reserve_size = os::win32::default_stack_size();
3384 size_t actual_reserve_size = stack_commit_size;
3385 if (stack_commit_size < default_reserve_size) {
3386 // If stack_commit_size == 0, we want this too
3387 actual_reserve_size = default_reserve_size;
3388 }
3389
3390 JavaThread::set_stack_size_at_create(stack_commit_size);
3391
3392 // Calculate theoretical max. size of Threads to guard gainst artifical
3393 // out-of-memory situations, where all available address-space has been
3394 // reserved by thread stacks.
3395 assert(actual_reserve_size != 0, "Must have a stack");
3396
3397 // Calculate the thread limit when we should start doing Virtual Memory
3398 // banging. Currently when the threads will have used all but 200Mb of space.
3399 //
3400 // TODO: consider performing a similar calculation for commit size instead
3401 // as reserve size, since on a 64-bit platform we'll run into that more
3402 // often than running out of virtual memory space. We can use the
3403 // lower value of the two calculations as the os_thread_limit.
3404 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3405 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3406
3407 // at exit methods are called in the reverse order of their registration.
3408 // there is no limit to the number of functions registered. atexit does
3409 // not set errno.
3410
3411 if (PerfAllowAtExitRegistration) {
3412 // only register atexit functions if PerfAllowAtExitRegistration is set.
3413 // atexit functions can be delayed until process exit time, which
3414 // can be problematic for embedded VM situations. Embedded VMs should
3415 // call DestroyJavaVM() to assure that VM resources are released.
3416
3417 // note: perfMemory_exit_helper atexit function may be removed in
3418 // the future if the appropriate cleanup code can be added to the
3419 // VM_Exit VMOperation's doit method.
3420 if (atexit(perfMemory_exit_helper) != 0) {
3421 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3422 }
3423 }
3424
3425 // initialize PSAPI or ToolHelp for fatal error handler
3426 if (win32::is_nt()) _init_psapi();
3427 else _init_toolhelp();
3428
3429 #ifndef _WIN64
3430 // Print something if NX is enabled (win32 on AMD64)
3431 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
3432 #endif
3433
3434 // initialize thread priority policy
3435 prio_init();
3436
3437 if (UseNUMA && !ForceNUMA) {
3438 UseNUMA = false; // Currently unsupported.
3439 }
3440
3441 return JNI_OK;
3442 }
3443
3444 void os::init_3(void) {
3445 return;
3446 }
3447
3448 // Mark the polling page as unreadable
3449 void os::make_polling_page_unreadable(void) {
3450 DWORD old_status;
3451 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
3452 fatal("Could not disable polling page");
3453 };
3454
3455 // Mark the polling page as readable
3456 void os::make_polling_page_readable(void) {
3457 DWORD old_status;
3458 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
3459 fatal("Could not enable polling page");
3460 };
3461
3462
3463 int os::stat(const char *path, struct stat *sbuf) {
3464 char pathbuf[MAX_PATH];
3465 if (strlen(path) > MAX_PATH - 1) {
3466 errno = ENAMETOOLONG;
3467 return -1;
3468 }
3469 hpi::native_path(strcpy(pathbuf, path));
3470 int ret = ::stat(pathbuf, sbuf);
3471 if (sbuf != NULL && UseUTCFileTimestamp) {
3472 // Fix for 6539723. st_mtime returned from stat() is dependent on
3473 // the system timezone and so can return different values for the
3474 // same file if/when daylight savings time changes. This adjustment
3475 // makes sure the same timestamp is returned regardless of the TZ.
3476 //
3477 // See:
3478 // http://msdn.microsoft.com/library/
3479 // default.asp?url=/library/en-us/sysinfo/base/
3480 // time_zone_information_str.asp
3481 // and
3482 // http://msdn.microsoft.com/library/default.asp?url=
3483 // /library/en-us/sysinfo/base/settimezoneinformation.asp
3484 //
3485 // NOTE: there is a insidious bug here: If the timezone is changed
3486 // after the call to stat() but before 'GetTimeZoneInformation()', then
3487 // the adjustment we do here will be wrong and we'll return the wrong
3488 // value (which will likely end up creating an invalid class data
3489 // archive). Absent a better API for this, or some time zone locking
3490 // mechanism, we'll have to live with this risk.
