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 // flush buffered output, finish log files
861 ostream_abort();
862
863 // Check for abort hook
864 abort_hook_t abort_hook = Arguments::abort_hook();
865 if (abort_hook != NULL) {
866 abort_hook();
867 }
868 }
869
870 void os::abort(bool dump_core)
871 {
872 os::shutdown();
873 // no core dump on Windows
874 ::exit(1);
875 }
876
877 // Die immediately, no exit hook, no abort hook, no cleanup.
878 void os::die() {
879 _exit(-1);
880 }
881
882 // Directory routines copied from src/win32/native/java/io/dirent_md.c
883 // * dirent_md.c 1.15 00/02/02
884 //
885 // The declarations for DIR and struct dirent are in jvm_win32.h.
886
887 /* Caller must have already run dirname through JVM_NativePath, which removes
888 duplicate slashes and converts all instances of '/' into '\\'. */
889
890 DIR *
891 os::opendir(const char *dirname)
892 {
893 assert(dirname != NULL, "just checking"); // hotspot change
894 DIR *dirp = (DIR *)malloc(sizeof(DIR));
895 DWORD fattr; // hotspot change
896 char alt_dirname[4] = { 0, 0, 0, 0 };
897
898 if (dirp == 0) {
899 errno = ENOMEM;
900 return 0;
901 }
902
903 /*
904 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
905 * as a directory in FindFirstFile(). We detect this case here and
906 * prepend the current drive name.
907 */
908 if (dirname[1] == '\0' && dirname[0] == '\\') {
909 alt_dirname[0] = _getdrive() + 'A' - 1;
910 alt_dirname[1] = ':';
911 alt_dirname[2] = '\\';
912 alt_dirname[3] = '\0';
913 dirname = alt_dirname;
914 }
915
916 dirp->path = (char *)malloc(strlen(dirname) + 5);
917 if (dirp->path == 0) {
918 free(dirp);
919 errno = ENOMEM;
920 return 0;
921 }
922 strcpy(dirp->path, dirname);
923
924 fattr = GetFileAttributes(dirp->path);
925 if (fattr == 0xffffffff) {
926 free(dirp->path);
927 free(dirp);
928 errno = ENOENT;
929 return 0;
930 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
931 free(dirp->path);
932 free(dirp);
933 errno = ENOTDIR;
934 return 0;
935 }
936
937 /* Append "*.*", or possibly "\\*.*", to path */
938 if (dirp->path[1] == ':'
939 && (dirp->path[2] == '\0'
940 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
941 /* No '\\' needed for cases like "Z:" or "Z:\" */
942 strcat(dirp->path, "*.*");
943 } else {
944 strcat(dirp->path, "\\*.*");
945 }
946
947 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
948 if (dirp->handle == INVALID_HANDLE_VALUE) {
949 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
950 free(dirp->path);
951 free(dirp);
952 errno = EACCES;
953 return 0;
954 }
955 }
956 return dirp;
957 }
958
959 /* parameter dbuf unused on Windows */
960
961 struct dirent *
962 os::readdir(DIR *dirp, dirent *dbuf)
963 {
964 assert(dirp != NULL, "just checking"); // hotspot change
965 if (dirp->handle == INVALID_HANDLE_VALUE) {
966 return 0;
967 }
968
969 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
970
971 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
972 if (GetLastError() == ERROR_INVALID_HANDLE) {
973 errno = EBADF;
974 return 0;
975 }
976 FindClose(dirp->handle);
977 dirp->handle = INVALID_HANDLE_VALUE;
978 }
979
980 return &dirp->dirent;
981 }
982
983 int
984 os::closedir(DIR *dirp)
985 {
986 assert(dirp != NULL, "just checking"); // hotspot change
987 if (dirp->handle != INVALID_HANDLE_VALUE) {
988 if (!FindClose(dirp->handle)) {
989 errno = EBADF;
990 return -1;
991 }
992 dirp->handle = INVALID_HANDLE_VALUE;
993 }
994 free(dirp->path);
995 free(dirp);
996 return 0;
997 }
998
999 const char* os::dll_file_extension() { return ".dll"; }
1000
1001 const char* os::get_temp_directory() {
1002 const char *prop = Arguments::get_property("java.io.tmpdir");
1003 if (prop != 0) return prop;
1004 static char path_buf[MAX_PATH];
1005 if (GetTempPath(MAX_PATH, path_buf)>0)
1006 return path_buf;
1007 else{
1008 path_buf[0]='\0';
1009 return path_buf;
1010 }
1011 }
1012
1013 static bool file_exists(const char* filename) {
1014 if (filename == NULL || strlen(filename) == 0) {
1015 return false;
1016 }
1017 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1018 }
1019
1020 void os::dll_build_name(char *buffer, size_t buflen,
1021 const char* pname, const char* fname) {
1022 // Copied from libhpi
1023 const size_t pnamelen = pname ? strlen(pname) : 0;
1024 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1025
1026 // Quietly truncates on buffer overflow. Should be an error.
1027 if (pnamelen + strlen(fname) + 10 > buflen) {
1028 *buffer = '\0';
1029 return;
1030 }
1031
1032 if (pnamelen == 0) {
1033 jio_snprintf(buffer, buflen, "%s.dll", fname);
1034 } else if (c == ':' || c == '\\') {
1035 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1036 } else if (strchr(pname, *os::path_separator()) != NULL) {
1037 int n;
1038 char** pelements = split_path(pname, &n);
1039 for (int i = 0 ; i < n ; i++) {
1040 char* path = pelements[i];
1041 // Really shouldn't be NULL, but check can't hurt
1042 size_t plen = (path == NULL) ? 0 : strlen(path);
1043 if (plen == 0) {
1044 continue; // skip the empty path values
1045 }
1046 const char lastchar = path[plen - 1];
1047 if (lastchar == ':' || lastchar == '\\') {
1048 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1049 } else {
1050 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1051 }
1052 if (file_exists(buffer)) {
1053 break;
1054 }
1055 }
1056 // release the storage
1057 for (int i = 0 ; i < n ; i++) {
1058 if (pelements[i] != NULL) {
1059 FREE_C_HEAP_ARRAY(char, pelements[i]);
1060 }
1061 }
1062 if (pelements != NULL) {
1063 FREE_C_HEAP_ARRAY(char*, pelements);
1064 }
1065 } else {
1066 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1067 }
1068 }
1069
1070 // Needs to be in os specific directory because windows requires another
1071 // header file <direct.h>
1072 const char* os::get_current_directory(char *buf, int buflen) {
1073 return _getcwd(buf, buflen);
1074 }
1075
1076 //-----------------------------------------------------------
1077 // Helper functions for fatal error handler
1078
1079 // The following library functions are resolved dynamically at runtime:
1080
1081 // PSAPI functions, for Windows NT, 2000, XP
1082
1083 // psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform
1084 // SDK from Microsoft. Here are the definitions copied from psapi.h
1085 typedef struct _MODULEINFO {
1086 LPVOID lpBaseOfDll;
1087 DWORD SizeOfImage;
1088 LPVOID EntryPoint;
1089 } MODULEINFO, *LPMODULEINFO;
1090
1091 static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD );
1092 static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD );
1093 static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD );
1094
1095 // ToolHelp Functions, for Windows 95, 98 and ME
1096
1097 static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ;
1098 static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ;
1099 static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ;
1100
1101 bool _has_psapi;
1102 bool _psapi_init = false;
1103 bool _has_toolhelp;
1104
1105 static bool _init_psapi() {
1106 HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ;
1107 if( psapi == NULL ) return false ;
1108
1109 _EnumProcessModules = CAST_TO_FN_PTR(
1110 BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD),
1111 GetProcAddress(psapi, "EnumProcessModules")) ;
1112 _GetModuleFileNameEx = CAST_TO_FN_PTR(
1113 DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD),
1114 GetProcAddress(psapi, "GetModuleFileNameExA"));
1115 _GetModuleInformation = CAST_TO_FN_PTR(
1116 BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD),
1117 GetProcAddress(psapi, "GetModuleInformation"));
1118
1119 _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation);
1120 _psapi_init = true;
1121 return _has_psapi;
1122 }
1123
1124 static bool _init_toolhelp() {
1125 HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ;
1126 if (kernel32 == NULL) return false ;
1127
1128 _CreateToolhelp32Snapshot = CAST_TO_FN_PTR(
1129 HANDLE(WINAPI *)(DWORD,DWORD),
1130 GetProcAddress(kernel32, "CreateToolhelp32Snapshot"));
1131 _Module32First = CAST_TO_FN_PTR(
1132 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1133 GetProcAddress(kernel32, "Module32First" ));
1134 _Module32Next = CAST_TO_FN_PTR(
1135 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1136 GetProcAddress(kernel32, "Module32Next" ));
1137
1138 _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next);
1139 return _has_toolhelp;
1140 }
1141
1142 #ifdef _WIN64
1143 // Helper routine which returns true if address in
1144 // within the NTDLL address space.
1145 //
1146 static bool _addr_in_ntdll( address addr )
1147 {
1148 HMODULE hmod;
1149 MODULEINFO minfo;
1150
1151 hmod = GetModuleHandle("NTDLL.DLL");
1152 if ( hmod == NULL ) return false;
1153 if ( !_GetModuleInformation( GetCurrentProcess(), hmod,
1154 &minfo, sizeof(MODULEINFO)) )
1155 return false;
1156
1157 if ( (addr >= minfo.lpBaseOfDll) &&
1158 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1159 return true;
1160 else
1161 return false;
1162 }
1163 #endif
1164
1165
1166 // Enumerate all modules for a given process ID
1167 //
1168 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1169 // different API for doing this. We use PSAPI.DLL on NT based
1170 // Windows and ToolHelp on 95/98/Me.
1171
1172 // Callback function that is called by enumerate_modules() on
1173 // every DLL module.
1174 // Input parameters:
1175 // int pid,
1176 // char* module_file_name,
1177 // address module_base_addr,
1178 // unsigned module_size,
1179 // void* param
1180 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1181
1182 // enumerate_modules for Windows NT, using PSAPI
1183 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1184 {
1185 HANDLE hProcess ;
1186
1187 # define MAX_NUM_MODULES 128
1188 HMODULE modules[MAX_NUM_MODULES];
1189 static char filename[ MAX_PATH ];
1190 int result = 0;
1191
1192 if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0;
1193
1194 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1195 FALSE, pid ) ;
1196 if (hProcess == NULL) return 0;
1197
1198 DWORD size_needed;
1199 if (!_EnumProcessModules(hProcess, modules,
1200 sizeof(modules), &size_needed)) {
1201 CloseHandle( hProcess );
1202 return 0;
1203 }
1204
1205 // number of modules that are currently loaded
1206 int num_modules = size_needed / sizeof(HMODULE);
1207
1208 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1209 // Get Full pathname:
1210 if(!_GetModuleFileNameEx(hProcess, modules[i],
1211 filename, sizeof(filename))) {
1212 filename[0] = '\0';
1213 }
1214
1215 MODULEINFO modinfo;
1216 if (!_GetModuleInformation(hProcess, modules[i],
1217 &modinfo, sizeof(modinfo))) {
1218 modinfo.lpBaseOfDll = NULL;
1219 modinfo.SizeOfImage = 0;
1220 }
1221
1222 // Invoke callback function
1223 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1224 modinfo.SizeOfImage, param);
1225 if (result) break;
1226 }
1227
1228 CloseHandle( hProcess ) ;
1229 return result;
1230 }
1231
1232
1233 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1234 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1235 {
1236 HANDLE hSnapShot ;
1237 static MODULEENTRY32 modentry ;
1238 int result = 0;
1239
1240 if (!_has_toolhelp) return 0;
1241
1242 // Get a handle to a Toolhelp snapshot of the system
1243 hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1244 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1245 return FALSE ;
1246 }
1247
1248 // iterate through all modules
1249 modentry.dwSize = sizeof(MODULEENTRY32) ;
1250 bool not_done = _Module32First( hSnapShot, &modentry ) != 0;
1251
1252 while( not_done ) {
1253 // invoke the callback
1254 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1255 modentry.modBaseSize, param);
1256 if (result) break;
1257
1258 modentry.dwSize = sizeof(MODULEENTRY32) ;
1259 not_done = _Module32Next( hSnapShot, &modentry ) != 0;
1260 }
1261
1262 CloseHandle(hSnapShot);
1263 return result;
1264 }
1265
1266 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1267 {
1268 // Get current process ID if caller doesn't provide it.
1269 if (!pid) pid = os::current_process_id();
1270
1271 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1272 else return _enumerate_modules_windows(pid, func, param);
1273 }
1274
1275 struct _modinfo {
1276 address addr;
1277 char* full_path; // point to a char buffer
1278 int buflen; // size of the buffer
1279 address base_addr;
1280 };
1281
1282 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1283 unsigned size, void * param) {
1284 struct _modinfo *pmod = (struct _modinfo *)param;
1285 if (!pmod) return -1;
1286
1287 if (base_addr <= pmod->addr &&
1288 base_addr+size > pmod->addr) {
1289 // if a buffer is provided, copy path name to the buffer
1290 if (pmod->full_path) {
1291 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1292 }
1293 pmod->base_addr = base_addr;
1294 return 1;
1295 }
1296 return 0;
1297 }
1298
1299 bool os::dll_address_to_library_name(address addr, char* buf,
1300 int buflen, int* offset) {
1301 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1302 // return the full path to the DLL file, sometimes it returns path
1303 // to the corresponding PDB file (debug info); sometimes it only
1304 // returns partial path, which makes life painful.
