Thu, 04 Dec 2008 17:29:56 -0800
6739363: Xcheck jni doesn't check native function arguments
Summary: Fix adds support for verifying arguments with -Xcheck:jni.
Reviewed-by: coleenp
1 /*
2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 #ifdef _WIN64
26 // Must be at least Windows 2000 or XP to use VectoredExceptions
27 #define _WIN32_WINNT 0x500
28 #endif
30 // do not include precompiled header file
31 # include "incls/_os_windows.cpp.incl"
33 #ifdef _DEBUG
34 #include <crtdbg.h>
35 #endif
38 #include <windows.h>
39 #include <sys/types.h>
40 #include <sys/stat.h>
41 #include <sys/timeb.h>
42 #include <objidl.h>
43 #include <shlobj.h>
45 #include <malloc.h>
46 #include <signal.h>
47 #include <direct.h>
48 #include <errno.h>
49 #include <fcntl.h>
50 #include <io.h>
51 #include <process.h> // For _beginthreadex(), _endthreadex()
52 #include <imagehlp.h> // For os::dll_address_to_function_name
54 /* for enumerating dll libraries */
55 #include <tlhelp32.h>
56 #include <vdmdbg.h>
58 // for timer info max values which include all bits
59 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
61 // For DLL loading/load error detection
62 // Values of PE COFF
63 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
64 #define IMAGE_FILE_SIGNATURE_LENGTH 4
66 static HANDLE main_process;
67 static HANDLE main_thread;
68 static int main_thread_id;
70 static FILETIME process_creation_time;
71 static FILETIME process_exit_time;
72 static FILETIME process_user_time;
73 static FILETIME process_kernel_time;
75 #ifdef _WIN64
76 PVOID topLevelVectoredExceptionHandler = NULL;
77 #endif
79 #ifdef _M_IA64
80 #define __CPU__ ia64
81 #elif _M_AMD64
82 #define __CPU__ amd64
83 #else
84 #define __CPU__ i486
85 #endif
87 // save DLL module handle, used by GetModuleFileName
89 HINSTANCE vm_lib_handle;
90 static int getLastErrorString(char *buf, size_t len);
92 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
93 switch (reason) {
94 case DLL_PROCESS_ATTACH:
95 vm_lib_handle = hinst;
96 if(ForceTimeHighResolution)
97 timeBeginPeriod(1L);
98 break;
99 case DLL_PROCESS_DETACH:
100 if(ForceTimeHighResolution)
101 timeEndPeriod(1L);
102 #ifdef _WIN64
103 if (topLevelVectoredExceptionHandler != NULL) {
104 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler);
105 topLevelVectoredExceptionHandler = NULL;
106 }
107 #endif
108 break;
109 default:
110 break;
111 }
112 return true;
113 }
115 static inline double fileTimeAsDouble(FILETIME* time) {
116 const double high = (double) ((unsigned int) ~0);
117 const double split = 10000000.0;
118 double result = (time->dwLowDateTime / split) +
119 time->dwHighDateTime * (high/split);
120 return result;
121 }
123 // Implementation of os
125 bool os::getenv(const char* name, char* buffer, int len) {
126 int result = GetEnvironmentVariable(name, buffer, len);
127 return result > 0 && result < len;
128 }
131 // No setuid programs under Windows.
132 bool os::have_special_privileges() {
133 return false;
134 }
137 // This method is a periodic task to check for misbehaving JNI applications
138 // under CheckJNI, we can add any periodic checks here.
139 // For Windows at the moment does nothing
140 void os::run_periodic_checks() {
141 return;
142 }
144 #ifndef _WIN64
145 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
146 #endif
147 void os::init_system_properties_values() {
148 /* sysclasspath, java_home, dll_dir */
149 {
150 char *home_path;
151 char *dll_path;
152 char *pslash;
153 char *bin = "\\bin";
154 char home_dir[MAX_PATH];
156 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
157 os::jvm_path(home_dir, sizeof(home_dir));
158 // Found the full path to jvm[_g].dll.
159 // Now cut the path to <java_home>/jre if we can.
160 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
161 pslash = strrchr(home_dir, '\\');
162 if (pslash != NULL) {
163 *pslash = '\0'; /* get rid of \{client|server} */
164 pslash = strrchr(home_dir, '\\');
165 if (pslash != NULL)
166 *pslash = '\0'; /* get rid of \bin */
167 }
168 }
170 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1);
171 if (home_path == NULL)
172 return;
173 strcpy(home_path, home_dir);
174 Arguments::set_java_home(home_path);
176 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1);
177 if (dll_path == NULL)
178 return;
179 strcpy(dll_path, home_dir);
180 strcat(dll_path, bin);
181 Arguments::set_dll_dir(dll_path);
183 if (!set_boot_path('\\', ';'))
184 return;
185 }
187 /* library_path */
188 #define EXT_DIR "\\lib\\ext"
189 #define BIN_DIR "\\bin"
190 #define PACKAGE_DIR "\\Sun\\Java"
191 {
192 /* Win32 library search order (See the documentation for LoadLibrary):
193 *
194 * 1. The directory from which application is loaded.
195 * 2. The current directory
196 * 3. The system wide Java Extensions directory (Java only)
197 * 4. System directory (GetSystemDirectory)
198 * 5. Windows directory (GetWindowsDirectory)
199 * 6. The PATH environment variable
200 */
202 char *library_path;
203 char tmp[MAX_PATH];
204 char *path_str = ::getenv("PATH");
206 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
207 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10);
209 library_path[0] = '\0';
211 GetModuleFileName(NULL, tmp, sizeof(tmp));
212 *(strrchr(tmp, '\\')) = '\0';
213 strcat(library_path, tmp);
215 strcat(library_path, ";.");
217 GetWindowsDirectory(tmp, sizeof(tmp));
218 strcat(library_path, ";");
219 strcat(library_path, tmp);
220 strcat(library_path, PACKAGE_DIR BIN_DIR);
222 GetSystemDirectory(tmp, sizeof(tmp));
223 strcat(library_path, ";");
224 strcat(library_path, tmp);
226 GetWindowsDirectory(tmp, sizeof(tmp));
227 strcat(library_path, ";");
228 strcat(library_path, tmp);
230 if (path_str) {
231 strcat(library_path, ";");
232 strcat(library_path, path_str);
233 }
235 Arguments::set_library_path(library_path);
236 FREE_C_HEAP_ARRAY(char, library_path);
237 }
239 /* Default extensions directory */
240 {
241 char path[MAX_PATH];
242 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
243 GetWindowsDirectory(path, MAX_PATH);
244 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
245 path, PACKAGE_DIR, EXT_DIR);
246 Arguments::set_ext_dirs(buf);
247 }
248 #undef EXT_DIR
249 #undef BIN_DIR
250 #undef PACKAGE_DIR
252 /* Default endorsed standards directory. */
253 {
254 #define ENDORSED_DIR "\\lib\\endorsed"
255 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
256 char * buf = NEW_C_HEAP_ARRAY(char, len);
257 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
258 Arguments::set_endorsed_dirs(buf);
259 #undef ENDORSED_DIR
260 }
262 #ifndef _WIN64
263 SetUnhandledExceptionFilter(Handle_FLT_Exception);
264 #endif
266 // Done
267 return;
268 }
270 void os::breakpoint() {
271 DebugBreak();
272 }
274 // Invoked from the BREAKPOINT Macro
275 extern "C" void breakpoint() {
276 os::breakpoint();
277 }
279 // Returns an estimate of the current stack pointer. Result must be guaranteed
280 // to point into the calling threads stack, and be no lower than the current
281 // stack pointer.
283 address os::current_stack_pointer() {
284 int dummy;
285 address sp = (address)&dummy;
286 return sp;
287 }
289 // os::current_stack_base()
290 //
291 // Returns the base of the stack, which is the stack's
292 // starting address. This function must be called
293 // while running on the stack of the thread being queried.
295 address os::current_stack_base() {
296 MEMORY_BASIC_INFORMATION minfo;
297 address stack_bottom;
298 size_t stack_size;
300 VirtualQuery(&minfo, &minfo, sizeof(minfo));
301 stack_bottom = (address)minfo.AllocationBase;
302 stack_size = minfo.RegionSize;
304 // Add up the sizes of all the regions with the same
305 // AllocationBase.
306 while( 1 )
307 {
308 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
309 if ( stack_bottom == (address)minfo.AllocationBase )
310 stack_size += minfo.RegionSize;
311 else
312 break;
313 }
315 #ifdef _M_IA64
316 // IA64 has memory and register stacks
317 stack_size = stack_size / 2;
318 #endif
319 return stack_bottom + stack_size;
320 }
322 size_t os::current_stack_size() {
323 size_t sz;
324 MEMORY_BASIC_INFORMATION minfo;
325 VirtualQuery(&minfo, &minfo, sizeof(minfo));
326 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
327 return sz;
328 }
331 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
333 // Thread start routine for all new Java threads
334 static unsigned __stdcall java_start(Thread* thread) {
335 // Try to randomize the cache line index of hot stack frames.
336 // This helps when threads of the same stack traces evict each other's
337 // cache lines. The threads can be either from the same JVM instance, or
338 // from different JVM instances. The benefit is especially true for
339 // processors with hyperthreading technology.
340 static int counter = 0;
341 int pid = os::current_process_id();
342 _alloca(((pid ^ counter++) & 7) * 128);
344 OSThread* osthr = thread->osthread();
345 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
347 if (UseNUMA) {
348 int lgrp_id = os::numa_get_group_id();
349 if (lgrp_id != -1) {
350 thread->set_lgrp_id(lgrp_id);
351 }
352 }
355 if (UseVectoredExceptions) {
356 // If we are using vectored exception we don't need to set a SEH
357 thread->run();
358 }
359 else {
360 // Install a win32 structured exception handler around every thread created
361 // by VM, so VM can genrate error dump when an exception occurred in non-
362 // Java thread (e.g. VM thread).
363 __try {
364 thread->run();
365 } __except(topLevelExceptionFilter(
366 (_EXCEPTION_POINTERS*)_exception_info())) {
367 // Nothing to do.
368 }
369 }
371 // One less thread is executing
372 // When the VMThread gets here, the main thread may have already exited
373 // which frees the CodeHeap containing the Atomic::add code
374 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
375 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
376 }
378 return 0;
379 }
381 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
382 // Allocate the OSThread object
383 OSThread* osthread = new OSThread(NULL, NULL);
384 if (osthread == NULL) return NULL;
386 // Initialize support for Java interrupts
387 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
388 if (interrupt_event == NULL) {
389 delete osthread;
390 return NULL;
391 }
392 osthread->set_interrupt_event(interrupt_event);
394 // Store info on the Win32 thread into the OSThread
395 osthread->set_thread_handle(thread_handle);
396 osthread->set_thread_id(thread_id);
398 if (UseNUMA) {
399 int lgrp_id = os::numa_get_group_id();
400 if (lgrp_id != -1) {
401 thread->set_lgrp_id(lgrp_id);
402 }
403 }
405 // Initial thread state is INITIALIZED, not SUSPENDED
406 osthread->set_state(INITIALIZED);
408 return osthread;
409 }
412 bool os::create_attached_thread(JavaThread* thread) {
413 #ifdef ASSERT
414 thread->verify_not_published();
415 #endif
416 HANDLE thread_h;
417 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
418 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
419 fatal("DuplicateHandle failed\n");
420 }
421 OSThread* osthread = create_os_thread(thread, thread_h,
422 (int)current_thread_id());
423 if (osthread == NULL) {
424 return false;
425 }
427 // Initial thread state is RUNNABLE
428 osthread->set_state(RUNNABLE);
430 thread->set_osthread(osthread);
431 return true;
432 }
434 bool os::create_main_thread(JavaThread* thread) {
435 #ifdef ASSERT
436 thread->verify_not_published();
437 #endif
438 if (_starting_thread == NULL) {
439 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
440 if (_starting_thread == NULL) {
441 return false;
442 }
443 }
445 // The primordial thread is runnable from the start)
446 _starting_thread->set_state(RUNNABLE);
448 thread->set_osthread(_starting_thread);
449 return true;
450 }
452 // Allocate and initialize a new OSThread
453 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
454 unsigned thread_id;
456 // Allocate the OSThread object
457 OSThread* osthread = new OSThread(NULL, NULL);
458 if (osthread == NULL) {
459 return false;
460 }
462 // Initialize support for Java interrupts
463 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
464 if (interrupt_event == NULL) {
465 delete osthread;
466 return NULL;
467 }
468 osthread->set_interrupt_event(interrupt_event);
469 osthread->set_interrupted(false);
471 thread->set_osthread(osthread);
473 if (stack_size == 0) {
474 switch (thr_type) {
475 case os::java_thread:
476 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
477 if (JavaThread::stack_size_at_create() > 0)
478 stack_size = JavaThread::stack_size_at_create();
479 break;
480 case os::compiler_thread:
481 if (CompilerThreadStackSize > 0) {
482 stack_size = (size_t)(CompilerThreadStackSize * K);
483 break;
484 } // else fall through:
485 // use VMThreadStackSize if CompilerThreadStackSize is not defined
486 case os::vm_thread:
487 case os::pgc_thread:
488 case os::cgc_thread:
489 case os::watcher_thread:
490 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
491 break;
492 }
493 }
495 // Create the Win32 thread
496 //
497 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
498 // does not specify stack size. Instead, it specifies the size of
499 // initially committed space. The stack size is determined by
500 // PE header in the executable. If the committed "stack_size" is larger
501 // than default value in the PE header, the stack is rounded up to the
502 // nearest multiple of 1MB. For example if the launcher has default
503 // stack size of 320k, specifying any size less than 320k does not
504 // affect the actual stack size at all, it only affects the initial
505 // commitment. On the other hand, specifying 'stack_size' larger than
506 // default value may cause significant increase in memory usage, because
507 // not only the stack space will be rounded up to MB, but also the
508 // entire space is committed upfront.
509 //
510 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
511 // for CreateThread() that can treat 'stack_size' as stack size. However we
512 // are not supposed to call CreateThread() directly according to MSDN
513 // document because JVM uses C runtime library. The good news is that the
514 // flag appears to work with _beginthredex() as well.
516 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
517 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
518 #endif
520 HANDLE thread_handle =
521 (HANDLE)_beginthreadex(NULL,
522 (unsigned)stack_size,
523 (unsigned (__stdcall *)(void*)) java_start,
524 thread,
525 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
526 &thread_id);
527 if (thread_handle == NULL) {
528 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
529 // without the flag.