3491 TIME_ZONE_INFORMATION tz;
3492 DWORD tzid = GetTimeZoneInformation(&tz);
3493 int daylightBias =
3494 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
3495 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
3496 }
3497 return ret;
3498 }
3499
3500
3501 #define FT2INT64(ft) \
3502 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
3503
3504
3505 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3506 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3507 // of a thread.
3508 //
3509 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3510 // the fast estimate available on the platform.
3511
3512 // current_thread_cpu_time() is not optimized for Windows yet
3513 jlong os::current_thread_cpu_time() {
3514 // return user + sys since the cost is the same
3515 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
3516 }
3517
3518 jlong os::thread_cpu_time(Thread* thread) {
3519 // consistent with what current_thread_cpu_time() returns.
3520 return os::thread_cpu_time(thread, true /* user+sys */);
3521 }
3522
3523 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3524 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3525 }
3526
3527 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
3528 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
3529 // If this function changes, os::is_thread_cpu_time_supported() should too
3530 if (os::win32::is_nt()) {
3531 FILETIME CreationTime;
3532 FILETIME ExitTime;
3533 FILETIME KernelTime;
3534 FILETIME UserTime;
3535
3536 if ( GetThreadTimes(thread->osthread()->thread_handle(),
3537 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3538 return -1;
3539 else
3540 if (user_sys_cpu_time) {
3541 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
3542 } else {
3543 return FT2INT64(UserTime) * 100;
3544 }
3545 } else {
3546 return (jlong) timeGetTime() * 1000000;
3547 }
3548 }
3549
3550 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3551 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3552 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3553 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3554 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3555 }
3556
3557 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3558 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3559 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3560 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3561 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3562 }
3563
3564 bool os::is_thread_cpu_time_supported() {
3565 // see os::thread_cpu_time
3566 if (os::win32::is_nt()) {
3567 FILETIME CreationTime;
3568 FILETIME ExitTime;
3569 FILETIME KernelTime;
3570 FILETIME UserTime;
3571
3572 if ( GetThreadTimes(GetCurrentThread(),
3573 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3574 return false;
3575 else
3576 return true;
3577 } else {
3578 return false;
3579 }
3580 }
3581
3582 // Windows does't provide a loadavg primitive so this is stubbed out for now.
3583 // It does have primitives (PDH API) to get CPU usage and run queue length.
3584 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
3585 // If we wanted to implement loadavg on Windows, we have a few options:
3586 //
3587 // a) Query CPU usage and run queue length and "fake" an answer by
3588 // returning the CPU usage if it's under 100%, and the run queue
3589 // length otherwise. It turns out that querying is pretty slow
3590 // on Windows, on the order of 200 microseconds on a fast machine.
3591 // Note that on the Windows the CPU usage value is the % usage
3592 // since the last time the API was called (and the first call
3593 // returns 100%), so we'd have to deal with that as well.
3594 //
3595 // b) Sample the "fake" answer using a sampling thread and store
3596 // the answer in a global variable. The call to loadavg would
3597 // just return the value of the global, avoiding the slow query.
3598 //
3599 // c) Sample a better answer using exponential decay to smooth the
3600 // value. This is basically the algorithm used by UNIX kernels.
3601 //
3602 // Note that sampling thread starvation could affect both (b) and (c).
3603 int os::loadavg(double loadavg[], int nelem) {
3604 return -1;
3605 }
3606
3607
3608 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
3609 bool os::dont_yield() {
3610 return DontYieldALot;
3611 }
3612
3613 // Is a (classpath) directory empty?
3614 bool os::dir_is_empty(const char* path) {
3615 WIN32_FIND_DATA fd;
3616 HANDLE f = FindFirstFile(path, &fd);
3617 if (f == INVALID_HANDLE_VALUE) {
3618 return true;
3619 }
3620 FindClose(f);
3621 return false;
3622 }
3623
3624 // create binary file, rewriting existing file if required
3625 int os::create_binary_file(const char* path, bool rewrite_existing) {
3626 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
3627 if (!rewrite_existing) {
3628 oflags |= _O_EXCL;
3629 }
3630 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
3631 }
3632
3633 // return current position of file pointer
3634 jlong os::current_file_offset(int fd) {
3635 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
3636 }
3637
3638 // move file pointer to the specified offset
3639 jlong os::seek_to_file_offset(int fd, jlong offset) {
3640 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
3641 }
3642
3643
3644 // Map a block of memory.