1305
1306 struct _modinfo mi;
1307 mi.addr = addr;
1308 mi.full_path = buf;
1309 mi.buflen = buflen;
1310 int pid = os::current_process_id();
1311 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1312 // buf already contains path name
1313 if (offset) *offset = addr - mi.base_addr;
1314 return true;
1315 } else {
1316 if (buf) buf[0] = '\0';
1317 if (offset) *offset = -1;
1318 return false;
1319 }
1320 }
1321
1322 bool os::dll_address_to_function_name(address addr, char *buf,
1323 int buflen, int *offset) {
1324 // Unimplemented on Windows - in order to use SymGetSymFromAddr(),
1325 // we need to initialize imagehlp/dbghelp, then load symbol table
1326 // for every module. That's too much work to do after a fatal error.
1327 // For an example on how to implement this function, see 1.4.2.
1328 if (offset) *offset = -1;
1329 if (buf) buf[0] = '\0';
1330 return false;
1331 }
1332
1333 void* os::dll_lookup(void* handle, const char* name) {
1334 return GetProcAddress((HMODULE)handle, name);
1335 }
1336
1337 // save the start and end address of jvm.dll into param[0] and param[1]
1338 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1339 unsigned size, void * param) {
1340 if (!param) return -1;
1341
1342 if (base_addr <= (address)_locate_jvm_dll &&
1343 base_addr+size > (address)_locate_jvm_dll) {
1344 ((address*)param)[0] = base_addr;
1345 ((address*)param)[1] = base_addr + size;
1346 return 1;
1347 }
1348 return 0;
1349 }
1350
1351 address vm_lib_location[2]; // start and end address of jvm.dll
1352
1353 // check if addr is inside jvm.dll
1354 bool os::address_is_in_vm(address addr) {
1355 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1356 int pid = os::current_process_id();
1357 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1358 assert(false, "Can't find jvm module.");
1359 return false;
1360 }
1361 }
1362
1363 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1364 }
1365
1366 // print module info; param is outputStream*
1367 static int _print_module(int pid, char* fname, address base,
1368 unsigned size, void* param) {
1369 if (!param) return -1;
1370
1371 outputStream* st = (outputStream*)param;
1372
1373 address end_addr = base + size;
1374 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1375 return 0;
1376 }
1377
1378 // Loads .dll/.so and
1379 // in case of error it checks if .dll/.so was built for the
1380 // same architecture as Hotspot is running on
1381 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1382 {
1383 void * result = LoadLibrary(name);
1384 if (result != NULL)
1385 {
1386 return result;
1387 }
1388
1389 long errcode = GetLastError();
1390 if (errcode == ERROR_MOD_NOT_FOUND) {
1391 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1392 ebuf[ebuflen-1]='\0';
1393 return NULL;
1394 }
1395
1396 // Parsing dll below
1397 // If we can read dll-info and find that dll was built
1398 // for an architecture other than Hotspot is running in
1399 // - then print to buffer "DLL was built for a different architecture"
1400 // else call getLastErrorString to obtain system error message
1401
1402 // Read system error message into ebuf
1403 // It may or may not be overwritten below (in the for loop and just above)
1404 getLastErrorString(ebuf, (size_t) ebuflen);
1405 ebuf[ebuflen-1]='\0';
1406 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1407 if (file_descriptor<0)
1408 {
1409 return NULL;
1410 }
1411
1412 uint32_t signature_offset;
1413 uint16_t lib_arch=0;
1414 bool failed_to_get_lib_arch=
1415 (
1416 //Go to position 3c in the dll
1417 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1418 ||
1419 // Read loacation of signature
1420 (sizeof(signature_offset)!=
1421 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1422 ||
1423 //Go to COFF File Header in dll
1424 //that is located after"signature" (4 bytes long)
1425 (os::seek_to_file_offset(file_descriptor,
1426 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1427 ||
1428 //Read field that contains code of architecture
1429 // that dll was build for
1430 (sizeof(lib_arch)!=
1431 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1432 );
1433
1434 ::close(file_descriptor);
1435 if (failed_to_get_lib_arch)
1436 {
1437 // file i/o error - report getLastErrorString(...) msg
1438 return NULL;
1439 }
1440
1441 typedef struct
1442 {
1443 uint16_t arch_code;
1444 char* arch_name;
1445 } arch_t;
1446
1447 static const arch_t arch_array[]={
1448 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1449 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1450 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1451 };
1452 #if (defined _M_IA64)
1453 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1454 #elif (defined _M_AMD64)
1455 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1456 #elif (defined _M_IX86)
1457 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1458 #else
1459 #error Method os::dll_load requires that one of following \
1460 is defined :_M_IA64,_M_AMD64 or _M_IX86
1461 #endif
1462
1463
1464 // Obtain a string for printf operation
1465 // lib_arch_str shall contain string what platform this .dll was built for
1466 // running_arch_str shall string contain what platform Hotspot was built for
1467 char *running_arch_str=NULL,*lib_arch_str=NULL;
1468 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1469 {
1470 if (lib_arch==arch_array[i].arch_code)
1471 lib_arch_str=arch_array[i].arch_name;
1472 if (running_arch==arch_array[i].arch_code)
1473 running_arch_str=arch_array[i].arch_name;
1474 }
1475
1476 assert(running_arch_str,
1477 "Didn't find runing architecture code in arch_array");
1478
1479 // If the architure is right
1480 // but some other error took place - report getLastErrorString(...) msg
1481 if (lib_arch == running_arch)
1482 {
1483 return NULL;
1484 }
1485
1486 if (lib_arch_str!=NULL)
1487 {
1488 ::_snprintf(ebuf, ebuflen-1,
1489 "Can't load %s-bit .dll on a %s-bit platform",
1490 lib_arch_str,running_arch_str);
1491 }
1492 else
1493 {
1494 // don't know what architecture this dll was build for
1495 ::_snprintf(ebuf, ebuflen-1,
1496 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1497 lib_arch,running_arch_str);
1498 }
1499
1500 return NULL;
1501 }
1502
1503
1504 void os::print_dll_info(outputStream *st) {
1505 int pid = os::current_process_id();
1506 st->print_cr("Dynamic libraries:");
1507 enumerate_modules(pid, _print_module, (void *)st);
1508 }
1509
1510 // function pointer to Windows API "GetNativeSystemInfo".
1511 typedef void (WINAPI *GetNativeSystemInfo_func_type)(LPSYSTEM_INFO);
1512 static GetNativeSystemInfo_func_type _GetNativeSystemInfo;
1513
1514 void os::print_os_info(outputStream* st) {
1515 st->print("OS:");
1516
1517 OSVERSIONINFOEX osvi;
1518 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1519 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1520
1521 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1522 st->print_cr("N/A");
1523 return;
1524 }
1525
1526 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1527 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1528 switch (os_vers) {
1529 case 3051: st->print(" Windows NT 3.51"); break;
1530 case 4000: st->print(" Windows NT 4.0"); break;
1531 case 5000: st->print(" Windows 2000"); break;
1532 case 5001: st->print(" Windows XP"); break;
1533 case 5002:
1534 case 6000:
1535 case 6001: {
1536 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1537 // find out whether we are running on 64 bit processor or not.
1538 SYSTEM_INFO si;
1539 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1540 // Check to see if _GetNativeSystemInfo has been initialized.
1541 if (_GetNativeSystemInfo == NULL) {
1542 HMODULE hKernel32 = GetModuleHandle(TEXT("kernel32.dll"));
1543 _GetNativeSystemInfo =
1544 CAST_TO_FN_PTR(GetNativeSystemInfo_func_type,
1545 GetProcAddress(hKernel32,
1546 "GetNativeSystemInfo"));
1547 if (_GetNativeSystemInfo == NULL)
1548 GetSystemInfo(&si);
1549 } else {
1550 _GetNativeSystemInfo(&si);
1551 }
1552 if (os_vers == 5002) {
1553 if (osvi.wProductType == VER_NT_WORKSTATION &&
1554 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1555 st->print(" Windows XP x64 Edition");
1556 else
1557 st->print(" Windows Server 2003 family");
1558 } else if (os_vers == 6000) {
1559 if (osvi.wProductType == VER_NT_WORKSTATION)
1560 st->print(" Windows Vista");
1561 else
1562 st->print(" Windows Server 2008");
1563 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1564 st->print(" , 64 bit");
1565 } else if (os_vers == 6001) {
1566 if (osvi.wProductType == VER_NT_WORKSTATION) {
1567 st->print(" Windows 7");
1568 } else {
1569 // Unrecognized windows, print out its major and minor versions
1570 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1571 }
1572 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1573 st->print(" , 64 bit");
1574 } else { // future os
1575 // Unrecognized windows, print out its major and minor versions
1576 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1577 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1578 st->print(" , 64 bit");
1579 }
1580 break;
1581 }
1582 default: // future windows, print out its major and minor versions
1583 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1584 }
1585 } else {
1586 switch (os_vers) {
1587 case 4000: st->print(" Windows 95"); break;
1588 case 4010: st->print(" Windows 98"); break;
1589 case 4090: st->print(" Windows Me"); break;
1590 default: // future windows, print out its major and minor versions
1591 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1592 }
1593 }
1594 st->print(" Build %d", osvi.dwBuildNumber);
1595 st->print(" %s", osvi.szCSDVersion); // service pack
1596 st->cr();
1597 }
1598
1599 void os::print_memory_info(outputStream* st) {
1600 st->print("Memory:");
1601 st->print(" %dk page", os::vm_page_size()>>10);
1602
1603 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1604 // value if total memory is larger than 4GB
1605 MEMORYSTATUSEX ms;
1606 ms.dwLength = sizeof(ms);
1607 GlobalMemoryStatusEx(&ms);
1608
1609 st->print(", physical %uk", os::physical_memory() >> 10);
1610 st->print("(%uk free)", os::available_memory() >> 10);
1611
1612 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1613 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1614 st->cr();
1615 }
1616
1617 void os::print_siginfo(outputStream *st, void *siginfo) {
1618 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1619 st->print("siginfo:");
1620 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1621
1622 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1623 er->NumberParameters >= 2) {
1624 switch (er->ExceptionInformation[0]) {
1625 case 0: st->print(", reading address"); break;
1626 case 1: st->print(", writing address"); break;
1627 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1628 er->ExceptionInformation[0]);
1629 }
1630 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1631 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1632 er->NumberParameters >= 2 && UseSharedSpaces) {
1633 FileMapInfo* mapinfo = FileMapInfo::current_info();
1634 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1635 st->print("\n\nError accessing class data sharing archive." \
1636 " Mapped file inaccessible during execution, " \
1637 " possible disk/network problem.");
1638 }
1639 } else {
1640 int num = er->NumberParameters;
1641 if (num > 0) {
1642 st->print(", ExceptionInformation=");
1643 for (int i = 0; i < num; i++) {
1644 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1645 }
1646 }
1647 }
1648 st->cr();
1649 }
1650
1651 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1652 // do nothing
1653 }
1654
1655 static char saved_jvm_path[MAX_PATH] = {0};
1656
1657 // Find the full path to the current module, jvm.dll or jvm_g.dll
1658 void os::jvm_path(char *buf, jint buflen) {
1659 // Error checking.
1660 if (buflen < MAX_PATH) {
1661 assert(false, "must use a large-enough buffer");
1662 buf[0] = '\0';
1663 return;
1664 }
1665 // Lazy resolve the path to current module.
1666 if (saved_jvm_path[0] != 0) {
1667 strcpy(buf, saved_jvm_path);
1668 return;
1669 }
1670
1671 GetModuleFileName(vm_lib_handle, buf, buflen);
1672 strcpy(saved_jvm_path, buf);
1673 }
1674
1675
1676 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1677 #ifndef _WIN64
1678 st->print("_");
1679 #endif
1680 }
1681
1682
1683 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1684 #ifndef _WIN64
1685 st->print("@%d", args_size * sizeof(int));
1686 #endif
1687 }
1688
1689 // sun.misc.Signal
1690 // NOTE that this is a workaround for an apparent kernel bug where if
1691 // a signal handler for SIGBREAK is installed then that signal handler
1692 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1693 // See bug 4416763.
1694 static void (*sigbreakHandler)(int) = NULL;
1695
1696 static void UserHandler(int sig, void *siginfo, void *context) {
1697 os::signal_notify(sig);
1698 // We need to reinstate the signal handler each time...
1699 os::signal(sig, (void*)UserHandler);
1700 }
1701
1702 void* os::user_handler() {
1703 return (void*) UserHandler;
1704 }
1705
1706 void* os::signal(int signal_number, void* handler) {
1707 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1708 void (*oldHandler)(int) = sigbreakHandler;
1709 sigbreakHandler = (void (*)(int)) handler;
1710 return (void*) oldHandler;
1711 } else {
1712 return (void*)::signal(signal_number, (void (*)(int))handler);
1713 }
1714 }
1715
1716 void os::signal_raise(int signal_number) {
1717 raise(signal_number);
1718 }
1719
1720 // The Win32 C runtime library maps all console control events other than ^C
1721 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1722 // logoff, and shutdown events. We therefore install our own console handler
1723 // that raises SIGTERM for the latter cases.
1724 //
1725 static BOOL WINAPI consoleHandler(DWORD event) {
1726 switch(event) {
1727 case CTRL_C_EVENT:
1728 if (is_error_reported()) {
1729 // Ctrl-C is pressed during error reporting, likely because the error
1730 // handler fails to abort. Let VM die immediately.
