1 /*
2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
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 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
146 #endif
147 void os::init_system_properties_values() {
148 /* sysclasspath, java_home, dll_dir */
149 {
150 char *home_path;
151 char *dll_path;
152 char *pslash;
153 char *bin = "\\bin";
154 char home_dir[MAX_PATH];
155
156 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
157 os::jvm_path(home_dir, sizeof(home_dir));
158 // Found the full path to jvm[_g].dll.
159 // Now cut the path to <java_home>/jre if we can.
160 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
161 pslash = strrchr(home_dir, '\\');
162 if (pslash != NULL) {
163 *pslash = '\0'; /* get rid of \{client|server} */
164 pslash = strrchr(home_dir, '\\');
165 if (pslash != NULL)
166 *pslash = '\0'; /* get rid of \bin */
167 }
168 }
169
170 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1);
171 if (home_path == NULL)
172 return;
173 strcpy(home_path, home_dir);
174 Arguments::set_java_home(home_path);
175
176 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1);
177 if (dll_path == NULL)
178 return;
179 strcpy(dll_path, home_dir);
180 strcat(dll_path, bin);
181 Arguments::set_dll_dir(dll_path);
182
183 if (!set_boot_path('\\', ';'))
184 return;
185 }
186
187 /* library_path */
188 #define EXT_DIR "\\lib\\ext"
189 #define BIN_DIR "\\bin"
190 #define PACKAGE_DIR "\\Sun\\Java"
191 {
192 /* Win32 library search order (See the documentation for LoadLibrary):
193 *
194 * 1. The directory from which application is loaded.
195 * 2. The current directory
196 * 3. The system wide Java Extensions directory (Java only)
197 * 4. System directory (GetSystemDirectory)
198 * 5. Windows directory (GetWindowsDirectory)
199 * 6. The PATH environment variable
200 */
201
202 char *library_path;
203 char tmp[MAX_PATH];
204 char *path_str = ::getenv("PATH");
205
206 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
207 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10);
208
209 library_path[0] = '\0';
210
211 GetModuleFileName(NULL, tmp, sizeof(tmp));
212 *(strrchr(tmp, '\\')) = '\0';
213 strcat(library_path, tmp);
214
215 strcat(library_path, ";.");
216
217 GetWindowsDirectory(tmp, sizeof(tmp));
218 strcat(library_path, ";");
219 strcat(library_path, tmp);
220 strcat(library_path, PACKAGE_DIR BIN_DIR);
221
222 GetSystemDirectory(tmp, sizeof(tmp));
223 strcat(library_path, ";");
224 strcat(library_path, tmp);
225
226 GetWindowsDirectory(tmp, sizeof(tmp));
227 strcat(library_path, ";");
228 strcat(library_path, tmp);
229
230 if (path_str) {
231 strcat(library_path, ";");
232 strcat(library_path, path_str);
233 }
234
235 Arguments::set_library_path(library_path);
236 FREE_C_HEAP_ARRAY(char, library_path);
237 }
238
239 /* Default extensions directory */
240 {
241 char path[MAX_PATH];
242 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
243 GetWindowsDirectory(path, MAX_PATH);
244 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
245 path, PACKAGE_DIR, EXT_DIR);
246 Arguments::set_ext_dirs(buf);
247 }
248 #undef EXT_DIR
249 #undef BIN_DIR
250 #undef PACKAGE_DIR
251
252 /* Default endorsed standards directory. */
253 {
254 #define ENDORSED_DIR "\\lib\\endorsed"
255 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
256 char * buf = NEW_C_HEAP_ARRAY(char, len);
257 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
258 Arguments::set_endorsed_dirs(buf);
259 #undef ENDORSED_DIR
260 }
261
262 #ifndef _WIN64
263 SetUnhandledExceptionFilter(Handle_FLT_Exception);
264 #endif
265
266 // Done
267 return;
268 }
269
270 void os::breakpoint() {
271 DebugBreak();
272 }
273
274 // Invoked from the BREAKPOINT Macro
275 extern "C" void breakpoint() {
276 os::breakpoint();
277 }
278
279 // Returns an estimate of the current stack pointer. Result must be guaranteed
280 // to point into the calling threads stack, and be no lower than the current
281 // stack pointer.
282
283 address os::current_stack_pointer() {
284 int dummy;
285 address sp = (address)&dummy;
286 return sp;
287 }
288
289 // os::current_stack_base()
290 //
291 // Returns the base of the stack, which is the stack's
292 // starting address. This function must be called
293 // while running on the stack of the thread being queried.
294
295 address os::current_stack_base() {
296 MEMORY_BASIC_INFORMATION minfo;
297 address stack_bottom;
298 size_t stack_size;
299
300 VirtualQuery(&minfo, &minfo, sizeof(minfo));
301 stack_bottom = (address)minfo.AllocationBase;
302 stack_size = minfo.RegionSize;
303
304 // Add up the sizes of all the regions with the same
305 // AllocationBase.
306 while( 1 )
307 {
308 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
309 if ( stack_bottom == (address)minfo.AllocationBase )
310 stack_size += minfo.RegionSize;
311 else
312 break;
313 }
314
315 #ifdef _M_IA64
316 // IA64 has memory and register stacks
317 stack_size = stack_size / 2;
318 #endif
319 return stack_bottom + stack_size;
320 }
321
322 size_t os::current_stack_size() {
323 size_t sz;
324 MEMORY_BASIC_INFORMATION minfo;
325 VirtualQuery(&minfo, &minfo, sizeof(minfo));
326 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
327 return sz;
328 }
329
330 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
331 const struct tm* time_struct_ptr = localtime(clock);
332 if (time_struct_ptr != NULL) {
333 *res = *time_struct_ptr;
334 return res;
335 }
336 return NULL;
337 }
338
339 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
340
341 // Thread start routine for all new Java threads
342 static unsigned __stdcall java_start(Thread* thread) {
343 // Try to randomize the cache line index of hot stack frames.
344 // This helps when threads of the same stack traces evict each other's
345 // cache lines. The threads can be either from the same JVM instance, or
346 // from different JVM instances. The benefit is especially true for
347 // processors with hyperthreading technology.
348 static int counter = 0;
349 int pid = os::current_process_id();
350 _alloca(((pid ^ counter++) & 7) * 128);
351
352 OSThread* osthr = thread->osthread();
353 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
354
355 if (UseNUMA) {
356 int lgrp_id = os::numa_get_group_id();
357 if (lgrp_id != -1) {
358 thread->set_lgrp_id(lgrp_id);
359 }
360 }
361
362
363 if (UseVectoredExceptions) {
364 // If we are using vectored exception we don't need to set a SEH
365 thread->run();
366 }
367 else {
368 // Install a win32 structured exception handler around every thread created
369 // by VM, so VM can genrate error dump when an exception occurred in non-
370 // Java thread (e.g. VM thread).
371 __try {
372 thread->run();
373 } __except(topLevelExceptionFilter(
374 (_EXCEPTION_POINTERS*)_exception_info())) {
375 // Nothing to do.
376 }
377 }
378
379 // One less thread is executing
380 // When the VMThread gets here, the main thread may have already exited
381 // which frees the CodeHeap containing the Atomic::add code
382 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
383 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
384 }
385
386 return 0;
387 }
388
389 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
390 // Allocate the OSThread object
391 OSThread* osthread = new OSThread(NULL, NULL);
392 if (osthread == NULL) return NULL;
393
394 // Initialize support for Java interrupts
395 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
396 if (interrupt_event == NULL) {
397 delete osthread;
398 return NULL;
399 }
400 osthread->set_interrupt_event(interrupt_event);
401
402 // Store info on the Win32 thread into the OSThread
403 osthread->set_thread_handle(thread_handle);
404 osthread->set_thread_id(thread_id);
405
406 if (UseNUMA) {
407 int lgrp_id = os::numa_get_group_id();
408 if (lgrp_id != -1) {
409 thread->set_lgrp_id(lgrp_id);
410 }
411 }
412
413 // Initial thread state is INITIALIZED, not SUSPENDED
414 osthread->set_state(INITIALIZED);
415
416 return osthread;
417 }
418
419
420 bool os::create_attached_thread(JavaThread* thread) {
421 #ifdef ASSERT
422 thread->verify_not_published();
423 #endif
424 HANDLE thread_h;
425 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
426 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
427 fatal("DuplicateHandle failed\n");
428 }
429 OSThread* osthread = create_os_thread(thread, thread_h,
430 (int)current_thread_id());
431 if (osthread == NULL) {
432 return false;
433 }
434
435 // Initial thread state is RUNNABLE
436 osthread->set_state(RUNNABLE);
437
438 thread->set_osthread(osthread);
439 return true;
440 }
441
442 bool os::create_main_thread(JavaThread* thread) {
443 #ifdef ASSERT
444 thread->verify_not_published();
445 #endif
446 if (_starting_thread == NULL) {
447 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
448 if (_starting_thread == NULL) {
449 return false;
450 }
451 }
452
453 // The primordial thread is runnable from the start)
454 _starting_thread->set_state(RUNNABLE);
455
456 thread->set_osthread(_starting_thread);
457 return true;
458 }
459
460 // Allocate and initialize a new OSThread
461 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
462 unsigned thread_id;
463
464 // Allocate the OSThread object
465 OSThread* osthread = new OSThread(NULL, NULL);
466 if (osthread == NULL) {
467 return false;
468 }
469
470 // Initialize support for Java interrupts
471 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
472 if (interrupt_event == NULL) {
473 delete osthread;
474 return NULL;
475 }
476 osthread->set_interrupt_event(interrupt_event);
477 osthread->set_interrupted(false);
478
479 thread->set_osthread(osthread);
480
481 if (stack_size == 0) {
482 switch (thr_type) {
483 case os::java_thread:
484 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
485 if (JavaThread::stack_size_at_create() > 0)
486 stack_size = JavaThread::stack_size_at_create();
487 break;
488 case os::compiler_thread:
489 if (CompilerThreadStackSize > 0) {
490 stack_size = (size_t)(CompilerThreadStackSize * K);
491 break;
492 } // else fall through:
493 // use VMThreadStackSize if CompilerThreadStackSize is not defined
494 case os::vm_thread:
495 case os::pgc_thread:
496 case os::cgc_thread:
497 case os::watcher_thread:
498 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
499 break;
500 }
501 }
502
503 // Create the Win32 thread
504 //
505 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
506 // does not specify stack size. Instead, it specifies the size of
507 // initially committed space. The stack size is determined by
508 // PE header in the executable. If the committed "stack_size" is larger
509 // than default value in the PE header, the stack is rounded up to the
510 // nearest multiple of 1MB. For example if the launcher has default
511 // stack size of 320k, specifying any size less than 320k does not
512 // affect the actual stack size at all, it only affects the initial
513 // commitment. On the other hand, specifying 'stack_size' larger than
514 // default value may cause significant increase in memory usage, because
515 // not only the stack space will be rounded up to MB, but also the
516 // entire space is committed upfront.
517 //
518 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
519 // for CreateThread() that can treat 'stack_size' as stack size. However we
520 // are not supposed to call CreateThread() directly according to MSDN
521 // document because JVM uses C runtime library. The good news is that the
522 // flag appears to work with _beginthredex() as well.
523
524 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
525 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
526 #endif
527
528 HANDLE thread_handle =
529 (HANDLE)_beginthreadex(NULL,
530 (unsigned)stack_size,
531 (unsigned (__stdcall *)(void*)) java_start,
532 thread,
533 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
534 &thread_id);
535 if (thread_handle == NULL) {
536 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
537 // without the flag.
538 thread_handle =
539 (HANDLE)_beginthreadex(NULL,
540 (unsigned)stack_size,
541 (unsigned (__stdcall *)(void*)) java_start,
542 thread,
543 CREATE_SUSPENDED,
544 &thread_id);
545 }
546 if (thread_handle == NULL) {
547 // Need to clean up stuff we've allocated so far
548 CloseHandle(osthread->interrupt_event());
549 thread->set_osthread(NULL);
550 delete osthread;
551 return NULL;
552 }
553
554 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
555
556 // Store info on the Win32 thread into the OSThread
557 osthread->set_thread_handle(thread_handle);
558 osthread->set_thread_id(thread_id);
559
560 // Initial thread state is INITIALIZED, not SUSPENDED
561 osthread->set_state(INITIALIZED);
562
563 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
564 return true;
565 }
566
567
568 // Free Win32 resources related to the OSThread
569 void os::free_thread(OSThread* osthread) {
570 assert(osthread != NULL, "osthread not set");
571 CloseHandle(osthread->thread_handle());
572 CloseHandle(osthread->interrupt_event());
573 delete osthread;
574 }
575
576
577 static int has_performance_count = 0;
578 static jlong first_filetime;
579 static jlong initial_performance_count;
580 static jlong performance_frequency;
581
582
583 jlong as_long(LARGE_INTEGER x) {
584 jlong result = 0; // initialization to avoid warning
585 set_high(&result, x.HighPart);
586 set_low(&result, x.LowPart);
587 return result;
588 }
589
590
591 jlong os::elapsed_counter() {
592 LARGE_INTEGER count;
593 if (has_performance_count) {
594 QueryPerformanceCounter(&count);
595 return as_long(count) - initial_performance_count;
596 } else {
597 FILETIME wt;
598 GetSystemTimeAsFileTime(&wt);
599 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
600 }
601 }
602
603
604 jlong os::elapsed_frequency() {
605 if (has_performance_count) {
606 return performance_frequency;
607 } else {
608 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
609 return 10000000;
610 }
611 }
612
613
614 julong os::available_memory() {
615 return win32::available_memory();
616 }
617
618 julong os::win32::available_memory() {
619 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
620 // value if total memory is larger than 4GB
621 MEMORYSTATUSEX ms;
622 ms.dwLength = sizeof(ms);
623 GlobalMemoryStatusEx(&ms);
624
625 return (julong)ms.ullAvailPhys;
626 }
627
628 julong os::physical_memory() {
629 return win32::physical_memory();
630 }
631
632 julong os::allocatable_physical_memory(julong size) {
633 #ifdef _LP64
634 return size;
635 #else
636 // Limit to 1400m because of the 2gb address space wall
637 return MIN2(size, (julong)1400*M);
638 #endif
639 }
640
641 // VC6 lacks DWORD_PTR
642 #if _MSC_VER < 1300
643 typedef UINT_PTR DWORD_PTR;
644 #endif
645
646 int os::active_processor_count() {
647 DWORD_PTR lpProcessAffinityMask = 0;
648 DWORD_PTR lpSystemAffinityMask = 0;
649 int proc_count = processor_count();
650 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
651 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
652 // Nof active processors is number of bits in process affinity mask
653 int bitcount = 0;
654 while (lpProcessAffinityMask != 0) {
655 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
656 bitcount++;
657 }
658 return bitcount;
659 } else {
660 return proc_count;
661 }
662 }
663
664 bool os::distribute_processes(uint length, uint* distribution) {
665 // Not yet implemented.
666 return false;
667 }
668
669 bool os::bind_to_processor(uint processor_id) {
670 // Not yet implemented.