3645 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
3646 char *addr, size_t bytes, bool read_only,
3647 bool allow_exec) {
3648 HANDLE hFile;
3649 char* base;
3650
3651 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
3652 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
3653 if (hFile == NULL) {
3654 if (PrintMiscellaneous && Verbose) {
3655 DWORD err = GetLastError();
3656 tty->print_cr("CreateFile() failed: GetLastError->%ld.");
3657 }
3658 return NULL;
3659 }
3660
3661 if (allow_exec) {
3662 // CreateFileMapping/MapViewOfFileEx can't map executable memory
3663 // unless it comes from a PE image (which the shared archive is not.)
3664 // Even VirtualProtect refuses to give execute access to mapped memory
3665 // that was not previously executable.
3666 //
3667 // Instead, stick the executable region in anonymous memory. Yuck.
3668 // Penalty is that ~4 pages will not be shareable - in the future
3669 // we might consider DLLizing the shared archive with a proper PE
3670 // header so that mapping executable + sharing is possible.
3671
3672 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
3673 PAGE_READWRITE);
3674 if (base == NULL) {
3675 if (PrintMiscellaneous && Verbose) {
3676 DWORD err = GetLastError();
3677 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
3678 }
3679 CloseHandle(hFile);
3680 return NULL;
3681 }
3682
3683 DWORD bytes_read;
3684 OVERLAPPED overlapped;
3685 overlapped.Offset = (DWORD)file_offset;
3686 overlapped.OffsetHigh = 0;
3687 overlapped.hEvent = NULL;
3688 // ReadFile guarantees that if the return value is true, the requested
3689 // number of bytes were read before returning.
3690 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
3691 if (!res) {
3692 if (PrintMiscellaneous && Verbose) {
3693 DWORD err = GetLastError();
3694 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
3695 }
3696 release_memory(base, bytes);
3697 CloseHandle(hFile);
3698 return NULL;
3699 }
3700 } else {
3701 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
3702 NULL /*file_name*/);
3703 if (hMap == NULL) {
3704 if (PrintMiscellaneous && Verbose) {
3705 DWORD err = GetLastError();
3706 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.");
3707 }
3708 CloseHandle(hFile);
3709 return NULL;
3710 }
3711
3712 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
3713 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
3714 (DWORD)bytes, addr);
3715 if (base == NULL) {
3716 if (PrintMiscellaneous && Verbose) {
3717 DWORD err = GetLastError();
3718 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
3719 }
3720 CloseHandle(hMap);
3721 CloseHandle(hFile);
3722 return NULL;
3723 }
3724
3725 if (CloseHandle(hMap) == 0) {
3726 if (PrintMiscellaneous && Verbose) {
3727 DWORD err = GetLastError();
3728 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
3729 }
3730 CloseHandle(hFile);
3731 return base;
3732 }
3733 }
3734
3735 if (allow_exec) {
3736 DWORD old_protect;
3737 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
3738 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
3739
3740 if (!res) {
3741 if (PrintMiscellaneous && Verbose) {
3742 DWORD err = GetLastError();
3743 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
3744 }
3745 // Don't consider this a hard error, on IA32 even if the
3746 // VirtualProtect fails, we should still be able to execute
3747 CloseHandle(hFile);
3748 return base;
3749 }
3750 }
3751
3752 if (CloseHandle(hFile) == 0) {
3753 if (PrintMiscellaneous && Verbose) {
3754 DWORD err = GetLastError();
3755 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
3756 }
3757 return base;
3758 }
3759
3760 return base;
3761 }
3762
3763
3764 // Remap a block of memory.
3765 char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
3766 char *addr, size_t bytes, bool read_only,
3767 bool allow_exec) {
3768 // This OS does not allow existing memory maps to be remapped so we
3769 // have to unmap the memory before we remap it.
3770 if (!os::unmap_memory(addr, bytes)) {
3771 return NULL;
3772 }
3773
3774 // There is a very small theoretical window between the unmap_memory()
3775 // call above and the map_memory() call below where a thread in native
3776 // code may be able to access an address that is no longer mapped.