1731 os::die();
1732 }
1733
1734 os::signal_raise(SIGINT);
1735 return TRUE;
1736 break;
1737 case CTRL_BREAK_EVENT:
1738 if (sigbreakHandler != NULL) {
1739 (*sigbreakHandler)(SIGBREAK);
1740 }
1741 return TRUE;
1742 break;
1743 case CTRL_CLOSE_EVENT:
1744 case CTRL_LOGOFF_EVENT:
1745 case CTRL_SHUTDOWN_EVENT:
1746 os::signal_raise(SIGTERM);
1747 return TRUE;
1748 break;
1749 default:
1750 break;
1751 }
1752 return FALSE;
1753 }
1754
1755 /*
1756 * The following code is moved from os.cpp for making this
1757 * code platform specific, which it is by its very nature.
1758 */
1759
1760 // Return maximum OS signal used + 1 for internal use only
1761 // Used as exit signal for signal_thread
1762 int os::sigexitnum_pd(){
1763 return NSIG;
1764 }
1765
1766 // a counter for each possible signal value, including signal_thread exit signal
1767 static volatile jint pending_signals[NSIG+1] = { 0 };
1768 static HANDLE sig_sem;
1769
1770 void os::signal_init_pd() {
1771 // Initialize signal structures
1772 memset((void*)pending_signals, 0, sizeof(pending_signals));
1773
1774 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
1775
1776 // Programs embedding the VM do not want it to attempt to receive
1777 // events like CTRL_LOGOFF_EVENT, which are used to implement the
1778 // shutdown hooks mechanism introduced in 1.3. For example, when
1779 // the VM is run as part of a Windows NT service (i.e., a servlet
1780 // engine in a web server), the correct behavior is for any console
1781 // control handler to return FALSE, not TRUE, because the OS's
1782 // "final" handler for such events allows the process to continue if
1783 // it is a service (while terminating it if it is not a service).
1784 // To make this behavior uniform and the mechanism simpler, we
1785 // completely disable the VM's usage of these console events if -Xrs
1786 // (=ReduceSignalUsage) is specified. This means, for example, that
1787 // the CTRL-BREAK thread dump mechanism is also disabled in this
1788 // case. See bugs 4323062, 4345157, and related bugs.
1789
1790 if (!ReduceSignalUsage) {
1791 // Add a CTRL-C handler
1792 SetConsoleCtrlHandler(consoleHandler, TRUE);
1793 }
1794 }
1795
1796 void os::signal_notify(int signal_number) {
1797 BOOL ret;
1798
1799 Atomic::inc(&pending_signals[signal_number]);
1800 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1801 assert(ret != 0, "ReleaseSemaphore() failed");
1802 }
1803
1804 static int check_pending_signals(bool wait_for_signal) {
1805 DWORD ret;
1806 while (true) {
1807 for (int i = 0; i < NSIG + 1; i++) {
1808 jint n = pending_signals[i];
1809 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1810 return i;
1811 }
1812 }
1813 if (!wait_for_signal) {
1814 return -1;
1815 }
1816
1817 JavaThread *thread = JavaThread::current();
1818
1819 ThreadBlockInVM tbivm(thread);
1820
1821 bool threadIsSuspended;
1822 do {
1823 thread->set_suspend_equivalent();
1824 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1825 ret = ::WaitForSingleObject(sig_sem, INFINITE);
1826 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
1827
1828 // were we externally suspended while we were waiting?
1829 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1830 if (threadIsSuspended) {
1831 //
1832 // The semaphore has been incremented, but while we were waiting
1833 // another thread suspended us. We don't want to continue running
1834 // while suspended because that would surprise the thread that
1835 // suspended us.
1836 //
1837 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1838 assert(ret != 0, "ReleaseSemaphore() failed");
1839
1840 thread->java_suspend_self();
1841 }
1842 } while (threadIsSuspended);
1843 }
1844 }
1845
1846 int os::signal_lookup() {
1847 return check_pending_signals(false);
1848 }
1849
1850 int os::signal_wait() {
1851 return check_pending_signals(true);
1852 }
1853
1854 // Implicit OS exception handling
1855
1856 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
1857 JavaThread* thread = JavaThread::current();
1858 // Save pc in thread
1859 #ifdef _M_IA64
1860 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP);
1861 // Set pc to handler
1862 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
1863 #elif _M_AMD64
1864 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip);
1865 // Set pc to handler
1866 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
1867 #else
1868 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip);
1869 // Set pc to handler
1870 exceptionInfo->ContextRecord->Eip = (LONG)handler;
1871 #endif
1872
1873 // Continue the execution
1874 return EXCEPTION_CONTINUE_EXECUTION;
1875 }
1876
1877
1878 // Used for PostMortemDump
1879 extern "C" void safepoints();
1880 extern "C" void find(int x);
1881 extern "C" void events();
1882
1883 // According to Windows API documentation, an illegal instruction sequence should generate
1884 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
1885 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
1886 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
1887
1888 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
1889
1890 // From "Execution Protection in the Windows Operating System" draft 0.35
1891 // Once a system header becomes available, the "real" define should be
1892 // included or copied here.
1893 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
1894
1895 #define def_excpt(val) #val, val
1896
1897 struct siglabel {
1898 char *name;
1899 int number;
1900 };
1901
1902 struct siglabel exceptlabels[] = {
1903 def_excpt(EXCEPTION_ACCESS_VIOLATION),
1904 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
1905 def_excpt(EXCEPTION_BREAKPOINT),
1906 def_excpt(EXCEPTION_SINGLE_STEP),
1907 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
1908 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
1909 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
1910 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
1911 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
1912 def_excpt(EXCEPTION_FLT_OVERFLOW),
1913 def_excpt(EXCEPTION_FLT_STACK_CHECK),
1914 def_excpt(EXCEPTION_FLT_UNDERFLOW),
1915 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
1916 def_excpt(EXCEPTION_INT_OVERFLOW),
1917 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
1918 def_excpt(EXCEPTION_IN_PAGE_ERROR),
1919 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
1920 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
1921 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
1922 def_excpt(EXCEPTION_STACK_OVERFLOW),
1923 def_excpt(EXCEPTION_INVALID_DISPOSITION),
1924 def_excpt(EXCEPTION_GUARD_PAGE),
1925 def_excpt(EXCEPTION_INVALID_HANDLE),
1926 NULL, 0
1927 };
1928
1929 const char* os::exception_name(int exception_code, char *buf, size_t size) {
1930 for (int i = 0; exceptlabels[i].name != NULL; i++) {
1931 if (exceptlabels[i].number == exception_code) {
1932 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
1933 return buf;
1934 }
1935 }
1936
1937 return NULL;
1938 }
1939
1940 //-----------------------------------------------------------------------------
1941 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
1942 // handle exception caused by idiv; should only happen for -MinInt/-1
1943 // (division by zero is handled explicitly)
1944 #ifdef _M_IA64
1945 assert(0, "Fix Handle_IDiv_Exception");
1946 #elif _M_AMD64
1947 PCONTEXT ctx = exceptionInfo->ContextRecord;
1948 address pc = (address)ctx->Rip;
1949 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
1950 assert(pc[0] == 0xF7, "not an idiv opcode");
1951 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
1952 assert(ctx->Rax == min_jint, "unexpected idiv exception");
1953 // set correct result values and continue after idiv instruction
1954 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
1955 ctx->Rax = (DWORD)min_jint; // result
1956 ctx->Rdx = (DWORD)0; // remainder
1957 // Continue the execution
1958 #else
1959 PCONTEXT ctx = exceptionInfo->ContextRecord;
1960 address pc = (address)ctx->Eip;
1961 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
1962 assert(pc[0] == 0xF7, "not an idiv opcode");
1963 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
1964 assert(ctx->Eax == min_jint, "unexpected idiv exception");
1965 // set correct result values and continue after idiv instruction
1966 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
1967 ctx->Eax = (DWORD)min_jint; // result
1968 ctx->Edx = (DWORD)0; // remainder
1969 // Continue the execution
1970 #endif
1971 return EXCEPTION_CONTINUE_EXECUTION;
1972 }
1973
1974 #ifndef _WIN64
1975 //-----------------------------------------------------------------------------
1976 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
1977 // handle exception caused by native method modifying control word
1978 PCONTEXT ctx = exceptionInfo->ContextRecord;
1979 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
1980
1981 switch (exception_code) {
1982 case EXCEPTION_FLT_DENORMAL_OPERAND:
1983 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
1984 case EXCEPTION_FLT_INEXACT_RESULT:
1985 case EXCEPTION_FLT_INVALID_OPERATION:
1986 case EXCEPTION_FLT_OVERFLOW:
1987 case EXCEPTION_FLT_STACK_CHECK:
1988 case EXCEPTION_FLT_UNDERFLOW:
1989 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
1990 if (fp_control_word != ctx->FloatSave.ControlWord) {
1991 // Restore FPCW and mask out FLT exceptions
1992 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
1993 // Mask out pending FLT exceptions
1994 ctx->FloatSave.StatusWord &= 0xffffff00;
1995 return EXCEPTION_CONTINUE_EXECUTION;
1996 }
1997 }
1998
1999 if (prev_uef_handler != NULL) {
2000 // We didn't handle this exception so pass it to the previous
2001 // UnhandledExceptionFilter.
2002 return (prev_uef_handler)(exceptionInfo);
2003 }
2004
2005 return EXCEPTION_CONTINUE_SEARCH;
2006 }
2007 #else //_WIN64
2008 /*
2009 On Windows, the mxcsr control bits are non-volatile across calls
2010 See also CR 6192333
2011 If EXCEPTION_FLT_* happened after some native method modified
2012 mxcsr - it is not a jvm fault.
2013 However should we decide to restore of mxcsr after a faulty
2014 native method we can uncomment following code
2015 jint MxCsr = INITIAL_MXCSR;
2016 // we can't use StubRoutines::addr_mxcsr_std()
2017 // because in Win64 mxcsr is not saved there
2018 if (MxCsr != ctx->MxCsr) {
2019 ctx->MxCsr = MxCsr;
2020 return EXCEPTION_CONTINUE_EXECUTION;
2021 }
2022
2023 */
2024 #endif //_WIN64
2025
2026
2027 // Fatal error reporting is single threaded so we can make this a
2028 // static and preallocated. If it's more than MAX_PATH silently ignore
2029 // it.
2030 static char saved_error_file[MAX_PATH] = {0};
2031
2032 void os::set_error_file(const char *logfile) {
2033 if (strlen(logfile) <= MAX_PATH) {
2034 strncpy(saved_error_file, logfile, MAX_PATH);
2035 }
2036 }
2037
2038 static inline void report_error(Thread* t, DWORD exception_code,
2039 address addr, void* siginfo, void* context) {
2040 VMError err(t, exception_code, addr, siginfo, context);
2041 err.report_and_die();
2042
2043 // If UseOsErrorReporting, this will return here and save the error file
2044 // somewhere where we can find it in the minidump.
2045 }
2046
2047 //-----------------------------------------------------------------------------
2048 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2049 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2050 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2051 #ifdef _M_IA64
2052 address pc = (address) exceptionInfo->ContextRecord->StIIP;
2053 #elif _M_AMD64
2054 address pc = (address) exceptionInfo->ContextRecord->Rip;
2055 #else
2056 address pc = (address) exceptionInfo->ContextRecord->Eip;
2057 #endif
2058 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2059
2060 #ifndef _WIN64
2061 // Execution protection violation - win32 running on AMD64 only
2062 // Handled first to avoid misdiagnosis as a "normal" access violation;
2063 // This is safe to do because we have a new/unique ExceptionInformation
2064 // code for this condition.
2065 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2066 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2067 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2068 address addr = (address) exceptionRecord->ExceptionInformation[1];
2069
2070 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2071 int page_size = os::vm_page_size();
2072
2073 // Make sure the pc and the faulting address are sane.
2074 //
2075 // If an instruction spans a page boundary, and the page containing
2076 // the beginning of the instruction is executable but the following
2077 // page is not, the pc and the faulting address might be slightly
2078 // different - we still want to unguard the 2nd page in this case.
2079 //
2080 // 15 bytes seems to be a (very) safe value for max instruction size.
2081 bool pc_is_near_addr =
2082 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2083 bool instr_spans_page_boundary =
2084 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2085 (intptr_t) page_size) > 0);
2086
2087 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2088 static volatile address last_addr =
2089 (address) os::non_memory_address_word();
2090
2091 // In conservative mode, don't unguard unless the address is in the VM
2092 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2093 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2094
2095 // Set memory to RWX and retry
2096 address page_start =
2097 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2098 bool res = os::protect_memory((char*) page_start, page_size,
2099 os::MEM_PROT_RWX);
2100
2101 if (PrintMiscellaneous && Verbose) {
2102 char buf[256];
2103 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2104 "at " INTPTR_FORMAT
2105 ", unguarding " INTPTR_FORMAT ": %s", addr,
2106 page_start, (res ? "success" : strerror(errno)));
2107 tty->print_raw_cr(buf);
2108 }
2109
2110 // Set last_addr so if we fault again at the same address, we don't
2111 // end up in an endless loop.
2112 //
2113 // There are two potential complications here. Two threads trapping
2114 // at the same address at the same time could cause one of the
2115 // threads to think it already unguarded, and abort the VM. Likely
2116 // very rare.