671 return false;
672 }
673
674 static void initialize_performance_counter() {
675 LARGE_INTEGER count;
676 if (QueryPerformanceFrequency(&count)) {
677 has_performance_count = 1;
678 performance_frequency = as_long(count);
679 QueryPerformanceCounter(&count);
680 initial_performance_count = as_long(count);
681 } else {
682 has_performance_count = 0;
683 FILETIME wt;
684 GetSystemTimeAsFileTime(&wt);
685 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
686 }
687 }
688
689
690 double os::elapsedTime() {
691 return (double) elapsed_counter() / (double) elapsed_frequency();
692 }
693
694
695 // Windows format:
696 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
697 // Java format:
698 // Java standards require the number of milliseconds since 1/1/1970
699
700 // Constant offset - calculated using offset()
701 static jlong _offset = 116444736000000000;
702 // Fake time counter for reproducible results when debugging
703 static jlong fake_time = 0;
704
705 #ifdef ASSERT
706 // Just to be safe, recalculate the offset in debug mode
707 static jlong _calculated_offset = 0;
708 static int _has_calculated_offset = 0;
709
710 jlong offset() {
711 if (_has_calculated_offset) return _calculated_offset;
712 SYSTEMTIME java_origin;
713 java_origin.wYear = 1970;
714 java_origin.wMonth = 1;
715 java_origin.wDayOfWeek = 0; // ignored
716 java_origin.wDay = 1;
717 java_origin.wHour = 0;
718 java_origin.wMinute = 0;
719 java_origin.wSecond = 0;
720 java_origin.wMilliseconds = 0;
721 FILETIME jot;
722 if (!SystemTimeToFileTime(&java_origin, &jot)) {
723 fatal1("Error = %d\nWindows error", GetLastError());
724 }
725 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
726 _has_calculated_offset = 1;
727 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
728 return _calculated_offset;
729 }
730 #else
731 jlong offset() {
732 return _offset;
733 }
734 #endif
735
736 jlong windows_to_java_time(FILETIME wt) {
737 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
738 return (a - offset()) / 10000;
739 }
740
741 FILETIME java_to_windows_time(jlong l) {
742 jlong a = (l * 10000) + offset();
743 FILETIME result;
744 result.dwHighDateTime = high(a);
745 result.dwLowDateTime = low(a);
746 return result;
747 }
748
749 // For now, we say that Windows does not support vtime. I have no idea
750 // whether it can actually be made to (DLD, 9/13/05).
751
752 bool os::supports_vtime() { return false; }
753 bool os::enable_vtime() { return false; }
754 bool os::vtime_enabled() { return false; }
755 double os::elapsedVTime() {
756 // better than nothing, but not much
757 return elapsedTime();
758 }
759
760 jlong os::javaTimeMillis() {
761 if (UseFakeTimers) {
762 return fake_time++;
763 } else {
764 FILETIME wt;
765 GetSystemTimeAsFileTime(&wt);
766 return windows_to_java_time(wt);
767 }
768 }
769
770 #define NANOS_PER_SEC CONST64(1000000000)
771 #define NANOS_PER_MILLISEC 1000000
772 jlong os::javaTimeNanos() {
773 if (!has_performance_count) {
774 return javaTimeMillis() * NANOS_PER_MILLISEC; // the best we can do.
775 } else {
776 LARGE_INTEGER current_count;
777 QueryPerformanceCounter(¤t_count);
778 double current = as_long(current_count);
779 double freq = performance_frequency;
780 jlong time = (jlong)((current/freq) * NANOS_PER_SEC);
781 return time;
782 }
783 }
784
785 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
786 if (!has_performance_count) {
787 // javaTimeMillis() doesn't have much percision,
788 // but it is not going to wrap -- so all 64 bits
789 info_ptr->max_value = ALL_64_BITS;
790
791 // this is a wall clock timer, so may skip
792 info_ptr->may_skip_backward = true;
793 info_ptr->may_skip_forward = true;
794 } else {
795 jlong freq = performance_frequency;
796 if (freq < NANOS_PER_SEC) {
797 // the performance counter is 64 bits and we will
798 // be multiplying it -- so no wrap in 64 bits
799 info_ptr->max_value = ALL_64_BITS;
800 } else if (freq > NANOS_PER_SEC) {
801 // use the max value the counter can reach to
802 // determine the max value which could be returned
803 julong max_counter = (julong)ALL_64_BITS;
804 info_ptr->max_value = (jlong)(max_counter / (freq / NANOS_PER_SEC));
805 } else {
806 // the performance counter is 64 bits and we will
807 // be using it directly -- so no wrap in 64 bits
808 info_ptr->max_value = ALL_64_BITS;
809 }
810
811 // using a counter, so no skipping
812 info_ptr->may_skip_backward = false;
813 info_ptr->may_skip_forward = false;
814 }
815 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
816 }
817
818 char* os::local_time_string(char *buf, size_t buflen) {
819 SYSTEMTIME st;
820 GetLocalTime(&st);
821 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
822 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
823 return buf;
824 }
825
826 bool os::getTimesSecs(double* process_real_time,
827 double* process_user_time,
828 double* process_system_time) {
829 HANDLE h_process = GetCurrentProcess();
830 FILETIME create_time, exit_time, kernel_time, user_time;
831 BOOL result = GetProcessTimes(h_process,
832 &create_time,
833 &exit_time,
834 &kernel_time,
835 &user_time);
836 if (result != 0) {
837 FILETIME wt;
838 GetSystemTimeAsFileTime(&wt);
839 jlong rtc_millis = windows_to_java_time(wt);
840 jlong user_millis = windows_to_java_time(user_time);
841 jlong system_millis = windows_to_java_time(kernel_time);
842 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
843 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
844 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
845 return true;
846 } else {
847 return false;
848 }
849 }
850
851 void os::shutdown() {
852
853 // allow PerfMemory to attempt cleanup of any persistent resources
854 perfMemory_exit();
855
856 // flush buffered output, finish log files
857 ostream_abort();
858
859 // Check for abort hook
860 abort_hook_t abort_hook = Arguments::abort_hook();
861 if (abort_hook != NULL) {
862 abort_hook();
863 }
864 }
865
866 void os::abort(bool dump_core)
867 {
868 os::shutdown();
869 // no core dump on Windows
870 ::exit(1);
871 }
872
873 // Die immediately, no exit hook, no abort hook, no cleanup.
874 void os::die() {
875 _exit(-1);
876 }
877
878 // Directory routines copied from src/win32/native/java/io/dirent_md.c
879 // * dirent_md.c 1.15 00/02/02
880 //
881 // The declarations for DIR and struct dirent are in jvm_win32.h.
882
883 /* Caller must have already run dirname through JVM_NativePath, which removes
884 duplicate slashes and converts all instances of '/' into '\\'. */
885
886 DIR *
887 os::opendir(const char *dirname)
888 {
889 assert(dirname != NULL, "just checking"); // hotspot change
890 DIR *dirp = (DIR *)malloc(sizeof(DIR));
891 DWORD fattr; // hotspot change
892 char alt_dirname[4] = { 0, 0, 0, 0 };
893
894 if (dirp == 0) {
895 errno = ENOMEM;
896 return 0;
897 }
898
899 /*
900 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
901 * as a directory in FindFirstFile(). We detect this case here and
902 * prepend the current drive name.
903 */
904 if (dirname[1] == '\0' && dirname[0] == '\\') {
905 alt_dirname[0] = _getdrive() + 'A' - 1;
906 alt_dirname[1] = ':';
907 alt_dirname[2] = '\\';
908 alt_dirname[3] = '\0';
909 dirname = alt_dirname;
910 }
911
912 dirp->path = (char *)malloc(strlen(dirname) + 5);
913 if (dirp->path == 0) {
914 free(dirp);
915 errno = ENOMEM;
916 return 0;
917 }
918 strcpy(dirp->path, dirname);
919
920 fattr = GetFileAttributes(dirp->path);
921 if (fattr == 0xffffffff) {
922 free(dirp->path);
923 free(dirp);
924 errno = ENOENT;
925 return 0;
926 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
927 free(dirp->path);
928 free(dirp);
929 errno = ENOTDIR;
930 return 0;
931 }
932
933 /* Append "*.*", or possibly "\\*.*", to path */
934 if (dirp->path[1] == ':'
935 && (dirp->path[2] == '\0'
936 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
937 /* No '\\' needed for cases like "Z:" or "Z:\" */
938 strcat(dirp->path, "*.*");
939 } else {
940 strcat(dirp->path, "\\*.*");
941 }
942
943 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
944 if (dirp->handle == INVALID_HANDLE_VALUE) {
945 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
946 free(dirp->path);
947 free(dirp);
948 errno = EACCES;
949 return 0;
950 }
951 }
952 return dirp;
953 }
954
955 /* parameter dbuf unused on Windows */
956
957 struct dirent *
958 os::readdir(DIR *dirp, dirent *dbuf)
959 {
960 assert(dirp != NULL, "just checking"); // hotspot change
961 if (dirp->handle == INVALID_HANDLE_VALUE) {
962 return 0;
963 }
964
965 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
966
967 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
968 if (GetLastError() == ERROR_INVALID_HANDLE) {
969 errno = EBADF;
970 return 0;
971 }
972 FindClose(dirp->handle);
973 dirp->handle = INVALID_HANDLE_VALUE;
974 }
975
976 return &dirp->dirent;
977 }
978
979 int
980 os::closedir(DIR *dirp)
981 {
982 assert(dirp != NULL, "just checking"); // hotspot change
983 if (dirp->handle != INVALID_HANDLE_VALUE) {
984 if (!FindClose(dirp->handle)) {
985 errno = EBADF;
986 return -1;
987 }
988 dirp->handle = INVALID_HANDLE_VALUE;
989 }
990 free(dirp->path);
991 free(dirp);
992 return 0;
993 }
994
995 const char* os::dll_file_extension() { return ".dll"; }
996
997 const char * os::get_temp_directory()
998 {
999 static char path_buf[MAX_PATH];
1000 if (GetTempPath(MAX_PATH, path_buf)>0)
1001 return path_buf;
1002 else{
1003 path_buf[0]='\0';
1004 return path_buf;
1005 }
1006 }
1007
1008 static bool file_exists(const char* filename) {
1009 if (filename == NULL || strlen(filename) == 0) {
1010 return false;
1011 }
1012 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1013 }
1014
1015 void os::dll_build_name(char *buffer, size_t buflen,
1016 const char* pname, const char* fname) {
1017 // Copied from libhpi
1018 const size_t pnamelen = pname ? strlen(pname) : 0;
1019 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1020
1021 // Quietly truncates on buffer overflow. Should be an error.
1022 if (pnamelen + strlen(fname) + 10 > buflen) {
1023 *buffer = '\0';
1024 return;
1025 }
1026
1027 if (pnamelen == 0) {
1028 jio_snprintf(buffer, buflen, "%s.dll", fname);
1029 } else if (c == ':' || c == '\\') {
1030 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1031 } else if (strchr(pname, *os::path_separator()) != NULL) {
1032 int n;
1033 char** pelements = split_path(pname, &n);
1034 for (int i = 0 ; i < n ; i++) {
1035 char* path = pelements[i];
1036 // Really shouldn't be NULL, but check can't hurt
1037 size_t plen = (path == NULL) ? 0 : strlen(path);
1038 if (plen == 0) {
1039 continue; // skip the empty path values
1040 }
1041 const char lastchar = path[plen - 1];
1042 if (lastchar == ':' || lastchar == '\\') {
1043 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1044 } else {
1045 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1046 }
1047 if (file_exists(buffer)) {
1048 break;
1049 }
1050 }
1051 // release the storage
1052 for (int i = 0 ; i < n ; i++) {
1053 if (pelements[i] != NULL) {
1054 FREE_C_HEAP_ARRAY(char, pelements[i]);
1055 }
1056 }
1057 if (pelements != NULL) {
1058 FREE_C_HEAP_ARRAY(char*, pelements);
1059 }
1060 } else {
1061 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1062 }
1063 }
1064
1065 // Needs to be in os specific directory because windows requires another
1066 // header file <direct.h>
1067 const char* os::get_current_directory(char *buf, int buflen) {
1068 return _getcwd(buf, buflen);
1069 }
1070
1071 //-----------------------------------------------------------
1072 // Helper functions for fatal error handler
1073
1074 // The following library functions are resolved dynamically at runtime:
1075
1076 // PSAPI functions, for Windows NT, 2000, XP
1077
1078 // psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform
1079 // SDK from Microsoft. Here are the definitions copied from psapi.h
1080 typedef struct _MODULEINFO {
1081 LPVOID lpBaseOfDll;
1082 DWORD SizeOfImage;
1083 LPVOID EntryPoint;
1084 } MODULEINFO, *LPMODULEINFO;
1085
1086 static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD );
1087 static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD );
1088 static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD );
1089
1090 // ToolHelp Functions, for Windows 95, 98 and ME
1091
1092 static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ;
1093 static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ;
1094 static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ;
1095
1096 bool _has_psapi;
1097 bool _psapi_init = false;
1098 bool _has_toolhelp;
1099
1100 static bool _init_psapi() {
1101 HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ;
1102 if( psapi == NULL ) return false ;
1103
1104 _EnumProcessModules = CAST_TO_FN_PTR(
1105 BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD),
1106 GetProcAddress(psapi, "EnumProcessModules")) ;
1107 _GetModuleFileNameEx = CAST_TO_FN_PTR(
1108 DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD),
1109 GetProcAddress(psapi, "GetModuleFileNameExA"));
1110 _GetModuleInformation = CAST_TO_FN_PTR(
1111 BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD),
1112 GetProcAddress(psapi, "GetModuleInformation"));
1113
1114 _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation);
1115 _psapi_init = true;
1116 return _has_psapi;
1117 }
1118
1119 static bool _init_toolhelp() {
1120 HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ;
1121 if (kernel32 == NULL) return false ;
1122
1123 _CreateToolhelp32Snapshot = CAST_TO_FN_PTR(
1124 HANDLE(WINAPI *)(DWORD,DWORD),
1125 GetProcAddress(kernel32, "CreateToolhelp32Snapshot"));
1126 _Module32First = CAST_TO_FN_PTR(
1127 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1128 GetProcAddress(kernel32, "Module32First" ));
1129 _Module32Next = CAST_TO_FN_PTR(
1130 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1131 GetProcAddress(kernel32, "Module32Next" ));
1132
1133 _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next);
1134 return _has_toolhelp;
1135 }
1136
1137 #ifdef _WIN64
1138 // Helper routine which returns true if address in
1139 // within the NTDLL address space.
1140 //
1141 static bool _addr_in_ntdll( address addr )
1142 {
1143 HMODULE hmod;
1144 MODULEINFO minfo;
1145
1146 hmod = GetModuleHandle("NTDLL.DLL");
1147 if ( hmod == NULL ) return false;
1148 if ( !_GetModuleInformation( GetCurrentProcess(), hmod,
1149 &minfo, sizeof(MODULEINFO)) )
1150 return false;
1151
1152 if ( (addr >= minfo.lpBaseOfDll) &&
1153 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1154 return true;
1155 else
1156 return false;
1157 }
1158 #endif
1159
1160
1161 // Enumerate all modules for a given process ID
1162 //
1163 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1164 // different API for doing this. We use PSAPI.DLL on NT based
1165 // Windows and ToolHelp on 95/98/Me.
1166
1167 // Callback function that is called by enumerate_modules() on
1168 // every DLL module.