3777
3778 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3779 allow_exec);
3780 }
3781
3782
3783 // Unmap a block of memory.
3784 // Returns true=success, otherwise false.
3785
3786 bool os::unmap_memory(char* addr, size_t bytes) {
3787 BOOL result = UnmapViewOfFile(addr);
3788 if (result == 0) {
3789 if (PrintMiscellaneous && Verbose) {
3790 DWORD err = GetLastError();
3791 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
3792 }
3793 return false;
3794 }
3795 return true;
3796 }
3797
3798 void os::pause() {
3799 char filename[MAX_PATH];
3800 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3801 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
3802 } else {
3803 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3804 }
3805
3806 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3807 if (fd != -1) {
3808 struct stat buf;
3809 close(fd);
3810 while (::stat(filename, &buf) == 0) {
3811 Sleep(100);
3812 }
3813 } else {
3814 jio_fprintf(stderr,
3815 "Could not open pause file '%s', continuing immediately.\n", filename);
3816 }
3817 }
3818
3819 // An Event wraps a win32 "CreateEvent" kernel handle.
3820 //
3821 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
3822 //
3823 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
3824 // field, and call CloseHandle() on the win32 event handle. Unpark() would
3825 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
3826 // In addition, an unpark() operation might fetch the handle field, but the
3827 // event could recycle between the fetch and the SetEvent() operation.
3828 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
3829 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
3830 // on an stale but recycled handle would be harmless, but in practice this might
3831 // confuse other non-Sun code, so it's not a viable approach.
3832 //
3833 // 2: Once a win32 event handle is associated with an Event, it remains associated
3834 // with the Event. The event handle is never closed. This could be construed
3835 // as handle leakage, but only up to the maximum # of threads that have been extant
3836 // at any one time. This shouldn't be an issue, as windows platforms typically
3837 // permit a process to have hundreds of thousands of open handles.
3838 //
3839 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
3840 // and release unused handles.
3841 //
3842 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
3843 // It's not clear, however, that we wouldn't be trading one type of leak for another.
3844 //
3845 // 5. Use an RCU-like mechanism (Read-Copy Update).
3846 // Or perhaps something similar to Maged Michael's "Hazard pointers".
3847 //
3848 // We use (2).
3849 //
3850 // TODO-FIXME:
3851 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
3852 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
3853 // to recover from (or at least detect) the dreaded Windows 841176 bug.
3854 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
3855 // into a single win32 CreateEvent() handle.
3856 //
3857 // _Event transitions in park()
3858 // -1 => -1 : illegal
3859 // 1 => 0 : pass - return immediately
3860 // 0 => -1 : block
3861 //
3862 // _Event serves as a restricted-range semaphore :
3863 // -1 : thread is blocked
3864 // 0 : neutral - thread is running or ready
3865 // 1 : signaled - thread is running or ready
3866 //
3867 // Another possible encoding of _Event would be
3868 // with explicit "PARKED" and "SIGNALED" bits.
3869
3870 int os::PlatformEvent::park (jlong Millis) {
3871 guarantee (_ParkHandle != NULL , "Invariant") ;
3872 guarantee (Millis > 0 , "Invariant") ;
3873 int v ;
3874
3875 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
3876 // the initial park() operation.
3877
3878 for (;;) {
3879 v = _Event ;
3880 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
3881 }
3882 guarantee ((v == 0) || (v == 1), "invariant") ;
3883 if (v != 0) return OS_OK ;
3884
3885 // Do this the hard way by blocking ...
3886 // TODO: consider a brief spin here, gated on the success of recent
3887 // spin attempts by this thread.
3888 //
3889 // We decompose long timeouts into series of shorter timed waits.
3890 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
3891 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
3892 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
3893 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
3894 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
3895 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
3896 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
3897 // for the already waited time. This policy does not admit any new outcomes.
3898 // In the future, however, we might want to track the accumulated wait time and
3899 // adjust Millis accordingly if we encounter a spurious wakeup.