530 thread_handle =
531 (HANDLE)_beginthreadex(NULL,
532 (unsigned)stack_size,
533 (unsigned (__stdcall *)(void*)) java_start,
534 thread,
535 CREATE_SUSPENDED,
536 &thread_id);
537 }
538 if (thread_handle == NULL) {
539 // Need to clean up stuff we've allocated so far
540 CloseHandle(osthread->interrupt_event());
541 thread->set_osthread(NULL);
542 delete osthread;
543 return NULL;
544 }
546 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
548 // Store info on the Win32 thread into the OSThread
549 osthread->set_thread_handle(thread_handle);
550 osthread->set_thread_id(thread_id);
552 // Initial thread state is INITIALIZED, not SUSPENDED
553 osthread->set_state(INITIALIZED);
555 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
556 return true;
557 }
560 // Free Win32 resources related to the OSThread
561 void os::free_thread(OSThread* osthread) {
562 assert(osthread != NULL, "osthread not set");
563 CloseHandle(osthread->thread_handle());
564 CloseHandle(osthread->interrupt_event());
565 delete osthread;
566 }
569 static int has_performance_count = 0;
570 static jlong first_filetime;
571 static jlong initial_performance_count;
572 static jlong performance_frequency;
575 jlong as_long(LARGE_INTEGER x) {
576 jlong result = 0; // initialization to avoid warning
577 set_high(&result, x.HighPart);
578 set_low(&result, x.LowPart);
579 return result;
580 }
583 jlong os::elapsed_counter() {
584 LARGE_INTEGER count;
585 if (has_performance_count) {
586 QueryPerformanceCounter(&count);
587 return as_long(count) - initial_performance_count;
588 } else {
589 FILETIME wt;
590 GetSystemTimeAsFileTime(&wt);
591 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
592 }
593 }
596 jlong os::elapsed_frequency() {
597 if (has_performance_count) {
598 return performance_frequency;
599 } else {
600 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
601 return 10000000;
602 }
603 }
606 julong os::available_memory() {
607 return win32::available_memory();
608 }
610 julong os::win32::available_memory() {
611 // FIXME: GlobalMemoryStatus() may return incorrect value if total memory
612 // is larger than 4GB
613 MEMORYSTATUS ms;
614 GlobalMemoryStatus(&ms);
616 return (julong)ms.dwAvailPhys;
617 }
619 julong os::physical_memory() {
620 return win32::physical_memory();
621 }
623 julong os::allocatable_physical_memory(julong size) {
624 #ifdef _LP64
625 return size;
626 #else
627 // Limit to 1400m because of the 2gb address space wall
628 return MIN2(size, (julong)1400*M);
629 #endif
630 }
632 // VC6 lacks DWORD_PTR
633 #if _MSC_VER < 1300
634 typedef UINT_PTR DWORD_PTR;
635 #endif
637 int os::active_processor_count() {
638 DWORD_PTR lpProcessAffinityMask = 0;
639 DWORD_PTR lpSystemAffinityMask = 0;
640 int proc_count = processor_count();
641 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
642 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
643 // Nof active processors is number of bits in process affinity mask
644 int bitcount = 0;
645 while (lpProcessAffinityMask != 0) {
646 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
647 bitcount++;
648 }
649 return bitcount;
650 } else {
651 return proc_count;
652 }
653 }
655 bool os::distribute_processes(uint length, uint* distribution) {
656 // Not yet implemented.
657 return false;
658 }
660 bool os::bind_to_processor(uint processor_id) {
661 // Not yet implemented.
662 return false;
663 }
665 static void initialize_performance_counter() {
666 LARGE_INTEGER count;
667 if (QueryPerformanceFrequency(&count)) {
668 has_performance_count = 1;
669 performance_frequency = as_long(count);
670 QueryPerformanceCounter(&count);
671 initial_performance_count = as_long(count);
672 } else {
673 has_performance_count = 0;
674 FILETIME wt;
675 GetSystemTimeAsFileTime(&wt);
676 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
677 }
678 }
681 double os::elapsedTime() {
682 return (double) elapsed_counter() / (double) elapsed_frequency();
683 }
686 // Windows format:
687 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
688 // Java format:
689 // Java standards require the number of milliseconds since 1/1/1970
691 // Constant offset - calculated using offset()
692 static jlong _offset = 116444736000000000;
693 // Fake time counter for reproducible results when debugging
694 static jlong fake_time = 0;
696 #ifdef ASSERT
697 // Just to be safe, recalculate the offset in debug mode
698 static jlong _calculated_offset = 0;
699 static int _has_calculated_offset = 0;
701 jlong offset() {
702 if (_has_calculated_offset) return _calculated_offset;
703 SYSTEMTIME java_origin;
704 java_origin.wYear = 1970;
705 java_origin.wMonth = 1;
706 java_origin.wDayOfWeek = 0; // ignored
707 java_origin.wDay = 1;
708 java_origin.wHour = 0;
709 java_origin.wMinute = 0;
710 java_origin.wSecond = 0;
711 java_origin.wMilliseconds = 0;
712 FILETIME jot;
713 if (!SystemTimeToFileTime(&java_origin, &jot)) {
714 fatal1("Error = %d\nWindows error", GetLastError());
715 }
716 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
717 _has_calculated_offset = 1;
718 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
719 return _calculated_offset;
720 }
721 #else
722 jlong offset() {
723 return _offset;
724 }
725 #endif
727 jlong windows_to_java_time(FILETIME wt) {
728 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
729 return (a - offset()) / 10000;
730 }
732 FILETIME java_to_windows_time(jlong l) {
733 jlong a = (l * 10000) + offset();
734 FILETIME result;
735 result.dwHighDateTime = high(a);
736 result.dwLowDateTime = low(a);
737 return result;
738 }
740 // For now, we say that Windows does not support vtime. I have no idea
741 // whether it can actually be made to (DLD, 9/13/05).
743 bool os::supports_vtime() { return false; }
744 bool os::enable_vtime() { return false; }
745 bool os::vtime_enabled() { return false; }
746 double os::elapsedVTime() {
747 // better than nothing, but not much
748 return elapsedTime();
749 }
751 jlong os::javaTimeMillis() {
752 if (UseFakeTimers) {
753 return fake_time++;
754 } else {
755 FILETIME wt;
756 GetSystemTimeAsFileTime(&wt);
757 return windows_to_java_time(wt);
758 }
759 }
761 #define NANOS_PER_SEC CONST64(1000000000)
762 #define NANOS_PER_MILLISEC 1000000
763 jlong os::javaTimeNanos() {
764 if (!has_performance_count) {
765 return javaTimeMillis() * NANOS_PER_MILLISEC; // the best we can do.
766 } else {
767 LARGE_INTEGER current_count;
768 QueryPerformanceCounter(¤t_count);
769 double current = as_long(current_count);
770 double freq = performance_frequency;
771 jlong time = (jlong)((current/freq) * NANOS_PER_SEC);
772 return time;
773 }
774 }
776 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
777 if (!has_performance_count) {
778 // javaTimeMillis() doesn't have much percision,
779 // but it is not going to wrap -- so all 64 bits
780 info_ptr->max_value = ALL_64_BITS;
782 // this is a wall clock timer, so may skip
783 info_ptr->may_skip_backward = true;
784 info_ptr->may_skip_forward = true;
785 } else {
786 jlong freq = performance_frequency;
787 if (freq < NANOS_PER_SEC) {
788 // the performance counter is 64 bits and we will
789 // be multiplying it -- so no wrap in 64 bits
790 info_ptr->max_value = ALL_64_BITS;
791 } else if (freq > NANOS_PER_SEC) {
792 // use the max value the counter can reach to
793 // determine the max value which could be returned
794 julong max_counter = (julong)ALL_64_BITS;
795 info_ptr->max_value = (jlong)(max_counter / (freq / NANOS_PER_SEC));
796 } else {
797 // the performance counter is 64 bits and we will
798 // be using it directly -- so no wrap in 64 bits
799 info_ptr->max_value = ALL_64_BITS;
800 }
802 // using a counter, so no skipping
803 info_ptr->may_skip_backward = false;
804 info_ptr->may_skip_forward = false;
805 }
806 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
807 }
809 char* os::local_time_string(char *buf, size_t buflen) {
810 SYSTEMTIME st;
811 GetLocalTime(&st);
812 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
813 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
814 return buf;
815 }
817 bool os::getTimesSecs(double* process_real_time,
818 double* process_user_time,
819 double* process_system_time) {
820 HANDLE h_process = GetCurrentProcess();
821 FILETIME create_time, exit_time, kernel_time, user_time;
822 BOOL result = GetProcessTimes(h_process,
823 &create_time,
824 &exit_time,
825 &kernel_time,
826 &user_time);
827 if (result != 0) {
828 FILETIME wt;
829 GetSystemTimeAsFileTime(&wt);
830 jlong rtc_millis = windows_to_java_time(wt);
831 jlong user_millis = windows_to_java_time(user_time);
832 jlong system_millis = windows_to_java_time(kernel_time);
833 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
834 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
835 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
836 return true;
837 } else {
838 return false;
839 }
840 }
842 void os::shutdown() {
844 // allow PerfMemory to attempt cleanup of any persistent resources
845 perfMemory_exit();
847 // flush buffered output, finish log files
848 ostream_abort();
850 // Check for abort hook
851 abort_hook_t abort_hook = Arguments::abort_hook();
852 if (abort_hook != NULL) {
853 abort_hook();
854 }
855 }
857 void os::abort(bool dump_core)
858 {
859 os::shutdown();
860 // no core dump on Windows
861 ::exit(1);
862 }
864 // Die immediately, no exit hook, no abort hook, no cleanup.
865 void os::die() {
866 _exit(-1);
867 }
869 // Directory routines copied from src/win32/native/java/io/dirent_md.c
870 // * dirent_md.c 1.15 00/02/02
871 //
872 // The declarations for DIR and struct dirent are in jvm_win32.h.
874 /* Caller must have already run dirname through JVM_NativePath, which removes
875 duplicate slashes and converts all instances of '/' into '\\'. */
877 DIR *
878 os::opendir(const char *dirname)
879 {
880 assert(dirname != NULL, "just checking"); // hotspot change
881 DIR *dirp = (DIR *)malloc(sizeof(DIR));
882 DWORD fattr; // hotspot change
883 char alt_dirname[4] = { 0, 0, 0, 0 };
885 if (dirp == 0) {
886 errno = ENOMEM;
887 return 0;
888 }
890 /*
891 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
892 * as a directory in FindFirstFile(). We detect this case here and
893 * prepend the current drive name.
894 */
895 if (dirname[1] == '\0' && dirname[0] == '\\') {
896 alt_dirname[0] = _getdrive() + 'A' - 1;
897 alt_dirname[1] = ':';
898 alt_dirname[2] = '\\';
899 alt_dirname[3] = '\0';
900 dirname = alt_dirname;
901 }
903 dirp->path = (char *)malloc(strlen(dirname) + 5);
904 if (dirp->path == 0) {
905 free(dirp);
906 errno = ENOMEM;
907 return 0;
908 }
909 strcpy(dirp->path, dirname);
911 fattr = GetFileAttributes(dirp->path);
912 if (fattr == 0xffffffff) {
913 free(dirp->path);
914 free(dirp);
915 errno = ENOENT;
916 return 0;
917 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
918 free(dirp->path);
919 free(dirp);
920 errno = ENOTDIR;
921 return 0;
922 }
924 /* Append "*.*", or possibly "\\*.*", to path */
925 if (dirp->path[1] == ':'
926 && (dirp->path[2] == '\0'
927 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
928 /* No '\\' needed for cases like "Z:" or "Z:\" */
929 strcat(dirp->path, "*.*");
930 } else {
931 strcat(dirp->path, "\\*.*");
932 }
934 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
935 if (dirp->handle == INVALID_HANDLE_VALUE) {
936 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
937 free(dirp->path);
938 free(dirp);
939 errno = EACCES;
940 return 0;
941 }
942 }
943 return dirp;
944 }
946 /* parameter dbuf unused on Windows */
948 struct dirent *
949 os::readdir(DIR *dirp, dirent *dbuf)
950 {
951 assert(dirp != NULL, "just checking"); // hotspot change
952 if (dirp->handle == INVALID_HANDLE_VALUE) {
953 return 0;
954 }
956 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
958 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
959 if (GetLastError() == ERROR_INVALID_HANDLE) {
960 errno = EBADF;
961 return 0;
962 }
963 FindClose(dirp->handle);
964 dirp->handle = INVALID_HANDLE_VALUE;
965 }
967 return &dirp->dirent;
968 }
970 int
971 os::closedir(DIR *dirp)
972 {
973 assert(dirp != NULL, "just checking"); // hotspot change
974 if (dirp->handle != INVALID_HANDLE_VALUE) {
975 if (!FindClose(dirp->handle)) {
976 errno = EBADF;
977 return -1;
978 }
979 dirp->handle = INVALID_HANDLE_VALUE;
980 }
981 free(dirp->path);
982 free(dirp);
983 return 0;
984 }
986 const char* os::dll_file_extension() { return ".dll"; }
988 const char * os::get_temp_directory()
989 {
990 static char path_buf[MAX_PATH];
991 if (GetTempPath(MAX_PATH, path_buf)>0)
992 return path_buf;
993 else{
994 path_buf[0]='\0';
995 return path_buf;
996 }
997 }
999 void os::dll_build_name(char *holder, size_t holderlen,
1000 const char* pname, const char* fname)
1001 {
1002 // copied from libhpi
1003 const size_t pnamelen = pname ? strlen(pname) : 0;
1004 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1006 /* Quietly truncates on buffer overflow. Should be an error. */
1007 if (pnamelen + strlen(fname) + 10 > holderlen) {
1008 *holder = '\0';
1009 return;
1010 }
1012 if (pnamelen == 0) {
1013 sprintf(holder, "%s.dll", fname);
1014 } else if (c == ':' || c == '\\') {
1015 sprintf(holder, "%s%s.dll", pname, fname);
1016 } else {
1017 sprintf(holder, "%s\\%s.dll", pname, fname);
1018 }
1019 }
1021 // Needs to be in os specific directory because windows requires another
1022 // header file <direct.h>
1023 const char* os::get_current_directory(char *buf, int buflen) {
1024 return _getcwd(buf, buflen);
1025 }
1027 //-----------------------------------------------------------
1028 // Helper functions for fatal error handler
1030 // The following library functions are resolved dynamically at runtime:
1032 // PSAPI functions, for Windows NT, 2000, XP
1034 // psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform
1035 // SDK from Microsoft. Here are the definitions copied from psapi.h
1036 typedef struct _MODULEINFO {
1037 LPVOID lpBaseOfDll;
1038 DWORD SizeOfImage;
1039 LPVOID EntryPoint;
1040 } MODULEINFO, *LPMODULEINFO;
1042 static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD );
1043 static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD );
1044 static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD );
1046 // ToolHelp Functions, for Windows 95, 98 and ME
1048 static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ;
1049 static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ;
1050 static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ;
1052 bool _has_psapi;
1053 bool _psapi_init = false;
1054 bool _has_toolhelp;
1056 static bool _init_psapi() {
1057 HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ;
1058 if( psapi == NULL ) return false ;
1060 _EnumProcessModules = CAST_TO_FN_PTR(
1061 BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD),
1062 GetProcAddress(psapi, "EnumProcessModules")) ;
1063 _GetModuleFileNameEx = CAST_TO_FN_PTR(
1064 DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD),
1065 GetProcAddress(psapi, "GetModuleFileNameExA"));
1066 _GetModuleInformation = CAST_TO_FN_PTR(
1067 BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD),
1068 GetProcAddress(psapi, "GetModuleInformation"));
1070 _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation);
1071 _psapi_init = true;
1072 return _has_psapi;
1073 }
1075 static bool _init_toolhelp() {
1076 HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ;
1077 if (kernel32 == NULL) return false ;
1079 _CreateToolhelp32Snapshot = CAST_TO_FN_PTR(
1080 HANDLE(WINAPI *)(DWORD,DWORD),
1081 GetProcAddress(kernel32, "CreateToolhelp32Snapshot"));
1082 _Module32First = CAST_TO_FN_PTR(
1083 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1084 GetProcAddress(kernel32, "Module32First" ));
1085 _Module32Next = CAST_TO_FN_PTR(
1086 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1087 GetProcAddress(kernel32, "Module32Next" ));
1089 _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next);
1090 return _has_toolhelp;
1091 }
1093 #ifdef _WIN64
1094 // Helper routine which returns true if address in
1095 // within the NTDLL address space.