1169 // Input parameters:
1170 // int pid,
1171 // char* module_file_name,
1172 // address module_base_addr,
1173 // unsigned module_size,
1174 // void* param
1175 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1176
1177 // enumerate_modules for Windows NT, using PSAPI
1178 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1179 {
1180 HANDLE hProcess ;
1181
1182 # define MAX_NUM_MODULES 128
1183 HMODULE modules[MAX_NUM_MODULES];
1184 static char filename[ MAX_PATH ];
1185 int result = 0;
1186
1187 if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0;
1188
1189 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1190 FALSE, pid ) ;
1191 if (hProcess == NULL) return 0;
1192
1193 DWORD size_needed;
1194 if (!_EnumProcessModules(hProcess, modules,
1195 sizeof(modules), &size_needed)) {
1196 CloseHandle( hProcess );
1197 return 0;
1198 }
1199
1200 // number of modules that are currently loaded
1201 int num_modules = size_needed / sizeof(HMODULE);
1202
1203 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1204 // Get Full pathname:
1205 if(!_GetModuleFileNameEx(hProcess, modules[i],
1206 filename, sizeof(filename))) {
1207 filename[0] = '\0';
1208 }
1209
1210 MODULEINFO modinfo;
1211 if (!_GetModuleInformation(hProcess, modules[i],
1212 &modinfo, sizeof(modinfo))) {
1213 modinfo.lpBaseOfDll = NULL;
1214 modinfo.SizeOfImage = 0;
1215 }
1216
1217 // Invoke callback function
1218 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1219 modinfo.SizeOfImage, param);
1220 if (result) break;
1221 }
1222
1223 CloseHandle( hProcess ) ;
1224 return result;
1225 }
1226
1227
1228 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1229 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1230 {
1231 HANDLE hSnapShot ;
1232 static MODULEENTRY32 modentry ;
1233 int result = 0;
1234
1235 if (!_has_toolhelp) return 0;
1236
1237 // Get a handle to a Toolhelp snapshot of the system
1238 hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1239 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1240 return FALSE ;
1241 }
1242
1243 // iterate through all modules
1244 modentry.dwSize = sizeof(MODULEENTRY32) ;
1245 bool not_done = _Module32First( hSnapShot, &modentry ) != 0;
1246
1247 while( not_done ) {
1248 // invoke the callback
1249 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1250 modentry.modBaseSize, param);
1251 if (result) break;
1252
1253 modentry.dwSize = sizeof(MODULEENTRY32) ;
1254 not_done = _Module32Next( hSnapShot, &modentry ) != 0;
1255 }
1256
1257 CloseHandle(hSnapShot);
1258 return result;
1259 }
1260
1261 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1262 {
1263 // Get current process ID if caller doesn't provide it.
1264 if (!pid) pid = os::current_process_id();
1265
1266 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1267 else return _enumerate_modules_windows(pid, func, param);
1268 }
1269
1270 struct _modinfo {
1271 address addr;
1272 char* full_path; // point to a char buffer
1273 int buflen; // size of the buffer
1274 address base_addr;
1275 };
1276
1277 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1278 unsigned size, void * param) {
1279 struct _modinfo *pmod = (struct _modinfo *)param;
1280 if (!pmod) return -1;
1281
1282 if (base_addr <= pmod->addr &&
1283 base_addr+size > pmod->addr) {
1284 // if a buffer is provided, copy path name to the buffer
1285 if (pmod->full_path) {
1286 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1287 }
1288 pmod->base_addr = base_addr;
1289 return 1;
1290 }
1291 return 0;
1292 }
1293
1294 bool os::dll_address_to_library_name(address addr, char* buf,
1295 int buflen, int* offset) {
1296 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1297 // return the full path to the DLL file, sometimes it returns path
1298 // to the corresponding PDB file (debug info); sometimes it only
1299 // returns partial path, which makes life painful.
1300
1301 struct _modinfo mi;
1302 mi.addr = addr;
1303 mi.full_path = buf;
1304 mi.buflen = buflen;
1305 int pid = os::current_process_id();
1306 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1307 // buf already contains path name
1308 if (offset) *offset = addr - mi.base_addr;
1309 return true;
1310 } else {
1311 if (buf) buf[0] = '\0';
1312 if (offset) *offset = -1;
1313 return false;
1314 }
1315 }
1316
1317 bool os::dll_address_to_function_name(address addr, char *buf,
1318 int buflen, int *offset) {
1319 // Unimplemented on Windows - in order to use SymGetSymFromAddr(),
1320 // we need to initialize imagehlp/dbghelp, then load symbol table
1321 // for every module. That's too much work to do after a fatal error.
1322 // For an example on how to implement this function, see 1.4.2.
1323 if (offset) *offset = -1;
1324 if (buf) buf[0] = '\0';
1325 return false;
1326 }
1327
1328 void* os::dll_lookup(void* handle, const char* name) {
1329 return GetProcAddress((HMODULE)handle, name);
1330 }
1331
1332 // save the start and end address of jvm.dll into param[0] and param[1]
1333 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1334 unsigned size, void * param) {
1335 if (!param) return -1;
1336
1337 if (base_addr <= (address)_locate_jvm_dll &&
1338 base_addr+size > (address)_locate_jvm_dll) {
1339 ((address*)param)[0] = base_addr;
1340 ((address*)param)[1] = base_addr + size;
1341 return 1;
1342 }
1343 return 0;
1344 }
1345
1346 address vm_lib_location[2]; // start and end address of jvm.dll
1347
1348 // check if addr is inside jvm.dll
1349 bool os::address_is_in_vm(address addr) {
1350 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1351 int pid = os::current_process_id();
1352 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1353 assert(false, "Can't find jvm module.");
1354 return false;
1355 }
1356 }
1357
1358 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1359 }
1360
1361 // print module info; param is outputStream*
1362 static int _print_module(int pid, char* fname, address base,
1363 unsigned size, void* param) {
1364 if (!param) return -1;
1365
1366 outputStream* st = (outputStream*)param;
1367
1368 address end_addr = base + size;
1369 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1370 return 0;
1371 }
1372
1373 // Loads .dll/.so and
1374 // in case of error it checks if .dll/.so was built for the
1375 // same architecture as Hotspot is running on
1376 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1377 {
1378 void * result = LoadLibrary(name);
1379 if (result != NULL)
1380 {
1381 return result;
1382 }
1383
1384 long errcode = GetLastError();
1385 if (errcode == ERROR_MOD_NOT_FOUND) {
1386 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1387 ebuf[ebuflen-1]='\0';
1388 return NULL;
1389 }
1390
1391 // Parsing dll below
1392 // If we can read dll-info and find that dll was built
1393 // for an architecture other than Hotspot is running in
1394 // - then print to buffer "DLL was built for a different architecture"
1395 // else call getLastErrorString to obtain system error message
1396
1397 // Read system error message into ebuf
1398 // It may or may not be overwritten below (in the for loop and just above)
1399 getLastErrorString(ebuf, (size_t) ebuflen);
1400 ebuf[ebuflen-1]='\0';
1401 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1402 if (file_descriptor<0)
1403 {
1404 return NULL;
1405 }
1406
1407 uint32_t signature_offset;
1408 uint16_t lib_arch=0;
1409 bool failed_to_get_lib_arch=
1410 (
1411 //Go to position 3c in the dll
1412 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1413 ||
1414 // Read loacation of signature
1415 (sizeof(signature_offset)!=
1416 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1417 ||
1418 //Go to COFF File Header in dll
1419 //that is located after"signature" (4 bytes long)
1420 (os::seek_to_file_offset(file_descriptor,
1421 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1422 ||
1423 //Read field that contains code of architecture
1424 // that dll was build for
1425 (sizeof(lib_arch)!=
1426 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1427 );
1428
1429 ::close(file_descriptor);
1430 if (failed_to_get_lib_arch)
1431 {
1432 // file i/o error - report getLastErrorString(...) msg
1433 return NULL;
1434 }
1435
1436 typedef struct
1437 {
1438 uint16_t arch_code;
1439 char* arch_name;
1440 } arch_t;
1441
1442 static const arch_t arch_array[]={
1443 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1444 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1445 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1446 };
1447 #if (defined _M_IA64)
1448 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1449 #elif (defined _M_AMD64)
1450 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1451 #elif (defined _M_IX86)
1452 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1453 #else
1454 #error Method os::dll_load requires that one of following \
1455 is defined :_M_IA64,_M_AMD64 or _M_IX86
1456 #endif
1457
1458
1459 // Obtain a string for printf operation
1460 // lib_arch_str shall contain string what platform this .dll was built for
1461 // running_arch_str shall string contain what platform Hotspot was built for
1462 char *running_arch_str=NULL,*lib_arch_str=NULL;
1463 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1464 {
1465 if (lib_arch==arch_array[i].arch_code)
1466 lib_arch_str=arch_array[i].arch_name;
1467 if (running_arch==arch_array[i].arch_code)
1468 running_arch_str=arch_array[i].arch_name;
1469 }
1470
1471 assert(running_arch_str,
1472 "Didn't find runing architecture code in arch_array");
1473
1474 // If the architure is right
1475 // but some other error took place - report getLastErrorString(...) msg
1476 if (lib_arch == running_arch)
1477 {
1478 return NULL;
1479 }
1480
1481 if (lib_arch_str!=NULL)
1482 {
1483 ::_snprintf(ebuf, ebuflen-1,
1484 "Can't load %s-bit .dll on a %s-bit platform",
1485 lib_arch_str,running_arch_str);
1486 }
1487 else
1488 {
1489 // don't know what architecture this dll was build for
1490 ::_snprintf(ebuf, ebuflen-1,
1491 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1492 lib_arch,running_arch_str);
1493 }
1494
1495 return NULL;
1496 }
1497
1498
1499 void os::print_dll_info(outputStream *st) {
1500 int pid = os::current_process_id();
1501 st->print_cr("Dynamic libraries:");
1502 enumerate_modules(pid, _print_module, (void *)st);
1503 }
1504
1505 // function pointer to Windows API "GetNativeSystemInfo".
1506 typedef void (WINAPI *GetNativeSystemInfo_func_type)(LPSYSTEM_INFO);
1507 static GetNativeSystemInfo_func_type _GetNativeSystemInfo;
1508
1509 void os::print_os_info(outputStream* st) {
1510 st->print("OS:");
1511
1512 OSVERSIONINFOEX osvi;
1513 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1514 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1515
1516 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1517 st->print_cr("N/A");
1518 return;
1519 }
1520
1521 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1522 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1523 switch (os_vers) {
1524 case 3051: st->print(" Windows NT 3.51"); break;
1525 case 4000: st->print(" Windows NT 4.0"); break;
1526 case 5000: st->print(" Windows 2000"); break;
1527 case 5001: st->print(" Windows XP"); break;
1528 case 5002:
1529 case 6000:
1530 case 6001: {
1531 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1532 // find out whether we are running on 64 bit processor or not.
1533 SYSTEM_INFO si;
1534 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1535 // Check to see if _GetNativeSystemInfo has been initialized.
1536 if (_GetNativeSystemInfo == NULL) {
1537 HMODULE hKernel32 = GetModuleHandle(TEXT("kernel32.dll"));
1538 _GetNativeSystemInfo =
1539 CAST_TO_FN_PTR(GetNativeSystemInfo_func_type,
1540 GetProcAddress(hKernel32,
1541 "GetNativeSystemInfo"));
1542 if (_GetNativeSystemInfo == NULL)
1543 GetSystemInfo(&si);
1544 } else {
1545 _GetNativeSystemInfo(&si);
1546 }
1547 if (os_vers == 5002) {
1548 if (osvi.wProductType == VER_NT_WORKSTATION &&
1549 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1550 st->print(" Windows XP x64 Edition");
1551 else
1552 st->print(" Windows Server 2003 family");
1553 } else if (os_vers == 6000) {
1554 if (osvi.wProductType == VER_NT_WORKSTATION)
1555 st->print(" Windows Vista");
1556 else
1557 st->print(" Windows Server 2008");
1558 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1559 st->print(" , 64 bit");
1560 } else if (os_vers == 6001) {
1561 if (osvi.wProductType == VER_NT_WORKSTATION) {
1562 st->print(" Windows 7");
1563 } else {
1564 // Unrecognized windows, print out its major and minor versions
1565 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1566 }
1567 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1568 st->print(" , 64 bit");
1569 } else { // future os
1570 // Unrecognized windows, print out its major and minor versions
1571 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1572 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1573 st->print(" , 64 bit");
1574 }
1575 break;
1576 }
1577 default: // future windows, print out its major and minor versions
1578 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1579 }
1580 } else {
1581 switch (os_vers) {
1582 case 4000: st->print(" Windows 95"); break;
1583 case 4010: st->print(" Windows 98"); break;
1584 case 4090: st->print(" Windows Me"); break;
1585 default: // future windows, print out its major and minor versions
1586 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1587 }
1588 }
1589 st->print(" Build %d", osvi.dwBuildNumber);
1590 st->print(" %s", osvi.szCSDVersion); // service pack
1591 st->cr();
1592 }
1593
1594 void os::print_memory_info(outputStream* st) {
1595 st->print("Memory:");
1596 st->print(" %dk page", os::vm_page_size()>>10);
1597
1598 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1599 // value if total memory is larger than 4GB
1600 MEMORYSTATUSEX ms;
1601 ms.dwLength = sizeof(ms);
1602 GlobalMemoryStatusEx(&ms);
1603
1604 st->print(", physical %uk", os::physical_memory() >> 10);
1605 st->print("(%uk free)", os::available_memory() >> 10);
1606
1607 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1608 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1609 st->cr();
1610 }
1611
1612 void os::print_siginfo(outputStream *st, void *siginfo) {
1613 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1614 st->print("siginfo:");
1615 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1616
1617 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1618 er->NumberParameters >= 2) {
1619 switch (er->ExceptionInformation[0]) {
1620 case 0: st->print(", reading address"); break;
1621 case 1: st->print(", writing address"); break;
1622 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1623 er->ExceptionInformation[0]);
1624 }
1625 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1626 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1627 er->NumberParameters >= 2 && UseSharedSpaces) {
1628 FileMapInfo* mapinfo = FileMapInfo::current_info();
1629 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1630 st->print("\n\nError accessing class data sharing archive." \
1631 " Mapped file inaccessible during execution, " \
1632 " possible disk/network problem.");
1633 }
1634 } else {
1635 int num = er->NumberParameters;
1636 if (num > 0) {
1637 st->print(", ExceptionInformation=");
1638 for (int i = 0; i < num; i++) {
1639 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1640 }
1641 }
1642 }
1643 st->cr();
1644 }
1645
1646 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1647 // do nothing
1648 }
1649
1650 static char saved_jvm_path[MAX_PATH] = {0};
1651
1652 // Find the full path to the current module, jvm.dll or jvm_g.dll
1653 void os::jvm_path(char *buf, jint buflen) {
1654 // Error checking.
1655 if (buflen < MAX_PATH) {
1656 assert(false, "must use a large-enough buffer");
1657 buf[0] = '\0';
1658 return;
1659 }
1660 // Lazy resolve the path to current module.
1661 if (saved_jvm_path[0] != 0) {
1662 strcpy(buf, saved_jvm_path);
1663 return;
1664 }
1665
1666 GetModuleFileName(vm_lib_handle, buf, buflen);
1667 strcpy(saved_jvm_path, buf);
1668 }
1669
1670
1671 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1672 #ifndef _WIN64
1673 st->print("_");
1674 #endif
1675 }
1676
1677
1678 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1679 #ifndef _WIN64
1680 st->print("@%d", args_size * sizeof(int));
1681 #endif
1682 }
1683
1684 // sun.misc.Signal
1685 // NOTE that this is a workaround for an apparent kernel bug where if
1686 // a signal handler for SIGBREAK is installed then that signal handler
1687 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1688 // See bug 4416763.
1689 static void (*sigbreakHandler)(int) = NULL;
1690
1691 static void UserHandler(int sig, void *siginfo, void *context) {
1692 os::signal_notify(sig);
1693 // We need to reinstate the signal handler each time...
1694 os::signal(sig, (void*)UserHandler);
1695 }
1696
1697 void* os::user_handler() {
1698 return (void*) UserHandler;
1699 }
1700
1701 void* os::signal(int signal_number, void* handler) {
1702 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1703 void (*oldHandler)(int) = sigbreakHandler;
1704 sigbreakHandler = (void (*)(int)) handler;
1705 return (void*) oldHandler;
1706 } else {
1707 return (void*)::signal(signal_number, (void (*)(int))handler);
1708 }
1709 }
1710
1711 void os::signal_raise(int signal_number) {
1712 raise(signal_number);
1713 }
1714
1715 // The Win32 C runtime library maps all console control events other than ^C
1716 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1717 // logoff, and shutdown events. We therefore install our own console handler
1718 // that raises SIGTERM for the latter cases.