2117 //
2118 // The other race involves two threads alternately trapping at
2119 // different addresses and failing to unguard the page, resulting in
2120 // an endless loop. This condition is probably even more unlikely
2121 // than the first.
2122 //
2123 // Although both cases could be avoided by using locks or thread
2124 // local last_addr, these solutions are unnecessary complication:
2125 // this handler is a best-effort safety net, not a complete solution.
2126 // It is disabled by default and should only be used as a workaround
2127 // in case we missed any no-execute-unsafe VM code.
2128
2129 last_addr = addr;
2130
2131 return EXCEPTION_CONTINUE_EXECUTION;
2132 }
2133 }
2134
2135 // Last unguard failed or not unguarding
2136 tty->print_raw_cr("Execution protection violation");
2137 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2138 exceptionInfo->ContextRecord);
2139 return EXCEPTION_CONTINUE_SEARCH;
2140 }
2141 }
2142 #endif // _WIN64
2143
2144 // Check to see if we caught the safepoint code in the
2145 // process of write protecting the memory serialization page.
2146 // It write enables the page immediately after protecting it
2147 // so just return.
2148 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2149 JavaThread* thread = (JavaThread*) t;
2150 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2151 address addr = (address) exceptionRecord->ExceptionInformation[1];
2152 if ( os::is_memory_serialize_page(thread, addr) ) {
2153 // Block current thread until the memory serialize page permission restored.
2154 os::block_on_serialize_page_trap();
2155 return EXCEPTION_CONTINUE_EXECUTION;
2156 }
2157 }
2158
2159
2160 if (t != NULL && t->is_Java_thread()) {
2161 JavaThread* thread = (JavaThread*) t;
2162 bool in_java = thread->thread_state() == _thread_in_Java;
2163
2164 // Handle potential stack overflows up front.
2165 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2166 if (os::uses_stack_guard_pages()) {
2167 #ifdef _M_IA64
2168 //
2169 // If it's a legal stack address continue, Windows will map it in.
2170 //
2171 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2172 address addr = (address) exceptionRecord->ExceptionInformation[1];
2173 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() )
2174 return EXCEPTION_CONTINUE_EXECUTION;
2175
2176 // The register save area is the same size as the memory stack
2177 // and starts at the page just above the start of the memory stack.
2178 // If we get a fault in this area, we've run out of register
2179 // stack. If we are in java, try throwing a stack overflow exception.
2180 if (addr > thread->stack_base() &&
2181 addr <= (thread->stack_base()+thread->stack_size()) ) {
2182 char buf[256];
2183 jio_snprintf(buf, sizeof(buf),
2184 "Register stack overflow, addr:%p, stack_base:%p\n",
2185 addr, thread->stack_base() );
2186 tty->print_raw_cr(buf);
2187 // If not in java code, return and hope for the best.
2188 return in_java ? Handle_Exception(exceptionInfo,
2189 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2190 : EXCEPTION_CONTINUE_EXECUTION;
2191 }
2192 #endif
2193 if (thread->stack_yellow_zone_enabled()) {
2194 // Yellow zone violation. The o/s has unprotected the first yellow
2195 // zone page for us. Note: must call disable_stack_yellow_zone to
2196 // update the enabled status, even if the zone contains only one page.
2197 thread->disable_stack_yellow_zone();
2198 // If not in java code, return and hope for the best.
2199 return in_java ? Handle_Exception(exceptionInfo,
2200 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2201 : EXCEPTION_CONTINUE_EXECUTION;
2202 } else {
2203 // Fatal red zone violation.
2204 thread->disable_stack_red_zone();
2205 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2206 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2207 exceptionInfo->ContextRecord);
2208 return EXCEPTION_CONTINUE_SEARCH;
2209 }
2210 } else if (in_java) {
2211 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2212 // a one-time-only guard page, which it has released to us. The next
2213 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2214 return Handle_Exception(exceptionInfo,
2215 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2216 } else {
2217 // Can only return and hope for the best. Further stack growth will
2218 // result in an ACCESS_VIOLATION.
2219 return EXCEPTION_CONTINUE_EXECUTION;
2220 }
2221 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2222 // Either stack overflow or null pointer exception.
2223 if (in_java) {
2224 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2225 address addr = (address) exceptionRecord->ExceptionInformation[1];
2226 address stack_end = thread->stack_base() - thread->stack_size();
2227 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2228 // Stack overflow.
2229 assert(!os::uses_stack_guard_pages(),
2230 "should be caught by red zone code above.");
2231 return Handle_Exception(exceptionInfo,
2232 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2233 }
2234 //
2235 // Check for safepoint polling and implicit null
2236 // We only expect null pointers in the stubs (vtable)
2237 // the rest are checked explicitly now.
2238 //
2239 CodeBlob* cb = CodeCache::find_blob(pc);
2240 if (cb != NULL) {
2241 if (os::is_poll_address(addr)) {
2242 address stub = SharedRuntime::get_poll_stub(pc);
2243 return Handle_Exception(exceptionInfo, stub);
2244 }
2245 }
2246 {
2247 #ifdef _WIN64
2248 //
2249 // If it's a legal stack address map the entire region in
2250 //
2251 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2252 address addr = (address) exceptionRecord->ExceptionInformation[1];
2253 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2254 addr = (address)((uintptr_t)addr &
2255 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2256 os::commit_memory((char *)addr, thread->stack_base() - addr,
2257 false );
2258 return EXCEPTION_CONTINUE_EXECUTION;
2259 }
2260 else
2261 #endif
2262 {
2263 // Null pointer exception.
2264 #ifdef _M_IA64
2265 // We catch register stack overflows in compiled code by doing
2266 // an explicit compare and executing a st8(G0, G0) if the
2267 // BSP enters into our guard area. We test for the overflow
2268 // condition and fall into the normal null pointer exception
2269 // code if BSP hasn't overflowed.
2270 if ( in_java ) {
2271 if(thread->register_stack_overflow()) {
2272 assert((address)exceptionInfo->ContextRecord->IntS3 ==
2273 thread->register_stack_limit(),
2274 "GR7 doesn't contain register_stack_limit");
2275 // Disable the yellow zone which sets the state that
2276 // we've got a stack overflow problem.
2277 if (thread->stack_yellow_zone_enabled()) {
2278 thread->disable_stack_yellow_zone();
2279 }
2280 // Give us some room to process the exception
2281 thread->disable_register_stack_guard();
2282 // Update GR7 with the new limit so we can continue running
2283 // compiled code.
2284 exceptionInfo->ContextRecord->IntS3 =
2285 (ULONGLONG)thread->register_stack_limit();
2286 return Handle_Exception(exceptionInfo,
2287 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2288 } else {
2289 //
2290 // Check for implicit null
2291 // We only expect null pointers in the stubs (vtable)
2292 // the rest are checked explicitly now.
2293 //
2294 if (((uintptr_t)addr) < os::vm_page_size() ) {
2295 // an access to the first page of VM--assume it is a null pointer
2296 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2297 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2298 }
2299 }
2300 } // in_java
2301
2302 // IA64 doesn't use implicit null checking yet. So we shouldn't
2303 // get here.
2304 tty->print_raw_cr("Access violation, possible null pointer exception");
2305 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2306 exceptionInfo->ContextRecord);
2307 return EXCEPTION_CONTINUE_SEARCH;
2308 #else /* !IA64 */
2309
2310 // Windows 98 reports faulting addresses incorrectly
2311 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2312 !os::win32::is_nt()) {
2313 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2314 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2315 }
2316 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2317 exceptionInfo->ContextRecord);
2318 return EXCEPTION_CONTINUE_SEARCH;
2319 #endif
2320 }
2321 }
2322 }
2323
2324 #ifdef _WIN64
2325 // Special care for fast JNI field accessors.
2326 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2327 // in and the heap gets shrunk before the field access.
2328 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2329 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2330 if (addr != (address)-1) {
2331 return Handle_Exception(exceptionInfo, addr);
2332 }
2333 }
2334 #endif
2335
2336 #ifdef _WIN64
2337 // Windows will sometimes generate an access violation
2338 // when we call malloc. Since we use VectoredExceptions
2339 // on 64 bit platforms, we see this exception. We must
2340 // pass this exception on so Windows can recover.
2341 // We check to see if the pc of the fault is in NTDLL.DLL
2342 // if so, we pass control on to Windows for handling.
2343 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH;
2344 #endif
2345
2346 // Stack overflow or null pointer exception in native code.
2347 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2348 exceptionInfo->ContextRecord);
2349 return EXCEPTION_CONTINUE_SEARCH;
2350 }
2351
2352 if (in_java) {
2353 switch (exception_code) {
2354 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2355 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2356
2357 case EXCEPTION_INT_OVERFLOW:
2358 return Handle_IDiv_Exception(exceptionInfo);
2359
2360 } // switch
2361 }
2362 #ifndef _WIN64
2363 if ((thread->thread_state() == _thread_in_Java) ||
2364 (thread->thread_state() == _thread_in_native) )
2365 {
2366 LONG result=Handle_FLT_Exception(exceptionInfo);
2367 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2368 }
2369 #endif //_WIN64
2370 }
2371
2372 if (exception_code != EXCEPTION_BREAKPOINT) {
2373 #ifndef _WIN64
2374 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2375 exceptionInfo->ContextRecord);
2376 #else
2377 // Itanium Windows uses a VectoredExceptionHandler
2378 // Which means that C++ programatic exception handlers (try/except)
2379 // will get here. Continue the search for the right except block if
2380 // the exception code is not a fatal code.
2381 switch ( exception_code ) {
2382 case EXCEPTION_ACCESS_VIOLATION:
2383 case EXCEPTION_STACK_OVERFLOW:
2384 case EXCEPTION_ILLEGAL_INSTRUCTION:
2385 case EXCEPTION_ILLEGAL_INSTRUCTION_2:
2386 case EXCEPTION_INT_OVERFLOW:
2387 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2388 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2389 exceptionInfo->ContextRecord);
2390 }
2391 break;
2392 default:
2393 break;
2394 }
2395 #endif
2396 }
2397 return EXCEPTION_CONTINUE_SEARCH;
2398 }
2399
2400 #ifndef _WIN64
2401 // Special care for fast JNI accessors.
2402 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2403 // the heap gets shrunk before the field access.
2404 // Need to install our own structured exception handler since native code may
2405 // install its own.
2406 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2407 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2408 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2409 address pc = (address) exceptionInfo->ContextRecord->Eip;
2410 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2411 if (addr != (address)-1) {
2412 return Handle_Exception(exceptionInfo, addr);
2413 }
2414 }
2415 return EXCEPTION_CONTINUE_SEARCH;
2416 }
2417
2418 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2419 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2420 __try { \
2421 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2422 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2423 } \
2424 return 0; \
2425 }
2426
2427 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2428 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2429 DEFINE_FAST_GETFIELD(jchar, char, Char)
2430 DEFINE_FAST_GETFIELD(jshort, short, Short)
2431 DEFINE_FAST_GETFIELD(jint, int, Int)
2432 DEFINE_FAST_GETFIELD(jlong, long, Long)
2433 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2434 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2435
2436 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2437 switch (type) {
2438 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2439 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2440 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2441 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2442 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2443 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2444 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2445 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2446 default: ShouldNotReachHere();
2447 }
2448 return (address)-1;
2449 }
2450 #endif
2451
2452 // Virtual Memory
2453
2454 int os::vm_page_size() { return os::win32::vm_page_size(); }
2455 int os::vm_allocation_granularity() {
2456 return os::win32::vm_allocation_granularity();
2457 }
2458
2459 // Windows large page support is available on Windows 2003. In order to use
2460 // large page memory, the administrator must first assign additional privilege
2461 // to the user:
2462 // + select Control Panel -> Administrative Tools -> Local Security Policy
2463 // + select Local Policies -> User Rights Assignment
2464 // + double click "Lock pages in memory", add users and/or groups
2465 // + reboot
2466 // Note the above steps are needed for administrator as well, as administrators
2467 // by default do not have the privilege to lock pages in memory.
2468 //
2469 // Note about Windows 2003: although the API supports committing large page
2470 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2471 // scenario, I found through experiment it only uses large page if the entire
2472 // memory region is reserved and committed in a single VirtualAlloc() call.
2473 // This makes Windows large page support more or less like Solaris ISM, in
2474 // that the entire heap must be committed upfront. This probably will change
2475 // in the future, if so the code below needs to be revisited.
2476
2477 #ifndef MEM_LARGE_PAGES
2478 #define MEM_LARGE_PAGES 0x20000000
2479 #endif
2480
2481 // GetLargePageMinimum is only available on Windows 2003. The other functions
2482 // are available on NT but not on Windows 98/Me. We have to resolve them at
2483 // runtime.