1096 //
1097 static bool _addr_in_ntdll( address addr )
1098 {
1099 HMODULE hmod;
1100 MODULEINFO minfo;
1102 hmod = GetModuleHandle("NTDLL.DLL");
1103 if ( hmod == NULL ) return false;
1104 if ( !_GetModuleInformation( GetCurrentProcess(), hmod,
1105 &minfo, sizeof(MODULEINFO)) )
1106 return false;
1108 if ( (addr >= minfo.lpBaseOfDll) &&
1109 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1110 return true;
1111 else
1112 return false;
1113 }
1114 #endif
1117 // Enumerate all modules for a given process ID
1118 //
1119 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1120 // different API for doing this. We use PSAPI.DLL on NT based
1121 // Windows and ToolHelp on 95/98/Me.
1123 // Callback function that is called by enumerate_modules() on
1124 // every DLL module.
1125 // Input parameters:
1126 // int pid,
1127 // char* module_file_name,
1128 // address module_base_addr,
1129 // unsigned module_size,
1130 // void* param
1131 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1133 // enumerate_modules for Windows NT, using PSAPI
1134 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1135 {
1136 HANDLE hProcess ;
1138 # define MAX_NUM_MODULES 128
1139 HMODULE modules[MAX_NUM_MODULES];
1140 static char filename[ MAX_PATH ];
1141 int result = 0;
1143 if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0;
1145 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1146 FALSE, pid ) ;
1147 if (hProcess == NULL) return 0;
1149 DWORD size_needed;
1150 if (!_EnumProcessModules(hProcess, modules,
1151 sizeof(modules), &size_needed)) {
1152 CloseHandle( hProcess );
1153 return 0;
1154 }
1156 // number of modules that are currently loaded
1157 int num_modules = size_needed / sizeof(HMODULE);
1159 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1160 // Get Full pathname:
1161 if(!_GetModuleFileNameEx(hProcess, modules[i],
1162 filename, sizeof(filename))) {
1163 filename[0] = '\0';
1164 }
1166 MODULEINFO modinfo;
1167 if (!_GetModuleInformation(hProcess, modules[i],
1168 &modinfo, sizeof(modinfo))) {
1169 modinfo.lpBaseOfDll = NULL;
1170 modinfo.SizeOfImage = 0;
1171 }
1173 // Invoke callback function
1174 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1175 modinfo.SizeOfImage, param);
1176 if (result) break;
1177 }
1179 CloseHandle( hProcess ) ;
1180 return result;
1181 }
1184 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1185 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1186 {
1187 HANDLE hSnapShot ;
1188 static MODULEENTRY32 modentry ;
1189 int result = 0;
1191 if (!_has_toolhelp) return 0;
1193 // Get a handle to a Toolhelp snapshot of the system
1194 hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1195 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1196 return FALSE ;
1197 }
1199 // iterate through all modules
1200 modentry.dwSize = sizeof(MODULEENTRY32) ;
1201 bool not_done = _Module32First( hSnapShot, &modentry ) != 0;
1203 while( not_done ) {
1204 // invoke the callback
1205 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1206 modentry.modBaseSize, param);
1207 if (result) break;
1209 modentry.dwSize = sizeof(MODULEENTRY32) ;
1210 not_done = _Module32Next( hSnapShot, &modentry ) != 0;
1211 }
1213 CloseHandle(hSnapShot);
1214 return result;
1215 }
1217 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1218 {
1219 // Get current process ID if caller doesn't provide it.
1220 if (!pid) pid = os::current_process_id();
1222 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1223 else return _enumerate_modules_windows(pid, func, param);
1224 }
1226 struct _modinfo {
1227 address addr;
1228 char* full_path; // point to a char buffer
1229 int buflen; // size of the buffer
1230 address base_addr;
1231 };
1233 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1234 unsigned size, void * param) {
1235 struct _modinfo *pmod = (struct _modinfo *)param;
1236 if (!pmod) return -1;
1238 if (base_addr <= pmod->addr &&
1239 base_addr+size > pmod->addr) {
1240 // if a buffer is provided, copy path name to the buffer
1241 if (pmod->full_path) {
1242 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1243 }
1244 pmod->base_addr = base_addr;
1245 return 1;
1246 }
1247 return 0;
1248 }
1250 bool os::dll_address_to_library_name(address addr, char* buf,
1251 int buflen, int* offset) {
1252 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1253 // return the full path to the DLL file, sometimes it returns path
1254 // to the corresponding PDB file (debug info); sometimes it only
1255 // returns partial path, which makes life painful.
1257 struct _modinfo mi;
1258 mi.addr = addr;
1259 mi.full_path = buf;
1260 mi.buflen = buflen;
1261 int pid = os::current_process_id();
1262 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1263 // buf already contains path name
1264 if (offset) *offset = addr - mi.base_addr;
1265 return true;
1266 } else {
1267 if (buf) buf[0] = '\0';
1268 if (offset) *offset = -1;
1269 return false;
1270 }
1271 }
1273 bool os::dll_address_to_function_name(address addr, char *buf,
1274 int buflen, int *offset) {
1275 // Unimplemented on Windows - in order to use SymGetSymFromAddr(),
1276 // we need to initialize imagehlp/dbghelp, then load symbol table
1277 // for every module. That's too much work to do after a fatal error.
1278 // For an example on how to implement this function, see 1.4.2.
1279 if (offset) *offset = -1;
1280 if (buf) buf[0] = '\0';
1281 return false;
1282 }
1284 void* os::dll_lookup(void* handle, const char* name) {
1285 return GetProcAddress((HMODULE)handle, name);
1286 }
1288 // save the start and end address of jvm.dll into param[0] and param[1]
1289 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1290 unsigned size, void * param) {
1291 if (!param) return -1;
1293 if (base_addr <= (address)_locate_jvm_dll &&
1294 base_addr+size > (address)_locate_jvm_dll) {
1295 ((address*)param)[0] = base_addr;
1296 ((address*)param)[1] = base_addr + size;
1297 return 1;
1298 }
1299 return 0;
1300 }
1302 address vm_lib_location[2]; // start and end address of jvm.dll
1304 // check if addr is inside jvm.dll
1305 bool os::address_is_in_vm(address addr) {
1306 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1307 int pid = os::current_process_id();
1308 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1309 assert(false, "Can't find jvm module.");
1310 return false;
1311 }
1312 }
1314 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1315 }
1317 // print module info; param is outputStream*
1318 static int _print_module(int pid, char* fname, address base,
1319 unsigned size, void* param) {
1320 if (!param) return -1;
1322 outputStream* st = (outputStream*)param;
1324 address end_addr = base + size;
1325 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1326 return 0;
1327 }
1329 // Loads .dll/.so and
1330 // in case of error it checks if .dll/.so was built for the
1331 // same architecture as Hotspot is running on
1332 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1333 {
1334 void * result = LoadLibrary(name);
1335 if (result != NULL)
1336 {
1337 return result;
1338 }
1340 long errcode = GetLastError();
1341 if (errcode == ERROR_MOD_NOT_FOUND) {
1342 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1343 ebuf[ebuflen-1]='\0';
1344 return NULL;
1345 }
1347 // Parsing dll below
1348 // If we can read dll-info and find that dll was built
1349 // for an architecture other than Hotspot is running in
1350 // - then print to buffer "DLL was built for a different architecture"
1351 // else call getLastErrorString to obtain system error message
1353 // Read system error message into ebuf
1354 // It may or may not be overwritten below (in the for loop and just above)
1355 getLastErrorString(ebuf, (size_t) ebuflen);
1356 ebuf[ebuflen-1]='\0';
1357 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1358 if (file_descriptor<0)
1359 {
1360 return NULL;
1361 }
1363 uint32_t signature_offset;
1364 uint16_t lib_arch=0;
1365 bool failed_to_get_lib_arch=
1366 (
1367 //Go to position 3c in the dll
1368 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1369 ||
1370 // Read loacation of signature
1371 (sizeof(signature_offset)!=
1372 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1373 ||
1374 //Go to COFF File Header in dll
1375 //that is located after"signature" (4 bytes long)
1376 (os::seek_to_file_offset(file_descriptor,
1377 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1378 ||
1379 //Read field that contains code of architecture
1380 // that dll was build for
1381 (sizeof(lib_arch)!=
1382 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1383 );
1385 ::close(file_descriptor);
1386 if (failed_to_get_lib_arch)
1387 {
1388 // file i/o error - report getLastErrorString(...) msg
1389 return NULL;
1390 }
1392 typedef struct
1393 {
1394 uint16_t arch_code;
1395 char* arch_name;
1396 } arch_t;
1398 static const arch_t arch_array[]={
1399 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1400 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1401 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1402 };
1403 #if (defined _M_IA64)
1404 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1405 #elif (defined _M_AMD64)
1406 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1407 #elif (defined _M_IX86)
1408 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1409 #else
1410 #error Method os::dll_load requires that one of following \
1411 is defined :_M_IA64,_M_AMD64 or _M_IX86
1412 #endif
1415 // Obtain a string for printf operation
1416 // lib_arch_str shall contain string what platform this .dll was built for
1417 // running_arch_str shall string contain what platform Hotspot was built for
1418 char *running_arch_str=NULL,*lib_arch_str=NULL;
1419 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1420 {
1421 if (lib_arch==arch_array[i].arch_code)
1422 lib_arch_str=arch_array[i].arch_name;
1423 if (running_arch==arch_array[i].arch_code)
1424 running_arch_str=arch_array[i].arch_name;
1425 }
1427 assert(running_arch_str,
1428 "Didn't find runing architecture code in arch_array");
1430 // If the architure is right
1431 // but some other error took place - report getLastErrorString(...) msg
1432 if (lib_arch == running_arch)
1433 {
1434 return NULL;
1435 }
1437 if (lib_arch_str!=NULL)
1438 {
1439 ::_snprintf(ebuf, ebuflen-1,
1440 "Can't load %s-bit .dll on a %s-bit platform",
1441 lib_arch_str,running_arch_str);
1442 }
1443 else
1444 {
1445 // don't know what architecture this dll was build for
1446 ::_snprintf(ebuf, ebuflen-1,
1447 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1448 lib_arch,running_arch_str);
1449 }
1451 return NULL;
1452 }
1455 void os::print_dll_info(outputStream *st) {
1456 int pid = os::current_process_id();
1457 st->print_cr("Dynamic libraries:");
1458 enumerate_modules(pid, _print_module, (void *)st);
1459 }
1461 // function pointer to Windows API "GetNativeSystemInfo".
1462 typedef void (WINAPI *GetNativeSystemInfo_func_type)(LPSYSTEM_INFO);
1463 static GetNativeSystemInfo_func_type _GetNativeSystemInfo;
1465 void os::print_os_info(outputStream* st) {
1466 st->print("OS:");
1468 OSVERSIONINFOEX osvi;
1469 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1470 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1472 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1473 st->print_cr("N/A");
1474 return;
1475 }
1477 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1478 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1479 switch (os_vers) {
1480 case 3051: st->print(" Windows NT 3.51"); break;
1481 case 4000: st->print(" Windows NT 4.0"); break;
1482 case 5000: st->print(" Windows 2000"); break;
1483 case 5001: st->print(" Windows XP"); break;
1484 case 5002:
1485 case 6000: {
1486 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1487 // find out whether we are running on 64 bit processor or not.
1488 SYSTEM_INFO si;
1489 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1490 // Check to see if _GetNativeSystemInfo has been initialized.
1491 if (_GetNativeSystemInfo == NULL) {
1492 HMODULE hKernel32 = GetModuleHandle(TEXT("kernel32.dll"));
1493 _GetNativeSystemInfo =
1494 CAST_TO_FN_PTR(GetNativeSystemInfo_func_type,
1495 GetProcAddress(hKernel32,
1496 "GetNativeSystemInfo"));
1497 if (_GetNativeSystemInfo == NULL)
1498 GetSystemInfo(&si);
1499 } else {
1500 _GetNativeSystemInfo(&si);
1501 }
1502 if (os_vers == 5002) {
1503 if (osvi.wProductType == VER_NT_WORKSTATION &&
1504 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1505 st->print(" Windows XP x64 Edition");
1506 else
1507 st->print(" Windows Server 2003 family");
1508 } else { // os_vers == 6000
1509 if (osvi.wProductType == VER_NT_WORKSTATION)
1510 st->print(" Windows Vista");
1511 else
1512 st->print(" Windows Server 2008");
1513 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1514 st->print(" , 64 bit");
1515 }
1516 break;
1517 }
1518 default: // future windows, print out its major and minor versions
1519 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1520 }
1521 } else {
1522 switch (os_vers) {
1523 case 4000: st->print(" Windows 95"); break;
1524 case 4010: st->print(" Windows 98"); break;
1525 case 4090: st->print(" Windows Me"); break;
1526 default: // future windows, print out its major and minor versions
1527 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1528 }
1529 }
1530 st->print(" Build %d", osvi.dwBuildNumber);
1531 st->print(" %s", osvi.szCSDVersion); // service pack
1532 st->cr();
1533 }
1535 void os::print_memory_info(outputStream* st) {
1536 st->print("Memory:");
1537 st->print(" %dk page", os::vm_page_size()>>10);
1539 // FIXME: GlobalMemoryStatus() may return incorrect value if total memory
1540 // is larger than 4GB
1541 MEMORYSTATUS ms;
1542 GlobalMemoryStatus(&ms);
1544 st->print(", physical %uk", os::physical_memory() >> 10);
1545 st->print("(%uk free)", os::available_memory() >> 10);
1547 st->print(", swap %uk", ms.dwTotalPageFile >> 10);
1548 st->print("(%uk free)", ms.dwAvailPageFile >> 10);
1549 st->cr();
1550 }
1552 void os::print_siginfo(outputStream *st, void *siginfo) {
1553 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1554 st->print("siginfo:");
1555 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1557 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1558 er->NumberParameters >= 2) {
1559 switch (er->ExceptionInformation[0]) {
1560 case 0: st->print(", reading address"); break;
1561 case 1: st->print(", writing address"); break;
1562 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1563 er->ExceptionInformation[0]);
1564 }
1565 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1566 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1567 er->NumberParameters >= 2 && UseSharedSpaces) {
1568 FileMapInfo* mapinfo = FileMapInfo::current_info();
1569 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1570 st->print("\n\nError accessing class data sharing archive." \
1571 " Mapped file inaccessible during execution, " \
1572 " possible disk/network problem.");
1573 }
1574 } else {
1575 int num = er->NumberParameters;
1576 if (num > 0) {
1577 st->print(", ExceptionInformation=");
1578 for (int i = 0; i < num; i++) {
1579 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1580 }
1581 }
1582 }
1583 st->cr();
1584 }
1586 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1587 // do nothing
1588 }
1590 static char saved_jvm_path[MAX_PATH] = {0};
1592 // Find the full path to the current module, jvm.dll or jvm_g.dll
1593 void os::jvm_path(char *buf, jint buflen) {
1594 // Error checking.
1595 if (buflen < MAX_PATH) {
1596 assert(false, "must use a large-enough buffer");
1597 buf[0] = '\0';
1598 return;
1599 }
1600 // Lazy resolve the path to current module.
1601 if (saved_jvm_path[0] != 0) {
1602 strcpy(buf, saved_jvm_path);
1603 return;
1604 }
1606 GetModuleFileName(vm_lib_handle, buf, buflen);
1607 strcpy(saved_jvm_path, buf);
1608 }
1611 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1612 #ifndef _WIN64
1613 st->print("_");
1614 #endif
1615 }
1618 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1619 #ifndef _WIN64
1620 st->print("@%d", args_size * sizeof(int));
1621 #endif
1622 }
1624 // sun.misc.Signal
1625 // NOTE that this is a workaround for an apparent kernel bug where if
1626 // a signal handler for SIGBREAK is installed then that signal handler
1627 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1628 // See bug 4416763.
1629 static void (*sigbreakHandler)(int) = NULL;
1631 static void UserHandler(int sig, void *siginfo, void *context) {
1632 os::signal_notify(sig);
1633 // We need to reinstate the signal handler each time...