1719 //
1720 static BOOL WINAPI consoleHandler(DWORD event) {
1721 switch(event) {
1722 case CTRL_C_EVENT:
1723 if (is_error_reported()) {
1724 // Ctrl-C is pressed during error reporting, likely because the error
1725 // handler fails to abort. Let VM die immediately.
1726 os::die();
1727 }
1728
1729 os::signal_raise(SIGINT);
1730 return TRUE;
1731 break;
1732 case CTRL_BREAK_EVENT:
1733 if (sigbreakHandler != NULL) {
1734 (*sigbreakHandler)(SIGBREAK);
1735 }
1736 return TRUE;
1737 break;
1738 case CTRL_CLOSE_EVENT:
1739 case CTRL_LOGOFF_EVENT:
1740 case CTRL_SHUTDOWN_EVENT:
1741 os::signal_raise(SIGTERM);
1742 return TRUE;
1743 break;
1744 default:
1745 break;
1746 }
1747 return FALSE;
1748 }
1749
1750 /*
1751 * The following code is moved from os.cpp for making this
1752 * code platform specific, which it is by its very nature.
1753 */
1754
1755 // Return maximum OS signal used + 1 for internal use only
1756 // Used as exit signal for signal_thread
1757 int os::sigexitnum_pd(){
1758 return NSIG;
1759 }
1760
1761 // a counter for each possible signal value, including signal_thread exit signal
1762 static volatile jint pending_signals[NSIG+1] = { 0 };
1763 static HANDLE sig_sem;
1764
1765 void os::signal_init_pd() {
1766 // Initialize signal structures
1767 memset((void*)pending_signals, 0, sizeof(pending_signals));
1768
1769 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
1770
1771 // Programs embedding the VM do not want it to attempt to receive
1772 // events like CTRL_LOGOFF_EVENT, which are used to implement the
1773 // shutdown hooks mechanism introduced in 1.3. For example, when
1774 // the VM is run as part of a Windows NT service (i.e., a servlet
1775 // engine in a web server), the correct behavior is for any console
1776 // control handler to return FALSE, not TRUE, because the OS's
1777 // "final" handler for such events allows the process to continue if
1778 // it is a service (while terminating it if it is not a service).
1779 // To make this behavior uniform and the mechanism simpler, we
1780 // completely disable the VM's usage of these console events if -Xrs
1781 // (=ReduceSignalUsage) is specified. This means, for example, that
1782 // the CTRL-BREAK thread dump mechanism is also disabled in this
1783 // case. See bugs 4323062, 4345157, and related bugs.
1784
1785 if (!ReduceSignalUsage) {
1786 // Add a CTRL-C handler
1787 SetConsoleCtrlHandler(consoleHandler, TRUE);
1788 }
1789 }
1790
1791 void os::signal_notify(int signal_number) {
1792 BOOL ret;
1793
1794 Atomic::inc(&pending_signals[signal_number]);
1795 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1796 assert(ret != 0, "ReleaseSemaphore() failed");
1797 }
1798
1799 static int check_pending_signals(bool wait_for_signal) {
1800 DWORD ret;
1801 while (true) {
1802 for (int i = 0; i < NSIG + 1; i++) {
1803 jint n = pending_signals[i];
1804 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1805 return i;
1806 }
1807 }
1808 if (!wait_for_signal) {
1809 return -1;
1810 }
1811
1812 JavaThread *thread = JavaThread::current();
1813
1814 ThreadBlockInVM tbivm(thread);
1815
1816 bool threadIsSuspended;
1817 do {
1818 thread->set_suspend_equivalent();
1819 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1820 ret = ::WaitForSingleObject(sig_sem, INFINITE);
1821 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
1822
1823 // were we externally suspended while we were waiting?
1824 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1825 if (threadIsSuspended) {
1826 //
1827 // The semaphore has been incremented, but while we were waiting
1828 // another thread suspended us. We don't want to continue running
1829 // while suspended because that would surprise the thread that
1830 // suspended us.
1831 //
1832 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1833 assert(ret != 0, "ReleaseSemaphore() failed");
1834
1835 thread->java_suspend_self();
1836 }
1837 } while (threadIsSuspended);
1838 }
1839 }
1840
1841 int os::signal_lookup() {
1842 return check_pending_signals(false);
1843 }
1844
1845 int os::signal_wait() {
1846 return check_pending_signals(true);
1847 }
1848
1849 // Implicit OS exception handling
1850
1851 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
1852 JavaThread* thread = JavaThread::current();
1853 // Save pc in thread
1854 #ifdef _M_IA64
1855 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP);
1856 // Set pc to handler
1857 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
1858 #elif _M_AMD64
1859 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip);
1860 // Set pc to handler
1861 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
1862 #else
1863 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip);
1864 // Set pc to handler
1865 exceptionInfo->ContextRecord->Eip = (LONG)handler;
1866 #endif
1867
1868 // Continue the execution
1869 return EXCEPTION_CONTINUE_EXECUTION;
1870 }
1871
1872
1873 // Used for PostMortemDump
1874 extern "C" void safepoints();
1875 extern "C" void find(int x);
1876 extern "C" void events();
1877
1878 // According to Windows API documentation, an illegal instruction sequence should generate
1879 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
1880 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
1881 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
1882
1883 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
1884
1885 // From "Execution Protection in the Windows Operating System" draft 0.35
1886 // Once a system header becomes available, the "real" define should be
1887 // included or copied here.
1888 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
1889
1890 #define def_excpt(val) #val, val
1891
1892 struct siglabel {
1893 char *name;
1894 int number;
1895 };
1896
1897 struct siglabel exceptlabels[] = {
1898 def_excpt(EXCEPTION_ACCESS_VIOLATION),
1899 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
1900 def_excpt(EXCEPTION_BREAKPOINT),
1901 def_excpt(EXCEPTION_SINGLE_STEP),
1902 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
1903 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
1904 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
1905 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
1906 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
1907 def_excpt(EXCEPTION_FLT_OVERFLOW),
1908 def_excpt(EXCEPTION_FLT_STACK_CHECK),
1909 def_excpt(EXCEPTION_FLT_UNDERFLOW),
1910 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
1911 def_excpt(EXCEPTION_INT_OVERFLOW),
1912 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
1913 def_excpt(EXCEPTION_IN_PAGE_ERROR),
1914 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
1915 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
1916 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
1917 def_excpt(EXCEPTION_STACK_OVERFLOW),
1918 def_excpt(EXCEPTION_INVALID_DISPOSITION),
1919 def_excpt(EXCEPTION_GUARD_PAGE),
1920 def_excpt(EXCEPTION_INVALID_HANDLE),
1921 NULL, 0
1922 };
1923
1924 const char* os::exception_name(int exception_code, char *buf, size_t size) {
1925 for (int i = 0; exceptlabels[i].name != NULL; i++) {
1926 if (exceptlabels[i].number == exception_code) {
1927 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
1928 return buf;
1929 }
1930 }
1931
1932 return NULL;
1933 }
1934
1935 //-----------------------------------------------------------------------------
1936 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
1937 // handle exception caused by idiv; should only happen for -MinInt/-1
1938 // (division by zero is handled explicitly)
1939 #ifdef _M_IA64
1940 assert(0, "Fix Handle_IDiv_Exception");
1941 #elif _M_AMD64
1942 PCONTEXT ctx = exceptionInfo->ContextRecord;
1943 address pc = (address)ctx->Rip;
1944 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
1945 assert(pc[0] == 0xF7, "not an idiv opcode");
1946 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
1947 assert(ctx->Rax == min_jint, "unexpected idiv exception");
1948 // set correct result values and continue after idiv instruction
1949 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
1950 ctx->Rax = (DWORD)min_jint; // result
1951 ctx->Rdx = (DWORD)0; // remainder
1952 // Continue the execution
1953 #else
1954 PCONTEXT ctx = exceptionInfo->ContextRecord;
1955 address pc = (address)ctx->Eip;
1956 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
1957 assert(pc[0] == 0xF7, "not an idiv opcode");
1958 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
1959 assert(ctx->Eax == min_jint, "unexpected idiv exception");
1960 // set correct result values and continue after idiv instruction
1961 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
1962 ctx->Eax = (DWORD)min_jint; // result
1963 ctx->Edx = (DWORD)0; // remainder
1964 // Continue the execution
1965 #endif
1966 return EXCEPTION_CONTINUE_EXECUTION;
1967 }
1968
1969 #ifndef _WIN64
1970 //-----------------------------------------------------------------------------
1971 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
1972 // handle exception caused by native mothod modifying control word
1973 PCONTEXT ctx = exceptionInfo->ContextRecord;
1974 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
1975
1976 switch (exception_code) {
1977 case EXCEPTION_FLT_DENORMAL_OPERAND:
1978 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
1979 case EXCEPTION_FLT_INEXACT_RESULT:
1980 case EXCEPTION_FLT_INVALID_OPERATION:
1981 case EXCEPTION_FLT_OVERFLOW:
1982 case EXCEPTION_FLT_STACK_CHECK:
1983 case EXCEPTION_FLT_UNDERFLOW:
1984 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
1985 if (fp_control_word != ctx->FloatSave.ControlWord) {
1986 // Restore FPCW and mask out FLT exceptions
1987 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
1988 // Mask out pending FLT exceptions
1989 ctx->FloatSave.StatusWord &= 0xffffff00;
1990 return EXCEPTION_CONTINUE_EXECUTION;
1991 }
1992 }
1993 return EXCEPTION_CONTINUE_SEARCH;
1994 }
1995 #else //_WIN64
1996 /*
1997 On Windows, the mxcsr control bits are non-volatile across calls
1998 See also CR 6192333
1999 If EXCEPTION_FLT_* happened after some native method modified
2000 mxcsr - it is not a jvm fault.
2001 However should we decide to restore of mxcsr after a faulty
2002 native method we can uncomment following code
2003 jint MxCsr = INITIAL_MXCSR;
2004 // we can't use StubRoutines::addr_mxcsr_std()
2005 // because in Win64 mxcsr is not saved there
2006 if (MxCsr != ctx->MxCsr) {
2007 ctx->MxCsr = MxCsr;
2008 return EXCEPTION_CONTINUE_EXECUTION;
2009 }
2010
2011 */
2012 #endif //_WIN64
2013
2014
2015 // Fatal error reporting is single threaded so we can make this a
2016 // static and preallocated. If it's more than MAX_PATH silently ignore
2017 // it.
2018 static char saved_error_file[MAX_PATH] = {0};
2019
2020 void os::set_error_file(const char *logfile) {
2021 if (strlen(logfile) <= MAX_PATH) {
2022 strncpy(saved_error_file, logfile, MAX_PATH);
2023 }
2024 }
2025
2026 static inline void report_error(Thread* t, DWORD exception_code,
2027 address addr, void* siginfo, void* context) {
2028 VMError err(t, exception_code, addr, siginfo, context);
2029 err.report_and_die();
2030
2031 // If UseOsErrorReporting, this will return here and save the error file
2032 // somewhere where we can find it in the minidump.
2033 }
2034
2035 //-----------------------------------------------------------------------------
2036 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2037 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2038 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2039 #ifdef _M_IA64
2040 address pc = (address) exceptionInfo->ContextRecord->StIIP;
2041 #elif _M_AMD64
2042 address pc = (address) exceptionInfo->ContextRecord->Rip;
2043 #else
2044 address pc = (address) exceptionInfo->ContextRecord->Eip;
2045 #endif
2046 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2047
2048 #ifndef _WIN64
2049 // Execution protection violation - win32 running on AMD64 only
2050 // Handled first to avoid misdiagnosis as a "normal" access violation;
2051 // This is safe to do because we have a new/unique ExceptionInformation
2052 // code for this condition.
2053 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2054 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2055 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2056 address addr = (address) exceptionRecord->ExceptionInformation[1];
2057
2058 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2059 int page_size = os::vm_page_size();
2060
2061 // Make sure the pc and the faulting address are sane.
2062 //
2063 // If an instruction spans a page boundary, and the page containing
2064 // the beginning of the instruction is executable but the following
2065 // page is not, the pc and the faulting address might be slightly
2066 // different - we still want to unguard the 2nd page in this case.
2067 //
2068 // 15 bytes seems to be a (very) safe value for max instruction size.
2069 bool pc_is_near_addr =
2070 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2071 bool instr_spans_page_boundary =
2072 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2073 (intptr_t) page_size) > 0);
2074
2075 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2076 static volatile address last_addr =
2077 (address) os::non_memory_address_word();
2078
2079 // In conservative mode, don't unguard unless the address is in the VM
2080 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2081 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2082
2083 // Set memory to RWX and retry
2084 address page_start =
2085 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2086 bool res = os::protect_memory((char*) page_start, page_size,
2087 os::MEM_PROT_RWX);
2088
2089 if (PrintMiscellaneous && Verbose) {
2090 char buf[256];
2091 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2092 "at " INTPTR_FORMAT
2093 ", unguarding " INTPTR_FORMAT ": %s", addr,
2094 page_start, (res ? "success" : strerror(errno)));
2095 tty->print_raw_cr(buf);
2096 }
2097
2098 // Set last_addr so if we fault again at the same address, we don't
2099 // end up in an endless loop.
2100 //
2101 // There are two potential complications here. Two threads trapping
2102 // at the same address at the same time could cause one of the
2103 // threads to think it already unguarded, and abort the VM. Likely
2104 // very rare.
2105 //
2106 // The other race involves two threads alternately trapping at
2107 // different addresses and failing to unguard the page, resulting in
2108 // an endless loop. This condition is probably even more unlikely
2109 // than the first.
2110 //
2111 // Although both cases could be avoided by using locks or thread
2112 // local last_addr, these solutions are unnecessary complication:
2113 // this handler is a best-effort safety net, not a complete solution.
2114 // It is disabled by default and should only be used as a workaround
2115 // in case we missed any no-execute-unsafe VM code.
2116
2117 last_addr = addr;
2118
2119 return EXCEPTION_CONTINUE_EXECUTION;
2120 }
2121 }
2122
2123 // Last unguard failed or not unguarding
2124 tty->print_raw_cr("Execution protection violation");
2125 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2126 exceptionInfo->ContextRecord);
2127 return EXCEPTION_CONTINUE_SEARCH;
2128 }
2129 }
2130 #endif // _WIN64
2131
2132 // Check to see if we caught the safepoint code in the
2133 // process of write protecting the memory serialization page.
2134 // It write enables the page immediately after protecting it
2135 // so just return.
2136 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2137 JavaThread* thread = (JavaThread*) t;
2138 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2139 address addr = (address) exceptionRecord->ExceptionInformation[1];
2140 if ( os::is_memory_serialize_page(thread, addr) ) {
2141 // Block current thread until the memory serialize page permission restored.
2142 os::block_on_serialize_page_trap();
2143 return EXCEPTION_CONTINUE_EXECUTION;
2144 }
2145 }
2146
2147
2148 if (t != NULL && t->is_Java_thread()) {
2149 JavaThread* thread = (JavaThread*) t;
2150 bool in_java = thread->thread_state() == _thread_in_Java;
2151
2152 // Handle potential stack overflows up front.
2153 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2154 if (os::uses_stack_guard_pages()) {
2155 #ifdef _M_IA64
2156 //
2157 // If it's a legal stack address continue, Windows will map it in.
2158 //
2159 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2160 address addr = (address) exceptionRecord->ExceptionInformation[1];
2161 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() )
2162 return EXCEPTION_CONTINUE_EXECUTION;
2163
2164 // The register save area is the same size as the memory stack
2165 // and starts at the page just above the start of the memory stack.
2166 // If we get a fault in this area, we've run out of register
2167 // stack. If we are in java, try throwing a stack overflow exception.
2168 if (addr > thread->stack_base() &&
2169 addr <= (thread->stack_base()+thread->stack_size()) ) {
2170 char buf[256];
2171 jio_snprintf(buf, sizeof(buf),
2172 "Register stack overflow, addr:%p, stack_base:%p\n",
2173 addr, thread->stack_base() );
2174 tty->print_raw_cr(buf);
2175 // If not in java code, return and hope for the best.