2484 typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void);
2485 typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type)
2486 (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
2487 typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE);
2488 typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID);
2489
2490 static GetLargePageMinimum_func_type _GetLargePageMinimum;
2491 static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges;
2492 static OpenProcessToken_func_type _OpenProcessToken;
2493 static LookupPrivilegeValue_func_type _LookupPrivilegeValue;
2494
2495 static HINSTANCE _kernel32;
2496 static HINSTANCE _advapi32;
2497 static HANDLE _hProcess;
2498 static HANDLE _hToken;
2499
2500 static size_t _large_page_size = 0;
2501
2502 static bool resolve_functions_for_large_page_init() {
2503 _kernel32 = LoadLibrary("kernel32.dll");
2504 if (_kernel32 == NULL) return false;
2505
2506 _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type,
2507 GetProcAddress(_kernel32, "GetLargePageMinimum"));
2508 if (_GetLargePageMinimum == NULL) return false;
2509
2510 _advapi32 = LoadLibrary("advapi32.dll");
2511 if (_advapi32 == NULL) return false;
2512
2513 _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type,
2514 GetProcAddress(_advapi32, "AdjustTokenPrivileges"));
2515 _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type,
2516 GetProcAddress(_advapi32, "OpenProcessToken"));
2517 _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type,
2518 GetProcAddress(_advapi32, "LookupPrivilegeValueA"));
2519 return _AdjustTokenPrivileges != NULL &&
2520 _OpenProcessToken != NULL &&
2521 _LookupPrivilegeValue != NULL;
2522 }
2523
2524 static bool request_lock_memory_privilege() {
2525 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2526 os::current_process_id());
2527
2528 LUID luid;
2529 if (_hProcess != NULL &&
2530 _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2531 _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2532
2533 TOKEN_PRIVILEGES tp;
2534 tp.PrivilegeCount = 1;
2535 tp.Privileges[0].Luid = luid;
2536 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2537
2538 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2539 // privilege. Check GetLastError() too. See MSDN document.
2540 if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2541 (GetLastError() == ERROR_SUCCESS)) {
2542 return true;
2543 }
2544 }
2545
2546 return false;
2547 }
2548
2549 static void cleanup_after_large_page_init() {
2550 _GetLargePageMinimum = NULL;
2551 _AdjustTokenPrivileges = NULL;
2552 _OpenProcessToken = NULL;
2553 _LookupPrivilegeValue = NULL;
2554 if (_kernel32) FreeLibrary(_kernel32);
2555 _kernel32 = NULL;
2556 if (_advapi32) FreeLibrary(_advapi32);
2557 _advapi32 = NULL;
2558 if (_hProcess) CloseHandle(_hProcess);
2559 _hProcess = NULL;
2560 if (_hToken) CloseHandle(_hToken);
2561 _hToken = NULL;
2562 }
2563
2564 bool os::large_page_init() {
2565 if (!UseLargePages) return false;
2566
2567 // print a warning if any large page related flag is specified on command line
2568 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2569 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2570 bool success = false;
2571
2572 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2573 if (resolve_functions_for_large_page_init()) {
2574 if (request_lock_memory_privilege()) {
2575 size_t s = _GetLargePageMinimum();
2576 if (s) {
2577 #if defined(IA32) || defined(AMD64)
2578 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2579 WARN("JVM cannot use large pages bigger than 4mb.");
2580 } else {
2581 #endif
2582 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2583 _large_page_size = LargePageSizeInBytes;
2584 } else {
2585 _large_page_size = s;
2586 }
2587 success = true;
2588 #if defined(IA32) || defined(AMD64)
2589 }
2590 #endif
2591 } else {
2592 WARN("Large page is not supported by the processor.");
2593 }
2594 } else {
2595 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2596 }
2597 } else {
2598 WARN("Large page is not supported by the operating system.");
2599 }
2600 #undef WARN
2601
2602 const size_t default_page_size = (size_t) vm_page_size();
2603 if (success && _large_page_size > default_page_size) {
2604 _page_sizes[0] = _large_page_size;
2605 _page_sizes[1] = default_page_size;
2606 _page_sizes[2] = 0;
2607 }
2608
2609 cleanup_after_large_page_init();
2610 return success;
2611 }
2612
2613 // On win32, one cannot release just a part of reserved memory, it's an
2614 // all or nothing deal. When we split a reservation, we must break the
2615 // reservation into two reservations.
2616 void os::split_reserved_memory(char *base, size_t size, size_t split,
2617 bool realloc) {
2618 if (size > 0) {
2619 release_memory(base, size);
2620 if (realloc) {
2621 reserve_memory(split, base);
2622 }
2623 if (size != split) {
2624 reserve_memory(size - split, base + split);
2625 }
2626 }
2627 }
2628
2629 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
2630 assert((size_t)addr % os::vm_allocation_granularity() == 0,
2631 "reserve alignment");
2632 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
2633 char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
2634 assert(res == NULL || addr == NULL || addr == res,
2635 "Unexpected address from reserve.");
2636 return res;
2637 }
2638
2639 // Reserve memory at an arbitrary address, only if that area is
2640 // available (and not reserved for something else).
2641 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2642 // Windows os::reserve_memory() fails of the requested address range is
2643 // not avilable.
2644 return reserve_memory(bytes, requested_addr);
2645 }
2646
2647 size_t os::large_page_size() {
2648 return _large_page_size;
2649 }
2650
2651 bool os::can_commit_large_page_memory() {
2652 // Windows only uses large page memory when the entire region is reserved
2653 // and committed in a single VirtualAlloc() call. This may change in the
2654 // future, but with Windows 2003 it's not possible to commit on demand.
2655 return false;
2656 }
2657
2658 bool os::can_execute_large_page_memory() {
2659 return true;
2660 }
2661
2662 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
2663
2664 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
2665
2666 if (UseLargePagesIndividualAllocation) {
2667 if (TracePageSizes && Verbose) {
2668 tty->print_cr("Reserving large pages individually.");
2669 }
2670 char * p_buf;
2671 // first reserve enough address space in advance since we want to be
2672 // able to break a single contiguous virtual address range into multiple
2673 // large page commits but WS2003 does not allow reserving large page space
2674 // so we just use 4K pages for reserve, this gives us a legal contiguous
2675 // address space. then we will deallocate that reservation, and re alloc
2676 // using large pages
2677 const size_t size_of_reserve = bytes + _large_page_size;
2678 if (bytes > size_of_reserve) {
2679 // Overflowed.
2680 warning("Individually allocated large pages failed, "
2681 "use -XX:-UseLargePagesIndividualAllocation to turn off");
2682 return NULL;
2683 }
2684 p_buf = (char *) VirtualAlloc(addr,
2685 size_of_reserve, // size of Reserve
2686 MEM_RESERVE,
2687 PAGE_READWRITE);
2688 // If reservation failed, return NULL
2689 if (p_buf == NULL) return NULL;
2690
2691 release_memory(p_buf, bytes + _large_page_size);
2692 // round up to page boundary. If the size_of_reserve did not
2693 // overflow and the reservation did not fail, this align up
2694 // should not overflow.
2695 p_buf = (char *) align_size_up((size_t)p_buf, _large_page_size);
2696
2697 // now go through and allocate one page at a time until all bytes are
2698 // allocated
2699 size_t bytes_remaining = align_size_up(bytes, _large_page_size);
2700 // An overflow of align_size_up() would have been caught above
2701 // in the calculation of size_of_reserve.
2702 char * next_alloc_addr = p_buf;
2703
2704 #ifdef ASSERT
2705 // Variable for the failure injection
2706 long ran_num = os::random();
2707 size_t fail_after = ran_num % bytes;
2708 #endif
2709
2710 while (bytes_remaining) {
2711 size_t bytes_to_rq = MIN2(bytes_remaining, _large_page_size);
2712 // Note allocate and commit
2713 char * p_new;
2714
2715 #ifdef ASSERT
2716 bool inject_error = LargePagesIndividualAllocationInjectError &&
2717 (bytes_remaining <= fail_after);
2718 #else
2719 const bool inject_error = false;
2720 #endif
2721
2722 if (inject_error) {
2723 p_new = NULL;
2724 } else {
2725 p_new = (char *) VirtualAlloc(next_alloc_addr,
2726 bytes_to_rq,
2727 MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES,
2728 prot);
2729 }
2730
2731 if (p_new == NULL) {
2732 // Free any allocated pages
2733 if (next_alloc_addr > p_buf) {
2734 // Some memory was committed so release it.
2735 size_t bytes_to_release = bytes - bytes_remaining;
2736 release_memory(p_buf, bytes_to_release);
2737 }
2738 #ifdef ASSERT
2739 if (UseLargePagesIndividualAllocation &&
2740 LargePagesIndividualAllocationInjectError) {
2741 if (TracePageSizes && Verbose) {
2742 tty->print_cr("Reserving large pages individually failed.");
2743 }
2744 }
2745 #endif
2746 return NULL;
2747 }
2748 bytes_remaining -= bytes_to_rq;
2749 next_alloc_addr += bytes_to_rq;
2750 }
2751
2752 return p_buf;
2753
2754 } else {
2755 // normal policy just allocate it all at once
2756 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
2757 char * res = (char *)VirtualAlloc(NULL, bytes, flag, prot);
2758 return res;
2759 }
2760 }
2761
2762 bool os::release_memory_special(char* base, size_t bytes) {
2763 return release_memory(base, bytes);
2764 }
2765
2766 void os::print_statistics() {
2767 }
2768
2769 bool os::commit_memory(char* addr, size_t bytes, bool exec) {
2770 if (bytes == 0) {
2771 // Don't bother the OS with noops.
2772 return true;
2773 }
2774 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
2775 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
2776 // Don't attempt to print anything if the OS call fails. We're
2777 // probably low on resources, so the print itself may cause crashes.
2778 bool result = VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) != 0;
2779 if (result != NULL && exec) {
2780 DWORD oldprot;
2781 // Windows doc says to use VirtualProtect to get execute permissions
2782 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot) != 0;
2783 } else {
2784 return result;
2785 }
2786 }
2787
2788 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint,
2789 bool exec) {
2790 return commit_memory(addr, size, exec);
2791 }
2792
2793 bool os::uncommit_memory(char* addr, size_t bytes) {
2794 if (bytes == 0) {
2795 // Don't bother the OS with noops.
2796 return true;
2797 }
2798 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
2799 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
2800 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0;
2801 }
2802
2803 bool os::release_memory(char* addr, size_t bytes) {
2804 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
2805 }
2806
2807 bool os::create_stack_guard_pages(char* addr, size_t size) {
2808 return os::commit_memory(addr, size);
2809 }
2810
2811 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2812 return os::uncommit_memory(addr, size);
2813 }
2814
2815 // Set protections specified
2816 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2817 bool is_committed) {
2818 unsigned int p = 0;
2819 switch (prot) {
2820 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
2821 case MEM_PROT_READ: p = PAGE_READONLY; break;
2822 case MEM_PROT_RW: p = PAGE_READWRITE; break;
2823 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
2824 default:
2825 ShouldNotReachHere();
2826 }
2827
2828 DWORD old_status;
2829
2830 // Strange enough, but on Win32 one can change protection only for committed
2831 // memory, not a big deal anyway, as bytes less or equal than 64K
2832 if (!is_committed && !commit_memory(addr, bytes, prot == MEM_PROT_RWX)) {
2833 fatal("cannot commit protection page");
2834 }
2835 // One cannot use os::guard_memory() here, as on Win32 guard page
2836 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
2837 //
2838 // Pages in the region become guard pages. Any attempt to access a guard page
2839 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
2840 // the guard page status. Guard pages thus act as a one-time access alarm.
2841 return VirtualProtect(addr, bytes, p, &old_status) != 0;
2842 }
2843
2844 bool os::guard_memory(char* addr, size_t bytes) {
2845 DWORD old_status;
2846 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
2847 }
2848
2849 bool os::unguard_memory(char* addr, size_t bytes) {
2850 DWORD old_status;
2851 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
2852 }
2853
2854 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
2855 void os::free_memory(char *addr, size_t bytes) { }
2856 void os::numa_make_global(char *addr, size_t bytes) { }
2857 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
2858 bool os::numa_topology_changed() { return false; }
2859 size_t os::numa_get_groups_num() { return 1; }
2860 int os::numa_get_group_id() { return 0; }
2861 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2862 if (size > 0) {
2863 ids[0] = 0;
2864 return 1;
2865 }
2866 return 0;
2867 }
2868
2869 bool os::get_page_info(char *start, page_info* info) {
2870 return false;
2871 }
2872
2873 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2874 return end;
2875 }
2876
2877 char* os::non_memory_address_word() {
2878 // Must never look like an address returned by reserve_memory,
2879 // even in its subfields (as defined by the CPU immediate fields,
2880 // if the CPU splits constants across multiple instructions).
2881 return (char*)-1;
2882 }
2883
2884 #define MAX_ERROR_COUNT 100
2885 #define SYS_THREAD_ERROR 0xffffffffUL
2886
2887 void os::pd_start_thread(Thread* thread) {
2888 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
2889 // Returns previous suspend state:
2890 // 0: Thread was not suspended
2891 // 1: Thread is running now
2892 // >1: Thread is still suspended.
2893 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
2894 }
2895
2896 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2897 return ::read(fd, buf, nBytes);
2898 }
2899
2900 class HighResolutionInterval {
2901 // The default timer resolution seems to be 10 milliseconds.
2902 // (Where is this written down?)
2903 // If someone wants to sleep for only a fraction of the default,
2904 // then we set the timer resolution down to 1 millisecond for
2905 // the duration of their interval.
2906 // We carefully set the resolution back, since otherwise we
2907 // seem to incur an overhead (3%?) that we don't need.
2908 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
2909 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
2910 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
2911 // timeBeginPeriod() if the relative error exceeded some threshold.
2912 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
2913 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
2914 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
2915 // resolution timers running.