1634 os::signal(sig, (void*)UserHandler);
1635 }
1637 void* os::user_handler() {
1638 return (void*) UserHandler;
1639 }
1641 void* os::signal(int signal_number, void* handler) {
1642 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1643 void (*oldHandler)(int) = sigbreakHandler;
1644 sigbreakHandler = (void (*)(int)) handler;
1645 return (void*) oldHandler;
1646 } else {
1647 return (void*)::signal(signal_number, (void (*)(int))handler);
1648 }
1649 }
1651 void os::signal_raise(int signal_number) {
1652 raise(signal_number);
1653 }
1655 // The Win32 C runtime library maps all console control events other than ^C
1656 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1657 // logoff, and shutdown events. We therefore install our own console handler
1658 // that raises SIGTERM for the latter cases.
1659 //
1660 static BOOL WINAPI consoleHandler(DWORD event) {
1661 switch(event) {
1662 case CTRL_C_EVENT:
1663 if (is_error_reported()) {
1664 // Ctrl-C is pressed during error reporting, likely because the error
1665 // handler fails to abort. Let VM die immediately.
1666 os::die();
1667 }
1669 os::signal_raise(SIGINT);
1670 return TRUE;
1671 break;
1672 case CTRL_BREAK_EVENT:
1673 if (sigbreakHandler != NULL) {
1674 (*sigbreakHandler)(SIGBREAK);
1675 }
1676 return TRUE;
1677 break;
1678 case CTRL_CLOSE_EVENT:
1679 case CTRL_LOGOFF_EVENT:
1680 case CTRL_SHUTDOWN_EVENT:
1681 os::signal_raise(SIGTERM);
1682 return TRUE;
1683 break;
1684 default:
1685 break;
1686 }
1687 return FALSE;
1688 }
1690 /*
1691 * The following code is moved from os.cpp for making this
1692 * code platform specific, which it is by its very nature.
1693 */
1695 // Return maximum OS signal used + 1 for internal use only
1696 // Used as exit signal for signal_thread
1697 int os::sigexitnum_pd(){
1698 return NSIG;
1699 }
1701 // a counter for each possible signal value, including signal_thread exit signal
1702 static volatile jint pending_signals[NSIG+1] = { 0 };
1703 static HANDLE sig_sem;
1705 void os::signal_init_pd() {
1706 // Initialize signal structures
1707 memset((void*)pending_signals, 0, sizeof(pending_signals));
1709 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
1711 // Programs embedding the VM do not want it to attempt to receive
1712 // events like CTRL_LOGOFF_EVENT, which are used to implement the
1713 // shutdown hooks mechanism introduced in 1.3. For example, when
1714 // the VM is run as part of a Windows NT service (i.e., a servlet
1715 // engine in a web server), the correct behavior is for any console
1716 // control handler to return FALSE, not TRUE, because the OS's
1717 // "final" handler for such events allows the process to continue if
1718 // it is a service (while terminating it if it is not a service).
1719 // To make this behavior uniform and the mechanism simpler, we
1720 // completely disable the VM's usage of these console events if -Xrs
1721 // (=ReduceSignalUsage) is specified. This means, for example, that
1722 // the CTRL-BREAK thread dump mechanism is also disabled in this
1723 // case. See bugs 4323062, 4345157, and related bugs.
1725 if (!ReduceSignalUsage) {
1726 // Add a CTRL-C handler
1727 SetConsoleCtrlHandler(consoleHandler, TRUE);
1728 }
1729 }
1731 void os::signal_notify(int signal_number) {
1732 BOOL ret;
1734 Atomic::inc(&pending_signals[signal_number]);
1735 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1736 assert(ret != 0, "ReleaseSemaphore() failed");
1737 }
1739 static int check_pending_signals(bool wait_for_signal) {
1740 DWORD ret;
1741 while (true) {
1742 for (int i = 0; i < NSIG + 1; i++) {
1743 jint n = pending_signals[i];
1744 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1745 return i;
1746 }
1747 }
1748 if (!wait_for_signal) {
1749 return -1;
1750 }
1752 JavaThread *thread = JavaThread::current();
1754 ThreadBlockInVM tbivm(thread);
1756 bool threadIsSuspended;
1757 do {
1758 thread->set_suspend_equivalent();
1759 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1760 ret = ::WaitForSingleObject(sig_sem, INFINITE);
1761 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
1763 // were we externally suspended while we were waiting?
1764 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1765 if (threadIsSuspended) {
1766 //
1767 // The semaphore has been incremented, but while we were waiting
1768 // another thread suspended us. We don't want to continue running
1769 // while suspended because that would surprise the thread that
1770 // suspended us.
1771 //
1772 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1773 assert(ret != 0, "ReleaseSemaphore() failed");
1775 thread->java_suspend_self();
1776 }
1777 } while (threadIsSuspended);
1778 }
1779 }
1781 int os::signal_lookup() {
1782 return check_pending_signals(false);
1783 }
1785 int os::signal_wait() {
1786 return check_pending_signals(true);
1787 }
1789 // Implicit OS exception handling
1791 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
1792 JavaThread* thread = JavaThread::current();
1793 // Save pc in thread
1794 #ifdef _M_IA64
1795 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP);
1796 // Set pc to handler
1797 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
1798 #elif _M_AMD64
1799 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip);
1800 // Set pc to handler
1801 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
1802 #else
1803 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip);
1804 // Set pc to handler
1805 exceptionInfo->ContextRecord->Eip = (LONG)handler;
1806 #endif
1808 // Continue the execution
1809 return EXCEPTION_CONTINUE_EXECUTION;
1810 }
1813 // Used for PostMortemDump
1814 extern "C" void safepoints();
1815 extern "C" void find(int x);
1816 extern "C" void events();
1818 // According to Windows API documentation, an illegal instruction sequence should generate
1819 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
1820 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
1821 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
1823 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
1825 // From "Execution Protection in the Windows Operating System" draft 0.35
1826 // Once a system header becomes available, the "real" define should be
1827 // included or copied here.
1828 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
1830 #define def_excpt(val) #val, val
1832 struct siglabel {
1833 char *name;
1834 int number;
1835 };
1837 struct siglabel exceptlabels[] = {
1838 def_excpt(EXCEPTION_ACCESS_VIOLATION),
1839 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
1840 def_excpt(EXCEPTION_BREAKPOINT),
1841 def_excpt(EXCEPTION_SINGLE_STEP),
1842 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
1843 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
1844 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
1845 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
1846 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
1847 def_excpt(EXCEPTION_FLT_OVERFLOW),
1848 def_excpt(EXCEPTION_FLT_STACK_CHECK),
1849 def_excpt(EXCEPTION_FLT_UNDERFLOW),
1850 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
1851 def_excpt(EXCEPTION_INT_OVERFLOW),
1852 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
1853 def_excpt(EXCEPTION_IN_PAGE_ERROR),
1854 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
1855 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
1856 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
1857 def_excpt(EXCEPTION_STACK_OVERFLOW),
1858 def_excpt(EXCEPTION_INVALID_DISPOSITION),
1859 def_excpt(EXCEPTION_GUARD_PAGE),
1860 def_excpt(EXCEPTION_INVALID_HANDLE),
1861 NULL, 0
1862 };
1864 const char* os::exception_name(int exception_code, char *buf, size_t size) {
1865 for (int i = 0; exceptlabels[i].name != NULL; i++) {
1866 if (exceptlabels[i].number == exception_code) {
1867 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
1868 return buf;
1869 }
1870 }
1872 return NULL;
1873 }
1875 //-----------------------------------------------------------------------------
1876 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
1877 // handle exception caused by idiv; should only happen for -MinInt/-1
1878 // (division by zero is handled explicitly)
1879 #ifdef _M_IA64
1880 assert(0, "Fix Handle_IDiv_Exception");
1881 #elif _M_AMD64
1882 PCONTEXT ctx = exceptionInfo->ContextRecord;
1883 address pc = (address)ctx->Rip;
1884 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
1885 assert(pc[0] == 0xF7, "not an idiv opcode");
1886 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
1887 assert(ctx->Rax == min_jint, "unexpected idiv exception");
1888 // set correct result values and continue after idiv instruction
1889 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
1890 ctx->Rax = (DWORD)min_jint; // result
1891 ctx->Rdx = (DWORD)0; // remainder
1892 // Continue the execution
1893 #else
1894 PCONTEXT ctx = exceptionInfo->ContextRecord;
1895 address pc = (address)ctx->Eip;
1896 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
1897 assert(pc[0] == 0xF7, "not an idiv opcode");
1898 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
1899 assert(ctx->Eax == min_jint, "unexpected idiv exception");
1900 // set correct result values and continue after idiv instruction
1901 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
1902 ctx->Eax = (DWORD)min_jint; // result
1903 ctx->Edx = (DWORD)0; // remainder
1904 // Continue the execution
1905 #endif
1906 return EXCEPTION_CONTINUE_EXECUTION;
1907 }
1909 #ifndef _WIN64
1910 //-----------------------------------------------------------------------------
1911 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
1912 // handle exception caused by native mothod modifying control word
1913 PCONTEXT ctx = exceptionInfo->ContextRecord;
1914 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
1916 switch (exception_code) {
1917 case EXCEPTION_FLT_DENORMAL_OPERAND:
1918 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
1919 case EXCEPTION_FLT_INEXACT_RESULT:
1920 case EXCEPTION_FLT_INVALID_OPERATION:
1921 case EXCEPTION_FLT_OVERFLOW:
1922 case EXCEPTION_FLT_STACK_CHECK:
1923 case EXCEPTION_FLT_UNDERFLOW:
1924 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
1925 if (fp_control_word != ctx->FloatSave.ControlWord) {
1926 // Restore FPCW and mask out FLT exceptions
1927 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
1928 // Mask out pending FLT exceptions
1929 ctx->FloatSave.StatusWord &= 0xffffff00;
1930 return EXCEPTION_CONTINUE_EXECUTION;
1931 }
1932 }
1933 return EXCEPTION_CONTINUE_SEARCH;
1934 }
1935 #else //_WIN64
1936 /*
1937 On Windows, the mxcsr control bits are non-volatile across calls
1938 See also CR 6192333
1939 If EXCEPTION_FLT_* happened after some native method modified
1940 mxcsr - it is not a jvm fault.
1941 However should we decide to restore of mxcsr after a faulty
1942 native method we can uncomment following code
1943 jint MxCsr = INITIAL_MXCSR;
1944 // we can't use StubRoutines::addr_mxcsr_std()
1945 // because in Win64 mxcsr is not saved there
1946 if (MxCsr != ctx->MxCsr) {
1947 ctx->MxCsr = MxCsr;
1948 return EXCEPTION_CONTINUE_EXECUTION;
1949 }
1951 */
1952 #endif //_WIN64
1955 // Fatal error reporting is single threaded so we can make this a
1956 // static and preallocated. If it's more than MAX_PATH silently ignore
1957 // it.
1958 static char saved_error_file[MAX_PATH] = {0};
1960 void os::set_error_file(const char *logfile) {
1961 if (strlen(logfile) <= MAX_PATH) {
1962 strncpy(saved_error_file, logfile, MAX_PATH);
1963 }
1964 }
1966 static inline void report_error(Thread* t, DWORD exception_code,
1967 address addr, void* siginfo, void* context) {
1968 VMError err(t, exception_code, addr, siginfo, context);
1969 err.report_and_die();
1971 // If UseOsErrorReporting, this will return here and save the error file
1972 // somewhere where we can find it in the minidump.
1973 }
1975 //-----------------------------------------------------------------------------
1976 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
1977 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
1978 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
1979 #ifdef _M_IA64
1980 address pc = (address) exceptionInfo->ContextRecord->StIIP;
1981 #elif _M_AMD64
1982 address pc = (address) exceptionInfo->ContextRecord->Rip;
1983 #else
1984 address pc = (address) exceptionInfo->ContextRecord->Eip;
1985 #endif
1986 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
1988 #ifndef _WIN64
1989 // Execution protection violation - win32 running on AMD64 only
1990 // Handled first to avoid misdiagnosis as a "normal" access violation;
1991 // This is safe to do because we have a new/unique ExceptionInformation
1992 // code for this condition.
1993 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
1994 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
1995 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
1996 address addr = (address) exceptionRecord->ExceptionInformation[1];
1998 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
1999 int page_size = os::vm_page_size();
2001 // Make sure the pc and the faulting address are sane.
2002 //
2003 // If an instruction spans a page boundary, and the page containing
2004 // the beginning of the instruction is executable but the following
2005 // page is not, the pc and the faulting address might be slightly
2006 // different - we still want to unguard the 2nd page in this case.
2007 //
2008 // 15 bytes seems to be a (very) safe value for max instruction size.
2009 bool pc_is_near_addr =
2010 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2011 bool instr_spans_page_boundary =
2012 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2013 (intptr_t) page_size) > 0);
2015 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2016 static volatile address last_addr =
2017 (address) os::non_memory_address_word();
2019 // In conservative mode, don't unguard unless the address is in the VM
2020 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2021 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2023 // Unguard and retry
2024 address page_start =
2025 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2026 bool res = os::unguard_memory((char*) page_start, page_size);
2028 if (PrintMiscellaneous && Verbose) {
2029 char buf[256];
2030 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2031 "at " INTPTR_FORMAT
2032 ", unguarding " INTPTR_FORMAT ": %s", addr,
2033 page_start, (res ? "success" : strerror(errno)));
2034 tty->print_raw_cr(buf);
2035 }
2037 // Set last_addr so if we fault again at the same address, we don't
2038 // end up in an endless loop.
2039 //
2040 // There are two potential complications here. Two threads trapping
2041 // at the same address at the same time could cause one of the
2042 // threads to think it already unguarded, and abort the VM. Likely
2043 // very rare.
2044 //
2045 // The other race involves two threads alternately trapping at
2046 // different addresses and failing to unguard the page, resulting in
2047 // an endless loop. This condition is probably even more unlikely
2048 // than the first.
2049 //
2050 // Although both cases could be avoided by using locks or thread
2051 // local last_addr, these solutions are unnecessary complication:
2052 // this handler is a best-effort safety net, not a complete solution.
2053 // It is disabled by default and should only be used as a workaround
2054 // in case we missed any no-execute-unsafe VM code.
2056 last_addr = addr;
2058 return EXCEPTION_CONTINUE_EXECUTION;
2059 }
2060 }
2062 // Last unguard failed or not unguarding
2063 tty->print_raw_cr("Execution protection violation");
2064 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2065 exceptionInfo->ContextRecord);
2066 return EXCEPTION_CONTINUE_SEARCH;
2067 }
2068 }
2069 #endif // _WIN64
2071 // Check to see if we caught the safepoint code in the
2072 // process of write protecting the memory serialization page.
2073 // It write enables the page immediately after protecting it
2074 // so just return.
2075 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2076 JavaThread* thread = (JavaThread*) t;
2077 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2078 address addr = (address) exceptionRecord->ExceptionInformation[1];
2079 if ( os::is_memory_serialize_page(thread, addr) ) {
2080 // Block current thread until the memory serialize page permission restored.
2081 os::block_on_serialize_page_trap();
2082 return EXCEPTION_CONTINUE_EXECUTION;
2083 }
2084 }
2087 if (t != NULL && t->is_Java_thread()) {
2088 JavaThread* thread = (JavaThread*) t;
2089 bool in_java = thread->thread_state() == _thread_in_Java;
2091 // Handle potential stack overflows up front.
2092 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2093 if (os::uses_stack_guard_pages()) {
2094 #ifdef _M_IA64
2095 //
2096 // If it's a legal stack address continue, Windows will map it in.