2176 return in_java ? Handle_Exception(exceptionInfo,
2177 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2178 : EXCEPTION_CONTINUE_EXECUTION;
2179 }
2180 #endif
2181 if (thread->stack_yellow_zone_enabled()) {
2182 // Yellow zone violation. The o/s has unprotected the first yellow
2183 // zone page for us. Note: must call disable_stack_yellow_zone to
2184 // update the enabled status, even if the zone contains only one page.
2185 thread->disable_stack_yellow_zone();
2186 // If not in java code, return and hope for the best.
2187 return in_java ? Handle_Exception(exceptionInfo,
2188 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2189 : EXCEPTION_CONTINUE_EXECUTION;
2190 } else {
2191 // Fatal red zone violation.
2192 thread->disable_stack_red_zone();
2193 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2194 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2195 exceptionInfo->ContextRecord);
2196 return EXCEPTION_CONTINUE_SEARCH;
2197 }
2198 } else if (in_java) {
2199 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2200 // a one-time-only guard page, which it has released to us. The next
2201 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2202 return Handle_Exception(exceptionInfo,
2203 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2204 } else {
2205 // Can only return and hope for the best. Further stack growth will
2206 // result in an ACCESS_VIOLATION.
2207 return EXCEPTION_CONTINUE_EXECUTION;
2208 }
2209 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2210 // Either stack overflow or null pointer exception.
2211 if (in_java) {
2212 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2213 address addr = (address) exceptionRecord->ExceptionInformation[1];
2214 address stack_end = thread->stack_base() - thread->stack_size();
2215 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2216 // Stack overflow.
2217 assert(!os::uses_stack_guard_pages(),
2218 "should be caught by red zone code above.");
2219 return Handle_Exception(exceptionInfo,
2220 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2221 }
2222 //
2223 // Check for safepoint polling and implicit null
2224 // We only expect null pointers in the stubs (vtable)
2225 // the rest are checked explicitly now.
2226 //
2227 CodeBlob* cb = CodeCache::find_blob(pc);
2228 if (cb != NULL) {
2229 if (os::is_poll_address(addr)) {
2230 address stub = SharedRuntime::get_poll_stub(pc);
2231 return Handle_Exception(exceptionInfo, stub);
2232 }
2233 }
2234 {
2235 #ifdef _WIN64
2236 //
2237 // If it's a legal stack address map the entire region in
2238 //
2239 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2240 address addr = (address) exceptionRecord->ExceptionInformation[1];
2241 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2242 addr = (address)((uintptr_t)addr &
2243 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2244 os::commit_memory((char *)addr, thread->stack_base() - addr,
2245 false );
2246 return EXCEPTION_CONTINUE_EXECUTION;
2247 }
2248 else
2249 #endif
2250 {
2251 // Null pointer exception.
2252 #ifdef _M_IA64
2253 // We catch register stack overflows in compiled code by doing
2254 // an explicit compare and executing a st8(G0, G0) if the
2255 // BSP enters into our guard area. We test for the overflow
2256 // condition and fall into the normal null pointer exception
2257 // code if BSP hasn't overflowed.
2258 if ( in_java ) {
2259 if(thread->register_stack_overflow()) {
2260 assert((address)exceptionInfo->ContextRecord->IntS3 ==
2261 thread->register_stack_limit(),
2262 "GR7 doesn't contain register_stack_limit");
2263 // Disable the yellow zone which sets the state that
2264 // we've got a stack overflow problem.
2265 if (thread->stack_yellow_zone_enabled()) {
2266 thread->disable_stack_yellow_zone();
2267 }
2268 // Give us some room to process the exception
2269 thread->disable_register_stack_guard();
2270 // Update GR7 with the new limit so we can continue running
2271 // compiled code.
2272 exceptionInfo->ContextRecord->IntS3 =
2273 (ULONGLONG)thread->register_stack_limit();
2274 return Handle_Exception(exceptionInfo,
2275 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2276 } else {
2277 //
2278 // Check for implicit null
2279 // We only expect null pointers in the stubs (vtable)
2280 // the rest are checked explicitly now.
2281 //
2282 if (((uintptr_t)addr) < os::vm_page_size() ) {
2283 // an access to the first page of VM--assume it is a null pointer
2284 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2285 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2286 }
2287 }
2288 } // in_java
2289
2290 // IA64 doesn't use implicit null checking yet. So we shouldn't
2291 // get here.
2292 tty->print_raw_cr("Access violation, possible null pointer exception");
2293 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2294 exceptionInfo->ContextRecord);
2295 return EXCEPTION_CONTINUE_SEARCH;
2296 #else /* !IA64 */
2297
2298 // Windows 98 reports faulting addresses incorrectly
2299 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2300 !os::win32::is_nt()) {
2301 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2302 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2303 }
2304 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2305 exceptionInfo->ContextRecord);
2306 return EXCEPTION_CONTINUE_SEARCH;
2307 #endif
2308 }
2309 }
2310 }
2311
2312 #ifdef _WIN64
2313 // Special care for fast JNI field accessors.
2314 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2315 // in and the heap gets shrunk before the field access.
2316 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2317 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2318 if (addr != (address)-1) {
2319 return Handle_Exception(exceptionInfo, addr);
2320 }
2321 }
2322 #endif
2323
2324 #ifdef _WIN64
2325 // Windows will sometimes generate an access violation
2326 // when we call malloc. Since we use VectoredExceptions
2327 // on 64 bit platforms, we see this exception. We must
2328 // pass this exception on so Windows can recover.
2329 // We check to see if the pc of the fault is in NTDLL.DLL
2330 // if so, we pass control on to Windows for handling.
2331 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH;
2332 #endif
2333
2334 // Stack overflow or null pointer exception in native code.
2335 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2336 exceptionInfo->ContextRecord);
2337 return EXCEPTION_CONTINUE_SEARCH;
2338 }
2339
2340 if (in_java) {
2341 switch (exception_code) {
2342 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2343 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2344
2345 case EXCEPTION_INT_OVERFLOW:
2346 return Handle_IDiv_Exception(exceptionInfo);
2347
2348 } // switch
2349 }
2350 #ifndef _WIN64
2351 if ((thread->thread_state() == _thread_in_Java) ||
2352 (thread->thread_state() == _thread_in_native) )
2353 {
2354 LONG result=Handle_FLT_Exception(exceptionInfo);
2355 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2356 }
2357 #endif //_WIN64
2358 }
2359
2360 if (exception_code != EXCEPTION_BREAKPOINT) {
2361 #ifndef _WIN64
2362 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2363 exceptionInfo->ContextRecord);
2364 #else
2365 // Itanium Windows uses a VectoredExceptionHandler
2366 // Which means that C++ programatic exception handlers (try/except)
2367 // will get here. Continue the search for the right except block if
2368 // the exception code is not a fatal code.
2369 switch ( exception_code ) {
2370 case EXCEPTION_ACCESS_VIOLATION:
2371 case EXCEPTION_STACK_OVERFLOW:
2372 case EXCEPTION_ILLEGAL_INSTRUCTION:
2373 case EXCEPTION_ILLEGAL_INSTRUCTION_2:
2374 case EXCEPTION_INT_OVERFLOW:
2375 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2376 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2377 exceptionInfo->ContextRecord);
2378 }
2379 break;
2380 default:
2381 break;
2382 }
2383 #endif
2384 }
2385 return EXCEPTION_CONTINUE_SEARCH;
2386 }
2387
2388 #ifndef _WIN64
2389 // Special care for fast JNI accessors.
2390 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2391 // the heap gets shrunk before the field access.
2392 // Need to install our own structured exception handler since native code may
2393 // install its own.
2394 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2395 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2396 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2397 address pc = (address) exceptionInfo->ContextRecord->Eip;
2398 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2399 if (addr != (address)-1) {
2400 return Handle_Exception(exceptionInfo, addr);
2401 }
2402 }
2403 return EXCEPTION_CONTINUE_SEARCH;
2404 }
2405
2406 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2407 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2408 __try { \
2409 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2410 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2411 } \
2412 return 0; \
2413 }
2414
2415 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2416 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2417 DEFINE_FAST_GETFIELD(jchar, char, Char)
2418 DEFINE_FAST_GETFIELD(jshort, short, Short)
2419 DEFINE_FAST_GETFIELD(jint, int, Int)
2420 DEFINE_FAST_GETFIELD(jlong, long, Long)
2421 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2422 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2423
2424 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2425 switch (type) {
2426 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2427 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2428 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2429 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2430 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2431 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2432 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2433 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2434 default: ShouldNotReachHere();
2435 }
2436 return (address)-1;
2437 }
2438 #endif
2439
2440 // Virtual Memory
2441
2442 int os::vm_page_size() { return os::win32::vm_page_size(); }
2443 int os::vm_allocation_granularity() {
2444 return os::win32::vm_allocation_granularity();
2445 }
2446
2447 // Windows large page support is available on Windows 2003. In order to use
2448 // large page memory, the administrator must first assign additional privilege
2449 // to the user:
2450 // + select Control Panel -> Administrative Tools -> Local Security Policy
2451 // + select Local Policies -> User Rights Assignment
2452 // + double click "Lock pages in memory", add users and/or groups
2453 // + reboot
2454 // Note the above steps are needed for administrator as well, as administrators
2455 // by default do not have the privilege to lock pages in memory.
2456 //
2457 // Note about Windows 2003: although the API supports committing large page
2458 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2459 // scenario, I found through experiment it only uses large page if the entire
2460 // memory region is reserved and committed in a single VirtualAlloc() call.
2461 // This makes Windows large page support more or less like Solaris ISM, in
2462 // that the entire heap must be committed upfront. This probably will change
2463 // in the future, if so the code below needs to be revisited.
2464
2465 #ifndef MEM_LARGE_PAGES
2466 #define MEM_LARGE_PAGES 0x20000000
2467 #endif
2468
2469 // GetLargePageMinimum is only available on Windows 2003. The other functions
2470 // are available on NT but not on Windows 98/Me. We have to resolve them at
2471 // runtime.
2472 typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void);
2473 typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type)
2474 (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
2475 typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE);
2476 typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID);
2477
2478 static GetLargePageMinimum_func_type _GetLargePageMinimum;
2479 static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges;
2480 static OpenProcessToken_func_type _OpenProcessToken;
2481 static LookupPrivilegeValue_func_type _LookupPrivilegeValue;
2482
2483 static HINSTANCE _kernel32;
2484 static HINSTANCE _advapi32;
2485 static HANDLE _hProcess;
2486 static HANDLE _hToken;
2487
2488 static size_t _large_page_size = 0;
2489
2490 static bool resolve_functions_for_large_page_init() {
2491 _kernel32 = LoadLibrary("kernel32.dll");
2492 if (_kernel32 == NULL) return false;
2493
2494 _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type,
2495 GetProcAddress(_kernel32, "GetLargePageMinimum"));
2496 if (_GetLargePageMinimum == NULL) return false;
2497
2498 _advapi32 = LoadLibrary("advapi32.dll");
2499 if (_advapi32 == NULL) return false;
2500
2501 _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type,
2502 GetProcAddress(_advapi32, "AdjustTokenPrivileges"));
2503 _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type,
2504 GetProcAddress(_advapi32, "OpenProcessToken"));
2505 _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type,
2506 GetProcAddress(_advapi32, "LookupPrivilegeValueA"));
2507 return _AdjustTokenPrivileges != NULL &&
2508 _OpenProcessToken != NULL &&
2509 _LookupPrivilegeValue != NULL;
2510 }
2511
2512 static bool request_lock_memory_privilege() {
2513 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2514 os::current_process_id());
2515
2516 LUID luid;
2517 if (_hProcess != NULL &&
2518 _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2519 _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2520
2521 TOKEN_PRIVILEGES tp;
2522 tp.PrivilegeCount = 1;
2523 tp.Privileges[0].Luid = luid;
2524 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2525
2526 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2527 // privilege. Check GetLastError() too. See MSDN document.
2528 if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2529 (GetLastError() == ERROR_SUCCESS)) {
2530 return true;
2531 }
2532 }
2533
2534 return false;
2535 }
2536
2537 static void cleanup_after_large_page_init() {
2538 _GetLargePageMinimum = NULL;
2539 _AdjustTokenPrivileges = NULL;
2540 _OpenProcessToken = NULL;
2541 _LookupPrivilegeValue = NULL;
2542 if (_kernel32) FreeLibrary(_kernel32);
2543 _kernel32 = NULL;
2544 if (_advapi32) FreeLibrary(_advapi32);
2545 _advapi32 = NULL;
2546 if (_hProcess) CloseHandle(_hProcess);
2547 _hProcess = NULL;
2548 if (_hToken) CloseHandle(_hToken);
2549 _hToken = NULL;
2550 }
2551
2552 bool os::large_page_init() {
2553 if (!UseLargePages) return false;
2554
2555 // print a warning if any large page related flag is specified on command line
2556 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2557 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2558 bool success = false;
2559
2560 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2561 if (resolve_functions_for_large_page_init()) {
2562 if (request_lock_memory_privilege()) {
2563 size_t s = _GetLargePageMinimum();
2564 if (s) {
2565 #if defined(IA32) || defined(AMD64)
2566 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2567 WARN("JVM cannot use large pages bigger than 4mb.");
2568 } else {
2569 #endif
2570 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2571 _large_page_size = LargePageSizeInBytes;
2572 } else {
2573 _large_page_size = s;
2574 }
2575 success = true;
2576 #if defined(IA32) || defined(AMD64)
2577 }
2578 #endif
2579 } else {
2580 WARN("Large page is not supported by the processor.");
2581 }
2582 } else {
2583 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2584 }
2585 } else {
2586 WARN("Large page is not supported by the operating system.");
2587 }
2588 #undef WARN
2589
2590 const size_t default_page_size = (size_t) vm_page_size();
2591 if (success && _large_page_size > default_page_size) {
2592 _page_sizes[0] = _large_page_size;
2593 _page_sizes[1] = default_page_size;
2594 _page_sizes[2] = 0;
2595 }
2596
2597 cleanup_after_large_page_init();
2598 return success;
2599 }
2600
2601 // On win32, one cannot release just a part of reserved memory, it's an
2602 // all or nothing deal. When we split a reservation, we must break the
2603 // reservation into two reservations.
2604 void os::split_reserved_memory(char *base, size_t size, size_t split,
2605 bool realloc) {
2606 if (size > 0) {
2607 release_memory(base, size);
2608 if (realloc) {
2609 reserve_memory(split, base);
2610 }
2611 if (size != split) {
2612 reserve_memory(size - split, base + split);
2613 }
2614 }
2615 }
2616
2617 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
2618 assert((size_t)addr % os::vm_allocation_granularity() == 0,
2619 "reserve alignment");
2620 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
2621 char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
2622 assert(res == NULL || addr == NULL || addr == res,
2623 "Unexpected address from reserve.");
2624 return res;
2625 }
2626
2627 // Reserve memory at an arbitrary address, only if that area is
2628 // available (and not reserved for something else).
2629 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2630 // Windows os::reserve_memory() fails of the requested address range is
2631 // not avilable.
2632 return reserve_memory(bytes, requested_addr);
2633 }
2634
2635 size_t os::large_page_size() {
2636 return _large_page_size;
2637 }
2638
2639 bool os::can_commit_large_page_memory() {
2640 // Windows only uses large page memory when the entire region is reserved
2641 // and committed in a single VirtualAlloc() call. This may change in the
2642 // future, but with Windows 2003 it's not possible to commit on demand.