2916 private:
2917 jlong resolution;
2918 public:
2919 HighResolutionInterval(jlong ms) {
2920 resolution = ms % 10L;
2921 if (resolution != 0) {
2922 MMRESULT result = timeBeginPeriod(1L);
2923 }
2924 }
2925 ~HighResolutionInterval() {
2926 if (resolution != 0) {
2927 MMRESULT result = timeEndPeriod(1L);
2928 }
2929 resolution = 0L;
2930 }
2931 };
2932
2933 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
2934 jlong limit = (jlong) MAXDWORD;
2935
2936 while(ms > limit) {
2937 int res;
2938 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
2939 return res;
2940 ms -= limit;
2941 }
2942
2943 assert(thread == Thread::current(), "thread consistency check");
2944 OSThread* osthread = thread->osthread();
2945 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
2946 int result;
2947 if (interruptable) {
2948 assert(thread->is_Java_thread(), "must be java thread");
2949 JavaThread *jt = (JavaThread *) thread;
2950 ThreadBlockInVM tbivm(jt);
2951
2952 jt->set_suspend_equivalent();
2953 // cleared by handle_special_suspend_equivalent_condition() or
2954 // java_suspend_self() via check_and_wait_while_suspended()
2955
2956 HANDLE events[1];
2957 events[0] = osthread->interrupt_event();
2958 HighResolutionInterval *phri=NULL;
2959 if(!ForceTimeHighResolution)
2960 phri = new HighResolutionInterval( ms );
2961 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
2962 result = OS_TIMEOUT;
2963 } else {
2964 ResetEvent(osthread->interrupt_event());
2965 osthread->set_interrupted(false);
2966 result = OS_INTRPT;
2967 }
2968 delete phri; //if it is NULL, harmless
2969
2970 // were we externally suspended while we were waiting?
2971 jt->check_and_wait_while_suspended();
2972 } else {
2973 assert(!thread->is_Java_thread(), "must not be java thread");
2974 Sleep((long) ms);
2975 result = OS_TIMEOUT;
2976 }
2977 return result;
2978 }
2979
2980 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2981 void os::infinite_sleep() {
2982 while (true) { // sleep forever ...
2983 Sleep(100000); // ... 100 seconds at a time
2984 }
2985 }
2986
2987 typedef BOOL (WINAPI * STTSignature)(void) ;
2988
2989 os::YieldResult os::NakedYield() {
2990 // Use either SwitchToThread() or Sleep(0)
2991 // Consider passing back the return value from SwitchToThread().
2992 // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread.
2993 // In that case we revert to Sleep(0).
2994 static volatile STTSignature stt = (STTSignature) 1 ;
2995
2996 if (stt == ((STTSignature) 1)) {
2997 stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ;
2998 // It's OK if threads race during initialization as the operation above is idempotent.
2999 }
3000 if (stt != NULL) {
3001 return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3002 } else {
3003 Sleep (0) ;
3004 }
3005 return os::YIELD_UNKNOWN ;
3006 }
3007
3008 void os::yield() { os::NakedYield(); }
3009
3010 void os::yield_all(int attempts) {
3011 // Yields to all threads, including threads with lower priorities
3012 Sleep(1);
3013 }
3014
3015 // Win32 only gives you access to seven real priorities at a time,
3016 // so we compress Java's ten down to seven. It would be better
3017 // if we dynamically adjusted relative priorities.
3018
3019 int os::java_to_os_priority[MaxPriority + 1] = {
3020 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3021 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3022 THREAD_PRIORITY_LOWEST, // 2
3023 THREAD_PRIORITY_BELOW_NORMAL, // 3
3024 THREAD_PRIORITY_BELOW_NORMAL, // 4
3025 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3026 THREAD_PRIORITY_NORMAL, // 6
3027 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3028 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3029 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3030 THREAD_PRIORITY_HIGHEST // 10 MaxPriority
3031 };
3032
3033 int prio_policy1[MaxPriority + 1] = {
3034 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3035 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3036 THREAD_PRIORITY_LOWEST, // 2
3037 THREAD_PRIORITY_BELOW_NORMAL, // 3
3038 THREAD_PRIORITY_BELOW_NORMAL, // 4
3039 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3040 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3041 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3042 THREAD_PRIORITY_HIGHEST, // 8
3043 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3044 THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority
3045 };
3046
3047 static int prio_init() {
3048 // If ThreadPriorityPolicy is 1, switch tables
3049 if (ThreadPriorityPolicy == 1) {
3050 int i;
3051 for (i = 0; i < MaxPriority + 1; i++) {
3052 os::java_to_os_priority[i] = prio_policy1[i];
3053 }
3054 }
3055 return 0;
3056 }
3057
3058 OSReturn os::set_native_priority(Thread* thread, int priority) {
3059 if (!UseThreadPriorities) return OS_OK;
3060 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3061 return ret ? OS_OK : OS_ERR;
3062 }
3063
3064 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3065 if ( !UseThreadPriorities ) {
3066 *priority_ptr = java_to_os_priority[NormPriority];
3067 return OS_OK;
3068 }
3069 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3070 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3071 assert(false, "GetThreadPriority failed");
3072 return OS_ERR;
3073 }
3074 *priority_ptr = os_prio;
3075 return OS_OK;
3076 }
3077
3078
3079 // Hint to the underlying OS that a task switch would not be good.
3080 // Void return because it's a hint and can fail.
3081 void os::hint_no_preempt() {}
3082
3083 void os::interrupt(Thread* thread) {
3084 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3085 "possibility of dangling Thread pointer");
3086
3087 OSThread* osthread = thread->osthread();
3088 osthread->set_interrupted(true);
3089 // More than one thread can get here with the same value of osthread,
3090 // resulting in multiple notifications. We do, however, want the store
3091 // to interrupted() to be visible to other threads before we post
3092 // the interrupt event.
3093 OrderAccess::release();
3094 SetEvent(osthread->interrupt_event());
3095 // For JSR166: unpark after setting status
3096 if (thread->is_Java_thread())
3097 ((JavaThread*)thread)->parker()->unpark();
3098
3099 ParkEvent * ev = thread->_ParkEvent ;
3100 if (ev != NULL) ev->unpark() ;
3101
3102 }
3103
3104
3105 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3106 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3107 "possibility of dangling Thread pointer");
3108
3109 OSThread* osthread = thread->osthread();
3110 bool interrupted;
3111 interrupted = osthread->interrupted();
3112 if (clear_interrupted == true) {
3113 osthread->set_interrupted(false);
3114 ResetEvent(osthread->interrupt_event());
3115 } // Otherwise leave the interrupted state alone
3116
3117 return interrupted;
3118 }
3119
3120 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3121 ExtendedPC os::get_thread_pc(Thread* thread) {
3122 CONTEXT context;
3123 context.ContextFlags = CONTEXT_CONTROL;
3124 HANDLE handle = thread->osthread()->thread_handle();
3125 #ifdef _M_IA64
3126 assert(0, "Fix get_thread_pc");
3127 return ExtendedPC(NULL);
3128 #else
3129 if (GetThreadContext(handle, &context)) {
3130 #ifdef _M_AMD64
3131 return ExtendedPC((address) context.Rip);
3132 #else
3133 return ExtendedPC((address) context.Eip);
3134 #endif
3135 } else {
3136 return ExtendedPC(NULL);
3137 }
3138 #endif
3139 }
3140
3141 // GetCurrentThreadId() returns DWORD
3142 intx os::current_thread_id() { return GetCurrentThreadId(); }
3143
3144 static int _initial_pid = 0;
3145
3146 int os::current_process_id()
3147 {
3148 return (_initial_pid ? _initial_pid : _getpid());
3149 }
3150
3151 int os::win32::_vm_page_size = 0;
3152 int os::win32::_vm_allocation_granularity = 0;
3153 int os::win32::_processor_type = 0;
3154 // Processor level is not available on non-NT systems, use vm_version instead
3155 int os::win32::_processor_level = 0;
3156 julong os::win32::_physical_memory = 0;
3157 size_t os::win32::_default_stack_size = 0;
3158
3159 intx os::win32::_os_thread_limit = 0;
3160 volatile intx os::win32::_os_thread_count = 0;
3161
3162 bool os::win32::_is_nt = false;
3163 bool os::win32::_is_windows_2003 = false;
3164
3165
3166 void os::win32::initialize_system_info() {
3167 SYSTEM_INFO si;
3168 GetSystemInfo(&si);
3169 _vm_page_size = si.dwPageSize;
3170 _vm_allocation_granularity = si.dwAllocationGranularity;
3171 _processor_type = si.dwProcessorType;
3172 _processor_level = si.wProcessorLevel;
3173 set_processor_count(si.dwNumberOfProcessors);
3174
3175 MEMORYSTATUSEX ms;
3176 ms.dwLength = sizeof(ms);
3177
3178 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3179 // dwMemoryLoad (% of memory in use)
3180 GlobalMemoryStatusEx(&ms);
3181 _physical_memory = ms.ullTotalPhys;
3182
3183 OSVERSIONINFO oi;
3184 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
3185 GetVersionEx(&oi);
3186 switch(oi.dwPlatformId) {
3187 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3188 case VER_PLATFORM_WIN32_NT:
3189 _is_nt = true;
3190 {
3191 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3192 if (os_vers == 5002) {
3193 _is_windows_2003 = true;
3194 }
3195 }
3196 break;
3197 default: fatal("Unknown platform");
3198 }
3199
3200 _default_stack_size = os::current_stack_size();
3201 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3202 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3203 "stack size not a multiple of page size");
3204
3205 initialize_performance_counter();
3206
3207 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3208 // known to deadlock the system, if the VM issues to thread operations with
3209 // a too high frequency, e.g., such as changing the priorities.
3210 // The 6000 seems to work well - no deadlocks has been notices on the test
3211 // programs that we have seen experience this problem.
3212 if (!os::win32::is_nt()) {
3213 StarvationMonitorInterval = 6000;
3214 }
3215 }
3216
3217
3218 void os::win32::setmode_streams() {
3219 _setmode(_fileno(stdin), _O_BINARY);
3220 _setmode(_fileno(stdout), _O_BINARY);
3221 _setmode(_fileno(stderr), _O_BINARY);
3222 }
3223
3224
3225 int os::message_box(const char* title, const char* message) {
3226 int result = MessageBox(NULL, message, title,
3227 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3228 return result == IDYES;
3229 }
3230
3231 int os::allocate_thread_local_storage() {
3232 return TlsAlloc();
3233 }
3234
3235
3236 void os::free_thread_local_storage(int index) {
3237 TlsFree(index);
3238 }
3239
3240
3241 void os::thread_local_storage_at_put(int index, void* value) {
3242 TlsSetValue(index, value);
3243 assert(thread_local_storage_at(index) == value, "Just checking");
3244 }
3245
3246
3247 void* os::thread_local_storage_at(int index) {
3248 return TlsGetValue(index);
3249 }
3250
3251
3252 #ifndef PRODUCT
3253 #ifndef _WIN64
3254 // Helpers to check whether NX protection is enabled
3255 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3256 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3257 pex->ExceptionRecord->NumberParameters > 0 &&
3258 pex->ExceptionRecord->ExceptionInformation[0] ==
3259 EXCEPTION_INFO_EXEC_VIOLATION) {
3260 return EXCEPTION_EXECUTE_HANDLER;
3261 }
3262 return EXCEPTION_CONTINUE_SEARCH;
3263 }
3264
3265 void nx_check_protection() {
3266 // If NX is enabled we'll get an exception calling into code on the stack
3267 char code[] = { (char)0xC3 }; // ret
3268 void *code_ptr = (void *)code;
3269 __try {
3270 __asm call code_ptr
3271 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3272 tty->print_raw_cr("NX protection detected.");
3273 }
3274 }
3275 #endif // _WIN64
3276 #endif // PRODUCT
3277
3278 // this is called _before_ the global arguments have been parsed
3279 void os::init(void) {
3280 _initial_pid = _getpid();
3281
3282 init_random(1234567);
3283
3284 win32::initialize_system_info();
3285 win32::setmode_streams();
3286 init_page_sizes((size_t) win32::vm_page_size());
3287
3288 // For better scalability on MP systems (must be called after initialize_system_info)
3289 #ifndef PRODUCT
3290 if (is_MP()) {
3291 NoYieldsInMicrolock = true;
3292 }
3293 #endif
3294 // This may be overridden later when argument processing is done.
3295 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3296 os::win32::is_windows_2003());
3297
3298 // Initialize main_process and main_thread
3299 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3300 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3301 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3302 fatal("DuplicateHandle failed\n");
3303 }
3304 main_thread_id = (int) GetCurrentThreadId();
3305 }
3306
3307 // To install functions for atexit processing
3308 extern "C" {
3309 static void perfMemory_exit_helper() {
3310 perfMemory_exit();
3311 }
3312 }
3313
3314 // this is called _after_ the global arguments have been parsed
3315 jint os::init_2(void) {
3316 // Allocate a single page and mark it as readable for safepoint polling
3317 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3318 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3319
3320 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3321 guarantee( return_page != NULL, "Commit Failed for polling page");
3322
3323 os::set_polling_page( polling_page );
3324
3325 #ifndef PRODUCT
3326 if( Verbose && PrintMiscellaneous )
3327 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3328 #endif
3329
3330 if (!UseMembar) {
3331 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3332 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3333
3334 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3335 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3336
3337 os::set_memory_serialize_page( mem_serialize_page );
3338
3339 #ifndef PRODUCT
3340 if(Verbose && PrintMiscellaneous)
3341 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3342 #endif
3343 }
3344
3345 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init());
3346
3347 // Setup Windows Exceptions
3348
3349 // On Itanium systems, Structured Exception Handling does not
3350 // work since stack frames must be walkable by the OS. Since
3351 // much of our code is dynamically generated, and we do not have
3352 // proper unwind .xdata sections, the system simply exits
3353 // rather than delivering the exception. To work around
3354 // this we use VectorExceptions instead.