3900
3901 const int MAXTIMEOUT = 0x10000000 ;
3902 DWORD rv = WAIT_TIMEOUT ;
3903 while (_Event < 0 && Millis > 0) {
3904 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
3905 if (Millis > MAXTIMEOUT) {
3906 prd = MAXTIMEOUT ;
3907 }
3908 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
3909 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
3910 if (rv == WAIT_TIMEOUT) {
3911 Millis -= prd ;
3912 }
3913 }
3914 v = _Event ;
3915 _Event = 0 ;
3916 OrderAccess::fence() ;
3917 // If we encounter a nearly simultanous timeout expiry and unpark()
3918 // we return OS_OK indicating we awoke via unpark().
3919 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
3920 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
3921 }
3922
3923 void os::PlatformEvent::park () {
3924 guarantee (_ParkHandle != NULL, "Invariant") ;
3925 // Invariant: Only the thread associated with the Event/PlatformEvent
3926 // may call park().
3927 int v ;
3928 for (;;) {
3929 v = _Event ;
3930 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
3931 }
3932 guarantee ((v == 0) || (v == 1), "invariant") ;
3933 if (v != 0) return ;
3934
3935 // Do this the hard way by blocking ...
3936 // TODO: consider a brief spin here, gated on the success of recent
3937 // spin attempts by this thread.
3938 while (_Event < 0) {
3939 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
3940 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
3941 }
3942
3943 // Usually we'll find _Event == 0 at this point, but as
3944 // an optional optimization we clear it, just in case can
3945 // multiple unpark() operations drove _Event up to 1.
3946 _Event = 0 ;
3947 OrderAccess::fence() ;
3948 guarantee (_Event >= 0, "invariant") ;
3949 }
3950
3951 void os::PlatformEvent::unpark() {
3952 guarantee (_ParkHandle != NULL, "Invariant") ;
3953 int v ;
3954 for (;;) {
3955 v = _Event ; // Increment _Event if it's < 1.
3956 if (v > 0) {
3957 // If it's already signaled just return.
3958 // The LD of _Event could have reordered or be satisfied
3959 // by a read-aside from this processor's write buffer.
3960 // To avoid problems execute a barrier and then
3961 // ratify the value. A degenerate CAS() would also work.
3962 // Viz., CAS (v+0, &_Event, v) == v).
3963 OrderAccess::fence() ;
3964 if (_Event == v) return ;
3965 continue ;
3966 }
3967 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
3968 }
3969 if (v < 0) {
3970 ::SetEvent (_ParkHandle) ;
3971 }
3972 }
3973
3974
3975 // JSR166
3976 // -------------------------------------------------------
3977
3978 /*
3979 * The Windows implementation of Park is very straightforward: Basic
3980 * operations on Win32 Events turn out to have the right semantics to
3981 * use them directly. We opportunistically resuse the event inherited
3982 * from Monitor.
3983 */
3984
3985
3986 void Parker::park(bool isAbsolute, jlong time) {
3987 guarantee (_ParkEvent != NULL, "invariant") ;
3988 // First, demultiplex/decode time arguments
3989 if (time < 0) { // don't wait
3990 return;
3991 }
3992 else if (time == 0) {
3993 time = INFINITE;
3994 }
3995 else if (isAbsolute) {
3996 time -= os::javaTimeMillis(); // convert to relative time
3997 if (time <= 0) // already elapsed
3998 return;
3999 }
4000 else { // relative
4001 time /= 1000000; // Must coarsen from nanos to millis
4002 if (time == 0) // Wait for the minimal time unit if zero
4003 time = 1;
4004 }
4005
4006 JavaThread* thread = (JavaThread*)(Thread::current());
4007 assert(thread->is_Java_thread(), "Must be JavaThread");
4008 JavaThread *jt = (JavaThread *)thread;
4009
4010 // Don't wait if interrupted or already triggered
4011 if (Thread::is_interrupted(thread, false) ||
4012 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4013 ResetEvent(_ParkEvent);
4014 return;
4015 }
4016 else {
4017 ThreadBlockInVM tbivm(jt);
4018 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4019 jt->set_suspend_equivalent();
4020
4021 WaitForSingleObject(_ParkEvent, time);
4022 ResetEvent(_ParkEvent);
4023
4024 // If externally suspended while waiting, re-suspend
4025 if (jt->handle_special_suspend_equivalent_condition()) {
4026 jt->java_suspend_self();
4027 }
4028 }
4029 }
4030
4031 void Parker::unpark() {
4032 guarantee (_ParkEvent != NULL, "invariant") ;
4033 SetEvent(_ParkEvent);
4034 }
4035
4036 // Run the specified command in a separate process. Return its exit value,
4037 // or -1 on failure (e.g. can't create a new process).