2643 return false;
2644 }
2645
2646 bool os::can_execute_large_page_memory() {
2647 return true;
2648 }
2649
2650 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
2651
2652 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
2653
2654 if (UseLargePagesIndividualAllocation) {
2655 if (TracePageSizes && Verbose) {
2656 tty->print_cr("Reserving large pages individually.");
2657 }
2658 char * p_buf;
2659 // first reserve enough address space in advance since we want to be
2660 // able to break a single contiguous virtual address range into multiple
2661 // large page commits but WS2003 does not allow reserving large page space
2662 // so we just use 4K pages for reserve, this gives us a legal contiguous
2663 // address space. then we will deallocate that reservation, and re alloc
2664 // using large pages
2665 const size_t size_of_reserve = bytes + _large_page_size;
2666 if (bytes > size_of_reserve) {
2667 // Overflowed.
2668 warning("Individually allocated large pages failed, "
2669 "use -XX:-UseLargePagesIndividualAllocation to turn off");
2670 return NULL;
2671 }
2672 p_buf = (char *) VirtualAlloc(addr,
2673 size_of_reserve, // size of Reserve
2674 MEM_RESERVE,
2675 PAGE_READWRITE);
2676 // If reservation failed, return NULL
2677 if (p_buf == NULL) return NULL;
2678
2679 release_memory(p_buf, bytes + _large_page_size);
2680 // round up to page boundary. If the size_of_reserve did not
2681 // overflow and the reservation did not fail, this align up
2682 // should not overflow.
2683 p_buf = (char *) align_size_up((size_t)p_buf, _large_page_size);
2684
2685 // now go through and allocate one page at a time until all bytes are
2686 // allocated
2687 size_t bytes_remaining = align_size_up(bytes, _large_page_size);
2688 // An overflow of align_size_up() would have been caught above
2689 // in the calculation of size_of_reserve.
2690 char * next_alloc_addr = p_buf;
2691
2692 #ifdef ASSERT
2693 // Variable for the failure injection
2694 long ran_num = os::random();
2695 size_t fail_after = ran_num % bytes;
2696 #endif
2697
2698 while (bytes_remaining) {
2699 size_t bytes_to_rq = MIN2(bytes_remaining, _large_page_size);
2700 // Note allocate and commit
2701 char * p_new;
2702
2703 #ifdef ASSERT
2704 bool inject_error = LargePagesIndividualAllocationInjectError &&
2705 (bytes_remaining <= fail_after);
2706 #else
2707 const bool inject_error = false;
2708 #endif
2709
2710 if (inject_error) {
2711 p_new = NULL;
2712 } else {
2713 p_new = (char *) VirtualAlloc(next_alloc_addr,
2714 bytes_to_rq,
2715 MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES,
2716 prot);
2717 }
2718
2719 if (p_new == NULL) {
2720 // Free any allocated pages
2721 if (next_alloc_addr > p_buf) {
2722 // Some memory was committed so release it.
2723 size_t bytes_to_release = bytes - bytes_remaining;
2724 release_memory(p_buf, bytes_to_release);
2725 }
2726 #ifdef ASSERT
2727 if (UseLargePagesIndividualAllocation &&
2728 LargePagesIndividualAllocationInjectError) {
2729 if (TracePageSizes && Verbose) {
2730 tty->print_cr("Reserving large pages individually failed.");
2731 }
2732 }
2733 #endif
2734 return NULL;
2735 }
2736 bytes_remaining -= bytes_to_rq;
2737 next_alloc_addr += bytes_to_rq;
2738 }
2739
2740 return p_buf;
2741
2742 } else {
2743 // normal policy just allocate it all at once
2744 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
2745 char * res = (char *)VirtualAlloc(NULL, bytes, flag, prot);
2746 return res;
2747 }
2748 }
2749
2750 bool os::release_memory_special(char* base, size_t bytes) {
2751 return release_memory(base, bytes);
2752 }
2753
2754 void os::print_statistics() {
2755 }
2756
2757 bool os::commit_memory(char* addr, size_t bytes, bool exec) {
2758 if (bytes == 0) {
2759 // Don't bother the OS with noops.
2760 return true;
2761 }
2762 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
2763 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
2764 // Don't attempt to print anything if the OS call fails. We're
2765 // probably low on resources, so the print itself may cause crashes.
2766 bool result = VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) != 0;
2767 if (result != NULL && exec) {
2768 DWORD oldprot;
2769 // Windows doc says to use VirtualProtect to get execute permissions
2770 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot) != 0;
2771 } else {
2772 return result;
2773 }
2774 }
2775
2776 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint,
2777 bool exec) {
2778 return commit_memory(addr, size, exec);
2779 }
2780
2781 bool os::uncommit_memory(char* addr, size_t bytes) {
2782 if (bytes == 0) {
2783 // Don't bother the OS with noops.
2784 return true;
2785 }
2786 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
2787 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
2788 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0;
2789 }
2790
2791 bool os::release_memory(char* addr, size_t bytes) {
2792 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
2793 }
2794
2795 // Set protections specified
2796 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2797 bool is_committed) {
2798 unsigned int p = 0;
2799 switch (prot) {
2800 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
2801 case MEM_PROT_READ: p = PAGE_READONLY; break;
2802 case MEM_PROT_RW: p = PAGE_READWRITE; break;
2803 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
2804 default:
2805 ShouldNotReachHere();
2806 }
2807
2808 DWORD old_status;
2809
2810 // Strange enough, but on Win32 one can change protection only for committed
2811 // memory, not a big deal anyway, as bytes less or equal than 64K
2812 if (!is_committed && !commit_memory(addr, bytes, prot == MEM_PROT_RWX)) {
2813 fatal("cannot commit protection page");
2814 }
2815 // One cannot use os::guard_memory() here, as on Win32 guard page
2816 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
2817 //
2818 // Pages in the region become guard pages. Any attempt to access a guard page
2819 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
2820 // the guard page status. Guard pages thus act as a one-time access alarm.
2821 return VirtualProtect(addr, bytes, p, &old_status) != 0;
2822 }
2823
2824 bool os::guard_memory(char* addr, size_t bytes) {
2825 DWORD old_status;
2826 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
2827 }
2828
2829 bool os::unguard_memory(char* addr, size_t bytes) {
2830 DWORD old_status;
2831 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
2832 }
2833
2834 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
2835 void os::free_memory(char *addr, size_t bytes) { }
2836 void os::numa_make_global(char *addr, size_t bytes) { }
2837 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
2838 bool os::numa_topology_changed() { return false; }
2839 size_t os::numa_get_groups_num() { return 1; }
2840 int os::numa_get_group_id() { return 0; }
2841 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2842 if (size > 0) {
2843 ids[0] = 0;
2844 return 1;
2845 }
2846 return 0;
2847 }
2848
2849 bool os::get_page_info(char *start, page_info* info) {
2850 return false;
2851 }
2852
2853 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2854 return end;
2855 }
2856
2857 char* os::non_memory_address_word() {
2858 // Must never look like an address returned by reserve_memory,
2859 // even in its subfields (as defined by the CPU immediate fields,
2860 // if the CPU splits constants across multiple instructions).
2861 return (char*)-1;
2862 }
2863
2864 #define MAX_ERROR_COUNT 100
2865 #define SYS_THREAD_ERROR 0xffffffffUL
2866
2867 void os::pd_start_thread(Thread* thread) {
2868 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
2869 // Returns previous suspend state:
2870 // 0: Thread was not suspended
2871 // 1: Thread is running now
2872 // >1: Thread is still suspended.
2873 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
2874 }
2875
2876 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2877 return ::read(fd, buf, nBytes);
2878 }
2879
2880 class HighResolutionInterval {
2881 // The default timer resolution seems to be 10 milliseconds.
2882 // (Where is this written down?)
2883 // If someone wants to sleep for only a fraction of the default,
2884 // then we set the timer resolution down to 1 millisecond for
2885 // the duration of their interval.
2886 // We carefully set the resolution back, since otherwise we
2887 // seem to incur an overhead (3%?) that we don't need.
2888 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
2889 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
2890 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
2891 // timeBeginPeriod() if the relative error exceeded some threshold.
2892 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
2893 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
2894 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
2895 // resolution timers running.
2896 private:
2897 jlong resolution;
2898 public:
2899 HighResolutionInterval(jlong ms) {
2900 resolution = ms % 10L;
2901 if (resolution != 0) {
2902 MMRESULT result = timeBeginPeriod(1L);
2903 }
2904 }
2905 ~HighResolutionInterval() {
2906 if (resolution != 0) {
2907 MMRESULT result = timeEndPeriod(1L);
2908 }
2909 resolution = 0L;
2910 }
2911 };
2912
2913 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
2914 jlong limit = (jlong) MAXDWORD;
2915
2916 while(ms > limit) {
2917 int res;
2918 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
2919 return res;
2920 ms -= limit;
2921 }
2922
2923 assert(thread == Thread::current(), "thread consistency check");
2924 OSThread* osthread = thread->osthread();
2925 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
2926 int result;
2927 if (interruptable) {
2928 assert(thread->is_Java_thread(), "must be java thread");
2929 JavaThread *jt = (JavaThread *) thread;
2930 ThreadBlockInVM tbivm(jt);
2931
2932 jt->set_suspend_equivalent();
2933 // cleared by handle_special_suspend_equivalent_condition() or
2934 // java_suspend_self() via check_and_wait_while_suspended()
2935
2936 HANDLE events[1];
2937 events[0] = osthread->interrupt_event();
2938 HighResolutionInterval *phri=NULL;
2939 if(!ForceTimeHighResolution)
2940 phri = new HighResolutionInterval( ms );
2941 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
2942 result = OS_TIMEOUT;
2943 } else {
2944 ResetEvent(osthread->interrupt_event());
2945 osthread->set_interrupted(false);
2946 result = OS_INTRPT;
2947 }
2948 delete phri; //if it is NULL, harmless
2949
2950 // were we externally suspended while we were waiting?
2951 jt->check_and_wait_while_suspended();
2952 } else {
2953 assert(!thread->is_Java_thread(), "must not be java thread");
2954 Sleep((long) ms);
2955 result = OS_TIMEOUT;
2956 }
2957 return result;
2958 }
2959
2960 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2961 void os::infinite_sleep() {
2962 while (true) { // sleep forever ...
2963 Sleep(100000); // ... 100 seconds at a time
2964 }
2965 }
2966
2967 typedef BOOL (WINAPI * STTSignature)(void) ;
2968
2969 os::YieldResult os::NakedYield() {
2970 // Use either SwitchToThread() or Sleep(0)
2971 // Consider passing back the return value from SwitchToThread().
2972 // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread.
2973 // In that case we revert to Sleep(0).
2974 static volatile STTSignature stt = (STTSignature) 1 ;
2975
2976 if (stt == ((STTSignature) 1)) {
2977 stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ;
2978 // It's OK if threads race during initialization as the operation above is idempotent.
2979 }
2980 if (stt != NULL) {
2981 return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
2982 } else {
2983 Sleep (0) ;
2984 }
2985 return os::YIELD_UNKNOWN ;
2986 }
2987
2988 void os::yield() { os::NakedYield(); }
2989
2990 void os::yield_all(int attempts) {
2991 // Yields to all threads, including threads with lower priorities
2992 Sleep(1);
2993 }
2994
2995 // Win32 only gives you access to seven real priorities at a time,
2996 // so we compress Java's ten down to seven. It would be better
2997 // if we dynamically adjusted relative priorities.
2998
2999 int os::java_to_os_priority[MaxPriority + 1] = {
3000 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3001 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3002 THREAD_PRIORITY_LOWEST, // 2
3003 THREAD_PRIORITY_BELOW_NORMAL, // 3
3004 THREAD_PRIORITY_BELOW_NORMAL, // 4
3005 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3006 THREAD_PRIORITY_NORMAL, // 6
3007 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3008 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3009 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3010 THREAD_PRIORITY_HIGHEST // 10 MaxPriority
3011 };
3012
3013 int prio_policy1[MaxPriority + 1] = {
3014 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3015 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3016 THREAD_PRIORITY_LOWEST, // 2
3017 THREAD_PRIORITY_BELOW_NORMAL, // 3
3018 THREAD_PRIORITY_BELOW_NORMAL, // 4
3019 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3020 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3021 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3022 THREAD_PRIORITY_HIGHEST, // 8
3023 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3024 THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority
3025 };
3026
3027 static int prio_init() {
3028 // If ThreadPriorityPolicy is 1, switch tables
3029 if (ThreadPriorityPolicy == 1) {
3030 int i;
3031 for (i = 0; i < MaxPriority + 1; i++) {
3032 os::java_to_os_priority[i] = prio_policy1[i];
3033 }
3034 }
3035 return 0;
3036 }
3037
3038 OSReturn os::set_native_priority(Thread* thread, int priority) {
3039 if (!UseThreadPriorities) return OS_OK;
3040 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3041 return ret ? OS_OK : OS_ERR;
3042 }
3043
3044 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3045 if ( !UseThreadPriorities ) {
3046 *priority_ptr = java_to_os_priority[NormPriority];
3047 return OS_OK;
3048 }
3049 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3050 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3051 assert(false, "GetThreadPriority failed");
3052 return OS_ERR;
3053 }
3054 *priority_ptr = os_prio;
3055 return OS_OK;
3056 }
3057
3058
3059 // Hint to the underlying OS that a task switch would not be good.
3060 // Void return because it's a hint and can fail.
3061 void os::hint_no_preempt() {}
3062
3063 void os::interrupt(Thread* thread) {
3064 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3065 "possibility of dangling Thread pointer");
3066
3067 OSThread* osthread = thread->osthread();
3068 osthread->set_interrupted(true);
3069 // More than one thread can get here with the same value of osthread,
3070 // resulting in multiple notifications. We do, however, want the store
3071 // to interrupted() to be visible to other threads before we post
3072 // the interrupt event.
3073 OrderAccess::release();
3074 SetEvent(osthread->interrupt_event());
3075 // For JSR166: unpark after setting status
3076 if (thread->is_Java_thread())
3077 ((JavaThread*)thread)->parker()->unpark();
3078
3079 ParkEvent * ev = thread->_ParkEvent ;
3080 if (ev != NULL) ev->unpark() ;
3081
3082 }
3083
3084
3085 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3086 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3087 "possibility of dangling Thread pointer");
3088
3089 OSThread* osthread = thread->osthread();
3090 bool interrupted;
3091 interrupted = osthread->interrupted();
3092 if (clear_interrupted == true) {
3093 osthread->set_interrupted(false);
3094 ResetEvent(osthread->interrupt_event());
3095 } // Otherwise leave the interrupted state alone
3096
3097 return interrupted;
3098 }
3099
3100 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3101 ExtendedPC os::get_thread_pc(Thread* thread) {
3102 CONTEXT context;
3103 context.ContextFlags = CONTEXT_CONTROL;
3104 HANDLE handle = thread->osthread()->thread_handle();
3105 #ifdef _M_IA64
3106 assert(0, "Fix get_thread_pc");
3107 return ExtendedPC(NULL);
3108 #else
3109 if (GetThreadContext(handle, &context)) {
3110 #ifdef _M_AMD64
3111 return ExtendedPC((address) context.Rip);
3112 #else
3113 return ExtendedPC((address) context.Eip);
3114 #endif
3115 } else {
3116 return ExtendedPC(NULL);
3117 }
3118 #endif
3119 }
3120
3121 // GetCurrentThreadId() returns DWORD
3122 intx os::current_thread_id() { return GetCurrentThreadId(); }
3123
3124 static int _initial_pid = 0;
3125
3126 int os::current_process_id()
3127 {
3128 return (_initial_pid ? _initial_pid : _getpid());
3129 }
3130
3131 int os::win32::_vm_page_size = 0;
3132 int os::win32::_vm_allocation_granularity = 0;
3133 int os::win32::_processor_type = 0;
3134 // Processor level is not available on non-NT systems, use vm_version instead
3135 int os::win32::_processor_level = 0;
3136 julong os::win32::_physical_memory = 0;
3137 size_t os::win32::_default_stack_size = 0;
3138
3139 intx os::win32::_os_thread_limit = 0;
3140 volatile intx os::win32::_os_thread_count = 0;
3141
3142 bool os::win32::_is_nt = false;
3143 bool os::win32::_is_windows_2003 = false;
3144
3145
3146 void os::win32::initialize_system_info() {
3147 SYSTEM_INFO si;
3148 GetSystemInfo(&si);
3149 _vm_page_size = si.dwPageSize;
3150 _vm_allocation_granularity = si.dwAllocationGranularity;
3151 _processor_type = si.dwProcessorType;
3152 _processor_level = si.wProcessorLevel;
3153 set_processor_count(si.dwNumberOfProcessors);
3154
3155 MEMORYSTATUSEX ms;
3156 ms.dwLength = sizeof(ms);
3157
3158 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3159 // dwMemoryLoad (% of memory in use)
3160 GlobalMemoryStatusEx(&ms);
3161 _physical_memory = ms.ullTotalPhys;
3162
3163 OSVERSIONINFO oi;
3164 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
3165 GetVersionEx(&oi);
3166 switch(oi.dwPlatformId) {
3167 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3168 case VER_PLATFORM_WIN32_NT:
3169 _is_nt = true;
3170 {
3171 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3172 if (os_vers == 5002) {
3173 _is_windows_2003 = true;
3174 }
3175 }
3176 break;
3177 default: fatal("Unknown platform");
3178 }
3179
3180 _default_stack_size = os::current_stack_size();
3181 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3182 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3183 "stack size not a multiple of page size");
3184
3185 initialize_performance_counter();
3186
3187 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3188 // known to deadlock the system, if the VM issues to thread operations with
3189 // a too high frequency, e.g., such as changing the priorities.