3355 #ifdef _WIN64
3356 if (UseVectoredExceptions) {
3357 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter);
3358 }
3359 #endif
3360
3361 // for debugging float code generation bugs
3362 if (ForceFloatExceptions) {
3363 #ifndef _WIN64
3364 static long fp_control_word = 0;
3365 __asm { fstcw fp_control_word }
3366 // see Intel PPro Manual, Vol. 2, p 7-16
3367 const long precision = 0x20;
3368 const long underflow = 0x10;
3369 const long overflow = 0x08;
3370 const long zero_div = 0x04;
3371 const long denorm = 0x02;
3372 const long invalid = 0x01;
3373 fp_control_word |= invalid;
3374 __asm { fldcw fp_control_word }
3375 #endif
3376 }
3377
3378 // Initialize HPI.
3379 jint hpi_result = hpi::initialize();
3380 if (hpi_result != JNI_OK) { return hpi_result; }
3381
3382 // If stack_commit_size is 0, windows will reserve the default size,
3383 // but only commit a small portion of it.
3384 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3385 size_t default_reserve_size = os::win32::default_stack_size();
3386 size_t actual_reserve_size = stack_commit_size;
3387 if (stack_commit_size < default_reserve_size) {
3388 // If stack_commit_size == 0, we want this too
3389 actual_reserve_size = default_reserve_size;
3390 }
3391
3392 // Check minimum allowable stack size for thread creation and to initialize
3393 // the java system classes, including StackOverflowError - depends on page
3394 // size. Add a page for compiler2 recursion in main thread.
3395 // Add in 2*BytesPerWord times page size to account for VM stack during
3396 // class initialization depending on 32 or 64 bit VM.
3397 size_t min_stack_allowed =
3398 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3399 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
3400 if (actual_reserve_size < min_stack_allowed) {
3401 tty->print_cr("\nThe stack size specified is too small, "
3402 "Specify at least %dk",
3403 min_stack_allowed / K);
3404 return JNI_ERR;
3405 }
3406
3407 JavaThread::set_stack_size_at_create(stack_commit_size);
3408
3409 // Calculate theoretical max. size of Threads to guard gainst artifical
3410 // out-of-memory situations, where all available address-space has been
3411 // reserved by thread stacks.
3412 assert(actual_reserve_size != 0, "Must have a stack");
3413
3414 // Calculate the thread limit when we should start doing Virtual Memory
3415 // banging. Currently when the threads will have used all but 200Mb of space.
3416 //
3417 // TODO: consider performing a similar calculation for commit size instead
3418 // as reserve size, since on a 64-bit platform we'll run into that more
3419 // often than running out of virtual memory space. We can use the
3420 // lower value of the two calculations as the os_thread_limit.
3421 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3422 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3423
3424 // at exit methods are called in the reverse order of their registration.
3425 // there is no limit to the number of functions registered. atexit does
3426 // not set errno.
3427
3428 if (PerfAllowAtExitRegistration) {
3429 // only register atexit functions if PerfAllowAtExitRegistration is set.
3430 // atexit functions can be delayed until process exit time, which
3431 // can be problematic for embedded VM situations. Embedded VMs should
3432 // call DestroyJavaVM() to assure that VM resources are released.
3433
3434 // note: perfMemory_exit_helper atexit function may be removed in
3435 // the future if the appropriate cleanup code can be added to the
3436 // VM_Exit VMOperation's doit method.
3437 if (atexit(perfMemory_exit_helper) != 0) {
3438 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3439 }
3440 }
3441
3442 // initialize PSAPI or ToolHelp for fatal error handler
3443 if (win32::is_nt()) _init_psapi();
3444 else _init_toolhelp();
3445
3446 #ifndef _WIN64
3447 // Print something if NX is enabled (win32 on AMD64)
3448 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
3449 #endif
3450
3451 // initialize thread priority policy
3452 prio_init();
3453
3454 if (UseNUMA && !ForceNUMA) {
3455 UseNUMA = false; // Currently unsupported.
3456 }
3457
3458 return JNI_OK;
3459 }
3460
3461 void os::init_3(void) {
3462 return;
3463 }
3464
3465 // Mark the polling page as unreadable
3466 void os::make_polling_page_unreadable(void) {
3467 DWORD old_status;
3468 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
3469 fatal("Could not disable polling page");
3470 };
3471
3472 // Mark the polling page as readable
3473 void os::make_polling_page_readable(void) {
3474 DWORD old_status;
3475 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
3476 fatal("Could not enable polling page");
3477 };
3478
3479
3480 int os::stat(const char *path, struct stat *sbuf) {
3481 char pathbuf[MAX_PATH];
3482 if (strlen(path) > MAX_PATH - 1) {
3483 errno = ENAMETOOLONG;
3484 return -1;
3485 }
3486 hpi::native_path(strcpy(pathbuf, path));
3487 int ret = ::stat(pathbuf, sbuf);
3488 if (sbuf != NULL && UseUTCFileTimestamp) {
3489 // Fix for 6539723. st_mtime returned from stat() is dependent on
3490 // the system timezone and so can return different values for the
3491 // same file if/when daylight savings time changes. This adjustment
3492 // makes sure the same timestamp is returned regardless of the TZ.
3493 //
3494 // See:
3495 // http://msdn.microsoft.com/library/
3496 // default.asp?url=/library/en-us/sysinfo/base/
3497 // time_zone_information_str.asp
3498 // and
3499 // http://msdn.microsoft.com/library/default.asp?url=
3500 // /library/en-us/sysinfo/base/settimezoneinformation.asp
3501 //
3502 // NOTE: there is a insidious bug here: If the timezone is changed
3503 // after the call to stat() but before 'GetTimeZoneInformation()', then
3504 // the adjustment we do here will be wrong and we'll return the wrong
3505 // value (which will likely end up creating an invalid class data
3506 // archive). Absent a better API for this, or some time zone locking
3507 // mechanism, we'll have to live with this risk.
3508 TIME_ZONE_INFORMATION tz;
3509 DWORD tzid = GetTimeZoneInformation(&tz);
3510 int daylightBias =
3511 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
3512 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
3513 }
3514 return ret;
3515 }
3516
3517
3518 #define FT2INT64(ft) \
3519 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
3520
3521
3522 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3523 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3524 // of a thread.
3525 //
3526 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3527 // the fast estimate available on the platform.
3528
3529 // current_thread_cpu_time() is not optimized for Windows yet
3530 jlong os::current_thread_cpu_time() {
3531 // return user + sys since the cost is the same
3532 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
3533 }
3534
3535 jlong os::thread_cpu_time(Thread* thread) {
3536 // consistent with what current_thread_cpu_time() returns.
3537 return os::thread_cpu_time(thread, true /* user+sys */);
3538 }
3539
3540 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3541 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3542 }
3543
3544 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
3545 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
3546 // If this function changes, os::is_thread_cpu_time_supported() should too
3547 if (os::win32::is_nt()) {
3548 FILETIME CreationTime;
3549 FILETIME ExitTime;
3550 FILETIME KernelTime;
3551 FILETIME UserTime;
3552
3553 if ( GetThreadTimes(thread->osthread()->thread_handle(),
3554 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3555 return -1;
3556 else
3557 if (user_sys_cpu_time) {
3558 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
3559 } else {
3560 return FT2INT64(UserTime) * 100;
3561 }
3562 } else {
3563 return (jlong) timeGetTime() * 1000000;
3564 }
3565 }
3566
3567 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3568 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3569 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3570 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3571 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3572 }
3573
3574 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3575 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3576 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3577 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3578 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3579 }
3580
3581 bool os::is_thread_cpu_time_supported() {
3582 // see os::thread_cpu_time
3583 if (os::win32::is_nt()) {
3584 FILETIME CreationTime;
3585 FILETIME ExitTime;
3586 FILETIME KernelTime;
3587 FILETIME UserTime;
3588
3589 if ( GetThreadTimes(GetCurrentThread(),
3590 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3591 return false;
3592 else
3593 return true;
3594 } else {
3595 return false;
3596 }
3597 }
3598
3599 // Windows does't provide a loadavg primitive so this is stubbed out for now.
3600 // It does have primitives (PDH API) to get CPU usage and run queue length.
3601 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
3602 // If we wanted to implement loadavg on Windows, we have a few options:
3603 //
3604 // a) Query CPU usage and run queue length and "fake" an answer by
3605 // returning the CPU usage if it's under 100%, and the run queue
3606 // length otherwise. It turns out that querying is pretty slow
3607 // on Windows, on the order of 200 microseconds on a fast machine.
3608 // Note that on the Windows the CPU usage value is the % usage
3609 // since the last time the API was called (and the first call
3610 // returns 100%), so we'd have to deal with that as well.
3611 //
3612 // b) Sample the "fake" answer using a sampling thread and store
3613 // the answer in a global variable. The call to loadavg would
3614 // just return the value of the global, avoiding the slow query.
3615 //
3616 // c) Sample a better answer using exponential decay to smooth the
3617 // value. This is basically the algorithm used by UNIX kernels.
3618 //
3619 // Note that sampling thread starvation could affect both (b) and (c).
3620 int os::loadavg(double loadavg[], int nelem) {
3621 return -1;
3622 }
3623
3624
3625 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
3626 bool os::dont_yield() {
3627 return DontYieldALot;
3628 }
3629
3630 // Is a (classpath) directory empty?
3631 bool os::dir_is_empty(const char* path) {
3632 WIN32_FIND_DATA fd;
3633 HANDLE f = FindFirstFile(path, &fd);
3634 if (f == INVALID_HANDLE_VALUE) {
3635 return true;
3636 }
3637 FindClose(f);
3638 return false;
3639 }
3640
3641 // create binary file, rewriting existing file if required
3642 int os::create_binary_file(const char* path, bool rewrite_existing) {
3643 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
3644 if (!rewrite_existing) {
3645 oflags |= _O_EXCL;
3646 }
3647 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
3648 }
3649
3650 // return current position of file pointer
3651 jlong os::current_file_offset(int fd) {
3652 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
3653 }
3654
3655 // move file pointer to the specified offset
3656 jlong os::seek_to_file_offset(int fd, jlong offset) {
3657 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
3658 }
3659
3660
3661 // Map a block of memory.
3662 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
3663 char *addr, size_t bytes, bool read_only,
3664 bool allow_exec) {
3665 HANDLE hFile;
3666 char* base;
3667
3668 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
3669 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
3670 if (hFile == NULL) {
3671 if (PrintMiscellaneous && Verbose) {
3672 DWORD err = GetLastError();
3673 tty->print_cr("CreateFile() failed: GetLastError->%ld.");
3674 }
3675 return NULL;
3676 }
3677
3678 if (allow_exec) {
3679 // CreateFileMapping/MapViewOfFileEx can't map executable memory
3680 // unless it comes from a PE image (which the shared archive is not.)
3681 // Even VirtualProtect refuses to give execute access to mapped memory
3682 // that was not previously executable.
3683 //
3684 // Instead, stick the executable region in anonymous memory. Yuck.
3685 // Penalty is that ~4 pages will not be shareable - in the future
3686 // we might consider DLLizing the shared archive with a proper PE
3687 // header so that mapping executable + sharing is possible.
3688
3689 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
3690 PAGE_READWRITE);
3691 if (base == NULL) {
3692 if (PrintMiscellaneous && Verbose) {
3693 DWORD err = GetLastError();
3694 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
3695 }
3696 CloseHandle(hFile);
3697 return NULL;
3698 }
3699
3700 DWORD bytes_read;
3701 OVERLAPPED overlapped;
3702 overlapped.Offset = (DWORD)file_offset;
3703 overlapped.OffsetHigh = 0;
3704 overlapped.hEvent = NULL;
3705 // ReadFile guarantees that if the return value is true, the requested
3706 // number of bytes were read before returning.
3707 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
3708 if (!res) {
3709 if (PrintMiscellaneous && Verbose) {
3710 DWORD err = GetLastError();
3711 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
3712 }
3713 release_memory(base, bytes);
3714 CloseHandle(hFile);
3715 return NULL;
3716 }
3717 } else {
3718 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
3719 NULL /*file_name*/);
3720 if (hMap == NULL) {
3721 if (PrintMiscellaneous && Verbose) {
3722 DWORD err = GetLastError();
3723 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.");
3724 }
3725 CloseHandle(hFile);
3726 return NULL;
3727 }
3728
3729 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
3730 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
3731 (DWORD)bytes, addr);
3732 if (base == NULL) {
3733 if (PrintMiscellaneous && Verbose) {
3734 DWORD err = GetLastError();
3735 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
3736 }
3737 CloseHandle(hMap);
3738 CloseHandle(hFile);
3739 return NULL;
3740 }
3741
3742 if (CloseHandle(hMap) == 0) {
3743 if (PrintMiscellaneous && Verbose) {
3744 DWORD err = GetLastError();
3745 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
3746 }
3747 CloseHandle(hFile);
3748 return base;
3749 }
3750 }
3751
3752 if (allow_exec) {
3753 DWORD old_protect;
3754 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
3755 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
3756
3757 if (!res) {
3758 if (PrintMiscellaneous && Verbose) {
3759 DWORD err = GetLastError();
3760 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
3761 }
3762 // Don't consider this a hard error, on IA32 even if the
3763 // VirtualProtect fails, we should still be able to execute
3764 CloseHandle(hFile);
3765 return base;
3766 }
3767 }
3768
3769 if (CloseHandle(hFile) == 0) {
3770 if (PrintMiscellaneous && Verbose) {
3771 DWORD err = GetLastError();
3772 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
3773 }
3774 return base;
3775 }
3776
3777 return base;
3778 }
3779
3780
3781 // Remap a block of memory.