4038 int os::fork_and_exec(char* cmd) {
4039 STARTUPINFO si;
4040 PROCESS_INFORMATION pi;
4041
4042 memset(&si, 0, sizeof(si));
4043 si.cb = sizeof(si);
4044 memset(&pi, 0, sizeof(pi));
4045 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4046 cmd, // command line
4047 NULL, // process security attribute
4048 NULL, // thread security attribute
4049 TRUE, // inherits system handles
4050 0, // no creation flags
4051 NULL, // use parent's environment block
4052 NULL, // use parent's starting directory
4053 &si, // (in) startup information
4054 &pi); // (out) process information
4055
4056 if (rslt) {
4057 // Wait until child process exits.
4058 WaitForSingleObject(pi.hProcess, INFINITE);
4059
4060 DWORD exit_code;
4061 GetExitCodeProcess(pi.hProcess, &exit_code);
4062
4063 // Close process and thread handles.
4064 CloseHandle(pi.hProcess);
4065 CloseHandle(pi.hThread);
4066
4067 return (int)exit_code;
4068 } else {
4069 return -1;
4070 }
4071 }
4072
4073 //--------------------------------------------------------------------------------------------------
4074 // Non-product code
4075
4076 static int mallocDebugIntervalCounter = 0;
4077 static int mallocDebugCounter = 0;
4078 bool os::check_heap(bool force) {
4079 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
4080 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
4081 // Note: HeapValidate executes two hardware breakpoints when it finds something
4082 // wrong; at these points, eax contains the address of the offending block (I think).
4083 // To get to the exlicit error message(s) below, just continue twice.
4084 HANDLE heap = GetProcessHeap();
4085 { HeapLock(heap);
4086 PROCESS_HEAP_ENTRY phe;
4087 phe.lpData = NULL;
4088 while (HeapWalk(heap, &phe) != 0) {
4089 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
4090 !HeapValidate(heap, 0, phe.lpData)) {
4091 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
4092 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
4093 fatal("corrupted C heap");
4094 }
4095 }
4096 int err = GetLastError();
4097 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
4098 fatal(err_msg("heap walk aborted with error %d", err));
4099 }
4100 HeapUnlock(heap);
4101 }
4102 mallocDebugIntervalCounter = 0;
4103 }
4104 return true;
4105 }
4106
4107
4108 bool os::find(address addr, outputStream* st) {
4109 // Nothing yet
4110 return false;
4111 }
4112
4113 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
4114 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
4115
4116 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
4117 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
4118 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
4119 address addr = (address) exceptionRecord->ExceptionInformation[1];
4120
4121 if (os::is_memory_serialize_page(thread, addr))
4122 return EXCEPTION_CONTINUE_EXECUTION;
4123 }
4124
4125 return EXCEPTION_CONTINUE_SEARCH;
4126 }
4127
4128 static int getLastErrorString(char *buf, size_t len)
4129 {
4130 long errval;
4131
4132 if ((errval = GetLastError()) != 0)
4133 {
4134 /* DOS error */
4135 size_t n = (size_t)FormatMessage(
4136 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
4137 NULL,
4138 errval,
4139 0,
4140 buf,
4141 (DWORD)len,
4142 NULL);
4143 if (n > 3) {
4144 /* Drop final '.', CR, LF */
4145 if (buf[n - 1] == '\n') n--;
4146 if (buf[n - 1] == '\r') n--;
4147 if (buf[n - 1] == '.') n--;
4148 buf[n] = '\0';
4149 }
4150 return (int)n;
4151 }
4152
4153 if (errno != 0)
4154 {
4155 /* C runtime error that has no corresponding DOS error code */
4156 const char *s = strerror(errno);
4157 size_t n = strlen(s);
4158 if (n >= len) n = len - 1;
4159 strncpy(buf, s, n);
4160 buf[n] = '\0';
4161 return (int)n;
4162 }
4163 return 0;
4164 }
4165
4166
4167 // We don't build a headless jre for Windows
4168 bool os::is_headless_jre() { return false; }
4169