3190 // The 6000 seems to work well - no deadlocks has been notices on the test
3191 // programs that we have seen experience this problem.
3192 if (!os::win32::is_nt()) {
3193 StarvationMonitorInterval = 6000;
3194 }
3195 }
3196
3197
3198 void os::win32::setmode_streams() {
3199 _setmode(_fileno(stdin), _O_BINARY);
3200 _setmode(_fileno(stdout), _O_BINARY);
3201 _setmode(_fileno(stderr), _O_BINARY);
3202 }
3203
3204
3205 int os::message_box(const char* title, const char* message) {
3206 int result = MessageBox(NULL, message, title,
3207 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3208 return result == IDYES;
3209 }
3210
3211 int os::allocate_thread_local_storage() {
3212 return TlsAlloc();
3213 }
3214
3215
3216 void os::free_thread_local_storage(int index) {
3217 TlsFree(index);
3218 }
3219
3220
3221 void os::thread_local_storage_at_put(int index, void* value) {
3222 TlsSetValue(index, value);
3223 assert(thread_local_storage_at(index) == value, "Just checking");
3224 }
3225
3226
3227 void* os::thread_local_storage_at(int index) {
3228 return TlsGetValue(index);
3229 }
3230
3231
3232 #ifndef PRODUCT
3233 #ifndef _WIN64
3234 // Helpers to check whether NX protection is enabled
3235 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3236 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3237 pex->ExceptionRecord->NumberParameters > 0 &&
3238 pex->ExceptionRecord->ExceptionInformation[0] ==
3239 EXCEPTION_INFO_EXEC_VIOLATION) {
3240 return EXCEPTION_EXECUTE_HANDLER;
3241 }
3242 return EXCEPTION_CONTINUE_SEARCH;
3243 }
3244
3245 void nx_check_protection() {
3246 // If NX is enabled we'll get an exception calling into code on the stack
3247 char code[] = { (char)0xC3 }; // ret
3248 void *code_ptr = (void *)code;
3249 __try {
3250 __asm call code_ptr
3251 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3252 tty->print_raw_cr("NX protection detected.");
3253 }
3254 }
3255 #endif // _WIN64
3256 #endif // PRODUCT
3257
3258 // this is called _before_ the global arguments have been parsed
3259 void os::init(void) {
3260 _initial_pid = _getpid();
3261
3262 init_random(1234567);
3263
3264 win32::initialize_system_info();
3265 win32::setmode_streams();
3266 init_page_sizes((size_t) win32::vm_page_size());
3267
3268 // For better scalability on MP systems (must be called after initialize_system_info)
3269 #ifndef PRODUCT
3270 if (is_MP()) {
3271 NoYieldsInMicrolock = true;
3272 }
3273 #endif
3274 // This may be overridden later when argument processing is done.
3275 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3276 os::win32::is_windows_2003());
3277
3278 // Initialize main_process and main_thread
3279 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3280 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3281 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3282 fatal("DuplicateHandle failed\n");
3283 }
3284 main_thread_id = (int) GetCurrentThreadId();
3285 }
3286
3287 // To install functions for atexit processing
3288 extern "C" {
3289 static void perfMemory_exit_helper() {
3290 perfMemory_exit();
3291 }
3292 }
3293
3294
3295 // this is called _after_ the global arguments have been parsed
3296 jint os::init_2(void) {
3297 // Allocate a single page and mark it as readable for safepoint polling
3298 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3299 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3300
3301 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3302 guarantee( return_page != NULL, "Commit Failed for polling page");
3303
3304 os::set_polling_page( polling_page );
3305
3306 #ifndef PRODUCT
3307 if( Verbose && PrintMiscellaneous )
3308 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3309 #endif
3310
3311 if (!UseMembar) {
3312 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3313 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3314
3315 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3316 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3317
3318 os::set_memory_serialize_page( mem_serialize_page );
3319
3320 #ifndef PRODUCT
3321 if(Verbose && PrintMiscellaneous)
3322 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3323 #endif
3324 }
3325
3326 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init());
3327
3328 // Setup Windows Exceptions
3329
3330 // On Itanium systems, Structured Exception Handling does not
3331 // work since stack frames must be walkable by the OS. Since
3332 // much of our code is dynamically generated, and we do not have
3333 // proper unwind .xdata sections, the system simply exits
3334 // rather than delivering the exception. To work around
3335 // this we use VectorExceptions instead.
3336 #ifdef _WIN64
3337 if (UseVectoredExceptions) {
3338 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter);
3339 }
3340 #endif
3341
3342 // for debugging float code generation bugs
3343 if (ForceFloatExceptions) {
3344 #ifndef _WIN64
3345 static long fp_control_word = 0;
3346 __asm { fstcw fp_control_word }
3347 // see Intel PPro Manual, Vol. 2, p 7-16
3348 const long precision = 0x20;
3349 const long underflow = 0x10;
3350 const long overflow = 0x08;
3351 const long zero_div = 0x04;
3352 const long denorm = 0x02;
3353 const long invalid = 0x01;
3354 fp_control_word |= invalid;
3355 __asm { fldcw fp_control_word }
3356 #endif
3357 }
3358
3359 // Initialize HPI.
3360 jint hpi_result = hpi::initialize();
3361 if (hpi_result != JNI_OK) { return hpi_result; }
3362
3363 // If stack_commit_size is 0, windows will reserve the default size,
3364 // but only commit a small portion of it.
3365 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3366 size_t default_reserve_size = os::win32::default_stack_size();
3367 size_t actual_reserve_size = stack_commit_size;
3368 if (stack_commit_size < default_reserve_size) {
3369 // If stack_commit_size == 0, we want this too
3370 actual_reserve_size = default_reserve_size;
3371 }
3372
3373 JavaThread::set_stack_size_at_create(stack_commit_size);
3374
3375 // Calculate theoretical max. size of Threads to guard gainst artifical
3376 // out-of-memory situations, where all available address-space has been
3377 // reserved by thread stacks.
3378 assert(actual_reserve_size != 0, "Must have a stack");
3379
3380 // Calculate the thread limit when we should start doing Virtual Memory
3381 // banging. Currently when the threads will have used all but 200Mb of space.
3382 //
3383 // TODO: consider performing a similar calculation for commit size instead
3384 // as reserve size, since on a 64-bit platform we'll run into that more
3385 // often than running out of virtual memory space. We can use the
3386 // lower value of the two calculations as the os_thread_limit.
3387 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3388 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3389
3390 // at exit methods are called in the reverse order of their registration.
3391 // there is no limit to the number of functions registered. atexit does
3392 // not set errno.
3393
3394 if (PerfAllowAtExitRegistration) {
3395 // only register atexit functions if PerfAllowAtExitRegistration is set.
3396 // atexit functions can be delayed until process exit time, which
3397 // can be problematic for embedded VM situations. Embedded VMs should
3398 // call DestroyJavaVM() to assure that VM resources are released.
3399
3400 // note: perfMemory_exit_helper atexit function may be removed in
3401 // the future if the appropriate cleanup code can be added to the
3402 // VM_Exit VMOperation's doit method.
3403 if (atexit(perfMemory_exit_helper) != 0) {
3404 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3405 }
3406 }
3407
3408 // initialize PSAPI or ToolHelp for fatal error handler
3409 if (win32::is_nt()) _init_psapi();
3410 else _init_toolhelp();
3411
3412 #ifndef _WIN64
3413 // Print something if NX is enabled (win32 on AMD64)
3414 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
3415 #endif
3416
3417 // initialize thread priority policy
3418 prio_init();
3419
3420 if (UseNUMA && !ForceNUMA) {
3421 UseNUMA = false; // Currently unsupported.
3422 }
3423
3424 return JNI_OK;
3425 }
3426
3427
3428 // Mark the polling page as unreadable
3429 void os::make_polling_page_unreadable(void) {
3430 DWORD old_status;
3431 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
3432 fatal("Could not disable polling page");
3433 };
3434
3435 // Mark the polling page as readable
3436 void os::make_polling_page_readable(void) {
3437 DWORD old_status;
3438 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
3439 fatal("Could not enable polling page");
3440 };
3441
3442
3443 int os::stat(const char *path, struct stat *sbuf) {
3444 char pathbuf[MAX_PATH];
3445 if (strlen(path) > MAX_PATH - 1) {
3446 errno = ENAMETOOLONG;
3447 return -1;
3448 }
3449 hpi::native_path(strcpy(pathbuf, path));
3450 int ret = ::stat(pathbuf, sbuf);
3451 if (sbuf != NULL && UseUTCFileTimestamp) {
3452 // Fix for 6539723. st_mtime returned from stat() is dependent on
3453 // the system timezone and so can return different values for the
3454 // same file if/when daylight savings time changes. This adjustment
3455 // makes sure the same timestamp is returned regardless of the TZ.
3456 //
3457 // See:
3458 // http://msdn.microsoft.com/library/
3459 // default.asp?url=/library/en-us/sysinfo/base/
3460 // time_zone_information_str.asp
3461 // and
3462 // http://msdn.microsoft.com/library/default.asp?url=
3463 // /library/en-us/sysinfo/base/settimezoneinformation.asp
3464 //
3465 // NOTE: there is a insidious bug here: If the timezone is changed
3466 // after the call to stat() but before 'GetTimeZoneInformation()', then
3467 // the adjustment we do here will be wrong and we'll return the wrong
3468 // value (which will likely end up creating an invalid class data
3469 // archive). Absent a better API for this, or some time zone locking
3470 // mechanism, we'll have to live with this risk.
3471 TIME_ZONE_INFORMATION tz;
3472 DWORD tzid = GetTimeZoneInformation(&tz);
3473 int daylightBias =
3474 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
3475 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
3476 }
3477 return ret;
3478 }
3479
3480
3481 #define FT2INT64(ft) \
3482 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
3483
3484
3485 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3486 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3487 // of a thread.
3488 //
3489 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3490 // the fast estimate available on the platform.
3491
3492 // current_thread_cpu_time() is not optimized for Windows yet
3493 jlong os::current_thread_cpu_time() {
3494 // return user + sys since the cost is the same
3495 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
3496 }
3497
3498 jlong os::thread_cpu_time(Thread* thread) {
3499 // consistent with what current_thread_cpu_time() returns.
3500 return os::thread_cpu_time(thread, true /* user+sys */);
3501 }
3502
3503 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3504 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3505 }
3506
3507 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
3508 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
3509 // If this function changes, os::is_thread_cpu_time_supported() should too
3510 if (os::win32::is_nt()) {
3511 FILETIME CreationTime;
3512 FILETIME ExitTime;
3513 FILETIME KernelTime;
3514 FILETIME UserTime;
3515
3516 if ( GetThreadTimes(thread->osthread()->thread_handle(),
3517 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3518 return -1;
3519 else
3520 if (user_sys_cpu_time) {
3521 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
3522 } else {
3523 return FT2INT64(UserTime) * 100;
3524 }
3525 } else {
3526 return (jlong) timeGetTime() * 1000000;
3527 }
3528 }
3529
3530 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3531 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3532 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3533 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3534 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3535 }
3536
3537 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3538 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3539 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3540 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3541 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3542 }
3543
3544 bool os::is_thread_cpu_time_supported() {
3545 // see os::thread_cpu_time
3546 if (os::win32::is_nt()) {
3547 FILETIME CreationTime;
3548 FILETIME ExitTime;
3549 FILETIME KernelTime;
3550 FILETIME UserTime;
3551
3552 if ( GetThreadTimes(GetCurrentThread(),
3553 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3554 return false;
3555 else
3556 return true;
3557 } else {
3558 return false;
3559 }
3560 }
3561
3562 // Windows does't provide a loadavg primitive so this is stubbed out for now.
3563 // It does have primitives (PDH API) to get CPU usage and run queue length.
3564 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
3565 // If we wanted to implement loadavg on Windows, we have a few options:
3566 //
3567 // a) Query CPU usage and run queue length and "fake" an answer by
3568 // returning the CPU usage if it's under 100%, and the run queue
3569 // length otherwise. It turns out that querying is pretty slow
3570 // on Windows, on the order of 200 microseconds on a fast machine.
3571 // Note that on the Windows the CPU usage value is the % usage
3572 // since the last time the API was called (and the first call
3573 // returns 100%), so we'd have to deal with that as well.
3574 //
3575 // b) Sample the "fake" answer using a sampling thread and store
3576 // the answer in a global variable. The call to loadavg would
3577 // just return the value of the global, avoiding the slow query.
3578 //
3579 // c) Sample a better answer using exponential decay to smooth the
3580 // value. This is basically the algorithm used by UNIX kernels.
3581 //
3582 // Note that sampling thread starvation could affect both (b) and (c).
3583 int os::loadavg(double loadavg[], int nelem) {
3584 return -1;
3585 }
3586
3587
3588 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
3589 bool os::dont_yield() {
3590 return DontYieldALot;
3591 }
3592
3593 // Is a (classpath) directory empty?
3594 bool os::dir_is_empty(const char* path) {
3595 WIN32_FIND_DATA fd;
3596 HANDLE f = FindFirstFile(path, &fd);
3597 if (f == INVALID_HANDLE_VALUE) {
3598 return true;
3599 }
3600 FindClose(f);
3601 return false;
3602 }
3603
3604 // create binary file, rewriting existing file if required
3605 int os::create_binary_file(const char* path, bool rewrite_existing) {
3606 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
3607 if (!rewrite_existing) {
3608 oflags |= _O_EXCL;
3609 }
3610 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
3611 }
3612
3613 // return current position of file pointer
3614 jlong os::current_file_offset(int fd) {
3615 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
3616 }
3617
3618 // move file pointer to the specified offset
3619 jlong os::seek_to_file_offset(int fd, jlong offset) {
3620 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
3621 }
3622
3623
3624 // Map a block of memory.
3625 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
3626 char *addr, size_t bytes, bool read_only,
3627 bool allow_exec) {
3628 HANDLE hFile;
3629 char* base;
3630
3631 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
3632 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
3633 if (hFile == NULL) {
3634 if (PrintMiscellaneous && Verbose) {
3635 DWORD err = GetLastError();
3636 tty->print_cr("CreateFile() failed: GetLastError->%ld.");
3637 }
3638 return NULL;
3639 }
3640
3641 if (allow_exec) {
3642 // CreateFileMapping/MapViewOfFileEx can't map executable memory
3643 // unless it comes from a PE image (which the shared archive is not.)