2097 //
2098 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2099 address addr = (address) exceptionRecord->ExceptionInformation[1];
2100 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() )
2101 return EXCEPTION_CONTINUE_EXECUTION;
2103 // The register save area is the same size as the memory stack
2104 // and starts at the page just above the start of the memory stack.
2105 // If we get a fault in this area, we've run out of register
2106 // stack. If we are in java, try throwing a stack overflow exception.
2107 if (addr > thread->stack_base() &&
2108 addr <= (thread->stack_base()+thread->stack_size()) ) {
2109 char buf[256];
2110 jio_snprintf(buf, sizeof(buf),
2111 "Register stack overflow, addr:%p, stack_base:%p\n",
2112 addr, thread->stack_base() );
2113 tty->print_raw_cr(buf);
2114 // If not in java code, return and hope for the best.
2115 return in_java ? Handle_Exception(exceptionInfo,
2116 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2117 : EXCEPTION_CONTINUE_EXECUTION;
2118 }
2119 #endif
2120 if (thread->stack_yellow_zone_enabled()) {
2121 // Yellow zone violation. The o/s has unprotected the first yellow
2122 // zone page for us. Note: must call disable_stack_yellow_zone to
2123 // update the enabled status, even if the zone contains only one page.
2124 thread->disable_stack_yellow_zone();
2125 // If not in java code, return and hope for the best.
2126 return in_java ? Handle_Exception(exceptionInfo,
2127 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2128 : EXCEPTION_CONTINUE_EXECUTION;
2129 } else {
2130 // Fatal red zone violation.
2131 thread->disable_stack_red_zone();
2132 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2133 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2134 exceptionInfo->ContextRecord);
2135 return EXCEPTION_CONTINUE_SEARCH;
2136 }
2137 } else if (in_java) {
2138 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2139 // a one-time-only guard page, which it has released to us. The next
2140 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2141 return Handle_Exception(exceptionInfo,
2142 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2143 } else {
2144 // Can only return and hope for the best. Further stack growth will
2145 // result in an ACCESS_VIOLATION.
2146 return EXCEPTION_CONTINUE_EXECUTION;
2147 }
2148 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2149 // Either stack overflow or null pointer exception.
2150 if (in_java) {
2151 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2152 address addr = (address) exceptionRecord->ExceptionInformation[1];
2153 address stack_end = thread->stack_base() - thread->stack_size();
2154 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2155 // Stack overflow.
2156 assert(!os::uses_stack_guard_pages(),
2157 "should be caught by red zone code above.");
2158 return Handle_Exception(exceptionInfo,
2159 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2160 }
2161 //
2162 // Check for safepoint polling and implicit null
2163 // We only expect null pointers in the stubs (vtable)
2164 // the rest are checked explicitly now.
2165 //
2166 CodeBlob* cb = CodeCache::find_blob(pc);
2167 if (cb != NULL) {
2168 if (os::is_poll_address(addr)) {
2169 address stub = SharedRuntime::get_poll_stub(pc);
2170 return Handle_Exception(exceptionInfo, stub);
2171 }
2172 }
2173 {
2174 #ifdef _WIN64
2175 //
2176 // If it's a legal stack address map the entire region in
2177 //
2178 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2179 address addr = (address) exceptionRecord->ExceptionInformation[1];
2180 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2181 addr = (address)((uintptr_t)addr &
2182 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2183 os::commit_memory( (char *)addr, thread->stack_base() - addr );
2184 return EXCEPTION_CONTINUE_EXECUTION;
2185 }
2186 else
2187 #endif
2188 {
2189 // Null pointer exception.
2190 #ifdef _M_IA64
2191 // We catch register stack overflows in compiled code by doing
2192 // an explicit compare and executing a st8(G0, G0) if the
2193 // BSP enters into our guard area. We test for the overflow
2194 // condition and fall into the normal null pointer exception
2195 // code if BSP hasn't overflowed.
2196 if ( in_java ) {
2197 if(thread->register_stack_overflow()) {
2198 assert((address)exceptionInfo->ContextRecord->IntS3 ==
2199 thread->register_stack_limit(),
2200 "GR7 doesn't contain register_stack_limit");
2201 // Disable the yellow zone which sets the state that
2202 // we've got a stack overflow problem.
2203 if (thread->stack_yellow_zone_enabled()) {
2204 thread->disable_stack_yellow_zone();
2205 }
2206 // Give us some room to process the exception
2207 thread->disable_register_stack_guard();
2208 // Update GR7 with the new limit so we can continue running
2209 // compiled code.
2210 exceptionInfo->ContextRecord->IntS3 =
2211 (ULONGLONG)thread->register_stack_limit();
2212 return Handle_Exception(exceptionInfo,
2213 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2214 } else {
2215 //
2216 // Check for implicit null
2217 // We only expect null pointers in the stubs (vtable)
2218 // the rest are checked explicitly now.
2219 //
2220 if (((uintptr_t)addr) < os::vm_page_size() ) {
2221 // an access to the first page of VM--assume it is a null pointer
2222 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2223 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2224 }
2225 }
2226 } // in_java
2228 // IA64 doesn't use implicit null checking yet. So we shouldn't
2229 // get here.
2230 tty->print_raw_cr("Access violation, possible null pointer exception");
2231 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2232 exceptionInfo->ContextRecord);
2233 return EXCEPTION_CONTINUE_SEARCH;
2234 #else /* !IA64 */
2236 // Windows 98 reports faulting addresses incorrectly
2237 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2238 !os::win32::is_nt()) {
2239 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2240 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2241 }
2242 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2243 exceptionInfo->ContextRecord);
2244 return EXCEPTION_CONTINUE_SEARCH;
2245 #endif
2246 }
2247 }
2248 }
2250 #ifdef _WIN64
2251 // Special care for fast JNI field accessors.
2252 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2253 // in and the heap gets shrunk before the field access.
2254 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2255 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2256 if (addr != (address)-1) {
2257 return Handle_Exception(exceptionInfo, addr);
2258 }
2259 }
2260 #endif
2262 #ifdef _WIN64
2263 // Windows will sometimes generate an access violation
2264 // when we call malloc. Since we use VectoredExceptions
2265 // on 64 bit platforms, we see this exception. We must
2266 // pass this exception on so Windows can recover.
2267 // We check to see if the pc of the fault is in NTDLL.DLL
2268 // if so, we pass control on to Windows for handling.
2269 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH;
2270 #endif
2272 // Stack overflow or null pointer exception in native code.
2273 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2274 exceptionInfo->ContextRecord);
2275 return EXCEPTION_CONTINUE_SEARCH;
2276 }
2278 if (in_java) {
2279 switch (exception_code) {
2280 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2281 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2283 case EXCEPTION_INT_OVERFLOW:
2284 return Handle_IDiv_Exception(exceptionInfo);
2286 } // switch
2287 }
2288 #ifndef _WIN64
2289 if ((thread->thread_state() == _thread_in_Java) ||
2290 (thread->thread_state() == _thread_in_native) )
2291 {
2292 LONG result=Handle_FLT_Exception(exceptionInfo);
2293 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2294 }
2295 #endif //_WIN64
2296 }
2298 if (exception_code != EXCEPTION_BREAKPOINT) {
2299 #ifndef _WIN64
2300 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2301 exceptionInfo->ContextRecord);
2302 #else
2303 // Itanium Windows uses a VectoredExceptionHandler
2304 // Which means that C++ programatic exception handlers (try/except)
2305 // will get here. Continue the search for the right except block if
2306 // the exception code is not a fatal code.
2307 switch ( exception_code ) {
2308 case EXCEPTION_ACCESS_VIOLATION:
2309 case EXCEPTION_STACK_OVERFLOW:
2310 case EXCEPTION_ILLEGAL_INSTRUCTION:
2311 case EXCEPTION_ILLEGAL_INSTRUCTION_2:
2312 case EXCEPTION_INT_OVERFLOW:
2313 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2314 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2315 exceptionInfo->ContextRecord);
2316 }
2317 break;
2318 default:
2319 break;
2320 }
2321 #endif
2322 }
2323 return EXCEPTION_CONTINUE_SEARCH;
2324 }
2326 #ifndef _WIN64
2327 // Special care for fast JNI accessors.
2328 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2329 // the heap gets shrunk before the field access.
2330 // Need to install our own structured exception handler since native code may
2331 // install its own.
2332 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2333 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2334 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2335 address pc = (address) exceptionInfo->ContextRecord->Eip;
2336 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2337 if (addr != (address)-1) {
2338 return Handle_Exception(exceptionInfo, addr);
2339 }
2340 }
2341 return EXCEPTION_CONTINUE_SEARCH;
2342 }
2344 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2345 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2346 __try { \
2347 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2348 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2349 } \
2350 return 0; \
2351 }
2353 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2354 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2355 DEFINE_FAST_GETFIELD(jchar, char, Char)
2356 DEFINE_FAST_GETFIELD(jshort, short, Short)
2357 DEFINE_FAST_GETFIELD(jint, int, Int)
2358 DEFINE_FAST_GETFIELD(jlong, long, Long)
2359 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2360 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2362 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2363 switch (type) {
2364 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2365 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2366 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2367 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2368 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2369 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2370 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2371 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2372 default: ShouldNotReachHere();
2373 }
2374 return (address)-1;
2375 }
2376 #endif
2378 // Virtual Memory
2380 int os::vm_page_size() { return os::win32::vm_page_size(); }
2381 int os::vm_allocation_granularity() {
2382 return os::win32::vm_allocation_granularity();
2383 }
2385 // Windows large page support is available on Windows 2003. In order to use
2386 // large page memory, the administrator must first assign additional privilege
2387 // to the user:
2388 // + select Control Panel -> Administrative Tools -> Local Security Policy
2389 // + select Local Policies -> User Rights Assignment
2390 // + double click "Lock pages in memory", add users and/or groups
2391 // + reboot
2392 // Note the above steps are needed for administrator as well, as administrators
2393 // by default do not have the privilege to lock pages in memory.
2394 //
2395 // Note about Windows 2003: although the API supports committing large page
2396 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2397 // scenario, I found through experiment it only uses large page if the entire
2398 // memory region is reserved and committed in a single VirtualAlloc() call.
2399 // This makes Windows large page support more or less like Solaris ISM, in
2400 // that the entire heap must be committed upfront. This probably will change
2401 // in the future, if so the code below needs to be revisited.
2403 #ifndef MEM_LARGE_PAGES
2404 #define MEM_LARGE_PAGES 0x20000000
2405 #endif
2407 // GetLargePageMinimum is only available on Windows 2003. The other functions
2408 // are available on NT but not on Windows 98/Me. We have to resolve them at
2409 // runtime.
2410 typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void);
2411 typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type)
2412 (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
2413 typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE);
2414 typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID);
2416 static GetLargePageMinimum_func_type _GetLargePageMinimum;
2417 static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges;
2418 static OpenProcessToken_func_type _OpenProcessToken;
2419 static LookupPrivilegeValue_func_type _LookupPrivilegeValue;
2421 static HINSTANCE _kernel32;
2422 static HINSTANCE _advapi32;
2423 static HANDLE _hProcess;
2424 static HANDLE _hToken;
2426 static size_t _large_page_size = 0;
2428 static bool resolve_functions_for_large_page_init() {
2429 _kernel32 = LoadLibrary("kernel32.dll");
2430 if (_kernel32 == NULL) return false;
2432 _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type,
2433 GetProcAddress(_kernel32, "GetLargePageMinimum"));
2434 if (_GetLargePageMinimum == NULL) return false;
2436 _advapi32 = LoadLibrary("advapi32.dll");
2437 if (_advapi32 == NULL) return false;
2439 _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type,
2440 GetProcAddress(_advapi32, "AdjustTokenPrivileges"));
2441 _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type,
2442 GetProcAddress(_advapi32, "OpenProcessToken"));
2443 _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type,
2444 GetProcAddress(_advapi32, "LookupPrivilegeValueA"));
2445 return _AdjustTokenPrivileges != NULL &&
2446 _OpenProcessToken != NULL &&
2447 _LookupPrivilegeValue != NULL;
2448 }
2450 static bool request_lock_memory_privilege() {
2451 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2452 os::current_process_id());
2454 LUID luid;
2455 if (_hProcess != NULL &&
2456 _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2457 _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2459 TOKEN_PRIVILEGES tp;
2460 tp.PrivilegeCount = 1;
2461 tp.Privileges[0].Luid = luid;
2462 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2464 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2465 // privilege. Check GetLastError() too. See MSDN document.
2466 if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2467 (GetLastError() == ERROR_SUCCESS)) {
2468 return true;
2469 }
2470 }
2472 return false;
2473 }
2475 static void cleanup_after_large_page_init() {
2476 _GetLargePageMinimum = NULL;
2477 _AdjustTokenPrivileges = NULL;
2478 _OpenProcessToken = NULL;
2479 _LookupPrivilegeValue = NULL;
2480 if (_kernel32) FreeLibrary(_kernel32);
2481 _kernel32 = NULL;
2482 if (_advapi32) FreeLibrary(_advapi32);
2483 _advapi32 = NULL;
2484 if (_hProcess) CloseHandle(_hProcess);
2485 _hProcess = NULL;
2486 if (_hToken) CloseHandle(_hToken);
2487 _hToken = NULL;
2488 }
2490 bool os::large_page_init() {
2491 if (!UseLargePages) return false;
2493 // print a warning if any large page related flag is specified on command line
2494 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2495 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2496 bool success = false;
2498 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2499 if (resolve_functions_for_large_page_init()) {
2500 if (request_lock_memory_privilege()) {
2501 size_t s = _GetLargePageMinimum();
2502 if (s) {
2503 #if defined(IA32) || defined(AMD64)
2504 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2505 WARN("JVM cannot use large pages bigger than 4mb.");
2506 } else {
2507 #endif
2508 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2509 _large_page_size = LargePageSizeInBytes;
2510 } else {
2511 _large_page_size = s;
2512 }
2513 success = true;
2514 #if defined(IA32) || defined(AMD64)
2515 }
2516 #endif
2517 } else {
2518 WARN("Large page is not supported by the processor.");
2519 }
2520 } else {
2521 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2522 }
2523 } else {
2524 WARN("Large page is not supported by the operating system.");
2525 }
2526 #undef WARN
2528 const size_t default_page_size = (size_t) vm_page_size();
2529 if (success && _large_page_size > default_page_size) {
2530 _page_sizes[0] = _large_page_size;
2531 _page_sizes[1] = default_page_size;
2532 _page_sizes[2] = 0;
2533 }
2535 cleanup_after_large_page_init();
2536 return success;
2537 }
2539 // On win32, one cannot release just a part of reserved memory, it's an
2540 // all or nothing deal. When we split a reservation, we must break the
2541 // reservation into two reservations.
2542 void os::split_reserved_memory(char *base, size_t size, size_t split,
2543 bool realloc) {
2544 if (size > 0) {
2545 release_memory(base, size);
2546 if (realloc) {
2547 reserve_memory(split, base);
2548 }
2549 if (size != split) {
2550 reserve_memory(size - split, base + split);
2551 }
2552 }
2553 }
2555 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
2556 assert((size_t)addr % os::vm_allocation_granularity() == 0,
2557 "reserve alignment");
2558 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
2559 char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE,
2560 PAGE_EXECUTE_READWRITE);
2561 assert(res == NULL || addr == NULL || addr == res,
2562 "Unexpected address from reserve.");
2563 return res;
2564 }
2566 // Reserve memory at an arbitrary address, only if that area is
2567 // available (and not reserved for something else).
2568 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2569 // Windows os::reserve_memory() fails of the requested address range is
2570 // not avilable.