3782 char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
3783 char *addr, size_t bytes, bool read_only,
3784 bool allow_exec) {
3785 // This OS does not allow existing memory maps to be remapped so we
3786 // have to unmap the memory before we remap it.
3787 if (!os::unmap_memory(addr, bytes)) {
3788 return NULL;
3789 }
3790
3791 // There is a very small theoretical window between the unmap_memory()
3792 // call above and the map_memory() call below where a thread in native
3793 // code may be able to access an address that is no longer mapped.
3794
3795 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3796 allow_exec);
3797 }
3798
3799
3800 // Unmap a block of memory.
3801 // Returns true=success, otherwise false.
3802
3803 bool os::unmap_memory(char* addr, size_t bytes) {
3804 BOOL result = UnmapViewOfFile(addr);
3805 if (result == 0) {
3806 if (PrintMiscellaneous && Verbose) {
3807 DWORD err = GetLastError();
3808 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
3809 }
3810 return false;
3811 }
3812 return true;
3813 }
3814
3815 void os::pause() {
3816 char filename[MAX_PATH];
3817 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3818 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
3819 } else {
3820 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3821 }
3822
3823 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3824 if (fd != -1) {
3825 struct stat buf;
3826 close(fd);
3827 while (::stat(filename, &buf) == 0) {
3828 Sleep(100);
3829 }
3830 } else {
3831 jio_fprintf(stderr,
3832 "Could not open pause file '%s', continuing immediately.\n", filename);
3833 }
3834 }
3835
3836 // An Event wraps a win32 "CreateEvent" kernel handle.
3837 //
3838 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
3839 //
3840 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
3841 // field, and call CloseHandle() on the win32 event handle. Unpark() would
3842 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
3843 // In addition, an unpark() operation might fetch the handle field, but the
3844 // event could recycle between the fetch and the SetEvent() operation.
3845 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
3846 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
3847 // on an stale but recycled handle would be harmless, but in practice this might
3848 // confuse other non-Sun code, so it's not a viable approach.
3849 //
3850 // 2: Once a win32 event handle is associated with an Event, it remains associated
3851 // with the Event. The event handle is never closed. This could be construed
3852 // as handle leakage, but only up to the maximum # of threads that have been extant
3853 // at any one time. This shouldn't be an issue, as windows platforms typically
3854 // permit a process to have hundreds of thousands of open handles.
3855 //
3856 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
3857 // and release unused handles.
3858 //
3859 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
3860 // It's not clear, however, that we wouldn't be trading one type of leak for another.
3861 //
3862 // 5. Use an RCU-like mechanism (Read-Copy Update).
3863 // Or perhaps something similar to Maged Michael's "Hazard pointers".
3864 //
3865 // We use (2).
3866 //
3867 // TODO-FIXME:
3868 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
3869 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
3870 // to recover from (or at least detect) the dreaded Windows 841176 bug.
3871 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
3872 // into a single win32 CreateEvent() handle.
3873 //
3874 // _Event transitions in park()
3875 // -1 => -1 : illegal
3876 // 1 => 0 : pass - return immediately
3877 // 0 => -1 : block
3878 //
3879 // _Event serves as a restricted-range semaphore :
3880 // -1 : thread is blocked
3881 // 0 : neutral - thread is running or ready
3882 // 1 : signaled - thread is running or ready
3883 //
3884 // Another possible encoding of _Event would be
3885 // with explicit "PARKED" and "SIGNALED" bits.
3886
3887 int os::PlatformEvent::park (jlong Millis) {
3888 guarantee (_ParkHandle != NULL , "Invariant") ;
3889 guarantee (Millis > 0 , "Invariant") ;
3890 int v ;
3891
3892 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
3893 // the initial park() operation.
3894
3895 for (;;) {
3896 v = _Event ;
3897 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
3898 }
3899 guarantee ((v == 0) || (v == 1), "invariant") ;
3900 if (v != 0) return OS_OK ;
3901
3902 // Do this the hard way by blocking ...
3903 // TODO: consider a brief spin here, gated on the success of recent
3904 // spin attempts by this thread.
3905 //
3906 // We decompose long timeouts into series of shorter timed waits.
3907 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
3908 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
3909 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
3910 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
3911 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
3912 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
3913 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
3914 // for the already waited time. This policy does not admit any new outcomes.
3915 // In the future, however, we might want to track the accumulated wait time and
3916 // adjust Millis accordingly if we encounter a spurious wakeup.
3917
3918 const int MAXTIMEOUT = 0x10000000 ;
3919 DWORD rv = WAIT_TIMEOUT ;
3920 while (_Event < 0 && Millis > 0) {
3921 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
3922 if (Millis > MAXTIMEOUT) {
3923 prd = MAXTIMEOUT ;
3924 }
3925 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
3926 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
3927 if (rv == WAIT_TIMEOUT) {
3928 Millis -= prd ;
3929 }
3930 }
3931 v = _Event ;
3932 _Event = 0 ;
3933 OrderAccess::fence() ;
3934 // If we encounter a nearly simultanous timeout expiry and unpark()
3935 // we return OS_OK indicating we awoke via unpark().
3936 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
3937 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
3938 }
3939
3940 void os::PlatformEvent::park () {
3941 guarantee (_ParkHandle != NULL, "Invariant") ;
3942 // Invariant: Only the thread associated with the Event/PlatformEvent
3943 // may call park().
3944 int v ;
3945 for (;;) {
3946 v = _Event ;
3947 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
3948 }
3949 guarantee ((v == 0) || (v == 1), "invariant") ;
3950 if (v != 0) return ;
3951
3952 // Do this the hard way by blocking ...
3953 // TODO: consider a brief spin here, gated on the success of recent
3954 // spin attempts by this thread.
3955 while (_Event < 0) {
3956 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
3957 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
3958 }
3959
3960 // Usually we'll find _Event == 0 at this point, but as
3961 // an optional optimization we clear it, just in case can
3962 // multiple unpark() operations drove _Event up to 1.
3963 _Event = 0 ;
3964 OrderAccess::fence() ;
3965 guarantee (_Event >= 0, "invariant") ;
3966 }
3967
3968 void os::PlatformEvent::unpark() {
3969 guarantee (_ParkHandle != NULL, "Invariant") ;
3970 int v ;
3971 for (;;) {
3972 v = _Event ; // Increment _Event if it's < 1.
3973 if (v > 0) {
3974 // If it's already signaled just return.
3975 // The LD of _Event could have reordered or be satisfied
3976 // by a read-aside from this processor's write buffer.
3977 // To avoid problems execute a barrier and then
3978 // ratify the value. A degenerate CAS() would also work.
3979 // Viz., CAS (v+0, &_Event, v) == v).
3980 OrderAccess::fence() ;
3981 if (_Event == v) return ;
3982 continue ;
3983 }
3984 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
3985 }
3986 if (v < 0) {
3987 ::SetEvent (_ParkHandle) ;
3988 }
3989 }
3990
3991
3992 // JSR166
3993 // -------------------------------------------------------
3994
3995 /*
3996 * The Windows implementation of Park is very straightforward: Basic
3997 * operations on Win32 Events turn out to have the right semantics to
3998 * use them directly. We opportunistically resuse the event inherited
3999 * from Monitor.
4000 */
4001
4002
4003 void Parker::park(bool isAbsolute, jlong time) {
4004 guarantee (_ParkEvent != NULL, "invariant") ;
4005 // First, demultiplex/decode time arguments
4006 if (time < 0) { // don't wait
4007 return;
4008 }
4009 else if (time == 0 && !isAbsolute) {
4010 time = INFINITE;
4011 }
4012 else if (isAbsolute) {
4013 time -= os::javaTimeMillis(); // convert to relative time
4014 if (time <= 0) // already elapsed
4015 return;
4016 }
4017 else { // relative
4018 time /= 1000000; // Must coarsen from nanos to millis
4019 if (time == 0) // Wait for the minimal time unit if zero
4020 time = 1;
4021 }
4022
4023 JavaThread* thread = (JavaThread*)(Thread::current());
4024 assert(thread->is_Java_thread(), "Must be JavaThread");
4025 JavaThread *jt = (JavaThread *)thread;
4026
4027 // Don't wait if interrupted or already triggered
4028 if (Thread::is_interrupted(thread, false) ||
4029 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4030 ResetEvent(_ParkEvent);
4031 return;
4032 }
4033 else {
4034 ThreadBlockInVM tbivm(jt);
4035 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4036 jt->set_suspend_equivalent();
4037
4038 WaitForSingleObject(_ParkEvent, time);
4039 ResetEvent(_ParkEvent);
4040
4041 // If externally suspended while waiting, re-suspend
4042 if (jt->handle_special_suspend_equivalent_condition()) {
4043 jt->java_suspend_self();
4044 }
4045 }
4046 }
4047
4048 void Parker::unpark() {
4049 guarantee (_ParkEvent != NULL, "invariant") ;
4050 SetEvent(_ParkEvent);
4051 }
4052
4053 // Run the specified command in a separate process. Return its exit value,
4054 // or -1 on failure (e.g. can't create a new process).
4055 int os::fork_and_exec(char* cmd) {
4056 STARTUPINFO si;
4057 PROCESS_INFORMATION pi;
4058
4059 memset(&si, 0, sizeof(si));
4060 si.cb = sizeof(si);
4061 memset(&pi, 0, sizeof(pi));
4062 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4063 cmd, // command line
4064 NULL, // process security attribute
4065 NULL, // thread security attribute
4066 TRUE, // inherits system handles
4067 0, // no creation flags
4068 NULL, // use parent's environment block
4069 NULL, // use parent's starting directory
4070 &si, // (in) startup information
4071 &pi); // (out) process information
4072
4073 if (rslt) {
4074 // Wait until child process exits.
4075 WaitForSingleObject(pi.hProcess, INFINITE);
4076
4077 DWORD exit_code;
4078 GetExitCodeProcess(pi.hProcess, &exit_code);
4079
4080 // Close process and thread handles.
4081 CloseHandle(pi.hProcess);
4082 CloseHandle(pi.hThread);
4083
4084 return (int)exit_code;
4085 } else {
4086 return -1;
4087 }
4088 }
4089
4090 //--------------------------------------------------------------------------------------------------
4091 // Non-product code
4092
4093 static int mallocDebugIntervalCounter = 0;
4094 static int mallocDebugCounter = 0;
4095 bool os::check_heap(bool force) {
4096 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
4097 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
4098 // Note: HeapValidate executes two hardware breakpoints when it finds something
4099 // wrong; at these points, eax contains the address of the offending block (I think).
4100 // To get to the exlicit error message(s) below, just continue twice.
4101 HANDLE heap = GetProcessHeap();
4102 { HeapLock(heap);
4103 PROCESS_HEAP_ENTRY phe;
4104 phe.lpData = NULL;
4105 while (HeapWalk(heap, &phe) != 0) {
4106 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
4107 !HeapValidate(heap, 0, phe.lpData)) {
4108 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
4109 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
4110 fatal("corrupted C heap");
4111 }
4112 }
4113 int err = GetLastError();
4114 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
4115 fatal(err_msg("heap walk aborted with error %d", err));
4116 }
4117 HeapUnlock(heap);
4118 }
4119 mallocDebugIntervalCounter = 0;
4120 }
4121 return true;
4122 }
4123
4124
4125 bool os::find(address addr, outputStream* st) {
4126 // Nothing yet
4127 return false;
4128 }
4129
4130 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
4131 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
4132
4133 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
4134 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
4135 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
4136 address addr = (address) exceptionRecord->ExceptionInformation[1];
4137
4138 if (os::is_memory_serialize_page(thread, addr))
4139 return EXCEPTION_CONTINUE_EXECUTION;
4140 }
4141
4142 return EXCEPTION_CONTINUE_SEARCH;
4143 }
4144
4145 static int getLastErrorString(char *buf, size_t len)
4146 {
4147 long errval;
4148
4149 if ((errval = GetLastError()) != 0)
4150 {
4151 /* DOS error */
4152 size_t n = (size_t)FormatMessage(
4153 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
4154 NULL,
4155 errval,
4156 0,
4157 buf,
4158 (DWORD)len,
4159 NULL);
4160 if (n > 3) {
4161 /* Drop final '.', CR, LF */
4162 if (buf[n - 1] == '\n') n--;
4163 if (buf[n - 1] == '\r') n--;
4164 if (buf[n - 1] == '.') n--;
4165 buf[n] = '\0';
4166 }
4167 return (int)n;
4168 }
4169
4170 if (errno != 0)
4171 {
4172 /* C runtime error that has no corresponding DOS error code */
4173 const char *s = strerror(errno);
4174 size_t n = strlen(s);
4175 if (n >= len) n = len - 1;
4176 strncpy(buf, s, n);
4177 buf[n] = '\0';
4178 return (int)n;
4179 }
4180 return 0;
4181 }
4182
4183
4184 // We don't build a headless jre for Windows
4185 bool os::is_headless_jre() { return false; }
4186