3644 // Even VirtualProtect refuses to give execute access to mapped memory
3645 // that was not previously executable.
3646 //
3647 // Instead, stick the executable region in anonymous memory. Yuck.
3648 // Penalty is that ~4 pages will not be shareable - in the future
3649 // we might consider DLLizing the shared archive with a proper PE
3650 // header so that mapping executable + sharing is possible.
3651
3652 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
3653 PAGE_READWRITE);
3654 if (base == NULL) {
3655 if (PrintMiscellaneous && Verbose) {
3656 DWORD err = GetLastError();
3657 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
3658 }
3659 CloseHandle(hFile);
3660 return NULL;
3661 }
3662
3663 DWORD bytes_read;
3664 OVERLAPPED overlapped;
3665 overlapped.Offset = (DWORD)file_offset;
3666 overlapped.OffsetHigh = 0;
3667 overlapped.hEvent = NULL;
3668 // ReadFile guarantees that if the return value is true, the requested
3669 // number of bytes were read before returning.
3670 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
3671 if (!res) {
3672 if (PrintMiscellaneous && Verbose) {
3673 DWORD err = GetLastError();
3674 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
3675 }
3676 release_memory(base, bytes);
3677 CloseHandle(hFile);
3678 return NULL;
3679 }
3680 } else {
3681 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
3682 NULL /*file_name*/);
3683 if (hMap == NULL) {
3684 if (PrintMiscellaneous && Verbose) {
3685 DWORD err = GetLastError();
3686 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.");
3687 }
3688 CloseHandle(hFile);
3689 return NULL;
3690 }
3691
3692 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
3693 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
3694 (DWORD)bytes, addr);
3695 if (base == NULL) {
3696 if (PrintMiscellaneous && Verbose) {
3697 DWORD err = GetLastError();
3698 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
3699 }
3700 CloseHandle(hMap);
3701 CloseHandle(hFile);
3702 return NULL;
3703 }
3704
3705 if (CloseHandle(hMap) == 0) {
3706 if (PrintMiscellaneous && Verbose) {
3707 DWORD err = GetLastError();
3708 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
3709 }
3710 CloseHandle(hFile);
3711 return base;
3712 }
3713 }
3714
3715 if (allow_exec) {
3716 DWORD old_protect;
3717 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
3718 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
3719
3720 if (!res) {
3721 if (PrintMiscellaneous && Verbose) {
3722 DWORD err = GetLastError();
3723 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
3724 }
3725 // Don't consider this a hard error, on IA32 even if the
3726 // VirtualProtect fails, we should still be able to execute
3727 CloseHandle(hFile);
3728 return base;
3729 }
3730 }
3731
3732 if (CloseHandle(hFile) == 0) {
3733 if (PrintMiscellaneous && Verbose) {
3734 DWORD err = GetLastError();
3735 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
3736 }
3737 return base;
3738 }
3739
3740 return base;
3741 }
3742
3743
3744 // Remap a block of memory.
3745 char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
3746 char *addr, size_t bytes, bool read_only,
3747 bool allow_exec) {
3748 // This OS does not allow existing memory maps to be remapped so we
3749 // have to unmap the memory before we remap it.
3750 if (!os::unmap_memory(addr, bytes)) {
3751 return NULL;
3752 }
3753
3754 // There is a very small theoretical window between the unmap_memory()
3755 // call above and the map_memory() call below where a thread in native
3756 // code may be able to access an address that is no longer mapped.
3757
3758 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3759 allow_exec);
3760 }
3761
3762
3763 // Unmap a block of memory.
3764 // Returns true=success, otherwise false.
3765
3766 bool os::unmap_memory(char* addr, size_t bytes) {
3767 BOOL result = UnmapViewOfFile(addr);
3768 if (result == 0) {
3769 if (PrintMiscellaneous && Verbose) {
3770 DWORD err = GetLastError();
3771 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
3772 }
3773 return false;
3774 }
3775 return true;
3776 }
3777
3778 void os::pause() {
3779 char filename[MAX_PATH];
3780 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3781 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
3782 } else {
3783 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3784 }
3785
3786 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3787 if (fd != -1) {
3788 struct stat buf;
3789 close(fd);
3790 while (::stat(filename, &buf) == 0) {
3791 Sleep(100);
3792 }
3793 } else {
3794 jio_fprintf(stderr,
3795 "Could not open pause file '%s', continuing immediately.\n", filename);
3796 }
3797 }
3798
3799 // An Event wraps a win32 "CreateEvent" kernel handle.
3800 //
3801 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
3802 //
3803 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
3804 // field, and call CloseHandle() on the win32 event handle. Unpark() would
3805 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
3806 // In addition, an unpark() operation might fetch the handle field, but the
3807 // event could recycle between the fetch and the SetEvent() operation.
3808 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
3809 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
3810 // on an stale but recycled handle would be harmless, but in practice this might
3811 // confuse other non-Sun code, so it's not a viable approach.
3812 //
3813 // 2: Once a win32 event handle is associated with an Event, it remains associated
3814 // with the Event. The event handle is never closed. This could be construed
3815 // as handle leakage, but only up to the maximum # of threads that have been extant
3816 // at any one time. This shouldn't be an issue, as windows platforms typically
3817 // permit a process to have hundreds of thousands of open handles.
3818 //
3819 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
3820 // and release unused handles.
3821 //
3822 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
3823 // It's not clear, however, that we wouldn't be trading one type of leak for another.
3824 //
3825 // 5. Use an RCU-like mechanism (Read-Copy Update).
3826 // Or perhaps something similar to Maged Michael's "Hazard pointers".
3827 //
3828 // We use (2).
3829 //
3830 // TODO-FIXME:
3831 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
3832 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
3833 // to recover from (or at least detect) the dreaded Windows 841176 bug.
3834 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
3835 // into a single win32 CreateEvent() handle.
3836 //
3837 // _Event transitions in park()
3838 // -1 => -1 : illegal
3839 // 1 => 0 : pass - return immediately
3840 // 0 => -1 : block
3841 //
3842 // _Event serves as a restricted-range semaphore :
3843 // -1 : thread is blocked
3844 // 0 : neutral - thread is running or ready
3845 // 1 : signaled - thread is running or ready
3846 //
3847 // Another possible encoding of _Event would be
3848 // with explicit "PARKED" and "SIGNALED" bits.
3849
3850 int os::PlatformEvent::park (jlong Millis) {
3851 guarantee (_ParkHandle != NULL , "Invariant") ;
3852 guarantee (Millis > 0 , "Invariant") ;
3853 int v ;
3854
3855 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
3856 // the initial park() operation.
3857
3858 for (;;) {
3859 v = _Event ;
3860 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
3861 }
3862 guarantee ((v == 0) || (v == 1), "invariant") ;
3863 if (v != 0) return OS_OK ;
3864
3865 // Do this the hard way by blocking ...
3866 // TODO: consider a brief spin here, gated on the success of recent
3867 // spin attempts by this thread.
3868 //
3869 // We decompose long timeouts into series of shorter timed waits.
3870 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
3871 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
3872 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
3873 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
3874 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
3875 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
3876 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
3877 // for the already waited time. This policy does not admit any new outcomes.
3878 // In the future, however, we might want to track the accumulated wait time and
3879 // adjust Millis accordingly if we encounter a spurious wakeup.
3880
3881 const int MAXTIMEOUT = 0x10000000 ;
3882 DWORD rv = WAIT_TIMEOUT ;
3883 while (_Event < 0 && Millis > 0) {
3884 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
3885 if (Millis > MAXTIMEOUT) {
3886 prd = MAXTIMEOUT ;
3887 }
3888 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
3889 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
3890 if (rv == WAIT_TIMEOUT) {
3891 Millis -= prd ;
3892 }
3893 }
3894 v = _Event ;
3895 _Event = 0 ;
3896 OrderAccess::fence() ;
3897 // If we encounter a nearly simultanous timeout expiry and unpark()
3898 // we return OS_OK indicating we awoke via unpark().
3899 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
3900 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
3901 }
3902
3903 void os::PlatformEvent::park () {
3904 guarantee (_ParkHandle != NULL, "Invariant") ;
3905 // Invariant: Only the thread associated with the Event/PlatformEvent
3906 // may call park().
3907 int v ;
3908 for (;;) {
3909 v = _Event ;
3910 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
3911 }
3912 guarantee ((v == 0) || (v == 1), "invariant") ;
3913 if (v != 0) return ;
3914
3915 // Do this the hard way by blocking ...
3916 // TODO: consider a brief spin here, gated on the success of recent
3917 // spin attempts by this thread.
3918 while (_Event < 0) {
3919 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
3920 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
3921 }
3922
3923 // Usually we'll find _Event == 0 at this point, but as
3924 // an optional optimization we clear it, just in case can
3925 // multiple unpark() operations drove _Event up to 1.
3926 _Event = 0 ;
3927 OrderAccess::fence() ;
3928 guarantee (_Event >= 0, "invariant") ;
3929 }
3930
3931 void os::PlatformEvent::unpark() {
3932 guarantee (_ParkHandle != NULL, "Invariant") ;
3933 int v ;
3934 for (;;) {
3935 v = _Event ; // Increment _Event if it's < 1.
3936 if (v > 0) {
3937 // If it's already signaled just return.
3938 // The LD of _Event could have reordered or be satisfied
3939 // by a read-aside from this processor's write buffer.
3940 // To avoid problems execute a barrier and then
3941 // ratify the value. A degenerate CAS() would also work.
3942 // Viz., CAS (v+0, &_Event, v) == v).
3943 OrderAccess::fence() ;
3944 if (_Event == v) return ;
3945 continue ;
3946 }
3947 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
3948 }
3949 if (v < 0) {
3950 ::SetEvent (_ParkHandle) ;
3951 }
3952 }
3953
3954
3955 // JSR166
3956 // -------------------------------------------------------
3957
3958 /*
3959 * The Windows implementation of Park is very straightforward: Basic
3960 * operations on Win32 Events turn out to have the right semantics to
3961 * use them directly. We opportunistically resuse the event inherited
3962 * from Monitor.
3963 */
3964
3965
3966 void Parker::park(bool isAbsolute, jlong time) {
3967 guarantee (_ParkEvent != NULL, "invariant") ;
3968 // First, demultiplex/decode time arguments
3969 if (time < 0) { // don't wait
3970 return;
3971 }
3972 else if (time == 0) {
3973 time = INFINITE;
3974 }
3975 else if (isAbsolute) {
3976 time -= os::javaTimeMillis(); // convert to relative time
3977 if (time <= 0) // already elapsed
3978 return;
3979 }
3980 else { // relative
3981 time /= 1000000; // Must coarsen from nanos to millis
3982 if (time == 0) // Wait for the minimal time unit if zero
3983 time = 1;
3984 }
3985
3986 JavaThread* thread = (JavaThread*)(Thread::current());
3987 assert(thread->is_Java_thread(), "Must be JavaThread");
3988 JavaThread *jt = (JavaThread *)thread;
3989
3990 // Don't wait if interrupted or already triggered
3991 if (Thread::is_interrupted(thread, false) ||
3992 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
3993 ResetEvent(_ParkEvent);
3994 return;
3995 }
3996 else {
3997 ThreadBlockInVM tbivm(jt);
3998 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3999 jt->set_suspend_equivalent();
4000
4001 WaitForSingleObject(_ParkEvent, time);
4002 ResetEvent(_ParkEvent);
4003
4004 // If externally suspended while waiting, re-suspend
4005 if (jt->handle_special_suspend_equivalent_condition()) {
4006 jt->java_suspend_self();
4007 }
4008 }
4009 }
4010
4011 void Parker::unpark() {
4012 guarantee (_ParkEvent != NULL, "invariant") ;
4013 SetEvent(_ParkEvent);
4014 }
4015
4016 // Run the specified command in a separate process. Return its exit value,
4017 // or -1 on failure (e.g. can't create a new process).
4018 int os::fork_and_exec(char* cmd) {
4019 STARTUPINFO si;
4020 PROCESS_INFORMATION pi;
4021
4022 memset(&si, 0, sizeof(si));
4023 si.cb = sizeof(si);
4024 memset(&pi, 0, sizeof(pi));
4025 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4026 cmd, // command line
4027 NULL, // process security attribute
4028 NULL, // thread security attribute
4029 TRUE, // inherits system handles
4030 0, // no creation flags
4031 NULL, // use parent's environment block
4032 NULL, // use parent's starting directory
4033 &si, // (in) startup information
4034 &pi); // (out) process information
4035
4036 if (rslt) {
4037 // Wait until child process exits.
4038 WaitForSingleObject(pi.hProcess, INFINITE);
4039
4040 DWORD exit_code;
4041 GetExitCodeProcess(pi.hProcess, &exit_code);
4042
4043 // Close process and thread handles.
4044 CloseHandle(pi.hProcess);
4045 CloseHandle(pi.hThread);
4046
4047 return (int)exit_code;
4048 } else {
4049 return -1;
4050 }
4051 }
4052
4053 //--------------------------------------------------------------------------------------------------
4054 // Non-product code
4055
4056 static int mallocDebugIntervalCounter = 0;
4057 static int mallocDebugCounter = 0;
4058 bool os::check_heap(bool force) {
4059 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
4060 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
4061 // Note: HeapValidate executes two hardware breakpoints when it finds something
4062 // wrong; at these points, eax contains the address of the offending block (I think).
4063 // To get to the exlicit error message(s) below, just continue twice.
4064 HANDLE heap = GetProcessHeap();
4065 { HeapLock(heap);
4066 PROCESS_HEAP_ENTRY phe;
4067 phe.lpData = NULL;
4068 while (HeapWalk(heap, &phe) != 0) {
4069 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
4070 !HeapValidate(heap, 0, phe.lpData)) {
4071 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
4072 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
4073 fatal("corrupted C heap");
4074 }
4075 }
4076 int err = GetLastError();
4077 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
4078 fatal1("heap walk aborted with error %d", err);
4079 }
4080 HeapUnlock(heap);
4081 }
4082 mallocDebugIntervalCounter = 0;
4083 }
4084 return true;
4085 }
4086
4087
4088 #ifndef PRODUCT
4089 bool os::find(address addr) {
4090 // Nothing yet
4091 return false;
4092 }
4093 #endif
4094
4095 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
4096 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
4097
4098 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
4099 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
4100 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
4101 address addr = (address) exceptionRecord->ExceptionInformation[1];
4102
4103 if (os::is_memory_serialize_page(thread, addr))
4104 return EXCEPTION_CONTINUE_EXECUTION;
4105 }
4106
4107 return EXCEPTION_CONTINUE_SEARCH;
4108 }
4109
4110 static int getLastErrorString(char *buf, size_t len)
4111 {
4112 long errval;
4113
4114 if ((errval = GetLastError()) != 0)
4115 {
4116 /* DOS error */
4117 size_t n = (size_t)FormatMessage(
4118 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
4119 NULL,
4120 errval,
4121 0,
4122 buf,
4123 (DWORD)len,
4124 NULL);
4125 if (n > 3) {
4126 /* Drop final '.', CR, LF */
4127 if (buf[n - 1] == '\n') n--;
4128 if (buf[n - 1] == '\r') n--;
4129 if (buf[n - 1] == '.') n--;
4130 buf[n] = '\0';
4131 }
4132 return (int)n;
4133 }
4134
4135 if (errno != 0)
4136 {
4137 /* C runtime error that has no corresponding DOS error code */
4138 const char *s = strerror(errno);
4139 size_t n = strlen(s);
4140 if (n >= len) n = len - 1;
4141 strncpy(buf, s, n);
4142 buf[n] = '\0';
4143 return (int)n;
4144 }
4145 return 0;
4146 }