2571 return reserve_memory(bytes, requested_addr);
2572 }
2574 size_t os::large_page_size() {
2575 return _large_page_size;
2576 }
2578 bool os::can_commit_large_page_memory() {
2579 // Windows only uses large page memory when the entire region is reserved
2580 // and committed in a single VirtualAlloc() call. This may change in the
2581 // future, but with Windows 2003 it's not possible to commit on demand.
2582 return false;
2583 }
2585 bool os::can_execute_large_page_memory() {
2586 return true;
2587 }
2589 char* os::reserve_memory_special(size_t bytes) {
2591 if (UseLargePagesIndividualAllocation) {
2592 if (TracePageSizes && Verbose) {
2593 tty->print_cr("Reserving large pages individually.");
2594 }
2595 char * p_buf;
2596 // first reserve enough address space in advance since we want to be
2597 // able to break a single contiguous virtual address range into multiple
2598 // large page commits but WS2003 does not allow reserving large page space
2599 // so we just use 4K pages for reserve, this gives us a legal contiguous
2600 // address space. then we will deallocate that reservation, and re alloc
2601 // using large pages
2602 const size_t size_of_reserve = bytes + _large_page_size;
2603 if (bytes > size_of_reserve) {
2604 // Overflowed.
2605 warning("Individually allocated large pages failed, "
2606 "use -XX:-UseLargePagesIndividualAllocation to turn off");
2607 return NULL;
2608 }
2609 p_buf = (char *) VirtualAlloc(NULL,
2610 size_of_reserve, // size of Reserve
2611 MEM_RESERVE,
2612 PAGE_EXECUTE_READWRITE);
2613 // If reservation failed, return NULL
2614 if (p_buf == NULL) return NULL;
2616 release_memory(p_buf, bytes + _large_page_size);
2617 // round up to page boundary. If the size_of_reserve did not
2618 // overflow and the reservation did not fail, this align up
2619 // should not overflow.
2620 p_buf = (char *) align_size_up((size_t)p_buf, _large_page_size);
2622 // now go through and allocate one page at a time until all bytes are
2623 // allocated
2624 size_t bytes_remaining = align_size_up(bytes, _large_page_size);
2625 // An overflow of align_size_up() would have been caught above
2626 // in the calculation of size_of_reserve.
2627 char * next_alloc_addr = p_buf;
2629 #ifdef ASSERT
2630 // Variable for the failure injection
2631 long ran_num = os::random();
2632 size_t fail_after = ran_num % bytes;
2633 #endif
2635 while (bytes_remaining) {
2636 size_t bytes_to_rq = MIN2(bytes_remaining, _large_page_size);
2637 // Note allocate and commit
2638 char * p_new;
2640 #ifdef ASSERT
2641 bool inject_error = LargePagesIndividualAllocationInjectError &&
2642 (bytes_remaining <= fail_after);
2643 #else
2644 const bool inject_error = false;
2645 #endif
2647 if (inject_error) {
2648 p_new = NULL;
2649 } else {
2650 p_new = (char *) VirtualAlloc(next_alloc_addr,
2651 bytes_to_rq,
2652 MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES,
2653 PAGE_EXECUTE_READWRITE);
2654 }
2656 if (p_new == NULL) {
2657 // Free any allocated pages
2658 if (next_alloc_addr > p_buf) {
2659 // Some memory was committed so release it.
2660 size_t bytes_to_release = bytes - bytes_remaining;
2661 release_memory(p_buf, bytes_to_release);
2662 }
2663 #ifdef ASSERT
2664 if (UseLargePagesIndividualAllocation &&
2665 LargePagesIndividualAllocationInjectError) {
2666 if (TracePageSizes && Verbose) {
2667 tty->print_cr("Reserving large pages individually failed.");
2668 }
2669 }
2670 #endif
2671 return NULL;
2672 }
2673 bytes_remaining -= bytes_to_rq;
2674 next_alloc_addr += bytes_to_rq;
2675 }
2677 return p_buf;
2679 } else {
2680 // normal policy just allocate it all at once
2681 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
2682 char * res = (char *)VirtualAlloc(NULL,
2683 bytes,
2684 flag,
2685 PAGE_EXECUTE_READWRITE);
2686 return res;
2687 }
2688 }
2690 bool os::release_memory_special(char* base, size_t bytes) {
2691 return release_memory(base, bytes);
2692 }
2694 void os::print_statistics() {
2695 }
2697 bool os::commit_memory(char* addr, size_t bytes) {
2698 if (bytes == 0) {
2699 // Don't bother the OS with noops.
2700 return true;
2701 }
2702 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
2703 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
2704 // Don't attempt to print anything if the OS call fails. We're
2705 // probably low on resources, so the print itself may cause crashes.
2706 return VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_EXECUTE_READWRITE) != NULL;
2707 }
2709 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint) {
2710 return commit_memory(addr, size);
2711 }
2713 bool os::uncommit_memory(char* addr, size_t bytes) {
2714 if (bytes == 0) {
2715 // Don't bother the OS with noops.
2716 return true;
2717 }
2718 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
2719 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
2720 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0;
2721 }
2723 bool os::release_memory(char* addr, size_t bytes) {
2724 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
2725 }
2727 // Set protections specified
2728 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2729 bool is_committed) {
2730 unsigned int p = 0;
2731 switch (prot) {
2732 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
2733 case MEM_PROT_READ: p = PAGE_READONLY; break;
2734 case MEM_PROT_RW: p = PAGE_READWRITE; break;
2735 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
2736 default:
2737 ShouldNotReachHere();
2738 }
2740 DWORD old_status;
2742 // Strange enough, but on Win32 one can change protection only for committed
2743 // memory, not a big deal anyway, as bytes less or equal than 64K
2744 if (!is_committed && !commit_memory(addr, bytes)) {
2745 fatal("cannot commit protection page");
2746 }
2747 // One cannot use os::guard_memory() here, as on Win32 guard page
2748 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
2749 //
2750 // Pages in the region become guard pages. Any attempt to access a guard page
2751 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
2752 // the guard page status. Guard pages thus act as a one-time access alarm.
2753 return VirtualProtect(addr, bytes, p, &old_status) != 0;
2754 }
2756 bool os::guard_memory(char* addr, size_t bytes) {
2757 DWORD old_status;
2758 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE | PAGE_GUARD, &old_status) != 0;
2759 }
2761 bool os::unguard_memory(char* addr, size_t bytes) {
2762 DWORD old_status;
2763 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &old_status) != 0;
2764 }
2766 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
2767 void os::free_memory(char *addr, size_t bytes) { }
2768 void os::numa_make_global(char *addr, size_t bytes) { }
2769 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
2770 bool os::numa_topology_changed() { return false; }
2771 size_t os::numa_get_groups_num() { return 1; }
2772 int os::numa_get_group_id() { return 0; }
2773 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2774 if (size > 0) {
2775 ids[0] = 0;
2776 return 1;
2777 }
2778 return 0;
2779 }
2781 bool os::get_page_info(char *start, page_info* info) {
2782 return false;
2783 }
2785 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2786 return end;
2787 }
2789 char* os::non_memory_address_word() {
2790 // Must never look like an address returned by reserve_memory,
2791 // even in its subfields (as defined by the CPU immediate fields,
2792 // if the CPU splits constants across multiple instructions).
2793 return (char*)-1;
2794 }
2796 #define MAX_ERROR_COUNT 100
2797 #define SYS_THREAD_ERROR 0xffffffffUL
2799 void os::pd_start_thread(Thread* thread) {
2800 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
2801 // Returns previous suspend state:
2802 // 0: Thread was not suspended
2803 // 1: Thread is running now
2804 // >1: Thread is still suspended.
2805 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
2806 }
2808 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2809 return ::read(fd, buf, nBytes);
2810 }
2812 class HighResolutionInterval {
2813 // The default timer resolution seems to be 10 milliseconds.
2814 // (Where is this written down?)
2815 // If someone wants to sleep for only a fraction of the default,
2816 // then we set the timer resolution down to 1 millisecond for
2817 // the duration of their interval.
2818 // We carefully set the resolution back, since otherwise we
2819 // seem to incur an overhead (3%?) that we don't need.
2820 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
2821 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
2822 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
2823 // timeBeginPeriod() if the relative error exceeded some threshold.
2824 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
2825 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
2826 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
2827 // resolution timers running.
2828 private:
2829 jlong resolution;
2830 public:
2831 HighResolutionInterval(jlong ms) {
2832 resolution = ms % 10L;
2833 if (resolution != 0) {
2834 MMRESULT result = timeBeginPeriod(1L);
2835 }
2836 }
2837 ~HighResolutionInterval() {
2838 if (resolution != 0) {
2839 MMRESULT result = timeEndPeriod(1L);
2840 }
2841 resolution = 0L;
2842 }
2843 };
2845 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
2846 jlong limit = (jlong) MAXDWORD;
2848 while(ms > limit) {
2849 int res;
2850 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
2851 return res;
2852 ms -= limit;
2853 }
2855 assert(thread == Thread::current(), "thread consistency check");
2856 OSThread* osthread = thread->osthread();
2857 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
2858 int result;
2859 if (interruptable) {
2860 assert(thread->is_Java_thread(), "must be java thread");
2861 JavaThread *jt = (JavaThread *) thread;
2862 ThreadBlockInVM tbivm(jt);
2864 jt->set_suspend_equivalent();
2865 // cleared by handle_special_suspend_equivalent_condition() or
2866 // java_suspend_self() via check_and_wait_while_suspended()
2868 HANDLE events[1];
2869 events[0] = osthread->interrupt_event();
2870 HighResolutionInterval *phri=NULL;
2871 if(!ForceTimeHighResolution)
2872 phri = new HighResolutionInterval( ms );
2873 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
2874 result = OS_TIMEOUT;
2875 } else {
2876 ResetEvent(osthread->interrupt_event());
2877 osthread->set_interrupted(false);
2878 result = OS_INTRPT;
2879 }
2880 delete phri; //if it is NULL, harmless
2882 // were we externally suspended while we were waiting?
2883 jt->check_and_wait_while_suspended();
2884 } else {
2885 assert(!thread->is_Java_thread(), "must not be java thread");
2886 Sleep((long) ms);
2887 result = OS_TIMEOUT;
2888 }
2889 return result;
2890 }
2892 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2893 void os::infinite_sleep() {
2894 while (true) { // sleep forever ...
2895 Sleep(100000); // ... 100 seconds at a time
2896 }
2897 }
2899 typedef BOOL (WINAPI * STTSignature)(void) ;
2901 os::YieldResult os::NakedYield() {
2902 // Use either SwitchToThread() or Sleep(0)
2903 // Consider passing back the return value from SwitchToThread().
2904 // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread.
2905 // In that case we revert to Sleep(0).
2906 static volatile STTSignature stt = (STTSignature) 1 ;
2908 if (stt == ((STTSignature) 1)) {
2909 stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ;
2910 // It's OK if threads race during initialization as the operation above is idempotent.
2911 }
2912 if (stt != NULL) {
2913 return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
2914 } else {
2915 Sleep (0) ;
2916 }
2917 return os::YIELD_UNKNOWN ;
2918 }
2920 void os::yield() { os::NakedYield(); }
2922 void os::yield_all(int attempts) {
2923 // Yields to all threads, including threads with lower priorities
2924 Sleep(1);
2925 }
2927 // Win32 only gives you access to seven real priorities at a time,
2928 // so we compress Java's ten down to seven. It would be better
2929 // if we dynamically adjusted relative priorities.
2931 int os::java_to_os_priority[MaxPriority + 1] = {
2932 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
2933 THREAD_PRIORITY_LOWEST, // 1 MinPriority
2934 THREAD_PRIORITY_LOWEST, // 2
2935 THREAD_PRIORITY_BELOW_NORMAL, // 3
2936 THREAD_PRIORITY_BELOW_NORMAL, // 4
2937 THREAD_PRIORITY_NORMAL, // 5 NormPriority
2938 THREAD_PRIORITY_NORMAL, // 6
2939 THREAD_PRIORITY_ABOVE_NORMAL, // 7
2940 THREAD_PRIORITY_ABOVE_NORMAL, // 8
2941 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
2942 THREAD_PRIORITY_HIGHEST // 10 MaxPriority
2943 };
2945 int prio_policy1[MaxPriority + 1] = {
2946 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
2947 THREAD_PRIORITY_LOWEST, // 1 MinPriority
2948 THREAD_PRIORITY_LOWEST, // 2
2949 THREAD_PRIORITY_BELOW_NORMAL, // 3
2950 THREAD_PRIORITY_BELOW_NORMAL, // 4
2951 THREAD_PRIORITY_NORMAL, // 5 NormPriority
2952 THREAD_PRIORITY_ABOVE_NORMAL, // 6
2953 THREAD_PRIORITY_ABOVE_NORMAL, // 7
2954 THREAD_PRIORITY_HIGHEST, // 8
2955 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
2956 THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority
2957 };
2959 static int prio_init() {
2960 // If ThreadPriorityPolicy is 1, switch tables
2961 if (ThreadPriorityPolicy == 1) {
2962 int i;
2963 for (i = 0; i < MaxPriority + 1; i++) {
2964 os::java_to_os_priority[i] = prio_policy1[i];
2965 }
2966 }
2967 return 0;
2968 }
2970 OSReturn os::set_native_priority(Thread* thread, int priority) {
2971 if (!UseThreadPriorities) return OS_OK;
2972 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
2973 return ret ? OS_OK : OS_ERR;
2974 }
2976 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
2977 if ( !UseThreadPriorities ) {
2978 *priority_ptr = java_to_os_priority[NormPriority];
2979 return OS_OK;
2980 }
2981 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
2982 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
2983 assert(false, "GetThreadPriority failed");
2984 return OS_ERR;
2985 }
2986 *priority_ptr = os_prio;
2987 return OS_OK;
2988 }
2991 // Hint to the underlying OS that a task switch would not be good.
2992 // Void return because it's a hint and can fail.
2993 void os::hint_no_preempt() {}
2995 void os::interrupt(Thread* thread) {
2996 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
2997 "possibility of dangling Thread pointer");
2999 OSThread* osthread = thread->osthread();
3000 osthread->set_interrupted(true);
3001 // More than one thread can get here with the same value of osthread,
3002 // resulting in multiple notifications. We do, however, want the store
3003 // to interrupted() to be visible to other threads before we post
3004 // the interrupt event.
3005 OrderAccess::release();
3006 SetEvent(osthread->interrupt_event());
3007 // For JSR166: unpark after setting status
3008 if (thread->is_Java_thread())
3009 ((JavaThread*)thread)->parker()->unpark();
3011 ParkEvent * ev = thread->_ParkEvent ;
3012 if (ev != NULL) ev->unpark() ;
3014 }
3017 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3018 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3019 "possibility of dangling Thread pointer");
3021 OSThread* osthread = thread->osthread();
3022 bool interrupted;
3023 interrupted = osthread->interrupted();
3024 if (clear_interrupted == true) {
3025 osthread->set_interrupted(false);
3026 ResetEvent(osthread->interrupt_event());
3027 } // Otherwise leave the interrupted state alone
3029 return interrupted;
3030 }
3032 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3033 ExtendedPC os::get_thread_pc(Thread* thread) {
3034 CONTEXT context;
3035 context.ContextFlags = CONTEXT_CONTROL;
3036 HANDLE handle = thread->osthread()->thread_handle();
3037 #ifdef _M_IA64
3038 assert(0, "Fix get_thread_pc");
3039 return ExtendedPC(NULL);
3040 #else
3041 if (GetThreadContext(handle, &context)) {
3042 #ifdef _M_AMD64
3043 return ExtendedPC((address) context.Rip);
3044 #else
3045 return ExtendedPC((address) context.Eip);
3046 #endif
3047 } else {
3048 return ExtendedPC(NULL);
3049 }
3050 #endif
3051 }
3053 // GetCurrentThreadId() returns DWORD
3054 intx os::current_thread_id() { return GetCurrentThreadId(); }
3056 static int _initial_pid = 0;
3058 int os::current_process_id()
3059 {
3060 return (_initial_pid ? _initial_pid : _getpid());
3061 }
3063 int os::win32::_vm_page_size = 0;
3064 int os::win32::_vm_allocation_granularity = 0;
3065 int os::win32::_processor_type = 0;
3066 // Processor level is not available on non-NT systems, use vm_version instead
3067 int os::win32::_processor_level = 0;
3068 julong os::win32::_physical_memory = 0;
3069 size_t os::win32::_default_stack_size = 0;
3071 intx os::win32::_os_thread_limit = 0;
3072 volatile intx os::win32::_os_thread_count = 0;
3074 bool os::win32::_is_nt = false;
3075 bool os::win32::_is_windows_2003 = false;
3078 void os::win32::initialize_system_info() {
3079 SYSTEM_INFO si;
3080 GetSystemInfo(&si);
3081 _vm_page_size = si.dwPageSize;
3082 _vm_allocation_granularity = si.dwAllocationGranularity;
3083 _processor_type = si.dwProcessorType;
3084 _processor_level = si.wProcessorLevel;
3085 _processor_count = si.dwNumberOfProcessors;
3087 MEMORYSTATUS ms;
3088 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3089 // dwMemoryLoad (% of memory in use)
3090 GlobalMemoryStatus(&ms);
3091 _physical_memory = ms.dwTotalPhys;
3093 OSVERSIONINFO oi;
3094 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
3095 GetVersionEx(&oi);
3096 switch(oi.dwPlatformId) {
3097 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3098 case VER_PLATFORM_WIN32_NT:
3099 _is_nt = true;
3100 {
3101 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3102 if (os_vers == 5002) {
3103 _is_windows_2003 = true;
3104 }
3105 }
3106 break;
3107 default: fatal("Unknown platform");
3108 }
3110 _default_stack_size = os::current_stack_size();
3111 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3112 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3113 "stack size not a multiple of page size");
3115 initialize_performance_counter();
3117 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3118 // known to deadlock the system, if the VM issues to thread operations with
3119 // a too high frequency, e.g., such as changing the priorities.
3120 // The 6000 seems to work well - no deadlocks has been notices on the test
3121 // programs that we have seen experience this problem.
3122 if (!os::win32::is_nt()) {
3123 StarvationMonitorInterval = 6000;
3124 }
3125 }
3128 void os::win32::setmode_streams() {
3129 _setmode(_fileno(stdin), _O_BINARY);
3130 _setmode(_fileno(stdout), _O_BINARY);
3131 _setmode(_fileno(stderr), _O_BINARY);
3132 }
3135 int os::message_box(const char* title, const char* message) {
3136 int result = MessageBox(NULL, message, title,
3137 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3138 return result == IDYES;
3139 }
3141 int os::allocate_thread_local_storage() {
3142 return TlsAlloc();
3143 }
3146 void os::free_thread_local_storage(int index) {
3147 TlsFree(index);
3148 }
3151 void os::thread_local_storage_at_put(int index, void* value) {
3152 TlsSetValue(index, value);
3153 assert(thread_local_storage_at(index) == value, "Just checking");
3154 }
3157 void* os::thread_local_storage_at(int index) {
3158 return TlsGetValue(index);
3159 }
3162 #ifndef PRODUCT
3163 #ifndef _WIN64
3164 // Helpers to check whether NX protection is enabled
3165 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3166 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3167 pex->ExceptionRecord->NumberParameters > 0 &&
3168 pex->ExceptionRecord->ExceptionInformation[0] ==
3169 EXCEPTION_INFO_EXEC_VIOLATION) {
3170 return EXCEPTION_EXECUTE_HANDLER;
3171 }
3172 return EXCEPTION_CONTINUE_SEARCH;
3173 }
3175 void nx_check_protection() {
3176 // If NX is enabled we'll get an exception calling into code on the stack
3177 char code[] = { (char)0xC3 }; // ret
3178 void *code_ptr = (void *)code;
3179 __try {
3180 __asm call code_ptr
3181 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3182 tty->print_raw_cr("NX protection detected.");
3183 }
3184 }
3185 #endif // _WIN64
3186 #endif // PRODUCT
3188 // this is called _before_ the global arguments have been parsed
3189 void os::init(void) {
3190 _initial_pid = _getpid();
3192 init_random(1234567);
3194 win32::initialize_system_info();
3195 win32::setmode_streams();
3196 init_page_sizes((size_t) win32::vm_page_size());
3198 // For better scalability on MP systems (must be called after initialize_system_info)
3199 #ifndef PRODUCT
3200 if (is_MP()) {
3201 NoYieldsInMicrolock = true;
3202 }
3203 #endif
3204 // This may be overridden later when argument processing is done.
3205 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3206 os::win32::is_windows_2003());
3208 // Initialize main_process and main_thread
3209 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3210 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3211 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3212 fatal("DuplicateHandle failed\n");
3213 }
3214 main_thread_id = (int) GetCurrentThreadId();
3215 }
3217 // To install functions for atexit processing
3218 extern "C" {
3219 static void perfMemory_exit_helper() {
3220 perfMemory_exit();
3221 }
3222 }
3225 // this is called _after_ the global arguments have been parsed
3226 jint os::init_2(void) {
3227 // Allocate a single page and mark it as readable for safepoint polling
3228 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3229 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3231 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3232 guarantee( return_page != NULL, "Commit Failed for polling page");
3234 os::set_polling_page( polling_page );
3236 #ifndef PRODUCT
3237 if( Verbose && PrintMiscellaneous )
3238 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3239 #endif
3241 if (!UseMembar) {
3242 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_EXECUTE_READWRITE);
3243 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3245 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_EXECUTE_READWRITE);
3246 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3248 os::set_memory_serialize_page( mem_serialize_page );
3250 #ifndef PRODUCT
3251 if(Verbose && PrintMiscellaneous)
3252 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3253 #endif
3254 }
3256 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init());
3258 // Setup Windows Exceptions
3260 // On Itanium systems, Structured Exception Handling does not
3261 // work since stack frames must be walkable by the OS. Since
3262 // much of our code is dynamically generated, and we do not have
3263 // proper unwind .xdata sections, the system simply exits
3264 // rather than delivering the exception. To work around
3265 // this we use VectorExceptions instead.
3266 #ifdef _WIN64
3267 if (UseVectoredExceptions) {
3268 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter);
3269 }
3270 #endif
3272 // for debugging float code generation bugs
3273 if (ForceFloatExceptions) {
3274 #ifndef _WIN64
3275 static long fp_control_word = 0;
3276 __asm { fstcw fp_control_word }
3277 // see Intel PPro Manual, Vol. 2, p 7-16
3278 const long precision = 0x20;
3279 const long underflow = 0x10;
3280 const long overflow = 0x08;
3281 const long zero_div = 0x04;
3282 const long denorm = 0x02;
3283 const long invalid = 0x01;
3284 fp_control_word |= invalid;
3285 __asm { fldcw fp_control_word }
3286 #endif
3287 }
3289 // Initialize HPI.
3290 jint hpi_result = hpi::initialize();
3291 if (hpi_result != JNI_OK) { return hpi_result; }
3293 // If stack_commit_size is 0, windows will reserve the default size,
3294 // but only commit a small portion of it.
3295 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3296 size_t default_reserve_size = os::win32::default_stack_size();
3297 size_t actual_reserve_size = stack_commit_size;
3298 if (stack_commit_size < default_reserve_size) {
3299 // If stack_commit_size == 0, we want this too
3300 actual_reserve_size = default_reserve_size;
3301 }
3303 JavaThread::set_stack_size_at_create(stack_commit_size);
3305 // Calculate theoretical max. size of Threads to guard gainst artifical
3306 // out-of-memory situations, where all available address-space has been
3307 // reserved by thread stacks.
3308 assert(actual_reserve_size != 0, "Must have a stack");
3310 // Calculate the thread limit when we should start doing Virtual Memory
3311 // banging. Currently when the threads will have used all but 200Mb of space.
3312 //
3313 // TODO: consider performing a similar calculation for commit size instead
3314 // as reserve size, since on a 64-bit platform we'll run into that more
3315 // often than running out of virtual memory space. We can use the
3316 // lower value of the two calculations as the os_thread_limit.
3317 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3318 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3320 // at exit methods are called in the reverse order of their registration.
3321 // there is no limit to the number of functions registered. atexit does
3322 // not set errno.
3324 if (PerfAllowAtExitRegistration) {
3325 // only register atexit functions if PerfAllowAtExitRegistration is set.
3326 // atexit functions can be delayed until process exit time, which
3327 // can be problematic for embedded VM situations. Embedded VMs should
3328 // call DestroyJavaVM() to assure that VM resources are released.
3330 // note: perfMemory_exit_helper atexit function may be removed in
3331 // the future if the appropriate cleanup code can be added to the
3332 // VM_Exit VMOperation's doit method.
3333 if (atexit(perfMemory_exit_helper) != 0) {
3334 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3335 }
3336 }
3338 // initialize PSAPI or ToolHelp for fatal error handler
3339 if (win32::is_nt()) _init_psapi();
3340 else _init_toolhelp();
3342 #ifndef _WIN64
3343 // Print something if NX is enabled (win32 on AMD64)
3344 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
3345 #endif
3347 // initialize thread priority policy
3348 prio_init();
3350 return JNI_OK;
3351 }
3354 // Mark the polling page as unreadable
3355 void os::make_polling_page_unreadable(void) {
3356 DWORD old_status;
3357 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
3358 fatal("Could not disable polling page");
3359 };
3361 // Mark the polling page as readable
3362 void os::make_polling_page_readable(void) {
3363 DWORD old_status;
3364 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
3365 fatal("Could not enable polling page");
3366 };
3369 int os::stat(const char *path, struct stat *sbuf) {
3370 char pathbuf[MAX_PATH];
3371 if (strlen(path) > MAX_PATH - 1) {
3372 errno = ENAMETOOLONG;
3373 return -1;
3374 }
3375 hpi::native_path(strcpy(pathbuf, path));
3376 int ret = ::stat(pathbuf, sbuf);
3377 if (sbuf != NULL && UseUTCFileTimestamp) {
3378 // Fix for 6539723. st_mtime returned from stat() is dependent on
3379 // the system timezone and so can return different values for the
3380 // same file if/when daylight savings time changes. This adjustment
3381 // makes sure the same timestamp is returned regardless of the TZ.
3382 //
3383 // See:
3384 // http://msdn.microsoft.com/library/
3385 // default.asp?url=/library/en-us/sysinfo/base/
3386 // time_zone_information_str.asp
3387 // and
3388 // http://msdn.microsoft.com/library/default.asp?url=
3389 // /library/en-us/sysinfo/base/settimezoneinformation.asp
3390 //
3391 // NOTE: there is a insidious bug here: If the timezone is changed
3392 // after the call to stat() but before 'GetTimeZoneInformation()', then
3393 // the adjustment we do here will be wrong and we'll return the wrong
3394 // value (which will likely end up creating an invalid class data
3395 // archive). Absent a better API for this, or some time zone locking
3396 // mechanism, we'll have to live with this risk.
3397 TIME_ZONE_INFORMATION tz;
3398 DWORD tzid = GetTimeZoneInformation(&tz);
3399 int daylightBias =
3400 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
3401 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
3402 }
3403 return ret;
3404 }
3407 #define FT2INT64(ft) \
3408 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
3411 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3412 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3413 // of a thread.
3414 //
3415 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3416 // the fast estimate available on the platform.
3418 // current_thread_cpu_time() is not optimized for Windows yet
3419 jlong os::current_thread_cpu_time() {
3420 // return user + sys since the cost is the same
3421 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
3422 }
3424 jlong os::thread_cpu_time(Thread* thread) {
3425 // consistent with what current_thread_cpu_time() returns.
3426 return os::thread_cpu_time(thread, true /* user+sys */);
3427 }
3429 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3430 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3431 }
3433 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
3434 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
3435 // If this function changes, os::is_thread_cpu_time_supported() should too
3436 if (os::win32::is_nt()) {
3437 FILETIME CreationTime;
3438 FILETIME ExitTime;
3439 FILETIME KernelTime;
3440 FILETIME UserTime;
3442 if ( GetThreadTimes(thread->osthread()->thread_handle(),
3443 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3444 return -1;
3445 else
3446 if (user_sys_cpu_time) {
3447 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
3448 } else {
3449 return FT2INT64(UserTime) * 100;
3450 }
3451 } else {
3452 return (jlong) timeGetTime() * 1000000;
3453 }
3454 }
3456 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3457 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3458 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3459 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3460 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3461 }
3463 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3464 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3465 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3466 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3467 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3468 }
3470 bool os::is_thread_cpu_time_supported() {
3471 // see os::thread_cpu_time
3472 if (os::win32::is_nt()) {
3473 FILETIME CreationTime;
3474 FILETIME ExitTime;
3475 FILETIME KernelTime;
3476 FILETIME UserTime;
3478 if ( GetThreadTimes(GetCurrentThread(),
3479 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3480 return false;
3481 else
3482 return true;
3483 } else {
3484 return false;
3485 }
3486 }
3488 // Windows does't provide a loadavg primitive so this is stubbed out for now.
3489 // It does have primitives (PDH API) to get CPU usage and run queue length.
3490 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
3491 // If we wanted to implement loadavg on Windows, we have a few options:
3492 //
3493 // a) Query CPU usage and run queue length and "fake" an answer by
3494 // returning the CPU usage if it's under 100%, and the run queue
3495 // length otherwise. It turns out that querying is pretty slow
3496 // on Windows, on the order of 200 microseconds on a fast machine.
3497 // Note that on the Windows the CPU usage value is the % usage
3498 // since the last time the API was called (and the first call
3499 // returns 100%), so we'd have to deal with that as well.
3500 //
3501 // b) Sample the "fake" answer using a sampling thread and store
3502 // the answer in a global variable. The call to loadavg would
3503 // just return the value of the global, avoiding the slow query.
3504 //
3505 // c) Sample a better answer using exponential decay to smooth the
3506 // value. This is basically the algorithm used by UNIX kernels.
3507 //
3508 // Note that sampling thread starvation could affect both (b) and (c).
3509 int os::loadavg(double loadavg[], int nelem) {
3510 return -1;
3511 }
3514 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
3515 bool os::dont_yield() {
3516 return DontYieldALot;
3517 }
3519 // Is a (classpath) directory empty?
3520 bool os::dir_is_empty(const char* path) {
3521 WIN32_FIND_DATA fd;
3522 HANDLE f = FindFirstFile(path, &fd);
3523 if (f == INVALID_HANDLE_VALUE) {
3524 return true;
3525 }
3526 FindClose(f);
3527 return false;
3528 }
3530 // create binary file, rewriting existing file if required
3531 int os::create_binary_file(const char* path, bool rewrite_existing) {
3532 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
3533 if (!rewrite_existing) {
3534 oflags |= _O_EXCL;
3535 }
3536 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
3537 }
3539 // return current position of file pointer
3540 jlong os::current_file_offset(int fd) {
3541 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
3542 }
3544 // move file pointer to the specified offset
3545 jlong os::seek_to_file_offset(int fd, jlong offset) {
3546 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
3547 }
3550 // Map a block of memory.
3551 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
3552 char *addr, size_t bytes, bool read_only,
3553 bool allow_exec) {
3554 HANDLE hFile;
3555 char* base;
3557 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
3558 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
3559 if (hFile == NULL) {
3560 if (PrintMiscellaneous && Verbose) {
3561 DWORD err = GetLastError();
3562 tty->print_cr("CreateFile() failed: GetLastError->%ld.");
3563 }
3564 return NULL;
3565 }
3567 if (allow_exec) {
3568 // CreateFileMapping/MapViewOfFileEx can't map executable memory
3569 // unless it comes from a PE image (which the shared archive is not.)
3570 // Even VirtualProtect refuses to give execute access to mapped memory
3571 // that was not previously executable.
3572 //
3573 // Instead, stick the executable region in anonymous memory. Yuck.
3574 // Penalty is that ~4 pages will not be shareable - in the future
3575 // we might consider DLLizing the shared archive with a proper PE
3576 // header so that mapping executable + sharing is possible.
3578 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
3579 PAGE_READWRITE);
3580 if (base == NULL) {
3581 if (PrintMiscellaneous && Verbose) {
3582 DWORD err = GetLastError();
3583 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
3584 }
3585 CloseHandle(hFile);
3586 return NULL;
3587 }
3589 DWORD bytes_read;
3590 OVERLAPPED overlapped;
3591 overlapped.Offset = (DWORD)file_offset;
3592 overlapped.OffsetHigh = 0;
3593 overlapped.hEvent = NULL;
3594 // ReadFile guarantees that if the return value is true, the requested
3595 // number of bytes were read before returning.
3596 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
3597 if (!res) {
3598 if (PrintMiscellaneous && Verbose) {
3599 DWORD err = GetLastError();
3600 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
3601 }
3602 release_memory(base, bytes);
3603 CloseHandle(hFile);
3604 return NULL;
3605 }
3606 } else {
3607 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
3608 NULL /*file_name*/);
3609 if (hMap == NULL) {
3610 if (PrintMiscellaneous && Verbose) {
3611 DWORD err = GetLastError();
3612 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.");
3613 }
3614 CloseHandle(hFile);
3615 return NULL;
3616 }
3618 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
3619 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
3620 (DWORD)bytes, addr);
3621 if (base == NULL) {
3622 if (PrintMiscellaneous && Verbose) {
3623 DWORD err = GetLastError();
3624 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
3625 }
3626 CloseHandle(hMap);
3627 CloseHandle(hFile);
3628 return NULL;
3629 }
3631 if (CloseHandle(hMap) == 0) {
3632 if (PrintMiscellaneous && Verbose) {
3633 DWORD err = GetLastError();
3634 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
3635 }
3636 CloseHandle(hFile);
3637 return base;
3638 }
3639 }
3641 if (allow_exec) {
3642 DWORD old_protect;
3643 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
3644 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
3646 if (!res) {
3647 if (PrintMiscellaneous && Verbose) {
3648 DWORD err = GetLastError();
3649 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
3650 }
3651 // Don't consider this a hard error, on IA32 even if the
3652 // VirtualProtect fails, we should still be able to execute
3653 CloseHandle(hFile);
3654 return base;
3655 }
3656 }
3658 if (CloseHandle(hFile) == 0) {
3659 if (PrintMiscellaneous && Verbose) {
3660 DWORD err = GetLastError();
3661 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
3662 }
3663 return base;
3664 }
3666 return base;
3667 }
3670 // Remap a block of memory.
3671 char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
3672 char *addr, size_t bytes, bool read_only,
3673 bool allow_exec) {
3674 // This OS does not allow existing memory maps to be remapped so we
3675 // have to unmap the memory before we remap it.
3676 if (!os::unmap_memory(addr, bytes)) {
3677 return NULL;
3678 }
3680 // There is a very small theoretical window between the unmap_memory()
3681 // call above and the map_memory() call below where a thread in native
3682 // code may be able to access an address that is no longer mapped.
3684 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3685 allow_exec);
3686 }
3689 // Unmap a block of memory.
3690 // Returns true=success, otherwise false.
3692 bool os::unmap_memory(char* addr, size_t bytes) {
3693 BOOL result = UnmapViewOfFile(addr);
3694 if (result == 0) {
3695 if (PrintMiscellaneous && Verbose) {
3696 DWORD err = GetLastError();
3697 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
3698 }
3699 return false;
3700 }
3701 return true;
3702 }
3704 void os::pause() {
3705 char filename[MAX_PATH];
3706 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3707 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
3708 } else {
3709 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3710 }
3712 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3713 if (fd != -1) {
3714 struct stat buf;
3715 close(fd);
3716 while (::stat(filename, &buf) == 0) {
3717 Sleep(100);
3718 }
3719 } else {
3720 jio_fprintf(stderr,
3721 "Could not open pause file '%s', continuing immediately.\n", filename);
3722 }
3723 }
3725 // An Event wraps a win32 "CreateEvent" kernel handle.
3726 //
3727 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
3728 //
3729 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
3730 // field, and call CloseHandle() on the win32 event handle. Unpark() would
3731 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
3732 // In addition, an unpark() operation might fetch the handle field, but the
3733 // event could recycle between the fetch and the SetEvent() operation.
3734 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
3735 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
3736 // on an stale but recycled handle would be harmless, but in practice this might
3737 // confuse other non-Sun code, so it's not a viable approach.
3738 //
3739 // 2: Once a win32 event handle is associated with an Event, it remains associated
3740 // with the Event. The event handle is never closed. This could be construed
3741 // as handle leakage, but only up to the maximum # of threads that have been extant
3742 // at any one time. This shouldn't be an issue, as windows platforms typically
3743 // permit a process to have hundreds of thousands of open handles.
3744 //
3745 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
3746 // and release unused handles.
3747 //
3748 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
3749 // It's not clear, however, that we wouldn't be trading one type of leak for another.
3750 //
3751 // 5. Use an RCU-like mechanism (Read-Copy Update).
3752 // Or perhaps something similar to Maged Michael's "Hazard pointers".
3753 //
3754 // We use (2).
3755 //
3756 // TODO-FIXME:
3757 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
3758 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
3759 // to recover from (or at least detect) the dreaded Windows 841176 bug.
3760 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
3761 // into a single win32 CreateEvent() handle.
3762 //
3763 // _Event transitions in park()
3764 // -1 => -1 : illegal
3765 // 1 => 0 : pass - return immediately
3766 // 0 => -1 : block
3767 //
3768 // _Event serves as a restricted-range semaphore :
3769 // -1 : thread is blocked
3770 // 0 : neutral - thread is running or ready
3771 // 1 : signaled - thread is running or ready
3772 //
3773 // Another possible encoding of _Event would be
3774 // with explicit "PARKED" and "SIGNALED" bits.
3776 int os::PlatformEvent::park (jlong Millis) {
3777 guarantee (_ParkHandle != NULL , "Invariant") ;
3778 guarantee (Millis > 0 , "Invariant") ;
3779 int v ;
3781 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
3782 // the initial park() operation.
3784 for (;;) {
3785 v = _Event ;
3786 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
3787 }
3788 guarantee ((v == 0) || (v == 1), "invariant") ;
3789 if (v != 0) return OS_OK ;
3791 // Do this the hard way by blocking ...
3792 // TODO: consider a brief spin here, gated on the success of recent
3793 // spin attempts by this thread.
3794 //
3795 // We decompose long timeouts into series of shorter timed waits.
3796 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
3797 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
3798 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
3799 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
3800 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
3801 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
3802 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
3803 // for the already waited time. This policy does not admit any new outcomes.
3804 // In the future, however, we might want to track the accumulated wait time and
3805 // adjust Millis accordingly if we encounter a spurious wakeup.
3807 const int MAXTIMEOUT = 0x10000000 ;
3808 DWORD rv = WAIT_TIMEOUT ;
3809 while (_Event < 0 && Millis > 0) {
3810 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
3811 if (Millis > MAXTIMEOUT) {
3812 prd = MAXTIMEOUT ;
3813 }
3814 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
3815 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
3816 if (rv == WAIT_TIMEOUT) {
3817 Millis -= prd ;
3818 }
3819 }
3820 v = _Event ;
3821 _Event = 0 ;
3822 OrderAccess::fence() ;
3823 // If we encounter a nearly simultanous timeout expiry and unpark()
3824 // we return OS_OK indicating we awoke via unpark().
3825 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
3826 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
3827 }
3829 void os::PlatformEvent::park () {
3830 guarantee (_ParkHandle != NULL, "Invariant") ;
3831 // Invariant: Only the thread associated with the Event/PlatformEvent
3832 // may call park().
3833 int v ;
3834 for (;;) {
3835 v = _Event ;
3836 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
3837 }
3838 guarantee ((v == 0) || (v == 1), "invariant") ;
3839 if (v != 0) return ;
3841 // Do this the hard way by blocking ...
3842 // TODO: consider a brief spin here, gated on the success of recent
3843 // spin attempts by this thread.
3844 while (_Event < 0) {
3845 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
3846 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
3847 }
3849 // Usually we'll find _Event == 0 at this point, but as
3850 // an optional optimization we clear it, just in case can
3851 // multiple unpark() operations drove _Event up to 1.
3852 _Event = 0 ;
3853 OrderAccess::fence() ;
3854 guarantee (_Event >= 0, "invariant") ;
3855 }
3857 void os::PlatformEvent::unpark() {
3858 guarantee (_ParkHandle != NULL, "Invariant") ;
3859 int v ;
3860 for (;;) {
3861 v = _Event ; // Increment _Event if it's < 1.
3862 if (v > 0) {
3863 // If it's already signaled just return.
3864 // The LD of _Event could have reordered or be satisfied
3865 // by a read-aside from this processor's write buffer.
3866 // To avoid problems execute a barrier and then
3867 // ratify the value. A degenerate CAS() would also work.
3868 // Viz., CAS (v+0, &_Event, v) == v).
3869 OrderAccess::fence() ;
3870 if (_Event == v) return ;
3871 continue ;
3872 }
3873 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
3874 }
3875 if (v < 0) {
3876 ::SetEvent (_ParkHandle) ;
3877 }
3878 }
3881 // JSR166
3882 // -------------------------------------------------------
3884 /*
3885 * The Windows implementation of Park is very straightforward: Basic
3886 * operations on Win32 Events turn out to have the right semantics to
3887 * use them directly. We opportunistically resuse the event inherited
3888 * from Monitor.
3889 */
3892 void Parker::park(bool isAbsolute, jlong time) {
3893 guarantee (_ParkEvent != NULL, "invariant") ;
3894 // First, demultiplex/decode time arguments
3895 if (time < 0) { // don't wait
3896 return;
3897 }
3898 else if (time == 0) {
3899 time = INFINITE;
3900 }
3901 else if (isAbsolute) {
3902 time -= os::javaTimeMillis(); // convert to relative time
3903 if (time <= 0) // already elapsed
3904 return;
3905 }
3906 else { // relative
3907 time /= 1000000; // Must coarsen from nanos to millis
3908 if (time == 0) // Wait for the minimal time unit if zero
3909 time = 1;
3910 }
3912 JavaThread* thread = (JavaThread*)(Thread::current());
3913 assert(thread->is_Java_thread(), "Must be JavaThread");
3914 JavaThread *jt = (JavaThread *)thread;
3916 // Don't wait if interrupted or already triggered
3917 if (Thread::is_interrupted(thread, false) ||
3918 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
3919 ResetEvent(_ParkEvent);
3920 return;
3921 }
3922 else {
3923 ThreadBlockInVM tbivm(jt);
3924 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3925 jt->set_suspend_equivalent();
3927 WaitForSingleObject(_ParkEvent, time);
3928 ResetEvent(_ParkEvent);
3930 // If externally suspended while waiting, re-suspend
3931 if (jt->handle_special_suspend_equivalent_condition()) {
3932 jt->java_suspend_self();
3933 }
3934 }
3935 }
3937 void Parker::unpark() {
3938 guarantee (_ParkEvent != NULL, "invariant") ;
3939 SetEvent(_ParkEvent);
3940 }
3942 // Run the specified command in a separate process. Return its exit value,
3943 // or -1 on failure (e.g. can't create a new process).
3944 int os::fork_and_exec(char* cmd) {
3945 STARTUPINFO si;
3946 PROCESS_INFORMATION pi;
3948 memset(&si, 0, sizeof(si));
3949 si.cb = sizeof(si);
3950 memset(&pi, 0, sizeof(pi));
3951 BOOL rslt = CreateProcess(NULL, // executable name - use command line
3952 cmd, // command line
3953 NULL, // process security attribute
3954 NULL, // thread security attribute
3955 TRUE, // inherits system handles
3956 0, // no creation flags
3957 NULL, // use parent's environment block
3958 NULL, // use parent's starting directory
3959 &si, // (in) startup information
3960 &pi); // (out) process information
3962 if (rslt) {
3963 // Wait until child process exits.
3964 WaitForSingleObject(pi.hProcess, INFINITE);
3966 DWORD exit_code;
3967 GetExitCodeProcess(pi.hProcess, &exit_code);
3969 // Close process and thread handles.
3970 CloseHandle(pi.hProcess);
3971 CloseHandle(pi.hThread);
3973 return (int)exit_code;
3974 } else {
3975 return -1;
3976 }
3977 }
3979 //--------------------------------------------------------------------------------------------------
3980 // Non-product code
3982 static int mallocDebugIntervalCounter = 0;
3983 static int mallocDebugCounter = 0;
3984 bool os::check_heap(bool force) {
3985 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
3986 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
3987 // Note: HeapValidate executes two hardware breakpoints when it finds something
3988 // wrong; at these points, eax contains the address of the offending block (I think).
3989 // To get to the exlicit error message(s) below, just continue twice.
3990 HANDLE heap = GetProcessHeap();
3991 { HeapLock(heap);
3992 PROCESS_HEAP_ENTRY phe;
3993 phe.lpData = NULL;
3994 while (HeapWalk(heap, &phe) != 0) {
3995 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
3996 !HeapValidate(heap, 0, phe.lpData)) {
3997 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
3998 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
3999 fatal("corrupted C heap");
4000 }
4001 }
4002 int err = GetLastError();
4003 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
4004 fatal1("heap walk aborted with error %d", err);
4005 }
4006 HeapUnlock(heap);
4007 }
4008 mallocDebugIntervalCounter = 0;
4009 }
4010 return true;
4011 }
4014 #ifndef PRODUCT
4015 bool os::find(address addr) {
4016 // Nothing yet
4017 return false;
4018 }
4019 #endif
4021 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
4022 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
4024 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
4025 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
4026 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
4027 address addr = (address) exceptionRecord->ExceptionInformation[1];
4029 if (os::is_memory_serialize_page(thread, addr))
4030 return EXCEPTION_CONTINUE_EXECUTION;
4031 }
4033 return EXCEPTION_CONTINUE_SEARCH;
4034 }
4036 static int getLastErrorString(char *buf, size_t len)
4037 {
4038 long errval;
4040 if ((errval = GetLastError()) != 0)
4041 {
4042 /* DOS error */
4043 size_t n = (size_t)FormatMessage(
4044 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
4045 NULL,
4046 errval,
4047 0,
4048 buf,
4049 (DWORD)len,
4050 NULL);
4051 if (n > 3) {
4052 /* Drop final '.', CR, LF */
4053 if (buf[n - 1] == '\n') n--;
4054 if (buf[n - 1] == '\r') n--;
4055 if (buf[n - 1] == '.') n--;
4056 buf[n] = '\0';
4057 }
4058 return (int)n;
4059 }
4061 if (errno != 0)
4062 {
4063 /* C runtime error that has no corresponding DOS error code */
4064 const char *s = strerror(errno);
4065 size_t n = strlen(s);
4066 if (n >= len) n = len - 1;
4067 strncpy(buf, s, n);
4068 buf[n] = '\0';
4069 return (int)n;
4070 }
4071 return 0;
4072 }